| abstract |
(57) [Summary] [Structure] The chlorine content is 20 to 40% by weight, the Muni-viscosity [ML 1 + 4 (121 ° C.)] is 10 to 190, and the ethylene / α before chlorination is A chlorinated ethylene / α-olefin copolymer rubber and its copolymer, characterized in that the olefin copolymer rubber has a vinylidene bond at its molecular end, and this is present from 0.05 to 1.00 per 1000 carbons. A composition containing rubber. [Effect] A rubber product having excellent processability and thermal stability, good vulcanized rubber strength and high modulus, and excellent heat aging resistance and weather resistance is provided. For example, it can be effectively used for electrical insulating materials, automobile industrial parts, industrial rubber products, civil engineering materials, rubberized cloth, and the like. |