C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
18/16, 204/96.21
C08J 9/28 (2006.01) B01D 69/12 (2006.01) B01D 71/48 (2006.01)
Patent
CA 1255860
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 an aromatic polyester having the recurring unit represented by formula (A) or a mixture of said aromatic polyester and at least one polymer having the recurring unit represented by formular (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 (A) Image (B) "wherein X is a natural number including zero, Q is Image or Image , and Z is Image Image or 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.
442803
Okita Koichi
Yamada Katsuya
Riches Mckenzie & Herbert Llp
Sumitomo Electric Industries Ltd.
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