Patent ID: 6734218
Filing Date: 2004-05-11
Classification: C08J,C09K

Abstract:
A process for producing a foamed rubber having a density of from 0.30 to 0.50 g/cm3, which comprises the step of foaming and cross-linking a rubber composition containing (i) an ethylene-&agr;-olefin-non-conjugated diene copolymer rubber satisfying the following conditions (A) to (D), (ii) a vulcanizing agent and (iii) a foaming agent;(A) a xylene-insoluble part in the copolymer rubber is from 5 to 20% by weight, or a cyclohexane-insoluble part therein is from 5 to 30% by weight, (B) a weight ratio of an ethylene polymerization unit/an &agr;-olefin polymerization unit in the copolymer rubber is from 73/27 to 40/60, (C) a content of a non-conjugated diene polymerization unit in the copolymer rubber is from 18 to 36 in terms of an iodine value, and (D) Mooney viscosity (ML1+4(121Â° C.)) of the copolymer rubber measured according to JIS-K-6300-Mooney viscosity test is from 50 to 120.