Method for producing solubilized polymer-containing material, and method for producing water-absorbent resin using solubilized polymer-containing material as portion of raw material

Abstract

Provided is a method for producing a solubilized polymer-containing material that makes it possible to efficiently decompose water-absorbent resins to efficiently produce the solubilized polymer-containing material, and provide a method for producing a water-absorbent resin in which a portion of the solubilized polymer-containing material is used as a raw material. The method for producing a solubilized polymer-containing material includes a heat treatment step of heat-treating a mixture containing a water-absorbent resin, water, and a peroxide under conditions satisfying the following i) and ii), in which a mass average molecular weight (Mw) of a water-soluble content of a solubilized polymer-containing material obtained in the heat treatment step is from 30000 to 1000000: i) a solid content concentration of the mixture is 60 mass % or greater, and ii) a temperature of the heat treatment is 60° C. or higher.

Dependencies are inferred from the claim text.