METHOD FOR PRODUCTION OF WATER-ABSORBABLE RESIN, AND WATER-ABSORBABLE RESIN PRODUCED BY THE METHOD

摘要

Disclosed is a method for producing a water-absorbable resin, which comprises adding a bisoxetane compound represented by the general formula (1) to a water-absorbable resin precursor produced by the polymerization of a water-soluble ethylenically unsaturated monomer, heating the mixture, and then causing the crosslinking in the heated product. Also disclosed is a water-absorbable resin which is produced by the method, and which has a physiological saline retention ability of 30 g/g or more, a physiological saline absorption ability of 15 ml/g or more under the load of 2.07 kPa and a water solubility of 20 mass% or less. The water-absorbable resin produced by the method has excellent properties including water retention ability and water absorbability under load, and is safe because of its low water solubility and the like. Therefore, the water-absorbable resin can be used suitably for a sanitary product such as a disposable diaper, an incontinence pad and a catamenial pad, particularly a disposable diaper. (1) wherein R represents an alkyl group having 1 to 6 carbon atoms; and n represents an integer of 0 to 6.