Highly asymmetric ultrafiltration membranes

Details Highly asymmetric ultrafiltration membranes Highly asymmetric ultrafiltration membranes

1998-12-18

1999-07-27

Foelak, Morton

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Composite having voids in a component

21050022, 21050041, 4283188, B32B 514, B32B 520, B01D 3900, F08J 928

Patent

active

059287748

ABSTRACT:
The present invention relates to highly asymmetric polymer membranes for ultrafiltration (UF), and to a simplified method of their manufacture. Disclosed herein are UF membranes with a high degree of asymmetry between the size of pores at the skin face of the membrane and the size of pores at the opposite face of the membrane. Asymmetry ratios of these membranes range from about 20 to about 1000. The porous support layer between the skin face and the opposite face is reticular and is substantially free of macrovoids. These membranes thus have higher flow rates than prior UF membranes. The membranes are cast from polymer dope mixes that are either homogeneous solutions or stable colloidal dispersions.

REFERENCES:
patent: 4481260 (1984-11-01), Nohmi
patent: 4629583 (1986-12-01), Wrasidlo
patent: 4774039 (1988-09-01), Wrasidlo
patent: B14629583 (1997-08-01), Wrasidlo

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