Patent ID: 7838591

Claim:
A process for producing a vulcanized molded article of a rubber composition, which comprises the steps of: (1) polymerizing ethylene, an α-olefin having 3 to 20 carbon atoms and a non-conjugated polyene in the presence of a catalyst made from a combination of a catalyst component having an average composition represented by the following formula (I) with an organoaluminum compound as a co-catalyst component represented by the following formula (II); VO(OR) m (OR′) n X 3-m-n (I) R″ k AlX 3-k (II) wherein R is an at least secondary hydrocarbon group having 1 to 8 carbon atoms; R′ is a linear hydrocarbon group having 1 to 8 carbon atoms; X is a halogen atom; each of m and n is a positive number satisfying m+n≦3; R″ is a hydrocarbon group; and k is an integer satisfying 0≦k≦3; thereby producing an ethylene-α-olefin-non-conjugated polyene copolymer rubber (A) containing 50 to 90% by mole of an ethylene unit and 10 to 50% by mole of an α-olefin unit, the total amount of both units being 100% by mole; having an iodine value of 1 to 50; and having an intrinsic viscosity of 2 to 5 dl/g measured in tetrahydronaphthalene at 135° C.; (2) kneading at least 100 parts by weight of the ethylene-α-olefin-non-conjugated polyene copolymer rubber (A), 1 to 150 parts by weight of a reinforcement (B), and 1 to 150 parts by weight of a softener (C), thereby producing a kneaded product; (3) mixing said kneaded product with 0.1 to 10 parts by weight of a vulcanizing agent (D), thereby producing a rubber composition; and (4) injection molding, compression molding or transfer molding said rubber composition, thereby producing a vulcanized molded article.