EP0267892A2
Expired / Lapsed
EP
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A solid state reference electrode
Assignee: Monsanto Co
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Filing: 1987-11-12
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Granted: —
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Expires: 2007-11-12
Abstract
Abstract A solid state reference electrode (1) comprises a metal/metal salt electrode (10), an immobilized electrolyte (12) in contact with the metal salt, and a perfluorocarbon copolymer coating (14) on the immobilized electrolyte to prevent migration of the electrolyte away from the electrode.
Inventors
- 👤 John Edward Heider
- 👤 Patrick John Kinlen
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 00:07
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/28; G01N27/30; G01N27/301
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
32 words
A metal/metal salt solid state reference electrode comprising (a) an immobilized electrolyte in contact with the electrode, and (b) a coating of a perfluorocarbon copolymer cation exchange polymer on the immobilized electrolyte.
Claim 2
Dependent Claim
32 words
A metal/metal salt solid state reference electrode comprising (a) an immobilized electrolyte in contact with the electrode, and (b) a coating of a perfluorocarbon copolymer cation exchange polymer on the immobilized electrolyte.
Claim 3
Dependent Claim
29 words
The solid state reference electrode of Claim 1 wherein the metal/metal salt electrode is Ag/Ag n X where X is S, Cl, B or I and n=1 or 2.
Claim 4
Dependent Claim
58 words
The solid state reference 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
15 words
The solid state reference electrode of Claim 4 wherein the metal/metal salt electrode is Ag/AgCl.
Claim 6
Dependent Claim
20 words
The solid state reference electrode of Claim 1 wherein the immobilized electrolyte comprises an at least partially quaternized halogenated polymer.
Claim 7
Dependent Claim
20 words
The solid state reference electrode of Claim 1 wherein the immobilized electrolyte is an at least partially quaternized polyvinylbenzyl chloride.
Claim 8
Dependent Claim
86 words
The solid state reference electrode prepared by the method comprising (a) contacting a metal/metal salt electrode in a solution or suspension of at least partially quaternized polymer containing immobilized electrolytes, (b) drying the electrode, (c) contacting the electrode in a solution or suspension containing one or more perfluorocarbon copolymers cation-exchange polymers, (d) drying the coating on the electrode, (e) repeating (c) and (d) until the electrode is sufficiently coated, (f) curing the copolymer coating, (g) cooling the electrode, and (h) hydrating the coating of the electrode.
Claim 9
Dependent Claim
86 words
The solid state reference electrode prepared by the method comprising (a) contacting a metal/metal salt electrode in a solution or suspension of at least partially quaternized polymer containing immobilized electrolytes, (b) drying the electrode, (c) contacting the electrode in a solution or suspension containing one or more perfluorocarbon copolymers cation-exchange polymers, (d) drying the coating on the electrode, (e) repeating (c) and (d) until the electrode is sufficiently coated, (f) curing the copolymer coating, (g) cooling the electrode, and (h) hydrating the coating of the electrode.
Claim 10
Dependent Claim
27 words
The method of Claim 7 wherein the metal/metal salt electrode is Ag/Ag n X where X is S, Cl, B or I and n= 1 or 2.
Claim 11
Dependent Claim
55 words
The method of Claim 7 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 12
Dependent Claim
36 words
The method of Claim 7 wherein the electrode is dip coated 2 to 5 times in about a 5% to 15% by weight solution of perfluorocarbon copolymer and air dried for about 15 to 60 minutes.
Claim 13
Dependent Claim
55 words
The method of Claim 10 wherein the electrode is cured by drying the electrode at about 2 to 20 kPa for about 30 to 90 minutes, 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 14
Dependent Claim
26 words
The method of Claim 11 wherein the coating of the electrode is hydrated by boiling in a buffer solution for about 15 to about 45 minutes.
Claim 15
Dependent Claim
17 words
The method of Claim 7 wherein the immobilized electrolyte comprises an at least partially quaternized halogenated polymer.
Claim 16
Dependent Claim
17 words
The method of Claim 13 wherein the immobilized electrolyte is an at least partially quaternized polyvinylbenzyl chloride.
Claim 17
Independent Claim
183 words
A method to make a solid state reference electrode comprising: (a) dip coating a Ag/AgCl electrode in a solution or suspension of at least partially quaternized polyvinylbenzyl chloride, (b) drying the electrode, (c) dipping the electrode in a solution or suspension containing about 5% to 15% by weight of a perfluorocarbon copolymer, (d) drying the coated electrode at room temperature for about 15 to 60 minutes, (e) repeating (a) and (b) from 1 to 5 times, (f) drying the electrode at about 2 to 20 kPa for about 30 to 90 minutes, (g) heating the electrode in the range of about 180°C to 230°C for about 30 to 90 minutes to cure the copolymer coating, and (h) hydrating 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 18
Independent Claim
183 words
A method to make a solid state reference electrode comprising: (a) dip coating a Ag/AgCl electrode in a solution or suspension of at least partially quaternized polyvinylbenzyl chloride, (b) drying the electrode, (c) dipping the electrode in a solution or suspension containing about 5% to 15% by weight of a perfluorocarbon copolymer, (d) drying the coated electrode at room temperature for about 15 to 60 minutes, (e) repeating (a) and (b) from 1 to 5 times, (f) drying the electrode at about 2 to 20 kPa for about 30 to 90 minutes, (g) heating the electrode in the range of about 180°C to 230°C for about 30 to 90 minutes to cure the copolymer coating, and (h) hydrating 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 19
Dependent Claim
71 words
A pH sensor having a sensing portion and a support of electrically nonconductive material comprising: (a) a junction-type solid state metal/metal oxide 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 electrolyte in contact with Ag/AgCl, and (c) a coating of a perfluorocarbon copolymer cation exchange polymer on the sensing portion of the pH sensor.
Claim 20
Dependent Claim
71 words
A pH sensor having a sensing portion and a support of electrically nonconductive material comprising: (a) a junction-type solid state metal/metal oxide 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 electrolyte in contact with Ag/AgCl, and (c) a coating of a perfluorocarbon copolymer cation exchange polymer on the sensing portion of the pH sensor.
Claim 21
Dependent Claim
21 words
The pH sensor of Claim 16 wherein the solid state reference electrode is made according to the method of Claim 7.
Claim 22
Dependent Claim
24 words
The pH sensor of Claim 16 wherein the metal/metal oxide is selected from the group consisting of palladium/palladium oxide, iridium/iridium oxide and titanium/iridium oxide.
Claim 23
Dependent Claim
55 words
The pH sensor of Claim 16 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), tetrafluoroethylene and the second monomer is selected from a group of monomers containing an SO₂F or COF group.
Claim 24
Dependent Claim
68 words
A pH sensor having a sensing portion and a support of electrically nonconductive material comprising: (a) junction-type solid state metal/metal oxide 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,
Claim 25
Dependent Claim
68 words
A pH sensor having a sensing portion and a support of electrically nonconductive material comprising: (a) junction-type solid state metal/metal oxide 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,
Claim 26
Dependent Claim
50 words
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 27
Dependent Claim
50 words
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 28
Dependent Claim
12 words
The solid state electrode made according to the method of Claim 7.
References Cited (Backward Citations)
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