Ultrafiltration thin film membranes
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United States of America Patent
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Mar 21, 1989
Grant Date -
N/A
app pub date -
Oct 20, 1986
filing date -
Oct 20, 1986
priority date (Note) -
Expired
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Abstract
Mono-layer thin film membranes are provided which are ultraporous. Such mono-layers are formed having a thickness on the order of about 1.2 to 150 nanometers, by a variety of polymerization, cross-linking, and film treatment processes to achieve the development of controlled pore sizes in the ultraporous size range corresponding to a molecular weight cutoff values of from about 500 to about 1,000,000. Such thin film mono-layer membranes are ordinarily supported on a microporous support material, desirably a microporous polymer membrane having a smooth, microporous skin with pore sizes in the range of from about 0.1 microns to about 3 microns, preferably from about 0.1 microns to about 0.5 microns, in diameter. There may be an intermediate gel layer. These membranes are useful for ultrafiltration, dialysis, and molecular separations.
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