POLY (METH) ACRYLIC ACID (SALT) GRANULAR WATER ABSORBENT AND METHOD FOR PRODUCING SAME

摘要

[Problem] To provide a disposable diaper in which, regardless of the concentration of water absorbent in the absorbent article and the configuration thereof, the liquid return quantity is reduced, and liquid can be captured at an excellent speed. [Solution] While adjusting the absorption factor and surface tension of the water absorbent to within specific ranges, the water-containing gel-form cross-linked polymer obtained in the polymerization step is crushed to a specific weight-average particle diameter, and after drying has a liquid permeability improver added during or after surface crosslinking, thereby obtaining a water absorbent with excellent GCA (Gel Capillary Absorption) and FGBP (Free Gel Bed Permeability).