Patent ID: 6114451
Filing Date: 2000-09-05
Classification: B60C,C08L

Abstract:
A rubber blend consisting of:a polybutadiene rubber blend (A)+(B) composed of:(A) not less than 30% by weight but less than 70% by weight of a high molecular weight polybutadiene comprising, as the main component, a polybutadiene having in intrinsic viscosity [.eta.] of 3.0 to 7.0 as measured in toluene at 30.degree. C. and a cis-1,4-configuration content of at least 80% and(B) more than 30% by weight but not more than 70% by weight of a low molecular weight polybutadiene comprising, as the main component, a polybutadiene having an intrinsic viscosity [.eta.] of 0.1 to 0.5 as measured in toluene at 30.degree. C., and(C) a diene type rubber other than the above components (A) and (B),wherein the polybutadiene rubber blend (A)+(B) is contained in a proportion of 35 to 95 percent by total weight of rubber blend (A)+(B)+(C) rubber composition.