Patent ID: 7459495

Claim:
An acrylic rubber composition comprising: (A) 100 parts by weight of an acrylic rubber consisting of 80 to 99.9% by weight of units of at least one monomer selected from the group consisting of acrylic acid ester monomers and methacrylic acid ester monomers, and 0.1 to 20% by weight of units of a monoester of an α,β-ethylenically unsaturated dicarboxylic acid monomer having 3 to 11 carbon atoms with an alkanol having 1 to 8 carbon atoms, (B) 5 to 200 parts by weight of synthetic silica having a BET specific surface area of not larger than 200 m 2 /g, (C) 0.05 to 20 parts by weight of a polyamine compound, and (D) 5 to 200 parts by weight of aluminum silicate containing at least 5% by weight of Al 2 O 3 wherein the total amount of Al 2 O 3 and SiO 2 is at least 60% by weight based on the aluminum silicate.