RUBBER COMPOSITION FOR TIRE TREAD

摘要

PROBLEM TO BE SOLVED: To obtain a rubber composition for tire tread having excellent wet skid performances, rolling resistance and wear resistance. SOLUTION: This tire rubber composition for incompatible tire tread is obtained by compounding 100 pts.wt. of a rubber comprising 40-10 pts.wt. of a modified polybutadiene rubber (BR) modified with a modifying agent of a compound containing a group of the formula -CX-N= (X is an oxygen or a sulfur atom), benzophenone, thiobenzophenone, an isocyanate compound and/or a halogenated tin compound and 50-90 pts.wt. of an unmodified solution polymerization styrene butadiene copolymer rubber with 30-80 pts.wt. of carbon having 70-350 m<2> /g nitrogen specific surface area and >=105-200 ml/100 g DBP oil absorption and 5-60 pts.wt. of wet silica so as to make 40-100 pts.wt. of the total of the carbon and the silica. The modified BR and the unmodified solution polymerization satisfy the relation 0.0002<=χeff -χs <=0.012.