Patent ID: 8034881

Claim:
A cross-linkable nitrile rubber composition containing a highly saturated nitrile rubber (a) having an α,β-ethylenically unsaturated nitrile monomer unit and a carboxyl-group containing monomer unit and having an iodine value of 120 or less, a polyamine-based cross-linking agent (d), and a cyclic amidine and/or cyclic amidinium salt (c) of the following formula (1): wherein R 1 and R 2 independently indicate a hydrogen atom, an alkoxy group, an alkyl group which may have a substituent, alkenyl group which may have a substituent, or aryl group which may have a substituent, R 1 and R 2 may bond to form a cyclic structure, and, further, R 3 indicates an alkylene group or alkenylene group which may have a substituent.