Patent ID: 6242516
Filing Date: 2001-06-05
Classification: C08K,Y02T

Abstract:
A rubber composition which comprises:a blend rubber of a copolymer and other diene based rubbers, the copolymer comprising a bond between tin and a butadienyl group in the main chain and being obtained by copolymerization of 1,3-butadiene and an aromatic vinylmonomer using an organo lithium compound as an initiator, adding a halogenated tin compound thereto and effecting a coupling reaction, the glass transition point of the copolymer being -50.degree. C. or higher, and the blend rubber comprising the copolymer in an amount of 20 parts by weight or more and the other diene based rubbers in an amount of 80 parts by weight or less per 100 parts by weight of the blend rubber;silica filler in an amount of 10 to 80 parts by weight per 100 parts by weight of the blend rubber;carbon black in an amount of 20 to 80 parts by weight per 100 parts by weight of the blend rubber, andin an amount of 1 to 20% of by weight of the amount of silica, a silane coupling agent represented by following general formula (1):(C.sub.n H.sub.2+1 O).sub.3 Si--(CH.sub.2).sub.m --S.sub.y (CH.sub.2).sub.m --Si(OC.sub.n H.sub.2n+1).sub.3 (1)wherein n represents an integer of 1 to 3, m represents an integer of 1 to 9, y represents a positive number of 1 or more and has a distribution, and in which the content of trisulfide silane component, where y is 3, is 20% or more based on the entire amount of the silane coupling agent, and the content of high polysulfide silane components, where y is 5 or a number greater than 5, is 50% or less based on the entire amount of the silane coupling agent.