FIELD: chemistry.
SUBSTANCE: invention relates to a highly-saturated polymer rubber composition. Described is nitrile group-containing highly-saturated copolymer rubber composition containing nitrile group-containing highly-saturated copolymer rubber (A) comprising α,β-ethylenically unsaturated nitrile monomeric units and (meth)acrylic acid ester monomeric units, and having an iodine value of not more than 120, and polyether-ester plasticizer (B) comprising structural unit formed by linking three or more ether compounds, having the content of α,β-ethylenically unsaturated nitrile monomer units of 10 wt% to 30 wt% and the content of (meth)acrylic acid ester monomeric units of 20 wt% to 50 wt% with respect to all monomer units forming a nitrile group-containing highly saturated copolymer rubber (A). Crosslinked rubber composition and crosslinked rubber are also described.
EFFECT: crosslinked rubber having excellent resistance to heat and cold is obtained.
7 cl, 1tbl, 3 ex
