Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
  • A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
  • A61K8/49—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing heterocyclic compounds
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
  • A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
  • A61K8/49—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing heterocyclic compounds
  • A61K8/4906—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing heterocyclic compounds with one nitrogen as the only hetero atom
  • A61K8/4926—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing heterocyclic compounds with one nitrogen as the only hetero atom having six membered rings
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
  • A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
  • A61K8/49—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing heterocyclic compounds
  • A61K8/494—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing heterocyclic compounds with more than one nitrogen as the only hetero atom
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
  • A61Q5/00—Preparations for care of the hair
  • A61Q5/06—Preparations for styling the hair, e.g. by temporary shaping or colouring
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
  • A61Q5/00—Preparations for care of the hair
  • A61Q5/06—Preparations for styling the hair, e.g. by temporary shaping or colouring
  • A61Q5/065—Preparations for temporary colouring the hair, e.g. direct dyes
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
  • A61Q5/00—Preparations for care of the hair
  • A61Q5/10—Preparations for permanently dyeing the hair
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
  • A61K2800/40—Chemical, physico-chemical or functional or structural properties of particular ingredients
  • A61K2800/42—Colour properties
  • A61K2800/43—Pigments; Dyes
  • A61K2800/434—Luminescent, Fluorescent; Optical brighteners; Photosensitizers

Definitions

• the present invention relates to the use, for the dyeing with lightening effect of human keratin substances, and in particular of human keratin fibres such as the hair, of a composition comprising at least one fluorescent cyanine dye.
• This method consists in bleaching the melanins of the keratin fibres by an oxidizing system, which is generally composed of hydrogen peroxide in combination or not with persalts. This operation may or may not be carried out in the presence of direct dyes and/or oxidation dyes.
• This bleaching system has the disadvantage of degrading the fibres and of impairing their cosmetic properties.
• the hair tends to become harsh, more difficult to disentangle and more fragile.
• compositions available that allow the keratin fibres to be lightened at the same time as being dyed, aesthetically, without degrading these fibres.
• Patent application FR 2 853 229 describes the use, for dyeing with lightening effect human keratin substances, and in particular human keratin fibres such as the hair, of fluorescent dyes in the form of dimers, and in particular of dimers of 2- (2- [4-dimethylaminophenyl] - vinyl) -1-ethylpyridinium, the two 2- (2- [4-dimethylaminophenyl] vinyl) -1-ethylpyridinium molecules being joined to one another via a linker at the pyridinium ring.
• the shampoo resistance of the dyeings obtained is improved, but the lightening effect is less substantial than with 2- (2- [4-dimethylaminophenyl] vinyl) -1-ethylpyridinium.
• the aim of the present invention is to provide new compositions for colouring, with lightening effect, human keratin substances, said compositions not exhibiting the disadvantages of the prior-art compositions.
• the aim of the present invention is to provide new dyes for dyeing, with lightening effect, human keratin substances, said dyes exhibiting high tinctorial affinity for keratin substances, good properties of resistance towards external agents and in particular shampoos, and also allowing optical lightening to be obtained without impairing the substance treated.
• the present invention provides for the use, for the dyeing with lightening effect of human keratin substances, of a composition
• a composition comprising, in a cosmetically acceptable medium, at least one fluorescent cyanine dye selected from the compounds of formulae (I) or (II) below and their addition salts with an acid or a base: in which:
• linker represents a saturated or unsaturated aliphatic or alicyclic Ci-Ci 2 , preferably C 2 -C 8 , hydrocarbon chain, it being possible for one or more carbon atoms of the hydrocarbon chain to be replaced by one or more oxygen atoms, one or more groups NR where R is a hydrogen atom or an alkyl radical, the hydrocarbon chain containing no diazo, nitro, nitroso or peroxide group, and it not being possible for the hydrocarbon chain to be terminated at one or the other of its ends by a heteroatom;
• Rl represents a linear Ci-C 8 , preferably Ci-C 4 , alkyl radical which is optionally substituted in terminal position by a hydroxyl radical or an alkoxy radical;
• R2 represents a hydrogen atom; a halo radical; an alkyl radical; an alkoxy radical; an amino radical which is optionally substituted by one or more Ci-C 4 alkyl radicals which are themselves optionally substituted by one or more hydroxyl radicals;
• R3 represents a linear Ci-C 8 , preferably Ci-C 4 , alkyl radical which is optionally substituted in terminal position by a hydroxyl radical or an alkoxy radical; it being possible for the two radicals R3 to form, with the linker and the nitrogen atoms to which they are attached, a 6- or 7-membered saturated heterocycle of formula :
• n 1 or 2; and • X " represents a counterion.
• the present invention likewise provides a method of dyeing, with lightening effect, human keratin substances that employs the composition useful in the context of the invention.
• the present invention additionally provides a multicompartment device for implementing the method in accordance with the invention.
• the present invention further provides new fluorescent cyanine dyes and also a composition for dyeing, with lightening effect, human keratin substances, comprising at least one such fluorescent dye.
• the present invention further provides a composition for dyeing, with lightening effect, human keratin substances, comprising at least one fluorescent cyanine dye and at least one additive conventionally used in the field of cosmetology.
• the present invention allows human keratin substances to be coloured and at the same time lightened without impairing them.
• the present invention makes it possible to obtain a dyeing or colouring for which the reflectance of the substances treated in accordance with the invention, when measured between 550 and 700 nm, is greater than the reflectance of the untreated substances.
• the invention allows a dyeing to be obtained which is lighter than the natural colouring, with a satisfactory aesthetic effect.
• the compounds employed exhibit high tinctorial affinity for human keratin substances and good properties of resistance towards external agents, and especially towards shampoos.
• the treated keratin substances are in the form of fibres, and more particularly in the form of pigmented keratin fibres or artificially dyed fibres. These fibres are preferably hair.
• the pigmented or artificially dyed hair has a tone level of less than or equal to 6 (dark blond) and preferably less than or equal to 4 (brown) .
• a fluorescent dye is for the purposes of the present invention a dye which, like any conventional dye, is a molecule which dyes by itself and absorbs light in the visible part of the spectrum and possibly in the ultraviolet region, but which, in contrast to the conventional dye, re-emits a fluorescent light in the visible spectrum, at a greater wavelength than that of the light absorbed.
• the wavelength of the light re-emitted is between 400 and 700 nm.
• examples of a saturated aliphatic Ci-Ci 2 hydrocarbon chain include ethylene, propylene and butylene groups.
• Examples of unsaturated alicyclic Ci-Ci 2 hydrocarbon chain include the group of formula:
• alkyl radical is a linear or branched radical containing, unless otherwise indicated, 1 to 10 carbon atoms, preferably 1 to 6 carbon atoms, for example a methyl, ethyl, n-propyl, isopropyl, n-butyl or tert- butyl radical.
• An alkoxy radical is a radical alk-0-, the alkyl radical being as defined above.
• linear Ci-C 8 alkyl radicals which can be substituted in terminal position by a hydroxyl radical or an alkoxy radical include 2-hydroxyethyl ; 3 -hydroxy- n-propyl; 4-hydroxy-n-butyl ; 2-methoxyethyl ; 3-methoxy- n-propyl; and 4-methoxy-n-butyl .
• a halo radical denotes a halogen atom selected from chlorine, bromine, iodine, and fluorine.
• the linker is selected from an alkylene radical and an alkylene aralkylene radical.
• the linker is preferably selected from an ethylene radical; a propylene radical; a butylene radical; a hexylene radical; and a group of formula :
• the linker is selected from an ethylene radical; a butylene radical; and a hexylene radical .
• Rl represents an alkyl radical.
• Rl is preferably selected from a methyl radical and an ethyl radical .
• R2 is selected from a hydrogen atom; an alkyl radical; an alkoxy radical; and a halo radical.
• R2 is preferably a hydrogen atom.
• R3 represents an alkyl radical .
• R3 preferably represents a methyl radical.
• counterions X " include halide ions such as chloride, bromide, fluoride or iodide ion, hydroxide ion, hydrogen sulphate ion, and Ci-C 6 alkyl sulphate ions such as methyl sulphate or ethyl sulphate.
• Examples of compounds of formulae (I) or [ I D include the compounds set out in the table below:
• the two first synthesis steps are inspired by conditions described in the following reference: Farmaco 1989, 1167.
• the third synthesis step is inspired by conditions described in the following reference: J. Chem. Soc . Perkin Trans. I, 2000, 3559.
• the condensation step is described in the following reference: J. Heterocyclic Chemistry 16(8), 1583-7, 1979.
• a particularly interesting synthesis pathway in the context of the invention is the following pathway:
• N-alkylation reaction of an N-alkylaniline and the formylation reaction of an N, N-dialkylaniline are described, respectively, in the following references: Recueil destician chimiques des Pays-Bas et de Ia College, 77, 559-568, 1958 and Organic preparations and procedures international, 36(4), 337-340, 2004.
• the condensation step is described in the following reference: J. Heterocyclic Chemistry 16(8), 1583-7, 1979.
• the fluorescent dye or dyes may be present in a form which is soluble or insoluble in the medium of the composition at ambient temperature (between 15 and 25 0 C) .
• the fluorescent dye or dyes which are useful in the context of the invention represent in general from 0.01% to 20% by weight relative to the total weight of the composition, more particularly from 0.05% to 10% by weight relative to the total weight of the composition, and preferably from 0.1% to 5% by weight relative to the total weight of the composition.
• the cosmetically acceptable medium is generally composed of water or of a mixture of water and at least one organic solvent.
• organic solvent mention may be made, for example, of linear or branched alkanols containing 1 to 4 carbon atoms, such as ethanol and isopropanol ; polyols and polyol ethers, such as glycerol, 2-butoxyethanol , propylene glycol, propylene glycol monomethyl ether, monoethyl ether, diethylene glycol monomethyl ether, dimethoxyethane, aromatic alcohols such as benzyl alcohol or phenoxyethanol , ketones containing 3 to 4 carbon atoms, and Ci-C 4 alkyl acetates, these compounds being alone or in mixtures .
• linear or branched alkanols containing 1 to 4 carbon atoms such as ethanol and isopropanol
• polyols and polyol ethers such as glycerol, 2-butoxyethanol , propylene glycol, propylene glycol monomethyl ether, monoethyl ether, diethylene glycol monomethyl ether
• the solvents represent from 1% to 40% by weight approximately relative to the total weight of the composition, and more advantageously from 5% to 30% by weight approximately relative to the total weight of the composition.
• the pH of the composition which is useful in the context of the invention is generally between approximately 3 and 12, and preferably between approximately 5 and 11.
• the acidifying agents include, by way of example, organic or inorganic acids such as hydrochloric acid, ortho-phosphoric acid, sulphuric acid, carboxylic acids such as acetic acid, tartaric acid, citric acid and lactic acid, and sulphonic acids.
• organic or inorganic acids such as hydrochloric acid, ortho-phosphoric acid, sulphuric acid, carboxylic acids such as acetic acid, tartaric acid, citric acid and lactic acid, and sulphonic acids.
• Alkalifying agents include, by way of example, aqueous ammonia, alkali metal carbonates, alkanolamines such as mono-, di- and triethanolamines and derivatives thereof, sodium hydroxide or potassium hydroxide, and the compounds of formula (III) below:
• W is a propylene residue which is optionally substituted by a hydroxyl group or a Ci-C 6 alkyl radical
• R 4 , R 5 , R 6 and R 7 which are identical or different, represent a hydrogen atom or a Ci-C 6 alkyl radical which optionally carries at least one hydroxyl radical .
• composition useful in the context of the present invention may further comprise one or more additional fluorescent compounds which are soluble in the medium.
• additional fluorescent compounds include the fluorescent compounds belonging to the following classes: naphthalimides,- cationic or non-cationic coumarins; xanthenodiquinolizines (such as, in particular, sulphorhodamines) ; azaxanthenes ; naphtho- lactams; azlactones,- oxazines,- thiazines,- dioxazines,- pyrenes,- and nitrobenzoxadiazoles, alone or in mixtures .
• R 8 represents a methyl or ethyl radical
• R 9 represents a methyl radical
• Y " represents an iodide, chloride, sulphate or methosulphate anion.
• R 8 represents an ethyl radical
• R 9 a methyl radical
• composition useful in the context of the present invention may further comprise one or more additional fluorescent compounds which are insoluble in the medium, among which mention may be made of compounds based on zinc oxide or zinc sulphide, and also fluorescent organic compounds made from fluorescent dyes which are dissolved beforehand in a resin vehicle to give a solid which is subsequently ground.
• additional fluorescent compounds which are insoluble in the medium, among which mention may be made of compounds based on zinc oxide or zinc sulphide, and also fluorescent organic compounds made from fluorescent dyes which are dissolved beforehand in a resin vehicle to give a solid which is subsequently ground.
• the additional fluorescent compound or compounds represent in general from 0.05% to 10% by weight relative to the total weight of the composition, preferably from 0.1% to 5% by weight relative to the total weight of the composition.
• composition useful in the context of the invention may further comprise at least one additional, non- fluorescent, direct dye.
• More particularly said additional dye is nonionic, cationic or anionic.
• these direct dyes are selected from nitrobenzene dyes, azo, azomethine, methine, anthraquinone, naphthoquinone, benzoquinone, pheno- thiazine, indigoid, xanthene, phenanthridine and phthalocyanine dyes, and those derived from triarylmethane, alone or in mixtures.
• These additional direct dyes may in particular be basic dyes, among which mention may be made more particularly of the dyes known in the Colour Index, 3 rd edition, under the names Basic Brown 16, Basic Brown 17, Basic Yellow 57, Basic Red 76, Basic Violet 10, Basic Blue 26 and Basic Blue 99, or acidic direct dyes, among which mention may be made more particularly of the dyes known in the Colour Index, 3 rd edition, under the names Acid Orange 7, Acid Orange 24, Acid Yellow 36, Acid Red 33, Acid Red 184, Acid Black 2, Acid Violet 43 and Acid Blue 62, or else cationic direct dyes such as those described in patent applications WO 95/01772, WO 95/15144 and EP 714954, the content of which forms an integral part of the present invention.
• the red or orange nitrobenzene dyes may include for example the following compounds: - l-hydroxy-3-nitro-4-N- ( ⁇ -hydroxypropyl) aminobenzene,
• the yellow and green-yellow additional nitrobenzene direct dyes may include for example the compounds selected from:
• the blue or violet additional nitrobenzene direct dyes include for example the compounds selected from:
• - Rn represents a Ci-C 4 alkyl radical or a ⁇ - hydroxyethyl or ⁇ -hydroxypropyl or ⁇ -hydroxypropyl radical ;
• Ri o and R i2 which are identical or different, represent a ⁇ -hydroxyethyl, ⁇ -hydroxypropyl, ⁇ - hydroxypropyl or ⁇ , ⁇ -dihydroxypropyl radical, at least one of the radicals Rn, R i2 or Ri 0 representing a ⁇ - hydroxypropyl radical, and it not being possible for Rn and Ri 2 simultaneously to denote a ⁇ -hydroxyethyl radical when Ri 0 is a ⁇ -hydroxypropyl radical; such as those described in French patent FR 2 692 572.
• the additional, non-fluorescent , direct dye or dyes represent preferably from 0.0005% to 12% by weight approximately of the total weight of the composition, and more preferably still from 0.005% to 6% by weight approximately of said weight.
• composition useful in the context of the present invention may further comprise at least one oxidation base.
• the oxidation base or bases may be selected from the oxidation bases conventionally used for oxidation dyeings, such as, for example, para-phenylenediamines, bisphenylalkylenediamines, para-aminophenols, ortho- aminophenols and heterocyclic bases and their addition salts with an acid or a base.
• para-phenylenediamines mention may be made more particularly, by way of example, of para- phenylenediamine, para-tolylenediamine, 2-chloro-para- phenylenediamine , 2 , 3 -dimethyl -para-phenylenediamine , 2 , 6 -dimethyl -para-phenylenediamine , 2 , 6 -diethyl -para- phenylenediamine , 2 , 5 -dimethyl -para-phenylenediamine , N, N-dimethyl -para-phenylenediamine, N, N-diethyl-para- phenylenediamine, N, N-dipropyl -para-phenylenediamine, 4 -amino-N, N-diethyl -3 -methylaniline, N, N-bis ( ⁇ -hydroxy- ethyl) -para-phenylenediamine, 4
• the bisphenylalkylenediamines mention may be made more particularly, by way of example, of N, N'- bis ( ⁇ -hydroxyethyl) -N,N' -bis (4 ' -aminophenyl) -1 , 3-diamino- propanol , N, N' -bis ( ⁇ -hydroxyethyl) -N, N' -bis (4 ' -aminophenyl) ethylenediamine, N, N' -bis (4 -aminophenyl) tetra- methylenediamine, N, N' -bis ( ⁇ -hydroxyethyl) -N, N' -bis (4- aminophenyl) tetramethylenediamine, N, N' -bis (4 -methyl- aminophenyl) tetramethylenediamine, N, N' -bis (ethyl) - N, N' -bis (4 ' -amino-3 ' -methylphen
• para-aminophenol mention may be made more particularly, by way of example, of para-aminophenol , 4 -amino-3 -methylphenol , 4-amino-3-fluorophenol , 4- amino-3-hydroxymethylphenol , 4 -amino-2 -methylphenol , 4- amino-2 -hydroxymethylphenol , 4-amino-2-methoxymethyl- phenol, 4 -amino-2 -aminomethylphenol , 4-amino-2- ( ⁇ - hydroxyethylaminomethyl) phenol , 4 -amino-2 -fluorophenol and their addition salts with an acid or a base.
• ortho-aminophenols mention may be made, for example, of 2-aminophenol, 2 -amino- 5 -methylphenol , 2- amino- 6 -methylphenol , 5-acetamido-2-aminophenol , and their addition salts with an acid or a base.
• heterocyclic bases mention may be made in particular of pyridine derivatives, pyrimidine derivatives and pyrazole derivatives and their addition salts with an acid or a base.
• the oxidation base or bases represent generally from 0.0005% to 12% by weight relative to the total weight of the composition, and preferably from 0.005% to 6% by weight relative to the total weight of the composition.
• composition useful in the context of the invention comprises one or more oxidation bases, it may also comprise at least one coupler so as to modify or enrich with glints the shades obtained employing the fluorescent dye or dyes and the oxidation base or bases .
• the couplers which can be used may be selected from the couplers used conventionally in this field, among which mention may be made in particular of meta- phenylenediamines, meta-aminophenols, meta-diphenols, heterocyclic couplers and their addition salts with an acid or a base.
• couplers are more particularly selected from 2- methyl-5-aminophenol , 5-N- ( ⁇ -hydroxyethyl) amino-2- methylphenol, 3-aminophenol , 1 , 3-dihydroxybenzene, 1,3- dihydroxy-2-methylbenzene, 4-chloro-l , 3-dihydroxy- benzene, 2 , 4-diamino-l- ( ⁇ -hydroxyethyloxy) benzene, 2- amino-4- ( ⁇ -hydroxyethylamino) -1-methoxybenzene, 1,3- diaminobenzene, 1, 3 -bis (2, 4 -diaminophenoxy) propane, sesamol, ⁇ -naphthol, 6 -hydroxyindole, 4 -hydroxyindole, 4-hydroxy-N-methylindole, 6 -hydroxyindoline, 2,6- dihydroxy-4-methylpyridine, lH-3-methylpyrazol-5-one, 1 -phenyl -3
• the coupler or couplers represent in general from 0.0001% to 10% by weight relative to the total weight of the composition, and more particularly from 0.005% to 5% by weight relative to the total weight of the composition.
• the addition salts with an acid that can be used in the context of the invention are selected in particular from hydrochlorides, hydrobromides, sulphates, citrates, succinates, tartrates, tosylates, benzenesulphonates, lactates and acetates .
• oxidation bases and couplers are selected in particular from the addition salts with alkali metals or alkaline earth metals, with aqueous ammonia, with organic amines, including alkanolamines, and the compounds of formula (III) .
• composition useful in the context of the present invention may include at least one oxidant.
• the oxidant is selected for example from hydrogen peroxide, urea peroxide, alkali metal bromates, persalts such as perborates and persulphates, and enzymes such as two-electron or four-electron oxidoreductases and peroxidases .
• the use of hydrogen peroxide or enzymes is particularly preferred.
• the amount of oxidant represents in general from 0.001% to 10% by weight relative to the total weight of the composition.
• composition useful in the context of the invention may further comprise various adjuvants which are conventionally used in the field of cosmetology, such as anionic, cationic, nonionic, amphoteric and zwitterionic surfactants or mixtures thereof, anionic, cationic, nonionic, amphoteric and zwitterionic polymers or mixtures thereof, organic or inorganic thickeners, and especially associative nonionic, anionic, cationic or amphoteric polymers, antioxidants, penetrants, sequestrants, perfumes, buffers, dispersants, conditioning agents such as cations, for example, cationic or amphoteric polymers, modified or non-modified, volatile or non-volatile silicones, chitosans or chitosan derivatives, film formers, ceramides, preservatives, stabilizers and opacifiers.
• adjuvants which are conventionally used in the field of cosmetology, such as anionic, cationic, nonionic,
• the adjuvants above are generally present each in an amount between 0.01% and 40% by weight relative to the weight of the composition, preferably between 0.1% and 20% by weight relative to the weight of the composition.
• the person skilled in the art will of course ensure that this or these optional additional compounds are selected such that the advantageous properties intrinsically attached to the composition are not, or not substantially, impaired by the addition or additions envisaged.
• composition useful in the context of the invention may take various forms, such as lotions, shampoos, creams, gels, pastes, or any other appropriate form.
• the method of dyeing, with lightening effect, keratin substances in accordance with the present invention is a method wherein a composition comprising, in a cosmetically acceptable medium, at least one fluorescent cyanine dye as defined above is applied to the keratin substances, this application being optionally followed by rinsing.
• composition applied to the keratin substances may comprise at least one additional fluorescent dye and/or at least one additional, non-fluorescent , direct dye, as have been defined above.
• composition applied to the keratin substances may also comprise at least one oxidation base and optionally at least one coupler, as have been defined above .
• composition applied to the keratin substances may be applied in the presence of at least one oxidant.
• the oxidant may be added to the composition useful in the context of the invention at the time of use, or it may be employed from an oxidizing composition containing it, which is applied simultaneously or sequentially to the dyeing composition.
• the oxidant is selected for example from hydrogen peroxide, urea peroxide, alkali metal bromates, persalts such as perborates and persulphates, and enzymes such as two-electron or four-electron oxidoreductases and peroxidases .
• the use of hydrogen peroxide or enzymes is particularly preferred.
• the time needed for the dyeing to develop and for the lightening effect to obtained on the keratin fibres is generally approximately 5 to 60 minutes and more particularly approximately 5 to 40 minutes.
• the temperature required for the development of the dyeing and the obtaining of the lightening effect on the keratin fibres is generally between ambient temperature (15 to 25 0 C) and 8O 0 C and more particularly between 15 and 4O 0 C.
• the present invention further provides a multi - compartment device which allows the method of dyeing with lightening effect, in accordance with the invention, to be implemented, when the dyeing composition is applied in the presence of an oxidant.
• the multi -compartment device of the invention contains in a first compartment a composition comprising, in a cosmetically acceptable medium, at least one fluorescent cyanine dye as defined above and optionally at least one additional fluorescent dye and/or at least one non- fluorescent direct dye and/or at least one oxidation base and/or at least one coupler as defined above and in a second compartment a composition comprising at least one oxidant.
• the multi -compartment device in accordance with the invention may be equipped with a means allowing the desired mixture to be delivered to the hair, such as the devices described in patent FR 2 586 913.
• the present invention further provides the fluorescent dyes of formulae (I) or (II) as defined above, with the exception of 4 , 4 '- ⁇ piperazine-1, 4-diylbis [4 , 1- phenyleneethene-2 , 1-diyl] ⁇ bis (1-methylpyridinium) bis (methyl sulphate) of formula:
• compositions for dyeing, with lightening effect, human keratin substances comprising, in a cosmetically acceptable medium, at least one fluorescent dye selected from fluorescent dyes of formulae (I) or (II) as defined above, with the exception of 4,4'- ⁇ piperazine-1 , 4-diylbis [4 , l-phenyleneethene-2 , 1-diyl] ⁇ - bis (1-methylpyridinium) bis (methyl sulphate) and of 4 , 4 ' - ⁇ 1 , 4-phenylenebis [methylene (ethylimino) -4,1- phenyleneethene-2 , 1-diyl] ⁇ bis (1-methylpyridinium) bis (methyl sulphate) , and their addition salts with an acid or a base.
• fluorescent dyes of formulae (I) or (II) as defined above, with the exception of 4,4'- ⁇ piperazine-1 , 4-diylbis [4 ,
• the present invention also provides a composition for dyeing, with lightening effect, human keratin substances, comprising, in a cosmetically acceptable medium, at least one fluorescent dye selected from the compounds of formulae (I) or (II) and their addition salts with an acid or a base as defined above and at least one additive selected from anionic, cationic, nonionic, amphoteric and zwitterionic surfactants and organic or inorganic thickeners, and especially nonionic, anionic, cationic or amphoteric associative polymers .
• the precipitate formed is filtered off and washed three times with 100 ml of isopropanol, and is dried under vacuum in the presence of P 2 O 5 . 9.63 g of red powder are harvested. Analyses confirm the nature of the expected product, particularly the results of 1 H NMR analysis (D 2 O) .
• compositions are prepared, i being 3 or
• the dyes are given below.
• compositions are applied to locks of natural brown hair with a tone level of 4 and to locks of natural 90% white hair, at a rate of 5 g of composition to 1 g of hair, at ambient temperature for 30 minutes.
• the locks are subsequently rinsed without shampoo, then dried under a hood for 30 minutes. The results obtained are given in the table below.
• a shampoo resistance test was carried out on the locks of hair dyed with dyes 3 and 6 obtained under the conditions described above.
• the dyed locks were subjected to 6 shampooings in a cycle which includes the wetting of the locks with water, washing with shampoos, rinsing with water and subsequent drying.
• compositions are prepared, i being 4 or
• the dyes are given below.
• compositions are applied to natural brown locks with a tone level of 4 and to locks of natural 90% white hair, at a rate of 5 g of composition to 1 g of hair, at ambient temperature for 30 minutes.
• the locks are subsequently rinsed without shampoo, then dried under a hood for 30 minutes.
• a shampoo resistance test was carried out on the locks of hair dyed with dyes 4 and 5 obtained under the conditions described above.
• the dyed locks were subjected to 6 shampooings in a cycle which includes the wetting of the locks with water, washing with shampoos, rinsing with water and subsequent drying.

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