Agent for oxidatively dyeing keratin fibers, containing at least one oxidation dye precursor of the developer type and isatin

1 . A multi-component packaging unit for oxidatively dyeing keratinous fibers, the multi-component packaging unit comprising:

a first container containing a dyeing agent, the dyeing agent comprising:

at least one oxidation dye precursor of the developer type selected from the group consisting of p-toluylene diamine, 2-methoxymethyl-p-phenylene diamine, 2-(2-hydroxy-ethyl)-p-phenylene diamine, N,N-bis-(2-hydroxyethyl)-p-phenylene diamine, p-phenylene diamine, 4-amino-3-methylphenol, p-aminophenol, 4,5-diamino-1-(2-hydroxyethyl) pyrazole, and physiologically tolerated salts thereof,

isatin,

at least one alkalizing agent selected from the group consisting of ammonia, monoethanolamine, 2-amino-2-methylpropanol, arginine, lysine, ornithine, and histidine, and

at least one oxidation dye precursor of the coupler type selected from the group consisting of 3-aminophenol, 5-amino-2-methylphenol, 3-amino-2-chloro-6-methylphenol, 2-hydroxy-4-aminophenoxyethanol, 5-amino-4-chloro-2-methylphenol, 5-(2-hydroxyethyl)amino-2-methylphenol, 2,4-dichloro-3-aminophenol, 2-aminophenol, 3-phenylene diamine, 2-(2,4-diaminophenoxy) ethanol, 1,3-bis(2,4-diaminophenoxy)propane, 1-methoxy-2-amino-4-(2-hydroxyethylamino)benzene, 1,3-bis(2,4-diaminophenyl)propane, 2,6-bis(2′-hydroxyethyl)-1-methylbenzene, 1-amino-3-bis(2-hydroxyethyl)aminobenzene, 2-amino-3-hydroxypyridine, 3-amino-2-methylamino-6-methoxypyridine, 2,6-dihydroxy-3,4-dimethylpyridine, 3,5-diamino-2,6-dimethoxypyridine, 1-phenyl-3-methylpyrazol-5-one, 1-naphthol, 1,5-dihydroxynaphthalene, 2,7-dihydroxynaphthalene, 1,7-dihydroxynaphthalene, 1,8-dihydroxynaphthalene, 4-hydroxyindole, 6-hydroxyindole, 7-hydroxyindole, 4-hydroxyindoline, 6-hydroxyindoline, 7-hydroxyindoline, any physiologically tolerated salt thereof, and any mixture thereof; and

a second container containing an oxidizing agent composition, the oxidizing agent composition comprising:

at least one oxidizing agent from the group consisting of hydrogen peroxide and its addition products to organic or inorganic compounds,

wherein the first container and the second container are packaged separately from one another.

2 . The multi-component packaging unit of claim 1 , wherein the at least one oxidation dye precursor of the developer type is present in an amount, based on the total weight of the dyeing agent, ranging from 0.001 to 10.0 wt %.

3 . The multi-component packaging unit of claim 2 , wherein the at least one oxidation dye precursor of the developer type is present in an amount, based on the total weight of the dyeing agent, ranging from 0.1 to 5.0 wt %.

4 . The multi-component packaging unit of claim 1 , wherein the isatin is present in an amount, based on the total weight of the dyeing agent, ranging from 0.001 to 10 wt %.

5 . The multi-component packaging unit of claim 4 , wherein the isatin is present in an amount, based on the total weight of the dyeing agent, ranging from 0.15 to 2.5 wt %.

6 . The multi-component packaging unit of claim 1 , wherein a weight ratio of the at least one oxidation dye precursor of the developer type to the isatin ranges from 2:1 to 1:2.

7 . The multi-component packaging unit of claim 6 , wherein a weight ratio of the at least one oxidation dye precursor of the developer type to the isatin ranges from 1.8:1 to 1.1:1.

8 . The multi-component packaging unit of claim 1 , wherein the at least one alkalizing agent is selected from the group consisting of ammonia and monoethanolamine.

9 . The multi-component packaging unit of claim 1 , wherein the first container further comprises water, and wherein the dyeing agent has a pH ranging from 6.5 to 11.5.

10 . The multi-component packaging unit of claim 9 , wherein the dyeing agent has a pH ranging from 8.5 to 11.

11 . The multi-component packaging unit of claim 1 , wherein the at least one oxidation dye precursor of the coupler type is present in an amount, based on the total weight of the dyeing agent, ranging from 0.001 to 10 wt %.

12 . The multi-component packaging unit of claim 11 , wherein the at least one oxidation dye precursor of the coupler type is present in an amount, based on the total weight of the dyeing agent, ranging from 0.1 to 3.5 wt %.

13 . The multi-component packaging unit of claim 1 , wherein the dyeing agent further comprises at least one resorcinol-type coupler present in an amount, based on the total weight of the dyeing agent, below 0.1 wt %.

14 . The multi-component packaging unit of claim 1 , wherein the dyeing agent further comprises at least one surfactant selected from the group consisting of anionic surfactants, amphoteric surfactants, zwitterionic surfactants, and non-ionic surfactants.

15 . The multi-component packaging unit of claim 1 , wherein the dyeing agent comprises less than 25 wt % of fatty components, based on the total weight of the dyeing agent.