RUBBER COMPOSITION AND PROCESS FOR PRODUCING THE SAME

摘要

A rubber composition which comprises: 20 to 80 parts by weight of a conjugated diene rubber (A) comprising 40 to 100 wt.% conjugated diene units and 0 to 60 wt.% aromatic vinyl monomer units and having a Mooney viscosity of 70 to 200; and 80 to 20 parts by weight of a conjugated diene rubber (B) comprising 40 to 99.8 wt.% conjugated diene units, 0 to 59.8 wt.% aromatic vinyl monomer units, and 0.2 to 20 wt.% aminated monomer units and having a Mooney viscosity which is 20 to 150 and is lower by at least 10 than that of the conjugated diene rubber (A) (the sum of the conjugated diene rubber (A) and the conjugated diene rubber (B) is 100 parts by weight). A compound obtained by compounding this rubber composition with a silica reinforcement gives, through molding with rolls, a sheet excellent in surface shape and tensile properties and reduced in heat build-up.