Two coat process for dyeing keratin fibres

Abstract

The present invention relates to a process for dyeing keratin fibres, in particular the hair, which consists in applying to the keratin fibres: at least one coat of at least a first composition (i) comprising at least one hydrophobic film-forming polymer, at least one volatile solvent and at least one pigment, and then, after drying, at least a second coat of at least a second composition (ii) comprising at least one hydrophobic film-forming polymer, at least one volatile solvent and at least one pigment, the pigments of compositions (i) and (ii) being qualitatively and/or quantitatively different.

Claims

1. A process for dyeing keratin fibers comprising: (1) (a) applying to untreated keratin fibers a first composition (i) comprising: from 1% to 20% of a mixture of at least two hydrophobic film-forming polymers comprising at least one first hydrophobic film-forming polymer chosen from hybrid acrylic hydrophobic polymers and at least one second hydrophobic film-forming polymer chosen from silicone copolymers obtained by reaction of a silicone resin and of a fluid silicone or linear block silicone copolymers, at least one volatile solvent chosen from water, non-silicone organic solvents, or mixtures thereof, and from 0.1% to 15% of at least one first pigment chosen from mineral pigments, organic pigments, lakes, special-effect pigments, or mixtures thereof, thereby obtaining keratin fibers having a first coat formed by the first composition (i); wherein all amounts are by weight, relative to the total weight of the first composition (i); and (b) drying the first coat; and (2) applying a second composition (ii) to the keratin fibers having the first coat after the first coat is dried, thereby obtaining keratin fibers having a second coat formed by the second composition (ii) on the first coat, the second composition (ii) comprising: from 1% to 20% of a mixture of at least two hydrophobic film-forming polymers comprising at least one first hydrophobic film-forming polymer chosen from hybrid acrylic hydrophobic polymers and at least one second hydrophobic film-forming polymer chosen from silicone copolymers obtained by reaction of a silicone resin and of a fluid silicone or linear block silicone copolymers, at least one volatile solvent chosen from water, non-silicone organic solvents, or mixtures thereof, and from 0.1% to 15% of at least one second pigment chosen from mineral pigments, organic pigments, lakes, special-effect pigments, or mixtures thereof; wherein all amounts are by weight, relative to the total weight of the second composition (ii); wherein the at least one first pigment contained in the first composition (i) and the at least one second pigment contained in the second composition (ii) are qualitatively and/or quantitatively different; and wherein the first composition (i) produces a coloration such that a color variation ΔE1, expressed in the CIE L* a* b* system, between the keratin fibers having the first coat and the untreated keratin fibers is at least 2, and the second composition (ii) produces a coloration such that a color variation ΔE2, expressed in the CIE L* a* b* system, between the keratin fibers having the second coat and the keratin fibers having the first coat is at least 2.

2. The process according to claim 1, wherein the hybrid acrylic hydrophobic polymers in the first composition (i), the second composition (ii), or both, are independently chosen from hybrid acrylic polymers synthesized from (I) at least one monomer bearing at least one (meth)acrylic acid group, and esters and/or amides of these acid monomers, and (II) at least one styrene compound.

3. The process according to claim 1, wherein the linear block silicone copolymers in the first composition (i), the second composition (ii), or both, are in the form of particles in dispersion in an aqueous medium.

4. The process according to claim 3, wherein the linear block silicone copolymers in the first composition (i), the second composition (ii), or both, are independently obtained by a chain extension reaction, in the presence of a catalyst, of: (a) at least one polysiloxane (i) having at least one reactive group per molecule; and (b) at least one organosilicone compound (ii) which reacts with the polysiloxane (i) by a chain extension reaction.

5. The process according to claim 4, wherein the polysiloxane (i) is chosen from compounds of formula (I): ##STR00007## wherein: R.sub.1 and R.sub.2 are independently chosen from a hydrocarbon-based group containing from 1 to 20 carbon atoms, an aryl group, or a reactive group, n is equal to an integer greater than 1, with the proviso that there are at least one and no more than two reactive groups per polymer, and the reactive groups are independently chosen from hydrogen; aliphatically unsaturated groups; hydroxyl groups; alkoxy groups; alkoxyalkoxy groups; acetoxy groups; amine groups; or mixtures thereof.

6. The process according to claim 5, wherein R.sub.1 represents a methyl group and the R.sub.2 at one or both end of the chain represents a vinyl group.

7. The process according to claim 5, wherein the at least one organosilicon compound (ii) is chosen from polysiloxanes of formula (I) or compounds acting as chain extenders.

8. The process according to claim 7, wherein the at least one organosilicon compound (ii) is a liquid organohydrogenopolysiloxane of formula (II): ##STR00008## wherein n is an integer greater than 1.

9. The process according to claim 3, wherein the dispersion is an aqueous dispersion of divinyl dimethicone/dimethicone copolymer.

10. The process according to claim 1, wherein the first composition (i), the second composition (ii), or both, independently comprise hydrophobic film-forming polymers chosen from copolymers of (meth)acrylic acid ester(s) and styrene, divinyl dimethicone/dimethicone copolymer, or mixtures thereof.

11. The process according to claim 1, wherein the at least one volatile solvent in the first composition (i), the second composition (ii), or both, is independently chosen from water, ethanol, isopropanol, acetone, isododecane, decamethylcyclopentasiloxane, octamethyltrisiloxane, decamethyltetrasiloxane, or mixtures thereof.

12. The process according to claim 1, wherein the first composition (i), the second composition (ii), or both, comprise at least one thickener.

13. The process according to claim 12, wherein the at least one thickener in the first composition (i), the second composition (ii), or both, is independently chosen from clays.

14. The process according to claim 1, wherein the first composition (i), the second composition (ii), or both, comprise one or more surface-treated pigments.

15. The process according to claim 1, wherein a coloration produced by the first composition (i) when applied to untreated keratin fibers is different from a coloration produced by the second composition (ii) when applied to the keratin fibers having the first coat.

Description

EXAMPLES

Example 1

Application to Dark Hair

(1) TABLE-US-00001 Composition A BioPSA DC 7-4405 at 40% in isododecane, sold by 17.5 g Dow Corning α,ω-Dihydroxylated PDMS gum of high molecular 1.5 g weight (Xiameter PMX-1502 Fluid from Dow Corning) Mica nacre coated with brown iron oxide, sold by Eckart 6 g under the name Prestige Soft Bronze Isododecane qs 100 g

(2) TABLE-US-00002 Composition B BioPSA DC 7-4405 at 40% in isododecane, sold by 17.5 g Dow Corning α,ω-Dihydroxylated PDMS gum of high molecular 1.5 g weight (Xiameter PMX-1502 Fluid from Dow Corning) Silica-brown iron oxide nacre sold by Merck under the 10 g name Prestige Xirona Red Isododecane qs 100 g

(3) The following tests are then performed on locks of dark hair with a tone depth of 2: on a first lock of dark hair, a coat of composition A is applied by finger or with an applicator, on a second lock of dark hair, a coat of composition B is applied, on a third lock of dark hair, a coat of composition A is applied and is left to dry in the open air until fully dry, followed by a coat of composition B,
each lock is then dried with a hairdryer at a temperature of 80° C. for 2 minutes.

(4) The colorimetric parameters of the various locks are measured and the ΔE is calculated according to the method indicated in the description.

(5) The following results are obtained:

(6) TABLE-US-00003 L* a* b* ΔE1 ΔE2 Colour Untreated lock 17.86 1.44 1.04 15.03 — 1.78 Brown (tone depth 2) Lock dyed with 29.52 5.86 9.44 7.29 11.1 Chestnut composition A brown Lock dyed with 29.37 13.03 10.78 16.91 Orange A and then with B Lock dyed with 23.05 14.29 6.02 — 15.51 Red composition B

(7) Treatment of the hair with composition A leads to an optical lightening effect. The application of composition B onto composition A then makes it possible to obtain the desired shade.

(8) A colour that withstands water, styling and touching and that is shampoo-fast is finally obtained on the lock dyed with compositions A and B.

Example 2

Application to Light-Coloured Hair

(9) TABLE-US-00004 Composition C Styrene/acrylates copolymer in aqueous dispersion, sold 21.2 g, i.e. by BASF under the name Joncryl 77 10 g as AM Divinyl dimethicone/dimethicone copolymer in aqueous 8.3 g, i.e. 5 g emulsion, sold by Dow Corning under the reference as AM HMW 2220 Nonionic Emulsion Clay (Magnesium Aluminium Silicate), sold by 2 g Vanderbilt under the name Veegum granules Black 2 as an aqueous dispersion, from Daito Kasei 10 g, i.e. Kogyo under the name WD-CB2 2.5 g as AM Water qs 100 g

(10) TABLE-US-00005 Composition D Styrene/acrylates copolymer in aqueous dispersion, sold 21.2 g, i.e. by BASF under the name Joncryl 77 10 g as AM Divinyl dimethicone/dimethicone copolymer in aqueous 8.3 g, i.e. emulsion, sold by Dow Corning under the reference 5 g as AM HMW 2220 Nonionic Emulsion Clay (Magnesium Aluminium Silicate), sold by Vanderbilt 2 g under the name Veegum granules Mica nacre coated with brown iron oxide, sold by Eckart 6 g under the name Prestige Soft Bronze Water qs 100 g

(11) The following tests are then performed on locks of light hair with a tone depth of 8: on a first lock of light hair, a coat of composition C, which may be dried with a hairdryer at a temperature of 80° C. or left to dry in the open air, is applied by finger or with an applicator, on a second lock of light hair, a coat of composition D, which may be dried with a hairdryer at a temperature of 80° C. or left to dry in the open air, is applied, on a third lock of light hair, a coat of composition C is applied, and is left to dry in the open air or may be dried at a temperature of 80° C., followed by a coat of composition D, which is dried in the open air or at a temperature of 80° C.

(12) The colorimetric parameters of the various locks are then measured and the ΔE is calculated according to the method indicated in the description.

(13) The following results are obtained:

(14) TABLE-US-00006 L* a* b* ΔE1 ΔE2 C* Colour Untreated lock 43.88 3.74 15.3 30.7 15.75 Blonde (tone depth 8) Lock dyed with 16.69 0.45 1.39 14.16 1.47 Black composition C Lock dyed with 28.13 4.43 8.73 9.79 Chestnut C and then brown with D Lock dyed with 43.03 13.85 20.26 — 24.54 Orange/hazel composition D

(15) The application of composition C leads to optical darkening of the lock of hair with a tone depth of 8. The application of composition D onto composition C then makes it possible to obtain the desired shade.

(16) A colour that withstands water, styling and touching and that is shampoo-fast is finally obtained on the lock dyed with compositions C and D.