WO2022080450A1 - ゴムベール及びその製造方法、重合体組成物、架橋体及びタイヤ - Google Patents
ゴムベール及びその製造方法、重合体組成物、架橋体及びタイヤ Download PDFInfo
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- WO2022080450A1 WO2022080450A1 PCT/JP2021/038055 JP2021038055W WO2022080450A1 WO 2022080450 A1 WO2022080450 A1 WO 2022080450A1 JP 2021038055 W JP2021038055 W JP 2021038055W WO 2022080450 A1 WO2022080450 A1 WO 2022080450A1
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- polymer
- conjugated diene
- rubber
- surfactant
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- KJIIRNRRFVPFJZ-UHFFFAOYSA-N trimethyl(piperazin-1-yl)silane Chemical compound C[Si](C)(C)N1CCNCC1 KJIIRNRRFVPFJZ-UHFFFAOYSA-N 0.000 description 1
- BFAJFQDFDYFZOO-UHFFFAOYSA-N trimethyl-(3-trimethylsilyl-1,3,5-triazinan-1-yl)silane Chemical compound C[Si](C)(C)N1CNCN([Si](C)(C)C)C1 BFAJFQDFDYFZOO-UHFFFAOYSA-N 0.000 description 1
- 125000000026 trimethylsilyl group Chemical group [H]C([H])([H])[Si]([*])(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 239000003981 vehicle Substances 0.000 description 1
- ABDKAPXRBAPSQN-UHFFFAOYSA-N veratrole Chemical compound COC1=CC=CC=C1OC ABDKAPXRBAPSQN-UHFFFAOYSA-N 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Classifications
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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
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
- C08L9/06—Copolymers with styrene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L15/00—Compositions of rubber derivatives
-
- 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
-
- 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
- B60C1/0016—Compositions of the tread
-
- 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
-
- 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
- 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
-
- 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
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
-
- 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
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
-
- 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
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/10—Esters; Ether-esters
- C08K5/101—Esters; Ether-esters of monocarboxylic acids
- C08K5/103—Esters; Ether-esters of monocarboxylic acids with polyalcohols
-
- 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
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/17—Amines; Quaternary ammonium compounds
-
- 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
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/20—Carboxylic acid amides
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2312/00—Crosslinking
- C08L2312/02—Crosslinking with dienes
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- 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 rubber bale and a method for producing the same, a polymer composition, a crosslinked body, and a tire.
- the conjugated diene-based polymer obtained by polymerization using a conjugated diene compound has good properties such as heat resistance, wear resistance, mechanical strength, and molding processability. Widely used in various industrial products such as hoses.
- the polymer composition used for manufacturing treads, sidewalls, etc. of pneumatic tires is reinforced with carbon black, silica, etc. together with a conjugated diene-based polymer in order to improve the durability and wear resistance of the product. It is known that the agent is compounded.
- conjugated diene-based polymer there are various modified conjugated diene-based polymers in which a functional group that interacts with silica is introduced into the terminal or main chain of the conjugated diene-based polymer chain in order to obtain a tire having excellent fuel efficiency. Proposed. Compared to unmodified conjugated diene-based polymers, modified conjugated diene-based polymers are more compatible with reinforcing fillers such as carbon black and silica, so heat generation is suppressed and fuel efficiency is improved in tire applications. It is possible to make it.
- Patent Document 1 discloses that a dispersant such as bis- (2-hydroxyethylisotridecyloxypropylamine) is blended with a modified conjugated diene-based polymer
- Patent Document 2 discloses modified or modified. It is disclosed that the dispersibility of silica is improved by producing a rubber veil by adding a nonionic surfactant such as di (polyoxyethylene) stearylamine to an unmodified conjugated diene-based polymer.
- the present disclosure has been made in view of the above problems, and its main purpose is to provide a rubber veil capable of obtaining a crosslinked body having excellent processability and scorch resistance and excellent fuel efficiency.
- the present inventor has diligently studied to solve the above-mentioned problems of the prior art. As a result, it has been found that the above-mentioned problems can be solved by adding a specific additive to the modified conjugated diene-based polymer to obtain a rubber veil. Specifically, the present disclosure provides the following means.
- a rubber veil containing a modified conjugated diene-based polymer and a surfactant having an HLB of 9.0 or less [1] A rubber veil containing a modified conjugated diene-based polymer and a surfactant having an HLB of 9.0 or less. [2] A mixing step of mixing a polymer solution in which a modified conjugated diene polymer is dissolved in a solvent and a surfactant having an HLB of 9.0 or less, and a solvent from the solution obtained by the mixing step. A method for producing a rubber veil, which comprises a desolvation step of removing. [3] A polymer composition obtained by blending the rubber veil of the above [1] with at least one reinforcing filler selected from the group consisting of silica, carbon black and an inorganic compound represented by the following formula (4). thing.
- M 1 is a hydration of a specific metal which is any of aluminum, magnesium, titanium and calcium, an oxide of the specific metal, a hydroxide of the specific metal, and an oxide of the specific metal. It is at least one selected from the group consisting of a substance and a hydrate of the hydroxide of the specific metal.
- N is an integer of 1 to 5
- m is an integer of 0 to 10
- k is 2 to 2. It is an integer of 5
- i is an integer of 0 to 10.
- the rubber veil of the present disclosure is, for example, a rectangular parallelepiped mass obtained by compression molding synthetic rubber, which is a material for rubber products. Various additives are mixed with this rubber veil, kneaded, and further subjected to processes such as molding and vulcanization to finally produce a rubber product.
- the rubber veil of the present disclosure contains a modified conjugated diene-based polymer and a surfactant having an HLB of 9.0 or less.
- the rubber bale of the present disclosure is preferably manufactured by a method including the following steps.
- Polymerization step A step of polymerizing a monomer containing a conjugated diene compound in the presence of a polymerization initiator to obtain a conjugated diene-based polymer having an active terminal.
- Modification step A step of reacting the active terminal of the conjugated diene polymer obtained by the above polymerization with a compound having a hydrocarbyloxysilyl group and a nitrogen-containing group (hereinafter, also referred to as "terminal modifier").
- Mixing step A step of mixing a polymer solution in which a modified conjugated diene-based polymer is dissolved in a solvent and a surfactant.
- Desolvent step A step of removing the solvent from the solution containing the modified conjugated diene polymer and the surfactant.
- conjugated diene compound examples include 1,3-butadiene, isoprene, 2,3-dimethyl-1,3-butadiene, 1,3-pentadiene, 1,3-hexadiene, 1,3-heptadiene, and 2, -Phenyl-1,3-butadiene, 3-methyl-1,3-pentadiene, 2-chloro-1,3-butadiene and the like can be mentioned.
- 1,3-butadiene, isoprene, and 2,3-dimethyl-1,3-butadiene are preferable, and 1,3-butadiene is highly effective in improving workability and reducing hysteresis loss in a well-balanced manner. Is particularly preferable.
- the conjugated diene compound may be used alone or in combination of two or more.
- the conjugated diene-based polymer may be a homopolymer using a conjugated diene compound, but from the viewpoint of increasing the strength of rubber, a structural unit derived from the conjugated diene compound and a structural unit derived from the aromatic vinyl compound are used. It is preferable that it is a copolymer having.
- the aromatic vinyl compound include styrene, 2-methylstyrene, 3-methylstyrene, 4-methylstyrene, ⁇ -methylstyrene, 2,4-dimethylstyrene, 2,4-diisopropylstyrene, and 4-t-butylstyrene.
- the conjugated diene polymer produced in this step is a copolymer of a conjugated diene compound and an aromatic vinyl compound
- the conjugated diene polymer has high living property in anionic polymerization, and is 1,3-. It is preferably a copolymer having a structural unit derived from butadiene and a structural unit derived from styrene.
- This copolymer is preferably a random copolymer of a conjugated diene compound and an aromatic vinyl compound.
- the random copolymer may further have a block portion made of a conjugated diene compound or another aromatic vinyl compound.
- the ratio of aromatic vinyl compounds used is the total amount of monomers used for polymerization from the viewpoint of improving the balance between the low hysteresis loss characteristics (low fuel consumption performance) of the obtained crosslinked product and the wet skid resistance and the wear resistance. On the other hand, it is preferably 3 to 55% by mass, and more preferably 5 to 50% by mass.
- 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 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 ratio of the other monomers used is preferably 5% by mass or less, more preferably 3% by mass or less, based on the total amount of the monomers used for the polymerization.
- the solution polymerization method is particularly preferable.
- the polymerization type either a batch type or a continuous type may be used.
- an example of a specific polymerization method is a method of polymerizing a monomer in an organic solvent in the presence of a polymerization initiator and, if necessary, a randomizer.
- Examples of the polymerization initiator include alkali metal compounds and alkaline earth metal compounds. Specific examples of these include alkyllithium, 1,4-dilithiobutane, phenyllithium, stillbenlithium, naphthyllithium, 1,3-bis (1-lithio-1,3-dimethylpentyl) benzene, and 1,3-phenylene. Examples thereof include bis (3-methyl-1-phenylpentylidene) dilithium, sodium naphthyl, potassium naphthyl, di-n-butylmagnesium, di-n-hexylmagnesium, ethoxypotassium, calcium stearate and the like.
- the alkyllithium examples include methyllithium, ethyllithium, n-propyllithium, n-butyllithium, sec-butyllithium, t-butyllithium and the like.
- the alkali metal compound and the alkaline earth metal compound are preferably lithium compounds.
- the ratio of the alkali metal compound and the alkaline earth metal compound may be 0.2 to 20 mmol with respect to 100 g of the monomer used for the polymerization. preferable.
- a metal obtained by mixing an alkali metal compound or an alkaline earth metal compound as a polymerization initiator and a compound having a functional group that interacts with silica hereinafter, also referred to as “initiator modifier”.
- An amide compound may be used.
- a functional group derived from the initiation modifier can be introduced into the polymerization initiation terminal of the conjugated diene-based polymer.
- the "functional group that interacts with silica” in the present specification means a group having an element that interacts with silica such as nitrogen, sulfur, phosphorus, and oxygen.
- An “interaction” is 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). It means forming an electromagnetic force (electromagnetic force acting between molecules such as force).
- the starting modifier is preferably a nitrogen-containing compound such as a secondary amine compound.
- nitrogen-containing compound include, for example, dimethylamine, diethylamine, dipropylamine, dibutylamine, dodecamethyleneimine, N, N'-dimethyl-N'-trimethylsilyl-1,6-diaminohexane, di- (2-).
- Chain amines such as ethylhexyl) amines and diallylamines; piperidine, pyrrolidine, hexamethyleneimine, heptamethyleneimine, dicyclohexylamine, N-methylbenzylamine, morpholine, N- (trimethylsilyl) piperazine, N- (tert-butyldimethylsilyl) Cyclic amines such as piperidine, 1,3-ditrimethylsilyl-1,3,5-triazinan and the like can be mentioned.
- the alkali metal compound or the alkaline earth metal compound and the starting modifier are used. May be mixed in advance, and the mixture may be added to the polymerization system to carry out the polymerization.
- the alkali metal compound or alkaline earth metal compound and the initiation modifier may be added to the polymerization system separately or simultaneously, and both may be mixed and polymerized in the polymerization system.
- the amount of the starting modifier used is appropriately set according to the type of the alkali metal compound or the alkaline earth metal compound.
- the amount of the starting modifier used is used for the above-mentioned polymerization from the viewpoint of achieving a good balance between the processability of the polymer composition and the low fuel consumption performance of the crosslinked product. It is preferably in the range of 0.1 to 1.8 mol, more preferably in the range of 0.2 to 1.0 mol, with respect to 1 mol of the total amount of metallic lithium.
- the initiation modifier one type may be used alone or two or more types may be used in combination.
- the randomizer (hereinafter, also referred to as "vinyl group content adjusting agent”) is used for the purpose of adjusting the vinyl group content, which represents the content of vinyl bonds in the polymer.
- Examples of 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.
- the randomizer one type can be used alone or two or more types can be used in combination.
- the organic solvent used for the polymerization may be any organic solvent that is 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 propane, n-butane, isobutane, n-pentane, isopentane, n-hexane, cyclohexane, propene, and 1-butene.
- the organic solvent one of these can be used alone or in combination of two or more.
- the monomer concentration in the reaction solvent is preferably 5 to 50% by mass, 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 carried out under a pressure sufficient to keep the monomer substantially in the liquid phase.
- Such pressure can be obtained by a method such as pressurizing the inside of the reactor with a gas that is inert to the polymerization reaction.
- the 1,2-vinyl group content (hereinafter, also referred to as “vinyl group content”) of the conjugated diene polymer having an active terminal is preferably 20 to 70% by mass, and preferably 30 to 68% by mass. It is more preferably 33 to 65% by mass, and even more preferably 33 to 65% by mass. If the vinyl group content is less than 20% by mass, the wet grip characteristics tend to be low, and if it exceeds 70% by mass, the fuel efficiency performance tends to be low.
- the "vinyl group content” is a value indicating the content ratio of the structural unit having a 1,2-bond to the total structural unit of butadiene in the conjugated diene polymer, and is obtained by 1 H-NMR. It is a measured value.
- the alkali metal active end or the alkaline earth metal active end of the conjugated diene polymer obtained by the above polymerization step is reacted with the terminal modifier.
- a conjugated diene-based polymer having an active terminal with a terminal modifier, a polymer having a nitrogen-containing group at the end of the main chain can be obtained.
- the "active terminal” means a portion (more specifically, a metal terminal) other than the structure derived from the monomer having a carbon-carbon double bond, which is present at the end of the molecular chain.
- the terminal modifier may have at least one hydrocarbyloxysilyl group and one nitrogen-containing group in each molecule.
- the "hydrocarbyloxysilyl group” is a group in which at least one hydrocarbyloxy group is bonded to a silicon atom, and refers to a group represented by the following formula (5).
- R 20 and R 21 are independently hydrocarbyl groups. I is an integer of 1 to 3. When i is 1, a plurality of R 21s in the formula are the same or different. . When i is 2 or 3, multiple R20s in the equation are the same or different. "*" Indicates that they are joiners.)
- the terminal modifier is a compound represented by the following formula (6), a compound represented by the following formula (7), a compound represented by the following formula (8), and a compound represented by the following formula (9). It is preferably at least one selected from the group consisting of the represented compounds.
- a 2 is a monovalent functional group having a nitrogen atom, no active hydrogen, and bonded to R 17 with a nitrogen atom.
- R 15 and R 16 are hydrocarbyls.
- Group, R 17 is a hydrocarbylene group, r is an integer of 0 to 2. When r is 0 or 1, multiple R 16s in the equation are the same or different, and when r is 2.
- A3 has at least one atom selected from the group consisting of nitrogen, phosphorus, oxygen, sulfur and silicon, has no active hydrogen, and has a nitrogen atom with respect to R22 . It is a monovalent functional group bonded with a phosphorus atom, an oxygen atom, a sulfur atom or a silicon atom, or a hydrocarbyl group having 1 to 20 carbon atoms.
- R 22 is a single bond or a hydrocarbylene group, and R 23 .
- R 24 are independently hydrocarbyl groups, R 25 is a hydrocarbylene group, and t is 0 or 1.
- R 31 is an alkanediyl group having 1 to 20 carbon atoms
- R 32 and R 33 are independently hydrocarbyl groups having 1 to 20 carbon atoms
- a 1 is a group.
- “* -C (R 35 ) N-" or group
- “* -N C (R 35 )-” (where R 35 is a hydrogen atom or hydrocarbyl group and "*" is a bond that binds to R 34 . It indicates that it is a hand.).
- R 34 has an m-valent hydrocarbon group having 1 to 20 carbon atoms, or at least one atom selected from the group consisting of nitrogen, oxygen and sulfur. It is a m-valent group having 1 to 20 carbon atoms and does not have active hydrogen. N is an integer of 1 to 3 and m is an integer of 2 to 10. R 31 to R 33 and A 1 respectively. When a plurality of identical symbols exist in an expression, the groups represented by the symbols are the same or different from each other.
- R 42 , R 43 and R 45 are each independently an alkanediyl group having 1 to 12 carbon atoms, and are R 40 , R 41 , R 46 , R 47 , R 48 and R 49 , respectively.
- R 40 , R 41 , R 46 , R 47 , R 48 and R 49 are independently hydrocarbyl groups having 1 to 20 carbon atoms.
- A, c and d are independently integers of 1 to 3
- b is an integer of 1 to 10.
- the groups represented by the symbols are the same or different from each other.
- the hydrocarbyl group represented by R 15 , R 16 , R 23 , and R 24 is a linear or branched alkyl group having 1 to 20 carbon atoms and 3 carbon atoms. It is preferably a cycloalkyl group of about 20 or an aryl group having 6 to 20 carbon atoms.
- R 17 , R 22 and R 25 a linear or branched alkanediyl group having 1 to 20 carbon atoms, a cycloalkylene group having 3 to 20 carbon atoms or an arylene group having 6 to 20 carbon atoms is preferable.
- a 2 is a nitrogen-containing group and may have a chain structure or a cyclic structure.
- the nitrogen atom of A 2 may not be bound to active hydrogen and may be protected by a protecting group (for example, a trisubstituted hydrocarbylsilyl group).
- a 2 may be a group that can become an onium ion by an onium salt producing agent.
- a 2 for example, a nitrogen-containing group in which two hydrogen atoms of a primary amino group are substituted by two protective groups, and one hydrogen atom of a secondary amino group is substituted by one protective group.
- examples thereof include a nitrogen-containing group, a tertiary amino group, an imino group, and a pyridyl group.
- a 2 is a group in which one hydrogen atom of a tertiary amino group or a secondary amino group is substituted with one protecting group and two hydrogen atoms of a primary amino group are substituted with two protecting groups. It is preferable to have at least one of the following groups.
- the "protecting group” is a functional group that converts A2 into a functional group that is inactive with respect to the polymerization active terminal.
- the nitrogen-containing group and the tertiary amino group in which one hydrogen atom of the secondary amino group is replaced by one protecting group may be chain-like or cyclic.
- At least one atom selected from the group consisting of nitrogen, phosphorus, oxygen, sulfur and silicon possessed by A3 is not bonded to active hydrogen and has a protecting group (for example, a trisubstituted hydrocarbylsilyl group). May be protected by.
- a 3 may be a group that can become an onium ion by an onium salt producing agent.
- A3 for example, a nitrogen-containing group in which two hydrogen atoms of a primary amino group are substituted with two protective groups, and one hydrogen atom of a secondary amino group is substituted with one protective group.
- a phosphorus-containing group consisting of two hydrogen atoms of a nitrogen-containing group, a tertiary amino group, an imino group, a pyridyl group, and a primary phosphino group substituted with two protective groups, and one hydrogen atom of a secondary phosphino group is one.
- the group etc. can be mentioned.
- A3 is preferably a group having silicon or nitrogen, and more preferably a hydrocarbyloxysilyl group, a nitrogen-containing group having a protecting group, or a tertiary amino group.
- examples of the hydrocarbylene group of R 31 include an alkanediyl group having 1 to 12 carbon atoms, a cycloalkylene group having 3 to 12 carbon atoms, and an arylene group having 6 to 12 carbon atoms.
- examples of the hydrocarbyl group of R 32 and R 33 include an alkyl group having 1 to 20 carbon atoms, an allyl group, a cycloalkyl group having 3 to 20 carbon atoms, and an aryl group having 6 to 20 carbon atoms.
- the m-valent hydrocarbon group of R 34 is a group obtained by removing m hydrogen atoms from the hydrocarbon.
- the m- valent hydrocarbon group of R34 is preferably a group obtained by removing m hydrogen atoms from the ring portion of the aromatic hydrocarbon (m-valent aromatic ring group).
- the aromatic hydrocarbon include a monocyclic or condensed ring such as a benzene ring, a naphthalene ring, and an anthracene ring, and a structure in which two or more of these rings are bonded by a single bond.
- R 34 is a m-valent group having at least one atom selected from the group consisting of nitrogen, oxygen and sulfur and having no active hydrogen and having a carbon number of 1 to 20.
- examples thereof include an m-valent heterocyclic group and an m-valent group having a tertiary amine structure.
- the heterocyclic group is preferably a conjugated system, for example, a monocyclic or condensed ring such as pyridine, pyrimidine, pyrazine, quinoline, naphthalidine, furan, thiophene, or a ring having a structure in which a plurality of rings are linked. Examples thereof include a group obtained by removing m hydrogen atoms from the portion.
- m is preferably 2 to 6 from the viewpoint of improving the processability of the polymer composition.
- n is preferably 2 or 3 and more preferably 3 in that the effect of improving silica dispersibility can be further enhanced.
- the alkanediyl groups of R 45 , R 42 and R 43 are preferably linear.
- the hydrocarbyl group of R 40 , R 41 , R 46 to R 49 include an alkyl group having 1 to 20 carbon atoms, an allyl group, a cycloalkyl group having 3 to 20 carbon atoms, and an aryl group having 6 to 20 carbon atoms. Be done. 2 or 3 is preferable, and 3 is more preferable, because a, c and d can further enhance the effect of improving silica dispersibility.
- b is preferably 1 to 5, more preferably 1 to 3.
- terminal modifier examples include N, N-bis (trimethylsilyl) aminopropyltrimethoxysilane and N, N-bis (trimethylsilyl) aminopropylmethyldiethoxysilane as compounds represented by the above formula (6).
- Examples of the compound represented by the above formula (7) include 1-trimethylsilyl-2,2-dimethoxy-1-aza-2-silacyclopentane and 1-triethylsilyl-2,2-diethoxy-1-aza-2.
- -Silacyclopentane, 2,2-dimethoxy-1- (3-trimethoxysilylpropyl) -1,2-azacilolidine, 2,2-dimethoxy-1-phenyl-1,2-azasilolidine, 2- (2,2) -Dimethoxy-1,2-azasilolidin-1-yl) -N, N-diethylethane-1-amine and the like can be mentioned.
- Examples of the compound represented by the above formula (8) include the following formulas (m-1-1) to (m-1-8). Examples thereof include a compound represented by each of the above, and a compound in which the alkyl group and the alkanediyl group in the compound are replaced with an alkyl group having 1 to 6 carbon atoms and an alkanediyl group having 1 to 6 carbon atoms, respectively.
- Examples of the compound represented by the above formula (9) include tris (2-triethoxysilylethyl) amine, tris (3-triethoxysilylpropyl) amine, tris (5-triethoxysilylpentyl) amine, N, N.
- the reaction between the polymerization active terminal and the terminal modifier is preferably performed as a solution reaction.
- This solution reaction may be carried out using a solution containing an unreacted monomer after the completion of the polymerization reaction, and the conjugated diene polymer contained in the solution is isolated and dissolved in an appropriate solvent such as cyclohexane. You may. Further, the above reaction may be carried out by either a batch type or a continuous type.
- the method of adding the terminal modifier is not particularly limited, and examples thereof include a method of adding all at once, a method of adding separately, and a method of continuously adding.
- the amount of the terminal modifier used in the above reaction may be appropriately set according to the type of the compound used in the reaction, but is preferably 0.1 with respect to the metal atoms involved in the polymerization reaction of the polymerization initiator.
- the molar equivalent or more more preferably 0.3 molar equivalent or more.
- the amount of the terminal denaturing agent used in the above reaction is preferably 1.5 molar equivalents or less, more preferably 1 with respect to the metal atoms involved in the polymerization reaction of the polymerization initiator in order to avoid the addition of an excessive amount of the terminal modifier. .2 mol or less.
- the temperature of the above reaction is usually the same as the temperature of the polymerization reaction, preferably ⁇ 20 ° C. to 150 ° C., and more preferably 0 to 120 ° C. If the reaction temperature is too low, the viscosity of the modified conjugated diene polymer tends to increase. On the other hand, if the reaction temperature is too high, the polymerization active end is likely to be deactivated.
- the reaction time is preferably 1 minute to 5 hours, more preferably 2 minutes to 1 hour.
- a treatment may be performed in which the polymerization active end and the coupling agent are reacted for the purpose of enhancing the Mooney viscosity and cold flow characteristics of the polymer.
- the reaction using the coupling agent may be carried out before or after the reaction between the polymerization active end and the terminal modifier, or may be carried out at the same time as the reaction between the polymerization active end and the end modifier.
- the coupling agent examples include 2,4-tolylene diisocyanate, diphenylmethane diisocyanate, N, N, N', N'-tetramethylphthalic acid amide, tetrachlorosilicon, N, N, N', Examples thereof include N'-tetramethyl-4,4'-diaminobenzophenone and tetrachlorotin.
- the modified conjugated diene polymer having a protecting group is used as the terminal modifier, a part or all of the protecting group is substituted with hydrogen in the modified conjugated diene polymer having a protecting group derived from the terminal modifier.
- the polymer obtained in the above process may be used as a modified conjugated diene-based polymer in the subsequent steps.
- a protecting group-containing compound is used as the terminal modifier, the modified conjugated diene polymer modified with the terminal modifier may be further reacted with the onium salt-producing agent.
- a polymer having an onium salt structure at the terminal of the polymer can be obtained as a modified conjugated diene-based polymer. It is preferable that the modified conjugated diene-based polymer has an onium salt structure in that the shape retention of the crosslinked product obtained by using the polymer composition can be improved.
- the polystyrene-equivalent weight average molecular weight (Mw) of the modified conjugated diene polymer by gel permeation chromatography (GPC) is preferably 1.0 ⁇ 105 or more. When Mw is smaller than 1.0 ⁇ 105, the shape stability, tensile strength and wear resistance of the crosslinked body tend to decrease.
- the Mw of the modified conjugated diene polymer is more preferably 1.2 ⁇ 105 or more, still more preferably 1.5 ⁇ 105 or more.
- the Mw of the modified conjugated diene polymer is preferably 1.5 ⁇ 106 or less. When Mw is larger than 1.5 ⁇ 106 , the processability of the polymer composition tends to decrease.
- the Mw of the modified conjugated diene polymer is more preferably 1.3 ⁇ 106 or less, still more preferably 1.0 ⁇ 106 or less.
- a polymer solution in which the modified conjugated diene polymer obtained by the above modification step is dissolved in a solvent (hereinafter, also referred to as “polymer solution A”) and a surfactant are mixed.
- the reaction solution containing the modified conjugated diene polymer obtained in the above modification step may be used as it is, or the modified conjugated diene polymer contained in the reaction solution may be isolated and appropriate. It may be a solution prepared by dissolving it in a various solvent.
- the solvent for dissolving the isolated modified conjugated diene polymer include the organic solvent exemplified as the solvent that can be used for the polymerization of the monomer. At this time, it is preferable to select an organic solvent capable of dissolving the surfactant.
- reaction solution containing the modified conjugated diene-based polymer obtained by the above modification step as it is as the polymer solution A in that the number of steps can be reduced and the productivity can be further increased. ..
- the content ratio of the modified conjugated diene-based polymer in the polymer solution A is preferably 1% by mass or more, more preferably 2% by mass or more, still more preferably 3% by mass, based on the total amount of the polymer solution A. % Or more.
- the content of the modified conjugated diene polymer in the polymer solution A is preferably 90% by mass or less, more preferably 50% by mass or less, and further preferably 30% by mass or less.
- HLB is a hydrophilic-lipophilic balance, and is a value that changes depending on the balance between the hydrophilic group and the lipophilic group in the molecule.
- the HLB value is obtained by a calculation formula proposed by Griffin (Griffin method; 20 ⁇ (sum of formulas of hydrophilic parts (alkyl ether part, etc.) in surfactant / molecular weight of surfactant)). The value.
- the surfactant C is composed of two or more kinds of surfactants, it means that the value obtained by the weighted average of the HLB values of each component is 9.0 or less.
- the HLB value of the surfactant C is preferably 8.0 or less, preferably 7.0 or less, in that the surfactant C can be retained and stabilized in the rubber to obtain a rubber veil having excellent scorch resistance. It is more preferably less than or equal to, further preferably 6.7 or less, and particularly preferably 6.5 or less.
- the HLB value of the surfactant C is 0 or more.
- the surfactant C is preferably a nonionic surfactant, specifically, a compound represented by the following formula (1), a compound represented by the following formula (2), and the following formula (3). It is preferably at least one selected from the group consisting of the compounds represented by.
- R 1 is a hydrocarbyl group having 10 to 18 carbon atoms
- R 2 and R 3 are independently hydrocarbyl groups or-(R 6 O) r -H.
- R 6 is an ethylene group or a propylene group
- r is an integer of 1 or more. When r is 2 or more, a plurality of R 6s are the same or different from each other.
- X 1 is a single bond, oxygen.
- R 4 is a single bond when X 1 is a single bond
- R 5 is a hydrocarbylene group when X 1 is an oxygen atom or -NR 5- . Hydrogen atom, hydrocarbyl group or-(R 6 O) r -H.)
- R 1 is preferably a saturated or unsaturated linear hydrocarbyl group, more preferably a linear alkyl group or an alkenyl group.
- R 4 is a hydrocarbylene group
- R 4 is preferably a saturated or unsaturated linear hydrocarbylene group, more preferably a linear alkanediyl group or an arcendyl group.
- the carbon number of each group in one molecule is selected so that the HLB is 9.0 or less.
- the surfactant C a compound having a propylene glycol chain (-(R 50 -O) j- , where R 50 is a propylene group and j is an integer of 1 or more) is preferably used. Will be done.
- the R 50 include a 1,2-propylene group and a 1,3-propylene group.
- the surfactant C include polyoxyethylene alkylamine, polyoxypropylene polyoxyethylene alkylamine, polyoxypropylene alkylamine, and polyoxyethylene-alkylpropylene- as compounds represented by the above formula (1).
- Diamine, polyoxypropylene-alkylpropylene-diamine, 1,1'-(dodecyl imino) bis (2-propanol), 2,2'- (dodecyl imino) bisethanol, 2,2'-(hexadecyl imino) bis Examples include ethanol.
- Examples of the compound represented by the above formula (2) include glycerin monostearate and glycerin monooleate.
- Examples of the compound represented by the above formula (3) include polyoxyethylene lauric acid monoethanolamide, polyoxypropylene coconut oil fatty acid monoethanolamide, polyoxypropylene myristic acid monoethanolamide, and polyoxypropylene coconut oil fatty acid monoisopropanolamide. And so on.
- the surfactant C one type may be used alone, or two or more types may be used in combination.
- the form in which the polymer solution A and the surfactant C are mixed is not particularly limited.
- a method of collectively adding the surfactant C to the polymer solution A, a method of dividing the surfactant C, a method of adding the surfactant C in a divided manner, a method of continuously adding the surfactant, and the like can be mentioned. ..
- After adding the surfactant C to the polymer solution A it is preferable to uniformly disperse the surfactant C in the polymer solution A by performing a treatment such as stirring.
- the temperature at which the polymer solution A and the surfactant C are mixed is preferably ⁇ 20 ° C. to 150 ° C., more preferably 0 to 120 ° C., still more preferably 20 to 100 ° C., the same as the temperature of the above-mentioned polymerization reaction. ..
- the ratio of the polymer solution A and the surfactant C to be mixed is preferably 0.05 parts by mass or more of the surfactant C with respect to 100 parts by mass of the modified conjugated diene-based polymer. That is, the blending ratio of the surfactant C is preferably 0.05 parts by mass or more, more preferably 0.1 parts by mass or more, and further preferably 0.2 parts by mass or more with respect to 100 parts by mass of the modified conjugated diene polymer. preferable.
- the blending ratio of the surfactant C is preferably 10 parts by mass or less, more preferably 8 parts by mass or less, still more preferably 5 parts by mass or less, based on 100 parts by mass of the modified conjugated diene polymer.
- the surfactant C By setting the content ratio of the surfactant C to 0.05 parts by mass or more, the surfactant C can be sufficiently dispersed in the polymer solution A, and the fuel efficiency performance is sufficiently improved in the obtained crosslinked product. It is suitable in that it can be done. Further, by setting the content ratio of the surfactant C to 10 parts by mass or less, it is preferable in that the performance deterioration of the modified conjugated diene polymer due to the excessive content of the surfactant C can be suppressed.
- ⁇ Solvent removal step> the solvent is removed from the solution containing the modified conjugated diene polymer obtained by the above mixing step and the surfactant C (hereinafter, also referred to as “mixed solution B”), and the modified conjugated diene polymer is isolated. do.
- a rubber veil can be obtained by subjecting the isolated modified conjugated diene polymer to a drying operation such as heat treatment as necessary and compression molding it into a desired shape (for example, a rectangular parallelepiped shape).
- the method for removing the solvent from the mixed solution A is not particularly limited, for example, a method for separating the solvent by steam stripping, dehydration / drying of the obtained polymer, a method for devolatile with a twin-screw extruder or the like, and a drum dryer. It can be carried out by a known desolvation method such as a method of directly devolatile with or the like. Of these, the method of contacting the mixed solution B with water to remove the solvent is preferable because the desolvation treatment can be easily performed. In this production method, in the above mixing step, a surfactant C having an HLB value of 9.0 or less is used as an additive to be mixed with the polymer solution A.
- the surfactant C can remain in the system, and a sufficient amount of the surfactant C and the modified conjugated diene polymer are used. Can be kept mixed. This is preferable in that even when steam stripping is adopted, the effect of improving the scorch resistance and processability of the polymer composition and the fuel efficiency performance of the crosslinked product can be sufficiently obtained.
- a component (additive) different from that of the modified conjugated diene-based polymer is blended as long as the effects of the present disclosure are not impaired. You may.
- additives include spreading oils, antioxidants and the like.
- the polymer composition of the present disclosure can be obtained by adding a reinforcing filler to the rubber veil. Further, the polymer composition of the present disclosure further contains components (other components) different from the modified conjugated diene-based polymer and the surfactant contained in the rubber veil, as long as the effects of the present disclosure are not impaired. May be good.
- the reinforcing filler and other components that can be contained in the polymer composition will be described.
- the reinforcing filler is added to the rubber veil to increase the strength of the crosslinked body.
- the reinforcing filler include silica, carbon black, an inorganic compound represented by the following formula (4) (hereinafter, also referred to as “inorganic compound (M)”), and reinforcing fibers (for example, glass fiber and carbon fiber). Inorganic fibers such as, organic fibers such as nylon and polyester) and the like.
- the reinforcing filler is preferably at least one selected from the group consisting of silica, carbon black and the inorganic compound (M).
- M 1 is a specific metal which is any of aluminum, magnesium, titanium and calcium, an oxide of the specific metal, a hydroxide of the specific metal, a hydrate of the oxide of the specific metal, and At least one selected from the group consisting of hydroxide hydrates of a specific metal.
- N is an integer of 1 to 5
- m is an integer of 0 to 10
- k is an integer of 2 to 5.
- i is an integer from 0 to 10.
- silica examples include wet silica (hydrous silicic acid), dry silica (silicic anhydride), colloidal silica, precipitated silica, calcium silicate, aluminum silicate and the like.
- wet silica is particularly preferable from the viewpoint of improving the fracture characteristics and the effect of achieving both wet grip and low rolling resistance.
- high dispersion type silica from the viewpoint of improving the dispersibility in the polymer composition and improving the physical properties and processability.
- carbon black examples include GPF, FEF, HAF, ISAF, SAF, and the like, but the carbon black is not particularly limited.
- various reinforcing fillers such as clay and calcium carbonate may be further blended in the polymer composition.
- the inorganic compound (M) include compounds in which the specific metal is aluminum, such as aluminum oxide, alumina monohydrate, aluminum hydroxide, aluminum carbonate, aluminum silicate, and calcium oxide (Al 2 O 3 ). CaO ⁇ 2SiO 4 etc.);
- a compound whose specific metal is magnesium for example, magnesium oxide, magnesium hydroxide, magnesium carbonate, magnesium silicate, calcium silicate (CaMgSiO 4 ), talc, etc.
- Examples of the compound are, for example, titanium oxide; examples of the compound in which the specific metal is calcium include calcium oxide, calcium hydroxide, calcium carbonate, calcium silicate and the like.
- the reinforcing filler one of silica, carbon black and the inorganic compound (M) may be used alone, or two or more of these may be used in combination.
- the polymer composition preferably contains silica as a reinforcing filler because it has a high effect of improving tire characteristics in combination with a modified conjugated diene-based polymer, and among them, wet silica, dry silica, and colloidal. It is preferable to use silica.
- the content ratio of the reinforcing filler in the polymer composition (the total amount when two or more kinds are contained) is the total amount of the polymer components contained in the polymer composition. The amount is preferably 25 to 130 parts by mass, more preferably 30 to 110 parts by mass with respect to 100 parts by mass.
- the polymer composition usually contains a cross-linking agent.
- the cross-linking agent include sulfur, sulfur halides, organic peroxides, quinonedioximes, organic polyvalent amine compounds, alkylphenol resins having a methylol group, and the like, and sulfur is usually used.
- the blending amount of sulfur is preferably 0.1 to 5 parts by mass, and more preferably 0.5 to 3 parts by mass with respect to 100 parts by mass of the total amount of rubber components contained in the polymer composition.
- the polymer composition may further contain a rubber component (hereinafter, also referred to as “another rubber component”) different from that of the modified conjugated diene-based polymer.
- a rubber component hereinafter, also referred to as “another rubber component”
- the "rubber component” contained in the polymer composition means a polymer capable of obtaining a cured product exhibiting rubber elasticity by thermosetting.
- the cured product exhibits a property that it undergoes large deformation (for example, deformation that expands more than twice when stretched at room temperature) with a small force at room temperature, and rapidly returns to almost its original shape when the force is removed.
- the type of other rubber components is not particularly limited, but unmodified rubber is preferable, and for example, butadiene rubber (BR, for example, high cis BR having 90% or more cis-1,4 bond), styrene butadiene rubber (SBR), and natural rubber. (NR), isoprene rubber (IR), styrene isoprene copolymer rubber, butadiene isoprene copolymer rubber and the like can be mentioned.
- the blending amount of the other rubber components is preferably 5 to 60 parts by mass with respect to 100 parts by mass of the total amount of the rubber components (modified conjugated diene-based polymer and other rubber components) contained in the polymer composition. It is preferably 10 to 50 parts by mass.
- the polymer composition may contain, for example, an antiaging agent, zinc oxide, stearic acid, a softening agent, sulfur, a vulcanization accelerator, a silane coupling agent, a compatibilizer, a vulcanization aid, and a process.
- an antiaging agent zinc oxide, stearic acid, a softening agent, sulfur, a vulcanization accelerator, a silane coupling agent, a compatibilizer, a vulcanization aid, and a process.
- Various additives generally used in polymer compositions for tires and the like, such as oils, processing aids and anti-sulfur agents, can be blended. These blending ratios can be appropriately selected according to various components as long as the effects of the present disclosure are not impaired.
- a rubber veil containing the above-mentioned modified conjugated diene polymer and a surfactant, and additives other than the vulcanization-based compounding agent (crosslinking agent, vulcanization accelerator, vulcanization aid) (hereinafter, "first”.
- additive additives other than the vulcanization-based compounding agent (crosslinking agent, vulcanization accelerator, vulcanization aid)
- first step a rubber veil containing the above-mentioned modified conjugated diene polymer and a surfactant, and additives other than the vulcanization-based compounding agent (crosslinking agent, vulcanization accelerator, vulcanization aid)
- first additive
- the first additive preferably contains at least a reinforcing filler.
- the first additive may contain a surfactant as long as the effects of the present disclosure are not impaired.
- the content of the surfactant in the first additive is preferably 10 parts by mass or less, more preferably 5 parts by mass or less, based on 100 parts by mass of the surfactant used in the mixing step. , More preferably 1 part by mass or less.
- the kneading temperature in the first step is appropriately set according to the melting point of the polymer component, the glass transition point, and the like. By this melt-kneading, the first additive is mixed with the polymer component to increase the strength of the rubber product after vulcanization, improve the kneading processability of the polymer composition, and radicals generated during kneading. It is possible to sufficiently obtain effects such as preventing deterioration of rubber due to the above.
- a crosslinked product can be obtained by molding the polymer composition obtained in the second step and then cross-linking (vulcanizing) the polymer composition.
- the crosslinked product obtained by using the above polymer composition can be applied to various rubber products.
- various rubber products include tire applications such as tire treads, under treads, carcasses, sidewalls, and bead parts; sealing materials for packings, gaskets, weather strips, O-rings, etc .; automobiles, ships, aircraft, railways, etc. Interior / exterior skin materials for various vehicles such as; Building materials; Anti-vibration rubbers for industrial machinery and equipment; Various hoses and hose covers such as diaphragms, rolls, radiator hoses, air hoses; Power transmission belts, etc. Belts; linings; dust boots; materials for medical equipment; rubber barriers; insulating materials for electric wires; other industrial products and the like.
- the polymer composition obtained by using the rubber veil of the present disclosure is particularly suitable as a material for one or both of the tread and sidewall of the tire.
- Tires can be manufactured according to the usual method. For example, a polymer composition containing a polymer component and a component to be blended as necessary is mixed by a kneader, and a sheet-like product is placed in a predetermined position according to a conventional method and vulcanized. Formed as tread rubber or sidewall rubber, pneumatic tires are obtained.
- the solvent was removed by steam stripping (steam temperature: 190 ° C.), and the polymer D was obtained by drying with a heat roll adjusted to 110 ° C.
- the properties of polymer D are shown in Table 1 below.
- N-Si-1 (* 1): 3- (4-trimethylsilyl-1-piperazino) propyltriethoxysilane
- N-Si-2 (* 2): A compound represented by the above formula (N-Si-2)
- Amizet 1PC Nonion surfactant manufactured by Kawaken Fine Chemicals, polyoxypropylene coconut oil
- Examples 1 to 5 Comparative Examples 1 to 9
- Each component was blended according to the blending formula shown in Table 2 below, and the mixture was melt-kneaded to produce a polymer composition. Kneading was performed by the following method. Batch type mixer with temperature control device (manufactured by Toyo Seiki Seisakusho; brand name: Labplast mill is used, and as the first stage kneading, the set temperature is adjusted to 100 ° C, the rotation speed is 60 rpm, and the kneading time is 4 minutes.
- Polymer compositions were obtained by kneading under the conditions of several 60 rpm and a kneading time of 1.5 minutes.
- the temperature at the time of discharging the kneaded material discharged from the mixer was 100 ° C. or lower.
- each of the obtained polymer compositions was vulcanized and molded by a vulcanization press at 160 ° C. for a predetermined time to obtain a crosslinked rubber as a crosslinked product.
- the following physical property evaluations (1) to (4) were carried out using the obtained crosslinked rubber. The results are shown in Table 2 below.
- Mooney viscosity Using the kneaded product before vulcanization as a measurement sample, in accordance with JIS K6300-1: 2013, using a Mooney tester (manufactured by Alpha Technology), using an L rotor, preheating 1 minute, rotor operating time 4 minutes. , The measurement was carried out under the condition of a temperature of 100 ° C. It is shown as an index with Comparative Example 6 as 100, and the larger the value, the better the processability of the polymer composition.
- a polymer solution containing a modified conjugated diene-based polymer and a surfactant having an HLB value of 9.0 or less are mixed, and then the solvent is removed from the mixed solution to obtain workability and processability.
- Polymer compositions having excellent scorch resistance (Examples 1 to 5) could be obtained.
- the polymer compositions of Examples 1 to 5 had a high filler uptake rate and were excellent in productivity.
- the crosslinked rubber produced by using the polymer compositions of Examples 1 to 5 was also excellent in fuel efficiency.
- Comparative Examples 1 to 3 in which the polymer composition was produced in the same manner as in Examples 1 to 5 except that the surfactant was not added to the polymer solution, the interface having an HLB value larger than 9.0. Comparative Examples 4 and 5 using the activator were inferior to Examples 1 to 5 in at least one of the characteristics of processability, scorch resistance, filler uptake speed, and fuel efficiency. Further, in Comparative Example 9 using the terminal-unmodified conjugated diene polymer, the processability, scorch resistance and filler uptake speed were the same as those in Examples 1 to 5, but the fuel efficiency performance was significantly inferior. ..
- Comparative Examples 6 to 8 in which the surfactant was added during the first-stage kneading instead of adding the surfactant to the polymer solution had lower scorch resistance and lower scorch resistance than Examples 1 to 5. At least one of the fuel economy performance was inferior.
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Abstract
Description
[2]変性共役ジエン系重合体が溶媒に溶解された重合体溶液と、HLBが9.0以下である界面活性剤とを混合する混合工程と、前記混合工程により得られた溶液から溶媒を除去する脱溶媒工程と、を含む、ゴムベールの製造方法。
[3]上記[1]のゴムベールに、シリカ、カーボンブラック及び下記式(4)で表される無機化合物よりなる群から選ばれる少なくとも1種の補強性充填剤が配合されてなる、重合体組成物。
nM1・mSiOk・iH2O …(4)
(式(4)中、M1は、アルミニウム、マグネシウム、チタン及びカルシウムのいずれかである特定金属、前記特定金属の酸化物、前記特定金属の水酸化物、前記特定金属の酸化物の水和物、及び前記特定金属の水酸化物の水和物よりなる群から選ばれる少なくとも1種である。nは1~5の整数であり、mは0~10の整数であり、kは2~5の整数であり、iは0~10の整数である。)
[4]上記[4]の重合体組成物を用いて得られる架橋体。
[5]上記[4]の重合体組成物によりトレッド及びサイドウォールの一方又は両方が形成されたタイヤ。
本開示のゴムベールは、ゴム製品の材料である合成ゴムを圧縮成形することにより得られる、例えば直方体状の塊である。このゴムベールに各種の添加剤が配合されて混練され、さらに成形や加硫等の工程を経ることにより、最終的にゴム製品が製造される。本開示のゴムベールは、変性共役ジエン系重合体と、HLBが9.0以下である界面活性剤とを含有する。以下では、ゴムベールの製造方法について説明しつつ、当該ゴムベールに含まれる各成分について説明する。
重合工程:重合開始剤の存在下で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。
変性工程:上記重合により得られた共役ジエン系重合体が有する活性末端と、ヒドロカルビルオキシシリル基及び窒素含有基を有する化合物(以下「末端変性剤」ともいう)とを反応させる工程。
混合工程:変性共役ジエン系重合体が溶剤に溶解された重合体溶液と界面活性剤とを混合する工程。
脱溶媒工程:変性共役ジエン系重合体と界面活性剤を含む溶液から溶媒を除去する工程。
以下に、各工程について詳しく説明する。
(共役ジエン化合物)
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、及び2,3-ジメチル-1,3-ブタジエンが好ましく、加工性とヒステリシスロス低減とをバランス良く改善する効果が高い点で、1,3-ブタジエンが特に好ましい。なお、共役ジエン化合物は、1種を単独で又は2種以上を組み合わせて使用することができる。
本工程では、上記重合工程により得られた共役ジエン系重合体が有するアルカリ金属活性末端又はアルカリ土類金属活性末端と、末端変性剤とを反応させる。活性末端を有する共役ジエン系重合体と末端変性剤とを反応させることにより、窒素含有基を主鎖末端に有する重合体を得ることができる。なお、本明細書において「活性末端」とは、分子鎖の端に存在する、炭素-炭素二重結合を有するモノマーに由来する構造以外の部分(より具体的には金属末端)を意味する。
R34のm価の炭化水素基は、炭化水素からm個の水素原子を取り除いた基である。これらのうち、R34のm価の炭化水素基は、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(m価の芳香環基)であることが好ましい。該芳香族炭化水素の具体例としては、例えばベンゼン環、ナフタレン環、アントラセン環等の単環又は縮合環、及びこれらの環の2個以上が単結合で結合された構造が挙げられる。
mは、重合体組成物の加工性をより良好にする観点から、2~6が好ましい。nは、シリカ分散性の改善効果をより高くできる点で、2又は3が好ましく、3がより好ましい。
a、c及びdは、シリカ分散性の改善効果をより高くできる点で、2又は3が好ましく、3がより好ましい。bは、1~5が好ましく、1~3がより好ましい。
上記式(7)で表される化合物としては、例えば1-トリメチルシリル-2,2-ジメトキシ-1-アザ-2-シラシクロペンタン、1-トリエチルシリル-2,2-ジエトキシ-1-アザ-2-シラシクロペンタン、2,2-ジメトキシ-1-(3-トリメトキシシリルプロピル)-1,2-アザシロリジン、2,2-ジメトキシ-1-フェニル-1,2-アザシロリジン、2-(2,2-ジメトキシ-1,2-アザシロリジン-1-イル)-N,N-ジエチルエタン-1-アミン等を挙げることができる。
本工程では、上記変性工程により得られた変性共役ジエン系重合体が溶媒に溶解された重合体溶液(以下「重合体溶液A」ともいう)と、界面活性剤とを混合する。
界面活性剤としては、HLBが9.0以下であって1分子内に親水基と親油基とを有する化合物(以下「界面活性剤C」ともいう)が用いられる。ここで、HLBは、親水親油バランス(Hydrophilic-Lipophilic Balance)であり、分子内の親水基と親油基とのつり合いにより変化する値である。HLBは、数値が大きいほど親水性が高いことを表す。本明細書においてHLB値は、Griffinによって提唱された計算式(グリフィン法;20×(界面活性剤中の親水部(アルキルエーテル部等)の式量の総和/界面活性剤分子量))により求められる値である。界面活性剤Cが2種以上の界面活性剤からなる場合、各成分のHLB値の加重平均により求められる値が9.0以下であることを意味する。
上記式(2)で表される化合物としては、モノステアリン酸グリセリン、モノオレイン酸グリセリン等が挙げられる。
上記式(3)で表される化合物としては、ポリオキシエチレンラウリン酸モノエタノールアミド、ポリオキシプロピレンヤシ油脂肪酸モノエタノールアミド、ポリオキシプロピレンミリスチン酸モノエタノールアミド、ポリオキシプロピレンヤシ油脂肪酸モノイソプロパノールアミド等が挙げられる。界面活性剤Cとしては、1種を単独で使用してもよく、2種以上を組み合わせて使用してもよい。
本工程では、上記混合工程により得られた変性共役ジエン系重合体と界面活性剤Cを含む溶液(以下「混合溶液B」ともいう)から溶媒を除去し、変性共役ジエン系重合体を単離する。この単離された変性共役ジエン系重合体に対し、必要に応じて熱処理等の乾燥の操作を行い、所望の形状(例えば直方体形状)に圧縮成形することによりゴムベールを得ることができる。
本開示の重合体組成物は、上記ゴムベールに補強性充填剤を配合することにより得ることができる。また、本開示の重合体組成物は、本開示の効果を損なわない限り、上記ゴムベールに含まれる変性共役ジエン系重合体及び界面活性剤とは異なる成分(その他の成分)をさらに含有していてもよい。以下に、重合体組成物に含ませることができる補強性充填剤及びその他の成分について説明する。
補強性充填剤は、架橋体の強度を高めるためにゴムベールに配合される。補強用充填剤としては、例えばシリカ、カーボンブラック、下記式(4)で表される無機化合物(以下、「無機化合物(M)」ともいう。)、強化用繊維(例えば、ガラス繊維や炭素繊維等の無機系繊維、ナイロンやポリエステル等の有機系繊維)等が挙げられる。これらのうち、補強用充填剤は、シリカ、カーボンブラック及び無機化合物(M)よりなる群から選ばれる少なくとも1種が好ましい。
nM1・mSiOk・iH2O …(4)
(式(4)中、M1は、アルミニウム、マグネシウム、チタン及びカルシウムのいずれかである特定金属、特定金属の酸化物、特定金属の水酸化物、特定金属の酸化物の水和物、及び特定金属の水酸化物の水和物よりなる群から選ばれる少なくとも1種である。nは1~5の整数であり、mは0~10の整数であり、kは2~5の整数であり、iは0~10の整数である。)
重合体組成物には、通常、架橋剤が含有される。架橋剤としては、硫黄、ハロゲン化硫黄、有機過酸化物、キノンジオキシム類、有機多価アミン化合物、メチロール基を有するアルキルフェノール樹脂等が挙げられ、通常、硫黄が使用される。硫黄の配合量は、重合体組成物に含まれるゴム成分の合計量100質量部に対して、好ましくは0.1~5質量部、より好ましくは0.5~3質量部である。
重合体組成物には、変性共役ジエン系重合体とは異なるゴム成分(以下「他のゴム成分」ともいう)がさらに配合されていてもよい。なお、本明細書において、重合体組成物に含まれる「ゴム成分」とは、熱硬化によりゴム弾性を示す硬化物を得ることが可能な重合体をいう。当該硬化物は、室温において小さな力で大きな変形(例えば、室温で伸ばすと2倍以上に伸びる変形)を起こし、力を取り除くと急速にほぼ元の形状に戻る性質を示す。
上記重合体組成物は、ゴムベールと補強性充填剤のほか、必要に応じて配合される成分を、開放式混練機(例えば、ロール)、密閉式混練機(例えば、バンバリーミキサー)等の混練機を用いて混合(具体的には混練)することにより製造できる。
上記重合体組成物を用いて得られる架橋体は各種ゴム製品に適用可能である。各種ゴム製品の具体例としては、例えばタイヤトレッド、アンダートレッド、カーカス、サイドウォール、ビード部等のタイヤ用途;パッキン、ガスケット、ウェザーストリップ、O-リング等のシール材;自動車、船舶、航空機、鉄道等の各種車両用の内外装表皮材;建築材料;産業機械用や設備用などの防振ゴム類;ダイヤフラム、ロール、ラジエータホース、エアーホース等の各種ホース及びホースカバー類;動力伝達用ベルトなどのベルト類;ライニング;ダストブーツ;医療用機器材料;防舷材;電線用絶縁材料;その他の工業品等が挙げられる。
(2)ビニル基含量(%):500MHzの1H-NMR測定によって算出した。
(3)変性前の重合体の重量平均分子量:下記の条件にて、ゲルパーミエーションクロマトグラフィー(GPC)装置「HLC-8120GPC」(東ソー株式会社製)によって測定を行い、得られたGPC曲線の最大ピーク頂点に相当する保持時間から、ポリスチレン換算の重量平均分子量(Mw)を求めた。
(GPC条件)
カラム;商品名「GMHXL」(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
(4)ムーニー粘度(MV):JIS K6300-1に準拠し、Lローターを用い、予熱1分間、ローター作動時間4分間、温度100℃の条件で測定した。
[合成例1:重合体Aの合成]
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2500g、テトラヒドロフラン50g、スチレン125g、1,3-ブタジエン365gを仕込んだ。反応器内容物の温度を10℃に調整した後、n-ブチルリチウム5.20mmol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26分経過後に)、1,3-ブタジエン10gを2分間かけて追加し、更に3分間重合させた後、3-(4-トリメチルシリル-1-ピペラジノ)プロピルトリエトキシシラン4.46mmolを加えて15分間反応を行い、変性共役ジエン系重合体溶液を得た。
得られた変性共役ジエン系重合体溶液に、ペンタエリトリトールテトラキス[3-(3,5-ジ-tert-ブチル-4-ヒドロキシフェニル)プロピオナート]を添加し、次いでスチームストリッピング(スチーム温度:190℃)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重合体Aを得た。重合体Aの性質を下記表1に示した。
合成例1において3-(4-トリメチルシリル-1-ピペラジノ)プロピルトリエトキシシラン4.46mmolの代わりに、下記式(N-Si-2)で表される化合物を1.30mmol使用したこと以外は合成例1と同様の方法により重合体Bを得た。重合体Bの性質を下記表1に示した。
合成例1において3-(4-トリメチルシリル-1-ピペラジノ)プロピルトリエトキシシランを使用しなかったこと以外は合成例1と同様の方法により、未変性の共役ジエン系重合体として重合体Cを得た。重合体Cの性質を表1に示した。
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2500g、テトラヒドロフラン50g、スチレン125g、1,3-ブタジエン365gを仕込んだ。反応器内容物の温度を10℃に調整した後、n-ブチルリチウム5.20mmol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26分経過後に)、1,3-ブタジエン10gを2分間かけて追加し、更に3分間重合させた後、3-(4-トリメチルシリル-1-ピペラジノ)プロピルトリエトキシシラン4.46mmolを加えて15分間反応を行い、変性共役ジエン系重合体溶液を得た。
得られた変性共役ジエン系重合体溶液に、ペンタエリトリトールテトラキス[3-(3,5-ジ-tert-ブチル-4-ヒドロキシフェニル)プロピオナート]を添加し、次いで、この変性共役ジエン系重合体溶液に、リポノールC/18-18(ライオン社製ノニオン界面活性剤、ポリオキシプロピレンポリオキシエチレンアルキル(C8~C18)アミン、HLB=6.4)を2.5g添加し、混合した。次いで、スチームストリッピング(スチーム温度:190℃)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重合体Dを得た。重合体Dの性質を下記表1に示した。
合成例4において使用する末端変性剤及び界面活性剤の種類及び量を下記表1に記載のとおり変更したこと以外は合成例4と同様の方法により重合体E~Kをそれぞれ得た。なお、合成例11では、末端変性剤を使用しなかった。重合体E~Kの性質を下記表1にそれぞれ示した。
(末端変性剤)
N-Si-1(*1):3-(4-トリメチルシリル-1-ピペラジノ)プロピルトリエトキシシラン
N-Si-2(*2):上記式(N-Si-2)で表される化合物
(界面活性剤)
a-1:リポノールC/18-18(ライオン社製ノニオン界面活性剤、ポリオキシプロピレンポリオキシエチレンアルキル(C8~C18)アミン、HLB=6.4)
a-2:FT-6020J(ライオン社製ノニオン界面活性剤、ポリオキシプロピレンアルキル(C8~C18)アミン、HLB=0)
a-3:レオスタットGS-95P(ライオン社製ノニオン界面活性剤、モノステアリン酸グリセリン、HLB=6.5)
a-4:アミゼット1PC(川研ファインケミカル社製ノニオン界面活性剤、ポリオキシプロピレンヤシ油脂肪酸モノイソプロパノールアミド、HLB=9.0)
a-5:ナイミーンS-210(日油製ノニオン界面活性剤、ポリオキシエチレンステアリルアミン、HLB=12.5)
a-6:リポノールT/25(ライオン社製ノニオン界面活性剤、ポリオキシエチレンアルキルアミン、HLB=14.0)
なお、界面活性剤のHLB値は、グリフィン法で計算した値である。
下記表2に示す配合処方により各成分を配合し、これを溶融混練することによって重合体組成物を製造した。混練は以下の方法で行った。
温度制御装置を付属したバッチ式ミキサー(東洋精機製作所製;商品名ラボプラストミルを使用し、一段目の混練として、設定温度を100℃に温調して、回転数60rpm、混練時間4分の条件で、(変性)共役ジエン系重合体、ポリブタジエンゴム、伸展油、シリカ、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。なお、比較例6~8では、さらに界面活性剤を配合した。ミキサーから排出された混練物の排出時の温度は、いずれも150℃前後であった。
次いで、二段目の混練として、一段目の混練により得られた混練物を室温まで冷却後、加硫促進剤及び硫黄を上記ミキサーに配合し、設定温度を70℃に温調して、回転数60rpm、混練時間1.5分の条件で混練することにより重合体組成物をそれぞれ得た。ミキサーから排出された混練物の排出時の温度はいずれも100℃以下であった。次に、得られた各重合体組成物を160℃で所定時間、加硫プレスにて加硫成形を行うことにより、架橋体として架橋ゴムを得た。得られた架橋ゴムを用いて、以下の物性評価(1)~(4)を行った。それらの結果を下記表2に示した。
加硫前の混練物を測定用試料とし、JIS K6300-1:2013に準拠し、ムーニー試験機(アルファテクノロジー社製)を用い、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。比較例6を100とした指数で示し、数値が大きいほど、重合体組成物の加工性が良好である。
(2)フィラー取り込み速度
一段目の混練において、混錬物のトルク変化を上記バッチ式ミキサーにより測定し、混錬物のトルクがシリカ投入後にピークに到達するまでの時間(これを「ピーク到達時間」とする)の逆数を算出した。比較例6を100とした指数で示し、数値が大きいほどピーク到達時間が短く、生産性が高いことを示す。
(3)耐スコーチ性
ムーニー試験機(アルファテクノロジー社製)を用い、JIS K6300-1:2013に準拠し、L型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125℃の条件で測定し、粘度の最低値(Vm)から5ポイント上昇するまでの時間(t5)を耐スコーチ性の指標とした。比較例6を100とした指数で表示し、数値が大きいほど耐スコーチ性が良好であることを示す。
(4)損失正接(50℃tanδ 転がり抵抗)
せん断型動的スペクトロメーター(TAインスツルメント社製)を用い、角速度100ラジアン毎秒、温度50℃の条件にてせん断歪1%の条件にて貯蔵弾性率G’に対する損失弾性率G’’の比(50℃tanδ)を測定した。比較例6を100とした指数で示し、数値が大きいほど転がり抵抗が小さく、低燃費性能が良好であることを示す。
Claims (15)
- 変性共役ジエン系重合体と、
HLBが9.0以下である界面活性剤と、
を含有する、ゴムベール。 - 前記界面活性剤は、下記式(1)で表される化合物、下記式(2)で表される化合物、及び下記式(3)で表される化合物よりなる群から選択される少なくとも1種である、請求項1に記載のゴムベール。
- 前記変性共役ジエン系重合体100質量部に対し、前記界面活性剤を0.05~10質量部含有する、請求項1又は2に記載のゴムベール。
- 前記変性共役ジエン系重合体は、ヒドロカルビルオキシシリル基と窒素含有基とを重合体末端に有する、請求項1~3のいずれか一項に記載のゴムベール。
- 前記界面活性剤は、プロピレングリコール鎖を有する、請求項1~4のいずれか一項に記載のゴムベール。
- 前記変性共役ジエン系重合体の重量平均分子量が1.0×105以上1.5×106以下である、請求項1~5のいずれか一項に記載のゴムベール。
- タイヤのトレッド又はサイドウォール用である、請求項1~6のいずれか一項に記載のゴムベール。
- 変性共役ジエン系重合体が溶媒に溶解された重合体溶液と、HLBが9.0以下である界面活性剤とを混合する混合工程と、
前記混合工程により得られた溶液から溶媒を除去する脱溶媒工程と、
を含む、ゴムベールの製造方法。 - 前記混合工程において、前記変性共役ジエン系重合体100質量部に対し、前記界面活性剤を0.05~10質量部配合する、請求項8に記載のゴムベールの製造方法。
- 前記脱溶媒工程において、前記混合工程で得られた溶液を水に接触させて脱溶媒する、請求項8又は9に記載のゴムベールの製造方法。
- 活性末端を有する共役ジエン系重合体と、ヒドロカルビルオキシシリル基及び窒素含有基を有する化合物と、を反応させて前記変性共役ジエン系重合体を得る工程をさらに含む、請求項8~10のいずれか一項に記載のゴムベールの製造方法。
- 前記界面活性剤は、下記式(1)で表される化合物、下記式(2)で表される化合物、及び下記式(3)で表される化合物よりなる群から選択される少なくとも1種である、請求項8~11のいずれか一項に記載のゴムベールの製造方法。
- 請求項1~7のいずれか一項に記載のゴムベールに、シリカ、カーボンブラック及び下記式(4)で表される無機化合物よりなる群から選ばれる少なくとも1種の補強性充填剤が配合されてなる、重合体組成物。
nM1・mSiOk・iH2O …(4)
(式(4)中、M1は、アルミニウム、マグネシウム、チタン及びカルシウムのいずれかである特定金属、前記特定金属の酸化物、前記特定金属の水酸化物、前記特定金属の酸化物の水和物、及び前記特定金属の水酸化物の水和物よりなる群から選ばれる少なくとも1種である。nは1~5の整数であり、mは0~10の整数であり、kは2~5の整数であり、iは0~10の整数である。) - 請求項13に記載の重合体組成物を用いて得られる架橋体。
- 請求項13に記載の重合体組成物によりトレッド及びサイドウォールの一方又は両方が形成されたタイヤ。
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EP21880185.0A EP4230435A4 (en) | 2020-10-16 | 2021-10-14 | RUBBER BALL, PRODUCTION METHOD THEREFOR, POLYMER COMPOSITION, CROSS-LINKED OBJECT AND TIRE |
CN202180070413.5A CN116348313A (zh) | 2020-10-16 | 2021-10-14 | 橡胶块及其制造方法、聚合物组合物、交联体及轮胎 |
JP2022557436A JPWO2022080450A1 (ja) | 2020-10-16 | 2021-10-14 | |
US18/248,945 US20240002642A1 (en) | 2020-10-16 | 2021-10-14 | Rubber bale, production method therefor, polymer composition, crosslinked object, and tire |
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CN116348313A (zh) | 2023-06-27 |
KR20230057468A (ko) | 2023-04-28 |
EP4230435A4 (en) | 2024-04-03 |
JPWO2022080450A1 (ja) | 2022-04-21 |
EP4230435A1 (en) | 2023-08-23 |
US20240002642A1 (en) | 2024-01-04 |
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