Method for producing artificial fibers containing microcapsules

Claim 1

IN A METHOD FOR PRODUCING ARTIFICIAL FIBERS CONTAINING MICROCAPSULES OF A FIBER MODIFIER SELECTED FROM THE GROUP CONSISTING OF SANITARY PROCESSING AGENTS, FLAME RESISTANT AGENTS, LUMINOUS SUBSTANCES, DEODORANTS, SOFTENING AGENTS, PERFUMES, ANTISTATIC AGENTS, ANTIOXIDANTS AND U.V. ABSORBERS, BY EXTRUDING A SPINNING SOLUTION CONTAINING THE MICROCAPSULES IN A FINELY DISPERSED STATE, A FIBER FORMING POLYMER SELECTED FROM THE GROUP CONSISTING OF POLYAMIDES, POLYESTERS, POLYVINYL CHLORIDE, POLYVINYL ALCOHOL, POLYACRYLONITRILE, COPOLYMERS OF ACRYLONITRILE WITH ONE OR MORE OTHER VINYL MONOMERS AND CELLULOSE ACETATE, AND A SOLVENT FOR THE POLYMER, THE IMPROVEMENT WHEREIN THE SPINNING SOLUTION CONTAINING THE MICROCAPSULES IS PREPARED BY FINELY DISPERSING IN THE SPINNING SOLUTION THE FIBER MODIFIER WHICH IS INCOMPATIBLE WITH THE SPINNING SOLUTION AND A FILM-FORMING SUBSTANCE SOLUBLE IN THE SPINNING SOLUTION OR FIBER MODIFIER, AND FORMING A FILM INSOLUBLE IN THE SPINNING SOLUTION ON THE SURFACE OF THE DISPERSED PARTICLES OF THE FIBER MODIFIER TO FORM MICROCAPSULES ENCLOSING THE FIBER MODIFIER THEREIN.