| abstract |
The method for producing a polyacrylic acid-based water-absorbent resin powder according to the present invention includes a step of polymerizing a bubble-containing acrylic acid monomer aqueous solution, and a step of drying a hydrous gel crosslinked polymer obtained in the polymerization step, including a surfactant and // Or a bubble generation-containing step of generating and containing bubbles in the acrylic acid-based monomer aqueous solution by decreasing the solubility of the dissolved gas in the aqueous monomer solution in the presence of a dispersant. Accordingly, it is possible to provide a white absorbent resin having improved absorption rate without maintaining or significantly impairing other physical properties (water-permeability, volume specific gravity, surface tension, absorption ratio under pressure, impact resistance, etc.) of the absorbent resin. |