Dye composition for keratinous fiber

Abstract: A hair dyeing composition comprising a special developer and a coupling agent is disclosed. The developer is a 4-aminophenol derivative substituted at the 2-position which is represented by the following formula (I), in which X represents a group -NHCOR¹ (R¹ is a linear or branched alkyl group having 1-5 carbon atoms), a group -COOR² [R² is a hydrogen atom, a linear or branched alkyl group having 1-5 carbon atoms, a monohydroxy alkyl group having 1-5 carbon atoms, a polyhydroxy alkyl group having 1-5 carbon atoms, or a group -(CH₂) n NR³R⁴ (R³ and R⁴ individually represent a hydrogen atom or a linear or branched alkyl group having 1-5 carbon atoms, and n denotes an integer of 1-5)], a group -CONHR², a nitrile group, a group -SO₃R², or a group -SO₂NR 2 / 2 (R² has the same meaning as defined above and the two R²s may be the same or different), or a salt thereof. The dye composition provides a high degree of saturation and vividness of colors as well as good fastness.

Description: BACKGROUND OF THE INVENTION Field of the Invention : This invention relates to a dye composition, and, more particularly, to a dye composition for keratinous fibers which is capable of dyeing keratinous fibers such as hairs and the like with a high degree of saturation and vividness. Description of the Background : Oxidizing dyes, in which a developer and a coupling agent are employed in combination, have widely been used for dyeing keratinous fibers such as hairs or the like. These oxidizing dyes make use of the strong dyeing capability of oxidizing coloring substances which are produced by the oxidizing-coupling reaction of a developer and a coupling agent. P-phenylenediamine derivatives, diaminopyridine, 4-aminopyrazolone derivatives, hetero-cyclic hydrazones, and the like are used as the developer (see for example EP-A-0226072, US-A-3698852, FR-A-2352542 and FR-A-1366799). These conventional oxidizing dyes have problems in their insufficient performances in terms of saturation or vividness of colors, dyeing capability, and fastness. Development of a dye which is free from these defects has, therefore, been desired. The present inventors have undertaken extensive studies in order to overcome the above problems in oxidizing dyes, and as a result found that the use of a specific 4-aminophenol derivative substituted at the 2-position as a developer for dyeing keratinous fibers provides a high degree of saturation and vividness of colors as well as good fastness. This finding has led to the completion of this invention. SUMMARY OF THE INVENTION Accordingly, an object of this invention is to provide a dye composition for keratinous fibers which provides a reddish color tone comprising a developer and a coupling substance, wherein said developer is a 4-aminophenol derivative substituted at the 2-position represented by the following formula (I), in which X represents a group -NHCOR¹ (R¹ is a linear or branched alkyl group having 1-5 carbon atoms), a group -COOR² [R² is a hydrogen atom, a linear or branched alkyl group having 1-5 carbon atoms, a monohydroxy alkyl group having 1-5 carbon atoms, a polyhydroxy alkyl group having 1-5 carbon atoms, or a group -(CH₂) n NR³R⁴ (R³ and R⁴ individually represent a hydrogen atom or a linear or branched alkyl group having 1-5 carbon atoms, and n denotes an integer of 1-5)], a group -CONHR², a nitrile group, a group -SO₃R², or a group -SO₂NR 2 / 2 (R² has the same meaning as defined above and the two R²s may be the same or different), or a salt thereof and wherein said coupling substance is selected from α-naphthol, 1,5-dihydroxynaphthalene, 1,7-dihydroxynaphthalene and 1,7-dihydroxynaphthalene-2-carboxylic acid. DETAILED DESCRIPTION OF THE INVENTION AND PREFERRED EMBODIMENTS Among 4-aminophenol derivatives substituted at the 2-position of the formula (I), preferable compounds for use as a developer of this invention are those having a group -NHCOR¹ (R¹ has the same meaning as previously defined), -CONHR 2' (R 2' is a hydrogen atom or a linear or branched alkyl group having 1-5 carbon atoms), -COOR 2' , -SO₃R 2' , -SO₂NH₂, or -CN for X in the formula (I). Given as preferable examples of such compounds are 2-acetylamino-4-aminophenol, 4-amino-2-propionylaminophenol, 4-amino-2-butylylaminophenol, 4-amino-2-carbamoylphenol, 4-amino-2-(methylcarbamoyl)phenol, 4-amino-2-(ethylcarbamoyl)phenol, 4-amino-2-(propylcarbamoyl)phenol, 4-amino-2-(isopropylcarbamoyl)phenol, 4-amino-2-(butylcarbamoyl)phenol, 5-aminosalicylic acid, methyl 5-aminosalicylate, ethyl 5-aminosalicylate, propyl 5-aminosalicylate, isopropyl 5-aminosalicylate, butyl 5-aminosalicylate, 2-nitrilo-4-aminophenol, 1-hydroxy-4-aminobenzene sulfonate, methyl 1-hydroxy-4-aminobenzene sulfonate, ethyl 1-hydroxy-4-aminobenzene sulfonic acid, propyl 1-hydroxy-4-aminobenzenesulfonate, isopropyl 1-hydroxy-4-aminobenzenesulfonate, butyl 1-hydroxy-4-aminobenzenesulfonate, 1-hydroxy-4-aminobenzenesulfonamide, and the like. Among these particularly preferable compounds are 2-acetylamino-4-aminophenol, 4-amino-2-propionylaminophenol, 4-amino-2-butylylaminophenol, 4-amino-2-carbamoylphenol, 5-aminosalicylic acid, methyl 5-aminosalicylate, ethyl 5-aminosalicylate, propyl 5-aminosalicylate, butyl 5-aminosalicylate, and the like. Especially preferable compounds are 5-aminosalicylic acid and the like. These compounds can be prepared according to known methods, e.g. methods described in Weil et al. Chem. Ber . 55B, 2664 (1922) (A process for the preparation of 5-amino salicylic acid), U. S. Patent No.2,103,552 (A process for the preparation of methyl 5-aminosalicylate), German Patent Publication No. 3,007,997 (A process for the preparation of 2-acetylamino-4-aminophenol), etc. Coupling agents which can afford a high degree of saturation and vividness with the proposed 4- aminophenol derivatives substituted at the 2-position are α-naphthol, 1,5-dihydroxynaphthalene, 1,7-dihydroxynaphthalene, and 1,7-dihydroxynaphthalene-2-carboxylic acid. A dye providing a reddish tone is important in order to satisfy a variety of needs for hair colors. According to the present invention, an excellent dye composition producing a vivid reddish hair color can be prepared by using 5-amino-salicylic acid as a developer and a naphthol as mentioned above as a coupling agent. The proportion of the developer and the coupling agent to be formulated into the dye composition of this invention is approximately in the range of 1:0.5 to 1:2 in molar ratio. Excessive use of one component to the other is allowable in this range. The developers and coupling agents can be employed either independently or in combination with one or more other types of developers or coupling agents. In addition to the above-mentioned developers and coupling agents, if necessary for producing a desired color, any known developers, coupling agents, conventional direct dyes, or the like can be formulated to the composition of this invention. Hairs or other objects are colored by the dye composition of this invention through an oxidizing coupling reaction of the components with the aid of oxygen in the air, when the dye composition is applied to the object to be dyed. Effecting the oxidizing coupling reaction with the aid of a chemical oxidizing agent, however, is more desirable. Especially preferable oxidizing agents are hydrogen peroxide, hydrogen peroxide-adduct of urea, melamine, or sodium borate, or a mixture of one of these hydrogen peroxide-adducts and potassium peroxide-disulfate, and the like. It is usually desirable to provide the dye composition of this invention in the form of either a cream, emulsion, gel, solution, or the like. Preparing the composition in such forms can be performed according to a conventional method. In this instance, in addition to the developers and coupling agents, various ingredients which are commonly used for cosmetics are formulated into the composition. Such ingredients include wetting agents (emulsifiers), solubilizing agents, viscosity increasing agents, stabilizers, tactile sense improvers, hair conditioning base components, perfumes, and the like. Wetting agents (emulsifiers) used in the composition include, for example, alkylbenzenesulfonates, fatty alcohol sulfates, alkylsulfonates, fatty acid alkanolamides, ethylene oxide adducts of fatty alcohol, and the like. Given as examples of viscosity increasing agents are methyl cellulose, starch, higher fatty alcohols, paraffin oils, fatty acids, and the like. Examples of stabilizers include reducing agents such as sulfites, hydroquinone derivatives, chelating agents, and the like. Tactile sense improvers and hair conditioning base components are typified by silicones, higher alcohols, various kinds of nonionic surface active agents and cationic polymers, and the like. The amounts of the developers plus coupling agents to be formulated into the above-mentioned form of the invented composition are 0.2 to 5% by weight, and preferably 1 to 3% by weight. Desirable amounts of the wetting agents (emulsifiers) and viscosity increasing agents in the composition is usually 0.5 to 30% by weight and 0.1 to 25% by weight, respectively. It is desirable that the overall pH of the composition be adjusted to the range of about 8 to 10. A typical procedure for dyeing keratinous fibers using the dye composition of this invention is now illustrated. A dye fluid is first prepared by adding an oxidizing agent to the dye composition to effect oxidizing coupling of the mixture. This dye fluid is applied to the subject keratinous fibers, which are then allowed to stand for about 10 to 50 minutes, preferably 25 to 35 minutes to effect action of the dye onto the fibers. The keratinous fibers thus sufficiently dyed are finally washed and dried. It is desirable that the temperature of the dye fluid be maintained between 15 to 40°C. A variety of developer-coupling agent combinations are possible when using the dye composition of the present invention. The color produced possesses excellent light resistance, washing resistance, and wear resistance. Furthermore, an excellent vivid reddish tone can be produced by using a naphthol as a coupling agent. Other features of the invention will become apparent in the course of the following description of the exemplary embodiments which are given for illustration of the invention and are not intended to be limiting thereto. EXAMPLES Example 1 Base components : oleic acid 10 wt% diethanolamide oleate 8 wt% oleyl alcohol 2 wt% polyoxyethyleneoctyldodecylether (Average EO mols: 20) 10 wt% ethanol 15 wt% propylene glycol 10 wt% ammonium chloride 3 wt% 25% aqueous ammonium 7 wt% water 35 wt% 100 g of the above base components were mixed with 0.01 mol of the developer and 0.01 mol of the coupling agent listed in Table 1. The mixture was adjusted to pH 9.5 with ammonia to produce dye compositions of this invention. To 100 g of the dye composition of this invention an equivalent weight of 6% aqueous hydrogen peroxide solution was added to prepare a dye solution. This dye solution was applied to a gray human hair, and was left at 30°C for 30 minutes. The hair was then washed with a shampoo and dried. Table 1 shows observed color tones of the dyed hairs. Developing Agents: P1: 2-acetylamino-4-aminophenol P2: 5-aminosalicylic acid P3: methyl 5-aminom salicylate Coupling Agents: C1: p-amino-o-cresol C2: α-naphthol C3: m-phenylenediamine C4: resorcin C5: 1,5-dihydroxynaphthalene C6: 1,7-dihydroxynaphthalene Composition Nos. Developers Coupling agents Color tone 1 P1 C1 orange 2 P1 C2 reddish brown 3 P2 C3 navy blue 4 P2 C4 purple 5 P3 C1 ochre 6 P3 C2 red 7 P3 C3 brown 8 P3 C4 ivory 9 P2 C2 red 10 P2 C5 purplish red 11 P2 C6 purplish red Example 2 The hair dyeing capabilities and the fastness of colors were determined on the composition Nos. 9, 10, and 11 prepared in Example 1. These performances were compared with those obtained using a comparative composition with a reddish brown color using p-aminophenol as a developing agent and p-amino-o-cresol as a coupling agent. The evaluation was made by observing the dyed hair colors after shampooing and washing with water (10 times repetition) and drying. A significant discoloration was observed on the hairs dyed with the comparative composition. On the other hand, no discoloration was recognized by the naked eye observation on the hairs dyed with the compositions of the present invention. Also, the dye compositions exhibited an excellent fastness.

Claims: A dye composition for keratinous fibers comprising a developer and a coupling substance, wherein said developer is a 4-aminophenol derivative substituted at the 2-position represented by the following formula (I), in which X represents a group -NHCOR¹ (R¹ is a linear or branched alkyl group having 1-5 carbon atoms), a group -COOR² [R² is a hydrogen atom, a linear or branched alkyl group having 1-5 carbon atoms, a monohydroxy alkyl group having 1-5 carbon atoms, a polyhydroxy alkyl group having 1-5 carbon atoms, or a group -(CH₂) n NR³R⁴ (R³ and R⁴ individually represent a hydrogen atom or a linear or branched alkyl group having 1-5 carbon atoms, and n denotes an integer of 1-5)], a group -CONHR², a nitrile group, a group -SO₃R², or a group -SO₂NR 2 / 2 (R² has the same meaning as defined above and the two R²s may be the same or different), or a salt thereof and wherein said coupling substance is selected from α-naphthol, 1,5-dihydroxynaphthalene, 1,7-dihydroxynaphthalene and 1,7-dihydroxynaphthalene-2-carboxylic acid. The dye composition for keratinous fibers according to Claim 1, wherein X in the formula (I) representing a 4-aminophenol derivative substituted at the 2-position is a group -NHCOR¹ (R¹ is a linear or branched alkyl group having 1-5 carbon atoms), -CONHR 2' , -COOR 2' , -SO₃R 2' , (R 2' is a hydrogen atom or a linear or branched alkyl group having 1-5 carbon atoms), -SO₂NH₂, or -CN. The dye composition for keratinous fibers according to Claim 1, wherein said 4-aminophenol derivative substituted at the 2-position is a compound selected from the group consisting of 2-acetylamino-4-aminophenol, 4-amino-2-propionylaminophenol, 4-amino-2-butylylaminophenol, 4-amino-2-carbamoylphenol, 5-aminosalicylic acid, methyl 5-aminosalicylate, ethyl 5-aminosalicylate, propyl 5-aminosalicylate, and butyl 5-aminosalicylate. The dye composition for keratinous fibers according to Claim 1, wherein said 4-aminophenol derivative substituted at the 2-position is 5-aminosalicylic acid.

Inventors: KAWASE JIRO, MANO TSUTOMU, MISU DAISUKE, OBAYASHI MICHIO, KAWASE, JIRO, MANO, TSUTOMU, MISU, DAISUKE, OBAYASHI, MICHIO
Applicants: KAO CORP, KAO CORPORATION
Application year: 1989
Main classification: A61K7
IPC codes: A61K8, D06P3, A61Q5