| 摘要 |
Rubber compositions for use in tire tread compounds comprise co-vulcanizable blends of high 1,2 (vinyl) content polybutadiene of high molecular weight and high cis-1,4-poly-butadiene of high molecular weight. The blends show a high degree of homogeneity, so that they act effectively as a single polymer, and exhibit a substantial absence of a glass transition temperature. The relative amounts of the two polymers are such as to obtain a 1,2-group content in the blend of from 35-65 percent. The blend may be compounded with conventional compounding ingredients for curing purposes, and optionally with additional polymers such as natural rubber and/or SBR. The vulcanizates of the compositions exhibit a superior and unexpected balance of resilience, traction and wear properties. |
