Patent ID: 7179866

Claim:
A vibration damping rubber composition comprising: a diene-based rubber; a vulcanizing agent of a bismaleimide compound represented by the following formula (1): [wherein X denotes a substituted or unsubstituted aliphatic saturated hydrocarbon group; and R 1 to R 4 may be the same or different and each denote a hydrogen atom, an alkyl group, —NH 2 , or —NO 2 , provided that the bismaleimide compound represented by formula (1) excludes a compound in which X is —(CH 2 )n- (n is an integer of 4 to 12) and all R 1 to R 4 are hydrogen atoms], wherein the vulcanizing agent is sulfur-free; a thiazole-based vulcanization accelerator; and a thiuram-based vulcanization accelerator.