| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for industrially and efficiently producing a powdery cationic water-soluble polymer of good quality with a low content of remaining gel. SOLUTION: The method for producing the powdery cationic water-soluble polymer comprises carrying out aqueous solution polymerization of a monomer mixture containing acrylamide and a monomer represented by structural formula (1) (wherein, R<SB>1</SB>, R<SB>2</SB>and R<SB>3</SB>represent each independently H, a methyl group, ethyl group or benzyl group; R<SB>4</SB>represents H or a methyl group; and X represents Cl<SP>-</SP>, Br<SP>-</SP>or 1/2SO<SB>4</SB><SP>2-</SP>) and then drying the produced polymer. The method for producing the powdery cationic water-soluble polymer comprises conducting the drying at a temperature (T°C) represented by the following numerical formula: 10A+45≤T≤10A+70 äwherein, T represents the drying temperature (°C); and A represents a pH value of the monomer mixture}. COPYRIGHT: (C)2008,JPO&INPIT |
