Defect-free ultrahigh flux asymmetric membranes

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Date

1990-02-20

Authors

Ingo Pinnau
William Koros

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United States Patent and Trademark Office

Abstract

Defect-free, ultrahigh flux integrally-skinned asymmetric membranes having extremely thin surface layers (<0.2 .mu.m) comprised of glassy polymers are disclosed. The membranes are formed by casting an appropriate drope followed by forced convective evaporation of solvent to obtain a dry phase separated asymmetrical structure. The structure is then washed in a precipitation liquid and dried.

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