发明授权
- 专利标题： Water absorbent material, method for production of surface cross-linked water absorbent resin, and method for evaluation of water absorbent material
- 专利标题（中）： 吸水材料，表面交联吸水性树脂的制造方法以及吸水材料的评价方法
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申请号： US11660758申请日： 2005-08-31
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公开(公告)号： US08501873B2公开(公告)日： 2013-08-06
- 发明人: Masazumi Sasabe , Kenji Kadonaga , Shigeru Sakamoto , Motohiro Imura , Tsunemasa Ueno , Hiroko Ueda , Yoshifumi Adachi
- 申请人： Masazumi Sasabe , Kenji Kadonaga , Shigeru Sakamoto , Motohiro Imura , Tsunemasa Ueno , Hiroko Ueda , Yoshifumi Adachi
- 申请人地址： JP 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
- 代理机构： Buchanan Ingersoll & Rooney PC
- 优先权： JP2004-256059 20040902
- 国际申请： PCT/JP2005/016360 WO 20050831
- 国际公布： WO2006/025586 WO 20060309
- 主分类号： C08F8/42
- IPC分类号： C08F8/42 ; C08F8/12 ; C08F6/02
摘要：
A homogeneously surface cross-linked water absorbent resin and a method for the production thereof are provided.The water absorbent material is formed of a surface cross-linked water absorbent resin resulting from granular irregularly pulverized shaped surface cross-linking the product of partial neutralization or whole neutralization of a water absorbent resin having acrylic acid or a metal salt thereof as a main component, which water absorbent material shows a metal atom concentration on the surface of the water absorbent material in the range of 0-10% within 0 second of polishing and 2-35% at 10 seconds value of polishing as determined by subjecting the water absorbent material to Ar ion discharge polishing under a voltage of 500 Å. The surface cross-linked water absorbent resin to be used herein can be produced by surface cross-linking a water absorbent resin having a specific particle diameter with a surface cross-linking agent having a water concentration in a specific range.