US4784787A
Expired / Lapsed
US
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Method and composition for bleaching laundry
Assignee: Arkema France SA
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Filing: 1987-05-12
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Granted: 1988-11-15
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Expires: 2007-05-12
Abstract
Abstract Bleaching laundry in a bath using a peroxidized compound characterized in that bleaching is carred out at a pH of between 10.5 and 12.5 in the presence of calcium peroxide (CaO 2 ) as the peroxidized compound, introduced in the hydrated or the anhydrous form so that the quantity of calcium per liter of bath is between 1×10 -3 and 1×10 -2 gram-atom.
Inventors
- 👤 Bernard Dubreux
- 👤 Francoise Chosson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:43
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/39; C11D3/3942
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
88 words
A method for bleaching laundry in a bath in the absence of any peroxide activator consisting essentially of introducing into said bath as the only bleaching agent a peroxidized compound and carrying out said bleaching at a pH of between 10.5 and 12.5 and at a temperature between about 30° and 60° C.; said peroxidized compound being a calcium peroxide in the hydrated or the anhydrous form and introduced so that the quantity of calcium per liter of bath is between 1×10 -3 and 1×10 -2 gram atom.
Claim 2
Independent Claim
88 words
A method for bleaching laundry in a bath in the absence of any peroxide activator consisting essentially of introducing into said bath as the only bleaching agent a peroxidized compound and carrying out said bleaching at a pH of between 10.5 and 12.5 and at a temperature between about 30° and 60° C.; said peroxidized compound being a calcium peroxide in the hydrated or the anhydrous form and introduced so that the quantity of calcium per liter of bath is between 1×10 -3 and 1×10 -2 gram atom.
Claim 3
Dependent Claim
16 words
The method of claim 1, wherein the pH of the bath is not more than 11.5.
Claim 4
Dependent Claim
16 words
The method of claim 2, wherein the bath contains a sequestrant for alkaline earth metal ions.
Claim 5
Dependent Claim
34 words
The method of claim 3, wherein the sequestrant for alkaline earth metal ions is in a quantity at least equal to that required for the sequestration of calcium ions in solution in the bath.
Claim 6
Dependent Claim
16 words
The method of claim 4, wherein the sequestrant for alkaline earth metal ions is sodium tripolyphosphate.
Claim 7
Independent Claim
30 words
The method of any one of claims 1 to 5, wherein calcium is employed in the form of a compound which corresponds to the formula CaO 2 ·8H 2 O.
Claim 8
Independent Claim
37 words
The method of any one of claims 1 to 5, wherein the bath contains a detergent and the calcium is employed in the form of a compound which corresponds to the formula CaO 2 ·8H 2 O.
Claim 9
Dependent Claim
48 words
A composition consisting essentially of a detergent and a calcium peroxide in the hydrated or the anhydrous form in a quantity which permits the preparation of a bath which contains, at a pH of between 10.5 and 12.5, 1×10 -3 to 1×10 -2 gram-atom of calcium per liter.
Claim 10
Dependent Claim
48 words
A composition consisting essentially of a detergent and a calcium peroxide in the hydrated or the anhydrous form in a quantity which permits the preparation of a bath which contains, at a pH of between 10.5 and 12.5, 1×10 -3 to 1×10 -2 gram-atom of calcium per liter.
Claim 11
Dependent Claim
26 words
The composition of claim 8, wherein the calcium is employed in the form of a compound which corresponds to the formula CaO 2 ·8H 2 O.
Claim 12
Dependent Claim
14 words
The composition of claim 9 also containing a sequestrant for alkaline earth metal ions.
Claim 13
Dependent Claim
40 words
The composition of claim 10, wherein the sequestrant for alkaline earth metal ions is in a quantity at least equal to that required for the sequestration of the calcium ions in solution in the bath prepared using the said composition.
Claim 14
Dependent Claim
11 words
The composition of claim 11, wherein the sequestrant is sodium tripolyphosphate.
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) | 1991-11-15 | 1992-05-16 | 1992-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-15 | 1996-05-16 | 1996-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-15 | 2000-05-16 | 2000-11-15 | $7700.00 | Window Closed / Lapsed |