EP0112134A2
Expired / Lapsed
EP
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Gas-selectively permeable membrane and method of forming said membrane
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1983-12-09
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Granted: —
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Expires: 2003-12-09
Abstract
Abstract 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 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: wherein all the symbols are defined in the specification. 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.
Inventors
- 👤 Katsuya C/O Osaka Works Of Sumitomo Yamada
- 👤 Koichi C/O Osaka Works Of Sumitomo Okita
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 15:16
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/48; B01D69/00; B01D69/12; B01D69/125; B01D69/127
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
88 words
A gas-selectively permeable membrane comprising 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 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: wherein x is a natural number including zero, Q is
Claim 2
Dependent Claim
88 words
A gas-selectively permeable membrane comprising 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 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: wherein x is a natural number including zero, Q is
Claim 3
Dependent Claim
30 words
The gas-selectively permeable membrane as claimed in Claim 1, wherein at least one thin polymer film is further laminated on the dense layer of the asymmetrical pore diameter structure film.
Claim 4
Dependent Claim
39 words
The gas-selectively permeable membrane as claimed in Claim 1, wherein at least one thin polymer film laminated on the dense layer of the asymmetrical pore diameter structure film is a thin polymer layer prepared by coating a rubber solution.
Claim 5
Dependent Claim
38 words
The gas-selectively permeable membrane as claimed in Claim 2, wherein at least one thin polymer film laminated on the dense layer of the asymmetrical pore diameter structure film is a plasma polymerization thin layer formed by glow discharge.
Claim 6
Dependent Claim
85 words
A method of forming the gas-selectively permeable membrane as claimed in Claim 1, which comprises applying a solution containing 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 formula (B) and a solvent, to form a film, bringing the thus-formed film into contact with a coagulating agent to remove the solvent and then drying the film: wherein x is a natural number including zero, Q
Claim 7
Dependent Claim
23 words
The method as claimed in Claim 5, wherein the solvent is N-methyl-2-pyrrolidone, N-formylpiperidine, 1-formylmorpholine, tetrahydrofuran, or a mixture comprising two or more thereof.
Claim 8
Dependent Claim
34 words
The method as claimed in Claim 5, wherein a polymer solution is coated on the dense layer of the asymmetrical pore diameter structure film and then dried to laminate a polymer thin film thereon.
Claim 9
Dependent Claim
51 words
The method as claimed in Claim 5, wherein glow discharge is applied while supplying a polymerizable monomer in an atmosphere of 0.5 torr or less with or without coating a polymer solution on the dense layer of the asymmetrical pore diameter structure film to deposit thereon a plasma polymerization thin film.
References Cited (Backward Citations)
No citation records indexed.
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