Crosslinkable rubber composition and cross-linked rubber

Abstract

A crosslinkable rubber composition comprising 0.2 to 10 parts by weight of an aromatic secondary amine-based anti-aging agent and 0.5 to 20 parts by weight of a polyamine-based crosslinking agent with respect to 100 parts by weight of a nitrile rubber including an α,β-ethylenically unsaturated nitrile unit and an α,β-ethylenically unsaturated dicarboxylic acid monoester unit, and with iodine value of 120 or less. The present invention can provide a crosslinkable rubber composition, providable of a cross-linked rubber excellent in a variety of properties such as mechanical strength and small in compression set, and a cross-linked rubber obtained by cross-linking the rubber composition.

1 . A crosslinkable rubber composition comprising
 0.1 to 20 parts by weight of a primary monoamine having no polar group other than an amino group and   0.1 to 20 parts by weight of a polyamine-based crosslinking agent   with respect to 100 parts by weight of a nitrile rubber including an α,β-ethylenically unsaturated nitrile monomer unit and an α,β-ethylenically unsaturated dicarboxylic acid monoester monomer unit and having iodine value of 120 or less.   
     
     
         2 . The crosslinkable rubber composition as set forth in  claim 1 , wherein said primary monoamine having no polar group other than an amino group is an aliphatic primary monoamine. 
     
     
         3 . The crosslinkable rubber composition as set forth in  claim 1 , wherein said nitrile rubber is a hydrogenated rubber. 
     
     
         4 . A cross-linked rubber obtained by cross-linking the crosslinkable rubber composition as set forth in  claim 1 . 
     
     
         5 . The cross-linked rubber as set forth in  claim 4 , which is a seal material. 
     
     
         6 . The cross-linked rubber as set forth in  claim 4 , which is a belt material.