Patent ID: 6550508
Filing Date: 2003-04-22
Classification: B60C,C08K,C08L,Y10T

Abstract:
A rubber composition for a tire tread comprising:100 parts by weight of a diene rubber; 30-90 parts by weight of at lest one reinforcing filler selected from the group consisting of carbon blacks and silicas; and a gas-encapsulated thermoplastic resin particle having an average particle size of 30-150 &mgr;m obtained by expanding, upon heating, 1-20 parts by weight of a thermally expansible thermoplastic resin particle containing therein a liquid or solid substance, which is capable of generating a gas by vaporization, decomposition or chemical reaction upon heating, at a temperature of an expansion starting temperature thereof or more, followed by vulcanization, said thermally expansible thermoplastic resin particle comprising a thermoplastic resin having an expansion starting temperature of from 70Â° C. to less than 120Â° C. and having a heat resistance to withstand the vulcanization of a rubber.