SPINNING PROCEDURE FOR POLYAMIDE-IMIDES SOLUTIONS BASED ON METAPHENYLENE-DIISOCYANATES AND FIBERS SO OBTAINED.

摘要

THE PRESENT INVENTION REFERS TO A PROCESS FOR OBTAINING PAI FIBERS PER YARN IN PAI SOLUTION AND THE FIBERS SO OBTAINED. THEY ARE OBTAINED BY DRY OR WET YARN IN THE DIMETHYLALKYLENE UREA, AND THEN REMOVAL OF THE SOLVENT AND OVER-STRETCHING AT HIGH TEMPERATURE. THREADS AND FIBERS RESULT FROM PAI BASED ON TOLUILENE OR METAPHENYLENE DIISOCYANATE, AND FROM AN AROMATIC ANHYDRIDE AND / OR AN AROMATIC DIANHYDRIDE, AND EVENTUALLY FROM ONE OR MULTIPLE DIACIDED COMPOUNDS. THEY PRESENT AN EXCELLENT THERMOMECHANICAL BEHAVIOR AND ALLOW ACCESS TO VERY WEAK THREAD TITLES.