PURPOSE: The titled copolymer excellent in fastness to chlorine, washing and light and useful as a dye fixing agent, prepared by polymerizing a specified allylamine salt with a specified diallylamine salt.
CONSTITUTION: A solution obtained by dissolving 20W90wt% mixture of an allylamine salt (A) of formula I (wherein X is a counter ion of an acid, such as Cl or PO4), a diallylamine salt (B) of formula II (wherein R1W4 are each H or methyl), e.g., diallylamine sulfate, in an amount providing an A/B molar ratio of 95W5/5W95 and, optionally, (C) another copolymerizable monomer (e.g., vinylpyrrolidone) in a solvent (e.g., water) is copolymerized at 30W100°C in the presence of 0.1W20wt%, based on said mixture, radical polymerization initiator (e.g., ammonium persulfate) to obtain a dye fixing agent comprising the titled copolymer. A piece to be dyed is immersed in a treating liquor containing 0.1W2wt% this fixing agent and dyed at normal temperature W 80°C and a liquor ratio of 1:10W20 for 5W20min.
SAKA TERUMASA
YAMATO HIDEO
KONDO NORIO
