| abstract |
PROBLEM TO BE SOLVED: To provide α, β for nitrile group-containing highly saturated copolymer rubber. -To further improve the strength properties, abrasion resistance and the like of a rubber material obtained by vulcanizing a vulcanizable rubber composition containing a metal salt of an ethylenically unsaturated carboxylic acid and an organic peroxide. SOLUTION: A carboxylated nitrile group-containing highly saturated copolymer rubber having an acid equivalent of 2 × 10 −3 ephr or more, a Mooney viscosity of 15 to 200 and an iodine value of 80 or less, α, β- A vulcanizable rubber composition comprising a metal salt of an ethylenically unsaturated carboxylic acid and an organic peroxide. |