| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing a copolymer with a water-soluble monomer having acryloyl group and a water-soluble monomer having a methacryloyl group which has a high molecular weight, good solubility and utility as a polymer coagulant having a small insoluble part and remaining monomer content. SOLUTION: In the method for producing a water-soluble polymer by polymerizing the water-soluble monomer having acryloyl group, the water-soluble monomer having a methacryloyl group, if necessary, a monomer mixture comprising a vinyl based monomer other than the above monomer and an aqueous solution which contains an azo based photopolymerization initiator <=90 deg.C temperature of half-life of 10 hours with light irradiation, after the light irradiation in the first process, light irradiation is further performed at a light irradiation intensity of five times or more of that in the first process at a reaction ratio of all monomer <=95% and a specified reaction ratio.
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