LÖSUNGEN VON POLYAMIDIMIDEN IN GAMMA-BUTRYROLACTON UND DEREN HERSTELLUNGSVERFAHREN

摘要

PCT No. PCT/FR92/01218 Sec. 371 Date Jun. 10, 1994 Sec. 102(e) Date Jun. 10, 1994 PCT Filed Dec. 21, 1992 PCT Pub. No. WO93/13158 PCT Pub. Date Jul. 8, 1993Directly 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 fibers made from said solutions are also described.