Patent ID: 7960469

Claim:
A water absorbent resin composition, comprising: a particulate water absorbent resin (A) having a cross-linking structure obtained by polymerizing an unsaturated monomer containing an acid group, said particulate water absorbent resin (A) having a cross-linked surface, wherein the water absorbent resin composition contains 95 wt % or more of particles whose particle diameter is less than 850 μm and not less than 106 μm, and a weight average particle diameter of the particles is less than 500 μm and not less than 300 μm, and a logarithmic standard deviation (σζ) of a particle size distribution of the water absorbent resin composition is 0.45 or less, and a water-soluble component of the water absorbent resin composition is 5 wt % or more and 35 wt % or less, the water-soluble component being a value obtained by measuring an amount of the water-soluble component in a water-soluble component extract solution in which the water-soluble component of the water absorbent resin composition is extracted, the water-soluble component extract solution being prepared by adding the water absorbent resin composition to a saline and stirring the mixture thus obtained; and a multivalent metal component, wherein an extraction rate of the multivalent metal component around the surface of said particulate water absorbent resin is 7.6 wt % to 14.8 wt %.