Rubber composition for tire-tread having high frictional force on ice and pneumatic tire using same
AssigneeThe Yokohama Rubber Co., Ltd.
InventorsNaoya Amino, Yoichi Yamaguchi, Masayoshi Daio
Life of this patent
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Abstract
1. A rubber composition for a tire tread containing: (i) 100 parts by weight of a diene rubber, and (ii) 1 to 20 parts by weight of an elastic gas-encapsulated thermoplastic resin hollow particle having a particle size of 5-300 .mu.m, which is obtained by expanding, upon heating during vulcanization, a thermally expansible thermoplastic resin containing an encapsulated liquid or solid substance capable of generating a gas by vaporization, decomposition or chemical reaction upon heating to form the hollow-type expanded particle and, optionally containing (iii) 1 to 20 parts by weight of a short fiber or (iv) 1 to 20 parts by weight of a hard particle.
Claims15
A rubber composition in a tire tread for a pneumatic tire comprising:
- (i) 100 parts by weight of a diene rubber selected from the group consisting of natural rubber (NR), butadiene rubbers (BR), styrene-butadiene copolymer rubbers (SBR) and polyisoprene rubbers (IR), and
- (ii) 1 to 20 parts by weight of an elastic gas-encapsulated thermoplastic resin hollow particle having a particle size of 5-300 .mu.m, which is obtained by expanding, upon heating during vulcanization of the diene rubber with sulfur, a thermally expansible thermoplastic resin containing an encapsulated liquid or solid substance capable of generating a gas by vaporization, decomposition or chemical reaction upon heating to form the hollow-type expanded particle.
Dependencies are inferred from the claim text.