| 摘要 |
PURPOSE:To promote resistance of a pneumatic tire against wet-skidding, rolling, breaking by constructing the tread of a composition containing styrene-butadien copolymer rubber satisfying specific conditions simultaneously. CONSTITUTION:A rubber composition composed by mixing 10-120pts.wt. carbon black and 0.5-5pts.wt. vulcanizing agent with 100pts.wt. blend rubber composed of 30pts.wt. or more styrene-butadien copolymer in which combined styrene content in styrene-butadien copolymer 1, 2 combined content and 1, 4 combined content in butadien part and others are selected at fixed values, and which satisfies conditions of 35X10<4>-65X10<4> average molecular weight, 2.3 or less rate between average molecular weight and average molecular number, two or more peaks in a molecular weight distribution curve, and others, and 70 weight part or less other dien rubber. |
