Use of alkanolamines for thickening oxidative colouring emulsion
The present invention relates to the use of alkanolamines for thickening oxidative coloring compositions. More particularly, the present invention relates to the use of alkanolamines for thickening ready to use oxidative coloring composition based on mixing two compositions wherein one comprises at least one oxidative dyeing precursor and the other comprises as least one oxidizing agent.
1. A method for thickening oxidative hair coloring compositions comprising adding at least one compound according to the general formula
R 1 R 2 R 3 N
wherein R 1 , R 2 and R 3 are same or different H, C 1 -C 6 alkyl, C 1 -C 6 monohydroxyalkyl or C 2 -C 6 polyhydroxyalkyl with the condition that at least one of R 1 , R 2 and R 3 is a mono or polyhydroxyalkyl, to a hair coloring composition, said coloring composition being a mixture of a first composition comprising an oxidative dye precursor and a second composition comprising at least one oxidizing agent, wherein the coloring composition is an emulsion.
2. The method according to claim 1 wherein R 1 , R 2 and R 3 are same or different H, C 1 -C 4 alkyl, C 1 -C 4 monohydroxyalkyl or C 2 -C 4 polyhydroxyalkyl with the condition that at least one of R 1 , R 2 and R 3 is a mono or polyhydroxyalkyl.
3. The method according to claim 1 compound according to the general formula R 1 R 2 R 3 N is an alkanolamine.
4. The method according to claim 3 wherein the alkanolamine is selected from monoethanolamine, diethanolamine and triethanolamine.
5. The method according to claim 4 wherein the alkanolamine is monoethanolamine.
6. The method according to claim 1 wherein the concentration of alkanolamine in the coloring composition is between about 1 to 35 wt. %.
7. The method according to claim 6 wherein the concentration of alkanolamine in the coloring composition is between about 2.5 to 20 wt. %.
8. The method according to claim 1 wherein the viscosity of the coloring composition is greater than 935 mPa·s.
9. The method according to claim 8 wherein the viscosity of the coloring composition is 1250 mPa·s or greater.
10. The method according to claim 1 wherein the coloring composition comprises at least one emulsifier selected from the group consisting of anionic, non-ionic, cationic, amphoteric surfactants and mixtures thereof.
11. The method according to claim 10 wherein the coloring composition comprises a mixture of anionic and non-ionic surfactants in a mixing ratio in the range of between 3:1 to 1:3.
12. The method according to claim 10 wherein the coloring composition comprises a mixture of cationic and non-ionic surfactants in a mixing ratio in the range of between 3:1 to 1:3.