Patent Application
20070067923
The present invention relates to agents for the dyeing of keratin fibers based on a developer substance-coupler substance combination which comprise 1,3-diaminobenzene derivatives as coupler substance, and to novel 1,3-diaminobenzene derivatives.
In the field of dyeing keratin fibers, in particular hair coloring, oxidation dyes have achieved significant importance. The coloration arises here as a result of the reaction of certain developer substances with certain coupler substances in the presence of a suitable oxidizing agent. The developer substances used here are, in particular, 2,5-diaminotoluene, 2,5-diaminophenylethyl alcohol, p-aminophenol and 1,4-diaminobenzene, while examples of coupler substances are resorcinol, 4-chlororesorcinol, 1-naphthol, 3-aminophenol, and derivatives of m-phenylenediamine.
Besides dyeing to the desired intensity, numerous additional requirements are placed on oxidation dyes which are used for coloring human hair. For example, the dyes must be acceptable from a toxicological and dermatological point of view and the hair colorations achieved must have good light fastness, permanent wave fastness, acid fastness, and rubbing fastness. However, in any case, such colorations must remain stable over a period of at least 4 to 6 weeks without being affected by light, rubbing, and chemical agents. Furthermore, it is required that, by combining suitable developer substances and coupler substances, a broad palette of different color nuances can be produced.
Using the currently used colorants, as are described, for example, in the monograph by K. H. Schrader “Grundlagen und Rezepturen der Kosmetika” [Fundamentals and formulations of cosmetics], 2nd edition (1989), pages 784-799, it is, however, not possible to satisfy the above mentioned requirements in all aspects. Therefore there is still a need for novel coupler substances which satisfy the above mentioned requirements to a particular degree.
In this regard, it has now surprisingly been found that certain 1,3-diamino-benzene derivatives according to the general formula (I) satisfy the requirements placed on coupler substances to a particularly high degree. Thus, when these coupler substances are used with most known developer substances, color-rich shades are obtained which are extraordinarily resistant against shampooing and rubbing.
The present invention therefore relates to new 1,3-diaminobenzene derivatives of the formula (I) and the physiologically tolerated water-soluble salts thereof
in which
Preference is given to compounds of the formula (I) in which R3 is hydrogen.
Compounds of the formula (I) which may be mentioned are, for example, the following compounds:
The 1,3-diaminobenzene derivatives of the formula (I) according to the invention can be prepared using known synthesis methods. The synthesis of the compounds according to the invention can, for example, be carried out as follows: either a) by a one-carbon elongation of 2,4-dinitrobenzaldehyde via its dibromoalkene derivative (II), in analogy to the method described in Tetrahedron 58 (2002), pages 9925-9932, and final reduction of the nitro groups of the acetamide derivative of formula (III), according to Diagram 1,
or b) by amide formation starting from the phenylacetic acid derivative (IV) using known coupling conditions, and final reduction and deprotection (when X stands for a protected amino group) of the acetamide derivative of formula (V), according to Diagram 2.
The compounds of the formula (I) can be used either in the form of free bases or else in the form of their physiologically compatible salts with inorganic or organic acids, such as, for example, hydrochloric acid, sulfuric acid, phosphoric acid, acetic acid, propionic acid, lactic acid, or citric acid.
Another object of the present invention is an agent for the oxidative dyeing of keratin fibers, such as, for example, hair, furs, feathers, or wool, in particular human hair, based on a developer substance-coupler substance combination which comprises (as coupler substance) at least one 1,3-diaminobenzene derivative of the above mentioned formula (I) or the physiologically compatible, water-soluble salts thereof.
The 1,3-diaminobenzene derivatives of the formula (I) according to the invention are readily soluble in water and permit colorations with high color intensity and excellent color fastness, especially with regard to washing fastness and rubbing fastness. The 1,3-diaminobenzene derivatives of the formula (I) also have excellent storage stability, especially as constituent of the colorants described above.
The 1,3-diaminobenzene derivatives of the formula (I) are present in the colorant according to the invention in a total amount of from about 0.005% to 20% by weight, preference being given to an amount of from about 0.01% to 8% by weight and in particular 0.1% to 5% by weight.
Suitable developer substances are 1,4-diaminobenzene (p-phenylenediamine), 1,4-diamino-2-methylbenzene (p-toluylenediamine), 1,4-diamino-2,6-dimethylbenzene, 1,4-diamino-3,5-diethylbenzene,
Furthermore, in addition to the compounds of the formula (I), the colorant according to the invention can also comprise further known coupler substances, for example N-(3-dimethylaminophenyl)urea, 2,6-diaminopyridine, 2-amino-4-[(2-hydroxyethyl)amino]anisole, 2,4-diamino-1-fluoro-5-methylbenzene, 2,4-diamino-1-methoxy-5-methylbenzene, 2,4-diamino-1-ethoxy-5-methylbenzene, 2,4-diamino-1-(2-hydroxyethoxy)-5-methylbenzene, 2,4-di[(2-hydroxyethyl)amino]-1,5-dimethoxybenzene,
The additional coupler substances and developer substances may be present in the colorant according to the invention in each case individually or in the mixture with one another, where the total amount of coupler substances and developer substances in the colorant according to the invention (based on the total amount of the colorant) is in each case about 0.005% to 20% by weight, preferably about 0.01% to 10% by weight and in particular 0.1% to 5% by weight.
The total amount of the developer substance-coupler substance combination present in the colorant according to the invention is preferably about 0.01% to 20% by weight, particularly preferred is an amount of from about 0.02% to 15% by weight and especially 0.2% to 10% by. weight. The developer substances and coupler substances are generally used in approximately equimolar amounts; however, it is not disadvantageous if the developer substances are present in this regard in a certain excess or deficit.
In addition, the colorant according to the invention can additionally comprise other color components, for example 6-amino-2-methylphenol and 2-amino-5-methylphenol, and also customary natural, nature-identical or synthetic direct dyes, for example triphenylmethane dyes, such as
The coupler substances and developer substances and also the other color components, if they are bases, can of course also be used in the form of the physiologically compatible salts with organic or inorganic acids, such as, for example, hydrochloric acid, sulfuric acid, or phosphoric acid, or—if they have aromatic OH groups—in the form of these salts with bases, for example as alkali metal phenoxides.
Moreover, if the colorants are to be used for dyeing hair, they may also comprise further customary cosmetic additives, for example antioxidants, such as ascorbic acid, thioglycolic acid, and sodium sulfite, and perfume oils, complexing agents, wetting agents, emulsifiers, thickeners, and care substances. The preparation form of the colorant according to the invention can, for example, be a solution, in particular an aqueous or aqueous-alcoholic solution. The particularly preferred preparation forms are, however, a cream, a gel, or an emulsion. Their composition is a mixture of the dye components with the additives customary for such preparations.
Customary additives in solutions, creams, emulsions, or gels are, for example, solvents, such as water, lower aliphatic alcohols, for example ethanol, propanol or isopropanol, glycerol or glycols, such as 1,2-propylene glycol, and also wetting agents or emulsifiers from the classes of anionic, cationic, amphoteric, or nonionogenic surface-active substances, such as, for example, fatty alcohol sulfates, oxyethylated fatty alcohol sulfates, alkylsulfonates, alkylbenzenesulfonates, alkyltrimethylammonium salts, alkylbetaines, oxyethylated fatty alcohols, oxyethylated nonylphenols, fatty acid alkanolamides, and oxyethylated fatty acid esters, also thickeners, such as higher fatty alcohols, starch, cellulose derivatives, petrolatum, paraffin oil, and fatty acids, and also care substances, such as cationic resins, lanolin derivatives, cholesterol, pantothenic acid, and betaine. The constituents mentioned are used in the amounts customary for such purposes, for example the wetting agents and emulsifiers in concentrations of from about 0.5% to 30% by weight, the thickeners in an amount of from about 0.1% to 25% by weight, and the care substances in a concentration of from about 0. 1% to 5% by weight.
Depending on the composition, the colorant of the invention can be weakly acidic, neutral or alkaline. In particular, it has a pH from 6.8 to 11.5.
According to the present invention for pH adjustment in the alkaline range the composition may further optionally comprise at least one source of alkalizing agent, preferably a source of ammonium ions and or ammonia. Any agent known in the art may be used such as alkanolamides, for example, monoethanolamine, diethanolamine, triethanolamine, monopropanolamine, dipropanolamine, tripropanolamine, 2-amino-2-methyl-1,3-propanediol, 2-amino-2-methyl-1-propanol, and 2-amino-2-hydroxymethyl-1,3-propanediol and guanidium salts. Particularly, preferred alkalizing agents are those which provide a source of ammonium ions. Any source of ammonium ions is suitable for use herein. Preferred sources include ammonium chloride, ammonium sulphate, ammonium nitrate, ammonium phosphate, ammonium acetate, ammonium carbonate, ammonium hydrogen carbonate, ammonium carbamate, ammonium hydroxide, percarbonate salts, ammonia and mixtures thereof. Particularly preferred are ammonium carbonate, ammonium carbamate, ammonium hydrogen carbonate, ammonia, and mixtures thereof, or a mixture of ammonia and organic amines (particularly monoethanolamine or triethanolamine). The compositions of the present invention may comprise from about 0.1% to about 10% by weight, preferably from about 0.5% to about 5%, most preferably from about 1% to about 3% of an alkalizing agent, preferably ammonium ions.
For pH adjustment in the acidic range, an inorganic or organic acid, for example phosphoric acid, acetic acid, citric acid, or tartaric acid, may be used.
The compositions according to the present invention may comprise at least one source of an oxidizing agent for developing the hair color. Preferred oxidizing agents for use herein are water-soluble peroxygen oxidizing agents. “Water-soluble” as defined herein means that in standard condition at least 0.1 g, preferably 1 g, more preferably 10 g of said oxidizing agent can be dissolved in 1 liter of deionized water. The oxidizing agents are valuable for the initial solubilization and decolourization of the melanin (bleaching) and accelerate the oxidation of the oxidative dye precursors (oxidative dyeing) in the hair shaft.
Any oxidizing agent known in the art may be utilized in the present invention. Preferred water-soluble oxidizing agents are inorganic peroxygen materials capable of yielding hydrogen peroxide in an aqueous solution. Water-soluble peroxygen oxidizing agents are well known in the art and include hydrogen peroxide, inorganic alkali metal peroxides such as sodium periodate and sodium peroxide and organic peroxides such as urea peroxide, melamine peroxide, and inorganic perhydrate salt bleaching compounds, such as the alkali metal salts of perborates, percarbonates, perphosphates, persilicates, persulphates, and the like. These inorganic perhydrate salts may be incorporated as monohydrates, tetrahydrates, etc. Alkyl and aryl peroxides, and/or peroxidases may also be used. Mixtures of two or more such oxidizing agents can also be used if desired. The oxidizing agents may be provided in aqueous solution or as a powder which is dissolved prior to use. Preferred for use in the compositions according to the present invention are hydrogen peroxide, percarbonate, persulphates, and combinations thereof.
According to the present invention the compositions comprise from about 0.1% to about 15% by weight, preferably from about 1% to about 10% by weight, and most preferably from about 2% to about 7% by weight of an oxidizing agent.
Another preferred oxidizing agent for use herein is a source of peroxymonocarbonate ions. Preferably such a source is formed in situ from a source of hydrogen peroxide and a hydrogen carbonate ion source. Such an oxidizing agent has been found to be particularly effective at a pH of up to and including 9.5, preferably 7.5 to 9.5 more preferably about pH 9. Moreover, this system is also particularly effective in combination with a source of ammonia or ammonium ions. It has been found that this oxidizing agent can deliver improvements to the desired hair color results particularly with regard to the delivery of high lift, while considerably reducing the odor, skin and scalp irritation, and damage to the hair fibers.
Accordingly, any source of these ions may be utilized. Suitable sources for use herein include sodium, potassium, guanidine, arginine, lithium, calcium, magnesium, barium, ammonium salts of carbonate, carbamate and hydrocarbonate ions, and mixtures thereof, such as sodium carbonate, sodium hydrogen carbonate, potassium carbonate, potassium hydrogen carbonate, guanidine carbonate, guanidine hydrogen carbonate, lithium carbonate, calcium carbonate, magnesium carbonate, barium carbonate, ammonium carbonate, ammonium hydrogen carbonate, and mixtures thereof. Percarbonate salts may also be utilized to provide both the source of carbonate ions and oxidizing agent. Preferred sources of carbonate ions, carbamate, and hydrocarbonate ions are sodium hydrogen carbonate, potassium hydrogen carbonate, ammonium carbamate, and mixtures thereof.
According to the present invention the compositions comprise from about 0.1% to about 15% by weight, preferably from about 1% to about 10% by weight, and most preferably from about 1% to about 8% by weight of a hydrogencarbonate ion; and from about 0.1% to about 10% by weight, preferably from about 1% to about 7% by weight, and most preferably from about 2% to about 5% by weight of a source of hydrogen peroxide.
Especially preferred oxidants for developing the hair color are mainly hydrogen peroxide or a compound of addition of hydrogen peroxide to urea, melamine, sodium borate, or sodium carbonate, in the form of a 3 to 12%, preferably 6%, aqueous solution, as well as air oxygen. When a 6% hydrogen peroxide solution is used as the oxidant, the weight ratio of hair colorant to oxidant is 5:1 to 2:1, and preferably 1:1. Larger amounts of oxidant are used primarily when the hair colorant contains a higher dye concentration or when stronger hair bleaching is desired at the same time.
According to the present invention the compositions may further comprise a source of radical scavenger. As used herein, the term “radical scavenger,” refers to a species that can react with a reactive radical, preferably carbonate radicals, to convert the reactive radical by a series of fast reactions to a less reactive species. Suitable radical scavengers for use herein include compounds according to the general formula (I):
R1—Y—C(H)(R3)—R4—(C(H)(R5)—Y—R6)n (I)
wherein Y is NR2, O, or S, preferably NR2, n is 0 to 2, and wherein R4 is monovalent or divalent and is selected from: (a) substituted or unsubstituted, straight or branched, alkyl, mono- or poly-unsaturated alkyl, heteroalkyl, aliphatic, heteroaliphatic, or heteroolefinic systems; (b) substituted or unsubstituted, mono- or poly-cyclic aliphatic, aryl, or heterocyclic systems; or (c) substituted or unsubstituted, mono-, poly-, or per-fluoro alkyl systems; the systems of (a), (b), and (c) comprising from 1 to 12 carbon atoms and 0 to 5 heteroatoms selected from O, S, N, P, and Si; and wherein R4 can be connected to R3 or R5 to create a 5, 6, or 7 membered ring; and wherein R1, R2, R3, R5, and R6 are monovalent and are selected independently from: (a), (b), and (c) described herein above, or H.
Preferably, R4 is selected from: (a) substituted or unsubstituted, straight or branched, alkyl, heteroalkyl, aliphatic, heteroaliphatic, or heteroolefinic systems; (b) substituted or unsubstituted, mono- or poly-cyclic aliphatic, aryl, or heterocyclic systems; or (c) substituted or unsubstituted, mono-, poly-, or per-fluoro alkyl systems; more preferably R4 is selected from (a) substituted or unsubstituted, straight or branched, alkyl, heteroalkyl, aliphatic, or heteroaliphatic systems; (b) substituted or unsubstituted, aryl, or heterocyclic systems; or (c) substituted or unsubstituted, mono-, poly-, or per-fluoro alkyl systems; more preferably substituted or unsubstituted, straight or branched, alkyl, or heteroalkyl systems.
Preferably, the R4 systems of (a), (b), and (c), described herein above, comprise from 1 to 8 carbon atoms, preferably from 1 to 6, more preferably from 1 to 4 carbon atoms and from 0 to 3 heteroatoms; preferably from 0 to 2 heteroatoms; most preferably from 0 to 1 heteroatoms. Where the systems contain heteroatoms, preferably they contain 1 heteroatom. Preferred heteroatoms include O, S, and N; more preferred are O and N; O being paricularly preferred.
Preferably, R1, R2, R3, R5, and R6 are selected independently from any of the systems defined for R4 above, and H.
In alternative embodiments, any of R1, R2, R3, R4, R5, and R6 groups are substituted. Preferably, the substituent(s) is selected from: (a) the group of C-linked monovalent substituents consisting of: (i) substituted or unsubstituted, straight or branched, alkyl, mono- or poly-unsaturated alkyl, heteroalkyl, aliphatic, heteroaliphatic, or heteroolefinic systems; (ii) substituted or unsubstituted, mono- or poly-cyclic aliphatic, aryl, or heterocyclic systems; or (iii) substituted or unsubstituted, monofluoroalkyl, polyfluoroalkyl or perfluoroalkyl systems; said systems of (i), (ii), and (iii) comprising from 1 to 10 carbon atoms and 0 to 5 heteroatoms selected from O, S, N, P, and Si; (b) the group of S-linked monovalent substituents consisting of SA1, SCN, SO2A1, SO3A1, SSA1, SOA1, SO2NA1A2, SNA1A2, and SONA1A2; (c) the group of O-linked monovalent substituents consisting of OA1, OCN and ONA1A2; (d) the group of N-linked monovalent substituents consisting of NA1A2, (NA1A2A3)+, NC, NA1OA2, NA1SA2, NCO, NCS, NO2, N=NA1, N=NOA1, NA1CN, NA1NA2A3; (e) the group of monovalent substituents consisting of COOA1, CON3, CONA12, CONA1COA2, C(=NA1)NA1A2, CHO, CHS, CN, NC, and X; and (f) the group consisting fluoroalkyl monovalent substituents consisting of monofluoroalkyl, polyfluoroalkyl perfluoroalkyl systems comprising from 1 to 12 carbon atoms and 0 to 4 heteroatoms.
For the groups (b) to (e), described above, A1, A2, and A3 are monovalent and are independently selected from: (1) H; (2) substituted or unsubstituted, straight or branched, alkyl, monounsaturated or poly-unsaturated alkyl, heteroalkyl, aliphatic, heteroaliphatic or heteroolefinic systems; (3) substituted or unsubstituted, monocyclic or polycyclic aliphatic, aryl, or heterocyclic systems; or (4) substituted or unsubstituted, monofluoroalkyl, polyfluoroalkyl or perfluoroalkyl systems; said systems of (2), (3), and (4) comprising from 1 to 10 carbon atoms and 0 to 5 heteroatoms selected from O, S, N, P, and Si; and wherein X is a halogen selected from the group consisting of F, Cl, Br, and I.
Preferred substituents for use herein include those having a Hammett Sigma Para (σp) Value from −0.65 to +0.75, preferably from −0.4 to +0.5. Hammett Sigma Values are described in Advanced Organic Chemistry—Reactions, Mechanisms and Structure (Jerry March, 5th ed. (2001) at pages 368-375).
Alternative suitable radical scavengers for use herein are compounds according to the general formula (II)
wherein R1, R2, R3, R4, and R5 are each independently selected from H, COO−M+, Cl, Br, SO3− M+, NO2, OCH3, OH, or a C1 to C10 primary or secondary alkyl, and M is either H or alkali metal. Preferably, the above-described radical scavengers have a pKa of more than 8.5 to ensure protonation of the hydroxy goup.
Other suitable radical scavengers for use herein include those selected from group (III) benzylamine, imidazole, di-tert-butylhydroxytoluene, hydroquinone, guanine, pyrazine, piperidine, morpholine, methylmorpholine, 2-methyoxyethylamine, and mixtures thereof.
Preferred radical scavengers according to the present invention are selected from the classes of alkanolamines, amino sugars, amino acids, esters of amino acids and mixtures thereof. Particularly preferred compounds are: monoethanolamine, 3-amino-1-propanol, 4-amino-1-butanol, 5-amino-1-pentanol, 1-amino-2-propanol, 1-amino-2-butanol, 1-amino-2-pentanol, 1-amino-3-pentanol, 1-amino-4-pentanol, 3-amino-2-methylpropan-1-ol, 1-amino-2-methylpropan-2-ol, 3-aminopropane-1,2-diol, glucosamine, N-acetylglucosamine, glycine, arginine, lysine, proline, glutamine, histidine, sarcosine, serine, glutamic acid, tryptophan, and mixtures thereof, and the salts such as the potassium, sodium and ammonium salts thereof, and mixtures thereof. Especially preferred compounds are glycine, sarcosine, lysine, serine, 2 methoxyethylamine, glucosamine, glutamic acid, morpholine, piperidine, ethylamine, 3-amino-1-propanol, and mixtures thereof.
The radical scavengers according to the present invention preferably have a molecular weight of less than about 500, preferably less than about 300, more preferably less than about 250 in order to facilitate penetration of the radical scavenger into the hair fiber. The compositions of the present invention preferably comprise from about 0.1% to about 10% by weight, preferably from about 1% to about 7% by weight of radical scavenger. The radical scavenger is also preferably selected such that it is not an identical species as the alkalizing agent. According to one embodiment of the present invention the radical scavenger may be formed insitu in the hair dyeing compositions prior to application to the hair fibers.
To use the afore-described colorants for oxidative dyeing of hair, said colorants are mixed with an oxidant immediately before use, and the mixture is applied to hair in an amount sufficient for hair treatment which, depending on hair fullness, is generally from about 60 to 200 grams. Suitable oxidants for developing the hair color are mainly hydrogen peroxide or a compound of addition of hydrogen peroxide to urea, melamine, sodium borate, or sodium carbonate, in the form of a 3% to 12% by weight, preferably 6% by weight, aqueous solution, as well as air oxygen. When a 6% hydrogen peroxide solution is used as the oxidant, the weight ratio of hair colorant to oxidant is 5:1 to 2:1, and preferably 1:1. Larger amounts of oxidant are used primarily when the hair colorant contains a higher dye concentration or when stronger hair bleaching is desired at the same time.
The mixture is allowed to act on the hair at 15 to 50° C. for about 10 to 45 minutes and preferably for 30 minutes. The hair is then rinsed with water and dried. Optionally, this rinse can be followed with a shampoo wash, optionally followed by rinsing with a weak organic acid, for example citric or tartaric acid. The hair is then dried.
The hair dyes according to the invention with a content of 1,3-diaminobenzene derivatives of the formula (I) as coupler substances permit hair colorations with excellent color fastness, in particular with regard to washing fastness and rubbing fastness. With regard to the coloring properties, the hair colorants according to the invention offer, depending on the nature and composition of the color components, a broad palette of different shades which ranges from blonde via brown, purple, violet to blue, and black shades. The shades are characterized here by their particular color intensity. The very good coloring properties of the hair colorants according to the present application are further evident from the fact that these agents permit a coloring of gray, chemically non-predamaged hair without problems and with good coverage.
The following examples illustrate the object of the invention in more detail without limiting its scope.
Step A) Amide Formation:
In a screw cap tube under argon 1.5 ml of dimethylformamide are added to a mixture of 0.175 g (0.59 mmol) of {4-[(tert-butoxycarbonyl)amino]-2-nitrophenyl}acetic acid, 0.317 g (0.76 mmol) of O—(1H-6-chlorobenzotriazol-1-yl)-1,1,3,3-tetramethyluronium hexafluorophosphate (HCTU) and 0.130 g (0.767 mmol) of 6-chloro-1-hydroxybenzotriazole (Cl-HOBT). The mixture is cooled in an ice bath, and 1.5 eq (0.88 mmol) of the corresponding amine and 0.152 g (1.18 mmol) of diisopropylethyl-amine are added. The reaction mixture is stirred at room temperature overnight, diluted with chloroform, and after addition of an aqueous solution of sodium carbonate extracted with chloroform. The organic layer is filtered through a pad of magnesium sulfate/silica gel and concentrated under reduced pressure. Purification is performed by column chromatography on silica gel to afford the {4-[(tert-butoxy-carbonyl)amino]-2-nitrophenyl}acetamide derivative of formula (V) in 35% to 92% yield.
Step B) Deprotection:
2 ml of trifluoroacetic acid are added in methylene under argon to an ice cooled solution of 100 to 200 mg of {4-[(tert-butoxycarbonyl)-amino]-2-nitrophenyl}acetamide derivative of formula (V) obtained according to Step A). The mixture is stirred at room temperature (20-25° C.) for 2 hours, poured on an ice cold mixture of a saturated aqueous solution of sodium carbonate, and extracted with methylene chloride. The organic layer is filtered through a pad of magnesium sulfate and concentrated under reduced pressure to afford the corresponding 4-amino-2-nitrophenyl acetamide derivative. These derivatives are reduced without further purification.
Step C) Reduction:
60 to 150 mg of 4-amino-2-nitrophenyl acetamide derivative obtained according to Step B) are hydrogenated with hydrogen in 3 ml to 10 ml of ethanol/tetrahydrofurane 1:1 in the presence of Pd/C 10% (20 mg). After 2 to 4 hours the mixture is filtered through a pad of magnesium sulfate/celite and the filtrate is concentrated under reduced pressure. The crude product is purified by chromatography on silica gel to afford the product as solids or foams in 22% to 92% overall yield.
1. 2-(2,4-diaminophenyl)-N-propylacetamide
10 g of the above dye solution is mixed directly prior to application with 10 g of a 6% hydrogen peroxide solution. The mixture is then applied to bleached hair. After a contact time of 30 minutes at 40° C., the hair is rinsed with water, washed with a standard commercial shampoo, and dried. The resulting colorations are summarized in table 1.
Directly prior to application 30 g of the above coloring solution is mixed with 30 g of a 6% aqueous hydrogen peroxide solution. The mixture is then applied to bleached hair. After a contact time of 30 minutes at 40° C., the hair is rinsed with water, washed with a standard commercial shampoo, and dried. The coloring results are summarized in table 5.
Directly prior to application 30 g of the above coloring solution is mixed with 30 g of a 6% aqueous hydrogen peroxide solution. The mixture is then applied to bleached hair. After a contact time of 30 minutes at 40° C., the hair is rinsed with water, washed with a standard commercial shampoo, and dried. The coloring results are summarized in table 6.
Unless stated otherwise, all of the percentages given in the present application are percentages by weight.
The dimensions and values disclosed herein are not to be understood as being strictly limited to the exact numerical values recited. Instead, unless otherwise specified, each such dimension is intended to mean both the recited value and a functionally equivalent range surrounding that value. For example, a dimension disclosed as “40 mm” is intended to mean “about 40 mm”.
All documents cited in the Detailed Description of the Invention are, in relevant part, incorporated herein by reference; the citation of any document is not to be construed as an admission that it is prior art with respect to the present invention. To the extent that any meaning or definition of a term in this written document conflicts with any meaning or definition of the term in a document incorporated by reference, the meaning or definition assigned to the term in this written document shall govern.
While particular embodiments of the present invention have been illustrated and described, it would be obvious to those skilled in the art that various other changes and modifications can be made without departing from the spirit and scope of the invention. It is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of this invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 05018738.4 | Aug 2005 | EP | regional |
