Patent EP0144054A2 successfully refreshed from Google Patents.
EP0144054A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Composite films adapted for selective gas separation
Assignee: Panasonic Holdings Corp
•
Filing: 1984-11-26
•
Granted: —
•
Expires: 2004-11-26
Abstract
Abstract A gas-permeable composite film comprising a gas-selective film consisting of at least one layer for separating and concentrating an intended gas from mixed gases, and a covering layer formed on the selective film. The covering layer has a critical surface tension not larger than 30 dyne cm and a contact angle of water of not smaller than 90°. A method of regenerating the film used over a long term is also described in which the used film is contacted with an organic liquid medium inert to the material for the film.
Inventors
- 👤 Midori Kawahito
- 👤 Yukihiro Saito
- 👤 Shiro Asakawa
- 👤 Takafumi Kashima
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 06:19
CPC Classifications
B; B01; B01D; B01D67/00; B01D67/0081; B01D67/0088; B01D69/00; B01D69/10; B01D69/107; B01D69/12; B01D69/1216
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
92 words
A gas-permeable composite film which comprises, on a microporous polymer support in the following order, a gas selective film consisting of at least one layer for separating and concentrating an intended gas from mixed gases, and a covering layer formed on the film and having a thickness of from 50 to 200 angstrom, the covering layer being made of a polymer having a critical surface tension not larger than 30 dyne/cm, a contact angle of water with a surface of the covering layer contacting the mixed gas being 90 0 or higher.
Claim 2
Dependent Claim
92 words
A gas-permeable composite film which comprises, on a microporous polymer support in the following order, a gas selective film consisting of at least one layer for separating and concentrating an intended gas from mixed gases, and a covering layer formed on the film and having a thickness of from 50 to 200 angstrom, the covering layer being made of a polymer having a critical surface tension not larger than 30 dyne/cm, a contact angle of water with a surface of the covering layer contacting the mixed gas being 90 0 or higher.
Claim 3
Dependent Claim
35 words
The gas-permeable composite film according to Claim 1, wherein the covering layer is made of a polymer selected from the group consisting of polymethylhydrogensiloxane, fluorinated alkyl methacrylate resins, poly-4-methylpentene-1, polymethyl fluorinated alkylsiloxanes and mixtures thereof.
Claim 4
Dependent Claim
14 words
The gas-permeable composite film according to Claim 2, wherein said polymer is said polymethylhydrogensilicone.
Claim 5
Dependent Claim
18 words
The gas-permeable composite film according to Claim 3, wherein said polymer is a cured product of said polymethylhydrogensiloxane.
Claim 6
Dependent Claim
38 words
The gas-permeable composite film according to Claim 1, wherein the at least one layer contacting with the covering layer is made of a resin composition comprising a from 50 to 90 wt% of a reaction product of polyhydroxystyrene-polysulfone-polydimethylsiloxane.
Claim 7
Dependent Claim
22 words
The gas-permeable composite film according to Claim 5, wherein the at least one layer is made of a reaction product of polyhydroxystyrene-polysulfone-polydimethylsiloxane.
Claim 8
Dependent Claim
135 words
The gas-permeable composite film according to Claim 1, wherein said at least one layer is made of a polymer selected from the group consisting of polyphenylene oxides of the general formula in which R represents a linear or branched alkyl group having from 1 to 5 carbon atoms, m is an integer of 1, 2 or 3, and n is an integer, polyolefins of the formula in which R' represents a linear or branched alkyl group or halogenated alkyl group having from 2 to 8 carbon atoms, and a is an integer, and polyacetylenes of the general formula in which R 1 represents a hydrogen atom or a halogen atom, R 2 represents a linear or branched alkyl group having from 2 to 8 carbon atoms or a phenyl group, and x is an integer.
Claim 9
Dependent Claim
54 words
The gas-permeable composite film according to Claim 1, wherein said gas-selective film has a two-layered structure which comprises a layer of a polymer selected from the group consisting of polyphenylene oxide, polydimethylsiloxane-polycarbonate copolymers and copolymers of polyhydroxystyrene-polysulfone-polymethylsiloxane and a layer of the above-defined polymer but different from the polymer used for the first-mentioned layer.
Claim 10
Dependent Claim
41 words
The gas-permeable composite film according to Claim 1, wherein said gas-selective film has a two-layered structure comprising a layer of a polymer having good gas permeability and a layer of a polymer having good gas separability in this or reverse order.
Claim 11
Dependent Claim
167 words
The gas-permeable composite film according to Claim 9, wherein the gas-permeable layer is made of a polymer selected from the group consisting of polyorganosiloxanes, copolymers of polyorganosiloxanes and polyhydrogenstyrene, copolymer of novolac and polyorganosiloxanes, copolymers of polyhydrxyostyrene- polysulfone-polydimethylsiloxane and copolymers of polyhydroxystyrene-polyurethane-polydimethylsiloxane and the gas-separable layer is made of a polymer selected from the group consisting of polyphenylene oxides of the general formula in which R represents a linear or branched alkyl group having from 1 to 5 carbon atoms, m is an integer of 1, 2 or 3, and n is an integer, polyolefins of the formula in which R' represents a linear or branched alkyl group or halogenated alkyl group having from 2 to 8 carbon atoms, and a is an integer, and Polyacetylenes of the general formula in which R 1 represents a hydrogen atom or a halogen atom, R 2 represents a linear or branched alkyl group having from 2 to 8 carbon atoms or a phenyl group, and x is an integer.
Claim 12
Dependent Claim
92 words
The gas permeable composite film according to Claim 1, wherein said gas selective film consists of a first ultrathin layer of a polymer having good gas permeability, a second ultrathin layer formed on the first layer and made of a polymer having good gas separability, and a third ultrathin layer formed on the second layer and made of a polymer having good gas permeability, said first thin layer having a thickness of from 0.2 to 1.0 µm and an oxygen permeability constant of not smaller than 1 x 10 cc.cm/cm 2 .second.cmHg.
Claim 13
Dependent Claim
42 words
The gas-permeable composite film according to Claim 11, wherein the first and third layers are each made of a polymer selected from the group consisting of copolymers of polyhydroxystxrene-polydimethylailoxane, copolymers of novolac-polydimethylsiloxanes, copolymers of polyhydroxystyrene-polysulfone-polydimethylsiloxane, copolymers of novolac-polysulfones-polydimethylsiloxane and copolymer of polyhydroxystyrene-polyurethane-polydimethylsiloxane.
Claim 14
Dependent Claim
23 words
The gas-permeable composite film according to Claim 12, wherein said first and third layers are each made of a copolymer of polyhydroxystyrene-polysulfone- polydimethylsilaxane.
Claim 15
Dependent Claim
134 words
The gas-permeable composite film according to Claim 11, wherein said second thin film is made of a polymer selected from the group consisting of polyphenylene oxides of the general formula in which R represents a linear or branched alkyl group having from 1 to 5 carbon atoms, m is an integer of 1, 2 or 3, and n is an integer, polyolefins of the formula in which R' represents a linear or branched alkyl group or halogenated alkyl group having from 2 to 8 carbon atoms, and a is an integer, and polyacetylenes of the general formula in which R 1 represents a hydrogen atom or a halogen atom, R 2 represents a linear or branched alkyl group having from 2 to 8 carbon atoms or a phenyl group, and x is an integer.
Claim 16
Independent Claim
53 words
A method for regenerating a gas separator film which comprises contacting a gas separator film consisting of at least one layer and having a decreased permeation rate as time passes with an organic liquid medium incapable of dissolving a polymer constituting the separator film or serving as a poor solvent for the polymer.
Claim 17
Independent Claim
53 words
A method for regenerating a gas separator film which comprises contacting a gas separator film consisting of at least one layer and having a decreased permeation rate as time passes with an organic liquid medium incapable of dissolving a polymer constituting the separator film or serving as a poor solvent for the polymer.
Claim 18
Dependent Claim
17 words
The method according to Claim 15, wherein said gas separator film is immersed in the liquid medium.
Claim 19
Dependent Claim
17 words
The method according to Claim 15, wherein said liquid medium is sprayed over said gas separator film.
Claim 20
Dependent Claim
14 words
The method according to Claim 15, wherein the liquid medium is an aliphatic alcohol.
Claim 21
Dependent Claim
14 words
The method according to Claim 18, wherein the aliphatic alcohol is methanol or ethanol.
Claim 22
Dependent Claim
19 words
The method according to Claim 15, wherein said polymer constituting the gas separator film is a copolymer of polyhydroxystyrene-polysulfone-polydimethylsiloxane.
Claim 23
Dependent Claim
11 words
The method according to Claim 15, wherein said polymer is poly-4-methylpentene-1.
Claim 24
Dependent Claim
12 words
The method according to Claim 15, wherein said polymer is polyphenylene oxide.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.