CROSS-LINKED RUBBER COMPOSITION AND CROSS-LINKED RUBBER

摘要

The purposed of the present invention is to provide an ethylene-alpha-olefin-nonconjugated diene copolymer rubber having the property of lower compression set. This ethylene-alpha-olefin-nonconjugated diene copolymer rubber-type cross-linked rubber composition contains the following components (a) through (c): (a) an ethylene-alpha-olefin-nonconjugated diene-type copolymer rubber, (b) a polybutadiene (which may be partially hydrogenated) having a viscosity of 800-6000 poise (25°C) and comprising 75-100 mol% of repeating units represented by formula (I) and 25-0 mol% of repeating units represented by formula (II), and (c) an organic peroxide.