Highly asymmetric polyethersulfone filtration membranes

Details Highly asymmetric polyethersulfone filtration membranes Highly asymmetric polyethersulfone filtration membranes

1998-07-01

1999-02-09

Foelak, Morton

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Composite having voids in a component

21050041, 521 64, B32B 326, B01D 3900

Patent

active

058691740

ABSTRACT:
Highly asymmetric polyethersulfone membranes prepared from a stable, clear, homogeneous solution or stable colloidal dispersion of polyethersulfone are described. The membranes have a porous skin possessing a high density of skin pores with an average diameter of from about 0.001 micron to about 20 microns. In addition, the membrane has a porous support with an asymmetric region of gradually increasing pore diameters so that the opposite face of the membrane has an average pore diameter that is from about 50 to about 10,000 times the diameter of the skin pores.

REFERENCES:
patent: 4629563 (1986-12-01), Wrasidlo
patent: 4774039 (1988-09-01), Wrasidlo
patent: 4840733 (1989-06-01), Sasaki et al.
patent: 4933081 (1990-06-01), Sasaki et al.
patent: B14629563 (1997-06-01), Wrasidlo

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