Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F214/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen
  • C08F214/18—Monomers containing fluorine
  • C08F214/184—Monomers containing fluorine with fluorinated vinyl ethers
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F14/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen
  • C08F14/18—Monomers containing fluorine
  • C08F14/22—Vinylidene fluoride
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F14/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen
  • C08F14/18—Monomers containing fluorine
  • C08F14/26—Tetrafluoroethene
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F2/00—Processes of polymerisation
  • C08F2/44—Polymerisation in the presence of compounding ingredients, e.g. plasticisers, dyestuffs, fillers
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F214/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen
  • C08F214/18—Monomers containing fluorine
  • C08F214/22—Vinylidene fluoride
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F214/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen
  • C08F214/18—Monomers containing fluorine
  • C08F214/26—Tetrafluoroethene
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F259/00—Macromolecular compounds obtained by polymerising monomers on to polymers of halogen containing monomers as defined in group C08F14/00
  • C08F259/08—Macromolecular compounds obtained by polymerising monomers on to polymers of halogen containing monomers as defined in group C08F14/00 on to polymers containing fluorine
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
  • C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
  • C08L27/12—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
  • C08L27/16—Homopolymers or copolymers or vinylidene fluoride
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
  • C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
  • C08L27/12—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
  • C08L27/18—Homopolymers or copolymers or tetrafluoroethene
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F116/00—Homopolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical
  • C08F116/12—Homopolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical by an ether radical
  • C08F116/14—Monomers containing only one unsaturated aliphatic radical
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F214/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen
  • C08F214/18—Monomers containing fluorine
  • C08F214/26—Tetrafluoroethene
  • C08F214/262—Tetrafluoroethene with fluorinated vinyl ethers
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2205/00—Polymer mixtures characterised by other features
  • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2205/00—Polymer mixtures characterised by other features
  • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
  • C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure

Definitions

• the present disclosure relates to methods and compositions for producing fluoropolymers.
• Patent Document 1 describes that by polymerizing a fluoromonomer in an aqueous medium in the presence of a polymer (1) containing a polymerized unit (1) based on a monomer represented by the following general formula (1), A method for making a fluoropolymer is described that includes the steps of obtaining the fluoropolymer.
• CX 2 CY(-CZ 2 -O-Rf-A) (1)
• X is the same or different and is -H or -F
• Y is -H, -F, an alkyl group or a fluorine-containing alkyl group
• Z is the same or different and is -H
• - F is an alkyl group or a fluoroalkyl group.
• Rf is a fluorine-containing alkylene group having 1 to 40 carbon atoms, or a fluorine-containing alkylene group having an ether bond having 2 to 100 carbon atoms.
• A is -COOM, - SO 3 M or -OSO 3 M (M is -H, a metal atom, -NR 7 4 , imidazolium which may have a substituent, pyridinium which may have a substituent, or a substituent)
• R7 is H or an organic group.However, at least one of X, Y and Z contains a fluorine atom.)
• Patent Document 2 describes a method for producing a fluoropolymer in which a fluoropolymer is obtained by polymerizing a fluoromonomer in an aqueous medium in the presence of a polymer (1), wherein the polymer (1) has the general formula A polymer of monomer (1) represented by (1), wherein the content of dimer and trimer of monomer (1) is 1.0 mass with respect to polymer (1). % or less is described.
• CF 2 CF-R-CZ 1 Z 2 -A 0 (1) (In the formula, R is a linking group, Z 1 and Z 2 are each independently F or CF 3 , and A 0 is an anionic group.)
• the present disclosure aims to provide a method for producing a fluoropolymer using a polymer that is rapidly decomposed at high temperatures and is difficult to remain in the fluoropolymer.
• a method for producing a fluoropolymer in which a fluoropolymer is obtained by polymerizing a fluoromonomer in an aqueous medium in the presence of a polymer (I), wherein the polymer (I) has the general formula A production method containing a polymerized unit (I) based on the monomer (I) represented by (I) and a polymerized unit (II) based on the monomer (II) represented by the formula (II) provided.
• CX 1 X 3 CX 2 R(-CZ 1 Z 2 -A 0 ) m (I)
• X 1 and X 3 are each independently F, Cl, H or CF 3
• X 2 is H, F, an alkyl group or a fluorine-containing alkyl group
• a 0 is an anion
• R is a linking group
• Z 1 and Z 2 are each independently H, F, an alkyl group, or a fluorine-containing alkyl group
• m is an integer of 1 or more.
• CHF CHF (II)
• the content of the polymerized unit (I) in the polymer (I) is 20 to 99 mol% with respect to the total polymerized units constituting the polymer (I), and the polymerized unit ( The content of II) is preferably 80 to 1 mol% based on the total polymerized units constituting the polymer (I).
• the content of dimer and trimer of monomer (I) in polymer (I) is preferably 1.0% by mass or less with respect to polymer (I).
• the content of dimer and trimer composed of monomer (I) and monomer (II) in polymer (I) is 1. It is preferably 0% by mass or less.
• a 0 is -SO 3 M or -COOM
• M is H, a metal atom, NR 7 4 , imidazolium which may have a substituent
• R 7 is preferably pyridinium or phosphonium which may have a substituent
• R 7 is H or an organic group.
• Mw weight average molecular weight of the polymer (I)
• Mw weight average molecular weight of the polymer (I)
• the ion exchange capacity of the polymer (I) is 0.8 meq/g or more.
• the ion exchange rate (IXR) of the polymer (I) is preferably 43 or less.
• the fluoropolymer is polytetrafluoroethylene.
• the fluoropolymer is fluororubber.
• composition containing a polymer (I) and a fluoropolymer wherein the polymer (I) is a polymer based on a monomer (I) represented by the general formula (I).
• a composition containing a unit (I) and a polymerized unit (II) based on a monomer (II) represented by general formula (II) is provided.
• CX 1 X 3 CX 2 R(-CZ 1 Z 2 -A 0 ) m (I)
• X 1 and X 3 are each independently F, Cl, H or CF 3
• X 2 is H, F, an alkyl group or a fluorine-containing alkyl group
• a 0 is an anion
• R is a linking group
• Z 1 and Z 2 are each independently H, F, an alkyl group, or a fluorine-containing alkyl group
• m is an integer of 1 or more.
• CHF CHF (II)
• the fluoropolymer is polytetrafluoroethylene.
• the fluoropolymer is preferably a fluororubber.
• FIG. 1 is a graph showing a curve representing the change in heater temperature with respect to time in the TG-DTA analysis performed in Preparation Example 1, and a TG curve obtained in the TG-DTA analysis.
• the fluororesin is a partially crystalline fluoropolymer and is a fluoroplastic.
• the fluororesin has a melting point and is thermoplastic, but may be melt processable or non-melt processable.
• melt processability means that the polymer can be melted and processed using conventional processing equipment such as extruders and injection molding machines. Therefore, melt-processable fluororesins usually have a melt flow rate of 0.01 to 500 g/10 minutes as measured by the measuring method described below.
• fluororubber is an amorphous fluoropolymer.
• “Amorphous” refers to the melting peak ( ⁇ H ) is 4.5 J/g or less.
• Fluororubber exhibits elastomer properties by crosslinking. By elastomeric properties is meant the property of allowing a polymer to be stretched and to retain its original length when the force required to stretch the polymer is no longer applied.
• partially fluorinated rubber refers to a fluoropolymer containing fluoromonomer units, with a content of perfluoromonomer units of less than 90 mol% based on the total polymerized units, and having a glass transition temperature of 20°C or less. , a fluoropolymer having a melting peak ( ⁇ H) magnitude of 4.5 J/g or less.
• perfluororubber is a fluoropolymer in which the content of perfluoromonomer units based on the total polymerized units is 90 mol% or more, preferably 91 mol% or more, and the glass is heated to 20°C or less.
• the concentration of fluorine atoms contained in the fluoropolymer is determined by calculating the concentration (% by mass) of fluorine atoms contained in the fluoropolymer from the type and content of each monomer constituting the fluoropolymer.
• a perfluoromonomer is a monomer that does not contain a carbon atom-hydrogen bond in its molecule.
• the perfluoromonomer may also be a monomer in which some of the fluorine atoms bonded to carbon atoms are replaced with chlorine atoms, and in addition to carbon atoms, nitrogen atoms and oxygen atoms. , a sulfur atom, a phosphorus atom, a boron atom, or a silicon atom.
• the perfluoromonomer is preferably a monomer in which all hydrogen atoms are replaced with fluorine atoms.
• the above perfluoromonomer does not include a monomer that provides a crosslinking site.
• the monomer that provides a crosslinking site is a monomer (cure site monomer) that has a crosslinking group that provides a fluoropolymer with a crosslinking site for forming crosslinks with a curing agent.
• polytetrafluoroethylene is preferably a fluoropolymer having a content of tetrafluoroethylene units of 99 mol% or more based on all polymerized units.
• both the fluororesin (excluding polytetrafluoroethylene) and the fluororubber are preferably fluoropolymers in which the content of tetrafluoroethylene relative to the total polymerized units is less than 99 mol%.
• the content of each monomer constituting the fluoropolymer can be calculated by appropriately combining NMR, FT-IR, elemental analysis, and fluorescent X-ray analysis depending on the type of monomer.
• organic group means a group containing one or more carbon atoms or a group formed by removing one hydrogen atom from an organic compound.
• Examples of the “organic group” are: an alkyl group that may have one or more substituents, Alkenyl group optionally having one or more substituents, an alkynyl group which may have one or more substituents, cycloalkyl group optionally having one or more substituents, Cycloalkenyl group optionally having one or more substituents, Cycloalkadienyl group optionally having one or more substituents, an aryl group which may have one or more substituents, an aralkyl group which may have one or more substituents, a non-aromatic heterocyclic group which may have one or more substituents, a heteroaryl group optionally having one or more substituents, cyano group, formyl group, RaO-, RaCO-, RaSO 2 ⁇ , RaCOO-, RaNRaCO-, RaCON
• substituteduent means a substitutable group.
• substitutable group examples include aliphatic groups, aromatic groups, heterocyclic groups, acyl groups, acyloxy groups, acylamino groups, aliphatic oxy groups, aromatic oxy groups, heterocyclic oxy groups, and aliphatic oxycarbonyl groups.
• the above aliphatic group may be saturated or unsaturated, and may also be a hydroxy group, an aliphatic oxy group, a carbamoyl group, an aliphatic oxycarbonyl group, an aliphatic thio group, an amino group, or an aliphatic amino group. , an acylamino group, a carbamoylamino group, etc.
• the aliphatic group include an alkyl group having a total of 1 to 8 carbon atoms, preferably 1 to 4 carbon atoms, such as a methyl group, an ethyl group, a vinyl group, a cyclohexyl group, and a carbamoylmethyl group.
• the above aromatic group includes, for example, a nitro group, a halogen atom, an aliphatic oxy group, a carbamoyl group, an aliphatic oxycarbonyl group, an aliphatic thio group, an amino group, an aliphatic amino group, an acylamino group, a carbamoylamino group, etc. You may do so.
• the above-mentioned aromatic group includes an aryl group having 6 to 12 carbon atoms, preferably 6 to 10 carbon atoms in total, such as a phenyl group, 4-nitrophenyl group, 4-acetylaminophenyl group, 4-methanesulfonylphenyl group. Examples include.
• the above heterocyclic group has a halogen atom, hydroxy group, aliphatic oxy group, carbamoyl group, aliphatic oxycarbonyl group, aliphatic thio group, amino group, aliphatic amino group, acylamino group, carbamoylamino group, etc. It's okay.
• Examples of the above-mentioned heterocyclic group include a 5- to 6-membered heterocycle having a total of 2 to 12 carbon atoms, preferably 2 to 10 carbon atoms, such as a 2-tetrahydrofuryl group and a 2-pyrimidyl group.
• the above acyl group includes an aliphatic carbonyl group, an arylcarbonyl group, a heterocyclic carbonyl group, a hydroxy group, a halogen atom, an aromatic group, an aliphatic oxy group, a carbamoyl group, an aliphatic oxycarbonyl group, an aliphatic thio group, and an amino group. , an aliphatic amino group, an acylamino group, a carbamoylamino group, etc.
• acyl group examples include acyl groups having a total of 2 to 8 carbon atoms, preferably 2 to 4 carbon atoms, such as an acetyl group, a propanoyl group, a benzoyl group, and a 3-pyridinecarbonyl group.
• the above acylamino group may have an aliphatic group, an aromatic group, a heterocyclic group, etc., and includes, for example, an acetylamino group, a benzoylamino group, a 2-pyridinecarbonylamino group, a propanoylamino group, etc. You can leave it there.
• the above-mentioned acylamino group includes an acylamino group having a total of 2 to 12 carbon atoms, preferably 2 to 8 carbon atoms, an alkylcarbonylamino group having a total of 2 to 8 carbon atoms, such as an acetylamino group, a benzoylamino group, and a 2-pyridinecarbonylamino group. group, propanoylamino group, etc.
• the aliphatic oxycarbonyl group may be saturated or unsaturated, and may also be a hydroxy group, an aliphatic oxy group, a carbamoyl group, an aliphatic oxycarbonyl group, an aliphatic thio group, an amino group, an aliphatic oxycarbonyl group, or an aliphatic oxycarbonyl group. It may have an amino group, an acylamino group, a carbamoylamino group, etc.
• Examples of the aliphatic oxycarbonyl group include alkoxycarbonyl groups having a total of 2 to 8 carbon atoms, preferably 2 to 4 carbon atoms, such as a methoxycarbonyl group, an ethoxycarbonyl group, and a (t)-butoxycarbonyl group.
• the above carbamoyl group may have an aliphatic group, an aromatic group, a heterocyclic group, etc.
• the above-mentioned carbamoyl group includes an unsubstituted carbamoyl group, an alkylcarbamoyl group having a total of 2 to 9 carbon atoms, preferably an unsubstituted carbamoyl group, an alkylcarbamoyl group having a total of 2 to 5 carbon atoms, such as an N-methylcarbamoyl group, Examples include N,N-dimethylcarbamoyl group and N-phenylcarbamoyl group.
• the aliphatic sulfonyl group may be saturated or unsaturated, and may also be a hydroxy group, aromatic group, aliphatic oxy group, carbamoyl group, aliphatic oxycarbonyl group, aliphatic thio group, or amino group. , an aliphatic amino group, an acylamino group, a carbamoylamino group, etc.
• Examples of the aliphatic sulfonyl group include alkylsulfonyl groups having a total of 1 to 6 carbon atoms, preferably 1 to 4 carbon atoms, such as a methanesulfonyl group.
• the above aromatic sulfonyl group includes a hydroxy group, an aliphatic group, an aliphatic oxy group, a carbamoyl group, an aliphatic oxycarbonyl group, an aliphatic thio group, an amino group, an aliphatic amino group, an acylamino group, a carbamoylamino group, etc. You may do so.
• Examples of the aromatic sulfonyl group include arylsulfonyl groups having 6 to 10 carbon atoms in total, such as benzenesulfonyl groups.
• the above amino group may have an aliphatic group, an aromatic group, a heterocyclic group, etc.
• the above acylamino group may have, for example, an acetylamino group, a benzoylamino group, a 2-pyridinecarbonylamino group, a propanoylamino group, or the like.
• the above-mentioned acylamino group includes an acylamino group having a total of 2 to 12 carbon atoms, preferably a total of 2 to 8 carbon atoms, more preferably an alkylcarbonylamino group having a total of 2 to 8 carbon atoms, such as an acetylamino group, a benzoylamino group, and a benzoylamino group. group, 2-pyridinecarbonylamino group, propanoylamino group, etc.
• the aliphatic sulfonamide group, aromatic sulfonamide group, and heterocyclic sulfonamide group may be, for example, a methanesulfonamide group, a benzenesulfonamide group, a 2-pyridine sulfonamide group, or the like.
• the sulfamoyl group may have an aliphatic group, an aromatic group, a heterocyclic group, etc.
• the above-mentioned sulfamoyl group includes a sulfamoyl group, an alkylsulfamoyl group having a total of 1 to 9 carbon atoms, a dialkylsulfamoyl group having a total of 2 to 10 carbon atoms, and an arylsulfamoyl group having a total of 7 to 13 carbon atoms.
• a heterocyclic sulfamoyl group having a total of 2 to 12 carbon atoms more preferably a sulfamoyl group, an alkylsulfamoyl group having a total of 1 to 7 carbon atoms, a dialkylsulfamoyl group having a total of 3 to 6 carbon atoms, a total carbon Arylsulfamoyl group having 6 to 11 atoms, heterocyclic sulfamoyl group having 2 to 10 total carbon atoms, such as sulfamoyl group, methylsulfamoyl group, N,N-dimethylsulfamoyl group, phenylsulfamoyl group group, 4-pyridine sulfamoyl group, and the like.
• the above aliphatic oxy group may be saturated or unsaturated, and may also have a methoxy group, ethoxy group, i-propyloxy group, cyclohexyloxy group, methoxyethoxy group, etc.
• Examples of the aliphatic oxy group include alkoxy groups having a total of 1 to 8 carbon atoms, preferably 1 to 6 carbon atoms, such as methoxy, ethoxy, i-propyloxy, cyclohexyloxy, and methoxyethoxy groups.
• the above aromatic amino group and heterocyclic amino group are an aliphatic group, an aliphatic oxy group, a halogen atom, a carbamoyl group, a heterocyclic group condensed with the aryl group, an aliphatic oxycarbonyl group, preferably a total number of carbon atoms.
• the aliphatic thio group may be saturated or unsaturated, and may be an alkylthio group having a total number of carbon atoms of 1 to 8, more preferably 1 to 6, such as a methylthio group or an ethylthio group. , carbamoylmethylthio group, t-butylthio group, etc.
• the above carbamoylamino group may have an aliphatic group, an aryl group, a heterocyclic group, etc.
• the above carbamoylamino group includes a carbamoylamino group, an alkylcarbamoylamino group having a total of 2 to 9 carbon atoms, a dialkylcarbamoylamino group having a total of 3 to 10 carbon atoms, an arylcarbamoylamino group having a total of 7 to 13 carbon atoms, A heterocyclic carbamoylamino group having a total number of carbon atoms of 3 to 12, preferably a carbamoylamino group, an alkylcarbamoylamino group having a total of 2 to 7 carbon atoms, a dialkylcarbamoylamino group having a total of 3 to 6 carbon atoms, a total number of carbon atoms Arylcarbamoylamino group having 7 to 11 carbon
• ranges represented by endpoints include all numbers subsumed within that range (e.g., 1 to 10 includes 1.4, 1.9, 2.33, 5.75, 9 .98 etc.).
• the expression "at least 1" includes all numerical values greater than or equal to 1 (for example, at least 2, at least 4, at least 6, at least 8, at least 10, at least 25, at least 50, at least 100, etc.) .
• the production method of the present disclosure is a fluoropolymer production method in which a fluoropolymer is obtained by polymerizing a fluoromonomer in an aqueous medium in the presence of polymer (I).
• the polymer (I) includes a polymer unit (I) based on the monomer (I) represented by the general formula (I), and a polymer unit (I) based on the monomer (II) represented by the formula (II). It is a polymer containing (II).
• polymer (I) has the property of being rapidly decomposed when heated above its decomposition temperature. Since the production method of the present disclosure involves polymerizing the fluoromonomer in the presence of the polymer (I), the polymer (I) remains in the obtained fluoropolymer. By heating, the polymer (I) in the fluoropolymer is rapidly decomposed, and a highly pure fluoropolymer can be obtained. That is, according to the production method of the present disclosure, a highly pure fluoropolymer can be produced extremely easily.
• Polymer (I) contains polymerized units (I) and polymerized units (II).
• the polymerized unit (I) is a polymerized unit based on the monomer (I) represented by the general formula (I).
• CX 1 X 3 CX 2 R(-CZ 1 Z 2 -A 0 ) m (I)
• X 1 and X 3 are each independently F, Cl, H or CF 3
• X 2 is H, F, an alkyl group or a fluorine-containing alkyl group
• a 0 is an anion
• R is a linking group
• Z 1 and Z 2 are each independently H, F, an alkyl group, or a fluorine-containing alkyl group
• m is an integer of 1 or more.
• polymerized unit (II) is a polymerized unit based on the monomer (II) represented by the formula (II).
• CHF CHF (II)
• anionic groups include anionic groups such as sulfate groups and carboxylate groups, as well as functional groups that provide anionic groups such as acid groups such as -COOH and acid bases such as -COONH4 .
• anionic group include a sulfate group, a carboxylate group, a phosphate group, a phosphonate group, a sulfonate group, or -C(CF 3 ) 2 OM (wherein M is -H, a metal atom, -NR 7 4 , Imidazolium which may have a substituent, pyridinium which may have a substituent or phosphonium which may have a substituent, and R 7 is H or an organic group) is preferred. .
• the polymer (I) can contain one or more monomers as the monomer (I) represented by the general formula (I).
• R is a linking group.
• a "linking group” is a (m+1)-valent linking group, and when m is 1, it is a divalent linking group.
• the linking group may be a single bond and preferably contains at least one carbon atom, and the number of carbon atoms may be 2 or more, 4 or more, or 8 or more. , may be 10 or more, or may be 20 or more.
• the upper limit is not limited, but may be, for example, 100 or less, or 50 or less.
• the linking group may be linear or branched, cyclic or acyclic structure, saturated or unsaturated, substituted or unsubstituted, optionally containing one or more members selected from the group consisting of sulfur, oxygen, and nitrogen. It may contain heteroatoms and optionally one or more functional groups selected from the group consisting of esters, amides, sulfonamides, carbonyls, carbonates, urethanes, ureas and carbamates.
• the linking group does not contain a carbon atom and may be a catenary heteroatom such as oxygen, sulfur or nitrogen.
• n is an integer of 1 or more, preferably 1 or 2, more preferably 1.
• Z 1 , Z 2 and A 0 may be the same or different.
• R is preferably a catenary heteroatom such as oxygen, sulfur, or nitrogen, or a divalent organic group.
• R When R is a divalent organic group, the hydrogen atom bonded to the carbon atom may be replaced with a halogen other than fluorine, such as chlorine, and may or may not contain a double bond. Further, R may be either chain or branched, and may be cyclic or acyclic. Further, R may include a functional group (eg, ester, ether, ketone (keto group), amine, halide, etc.).
• a functional group eg, ester, ether, ketone (keto group), amine, halide, etc.
• R may also be a non-fluorine divalent organic group, or a partially fluorinated or perfluorinated divalent organic group.
• R is, for example, a hydrocarbon group in which a fluorine atom is not bonded to a carbon atom, a hydrocarbon group in which some of the hydrogen atoms bonded to a carbon atom are replaced with a fluorine atom, or a hydrogen atom bonded to a carbon atom. All of them may be hydrocarbon groups substituted with fluorine atoms, and these may contain oxygen atoms, double bonds, or functional groups.
• R is preferably a hydrocarbon group having 1 to 100 carbon atoms which may contain an ether bond or a keto group, and the hydrocarbon group is such that some or all of the hydrogen atoms bonded to carbon atoms are fluorine. May be replaced.
• R is preferably -(CH 2 ) a -, -(CF 2 ) a -, -(CF 2 ) a -O-, -O-(CF 2 ) a -, -(CF 2 ) a -O- (CF 2 ) b -, -O(CF 2 ) a -O-(CF 2 ) b -, -(CF 2 ) a -[O-(CF 2 ) b ] c -, -O(CF 2 ) a -[O-(CF 2 ) b ] c -, -[(CF 2 ) a -O] b -[(CF 2 ) c -O] d -, -O[(CF 2 ) a -O] b , -O[(CF 2 ) a -O] b , -O[(CF 2 ) a -O] b -[(
• a, b, c and d are independently at least 1 or more.
• a, b, c and d may independently be 2 or more, 3 or more, 4 or more, 10 or more, 20 or more.
• the upper limit of a, b, c and d is, for example, 100.
• R is more preferably -O-CF 2 -, -O- CF 2 CF 2 -, -O-CF 2 CF 2 -O-, -O-CF 2 CF 2 CF 2 -, -O-CF 2 CF 2 -O-, -O-CF 2 CF (CF 3 ) -O-, -O-CF 2 CF 2 -O-CF (CF 3 ) CF 2 -O-, -O-CF 2 CF (CF 3 ) At least one selected from -O-CF 2 CF 2 -O- and -O-CF 2 CF(CF 3 )-O-CF 2 -.
• R general formula (r1): -CF 2 -O-(CX 6 2 ) e - ⁇ O-CF(CF 3 ) ⁇ f -(O) g - (r1) (wherein each X 6 is independently H, F or CF 3 , e is an integer from 0 to 3, f is an integer from 0 to 3, and g is 0 or 1)
• a divalent group represented by the general formula (r2) is preferable, and has the general formula (r2): -CF 2 -O-(CX 7 2 ) e -(O) g - (r2)
• a divalent group represented by (wherein X 7 is each independently H, F or CF 3 , e is an integer from 0 to 3, and g is 0 or 1) is more preferred.
• R examples suitable for R include -CF 2 -O-, -CF 2 -O-CF 2 -, -CF 2 -O-CH 2 -, -CF 2 -O - CH 2 CF 2 - , -O -CF 2 -, -O-CF 2 CF 2 -, -O-CF 2 CF 2 CF 2 -, -O-CF 2 CF 2 CF 2 -, -O-CF 2 CF (CF 3 ) -O -CF 2 -, -O-CF 2 CF (CF 3 ) -O-CF 2 CF 2 -, -CF 2 -O-CF 2 CF 2 -, -CF 2 -O-CF 2 CH 2 -, -CF 2 -O-CF 2 CF 2 CH 2 -, -CF 2 -O-CF (CF 3 )-, -CF 2 -O-CF (CF 3 )CF 2 -, -CF 2 -O-CF 2 CH
• R is preferably a perfluoroalkylene group which may contain an oxygen atom, and specifically, -CF 2 -O-, -CF 2 -O-CF 2 -, -O-CF 2 -, - O-CF 2 CF 2 -, -O-CF 2 CF (CF 3 )-O-CF 2 -, -O-CF 2 CF (CF 3 )-O-CF 2 CF 2 -, -CF 2 -O- CF 2 CF 2 -, -CF 2 -O-CF(CF 3 )-, -CF 2 -O-CF(CF 3 )CF 2 -, or -CF 2 -O-CF(CF 3 )CF 2 - O- is preferred.
• -R-CZ 1 Z 2 - in general formula (I) is represented by general formula (s1): -CF 2 -O-(CX 6 2 ) e - ⁇ O-CF(CF 3 ) ⁇ f -(O) g -CZ 1 Z 2 - (s1) (wherein, X 6 is each independently H, F or CF 3 , e is an integer from 0 to 3, f is an integer from 0 to 3, g is 0 or 1, and Z 1 and Z 2 are each independently H, F, an alkyl group or a fluorine-containing alkyl group), and in formula (s1), Z 1 and Z 2 are F or CF 3 More preferably, one is F and the other is CF3 .
• -R-CZ 1 Z 2 - can be represented by general formula (s2): -CF 2 -O-(CX 7 2 ) e -(O) g -CZ 1 Z 2 - (s2) (wherein, X 7 is each independently H, F or CF 3 , e is an integer from 0 to 3, g is 0 or 1, and Z 1 and Z 2 are each independently, H, F, an alkyl group or a fluorine-containing alkyl group), and in formula (s2), Z 1 and Z 2 are more preferably F or CF 3 , one is F and the other is CF More preferably, it is 3 .
• -R-CZ 1 Z 2 - in general formula (I) includes -CF 2 -O-CF 2 -, -O-CF 2 CF 2 -, -O-CF 2 CF 2 CF 2 -, -O- CF 2 CF 2 CF 2 -, -O-CF 2 CF (CF 3 )-O-CF 2 -, -O-CF 2 CF (CF 3 )-O-CF 2 CF 2 -, -O-CF 2 CF(CF 3 )-O-CF 2 CF 2 CF 2 -, -CF 2 -O-CF(CF 3 )-, -CF 2 -O-CF(CF 3 )-, -CF 2 -O-C(CF 3 ) 2 -, -CF 2 -O- CF 2 -CF 2 -, -CF 2 -O-CF 2 -CF(CF 3 )-, -CF 2 -O-CF 2 -C(CF 3 ) 2
• the anionic group (A 0 ) is -SO 2 M, -SO 3 M, -OSO 3 M, -COOM, -SO 2 NR'CH 2 COOM, -CH 2 OP(O)(OM) 2 , [- CH2O ] 2P (O)(OM), -CH2CH2OP (O ) (OM) 2 , [-CH2CH2O] 2P ( O ) (OM ) , -CH2CH2OSO 3 M, -P(O)(OM) 2 , -SO 2 NR'CH 2 CH 2 OP(O)(OM) 2 , [-SO 2 NR'CH 2 CH 2 O] 2 P(O)(OM ), -CH 2 OSO 3 M, -SO 2 NR'CH 2 CH 2 OSO 3 M, or -C(CF 3 ) 2 OM.
• -SO 3 M, -OSO 3 M, -COOM, -P(O)(OM) 2 or -C(CF 3 ) 2 OM are preferred, and -COOM, -SO 3 M, -OSO 3 M, -P(O)(OM) 2 or -C(CF 3 ) 2 OM is more preferred, -SO 3 M, -COOM or -P(O)(OM) 2 is even more preferred, -SO 3 M or -COOM is particularly preferred.
• M is H, a metal atom, NR 7 4 , imidazolium which may have a substituent, pyridinium which may have a substituent, or phosphonium which may have a substituent, and R 7 is H or an organic group.
• metal atom examples include alkali metals (Group 1), alkaline earth metals (Group 2), and Na, K, or Li are preferred.
• M is preferably -H, a metal atom or NR 7 4 , more preferably -H, an alkali metal (group 1), an alkaline earth metal (group 2) or NR 7 4 , -H, -Na, -K , -Li or NH 4 are even more preferred, -H, -Na, -K or NH 4 are even more preferred, and -H, -Na or NH 4 are particularly preferred.
• each polymerized unit (I) may have different anionic groups or the same anionic group.
• monomer (I) is a monomer represented by general formula (Ia). It is also preferable that the polymer (I) is a polymer containing a polymerized unit (Ia) based on a monomer represented by the general formula (Ia).
• CF 2 CF-O-Rf 0 -A 0 (Ia)
• a 0 is an anionic group
• Rf 0 is perfluorinated, linear or branched, cyclic or acyclic structure, saturated or unsaturated, substituted or unsubstituted
• a perfluorinated divalent linking group optionally containing one or more heteroatoms selected from the group consisting of sulfur, oxygen, and nitrogen).
• monomer (I) is a monomer represented by general formula (Ib). It is also preferable that the polymer (I) is a polymer containing a polymerized unit (Ib) based on a monomer represented by the general formula (Ib).
• CH 2 CH-O-Rf 0 -A 0 (Ib) (wherein A 0 is an anionic group and Rf 0 is a perfluorinated divalent linking group as defined by Formula Ia.)
• a 0 is a sulfate group.
• a 0 is, for example, -CH 2 OSO 3 M, -CH 2 CH 2 OSO 3 M, or -SO 2 NR'CH 2 CH 2 OSO 3 M, where R' is H or the number of carbon atoms It is an alkyl group of 1 to 4, and M is the same as above.
• a 0 is a sulfonate group.
• a 0 is, for example, -SO 3 M, where M is the same as above.
• M is the same as above.
• a 0 is a carboxylate group.
• a 0 is, for example, COOM or SO 2 NR'CH 2 COOM, where R' is H or an alkyl group having 1 to 4 carbon atoms, and M is the same as above.
• a 0 is a phosphate group.
• a 0 include -CH 2 OP(O)(OM) 2 , [-CH 2 O] 2 P(O)(OM), -CH 2 CH 2 OP(O)(OM) 2 , [- CH2CH2O ] 2P (O ) (OM), [ -SO2NR'CH2CH2O ] 2P (O) ( OM ) or SO2NR'CH2CH2OP ( O)(OM ) 2
• R' is an alkyl group having 1 to 4 carbon atoms
• M is the same as above.
• a 0 is a phosphonate group.
• Monomer (I) is preferably monomer (1) represented by general formula (1).
• the polymer (I) is preferably a polymer (1) containing, as the polymer unit (I), a polymer unit (1) based on the monomer (1) represented by the general formula (1).
• CX 2 CY(-CZ 2 -O-Rf-A) (1) (In the formula, X is the same or different and is H or F, Y is H, F, an alkyl group or a fluorine-containing alkyl group, and Z is the same or different and is H, F, an alkyl group or a fluorine-containing alkyl group.
• Rf is a fluorine-containing alkylene group having 1 to 40 carbon atoms or a fluorine-containing alkylene group having an ether bond and having 2 to 100 carbon atoms.
• A is -COOM, -SO 3 M, -OSO 3 M or -C(CF 3 ) 2 OM (M is H, a metal atom, NR 7 4 , imidazolium which may have a substituent, pyridinium which may have a substituent, or a substituent)
• R7 is H or an organic group.However, at least one of X, Y and Z contains a fluorine atom.)
• the above-mentioned fluorine-containing alkylene group having 2 to 100 carbon atoms and having an ether bond is an alkylene group that does not have a structure in which an oxygen atom is the terminal, but contains an ether bond between carbon atoms.
• X is H or F. Both of X may be F, or at least one of them may be H. For example, one may be F and the other H, or both may be H.
• Y is H, F, an alkyl group, or a fluorine-containing alkyl group.
• the above-mentioned alkyl group is an alkyl group that does not contain a fluorine atom, and the number of carbon atoms may be 1 or more.
• the number of carbon atoms in the alkyl group is preferably 6 or less, more preferably 4 or less, and even more preferably 3 or less.
• the above-mentioned fluorine-containing alkyl group is an alkyl group containing at least one fluorine atom, and the number of carbon atoms may be 1 or more.
• the number of carbon atoms in the fluorine-containing alkyl group is preferably 6 or less, more preferably 4 or less, and even more preferably 3 or less.
• the above Y is preferably H, F or CF3 , and more preferably F.
• Z's are the same or different and are H, F, an alkyl group or a fluoroalkyl group.
• the above alkyl group is an alkyl group that does not contain a fluorine atom, and the number of carbon atoms may be 1 or more.
• the number of carbon atoms in the alkyl group is preferably 6 or less, more preferably 4 or less, and even more preferably 3 or less.
• the above-mentioned fluorine-containing alkyl group is an alkyl group containing at least one fluorine atom, and the number of carbon atoms may be 1 or more.
• the number of carbon atoms in the fluorine-containing alkyl group is preferably 6 or less, more preferably 4 or less, and even more preferably 3 or less.
• the above Z is preferably H, F or CF3 , and more preferably F.
• At least one of the above X, Y and Z contains a fluorine atom.
• X may be H and Y and Z may be F.
• Rf is a fluorine-containing alkylene group having 1 to 40 carbon atoms, or a fluorine-containing alkylene group having 2 to 100 carbon atoms and having an ether bond.
• the number of carbon atoms in the fluorine-containing alkylene group is preferably 2 or more.
• the number of carbon atoms in the fluorine-containing alkylene group is preferably 30 or less, more preferably 20 or less, even more preferably 10 or less, particularly preferably 6 or less, and most preferably 3 or less.
• the above-mentioned fluorine-containing alkylene groups include -CF 2 - , -CH 2 CF 2 -, -CF 2 CF 2 -, -CF 2 CH 2 -, -CF 2 CF 2 CF 2 - , -CF 2 CF 2 CH 2 -, -CF(CF 3 )-, -CF(CF 3 )CF 2 -, -CF(CF 3 )CH 2 -, and the like.
• the fluorine-containing alkylene group is preferably a perfluoroalkylene group.
• the number of carbon atoms in the fluorine-containing alkylene group having an ether bond is preferably 3 or more.
• the number of carbon atoms in the fluorine-containing alkylene group having an ether bond is preferably 60 or less, more preferably 30 or less, even more preferably 12 or less, particularly preferably 9 or less, and most preferably 6 or less.
• the above-mentioned fluorine-containing alkylene group having an ether bond has the general formula: (In the formula, Z 1 is F or CF 3 ; Z 2 and Z 3 are each H or F; Z 4 is H, F or CF 3 ; p1+q1+r1 is an integer from 1 to 10; s1 is 0 or 1; t1 is 0 A divalent group represented by an integer of 5 to 5 is also preferable.
• the fluorine-containing alkylene group having an ether bond includes -CF 2 CF (CF 3 )OCF 2 CF 2 -, -CF (CF 3 )CF 2 -O-CF (CF 3 )-, -(CF (CF 3 )CF 2 -O) n -CF(CF 3 )- (in the formula, n is an integer from 1 to 10), -CF(CF 3 )CF 2 -O-CF(CF 3 )CH 2 -, -(CF(CF 3 )CF 2 -O) n -CF(CF 3 )CH 2 - (in the formula, n is an integer from 1 to 10), -CH 2 CF 2 CF 2 O-CH 2 CF 2 CH 2 -, -CF 2 CF 2 CF 2 O-CF 2 -, -CF 2 CF 2 CF 2 O-CF 2 CF 2 -, -CF 2 CF 2 CF 2 O-CF 2 CF 2 -, -CF 2 CF 2
• A is -COOM, -SO 3 M, -OSO 3 M or -C(CF 3 ) 2 OM
• M is H, a metal atom, NR 7 4 , or has a substituent.
• R 7 is preferably H or a C 1-10 organic group, more preferably H or a C 1-4 organic group, and even more preferably H or a C 1-4 alkyl group.
• metal atom examples include alkali metals (Group 1), alkaline earth metals (Group 2), and Na, K, or Li are preferred.
• M is preferably H, a metal atom or NR 7 4 , more preferably H, an alkali metal (group 1), an alkaline earth metal (group 2) or NR 7 4 , H, Na, K, Li or NH 4 are even more preferred, H, Na, K or NH4 are even more preferred, and H, Na or NH4 are particularly preferred.
• A is preferably -COOM or -SO 3 M.
• n5 is preferably 0 or an integer from 1 to 5, more preferably 0, 1 or 2, from the viewpoint of obtaining particles with a small primary particle diameter. or 1 is more preferable.
• Monomer (1) is preferably a monomer represented by general formula (1A).
• the polymerized unit (1) is preferably a polymerized unit (1A) based on a monomer represented by general formula (1A).
• CH 2 CF(-CF 2 -O-Rf-A) (1A) (In the formula, Rf and A are the same as above.)
• the monomer represented by formula (1A) has the general formula
• Z 1 is F or CF 3 ;
• Z 2 and Z 3 are each H or F;
• Z 4 is H, F or CF 3 ;
• p1+q1+r1 is an integer from 0 to 10;
• s1 is 0 or 1;
• t1 is 0
• monomers represented by an integer of ⁇ 5 provided that when Z 3 and Z 4 are both H, p1+q1+r1+s1 is not 0; A is the same as defined above). More specifically,
• examples of the monomer represented by general formula (1) include monomers represented by the following formula.
• CF 2 CFCF 2 -O-Rf-A (In the formula, Rf and A are the same as above)
• monomer (I) is monomer (2) represented by general formula (2). It is also preferable that the polymer (I) is a polymer (2) containing, as the polymer unit (I), a polymer unit (2) based on the monomer (2) represented by the general formula (2).
• CX 2 CY(-O-Rf-A) (2) (In the formula, X is the same or different and is H or F, Y is H, F, an alkyl group or a fluorine-containing alkyl group, and Rf is a fluorine-containing alkylene group having 1 to 40 carbon atoms, or a carbon It is a fluorine-containing alkylene group having several 2 to 100 ether bonds or keto groups.A is the same as above.)
• X is H or F. Both of X may be F, or at least one of them may be H. For example, one may be F and the other H, or both may be H.
• Y is H, F, an alkyl group, or a fluorine-containing alkyl group.
• the alkyl group is an alkyl group that does not contain a fluorine atom, and the number of carbon atoms may be 1 or more.
• the number of carbon atoms in the alkyl group is preferably 6 or less, more preferably 4 or less, and even more preferably 3 or less.
• the fluorine-containing alkyl group is an alkyl group containing at least one fluorine atom, and the number of carbon atoms may be 1 or more.
• the number of carbon atoms in the fluorine-containing alkyl group is preferably 6 or less, more preferably 4 or less, and even more preferably 3 or less.
• As Y, H, F or CF3 is preferable, and F is more preferable.
• At least one of the above X and Y preferably contains a fluorine atom.
• X may be H and Y and Z may be F.
• Rf is a fluorine-containing alkylene group having 1 to 40 carbon atoms, a fluorine-containing alkylene group having an ether bond having 2 to 100 carbon atoms, or a fluorine-containing alkylene group having a keto group having 2 to 100 carbon atoms. It is an alkylene group. Note that the above-mentioned fluorine-containing alkylene group having an ether bond having 2 to 100 carbon atoms is an alkylene group that does not include a structure in which an oxygen atom is the terminal, but includes an ether bond between carbon atoms.
• the number of carbon atoms in the fluorine-containing alkylene group of Rf is preferably 2 or more. Further, it is preferably 30 or less, more preferably 20 or less, even more preferably 10 or less, and particularly preferably 5 or less.
• Examples of the fluorine-containing alkylene group include -CF 2 -, -CH 2 CF 2 -, -CF 2 CF 2 -, -CF 2 CH 2 -, -CF 2 CF 2 CH 2 -, -CF(CF 3 )-, -CF(CF 3 )CF 2 -, -CF(CF 3 )CH 2 -, -CF 2 CF 2 CF 2 -, CF 2 CF 2 CF 2 CF 2 - and the like.
• the fluorine-containing alkylene group is preferably a perfluoroalkylene group, more preferably an unbranched linear perfluoroalkylene group.
• the number of carbon atoms in the fluorine-containing alkylene group having an ether bond is preferably 3 or more.
• the number of carbon atoms in the fluorine-containing alkylene group having an ether bond is preferably 60 or less, more preferably 30 or less, even more preferably 12 or less, and particularly preferably 5 or less.
• the above-mentioned fluorine-containing alkylene group having an ether bond has, for example, the general formula: (In the formula, Z 1 is F or CF 3 ; Z 2 and Z 3 are each H or F; Z 4 is H, F or CF 3 ; p1+q1+r1 is an integer from 1 to 10; s1 is 0 or 1; t1 is 0 A divalent group represented by an integer of 5 to 5 is also preferable.
• the fluorine-containing alkylene group having an ether bond includes -CF 2 CF (CF 3 ) OCF 2 -, -CF 2 CF (CF 3 ) OCF 2 CF 2 -, -CF 2 CF (CF 3 ) OCF 2 CF 2 CF 2 -, -CF(CF 3 )CF 2 -O-CF(CF 3 )-, -(CF(CF 3 )CF 2 -O) n -CF(CF 3 )- (wherein, n is an integer from 1 to 10), -CF(CF 3 )CF 2 -O-CF(CF 3 )CH 2 -, -(CF(CF 3 )CF 2 -O) n -CF(CF 3 )CH 2 - (In the formula, n is an integer from 1 to 10), -CH 2 CF 2 CF 2 O-CH 2 CF 2 CH 2 -, -CF 2 CF 2 CF 2 O-CF 2 -, -CF 2 CF (CF
• the number of carbon atoms in the fluorine-containing alkylene group having a keto group is preferably 3 or more.
• the number of carbon atoms in the fluorine-containing alkylene group having a keto group is preferably 60 or less, more preferably 30 or less, even more preferably 12 or less, and particularly preferably 5 or less.
• the above-mentioned fluorine-containing alkylene group having a keto group includes -CF 2 CF (CF 3 )CO-CF 2 -, -CF 2 CF (CF 3 )CO-CF 2 CF 2 -, -CF 2 CF ( CF 3 )CO—CF 2 CF 2 CF 2 —, —CF 2 CF (CF 3 )CO—CF 2 CF 2 CF 2 —, and the like.
• the fluorine-containing alkylene group having a keto group is preferably a perfluoroalkylene group.
• monomer (2) may be a hydrate.
• fluorine-containing alkylene group in which water is added to a keto group include -CF 2 CF (CF 3 )C(OH) 2 -CF 2 -, -CF 2 CF (CF 3 )C(OH) 2 -CF 2 CF 2 -, -CF 2 CF(CF 3 )C(OH) 2 -CF 2 CF 2 CF 2 -, -CF 2 CF(CF 3 )C(OH) 2 -CF 2 CF 2 CF 2 -, etc. It will be done.
• Monomers represented by general formula (2) are monomers represented by general formulas (2a), (2b), (2c), (2d), (2e), (2f) and (2g). At least one selected from the group consisting of is preferred.
• CF 2 CF-O-(CF 2 ) n1 -A (2a) (In the formula, n1 represents an integer from 1 to 10, and A is the same as above.)
• CF 2 CF-O-(CF 2 C(CF 3 )F) n2 -A (2b) (In the formula, n2 represents an integer from 1 to 5, and A is the same as defined above.)
• CF 2 CF-O-(CFX 1 ) n3 -A (2c) (In the formula, X 1 represents F or CF 3 , n3 represents an integer from 1 to 10, and A is the same as defined above.)
• CF 2 CF-O-(CF 2 CFX 1 O) n4 -(CF 2 ) n6 -A (2d) (In the formula,
• CF 2 CF[OCF 2 CF(CF 3 )] n9 O(CF 2 ) n10 O[CF(CF 3 )CF 2 O] n11 CF(CF 3 )-A (2g)
• n9 represents an integer from 0 to 5
• n10 represents an integer from 1 to 8
• n11 represents an integer from 0 to 5.
• A is the same as defined above.
• n1 is preferably an integer of 5 or less, more preferably an integer of 2 or less.
• n2 is preferably an integer of 3 or less in terms of dispersion stability of the resulting composition.
• n3 is preferably an integer of 5 or less in terms of water solubility
• the above A is preferably -COOM
• the above M is H, Na or NH 4 is preferred.
• X 1 is preferably -CF 3 from the viewpoint of dispersion stability of the composition
• n 4 is preferably an integer of 5 or less from the viewpoint of water solubility
• A is , -COOM
• M is preferably H, Na or NH4 .
• n5 is preferably an integer of 5 or less in terms of water solubility
• A is preferably -COOM
• M is preferably H or NH 4 .
• n7 is preferably an integer of 5 or less in terms of water solubility
• A is preferably -COOM or -SO 3 M, more preferably -COOM.
• M is H, Na, K or NH4 .
• n9 is preferably an integer of 3 or less in terms of water solubility
• n10 is preferably an integer of 3 or less
• n11 is preferably an integer of 3 or less
• A is preferably -COOM or -SO 3 M, more preferably -COOM.
• M is H, Na, K or NH4 .
• monomer (I) is monomer (3) represented by general formula (3). It is also preferable that the polymer (I) is a polymer (3) containing, as the polymer unit (I), a polymer unit (3) based on the monomer (3) represented by the general formula (3).
• CX 2 CY(-Rf-A) (3) (wherein, X is the same or different and is -H or F, Y is -H, -F, an alkyl group or a fluorine-containing alkyl group, Rf is a fluorine-containing alkylene group having 1 to 40 carbon atoms, Alternatively, it is a fluorine-containing alkylene group having 2 to 100 carbon atoms and having an ether bond. A is the same as above.)
• the fluorine-containing alkylene group having 2 to 100 carbon atoms and having an ether bond is an alkylene group that does not include a structure in which an oxygen atom is the terminal, but contains an ether bond between carbon atoms.
• Rf is preferably a fluorine-containing alkylene group having 1 to 40 carbon atoms. In general formula (3), it is preferable that at least one of X and Y contains a fluorine atom.
• A is preferably -SO 3 M or COOM
• M is H
• a metal atom NR 7 4
• imidazolium which may have a substituent
• a substituted Pyridinium which may have a group or phosphonium which may have a substituent is preferable.
• R 7 represents H or an organic group.
• n1 is preferably an integer of 5 or less, more preferably an integer of 2 or less.
• A is preferably -COOM and M is preferably H or NH4 .
• n2 is preferably an integer of 3 or less from the viewpoint of dispersion stability of the resulting composition
• A is preferably -COOM
• M is H or NH 4 It is preferable that
• monomer (I) is at least one selected from the group consisting of monomers represented by general formula (4a) and general formula (4b).
• Polymer (I) is a polymer containing a polymer unit (4) based on at least one monomer selected from the group consisting of monomers represented by general formula (4a) and general formula (4b). (4) is also preferable.
• CF 2 CF-CF 2 -O-Q F1 -CF(-Q F2 -CZ 1 Z 2 -A) 2 (4a)
• Q F1 and Q F2 are the same or different, a single bond, a fluorine-containing alkylene group which may contain an ether bond between carbon atoms, or a carbon It is a fluorine-containing oxyalkylene group that may contain an ether bond between carbon atoms
• CF 2 CF-O-Q F1 -CF(-Q F2 -CZ 1 Z 2 -A) 2 (4b) (In the formula, Z 1 , Z 2 , A, Q F1 and Q F2 are the same as defined above)
• Monomer (I) is preferably selected from the group consisting of monomer (1), monomer (2) and monomer (3), since it is possible to obtain polymer (I) with even better water solubility. At least one selected from the group consisting of monomer (1) and monomer (2) is preferable, at least one selected from the group consisting of monomer (1) and monomer (2) is more preferable, and monomer (2) is even more preferable. ) is even more preferred.
• the polymer (I) at least one selected from the group consisting of polymer (1), polymer (2), and polymer (3) is preferable because it can have better water solubility; At least one selected from the group consisting of (1) and polymer (2) is more preferred, and polymer (2) is even more preferred.
• the polymer (I) may be a copolymer consisting only of the polymerized unit (I) and the polymerized unit (II), or a copolymer consisting of the polymerized unit (I) and the polymerized unit (II), and the monomer (I). It may also be a copolymer containing monomer (II) and a polymerized unit based on another copolymerizable monomer.
• the polymerized units (I) may be the same or different in each occurrence, and the polymer (I) is a polymerized unit based on two or more different monomers (I) represented by the general formula (I). (I) may be included.
• the polymerized unit based on the other monomer is preferably a polymerized unit based on tetrafluoroethylene.
• the polymerized units based on the above other monomers may be the same or different in each occurrence, and the polymer (I) may contain polymerized units based on two or more different other monomers. good.
• Rf 3 is a monomer represented by a fluorine-containing alkyl group having 1 to 40 carbon atoms or a fluorine-containing alkyl group having an ether bond having 2 to 100 carbon atoms. .
• CH 2 CFCF 2 -O-Rf 3
• CF 2 CF-O-Rf 3
• CF 2 CFCF 2 -O-Rf 3
• CF 2 CF-Rf 3
• Rf 4 is a fluorine-containing alkyl group having 1 to 40 carbon atoms or a fluorine-containing alkyl group having an ether bond having 2 to 100 carbon atoms
• the body is also mentioned.
• the above Rf 4 groups are:
• Rf 5 is a fluorine-containing alkyl group having 1 to 40 carbon atoms or a fluorine-containing alkyl group having an ether bond having 2 to 100 carbon atoms).
• e6 is an integer of 1 to 10).
• Examples include.
• Examples include monomers such as.
• the lower limit of the content of the polymerized unit (I) in the polymer (I) is 20 mol% in order of increasing preference based on the total polymerized units constituting the polymer (I), since the water solubility is further improved.
• the content is 40 mol% or more, 45 mol% or more.
• the upper limit of the content of the polymerized unit (I) in the polymer (I) is 99 mol based on the total polymerized units constituting the polymer (I) in order of increasing the decomposition initiation temperature. % or less, 90 mol% or less, 80 mol% or less.
• the lower limit of the content of the polymerized unit (II) in the polymer (I) is 1 mol based on the total polymerized units constituting the polymer (I) in order of increasing preference since the decomposition initiation temperature becomes higher. % or more, 10 mol% or more, 20 mol% or more.
• the upper limit of the content of the polymerized unit (I) in the polymer (I) is 80 mol% in order of increasing preference based on the total polymerized units constituting the polymer (I), since the water solubility is further improved. Below, it is 60 mol% or less and 55 mol% or less.
• polymer (I) the upper limit of the content of polymerized units based on monomer (I) and other monomers copolymerizable with monomer (II) is 59 mol% or less and 45 mol% or less , 35 mol% or less, 25 mol% or less, 15 mol% or less, 5 mol% or less, and 1 mol% or less.
• the lower limits of the number average molecular weight of the polymer (I) are, in order of increasing preference, 0.3 ⁇ 10 4 or more, 0.4 ⁇ 10 4 or more, 0.5 ⁇ 10 4 or more, 0.7 ⁇ 10 4 or more, 0.8 ⁇ 10 4 or more, 1.0 ⁇ 10 4 or more, 1.2 ⁇ 10 4 or more, 1.4 ⁇ 10 4 , 1.6 ⁇ 10 4 or more, 1.8 ⁇ 10 4 or more, 2.0 ⁇ 10 4 or more, 3.0 ⁇ 10 4 or more, 4.0 ⁇ 10 4 or more.
• the upper limit of the number average molecular weight of the polymer (I) is, in order of preference, 75.0 ⁇ 10 4 or less, 50.0 ⁇ 10 4 or less, 40.0 ⁇ 10 4 or less, 30.0 ⁇ 10 4 or less, It is 20.0 ⁇ 10 4 or less.
• the lower limits of the weight average molecular weight of the polymer (I) are, in order of increasing preference, 0.4 ⁇ 10 4 or more, 0.5 ⁇ 10 4 or more, 0.6 ⁇ 10 4 or more, 0.8 ⁇ 10 4 or more, 1.0 ⁇ 10 4 or more, 1.2 ⁇ 10 4 or more, 1.4 ⁇ 10 4 or more, 1.7 ⁇ 10 4 or more, 1.9 ⁇ 10 4 or more, 2.1 ⁇ 10 4 or more, 2.
• weight average molecular weight of the polymer (I) is, in order of preference, 150.0 ⁇ 10 4 or less, 100.0 ⁇ 10 4 or less, 60.0 ⁇ 10 4 or less, 50.0 ⁇ 10 4 or less, It is 40.0 ⁇ 10 4 or less.
• the molecular weight distribution (Mw/Mn) of the polymer (I) is, in order of increasing preference, 3.0 or less, 2.7 or less, 2.4 or less, 2.2 or less, 2.0 or less, 1.9 or less, 1.7 or less, 1.5 or less, 1.4 or less, 1.3 or less.
• the number average molecular weight and weight average molecular weight are values calculated by gel permeation chromatography (GPC) using monodisperse polystyrene as a standard.
• GPC gel permeation chromatography
• the number average molecular weight of the polymer (I) can be determined by the correlation between the number average molecular weight calculated from the number of terminal groups obtained by NMR, FT-IR, etc. and the melt flow rate. You can ask for it. Melt flow rate can be measured in accordance with JIS K7210.
• the acid value of the polymer (I) is preferably 60 or more, more preferably 90 or more, even more preferably 120 or more, particularly preferably 150 or more, most preferably 180 or more, and the upper limit is not particularly limited, but is preferably 300 or less.
• the acid value of the polymer (I) is determined by determining whether the polymer (I) contains acid-type functional groups other than acid-type functional groups such as -SO 3 H and -COOH (for example, -SO 3 M, -COOM, etc.).
• M is a metal atom, -NR 7 4 , imidazolium which may have a substituent, pyridinium which may have a substituent, or phosphonium which may have a substituent). If the acid-type functional group is converted into an acid-type functional group, it can be measured by acid-base titration of the acid-type functional group.
• Polymer (I) usually has a terminal group.
• a terminal group is a terminal group formed during polymerization, and typical terminal groups include hydrogen, iodine, bromine, a chain or branched alkyl group, and a chain or branched fluoroalkyl group. and may optionally contain at least one catenary heteroatom.
• the alkyl group or fluoroalkyl group preferably has 1 to 20 carbon atoms.
• the polymer (I) has an ion exchange rate (IXR) of 43 or less.
• IXR is defined as the number of carbon atoms in the polymer backbone relative to the ionic group.
• Precursor groups that become ionic upon hydrolysis eg, -SO 2 F are not considered ionic groups for purposes of determining IXR.
• IXR is preferably 0.5 or more, more preferably 1 or more, even more preferably 3 or more, even more preferably 4 or more, and particularly preferably 5 or more. Further, IXR is more preferably 33 or less, particularly preferably 23 or less, particularly preferably 12 or less, and most preferably 10 or less.
• the ion exchange capacity of the polymer (I) is, in order of preference, 0.80 meq/g or more, 1.50 meq/g or more, 1.75 meq/g or more, 2.00 meq/g or more, and 2.20 meq/g. 2.50meq/g or more, 2.750meq/g or more, 3.00meq/g or more, 3.20meq/g or more, 3.50meq/g or more, 4.0meq/g or more, 4.50meq/g or more , 5.00 meq/g or more.
• the ion exchange capacity is the content of ionic groups (anionic groups) in the polymer (I), and is calculated from the composition of the polymer (I).
• polymer (I) the ionic groups (anionic groups) are typically distributed along the polymer main chain.
• Polymer (I) preferably comprises a polymer main chain with repeating side chains bonded to the main chain, and the side chains preferably have ionic groups.
• the polymer (I) has water solubility.
• Water-soluble means the property of being easily dissolved or dispersed in an aqueous medium.
• the water-soluble polymer (I) has a particle size that cannot be measured or has a particle size of 10 nm or less, for example, by dynamic light scattering (DLS).
• DLS dynamic light scattering
• the polymer (I) has sufficient water solubility.
• the higher the content of polymer (I) in an aqueous solution the more difficult it becomes to sufficiently dissolve or disperse polymer (I) in an aqueous medium. Therefore, even when the content of the polymer (I) in the aqueous solution is high, it can be said that the polymer (I) whose particle size cannot be measured by dynamic light scattering (DLS) has high water solubility.
• DLS dynamic light scattering
• the particle size of the polymer (I) cannot be measured even when it is contained in an aqueous solution at a content of 1.0% by mass. It is preferable that the particle size cannot be measured even when the polymer (I) is contained in the aqueous solution at a content of more preferably 1.5% by mass, and still more preferably 2.0% by mass.
• the viscosity of the aqueous solution of polymer (I) is preferably 5.0 mPa. s or more, more preferably 8.0 mPa.s or more. s or more, more preferably 10.0 mPa. s or more, particularly preferably 12.0 mPa. s or more, most preferably 14.0 mPa. s or more, preferably 100.0 mPa. s or less, more preferably 50.0 mPa. s or less, more preferably 25.0 mPa. s or less, particularly preferably 20.0 mPa. s or less.
• the viscosity of the aqueous solution of the polymer (I) was determined by adjusting the content of the polymer (I) in the aqueous solution to 33% by mass based on the aqueous solution, and adjusting the viscosity of the resulting aqueous solution using a tuning fork manufactured by A&D Co., Ltd. It can be identified by measuring at 20°C using a vibrating viscometer (model number: SV-10).
• the critical micelle concentration (CMC) of the polymer (I) is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, still more preferably 1% by mass or more, and preferably 20% by mass or more. It is not more than 10% by mass, more preferably not more than 10% by mass, even more preferably not more than 5% by mass.
• the critical micelle concentration of polymer (I) can be determined by measuring surface tension.
• the surface tension can be measured, for example, using a surface tension meter CBVP-A3 model manufactured by Kyowa Interface Science Co., Ltd.
• the polymer (I) may be substantially free of dimers and trimers of monomer (I). Dimers and trimers of monomer (I) are usually produced when monomer (I) is polymerized to obtain polymer (I).
• the content of dimer and trimer in polymer (I) is 1.0% by mass or less, preferably 0.1% by mass or less, more preferably 0.1% by mass or less, based on polymer (I). 0.01% by mass or less, more preferably 0.001% by mass or less, particularly preferably 0.0001% by mass or less.
• the polymer (I) may be substantially free of dimers and trimers composed of monomer (I) and monomer (II). Dimers and trimers composed of monomer (I) and monomer (II) are usually obtained by polymerizing monomer (I) and monomer (II) to obtain polymer (I). arise.
• the content of dimer and trimer in polymer (I) is 1.0% by mass or less, preferably 0.1% by mass or less, more preferably 0.1% by mass or less, based on polymer (I). 0.01% by mass or less, more preferably 0.001% by mass or less, particularly preferably 0.0001% by mass or less.
• the content of dimer and trimer in polymer (I) is determined by performing gel permeation chromatography (GPC) analysis of polymer (I) and calculating the content of dimer and trimer with respect to the total area of each peak in the chromatogram obtained by GPC analysis. It can be identified by calculating the ratio of the total peak area (area percentage).
• GPC gel permeation chromatography
• LC/MS liquid chromatography-mass spectrometry
• Methanol is added to polymer (I) to prepare a mixture, which is filtered using an ultrafiltration disk (molecular weight cut off: 3000 Da), and the resulting recovered liquid is analyzed by LC/MS. Then, using the calibration curve, the area area (peak integral value) can be converted into the content of dimer and trimer, respectively.
• the content of the fraction having a molecular weight of 3000 or less in the polymer (I) may be 3.7% or less, preferably 3.2% or less, and more preferably 2.7% or less, even more preferably 1.7% or less, particularly preferably 1.2% or less, particularly preferably 1.0% or less, most preferably 0.5% It is as follows. Although the lower limit of the content of the fraction having a molecular weight of 3000 or less is not limited, it is, for example, 0.01%. The content of the fraction having a molecular weight of 3000 or less can be calculated from the peak area of GPC. The fraction with a molecular weight of 3000 or less includes all compounds with a molecular weight of 3000 or less.
• the content of the fraction with a molecular weight of 2000 or less in the polymer (I) may be 3.2% or less, preferably 2.7% or less, and more preferably It is 2.2% or less, still more preferably 1.7% or less, particularly preferably 1.2% or less, particularly preferably 0.6% or less.
• the lower limit of the content of the fraction having a molecular weight of 2000 or less is not limited, it is, for example, 0.01%.
• the content of the fraction having a molecular weight of 2000 or less can be calculated from the peak area of GPC.
• the fraction with a molecular weight of 2000 or less includes all compounds with a molecular weight of 2000 or less.
• the content of the fraction having a molecular weight of 1500 or less in the polymer (I) may be 2.7% or less, preferably 2.2% or less, and more preferably It is 1.7% or less, still more preferably 1.2% or less, particularly preferably 0.6% or less.
• the lower limit of the content of the fraction having a molecular weight of 1500 or less is not limited, it is, for example, 0.01%.
• the content of the fraction having a molecular weight of 1500 or less can be calculated from the peak area of GPC.
• the fraction with a molecular weight of 1,500 or less includes all compounds with a molecular weight of 1,500 or less.
• the content of the fraction with a molecular weight of 1000 or less in the polymer (I) may be 2.2% or less, preferably 1.7% or less, and more preferably It is 1.2% or less, and even more preferably 0.6% or less.
• the lower limit of the content of the fraction having a molecular weight of 1000 or less is not limited, it is, for example, 0.01%.
• the content of the fraction having a molecular weight of 1000 or less can be calculated from the peak area of GPC.
• the fraction with a molecular weight of 1000 or less includes all compounds with a molecular weight of 1000 or less.
• the polymer (I) preferably contains substantially no fluorine-containing surfactant.
• "not substantially containing a fluorine-containing surfactant” means that the content of the fluorine-containing surfactant in the polymer (I) is 10 mass ppm or less, preferably 1 mass ppm or less, more preferably 100 mass ppb or less, still more preferably 10 mass ppb or less, even more preferably 1 mass ppb or less, particularly preferably liquid chromatography-mass spectrometry ( The amount of fluorine-containing surfactant is below the detection limit as measured by LC/MS).
• the content of the fluorine-containing surfactant can be determined by a known method. For example, it can be quantified by LC/MS analysis. First, methanol is added to polymer (I), extraction is performed, and the resulting extract is analyzed by LC/MS. In order to further increase the extraction efficiency, treatments such as Soxhlet extraction and ultrasonication may be performed. Molecular weight information is extracted from the obtained LC/MS spectrum, and consistency with the structural formula of the candidate fluorine-containing surfactant is confirmed. After that, we prepared aqueous solutions with contents of five or more levels of the confirmed fluorine-containing surfactants, and conducted LC/MS analysis of the aqueous solutions with each content to determine the content and the relationship between the area and the content. Plot and draw a calibration curve. Then, using the calibration curve, the area of the LC/MS chromatogram of the fluorine-containing surfactant in the extract can be converted into the content of the fluorine-containing surfactant.
• the fluorine-containing surfactant will be described later in the explanation regarding the polymerization of the fluoromonomer.
• Polymer (I) can be produced by a production method of producing a polymer by polymerizing monomer (I) and monomer (II).
• the polymerization temperature of monomer (I) and monomer (II) is preferably 70°C or lower, more preferably 65°C or lower, since a polymer with a higher molecular weight can be easily produced.
• the temperature is more preferably 60°C or lower, even more preferably 55°C or lower, even more preferably 50°C or lower, particularly preferably 45°C or lower, and most preferably 40°C or lower.
• the temperature is preferably 10°C or higher, more preferably 15°C or higher, and even more preferably 20°C or higher.
• monomer (I) and monomer (II) may be copolymerized with the other monomers mentioned above.
• polymerization may be performed in the presence of a pH adjuster.
• the pH adjuster may be added before or after the start of polymerization.
• pH adjusting agents include ammonia, sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, ammonium carbonate, sodium hydrogen carbonate, potassium hydrogen carbonate, ammonium hydrogen carbonate, sodium phosphate, potassium phosphate, sodium citrate, and citric acid.
• Potassium acid, ammonium citrate, sodium gluconate, potassium gluconate, ammonium gluconate, etc. can be used.
• the above pH can be measured using a pH meter manufactured by Orion.
• the polymerization pressure is usually atmospheric pressure to 10 MPaG.
• the polymerization pressure is appropriately determined depending on the type of monomer used, the molecular weight of the desired polymer, and the reaction rate.
• the polymerization time is usually 1 to 200 hours, and may be 5 to 100 hours.
• the polymerization of monomer (I) and monomer (II) may be performed in an aqueous medium or in the absence of an aqueous medium.
• a non-aqueous medium for example, toluene, etc.
• Monomer (I) and monomer (II) may be polymerized in the presence of an organic solvent).
• the polymerization of monomer (I) and monomer (II) may be emulsion polymerization, suspension polymerization, or bulk polymerization.
• the aqueous medium is a reaction medium in which polymerization is carried out, and means a liquid containing water.
• the aqueous medium is not particularly limited as long as it contains water, and includes water, a fluorine-free organic solvent such as alcohol, ether, and ketone, and/or a fluorine-containing organic solvent whose boiling point is 40°C or less. It may also include.
• the aqueous medium is preferably water.
• the oxygen concentration in the polymerization reaction system is preferably 1500 volume ppm or less, more preferably 500 volume ppm or less, and even more preferably 100 volume ppm or less, since a polymer with a higher molecular weight can be easily produced.
• the content is particularly preferably 50 volume ppm or less.
• the oxygen concentration in the reaction system is usually 0.01 volume ppm or more. In the above production method, it is preferable that the oxygen concentration in the reaction system is maintained within the above range throughout the polymerization period of monomer (I) and monomer (II).
• the oxygen concentration in the polymerization reaction system can be determined by, for example, using an inert gas such as nitrogen or argon, or when gaseous monomers are used, the gaseous monomers are added to the liquid phase in the reactor or It can be controlled by flowing in the gas phase.
• the oxygen concentration in the polymerization reaction system can be determined by measuring and analyzing the gas discharged from the exhaust gas line of the polymerization system using a low concentration oxygen analyzer.
• monomer (I) and monomer (II) can be polymerized in the presence of a polymerization initiator.
• the polymerization initiator is not particularly limited as long as it can generate radicals within the above polymerization temperature range, and any known oil-soluble and/or water-soluble polymerization initiator can be used.
• polymerization can also be initiated as redox in combination with a reducing agent or the like.
• concentration of the polymerization initiator is appropriately determined depending on the type of monomer, the molecular weight of the desired polymer, and the reaction rate.
• a water-soluble polymerization initiator such as persulfate.
• an oil-soluble polymerization initiator such as peroxide.
• persulfates for example, ammonium persulfate
• organic peroxides such as disuccinic acid peroxide
• diglutaric acid peroxide can be used alone or in the form of a mixture thereof. Further, it may be used in combination with a reducing agent such as sodium sulfite to form a redox system.
• a radical scavenger such as hydroquinone or catechol may be added, or a peroxide decomposer such as ammonium sulfite may be added to adjust the radical concentration within the system.
• persulfates are particularly preferred because they can easily produce polymers with higher molecular weights.
• examples of the persulfate include ammonium persulfate, potassium persulfate, sodium persulfate, and the like, with ammonium persulfate being preferred.
• An oil-soluble radical polymerization initiator may be used as the polymerization initiator.
• the oil-soluble radical polymerization initiator may be a known oil-soluble peroxide, such as dialkyl peroxycarbonates such as diisopropyl peroxydicarbonate, disec-butylperoxydicarbonate, t-butylperoxycarbonate, etc. Peroxy esters such as isobutyrate, t-butylperoxypivalate, dialkyl peroxides such as di-t-butyl peroxide, etc.
• the amount of the polymerization initiator added is not particularly limited, but it may be added in an amount that does not significantly reduce the polymerization rate (for example, several ppm to water concentration) or more at the beginning of the polymerization, either all at once, sequentially, or continuously. Just add it.
• the upper limit is a range in which the reaction temperature can be raised while removing heat from the polymerization reaction from the equipment surface, and a more preferable upper limit is a range in which the polymerization reaction heat can be removed from the equipment surface.
• the polymerization initiator is added at the start of the polymerization, and can also be added during the polymerization.
• the ratio of the amount of polymerization initiator added at the start of polymerization to the amount of polymerization initiator added during polymerization is preferably 95/5 to 5/95, more preferably 60/40 to 10. /90, more preferably 30/70 to 15/85.
• the method of adding the polymerization initiator during polymerization is not particularly limited, and the entire amount may be added at once, divided into two or more times, or added continuously. Good too.
• the total amount of the polymerization initiator used for polymerization is preferably 0.00001 to 10% by mass based on the aqueous medium. .
• the total amount of the polymerization initiator used in polymerization is preferably 0.0001% by mass or more, more preferably 0.001% by mass or more, still more preferably 0.01% by mass or more, and preferably It is 5% by mass or less, more preferably 2% by mass or less.
• the total amount of the polymerization initiator used in the polymerization is 0.001 to 100% of the total amount of the monomers used in the polymerization. Preferably it is 10 mol%.
• the total amount of the polymerization initiator used in polymerization is more preferably 0.005 mol% or more, still more preferably 0.01 mol% or more, particularly preferably 0.1 mol% or more, and most preferably Preferably it is 0.5 mol% or more, more preferably 10 mol% or less, even more preferably 5.0 mol% or less, even more preferably 2.5 mol% or less, particularly most preferably It is 2.2 mol% or less, preferably 2.0 mol% or less.
• the amount of monomers containing monomer (I) and monomer (II) at the start of polymerization is The amount is preferably 20% by mass or more based on the amount present.
• the amount of monomer present is more preferably 30% by mass or more, still more preferably 40% by mass or more.
• the upper limit of the amount of the monomer present is not particularly limited, but may be 200% by mass or less from the viewpoint of allowing the polymerization to proceed smoothly.
• the amount of monomers present at the start of polymerization refers to the amount of monomer (I) and monomer (II) and other monomers, if any, present in the reactor at the start of polymerization. is the total abundance.
• the total amount of polymerization initiator such as peroxide added should be The amount is preferably 0.001 to 10 mol % based on the total amount of monomers (monomer mixture) containing II).
• the total addition amount of the polymerization initiator used in polymerization is more preferably 0.005 mol% or more, still more preferably 0.01 mol% or more, more preferably 10 mol% or less, and still more preferably It is 5.0 mol% or less, particularly preferably 2.5 mol% or less, most preferably 2.2 mol% or less, and preferably 2.0 mol% or less.
• Polymerization of monomer (I) and monomer (II) is carried out by adding an aqueous medium, monomer (I), monomer (II), and other monomers as necessary to a reactor. By charging other additives as necessary, stirring the contents of the reactor, and holding the reactor at a predetermined polymerization temperature, then adding a predetermined amount of polymerization initiator to initiate the polymerization reaction. It can be carried out. After the start of the polymerization reaction, monomers, polymerization initiators, and other additives may be added depending on the purpose.
• the polymerization of monomer (I) and monomer (II) can be carried out substantially in the absence of a fluorine-containing surfactant.
• substantially in the absence of a fluorine-containing surfactant means that the amount of the fluorine-containing surfactant relative to the aqueous medium is 10 mass ppm or less.
• the amount of the fluorine-containing surfactant in the aqueous medium is preferably 1 ppm by mass or less, more preferably 100 ppb by mass or less, still more preferably 10 ppb by mass or less, and even more preferably 1 ppb by mass or less. It is.
• fluorine-containing surfactant examples include anionic fluorine-containing surfactants.
• the anionic fluorine-containing surfactant may be, for example, a surfactant containing fluorine atoms having a total carbon number of 20 or less in the portion excluding the anionic group.
• the fluorine-containing surfactant will be described later in the explanation regarding the polymerization of the fluoromonomer.
• an aqueous solution containing the polymer (I) and an aqueous medium is usually obtained.
• the aqueous solution containing the obtained polymer (I) may be used as it is for polymerization, or the polymer (I) obtained by separating it from the aqueous solution may be used for polymerization.
• the method for separating the polymer (I) from the aqueous solution is not particularly limited.
• the polymer (I) can be separated by methods such as coagulating the polymer (I) in an aqueous solution, washing it, and drying it.
• the polymer (I) or aqueous solution obtained by polymerizing monomer (I) and monomer (II) contains a fraction with a molecular weight of 3000 or less, a fraction with a molecular weight of 2000 or less, and a fraction with a molecular weight of 1500 or less. fractions, fractions with a molecular weight of 1000 or less, dimers and trimers of monomer (I), dimers and trimers composed of monomer (I) and monomer (II), and the like.
• the polymer (I) or aqueous solution obtained by polymerizing monomer (I) and monomer (II) may be post-treated.
• the composition containing the aqueous medium and polymer (I) is recovered, and the resulting composition is
• the treatment may be performed by at least one method selected from the group consisting of , ultrafiltration, microfiltration, dialysis membrane treatment, liquid separation, and reprecipitation.
• the polymer (I) or the composition is mixed with an aqueous medium, and the resulting aqueous medium and the composition containing the polymer (I) are subjected to ultrafiltration, precision filtration, or dialysis membrane treatment. , liquid separation, and reprecipitation.
• the composition obtained by polymerizing monomer (I) and monomer (II) usually contains a total of more than 1.0% by mass of dimer and Includes trimmer.
• the content of dimer and trimer in the polymer (I) may be, for example, 2.0% by mass or more, or 3.0% by mass or more with respect to the polymer (I). , 30.0% by mass or less, or 20.0% by mass or less.
• the content of dimer and trimer in the composition is determined by performing gel permeation chromatography (GPC) analysis of the composition and determining the ratio of the total peak area of dimer and trimer to the total area of each peak in the chromatogram obtained by GPC analysis. It can be specified by calculating (area percentage).
• the composition obtained by polymerizing monomer (I) and monomer (II) usually contains a total of more than 1.0% by mass of monomers based on the mass of polymer (I). Dimers and trimers composed of monomer (I) and monomer (II) are included.
• the content of dimer and trimer composed of monomer (I) and monomer (II) in polymer (I) is, for example, 2.0% by mass or more with respect to polymer (I).
• the content may be 3.0% by mass or more, 30.0% by mass or less, or 20.0% by mass or less.
• the content of dimer and trimer in the composition is determined by performing gel permeation chromatography (GPC) analysis of the composition and determining the ratio of the total peak area of dimer and trimer to the total area of each peak in the chromatogram obtained by GPC analysis. It can be specified by calculating (area percentage).
• GPC gel permeation chromatography
• the obtained composition containing the aqueous medium and the polymer (I) is collected, and the obtained composition is subjected to a group consisting of ultrafiltration, microfiltration, dialysis membrane treatment, liquid separation, and reprecipitation.
• the treatment is carried out by at least one selected means.
• the dimer and trimer of monomer (I) contained in the composition obtained by polymerization of monomer (I) and monomer (II), or monomer (I) and monomer Dimers and trimers composed of body (II) can be removed from the composition.
• At least one kind of means selected from the group consisting of ultrafiltration, microfiltration, liquid separation and reprecipitation is more preferable, and at least one type of means selected from the group consisting of ultrafiltration and liquid separation More preferred means are particularly preferred, ultrafiltration being particularly preferred.
• Dimers and trimers of monomer (I) or dimers and trimers composed of monomer (I) and monomer (II) are produced by polymerization of monomer (I) and monomer (II).
• dimers and trimers of monomer (I) or dimers and trimers composed of monomer (I) and monomer (II) are contained in polymer (I). .
• unreacted monomer (I) is usually also removed from the composition at the same time. Furthermore, by appropriately selecting the post-treatment means, it is also possible to remove fractions with a molecular weight of 3,000 or less, molecular weights of 2,000 or less, molecular weights of 1,500 or less, and molecular weights of 1,000 or less.
• the composition obtained by polymerizing monomer (I) and monomer (II) may be a finished composition obtained by polymerization, or a finished composition obtained by polymerization. It may be diluted or concentrated, or it may be subjected to dispersion stabilization treatment or the like. In order to smoothly proceed with ultrafiltration, microfiltration, or dialysis membrane treatment, it is also preferable to adjust the viscosity of the composition by these treatments.
• the content of polymer (I) in the composition is not particularly limited, and may be, for example, 0.1 to 40.0% by mass.
• the content of polymer (I) in the composition is preferably 30.0% by mass or less, more preferably 25.0% by mass or less, and even more preferably is 20.0% by mass or less, particularly preferably 10.0% by mass or less, preferably 0.5% by mass or more, more preferably 1.0% by mass or more, still more preferably 1. It is 2% by mass or more, particularly preferably 1.5% by mass or more.
• the content of polymer (I) in the composition can be determined, for example, by adding water to a composition obtained by polymerizing monomer (I) and monomer (II), or by adding water to a composition obtained by polymerizing monomer (I). It can also be prepared by concentrating a composition obtained by polymerizing monomer (II).
• the pH of the composition is preferably -7.0 to 11.0, more preferably -6.0 to 8.0, even more preferably -5.0 to 7.0.
• the pH of the composition can be adjusted by adding a pH adjuster to the composition obtained by polymerizing monomer (I) and monomer (II).
• the pH adjuster may be acid or alkali, and includes, for example, phosphate, sodium hydroxide, potassium hydroxide, aqueous ammonia, and the like.
• the viscosity of the composition is preferably 25 mPa ⁇ s or less because these treatments proceed smoothly.
• the viscosity of the composition can be determined, for example, by adjusting the weight average molecular weight and number average molecular weight of the polymer (I), by adjusting the concentration of the polymer (I) in the composition, and by adjusting the temperature of the composition. It can be adjusted by
• the above-mentioned ultrafiltration or microfiltration may be a cross-flow method or a dead-end method, but is not limited thereto, but a cross-flow method is preferable from the viewpoint of reducing clogging of the membrane.
• the above ultrafiltration can be performed using an ultrafiltration membrane.
• Ultrafiltration can be performed, for example, using an ultrafiltration device having an ultrafiltration membrane, and centrifugal ultrafiltration, batch ultrafiltration, circulating ultrafiltration, etc. can be employed.
• the molecular weight cutoff of the ultrafiltration membrane is usually about 0.1 ⁇ 10 4 to 30 ⁇ 10 4 Da.
• the ultrafiltration membrane preferably has a molecular weight cut-off of 0.3 ⁇ 10 4 Da or more, since it can suppress membrane clogging and efficiently reduce dimers and trimers.
• the molecular weight cut-off is more preferably 0.5 ⁇ 10 4 Da or more, particularly preferably 0.8 ⁇ 10 4 Da or more, and most preferably 1.0 ⁇ 10 4 Da or more.
• the molecular weight cutoff may be 1.0 ⁇ 10 4 Da or more. Further, from the viewpoint of dimer and trimer removal efficiency, the molecular weight cutoff is preferably 20 ⁇ 10 4 Da or less, more preferably 10 ⁇ 10 4 Da or less.
• the molecular weight cutoff of the ultrafiltration membrane can be determined, for example, by passing water through the membrane through polystyrene having a known weight average molecular weight, and setting the molecular weight that can block 90% of the water as the molecular weight cutoff. Quantification of polystyrene can be performed using gel permeation chromatography.
• Examples of the shape of the ultrafiltration membrane include conventionally known shapes, but are not limited to such shapes, and include, for example, a hollow fiber type, a flat membrane type, a spiral type, a tubular type, and the like. From the viewpoint of preventing clogging, a hollow fiber type is preferable.
• the inner diameter of the hollow fiber ultrafiltration membrane is not limited, but may be, for example, 0.1 to 2 mm. Preferably it is 0.8 to 1.4 mm.
• the length of the hollow fiber ultrafiltration membrane is not limited, but may be, for example, 0.05 to 3 m. Preferably it is 0.05 to 2 m.
• Materials for the ultrafiltration membrane are not particularly limited, but include cellulose, cellulose ester, polysulfone, sulfonated polysulfone, polyether sulfone, sulfonated polyether sulfone, chlorinated polyethylene, polypropylene, polyolefin, polyvinyl alcohol, Examples include organic materials such as polymethyl methacrylate, polyacrylonitrile, polyvinylidene fluoride, and polytetrafluoroethylene, metals such as stainless steel, and inorganic materials such as ceramics.
• the material of the ultrafiltration membrane is preferably an organic material, more preferably chlorinated polyethylene, polypropylene, polyvinylidene fluoride, polytetrafluoroethylene, polyacrylonitrile, polysulfone, or polyethersulfone. More preferred are acrylonitrile, polysulfone or polyvinylidene fluoride.
• the ultrafiltration membranes mentioned above include DESAL's G-5 type, G-10 type, G-20 type, G-50 type, PW type, HWS UF type; KOCH's HFM-180, HFM- 183, HFM-251, HFM-300, HFM-116, HFM-183, HFM-300, HFK-131, HFK-328, MPT-U20, MPS-U20P, MPS-U20S; Synder's SPE1, SPE3, SPE5 , SPE10, SPE30, SPV5, SPV50, SOW30; Microza (registered trademark) UF series manufactured by Asahi Kasei Corporation; NTR7410 manufactured by Nitto Denko Corporation.
• the above ultrafiltration is preferably performed at a pressure of 0.01 MPa or higher from the viewpoint of dimer and trimer removal efficiency. More preferably, it is 0.03 MPa or more, and still more preferably 0.05 MPa or more. Further, from the viewpoint of pressure resistance, the above pressure is preferably 0.5 MPa or less, more preferably 0.25 MPa or less, and even more preferably 0.2 MPa or less.
• the ultrafiltration is preferably performed at a flow rate of 10 mL/min or more, more preferably 50 mL/min or more, and more preferably 5000 mL/min or less. It is preferably carried out, and more preferably carried out at a flow rate of 1000 mL/min or less.
• the above precision filtration can be performed using a precision filtration membrane.
• Microfiltration membranes typically have an average pore size of 0.05 to 1.0 ⁇ m.
• the precision filtration membrane preferably has an average pore diameter of 0.1 ⁇ m or more because it can efficiently remove dimers and trimers. More preferably, it is 0.075 ⁇ m or more, and still more preferably 0.1 ⁇ m or more.
• the average pore diameter is 1.00 ⁇ m or less. More preferably, the average pore diameter is 0.50 ⁇ m or less, and still more preferably 0.25 ⁇ m or less.
• the average pore diameter of the microfiltration membrane can be measured in accordance with ASTM F 316-03 (bubble point method).
• the shape of the precision filtration membrane is not limited to conventionally known ones, and includes, for example, a hollow fiber type, a flat membrane type, a spiral type, a tubular type, and the like. From the viewpoint of preventing clogging, a hollow fiber type is preferable.
• the inner diameter of the hollow fiber microfiltration membrane is not limited, but may be, for example, 0.1 to 2 mm. Preferably it is 0.8 to 1.4 mm.
• the length of the hollow fiber microfiltration membrane is not limited, but may be, for example, 0.05 to 3 m. Preferably it is 0.05 to 2 m.
• Examples of the materials for the microfiltration membrane include cellulose, aromatic polyamide, polyvinyl alcohol, polysulfone, polyethersulfone, polyvinylidene fluoride, polyethylene, polyacrylonitrile, polypropylene, polycarbonate, polytetrafluoroethylene, ceramics, and metal. It will be done. Among these, aromatic polyamide, polyvinyl alcohol, polysulfone, polyvinylidene fluoride, polyethylene, polyacrylonitrile, polypropylene, polycarbonate, or polytetrafluoroethylene are preferred, and polyacrylonitrile or polyvinylidene fluoride is particularly preferred.
• the precision filtration membranes include Cefilt manufactured by NGK; Microza U series and Microza P series manufactured by Asahi Kasei; POREFLON SPMW, POREFLON OPMW, and POREFLON PM manufactured by Sumitomo Electric; Trefil manufactured by Toray Industries; Micro Examples include NADIR MP005 and NADIR MV020 manufactured by Dine Nadia; X-flow manufactured by Norit.
• the above precision filtration is preferably performed at a pressure of 0.01 MPa or higher from the viewpoint of dimer and trimer removal efficiency. More preferably, it is 0.03 MPa or more, and still more preferably 0.05 MPa or more. Further, from the viewpoint of pressure resistance, the above pressure is preferably 0.5 MPa or less, more preferably 0.25 MPa or less, and even more preferably 0.2 MPa or less.
• the above precision filtration is preferably performed at a flow rate of 10 mL/min or more, more preferably 50 mL/min or more, and is preferably performed at a flow rate of 5000 mL/min or less, from the viewpoint of dimer and trimer removal efficiency. This is preferably carried out at a flow rate of 1000 mL/min or less, and more preferably at a flow rate of 1000 mL/min or less.
• Dialysis membranes usually have a molecular weight cutoff of 0.05 ⁇ 10 4 to 100 ⁇ 10 4 Da.
• the dialysis membrane preferably has a molecular weight cut-off of 0.3 ⁇ 10 4 Da or more because it can suppress membrane clogging and efficiently remove dimers and trimers.
• the molecular weight cutoff is more preferably 0.5 ⁇ 10 4 Da or more, even more preferably 0.8 ⁇ 10 4 Da or more, and even more preferably 1.0 ⁇ 10 4 Da or more.
• the molecular weight cutoff may be 1.0 ⁇ 10 4 Da or more.
• the molecular weight cutoff is preferably 20 ⁇ 10 4 Da or less, more preferably 10 ⁇ 10 4 Da or less.
• the molecular weight cutoff of the dialysis membrane can be measured, for example, by the same method as that of an ultrafiltration membrane.
• the material of the dialysis membrane is not particularly limited, but examples include cellulose, polyacrylonitrile, polymethyl methacrylate, ethylene vinyl alcohol copolymer, polysulfone, polyamide, and polyester polymer alloy.
• dialysis membranes include Spectrum Laboratories' Spectra/Por (registered trademark) Float-A-Lyzer, Tube-A-Lyzer, Dialysis tubing, 6Dialysis tubing, 7Dialysis tubing, etc. shown.
• the above ultrafiltration, microfiltration or dialysis membrane treatment is preferably performed at a temperature of 10°C or higher.
• the temperature is more preferably 15°C or higher, still more preferably 20°C or higher, and particularly preferably 30°C or higher. By setting the temperature within the above range, dimers and trimers can be reduced more efficiently.
• the temperature is preferably 90°C or lower, more preferably 80°C or lower, even more preferably 70°C or lower, and particularly preferably 60°C or lower.
• Ultrafiltration, microfiltration, or dialysis membrane treatment can be performed while adding water to the composition or while adjusting the pH of the composition. Water may be added to the composition intermittently or continuously.
• the end point of ultrafiltration, microfiltration or dialysis membrane treatment is not limited as long as it is determined appropriately. Further, in the ultrafiltration, microfiltration or dialysis membrane treatment, backwashing with water may be performed once every 1 to 24 hours of filtration time to improve the durability of the filtration membrane.
• Liquid separation can be carried out, for example, by adding an organic solvent to the composition, separating it into two phases, an aqueous phase and an organic solvent phase, and collecting the aqueous phase.
• Reprecipitation involves dropping the composition into a poor solvent to precipitate the polymer (I), recovering the precipitated polymer (I), dissolving the recovered polymer (I) in a good solvent, and This can be carried out by dropping the obtained solution into a poor solvent to precipitate the polymer (I) again, and collecting the precipitated polymer (I).
• an aqueous solution containing the polymer (I) that is substantially free of dimers and trimers or a fraction having a molecular weight of 3000 or less is usually obtained.
• An aqueous solution containing polymer (I) with a reduced content of is obtained.
• the aqueous solution containing the polymer (I) obtained by treating the composition may be used as it is for polymerization, or the polymer (I) obtained by separating it from the aqueous solution may be used for polymerization. Good too.
• the method for separating the polymer (I) from the aqueous solution is not particularly limited.
• the polymer (I) can be separated by methods such as coagulating the polymer (I) in an aqueous solution, washing it, and drying it.
• the polymer (I) or an aqueous solution containing the polymer (I) and an aqueous medium can be obtained.
• a fluoropolymer is obtained by polymerizing a fluoromonomer in an aqueous medium in the presence of polymer (I).
• the fluoromonomer preferably has at least one double bond.
• a fluoromonomer represented by General formula (120): CF 2 CF-OCH 2 -Rf 121 (wherein Rf 121 is a perfluoroalkyl group having 1 to 5 carbon atoms),
• General formula (130): CF 2 CFOCF 2 ORf 131 (In the formula, Rf 131 is a linear or branched perfluoroalkyl group having 1 to 6 carbon atoms, a cyclic perfluoroalkyl group having 5 to 6 carbon atoms, or a cyclic perfluoroalkyl group having 2 to 6 carbon atoms containing 1 to 3 oxygen atoms.
• a fluoromonomer represented by (a linear or branched perfluorooxyalkyl group), General formula (140): CF 2 CFO(CF 2 CF(Y 141 )O) m (CF 2 ) n F (In the formula, Y 141 represents a fluorine atom or a trifluoromethyl group. m is an integer of 1 to 4.
• n is an integer of 1 to 4.
• General formula (150): CF 2 CF-O-(CF 2 CFY 151 -O) n -(CFY 152 ) m -A 151
• Y 151 represents a fluorine atom, a chlorine atom, a -SO 2 F group, or a perfluoroalkyl group.
• the perfluoroalkyl group may include ether oxygen and a -SO 2 F group.
• n is , represents an integer from 0 to 3.
• n Y 151 may be the same or different.
• Y 152 represents a fluorine atom, a chlorine atom, or a -SO 2 F group.
• m is Represents an integer from 1 to 5.
• a 151 represents -SO 2 X 151 , -COZ 151 or -POZ 152 Z 153 .
• X 151 represents F, Cl, Br, I, -OR 151 or -NR 152 R 153.
• Z 151 , Z 152 and Z 153 are the same or different and represent -NR 154 R 155 or -OR 156
• R 151 , R 152 , R 153 , R 154 , R 155 and R 156 are the same or different and represent an alkyl group, an aryl group, or a sulfonyl-containing group which may contain H, ammonium, an alkali metal, or a fluorine atom.
• the fluoromonomer is at least one selected from the group consisting of fluoromonomers represented by the following.
• perfluoroorganic group means an organic group in which all hydrogen atoms bonded to carbon atoms are replaced with fluorine atoms.
• the perfluoro organic group may have an ether oxygen.
• Examples of the fluoromonomer represented by the general formula (110) include fluoromonomers in which Rf 111 is a perfluoroalkyl group having 1 to 10 carbon atoms.
• the perfluoroalkyl group preferably has 1 to 5 carbon atoms.
• Examples of the perfluoroorganic group in general formula (110) include perfluoromethyl group, perfluoroethyl group, perfluoropropyl group, perfluorobutyl group, perfluoropentyl group, and perfluorohexyl group.
• Further examples of the fluoromonomer represented by the general formula (110) include those in which Rf 111 is a perfluoro(alkoxyalkyl) group having 4 to 9 carbon atoms, and Rf 111 is the following formula:
• Rf is a group represented by the following formula:
• n an integer of 1 to 4.
• CF 2 CF-ORf 161
• Rf 161 represents a perfluoroalkyl group having 1 to 10 carbon atoms.
• a fluoromonomer represented by the following is preferred.
• Rf 161 is preferably a perfluoroalkyl group having 1 to 5 carbon atoms.
• the fluoroalkyl vinyl ether is preferably at least one selected from the group consisting of fluoromonomers represented by general formulas (160), (130), and (140).
• the fluoromonomer represented by general formula (160) is preferably at least one selected from the group consisting of perfluoro(methyl vinyl ether), perfluoro(ethyl vinyl ether), and perfluoro(propyl vinyl ether); At least one selected from the group consisting of fluoro(methyl vinyl ether) and perfluoro(propyl vinyl ether) is more preferred.
• the fluoromonomer represented by the general formula (100) is preferably a fluoromonomer in which Rf 101 is a linear fluoroalkyl group, and more preferably a fluoromonomer in which Rf 101 is a linear perfluoroalkyl group.
• the number of carbon atoms in Rf 101 is preferably 1 to 6.
• fluoroalkylethylene is represented by CH 2 ⁇ CH—C 4 F 9 and CH 2 ⁇ CH -C 6 F 13 is more preferable.
• Rf 111 in general formula (180) is the same as Rf 111 in general formula (110).
• Rf 111 is preferably a perfluoroalkyl group having 1 to 10 carbon atoms or a perfluoroalkoxyalkyl group having 1 to 10 carbon atoms.
• the above-mentioned fluorinated vinyl heterocyclic body has the general formula (230): (wherein X 231 and X 232 are independently F, Cl, a methoxy group or a fluorinated methoxy group, and Y 231 is formula Y 232 or formula Y 233 .
• Z 231 and Z 232 are independently F or a fluorinated alkyl group having 1 to 3 carbon atoms).
• CX 181 2 CX 182 -R f 181 CHR 181 X 183 ( In the formula , X 181 and a fluoromonomer represented by an oxyalkylene group, R 181 is a hydrogen atom or CH 3 , and X 183 is an iodine atom or a bromine atom);
• CX 191 2 CX 192 -R f 191 X 193 (In the formula, X 191 and X 192 are independently a hydrogen atom, a fluorine atom, or CH 3 , R f 191 is a fluoroalkylene group, a perfluoroalkylene group, a fluoropolyoxyalkylene group, or a perfluoropolyoxyalkylene group, X 193 is an iodine atom or a bromine atom.)
• Z 221 is a straight chain or branched an alkylene group having 1 to 18 carbon atoms, a cycloalkylene group having 3 to 18 carbon atoms, an at least partially fluorinated alkylene group having 1 to 10 carbon atoms, or an oxyalkylene group having 1 to 18 carbon atoms, which may have an oxygen atom; base, or -(Q) p -CF 2 O-(CF 2 CF 2 O) m (CF 2 O) n -CF 2 -(Q) p - (In the formula, Q is an alkylene group or an oxyalkylene group. p is 0 or 1. m/n is 0.2 to 5.) and has a molecular weight of 500 to 10,000 (per) It is a fluoropolyoxyalkylene group. ) is preferably at least one selected from the group consisting of monomers represented by the following.
• X 183 and X 193 are iodine atoms.
• R f 181 and R f 191 are preferably perfluoroalkylene groups having 1 to 5 carbon atoms.
• R 181 is preferably a hydrogen atom.
• X 201 is preferably a cyano group, an alkoxycarbonyl group, an iodine atom, a bromine atom, or -CH 2 I.
• X 211 is preferably a cyano group, an alkoxycarbonyl group, an iodine atom, a bromine atom, or -CH 2 OH.
• the above fluoromonomer and a fluorine-free monomer may be polymerized.
• the fluorine-free monomer include hydrocarbon monomers that are reactive with the fluoromonomer.
• the hydrocarbon monomers include alkenes such as ethylene, propylene, butylene, and isobutylene; alkyl vinyl ethers such as ethyl vinyl ether, propyl vinyl ether, butyl vinyl ether, isobutyl vinyl ether, and cyclohexyl vinyl ether; vinyl acetate, vinyl propionate, n - Vinyl butyrate, vinyl isobutyrate, vinyl valerate, vinyl pivalate, vinyl caproate, vinyl caprylate, vinyl caprate, vinyl versatate, vinyl laurate, vinyl myristate, vinyl palmitate, vinyl stearate, benzoic acid Vinyl, vinyl para-t-butylbenzoate, vinyl cyclohexanecarboxylate, vinyl monochloro
• the fluorine-free monomer may also be a functional group-containing hydrocarbon monomer (excluding monomers that provide crosslinking sites).
• the functional group-containing hydrocarbon monomer include hydroxyalkyl vinyl ethers such as hydroxyethyl vinyl ether, hydroxypropyl vinyl ether, hydroxybutyl vinyl ether, hydroxyisobutyl vinyl ether, and hydroxycyclohexyl vinyl ether; acrylic acid, methacrylic acid, itaconic acid, and succinic acid.
• desired fluoropolymer particles can be obtained by polymerizing one or more of the above fluoromonomers.
• the amount of polymer (I) added in the above polymerization is preferably more than 0.02% by mass and 10% by mass or less, and a more preferable upper limit is 1% by mass or less, based on the aqueous medium. By adjusting the amount of polymer (I) added within the above range, the polymerization of the fluoromonomer in the aqueous medium can proceed smoothly.
• the amount of polymer (I) added is the total amount of polymer (I) added in the above polymerization.
• the polymer (I) may be added all at once, or the polymer (I) may be added continuously. Continuously adding the polymer (I) means, for example, adding the polymer (I) not all at once but over time and without interruption or in portions.
• an aqueous solution containing polymer (I) and water may be prepared and added.
• addition of the polymer (I) is started before the solid content of the fluoropolymer formed in the aqueous medium reaches 0.5% by mass, and thereafter the addition of the polymer (I) is continued. It is preferable to add it.
• the timing to start adding the polymer (I) is preferably before the solid content of the fluoropolymer reaches 0.3% by mass, more preferably before it reaches 0.2% by mass, and still more preferably This is before the amount reaches 0.1% by mass, and particularly preferably at the same time as the initiation of polymerization.
• the above solids content is the content of fluoropolymer based on the sum of aqueous medium and fluoropolymer.
• polymer (I) if at least one type of polymer (I) is used, it is possible to efficiently produce a fluoropolymer.
• two or more compounds included in the polymer (I) may be used at the same time, and as long as they are volatile or may remain in a molded article made of a fluoropolymer, the polymer (I) may be used simultaneously. Compounds having surfactant ability other than I) may be used simultaneously.
• a nucleating agent may be used.
• the amount of the nucleating agent added can be appropriately selected depending on the type of nucleating agent.
• the amount of the nucleating agent added to the aqueous medium may be 5000 mass ppm or less, preferably 1000 mass ppm or less, more preferably 500 mass ppm or less, and even more preferably 100 mass ppm. or less, particularly preferably 50 mass ppm or less, and most preferably 10 mass ppm or less.
• the nucleating agent it is preferable to add the nucleating agent to the aqueous medium before the start of the polymerization or before the solid content of the fluoropolymer formed in the aqueous medium reaches 5.0% by mass.
• the amount of the nucleating agent added at the initial stage of polymerization is preferably 0.001% by mass or more, more preferably 0.01% by mass or more, and even more preferably 0.05% by mass, based on the fluoropolymer obtained. It is at least 0.1% by mass, particularly preferably at least 0.1% by mass. Although the upper limit of the amount of the nucleating agent added at the initial stage of polymerization is not limited, it is, for example, 2000% by mass.
• a fluoropolymer having a smaller primary particle size is obtained compared to carrying out the polymerization in the absence of the nucleating agent.
• nucleating agent examples include dicarboxylic acids, perfluoropolyether (PFPE) acids or salts thereof, and hydrocarbon-containing surfactants.
• PFPE perfluoropolyether
• the nucleating agent preferably does not contain an aromatic ring and is preferably an aliphatic compound.
• the above nucleating agent is preferably added before or simultaneously with the addition of the polymerization initiator, but the particle size distribution can also be adjusted by adding it during the polymerization.
• a preferred amount of the dicarboxylic acid is 1000 mass ppm or less, a more preferred amount is 500 mass ppm or less, and an even more preferred amount is 100 mass ppm or less, based on the aqueous medium.
• the perfluoropolyether (PFPE) acid or its salt may have any chain structure in which oxygen atoms in the main chain of the molecule are separated by saturated fluorocarbon groups having 1 to 3 carbon atoms. . Also, two or more types of fluorocarbon groups may be present in the molecule.
• a typical structure has a repeating unit represented by the following formula: (-CFCF 3 -CF 2 -O-) n (VII) (-CF 2 -CF 2 -CF 2 -O-) n (VIII) (-CF 2 -CF 2 -O-) n -(-CF 2 -O-) m (IX) (-CF 2 -CFCF 3 -O-)n-(-CF 2 -O-) m (X)
• the PFPE acid or salt thereof may have a carboxylic acid group or a salt thereof at one or both ends.
• the PFPE acid or salt thereof may also have a sulfonic acid, phosphonic acid group, or a salt thereof at one or both ends.
• the above-mentioned PFPE acid or its salt may have different groups at each end.
• the other end of the molecule is usually perfluorinated, but may contain hydrogen or chlorine atoms.
• the PFPE acid or salt thereof has at least 2 ether oxygens, preferably at least 4 ether oxygens, even more preferably at least 6 ether oxygens.
• at least one of the fluorocarbon groups separating the ether oxygens more preferably at least two of such fluorocarbon groups, has 2 or 3 carbon atoms. Even more preferably, at least 50% of the fluorocarbon groups separating the ether oxygens have 2 or 3 carbon atoms.
• the PFPE acid or salt thereof has a total of at least 15 carbon atoms, eg, a preferred minimum value of n or n+m in the repeating unit structure is at least 5. Two or more of the above PFPE acids or salts thereof having acid groups at one or both ends can be used in the manufacturing method of the present disclosure.
• the PFPE acid or salt thereof preferably has a number average molecular weight of less than 6000 g/mol.
• the amount of the hydrocarbon-containing surfactant added to the aqueous medium is preferably 40 mass ppm or less, more preferably 30 mass ppm or less, and even more preferably 20 mass ppm or less. It is presumed that the ppm amount of lipophilic nucleation sites present in the aqueous medium is less than the amount added. Therefore, the amounts of the lipophilic nucleation sites are smaller than the 40 mass ppm, 30 mass ppm, and 20 mass ppm, respectively. Since the lipophilic nucleation sites are believed to exist as molecules, even a small amount of the hydrocarbon-containing surfactant can generate large amounts of lipophilic nucleation sites. Therefore, beneficial effects can be obtained even by adding about 1 mass ppm of the hydrocarbon-containing surfactant to an aqueous medium. A preferable lower limit is 0.01 mass ppm.
• hydrocarbon-containing surfactants include siloxane surfactants such as those disclosed in U.S. Pat. No. 7,897,682 (Brothers et al.) and U.S. Pat. No. 7,977,438 (Brothers et al.). , nonionic surfactants and cationic surfactants.
• a nonionic surfactant for example, a nonionic hydrocarbon surfactant
• a nonionic hydrocarbon surfactant is preferable. That is, as the nucleating agent, a nonionic surfactant is preferable.
• the nonionic surfactant preferably does not contain aromatic moieties.
• Nonionic surfactants usually do not contain charged groups and have hydrophobic moieties that are long chain hydrocarbons.
• the hydrophilic portion of the nonionic surfactant contains water-soluble functional groups such as ethylene ether chains derived from polymerization with ethylene oxide.
• nonionic surfactants include the following. Polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene alkyl ester, sorbitan alkyl ester, polyoxyethylene sorbitan alkyl ester, glycerol ester, derivatives thereof.
• polyoxyethylene alkyl ether polyoxyethylene lauryl ether, polyoxyethylene cetyl ether, polyoxyethylene stearyl ether, polyoxyethylene oleyl ether, polyoxyethylene behenyl ether, etc.
• polyoxyethylene alkylphenyl ether polyoxyethylene nonylphenyl ether, polyoxyethylene octylphenyl ether, etc.
• polyoxyethylene alkyl esters polyethylene glycol monolaurate, polyethylene glycol monooleate, polyethylene glycol monostearate, etc.
• sorbitan alkyl esters polyoxyethylene sorbitan monolaurylate, polyoxyethylene sorbitan monopalmitate, polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan monooleate, etc.
• polyoxyethylene sorbitan alkyl esters polyoxyethylene sorbitan monolaurylate, polyoxyethylene sorbitan monopalmitate, polyoxyethylene sorbitan monostearate, etc.
• glycerol esters glycerol monomyristate, glycerol monostearate, glycerol monooleate, etc.
• polyoxyethylene alkylamine polyoxyethylene alkylphenyl-formaldehyde condensate, polyoxyethylene alkyl ether phosphate, etc.
• the above ethers and esters may have an HLB value of 10-18.
• nonionic surfactants include Triton (registered trademark) X series (X15, X45, -6, TMN-10, TMN-100, etc.), Tergitol (registered trademark) L series, BASF Pluronic (registered trademark) R series (31R1, 17R2, 10R5, 25R4 (m ⁇ 22, n ⁇ 23), Examples include Iconol (registered trademark) TDA series (TDA-6, TDA-9, TDA-10).
• the nonionic surfactant is preferably a nonionic surfactant that does not contain fluorine.
• ether-type nonionic surfactants such as polyoxyethylene alkylphenyl ether, polyoxyethylene alkyl ether, and polyoxyethylene alkylene alkyl ether; polyoxyethylene derivatives such as ethylene oxide/propylene oxide block copolymers; sorbitan fatty acids
• Ester type nonionic surfactants such as ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene sorbitol fatty acid ester, glycerin fatty acid ester, polyoxyethylene fatty acid ester
• amine type nonionic surfactants such as polyoxyethylene alkylamine and alkyl alkanolamide Examples include ionic surfactants; and the like.
• the hydrophobic group may be any of an alkylphenol group, a straight-chain alkyl group, and a branched alkyl group.
• nonionic surfactant a nonionic surfactant represented by general formula (i) is preferred.
• R 6 -O-A 1 -H (i) (In the formula, R 6 is a linear or branched primary or secondary alkyl group having 8 to 18 carbon atoms, and A 1 is a polyoxyalkylene chain.)
• the number of carbon atoms in R 6 is preferably 10 to 16, more preferably 12 to 16.
• the number of carbon atoms in R 6 is 18 or less, excellent sedimentation stability of the composition is likely to be obtained. Furthermore, when the number of carbon atoms in R 6 exceeds 18, the flow temperature is high, making it difficult to handle.
• the number of carbon atoms in R 6 is less than 8, the surface tension of the composition becomes high, and the permeability and wettability tend to decrease.
• the polyoxyalkylene chain of A1 may consist of oxyethylene and oxypropylene. It is a polyoxyalkylene chain consisting of an average repeating number of oxyethylene groups of 5 to 20 and an average repeating number of oxypropylene groups of 0 to 2, and is a hydrophilic group.
• the number of oxyethylene units can include either the broad or narrow unimodal distribution normally provided, or the broader or bimodal distribution obtained by blending. When the average repeating number of oxypropylene groups is more than 0, the oxyethylene groups and oxypropylene groups in the polyoxyalkylene chain may be arranged in blocks or randomly.
• a polyoxyalkylene chain composed of an average repeating number of oxyethylene groups of 7 to 12 and an average repeating number of oxypropylene groups of 0 to 2 is preferred.
• a 1 has an average of 0.5 to 1.5 oxypropylene groups because low foaming properties are good.
• R 6 is (R')(R'')HC-, where R' and R'' are the same or different linear, branched, or cyclic alkyl groups. and the total amount of carbon atoms is at least 5, preferably 7 to 17.
• at least one of R' or R'' is a branched or cyclic hydrocarbon group.
• polyoxyethylene alkyl ether examples include C 13 H 27 -O-(C 2 H 4 O) n -H, C 12 H 25 -O-(C 2 H 4 O) n -H, C 10 H 21 CH(CH 3 )CH 2 -O-(C 2 H 4 O) n -H, C 13 H 27 -O-(C 2 H 4 O) n -(CH(CH 3 )CH 2 O)- H, C 16 H 33 -O-(C 2 H 4 O) n -H, HC(C 5 H 11 )(C 7 H 15 )-O-(C 2 H 4 O) n -H (in each formula , n is an integer of 1 or more).
• polyoxyethylene alkyl ethers include, for example, the Genapol X series (manufactured by Clariant), exemplified by Genapol (Manufactured by Ichi Kogyo Seiyaku Co., Ltd.), Rheocol TD series (manufactured by Lion Corporation) including Rheocol TD-90 (trade name), Lionol (registered trademark) TD series (manufactured by Lion Corporation), and T-Det A138 (trade name). Examples include T-Det A series (manufactured by Harcros Chemicals) and Tergitol (registered trademark) 15-S series (manufactured by Dow Chemical).
• the nonionic surfactant is an ethoxylate of 2,6,8-trimethyl-4-nonanol having an average of about 4 to about 18 ethylene oxide units, 2,6,8-trimethyl-4-nonanol having an average of about 6 to about 12 ethylene oxide units, Also preferred is ethoxylate of 6,8-trimethyl-4-nonanol, or a mixture thereof.
• Nonionic surfactants of this type are also commercially available, for example, as TERGITOL TMN-6, TERGITOL TMN-10, and TERGITOL TMN-100X (all trade names manufactured by The Dow Chemical Company).
• the hydrophobic group of the nonionic surfactant may be any one of an alkylphenol group, a straight-chain alkyl group, and a branched alkyl group.
• a nonionic surfactant for example, general formula (ii) R 7 -C 6 H 4 -O-A 2 -H (ii) (In the formula, R 7 is a linear or branched alkyl group having 4 to 12 carbon atoms, and A 2 is a polyoxyalkylene chain.)
• R 7 is a linear or branched alkyl group having 4 to 12 carbon atoms
• a 2 is a polyoxyalkylene chain.
• Specific examples of the nonionic surfactant include Triton X-100 (trade name, manufactured by Dow Chemical Company).
• the polyoxyalkylene chain of A2 may consist of oxyethylene and oxypropylene. It is a polyoxyalkylene chain consisting of an average repeating number of oxyethylene groups of 5 to 20 and an average repeating number of oxypropylene groups of 0 to 2, and is a hydrophilic group.
• the number of oxyethylene units can include either the broad or narrow unimodal distribution normally provided, or the broader or bimodal distribution obtained by blending. When the average repeating number of oxypropylene groups is more than 0, the oxyethylene groups and oxypropylene groups in the polyoxyalkylene chain may be arranged in blocks or randomly.
• a polyoxyalkylene chain composed of an average repeating number of oxyethylene groups of 7 to 12 and an average repeating number of oxypropylene groups of 0 to 2 is preferred.
• a 2 has an average of 0.5 to 1.5 oxypropylene groups because low foaming properties are achieved.
• R 7 is a primary or secondary alkyl group, more preferably (R')(R'')HC-, where R' and R'' are the same or Different straight-chain, branched-chain or cyclic alkyl groups, the total amount of carbon atoms being at least 5, preferably from 7 to 17.
• R' or R'' is a branched or cyclic hydrocarbon group.
• nonionic surfactants examples include polyol compounds. Specifically, examples include those described in International Publication No. 2011/014715.
• Typical examples of polyol compounds include compounds having one or more sugar units as polyol units. The sugar unit may be modified to contain at least one long chain. Suitable polyol compounds containing at least one long chain moiety include, for example, alkyl glycosides, modified alkyl glycosides, sugar esters, and combinations thereof.
• Sugars include, but are not limited to, monosaccharides, oligosaccharides, and sorbitans. Monosaccharides include pentose and hexose.
• Typical examples of monosaccharides include ribose, glucose, galactose, mannose, fructose, arabinose, and xylose.
• Oligosaccharides include oligomers of 2 to 10 identical or different monosaccharides. Examples of oligosaccharides include, but are not limited to, sucrose, maltose, lactose, raffinose, and isomaltose.
• sugars suitable for use as polyol compounds include five-membered rings of four carbon atoms and one heteroatom (typically oxygen or sulfur, but preferably oxygen). or a six-membered ring of five carbon atoms and one heteroatom as described above, preferably an oxygen atom. They further contain at least two or at least three hydroxy groups (--OH groups) attached to the carbon ring atoms.
• the sugar is a hydrogen atom of a hydroxy group (and/or hydroxyalkyl group) attached to a carbon ring atom such that an ether or ester bond is created between the long chain residue and the sugar moiety. are modified in that one or more of them are replaced by long chain residues.
• Sugar-based polyols may contain one sugar unit or multiple sugar units.
• the sugar unit or sugar units may be modified with long chain moieties as described above.
• Specific examples of sugar-based polyol compounds include glycosides, sugar esters, sorbitan esters, and mixtures and combinations thereof.
• a preferred type of polyol compound is an alkyl or modified alkyl glucoside.
• These types of surfactants contain at least one glucose moiety. (wherein x represents 0, 1, 2, 3, 4, or 5 and R 1 and R 2 independently represent H or a long chain unit containing at least 6 carbon atoms. , provided that at least one of R 1 and R 2 is not H).
• Typical examples of R 1 and R 2 include aliphatic alcohol residues.
• aliphatic alcohols examples include hexanol, heptanol, octanol, nonanol, decanol, undecanol, dodecanol (lauryl alcohol), tetradecanol, hexadecanol (cetyl alcohol), heptadecanol, octadecanol (stearyl alcohol), eicosanoic acid, and combinations thereof.
• the above formula represents a specific example of an alkyl polyglucoside that represents the pyranose form of glucose, it is understood that other sugars or sugars that are the same sugar but in different enantiomeric or diastereomeric forms may also be used. be understood.
• Alkyl glucosides are obtainable, for example, by the acid-catalyzed reaction of glucose, starch, or n-butyl glucoside with aliphatic alcohols, from which mixtures of various alkyl glucosides are typically obtained (Alkylpolygylcoside, Rompp. , Lexikon Chemie, Version 2.0, Stuttgart/New York, Georg Thieme Verlag, 1999).
• aliphatic alcohols examples include hexanol, heptanol, octanol, nonanol, decanol, undecanol, dodecanol (lauryl alcohol), tetradecanol, hexadecanol (cetyl alcohol), heptadecanol, octadecanol (stearyl alcohol), eicosanoic acid, and combinations thereof.
• Alkyl glucosides are also commercially available from Cognis GmbH, Dusseldorf, Germany under the trade name GLUCOPON or DISPONIL.
• nonionic surfactants include difunctional block copolymers supplied by BASF as the Pluronic® R series and tridecyl alcohol alkoxylates supplied by BASF as the Iconol® TDA series. Can be mentioned.
• the nonionic surfactant is selected from the group consisting of a nonionic surfactant represented by general formula (i) and a nonionic surfactant represented by general formula (ii). At least one kind is preferable, and a nonionic surfactant represented by general formula (i) is more preferable.
• the above-mentioned nonionic surfactant preferably does not contain an aromatic moiety.
• a compound having a functional group and a hydrophilic group that can react in radical polymerization may be used together with the polymer (I).
• the compound having a functional group capable of reacting with radical polymerization and a hydrophilic group the same compound as the modified monomer (A) described below can be used.
• additives can be used to stabilize each compound.
• the additives include buffers, pH adjusters, stabilizing agents, and dispersion stabilizers.
• paraffin wax paraffin wax, fluorinated oil, fluorinated solvent, silicone oil, etc. are preferred.
• the stabilizing aids may be used alone or in combination of two or more.
• paraffin wax is more preferred.
• the paraffin wax may be liquid, semi-solid, or solid at room temperature, but saturated hydrocarbons having 12 or more carbon atoms are preferred.
• the melting point of paraffin wax is usually preferably 40 to 65°C, more preferably 50 to 65°C.
• the amount of the stabilizing aid used is preferably 0.1 to 12% by mass, more preferably 0.1 to 8% by mass, based on the mass of the aqueous medium used. It is desirable that the stabilizing aid be sufficiently hydrophobic and completely separated from the aqueous dispersion after polymerization so that it does not become a contaminating component.
• the above polymerization is carried out by charging an aqueous medium, polymer (I), monomer, and other additives as necessary into a polymerization reactor, stirring the contents of the reactor, and maintaining the reactor at a predetermined polymerization temperature. Then, a predetermined amount of polymerization initiator is added to initiate the polymerization reaction. After the start of the polymerization reaction, monomers, polymerization initiators, chain transfer agents, polymer (I), etc. may be additionally added depending on the purpose. Polymer (I) may be added after the polymerization reaction has started.
• the polymerization temperature is 5 to 120°C
• the polymerization pressure is 0.05 to 10 MPaG.
• the polymerization temperature and polymerization pressure are appropriately determined depending on the type of monomer used, the desired molecular weight of the fluoropolymer, and the reaction rate.
• the polymerization initiator is not particularly limited as long as it can generate radicals within the polymerization temperature range, and any known oil-soluble and/or water-soluble polymerization initiators can be used. Furthermore, polymerization can also be initiated as redox in combination with a reducing agent or the like. The concentration of the polymerization initiator is appropriately determined depending on the type of monomer, the molecular weight of the desired fluoropolymer, and the reaction rate.
• an oil-soluble radical polymerization initiator or a water-soluble radical polymerization initiator can be used as the polymerization initiator.
• the oil-soluble radical polymerization initiator may be a known oil-soluble peroxide, such as dialkyl peroxycarbonates such as diisopropyl peroxydicarbonate, disec-butylperoxydicarbonate, t-butylperoxycarbonate, etc.
• Peroxy esters such as isobutyrate, t-butylperoxypivalate, dialkyl peroxides such as di-t-butyl peroxide, etc.
• the water-soluble radical polymerization initiator may be a known water-soluble peroxide, such as ammonium salts, potassium salts, and sodium salts such as persulfuric acid, perboric acid, perchloric acid, perphosphoric acid, and percarbonate. , organic peroxides such as disuccinic acid peroxide and diglutaric acid peroxide, t-butyl permaleate, and t-butyl hydroperoxide. A reducing agent such as sulfites may also be included, and the amount used may be 0.1 to 20 times that of the peroxide.
• a reducing agent such as sulfites may also be included, and the amount used may be 0.1 to 20 times that of the peroxide.
• a redox initiator that combines an oxidizing agent and a reducing agent as the polymerization initiator.
• the oxidizing agent include persulfates, organic peroxides, potassium permanganate, manganese triacetate, cerium ammonium nitrate, and the like.
• the reducing agent include sulfites, bisulfites, bromates, diimines, oxalic acid, and the like.
• persulfates include ammonium persulfate and potassium persulfate.
• sulfites include sodium sulfite and ammonium sulfite.
• a copper salt or an iron salt to the redox initiator combination.
• the copper salt include copper(II) sulfate
• the iron salt include iron(II) sulfate.
• the redox initiator examples include potassium permanganate/oxalic acid, ammonium persulfate/bisulfite/iron sulfate, manganese triacetate/oxalic acid, cerium ammonium nitrate/oxalic acid, bromate/bisulfite, etc. potassium permanganate/oxalic acid is preferred.
• potassium permanganate/oxalic acid either an oxidizing agent or a reducing agent may be charged into a polymerization tank in advance, and then the other may be added continuously or intermittently to initiate polymerization.
• potassium permanganate/oxalic acid it is preferable to charge the oxalic acid into a polymerization tank and continuously add potassium permanganate thereto.
• the amount of the polymerization initiator added is not particularly limited, but it may be added in an amount that does not significantly reduce the polymerization rate (for example, several ppm to water concentration) or more at the beginning of the polymerization, either all at once, sequentially, or continuously. Just add it.
• the upper limit is a range in which the reaction temperature can be raised while removing heat from the polymerization reaction from the equipment surface, and a more preferable upper limit is a range in which the polymerization reaction heat can be removed from the equipment surface.
• the above-mentioned aqueous medium is a reaction medium in which polymerization is carried out, and means a liquid containing water.
• the aqueous medium is not particularly limited as long as it contains water, and may include water and a fluorine-free organic solvent such as alcohol, ether, or ketone, and/or a fluorine-containing organic solvent with a boiling point of 40°C or less. It may also include.
• a known chain transfer agent, radical scavenger, or decomposition agent may be added to adjust the polymerization rate and molecular weight.
• chain transfer agent examples include esters such as dimethyl malonate, diethyl malonate, methyl acetate, ethyl acetate, butyl acetate, and dimethyl succinate, as well as isopentane, methane, ethane, propane, methanol, isopropanol, acetone, and various Examples include mercaptan, various halogenated hydrocarbons such as carbon tetrachloride, and cyclohexane.
• Bromine or iodine compounds may be used as chain transfer agents.
• Examples of the polymerization method using a bromine compound or an iodine compound include a method of polymerizing a fluoromonomer in an aqueous medium in the presence of a bromine compound or an iodine compound in a substantially oxygen-free state ( Iodine transfer polymerization method).
• Typical examples of the bromine compound or iodine compound to be used include, for example, the general formula: R a I x Bry (In the formula, x and y are each an integer of 0 to 2 and satisfy 1 ⁇ x+y ⁇ 2, and R a is a saturated or unsaturated fluorohydrocarbon group having 1 to 16 carbon atoms or a chlorofluorocarbon group. Examples include compounds represented by a hydrocarbon group or a hydrocarbon group having 1 to 3 carbon atoms, which may contain an oxygen atom.
• bromine or iodine compounds iodine or bromine is introduced into the polymer and acts as a crosslinking point.
• bromine compound or iodine compound examples include 1,3-diiodoperfluoropropane, 2-iodoperfluoropropane, 1,3-diiodo-2-chloroperfluoropropane, 1,4-diiodoperfluorobutane, 1 , 5-diiodo-2,4-dichloroperfluoropentane, 1,6-diiodoperfluorohexane, 1,8-diiodoperfluorooctane, 1,12-diiodoperfluorododecane, 1,16-diiodo Perfluorohexadecane, diiodomethane, 1,2-diiodoethane, 1,3-diiodo-n-propane, CF 2 Br 2 , BrCF 2 CF 2 Br, CF 3 CFBrCF 2 Br, CFClBr 2 , BrCF
• 1,4-diiodoperfluorobutane, 1,6-diiodoperfluorohexane, and 2-iodoperfluoropropane are preferred from the viewpoint of polymerization reactivity, crosslinking reactivity, and easy availability. is preferred.
• the amount of the chain transfer agent used is usually 1 to 50,000 mass ppm, preferably 1 to 20,000 mass ppm, based on the total amount of fluoromonomer supplied.
• the chain transfer agent mentioned above may be added all at once into the reaction vessel before the start of polymerization, may be added all at once after the start of polymerization, or may be added in multiple portions during polymerization. Alternatively, it may be added continuously during the polymerization.
• persulfates for example, ammonium persulfate
• organic peroxides such as disuccinic acid peroxide
• diglutaric acid peroxide can be used alone or in the form of a mixture thereof. Further, it may be used in combination with a reducing agent such as sodium sulfite to form a redox system.
• a radical scavenger such as hydroquinone or catechol may be added, or a peroxide decomposer such as ammonium sulfite may be added to adjust the radical concentration within the system.
• a fluoromonomer is polymerized in an aqueous medium in the presence of polymer (I) to produce an aqueous dispersion of fluoropolymer particles, and in the aqueous dispersion of fluoropolymer particles, the fluoromonomer is
• the fluoropolymer may be obtained by seed polymerizing the fluoropolymer particles with fluoropolymer particles.
• the above polymerization is preferably one in which the fluoromonomer is polymerized in the substantial absence of a fluorine-containing surfactant (excluding compounds having a functional group and a hydrophilic group that can react in radical polymerization).
• a fluorine-containing surfactant excluding compounds having a functional group and a hydrophilic group that can react in radical polymerization.
• fluorosurfactants have been used for polymerization of fluoromonomers in aqueous media, but according to the production method of the present disclosure, fluoropolymer polymers can be polymerized even when fluoromonomers are not used. can be obtained.
• substantially in the absence of a fluorine-containing surfactant means that the amount of the fluorine-containing surfactant relative to the aqueous medium is 10 mass ppm or less.
• the amount of the fluorine-containing surfactant in the aqueous medium is preferably 1 ppm by mass or less, more preferably 100 ppb by mass or less, still more preferably 10 ppb by mass or less, and even more preferably 1 ppb by mass or less. It is.
• fluorine-containing surfactant examples include anionic fluorine-containing surfactants.
• the anionic fluorine-containing surfactant may be, for example, a surfactant containing fluorine atoms having a total carbon number of 20 or less in the portion excluding the anionic group.
• the fluorine-containing surfactant may also be a fluorine-containing surfactant whose anionic moiety has a molecular weight of 1000 or less.
• anionic moiety means a moiety of the above-mentioned fluorine-containing surfactant excluding cations.
• F(CF 2 ) n1 COOM expressed by formula (I) described later, it is the part "F(CF 2 ) n1 COO”.
• the fluorine-containing surfactant mentioned above also includes a fluorine-containing surfactant having a LogPOW of 3.5 or less.
• the above LogPOW is the partition coefficient between 1-octanol and water, and the LogP [where P is in octanol when the octanol/water (1:1) mixture containing a fluorine-containing surfactant undergoes phase separation. is represented by the ratio of fluorine-containing surfactant concentration/fluorine-containing surfactant concentration in water].
• fluorine-containing surfactants include U.S. Patent Application Publication No. 2007/0015864, U.S. Patent Application Publication No. 2007/0015865, U.S. Patent Application Publication No. 2007/0015866, and U.S. Patent Application Publication No. 2007/0015866, Published Application No. 2007/0276103, US Patent Application No. 2007/0117914, US Patent Application No. 2007/0142541, US Patent Application No. 2008/0015319, US Patent No. 3,250,808 specification, US Patent No. 3271341, JP 2003-119204, WO 2005/042593, WO 2008/060461, WO 2007/046377, JP 2007-119526 Publications, International Publication No. 2007/046482, International Publication No. 2007/046345, US Patent Application Publication No. 2014/0228531, International Publication No. 2013/189824, International Publication No. 2013/189826, etc. Can be mentioned.
• the anionic fluorine-containing surfactant has the following general formula (N 0 ): X n0 - Rf n0 - Y 0 (N 0 ) (In the formula, X n0 is H, Cl , or The compound represented by is an alkylene group, and the alkylene group may contain one or more ether bonds, and some H may be substituted with Cl.Y0 is an anionic group. Can be mentioned. The anionic group of Y 0 may be -COOM, -SO 2 M, or -SO 3 M, and may be -COOM or -SO 3 M.
• M is H, a metal atom, NR 7 4 , imidazolium which may have a substituent, pyridinium which may have a substituent, or phosphonium which may have a substituent, and R 7 is H or an organic group.
• the metal atoms include alkali metals (Group 1), alkaline earth metals (Group 2), and examples thereof include Na, K, and Li.
• R 7 may be H or a C 1-10 organic group, H or a C 1-4 organic group, or H or a C 1-4 alkyl group.
• M may be H, a metal atom or NR74 , and may be H, an alkali metal (group 1), an alkaline earth metal (group 2) or NR74 , H , Na, K, Li or It may be NH4 .
• Rf n0 50% or more of H may be substituted with fluorine.
• N 1 X n0 - (CF 2 ) m1 - Y 0 (N 1 )
• X n0 is H, Cl and F
• m1 is an integer from 3 to 15, and Y 0 is as defined above
• N 2 a compound represented by the following general formula (N 2 ): Rf n1 -O-(CF(CF 3 )CF 2 O) m2 CFX n1 -Y 0 (N 2 )
• Rf n1 is a perfluoroalkyl group having 1 to 5 carbon atoms
• m2 is an integer of 0 to 3
• X n1 is F or CF 3
• Y 0 is as defined above.
• N 3 a compound represented by the following general formula (N 3 ): Rf n2 (CH 2 ) m3 - (Rf n3 ) q - Y 0 (N 3 )
• Rf n2 is a partially or fully fluorinated alkyl group having 1 to 13 carbon atoms and may contain an ether bond
• m3 is an integer of 1 to 3
• Rf n3 is a linear or a branched perfluoroalkylene group having 1 to 3 carbon atoms
• q is 0 or 1
• Y 0 is as defined above
• N 4 a compound represented by the following general formula (N 4 ) : Rf n4 -O-(CY n1 Y n2 ) p CF 2 -Y 0 (N 4 )
• Rf n4 is a linear or branched moiety or a fully fluorinated alkyl group that may contain an ether bond and/or a chlorine atom having
• Rf n5 is a linear or branched moiety having 1 to 3 carbon atoms that may contain an ether bond or a fully fluorinated alkylene group, and L is a linking group.
• Y 0 are as defined above. However, the total carbon number of X n2 , X n3 , X n4 and Rf n5 is 18 or less.
• the compound represented by the above general formula (N 0 ) includes perfluorocarboxylic acid (I) represented by the following general formula (I), ⁇ -H represented by the following general formula (II) Perfluorocarboxylic acid (II), perfluoroether carboxylic acid (III) represented by the following general formula (III), perfluoroalkylalkylenecarboxylic acid (IV) represented by the following general formula (IV), the following general formula Perfluoroalkoxyfluorocarboxylic acid (V) represented by (V), perfluoroalkyl sulfonic acid (VI) represented by the following general formula (VI), ⁇ -H perfluorocarboxylic acid (VI) represented by the following general formula (VII), Fluorosulfonic acid (VII), perfluoroalkylalkylene sulfonic acid (VIII) represented by the following general formula (VIII), alkylalkylenecarboxylic acid (IX) represented by the following general formula (IX
• the above perfluorocarboxylic acid (I) has the following general formula (I) F (CF 2 ) n1 COOM (I) (In the formula, n1 is an integer of 3 to 14, M is H, a metal atom, NR 7 4 , imidazolium which may have a substituent, pyridinium which may have a substituent, or It is a phosphonium which may have a substituent, and R 7 is H or an organic group.
• ⁇ -H perfluorocarboxylic acid has the following general formula (II) H(CF 2 ) n2 COOM (II) (In the formula, n2 is an integer from 4 to 15, and M is as defined above.)
• the above perfluoroether carboxylic acid (III) has the following general formula (III) Rf 1 -O-(CF(CF 3 )CF 2 O) n3 CF(CF 3 )COOM (III) (In the formula, Rf 1 is a perfluoroalkyl group having 1 to 5 carbon atoms, n3 is an integer of 0 to 3, and M is as defined above.) .
• the above perfluoroalkylalkylenecarboxylic acid (IV) has the following general formula (IV) Rf 2 (CH 2 ) n4 Rf 3 COOM (IV) (In the formula, Rf 2 is a perfluoroalkyl group having 1 to 5 carbon atoms, Rf 3 is a linear or branched perfluoroalkylene group having 1 to 3 carbon atoms, and n4 is a perfluoroalkyl group having 1 to 3 carbon atoms. is an integer, and M is defined above.).
• the above alkoxyfluorocarboxylic acid (V) has the following general formula (V) Rf 4 -O-CY 1 Y 2 CF 2 -COOM (V) (In the formula, Rf 4 is a linear or branched moiety or a fully fluorinated alkyl group that may contain an ether bond and/or a chlorine atom having 1 to 12 carbon atoms, and Y 1 and Y 2 are , the same or different, are H or F, and M is as defined above.
• the above perfluoroalkyl sulfonic acid has the following general formula (VI) F( CF2 ) n5SO3M ( VI) (In the formula, n5 is an integer from 3 to 14, and M is as defined above.)
• ⁇ -H perfluorosulfonic acid has the following general formula (VII) H(CF 2 ) n6 SO 3 M (VII) (In the formula, n6 is an integer from 4 to 14, and M is as defined above.)
• the above perfluoroalkylalkylene sulfonic acid (VIII) has the following general formula (VIII): Rf5 ( CH2 ) n7SO3M ( VIII) (In the formula, Rf 5 is a perfluoroalkyl group having 1 to 13 carbon atoms, n7 is an integer of 1 to 3, and M is as defined above.) .
• the above alkyl alkylene carboxylic acid (IX) has the following general formula (IX) Rf 6 (CH 2 ) n8 COOM (IX) (wherein Rf 6 is a linear or branched moiety or a fully fluorinated alkyl group having 1 to 13 carbon atoms that may contain an ether bond, and n8 is an integer of 1 to 3; M is defined above.).
• the above fluorocarboxylic acid (X) has the following general formula (X) Rf 7 -O-Rf 8 -O-CF 2 -COOM (X) (In the formula, Rf 7 is a linear or branched moiety or a fully fluorinated alkyl group having 1 to 6 carbon atoms that may contain an ether bond and/or a chlorine atom, and Rf 8 is a fully fluorinated alkyl group having 1 to 6 carbon atoms. 1 to 6 linear or branched moieties or fully fluorinated alkyl groups, where M is as defined above.
• the above alkoxyfluorosulfonic acid (XI) has the following general formula (XI) Rf 9 -O-CY 1 Y 2 CF 2 -SO 3 M (XI) (wherein, Rf 9 is a linear or branched alkyl group having 1 to 12 carbon atoms that may contain an ether bond, and may contain chlorine, and is partially or fully fluorinated; Y 1 and Y 2 are the same or different and are H or F, and M is as defined above.
• the above compound (XII) has the following general formula (XII): (In the formula, X 1 , X 2 and Rf 10 is a perfluoroalkylene group having 1 to 3 carbon atoms, L is a linking group, and Y 0 is an anionic group. Y 0 may be -COOM, -SO 2 M, or -SO 3 M, and may be -SO 3 M or COOM, where M is as defined above. Examples of L include a single bond, a moiety containing an ether bond having 1 to 10 carbon atoms, or a fully fluorinated alkylene group.
• the above compound (XIII) has the following general formula (XIII): Rf 11 -O-(CF 2 CF(CF 3 )O) n9 (CF 2 O) n10 CF 2 COOM (XIII) (In the formula, Rf 11 is a fluoroalkyl group containing chlorine and having 1 to 5 carbon atoms, n9 is an integer of 0 to 3, n10 is an integer of 0 to 3, and M is as defined above. ).
• Compound (XIII) is CF2ClO ( CF2CF ( CF3 )O) n9 ( CF2O ) n10CF2COONH4 (a mixture with an average molecular weight of 750 , where n9 and n10 are as defined above . ).
• anionic fluorine-containing surfactant examples include carboxylic acid surfactants, sulfonic acid surfactants, and the like.
• the fluorine-containing surfactant may be one type of fluorine-containing surfactant, or may be a mixture containing two or more types of fluorine-containing surfactants.
• fluorine-containing surfactant examples include compounds represented by the following formula.
• the fluorine-containing surfactant may be a mixture of these compounds.
• the fluoromonomer is polymerized substantially in the absence of a compound represented by the following formula.
• an aqueous dispersion containing the above fluoropolymer can be obtained.
• the concentration of the fluoropolymer is usually 8 to 50% by weight of the aqueous dispersion obtained by carrying out the polymerization.
• the lower limit of the concentration of the fluoropolymer is preferably 10% by mass, more preferably 15% by mass, the upper limit is preferably 40% by mass, and the more preferably upper limit is 35% by mass.
• the content of fluoropolymer in the aqueous dispersion was determined by drying 1 g of the aqueous dispersion in a blow dryer at 150°C for 60 minutes, measuring the mass of the heated residue, and calculating the mass of the aqueous dispersion (1 g). This value is obtained by calculating the percentage of the mass of the heated residue relative to the mass of the heated residue.
• a fluoropolymer can be obtained by the manufacturing method of the present disclosure.
• fluoropolymers include TFE polymers in which TFE is the monomer with the highest molar fraction (hereinafter referred to as the "most monomer"), VDF polymers in which VDF is the most monomer, and VDF polymers in which the largest monomer is VDF.
• CTFE polymers in which CTFE is CTFE.
• the fluoropolymer has an ion exchange rate (IXR) higher than 53.
• IXR ion exchange rate
• Preferred fluoropolymers have no ionic groups or a limited number of ionic groups resulting in ion exchange rates greater than about 100.
• the ion exchange rate of the preferred fluoropolymer is preferably 1,000 or more, more preferably 2,000 or more, and even more preferably 5,000 or more.
• the TFE polymer may preferably be a TFE homopolymer, or (1) TFE, (2) one or more fluorine-containing monomers other than TFE having 2 to 8 carbon atoms. , in particular VDF, HFP or CTFE, and (3) a copolymer of other monomers.
• Other monomers mentioned in (3) include, for example, fluoro(alkyl vinyl ether) having an alkyl group having 1 to 5 carbon atoms, especially 1 to 3 carbon atoms; fluorodioxole; perfluoroalkylethylene; ⁇ - Examples include hydroperfluoroolefins.
• the TFE polymer may also be a copolymer of TFE and one or more fluorine-free monomers.
• fluorine-free monomer examples include alkenes such as ethylene and propylene; vinyl esters; and vinyl ethers.
• the TFE polymer also includes a copolymer of TFE, one or more fluorine-containing monomers having 2 to 8 carbon atoms, and one or more non-fluorine-containing monomers. Good too.
• the VDF polymer may preferably be a VDF homopolymer [PVDF], or (1) VDF, (2) one or more VDFs having 2 to 8 carbon atoms. Copolymers of fluoroolefins, especially TFE, HFP or CTFE, and (3) perfluoro(alkyl vinyl ether) having an alkyl group having 1 to 5 carbon atoms, especially 1 to 3 carbon atoms, etc. Good too.
• the CTFE polymer may preferably be a CTFE homopolymer, or (1) CTFE, (2) one or more fluoroolefins other than CTFE having 2 to 8 carbon atoms, In particular, it may be a copolymer of TFE or HFP and (3) perfluoro(alkyl vinyl ether) having an alkyl group having 1 to 5 carbon atoms, especially 1 to 3 carbon atoms.
• the CTFE polymer may also be a copolymer of CTFE and one or more fluorine-free monomers, and the fluorine-free monomers include alkenes such as ethylene and propylene; vinyl Esters; examples include vinyl ethers.
• the fluoropolymer may be glassy, plastic or elastomeric. These may be amorphous or partially crystalline and may be subjected to compression firing processing, melt processing or non-melt processing.
• a tetrafluoroethylene polymer [TFE polymer (PTFE)] is used as the non-melt processable fluororesin
• PTFE tetrafluoroethylene polymer
• an ethylene/TFE copolymer is used as the melt-processable fluororesin.
• the electrolyte polymer precursor is (III) as a fluororubber, a TFE/propylene copolymer, a TFE/propylene/third monomer copolymer (the third monomer is VDF, HFP, CTFE, fluoroalkyl vinyl ethers, etc.), Copolymer consisting of TFE and fluoroalkyl vinyl ethers; HFP/ethylene copolymer, HFP/ethylene/TFE copolymer; VDF/HFP copolymer, HFP/ethylene copolymer, VDF/TFE/HFP copolymer and the fluorine-containing segmented polymer described in Japanese Patent Publication No. 61-49327 can be suitably produced.
• the above-mentioned fluoropolymer is preferably a fluororesin, more preferably a fluororesin with a fluorine substitution rate calculated by the following formula of 50% or more, even more preferably a fluororesin with a fluorine substitution rate of more than 50%, A fluororesin with a substitution rate of 55% or more is even more preferred, a fluororesin with a fluorine substitution rate of 60% or more is even more preferred, a fluororesin with a fluorine substitution rate of 75% or more is even more preferred, and a fluororesin with a fluorine substitution rate of 75% or more is even more preferred.
• Fluorine substitution rate (%) (Number of fluorine atoms bonded to carbon atoms constituting the fluoropolymer) / ((Number of hydrogen atoms bonded to carbon atoms constituting the fluoropolymer) + (carbon atoms constituting the fluoropolymer) Number of fluorine atoms and chlorine atoms bonded to)) ⁇ 100
• a fluororesin having the above-mentioned fluorine substitution rate of 95 to 100% is more preferable, PTFE, FEP or PFA is more preferable, and PTFE is particularly preferable.
• the obtained PTFE is compared to the PTFE obtained by polymerizing a fluoromonomer in the presence of a conventional polymer as described in Patent Documents 1 and 2. , 0.1% decomposition initiation temperature is high. Therefore, by using the manufacturing method of the present disclosure, PTFE having excellent heat resistance can be manufactured.
• the above fluoropolymer may have a core-shell structure.
• the fluoropolymer having a core-shell structure include modified PTFE, which includes a core of high molecular weight PTFE and a lower molecular weight PTFE or modified PTFE shell in the particles.
• modified PTFE include PTFE described in Japanese Patent Publication No. 2005-527652.
• the core-shell structure may have the following structure.
• Core TFE homopolymer Shell: TFE homopolymer Core: Modified PTFE Shell: TFE homopolymer Core: Modified PTFE Shell: Modified PTFE Core: TFE homopolymer Shell: Modified PTFE Core: Low molecular weight PTFE Shell: High molecular weight PTFE Core: High molecular weight PTFE Shell: Low molecular weight PTFE
• the lower limit of the core ratio is preferably 0.5% by mass, more preferably 1.0% by mass, even more preferably 3.0% by mass, particularly preferably 5.0% by mass. , most preferably 10.0% by weight.
• the upper limit of the core ratio is preferably 99.5% by mass, more preferably 99.0% by mass, even more preferably 98.0% by mass, even more preferably 97.0% by mass, particularly preferably 95.0% by mass. %, most preferably 90.0% by weight.
• the lower limit of the shell ratio is preferably 0.5% by mass, more preferably 1.0% by mass, even more preferably 3.0% by mass, particularly preferably 5.0% by mass. , most preferably 10.0% by weight.
• the upper limit of the proportion of the shell is preferably 99.5% by mass, more preferably 99.0% by mass, even more preferably 98.0% by mass, even more preferably 97.0% by mass, particularly preferably 95.0% by mass. %, most preferably 90.0% by weight.
• the core or the shell may have a structure of two or more layers.
• it may be a fluoropolymer having a three-layer structure including a central core of modified PTFE, an outer core of TFE homopolymer, and a shell of modified PTFE.
• Examples of the above-mentioned fluoropolymer having a core-shell structure include those in which one particle of the above-mentioned fluoropolymer has a plurality of cores.
• TFE is generally polymerized at a polymerization temperature of 10 to 150° C. and a polymerization pressure of 0.05 to 5 MPaG.
• the polymerization temperature is more preferably 30°C or higher, and even more preferably 50°C or higher.
• the temperature is more preferably 120°C or lower, and even more preferably 100°C or lower.
• the polymerization pressure is more preferably 0.3 MPaG or higher, still more preferably 0.5 MPaG or higher, more preferably 5.0 MPaG or lower, and even more preferably 3.0 MPaG or lower.
• it is preferably 1.0 MPaG or more, more preferably 1.2 MPaG or more, even more preferably 1.5 MPaG or more, and even more preferably 2.0 MPaG or more.
• the above polymerization is carried out by charging pure water into a pressure-resistant reaction vessel equipped with a stirrer, deoxidizing it, charging it with TFE, bringing it to a predetermined temperature, and adding a polymerization initiator to start the reaction. If the pressure decreases as the reaction progresses, additional TFE is continuously or intermittently supplied to maintain the initial pressure. When a predetermined amount of TFE has been supplied, the supply is stopped, the TFE in the reaction vessel is purged, and the temperature is returned to room temperature to terminate the reaction. Additional TFE may be supplied continuously or intermittently to prevent the pressure from decreasing.
• the TFE polymer is not only a TFE homopolymer, but also a copolymer of TFE and a modified monomer, which is non-melt processable (hereinafter referred to as "modified PTFE"). It is a concept that includes
• the modified monomer is not particularly limited as long as it can be copolymerized with TFE, and includes fluoromonomers and non-fluoromonomers. Furthermore, the number of modified monomers used may be one or more than one.
• Non-fluoromonomers include, for example, methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, propyl acrylate, propyl methacrylate butyl acrylate, butyl methacrylate, hexyl methacrylate, cyclohexyl methacrylate, vinyl methacrylate, vinyl acetate, acrylic acid, methacrylic acid, acrylonitrile. , methacrylonitrile, ethyl vinyl ether, cyclohexyl vinyl ether and the like.
• the non-fluoromonomers butyl methacrylate, vinyl acetate, and acrylic acid are preferred.
• fluoromonomer for example, perfluoroolefins such as hexafluoropropylene [HFP]; hydrogen-containing fluoroolefins such as trifluoroethylene and vinylidene fluoride [VDF]; perhaloolefins such as chlorotrifluoroethylene; perfluorovinyl ether; (perfluoroalkyl) ethylene; perfluoroallyl ether and the like.
• HFP hexafluoropropylene
• VDF vinylidene fluoride
• perhaloolefins such as chlorotrifluoroethylene
• perfluorovinyl ether perfluorovinyl ether
• perfluoroalkyl ethylene
• perfluoroallyl ether perfluoroallyl ether and the like.
• perfluoroorganic group means an organic group in which all hydrogen atoms bonded to carbon atoms are substituted with fluorine atoms.
• the perfluoro organic group may have an ether oxygen.
• perfluorovinyl ether examples include perfluoro(alkyl vinyl ether) [PAVE], in which Rf is a perfluoroalkyl group having 1 to 10 carbon atoms in the general formula (A).
• the perfluoroalkyl group preferably has 1 to 5 carbon atoms.
• Examples of the perfluoroalkyl group in PAVE include perfluoromethyl group, perfluoroethyl group, perfluoropropyl group, perfluorobutyl group, perfluoropentyl group, perfluorohexyl group, and the like.
• perfluorovinyl ethers further include general formula (A) in which Rf is a perfluoro(alkoxyalkyl) group having 4 to 9 carbon atoms, and Rf is the following formula:
• Rf is a group represented by the following formula:
• n an integer of 1 to 4.
• PFAE Perfluoroalkyl)ethylene
• examples thereof include (perfluorobutyl)ethylene (PFBE), (perfluorohexyl)ethylene, and the like.
• fluoromonomers represented by (wherein, Rf represents a perfluoroorganic group).
• Rf in the above general formula is the same as Rf in general formula (A).
• Rf is preferably a perfluoroalkyl group having 1 to 10 carbon atoms or a perfluoroalkoxyalkyl group having 1 to 10 carbon atoms.
• a modified monomer (3) having a monomer reactivity ratio of 0.1 to 8 is also preferably exemplified.
• PTFE particles with a small particle size can be obtained, and an aqueous dispersion with high dispersion stability can be obtained.
• the monomer reactivity ratio in copolymerization with TFE refers to the rate constant when the growing radical reacts with TFE when the growing radical is less than the repeating unit based on TFE, and the rate constant when the growing radical reacts with the modified monomer. This is the value divided by the rate constant when reacting with The lower this value is, the more reactive the modified monomer is with TFE.
• the monomer reactivity ratio can be calculated from the Feynman-Ross equation by copolymerizing TFE and a modified monomer and determining the composition of the resulting polymer immediately after initiation.
• the above copolymerization was carried out in a stainless steel autoclave with an internal volume of 6.0 L using 3,600 g of deionized degassed water, ammonium perfluorooctanoate of 1,000 mass ppm relative to the water, and 100 g of paraffin wax at a pressure of 0. It is carried out at 78 MPaG and a temperature of 70°C. 0.05 g, 0.1 g, 0.2 g, 0.5 g, and 1.0 g of modified monomers were added to the reactor, and 0.072 g of ammonium persulfate (20 mass ppm relative to water) was added, and the polymerization pressure was adjusted to 0. TFE is continuously supplied to maintain 78 MPaG.
• the modified monomer (3) having a monomer reactivity ratio of 0.1 to 8 is preferably at least one selected from the group consisting of modified monomers represented by formulas (3a) to (3d).
• CH 2 CH-Rf 1 (3a) (In the formula, Rf 1 is a perfluoroalkyl group having 1 to 10 carbon atoms.)
• CF 2 CF-O-Rf 2 (3b) (In the formula, Rf 2 is a perfluoroalkyl group having 1 to 2 carbon atoms.)
• X 3 and X 4 are F, Cl or a methoxy group, and Y is the formula Y1 or Y2.
• Z and Z' are F or a fluorinated alkyl group having 1 to 3 carbon atoms.
• the content of the modifying monomer (3) unit is preferably in the range of 0.00001 to 1.0% by mass based on the total polymerized units of PTFE.
• the lower limit is more preferably 0.0001% by mass, more preferably 0.0005% by mass, even more preferably 0.001% by mass, and even more preferably 0.005% by mass.
• the upper limits are, in order of preference, 0.90% by mass, 0.50% by mass, 0.40% by mass, 0.30% by mass, 0.20% by mass, 0.15% by mass, and 0.10% by mass. , 0.08% by mass, 0.05% by mass, and 0.01% by mass.
• the above-mentioned modifying monomers include hexafluoropropylene, chlorotrifluoroethylene, and vinylidene fluoride because they have a small average primary particle diameter, a small aspect ratio, and can produce an aqueous dispersion with excellent stability.
• the modified monomer preferably contains at least one selected from the group consisting of hexafluoropropylene, perfluoro(alkyl vinyl ether), and (perfluoroalkyl)ethylene. More preferably, it is selected from the group consisting of hexafluoropropylene, perfluoro(methyl vinyl ether), perfluoro(propyl vinyl ether), (perfluorobutyl)ethylene, (perfluorohexyl)ethylene, and (perfluorooctyl)ethylene.
• the total amount of the hexafluoropropylene unit, perfluoro(alkyl vinyl ether) unit, and (perfluoroalkyl)ethylene unit is preferably in the range of 0.00001 to 1% by mass based on the total polymerized units of PTFE.
• the lower limit of the total amount is more preferably 0.0001% by mass, more preferably 0.0005% by mass, even more preferably 0.001% by mass, and even more preferably 0.005% by mass.
• the upper limits are, in order of preference, 0.80% by mass, 0.70% by mass, 0.50% by mass, 0.40% by mass, 0.30% by mass, 0.20% by mass, and 0.15% by mass. , 0.10% by mass, 0.08% by mass, 0.05% by mass, and 0.01% by mass.
• the modified monomer preferably includes a modified monomer (hereinafter referred to as "modified monomer (A)”) having a functional group and a hydrophilic group that can react with radical polymerization.
• modified monomer (A) a modified monomer having a functional group and a hydrophilic group that can react with radical polymerization.
• PTFE particles with a small primary particle size can be obtained, and an aqueous dispersion with high dispersion stability can be obtained. Moreover, the amount of uncoagulated polymer can also be reduced. Furthermore, the aspect ratio of the primary particles can be reduced.
• the amount of the modified monomer (A) used is preferably an amount exceeding 0.1 mass ppm of the aqueous medium, more preferably an amount exceeding 0.5 mass ppm, and 1.0 mass ppm.
• the amount is more preferably more than 5 ppm by mass, even more preferably 5 ppm by mass or more, and particularly preferably 10 ppm by mass or more. If the amount of the modifying monomer (A) used is too small, the average primary particle size of the resulting PTFE may not become small.
• the amount of the modified monomer (A) to be used may be within the above range, but the upper limit can be, for example, 5000 ppm by mass.
• a modifying monomer (A) may be added to the system during the reaction in order to improve the stability of the aqueous dispersion during or after the reaction.
• modified monomer (A) Since the modified monomer (A) is highly water-soluble, even if unreacted modified monomer (A) remains in the aqueous dispersion, it can be easily removed in the concentration step or coagulation/washing step.
• the above-mentioned modified monomer (A) is incorporated into the resulting polymer during the polymerization process, but the concentration of the modified monomer (A) itself in the polymerization system is low, and the amount incorporated into the polymer is small, resulting in a decrease in the heat resistance of PTFE. There is no problem with coloring or coloring after firing.
• hydrophilic group in the modified monomer (A) examples include -NH 2 , -PO 3 M, -OPO 3 M, -SO 3 M, -OSO 3 M, -COOM (in each formula, M is H,
• the metal atom, NR 7y 4 , imidazolium which may have a substituent, pyridinium which may have a substituent, or phosphonium which may have a substituent, R 7y is H or an organic group. and may be the same or different. Any two may be bonded to each other to form a ring).
• -SO 3 M or -COOM is preferred.
• the organic group for R 7y is preferably an alkyl group.
• R 7y is preferably H or a C 1-10 organic group, more preferably H or C 1-4 organic group, and even more preferably H or C 1-4 alkyl group.
• the metal atoms include monovalent and divalent metal atoms, such as alkali metals (Group 1) and alkaline earth metals (Group 2), with Na, K, and Li being preferred.
• Examples of the "functional group capable of reacting in radical polymerization" in the modified monomer (A) include groups having an ethylenically unsaturated bond such as a vinyl group and an allyl group.
• the modified monomer (A) has a functional group that can react in radical polymerization, so when used in the polymerization, it reacts with the fluorine-containing monomer at the initial stage of the polymerization reaction, and has a hydrophilic group derived from the modified monomer (A). It is assumed that particles with high stability are formed. For this reason, it is thought that when polymerization is carried out in the presence of the above-mentioned modifying monomer (A), the number of particles increases.
• one type of the modified monomer (A) may be present, or two or more types thereof may be present.
• a compound having an unsaturated bond can be used as the modified monomer (A).
• hydrophilic groups examples include -NH 2 , -PO 3 M, -OPO 3 M, -SO 3 M, -OSO 3 M, -COOM (in each formula, M is H, a metal atom, NR 7y 4 , imidazolium which may have a substituent, pyridinium which may have a substituent or phosphonium which may have a substituent, R 7y is H or an organic group, and may be the same or different. Any two may be bonded to each other to form a ring.).
• -SO 3 M or -COOM is preferred.
• the organic group for R 7y is preferably an alkyl group.
• R 7y is preferably H or a C 1-10 organic group, more preferably H or C 1-4 organic group, and even more preferably H or C 1-4 alkyl group.
• the metal atoms include monovalent and divalent metal atoms, such as alkali metals (Group 1) and alkaline earth metals (Group 2), with Na, K, and Li being preferred.
• linking group refers to a divalent linking group.
• the linking group may be a single bond and preferably contains at least one carbon atom, and the number of carbon atoms may be 2 or more, 4 or more, or 8 or more. , may be 10 or more, or may be 20 or more. The upper limit is not limited, but may be, for example, 100 or less, or 50 or less.
• the linking group may be a chain or branched, cyclic or acyclic structure, saturated or unsaturated, substituted or unsubstituted, and optionally contains one or more members selected from the group consisting of sulfur, oxygen, and nitrogen.
• the linking group does not contain a carbon atom and may be a catenary heteroatom such as oxygen, sulfur or nitrogen.
• R a is preferably a catenary heteroatom such as oxygen, sulfur, or nitrogen, or a divalent organic group.
• R a is a divalent organic group
• the hydrogen atom bonded to the carbon atom may be replaced with a halogen other than fluorine, such as chlorine, and may or may not contain a double bond.
• R a may be either chain or branched, and may be cyclic or acyclic.
• R a may include a functional group (eg, ester, ether, ketone, amine, halide, etc.).
• R a may also be a non-fluorine divalent organic group or a partially fluorinated or perfluorinated divalent organic group.
• R a is preferably -(CH 2 ) a -, -(CF 2 ) a -, -O-(CF 2 ) a -, -(CF 2 ) a -O-(CF 2 ) b -, -O (CF 2 ) a -O-(CF 2 ) b -, -(CF 2 ) a -[O-(CF 2 ) b ] c -, -O(CF 2 ) a -[O-(CF 2 ) b ] c -, -[(CF 2 ) a -O] b -[(CF 2 ) c -O] d -, -O[(CF 2 ) a -O] b -[(CF 2 ) c -O] d -, -O[(CF 2 ) a -O] b -[(CF 2 ) c -O] d -
• a, b, c and d are independently at least 1 or more.
• a, b, c and d may independently be 2 or more, 3 or more, 4 or more, 10 or more, 20 or more.
• the upper limit of a, b, c, and d is, for example, 100.
• -R a -(CZ 1 Z 2 ) k - in general formula (4) is -CF 2 -O-CF 2 -, -CF 2 -O-CF(CF 3 )-, -CF 2 -O- C(CF 3 ) 2 -, -CF 2 -O-CF 2 -CF 2 -, -CF 2 -O-CF 2 -CF(CF 3 )-, -CF 2 -O-CF 2 -C(CF 3 ) 2 -, -CF 2 -O-CF 2 CF 2 -CF 2 -, -CF 2 -O-CF 2 CF 2 -CF (CF 3 )-, -CF 2 -O-CF 2 CF 2 -C ( CF 3 ) 2 -, -CF 2 -O-CF(CF 3 )-CF 2 -, -CF 2 -O-CF(CF 3 )-CF(CF 3 )-, -CF 2 -O-CF(CF
• the compound represented by the general formula (4) has a C—F bond and no C—H bond, except for the hydrophilic group (Y 3 ). That is, in the general formula (4), all of X i , X j , and X k are F, and R a is preferably a perfluoroalkylene group having 1 or more carbon atoms, and the perfluoroalkylene group is , may be either chain or branched, cyclic or acyclic, and may contain at least one catenary heteroatom. The perfluoroalkylene group may have 2 to 20 carbon atoms, or 4 to 18 carbon atoms.
• the compound represented by general formula (4) may be partially fluorinated. That is, the compound represented by general formula (4), excluding the hydrophilic group (Y 3 ), has at least one hydrogen atom bonded to a carbon atom and has at least one fluorine atom bonded to a carbon atom. It is also preferable.
• the compound represented by the general formula (4) is also preferably a compound represented by the following formula (4a).
• CF 2 CF-O-Rf 0 -Y 3 (4a)
• Y3 is a hydrophilic group
• Rf0 is perfluorinated, and may have a linear or branched, cyclic or acyclic structure, saturated or unsaturated, substituted or unsubstituted, (a perfluorinated divalent linking group optionally containing one or more heteroatoms selected from the group consisting of sulfur, oxygen, and nitrogen).
• the compound represented by the general formula (4) is also preferably a compound represented by the following formula (4b).
• CH 2 CH-O-Rf 0 -Y 3 (4b)
• Y 3 is a hydrophilic group
• Rf 0 is a perfluorinated divalent linking group defined by formula (4a).
• Y 3 is -OSO 3 M.
• CF 2 CF(OCF 2 CF 2 CF 2 CF 2 SO 2 N(CH 3 )
• Y 3 is -SO 3 M.
• M is the same as above.
• Y 3 is -COOM.
• Y 3 is -OPO 3 M or -OP(O)(OM) 2 .
• Y 3 is -PO 3 M or -P(O)(OM) 2 .
• CX 2 CY(-CZ 2 -O-Rf-Y 3 ) (5)
• X is the same or different and is -H or -F
• Y is -H, -F, an alkyl group or a fluorine-containing alkyl group
• Z is the same or different and is -H
• - F is an alkyl group or a fluorine-containing alkyl group.
• Rf is a fluorine-containing alkylene group having 1 to 40 carbon atoms, or a fluorine-containing alkylene group having an ether bond having 2 to 100 carbon atoms.
• Y 3 is the above-mentioned group.
• CX 2 CY(-O-Rf-Y 3 ) (6) (wherein, X is the same or different and is -H or -F, Y is -H, -F, an alkyl group or a fluorine-containing alkyl group, and Rf is a fluorine-containing alkylene group having 1 to 40 carbon atoms) , or a fluorine-containing alkylene group having an ether bond having 2 to 100 carbon atoms.
• Y 3 is the same as above.
• CX 2 CY (-Rf-Y 3 ) (7) (wherein, X is the same or different and is -H or -F, Y is -H, -F, an alkyl group or a fluorine-containing alkyl group, and Rf is a fluorine-containing alkylene group having 1 to 40 carbon atoms) or a fluorine-containing alkylene group having an ether bond having 2 to 100 carbon atoms (Y 3 is the same as above). is preferred.
• the above-mentioned fluorine-containing alkylene group having an ether bond having 2 to 100 carbon atoms is an alkylene group that does not include a structure in which an oxygen atom is a terminal, but includes an ether bond between carbon atoms.
• X is -H or -F. Both of X's may be -F, or at least one of them may be -H. For example, one may be -F and the other -H, or both may be -H.
• Y is -H, -F, an alkyl group, or a fluorine-containing alkyl group.
• the above-mentioned alkyl group is an alkyl group that does not contain a fluorine atom, and the number of carbon atoms may be 1 or more.
• the number of carbon atoms in the alkyl group is preferably 6 or less, more preferably 4 or less, and even more preferably 3 or less.
• the above-mentioned fluorine-containing alkyl group is an alkyl group containing at least one fluorine atom, and the number of carbon atoms may be 1 or more.
• the number of carbon atoms in the fluorine-containing alkyl group is preferably 6 or less, more preferably 4 or less, and even more preferably 3 or less.
• the above Y is preferably -H, -F or -CF 3 , more preferably -F.
• Z is the same or different and is -H, -F, an alkyl group or a fluoroalkyl group.
• the above alkyl group is an alkyl group that does not contain a fluorine atom, and the number of carbon atoms may be 1 or more.
• the number of carbon atoms in the alkyl group is preferably 6 or less, more preferably 4 or less, and still more preferably 3 or less.
• the above-mentioned fluorine-containing alkyl group is an alkyl group containing at least one fluorine atom, and the number of carbon atoms may be 1 or more.
• the number of carbon atoms in the fluorine-containing alkyl group is preferably 6 or less, more preferably 4 or less, and even more preferably 3 or less.
• the above Z is preferably -H, -F or -CF 3 , more preferably -F.
• At least one of the above X, Y and Z preferably contains a fluorine atom.
• X may be -H and Y and Z may be -F.
• Rf is a fluorine-containing alkylene group having 1 to 40 carbon atoms, or a fluorine-containing alkylene group having 2 to 100 carbon atoms and having an ether bond.
• the number of carbon atoms in the fluorine-containing alkylene group is preferably 2 or more. Further, it is preferably 30 or less, more preferably 20 or less, and even more preferably 10 or less.
• the above-mentioned fluorine-containing alkylene groups include -CF 2 -, -CH 2 CF 2 -, -CF 2 CF 2 -, -CF 2 CH 2 -, -CF 2 CF 2 CH 2 -, -CF(CF 3 )- , -CF(CF 3 )CF 2 -, -CF(CF 3 )CH 2 -, and the like.
• the fluorine-containing alkylene group is preferably a perfluoroalkylene group.
• the number of carbon atoms in the fluorine-containing alkylene group having an ether bond is preferably 3 or more. Further, the carbon number of the fluorine-containing alkylene group having an ether bond is preferably 60 or less, more preferably 30 or less, and even more preferably 12 or less.
• Examples of the fluorine-containing alkylene group having an ether bond include the following formula: (In the formula, Z 1 is F or CF 3 ; Z 2 and Z 3 are each H or F; Z 4 is H, F or CF 3 ; p1+q1+r1 is an integer from 1 to 10; s1 is 0 or 1; t1 is 0 A divalent group represented by an integer of 5 to 5 is also preferable.
• the above-mentioned fluorine-containing alkylene group having an ether bond includes -CF(CF 3 )CF 2 -O-CF(CF 3 )-, -(CF(CF 3 )CF 2 -O) n -CF(CF 3 )-(in the formula, n is an integer from 1 to 10), -CF(CF 3 )CF 2 -O-CF(CF 3 )CH 2 -, -(CF(CF 3 )CF 2 -O) n - CF(CF 3 )CH 2 - (in the formula, n is an integer from 1 to 10), -CH 2 CF 2 CF 2 O-CH 2 CF 2 CH 2 -, -CF 2 CF 2 CF 2 O-CF 2 CF 2- , -CF 2 CF 2 CF 2 O-CF 2 CF 2 CH 2 -, -CF 2 CF 2 O-CF 2 -, -CF 2 CF 2 O-CF 2 CH 2 -, and the like.
• Y 3 is -COOM, -SO 3 M or -OSO 3 M
• M is H, a metal atom, NR 7y 4 , imidazolium which may have a substituent, a substituent Pyridinium which may have a substituent or phosphonium which may have a substituent
• R 7y is H or an organic group, and may be the same or different. Any two may be bonded to each other to form a ring. ) is preferable.
• the organic group for R 7y is preferably an alkyl group.
• R 7y is preferably H or a C 1-10 organic group, more preferably H or C 1-4 organic group, and even more preferably H or C 1-4 alkyl group.
• metal atoms examples include alkali metals (Group 1), alkaline earth metals (Group 2), and Na, K, and Li are preferred.
• M is preferably -H, a metal atom or NR 7 4 , more preferably -H, an alkali metal (group 1), an alkaline earth metal (group 2) or NR 7 4 , -H, -Na, -K , -Li or NH 4 are even more preferred, -H, -Na, -K or NH 4 are even more preferred, -H, -Na or NH 4 are particularly preferred, and -H or -NH 4 are most preferred.
• the above Y 3 is preferably -COOM or -SO 3 M, more preferably -COOM.
• the compound represented by general formula (5) is preferably a compound (5a) represented by general formula (5a).
• CH 2 CF(-CF 2 -O-Rf-Y 3 ) (5a) (In the formula, Rf and Y3 are the same as above.)
• Z 1 is F or CF 3 ;
• Z 2 and Z 3 are each H or F;
• Z 4 is H, F or CF 3 ;
• p1+q1+r1 is an integer from 0 to 10;
• s1 is 0 or 1;
• t1 is 0
• An integer of ⁇ 5 and Y 3 are the same as above.However, when Z 3 and Z 4 are both H, p1+q1+r1+s1 is not 0). More specifically,
• the compound represented by general formula (5) is preferably a compound (5b) represented by general formula (5b).
• CX 2 2 CFCF 2 -O-(CF(CF 3 )CF 2 O) n5 -CF(CF 3 )-Y 3 (5b) (In the formula, each X 2 is the same and represents F or H. n5 represents 0 or an integer from 1 to 10, and Y 3 is the same as defined above.)
• the above n5 is preferably 0 or an integer of 1 to 5, more preferably 0, 1 or 2, and 0 or 1 in terms of the stability of the resulting aqueous dispersion. It is more preferable that The above Y 3 is preferably -COOM in terms of obtaining appropriate water solubility and stability of the aqueous dispersion, and the above M is less likely to remain as an impurity and improves the heat resistance of the obtained molded product. In this respect, H or NH4 is preferred.
• examples of the compound represented by the general formula (5) include a compound represented by the general formula (5c).
• CF 2 CFCF 2 -O-Rf-Y 3 (5c) (In the formula, Rf and Y3 are the same as above)
• X is -H or -F. Both of X's may be -F, or at least one of them may be -H. For example, one may be -F and the other -H, or both may be -H.
• Y is -H, -F, an alkyl group or a fluorine-containing alkyl group.
• the above-mentioned alkyl group is an alkyl group that does not contain a fluorine atom, and the number of carbon atoms may be 1 or more.
• the number of carbon atoms in the alkyl group is preferably 6 or less, more preferably 4 or less, and even more preferably 3 or less.
• the above-mentioned fluorine-containing alkyl group is an alkyl group containing at least one fluorine atom, and the number of carbon atoms may be 1 or more.
• the number of carbon atoms in the fluorine-containing alkyl group is preferably 6 or less, more preferably 4 or less, and even more preferably 3 or less.
• the above Y is preferably -H, -F or -CF 3 , more preferably -F.
• At least one of the above X and Y preferably contains a fluorine atom.
• X may be -H and Y and Z may be -F.
• Rf is a fluorine-containing alkylene group having 1 to 40 carbon atoms or a fluorine-containing alkylene group having an ether bond and having 2 to 100 carbon atoms.
• the number of carbon atoms in the fluorine-containing alkylene group is preferably 2 or more. Further, the number of carbon atoms in the fluorine-containing alkylene group is preferably 30 or less, more preferably 20 or less, and even more preferably 10 or less.
• the above-mentioned fluorine-containing alkylene groups include -CF 2 -, -CH 2 CF 2 -, -CF 2 CF 2 -, -CF 2 CH 2 -, -CF 2 CF 2 CH 2 -, -CF(CF 3 )- , -CF(CF 3 )CF 2 -, -CF(CF 3 )CH 2 -, and the like.
• the fluorine-containing alkylene group is preferably a perfluoroalkylene group.
• Y 3 is -COOM, -SO 3 M or -OSO 3 M
• M is H, a metal atom, NR 7y 4 , imidazolium which may have a substituent, a substituted Pyridinium which may have a group or phosphonium which may have a substituent
• R 7y is H or an organic group, and may be the same or different. Any two are bonded to each other, may form a ring) is preferable.
• the organic group for R 7y is preferably an alkyl group.
• R 7y is preferably H or a C 1-10 organic group, more preferably H or C 1-4 organic group, and even more preferably H or C 1-4 alkyl group.
• metal atoms examples include alkali metals (Group 1), alkaline earth metals (Group 2), and Na, K, and Li are preferred.
• M is preferably -H, a metal atom or NR 7 4 , more preferably -H, an alkali metal (group 1), an alkaline earth metal (group 2) or NR 7 4 , -H, -Na, -K , -Li or NH 4 are even more preferred, -H, -Na, -K or NH 4 are even more preferred, -H, -Na or NH 4 are particularly preferred, and -H or -NH 4 are most preferred.
• the above Y 3 is preferably -COOM or -SO 3 M, more preferably -COOM.
• the compound represented by general formula (6) is preferably at least one selected from the group consisting of compounds represented by general formulas (6a), (6b), (6c), (6d) and (6e).
• CF 2 CF-O-(CF 2 ) n1 -Y 3 (6a) (In the formula, n1 represents an integer from 1 to 10, and Y3 is the same as defined above.)
• CF 2 CF-O-(CF 2 C(CF 3 )F) n2 -Y 3 (6b) (In the formula, n2 represents an integer from 1 to 5, and Y3 is the same as defined above.)
• CF 2 CF-O-(CFX 1 ) n3 -Y 3 (6c) (In the formula, X 1 represents F or CF 3 , n3 represents an integer from 1 to 10, and Y 3 is the same as defined above.)
• CF 2 CF-O-(CF 2 CFX 1 O) n4 -(CF 2 ) n6 -Y 3 (6d) (In
• the above n1 is preferably an integer of 5 or less, more preferably an integer of 2 or less.
• the above Y3 is preferably -COOM because it provides appropriate water solubility and stability of the aqueous dispersion, and M is less likely to remain as an impurity and improves the heat resistance of the resulting molded product. and is preferably H or NH4 .
• n2 is preferably an integer of 3 or less in terms of the stability of the aqueous dispersion obtained
• Y3 is an integer that provides appropriate water solubility and stability of the aqueous dispersion.
• -COOM is preferable in that it is less likely to remain as an impurity
• H or NH 4 is preferable in that M is less likely to remain as an impurity and improves the heat resistance of the obtained molded product.
• the above n3 is preferably an integer of 5 or less from the viewpoint of water solubility, and the above Y 3 is -COOM
• the above M is preferably H or NH 4 from the viewpoint of improving dispersion stability.
• the above X 1 is preferably -CF 3 from the viewpoint of stability of the aqueous dispersion, and the above n 4 is preferably an integer of 5 or less from the viewpoint of water solubility,
• the above Y 3 is preferably -COOM in terms of obtaining appropriate water solubility and stability of the aqueous dispersion, and the above M is preferably H or NH 4 .
• n5 is preferably an integer of 5 or less in terms of water solubility
• Y3 is -COOM in terms of obtaining appropriate water solubility and stability of the aqueous dispersion.
• the above M is preferably H or NH4 .
• Rf is preferably a fluorine-containing alkylene group having 1 to 40 carbon atoms. In general formula (7), it is preferable that at least one of X and Y contains a fluorine atom.
• Y 3 is preferably -SO 3 M or -COOM
• M is H, a metal atom, NR 7y 4 , imidazolium which may have a substituent, pyridinium which may have a substituent, or Phosphonium which may have a substituent is preferable.
• R 7y represents H or an organic group.
• the above n1 is preferably an integer of 5 or less, more preferably an integer of 2 or less.
• the above Y3 is preferably -COOM because it provides appropriate water solubility and stability of the aqueous dispersion, and M is less likely to remain as an impurity and improves the heat resistance of the resulting molded product. and is preferably H or NH4 .
• n2 is preferably an integer of 3 or less in terms of the stability of the aqueous dispersion obtained
• Y3 is an integer that provides appropriate water solubility and stability of the aqueous dispersion.
• -COOM is preferable in that it is less likely to remain as an impurity
• H or NH 4 is preferable in that M is less likely to remain as an impurity and improves the heat resistance of the obtained molded product.
• the modified monomer preferably includes a modified monomer (A), and is represented by general formula (5a), general formula (5c), general formula (6a), general formula (6b), general formula (6c), and general formula It is preferable to contain at least one selected from the group consisting of compounds represented by (6d), and more preferably to contain a compound represented by general formula (5a) or general formula (5c).
• the content of the modified monomer (A) units is in the range of 0.00001 to 1.0% by mass based on the total polymerized units of the TFE polymer (PTFE). It is preferable that there be.
• the lower limit is more preferably 0.0001% by mass, more preferably 0.0005% by mass, even more preferably 0.001% by mass, and even more preferably 0.005% by mass.
• the upper limits are, in order of preference, 0.90% by mass, 0.50% by mass, 0.40% by mass, 0.30% by mass, 0.20% by mass, 0.15% by mass, and 0.10% by mass. , 0.08% by mass, 0.05% by mass, and 0.01% by mass.
• the polymer (I) can be used within the range of use in the production method of the present disclosure described above.
• the concentration of polymer (I) is not particularly limited as long as it is within the above range. If the amount added is too large, acicular particles with a large aspect ratio will be produced, and the aqueous dispersion will become gel-like, impairing its stability.
• the lower limit of the amount of polymer (I) used is preferably 0.0001% by mass, more preferably 0.001% by mass, even more preferably 0.01% by mass, particularly preferably 0.02% by mass, based on the aqueous medium. Mass%.
• the upper limit of the amount of the polymer (I) used is preferably 10% by mass, more preferably 5% by mass, based on the aqueous medium.
• Polymer (I) may be added all at once into the reaction vessel before the start of polymerization, may be added all at once after the start of polymerization, or may be added in multiple portions during polymerization. Alternatively, it may be added continuously during the polymerization.
• a persulfate for example, ammonium persulfate
• an organic peroxide such as disuccinic acid peroxide, or diglutaric acid peroxide
• a reducing agent such as sodium sulfite
• a radical scavenger such as hydroquinone or catechol
• a peroxide decomposer such as ammonium sulfite may be added to adjust the radical concentration within the system.
• a redox initiator that combines an oxidizing agent and a reducing agent.
• the oxidizing agent include persulfates, organic peroxides, potassium permanganate, manganese triacetate, cerium ammonium nitrate, and the like.
• the reducing agent include sulfites, bisulfites, bromates, diimines, oxalic acid, and the like.
• persulfates include ammonium persulfate and potassium persulfate.
• sulfites include sodium sulfite and ammonium sulfite.
• a copper salt or an iron salt to the redox initiator combination.
• the copper salt include copper(II) sulfate
• the iron salt include iron(II) sulfate.
• the redox initiator examples include potassium permanganate/oxalic acid, ammonium persulfate/bisulfite/iron sulfate, manganese triacetate/oxalic acid, cerium ammonium nitrate/oxalic acid, bromate/bisulfite, etc. potassium permanganate/oxalic acid is preferred.
• potassium permanganate/oxalic acid either an oxidizing agent or a reducing agent may be charged into a polymerization tank in advance, and then the other may be added continuously or intermittently to initiate polymerization.
• potassium permanganate/oxalic acid it is preferable to charge the oxalic acid into a polymerization tank and continuously add potassium permanganate thereto.
• chain transfer agents can be used, including saturated hydrocarbons such as methane, ethane, propane, and butane, and halogenated hydrocarbons such as chloromethane, dichloromethane, and difluoroethane. , alcohols such as methanol, ethanol, and isopropanol, and hydrogen, but those in a gaseous state at normal temperature and normal pressure are preferred.
• the amount of the chain transfer agent used is usually 1 to 10,000 mass ppm, preferably 1 to 5,000 mass ppm, based on the total amount of TFE supplied.
• a saturated hydrocarbon having 12 or more carbon atoms which is substantially inert to the reaction and becomes liquid under the above reaction conditions, is added as a dispersion stabilizer for the reaction system to an aqueous medium of 100%. It can also be used in an amount of 2 to 10 parts by weight. Additionally, ammonium carbonate, ammonium phosphate, etc. may be added as a buffer for adjusting the pH during the reaction.
• a polymer dispersion having a solid content concentration of 1.0 to 50% by mass and an average primary particle size of 50 to 500 nm can be obtained.
• the lower limit of the solid content concentration is preferably 5% by mass, more preferably 8% by mass.
• the upper limit is not particularly limited, but may be 40% by mass or 35% by mass.
• the lower limit of the average primary particle diameter is preferably 100 nm, more preferably 150 nm.
• the upper limit is preferably 400 nm, more preferably 350 nm.
• the above average primary particle diameter can be measured by a dynamic light scattering method.
• the above average primary particle diameter was determined by creating an aqueous dispersion with a solid content concentration of approximately 1.0% by mass and using a dynamic light scattering method at 25°C and the refractive index of the solvent (water) being 1.3328.
• the viscosity of the solvent (water) is 0.8878 mPa ⁇ s, and can be measured a total of 70 times.
• ELSZ-1000S manufactured by Otsuka Electronics Co., Ltd.
• a fine powder can be produced by coagulating an aqueous dispersion of TFE polymer.
• the aqueous dispersion of the TFE polymer described above can be used for various purposes as a fine powder after being coagulated, washed, and dried.
• the aqueous dispersion obtained by polymerizing polymer latex or the like is usually diluted with water to a polymer concentration of 5 to 20% by mass.
• the reaction is carried out by stirring more vigorously than during the reaction in a container equipped with a stirrer.
• the above coagulation may be performed by stirring while adding a water-soluble organic compound such as methanol or acetone, an inorganic salt such as potassium nitrate or ammonium carbonate, or an inorganic acid such as hydrochloric acid, sulfuric acid, or nitric acid as a coagulant.
• a water-soluble organic compound such as methanol or acetone
• an inorganic salt such as potassium nitrate or ammonium carbonate
• an inorganic acid such as hydrochloric acid, sulfuric acid, or nitric acid
• the above coagulation may also be performed continuously using an in-line mixer or the like.
• the concentration of the unagglomerated TFE polymer in the waste water produced by the aggregation is preferably low from the viewpoint of productivity, more preferably less than 0.4% by mass, and particularly preferably less than 0.3% by mass.
• Pigmented or filler-containing TFE in which pigments and fillers are uniformly mixed by adding pigments for coloring and various fillers to improve mechanical properties before or during the coagulation.
• a polymer fine powder can be obtained.
• the wet powder obtained by coagulating the aqueous dispersion of the TFE polymer is usually dried using vacuum, high frequency, hot air, etc. while keeping the wet powder in a state where it does not flow much, preferably in a static state. Do it using means. Friction between powders, especially at high temperatures, generally has an unfavorable effect on fine powder type TFE polymers. This is because particles made of this type of TFE polymer have the property of easily becoming fibrillated even by a small shearing force and losing their original stable particle structure.
• the above drying is carried out at a drying temperature of 10 to 300°C, preferably 100 to 300°C.
• the obtained TFE polymer fine powder is preferably used for molding, and suitable applications include tubes for hydraulic systems and fuel systems of aircraft and automobiles, flexible hoses for chemical liquids, steam, etc., electric wire coatings, etc. Can be mentioned.
• the aqueous dispersion of TFE polymer can also be stabilized and further concentrated by adding a nonionic surfactant, and used for various purposes as a composition with organic or inorganic fillers added depending on the purpose. It is also preferable.
• a nonionic surfactant used for various purposes as a composition with organic or inorganic fillers added depending on the purpose. It is also preferable.
• the coating surface has non-adhesion and a low coefficient of friction, and has excellent gloss, smoothness, abrasion resistance, weather resistance, and heat resistance. It is suitable for painting rolls and cooking utensils, impregnating glass cloth, etc.
• An organosol of TFE polymer can also be prepared from the above aqueous dispersion.
• the organosol can contain the TFE polymer and an organic solvent, and examples of the organic solvent include an ether solvent, a ketone solvent, an alcohol solvent, an amide solvent, an ester solvent, an aliphatic hydrocarbon solvent, Examples include aromatic hydrocarbon solvents and halogenated hydrocarbon solvents, and N-methyl-2-pyrrolidone, dimethylacetamide, etc. can be preferably used.
• the above organosol can be prepared, for example, by the method described in International Publication No. 2012/002038.
• the aqueous dispersion of the TFE polymer or the fine powder of the TFE polymer is also preferably used as a processing aid.
• a processing aid by mixing the above aqueous dispersion or the above fine powder with a host polymer, etc., it can improve the melt strength during melt processing of the host polymer, and improve the mechanical strength, electrical properties, and difficulty of the resulting polymer. Flammability, drip prevention properties during combustion, and sliding properties can be improved.
• the aqueous dispersion of the TFE polymer or the fine powder of the TFE polymer is also preferably used as a binder for batteries and as a dustproofing agent.
• the aqueous dispersion of the TFE polymer or the TFE polymer fine powder is used as a processing aid after being composited with a resin other than the TFE polymer.
• the above-mentioned aqueous dispersion or the above-mentioned fine powder is, for example, a raw material for PTFE described in JP-A-11-49912, US Pat. No. 5,804,654, JP-A-11-29679, and JP-A-2003-2980. It is suitable as The processing aids using the above aqueous dispersion or the above fine powder are in no way inferior to the processing aids described in the above publications.
• the aqueous dispersion of the TFE polymer is mixed with an aqueous dispersion of a melt-processable fluororesin and coagulated to form a co-agglomerated powder.
• the co-agglomerated powder is suitable as a processing aid.
• melt-processable fluororesin examples include FEP, PFA, TFE/perfluoroallyl ether copolymer, ETFE, ethylene/TFE/HFP copolymer [EFEP], among others, PFA or FEP preferable.
• the aqueous dispersion contains the melt-processable fluororesin.
• the melt-processable fluororesin include FEP, PFA, TFE/perfluoroallyl ether copolymer, ETFE, and EFEP.
• the aqueous dispersion containing the melt-processable fluororesin can be used as a paint.
• the melt-processable fluororesin can sufficiently fuse the particles of the TFE polymer to each other, thereby improving film-forming properties and giving gloss to the resulting film.
• the fluorine-free resin to which the co-agglomerated powder is added may be in the form of powder, pellets, or emulsion.
• the above addition is preferably carried out while applying a shearing force by a known method such as extrusion kneading or roll kneading in order to thoroughly mix each resin.
• the aqueous dispersion of the TFE polymer described above is also preferably used as a dust control treatment.
• the above-mentioned dust suppression treatment agent is mixed with a dust-generating substance, and the mixture is subjected to a compression-shearing action at a temperature of 20 to 200°C to fibrillate the TFE polymer, thereby suppressing the dust of the dust-generating substance.
• the above aqueous dispersion of the TFE polymer can be suitably used, for example, in the dust suppression treatment composition described in WO 2007/004250, and the dust suppression treatment method described in WO 2007/000812. It can also be suitably used.
• the above-mentioned dust control agent is applicable to the building materials field, soil stabilizing material field, solidification material field, fertilizer field, incineration ash and hazardous substance landfill disposal field, explosion prevention field, cosmetics field, sand for pet excrement such as cat litter, etc. It is suitably used for dust suppression treatment.
• the aqueous dispersion of the TFE polymer as a raw material for obtaining TFE polymer fibers by the dispersion spinning method.
• the above dispersion spinning method involves mixing an aqueous dispersion of the TFE polymer and an aqueous dispersion of a matrix polymer, extruding the mixture to form an intermediate fiber structure, and forming the intermediate fiber structure.
• the matrix polymer is decomposed by firing and the TFE polymer particles are sintered to obtain TFE polymer fibers.
• the high molecular weight PTFE powder obtained by polymerization has stretchability and non-melt processability, and is also useful as a raw material for stretched bodies (porous bodies).
• this stretched body is a membrane (PTFE stretched membrane or PTFE porous membrane)
• it can be stretched by a known PTFE stretching method.
• high molecular weight PTFE is easily fibrillated and becomes a porous PTFE body (membrane) consisting of nodules and fibers.
• a uniaxially stretched film can be obtained by roll stretching a sheet-like or rod-like paste extrudate in the extrusion direction.
• a biaxially stretched film can also be obtained by stretching in the width direction using a tenter or the like. It is also preferable to perform a semi-baking process before stretching.
• This stretched PTFE body is a porous body with a high porosity, and can be suitably used as a filter material for various precision filtration filters such as air filters and chemical filters, a support material for polymer electrolyte membranes, and the like. It is also useful as a material for products used in the textile field, medical field, electrochemical field, sealing material field, air filtration field, ventilation/internal pressure adjustment field, liquid filtration field, general consumer goods field, etc. Specific applications are illustrated below.
• Electrochemical field dielectric material prepreg, EMI shielding material, heat transfer material, etc. More specifically, printed wiring boards, electromagnetic shielding materials, insulation heat transfer materials, insulation materials, etc. Sealing materials field Gaskets, packing, pump diaphragms, pump tubes, aircraft sealing materials, etc.
• Air filtration field ULPA filters for semiconductor manufacturing), HEPA filters (for hospitals and semiconductor manufacturing), cylindrical cartridge filters (industrial), bag filters (industrial), heat-resistant bag filters (for exhaust gas treatment), heat-resistant pleated filters ( (for exhaust gas treatment), SINBRAN filter (industrial use), catalyst filter (for exhaust gas treatment), filter with adsorbent (for HDD incorporation), vent filter with adsorbent (for HDD incorporation), vent filter (for HDD incorporation, etc.), cleaning Machine filters (for vacuum cleaners), general-purpose multi-layer felt materials, GT cartridge filters (for GT compatible products), cooling filters (for electronic device housings), etc.
• Ventilation/Internal Pressure Adjustment Field Freeze-drying materials such as containers for freeze-drying, automotive ventilation materials for electronic circuits and lamps, container applications such as container caps, and electronic equipment including small terminals such as tablets and mobile phones.
• container applications such as container caps
• electronic equipment including small terminals such as tablets and mobile phones.
• medical ventilation purposes etc.
• Liquid filtration field Semiconductor liquid filtration filters (for semiconductor manufacturing), hydrophilic PTFE filters (for semiconductor manufacturing), filters for chemicals (for chemical processing), filters for pure water production lines (for pure water production), backwash liquids Filtration filters (for industrial wastewater treatment), etc.
• General consumer goods field Clothing cable guides (movable wires for motorcycles), motorcycle clothing, cast liners (medical supporters), vacuum cleaner filters, bagpipes (musical instruments), cables (signal cables for guitars, etc.), strings (for stringed instruments), etc. .
• Textile field PTFE fiber (textile material), sewing thread (textile), woven thread (textile), rope, etc.
• Low molecular weight PTFE can also be manufactured by the manufacturing method of the present disclosure.
• Low molecular weight PTFE may be produced by polymerization, or may be produced by reducing the molecular weight of high molecular weight PTFE obtained by polymerization by a known method (thermal decomposition, radiation decomposition, etc.).
• Low-molecular-weight PTFE also called PTFE micropowder
• PTFE micropowder with a molecular weight of 600,000 or less has excellent chemical stability and extremely low surface energy, and is resistant to fibrillation, improving slipperiness and the texture of the coating surface. It is suitable as an additive for the production of plastics, inks, cosmetics, paints, greases, office automation equipment parts, toners, etc. (see, for example, JP-A-10-147617).
• low molecular weight PTFE can be produced by dispersing a polymerization initiator and polymer (I) in an aqueous medium in the presence of a chain transfer agent, and polymerizing TFE with TFE or a monomer that can be copolymerized with TFE.
• the chain transfer agent is preferably at least one selected from the group consisting of alkanes having 2 to 4 carbon atoms. Specifically, methane, ethane, propane, butane, and isobutane are more preferred, and ethane and propane are even more preferred.
• the amount of the chain transfer agent is preferably 10 mass ppm or more or more than 10 mass ppm relative to the aqueous medium.
• the low molecular weight PTFE obtained by the above polymerization when using the low molecular weight PTFE obtained by the above polymerization as a powder, it can be made into powder particles by coagulating the above aqueous dispersion.
• high molecular weight PTFE means PTFE that has non-melt processability and fibrillation property.
• low molecular weight PTFE means PTFE that has melt processability and does not have fibrillation properties.
• the above-mentioned non-melt processability means a property in which the melt flow rate cannot be measured at a temperature higher than the crystallization melting point in accordance with ASTM D 1238 and D 2116.
• the presence or absence of fibrillation can be determined by "paste extrusion” which is a typical method of molding "high molecular weight PTFE powder” which is a powder made from a TFE polymer.
• Paste extrusion is usually possible because high molecular weight PTFE has fibrillating properties. If the unfired molded product obtained by paste extrusion has no substantial strength or elongation, for example, if the elongation is 0% and it breaks when pulled, it can be considered that it does not have fibrillation properties.
• the high molecular weight PTFE preferably has a standard specific gravity (SSG) of 2.130 to 2.280.
• SSG standard specific gravity
• the above standard specific gravity is measured by a water displacement method according to ASTM D792 using a sample molded according to ASTM D4895-89.
• "high molecular weight” means that the standard specific gravity is within the above range.
• the low molecular weight PTFE has a melt viscosity of 1 ⁇ 10 2 to 7 ⁇ 10 5 Pa ⁇ s at 380°C.
• melt viscosity means that the melt viscosity is within the above range.
• Melt viscosity was measured in accordance with ASTM D 1238 using a flow tester (manufactured by Shimadzu Corporation) and a 2 ⁇ -8L die under a load of 0.7 MPa using a 2 g sample preheated at 380°C for 5 minutes. This value is measured while maintaining the above temperature.
• the high molecular weight PTFE has a much higher melt viscosity than the low molecular weight PTFE, and it is difficult to accurately measure the melt viscosity.
• melt viscosity is employed as an index of the molecular weight of the high molecular weight PTFE
• melt viscosity is employed as an index of the molecular weight of the low molecular weight PTFE. Note that there is no known measuring method that can directly specify the molecular weight of either the high molecular weight PTFE or the low molecular weight PTFE.
• the high molecular weight PTFE preferably has a peak temperature of 333 to 347°C, more preferably 335 to 345°C.
• the low molecular weight PTFE preferably has a peak temperature of 322 to 333°C, more preferably 324 to 332°C.
• the peak temperature is determined by the differential heat (differential heat) obtained by heating PTFE, which has no history of being heated to a temperature of 300°C or higher, at a rate of 10°C/min using a TG/DTA (differential thermogravimetric simultaneous measuring device). It can be specified as the temperature corresponding to the maximum value appearing on the DTA) curve.
• the peak temperature of PTFE may be 322-347°C.
• the upper limit of the peak temperature of PTFE is 347°C or lower, 346°C or lower, 345°C or lower, 344°C or lower, 343°C or lower, 342°C or lower, 341°C or lower, or 340°C or lower. It's fine.
• the lower limit of the peak temperature of PTFE may be 333°C or higher and 335°C or higher.
• the upper limit of the peak temperature of the PTFE may be 333°C or lower and 332°C or lower.
• the lower limit of the peak temperature of PTFE may be 322°C or higher and 324°C or higher.
• the average primary particle diameter of the primary particles of low molecular weight PTFE is preferably 10 to 350 nm, more preferably 50 nm or more, even more preferably 90 nm or more, more preferably 300 nm or less, and even more preferably 250 nm or less. It is.
• a relatively small average primary particle diameter of the primary particles can be obtained, for example, by adding a modifying monomer to the polymerization system at the initial stage of TFE polymerization.
• the average primary particle diameter of the primary particles of low molecular weight PTFE can be measured by a dynamic light scattering method.
• a low molecular weight PTFE aqueous dispersion with a polymer solid concentration of approximately 1.0% by mass was prepared, and using a dynamic light scattering method, the measurement temperature was set at 25°C and the refractive index of the solvent (water) was adjusted. 1.3328, the viscosity of the solvent (water) is 0.8878 mPa ⁇ s, and the number of integrations is 70.
• ELSZ-1000S manufactured by Otsuka Electronics Co., Ltd.
• the above-mentioned high molecular weight PTFE has a heat of fusion curve of 333 to 347°C when heated at a rate of 10°C/min using a differential scanning calorimeter [DSC] for PTFE that has no history of being heated to a temperature of 300°C or higher. It is preferable that at least one endothermic peak appears in the range of , and the heat of fusion at 290 to 350° C. calculated from the heat of fusion curve is 52 mJ/mg or more.
• the heat of fusion of PTFE is more preferably 55 mJ/mg or more, and still more preferably 58 mJ/mg or more.
• An unfired tape (raw tape) can also be obtained from the PTFE fine powder obtained above.
• the polymerization of FEP is preferably carried out at a polymerization temperature of 10 to 150° C. and a polymerization pressure of 0.3 to 6.0 MPaG.
• a copolymer of TFE, HFP, and other monomers may be obtained as FEP by polymerizing other monomers that can be copolymerized with these monomers.
• Other monomers include the above-mentioned fluorine-containing monomers (excluding TFE and HFP) and non-fluorine-containing monomers.
• One or more types of other monomers can be used.
• perfluoro(alkyl vinyl ether) is preferred.
• the content of other monomer units in FEP may be 0.1 to 2% by mass based on the total monomer units.
• polymer (I) can be used within the range of use in the production method of the present disclosure, but is usually added in an amount of 0.0001 to 10% by mass based on 100% by mass of the aqueous medium. .
• cyclohexane methanol, ethanol, propanol, ethane, propane, butane, pentane, hexane, carbon tetrachloride, chloroform, methylene chloride, methyl chloride, etc.
• buffering agent it is preferable to use ammonium carbonate, disodium hydrogen phosphate, or the like.
• the aqueous dispersion of FEP obtained by the production method of the present disclosure may be post-treated, such as concentration, if necessary, then dried and powdered, and then melt-extruded to form pellets.
• the aqueous medium in the aqueous dispersion of FEP may contain additives such as nonionic surfactants as necessary, but it must not contain a water-soluble organic solvent such as a water-soluble alcohol. It may also be one that does not contain a water-soluble organic solvent.
• melt extrusion can be carried out by appropriately setting extrusion conditions as long as the extrusion conditions allow pelletization.
• the unstable terminal group is chemically unstable, it not only reduces the heat resistance of the resin but also causes an increase in the amount of attenuation of the obtained electric wire.
• the polymer at the end of polymerization can be produced such that the total number of unstable end groups and -CF 2 H end groups is 50 or less per 1 ⁇ 10 6 carbon atoms. preferable. More preferably, the number is less than 20 per 1 ⁇ 10 6 carbon atoms, and even more preferably 5 or less.
• the unstable terminal group and the -CF 2 H terminal group may be absent and all the terminal groups may be -CF 3 terminal groups.
• Unstable end groups and --CF 2 H end groups can be stabilized by converting them into --CF 3 end groups by fluorination treatment.
• the fluorination treatment method is not particularly limited, but may include a method of exposing the polymer to a fluorine radical source that generates fluorine radicals under fluorination treatment conditions.
• the fluorine radical source include fluorine gas, CoF 3 , AgF 2 , UF 6 , OF 2 , N 2 F 2 , CF 3 OF, and fluorinated halogens such as IF 5 and ClF 3 .
• a method in which fluorine gas and FEP obtained by the production method of the present disclosure are brought into direct contact is preferred, and from the viewpoint of reaction control, the contact may be performed using diluted fluorine gas with a fluorine gas concentration of 10 to 50% by mass.
• the diluted fluorine gas can be obtained by diluting fluorine gas with an inert gas such as nitrogen gas or argon gas.
• the above fluorine gas treatment can be performed at a temperature of 100 to 250°C, for example. Note that the processing temperature is not limited to the above range and can be set as appropriate depending on the situation.
• the fluorine gas treatment is preferably performed by continuously or intermittently supplying diluted fluorine gas into the reactor. This fluorination treatment may be carried out either as a dry powder after polymerization or as a melt-extruded pellet.
• the FEP obtained by the manufacturing method of the present disclosure has good moldability and is less prone to molding defects, and also has good heat resistance, chemical resistance, solvent resistance, insulation, electrical properties, etc.
• the above method for producing FEP powder is a method of obtaining powder by drying and pulverizing FEP obtained by the above-described production method of the present disclosure.
• the above powder may be fluorinated.
• the above-mentioned method for producing a fluorinated powder is a method of obtaining a fluorinated powder by supplying fluorine gas to the powder obtained by the above-described powder production method to fluorinate the powder.
• the above method for producing FEP pellets is a method for obtaining pellets by pelletizing the FEP obtained by the above-described production method of the present disclosure.
• the above pellets may be fluorinated.
• the above-described method for producing fluorinated pellets is a method of obtaining fluorinated pellets by supplying fluorine gas to the pellets obtained by the above-described pellet production method to fluorinate the pellets.
• this FEP can be used to manufacture various molded products such as electric wires, foamed electric wires, cables, covering materials for wires, tubes, films, sheets, filaments, and the like.
• TFE/perfluoro(alkyl vinyl ether) copolymers such as PFA and MFA and TFE/perfluoroallyl ether copolymers are usually polymerized at a polymerization temperature of 10 to 100°C. It is preferable to carry out the process at a pressure of 0.3 to 6.0 MPaG.
• TFE, perfluoro (alkyl vinyl ether) and other monomers may also be obtained.
• Other monomers include the above-mentioned fluorine-containing monomers (excluding TFE and perfluoro(alkyl vinyl ether)) and non-fluorine-containing monomers.
• One or more types of other monomers can be used.
• the content of other monomer units in the TFE/perfluoro(alkyl vinyl ether) copolymer may be 0.1 to 2% by mass based on the total monomer units.
• TFE, perfluoroallyl ether, and others can be produced as TFE/perfluoroallyl ether copolymers.
• a copolymer of monomers may also be obtained.
• Other monomers include the above-mentioned fluorine-containing monomers (excluding TFE and perfluoroallyl ether) and non-fluorine-containing monomers.
• One or more types of other monomers can be used.
• the content of other monomer units in the TFE/perfluoroallyl ether copolymer may be 0.1 to 2% by mass based on the total monomer units.
• the polymer (I) can be used within the range of use in the production method of the present disclosure, but usually, It is preferably added in an amount of 0.0001 to 10% by weight based on 100% by weight of the aqueous medium.
• TFE/perfluoro(alkyl vinyl ether) copolymer and TFE/perfluoroallyl ether copolymer cyclohexane, methanol, ethanol, propanol, propane, butane, pentane, hexane, carbon tetrachloride, It is preferable to use chloroform, methylene chloride, methyl chloride, methane, ethane, etc., and it is preferable to use ammonium carbonate, disodium hydrogen phosphate, etc. as a pH buffering agent.
• aqueous dispersion of TFE/perfluoro(alkyl vinyl ether) copolymer and TFE/perfluoroallyl ether copolymer such as PFA and MFA obtained by the production method of the present disclosure is subjected to post-treatment such as concentration as necessary. It may also be pelletized by drying, powdering, and then melt extrusion.
• the aqueous medium in the above aqueous dispersion may contain additives such as nonionic surfactants as necessary, but it must not contain a water-soluble organic solvent such as a water-soluble alcohol. It may also be one that does not contain a water-soluble organic solvent.
• melt extrusion can be carried out by appropriately setting extrusion conditions as long as the extrusion conditions allow pelletization.
• the above-mentioned copolymer is preferably subjected to fluorine gas treatment in order to improve its heat resistance and further strengthen the effect of suppressing the permeation of chemical liquid into the molded article.
• the fluorine gas treatment is performed by bringing fluorine gas into contact with the copolymer. However, since the reaction with fluorine is highly exothermic, it is preferred to dilute the fluorine with an inert gas such as nitrogen.
• the amount of fluorine in the fluorine gas/inert gas mixture is from 1 to 100% by weight, preferably from 10 to 25% by weight.
• the treatment temperature is 150 to 250°C, preferably 200 to 250°C, and the fluorine gas treatment time is 3 to 16 hours, preferably 4 to 12 hours.
• the gas pressure for the fluorine gas treatment ranges from 1 to 10 atmospheres, but atmospheric pressure is preferably used. If the reactor is used at atmospheric pressure, the fluorine gas/inert gas mixture may be passed continuously into the reactor. As a result, the unstable ends of the copolymer are converted to -CF 3 ends and become thermally stable.
• molding methods such as compression molding, transfer molding, extrusion molding, injection molding, and blow molding can be applied, similar to conventional PFA.
• Desired molded products can be obtained using such molding methods.
• molded products include sheets, films, packing, round bars, square bars, pipes, tubes, round tanks, square tanks, tanks, and wafers. Includes carriers, wafer boxes, beakers, filter housings, flow meters, pumps, valves, cocks, connectors, nuts, wires, heat-resistant wires, etc.
• tubes, pipes, tanks, connectors, etc. used in various chemical reaction devices, semiconductor manufacturing equipment, and acid-based or alkaline-based chemical supply devices that require impermeability to chemical solutions. Can be used.
• a nonionic surfactant is appropriately added to the aqueous dispersion of TFE/perfluoro(alkyl vinyl ether) copolymer and TFE/perfluoroallyl ether copolymer such as PFA and MFA, and if necessary, polyester is added.
• a primer composition can be obtained by dissolving or dispersing ether sulfone, polyamideimide and/or polyimide, and metal powder in an organic solvent. This primer composition is applied to a metal surface, a melt-processable fluororesin composition is applied on the thus formed primer layer, and the melt-processable fluororesin composition layer is fired together with the primer layer. It can also be used in a resin coating method.
• the polymerization of ETFE is preferably carried out at a polymerization temperature of 10 to 100°C and a polymerization pressure of 0.3 to 2.0 MPaG.
• a copolymer of ethylene, TFE, and other monomers may be obtained as ETFE by polymerizing other monomers that can be copolymerized with these monomers.
• Other monomers include the above-mentioned fluorine-containing monomers (excluding TFE) and non-fluorine-containing monomers (excluding ethylene).
• One or more types of other monomers can be used.
• the content of other monomer units in ETFE may be 0 to 20% by mass based on the total monomer units.
• the polymer (I) can be used within the range of use in the production method of the present disclosure, but is usually added in an amount of 0.0001 to 10% by mass based on 100% by mass of the aqueous medium. .
• the aqueous dispersion of ETFE obtained by the production method of the present disclosure may be post-treated, such as concentration, if necessary, then dried and powdered, and then melt-extruded to form pellets.
• the aqueous medium in the above aqueous dispersion may contain additives such as nonionic surfactants as necessary, but it must not contain a water-soluble organic solvent such as a water-soluble alcohol. It may also be one that does not contain a water-soluble organic solvent.
• melt extrusion can be carried out by appropriately setting extrusion conditions as long as the extrusion conditions allow pelletization.
• ETFE sheet can be made into a sheet by extrusion molding. That is, ETFE powder or pellets can be melted, continuously extruded from a die, and cooled to form a sheet-like molded product. Additives may be added to ETFE.
• additives known additives can be used as appropriate. Specific examples include ultraviolet absorbers, light stabilizers, antioxidants, infrared absorbers, flame retardants, flame retardant fillers, organic pigments, inorganic pigments, dyes, and the like. Inorganic additives are preferred from the viewpoint of excellent weather resistance.
• the content of the additive in the ETFE sheet is preferably 20% by mass or less, particularly preferably 10% by mass or less, based on the total mass of the ETFE sheet.
• the above ETFE sheet has excellent mechanical strength and appearance, so it is used as a membrane material (roofing material, ceiling material, exterior wall material, interior wall material, covering material, etc.) for membrane structure buildings (athletic facilities, gardening facilities, atriums, etc.). ) is suitable.
• membrane material for membrane structure buildings
• board materials for outdoor use soundproof walls, windbreak fences, overtopping fences, garage canopies, shopping malls, walkway walls, roofing materials
• glass shatterproof films heat-resistant and water-resistant Sheets, building materials, etc.
• tent materials for tent warehouses membrane materials for sunshades, partial roof materials for lighting, window materials in place of glass, membrane materials for flameproof partitions, curtains, outer wall reinforcement, waterproof membranes, smokeproof membranes
• non-combustible transparent partitions road reinforcement, interiors (lighting, walls, brands, etc.), exteriors (tents, signboards, etc.), daily life leisure goods (fishing rods, rackets, golf clubs, projection screens, etc.), automotive materials (hoods, etc.) , vibration damping materials, bodies, etc.), aircraft materials, ship materials, home appliance exteriors, tanks, container inner walls, filters, construction membrane materials, electronic materials (printed circuit boards, wiring boards, insulating films, mold release films, etc.), solar cells It is useful as a surface material for modules, a mirror protector for solar thermal power generation, a surface material for solar water heaters, etc.
• An electrolyte polymer precursor can also be produced using the production method of the present disclosure.
• the electrolyte polymer precursor is preferably polymerized at a polymerization temperature of 10 to 100° C. and a polymerization pressure of 0.1 to 2.0 MPaG.
• the electrolyte polymer precursor contains a functional group represented by -SO2X151 , -COZ151 or -POZ152Z153 ( X151 , Z151 , Z152 and Z153 are as described below). It consists of monomers that can be converted into ion-exchangeable polymers through hydrolysis treatment.
• Y 151 represents a fluorine atom, a chlorine atom, a -SO 2 F group, or a perfluoroalkyl group.
• the perfluoroalkyl group may include ether oxygen and a -SO 2 F group.
• n is , represents an integer from 0 to 3.
• n Y 151 's may be the same or different.
• Y 152 represents a fluorine atom, a chlorine atom, or a -SO 2 F group.
• m is Represents an integer from 1 to 5.
• m Y 152 may be the same or different.
• a 151 represents -SO 2 X 151 , -COZ 151 or -POZ 152 Z 153 .
• X 151 represents F, Cl, Br, I, -OR 151 or -NR 152 R 153.
• Z 151 , Z 152 and Z 153 are the same or different and represent -NR 154 R 155 or -OR 156 .
• R 151 , R 152 , R 153 , R 154 , R 155 and R 156 are the same or different and represent an alkyl group, an aryl group, or a sulfonyl-containing group which may contain H, ammonium, an alkali metal, or a fluorine atom. ) can be mentioned.
• monomers used in the electrolyte polymer precursor include compounds containing two fluorosulfonyl groups described in WO 2007/013532, -SO 2 F groups and dioxolane described in WO 2014/175123.
• Perfluoromonomers having a ring can also be mentioned.
• the electrolyte polymer precursor may be modified with a third monomer in a range of 0 to 20% by mass of the total monomers.
• a third monomer in a range of 0 to 20% by mass of the total monomers.
• CTFE vinylidene fluoride, perfluoroalkyl vinyl ether, perfluorobutenyl vinyl ether; perfluoro-2,2-dimethyl-1,3-dioxolane, perfluoro-2-methylene-4-methyl-1 , 3-dioxole and other cyclic monomers; and divinylbenzene and other polyfunctional monomers.
• the electrolyte polymer precursor obtained in this way is formed into a membrane, for example, and then hydrolyzed with an alkaline solution and treated with a mineral acid to be used as a polymer electrolyte membrane for fuel cells, electrolyzers, redox flow batteries, etc. It can be used for.
• an electrolyte polymer dispersion can be obtained by performing hydrolysis with an alkaline solution while maintaining the dispersed state of the electrolyte polymer precursor. Subsequently, by heating to 120° C. or higher in a pressurized container, it can be dissolved in, for example, a water/alcohol mixed solvent to form a solution.
• the solution obtained in this way can be used, for example, as a binder for electrodes, or can be composited with various additives to form a cast film and used, for example, as an antifouling coating or an organic actuator.
• the polymerization temperature of the TFE/VDF copolymer is not particularly limited and may be 0 to 100°C.
• the polymerization pressure is appropriately determined depending on other polymerization conditions such as the polymerization temperature, but may generally be 0 to 9.8 MPaG.
• the TFE/VDF copolymer may also be modified using a third monomer within a range of 0 to 50 mol% of the total monomers.
• TFE:ethylene:third monomer (30-85):(10-69.9):(0.1-10).
• the third monomer may be a fluorine-free ethylenic monomer.
• the fluorine-free ethylenic monomer is preferably selected from ethylenic monomers having 6 or less carbon atoms in order to maintain heat resistance and chemical resistance.
• Examples include sulfonic acid, acrylic acid, and methacrylic acid.
• the polymer (I) can be used within the range used in the production method of the present disclosure, but it is usually used in an amount of 0.0001 to 5% by mass based on 100% by mass of the aqueous medium. Add in quantity.
• the TFE/VDF copolymer may be amidated by contacting with aqueous ammonia, ammonia gas, or a nitrogen compound capable of producing ammonia.
• the TFE/VDF copolymer obtained by the above-mentioned method is also preferably used as a raw material for obtaining TFE/VDF copolymer fiber by a spinning/drawing method.
• the above-mentioned spinning/drawing method involves melt-spinning a TFE/VDF copolymer, cooling and solidifying it to obtain an undrawn yarn, and then running the undrawn yarn through a heated cylindrical body and drawing it. /VDF copolymer fiber.
• a solution of the TFE/VDF copolymer can also be obtained by dissolving the TFE/VDF copolymer in an organic solvent.
• organic solvent include nitrogen-containing organic solvents such as N-methyl-2-pyrrolidone, N,N-dimethylacetamide, and dimethylformamide; ketone solvents such as acetone, methyl ethyl ketone, cyclohexanone, and methyl isobutyl ketone; and ethyl acetate.
• ester solvents such as butyl acetate; ether solvents such as tetrahydrofuran and dioxane; and general-purpose organic solvents with a low boiling point such as mixed solvents thereof.
• the above solution can be used as a binder for batteries.
• aqueous dispersion of the TFE/VDF copolymer on a porous substrate made of polyolefin resin and use it as a composite porous membrane. It is also preferable to disperse inorganic particles and/or organic particles in an aqueous dispersion and coat it on a porous substrate to use it as a composite porous membrane.
• the composite porous membrane thus obtained can be used as a separator for lithium secondary batteries.
• the powder of the melt-processable fluororesin described above can be suitably used as a powder coating.
• a powder coating made of the melt-processable fluororesin powder described above is applied to a substrate, a film with a smooth surface can be obtained.
• Melt-processable fluororesin powder with an average particle size of 1 ⁇ m or more and less than 100 ⁇ m is particularly suitable as a powder coating used in electrostatic coating, and melt-processable fluororesin powder with an average particle size of 100 ⁇ m or more and 1000 ⁇ m or less It is particularly suitable as a powder coating for use in rotational coating or rotational molding.
• the melt-processable fluororesin powder described above can be produced by a method of obtaining powder by drying and powdering the melt-processable fluororesin obtained by the production method of the present disclosure described above.
• a manufacturing method for manufacturing the melt-processable fluororesin powder is also part of the present disclosure.
• the polymerization of the fluororubber is carried out by charging pure water and the polymer (I) into a pressure-resistant reaction vessel equipped with a stirrer, deoxidizing it, charging the monomer, and maintaining the polymer at a predetermined temperature. and add a polymerization initiator to start the reaction. Since the pressure decreases as the reaction progresses, additional monomer is continuously or intermittently supplied to maintain the initial pressure. When a predetermined amount of monomer has been supplied, the supply is stopped, the monomer in the reaction vessel is purged, and the temperature is returned to room temperature to complete the reaction. In this case, the polymer latex can be continuously removed from the reaction vessel.
• fluoropolymer fine particles are first synthesized at the above-mentioned concentration, then diluted and further polymerized. It is also possible to use methods that can increase the final polymerization rate compared to polymerization.
• the polymerization temperature is usually -20 to 200°C, preferably 5 to 150°C
• the polymerization pressure is usually 0. It is carried out at a pressure of 5 to 10 MPaG, preferably 1 to 7 MPaG.
• the pH in the polymerization medium is preferably maintained generally at 2.5 to 13 by a known method using a pH adjuster, etc., which will be described later.
• monomers used in the polymerization of the fluororubber include fluorine-containing ethylenically unsaturated monomers that have at least the same number of fluorine atoms as carbon atoms and can be copolymerized with vinylidene fluoride.
• fluorine-containing ethylenically unsaturated monomer include trifluoropropene, tetrafluoropropene, pentafluoropropene, hexafluoropropene, 2,3,3,3-tetrafluoropropene, hexafluorobutene, and octafluorobutene. It will be done.
• hexafluoropropene or 2,3,3,3-tetrafluoropropene is particularly preferred because of the properties of the elastomer obtained if it blocks the crystal growth of the polymer.
• fluorine-containing ethylenically unsaturated monomer include trifluoroethylene, TFE, and CTFE, and fluorine-containing monomers having one or more chlorine and/or bromine substituents may also be used.
• TFE and HFP are preferred for producing fluororubber.
• polymer (I) can be used within the range of use in the production method of the present disclosure, but is usually added in an amount of 0.0001 to 20% by mass based on 100% by mass of the aqueous medium. do. Preferably it is 10% by mass or less, more preferably 2% by mass or less.
• a known inorganic radical polymerization initiator can be used as the polymerization initiator.
• the inorganic radical polymerization initiator conventionally known water-soluble inorganic peroxides such as sodium, potassium and ammonium persulfates, perphosphates, perborates, percarbonates or permanganates are particularly suitable. Useful.
• the radical polymerization initiator may further include a reducing agent, such as a sodium, potassium or ammonium sulfite, bisulfite, metabisulfite, hyposulfite, thiosulfate, phosphite or hypophosphite.
• a suitable inorganic radical polymerization initiator is ammonium persulfate, more preferably used in a redox system with ammonium persulfate and sodium bisulfite.
• the concentration of the polymerization initiator added is appropriately determined depending on the molecular weight of the target fluoropolymer and the polymerization reaction rate, but is 0.0001 to 10% by mass, preferably 0.01 to 10% by mass, based on 100% by mass of the total amount of monomers.
• the amount is set at 5% by mass.
• chain transfer agents can be used, including hydrocarbons, esters, ethers, alcohols, ketones, chlorine compounds, carbonates, and iodine compounds.
• isopentane, diethyl malonate, and ethyl acetate are preferred from the viewpoint that the reaction rate is less likely to decrease, and diiodine compounds such as I(CF 2 ) 4 I, I(CF 2 ) 6 I, ICH 2 I, It is preferable from the viewpoint that it is possible to iodinate the polymer terminal and can be used as a reactive polymer.
• the amount of the chain transfer agent used is usually 0.5 ⁇ 10 ⁇ 3 to 5 ⁇ 10 ⁇ 3 mol%, preferably 1.0 ⁇ 10 ⁇ 3 to 3.5 ⁇ 10 based on the total amount of monomers supplied. -3 mol% is preferred.
• phosphates, sodium hydroxide, potassium hydroxide, etc. can be preferably used as pH adjusters.
• the aqueous dispersion of fluororubber obtained by the production method of the present disclosure has a solid content concentration of 1.0 to 40% by mass and an average particle diameter of 0.03 to 1 ⁇ m, preferably 0.05 ⁇ 0.5 ⁇ m and a number average molecular weight of 1,000 to 2,000,000.
• the aqueous dispersion of fluororubber obtained by the production method of the present disclosure may be subjected to treatments such as coagulation and heating.
• the above coagulation can be performed by adding alkaline earth and earth metal salts to the aqueous dispersion.
• alkaline earth and earth metal salts include sulfates, nitrates, hydrochlorides, and acetates of calcium, magnesium, aluminum, and the like.
• the coagulated fluorine-containing elastomer may be washed with water to remove small amounts of impurities such as buffers and salts present in the fluorine-containing elastomer, and then the washed fluorine-containing elastomer may be dried.
• the drying temperature is preferably 40 to 200°C, more preferably 60 to 180°C, and even more preferably 80 to 150°C.
• perfluororubber is obtained by polymerizing perfluoromonomers in an aqueous medium in the presence of polymer (I).
• CF 2 CF-ORf 13 (In the formula, Rf 13 represents a perfluoroalkyl group having 1 to 8 carbon atoms.)
• CF 2 CFOCF 2 ORf 14 (In the formula, Rf 14 is a linear or branched perfluoroalkyl group having 1 to 6 carbon atoms, a cyclic perfluoroalkyl group having 5 to 6 carbon atoms, or 2 carbon atoms containing 1 to 3 oxygen atoms.
• CF 2 CFO(CF 2 CF(Y 15 )O) m (CF 2 ) n F
• Y 15 represents a fluorine atom or a trifluoromethyl group.
• m is an integer of 1 to 4.
• n is an integer of 1 to 4.
• At least one type is preferred.
• a monomer that provides a crosslinking site may be polymerized together with the perfluoromonomer.
• the polymer (I) used in the method for producing a perfluoroelastomer preferably has an ion exchange capacity of 1.50 meq/g or more.
• the ion exchange capacity of the polymer (I) is, in order of preference, 1.75 meq/g or more, 2.00 meq/g or more, 2.40 meq/g or more, 2.50 meq/g or more, and 2.60 meq/g. Above, 3.00 meq/g or more, 3.50 meq/g or more.
• the ion exchange capacity is the content of ionic groups (anionic groups) in the polymer (I), and is calculated from the composition of the polymer (I).
• Precursor groups that become ionic upon hydrolysis are not considered ionic groups for purposes of determining ion exchange capacity.
• the amount of polymer (I) added is preferably 0.01 to 20% by mass based on 100% by mass of the aqueous medium.
• the amount of polymer (I) to be added is more preferably 0.1% by mass or more, and even more preferably The content is 0.5% by mass or more, particularly preferably 0.75% by mass or more, and most preferably 1.0% by mass or more.
• the amount of polymer (I) added is more preferably 15% by mass or less, further preferably 10% by mass or less, particularly preferably 5% by mass or less, based on 100% by mass of the aqueous medium.
• the perfluoromonomer may be polymerized in the presence of a polymerization initiator.
• the polymerization initiator is as described above.
• the amount of the polymerization initiator added is preferably 0.0001 to 10% by weight, more preferably 0.01 to 5% by weight, based on 100% by weight of the perfluoromonomer.
• the polymerization of the perfluoromonomer may be carried out in the presence of a pH adjuster.
• a pH adjuster By performing the polymerization in the presence of a pH adjuster, it is possible to generate a sufficient number of perfluoroelastomer particles at a sufficient polymerization rate while further suppressing adhesion of the perfluoroelastomer to the polymerization tank.
• the pH adjuster may be added before or after the start of polymerization.
• ammonia water, sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, ammonium carbonate, sodium hydrogen carbonate, potassium hydrogen carbonate, ammonium hydrogen carbonate, sodium phosphate, potassium phosphate, sodium hydrogen phosphate , sodium dihydrogen phosphate, potassium hydrogen phosphate, potassium dihydrogen phosphate, sodium citrate, potassium citrate, ammonium citrate, sodium gluconate, potassium gluconate, ammonium gluconate, and the like can be used.
• partially fluorinated rubber is obtained by polymerizing a fluoromonomer in an aqueous medium in the presence of polymer (I).
• Fluoromonomers for obtaining partially fluorinated rubber include vinylidene fluoride (VdF), tetrafluoroethylene (TFE), hexafluoropropylene (HFP), perfluoro(alkyl vinyl ether) (PAVE), and chlorofluoride.
• VdF vinylidene fluoride
• TFE tetrafluoroethylene
• HFP hexafluoropropylene
• PAVE perfluoro(alkyl vinyl ether)
• chlorofluoride chlorofluoride
• Trifluoroethylene trifluoroethylene
• trifluoropropylene trifluoropropylene
• tetrafluoropropylene pentafluoropropylene
• trifluorobutene tetrafluoroisobutene
• hexafluoroisobutene vinyl fluoride, iodine-containing fluorinated vinyl ether
• CHX 1 CX 2 Rf (wherein, one of X 1 and X 2 is H, the other is F, and Rf is a linear or branched fluoroalkyl group having 1 to 12 carbon atoms). At least one selected from the group consisting of monomer (2) is preferred.
• the method for producing partially fluorinated rubber it is preferable to polymerize at least vinylidene fluoride or tetrafluoroethylene as the fluoromonomer, and it is more preferable to polymerize vinylidene fluoride.
• the amount of polymer (I) added is preferably 0.01 to 20% by mass based on 100% by mass of the aqueous medium.
• the amount of polymer (I) added is preferably 0.0001% by mass or more, and even more preferably 0.0001% by mass or more, based on 100% by mass of the aqueous medium, since the polymerization reaction of the fluoromonomer proceeds more smoothly. It is at least 0.0005% by weight, even more preferably at least 0.001% by weight, particularly preferably at least 0.005% by weight, and most preferably at least 0.01% by weight.
• the amount of polymer (I) added if the amount added is too large, the effect commensurate with the amount added will not be obtained, which is economically disadvantageous. It is preferably 2% by mass or less, more preferably 1% by mass or less, particularly preferably 0.5% by mass or less.
• the fluoromonomer may be polymerized in the presence of a polymerization initiator.
• the polymerization initiator is as described above.
• the amount of the polymerization initiator is appropriately determined depending on the type of monomer, the intended molecular weight of the partially fluorinated rubber, and the reaction rate.
• the amount of the polymerization initiator is appropriately determined depending on the molecular weight of the target partially fluorinated rubber and the polymerization reaction rate, but is preferably 0.00001 to 10% by mass based on 100% by mass of the total monomer amount. , more preferably 0.0001 to 1% by mass.
• the above-mentioned fluororubber may be partially fluorinated rubber or perfluororubber.
• the partially fluorinated rubber preferably contains a methylene group (-CH 2 -) in its main chain.
• the partially fluorinated rubber containing -CH 2 - in its main chain is not particularly limited as long as it contains a chemical structure represented by -CH 2 -, for example, -CH 2 -CF 2 -, -CH 2 Examples include partially fluorinated rubbers containing structures such as -CH (CH 3 )-, -CH 2 -CH 2 -, -CH 2 -CF (CF 3 )-, and these include, for example, vinylidene fluoride, propylene, By polymerizing ethylene, 2,3,3,3-tetrafluoropropylene, etc., it can be introduced into the main chain of partially fluorinated rubber.
• the content of tetrafluoroethylene units in the partially fluorinated rubber (the content of polymerized units based on tetrafluoroethylene based on the total polymerized units of the partially fluorinated rubber) may be less than 40 mol%.
• the partially fluorinated rubber preferably contains VdF units or TFE units.
• Partially fluorinated rubbers include vinylidene fluoride (VdF)-based fluororubbers, tetrafluoroethylene (TFE)/propylene (Pr)-based fluororubbers, and tetrafluoroethylene (TFE)/propylene/vinylidene fluoride (VdF)-based fluororubbers.
• VdF vinylidene fluoride
• TFE tetrafluoroethylene
• Pr propylene
• VdF tetrafluoroethylene
• VdF tetrafluoroethylene
• HFP ethylene/hexafluoropropylene
• HFP ethylene/hexafluoropropylene
• HFP ethylene/hexafluoropropylene
• VdF vinylidene fluoride
• TFE tetrafluoroethylene
• Et/TFE/PAVE type fluororubber Et/TFE/PAVE type fluororubber, and the like.
• at least one selected from the group consisting of vinylidene fluoride-based fluororubber and tetrafluoroethylene/propylene-based fluororubber is preferred.
• the vinylidene fluoride-based fluororubber is preferably a copolymer consisting of 45 to 85 mol% of vinylidene fluoride and 55 to 15 mol% of at least one other monomer copolymerizable with vinylidene fluoride. . More preferably, it is a copolymer consisting of 50 to 80 mol% of vinylidene fluoride and 50 to 20 mol% of at least one other monomer copolymerizable with vinylidene fluoride.
• non-fluorinated monomers These can be used alone or in any combination. Among these, it is preferable to use at least one selected from the group consisting of TFE, HFP, 2.3.3.3-tetrafluoropropene, fluoroalkyl vinyl ether, and CTFE.
• fluoroalkyl vinyl ether a fluoromonomer represented by general formula (160) is preferable.
• vinylidene fluoride-based fluorororubbers include VdF/HFP-based rubber, VdF/HFP/TFE-based rubber, VdF/CTFE-based rubber, VdF/CTFE/TFE-based rubber, and VdF/general formula (100).
• Fluoromonomer-based rubber represented by VdF/general formula (100)/TFE-based rubber, VdF/perfluoro(methyl vinyl ether) [PMVE]-based rubber, VdF/PMVE/TFE-based rubber, VdF/PMVE/ Examples include TFE/HFP rubber.
• VdF/HFP copolymer or VdF/HFP/TFE copolymer is more preferable, and the composition of VdF/HFP/TFE is (32-85)/(10-34)/(0 ⁇ 40) (mol %) is particularly preferred.
• the composition of VdF/HFP/TFE is more preferably (32-85)/(15-34)/(0-34) (mol%), and (47-81)/(17-32)/(0-34) (mol%). 28) (mol %) is more preferable.
• the composition of VdF/HFP is preferably (45-85)/(15-55) (mol%), more preferably (50-83)/(17 -50) (mol%), more preferably (55-81)/(19-45) (mol%), particularly preferably (60-80)/(20-40) (mol%) be.
• the VdF/TFE/PMVE rubber is preferably a copolymer having a VdF/TFE/PMVE composition of (32 to 85)/(3 to 40)/(10 to 34) mol%; More preferably, it is a copolymer consisting of 81)/(4-30)/(16-28) mol%.
• the composition of Et/TFE/PAVE is preferably (10-40)/(32-60)/(20-40) (mol%), and (20-40 )/(40-50)/(20-30) (mol%) is more preferable.
• PMVE is preferred as PAVE.
• tetrafluoroethylene/propylene fluororubber is preferably a copolymer consisting of 45 to 70 mol% of tetrafluoroethylene, 55 to 30 mol% of propylene, and 0 to 5 mol% of a fluoromonomer providing a crosslinking site. .
• the above fluororubber may be perfluororubber.
• the above-mentioned perfluororubbers include perfluororubbers containing TFE, such as TFE/fluoromonomer copolymers represented by general formulas (160), (130), or (140), and TFE/fluoromonomer copolymers represented by general formulas (160), (130), ) or (140) is preferred.
• the composition is preferably 45-90/10-55 (mol%), more preferably 55-80/20-45, even more preferably 55-90/10-55 (mol%). 70/30-45.
• the ratio is preferably 45 to 89.9/10 to 54.9/0.01 to 4 (mol%), more preferably 55 to 77.
• the ratio is 9/20 to 49.9/0.1 to 3.5, more preferably 55 to 69.8/30 to 44.8/0.2 to 3.
• the ratio is preferably 50 to 90/10 to 50 (mol%). , more preferably 60-88/12-40, still more preferably 65-85/15-35.
• TFE/fluoromonomer represented by general formula (160), (130) or (140) having 4 to 12 carbon atoms/monomer copolymer providing a crosslinking site preferably 50 to 89.9/10 ⁇ 49.9/0.01 ⁇ 4 (mol%), more preferably 60 ⁇ 87.9/12 ⁇ 39.9/0.1 ⁇ 3.5, still more preferably 65 ⁇ 84 .8/15-34.8/0.2-3.
• composition falls outside of these ranges, the properties as a rubber elastic body tend to be lost and the properties become close to those of a resin.
• the above-mentioned perfluororubbers include TFE/fluoromonomer represented by general formula (140)/fluoromonomer copolymer providing a crosslinking site, TFE/perfluorovinyl ether copolymer represented by general formula (140), TFE / fluoromonomer copolymer represented by general formula (160), and TFE / fluoromonomer represented by general formula (160) / at least one selected from the group consisting of a monomer copolymer that provides a crosslinking site It is preferable that
• perfluoro rubber examples include perfluoro rubbers described in International Publication No. 97/24381, Japanese Patent Publication No. 61-57324, Japanese Patent Publication No. 4-81608, Japanese Patent Publication No. 5-13961, etc. I can do it.
• the above-mentioned fluororubber has a glass transition temperature of preferably -70°C or higher, more preferably -60°C or higher, and even more preferably -50°C or higher in view of its excellent compression set at high temperatures. .
• the temperature is preferably 5°C or lower, more preferably 0°C or lower, and even more preferably -3°C or lower.
• the above glass transition temperature was determined by obtaining a DSC curve by heating 10 mg of a sample at a rate of 10°C/min using a differential scanning calorimeter (manufactured by Mettler Toledo, DSC822e), and calculating the differential of the DSC curve at the second-order transition. The point on the curve that takes the maximum value can be determined as the glass transition temperature.
• the Mooney viscosity ML (1+20) at 170° C. of the fluororubber is preferably 30 or more, more preferably 40 or more, and even more preferably 50 or more. In addition, from the viewpoint of good workability, it is preferably 150 or less, more preferably 120 or less, and even more preferably 110 or less.
• the Mooney viscosity ML (1+20) at 140° C. of the fluororubber is preferably 30 or more, more preferably 40 or more, and even more preferably 50 or more in terms of good heat resistance. In addition, from the viewpoint of good workability, it is preferably 180 or less, more preferably 150 or less, and even more preferably 110 or less.
• the Mooney viscosity ML (1+10) at 100° C. of the fluororubber is preferably 10 or more, more preferably 20 or more, and even more preferably 30 or more in terms of good heat resistance. In addition, from the viewpoint of good workability, it is preferably 120 or less, more preferably 100 or less, and even more preferably 80 or less.
• the above Mooney viscosity can be measured according to JIS K6300 at 170°C, 140°C, or 100°C using a Mooney viscometer MV2000E manufactured by ALPHA TECHNOLOGIES.
• the fluorororubber obtained by the production method of the present disclosure may be in any form as long as it is obtained from the above polymerization, and may be an aqueous dispersion after polymerization, or an aqueous dispersion after polymerization. It can also be used as gum or crumb obtained by coagulating, drying, etc. using conventionally known methods.
• the polymer (I) used in the production method of the present disclosure can improve the stability of the aqueous dispersion, and as mentioned above, it is possible to add an initiator such as an organic peroxide, an iodine or a bromine compound, etc. during the polymerization. It is more preferably used in polymerization methods in which poorly water-soluble substances such as chain transfer agents are added.
• the above-mentioned gum is a small granular lump made of fluororubber, and the above-mentioned crumb is the result of fluororubber being unable to maintain its small granular shape as gum at room temperature and fusing together. It is in the form of an amorphous lump.
• the above fluororubber can be processed into a fluororubber composition by adding a curing agent, a filler, etc.
• curing agent examples include polyols, polyamines, organic peroxides, organic tin, bis(aminophenol)tetraamine, bis(thioaminophenol), and the like.
• the above fluororubber composition is made of the above-mentioned fluororubber, it is excellent in that it does not substantially contain an emulsifier and is easily crosslinked during molding.
• a fluororubber molded article can be obtained by molding using the above fluororubber.
• the above-mentioned molding method is not particularly limited, and includes known methods using the above-mentioned curing agent. Examples of the molding method include, but are not limited to, compression molding, injection molding, injection molding, extrusion molding, and funnel curing.
• a crosslinked product can be obtained as a fluororubber molded article by crosslinking the fluororubber composition.
• a crosslinking method a steam crosslinking method, a heating crosslinking method, a radiation crosslinking method, etc. can be employed, and among them, a steam crosslinking method and a heating crosslinking method are preferable.
• Specific crosslinking conditions which are not limited, are usually within a temperature range of 140 to 250°C and a crosslinking time of 1 minute to 24 hours, and may be appropriately determined depending on the types of crosslinking accelerator, crosslinking agent, acid acceptor, etc.
• the above fluororubber molded product is suitable for seals, gaskets, wire coverings, hoses, tubes, laminates, accessories, etc., and is particularly suitable for semiconductor manufacturing equipment parts, automobile parts, etc.
• the fluoropolymer when the fluoropolymer is coagulated, washed, dried, etc., waste water and off-gas are generated. From the wastewater generated by the coagulation or washing and/or the off-gas generated by drying, the polymer (I), the decomposition products of the polymer (I) that are by-produced from the polymer (I), By collecting and purifying by-products, residual monomers, etc., the above-mentioned polymer (I), decomposition products, by-products, residual monomers, etc. of the above-mentioned polymer (I) that are by-produced from the above-mentioned polymer (I) are obtained. may be reused.
• the method for performing the above recovery and purification is not particularly limited, but any known method can be used.
• any known method can be used.
• Examples include the method described in Japanese Patent Application Publication No. 2011-520020, US Patent Application Publication No. 2007/15937, US Patent Application Publication No. 2007/25902, and US Patent Application Publication No. 2007/27251 Examples include the method described in , and specific examples include the following method.
• a method for recovering the polymer (I), decomposition products and by-products of the polymer (I), residual monomers, etc., from the waste water ion exchange resin, activated carbon, etc. can be recovered from the waste water.
• methods include a method in which adsorbent particles such as silica gel, clay, and zeolite are brought into contact with each other to adsorb the polymer (I), and then the waste water and the adsorbent particles are separated. By incinerating the adsorbed particles that have adsorbed the polymer (I), etc., it is possible to prevent the polymer (I), etc., from being released into the environment.
• the polymer (I) and the like can also be recovered by desorption and elution from the ion exchange resin particles that have adsorbed the polymer (I) and the like by a known method.
• the ion exchange resin particles are anion exchange resin particles
• the polymer (I) etc. can be eluted by bringing a mineral acid into contact with the anion exchange resin.
• a water-soluble organic solvent is subsequently added to the resulting eluate, it usually separates into two phases, so the lower phase containing the polymer (I), etc. is collected and neutralized to recover the polymer (I), etc. can.
• the water-soluble organic solvent include polar solvents such as alcohol, ketone, and ether.
• Other methods for recovering the polymer (I) and the like from ion exchange resin particles include a method using an ammonium salt and a water-soluble organic solvent, and a method using an alcohol and, if desired, an acid. In the latter method, ester derivatives such as polymer (I) are produced, which can be easily separated from alcohol by distillation.
• the wastewater contains fluoropolymer particles or other solids
• methods for removing fluoropolymer particles and other solids include a method in which they are precipitated by adding an aluminum salt or the like, and then the wastewater and the precipitate are separated, an electrocoagulation method, and the like. Alternatively, it may be removed by mechanical methods, such as cross-flow filtration, depth filtration, and precoat filtration.
• the concentration of the unagglomerated fluoropolymer in the wastewater is preferably low from the viewpoint of productivity, more preferably less than 0.4% by mass, and particularly preferably less than 0.3% by mass.
• a method for recovering the polymer (I) etc. from the above-mentioned off-gas is to use a scrubber to bring the polymer (I) etc. into contact with an organic solvent such as deionized water, aqueous alkaline solution, glycol ether solvent, etc.
• organic solvent such as deionized water, aqueous alkaline solution, glycol ether solvent, etc.
• Examples include methods for obtaining a scrubber solution.
• the scrubber solution can be recovered in a state where the polymer (I) and the like are phase-separated, making it easy to recover and reuse the polymer (I) and the like.
• the alkali compound include alkali metal hydroxides, quaternary ammonium salts, and the like.
• the scrubber solution containing the above polymer (I) etc. may be concentrated using a reverse osmosis membrane or the like.
• the concentrated scrubber solution usually contains fluorine ions, but by further adding alumina after concentration to remove the fluorine ions, it is possible to facilitate the reuse of the polymer (I) and the like.
• the polymer (I) or the like may be recovered by the method described above by bringing adsorption particles into contact with the scrubber solution to adsorb the polymer (I) or the like.
• the polymer (I) etc. recovered by any of the above methods can be reused in the production of fluoropolymer.
• composition also provides a composition containing a polymer (I) and a fluoropolymer, wherein the polymer (I) is a polymer unit (I) based on a monomer (I) represented by the general formula (I).
• the polymer (I) is a polymer unit (I) based on a monomer (I) represented by the general formula (I).
• CX 1 X 3 CX 2 R(-CZ 1 Z 2 -A 0 ) m (I)
• X 1 and X 3 are each independently F, Cl, H or CF 3
• X 2 is H, F, an alkyl group or a fluorine-containing alkyl group
• a 0 is an anion
• R is a linking group
• Z 1 and Z 2 are each independently H, F, an alkyl group, or a fluorine-containing alkyl group
• m is an integer of 1 or more.
• CHF CHF (II)
• composition of the present disclosure can be suitably produced by the production method of the present disclosure.
• the form of the composition of the present disclosure is not particularly limited, and may be, for example, an aqueous dispersion, a coagulum, a dried product, a gum, a crumb, a powder, a pellet, or the like.
• An aqueous dispersion is a dispersion system in which an aqueous medium is used as a dispersion medium and a fluoropolymer is used as a dispersoid.
• the aqueous medium is not particularly limited as long as it is a liquid containing water, and may contain an organic solvent such as alcohol, ether, ketone, paraffin wax, etc. in addition to water.
• the composition of the present disclosure may be an aqueous fluoropolymer dispersion in which primary particles of a fluoropolymer are dispersed in an aqueous medium.
• the above-mentioned aqueous dispersion is an aqueous dispersion obtained by performing the above-mentioned polymerization, a dispersion obtained by concentrating this aqueous dispersion or dispersion stabilization treatment, and a powder consisting of a fluoropolymer at the interface above. It may be any one dispersed in an aqueous medium in the presence of an activator.
• the compositions of the present disclosure may also be fluoropolymer powders. Fluoropolymer powder can be obtained, for example, by coagulating a fluoropolymer in an aqueous fluoropolymer dispersion by a known method.
• the content of the polymer (I) in the composition is preferably 0.001% by mass or more, more preferably 0.005% by mass or more, even more preferably 0.01% by mass or more, based on the fluoropolymer. Particularly preferably .05% by weight or more, and most preferably 0.10% by weight or more. Further, the content of the polymer (I) in the composition is preferably 10% by mass or less, more preferably 5.0% by mass or less, even more preferably 2.0% by mass or less, based on the fluoropolymer. It is particularly preferably 0.0% by weight or less, and most preferably 0.50% by weight or less.
• the content of polymer (I) is determined by solid state NMR measurement. Also, International Publication No. 2014/099453, International Publication No. 2010/075497, International Publication No. 2010/075496, International Publication No. 2011/008381, International Publication No. 2009/055521, International Publication No. 1987/007619, JP Publication No. 1986-293476, International Publication No. 2010/075494, International Publication No. 2010/075359, International Publication No. 2006/119224, International Publication No. 2013/085864, International Publication No. 2012/082707, International Publication No. International Publication No. 2012/082703, International Publication No. 2012/082454, International Publication No.
• the content of the dimer and trimer of monomer (I) in polymer (I) is preferably 1.0% by mass or less with respect to polymer (I).
• the content of the dimer and trimer of monomer (I) in the composition of the present disclosure is 1.0% by mass or less, preferably 0.1% by mass or less, based on the polymer (I).
• the content is more preferably 0.01% by mass or less, further preferably 0.001% by mass or less, particularly preferably 0.0001% by mass or less.
• the content of dimer and trimer composed of monomer (I) and monomer (II) in polymer (I) is 1.0 with respect to polymer (I). It is preferably less than % by mass.
• the content of dimer and trimer composed of monomer (I) and monomer (II) in the composition of the present disclosure is 1.0% by mass or less with respect to polymer (I). , preferably 0.1% by mass or less, more preferably 0.01% by mass or less, further preferably 0.001% by mass or less, particularly preferably 0.0001% by mass or less.
• the content of dimer and trimer in the composition of the present disclosure can be measured by the same method as the content of dimer and trimer in polymer (I).
• the polymer (I) in the composition of the present disclosure has the same content as the polymer (I) used in the production method of the present disclosure, including a fraction with a molecular weight of 3000 or less, a fraction with a molecular weight of 2000 or less, and a fraction with a molecular weight of 1500 or less.
• the following fractions or fractions with a molecular weight of 1000 or less may or may not be included.
• the polymer (I) in the composition of the present disclosure may have the same structure as the polymer (I) used in the production method of the present disclosure.
• the fluoropolymer in the composition of the present disclosure may have a similar configuration to the fluoropolymer obtained by the production method of the present disclosure. Therefore, examples of the fluoropolymer include tetrafluoroethylene polymer [TFE polymer (PTFE)], melt-processable fluororesin, fluororubber, and the like.
• TFE polymer PTFE
• melt-processable fluororesin fluororubber
• composition of the present disclosure contains PTFE and polymer (I) as the fluoropolymer, 0.1% It is also characterized by a high decomposition initiation temperature. Therefore, the composition containing PTFE of the present disclosure has excellent heat resistance.
• composition of the present disclosure contains a fluorine-containing surfactant.
• a composition containing a fluorine-containing surfactant has the advantage that it can be stably produced with high productivity using the fluorine-containing surfactant.
• composition of the present disclosure does not substantially contain a fluorine-containing surfactant.
• a composition that does not substantially contain a fluorine-containing surfactant needs to be produced by polymerizing a fluoromonomer without using a fluorine-containing surfactant, but it can be produced by the production method of the present disclosure using polymer (I). , manufacturing became possible.
• not substantially containing a fluorine-containing surfactant means that the content of the fluorine-containing surfactant in the composition is 10 mass ppm or less, preferably 1 mass ppm. or less, more preferably 100 mass ppb or less, still more preferably 10 mass ppb or less, even more preferably 1 mass ppb or less, particularly preferably liquid chromatography-mass spectrometry (LC/MS). )
• the fluorine-containing surfactant is below the detection limit.
• the content of the fluorine-containing surfactant can be determined by a known method. For example, it can be quantified by LC/MS analysis. First, methanol is added to the composition, extraction is performed, and the resulting extract is analyzed by LC/MS. In order to further increase the extraction efficiency, treatments such as Soxhlet extraction and ultrasonication may be performed. Molecular weight information is extracted from the obtained LC/MS spectrum, and consistency with the structural formula of the candidate fluorine-containing surfactant is confirmed. After that, we prepared aqueous solutions with contents of five or more levels of the confirmed fluorine-containing surfactants, and conducted LC/MS analysis of the aqueous solutions with each content to determine the content and the relationship between the area and the content. Plot and draw a calibration curve. Then, using the calibration curve, the area of the LC/MS chromatogram of the fluorine-containing surfactant in the extract can be converted into the content of the fluorine-containing surfactant.
• composition of the present disclosure can be suitably used for the above-mentioned uses.
• Mw weight average molecular weight
• Mn number average molecular weight
• content of fractions with a molecular weight of 3000 or less The Mw and Mn of the polymer L were determined by gel permeation chromatography (GPC) equipped with a differential refractive index detector (RI-501 manufactured by Showa Denko) using one Tosoh column (TSKgel ⁇ -M and one TSG gel ⁇ -3000) was used in conjunction, and 0.05 M lithium bromide-added dimethylformamide was used as a solvent at a flow rate of 0.8 ml/min for measurement, and the molecular weight was calculated using monodisperse polystyrene as a standard. I asked for it.
• the recovered liquid was analyzed using a liquid chromatography mass spectrometer (Waters, LC-MS ACQUITY UPLC/TQD) to obtain a chromatogram of the recovered liquid.
• the content of dimer and trimer contained in the recovered liquid is determined by calculating the integral value of the peak derived from dimer and trimer appearing in the chromatogram of the recovered liquid using the calibration curve of analog monomer. It was calculated by converting it into trimer content.
• the limit of quantification in this measurement equipment configuration is 1 ng/mL.
• Mooney viscosity of fluororubber Mooney viscosity was measured at 100° C. according to JIS K 6300-1.2013 using a Mooney viscometer MV2000E manufactured by ALPHA TECHNOLOGIES.
• polymer adhesion rate The ratio of the mass of polymer deposits attached to the polymerization tank after completion of polymerization to the total amount of polymer (fluororubber) after completion of polymerization (adhesion rate to the polymerization tank) was determined by the following formula.
• Polymer deposits include the following: This includes polymers that adhere to the interior of the polymerization tank, such as the inner walls of the polymerization tank or stirring blades, and polymers that have been released from the aqueous dispersion due to coagulation and are floating or precipitated without being dispersed in the aqueous dispersion. .
• the mass of the polymer deposit is the mass after water contained in the polymer deposit is removed by drying at 120°C.
• the average particle diameter is the cumulant average diameter calculated by the method described above, the number of polymer particles (fluororubber particle number) is the number per 1 cc of water, and the specific gravity of all the fluororubbers in the example is 1 It was set at .8.
• APS ammonium persulfate
• the obtained aqueous solution containing Polymer L was put into a dialysis membrane (molecular weight cut off: 3500 Da, made of cellulose), and dialyzed by contacting with water at room temperature to obtain an aqueous solution of Polymer L.
• the concentration of polymer L in the aqueous solution obtained by performing dialysis membrane purification was 1.4% by mass.
• the molar ratio with the polymerized units based on was 1.0/1.1.
• the weight average molecular weight (Mw) of the obtained polymer L was 9.7 ⁇ 10 4
• the number average molecular weight (Mn) was 5.0 ⁇ 10 4
• the content of the fraction having a molecular weight of 3000 or less in the aqueous solution obtained by performing dialysis was 0.1% by mass or less.
• the decomposition initiation temperature was 355°C.
• aqueous solutions with different contents of polymer L were prepared.
• the particle size of each aqueous solution was measured by dynamic light scattering (DLS)
• the particle size could not be measured if the content of polymer L was 8.2% by mass or less based on the aqueous solution. Therefore, the polymer L has high water solubility.
• An aqueous solution of Polymer L (polymer L content: 1.4% by mass) obtained by performing dialysis was added, the polymerization tank was sealed, and the inside of the system was replaced with nitrogen to remove oxygen.
• VDF vinylidene fluoride
• TFE tetrafluoroethylene
• HFP hexafluoropropylene
• a polymerization initiator aqueous solution in which 0.026 g of ammonium persulfate (APS) was dissolved in deionized water was pressurized with nitrogen gas to initiate polymerization.
• APS ammonium persulfate
• a polymerization initiator aqueous solution containing 0.026 g of APS was injected under pressure with nitrogen gas.
• the aqueous dispersion was prepared in the same manner as in Example 1, except that 3.0 hours after the start of polymerization, an aqueous polymerization initiator solution containing 0.026 g of APS was pressurized with nitrogen gas. I got it.
• An aqueous dispersion was obtained in the same manner as in Example 1, except that an aqueous polymerization initiator solution containing 0.026 g of APS was then pressurized with nitrogen gas.
• Example 2 (Production of PTFE) In a glass reactor with an internal capacity of 1 L and equipped with a stirrer, 452.53 g of deionized water, 30 g of paraffin wax, and 78.57 g of an aqueous solution of Polymer L (an aqueous solution of Polymer L obtained by performing dialysis) were placed. (Polymer L content: 1.4% by mass)) and ammonia water was added to adjust the pH to 9.2. Next, the contents of the reactor were heated to 70° C. while being suctioned and simultaneously purged with TFE monomer to remove oxygen in the reactor. The contents were then stirred at 540 rpm.
• TFE monomer After adding 1.26 g of HFP into the reactor, TFE monomer was added until a pressure of 0.73 MPaG was reached. 2.75 mg of ammonium persulfate (APS) initiator dissolved in 20 g of deionized water was injected into the reactor and the reactor was brought to a pressure of 0.83 MPaG. After injection of the initiator, a pressure drop occurred and the onset of polymerization was observed. TFE monomer was added to the reactor and the pressure was kept constant at 0.78 MPaG. When the amount of TFE monomer consumed in the reaction reached about 30 g, the supply of TFE monomer and stirring were stopped. Subsequently, the gas in the reactor was slowly released until the pressure of the reactor reached 0.02 MPaG.
• APS ammonium persulfate
• TFE monomer was supplied until the pressure of the reactor reached 0.78 MPaG, and stirring was started again to continue the reaction.
• the amount of TFE monomer consumed in the reaction reached about 150 g
• the supply of TFE monomer was stopped, stirring was stopped, and the reaction was completed.
• the pressure inside the reactor was evacuated to normal pressure, and the contents were taken out from the reactor and cooled. The supernatant paraffin wax was removed from the PTFE aqueous dispersion.
• the solid content concentration of the obtained PTFE aqueous dispersion was 21.4% by mass, and the average primary particle diameter was 205 nm.
• the obtained PTFE aqueous dispersion was coagulated under high speed stirring conditions.
• the coagulated wet powder was dried at 150° C. for 18 hours. The results are shown in Table 3.
• the content of HFP units was determined by press-molding PTFE powder to produce a thin film disk, and based on the infrared absorbance obtained by FT-IR measurement of the thin film disk, the content was calculated as absorbance at 982 cm -1 / absorbance at 935 cm -1 . It was determined by multiplying the ratio by 0.3.
• Solid content concentration of aqueous dispersion containing PTFE 1 g of the aqueous dispersion was dried in a blow dryer at 150° C. for 60 minutes, and the ratio of the mass of the heated residue to the mass of the aqueous dispersion (1 g) was expressed as a percentage.
• a PTFE aqueous dispersion with a solid content concentration of about 1.0% by mass was prepared, and measured using ELSZ-1000S (manufactured by Otsuka Electronics Co., Ltd.) at 25° C. and a total of 70 times.
• the refractive index of the solvent (water) was 1.3328, and the viscosity of the solvent (water) was 0.8878 mPa ⁇ s.
• SSG Standard specific gravity
• Peak temperature The peak temperature is measured by accurately weighing approximately 10 mg of PTFE powder that has no history of being heated to a temperature of 300°C or higher, storing it in a special aluminum pan, and using a TG/DTA (differential thermogravimetry simultaneous measurement device). did. The peak temperature was determined by raising the temperature of an aluminum pan at a rate of 10°C/min from 25°C to 600°C in the air to obtain a differential thermal analysis (DTA) curve. ) The temperature corresponding to the maximum value in the curve was taken as the temperature.
• DTA differential thermal analysis
• the starting temperature for 0.1% decomposition is determined by accurately weighing out approximately 10 mg of PTFE powder, which has no history of being heated to a temperature of 300°C or higher, and storing it in a special aluminum pan. ).
• the 0.1% decomposition onset temperature was obtained by obtaining a decomposition (TG) curve by raising the temperature of an aluminum pan at a rate of 10°C/min from 25°C to 600°C in an air atmosphere. The temperature corresponded to a decomposition value of 0.1% in the decomposition (TG) curve.

Landscapes

• Chemical & Material Sciences (AREA)
• Health & Medical Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Medicinal Chemistry (AREA)
• Polymers & Plastics (AREA)
• Organic Chemistry (AREA)
• Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=88101027

Family Applications (1)

Country Status (3)

Citations (69)

Family Cites Families (2)

• 2023
  • 2023-03-17 JP JP2024510137A patent/JP7791483B2/ja active Active
  • 2023-03-17 EP EP23774824.9A patent/EP4497762A4/en active Pending
  • 2023-03-17 WO PCT/JP2023/010694 patent/WO2023182229A1/ja not_active Ceased

Patent Citations (73)