US5039389A
Expired / Lapsed
US
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Membrane/electrode combination having interconnected roadways of catalytically active particles
Assignee: Dow Chemical Co
•
Filing: 1989-07-27
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Granted: 1991-08-13
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Expires: 2009-07-27
Abstract
Abstract The invention is a membrane/electrode combination comprising: an ion exchange membrane having a plurality of interconnected roadways of catalytically active particles bonded to at least one face of the membrane.
Inventors
- 👤 James W. McMichael
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:05
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/86; H01M4/90; H01M4/9091; C; C25; C25B; C25B9/00; C25B9/17; C25B9/19; C25B9/23; H01M4/92; H01M4/925; H01M4/926; H01M4/928; H01M8/00; H01M8/10; H01M8/1004; H01M8/1016; H01M8/1018; H01M8/102; H01M8/1023; H01M8/1039; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
51 words
A membrane/electrode combination comprising: an ion exchange membrane having a plurality of catalytically active particles bonded to at least one face of the membrane in an interconnected roadway pattern, wherein said interconnected roadway pattern is an open, clearly defined, geometrically regular pattern which leaves portions of the membrane uncoated and exposed.
Claim 2
Dependent Claim
51 words
A membrane/electrode combination comprising: an ion exchange membrane having a plurality of catalytically active particles bonded to at least one face of the membrane in an interconnected roadway pattern, wherein said interconnected roadway pattern is an open, clearly defined, geometrically regular pattern which leaves portions of the membrane uncoated and exposed.
Claim 3
Dependent Claim
23 words
The membrane/electrode combination of claim 1 wherein the interconnected roadways cover from about 40 to about 60% of one face of the membrane.
Claim 4
Dependent Claim
23 words
The membrane/electrode combination of claim 1 wherein the interconnected roadways cover from about 45 to about 55% of one face of the membrane.
Claim 5
Dependent Claim
13 words
The membrane/electrode combination of claim 1 wherein the membrane is a fluorocarbon-type material.
Claim 6
Dependent Claim
13 words
The membrane/electrode combination of claim 1 wherein the membrane is a hydrocarbon-type material.
Claim 7
Dependent Claim
14 words
The membrane/electrode combination of claim 1 wherein the membrane is in its thermoplastic state.
Claim 8
Dependent Claim
261 words
The membrane/electrode combination of claim 1 wherein the membrane is a copolymer of a first type monomer and a second type monomer, wherein first type of monomer is represented by the general formula: CF.sub.2 ═CZZ' (I) where: Z and Z' are independently selected from the group consisting of --H, --Cl, --F, or --CF 3 ; and the second type of monomer consists of one or more monomers selected from compounds represented by the general formula: Y--(CF.sub.2).sub.a --(CFR.sub.f).sub.b --(CFR.sub.f').sub.c --O--[CF(CF.sub.2 X)--CF.sub.2 --O].sub.n --CF═CF.sub.2(II) where: Y is selected from the group consisting of --SO 2 Z, --CN, --COZ, and C(R 3 f)(R 4 f)OH; Z is --I, --Br, --Cl, --F, --OR, or --NR 1 R 2 ; R is a branched or linear alkyl radical having from 1 to about 10 carbon atoms or an aryl radical; R 3 f and R 4 f are independently selected from the group consisting of perfluoroalkyl radicals having from 1 to about 10 carbon atoms; R 1 and R 2 are independently selected from the group consisting of --H, a branched or linear alkyl radical having from 1 to about 10 carbon atoms or an aryl radical; a is 0-6; b is 0-6; c is 0 or 1; provided a+b+c is not equal to 0; X is --Cl, --Br, --F, or mixtures thereof when n is 0 to 6; and R 4 and R f' are independently selected from the group consisting of --F, --Cl, perfluoroalkyl radicals having from 1 to about 10 carbon atoms and fluorochloroalkyl radicals having from 1 to about 10 carbon atoms.
Claim 9
Dependent Claim
39 words
The membrane/electrode combination of claim 7 wherein Y is --SO 2 F or --COOCH 3 ; n is 0 or 1; R f and R f' are --F; X is --Cl or --F; and a+b+c is 2 or 3.
Claim 10
Dependent Claim
109 words
The membrane/electrode combination of claim 7 wherein the copolymer also includes a third type of monomer selected from the compounds represented by the general formula: Y'--(CF.sub.2).sub.a' --(CFR.sub.f).sub.b' --(CFR.sub.f').sub.c' --O--[CF(CF.sub.2 X')--CF.sub.2 --O].sub.n' --CF═CF.sub.2(III) where: Y' is --F, --Cl or --Br; a' and b' are independently 0-3; c is 0 or 1; provided a'+b'+c' is not equal to 0; n' is 0-6; R 4 and R f' are independently selected from the group consisting of --Br, --Cl, --F, perfluoroalkyl radicals having from about 1 to about 10 carbon atoms, and chloroperfluoroalkyl radicals having from 1 to about 10 carbon atoms; and X' is --F, --Cl, --Br, or mixtures thereof when n'>1.
Claim 11
Dependent Claim
50 words
The membrane/electrode combination of claim 1 wherein the plurality of catalytically active particles are selected from the group consisting of oxides ruthenium, iridium, rhodium, platinum, palladium, either alone or in combination with an oxide of a film-forming metal and cobalt oxide either alone or in combination with other metal oxides.
Claim 12
Dependent Claim
16 words
The membrane/electrode combination of claim 1 wherein the catalytically active particles are blended with a binder.
Claim 13
Dependent Claim
12 words
The membrane/electrode combination of claim 11 wherein binder is a fluorocarbon polymer.
Claim 14
Dependent Claim
23 words
The membrane/electrode combination of claim 12 wherein the fluorocarbon polymer is the same polymer which forms at least a part of the membrane.
Claim 15
Dependent Claim
23 words
The membrane/electrode combination of claim 1 wherein the pattern of interconnected roadway pattern has a width that does not exceed about one centimeter.
Claim 16
Dependent Claim
23 words
The membrane/electrode combination of claim 1 wherein the pattern of interconnected roadway pattern has a width that does not exceed about one-half centimeter.
Claim 17
Dependent Claim
23 words
The membrane/electrode combination of claim 1 wherein the pattern of interconnected roadway pattern has a width that does not exceed about 0.2 centimeter.
Claim 18
Dependent Claim
18 words
The membrane/electrode combination of claim 1 wherein an electrically conductive metal is distributed among the catalytically active particles.
Claim 19
Dependent Claim
24 words
The membrane/electrode combination of claim 17 wherein the electrically conductive particles are selected from the group consisting of silver, nickel, tantalum, platinum, and gold.
Claim 20
Dependent Claim
17 words
The membrane/electrode combination of claim 1 wherein the roadways a thickness as low as about 20 microns.
Claim 21
Dependent Claim
20 words
The membrane/electrode combination of claim 1 wherein the interconnected roadway pattern has a thickness as low as about 5 microns.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-08-12 | 1995-02-11 | 1995-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-12 | 1999-02-11 | 1999-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-12 | 2003-02-11 | 2003-08-13 | $7700.00 | Window Closed / Lapsed |