Patent ID: 6548604
Filing Date: 2003-04-15
Classification: C08C,C08F,C08L

Abstract:
A nitrile group-containing highly saturated copolymer rubber comprising (a) 10 to 40% by weight of &agr;,&bgr;-ethylenically unsaturated nitrile monomer units, (b) 10 to 60% by weight of &agr;,&bgr;-ethylenically unsaturated carboxylic acid ester monomer units, (c) 0.01 to 21% by weight of conjugated diene monomer units, and (d) 14 to 69.99% by weight of saturated conjugated diene monomer units, wherein the sum of monomer units (a) and monomer units (d) is in the range of 20 to 70% by weight, the ratio of monomer units (d) to the sum of monomer units (c) and monomer units (d) is at least 70% by weight, and the difference between the extrapolated glass transition-initiating temperature (Tig) and the extrapolated glass transition-ending temperature (Teg), as measured by the differential scanning calorimetry, is not higher than 10Â° C.