Cosmetics

Abstract

To provide a cosmetic product that has a unique texture, such as being slippery or slimy during use, and that absorbs well after use, suppressing stickiness. [Solution] The cosmetic composition comprises (A) niacinamide and (B) a water-soluble diol compound having two hydroxyl groups in its molecule and being liquid at 25°C and 1 atmosphere, in an amount of 50 to 80% by mass or more relative to the total cosmetic composition, and the cosmetic composition may also contain water, if water is included, the amount of water contained in the cosmetic composition is 45% by mass or less.

Description

【Technical Field】 【0001】 The present invention relates to cosmetics. 【Background Art】 【0002】 Generally, most cosmetics contain a large amount of water as their base. By containing a large amount of water, they can provide moisture, improve affinity, dissolve and contain water-soluble beauty components, and reduce costs. On the other hand, cosmetics using oil as a base are also known. Since they can prevent drying and provide a smooth touch, they are used for hair oils and skin oils for specific parts. Cosmetics using oil as a base can not only provide moisture by suppressing the evaporation of moisture from the skin and hair with the oil agent, but also have the slipperiness and stickiness peculiar to oils during use, which can create an expected feeling during use. However, there are problems such as poor affinity, inability to dissolve water-soluble beauty components, and inhibition of skin affinity of water-soluble cosmetics used later. 【0003】 In particular, in order to stably contain water-soluble beauty components in a formulation, it is known that not only a certain amount of water should be included as a base, but also the composition of the cosmetics needs to be devised so that decomposition, denaturation, precipitation, or sedimentation does not occur over time. For example, in order to stably contain beauty components such as tranexamic acid and niacinamide, which are water-soluble but prone to recrystallization, in cosmetics, not only a large amount of water should be included as a base, but also attention must be paid to the types and amounts of other components used in the cosmetics. 【0004】 Given this background, cosmetic compositions that can be used even under conditions where there is little water as a base have been investigated. Examples include an oil-in-water emulsion composition containing nicotinamide, linear fatty acid polyethylene glycol ester, and petrolatum, with water content of 70% by mass or less (Patent Document 1), a topical skin composition containing concentrated birch sap and specific cosmetic ingredients, and further containing no added water (Patent Document 2), and a sunscreen composition containing a UV protectant, a non-thickening oil-absorbing powder, an oil phase, a skin treatment agent, and at least 10% by weight of water (see Patent Document 3). 【0005】 On the other hand, cosmetics are required not only to enhance actual beauty effects, but also to reduce discomfort during use and increase expectations through a better feel and texture. One example of such cosmetic texture development is a texture that has the smoothness and slipperiness of an oil, which absorbs smoothly and does not feel sticky after use, but leaves a unique moisturizing feeling and a lingering texture. 【0006】 While the cosmetics disclosed in Patent Documents 1-3 demonstrated certain effectiveness in terms of component precipitation stability and non-stickiness, the expectation derived from the texture during use was not sufficiently considered. Therefore, there is a need for a cosmetic that possesses a unique texture, such as smoothness and slipperiness, that enhances the expectation during use, while also providing good absorption and non-stickiness in the finished product. [Prior art documents] [Patent Documents] 【0007】 [Patent Document 1] Japanese Patent Publication No. 2018-069937 [Patent Document 2] Patent No. 7422214 [Patent Document 3] Patent No. 4422479 [Overview of the project] [Problems that the invention aims to solve] 【0008】 This invention was made in view of the above problems, and its purpose is to provide a cosmetic product that has a unique texture such as slipperiness or stickiness when used, and that blends well after use and suppresses stickiness. [Means for solving the problem] 【0009】 Against this backdrop, the inventors investigated how to create a unique oil-like texture by using a water-soluble polyol or a combination of a water-soluble polyol and water as a base. It is believed that using water-soluble polyols as a base can achieve a unique texture and lingering feel that differs from that of water. Furthermore, because it is not an oil, it blends well with water, and by examining its components and ratios, it is expected that a cosmetic product can be created that has a smooth and slippery feel during use, while also being easily absorbed after use and not sticky. In addition, it is expected that it will be possible to dissolve water-soluble beauty ingredients. 【0010】 To achieve the above objectives, the inventors conducted further diligent research and discovered that by including 50-80% by mass of a water-soluble diol compound having two hydroxyl groups in its molecule and being liquid at 25°C and 1 atm relative to the total cosmetic composition, and by keeping the amount of water in the cosmetic composition to 45% by mass or less, they achieved a unique texture during use, good absorption and non-stickiness after use, and further found that the cosmetic composition contains niacinamide stably, thus completing the present invention. Furthermore, the inventors discovered that by further including one or more selected from D-pantothenyl alcohol, dimethylformamide, and urea, the good absorption and non-stickiness after use are enhanced, and the stability of the water-soluble beauty ingredients over time is also improved, thus completing the present invention. 【0011】 The present invention is as follows: [1] A cosmetic comprising niacinamide and a water-soluble diol compound having two hydroxyl groups in its molecule and being liquid at 25°C and 1 atm in an amount of 50 to 80% by mass relative to the total cosmetic composition, wherein the cosmetic composition may also contain water, and if it contains water, the amount of water contained in the cosmetic composition is 45% by mass or less. [2] The cosmetic composition according to [1] above, further comprising one or more amide compounds selected from D-pantothenyl alcohol, dimethylformamide, and urea. [Effects of the Invention] 【0012】 The present invention provides a cosmetic product that has a unique texture, such as slipperiness and stickiness during use, and that absorbs well after use, with reduced stickiness. [Modes for carrying out the invention] 【0013】 The cosmetic composition according to this embodiment will be described below, but the present invention is not limited to the following embodiments. The present invention is not limited to each of the configurations described below, and various modifications are possible within the scope of the claims, and embodiments and examples obtained by appropriately combining the technical means disclosed in different embodiments and examples are also included in the technical scope of the present invention. In addition, unless otherwise specified in this specification, "A~B" representing a numerical range means "A or more, B or less". In addition, unless otherwise specified in this specification, "A%" representing a ratio means "A by mass%". 【0014】 <Cosmetics> The cosmetic composition according to this embodiment comprises (A) niacinamide and (B) a water-soluble diol compound having two hydroxyl groups in its molecule and being liquid at 25°C and 1 atmosphere. 【0015】 <Niacinamide> Component (A) in the cosmetic composition according to this embodiment is niacinamide. Niacinamide, also called nicotinamide or nicotinic acid amide, is the amide form of niacin (vitamin B3), and is a water-soluble vitamin with a molecular weight of 122.12 and CAS registry number 98-92-0. Nicotinic acid amide is a commonly used cosmetic ingredient for moisturizing, anti-inflammatory, and whitening purposes, and can be obtained as a commercially available cosmetic raw material. 【0016】 There are no particular limitations on the amount of component (A) included in the cosmetic composition according to this embodiment, but it is preferably 2.0% by mass or more in the cosmetic composition. Since niacinamide is a beauty ingredient, its effect increases with higher amounts. The cosmetic composition according to this embodiment can contain a relatively large amount of niacinamide by including component (B), which will be described later. General oily cosmetics have a slippery or slimy feel when used, absorb well after use, and suppress stickiness, but they cannot sufficiently dissolve niacinamide. On the other hand, the cosmetic composition according to this embodiment can stably contain niacinamide even if it is 2.0% by mass or more. 【0017】 <A water-soluble diol compound containing two hydroxyl groups in its molecule, which is liquid at 25°C and 1 atm.> Component (B) in the cosmetic composition according to this embodiment is a water-soluble diol compound having two hydroxyl groups in its molecule and being liquid at 25°C and 1 atm. Various water-soluble diol compounds are used in cosmetics, but their water solubility and texture when used differ depending on their molecular structure. Furthermore, the solubility of water-soluble active ingredients also differs depending on the molecular structure and IOB value. 【0018】 The IOB value is an abbreviation for Inorganic / Organic Balance, and it represents the ratio of inorganic values ​​to organic values, serving as an indicator of the degree of polarity of an organic compound. Specifically, the IOB value is expressed as "IOB value = inorganic value / organic value". Here, for each of the "inorganic value" and "organic value", an "organic value" of 20 is set for one carbon atom in a molecule, and an "inorganic value" of 100 is set for one hydroxyl group. The IOB value of an organic compound can be calculated by summing the "inorganic value" and "organic value" of all atoms and functional groups in the organic compound (see, for example, Fujita, "The Domain of Chemistry," Vol. 11, No. 10, pp. 719-725, 1957). 【0019】 In the cosmetic composition according to this embodiment, component (B) has two hydroxyl groups in its molecule. Having two hydroxyl groups in its molecule not only provides high water solubility but also allows for a slippery or slimy feeling during use, and furthermore, does not leave a sticky feeling after use. In addition, in the cosmetic composition according to this embodiment, component (B) is liquid at 25°C and 1 atmosphere. Being liquid in the environment in which the cosmetic is normally used allows for a slippery or slimy feeling during use. Examples of such component (B) include ethylene glycol, 1,2-propylene glycol, dipropylene glycol, 1,3-butylene glycol, 1,3-propanediol, 1,2-pentanediol, 2-methyl-1,3-propanediol, diethylene glycol, and triethylene glycol, but dipropylene glycol and 1,3-butylene glycol are preferred. 【0020】 In the cosmetic according to this embodiment, the blending amount of component (B) is 50 to 80% by mass in the cosmetic. By setting the blending amount of component (B) in the cosmetic to 50% by mass or more, it is possible to feel sufficient slipperiness and stickiness when using the cosmetic. Also, by setting the blending amount of component (B) in the cosmetic to 80% by mass or less, component (A) can be sufficiently dissolved. Fur thermore, the blending amount of component (B) in the cosmetic according to this embodiment is preferably 55 to 70% by mass in the cosmetic. If the blending amount of component (B) is 55% by mass or more, component (A) can be contained in the cosmetic without causing further precipitation or the like. Also, if the blending amount of component (B) is 70% by mass or less, it is possible to make the cosmetic feel comfortable and not sticky after use. 【0021】 <Water> The cosmetic according to this embodiment may contain water. When the cosmetic contains water, the blending amount of water in the cosmetic is 45% by mass or less. By setting the water to 45% by mass or less, it is possible to feel sufficient slipperiness when using the cosmetic. 【0022】 The cosmetic according to this embodiment contains (A) niacinamide and (B) a water-soluble diol compound having two hydroxyl groups in the molecule and being liquid at 25°C and 1 atm at 50 to 80% by mass or more based on the whole cosmetic, and the cosmetic may contain water. When the cosmetic contains water, by setting the blending amount of water contained in the cosmetic to 45% by mass or less, it can have a unique texture such as slipperiness and stickiness that enhance the sense of expectation during use, while having a good feel and no stickiness in the finish. 【0023】 <One or more amide compounds selected from D-panthenyl alcohol, dimethylformamide, urea> The cosmetic composition according to this embodiment may optionally further contain (C) one or more amide compounds selected from D-pantothenyl alcohol, dimethylformamide, and urea. In the cosmetic composition according to this embodiment, component (C), which is one or more amide compounds selected from D-pantothenyl alcohol, dimethylformamide, and urea, is a water-soluble compound commonly used as a cosmetic ingredient or solvent in cosmetics. In the cosmetic composition according to this embodiment, by further including component (C) in addition to components (A) and (B), the precipitation of component (A) due to recrystallization can be further suppressed. The reason why a particular amide compound has such an effect is not clear, but component (A) in the cosmetic composition according to this embodiment has a carbonyl group and an amino group, and more specifically, the same amide group as component (C). It is presumed that component (C), which has a similar functional group, inhibits the interaction between components (A) and other molecules to form crystal nuclei, thereby suppressing precipitation due to crystallization. 【0024】 The amount of component (C) in the cosmetic composition according to this embodiment is preferably 0.2 to 1.0% by mass. If the amount of component (C) is 0.2% by mass or more, a sufficient effect of suppressing the modification and precipitation of the cosmetic composition can be obtained. If the amount of component (C) is 1.0% by mass or less, the cosmetic composition will not cause any unpleasant stickiness or other adverse effects on the feel during use. 【0025】 <Other ingredients> In addition to the components described above, the cosmetic composition according to this embodiment may contain other components as appropriate, within the limits that do not impair the objectives of the present invention, such as anionic surfactants, cationic surfactants, amphoteric surfactants, nonionic surfactants, oils, emollients, polymer compounds, thickeners, polysaccharides, powders (pigments, resins, pigments), preservatives, fragrances, humectants, physiologically active ingredients, mineral salts, solvents, antioxidants, chelating agents, pearlescent agents, neutralizing agents, pH adjusters, plant extracts, enzymes, vitamins, amino acids, etc. 【0026】 Furthermore, the cosmetic composition according to this embodiment may contain physiologically active ingredients as appropriate, as long as it does not impair the objectives of the present invention. Physiologically active substances are substances that, when applied to the skin, provide some kind of physiological activity to the skin, and include, for example, whitening agents, anti-inflammatory agents, anti-aging agents, UV protection agents, astringents, antioxidants, blood circulation promoters, antibacterial agents, disinfectants, cooling agents, warming agents, wound healing promoters, and irritants. Examples include pain relievers, analgesics, and cell activators. Furthermore, although niacinamide is water-soluble as described above, it tends to recrystallize and precipitate in cosmetics. However, the cosmetic composition according to this embodiment can suppress precipitation even when a relatively large amount of niacinamide is incorporated. Therefore, even for beauty ingredients with similar properties to niacinamide, the cosmetic composition according to this embodiment can be incorporated in sufficient quantities, allowing those beauty ingredients to exert their effects. 【0027】 The cosmetic composition according to this embodiment can be manufactured according to conventional methods. Examples of the cosmetic composition according to this embodiment include lotions, emulsions, creams, serums, gels, sheet masks, makeup, body lotions, body gels, body creams, facial soaps, facial foams, body washes, cleansing agents, makeup bases, shampoos, conditioners, treatments, hair packs, hair styling products, and hair oils. The dosage form can also be arbitrarily selected according to the purpose. Examples include liquid, cream, gel, emulsion, sheet, stick, and aerosol forms. The cosmetic composition according to this embodiment is not limited to general cosmetics, but also includes quasi-drugs, designated quasi-drugs, and topical pharmaceuticals. [Examples] 【0028】 Next, the present invention will be described in detail based on examples, but is not limited thereto. Prior to the examples, the test methods and evaluation methods used in each example will be described. 【0029】 (Evaluation test of slipperiness and stickiness during application) <Evaluation Method> Five expert panelists applied 1.0 mL of the cosmetic formulations of the examples and comparative examples of the present invention to half of their face and allowed it to settle for 5 minutes. Sensory evaluation was conducted regarding the slipperiness and stickiness of the texture during application, and whether the applied substance felt like a cosmetic oil or a water-based cosmetic. The evaluation was based on the following scoring system. The test results were classified as follows using the average score of the five panelists, calculated by adding the scores for the slipperiness and stickiness of the texture during application and the scores for whether the applied substance felt like a cosmetic oil or a water-based cosmetic. <Evaluation of slipperiness and stickiness during application> 3 points... I felt a strong slipperiness and sliminess. Two points... I felt it was a bit slippery and slimy. One point... I felt a slight slipperiness and sliminess. 0 points... I didn't feel any slipperiness or sliminess. <The content of the evaluation regarding whether it feels like a cosmetic oil or a water-based cosmetic> 5 points... I felt it was a cosmetic oil. 0 points... I felt it was a water-based cosmetic. <Evaluation criteria for slipperiness and stickiness during application> ◎: The average score of the 5 participants was 7.0 or higher. ○: The average score of the 5 participants was between 6.0 and 7.0 points. △: The average score of the 5 participants was between 5.0 and 6.0. ×: The average score of the 5 participants was less than 5.0. 【0030】 (Evaluation test of how well the product blends in after application) <Evaluation Method> Five expert panelists applied 1.0 mL of the cosmetic formulations of the examples and comparative examples of the present invention to half of their face and allowed it to absorb for 5 minutes. Sensory evaluation was conducted on the absorption of the cosmetic formulations on the skin from application to after absorption, and the results were evaluated using the following scoring system. The test results were classified as follows using the average score of the five panelists. <Contents of the evaluation regarding how well the product blends after application> 3 points... It was easy to get used to. 2 points... It was somewhat familiar. One point...it didn't quite suit me. 0 points... It didn't suit me well. <Evaluation criteria for how well the product adheres after application> ○: The average score of the 5 participants was 2.0 or higher. △: The average score of the 5 participants was between 1.5 and 2.0 points. ×: The average score of the 5 participants was less than 1.5 points. 【0031】 (Evaluation test for non-stickiness after application) <Evaluation Method> Five expert panelists applied 1.0 mL of the cosmetic formulations of the examples and comparative examples of the present invention to half of their face and allowed it to absorb for 5 minutes. A sensory evaluation was conducted on the stickiness of the skin after absorption, and the results were scored as follows. The test results were classified as follows using the average score of the five participants. <Contents of the evaluation regarding the lack of stickiness after application> 3 points... It wasn't sticky. Two points... It wasn't too sticky. One point...it was slightly sticky. 0 points... It was sticky. <Evaluation criteria for non-stickiness after application> ○: The average score of the 5 participants was 2.0 or higher. △: The average score of the 5 participants was between 1.5 and 2.0 points. ×: The average score of the 5 participants was less than 1.5 points. 【0032】 (Evaluation test for precipitation inhibition) <Evaluation Method> After preparing the cosmetic compositions for the examples and comparative examples, they were added to cylindrical glass containers with a diameter of 2 cm and stored in a 0°C incubator for 3 months. To evaluate precipitation, the stored cosmetic compositions were visually inspected for precipitates. Precipitation suppression was classified according to the following evaluation criteria. <Evaluation Criteria for Precipitation Inhibition> ○: No precipitates were detected by visual inspection. △: Only a very small amount of precipitate was detected visually. ×: Precipitates were detected visually. 【0033】 <Examples 1-27 and Comparative Examples 1-8> Skin cosmetic formulations for each of the examples 1-27 and comparative examples 1-8 shown in Tables 1-3 were prepared by conventional methods and evaluated using the respective test methods. The results are also shown in Tables 1-3. 【0034】 [Table 1] 【0035】 [Table 2] 【0036】 [Table 3] 【0037】 As is clear from Tables 1-3, the cosmetics in Examples 1-27 all exhibited excellent performance. On the other hand, Comparative Examples 1-8, which lacked one or more essential components, exhibited slipperiness and stickiness during application. The invention failed to achieve its objectives because it was inferior in one or more aspects, such as good adhesion after application, lack of stickiness after application, or inhibition of precipitation. 【0038】 The following are other formulation examples of the skin cosmetic composition of the present invention. These skin cosmetic compositions not only exhibit excellent aesthetics, but also, when examined for smoothness during application, slipperiness, good absorption after application, lack of stickiness after application, and inhibition of precipitation, they all showed excellent properties. 【0039】 Example 28 (Beauty Serum) (1) Niacinamide 3.0% (2) Dipropylene glycol 60.0% (3) Glycerin 5.0% (4) 1,3-Butylene glycol 0.5% (5) Cyclohexanedicarboxylic acid bisethoxydiglycol 0.5% (6) PEG-75 0.5% (7) PEG-60 Hydrogenated Castor Oil 0.1% (8) Polysorbate 20 0.1% (9) Citric acid 0.001% (10) Sodium citrate 0.001% (11) Panthenol 0.8% (12) Retinyl palmitate 0.01% (13) Corn oil 0.01% (14) Tocopherol 0.2% (15) Bakuchiol 0.1% (16) Sodium hyaluronate 0.005% (17) Hydrolyzed collagen 0.005% (18) Peppermint leaf extract 0.01% (19) Green tea leaf extract 0.01% (20) Sage extract 0.01% (21) Disodium edetate 0.01% (22) Ethanol 0.2% (23) Phenoxyethanol 0.05% (24) Methylparaben 0.05% (25) Purified water remainder 【0040】 (Manufacturing method) (2) was mixed with (25) and dissolved uniformly. Then (1) and (3) to (24) were mixed with (24) and dissolved uniformly to prepare the beauty serum. 【0041】 Example 29 (Hair oil serum) (1) Niacinamide 3.0% (2) Dipropylene glycol 20.0% (3) 1,3-Butylene glycol 20.0% (4) Propanediol 10.0% (5) PEG / PPG / Polybutylene Glycol 8 / 5 / 3 Glycerin 0.5% (6) Pentanediol 0.5% (7) Diglycerin 0.5% (8) Sorbitol 1.0% (9) Inositol 0.2% (10) Mineral oil 0.5% (11) Squalane 0.1% (12) Ethylhexyl Methoxycinnamate 0.05% (13) Dipotassium phosphate 0.01% (14) Sodium phosphate 0.01% (15) HEDTA-3Na 0.02% (16) Potassium hydroxide 0.002% (17) (Acrylates / C10-30 Alkyl Acrylate) Crosspolymer 0.005% (18) Xanthan gum 0.02% (19) PEG-60 Hydrogenated Castor Oil 0.4% (20) PEG-40 Hydrogenated Castor Oil 0.15% (21) PEG-20 Glyceryl Oleate 0.2% (22) Methylparaben 0.05% (23)Fragrance 0.05% (24) Purified water remainder 【0042】 (Manufacturing method) (1) to (3), (5) to (9), (13) to (18) and (22) were added to (24) and uniformly dissolved (Solution A). (10) to (12) and (19) to (21) were added to (4) and uniformly dissolved (Solution B). Solution B was added to Solution A and stirred until uniform to prepare a hair oil serum.

Claims

[Claim 1] (A) Niacinamide and (B) A water-soluble diol compound having two hydroxyl groups in its molecule and being liquid at 25°C and 1 atm, comprising 50 to 80% by mass or more of the total cosmetic composition, The cosmetic composition may contain water, and if it contains water, the amount of water contained in the cosmetic composition is 45% by mass or less. [Claim 2] The cosmetic composition according to claim 1, further comprising (C) one or more amide compounds selected from D-pantothenyl alcohol, dimethylformamide, and urea.