| abstract |
PURPOSE: To provide the title compsn. which prevents the degradation of durability of a tire caused by heat buildup during high-speed running without detriment to the grip of the tire. n CONSTITUTION: 100 pts.wt. rubber component comprising at least one styrene- butadiene copolymer rubber having a combined styrene content of 30 % or higher, 70 pts.wt. or higher carbon black having an iodine adsorption capacity of 90 mg/g or higher, and 1-15 pts.wt. calcium oxide are compounded to give the title compsn., which has an improved heat resistance without detriment to the grip. n COPYRIGHT: (C)1992,JPO&Japio |