发明名称 Pneumatic tyre
摘要 <p>A pneumatic tyre has a tread portion (2) comprising a tread cap rubber (15) defining the tread face and a tread base rubber (16) disposed radially inside the tread cap (15). The tread base rubber (16) comprises a collector part (17) which is disposed radially inside the tread cap rubber, and discharge terminal parts (14) each of which extends radially outwardly from the collector part to the tread face, penetrating the tread cap rubber. The tread cap rubber is made of an insulation rubber material whose volume resistivity is not less than 1X10<8> ohm cm. The insulation rubber material is compounded from: 100 parts by weight of a rubber base comprising one or more materials selected from diene rubber and copolymers of a conjugated diene monomer and an aromatic vinyl compound; 30 to 100 parts by weight of silica; and 3 to 20 parts by weight of carbon black. The tread base rubber is made of a first electrically conductive rubber material whose volume resistivity is not more than 1X10<7> ohm cm. The first electrically conductive rubber material compounded from: 100 parts by weight of a rubber base comprising one or more materials selected from diene rubber and copolymers of a conjugated diene monomer and an aromatic vinyl compound; 0 to 50 parts by weight of silica; and not less than 25 parts by weight of carbon black. The hardness Hs1 of the insulation rubber material is not more than the hardness Hs2 of the first electrically conductive rubber material at a temperature of 25 degrees C. <IMAGE></p>
申请公布号 EP0847880(A1) 申请公布日期 1998.06.17
申请号 EP19970308164 申请日期 1997.10.15
申请人 SUMITOMO RUBBER INDUSTRIES LIMITED 发明人 MATSUO, TOSHIO;NAKAGAWA, YOSHIKI
分类号 B60C11/18;B60C19/08;(IPC1-7):B60C19/08 主分类号 B60C11/18
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