This improves the to prepare copolyamides from isophthalic acid impure, by polycondensation

摘要

P improved process for the preparation of transparent thermoplastic polyamides by polycondensation of an aqueous solution at a concentration of 50 to 85% by weight of salts of isophthalic acid, hexamethylenediamine and (-) - alkanes (4aminocyclohexym. / p & & p & use is made of an acid, isophthalic acid, which contains up to a 1,6% by weight of impurities in order to form the salts of hexamethylenediamine and bis - (4 - aminocyclohexyl) - alkanes and these salts are subjected to polycondensation without isolating them or to purify. / p & & p & the process according to the invention affords savings obvious without a reduction in the quality of the products obtained. / p