C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
18/16
C08J 9/28 (2006.01) B01D 67/00 (2006.01) B01D 71/38 (2006.01) C08F 8/00 (2006.01)
Patent
CA 1170009
1-13063/ALI 8/+ Modified polyvinylalcohol containing semipermeable composite membranes,process for their manufacture and their use. Abstract of the Disclosure Semipermeable composite membranes containing on one surface of a poroussupport a superficial thin film having semipermeable properties said film contains polyvinyl alcohol (PVA)/polyvinyl alcohol-copolymers (PVA-copolymers) modified by at least radicals containing ionisable groups are provided. The modification steps comprise e.g. reacting PVA/PVA-copolymer films with (a) a monomeric organic compound contain- ing at least two functional groups, (b) a linear or branched polyfunc- tional oligomer or polymer, and (c) a compound containing cross-linking and ionisable groups. The novel membranes show good mechanical, tempe- rature 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.
385564
Kotraro Reuven
Linder Charles
Perry Mordechai
Aligena Ag
Gowling Lafleur Henderson Llp
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