Patent ID: 7915354

Claim:
A 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 of a series of two or more reactors, using a Ziegler-Natta catalyst system, wherein the first polymer fraction has a Mooney viscosity of greater than or equal to about 200 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 one or more subsequent reactors of the series of two or more reactors, using a Ziegler-Natta catalyst system, wherein the second polymer fraction has a Mooney viscosity of from about 40 ML(1+4@125° C.) to about 100 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 multimodal polymer composition has a number average molecular weight of from about 60,000 to about 350,000 g/mol, and a Mooney viscosity of less than 90 ML(1+4@125° C.); and wherein the diene in each fraction is independently selected from the group consisting of 5-ethylidene-2-norbornene (ENB), dicyclopentadiene (DCPD), norbornadiene, 5-vinyl-2-norbornene (VNB), divinylbenzene (DVB), and combinations thereof.