Stabilized liquid persalt bleach compositions
AssigneeUnited States Borax & Chemical Corporation
InventorWilliam G. Woods
Life of this patent
Estimating the term…
Abstract
Stable, concentrated aqueous persalt solutions are provided in which the stabilizing agent is an arylazo compound having an ortho-hydroxy substituent on the aryl group. Preferred compositions contain sodium perborate and a solubilizing agent as well as the azo stabilizer.
Claims16
A stable, concentrated aqueous persalt laundry bleach solution having a pH of about 5 to 8 comprising about 5 to 30% of sodium perborate or sodium percarbonate, about 3 to 30% solubilizing agent, about 0.001 to 1.0% of an azo stabilizing agent selected from the formulas consisting of:
- ##STR3## where R is selected from the group consisting of unsubstituted and substituted phenyl, unsubstituted and substituted naphthyl, unsubstituted and substituted unsaturated heterocyclic compounds containing carbon and nitrogen, wherein when substituted the substituted moiety is selected from the group consisting of at least one of amino, lower alkyl, hydroxy, and alkali metal sulfonate;
- R' is selected from the group consisting of nitro, amino, lower alkoxy, hydroxy, lower alkyl, halo, sufonic acid, phenylazo, carboxylic acid, ureamido, sulfamido, acetamido, acyl, alkylene and heterocylic linkages, and the salts thereof;
- x is 0 to about 5, and the balance of said solution is water, wherein all percentages are by weight.
In a concentrated aqueous solution of 5 to 30% sodium perborate containing a solubilizing agent and having a pH of about 5 to 8, the improvement which comprises including a stabilizing amount about 0.001 to 1.0% of an aromatic azo compound selected from the formulas consisting of:
- ##STR4## where R is selected from the group consisting of unsubstituted and substituted phenyl, unsubstituted and substituted naphthyl, unsubstituted and substituted unsaturated herterocyclic compounds containing carbon and nitrogen, wherein when substituted the substituted moiety is selected from the group consisting of at least one of amino, lower alkyl, hydroxy, and alkali metal sulfonate;
- R' is selected from the group consisting of nitro, amino, lower alkoxy, hydroxy, lower alkyl, halo, sufonic acid, phenylazo, carboxylic acid, ureamido, sulfamido, acetamido, acyl, alkylene and heterocylic linkages, and the salts thereof;
- x is 0 to about 5, and wherein all percentages are by weight.
In a method of stabilizing an aqueous 5 to 30% persalt laundry bleach solution having a pH of about 5 to 8, the improvement which comprises adding to said solution about 0.001 to 1.0% of a stabilizing agent selected from the formulas consisting of:
- ##STR5## where R is selected from the group consisting of unsubstituted and substituted phenyl, unsubstituted and substituted naphthyl, unsubstituted and substituted unsaturated heterocyclic compounds containing carbon and nitrogen, wherein when substituted the substituted moiety is selected from the group consisting of at least one of amino, lower alkyl, hydroxy, and alkali metal sulfonate;
- R' is selected from the group consisting of nitro, amino, lower alkoxy, hydroxy, lower alkyl, halo, sulfonic acid, phenylazo, carboxylic acid, ureamido, sulfamido, acetamido, acyl, alkylene and heterocylic linkages, and the salts thereof;
- x is 0 to about 5, and wherein all percentages are by weight.
Dependencies are inferred from the claim text.