JP2017057165A - Oxidation hair dye - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oxidation hair dye that can dye even gray hair (that is, so that the L value of color difference is lower) and/or can further reduce a contrast generated when partially grayed hair is dyed.SOLUTION: The present invention provides an oxidation hair dye that comprises a precursor and coupler of an oxidation dye, hydrogen peroxide, and an alkaline agent. The content of hydrogen peroxide is 4.0 to 5.0 mass%, the pH thereof is 8.90 to 9.90, the content ratio of the precursor is 0.10 to 0.50 mass%, and the content ratio of the coupler is 0.09 to 0.45 mass%.SELECTED DRAWING: None

Description

  The present invention relates to an oxidation hair dye obtained by mixing a first agent containing an oxidation dye and an alkali agent and a second agent containing hydrogen peroxide, and a hair dyeing method using the same.

  At present, hair coloring is widely used, and hair coloring agents based on various principles corresponding to the purpose and the like are commercially available. Among these, oxidative hair dyes are widely used because they have good dyeability and high sustainability.

  An oxidative hair dye is composed of a first agent containing an oxidative dye and an alkali agent and a second agent containing an oxidant, and is used by mixing them during use. When this is applied to the hair, the alkaline agent expands the hair and increases the permeability of the oxidation dye, and reacts with the oxidation agent (usually hydrogen peroxide) to develop the color of the oxidation dye and melanin in the hair. The hair is dyed.

  However, in general, it has a hydrophobic property, and therefore, it is said that the oxidative dye hardly penetrates and is difficult to dye. In order to solve this problem, Patent Document 1 proposes a first agent for oxidative hair dye, which is a combination of a specific surfactant and a specific ester.

  In addition, due to the above problems, when hair is partially dyed on white hair, there is a contrast between the two due to the difference between the dyeability of the white hair portion and the other hair portions. There was also a problem of end up.

JP 2009-161492 A

  The present invention can darken even white hair (that is, so that the L value of the color difference is lower) and / or the contrast produced when hair is partially dyed on hair containing white hair. It is an object of the present invention to provide an oxidative hair dye that can further reduce hair loss.

  As a result of intensive studies, the present inventors have found that the above problems can be solved by adjusting the pH, hydrogen peroxide concentration, precursor concentration, and coupler concentration in the oxidative hair dye. The present invention has been completed as a result of further research based on this finding. That is, the present invention includes the following aspects.

Item 1. An oxidation hair dye containing an oxidation dye precursor and coupler, hydrogen peroxide, and an alkali agent, wherein the hydrogen peroxide content is 4.0 to 5.0 mass%, and the pH is 8.90. The oxidation hair dye which is -9.90, the content rate of this precursor is 0.10-0.50 mass%, and the content rate of this coupler is 0.09-0.45 mass%.
Item 2. (A) The pH is 8.90 to 9.30, the precursor content is 0.20 to 0.50 mass%, and the coupler content is 0.13 to 0.45 mass%. Or (B) the pH is 9.30 to 9.50, the precursor content is 0.15 to 0.40 mass%, and the coupler content is 0.09 to 0.34. Or (C) the pH is 9.50 to 9.90, the precursor content is 0.10 to 0.35 mass%, and the coupler content is 0.09 to Item 3. The oxidative hair dye according to Item 1, which is 0.30% by mass.
Item 3. (A) The pH is 9.00 to 9.30, the precursor content is 0.25 to 0.40%, and the coupler content is 0.20 to 0.40 mass%. Or (B) the pH is 9.30 to 9.50, the precursor content is 0.20 to 0.30 mass%, and the coupler content is 0.10 to 0.30 mass. Or (C) the pH is 9.50 to 9.80, the content of the precursor is 0.15 to 0.25% by mass, and the content of the coupler is 0.10 to 0 The oxidative hair dye of claim | item 1 or 2 which is .25 mass%.
Item 4. Item 4. The oxidative hair dye according to any one of Items 1 to 3, wherein the hydrogen peroxide content is 4.0 to 5.0 mass%.
Item 5. Item 5. The oxidative hair dye according to any one of Items 1 to 4, which is for white hair dyeing.
Item 6. Item 6. The oxidative hair dye according to any one of Items 1 to 5, which is used for hair having a white hair ratio of 5 to 95%.
Item 7. Item 7. The oxidative hair dye according to any one of Items 1 to 6, comprising a nonionic surfactant and a cationic surfactant.
Item 8. Oxidative dye precursor and coupler, and first agent for oxidative hair containing alkaline agent and second agent for oxidative hair containing oxidant, mixing ratio of first agent and second agent The manufacturing method of the oxidative hair dye in any one of claim | item 1-7 including mixing so that it may become 1: 3-5.
Item 9. Item 8. A hair dyeing method comprising applying the oxidative hair dye according to any one of Items 1 to 7 to hair.
Item 10. Item 10. The hair dyeing method according to Item 9, wherein the hair is hair having a white hair ratio of 5 to 95%.

  By using the oxidative hair dye of the present invention, even white hair can be dyed darker (that is, so that the L value of the color difference becomes lower). Further, by using the oxidative hair dye of the present invention, it is possible to further reduce the contrast generated when hair is partially dyed on hair including white hair.

  In the present invention, the term “oxidative hair dye” means a precursor and coupler of an oxidative dye, and a first agent (first agent for oxidative hair dye) containing an alkaline agent, and a second agent (oxidative hair dye) containing an oxidant. The agent obtained by mixing with the 2nd agent for hair dyeing is shown.

1. The present invention relates to an oxidation hair dye containing an oxidation dye precursor and coupler, hydrogen peroxide, and an alkali agent, wherein the hydrogen peroxide content is 4.0 to 5.0% by mass. The pH is 8.90 to 9.90, the precursor content is 0.10 to 0.50 mass%, and the coupler content is 0.09 to 0.45 mass%. The present invention relates to an oxidative hair dye (sometimes referred to herein as “the oxidative hair dye of the present invention”). This will be described below.

  The precursor of the oxidative dye (in this specification, simply referred to as “precursor”) is not particularly limited as long as it is colored by polymerization after being combined with a coupler described later. The precursor which can be employ | adopted can be used widely. Examples of the precursor include toluene-2,5-diamine hydrochloride, paraphenylenediamine hydrochloride, orthoaminophenol, p-phenylenediamine, toluene-2,5-diamine, toluene-3,4-diamine, o-aminophenol, p. -Aminophenol, p-methylaminophenol, orthoaminophenol sulfate, orthochloroparaphenylenediamine sulfate, 4,4'-diaminodiphenylamine sulfate, toluene-2,5-diamine sulfate, paraaminophenol sulfate, paraphenylenediamine sulfate, sulfuric acid Paramethylaminophenol and the like can be mentioned. Among these, p-phenylenediamine, paraphenylenediamine hydrochloride, paraphenylenediamine sulfate, toluene-2,5-diamine sulfate, paraaminophenol, and the like are preferable from the viewpoint that the effects of the present invention are more reliably exhibited. More preferred are -phenylenediamine, paraphenylenediamine hydrochloride, paraphenylenediamine sulfate and the like, and more preferred is p-phenylenediamine.

  One type of precursor may be used, or a combination of two or more types may be used.

  The content ratio of the precursor (mass% relative to 100 mass% of the oxidative hair dye) is 0.10 to 0.50 mass%. From the viewpoint that the effects of the present invention are more effectively exhibited, the content is preferably 0.15 to 0.40 mass%. In addition, in this specification, the content rate of a precursor is the oxidation immediately after mixing the 1st agent for oxidative hair dyeing, and the 2nd agent for oxidative hair dyeing (that is, before polymerization of a precursor and a coupler occurs). The content rate in a hair dye is shown.

  The coupler of the oxidative dye is not particularly limited as long as it is combined with the above-mentioned precursor and develops color by polymerization, and couplers that can be used in oxidative hair dyes can be widely used. Examples of the coupler include 2,4-diaminophenoxyethanol hydrochloride, m-phenylenediamine, 2,6-diaminopyridine, 5-aminoorthocresol (paraaminoorthocresol), m-aminophenol, α-naphthol, hydroquinone, resorcin, and catechol. 3,3′-iminodiphenol, 2,4-diaminophenol hydrochloride, metaphenylenediamine hydrochloride, 1,5-dihydroxynaphthalene, 5- (2-hydroxyethylamino) -2-methylphenol, 5-aminoorthosulfate Examples include cresol, 2,4-diaminophenol sulfate, metaaminophenol sulfate, and metaphenylenediamine sulfate. Among these, from the viewpoint that the effects of the present invention are more reliably exhibited, 5-aminoorthocresol (paraaminoorthocresol), resorcin, m-aminophenol, 2,4-diaminophenoxyethanol hydrochloride, α-naphthol and the like are included. Preferably, 5-aminoorthocresol (paraaminoorthocresol), resorcin, m-aminophenol and the like are more preferable.

  One type of coupler may be sufficient and the combination of 2 or more types may be sufficient.

  The content ratio of the coupler (% by mass with respect to 100% by mass of the oxidative hair dye) is 0.09 to 0.45% by mass. From the viewpoint that the effects of the present invention are more effectively exhibited, the content is preferably 0.10 to 0.40 mass%. In addition, in this specification, the content rate of a coupler is the oxidation immediately after mixing the 1st agent for oxidative hair dyeing, and the 2nd agent for oxidative hair dyeing (that is, before polymerization of a precursor and a coupler occurs). The content rate in a hair dye is shown.

  Hydrogen peroxide is a component contained as an oxidizing agent.

  The content ratio of hydrogen peroxide (% by mass with respect to 100% by mass of the oxidative hair dye) is 4.0 to 5.0% by mass. From the viewpoint that the effects of the present invention are more effectively exhibited, the content is preferably 4.2 to 4.6% by mass, and more preferably 4.3 to 4.5% by mass. In the present specification, the hydrogen peroxide content is determined immediately after mixing the first agent for oxidative hair dye and the second agent for oxidative hair dye (that is, hydrogen peroxide is decomposed by the alkali agent). The content ratio in the previous (oxidative hair dye) is shown.

  The alkaline agent is not particularly limited as long as it can be blended with the first agent for oxidative hair dyeing. For example, ammonia water (for example, concentration 25 to 28%), monoethanolamine, triethanolamine, water Examples thereof include potassium oxide and sodium hydroxide.

  The content ratio of the alkaline agent (mass% with respect to 100% by mass of the oxidative hair dye) is a content that can expand the hair, enhance the permeability of the dye, and further promote the decomposition of hydrogen peroxide. There is no particular limitation. The content ratio is, for example, 0.01 to 15% by mass, preferably 0.1 to 10% by mass, more preferably 1.0 to 10% by mass, when ammonia water having a concentration of 25% is used as the alkaline agent (E). It is 8.0 mass%, More preferably, it is 3.5-6.0 mass%.

  The pH of the oxidative hair dye of the present invention is 8.90 to 9.90. From the viewpoint that the effects of the present invention are more effectively exhibited, the pH is preferably 9.00 to 9.80.

The following combinations (A) to (C) may be mentioned as more preferred combinations of pH, precursor content, and coupler content in the oxidative hair dye of the present invention. With such a combination, even white hair can be dyed darker (that is, so that the L value of the color difference is lower), and when hair is partially dyed on hair containing white hair It is possible to further reduce the contrast generated.
(A) pH is 8.90-9.30, the content rate of a precursor is 0.20-0.50 mass%, and the content rate of a coupler is 0.13-0.45 mass%.
(B) pH is 9.30-9.50, the content rate of a precursor is 0.15-0.40 mass%, and the content rate of a coupler is 0.09-0.34 mass%.
(C) pH is 9.50-9.90, the content rate of a precursor is 0.10-0.35 mass%, and the content rate of a coupler is 0.09-0.30 mass%.

  The pH in the combination (A) is preferably 9.00 to 9.30, more preferably 9.05 to 9.25, still more preferably 9.10 to 9.20, and still more preferably 9.13 to 9.17.

  The content ratio of the precursor in the combination (A) is preferably 0.25 to 0.40% by mass, more preferably 0.25 to 0.35% by mass, and still more preferably 0.28 to 0.32. % By mass.

  The content ratio of the coupler in the combination (A) is preferably 0.20 to 0.40% by mass, more preferably 0.25 to 0.35% by mass, and still more preferably 0.28 to 0.32. % By mass.

  The pH in the combination (B) is preferably 9.35 to 9.45, more preferably 9.38 to 9.42.

  The content ratio of the precursor in the combination (B) is preferably 0.20 to 0.30% by mass, and more preferably 0.23 to 0.27% by mass.

  The content ratio of the coupler in the combination (B) is preferably 0.10 to 0.30% by mass, more preferably 0.15 to 0.25% by mass, and further preferably 0.18 to 0.22%. % By mass.

  The pH in the combination (C) is preferably 9.50 to 9.80, more preferably 9.50 to 9.70, still more preferably 9.55 to 9.65, and still more preferably 9.58 to 9.62.

  The content ratio of the precursor in the combination (C) is preferably 0.15 to 0.25% by mass, more preferably 0.18 to 0.22% by mass.

  The content ratio of the coupler in the combination (C) is preferably 0.10 to 0.25% by mass, more preferably 0.15 to 0.25% by mass, and further preferably 0.18 to 0.22%. % By mass.

  The dosage form of the oxidative hair dye of the present invention is not particularly limited, and various known dosage forms such as cream, transparent gel, translucent gel, emulsion, liquid, foam, etc. Can be adopted.

  In addition to the components described above, the oxidative hair dye of the present invention includes a solvent, a surfactant, an oil component, a direct dye, a stabilizer for an oxidative dye, and a stabilizer for an emulsified state, as necessary depending on the dosage form. , Oxidizing agent stabilizers, pH adjusters, animal and plant extracts, water-soluble polymers, amino acids and their derivatives, proteins and their derivatives, vitamins, UV protection agents, antioxidants, sequestering agents, fragrances, etc. The well-known component which can be mix | blended with a hair dye can be included. Among these, it is preferable that the oxidative hair dye of the present invention further contains a surfactant and an oil component from the viewpoint that the effects of the present invention can be more reliably exhibited.

  The solvent is not particularly limited, but is usually water. The content of the solvent is, for example, 20 to 90% by mass with respect to 100% by mass of the oxidative hair dye.

  The surfactant is not particularly limited as long as it is a surfactant that can be used for an oxidative hair dye, and a wide variety of known ones can be used. Examples of the surfactant include a nonionic surfactant, a cationic surfactant, an anionic surfactant, and an amphoteric surfactant. Among these, nonionic surfactants, cationic surfactants and the like are preferable from the viewpoint that the effects of the present invention are more reliably exhibited, and it is more preferable to use both of these.

  The nonionic surfactant is not particularly limited. For example, hydrophilic polyoxyethylene alkyl ether is preferable, and hydrophilic polyoxyethylene (added mole number of ethylene oxide: 10 to 40, preferably 15 to 35, more Preferably 20-30) alkyl (carbon atoms: 10-25, preferably 12-20, more preferably 14-18) ether is more preferred.

  The cationic surfactant is not particularly limited, but is preferably an alkyl quaternary ammonium salt, more preferably an alkyltrimethylammonium chloride, and an alkyl chloride (carbon atoms: 15 to 30, preferably 18 to 26, more preferably 20 to 20). 24) Trimethylammonium is more preferred.

  The content of the surfactant is, for example, 0.1 to 10% by mass, preferably 0.5 to 6% by mass with respect to 100% by mass of the oxidative hair dye from the viewpoint that the effects of the present invention can be more reliably exhibited. %, More preferably 1 to 4% by mass, still more preferably 1.5 to 3% by mass.

  The oil component is not particularly limited, and examples thereof include vegetable oils, animal oils, waxes, petroleum hydrocarbons, higher fatty acids, higher alcohols, and silicones. Among these, higher alcohols are preferable from the viewpoint that the effects of the present invention can be more reliably exhibited.

  Examples of vegetable oils include avocado oil, almond oil, olive oil, sesame oil, rice bran oil, safflower oil, soybean oil, corn oil, rapeseed oil, palm oil, castor oil, grape seed oil, coconut oil, and hardened oil. It is done.

  Examples of animal oils include emu oil, horse oil, mink oil, and the like. Examples of the wax include jojoba oil, carnauba wax, candelilla wax, rice bran wax, lanolin, shellac and the like.

  Examples of petroleum hydrocarbons include light isoparaffin, light liquid isoparaffin, squalane, paraffin, liquid paraffin, liquid isoparaffin, petrolatum, microcrystalline wax, and the like. Among these, liquid paraffin is preferable.

  Examples of the higher fatty acid include lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, oleic acid, isostearic acid, 12-hydroxystearic acid, and undecylenic acid.

  Examples of the higher alcohol include alcohols having 10 to 25 carbon atoms such as lauryl alcohol, myristyl alcohol, cetanol, stearyl alcohol, oleyl alcohol, behenyl alcohol, and cetostearyl alcohol.

  Examples of silicone include dimethyl silicone, cyclic silicone, polyether-modified silicone, amino-modified silicone, polyglycerin-modified silicone, and methylphenyl silicone.

  The content of the oil component is not particularly limited and can be appropriately adjusted. From the viewpoint that the effects of the present invention can be more reliably exhibited, the content of the oil component is, for example, 1 to 30% by mass, preferably 2 to 20% by mass, more preferably 100% by mass with respect to the oxidative hair dye. 3 to 12% by mass.

  The direct dye is not particularly limited, and examples thereof include 2-amino-4-nitrophenol, 2-amino-5-nitrophenol, nitroparaphenylenediamine hydrochloride, paranitroorthophenylenediamine, picramic acid, sodium picramate, Examples include 2-amino-5-nitrophenol sulfate, nitroparaphenylenediamine sulfate, paranitroorthophenylenediamine sulfate, and paranitrometaphenylenediamine sulfate.

  The stabilizer is not particularly limited. For example, ascorbic acids, thioglycolic acids, cysteines, mercapto compounds, sulfites, bisulfites, thiosulfates, phenacetin, sodium stannate, ethylene glycol phenyl ether, 8 -Oxyquinoline, phosphoric acid, 1-hydroxyethane-1,1-diphosphonic acid and its salt, dibutylhydroxytoluene, benzoic acid or its salt, salicylic acid or its salt, phenoxyethanol and the like.

  The pH adjuster is not particularly limited, and examples thereof include acids such as citric acid, phosphoric acid, malic acid, tartaric acid, and lactic acid; salts such as Na citrate and 2Na phosphate.

  The oxidative hair dye of the present invention comprises a first agent for oxidative hair containing a precursor and a coupler of an oxidative dye, and an alkaline agent (and further the above-described components as necessary), and an oxidant (and if necessary, the above-mentioned Can be produced by mixing with a second agent for oxidative hair dye containing the component). In Japan, the hydrogen peroxide concentration in the second agent for oxidative hair dye is only allowed up to 6%. Therefore, in order to achieve the hydrogen peroxide concentration (4.0-5.0%) in the oxidative hair dye of the present invention, mixing of the first agent for oxidative hair and the second agent for oxidative hair The ratio (first agent: second agent) is preferably about 1: 3 to 5.

  The oxidative hair dye of the present invention is suitable for dyeing gray hair because it can be dyed darker even with gray hair. Moreover, since the contrast which arises when dyeing with respect to the hair which partially contains white hair can be reduced more, it can be used suitably, for example with respect to the hair of 5 to 95% of white hair ratio.

2. Hair dyeing method This invention relates to the hair dyeing method (it may show as "the hair dyeing method of this invention" in this specification) including applying the oxidation hair dye of this invention to hair.

  The mode of application is not particularly limited, and a known mode can be adopted.

  After the application, it is usually left for a certain time (for example, 15 to 60 minutes) so that the reaction necessary for oxidative hair dyeing occurs sufficiently. Then, it is desirable to wash away excess components by washing with shampoo or the like and dry.

  EXAMPLES The present invention will be described in detail below based on examples, but the present invention is not limited to these examples.

(1) Preparation of first agent for oxidative hair dyeing The first agent for oxidative hair dyeing (pH 9.50, 9.70, or 9.90) was prepared according to the formulation shown in Tables 1 to 9 below. The preparation procedure of Example 1 is as follows. First, alkyltrimethylammonium chloride was added to purified water, and heated and dissolved while stirring. Thereafter, paraphenylenediamine, 5-aminoorthocresol, resorcin, metaaminophenol, and sodium ascorbate were added and maintained at 80 ° C. ( This is the aqueous phase solution). On the other hand, POE (25) cetyl ether, dicetyl phosphate, and cetanol were mixed, heated and dissolved with stirring, and maintained at 80 ° C. (this was used as an oil phase solution). Next, the oil phase solution was added while stirring the aqueous phase solution. After adding the oil phase solution, it was naturally cooled with stirring, and when it was cooled to 35 ° C., aqueous ammonia (25% aqueous solution) was added. Further, the mixture was naturally cooled with stirring, and when it was cooled to room temperature, the stirring was stopped. Other examples were also prepared in a similar manner. In Tables 1 to 9, the numerical values related to the precursor and the coupler are based on “(4) hair dyeing treatment” described later, with respect to 100% by mass of the hair dye obtained by mixing with the second agent for hair dyeing. The numerical value regarding the other components shows the mass% of the component with respect to 100 mass% of the 1st agent for oxidative hair dyeing, and "it makes 100 in total" means each other than purified water. It shows that the amount of purified water was added to the total amount of the components to be 100% by mass, and the pH was mixed with the second agent for oxidative hair dyeing in “(4) Hair dyeing treatment” described later. PH in the oxidative hair dye obtained in this way is shown.

(2) Preparation of Second Agent for Oxidative Hair A second agent for oxidative hair (pH 3.00) was prepared according to the formulation shown in Table 10 described later. The preparation procedure is as follows. First, alkyltrimethylammonium chloride was added to purified water, heated and dissolved with stirring, and maintained at 80 ° C. (this was used as an aqueous phase solution). On the other hand, cetostearyl alcohol, POE (25) cetyl ether, and liquid paraffin were mixed, heated and dissolved with stirring, and maintained at 80 ° C. (this was used as an oil phase solution). Next, the oil phase solution was added while stirring the aqueous phase solution. After adding the oil phase solution, the mixture was naturally cooled with stirring, and when it was cooled to 40 ° C., a hydroxyethane diphosphonic acid solution (60% aqueous solution) and a hydrogen peroxide solution (35% aqueous solution) were added. Further, the mixture was naturally cooled with stirring, and the stirring was stopped when it was cooled to room temperature, and the resulting composition was used as a production example of the second agent for oxidative hair dyeing.
In Table 10, the numerical value regarding the component indicates the mass% of the component with respect to 100 mass% of the second agent for oxidative hair dyeing. The amount of purified water was added to reach 100% by mass.

(3) Preparation of shampoo composition A shampoo composition was prepared according to the formulation shown in Table 11 below. The preparation procedure is as follows. First, polyoxyethylene alkyl (12,13) ether sulfate sodium (3EO), coconut oil fatty acid amide propyl betaine solution, and cocamidomethyl MEA are added to purified water, dissolved by heating and kept at 80 ° C. did. The mixture was naturally cooled with stirring, and when cooled to 40 ° C., citric acid and methylisothiazolinone were added. Further, the mixture was naturally cooled with stirring, and when it was cooled to room temperature, stirring was stopped, and the resulting composition was used as a production example of a shampoo composition. In Table 11, the numerical values related to the components indicate the mass% of the components with respect to 100 mass% of the shampoo composition, and “set to 100” means the total amount of each component other than purified water It shows that it was made to become 100 mass% by adding the amount.

(4) Hair dyeing treatment 2.5 g of the first agent for oxidative hair prepared in “(1) Preparation of first agent for oxidative hair” and the preparation of “(2) Second agent for oxidative hair” 7.5 g of the second agent for oxidative hair dyeing prepared in the above was mixed until uniform. Apply the brush to which the resulting mixture is adhered to the front and back of a hair bundle with 10% gray hair ratio (Maitai Japan, Shigle Tuft (10% mixed with white hair)) spread in a fan shape at 30 ° C. The hair was dyed by leaving it to stand for 30 minutes. Thereafter, the hair bundle was washed with water, and the washed hair bundle was washed once with the shampoo composition prepared in “(3) Preparation of shampoo composition” and dried.

(5) Evaluation of dyeability The sensory evaluation was performed by five professional panelists on the dyeing condition (darkness) of the hair bundles treated in the above “(4) Hair dyeing treatment”. The evaluation is made in 5 stages (5 points: very good, 4 points: good, 3 points: normal, 2 points: bad, 1 point: very bad), and the total points of each panel are summed up. Ranked by. Those rated as ◎ and ○ are acceptable as products. The results are shown in Tables 1-9.
<Standard>
A: Total score of 20 points or more B: Total score of 15 points or more and less than 20 Δ: Total score of 10 points or more and less than 15 points ×: Total score of less than 10 points

(6) Evaluation of contrast The sensory evaluation by five professional panelists on the contrast between the portion where the white hair is dyed and the portion where the black hair is dyed in the hair bundle treated in the above "(4) Hair dyeing treatment". Went. Evaluation is made in 5 stages (5 points: no contrast can be confirmed, 4 points: no contrast can be confirmed, 3 points: the contrast can be confirmed or neither, 2 points: the contrast can be confirmed, 1 point: clear contrast The total score of each panel was summed up and ranked according to the following criteria. Those rated as ◎ and ○ are acceptable as products. The results are shown in Tables 1-9.
<Standard>
A: Total score of 20 points or more B: Total score of 15 points or more and less than 20 Δ: Total score of 10 points or more and less than 15 points ×: Total score of less than 10 points

Claims (10)

An oxidation hair dye containing an oxidation dye precursor and coupler, hydrogen peroxide, and an alkaline agent,
The hydrogen peroxide content is 4.0 to 5.0 mass%, the pH is 8.90 to 9.90, the precursor content is 0.10 to 0.50 mass%, And the content rate of this coupler is 0.09-0.45 mass%,
Oxidative hair dye. (A) The pH is 8.90 to 9.30, the precursor content is 0.20 to 0.50 mass%, and the coupler content is 0.13 to 0.45 mass%. Or (B) the pH is 9.30 to 9.50, the precursor content is 0.15 to 0.40 mass%, and the coupler content is 0.09 to 0.34. Or (C) the pH is 9.50 to 9.90, the precursor content is 0.10 to 0.35 mass%, and the coupler content is 0.09 to 0.30% by mass,
The oxidative hair dye of Claim 1. (A) The pH is 9.00 to 9.30, the precursor content is 0.25 to 0.40%, and the coupler content is 0.20 to 0.40 mass%. Or (B) the pH is 9.30 to 9.50, the precursor content is 0.20 to 0.30 mass%, and the coupler content is 0.10 to 0.30 mass. Or (C) the pH is 9.50 to 9.80, the content of the precursor is 0.15 to 0.25% by mass, and the content of the coupler is 0.10 to 0 .25% by weight,
The oxidative hair dye of Claim 1 or 2. The oxidative hair dye in any one of Claims 1-3 whose content rate of the said hydrogen peroxide is 4.2-4.6 mass%. The oxidative hair dye according to any one of claims 1 to 4, which is for white hair dyeing. The oxidative hair dye according to any one of claims 1 to 5, which is used for hair having a white hair ratio of 5 to 95%. The oxidative hair dye in any one of Claims 1-6 containing a nonionic surfactant and a cationic surfactant. Oxidative dye precursor and coupler, and first agent for oxidative hair containing alkaline agent and second agent for oxidative hair containing oxidant, mixing ratio of first agent and second agent The manufacturing method of the oxidative hair dye in any one of Claims 1-7 including mixing so that it may become 1: 3-5. A hair dyeing method comprising applying the oxidative hair dye according to any one of claims 1 to 7 to hair. The hair dyeing method according to claim 9, wherein the hair is hair having a white hair ratio of 5 to 95%.