| 摘要 |
PROBLEM TO BE SOLVED: To provide a rubber composition for tire tread, increased in silica dispersibility so as especially to much improve wet performances, by compounding a predetermined amount of a carboxylic acid-modified liquid polyisoprene rubber to a cap tread compound compounded with much silica. SOLUTION: The rubber composition for tire tread is provided by compounding 30-150 pts.wt. reinforcing filler containing≥80 wt.% silica having 100-300 m<SP>2</SP>/g BET specific surface area, and 1-20 pts.wt. liquid polyisoprene having 2-10 carboxy groups per 1 molecule and 10,000-60,000 number-average molecular weight, per 100 pts.wt. diene-based rubber containing≥50 pts.wt. high vinyl, high molecular weight styrene-butadiene copolymer rubber. COPYRIGHT: (C)2009,JPO&INPIT
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