Patent ID: 8153712
Filing Date: 2012-04-10
Classification: C08K,C08L

Abstract:
1. A crosslinkable rubber composition comprising 0.2 to 10 parts by weight of an aromatic secondary amine-based anti-aging agent and 0.2 to 20 parts by weight of a polyamine-based crosslinking agent with respect to 100 parts by weight of a nitrile rubber, wherein said nitrile rubber has an iodine value of 25 or less and includes as monomer units an α,β-ethylenically unsaturated nitrile monomer unit, 45 to 75 weight-% of a conjugated diene-based monomer unit per 100 weight-% of total monomers units, and an α,β-ethylenically unsaturated dicarboxylic acid monoester monomer unit, in which a monomer forming said α,β-ethylenically unsaturated dicarboxylic acid monoester monomer unit is a monoester monomer of a dicarboxylic acid containing a carboxyl group in each of two carbon atoms forming an α,β-ethylenically unsaturated bond; and wherein said crosslinkable rubber composition is capable of providing a cross-linked rubber wherein O-ring compression set is 71% or less after maintaining the cross-linked rubber in a 25%-compressed state at 150° C. for 504 hours.