process of manufacturing an aqueous solution (a) of salts of diacids and diamine(s)

摘要

process of manufacturing an aqueous solution (a) of salts of diacids and diamine(s) this invention deals with a process of manufacturing a solution of a salt of diacids and diamine(s) for the manufacture of polyamide. This invention deals in particular with a process of manufacturing aqueous solution of the diacid and diamine salts obtained by mixing at least two diacids and at least one diamine, to a concentration by weight of salt between 40 and 70%,which consists of carrying out an aqueous solution of diacid(s) and diamine(s) in a first step with a diacid/diamine molar ratio less than 1 from a clear and a diamine, and in a second step in adjusting the diacid molar/diamine ratio(s) to a value between 0,9 and 1,1, and to fix the concentration by weight of salt by adding another clear and possibly complementary water and/or diamine.