JP2002121121A - Hair-treating method, after-treatment agent and after- care hair-treating agent - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the damage to hair while preventing the discoloration and over-astringence of hair by removing residual alkali. SOLUTION: Hair is dyed with an oxidizing hair-dye containing an alkaline agent to obtain dyed hair having pH of 8-10 in the hair. The hair-dye is washed off from the dyed hair and the hair is coated with an after-treatment agent having a pH of 3-5.5 as 10 wt.% aqueous solution, left to stand and washed to remove the after-treatment agent and adjust the pH in the hair to about 8 (the primary care). The hair is treated plural times with an after-care hair- treating agent having a pH of 3.5-6.5 as 10 wt.% aqueous solution to adjust the pH in the hair to the isoelectric point of the hair (pH 6) or thereabout (the secondary care).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating hair after it has been dyed with an oxidative hair dye, an after treatment agent and an after care hair treatment agent.

[0002]

2. Description of the Related Art Hair dyes include permanent hair dyes and semi-permanent hair dyes, all of which are widely and generally used for cosmetic purposes. Among permanent hair dyes, oxidized hair dyes comprising a first agent containing an oxidation dye and an alkali agent and a second agent containing hydrogen peroxide are widely used due to their hair dyeing power, fading performance and the like. .

[0003] Such an oxidative hair dye generally contains an alkaline agent to help uniform penetration, so that the pH is high, so that the hair is liable to be damaged. There is a drawback that damage is further promoted due to contact with an excessive amount of an alkaline agent, influence of a residual alkaline agent, and the like, resulting in poor touch and poor color durability. Various hair treatment agents are generally used for hair coloring hair to reduce the damage.

For example, Japanese Patent Application Laid-Open No. 2-212410 discloses conditioning of alkali-treated hair after the hair is alkali-treated and returned to an isoelectric point (pH 6) to repair hair damage and suppress hair deterioration damage. A composition is disclosed. This conditioning composition comprises p
H-buffer, protein hydrolyzate, and amino-modified silicone, and the hair treated with this composition has pH 4-7.
It is blended so as to return to the pH value.

[0005]

However, the above-mentioned conditioning composition sharply lowers the pH in the hair from the alkaline side to near the isoelectric point of the hair, and may cause discoloration and excessive convergence of the hair. In other words, after the hair is dyed, the alkaline component remaining in the hair is a major factor that damages the hair, so it is necessary to remove the residual alkali. If the pH value of the slanted hair is rapidly returned, there is a problem that the discoloration and excessive convergence of the hair are caused.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and it is an object of the present invention to provide a hair treatment method for suppressing hair damage by removing residual alkali while preventing discoloration and excessive convergence of hair. And Another object of the present invention is to provide an after treatment agent and an after care hair treatment agent suitable for this hair treatment method.

[0007]

Means for Solving the Problems, Embodiments of the Invention, and Effects of the Invention The present inventors have conducted intensive studies in order to solve the above problems, and as a result, have found that an oxidized hair dye containing an alkali agent is obtained. This hair dye is washed away from the hair whose pH in the hair becomes 8 to 10 by the hair dyeing, and then an after treatment agent having a pH of 3 to 5.5 of a 10% by weight aqueous solution is applied to the hair. Then, a hair treatment method of the present invention was found in which the pH in the hair was adjusted to 7.5 to 9 by washing away after standing. According to this hair treatment method, it is possible to remove residual alkali while preventing discoloration and excessive convergence of the hair, thereby suppressing damage to the hair.

In the present invention, the oxidation type hair dye includes, for example, a first agent containing an oxidation dye and an alkali agent;
And a second agent containing an oxidizing agent.
Here, regarding the first agent, the oxidation dye is not particularly limited, but for example, paraphenylenediamines, paratoluylenediamines, aminophenols,
Examples include aminonitrophenols, diphenylamines, diaminophenylamines, N-phenylphenylenediamines, diaminopyridines and the like, and salts thereof. The compounding amount is, for example, 0.01 to 10% by weight based on the total weight of the first agent. Examples of the alkali agent include, but are not particularly limited to, for example, ammonia, triethanolamine, diethanolamine, monoethanolamine, isopropanolamine, diisopropanolamine, 2-amino-2-methyl-1-propanol, Examples thereof include amino-2-methyl-1,3-propanediol, and one or more selected from these are used. Thereby, the pH of the first agent is adjusted to 8 to 11. Further, as the coupler, pyrogallol, catechol, metaphenylenediamine, or the like may be blended, or those described in “Quasi-drug Raw Material Standards” (Yakuji Nippo, issued in June 1991), acid dyes, , Carboxymethylcellulose, xanthan gum,
In addition to thickeners such as polyacrylic acid and salts thereof, silicone and fragrance may be blended. On the other hand, regarding the second agent, the oxidizing agent is not particularly limited,
Examples include hydrogen peroxide and urea peroxide. Also,
Stabilizers such as phenacetin and EDTA, nonionic surfactants, anionic surfactants, cationic surfactants, amphoteric surfactants, cationized polymers, higher alcohols, hydrocarbons, fatty acids, waxes, fats and oils, Solvents, acids,
A pH adjuster, a fragrance, and the like may be appropriately added as necessary. The pH of the second agent is adjusted to 2 to 5 with an acid.

When this hair dye is used, the first agent and the second agent are mixed at a ratio of 3: 1 to 1: 3 and applied to the hair immediately before the hair dyeing treatment. The pH at the time of use is 8-10. In the present invention, when washing away the hair dye, for example, it may be simply washed off with warm water, but may be washed off with a shampoo, or may be washed off after emulsification with plain rinse, and when plain rinse is used. May then be washed off with shampoo.

In the present invention, a 10% by weight aqueous solution having a pH of 3 to 5.5 is used as an after treatment agent. If the pH is lower than 3, the effect of removing the residual alkali in the hair is high, but the decomposition of the dye is started and the effect on the color tone is undesirably increased. On the other hand, if the pH is higher than 5.5, the effect of removing residual alkali cannot be sufficiently obtained, which is not preferable.

The after-treatment agent preferably contains an organic acid or a salt thereof or an inorganic acid or a salt thereof. The organic acid and the inorganic acid are not particularly limited as long as they are usually used in cosmetics. Examples of the organic acid include citric acid, acetic acid, glycolic acid, formic acid, levulinic acid, oxalic acid, and lactic acid. , Tartaric acid, lactic acid, succinic acid, malic acid, L-glutamic acid, L-aspartic acid, pyrrolidone carboxylic acid, and the like. Examples of the inorganic acids include hydrochloric acid, phosphoric acid, and the like. Among these, organic acids, especially tartaric acid, lactic acid, citric acid,
Preference is given to levulinic acid, glycolic acid and pyrrolidonecarboxylic acid, of which tartaric acid is particularly preferred. The compounding amount of the acid is not particularly limited, but is 0.5 to 5% by weight.
Is preferred.

Further, the after-treatment agent comprises:
Those containing an alkaline agent are preferred. The alkali agent is not particularly limited as long as it is an inorganic alkali or an organic alkali usually used in cosmetics. Examples of the inorganic alkali include hydroxides and carbonates of alkali metals such as sodium hydroxide and potassium hydroxide. Examples of the organic alkali include volatile alkaline agents such as morpholine, triethanolamine, diethanolamine, isopropanolamine, diisopropanolamine, monoethanolamine, 2-ethanolamine, and the like.
Amino-2-methyl-1-propanol, 2-amino-
Alkanolamines such as 2-methyl-1,3-propanediol; amino acids such as L-arginine and lysine; and guanidine carbonate. Among these, sodium hydroxide, L-arginine, ammonia,
Aminomethylpropanol is preferred, and L-arginine is particularly preferred.

In addition, a protein derivative or an amino acid may be added to the after-treatment agent for the purpose of improving the repairing effect and the dye fixability. As such protein derivatives, for example, keratin, wheat, collagen,
It is preferable to use a hydrolyzed protein derivative derived from a protein such as soybean, and as the amino acid, it is preferable to use, for example, an amino acid constituting hair. Further, within the range not hindering the effects of the present invention, a stabilizer, a nonionic surfactant, an anionic surfactant, a cationic surfactant, an amphoteric surfactant, an oil agent, a thickener, a cationized polymer, silicon Derivatives, organic solvents, UV inhibitors, fragrances,
A chelating agent, an antibacterial agent, a plant extract, and the like may be appropriately added as necessary. Further, the dosage form is not particularly limited, liquid, lotion, foam, aerosol,
Any form used for cosmetics, such as cream or solid, may be used.

In the present invention, the after-treatment agent is applied to the hair and allowed to stand, and the leaving time at this time is preferably, for example, 1 to 20 minutes. If it is less than 1 minute, the residual alkali may not be sufficiently removed, so that it is not preferable. In addition, at the time of standing, it may be at room temperature, or may be heated to about 40 to 50 ° C in some cases. However, in consideration of the trouble of heating, it is preferable to leave at room temperature. Then, after being left in this manner, the pH in the hair is adjusted to 7.5 to 9, particularly 7.5 to 8.5 by washing away the after-treatment agent. In other words, by dyeing the hair with an oxidative hair dye, the pH becomes 8 to
Immediately after hair dyeing by lowering the pH in the hair which became 10 by 1 to 2 and moderately controlling the acid treatment, and controlling to an ideal point (around pH 8 in the hair) which does not cause discoloration or excessive convergence of the hair. Ideally maintain hair color and condition. On the other hand, if the pH in the hair is lower than the lower limit, discoloration or excessive convergence of the hair may occur, which is not preferable. If the pH is higher than the upper limit, damage due to residual alkali accumulates.

In the present invention, after the pH in the hair is adjusted to 7.5 to 9 as described above, the pH of a 10% by weight aqueous solution is adjusted.
It is preferable to adjust the pH in the hair to a value near the isoelectric point of the hair (pH 5.5 to 6.5) by treating the hair several times with an aftercare hair treatment agent having H of 3.5 to 6.5. Here, examples of the aftercare hair treatment agent include shampoo, rinse, conditioner, treatment and the like. In order to adjust the pH in the hair to around the isoelectric point of the hair by repeating the treatment with the aftercare hair treatment agent a plurality of times, preferably at least three times, particularly preferably at least five times, alkalis in the hair are taken over time. Remove without difficulty,
While preventing accumulation of damage due to residual alkali,
Even if the hair is repeatedly dyed, the hair can be brought close to the original condition. In addition, the treatment with the aftercare hair treatment agent,
It is preferable to carry out once a day for a plurality of days.

The aftercare hair treatment agent preferably contains an organic acid or a salt thereof, or an inorganic acid or a salt thereof. Further, those containing an alkali agent are preferred. As the organic acid, the inorganic acid, and the alkali agent, the same as those for the after treatment agent may be used. However, since the aftercare hair treatment agent is applied a plurality of times to remove the residual alkali, it preferably has a weaker alkali removal ability than the aftertreatment agent. Therefore, it is preferable that the pH is not so acidic as that of the after-treatment agent.
It is preferred that the pH be 4.5, and the pH of a 10% by weight aqueous solution of the aftercare hair treatment agent be 4 to 6.5. Further, the amount of the organic acid or inorganic acid is preferably equal to or less than that of the after treatment agent.

Here, an example of a recovery curve of the pH in hair when the hair treatment method of the present invention is applied is shown in FIG. 1 in comparison with a conventional example. FIG. 1 is a graph showing a recovery curve of pH in hair. In FIG. 1, when no special treatment is performed after the hair is dyed, the pH in the hair is high due to the remaining alkali, and damage to the hair is undesirably accumulated, as indicated by the dashed line. In addition, when the conventional treatment method is applied after application of the hair dye, the residual alkali is removed, as shown by the dotted line, so that the accumulation of damage is avoided, but the pH in the hair inclined to alkalinity is rapidly increased. It is not preferable because excessive acid treatment to restore the color may cause hair discoloration and excessive convergence. In contrast, when the hair treatment method of the present invention is applied, as shown by the solid line, acid treatment is suppressed moderately immediately after hair dyeing, which is an ideal point that does not cause discoloration or excessive convergence of hair. The pH is controlled to around pH 8, and then the pH in the hair is controlled to around the isoelectric point of the hair for several days. In other words, the alkali in the hair is removed little by little over a few days immediately after the hair dyeing to avoid accumulation of damage. As a result, even if the hair is repeatedly dyed, the hair can be brought close to the original state, and a good condition can be maintained. In FIG. 1, for convenience, processing performed immediately after hair dyeing is referred to as primary care, and processing performed for several days immediately after hair dyeing is referred to as secondary care (the same applies hereinafter).

[0018]

Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. [%] In Examples and Comparative Examples indicates [% by weight] unless otherwise specified.

[1] Hair dyeing treatment The first and second oxidized hair dyes shown in Table 1 were mixed in the same amount, and the mixture was applied to a hair bundle in an appropriate amount.
C.) for 20 minutes. The hair bundle used was virgin hair of a Japanese woman (hair having no hair color and no perm experience) having a length of 15 cm.

[0020]

[Table 1]

[2] Investigation of the Effect of Primary Care The hair bundle after the above hair dye treatment was shampooed to wash away the hair dye, and any of Examples 1 to 3 and Comparative Examples 1 and 2 shown in Table 2 After treatment agent was applied in an appropriate amount, left for 3 minutes and then washed away (primary care). Thereafter, the hair bundle is dried, and 1 g of the hair is freeze-ground with liquid nitrogen to 1 mm or less, and immersed in 100 ml of 50 ° C. distilled water for 10 minutes.
After cooling to 25 ° C., the pH of the aqueous solution was measured, and this was taken as the pH in the hair. Table 2 shows the results.

[0022]

[Table 2]

The hair bundle after the primary care was examined for (1) the degree of discoloration of the hair, (2) the effect of suppressing fading, and (3) the effect of suppressing damage. (1) Degree of Discoloration of Hair The hair bundle after the primary care was dried, and the degree of discoloration of the hair was visually judged by ten specialized panelists. Here, the degree of discoloration was determined in comparison with the hair (untreated hair) when purified water was used as an after treatment agent. Table 2 shows the results. In Table 2, “○” indicates no discoloration, “△” indicates slight discoloration, and “×” indicates discoloration.

(2) Effect of inhibiting fading The hair bundle after the primary care was dried, immersed in a 1% aqueous solution of sodium lauryl sulfate at 50 ° C. for 10 minutes, dried, and visually judged by ten professional panelists. . Also in this case, the discoloration inhibiting effect was judged by comparing with the hair (untreated hair) using purified water as an after treatment agent. Table 2 shows the results
Shown in In Table 2, “◎” indicates that the color retention is considerably better than that of the untreated color, “「 ”indicates that the color retention is slightly better than that of the untreated color,“ △ ”indicates the same as that of the untreated color, and“ × ” Is worse than untreated.

(3) Damage Suppressing Effect The hair bundle after the primary care was dried, and ten special panelists evaluated the feeling of touch such as stickiness and smoothness. Table 2 shows the results.
In Table 2, “◎” indicates that the texture is considerably better than untreated, “処理” is slightly better than untreated, “△” is the same as untreated, and “×” is untreated. Worse than.

From Table 2 above, when the pH in the hair after the primary care was 6.5, the hair was discolored due to excessive acid treatment, and a sufficient fading inhibiting effect was not obtained (Comparative Example 1). .
When the pH in the hair after the primary care was 9.0, no discoloration of the hair was observed, but the residual alkali was not removed, and no fading inhibiting effect was obtained (Comparative Example 2). On the other hand, when the pH is around 8.0, moderate acid treatment does not cause discoloration or excessive convergence of the hair, and shows good results in both the degree of discoloration of the hair and the effect of suppressing fading. Was obtained (Examples 1 to 3). In particular, when a protein derivative (hydrolyzed wheat protein) was used in combination, the effect of suppressing fading was extremely good (Example 3).

[3] Investigation of the effects of primary care and secondary care The effects of primary care and secondary care were investigated. That is, the hair bundle after the hair dyeing treatment was shampooed to wash away the hair dye, the after-treatment agent of Example 3 was applied in an appropriate amount, left for 3 minutes, and then washed off (primary care). The pH in the hair after the primary care was 7.5 as shown in Table 2.
Then, from the next day, the shampoo and the rinse (aftercare hair treatment agent) of any of Example 4 and Comparative Examples 3 and 4 shown in Table 3 were washed once daily for 5 days (secondary care). . Thereafter, the hair bundle is dried, and 1 g of the hair is freeze-pulverized with liquid nitrogen to 1 mm or less, and 50 ° C.
Immersed in 100 ml of distilled water for 10 minutes, cooled to 25 ° C., the pH of the aqueous solution was measured, and this was taken as the pH in the hair. Table 3 shows the results.

[0028]

[Table 3]

The degree of discoloration and the effect of suppressing damage were examined using the hair bundles subjected to primary care and secondary care.
That is, the hair bundle after the secondary care was dried, and the degree of discoloration as compared with the color tone immediately after the hair dyeing was visually judged by ten specialized panelists. Table 3 shows the results. In Table 3, "○"
Indicates no discoloration, “、” indicates a slight discoloration, and “×” indicates a discoloration.

The hair bundle after the secondary care was dried, and ten special panelists evaluated the feeling of touch such as stiffness and smoothness. Table 3 shows the results. In Table 3,
“◎” is considerably better than untreated, “○” is slightly better than untreated, “△” is not different from untreated, “×” is worse than untreated. .

From Table 3 above, when the pH in the hair after the secondary care is 4.5, the color is discolored as compared to immediately after the hair dyeing (Comparative Example 3), while the pH in the hair after the secondary care is increased. pH 7.3
In the case of (1), damage was accumulated on the hair due to insufficient removal of the residual alkali (Comparative Example 4). In contrast, 2
If the pH in the hair after the next care is 6.0, it means that the alkali in the hair has been removed little by little over a few days immediately after the hair dyeing, so that accumulation of damage can be avoided and excessive oxidation No discoloration was observed (Example 4). That is, if the third embodiment is adopted as the primary care and the fourth embodiment is adopted as the secondary care, p close to the solid line in FIG.
An H recovery curve is obtained, and the hair can be brought close to the original state even when the hair is repeatedly dyed, and a good condition can be maintained.

[Brief description of the drawings]

FIG. 1 is a graph showing a recovery curve of pH in hair.

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Claims (7)

[Claims] 1. A hair dyeing with an oxidized hair dye containing an alkaline agent, the pH of which has been adjusted to 8 to 10 in hair, the hair dye is washed off, and then a 10% by weight aqueous solution A hair treatment method, wherein an after treatment agent having a pH of 3 to 5.5 is applied to hair, and the pH in the hair is adjusted to 7.5 to 9 by leaving the hair to stand and then washing it away. 2. A hair dyeing with an oxidized hair dye containing an alkali agent, the pH of the hair having been adjusted to 8 to 10 is washed away from the hair, followed by a 10% by weight aqueous solution. The after-treatment agent having a pH of 3 to 5.5 is applied to the hair, and the pH in the hair is adjusted to 7.5 to 9 by leaving the hair, and then the pH of the 10% by weight aqueous solution is adjusted to 3.5 to 9. A hair treatment method comprising adjusting the pH in the hair to 5.5 to 6.5 by treating it multiple times with the aftercare hair treating agent of 6.5. 3. The hair treatment method according to claim 2, wherein the pH in the hair is adjusted to 5.5 to 6.5 by treating the hair with the aftercare hair treating agent at least three times. 4. The aftercare hair treatment agent has a pH of 10% by weight aqueous solution more than that of the aftertreatment agent.
The hair treatment method according to claim 2, wherein the hair treatment is high. 5. The aftercare hair treatment agent has a 10% by weight aqueous solution having a pH of 4 to 6.5, and the aftertreatment agent has a 10% by weight aqueous solution having a pH of 3 to 4.
The hair treatment method according to claim 4, wherein 6. An after treatment agent used in the hair treatment method according to claim 1. 7. An aftercare hair treatment agent used in the hair treatment method according to any one of claims 2 to 5.