Water-absorbing agent and process for producing the same

An absorbing agent, which comprises:

• an oxetane compound and/or an imidazolidinone compound;
• and a water-absorbent resin, where said water-absorbent resin is selected from the group consisting of crosslinked poly(acrylic acids) and partially or entirely neutralized product thereof, hydrolyzed copolymers of starch-acrylonitrile, neutralized graft polymers of starch-acrylic acid, saponified copolymers of vinyl acetate-acrylic acid ester, hydrolyzed copolymers of acrylonitrile or acrylamide, crosslinked polymers of hydrolyzed copolymers of acrylonitrile or acrylamide, crosslinked polyvinyl alcohols having a carboxyl group, and copolymers of crosslinked isobutylene-maleic anhydride.

An absorbing agent, which comprises a water-absorbent resin crosslinked with an oxetane compound and/or an imidazolidinone compound, where said water-absorbent resin is selected from the group consisting of crosslinked poly(acrylic acids) and partially or entirely neutralized product thereof, hydrolyzed copolymers of starch-acrylonitrile, neutralized graft polymers of starch-acrylic acid, saponified copolymers of vinyl acetate-acrylic acid ester, hydrolyzed copolymers of acrylonitrile or acrylamide, crosslinked polymers of hydrolyzed copolymers of acrylonitrile or acrylamide, crosslinked polyvinyl alcohols having a carboxyl group, and copolymers of crosslinked isobutylene-maleic anhydride.

A process for producing a water-absorbing agent comprising:

• crosslinking a water-absorbent resin with a crosslinking agent, said crosslinking agent comprising at least one compound selected from the group consisting of an oxetane compound having at least one oxetane skeleton per molecule, an imidazolidinone compound having at least one imidazolidinone skeleton per molecule, and mixtures thereof, where said water-absorbent resin is selected from the group consisting of crosslinked poly(acrylic acids) and partially or entirely neutralized product thereof, hydrolyzed copolymers of starch-acrylonitrile, neutralized graft polymers of starch-acrylic acid, saponified copolymers of vinyl acetate-acrylic acid ester, hydrolyzed copolymers of acrylonitrile or acrylamide, crosslinked polymers of hydrolyzed copolymers of acrylonitrile or acrylamide, crosslinked polyvinyl alcohols having a carboxyl group, and copolymers of crosslinked isobutylene-maleic anhydride.