Patent ID: 11918671
Assignee: HENKEL AG & CO. KGAA
Field: Pharmaceuticals (Chemistry)
Classification: CPC A | IPC A

Claim 15:
16. A process for multitonal dyeing of hair, comprising:
(1) preparing an oxidative colorant agent (A) from at least a developer component, a coupler component, and an oxidizing agent;
(2) treating hair with the oxidative colorant agent (A) prepared in (1) to give a colored hair;
(3) preparing a CH-acidic hair dyeing agent (B) having a pH of from about 7 to about 10, measured at 22° C., by mixing together:
(B1) an agent comprising at least one reactive carbonyl compound in a cosmetic carrier, where the agent (B1) is free from CH-acidic compounds,
(B2) an agent comprising at least one CH-acidic compound in a cosmetic carrier, where the agent (B2) is free from reactive carbonyl compounds, and where the at least one CH-acidic compound is selected from compounds of the formula (CH-1) and/or compounds of the formula (CH-2):, wherein R6 represents a substituted or unsubstituted linear or cyclic (C1 to C6)alkyl group, (C2 to C6)alkenyl group, aryl group, heteroaryl group, or aryl(C1 to C6)alkyl group, or a group of the formula RI RII N-(CH2)m-, in which m is an integer of from 2 to 6, and RI and RII are each independently H, a (C1 to C4)alkyl group, a (C1 to C4)hydroxyalkyl group, or an aryl-(C1 to C6)alkyl group, or RI and RII together represent a C3 to C6 alkylene group that together with the nitrogen atom form a 5-, 6-, or 7-membered ring; R7 represents a (C1 to C6)alkyl group; X−is a physiologically compatible anion; Het represents an optionally substituted heteroaromatic group; and X1 represents a covalent bond or a carbonyl group (C═O);and
(B3) an agent comprising at least one alkalizing agent;

(4) treating the colored hair of (2) with the CH-acidic hair dyeing agent (B) prepared in (3) to give a dyed hair; and
(5) treating the dyed hair of (4) with a cosmetic decolorizing agent (Ox) to give a multitonal dyed hair, wherein the cosmetic decolorizing agent (Ox) has a pH value in the range from 4 to 11, measured at 22° C., and comprises water and from about 0.5 to about 12 wt. % hydrogen peroxide, based on the total weight of the decolorizing agent (Ox).