Microporous membrane
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United States of America Patent
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Aug 1, 1989
Grant Date -
N/A
app pub date -
Dec 2, 1987
filing date -
Dec 3, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A microporous membrane for use in filtration, the membrane being formed of a polyetherimide derived from an aromatic bis (ether anydride) and an organic diamine. The membrane is formed from a casting liquid comprising the polyetherimide together with a solvent and a non-solvent, forming a thin layer of the liquid and extracting at least part of the solvent and non-solvent to form the required membrane. The membrane may be modified by the inclusion of additional chemical moieties.
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