WO2020235515A1 - 水性塗工液用組成物 - Google Patents
水性塗工液用組成物 Download PDFInfo
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- WO2020235515A1 WO2020235515A1 PCT/JP2020/019577 JP2020019577W WO2020235515A1 WO 2020235515 A1 WO2020235515 A1 WO 2020235515A1 JP 2020019577 W JP2020019577 W JP 2020019577W WO 2020235515 A1 WO2020235515 A1 WO 2020235515A1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D133/00—Coating compositions based on 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 only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
- C09D133/02—Homopolymers or copolymers of acids; Metal or ammonium salts thereof
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D139/00—Coating compositions based on 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 single or double bond to nitrogen or by a heterocyclic ring containing nitrogen; Coating compositions based on derivatives of such polymers
- C09D139/02—Homopolymers or copolymers of vinylamine
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- 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
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/04—Acids; Metal salts or ammonium salts thereof
- C08F220/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
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- 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
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
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- 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
- C08F226/00—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 single or double bond to nitrogen or by a heterocyclic ring containing nitrogen
- C08F226/02—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 single or double bond to nitrogen or by a heterocyclic ring containing nitrogen by a single or double bond to nitrogen
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- 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
- C08F4/00—Polymerisation catalysts
- C08F4/04—Azo-compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
- C08L33/02—Homopolymers or copolymers of acids; Metal or ammonium salts thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L39/00—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 single or double bond to nitrogen or by a heterocyclic ring containing nitrogen; Compositions of derivatives of such polymers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D133/00—Coating compositions based on 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 only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
- C09D133/24—Homopolymers or copolymers of amides or imides
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D139/00—Coating compositions based on 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 single or double bond to nitrogen or by a heterocyclic ring containing nitrogen; Coating compositions based on derivatives of such polymers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
Definitions
- the present invention relates to a composition containing water, a copolymer of an N-vinylcarboxylic acid amide monomer and a monomer of an unsaturated carboxylic acid salt as a water-soluble polymer, and mainly comprises a water-soluble polymer.
- the present invention relates to a composition capable of forming an easily drying coated product on a construction surface in a coating liquid such as a coating material, an ink, an adhesive, a positive electrode, a negative electrode, and a separator of a lithium ion battery.
- the homopolymers and copolymers of N-vinylacetamide which is one of the polymers of the N-vinylcarboxylic acid amide monomer, have amphoteric properties and are likely to have high molecular weight and high viscosity. It is used for various purposes such as water-based inks and paints, thickening of various water-based compound coating liquids, film-forming, and adhesives. In particular, it is used as an adhesive, a paint, a building material, and a binder resin for a secondary battery in the personal care field such as pharmaceuticals and cosmetics, and the construction field and industrial field such as building materials.
- non-hydrophilic polymer emulsions and rubber latex may be used as water-based coating liquids in applications where filming properties are not expected, but the drying speed differs greatly when these are compared with water-soluble polymers.
- water-soluble polymers With water-soluble polymers, it has been a problem that it takes a long time to dry. Polymer emulsions and rubber latex cannot be expected to thicken as binders for coating, and there are many problems in that the coated surface is brittle.
- Patent Document 1 discloses a separator for a zinc secondary battery, which is a copolymer of a monomer having an N-vinylamide structure and a monomer having a carboxylic acid or a salt structure thereof.
- polyacrylic acid is 1 to 59.5% by mass
- N-vinylacetamide polymer is 0.1 to 30% by mass
- polyvalent metal is 0.05 to 1% by mass
- water is 40.
- a cooling composition containing in a proportion of ⁇ 80% by mass is disclosed.
- Patent Document 3 includes a group consisting of an unsaturated carboxylic acid monomer, a salt of an unsaturated carboxylic acid monomer, an unsaturated carboxylic acid ester monomer, a vinyl ester monomer, and an unsaturated nitrile monomer. It is a copolymer of at least one selected monomer and N-vinylacetamide, and the copolymer has the number of moles of a constituent unit derived from N-vinylacetamide and the unsaturated carboxylic acid monomer.
- the copolymers having a ratio to the number of moles of other structural units such as 1.00: 0.010 to 1.00: 0.250 are disclosed.
- Patent Document 1 describes a separator for a zinc secondary battery, but despite the fact that there is a drying step in the battery manufacturing process, the drying property and coatability of the copolymer are both disclosed and suggested. Absent. Patent Document 2 describes the adhesive strength of the medical patch, but does not disclose or suggest the drying property and the coatability. In Patent Document 3, although it is dried after polymerization and used as a binder, there is no disclosure or suggestion regarding the coatability and drying property of the aqueous solution.
- the present inventors have conducted an aqueous coating containing a copolymer of an N-vinylcarboxylic acid amide monomer and an unsaturated carboxylic acid salt monomer among water-soluble polymers. It has been found that the working solution has excellent drying property and can be sufficiently used for the above-mentioned applications, and the present invention has been completed.
- the configuration of the present invention is as follows.
- the N-vinylcarboxylic acid amide monomer and the unsaturated carboxylic acid salt monomer contain at least a copolymer and water, and the N-vinylcarboxylic acid amide monomer and the unsaturated carboxylic acid.
- the monomer of the salt has a molar ratio of 7.0: 93.0 to 93.0: 7.0, and the weight average molecular weight of the copolymer is 15,000 to 2,500,000.
- Composition for coating liquid [2] The composition for an aqueous coating liquid according to [1], wherein the copolymer has a Mw / Mn of 1.8 or more.
- the viscosity of the aqueous solution having a solid content of 5% by mass of the copolymer is 1,500 to 30,000 mPa ⁇ s, and the solid content concentration is 1 to 15% by mass.
- composition for an aqueous coating liquid is added to a copolymer of an N-vinylcarboxylic acid amide monomer and a monomer of an unsaturated carboxylic acid salt, and further, the weight of the N-vinylcarboxylic acid amide alone.
- a method for producing a water-soluble polymer coated product wherein the composition for an aqueous coating liquid according to any one of [1] to [9] is applied to the surface of a base material and dried.
- composition for an aqueous coating liquid of the present invention significantly improves the drying property when the composition is applied.
- compositions of the present invention are, of course, not limited to these.
- Composition for Aqueous Coating Solution The composition for an aqueous coating solution of the present invention is a copolymer formed by polymerizing at least a monomer of an N-vinylcarboxylic acid amide monomer and an unsaturated carboxylic acid salt. Contains water as an essential ingredient. Examples of the water-based coating liquid include adhesives, paints, inks, positive electrodes, negative electrodes, and separators of lithium ion batteries.
- each component will be described.
- Copolymer The copolymer used in the present invention is at least a copolymer of an N-vinylcarboxylic acid amide monomer and a monomer of an unsaturated carboxylic acid salt.
- N-vinylcarboxylic acid amide monomer is represented by the following formula (1).
- R 1 represents a hydrogen atom or a hydrocarbon group having 1 to 6 carbon atoms.
- R 2 represents a hydrogen atom or a hydrocarbon group having 1 to 6 carbon atoms.
- R 1 is NR 2.
- a ring structure may be formed with the above.
- Preferred R 1 is a hydrogen atom or a methyl group, and preferred R 2 is a hydrogen atom.
- Specific examples of the N-vinylcarboxylic acid amide monomer include N-vinylformamide, N-vinylacetamide, N-vinylpropionamide, N-vinylbenzamide, N-vinyl-N-methylformamide, and N-vinyl.
- N-vinylacetamide examples thereof include -N-ethylformamide, N-vinyl-N-methylacetamide, N-vinyl-N-ethylacetamide, and N-vinylpyrrolidone. Of these, N-vinylacetamide is particularly preferable. Two or more types of N-vinylcarboxylic acid amide monomers may be used in combination.
- the monomer of the unsaturated carboxylic acid salt is not particularly limited, and examples thereof include salts of itaconic acid, maleic acid, crotonic acid, and (meth) acrylic acid.
- salts of (meth) acrylic acid are preferable, and alkali metal salts of acrylic acid and ammonium salts of acrylic acid are particularly preferable.
- the alkali metal salt include lithium salt, sodium salt, potassium salt and the like.
- the ammonium salt may be an ammonium salt in which at least one hydrogen atom is substituted with alkyl, aryl or the like, but is preferably an ammonium salt.
- (meth) acrylic acid means acrylic acid and / or methacrylic acid.
- the polymerization inhibitor of the unsaturated carboxylic acid salt it is preferable to remove the polymerization inhibitor of the unsaturated carboxylic acid salt.
- Two or more kinds of unsaturated carboxylic acid salts may be used in combination.
- the molar ratio of the N-vinylcarboxylic acid amide monomer to the unsaturated carboxylic acid salt monomer in the copolymer is 7.0: 93.0 to 93.0: 7.0, which is more preferable.
- an aqueous copolymer having a viscosity applicable as a thickening coating material can be obtained.
- the copolymer of the present invention may contain a monomer other than the N-vinylcarboxylic acid amide monomer and the unsaturated carboxylic acid salt.
- a monomer other than the salt of the N-vinylcarboxylic acid amide monomer and the unsaturated carboxylic acid unsaturated carboxylic acid ester, unsaturated carboxylic acid amide, styrene-based monomer and the like are preferable.
- These monomers are preferably 30 mol% or less, more preferably 20 mol% or less, still more preferably 10 mol% or less, based on the total of N-vinylcarboxylic acid amide, acrylic acid and salts thereof. preferable. If it is 30 mol% or less, a high-viscosity polymer can be obtained, which is preferable.
- the high viscosity here means a composition having a viscosity of 10000 mPa ⁇ s or more in an aqueous solution having a solid content concentration of 5% by mass
- the medium viscosity means a viscosity of an aqueous solution having a solid content concentration of 5% by mass of 2000 mPa ⁇ s or more.
- a composition having a solid content concentration of 5% by mass is a composition having a viscosity of 10 mPa ⁇ s or more and less than 2000 mPa ⁇ s.
- the viscosity of the copolymer suitable for the present invention is 1500 to 30000 mPa ⁇ s, more preferably 2000 to 25000 mPa ⁇ s, still more preferably 3000 to 18000 mPa ⁇ s when measured in an aqueous solution having a solid content concentration of 5% by mass. Is.
- the viscosity of the copolymer is in this range, the condition of the coated product is good, and the proper stretching effect of the coating liquid can be obtained, so that it is easy to coat a large coating area per unit time.
- the drying speed is high, which is very advantageous in terms of productivity.
- the weight average molecular weight (Mw) of the copolymer of the present invention is 15,000 to 2,500,000, preferably 20,000 to 2,000,000, and more preferably 100,000 to 1,500. It is 000.
- Mw of the copolymer is 15,000 or more, the molecular weight is appropriate and a suitable thickening action and stretching effect can be obtained, so that a uniform thin film can be obtained and a good coated surface can be obtained. It has good drying properties.
- the Mw of the copolymer is 2.5 million or less, the thickening action on the liquid is appropriate, the effect of stretching the coating liquid is sufficiently obtained, and the coating film has an appropriate strength.
- the inorganic filler present in the coated material is stably fixed and has good drying property.
- the ratio (Mw / Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn), which is an index of the molecular weight distribution of the copolymer, is preferably 1.8 or more, more preferably 2.0 or more. , More preferably 2.2 or more.
- Mw / Mn is 1.8 or more, a sufficient stretching effect can be obtained, which is preferable because it can correspond to a wide shear rate at the time of coating.
- the concentration of the charged monomer is higher than that of polymerizing a monomer of an unsaturated carboxylic acid salt alone in an aqueous solution.
- a highly viscous product can be obtained even at a low concentration of less than 15% by mass.
- the (co) polymer obtained when polymerization is carried out at a high monomer concentration is partially or wholly gelled, and may be easily taken out from the reactor when there is a problem with the uniformity of the solution. It can be difficult. Once gelled, it is difficult to uniformly dissolve in water again.
- the stirring blade includes a turbine blade, a paddle blade, a propeller blade, an anchor blade, and a three-blade swept blade. In each case, an appropriate one may be used, but in the case of a high-viscosity polymer, an anchor blade is preferable, and in the case of medium to low viscosity, a three-blade swept blade is preferable.
- the copolymer of the present invention is produced with stirring to obtain a copolymer having a uniform and appropriate molecular weight distribution.
- a polymerization method in which the temperature inside the reaction system is kept constant and accompanied by continuous stirring is preferable, and the temperature range is preferably 30 to 80 ° C., more preferably 40 to 75 ° C., although it depends on the type of the polymerization initiator. , More preferably 50 to 70 ° C. By keeping the temperature in the system constant and keeping it within this temperature range, the desired molecular weight ratio can be made constant.
- polymerization initiator used for the polymerization of the copolymer of the present invention those generally used for radical polymerization of vinyl compounds can be used without limitation.
- examples thereof include a redox-based polymerization initiator, an azo compound-based polymerization initiator, and a peroxide-based polymerization initiator. These may be used alone or in combination of two or more. In some cases, a chain transfer agent may be used to adjust the molecular weight.
- the redox-based polymerization initiator is not limited, but is a combination of ammonium persulfate and sodium thiosulfate, sodium thiosulfate, trimethylamine, or tetramethylethylenediamine, or t-butyl hydroperoxide with sodium thiosulfate or sodium thiosulfate. The combination is preferred.
- Peroxide-based polymerization initiators are not limited, but are organic peroxides such as persulfates such as sodium, potassium and ammonium, benzoyl peroxide, lauroyl peroxide, caproyl peroxide, t-butylperoctate and diacetyl peroxide. The thing is preferable.
- the azo compound-based polymerization initiator is not limited, but is 2,2'-azobis (2-methylbutyronitrile), 2,2'-azobis (2,4-dimethylvaleronitrile), dimethyl-2,2'-azobis. (Isobutyrate), dimethyl-2,2'-azobis (2-methylbutyrate) and dimethyl-2,2'-azobis (2,4-dimethylpentanoate), 2,2'-azobis (2-amidinopropane) ) Dihydrochloride, 2,2'-azobis [2- (2-imidazolin-2-yl) propane] dihydrochloride, 2,2'-azobis [N- (2-carboxyethyl) -2-methylpropion amidine ] N hydrate, 2,2'-azobis ⁇ 2- [N- (2-carboxyethyl) amidino] propane ⁇ n hydrate, 2,2'-azobis (2-methylpropionic acid) dimethyl, 2, 2-azobis (2-methylpropionic acid)
- the polymerization method using water as a solvent contains halogen in consideration of the influence of the halogen residue in the polymer on the coating agent and electronic devices, heat resistance, especially thermal discoloration performance.
- a non-azo compound-based polymerization initiator that is, a non-halogen azo compound-based polymerization initiator.
- 2,2'-azobis [N- (carboxyethyl) -2-methylpropion amidine] tetrahydrate (trade name: manufactured by Fuji Film Wako Pure Chemical Industries, Ltd., azo compound-based polymerization initiator VA-057) ) Is most preferable.
- the amount of the radical polymerization initiator used is preferably 0.05 parts by mass or more and 2.0 parts by mass or less in the case of the azo compound-based polymerization initiator with respect to 100 parts by mass in total of all the monomers. It is 0.1 part by mass or more and 0.8 part by mass or less, and more preferably 0.4 part by mass or more and 0.7 part by mass or less. In the case of a redox-based polymerization initiator, it is preferably 0.001 part by mass or more and 0.03 part by mass or less, and more preferably 0.003 part by mass or more and 0.01 part by mass or less with respect to 100 parts by mass of all the monomers. More preferably, it is 0.004 part by mass or more and 0.009 part by mass or less. When the amount of the radical polymerization initiator used is within the above range, both the polymerization rate and the molecular weight of the copolymer tend to be suitable.
- a chain transfer agent may be used at the time of copolymerization for the purpose of adjusting the degree of polymerization of the copolymer and for introducing a modifying group at the end of the copolymer.
- the chain transfer agent include aldehyde compounds such as acetaldehyde and propionaldehyde, ketone compounds such as acetone and methyl ethyl ketone, thiol compounds such as 2-hydroxyethanethiol, 3-mercaptopropionic acid, dodecanethiol and thioacetic acid, and tetrachloride.
- Examples thereof include halogenated hydrocarbon compounds such as carbon, trichloroethylene and perchloroethylene, and phosphinates such as sodium phosphite monohydrate.
- halogenated hydrocarbon compounds such as carbon, trichloroethylene and perchloroethylene
- phosphinates such as sodium phosphite monohydrate.
- thiol compounds, aldehyde compounds, and ketone compounds are preferably used.
- the amount of the chain transfer agent added is preferably 0.1 part by mass or more and 2.0 parts by mass or less with respect to 100 parts by mass in total of all the monomers. Within this range, the degree of polymerization can be adjusted and a modifying group can be introduced at the end of the polymer.
- composition for Aqueous Coating Solution In the composition for aqueous coating solution of the present invention, at least a copolymer of N-vinylcarboxylic acid amide and a salt of unsaturated carboxylic acid is dissolved in a solvent containing at least water. Composition.
- Water is used as the solvent, but a mixed solvent in which water and alcohols are mixed may be used.
- alcohols are mixed, they are preferably contained in the solvent in an amount of less than 50% by mass. It is preferable to use only water in terms of cost, manufacturing control and waste treatment.
- the sum of the mass of the N-vinylcarboxylic acid amide monomer and the mass of the monomer of the unsaturated carboxylic acid salt is preferably 20 parts by mass or less, and more preferably 15 parts by mass or less with respect to the solvent. If the sum of the mass of the N-vinylcarboxylic acid amide monomer and the mass of the monomer of the unsaturated carboxylic acid salt is less than or equal to the mass of the solvent, the copolymer gels in the solvent. It is preferable because it does not require a remelting step.
- the composition for an aqueous coating liquid of the present invention may contain a homopolymer in addition to the copolymer.
- the homopolymer include N-vinylformamide, N-vinylacetamide, N-vinylpropionamide, N-vinylbenzamide, N-vinyl-N-methylformamide, N-vinyl-N-ethylformamide, and N-vinyl-N.
- a homopolymer of N-vinylcarboxylic acid amide such as -methylacetamide, N-vinyl-N-ethylacetamide, and N-vinylpyrrolidone is preferable, and a homopolymer of N-vinylacetamide is particularly preferable.
- the ratio of the copolymer to the homopolymer is preferably 3:97 to 97: 3, more preferably 5:95 to 95: 5, and even more preferably 7:93 to the mass ratio of the solid content. It is 93: 7. If it is within the above range, the drying time can be maintained, which is preferable.
- the composition for an aqueous coating liquid of the present invention is preferably in a state in which the inorganic fillers are dispersed and homogenized to the form of primary particles.
- the copolymer has a weaker cohesive force such as hydrogen bonds involved in hydrophilicity than the homopolymer, and the copolymer is uniformly adsorbed on the particle surface of the inorganic filler to charge the copolymer.
- the dispersion effect is continued by the repulsive force such as the repulsive force, reaggregation is unlikely to occur even during drying, and the copolymer is uniformly distributed on the surface of the porous particles, so that the variation in the heat-treated state during drying is suppressed. It is presumed that.
- the ratio of copolymer and water is preferably 1.0 to 20.0 parts by mass of the copolymer with respect to 100 parts by mass of water, and more preferably 3.0 to 15. It is 0 parts, more preferably 5.0 to 12.0 parts by mass.
- the copolymer can be obtained as an aqueous solution, which is preferable.
- -Inorganic filler The inorganic filler is preferably contained in the aqueous coating liquid composition in order to impart heat resistance to the dried product of the aqueous coating liquid composition. It is considered that the composition for the aqueous coating liquid contains the inorganic filler, so that the composition is dispersed and homogenized to the form of the primary particles.
- the inorganic filler used is not particularly limited, and is limited to boron nitride, aluminum nitride, silicon carbide, silica, alumina (aluminum oxide), boehmite (hydrate of aluminum oxide), talc, zinc oxide, titanium oxide, titanium black and the like. It is possible to list at least one selected from the group consisting of graphite. Of these, alumina and boehmite are preferable in terms of reinforcing property and heat dissipation to the coated base material, and easy availability.
- the ratio of the copolymer and the inorganic filler is preferably 0.1 to 20.0 parts by mass of the solid content of the copolymer with respect to 100 parts by mass of the inorganic filler, which is more preferable. Is 0.5 to 10.0 parts by mass, more preferably 1.0 to 5.0 parts by mass.
- the solid content of the copolymer was determined by multiplying the amount of the composition substance for the aqueous coating liquid by the solid content concentration.
- the method of mixing the copolymer and the inorganic filler is not particularly limited, but in order to obtain a more uniform mixed state, the copolymer and other water-soluble materials are dissolved in a solvent containing at least water. After that, it is preferable to add and mix the inorganic filler. Further, it is more preferable that the aqueous solution in which the copolymer and other water-soluble materials are dissolved is continuously stirred, and the inorganic filler is sequentially added, stirred and mixed, and homogenized. This makes it possible to take an ideal mixed form.
- the content of the inorganic filler is preferably in the range of 70% by mass or less, more preferably 20 to 60% by mass, and further preferably 30 to 55% by mass with respect to the total mass of the composition. Within this range, it can be effective in promoting the drying of the composition.
- -Ratio of inorganic filler to water The ratio of inorganic filler to water is preferably 10.0 to 300.0 parts by mass, more preferably 30.0 to 200.0 parts by mass with respect to 100 parts by mass of water. It is a part, more preferably 50.0 to 100.0 parts by mass. When it is in this range, good fluidity of the composition for an aqueous coating liquid can be obtained, which is preferable.
- the composition for an aqueous coating liquid is applied to the surface of a base material and dried to produce a coated product.
- the copolymer containing the N-vinylcarboxylic acid amide and the unsaturated carboxylic acid salt in the present invention and the composition containing at least water are the salts of the N-vinylcarboxylic acid amide and the unsaturated carboxylic acid. It is possible to provide a coating / drying method that significantly shortens the drying time as compared with a composition containing a copolymer containing neither of them.
- the method of applying the composition to the substrate is not particularly limited, but in addition to spray coating, roll coating, bar coating, gravure coating, die coating, knife coating, inkjet coating, brush coating, dip coating, etc., roll to roll It is also possible to apply continuously using a pattern coating device.
- composition may contain a known material to be added to the paint in addition to the above.
- a known material to be added to the paint in addition to the above.
- an emulsion binder, a thixotropic agent, a dispersant, a surface conditioner, a defoaming agent, and a leveling agent. May include.
- a film, a non-woven fabric, a porous body, a plate-shaped body, or the like can be used without particular limitation.
- Materials constituting the base material include homopolypropylene, copolymers of propylene and other olefins, polyethylene terephthalate, polyethylene naphthalate, polyamide ether ketone, polyimide, polyamide, polyphenylene sulfone, polyphenylene ether, polyethylene, polyether sulfone, and the like.
- Organic resin materials such as polyetheretherketone, polybenzoimidazole, polyetherimide, polyamideimide, poly (p-phenylene-2,6-benzobisoxazole), fluororesin, epoxy resin, aluminum, copper, silver, iron, etc.
- Metal materials, glass (silicon oxide), alumina, magnesia, aluminum nitride, aluminum carbide, silicon nitride, barium titanate and other inorganic materials can be mentioned.
- the base material one type may be used alone, or two or more types may be used in combination.
- the drying method is not particularly limited, and examples thereof include spin drying, vacuum drying, warm air drying, and infrared drying.
- the drying time is also not particularly limited, but according to the present invention, the drying time is 95% by mass, which will be described later, at a rate of 1/3 to 1/10 as compared with the case where the polymer of N-vinylacetamide is dried alone. The drying time can be shortened.
- a beaker was placed in a constant temperature water tank whose temperature was adjusted to 20 ° C., and it was confirmed with a thermometer that the temperature of the specimen was 20 ⁇ 0.5 ° C., and a B-type viscometer shown in JIS K-7117-1-1999. The viscosity is measured under the following conditions using. Place the sample on a viscometer and record the viscosity 10 minutes later.
- Solid content concentration (mass%) 100 ⁇ (M3-M1) ⁇ (M2-M1) M1: Aluminum cup mass (g) M2: Sample mass before drying + aluminum cup mass (g) M3: Sample mass after drying + aluminum cup mass (g) ⁇ Absolute molecular weight measurement of standard polymer for GPC calibration curve creation> Each of the N-vinylacetamide polymer, the N-vinylacetamide-sodium acrylate copolymer, and the sodium acrylate polymer in each molecular weight band was dissolved in an eluent and allowed to stand for 20 hours. The solid content concentration in this solution is 0.05% by mass.
- the weight average molecular weight and the number average molecular weight in this measurement are the above-mentioned multi-angle light for each of the N-vinylacetamide polymer, N-vinylacetamide-sodium acrylate copolymer, and sodium acrylate polymer in each molecular weight band.
- a calibration curve created from the results of absolute molecular weight measurement using a scattering detector was used.
- Detector (RI): Showa Denko SHODEX (registered trademark) RI-201H Pump: LC-20AD manufactured by Shimadzu Corporation Column oven: Showa Denko SHODEX (registered trademark) AO-30C Analytical device: SIC 480II Data Station manufactured by System Instruments Co., Ltd.
- composition for an aqueous coating liquid was adjusted with ion-exchanged water so that the solid content concentration was 5.0% by mass.
- the evaporation time until the water is substantially evaporated which is 95% by mass less than the initial mass at 85 ° C. is measured at 1-minute intervals. The following judgment was made based on the time required for the mass to decrease by 95% by mass from the initial mass.
- the mixture was mixed with a rotation / revolution type kneader (ARE-250 manufactured by Shinky Co., Ltd.) under the conditions of mixing (mixing) for 60 seconds and defoaming (defoaming) for 60 seconds.
- the obtained slurry solution was filled in a 100 ml polypropylene container with a tight stopper and allowed to stand in a constant temperature bath at 20 ° C. for 6 hours or more to obtain a composition for an aqueous coating solution containing an inorganic filler.
- 1.5 g of the composition for an aqueous coating liquid containing an inorganic filler is collected and placed on an aluminum cup (bottom area 22 cm 2 ), and spread smoothly and evenly on the bottom surface of the aluminum cup with a spoon.
- a hot balance manufactured by METTLER TOLEDO Co., Ltd., PM460
- the evaporation time until the water is substantially evaporated is measured at 1-minute intervals, which is 59% by mass less than the initial mass at 85 ° C.
- a polypropylene sheet (width: 100 mm ⁇ length: 300 mm ⁇ ) in which 5 g of the obtained composition for water-based coating liquid or composition for water-based coating liquid containing an inorganic filler is fixed to a coating table of a coating machine with double-sided tape. Put it on a (thickness: 30 ⁇ m) and use a bar coater (Yoshimitsu Seiki Co., Ltd. width: 70 mm x thickness: 50 ⁇ m) with an automatic coating machine (Pi-1210 manufactured by Tester Sangyo Co., Ltd.) at a speed of 400 mm / sec. The length was 300 mm.
- the evaluation was performed according to the following criteria. ⁇ : The coated surface is uniform as a whole ⁇ : No conspicuous agglomerates are seen, but the area of the coated surface is 10% or less and there are blurred parts and pinholes with a diameter of 3 mm or less ⁇ : The area of the coated surface is 10% As mentioned above, many agglomerates with a diameter of 3 mm or more are seen, and 10% or more of the coated surface cannot be coated.
- aqueous coating liquid composition or inorganic filler-containing aqueous coating liquid diluted with ion-exchanged water to a solid content concentration of 5% by mass on a polypropylene vat (length: 25 cm x width: 14 cm x height: 4 cm) 30 g of the composition is stretched to a smooth state and dried in an air oven at a temperature of 50 ° C. for 24 hours.
- the state of the dried film was evaluated according to the following criteria. The evaluation was performed according to the following criteria. ⁇ : Film in a uniform state ⁇ : Film in which holes or chips are partially seen ⁇ : Film cannot be formed and becomes fragments, or a smooth and uniform film cannot be obtained ⁇ Yellowness> Diluted with ion-exchanged water so that the copolymer concentration was 5.0% by mass, 100 g of the copolymer aqueous solution was placed in a glass bottle with a closed stopper having a capacity of 150 ml, sealed, and exposed at 98 ° C. for 72 hours in an air oven. ..
- the yellowness (yellowness index) of the copolymer aqueous solution after exposure is measured with a colorimetric color difference meter (ZE6000 manufactured by Nippon Denshoku Industries Co., Ltd.) in accordance with the reflection method of JIS-K7373: 2006. It was measured.
- ZE6000 manufactured by Nippon Denshoku Industries Co., Ltd.
- the polymerization initiator 2,2'-azobis [N- (Carboxyethyl) -2-methylpropion amidine] 1.0 g of tetrahydrate (hereinafter referred to as VA-057) (1.0 part by mass of total monomer ratio) was dissolved in 9 g of ion-exchanged water degassed with nitrogen gas. The aqueous solution was added with a syringe.
- Anchor blades are attached to a three-one motor (registered trademark) (high-power general-purpose stirrer BLh600 manufactured by Shinto Kagaku Co., Ltd.) at an internal temperature of 68 ° C. After 1 hour of raising, it was confirmed that the sum of the concentrations of N-vinylacetamide and sodium acrylate monomer was 1000 mass ppm or less, and the reaction was cooled with ice to terminate the reaction to obtain a composition for an aqueous coating liquid. It was.
- a three-one motor registered trademark
- the weight average molecular weight of the obtained N-vinylacetamide copolymer was 1,170,000.
- the viscosity of the aqueous solution diluted with 1000 g of ion-exchanged water (nitrogen gas bubbling for 2 days) was 28,000 mPa ⁇ s so that the solid content concentration was 5% by mass.
- a nitrogen gas insertion tube, agitator, a solvent dropping device, and a thermometer are attached to a 4-port 1L separable flask, and 500 g of ion-exchanged water (nitrogen gas degassed for 2 days) is charged into the separable flask and into the solution.
- an aqueous solution prepared by dissolving 50 g of N-vinylacetamide monomer (manufactured by Showa Denko Co., Ltd.) and 50 g of sodium acrylate monomer (manufactured by Showa Denko Co., Ltd.) in 50 g of ion-exchanged water degassed with nitrogen gas. And 340 g of ion-exchanged water degassed with nitrogen gas were mixed, and an aqueous solution was added dropwise over 2 hours with a pump. After the dropping was completed, 68 ° C. was maintained for 2 hours, and when the internal temperature was further raised to 75 ° C.
- Examples 3 to 5 Comparative Examples 1, 3, 4, 7, 8
- the procedure was the same as in Example 1 except that the reagents, the amount charged, the reaction time, and the reaction temperature shown in Table 1 were used.
- Example 6 In a 200 ml separable flask, 10 g of the composition for the aqueous coating solution produced in Example 1 and 90 g of the composition for the aqueous coating solution produced in Comparative Example 1 were placed, and the three-one motor (Shinto Kagaku Co., Ltd.) was placed at 20 ° C. Anchor blades were attached to a high-power general-purpose stirrer BLh600), and the mixture was mixed at 150 rpm for 60 minutes.
- the three-one motor Shinto Kagaku Co., Ltd.
- Example 7 and 8 The same procedure as in Example 6 was carried out except that the amount charged was as shown in Table 2.
- Comparative Example 2 The procedure was carried out in the same manner as in Example 2 except that the reagents and charging amounts shown in Table 1 were used.
- the polymerization peak temperature at this time was 75 ° C., and the temperature at the end was 35 ° C.
- the polymerized agar-like gel was taken out from the separable flask and cut, dried and pulverized to obtain a powder copolymer.
- the residual monomer concentration of the obtained powder copolymer was confirmed.
- the solid content concentration of the powder copolymer was 99.5% by mass.
- the powder copolymer was dissolved in ion-exchanged water to obtain a composition for an aqueous coating liquid having a solid content concentration of 5.0% by mass.
- V-50 2,2'-azobis (2-amidinopropane) dihydrochloride, Fuji Film Wako Pure Chemical Industries, Ltd.
- VA-044 2,2'azobis [2- (2-imidazolin-2-yl) propane ] Dihydrochloride, manufactured by Fuji Film Wako Pure Chemical Industries, Ltd.
- compositions for an aqueous coating solution containing the N-vinylcarboxylic acid amide monomer shown in Examples 1 to 5 in which a monomer of an unsaturated carboxylic acid salt is copolymerized are referred to in Comparative Examples 1 to 3.
- the evaporation time is shorter than that of the composition for an aqueous coating solution containing the homopolymer of the N-vinylcarboxylic acid amide monomer shown.
- composition for an aqueous coating solution containing the composition has a shorter evaporation time than the composition for an aqueous coating solution containing a homopolymer of an N-vinylcarboxylic acid amide monomer.
- the excellent coating property and coating property of the composition for an aqueous coating liquid containing the homopolymer of the N-vinylacetamide monomer shown in Comparative Example 1 are such that the N-vinylcarboxylic acid amide monomer is unsaturated carboxylic acid. It is also maintained in compositions for aqueous coating solutions (shown in Examples 1-8) containing monomers of acid salts.
- Comparative Example 4 which is a composition for an aqueous coating solution containing a homopolymerized product of a monomer of an unsaturated carboxylic acid salt
- the viscosity is lower than that of Examples 1 to 3
- the molecular weight is low
- the drying property and coating property are good. , Poor coatability.
- the statically polymerized products of Comparative Examples 5 and 6 have a high molecular weight, and the composition for an aqueous coating solution containing the statically polymerized product is inferior in coatability and drying property.
- Examples 1 to 3 are superior in drying time, filmability, and coatability even in the state where the inorganic filler is blended, as compared with Comparative Examples 1, 4, 5, and 7. Further, as shown in Comparative Examples 7 and 8, the molar ratio of the N-vinylcarboxylic acid amide monomer and the monomer of the unsaturated carboxylic acid salt was 7.0: 93.0 to 93.0: 7.
- the composition for an aqueous coating solution containing a copolymer polymerized at a value other than 0 has a longer evaporation time than Examples 1 to 5.
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Abstract
Description
しかしながら、設備的な改良は費用が莫大となることが多く、また乾燥条件の適正化である乾燥温度上昇や乾燥風量増加は被膜に与える影響も大きく限界があり、消費エネルギーの増大にもつながる。
特許文献2には、医療用貼付剤の粘着力に関する記述はあるが、乾燥性および塗工性については開示も示唆もない。
特許文献3では、重合後に乾燥してバインダーに用いているものの、水溶液の塗工性や乾燥性については、開示も示唆もない。
[1]N-ビニルカルボン酸アミド単量体と不飽和カルボン酸の塩の単量体との共重合体と水を少なくとも含み、前記N-ビニルカルボン酸アミド単量体と前記不飽和カルボン酸の塩の単量体のモル比が7.0:93.0~93.0:7.0であり、前記共重合体の重量平均分子量が15,000~2,500,000である、水性塗工液用組成物。
[2]前記共重合体のMw/Mnが1.8以上であることを特徴とする、[1]に記載の水性塗工液用組成物。
[3]更に無機フィラーを含む、[1]または[2]に記載の水性塗工液用組成物。
[4]前記N-ビニルカルボン酸アミド単量体がN-ビニルアセトアミド単量体である[1]~[3]のいずれかに記載の水性塗工液用組成物。
[5]前記共重合体の固形分濃度5質量%水溶液の粘度が1,500~30,000mPa・sであり、固形分濃度が1~15質量%である、[1]~[4]のいずれかに記載の水性塗工液用組成物。
[6]前記不飽和カルボン酸の塩の単量体が(メタ)アクリル酸の塩である、[1]~[5]のいずれかに記載の水性塗工液用組成物。
[7]前記水100質量部に対し前記共重合体を1.0~20.0質量部含む、[1]~[6]のいずれかに記載の水性塗工液用組成物。
[8]前記無機フィラーが、アルミナまたはベーマイトのうち少なくとも一つである、[3]~[7]のいずれかに記載の水性塗工液用組成物。
[9]前記水性塗工液用組成物が、N-ビニルカルボン酸アミド単量体と不飽和カルボン酸の塩の単量体との共重合体に加え、更にN-ビニルカルボン酸アミド単独重合体を含む、[1]~[8]のいずれかに記載の水性塗工液用組成物。
[10]基材表面に、[1]~[9]のいずれかに記載の水性塗工液用組成物を塗布し、乾燥する、水溶性高分子塗工物の製造方法。
[11]ノンハロゲンアゾ化合物系重合開始剤を使用してラジカル重合を行う、[1]~[9]のいずれかに記載の水性塗工液用組成物の製造方法
[12]撹拌重合にて重合を行う、[1]~[9]のいずれかに記載の水性塗工液用組成物の製造方法。
水性塗工液用組成物
本発明の水性塗工液用組成物は、少なくとも、N-ビニルカルボン酸アミド単量体と不飽和カルボン酸の塩の単量体を重合してなる共重合体、水を必須成分として含有する。水性塗工液としては、接着剤、塗料、インク、リチウムイオン電池の正極、負極、セパレータ等があげられる。以下、各成分について説明する。
共重合体
本発明に使用する共重合体は、少なくともN-ビニルカルボン酸アミド単量体と不飽和カルボン酸の塩の単量体を共重合したものが使用される。
N-ビニルカルボン酸アミド単量体としては、具体例には、N-ビニルホルムアミド、N-ビニルアセトアミド、N-ビニルプロピオンアミド、N-ビニルベンズアミド、N-ビニル-N-メチルホルムアミド、N-ビニル-N-エチルホルムアミド、N-ビニル-N-メチルアセトアミド、N-ビニル-N-エチルアセトアミド、N-ビニルピロリドンなどが挙げられる。このうち、N-ビニルアセトアミドが特に好ましい。なお、2種類以上のN-ビニルカルボン酸アミド単量体を組み合わせて用いても良い。
これらの中で、(メタ)アクリル酸の塩が好ましく、中でもアクリル酸のアルカリ金属塩、アクリル酸のアンモニウム塩が好ましい。アルカリ金属塩としては、リチウム塩、ナトリウム塩、カリウム塩などが挙げられる。またアンモニウム塩は、水素原子の少なくとも1つアルキルやアリールなどで置換された、アンモニウム塩でもよいが好ましくはアンモニウム塩である。なお、本発明において(メタ)アクリル酸は、アクリル酸および/またはメタクリル酸を意味する。
共重合体中の、N-ビニルカルボン酸アミド単量体と不飽和カルボン酸の塩の単量体のモル比は7.0:93.0~93.0:7.0であり、より好ましくは8.0:92.0~60.0:40.0であり、更に好ましくは10.0:90.0~50.0:50.0である。上記範囲にあることで、増粘塗工材として適用可能な粘度の水溶液共重合体が得られる。
N-ビニルカルボン酸アミド単量体と不飽和カルボン酸の塩以外の単量体としては、不飽和カルボン酸エステル、不飽和カルボン酸アミド、スチレン系単量体等が好ましい。これらの単量体は、好ましくはN-ビニルカルボン酸アミドとアクリル酸およびその塩との合計に対して30モル%以下が好ましく、より好ましくは20モル%以下、さらに好ましくは10モル%以下が好ましい。30モル%以下であれば、高粘度の重合体を得ることができ好ましい。
重合形態としては溶液重合、滴下重合が適用可能であり、水溶性ラジカル重合開始剤を使用し連鎖移動作用の低い水媒体を使用した水溶液中でのラジカル重合が適している。
共重合体の粘度がこの範囲にある場合、塗工物の状態が良好となり、さらに塗工液の適正な引き延ばし効果が得られるため、単位時間当たり多くの塗工面積を塗工することが容易となり、かつ乾燥速度ついても速いことから生産性においても非常に有利である。
攪拌は、モーター、軸シャフト、撹拌翼を持ち合わせた装置にて反応系内を混合するものがより好ましく、重合反応の進行状態により撹拌回転数を可変できるものが特に好ましい。撹拌翼の形状についてはタービン翼、パドル翼、プロペラ翼、アンカー翼、三枚後退翼などがある。それぞれの場合において適正ものを使用すればよいが高粘度の重合体の場合はアンカー翼が好適であり、中~低粘度の場合は三枚後退翼が好適である。
反応系内温度を一定に保ち、継続的な撹拌を伴う重合方法が好ましく、温度の範囲は重合開始剤の種類にもよるが、好ましくは30~80℃であり、より好ましくは40~75℃、さらに好ましくは50~70℃である。系内温度を一定に保ち、またこの温度範囲とすることで、所望の分子量比率を一定とすることができる。
これらは、1種を単独で使用してもよいし、2種以上を併用してもよい。場合によっては、連鎖移動剤を用いて分子量調整を行ってもよい。
水
水は特に限定されずに蒸留水、イオン交換水、水道水などが使用できるが、イオン交換水が好ましい。
水性塗工液用組成物
本発明の水性塗工液用組成物は、少なくともN-ビニルカルボン酸アミドと不飽和カルボン酸の塩の共重合体とが、少なくとも水を含む溶媒中に溶解してなる組成物である。
また、共重合体は単独重合体よりも親水性に関与する水素結合などの凝集性力が弱くなり、その共重合体が無機フィラーの粒子表面に均一に吸着することで共重合体の電荷の反発力を始めとする斥力により分散効果が継続され、乾燥時にも再凝集が起こりにくく、共重合体が多孔質の粒子表面に均一に分布することで乾燥時の被熱状態のバラつきが抑制されると推測される。その結果、水を離しやすくなり、乾燥しやすくなるものと考えられる。
・共重合体と水との比率
共重合体と水の比率は、好ましくは水100質量部に対し共重合体1.0~20.0質量部であり、より好ましくは3.0~15.0部であり、更に好ましくは5.0~12.0質量部である。水100質量部に対し共重合体20.0質量部以下であれば、共重合体が水溶液として得られ好ましい。
・無機フィラー
無機フィラーは、水性塗工液用組成物の乾燥物に耐熱性を付与するために、前記水性塗工液用組成物に含まれることが好ましい。水性塗工液用組成物に無機フィラーが含まれることで、一次粒子の形態まで分散、均一化された状態であると考えられる。
・共重合体と無機フィラーの比率
共重合体と無機フィラーとの比率は、好ましくは無機フィラー100質量部に対し共重合体の固形分が0.1~20.0質量部であり、より好ましくは0.5~10.0質量部であり、更に好ましくは1.0~5.0質量部である。なお共重合体の固形分は、水性塗工液用組成物質量に固形分濃度を掛けて求めた。
・無機フィラーと水との比率
無機フィラーと水との比率については、好ましくは水100質量部に対して無機フィラー10.0~300.0質量部、より好ましくは30.0~200.0質量部であり、さらに好ましくは50.0~100.0質量部である。この範囲にあると、水性塗工液用組成物の良好な流動性が得られ好ましい。
換言すれば、本発明でのN-ビニルカルボン酸アミドおよび不飽和カルボン酸の塩を含む共重合体と、少なくとも水を含む組成物は、N-ビニルカルボン酸アミドおよび不飽和カルボン酸の塩のいずれかを含まない共重合体を含む組成物に比べて、著しく乾燥時間を短縮させる、塗工・乾燥方法を提供できる。
基材を構成する材料としては、ホモポリプロピレン、プロピレンと他のオレフィンとの共重合体、ポリエチレンテレフタレート、ポリエチレンナフタレート、ポリアミドエーテルケトン、ポリイミド、ポリアミド、ポリフェニレンスルホン、ポリフェニレンエーテル、ポリエチレン、ポリエーテルスルホン、ポリエーテルエーテルケトン、ポリベンゾイミダゾール、ポリエーテルイミド、ポリアミドイミド、ポリ(p‐フェニレン-2,6-ベンゾビスオキサゾール)、フッ素樹脂、エポキシ樹脂などの有機樹脂材料、アルミニウム、銅、銀、鉄などの金属材料、ガラス(酸化珪素)、アルミナ、マグネシア、窒化アルミニウム、炭化アルミニウム、窒化ケイ素、チタン酸バリウムなどの無機材料が挙げられる。基材は、1種類を単独で用いても、2種類以上を組み合わせて用いても構わない。
乾燥時間も、特に制限されないが、本発明によれば、N-ビニルアセトアミドの重合体単独で乾燥する場合に比べて、後述の95質量%乾燥時間で、1/3~1/10の割合で乾燥時間を短縮できる。
<粘度>
水性塗工液用組成物の固形分濃度が5.0質量%となるよう、イオン交換水にて希釈し、500mlのトールビーカーに入れ、12時間以上20℃の恒温槽に静置し内部の気泡が完全に無い状態とする。その後、20℃に調温された恒温水槽にビーカーを入れ温度計にて試験体温度が20±0.5℃であることを確認し、JIS K-7117-1-1999に示すB型粘度計を用いて以下の条件にて粘度を測定する。試料を粘度計に設置して10分後の粘度を記録する。
温度:20℃
・5,000mPa・s以上のとき
粘度計:DVE(ブルックフィールド)粘度計 HA型
スピンドル:No.6スピンドル
・5,000mPa・s未満のとき
粘度計:DVE(ブルックフィールド)粘度計 LV型
スピンドル:No.4スピンドル
<固形分濃度>
サンプルの水性塗工液用組成物約3.0g採取し、アルミカップ(底面積22cm2)に乗せ、薬さじでアルミカップ底部に平滑に均一に広げ熱天秤(メトラー・トレド株式会社製:PM460)にて140℃、90分間加熱乾燥し、冷却後の質量を測定し以下の式にて固形分濃度を測定した。
固形分濃度(質量%)=100×(M3 - M1)÷(M2 - M1)
M1:アルミカップ質量(g)
M2:乾燥前の試料質量+アルミカップ質量(g)
M3:乾燥後の試料質量+アルミカップ質量(g)
<GPC較正曲線作成用標準重合体の絶対分子量測定>
各分子量帯のN-ビニルアセトアミド重合体、N-ビニルアセトアミドーアクリル酸ナトリウム共重合体、アクリル酸ナトリウム重合体それぞれを溶離液に溶解させ、20時間静置した。この溶液における固形分濃度は0.05質量%である。
GPC:昭和電工株式会社製Shodex(登録商標)SYSTEM21
カラム:昭和電工株式会社製Shodex(登録商標) LB-80
カラム温度:40℃
溶離液:0.1mol/L NaH2PO4+0.1mol/L Na2HPO4
流速:0.64mL/min
試料注入量:100μL
MALS検出器:ワイアットテクノロジーコーポレーション製、DAWN(登録商標) DSP
レーザー波長:633nm
多角度フィット法:Berry法
<Mw/Mn>
固形分濃度が0.1質量%濃度となるよう、水性塗工液用組成物を蒸留水にて希釈し、以下の条件でGPC(ゲル透過クロマトグラフィー)法にて重量平均分子量Mwおよび数平均分子量Mnを測定し、その比を算出した。
ポンプ:株式会社島津製作所製 LC-20AD
カラムオーブン:昭和電工株式会社製 SHODEX(登録商標) AO-30C
解析装置:システムインスツルメンツ株式会社製 SIC 480II Deta Station
カラム:昭和電工株式会社製 SHODEX(登録商標) SB806 (2本)
溶離液:蒸留水/2-プロパノール=8/2(質量比)
流量:0.7ml/min
<残留単量体測定>
水性塗工液用組成物を、濃度0.05mol/Lの硫酸ナトリウム(Na2SO4)水溶液に溶解し、固形分濃度が0.01質量%の溶液を得た。そして、この溶液をGPC法にて分析し、重合体試料中に残留する各種単量体の総量(残留単量体量)を算出した。この残留単量体量により、重合反応が完了したか否かを確認することができる。
検出器(RI):昭和電工株式会社製SHODEX(登録商標) RI-61
ポンプ:昭和電工株式会社製SHODEX(登録商標) DS-4
カラムオーブン:スガイ製 U-620 40℃
解析装置:株式会社島津製作所製 C―R7A Plus
カラム:昭和電工株式会社製SHODEX(登録商標) SB802.5HQ×1本
溶離液:0.5mol/L Na2SO4水溶液 流量1.0ml/min
濃度は、検量線法(サンプル濃度:1、5、10、100質量ppm)にて求めた。
<95質量%蒸発時間>
水性塗工液用組成物を、固形分濃度を5.0質量%になるようにイオン交換水にて調整した。アルミカップ(底面積22cm2)に水性塗工液用組成物を、1.5g採取して乗せ、薬さじでアルミカップの底面へ平滑に均一に広げる。
当初の質量から95質量%減少するまでの所要時間により、以下の判定とした。
A:40分以下
B:40分超45分以下
C:45分超50分以下
D:50分超
<59質量%蒸発時間>
無機フィラー混合(無機フィラー含有水性塗工液用組成物の作製)
200mlの自転公転型混練機用ポリエチレン製容器に、固形分濃度を5質量%濃度になるようイオン交換水にて調整した水性塗工液用組成物20gを入れ、次いでアルミナ(昭和電工製:AL-160SG)を40g、さらにイオン交換水40gを入れ密栓した。
得られたスラリー溶液は密栓つき100mlポリプロピレン製容器に充填し、20℃恒温槽に6時間以上静置し、無機フィラー含有水性塗工液用組成物を得た。
熱天秤(メトラー・トレド株式会社製、PM460)にて85℃で当初の質量から59質量%減少、即ち水がほぼ蒸発するまでの蒸発時間を1分間隔にて測定する。
A:20分以下
B:20分超25分以下
C:25分超30分以下
D:30分超
<塗工性評価>
得られた水性塗工液用組成物または無機フィラー含有水性塗工液用組成物5gを、塗工機の塗工台に両面テープにて固定したポリプロピレンシート(幅:100mm×長さ:300mm×厚さ:30μm)に乗せ、バーコーター(ヨシミツ精機株式会社製 幅:70mm×厚さ:50μm)を使用して自動塗工機(テスター産業株式会社製 Pi-1210)にて400mm/秒の速度にて長さ300mm塗工した。
○:全体的に均一な塗工面ではある
△:目立った凝集物など見られないが、塗工面の面積10%以下でかすれ部位や直径3mm以下のピンホールがある
×:塗工面の面積10%以上で直径3mm以上の凝集物が多く見られ、塗工面の10%以上で塗工出来ていない
<被膜性評価>
ポリプロピレン製のバット(縦:25cm×横:14cm×高さ:4cm)に固形分濃度として5質量%にイオン交換水にて希釈した水性塗工液用組成物または無機フィラー含有水性塗工液用組成物30gを平滑な状態に引き延ばし、エアオーブンにて50℃の温度で24時間乾燥する。
評価は、以下の基準にて行った。
○:均一な状態のフィルム
△:一部に穴や欠けが見られるフィルム
×:フィルム化出来ず破片となる、または平滑で均一なフィルムが得られない
<黄色度>
共重合体濃度が5.0質量%となるよう、イオン交換水にて希釈し、共重合体水溶液100gを容量150mlの密栓付きガラス瓶に入れ、密栓しエアオーブンにて98℃、72時間曝露した。
[実施例1]
4つ口1Lセパラブルフラスコに窒素ガス挿入管、撹拌機、温度計を装着し、セパラブルフラスコにイオン交換水800gを仕込んだ。次いでそこにN-ビニルアセトアミド(昭和電工株式会社製)10gおよび、アクリル酸ナトリウム(昭和電工株式会社製)90gをイオン交換水(2日間窒素ガス脱気処理済み)90gに溶解した水溶液を投入した。溶解液中への窒素ガス脱気処理を行いながら撹拌加温し、内温が68℃となるよう温浴にて昇温し、2時間経過した後に重合開始剤2,2’-アゾビス[N-(カルボキシエチル)-2-メチルプロピオンアミジン]テトラハイドレート(以下、VA-057)を1.0g(総単量体比1.0質量部)を窒素ガス脱気処理したイオン交換水9gに溶解した水溶液をシリンジにて添加した。内温を68℃、スリーワンモーター(登録商標)(新東科学株式会社製 ハイパワー汎用撹拌機BLh600)にアンカー翼を取り付け、75rpmにて4時間撹拌しながら重合させ、更に内温を75℃まで上げ1時間経過したところで、N-ビニルアセトアミドおよびアクリル酸ナトリウム単量体濃度の和が1000質量ppm以下であることを確認し、氷冷し反応を終了させ、水性塗工液用組成物を得た。
[実施例2]
4つ口1Lセパラブルフラスコに窒素ガス挿入管、撹拌機、溶媒滴下装置、温度計を装着しセパラブルフラスコにイオン交換水(2日間窒素ガス脱気処理済み)500gを仕込み、溶解液中への窒素ガス脱気処理を行いながらスリーワンモーター(新東科学株式会社製 ハイパワー汎用撹拌機BLh600)にアンカー翼を取り付け、75rpmにて撹拌し、温浴にて内温68℃に加熱、2時間後に重合開始剤VA-057を0.5g(総単量体比0.5質量%)を窒素ガス脱気処理したイオン交換水9.5gに溶解しシリンジにて添加した。5分後、N-ビニルアセトアミド単量体(昭和電工株式会社製)50gと、アクリル酸ナトリウム単量体(昭和電工株式会社製)50gを窒素ガス脱気処理したイオン交換水50gに溶解した水溶液と、窒素ガス脱気処理したイオン交換水340gを混合した水溶液を、ポンプにて2時間かけ滴下投入した。滴下終了後68℃を2時間保持し、更に内温を75℃まで上げ1時間保持したところで、N-ビニルアセトアミドおよびアクリル酸ナトリウム単量体濃度の和が1,000質量ppm以下であることを確認し、氷冷し反応を終了させ、水性塗工液用組成物を得た。
[実施例3~5、比較例1、3、4、7、8]
表1記載の試薬、仕込み量、反応時間、反応温度とした以外は、実施例1と同様に行った。
[実施例6]
200mlセパラブルフラスコに実施例1にて製造した水性塗工液用組成物10g、比較例1にて製造した水性塗工液用組成物90gを入れ、20℃でスリーワンモーター(新東科学株式会社製 ハイパワー汎用撹拌機BLh600)にアンカー翼を取り付け、150rpmにて60分間混合した。
[実施例7、8]
表2記載の仕込み量とした以外は、実施例6と同様に行った。
[比較例2]
表1記載の試薬、仕込み量とした以外は、実施例2と同様に行った。
[比較例5]
N-ビニルアセトアミド90gおよびアクリル酸ナトリウム28.5質量%水溶液35.1gを窒素ガス挿入管、温度計のついた4つ口1Lのセパラブルフラスコに仕込みイオン交換水255gを投入した。次いでその状態にて溶解液中で窒素ガス脱気処理をしながら10℃まで水浴にて氷冷した。窒素ガス置換を開始してから2時間経過した時点で、重合開始剤のVA-057を0.2質量%溶解したイオン交換水を20g投入し、水浴から取り出し保温材で囲い断熱した。
セパラブルフラスコから重合した寒天状のゲルを取り出し、裁断、乾燥、粉砕して粉体共重合体を得た。得られた粉体共重合体について残留単量体濃度を確認した。粉体共重合体の固形分濃度は、99.5質量%であった。粉体共重合体をイオン交換水に溶解させ、固形分濃度が5.0質量%の水性塗工液用組成物を得た。
[比較例6]
N-ビニルアセトアミド10gおよびアクリル酸ナトリウム28.5質量%水溶液315.8gを窒素ガス挿入管、温度計のついた4つ口1Lのセパラブルフラスコに仕込みイオン交換水9.0gを投入した。次いでその状態にて溶解液中で窒素ガス置換を行いながら30℃に内温を保持した。窒素置換を開始してから2時間以上を経過した時点で重合開始剤のVA-057を0.2g、ペルオキソ二硫酸アンモニウムを0.05g、イオン交換水を9.75g投入し重合を開始し、保温材で囲い断熱した。重合開始から4時間経過し重合ピーク温度が80℃であることを確認した後、室温まで冷却しセパラブルフラスコから重合した寒天状のゲルを取り出し、裁断、乾燥、粉砕して粉体共重合体を得た。得られた粉体共重合体について残留単量体濃度を確認した。粉体共重合体の固形分濃度は、99.4質量%であった。粉体共重合体をイオン交換水に溶解させ、固形分濃度が5.0質量%の水性塗工液用組成物を得た。
VA-044:2,2’アゾビス[2-(2-イミダゾリン-2-イル)プロパン]二塩酸塩、富士フィルム和光純薬株式会社製
比較例5と比較例6の静置重合品に関しては分子量が高く、当該静置重合品を含む水性塗工液用組成物は、塗工性も乾燥性も劣る。
また比較例7、8に示すように、N-ビニルカルボン酸アミド単量体と前記不飽和カルボン酸の塩の単量体のモル比が7.0:93.0~93.0:7.0以外で重合した共重合体を含む水性塗工液用組成物では、実施例1~5に比べて蒸発時間が長い。
Claims (12)
- N-ビニルカルボン酸アミド単量体と不飽和カルボン酸の塩の単量体との共重合体と水を少なくとも含み、前記N-ビニルカルボン酸アミド単量体と前記不飽和カルボン酸の塩の単量体のモル比が7.0:93.0~93.0:7.0であり、前記共重合体の重量平均分子量が15,000~2,500,000である、水性塗工液用組成物。
- 前記共重合体のMw/Mnが1.8以上であることを特徴とする、請求項1に記載の水性塗工液用組成物。
- 更に無機フィラーを含む、請求項1または請求項2に記載の水性塗工液用組成物。
- 前記N-ビニルカルボン酸アミド単量体がN-ビニルアセトアミドである請求項1~3のいずれかに記載の水性塗工液用組成物。
- 前記共重合体の固形分濃度5質量%水溶液の粘度が1,500~30,000mPa・sであり、固形分濃度が1~15質量%である、請求項1~4のいずれかに記載の水性塗工液用組成物。
- 前記不飽和カルボン酸の塩の単量体が(メタ)アクリル酸の塩である、請求項1~5のいずれかに記載の水性塗工液用組成物。
- 前記水100質量部に対し前記共重合体を1.0~20.0質量部含む、請求項1~6のいずれかに記載の水性塗工液用組成物。
- 前記無機フィラーが、アルミナまたはベーマイトのうち少なくとも一つである、請求項3~7のいずれかに記載の水性塗工液用組成物。
- 前記水性塗工液用組成物が、N-ビニルカルボン酸アミド単量体と不飽和カルボン酸の塩の単量体との共重合体に加え、更にN-ビニルカルボン酸アミド単独重合体を含む、請求項1~8のいずれかに記載の水性塗工液用組成物。
- 基材表面に、請求項1~9のいずれかに記載の水性塗工液用組成物を塗布し、乾燥する、水溶性高分子塗工物の製造方法。
- ノンハロゲンアゾ化合物系重合開始剤を使用してラジカル重合を行う、請求項1~9のいずれかに記載の水性塗工液用組成物の製造方法。
- 撹拌重合にて重合を行う、請求項1~9のいずれかに記載の水性塗工液用組成物の製造方法。
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JPS505137B1 (ja) | 1968-05-13 | 1975-02-28 | ||
JPH0797317A (ja) * | 1993-09-29 | 1995-04-11 | Showa Denko Kk | 被膜形成型外用剤 |
JP2000302817A (ja) * | 1999-04-21 | 2000-10-31 | Kurita Water Ind Ltd | 水溶性アミジン系ポリマー水系分散液及びその製造方法 |
WO2001053427A1 (fr) * | 2000-01-17 | 2001-07-26 | Nihon Parkerizing Co., Ltd. | Agent de traitement conferant des qualites hydrophiles et une resistance a la corrosion, et fluide et procede d'hydrophilisation |
JP2002241747A (ja) | 2001-02-15 | 2002-08-28 | Kobayashi Pharmaceut Co Ltd | 冷却用組成物 |
WO2015046126A1 (ja) * | 2013-09-26 | 2015-04-02 | 日立マクセル株式会社 | 非水電池用多孔質層、非水電池用セパレータ、非水電池用電極および非水電池 |
WO2016181993A1 (ja) | 2015-05-11 | 2016-11-17 | 昭和電工株式会社 | 共重合体、二次電池の電極用バインダー、二次電池の電極用組成物、二次電池用電極 |
JP2018523764A (ja) * | 2015-08-06 | 2018-08-23 | ビーエーエスエフ ソシエタス・ヨーロピアBasf Se | 紙の製造方法 |
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CN1206365A (zh) * | 1996-10-24 | 1999-01-27 | 株式会社日本触媒 | 吸水性树脂的制造方法 |
JP5005137B2 (ja) * | 2001-07-12 | 2012-08-22 | 昭和電工株式会社 | 亜鉛二次電池用セパレータ及びそれを用いた亜鉛二次電池 |
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2020
- 2020-05-18 EP EP20809284.1A patent/EP3974457A4/en active Pending
- 2020-05-18 US US17/612,006 patent/US20220228018A1/en active Pending
- 2020-05-18 CN CN202080036370.4A patent/CN113874408B/zh active Active
- 2020-05-18 WO PCT/JP2020/019577 patent/WO2020235515A1/ja unknown
- 2020-05-18 KR KR1020217039200A patent/KR20220003597A/ko not_active Application Discontinuation
- 2020-05-18 JP JP2021520778A patent/JP7517333B2/ja active Active
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Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS505137B1 (ja) | 1968-05-13 | 1975-02-28 | ||
JPH0797317A (ja) * | 1993-09-29 | 1995-04-11 | Showa Denko Kk | 被膜形成型外用剤 |
JP2000302817A (ja) * | 1999-04-21 | 2000-10-31 | Kurita Water Ind Ltd | 水溶性アミジン系ポリマー水系分散液及びその製造方法 |
WO2001053427A1 (fr) * | 2000-01-17 | 2001-07-26 | Nihon Parkerizing Co., Ltd. | Agent de traitement conferant des qualites hydrophiles et une resistance a la corrosion, et fluide et procede d'hydrophilisation |
JP2002241747A (ja) | 2001-02-15 | 2002-08-28 | Kobayashi Pharmaceut Co Ltd | 冷却用組成物 |
WO2015046126A1 (ja) * | 2013-09-26 | 2015-04-02 | 日立マクセル株式会社 | 非水電池用多孔質層、非水電池用セパレータ、非水電池用電極および非水電池 |
WO2016181993A1 (ja) | 2015-05-11 | 2016-11-17 | 昭和電工株式会社 | 共重合体、二次電池の電極用バインダー、二次電池の電極用組成物、二次電池用電極 |
JP2018523764A (ja) * | 2015-08-06 | 2018-08-23 | ビーエーエスエフ ソシエタス・ヨーロピアBasf Se | 紙の製造方法 |
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JPWO2020235515A1 (ja) | 2020-11-26 |
TWI751558B (zh) | 2022-01-01 |
CN113874408B (zh) | 2023-09-15 |
KR20220003597A (ko) | 2022-01-10 |
CN113874408A (zh) | 2021-12-31 |
EP3974457A1 (en) | 2022-03-30 |
US20220228018A1 (en) | 2022-07-21 |
JP7517333B2 (ja) | 2024-07-17 |
TW202111029A (zh) | 2021-03-16 |
EP3974457A4 (en) | 2023-06-07 |
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