Abstract:
PURPOSE: To obtain a dyed paper having excellent fastness to light with a small amount of a fixing agent in a relatively short time without forming a foam by simultaneously adding specific amounts of a specified cationic fixing agent such as diallyldimethylammonium chloride copolymer, etc., and a pigment to a paper stock and dyeing a paper. CONSTITUTION: A pigment and a fixing agent are simultaneously added to a paper stock to be dyed. A paper is dyed by using 0.01-3 wt.% based on a dried paper stock of a cationic fixing agent such as a homopolymer of a diallyldimethylammonium chloride or a copolymer of it and (meth)acrylamide having >=30 K value, a vinylimidazole homopolymer or a copolymer of it and (meth)acrylamide, a vinylimidazoline (co)polymer, a copolymer containing a polymerized vinylamine unit, a copolymer of acrylamide and a 1-4C dialkyl amino(meth)acrylate, a polyethyleneimine, a condensation product of formamide, dicyandiamide, etc.