JP2003171246A - Hairdye - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a safe hairdye capable of dyeing the hair without adsorption of a coloring matter (an acid dye) on the skin (e.g. scalp), hardly causing discoloration of the coloring matter, and free from bad effects such as the damage of the hair, and further to provide a method for dyeing the hair by using the hairdye. <P>SOLUTION: The hair is dyed by using (A) an acid dye having ≤1,000 molecular weight, and (B) a water-soluble polymer, especially a nonionic water-soluble polymer (e.g. a hydroxyethylcellulose) as a thickener present in (C) water and/or a water-soluble organic solvent within a neutral pH region of 6.5-7.5 without formulating an acid such as citric acid, or within an alkaline pH region of 7.0-11.0 regulated by formulating (D) a proper pH regulator when dyeing the hair by the hairdye. As a result, the dye penetrates into the inside of the hair and the inside of the hair fiber is dyed without causing adsorption of the coloring matter on the surface of the hair and the skin. The objective hairdye is provided by using the phenomena. The method for dyeing the hair by using the hairdye is also provided. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a novel hair dye and a hair dyeing method using the same, which is in a neutral pH range (preferably,
The present invention relates to a hair dye that can be dyed in a pH range of 6.5 to 7.5) or an alkaline pH range (preferably pH of 7.0 to 11.0), and a hair dyeing method using the same.

[0002]

2. Description of the Related Art As a method for dyeing (dying) hair in a desired color, hair dye (oxidizing dye), which is also called "permanent hair dye", can exhibit good dyeability and fastness to hair. An oxidative hair dye containing an oxidizing agent), and a color rinse or hair manicure having a slightly better dyeability and fastness, although the dyeability and fastness are lower than those of hair dye.

As a hair dye, an oxidative hair dye comprising an oxidative dye such as an aromatic compound such as p-phenylenediamine and an oxidant such as hydrogen peroxide is widely used. This oxidative hair dye can exhibit good dyeability and fastness to hair.

On the other hand, hair manicure is a hair dye which uses an acid dye as a pigment, and is mixed with an acid such as citric acid to adjust the pH.
It is adjusted to 2 to 4 and applied to the hair, and the dye is dyed by adsorbing the dye to the hair. That is,
Acid dyes ionize negatively when dissolved in water,
When the hair is wet with water, it normally ionizes negatively in a weakly acidic or neutral environment, but when it is acidified with citric acid or the like (for example, pH 2 to 4), the hair becomes positively ionized. The dye adsorbs ions to the hair,
To dye.

Therefore, a hair dye (hair manicure) containing an acid dye adjusted to pH 2 to 4 as a pigment, when applied to and adhered to the hair and scalp, ionizes the hair and scalp into positive ions to dye the hair and scalp. To wear. However, this type of hair dye has a strong dyeing performance and has the advantage that it is difficult to remove on the hair, but if it adheres to the scalp, it will strongly dye the scalp and drop the dyed hair dye. Therefore, even if a cold wave agent (reducing agent) or an alkaline agent is used, it is difficult to remove the hair dye once dyed.

[0006]

As described above, an oxidative hair dye (hair dye) comprising an oxidative dye and an oxidant can exhibit good dyeability and fastness to hair, and can be shampooed every time. Does not fade. However, p-phenylenediamine acts as a sensitizing substance by repeated use and causes an allergic reaction when used for a certain period of time, and since it uses an oxidizing agent, it easily irritates the scalp at the time of use, and an alkaline agent used in combination Has a problem of amplifying the stimulus.

On the other hand, a hair dye containing an acid dye such as hair nail polish dyes strongly on the hair as described above, but it is merely a method of dyeing by coating the surface of the hair,
The dyeing mechanism is different from dyeing by a hair dye, in which the dye penetrates into the hair and is dyed. Therefore, each time the shampoo was used, the color of the hair gradually faded (pigment was removed), and the texture of the hair deteriorated as the coating of the hair dye fell off, and the condition of the hair deteriorated. Further, on the hair surface where the pigment has fallen off, a part of the hair scalp on the hair surface may be lost and the hair may be damaged.

Further, such a hair dye is as described above.
Since it is adjusted to pH 2 to 4 with an acid such as citric acid for the purpose of adsorbing a dye anion (acid dye) on the hair, it is strongly dyed on the hair, but it is also strongly dyed on the scalp and it is used. It is a person's worries, and there has been a need for an advanced technique of how to dye the hair without adhering to the scalp.

Under such circumstances, pigments (for example, acid dyes, etc.) do not adhere to the scalp, and not only the pigment has high dyeability on the hair, but also the condition of the hair is reduced and the hair is damaged, and the scalp is damaged. It is required to develop a safe hair dye for users that does not cause irritation.

Therefore, the problem to be solved by the present invention is to dye hair (for example, hair) without adsorbing a dye (acid dye) on the skin (for example, scalp),
It is an object of the present invention to provide a safe hair dye which does not cause fading of the dye and does not have a bad influence such as damage to hair and a hair dyeing method using the same.

[0011]

Means for Solving the Problems As a result of intensive studies for solving the above problems, the present inventors have found that (A) an acidic dye having a molecular weight of at most 1000 (1000 or less) and a thickener ( B) A water-soluble polymer, especially a nonionic water-soluble polymer (for example, hydroxyethyl cellulose etc.) is contained in (C) water and / or a water-soluble organic solvent, and the pH is 6.5 without adding an acid such as citric acid. ~ 7.5
When a hair dye adjusted to a neutral pH range is used, the dye anion (acid dye) does not adsorb onto the hair surface,
It has been found that it penetrates inside the hair and dyes inside the hair fibres. Furthermore, since this hair dye is neutral, even if the dye anion adheres to the skin, it does not adsorb ions, so the dye (acid dye) can be easily washed simply by rinsing with warm water. Since the hair is completely penetrated into the interior and the hair is dyed, the hair dyed by shampoo every time does not fade, and the hair dye is adjusted to pH 7. When the pH is adjusted to an alkaline pH range of 0 to 11.0 and formulated (applied to hair), the pH adjuster (alkali agent) causes the salt bond of the hair (specifically, for example, NH ₃ ⁺ −). ^- bonds, and the like of the OOC)
It is found that the dyeing property is further improved because the dye is swelled and softened to make the environment in which the dye can more easily penetrate into the hair, and the present invention is completed based on these various findings. Arrived

That is, the first aspect of the present invention is as follows.
(A) an acid dye having a molecular weight of at most 1000,
A hair dye containing (B) a water-soluble polymer, (C) water and / or a water-soluble organic solvent and having a pH of 6.5 to 7.5 ("dyeing in the neutral pH range of the present invention. It is also referred to as “hair material”).

In the neutral pH hair dye of the present invention, the molecular weight of the acid dye is at most 500 (50).
When it is 0 or less), the dye easily penetrates into the hair, and the dyeability on the hair can be further improved. Furthermore, by using a nonionic water-soluble polymer as the water-soluble polymer, it is possible to further improve the dyeability of hair.

As a second aspect, the present invention comprises (A) an acidic dye having a molecular weight of at most 1000, (B) a water-soluble polymer, (C) water and / or a water-soluble organic solvent, and further, (D) pH 7.0 by containing a pH adjuster
It is possible to provide a hair dye (also referred to as “hair dye in the alkaline pH range of the present invention”) characterized by being adjusted to ˜11.0.

In the alkaline pH hair dye of the present invention, the acid dye has a molecular weight of at most 500.
When it is (500 or less), the dye easily penetrates into the hair, and the dyeability of the hair can be further improved. Furthermore, by using a nonionic water-soluble polymer as the water-soluble polymer, it is possible to further improve the dyeability of hair.

A third aspect of the present invention is to provide a hair dye containing (A) an acidic dye having a molecular weight of at most 1000, (B) a water-soluble polymer, (C) water and / or a water-soluble organic solvent. (Using), a hair dyeing method characterized by including a step of applying (dying hair) to hair at pH 6.5 to 7.5 ("Hair dyeing method of dyeing in neutral pH range of the present invention Also referred to as “”.

In the hair dyeing method for dyeing in the neutral pH range of the present invention, the molecular weight of the acid dye is at most 50.
When the hair dye is 0, the dye easily penetrates into the hair, and the dyeability of the hair can be further improved. Furthermore, by using a nonionic water-soluble polymer as the water-soluble polymer, it is possible to further improve the dyeability of hair.

As a fourth aspect, the present invention provides a hair dye containing (A) an acid dye having a molecular weight of at most 1000, (B) a water-soluble polymer, (C) water and / or a water-soluble organic solvent. In addition, (D) a pH adjusting agent is added, and p
A hair dyeing method (also referred to as "a hair dyeing method for dyeing in the alkaline pH range of the present invention") characterized by including a step of applying to hair (dying hair) with H 7.0 to 11.0. Can be provided.

In the hair dyeing method for dyeing in the alkaline pH range of the present invention, the acid dye has a molecular weight of at most 500, whereby the dye easily penetrates into the hair and It is possible to further improve the dyeability of Furthermore, by using a nonionic water-soluble polymer as the water-soluble polymer, it is possible to further improve the dyeability of hair.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below. The present invention has several forms, namely neutral p
Included are hair dyes for dyeing hair in H range (preferably pH 6.5 to 7.5) or alkaline pH range (preferably pH 7.0 to 11.0), and hair dyeing methods using these. . The neutral pH hair dye and the alkaline pH hair dye of the present invention and the hair dyeing method using the same are mainly described, but the present invention is not limited thereto. .

(Hair Dye in the Neutral pH Range of the Present Invention) The hair dye in the neutral pH range of the present invention will be described. The neutral pH hair dye of the present invention means that (A) the molecular weight is at most 1
000 acid dye, (B) water-soluble polymer, (C)
A hair dye in a neutral pH range (preferably pH 6.5 to 7.5) containing water and / or a water-soluble organic solvent, in which the hair, for example, hair A hair dye that dyes the inside of fibers. Therefore, all such hair dyes are included in the present invention.

The acid dye (A) having a molecular weight of at most 1000 used in the present invention is not particularly limited as long as it is water-soluble and can be used as usual cosmetics and quasi drugs. The acid dye has a molecular weight of at most 1000, and preferably, the acid dye having a molecular weight of at most 500 is selected. If the molecular weight of the acid dye exceeds 1,000, it is difficult to penetrate into the hair, which is not preferable. Further, specific examples of these acid dyes include, for example, Red No. 3, Red No. 102, and Red No. 10
No. 4, Red No. 106, Yellow No. 4, Yellow No. 5, Green No. 3,
Blue No. 1, Blue No. 2, Red No. 201, Red No. 227, Red No. 230, Red No. 231, Orange No. 205, Orange No. 207
No., Yellow No. 202, Yellow No. 203, Green No. 201, Green No. 204, Green No. 205, Blue No. 202, Blue No. 205
No. 201, brown 201, red 401, red 502, red 503, red 504, red 506, orange 402
No., yellow No. 402, yellow No. 403, yellow No. 406, yellow No. 407, green No. 401, green No. 402, purple 401
No. 401, black No. 401 and the like. These may be used alone or in admixture of two or more, depending on the desired hair color.

The content of the acid dye is 0.01 to 5% by weight based on the total amount of hair dye.

Examples of the water-soluble polymer (B) used in the present invention include cellulose-based water-soluble polymers such as hydroxyethyl cellulose, methyl cellulose, carboxymethyl cellulose and hydroxypropyl cellulose, gums such as xanthan gum, guar gum, pullulan, pectin and gum arabic. Water-soluble polymer, starch-based water-soluble polymer such as starch, dextrin, carboxymethyl starch, natural water-soluble polymer such as sodium alginate, sodium polyacrylate, carboxyvinyl polymer, polyvinyl alcohol, polyvinyl-pyrrolidone, etc. Examples of the polymer include a polymer. Among these, nonionic water-soluble polymers such as hydroxyethyl cellulose, methyl cellulose, hydroxypropyl cellulose, pullulan and polyvinylpyrrolidone are preferable, and hydroxyethyl cellulose is particularly preferable. Further, these water-soluble polymers may be used alone or in combination of two or more.

The content of the water-soluble polymer is 0.5 to 20% by weight based on the total amount of hair dye.

In the present invention, (C) water and / or a water-soluble organic solvent, that is, water, a water-soluble organic solvent or a mixed solvent thereof is used as a solvent for dissolving the acidic dye, the water-soluble polymer and the like. To use. The water-soluble organic solvent is not particularly limited as long as it is a water-soluble organic solvent,
For example, lower alkylene carbonates such as ethylene carbonate and propylene carbonate, N-methyl-2-
N-alkylpyrrolidone such as pyrrolidone and N-ethyl-2-pyrrolidone, N-cyclohexylformamide,
Formamide derivatives such as N, N-dibutylformamide and N-propyl-N-butylformamide, phenols such as resorcin, aralkyl alcohols such as benzyl alcohol, 1-phenylethyl alcohol and 2-phenylethyl alcohol, methanol, ethanol, propanol Examples thereof include lower alcohols such as butanol. Among these, N-methyl-2-pyrrolidone and benzyl alcohol are particularly preferable in that they have an action of promoting penetration of the hair dye into the hair. These water-soluble organic solvents may be used alone or in combination of two or more. Furthermore, when two or more of these water-soluble organic solvents are mixed and used as a mixed organic solvent, the mixed organic solvent and water may be mixed and used as a mixed solvent in the same manner as above.

In the present invention, when a mixed solvent prepared by mixing water and one or more water-soluble organic solvents is used, the amount of the water-soluble organic solvent used is not particularly limited, The water-soluble organic solvent may be appropriately mixed and used.

The hair dye in the neutral pH range of the present invention contains other components within a range that does not impair the purpose and effect of the present invention or exert a bad influence (out of the target pH range, etc.). , For example, emulsifiers, solubilizers, stabilizers, hair styling bases, preservatives,
Fragrances and the like can be added.

The hair dye of the present invention in the neutral pH range may be used as it is and applied to the hair, but in order to further improve the dyeability, it is preferably a cold wave agent first agent (reducing agent). ) And can be used as a mixture. In this case, since the hair has swollen to the level where the acid dye easily penetrates due to the action of the first cold wave agent, the acid dye easily penetrates into the hair and dyes the inside of the fiber of the hair. be able to.

The cold wave agent first agent is a reducing agent capable of cleaving the cystine bond of hair, and contains one or more of ammonium thioglycolate, cysteines and sodium sulfite. As long as it contains at least, a commercially available cold wave first agent can be used.

The amount of the hair dye of the present invention in the neutral pH range used is selected according to the length and amount of the hair to be dyed. For example, when applied to hair, it is preferable to apply about 80 g.

There is no particular difficulty in dyeing hair using the hair dye of the present invention in the neutral pH range. Conditions such as heating time vary depending on the quality of hair to be dyed. A hair method, for example, applying a hair dye to hair and applying the hair at an appropriate temperature (eg, about 45 ° C.) for an appropriate time (eg, about 5 ° C.).
20 minutes), far infrared heater, etc. (eg boomerang:
After heating with (manufactured by OOHIRO Co., Ltd.), the hair may be naturally left for an appropriate time (for example, about 5 to 20 minutes) to cool and then rinsed with warm water. In that case,
The hair dye in the neutral pH range of the present invention may be used as the hair dye.

(Hair dyeing agent of the present invention in the alkaline pH range)
The alkaline pH hair dye of the present invention contains (A) an acid dye having a molecular weight of at most 1000, (B) a water-soluble polymer, (C) water and / or a water-soluble organic solvent, PH range (preferably pH 6.5 to 7.
5) Hair dye (hair dye in the neutral pH range of the present invention)
In addition, by further containing (D) pH adjuster,
Alkaline pH range (preferably pH 7.0-11.
It is a hair dye adjusted to 0) and has an alkaline pH.
In the area, it is a hair dye that dyes the inside of fibers of hair, for example, hair. Therefore, all such hair dyes are included in the present invention.

In the present invention, (A) an acid dye having a molecular weight of at most 1000, (B) a water-soluble polymer, and a solvent for dissolving the acid dye and the water-soluble polymer (C) are used. The water and / or the water-soluble organic solvent are as described above.

The pH adjusting agent used in the present invention is not particularly limited as long as it is an alkaline pH adjusting agent, and examples thereof include ammonia water, alkanolamines such as monoethanolamine, and hydroxides such as sodium hydroxide and potassium hydroxide. Alkali, alkali carbonate such as sodium carbonate, alkali silicate such as sodium silicate, ammonium sulfate,
Examples thereof include inorganic ammonium salts such as ammonium nitrate, ammonium chloride, ammonium carbonate, primary ammonium phosphate, and secondary ammonium phosphate. still,
The amount of the pH adjuster used is not particularly limited, and the amount necessary for adjusting to the desired pH value is appropriately selected.

Further, the hair dye in the alkaline pH range of the present invention does not impair the objects and effects of the present invention, or has other adverse effects (out of the intended pH range, etc.). Ingredients such as emulsifiers, solubilizers, stabilizers, hair styling bases, preservatives and fragrances can be added.

Regarding the method for preparing a hair dye in the alkaline pH range of the present invention, the method of using the same and the amount thereof, and the method of dyeing hair using the same, the above-mentioned neutral pH range of the present invention is used. The contents described in the hair dye are referred to.

(Hair dyeing method for dyeing in the neutral pH range of the present invention) The hair dyeing method for dyeing in the neutral pH range of the present invention means
(A) an acid dye having a molecular weight of at most 1000,
(Using) a hair dye containing (B) a water-soluble polymer, (C) water and / or a water-soluble organic solvent, pH 6.5 to 7.
5. A hair dyeing method including a step of applying (dying hair) to hair (for example, head hair) in 5. Therefore, all hair dyeing methods including such steps are included in the present invention.

In the hair dyeing method for dyeing in the neutral pH range of the present invention, the hair may be used as it is and applied to the hair as described above, but in order to further improve the dyeability, it is preferably cold wave. It can be used as a mixture with the first agent (reducing agent). In this case, the inside of the fiber of the hair can be easily dyed in the same manner as described above. Furthermore, in this case, part of the hair has been reduced (the cystine bond of the hair has been cut), so after plain rinse, use a rod to wind the rod and neutralize it with the second cold wave agent. By fixing (re-bonding the cleaved cystine bond), wave fixation can be performed at the same time, which is convenient.

The second agent for the cold wave agent is a agent for recombining the cystine bond of the hair cut by the action of the first agent for the cold wave agent. Sodium bromate, potassium bromate, and hydrogen peroxide. Any commercially available cold wave agent second agent can be used as long as it contains at least one of them.

Further, in the hair dyeing method of dyeing in the neutral pH range of the present invention, the contents described in the hair dye of the present invention in the neutral pH range (preparation method of hair dye, use method and use thereof) The amount can be used as a reference to prepare the hair dye, and the hair dye can be applied to the hair (the hair is dyed).

(Hair Dyeing Method for Dyeing in the Alkaline pH Range of the Present Invention) The hair dyeing method for dyeing in the alkaline pH range of the present invention means (A) an acid dye having a molecular weight of at most 1,000, (B) A hair dye containing a water-soluble polymer, (C) water and / or a water-soluble organic solvent, and further containing (D) a pH adjusting agent to give hair (eg, hair) at pH 7.0 to 11.0. A hair dyeing method including a step of applying (dying hair). When dyeing hair with a hair dye in such an alkaline pH range, the hair swells and softens, and the dye easily penetrates into the hair, so when dyeing in the neutral pH range. It is possible to further improve the dyeability. Therefore, all hair dyeing methods including such steps are included in the present invention.

The hair dye can be prepared by referring to the contents described in the hair dye of the present invention in the alkaline pH range and applied to the hair (the hair is dyed).

In the hair dyeing method for dyeing in the alkaline pH range of the present invention, hair can be dyed by referring to the contents described in the hair dyeing method for dyeing in the neutral pH range of the present invention. it can.

In the hair dyeing method for dyeing in the alkaline pH range of the present invention, the hair dye in the alkaline pH range prepared by referring to the contents described in the hair dye in the alkaline pH range of the present invention is used. Not only a hair dyeing method including a step of applying to the hair (dying the hair) but also a hair dyeing method including a step of applying the hair dye in the neutral pH range of the present invention to the hair in an alkaline state. Included in the present invention.

[0046]

The present invention will be described in detail below with reference to examples, but the present invention is not limited to these examples.

[Example 1] (Preparation of neutral hair dye and dyeing of hair therewith) 80 g of a hair dye having a pH of 6.5 to 7.5 prepared according to the composition shown in Table 1 below was applied to hair. After heating for about 10 minutes with a far-infrared heater (Boomerang: OOHIRO Co., Ltd.) at about 45 ° C., it was left to cool for about 10 minutes and rinsed with warm water.

[0048]

[Table 1] Composition of hair dye (unit: wt%)

[Example 2] (Preparation of alkaline hair dye and dyeing of hair by the same) 3 hair dyes prepared in Example 1 and 1 pH adjuster prepared based on the composition of Table 2 below. 80g of alkaline hair dye with pH 7.0 to 11.0
Is applied to the hair and heated with a far infrared ray heater (Boomerang: OOHIRO Co., Ltd.) at about 45 ° C. for about 10 minutes,
It was left to cool for about 10 minutes and then rinsed with warm water.

[0050]

[Table 2] Composition of pH adjusting agent (alkaline agent) (unit:
wt%)

[Example 3] (Evaluation of various hair dyes) Hair dyed using the hair dyes prepared in Examples 1 and 2 was used as a conventional product (Comparative Example 1).
And 2) were used for comparative evaluation with hair dyed. In Comparative Example 1, 80 g of a commercially available hair dye was applied to hair in a weakly acidic to alkaline pH range and dyed by a conventional method. In Comparative Example 2, 80 g of commercially available hair nail polish was applied to the hair in an acidic pH range. The one dyed by a conventional method was used.

Electron micrographs of these hairs are shown in FIGS. 1 to 4 (see FIGS. 1 to 4). FIG. 1 shows Example 1.
The hair dyed in FIG. 2, the hair dyed in Example 2, the hair dyed in Comparative Example 1, and the hair dyed in Comparative Example 2 are observed. Figure 1 is 4000 times, Figure 2 is 15000 times, Figure 3 is 4000 times,
FIG. 4 is based on a photograph taken at 12000 times. It can be seen that the hair dyed with a commercially available hair dye (Comparative Example 1) is significantly damaged (see FIG. 3).

Hair prepared by the following steps was used, and thereafter, a transmission electron microscope (manufactured by JEOL Ltd .:
JEM-1010); fixed with 2.5% glutaraldehyde and osmium tetroxide (double fixed), dehydrated with ethanol, embedded in Epok 812 resin (manufactured by TAB), ultramicrotome (manufactured by Japan Automatic: MT
XL-7000) sliced to a thickness of about 0.009 μm and stained with lead and uranium (double staining).

Regarding the evaluation method, the dyeability was evaluated by a five-level evaluation by visual observation of the dyed hair, and the durability was evaluated by a five-level evaluation by visual observation of the degree of fading of the hair after 10 times of shampooing. The degree of hair damage was evaluated by a five-level evaluation by morphological observation under an electron microscope. In that case, the judgment criteria of the five-stage evaluation are as follows: dyeing property and durability are 1: poor, 2: slightly bad,
3: Normal, 4: Good, 5: Very good, and about the degree of damage to the hair, 1: Very damaged, 2: Damaged, 3: Slightly damaged, 4: Mostly damaged No
5: There was no damage at all.

The results of these evaluations are shown in Table 3 below.

[0056]

[Table 3] Evaluation of various hair dyes

(Evaluation Results) As is clear from the above results, among the applied hair dyes, the hair dye of the present invention (Example 1) was used.
And the hair dyes prepared in 2) have the least hair damage,
Good dyeability and durability. Therefore, it is understood that the hair dye of the present invention has higher performance as compared with the conventional products (see Table 3).

[Example 4] (Preparation of neutral hair dye containing the first agent of cold wave agent and dyeing of hair thereby) Neutral hair dye was applied to a female monitor in her thirties who wanted a deep dyeing power for fashionable dyeing. 80g of the hair dye prepared in 1 and 3 of the cold wave preparation prepared according to the composition of Table 4 below in a ratio of 1 was applied to the hair, and the hair was applied at about 45 ° C. for about 5 to 5. Far infrared heater for 20 minutes (Boomerang: OOHIRO Co., Ltd.)
After being warmed in, the mixture was naturally left for about 5 to 20 minutes for cooling and then rinsed with warm water. After that, the rod was wound with a rod, and after an appropriate period of time, 80 g of a second cold wave agent prepared based on the composition shown in Table 5 below.
Neutralization was carried out, and after an appropriate period of time, the rod was removed and rinsed with warm water for rinsing.

[0059]

[Table 4] Composition of the first agent of the cold wave agent (unit:
wt%)

[0060]

[Table 5] Composition of second agent of cold wave agent (unit:
wt%)

[Example 5] (Preparation of alkaline hair dye containing the first agent of cold wave agent and dyeing of hair using the same) A female monitor in his thirties who desires a deep dyeing power with fashionable dyeing, Example 2 80 g of the hair dye prepared in 3 and the first agent of the cold wave agent prepared based on the composition in Table 4 above in a ratio of 1 was applied to the hair, and the hair was applied at about 45 ° C. for about 5 to 2
Far-infrared heater for 0 minutes (Boomerang: OOHIR Co., Ltd.)
(Made by O) and then left to stand for about 5 to 20 minutes for cooling and then rinsed with warm water. After that, the rod was wound with a rod, and after a suitable time, a cold wave preparation No. 2 prepared based on the composition of Table 5 above was used.
The mixture was neutralized with 80 g of the agent, and after an appropriate period of time, rod-out was performed and rinse treatment with warm water was performed.

From Examples 4 and 5, the hair dye of the present invention (hair dye in the neutral pH range and hair dye in the alkaline pH range of the present invention) is convenient because the wave fixing can be performed at the same time. To be understood.

[0063]

According to the hair dye of the present invention (hair dye in the neutral pH range and hair dye in the alkaline pH range of the present invention),
The dye (acid dye) penetrates into the hair without being adsorbed on the hair surface and the skin and can be dyed in the hair fiber, so that the dye is not discolored, the condition of the hair is reduced and the hair is damaged, and It is possible to provide a safe hair dye for a user without causing skin irritation, and to provide a hair dyeing method using the same. Therefore,
INDUSTRIAL APPLICABILITY The present invention is industrially extremely useful particularly in the field of application of hair dyes.

According to the present invention, a safe hair dye can be supplied to a user, and hair can be safely dyed using such a hair dye.

[Brief description of drawings]

FIG. 1 is an electron micrograph of hair dyed in Example 1.

FIG. 2 is an electron micrograph of hair dyed in Example 2.

FIG. 3 is an electron micrograph of the hair dyed in Comparative Example 1.

FIG. 4 is an electron micrograph of hair dyed in Comparative Example 2.

Claims (8)

[Claims] 1. An acidic dye having a molecular weight of at most 1000, (B) a water-soluble polymer, (C) water and / or a water-soluble organic solvent, and having a pH of 6.5 to 7.5. A hair dye. 2. An acid dye having a molecular weight of at most 1000, (B) a water-soluble polymer, (C) water and / or a water-soluble organic solvent, and (D) a pH adjusting agent. By adjusting the pH of the hair dye, the hair dye is adjusted to pH 7.0 to 11.0. 3. The acid dye has a molecular weight of at most 50.
The hair dye according to claim 1 or 2, which is 0. 4. The hair dye according to claim 1, wherein the water-soluble polymer is a nonionic water-soluble polymer. 5. A hair dye containing (A) an acidic dye having a molecular weight of at most 1000, (B) a water-soluble polymer, (C) water and / or a water-soluble organic solvent, and having a pH of 6.5 to 7.
5. A method for dyeing hair, comprising the step of applying to hair in 5. 6. The acid dye has a molecular weight of at most 50.
The hair dyeing method according to claim 5, wherein the hair dyeing method is 0. 7. A hair dye containing (A) an acid dye having a molecular weight of at most 1000, (B) a water-soluble polymer, (C) water and / or a water-soluble organic solvent, and (D) pH.
A method for dyeing hair, comprising the step of applying a conditioner and applying the hair at pH 7.0 to 11.0. 8. The molecular weight of the acid dye is at most 50.
The hair dyeing method according to claim 7, wherein the hair dyeing method is 0.