Oil-in-water emulsified cosmetic composition

Abstract

To provide an oil-in-water emulsified cosmetic composition in which emulsification stability under high-temperature environments is enhanced.SOLUTION: An oil-in-water emulsified cosmetic composition comprising or consisting of the following components (A) to (E): (A) a neutral amino acid or a peptide thereof, (B) particles whose surface is treated with a nonionic hydrophobic treatment agent, (C) water, (D) oil component, and (E) emulsifier, where the content of the component (A) is more than 0.1 mass%.SELECTED DRAWING: None

Description

[Technical Field]

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

[0002] Oil-in-water emulsion cosmetic compositions are sometimes used not only in skin care cosmetics but also in makeup cosmetics because they have a refreshing feel when used and spread easily upon application.

[0003] For example, Patent Document 1 discloses an oil-in-water emulsion cosmetic that has a fresh, smooth feel when used and excellent covering power. More specifically, the cosmetic of Patent Document 1 is an oil-in-water emulsion cosmetic that contains (A) an aqueous component selected from monohydric alcohols and dihydric alcohols, (B) a polyoxyalkylene-modified silicone, (C) an oil, (D) a powder with a hydrophobic surface, and (E) one or more dispersants selected from (E-1) and (E-2) below: (E-1) a polyglycerol fatty acid ester having three or more glycerin molecules, and (E-2) polyhydroxystearic acid, in which the aqueous component (A) accounts for 1 to 15% by mass of the total cosmetic weight when the aqueous component is a monohydric alcohol alone, 1 to 20% by mass of the total cosmetic weight when the aqueous component is a dihydric alcohol alone, and 1 to 45% by mass of the total cosmetic weight when the aqueous component is a combination of a monohydric alcohol and a dihydric alcohol. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2023 / 032832 Summary of the Invention [Problem to be solved by the invention]

[0005] Glycylglycine, a neutral amino acid peptide, is attracting attention as a drug that is effective in shrinking pores.

[0006] The present inventors investigated the incorporation of glycylglycine into an oil-in-water foundation in order to achieve the effect of shrinking pores. During this investigation, the present inventors discovered that in an oil-in-water emulsion cosmetic composition containing particles, if the content of a neutral amino acid such as glycylglycine or its peptide exceeds a certain amount, the emulsion stability in a high-temperature environment deteriorates.

[0007] The present invention aims to improve the above-mentioned circumstances, and its object is to provide an oil-in-water emulsion cosmetic composition that contains particles and a certain amount or more of a neutral amino acid or a peptide thereof, yet has improved emulsion stability in a high-temperature environment. [Means for solving the problem]

[0008] The present invention that achieves the above object is as follows.

[0009] <Aspect 1> An oil-in-water emulsion cosmetic composition, Contains or consists of the following components (A) to (E): (A) a neutral amino acid or a peptide thereof, (B) Particles surface-treated with a nonionic hydrophobic treatment agent; (C) Water; (D) oil, and (E) an emulsifier, The content of the component (A) is more than 0.1% by mass. composition. <Aspect 2> Aspect 2. The composition of aspect 1, wherein component (A) comprises glycylglycine and / or alanine. <Aspect 3> Aspect 3. The composition of aspect 1 or 2, wherein component (E) is a nonionic emulsifier. <Aspect 4> Aspect 4. The composition according to any one of Aspects 1 to 3, wherein in component (B), the nonionic hydrophobic treatment agent is an ester compound of a fatty acid having 8 to 20 carbon atoms and glycerin. <Aspect 5> Aspect 5. The composition of aspect 4, wherein the ester compound is at least one selected from the group consisting of diglyceryl tetraisostearate, diglyceryl triisostearate, caprylic / capric triglyceride, glyceryl dilaurate, glyceryl triisostearate, decaglyceryl monoisostearate, and decaglyceryl diisostearate. <Aspect 6> Aspect 6. The composition of any one of aspects 1 to 5, wherein in component (B), the particles comprise pigment particles, and the pigment particles comprise at least one selected from the group consisting of titanium oxide, yellow iron oxide, red iron oxide, black iron oxide, zinc oxide, and mica. <Aspect 7> The composition of any one of embodiments 1 to 6, further comprising (F) a dispersant. <Aspect 8> Aspect 8. The composition according to any one of aspects 1 to 7, wherein the content of component (B) is 1.0 to 30% by mass. <Aspect 9> A base makeup cosmetic comprising the composition according to any one of aspects 1 to 8. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide an oil-in-water emulsion cosmetic composition that has improved emulsion stability in a high-temperature environment (for example, an environment of 50°C).

[0011] Furthermore, according to the present invention, it is possible to provide an oil-in-water emulsion cosmetic composition in which the dispersion stability of particles that have been surface-treated with a hydrophobic treatment agent in a high-temperature environment is improved.

[0012] That is, the oil-in-water emulsion cosmetic composition of the present invention can achieve both emulsion stability and dispersion stability in a high-temperature environment. DETAILED DESCRIPTION OF THE INVENTION

[0013] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the preferred embodiments. However, the present invention is not limited to the following embodiments, and various modifications can be made within the scope of the present invention.

[0014] Oil-in-water emulsion cosmetic composition The oil-in-water emulsion cosmetic composition of the present invention (hereinafter also simply referred to as "the composition of the present invention") is An oil-in-water emulsion cosmetic composition, Contains or consists of the following components (A) to (E): (A) a neutral amino acid or a peptide thereof, (B) Particles surface-treated with a nonionic hydrophobic treatment agent; (C) Water; (D) oil, and (E) an emulsifier, The content of the component (A) is more than 0.1% by mass. composition is.

[0015] According to the composition of the present invention, even when a certain amount or more of a neutral amino acid or a peptide thereof is contained as component (A) (for example, even when the content of component (A) is more than 0.1% by mass or 0.5% by mass or more), the particles are surface-treated with a specific hydrophobic treatment agent, and therefore good emulsion stability can be obtained in a high-temperature environment, for example, a high-temperature environment of 50°C.

[0016] Specifically, through extensive research by the present inventors, it was found that in oil-in-water emulsion cosmetic compositions containing particles that have been surface-treated with a hydrophobic treatment agent and maintained in oil droplets (oil phase) (i.e., particles surface-treated with a hydrophobic treatment agent), a high content of neutral amino acids or peptides thereof adversely affects emulsification. Such adverse effects on emulsification were particularly pronounced in high-temperature environments (e.g., 50°C).

[0017] Without being limited to theory, it is believed that such emulsion instability occurs due to the following reasons. Some commonly used hydrophobic treatment agents have a high affinity with neutral amino acids or their peptides. If the affinity between the hydrophobic treatment agent and the neutral amino acid or its peptide is high, and the content of the neutral amino acid or its peptide is equal to or greater than a certain amount, the hydrophobicity effect of the particles due to the surface treatment with the hydrophobic treatment agent is hindered by the neutral amino acid or its peptide, resulting in a decrease in the degree of hydrophobicity of the particles. When the degree of hydrophobicity of the particles decreases, the particles come out of the oil droplets (oil phase). If particles come out of the oil droplets (oil phase), the emulsion becomes unstable, and Particles that fly out of the oil droplets (oil phase) aggregate in the aqueous phase, increasing the viscosity of the oil-in-water emulsion cosmetic composition.

[0018] Therefore, the present inventors conducted further intensive research and selected particles that had been surface-treated with a nonionic hydrophobic treatment agent to prepare the composition of the present invention, and were able to obtain good emulsion stability in a high-temperature environment.

[0019] Furthermore, in the composition of the present invention, since the particles surface-treated with a hydrophobic treatment agent are uniformly dispersed in the oil phase, good dispersibility and stability can be obtained even in a high-temperature environment.

[0020] Each of the components that may be contained in the composition of the present invention will be described in detail below.

[0021] <Component (A)> The composition of the present invention contains a neutral amino acid or a peptide thereof as component (A). In the composition of the present invention, component (A) can be present in the aqueous phase.

[0022] By containing a neutral amino acid or a peptide thereof, the composition of the present invention can have a skin-beautifying effect derived from the neutral amino acid or the peptide thereof. The neutral amino acid contained in the composition of the present invention may be at least one type, and the peptide of a neutral amino acid contained in the composition of the present invention may also be at least one type. Of course, the composition of the present invention may simultaneously contain at least one type of neutral amino acid and at least one type of peptide of a neutral amino acid.

[0023] The neutral amino acids may be natural or synthetic.

[0024] In the present invention, more specifically, the neutral amino acid may be at least one selected from the group consisting of alanine, glycine, proline, valine, leucine, isoleucine, methionine, phenylalanine, tryptophan, cysteine, tyrosine, threonine, serine, asparagine, and glutamine.

[0025] In one embodiment of the present invention, the neutral amino acid according to the present invention may be alanine. In other words, in the composition of the present invention, component (A) may contain alanine. By containing alanine, the composition of the present invention can have, for example, a moisturizing effect.

[0026] In the present invention, a peptide of neutral amino acids refers to one formed by bonding two or more neutral amino acids, and these two or more neutral amino acids may be the same or different neutral amino acids.

[0027] In the present invention, the peptide of neutral amino acids may be, more specifically, for example, glycylglycine, but is not limited thereto.

[0028] In one embodiment of the present invention, the neutral amino acid peptide of the present invention may be glycylglycine. In other words, in the composition of the present invention, component (A) may contain glycylglycine. By containing glycylglycine, the composition of the present invention can have effects such as pore contraction and moisturizing effects.

[0029] In the composition of the present invention, the content of component (A) is greater than 0.1% by mass relative to the total mass of the composition. More specifically, the content of component (A) may be 0.2% by mass or more, 0.3% by mass or more, 0.4% by mass or more, 0.5% by mass or more, 0.6% by mass or more, 0.7% by mass or more, 0.8% by mass or more, 0.9% by mass or more, 1.0% by mass or more, 1.1% by mass or more, 1.2% by mass or more, 1.3% by mass or more, 1.4% by mass or more, or 1.5% by mass or more, and may be 3.0% by mass or less, 2.5% by mass or less, 2.0% by mass or less, 1.8% by mass or less, or 1.6% by mass or less. In the composition of the present invention, the higher the content of component (A), the more pronounced the effects of the present invention can be and the greater the skin-beautifying effect derived from component (A) can be.

[0030] <Component (B)> The composition of the present invention contains, as component (B), at least one type of particle whose surface has been treated with a nonionic hydrophobic treatment agent. In the composition of the present invention, component (B) can be present in the oil phase.

[0031] In the present invention, the nonionic hydrophobic treatment agent refers to a hydrophobic treatment agent that does not become ionic in water. Examples of the nonionic hydrophobic treatment agent include, but are not limited to, ester surface treatment agents and silicone surface treatment agents.

[0032] Among nonionic hydrophobic treatment agents, ester surface treatment agents are preferred, for example, from the viewpoint of suppressing the syneresis of emulsions. Note that "syneresis" refers to the phenomenon in which water retained between polymers separates, and therefore, in the present invention, the syneresis of emulsions refers to the phenomenon in which water separates from an oil-in-water emulsion cosmetic composition (for example, from a polymer thickener when one is blended with the composition).

[0033] In the present invention, the ester surface treatment agent is not particularly limited and may include, for example, an ester compound of a fatty acid having 8 to 20 carbon atoms and glycerin, and / or an ester compound of a fatty acid having 8 to 20 carbon atoms and isostearyl alcohol, and preferably includes an ester compound of a fatty acid having 8 to 20 carbon atoms and glycerin. In particular, from the viewpoint of improving the syneresis properties of the emulsion, the ester surface treatment agent according to the present invention preferably includes an ester compound of a fatty acid having 8 to 20 carbon atoms and glycerin.

[0034] Here, the fatty acid having 8 to 20 carbon atoms for the ester surface treatment agent may specifically be, for example, a fatty acid having 8 or more, 10 or more, 12 or more, 14 or more, 16 or more, or 18 or more carbon atoms, or a fatty acid having 20 or less, 19 or less, or 18 or less carbon atoms. Of these, fatty acids having 8 to 18 carbon atoms are preferred, and fatty acids having 12 to 18 carbon atoms are more preferred. Furthermore, such fatty acids may be branched or linear.

[0035] Furthermore, the glycerin used in the ester surface treatment agent may be either unpolymerized (i.e., a monomer) monoglycerin or polymerized (i.e., a polymer) polyglycerin. When polyglycerin is used, its degree of polymerization is not particularly limited, but is preferably from 2 to 10. As the glycerin, monoglycerin, which is a monomer, diglycerin, which has a degree of polymerization of 2, or decaglycerin, which has a degree of polymerization of 10, is preferred.

[0036] The ester surface treatment agent according to the present invention may contain, for example, at least one selected from the group consisting of diglyceryl tetraisostearate, diglyceryl triisostearate, diglyceryl diisostearate, diglyceryl monoisostearate, caprylic / capric triglyceride, glyceryl triethylhexanoate, glyceryl dilaurate, glyceryl triisostearate, decaglyceryl monoisostearate, and decaglyceryl diisostearate. Among these, for example, from the viewpoint of improving the lipophilicity of the surface-treated particles and from the viewpoint of being a naturally-derived material, preferred ester surface treatment agents are, for example, diglyceryl tetraisostearate, diglyceryl triisostearate, glyceryl dilaurate, glyceryl triisostearate, decaglyceryl monoisostearate, and decaglyceryl diisostearate.

[0037] Specific examples of ester compounds of fatty acids having 8 to 20 carbon atoms and isostearyl alcohol include, but are not limited to, isostearyl sebacate.

[0038] In the present invention, the silicone surface treatment agent is not particularly limited, and examples thereof include triethoxycaprylylsilane, methylhydrogenpolysiloxane, dimethylpolysiloxane, methylphenylpolysiloxane, cyclic dimethylpolysiloxane, and alkyl-modified dimethylpolysiloxane.

[0039] In addition, as long as the effects of the present invention are not impaired, the particles surface-treated with a nonionic hydrophobic treatment agent may include particles that have been composite-treated with a nonionic hydrophobic treatment agent. For example, in one embodiment of the present invention, the particles surface-treated with a nonionic hydrophobic treatment agent may be particles composite-treated with a surface treatment agent containing disodium N-stearoyl glutamate and isostearyl sebacate.

[0040] In the present invention, the particles of component (B) are not particularly limited and may include, for example, pigment particles and / or ultraviolet scattering agent particles. The shape of these particles is also not particularly limited and may be, for example, spherical, rod-like, needle-like, plate-like, irregular, scaly, spindle-like, or the like. The particle size of these particles is also not particularly limited. For example, the primary particle size after surface treatment may be 5 nm or more, 10 nm or more, 100 nm or more, or 500 nm or more, or 2 μm or less, 1 μm or less, or 500 nm or less. In the present invention, the primary particle size of the particles can be determined by observation with a scanning electron microscope (SEM).

[0041] In the present invention, the pigment particles may include, for example, at least one selected from the group consisting of titanium oxide, yellow iron oxide, red iron oxide, black iron oxide, zinc oxide, and mica.

[0042] The ultraviolet scattering agent particles may include, for example, at least one selected from the group consisting of titanium oxide, zinc oxide, iron oxide, and cerium oxide.

[0043] In the present invention, the particles surface-treated with a nonionic hydrophobic treatment agent may be commercially available particles, or may be surface-treated by a known method before use.

[0044] In the present invention, the content of component (B) is not particularly limited, and may be, for example, 1.0 mass% or more, 2.0 mass% or more, 3.0 mass% or more, 4.0 mass% or more, 5.0 mass% or more, 6.0 mass% or more, 7.0 mass% or more, 8.0 mass% or more, 9.0 mass% or more, or 10 mass% or more, relative to the entire composition, and may be 30 mass% or less, 25 mass% or less, 20 mass% or less, 15 mass% or less, 10 mass% or less, or 5.0 mass% or less.

[0045] <Component (C)> The compositions of the present invention comprise water as component (C), which constitutes the external phase (i.e., the aqueous phase) of the compositions of the present invention.

[0046] The water is not particularly limited and may be, for example, water used in cosmetics and quasi-drugs, such as ion-exchanged water, distilled water, ultrapure water, and tap water.

[0047] In the composition of the present invention, the content of component (C) is not particularly limited and may be, for example, 30% by mass or more, 35% by mass or more, or 40% by mass or more, and 95% by mass or less, 90% by mass or less, 80% by mass or less, or 70% by mass or less, based on the total mass of the composition. The content of water may be adjusted as appropriate depending on the intended use of the cosmetic composition.

[0048] <Component (D)> The compositions of the present invention comprise, as component (D), at least one oil, which constitutes the internal phase (i.e., the oil phase) of the compositions of the present invention.

[0049] In the composition of the present invention, the oil is not particularly limited and may be a liquid, solid, or semi-solid oil or a mixture thereof at room temperature (25°C) and atmospheric pressure (1 atm). In addition, the oil may be a non-volatile oil, a volatile oil, or a mixture thereof.

[0050] In the present invention, non-volatile oil refers to oil having a boiling point of over 260°C at room temperature and normal pressure, whereas volatile oil refers to oil having a boiling point of 60 to 260°C at room temperature and normal pressure.

[0051] In the present invention, specific examples of oil components are not particularly limited, and include hydrocarbon oils, ester oils, vegetable oils, higher alcohols, higher fatty acids, oil-based ultraviolet absorbers, and silicone oils.

[0052] Non-volatile hydrocarbon oils include, but are not limited to, liquid paraffin, paraffin, hydrogenated polydecene, hydrogenated polyisobutene, squalane, squalene, petrolatum, etc. Furthermore, volatile hydrocarbon oils can be relatively low molecular weight hydrocarbon oils (boiling points of 250°C or less), and specific examples include, but are not limited to, light liquid isoparaffin (also called "hydrogenated polyisobutene"), isododecane, isohexadecane, (C9-12) alkanes, etc.

[0053] Ester oils include isodecyl neopentanoate, trimethylolpropane triethylhexanoate, triethylhexanoin, pentaerythrityl tetraethylhexanoate, caprylic / capric triglyceride, cetyl ethylhexanoate, isopropyl myristate, cetyl octanoate, octyldodecyl myristate, isopropyl palmitate, butyl stearate, hexyl laurate, myristyl myristate, decyl oleate, hexyldecyl dimethyloctanoate, cetyl lactate, myristyl lactate, lanolin acetate, isocetyl stearate, isocetyl isostearate, cholesteryl 12-hydroxystearate, ethylene glycol di-2-ethylhexanoate, dipentaerythritol fatty acid esters, N-alkyl glycol monoisostearate, neopentyl glycol dicaprate, diisostearyl malate, glycerin di-2-heptylundecanoate, tri-2-ethylhexanoate, glycerin di-2-heptylundecanoate, glycerin di-2-ethylhex ... Trimethylolpropane xanthate, trimethylolpropane triisostearate, glycerin trioctanoate, glycerin triisopalmitate, cetyl 2-ethylhexanoate, pentaerythritol tetra-2-ethylhexanoate, glycerin tri-2-ethylhexanoate, 2-ethylhexyl palmitate, glycerin trimyristate, tri-2-heptylundecanoic acid glyceride, castor oil fatty acid methyl ester, oleyl oleate, acetonitrile Examples of the glyceride include, but are not limited to, glycerides, 2-heptylundecyl palmitate, diisobutyl adipate, N-lauroyl-L-glutamic acid-2-octyldodecyl ester, di-2-heptylundecyl adipate, ethyl laurate, di-2-ethylhexyl sebacate, 2-hexyldecyl myristate, 2-hexyldecyl palmitate, di-2-hexyldecyl adipate, diisopropyl sebacate, and triethyl citrate.

[0054] Examples of vegetable oils include, but are not limited to, avocado oil, camellia oil, macadamia nut oil, corn oil, olive oil, rapeseed oil, sesame oil, castor oil, peanut oil, almond oil, soybean oil, tea seed oil, jojoba oil, and germ oil.

[0055] Examples of higher alcohols include oleyl alcohol, isostearyl alcohol, octyldodecanol, decyltetradecanol, jojoba alcohol, cetyl alcohol, myristyl alcohol, etc. Examples of higher fatty acids include, but are not limited to, oleic acid, isostearic acid, linoleic acid, linolenic acid, eicosapentaenoic acid, docosahexaenoic acid, palmitic acid, stearic acid, etc.

[0056] The oil-based UV absorber is not particularly limited as long as it is one that is commonly used in cosmetics. For example, UV absorbers selected from octocrylene, ethylhexyl methoxycinnamate, ethylhexyl salicylate, 4-tert-butyl-4'-methoxydibenzoylmethane, methylenebisbenzotriazolyltetramethylbutylphenol, bisethylhexyloxyphenol methoxyphenyl triazine, diethylaminohydroxybenzoylhexyl benzoate, ethylhexyl triazone, diethylhexylbutamidotriazone, 2-hydroxy-4-methoxybenzophenone, benzalmalonate, benzotriazole, etc. can be used in appropriate combination.

[0057] The silicone oil may be selected from volatile and non-volatile linear, branched, or cyclic silicone oils. More specifically, examples of the silicone oil include, but are not limited to, methylpolysiloxane, methylphenylpolysiloxane, methylpolycyclosiloxane, methylhydrogenpolysiloxane, dimethylsiloxane, dimethylsiloxane-methylsiloxane copolymer, highly polymerized methylpolysiloxane, tetradecamethylhexasiloxane, octamethyltrisiloxane, dimethylsiloxane-methylcetyloxysiloxane copolymer, decamethyltetrasiloxane, cyclopentasiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, hexadecamethylcycloheptasiloxane, diphenylsiloxyphenyl trimethicone, and trimethylpentaphenyltrisiloxane.

[0058] In the composition of the present invention, the content of component (D) is not particularly limited and may be, for example, 5.0 mass% or more, 7.0 mass% or more, 10 mass% or more, 11 mass% or more, 12 mass% or more, 13 mass% or more, 14 mass% or more, or 15 mass% or more, and may be 50 mass% or less, 45 mass% or less, 40 mass% or less, 35 mass% or less, 30 mass% or less, 25 mass% or less, 20 mass% or less, or 18 mass% or less, relative to the entire composition.

[0059] <Component (E)> The composition of the present invention contains at least one emulsifier as component (E), which is capable of emulsifying oil phase components in the aqueous phase.

[0060] In the present invention, the emulsifier is not particularly limited, but from the viewpoint of further improving the effects of the present invention, it is preferable that the emulsifier is a nonionic emulsifier.

[0061] Here, the nonionic emulsifier is not particularly limited and may be, for example, one having an HLB value of 6 or more and 18 or less. The HLB (Hydrophilic-Lipophilic Balance) value is an index showing the hydrophilic-lipophilic balance of a nonionic emulsifier, and is defined, for example, in the Kawakami method, as HLB value = 7 + 11.7 log (sum of formula weights of hydrophilic moieties / sum of formula weights of lipophilic moieties).

[0062] In the present invention, the nonionic emulsifier may include, for example, polyoxyethylene hydrogenated castor oil.

[0063] Specific examples of polyoxyethylene hydrogenated castor oils include, but are not limited to, PEG-10 hydrogenated castor oil, PEG-20 hydrogenated castor oil, PEG-25 hydrogenated castor oil, PEG-30 hydrogenated castor oil, PEG-40 hydrogenated castor oil, PEG-50 hydrogenated castor oil, PEG-60 hydrogenated castor oil, PEG-80 hydrogenated castor oil, and PEG-100 hydrogenated castor oil.

[0064] In the composition of the present invention, the content of component (E) is not particularly limited and may be, for example, 0.5 mass% or more, 1.0 mass% or more, 1.5 mass% or more, 2.0 mass% or more, or 2.2 mass% or more, relative to the entire composition, and may be 10 mass% or less, 8.0 mass% or less, 5.0 mass% or less, 4.5 mass% or less, 4.0 mass% or less, 3.5 mass% or less, 3.0 mass% or less, or 2.5 mass% or less.

[0065] <Other ingredients> The composition of the present invention may further contain other components in addition to the components described above. The other components will be described below by way of example, but the present invention is not limited to these examples.

[0066] (dispersant) The composition of the present invention may further contain a dispersant. The dispersant may have the role of dispersing particles, powder components, etc. In addition, the dispersant may also function as the emulsifier described above.

[0067] In one embodiment of the present invention, the composition of the present invention further comprises, as component (F), at least one dispersant.

[0068] In the present invention, the dispersant is not particularly limited, and is preferably, for example, a nonionic dispersant. Specifically, the dispersant may include, but is not limited to, at least one selected from the group consisting of isostearic acid, polyglyceryl-6 polyricinoleate, sorbitan sesquiisostearate, bisbutyldimethicone polyglyceryl-3, polyhydroxystearic acid, and cetyl PEG / PPG-10 / 1 dimethicone.

[0069] When a dispersant is contained in the composition of the present invention, the content thereof is not particularly limited and may be, for example, 0.5% by mass or more, 1.0% by mass or more, 1.5% by mass or more, 2.0% by mass or more, or 2.2% by mass or more, and may be 10% by mass or less, 8.0% by mass or less, 5.0% by mass or less, 4.5% by mass or less, 4.0% by mass or less, 3.5% by mass or less, 3.0% by mass or less, or 2.5% by mass or less, relative to the entire composition.

[0070] (acrylic acid-based thickener) The compositions of the present invention may further comprise an acrylic thickener.

[0071] In the present invention, the acrylic acid-based thickener is not particularly limited and may include, for example, at least one selected from acrylamide / sodium acryloyldimethyltaurate copolymer, ammonium acryloyldimethyltaurate / beheneth-25 methacrylate crosspolymer, and acrylates / C10-30 alkyl acrylate crosspolymer.

[0072] When the composition of the present invention contains an acrylic acid-based thickener, its content is not particularly limited and may be, for example, 0.05% by mass or more, 0.1% by mass or more, 0.2% by mass or more, 0.3% by mass or more, 0.4% by mass or more, 0.5% by mass or more, or 0.6% by mass or more, and may be 5.0% by mass or less, 3.0% by mass or less, or 1.0% by mass or less, relative to the total mass of the composition.

[0073] (Other optional ingredients) The composition of the present invention may contain, for example, other surfactants, other aqueous components, moisturizers, antioxidants, alcohols, cosmetic ingredients other than component (A), lecithin, glycolipids, plant extracts, preservatives, fragrances, pH adjusters, other powdered components, pigments, etc., within the scope of not impairing the effects of the present invention.

[0074] Cosmetics The composition of the present invention can be used as a cosmetic or a cosmetic ingredient. Accordingly, the present invention can also provide a base makeup cosmetic containing the composition of the present invention.

[0075] As described above, the composition of the present invention contains (A) a neutral amino acid or a peptide thereof, and therefore the base makeup cosmetic of the present invention can be used to apply makeup while having a skin-beautifying effect.

[0076] Examples of base makeup cosmetics include, but are not limited to, foundation, makeup base, concealer, highlighter, and blush.

[0077] Furthermore, the dosage form of the composition of the present invention is not particularly limited, and examples thereof include, but are not limited to, solid, semi-solid, solid paste, stick, emulsion, liquid, gel, sherbet, cream, ointment, and paste. [Example]

[0078] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these. Unless otherwise specified, the blending amounts in the tables are expressed in mass %.

[0079] Comparative Examples 1 to 5 and Reference Examples 1 to 2 Oil-in-water emulsion cosmetic compositions of Comparative Examples 1 to 5 and Reference Examples 1 and 2 were prepared based on the formulations in Tables 1-1 and 1-2 below. For each of the resulting compositions, the initial viscosity at room temperature (25°C), the viscosity after storage at room temperature (25°C) for one week, and the viscosity after storage at 50°C for one week were measured as follows. In addition, the emulsion stability, dispersion stability, and syneresis after storage at 50°C for one week were evaluated.

[0080] (Initial viscosity at room temperature (25°C)) The viscosity (initial viscosity) of each composition immediately after preparation was measured at room temperature (25°C), rotor number M3 or M4, 30°C, and 12 rpm / min using a Brookfield viscometer (TVB-15 TVB viscometer, manufactured by Toki Sangyo Co., Ltd.). The measurement results are shown in Table 1-3.

[0081] (Viscosity after storage at 50°C for 1 week) After storage at 50°C for one week, each composition was measured in the same manner using the above-mentioned equipment and conditions. The measurement results are shown in Table 1-3.

[0082] (Emulsion stability evaluation at 50°C) The emulsion stability of each composition at 50°C was evaluated according to the following criteria, and the results are shown in Tables 1-3. "Good": The viscosity of the composition sample was little different from that of the product stored at room temperature or was almost the same as that of the product stored at room temperature; "Poor": The viscosity of the composition sample was significantly different from that of the sample stored at room temperature, and a significant increase in viscosity was observed from the state of the sample.

[0083] The reason why the emulsion stability evaluation at 50°C resulted in a "poor" result is thought to be that many particles that had been surface-treated with a hydrophobic treatment agent escaped from the emulsion particles, and these particles aggregated, causing an increase in viscosity (i.e., thickening).

[0084] (Evaluation of dispersion stability at 50°C) The dispersion stability of each composition (dispersion stability of particles surface-treated with a hydrophobic treatment agent) at 50° C. was evaluated according to the following criteria. The results are shown in Tables 1-3. "Good": The composition sample was easily absorbed into water; "Poor": The composition sample was not miscible with water and aggregation was observed.

[0085] (Evaluation of syneresis at 50°C) The syneresis property of each composition at 50°C was evaluated visually and using a ruler according to the following criteria. The results are shown in Tables 1-3. "A": No abscission was observed from the composition sample; "B": A transparent supernatant of 1.5 mm or less was observed on the upper surface of the composition sample.

[0086] This supernatant was the water separated from the composition, but it can be returned to a state suitable for use as a cosmetic by, for example, shaking.

[0087] Furthermore, although the phenomenon of water separation from the composition is not at a level that would cause the emulsion to become unstable as described above, it is presumed that, for example, hydrophobic treated particles that escape from a very small amount of emulsified particles have some effect on the polymer structure that constitutes the composition.

[0088] [Table 1-1]

[0089] [Table 1-2]

[0090] [Table 1-3]

[0091] As is clear from the results in Table 1-3, it was found that all of the compositions of Comparative Examples 1 to 5 had poor emulsion stability and dispersion stability at 50°C.

[0092] On the other hand, the compositions of Reference Examples 1 and 2 had good emulsion stability, which is thought to be due to the low content of glycylglycine as component (A).

[0093] Examples 1 to 5 Oil-in-water emulsion cosmetic compositions of Examples 1 to 5 were prepared based on the formulations in Tables 2-1 and 2-2 below. For each of the resulting compositions, the initial viscosity at room temperature (25°C), the viscosity after one week of storage at room temperature (25°C), and the viscosity after one week of storage at 50°C were measured in the same manner as above. Furthermore, the emulsion stability, dispersion stability, and syneresis after one week of storage at 50°C were evaluated. The results are shown in Table 2-3.

[0094] [Table 2-1]

[0095] [Table 2-2]

[0096] [Table 2-3]

[0097] As is clear from the results in Table 2-3, the compositions of Examples 1 to 5 all had good emulsion stability and dispersion stability at 50°C, i.e., the emulsion stability at 50°C was improved compared to the compositions of Comparative Examples 1 to 5.

[0098] In addition, in the evaluation of syneresis at 50°C, Examples 1 and 4 obtained the best results.

Claims

1. An oil-in-water emulsion cosmetic composition, It contains or consists of the following components (A) to (E): (A) a neutral amino acid or a peptide thereof; (B) particles surface-treated with a nonionic hydrophobic treatment agent; (C) water; (D) oil, and (E) an emulsifier, The content of the component (A) is more than 0.1% by mass. composition.

2. The composition of claim 1 , wherein component (A) comprises glycylglycine and / or alanine.

3. The composition of claim 1 wherein component (E) is a nonionic emulsifier.

4. 2. The composition according to claim 1, wherein in said component (B), said nonionic hydrophobic treatment agent is an ester compound of a fatty acid having 8 to 20 carbon atoms and glycerin.

5. 5. The composition of claim 4, wherein the ester compound is at least one selected from the group consisting of diglyceryl tetraisostearate, diglyceryl triisostearate, caprylic / capric triglyceride, glyceryl dilaurate, glyceryl triisostearate, decaglyceryl monoisostearate, and decaglyceryl diisostearate.

6. 2. The composition of claim 1, wherein in component (B), the particles comprise pigment particles, and the pigment particles comprise at least one selected from the group consisting of titanium oxide, yellow iron oxide, red iron oxide, black iron oxide, zinc oxide, and mica.

7. The composition of claim 1 further comprising (F) a dispersant.

8. The composition according to claim 1, wherein the content of the component (B) is 1.0 to 30 mass%.

9. A base makeup cosmetic comprising the composition according to any one of claims 1 to 8.

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