US4497725A
Expired / Lapsed
US
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Aqueous bleach compositions
Assignee: Solvay Interox Ltd
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Filing: 1982-02-22
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Granted: 1985-02-05
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Expires: 2002-02-22
Abstract
Abstract The present invention relates to aqueous alkaline bleach compositions containing hydrogen peroxide. Under alkaline conditions, it is particularly difficult to prevent the hydrogen peroxide decomposing excessively rapidly during storage, but the addition of an alkaline additive minimizes any change in the pH of washing solutions obtained by dissolution of generally bleach free washing compositions containing anionic surfactants. Hydrogen peroxide-containing aqueous alkaline bleach having acceptable peroxide stability can be obtained by employing ethanol or isopropanol in conjunction with a phosphonate, especially ethylene (diamino tetramethylene phosphonate,) particularly with a polyhydroxy carboxylate, preferably gluconate, or an amino acetate. The liquid bleach can contain a small proportion of a surfactant.
Inventors
- 👤 Eileen Smith
- 👤 Doreen A. Timperley
- 👤 Dorothy M. Titchener
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:37
CPC Classifications
C; C01; C01B; C01B15/00; C01B15/01; C01B15/037; C11; C11D; C11D3/00; C11D3/39; C11D3/3902; C11D3/3937; C11D3/394; C11D3/3947
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
73 words
A liquid bleach composition comprising: 3% to 20% by weight hydrogen peroxide; at least one base in an amount sufficient to render the composition alkaline; 5% to 20% by weight isopropanol; a stabilising amount of a substituted amino compound having the formula R--NR--(CH 2 ) p --q--NR 2 in which p is from 2 to 6, q is from 0 to 2, and R represents an acetate or methylene phosphonate group; and water.
Claim 2
Dependent Claim
73 words
A liquid bleach composition comprising: 3% to 20% by weight hydrogen peroxide; at least one base in an amount sufficient to render the composition alkaline; 5% to 20% by weight isopropanol; a stabilising amount of a substituted amino compound having the formula R--NR--(CH 2 ) p --q--NR 2 in which p is from 2 to 6, q is from 0 to 2, and R represents an acetate or methylene phosphonate group; and water.
Claim 3
Dependent Claim
18 words
A composition according to claim 1 having a pH in the range of from pH 8 to 9.5.
Claim 4
Dependent Claim
31 words
A composition according to claim 1 or 2 wherein said substituted amino compound is substituted by methylene phosphonate groups, and is present in an amount of at least 0.1% by weight.
Claim 5
Dependent Claim
23 words
A composition according to claim 3 wherein said substituted amino compound is present in an amount of from 0.1 to 0.4% by weight.
Claim 6
Dependent Claim
19 words
A composition according to claims 1, 2 or 3 wherein said amino compound comprises ethylene diamino tetra (methylene phosphonate).
Claim 7
Dependent Claim
20 words
A composition according to claim 1 further comprising a stabilizing amount of a linear C 5 -C 9 polyhydroxy carboxylate.
Claim 8
Dependent Claim
13 words
A composition according to claim 6 wherein said polyhydroxy carboxylate comprises a gluconate.
Claim 9
Dependent Claim
28 words
A composition according to claim 6 or 7 wherein said polyhydroxy carboxylate is present in a weight ratio to the substituted amino compound of from 3:1 to 1:3.
Claim 10
Dependent Claim
22 words
A composition according to claim 8 wherein said hydrogen peroxide is present in an amount of from 5 to 8% by weight.
Claim 11
Dependent Claim
21 words
A composition according to claim 1 further comprising a surfactant present in an amount of from 0.5 to 2.5% by weight.
Claim 12
Dependent Claim
29 words
A composition according to claim 10 wherein said surfactant comprises at least one member selected from the group consisting of an alkyl benzene sulphonate and a non-ionic alcohol ethoxylate.
Claim 13
Dependent Claim
38 words
A composition according to claim 11 wherein said hydrogen peroxide is present in an amount of 5 to 8%; and said substituted amino compound comprises ethylene diamine tetra acetate and is present in an amount of about 1%.
Claim 14
Dependent Claim
73 words
A composition according to claim 12 wherein said hydrogen peroxide is present in an amount of 5% to 8%; said substituted amino compound is present in an amount of about 0.1 to 0.4% and is selected from the group consisting of ethylene diamine tetra methylene phosphonate, hexamethylene diamine tetra methylene phosphonate, and diethylene triamine penta methylene phosphonate; and wherein said composition further comprises 0.1 to 0.4% by weight of an alkali metal gluconate.
Claim 15
Dependent Claim
22 words
A composition according to claim 13 wherein said gluconate is present in a weight ratio to said phosphonate of 1:1 to 2:1.
Claim 16
Dependent Claim
17 words
A process of bleaching comprising contacting an article to bleached with a composition according to claim 1.
Claim 17
Dependent Claim
17 words
A process according to claim 15 wherein said composition is diluted with water prior to said contacting.
Claim 18
Dependent Claim
27 words
A process of cleaning comprising contacting an article to be cleaned with a washing composition to which has been added a bleach composition according to claim 1.
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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) | 1988-02-05 | 1988-08-06 | 1989-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-05 | 1992-08-06 | 1993-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-05 | 1996-08-06 | 1997-02-05 | $7700.00 | Window Closed / Lapsed |