US4287042A
Expired / Lapsed
US
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Ion-selective electrode and method of making said electrode
Assignee: NATIONAL RESEARCH DEVELOPMENT Corp A BRITISH CORPORATION
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Filing: 1980-03-06
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Granted: 1981-09-01
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Expires: 2000-03-06
Abstract
Abstract An ion-selective electrode comprises a standard solution of the ion, such as calcium, and, retaining the solution, a membrane including sensor groups. The sensor groups are secured in the membrane by cross-linking. The membrane may be a styrene-butadiene-styrene triblock elastomeric copolymer, with dialkyl phosphate cross-linked sensor groups resulting from a cross-linking reaction between the membrane and diallyl phosphoric acid.
Inventors
- 👤 Leslie C. Ebdon
- 👤 Andrew T. Ellis
- 👤 George C. Corfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:28
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/28; G01N27/30; G01N27/333; G01N27/3335
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
66 words
An ion-selective electrode comprising a standard solution of the ion and, retaining the solution, a membrane comprising an unsaturated organic polymer having sensor groups covalently bonded to said polymer, characterized in that the unsaturated organic polymer is cross-linked at least in part through a covalently-bonded sensor group of the formula ##STR2## where A and B are unsaturated moieties cross-linking the polymer, whereby the electrode is calcium-selective.
Claim 2
Dependent Claim
66 words
An ion-selective electrode comprising a standard solution of the ion and, retaining the solution, a membrane comprising an unsaturated organic polymer having sensor groups covalently bonded to said polymer, characterized in that the unsaturated organic polymer is cross-linked at least in part through a covalently-bonded sensor group of the formula ##STR2## where A and B are unsaturated moieties cross-linking the polymer, whereby the electrode is calcium-selective.
Claim 3
Dependent Claim
17 words
An ion-selective electrode according to claim 1, characterised in that the membrane comprises an unsaturated linear polymer.
Claim 4
Dependent Claim
19 words
An ion-selective electrode according to claim 2, characterised in that the unsaturated linear polymer is a styrene-butadiene-styrene triblock copolymer.
Claim 5
Dependent Claim
15 words
An ion-selective electrode according to claim 1, characterised in that the membrane displays elastomeric properties.
Claim 6
Dependent Claim
17 words
An ion-selective electrode according to claim 1, characterised in that the membrane contains a covalently bound mediator.
Claim 7
Dependent Claim
17 words
An ion-selective electrode according to claim 5, characterised in that the mediator is cross-linked to the membrane.
Claim 8
Dependent Claim
15 words
An ion-selective electrode according to claim 5, characterised in that the mediator is methyl methacrylate.
Claim 9
Dependent Claim
19 words
An ion-selective electrode according to claim 1, characterised in that the sensor group is an organophosphate or an organophosphonate.
Claim 10
Dependent Claim
16 words
An ion-selective electrode according to claim 9, characterised in that the sensor group is dialkyl phosphate.
Claim 11
Dependent Claim
33 words
A method of making the ion-selective electrode of claim 9, characterised in that the dialkyl phosphate is made directly from a cross-linking reaction of diallyl phosphoric acid with the membrane yielding dialkyl phosphate.
Claim 12
Dependent Claim
44 words
A method of making the ion-selective electrode of claim 9, characterized in that the dialkyl phosphate is made indirectly from a cross-linking reaction of a compound selected from the group consisting of triallyl phosphate, tri(ω-undecenyl)phosphate and diallyl phenylphosphonate with the membrane yielding trialkyl phosphate.
Claim 13
Dependent Claim
15 words
A method according to claim 11, characterised in that the cross-linking reaction is free-radical initiated.
Claim 14
Dependent Claim
16 words
A method according to claim 12, characterised in that α,α-azobisisobutyronitrile is present as a free-radical initiator.
Claim 15
Dependent Claim
25 words
A method according to claim 12, characterised in that the proportion of free-radical initiator is 1 to 5% by weight with respect to the membrane.
Claim 16
Dependent Claim
18 words
A method according to claim 14, characterised in that the said proportion is 2 to 3% by weight.
Claim 17
Dependent Claim
17 words
A method according to claim 12, characterised in that the free radicals are generated by ultra-violet irradiation.
Claim 18
Dependent Claim
23 words
A method according to claim 11, characterised in that the cross-linking reaction is followed by hydrolysis converting the trialkyl phosphate to dialkyl phosphate.
Claim 19
Dependent Claim
16 words
A method according to claim 17, characterised in that the hydrolysis lasts at least 1 hour.
Claim 20
Dependent Claim
16 words
A method according to claim 18, characterised in that the hydrolysis lasts at least 3 hours.
Claim 21
Dependent Claim
16 words
A method according to claim 19, characterised in that the hydrolysis lasts at least 4 hours.
Claim 22
Dependent Claim
16 words
A method according to claim 17, characterised in that the hydrolysis lasts up to 20 hours.
Claim 23
Dependent Claim
16 words
A method according to claim 21, characterised in that the hydrolysis lasts up to 10 hours.
Claim 24
Dependent Claim
24 words
A method according to claim 18, characterised in that the hydrolysis is by aqueous alkali in a concentration of up to 20% by weight.
Claim 25
Dependent Claim
21 words
A method according to claim 17, characterised in that the hydrolysis is by up to 8% by weight alkali in alcohol.
Claim 26
Dependent Claim
32 words
A method according to claim 11, characterised in that the phosphate according to the cross-linking reaction is present in a proportion of 0.3 to 10% by weight with respect to the membrane.
Claim 27
Dependent Claim
16 words
A method according to claim 25, wherein the said proportion is 4 to 6% by weight.
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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) | 1984-08-31 | 1985-03-02 | 1985-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-31 | 1989-03-02 | 1989-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-31 | 1993-03-02 | 1993-09-01 | $7700.00 | Window Closed / Lapsed |