MANUFACTURING METHOD OF POLYMER COAGULANT

摘要

PROBLEM TO BE SOLVED: To provide a manufacturing method of a polymer coagulant of a nonionic or anionic water-in-oil type emulsion which is excellent in long-term stability, exhibits preferable polymerization property and hardly forms coagulum or insoluble content.SOLUTION: A method for manufacturing a polymer coagulant by performing a water-in-oil type emulsion polymerization of a monomer mixture which does not contain a cationic monomer and contains a nonionic monomer and/or anionic monomer under existence of a surface active agent adjusted such that a weighted average of HLB values of respective surface active agents fall into the range of 4.0 to 8.0 by mixing at least two kinds of different HLB values is provided. Therein, the monomer mixture contains bifunctional monomer which is methylene bis-acrylamide or di(meth)acrylate and the nonionic monomer is (meth)acryl amide and the anionic monomer is (meth)acrylic acid (salt) and/or 2-acryl amide-2-methyl propane sulfone acid (salt).SELECTED DRAWING: None