Patent ID: 8084544

Claim:
A process for preparing a water-absorbent resin having a water-retention capacity of 0.9% by weight physiological saline of 40 g/g or more and a water absorption capacity of 0.9% by weight physiological saline under a pressure of a 4.14 kPa load of 15 ml/g or more, said process comprising carrying out a reversed phase suspension polymerization in multi-steps of two or more steps of subjecting a water-soluble ethylenically unsaturated monomer to the reversed phase suspension polymerization to prepare the water-absorbent resin, wherein an aminocarboxylic acid compound is added to at least one step in the second and subsequent steps to carry out the polymerization reaction to control self-crosslinking generated upon polymerization of the water-soluble ethylenically unsaturated monomer, whereby gel strength is fortified without lowering water absorption capability.