Stabilizing system for liquid hydrogen peroxide compositions
AssigneeThe Clorox Company
InventorsJames P. Farr, Daniel T. Carty
Life of this patent
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Abstract
Aqueous peroxide bleaching compositions including organic components such as surfactants, fluorescent whiteners and dyes are effectively stabilized by the addition of a stabilizing system comprising stabilizing effective amounts of a heavy metal chelating or sequestering agent and an aromatic amine free radical scavenging agent. Both agents must be present to achieve maximum stability. The aromatic amine free radical scavenging agent is preferably a primary or secondary aryl amine having at least one hydrogen on the nitrogen of the amine. The stabilizing system stabilizes the organic component as well as the peroxide oxidizing agent.
Claims22
A colored liquid peroxide bleaching composition, stabilizing against a loss of activity of a dye or a fluorescent whitening agent, comprising an aqueous composition comprising 0.05-50 wt.% of a peroxygen component, an organic component comprising 0-50 wt. % of the compositions as surfactants, several hundredths to about 5 wt. % of the composition as fluorescent whitening agent, 0.0002-1 wt. % of the composition as a dye, and mixtures thereof, and a stabilizing system comprising (a) a phosphonate or an aminopolyphosphonate as a chelating agent comprising about 0.02-5 wt. % of the composition and an aromatic amine free radical scavenging agent selected from the group consisting of substituted diarylamines, p-phenylenediamines, substituted dihydroquinolines, naphthylamines, and mixtures thereof in an amount effective to provide effective free radical scavenging.
A method for stabilizing colored aqueous hydrogen peroxide formulations comprising 0.05-50 wt. % of a peroxygen component, an organic component comprising 0-50 wt. % of the composition as surfactants, several hundredths to about 5 wt. % of the composition as fluorescent whitening agent, 0.0002-1 wt. % of the composition as a dye, and mixtures thereof against loss of activity of a dye or fluorescent whitening agent, the method comprising admixing into the formulation a phosphonate or an aminopolyphosphonate as a chelating agent comprising about 0.02-5 wt. % of the formulation and an aromatic amine free radical scavenging agent selected from the group consisting of substituted dihydroquinolines, naphthylamines, and mixtures thereof in an amount effective to provide effective free radical scavenging.
An improved stabilizing system for a colored peroxide containing liquid composition including an organic component comprising 0-50 wt. % of the composition as surfactants, several hundredths to about 5 wt. % of the composition as fluorescent whitening agent, 0.0002-1 wt. % of the composition as a dye, and mixtures thereof, the stabilizing system comprising a phosphonate or aminopolyphosphonate as a chelating agent comprising about 0.02-5 wt. % of the composition and an aromatic amine free radical scavenging agent selected from the group consisting of substituted dihydroquinolines, naphthylamines, and mixtures thereof in an amount effective to provide effective free radical scavenging.
Dependencies are inferred from the claim text.