Polypropylene reinforced rubber

Details Polypropylene reinforced rubber Polypropylene reinforced rubber

1990-03-05

1991-06-11

Lieberman, Allan M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525236, 1563941, C08L 900, C08L 2312

Patent

active

050233017

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.

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