Patent ID: 6043321
Filing Date: 2000-03-28
Classification: C08C,C08F

Abstract:
An asymmetrical tin-coupled rubbery polymer tire tread compounds, said asymmetrical tin-coupled rubbery polymer being comprised of a tin atom having at least three polydiene arms covalently bonded thereto, wherein at least one of said polydiene arms has a molecular weight of less than about 40,000, wherein at least one of said polydiene arms has a molecular weight of at least about 80,000, wherein the polydiene arms are selected from the group consisting of isoprene-butadiene chains, isoprene chains, and butadiene chains, and wherein the ratio of the weight average molecular weight to the number average molecular weight of the asymmetrical tin-coupled rubbery polymer is within the range of about 2 to about 2.5.