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AssigneeNippon Shokubai Co., Ltd.
InventorsKunihiko Ishizaki, Hisanobu Obara, Nobuyuki Harada, Yoshihiro Motono, Koji Miyake
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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.
A water-absorbent resin having an average particle size within a range of from 50 .mu.m to 1,000 .mu.m, pores with an average pore diameter within a range of from 10 .mu.m to 500 .mu.m, and an absorbent capacity of not lower than 25 g/g 60 minutes after an initiation of absorption under pressure, a water-soluble component content of not higher than 15 weight percent, and a residual monomer content of not higher than 500 ppm.
A water-absorbent resin composition comprising an absorbent resin having an average particle size within a range of from 50 .mu.m to 1,000 .mu.m, said water-absorbent resin composition also having a water retention capacity of not lower than 20 g/g, an absorption rate of not higher than 120 seconds, and a liquid permeability of not higher than 200 seconds under pressure.
A water-absorbent resin composition, comprising:
Dependencies are inferred from the claim text.