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US4576727A
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Phosphate-free detergent composition for washing of textiles in hard water
Assignee: Deblaueve Lier BV
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Filing: 1984-08-01
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Granted: 1986-03-18
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Expires: 2004-08-01
Abstract
Abstract Method for washing of textiles in hard water and phosphate free detergent compositions for use therein. A method is provided for washing of textiles in hard water under substantial exclusion of phosphates by combined use of an inorganic salt derived from carbondioxide, an acidic compound devoid of forming a precipitate with the calcium and magnesium ions in the washing liquor at usual dosage, and a surface active agent devoid of forming a precipitate under these conditions, maintaining the pH within the range of 5 to 8, and the temperature at at most 70° C. Also provided is a detergent composition comprising the above mentioned components in such a ratio that the pH of a 0.5% by weight solution in a washing liquor is within the range of 5 to 8.
Inventors
- 👤 Gwendolen Browne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:10
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/02; C11D3/04; C11D3/10; C11D3/042; C11D3/046; C11D3/16; C11D3/20; C11D3/2075; C11D3/26; C11D3/33; C11D3/39; C11D3/3942
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
153 words
A substantially phosphate-free detergent composition for washing of textiles in hard water at a temperature of at most 70° C., wherein are comprised (a) at least one watersoluble inorganic salt derived from carbon dioxide, inclusive hydrates, perhydrates and percarbonates thereof (b) at least one acidic compound devoid of formation of a precipitate with calcium and magnesium ions in hard water at usual dosage (c) at least one surface active compound devoid of formation of a precipitate with calcium and magnesium ions in hard water at usual dosage, at least one of the components (a) and (b) being physically separated from the other one, the ratio of these components being such that the pH of a 0.5% by weight solution in a washing liquor remains within the range of 5 to 8 throughout the complete washing cycle and said composition essentially free of components that will precipitate in hard water during the washing process.
Claim 2
Dependent Claim
153 words
A substantially phosphate-free detergent composition for washing of textiles in hard water at a temperature of at most 70° C., wherein are comprised (a) at least one watersoluble inorganic salt derived from carbon dioxide, inclusive hydrates, perhydrates and percarbonates thereof (b) at least one acidic compound devoid of formation of a precipitate with calcium and magnesium ions in hard water at usual dosage (c) at least one surface active compound devoid of formation of a precipitate with calcium and magnesium ions in hard water at usual dosage, at least one of the components (a) and (b) being physically separated from the other one, the ratio of these components being such that the pH of a 0.5% by weight solution in a washing liquor remains within the range of 5 to 8 throughout the complete washing cycle and said composition essentially free of components that will precipitate in hard water during the washing process.
Claim 3
Dependent Claim
17 words
A detergent composition according to claim 1, wherein components (a) and (b) are present in one batch.
Claim 4
Dependent Claim
13 words
A detergent composition according to claim 1, wherein a proteolytic enzyme is present.
Claim 5
Dependent Claim
23 words
A detergent composition according to claim 1, wherein 0.05 to 1% by weight of a sequestrant for iron and trace elements is present.
Claim 6
Dependent Claim
15 words
A detergent composition according to claim 2, wherein all components are present in one batch.
Claim 7
Dependent Claim
23 words
A detergent composition according to claim 1, wherein at least one of the components (a) and (b) is contained in a separate batch.
Claim 8
Dependent Claim
16 words
A detergent composition according to claim 1, wherein it is in the form of a tablet.
References Cited (Backward Citations)
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US4028262A
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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) | 1989-03-17 | 1989-09-16 | 1990-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-17 | 1993-09-16 | 1994-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-17 | 1997-09-16 | 1998-03-18 | $7700.00 | Window Closed / Lapsed |