JP4551854B2 - Hair dyeing method - Google Patents

Description

  The present invention relates to a hair dyeing method for dyeing hair using an oxidative hair dye composition containing an alkali agent, a dye and an oxidizing agent, and particularly to a hair dyeing method capable of suppressing damage applied to hair due to hair dyeing. .

  Conventionally, with respect to a hair dyeing method using an oxidative hair dye composition, a high alkaline oxidative hair dye composition obtained by adding a high concentration (6%) hydrogen peroxide solution to an alkali color agent is usually applied to hair. Leave it for about 30 to 40 minutes, and then apply to the hair an oxidative hair dye composition in which a low-concentration (2%) hydrogen peroxide solution is added to a slightly alkaline color agent having a lower alkalinity than the alkali color agent. A method of removing the oxidative hair dye composition by washing with water for 10 to 15 minutes and then washing with water is performed. In the case of white hair dyeing, an alkali color agent, rarely a low alkali color agent, is used instead of the slightly alkali color agent. According to this hair dyeing method, hair is swollen by an alkali color agent, hydrogen peroxide entering the hair decomposes the melanin pigment to increase the lightness of the hair, and further, the dye is oxidized by hydrogen peroxide and develops color. And you can dye your hair.

  By the way, since the alkali color agent has a large swelling action, the melanin component in the hair easily flows out from the gaps between the open cuticles, and there is a problem that damage to the hair increases. Moreover, since the alkaline color agent has a strong irritating odor, it gives discomfort to the person who receives hair dye. Furthermore, since the alkali color agent has strong irritation to the scalp, it has been difficult to apply it to people with weak scalp. In contrast, the slightly alkaline colorant is used to supplement the color of the already-dyed hair, and since the swelling action is small, the melanin component in the hair does not easily flow out from the gap between the open cuticles. The damage given is small, the irritating odor is weak and the scalp is less irritating, but there is a problem that it is difficult to dye gray hair alone because the dyeing effect is small.

For example, as shown in Patent Document 1, it is a hair dyeing method using an oxidative hair dye composition containing a dye, an alkali agent, and an oxidant, and the pH during use is 9 for new hair. .5 to 11.0 alkaline oxidative hair dye composition is applied, and a slightly alkaline oxidative hair dye composition having a pH of 7.5 to 9.4 in use is applied to already-dyed hair. Such hair dyeing methods are known. As a result, a slightly alkaline oxidative hair dye is used for pre-dyed hair to reduce the progress of decoloration, while a strong alkaline oxidative hair dye is used for new hair that has not yet been decolored. By making the degree of decolorization larger than in the case of already-dyed hair, the degree of progress of decolorization is uniform between the already-dyed hair part and the new hair part after hair dyeing, and the color of the hair during fading So that there is no difference in brightness. However, this also uses a strong alkaline oxidative hair dye composition for nascent hair, so damage to the hair cannot be suppressed, the irritating odor is strong, and the scalp is not stimulated. The problem of strength cannot be solved.
JP2002-241248

  In addition, 3% to 6% of an oxidizer is added to a low alkali color agent having a lower alkalinity and a lower alkali agent content than an alkali color agent, but having a higher alkali agent content than a slightly alkaline color agent. Although there is a method of dyeing using an oxidative hair dye composition, there is a problem that the dyeing is very dark as compared with the case of using an alkali color agent, and the dyeing effect is hardly obtained.

  The present invention is intended to solve the above-mentioned problems, and it is possible to sufficiently obtain the effect of dyeing hair such as gray hair, to suppress damage applied to the hair, and to weaken the irritating odor and cause less irritation to the scalp. An object is to provide a hair method.

In order to achieve the above object, the constitutional feature of the present invention is a hair dyeing method using an oxidative hair dye composition, which has a pH of 7 obtained by adding a low-concentration first oxidant to a slightly alkaline colorant. A first hair dyeing step of applying a weakly alkaline first oxidative hair dye composition in the range of 5 to 9.4 to the new hair on the base side of the hair and leaving it to stand for 10 to 15 minutes is performed. A second oxidative hair dye composition having a weak alkalinity is obtained by performing a scouring process of washing the hair with water after the scouring process, and adding a second oxidant having a lower concentration than the first oxidant to the slightly alkaline colorant after the scouring process. Is applied to new hair on the base side of the hair and left for 9 to 11 minutes to perform a second hair dyeing step.

  The slightly alkaline colorant means that the pH is in the range of 7.5 to 9.4, and is distinguished from the highly alkaline alkaline colorant in which the PH is in the range of 9.5 to 11.0. . The slightly alkaline colorant and the alkali colorant contain an alkali agent and a dye as a composition, and have different alkalinity. As the alkali agent, for example, alkanolamines such as monoethanolamine and diethanolamine, ammonia, sodium hydroxide, potassium hydroxide and the like are appropriately blended. Examples of the dye include oxidative dye intermediates which are one kind or a mixture of two or more kinds of phenylenediamines, aminophenols, diaminoviridines and salts thereof, resorcin, pyrogallol, m-aminophenol and the like. There are dyes consisting of couplers which are salts of these, and direct dyes such as tar dyes and natural dyes. Examples of the oxidizing agent include hydrogen peroxide and urea peroxide.

In the present invention configured as described above, in the first hair dyeing process in which the first oxidative hair dye composition having low alkalinity is applied to new hair on the base side of the hair and left for 10 to 15 minutes, The swelling action of hair due to hair is small and the damage to hair is small, but the hair is not dyed sufficiently. However, by washing the hair with water after the first hair dyeing step, the hair is slightly dyed and kept in a swollen state. Applying a weakly alkaline first oxidative hair dye composition to which a second oxidant having a lower concentration than the oxidizer is added to the new hair on the base side of the hair and leaving it for 9 to 11 minutes, the root side part of the hair The hair dyeing effect on the hair is enhanced, and hair dyeing substantially equivalent to the case where a conventional alkali colorant is used is performed. On the other hand, even in the second hair dyeing step, the effect of reducing the damage given to the hair is maintained by the slightly alkaline colorant because the melanin component in the hair hardly flows out from the gap of the cuticle that has a small swelling action. In addition, since the hair dyeing method of the present invention uses a weakly alkaline oxidative hair dye composition, the irritating odor is weak and the scalp is less irritating, which gives discomfort to many people who are dyed. Moreover, hair is safely dyed. Furthermore, in the present invention, the hair dyeing time can be shortened to about 2/3 compared with the conventional method.

Moreover, in this invention, after apply | coating the 2nd oxidation hair dye composition to the new hair on the root side of the hair in the 2nd hair dyeing process, the 2nd oxidation hair dye composition is further applied to the remaining hair end side. Can be applied. Thus, in the 2nd hair dyeing process, when fading on the hair end side is remarkable, after applying the 2nd oxidation hair dye composition to the root side, the 2nd oxidation hair dye on the hair tip side. By applying the composition, the hair end side can be matched with the root side dyeing while suppressing hair damage.

Moreover, in this invention, after apply | coating the 1st oxidation hair dye composition in the 1st hair dyeing process to the new hair on the root side of hair , the 2nd oxidation hair dye composition is further applied to the remaining hair end side. May also be applied. As described above, in the first hair dyeing process, when the fading of the hair is remarkable, after the application of the first oxidative hair dye composition, the second oxidative hair dye composition is further applied to the hair tip side. Thus, the degree of dyeing on the hair end side can be adjusted to the root side while suppressing damage to the hair.

According to the present invention, the slightly alkaline colorant contained in the weakly alkaline first oxidative hair dye composition has a small swelling action on the hair and little damage to the hair, but the hair is not fully dyed. Then, the hair is washed with water after the first hair dyeing step, and then the second oxidative hair dye composition is applied to the hair root side, so that the hair dyeing effect on the new hair on the hair root side is enhanced and alkalinized. The hair is dyed to the same extent as when a color agent is used. In addition, according to the present invention, since no strongly alkaline alkaline colorant is used as in the prior art, damage to the hair can be reduced, and since the irritating odor is weak, the discomfort given to the person receiving the hair is suppressed. It can be applied to people with weak scalp because it has little irritation to the scalp. In the present invention, when the fading on the hair end side is remarkable, after applying the second oxidation hair dye composition to the new hair on the base side of the hair in the second hair dyeing step, or after the first dyeing. After applying the first oxidative hair dye composition to the new hair on the hair root side in the hair process, the second oxidative hair dye composition is applied to the hair end side, thereby suppressing the hair damage. Side staining can be matched to the root side.

Hereinafter, an embodiment of the present invention will be described.
In the hair dyeing method using the oxidative hair dye composition according to the example, first, as the first hair dyeing process, low-concentration (approximately 3%) hydrogen peroxide as the first oxidant is added to the slightly alkaline colorant. The weakly alkaline first oxidative hair dye composition having a pH of 7.5 to 9.4 is applied to the new hair 1 on the base side of the head hair shown in FIG. Left unattended. Thereby, in the 1st hair dyeing | staining process, although the swelling action of the hair by a fine alkali color agent is small and the damage given to hair is small, hair dyeing is not fully performed.

  After the first hair dyeing step, the first oxidative hair dye composition is washed away by washing the hair with water as a sinking step. Thus, by washing the hair with water after the first hair dyeing step, the hair is slightly dyed and kept in a swollen state.

  Next, in the second hair dyeing step, a weakly alkaline first solution obtained by adding a low-concentration (approximately 2%) hydrogen peroxide solution, which is a second oxidizing agent having a concentration lower than that of the first oxidizing agent, to the fine alkali colorant. The second oxidative hair dye composition is applied to the new hair 1 on the base side of the hair, and the second oxidative hair dye composition is applied again and left for 9 to 11 minutes. Thereby, the hair dyeing effect of the new hair 1 is enhanced and desired hair dyeing is performed. On the other hand, even in the second hair dyeing process, the melanin component in the hair is less likely to flow out from the gap between the cuticles, which has a small swelling action due to the slightly alkaline colorant, compared to the case of using a conventional alkaline alkaline colorant having a strong alkalinity. The effect of reducing damage to the hair is maintained. In the second hair dyeing step, if the already-dyed hair 2 that is the tip of the hair is fading, the second hair dye composition is already applied after the application of the first hair dye composition. It can apply | coat to the dyed hair 2, Thereby, the dyeing | staining state of the new hair 1 and the already dyed hair 2 can be match | combined.

  As described above, according to the present embodiment, the hair swelling action by the slightly alkaline color agent is small and damage to the hair is small, but the hair is washed with water after the first hair dyeing process in which hair is not sufficiently dyed. Since the new hair 1 is slightly dyed and kept in a slightly swollen state, the second oxidative hair dye composition is then applied to the new hair 1 and the hair end side is further faded. Is large, by applying the second oxidation hair dye composition on the already-dyed hair 2 on the hair end side, the hair coloring effect on the whole hair is enhanced and desired hair coloring is performed. . Further, in this embodiment, since a conventional alkaline colorant having strong alkalinity is not used, an effect of reducing damage to hair can be obtained. Furthermore, according to this example, since the irritating odor is weak by using a weakly alkaline slightly alkaline color agent, it is possible to suppress discomfort given to the person who receives hair dyeing, and furthermore, there is less irritation to the scalp, so It can be applied with peace of mind to weak people.

  In addition, in the said 1st hair dyeing | staining process, when fading is intense about the already dyed hair 2 which is the hair end side, after application | coating of the said 1st hair dye composition, the said 2nd hair dye composition Can be applied to the already-dyed hair 2, whereby the dyed state of the new hair 1 and the already-dyed hair 2 can be matched. Also, the above values can be slightly changed for the concentrations of hydrogen peroxide as the first oxidant and the second oxidant.

In the present invention, a weak alkaline first oxidative hair dye composition obtained by adding a low-concentration oxidant to a slightly alkaline colorant is applied to new hair on the base side of the hair and allowed to stand for 10 to 15 minutes. The first oxidative hair dye composition is washed away by washing the hair with water, and a weak alkaline second oxidative hair dye composition obtained by adding a low-concentration second oxidant to the slightly alkaline colorant is applied to the base of the hair . Applying to new hair and leaving it for 9 to 11 minutes is useful because it is possible to perform proper hair dyeing without damaging the hair.

It is explanatory drawing which shows roughly the hair dyeing method which is an Example of this invention.

Explanation of symbols

1 ... new hair, 2 ... dyed hair.

Claims (3)

A hair dyeing method using an oxidation hair dye composition,
Apply a weakly alkaline first oxidative hair dye composition in which pH is in the range of 7.5 to 9.4, which is obtained by adding a low-concentration first oxidant to a slightly alkaline colorant, to new hair on the base side of the hair. 1st hair dyeing process to leave for 10-15 minutes,
After the first hair dyeing process, perform a washing process to wash the hair with water,
After the flowing step, a second alkaline hair dye composition having a weak alkalinity, which is obtained by adding a second oxidizing agent having a lower concentration than the first oxidizing agent to the slightly alkaline colorant, is applied to new hair on the base side of the hair. A hair dyeing method comprising performing a second hair dyeing step for 9 to 11 minutes. After applying the second oxidative hair dye composition to the new hair on the base side of the hair in the second hair dyeing step, further applying the second oxidative hair dye composition to the remaining hair end side. The hair dyeing method according to claim 1, wherein After applying the first oxidative hair dye composition to the new hair on the base side of the hair in the first hair dyeing step, further applying the second oxidative hair dye composition to the remaining hair end side. The hair dyeing method according to claim 1 or 2, characterized by the above.

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