| 摘要 |
PURPOSE:To improve air permeability by using as inner liner a rubber composit made of carbon black and micro organic short fiber of specific ratio combined with rubber mainly consisting of halogen butyl rubber. CONSTITUTION:A desired rubber composit is obtained blending 10-100pts.wt. of carbon black and 3-10pts.wt. of micro short fiber with 100pts.wt. of butyl rubber and/or halogenated butyl rubber or 50pst.wt. or more of butyl rubber, and/or halogenated butylrubbes and 100pts.wt. of blended rubber or less than 50pts.wt. of diene rubber. The composition is used liner. The glass transition temperature of an amorphour portion of the above shor fibe is lower than 30 deg.C or higher than 120 deg.C and melting point of crystal portion is higher than 160 deg.C. The average length of the short fiber to be used is 0;8- 30mum and the diameter 0.02-0.8mum, and the diameter 0.02-0.8mum, the ratio of the length to the diameter being 8-400. |
