| abstract |
The present invention provides a water absorbing agent with a small fluctuation in the feeding amount of the feeder. The water-absorbing agent is mainly composed of a water-absorbing resin, and satisfies (a) a K-index of 70 or more, and (b) a moisture absorption blocking ratio of 70 after standing at 25° C. and a relative humidity of 80% RH for 30 minutes. % by weight or less, wherein the above K-index is defined as: 100-(-438+3.6×angle of repose+3.5×angle of difference+7.9×compression ratio+290×bulk bulk density (EDANA method)). |