ELASTOMERIC COMPOSITION HAVING INCREASED OZONE RESISTANCE

摘要

An elastomeric composition, formed by curing a blend comprised of: (A) between about 83 and About 94 phr of a highly unsaturated rubber; (B) between about 3 and about 27 phr of ethylene/propylene/nonconjugated diene terpolymer having a number average molecular weight of more than about 35,000; (C) between about 3 and about 27 phr of ethylene/propylene/nonconjugated diene terpolymer having a number average molecular weight of between about 500 and about 15,000; between about 2 and about 7.5 phr of a quinoline antioxidant; and (D) an effective amount of curative; exhibit unexpectedly desirable ozone resistance. Also disclosed is a process for preparing such elastomeric compositions.