Macroporous asymmetrical hydrophilic membrane made of a synthetic polymer
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United States of America Patent
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Jan 19, 1988
Grant Date -
N/A
app pub date -
Dec 10, 1982
filing date -
Dec 17, 1981
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Disclosed are asymmetrical macroporous membranes based on a synthetic polymer comprising a polymeric mixture of 5 to 70% by weight polyvinylpyrrolidone having a molecular weight .gtoreq.100,000 Dalton and 95 to 30% by weight of a polymer selected from a group consisting of a polysulfone, a polyether sulfone and an aromatic or araliphatic polyamide, each of the percentages by weight being relative to the total weight of the polymeric mixture. The membrane has a water absorbency of at least 11% by weight of water, relative to its total weight, at 100% relative humidity and 25.degree. C. Also disclosed is a process for preparation of the membranes.
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