| abstract |
Provided is a water-absorbent resin having a better balance of water absorption ratio, liquid permeability, and low dust, and a novel measuring method capable of evaluating the excellent physical properties. The method for measuring the absorption rate of the particulate water absorbent is that a part of the bottom surface is fixed to the bottom surface of the measuring container (51) whose bottom surface is surrounded by a frame, and a part or all of the particulate water absorbent (56) is fixed. Pressurization by the flat plate (52), the aqueous solution is charged from the liquid injection port (54) installed on the flat plate (52), and the time until the charged aqueous solution is absorbed by the particulate water absorbent (56). Is a method of measuring. |