Hair colouring methods and compositions thereof
View Patent ↗The present invention relates to a method for coloring hair wherein a hair coloring composition is applied to the hair roots. The hair coloring composition is then diluted with a dilutant component and the diluted hair coloring composition is applied to the hair lengths and tips.
1. A method for colouring hair comprising the steps of:
i) mixing a developer component with a dye component to obtain a non-diluted hair colouring composition, wherein the developer component comprises an oxidizing agent and the dye component comprises at least one oxidative dye precursor and/or an alkalising agent;
ii) applying a first portion of the non-diluted hair colouring composition obtained in step i) to the hair and retaining a second portion of the non-diluted hair colouring composition obtained in step i);
iii) mixing the second portion with a dilutant component comprising water and at least one active component selected from surfactants, conditioning agents, polymers and mixture thereof at a mixing ratio of about 4:1 to about 1:2 to obtain a diluted hair colouring composition;
iv) applying the diluted hair colouring composition to the hair;
v) rinsing the hair.
2. The method according to claim 1 , wherein in step ii) the first portion of the non-diluted hair colouring composition is applied to the hair roots and in step iv) the diluted hair colouring composition is applied to the hair lengths and tips.
3. The method according to claim 1 , wherein in step ii) from about 90 to about 10% by weight of the non-diluted hair colouring composition obtained in step i) is applied as a first portion to the hair.
4. The method according to claim 1 , wherein:
the developer component comprises from about 1 to about 20% by weight of the oxidizing agent, and
the dye component comprises from about 0.01% to about 10% by weight of the oxidative dye precursor(s) and/or from about 0.1% to about 10% by weight of the alkalising agent, and
the dilutant component comprises up to about 99% by weight of water and up to about 25% by weight of at least one active component selected from surfactants, conditioning agents, polymers, and mixtures thereof.
5. The method according to claim 1 , wherein the dilutant component comprises less than about 10% by weight of surfactant.
6. The method according to claim 1 , wherein each of the non-diluted hair colouring composition and the diluted hair colouring composition has a viscosity which induces a shear stress of from about 20 to about 200 Pa at 10 s −1 as measured according to the viscosity test method.
7. The method according to claim 1 , wherein the non-diluted hair colouring composition has a viscosity which induces a shear stress of from about 60 to about 200 Pa at 10 s −1 as measured according to the viscosity test method and the diluted hair colouring composition has a viscosity which induces a shear stress of from about 20 to about 180 Pa at 10 s −1 as measured according to the viscosity test method.
8. The method according to claim 1 , wherein the non-diluted hair colouring composition and the diluted hair colouring composition are applied to the hair with a brush and bowl applicator or a container to which a nozzle or a separate applicator device such as a comb or a brush is attached.
9. The method according to claim 1 , wherein the non-diluted hair colouring composition and/or the diluted hair colouring composition comprises at least one gel network thickener system.
10. The method according to claim 1 , wherein the developer component comprises a thickener selected from acrylates copolymer, hydrophobically modified acrylate copolymers and mixtures thereof.
11. The method according to claim 1 , comprising the step of waiting for a time period T 1 which is performed between steps ii) and iii) and/or the step of waiting for a time period T 2 which is performed between steps iv) and v), wherein:
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wherein a and b are respectively the weight of the second portion of the non-diluted hair colouring composition and the weight of the dilutant component which are mixed together in step iii).
12. The method according to claim 1 comprising the step of waiting for a time period of from about 10 min to about 40 min, which is performed between steps ii) and iii) and the step of waiting for a time period of from about 5 min to about 20 min, which is performed between steps iv) and v).
13. The method according to claim 1 , wherein step iii) is performed immediately after step ii) and wherein the method further comprises the step of waiting for a time period of from about 5 to about 40 min which is performed between steps iv) and v).
14. A hair colouring kit comprising a developer component comprising an oxidizing agent, a dye component comprising at least one oxidative dye precursor and/or an alkalising agent and a dilutant component comprising water and optionally at least one active component as defined in claim 1 .
15. The hair colouring kit according to claim 14 , wherein the kit further comprises a brush and bowl applicator.
16. The hair colouring kit according to claim 14 , wherein the kit further comprises a shampoo for use in rinsing the hair after colouring and/or a conditioner component.
17. The hair colouring kit according to claim 14 , wherein the kit further comprises a set of instructions comprising instructing the user to colour its hair.
18. A hair colouring composition comprising:
a developer component comprising an oxidizing agent, and
a dye component comprising at least one oxidative dye precursor and/or an alkalising agent, and a dilutant component comprising water and at least one active component selected from surfactants, conditioning agents, polymers and mixture thereof, wherein the hair colouring composition is obtainable by:
i) mixing the developer component and the dye component, wherein after mixing the developer component and the dye component, a first portion of the composition is applied to the hair and a second portion of the composition is retained, and
ii) mixing the second portion of the composition with the dilutant component at a mixing ratio of about 4:1 to about 1:2.
19. The hair colouring composition according to claim 18 , wherein in step i) the first portion of the composition is applied to the hair roots.