Process for spinning from solution of polyamide-imides (PAI) based on tolylene or meta-phenylene diisocyanates and fibers thus obtained

摘要

The present invention relates to a process for obtaining PAI fibers by spinning PAI in solution and to the fibers thus obtained.;They are obtained by dry or wet spinning into dimethylalkyleneurea followed by removal of the solvent and overdrawing at high temperature.;The yarns and fibers obtained are produced from PAI based on tolylene or meta-phenylene diisocyanate, and on an aromatic acid anhydride and/or an aromatic dianhydride, and optionally on one or a number of diacid compounds.;They exhibit an outstanding thermomechanical behavior and make it possible to gain access to very low linear densities.