Skin cosmetics

Abstract

To provide a skin cosmetic which has a transparent appearance, is well compatible during application, does not give a squeaky feeling to the skin after the application, and gives a soft film feeling to the skin after the application.SOLUTION: A skin cosmetic comprising the following components (A), (B), (C), (D), (E), and (F): (A) a polyglycerol fatty acid ester, (B) 0.1 to 10% by mass of ethanol, (C) 1 to 20% by mass of a trihydric or higher hydric alcohol, (D) 0.01 to 0.3% by mass of an oil agent that is liquid at 25 °C., (E) one or more water-soluble polymers selected from acrylic acid-based polymers and water-soluble polysaccharides, and (F) water.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a skin cosmetic. [Background technology]

[0002] Conventionally, polyglycerol fatty acid esters and the like have been used as solubilizers to obtain cosmetic compositions that have a transparent or translucent appearance and an excellent feeling upon use, such as moisturizing effects. For example, Patent Document 1 describes that a cosmetic containing less than 10% of glycerin polymers with a degree of polymerization of 3 or less and a solubilizer consisting of polyglycerin with an average degree of polymerization of 10 to 20 and polyglycerin fatty acid esterified with a fatty acid having 8 to 22 carbon atoms has a transparent appearance, excellent temperature stability over time, and excellent feel when used. Patent Document 2 describes that a solubilized composition containing polyglyceryl ricinoleate obtained by esterifying 1.0 mol of polyglycerol having an average degree of polymerization of 10 to 20, 0.9 to 1.0 mol of ricinoleic acid to an acid value of 1.0 or less, and a polyglycerol fatty acid ester obtained by esterifying to an acid value of 1.0 or less is transparent and has excellent temperature stability and fat solubility. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-70529 [Patent Document 2] Japanese Patent Publication No. 2022-162888 Summary of the Invention [Problem to be solved by the invention]

[0004] Conventional cosmetics that use polyglycerol fatty acid esters as solubilizers have a transparent appearance, but have issues such as difficulty blending into the skin during application and a squeaky feeling on the skin after application. [Means for solving the problem]

[0005] The present inventors have discovered that by using a polyglycerol fatty acid ester in combination with ethanol, a trihydric or higher alcohol, a liquid oil, and a specific water-soluble polymer, it is possible to obtain a skin cosmetic that is transparent in appearance, blends well during application, does not leave a squeaky feeling on the skin after application, and leaves a soft film-like feeling on the skin after application.

[0006] The present invention relates to a composition comprising the following components (A), (B), (C), (D), (E), and (F): (A) polyglycerol fatty acid ester, (B) 0.1 to 10% by mass of ethanol, (C) 1 to 20 mass% of a trihydric or higher alcohol, (D) 0.01 to 0.3 mass% of an oil agent that is liquid at 25°C, (E) one or more water-soluble polymers selected from acrylic acid-based polymers and water-soluble polysaccharides; (F)Water The present invention relates to a skin cosmetic containing the compound. [Effects of the Invention]

[0007] The skin cosmetic of the present invention has a transparent appearance, is easily absorbed during application, does not leave a squeaky feeling on the skin after application, and leaves a soft film-like feeling on the skin after application. DETAILED DESCRIPTION OF THE INVENTION

[0008] In the polyglycerol fatty acid ester of component (A) used in the present invention, the average degree of polymerization of glycerol is preferably 2 or more, more preferably 4 or more, and even more preferably 6 or more, from the viewpoint of improving the transparency of the appearance and the long-term storage stability, and is preferably 20 or less, more preferably 15 or less, and even more preferably 12 or less. The constituent fatty acids of the polyglycerol fatty acid ester may be saturated or unsaturated, and are preferably saturated from the viewpoint of improving the transparency of the appearance. The number of carbon atoms is preferably 12 or more, and preferably 22 or less, more preferably 20 or less, and even more preferably 18 or less.

[0009] Examples of polyglycerol fatty acid esters include decaglycerol fatty acid esters such as polyglyceryl-10 laurate, polyglyceryl-10 myristate, polyglyceryl-10 stearate, polyglyceryl-10 distearate, polyglyceryl-10 tristearate, polyglyceryl-10 pentastearate, polyglyceryl-10 oleate, polyglyceryl-10 dioleate, polyglyceryl-10 isostearate, polyglyceryl-10 diisostearate, polyglyceryl-10 myristate, and polyglyceryl-10 laurate; octaglycerol fatty acid esters such as deca(behenic acid / capric acid)polyglyceryl-8; hexaglycerol fatty acid esters such as polyglyceryl-6 stearate; tetraglycerol fatty acid esters such as polyglyceryl-4 stearate; and diglycerol fatty acid esters such as polyglyceryl-2 stearate. Of these, from the viewpoint of improving the transparency of the appearance, it is preferable to include one or more selected from hexaglycerin fatty acid esters, octaglycerin fatty acid esters, and decaglycerin fatty acid esters, more preferably to include one or more selected from decaglycerin fatty acid esters, even more preferably to include one or more selected from polyglyceryl-10 laurate, polyglyceryl-10 myristate, polyglyceryl-10 diisostearate, polyglyceryl-10 isostearate, polyglyceryl-10 oleate, and polyglyceryl-10 dioleate, and even more preferably to include one or more selected from polyglyceryl-10 laurate, polyglyceryl-10 myristate, and polyglyceryl-10 oleate.

[0010] One or more types of component (A) can be used, and from the viewpoints of improving the transparency of the appearance, improving compatibility during application, reducing the squeaky feeling on the skin after application, and improving the feeling that the skin is covered with a soft film after application, the content is preferably 0.01 to 1 mass % of the total composition, more preferably 0.05 to 0.5 mass %, even more preferably 0.1 to 0.3 mass %, and even more preferably 0.13 to 0.24 mass %.

[0011] In the present invention, the content of ethanol in component (B) is 0.1 to 10% by mass, preferably 1 to 9% by mass, and more preferably 2 to 7% by mass, of the total composition from the viewpoints of improving compatibility during application, reducing the squeaky feeling on the skin after application, and improving the feeling that the skin is covered with a soft film after application.

[0012] The trivalent or higher alcohol of component (C) is a compound having three or more hydroxyl groups in the molecule, and may be any of those commonly used in cosmetics. Examples of trihydric alcohols include glycerin and trimethylolpropane. Examples of tetrahydric alcohols include diglycerin and erythritol. Examples of polyhydric alcohols having a valence of five or more include polyglycerins such as triglycerin; sugars and sugar alcohols such as glucose, maltose, maltose, sucrose, xylitol, sorbitol, malbitol, polyoxyethylene methyl glucoside, polyoxyethylene ethyl glucoside, and polyoxyethylene propylene glucoside.

[0013] From the viewpoints of improving compatibility during application, reducing the squeaky feeling on the skin after application, and improving the feeling that the skin is covered with a soft film after application, component (C) preferably contains one or more selected from trihydric alcohols, tetrahydric alcohols, and sugar alcohols, more preferably contains one or more selected from trihydric alcohols and tetrahydric alcohols, even more preferably contains one or more selected from glycerin and diglycerin, and even more preferably contains glycerin.

[0014] Component (C) can be used alone or in combination of two or more types, and the content is 1 to 20 mass% of the total composition, preferably 1.3 to 18 mass%, more preferably 2 to 12 mass%, and even more preferably 3.7 to 10 mass%, from the viewpoints of improving compatibility during application, reducing the squeaky feeling on the skin after application, and improving the feeling that the skin is covered with a soft film after application.

[0015] Component (D) is an oil that is liquid at 25° C. Liquid at 25° C. means that it has fluidity, and includes paste-like properties. The oil agent of component (D) is one that is commonly used in cosmetics, such as fragrances, fat-soluble vitamins, vegetable oils, and synthetic ester oils.

[0016] Examples of fragrances include natural plant fragrances such as peppermint oil, jasmine oil, camphor oil, cypress oil, spruce oil, lychee oil, turpentine oil, cinnamon bark oil, bergamot oil, mandarin oil, calamus oil, pine oil, lavender oil, cedarwood oil, bay oil, clove oil, hiba oil, rose oil, eucalyptus oil, orange oil, lemon oil, thyme oil, peppermint oil, rose oil, and sage oil; animal fragrances such as musk, leopard print, sea lily, and marigold; and fragrances obtained by processing these natural fragrance components; and single fragrance components such as l-menthol, l-menthyl glyceryl ether, cineole, eugenol, citral, citronellal, borneol, linalool, geraniol, camphor, thymol, spilanthol, pinene, limonene, and terpene compounds. It also includes compound fragrances, which are blends of plant-derived fragrances, animal-derived fragrances, and synthetic fragrances according to the purpose. Note that the term fragrance does not include vegetable oils or synthetic ester oils, which will be described later.

[0017] Examples of fat-soluble vitamins include vitamin A such as retinol, retinol acetate, retinol palmitate, and β-carotene; vitamin B such as pyridoxine hydrochloride (vitamin B6), nicotinic acid derivatives (nicotinamide, nicotinic acid benzyl ester), γ-oryzanol, riboflavin (vitamin B2) and vitamin B derivatives such as riboflavin acetate, pyridoxine dicaprylate, and pyridoxine dipalmitate; vitamin C such as ascorbic acid (vitamin C), monostearyl ascorbate, and ascorbic acid phosphate; vitamin D such as ergocalciferol (vitamin D2); vitamin E such as dl-tocopherol (vitamin E), tocopherol acetate, and tocopherol nicotinate; pantothenic acids such as calcium pantothenate, ethyl pantothenate, and D-pantothenyl alcohol (D-panthenol); and vitamin H such as biotin.

[0018] Examples of vegetable oils include soybean oil, rice bran oil, jojoba oil, avocado oil, almond oil, olive oil, cocoa butter, sesame oil, persic oil, castor oil, coconut oil, and mixtures thereof. Note that vegetable oils do not include the aforementioned flavorings. Examples of synthetic ester oils include monoester oils obtained from fatty acids having 8 to 18 carbon atoms and alcohols having 3 to 18 carbon atoms, and triester oils obtained from fatty acids having 8 to 10 carbon atoms and glycerin. Specifically, monoester oils obtained from fatty acids having 8 to 18 carbon atoms and alcohols having 3 to 18 carbon atoms include isononyl isononanoate, isostearyl isostearate, cetyl 2-ethylhexanoate, isopropyl myristate, myristyl myristate, isocetyl myristate, octyldodecyl myristate, isopropyl palmitate, and isostearyl palmitate. Triester oils obtained from fatty acids having 8 to 10 carbon atoms and glycerin include caprylic / capric triglyceride and triethylhexanoin. Component (D) preferably contains one or more selected from fragrances and vegetable oils, more preferably contains fragrances, and even more preferably contains natural vegetable fragrances.

[0019] Component (D) can be used alone or in combination of two or more types, and the content thereof is 0.01 to 0.3 mass % of the total composition, preferably 0.03 to 0.2 mass %, and more preferably 0.07 to 0.13 mass %, from the viewpoint of improving the transparency of the appearance. When component (D) is a fragrance, the content is 0.01 to 0.3 mass %, preferably 0.03 to 0.2 mass %, and more preferably 0.07 to 0.13 mass %, of the total composition, from the viewpoint of improving the transparency of the appearance.

[0020] In the present invention, the mass ratio (A) / (D) of component (A) to component (D) is preferably 0.05 to 50, more preferably 0.08 to 20, even more preferably 0.1 to 10, even more preferably 0.85 to 4, particularly preferably 0.95 to 3.5, preferably 1 to 3, and more preferably 1.2 to 2.6, from the viewpoints of improving the transparency of the appearance, improving compatibility during application, reducing the squeaky feeling on the skin after application, and improving the feeling that the skin is covered with a soft film after application.

[0021] In the present invention, the mass ratio (C) / (D) of component (C) to component (D) is preferably 5 to 800, more preferably 7 to 400, even more preferably 10 to 200, still more preferably 12 to 180, particularly preferably 27 to 135, and especially preferably 50 to 100, from the viewpoints of improving the transparency of the appearance, improving compatibility during application, reducing the squeaky feeling on the skin after application, and improving the feeling that the skin is covered with a soft film after application.

[0022] The water-soluble polymer of component (E) is one or more selected from acrylic acid polymers and water-soluble polysaccharides. Water-soluble means that it dissolves in pure water at 25°C at a rate of at least 0.1% by mass. Acrylic acid-based polymers include those used in ordinary cosmetics and include polymers containing acrylic acid or methacrylic acid as structural units, such as polyacrylic acid, polymethacrylic acid, carboxyvinyl polymer, methacrylic acid copolymer, and acrylic acid / C10-30 alkyl acrylate crosspolymer.

[0023] Examples of acrylic acid-based polymers that can be used include commercially available products such as (acrylates / C10-30 alkyl acrylate) crosspolymer (product name: PEMULEN TR-1 POLYMER (Lubrizol Advanced Materials)), carboxyvinyl polymer (product name: Carbopol 980 POLYMER (Lubrizol Advanced Materials)), and methacrylic acid copolymer (product name: Eudragit L100 (Evonic)).

[0024] The water-soluble polysaccharide is not limited as long as it is one that is commonly used in cosmetics, and may be one derived from a natural product or one obtained by chemical synthesis.

[0025] In addition, polysaccharide derivatives obtained by bonding, to part of the sugar of a polysaccharide, an alkyl group, a hydroxyalkyl group, a polyalkylene oxide group such as a polyethylene oxide group or a polypropylene oxide group, a sugar such as glucose, lactose, or sucrose, or a polymer having these sugars as a constituent unit, are also considered to be equivalent to polysaccharides and are included in the water-soluble polysaccharides of component (E).

[0026] Specific examples include mucopolysaccharides such as locust bean gum, guar gum, tamarind gum, quince seed-derived gum, gum arabic, tragacanth gum, karaya gum, carrageenan, alginic acid and salts thereof, pectin, hydroxypropyl guar gum, methylcellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, carboxymethyl cellulose, tuberose polysaccharide, xanthan gum, gellan gum, dextran, pullulan, hyaluronic acid and salts thereof, chondroitin sulfate and salts thereof, dermatan sulfate and salts thereof, chitin, and chitosan. Of these, from the viewpoints of improving compatibility during application, reducing the squeaky feeling on the skin after application, and improving the feeling of the skin being covered with a soft film after application, it is preferable to contain one or more selected from hyaluronic acid and salts thereof, carrageenan, and xanthan gum, more preferably to contain one or more selected from hyaluronic acid and salts thereof, and xanthan gum, and even more preferably to contain xanthan gum. As the salt of hyaluronic acid, a salt of hyaluronic acid with an alkali metal is preferred, and a salt with sodium is more preferred.

[0027] Component (E) can be used alone or in combination of two or more types, and the content is preferably 0.001 to 1 mass % of the total composition, more preferably 0.005 to 0.3 mass %, and even more preferably 0.01 to 0.1 mass %, from the viewpoints of improving compatibility during application, reducing the squeaky feeling on the skin after application, and improving the feeling that the skin is covered with a soft film after application.

[0028] In the present invention, the content of water in component (F) is preferably 40 to 90 mass %, more preferably 45 to 85 mass %, and even more preferably 50 to 80 mass %, of the total composition from the viewpoints of uniformly dispersing components (A) to (E) and improving the transparency of the appearance.

[0029] In addition to the above-mentioned components, the skin cosmetic of the present invention may contain components commonly used in cosmetics, such as surfactants other than component (A), oily components other than component (D), polyhydric alcohols other than component (C), polymeric compounds other than component (E), antioxidants, sequestering agents, preservatives, pH adjusters, blood circulation promoters, antiperspirants, disinfectants, skin activators, cooling agents, colorants, etc.

[0030] The skin cosmetic of the present invention can be produced according to a conventional method. From the viewpoint of improving the transparency of the appearance and improving the aesthetics by making the appearance transparent, the skin cosmetic of the present invention preferably has an appearance transmittance of 80% or more, more preferably 85% or more, and even more preferably 90% or more. The transmittance is measured by the method described in the Examples.

[0031] The skin cosmetic of the present invention can be, for example, a lotion, a beauty serum, an emulsion, etc., and is preferably a solubilized skin cosmetic, and is suitable as a lotion. From the viewpoint of improving compatibility during application, the skin cosmetic of the present invention preferably has a viscosity at 25°C of 1 to 3000 mPa·s, more preferably 10 to 2500 mPa·s, and even more preferably 15 to 2000 mPa·s. The viscosity is measured using a viscometer (DIGITAL VISMETRON, manufactured by Shibaura Semtech Co., Ltd.) with rotor No. 1 at 6 rpm for 30 seconds. [Example]

[0032] Examples 1 to 13, Comparative Examples 1 to 8 Skin cosmetics were prepared with the compositions shown in Table 1, and were evaluated for transmittance, compatibility during application, lack of a squeaky feeling on the skin after application, and the feel of the film on the skin after application. The results are also shown in Table 1.

[0033] (Manufacturing method) Components (A) and (D) were mixed uniformly to obtain an oil phase. Components (B), (C), (E), and (F) were mixed uniformly to obtain an aqueous phase. The oil phase was added to the aqueous phase and mixed uniformly to obtain a skin cosmetic.

[0034] (Evaluation method) (1) Transmittance (1 hour after production) One hour after production of the skin cosmetic, the transmittance was measured under the following measurement conditions. Note that for Comparative Example 1, which separated after one hour, it was marked as "separated" and no measurement was performed. Equipment: Transmittance measuring device UV-1800 (Shimadzu Corporation), Measurement wavelength: λ=650nm Cell: Disposable cell (PMMA for near UV), Here, a transmittance of 80% or more is considered to be acceptable, and a transmittance of less than 80% or separation is considered to be unacceptable.

[0035] (2) Good absorption during application: Three expert panelists applied each skin cosmetic to the back of their hand and massaged it in, evaluating its compatibility according to the following criteria. The results were expressed as the total score of the three panelists. 5: Very familiar. 4: It fits well. 3: Fairly familiar. 2: Unfamiliar. 1: Very unfamiliar.

[0036] (3) No rough feeling on the skin after application: Three expert panelists applied each skin cosmetic to the back of their hands and evaluated the feeling of roughness on the skin after massage according to the following criteria. The results are shown as the total score of the three panelists. The absence of a squeaky feeling means that when the cosmetic is applied to the skin, the fingers do not get caught. 5: No squeaking at all. 4: Almost no squeaking. 3: Doesn't squeak much. 2: Slightly creaky. 1: Very squeaky.

[0037] (4) Feeling of the film on the skin after application: Three expert panelists applied each skin cosmetic to the back of their hands and evaluated the film-like feel of the skin after massage (film-like feel) according to the following criteria. The results are shown as the total score of the three panelists. The film-like feeling refers to the sensation that the skin surface is covered with a soft cosmetic film. 5: It feels like a very soft film. 4: Feels like a soft film. 3: Feels slightly like a soft film. 2: Feels slightly hard and filmy. 1: It feels like a very hard film.

[0038] [Table 1]

[0039] Prescription examples 1-4 All of the skin cosmetics having the compositions shown in Tables 2 to 5 have a transparent appearance, blend well during application, do not leave a squeaky feeling on the skin after application, and leave a soft film-like feeling on the skin after application. The blended fragrance of component (D) used in Formulation Examples 1 to 4 has the composition shown in Table 6.

[0040] [Table 2]

[0041] [Table 3]

[0042] [Table 4]

[0043] [Table 5]

[0044] [Table 6]

Claims

1. The following components (A), (B), (C), (D), (E), and (F): (A) polyglycerol fatty acid ester, (B) ethanol 0.1 to 10 mass%; (C) 1 to 20 mass% of a trihydric or higher alcohol, (D) 0.01 to 0.3 mass% of an oil agent that is liquid at 25°C, (E) one or more water-soluble polymers selected from acrylic acid-based polymers and water-soluble polysaccharides; (F) Water A skin cosmetic containing

2. 2. The skin cosmetic according to claim 1, wherein the mass ratio (C) / (D) of component (C) to component (D) is 5 to 800.

3. 3. The skin cosmetic according to claim 1, wherein the mass ratio (A) / (D) of component (A) to component (D) is 0.05 to 50.

4. 3. The skin cosmetic according to claim 1, wherein the transmittance of the appearance is 80% or more.

5. 3. The skin cosmetic according to claim 1, wherein the content of component (A) is 0.01 to 1% by mass.

6. 3. The skin cosmetic according to claim 1, wherein the component (D) is a fragrance.

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