Patent ID: 6703448
Filing Date: 2004-03-09
Classification: B60C,C08F,C08L,Y02T,Y10T

Abstract:
A cross-linkable or cross linked rubber composition comprising an elastomeric matrix, said composition exhibiting a reduced hysteresis in the cross-linked state and being usable in a tire tread,wherein said elastomeric matrix comprises a block copolymer having n blocks, each of said blocks comprising an essentially unsaturated diene elastomer having a molar content of units originating from conjugated dienes of greater than 15%, and one or each of said blocks which forms the chain end of said copolymer consisting of a polyisoprene, wherein n=2 or 3, wherein the number-average molecular weight Mn1 of said or each polyisoprene end block is between about 2,500 and 20,000 g/mol, wherein the number-average molecular weight Mn2 of the block of said copolymer which is other than said or each polyisoprene end block is between about 80,000 and 350,000 g/mol.