To obtain an ethylenic copolymerized rubber composition excellent in covulcanization of the ethylenic copolymerized rubber and a conjugated dienic rubber, while maintaining excellent gummy characteristics and resistant characteristics to a dynamic fatigue, which is substantial characteristics original to the vulcanizate of the conjugated dienic rubber, and usable for production of a vibration-proof rubber excellent in weather resistance (thermal aging resistance) and ozone resistance.
This ethylenic copolymerized rubber composition for a vibration- proof rubber comprises (A) a brominated ethylenic copolymerized rubber obtained by bromination of a copolymerized rubber composed of ethylene, α- olefin and a nonconjugated polyene, and having 0.2-5 wt.% content of bromine, and (B) at least one kind of a dienic rubber selected from a natural rubber and a polyisoprene rubber in a weight ratio [the brominated ethylenic copolymerized rubber A/ the dienic rubber B] of (50/50)-(10/90).
HASEGAWA KENJI
TSUTSUMI FUMIO
