Ultrapous thin-film membranes

Details Ultrapous thin-film membranes Ultrapous thin-film membranes

1989-11-21

1991-12-03

Spear, Frank

Coating processes

Foraminous product produced

Microporous coating

210490, 21050037, 21050041, B01D 6700

Patent

active

050699458

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 molecular weight cutoff values of from 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 ultraporous, dialysis, and molecular separations.

REFERENCES:
patent: 3904519 (1975-09-01), McKinney, Jr. et al.
patent: 4039440 (1977-08-01), Cadotte
patent: 4244817 (1981-01-01), Yaginuma
patent: 4277344 (1981-07-01), Cadotte
patent: 4360434 (1982-11-01), Kawaguchi et al.
patent: 4429122 (1984-01-01), Zupancic
patent: 4659474 (1987-04-01), Perry et al.
patent: 4814082 (1989-03-01), Wrasidlo
International Search Report; Feb. 15, 1988; 3 pages.

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