foerfarande foer framstaellning av saodana halvaromatiska polyamider, som innehaoller resten av en eller flera aromatiska dikarboxylsyror och alkylpentametylendiamin.

摘要

The invention relates to a process for the preparation of (co) semiconductor - aromatic polyamide, amorphous or crystalline - on the basis of an acid reactant including at least one aromatic dicarboxylic acid having from 8 to 18 carbon atoms, a reactive amine comprising mainly a alkylpentaméthylenèdiamine and optionally a catalyst. / p & & p & according to this process, polycondensed the reagents by operating in a closed system of the autoclave type according to a protocol including the following steps: step 1 of the distillation of the water present in the reaction mass under autogenous pressure constant, and then a step 2 for decompression to atmospheric pressure and a finishing step 3, in such a way that, on the one hand, water is added at the outset in the reaction mass and, on the other hand, the distillation of step 1 is carried out in particular conditions of temperature (temperature of the start of the distillation t1 between 160 grade (s) and 190 grade (s) c) and of autogenous pressure (between 0,5 and 1,2 mpa). / p & & p & with such a process, the losses in the amine reactant (by concatenation of the distillates and by the cyclization) are significantly reduced.