| abstract |
PROBLEM TO BE SOLVED: To improve the function of a cationic or amphoteric water-soluble polymer as a flocculant, and to disperse the water-soluble polymer in a salt aqueous solution in the presence of a polymer dispersant soluble in the salt aqueous solution. We develop a method for producing by a method and efficiently producing in a stable dispersion state, and a paper making method using this water-soluble polymer. SOLUTION: A reduced viscosity ηsp / c (unit: dl / g) is represented by an equation of ηsp / c = [η] + k × c (where c is a polymer concentration, a unit is g / dl, and [η] is an intrinsic viscosity) ), A water-soluble polymer having a coefficient k value of 20 or less, a cationic water-soluble monomer, and optionally an anionic monomer, (meth) acrylamide and other copolymerizable polymers To produce a stable dispersion by a dispersion polymerization method in which a water-soluble monomer (mixture) composed of a nonionic water-soluble monomer is coexisting in a salt aqueous solution with a polymer dispersant capable of being added to the salt aqueous solution. Can do. In addition, a paper having good formation can be made as a yield improver and / or a freeness improver. [Selection figure] None |