Process of making polyvinyl alcohol fibers exhibiting improved dyeability by incorporating therein a water insoluble polymer containing basic nitrogen

Claim 1

IN THE MANUFACTURE OF POLYVINYL ALCHOL FIBERS, THE STEPS WHICH COMPRISE PREPARING AN AQUEOUS SPINNING FLUID COMPRISING A MIXTURE OF POLYVINYL ALCOHOL AND A VINYL ALCOHOL POLYMERIC COMPONENT WHICH IS INSOLUBLE IN SAID SPINNING FLUID AND IS DISPERSED THEREIN IN FINELY-DIVIED FORM OF 0.1 TO 10U IN DIAMETER, SAID POLYMERIC COMPONENT BEING A MEMBER OF THE GOUP CONSISTING OF WATERINSOLUBLE VINYL ALCOHOL HOMOPOLYMERS CONTAINING BASIC NITROGEN AND WATER-INSOLUBLE VINYL ALCOHOL COPOLYMERS CONTAINING BASIC NITROGEN AND COMPOSED PRINCIPALLY OF VINYL ALCOHOL UNIS, SAID COPOLYMERS BEING FORMED FROM A COMONOMER SELECTED FROM THE GROUP CONSISTING OF MONOMERS CONTAINING BASIC NITROGEN, MONOMERS CONTAINING A HALOGEN RADICAL MONOMERS CONTAINING A CYANO GROUP, MONOMERS CONTAINING A CARBONYL GROUP, AND MONOMERS CONTAINING AN ACID AMIDE GROUP, SAID POLYMERIC COMPONENT CONTAINING 0.2 TO 5% OF BASIC NITROGEN, AND SAID POLYMERIC COMPONENT BEING FORMED FROM A POLYMER SELECTED FROM THE GROUP CONSISTING OF A VINYL ALCOHOL HOMOPOLYMER CONTAINING A REACTIVE GROUP AND A VINYL ALCOHOL COPOLYMER COMPOSED PRINCIPALLY OF VINYL ALCOHOL UNITS AND CONTAINING A REACTIVE GROUP, SAID REACTIVE GROUP BEING A MEMBER OF THE CLASS CONSISTING OF HALOGEN, A -CN GROUP, A CARBONYL GROUP, AND AN ACID AMIDE GROUP, AND SAID BASIC NITROGEN BEING INTRODUCED BY CONVERTING SAID REACTIVE GROUP TO BASIC NITROGEN, AND SAID POLYMERIC COMPONENT BEING GIVEN SAID FINELY-DIVIDED FORM BY ACTEALIZING SAID POLYMERIC COMPONENT WITH AN ALDEHYDE CONTAINING NO NITROGEN WHILE AGITATING SAID POLYMERIC COMPONENT IN AN QUEOUS MEDIUM, AND SPINNING SAID FLUID TO FORM FIBERS THEREFROM.