| 摘要 |
PURPOSE:To efficiently manufacture a denatured rubber excellent in green strength in uncured state, posture fatigue resistance, resiliency, etc., useful for tires, etc., by the reaction, in the presence of a Lewis acid, of glyoxylic anhydride with unsaturated carbon bond-carrying rubber. CONSTITUTION:An unsaturated carbon bond-carrying rubber (e.g. natural rubber, guayule rubber, polyisoprene rubber, styrene-butadiene rubber) is made to react, in the presence of a Lewis acid [e.g. SnCl4, BF3O(C2H5)2, TiCl4], with pref. 0.01-5pts.wt., per 100pts.wt. of said rubber, of glyoxylic anhydride, pref. at -10-60 deg.C for 10sec-10hr, thus performing the objective rubber modification. The amount of said Lewis acid to be used is pref. 0.05-2mol per mol of the glyoxylic anhydride.
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