| abstract |
The present invention provides a water absorbing agent which maintains excellent water absorbing properties for a long time, even when urine composition of human urine varies depending. A particulate water absorbing agent comprising a water-absorbing resin obtained by crosslinking polymerization of an unsaturated monomer, which exhibits Centrifuge retention capacity in a physiological saline solution of not lower than 32 g/g, mass median particle size (D50) of 200 to 400 µm, ratio of particles with diameter of smaller than 150 µm of 0 to 2% by weight, and increased extractables by deterioration of 0 to 15% by weight. |