Abstract: An anti-corrosive agent for washing of a metal with an acid, which comprises an amphoteric polymeric compound (P) having at least one cationic constituent unit (A) having a specific structure, at least one anionic constituent unit (B) having a specific structure and a specific sulfur-containing constituent unit (C).

Abstract: Provided is a process for producing a copolymer of a diallylamine and sulfur dioxide which copolymer has a higher molecular weight and water-solubility than that obtained by a conventional production process by copolymerizing the diallylamine and sulfur dioxide in the presence of an acid and a radical polymerization initiator in a polar solvent.

Abstract: Provided is a process for producing a copolymer of diallyldialkylammonium salt and a maleic acid which copolymer is free of residual monomers and polymerization initiator and hence stably exhibits excellent performances in various uses, and the process comprises polymerizing a monomer mixture comprising diallyldialkylammonium salt and maleic acid in the presence of persulfate as a radical polymerization initiator in water or a polar solvent, and completion of the polymerization-reaction, decomposing the radical polymerization initiator to produce a copolymer comprising diallyldialkylammonium salt constituent unit and a maleic acid constituent unit.

Abstract: Provided is a method for producing a diallylamine acetate polymer comprising polymerizing diallylamine acetate in water or a polar solvent in the presence of a radical initiator, the radical initiator being an organic acid addition salt of a specific cyclic amidinoazo compound, and a diallylamine acetate polymer solution free of halogen.

Abstract: Provided is a process for producing a copolymer of a diallylamine and sulfur dioxide which copolymer has a higher molecular weight and water-solubility than that obtained by a conventional production process by copolymerizing the diallylamine and sulfur dioxide in the presence of an acid and a radical polymerization initiator in a polar solvent.

Abstract: An anti-corrosive agent for washing of a metal with an acid, which comprises an amphoteric polymeric compound (P) having at least one cationic constituent unit (A) having a specific structure, at least one anionic constituent unit (B) having a specific structure and a specific sulfur-containing constituent unit (C).

Abstract: Provided is a method for producing a diallylamine acetate polymer comprising polymerizing diallylamine acetate in water or a polar solvent in the presence of a radical initiator, the radical initiator being an organic acid addition salt of a specific cyclic amidinoazo compound, and a diallylamine acetate polymer solution free of halogen.

Abstract: Provided is a process for producing a copolymer of diallyldialkylammonium salt and a maleic acid which copolymer is free of residual monomers and polymerization initiator and hence stably exhibits excellent performances in various uses, and the process comprises polymerizing a monomer mixture comprising diallyldialkylammonium salt and maleic acid in the presence of persulfate as a radical polymerization initiator in water or a polar solvent, and completion of the polymerization-reaction, decomposing the radical polymerization initiator to produce a copolymer comprising diallyldialkylammonium salt constituent unit and a maleic acid constituent unit.

Abstract: Provided is an industrially advantageous process for producing allylamine polymers from various allylamines in an organic solvent with ease and at high yields, and the process comprises polymerizing allylamines in a medium containing an organic solvent in the presence of an azo compound selected from azo compounds of the formulae (I) and (II), wherein symbols are as defined in the specification.