Patent ID: 7220794

Claim:
A rubber composition for tire treads, which comprises (A) 100 parts by weight of a diene rubber comprising at least 35% by weight of a styrene-butadiene rubber, (B) 30 to 50 parts by weight of clay (C) at least 5 parts by weight of silica having a nitrogen absorption specific surface area of 100 to 300 m2/g and (D) at least one part by weight of carbon black having a nitrogen absorption specific surface area of 70 to 300 m2/g, and having a total amount of (B) clay and (C) silica of 40 to 79 parts by weight and a total amount of (B) clay and, (C) silica and (D) carbon black of 41 to 80 parts by weight, wherein (B) clay has an average particle size of 0.5 to 10 μm.