| abstract |
(57) [Summary] [Object] To provide a method for producing a particulate hydrogel polymer having a high water absorption capacity and a low water-soluble content, and a water-absorbent resin. In a method for producing a particulate hydrogel polymer in which a hydrogel polymer having a crosslinked structure is subjected to shearing force to be subdivided into particles in a container, the container has a plurality of rotary stirring shafts. In the kneader having the above, a member is provided over substantially the entire surface thereof, and the member is rotated from the spatial volume formed by the rotation of the rotary arm of the rotary stirring shaft to the rotary stirring shaft and the rotation. Substantially 1.0 times the volume of the remaining space (effective shearing volume) V 1 after subtracting the volume of the arm, and more than 1.8 times the volume V 0 of the hydrous gel polymer, to 4.0 times or less. According to the method for producing a particulate hydrogel polymer characterized in that the hydrogel polymer heated at a temperature of 40 to 110 ° C. is repeatedly subjected to a shearing force. |