Process for preparing a selective permeable membrane and...

Details Process for preparing a selective permeable membrane and... Process for preparing a selective permeable membrane and...

C - Chemistry, Metallurgy

08

J

18/14, 117/88.5

C08J 9/28 (2006.01) B01D 71/64 (2006.01) C08L 79/08 (2006.01)

Patent

CA 1146711

ABSTRACT OF THE DISCLOSURE A process is described for preparing a selective permeable membrane comprising (i) a polyimide polymer consisting essentially of a repeating unit of the formula (I): Image (I) wherein R1 is a divalent organic group, (ii) a swelling agent selected from the group of compounds represented by formulae (II) and (III): Image (II) R5?OH)m (III) wherein R2, R3 and R4, which may be the same or different, can be hydrogen, a methyl group, or an ethyl group, and when R2 is hydrogen, n can be an integer of from 1 to 5, and when R2 is a methyl or ethyl group, n can be an integer of from 1 to 3, R5 is a saturated aliphatic hydrocarbon group containing 3 to 6 carbon atoms, and m can be an integer of from 2 to 6, and (iii) an organic solvent, on a supporting substrate, and immersing the solution coated supporting substrate in a coagulating liquid which does not dissolve the polyimide polymer and is miscible with the organic solvent, to coagulate the polyimide polymer and form the membrane, and membranes prepared thereby are also described.

351848

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