| 摘要 |
PURPOSE:To prevent the lowering of conductivity preventing-ability by composing a tire tread of tire rubber composite substance having low resistivity, and preparing a conductive strip provided extendingly from the surface of a tread strip to its bottom. CONSTITUTION:The central section 3 of a main tire tread strip domain 1 has a width being 15% of tire strip width TR, and two main side domains 4 are provided on both the sides of a tire tread. Rubber composite substance to compose the central domain 3 is rubber blended substance which is reinforced by carbon black and has volumetric resistivity of about 10<6>OMEGA.cm. Rubber composite substance to compose the side domain 4 is rubber blended substance which is reinforced by silica and has volumetric resistivity of about 10<13>OMEGA.cm. Since the tire tread has a conductive strip composed of tire rubber composite substance which is extendingly provided from the surface of the tread strip 1 to its bottom and has low volumetric resistivity of less than 10<8>OMEGA.cm, even in the case where the main section of the tire tread is formed of the rubber composite substance reinforced by the silica, the trouble of charging is not caused.
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