Patent ID: 6489389
Filing Date: 2002-12-03
Classification: B60C,C08K

Abstract:
A rubber composition for tire tread comprising a rubber component containing at least 70 parts by weight of a styrene-butadiene rubber whose styrene content is 20 to 60%; and comprising, based on 100 parts by weight of the rubber component,5 to 150 parts by weight of a powdery inorganic compound represented by the following formula (I) and having a particle size from 0.01 to 10 &mgr;m: mM1â€¢xSiOyâ€¢zH2Oâ€ƒâ€ƒ(I) in which M1 is at least one metal selected from the group consisting of Ti and Ca; any oxide of any one of the metals; or any hydroxide of any one of the metals, and m, x, y, and z are integers from 1 to 5, 0 to 10, 2 to 5, and 0 to 10, respectively, or M1 is at least one metal selected from the group consisting of Al and Mg; any oxide of any one of the metals; or any hydroxide of any one of the metals; and m, x, y, and z are integers from 1 to 5, 0, 2 to 5, and 0 to 10, respectively, and 5 to 170 parts by weight of carbon black having a nitrogen adsorption specific area of 80 to 280 m2/g so that the total amount of the powdery inorganic compound and the carbon black falls in the range of 70 to 200 parts by weight, wherein the amount of an extract obtained when extracting the rubber composition, after being vulcanized, with acetone and chloroform is 30 to 270 parts by weight, based on 100 parts by weight of the rubber component.