Patent ID: 6058994
Filing Date: 2000-05-09
Classification: B29K,B60C,C08J,Y10S

Abstract:
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.