| 摘要 |
PROBLEM TO BE SOLVED: To provide a preparation process of a water-soluble polymer having a high molecular weight and a low viscosity, wherein polymerization is easily controlled, and the obtained polymer exerts excellent effects on the paper force and water-filtering property and a high stability against condition fluctuations as an additive for paper-making. SOLUTION: This additive is prepared by copolymerizing (a) from 50 to 99.75 mol% acrylamide and/or methacrylamide, (b) from 0.1 to 20 mol% water- soluble anionic monomer and/or (c) from 0.1 to 20 mol% water-soluble cationic monomer and (d) from 0.05 to 10 mol% methacrylonitrile as constituents.
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