Classifications

• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
  • C09B44/00—Azo dyes containing onium groups
  • C09B44/10—Azo dyes containing onium groups containing cyclammonium groups attached to an azo group by a carbon atom of the ring system
  • C09B44/16—1,3-Diazoles or hydrogenated 1,3-diazoles ; (Benz)imidazolium
• • 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
  • A61Q5/065—Preparations for temporary colouring the hair, e.g. direct dyes

Definitions

• the present invention relates to a method of colouring keratin-containing fibres using cationic imidazole dyes, to novel imidazole dyes and to a process for the preparation thereof.
• EP-A-714954 a cationic imidazolazo dye that is suitable for colouring hair and is obtained by diazotising 4-aIkoxyaniline, coupling with imidazole, then alkylating and quatemising, and finally reacting with p-phenylenediamine. That dye does not however, meet all the demands made in practice of such direct hair dyes, its stability in aqueous solution, in particular, being unsatisfactory.
• the present invention accordingly relates to a method of colouring keratin-containing fibres that comprises treating the fibres with a dye of formula
• Y . and Y 2 are each independently of the other hydrogen, unsubstituted or substituted C C 4 - alkyl, or halogen, Ri and R 2 are each independently of the other hydrogen or unsubstituted or substituted
• R 3 and R are each independently of the other hydrogen, unsubstituted or substituted C C - alkyl, C C alkoxy or halogen
• R 5 is hydrogen, C C 4 alkyl, C C 4 alkoxy or halogen
• X is C C ⁇ alkoxy or a group of formula -N(R 6 )-CO-R 7 , wherein R 6 is hydrogen or C- ⁇ -C 4 alkyl and R 7 is hydrogen, C C 4 alkyl or -NH 2 and A " is an anion.
• alkyl radicals are to be understood generally as open-chain or branched alkyl radicals, for example methyl, ethyl, n- and iso-propyl and n-, sec- and tert- butyl.
• alkyl radicals may be mono- or poly-substituted, for example by hydroxy, carboxy, halogen, cyano or C C 4 alkoxy.
• the alkoxy radicals may contain from 1 to 12 carbon atoms, preferably from 1 to 4 carbon atoms. They are, for example, methoxy, ethoxy, propoxy, isopropoxy, n-butoxy, isobutoxy , tert-butoxy, n-pentyloxy or n-hexyloxy.
• the alkoxy groups may be substituted, for example by the radicals mentioned as possible substituents for the alkyl groups, especially by hydroxy or C O ⁇ alkoxy.
• anion A both inorganic and organic anions, for example halide, such as chloride, bromide or iodide, sulfate, hydrogen sulfate, methyl sulfate, boron tetrafluoride, aminosulfonate, perchlorate, carbonate, bicarbonate, phosphate, nitrate, benzenesulfonate, formate, acetate, propionate, lactate, and complex anions, such as an anion of a zinc chloride double salt.
• halide such as chloride, bromide or iodide
• sulfate hydrogen sulfate, methyl sulfate, boron tetrafluoride
• aminosulfonate perchlorate
• carbonate bicarbonate
• phosphate nitrate
• benzenesulfonate formate
• acetate propionate
• lactate complex anions
• the anion is generally governed by the preparation procedure.
• chlorides, hydrogen sulfates, sulfates, methosulfates, phosphates, formates, lactates or acetates are present.
• Halogen is to be understood as fluorine, bromine or iodine or, especially, chlorine.
• Each of Y., and Y 2 is preferably methyl and especially hydrogen.
• Each of R-, and R 2 is preferably ethyl, hydroxyethyl or methyl.
• R 3 and R are preferably methoxy, methyl, hydrogen or chlorine.
• R 5 is hydrogen
• X is preferably unsubstituted C C 4 alkoxy or a radical -NH-CO-R 7 , wherein R 7 is especially hydrogen, methyl, ethyl or -NH 2 .
• R-i and R 2 are each methyl or ethyl
• X is unsubstituted C C 4 alkoxy or a radical -NH-CO-R 7 , wherein R 7 is hydrogen, methyl, ethyl or -NH 2 and : j
• a ' is an anion
• the dyes of formula (2) are novel and the invention relates also thereto.
• the dyes of formulae (1) and (2) are prepared, for example, by acylating the free amino group in a compound of formula wherein Y 1f Y 2 , R-,, R 2 , R 3 , R 4 , R 5 and A " are as defined for formula (1), in a manner known perse. This is carried out, for example, by reaction with an appropriate acid, for example formic acid or acetic actd, an anhydride, for example acetic anhydride, or KOCN.
• Y 1 ? Y 2 , Ri, R 2 , R 3 and R 4 are as defined for formula (1) and R 8 is C C 4 alkyl, with a p-alkoxy-aniline under reaction conditions known per se.
• the dyes of formulae (1) and (2) are suitable for colouring keratin-containing fibres.
• "Keratin- containing fibres” are to be understood as wool, furs, feathers and, especially, human hair.
• the present invention relates also to compositions comprising such dyes for colouring keratin-containing fibres.
• the compounds of formulae (1) and (2) are present in the compositions according to the invention preferably in an amount of from 0.001 % to 5 %, especially from 0.01 % to 1 %, based on the total dyeing composition.
• the multiplicity of shades and the colour fastness of the dyes of formulae (1) and (2) used in accordance with the invention can be increased by combination with other dyes used in the field of hair-dyeing compositions. They can be combined very readily both with oxidation dyes and with direct dyes, it being possible for the latter to be of cationic nature or also uncharged. Only in the case of anionic direct dyes is a certain degree of caution required, since precipitation may occur in the formulation under certain circumstances.
• the joint use of a plurality of different dyeing substances is also possible; similarly possible is the joint use of a plurality of different oxidation dye precursors from the group of the developer and coupler compounds, for example aromatic compounds having a primary or secondary amino group, nitrogen-containing heterocycles, aromatic hydroxy compounds or amino acids, as described, for example, in German Patent Application 19 717224.5, especially page 3, line 31 to page 5, line 8.
• the dyes of formulae (1) and (2) according to the invention produce colour shades in the range from reddish-violet to violet, and the fastness properties are excellent. Attention is drawn to the property thereof that allows hair that is already dark in colour still to be distinctly altered in shade.
• dyes of formula (1) for colouring hair there are preferably used dyes of formula (1) in admixture with one or more further cationic dyes, especially those described in particular on pages 11 to 27 of WO 95/01772.
• dye mixtures comprising a dye of formula (1), and also the yellow dye according to Example 1 and/or the red dye according to Example 4 and/or the orange dye according to Example 46 of WO 95/1772.
• the dyeing compositions according to the invention comprise, in addition to the dyes of formula (1) according to the invention, customary direct dyes, for example from the group of the nitroanilines, nitrophenylenediamines, nitroaminophenols, anthraquinones, indophenols, phenazines, phenothiazines, methines or the compounds known as Arianors, such as, for example, the compounds known by the international names or trade names HC Yellow 2, HC Yellow 4, HC Yellow 6, Basic Yellow 57, Basic Yellow 9, Disperse Orange 3, HC Red 3, HC Red BN, Basic Red 76, Basic Red 2, Basic Violet 14, Basic Blue 3, Basic Blue 6, Basic Blue 7, Basic Blue 9, Basic Blue 12, Basic Blue 26, HC Blue 2, HC Blue 7, HC Blue 12, Disperse Blue 3, Basic Blue 99, HC Violet 1, Disperse Violet 1, Disperse Violet 4, Disperse Black 9, Basic Brown 16 und Basic Brown 17, and also picramic acid, 2-amino-6
• cationised nitroaniline and anthraquinone dyes for example those described in the following patent specifications: US-5 298 029, especially in column 2, line 33 to column 5, line 38; US-5360930, especially in column 2, line 38 to column 5, line 49; US-5 169403, especially in column 2, line 30 to column 5, line 38; US-5 256 823, especially in column 4, line 23 to column 5, line 15; US-5 135 543, especially in column 4, line 24 to column 5, line 16; EP-A-818 193, especially on page 2, line 40 to page 3, line 26; US-5486629, especially in column 2, line 34 to column 5, line 29; and EP-A-758547, especially on page 7, line 48 to page 8, line 19.
• cationic azo dyes e.g. according to GB-A-2 319776, as well as the oxazine dyes described in DE-A-29 912 327 and mixtures thereof with the other direct dyes mentioned therein, can likewise readily be combined.
• compositions of the invention according to this embodiment contain the dyes preferably in an amount of from 0.01 to 5 % by weight, based on the total dyeing composition.
• the dyeing compositions according to the invention may also contain naturally occurring dyes, such as, for example, henna red, henna neutral, henna black, camomile blossom, sandalwood, black tea, Rhamnus frangula bark, sage, campeche wood, madder root, catechu, sedre and alkanet root.
• Naturally occurring dyes such as, for example, henna red, henna neutral, henna black, camomile blossom, sandalwood, black tea, Rhamnus frangula bark, sage, campeche wood, madder root, catechu, sedre and alkanet root.
• Naturally occurring dyes such as, for example, henna red, henna neutral, henna black, camomile blossom, sandalwood, black tea, Rhamnus frangula bark, sage, campeche wood, madder root, catechu, sedre and alkanet root.
• Such colouring methods are described, for example, in EP-
• oxidation dye precursors optionally present or for the dyes each to be single compounds, but rather there may be present in the dyeing compositions according to the invention in addition, in lesser amounts, further components associated with the preparation procedures for the individual dyes, provided such components do not have an adverse effect on the dyeing result or do not need to be excluded for other, for example toxicological, reasons.
• the dyes of formula (1) according to the invention may also readily be used in combination with other dyes and/or adjuvants used in the colouring of hair, for example with
• EP-A-850636 especially page 5, line 41 to page 7, line 52, EP-A-850637, especially page 6, line 50 to page 8, line 44, EP-A-850 638, especially page 7, line 20 to page 9, line 26, and EP-A-852 135, especially page 4, line 54 to page 6, line 53,
• anionic surfactants as described in WO 00/10518, especially page 45, line 11 to page 48, line 3,
• non-ionic surfactants as described in WO 00/10519, especially page 45, line 11 to page 50, line 12, or
• silicones as described in WO 00/12057, especially page 45, line 9 to page 55, line 2.
• the dyeing compositions according to the invention result in intense colourations even at physiologically tolerable temperatures of less than 45°C. They are accordingly suitable especially for colouring human hair.
• the dyeing compositions can usually be incorporated into an aqueous cosmetic carrier.
• Suitable aqueous cosmetic carriers include, for example, creams, emulsions, gels and also surfactant-containing foaming solutions, e.g. shampoos or other preparations, that are suitable for use on keratin- containing fibres. Such forms of use are described in detail in Research Disclosure 42448 (August 1999).
• the dyeing compositions are also excellently suitable for the colouring method described in DE-A-3829 870 using a colouring comb or a colouring brush.
• the dyeing compositions according to the invention may furthermore comprise any active ingredient, additive or adjuvant known for such preparations.
• the dyeing compositions in many cases comprise at least one surfactant, there being suitable in principle anionic and also zwitterionic, ampholytic, non-ionic and cationic surfactants. In many cases, however, it has proved advantageous to select the surfactants from anionic, zwitterionic and non-ionic surfactants.
• Anionic surfactants suitable for use in the preparations according to the invention include all anionic surface-active substances that are suitable for use on the human body. Such substances are characterised by an anionic group that imparts water solubility, for example a carboxylate, sulfate, sulfonate or phosphate group, and a lipophilic alkyl group having approximately from 10 to 22 carbon atoms. In addition, glycol or polyglycol ether groups, ester, ether and amide groups and also hydroxy groups may be present in the molecule.
• suitable anionic surfactants each in the form of sodium, potassium or ammonium salts or mono-, di- or tri-alkanolammonium salts having 2 or 3 carbon atoms in the alkanol group:
• esters of tartaric acid and citric acid with alcohols which are addition products of approximately from 2 to 15 molecules of ethylene oxide and/or propylene oxide with fatty alcohols having from 8 to 22 carbon atoms.
• Preferred anionic surfactants are alkyl sulfates, alkyl polyglycol ether sulfates and ether carboxylic acids having from 10 to 18 carbon atoms in the alkyl group and up to 12 glycol ether groups in the molecule, and also especially salts of saturated and especially unsaturated C 8 -C 22 carboxylic acids, such as oleic acid, stearic acid, isostearic acid and palmitic acid.
• Zwitterionic surfactants that carry at least one quaternary ammonium group and at least one -COO (_) or SO ⁇ group in the molecule are termed zwitterionic surfactants.
• Zwitterionic surfactants that are especially suitable are the so-called betaines, such as the N-alkyl- N,N-dimethylammonium glycinates, for example cocoalkyldimethylammonium glycinate, N-acylaminopropyl-N,N-dimethylammonium glycinates, for example cocoacylaminopropyl- dimethylammonium glycinate, and 2-alkyl-3-carboxymethyl-3-hydroxyethylimidazolines having from 8 to 18 carbon atoms in the alkyl or acyl group and also cocoacylaminoethylhydroxyethylcarboxymethyl glycinate.
• a preferred zwitterionic surfactant is the fatty acid amide derivative known by the
• Ampholytic surfactants are to be understood as meaning surface-active compounds that, in addition to a C 8 -C 18 -alkyl or -acyl group, contain at least one free amino group and at least one -COOH or -SO 3 H group in the molecule and are capable of forming internal salts.
• ampholytic surfactants include N-alkylglycines, N-alkylpropionic acids, N-alkylaminobutyric acids, N-alkyliminodipropionic acids, N-hydroxyethyl-N-alkylamido- propylglycines, N-alkyltaurines, N-alkylsarcosines, 2-alkylaminopropionic acids and alkylaminoacetic acids, each having approximately from 8 to 18 carbon atoms in the alkyl group.
• Ampholytic surfactants to which special preference is given are N-cocoalkyl- aminopropionate, cocoacylaminoethylaminopropionate and C ⁇ 2 -C 18 acylsarcosine.
• Non-ionic surfactants contain as the hydrophilic group, for example, a polyol group, a polyalkylene glycol ether group or a combination of polyol and polyglycol ether groups.
• Such compounds are, for example:
• ammonium halides such as alkyltrimethylammonium chlorides, dialkyldimethyl- ammonium chlorides and trialkylmethylammonium chlorides, for example cetyltrimethyl- ammonium chloride, stearyltrimethylammonium chloride, distearyldimethylammonium chloride, lauryldimethylammonium chloride, lauryldimethylbenzylammonium chloride and tricetylmethylammonium chloride.
• Further cationic surfactants that can be used in accordance with the invention are quaternised protein hydrolysates.
• cationic silicone oils such as, for example, the commercially available products Q2-7224 (manufacturer: Dow Corning; a stabilised trimethylsilylamodimethicone), Dow Corning 929 emulsion (comprising a hydroxylamino- modified silicone, which is also referred to as amodimethicone), SM-2059 (manufacturer: General Electric), SLM-55067 (manufacturer: Wacker) and also Abil ® -Quat 3270 and 3272 (manufacturer: Th. Goldschmidt; diquaternary polydimethylsiloxanes, quaternium-80).
• Alkylamidoamines especially fatty acid amidoamines, such as the stearylamidopropyl- dimethylamine obtainable under the name Tego Amid ® 18, are distinguished not only by a good conditioning action but also especially by their good biodegradability
• estersquats such as the methyl hydroxyalkyl- dialkoyloxyalkylammonium methosulfates marketed under the trade mark Stepantex ® , are also very readily biodegradable.
• quaternary sugar derivative that can be used as cationic surfactant is the commercial product Glucquat ® 100, according to CTFA nomenclature a "lauryl methyl gluceth-10 hydroxypropyl dimonium chloride".
• the alkyl-group-containing compounds used as surfactants may be single substances, but the use of natural raw materials of vegetable or animal origin is generally preferred in the preparation of such substances, with the result that the substance mixtures obtained have different alkyl chain lengths according to the particular starting material used.
• the surfactants that are addition products of ethylene and/or propylene oxide with fatty alcohols or derivatives of such addition products may either be products having a "normal” homologue distribution or products having a restricted homologue distribution.
• "Normal” homologue distribution is to be understood as meaning mixtures of homologues obtained in the reaction of fatty alcohol and alkylene oxide using alkali metals, alkali metal hydroxides or alkali metal alcoholates as catalysts.
• Restricted homologue distributions are obtained when, for example, hydrotalcites, alkali metal salts of ether carboxylic acids, alkali metal oxides, hydroxides or alcoholates are used as catalysts.
• the use of products having restricted homologue distribution may be preferred.
• non-ionic polymers for example vinylpyrrolidone/vinyl acrylate copopylmers, polyvinyl- pyrro ⁇ done and vinylpyrrolidone/vinyl acetate copolymers and polysiloxanes,
• - cationic polymers such as quatemised cellulose ethers, polysiloxanes having quaternary groups, dimethyldiallylammonium chloride polymers, copolymers of dimethyldiallylammonium chloride and acrylic acid, as available commercially under the name Merquat R 280 and the use of which in hair colouring is described, for example, in DE-A-4421 031, especially page 2, lines 20 to 49, or EP-A-953 334, especially page 27, line 17 to page 30, line 11, acrylamide/dimethyldiallylammonium chloride copolymers, diethyl-sulfate-quaternised dimethylaminoethyl methacrylate/vinylpyrrolidone copolymers, vinylpyrrolidone/imidazolinium methochloride copolymers,
• - zwitterionic and amphoteric polymers such as, for example, acrylamidopropyl-trimethylammonium chloride/acrylate copolymers and octylacrylamide/- methyl methacrylate/tert-butylaminoethyl methacrylate/2-hydroxypropyl methacrylate copolymers
• - anionic polymers such as, for example, polyacrylic acids, crosslinked polyacrylic acids, vinyl acetate/crotonic acid copolymers, vinylpyrrolidone/vinyl acrylate copolymers, vinyl acetate/butyl maleate/isobornyl acrylate copolymers, methyl vinyl ether/maleic anhydride copolymers and acrylic acid/ethyl acrylate/N-tert-butyl acrylamide terpolymers,
• - thickeners such as agar, guar gum, alginates, xanthan gum, gum arabic, karaya gum, locust bean flour, linseed gums, dextrans, cellulose derivatives, e.g. methyl cellulose, hydroxyalkyl cellulose and carboxymethyl cellulose, starch fractions and derivatives, such amylose, amylopectin and dextrins, clays, e.g. bentonite or fully synthetic hydrocolloids such as, for example, polyvinyl alcohol,
• - hair-conditioning compounds such as phospholipids, for example soya lecithin, egg lecithin, and cephalins, silicone oils, and also conditioning compounds, for example such as those described in DE-A-19 729 080, especially page 2, lines 20 to 49, EP-A-834 303, especially page 2, line 18 to page 3, line 2, or EP-A-312343, especially page 2, line 59 to page 3, line 11 ,
• - protein hydrolysates especially elastin, collagen, keratin, milk protein, soya protein and wheat protein hydrolysates, condensation products thereof with fatty acids and also quatemised protein hydrolysates,
• solubilisers such as ethanol, isopropanol, ethylene glycol, propylene glycol, glycerol and diethylene glycol,
• anti-dandruff active ingredients such as piroctones, olamines and zinc Omadine
• spermaceti such as spermaceti, beeswax, montan wax, paraffins, fatty alcohols and fatty acid esters,
• - swelling and penetration substances such as polyols and polyol ethers, as listed extensively, for example, in EP-A-962219, especially page 27, lines 18 to 38, for example glycerol, propylene glycol, propylene glycol monoethyl ether, butyl glycol, benzyl alcohol, carbonates, hydrogen carbonates, guanidines, ureas and also primary, secondary and tertiary phosphates, imidazoles, tannins, pyrrole,
• polyols and polyol ethers as listed extensively, for example, in EP-A-962219, especially page 27, lines 18 to 38, for example glycerol, propylene glycol, propylene glycol monoethyl ether, butyl glycol, benzyl alcohol, carbonates, hydrogen carbonates, guanidines, ureas and also primary, secondary and tertiary phosphates, imidazoles, tannins, pyrrole,
• - pearlising agents such as ethylene glycol mono- and di-stearate
• propellants such as propane-butane mixtures, N 2 O, dimethyl ether, CO 2 and air, and also
• constituents of the aqueous carrier are used in the preparation of the dyeing compositions according to the invention in the amounts customary for that purpose; for example emulsifiers are used in concentrations of from 0.5 to 30 % by weight and thickeners in concentrations of from 0.1 to 25 % by weight of the total dyeing composition.
• the pH value of the ready-to-use dyeing preparations are usually from 2 to 11 , preferably from 5 to 10.
• the dyeing compositions are usually applied to the hair in an amount of from 50 to 100 g in the form of the aqueous cosmetic carrier, left there for approximately 30 minutes and then rinsed off or washed off with a commercially available hair shampoo.
• the dyes used according to the invention and the optionally used oxidation dye precursors may be applied to the keratin-containing fibres either simultaneously or in succession, the order in which they are applied being unimportant.
• the dyes used according to the invention and the optionally used oxidation dye precursors of the compositions according to the invention may be stored separately or together, either in a liquid to paste-like preparation (aqueous or non-aqueous) or in the form of a dry powder.
• a liquid to paste-like preparation aqueous or non-aqueous
• the preparation should be substantially anhydrous in order to reduce reaction of the components.
• the reactive components are intimately mixed with one another only immediately before use. In the case of dry storage, before use a defined amount of hot (from 50 to 80°C) water is usually added and a homogeneous mixure prepared.
• the dye colours bleached yak hair a brilliant red-tinged violet.
• the residue is dissolved hot in 12 litres of methanol and the solution is clarified by way of a preheated pressurised suction filter.
• the filtrate is concentrated to approximately 2 litres using a rotary evaporator, the dye precipitating in pure form.
• the dye colours bleached yak hair a brilliant violet, the shade of which is slightly less red-tinged than that of the formyl-substituted dye of Example 2.
• Example 4 13 g of p-anisidine are dissolved at approximately 50°C in 45 g of dimethyl- formamide in a suitable stirring apparatus. Then, with stirring, 26.7 g of the compound of formula
• reaction mixture is diluted with a further 50 g of dimethyl- formamide, allowed to cool slightly and filtered at approximately 40°C.
• the crystalline filter cake is washed with a further 50 g of DMF in portions, and finally thoroughly suction-filtered dry.
• the filter cake is suspended in 80 g of water and stirred for 2 hours at a temperature of from 70 to 75°C. After cooling with stirring, filtration is carried out, followed by washing with a total of 50 g of water, in portions, and drying. 22 g of the dye of formula
• the dye colours bleached yak hair a brilliant red-tinged violet.
• Example 5 A 10 % solution of a non-ionic surfactant (Plantaren® 2000 [Henkel]) is adjusted to pH 9.5 using citric acid. 0.06 % of the dye from Example 1 are dissolved therein. A 1 g strand of undamaged human hair ("Italian white virgin", Imhair Ltd) is treated for 20 minutes at room temperature with 2 g of the dye solution and then rinsed and shampooed. A very attractive violet colouration is obtained, which even after washing eight times can still be seen clearly. The fastness to light of the colouration is excellent.
• a non-ionic surfactant Planten® 2000 [Henkel]
• Example 6 A 10 % solution of a non-ionic surfactant (Plantaren® 2000 [Henkel]) is adjusted to pH 5.5 using citric acid. The following dyes are dissolved in 100 g of that solution: 0.20 g of the yellow dye according to Example 1 in WO 95/01772 0.05 g of the dye according to the invention from Example 4 of the present Application.
• a non-ionic surfactant Planten® 2000 [Henkel]
• a 1 g strand of undamaged human hair ("Italian white virgin", Imhair Ltd) is treated for 20 minutes at room temperature with 2 g of the above dye solution and then rinsed and shampooed.
• a very attractive copper colouration having excellent fastness to washing, rubbing and light is obtained.
• Example 7 A 10 % solution of a non-ionic surfactant (Plantaren® 2000 [Henkel]) is adjusted to pH 5.5 using citric acid. The following dyes are dissolved in 100 g of that solution:
• a strand of bleached human hair is treated for 20 minutes at room temperature with double the amount thereof of the above dyeing solution, and is then rinsed and shampooed once. A black colouration having good fastness to washing and rubbing is obtained.
• Example 8 The following cationic emulsion base is prepared:
• Example 9 A 10 % solution of a non-ionic surfactant (Plantaren R 2000 [Henkel]) is adjusted to pH 5.5 using citric acid. The following dyes are dissolved in 100 g of that solution:
• Example 10 The following dyes are dissolved in 100 g of a solution of a non-ionic surfactant as described in Example 5 (pH 9.5):
• a strand of white, undamaged hair is treated for 20 minutes at room temperature with the above solution.
• the result is a light-brown colouration with an attractive copper tinge.
• Example 11 The procedure is as in Example 10, except that the dyes specified are replaced by
• the result on the white hair is a very attractive, intensely ruby-red colouration having excellent fastness properties.

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• 2001
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