| 摘要 |
PURPOSE:To improve wear-proofness and chipping-proofness by onstituting that volume expansion ratio of tire trea rubber of non-running times is within a predetermined range. CONSTITUTION:Volume expansion ratio of tire tread rubbder of non-running time after 48hr soaking in toluene at a temperature of 35 deg.C is made to be 240- 340% by rubber composition having natural rubber, synthetic polyisoprene rubber or mixture rubber of them and mixed with 50-60phr of carbol. By this, wear- proofness and chipping-proofness can be improved. |
