| 摘要 |
PURPOSE:To provide the titled crosslinkable prepolymer, capable of giving cured products of water resistance, having on one side a side chain with its end carrying C=C double bond and on the other side, a side chain carrying perfluoroalkenyloxy chain. CONSTITUTION:The objective prepolymer containing pref. >=10wt.% of recurring units of formula I (X is 6-14C perfluoroalkenyl group), with an average molecu lar weight 3,000-10,000 and iodine value 25-80 in general. Recurring units other than that of the formula I are, e.g., of vinyl acetate, methacrylamide, maleic anhydride. This prepolymer can be obtained by either homopolymerization of a fluorine-contg. dicarboxylic acid diallyl ester or by copolymerization of said ester with copolymerizable component(s) such as ethyl ene and/or isoprene. Even the prepolymer containing >=50wt.% of the recurring units of the formula I has a water absorption rate of 1/10.
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