Method of stabilizing hydrogen peroxide or hydrogen peroxide donor substances with hydroxypyridones or salts therof
A description is given of the use of hydroxypyridones or the salts thereof for stabilizing hydrogen peroxide or hydrogen peroxide donor substances. The stabilization takes place preferably in aqueous compositions.
1. A method for stabilizing at least one substance selected from the group consisting of hydrogen peroxide and hydrogen peroxide donor substances (component a)) comprising the step of adding at least one substance selected from the group consisting of hydroxypyridones and salts thereof (component d)) to an aqueous composition.
2. The method as claimed in claim 1 , wherein the at least one substance of component a) is selected from the group consisting of hydrogen peroxide, urea peroxide, perborates, persulfates and mixtures thereof.
3. The method as claimed in claim 1 , wherein the at least one substance of component a) is hydrogen peroxide.
4. The method as claimed in claim 1 , wherein the at least one substance of component d) is selected from compounds of the formula (I) and salts thereof
in which R1 is H or a C 1 -C 4 -alkyl radical and R2 is H, an unsubstituted or halogen-substituted, branched or unbranched C 1 -C 20 -alkyl radical, an unsubstituted or halogen-substituted C 5 -C 8 -cycloalkyl radical, an unsubstituted or halogen-substituted C 6 -C 10 -aryl radical or an unsubstituted or halogen-substituted, branched or unbranched C 7 -C 20 -aralkyl radical.
5. The method as claimed in claim 1 , wherein the at least one compound of component d) is present in the form of the acid or in the form of the alkali metal, alkaline earth metal or amine salts or in the form of the salts with polymeric counterions.
6. The method as claimed in claim 4 , wherein, in the at least one compound of the formula (I) or in the salts, R1 is methyl and R2 is cyclohexyl or 2,4,4-trim ethyl pentyl.
7. The method as claimed in claim 1 , wherein the substance of component a) is hydrogen peroxide and the hydrogen peroxide is present in an amount of from 0.5 to 20% by weight in the aqueous composition, based on the total weight of the aqueous composition.
8. The method as claimed in claim 1 , wherein the at least one substance of component d) is present in an amount of from 0.1 ppm to 2% by weight in the aqueous composition, based on the total weight of the aqueous composition.
9. The method as claimed in claim 8 , wherein the at least one substance of component d) is present in an amount of from 0.5 to 100 ppm in the aqueous composition, based on the total weight of the aqueous composition.
10. The method as claimed in claim 1 , wherein the aqueous composition has a pH of from 2 to 11.
11. The method as claimed in claim 10 , wherein the aqueous composition has a pH of from 7 to 11.