Hair dye, hair dye paste and hair dyeing method

Abstract

To provide a hair dye and a hair dyeing method that produce a stable finished color immediately after hair dyeing and have good color retention without using titanium dioxide.SOLUTION: A hair dye of the present invention is characterized by containing a hair dye mainly composed of henna powder and indigo powder, a color development medium which is a lactic acid oligomer, and a color development assistant which is a Si component that improves the color development of the hair dye by the color development medium. Preferably, the color development medium is added in an amount of 2 to 8 pts.wt. to 100 pts.wt. of the hair dye. When the total amount of the color development medium and the color development assistant is 100 mass%, the proportion of the color development assistant is preferably 10 to 40 mass%.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a hair dye, a hair dye paste, and a hair dyeing method, and more particularly to a hair dye, a hair dye paste, and a hair dyeing method that contain henna and indigo as main ingredients. [Background technology]

[0002] In hair dye compositions, synthetic p-phenylenediamine and aminophenol oxidation dyes have been widely used as dye components because they have excellent dyeing power and can produce a wide variety of colors. However, it has been pointed out that these types of oxidation dyes are of concern for causing skin disorders, being environmental hormones that have a negative effect on the ecosystem, and being carcinogenic and allergy-inducing.

[0003] On the other hand, direct dyes such as HC dyes and basic dyes, which are considered to be safe, are also used. Hair dyes using direct dyes can be used in the neutral range, so there is no damage to hair caused by alkali, and since there is no need for oxidizing agents such as hydrogen peroxide, there is no risk of accidents caused by skin irritation or contact with the eyes, and they are considered to be relatively safer than hair dyes using oxidative dyes.

[0004] For example, HC dyes and basic dyes do not cause chemical reactions and do not damage hair even if they are repeatedly dyed. However, the dyeing effect is not very long-lasting and the color tends to fade with repeated shampooing.

[0005] Recently, henna has been attracting attention as a dye. Henna contains the active ingredient 2-hydroxy-1, 4-naphthoquinone and is an orange to brown natural dye obtained by drying and crushing the leaves of Lawsonia inermis, a shrub of the Lythraceae family that grows in tropical regions such as India and Iran.

[0006] For example, a cream-like hair dye composition has been proposed that contains 1 to 40% by weight of either or both of henna powder and henna extract, as well as water, oil, an activator, a treatment agent, an HC dye, and a basic dye (Patent Document 1).

[0007] Also, a hair dye has been proposed in which 20 to 90% by weight of henna powder and 80 to 20% by weight of dried Indian indigo leaf powder are mixed with water to form a paste (Patent Document 2). DISCLOSURE OF THEINVENTION

[0008] For hair dyes that use henna powder as the main ingredient, the dye paste is applied to the hair and then heated at around 30°C to 35°C for 10 to 30 minutes, or left for around an hour with a cap to prevent water evaporation, after which the hair is shampooed and dried with a hair dryer. However, it takes time for the color to develop stably, and it is not possible to confirm a stable finished color until several days have passed since dyeing.

[0009] In view of such problems, Patent Document 3 (Patent No. 5684686) proposes the following hair dye composition with the objective of providing a hair dye composition that enables a stable finish color to be developed immediately after dyeing hair with henna.

[0010] The hair dye composition proposed in this patent publication is a blend of 100 parts by weight of henna powder and 0.0075 to 0.015 parts by weight of titanium dioxide powder having calcium phosphate microparticles and silk microparticles adsorbed on its surface.

[0011] That is, one of the features of the hair dye composition proposed in the above patent publication is that titanium dioxide powder having calcium phosphate microparticles and silk microparticles adsorbed on its surface is blended with henna powder.

[0012] The role of this titanium dioxide powder is to give the hair superhydrophilicity through the photocatalytic reaction of titanium dioxide, allowing the polyphenols, the main components of henna, to quickly penetrate into the hair and bind to the hair tissue while also providing the finished color, resulting in a stable finished color being produced immediately after dyeing.

[0013] In the research of the present inventors, it was confirmed that titanium dioxide also exerts its function in coloring a dye obtained by adding indigo to henna. However, in recent years, titanium dioxide has been banned in the EU and other countries, as it is no longer considered safe to use as a chemical substance, and its use in food products is likely to be banned in the near future in hair dyes and cosmetics as well. [Prior art documents] [Patent documents]

[0014] [Patent Document 1] JP 2010-1278 A [Patent Document 2] JP 2003-300845 A [Patent Document 3] Patent No. 5684686 Summary of the Invention [Problem to be solved by the invention]

[0015] Therefore, an object of the present invention is to provide a hair dye and a hair dyeing method which can produce a stable finished color immediately after dyeing and have good color retention without using titanium dioxide. [Means for solving the problem]

[0016] In order to solve the above problems, the hair dye, hair dye paste, and hair dyeing method of the present invention have the following configurations (1) to (13). (1) A hair dye containing a hair dye mainly composed of henna powder and indigo powder, a coloring medium which is a lactic acid oligomer, and a coloring assistant which is a silicon component which improves the coloring property of the hair dye by the coloring medium. And, The color-developing medium is added in an amount of 2 to 8 parts by weight per 100 parts by weight of the hair dye; When the total amount of the color-developing medium and the color-developing assistant is 100% by mass, the ratio of the color-developing assistant is 10 to 40% by mass. A hair dye characterized by: (2) The hair dye according to (1), wherein the color-developing medium is added in an amount of 4 to 6 parts by weight per 100 parts by weight of the hair dye. (3) The color-developing medium and the color-developing assistant are combined to produce a color-developing medium having a color-developing assistant ratio of 23 to 34% by mass. 1 ) hair dye. (4) The hair dye according to (1), wherein the mass ratio of henna powder to indigo powder in the main components of the hair dye is 40-15:60-85. (5) The hair dye according to (1) above, which contains wild plant minerals extracted from seaweed, wild grasses, tree leaves, and other wild plant groups. (6) The hair dye according to (1) above, which contains a fragrance. (7) The fragrance is lavender powder or lavender extract. (6) Hair dye. (8) The above (1) to (7) A hair dye paste is formed by dissolving any one of the above hair dyes in hot water at about 30℃ to 45℃. (9) The above preservatives have been added (8) Hair dye paste. (10) The preservative is at least one of rosemary extract, Japanese pepper extract, honeysuckle extract, grapefruit extract, and Pulsatilla koreana extract. (9) Hair dye paste. (11) The above (8) A hair dyeing method in which a hair dye paste is applied to hair. (12) A hair dyeing method comprising applying the hair dye paste according to (9) to hair. (13) Effect of the Invention

[0017] In this hair dye, lactic acid oligomer is used as a color-developing catalyst instead of titanium dioxide, so it is harmless to the human body, and it can dye hair in light brown, brown, dark brown, soft black, etc. in one dyeing, and has the effect of providing good color fixation.

[0018] The hair dye according to an embodiment of the present invention contains a hair dye mainly composed of henna powder and indigo powder, a color developing medium which is a lactic acid oligomer, and a color developing assistant which is a Si component that improves the color development of the hair dye by the color developing medium.

[0019] The henna to be used should have a Lawsonia (Lawson) content of 1.0% or more, preferably 1.5% or more, and a sand content of 2.0% or less. It is particularly preferable to use AAA (Triple A) rank henna (Lawsonia (Lawson) content of 1.7% or more, sand content of 1.0% or less) certified by the Natural Henna Shirodhara Research Association. As the indigo powder, commercially available natural indigo powder can be used.

[0020] The mass ratio of henna powder to indigo powder in the main components of the hair dye is adjusted to the color of the finished dye, but is about 40-15:60-85. By the way, for light brown it is about 40:60, for brown it is 30:70, for dark brown it is 20:80, and for soft black it is about 15:80.

[0021] The lactic acid oligomer used as the color-developing medium includes linear polymerized lactic acid and cyclic polymerized lactic acid. In the present invention, it is preferable to use cyclic polymerized lactic acid, and it is preferable to use plant-derived cyclic polymerized lactic acid. Such cyclic polymerized lactic acid is commercially available or distributed in the market, and is therefore relatively easy to obtain.

[0022] The color-developing medium is preferably added in an amount of 2 to 8 parts by weight, particularly 4 to 6 parts by weight, per 100 parts by weight of the hair dye. If the amount is less than the above range, there will be problems such as a long time required for color development, but considering the effect of dyeing once, it is desirable for the color to develop within a certain time (e.g., 30 minutes), and from this point of view, it is better not to be less than the above range. Moreover, if the amount exceeds the above range, further improvement in the effects such as color development cannot be expected, and the cost performance will be significantly deteriorated, so it is better not to exceed the above range.

[0023] The Si component as a color development assistant may be either crystalline or non-crystalline, and may be silica (SiO). When the total amount of the color-developing medium and the color-developing assistant is taken as 100% by mass, the ratio of the color-developing assistant is preferably 10 to 40% by mass, particularly 23 to 34% by mass. Within this range, a good color-developing effect can be obtained, and the required amount of cyclic polymerized lactic acid as an expensive color-developing medium can be reduced, which is highly effective in terms of cost.

[0024] The hair dye according to the embodiment of the present invention preferably contains wild plant minerals extracted from wild plants such as seaweed, wild grasses, tree leaves, etc. As the wild plant minerals, it is preferable to use those sold by Kenso Co., Ltd. under the product name "BIE Wild Plant Mineral Magman."

[0025] The hair dye according to the embodiment of the present invention preferably contains a fragrance. Any fragrance can be used as the fragrance, but it is preferable to use a fragrance derived from a plant, for example, lavender powder or lavender extract. I can list some examples.

[0026] The hair dye paste according to the embodiment of the present invention can be prepared by dissolving it in hot water at about 30° C. to 45° C. The amount of hot water used at this time is preferably about 3 to 5 times the amount of the solid content of the hair dye.

[0027] It is desirable to add a preservative to such a hair dye paste to prevent spoilage. The amount of preservative added may be an appropriate amount. The preservative to be used is preferably one derived from a plant, and for example, at least one of rosemary extract, Japanese pepper extract, honeysuckle extract, grapefruit extract, and Pulsatilla koreana extract is preferable.

[0028] In the hair dyeing method using the hair dye paste according to the embodiment of the present invention, the hair dye paste as described above is applied to the hair, and after a predetermined time (e.g., 30 minutes) has elapsed, the hair is dyed (the hair dye is washed off), and then dried to complete the process.

[0029] Examples will be described below. Preparation of hair dye paste of the embodiment. First, as shown in Table 1, henna powder and indigo powder were prepared to prepare a dye sample, and then lactic acid oligomer as a coloring medium and silica (Si component) as a coloring aid were added to this as shown in Table 1 to prepare hair dye samples of Examples 1 to 10. The sample of Example 1 to which lactic acid oligomer as a coloring medium and silica (Si component) as a coloring aid were not added was used as the sample of Comparative Example 1. Hot water of about 40°C, about four times the amount of the hair dye solid content, was added to the above samples, and the samples were kneaded well to prepare hair dye paste samples.

[0030] In the experiment, the sample hair dye paste was applied evenly to a test specimen made of 100 strands of gray human hair bound together, and after observing the color development, the specimen was washed off and dried. The color development and corrosion resistance of the completed specimen were then judged. Color development was judged by comparing with samples of each color. Corrosion resistance was judged by rubbing the sample with alkaline hot spring water and seeing whether it was decolorized or not. The results are shown in Table 1.

[0031] [Table 1]

[0032] As can be seen from Table 1, the best mode is 5g of color medium and 2g of color development assistant per 100g of dye, and adding more color medium and color development assistant is not expected to improve the effect and will only increase the cost. In Example 10, about 10 specimens were tested, but some specimens had a greenish tinge immediately after drying and did not seem to have perfect color development, so they were rated as ○. This is thought to be due to individual differences in hair.

[0033] From the above, the effects of the present invention are clear.

Claims

1. A hair dye containing a hair dye mainly composed of henna powder and indigo powder, a coloring medium which is a lactic acid oligomer, and a coloring assistant which is a Si component which improves the coloring property of the hair dye by the coloring medium, The color-developing medium is added in an amount of 2 to 8 parts by weight per 100 parts by weight of the hair dye; When the total amount of the color-developing medium and the color-developing assistant is 100% by mass, the ratio of the color-developing assistant is 10 to 40% by mass. A hair dye characterized by:

2. 2. The hair dye of claim 1, wherein the color-developing medium is added in an amount of 4 to 6 parts by weight per 100 parts by weight of the hair dye.

3. 2. The hair dye according to claim 1, wherein the color-developing assistant is present in an amount of 23 to 34% by mass when the total amount of the color-developing medium and the color-developing assistant is taken as 100% by mass.

4. 2. The hair dye of claim 1, wherein the mass ratio of henna powder to indigo powder in the main components of the hair dye is 40-15:60-85.

5. 2. The hair dye of claim 1, which contains wild plant minerals extracted from seaweed, wild grasses, tree leaves and other wild plant groups.

6. 2. The hair dye of claim 1, which further comprises a fragrance.

7. 7. The hair dye according to claim 6, wherein the fragrance is lavender or lavender extract in powder form.

8. A hair dye paste formed by dissolving the hair dye according to any one of claims 1 to 7 in hot water at about 30°C to 45°C.

9. 9. The hair dye paste of claim 8, further comprising a preservative added thereto.

10. 10. The hair dye paste of claim 9, wherein said preservative is at least one of rosemary extract, Japanese pepper extract, honeysuckle extract, grapefruit extract, and Pulsatilla koreana extract.

11. A method for dyeing hair, comprising applying the hair dye paste of claim 8 to hair.

12. A hair dyeing method comprising applying the hair dye paste of claim 9 to hair.

13. A hair dyeing method comprising applying the hair dye paste of claim 10 to hair.

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