Oil-in-water emulsion cosmetics

Abstract

To provide an oil-in-water type emulsion cosmetic that can be stably used in a wide temperature range, and has excellent touch.SOLUTION: An oil-in-water type emulsion cosmetic contains the following components (A) to (D): (A) hydrocarbon oil containing hydrocarbon that is liquid at 25°C by 50 mass% or more; (B) xanthan gum; (C) bentonite; and (D) amino acid based anionic surfactant, where the content of component (B) is 0.15 to 0.4 mass%, and the content of component (A) is 73 mass% or more in the total oil phases.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to an oil-in-water emulsion cosmetic preparation. [Background technology]

[0002] In order to impart the occlusive properties of oils or a texture such as an emollient feel to a preparation, emulsions in which oils are dispersed in water are used. These oil-in-water emulsions include cosmetics such as non-fluid creams, fluid milks, and emulsified beauty serums. Among them, fluid milky emulsions using clay minerals can contain a relatively high concentration of oils and are suitable for the preparation of rich milky lotions, so they have been extensively studied. For example, there is a cream or emulsion-like skin cosmetic which is highly safe for the skin and has a good feel and appearance (texture, luster, etc.) by uniformly emulsifying an oily substance using a combination of bentonite and a water-soluble polymer (Patent Document 1); an emulsion-type cosmetic having excellent storage stability in which fine particles of titanium dioxide are dispersed in bentonite, a polyhydric alcohol, and a fatty acid ester (Patent Document 2); an oil-in-water emulsion composition in which the aqueous phase contains a water-swellable clay mineral, a polyglycerol fatty acid ester, and water (Patent Documents 3 and 4); Studies have been conducted on oil-in-water emulsion compositions which form pseudo-aggregated particles together with an inorganic salt and disperse in an aqueous phase, and have a good feel when used and good storage stability (Patent Document 5); oil-in-water emulsion compositions which contain a water-swellable clay mineral, a polar oil, a tetrahydric to hexahydric polyalcohol, and a water-soluble polymer, have a non-sticky, refreshing feel, and have excellent emulsion stability (Patent Document 6); and oil-in-water emulsion compositions which contain a water-swellable clay mineral, an anionic surfactant, a nonionic surfactant, a hydrophilic UV scattering agent, a fatty acid, and a sterol, have a high UV protection effect, and have excellent stability over time (Patent Document 7). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 56-150007 [Patent Document 2] Japanese Patent Application Publication No. 3-193710 [Patent Document 3] JP 2017-24999 A [Patent Document 4] JP 2018-104399 A [Patent Document 5] JP 2001-39827 A [Patent Document 6] JP 2017-8009 A [Patent Document 7] JP 2018-70477 A Summary of the Invention [Problem to be solved by the invention]

[0004] On the other hand, polymer thickeners are sometimes used to maintain the high temperature stability of fluid emulsions. However, when a certain amount or more of polymer thickeners are mixed, the texture may deteriorate, such as stickiness or poor compatibility. In addition, some emulsions that contain thickeners to improve high temperature stability may show an increase in viscosity at low temperatures. The increase in viscosity at low temperatures leads to the formulation becoming difficult to dispense from the container. In addition, the change in texture due to the increase in viscosity is a change in physical properties that is easy for customers to understand, and it causes discomfort, including the deterioration of the formulation, when used. In this way, maintaining a constant texture and physical properties over a wide temperature range by maintaining viscosity at both high and low temperatures is an important point when considering the formulation of cosmetics. Therefore, the present invention relates to a cosmetic preparation which can be stably used over a wide temperature range, spreads easily, is free of sliminess or stickiness, and has an excellent feel to the touch. [Means for solving the problem]

[0005] The present inventors have discovered that by using an oil phase containing at least a specific amount of a hydrocarbon oil, and an aqueous phase containing xanthan gum, bentonite, and an amino acid-based anionic surfactant, it is possible to obtain an oil-in-water emulsion cosmetic that is stable over a wide temperature range, spreads easily, is not slimy or sticky, and has an excellent feel to the touch.

[0006] The present invention relates to the following components (A) to (D): (A) a hydrocarbon oil containing 50% by mass or more of liquid hydrocarbons at 25°C; (B) xanthan gum, (C) Bentonite, (D) Amino acid-based anionic surfactants Contains The content of component (B) is 0.15 to 0.4 mass %, The present invention relates to an oil-in-water emulsion cosmetic, in which the content of component (A) in the total oil phase is 73 mass % or more. Effect of the Invention

[0007] The oil-in-water emulsion cosmetic of the present invention has excellent stability over a wide temperature range, spreads easily, is not slimy or sticky, and has an excellent feel to the touch. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] The hydrocarbon oil of component (A) used in the present invention may be any oil commonly used in cosmetics, such as paraffin, liquid paraffin, squalane, petrolatum, olefin oligomers, etc., and may be used alone or in combination of two or more kinds.

[0009] The hydrocarbon oil of component (A) contains 50% by mass or more of a hydrocarbon oil that is liquid at 25°C, and from the viewpoints of excellent stability, light spreadability, and non-stickiness, the content is preferably 55 to 100% by mass, and more preferably 57 to 95% by mass. Here, liquid means that the substance has flowability; specifically, if 50 g of the substance is placed in a 100 mL glass beaker and the beaker is turned over, the substance will flow out. Examples of hydrocarbon oils that are liquid at 25° C. include liquid paraffin, α-olefin oligomer, squalane, squalene, etc. These may be derived from animals or plants, and examples include sugar squalane, olive squalane, rice squalane, shark squalane, and squalane obtained by condensing terpenes produced by fermentation and then hydrogenating the squalane, etc. Among these, liquid paraffin and squalane are preferred from the viewpoints of high temperature stability and feel.

[0010] Among the hydrocarbon oils of component (A), examples of hydrocarbon oils that are solid or pasty (other than liquid) at 25°C include oils with a viscosity of 100 Pa s or more at 20°C, such as α-olefin oligomers, paraffin, petrolatum, adsorption-refined petrolatum, microcrystalline wax, etc. Of these, petrolatum is preferred from the standpoints of high-temperature stability and feel. In the present invention, it is preferable to combine one or more selected from liquid paraffin and squalane as a liquid hydrocarbon oil at 25°C with petrolatum as a solid or paste-like (other than liquid) hydrocarbon oil at 25°C.

[0011] The content of component (A) is preferably 9.5 to 22 mass %, and more preferably 11 to 20 mass %, of the total composition from the viewpoints of stability at high temperatures, inhibition of viscosity increase at low temperatures, and feel.

[0012] The oil-in-water emulsion cosmetic of the present invention may contain an oily component other than component (A) in the oil phase. Such an oily component may be any one that is used in ordinary cosmetics, for example, silicone oils such as dimethylpolysiloxane and cyclic silicone; triglycerides having a fatty acid group having 8 or less carbon atoms, such as glyceryl tri-2-ethylhexanoate; waxes such as beeswax, Japan wax, and carnauba wax; ester oils such as octyldodecyl myristate, cetyl palmitate, isostearyl isostearate, and isopropyl myristate; cetanol, behenyl alcohol, isostearyl alcohol, jojoba alcohol, oleyl alcohol, stearyl alcohol, long-chain branched aliphatic alcohols, and the like. higher alcohols such as sterol, cholesterol, phytosterol, branched fatty acid cholesterol ester, macadamia nut fatty acid phytosteryl ester, and other sterols and derivatives thereof; processed oils such as hardened oil; higher fatty acids such as stearic acid, myristic acid, iso-type long-chain fatty acid, and anteiso-type long-chain fatty acid; ethers such as dicapryl ether; terpenes such as limonene and hydrogenated bisabolol; triglycerides such as olive oil, jojoba oil, macadamia nut oil, medfoam oil, castor oil, safflower oil, sunflower oil, avocado oil, canola oil, apricot kernel oil, rice germ oil, and rice bran oil;Glyceryl triacetyl hydroxystearate, Glyceryl triacetyl ricinoleate, Glyceryl triisopalmitate, Glyceryl triisostearate, Glyceryl triundecanoate, Glyceryl trihydroxystearate, Glyceryl trioleate, Glyceryl tri(caprylic, capric, isostearic, adipate), Glyceryl tri(caprylic, capric, myristic, stearic acid), Glyceryl tri(caprylic, capric, lauric), Glyceryl tri(caprylic, capric, linoleic), Glyceryl tricaprate Synthetic glycerides such as ceryl, tritallow fatty acid glyceryl, tritallow fatty acid, mink oil fatty acid, cod liver fatty acid glyceryl, trimyristate glyceride, tristearate glyceryl tripalmitate, glyceryl tri-2-heptylundecanoate glyceryl, tribehenate glyceryl trimyristate, tritallow fatty acid, palmitic acid glyceryl, tricocoate glyceryl, trilaurate glyceryl, trilanolinate glyceryl, triricinoleate, caproate, caprylate, caprate, and trilinoleate glyceryl.

[0013] These oil components other than component (A) can be used alone or in combination of two or more. From the viewpoints of stability, light spreadability and non-stickiness, the content is preferably 0.1 to 8 mass % of the total composition, and more preferably 1 to 5 mass %. In addition, from the viewpoints of light spreadability, lack of sliminess and stickiness, and emulsion stability, the content of component (A) in the total oil phase is 73 mass% or more, preferably 73 to 95 mass%, more preferably 75 to 88 mass%, and even more preferably 78 to 85 mass%.

[0014] Xanthan gum, component (B) used in the present invention, is a polysaccharide produced by Xanthomonas campestris and is widely used as a thickening agent in cosmetics, food, and other fields. Examples of the santhic gum used in component (B) include commercially available products such as "Nomcoat Z" and "Nomcoat ZZ" manufactured by Nisshin Oillio Group, Ltd., "Sun Ace" manufactured by San-Ei Gen F.F.I., and "Echo Gum" manufactured by DSP Gokyo Food & Chemical Co., Ltd.

[0015] The content of xanthan gum as component (B) is 0.15 to 0.4 mass % of the total composition, and preferably 0.2 to 0.3 mass %, from the viewpoints of stability, light spreadability, and lack of sliminess and stickiness.

[0016] In addition, it is preferable that the xanthan gum of component (B) is pre-dispersed in an alcohol in an amount three times or more of the blend amount and blended in the aqueous phase of the oil-in-water emulsion cosmetic of the present invention. Examples of alcohols that can be used for pre-dispersion include dipropylene glycol, 1,3-butylene glycol, concentrated glycerin, propanediol, etc.

[0017] Bentonite, component (C), is a type of natural colloidal aluminum silicate hydrate that is highly pure and has cation exchange capacity, hydration capacity, and swelling capacity. The bentonite of component (C) preferably has a cation exchangeable sodium ion content of 100 to 160 milligram equivalents per 100 g, more preferably 115 to 140 milligram equivalents per 100 g. The viscosity of a 4.0 mass% aqueous solution is preferably 150 to 800 cP (B-type rotational viscometer, measured at 20°C). Such high-purity sodium-type bentonite is obtained from a specific vein or by physical or chemical processes.

[0018] The content of bentonite as component (C) is preferably 0.01 to 1 mass %, more preferably 0.05 to 0.8 mass %, and even more preferably 0.2 to 0.6 mass %, of the total composition from the viewpoints of stability, light elongation, and lack of slime and stickiness.

[0019] Furthermore, it is preferable that the bentonite of component (C) is pre-dispersed in at least 9 times the blend amount of water and blended in the aqueous phase of the oil-in-water emulsion cosmetic of the present invention.

[0020] The amino acid-based anionic surfactant of component (D) is one that is commonly used in cosmetics, and examples thereof include N-acyl sarcosine salt, surfactin or a salt thereof, N-acyl amino acid or a salt thereof, etc. Among these, surfactin or a salt thereof, and N-acyl amino acid or a salt thereof are preferred.

[0021] Surfactin or a salt thereof is a natural surfactant produced by a microorganism belonging to the genus Bacillus, such as Bacillus subtilis IAM 1213 strain, IAM 1069 strain, IAM 1259 strain, IAM 1260 strain, IFO 3035 strain, or ATCC 21332 strain. Examples of surfactin salts include metal salts of carboxyl groups derived from amino acids, which are constituent units of surfactin (alkali metal salts such as sodium, potassium, and lithium, and alkaline earth metal salts such as calcium and magnesium), and organic ammonium salts (trimethylamine salt, triethylamine salt, tributylamine salt, monoethanolamine salt, diethanolamine salt, triethanolamine salt, lysine salt, arginine salt, choline salt, etc.). Of these, it is preferable to use sodium surfactin (trade name: Kaneka Surfactin; manufactured by Kaneka Corporation) because of its ready availability on the market.

[0022] In the N-acyl amino acid or its salt, the amino acid constituting the N-acyl amino acid may be glutamic acid, aspartic acid, glycine, alanine, threonine, methylalanine, sarcosine, lysine, arginine, etc. These amino acids may be L-, D-, or DL-isomers. One of these may be used, or two or more selected from the above group may be mixed and used. From the viewpoint of dispersion stability and non-stickiness, acidic amino acids or neutral amino acids are more preferred. Specifically, glutamic acid, aspartic acid, glycine, and alanine are more preferred, and glutamic acid is even more preferred.

[0023] The acyl group constituting the N-acylamino acid is preferably an acyl group derived from a saturated or unsaturated, straight-chain or branched-chain fatty acid having 16 to 22 carbon atoms. Among them, an acyl group derived from a saturated fatty acid can be used well, and a single acyl group, an acyl group derived from beef tallow fatty acid, or a mixture thereof may be used. For example, the fatty acid may be palmitic acid, stearic acid, isostearic acid, oleic acid, linoleic acid, behenic acid, coconut oil fatty acid, palm oil fatty acid, hardened beef tallow fatty acid, etc., and these may be used alone or in combination of two or more. From the viewpoints of stability over time and non-stickiness, stearic acid, coconut oil fatty acid, and palm oil fatty acid are preferred, and stearic acid is more preferred.

[0024] The salt of N-acylamino acid is not limited, and examples thereof include inorganic salts of alkali metals such as sodium and potassium, calcium, magnesium, aluminum, zinc, etc., organic amines such as ammonia, monoethanolamine, diethanolamine, triethanolamine, etc., and organic salts of basic amino acids such as arginine and lysine, etc., and one or more of these can be used in combination. From the viewpoint of ease of availability on the market, the salts of sodium, potassium, triethanolamine, and arginine are preferred.

[0025] Specific examples of N-acylamino acid or its salt include N-palmitoyl glycine ammonium, N-stearoyl alanine sodium, N-palmitoyl aspartic acid triethanolamine, N-stearoyl glutamic acid sodium salt, N-stearoyl glutamic acid triethanolamine salt, N-palmitoyl glutamic acid potassium salt, N-palmitoyl glutamic acid triethanolamine salt, N-stearoyl glycine potassium salt, and N-stearoyl glutamic acid. Among these, N-stearoyl glutamic acid sodium salt, N-stearoyl glutamic acid triethanolamine salt, and N-stearoyl glutamic acid are preferred, and N-stearoyl glutamic acid sodium salt are more preferred. In addition, commercially available products such as Amisoft HS-11P (manufactured by Ajinomoto Healthy Supply Co., Ltd.) can be used.

[0026] The N-acylamino acid and / or its salt may be used as an N-acylamino acid salt having a counter base from the beginning, or may be used after neutralizing the N-long-chain acylamino acid with the counter base during emulsification. In the present invention, one or more of the above-mentioned components may be appropriately selected and used depending on the purpose.

[0027] The anionic surfactant of component (D) can be used alone or in combination with two or more kinds, and the content is preferably 0.1 to 1 mass % and more preferably 0.2 to 0.5 mass % in the total composition from the viewpoints of stability, light spreadability, and lack of sliminess and stickiness.

[0028] In the oil-in-water emulsion cosmetic of the present invention, the water content is preferably 45 to 80 mass% of the total composition, more preferably 50 to 75 mass%, and even more preferably 55 to 70 mass%, from the viewpoints of light spreadability and lack of sliminess and stickiness.

[0029] The oil-in-water emulsion cosmetic of the present invention may contain, in addition to the above-mentioned components, components used in ordinary cosmetics, for example, polyhydric alcohols such as glycerin, ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, and 1,3-butylene glycol; surfactants other than component (D), ethanol, preservatives, antioxidants, colorants, pH adjusters, fragrances, ultraviolet absorbers, moisturizers, blood circulation promoters, cooling agents, antiperspirants, disinfectants, skin activators, and the like.

[0030] The oil-in-water emulsion cosmetic of the present invention can be produced by a conventional method, for example, by appropriately mixing the prescribed components, and can be produced by uniformly mixing and dispersing all the components, regardless of the mixing order.

[0031] Furthermore, from the standpoints of stability and usability, the oil-in-water emulsion cosmetic of the present invention preferably has a viscosity at 0° C. of 1000 to 8000 mPa·s, and more preferably 1200 to 7000 mPa·s. Here, the viscosity is measured by a Brookfield viscometer.

[0032] The oil-in-water emulsion cosmetic of the present invention maintains its fluidity even at low temperatures, and therefore can be filled and used in containers with special functional structures, such as suction-type pump dispensers and airless discharge containers, as well as in flip-type bottle containers. EXAMPLES

[0033] Examples 1 to 18, Comparative Examples 1 to 17 Oil-in-water emulsion cosmetics having the compositions shown in Tables 1 to 3 were produced and evaluated for emulsion stability, low-temperature physical properties (viscosity), and application feel. The results are also shown in Tables 1 to 3. It should be noted that Examples 1 to 15 and 18 are reference examples.

[0034] (Manufacturing method) The oil phase and the water phase were dissolved and dispersed at 80°C, respectively, and then mixed and dispersed, and cooled to 32°C with stirring to obtain an oil-in-water emulsion cosmetic.

[0035] (Evaluation method) (1) Emulsion stability: Approximately 50 g of each cosmetic was placed in a glass bottle, which was then sealed and stored in a thermostatic chamber at 60°C, 45°C, and room temperature for 30 days each. The appearance was then visually observed. The results were evaluated according to the following criteria. ◎: No clear separation or other abnormalities at any temperature. ○: Clear abnormalities such as separation were observed at 60°C, but no change was observed at 45°C or room temperature. △: Clear abnormalities such as separation are observed at 60℃ and 45℃, but no change occurs at room temperature. ×: Separation occurs at any temperature.

[0036] (2) Low-temperature physical properties (viscosity): Approximately 50 g of each cosmetic was placed in a glass bottle, which was then stoppered and stored in a thermostatic chamber at 0° C. for 30 days. After that, the bottle was removed from the thermostatic chamber, and the viscosity was measured at 0° C. using a B-type viscometer. In cold places such as winter, if the fluidity is low (the viscosity is high), it is difficult to remove the cosmetic from the container. Even if it is possible to remove it, if it becomes creamy on the skin, the feel when spreading it is very different, and it does not satisfy the performance of the cosmetic, which is also a luxury item. For this reason, fluidity at low temperatures is required.

[0037] (3) Application feel: Approximately 20 g of each cosmetic was placed in a 30 mL bottle with a stopper opening of 5φ, and the bottle was then sealed and stored in a thermostatic chamber at 0°C for 30 days. Immediately after removing the bottle from the thermostatic chamber, the bottle was shaken out onto the skin and evaluated for spreadability, slipperiness, and non-stickiness after application. The results are shown according to the following criteria. ◎: Spreads easily, is not slimy, and does not feel sticky. Good: It spreads easily, but there is a slight sliminess when applied and stickiness after application. △: It spreads slowly and feels sticky after application. ×: The composition cannot be shaken out of the container, or even if it can be shaken out, it does not stretch.

[0038] [Table 1]

[0039] [Table 2]

[0040] [Table 3]

[0041] The ingredients marked with *1 to *14 in the table are as follows. *1: NIKKOL Sugar Squalane (manufactured by Nikko Chemicals) *2: Kaydor (manufactured by Sonneborn) *3: Chloratum V (manufactured by Croda) *4: White petrolatum (manufactured by Sonneborn) *5: Montex A (Miyoshi Oil Co., Ltd.: HLB 3.8) *6: DOWSIL FZ-209(-G) (Dow Toray) *7: Silicone KF-96A-6CS(-G) (manufactured by Shin-Etsu Chemical Co., Ltd.) *8: 5% aqueous solution of Kunipia G4 (manufactured by Kunimine Industries Co., Ltd.) *9: Amisoft HS-11P (manufactured by Ajinomoto Healthy Supply Co., Ltd.) *10: Kaneka Surfactin (manufactured by Kaneka Corporation) *11: RG(Co) (manufactured by NOF Corp.) *12: Hyaluronic acid FCH-SU (Kikkoman Biochemifa Corporation) *13: Carrageenan CS-67(N) (manufactured by San-Ei Gen F.F.I. Co., Ltd.) *14:Metolose 60SH-4000 (manufactured by Shin-Etsu Chemical Co., Ltd.)

Claims

1. The following components (A) to (D): (A) a hydrocarbon oil containing 50 mass% or more of liquid hydrocarbons at 25°C; (B) xanthan gum, (C) bentonite, (D) Amino acid-based anionic surfactant Contains Component (D) is surfactin or a salt thereof, The content of component (B) is 0.15 to 0.4 mass %, The content of component (A) in the total oil phase is 73% by mass or more, An oil-in-water emulsion cosmetic, comprising 0.1 to 0.3% by mass of component (D).

2. 2. The oil-in-water emulsion cosmetic according to claim 1, wherein the content of component (C) is 0.01 to 1% by mass of the total composition.

3. 3. The oil-in-water emulsion cosmetic according to claim 1, wherein the content of component (A) is 9.5 to 22% by mass of the total composition.

4. 4. The oil-in-water emulsion cosmetic according to claim 1, wherein the water content is 45 to 80% by mass of the total composition.

5. The oil-in-water emulsion cosmetic according to any one of claims 1 to 4, which is filled in a bottle container of a paper-type.

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