Membranes formed from unsaturated polyimides

Details Membranes formed from unsaturated polyimides Membranes formed from unsaturated polyimides

B - Operations, Transporting

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B01D 71/64 (2006.01) B01D 53/22 (2006.01) B01D 67/00 (2006.01) B01D 71/82 (2006.01) C08G 73/10 (2006.01)

Patent

CA 2026969

PATENT 211PUS04208 ABSTRACT The present invention is a class of polyimide membranes containing copolymerizable, surface modifiable units containing both aromatic diamines and alkenylated diamines having an allyl or allylaryl group preferably positioned ortho to an amine functionality. The polyimide membranes can be surface modified by treatment with an activating force such as high energy electromagnetic irradiation or with a free radical source to impart high selectivity to the membrane without causing a large decrease in composite permeance.

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