Abstract: A vulcanizable composition comprising rubber component, a filler, and a curing agent, where the rubber component includes a block copolymer of polybutadiene and polyisoprene, and where the block copolymer has a cis content of at least 90%.

Abstract: Embodiments of the present disclosure are directed to functionalized copolymers produced by copolymerization of at least one conjugated diolefin monomer and at least one vinyl monomer, the functionalized copolymer comprising at least one functional group having silica reactive moieties, wherein the functionalized copolymer has a degree of hydrogenation of 75% to 98 mol % as measured using proton nuclear magnetic resonance spectroscopy (1H NMR).

Abstract: A vulcanizable composition comprising rubber component, a filler, and a curing agent, where the rubber component includes a block copolymer of polybutadiene and polyisoprene, and where the block copolymer has a cis content of at least 90%.

Abstract: A vulcanizable composition comprising rubber component, a filler, and a curing agent, where the rubber component includes a block copolymer of polybutadiene and polyisoprene, and where the block copolymer has a cis content of at least 90%.

Abstract: Embodiments of the present disclosure are directed to functionalized copolymers produced by copolymerization of at least one conjugated diolefin monomer and at least one vinyl monomer, the functionalized copolymer including at least one functional group having silica reactive moieties, wherein the functionalized copolymer has a degree of hydrogenation of 75% to 98 mol % as measured using proton nuclear magnetic resonance spectroscopy (1H NMR). In one or more embodiments, the silane modifier may include an oxygen-containing moiety, wherein the oxygen atom of the oxygen-containing moiety may not be directly bonded with the silicon atom.

Abstract: A method for preparing a functionalized polymer, the method comprising the steps of (i) polymerizing monomer to form a reactive polymer; and (ii) reacting the reactive polymer with a [poly(hydrocarbylene glycol) hydrocarbyl ether] (meth)acrylate.

Abstract: Disclosed herein are processes for preparing functionalized polymers, functionalizing compounds useful in the processes and processes for preparing the functionalizing compound. The processes for preparing a functionalized polymer include reaction of a functionalizing compound (prepared from the reaction of an alkoxysilane compound of formula (I) with a polyol of formula (II)) with a reactive conjugated diene monomer-containing polymer, thereby producing a polymer end functionalized with the functionalizing compound. In certain embodiments, the functionalizing compound has a formula according to formula (III), (IV), or (V).

Abstract: The present invention provides a tire rubber composition prepared by mixing at least one rubber component selected from natural rubbers and synthetic diene rubbers (A), a filler including an inorganic filler (B), a silane coupling agent (C) and a thiosemicarbazone derivative (D), and provides a production method for a tire rubber composition, wherein the tire rubber composition is kneaded in plural stages, and in the first stage of kneading, the rubber component (A), all or part of the inorganic filler (B), all or part of the silane coupling agent (C), and the thiosemicarbazone derivative (D) are kneaded, therefore providing a tire rubber composition having improved reactivity between the coupling agent and the rubber component and excellent in low-heat-generation property and a production method for the composition.

Abstract: A vulcanizable composition comprising rubber component, a filler, and a curing agent, where the rubber component includes a block copolymer of polybutadiene and polyisoprene, and where the block copolymer has a cis content of at least 90%.

Abstract: The invention provides a rubber composition prepared by mixing, per 100 parts by mass of a rubber component comprising at least 50% by mass of a diene-based rubber, from 20 to 150 parts by mass of a filler, and from 0.05 to 30 parts by mass of a compound A which has a specific guanidine structure and has a functional group reactive with the diene-based rubber. The rubber composition improves both a high elastic modulus and a low tan ?. The invention also provides a pneumatic tire using the rubber composition.

Abstract: The invention provides a rubber composition prepared by mixing, per 100 parts by mass of a rubber component comprising at least 50% by mass of a diene-based rubber, from 20 to 150 parts by mass of a filler, and from 0.05 to 30 parts by mass of a compound A which has a specific guanidine structure and has a functional group reactive with the diene-based rubber. The rubber composition improves both a high elastic modulus and a low tan ?. The invention also provides a pneumatic tire using the rubber composition.

Abstract: Disclosed herein are processes for preparing functionalized polymers, functionalizing compounds useful in the processes and processes for preparing the functionalizing compound. The processes for preparing a functionalized polymer include reaction of a functionalizing compound (prepared from the reaction of an alkoxysilane compound of formula (I) with a polyol of formula (II)) with a reactive conjugated diene monomer-containing polymer, thereby producing a polymer end functionalized with the functionalizing compound. In certain embodiments, the functionalizing compound has a formula according to formula (III), (IV), or (V).

Abstract: The present invention relates to a method for producing a rubber composition obtained by compounding a rubber component (A) containing at least one kind selected from natural rubber and synthetic diene rubber, a filler containing an inorganic filler (B), a silane coupling agent (C), and thiourea, the method comprising kneading the rubber composition in plural stages, the rubber component (A), the whole or a part of the inorganic filler (B), the whole or a part of the silane coupling agent (C), and the thiourea being kneaded in the first stage of kneading, and thus provides a method for producing a rubber composition excellent in low-heat-generation property through enhancement of the reactivity between the coupling agent and the rubber component.

Abstract: The invention provides a rubber composition prepared by mixing, per 100 parts by mass of the rubber component comprising at least 50% by mass of a diene-based rubber, from 20 to 150 parts by mass of a filler, and from 0.05 to 30 parts by mass of a compound A which has a specific amidine structure and has a functional group reactive with the diene-based rubber. The rubber composition improves both a high elastic modulus and a low tan ?. The invention also provides a pneumatic tire using the rubber composition.

Abstract: The present invention provides a tire rubber composition prepared by mixing at least one rubber component selected from natural rubbers and synthetic diene rubbers (A), a filler including an inorganic filler (B), a silane coupling agent (C) and a thiosemicarbazone derivative (D), and provides a production method for a tire rubber composition, wherein the tire rubber composition is kneaded in plural stages, and in the first stage of kneading, the rubber component (A), all or part of the inorganic filler (B), all or part of the silane coupling agent (C), and the thiosemicarbazone derivative (D) are kneaded, therefore providing a tire rubber composition having improved reactivity between the coupling agent and the rubber component and excellent in low-heat-generation property and a production method for the composition.

Abstract: The invention provides a rubber composition prepared by mixing, per 100 parts by mass of a rubber component comprising at least 50% by mass of a diene-based rubber, from 20 to 150 parts by mass of a filler, and from 0.05 to 30 parts by mass of a compound A which has a specific guanidine structure and has a functional group reactive with the diene-based rubber. The rubber composition improves both a high elastic modulus and a low tan ?. The invention also provides a pneumatic tire using the rubber composition.

Abstract: The invention provides a rubber composition prepared by mixing, per 100 parts by mass of the rubber component comprising at least 50% by mass of a diene-based rubber, from 20 to 150 parts by mass of a filler, and from 0.05 to 30 parts by mass of a compound A which has a specific amidine structure and has a functional group reactive with the diene-based rubber. The rubber composition improves both a high elastic modulus and a low tan ?. The invention also provides a pneumatic tire using the rubber composition.

Abstract: The present invention relates to a method for producing a rubber composition obtained by compounding a rubber component (A) containing at least one kind selected from natural rubber and synthetic diene rubber, a filler containing an inorganic filler (B), a silane coupling agent (C), and thiourea, the method comprising kneading the rubber composition in plural stages, the rubber component (A), the whole or a part of the inorganic filler (B), the whole or a part of the silane coupling agent (C), and the thiourea being kneaded in the first stage of kneading, and thus provides a method for producing a rubber composition excellent in low-heat-generation property through enhancement of the reactivity between the coupling agent and the rubber component.

Abstract: The present invention is a rubber composition containing a rubber component, a specific hydroxy group-having thiourea derivative, a thioamide compound, an acidic compound, a combination of a nucleophilic reagent except guanidine compounds and a guanidine compound, a compound selected from a phosphorous acid compound and a salt of a phosphorous acid compound, and a filler containing an inorganic filler, and a method for the rubber composition, providing the rubber composition having an improved low-heat-generation property and its production method.

Abstract: This invention relates to an organosilicon compound having a cyclic structure with nitrogen atom and silicon atom, and one or more sulfur atoms in its molecule, and having a bonding side of one or more groups having as small steric hindrance to silicon atom, a rubber composition formed by compounding an inorganic filler (B) and the organosilicon compound (C) into a rubber component (A) consisting of natural rubber and/or diene-based synthetic rubber, and a tire using such a rubber composition.