Process for Colouring Keratin Fibres
This invention relates to a process for colouring keratin fibres especially human hair. Accordingly, the object of the present invention is a process for colouring keratin fibres, especially human hair, wherein keratin fibres to be coloured is wetted with water before application of a colouring composition comprising at least one direct dyestuff dispersed in a suitable medium for colouring wherein part of direct dyestuff is present in undissolved form.
1 - A process for colouring keratin fibres, especially human hair, comprising wetting keratin fibres with water and applying a colouring composition to said keratin fibres, said colouring composition comprising at least one direct dyestuff dispersed in a suitable medium for colouring wherein part of direct dyestuff is present in undissolved form.
2 - The process according to claim 1 wherein the direct dye is chosen from anionic, cationic and neutral nitro dyestuffs and present at a concentration in the range of 0.01 to 10% by weight calculated to total composition.
3 - The process according to claim 1 comprising at least 10% by weight, calculated to total composition, lipophilic compound and at least 5% by weight, calculated to total composition, water.
4 - The process according to claim 3 wherein the lipophilic compound is a volatile or non-volatile silicone oil.
5 - The process according to claims 3 and 4 characterised in that lipophilic compound is either natural or synthetic natural oil.
6 - The process according to claim 3 wherein the lipophilic compound is a fatty acid alkyl ester according to the formula
R 1 C(O)OR 2
wherein R 1 is a saturated or unsaturated, straight or branched alkyl chain with 7 to 23 C atoms and R 2 is a saturated or unsaturated, straight or branched alkyl chain with 8 to 24 C atoms.
7 - The process according to claim 3 wherein the lipophilic compound is an alkyl carbonate according to general formula
R 2 OC(O)OR 2
wherein R 2 is a saturated or unsaturated, straight or branched alkyl chain with 8 to 24 C atoms.
8 - The process according to claim 1 wherein the at least one direct dye is mixed prior to application onto hair.
9 - The process according to claim 8 wherein the composition comprises at least one oxidizing agent at a concentration of 2 to 12% by weight, calculated to total composition prior to mixing.
10 - The process according to wherein the pH of the composition is between 2 and 12.
11 - The process according to claim 1 wherein the composition further comprises at least one surfactant selected from anionic surfactants, non-ionic surfactants, cationic surfactants and amphoteric surfactants and present at a concentration of 0.05 to 10% by weight calculated to total composition.
12 - The process according to claim 1 wherein the composition further comprises at least one compound according to general formula
wherein n is a number between 1 and 10
13 - The process according to claim 1 wherein the composition further comprises at least one oxidative dye precursor and at least one coupler.
14 - (canceled)
15 - (canceled)
16 - The process according to claim 1 wherein the composition further comprises at least one cationic polymer.
17 - The process according to claim 1 wherein the composition further comprises at least one thickening polymer.
18 - The process according to claim 1 wherein the composition further comprises at least one at least one fatty alcohol with an alkyl chain length of 12 to 22 C atoms.
19 - The process according to claim 1 wherein the composition further comprises at least one organic solvent.