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WO2016084863A1 - Élastomère polyfonctionnel à terminaison modifiée, son procédé de production et composition de caoutchouc pour pneu - Google Patents

Élastomère polyfonctionnel à terminaison modifiée, son procédé de production et composition de caoutchouc pour pneu Download PDF

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Publication number
WO2016084863A1
WO2016084863A1 PCT/JP2015/083117 JP2015083117W WO2016084863A1 WO 2016084863 A1 WO2016084863 A1 WO 2016084863A1 JP 2015083117 W JP2015083117 W JP 2015083117W WO 2016084863 A1 WO2016084863 A1 WO 2016084863A1
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Prior art keywords
compound
polyfunctional
group
aromatic vinyl
copolymer
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English (en)
Japanese (ja)
Inventor
和也 上西
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Yokohama Rubber Co Ltd
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Yokohama Rubber Co Ltd
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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
    • 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
    • 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
    • C08F8/00—Chemical modification by after-treatment
    • C08F8/42—Introducing metal atoms or metal-containing groups
    • 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
    • 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 invention relates to a polyfunctional end-modified elastomer, a method for producing the same, and a rubber composition for tires.
  • silica has been used as a compounding agent for tires.
  • a tire containing silica is characterized by low rolling resistance and low fuel consumption.
  • silica is inferior in dispersibility in rubber, various attempts have been made to increase the dispersibility of silica in rubber.
  • the present invention provides a polyfunctional end-modified elastomer excellent in affinity with silica, a method for producing the same, and a rubber composition for tires.
  • the present inventors copolymerize a conjugated diene compound and a monofunctional aromatic vinyl compound using an initiator obtained by using a polyfunctional aromatic vinyl compound and an organic alkali metal compound in a predetermined ratio.
  • an initiator obtained by using a polyfunctional aromatic vinyl compound and an organic alkali metal compound in a predetermined ratio.
  • the polyfunctional terminal-modified elastomer of the present invention is a polyfunctional terminal-modified elastomer that is a copolymer of a conjugated diene compound and a monofunctional aromatic vinyl compound, and includes a polyfunctional aromatic vinyl compound and an organic alkali metal compound.
  • R 1 represents a hydrogen atom or a monovalent organic group
  • R 2 represents a hydrogen atom, a halogen atom, or a monovalent organic group
  • m represents an integer of 0 or more and 3 or less
  • n represents an integer of 0 or more and 3 or less (where m + n is an integer of 1 or more and 3 or less).
  • the dispersion (Mw / Mn) may be 1 or more and 3 or less.
  • the amount of the monofunctional aromatic vinyl compound used / the amount of the conjugated diene compound used is 1/9 or more and 9/1 or less in the copolymerization. Can do.
  • the polyfunctional aromatic vinyl compound in the copolymerization, may be a compound represented by the following formula (2).
  • R 3 and R 4 are the same or different and are a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an aryl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, or a silyloxy group Represents.
  • the organic alkali metal compound can be an organic lithium compound.
  • a tire rubber composition according to an aspect of the present invention includes the multifunctional terminal-modified elastomer according to any one of 1 to 5 above.
  • a polyfunctional aromatic vinyl compound and an organic alkali metal compound are used as follows: the polyfunctional aromatic vinyl compound / the organic alkali metal compound (molar ratio).
  • R 1 , R 2 and X are respectively synonymous with R 1 , R 2 and X in the formula (1), a represents an integer of 0 or more and 4 or less, and b is 0 or more and 4 The following integers are represented (where a + b is an integer of 2 or more and 4 or less).
  • the polyfunctional terminal-modified elastomer according to any one of 1 to 5 described above is a polyfunctional aromatic vinyl compound and an organic alkali metal compound, wherein the polyfunctional aromatic vinyl compound / the organic alkali metal compound (molar ratio) is 0.2.
  • the rubber composition for tires described in 6 above includes the polyfunctional terminal-modified elastomer described in any one of 1 to 5 above having excellent affinity with silica, the dispersibility of silica is good. Therefore, by using the tire rubber composition, it is possible to manufacture a tire in which both reduction in rolling resistance and stability on a wet road surface are achieved. For this reason, this rubber composition for tires can be used conveniently, for example as a rubber composition for pneumatic tires for cars.
  • the initiator obtained by the step of preparing the initiator functions as a polyfunctional initiator.
  • a polymer can be obtained.
  • the compound represented by the above general formula (3) or an alcohol having 1 to 10 carbon atoms is reacted with the terminal of the copolymer to have a weight average molecular weight of 10,000 to 3,000,000. It is possible to obtain a polyfunctional terminal-modified elastomer which is a copolymer and has a group excellent in affinity with silica and disposed on the surface.
  • parts means “parts by mass” and “%” means “mass%” unless otherwise specified.
  • the polyfunctional terminal-modified elastomer according to one embodiment of the present invention is a polyfunctional terminal-modified elastomer that is a copolymer of a conjugated diene compound and a monofunctional aromatic vinyl compound.
  • the polyfunctional terminal-modified elastomer according to this embodiment comprises a polyfunctional aromatic vinyl compound and an organic alkali metal compound, wherein the polyfunctional aromatic vinyl compound / the organic alkali metal compound (molar ratio) is 0.2 or more and 0.
  • the polyfunctional terminal-modified elastomer according to the present embodiment is a group represented by the following general formula (1), an alkoxy metal group having 1 to 10 carbon atoms, or hydrogen at the terminal of the copolymer contained in the elastomer. Has atoms.
  • the group represented by the following general formula (1) or the alkoxy metal group having 1 to 10 carbon atoms is excellent in affinity with silica. For this reason, in the polyfunctional terminal-modified elastomer according to the present embodiment, the above-mentioned group is contained at the terminal of the copolymer, whereby the polyfunctional terminal-modified elastomer according to the present embodiment is converted into a tire containing silica. When blended with the rubber composition for use, the dispersibility of silica in the rubber can be enhanced.
  • R 1 represents a hydrogen atom or a monovalent organic group
  • R 2 represents a hydrogen atom, a halogen atom, or a monovalent organic group
  • m represents an integer of 0 or more and 3 or less
  • n represents an integer of 0 or more and 3 or less (where m + n is an integer of 1 or more and 3 or less).
  • the polyfunctional terminal-modified elastomer according to this embodiment can be obtained by a production method described later.
  • Weight average molecular weight (Mw) The polyfunctional end-modified elastomer according to the present embodiment preferably has a weight average molecular weight of 100,000 to 3,000,000 in terms of being able to exhibit higher strength when blended in a rubber composition for tires. More preferably, it is 200,000 or more and 2,000,000 or less. In addition, in this invention, a weight average molecular weight can be measured by the method as described in the Example mentioned later.
  • the dispersion (Mw / Mn) can be 1 or more and 3 or less in that it is an anionic polymerization method using an initiator having a plurality of polymerization initiation points. It is preferable that it is 1 or more and 2 or less.
  • examples of the monovalent organic group represented by R 1 and R 2 include a linear, branched, or cyclic alkyl group, and the alkyl group A part of carbon atoms constituting may be substituted with nitrogen, sulfur, oxygen or the like.
  • the alkyl group is preferably an alkyl group having 1 to 10 carbon atoms. Examples of the alkyl group having 1 to 10 carbon atoms include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, pentyl, hexyl, heptyl, octyl, and nonyl.
  • R 1 and R 2 are preferably alkyl groups having 1 to 4 carbon atoms.
  • the halogen atom represented by R 2 is, for example, a chlorine atom, a bromine atom, a fluorine atom, or an iodine atom, and among these, a chlorine atom or a bromine atom is preferable.
  • Examples of the alkoxy metal group having 1 to 10 carbon atoms contained at the end of the copolymer include a methoxy group, an ethoxy group, an n-propoxy group, an isopropoxy group, an n-butoxy group, and a t-butoxy group.
  • examples of the alkoxy metal group include: And atom number of 1 to 10 alkoxy metal group, preferably a Si or Ti is a group attached, also carbon atom number in the alkoxy metal base is preferably 1 to 4.
  • a method for producing a polyfunctional end-modified elastomer according to the present embodiment (hereinafter, also simply referred to as “production method”) comprises a polyfunctional aromatic vinyl compound and an organic alkali metal compound.
  • a polyfunctional end-modified elastomer which is a copolymer having a weight average molecular weight of 10000 or more and 3 million or less by reacting the compound or an alcohol having 1 to 10 carbon atoms.
  • a copolymer can be obtained by copolymerizing a conjugated diene compound and a monofunctional aromatic vinyl compound by an anionic polymerization method using the initiator.
  • R 1 , R 2 and X are respectively synonymous with R 1 , R 2 and X in the formula (1), a represents an integer of 0 or more and 4 or less, and b is 0 or more and 4 The following integers are represented (where a + b is an integer of 2 or more and 4 or less).
  • Step of preparing initiator In the manufacturing method according to the present embodiment, in the step of preparing the initiator, the polyfunctional aromatic vinyl compound and the organic alkali metal compound are converted into the polyfunctional aromatic vinyl compound / the organic alkali metal.
  • An organic alkali metal compound is allowed to act on a plurality of vinyl groups contained in a polyfunctional aromatic vinyl compound by preparing an initiator obtained by using a compound (molar ratio) of 0.2 to 0.9. Can do.
  • the polyfunctional aromatic vinyl compound / the organic compound can be more reliably caused to act on the plurality of vinyl groups contained in the polyfunctional aromatic vinyl compound.
  • the alkali metal compound (molar ratio) is preferably 0.8 or less, and more preferably 0.7 or less.
  • the ratio of the polyfunctional aromatic vinyl compound in the monomer used in preparing the initiator is preferably 20% by mass or more in that a star-shaped copolymer can be obtained. More preferably, it is at least mass% (usually 100 mass% or less).
  • polyfunctional aromatic vinyl compound can be, for example, a compound represented by the following formula (2).
  • R 3 and R 4 are the same or different and are a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an aryl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, or a silyloxy group Represents.
  • Examples of the alkyl group represented by R 3 and R 4 include the groups exemplified as R 1 and R 2 in the general formula (1), and the aryl group represented by R 3 and R 4 includes Examples include a phenyl group, a tolyl group, a xylyl group, a naphthyl group, and a biphenyl group.
  • Examples of the alkoxy group represented by R 3 and R 4 include a methoxy group, an ethoxy group, an n-propoxy group, and an isopropoxy group.
  • N-butoxy group for example, N-butoxy group, t-butoxy group, cycloalkoxy group (for example, cycloalkoxy group having a cycloalkyl group having 5 to 8 carbon atoms), aryloxy group (for example, phenoxy group, benzyloxy group, etc.
  • cycloalkoxy group for example, cycloalkoxy group having a cycloalkyl group having 5 to 8 carbon atoms
  • aryloxy group for example, phenoxy group, benzyloxy group, etc.
  • R 3 and R 4 include trimethylsilyloxy Si group, triethylsilyloxy group, triisopropylsilyloxy group, diethylisopropylsilyloxy group, t-butyldimethylsilyloxy group, t-butyldiphenylsilyloxy group, tribenzylsilyloxy group, triphenylsilyloxy group, tri-phenyl group A p-xylylsilyloxy group may be mentioned.
  • examples of the polyfunctional aromatic vinyl compound include 1,2-divinylbenzene, 1,3-divinylbenzene, 1,4-divinylbenzene, 1,2-diisopropenylbenzene, 1, 3-diisopropenylbenzene, 1,4-diisopropenylbenzene, 1,2-diisobutenylbenzene, 1,3-diisobutenylbenzene, 1,4-diisobutenylbenzene, 1,3-phenylenebis (1-vinyl Benzene), 1,4-phenylenebis (1-vinylbenzene), 1,1′-methylenebis (2-vinylbenzene), 1,1′-methylenebis (3-vinylbenzene), 1,1′-methylenebis (4 -Vinylbenzene), etc., and one of these may be used alone, or two or more may be used in combination.
  • polyfunctional aromatic vinyl compounds include disubstituted benzenes such as 1,2-divinylbenzene, 1,3-divinylbenzene, 1,4-divinylbenzene, 1,3-diisopropenylbenzene. 1,3-phenylenebis (1-vinylbenzene), or a mixture containing two or more of these is preferable, and a disubstituted mixture of divinylbenzene is more preferable.
  • Organic alkali metal compound examples include organic alkali metal compounds containing an alkali metal such as lithium, sodium, potassium, rubidium, and cesium. Of these, organolithium compounds are preferred.
  • organic lithium compound examples include, for example, ethyl lithium, n-propyl lithium, isopropyl lithium, n-butyl lithium, sec-butyl lithium, t-octyl lithium, n-decyl lithium, phenyl lithium, 2-naphthyl lithium, Examples include 2-butyl-phenyllithium, 4-phenyl-butyllithium, cyclohexyllithium, 4-cyclopentyllithium, 1,4-dilithiobutene-2, etc., and one of these may be used alone Alternatively, two or more kinds may be used in combination.
  • the organic alkali metal compound is more preferably n-BuLi, sec-BuLi, or tert-BuLi, and is n-BuLi in that it is more excellent in reactivity with the polyfunctional aromatic vinyl compound. More preferably.
  • the temperature at which the initiator is prepared is preferably 0 ° C. or higher, more preferably 20 ° C. or higher and 100 ° C. or lower, and further preferably 30 ° C. or higher and 85 ° C. or lower from the viewpoint of productivity.
  • Step of obtaining a copolymer In the production method according to this embodiment, after the step of preparing the initiator, a conjugated diene compound and a monofunctional aromatic vinyl compound are copolymerized in the presence of the initiator. And a step of obtaining a copolymer. In addition, the process of obtaining this copolymer can be performed in the same system continuously with the process of preparing the said initiator.
  • conjugated diene compounds examples include 1,3-butadiene, isoprene, 2,3-dimethyl-1,3-butadiene, 1,3-pentadiene, 3-methyl-1,3-pentadiene, 1,3 -Heptadiene, 1,3-hexadiene, etc., and one of these may be used alone, or two or more may be used in combination. Among these, at least one selected from 1,3-butadiene, 1,3-pentadiene, and isoprene or a combination thereof is preferable.
  • Monofunctional aromatic vinyl compound examples include styrene, p-methylstyrene, ⁇ -methylstyrene, vinylethylbenzene, vinylxylene, vinylnaphthalene, and the like. They may be used alone or in combination of two or more. Of these, styrene and / or ⁇ -methylstyrene are preferred.
  • solvent used in the production method according to the present embodiment examples include aliphatic hydrocarbons such as butane, pentane, hexane, and heptane, alicyclic hydrocarbons such as cyclopentane and cyclohexane, benzene, toluene, and xylene.
  • hydrocarbon solvents such as aromatic hydrocarbons.
  • the temperature at the time of copolymerization is preferably 0 ° C. or higher, more preferably 20 ° C. or higher and 100 ° C. or lower, and further preferably 30 ° C. or higher and 85 ° C. or lower from the viewpoint of productivity.
  • Step of obtaining a polyfunctional terminal-modified elastomer includes a compound represented by the above general formula (3) or carbon at the end of the copolymer obtained in the step of obtaining the copolymer. And reacting an alcohol having 1 to 10 atoms to obtain a polyfunctional end-modified elastomer which is a copolymer having a weight average molecular weight of 10000 to 3 million.
  • the compound represented by the general formula (3) or the alcohol having 1 to 10 carbon atoms can also function as a polymerization terminator.
  • Examples of the compound represented by the general formula (3) include metal chlorides (zinc chloride, tetrachlorotitanium, tetrachlorosilane, aluminum chloride (III), tin chloride (IV), etc.), metal alkoxides (tetramethoxytitanium).
  • Examples of the alcohol having 1 to 10 carbon atoms include methanol, ethanol, n-propanol, isopropanol, n-butanol, tert-butanol, n-pentanol, n-hexanol, n-heptanol, and n-octanol. Of these, alcohols having 1 to 4 carbon atoms are preferred in terms of better reactivity with the copolymer.
  • a tire rubber composition according to an embodiment of the present invention includes the polyfunctional end-modified elastomer according to the above embodiment.
  • the content of the polyfunctional terminal-modified elastomer according to the above embodiment is usually 5% by mass or more and 90% by mass or less.
  • the rubber composition for tires according to the present embodiment includes tire rubbers such as vulcanization or crosslinking agents, vulcanization accelerators, anti-aging agents, plasticizers, processing aids, liquid polymers, terpene resins, and thermosetting resins.
  • Various additives generally used in the composition can be blended within a range not impairing the object of the present invention, and such additives are kneaded by a general method to form a rubber composition, vulcanized or Can be used to crosslink. As long as the amount of these additives is not contrary to the object of the present invention, a conventional general amount can be used.
  • the rubber composition for tires according to the present embodiment can be produced by mixing the above components using a normal rubber kneading machine, for example, a Banbury mixer, a kneader, a roll, or the like.
  • the rubber composition for tires concerning this embodiment can contain silica.
  • the content of silica in the tire rubber composition according to this embodiment is usually 5% by mass or more and 150% by mass or less.
  • the rubber composition for tires according to this embodiment may contain a silane coupling agent.
  • the rubber composition for tires according to the present embodiment includes, for example, a covering rubber for cords such as a cap tread portion, an under tread portion, a sidewall portion, a bead filler portion, and a carcass layer, a belt layer, and a belt cover layer of a pneumatic tire.
  • a covering rubber for cords such as a cap tread portion, an under tread portion, a sidewall portion, a bead filler portion, and a carcass layer, a belt layer, and a belt cover layer of a pneumatic tire.
  • members such as a side reinforcing rubber layer having a crescent-shaped cross section in a run-flat tire, a rim cushion portion, etc., and in particular, it can be suitably used as a rubber composition for a pneumatic tire for automobiles.
  • the rubber composition for tires according to this embodiment includes the polyfunctional terminal-modified elastomer according to the above-described embodiment having excellent affinity with silica, when the rubber composition contains silica, The dispersibility of the silica is good. Therefore, by using the tire rubber composition, it is possible to manufacture a tire in which both reduction of rolling resistance and stability on a wet road surface are achieved.
  • Synthesis example 4.1 Synthesis of H-terminated poly (styrene-butadiene) copolymer (1) In a 10 L autoclave, cyclohexane (manufactured by Kanto Chemical Co., Ltd .: 4.37 kg), tetramethylethylenediamine (TMEDA, manufactured by Aldrich: 0.858 g, 0.00738 mol), Styrene (Kanto Chemical Co., Inc .: 300 g, 2.88 mol) and butadiene (Takachiho Chemical Co., Ltd .: 721 g, 13.3 mol) were added and heated to 50 ° C.
  • TMEDA tetramethylethylenediamine
  • Styrene Kanto Chemical Co., Inc .: 300 g, 2.88 mol
  • butadiene Teakachiho Chemical Co., Ltd .: 721 g, 13.3 mol
  • the initiator used for polymerization was synthesized as follows. Cyclohexane (13 mL), divinylbenzene (divinylbenzene disubstituted mixture, manufactured by Wako Pure Chemical: 0.674 g, 0.00518 mol), 2,2-di (2-tetrahydrofuryl) propane (manufactured by TCI: 0.484 g, 0.00263 mol) and a hexane solution of n-BuLi (manufactured by Kanto Chemical Co., Ltd .: 1.64 mol / L, 11 mL, 0.0180 mol) were added at room temperature and stirred for 1 hour.
  • the initiator used for polymerization was synthesized as follows. Cyclohexane (13 mL), divinylbenzene (Wako Pure Chemicals: 0.665 g, 0.00516 mol), 2,2-di (2-tetrahydrofuryl) propane (TCI: 0.558 g, 0.00303 mol) and n-BuLi A hexane solution (manufactured by Kanto Chemical Co., Ltd .: 1.64 mol / L, 11 mL, 0.0180 mol) was added at room temperature and stirred for 1 hour.
  • the initiator used for polymerization was synthesized as follows. Cyclohexane (13 mL), divinylbenzene (manufactured by Wako Pure Chemical: 0.652 g, 0.00501 mol), 2,2-di (2-tetrahydrofuryl) propane (manufactured by TCI: 0.554 g, 0.00306 mol) and n-BuLi A hexane solution (manufactured by Kanto Chemical Co., Ltd .: 1.64 mol / L, 11 mL, 0.0180 mol) was added at room temperature and stirred for 1 hour.
  • the initiator used for polymerization was synthesized as follows. Cyclohexane (13 mL), divinylbenzene (manufactured by Wako Pure Chemical: 0.670 g, 0.00514 mol), 2,2-di (2-tetrahydrofuryl) propane (manufactured by TCI: 0.567 g, 0.00308 mol) and n-BuLi A hexane solution (manufactured by Kanto Chemical Co., Ltd .: 1.64 mol / L, 11 mL, 0.0180 mol) was added at room temperature and stirred for 1 hour.
  • the initiator used for polymerization was synthesized as follows. Cyclohexane (13 mL), divinylbenzene (0.659 g, 0.00506 mol), 2,2-di (2-tetrahydrofuryl) propane (0.554 g, 0.00301 mol) and n-BuLi in hexane (Kanto Chemical Co., Inc .: 1.64 mol / L, 11 mL, 0.0180 mol) was added at room temperature and stirred for 1 hour.
  • a / B represents the polyfunctional aromatic vinyl compound / organic alkali metal compound (molar ratio) used in Synthesis Examples 1 to 6.
  • the polymers of Synthesis Examples 1 to 6 are polyfunctional terminal-modified elastomers that are copolymers of conjugated diene compounds and monofunctional aromatic vinyl compounds, Using an initiator obtained by using a polyfunctional aromatic vinyl compound and an organic alkali metal compound at the polyfunctional aromatic vinyl compound / the organic alkali metal compound (molar ratio) of 0.2 or more and 0.9 or less A copolymer obtained by copolymerizing the conjugated diene compound and the monofunctional aromatic vinyl compound, having a weight average molecular weight of 10,000 to 3,000,000, and a terminal of the copolymer
  • an alkoxy metal group having 1 to 10 carbon atoms, or a hydrogen atom it has excellent affinity with silica and has sufficient tensile strength. And tensile elongation can be seen that have a.
  • the multifunctional terminal-modified elastomer of the present invention is excellent in affinity with silica, a tire that achieves both reduction of rolling resistance and stability on a wet road surface by blending with a rubber composition for tires. Can be manufactured.

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Abstract

L'invention concerne : un élastomère polyfonctionnel à terminaison modifiée présentant une affinité remarquable pour la silice ; un procédé pour sa fabrication ; et une composition de caoutchouc pour pneu. Cet élastomère polyfonctionnel à terminaison modifiée est un copolymère d'un composé de diène conjugué et d'un composé aromatique de vinyle monofonctionnel, contient un copolymère obtenu par copolymérisation du composé de diène conjugué et du composé aromatique de vinyle monofonctionnel à l'aide d'un initiateur obtenu à partir d'un composé aromatique de vinyle polyfonctionnel et d'un composé organique de métal alcalin à un rapport molaire de 0,2-0,9 en tant que rapport de composé aromatique de vinyle polyfonctionnel à composé organique de métal alcalin, la masse moléculaire pondérale moyenne est de 1000 à 3.000.000 et la terminaison du copolymère présente un groupe représenté par la formule générale (1), un groupe métallique alcoxy comprenant 1-10 atomes de carbone ou un atome d'hydrogène.
PCT/JP2015/083117 2014-11-25 2015-11-25 Élastomère polyfonctionnel à terminaison modifiée, son procédé de production et composition de caoutchouc pour pneu Ceased WO2016084863A1 (fr)

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CN108017757A (zh) * 2017-12-26 2018-05-11 甘肃农业大学 硅烷偶联剂改性链中官能化溶聚丁苯橡胶及其合成方法

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