| abstract |
PROBLEM TO BE SOLVED: To provide a rubber composition containing silica capable of giving a rubber crosslinked product having excellent low heat build-up, wet grip properties and abrasion resistance. A rubber composition comprising silica mixed with a conjugated diene rubber containing a specific amount of isoprene units, The rubber is obtained by polymerizing a monomer mixture composed of 1,3-butadiene and an aromatic vinyl monomer in a hydrocarbon solvent using an organic active metal as an initiator, and then adding and polymerizing isoprene. A rubber composition obtained by reacting the obtained polymer having an active terminal with a coupling agent. |