| 摘要 |
PURPOSE:To enhance the braking ability on a slipable road surface and durability of a tire having two layer structure tread section, by providing such an arrangement that an inner surface side rubber layer which if formed by specifying rubber compositions and characteristics is arranged such that it will not be exposed to the outer surface of the tire until tire slip marks are exposed. CONSTITUTION:An inner surface side rubber layer 2 having a loss tangenet of less than 0.2 at 50 deg.C and a tensile product of 3.0X10<4>%kg/cm<2> at 100 deg.C is formed with the use of, for 100pts.wt. of rubber component, 20-80pts.wt. of natural rubber and/or synthetic polyisoprene rubber, 80-20pts.wt. of styrene butadiene coplymer rubber and/or polybutadiene rubber containing more than 10pts.wt. of strene butadiene copolymer rubber and/or polybutadiene rubber in which more than one atomic groups havin specific structures are coupled to molecular chains by carbon-carbon coupling, and 25-70pts.wt. of carbon black having an I2 absorption amount of 50-128g/kg. Further, the inner surface side rubber layer 2 is arranged such that it will not be exposed to the outer surface of the tire until slip marks are exposed to the outer surface of the tire. With this arrangement the braking ability on a slipable road surface and the durability against repetitive turns may be enhanced. |
