Process for preparing filaments from dispersions containing graft polymers obtained from ethylenically unsaturated monomers

Claim 1

THE PROCESS OF PREPARING FILAMENTS WHICH COMPRISES FORMING A DISPERSION OF A POLYMER IN PARTICULATE FORM BY POLYMERIZING AN ETHYLENICALLY UNSATURATED MONOMER IN AN AQUEOUS MEDIUM, ADDING TO THE SAID DISPERSION AFTER POLYMERIZATION OF THE MONOMER IS SUBSTANTIALLY COMPLETE BUT WHILE THE RESULTANT POLYMER IS STILL IN THE NASCENT STATE, A SECOND ETHYLENICALLY UNSATURATED MONOMER TO OBTAIN A PARTICULATE DISPERSION OF A COPOLYMER OF THE TWO SAID MONOMERS, ADDING TO THE RESULTANT DISPERSION A SETTABLE MATRIX-FORMING MATERIAL WHICH IS SOLUBLE IN THE SAID DISPERSION, EXTRUDING THE DISPERSION THROUGH A SPINNERET INTO A MEDIUM WHICH PRECIPITATES THE SAID MATRIX-FORMING MATERIAL BY RENDERING IT INSOLUBLE, AND THEREAFTER COALESCING THE PARTICLES OF THE COPOLYMER EMBEDDED IN THE MATRIX-FORMING MATERIAL BY CONTACTING THE SAME WITH A FLUID WHICH HAS A SOLVENT ACTION ON THE COPOLYMER PARTICLES.