Modified acrylonitrile polymer containing semipermeable membranes
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United States of America Patent
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Oct 16, 1984
Grant Date -
N/A
app pub date -
Mar 8, 1982
filing date -
Mar 25, 1981
priority date (Note) -
Expired
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Abstract
Semipermeable membranes of polyacrylonitrile or copolymers of acrylonitrile and other ethylenically unsaturated monomers are chemically modified through reaction with (a) hydroxylamine and (b) a poly functional ionic colorless cyclic carbonic acid imide-halide capable of reaction with amidoxime groups, and optionally containing ionic groups. The new membranes show good compaction and solvent resistance and are stable over a broad temperature and pH range. They are suitable for reverse osmosis and especially ultrafiltration processes.
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