SOLUTIONS DE POLYAMIDES-IMIDES DANS LA GAMMA-BUTYROLACTONE LEUR PROCEDE D'OBTENTION ET LES FILS AINSI OBTENUS.

摘要

Directly shapeable clear solutions of polyamide imides and a method for preparing same are provided. The solutions are obtained by polycondensation in gamma -butyrolactone ( gamma BL) in substantially stoichiometric proportions between toluylene diisocyanate and an aromatic acid anhydride, and by dilution in gamma BL to give a solution allowing them to be processed at a later stage. Yarns and fibres made from said solutions are also described.