Aromatic polyimide composite separating membrane

Details Aromatic polyimide composite separating membrane Aromatic polyimide composite separating membrane

B - Operations, Transporting

01

D

117/88.5

B01D 69/12 (2006.01) B01D 71/64 (2006.01) C08L 79/08 (2006.01)

Patent

CA 1199534

- 50 - AROMATIC POLYIMIDE COMPOSITE SEPARATING MEMBRANE ABSTRACT OF THE DISCLOSURE An aromatic polyimide composite membrane having a satisfactory gas-permeating property and an excellent gas- separating property comprises an aromatic polyimide porous membrane substrate and at least one coating layer which has been prepared (A) by coating at least one surface of the substrate with a dilute dope solution containing 0.01 to 5 parts by weight of a soluble aromatic polyimide and/or polyamic acid dissolved in a solvent which consists es- sentially of 100 parts by weight of a base component incapable of dissolving therein the substrate in an amount of 3% by weight or more and 0 to 15 parts by weight of an additional component capable of dissolving therein the 5% by weight or more of the aromatic polymeric material and compatible with the base component; and (B) by gradually evaporating the solvent from the coated dilute dope solution layer.

406837

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