METHOD OF PREPARING STAINED MODACRYLYC FIBER Russian patent published in 1995 - IPC

FIELD: textile industry. SUBSTANCE: stained modacrylic fiber is prepared by addition of cationic dye, for example, in mixture of water and 70-90% acetone to spinning solution of acrylic copolymer before spinneret. Dye solution is mixed with spinning solution in the mixer fitted before spinneret at the volume ratio 1:(15-30). Acrylic copolymer source is copolymer consisting of 35-70 wt. -% acrylonitrile and 30-65 wt.-% vinyl chloride and/or vinylidene chloride and other vinyl monomers. For preparing fiber of different color a few cationic dye solutions and the same number of spinnerets were used. Method ensures to eliminate spinneret stoppage with actylic copolymer residues. EFFECT: improved method of fiber preparing. 3 cl, 6 tbl