| abstract |
The present invention provides: a water-absorbent resin powder, whichnincludes no fine metallic foreign substance, and in which the deterioration isnsuppressed; its production process; and uses. n The present invention production process for a water-absorbent resin powderncomprises the steps of: polymerizing an unsaturated monomer; and drying thenresultant crosslinked hydrogel polymer, wherein the water-absorbent resin powdernhas a crosslinked structure and a mass-average particle diameter of 300 to 600 µmnwherein the ratio of fine particles having particle diameters of not larger than 150 µmnis less than 10 mass % of the water-absorbent resin powder, with the productionnprocess being characterized by further comprising a magnetic-flux irradiation step ofnpassing a magnetic field having a magnetic flux density of not less than 0.05 Wb/m 2 nthrough the water-absorbent resin powder after the drying step in the productionnprocess. |