Solvent-resistant microporous polymide membranes

Details Solvent-resistant microporous polymide membranes Solvent-resistant microporous polymide membranes

1995-07-18

1998-03-10

Kim, John

Liquid purification or separation

Filter

Material

95 47, 95 54, 210490, B01D 5322, B01D 7164

Patent

active

057257698

ABSTRACT:
An asymmetric microporous membrane with exceptional solvent resistance and highly desirable permeability is disclosed. The membrane is made by a solution-casting or solution-spinning process from a copolyamic acid comprising the condensation reaction product in a solvent of at least three reactants selected from certain diamines and dianhydrides and post-treated to imidize and in some cases cross-link the copolyamic acid. The membrane is useful as an uncoated membrane for ultrafiltration, microfiltration, and membrane contactor applications, or may be used as a support for a permselective coating to form a composite membrane useful in gas separations, reverse osmosis, nanofiltration, pervaporation, or vapor permeation.

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