JPH11147812A - Hairdye and its hair-dyeing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a hairdye which is excellent in safety, stability and fastness and can dye hair in natural hair color and to provide a method for dyeing hair. SOLUTION: This hairdye includes a melanin intermediate and a composite- forming substance of boron-containing compound as active ingredients. The two pack-type hairdye contains this hairdye as the first preparation and a pH regulator as the second preparation The above-stated one pack-type hairdye is applied to hair as it is. On the two pack-type hairdye, the first preparation is initially applied to hair, and the second preparation is then applied as it is after a given period of time or after being washed with water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hair dye and a hair dyeing method using the same,
The present invention relates to a hair dye comprising a melanin intermediate and a complex forming substance of a boron compound, or a hair dye using the above hair dye as one agent and two pH adjusters as well as a hair dyeing method thereof.

[0002]

2. Description of the Related Art As for hair dyeing, means of plant dyeing and mineral hair dyeing such as henna, chamomile and walnut in Europe and ink drengin in Asia have been known for a long time. In the 1880's, Monnet et al. Commercialized a completed product called hair dye. In recent years, fashion diversification has led to a variety of fashions. There are demands for various types of hair dyes depending on the purpose, such as hair.

[0003] Known hair dye substances include natural animal and plant extracts, hair dyes utilizing the reaction of metal salts with color formers, tar dyes, oxidation dyes of phenyleneamines, and the like. The most commonly used oxidation dyes are those in which a basic low molecular compound such as phenylenediamine, which is the first agent, is first penetrated into hair, and is oxidized and condensed by the oxidizing agent of the second agent to form a color. . In this method, a dye is not chemically bonded to hair, but a color forming body which has condensed in hair and has become a large molecule is physically bound in hair.

[0004] In the case of oxidation dyes, it is characterized by relatively little discoloration after dyeing. However, commercially available hair dyes generally promote the penetration of basic low-molecular compounds into hair,
There are many drawbacks in that the hair dye is alkaline, which causes damage to the protein hair, scalp and skin.
For this reason, some hair dyes are made weakly acidic, but the hair dyeing effect is much lower than that of alkaline hair dyes. There are also problems such as skin irritation by the oxidizing agent used as the second agent, decolorizing action on black hair, and carcinogenic action of the imine compound generated in the process of oxidizing basic low molecules.

[0005] Extracts of walnut peel, chamomile, henna, logwood, etc., which have been used for a long time, have a low degree of dyeing and only gradually develop color after several dyeing treatments. Not used. In addition, there is also a method of forming a metal such as iron, silver, bismuth, etc. on a color forming agent such as tannic acid, pyrogallol, hematein, logwood extract to form a color. In addition, there are problems such as the fact that the color is constant and the toning is difficult. Furthermore, tar dyes have a problem that they are inferior in dyeing power to hair and durability of hair after dyeing compared to oxidation dyes.

Thus, currently used hair dyes are:
Various problems remain in safety, dyeability, and the like, and development of a hair dye that is safe for the human body and can be dyed into a natural hair color has been desired.

[0007]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a completely new type of hair dye which is excellent in safety, stability and firmness and can be dyed into natural hair color. Is to do.

[0008]

DISCLOSURE OF THE INVENTION The present invention has been proposed in order to achieve the above-mentioned object, and a complex of a melanin intermediate and a boron compound forming a complex in a neutral region is formed in an acidic region. And a melanin intermediate and a boron compound are dissociated, and the dissociated melanin intermediate is immediately melanized by autoxidation to produce black melanin, based on a mechanism first discovered by the present inventors.

That is, according to the present invention, there is provided a hair dye containing a complex of a melanin intermediate and a boron compound as an active ingredient.

Further, according to the present invention, there is provided a two-part hair dye comprising a hair dye containing a complex forming substance of a melanin intermediate and a boron-containing compound as an active ingredient, and a pH adjuster.

Further, according to the present invention, there is provided a hair dyeing method comprising applying a hair dye containing a complex forming substance of a melanin intermediate and a boron-containing compound as an active ingredient to hair. Further, according to the present invention, there is provided a hair dyeing method, which comprises applying a hair dye containing a complex forming substance of a melanin intermediate and a boron-containing compound as an active ingredient to hair, and then applying a pH adjuster. Is done.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An important feature of the hair dye of the present invention is that a complex of a melanin intermediate and a boron compound is used as an active ingredient. Although this hair dye is useful alone, it can also be used as a two-part hair dye having one hair dye and two pH adjusters. FIG. 1 shows how black melanin is produced when a complex of a boron compound (boronophenylalanine; hereinafter also referred to as BPA) and a melanin intermediate (DHI) in the present invention is used.

This hair dyeing mechanism can be explained as follows. First, when a hair dye containing a complex of a melanin intermediate and a boron compound is penetrated into hair, the complex of the melanin intermediate and the boron compound is dissociated in the hair because the hair itself is slightly acidic. The melanin intermediate dissociated in the hair is oxidized to produce black melanin, and can be dyed into a natural hair color. Oxidation of the melanin intermediate, which occurs in hair, is autoxidation, so it takes around 2 to 3 hours to dye it into a natural hair color. Since the complex of the melanin intermediate and the boron compound has a property of dissociating in an acidic region (preferably pH 4 to 6),
By applying a pH adjuster as the second liquid, dissociation of the complex in the hair can be promoted, and the dyeing time can be shortened.

The complex of a melanin intermediate and a boron-containing compound to be blended as an active ingredient of the present invention may be a melanin intermediate (DHICA, DHI), for example, boronophenylalanine, boroglycine, borodimethylglycine, potassium tartrate, boric acid, It is obtained by reacting a boron-containing compound such as dihydroxyphenylborane, borobetaine and sodium tetraborate.

For reference, FIG. 2 shows the formation of a complex between a boron compound and a melanin intermediate, taking BPA as an example.

[0016] p which is blended as two agents of the hair dye of the present invention
The H adjuster refers to an agent capable of adjusting the pH to an acidic region (pH 4 to 6), and may be used without limitation as long as the pH is adjusted to an acidic region. Examples include hydrochloric acid, glycine, dibasic sodium citrate, tartaric acid, sodium tartrate, citric acid, dibasic sodium phosphate, lactic acid, sodium lactate, veronal sodium,
Succinic acid, borax, acetic acid, sodium acetate, potassium citrate, sodium hydroxide, potassium hydrogen phthalate, potassium phosphate monobasic, and the like, preferably tartaric acid, sodium tartrate, citric acid, and secondary phosphoric acid Examples include sodium, emulsion, sodium emulsion, potassium citrate, and sodium hydroxide.

As an actual hair dyeing method, for example, the following method can be exemplified, but it is not limited to this method. Method example: A method in which a hair dye containing a melanin intermediate-boron compound complex is applied to the hair, left for about 20 minutes, and then sufficiently washed with water. Example of method: One agent containing a melanin intermediate-boron compound complex is applied to the hair, left for about 20 minutes, and then p
The two agents containing the H adjuster are applied and left for about 20 minutes. After that, it is sufficiently washed with water. Method example: One agent containing a melanin intermediate-boron compound complex is applied to the hair, left for about 20 minutes, and then washed with water. Further, two agents containing a pH adjuster are applied and left for about 20 minutes. After that, it is sufficiently washed with water. In any of these methods, there is no particular advantage in the effect on hair dyeing, but the hair dyeing method of the method example and the method of dyeing hair are faster than the method example.

As described above, the hair dye of the present invention has a one-part formula and a two-part formula. In any case, the compounding amount of the complex of the melanin intermediate and the boron compound is based on the total amount of the composition. It is 0.01 to 10% (by weight), preferably 0.1 to 2% (by weight).

In the present invention, the dosage form of the hair dye is
Solutions, ooze (including cream), solids, powders, aerosols and the like can be mentioned.

[0020]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, which do not mean that the present invention is limited to only these Examples.

<Test Example 1> Test Hair dyeing test a) Test method A hair gray hair bundle of a human was dyed by the following hair dyeing method, and the color tone of the hair was visually judged. After the hair was naturally dried, a scanning electron microscope (× 500 to × 750) was used.
In 0), the dermis was observed and the degree of damage caused by hair dyeing was examined.

Example of hair dyeing method Example: 0.1% DHI-BPA complex (50% EtO
H solution) for 20 minutes Example: Dipped in 1% DHI-BPA complex (50% EtOH solution) for 20 minutes Example: Dipped in 2% DHI-BPA complex (50% EtOH solution) for 20 minutes Comparative example: 1% p-phenylenediamine (50% EtO
H solution) for 30 minutes, and then dipped in a 6% hydrogen peroxide solution for 30 minutes. B) Test results The results are shown in Table 1. c) Discussion As shown in Table 1, the examples and the hair dyeability are excellent, the pain of the hair is small, and the hair is dyed in a natural texture. On the other hand, although the comparative example is excellent in hair dyeing properties, the pain of the hair is large.

[0023]

<Test Example 2> Test Hair dye fastness test a) Test method A human gray hair bundle was subjected to hair dyeing by the following hair dyeing method, and the dyed hair was subjected to a light resistance tester (ultraviolet regular life fade meter: (Suga Test Machine Co., Ltd., FA-5 type)
After irradiation for 24 hours, the change in the color tone of the dyed hair was visually observed.

[Dyeing method] Example: 0.1% DHI-BPA complex (50% EtO
H solution) for 20 minutes Example: Dipped in 1% DHI-BPA complex (50% EtOH solution) for 20 minutes Example: Dipped in 2% DHI-BPA complex (50% EtOH solution) for 20 minutes Comparative example: 1% p-phenylenediamine (50% EtO
H solution) for 30 minutes, and then dipped in a 6% hydrogen peroxide solution for 30 minutes. B) Test results The results are shown in Table 2. c) Consideration As shown in Table 2, the Examples and the Examples all have excellent fastness, whereas the Comparative Examples have discoloration,
There is a problem in terms of robustness.

[0026]

[Formulation Examples] Formulation examples of the hair dye of the present invention are shown below. In the prescription examples, “appropriate amount” means 100% of the total prescription
Indicates the weight ratio. <Formulation Example 1> Liquid preparation (wt%) DHICA-BPA complex 1.00 DHICA-sodium tetraborate complex 0.50 glycerin 5.00 sorbitol 4.00 polyoxyl stearate 40 1.55 ethanol 10.00 purified water qs Each component was mixed and stirred, and these were dissolved to produce a solvent.

<Formulation Example 2> Emulsion A (% by weight) DHI-potassium bitartrate complex 0.10 White petrolatum 2.50 Silicon oil 0.50 Stearyl alcohol 2.20 Sucrose fatty acid ester 5.00 Octyldodecanol 2. 20 Squalane 6.30 Jojoba oil 0.20 Polyoxyl stearate 40 2.50 B (% by weight) Dipropylene glycol 3.00 Propylene glycol alginate 0.30 Xanthan gum 0.05 Purified water Appropriate amount Heat A and B to dissolve . An emulsion was prepared by adding B to A.

<Formulation Example 3> Cream [1 agent] A (% by weight) DHI-borate complex 2.00 1,3-butylene glycol 3.00 Sorbitol 7.00 Purified water Appropriate amount B (% by weight) Polysorbate 60 2 .50 Glyceride monostearate 1.50 Cetanol 3.00 Vaseline 5.00 Octyldodecyl myristate 5.00 Octyldodecanol 6.00 Squalane 15.00 Heat A and B to dissolve. A was added to B to produce a cream. [2 agents] A (% by weight) Lactic acid 0.02 Sodium lactate 0.36 1,3-butylene glycol 3.00 Sorbitol 7.00 dl-PCA sodium (50%) 3.00 Purified water Appropriate amount B (% by weight) ) Polysorbate 60 2.50 Glyceride monostearate 1.50 Cetanol 3.00 Vaseline 5.00 Octyldodecyl myristate 5.00 Octyldodecanol 6.00 Squalane 15.00 A and B are heated and dissolved, and B is dissolved in A. In addition, it was emulsified to produce a cream.

<Formulation Example 4> Aerosol A (% by weight) DHI-borodimethylglycine complex 0.50 DHICA-dihydroxyphenylborane complex 0.50 Cetanol 1.20 Propylene glycol 2.00 Polyoxyethylene hydrogenated castor oil 2.00 Liquid paraffin 2.50 Polyvinylpyrrolidone 1.00 Methyl paraben 0.50 Ethanol 3.00 Purified water 10.00 B (wt%) LPG 4.00 A uniformly mixed and dissolved A, put into an aerosol container, and B in a conventional manner The aerosol was manufactured by filling the container.

<Formulation Example 5> Air Form A (% by weight) DHI-boroglycine complex 1.50 Polyoxypropylene butyl ether (40 PO) 15.00 Diisopropanolamine 0.50 Ethanol 50.00 Propylene glycol 3.00 Purified water Amount B (% by weight) LPG 4.00 A was uniformly mixed and put into a container, and B was filled into the container by a conventional method to produce an air foam.

The same effects as those shown in the examples were confirmed in all of the examples shown in these formulas.

[0033]

According to the present invention, a hair dye containing a complexing substance of a melanin intermediate and a boron compound as an active ingredient, or a completely new hair dye containing one agent and a pH adjuster as two agents. A hair dye of the type and a hair dyeing method thereof are provided, and the hair dye is excellent in safety, stability, fastness,
And it is possible to dye to natural hair color.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining how black melanin is produced when a complex of a boron compound melanin intermediate of the present invention is used.

FIG. 2 is a diagram for explaining a state of complex formation between a boron compound and a melanin intermediate when BPA is used as the boron compound of the present invention.

Claims (4)

[Claims] 1. A hair dye comprising a complex forming substance of a melanin intermediate and a boron-containing compound as an active ingredient. 2. A two-part hair dye comprising a hair dye containing a complex forming substance of a melanin intermediate and a boron-containing compound as an active ingredient, and a pH adjuster. 3. A hair dyeing method comprising applying a hair dye containing as an active ingredient a complex-forming substance of a melanin intermediate and a boron-containing compound to hair. 4. A hair dyeing method comprising applying a hair dye containing a complex forming substance of a melanin intermediate and a boron-containing compound as an active ingredient to hair, and then applying a pH adjuster.