Oil-in-water cosmetic

Abstract

An oil-in-water cosmetic containing: (A) a composition for emulsification, which contains a monovalent linear aliphatic alcohol having 12 to 24 carbon atoms, a polyglycerol pentastearate, and sodium stearoyl lactylate; (B) an oil agent; (C) a nonionic surfactant having an HLB value of 5 or more; and (D) an amphiphilic pigment; and the oil-in-water cosmetic further containing at least one ultraviolet ray defensive agent selected from the group consisting of an ultraviolet ray absorber and an ultraviolet ray scattering agent.

Description

Technical Field

[0001] The present invention relates to an oil-in-water cosmetic. More specifically, the present invention relates to an oil-in-water cosmetic having excellent water resistance, usability, washability and storage stability. Background Art

[0002] As a cosmetic material that has good skin-adhesiveness, smooth spreading on the skin, and excellent stability over time, an oil-in-water type cosmetic material containing (a) sodium acrylate / sodium acryloyldimethyl taurate copolymer, (b) gellan gum, (c) electrolyte, and (d) oil has been proposed (see, for example, Patent Document 1). However, when the oil-in-water type cosmetic material is applied to human skin, it has poor water resistance.

[0003] In recent years, there has been a desire to develop an oil-in-water type cosmetic that has excellent properties such as the property that the cosmetic applied to the skin is not easily removed by water or the like (hereinafter referred to as "water resistance"), the property that the cosmetic applied to the skin is well integrated and spreads smoothly on the skin (hereinafter referred to as "usability"), the property that the cosmetic applied to the skin can be easily washed off (hereinafter referred to as "washability"), and the property that the cosmetic is not easily separated even in harsh environments (hereinafter referred to as "storage stability").

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2016-190835 Summary of the invention

[0007] Problems to be solved by the invention

[0008] The present invention has been made in view of the above-mentioned prior art, and an object of the present invention is to provide an oil-in-water cosmetic having excellent water resistance, usability, washability and storage stability.

[0009] Means for solving problems

[0010] The present invention relates to an oil-in-water cosmetic, which comprises: (A) an emulsifying composition containing a monovalent straight-chain aliphatic alcohol having 12 to 24 carbon atoms, polyglycerol pentastearate and sodium stearoyl lactylate; (B) an oil agent; (C) a nonionic surfactant having an HLB value of 5 or more; and (D) an amphiphilic pigment.

[0011] Effects of the Invention

[0012] According to the present invention, there is provided an oil-in-water cosmetic having excellent water resistance, usability, washability and storage stability. DETAILED DESCRIPTION

[0013] As described above, the oil-in-water cosmetic of the present invention contains (A) an emulsifying composition containing a monovalent straight-chain aliphatic alcohol having 12 to 24 carbon atoms, polyglycerol pentastearate and sodium stearoyl lactylate; (B) an oil agent; (C) a nonionic surfactant having an HLB value of 5 or more; and (D) an amphiphilic pigment. The oil-in-water cosmetic of the present invention contains these components and has excellent water resistance, usability, washability and storage stability.

[0014] (A) Emulsification composition

[0015] The emulsifying composition contains a monovalent straight-chain aliphatic alcohol having 12 to 24 carbon atoms, polyglycerol pentastearate and sodium stearoyl lactylate.

[0016] The emulsified composition has the property of improving the fixation of the oil-in-water cosmetic to the skin and improving the water resistance.

[0017] From the perspective of improving the fixation of oil-in-water cosmetics to the skin and improving water resistance, the content of the emulsifying composition in the oil-in-water cosmetic is preferably 1% by mass or more, more preferably 1.5% by mass or more. Similarly, from the perspective of improving the fixation of oil-in-water cosmetics to the skin and improving water resistance, it is preferably 12% by mass or less, more preferably 10% by mass or less.

[0018] [Monovalent straight-chain aliphatic alcohol having 12 to 24 carbon atoms]

[0019] The monovalent straight-chain aliphatic alcohol having 12 to 24 carbon atoms is a component that improves the fixation of oil-in-water type cosmetics to the skin and improves water resistance.

[0020] As monovalent straight-chain aliphatic alcohols having 12 to 24 carbon atoms, for example, cetyl alcohol (carbon number: 16), 1-heptadecanol (carbon number: 17), stearyl alcohol (carbon number: 18), nonadecanol (carbon number: 19), arachidyl alcohol (carbon number: 20), heneicosyl alcohol (carbon number: 21), behenyl alcohol (carbon number: 22), etc. can be cited, but the present invention is not limited to the above examples. These straight-chain aliphatic alcohols can be used alone or in combination of two or more. Among the monovalent straight-chain aliphatic alcohols having 12 to 24 carbon atoms, monovalent straight-chain aliphatic alcohols having 16 to 22 carbon atoms are preferred from the perspective of improving the fixation of oil-in-water cosmetics to the skin and improving water resistance, and at least one selected from the group consisting of cetyl alcohol, stearyl alcohol, arachidyl alcohol and behenyl alcohol is more preferred.

[0021] From the perspective of improving the fixation and water resistance of the oil-in-water cosmetic to the skin, the lower limit of the content of the monovalent linear aliphatic alcohol having 12 to 24 carbon atoms in the emulsified composition is preferably 40% by mass or more, more preferably 45% by mass or more. From the perspective of improving the fixation and water resistance of the oil-in-water cosmetic to the skin, the upper limit of the content of the monovalent linear aliphatic alcohol having 12 to 24 carbon atoms in the emulsified composition is preferably 60% by mass or less, more preferably 55% by mass or less.

[0022] [Polyglyceryl Pentastearate]

[0023] Polyglyceryl pentastearate is a component commonly used as a lipophilic emulsifier. Polyglyceryl pentastearate has an HLB value of 3.5 and is also known as polyglyceryl-10 pentastearate or decaglyceryl pentastearate.

[0024] From the perspective of improving the fixation and water resistance of oil-in-water cosmetics to the skin, the lower limit of the content of polyglycerol pentastearate in the emulsifying composition is preferably 25% by mass or more, more preferably 30% by mass or more. From the perspective of improving the fixation and water resistance of oil-in-water cosmetics to the skin, the upper limit of the content of polyglycerol pentastearate in the emulsifying composition is preferably 50% by mass or less, more preferably 45% by mass or less.

[0025] [Sodium stearoyl lactylate]

[0026] Sodium stearoyl lactylate is an ester of the sodium salt of a dimer of stearic acid and lactic acid. Sodium stearoyl lactylate is commonly used as an anionic surfactant. Sodium stearoyl lactylate is also known as sodium stearoyl lactylate. The molecular weight of sodium stearoyl lactylate is about 450.

[0027] From the perspective of improving the fixation and water resistance of the oil-in-water cosmetic to the skin, the lower limit of the content of sodium stearoyl lactylate in the emulsifying composition is preferably 3% by mass or more, more preferably 5% by mass or more. From the perspective of improving the fixation and water resistance of the oil-in-water cosmetic to the skin, the upper limit of the content of sodium stearoyl lactylate in the emulsifying composition is preferably 25% by mass or less, more preferably 20% by mass or less.

[0028] (B) Oil

[0029] The oil agent can be any one of vegetable oil, animal oil and synthetic oil. These oil agents can be used alone or in combination of two or more. Among the oil agents, vegetable oil and synthetic oil are preferred from the aspect of improving the usability of oil-in-water cosmetics.

[0030] As vegetable oil, for example, olive squalane, coconut oil, eucalyptus oil, olive oil, palm oil, macadamia oil, avocado oil, safflower oil, castor oil, jojoba oil, camellia oil, soybean oil, sunflower oil, etc. can be mentioned, but the present invention is not limited to the above examples. These vegetable oils can be used alone or in combination of two or more.

[0031] As synthetic oil, for example, ester oil, hydrocarbon oil, grease, wax, hydrogenated oil, higher alcohol oil, silicone oil, fluorine oil, etc. can be cited, but the present invention is not limited to the above examples. These synthetic oils can be used alone or in combination of two or more. Among the synthetic oils, ester oil is preferred.

[0032] Examples of the ester oil include triethylhexanoin, cetyl ethylhexanoate, ethyl oleate, isopropyl myristate, octyldodecyl myristate, myristyl myristate, isocetyl myristate, cetyl ethylhexanoate, hexyldecyl ethylhexanoate, isostearyl neopentanoate, isodecyl neopentanoate, octyldodecyl neopentanoate, isopropyl palmitate, cetyl palmitate, ethylhexyl palmitate, isostearyl isostearate, propyl ester, hexyldecyl isostearate, propylene glycol isostearate, isotridecyl isononanoate, isononyl isononanoate, neopentyl glycol didecanoate, neopentyl glycol diethylhexanoate, trimethylolpropane triethylhexanoate, pentaerythritol triethylhexanoate, pentaerythritol tetraethylhexanoate, dipentaerythritol hexahydroxystearate, pentaerythritol tetraoctanoate, pentaerythritol tetraisostearate, diisopropyl adipate, etc., but the present invention is not limited to the above examples. These ester oils can be used alone or in combination of two or more.

[0033] From the aspect of improving the usability of the oil-in-water cosmetic, the lower limit of the content of the oil in the oil-in-water cosmetic is preferably 1% by mass or more, more preferably 5% by mass or more. From the aspect of improving the usability of the oil-in-water cosmetic, the upper limit of the content of the oil in the oil-in-water cosmetic is preferably 50% by mass or less, more preferably 30% by mass or less.

[0034] (C) Nonionic surfactant with an HLB value of 5 or more

[0035] The nonionic surfactant having an HLB value of 5 or more has a property of improving the dispersibility of the amphiphilic pigment contained in the oil-in-water cosmetic.

[0036] In the present invention, the HLB (hydrophilicity-lipophilicity balance) value is based on the Griffin method, by the formula:

[0037] [HLB of nonionic surfactant]=value calculated as 20×[(molecular weight of the hydrophilic part of the nonionic surfactant) / (molecular weight of the nonionic surfactant)].

[0038] From the perspective of improving the usability of oil-in-water cosmetics and the storage stability of oil-in-water cosmetics, the lower limit of the HLB value of the nonionic surfactant is 5 or more, preferably 8 or more, and more preferably 10 or more. From the perspective of improving the usability of oil-in-water cosmetics and the storage stability of oil-in-water cosmetics, the upper limit of the HLB value of the nonionic surfactant is preferably 18 or less, more preferably 17 or less, further preferably 16 or less, and further preferably 15 or less.

[0039] Examples of the nonionic surfactant having an HLB value of 5 or more include polyglyceryl fatty acid esters such as polyglyceryl-10 isostearate (HLB value: 12), polyglyceryl-10 myristate (HLB value: 11), and polyglyceryl-3 diisostearate (HLB value: 5); glyceryl fatty acid esters such as self-emulsifying stearic acid glyceryl (HLB value: 8); polyethylene glycol-3 glyceryl isostearate (HLB value: 6), polyethylene glycol-8 glyceryl isostearate (HLB value: 10), polyethylene glycol-10 glyceryl diisostearate (HLB value: 7), polyethylene glycol-20 glyceryl triisostearate (HLB value: 8), polyethylene glycol (6) monoisostearate (HLB value: 9), and polyethylene glycol (10) monoisostearate. (HLB value: 11), polyethylene glycol (100) monoisostearate (HLB value: 11.6), polyethylene glycol (12) monoisostearate (HLB value: 12), polyethylene glycol (20) monoisostearate (HLB value: 13), polyethylene glycol (20) sorbitan monostearate (HLB value: 15), polyethylene glycol-10 hydrogenated castor oil (HLB value: 7), polyethylene glycol-60 hydrogenated castor oil (HLB value: 14) and other polyethylene glycol fatty acid esters; glycoside compounds such as octyl / decyl glucoside (HLB value: 13.8); sorbitan fatty acid esters such as sorbitan monoisostearate (HLB value: 5), sorbitan sesquiisostearate (HLB value: 4) and the like, but the present invention is not limited to the above examples. These nonionic surfactants may be used alone or in combination of two or more.

[0040] Among the nonionic surfactants having an HLB value of 5 or more, polyglyceryl fatty acid esters, polyethylene glycol fatty acid esters and glucoside compounds are preferred from the perspective of improving the dispersibility of amphiphilic pigments in oil-in-water cosmetics and the storage stability of oil-in-water cosmetics, and polyglyceryl-10 isostearate, polyglyceryl-10 myristate and octyl / decyl glucoside are more preferred.

[0041] From the perspective of improving the dispersibility of the amphiphilic pigment in the oil-in-water cosmetic and the storage stability of the oil-in-water cosmetic, the lower limit of the content of the nonionic surfactant having an HLB value of 5 or more in the oil-in-water cosmetic is preferably 0.05% by mass or more, and more preferably 0.1% by mass or more. From the perspective of improving the dispersibility of the amphiphilic pigment in the oil-in-water cosmetic and the storage stability of the oil-in-water cosmetic, the upper limit of the content of the nonionic surfactant having an HLB value of 5 or more in the oil-in-water cosmetic is preferably 10% by mass or less, more preferably 8% by mass or less, and even more preferably 5% by mass or less.

[0042] (D) Amphiphilic Pigments

[0043] An amphiphilic pigment is a pigment that has been given amphiphilicity. The amphiphilic pigment has two properties, hydrophilicity and hydrophobicity, and is an excipient component used to give color to the skin. As a representative amphiphilic pigment, an amphiphilic pigment containing an amphiphilicity-imparting component can be cited. The pigment containing an amphiphilicity-imparting component can be obtained, for example, by attaching the amphiphilicity-imparting component to the surface of the pigment. The amphiphilic pigment with the amphiphilicity-imparting component attached to the surface has amphiphilicity on the surface of the amphiphilic pigment.

[0044] The pigment used in the amphiphilic pigment can be a pigment that is insoluble in the solvent used in the oil-in-water type cosmetic and is generally used for coloring cosmetics. Examples of the pigment include inorganic pigments, organic pigments, and pigments composed of resin powders (hereinafter referred to as "resin powder pigments"). These pigments can be used alone or in combination of two or more.

[0045] As the above-mentioned inorganic pigment, for example, titanium oxide, iron oxide (red iron oxide, yellow iron oxide, black iron oxide, iron oxide red, etc.), ultramarine, Prussian blue, zinc oxide, aluminum oxide, magnesium oxide, zirconium oxide, cerium oxide, mica, sericite, talc, silicon dioxide, kaolin, chromium hydroxide, carbon black, glass flakes, glass beads, bentonite, chromium oxide, magnesium carbonate, calcium carbonate, calcium silicate, magnesium silicate, aluminum silicate, silicon carbide, barium sulfate, cobalt oxide, cobalt titanate, iron titanate, titanium nitride, manganese violet, Berlin blue and other pigment particles can be mentioned, but the present invention is not limited to the above examples. These inorganic pigments can be used alone or in combination of two or more.

[0046] Examples of the organic pigments include particles of pigments such as lithorube B, lake red C, lithosol red, rhodamine B, Herrington red CN, permanent red, benzyl orange G, and phthalocyanine blue, but the present invention is not limited to the above examples. These organic pigments may be used alone or in combination of two or more.

[0047] As the above-mentioned resin powder pigment, for example, polyamide particles represented by cellulose particles and nylon particles, acrylic resin particles, silicone resin particles, polyurethane particles, fluororesin particles represented by polytetrafluoroethylene particles, etc. can be cited, but the present invention is not limited to the above examples. These resin powder pigments can be used alone or in combination of two or more.

[0048] Among pigments, inorganic pigments are preferred from the perspective of improving the adhesion of the amphiphilicity-imparting component, and particles of titanium oxide, iron oxide, ultramarine, Prussian blue, zinc oxide, aluminum oxide, magnesium oxide, zirconium oxide, cerium oxide, mica, sericite, talc, silica, and kaolin are more preferred.

[0049] The shape of the pigment is not particularly limited. Examples of the shape of the pigment include spherical, ellipsoidal, cylindrical, spindle, and irregular shapes, but the present invention is not limited to these examples.

[0050] The amphiphilicity imparting component is a component for imparting amphiphilicity to the surface of the pigment. As the amphiphilicity imparting component, for example, amino acids, acylated amino acids, glycolipids, etc. can be cited, but the present invention is not limited to the above examples. These amphiphilicity imparting components can be used alone or in combination of two or more. In the present invention, amino acids, acylated amino acids and glycolipids can be used appropriately.

[0051] As the above-mentioned amino acid and the above-mentioned acylated amino acid, for example, lauroyl glutamic acid and its alkali metal salt, stearoyl glutamic acid and its alkali metal salt, palmitoyl proline and its alkali metal salt, palmitoyl sarcosine and its alkali metal salt, palmitoyl glutamic acid and its alkali metal salt, palmitic acid and its alkali metal salt, cocoyl glutamic acid and its alkali metal salt, N-acyl-N-methylglycine, N-acyl-N-methyl-β-alanine, N-acyl-L-glutamate calcium, N-acyl-L-glutamate magnesium, N-acyl-L-glutamate aluminum, N-acyl-L-glutamate zinc, N-acyl-L-glutamate titanium etc. can be enumerated, but the present invention is not limited only to the above-mentioned illustration. These amino acids and acylated amino acids can be used separately, respectively, or two or more can be used in combination. As the above-mentioned alkali metal, sodium and potassium can be enumerated. Among these alkali metals, sodium is preferred.

[0052] Examples of the glycolipids include mannose-erythritol glycolipids which are glycolipids composed of mannose, sugar alcohol, and fatty acids, but the present invention is not limited to these examples.

[0053] Among the above-mentioned amphiphilicity-imparting components, amino acids and alkali metal salts thereof, and acylated amino acids and alkali metal salts thereof are preferred from the viewpoint of improving the dispersibility of the amphiphilic pigment in the oil-in-water cosmetic and the storage stability of the oil-in-water cosmetic. Lauroyl glutamic acid and alkali metal salts thereof, stearoyl glutamic acid and alkali metal salts thereof, palmitoyl glutamic acid and alkali metal salts thereof, cocoyl glutamic acid and alkali metal salts thereof, palmitoyl proline and alkali metal salts thereof, palmitoyl sarcosine and alkali metal salts thereof, and palmitic acid and alkali metal salts thereof are more preferred. Lauroyl glutamic acid and alkali metal salts thereof, stearoyl glutamic acid and alkali metal salts thereof, palmitoyl glutamic acid and alkali metal salts thereof, and cocoyl glutamic acid and alkali metal salts thereof are further preferred.

[0054] From the viewpoint of improving the dispersibility of the amphiphilic pigment in the oil-in-water cosmetic and the storage stability of the oil-in-water cosmetic, the content of the amphiphilicity-imparting component in the amphiphilic pigment is preferably 0.3 to 5% by mass, more preferably 0.5 to 3% by mass.

[0055] Examples of methods for preparing an amphiphilic pigment include a method in which an amphiphilicity-imparting component is added to a suspension in which a pigment is suspended in water, the resulting mixed solution is stirred to allow the amphiphilicity-imparting component to adhere to the surface of the pigment, and the pigment with the amphiphilicity-imparting component adhered to the surface is dried. However, the present invention is not limited to this method.

[0056] Specific examples of the amphiphilic pigment include pigments treated with amino acids (amino acid treated pigments), pigments treated with glycolipids (glycolipid treated pigments), pigments treated with lecithin (lecithin treated pigments), and the like.

[0057] Amphiphilic pigments are easily available commercially. Examples of amphiphilic pigment products include ASL-1 series, SMS series, and LTS series manufactured by Daito Chemical Industry Co., Ltd.; and NAI series, LP series, and CAI series manufactured by Miyoshi Chemicals Co., Ltd. However, the present invention is not limited to the above examples.

[0058] The average particle size of the amphiphilic pigment is not particularly limited. From the perspective of improving the storage stability of the oil-in-water cosmetic, the average particle size of the amphiphilic pigment is preferably 0.1 μm or more, more preferably 0.15 μm or more, and from the perspective of reducing the roughness when the oil-in-water cosmetic is applied to the skin and improving the usability of the oil-in-water cosmetic, it is preferably 400 μm or less, more preferably 350 μm or less, and further preferably 300 μm or less.

[0059] In addition, in the present invention, the average particle size of particles refers to the median particle size calculated from the volume-based particle size distribution measured by a laser scattering method.

[0060] From the perspective of imparting excipient properties to the dry film of the oil-in-water cosmetic, the content of the amphiphilic pigment in the oil-in-water cosmetic is preferably 0.3% by mass or more, more preferably 0.5% by mass or more, and from the perspective of improving the storage stability of the oil-in-water cosmetic and the usability of the oil-in-water cosmetic, it is preferably 55% by mass or less, more preferably 50% by mass or less.

[0061] (E) Water-soluble ingredients

[0062] The water-soluble components commonly used in cosmetics can be used in the oil-in-water cosmetics. As water-soluble components, for example, ethanol, isopropanol, n-butanol, propylene glycol, dipropylene glycol, butylene glycol, polyethylene glycol, glycerol, diglycerol, polyglycerol, glycerol glucoside, phenoxyethanol, xanthan gum, guar gum, carrageenan, mucopolysaccharide, sodium chondroitin sulfate, hyaluronic acid, collagen, elastin, methylcellulose, hydroxyethyl cellulose, carboxymethyl cellulose, carboxyvinyl polymer, polyvinyl alcohol, polyvinyl pyrrolidone, sodium polyacrylate, etc. can be enumerated, but the present invention is not limited to the exemplification. These water-soluble components can be used separately, or two or more can be used in combination.

[0063] From the perspective of showing the effect based on the water-soluble component and improving the usability of the water-in-oil cosmetic, the lower limit of the content of the water-soluble component in the water-in-oil cosmetic is preferably 0.3% by mass or more, more preferably 0.5% by mass or more. From the perspective of showing the effect based on the water-soluble component and improving the usability of the water-in-oil cosmetic, the upper limit of the content of the water-soluble component in the water-in-oil cosmetic is preferably 35% by mass or less, more preferably 20% by mass or less.

[0064] (F) UV protection agent

[0065] From the perspective of avoiding the adverse effects of ultraviolet rays on the skin, it is preferred that an ultraviolet protection agent be contained in an oil-in-water type cosmetic. Examples of ultraviolet protection agents include ultraviolet absorbers and ultraviolet scatterers, but the present invention is not limited to the examples. These ultraviolet protection agents may be used alone or in combination.

[0066] Examples of the ultraviolet absorber include benzophenone ultraviolet absorbers such as 2-hydroxy-4-methoxybenzophenone, 2,4-dihydroxybenzophenone, 2,2'-dihydroxy-4,4'-dimethoxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, 2,2',4,4'-tetrahydroxybenzophenone, and 2-hydroxy-4-n-octyloxybenzophenone; dibenzoylmethane ultraviolet absorbers such as 4-tert-butyl-4'-methoxydibenzoylmethane, 4-isopropyldibenzoylmethane, 4-methoxydibenzoylmethane, and 4-tert-butyl-4'-hydroxydibenzoylmethane; and p-aminobenzoic acid, ethyl p-aminobenzoate, butyl p-aminobenzoate, 2-ethylhexyl p-dimethylaminobenzoate, glyceryl p-aminobenzoate, octyl p-dimethylaminobenzoate, Benzoic acid-based ultraviolet absorbers such as amyl p-aminobenzoate and diethylaminohydroxybenzoyl hexyl benzoate; cinnamic acid-based ultraviolet absorbers such as 2-ethylhexyl p-methoxycinnamate, isopropyl p-methoxycinnamate, diethanolamine p-methoxyhydrocinnamate, di-p-methoxycinnamic acid-mono-2-ethylhexanoic acid glyceryl ester, octyl methoxycinnamate, and methyl diisopropyl cinnamate; triazine-based ultraviolet absorbers such as bis-ethylhexyloxyphenol methoxyphenyl triazine; salicylic acid-based ultraviolet absorbers such as methyl salicylate, 2-ethylhexyl salicylate, phenyl salicylate, amyl salicylate, benzyl salicylate, isopropyl benzyl salicylate, ethylene glycol salicylate, dipropylene glycol salicylate, and triethanolamine salicylate; anthranilic acid-based ultraviolet absorbers such as menthol anthranilate, etc., but the present invention is not limited to the above examples. These ultraviolet absorbers may be used alone or in combination of two or more.

[0067] As the ultraviolet scattering agent, for example, titanium oxide, titanium dioxide, zinc oxide, zirconium oxide, cerium oxide, etc. can be cited, but the present invention is not limited to the above examples. These ultraviolet scattering agents can be used alone or in combination of two or more. The average particle size of the ultraviolet scattering agent is preferably 5nm to 300nm, more preferably 10nm to 80nm.

[0068] The content of the ultraviolet protection agent in the oil-in-water cosmetic varies depending on the type of the ultraviolet protection agent, and therefore cannot be generalized. From the perspective of fully exhibiting the ultraviolet protection property, the content of the ultraviolet protection agent in the oil-in-water cosmetic is preferably 0.1% by mass or more, more preferably 0.3% by mass or more, and even more preferably 0.5% by mass or more, and from the perspective of improving the usability of the oil-in-water cosmetic, it is preferably 30% by mass or less, more preferably 20% by mass or less, and even more preferably 10% by mass or less.

[0069] (G) Additives

[0070] In the oil-in-water cosmetic, as required, additives commonly used in oil-in-water cosmetics may also be included within the scope that does not hinder the purpose of the present invention. Examples of additives include chelating agents such as sodium salt of ethylenediaminetetraacetic acid, antioxidants, vitamins, skin-beautifying ingredients, colorants, thickeners, preservatives, antioxidants, touch improvers, moisturizers, cooling agents, anti-inflammatory agents, fragrances, pH adjusters, film-forming agents, astringents, etc., but the present invention is not limited to the above examples.

[0071] The remainder of each component of the oil-in-water cosmetic is water. The amount of water is adjusted so that each component is contained in the oil-in-water cosmetic at a predetermined content. The amount of water used in the oil-in-water cosmetic is not particularly limited, but is usually preferably 20 to 100 parts by mass per 100 parts by mass of the total amount of (A) the emulsifying composition, (B) the oil, (C) the nonionic surfactant having an HLB value of 5 or more, (D) the amphiphilic pigment, (E) the water-soluble component, (F) the ultraviolet protection agent, and (G) the additive.

[0072] Oil-in-water cosmetics can be prepared, for example, by slowly adding (A) an emulsifying composition, (B) an oil, (C) a nonionic surfactant having an HLB value of 5 or more, and (D) an amphiphilic pigment, and (E) a water-soluble component, (F) an ultraviolet protection agent, (G) an additive, and other components to water under stirring. In addition, oil-in-water cosmetics can also be prepared, for example, by mixing and dispersing (A) an emulsifying composition, (B) an oil, (C) a nonionic surfactant having an HLB value of 5 or more, and (D) an amphiphilic pigment, water, and (E) a water-soluble component, (F) an ultraviolet protection agent, (G) an additive, and other components to form a uniform composition, and then placing the obtained dispersion in a container of a prescribed shape for molding. When preparing the above-mentioned dispersion, in order to disperse the components uniformly, the components can be mixed while being heated.

[0073] The oil-in-water cosmetic may be in any form of cream, gel, or emulsion. The oil-in-water cosmetic may be used, for example, as an oil-in-water emulsion for sunscreen, an oil-in-water foundation for sunscreen, and the like.

[0074] The shape of the water-in-oil type cosmetic varies according to the use of the water-in-oil type cosmetic, and therefore cannot be determined uniformly, and is therefore preferably appropriately determined according to the use. For example, when the water-in-oil type cosmetic is solid, the shape of the water-in-oil type cosmetic may include a rod, a plate, a column, etc., but the present invention is not limited to the above-mentioned examples.

[0075] The oil-in-water cosmetic can be used by filling it in a container such as a resin container or a metal container having an inner surface having a predetermined shape.

[0076] The oil-in-water cosmetic of the present invention obtained as described above is excellent in water resistance, usability, washability, and storage stability of the oil-in-water cosmetic.

[0077] Example

[0078] Next, the oil-in-water cosmetic of the present invention will be described in more detail based on examples, but the present invention is not limited to these examples.

[0079] Examples 1 to 51 and Comparative Examples 1 to 9

[0080] The components shown in the following tables (the unit of the amount of each component described in the table is: mass %) are mixed under stirring in a manner to obtain a uniform composition, thereby preparing a dispersion, and the obtained dispersion is degassed and then filled into a molding mold having an inner surface shape corresponding to a predetermined shape of an oil-in-water foundation, thereby obtaining an oil-in-water foundation.

[0081] The particle size of the amino acid treated pigment used as the amphiphilic pigment in each example was in the range of 0.15 μm to 100 μm, and the amino acid was attached to the surface of the pigment. The amino acid content in the amino acid treated pigment was about 1% by mass.

[0082] The particle size of each glycolipid-treated particle used as the amphiphilic pigment in each example was in the range of 0.15 μm to 100 μm, and glycolipid (mannose) was attached to the surface of the pigment. The content of glycolipid in each glycolipid-treated pigment was about 1% by mass.

[0083] The particle sizes of the silica-treated pigment and the silicone-treated pigment used in each comparative example are all within the range of 0.15 μm to 100 μm, and silica or silicone is attached to the surface of the pigment. The content of silica in the silica-treated pigment is about 1% by mass, and the content of silicone in the silicone-treated pigment is about 1% by mass. In addition, the particle sizes of the mica, titanium oxide, red iron oxide, yellow iron oxide, and black iron oxide used in the comparative examples are all within the range of 0.15 μm to 100 μm.

[0084] It should be noted that the above-mentioned treated pigment refers to a pigment that has been subjected to physical treatment or chemical treatment on the surface of the pigment. As the above-mentioned physical treatment, for example, adhesion, coating, etc. can be given. As the chemical treatment, for example, coupling treatment can be given. Both physical treatment and chemical treatment can also be applied to the surface of the pigment.

[0085] The average particle size of the titanium oxide fine particles used in each example was 15 μm, and the average particle size of the zinc oxide fine particles was 35 μm.

[0086] Next, the water resistance, usability, washability and storage stability of the oil-in-water foundation obtained above were examined by the following methods. The results are shown in the tables.

[0087] [Water resistance]

[0088] 0.1 g of an oil-in-water foundation or 0.1 g of a water-in-oil foundation was applied to a black biological skin plate and dried at room temperature (about 25° C.) for 20 minutes.

[0089] The dried biological skin plate was immersed in water at a temperature of 30° C. for 30 minutes, taken out of the water, and dried at room temperature (about 25° C.) for 20 minutes to obtain a sample A. In addition, the dried biological skin plate was immersed in water at a temperature of 30° C. for 30 minutes, and then immersed for 2 hours while stirring the water with a stirrer, and then taken out of the water and dried at room temperature (about 25° C.) for 20 minutes to obtain a sample B.

[0090] The color difference ΔE between the sample A and the sample B obtained above was measured at room temperature under the measurement conditions of 10° / D65SCE (matte) using a colorimeter [manufactured by Konica Minolta Japan Co., Ltd., product number: CM-26dG]. * ab.

[0091] The color difference ΔE measured above * ab is used as an evaluation index for the property (water resistance) of a cosmetic applied to human skin that is not easily removed by water or the like, and the water resistance of the dried film is evaluated based on the following evaluation criteria. * The smaller the ab value is, the better the water resistance is.

[0092] (Evaluation criteria for water resistance)

[0093] ◎: Color difference ΔE of sample A * Color difference ΔE between ab and sample B * ab are both less than 2.00.

[0094] 0: Color difference ΔE of sample A * ab is less than 2.00, but the color difference ΔE of sample B * ab is 2.00 or more and less than 3.0.

[0095] △: Color difference ΔE of sample A * Color difference ΔE between ab and sample B * Both ab are 2.0 or more and less than 3.0.

[0096] ×: Color difference ΔE of sample A * Color difference ΔE between ab and sample B * ab are both above 3.0.

[0097] [Usability]

[0098] The foundation removed with the fingers of one hand was applied to the cheeks of five female panelists, and the five panelists were asked to investigate the usability at this time. The usability was evaluated based on the following evaluation criteria.

[0099] (Evaluation criteria for usability)

[0100] ◎: Five panelists commented that it blends well with the skin and spreads smoothly on the skin.

[0101] 0: 4 panelists commented that it blends well with the skin and spreads smoothly on the skin.

[0102] △: Three panelists commented that it blends well with the skin and spreads smoothly on the skin.

[0103] ×: Two or less panelists evaluated that the product blended well with the skin and spread smoothly on the skin.

[0104] [Cleaning properties]

[0105] After washing the back of your hand with cleansing foam, apply foundation all over the back of your hand.

[0106] Next, the half area of ​​the back of the hand on the thumb side, centered on the index finger, was gently stroked with foam formed by mixing equal amounts of warm water at about 37°C and an amino acid-based facial cleanser [manufactured by DAIICHI SANKYO HEALTHCARE Co., Ltd., trade name: Minongentle wash whip] to cleanse. It should be noted that the amino acid-based facial cleanser is generally known as a facial cleanser with mild cleaning power, and therefore, in order to evaluate whether even a facial cleanser with mild cleaning power can easily clean cosmetics attached to the skin, the amino acid-based facial cleanser was used.

[0107] Next, the entire back of the hand was washed with running water at about 37°C, and the back of the hand was dried with a hot air dryer. The dried back of the hand was observed with an optical microscope (magnification: 20 times), and the coated surface at this time was photographed.

[0108] The cleansed area and the unwashed area on the back of the hand were compared to examine whether the cosmetic applied to the skin could be easily washed off, and the washing property was evaluated based on the following evaluation criteria.

[0109] (Evaluation criteria for cleaning performance)

[0110] ◎: The foundation adhering to the back of the hand was completely removed.

[0111] ○: The foundation attached to the back of the hand was almost completely removed.

[0112] △: There is a slight amount of foundation left on the back of the hand.

[0113] ×: There is a noticeable amount of foundation left on the back of the hand.

[0114] [Storage stability]

[0115] A sealed container was filled with a powder foundation, placed in a thermostatic chamber at 50°C, and stored for 14 days. The powder foundation was then taken out of the thermostatic chamber, and its surface state was visually observed. Storage stability was evaluated based on the following evaluation criteria.

[0116] (Evaluation criteria for storage stability)

[0117] ◎: Even after storage for 14 days, no separation of the oil layer and the water layer was observed in the foundation.

[0118] ○: After 14 days of storage, a small amount of separation between the oil layer and the water layer was observed in the foundation.

[0119] △: After 14 days of storage, separation of the oil layer and the water layer was slightly observed in the foundation.

[0120] ×: After the foundation was prepared, separation of the oil layer and the water layer was confirmed immediately.

[0121] In addition, the explanation of the components described in each table is as follows.

[0122] [Surfactant]

[0123] Polyglyceryl-10 Isostearate: Polyglyceryl Isostearate with an HLB value of 12

[0124] Polyglyceryl-10 Myristate: Polyglyceryl myristate with an HLB value of 11

[0125] PEG-60 hydrogenated castor oil: Polyethylene glycol-60 hydrogenated castor oil with an HLB value of 14

[0126] Octyl / decyl glucoside: Octyl / decyl glucoside with an HLB value of 13.8

[0127] · Sorbitan monoisostearate: Sorbitan monoisostearate having an HLB value of 5 [manufactured by Nikko Chemical Co., Ltd., trade name: NIKKOL SI-10RV]

[0128] Self-emulsifying stearic acid glyceryl: stearic acid glyceryl with an HLB value of 8 [manufactured by Nikko Chemical Co., Ltd., trade name: NIKKOL MGS-BSEV]

[0129] · Sorbitan sesquiisostearate: Sorbitan sesquiisostearate having an HLB value of 4 [manufactured by Nissin Oillio Group Ltd., trade name: COSMOL 182V]

[0130] [Amphiphilic Pigments]

[0131] Amino acid treated mica particles A: mica particles with lauroyl glutamic acid attached

[0132] Amino acid treated titanium oxide particles B: titanium oxide particles to which lauroyl glutamic acid is attached

[0133] Amino acid treated red iron oxide particles C: red iron oxide particles with lauroyl glutamic acid attached

[0134] Amino acid treated yellow iron oxide particles D: Yellow iron oxide particles with lauroyl glutamic acid attached

[0135] Amino acid treated black iron oxide particles E: Black iron oxide particles with lauroyl glutamic acid attached

[0136] Amino acid treated mica particles F: Stearoyl glutamic acid treated mica particles

[0137] Amino acid treated titanium oxide particles G: stearoyl glutamic acid treated titanium oxide particles

[0138] Amino acid treated red iron oxide particles H: stearoyl glutamic acid treated red iron oxide particles

[0139] Amino acid treated yellow oxidized granules I: stearoyl glutamic acid treated yellow oxidized granules

[0140] Amino acid treated black iron oxide particles J: Stearoyl glutamic acid treated black iron oxide particles

[0141] Amino acid treated mica particles K: palmitoyl glutamic acid treated mica particles

[0142] Amino acid treated titanium oxide particles L: Palmitoyl glutamic acid treated titanium oxide particles

[0143] Amino acid treated red iron oxide particles M: Palmitoyl glutamate treated red iron oxide particles

[0144] Amino acid treated yellow oxidized granules N: Palmitoyl glutamic acid treated yellow oxidized granules

[0145] Amino acid treated black iron oxide particles O: Palmitoyl glutamate treated black iron oxide particles

[0146] Amino acid treated mica particles P: Cocoyl glutamic acid treated mica particles

[0147] Amino acid treated titanium oxide particles Q: Cocoyl glutamic acid treated titanium oxide particles

[0148] Amino acid treated red iron oxide particles R: Cocoyl glutamic acid treated red iron oxide particles

[0149] Amino acid treated yellow oxidized granules S: Cocoyl glutamic acid treated yellow oxidized granules

[0150] Amino acid treated black iron oxide particles T: Cocoyl glutamic acid treated black iron oxide particles

[0151] [Table 1]

[0152]

[0153] [Table 2]

[0154]

[0155] [Table 3]

[0156]

[0157]

[0158] [Table 5]

[0159]

[0160] [Table 6]

[0161]

[0162] [Table 7]

[0163]

[0164] [Table 8]

[0165]

[0166] [Table 9]

[0167]

[0168] [Reference test for water resistance]

[0169] For reference, commercial product A (oil-in-water foundation) and commercial product B (water-in-oil foundation) were used to investigate water resistance in the same manner as above. The evaluation results of water resistance when commercial product A and commercial product B were used and the evaluation results of water resistance when the oil-in-water foundation obtained in Example 1 was used are shown in Table 10.

[0170] [Table 10]

[0171]

[0172] From the results shown in Table 10, it can be seen that the oil-in-water foundation obtained in Example 1 has exceptionally excellent water resistance compared with commercial product A, which is a conventional oil-in-water foundation, and has water resistance that is comparable to that of commercial product B, which is a conventional water-in-oil foundation having excellent water resistance.

[0173] [Reference test of cleaning performance]

[0174] For reference, commercial product A (oil-in-water foundation) and commercial product C (water-in-oil foundation) emphasizing the absence of soap were used to investigate the washability in the same manner as above. As a result, the washability of commercial product A was evaluated as ◎, indicating good water resistance, while the washability of commercial product C was evaluated as ×, indicating poor water resistance. In addition, the washability of the oil-in-water foundation obtained in Example 1 was evaluated as ◎ as shown in Table 1.

[0175] From the results of the water resistance reference test and the washability reference test, it can be seen that the oil-in-water foundation obtained in Example 1 has both excellent water resistance and excellent washability compared with Commercial Products A, B and C.

[0176] As mentioned above, as a representative example of the oil-in-water cosmetic of the present invention, an oil-in-water foundation was investigated, but it is a matter of course that other oil-in-water cosmetics such as oil-in-water emulsions can also exert the same effects as described above.

Claims

1. An oil-in-water cosmetic comprising: (A) an emulsifying composition containing a monovalent straight-chain aliphatic alcohol having 12 to 24 carbon atoms, polyglycerol pentastearate and sodium stearoyl lactylate; (B) an oil; (C) a nonionic surfactant having an HLB value of 5 or more; and (D) an amphiphilic pigment.

2. The oil-in-water cosmetic according to claim 1, further comprising at least one ultraviolet protection agent selected from the group consisting of ultraviolet absorbers and ultraviolet scatterers.

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