NITRILE GROUP-CONTAINING HIGHLY-SATURATED COPOLYMER RUBBER COMPOSITION AND CROSSLINKED RUBBER

摘要

A nitrile group-containing highly saturated copolymer rubber composition comprising a nitrile group-containing highly saturated copolymer rubber (A) having ±,²-ethylenically unsaturated nitrile monomer units and (meth) acrylic acid ester monomer units and having an iodine value of 120 or less and a polyether ester-based plasticizer (B) having structural unit comprised of three or more ether compounds which are successively bonded is provided. According to the present invention, a nitrile group-containing highly saturated copolymer rubber composition excellent in vulcanization speed and giving cross-linked rubber having excellent heat resistance and cold resistance can be provided.