Composition for skin cosmetics

Abstract

To provide a skin cosmetic composition having excellent transparency and storage stability when various components are blended.SOLUTION: There is provided a skin cosmetic composition comprising a disk-like micelle which comprises the following component A, the following component B, the following component C, the following component D and the following component E. Component A: a phospholipid, Component B: an acyl amino acid salt having an acyl amino acid structure in which one or more acyl group parts selected from the group consisting of a cocoyl group, a lauroyl group and a myristoyl group and an amino acid part which is glutamic acid and / or aspartic acid are bonded, component C: a fatty acid polyglyceryl in which an average degree of polymerization of polyglycerol is 10, which is an ester of a fatty acid having 8 to 18 carbon atoms and a polyglycerin, component D: a fatty acid monoglyceride which is an ester of a fatty acid having 8 to 12 carbon atoms and glycerin, component E: water.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a composition for skin cosmetics.

Background Art

[0002] Conventionally, since it has an emollient effect such as preventing the evaporation of moisture from the skin and softening the cutin, and contributes to moisturizing properties, attempts have been made to incorporate oil components into aqueous cosmetics. As a technique for incorporating oil components that are poorly soluble in water into aqueous cosmetics, techniques such as solubilization by micelles (for example, Patent Document 1), techniques using liposomes (closed vesicles) as carriers (for example, Patent Document 2), and techniques using bicelle structures as carriers (for example, Patent Documents 3 to 5) are known.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Patent Document 5

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, it has been extremely difficult to prepare a transparent aqueous cosmetic when a large amount of components poorly soluble in water such as oil components or water-soluble components are incorporated. For example, when forming micelles from a nonionic surfactant, the size of the micelles is usually about 10 to 20 nm, which is very small, and the space for incorporating oil components into the micelles is not sufficient, and the transparency may be insufficient.

[0005] Furthermore, there are problems with the technology using liposomes. Liposomes are on the order of 100 nm in size, which is larger than micelles, and allows for a greater concentration of various components within the liposome membrane. However, transparency decreases depending on the size of the liposomes, and storage stability is poor, especially when incorporated into low-viscosity lotion formulations.

[0006] Therefore, the object of the present invention is to provide a skin cosmetic composition that exhibits excellent transparency and storage stability when various components are incorporated into it. [Means for solving the problem]

[0007] As a result of diligent research to achieve the above objective, the present inventors have found that a skin cosmetic composition containing phospholipids, a salt of an acyl amino acid having a specific acyl amino acid structure, a specific fatty acid polyglyceryl, a specific fatty acid monoglyceryl, and water, and containing disc-shaped micelles, exhibits excellent transparency and storage stability when various components are incorporated. The present invention was completed based on these findings.

[0008] In other words, the present invention provides a skin cosmetic composition containing the following components A, B, C, D, and E, and including disc-shaped micelles. Component A: Phospholipids Component B: Salt of an acylamino acid having an acylamino acid structure in which one or more acyl group moieties selected from the group consisting of a cocoyl group, a lauroyl group, and a myristoyl group are bonded to an amino acid moiety that is glutamic acid and / or aspartic acid. Component C: Fatty acid polyglyceryl, which is an ester of a fatty acid with 8 to 18 carbon atoms and polyglycerol, with an average degree of polymerization of polyglycerol of 10. Component D: Fatty acid monoglyceryl, which is an ester of fatty acids with 8 to 12 carbon atoms and glycerol. Ingredient E: Water

[0009] Preferably, component B is component B1, component C is component C1, and component D is component D1. Component B1: Acyl amino acid salt selected from the group consisting of cocoyl glutamate, lauroyl glutamate, myristoyl glutamate, cocoyl aspartate, lauroyl aspartate, myristoyl aspartate, and dilauroyl glutamate lysine salt. Ingredient C1: One or more fatty acid polyglycerides selected from the group consisting of polyglyceryl-10 laurate, polyglyceryl-10 myristate, polyglyceryl-10 palmitate, polyglyceryl-10 stearate, polyglyceryl-10 caprylate, polyglyceryl-10 caprate, and polyglyceryl-10 oleate. Component D1: One or more monoglyceryl fatty acids selected from the group consisting of monoglyceryl laurate, monoglyceryl caprylate, and monoglyceryl caprate.

[0010] The component relative to the total amount of component A and component C A The mass ratio [A / (A+C)] is preferably 0.04 to 0.3.

[0011] The mass ratio of component D to the total amount of components A and C [D / (A+C)] is preferably 0.15 to 2.0.

[0012] The mass ratio of component B to the total amount of component A and component C [B / (A+C)] is preferably 0.3 to 4.0.

[0013] The above-mentioned skin cosmetic composition preferably further contains the following component F. Ingredient F: Oily component

[0014] The above-mentioned skin cosmetic composition preferably further contains the following component G. Component G: Linear or branched higher alcohols

[0015] Furthermore, the present invention provides a skin cosmetic comprising the above-mentioned skin cosmetic composition. [Effects of the Invention]

[0016] According to the composition for skin cosmetics of the present invention, when various components are blended, it is excellent in transparency and storage stability. Therefore, even when a relatively large amount of various components such as components poorly soluble in water such as oil components are blended, the composition for skin cosmetics is excellent in transparency and storage stability.

Mode for Carrying Out the Invention

[0017] The composition for skin cosmetics of the present invention contains at least phospholipid; a salt of acyl amino acid having an acyl amino acid structure in which one or more acyl group portions selected from the group consisting of a cocoyl group, a lauroyl group, and a myristoyl group are bonded to an amino acid portion which is glutamic acid and / or aspartic acid; a fatty acid polyglyceryl which is an ester of a fatty acid having 8 to 18 carbon atoms and polyglycerin and the average degree of polymerization of polyglycerin is 10; a fatty acid monoglyceryl which is an ester of a fatty acid having 8 to 12 carbon atoms and glycerin; and water.

[0018] In the present specification, the phospholipid may be referred to as "Component A", the salt of acyl amino acid having an acyl amino acid structure in which one or more acyl group portions selected from the group consisting of a cocoyl group, a lauroyl group, and a myristoyl group are bonded to an amino acid portion which is glutamic acid and / or aspartic acid may be referred to as "Component B", the fatty acid polyglyceryl which is an ester of a fatty acid having 8 to 18 carbon atoms and polyglycerin and the average degree of polymerization of polyglycerin is 10 may be referred to as "Component C", the fatty acid monoglyceryl which is an ester of a fatty acid having 8 to 12 carbon atoms and glycerin may be referred to as "Component D", and water may be referred to as "Component E".

[0019] The composition for skin cosmetics of the present invention may further contain an oily component. In the present specification, the above oily component may be referred to as "Component F". Further, the composition for skin cosmetics of the present invention may further contain a linear or branched higher alcohol. In the present specification, the above linear or branched higher alcohol may be referred to as "Component G".

[0020] In other words, the skin cosmetic composition of the present invention comprises at least component A, component B, component C, component D, and component E. The skin cosmetic composition of the present invention may further comprise component F and / or component G. Furthermore, the skin cosmetic composition of the present invention may comprise components other than those listed above (components A to G). In addition, each component contained in the skin cosmetic composition of the present invention, for example, component A, component B, component C, component D, component F, component G, and other components, may be used individually or in combination of two or more.

[0021] The present invention provides a skin cosmetic composition containing disc-shaped micelles. These disc-shaped micelles have a disc-shaped lipid bilayer structure (a so-called bicelle structure) containing components A to D as constituent components. The disc-shaped micelles may form a spherical or columnar structure in which multiple disc-shaped micelles are stacked in a planar manner. The disc-shaped micelles have a particle size of about 20 to 100 nm, which is intermediate between micelles and liposomes. The disc-shaped micelles can incorporate water-insoluble components such as oily components and aqueous components into their structure. Furthermore, the embodiment containing the disc-shaped micelles also exhibits excellent transparency. In addition, the present invention provides a skin cosmetic composition containing liposomes in addition to disc-shaped micelles.

[0022] [Component A] Component A is a phospholipid. Component A is the main component that forms the disc-shaped micelles described above. Component A may be used alone or in combination of two or more types.

[0023] Component A is a complex lipid containing phosphate residues, and examples include natural phospholipids, synthetic phospholipids, and hydrogenated phospholipids in which the unsaturated carbon chain of naturally derived phospholipids is saturated with hydrogen. Examples of the above phospholipids include natural phospholipids such as phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, phosphatidylinositol, lysophosphatidylcholine, sphingomyelin, egg yolk lecithin, and soy lecithin; synthetic phospholipids such as dilauroyl phosphatidylcholine, dimyristoyl phosphatidylcholine, dipalmitoyl phosphatidylcholine, distearoyl phosphatidylcholine, dioleoyl phosphatidylcholine, and palmitoyl oleoyl phosphatidylcholine; and hydrogenated phospholipids such as hydrogenated soy lecithin, hydrogenated egg yolk lecithin, hydrogenated phosphatidylcholine, and hydrogenated phosphatidylserine. Of these, hydrogenated phospholipids are preferred from the viewpoint of excellent storage stability, and hydrogenated soy lecithin is more preferred.

[0024] For ingredient A, commercially available products can be used. Examples of commercially available hydrogenated soy lecithin include the product names "COATSOME NC-21" and "COATSOME NC-61" (both manufactured by NOF Corporation), "NIKKOL Resinol S-10EX", "NIKKOL Resinol S-10E", and "NIKKOL Resinol S-10M" (all manufactured by Nikko Chemicals Co., Ltd.), "Basis LS-60HR" (manufactured by Nisshin Oillio Group Ltd.), "phytopresome OR", and "phytopresome" (both manufactured by Nippon Seika Co., Ltd.).

[0025] In the skin cosmetic composition of the present invention, the mass ratio of component A to the total amount of component A and component C [A / (A+C)] is preferably 0.04 to 0.3, more preferably 0.04 to 0.2, even more preferably 0.05 to 0.19, even more preferably 0.06 to 0.19, and particularly preferably 0.07 to 0.18. When the above mass ratio is 0.04 or higher, disc-shaped micelles can be formed more stably. When the above mass ratio is 0.3 or lower, the amount of excess component A that does not form disc-shaped micelles is reduced, resulting in superior transparency.

[0026] [Component B] Component B is a salt of an acylamino acid having an acylamino acid structure in which one or more acyl group moieties selected from the group consisting of a cocoyl group, a lauroyl group, and a myristoyl group are bonded to an amino acid moiety that is glutamic acid and / or aspartic acid. It is presumed that component B partially enters the gaps in the bilayer structure formed by components A, C, and D, and repels from component B that does not enter the gaps, thereby making the formed disc-shaped micelles small in size and resulting in excellent transparency of the skin cosmetic composition. Component B may be used alone or two or more types may be used.

[0027] Examples of the above acyl amino acid structures include cocoyl glutamate, lauroyl glutamate, myristoyl glutamate, cocoyl aspartate, lauroyl aspartate, and myristoyl aspartate. Component B may have only one of the above acyl amino acid structures, or it may have two or more. Furthermore, in the above acyl amino acid structure, the acyl group may be bonded to only one carboxyl group of the amino acid portion, or it may be bonded to two carboxyl groups.

[0028] The above acyl-amino acid structure may have only one type of acyl group and one type of amino acid, or it may have two or more types.

[0029] The acyl amino acid having the above-described acyl amino acid structure may also have other acyl group portions other than the cocoyl group, lauroyl group, and myristoyl group, as well as other amino acid portions other than glutamic acid and aspartic acid. Examples of these other amino acid portions include lysine.

[0030] The above-mentioned other acyl group portion may be bound to glutamic acid and / or aspartic acid, or to the above-mentioned other amino acid portion. Furthermore, the above-mentioned other amino acid portion may be bound to any of the cocoyl group, lauroyl group, myristoyl group, the above-mentioned other acyl group portion, glutamic acid, and aspartic acid.

[0031] The above amino acid portion (glutamic acid and / or aspartic acid) may be bound to other amino acids such as glutamic acid, aspartic acid, the other amino acids mentioned above, or other acyl group amino acid structures, in addition to being bound to the above acyl group portion. Examples of such acyl amino acids include dilauroyl glutamic acid lysine.

[0032] Component B is a salt of an acyl amino acid, and the glutamic acid portion and / or aspartic acid portion of the acyl amino acid structure may form a salt, or if other amino acid portions are present, the other amino acid portions may form a salt. Alkali metal salts are preferred as the salt, and sodium salts and potassium salts are more preferred.

[0033] Examples of component B include cocoyl glutamate, lauroyl glutamate, myristoyl glutamate, cocoyl aspartate, lauroyl aspartate, myristoyl aspartate, and dilauroyl glutamate lysine salt. In this specification, one or more acyl amino acid salts selected from the group consisting of cocoyl glutamate, lauroyl glutamate, myristoyl glutamate, cocoyl aspartate, lauroyl aspartate, myristoyl aspartate, and dilauroyl glutamate lysine salt may be referred to as "component B1". Among these, component B1 is preferred as component B.

[0034] More specifically, examples of component B1 include sodium cocoyl glutamate, potassium cocoyl glutamate, sodium lauroyl glutamate, potassium lauroyl glutamate, sodium myristoyl glutamate, potassium myristoyl glutamate, sodium cocoyl aspartate, potassium cocoyl aspartate, sodium lauroyl aspartate, potassium lauroyl aspartate, sodium myristoyl aspartate, potassium myristoyl aspartate, sodium dilauroyl glutamate lysine, and potassium dilauroyl glutamate lysine.

[0035] In the skin cosmetic composition of the present invention, the mass ratio of component B to the total amount of component A and component C [B / (A+C)] is preferably 0.3 to 4.0, more preferably 0.3 to 2.2, even more preferably 0.4 to 2.1, and particularly preferably 0.5 to 2.0. When the above mass ratio is 0.3 or higher, the size of the formed disc-shaped micelles can be made smaller, resulting in superior transparency of the skin cosmetic composition. When the above mass ratio is 4.0 or lower, foaming and clouding of the skin cosmetic composition can be made less likely.

[0036] [Component C] Component C is an ester of a fatty acid with 8 to 18 carbon atoms and polyglycerin, and is a fatty acid polyglyceryl with an average degree of polymerization of 10. Component C has a large polarity difference from component A, mainly forming the edges of disc-shaped micelles, increasing the curvature of the bilayer structure, and enabling smaller disc-shaped micelles. It also exhibits excellent low irritation to the skin. Component C may be used alone or in combination of two or more types.

[0037] The number of carbon atoms in the fatty acids in component C is 8 to 18, preferably 8 to 16. Keeping the number of carbon atoms within this range allows for small disc-shaped micelles. The number of carbon atoms in the fatty acids in component C refers to the total number of carbon atoms in the fatty acids within component C. These fatty acids may be saturated or unsaturated fatty acids.

[0038] Examples of component C include polyglyceryl-10 laurate, polyglyceryl-10 myristate, polyglyceryl-10 palmitate, polyglyceryl-10 stearate, polyglyceryl-10 caprylate, polyglyceryl-10 caprate, and polyglyceryl-10 oleate. In this specification, one or more fatty acid polyglyceryls selected from the group consisting of polyglyceryl-10 laurate, polyglyceryl-10 myristate, polyglyceryl-10 palmitate, polyglyceryl-10 stearate, polyglyceryl-10 caprylate, polyglyceryl-10 caprate, and polyglyceryl-10 oleate may be referred to as "component C1". Among these, component C1 is preferred as component C.

[0039] The total proportion of component A and component C in the skin cosmetic composition of the present invention is preferably 0.0001 to 10.0% by mass, more preferably 0.0005 to 8.0% by mass, and even more preferably 0.001 to 6.0% by mass, based on 100% by mass of the total amount of the skin cosmetic composition of the present invention. When the above total proportion is 0.0001% by mass or more, a sufficient amount of disc-shaped micelles are formed, resulting in superior transparency and storage stability. When the above total proportion is 10.0% by mass or less, the amount of excess component A and component C that do not form disc-shaped micelles is reduced, resulting in superior transparency.

[0040] [Component D] Component D is a fatty acid monoglyceryl, which is an ester of a fatty acid with 8 to 12 carbon atoms and glycerin. Component D has a large polarity difference with component A and is presumed to penetrate between component C at the edges of the disc-shaped micelle film formed mainly by component C, reinforcing the edges by increasing their density, thereby stabilizing the disc-shaped micelles and providing excellent storage stability. It also exhibits excellent low irritation to the skin. Component D may be used alone or in combination of two or more types.

[0041] Examples of component D include monoglyceryl laurate, monoglyceryl caprylate, and monoglyceryl caprate. In this specification, one or more fatty acid monoglycerides selected from the group consisting of monoglyceryl laurate, monoglyceryl caprylate, and monoglyceryl caprate may be referred to as "component D1". Among these, component D1 is preferred as component D.

[0042] In the skin cosmetic composition of the present invention, the mass ratio of component D to the total amount of component A and component C [D / (A+C)] is preferably 0.15 to 2.0, more preferably 0.3 to 2.0, even more preferably 0.35 to 1.95, and particularly preferably 0.4 to 1.9. When the above mass ratio is 0.15 or higher, the disc-shaped micelles are more stabilized and storage stability is improved. When the above mass ratio is 2.0 or lower, the thickening of the skin cosmetic composition can be suppressed.

[0043] [Component E] Component E is water. Component E is the matrix of the skin cosmetic composition of the present invention. Furthermore, by including component E, the skin cosmetic composition of the present invention can be given a fresh and refreshing feel, and the skin cosmetic composition of the present invention can be applied to skin cosmetics such as water-based lotions.

[0044] The content of component E in the skin cosmetic composition of the present invention is preferably 30.0 to 99.0% by mass, more preferably 35.0 to 95.0% by mass, and even more preferably 40.0 to 90.0% by mass, based on 100% by mass of the total amount of the skin cosmetic composition of the present invention.

[0045] [Component F] Component F is an oily component. Examples of component F include vegetable oils, ester oils, silicone oils, hydrocarbon oils, waxes, higher fatty acids, and higher alcohols other than component G. The skin cosmetic composition of the present invention can incorporate a large amount of component F by including the above-mentioned disc-shaped micelles. In the skin cosmetic composition of the present invention, component F can be used as an emollient component that prevents moisture evaporation from the skin and softens the stratum corneum. Component F may be used alone or two or more types. Component F does not include any component corresponding to component G.

[0046] Examples of the above-mentioned vegetable oils include macadamia nut oil, eucalyptus oil, coconut oil, avocado oil, safflower oil, olive oil, palm oil, palm kernel oil, kukui nut oil, shea butter, cocoa butter, almond oil, sunflower oil, rosehip oil, olive squalane, camellia oil, kiwi fruit seed oil, camellia oil, apricot kernel oil, sesame oil, soybean oil, jojoba oil, castor oil, hazelnut oil, meadowfoam oil, peppermint oil, argan oil, carrot oil, lavender oil, sugar squalane, damask rose flower wax, centifolia rose flower wax, jasmine flower wax, camellia oil, and hydrogenated versions of these (e.g., hydrogenated castor oil, hydrogenated jojoba oil, hydrogenated palm oil, hydrogenated avocado oil, hydrogenated soybean oil, etc.).

[0047] Examples of the above ester oils include ethyl oleate, isopropyl myristate, isopropyl palmitate, myristyl myristate, cetyl palmitate, 2-ethylhexyl palmitate, octyldodecyl myristate, isopropyl isostearate, propylene glycol isostearate, cetyl 2-ethylhexanoate, glyceryl tri-2-ethylhexanoate, caprylic / capric triglyceride, isononyl isononanoate, diisopropyl adipate, pentaerythrityl tetraethylhexanoate, pentaerythrityl tetraoctanoate, and pentaerythrityl tetraisostearate. Examples include diisostearyl malate, erythrityl triethylhexanoate, 2-ethylhexyl hydroxystearate, hexa(hydroxystearate / stearate / rosinate)dipentaerythrityl, tetra(hydroxystearate / isostearate)dipentaerythrityl, hexahydroxystearate dipentaerythrityl, (ethylhexanoate / stearate / adipate)glyceryl, tri(caprylic / capric / myristic / stearate)glyceryl, hexa(behenate / benzoate / ethylhexanoate)dipentaerythrityl, and alkyl benzoate (C12-15).

[0048] The above-mentioned silicone oils are not particularly limited, but examples include dimethyl silicone oils such as methylpolysiloxane and highly polymerized methylpolysiloxane; methylphenyl silicone oils such as methylphenylpolysiloxane; cyclic silicone oils such as methylcyclopolysiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane; amino-modified silicones such as aminopropylmethylsiloxane-dimethylsiloxane copolymer, aminoethylaminopropylsiloxane-dimethylsiloxane copolymer, and aminoethylaminopropylmethylsiloxane-dimethylsiloxane copolymer; carboxy-modified silicones, fatty acid-modified silicones, alcohol-modified silicones, aliphatic alcohol-modified silicones, epoxy-modified silicones, fluorine-modified silicones, and alkyl-modified silicones; and methylhydrogenpolysiloxane and dimethiconol.

[0049] Examples of the hydrocarbon oils mentioned above include α-olefin oligomers, petrolatum, isoparaffins, light isoparaffins, light liquid isoparaffins, squalane, synthetic squalane, vegetable squalane, liquid isoparaffins, liquid paraffins, hydrogenated polyisobutene, hydrogenated (tetradecenyl / methylpentadecene), isododecane, and the like.

[0050] Examples of the waxes mentioned above include carnauba wax, candelilla wax, beeswax, rice bran wax, shellac wax, whale wax, lanolin, and sunflower seed wax.

[0051] Examples of the above-mentioned higher fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid, and oleic acid.

[0052] Examples of higher alcohols other than component G mentioned above include alicyclic higher alcohols such as sterols.

[0053] Component F preferably contains a component having a sterol skeleton, and more preferably contains sterols and / or sterol esters. The above sterols and sterol esters are presumed to adjust the curvature of the bilayer structure, thereby contributing to the stabilization of the bilayer structure. They are also included as active ingredients for improving the skin's barrier function, etc. Examples of sterols and / or sterol esters include animal sterols and plant sterols (phytosterols), such as cholesterol, cholestanol, 7-dehydrocholesterol, sitosterol, stigmasterol, fucosterol, spinasterol, brassicasterol, and γ-oryzanol.

[0054] The mass ratio of component F to the total amount of components A and C in the skin cosmetic composition of the present invention [F / (A+C)] is not particularly limited, but is preferably 0.01 or higher, more preferably 0.02 or higher. The above mass ratio is preferably 1.0 or lower, more preferably 0.8 or lower, and even more preferably 0.5 or lower. When the above mass ratio is within the above range, the storage stability is further improved. Note that component F is an optional component and may not be included. That is, the above mass ratio [F / (A+C)] may be 0.

[0055] [Ingredient G] Component G is a linear or branched higher alcohol. The inclusion of component G reduces the crystallinity of the disc-shaped micelles, resulting in improved storage stability. Component G may be used alone or in combination of two or more types.

[0056] Component G is preferably a monohydric aliphatic alcohol having 12 to 24 carbon atoms, and more preferably a monohydric aliphatic alcohol having 14 to 22 carbon atoms.

[0057] Examples of linear higher alcohols include lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, cetostearyl alcohol, and behenyl alcohol. Examples of branched higher alcohols include octyldodecanol, decyltetradecanol, and isostearyl alcohol. Among these, branched higher alcohols are preferred from the viewpoint of superior storage stability, and octyldodecanol and decyltetradecanol are more preferred.

[0058] The mass ratio of component G to the total amount of component A and component C in the skin cosmetic composition of the present invention [G / (A+C)] is not particularly limited, but is preferably 0.01 or higher, and more preferably 0.02 or higher. A mass ratio of 0.01 or higher provides superior storage stability. A mass ratio of 1.0 or lower is preferred, more preferably 0.7 or lower, and even more preferably 0.5 or lower. A mass ratio of 1.0 or lower provides superior transparency.

[0059] The skin cosmetic composition of the present invention may contain a 1,2-alkanediol having 5 to 10 carbon atoms from the viewpoint of improving preservative properties. In this specification, the above-mentioned "1,2-alkanediol having 5 to 10 carbon atoms" may be referred to as "component H". Component H may be used alone or two or more types.

[0060] Examples of component H include 1,2-pentanediol (pentylene glycol), 1,2-hexanediol, 1,2-heptanediol, 1,2-octanediol (caprylyl glycol), and 1,2-decanediol. Among these, 1,2-pentanediol (pentylene glycol) is preferred.

[0061] [Other ingredients] The skin cosmetic composition of the present invention may further contain other components in addition to components A to H described above. These other components are not particularly limited, but examples include surfactants other than component B (cationic surfactants, anionic surfactants, nonionic surfactants, amphoteric surfactants, etc.), lower alcohols, polyhydric alcohols, UV absorbers, powders, antioxidants, preservatives, fragrances, colorants, chelating agents, cooling agents, thickeners, vitamins, neutralizing agents, amino acids, pH adjusters, whitening agents, anti-inflammatory agents, deodorants, plant and animal extracts, metal ion sequestering agents, and other additives. Only one of these other components may be used, or two or more may be used.

[0062] A preferred embodiment of the skin cosmetic composition of the present invention comprises components A to E, component G, and component H, wherein the content of component B is 2.0 to 10.0% by mass (preferably 4.0 to 10.0% by mass) based on 100% by mass of the total amount of the skin cosmetic composition of the present invention.

[0063] From an aesthetic standpoint, the appearance of the skin cosmetic composition of the present invention is preferably transparent. Furthermore, high transparency of the skin cosmetic composition of the present invention means that aggregation or creaming of the incorporated oily components has not occurred, indicating a very stable state. For this reason, the transparency of the skin cosmetic composition of the present invention also serves as an indicator of storage stability.

[0064] The pH of the skin cosmetic composition of the present invention is not particularly limited, but is preferably 5.0 to 8.0 at 25°C.

[0065] The viscosity of the skin cosmetic composition of the present invention is not particularly limited, but for example, a viscosity of 0.5 to 1000 mPa·s at 25°C is preferred, and more preferably 0.5 to 500 mPa·s. Viscosity measurement is performed using a B-type viscometer, selecting a rotor appropriate for the viscosity, and at a rotation speed of 60 r / min.

[0066] The average particle size of the disc-shaped micelles of the skin cosmetic composition of the present invention is not particularly limited, but is preferably 20 nm or more, more preferably 30 nm or more, and even more preferably 40 nm or more. When the average particle size is 20 nm or more, space can be secured within the disc-shaped micelles to incorporate various components (such as component F and water-soluble components). The average particle size is preferably 100 nm or less, more preferably 90 nm or less, and even more preferably 80 nm or less. When the average particle size is 100 nm or less, storage stability and transparency are improved. The average particle size (nm) can be measured using a dynamic light scattering photometer or a transmission electron microscope (TEM).

[0067] The skin cosmetic composition of the present invention can be prepared by mixing the above-mentioned components and stirring them using a known method, such as a homomixer.

[0068] Furthermore, skin cosmetics such as lotions can be manufactured by mixing the skin cosmetic composition of the present invention with components used in skin cosmetics. In other words, the skin cosmetic composition of the present invention can be used as a raw material (so-called intermediate raw material) for the manufacture of skin cosmetics. By using the skin cosmetic composition of the present invention, various components, such as water-insoluble components like component F, can be stably dispersed in aqueous or low-viscosity dispersion media, thus enabling the incorporation of various components into skin cosmetics. Moreover, the skin cosmetic composition of the present invention can also be used as a skin cosmetic on its own.

[0069] In the present invention, a skin cosmetic containing the above-described skin cosmetic composition of the present invention is obtained. In this specification, the above-described "skin cosmetic containing the skin cosmetic composition of the present invention" may be referred to as "the skin cosmetic of the present invention." The content ratio of the skin cosmetic composition of the present invention in 100% by mass of the skin cosmetic of the present invention is not particularly limited, but is preferably 0.1 to 100% by mass, and more preferably 0.5 to 10.0% by mass.

[0070] The dosage form of the skin cosmetic composition (or skin cosmetic) of the present invention is not particularly limited, but various dosage forms such as lotion, cream, gel, emulsion, aerosol spray, natural spray, stick, powder, roll-on, and sheet (paper) are available. Among these, lotion, cream, gel, and emulsion are preferred, and lotion is more preferred.

[0071] The skin cosmetic composition (or skin cosmetic) of the present invention is not particularly limited, but examples include skin care cosmetics such as moisturizing cosmetics, whitening cosmetics, acne care cosmetics, and anti-aging cosmetics (for example, aimed at wrinkle suppression, sagging suppression, etc.); scalp care cosmetics (for example, aimed at moisturizing, sebum suppression, etc.); deodorant cosmetics; sunscreen cosmetics; shaving cosmetics; body cleansers (for example, body shampoo, bar soap, etc.) for the scalp, etc. Among these, the skin cosmetic composition (or skin cosmetic) of the present invention is preferably a skin care cosmetic or a scalp care cosmetic, and more preferably a skin care cosmetic. The skin cosmetic composition (or skin cosmetic) of the present invention may be, for example, a cosmetic, a quasi-drug, a pharmaceutical, or a general merchandise item.

[0072] The areas to which the skin cosmetic composition (or skin cosmetic) of the present invention is applied are not particularly limited, and include the face (e.g., forehead, around the eyes, corners of the eyes, cheeks, around the mouth, etc.), arms, elbows, back of the hands, fingertips, feet, knees, heels, neck, armpits, back, scalp, etc.

[0073] The present invention provides a skin cosmetic composition using water (component E) as a medium, comprising: a phospholipid (component A); a salt of an acylamino acid having an acylamino acid structure in which one or more acyl group moieties selected from the group consisting of a cocoyl group, a lauroyl group, and a myristoyl group are bonded to an amino acid moiety which is glutamic acid and / or aspartic acid (component B); fatty acid polyglyceryl (component C), which is an ester of a fatty acid having 8 to 18 carbon atoms and polyglycerin, with an average degree of polymerization of polyglycerin of 10; and fatty acid monoglyceryl (component D), which is an ester of a fatty acid having 8 to 12 carbon atoms and glycerin. The disc-shaped micelles in the skin cosmetic composition of the present invention are composed of component A as the center, with components B, C, and D. Although the roles of each of the above components have not been fully elucidated, it is presumed that components C and D adjust the curvature of the disc-shaped micelles, and component B contributes to the stability of the disc-shaped micelles, resulting in particularly improved stability of the disc-shaped micelles. Through the mechanism described above, the skin cosmetic composition of the present invention can be made to have excellent transparency and storage stability, even when various components, such as oils and other water-insoluble components, are incorporated not only in small amounts but also in relatively large amounts, despite being a water-based skin cosmetic composition. [Examples]

[0074] The present invention will be described in more detail below based on examples, but the present invention is not limited to these examples. The amounts listed in the table are the amounts of each component (i.e., the amount of active ingredients in each raw material; so-called pure content), and are expressed in "mass%" unless otherwise specified.

[0075] Examples 1-31, Comparative Examples 1-9 Using the components shown in the table, each skin cosmetic composition for the Examples and Comparative Examples was prepared by conventional methods.

[0076] (evaluation) The skin cosmetic compositions obtained in the examples and comparative examples were evaluated as follows. The evaluation results are shown in the table.

[0077] (1) Transparency Immediately after preparation, 50g of each example and comparative example skin cosmetic composition was placed in a screw-top tube and visually observed. Transparency was then evaluated according to the following evaluation criteria. <Transparency Evaluation Criteria> ○ (Good): Clear and free of turbidity. △(Acceptable): Although cloudy, it is transparent and you can see through to the other side of the screw tube. × (Defective): The water is cloudy, and it is not possible to see through to the other side of the screw tube.

[0078] (2) Storage stability 50 g of each example and comparative example skin cosmetic composition was placed in a screw-top tube and stored in a constant temperature chamber at 5°C for 14 days. The appearance of the screw-top tubes of each skin cosmetic composition after storage was visually observed, and the storage stability was evaluated according to the following evaluation criteria. <Evaluation Criteria for Storage Stability> ○ (Good): No separation, precipitates, or sediment are observed. × (Poor): Separation, precipitate, or sediment is observed.

[0079] (3) Confirmation of disc-shaped micelles When the skin cosmetic compositions of Examples 1, 8, 23, 26, and 28 were observed using a transmission electron microscope, disc-shaped micelles were observed.

[0080] [Table 1]

[0081] [Table 2]

[0082] [Table 3]

[0083] The skin cosmetic compositions of the present invention (Examples) were all evaluated as having excellent transparency and storage stability. Furthermore, it was confirmed that disc-shaped micelles were formed in the skin cosmetic compositions of Examples 1, 8, 23, 26, and 28, and it is presumed that disc-shaped micelles were also formed in the other examples. On the other hand, Comparative Examples 1 to 9, which lacked components A, B, or C, which are the main components of disc-shaped micelles, were all evaluated as having poor transparency.

[0084] Furthermore, examples of formulations of the skin cosmetic composition of the present invention are shown. Prescription Example 1: Lotion Hydrogenated lecithin 0.5% by mass Monoglyceryl caprylate 2.0% by mass Polyglyceryl-10 myristate 4.0% by mass γ-oryzanol 0.05% by mass Octyldodecanol 0.5% by mass Potassium lauroyl glutamate 1.5% by mass Purified water remainder Citric acid 0.05% by mass Sodium citrate 0.15% by mass 1,3-BG 8.0% by mass Total 100.0% by mass

[0085] Prescription Example 2: Moisturizing Cream Hydrogenated lecithin 0.5% by mass Monoglyceryl caprylate 1.5% by mass Polyglyceryl-10 myristate 4.0% by mass Sodium myristoyl aspartate 2.0% by mass Octyldodecanol 0.5% by mass Phytosterols 0.05% by mass Purified water remainder Glyceryl monostearate 1.0% by mass Polyglyceryl stearate 1.0% by mass Squalane 5.0% by mass Xanthan gum 0.2% by mass Total 100.0% by mass

Claims

1. A skin cosmetic composition containing the following components A, B, C, D, and E, and including disc-shaped micelles. Component A: Phospholipids Component B: Salt of an acylamino acid having an acylamino acid structure in which one or more acyl group moieties selected from the group consisting of a cocoyl group, a lauroyl group, and a myristoyl group are bonded to an amino acid moiety that is glutamic acid and / or aspartic acid. Component C: Fatty acid polyglyceryl, which is an ester of a fatty acid with 8 to 18 carbon atoms and polyglycerol, with an average degree of polymerization of polyglycerol of 10. Component D: Fatty acid monoglyceryl, which is an ester of a fatty acid with 8 to 12 carbon atoms and glycerol. Ingredient E: Water

2. The skin cosmetic composition according to claim 1, wherein component B is component B1 below, component C is component C1 below, and component D is component D1 below. Component B1: One or more acyl amino acid salts selected from the group consisting of cocoyl glutamate, lauroyl glutamate, myristoyl glutamate, cocoyl aspartate, lauroyl aspartate, myristoyl aspartate, and dilauroyl glutamate lysine salt. Component C1: One or more fatty acid polyglycerides selected from the group consisting of polyglyceryl-10 laurate, polyglyceryl-10 myristate, polyglyceryl-10 palmitate, polyglyceryl-10 stearate, polyglyceryl-10 caprylate, polyglyceryl-10 caprate, and polyglyceryl-10 oleate. Component D1: One or more fatty acid monoglycerides selected from the group consisting of monoglyceryl laurate, monoglyceryl caprylate, and monoglyceryl caprate.

3. The skin cosmetic composition according to claim 1 or 2, wherein the mass ratio of component A to the total amount of component A and component C [A / (A+C)] is 0.04 to 0.

3.

4. The skin cosmetic composition according to claim 1 or 2, wherein the mass ratio of component D to the total amount of component A and component C [D / (A+C)] is 0.15 to 2.

0.

5. The skin cosmetic composition according to claim 1 or 2, wherein the mass ratio of component B to the total amount of component A and component C [B / (A+C)] is 0.3 to 4.

0.

6. Furthermore, the skin cosmetic composition according to claim 1 or 2, further containing the following ingredient F. Ingredient F: Oily component

7. Furthermore, the skin cosmetic composition according to claim 1 or 2, further containing the following component G. Component G: Linear or branched higher alcohols

8. A skin cosmetic comprising the skin cosmetic composition according to claim 1 or 2.

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