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:
Jun. 11, 1991
Filed:
Mar. 05, 1990
Donald J Burlett, Wadsworth, OH (US);
Richard G Bauer, Kent, OH (US);
Mellis M Kelley, Akron, OH (US);
The Goodyear Tire & Rubber Company, Akron, OH (US);
Abstract
The present invention relates to a process for improving the modulus of a rubber without sacrificing other properties. By utilizing the process of this invention, rubber compositions having increased modulus are prepared by the formation of polypropylene fibrils randomly dispersed throughout the rubber matrix. The present invention includes (1) forming a blend of (a) a polymer alloy containing polypropylene and (b) an unvulcanized rubber stock wherein said polypropylene is present in said blend in an amount ranging from about 5 phr to about 25 phr; and (2) vulcanizing the rubber stock in said blend after orienting said polypropylene by the application of heat and flowing said blend within a mold cavity.