C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
18/32
C08J 9/36 (2006.01) B01D 67/00 (2006.01) B01D 71/28 (2006.01) C08F 8/00 (2006.01)
Patent
CA 1182258
Semipermeable membranes of modified styrene-based polymers, process for their manufacture and their use. Abstract of the Disclosure Semipermeable membranes of modified styrene polymers are obtained by modifying styrene polymers containing reactive groups (A) through chemical reaction with (a) a monomeric compound containing at least two functional groups, (b) a polyfunctional oligomer of polymer, and (c) a compound containing at least one, preferably two groups capable of reaction with (b), provided that the reactive groups are amino, hydroxyl or mercapto groups, (B) through chemical reaction with components (b) and (c), provided that the reactive groups are halogen atoms, aldehyde, cyanate or thiocyanate groups, or (C) through chemical reaction with hydroxylamine and components (a), (b) and (c), provided that the reactive group is a nitrile group. The new membranes can be used in reverse osmosis and ultrafiltration processes. They show good permeability (flux) and rejection charac- teristics as well as good solvent, compaction and temperature resistance. Their range of molecular cut-offs lies preferably between about 200 and 2000.
417699
Aviv Gershon
Kotraro Reuven
Linder Charles
Perry Mordechai
Aligena Ag
Hewson Donald E.
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