Process for producing aromatic polyimide composite...

Details Process for producing aromatic polyimide composite... Process for producing aromatic polyimide composite...

B - Operations, Transporting

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117/88.5

B01D 39/00 (2006.01) B01D 69/12 (2006.01) B01D 71/64 (2006.01) C08J 9/28 (2006.01)

Patent

CA 1190100

PROCESS FOR PRODUCING AROMATIC POLYIMIDE COMPOSITE SEPARATING MEMBRANE ABSTRACT OF THE DISCLOSURE An aromatic polyimide composite membrane having an excellent gas-separating property is produced by a process comprising the steps of: coating at least one surface of a substrate consisting of an aromatic polyimide porous membrane with a solution of 0.05% to 10% by weights of an aromatic polyamic acid in an polar organic solvent, which is not capable of dissolving the polyimide porous membrane, at a temperature not exceeding 140°C; after a during drying the resultant thin coating layer of the polyamic acid solution, heating the resultant polyamic acid layer at a temperature of 150°C or more so as to convert the polyamic acid layer to the corresponding polyimide layer.

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