Abstract: The disclosure relates to rubber latex formed from any of: branched block copolymers derived from alkenyl aromatic hydrocarbon—1,3-diene monomer system, and branched polyisoprene homopolymers derived from isoprene. The polymers in embodiments are obtained by polymerization in the presence of an anionic initiator; at a temperature from 0° C. to 100° C.; followed by coupling with a multifunctional coupling agent of formula (R1O)3Si—Y—Si(OR2)3, wherein R1 and R2 are independently C1-C6 alkyl groups; and Y is a C2-C8 alkylene group. The polymers are obtained as rubber cements having high solids content and low zero shear viscosities. The rubber cements are valuable for making latices for further applications.

Abstract: Provided herein are thioacetate isobutylene-based polymer compositions comprising thioalkylated functionalized polymer, and a sulfur donor and/or accelerator cure system. The thioalkylated functionalized polymer is produced via nucleophilic substitution reaction in solution. The present thioacetate functionalized isobutylene-based polymer compositions together with various accelerators and sulfur donors can form thermosets useful for pharmaceutical and tire applications without the use of zinc or a zinc oxide activator.

Abstract: Vulcanizates with desirable properties such as reduced hysteresis and improved wear resistance can be obtained from a composition that includes particulate filler(s) and at least two types of terminally functionalized polymers. One type of polymer has a heterocyclic moiety at a terminus, while another type has at one of its termini an aryl group that includes at least two hydroxyl substituents. The functionalized polymers are provided by reacting terminally active polymers with, respectively, a heterocyclic nitrile and a compound that includes an aryl group having at least two directly bonded OGp substituents, where Gp is a protecting group, and a substituent that can react with the active terminus. The protecting groups can be removed so as to provide a terminal moiety that includes an aryl group having at least two directly bonded hydroxyl groups.

Abstract: Provided are polystyrene sulfonate analogs and methods of making polystyrene sulfonate analogs. The polystyrene sulfonate analogs may be formed by a ring opening metathesis polymerization (ROMP). The ROMP may provide analogs having a precise periodicity. The polystyrene sulfonate analogs may have a relatively low glass transition temperature.

Abstract: A polarizing plate includes a polarizer, a bonding layer on an upper surface of the polarizer, a protective film on an upper surface of the bonding layer and having a moisture transmittance of about 30 g/m2·24 hr or less at 40° C. and 90 % relative humidity (RH), and a barrier layer on a lower surface of the polarizer and formed of a barrier layer composition including an alicyclic epoxy resin having a glass transition temperature of about 200° C. or more. The polarizing plate may have a light transmittance variation rate of 3% or less, as calculated by Equation 1: Light transmittance variation rate=|T0?T500|/T0×100??(1), where T0 is an initial light transmittance and T500 is a light transmittance after 500 hours as set forth herein.

Abstract: The invention relates to a process for the preparation of a particulate polyethylene product in a loop reactor, wherein the polymerization catalyst applied in the polymerization process comprises a particulate metallocene-alumoxane catalyst immobilized on a porous silica support; and whereby said metallocene-alumoxane catalyst is heterogeneously distributed on said porous silica support.

Abstract: The present invention discloses a method for partially hydrogenating polymer. The method comprises providing a polymer having at least one vinyl aromatic block; and hydrogenating the polymer in presence of a heterogeneous catalyst on a support selected from the group consisting of BaSO4, Al2O3, TiO2, ZrO2, active carbon and any combination thereof to obtain a hydrogenated polymer. The hydrogenated polymer comprises at least one hydrogenated vinyl aromatic block having a carbon ring linking with a backbone of the hydrogenated polymer, wherein the average weight percent of the hydrogenated vinyl aromatic block(s) having only one and two double bonds on the carbon ring is between 1-30 wt % based on the total weight of the hydrogenated polymer.

Abstract: The present invention is directed to a functionalized elastomer comprising the reaction product of a living anionic elastomeric polymer and a polymerization terminator of formula I wherein R1 is C1 to C4 linear alkyl, or C1 to C4 branched alkanediyl; X1, X2, X3 are independently O, S, or a group of formula (II) or (III) where R2 is C1 to C18 linear or branched alkyl; Z is R3, —OR4, or —R5—X4; R3, R4 are independently C1 to C18 linear or branched alkyl; R5 is C1 to C18 alkanediyl or dialkyl ether diyl; X4 is halogen or a group of structure IV, V, VI, VII or VIII wherein R6, R7, R8, R9, and R10 are independently H or C1 to C8 alkyl; R11 is C2 to C8 alkanediyl; R12 and R13 are independently H, aryl or C1 to C8 alkyl; Q is N or a group of structure IX wherein R14 is C1 to C8 alkyl.

Abstract: The present invention includes a process for producing treated filler that includes (a) treating a slurry that includes untreated filler where the untreated filler has not been previously dried, with a treating composition that includes a treating agent, thereby forming a treated filler slurry, and (b) drying the treated filler slurry to produce treated filler. The treating agent can include a polymer having (i) at least one first group that interacts with the untreated filler and (ii) at least one second group that interacts with a rubber matrix into which the treated filler is incorporated. The present invention also is directed to treated filler prepared by the process, as well as rubber compounding compositions and tires including the treated filler.

Abstract: Embodiments provide polydienes and diene copolymers having organophosphines functionality. Specific embodiments employ phosphorus-containing organometal initiators and copolymers prepared by anionically polymerizing conjugated diene monomer and vinyl organophosphine.

Abstract: The present invention relates to diene polymers, wherein the diene polymers have, at the start of the polymer chains, tertiary amino groups of the formula (I) or (II) where R1, R2 are the same or different and are each alkyl, cycloalkyl, aryl, alkaryl and aralkyl radicals which may contain heteroatoms such as O, N, S and/or Si, Z is a divalent organic radical which, as well as C and H, may contain heteroatoms such as O, N, S and/or Si, and, at the end of the polymer chains, silane-containing carbinol groups of the formula (III) or metal salts thereof or semimetal salts thereof, where R3, R4, R5, R6 are the same or different and are each an H or alkyl, cycloalkyl, aryl, alkaryl and aralkyl radicals which may contain heteroatoms such as O, N, S and/or Si, A is a divalent organic radical which, as well as C and H, may contain heteroatoms such as O, N, S and/or Si.

Abstract: The present invention provides a functional diene polymer, a preparation method thereof and a rubber composition comprising the functional diene polymer. The functional diene polymer comprises at least one type of conjugated diene structural units and silane coupler functional units represented by formula (I) in its molecular chain, and the number-average molecular weight of the functional diene polymer is 50,000˜1,000,000; R1-R4 are C1-C20 linear or branched alkyl or heteroatom-containing C1-C20 linear or branched alkyl, and the heteroatom is selected from one or more of halogen, oxygen, sulfur, silicon, and phosphorus. Not only the relationship between the wet slip resistance and the rolling resistance of the functional diene polymer is effectively improved, but also the offensive odor produced in the rubber mixing process owing to the addition of the silane coupler is reduced.

Abstract: Disclosed herein are metallated aminosilane compounds for use as functional initiators in anionic polymerizations and processes for producing an aminosilane-functionalized polymer using the metallated aminosilane compounds to initiate anionic polymerization of at least one type of anionically polymerizable monomer. Preferred use of the metallated aminosilane compounds results in rubber compositions for use in tires comprising an aminosilane functionalized polymer. A telechelic polymer may result from use of the metallated aminosilane compound and a functional terminator.

Abstract: The present invention is directed to a functionalized elastomer comprising the reaction product of a living anionic elastomeric polymer and a polymerization terminator of formula I wherein R1, R2, R3, R4, and R5 are as defined. The invention is further directed to a rubber composition including the functionalized elastomer, and a pneumatic tire including the rubber composition.

Abstract: A method for hydrogenating a polymer containing vinyl aromatic block and the hydrogenated polymer are provided. The method includes providing a polymer having at least one vinyl aromatic block; and hydrogenating the polymer in presence of a heterogeneous catalyst on a support, wherein the heterogeneous catalyst consists essentially of Ru, Zn and B, or Ru, Zn and P.

Abstract: An elastomeric polymer composition formed from a reaction product of a living anionic elastomeric polymer and sulfur containing chain end modifier with the general formula: (RO)x(R)ySi—R?—S—Z wherein O is oxygen, x is an integer selected from 1, 2 and 3; y is an integer selected from 0, 1, and 2; x+y=3, R is the same or different and is: (C1-C16) alkyl; R? is an aryl, an alkylaryl, a (C7-C16) alkyl aryl, or a (C1-C16) alkyl which may be linear or branched, saturated or unsaturated and may be substituted with: (C1-C4) alkyl, (C1-C4) alkoxy, (C7-C16) aryl, (C7-C16) aralkyl, nitrile, amine, NO2, thioalkyl; and Z is a protective group. Methods are described for making the elastomeric polymer composition, their use in preparing vulcanized elastomeric compositions, and articles made from such compositions, including pneumatic tires, tire treads, belts, and the like.

Abstract: A process for the continuous preparation of modified elastomeric polymers includes (i) providing and polymerizing at least one conjugated diene monomer and, optionally, one or more aromatic vinyl monomer in the presence of an anionic initiator and a compound according to Formula I, e.g. 2,2-di-(2-oxolanyl)propane or a derivative thereof, to provide a living anionic polymer; and (ii) adding a “sulfanylsilane” compound to the living anionic polymer. Elastomeric polymers obtainable according to the above process and compositions including the elastomeric polymer and, optionally, further constituents such as oil, filler and/or vulcanizing agent are described. A process for the preparation of a cross-linked elastomeric polymer that includes adding a vulcanizing agent to the elastomeric polymer, as well as articles and compositions that include the elastomeric polymer, the cross-linked elastomeric polymer or both are described.

Abstract: A method for preparing a functionalized polymer, the method comprising the step of reacting a reactive polymer with a functionalizing agent defined by formula I or formula II: or combinations thereof, where R1, R2, and R3 are each independently a divalent organic group, R4 and R5 are each independently a monovalent organic group, a is an integer from 0 to 1, x is an integer from 0 to 2, y is an integer from 1 to 3, x+y=3, and ? is a protected amino group.

Abstract: The present invention is directed to a self-healing rubber composition comprising a functionalized elastomer comprising: a polymeric backbone chain derived from a monomer comprising at least one conjugated diene monomer and optionally at least one vinyl aromatic monomer; and a functional group bonded to the backbone chain, the functional group comprising a multidentate ligand capable of complexing with a metal ion; and a partitioned metal ion. The invention is further directed to a pneumatic tire comprising the self-healing rubber composition.

Abstract: The invention relates to an elastomer material including flexible polymer chains containing crosslinking bridges having covalent bonds and crosslinking bridges having noncovalent bonds. The invention also relates to a method for preparing such elastomer material.

Abstract: Disclosed are a modified conjugated diene polymer and a method for preparing the same. Provided are advantageously a modified conjugated diene polymer and a method for preparing the same which provide superior compatibility with an inorganic filler, heat generation, tensile strength and abrasion resistance, low fuel consumption and excellent resistance on wet roads.

Abstract: For a tire excellent in strength, low-heat buildup property, wet grip property, and driveability, and a rubber composition and a conjugated diene rubber for the tire, a conjugated diene rubber of the present invention includes 5 wt % or more of a structure that 3 or more conjugated diene polymer chains are bound via a denaturing agent, obtained by reaction of each chain and the agent, each chain being that at least one of terminals is an isoprene block having 70 wt % or more of an isoprene monomer unit, and the other is an active terminal, the agent having, per molecule, at least one of an epoxy group(s) and a hydrocarbyloxysilyl group(s), and being that a total number of the epoxy group(s) and hydrocarbyloxy groups in the hydrocarbyloxysilyl group(s) per molecule is 3 or more.

Abstract: A rubber composition that can be used in applications such as automotive tires and can improve the fuel efficiency performance and driving stability of automobiles and the like, a method for producing a rubber composition, and a tire using the same are provided.

Abstract: Provided are an electrode binder for a secondary battery including an amine-based compound expressed by Chemical Formula 1 below and water-based binder particles including at least one carboxyl group as an end group, a method of preparing the same, and an electrode for a secondary battery including the electrode binder for a secondary battery

Abstract: There is provided a hydrogenated branched conjugated diene copolymer prepared by copolymerizing 1 to 99% by weight of a branched conjugated diene compound (1): wherein R1 is an aliphatic hydrocarbon having 6 to 11 carbon atoms, 99 to 0% by weight of a conjugated diene compound (2): wherein R2 and R3 are the same or different and each is a hydrogen atom, an aliphatic hydrocarbon group having 1 to 3 carbon atoms or a halogen atom, and/or 99 to 0% by weight of a vinyl compound (3): wherein R4 is a hydrogen atom, an aliphatic hydrocarbon group having 1 to 3 carbon atoms, an alicyclic hydrocarbon group having 3 to 8 carbon atoms, or an aromatic hydrocarbon group having 6 to 10 carbon atoms, and then hydrogenating the resulting copolymer.

Abstract: The present invention relates to a branched conjugated diene copolymer which is useful for preparing a rubber composition, having high uniformity of a temperature dependence curve of a viscoelasticity tan ?, for a tire, a rubber composition comprising the copolymer, and a pneumatic tire produced using the rubber composition for a tire. The branched conjugated diene copolymer is composed of monomer components comprising a branched conjugated diene compound represented by a general formula (1): wherein R1 represents an aliphatic hydrocarbon group having 6 to 11 carbon atoms, and an aromatic vinyl compound represented by a general formula (2): wherein R2 represents an aromatic hydrocarbon group having 6 to 10 carbon atoms, and R5 represents a hydrogen atom or the like, and a copolymerization ratio (m) of the aromatic vinyl compound (2) is 45% by mass or more.

Abstract: A conjugated diene rubber of the present invention is prepared from conjugated diene polymer chains, wherein the conjugated diene polymer chains each has an active end at one end and an isoprene block at least at the other end, the isoprene block contains 70 wt % or more isoprene monomer units, and the active ends of at least part of the conjugated diene polymer chains are modified with a compound having a >C?O group as a functional group. This provides (i) a tire that has an excellent strength, excellent low-heat buildup property, and excellent wet grip property and (ii) a rubber composition and a conjugated diene rubber that are suitably used to produce the tire.

Abstract: The present invention discloses a method for producing an epoxidized polymer. The method comprises the steps of: (1) providing a polymer solution containing a polymer having a conjugated diene group; (2) providing a catalyst solution dissolved in the polymer solution, the catalyst solution containing a transition metal ion and a ligand for bonding to the transition metal ion, the transition metal ion being selected from the group consisting of Ti, Mn, V, Mo, W and any combination thereof; and (3) epoxidizing double bonds of the conjugated diene group to produce the epoxidized polymer by providing an epoxidizing agent dissolved in the polymer solution containing the catalyst solution, wherein the epoxidizing agent is meta-chloroperoxybenzoic acid (mCPBA) or analogs thereof.

Abstract: The present invention relates to a branched conjugated diene copolymer which is useful for preparing a rubber composition, having high uniformity of a temperature dependence curve of a viscoelasticity tan ?, for a tire, a rubber composition comprising the copolymer, and a pneumatic tire produced using the rubber composition for a tire. The branched conjugated diene copolymer is composed of monomer components comprising a branched conjugated diene compound represented by a general formula (1): wherein R1 represents an aliphatic hydrocarbon group having 6 to 11 carbon atoms, and an aromatic vinyl compound represented by a general formula (2): wherein R2 represents an aromatic hydrocarbon group having 6 to 10 carbon atoms, and R5 represents a hydrogen atom or the like, and a copolymerization ratio (m) of the aromatic vinyl compound (2) is 45% by mass or more.

Abstract: A method of production of modified conjugated diene-based rubber comprising a steps of using, as a polymerization initiator, an alkali metalated aromatic compound which has three or more carbon atoms which are directly bonded to alkali metal atoms and aromatic rings in one molecule so as to polymerize a monomer which contains at least a conjugated diene compound and reacting a compound of the following general formula (I) with an active ends of the obtained polymer is provided. (In the general formula (I), any one of R1 and R10 to R18 is an atom or reactive group which can react with the active ends of said polymer or a hydrocarbon group which includes either of the same, the remaining among R1 and R10 to R18 and R2 to R9 are respectively independently a hydrogen atom, alkyl group, or aryl group, and “j”, “k”, “m”, and “n” are integers of 0 to 100.

Abstract: An object of the present invention is to provide a rubber composition for a tire, capable of achieving both good rolling resistance properties and good wear resistance in a sufficiently compatible manner when the rubber composition is applied to a component member of a tire. Specifically, the present invention provides a rubber composition comprising a rubber composition and hydrated silica, wherein “CTAB” (m2/g) as specific surface area by cetyltrimethylammonium bromide adsorption and “IB” as ink bottle-shaped micropore index, of the hydrated silica, satisfy a specific relationship and “weight loss on ignition” as weight loss when the hydrate silicate is heated at 750° C. for 3 hours and “weight loss on heating” as weight loss when the hydrate silicate is heated at 105° C. for 2 hours satisfy a specific relationship.

Abstract: A process for preparing graft polymers from a polymer is based on conjugated diene units and a graft which is a thiol derivative. The process has an absence of solvent and any radical initiator. The graft polymer can be advantageously be used as additive for a bitumen/polymer composition and in particular permits thermoreversible cross-linking.

Abstract: A process for making a radial multi-block copolymer, comprising: (a) anionically polymerizing styrene monomer A1, at least one monovinylarene monomer A2 other than styrene and at least one conjugated diene monomer B using a lithium-based initiator to form block copolymer chains; (b) adding a metal alkyl compound other than the lithium-based initiator after initiating anionic polymerization in step (a), wherein the molar ratio of the metal alkyl compound to lithium is greater than about 2.0; and (c) adding a coupling agent having more than two functional groups to form the radial multi-block copolymer, wherein the radial multi-block copolymer comprises a residue Z derived from the coupling agent and block copolymer chains from step (b) coupled to the residue Z.

Abstract: Disclosed are a modified conjugated diene-based polymer capable of providing a polymer composition improved in tan ? balance, a polymer composition containing the modified conjugated diene-based polymer and silica, and a process for producing the modified conjugated diene-based polymer. The modified conjugated diene-based polymer is obtained by melt-kneading a conjugated diene-based polymer and 0.01 to 2 parts by weight of a Bunte salt per 100 parts by weight of the conjugated diene-based polymer, in the presence of water whose amount is from 0.1 to 1,000 parts by weight per one part by weight of the Bunte salt.

Abstract: A thermoreversibly cross-linked graft polymer, which may be used in bituminous asphalt, includes: a main polymer chain P consisting of conjugated diene units; at least one side graft G having the following general formula (1): R—(OCH2CH2)m—S—, where R is a straight or branched saturated hydrocarbon chain having at least 18 carbon atoms, and m is an integer varying from 0 to 20, the graft G being connected to the main polymer chain P via the sulfur atom of formula (1); and at least one graft G? having the following general formula (4): —S—R?—S—, where R? is a linear or branched, saturated or unsaturated hydrocarbon grouping having from 2 to 40 carbon atoms, optionally including one or more heteroatoms, the graft G? being connected to the main polymer chain P via each sulfur atom of formula (4).

Abstract: Vulcanizates with desirable properties can be obtained from compounds incorporating polymers that include hydroxyl group-containing aryl functionalities. The functionalities can be incorporated by using any or all of appropriate initiators, monomers and optional terminating compounds. Such polymers exhibit excellent interactivity with both conventional and non-conventional fillers.

Abstract: There is disclosed a functionalized elastomer comprising the reaction product of a living anionic elastomeric polymer; and a polymerization terminator of formula I where R1, R2 and R3 are independently C1 to C8 alkyl or C1 to C8 alkoxy, with the proviso that at least two of R1, R2 and R3 are C1 to C8 alkoxy; R4 is C1 to C8 alkyl; Si is silicon; S is sulfur; and Z is R5 or of formula II where R5 is alkyl, aryl, alkylaryl or arylalkyl. There is further disclosed a rubber composition comprising the functionalized elastomer, and a pneumatic tire comprising the rubber composition.

Abstract: The invention provides a rubber composition comprising a styrene-butadiene copolymer and having improved compatibility with a thiol-based crosslinking agent and also having increased curability. As means for solving the problems, the inventive thiol-containing liquid rubber composition comprises (A) a styrene-butadiene copolymer which is liquid at 25° C. and (B) a polythiol derived from mercaptocarboxylic acid, wherein the styrene-butadiene copolymer (A) desirably has a bound styrene content of 20 to 90% by mass.

Abstract: A method for producing a conjugated diene polymer usable as a raw material of a crosslinked polymer which is used for use in tires of automobiles and can enhance low fuel consumption performance of automobiles is provided. A method for producing a modified conjugated diene polymer comprising a polymerization step in which monomer including a conjugated diene compound or monomer including a conjugated diene compound and an aromatic vinyl compound are polymerized in the presence of at least one compound selected from the group consisting of the following formulae (1) and (2) and an alkali metal compound or an alkaline earth metal compound to obtain a modified conjugated diene polymer. (In the formulae, A1 is a functional group which has a three-substituted hydrocarbylsilyl group; has at least one atom selected from the group consisting of N, P and S; has no active hydrogen and is bound to R1 by any one atom of the above N, P and S. R1 and R2 are hydrocarbylene groups.

Abstract: The present invention is directed to a functionalized elastomer comprising: a polymeric backbone chain derived from a monomer comprising at least one conjugated diene monomer and optionally at least one vinyl aromatic monomer; and a functional group bonded to the backbone chain, the functional group comprising a multidentate ligand capable of complexing with a metal ion.

Abstract: The present disclosure provides a polymer electrolyte membrane chemically bonded with an ionic liquid. More particularly, the present disclosure provides a polymer electrolyte membrane chemically bonded with an ionic liquid by reacting the ionic liquid with a novel polymer chain terminal. The polymer electrolyte membrane described herein has a high hydrogen ionic conductivity, even in a high-temperature and anhydrous environment. Additionally, the membrane displays electro-chemical and thermal stability. Moreover, the polymer electrolyte membrane may also be applied to a high-temperature and dry-out bio fuel cell.

Abstract: A method is provided for synthesizing a core-shell nanoparticle that includes the following steps: providing a polymeric seed (in a solvent) that includes a mono-vinyl monomer cross-linked with a cross-linking agent to form the core of the nanoparticle, the core has an average diameter of from about nanometers to about 10,000 nanometers, and the core has polymer chains with living ends; adding a stabilizer to stabilize the seed and prevent the seed from precipitating out of solution; and grafting a shell species onto the living ends of the core to form the shell of the nanoparticle. A core-first synthesized nanoparticle, along with a rubber composition and tire product are also provided.

Abstract: A method for preparing a functionalized polymer, the method comprising the steps of polymerizing monomer to form a reactive polymer, and reacting the reactive polymer with a polycyano compound.

Abstract: Disclosed is an oil-soluble lubricating oil additive composition, suitable for use as a dispersant viscosity index improver in lubricating oils; prepared by the process which comprises reacting a hydrocarbon polymer having a number average molecular weight (Mn) between about 7,000 and about 500,000 wherein the polymer backbone has been functionalized with an ethylenically unsaturated acylating agent and a hydroxyl-linked polycyclic fused ring component.

Abstract: Improved methods for preparing sulfonated block polymers with acyl sulfates in non-halogenated aliphatic solvents are provided. The methods include the sulfonation of a precursor block polymer with an acyl sulfate in a reaction mixture further comprising at least one non-halogenated aliphatic solvent to form a sulfonated block polymer, wherein the initial concentration of the precursor block polymer is in the range of from about 0.1 wt % to a concentration that is below the limiting concentration of the precursor block polymer based on the total weight of the reaction mixture. A sulfonation degree of greater than about 1.0 milliequivalent sulfonic acid per gram sulfonated block polymer can be achieved substantially free of polymer precipitation and free of disabling gelation.

Abstract: A modified polymer body 1 has a polymer body 2 composed of a polymer material containing a carbon-carbon double bond and first binding parts 3 and second binding parts 4 bound to the surface of the polymer body 2. The first binding parts 3 are such that an organic group 6 having a functional group is bound via an isocyanuric acid skeleton 5 to the surface of the polymer body 2. The second binding parts 4 are such that an organic group 7 having a functional group is directly bound to the surface of the polymer body 2 without interposing an isocyanuric acid skeleton 5.

Abstract: The present invention relates to a conjugated diene polymer end-modified with an alkoxysilane derivative. More particularly, the present invention relates to an end-modified conjugated diene polymer, wherein an alkoxysilane derivative having an ether group and a dialkylamino group is bonded as end modifier to an end of a conjugated diene polymer, which is useful as a rubber material for a tire tread owing to improved compatibility with an inorganic reinforcing agent and improves dynamic mechanical properties such as wet traction, rolling resistance, Mooney viscosity, processability, etc.

Abstract: There are provided a modified conjugated diene-based polymer having a good balance between the hysteresis loss properties and the wet skid resistance, practically sufficient abrasion resistance and fracture strength, and high processability when formed into a vulcanized product, and a modified conjugated diene-based polymer composition. A method for producing a modified conjugated diene-based polymer, comprising: a polymerization step of polymerizing a conjugated diene compound or copolymerizing a conjugated diene compound with an aromatic vinyl compound using an alkali metal compound or an alkaline earth metal compound as a polymerization initiator to obtain a conjugated diene-based polymer having a reactive end, and a modifying step of reacting a compound having a specific structure with the reactive end of the conjugated diene-based polymer.

Abstract: A method for producing a modified conjugated diene polymer usable as a raw material of a crosslinked polymer which is used for use in tires and the like of automobiles and can enhance low fuel consumption performance of automobiles and the like is provided. A method for producing a modified conjugated diene polymer comprising a polymerization step in which a monomer including a conjugated diene compound or a monomer including a conjugated diene compound and an aromatic vinyl compound is polymerized in the presence of at least one compound selected from the group consisting of the following formulae (1) and (2) and an alkali metal compound or an alkaline earth metal compound to obtain a modified conjugated diene polymer. (In the formulae, A1 is a hydrocarbylsilyl group in which three H's (hydrogen atoms) in a “—SiH3” structure are each substituted by a hydrocarbyl group, and R1 and R2 are hydrocarbylene groups.

Abstract: The invention provides a composition comprising an ethylene/?-olefin/non-conjugated diene interpolymer, which has the following properties: an Mz(abs)/Mz(Conv) value greater than 1.35; an Mz(BB)/Mw(abs) value greater than 1.6; and a non-conjugated diene content less than 10 weight percent, based on the total weight of the interpolymer.