Stabilized liquid hydrogen peroxide bleach compositions
AssigneeThe Clorox Company
InventorsJames D. Mitchell, James P. Farr
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Abstract
Aqueous peroxide bleaching compositions that include surfactant, fluorescent whiteners and dyes are effectively stabilized by the addition of a heavy metal chelating agent and a free radical scavenging agent. Both agents must be present to achieve maximum stability. Particularly preferred chelating agents are the amino polyphosphonates. Particularly preferred free radical scavenging agents are the hydroxybenzenes and especially substituted phenols. Not only is the peroxide oxidizing agent stabilized, but surfactant, fluorescent whitener, and dye as well.
Claims11
A stabilized liquid peroxide bleaching composition comprising a liquid hydrogen peroxygen component, an organic component selected from fluorescent whiteners, dyes and mixtures thereof, and a stabilizing system comprising 0.02-5.0 wt.% of an amino polyphosphonate as a chelating agent selected for chelating polyvalent heavy metal cations and an effective amount of a partially hindered substituted hydroxybenzene as a free radical scavenging agent, said stabilizing system synergistically increasing stability of said organic component while allowing the peroxygen component to retain most of its initial oxidation potential.
A method for stabilizing aqueous bleach formulations including hydrogen peroxide and an organic component selected from fluorescent whiteners, dyes and mixtures thereof, comprising admixing into said formulations a stabilizing system comprising 0.02-5.0 wt.% of an amino polyphosphonate as a chelating agent selected for chelating polyvalent heavy metal cations and an effective amount of a partially hindered substituted hydroxybenzene as a free radical scavenging agent, said stabilizing system synergistically increasing stability of said organic component while allowing the hydrogen peroxide to retain most of its initial oxidation potential.
Dependencies are inferred from the claim text.