Patent ID: 8252715

Claim:
A water absorbing agent, comprising water absorbent resin particles which are surface cross-linked with a polyhydric alcohol, wherein a compound having (i) a reactive group for a functional group of a surface of each water absorbent resin particle and (ii) a hydrophobic group exists on the surface of the water absorbent resin particle, and the hydrophobic group has a hydrocarbon group whose carbon number is 8 or more, and the compound is represented by the following expression, 13≦(an average carbon number of the hydrocarbon group whose carbon number is 8 or more+the number of primary to tertiary amine nitrogen atoms)≦26 where the amount of primary, secondary, or tertiary amine nitrogen atoms ≧0, a ratio of an oxyalkylene group in a molecular mass of the compound is 0 mass % or more and 25 mass % or less, and at least part of the reactive group bonds to the functional group of the surface of the water absorbent resin particle and/or bonds to the functional group at the time of water absorption; and wherein the saline flow conductivity of the water absorbent resin particles is 10(×10 −7 cm 3 ·s·g −1 ) or more.