translucent skin cosmetic

Abstract

To provide translucent skin cosmetics that offer a translucent aesthetic appearance and prevent finger resistance from occurring during skin application, achieving a pleasant use feeling, as well as, excellent effectiveness.SOLUTION: Translucent skin cosmetics contain the following (A)-(F): (A) water; (B) divalent alcohol; (C) fatty acid sorbitan; (D) polyoxyethylene hydrogenated castor oil with a POE chain polymerization level of 60-100; (E) one or more selected from tranexamic acid, niacinamide, and ε-aminocaproic acid; and (F) one or more selected from carboxyvinyl polymer and alkyl-modified carboxyvinyl polymer.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a skin cosmetic having a translucent appearance.

Background Art

[0002] Cloudy low-viscosity cosmetics are highly demanded by consumers because of their high-class appearance and the impression of providing moisture and excellent smoothness. For example, Patent Document 1 proposes a non-greasy, cloudy liquid cosmetic that contains (a) polyoxyethylene hydrogenated castor oil with an HLB of 7 to 16, (b) sorbitan fatty acid ester with an HLB of 2 to 7, (c) an oil content other than isostearic acid of 0.2% by mass or less, (d) an ionic compound, has an L value of 20 or less, is excellent in the effect of imparting moisture and smoothness to the skin, and has very excellent stability over time. Further, Patent Documents 2 to 4 also propose cosmetics containing sorbitan fatty acid ester and polyoxyethylene hydrogenated castor oil.

[0003] The cosmetics described in Patent Documents 1 to 4 form niosomes (vesicles of a bilayer membrane composed of nonionic surfactants) with polyoxyethylene hydrogenated castor oil and sorbitan fatty acid ester, and have a cloudy appearance due to the scattering of light by the niosomes. Cosmetics containing niosomes have a cloudy and high-class appearance, but have a problem of strong finger-stopping when applied to the skin and inferior usability. Note that finger-stopping means a state in which the finger that was being moved to acclimatize to the skin stops without slipping.

[0004] Also, tranexamic acid, niacinamide, and ε-aminocaproic acid are known as active ingredients formulated in cosmetics. These are active ingredients that exhibit effects such as whitening effect, anti-inflammatory effect, and prevention effect of rough skin, but it is known that the usability decreases when formulated in cosmetics. [[ID=2,6]]

Prior Art Documents

Patent Documents

[0005] [Patent Document 1] Japanese Patent Publication No. 2021-20858 [Patent Document 2] Japanese Patent Publication No. 2021-113155 [Patent Document 3] Japanese Patent Publication No. 2021-113156 [Patent Document 4] Japanese Patent Publication No. 2022-110471 [Overview of the project] [Problems that the invention aims to solve]

[0006] The present invention aims to provide a translucent skin cosmetic that has a translucent and aesthetic appearance, is easy to apply to the skin without getting stuck on the fingers, has a superior feel, and is highly effective. [Means for solving the problem]

[0007] The main components of this invention are as follows: 1. A translucent skin cosmetic containing the following (A) to (F). (A) Water (B) Divalent alcohols (C) Sorbitan Fatty Acid (D) Polyoxyethylene hydrogenated castor oil with a degree of polymerization of POE chains of 60-100 (E) One or more of the following: tranexamic acid, niacinamide, or ε-aminocaproic acid (F) One or more carboxyvinyl polymers and alkyl-modified carboxyvinyl polymers 2. The proportion of (E) in the total cosmetic product is A translucent skin cosmetic according to 1., satisfying one or more of the following: 0.1-5% by mass of tranexamic acid, 1-10% by mass of niacinamide, and 0.01-1% by mass of ε-aminocaproic acid. [Effects of the Invention]

[0008] The translucent skin cosmetic of the present invention has a translucent, opaque, and luxurious appearance, and also exhibits excellent stability of its appearance. Despite containing active ingredients that would otherwise have a poor feel, the translucent skin cosmetic of the present invention has an excellent feel when applied to the skin without getting stuck to the fingers, thus excelling in both feel and efficacy. [Modes for carrying out the invention]

[0009] The translucent skin cosmetic composition of the present invention (hereinafter also referred to as the cosmetic composition of the present invention) contains the following (A) to (F). (A) Water (B) Divalent alcohols (C) Sorbitan Fatty Acid (D) Polyoxyethylene hydrogenated castor oil with a degree of polymerization of POE chains of 60-100 (E) One or more of the following: tranexamic acid, niacinamide, or ε-aminocaproic acid (F) One or more carboxyvinyl polymers and alkyl-modified carboxyvinyl polymers In this invention, "translucent" means a material whose transmittance is 0.1 to 90 when the transmittance of transparent purified water in the visible light region (660 nm) with an optical path length of 1 cm is set to 100. In this specification, the notation "A~B (where A and B are numerical values)" means a numerical range that includes both ends, i.e., A or greater and B or less.

[0010] (A) Water The cosmetic composition of the present invention contains water as an essential component. The water content can be set according to transparency, viscosity, etc., but for example, it can be 50% by mass or more and 99% by mass or less relative to the total cosmetic composition of the present invention. The water content is preferably 70% by mass or more, more preferably 80% by mass or more, even more preferably 85% by mass or more, and preferably 98% by mass or less, more preferably 97% by mass or less, and even more preferably 96% by mass or less.

[0011] (B) Divalent alcohols Dihydric alcohols contribute to the stability of the cosmetics of the present invention. As the dihydric alcohol, any dihydric alcohol that can be formulated in cosmetics can be used without particular limitation as long as it exhibits the effects of the present invention. Examples thereof include ethylene glycol, 1,3-butylene glycol (BG), propylene glycol, dipropylene glycol (DPG), pentylene glycol, polyethylene glycol, butylethylpropanediol, etc., and one or more of these can be mixed and used. Among these, BG, DPG, and pentylene glycol are preferred. The blending ratio of the dihydric alcohol is not particularly limited as long as it is within the range that exhibits the effects of the present invention, and can be 1% by mass or more and 20% by mass or less based on the total amount of the cosmetics of the present invention. The blending ratio of the dihydric alcohol is preferably 1.5% by mass or more, more preferably 2% by mass or more, and preferably 17% by mass or less, more preferably 14% by mass or less, and even more preferably 10% by mass or less.

[0012] (C) Sorbitan fatty acid Sorbitan fatty acid, also called sorbitan fatty acid ester, is an ester of sorbitan and fatty acid, and is used alone or in combination with other surfactants as a food emulsifier and a cosmetic / industrial surfactant. Examples of sorbitan fatty acid include sorbitan sesquisoisostearate, sorbitan sesquioleate, and sorbitan oleate, and preferably one or more of sorbitan sesquisoisostearate and sorbitan sesquioleate can be mixed and used. Among these, sorbitan sesquisoisostearate is preferred. The blending ratio of sorbitan fatty acid is preferably 0.01% by mass or more and 5% by mass or less based on the total amount of the cosmetics of the present invention, more preferably 0.05% by mass or more, even more preferably 0.1% by mass or more, and more preferably 3% by mass or less, even more preferably 2% by mass or less.

[0013] (D) Polyoxyethylene hydrogenated castor oil with a degree of polymerization of the POE chain of 60 to 100 Polyoxyethylene hydrogenated castor oil has an average degree of polymerization of the polyoxyethylene chain of 60 to 100. Examples of polyoxyethylene hydrogenated castor oil include PEG-60 hydrogenated castor oil, PEG-80 hydrogenated castor oil, and PEG-100 hydrogenated castor oil, and one or more of these can be mixed and used. The degree of polymerization of polyoxyethylene hydrogenated castor oil is preferably 80 to 100, more preferably 100, from the viewpoints of the dispersion stability and storage stability of niosomes.

[0014] The blending ratio of polyoxyethylene hydrogenated castor oil is preferably 0.01% by mass or more and 5% by mass or less, more preferably 0.05% by mass or more, further preferably 0.1% by mass or more, and more preferably 3% by mass or less, further preferably 2% by mass or less, based on the total amount of the cosmetics of the present invention. In the cosmetics of the present invention, the mass ratio (C:D) of (C) sorbitan fatty acid ester and (D) polyoxyethylene hydrogenated castor oil having a degree of polymerization of the POE chain of 60 to 100 is preferably 10:90 to 90:10, more preferably 20:80 to 80:20, further preferably 30:70 to 70:30, from the viewpoint of niosome formation. In the cosmetics of the present invention, from the viewpoint of the stability of niosomes, the ratio of component (B) to the total of components (C) and (D) (B / (C + D)) is preferably 1 or more and 20 or less, more preferably 1.5 or more, and more preferably 15 or less.

[0015] (E) One or more of tranexamic acid, niacinamide, and ε-aminocaproic acid Tranexamic acid is an abbreviation for trans-4-aminomethylcyclohexane-1-carboxylic acid and is mainly used in cosmetics as a whitening agent and anti-inflammatory agent. Examples of commercially available products include "Japanese Pharmacopoeia Tranexamic Acid" (Maruzen Pharmaceutical Co., Ltd.). Tranexamic acid can be tranexamic acid or its derivatives, and derivatives can be tranexamic acid salts (metal salts such as magnesium salts, calcium salts, sodium salts, potassium salts, phosphates, hydrochlorides, hydrobromides, sulfates, etc.), tranexamic acid esters (vitamin esters such as vitamin A esters, vitamin E esters, vitamin C esters, alkyl esters), tranexamic acid amides, and tranexamic acid dimers. The blending ratio of tranexamic acid is preferably 0.1% by mass or more and 5% by mass or less, more preferably 0.3% by mass or more, even more preferably 0.5% by mass or more, even more preferably 4% by mass or less, and even more preferably 3% by mass or less, relative to the total amount of the cosmetic composition of the present invention.

[0016] Niacinamide is a water-soluble vitamin that is an amide compound of nicotinic acid, also known as nicotinamide, vitamin B3, or niacin. Niacinamide is known to have wrinkle-reducing, blood circulation-promoting, skin-soothing, melanin-inhibiting, and skin-whitening effects. Niacinamide may be an extract from natural products (such as rice bran) or synthesized by known methods; specifically, those listed in the 18th edition of the Japanese Pharmacopoeia 2021 can be used. The amount of niacinamide added to the cosmetic composition of the present invention is preferably 1% by mass or more and 10% by mass or less, more preferably 1.5% by mass or more, even more preferably 2% by mass or more, even more preferably 8% by mass or less, and even more preferably 6% by mass or less.

[0017] ε-aminocaproic acid is known to have anti-inflammatory and skin-soothing effects. The amount of ε-aminocaproic acid blended is preferably 0.01% by mass or more and 1% by mass or less, more preferably 0.05% by mass or more, even more preferably 0.1% by mass or more, even more preferably 0.8% by mass or less, and even more preferably 0.6% by mass or less, relative to the total amount of the cosmetic composition of the present invention.

[0018] In the cosmetic composition of the present invention, when (E) is tranexamic acid, from the viewpoint of the feel of use, the amount of tranexamic acid blended per 1 part by mass of (D) is preferably 1 part by mass or more and 20 parts by mass or less, more preferably 1.5 parts by mass or more, and more preferably 15 parts by mass or less. In the cosmetic composition of the present invention, when (E) is niacinamide, from the viewpoint of the feel of use, the amount of niacinamide blended per 1 part by mass of (D) is preferably 1 part by mass or more and 20 parts by mass or less, more preferably 1.5 parts by mass or more, and more preferably 15 parts by mass or less. In the cosmetic composition of the present invention, when (E) is ε-aminocaproic acid, from the viewpoint of its feel, the amount of ε-aminocaproic acid blended per 1 part by mass of (D) is preferably 0.1 parts by mass or more and 1 part by mass or less, more preferably 0.15 parts by mass or more, and more preferably 0.8 parts by mass or less.

[0019] (F) One or more carboxyvinyl polymers and alkyl-modified carboxyvinyl polymers Component (F) is a water-soluble thickener. Carboxyvinyl polymers can also be commercially available, such as CARBOPOL941 from BF Goodrich or Hibiscus Wako 105 (registered trademark) from Wako Pure Chemical Industries. Alkyl-modified carboxyvinyl polymers can be commercially available, such as CARBOPOL1342, CARBOPOL ETD2020, PEMULEN TR-1, and PEMULEN TR-2 (registered trademarks) from BF Goodrich.

[0020] The blending ratio of carboxyvinyl polymer is preferably 0.01% by mass or more and 1% by mass or less, more preferably 0.05% by mass or more, and more preferably 0.5% by mass or less, relative to the total cosmetic composition of the present invention. The blending ratio of the alkyl-modified carboxyvinyl polymer is preferably 0.01% by mass or more and 0.5% by mass or less, more preferably 0.05% by mass or more, and more preferably 0.3% by mass or less, relative to the total cosmetic composition of the present invention.

[0021] The cosmetic composition of the present invention contains the above-mentioned components (A) to (F). Although the detailed mechanism is unknown, the cosmetic composition of the present invention, by containing all of the above-mentioned components (A) to (F), has a translucent and aesthetically pleasing appearance, does not cause sticking to the fingers, has a superior feel, and can achieve both a good feel and effectiveness.

[0022] In addition to components (A) to (F), the cosmetic composition of the present invention may contain other components commonly used in cosmetics, depending on the desired use and effect. Examples of such other components include water-soluble organic solvents such as non-divalent alcohols, chelating agents, whitening agents, emollients, moisturizers, antioxidants, colorants, preservatives, fragrances (including essential oils), various oily components, and various aqueous components, and can be blended in a range that does not impair the effects of the present invention.

[0023] The cosmetic composition of the present invention is aqueous and can be a toner, aqueous lotion, aqueous cosmetic, etc. As described above, the cosmetic composition of the present invention is semi-transparent and has a transmittance of 0.1 to 90 when the transmittance of transparent purified water in the visible light region (660 nm) with an optical path length of 1 cm is set to 100. The transmittance can be adjusted according to the type of product, the effect to be promoted, etc.

[0024] "Preparation of cosmetics" The cosmetic composition of the present invention is prepared by heating components (B) to (D) to 85°C and mixing them, adding this to a portion of the heated water component (A), then adding an aqueous solution of (F), cooling to room temperature, and finally adding an aqueous solution of (E). The heating temperature is preferably 80 to 100°C, more preferably 80 to 90°C, and even more preferably 85 to 90°C. When prepared in this manner, niosomes mainly consisting of (C) sorbitan fatty acid and (D) polyoxyethylene hydrogenated castor oil are formed in the cosmetic composition. The formed niosomes have a particle size of about 200 nm, are stably dispersed in the cosmetic composition, and scatter light, resulting in a translucent cosmetic composition. [Examples]

[0025] The present invention will be specifically described below with reference to test examples and embodiments. Cosmetics were prepared to match the formulations shown in Tables 1-4 and evaluated using the following method. The results are shown in Tables 1-4. Note that cosmetics that received a "×" rating for stability (separation) were not evaluated for usability. "Evaluation Method" • Appearance (cloudy white) Using a UV-Vis spectrophotometer, the transmittance of light with a wavelength of 660 nm was measured with an optical path length of 1 cm, and the transmittance of purified water was set to 100%. ○: Transmittance of 0.1% or more and 90% or less. ×: Transmittance is less than 0.1% or greater than 90%. ·Stability The samples were placed in glass bottles approximately 4 cm in diameter and 60 ml in capacity, stored at 50°C for one month, and then visually inspected according to the following criteria. (separation) ○: Does not separate. ×: Separation of oil was confirmed. (Decrease in turbidity) ○: After storage at 25°C for one month, the increase in transmittance is 3% or less, and the transmittance is 90% or less. ×: After storage at 25°C for 1 month, the increase in transmittance exceeds 3%, and / or the transmittance is higher than 90%. ·Feeling of use Based on the consensus of three expert panelists, a sensory evaluation was conducted on the feeling of how each cosmetic product adhered to the fingers when one drop (approximately 0.3 mL) was placed on the back of the hand and rubbed in, using the scoring method described below. The following scores were assigned. ○: No finger rests. ×: There is a finger rest.

[0026] [Table 1]

[0027] [Table 2]

[0028] [Table 3]

[0029] [Table 4]

[0030] ·result The cosmetic compositions obtained in Examples 1 to 17 of the present invention had a cloudy appearance, excellent stability, and a smooth, non-sticky feel. The cosmetics obtained in Comparative Examples 1-5, which did not contain any of (B)-(F), were inferior in appearance, stability (separation), or feel. Comparative Example 2, which did not contain (C) sorbitan fatty acid, was transparent as no niosomes were formed. Comparative Examples 1 and 3, which did not contain (B) divalent alcohol or (D) polyoxyethylene hydrogenated castor oil with a degree of polymerization of 60-100 in the POE chain, were cloudy immediately after preparation due to the niosomes that were formed, but the niosomes were unstable and broke down and separated over time. Comparative Example 4, which did not contain tranexamic acid (component E), and Comparative Example 5, which did not contain carboxyvinyl polymer (component F), had excellent appearance and stability, but they were sticky and had poor usability. From these results, it was confirmed that the inclusion of both components (E) and (F) is necessary to prevent sticking.

[0031] Examples 1-3 and Comparative Example 6 confirmed that dihydric alcohols contribute to stability (separation), while glycerin, a trihydric alcohol, does not contribute to stability (separation). Examples 1, 4, 5 and Comparative Example 7 confirmed that finger sticking can be prevented by incorporating a carboxyvinyl polymer (carbomer) or an alkyl-modified carboxyvinyl polymer ((acrylates / alkyl(C10-30)) crosspolymer), and that this cannot be prevented by xanthan gum. Examples 1, 6-12 confirmed that the effects of the present invention can be achieved even when the amount and type of (C) sorbitan fatty acid and (D) polyoxyethylene hydrogenated castor oil with a degree of polymerization of POE chains of 60-100 are changed. Examples 1, 13-17 confirmed that the effects of the present invention are achieved by component (E), which consists of tranexamic acid, niacinamide, and ε-aminocaproic acid.

[0032] <Prescription Example 1> Lotion (by mass) water residue Tranexamic acid 2 DPG 5 Sorbitan sesquiisostearate 0.5 PEG-100 Hydrogenated Castor Oil 0.5 Betaine 1 Glycerin 5 Diglycerin 0.5 Glucose 0.1 Glycereth-26 1 Methylgluceth-10 1 Pentylene glycol 2 Ethylhexylglycerin 0.1 EDTA-2Na 0.05 Carboxyvinyl polymer 0.1 K hydroxide 0.015

Claims

1. It contains the following (A) to (F): A translucent skin cosmetic having a transmittance of 0.1 to 90, where the transmittance of clear purified water in the visible light region (660 nm) with an optical path length of 1 cm is set to 100. (A) Water (B) Divalent alcohols (C) One or more selected from sorbitan sesquiisostearate, sorbitan sesquioleate, and sorbitan oleate (D) Polyoxyethylene hydrogenated castor oil with a degree of polymerization of POE chains of 60 to 100 (E) One or more of the following: tranexamic acid, niacinamide, and ε-aminocaproic acid. (F) One or more carboxyvinyl polymers and alkyl-modified carboxyvinyl polymers

2. The proportion of (E) in the total cosmetic product is A translucent skin cosmetic according to claim 1, satisfying one or more of the following: 0.1 to 5% by mass of tranexamic acid, 1 to 10% by mass of niacinamide, and 0.01 to 1% by mass of ε-aminocaproic acid.

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