WO2017221943A1 - 変性共役ジエン系重合体の製造方法、変性共役ジエン系重合体、重合体組成物、架橋体、タイヤ及び化合物 - Google Patents
変性共役ジエン系重合体の製造方法、変性共役ジエン系重合体、重合体組成物、架橋体、タイヤ及び化合物 Download PDFInfo
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- WO2017221943A1 WO2017221943A1 PCT/JP2017/022748 JP2017022748W WO2017221943A1 WO 2017221943 A1 WO2017221943 A1 WO 2017221943A1 JP 2017022748 W JP2017022748 W JP 2017022748W WO 2017221943 A1 WO2017221943 A1 WO 2017221943A1
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- Prior art keywords
- conjugated diene
- group
- diene polymer
- compound
- modified conjugated
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Classifications
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- B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
- B60C1/0016—Compositions of the tread
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
- B60C1/0025—Compositions of the sidewalls
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F7/00—Compounds containing elements of Groups 4 or 14 of the Periodic Table
- C07F7/02—Silicon compounds
- C07F7/08—Compounds having one or more C—Si linkages
- C07F7/18—Compounds having one or more C—Si linkages as well as one or more C—O—Si linkages
- C07F7/1804—Compounds having Si-O-C linkages
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08C—TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS
- C08C19/00—Chemical modification of rubber
- C08C19/04—Oxidation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08C—TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS
- C08C19/00—Chemical modification of rubber
- C08C19/20—Incorporating sulfur atoms into the molecule
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08C—TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS
- C08C19/00—Chemical modification of rubber
- C08C19/22—Incorporating nitrogen atoms into the molecule
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08C—TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS
- C08C19/00—Chemical modification of rubber
- C08C19/25—Incorporating silicon atoms into the molecule
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08C—TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS
- C08C19/00—Chemical modification of rubber
- C08C19/30—Addition of a reagent which reacts with a hetero atom or a group containing hetero atoms of the macromolecule
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08C—TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS
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- C08C19/30—Addition of a reagent which reacts with a hetero atom or a group containing hetero atoms of the macromolecule
- C08C19/42—Addition of a reagent which reacts with a hetero atom or a group containing hetero atoms of the macromolecule reacting with metals or metal-containing groups
- C08C19/44—Addition of a reagent which reacts with a hetero atom or a group containing hetero atoms of the macromolecule reacting with metals or metal-containing groups of polymers containing metal atoms exclusively at one or both ends of the skeleton
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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
- C08F2/00—Processes of polymerisation
- C08F2/44—Polymerisation in the presence of compounding ingredients, e.g. plasticisers, dyestuffs, fillers
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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
- C08F236/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds
- C08F236/02—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds
- C08F236/04—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated
- C08F236/10—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated with vinyl-aromatic monomers
-
- 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
- C08F236/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds
- C08F236/02—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds
- C08F236/04—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated
- C08F236/12—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated with nitriles
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- C08F36/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds
- C08F36/02—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds
- C08F36/04—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated
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- C08F4/00—Polymerisation catalysts
- C08F4/42—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors
- C08F4/44—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides
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- C08F4/00—Polymerisation catalysts
- C08F4/42—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors
- C08F4/44—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides
- C08F4/50—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides selected from alkaline earth metals, zinc, cadmium, mercury, copper or silver
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- C08F8/30—Introducing nitrogen atoms or nitrogen-containing groups
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- C08F8/42—Introducing metal atoms or metal-containing groups
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- C08K3/34—Silicon-containing compounds
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- C08L19/006—Rubber characterised by functional groups, e.g. telechelic diene polymers
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- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction
Definitions
- the present disclosure relates to a method for producing a modified conjugated diene polymer, a modified conjugated diene polymer, a polymer composition, a crosslinked product, a tire, and a compound.
- a conjugated diene polymer obtained by polymerization using a conjugated diene compound has good properties such as heat resistance, wear resistance, mechanical strength, and moldability, so that a pneumatic tire, a vibration-proof rubber, Widely used in various industrial products such as hoses.
- Rubber compositions used for pneumatic tire treads, sidewalls, etc. are rubber compositions containing reinforcing agents such as carbon black and silica together with conjugated diene polymers in order to improve the durability and wear resistance of the product. It is known to blend into. Conventionally, in order to increase the affinity between a conjugated diene polymer and a reinforcing agent, a modified conjugated diene polymer obtained by modifying a conjugated diene polymer with a compound containing silicon or nitrogen has been used. (For example, refer to Patent Documents 1 and 2).
- Patent Document 1 a metal halide compound is reacted with a modified conjugated diene polymer having a weight average molecular weight of 150,000 to 2,000,000 to which an alkoxysilyl group and an optionally protected primary amino group are bonded.
- a method for producing a modified conjugated diene polymer for obtaining a rubber composition having good Mooney viscosity and shape stability in a raw rubber state and good processability by pseudo-crosslinking is disclosed. .
- Patent Document 2 discloses that a conjugated diene monomer is polymerized or copolymerized in a hydrocarbon solvent using an organolithium compound as an initiator, and then the polymerization active terminal is defined as N- (1,3- By reacting with a compound having a methyleneamino group and an alkoxysilyl group, such as dimethylbutylidene) -3-triethoxysilyl-1-propanamine, the polymer has a good interaction with both carbon black and silica. Is disclosed.
- One object of the present invention is to provide a method for producing a modified conjugated diene polymer that can be obtained by the method described above, and a modified conjugated diene polymer obtained by using the production method.
- the present disclosure provides the following modified conjugated diene polymer production method, modified conjugated diene polymer, polymer composition, crosslinked product, and tire.
- a modified conjugated diene polymer which is a reaction product with a compound [M] having at least one of at least any one of the above.
- a polymer composition comprising the modified conjugated diene polymer obtained by the production method of [1] or the modified conjugated diene polymer of [2], silica, and a crosslinking agent.
- a crosslinked rubber having excellent silica dispersibility and excellent low heat build-up it is possible to obtain a crosslinked rubber having excellent silica dispersibility and excellent low heat build-up.
- the modified conjugated diene polymer can be produced by a method including the following polymerization step and modification step.
- a monomer containing a conjugated diene compound is polymerized to obtain a conjugated diene polymer having an active end.
- the conjugated diene compound used for the polymerization include 1,3-butadiene, isoprene, 2,3-dimethyl-1,3-butadiene, 1,3-pentadiene, 1,3-hexadiene, 1,3-heptadiene, -Phenyl-1,3-butadiene, 3-methyl-1,3-pentadiene, 2-chloro-1,3-butadiene and the like.
- 1,3-butadiene, isoprene, and 2,3-dimethyl-1,3-butadiene are preferable.
- the conjugated diene polymer may be a homopolymer of a conjugated diene compound, but is preferably a copolymer of a conjugated diene compound and an aromatic vinyl compound from the viewpoint of increasing rubber strength.
- the aromatic vinyl compound used in the polymerization include styrene, 2-methylstyrene, 3-methylstyrene, 4-methylstyrene, ⁇ -methylstyrene, 2,4-dimethylstyrene, 2,4-diisopropylstyrene, 4- t-butylstyrene, 5-t-butyl-2-methylstyrene, vinylethylbenzene, divinylbenzene, trivinylbenzene, divinylnaphthalene, t-butoxystyrene, vinylbenzyldimethylamine, (4-vinylbenzyl) dimethylaminoethyl ether, N, N-dimethylaminoeth
- the conjugated diene polymer is a copolymer of a conjugated diene compound and an aromatic vinyl compound
- the living property in anionic polymerization is high, and in particular, a monomer composition containing 1,3-butadiene and styrene in the monomer composition. It is preferably a coalescence.
- the copolymer has a random copolymer portion in which the distribution of the conjugated diene compound and the aromatic vinyl compound is irregular.
- the copolymer may further have a block portion made of a conjugated diene compound or an aromatic vinyl compound.
- the proportion of the aromatic vinyl compound used is determined by the low hysteresis loss characteristics and wet skid resistance of the resulting crosslinked polymer. From the viewpoint of improving the balance, the content is preferably 3 to 55% by mass, more preferably 5 to 50% by mass, based on the total amount of the conjugated diene compound and the aromatic vinyl compound used for the polymerization.
- the content ratio of the structural unit derived from the aromatic vinyl compound in the polymer is a value measured by 1 H-NMR.
- a conjugated diene compound and an aromatic vinyl compound may be used individually by 1 type, respectively, and may be used in combination of 2 or more type.
- a compound other than the conjugated diene compound and the aromatic vinyl compound may be used as the monomer.
- other monomers include acrylonitrile, methyl (meth) acrylate, ethyl (meth) acrylate, and the like.
- the proportion of other monomers used is preferably 10% by mass or less, and more preferably 5% by mass or less, based on the total amount of monomers used for polymerization.
- any of solution polymerization method, gas phase polymerization method and bulk polymerization method may be used, but the solution polymerization method is particularly preferable.
- a polymerization form you may use any of a batch type and a continuous type.
- the solution polymerization method as an example of a specific polymerization method, a monomer containing a conjugated diene compound is polymerized in an organic solvent in the presence of a polymerization initiator and a randomizer used as necessary. The method of doing is mentioned.
- an alkali metal compound and an alkaline earth metal compound is used as the polymerization initiator.
- an alkali metal compound and an alkaline earth metal compound include, for example, methyllithium, ethyllithium, n-propyllithium, n-butyllithium, sec-butyllithium, alkyllithium such as t-butyllithium, 1,4-dilithiobutane, phenyllithium, stilbenelithium, Naphthyl lithium, 1,3-bis (1-lithio-1,3-dimethylpentyl) benzene, 1,3-phenylenebis (3-methyl-1-phenylpentylidene) dilithium, naphthyl sodium, naphthyl potassium, di-n -Butylmagnesium, di-n-hexylmagnesium, ethoxypotassium, calcium stearate and the like. Of these, lithium compounds are preferred.
- the polymerization reaction may be performed using a mixture of at least one of an alkali metal compound and an alkaline earth metal compound and a compound having a functional group that interacts with silica as an initiator.
- the polymerization initiation terminal of the conjugated diene polymer can be modified with a functional group that interacts with silica.
- the “functional group that interacts with silica” means a group having an element that interacts with silica, such as nitrogen, sulfur, phosphorus, and oxygen.
- Interaction refers to an intermolecular force that forms a covalent bond between molecules or is weaker than a covalent bond (eg, ion-dipole interaction, dipole-dipole interaction, hydrogen bond, van der Waals This means that an electromagnetic force between molecules such as force is formed.
- a nitrogen-containing compound such as a secondary amine compound
- the nitrogen-containing compound include, for example, dimethylamine, diethylamine, dipropylamine, dibutylamine, dodecamethyleneimine, N, N′-dimethyl-N′-trimethylsilyl-1,6-diaminohexane, piperidine, pyrrolidine, Hexamethyleneimine, heptamethyleneimine, dicyclohexylamine, N-methylbenzylamine, di- (2-ethylhexyl) amine, diallylamine, morpholine, N- (trimethylsilyl) piperazine, N- (tert-butyldimethylsilyl) piperazine, 1, Examples include 3-ditrimethylsilyl-1,3,5-triazinane.
- At least one of an alkali metal compound and an alkaline earth metal compound and a compound having a functional group that interacts with silica are mixed in advance, and the mixture is polymerized.
- Polymerization may be carried out by adding it.
- at least one of an alkali metal compound and an alkaline earth metal compound and a compound having a functional group that interacts with silica may be added to the polymerization system, and polymerization may be performed by mixing both in the polymerization system. Good. Any of these cases is included in an embodiment in which “a monomer containing a conjugated diene compound is polymerized in the presence of an initiator containing at least one of an alkali metal compound and an alkaline earth metal compound”.
- the randomizer can be used for the purpose of adjusting the vinyl bond content representing the vinyl bond content in the polymer.
- randomizers include dimethoxybenzene, tetrahydrofuran, dimethoxyethane, diethylene glycol dibutyl ether, diethylene glycol dimethyl ether, 2,2-di (tetrahydrofuryl) propane, 2- (2-ethoxyethoxy) -2-methylpropane, triethylamine, pyridine N-methylmorpholine, tetramethylethylenediamine and the like. These can be used individually by 1 type or in combination of 2 or more types.
- the organic solvent used for the polymerization may be an organic solvent inert to the reaction, and for example, aliphatic hydrocarbons, alicyclic hydrocarbons, aromatic hydrocarbons and the like can be used.
- hydrocarbons having 3 to 8 carbon atoms are preferable, and specific examples thereof include, for example, propane, n-butane, isobutane, n-pentane, isopentane, n-hexane, cyclohexane, propene, 1-butene and isobutene.
- the monomer concentration in the reaction solvent is preferably 5 to 50% by mass, and preferably 10 to 30% by mass from the viewpoint of maintaining a balance between productivity and ease of polymerization control. More preferred.
- the temperature of the polymerization reaction is preferably ⁇ 20 ° C. to 150 ° C., more preferably 0 to 120 ° C.
- the polymerization reaction is preferably performed under a pressure sufficient to keep the monomer in a substantially liquid phase. Such a pressure can be obtained by a method such as pressurizing the inside of the reactor with a gas inert to the polymerization reaction.
- the weight average molecular weight (Mw) in terms of polystyrene by gel permeation chromatography (GPC) of the conjugated diene polymer obtained is preferably 5.0 ⁇ 10 4 to 1.0 ⁇ 10 6 . If Mw is smaller than 5.0 ⁇ 10 4 , the tensile strength, low heat build-up and wear resistance of the crosslinked polymer tend to be lowered, and if larger than 1.0 ⁇ 10 6 , the modified polymer is The processability of the rubber composition obtained by use tends to decrease. More preferably, it is 8.0 ⁇ 10 4 to 8.0 ⁇ 10 5 , and still more preferably 1.0 ⁇ 10 5 to 5.0 ⁇ 10 5 .
- the vinyl bond content in the butadiene unit is preferably 30 to 70% by mass, more preferably 33 to 68% by mass, and 35 to 65% by mass. Is more preferable. If the vinyl bond content is less than 30 mol%, the grip characteristics tend to be low, and if it exceeds 70 mass%, the wear resistance of the resulting vulcanized rubber tends to decrease.
- the “vinyl bond content” is a value indicating the content ratio of structural units having 1,2-bonds to all structural units of butadiene in the conjugated diene polymer. 1 H-NMR Is a value measured by.
- the active terminal of the conjugated diene polymer obtained in the polymerization step is reacted with compound [M].
- the compound having a total of 2 or more as a denaturant By using it, a modified conjugated diene polymer modified with a group having a large number of branches of the polymer chain and interacting with silica can be obtained by the modification step.
- examples of the hydrocarbyl group of R 1 include an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, and an aryl group having 6 to 20 carbon atoms.
- Etc. A 1 is not particularly limited as long as it has an alkoxysilyl group, but is preferably a group further having a methylene group or a polymethylene group, and has a methylene group or a polymethylene group and an alkoxysilyl group.
- the number of the specific imino group possessed by the compound [M] may be two or more, and preferably 2 to 6.
- the plurality of R 1 with compound [M] is, A 1 may be the same or different.
- R 2 and R 3 are each independently a hydrocarbyl group having 1 to 20 carbon atoms
- R 4 is an alkanediyl group having 1 to 20 carbon atoms
- R 5 has an m-valent hydrocarbyl group having 1 to 20 carbon atoms, or at least one atom selected from the group consisting of a nitrogen atom, an oxygen atom and a sulfur atom.
- n is an integer of 1 to 3
- m is an integer of 2 to 10.
- a plurality of R 2 , R 3 , R 4 , A 2 and n may be the same or different.
- the hydrocarbyl group of R 2 and R 3 is, for example, an alkyl group having 1 to 20 carbon atoms, an allyl group, a cycloalkyl group having 3 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, or the like.
- Examples of the hydrocarbylene group for R 4 include an alkanediyl group having 1 to 20 carbon atoms, a cycloalkylene group having 3 to 20 carbon atoms, and an arylene group having 6 to 20 carbon atoms.
- R 4 is preferably linear.
- n is preferably 2 or 3, more preferably 3 in that the effect of improving silica dispersibility is high.
- the m-valent hydrocarbyl group represented by R 5 includes a chain hydrocarbon having 1 to 20 carbon atoms, an alicyclic hydrocarbon having 3 to 20 carbon atoms, or m hydrogen atoms from an aromatic hydrocarbon having 6 to 20 carbon atoms. And the like from which is removed.
- a group obtained by removing m hydrogen atoms from the ring portion of the aromatic hydrocarbon (aromatic ring group) is preferable in that the effect of improving the wear resistance of the obtained vulcanized rubber is high.
- aromatic hydrocarbon examples include a ring structure represented by the following formula (2) and a polycyclic structure (for example, a biphenyl group) formed by connecting two or more of the ring structures.
- r is an integer of 0 to 5.
- R 5 is an m-valent group having 1 to 20 carbon atoms having at least one atom selected from the group consisting of a nitrogen atom, an oxygen atom and a sulfur atom, and having no active hydrogen.
- examples include an m-valent heterocyclic group, an m-valent group having a tertiary amine structure, and the like.
- the heterocyclic group is preferably a conjugated system, for example, a single ring or condensed ring such as pyridine, pyrimidine, pyrazine, quinoline, naphthalidine, furan, thiophene, or a structure in which a plurality of such single rings or condensed rings are connected.
- active hydrogen refers to a hydrogen atom bonded to an atom other than a carbon atom, preferably one having a bond energy lower than the carbon-hydrogen bond of polymethylene.
- compound [M] examples include compounds represented by the following formulas (M-1) to (M-23).
- compound [M] may be used individually by 1 type, and may be used in combination of 2 or more type.
- R 7 in formula (M-11) represents a hydrogen atom or an alkyl group.
- Compound [M] can be synthesized by appropriately combining organic chemistry methods.
- a monofunctional amine compound having an alkoxysilyl group and R 4 for example, 3-aminopropyltriethoxysilane, 3-aminopropyl) methyl diethoxy silane, etc.
- polyfunctional aldehyde compounds with R 5 e.g., terephthalaldehyde, isophthalaldehyde, phthalic dialdehyde, a method of 2,4-pyridinedicarboxylate aldehydes
- R A polyfunctional amine compound having 5 for example, tris (2-aminoethyl) amine, N, N′-bis (2-aminoethyl) methylamine, etc.
- the reaction between the conjugated diene polymer having an active terminal and the compound [M] can be performed, for example, as a solution reaction.
- the use ratio of compound [M] (the total amount when two or more are used) is 0 with respect to 1 mol of metal atoms involved in the polymerization of the polymerization initiator, from the viewpoint of sufficiently allowing the modification reaction to proceed.
- the amount is preferably 0.01 mol or more, more preferably 0.05 mol or more.
- the upper limit is preferably less than 2.0 mol and less than 1.5 mol with respect to 1 mol of metal atoms involved in the polymerization of the polymerization initiator in order to avoid excessive addition. Is more preferable.
- the temperature of the modification reaction is usually the same as the polymerization reaction, preferably ⁇ 20 ° C. to 150 ° C., more preferably 0 to 120 ° C.
- the reaction time is preferably 1 minute to 5 hours, more preferably 2 minutes to 1 hour.
- the conjugated diene polymer having an active terminal and the compound [M] other modifiers or coupling agents may be used together with the compound [M].
- the other modifier or coupling agent is not particularly limited as long as it is a compound that can react with the active terminal of the conjugated diene polymer obtained by the above polymerization, and as a modifier or coupling agent for the conjugated diene polymer. Known compounds can be used. When other modifiers or coupling agents are used, the proportion used is preferably 10 mol% or less, more preferably 5 mol% or less.
- the weight average molecular weight in terms of polystyrene by GPC has a Mooney viscosity sufficiently high and a modified conjugated diene polymer having good shape stability and excellent workability. From the viewpoint of achieving compatibility with obtaining a rubber composition, it is preferably 1.5 ⁇ 10 5 to 2.0 ⁇ 10 6 . More preferably, it is 1.8 ⁇ 10 5 to 1.5 ⁇ 10 6 , and still more preferably 2.0 ⁇ 10 5 to 1.2 ⁇ 10 6 .
- the weight average molecular weight of the modified conjugated diene polymer is a value obtained from the maximum peak molecular weight of the GPC curve measured by GPC after the reaction between the conjugated diene polymer having an active terminal and the compound [M].
- the ratio AT / AL (hereinafter also referred to as “coupling ratio of three or more branches”) of the peak part area AT showing the peak top molecular weight is 40% or more.
- the coupling rate of three or more branches is more preferably 45% or more, further preferably 50% or more, and particularly preferably 55% or more.
- the peak top molecular weight of the peak with the smallest molecular weight measured by GPC after the reaction of the conjugated diene polymer having an active end with the compound [M] is preferably 5.0 ⁇ 10 4 to 1.0 ⁇ 10 6. More preferably, the range is 8.0 ⁇ 10 4 to 8.0 ⁇ 10 5 , and still more preferably 1.0 ⁇ 10 5 to 5.0 ⁇ 10 5 .
- the number of branches of the polymer chain per molecule of the resulting modified conjugated diene polymer is preferably 3 or more from the viewpoint that the Mooney viscosity of the resulting modified conjugated diene polymer is sufficiently high and the cold flow can be improved. More preferably, it is in the range of 3-20.
- the C ⁇ N group is more reactive than the alkoxysilyl group and reacts preferentially with the active terminal of the conjugated diene polymer, so that the number of residual alkoxysilyl groups increases, and the resulting modified conjugated diene polymer It is conceivable that the interaction with silica was improved, thereby showing an excellent low heat generation property.
- the modified conjugated diene polymer of the present disclosure is represented by the following formula (3).
- R 2 is a hydrocarbyl group having 1 to 20 carbon atoms
- R 6 is a hydrocarbyloxy group having 1 to 20 carbon atoms, or a modified or unmodified conjugated diene polymer chain
- R 4 is an alkanediyl group having 1 to 20 carbon atoms
- Z is a group represented by the following formula (4) or formula (5):
- R 5 is an m-valent having 1 to 20 carbon atoms.
- a plurality of R 2 , R 4 , R 6 , Z, and n may be the same or different.
- R 1 is a hydrogen atom or a hydrocarbyl group
- Poly is a modified or unmodified conjugated diene polymer chain. “*” Is a bond that binds to R 5 . Indicates that it is a hand.
- the hydrocarbyloxy group for R 6 is preferably an ethoxy group or a methoxy group.
- the conjugated diene polymer chain of R 6 and the conjugated diene polymer chain Poly in the formulas (4) and (5) correspond to the structure corresponding to the conjugated diene polymer having an active end obtained in the polymerization step. It is. These conjugated diene polymer chains may have functional groups that interact with silica at the ends.
- the polymer composition of the present disclosure contains the modified conjugated diene polymer, silica, and a crosslinking agent.
- the content ratio of the modified conjugated diene polymer in the polymer composition is preferably 10% by mass or more, more preferably 20% by mass or more, based on the total amount of the polymer composition. More preferably, it is 25 mass% or more.
- the upper limit of the modified conjugated diene polymer is preferably 50% by mass or less, more preferably 40% by mass or less.
- silica examples include wet silica (hydrous silicic acid), dry silica (anhydrous silicic acid), colloidal silica, precipitated silica, calcium silicate, and aluminum silicate.
- wet silica is particularly preferable from the viewpoint of the effect of improving fracture characteristics and the effect of achieving both wet grip properties and low rolling resistance.
- high dispersible type silica from the viewpoint of improving dispersibility in the polymer composition and improving physical properties and processability.
- a silica can be used individually by 1 type or in combination of 2 or more types.
- various reinforcing fillers such as carbon black, clay and calcium carbonate may be blended in addition to silica as a filler.
- silica alone or a combination of carbon black and silica is used.
- the total amount of silica and carbon black in the polymer composition is preferably 20 to 130 parts by mass, more preferably 25 to 110 parts by mass with respect to 100 parts by mass of the total amount of the polymer components contained in the polymer composition. Part.
- crosslinking agent examples include sulfur, sulfur halides, organic peroxides, quinonedioximes, organic polyvalent amine compounds, alkylphenol resins having a methylol group, and sulfur is usually used.
- the amount of sulfur is preferably 0.1 to 5 parts by mass, more preferably 0.5 to 3 parts by mass with respect to 100 parts by mass of the total amount of polymer components contained in the polymer composition.
- BR butadiene rubber
- SBR styrene butadiene rubber
- NR natural rubber
- IR isoprene rubber
- styrene isoprene copolymer rubber butadiene isoprene copolymer rubber and the like
- BR and SBR are more preferable.
- the content ratio of the other rubber component in the polymer composition is preferably 60% by mass or less, and 50% by mass or less with respect to the total amount of the modified conjugated diene polymer and the other rubber component. More preferably.
- a process oil generally used for oil-extended elastomer may be blended as an oil for oil-extended.
- Process oils are formulated into rubber compositions, for example, by adding oil directly during rubber compounding.
- Preferred process oils include various oils known in the art, such as aromatic oils, paraffinic oils, naphthenic oils, vegetable oils, and oils with a low content of polycyclic aromatic compounds (low PCA oil), for example, mild extract solvate (MES), oil treated with aromatic extract from distillate (TDAE), aromatic special extract from residual oil (SRAE: special ⁇ residual aromatic extract), heavy naphthenic oil and the like.
- MES mild extract solvate
- TDAE aromatic extract from distillate
- SRAE aromatic special extract from residual oil
- MES MES
- TDAE TDAE
- SRAE SRAE
- the blending amount of the process oil is preferably 10 to 100 parts by mass with respect to 100 parts by mass of the total amount of the polymer components contained in the polymer composition.
- the polymer composition includes, for example, anti-aging agent, zinc white, stearic acid, softener, sulfur, vulcanization accelerator, silane coupling agent, compatibilizer, vulcanization aid, processing
- Various additives generally used in tire rubber compositions such as an auxiliary agent and a scorch inhibitor can be blended. These blending ratios can be appropriately selected according to various components within a range not impairing the effects of the present disclosure.
- the components to be blended as necessary include an open kneader (for example, roll) and a closed kneader (for example, Banbury mixer). It can be applied to various rubber products as a cross-linked body by kneading using a kneader such as the like and cross-linking (vulcanizing) after molding.
- an open kneader for example, roll
- a closed kneader for example, Banbury mixer
- the crosslinked product is used for tires such as tire treads, under treads, carcass, sidewalls, bead portions, etc .; seal materials such as packings, gaskets, weather strips, O-rings; automobiles, ships, aircrafts, Inner and outer skin materials for various vehicles such as railways; Building materials; Anti-vibration rubbers for industrial machines and facilities; Various hoses and hose covers such as diaphragms, rolls, radiator hoses and air hoses; Belts for power transmission Belts such as; linings; dust boots; medical equipment materials; fenders; insulating materials for electric wires; and other industrial products.
- a modified conjugated diene polymer having a high Mooney viscosity, good shape stability, and good processability when used as a polymer composition is obtained.
- the physical properties required for tire applications such as low heat buildup and wear resistance can be obtained while maintaining good conditions. Therefore, the polymer composition containing the modified conjugated diene polymer obtained in the present disclosure can be suitably used particularly as a material for tire treads and sidewalls.
- the tire can be manufactured according to a conventional method.
- a tread is obtained by mixing a polymer composition with a kneader and forming a sheet into a predetermined position (for example, outside of a carcass in the case of a sidewall) and vulcanizing and molding.
- a predetermined position for example, outside of a carcass in the case of a sidewall
- a pneumatic tire is obtained.
- the peak with the smallest molecular weight is a peak derived from a polymer excluding a polymer whose molecular weight has increased due to a reaction with a modifier or a coupling agent.
- GPC measurement conditions Column: Two brand names “TSK gel HHR-H” (manufactured by Tosoh Corporation) Column temperature: 40 ° C.
- Mobile phase Tetrahydrofuran Flow rate: 1.0 ml / min Sample concentration: 10 mg / 20 ml -Weight average molecular weight of the polymer after the modification reaction: It was determined in terms of polystyrene from the retention time corresponding to the peak of the maximum peak of the GPC curve obtained above.
- -Coupling rate (%) of three or more branches About 2.5 times or more of the peak top molecular weight of the peak having the smallest molecular weight with respect to 100% of the total area derived from the polymer of the GPC curve for the GPC curve obtained above.
- the area ratio of the peak portion showing the peak top molecular weight was defined as a coupling ratio of three or more branches.
- Mooney viscosity (ML 1 + 4 , 100 ° C.) Measured according to JIS K6300 using an L rotor under conditions of preheating 1 minute, rotor operating time 4 minutes, and temperature 100 ° C.
- Cold flow was measured by extruding the polymer through a 1/4 inch orifice at a pressure of 3.5 pounds per square inch and a temperature of 50 ° C. In order to obtain a steady state, the extrusion speed was measured after standing for 10 minutes, and the value was expressed in grams (g / min) per minute. The cold flow value indicates that the smaller the value, the better the shape stability (storage stability).
- tan ⁇ Measured using a vulcanized rubber as a measurement sample and using a dynamic spectrometer (manufactured by Rheometrics, USA) under conditions of a tensile dynamic strain of 0.7%, an angular velocity of 100 radians per second, and 70 ° C. . Expressed as an index, the larger the value, the smaller the rolling resistance and the better the low heat buildup.
- DIN abrasion test Measured at 25 ° C. with a load of 10 N according to JIS K6264 using a vulcanized rubber as a measurement sample and using a DIN abrasion tester (manufactured by Toyo Seiki Co., Ltd.).
- the modifiers (compound (M-1) to compound (M-13)) used in the examples are the above-described formulas (M-1) to (M-13) exemplified above as the compound [M], respectively. Corresponding to each of the compounds.
- Example 1 Synthesis of modified conjugated diene polymer I and its physical properties Polymerization was carried out in the same manner as the modified conjugated diene polymer i except that 2.12 mmol of the compound (M-1) was added instead of N, N-bis (trimethylsilyl) aminopropylmethyldiethoxysilane.
- the modified conjugated diene polymer I was obtained by removing the solvent from the solution and isolating the polymer in the same manner as the conjugated diene polymer i.
- Various physical properties of the modified conjugated diene polymer I obtained are shown in Table 2 below.
- Example 4 Synthesis and Properties of Modified Conjugated Diene Polymer IV Polymerization was carried out in the same manner as the modified conjugated diene polymer I except that the addition amount of the polymerization initiator was 6.00 mmol and the addition amount of the modifier was 1.43 mmol, and the same as the modified conjugated diene polymer i. Then, the solvent was removed from the solution and the polymer was isolated to obtain a modified conjugated diene polymer IV. Various physical property values and the like of the resulting modified conjugated diene polymer IV are shown in Table 2 below.
- Example 5 Synthesis of modified conjugated diene polymer V and its physical properties Polymerization was carried out in the same manner as the modified conjugated diene polymer I except that the addition amount of the polymerization initiator was 3.37 mmol and the addition amount of the modifier was 1.10 mmol, and the same as the modified conjugated diene polymer i Then, the solvent was removed from the solution and the polymer was isolated, whereby a modified conjugated diene polymer V was obtained.
- the various physical property values and the like of the obtained modified conjugated diene polymer V are shown in Table 2 below.
- Examples 7 to 16 Synthesis of modified conjugated diene polymers VII to XVI and their physical properties
- the compounds (M-2) to (M-11) shown in Table 2 and Table 3 below were added instead of the compound (M-1), respectively.
- Polymerization was performed, and the solvent was removed from the solution in the same manner as in the modified conjugated diene polymer i, and the polymer was isolated to obtain modified conjugated diene polymers VII to XVI.
- Various physical property values and the like of the obtained modified conjugated diene polymers VII to XVI are shown in Tables 2 and 3 below.
- Example 16 a compound in which “R 7 ” in the above formula (M-11) is a hydrogen atom was used as a modifier.
- Example 17 Synthesis and Properties of Modified Conjugated Diene Polymer XVII Polymerization was carried out in the same manner as the modified conjugated diene polymer I except that 1.43 mmol of the compound (M-12) was added instead of the compound (M-1), and the modified conjugated diene polymer i and Similarly, the solvent was removed from the solution and the polymer was isolated to obtain a modified conjugated diene polymer XVII.
- Table 3 Various physical property values and the like of the obtained modified conjugated diene polymer XVII are shown in Table 3 below.
- Example 18 Synthesis and Properties of Modified Conjugated Diene Polymer XVIII Polymerization was carried out in the same manner as modified conjugated diene polymer I, except that 1.43 mmol of compound (M-13) was added instead of compound (M-1), and the same as modified conjugated diene polymer i. Then, the solvent was removed from the solution and the polymer was isolated to obtain a modified conjugated diene polymer XVIII.
- the various physical property values and the like of the obtained modified conjugated diene polymer XVIII are shown in Table 3 below.
- Example 19 Synthesis and Properties of Modified Conjugated Diene Polymer XIX Polymerization was carried out in the same manner as the modified conjugated diene polymer I except that 2.12 mmol of a 1: 1 (molar ratio) mixture of the compound (M-1) and the compound (M-2) was added.
- the modified conjugated diene polymer XIX was obtained by removing the solvent from the solution and isolating the polymer in the same manner as the polymer i.
- Various physical properties of the obtained modified conjugated diene polymer XIX are shown in Table 3 below.
- INI-1 reaction product of n-butyllithium and piperidine (compound represented by the above formula (INI-1)) Modification agent 1; N, N-bis (trimethylsilyl) aminopropylmethyldiethoxysilane Modification agent 2; Compound represented by the above formula (A) Modification agent 3; Tetraglycidyl-1,3-bisaminomethylcyclohexane
- Butadiene rubber, extender oil, silica, carbon black, silane coupling agent, stearic acid, anti-aging agent and zinc oxide were mixed and kneaded.
- the blend obtained above was cooled to room temperature, and then sulfur and a vulcanization accelerator were blended and kneaded. This was molded and vulcanized with a vulcanizing press at 160 ° C. for a predetermined time to obtain a crosslinked rubber (vulcanized rubber).
- the blended Mooney viscosity measurement 70 ° C.
- the modified conjugated diene polymers obtained in Examples 1 to 19 are all modified conjugated diene polymers having few branches obtained in Comparative Example 1, or unmodified conjugated diene polymers obtained in Comparative Example 5. Compared to the polymer, the Mooney viscosity was high and the cold flow was low. Therefore, the modified conjugated diene polymer obtained in Examples 1 to 19 is more shaped than the modified conjugated diene polymer obtained in Comparative Example 1 and the conjugated diene polymer obtained in Comparative Example 5. It was found to be excellent in stability (storage stability). The Mooney viscosity and cold flow value of the modified conjugated diene polymers obtained in Examples 1 to 19 were substantially the same as the results of Comparative Examples 2, 3, and 4.
- the processability and rolling resistance of the compounded rubbers obtained in Examples 1 to 19 and the tire physical properties (rolling resistance and wear resistance) of the vulcanized rubber are substantially the same as those of Comparative Example 1. Although the degree of wear resistance, the Examples were superior in wear resistance. Further, compared with Comparative Examples 2 to 4, although the wear resistance was substantially the same, the workability and rolling resistance were superior to those of the Examples. Moreover, compared with Comparative Example 5, the working example, rolling resistance, and wear resistance were superior in Example.
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Abstract
Description
[2] 活性末端を有する共役ジエン系重合体と、基「-CR1=N-A1」及び基「-N=CR1-A1」(ただし、R1は水素原子又はヒドロカルビル基であり、A1はアルコキシシリル基を有する1価の基である。)の少なくともいずれかを合計2個以上有する化合物[M]との反応生成物である、変性共役ジエン系重合体。
[3]上記[1]の製造方法により得られる変性共役ジエン系重合体又は上記[2]の変性共役ジエン系重合体と、シリカと、架橋剤とを含む重合体組成物。
[4]上記[3]の重合体組成物を架橋させてなる架橋体。
[5]上記[3]の重合体組成物を用いて、少なくともトレッド又はサイドウォールが形成されたタイヤ。
[6]下記式(1)で表される化合物。
本工程は、共役ジエン化合物を含むモノマーを重合して、活性末端を有する共役ジエン系重合体を得る工程である。重合に使用する共役ジエン化合物としては、例えば1,3-ブタジエン、イソプレン、2,3-ジメチル-1,3-ブタジエン、1,3-ペンタジエン、1,3-ヘキサジエン、1,3-ヘプタジエン、2-フェニル-1,3-ブタジエン、3-メチル-1,3-ペンタジエン、2-クロロ-1,3-ブタジエン等が挙げられる。これらの中でも、1,3-ブタジエン、イソプレン、2,3-ジメチル-1,3-ブタジエンが好ましい。
本工程では、上記重合工程で得られた共役ジエン系重合体が有する活性末端と、化合物[M]とを反応させる。基「-CR1=N-A1」及び基「-N=CR1-A1」の少なくともいずれか(以下、「特定イミノ基」ともいう。)を合計2個以上有する化合物を変性剤として用いることで、当該変性工程によって重合体鎖の分岐数が多く、かつシリカと相互作用する基で変性された変性共役ジエン系重合体を得ることができる。
R5のm価のヒドロカルビル基としては、炭素数1~20の鎖状炭化水素、炭素数3~20の脂環式炭化水素又は炭素数6~20の芳香族炭化水素からm個の水素原子を取り除いた基等が挙げられる。得られる加硫ゴムの耐摩耗性の改善効果が高い点で、好ましくは、芳香族炭化水素の環部分からm個の水素原子を取り除いた基(芳香族環基)である。当該芳香族炭化水素の具体例としては、例えば下記式(2)で表される環構造、当該環構造が2個以上連結してなる多環構造(例えばビフェニル基等)が挙げられる。
mは2~10の整数である。mは、ゴム組成物の加工性の観点から、2~6が好ましい。なお、本明細書において「活性水素」とは、炭素原子以外の原子に結合した水素原子をいい、好ましくはポリメチレンの炭素-水素結合よりも結合エネルギが低いものを指す。
活性末端を有する共役ジエン系重合体と化合物[M]との反応後にGPCにより測定される、分子量が最も小さいピークのピークトップ分子量は、好ましくは5.0×104~1.0×106の範囲であり、より好ましくは8.0×104~8.0×105の範囲であり、さらに好ましくは1.0×105~5.0×105の範囲である。
本開示の重合体組成物は、上記の変性共役ジエン系重合体、シリカ及び架橋剤を含有する。重合体組成物中における上記変性共役ジエン系重合体の含有割合は、重合体組成物の全体量に対して、10質量%以上であることが好ましく、20質量%以上であることがより好ましく、25質量%以上であることがさらに好ましい。上記変性共役ジエン系重合体の上限値は、好ましくは50質量%以下、より好ましくは40質量%以下である。
・ビニル含量(%):400MHzの1H-NMRによって測定した。
・結合スチレン含量(%):400MHzの1H-NMR測定によって測定した。
・変性反応前の重合体の重量平均分子量(変性反応前ピーク分子量):変性剤又はカップリング剤による変性反応後において、以下の測定条件で、ゲルパーミエーションクロマトグラフィー(GPC)(Viscotek TDA302(商品名(Viscotek社製)))を使用して得られたGPC曲線につき、分子量が最も小さいピークの頂点に相当する保持時間からポリスチレン換算で求めた。なお、分子量が最も小さいピークは、変性剤又はカップリング剤との反応によって分子量が増加した重合体を除いた重合体に由来するピークである。
(GPC測定条件)
カラム:商品名「TSK gel HHR-H」(東ソー社製)2本
カラム温度:40℃
移動相:テトラヒドロフラン
流速:1.0ml/分
サンプル濃度:10mg/20ml
・変性反応後の重合体の重量平均分子量:上記で得られたGPC曲線の最大ピークの頂点に相当する保持時間からポリスチレン換算で求めた。
・ムーニー粘度(ML1+4,100℃):JIS K6300に準拠し、Lローターを使用して、予熱1分、ローター作動時間4分、温度100℃の条件で求めた。
・コールドフロー(C/F):圧力3.5ポンド/平方インチ、温度50℃で重合体を1/4インチオリフィスに通して押し出すことによりコールドフローを測定した。定常状態にするために、10分間放置後、押し出し速度を測定し、値を毎分のグラム数(g/min)で示した。なお、コールドフロー値は、その値が小さいほど、形状安定性(貯蔵安定性)が良好であることを示す。
・配合ムーニー粘度:加硫前の配合ゴムを測定用試料とし、JIS K6300に準拠し、Lローターを使用して、予熱1分、ローター作動時間4分、温度100℃の条件で測定した。指数で表示し、数値が大きいほど加工性が良好である。
[加硫ゴムの特性評価]
・70℃tanδ:加硫ゴムを測定用試料とし、動的スペクトロメーター(米国レオメトリックス社製)を使用して、引張動歪0.7%、角速度100ラジアン毎秒、70℃の条件で測定した。指数で表示し、数値が大きいほど転がり抵抗性が小さく、低発熱性が良好である。
・DIN摩耗試験:加硫ゴムを測定用試料とし、DIN摩耗試験機(東洋精機社製)を使用して、JIS K6264に準拠し、荷重10Nで25℃にて測定した。指数で表示し、数値が大きいほど耐摩耗性が良好である。
なお、実施例で使用した変性剤(化合物(M-1)~化合物(M-13))はそれぞれ、化合物[M]として上記で例示した上記式(M-1)~式(M-13)のそれぞれで表される化合物に対応する。
[実施例1A 化合物(M-1)の合成]
100mLのナスフラスコに、トルエン溶媒80mL、テレフタルアルデヒド4.55g(33.92mmol)、3-アミノプロピルトリエトキシシラン15.02g(67.84mmol)を仕込み、ディーン・スターク装置を用いて120℃で還流を行った。水が出切ってから更に2時間還流を続けた後、フィルター濾過し、トルエン溶媒を減圧留去した。生成物の純度を1H-NMRスペクトル分析とGC/MS分析により見積もった上で、変性共役ジエン系重合体の変性剤としてそのまま使用した。
1H-NMR(溶媒:CDCl3)化学シフトδ:8.26ppm(N=CH-Ph、2H)、7.73ppm(ベンゼン環上水素、4H)、3.80ppm(CH3-CH 2-O-、12H)、3.61ppm(Si-CH2-CH2-CH 2-N、4H)、1.83ppm(Si-CH2-CH 2-CH2-N、4H)、1.20ppm(CH 3-CH2-O、18H)、0.67ppm(Si-CH 2-CH2-CH2-N、4H)
化合物[M]の合成に使用する化合物の種類及び仕込み量を下記表1に示す通りにした以外は実施例1Aと同じ操作を行い、化合物(M-2)~(M-13)をそれぞれ合成した。化合物(M-2)、化合物(M-8)、化合物(M-9)及び化合物(M-10)の1H-NMRピークは以下の通りであった。
・化合物(M-2)
1H-NMR(溶媒:CDCl3)化学シフトδ:8.67ppm(N=CH-Ph、2H)、8.10ppm(ベンゼン環上水素、4H)、3.83ppm(CH3-CH 2-O-、8H)、3.71ppm(Si-CH2-CH2-CH 2-N、4H)、1.70ppm(Si-CH2-CH 2-CH2-N、4H)、1.21ppm(CH 3-CH2-O、12H)、1.02ppm(Si-CH 2-CH2-CH2-N、4H)、0.14ppm(CH 3-Si、6H)
・化合物(M-8)
1H-NMR(溶媒:CDCl3)化学シフトδ:8.89~7.94ppm(ピリジン環上水素、3H)、8.28~7.50ppm(N=CH-Ph、2H)、3.83ppm(CH3-CH 2-O-、12H)、1.49ppm(Si-CH2-CH2-CH 2-N、4H)、1.40ppm(Si-CH2-CH 2-CH2-N、4H)、1.21ppm(CH 3-CH2-O、18H)、0.58ppm(Si-CH 2-CH2-CH2-N、4H)
・化合物(M-9)
1H-NMR(溶媒:CDCl3)化学シフトδ:7.50ppm(N=CH-Fr、2H)、6.54ppm(フラン環上水素、2H)、3.83ppm(CH3-CH 2-O、8H)、1.49ppm(Si-CH2-CH2-CH 2-N、4H)、1.40ppm(Si-CH2-CH 2-CH2-N、4H)、1.21ppm(CH 3-CH2-O、12H)、0.58ppm(Si-CH 2-CH2-CH2-N、4H)
・化合物(M-10)
1H-NMR(溶媒:CDCl3)化学シフトδ:7.73~7.35ppm(チオフェン環上水素、4H)、7.50ppm(N=CH-Th、2H)、3.83ppm(CH3-CH 2-O、8H)、1.49ppm(Si-CH2-CH2-CH 2-N、4H)、1.40ppm(Si-CH2-CH 2-CH2-N、4H)、1.21ppm(CH 3-CH2-O、12H)、0.58ppm(Si-CH 2-CH2-CH2-N、4H)
[比較例1 変性共役ジエン系重合体iの合成及びその物性]
窒素置換された内容積5リットルのオートクレーブ反応器に、シクロヘキサン2,000g、テトラヒドロフラン31.6g、スチレン122g及び1,3-ブタジエン320gを仕込んだ。反応器の内容物の温度を10℃に調整した後、重合開始剤としてn-ブチルリチウム4.75mmolを添加して重合を開始した。重合は断熱条件で実施し、最高温度は85℃に達した。重合転化率が99%に達した時点で(重合開始から20分経過後に)、1,3-ブタジエン10gを2分間かけて追加し、その後、N,N-ビス(トリメチルシリル)アミノプロピルメチルジエトキシシラン4.08mmolを加えて15分間反応を行った。
得られた変性共役ジエン系重合体を含む重合体溶液に、2,6-ジ-tert-ブチル-p-クレゾールを3.96g添加した。次いで、スチームストリッピングにより脱溶媒を行い、110℃に調温された熱ロールで乾燥することにより変性共役ジエン系重合体iを得た。得られた変性共役ジエン系重合体iの各種物性値等を下記表3に示す。
N,N-ビス(トリメチルシリル)アミノプロピルメチルジエトキシシランの代わりに、下記式(A)で表されるオルガノシランを添加したこと以外は、変性共役ジエン系重合体iと同様にして重合を行い、変性共役ジエン系重合体iと同様にして溶液から溶媒を除去して重合体を単離することにより、変性共役ジエン系重合体iiを得た。得られた変性共役ジエン系重合体iiの各種物性値等を下記表3に示す。
N,N-ビス(トリメチルシリル)アミノプロピルメチルジエトキシシランの代わりに、テトラグリシジル-1,3-ビスアミノメチルシクロヘキサン2.12mmolを添加したこと以外は、変性共役ジエン系重合体iと同様にして重合を行い、変性共役ジエン系重合体iと同様にして溶液から溶媒を除去して重合体を単離することにより、変性共役ジエン系重合体iiiを得た。得られた変性共役ジエン系重合体iiiの各種物性値等を下記表3に示す。
[比較例4 変性共役ジエン系重合体ivの合成及びその物性]
N,N-ビス(トリメチルシリル)アミノプロピルメチルジエトキシシランの代わりに、四塩化ケイ素2.12mmolを添加したこと以外は、変性共役ジエン系重合体iと同様にして重合を行い、変性共役ジエン系重合体iと同様にして溶液から溶媒を除去して重合体を単離することにより、変性共役ジエン系重合体ivを得た。得られた変性共役ジエン系重合体ivの各種物性値等を下記表3に示す。
[比較例5 共役ジエン系重合体vの合成及びその物性]
N,N-ビス(トリメチルシリル)アミノプロピルメチルジエトキシシランの代わりに、過剰量のメタノールを添加したこと以外は、変性共役ジエン系重合体iと同様にして重合を行い、変性共役ジエン系重合体iと同様にして溶液から溶媒を除去して重合体を単離することにより、未変性の共役ジエン系重合体vを得た。得られた共役ジエン系重合体vの各種物性値等を表3に示す。
N,N-ビス(トリメチルシリル)アミノプロピルメチルジエトキシシランの代わりに、化合物(M-1)2.12mmolを添加したこと以外は、変性共役ジエン系重合体iと同様にして重合を行い、変性共役ジエン系重合体iと同様にして溶液から溶媒を除去して重合体を単離することにより、変性共役ジエン系重合体Iを得た。得られた変性共役ジエン系重合体Iの各種物性値等を下記表2に示す。
変性剤の添加量を、それぞれ1.43mmol、1.10mmolとしたこと以外は、変性共役ジエン系重合体Iと同様にして重合を行い、変性共役ジエン系重合体iと同様にして溶液から溶媒を除去して重合体を単離することにより、変性共役ジエン系重合体II、IIIを得た。得られた変性共役ジエン系重合体II、IIIの各種物性値等を下記表2に示す。
[実施例4 変性共役ジエン系重合体IVの合成及びその物性]
重合開始剤の添加量を6.00mmol、変性剤の添加量を1.43mmolとしたこと以外は、変性共役ジエン系重合体Iと同様にして重合を行い、変性共役ジエン系重合体iと同様にして溶液から溶媒を除去して重合体を単離することにより、変性共役ジエン系重合体IVを得た。得られた変性共役ジエン系重合体IVの各種物性値等を下記表2に示す。
重合開始剤の添加量を3.37mmol、変性剤の添加量を1.10mmolとしたこと以外は、変性共役ジエン系重合体Iと同様にして重合を行い、変性共役ジエン系重合体iと同様にして溶液から溶媒を除去して重合体を単離することにより、変性共役ジエン系重合体Vを得た。得られた変性共役ジエン系重合体Vの各種物性値等を下記表2に示す。
[実施例6 変性共役ジエン系重合体VIの合成及びその物性]
窒素置換された内容積5リットルのオートクレーブ反応器に、ピペリジンを、使用する重合開始剤(下記式(INI-1)で表される化合物)の量が4.75mmolとなるようにさらに仕込んだこと以外は、変性共役ジエン系重合体Iと同様にして重合を行い、変性共役ジエン系重合体iと同様にして溶液から溶媒を除去して重合体を単離することにより、変性共役ジエン系重合体VIを得た。得られた変性共役ジエン系重合体VIの各種物性値等を下記表2に示す。
化合物(M-1)の代わりに、下記表2及び表3に記載の化合物(M-2)~化合物(M-11)をそれぞれ添加したこと以外は、変性共役ジエン系重合体Iと同様にして重合を行い、変性共役ジエン系重合体iと同様にして溶液から溶媒を除去して重合体を単離することにより、変性共役ジエン系重合体VII~XVIを得た。得られた変性共役ジエン系重合体VII~XVIの各種物性値等を下記表2及び表3に示す。実施例16では、変性剤として上記式(M-11)中の「R7」が水素原子である化合物を用いた。
[実施例17 変性共役ジエン系重合体XVIIの合成及びその物性]
化合物(M-1)の代わりに、化合物(M-12)を1.43mmolを添加したこと以外は、変性共役ジエン系重合体Iと同様にして重合を行い、変性共役ジエン系重合体iと同様にして溶液から溶媒を除去して重合体を単離することにより、変性共役ジエン系重合体XVIIを得た。得られた変性共役ジエン系重合体XVIIの各種物性値等を下記表3に示す。
化合物(M-1)の代わりに、化合物(M-13)を1.43mmol添加したこと以外は、変性共役ジエン系重合体Iと同様にして重合を行い、変性共役ジエン系重合体iと同様にして溶液から溶媒を除去して重合体を単離することにより、変性共役ジエン系重合体XVIIIを得た。得られた変性共役ジエン系重合体XVIIIの各種物性値等を下記表3に示す。
[実施例19 変性共役ジエン系重合体XIXの合成及びその物性]
化合物(M-1)と化合物(M-2)の1:1(モル比)混合物2.12mmolを添加したこと以外は、変性共役ジエン系重合体Iと同様にして重合を行い、変性共役ジエン系重合体iと同様にして溶液から溶媒を除去して重合体を単離することにより、変性共役ジエン系重合体XIXを得た。得られた変性共役ジエン系重合体XIXの各種物性値等を下記表3に示す。
INI-1;n-ブチルリチウムとピペリジンとの反応生成物(上記式(INI-1)で表される化合物)
変性剤1;N,N-ビス(トリメチルシリル)アミノプロピルメチルジエトキシシラン
変性剤2;上記式(A)で表される化合物
変性剤3;テトラグリシジル-1,3-ビスアミノメチルシクロヘキサン
上記で製造した変性共役ジエン系重合体(比較例5は未変性)を用いて、下記表4に示す配合処方により各成分を配合し、これを混練りすることによって配合ゴムを製造した。混練りは以下の方法で行った。温度制御装置を付属したプラストミル(内容量:250ml)を使用し、まず一段目の混練りとして、充填率72%、回転数60rpmの条件で、変性共役ジエン系重合体(比較例5は未変性)、ブタジエンゴム、伸展油、シリカ、カーボンブラック、シランカップリング剤、ステアリン酸、老化防止剤及び酸化亜鉛を配合して混練りした。次いで、二段目の混練りとして、上記で得た配合物を室温まで冷却後、硫黄及び加硫促進剤を配合し混練りした。これを成型し、160℃で所定時間、加硫プレスにて加硫して、架橋ゴム(加硫ゴム)を得た。
得られた配合ゴム及び加硫ゴムを用いて、配合ムーニー粘度測定、70℃tanδ測定及びDIN摩耗試験を行うことにより、加工性、転がり抵抗性(低発熱性)及び耐摩耗性を評価した。評価結果を下記表5に示す。なお、配合ムーニー粘度、70℃tanδ及びDIN摩耗試験の測定結果は、比較例5を100とする指数でそれぞれ示した。
*1:JSR社製 BR01、*2:ジャパンエナジー社製 JOMOプロセスNC-140、*3:ローディア社製 ZEOSIL 1165MP、*4:三菱化学社製 ダイアブラックN339、*5:エボニック社製 Si75、*6:精工化学社製 オゾノン6C、*7:大内新興化学工業社製 ノクセラーD、*8:大内新興化学工業社製 ノクセラーCZ。
Claims (12)
- アルカリ金属化合物及びアルカリ土類金属化合物の少なくとも一方を含む開始剤の存在下、共役ジエン化合物を含むモノマーを重合して得られる、活性末端を有する共役ジエン系重合体と、基「-C(R1)=N-A1」及び基「-N=C(R1)-A1」(ただし、R1は水素原子又はヒドロカルビル基であり、A1はアルコキシシリル基を有する1価の基である。)の少なくともいずれかを合計2個以上有する化合物[M]と、を反応させる、変性共役ジエン系重合体の製造方法。
- 前記化合物[M]は、下記式(1)で表される化合物である、請求項1に記載の変性共役ジエン系重合体の製造方法。
- 前記活性末端を有する共役ジエン系重合体と前記化合物[M]との反応後にゲルパーミエーションクロマトグラフィー(GPC)により測定して得られるGPC曲線につき、分子量が最も小さいピークのピークトップ分子量の2.5倍以上のピークトップ分子量を示すピーク部分の面積が、前記GPC曲線のピーク面積全体に対して40%以上である、請求項1又は2に記載の変性共役ジエン系重合体の製造方法。
- 前記活性末端を有する共役ジエン系重合体と前記化合物[M]との反応後にゲルパーミエーションクロマトグラフィー(GPC)により測定される、分子量が最も小さいピークのピークトップ分子量が5.0×104~1.0×106の範囲である、請求項1~3のいずれか一項に記載の変性共役ジエン系重合体の製造方法。
- 前記モノマーが芳香族ビニル化合物を更に含む、請求項1~4のいずれか一項に記載の変性共役ジエン系重合体の製造方法。
- 前記開始剤として、アルカリ金属化合物及びアルカリ土類金属化合物の少なくともいずれかと、シリカと相互作用する官能基を有する化合物との混合物を用いて前記モノマーを重合する、請求項1~5のいずれか一項に記載の変性共役ジエン系重合体の製造方法。
- 活性末端を有する共役ジエン系重合体と、基「-CR1=N-A1」及び基「-N=CR1-A1」(ただし、R1は水素原子又はヒドロカルビル基であり、A1はアルコキシシリル基を有する1価の基である。)の少なくともいずれかを合計2個以上有する化合物[M]と、の反応生成物である、変性共役ジエン系重合体。
- 下記式(3)で表される変性共役ジエン系重合体。
- 請求項1~6のいずれか一項に記載の製造方法により得られる変性共役ジエン系重合体、又は請求項7若しくは8に記載の変性共役ジエン系重合体と、シリカと、架橋剤とを含む重合体組成物。
- 請求項9に記載の重合体組成物を架橋させてなる架橋体。
- 請求項9に記載の重合体組成物を用いて、少なくともトレッド又はサイドウォールが形成されたタイヤ。
- 下記式(1)で表される化合物。
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Also Published As
Publication number | Publication date |
---|---|
PL3476866T3 (pl) | 2022-03-28 |
BR112018076588A2 (pt) | 2019-04-16 |
JP6252716B1 (ja) | 2017-12-27 |
CN108473599A (zh) | 2018-08-31 |
SG11201811355XA (en) | 2019-01-30 |
HUE057974T2 (hu) | 2022-06-28 |
US20190194430A1 (en) | 2019-06-27 |
JPWO2017221943A1 (ja) | 2018-07-05 |
TWI636997B (zh) | 2018-10-01 |
EP3476866A1 (en) | 2019-05-01 |
EP3476866B1 (en) | 2022-01-05 |
RU2709338C1 (ru) | 2019-12-17 |
TW201809025A (zh) | 2018-03-16 |
KR20180087380A (ko) | 2018-08-01 |
US10894876B2 (en) | 2021-01-19 |
KR102018618B1 (ko) | 2019-09-05 |
EP3476866A4 (en) | 2020-02-26 |
CN108473599B (zh) | 2020-09-15 |
BR112018076588A8 (pt) | 2023-01-17 |
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