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22. 发明授权

US4473475A Charge modified microporous membrane, process for charge modifying said membrane, and process for filtration of fluids 失效
标题翻译：电荷改性微孔膜，用于电荷改性所述膜的方法和用于过滤流体的方法
公开(公告)号：US4473475A
公开(公告)日：1984-09-25
申请号：US268543
申请日：1981-05-29
申请人： Robert G. Barnes, Jr. , Chaokang Chu , George T. Emond , Asit K. Roy
发明人： Robert G. Barnes, Jr. , Chaokang Chu , George T. Emond , Asit K. Roy
IPC分类号： C08G59/00 , B01D61/46 , B01D67/00 , B01D71/52 , B01D71/56 , B01D71/82 , C08G59/50 , C08J5/22 , C08J9/34 , B01D13/00
CPC分类号： B01D67/0093 , B01D71/56 , B01D2323/30
摘要： A cationic charge modified microporous membrane is provided. The membrane comrises a hydrophilic organic polymeric microporous membrane having bonded thereto, through a cross-linking agent, a charge modifying amount of a cationic charge modifying agent. The charge modifying agent is an aliphatic amine or polyamine, preferably tetraethylene pentamine, and the cross-linking agent is an aliphatic polyepoxide having a molecular weight of less than about 500, preferably 1, 4 butanediol diglycidyl ether. The microporous membrane is preferably nylon. The process for applying the charge modifying agent to the membrane, preferably comprises contacting the membrane with an aqueous solution of the charge modifying agent and then contacting the membrane with a substantially aqueous solution of the cross-linking agent. The preferred process uses high purity water, i.e. water having no significant ionic content, to produce a membrane suitable for use in filtering ultra pure (18 megohm-cm resistivity) water for use in producing electronic devices. Such a membrane exhibits an advantageously low "flush-out" time compared to known cationic charge modified microporous membranes and unmodified microporous membranes.
摘要翻译：提供阳离子电荷改性微孔膜。膜通过交联剂，电荷调节量的阳离子电荷改性剂与其结合的亲水性有机聚合物微孔膜。电荷改性剂是脂族胺或多胺，优选四亚乙基五胺，交联剂是分子量小于约500，优选1,4-丁二醇二缩水甘油醚的脂族聚环氧化物。微孔膜优选为尼龙。将电荷调节剂施用于膜的方法优选包括使膜与电荷改性剂的水溶液接触，然后使膜与基本上水解的交联剂溶液接触。优选的方法使用高纯度水，即没有显着离子含量的水，以产生适合用于过滤用于生产电子器件的超纯（18兆欧电阻）的水。与已知的阳离子电荷改性微孔膜和未改性的微孔膜相比，这样的膜显示出有利的低“冲洗”时间。

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