Water-absorbent resin powder and its production process and use

摘要

The present invention provides a water-absorbent resin powder and its production process and use, wherein the water-absorbent resin powder has high liquid permeability, and further, high water absorbency. The production process for a water-absorbent resin powder, according to the present invention, comprises the step of obtaining water-absorbent crosslinked polymer particles by way of an aqueous solution polymerization step, and is characterized by further comprising the step of grinding the resultant crosslinked polymer particles until the bulk density thereof increases to not lower than 0.72 (g/ml). The water-absorbent resin powder, according to the present invention, is characterized by being an arbitrarily pulverized one having a bulk density of not lower than 0.74 (g/ml) and a water absorption capacity of not lower than 20 (g/g) for 0.9 weight % physiological saline under a load of 0.7 psi (4.83 kPa). In addition, the absorbent structure, according to the present invention, is characterized by comprising the above water-absorbent resin powder and a fibrous material. The absorbent article, according to the present invention, is characterized by comprising an absorbent layer including the above absorbent structure.