Hair compositions comprising at least one disulfide direct dye and at least one alkaline hydroxide agent and simultaneous hair shaping an dyeing processes

• US 20090126755A1
• Filed: 07/24/2008
• Published: 05/21/2009
• Est. Priority Date: 07/24/2007
• Status: Active Grant

• Current Assignee: L'Oreal SA
• Original Assignee: L'Oreal SA
• Inventors: De Boni, Maxime, Guerin, Frederic
• Granted Patent: US 8,097,044 B2
• Time in Patent Office: Days
• US Class Current: 132/208
• CPC Class Codes: A61K 8/466 containing sulfonic acid derivatives; Salts
• CPC Class Codes: A61K 8/4926 having six membered rings
• CPC Class Codes: A61K 8/494 with more than one nitrogen as the only hetero atom
• CPC Class Codes: A61K 8/4966 Triazines or their condensed derivatives
• CPC Class Codes: A61Q 5/065 Preparations for temporary colouring the hair, e.g. direct dyes

Abstract

Disclosed herein are compositions for simultaneous shaping, dyeing, and/or lightening of keratin fibers comprising at least one disulfide direct dye and at least one organic or mineral hydroxide alkaline agent. Also disclosed herein are processes for simultaneous shaping, dyeing, and/or lightening of keratin fibers using said compositions and compartmentalized devices comprising said compositions. The compositions disclosed herein may make it possible to obtain a long-lasting dyeing effect, while limiting the degradation of the keratin fibers.

Claims

1. A composition for treating keratin fibers comprising, in a cosmetically acceptable medium:

at least one disulfide direct dye; and

at least one alkaline agent chosen from mineral and organic hydroxides and present in the composition in an amount such that the pH of the composition ranges from 10 to 14.

2. The composition according to claim 1, wherein the at least one disulfide direct dye is chosen from compounds of Formulae (I), (II), or (III):

and their salts, optical isomers, geometrical isomers, and solvates,

wherein;

A and A′

are, independently of one another, chosen from radicals comprising at least one cationic or non-cationic chromophore;

V and V′

are, independently of one another, chosen from bridging groups;

v and v are, independently of one another, chosen from 0 and 1;

X and X′

are, independently of one another, chosen from;

1) saturated and unsaturated, linear and branched C₁-C₃₀ hydrocarbon chains optionally interrupted and optionally terminated at one or both ends by one or more divalent groups or combinations thereof, chosen from;

—

N(R)—

, —

N⁺(R)(R)—

, —

O—

, —

S—

, —

CO—

, and —

SO₂—

wherein R and R′

are, independently of one another, chosen from hydrogen atoms and C₁-C₄ alkyl, hydroxyalkyl and aminoalkyl radicals;

substituted and unsubstituted, saturated and unsaturated, fused and non-fused, aromatic and non-aromatic (hetero)cyclic radicals optionally comprising at least one heteroatom;

2) a sequence -(T)_t-(Y)_y-(Z)_z-, said sequence being present in Formulae (I), (II), or (III) as follows;

A-(T)_t-(Y)_y-(Z)_z-C_sat or C′

_sat-(T)_t-(Y)_y-(Z)_z-A′

, wherein;

i) T is chosen from —

SO₂—

, —

O—

, —

S—

, —

N(R)—

, —

N⁺(R)(R′

)—

, and —

CO—

radicals, and combinations thereof, wherein R and R′

are, independently of one another, chosen from hydrogen atoms, C₁-C₄ alkyl radicals, and C₁-C₄ hydroxyalkyl radicals; and

the coefficient t is chosen from 0 and 1;

ii) Y is chosen from;

radicals chosen from —

(CH₂)—

SO₂—

, —

CO—

, —

(CH₂)₂—

SO₂—

, and —

CH₂—

CHR—

CO—

NR′

—

radicals, wherein R and R′

are, independently of one another, chosen from hydrogen atoms and C₁-C₄ alkyl radicals;

groups of formula (a), (a′

), or (a″

);

wherein;

B is chosen from —

N— and

—

CR_a—

radicals, wherein R_a is chosen from

hydrogen atoms,

halogen atoms chosen from chlorine and fluorine,

nitro groups,

optionally substituted pyridinium groups;

hydroxyl groups;

amino, alkylamino and dialkylamino groups, wherein the alkyl radicals are chosen from linear and branched C₁-C₁₈ alkyl radicals, optionally interrupted by a heteroatom chosen from N and O, and optionally substituted with at least one hydroxyl group;

—

NHNHCOR radicals wherein R is chosen from linear and branched C₁-C₁₀ alkyl radicals;

 

R′

has the same definition as above;

 

R′

_a is chosen from;

 

hydrogen atoms;

 

halogen atoms chosen from chlorine and fluorine;

 

pyridinium groups, optionally substituted with at least one group R_c chosen from C₁-C₄ alkyl radicals, halogen atoms, carboxyl groups —

COOM (wherein M is chosen from hydrogen atoms, alkali metal atoms, ammonium groups, and ammonium groups substituted with at least one group chosen from linear and branched C₁-C₁₈ alkyl radicals, optionally bearing at least one hydroxyls), ester groups —

COOR_d wherein R_d is chosen from C₁-C₄ alkyl radicals;

amide groups —

CON(R_d)₂ wherein the R_d groups are, independently of one another, chosen from hydrogen atoms and C₁-C₄ alkyl radicals;

 

hydroxyl groups;

 

amino, alkylamino, and dialkylamino groups, wherein the alkyl radicals are chosen from linear and branched C₁-C₁₈ alkyl groups, optionally interrupted by a heteroatom chosen from N and O, and optionally substituted with at least one hydroxyl group;

 

—

NHNHCOR radicals wherein R is chosen from linear and branched C₁-C₁₀ alkyl groups;

 

groups of formula (b);

wherein;

R′

has the same definition as above;

R_b is chosen from;

 

chlorine atoms,

 

amino, alkylamino, and dialkylamino groups, wherein the alkyl radicals are chosen from linear and branched C₁-C₁₈ alkyl groups, optionally interrupted by a heteroatom chosen from N, O, and S, and optionally substituted with at least one hydroxyl,

 

saturated and unsaturated heterocycles comprising at least one nitrogen atom and optionally substituted, and

 

arylamino groups;

and y is chosen from 0 and 1;

iii) Z is chosen from;

—

(CH₂)_m—

radicals wherein m is an integer ranging from 1 to 8

—

(CH₂CH₂O)_q— and

—

(OCH₂CH₂)_q—

radicals wherein q is an integer ranging from 1 to 15,

aryl, alkylaryl, and arylalkyl radicals wherein the alkyl radicals are chosen from C₁-C₄ alkyl radicals and the aryl radicals are optionally substituted with at least one group —

SO₃M wherein M is chosen from hydrogen atoms, alkali metal atoms, and ammonium groups optionally substituted with at least one linear or branched C₁-C₁₈ alkyl radical optionally bearing at least one hydroxyl; and

z is chosen from 0 and 1;

p and p′

are, independently of one another, chosen from 0 and 1;

C_sat and C′

_sat are, independently of one another, chosen from optionally substituted cyclic, linear, and branched C₁-C₁₈ alkylene chains; and

D is chosen from hydroxyl, hydroxyalkyl, alkoxy, carboxyl, carboxylate, amino, alkylamino, and dialkylamino radicals.

3. The composition according to claim 2, wherein, in Formulae (I), (II), or (III), when p is equal to 1, X represents the sequence -(T)_t-(Y)_y-(Z)_z-, and when p′

is equal to 1, X′

represents the sequence -(T)_t-(Y)_y-(Z)_z-, said sequence being present in Formulae (I), (II) or (III) as follows;

A-(T)_t-(Y)_y-(Z)_z-C_sat or C′

_sat-(T)_t-(Y)_y-(Z)_z-A′

, wherein;

i) T is chosen from —

SO₂—

, —

O—

, —

S—

, —

N(R)—

, —

N⁺(R)(R′

), and —

CO—

, and combinations thereof, wherein R and R″

are, independently of one another, chosen from hydrogen atoms, C₁-C₄ alkyl radicals, and C₁-C₄ hydroxyalkyl radicals; and

the coefficient t is chosen from 0 and 1;

ii) Y is chosen from;

radicals chosen from —

(CH₂)₂—

SO₂— and

—

CH₂—

CHR—

CO—

NR′

—

radicals wherein R and R″

are, independently of one another, chosen from hydrogen atoms and C₁-C₄ alkyl radicals;

groups of formula (a), (a′

), or (a″

);

wherein;

B is chosen from —

N— and

—

CR_a—

radicals, wherein R_a is chosen from;

hydrogen atoms,

halogen atoms chosen from chlorine or fluorine,

nitro groups,

optionally substituted pyridinium groups;

hydroxyl groups;

amino, alkylamino, and dialkylamino groups, wherein the alkyl radicals are chosen from linear and branched C₁-C₁₈ alkyl radicals, optionally interrupted by a heteroatom chosen from N and O, and optionally substituted with at least one hydroxyl groups;

—

NHNHCOR radicals wherein R is chosen from linear and branched C₁-C₁₀ alkyl radicals;

R′

has the same definition as above;

R′

_a is chosen from;

hydrogen atoms;

halogen atoms chosen from chlorine and fluorine;

pyridinium groups, optionally substituted with at least one group R_c chosen from C₁-C₄ alkyl radicals, halogen atoms, carboxyl groups —

COOM (wherein M is chosen from hydrogen atoms, alkali metal atoms, ammonium groups, and ammonium groups substituted with at least one group chosen from linear and branched C₁-C₁₈ alkyl radicals, optionally bearing at least one hydroxyl);

ester groups —

COOR_d wherein R_d is chosen from C₁-C₄ alkyl radicals;

amide groups —

CON(R_d)₂ wherein the R_d groups are, independently of one another, chosen from hydrogen atoms and C₁-C₄ alkyl radicals;

hydroxyl groups;

amino, alkylamino, and dialkylamino groups, wherein the alkyl radicals are chosen from linear and branched C₁-C₁₈ alkyl groups, optionally interrupted by a heteroatom chosen from N and O, and optionally substituted with at least one hydroxyl group;

—

NHNHCOR radicals wherein R is chosen from linear and branched C₁-C₁₀ alkyl groups;

groups of formula (b);

wherein;

R′

has the same definition as above;

R_b is chosen from;

 

chlorine atoms;

 

amino, alkylamino, and dialkylamino groups, wherein the alkyl radicals are chosen from linear and branched C₁-C₁₈ alkyl groups, optionally interrupted by a heteroatom chosen from N, O, and S, and optionally substituted with at least one hydroxyl;

 

saturated and unsaturated heterocycles comprising at least one nitrogen atom and optionally substituted, and

 

arylamino groups;

and y is equal to 0 or 1;

iii) Z is chosen from;

—

(CH₂)_m—

radicals wherein m is an integer ranging from 1 to 8

—

(CH₂CH₂O)_q— and

—

(OCH₂CH₂)_q—

radicals wherein q is an integer ranging from 1 to 15

aryl, alkylaryl, and arylalkyl radicals wherein the alkyl radicals are chosen from C₁-C₄ alkyl radicals and the aryl radicals are optionally substituted with at least one group —

SO₃M wherein M is chosen from hydrogen atoms, alkali metal atoms, and ammonium groups optionally substituted with at least one linear or branched C₁-C₁₈ alkyl radical optionally bearing at least one hydroxyl; and

z is chosen from 0 and 1.

4. The composition according to claim 2, wherein Y is chosen from the groups:

wherein the radicals R, R′

_a, and R_b have the meanings given in claim 2;

R″

_a has the same definition as R′

_a, wherein R″

_a and R′

_a are chosen independently of each other; and

R′

″

_a is chosen from hydrogen atoms and C₁-C₄ alkyl radicals.

5. The composition according to claim 2, wherein Z is chosen from:

wherein M, q, and m have the meanings given in claim 2.

6. The composition according to claim 2, wherein the at least one disulfide direct dye of formula (I) is chosen such that v is equal to 0.

7. The composition according to claim 2, wherein, in Formulae (I), (II), or (III), A and A′

are chosen from radicals comprising at least one chromophore derived from dyes of the following type;

acridines, acridones, anthranthrones, anthrapyrimidines, anthraquinones, azines, azos, azomethines, benzanthrones, benzimidazoles, benzimidazolones, benzindoles, benzoxazoles, benzopyrans, benzothiazoles, benzoquinones, bisazines, bisisoindolines, carboxanilides, coumarins, cyanins, diazines, diketopyrrolopyrroles, dioxazines, diphenylamines, diphenylmethanes, dithiazines, flavonoids, fluorindines, formazans, hydrazones, hydroxy ketones, indamines, indanthrones, indigoids and pseudo-indigoids, indophenols, indoanilines, isoindolines, isoindolinones, isoviolanthrones, lactones, methines, naphthalimides, naphthanilides, naphtholactams, naphthoquinones, nitro dyes, oxadiazoles, oxazines, perilones, perinones, perylenes, phenazines, phenothiazines, phthalocyanin, polyenes/carotenoids, porphyrins, pyranthrones, pyrazolanthrones, pyrazolones, pyrimidinoanthrones, pyronines, quinacridones, quinolines, quinophthalones, squaranes, stilbenes, tetrazoliums, thiazines, thioindigo, thiopyronines, triarylmethanes and xanthenes.

8. The composition according to claim 7, wherein, in Formulae (I), (II), or (III), A and A′

are chosen from radicals comprising a chromophore chosen from chromophores of the azo, anthraquinone, and hydrazone type.

9. The composition according to claims 1, wherein the at least one disulfide direct dye is chosen from:

and the following compounds, in acidic, basic or neutralized form;

wherein M is chosen from hydrogen atoms, alkali metal atoms, ammonium groups, and ammonium groups substituted with at least one radical chosen from linear and branched C₁-C₁₀ alkyl radicals optionally bearing at least one hydroxyl; and

the following compounds, and their salts, hydrates, and solvates;

10. The composition according to claim 2, wherein, in Formulae (I), (II), or (III), at least one of A and A′

comprises a cationic chromophore.

11. The composition according to claim 10, wherein the cationic chromophore comprises a cationic radical which is a quaternary ammonium.

12. The composition according to claim 2, wherein the at least one disulfide direct dye is a dye of Formula (I), (II), or (III) in which at least one of A and A′

is chosen from radicals comprising one or more cationic or non-cationic fluorescent chromophores.

13. The composition according to claim 12, wherein at least one of A and A′

comprises a styryl chromophore.

14. The composition according to claim 2, wherein X and X′

are, independently of one another, chosen from —

N(R)—

groups.

15. The composition according to claim 2, wherein the at least one disulfide direct dye is chosen such that v or v′

is equal to 0, and A and A′

are, independently of one another, chosen from W—

N═

N—

Ar—

, —

W—

N═

N—

Ar, W—

C(R^c)═

C(R^d)—

Ar—

, and —

W—

C(R^c)═

C(R^d)—

Ar groups, wherein W is chosen from fused and non-fused, aromatic and non-aromatic heterocycles comprising a quaternary ammonium;

Ar is chosen from (hetero)aryl radicals having from 5 to 6 ring members, and (hetero)aromatic bicyclic rings of naphthyl, benzopyridinium, indolinyl, or benzoindolinyl type, optionally substituted with at least one group chosen from halogen atoms, alkyl groups, hydroxyl groups, alkoxy groups, hydroxyalkyl groups, amino and (di)alkylamino groups, acylamino groups;

heterocycloalkyl and heteroaryl groups having from 5 to 6 ring members; and

wherein R_c and R_d are, independently of one another, chosen from hydrogen atoms and C₁-C₄ alkyl groups.

16. The composition according to claim 15, wherein W is chosen from imidazolium, pyridinium, benzopyridinium, benzimidazolium, quinolinium, pyrazolium, and benzothiazolium groups.

17. The composition according to claim 1, wherein the at least one disulfide direct dye is chosen from:

wherein M′

is chosen from organic and mineral acid salts.

18. The composition according to claim 1, wherein the at least one disulfide direct dye is chosen from

wherein:

G and G′

are, independently of one another, chosen from optionally substituted —

NR_cR_d, —

NR′

_cR′

_d, and C₁-C₆ alkoxy groups;

R_a and R′

_a are, independently of one another, chosen from aryl(C₁-C₄)alkyl and C₁-C₆ alkyl groups optionally substituted with hydroxyl, amino, C₁-C₄ alkylamino, and C₁-C₄ dialkylamino groups, said alkyl radicals possibly forming, with the nitrogen atom which bears them, a heterocycle comprising from 5 to 7 ring members, optionally comprising another heteroatom;

R_b, R′

_b are, independently of one another, chosen from hydrogen atoms, aryl(C₁-C₄)alkyl groups, and C₁-C₆ alkyl groups which are optionally substituted;

R_c, R′

_c, R_d and R′

_d are, independently of one another, chosen from hydrogen atoms, aryl(C₁-C₄)alkyl, C₁-C₆ alkoxy, and optionally substituted C₁-C₆ alkyl groups;

or else two adjacent radicals R_c and R_d, or R′

_c and R′

_d, borne by the same nitrogen atom together form a heterocyclic or heteroaryl group;

R_e and R′

_e are, independently of one another, chosen from optionally unsaturated, linear and branched, divalent C₁-C₆ alkylenyl hydrocarbon chains;

R_f and R′

_f are, independently of one another, chosen from quaternary ammonium groups (R″

)(R′

″

)(R″

″

)N⁺—

where R″

, R′

″ and

R″

″

are, independently of one another, chosen from hydrogen atoms and C₁-C₄ alkyl groups, or else (R″

)(R′

″

)(R″

″

)N⁺—

represents an optionally substituted cationic heteroaryl group;

R_g, R′

_g, R″

_g, R′

″

_g, R_h, R′

_h, R″

_h, and R′

″

_h are, independently of one another, chosen from hydrogen atoms, halogen atoms, amino, C₁-C₄ alkylamino, C₁-C₄ dialkylamino, cyano, carboxy, hydroxyl, and trifluoromethyl groups, acylamino, C₁-C₄ alkoxy, (poly)hydroxy(C₂-C₄)alkoxy, alkylcarbonyloxy, alkoxycarbonyl, and alkylcarbonylamino radicals, acylamino, carbamoyl, and alkylsulfonylamino radicals, aminosulfonyl radicals, and C₁-C₁₆ alkyl radicals optionally substituted with a group chosen from C₁-C₁₂ alkoxy, hydroxy, cyano, carboxy, amino, C₁-C₄ alkylamino, and C₁-C₄ dialkylamino groups, or else the two alkyl radicals borne by the nitrogen atom of the amino group form a heterocycle comprising from 5 to 7 ring members and optionally comprising another heteroatom;

or else two groups R_g and R′

_g;

R″

_g and R′

″

_g;

R_h, and R′

_h;

R″

_h and R′

″

_h;

borne by two adjacent carbon atoms together form a benzo or indeno ring, or a fused heterocycloalkyl or fused heteroaryl group;

the benzo, indeno, heterocycloalkyl or heteroaryl ring optionally being substituted with at least one group chosen from halogen atoms, amino, C₁-C₄ alkylamino, C₁-C₄ dialkylamino, nitro, cyano, carboxy, hydroxyl, and trifluoromethyl groups, acylamino, C₁-C₄ alkoxy, (poly)hydroxy(C₂-C₄)alkoxy, alkylcarbonyloxy, alkoxycarbonyl, and alkylcarbonylamino radicals, acylamino, carbamoyl, and alkylsulfonylamino radicals, aminosulfonyl radicals, and C₁-C₁₆ alkyl radicals optionally substituted with a group chosen from C₁-C₁₂ alkoxy, hydroxy, cyano, carboxy, amino, C₁-C₄ alkylamino, and C₁-C₄ dialkylamino groups, or else the two alkyl radicals borne by the nitrogen atom of the amino group form a heterocycle comprising from 5 to 7 ring members and optionally comprising another heteroatom;

or else when G is chosen from —

NR_cR_d groups and G′

is chosen from —

NR′

_cR′

_d groups, two groups R_c and R′

_g;

R′

_c and R″

_g;

R_d and R_g;

or R′

_d and R′

″

_g together form a saturated heteroaryl or heterocycle, optionally substituted with a C₁-C₆ alkyl group;

R_i, R′

_i, R″

_i, and R′

″

_i are, independently of one another, chosen from hydrogen atoms and C₁-C₄ alkyl groups;

R₁, R₂, R₃, R₄, R′

₁, R′

₂, R′

₃ and R′

₄ are, independently of one another, chosen from hydrogen atoms and C₁-C₄ alkyl, C₁-C₁₂ alkoxy, hydroxy, cyano, carboxy, amino, C₁-C₄ alkylamino, and C₁-C₄ dialkylamino groups, said alkyl radicals possibly forming with the nitrogen atom that bears them, a heterocycle comprising from 5 to 7 ring members, optionally comprising another heteroatom;

T_a and T_b are, independently of one another, chosen from;

i) a covalent bond σ

, ii) a group chosen from —

SO₂—

, —

O—

, —

S—

, —

N(R)—

, —

N⁺(R)(R^o)—

, and —

CO—

radicals, and combinations thereof, wherein R and R^o are, independently of one another, chosen from hydrogen atoms, C₁-C₄ alkyl, C₁-C₄ hydroxyalkyl radical, and aryl(C₁-C₄)alkyl radicals; and

iii) cationic and non-cationic heterocycloalkyl and heteroaryl radicals;

 

are, independently of one another, chosen from optionally substituted heterocyclic groups;

 

is chosen from aryl and heteroaryl groups fused to the phenyl ring;

or else lacking the phenyl ring;

m, m′

, n and n′

are, independently of one another, chosen from integers ranging from 0 to 6, wherein m+n and m′

+n′

are, independently of one another, chosen from integers ranging from 1 to 10; and

M′

is chosen from organic and mineral acid salts.

19. The composition according to claim 1, wherein the at least one disulfide direct dye is chosen from:

wherein M′

is chosen from organic and mineral acid salts.

20. The composition according to claim 1, wherein the at least one alkaline agent chosen from mineral and organic hydroxides is chosen from the hydroxides of alkali metals, alkaline-earth-metals, transition metals, lanthanides, and actinides, ammonium and guanidine hydroxides, and mixtures thereof.

21. The composition according to claim 20, wherein the at least one alkaline agent is chosen from sodium, potassium, calcium, and guanidine hydroxides, and mixtures thereof.

23. The composition according to claim 1, comprising from 0.001 to 10% by weight of disulfide direct dye(s) relative to the total weight of the composition.

24. The composition according to claim 1, wherein the cosmetically acceptable medium is a medium comprising water and optionally at least one organic solvent.

25. The composition according to claim 24, wherein the at least one organic solvent is chosen from C₁-C₄ lower alkanols, polyols, polyol ethers, aromatic alcohols, and mixtures thereof.

26. The composition according to claim 24, comprising from 1 to 40% by weight of the at least one organic solvent, relative to the total weight of the composition.

27. The composition according to claim 1, further comprising at least one inert organic liquid phase.

28. The composition according to claim 27, wherein the at least one inert organic liquid phase is chosen from polydecenes of formula C_10nH_[(20n)+2] wherein n varies from 3 to 9, esters, esters and diesters of sugars and of C₁₂-C₂₄ fatty acids, and cyclic esters, cyclic ethers, silicone oils, mineral oils, plant oils, and mixtures thereof.

29. The composition according to claim 27, wherein the at least one inert organic liquid phase is present in the composition in an amount ranging from 5 to 60% by weight, relative to the total weight of the composition.

30. The composition according to claim 1, further comprising at least one surfactant chosen from non-ionic, anionic, cationic, and amphoteric surfactants, and mixtures thereof.

31. The composition according to claim 30, wherein the at least one surfactant is present in an amount ranging from 0.5 to 30% by weight, relative to the total weight of the composition.

32. The composition according to claim 1, further comprising at least one additional direct dye of non-ionic, cationic, or anionic nature, wherein said additional direct dye does not comprise a disulfide bond.

33. The composition according to claim 32, comprising from 0.0005 to 12% by weight of additional direct dye(s), relative to the total weight of the composition.

22. The composition according to claim 22, the at least one alkaline agent is present in the composition in an amount ranging from 0.5 to 10% by weight relative to the weight of the composition.

34. A process for the simultaneous shaping, dyeing, and/or lightening of keratin fibers, comprising the application of a composition for treating keratin fibers to the keratin fibers for a sufficient time to obtain a desired shaping and dyeing, and/or lightening, and the optional rinsing and washing of the keratin fibers;

wherein the composition for treating keratin fibers comprises, in a cosmetically acceptable medium;

at least one disulfide direct dye; and

at least one alkaline agent chosen from mineral and organic hydroxides and present in the composition in an amount such that the pH of the composition ranges from 10 to 14.

35. The process according to claim 34, comprising the following steps:

a) the composition for treating keratin fiber is applied to the fibers;

b) the fibers are subjected to a mechanical shaping operation that makes it possible to give them a new shape;

c) the composition is left on for a time ranging from 10 to 30 minutes;

d) optionally, a smoothing operation is carried out; and

e) the hair is rinsed.

36. The process according to claim 34, wherein the composition for treating keratin fibers is applied to fibers having a tone level of less than or equal to 6.

37. The process according to claim 34, wherein the keratin fibers are artificially pigmented or colored.

38. A multi-compartment device, comprising at least one first compartment (i) comprising at least one alkaline agent chosen from mineral and organic hydroxides is chosen from the hydroxides of alkali metals, alkaline-earth-metals, transition metals, lanthanides, and actinides, ammonium and guanidine hydroxides, and mixtures thereof;

and at least one second compartment (ii) comprising a composition comprising at least one disulfide direct dye;

the pH of the mixture of the contents of the various compartments ranging from 10 to 14.

39. A multi-compartment device, comprising at least one first compartment (i) comprising guanidine carbonate and at least one disulfide direct dye;

and at least one second compartment (ii) comprising at least one alkaline agent chosen from alkali metal and alkaline-earth metal hydroxides;

the pH of the mixture of the contents of the various compartments ranging from 10 to 14.

40. A multi-compartment device, comprising at least one first compartment (i) comprising guanidine carbonate;

at least one second compartment (ii) comprising at least one alkaline agent chosen from alkali metal and alkaline-earth metal hydroxides; and

at least a third compartment (iii) comprising at least one disulfide direct dye;

the pH of the mixture of the contents of the various compartments ranging from 10 to 14.