Ethylene-.alpha.-olefin-non-conjugated diene copolymer...

Details Ethylene-.alpha.-olefin-non-conjugated diene copolymer... Ethylene-.alpha.-olefin-non-conjugated diene copolymer...

C - Chemistry, Metallurgy

08

L

C08L 19/00 (2006.01) C08L 23/16 (2006.01)

Patent

CA 2159417

An ethylene-.alpha.-olefin-non-conjugated diene copolymer rubber composition which comprises two kinds of ethylene-.alpha.-olefin-non-conjugated diene copolymers [the copolymers (A) and (B)], copolymer (A) containing ethylidenenorbornene and either dicyclopentadiene or .alpha.,.omega-diene having 8 to 20 carbon atoms in the main chain as the non-conjugated dienes, copolymer (B) containing ethylidenenorbornene as the non-conjugated diene, the weight ratio of the copolymer (A) to the copolymer (B) being 30/70 to 70/30, wherein the copolymer (A) has a relatively low molecular weight, a specific ethylene/.alpha.-olefin weight ratio and a specific non-conjugated diene content and the copolymer (B) has a relatively high molecular weight and a specific ethylene/.alpha.-olefin weight ratio. Said copolymer rubber composition, when highly foamed, shows no reduction particularly in low tensile stress, and is excellent in shape-retention during cross-linking and foaming, and in compression set and processibility.

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