EP0277472A2
Expired / Lapsed
EP
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Solid state indicator electrode and method of making same
Assignee: Monsanto Co
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Filing: 1987-10-13
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Granted: —
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Expires: 2007-10-13
Abstract
Abstract A junction-type metal/metal oxide solid state indicator electrode (10) has the sensing portion of the electrode coated with a perfluorocarbon copolymer (12). The indicator electrode can be used in conjunction with a reference electrode to provide a pH sensor. In a preferred method of making the indicator electrode, multiple coats of perfluorocarbon polymer are applied to a metal/metal oxide electrode, each coat being dried before applying the next, and the final copolymer coating is cured, cooled and then hydrated.
Inventors
- 👤 Patrick John Kinlen
- 👤 John Edward Heider
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 10:45
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/28; G01N27/30; G01N27/333; G01N27/40
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
21 words
A junction-type metal/metal oxide solid state indicator electrode comprising a sensing portion, wherein the sensing portion has a perfluorocarbon copolymer coating.
Claim 2
Dependent Claim
21 words
A junction-type metal/metal oxide solid state indicator electrode comprising a sensing portion, wherein the sensing portion has a perfluorocarbon copolymer coating.
Claim 3
Dependent Claim
26 words
The solid state indicator electrode of Claim 1 wherein the metal/metal oxide is selected from the group consisting of palladium/palladium oxide, iridium/iridium oxide and titanium/iridium oxide.
Claim 4
Dependent Claim
58 words
The solid state indicator electrode of Claim 1 wherein the perfluorocarbon copolymer is a copolymer of at least two monomers wherein one monomer is selected from a group consisting of vinyl fluoride, hexafluoropropylene, vinylidene fluoride, trifluoroethylene, chlorotrifluoroethylene, perfluoro-(alkylvinyl ether) and tetrafluoroethylene and the second monomer is selected from a group of monomers containing an SO₂F or COF group.
Claim 5
Dependent Claim
17 words
The solid state indicator electrode of Claim 3 where the metal/metal oxide junction-type electrode is titanium/iridium oxide.
Claim 6
Independent Claim
59 words
A method for making a junction-type metal/metal oxide solid state indicator electrode comprising the steps: (a) contacting the electrode with a perfluorocarbon copolymer to form a copolymer-coated electrode, (b) drying the coated electrode, (c) repeating (a) and (b) to form a sufficiently coated electrode, (d) curing the copolymer coating, (e) cooling the electrode, and (f) hydrating the copolymer coating.
Claim 7
Independent Claim
59 words
A method for making a junction-type metal/metal oxide solid state indicator electrode comprising the steps: (a) contacting the electrode with a perfluorocarbon copolymer to form a copolymer-coated electrode, (b) drying the coated electrode, (c) repeating (a) and (b) to form a sufficiently coated electrode, (d) curing the copolymer coating, (e) cooling the electrode, and (f) hydrating the copolymer coating.
Claim 8
Dependent Claim
23 words
The method of Claim 5 wherein the metal/metal oxide is selected from the group consisting of palladium/palladium oxide, iridium/iridium oxide and titanium/iradium oxide.
Claim 9
Dependent Claim
55 words
The method of Claim 5 wherein the perfluorocarbon copolymer is a copolymer of two or more monomers wherein one monomer is selected from a group consisting of vinyl fluoride, hexafluoropropylene, vinylidene fluoride, trifluoroethylene, chlorotrifluorethylene, perfluoro(alkylvinyl ether) and tetraflurorethlene and the second monomer is selected from a group of monomers containing an SO₂F or COF group.
Claim 10
Dependent Claim
47 words
The method of Claim 5 wherein the electrode is contacted with a perfluorocarbon copolymer by dip coating 2 to 5 times in about a 5% to 15% by weight solution of the perfluorocarbon copolymer and dried at about 80°C to 120°C for about 30 to 90 minutes.
Claim 11
Dependent Claim
45 words
The method of Claim 8 wherein the copolymer coating of the junction-type electrode is cured by heating in the range of about 180°C to 230°C for about 15 to 60 minutes and cooled to room temperature over a period of about 30 to 90 minutes.
Claim 12
Dependent Claim
27 words
The method of Claim 9 wherein the copolymer coating of the electrode is hydrated by boiling in a buffer solution for about 15 to about 45 minutes.
Claim 13
Independent Claim
180 words
A method to make a junction-type metal/metal oxide solid state indicator electrode comprising the steps: (a) dip coating the electrode in a solution or suspension containing about 5% to 15% by weight of a perfluorocarbon copolymer to form a copolymer-coated electrode, (b) drying the coated electrode at about 80°C to 120°C for about 30 to 90 minutes, (c) repeating (a) and (b) from 2 to 5 times to form a sufficiently coated electrode, (d) heating the coated electrode in the range of about 180°C to 230°C for about 30 to 90 minutes, (e) cooling the electrode to room temperature over a period of about 30 to 90 minutes, and (f) hydrating the copolymer coating of the electrode by boiling in a buffer solution for about 15 to about 45 minutes, wherein the perfluorocarbon copolymer is a copolymer of at least two monomers wherein one monomer is selected from a group consisting of vinyl fluoride, hexafluoropropylene, vinylidene fluoride, trifluoroethylene, chlorotrifluoroethylene, perfluoro-(alkylvinyl ether) and tetrafluoroethylene and the second monomer is selected from a group of monomers containing an SO₂F or COF group.
Claim 14
Independent Claim
180 words
A method to make a junction-type metal/metal oxide solid state indicator electrode comprising the steps: (a) dip coating the electrode in a solution or suspension containing about 5% to 15% by weight of a perfluorocarbon copolymer to form a copolymer-coated electrode, (b) drying the coated electrode at about 80°C to 120°C for about 30 to 90 minutes, (c) repeating (a) and (b) from 2 to 5 times to form a sufficiently coated electrode, (d) heating the coated electrode in the range of about 180°C to 230°C for about 30 to 90 minutes, (e) cooling the electrode to room temperature over a period of about 30 to 90 minutes, and (f) hydrating the copolymer coating of the electrode by boiling in a buffer solution for about 15 to about 45 minutes, wherein the perfluorocarbon copolymer is a copolymer of at least two monomers wherein one monomer is selected from a group consisting of vinyl fluoride, hexafluoropropylene, vinylidene fluoride, trifluoroethylene, chlorotrifluoroethylene, perfluoro-(alkylvinyl ether) and tetrafluoroethylene and the second monomer is selected from a group of monomers containing an SO₂F or COF group.
Claim 15
Dependent Claim
33 words
A pH sensor comprising: (a) a junction-type metal/metal oxide solid state indicator electrode having a sensing portion, wherein the sensing portion has a perfluorocarbon copolymer coating, in combination with (b) a reference electrode.
Claim 16
Dependent Claim
33 words
A pH sensor comprising: (a) a junction-type metal/metal oxide solid state indicator electrode having a sensing portion, wherein the sensing portion has a perfluorocarbon copolymer coating, in combination with (b) a reference electrode.
Claim 17
Dependent Claim
22 words
The pH sensor of Claim 12 wherein the reference electrode is selected from the group comprising standard calomel electrodes and Ag/AgCl electrodes.
Claim 18
Dependent Claim
35 words
The pH sensor of Claim 12 wherein the reference electrode is a metal/metal salt electrode comprising an immobilized electrode in contact with the metal/metal salt electrode wherein the immobilized electrolyte had a perfluorocarbon copolymer coating.
Claim 19
Dependent Claim
21 words
The pH sensor of Claim 12 wherein the solid state indicator electrode is made according to the method of Claim 5.
Claim 20
Dependent Claim
24 words
The pH sensor of Claim 12 wherein the metal/metal oxide is selected from the group consisting of palladium/palladium oxide, iridium/iridium oxide and titanium/iridium oxide.
Claim 21
Dependent Claim
56 words
The pH sensor of Claim 12 wherein the perfluorocarbon copolymer is a copolymer of at least two monomers wherein one monomer is selected from a group consisting of vinyl fluoride, hexafluoropropylene, vinylidene fluoride, trifluoroethylene, chlorotrifluoroethylene, perfluoro-(alkylvinyl ether) and tetrafluoroethylene and the second monomer is selected from a group of monomers containing an SO₂E or COF group.
Claim 22
Dependent Claim
119 words
A pH sensor having a sensing portion and a support of electrically non-conductor material comprising: (a) a junction-type metal/metal oxide solid state indicator electrode in contact with the support, in combination with (b) a Ag/AgCl reference electrode in contact with the support wherein the reference electrode has an immobilized chloride in contact with the Ag/AgCl, and (c) a coating of perfluorocarbon copolymer over the sensing portion of the pH sensor,wherein the perfluorocarbon copolymer is a copolymer of at least two monomers wherein one monomer is selected from a group consisting of vinyl fluoride, hexafluoropropylene, vinylidene fluoride, trifluoroethylene, chlorotrifluoroethylene, perfluoro-(alkylvinyl ether), amd tetrafluoroethylene and the second monomer is selected from a group of monomers containing an SO₂E or COF group.
Claim 23
Dependent Claim
119 words
A pH sensor having a sensing portion and a support of electrically non-conductor material comprising: (a) a junction-type metal/metal oxide solid state indicator electrode in contact with the support, in combination with (b) a Ag/AgCl reference electrode in contact with the support wherein the reference electrode has an immobilized chloride in contact with the Ag/AgCl, and (c) a coating of perfluorocarbon copolymer over the sensing portion of the pH sensor,wherein the perfluorocarbon copolymer is a copolymer of at least two monomers wherein one monomer is selected from a group consisting of vinyl fluoride, hexafluoropropylene, vinylidene fluoride, trifluoroethylene, chlorotrifluoroethylene, perfluoro-(alkylvinyl ether), amd tetrafluoroethylene and the second monomer is selected from a group of monomers containing an SO₂E or COF group.
Claim 24
Dependent Claim
12 words
The solid state electrode made according to the method of Claim 5.
References Cited (Backward Citations)
No citation records indexed.
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