| abstract |
A method for producing a rubber composition for a tire by compounding, at a first mixing step, into 50 parts by weight or more of 100 parts by weight of a diene-based rubber containing 50 parts by weight of natural rubber and/or synthetic polyisoprene rubber and 50 parts by weight or less of a butadiene rubber, 5 to 30 parts by weight of silica and 3 to 15% by weight of a silane coupling agent, based upon the weight of silica, to form a master batch, then, at a second mixing step, adding, to the resultant master batch, the balance of diene-based rubber and carbon black and other compounding agents, except for the vulcanization compounding agents, and finally, at a final mixing step, adding thereto the vulcanization compounding agents. |