Patent ID: 9138722
Filing Date: 2015-09-22
Classification: A61L,B01J,C08F,C08L

Abstract:
1. A method for producing water-absorbent resin particles, comprising a step that includes carrying out reversed-phase suspension polymerization of a water-soluble ethylenically unsaturated monomer in a suspension containing a surfactant that comprises a fatty acid ester of sorbitan, sorbitol or a derivative thereof, and a hydrocarbon dispersion medium, wherein the fatty acid ester includes a lauric acid ester and at least one kind of other ester selected from the group consisting of palmitic acid esters, stearic acid esters and behenic acid esters, and in a GPC chromatogram obtained from the fatty acid ester, the proportion of the peak area due to the lauric acid ester is 30-60% and the proportion of the total peak area due to the other ester is 10-50%, based on the total peak area due to the fatty acid esters.