US2010031453A1PendingUtilityA1
Composition for dyeing keratin fibres, comprising a cationic diazo direct dye containing a 2-imidazolium unit
Est. expiryJun 1, 2026(expired)· nominal 20-yr term from priority
C07D 233/88C07D 471/06
49
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Claims
Abstract
The present invention relates to a composition for dyeing keratin fibres, comprising at least one cationic diazo direct dye chosen from the compounds of formula (I) or (II) below, the mesomeric forms thereof, and also the acid-addition salts thereof and solvates thereof. The invention allows the production of colorations that are resistant to the various attacking factors to which the hair may be subjected, especially to shampooing. The invention also makes it possible to obtain blue or violet colorations, especially sparingly chromatic blue colorations, which lead to fundamental and/or natural shades. Moreover, the direct dyes used in the context of the invention are light-stable and stable under standard lightening dyeing conditions, in particular in the presence of an oxidizing agent and/or of ammonia.
Claims
exact text as granted — not AI-modified1 - 34 . (canceled)
35 . A composition for dyeing keratin fibers, comprising, in a suitable dyeing medium, at least one cationic diazo direct dye comprising a 2-imidazolium unit, chosen from the compounds of formula (I) and (II) below, the mesomeric forms thereof, and the acid-addition salts thereof:
wherein:
the radicals R 1 independently of each other, are chosen from:
a linear or branched, saturated, acyclic, optionally substituted C 1 -C 8 hydrocarbon-based chain, optionally interrupted with at least one heteroatom and/or with at least one group comprising at least one heteroatom, wherein the at least one heteroatom is chosen from oxygen, nitrogen, sulfur, CO, SO, and SO 2 , or combinations thereof; and wherein the hydrocarbon-based chain when attached to the nitrogen atom of the imidazolium ring does not comprise nitro, nitroso, peroxo, or diazo functions;
an optionally substituted phenyl radical; and
an optionally substituted benzyl radical;
the radicals R 2 , independently of each other are chosen from:
a linear C 1 -C 4 alkyl radical, optionally substituted with an amino radical or a hydroxyl radical;
an optionally substituted phenyl radical; and
a halogen atom;
the radicals R 3 , independently of each other are chosen from:
a linear C 1 -C 4 alkyl radical, optionally substituted with an amino radical or a hydroxyl radical;
a hydroxyl radical;
a C 1 -C 4 alkoxy radical;
a C 1 -C 4 monohydroxyalkoxy or polyhydroxyalkoxy radical;
an amino radical optionally substituted with one or two C 1 -C 4 alkyl radicals, which may be identical or different, optionally bearing at least one hydroxyl radical;
a group R a CO—NR a ′— in which the radical R a is chosen from a C 1 -C 4 alkyl radical and the radical R a ′ is chosen from a hydrogen atom and a C 1 -C 4 alkyl radical;
a group (R b ) 2 N—CO— wherein the radicals R b are chosen from, independently of each other, a hydrogen atom and a C 1 -C 4 alkyl radical;
a group (R c ) 2 N—CO—NR c — in which the radicals R c are chosen from, independently of each other, a hydrogen atom and a C 1 -C 4 alkyl radical;
a group (R d ) 2 N—SO 2 — in which the radicals R d are chosen from, independently of each other, a hydrogen atom and a C 1 -C 4 alkyl radical;
a group R e SO 2 —NR e — in which the radicals R e are chosen from, independently of each other, a hydrogen atom and a C 1 -C 4 alkyl radical;
a cyano radical; and
a halogen atom;
the radicals R 4 are chosen from, independently of each other:
a linear C 1 -C 4 alkyl radical;
a hydroxyl radical;
a C 1 -C 4 alkoxy radical;
a C 1 -C 4 monohydroxyalkoxy or polyhydroxyalkoxy radical;
an amino radical optionally substituted with one or two C 1 -C 4 alkyl radicals, which may be identical or different, the one or two alkyl radicals optionally bearing at least one hydroxyl radical; the two alkyl radicals optionally forming, together with the nitrogen atom to which they are attached, a 5 or 6-membered heterocycle optionally comprising another heteroatom identical to or different from nitrogen, and optionally substituted with at least one methyl, hydroxyl, amino, monomethylamino or dimethyl amino radicals;
a group R a CO—NR a ′— wherein the radical R a is chosen from a C 1 -C 4 alkyl radical and the radical R a ′ is chosen from a hydrogen atom and a C 1 -C 4 alkyl radical;
a group (R b ) 2 N—CO— wherein the radicals R b are chosen from, independently of each other, a hydrogen atom and a C 1 -C 4 alkyl radical;
a group (R c ) 2 N—CO—NR c — wherein the radicals R c are chosen from, independently of each other, a hydrogen atom and a C 1 -C 4 alkyl radical;
a group (R d ) 2 N—SO 2 in which the radicals R d are chosen from, independently of each other, a hydrogen atom and a C 1 -C 4 alkyl radical;
a group R e SO 2 —NR e — wherein the radicals R e are chosen from, independently of each other, a hydrogen atom and a C 1 -C 4 alkyl radical;
a cyano radical; and
a halogen atom;
the radicals R 5 and R 6 , which may be identical or different, are chosen from:
a hydrogen atom;
a linear or branched, saturated, acyclic, optionally substituted C 1 -C 8 hydrocarbon-based chain, optionally interrupted with at least one heteroatom and/or with at least one group comprising at least one heteroatom, wherein the at least one heteroatom is chosen from oxygen, nitrogen, sulfur, CO, SO, and SO 2 , or combinations thereof; and wherein the hydrocarbon-based chain does not comprise nitro, nitroso, peroxo, or diazo functions and being attached to the nitrogen atom via a carbon atom;
a radical (R f SO 2 —) wherein the radical R f is chosen from a C 1 -C 4 alkyl radical;
a benzyl radical optionally substituted with at least one hydroxyl and/or amino radicals;
the radicals R 5 and R 6 optionally forming, with the nitrogen atom to which they are attached, a saturated or unsaturated, optionally substituted 5- or 7-membered heterocycle, optionally comprising another heteroatom that is identical to or different from nitrogen; one of the radicals R 5 and R 6 optionally forming, with the nitrogen atom to which it is attached and with a radical R 4 located ortho to the group NR 5 R 6 , an optionally substituted 5- or 6-membered heterocycle of formula (III) below
wherein:
o is chosen from 0 and 1;
Rx and Ry are chosen from, independently of each other, a hydrogen atom and a methyl radical;
the radicals R 5 and R 6 optionally forming, with the nitrogen atom to which they are attached and each with a radical R 4 located ortho to the group NR 5 R 6 , an optionally substituted 5- or 6-membered heterocycle of formula (IV) below:
wherein:
o is chosen from 0 and 1;
Rx and Ry are chosen from, independently of each other, a hydrogen atom and a methyl radical;
n is chosen from 0, 1, and 2; when n is 0 or 1, the unsubstituted carbon atom bears a hydrogen atom;
n′ is chosen from 0, 1, 2, 3, and 4 when n′ is 0, 1, 2, or 3, the unsubstituted carbon atom bears a hydrogen atom;
n″ is chosen from 0, 1, 2, 3, and 4 when n″ is 0, 1, 2, or 3, the unsubstituted carbon atom bears a hydrogen atom; and
the electrical neutrality of the compounds of formula (I) or (II) being assured by at least one identical or different cosmetically acceptable anions An.
36 . A composition according to claim 35 , wherein one of the radicals R 5 or R 6 forms, with the nitrogen atom to which it is attached and with a radical R 4 located ortho to the group NR 5 R 6 , one of the substituted or unsubstituted, saturated or unsaturated 5- or 6-membered heterocycles having the following formulae:
wherein p is chosen from 0 and 1.
37 . A composition according to claim 35 , wherein the radicals R 5 and
R 6 form, with the nitrogen atom to which they are attached and each with a radical R 4 located ortho to the group NR 5 R 6 , an optionally substituted 5- or 6-membered heterocycle of formula (IV) below:
wherein:
o is chosen from 0 and 1; and
Rx and Ry are chosen from, independently of each other, a hydrogen atom and a methyl radical.
38 . A composition according to claim 35 , wherein the radicals R 5 and R 6 form, together with the nitrogen atom to which they are attached and each with a radical R 4 located ortho to the group NR 5 R 6 , one of the substituted or unsubstituted, saturated or unsaturated 5- or 6-membered heterocycles having the following formulae:
wherein p is chosen from 0 and 1.
39 . A composition according to claim 35 , wherein An is chosen from halides; hydroxide; sulfates; hydrogen sulfates; alkyl sulfates for which the linear or branched alkyl part is of C 1 -C 6 ; carbonates; hydrogen carbonates; carboxylic acid salts; alkylsulfonates for which the linear or branched alkyl part is of C 1 -C 6 ; arylsulfonates for which the aryl part is optionally substituted with at least one C 1 -C 4 alkyl radical; and alkylsulfonyl.
40 . A composition according to claim 35 , wherein the said direct dye of formula (I) and (II) are chosen from the direct dyes of formula (I′) and (II′) below:
wherein:
the radicals R′ 1 , are chose from, independently of each other, a C 1 -C 4 alkyl radical and a 2-hydroxyethyl radical;
the radicals R′ 3 are chosen from, independently of each other, a C 1 -C 4 alkyl radical; a C 1 -C 4 alkoxy radical; a halogen atom; a hydroxyl radical; and a methylcarbonylamino radical;
m′ is chosen from 0, 1 and 2;
the radicals R′ 4 is chosen from, independently of each other, a C 1 -C 4 alkyl radical; a hydroxyl radical; an alkoxy radical; a mono(alkyl)amino radical, a di(alkyl)amino radical; a di(hydroxyalkyl)amino radical; a halogen atom; and a (C 1 -C 4 ) alkylcarbonylamino radical;
m″ is chosen from 0, 1, 2 and 3;
the radicals R 15 and R 16 are chosen from, independently of each other, a C 1 -C 4 alkyl radical; and a C 1 -C 4 mono-hydroxyalkyl radical; or form, with one or two radicals R′ 4 located ortho to the group NR 15 R 16 and the benzene nucleus to which they are attached, a ring of formula (III) and (IV).
41 . A composition according to claim 35 wherein the said direct dye of formula (I) is chosen from the compounds presented in the table below,
Dye 1
Dye 2
Dye 3
Dye 4
Dye 5
Dye 6
Dye 7
Dye 8
Dye 9
Dye 10
Dye 11
wherein An is chosen from halides; hydroxide; sulfates; hydrogen sulfates; alkyl sulfates for which the linear or branched alkyl part is of C 1 -C 6 ; carbonates; hydrogen carbonates, carboxylic acid salts; alkylsulfonates for which the linear or branched alkyl part is of C 1 -C 6 ; arylsulfonates for which the aryl part is optionally substituted with at least one C 1 -C 4 alkyl radical and alkylsulfonyls:
42 . A composition according to claim 35 , wherein the said direct dye is is present in an amount ranging from 0.01% to 5% by weight relative to the total weight of the composition.
43 . A composition according to claim 35 , further comprising at least one oxidation base chosen from para-phenylenediamines, bis(phenyl)alkylene-diamines, para-aminophenols, ortho-aminophenols, and heterocyclic bases.
44 . A composition according to claim 43 , wherein the oxidation base is present in an amount ranging from 0.001% to 10% by weight relative to the total weight of the composition.
45 . A composition according to claim 35 , further comprising at least one coupler chosen from metaphenylenediamines, meta-aminophenols, meta-diphenols, naphthalene-based couplers, and heterocyclic couplers.
46 . A composition according to claim 45 , wherein the coupler is present in an amount ranging from 0.001% to 10% by weight relative to the total weight of the composition.
47 . A composition according to claim 35 , further comprising an additional direct dye is chosen from nitrobenzene dyes, azo, azomethine, methine, tetraazapentamethine, anthraquinone, naphthoquinone, benzoquinone, phenothiazine, indigoid, xanthene, phenanthridine, phthalocyanin and triarylmethane-based dyes, and natural dyes, alone or as mixtures.
48 . A composition according to claim 47 , wherein the said additional direct dye is present in an amount ranging from 0.001% to 20% by weight approximately relative to the total weight of the composition.
49 . A composition according to claim 35 , wherein the composition further comprises at least one additive chosen from anionic, cationic, nonionic, amphoteric or zwitterionic surfactants or mixtures thereof, anionic, cationic, nonionic, amphoteric or zwitterionic polymers or mixtures thereof, mineral or organic thickeners, antioxidants, penetrants, sequestrants, fragrances, buffers, dispersants, conditioning agents, film-forming agents, ceramides, preserving agents, stabilizers, and opacifiers.
50 . A composition according to claim 35 , further comprising at least one oxidizing agent.
51 . A composition according to claim 50 , wherein the oxidizing agent is chosen from hydrogen peroxide, urea peroxide, alkali metal bromates, persalts, and enzymes.
52 . A process for dyeing keratin fibers that comprises placing a composition in contact with the said wet or dry fibers, for a time that is sufficient to obtain the desired effect, the composition for dyeing keratin fibers, comprising, in a suitable dyeing medium, at least one cationic diazo direct dye comprising a 2-imidazolium unit, chosen from the compounds of formula (I) and (II) below, the mesomeric forms thereof, and the acid-addition salts thereof:
wherein:
the radicals R 1 independently of each other, are chosen from:
a linear or branched, saturated, acyclic, optionally substituted C 1 -C 8 hydrocarbon-based chain, optionally interrupted with at least one heteroatom and/or with at least one group comprising at least one heteroatom, wherein the at least one heteroatom is chosen from oxygen, nitrogen, sulfur, CO, SO, and SO 2 , or combinations thereof; and wherein the hydrocarbon-based chain when attached to the nitrogen atom of the imidazolium ring does not comprise nitro, nitroso, peroxo, or diazo functions;
an optionally substituted phenyl radical; and
an optionally substituted benzyl radical;
the radicals R 2 , independently of each other are chosen from:
a linear C 1 -C 4 alkyl radical, optionally substituted with an amino radical or a hydroxyl radical;
an optionally substituted phenyl radical; and
a halogen atom;
the radicals R 3 , independently of each other are chosen from:
a linear C 1 -C 4 alkyl radical, optionally substituted with an amino radical or a hydroxyl radical;
a hydroxyl radical;
a C 1 -C 4 alkoxy radical;
a C 1 -C 4 monohydroxyalkoxy or polyhydroxyalkoxy radical;
an amino radical optionally substituted with one or two C 1 -C 4 alkyl radicals, which may be identical or different, optionally bearing at least one hydroxyl radical;
a group R a CO—NR a ′— in which the radical R a is chosen from a C 1 -C 4 alkyl radical and the radical R a ′ is chosen from a hydrogen atom and a C 1 -C 4 alkyl radical;
a group (R b ) 2 N—CO— wherein the radicals R b are chosen from, independently of each other, a hydrogen atom and a C 1 -C 4 alkyl radical;
a group (R c ) 2 N—CO—NR c — in which the radicals R c are chosen from, independently of each other, a hydrogen atom and a C 1 -C 4 alkyl radical;
a group (R d ) 2 N—SO 2 — in which the radicals R d are chosen from, independently of each other, a hydrogen atom and a C 1 -C 4 alkyl radical;
a group R e SO 2 —NR e — in which the radicals R e are chosen from, independently of each other, a hydrogen atom and a C 1 -C 4 alkyl radical;
a cyano radical; and
a halogen atom;
the radicals R 4 are chosen from, independently of each other:
a linear C 1 -C 4 alkyl radical;
a hydroxyl radical;
a C 1 -C 4 alkoxy radical;
a C 1 -C 4 monohydroxyalkoxy or polyhydroxyalkoxy radical;
an amino radical optionally substituted with one or two C 1 -C 4 alkyl radicals, which may be identical or different, the one or two alkyl radicals optionally bearing at least one hydroxyl radical; the two alkyl radicals optionally forming, together with the nitrogen atom to which they are attached, a 5 or 6-membered heterocycle optionally comprising another heteroatom identical to or different from nitrogen, and optionally substituted with at least one methyl, hydroxyl, amino, monomethylamino or dimethyl amino radicals;
a group R a CO—NR a ′— wherein the radical R a is chosen from a C 1 -C 4 alkyl radical and the radical R a ′ is chosen from a hydrogen atom and a C 1 -C 4 alkyl radical;
a group (R b ) 2 N—CO— wherein the radicals R b are chosen from, independently of each other, a hydrogen atom and a C 1 -C 4 alkyl radical;
a group (R c ) 2 N—CO—NR c — wherein the radicals R c are chosen from, independently of each other, a hydrogen atom and a C 1 -C 4 alkyl radical;
a group (R d ) 2 N—SO 2 in which the radicals R d are chosen from, independently of each other, a hydrogen atom and a C 1 -C 4 alkyl radical;
a group R e SO 2 —NR e — wherein the radicals R e are chosen from, independently of each other, a hydrogen atom and a C 1 -C 4 alkyl radical;
a cyano radical; and
a halogen atom;
the radicals R 5 and R 6 , which may be identical or different, are chosen from:
a hydrogen atom;
a linear or branched, saturated, acyclic, optionally substituted C 1 -C 8 hydrocarbon-based chain, optionally interrupted with at least one heteroatom and/or with at least one group comprising at least one heteroatom, wherein the at least one heteroatom is chosen from oxygen, nitrogen, sulfur, CO, SO, and SO 2 , or combinations thereof; and wherein the hydrocarbon-based chain does not comprise nitro, nitroso, peroxo, or diazo functions and being attached to the nitrogen atom via a carbon atom;
a radical (R f SO 2 —) wherein the radical R f is chosen from a C 1 -C 4 alkyl radical;
a benzyl radical optionally substituted with at least one hydroxyl and/or amino radicals;
the radicals R 5 and R 6 optionally forming, with the nitrogen atom to which they are attached, a saturated or unsaturated, optionally substituted 5- or 7-membered heterocycle, optionally comprising another heteroatom that is identical to or different from nitrogen; one of the radicals R 5 and R 6 optionally forming, with the nitrogen atom to which it is attached and with a radical R 4 located ortho to the group NR 5 R 6 , an optionally substituted 5- or 6-membered heterocycle of formula (III) below
wherein:
o is chosen from 0 and 1;
Rx and Ry are chosen from, independently of each other, a hydrogen atom and a methyl radical;
the radicals R 5 and R 6 optionally forming, with the nitrogen atom to which they are attached and each with a radical R 4 located ortho to the group NR 5 R 6 , an optionally substituted 5- or 6-membered heterocycle of formula (IV) below:
wherein:
o is chosen from 0 and 1;
Rx and Ry are chosen from, independently of each other, a hydrogen atom and a methyl radical;
n is chosen from 0, 1, and 2; when n is 0 or 1, the unsubstituted carbon atom bears a hydrogen atom;
n′ is chosen from 0, 1, 2, 3, and 4 when n′ is 0, 1, 2, or 3, the unsubstituted carbon atom bears a hydrogen atom;
n″ is chosen from 0, 1, 2, 3, and 4 when n″ is 0, 1, 2, or 3, the unsubstituted carbon atom bears a hydrogen atom; and
the electrical neutrality of the compounds of formula (I) or (II) being assured by at least one identical or different cosmetically acceptable anions An.
53 . A multi-compartment device, wherein a first compartment contains a composition for dyeing keratin fibers and a second compartment contains an oxidizing composition, and wherein the composition for dyeing keratin fibers, comprises, in a suitable dyeing medium, at least one cationic diazo direct dye comprising a 2-imidazolium unit, chosen from the compounds of formula (I) and (II) below, the mesomeric forms thereof, and the acid-addition salts thereof:
wherein:
the radicals R 1 , independently of each other, are chosen from:
a linear or branched, saturated, acyclic, optionally substituted C 1 -C 8 hydrocarbon-based chain, optionally interrupted with at least one heteroatom and/or with at least one group comprising at least one heteroatom, wherein the at least one heteroatom is chosen from oxygen, nitrogen, sulfur, CO, SO, and SO 2 , or combinations thereof; and wherein the hydrocarbon-based chain when attached to the nitrogen atom of the imidazolium ring does not comprise nitro, nitroso, peroxo, or diazo functions;
an optionally substituted phenyl radical; and
an optionally substituted benzyl radical;
the radicals R 2 , independently of each other are chosen from:
a linear C 1 -C 4 alkyl radical, optionally substituted with an amino radical or a hydroxyl radical;
an optionally substituted phenyl radical; and
a halogen atom;
the radicals R 3 , independently of each other are chosen from:
a linear C 1 -C 4 alkyl radical, optionally substituted with an amino radical or a hydroxyl radical;
a hydroxyl radical;
a C 1 -C 4 alkoxy radical;
a C 1 -C 4 monohydroxyalkoxy or polyhydroxyalkoxy radical;
an amino radical optionally substituted with one or two C 1 -C 4 alkyl radicals, which may be identical or different, optionally bearing at least one hydroxyl radical;
a group R a CO—NR a ′— in which the radical R a is chosen from a C 1 -C 4 alkyl radical and the radical R a ′ is chosen from a hydrogen atom and a C 1 -C 4 alkyl radical;
a group (R b ) 2 N—CO— wherein the radicals R b are chosen from, independently of each other, a hydrogen atom and a C 1 -C 4 alkyl radical;
a group (R c ) 2 N—CO—NR c — in which the radicals R c are chosen from, independently of each other, a hydrogen atom and a C 1 -C 4 alkyl radical;
a group (R d ) 2 N—SO 2 — in which the radicals R d are chosen from, independently of each other, a hydrogen atom and a C 1 -C 4 alkyl radical;
a group R e SO 2 —NR e — in which the radicals R e are chosen from, independently of each other, a hydrogen atom and a C 1 -C 4 alkyl radical;
a cyano radical; and
a halogen atom;
the radicals R 4 are chosen from, independently of each other:
a linear C 1 -C 4 alkyl radical;
a hydroxyl radical;
a C 1 -C 4 alkoxy radical;
a C 1 -C 4 monohydroxyalkoxy or polyhydroxyalkoxy radical;
an amino radical optionally substituted with one or two C 1 -C 4 alkyl radicals, which may be identical or different, the one or two alkyl radicals optionally bearing at least one hydroxyl radical; the two alkyl radicals optionally forming, together with the nitrogen atom to which they are attached, a 5 or 6-membered heterocycle optionally comprising another heteroatom identical to or different from nitrogen, and optionally substituted with at least one methyl, hydroxyl, amino, monomethylamino or dimethyl amino radicals;
a group R a CO—NR a ′— wherein the radical R a is chosen from a C 1 -C 4 alkyl radical and the radical R a ′ is chosen from a hydrogen atom and a C 1 -C 4 alkyl radical;
a group (R b ) 2 N—CO— wherein the radicals R b are chosen from, independently of each other, a hydrogen atom and a C 1 -C 4 alkyl radical;
a group (R c ) 2 N—CO—NR c — wherein the radicals R c are chosen from, independently of each other, a hydrogen atom and a C 1 -C 4 alkyl radical;
a group (R d ) 2 N—SO 2 in which the radicals R d are chosen from, independently of each other, a hydrogen atom and a C 1 -C 4 alkyl radical;
a group R e SO 2 —NR e — wherein the radicals R e are chosen from, independently of each other, a hydrogen atom and a C 1 -C 4 alkyl radical;
a cyano radical; and
a halogen atom;
the radicals R 5 and R 6 , which may be identical or different, are chosen from:
a hydrogen atom;
a linear or branched, saturated, acyclic, optionally substituted C 1 -C 8 hydrocarbon-based chain, optionally interrupted with at least one heteroatom and/or with at least one group comprising at least one heteroatom, wherein the at least one heteroatom is chosen from oxygen, nitrogen, sulfur, CO, SO, and SO 2 , or combinations thereof; and wherein the hydrocarbon-based chain does not comprise nitro, nitroso, peroxo, or diazo functions and being attached to the nitrogen atom via a carbon atom;
a radical (R f SO 2 —) wherein the radical R f is chosen from a C 1 -C 4 alkyl radical;
a benzyl radical optionally substituted with at least one hydroxyl and/or amino radicals;
the radicals R 5 and R 6 optionally forming, with the nitrogen atom to which they are attached, a saturated or unsaturated, optionally substituted 5- or 7-membered heterocycle, optionally comprising another heteroatom that is identical to or different from nitrogen; one of the radicals R 5 and R 6 optionally forming, with the nitrogen atom to which it is attached and with a radical R 4 located ortho to the group NR 5 R 6 , an optionally substituted 5- or 6-membered heterocycle of formula (III) below
wherein:
o is chosen from 0 and 1;
Rx and Ry are chosen from, independently of each other, a hydrogen atom and a methyl radical;
the radicals R 5 and R 6 optionally forming, with the nitrogen atom to which they are attached and each with a radical R 4 located ortho to the group NR 5 R 6 , an optionally substituted 5- or 6-membered heterocycle of formula (IV) below:
wherein:
o is chosen from 0 and 1;
Rx and Ry are chosen from, independently of each other, a hydrogen atom and a methyl radical;
n is chosen from 0, 1, and 2; when n is 0 or 1, the unsubstituted carbon atom bears a hydrogen atom;
n′ is chosen from 0, 1, 2, 3, and 4 when n′ is 0, 1, 2, or 3, the unsubstituted carbon atom bears a hydrogen atom;
n″ is chosen from 0, 1, 2, 3, and 4 when n″ is 0, 1, 2, or 3, the unsubstituted carbon atom bears a hydrogen atom; and
the electrical neutrality of the compounds of formula (I) or (II) being assured by at least one identical or different cosmetically acceptable anions An.
54 . A composition according to claim 35 , wherein a cationic diazo direct dye of formula (I) and (II) is not the compounds below:
and also the mesomeric forms thereof, the acid-addition salts thereof.Join the waitlist — get patent alerts
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