Selectively permeable asymmetric membrane of polyetherimide

Details Selectively permeable asymmetric membrane of polyetherimide Selectively permeable asymmetric membrane of polyetherimide

C - Chemistry, Metallurgy

08

J

18/16, 204/96.17

C08J 5/22 (2006.01) B01D 69/12 (2006.01) B01D 71/64 (2006.01) C08L 79/08 (2006.01)

Patent

CA 1234461

ABSTRACT OF THE DISCLOSURE A gas-selectively permeable membrane and a method of forming said membrane are described. This membrane is an asymmetrical pore diameter structure film made of a polyetherimide having the recurring unit represented by formula (A) or a mixture of said polyetherimide and at least one polymer having the recurring unit represented by formula (B), wherein the mean pore diameter of a dense layer of the asymmetrical pore diameter structure film is 0.5 micron or less and the mean thickness of the dense layer is 10 microns or less: Image wherein x is a natural number including zero, Q is Image This membrane is superior in heat resistance and is suitable for use in the isolation of argon from air, for the concentration of oxygen, for the concentration of hydrogen in twon gas, and so forth.

443877

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