Patent ID: 6376587
Filing Date: 2002-04-23
Classification: B60C,C08K,C08L,Y02T

Abstract:
A rubber composition for a tire tread comprising:per 100 parts by weight of a diene based rubber component containing at least 50 parts by weight of styrene-butadiene rubber, (1) 5 to 50 parts by weight of carbon black having a nitrogen absorption surface area of from 90 to 180 m2/g and an oil-absorbing amount of dibutylphthalate of from 100 to 170 ml/100 g; (2) 5 to 50 parts by weight of silica, (3) wherein the total amount of said carbon black and silica is from 30 to 90 parts by weight; and (4) 5 to 20% by weight of a silane coupling agent relative to said blended amount of silica; (5) 1 to 15 parts by weight of a thermoplastic phenol resin; and (6) 5 to 20% by weight of hexamethylenetetramine relative to the blended amount of resin, wherein tan &dgr; at 60Â° C. of said rubber composition is &lE;0.14, tan &dgr; at 0Â° C. of said rubber composition is &gE;0.50, dynamic modulus Eâ€² at 30Â° C. of said rubber composition is &gE;1.2Ã—107 pa, and tensile stress at the time of extending 300% at 25Â° C. of said rubber composition is &lE;9.5 Mpa.