| abstract |
(57) [Summary] [Purpose] Ethylene / α that can form vulcanizates with high fluidity, high strength and hardness, and excellent high temperature compression set. -Providing olefin / non-conjugated diene copolymer rubber. [Composition] Mooney viscosity (ML 1 + 4 , 100 ℃) is 5 90, ethylene / α-olefin weight ratio is 70 / 30- 90/10, content of non-conjugated diene is iodine value 2-5 An ethylene / α-olefin / non-conjugated diene copolymer rubber having a cyclohexane insoluble content of 4 to 50% by weight and a melting point peak of an ethylene crystal part in a differential scanning calorimeter (DSC) measurement. 40 ℃ ~ 100 ℃ Ethylene / α-olefin / non-conjugated diene copolymer rubber |