EP0168253A2
Expired / Lapsed
EP
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Controlled generation hypochlorite compositions and method
Assignee: Clorox Co
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Filing: 1985-07-11
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Granted: —
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Expires: 2005-07-11
Abstract
Abstract A dry bleaching composition, particularly useful for low temperature applications, is provided in which generation of hypochlorite by reaction between a peroxygen bleaching agent and a chloride salt is promoted by an aromatic diol or oxidized aromatic diol activator. Preferred activators are in ester form and provide hypochlorite generation at levels of less than about 20 ppm for at least about the first two minutes following dissolution of the compositions in aqueous solution, but rising to effective bleaching levels within a reasonable time thereafter. The initially low hypochlorite level assists in the functioning of laundry additives, such as fabric brighteners.
Inventors
- 👤 Ronald Augustus Fong
- 👤 Victor Michael Casella
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 07:44
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/395; C11D3/3951
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
66 words
A bleaching composition comprising: a peroxygen bleaching agent; a water-soluble halide salt; and an activator, or precursor thereof hydrolysable to the activator in aqueous solution, which activator promotes reaction in an aqueous solution between the peroxgen bleaching agent and the halide salt to produce hypohalite therefrom, the activator or its precursor consisting essentially of an aromatic diol, an oxidized aromatic diol, or a hydrolyzable ester thereof.
Claim 2
Dependent Claim
66 words
A bleaching composition comprising: a peroxygen bleaching agent; a water-soluble halide salt; and an activator, or precursor thereof hydrolysable to the activator in aqueous solution, which activator promotes reaction in an aqueous solution between the peroxgen bleaching agent and the halide salt to produce hypohalite therefrom, the activator or its precursor consisting essentially of an aromatic diol, an oxidized aromatic diol, or a hydrolyzable ester thereof.
Claim 3
Dependent Claim
112 words
A bleaching composition according to claim 1 wherein: the peroxygen bleaching agent is selected from water-soluble monopersulfates and/or water-soluble monoperphosphates, and is from about 5 wt % to about 80 wt % of the composition; the halide is a chloride, and is from about 10 wt % to about 70 wt % of the composition; the activator or precursor is from about 0.1 wt % to about 10.0 wt % of the composition, and includes the structure: wherein one of R 1 and R 2 is hydrogen or a substituted or unsubstituted alkyl group and the other of R l and R 2 is hydrogen or a substituted or unsubstituted alkyl group.
Claim 4
Dependent Claim
81 words
A dry composition, useful for bleaching in laundry solutions, comprising: from about 25 wt % to about 65 wt of a water-soluble monopersulfate; from about 35 wt % to about 45 wt % of a water-soluble chloride salt; and from about 0.5 wt % to about 2 wt % of an activator precursor which is a hydroquinone precursor hydrolyzable in aqueous solutions to a hydroquinone, the hydroquinone promoting reaction between the monopersulfate and the chloride salt with formation of hypochlorite therefrom.
Claim 5
Dependent Claim
81 words
A dry composition, useful for bleaching in laundry solutions, comprising: from about 25 wt % to about 65 wt of a water-soluble monopersulfate; from about 35 wt % to about 45 wt % of a water-soluble chloride salt; and from about 0.5 wt % to about 2 wt % of an activator precursor which is a hydroquinone precursor hydrolyzable in aqueous solutions to a hydroquinone, the hydroquinone promoting reaction between the monopersulfate and the chloride salt with formation of hypochlorite therefrom.
Claim 6
Dependent Claim
32 words
The composition as in claim 3 wherein the hydroquinone precursor has at least one acyl group linked to a phenyl group via an ester linkage, preferably two acyl groups in para positions.
Claim 7
Dependent Claim
27 words
A composition as in any of claims 2-4 wherein the ring of the hydroquinone has a sulfonate, carboxylate, methyl, or t-butyl substituted thereon at an ortho position.
Claim 8
Dependent Claim
42 words
A composition as in any one of the preceding claims further comprising a buffering agent in an amount sufficient to maintain a pH within the range of from about 8 to about 11 when the composition is dissolved in an aqueous solution.
Claim 9
Dependent Claim
135 words
A low temperature, dry bleaching composition comprising: from about 35 wt % to about 65 wt % of a water-soluble peroxygen bleaching agent; from about 35 wt % to about 45 wt % of a water-soluble chloride salt; from about 0.75 wt % to about 1.5 wt % of an activator precursor having the structure wherein one of R 1 and R 2 is an alkyl group having at least 2 to about 8 carbon atoms and the other is hydrogen or an alkyl group having at least 2 to about 8 carbon atoms, and R is hydrogen, sulfonate, carboxylate, methyl, or t-butyl; and, from about 15 wt.% to about 35 wt.% of a buffering agent to maintain a pH of the composition during use within the range of from about 9 to about 10.5.
Claim 10
Dependent Claim
135 words
A low temperature, dry bleaching composition comprising: from about 35 wt % to about 65 wt % of a water-soluble peroxygen bleaching agent; from about 35 wt % to about 45 wt % of a water-soluble chloride salt; from about 0.75 wt % to about 1.5 wt % of an activator precursor having the structure wherein one of R 1 and R 2 is an alkyl group having at least 2 to about 8 carbon atoms and the other is hydrogen or an alkyl group having at least 2 to about 8 carbon atoms, and R is hydrogen, sulfonate, carboxylate, methyl, or t-butyl; and, from about 15 wt.% to about 35 wt.% of a buffering agent to maintain a pH of the composition during use within the range of from about 9 to about 10.5.
Claim 11
Dependent Claim
21 words
A composition as in any one of the preceding claims wherein the activator precursor is a substituted or unsubstituted p-phenylene diacetate.
Claim 12
Dependent Claim
56 words
A composition as in any one of claims 3 to 8 wherein the formation of hypochlorite is at a level of less than about 20 ppm for at least about 2 minutes following dissolution of the composition in aqueous solution, and the hypochlorite formed within about 12 minutes following dissolution is at least about 20 ppm.
Claim 13
Dependent Claim
38 words
A composition as claimed in claim 9 wherein the hypochlorite is in the range of between about 20 to about 60 ppm from about 2 minutes to about 12 minutes after dissolution of the composition in aqueous solution.
Claim 14
Dependent Claim
28 words
A composition as in any one of the preceding claims further comprising an optical brightening agent, an enzyme, a surfactant, another laundry additive, a dessicant, or mixtures thereof.
Claim 15
Dependent Claim
22 words
A composition as in any one of the preceding claims wherein the activator or precursor is coated upon a water soluble substrate.
Claim 16
Dependent Claim
17 words
The composition as in claim 12 wherein the water soluble substrate includes the water soluble chloride salt.
Claim 17
Dependent Claim
19 words
14 . The composition as in claim 12 or claim 13 wherein the water soluble substrate carries surfactant thereon.
Claim 18
Independent Claim
61 words
A method for bleaching fabrics comprising: cojointly dissolving a peroxygen compound, a chloride salt and an activator precursor, as individually defined in any of the preceding claims, in an aqueous solution at a temperature of from about 20°C to about 38°C; and contacting fabrics with said solution, preferably for at least about 2 minutes, more preferably at least about 6 minutes.
Claim 19
Dependent Claim
68 words
16, The method as in claim 15 wherein the peroxygen compound includes potassium monopersulfate and the dissolving provides from about 1.25 x 10 -3 M to about 2.5 x 10 -3 M monopersulfate, from about 7.5 x 10 -3 M to about 2.0 x 10- 2 M chloride, and from about 5.0 x 10 -5 M to about 1.0 x 10 -4 M activator precursor in said solution.
References Cited (Backward Citations)
No citation records indexed.
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