| abstract |
An oil-extended rubber comprising a conjugated dienenrubber having a specific amount of isoprene units, and annextender oil incorporated therein, characterized in that thenrubber is obtained by polymerizing a monomer mixturencomprising 1,3-butadiene and an aromatic vinyl monomer withnthe aid of an organic active metal as an initiator in anhydrocarbon medium; subsequently adding isoprene to continuenpolymerization, then; reacting the resulting polymer havingnan activated terminal with a coupling agent. A rubberncomposition comprising the oil-extended rubber is suitablenfor tread of tire having a low fuel consumption. |