| abstract |
A water-absorbent resin having high absorption capacity and a slight amount of water-soluble ingredients is produced by a process, which comprises polymerizing a water-soluble monoethylenic unsaturated monomer in the presence of a crosslinking agent, and using a bifunctional compound represented by the following general formula as the crosslinking agent;n wherein R 1 and R 2 are a hydrogen atom or a methyl group independently, and - (X) - is a divalent organic group combined in a straight chain type by an optional arrangement of a structural unit (A) of - (CO - CH = CH - CO - O) l - and 1 = 1 - 5, a structural unit (B) of - (CH 2 CH 2 0) m - and m = 2 - 100, and a structural unit (C) of - (R 3 O) n - and n = 0 - 20, in which R 3 is a C 1 -C 4 alkylene. |