Vulcanization of ethylene/alpha-olefin rubbers.

摘要

An ethylene/ alpha -olefin vulcanized rubber composition being good weather resistance and high transparency is prepared by vulcanizing, with an organic peroxide, an unvulcanized rubber composition comprising an ethylene/ alpha -olefin rubber containing no metal oxide nor metal carbonate added thereto and containing per 100 parts by weight of ethylene/ alpha -olefin rubber: (i) from 10 to 70 parts by weight of anhydrous silica having an average primary particle diameter of 20 nm or less; (ii) from 0.01 to 2 parts by weight of at least one compound of the formula: <CHEM> <CHEM> and/or <CHEM> (in which Ro is a hydrogen atom or a C1-C3 alkyl group; R1 is a C1-C3 alkyl group; R2 is a C6-C10 alkyl group, and n is real number from 1 to 5); and (iii) from 0 to 2 parts by weight of at least one compound of the formula: <CHEM> (in which R3 is a C1-C9 alkyl group); and/or <CHEM> (in which R4 is a C1-C6 alkyl group; X is C, S, C-C or O-C-C-O and is 1,2 or 4; m is an integer from 1 to 6; and m' is an integer from 1 to 16). The vulcanized composition may also contain 1 or 0.1 to 2 parts by weight of a compound of the formula: <CHEM> (in which R5 is a hydrogen atom or a C1-C8 alkyl group and Y is a hydrogen or chlorine atom).