| abstract |
(Problem) To provide the manufacturing method of the water absorbing resin which has a large amount of water retention, water absorption under pressurization, a water absorption rate is fast, and there is little water solubility, and can be used suitably for a sanitary material.n n n (Solution) In preparing a water-absorbent resin by reverse-phase suspension polymerization of a water-soluble ethylenically unsaturated monomer, a method for producing a water-absorbent resin which performs reverse phase suspension polymerization in two or more stages, wherein at least one step after the second stage is performed. A method for producing a water absorbent resin, wherein an aminocarboxylic acid compound is added to carry out a polymerization reaction. |