| 摘要 |
PROBLEM TO BE SOLVED: To obtain a tire tread rubber composition for passenger cars and small trucks, capable of simultaneously achieving a low fuel cost property in a tanδregion of <=0.1 at 60 deg.C and all of wet performance, abrasion resistance performance, durability and electric conductivity at high levels. SOLUTION: This rubber composition comprises 100 pts.wt. of a rubber component containing natural rubber or polyisoprene rubber in an amount of at least 40 pts.wt., >=40 pts.wt. of silica, 2.0-12.0 pts.wt. of a nonionic surfactant, and a silane coupling agent in an amount of 5-25 pts.wt. based on that of the silica, and has a silica BET-adsorption amount of 150-240m<2> /g. The rubber composition further has a dissociation factor (tanδ) of <=0.10 measured at a temperature of 60 deg.C after vulcanized, a dynamic storage elastic modulus (E') of >=5.0×10<7> dyn/cm<2> measured at the same temperature, and a fracture energy (TF) of >=100 at 100 deg.C.
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