The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 26, 1988
Filed:
Sep. 29, 1986
Joseph Odar, South Euclid, OH (US);
Walter Von Hellens, Bright's Grove, CA;
Polysar Limited, Sarnia, CA;
Abstract
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. Both of the polymers in the composition should have a relatively high weight average molecular weight. 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 (i.e. from 35-65 percent of the polymer units are in the 1,2-configuration). The blend may be compounded with conventional compounding ingredients for curing purposes, and optionally with additional polymers as natural rubber and/or SBR. The vulcanizates of the compositions exhibit a superior and unexpected balance of resilience, traction and wear properties.