| 摘要 |
PROBLEM TO BE SOLVED: To provide a water-soluble polymer having excellent flocculation performance.SOLUTION: Provided is a water-soluble polymer obtained by a heat treatment of a copolymer, which is composed of acrylamide and acrylonitrile, and a hypervalent iodine compound under an acidic condition, comprising: a structural unit represented by a heterocycle containing nitrogen and having an ammonium salt as a substituent; a structural unit represented by acrylamide; a structural unit represented by acrylonitrile; a structural unit represented by an ammonium salt; and a structural unit represented by a metal carboxylate, wherein a content of the structural unit represented by a heterocycle containing nitrogen and having an ammonium salt as a substituent is 20 mol% or more.SELECTED DRAWING: None |
