Patent ID: 8716407

Claim:
A vulcanizable composition comprising a) 100 parts by weight, based on 100 parts by weight of rubber, one or more hydrogenated nitrile rubbers, in which the Mooney viscosity (ML 1+4@100° C.) is in the range from 10 to 120 MU, where the Mooney viscosity is determined to ASTM standard D1646, which are co- or terpolymers based on at least one conjugated diene and at least one α,β-unsaturated nitrile monomer and optionally one additional copolymerizable monomer, in which the degree of hydrogenation of the diene units incorporated into the polymer is in the range from 95 to 100%, b) from 5 to 80 parts by weight, based on 100 parts by weight of rubber, one or more unsaturated carboxylic acids and/or one or more salts thereof, and the unsaturated carboxylic acid is selected from the group consisting of methacrylic acid, acrylic acid, cinnamic acid, crotonic acid and itaconic acid and the salts are selected from the group consisting of sodium, potassium, magnesium, calcium, zinc, barium, aluminum, tin, zirconium and lithium, c) from 0.2 to 8 parts by weight, based on 100 parts by weight of rubber, at least one peroxide and d) at least one microgel having a glass transition temperature below −20° C. wherein the microgel is present in the composition and is present in an amount up to 50 parts by weight, based on 100 parts by weight of rubber, and e) from 0 to 100 parts by weight based on 100 parts by weight of rubber optionally one or more conventional rubber additives.