US5324477A
Expired / Lapsed
US
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Process for disinfecting hard surfaces with chlorine dioxide
Assignee: Henkel AG and Co KGaA
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Filing: 1990-08-21
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Granted: 1994-06-28
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Expires: 2010-08-21
Abstract
Abstract Method for disinfecting hard surfaces by treating the hard surfaces with an aqueous composition containing from 2 to 40% by weight of a sodium chlorite and from 1 to 60% by weight of at least one nitrogen-free acidic scale inhibiting agent. The composition generates chlorine dioxide in situ and also acts as a water hardness stabilizer and corrosion inhibitor.
Inventors
- 👤 Karl-Heinz Schroeder
- 👤 Wolfgang Falter
- 👤 Walter Grosse-Boewing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:28
CPC Classifications
A; A01; A01N; A01N59/00; A61; A61L; A61L2/00; A61L2/16; A61L2/18
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
171 words
A method for disinfecting a hard surface comprising contacting said hard surface with an aqueous composition comprising (a) from 2 to 40% by weight of sodium chlorite, (b) from 1 to 60% by weight of at least one nitrogen-free acidic scale inhibiting agent selected from the group consisting of a phosphonic acid, polyphosphoric acid, acrylic acid, methacrylic acid, polyacrylic acid, and polymethacrylic acid, wherein a 1% aqueous solution of the at least one scale inhibiting agent has a pH of less than 7, and wherein this component acts as an acidic component to produce a chlorine dioxide concentration in the aqueous composition of from 0.1 to 500 ppm and also functions as a water hardness stabilizer and metal corrosion inhibitor, and (c) at least one carboxylic acid selected from the group consisting of tartaric acid, malic acid, oxalic acid, maleic acid, malonic acid, succinic acid, adipic acid, glycolic acid, lactic acid, gluconic acid, and citric acid, wherein the molar ratio of component b) to component c) is from 10:1 to 1:10.
Claim 2
Independent Claim
171 words
A method for disinfecting a hard surface comprising contacting said hard surface with an aqueous composition comprising (a) from 2 to 40% by weight of sodium chlorite, (b) from 1 to 60% by weight of at least one nitrogen-free acidic scale inhibiting agent selected from the group consisting of a phosphonic acid, polyphosphoric acid, acrylic acid, methacrylic acid, polyacrylic acid, and polymethacrylic acid, wherein a 1% aqueous solution of the at least one scale inhibiting agent has a pH of less than 7, and wherein this component acts as an acidic component to produce a chlorine dioxide concentration in the aqueous composition of from 0.1 to 500 ppm and also functions as a water hardness stabilizer and metal corrosion inhibitor, and (c) at least one carboxylic acid selected from the group consisting of tartaric acid, malic acid, oxalic acid, maleic acid, malonic acid, succinic acid, adipic acid, glycolic acid, lactic acid, gluconic acid, and citric acid, wherein the molar ratio of component b) to component c) is from 10:1 to 1:10.
Claim 3
Dependent Claim
39 words
The method of claim 1 wherein in the aqueous composition a 1% aqueous solution of component b) has a pH of less than 3, and the chlorine dioxide concentration in the aqueous composition is from 0.1 to 100 ppm.
Claim 4
Dependent Claim
18 words
The method of claim 2 wherein component b) is at least one of 1-hydroxyethane-1,1-diphosphonic acid and 2-phosphonobutane-1,2,4-tricarboxylic acid.
Claim 5
Dependent Claim
24 words
The method of claim 1 wherein in the aqueous composition component b) is present in the composition in from 15 to 25% by weight.
Claim 6
Dependent Claim
22 words
The method of claim 1 wherein the aqueous composition contains more than the theoretical quantity of component b) based on component a).
Claim 7
Dependent Claim
20 words
The method of claim 1 wherein the chlorine dioxide concentration in the aqueous composition is between 0.1 and 20 ppm.
Claim 8
Dependent Claim
16 words
The method of claim 6 wherein the chlorine dioxide concentration is between 0.5 and 5 ppm.
Claim 9
Dependent Claim
18 words
The method of claim 1 wherein component c) of the aqueous composition is lactic acid or citric acid.
Claim 10
Dependent Claim
14 words
The method of claim 1 wherein the aqueous composition also contains a Lewis acid.
Claim 11
Dependent Claim
19 words
The method of claim 9 wherein the Lewis acid is a sulfate, nitrate, or chloride of iron or aluminum.
Claim 12
Dependent Claim
23 words
The method of claim 9 wherein the molar ratio of component b) plus c) to the Lewis acid is from 1:2 to 3:1.
Claim 13
Dependent Claim
19 words
The method of claim 1 wherein the ratio of component b) to component c) is from 2:1 to 1:2.
Claim 14
Dependent Claim
61 words
The method of claim 1 wherein in the aqueous composition a 1% solution of component b) has a pH of less than 3; the chlorine dioxide concentration is from 0.1 to 20 ppm; component b) is present in the composition in from 15 to 25% by weight; and the ratio of component b) to component c) is from 2:1 to 1:2.
Claim 15
Dependent Claim
27 words
The method of claim 13 wherein component b) is at least one of 1-hydroxyethane-1,1-diphosphonic acid and 2-phosphonobutane-1,2,4-tricarboxylic acid and component c) is lactic acid or citric acid.
Claim 16
Dependent Claim
35 words
The method of claim 13 wherein a Lewis acid is also present in the aqueous composition in a molar ratio of component b) plus component c) to the Lewis acid of from 1:2 to 3:1.
References Cited (Backward Citations)
JPS5182080A
Cited
WO1983001940A1
Cited
DE3218649A1
Cited
US4681739A
Cited
WO1984001507A1
Cited
US4504442A
Cited
JPS59187668A
Cited
JPS6054923A
Cited
EP0153841A2
Cited
WO1985004107A1
Cited
JPS60259671A
Cited
JPS60259571A
Cited
US4731193A
Cited
US4747975A
Cited
JPS61145300A
Cited
JPS638203A
Cited
JPS63161903A
Cited
JPH01171425A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-06-27 | 1997-12-27 | 1998-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-06-27 | 2001-12-27 | 2002-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-06-27 | 2005-12-27 | 2006-06-28 | $7700.00 | Window Closed / Lapsed |