Patent ID: 8530550

Claim:
A crosslinkable rubber composition comprising as essential components: (A) 100 parts by weight of an ethylene-α-olefin-nonconjugated polyene random copolymer rubber in which the nonconjugated polyene has at least one terminal vinyl group-containing norbornene compound represented by the following general formula (I) or (II), wherein n is an integer of 0 to 10, R 1 is hydrogen atom or an alkyl group of 1 to 10 carbon atoms, and R 2 is hydrogen atom or an alkyl group of 1 to 5 carbon atoms, wherein R 3 is hydrogen atom or an alkyl group of 1 to 10 carbon atoms, and which has a viscosity of not less than 10 Pa·s and less than 1,000 Pa·s at 25° C. under a shear rate of 10 s −1 ; (B) 0.1 to 50 parts by weight of an organopolysiloxane which has three Si-bonded hydrogen atoms per molecule in side chains of siloxane represented by the following formula: wherein the groups R 4 are independently unsubstituted or substituted monovalent hydrocarbon groups having 1 to 20 carbon atoms and m is an integer of 1 to 20; (C) 0 to 100 parts by weight of a reinforcing filler; (D) a catalytic amount of a curing catalyst; and (E) 0.001 to 5 parts by weight of a curing reaction retarder.