发明授权
- 专利标题: Water-absorbable polyacrylic acid resin powder, and process for production thereof
- 专利标题(中): 吸水性聚丙烯酸树脂粉末及其制造方法
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申请号: US13518438申请日: 2010-12-23
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公开(公告)号: US09334376B2公开(公告)日: 2016-05-10
- 发明人: Reiko Nakatsuru , Shigeru Sakamoto , Kazushi Torii , Toshihiro Takaai
- 申请人: Reiko Nakatsuru , Shigeru Sakamoto , Kazushi Torii , Toshihiro Takaai
- 申请人地址: JP Osaka-shi, Osaka
- 专利权人: NIPPON SHOKUBAI CO., LTD
- 当前专利权人: NIPPON SHOKUBAI CO., LTD
- 当前专利权人地址: JP Osaka-shi, Osaka
- 代理机构: Casimir Jones, SC
- 优先权: JP2009292318 20091224; JP2010088993 20100407; JP2010149907 20100630; JP2010179515 20100810
- 国际申请: PCT/JP2010/073254 WO 20101223
- 国际公布: WO2011/078298 WO 20110630
- 主分类号: B01J20/26
- IPC分类号: B01J20/26 ; C08J3/12 ; C08F220/06 ; A61L15/48 ; A61L15/60 ; C08F20/06
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.)