Patent ID: 8841383
Filing Date: 2014-09-23
Classification: B60C,C08L

Abstract:
1. An elastomer composition comprising a blend of: (a) 15 to 25 phr of an ethylene-propylene-diene terpolymer comprising: (b) 75 to 85 phr of a blend rubber selected from the group consisting of natural rubbers, polyisoprene rubber, poly(styrene-co-butadiene) rubber, polybutadiene rubber, poly(isoprene-co-butadiene) rubber, styrene-isoprene-butadiene rubber, butyl rubber, star branched butyl rubber, poly(isobutylene-co-alkylstyrene), polychloroprene rubber, nitrile rubber and mixtures thereof; (c) 2 to 20 phr of polybutene processing oil, wherein the polybutene processing oil comprises from 40 to 98 wt % isobutylene derived units, from 2 to 40 wt % 1-butene derived units, and from 0 to 40 wt % 2-butene derived units; and (d) a secondary blend rubber comprising an ethylene-propylene-diene rubber having a crystallinity that is due to ethylene-derived sequences.