发明名称 |
WATER-ABSORBABLE POLYACRYLIC ACID RESIN POWDER, AND PROCESS FOR PRODUCTION THEREOF |
摘要 |
A process according to the present invention for production of water-absorbable polyacrylic acid resin powder, including: (a) polymerizing an acrylic acid-based monomer aqueous solution containing bubbles, and (b) drying a hydrogel crosslinked polymer thus obtained in the step of polymerizing, further includes (c) lowering solubility of dissolved gas in a monomer aqueous solution in the presence of a surfactant and/or a dispersing agent, so as to generate the bubbles in the acrylic acid-based monomer aqueous solution. With this arrangement, it is possible to provide white water-absorbable resin with better water absorbing rate, keeping or without significantly losing the other properties (permeability potential, bulk specific gravity, surface tension, absorbency against pressure, impact resistance, etc.) |
申请公布号 |
EP2518092(B1) |
申请公布日期 |
2017.03.15 |
申请号 |
EP20100839528 |
申请日期 |
2010.12.23 |
申请人 |
Nippon Shokubai Co., Ltd. |
发明人 |
NAKATSURU, Reiko;SAKAMOTO, Shigeru;TORII, Kazushi;TAKAAI, Toshihiro |
分类号 |
C08F20/06;A61L15/60;C08F220/06;C08J3/12 |
主分类号 |
C08F20/06 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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