Patent ID: 6177503
Filing Date: 2001-01-23
Classification: B60C,C08K,C08L,Y10T

Abstract:
A rubber composition which comprises:a rubber component which is a blend rubber of a copolymer rubber and other diene based rubbers or the copolymer rubber alone, the copolymer rubber being obtained by copolymerization of 1,3-butadiene and styrene using an organolithium compound as an initiator, the copolymer rubber having a glass transition temperature of -60.degree. C. or higher, a styrene content of 15 to 30% by weight and a vinyl content of 40 to 70% of a butadiene portion and the blend rubber comprising 55 parts by weight or more of the copolymer rubber and 45 parts by weight or less of the other diene based rubbers in 100 parts by weight of the rubber component;20 to 100 parts by weight of silica per 100 parts by weight of the rubber component;0 to 100 parts by weight of carbon black per 100 parts by weight of the rubber component, a ratio by weight of the amount of silica to the amount of carbon black being 1:1 to 1:0; andin an amount of 1 to 20% by weight of the amount of silica, a silane coupling agent represented by following general formula (1):(C.sub.n H.sub.2n+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 25% or more based on the entire amount of the silane coupling agent, and the content of high polysulfide 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.