Arakawa Kagaku Kogyo Kabushiki Kaisha

Nobuyuki Oshima

Shozo Tanioku

Kiyoshi Sato

Jun-ichi Maeno

This invention provides a process for preparing a water-absorbing resin which comprises the steps of mixing powder of an inorganic inactive substance with a water-absorbing resin having carboxylate-containing monomer units, and adding water and a high molecular-weight cross-linking agent to the mixture to perform cross-linking reaction and evaporation of water, the cross-linking agent being selected from a specified copolymer (1) and a specified mixture of copolymers (2), and also provides a water-absorbing resin prepared by the process. The process of the invention gives water-absorbing resins improved not only in water-absorbing ability, rate of water absorption, gel strength after water absorption and unlikelihood of affording a wetty feeling after water absorption but also in capability of retaining water under pressure.

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Osaka, Japan

Nobuyuki Oshima