Liquid persalt bleach compositions containing tartrazine as the stabilizer
AssigneeU.S. Borax Inc.
InventorWilliam G. Woods
Life of this patent
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Abstract
Stable, concentrated aqueous persalt solutions are provided in which the stabilizing agent is an arylazo compound, such as tartrazine, having an ortho-hydroxy substituent on the aryl group. Preferred compositions contain sodium perborate and a solubilizing agent as well as the azo stabilizer.
Claims11
A stable, concentrated aqueous persalt bleach solution having a pH of a persalt selected from the group consisting of about 5 to 8 comprising about 5 to 30% of sodium perborate and sodium percarbonate, about 3 to 30% solubilizing agent, about 0.001 to 1.0% of an azo stabilizing agent selected to be tartrazine, and the balance of said solution is water, wherein all percentages are by weight.
In the method of stabilizing an aqueous bleach solution comprising about 5 to 30% by weight of a persalt selected from the group consisting of sodium perborate sodium percarbonate and, about 2 to 30% by weight of a solubilizing agent and having a pH of about 5-8, the improvement which comprises adding to said solution about 0.001 to 1.0%, by weight, of an azo stabilizing agent selected to be tartrazine.
Dependencies are inferred from the claim text.