Patent ID: 7919564

Claim:
A particulate water-absorbing agent obtained by surface-crosslinking, by an organic crosslinking agent which is able to react with a carboxyl group, water-absorbing resin particles, 70 mole % to 100 mole % of which are, as a repeat unit, monomers selected from acrylic acid and/or its salt, the particulate water-absorbing agent satisfying (i) to (iii) below: (i) a surface residual monomer ratio calculated by Formula 1 below being more than 0% but not more than 5%; Surface Residual Monomer Ratio (%)=Amount of Surface Residual Monomers (ppm)/Amount of Residual Monomers (ppm)×100 Formula 1 (ii) a saline flow conductivity (SFC) being 40 (×10 −7 ·cm 3 ·s·g −1 ) or more; and (iii) a water content being less than 5%.