JP3425529B2 - Acid hair dye - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an acidic hair dye, and more particularly, to an acidic hair dye having a high dyeing power on hair and imparting a good feel to the hair. . [0002] Hair dyes include temporary hair dyes and permanent hair dyes (including those called semi-permanent hair dyes). Among the latter, oxidation dyes (dye intermediates) are used. There is an oxidized hair dye consisting of a first agent containing an oxidizing agent such as hydrogen peroxide and a second agent containing an oxidizing agent such as hydrogen peroxide, and an acidic hair dye using an acid dye. [0003] The demand for temporary hair dyes is increasing because of their ease of use. However, since temporary hair dyes are discolored by a single shampoo, oxidative dyeing is required when the effect of hair dyeing is to be maintained for a long time. Hair preparations and acidic hair dyes are used. [0004] Oxidative hair dyes are excellent in dyeing power to hair, but are irritating because they contain an alkaline agent or use an oxidizing agent, and damage to the hair during hair dyeing. Due to the violence, the use of acidic hair dyes without using alkali agents or oxidizing agents has recently increased. In this acid hair dye, the acid dye is dissolved in water to show acidity, and the acid dye penetrates into the hair by osmotic action of benzyl alcohol, and the anionic charged acid dye and constituent amino acids are acidified. The acid in the hair coloring material ionically bonds with the cationically charged hair, whereby the acid dye is dyed on the hair and the hair is dyed. [0006] As is apparent from the mechanism of dyeing of an acidic hair dye on hair as described above, in order to enhance the dyeing power of the acid hair dye on hair, how much benzyl alcohol is used to penetrate the acid dye into hair. Is an important point. However, since benzyl alcohol is low in polarity, some kind of stabilizer is required to stably maintain a creamy or the like in a state containing the low-polarity benzyl alcohol and high-polarity water. Become. Therefore, conventionally, ethanol having a polarity between water having a high polarity and benzyl alcohol having a low polarity,
By adding a polyhydric alcohol such as dipropylene glycol, the polarity of the prescription system is stabilized by shifting it toward the water side. However, if a large amount of ethanol, polyhydric alcohol, or the like is added before the prescription system is stabilized, the polarity of the entire system is considerably shifted to the water side, so that the benzyl alcohol penetrates into the hair. As a result, there is a problem that the penetration of the acid dye into the hair is reduced, and the dyeing power is reduced. In addition, since the acidic hair dye is a water-based formulation, it is not possible to add an oil component for imparting a good feeling such as smoothness and softness to the hair, and therefore, imparts a good feeling to the hair. There was also a problem that it was not possible. [0010] The present invention solves the above-mentioned problems of the conventional acidic hair dyes, has a high dyeing power on hair, and can impart a good feel to hair. The purpose is to provide hair. According to the present invention, there is provided an acid dye containing 0.05 to 0.5% by weight of an acid dye, 3 to 7% by weight of an acid and 4 to 8% by weight of benzyl alcohol. In hair, 0.1% of polyoxyethylene lauryl ether was added.
0.2% by weight, 0.3% of light liquid isoparaffin
0.8% by weight, 0.6 to 1.2 parts of polyacrylamide
The above problem has been solved by adding 2 to 7% by weight of ethanol and 2% by weight of ethanol. That is, polyoxyethylene lauryl ether emulsifies benzyl alcohol as a penetrant or an oil which imparts a good feel to hair to prepare an acidic hair dye into a stable creamy dosage form, Gives a good feel to hair as an oil component, and polyacrylamide exerts a thickening action to keep the acidic hair dye in a stable creamy state. Therefore, in the acidic hair dye of the present invention having the above constitution, the addition of ethanol for keeping the acidic hair dye in a stable dosage form can be reduced to the minimum necessary.
As a result, the polarity of the entire prescription system does not shift to the water side, and the penetration effect of benzyl alcohol into the hair is kept good. As a result, the penetration of the acid dye into the hair also improves, and the dyeing power is improved. improves. In addition, since the polarity of the entire prescription system is not too close to the water side, light liquid isoparaffin as an oil component can be added, and a good feel can be imparted to the hair. DESCRIPTION OF THE PREFERRED EMBODIMENTS Polyoxyethylene lauryl ether used in the present invention is a kind of nonionic surfactant and has a function of emulsifying benzyl alcohol and oil. The addition mole number (EO number) of ethylene oxide of ether is preferably 4 EO to 10 EO, particularly preferably 7 EO. In the present invention, the content of the polyoxyethylene lauryl ether in the acidic hair coloring material (the amount to be mixed with the acidic hair coloring material) needs to be 0.1 to 0.2% by weight. When the content of ethylene lauryl ether is less than the above range, the effect of emulsifying benzyl alcohol and oil is not sufficiently exhibited, and when the content of polyoxyethylene lauryl ether is more than the above range, the acid dye to the hair This is because the dyeing power is reduced. Light liquid isoparaffin is used as an oil that imparts a good feeling such as smoothness and softness to hair. In the present invention, the content of this light liquid isoparaffin in an acidic hair dye is 0%. .3-0.
When the content of the light liquid isoparaffin is less than the above range, it is not possible to sufficiently impart a good feeling such as smoothness and softness to the hair. If the content of liquid isoparaffin is more than the above range, the hair will have a sticky feel. Polyacrylamide is a high molecular compound, has a thickening effect, and contributes to keeping an acidic hair dye in a stable creamy state. It has the function of preventing the liquid from dripping. In the present invention, the content of the polyacrylamide in the acidic hair dye must be 0.6 to 1.2% by weight. This is because the content of the polyacrylamide is smaller than the above range. In this case, the effect cannot be sufficiently exhibited, and when the content of polyacrylamide is more than the above range, the hair becomes hard and the elongation during comb operation decreases. Ethanol has the effect of further increasing the dyeing power of the acid dye on the hair. In the present invention, the content of the ethanol in the acid hair dye is 2 to 2.
It must be 7% by weight. This is because when the content of ethanol is less than the above range, the dyeing power of the acid dye on the hair cannot be sufficiently increased, and when the content of ethanol is more than the above range, the penetration effect of benzyl alcohol is hindered. This is because the dyeing power is reduced. Further, the acid hair dye of the present invention requires an acid dye, an acid and benzyl alcohol as in the case of the conventional acid hair dye. May be the same as For example, the acid dyes are not particularly limited, but include black 401, red 102 and yellow 4
No., Red No. 227, Purple No. 401, Blue No. 1, Blue No. 20
No. 5, orange 205, yellow 403-(1), yellow 40
No. 6, Red No. 201 and Green No. 3 are used. In the present invention, the content of the acid dye in the acid hair dye must be 0.05 to 0.5% by weight. If the dye cannot be dyed sufficiently and the content of the acid dye is higher than the above, excessive acid dye adheres to the surface of the hair a lot, and the color drops in daily life increase, and clothes etc. This is because it causes contamination. Acids in acid hair dyes mainly act to make the hair cationic and make it easy for the anionic acid dye to be adsorbed to the hair. Examples of the acid include lactic acid, glycolic acid, citric acid and the like. Acid, malic acid, acetic acid, hydrochloric acid, phosphoric acid, etc. can be used,
Particularly, organic acids such as lactic acid, glycolic acid and citric acid are preferable, and lactic acid is particularly preferable. In the present invention, the content of the acid in the acid hair dye must be 3 to 7% by weight. However, when the content of the acid is smaller than the above, the dyeing power of the acid dye is sufficient. If the acid content is higher than the above, the stability of the acid dye is impaired and the skin becomes more irritating. In the present invention, the content of benzyl alcohol in the acid hair dye must be 4 to 8% by weight. This is because when the content of benzyl alcohol is smaller than the above range, the acid dye is used. This is because the effect of penetrating the hair cannot be sufficiently exerted, so that the dyeing power of the acidic hair dye on the hair is reduced, and when the content of benzyl alcohol is larger than the above range, the skin irritation becomes stronger. The acidic hair dye of the present invention is prepared by dissolving or dispersing the above components in water or a medium mainly containing water. At that time, in addition to the above components, if necessary, for example, high-polymerized polyethylene glycol, carboxyvinyl polymer, silicone oil, ultraviolet absorber,
Sodium hydroxide, hydroxyethanediphosphonic acid, fragrance and the like can be appropriately contained. Next, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to only these examples. Example 1 and Comparative Example 1 A black acidic hair dye having the composition shown in Table 1 was prepared. The unit indicating the blending amount of each component in the table is part by weight, and the same applies to the following tables showing the composition. [Table 1] The acidic hair dyes of Example 1 and Comparative Example 1 obtained as described above were subjected to comparative tests of dyeing power and feel as shown below. First, a description will be given of a comparative test of dyeing power. Dyeing power: 10 g of each of the acidic hair dyes of Example 1 and Comparative Example 1 was applied to a 100% gray hair bundle weighing 1 g each, and then applied at 45 ° C.
For 15 minutes, and then washed with water, washed twice with a commercially available shampoo, further coated with a commercially available hair treatment, rinsed and dried. The L value (brightness value) of the hair bundle after the above hair dyeing treatment was measured with a color difference meter (Color-color difference meter CR-200 manufactured by Minolta Co.). Table 2 shows the results. In this color difference measurement, the smaller the L value, the deeper the dye. [Table 2] As shown in Table 2, Example 1 was a comparative example.
The lightness value was lower and the dyeing power on hair was excellent. Next, a comparison test of the touch will be described. The comparison test of this feeling was performed by the evaluation on the hair bundle and the evaluation on the monitor hair. Evaluation on hair bundles : Hair dyeing treatment was carried out according to the following steps :
30 g of each of the acidic hair dyes of Example 1 and Comparative Example 1 is applied to a human hair black hair bundle weighing 20 g each. 4
Leave at 5 ° C for 15 minutes. Then wash with water. Rinse after washing twice with a commercial shampoo. Apply a commercial treatment and rinse. Dry with a dryer. The feeling was evaluated by five panelists touching the hair bundles during and after the above-mentioned steps by hand, and by the touch. As a result, in all of the five panelists, the hair bundle treated with the acidic hair dye of Example 1 was subjected to the hair dye treatment with the acidic hair dye of Comparative Example 1 during the above process and after the process was completed. The hair bundle treated with the acidic hair dye of Example 1 was evaluated as “better in finger passing” than the hair bundle, and the hair bundle treated with the acidic hair dye of Example 1 was evaluated by all five panelists after the process was completed. It was evaluated as "soft" from a hair bundle that had been dyed with an acidic hair dye. Evaluation on monitor hair: A hair dyeing treatment was carried out by the following steps :
The hair of the monitor is divided in half at the center, and each of the hairs is coated with 70 g of the acidic hair dye of Example 1 and Comparative Example 1 described above. Normally, the hair is heated for 10 minutes with a roller ball and cooled for 5 minutes by an acidic hair dye treatment method in a beauty salon. Then rinse with hot water. Rinse after washing twice with a commercial shampoo. Apply a commercial treatment and rinse. Dry with a dryer. The feeling was evaluated by five panelists touching the hair during and after the above-mentioned process and after the process with the hand, and the touch was evaluated. As a result, in all of the five panelists, the hair dyed with the acid hair dye of Example 1 was subjected to the hair dye treatment with the acid hair dye of Comparative Example 1 in the evaluation during and after the above process. The hair was evaluated as “better finger” than the hair, and all five panelists evaluated the hair dyed with the acidic hair dye of Example 1 in the evaluation after completion of the process. It was evaluated as "softer" than the hair dyed with the hair dye. Example 2 and Comparative Example 2 Brownish acidic hair dyes having the compositions shown in Table 3 were prepared. [Table 3] With respect to the acidic hair dyes of Example 2 and Comparative Example 2 obtained as described above, a touch test was conducted as shown below. As in the case of Example 1, this comparative test was performed by evaluating the hair bundle and evaluating the monitor hair. Evaluation on hair bundle : Hair dyeing treatment was carried out according to the following steps :
30 g of each of the acidic hair dyes of Example 2 and Comparative Example 2 are applied to a human hair black hair bundle weighing 20 g each. 4
Leave at 5 ° C for 15 minutes. Then wash with water. Rinse after washing twice with a commercial shampoo. Apply a commercial treatment and rinse. Dry with a dryer. The evaluation of the touch was performed by touching the hair bundles with the hands of five panelists during and after the above-mentioned steps and after the steps, and the touch was evaluated. As a result, in all of the five panelists, the hair bundle treated with the acid hair dye of Example 2 was subjected to the hair dye treatment with the acid hair dye of Comparative Example 2 during the above-mentioned process and after the completion of the process. The hair bundle treated with the acidic hair dye of Example 2 was evaluated as “better finger passability” than the hair bundle, and the evaluation was performed by all five panelists after the process was completed. It was evaluated as "soft" from a hair bundle that had been dyed with an acidic hair dye. Evaluation on monitor hair: A hair dyeing treatment was carried out by the following steps :
The hair of the monitor was divided in half at the center, and 70 g of each of the acidic hair dyes of Example 2 and Comparative Example 2 was applied to each of them. Normally, the hair is heated for 10 minutes with a roller ball and cooled for 5 minutes by an acidic hair dye treatment method in a beauty salon. Then rinse with hot water. Rinse after washing twice with a commercial shampoo. Apply a commercial treatment and rinse. Dry with a dryer. The evaluation of the feel was performed by touching the hair during and after the above-mentioned steps and by the five panelists with the hands, and the touch was evaluated. As a result, in all of the five panelists, during the above-mentioned process and after the process was completed, the hair treated with the acidic hair dye of Example 2 was subjected to the hair dye treatment with the acidic hair dye of Comparative Example 2. The hair was evaluated as “better finger” than the hair, and the hair treated with the acidic hair dye of Example 2 was more acidic than the hair of Comparative Example 2 in the evaluation after completion of the process by all five panelists. It was evaluated as "softer" than the hair dyed with the hair dye. As described above, according to the present invention, it is possible to provide an acidic hair dye which has high dyeing power on hair and imparts a good feeling to hair.

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-11-130639 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) A61K 7/13

Claims (1)

(57) [Claim 1] 0.05 to 0.5% by weight of an acid dye,
3 to 7% by weight and benzyl alcohol 4 to 8 % by weight
% Of acidic hair dye containing 0.1 to 0.2% by weight of polyoxyethylene lauryl ether , 0.3 to 0.8% by weight of light liquid isoparaffin , and 0.6 to 1.2 % of polyacrylamide. Weight percent and ethanol 2-7
An acidic hair dye characterized by containing by weight .