| abstract |
PROBLEM TO BE SOLVED: To develop a dewatering agent for a belt press or a filter-press sludge dewatering agent capable of realizing an agglomerated state with good drainage and filter cloth releasability. Provide a polymerization method for efficiently synthesizing a product that can dissolve a polymer in a short period of time at a high concentration, and provide a method for efficiently dehydrating organic sludge by using an amphoteric polymer dehydrating agent and an inorganic flocculant in combination. . SOLUTION: The methacrylate-based quaternary ammonium base-containing monomer, the acrylate-based quaternary ammonium base-containing monomer, (meth) acrylic acid and mol% of acrylamide are represented by a, b, c and d, respectively. Then, the anion equivalent value in which a and b are set in a specific range, and the ratio c / (a + b) of the total a + b of the cationic monomers and the anionic monomer c is set in the specific ratio, In excess of the equivalent value, a particle size of 100 m produced by a dispersion polymerization method in the presence of a polymer dispersant soluble in the aqueous salt solution in the aqueous salt solution. An amphoteric water-soluble polymer dispersion comprising polymer particles of μ or less. |