Patent ID: 7347330
Filing Date: 2008-03-25
Classification: C08J

Abstract:
1. A method for sizing a water-absorbent resin comprising: a) polymerizing at least an acrylic acid or a salt thereof to obtain a water-absorbent resin precursor having an internal cross-linked structure, cross-linking the surface of the resin precursor to obtain surface cross-linked water-absorbent resin particles, and classifying the water-absorbent resin particles and removing aggregates or non-disintegrated coarse particles and fine powder to obtain first sized water-absorbent resin particles, and b) disintegrating aggregates or non-disintegrated coarse particles acquired in step a), classifying the disintegrated product and removing non-disintegrated coarse particles and fine powder, if any, to obtain second sized water-absorbent resin particles, and combining the first sized water-absorbent resin particles obtained from step a) and the second sized water-absorbent resin particles.