Process for preparing absorbent resin

摘要

A process for preparing an absorbent resin, comprising the step of: polymerizing a hydrophilic unsaturated monomer having at least one carboxyl group using a crosslinking agent which includes a main component at least 90 percent by weight, the main component being an ester having at least two polymerizable unsaturated bonds, wherein: the ester is composed of: a polyhydroxy alcohol having not more than six carbon atoms and at least three hydroxy groups; and an unsaturated carboxylic acid; and a molecule weight ratio of the main component to a standard compound is in the range of from 0.7/1 to less than 1.3/1, the standard compound being an ester composed of: the polyhydroxy alcohol that composes the main component, and the unsaturated carboxylic acid that composes the main component, in which all the hydroxy groups in the polyhydroxy alcohol are ester-linked with the unsaturated carboxylic acid.