发明申请
- 专利标题： Water-absorbent resin, hydropolymer, process for producing them, and uses of them
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申请号： US10942851申请日： 2004-09-17
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公开(公告)号： US20050054788A1公开(公告)日： 2005-03-10
- 发明人: Yorimichi Dairoku , Yoshio Irie , Shinichi Fujino , Yasuhiro Fujita , Takashi Azumi , Kunihiko Ishizaki
- 申请人： Yorimichi Dairoku , Yoshio Irie , Shinichi Fujino , Yasuhiro Fujita , Takashi Azumi , Kunihiko Ishizaki
- 优先权： JP2000-235995 20000803; JP2000-348632 20001115
- 主分类号： A61L15/24
- IPC分类号： A61L15/24 ; C08F2/00 ; C08F20/06
摘要：
The present invention provides a production process by which a water-absorbent resin of excellent quality can be obtained at a low cost by reasonable steps in aqueous solution polymerization. The process for producing a water-absorbent resin comprises the step of polymerizing an aqueous solution of water-absorbent resin-forming monomers including acrylic acid and/or its sodium salt as major components, wherein: (1) the aqueous solution has a monomer component concentration of not less than 45 weight %; (2) the polymerization is carried out while water is evaporated so that the ratio (concentration ratio) between a solid component concentration in a hydropolymer as formed by the polymerization and a solid component concentration in the aqueous monomer solution will not be less than 1.10; and (3) the solid component concentration in the hydropolymer as formed by the polymerization is not more than 80 weight %.