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US 4,900,469 AGranted
Thickened peracid precursor compositions
AssigneeThe Clorox Company
InventorsJames P. Farr, Daniel T. Carty
Life of this patent
Estimating the term…
Abstract
A thickened cleaning composition for laundry products incorporates low levels of a fluorescent whitening agent or dye, a surfactant, an acidic pH adjusting agent and an insoluble peracid precursor. At the acidic pH, the fluorescent whitening agent precipitates as a colloidal particle, and is stabilized by associating with the surfactant, resulting in thickening. The precursor is stably suspended in its inactive form in the thickener, and provides oxidizing power as the corresponding peracid is formed when added to an alkaline wash or rinse solution. The composition preferably is formulated with an acidic soluble bleach source and most preferably with a peroxygen bleach.
Claims18
A thickened cleaning composition comprising, in aqueous solution
- (a) a surfactant, present in an amount of about 1 to 20 percent by weight and selected from the group consisting of nonionics, betaines, alkyl aryl sulfonates and mixtures thereof;
- (b) an acid-insoluble fluorescent whitening agent, selected from the group consisting of stilbene disulfonic acid FWA's substituted with a protonizable group, substituted biphenyl diazo dyes, and mixtures thereof, and having a molecular weight of between about 500-1500, a potential for a zwitterionic charge distribution in an acid medium and which is an insoluble colloidal sized particle in an acid medium, the fluorescent whitening agent being present in an amount of between about 0.1 and 10 weight percent;
- (c) a pH adjusting agent in an amount sufficient to result in a pH of about 6 or below and precipitate the fluorescent whitening agent as a colloidal particle and whereby a homogeneous composition results;
- and
- (d) a peracid precursor, insoluble at a neutral or acidic pH, and soluble at an alkaline pH.
2 more elements
A thickened peroxygen bleaching composition comprising, in aqueous solution
- (a) a peroxygen bleach, present in a bleaching-effective amount;
- (b) a peracid precursor, insoluble at a neutral or acidic pH and soluble at an alkaline pH;
- and
- (c) a thickening system comprising an FWA-stabilizing amount of a surfactant selected from the group consisting of nonionics, betaines, alkyl aryl sulfonates and mixtures thereof, about 0.1 to 10.0 weight percent of an acid-insoluble fluorescent whitening agent selected from the group consisting of stilbene disulfonic acid FWAs substituted with a protonizable group, substituted biphenyl diazo dyes, and mixtures thereof, and having a molecular weight of between about 500-1500, a potential for a zwitterionic charge distribution and which is an insoluble colloidal particle in an acidic medium, and a pH adjusting agent in an amount sufficient to result in a pH of about 6 or below and precipitate the fluorescent whitening agent whereby a homogeneous composition results.
1 more element
A chemical stabilized, thickened peroxygen bleaching composition comprising, in aqueous solution
- (a) a peroxygen bleach, present in a bleaching-effective amount;
- (b) a chemical stabilizing system comprising a antioxidant and a chelating agent;
- (c) a peracid precursor, insoluble at a neutral or acidic pH and soluble at an alkaline pH;
- and
- (d) a thickening system comprising an FWA-stabilizing amount of a surfactant selected from the group consisting of nonionics, betaines, alkyl aryl sulfonates and mixtures thereof, about 0.1 to 10.0 weight percent of an acid-insoluble fluorescent whitening agent selected from the group consisting of stilbene disulfonic acid FWAs substituted with a protonizable group, substituted biphenyl diazo dyes, and mixtures thereof, and having a molecular weight of between about 500-1500, a potential for a zwitterionic charge distribution and which is an insoluble colloidal particle in an acidic medium, and a pH adjusting agent in an amount sufficient to result in a pH of about 6 or below and precipitate the fluorescent whitening agent whereby a homogeneous composition results.
2 more elements
A method for preparing a thickened, pourable cleaning composition, the method comprising
- (a) preparing an aqueous solution of a FWA-stabilizing amount of an acid-compatible and bleach resistant surfactant, selected from the group consisting of nonionics having an HLB value of between about 11-13, betaines, alkyl aryl sulfonates and mixtures thereof;
- (b) adding to the solution of (a) about 0.1-10.0 weight percent of an acid insoluble fluorescent whitening agent selected from the group consisting of stilbene disulfonic acid FWAs substituted with a protonizable group, substituted biphenyl diazo dyes, and mixtures thereof, and having a molecular weight of between about 500-1500, a potential for a zwitterionic charge distribution, and which precipitates as an insoluble colloidal particle in an acidic medium, the fluorescent whitening agent being initially soluble in the solution of (a);
- (c) adding sufficient pH adjusting agent to the solution of (b) to result in a pH of between about 2 and 6 and to cause the fluorescent whitening agent to precipitate resulting in a dispersion;
- and
- (d) adding to the dispersion of (c) a quantity of a peracid precursor insoluble at a neutral or acidic pH and soluble at an alkaline pH.
2 more elements
A thickened peracid bleaching composition comprising, in aqueous solution
- (a) a peracid bleach, present in a bleaching-effective amount;
- (b) about 0.1 to 10.0 weight percent of an acid-insoluble fluorescent whitening agent, selected from the group consisting of stilbene disulfonic acid FWAs substituted with a protonizable group, substituted biphenyl diazo dyes, and mixtures thereof, and having a molecular weight of between about 500-1500, a potential for a zwitterionic charge distribution and which is a colloidal-sized particle in an acidic medium;
- (c) a pH adjusting agent in an amount sufficient to result in a pH of about 6 or below and precipitate the fluorescent whitening agent as a colloidal particle and whereby a homogeneous suspension results;
- (d) an FWA-stabilizing amount of a surfactant selected from the group consisting of nonionics, betaines, alkyl aryl sulfonates and mixtures thereof;
- and
- (e) a peracid precursor, insoluble at a neutral or acidic pH and soluble at an alkaline pH.
3 more elements
Dependencies are inferred from the claim text.