JP5991513B2 - Hair coloring method for gray hair - Google Patents

Description

  The present invention relates to a method for dyeing gray hair. More specifically, the present invention relates to a method for dyeing gray hair that improves the color durability of gray hair dyed with a dye and is less likely to cause uneven dyeing even after repeated hair dyeing.

  In recent years, oxidative hair dyes containing synthetic dyes such as p-phenylenediamine-based and aminophenol-based oxidative dyes have been widely used as permanent hair dyes. The oxidative hair dye is usually used by mixing an oxidative dye and an oxidant and applying them to the hair. When an oxidative hair dye is applied, the oxidative dye penetrates into the hair, where it is oxidatively polymerized by the oxidant to produce a bulky Indian dye and the Indian dye develops color. Indian dyes can express a variety of color tones, and are oxidatively polymerized inside the hair and become bulky. Therefore, they are difficult to escape from the hair and have excellent color retention after dyeing.

  However, oxidative dyes are known to cause skin damage. In addition, there are indications that it is an environmental hormone that adversely affects the ecosystem, and that there are suspicions such as carcinogenicity and allergenicity. For this reason, oxidative hair dyes are regulated in Europe and the like.

  On the other hand, as a dye component of a hair dye, a dye having higher safety than an oxidation dye, such as a basic dye, is known. The basic dye is dyed by ionic bonding with the anionic group of the keratin protein on the hair surface. Conventionally, basic dyes have been used, for example, as a hair manicure for color lasting about 2 to 3 weeks, as a color rinse or color treatment that continues to give color by being used several times a week, or as a henna polyphenol or indigo It was used as a small amount of complementary color when dyeing polyphenol as a base color. For example, Patent Document 1 below describes at least one selected from the group consisting of HC dyes, basic dyes, disperse dyes, and natural pigments as a hair dyeing hairdressing composition having both a hairdressing effect and a hair dyeing effect. Disclosed is a hair coloring composition comprising at least one α-hydroxy acid ester and / or at least one dialkyl carbonate and at least one cross-linked polymer together with a hair coloring pigment that is one dye or pigment.

  In addition, as an example, Patent Document 2 below describes a hair dye comprising a dyeable plant powder such as henna polyphenol or indigo polyphenol as a base color, and a trace amount of basic dye and HC dye as a complementary color for toning the base color. In the case of dyeing hair by applying a paste of the composition for hair to hair, a technique for improving color developability by dyeable plant powder by blending thermally conductive inorganic particles is disclosed.

  Moreover, the following patent document 3 is disclosing the 1st agent containing a green tea extract, the 2nd agent containing a metal salt, and the 3rd agent containing an alkali agent as the Example, The 1st agent is hair. Applying and leaving it to stand, washing with water, then applying a mixed solution of the second agent and the third agent, leaving to stand and then washing with water, the fact that the process is repeated a plurality of times, the second agent and the third agent It is disclosed that HC dyes and basic dyes can be blended, and that changes with time can be suppressed by the method.

Japanese Patent Laying-Open No. 2005-213212 JP 2010-132596 A JP 2010-248103 A

  For example, basic dyes are considered to be safer than oxidative dyes. However, since the basic dye has a large molecular weight, it does not easily penetrate into the deep part of the hair, and because it is dyed to keratin protein by ionic bonds with weak binding power, the color after coloring is poor, There was a drawback that discoloration easily occurred by repeating shampooing. Therefore, the use of hair manicure for the purpose of maintaining the color for about 2 to 3 weeks, the use of color rinses and color treatments that maintain the color by continuing to give colors by using it several times a week, In the use as a complementary color in the case where the polyphenol dye disclosed in Patent Document 2 or Patent Document 3 is used as a base color, it can be used practically. There has been no attempt to use it as a so-called permanent hair dye for the purpose of.

  An object of the present invention is to provide a method for dyeing gray hair, which can maintain a long-lasting color tone that is close to that of a permanent hair dye even when a poor-colored dye such as a basic dye is used as a base color. And

Dyeing method of gray hair of the present invention comprises a first step of a basic dye for all dye components in the hair including the white hair by applying a dye charge liquid containing 50 mass% or more and left for a predetermined period of time, the dye solution a second step of washing away the excess dye solution from the coated hair, after the second step, the aqueous solution of tea powder obtained by pulverizing tea leaves hair was applied, after left standing a predetermined time, the tea powder solution A third step of washing away . According to such a hair dyeing method, even by using color retention bad dyes such as salt groups dyes as a base color, can be maintained for a long period of time the color retention. The effect of the present invention is thought to be achieved by the following mechanism through repeated experiments. In the first step, when coated with a dye solution comprising a salt group dye to the hair, basic dyes are fixed to anionic groups keratin proteins by osmotic and ionic bonding to the hair. Then, after rinsing and washing away the dye solution in the second step, a tea powder aqueous solution is applied in the third step. The tea catechin in the tea powder applied in the third step comes into contact with oxygen in the air and oxidatively polymerizes to form a film. The oxidative polymer of tea catechin formed in the third step covers the basic dye attached to the hair surface, which is fixed to the keratin protein by ionic bonds, thereby suppressing the elimination of the basic dye. I think it will be done. Further, the aqueous solution of tea powder has low color developability. Therefore, the following effects are produced. That is, tea catechin, which is a polyphenol component contained in tea powder, has a dark color unlike henna polyphenols that exhibit yellow to green colors and indigo polyphenols that exhibit blue colors, which are used as other hair dyes. Absent. Therefore, even when tea catechins are dyed on gray hair, tea catechins exhibit a colorless or very light color. For example, when hair is dyed with a combination of a basic dye and henna polyphenol as disclosed in Patent Document 2, since the fastness of each dye is different, only the color of henna polyphenol changes to the hair due to changes over time. The remaining tends to be a color different from the color of newly born natural hair. In this case, if you do not re-dye, the difference between the newly born white hair color and the yellowish white hair color that remains only the color of the previously dyed henna polyphenol is noticeable. When dyeing tinged gray hair, it is difficult to dye the entire hair without uneven dyeing due to the difference in color from newly born white hair. On the other hand, in the present invention, since an aqueous solution of tea powder is used as a treatment agent after hair dyeing, the color of tea catechin does not affect the color of hair even if only the color of tea catechin remains on the hair due to changes over time. Because of its colorless or extremely light color, it is difficult to distinguish it from the color of newly born natural hair, and the difference in color becomes inconspicuous. Therefore, when the whole white hair is dyed repeatedly, it is possible to suppress color unevenness between previously dyed white hair and new white hair.

  The tea powder is preferably fresh tea powder or tea powder containing 10% by mass or more of epigallocatechin gallate. As tea powder, there are fresh tea powder and steamed tea powder, but fresh tea powder is more effective in immobilizing the dye than steamed tea powder. The present inventor examined this reason, and noticed that fresh tea with high freshness contained epigallocatechin gallate at a higher rate than steamed tea, and contained 10% by mass or more of epigallocatechin gallate. It was found that when such a tea powder was used, the effect of fixing the dye was higher.

  The concentration of the tea powder dissolved in the aqueous solution is preferably 5% by mass or more from the viewpoint of obtaining a high effect.

  Moreover, it is preferable that a dye liquid contains 50 mass% or more of basic dyes with respect to all the dye components used as a base color. In addition, at least one selected from the group consisting of acetylcysteine, cysteamine, and thioglycolic acid, and having a pH of 7.5 to 9, can penetrate the dye into a deeper part inside the hair, As a result, it is preferable from the viewpoint that the color tone can be improved.

  According to the present invention, for example, when a basic dye having a high safety is used as a base color, it is possible to maintain a long-lasting color. Further, when hair is dyed by such a hair dyeing method, uneven dyeing is small even if it is repeatedly dyed.

One embodiment of the hair coloring method of the present invention will be described in detail below.
The method for dyeing gray hair of the present invention comprises a first step of applying a dye solution to hair containing gray hair and leaving it for a predetermined time; a second step of washing away the excess dye solution from the hair coated with the dye solution; After the second step, a third step of applying an aqueous solution of tea powder to the hair and leaving it for a predetermined time is provided.

First, the first step will be described.
The first step is a step of applying a dye solution to hair including gray hair and leaving it for a predetermined time.

  The dye solution is a solution containing a dye that becomes a base color, and the dye includes, for example, a basic dye. The basic dye is a dye that has an amino group or a substituted amino group in the molecule and becomes a cation in an aqueous solution, and those conventionally known as basic dyes can be used without any particular limitation. Since the basic dye becomes a cation in an aqueous solution, it is dyed by ionic bonding with the minus part of the keratin protein on the hair surface. Specific examples thereof include, for example, Basic Blue 7 (Ci42595), Basic Blue 16 (CI12210), Basic Blue 22 (CI61512), Basic Blue 26 (CI44045), Basic Blue 99 (CI56059), Basic Blue 117, Basic Violet 10 (CI45170), Basic Violet 14 (CI42515), Basic Brown 16 (CI12250), Basic Brown 17 (CI12251), Basic Red 2 (CI50240), Basic Red 12 (CI48070), Basic Red 22 (CI11055), Basic Red 51, Basic Red 76 (CI12245), Basic Red 118 (CI12251: 1), Basic Orange 31, Basic Yellow 28 (CI48054), Basic Yellow 57 (CI12719), Basic Yellow 87, Basic Black 2 (C.I.11825) and the like. These may be used alone or in combination of two or more.

  The dye solution preferably contains a basic dye as the main dye component of the base color. The proportion of basic dyes in all dye components is preferably 50% by mass or more, more preferably 60% by mass or more, and particularly preferably 80% by mass or more. As described above, by using a basic dye as a main component of the dye component, it is possible to realize highly safe hair dyeing.

  Specific examples of dye components other than basic dyes include HC dyes, polyphenol dyes, and other dyes. From the viewpoint of safety, it is preferable that an oxidation dye is not contained as much as possible.

  HC dye is a dye having a prefix of the well-known “HC”. Since it is a dye having a small molecular diameter, it penetrates into the hair and is dyed by hydrogen bonding or intermolecular attraction, resulting in deeper color development. Give. Specific examples thereof include, for example, HC Blue No. 2, HC Blue No. 2 8, HC Orange No. 1, HC Orange No. 1 2, HC Red No. 1, HC Red No. 3, HC Red No. 7, HC Red No. 8, HC Red No. 10, HC Red No. 11, HC Red No. 13, HC Red No. 16, HC Violet No. 2, HC Yellow No. 2, HC Yellow No. 5, HC Yellow No. 6, HC Yellow No. 7, HC Yellow No. 9, HC Yellow No. 9 12, etc. are mentioned. These may be used alone or in combination of two or more.

  It is preferable that the dye solution has basicity, specifically, pH of 7.5 to 9, more preferably about 8 to 8.5, from the viewpoint that the dye can easily penetrate into the hair. In order to adjust to such a liquid property, the dye solution preferably contains an alkaline agent. Specific examples of such alkali agents include, for example, alkaline reducing agents such as acetylcysteine, cysteamine, thioglycolic acid, ammonia, various alkanolamines, ammonium salts, organic amines, inorganic alkalis, basic amino acids, and the like. And the like. Among these, in particular, when an alkaline reducing agent of acetylcysteine, cysteamine and thioglycolic acid or an alkaline reducing agent in combination of acetylcysteine, cysteamine and thioglycolic acid is used, the dye is likely to penetrate into the hair. Tend. These may be used alone or in combination of two or more. Although the content rate of the alkaline reducing agent in the dye solution is not particularly limited, it is preferably 0.01 to 1% by mass, and more preferably 0.1 to 0.5% by mass.

  The dye solution is, for example, a basic dye, a dye such as HC dye, an alkaline agent, etc., mixed in a predetermined ratio, and into a liquid medium such as a cream base that has been conventionally used as a medium for hair dye components. It is mixed to form a paste or an aqueous solution and applied to the hair. Examples of the cream base include fat and oil components such as cetanol, stearyl alcohol, octyldodecanol, oleyl alcohol, instearyl alcohol, mineral oil, decyl oleate, isostearyl myristate, isopropyl palmitate, and triglyceryl. A cream base obtained by appropriately blending an emulsifier such as oxyethylene lauryl ether, sorbitan laurate, ceteth-2, oleth-10, and cetres-20 can be used without particular limitation.

  Although the density | concentration of the dye component contained in a dye liquid is not specifically limited, For example, it is preferable that it is 0.5-10 mass%, Furthermore, it is 1-5 mass%.

  The hair coated with the dye solution is left for a predetermined time. The standing time is appropriately adjusted depending on the preference of the color imparted to the hair and the type of dye used, but from the viewpoint of the working process, it is usually preferably 5 to 60 minutes, more preferably 10 to 30 minutes. . Moreover, when leaving, it is preferable to irradiate far infrared rays uniformly to the hair coated with the dye solution. The irradiation time can be shortened by irradiating the hair with far infrared rays. The temperature of the hair surface at the time of far-infrared irradiation is preferably about 20 to 40 ° C., more preferably about 25 to 35 ° C., from the viewpoint of not damaging the hair and giving an excessive burden to the human body.

  The second step is a rinsing step of washing away excess dye solution from the hair coated with the dye solution. The method of rinsing is not particularly limited as long as excess dye solution adhering to the hair can be washed away, but preferably, the dye solution is washed away with water or warm water without using a shampoo agent. In addition, towel washing is usually performed after washing.

  The third step is a step of applying an aqueous solution of tea powder to the rinsed hair and leaving it for a predetermined time. The aqueous solution of tea powder is, for example, a pasty aqueous solution containing tea powder as a main component.

  The tea powder is a powder obtained by pulverizing tea leaves, and examples thereof include fresh tea powder, steamed tea powder, and matcha tea powder. Note that many tea leaves are often steamed or roasted in order to suppress fermentation, but in the present invention, no such processing is performed on fresh tea. A powder containing a high concentration of tea catechins such as epigallocatechin gallate derived from it is preferable from the viewpoint of maintaining color lasting for a longer period of time. More specifically, a tea powder containing epigallocatechin gallate is preferably 10% by mass or more, and more preferably 12% by mass or more.

  The aqueous solution of tea powder is prepared in the form of a paste, for example, by dissolving or dispersing tea powder in water. The content ratio of tea powder dissolved in the aqueous solution of tea powder is not particularly limited, but specifically, it is preferably 5% by mass or more, more preferably 10% by mass or more, and particularly preferably 15% by mass or more. In addition, in the aqueous solution of tea powder, bromine acid used as a hair color oxidizer may be blended as necessary, as long as the effect of the present invention is not impaired. Since there is a tendency to inhibit the oxidative polymerization reaction of tea catechins, it is preferable not to add a hair color oxidizer such as bromic acid as much as possible unless there is a specific purpose.

  By applying an aqueous solution of tea powder and allowing it to stand for a predetermined time, the dye that has penetrated or adhered to the hair in the first step is more strongly fixed. Although the mechanism of this action has not been fully investigated, it has been found from the results of many experiments by the inventors that a highly active tea catechin undergoes oxidative polymerization with oxygen in the air, for example, a base immobilized on an anionic group of keratin protein. It is believed that a film that covers the neutral dye is formed, and this film suppresses color fading over time. This is presumed to be due to the fact that the effect is increased by irradiating far-infrared rays while standing. That is, after applying an aqueous solution of tea powder, the color fading over time is further suppressed by irradiating the hair with far infrared rays.

  As far-infrared irradiation conditions, the hair surface temperature is 20 to 40 ° C., more preferably about 25 to 35 ° C., and it is 10 to 60 minutes, further 15 to 30 minutes. It is preferable from the viewpoint that it is excellent and does not damage the hair or give an excessive burden to the human body. In addition, the color fading is further suppressed by leaving it for a predetermined time after irradiation with far infrared rays.

  Then, an aqueous solution of tea powder is applied, and the hair that has been left standing for a predetermined period of time, preferably irradiated with far-infrared rays, is subjected to a finishing shampoo to wash away the aqueous solution of tea powder, thereby dyeing white hair. After washing, towel drying and ventilation drying are performed. In this way, the hair coloring treatment for hair including white hair is completed.

  The hair coloring method of the present invention achieves long-lasting color retention of, for example, 1 month or more, or even 2 months or more, even when a basic color such as a basic dye is used as a base color. it can. In addition, when the white hair dyeing is repeated, even if the basic dye is lost and only the components derived from tea catechins remain in gray hair, the components derived from tea catechins are light in color, so the newly born white hair The difference in color from the color becomes inconspicuous. Therefore, when repeatedly coloring gray hair, color unevenness between previously dyed white hair and newly born white hair can be suppressed.

  Hereinafter, the present invention will be described in more detail with reference to examples. It should be noted that the scope of the present invention is not limited in any way by this example.

Example 1
50 g of a dye mixture prepared by mixing 5% by mass of a dye mixture obtained by mixing 9: 1 of a basic dye as a dye component and an HC dye on a cream base material containing cetanol as a main component, acetylcysteine, cysteamine and thioglycol A dye solution was prepared by mixing 50 g of an alkaline agent containing 1% by mass of an alkaline reducing agent as a mixture with an acid.

  Next, the prepared dye solution was applied to a hair bundle composed of human hair having a total weight of 10 g bound at one end. The human hair constituting the hair bundle was mainly white hair. The hair bundle to which the dye solution was applied was left for 10 minutes, and then irradiated with far infrared rays for about 15 minutes. At this time, the temperature of the hair bundle was about 30 ° C. Then, after confirming that the white hair of the hair bundle was uniformly dyed brown, the dye solution adhering to the hair bundle was washed away with water. And the water was wiped off with a towel.

  Next, 25 g of tea powder (tea color treatment powder manufactured by ITCB Global Co., Ltd., Uji tea fresh tea powder containing 12 to 15% by mass of epigallocatechin gallate) is dissolved in 175 g of hot water to dissolve the tea powder. An aqueous solution was prepared. Then, the prepared tea powder aqueous solution was applied to the hair bundle. And after leaving the hair bundle to which the tea powder aqueous solution was applied for 10 minutes, far-infrared rays were irradiated for about 20 minutes. At this time, the temperature of the hair bundle was about 30 ° C. Further, it was left to stand for about 10 minutes.

  The hair bundle was washed with a commercially available shampoo. And the water was wiped off with a towel. In the above hair dyeing, only about half the length of the hair bundle was dyed, and the remaining half was not dyed. In this way, a hair bundle in which only half the length was dyed was obtained.

  Then, the shampoo was applied to the hair bundle that was dyed once a day, and the change with time was observed with reference to the color of the undyed hair. As a result, even after two months have passed, the brown dye remains in the hair-dyed part without color loss, and the color boundary between the hair-dyed part and the part that has not been dyed is clear. It remained. When a 70-year-old female monitor was treated in the same process, the boundary between the root gray hair portion that had been stretched two months ago and the hair dyed two months ago was clearly observed.

(Example 2)
Instead of using tea powder (tea color treatment powder manufactured by ITCB Global Co., Ltd.), a hair bundle was used in the same manner as in Example 1 except that steamed tea powder containing less than 10% by mass of epigallocatechin gallate was used. The hair was dyed and evaluated. As a result, even after two months have passed, the brown dye remains in the hair-dyed part without color loss, and the color boundary between the hair-dyed part and the part that has not been dyed is clear. It remained. However, compared with the case of Example 1, the color boundary was slightly unclear.

(Example 3)
After leaving the hair bundle to which the aqueous solution of tea powder was applied for 10 minutes, instead of irradiating far infrared rays for about 20 minutes, the hair bundle to which the aqueous solution of tea powder was applied was left to stand naturally for 30 minutes. The hair bundle was dyed. That is, after the tea powder aqueous solution prepared in the same manner as in Example 1 was applied to the hair bundle, the hair bundle to which the tea powder aqueous solution was applied was allowed to stand for 30 minutes and then allowed to stand for about 10 minutes.
The hair bundle was washed with a commercially available shampoo. And the water was wiped off with a towel. Except for the steps described above, the hair bundle was dyed and evaluated in the same manner as in Example 1. As a result, when about 2 months passed, the dyed portion was somewhat faded. However, the color boundary between the part that was dyed and the part that was not dyed was clearly separated to some extent. If this result is compared with the result of Example 1, it can be seen that the color retention effect is improved by irradiating far infrared rays.

(Comparative Example 1)
The hair bundle was dyed in the same manner as in Example 1 except that the treatment for applying the tea powder aqueous solution was not performed. That is, in the same manner as in Example 1, the dye solution was applied to the hair bundle, left for 10 minutes, and then irradiated with far infrared rays for about 15 minutes. And after confirming that the white hair of the hair bundle was uniformly dyed brown, the dye solution adhering to the hair bundle was washed away with water, and further washed with a commercially available shampoo agent. And the water was wiped off with a towel. In addition, in the said hair dyeing, only about half the length of the hair bundle was dyed, and the remaining half was not dyed. In this way, a hair bundle in which only half the length was dyed was obtained.

  Then, the shampoo was applied to the hair bundle that was dyed once a day, and the change with time was observed with reference to the color of the undyed hair. As a result, when about 3 weeks passed, the dyed part faded, and the color boundary between the dyed part and the non-dyed part could not be distinguished, and it was clearly unclear.

(Comparative Example 2)
The same dye solution and tea powder aqueous solution as prepared in Example 1 were mixed at a ratio of 1: 1. Then, the prepared mixed agent was applied to a hair bundle composed of human hair having a total weight of 10 g bound at one end. Note that most of the human hair constituting the hair bundle was mostly gray hair.

The hair bundle to which the mixture was applied was allowed to stand for 10 minutes and then irradiated with far infrared rays for about 20 minutes. Further, it was left to stand for about 10 minutes. The hair bundle was washed with a commercially available shampoo. And the water was wiped off with a towel. In this way, a hair bundle in which only half the length was dyed was obtained.
Then, shampooing was performed once a day on the dyed hair bundle, and the change in the color of the dyed portion was observed with reference to the color of the undyed portion. As a result, when about 3 weeks passed, the dyed part faded, and the color boundary between the dyed part and the non-dyed part was clearly blurred. From this result, it can be seen that when the dye solution and the tea powder aqueous solution were mixed and applied, the color retention could not be sufficiently maintained.

(Comparative Example 3)
The hair bundle was dyed and evaluated in the same manner as in Example 1 except that the treatment with applying the dye solution was not performed and the aqueous tea powder solution was applied to the hair and allowed to stand for 30 minutes. The white hair in the hair that had been dyed was substantially unchanged in color.

  When hair is dyed using the method for dyeing gray hair according to the present invention, for example, even if a poorly colored dye such as a basic dye is used as a base color, the color can be maintained for a long period of time. . Therefore, a dye having poor color can be used as a substitute for a so-called permanent hair dye that can maintain long-term color, not hair intended for short-term color.

Claims (5)

The basic dye for all dye components in the hair including the white hair by applying a dye charge liquid containing 50 mass% or more, the first step to stand for a predetermined time,
A second step of washing away the excess dye solution from the hair coated with the dye solution;
After the second step, the aqueous solution of tea powder obtained by pulverizing tea leaves hair was applied, after left standing a predetermined time, the gray hair, characterized in that it and a third step of washing away the tea powder aqueous dyeing Hair way. The tea powder, dyeing method according to claim 1, wherein the path Uda obtained by pulverizing tea leaves raw tea.   The hair dyeing method according to claim 1 or 2, wherein the tea powder is a tea powder containing 10 mass% or more of epigallocatechin gallate.   The hair dyeing method according to any one of claims 1 to 3, wherein the concentration of the tea powder dissolved in the aqueous solution of the tea powder is 5% by mass or more.   The hair dye according to any one of claims 1 to 4, wherein the dye solution contains at least one selected from the group consisting of acetylcysteine, cysteamine, and thioglycolic acid, and has a pH of 7.5 to 9. Method.