| 摘要 |
PURPOSE:A rubber composition for tire, having low Mooney viscosity, improved processing properties, and improved growth properties of flex-crack resistance, containing a specific rubber reinforced composition, consisting of blended components in a specific ratio. CONSTITUTION:A composition consisting of (A) a rubber reinforced composition wherein 5-100pts.wt. fine thin short fibers of a thermoplastic polymer containing -CONH- group in the polymer are embedded in 100pts.wt. vulcanizable rubber and the polymer is grafted onto the surface of the rubber through a precondensate of a phenol-formaldehyde resin at the interfaces of the fibers, (B) natural rubber and/or polyisoprene, (C) diene rubber except the component B, and (D) 50-70pts.wt. carbon black based on 100pts.wt. total amounts of the rubber components in such a way that an amount of the polymer in the component A is 2-20pts.wt. based on 100pts.wt. total amounts of the rubber components, and total amounts of the rubber in the components A and B are 100-55wt% based on total rubber components, of a vulcanized material having >=30kg/cm<2> modulus at 50%.
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