Patent ID: 7282262

Claim:
A particulate water absorbent, comprising a water absorbent resin in which a polymer obtained by polymerizing an unsaturated monomer has a cross-linking structure therein, wherein: the water absorbent resin is a particulate water absorbent resin which has a cross-linking structure on a surface thereof, and is constituted of particles each of which has a shape other than a shape of a spherical primary particle and a shape of an ellipsoidal primary particle, the particulate water absorbent contains not less than 90 mass % of particles, whose particle diameter is not less than 106 μm and less than 850 μm, with respect to the particulate water absorbent, the particle size distribution of the water absorbent is from 0 to 0.40, and the particulate water absorbent further contains not less than 0.001 mass % and less than 10 mass % of organic acid multivalent metal salt, whose molecule contains not less than seven carbon atoms, with respect to the water absorbent resin, wherein when the particulate water absorbent is immersed in 0.9 mass % of a sodium chloride aqueous liquid under a pressure of 2.06 kPa, an absorbency under pressure is not less than 20 g/g.