Patent Number: 6,251,960

Title: Process for production of water absorbent resin

Abstract: A water-absorbent resin is produced by dispersing a solid blowing agent having an average particle diameter within a range of from 1 .mu.m to 100 .mu.m in an aqueous monomer solution containing an unsaturated monomer and a cross-linking agent, and then polymerizing the unsaturated monomer. The water-absorbent resin has excellent water absorption characteristics, such as improved dispersion and absorption rate of aqueous fluid, enhanced water retention capacity and dry touch, lower water-soluble component content, and lower residual monomer content. When a water-absorbent resin composition using the water-absorbent resin is used for, for example, a sanitary material, it is possible to improve the absorption rate and water retention capacity, and prevent leakage of fluid from the sanitary material.

Inventors: Ishizaki; Kunihiko (Suita, JP), Obara; Hisanobu (Himeji, JP), Harada; Nobuyuki (Suita, JP), Motono; Yoshihiro (Himeji, JP), Miyake; Koji (Himeji, JP)

Assignee: Nippon Shokubai Co., Ltd.

International Classification: C07C 257/14 (20060101); C07C 257/00 (20060101); C08J 9/06 (20060101); C08J 9/00 (20060101); C08J 009/28 ()

Expiration Date: 06/26/2018