Hair colorants for simultaneous dyeing and brightening of keratin fibers

1. An agent for the simultaneous brightening and coloring of keratin fibers, wherein the agent contains an oxidant and at least one thiazolium dye of formula (I) and has a basic pH

wherein

R1 stands for a saturated or unsaturated (C1-C12)-alkyl group, a halogen atom-substituted (C1-C12)-alkyl group, a hydroxy-(C1-C12)-alkyl group, a (C1-C6)-alkoxy-(C1-C12)-alkyl group, an amino-(C1-C12)-alkyl group, a (C1-C6)-alkylamino-(C1-C12)-alkyl group, a di(C1-C6)-alkylamino-(C1-C12)-alkyl group, a cyano-(C1-C12)-alkyl group, a substituted or unsubstituted phenyl group or a substituted or unsubstituted benzyl group;

R2 and R3 can be equal or different and independently of each other stand for hydrogen, a halogen atom, a saturated or unsaturated (C1-C12)-alkyl group, a (C1-C12)-alkoxy group, a nitro group, an amino group, a (C1-C12)-alkylamino group, a di(C1-C12)-alkylamino group, a (C1-C12)-hydroxyalkylamino group, a di(C1-C12)-hydroxyalkylamino group, a substituted or unsubstituted phenyl group or a substituted or unsubstituted heteroaryl group;

R4 stands for hydrogen, a saturated or unsaturated (C1-C12)-alkyl group, a halogen atom-substituted (C1-C12)-alkyl group, a hydroxy-(C1-C12)-alkyl group, an amino-(C1-C12)-alkyl group or a benzyl group;

R5 and R6 can be equal or different and independently of each other stand for hydrogen, a halogen atom, a saturated or unsaturated (C1-C12)-alkyl group, a hydroxyl group, a (C1-C12)-alkoxy group, a cyano group, a nitro group, an amino group, a (C1-C12)-alkylamino group or a di(C1-C12)-alkylamino group and

A − stands for an anion of an organic or inorganic acid.

2. The agent as defined in claim 1 , wherein R1 stands for a saturated or unsaturated (C1-C12)-alkyl group.

3. The agent as defined in claim 2 , wherein R4 stands for a saturated or unsaturated (C1-C12)-alkyl group.

4. The agent as defined in claim 1 , wherein A − stands for a chloride, bromide, iodide, hydrogen sulfate, sulfate, toluenesulfonate, benzenesulfonate, monomethylsulfate, hexafluorophosphate, hexafluoroantimonate, tetrafluoroborate, tetraphenylborate, formate, acetate or propionate anion.

5. The agent as defined in claim 1 , wherein the compound of formula (I) is selected from the group consisting of:

3-methyl-2-[[4-[4-methyl(phenylmethyl)amino]-phenyl]-azo]thiazolium chloride; 3-methyl-2-[[4-[methyl(phenylmethyl)amino]phenyl]azo]thiazolium bromide; 3-methyl-2-[[4-[methyl(phenylmethyl)amino]phenyl]azo]thiazolium monomethyl-sulfate; 3-methyl-2-[[4-[methyl(phenylmethyl)amino]phenyl]azo]thiazolium acetate; 3,4-di-methyl-2-[[4-[methyl(phenylmethyl)amino]phenyl]azo]thiazolium chloride; 3,4-dimethyl-2-[[4-[methyl(phenylmethyl)amino]phenyl]azo]thiazolium bromide; 3,4-dimethyl-2-[[4-[methyl(phenylmethyl)amino]phenyl]azo]thiazolium monomethylsulfate; 3,4-dimethyl-2-[[4-[methyl(phenylmethyl)amino]phenyl]azo]thiazolium acetate; 3,5-dimethyl-2-[[4-[methyl(phenylmethyl)amino]phenyl]azo]thiazolium chloride; 3,5-dimethyl-2-[[4-[methyl(phenylmethyl)amino]phenyl]azo]thiazolium bromide; 3,5-dimethyl-2-[[4-[methyl(phenylmethyl)amino]phenyl]azo]thiazolium monomethylsulfate; 3,5-dimethyl-2-[[4-[methyl(phenylmethyl)amino]phenyl]azo]thiazolium acetate; 3,4,5-trimethyl-2-[[4-[methyl(phenylmethyl)amino]phenyl]azo]thiazolium chloride; 3,4,5-trimethyl-2-[[-4-[methyl(phenylmethyl)amino]phenyl]azo]thiazolium bromide; 3,4,5-trimethyl-2-[[4-[methyl(phenylmethyl)amino]phenyl]azo]thiazolium monomethylsulfate; 3,4,5-trimethyl-2-[[4-[methyl(phenylmethyl)amino]phenyl]thiazolium acetate; 2-[[4-[ethyl(phenylmethyl)amino]-2-methylphenyl]azo]-3-methylthiazolium chloride; 2-[[4-[ethyl(phenylmethyl)amino]-2-methylphenyl]azo]-3-methylthiazolium bromide; 2-[[4-[methyl(phenylmethyl)amino]-2-methylphenyl]azo]-3-methylthiazolium monomethylsulfate; 2-[[4-[ethyl(phenylmethyl)amino]-2-methylphenyl]azo]-3-methylthiazolium acetate; 2-[[4-[ethyl(phenylmethyl)amino]-2-methylphenyl]azo]-3,4-dimethylthiazolium chloride; 2-[[4-[ethyl(phenylmethyl)amino]-2-methylphenyl]azo]-3,4-dimethylthiazolium bromide; 2-[[4-[ethyl(phenylmethyl)amino]-2-methylphenyl]azo]-3,4-dimethylthiazolium monomethylsulfate; 2-[[4-[ethyl(phenylmethyl)amino]-2-methylphenyl]azo]-3,4-dimethylthiazolium acetate; 2-[[4-[ethyl(phenylmethyl)amino]-2-methylphenyl]azo]-3,5-dimethylthiazolium chloride; 2-[[4-[ethyl(phenylmethyl)amino]-2-methylphenyl]azo]-3,5-dimethylthiazolium bromide; 2-[[4-[ethyl(phenylmethyl)amino]-2-methylphenyl]azo]-3,5-dimethylthiazolium monomethylsulfate; 2-[[-4-[ethyl(phenylmethyl)amino]-2-methylphenyl]azo]-3,5-dimethylthiazolium acetate; 2-[[4-[ethyl(phenylmethyl)amino]-2-methylphenyl]azo]-3,4,5-trimethylthiazolium chloride; 2-[[4-[ethyl(phenylmethyl)amino]-2-methylphenyl]azo]-3,4,5-trimethylthiazolium bromide; 2-[[4-[ethyl(phenylmethyl)amino]-2-methylphenyl]azo]-3,4,5-trimethylthiazolium monomethylsulfate; and 2-[[4-[ethyl(phenylmethyl)amino]-2-methylphenyl]azo]-3,4,5-trimethylthiazolium acetate.

6. The agent as defined in claim 1 , wherein the agent contains the compound of formula (I) in an amount from 0.01 to 10 weight percent.

7. The agent as defined in claim 1 , wherein the agent additionally contains at least one other oxidation-resistant direct dye and/or oxidation dye precursor.

8. The agent as defined in claim 1 , wherein the agent is a ready-to-use colorant and has a pH of 8 to 11.

9. The agent as defined in claim 1 , wherein the oxidant is selected from among hydrogen peroxide and the compounds of addition thereof to urea, melamine, sodium borate or sodium carbonate.

10. The agent as defined in claim 1 , wherein the agent additionally contains a persulfate.

11. The agent as defined in claim 1 , wherein the agent is in the form of a 2-component agent consisting of a dye carrier composition (A) containing at least one thiazolium dye of formula (I) and a component (B) containing an oxidant.

12. The agent as defined in claim 1 , wherein the agent is a hair colorant.