Method for the preparation and use of polyether ester amides with units of the starting components randomly distributed in the polymer chain

摘要

Method for preparing and using thermoplastic polyether ester amides with units of the starting components randomly distributed in the polymer chain. A mixture of: I. one or more polyamide forming compounds from the group of the omega-aminocarboxylic acids and/or lactams having at least 10 carbon atoms; II. an alpha, omega-dihydroxy-(polytetrahydrofuran) having an average degree of polymerization of between about 2 and 42 or a molecular weight of between 160 and 3,000; and III. at least one organic dicarboxylic acid is heated in a weight ratio of I to (II+III) of between 30:7 and 98:2. In (II+III) the hydroxy and carboxy groups are present in equivalent amounts. The heating takes place in the presence of 2-30% by weight of water, based on the polyamide-forming compounds of component I, under the internal pressure attained in a closed container at temperatures of between 230 DEG and 300 DEG C. Water is removed as steam and after removal of the water, the product is further treated at 250 DEG -280 DEG C. with the exclusion of oxygen under normal pressure or under reduced pressure.