| 摘要 |
PURPOSE:To obtain the titled linear polymer having high molecular weight, without causing gelling during the reaction, by using a catalyst produced by supporting an alkali metal fluoride on an. organic polyvalent isocyanate and an organic polybasic carboxylic acid (anhydride). CONSTITUTION:The objective polymer can be produced by using a catalyst prepared by supporting an alkali metal fluoride (preferably KF or CeF) on an organic polyvalent isocyanate, an organic polybasic carboxylic acid and/or an organic polybasic carboxylic acid anhydride. The objective polymer is preferably produced by reacting an organic diisocyanate with an organic dicarboxylic acid, an organic diisocyanate with an organic tricarboxylic acid or tricarboxylic acid anhydride, or an organic diisocyanate with an organic tetracarboxylic acid or tetracarboxylic acid dianhydride.
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