Ultrafiltration thin film membranes

Details Ultrafiltration thin film membranes Ultrafiltration thin film membranes

B - Operations, Transporting

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B01D 71/06 (2006.01) B01D 67/00 (2006.01) B01D 69/02 (2006.01) B01D 69/12 (2006.01) B01D 71/68 (2006.01)

Patent

CA 1319231

ULTRAFILTRATION THIN FILM MEMBRANES 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.

550817

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