Ultrafiltration thin film membranes

Details Ultrafiltration thin film membranes Ultrafiltration thin film membranes

1986-10-20

1989-03-21

Spear, Frank

Liquid purification or separation

Filter

Supported, shaped or superimposed formed mediums

21050037, 21050041, B01D 1300

Patent

active

048140821

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.

REFERENCES:
patent: 4039440 (1977-08-01), Cadotte
patent: 4226673 (1980-10-01), Fremont
patent: 4244817 (1981-01-01), Yaginuma
patent: 4337154 (1982-06-01), Fukuan et al.
patent: 4559139 (1985-12-01), Uemura et al.

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