Patent ID: 6187853
Filing Date: 2001-02-13
Classification: C08F

Abstract:
A process for producing a water-soluble polymer dispersion comprising polymerizing water-soluble monomers having double bonds in an aqueous salt solution that dissolves the monomers but does not dissolve the formed polymer while stirring in the presence of a dispersant composed of a polymer electrolyte soluble in said aqueous salt solution to obtain fine polymer particles dispersed in the aqueous salt solution, characterized by adding to the polymerization at least one viscosity-increase suppressor selected from the group consisting of:(A) a polyvalent carboxylic acid or a salt thereof,(B) a polyvalent phenol,(C) a cyclic compound containing a hydroxyl group and a carboxyl group or a salt thereof,(D) gluconic acid or a salt thereof,(E) a reaction product obtained by reacting methoxyhydroquinone and/or (meth)acrylic cationic monomer with a compound that generates radicals in an oxidizing atmosphere,(F) a reaction product obtained by reacting (meth)acrylic cationic polymer with a compound that generates radicals in an oxidizing atmosphere,(G) a reaction product obtained by reacting (meth)acrylic cationic polymer with an oxidant, and a mixture thereof.