Microporous polyester membranes and polymer assisted phase...

Details Microporous polyester membranes and polymer assisted phase... Microporous polyester membranes and polymer assisted phase...

C - Chemistry, Metallurgy

08

J

18/16

C08J 9/26 (2006.01)

Patent

CA 1062412

ABSTRACT OF THE DISCLOSURE A polymer assisted phase inversion process for producing membranes is disclosed which includes forming a casting solution of a solvent resistant polymer and an assisting polymer both dissolved in a mutal solvent. The mutal solvent is extracted from the membrane which is then exposed to a solvent for the assisting polymer which is a non-solvent for the solvent resistant polymer. A preferred solvent resistant polymer is a polyester resin of the general formula Image Wherein a is an integer of at least 3 and not greater than 7, and n is an integer greater than about 45.

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