| abstract |
PROBLEM TO BE SOLVED: To provide a crosslinkable nitrile rubber composition that gives a rubber cross-linked product excellent in heat aging resistance. SOLUTION: A highly saturated nitrile rubber having an α, β-ethylenically unsaturated nitrile monomer unit and an α, β-ethylenically unsaturated dicarboxylic acid monoester monomer unit and having an iodine value of 120 or less ( A crosslinkable nitrile rubber composition comprising a), a crosslinking agent (b) and an anti-aging agent (c), wherein the anti-aging agent (c) is a hindered phenol anti-aging agent having a molecular weight of 300 or more. Preferably, the α, β-ethylenically unsaturated dicarboxylic acid monoester monomer unit is a monoester of a dicarboxylic acid having a carboxyl group at each of two carbon atoms forming an α, β-ethylenically unsaturated bond. Preferably, the α, β-ethylenically unsaturated dicarboxylic acid is maleic acid or fumaric acid. [Selection figure] None |