Stabilized solutions of acrylonitrile polymers and stabilized solvent

Claim 1

AS A NEW COMPOSITION OF MATTER, A STABILIZED SOLUTION OF A POLYMER OF ACRYLONITRILE, CONTAINING IN THE POLYMER MOLECULE AT LEAST 80 PER CENT BY WEIGHT OF ACRYLONITRILE, IN N,N-DIMETHYLACETAMIDE, SAID SOLUTION CONTAINING FROM 0.1 TO 5.0 PER CENT BY WEIGHT, BASED ON THE WEIGHT OF THE N,NDIMETHYLACETAMIDE, OF AN INORGANIC OXYGEN ACID OF PHOSPHORUS. CONSISTING IN FIRST FORMING A PLURALITY OF COMPONENT STRANDS BY COMBINING FOR EACH STRAND A PLURALITY OF CRIMPED INDIVIDUAL FILAMENTS WHICH ARE SUBSTANTIALLY FREE OF TWIST AND TWISTING THE CRIMPED FILAMENTS TOGETHER OF A PREDETERMINED STATE OF BULK AND LOOSENESS, THEN COMBINING A PLURALITY OF SUCH COMPONENT STRANDS AND TWISTING THEM TOGETHER WITH LESS TURNS PER UNIT OF LENGHT THAN THOSE OF THE COMPONENT STRANDS AND IN THE DIRECTION OPPOSITE THERETO, SETTING THE YARN IN SAID TWISTED STATE, AND FINALLY SIZING THE YARN.