Patent ID: 8653197

Claim:
A thermoplastic vulcanizate composition comprising a dynamically-cured rubber; and from about 20 to about 300 parts by weight of a thermoplastic resin per 100 parts by weight dynamically-cured rubber; wherein the dynamically-cured rubber comprises a multimodal polymer composition cured with a curing agent, the multimodal polymer composition comprising: a) 45 to 75 wt % of a first polymer fraction comprising ethylene, a C 3 -C 10 alpha-olefin, and a non-conjugated diene, wherein the first polymer fraction has been polymerized in a first reactor in a series of two or more reactors using a first Ziegler-Natta catalyst system, wherein the first polymer fraction has a Mooney viscosity of greater than or equal to about 150 ML(1+4@125° C.); b) 25 to 55 wt % of a second polymer fraction comprising ethylene, a C 3 -C 10 alpha-olefin, and a non-conjugated diene, wherein the second polymer fraction has been polymerized in the presence of the first polymer fraction in a subsequent reactor in the series of two or more reactors using a second Ziegler-Natta catalyst system, wherein the second polymer fraction has a Mooney viscosity of greater than or equal to 55 Ml(1+4@125° C.), and less than or equal to 120 ML(1+4@125° C.); and c) from about 10 phr to about 50 phr of an extender oil, which is a liquid at 25° C., wherein the first polymer fraction and second polymer fraction combined have a number average molecular weight of greater than or equal to about 60,000, and less than or equal to about 350,000 g/mol, and a Mooney viscosity of 121 to 141 ML(1+4@125° C.).