| 摘要 |
PURPOSE: To obtain an amphoteric water-soluble polymer dispersion having excellent storage stability and easy flowability by polymerizing a specified monomer mixture in the presence of a soluble high-molecular electrolytic dispersant in an aqueous salt solution in which the formed polymer is insoluble. CONSTITUTION: A monomer mixture essentially consisting of a cationic monomer of the formula (wherein A is O or NH; B is 2 or 3 C alkyl; R1 H or CH3 ; R2 and R3 are each 1 or 2C alkyl; and X<-> is an anionic counter ion) and an anionic monomer is polymerized under agitation in an aqueous slat solution in which the formed polymer is insoluble in the presence of a high-molecular electrolytic dispersant soluble in the slat solution. Thus it is possible to obtain the amphoteric water-soluble polymer dispersion which has excellent storage stability and easy flowability and in which the concentration of the amphoteric water-soluble polymer is 5wt.% or above, the mean particle diameter of the amphoteric water- soluble polymer particles is 0.1-150μm, the viscosity of the dispersion is 10-3000cP, the concentration of the salt in the dispersion is 15wt.% to the saturation concentration, and the concentration of the dispersant is 1-15wt.% based on the amphoteric water-soluble polymer.
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