发明名称 |
Semipermeable composite membranes, their manufacture, and use |
摘要 |
Semipermeable composite membranes containing on one surface of a porous support a superficial thin film having semipermeable properties. The film contains polyvinyl alcohol (PVA)/polyvinyl alcohol-copolymers (PVA-copolymers) modified by at least radicals containing ionizable groups are provided. The modification steps comprise e.g. reacting PVA/PVA-copolymer films with (a) a monomeric organic compound containing at least two functional groups, (b) a linear or branched polyfunctional oligomer or polymer, and (c) a compound containing cross-linking and ionizable groups. The novel membranes show good mechanical, temperature and pH-stabilities and are suitable, for example, for separating monovalent ions of low ionic weight from polyvalent ions of low or high ionic weight or for separating ionic compounds from non-ionic compounds or from ionic compounds which have a different molecular weight or opposite charge. They can be used for example for separating salts from organic compounds (dyes) or in waste-water treatment.
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申请公布号 |
US4753725(A) |
申请公布日期 |
1988.06.28 |
申请号 |
US19810301242 |
申请日期 |
1981.09.11 |
申请人 |
ALIGENA AG |
发明人 |
LINDER, CHARLES;PERRY, MORDECHAI;KOTRARO, REUVEN |
分类号 |
B01D67/00;B01D71/38;B01D71/82;C08F8/00;C08J9/00;C08J9/36;(IPC1-7):B01D13/00 |
主分类号 |
B01D67/00 |
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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