Asymmetric semipermeable poly(aryletherketone) membranes and method of producing same
AssigneeIonics, Incorporated
InventorLawrence C. Costa
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Abstract
Asymmetric, semipermeable membranes cast from a solution comprised of poly(aryletherketone) dissolved in a strongly protic non-reactive acid.
Claims14
A process of forming an asymmetric semipermeable membrane by casting a solution comprising a poly(aryletherketone)(PAEK) or mixtures of poly(aryletherketones) dissolved in strongly protic non-reactive acids, said PAEK having repeating units of the formula:
- --CO--Ar.sup.1 --CO--Ar.sup.2 --
- wherein Ar.sup.1 and Ar.sup.2 are aromatic moieties, wherein at least one aromatic moiety contains a diaryl ether functional group which is a part of the polymer backbone, and wherein both Ar.sup.1 and Ar.sup.2 are covalently linked to the carbonyl groups through aromatic carbon atoms.
A process of casting an asymmetric semipermeable membrane comprising coating a fabric support material with a solution containing between about 10% to 30% by weight of PAEK in a mixture of methanesulfonic acid/trifluoromethanesulfonic acid, thereafter immersing said coated support material into a precipitation fluid to form the membrane.
Dependencies are inferred from the claim text.