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US4473650A
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US
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Use of strong organic acid polyelectrolyte salts in test means, test device and method for determining the ionic strength or specific gravity of a liquid sample
Assignee: Bayer Corp
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Filing: 1982-12-27
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Granted: 1984-09-25
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Expires: 2002-12-27
Abstract
Abstract An improved test means, device and method for determining the ionic strength or specific gravity of an aqueous sample are disclosed. The test means comprises a weakly basic polyelectrolyte polymer salt and an indicator means capable of producing a detectable response to ion exchange between the polymer salt and the test sample. The polymer salt is one in which one or more of the basic moieties of the polymer is present as the salt of a strong organic acid.
Inventors
- 👤 Joseph Y. Wang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:33
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/52; G01N9/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
69 words
In a test means for determining the ionic strength or specific gravity of an aqueous test sample, wherein the test means comprises a weakly basic polyelectrolyte polymer, and an indicator means capable of producing a detectable response to ion exchange between said polyelectrolyte and said sample; the improvement wherein 20 to 60% of the basic moieties of said polyelectrolyte is present as a salt of a strong organic acid.
Claim 2
Dependent Claim
69 words
In a test means for determining the ionic strength or specific gravity of an aqueous test sample, wherein the test means comprises a weakly basic polyelectrolyte polymer, and an indicator means capable of producing a detectable response to ion exchange between said polyelectrolyte and said sample; the improvement wherein 20 to 60% of the basic moieties of said polyelectrolyte is present as a salt of a strong organic acid.
Claim 3
Dependent Claim
28 words
The improved test means of claim 1 in which about 50% of the basic moieties of said polymer are in the form of a salt of said acid.
Claim 4
Dependent Claim
18 words
The improved test means of claim 1 in which the polyelectrolyte is poly(ethyleneimine), poly(vinylamine), poly(aminostyrene) or copolymers thereof.
Claim 5
Dependent Claim
13 words
The improved test means of claim 1 in which the polyelectrolyte is poly(ethyleneimine).
Claim 6
Dependent Claim
25 words
The improved test means of claim 1 in which the acid has an acidity constant, K a , of at least about 1×10 -2 .
Claim 7
Dependent Claim
17 words
The improved test means of claim 1 in which the acid is benzenesulfonic acid or trichloroacetic acid.
Claim 8
Dependent Claim
20 words
The improved test means of any one of claims 1-6 in which the indicator means is a pH indicator substance.
Claim 9
Dependent Claim
15 words
The improved test means of claim 7 in which the pH means is bromothymol blue.
Claim 10
Dependent Claim
30 words
A test device for determining the ionic strength or specific gravity of an aqueous test sample, the device comprising a carrier matrix incorporated with the test means of claim 7.
Claim 11
Independent Claim
35 words
A method for determining the ionic strength or specific gravity of an aqueous test sample, the method comprising contacting the sample with the test means any one of claims 1-6 and observing a detectable response.
Claim 12
Dependent Claim
33 words
A method for determining the ionic strength or specific gravity of an aqueous test sample, the method comprising contacting the sample with the test device of claim 9 and observing a detectable response.
Claim 13
Independent Claim
72 words
A method for preparing a test device for determining the ionic strength or specific gravity of an aqueous test sample, the method comprising the steps of reacting a weakly basic polyelectrolyte polymer with sufficient strong organic acid to form a salt of about 20 to 60% of the basic moieties of the polyelectrolyte, thereby forming a polyelectrolyte salt, and incorporating a carrier matrix with the polyelectrolyte salt and a pH indicator substance.
Claim 14
Independent Claim
72 words
A method for preparing a test device for determining the ionic strength or specific gravity of an aqueous test sample, the method comprising the steps of reacting a weakly basic polyelectrolyte polymer with sufficient strong organic acid to form a salt of about 20 to 60% of the basic moieties of the polyelectrolyte, thereby forming a polyelectrolyte salt, and incorporating a carrier matrix with the polyelectrolyte salt and a pH indicator substance.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-09-25 | 1988-03-26 | 1988-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-25 | 1992-03-26 | 1992-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-25 | 1996-03-26 | 1996-09-25 | $7700.00 | Window Closed / Lapsed |