JPH0676304B2 - Hair color remover - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a hair bleaching agent, and more specifically, it has excellent bleaching power, which is used for bleaching hair in hair dyeing and the like, and
The present invention relates to a hair bleaching agent with improved hair damage and skin irritation.

BACKGROUND OF THE INVENTION Various hair bleaching agents have been known from the past, and many of them utilize the bleaching force of nascent oxygen generated from hydrogen peroxide. An alkaline agent is added to promote and enhance bleaching power. That is, since the oxygen generation amount in the nascent stage shows a pH dependency that it rapidly increases when the pH becomes 9 or more, in consideration of the stability of hydrogen peroxide, it is usually made into two dosage forms and the pH of 1 to 7 is used. To the first agent containing hydrogen oxide, the second agent is blended with ammonia, sodium hydroxide or an alkaline agent such as mono-, di- or trialkanolamine so that the pH becomes about 9-11 at the time of use. It is used as a mixture of both agents. In the pH range, the hair is swollen by the free alkali present, and the permeation of hydrogen peroxide or nascent oxygen into the hair is promoted, and the contribution to the improvement of the bleaching power by that is not to be overlooked. There are several problems with the use of depigmenting agents.

First, in general, hair damage occurs due to high pH, and at the same time, irritation to the skin is also observed. Individually, for example, when volatile ammonia is blended, there is a problem that irritation to the mucous membranes of the eyes and nose is accompanied by discomfort, and it is difficult to impart a fragrance with a fragrance. In addition, non-volatile,
When di- or triethanolamine is incorporated, they tend to remain on the hair, resulting in loss of gloss on the hair, reduced tensile strength, and dryness after use.

In addition, the conventional bleaching treatment using an alkaline agent-containing hair bleaching agent usually takes 30 to 60 minutes, which is a relatively long time, and it is not suitable for a modern sense of life in which everything is speedy. Therefore, the advent of hair bleaching agents having stronger bleaching power is desired.

In view of such circumstances, the inventors have made diligent efforts to obtain a hair bleaching agent with less hair damage and various irritation to the human body at the time of use, and a short time required for bleaching treatment. It was found that the presence of a specific ion in the pH range of 4 to 8 unexpectedly increases the amount of oxygen generated during the nascent period and can increase the bleaching power, as compared with the case of using hydrogen peroxide alone, and the present invention was found. Was completed.

DISCLOSURE OF THE INVENTION The present invention discloses that HCO ₃ ⁻ and HPO ₃ are dissociated in water as essential components.
^{_{4 2-, H 2 PO 4 -}} , HSO 4 -, HSiO 3 - or HBO ₄ ^- and with one or more ions, contain components for generating nascent oxygen, with an alkaline agent-free formulation, The present invention provides a novel hair bleaching agent having a pH of 4-8. The hair bleaching agent of the present invention has a pH of 4 to 4 without using an alkaline agent.
By setting 8, the damage to the hair and irritation to the human body are alleviated, while the action of the ions makes it possible to increase the amount of oxygen in the nascent stage as compared with the case of simply using hydrogen peroxide, and the bleaching of the hair. You can increase your strength.

As an essential component in the present invention, a combination of hydrogen peroxide and a compound that produces the ion is used. Examples of the ion-generating compound include compounds that generate HCO ₃ ⁻ , such as Na ₂ CO ₃ , NaHCO ₃ , K ₂ CO ₃ , KHCO ₃ , (NH ₄ ) ₂ CO ₃
And a compound selected from the group consisting of NH ₄ HCO _3, etc., HPO
For producing ₄ ²⁻ or H ₂ PO ₄ ⁻ , for example, NaP
O ₄ , Na ₂ HPO ₄ , NaH ₂ PO ₄ , K ₃ PO ₄ , K ₂ HPO ₄ , KH ₂ PO ₄ , (N
_{H 4) 3 PO 4, (} NH 4) 2 HPO 4 and NH ₄ H compound selected from the group consisting etc. ₂ PO _4, HSO ₄ ^- for example as _{generating, Na 2 SO 4, NaHSO 4} , K _{2 SO 4, KHSO 4, (} NH 4) 2 SO 3 and NH ₄ HSO compound selected from the group consisting etc. _4, HSiO ₃ ^-
To generate, for example, Na ₂ SiO ₃ , NaHSiO ₃ , Na ₆ S
i ₂ O ₇ , Na ₂ Si ₃ O ₇ , K ₂ SiO ₃ , K ₆ Si ₂ O ₇ , K ₂ Si ₃ O ₇ , KHSiO ₃ ,
(NH ₄ ) ₂ SiO ₃ , (NH ₄ ) ₆ Si ₂ O ₇ , NH ₄ HSi ₃ O and (NH ₄ )
A compound selected from the group consisting of ₂ Si ₃ O _{7 and the} like; and HBO ₄
^- for example as _{generating, NaBO 3, NaHBO 4, KBO} 3,
There may be mentioned compounds selected from the group consisting of KHBO ₄ , NH ₄ BO ₃ and NH ₄ HBO ₄ . In addition, sodium percarbonate (3H ₂ O
Those having the above-mentioned ion-forming compound and hydrogen peroxide as composition components such as ₂ · 2Na ₂ CO ₃ ) can be used alone as an essential component of the hair decolorizing agent of the present invention.

Hydrogen peroxide, the above-mentioned ion-generating compound and the like are all commercially available, and they can be used in the present invention.

The hair bleaching agent of the present invention can be made into two dosage forms when a hydrogen peroxide and an ion generating compound are combined, and can be made into one dosage form when a compound containing both components is used. In a two-dosage form, hydrogen peroxide is usually added in an amount of 0.1
-6%, preferably 1-6%, and the ion-generating compound is 0.1-30%, preferably 1-20%, based on the total amount of the second agent. In one dosage form, the composition component compounds are usually compounded in a proportion of 1 to 20% based on the total amount.

Mixing molar ratio of hydrogen peroxide and ion-generating compound is 1/20 to 20
The range of / 1 is appropriate, and outside this range, the bleaching force decreases and approaches the level of hydrogen peroxide alone.
The blending molar ratio is preferably 1/5 to 5/1.

The hair bleaching agent of the present invention has a pH of 4-8, preferably 6-8.
Ranged. In other ranges, the bleaching power decreases as described below, and at pH 8 and above, free alkali is present to cause hair damage, while at pH 4 and below, acidity is strong and inappropriate.

Thus, in the two-dose form, a preselected amount of each component is included in a separate agent, optionally an acidic pH adjusting agent such as citric acid, phosphoric acid, hydrochloric acid, etc. Both agents are mixed in proportions to achieve the compounding ratio and pH within the above range. In the case of one dosage form, from the present point of view, the compounding amount is within the range, and if necessary, an appropriate amount of acidic pH adjusting agent is contained.

The hair decolorizing agent of the present invention can be made into various forms by a conventional method such as shampoo type and treatment type. In the two-dose form, both agents may be powders such as aqueous solutions, emulsions, creams, pastes, gels, etc., containing ion-generating compounds, and as a combination, for example, the first agent is hydrogen peroxide and pH adjustment. Examples of the aqueous solution include an agent, a second agent that is a powder including an ion-generating compound, and a solution in which both agents are non-aqueous.
The above-mentioned various forms are possible even in one dosage form, and typically, a powdery form comprising sodium percarbonate and a pH adjusting agent can be mentioned. Compounding ingredients other than the essential ingredients are not particularly limited, various solubilizers, emulsifiers, solvents,
Wetting agent, sequestering agent, foaming agent, foaming aid, oil, wax, hydrocarbon, fatty acid, alcohol, polyhydric alcohol,
Ester oil, fragrance and the like can be appropriately combined and blended.

The hair bleaching agent of the present invention can be used in the same manner as a conventional hair bleaching agent, for example, by mixing the first agent and the second agent,
Alternatively, in the case of one dosage form, it is diluted with water, uniformly applied to the hair, left for about 10 minutes, then lightly rinsed and shampooed.

Effects of the Invention The effects of the present invention will be described below.

[1] Bleaching Force FIGS. 1 and 2 of the accompanying drawings are graphs showing the relationship between pH and bleaching force in the case of hydrogen peroxide alone and in the coexistence of hydrogen peroxide and an ion-forming compound.

As the ion-generating compound, Na ₂ CO ₃ , NaHCO ₃ , NaHCO ₃ ,
KH ₄ HCO ₃ , Na ₂ HPO ₄ , NaHSO ₄ , NaHSiO ₃ and NaHBO ₄ are selected, and in each case including hydrogen peroxide alone, a pH adjuster (phosphoric acid or as a comparative example, when the pH exceeds 8) Was used as a bleach test solution by adjusting the desired pH by adding an appropriate amount of monoethanolamine). In either case,
The concentration in the bleach test solution was 0.89 mol / for hydrogen peroxide and 0.59 mol / for each ion-generating compound. For bleaching, the bath ratio was set to bleach test solution: hair (Japanese chemically untreated hair) = 50g: 1g, and 26 ±
It was carried out at 1 ° C for 30 minutes. As an index of bleaching power, the decolorization rate (%) calculated according to the following formula was used by calculating the corresponding lightness of untreated Japanese white hair and Japanese black hair and bleached hair using a spectrophotometric color difference meter. .

x: Corresponding lightness of Japanese gray hair y: Corresponding lightness of Japanese black hair z: Corresponding lightness of bleached hair As shown in the graphs of FIGS. 1 and 2, pH 4 to
The bleaching force in the presence of each ion-generating compound in 8 is the same.
Much higher than the bleaching power of hydrogen peroxide alone in the pH range, and Na ₂ CO ₃ and NaHC in the pH 6-8
The bleaching force in the presence of O ₃ , NH ₄ HCO ₃ or NaHBO ₄ is pH 9-11.
The increased bleaching power in the case of increased hydrogen peroxide alone (corresponding to the conventional alkaline compounded hair bleaching agent) in. Thus, it can be seen that the hair bleaching agent of the present invention is superior in bleaching power to the conventional hydrogen peroxide type hair bleaching agent containing an alkaline agent.

[2] Damage to hair Using the bleach test liquid formulated in the following mixing ratio, the hair was treated according to the treatment method described below, and a hair damage evaluation test was performed.

<Bleach test liquid> Component A liquid B liquid Hydrogen peroxide solution (35%) 8.6% by weight 8.6% by weight Ammonia water (28%) 6.0-Phosphoric acid-0.06 Ammonium hydrogen carbonate-4.6 Purified water 85.4 86.74 Liquid A is conventional It corresponds to the product and the pH is 10.5, and the solution B corresponds to the present invention and the pH is 7.2.

<Treatment method> Bath ratio: Bleach test liquid 50 g: Hair (Japanese compound untreated hair) 1 g Bleach treatment condition: Hair is immersed in water at 26 ± 1 ° C. or bleach test liquid for 30 minutes. Then rinse with water and dry. The above operation is repeated 3 times.

<Analysis of protein elution amount> Collect all the bleach dipping solutions and washing solutions rinsed with water in the bleaching process, and evaporate the water to use as analytical data. Using this material, quantify the amount of protein eluted by high performance liquid chromatography.

The results are shown in the graph of FIG.

As is clear from the graph of FIG. 3, when the hair was treated with the solution B of the present invention, the amount of protein elution was much smaller than when treated with the conventional solution A, and therefore the hair to be used was damaged. You can see that the degree is small.

[3] Time required for bleaching treatment As described above, in the hair bleaching agent of the present invention, the bleaching power (oxygen generation amount in the nascent period) can be changed and adjusted by changing the type, compounding ratio, pH and the like of the ion generating compound. ,
The required bleaching time can be adjusted accordingly. Usually, the treatment time can be selected within the range of 5 to 60 minutes, and the treatment time within the range of 10 to 30 minutes can be said to be considerably shortened compared to the conventional product, which is the sense of life of modern people in a speedy manner. Is suitable for.

As described in the above [1] to [3], the hair bleaching agent of the present invention is a useful hair bleaching agent having excellent bleaching power, less damage to the hair, and shorter treatment time. Moreover,
Since the pH range can be adjusted to 4 to 8 without using an alkaline agent, irritation to the skin is alleviated, and there is no discomfort caused by an irritating odor, which is the case when an alkaline agent such as ammonia is used.

Hereinafter, the present invention will be described in more detail with reference to examples.

Example 1 According to the following formulation, a hair bleaching agent of the present invention in a two-form formulation in which the first agent was a powder and the second agent was a liquid was obtained by a conventional method.

First agent; Ammonium hydrogen carbonate (powder) 100% Second agent formulation; Component weight% Hydrogen peroxide water 8.5 Citric acid Appropriate amount Purified water 91.5 To use this two-form hair bleaching agent, for example, first agent;
The second agent is mixed at a ratio of 5: 100 (pH 7.0 at the time of mixing). Apply this evenly on the hair, leave it for about 10 minutes, and rinse with hot water. It is then shampooed and dried to achieve a suitable decolorization.

Example 2 According to the following formulation, a hair bleaching agent of the present invention in the form of powder 1 was obtained by a conventional method.

Formulation:% by weight Propoxymethylcellulose 10 Sodium percarbonate (3H ₂ O ₂ · 2Na ₂ CO ₃ ) 90 Citric acid Suitable amount To use this 1-form hair bleaching agent, for example, this product: water = 6: 100 Dilute this product (pH 6.5 when diluted). Apply this evenly on the hair, leave it for about 10 minutes, and rinse with hot water. It is then shampooed and dried to achieve a suitable decolorization.

Example 3 A hair bleaching agent of the present invention in a non-aqueous gel 2 dosage form was obtained by a conventional method according to the following formulation.

1st formulation: component weight% propylene glycol 6.0 stearyltrimethylammonium chloride 5.0 squalane 10.0 olive oil 10.0 liquid paraffin 56.5 isopyrupyl palmitate 5.0 disodium hydrogen phosphate 7.5 second formulation: component weight% hydrogen peroxide solution (35%) 3.0 Polyoxyethylene (2) nonylphenyl ether 0.5 Polyoxyethylene (10) nonylphenyl ether 0.5 Polyoxyethylene (40) cetyl ether 0.5 Cetanol 2.0 Ethylene glycol monostearate 2.0 EDTA ・ Disodium 0.1 Phosphoric acid Appropriate amount of purified water 91.4 To use this non-aqueous gel 2 dosage form hair bleaching agent, for example, mix in the ratio of 1st agent: 2nd agent = 1: 2
7.5). Apply this evenly on your hair and leave it for about 10 minutes.
Rinse with hot water. It is then shampooed and dried to achieve a suitable decolorization.

[Brief description of drawings]

1 and 2 are graphs showing the relationship between pH and bleaching force in the case of hydrogen peroxide alone and in the presence of hydrogen peroxide and an ion-generating compound. FIG. 3 is a graph showing the comparison results of protein elution amounts.

Claims (5)

[Claims] 1. A as an essential component, HCO ₃ dissociates in water ^-, H
One of PO ₄ ²⁻ , H ₂ PO ₄ ⁻ , HSO ₄ ⁻ , HSiO ₃ ⁻ or HBO ₄ ⁻ ions
A hair depigmenting agent comprising one or two or more kinds of ingredients and a component that generates nascent oxygen and containing no alkaline agent and having a pH of 4 to 8. 2. The hair bleaching agent according to claim 1, wherein the component is hydrogen peroxide and a combination of one or more compounds that generate the ions. 3. The hair bleaching agent according to claim 1, wherein the ion is HCO ₃ ⁻ . 4. The compound producing the ion is NaHCO ₃ , NH ₄ H.
The hair bleaching agent according to claim 3, which is selected from the group consisting of CO ₃ , Na ₂ CO ₃ and (NH ₄ ) ₂ CO ₃ . 5. The hair depigmenting agent according to claim 1, which has a pH of 6-8.