Acrylic rubber composition

An acrylic rubber composition, based on 100 parts by weight of carboxyl group-containing acrylic rubber:

• 0.05 to 5 parts by weight of a diurethane compound represented by the general formula:
• R2(SO2)m(CH2)nOCONHR1NHCOO(CH2)n(SO2)mR2
• wherein R1 is a C1-C20 linear or branched divalent aliphatic alkylene group, a divalent alicyclic hydrocarbon group, or a divalent aromatic group;
• R2 is, when it is in a carbamate structure form, a group that decomposes by the action of a basic vulcanization accelerator to generate diamine, and is a C1-C20 alkyl group, an alkoxyl group, a phenoxy group, a haloalkyl group, an olefin group, an aryl group, an aralkyl group, a fluorenyl-containing group, an S-containing group, an Si-containing group, an N-containing group, or a P-containing group, the S-containing group or the N-containing group being a heterocyclic aromatic or alicyclic group;
• n is 0, 1, or 2;
• and m is 0 or 1;
• 0.3 to 3 parts by weight of a diaminodiphenyl ether-based compound;
• and
• 0.08 to 1.2 parts by weight of an N-containing heterocyclic compound;
• the composition being free from 1,3-di-o-tolyguanidine.