Patent ID: 7026387
Filing Date: 2006-04-11
Classification: C08C,C08G,C08K,C08L

Abstract:
1. A process for the preparation of a rubber composition comprising a reinforcing white filler, wherein the rubber composition comprises a diene block copolymer which is intended to interact with said reinforcing white filler, said diene block copolymer comprising on at least one end thereof a polysiloxane block which ends in a trialkylsilyl group, said polysiloxane block corresponding to the formula: in which R wherein the process comprises (a) reacting a living diene polymer with a functionalized polysiloxane comprising at one of its chain ends a halo-organosilane function and, at its other chain end, a trialkylsilyl group, to produce said diene block copolymer comprising said polysiloxane block which ends in a trialkylsilyl group, and (b) mixing, by thermomechanical working, said diene block copolymer with silica, and with conventional additives for obtaining a vulcanizable rubber composition.