Patent ID: 7550536

Claim:
An oil-resistant and weather-resistant rubber composition comprising (X) an acrylic ester-based copolymer rubber in an amount from 10 to 50% by mass and (Y) an α, β-unsaturated nitrile conjugated diene copolymer in an amount from 90 to 50% by mass (provided (X)+(Y)=100% by mass), wherein said acrylic ester-based copolymer rubber is comprised of: (A) a structural unit derived from at least one monomer selected from the group consisting of an acrylic acid alkyl ester and an acrylic acid alkoxyalkyl ester in an amount from 40 to 91.9% by mass, (B) a structural unit derived from an unsaturated nitrile monomer in an amount from 8 to 40% by mass, (C) a structural unit derived from at least one monomer selected from the group consisting of a non-conjugated cyclic polyene and compounds represented by the following formula (1) in an amount from 0.1 to 20% by mass (provided (A)+(B)+(C)=100% by mass), and (D) a structural unit derived from an unsaturated monomer having an epoxy group in an amount from 0.1 to 20 parts by mass when the total of said structural units (A), (B) and (C) is defined as 100 parts by mass, wherein the Mooney viscosity [ML 1+4 (100° C.)] is in the range from 10 to 200, wherein X 1 represents a hydrogen atom or a methyl group, and n is an integer from 0 to 10.