| 摘要 |
PURPOSE:To provide a rubber composition having high rolling resistance and wet-grip performance, also of good processability, comprising a specific butadiene or styrene-butadiene rubber prepared by solution polymerization. CONSTITUTION:The objective composition comprising a butadiene or styrene- butadiene rubber prepared by solution polymerization, or, consisting mainly of an elastomer having a glass transition temperature >=-50 deg.C, with >=70wt% molecular chains crosslinked through tri-or tetrafunctional bonding agent. Said rubber component should have an intrinsic viscosity of 1.0-6.0 (pref. 1.0-4.0) (measured in the form of toluene solution at 30 deg.C). Said bonding agent is pref. of tetrafunctional type, e.g., silicon tetrachloride or tin tetrachloride. Incorporation of less than 30pts.wt. of natural or synthetic isoprene rubber based on 100pts.wt. of the total rubber component will result in highly balanced characteristics of the composition.
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