Skin cosmetics

Abstract

This skin cosmetic provides a rich texture upon application, a soft film-like feel after application, and a long-lasting film-like feel, along with excellent sustained moisturizing properties. [Solution] The following components (A), (B), (C), (D), (E), and (F): (A) Phospholipids, (B) Sterols, (C) Ethanol, (D) Xanthan gum, (E) Carboxyvinyl polymer which may be alkyl-modified, (F) Trehalose 0.2-5% by mass A skin cosmetic containing [a specific ingredient].

Description

Technical Field

[0001] The present invention relates to skin cosmetics.

Background Art

[0002] Conventionally, cosmetics that are non-greasy, have an excellent feeling in use, and have an excellent moisturizing effect have been studied. For example, Patent Document 1 describes that a gel-like external preparation for skin containing a water-soluble polymer selected from carboxyvinyl polymer, acrylic acid / alkyl methacrylate copolymer and salts thereof, a fatty acid ester of phospholipid, cholesterol or phytosterol, and a saturated monohydric alcohol having 1 to 3 carbon atoms has no sticky feeling during application, has good skin affinity, has a flexible film feeling, and is excellent in moisturizing feeling.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Conventional cosmetics had no firm feeling during application, the soft film feeling did not persist, and the moisturizing effect did not last sufficiently.

Means for Solving the Problems

[0005] The present inventors have found that by combining phospholipids, sterols, ethanol, xanthan gum, a carboxyvinyl polymer which may be alkyl-modified, and a specific amount of trehalose, a skin cosmetic having a firm feeling during application, a soft film feeling after application, the persistence of the film feeling, and excellent persistence of the moisturizing feeling can be obtained.

[0006] The present invention comprises the following components (A), (B), (C), (D), (E), and (F): (A) Phospholipids, (B) Sterols, (C) Ethanol, (D) Xanthan gum, (E) Carboxyvinyl polymer which may be alkyl-modified, (F) Trehalose 0.2-5% by mass This relates to skin cosmetics containing [specific ingredients / materials]. [Effects of the Invention]

[0007] The skin cosmetic of the present invention has a rich texture upon application, a soft film-like feel after application, and this film-like feel is long-lasting, providing excellent sustained moisturizing properties. [Modes for carrying out the invention]

[0008] In the present invention, the phospholipid component (A) preferably contains 60% by mass or more, more preferably 64% by mass or more, even more preferably 68% by mass or more, and even more preferably 70% by mass or more, from the viewpoint of improving the stability of suppressing crystal precipitation, obtaining a soft film-like feel after application, and improving the persistence of the soft film-like feel after application. Other phospholipid components besides phosphatidylcholine include phosphatidic acid, phosphatidylserine, phosphatidylethanolamine, phosphatidylinositol, phosphatidylglycerol, and the like.

[0009] The phospholipids used in this invention may be natural products extracted and purified from plants or animals, chemically synthesized products, or processed products such as hydrogenation or hydroxylation. As natural products, from the viewpoint of improving the stability of suppressing crystal precipitation and reducing skin irritation, phospholipids extracted from soybeans or egg yolks or purified products thereof are preferred, and hydrogenated or hydroxylated phospholipids are more preferred. Specifically, hydrogenated soybean lecithin and hydrogenated egg yolk lecithin are preferred, and hydrogenated soybean lecithin is more preferred.

[0010] The phosphatidylcholine content in phospholipids can be analyzed using methods such as thin-layer chromatography (TLC), high-performance liquid chromatography (HPLC), and IatroScan (manufactured by Yatron). For example, one method described in Japanese Patent Publication No. 2001-186898 involves spotting an organic solvent containing phospholipids onto a TLC plate, developing it with chloroform:methanol:acetic acid = 65:25:10, spraying with 50% sulfuric acid ethanol, heating, and then analyzing the phospholipids with a densitometer. Any method that can measure and calculate the phosphatidylcholine content and percentage in phospholipids is acceptable.

[0011] Phospholipids containing 60% or more phosphatidylcholine include: Coatsome NC-21 (hydrogenated soybean phospholipid; containing 90% or more phosphatidylcholine; manufactured by NOF Corporation), Resinol S-10E (hydrogenated soybean phospholipid; containing 75-85% phosphatidylcholine; manufactured by Nikko Chemicals Co., Ltd.), Resinol S-10EX (hydrogenated soybean phospholipid; containing 95% or more phosphatidylcholine; manufactured by Nikko Chemicals Co., Ltd.), Basis LS-60HR (hydrogenated soybean phospholipid; containing 60-75% phosphatidylcholine; manufactured by Nisshin Oillio Co., Ltd.), Phospholipon 85G (soybean phospholipid; containing 85% phosphatidylcholine; manufactured by H. Holstein Co., Ltd.), Phospholipon 90G (soybean phospholipid; containing 94% or more phosphatidylcholine; manufactured by H. Holstein Co., Ltd.), Phospholipon 75IP (Soybean phospholipid; containing 70% by mass of phosphatidylcholine; manufactured by H. Holstein), Phospholipon 90IP (Soybean phospholipid; containing 90% or more by mass of phosphatidylcholine; manufactured by H. Holstein), Phospholipon 80H (Hydrogenated soybean phospholipid; containing 70% or more by mass of phosphatidylcholine; manufactured by H. Holstein), Phospholipon 90H (Hydrogenated soybean phospholipid; containing 90% or more by mass of phosphatidylcholine; manufactured by H. Holstein), Phospholipon 75HIP (Hydrogenated soybean phospholipid; containing 70% or more by mass of phosphatidylcholine; manufactured by H. Holstein), Phospholipon 90HIP (Hydrogenated soybean phospholipid; containing 90% or more by mass of phosphatidylcholine; manufactured by H. Holstein), Lipoid E Lipoid E 80 (purified egg yolk phospholipid; contains 80% or more phosphatidylcholine by mass; manufactured by H. Holstein), Lipoid E 80 S (purified egg yolk phospholipid; contains 64% or more phosphatidylcholine by mass; manufactured by H. Holstein), Lipoid E PC S (purified egg yolk phospholipid; contains 96% or more phosphatidylcholine by mass; manufactured by H. Holstein), Epikron 200 (contains 95% or more phosphatidylcholine by mass; manufactured by Cargill), Phospholipid PCSH70 (hydrogenated soybean phospholipid; contains 70-80% phosphatidylcholine by mass;Examples include egg yolk lecithin PL-100E (containing approximately 83% by mass of phosphatidylcholine; manufactured by Kewpie Corporation), etc.

[0012] Component (A) can be one or more types, and its content is preferably 0.1 to 8% by mass of the total composition, more preferably 0.3 to 7% by mass, even more preferably 0.65 to 6% by mass, even more preferably 0.7 to 3% by mass, and especially preferably 0.8 to 2% by mass, from the viewpoint of improving the stability of suppressing crystal precipitation, improving the richness when applied, obtaining a soft film after application, improving the persistence of the soft film after application, and improving the persistence of moisturizing sensation.

[0013] As for component (B), sterols, compounds with a steroid skeleton and a melting point of 100°C or higher are preferred, such as cholesterol (melting point 149°C), cholestanol (melting point 141°C), lanosterol (melting point 139°C), brassicasterol (melting point 157°C), phytosterol (a mixture consisting of β-sitosterol (melting point 140°C), campesterol (melting point 157°C), and stigmasterol (melting point 170°C), with a mass ratio of 2:1:1), and γ-oryzanol (melting point 136°C). Furthermore, mixtures of animal and vegetable oils containing these sterols can also be used. Here, the melting point is measured according to the Melting Point Measurement Method, Method 1, of the 2006 Standards for Ingredients of Quasi-Drugs.

[0014] Of these, from the viewpoint of obtaining a soft film-like feeling after application, improving the persistence of the soft film-like feeling after application, and improving the persistence of the moisturizing effect, it is preferable to include one or more selected from cholesterol and phytosterols, and more preferably to include cholesterol.

[0015] Component (B) can be one or more types, and its content is preferably 0.1 to 1% by mass of the total composition, more preferably 0.15 to 0.75% by mass, even more preferably 0.25 to 0.65% by mass, and still more preferably 0.35 to 0.55% by mass, from the viewpoint of improving the stability of suppressing crystal precipitation, improving the richness when applied, obtaining a soft film after application, improving the persistence of the soft film after application, and improving the persistence of moisturizing effect.

[0016] In the present invention, the mass ratio (A) / (B) of component (A) to component (B) is preferably 0.6 to 30, more preferably 1 to 20, even more preferably 1.3 to 10, even more preferably 1.6 to 4, and especially preferably 1.8 to 2.7, from the viewpoint of improving the stability of suppressing crystal precipitation, improving the richness when applied, obtaining a soft film after application, improving the persistence of the soft film after application, and improving the persistence of moisturizing effect.

[0017] In the present invention, the ethanol content of component (C) is preferably 1 to 20% by mass, more preferably 2 to 15% by mass, even more preferably 3 to 12% by mass, and still more preferably 5 to 10% by mass, from the viewpoint of improving the stability of suppressing crystal precipitation, improving the richness when applied, obtaining a soft film after application, improving the persistence of the soft film after application, and improving the persistence of the moisturizing effect.

[0018] Component (D), xanthan gum, is a polysaccharide produced by Xanthomonas campestris and is widely used as a thickening agent in cosmetics, food, and other fields. For ingredient (D), santan gum, commercially available products such as "Nomucoat Z" and "Nomucoat ZZ" manufactured by Nisshin Oillio Group, "Sunace" manufactured by San-Ei Gen F.F.I., and "Echo Gum" manufactured by DSP Gokyo Food & Chemical Co., Ltd. can be used.

[0019] Component (D) can be used singly or in combination of two or more, and its content is preferably 0.01 to 0.8% by mass, more preferably 0.03 to 0.5% by mass, still more preferably 0.06 to 0.3% by mass, and even more preferably 0.08 to 0.2% by mass in the total composition from the viewpoints of obtaining a soft film feeling after coating, improving the persistence of the soft film feeling after coating, and improving the persistence of the moisturizing feeling.

[0020] Component (E) is a carboxyvinyl polymer which may be alkyl-modified, and is one or more selected from carboxyvinyl polymers and alkyl-modified carboxyvinyl polymers. Among these, examples of the carboxyvinyl polymer include polymers containing acrylic acid or methacrylic acid as a constituent monomer. Specifically, examples include Carbopol 980, Carbopol 981 (both from Lubrizol Advanced Materials), Syntalen L, Syntalen K (both from 3V Sigma), etc.

[0021] Examples of the alkyl-modified carboxyvinyl polymer include polymers containing an acrylate or methacrylate ester having an ester bond (alkyl modification) between acrylic acid or methacrylic acid and a fatty acid having 1 to 35 carbon atoms as a constituent monomer. Among them, those known as acrylic acid methacrylic acid alkyl copolymers ((acrylates / acrylic acid alkyl (C10-30)) copolymer) with an alkyl group having 10 to 30 carbon atoms are preferable from the viewpoints of improving the storage stability of suppressing crystal precipitation, improving the kokumi feeling during coating, and obtaining a soft film feeling after coating. Specifically, examples include Carbopol ETD2020, Carbopol 1382, Pemulen TR-1, Pemulen TR-2 (both are trademark names of Carbopol and from B.F. Goodrich), etc.

[0022] As for component (E), from the viewpoint of improving richness during application and obtaining a soft film after application, it is preferable to include one or more selected from carboxyvinyl polymer and alkyl acrylate methacrylate copolymer ((acrylates / alkyl acrylate (C10-30)) having 10 to 30 carbon atoms in the alkyl group, and it is more preferable to include carboxyvinyl polymer.

[0023] Component (E) can be one or more types, and its content is preferably 0.1 to 1% by mass, more preferably 0.2 to 0.8% by mass, and even more preferably 0.3 to 0.38% by mass, from the viewpoint of obtaining a soft film-like feeling after application, improving the persistence of the soft film-like feeling after application, and improving the persistence of the moisturizing feeling.

[0024] In the present invention, the mass ratio (D) / (E) of component (D) to component (E) is preferably 0.01 to 7, more preferably 0.04 to 3, even more preferably 0.1 to 1, even more preferably 0.22 to 0.55, and especially preferably 0.26 to 0.34, from the viewpoint of improving the richness when applied, obtaining a soft film after application, improving the persistence of the soft film after application, and improving the persistence of the moisturizing effect.

[0025] Component (F), trehalose, is a type of disaccharide, and there are three isomers, α,α-, α,β-, and β,β-, depending on the bonding configuration of the two D-glucose units. In this invention, any of these isomers can be used, or a mixture thereof. Trehalose is found in resurrection plants, shiitake mushrooms, yeast, etc., and can be obtained from these by known extraction methods or by synthetic methods.

[0026] Component (F) can be one or more types, and its content is 0.2 to 5% by mass of the total composition, preferably 0.3 to 4% by mass, more preferably 0.6 to 3.5% by mass, and even more preferably 0.8 to 2.5% by mass, from the viewpoint of obtaining a soft film-like feeling after application, improving the persistence of the soft film-like feeling after application, and improving the persistence of the moisturizing feeling.

[0027] In the present invention, the mass ratio (A) / (F) of component (A) to component (F) is preferably 0.03 to 20, more preferably 0.06 to 10, even more preferably 0.1 to 4, even more preferably 0.5 to 2.1, and especially preferably 0.8 to 1.5, from the viewpoint of improving the richness when applied, obtaining a soft film after application, improving the persistence of the soft film after application, and improving the persistence of the moisturizing effect.

[0028] In the present invention, the mass ratio (D) / (F) of component (D) to component (F) is preferably 0.003 to 2.5, more preferably 0.007 to 1.8, even more preferably 0.01 to 1, even more preferably 0.05 to 0.23, and especially preferably 0.08 to 0.15, from the viewpoint of improving the richness when applied, obtaining a soft film after application, improving the persistence of the soft film after application, and improving the persistence of the moisturizing effect.

[0029] The skin cosmetic composition of the present invention may further contain glycosyl trehalose, which provides a rich texture upon application and a soft film-like feel after application. In the glycosyltrehalose used in the present invention, the glycosyl group directly attached to the trehalose can be any monosaccharide or polysaccharide, as long as it is obtained by losing the hemiacetal hydroxyl group from the sugar molecule, and examples include glucosyl group, fructosyl group, galactosyl group, maltosyl group, maltotriosyl group, maltotetraosyl group, etc. The glycosyltrehalose preferably contains one or more selected from glucosyltrehalose, maltosyltrehalose, maltotriosyltrehalose, and maltotetraosyltrehalose, and more preferably contains one or more selected from glucosyltrehalose, maltosyltrehalose, and maltotriosyltrehalose.

[0030] Commercially available glycosyltrehalose can be used, for example, Tornare (glycosyltrehalose / hydrogenated starch hydrolysate mixed solution, manufactured by Nagase Vita Co., Ltd.). Tornare® is an aqueous solution consisting of glycosyltrehalose containing glucosyltrehalose, maltosyltrehalose, and maltotriosyltrehalose, hydrogenated starch hydrolysate containing sorbitol, maltitol, maltotriitol, maltotetraitol, and maltopentitol, and water, containing 47% by mass of glycosyltrehalose, 27% by mass of hydrogenated starch hydrolysate, and 26% by mass of water.

[0031] From the viewpoint of improving the richness when applied and obtaining a soft film-like texture after application, the glycosyltrehalose content is preferably 0.01 to 1% by mass in the total composition, more preferably 0.03 to 0.7% by mass, and even more preferably 0.04 to 0.5% by mass.

[0032] The skin cosmetic composition of the present invention may further contain polyhydric alcohols other than component (F) and glycosyl trehalose, which can provide a soft film-like feeling after application and improve the persistence of that soft film-like feeling after application. Such polyhydric alcohols are compounds that have two or more hydroxyl groups in their molecule, and any of those commonly used in cosmetics will suffice. Examples of dihydric alcohols include polyethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, polypropylene glycol, 1,3-butylene glycol, 1,3-propanediol, and pentanediol. Examples of trihydric alcohols include glycerin and trimethylolpropane. Examples of tetrahydric alcohols include diglycerin and erythritol. Examples of pentahydric or higher polyhydric alcohols include polyglycerins such as triglycerin; sugars and sugar alcohols such as glucose, maltose, maltose, sucrose, xylitol, sorbitol, maltitol, polyoxyethylene methyl glucoside, polyoxyethylene ethyl glucoside, and polyoxyethylene propylene glucoside.

[0033] Of these, from the viewpoint of improving the richness when applied, improving the persistence of the moisturizing effect after application, and suppressing stickiness after application, it is preferable to include one or more selected from polyethylene glycol, dipropylene glycol, 1,3-butylene glycol, 1,3-propanediol, glycerin, diglycerin, xylitol, sorbitol, maltitol, and polyoxyethylene ethyl glucoside; more preferably to include one or more selected from polyethylene glycol, dipropylene glycol, 1,3-butylene glycol, glycerin, diglycerin, sorbitol, maltitol, and polyoxyethylene ethyl glucoside; and even more preferably to include one or more selected from polyethylene glycol, dipropylene glycol, glycerin, diglycerin, and sorbitol.

[0034] Component (F) and polyhydric alcohols other than glycosyl trehalose can be used individually or in combination of two or more. From the viewpoint of improving the richness when applied, improving the persistence of the moisturizing effect after application, and suppressing stickiness, the content is preferably 10 to 40% by mass, more preferably 15 to 35% by mass, and even more preferably 20 to 30% by mass in the total composition.

[0035] In addition to the above-mentioned components, the skin cosmetic composition of the present invention may contain components commonly used in cosmetics, such as surfactants, oily components, other polymer compounds, antioxidants, chelating agents, fragrances, preservatives, pH adjusters, blood circulation promoters, antiperspirants, bactericides, skin activators, cooling agents, colorants, and the like.

[0036] The present invention provides a skin cosmetic composition in which, from the viewpoint of improving the richness when applied, obtaining a soft film after application, improving the persistence of the soft film after application, and improving the stability of appearance such as suppressing separation, the content of oily components other than components (A) and (B) in the total composition is preferably 10% by mass or less, more preferably 5% by mass or less, even more preferably 2% by mass or less, even more preferably 1% by mass or less, and especially preferably 0.1% by mass or less.

[0037] The skin cosmetic composition of the present invention can be manufactured according to conventional methods. For example, it can be manufactured by uniformly mixing a portion of the water with components (A) to (C) to prepare preparation 1, uniformly mixing the remaining water with the other components to prepare preparation 2, and then adding preparation 1 to preparation 2 and mixing uniformly.

[0038] The skin cosmetic composition of the present invention preferably has a viscosity of 9000 mPa·s or more at 25°C, more preferably 10000 to 50000 mPa·s, and even more preferably 12000 to 25000 mPa·s. In this invention, viscosity is measured at 25°C using a B-type viscometer (rotor No. 4, rotation speed 12 rpm, measurement time 30 seconds).

[0039] The skin cosmetic composition of the present invention can be used as a lotion, serum, emulsion, etc., and is particularly suitable as a serum. [Examples]

[0040] Examples 1-14, Comparative Examples 1-3 Skin cosmetics (serums) with the composition shown in Table 1 were manufactured, and their richness, soft film-like texture, duration of the soft film-like texture, and duration of moisturizing effect were evaluated. The results are also shown in Table 1.

[0041] (Manufacturing method) (1) A portion of the water and components (A), (B), and (C) were stirred at 60°C until homogenized, then cooled to 25°C to obtain preparation 1. (2) The remaining water and components (D), (E), (F) and other components were stirred at 25°C until uniformly mixed, and preparation 2 was obtained. (3) At 25°C, preparation 1 was added to preparation 2 and mixed uniformly to produce a skin cosmetic (beauty serum).

[0042] (Evaluation method) (1) Richness: Three expert panelists applied 0.1g of each skin cosmetic to the back of their hand and spread it with their fingers for 15 seconds. They then evaluated the feeling of richness during application according to the following criteria. The results are shown as the total score from the three panelists. Furthermore, "richness" refers to the feeling of resistance when applying the product to the fingers, giving the sensation that a skin cosmetic is being applied to the skin. 5; It has a very rich flavor. 4; It has a rich flavor. 3; It has a slightly rich flavor. 2; It lacks richness. 1; It lacks richness.

[0043] (2) Soft film-like feel: Three expert panelists applied 0.1g of each skin cosmetic to the back of their hand and spread it with their fingers for 15 seconds. They then evaluated the "soft film-like feel" according to the following criteria. The results are shown as the total score from the three panelists. Furthermore, "soft film sensation" refers to the feeling of being covered in a light, adhesive film when you touch your skin with your fingers after application. 5; It has a very soft, film-like texture. 4; It has a soft, film-like texture. 3; It has a slightly soft, film-like texture. 2; It doesn't have much of a soft, film-like texture. 1; It doesn't have a soft, film-like feel.

[0044] (3) Durability of the soft film-like feeling: Three expert panelists applied 0.1g of each skin cosmetic to the back of their hand, spread it with their fingers for 15 seconds, and then evaluated the soft film-like texture after 4 hours according to the following criteria. The results are shown as the total score from the three panelists. 5; It has a very long-lasting soft film-like feel. 4; It provides a long-lasting, soft, film-like feeling. 3; The soft, film-like feeling lasts for a while. 2; The soft, film-like feeling doesn't last very long. 1; The soft, film-like feeling does not last.

[0045] (4) Durability of moisturizing effect: Three expert panelists applied 0.1g of each skin cosmetic to the back of their hand, spread it with their fingers for 15 seconds, and then performed a sensory evaluation of the "moisture level" of their skin after 4 hours, according to the following criteria. The results are shown as the total score of the three panelists. 5; It's very moisturizing. 4. It feels moisturizing. 3; It has a slightly moisturizing feel. 2; It doesn't provide much moisture. 1; No moisturizing effect

[0046] [Table 1]

[0047] *1 Hydrogenated soybean phospholipid: COATSOME NC-21 (manufactured by NOF Corporation), *2 Cholesterol: Cholesterol JSQI (manufactured by Nippon Seika Co., Ltd.) *3 Ethanol: 95% synthetic alcohol (manufactured by Nippon Synthetic Alcohol Co., Ltd.) *4 Xanthan gum: Echo Gum (manufactured by MP Gokyo Food & Chemical Co., Ltd.) *5 Carboxyvinyl polymer: Syntalene L (manufactured by 3V Sigma SpA), *6 Carboxyvinyl polymer: Syntalen K (manufactured by 3V Sigma SpA), *7 Trehalose: Trehalose (manufactured by Nagase Vita Co., Ltd.) *8 Glycosyltrehalose / hydrogenated starch hydrolysis mixed solution: Tornare (manufactured by Nagase Vita Co., Ltd.)

[0048] Prescription Examples 1-2 Skin cosmetic compositions with the compositions shown in Tables 2 and 3 were prepared in the same manner as in Examples 1 to 14. Both the skin cosmetics in formulation examples 1 and 2 have a rich texture upon application, a soft film-like feeling after application, and this film-like feeling is long-lasting, resulting in excellent sustained moisturizing properties.

[0049] [Table 2]

[0050] [Table 3]

[0051] *9 Phytosterol: Phytosterol-S (manufactured by Tama Biochemical Co., Ltd.) *10 (Acrylates / C10-30 Alkyl Acrylate) Copolymer: Pemlen TR-1 (manufactured by BFGoodrich)

Claims

1. The following components (A), (B), (C), (D), (E), and (F): (A) Phospholipids, (B) Sterols, (C) Ethanol, (D) Xanthan gum, (E) Carboxyvinyl polymer which may be alkyl-modified, (F) Trehalose 0.2-5% by mass A skin cosmetic containing [a specific ingredient].

2. The skin cosmetic composition according to claim 1, wherein the mass ratio (A) / (F) of component (A) to component (F) is 0.03 to 20.

3. The skin cosmetic composition according to claim 1 or 2, wherein the mass ratio (D) / (F) of component (D) to component (F) is 0.003 to 2.

5.

4. A skin cosmetic composition according to claim 1 or 2, wherein the mass ratio (D) / (E) of component (D) to component (E) is 0.01 to 7.

5. The skin cosmetic composition according to claim 1 or 2, wherein the content of component (B) is 0.1 to 1% by mass.

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