| abstract |
The method for producing a polyacrylic acid-based water-absorbent resin powder according to the present invention comprises a step of polymerizing an acrylic acid-based monomer aqueous solution containing bubbles, and a water-containing gel-like crosslinked polymer obtained in the polymerization step is dried. Generating a bubble in the acrylic monomer aqueous solution by reducing the solubility of the dissolved gas in the monomer aqueous solution in the presence of a surfactant and / or dispersant. Including a containing step. As a result, a white water-absorbing resin with an improved water absorption speed can be obtained without maintaining or greatly damaging other physical properties of the water-absorbing resin (liquid permeability, bulk specific gravity, surface tension, water absorption capacity under pressure, impact resistance, etc.). Can be provided. |