Bridgestone Corporation

Otsuka Chemical Holdings Co., Ltd.

Noriko Mori

Kouji Masaki

Ken Tanaka

James E Hall

Yoichi Ozawa

Christopher G Robertson

Junko Matsushita

Georg G A Böhm

Ryuji Nakagawa

Hajime Kondo

Yuki Itoh

Mark Arigo

Shigeaki Matsuo

Sandra Warren

Fumihiro Shiraishi

Eiji Suzuki

Yuuta Hoshino

Naohisa Jinbo

Fuminori Oota

Takashi Kameshima

The invention provides a method for producing a modified conjugated diene (co)polymer, the method including comprising: a modification reaction step including causing an organic silane compound to react with a conjugated diene (co)polymer having an active site at the active site, the organic silane compound having a characteristic group for forming a silanol group through hydrolysis and, in the vicinity of the characteristic group, (i) a functional group which binds the organic silane compound to the conjugated diene (co)polymer via addition to or substitution at the active site and which promotes reaction between the silanol group and a reinforcing filler after the addition or substitution reaction, or (ii) a functional group which promotes reaction between the silanol group and a reinforcing filler, and a hydrolyzation step performed after the modification reaction step; a modified conjugated diene (co)polymer having, at a molecular end of the conjugated diene (co)polymer, a silanol group, and a functional group in the vicinity of the silanol group, the functional group accelerating reaction between the silanol group and the reinforcing filler; a rubber composition containing the (co)polymer and carbon black having specific characteristics; and a tire formed from the rubber composition.

Method for producing modified conjugated diene polymer/copolymer, modified conjugated diene polymer/copolymer, and rubber composition and tire using the same

A tire prepared by using a rubber composition compounded with a modified conjugated diene base polymer obtained by reacting an active site of a conjugated diene base polymer with a hydrocarbyloxysilane compound which may have a functional group to introduce a functional group having high affinity with precipitated silica and precipitated silica in which a cetyltrimethylammonium bromide-adsorbing specific surface area (CTAB) (m/g) and the mode Ain diameters (nm) of primary aggregates determined by acoustic measurement of particle size distribution satisfy equation (A) shown below:&#x2267;&#x2212;0.76&#xd7;(CTAB)+274&#x2003;&#x2003;(A).

Tire prepared by using rubber composition containing modified polymer

This invention provides a rubber composition having excellent workability, fracture characteristics and wear resistance and low heat buildup, which comprises not less than 20 parts by mass of a reinforcing filler (B) and 5 to 60 parts by mass of a modified aromatic vinyl compound-conjugated diene compound copolymer (C) having at least one functional group, an aromatic vinyl compound content of 5 to 80% by mass, a vinyl bond content in a conjugated diene compound portion of 10 to 80% by mass and a weight average molecular weight as measured through a gel permeation chromatography and converted to polystyrene of 5,000 to 500,000 based on 100 parts by mass of a rubber component (A) containing not less than 10% by mass of a modified conjugated diene-based polymer having at least one functional group.

Rubber composition and tire using the same

Branched polymers including multi-branched polymers, functionalized branched polymers, star-branched polymers, and dendigraft polymers. Methods for the synthesis of branched polymers and method for the use of branched polymers in tire components are also included.

Branched polymers and methods for their synthesis and use

This invention relates to a rubber composition having a high storage modulus (G') and a low loss tangent (tan &#x3b4;), and more particularly to a rubber composition comprising 2 to 60 parts by mass of a low-molecular weight aromatic vinyl compound-conjugated diene compound copolymer (B) having an aromatic vinyl compound content of 5 to 80% by mass, a vinyl bond content in a conjugated diene compound portion of 5 to 80% by mass, a weight average molecular weight as measured through a gel permeation chromatography and converted to polystyrene of 5,000 to 500,000 and at least one functional group based on 100 parts by mass of a rubber component (A) composed of at least one of natural rubber and synthetic diene-based rubbers.

Rubber composition and pneumatic tire using the same

This invention relates to a rubber composition having excellent workability, fracture characteristics and wear resistance and a low heat buildup and a high storage modulus (G'), and more particularly to a rubber composition comprising not less than 20 parts by mass of a reinforcing filler (B) and 5 to 60 parts by mass of a low-molecular weight aromatic vinyl compound-conjugated diene compound copolymer (C) having an aromatic vinyl compound content of 5 to 80% by mass, a vinyl bond content in a conjugated diene compound portion of 10 to 80% by mass and a weight average molecular weight as measured with a gel permeation chromatography and converted to polystyrene of 5,000 to 300,000 based on 100 parts by mass of a rubber component (A) containing not less than 10% by mass of a modified conjugated diene-based polymer having at least one functional group.

Rubber composition and tire using same

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Kodaira, Japan

Noriko Mori