Asymmetric membranes

Details Asymmetric membranes Asymmetric membranes

1981-08-11

1986-12-16

Spear, Frank

Liquid purification or separation

Filter

Material

21050038, 2105004, 21050041, 21050043, B01D 1300

Patent

active

046295631

ABSTRACT:
Improved ultraporous and microporous membranes are provided with an entirely reticulated structure free of large finger voids. The reticulated support structure has gradually increasing pore size which reaches a maximum of from about 10 to about 20,000 times the diameter of the skin pores at the opposite face. The skin is very thin and has controllable highly uniform skin pores of from about 0.003 to about 3.0 microns in diameter. The structure offers highly desirable properties to such membranes.

REFERENCES:
patent: 3158532 (1964-11-01), Pall et al.
patent: 3615024 (1971-10-01), Michaels
patent: 3709774 (1973-01-01), Kimura
patent: 3988245 (1976-10-01), Wang
patent: 4177150 (1979-12-01), Inoue et al.
patent: 4220543 (1980-09-01), Yamashita
patent: 4229291 (1980-10-01), Walch et al.

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