The Yokohama Rubber Co., Ltd.

Hidekazu Onoi

Keisuke Chino

Tetsuji Kawazura

Kazunori Ishikawa

Fumito Yatsuyanagi

Satoshi Mihara

Hiroyuki Kaido

Masahiro Ikawa

A process for producing a modified polymer having, in the molecule thereof, an organic group(s) introduced thereinto and derived from a compound(s) having a free radical comprising reacting a polymer such as an elastomer with a compound having the free radical stable at an ordinary temperature in the presence of oxygen, after or while a carbon radical(s) is generated in the polymer, whereby the modified polymer having an improved bondability and processability is formed.

Process for producing modified polymer

A silica-polymer composite, featuring a low viscosity and excellent processability when being kneaded with a rubber and superior in dispersibility and tensile strength, comprising a polymer having a polar group containing a hetero atom and a benzene ring or a polymer having a carboxylic acid reacted with silica in a solution.

Silica-polymer composite, method of production thereof, and rubber composition using the same

A rubber composition containing 50 to 90 parts by weight of a diene rubber and 50 to 10 parts by weight of a gelled rubber having a toluene swelling index of 16 to 150, based upon the total amount of 100 parts by weight of the diene rubber and the gelled rubber.

Rubber composition and production process thereof

A modified polybutene(polyisobutylene) containing isobutylene repeating units and having, in the main chain, at the ends, and/or at the side chains of the polymer chain thereof, free radicals stable at a room temperature and in the presence of oxygen, or having a half-ester structure, amide structure, onium salt structure, or imide structure or acid anhydride residual group, as well as a rubber composition containing the same.

Polymer containing isobutylene as repeating unit and rubber composition containing the same

Vulcanizing agent for rubber and rubber composition containing the same

Rubber compositions for footwear, conveyor belt covers, rolls, hoses, cables, rubberized fabrics, and grips containing (A) an elastomer, (B) 5 to 150 parts by weight of a filler, and (C) a polysiloxane represented by the formula (I):

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Hiratsuka, Japan

Hidekazu Onoi