Skin pigmentation composition

Abstract

To provide a skin coloring composition that contains an acidic dye and can color the skin with its coloring effect lasting in a sufficient manner.SOLUTION: A skin coloring composition contains an acidic dye and at least one of caprylyl glycol and urea.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a skin coloring composition that is used, for example, by applying it to the skin to color the skin. [Background technology]

[0002] BACKGROUND ART Skin coloring compositions have been known for coloring a part of the skin, such as an arm or a leg, or a part of the face, such as the eyebrow area, to a desired color.

[0003] Known skin coloring compositions of this type include, for example, those containing an aqueous extract of gardenia (for example, Patent Document 1). However, the skin coloring composition described in Patent Document 1 does not necessarily have high skin coloring performance. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Special Publication No. 2018-527361 Summary of the Invention [Problem to be solved by the invention]

[0005] In response to this, skin coloring compositions containing acid dyes that effectively color the skin have been considered, but skin coloring compositions that simply contain acid dyes do not necessarily provide good color retention after application to the skin.

[0006] Therefore, there is a need for a skin coloring composition that contains an acid dye and has good color durability.

[0007] In view of the above-mentioned needs, an object of the present invention is to provide a skin coloring composition that contains an acid dye and has good coloring durability. [Means for solving the problem]

[0008] The skin coloring composition according to the present invention is characterized by comprising an acid dye and at least one of caprylyl glycol and urea.

[0009] The skin coloring composition according to the present invention preferably further contains at least one of cellulose fibers and a water-soluble cellulose derivative. [Effects of the Invention]

[0010] The composition of the present invention contains an acid dye and has good color durability. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a photograph showing the skin coloring performance of each skin coloring composition. [Figure 2] FIG. 2 is a photograph showing the skin coloring performance of each skin coloring composition. [Figure 3] FIG. 3 is a photograph showing the skin coloring performance of each skin coloring composition. [Figure 4] FIG. 4 is a photograph showing the skin coloring performance of each skin coloring composition. [Figure 5] FIG. 5 is a photograph showing the skin coloring performance of each skin coloring composition. [Figure 6] FIG. 6 is a photograph showing the skin coloring performance of each skin coloring composition. [Figure 7] FIG. 7 is a photograph showing the skin coloring performance of each skin coloring composition. DETAILED DESCRIPTION OF THE INVENTION

[0012] An embodiment of the skin coloring composition according to the present invention will be described.

[0013] The skin coloring composition of this embodiment contains an acid dye (A) and at least one of caprylyl glycol (B) and urea (C). Preferably, the skin coloring composition of this embodiment further contains at least one of cellulose fiber and a water-soluble cellulose derivative (hereinafter also referred to as component D). The skin coloring composition of this embodiment can provide good coloring durability to the skin.

[0014] The acid dye (A) is a chemically synthesized artificial compound (synthetic organic dye) containing a polar group (acidic group) such as a carboxyl group, a sulfo group, or a hydroxy group in the molecule. Examples of the acid dye (A) include at least one selected from the group consisting of Red No. 2, Red No. 3, Red No. 102, Red No. 104, Red No. 105, Red No. 201, Red No. 227, Red No. 230, Red No. 232, Red No. 401, Red No. 502, Red No. 503, Yellow No. 4, Yellow No. 5, Yellow No. 202, Yellow No. 203, Yellow No. 402, Yellow No. 406, Blue No. 1, Blue No. 2, Blue No. 202, Blue No. 203, Blue No. 205, Orange No. 205, Orange No. 207, Orange No. 402, Green No. 3, Green No. 204, Green No. 205, Green No. 401, Green No. 402, Brown No. 201, Purple No. 401, and Black No. 401.

[0015] The skin coloring composition of this embodiment preferably contains acid dyes in a total amount of 0.005% by mass or more, more preferably 0.01% by mass or more, and even more preferably 0.05% by mass or more. This allows the skin coloring composition of this embodiment to have better color retention after being applied to the skin. In the skin coloring composition of the present embodiment, the amount of acid dye blended may be, for example, 1.0% by mass or less, or 0.5% by mass or less.

[0016] Caprylyl glycol has a molecular structure in which a hydroxyl group is bonded to the terminal carbon and the carbon next to it of an 8-carbon saturated straight-chain hydrocarbon. Caprylyl glycol is also known as 1,2-octanediol.

[0017] The skin coloring composition of this embodiment preferably contains 0.1% by weight or more, more preferably 0.2% by weight or more, and even more preferably 0.5% by weight or more of caprylyl glycol (B), and preferably contains 5.0% by weight or less of caprylyl glycol (B). This allows the skin coloring composition of this embodiment to have better color retention after being applied to the skin.

[0018] Urea (C) may be in the form of a salt such as hydrochloride.

[0019] The skin coloring composition of this embodiment preferably contains 0.1% by mass or more of urea (C), more preferably 0.5% by mass or more, and even more preferably 1.0% by mass or more of urea (C). The skin coloring composition of this embodiment may contain 15.0% by mass or less, or 10.0% by mass or less of urea (C). This allows the skin coloring composition of this embodiment to have better color retention after being applied to the skin.

[0020] As long as component D contains cellulose, it may be dispersed in the form of fibers or dissolved in the skin coloring composition of this embodiment. Cellulose fibers in component (D) are dispersed in the skin coloring composition. Meanwhile, water-soluble cellulose derivatives in component (D) are dissolved in the skin coloring composition.

[0021] Among (D), cellulose fibers include fibrous materials formed from cellulose. Such fibrous materials are usually water-insoluble and can be dispersed in a solvent containing water. Cellulose fibers are formed from multiple fibrous materials, and in each fibrous material, multiple sugar chains are bundled and extend in the fiber length direction of the fibrous material. The thickness of each fibrous material is usually 0.001 μm (1 nm) or more and 10 μm or less. The thickness of each fibrous material may be less than 1 μm (less than 1000 nm), 500 nm or less, or 300 nm or less.

[0022] Among (D), cellulose fibers can be obtained, for example, from wood pulp. Cellulose fibers can be obtained, for example, by subjecting wood pulp to a fiberization treatment in water. Examples of fiberization methods include a high-pressure homogenizer method, a microfluidizer method, and a ball mill grinding method.

[0023] The cellulose molecules constituting the cellulose fibers may be modified. Specifically, functional groups may be introduced into parts of the cellulose (e.g., parts of the hydroxyl groups) to result in carboxymethylation, phosphate esterification, phosphite esterification, carboxylation, sulfonation, cationization, or the like.

[0024] As the cellulose fibers, commercially available products can be used. Examples of commercially available products containing cellulose fibers that can be used include "Leocrysta" (manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.), "Cellenpia Series" (manufactured by Nippon Paper Industries Co., Ltd.), "ELLEX Series" (manufactured by Daio Paper Corporation), "AUROVISCO Series" (manufactured by Oji Holdings Co., Ltd.), and "NANOFOREST" (manufactured by Chuetsu Pulp Co., Ltd.).

[0025] Among (D), the water-soluble cellulose derivatives are water-soluble cellulose compounds in which part of the cellulose molecule has been chemically modified (denatured). The water-soluble cellulose derivative is at least one selected from the group consisting of carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropyl methyl cellulose, methyl cellulose, hydroxyethyl methyl cellulose, and hydrophobized water-soluble cellulose derivatives (such as hydrophobized hydroxypropyl methyl cellulose) in which some of the -OH groups of these compounds are substituted with alkyl groups having from 12 to 22 carbon atoms. Commercially available products can be used as these water-soluble cellulose derivatives.

[0026] The water-soluble cellulose derivative is preferably at least one of hydroxyethyl cellulose and carboxymethyl cellulose (including salt forms). This allows the skin coloring composition of this embodiment to have better color retention after being applied to the skin.

[0027] The skin coloring composition of this embodiment preferably contains cellulose fibers and water-soluble cellulose derivatives in a total amount of 0.1% by mass or more, more preferably 0.5% by mass or more, and even more preferably 1.0% by mass or more, calculated on solids. The skin coloring composition of this embodiment may contain cellulose fibers and water-soluble cellulose derivatives in a total amount of 3.0% by mass or less, or even 2.5% by mass or less, calculated on solids. This allows the skin coloring composition of this embodiment to have better color retention after being applied to the skin.

[0028] In the skin coloring composition of this embodiment, the mass ratio of caprylyl glycol (B) to the total amount of acid dye (A) is preferably 0.25 or more, more preferably 0.50 or more, and may be 12.50 or less. This allows the skin coloring composition of this embodiment to have better color retention after being applied to the skin.

[0029] In the skin coloring composition of this embodiment, the mass ratio of urea (C) to the total amount of acid dye (A) is preferably 0.25 or more, more preferably 1.25 or more, and may be 10.0 or less. This allows the skin coloring composition of this embodiment to have better color retention after being applied to the skin.

[0030] In the skin coloring composition of this embodiment, the mass ratio of the total amount of component (D) in terms of solid matter to the total amount of acid dye (A) is preferably 0.2 or more, more preferably 1.0 or more, and may be 8.0 or less. This allows the skin coloring composition of this embodiment to have better color retention after being applied to the skin.

[0031] In the skin coloring composition of this embodiment, the mass ratio of urea (C) to caprylyl glycol (B) is preferably 3 or more. Alternatively, this mass ratio may be 10 or less. This allows the skin coloring composition of this embodiment to have better color retention after being applied to the skin.

[0032] In the skin coloring composition of this embodiment, the mass ratio of the total amount of component (D) in solids equivalent to caprylyl glycol (B) is preferably 1 or more. Furthermore, such mass ratio is preferably 5 or less. This allows the skin coloring composition of this embodiment to have better color retention after being applied to the skin.

[0033] In the skin coloring composition of this embodiment, the mass ratio of the total amount of component (D) in solids equivalent to urea (C) is preferably 0.1 or more, more preferably 0.2 or more, and preferably 1.0 or less, more preferably 0.8 or less. This allows the skin coloring composition of this embodiment to have better color retention after being applied to the skin.

[0034] The skin coloring composition may further comprise surfactants, antioxidants, thickeners, preservatives, and the like.

[0035] The properties and appearance of the skin coloring composition of this embodiment are not particularly limited. The skin coloring composition of this embodiment may be, for example, a liquid, semi-solid (e.g., gel, cream), or solid (e.g., powder, tablet, or sheet). The skin coloring composition of this embodiment may be contained in the contents of an aerosol product.

[0036] The skin coloring composition of this embodiment is used, for example, by being applied to the skin. The above-mentioned skin coloring composition is used by being applied, for example, to the skin of the face, the skin of the neck, the skin of the limbs, the skin of the trunk, the scalp, the skin of areas where body hair grows, etc. The skin coloring composition of this embodiment may also be incorporated into a skin patch for use. The above-mentioned skin coloring composition is not particularly restricted by the classification of cosmetics, quasi-drugs, pharmaceuticals, etc. under the Pharmaceutical and Medical Device Act, and is applicable to several fields.

[0037] The skin coloring composition of this embodiment is preferably used by applying it to the skin in the area where eyebrows grow. In other words, the skin coloring composition of this embodiment is preferably used for application to the skin in the eyebrow area. By applying the skin coloring composition of the present embodiment, which has been colored to a desired color, to the area of ​​the skin covered by the eyebrows, the area where the eyebrows grow can be made to appear to be the desired color, and therefore the composition can be used for eyebrow makeup. Furthermore, the skin coloring composition of the present embodiment is preferably applied to any part of the human body that has white spots or blemishes. By dyeing the skin part with white spots or blemishes, the skin of any part of the human body can be made to look beautiful, and therefore, the composition can be used to conceal skin defects.

[0038] The skin coloring composition of this embodiment is used, for example, as follows. First, traces of water and oil present on the surface of the skin to be treated are removed with a remover such as alcohol. The skin coloring composition is then applied to the skin, after which the composition is dried, such as by exposing the composition to heated air from a hair dryer or the like.

[0039] The skin coloring composition of the present invention is as exemplified above, but the present invention is not limited to the above-exemplified embodiments. In addition, in the present invention, various forms used in general skin external compositions, cosmetics, pharmaceuticals, etc. can be used within a range that does not impair the effects of the present invention.

[0040] The matters disclosed by this specification include the following. (1) A skin coloring composition comprising an acid dye and at least one of caprylyl glycol and urea. (2) The skin coloring composition according to (1) above, further comprising at least one of cellulose fibers and a water-soluble cellulose derivative. (3) The skin coloring composition according to (1) above, comprising the acid dye, caprylyl glycol, and urea. (4) The skin coloring composition according to (2) above, comprising the acid dye, caprylyl glycol, urea, and cellulose fibers. (5) The skin coloring composition according to (2) above, comprising the acid dye, caprylyl glycol, urea, and the water-soluble cellulose derivative. [Example]

[0041] The present invention will now be described in more detail with reference to examples, but the present invention is not limited to these examples.

[0042] Skin coloring compositions of Examples and Comparative Examples were produced as follows, and performance evaluations were carried out for each skin coloring composition.

[0043] <Details of ingredients in the skin coloring composition> (A) Acidic dye A mixture of Yellow No. 4, Red No. 227, Black No. 401, and Orange No. 205 (B) Caprylyl glycol (commercially available) (C) Urea (commercial product) (D) Cellulose (D-1) Cellulose fiber Product name: "Cellenpia CS-01C" (manufactured by Nippon Paper Industries Co., Ltd.) 100% solids Partially introduced functional groups: -CH2OH, -CH2OCOO (-) Na (+) Fiber diameter: Approximately 1 nm to 500 nm (D-2) Cellulose fiber Product name: "Aurovisco CS" (Oji Holdings Co., Ltd.) 100% solids Partially introduced functional group: -PO3H4 Fiber diameter: about 3 nm (D-3) Cellulose fiber Product name: "Leocrysta" (manufactured by Daiichi Kogyo Co., Ltd.) 100% solids Partially introduced functional group: -COO (-) Na (+) Fiber diameter: Approximately 1 nm to 10 nm (D-4) Water-soluble cellulose derivative: Hydroxyethyl cellulose Commercially available product, 100% solids (D-5) Water-soluble cellulose derivatives: Carboxymethylcellulose salt (Na salt) Commercially available product, 100% solids

[0044] Example 3、 6) / (Comparative Examples 1 and 2) / (Reference examples 1, 2, 4, 5) Each composition was produced according to the blending ratio shown in Table 1. Specifically, each composition was produced by mixing the blending components and stirring them in a homodisper at 1,000 rpm for about 2 minutes.

[0045] [Table 1]

[0046] <Evaluation of color durability> Each composition was applied to the skin of the arm in three separate applications, then allowed to dry. The next day, the degree of color remaining was visually evaluated using the following five-point scale. 1: The color has almost completely faded 2: A slight color remains, but the skin color is visible through 3: The color remains, but the skin color is slightly visible 4: The color remains deep and the skin color is barely visible 5: The color remains very dark and the skin color does not show through at all. The evaluation results are shown in Table 1 and Figure 1 (photograph). In Figure 1, the photograph on the left shows the state immediately after application of the composition, and the photograph on the right shows the state of coloration the next day. The same applies to the following figures.

[0047] As shown in Table 1 and Figure 1, good color durability was achieved by combining an acid dye with at least one of caprylyl glycol and urea. Furthermore, even better color durability was achieved by combining an acid dye with caprylyl glycol and urea. Furthermore, even better color durability was achieved by combining cellulose fiber or a water-soluble cellulose derivative.

[0048] Example 13 ~30) / (Comparative Examples 3 to 8) / (Reference examples 7~12) Each composition was produced using the formulation shown in Tables 2 to 7 in the same manner as described above. The color durability of each composition was evaluated in the same manner as described above. The results are shown in each table. The color durability evaluation test for each composition in Table 2 is shown in Figure 2. Similarly, the color durability evaluation test for each composition in Tables 3 to 7 is shown in Figures 3 to 7, respectively.

[0049] [Table 2]

[0050] [Table 3]

[0051] [Table 4]

[0052] [Table 5]

[0053] [Table 6]

[0054] [Table 7]

[0055] As described above, the skin coloring compositions of the examples contained an acid dye and at least one of caprylyl glycol and urea, and therefore had good color retention after application to the skin. The addition of cellulose fiber further improved color retention.

[0056] The reason why the skin coloring compositions of the examples were able to exhibit good color durability is believed to be as follows. As a hair coloring composition commonly used for dyeing hair, one containing an acid dye, similar to the skin coloring composition in the above example, is known. Hair coloring compositions are applied to hair, which is composed of dead cells excreted from the hair root. Therefore, once a coloring component such as an acid dye penetrates into the hair, it cannot be removed from the hair by turnover, as occurs in the stratum corneum of the skin. Therefore, if the coloring component can penetrate to a predetermined depth inside the hair, it is believed that the durability of the hair color will be improved. On the other hand, the outermost layer of the skin, the stratum corneum, is peeled off due to turnover. If the stratum corneum is not healthy, turnover will be accelerated, accelerating peeling of the stratum corneum, and coloring components that have penetrated the stratum corneum will be more likely to be expelled from the stratum corneum. Therefore, in order to maintain skin coloring for a long period of time, it is considered important not only to penetrate coloring components deeper into the stratum corneum, but also to maintain the stratum corneum in a healthy state and suppress the rate of turnover. For these reasons, it is believed that incorporating urea, which can normalize the stratum corneum, into a hair coloring composition will provide good color durability. Furthermore, caprylyl glycol is both lipophilic and hydrophilic, and is therefore thought to have good affinity with the skin. Therefore, it is believed that caprylyl glycol can promote the penetration of acid dyes into the skin. [Industrial Applicability]

[0057] The skin coloring composition of the present invention is applied to the skin for body painting, for example, to color the arms, legs, or torso in colorful colors, or for creating temporary tattoos. The skin coloring composition of the present invention is also applied to the skin to color the skin in the area covered by the eyebrows to a desired color, for example, to make the eyebrows appear to have a desired color, or to conceal skin defects such as vitiligo or age spots.

Claims

1. 0.05% by mass or more and 1.0% by mass or less of an acid dye; 0.2% by mass or more and 5.0% by mass or less of caprylyl glycol; A skin coloring composition comprising 0.1% by mass or more and 15.0% by mass or less of urea.

2. The skin coloring composition of claim 1 , further comprising at least one of cellulose fibers and a water-soluble cellulose derivative.

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