| abstract |
(57) [Summary] [Purpose] A water-absorbing agent suitable for sanitary materials, which has a high absorption capacity even under pressure, has a high reactivity without leaving a highly reactive crosslinking agent, and is suitable for sanitary materials. Provide a way. [Structure] A water-absorbent resin having a carboxyl group is mixed with at least one additive selected from the group consisting of an inorganic acid and an organic acid and a crosslinking agent capable of reacting with a carboxyl group. |