Oil-in-water emulsion cosmetic composition

Abstract

An oil-in-water emulsion cosmetic composition having an aqueous phase and an oil phase dispersed in the aqueous phase, comprising: (a) a hydrophobized metal oxide, (b) a nonionic surfactant with an HLB value of greater than 12, (c) an oil-soluble dispersant, (d) a water-soluble dispersant comprising an amino acid-based anionic surfactant, (e) an oil-soluble UV filter which is in solid form at 25°C and has a triazine or triazole skeleton, and (f) an ester oil comprising at least one selected from the group consisting of an ester of caprylic acid and / or capric acid, a dialkyl carbonate where at least one of the alkyl groups has 8 or fewer carbon atoms and dialkyl succinates where at least one of the alkyl groups has 8 or fewer carbon atoms.

Description

OIL-IN-WATER EMULSION COSMETIC COMPOSITION

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

[0002] Foundations are cosmetics used to conceal blemishes or fine wrinkles and to improve the aesthetic quality of skin, and because of their major effect on the final appearance of makeup, their level of performance has become a major issue of focus for consumers.

[0003] Foundations include cake type, powder type, cream type and liquid type foundations, among which liquid type foundations are largely classified as either having water-in-oil emulsions as bases or having oil-in-water emulsions as bases (see Japanese Unexamined Patent Publication No. 2008-44901, for example).

[0004] Most foundation bases use water-in-oil emulsions (water-in-oil type foundations). This is due to their high lasting effects and coverage effects for makeup. The pigments in a water-in-oil type foundation are usually present in a continuous oil phase, and consequently when applied onto skin, the pigments and other components are immediately adhered to the skin, exhibiting a rapid makeup effect.

[0005] In recent years, consumers have come to prefer foundations that provide not only makeup effects but also skin care effects such as an ultraviolet protection effect, and therefore efforts are being made not only to improve water-in-oil type foundations, but also to develop foundations using oil-in-water emulsions as bases (oil-in-water foundations). For example, oil-in-water cosmetics containing ethylhexyl methoxycinnamate as an ultraviolet absorber have been studied for providing an ultraviolet protection effect (Japanese Unexamined Patent Publication No. 2020-164466).

[0006] Oil-in-water foundations, however, which have an aqueous phase as the continuous phase, are highly hydrophilic while having low water resistance and low affinity for the skin, and therefore their makeup ingredients readily drop off from the skin, making it impossible to achieve a lasting effect.

[0007] It is an object of the invention to provide an oil-in-water emulsion cosmetic composition having the following features 1) to 3). 1) A high coverage effect 2) A comfortable texture 3) Robust stability

[0008] The present invention provides the following [1]. [1] An oil-in-water emulsion cosmetic composition having an aqueous phase and an oil phase dispersed in the aqueous phase, comprising: (a) a hydrophobized metal oxide, (b) a nonionic surfactant with an HLB value of greater than 12, (c) an oil-soluble dispersant, (d) a water-soluble dispersant comprising an amino acid-based anionic surfactant, (e) an oil-soluble UV filter which is in solid form at 25°C and has a triazine or triazole skeleton, and (f) an ester oil comprising at least one selected from the group consisting of an ester of caprylic acid and / or capric acid, a dialkyl carbonate where at least one of the alkyl groups has 8 or fewer carbon atoms and a dialkyl succinate where at least one of the alkyl groups has 8 or fewer carbon atoms. Hereunder, (a) will be referred to as "component (a)", and likewise for the other components.

[0009] The oil-in-water emulsion cosmetic composition exhibits 1) a high coverage effect and 2) a comfortable texture. In addition, the composition itself has excellent 3) robust stability.

[0010] As ethylhexyl methoxycinnamate has been reported to have effects on the environment, it may become important to devise compositions with no or low usage of ethylhexyl methoxycinnamate, and the present oil-in-water emulsion cosmetic composition exhibits a high coverage effect and texture, as well as an adequate ultraviolet protection effect, without using ethylhexyl methoxycinnamate.

[0011] It is believed that these effects are not derived from each of the individual components (a) to (f) but rather are based on the combination of components (a) to (f). With oil-in-water emulsion cosmetic compositions lacking component (a) it has been difficult to achieve the features of 1) a high coverage effect, 2) a comfortable texture and 3) robust stability.

[0012] With cosmetic compositions lacking any one of component (b), component (c) and component (d) as well, it has been difficult to achieve the features of 1) a high coverage effect, 2) a comfortable texture and 3) robust stability. When component (f) is lacking it has been difficult to achieve the feature of 3) robust stability.

[0013] The present invention also provides the following [2] to [9].

[0014] [2] The cosmetic composition according to [1], wherein component (a) comprises a hydrophobized titanium dioxide and a hydrophobized iron oxide.

[0015] [3] The cosmetic composition according to [1] or [2], wherein component (a) is a metal oxide hydrophobized by at least one selected from the group consisting of sodium dilauramidoglutamide lysine, dextrin isostearate, sodium lauroyl aspartate, isopropyl titanium triisostearate, disodium stearoyl glutamate, sodium myristoyl glutamate and a glycolipid.

[0016] [4] The cosmetic composition according to any one of [1] to [3], wherein component (c) comprises a hydroxy fatty acid ester of polyglycerin.

[0017] [5] The cosmetic composition according to any one of [1] to [4], further comprising (g) a water-soluble thickener.

[0018] [6] The cosmetic composition according to any one of [1] to [5], further comprising (h) an oil UV filter which is in liquid form at 25°C.

[0019] [7] The cosmetic composition according to any one of [1] to [6], wherein the cosmetic composition comprises 1.0 to 40 mass% of component (a), 0.5 to 10 mass% of component (b), 0.01 to 5 mass% of component (c), 0.01 to 2.0 mass% of component (d), 1.0 to 10 mass% of component (e) and 1.0 to 40 mass% of component (f), based on the total amount of the composition.

[0020] [8] The cosmetic composition according to any one of [1] to [7], wherein the cosmetic composition is in the form of a foundation.

[0021] [9] A cosmetic process for caring for and / or making-up keratinic materials, wherein the cosmetic process comprises the application onto keratinic materials, in particular onto skin, of the oil-in-water emulsion cosmetic composition according to any one of [1] to [8].

[0022]

[0010] The cosmetic process according to [9], wherein the oil-in-water emulsion cosmetic composition provides the keratinic materials on which it is applied with a high coverage effect, comfortable texture and robust stability.

[0023] According to the invention there is provided an oil-in-water emulsion cosmetic composition exhibiting the features of 1) a high coverage effect, 2) a comfortable texture and 3) robust stability, without the makeup ingredients easily coming off from the skin.

[0024] The oil-in-water emulsion cosmetic composition of the embodiment comprises component (a): a hydrophobized metal oxide. Component (a) may be provided as a metal oxide that has been surface-treated with a hydrophobic agent. Surface treatment of the metal oxide with a hydrophobic agent can inhibit aggregation within the metal oxide, helping to more evenly and stably disperse the metal oxide in the cosmetic composition. The hydrophobized metal oxide may also be a hydrophobized metal oxide pigment. By including a hydrophobized metal oxide it is possible to adjust the color tone of the cosmetic composition while maintaining the features of 1) to 3) mentioned above.

[0025] Examples of metal oxides to be surface treated include titanium dioxide, iron oxide, zinc oxide, cerium oxide, aluminum oxide, bengala, Prussian blue chromium oxide and chromium hydroxide.

[0026] The hydrophobized metal oxide may include a hydrophobized titanium dioxide and a hydrophobized iron oxide.

[0027] The cosmetic composition may also include a non-hydrophobized metal oxide other than component (a) as a metal oxide. Specifically, it may include any metal oxide mentioned as a metal oxide for component (a) that has not been hydrophobically treated.

[0028] The hydrophobic agent may be one or more selected from the group consisting of titanate-based surface treatment agents, amino acid-based surface treatment agents, metal soap-based surface treatment agents, ester-based surface treatment agents, silicone-based surface treatment agents, silane-based surface treatment agents, fluorine compound-based surface treatment agents and lipid-based surface treatment agents.

[0029] Examples of titanate-based surface treatment agents include isopropyltitanium triisostearate, isopropyltitanium tristearate, triisopropyltitanium isostearate, isopropyltitanium tripalmitate and isopropyltitanium trimyristate.

[0030] Examples of amino acid-based surface treatment agents include glycine, alanine, sarcosine, proline, hydroxyproline, aspartic acid, glutamic acid and lysine. These amino acids may also be acylated with fatty acids. The fatty acid is preferably a saturated or unsaturated fatty acid of 1 to 22 carbon atoms, and more preferably a saturated or unsaturated fatty acid of 8 to 20 carbon atoms. Such acylated amino acid-based surface treatment agents include stearoylglutamic acid, lauroylglutamic acid, lauroylaspartic acid, myristoylglutamic acid, stearoyllysine, lauroyllysine, myristoyllysine and palmitoylproline. A preferred acylated amino acid is stearoylglutamic acid. An amino acid salt may be a sodium, potassium, calcium, magnesium or aluminum salt. Specific examples of acylated amino acid-based surface treatment agents in salt form include sodium myristoylglutamate, disodium stearoylglutamate, sodium lauroyl aspartate, dilauramidoglutamide lysine sodium, palmitoylsarcosine sodium, magnesium palmitoylglutamate and disodium cocoylglutamate.

[0031] Examples of metal soap-based surface treatment agents include aluminum dimyristate, magnesium stearate and magnesium myristate.

[0032] Examples of ester-based surface treatment agents include isostearyl sebacate, dextrin fatty acid esters and polyglyceryl-2 tetraisostearate. Dextrin isostearate is a specific example of an esteric surface treatment agent which is a dextrin fatty acid.

[0033] Examples of silicone-based surface treatment agents include methicone, hydrogen dimethicone, dimethicone and dimethiconol.

[0034] Silane-based surface treatment agents include trialkoxysilanes such as trimethoxycaprylylsilane and triethoxycaprylylsilane.

[0035] Examples of fluorine compound-based surface treatment agents include perfluorohexylethyltriethoxysilane, trifluoropropyltrimethoxysilane, trifluoropropyltriethoxysilane, tridecafluorooctyltrimethoxysilane and tridecafluorooctyltriethoxysilane.

[0036] Examples of other lipid-based surface treatment agents include phospholipids, lecithin, triglycerides, fats and oils, waxes, glycolipids and acrylic-based surface treatment agents.

[0037] Examples of acrylic surface treatment agents include random copolymerized products with ethyl (meth)acrylate, butyl (meth)acrylate, octyl (meth)acrylate, decyl (meth)acrylate, lauryl (meth)acrylate, myristyl (meth)acrylate, palmityl (meth)acrylate, stearyl (meth)acrylate, oleyl (meth)acrylate or linoleyl (meth)acrylate.

[0038] Component (a) is preferably a metal oxide that has been hydrophobized with one or more hydrophobic agents selected from the group consisting of sodium dilauramidoglutamide lysine, dextrin isostearate, sodium lauroyl aspartate, isopropyl titanium triisostearate, disodium stearoyl glutamate, sodium myristoyl glutamate and a glycolipid.

[0039] In order to obtain a hydrophobized metal oxide, aluminum hydroxide may be used as a surface treatment agent in addition to the hydrophobic agent. When the metal oxide is one with catalytic activity, such as titanium oxide, aluminum hydroxide is particularly effective for blocking the catalytic activity.

[0040] The content of component (a) may be 1.0 to 40 mass%, and preferably 1.0 to 35 mass%, 1.0 to 30 mass%, 1.0 to 25 mass%, 1.0 to 20 mass%, 5.0 to 40 mass%, 5.0 to 35 mass%, 5.0 to 30 mass%, 5.0 to 25 mass%, 5.0 to 20 mass%, 7.0 to 40 mass%, 7.0 to 35 mass%, 7.0 to 30 mass%, 7.0 to 25 mass% or 7.0 to 20 mass%, based on the total amount of the cosmetic composition. This can further aid in obtaining a coverage effect, a lightweight, thin make-up film layer and robust stability.

[0041] The particle size of component (a) may be 10 nm to 1 μm.

[0042] The oil-in-water emulsion cosmetic composition of the embodiment comprises component (b): a nonionic surfactant with an HLB value of greater than 12. The HLB value of component (b) may be 13 or greater, 14 or greater or 15 or greater, and 18 or lower, 17.5 or lower or 17 or lower. The HLB value of component (b) may be 13 to 18, 13 to 17.5, 13 to 17, 14 to 18, 14 to 17.5, 14 to 17, 15 to 18, 15 to 17.5 or 15 to 17.

[0043] Component (b) may be of a single type, or several different types may be used in combination. When component (b) includes several different types, it is sufficient for the HLB value of component (b) as a whole to be greater than 12, in which case the HLB value is calculated as the weighted average of the HLB values of the components.

[0044] The HLB value is an index representing the ratio of the relative affinity of a surfactant with respect to both liquids in an oil-aqueous system, and the HLB value used for the purpose of the invention is based on the definition of Griffin, at 25°C. The Griffin HLB value is described in J. Soc. Cosm. Chem., 1954, 5:249-256.

[0045] Examples for component (b) include polysorbate-based nonionic surfactants, polyethylene glycol (PEG)-based nonionic surfactants and polyglyceryl-based nonionic surfactants.

[0046] Polysorbate-based nonionic surfactants include, specifically, polysorbate 20 (HLB value: 16.7), polysorbate 40 (HLB value: 15.6), polysorbate 60 (HLB value: 14.9) and polysorbate 80 (HLB value: 13.0).

[0047] PEG-based nonionic surfactants include, specifically, PEG stearate nonionic surfactants such as PEG-20 stearate (HLB value: 14.0), PEG-40 stearate (HLB value: 16.0) and PEG-100 stearate (HLB value: 17.0), and PEG castor oil-based nonionic surfactants such as PEG-40 hydrogenated castor oil (HLB value: 12.5), PEG-50 hydrogenated castor oil (HLB value: 13.5), PEG-60 hydrogenated castor oil (HLB value: 15.0 to 17.0), PEG-80 hydrogenated castor oil (HLB value: 15.0) and PEG-100 hydrogenated castor oil (HLB value: 16.5).

[0048] Polyglyceryl-based nonionic surfactants include, specifically, polyglyceryl-10 isostearate (HLB value: 13.7), polyglyceryl-10 myristate (HLB value: 14.8), polyglyceryl-10 stearate (HLB value: 14.1) and polyglyceryl-10 laurate (HLB value: 15.3).

[0049] Of these nonionic surfactants, component (b) preferably includes a PEG castor oil-based nonionic surfactant, and more preferably includes PEG-60 hydrogenated castor oil and PEG-100 hydrogenated castor oil. This will provide a comfortable texture with excellent emulsion stability.

[0050] The content of component (b) may be 0.5 to 10 mass%, and preferably 1.0 to 10 mass%, 1.5 to 10 mass%, 2.0 to 10 mass%, 2.5 to 10 mass%, 1.0 to 8.0 mass%, 1.5 to 8.0 mass%, 2.0 to 8.0 mass%, 2.5 to 8.0 mass%, 1.0 to 6.0 mass%, 1.5 to 6.0 mass%, 2.0 to 6.0 mass%, 2.5 to 6.0 mass%, 1.0 to 5.0 mass%, 1.5 to 5.0 mass%, 2.0 to 5.0 mass%, 2.5 to 5.0 mass%, 1.0 to 4.5 mass%, 1.5 to 4.5 mass% or 2.0 to 4.5 mass%, such as 2.5 to 4.5 mass%, based on the total amount of the cosmetic composition. If the content of component (b) is within this range, the emulsified state will be more stabilized and a higher coverage effect and more comfortable texture can be obtained.

[0051] The oil-in-water emulsion cosmetic composition of the embodiment comprises component (c): an oil-soluble dispersant. Component (c) functions mainly to disperse component (a) and cause it to stably exist in oil droplets. If component (a) can stably exist in oil droplets then development of color irregularities can be reduced.

[0052] Examples for component (c) include hydroxy fatty acid esters of polyglycerin and sorbitan fatty acid esters. Component (c) preferably includes a hydroxy fatty acid ester of polyglycerin. This will result in more excellent properties for the features of 1) to 3). Component (c) also preferably includes a hydroxy fatty acid ester of polyglycerin and a sorbitan fatty acid ester. This will result in more excellent properties for the features of 1) to 3), and especially more excellent emulsion stability.

[0053] The hydroxy fatty acid ester of polyglycerin is the reaction product of polyglycerin and a hydroxy fatty acid. The mean polymerization degree of the polyglycerin in the polyglycerin fatty acid ester may be 2 to 12, 2 to 10, 2 to 8 or 2 to 6. This will further improve the stability of the cosmetic composition.

[0054] The hydroxy fatty acid forming the hydroxy fatty acid ester of polyglycerin may be a fatty acid of 8 to 24 carbon atoms, a fatty acid of 10 to 20 carbon atoms or a fatty acid of 12 to 18 carbon atoms. This will further improve the stability of the cosmetic composition. Such fatty acids may be saturated or unsaturated. The hydroxy fatty acid forming the hydroxy fatty acid ester of polyglycerin may be a fatty acid having one or more hydrogens of a hydrocarbon group replaced with a hydroxyl group, in a fatty acid such as palmitic acid, palmitoleic acid, stearic acid, oleic acid, linoleic acid, α-linolenic acid, γ-linolenic acid, isostearic acid, arachidic acid, arachidonic acid, behenic acid or ricinolic acid.

[0055] The hydroxy fatty acid ester of polyglycerin may also include one or more selected from the group consisting of mono- or polyhydroxy fatty acid esters of polyglycerin. A polyhydroxy fatty acid may be, for example, a homopolymer of the aforementioned hydroxy fatty acids, and specifically polyhydroxystearic acid or polyricinoleic acid.

[0056] Mono- or polyhydroxy fatty acid esters of polyglycerin can be represented by the following general formula (1).

[0057] (Chemical Formula 1) (In formula (1), R11is a group represented by general formula (2) below or a hydrogen atom, with at least one of the R11groups being a group represented by general formula (2). The letter r represents a number of 2 or greater.) The letter r may be 2 to 12, 2 to 10, 2 to 8 or 2 to 6.

[0058] (Chemical Formula 2) (In formula (2), R21is a monovalent saturated or unsaturated hydrocarbon group in which one or more hydrogens of the hydrocarbon group is the residue of a hydroxy fatty acid or its polymer. The symbol * represents a bonding site.)

[0059] Specific compounds of hydroxy fatty acid esters of polyglycerin include polyglyceryl-3 polyricinoleate, polyglyceryl-4 polyricinoleate, polyglyceryl-5 polyricinoleate, polyglyceryl-6 polyricinoleate, polyglyceryl-10 polyricinoleate, polyglyceryl-2 dipolyhydroxyateate and polyglyceryl-6 polyhydroxyateate.

[0060] The sorbitan fatty acid ester is the reaction product of sorbitan and a fatty acid. Sorbitan has four fatty acid-reactive hydroxyl groups per molecule, with 1, 2, 3 or 4 of the four hydroxyl groups potentially reacting with a fatty acid to form a sorbitan fatty acid ester. For example, a mono-fatty acid ester of sorbitan is the reaction product of one of the four hydroxyl groups of sorbitan with a fatty acid, a di-fatty acid ester of sorbitan is the reaction product of two hydroxyl groups with a fatty acid, and a sesqui-fatty acid ester of sorbitan is a mixture of these, being the reaction product of sorbitan with an average of 1.5 fatty acids.

[0061] The sorbitan fatty acid ester may include a mono-fatty acid ester of sorbitan, a sesqui-fatty acid ester of sorbitan or a di-fatty acid ester of sorbitan. This will help provide the cosmetic composition with a comfortable skin finish and robust stability. Such sorbitan fatty acid esters include sorbitan sesquioleate, sorbitan sesquiisostearate, sorbitan isostearate and sorbitan oleate.

[0062] Sorbitans composing sorbitan fatty acid esters include 1,4-sorbitans having a tetrahydrofuran skeleton and 1,5-sorbitans having a tetrahydropyran skeleton, and the sorbitan fatty acid ester may comprise any of these skeletons, or it may be a mixture of compounds having such skeletons.

[0063] The fatty acid forming the sorbitan fatty acid ester may be a fatty acid of 12 to 24, 16 to 22 or 16 to 20 carbon atoms, and may be either a saturated fatty acid or an unsaturated fatty acid. Examples of such fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid and oleic acid.

[0064] Specific examples of sorbitan fatty acid esters include sorbitan sesquiisostearate, sorbitan monoisostearate and sorbitan oleate.

[0065] Isostearic acid may also be used as component (c).

[0066] The content of component (c) may be 0.01 to 5 mass%, and preferably 0.05 to 5 mass%, 0.1 to 5 mass%, 0.5 to 5 mass%, 0.7 to 5 mass%, 0.05 to 3 mass%, 0.1 to 3 mass%, 0.5 to 3 mass%, 0.7 to 3 mass%, 0.05 to 1.5 mass%, 0.1 to 1.5 mass%, 0.5 to 1.5 mass% or 0.7 to 1.5 mass%, based on the total amount of the cosmetic composition. If the content of component (c) is within this range, the emulsified state will be more stabilized and a higher coverage effect and more comfortable texture can be obtained.

[0067] The oil-in-water emulsion cosmetic composition of the embodiment comprises a water-soluble dispersant comprising an amino acid-based anionic surfactant (component (d)). The amino acid-based anionic surfactant is an anionic surfactant with an amino acid as a group. By comprising component (d) it is possible to uniformly and stably disperse component (a) in the cosmetic composition, to improve the light texture and stability.

[0068] The amino acid-based anionic surfactant may be an alkali metal salt as the reaction product of an amino acid and a fatty acid, for example. Amino acids and fatty acids form compounds with amide bonds.

[0069] The amino acid composing the amino acid-based anionic surfactant may be glutamic acid, glycine, alanine, serine or lysine.

[0070] The fatty acid composing the amino acid-based anionic surfactant may be a fatty acid of 8 to 24 carbon atoms, a fatty acid of 10 to 20 carbon atoms or a fatty acid of 12 to 18 carbon atoms. This will further improve the stability of the cosmetic composition. Such fatty acids may be saturated or unsaturated. The fatty acid composing the amino acid-based anionic surfactant may be, more specifically, palmitic acid, palmitoleic acid, stearic acid, oleic acid, linoleic acid, α-linolenic acid, γ-linolenic acid, isostearic acid, arachidic acid, arachidonic acid, behenic acid or ricinolic acid.

[0071] Examples of alkali metals include potassium and sodium.

[0072] Specific examples of amino acid-based anionic surfactants include sodium dilauramidoglutamide lysine, sodium stearoyl glutamate, sodium cocoyl glutamate, sodium lauroyl glutamate and sodium myristoyl glutamate. Component (d) may be of a single type, or several different types may be used in combination.

[0073] The content of component (d) may be 0.01 to 2.0 mass%, and is preferably 0.05 to 2.0 mass%, 0.1 to 2.0 mass%, 0.2 to 2.0 mass%, 0.05 to 1.5 mass%, 0.1 to 1.5 mass%, 0.2 to 1.5 mass%, 0.05 to 1.0 mass%, 0.1 to 1.0 mass% or 0.2 to 1.0 mass%, based on the total amount of the cosmetic composition. This can further aid in obtaining a coverage effect, a lightweight, thin make-up film layer and robust stability.

[0074] The oil-in-water emulsion cosmetic composition of the embodiment also comprises component (e): an oil-soluble UV filter which is in solid form at 25°C and has a triazine or triazole skeleton. Component (e) absorbs or scatters ultraviolet rays, helping to prevent ultraviolet rays from reaching the skin. Component (e) may be one that does not comprise ethylhexyl methoxycinnamate. The oil-in-water emulsion cosmetic composition of the embodiment comprising component (e) can exhibit an ultraviolet protection effect while maintaining the features of 1) to 3) described above, even without comprising ethylhexyl methoxycinnamate.

[0075] Examples for component (e) include triazine-based oil-soluble ultraviolet filters such as bis-ethylhexyloxyphenol methoxyphenyl triazine and ethylhexyltriazone, and triazole-based oil-soluble ultraviolet filters such as drometrizole trisiloxane.

[0076] The content of component (e) may be 1.0 to 10 mass%, and is preferably 1.0 to 10 mass%, 1.0 to 8.0 mass%, 1.0 to 6.0 mass%, 1.0 to 4.5 mass%, 1.5 to 10 mass%, 1.5 to 8.0 mass%, 1.5 to 6.0 mass% or 1.5 to 4.5 mass%, based on the total amount of the cosmetic composition. This can further aid in obtaining a coverage effect, a lightweight, thin make-up film layer and robust stability.

[0077] The oil-in-water emulsion cosmetic composition of the embodiment also comprises component (f): an ester oil, with component (f) including one or more selected from the group consisting of an ester of caprylic acid and / or capric acid, a dialkyl carbonate where at least one of the alkyl groups has 8 or fewer carbon atoms, and a dialkyl succinate where at least one of the alkyl groups has 8 or fewer carbon atoms.

[0078] Component (f) forms oil droplets in the oil-in-water emulsion cosmetic composition of the embodiment. By having component (a) stably present in the oil droplets, development of color irregularities during use can be reduced while maintaining the features of 1) to 3). The cosmetic composition comprising component (f) has excellent stability, with resistance to deposition of component (e).

[0079] An ester of caprylic acid and / or capric acid is the reaction product between an alcohol and caprylic acid and / or capric acid.

[0080] The alcohol composing the ester of caprylic acid and / or capric acid may be a monoalcohol or a polyol. The number of carbon atoms of a monoalcohol may be 6 to 20, 6 to 18 or 6 to 16. Monoalcohols include, specifically, lauryl alcohol, myristyl alcohol, cetyl alcohol and stearyl alcohol. The alcohol composing the ester of caprylic acid and / or capric acid may be of a single type, or a combination of severarl different types such as a coco alcohol.

[0081] The carbon atoms of a polyol composing the ester of caprylic acid and / or capric acid may be 6 to 20, 6 to 18 or 6 to 16. The number of hydroxyl groups of a polyol composing the ester of caprylic acid and / or capric acid may be 2, 3, 4 or more. Specific polyols include ethylene glycol, glycerin and propylene glycol.

[0082] The ester of caprylic acid and / or capric acid may be, specifically, a cocoalkyl caprylate or cocoalkyl caprate.

[0083] A dialkyl carbonate where at least one of the alkyl groups has 8 or fewer carbon atoms may be represented by the following general formula (3).

[0084] (Chemical Formula 3) (In formula (3), R31is an alkyl group of 1 to 8 carbon atoms, and R32is an alkyl group of one or more carbon atoms.)

[0085] The number of carbon atoms of the alkyl group represented by R31in formula (3) may be 2 to 8, 4 to 8 or 6 to 8. The number of carbon atoms of the alkyl group represented by R32may be 1 to 20, 1 to 16, 1 to 12 or 1 to 8. R31and R32may be the same or different.

[0086] A dialkyl carbonate where at least one of the alkyl groups has 8 or fewer carbon atoms may be, specifically, dicaprylyl carbonate or diethylhexyl carbonate.

[0087] A dialkyl succinate where at least one of the alkyl groups has 8 or fewer carbon atoms may be represented by the following general formula (4).

[0088] (Chemical Formula 4) (In formula (4), R41is an alkyl group of 1 to 8 carbon atoms, and R42is an alkyl group of one or more carbon atoms.)

[0089] The number of carbon atoms of the alkyl group represented by R41in formula (4) may be 2 to 8, 4 to 8 or 6 to 8. The number of carbon atoms of the alkyl group represented by R42may be 1 to 20, 1 to 16, 1 to 12 or 1 to 8. R41and R42may be the same or different.

[0090] A dialkyl succinate where at least one of the alkyl groups has 8 or fewer carbon atoms may be, specifically, diethylhexyl succinate.

[0091] The content of component (f) may be 1.0 to 40 mass%, and preferably 1.0 to 35 mass%, 1.0 to 30 mass%, 1.0 to 25 mass%, 1.0 to 20 mass%, 5.0 to 35 mass%, 5.0 to 30 mass%, 5.0 to 25 mass%, 5.0 to 20 mass%, 10 to 35 mass%, 10 to 30 mass%, 10 to 25 mass% or 10 to 20 mass%, based on the total amount of the cosmetic composition. This can further aid in obtaining a coverage effect, a lightweight, thin make-up film layer and robust stability.

[0092] The cosmetic composition according to one embodiment may also comprise component (g): a water-soluble thickener. By comprising a water-soluble thickener, the viscosity of the cosmetic composition can be increased, with the increased viscosity resulting in a higher coverage effect and long-lasting effect, and helping to exhibit an effect of reducing aggregation and / or caking of the metal oxide with long-term storage.

[0093] Examples for component (g) include gum arabic, guar gum, carrageenan, gellan gum, tamarind gum, agar, pullulan, xanthan gum, hyaluronic acid, sodium hyaluronate, methyl cellulose, hydroxypropyl methylcellulose, hydroxyethyl cellulose, (ammonium acryloyldimethyl taurate / VP) copolymer, (ammonium acryloyldimethyltaurate / beheneth-25 methacrylate) crosspolymer, (acrylate / C10-30 / alkyl acrylate crosspolymer, and hydroxyethyl acrylate / sodium acryloyldimethyl taurate copolymer.

[0094] The content of component (g) may be 0.01 to 5.0 mass%, and is preferably 0.05 to 5.0 mass%, 0.05 to 3.0 mass%, 0.05 to 1.0 mass%, 0.1 to 5.0 mass%, 0.1 to 3.0 mass%, 0.1 to 1.0 mass%, 0.3 to 5.0 mass%, 0.3 to 3.0 mass% or 0.3 to 1.0 mass%, based on the total amount of the cosmetic composition.

[0095] The cosmetic composition of the embodiment may also further comprise component (h): an oil-soluble UV filter which is in liquid form at 25°C. By comprising an oil-soluble UV filter which is in liquid form, the effect of preventing ultraviolet rays from reaching the skin is improved.

[0096] Examples for component (h) include ethylhexyl salicylate, octyl methoxycinnamate, homosalate and octocrylene.

[0097] The content of component (h) may be 0.5 to 10 mass%, and preferably 1.0 to 10 mass%, 1.5 to 10 mass%, 2.0 to 10 mass%, 2.5 to 10 mass%, 1.0 to 8.0 mass%, 1.5 to 8.0 mass%, 2.0 to 8.0 mass%, 2.5 to 8.0 mass%, 1.0 to 6.0 mass%, 1.5 to 6.0 mass%, 2.0 to 6.0 mass% or 2.5 to 6.0 mass%, based on the total amount of the cosmetic composition.

[0098] The aqueous phase component of the cosmetic composition of the embodiment may also include one or more selected from the group consisting of purified water and alcohols.

[0099] An alcohol may include a polyol of 1 to 8 carbon atoms. Examples of polyols of 1 to 8 carbon atoms include ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol (propanediol), 1,3-butylene glycol, 1,2-pentanediol (pentylene glycol), 1,2-hexanediol, 1,2-octanediol and glycerin.

[0100] The content of the polyol of 1 to 8 carbon atoms may be 0.5 to 30 mass%, 0.5 to 25 mass%, 0.5 to 20 mass%, 0.5 to 15 mass%, 0.5 to 10 mass% or 0.5 to 5 mass%, based on the total amount of the cosmetic composition. If the content of the polyol of 1 to 8 carbon atoms is within this range it will be possible to further increase the moisturizing effect without destabilizing the emulsified state.

[0101] The alcohol may also include a monool of 1 to 3 carbon atoms. Examples of monools of 1 to 3 carbon atoms include ethanol, 1-propanol and 2-propanol (isopropanol).

[0102] The content of the monool of 1 to 3 carbon atoms may be 0.5 to 20 mass%, 0.5 to 15 mass%, 0.5 to 10 mass% or 0.5 to 5 mass%, based on the total amount of the cosmetic composition. If the content of the monool of 1 to 3 carbon atoms is within this range it will be easier to form a homogeneous film, and the coverage effect and long-lasting effect can be further increased.

[0103] Alcohols may include higher alcohols. Higher alcohols are aliphatic monoalcohols of 6 or more carbon atoms, and preferably aliphatic monoalcohols of 12 to 28 carbon atoms. Examples of higher alcohols include stearyl alcohol, behenyl alcohol, octyldodecanol, batyl alcohol and cetyl alcohol.

[0104] The content of the higher alcohol may be 0.1 to 10 mass%, 0.1 to 8 mass%, 0.1 to 6 mass% or 0.1 to 4 mass%, based on the total amount of the cosmetic composition. If the higher alcohol content is within this range it will be possible to increase the emulsion stability.

[0105] The content of the aqueous phase component may be 10 to 80 mass%, 15 to 70 mass%, 20 to 60 mass%, 25 to 50 mass%, 30 to 45 mass% or 35 to 45 mass%, based on the total amount of the cosmetic composition. If the content of the aqueous phase component is within this range, then the freshness and coverage effect will be further improved when the cosmetic composition is applied onto skin, and the robust stability of the cosmetic composition will be further improved.

[0106] The cosmetic composition according to one embodiment may further comprise a spherical powder such as silica, cellulose or starch; a stabilizer, for example, a salt of citric acid such as trisodium citrate; an antimicrobial agent; an antioxidant such as hydroxyacetophenone or sodium pyrosulfite; an aromatic; a neutralizer such as arginine; an antiseptic agent such as chlorphenesin; or an active ingredient. The cosmetic composition according to one embodiment may further include one or more from among salicylic acid esters, hydrophobized silica and hydrophobized cellulose, which can increase the effects of the features of 1) to 3) described above in a balanced manner.

[0107] The cosmetic composition according to one embodiment, and particularly a liquid cosmetic composition, may have a viscosity at 25°C that is 500 to 6000 cP (500 to 6000 mPa.s (millipascal second)), 800 to 3000 cP (800 to 3000 mPa.s (millipascal second)) or 1000 to 2000 cP (1000 to 2000 mPa.s (millipascal second)). The viscosity is measured using a rotational viscometer (for example, a Rheolab QC by Anton Paar GmbH), inserting an ST22-4V-40 spindle into the cosmetic composition that is housed in a container with an inner diameter of 4.5 cm and kept at 25°C, with measurement for 3 minutes at a rotational speed of 100 rpm.

[0108] The cosmetic composition according to one embodiment can be produced by the following procedure, for example. Specifically, first the oil-soluble components including component (c), component (f) and component (h) are mixed, component (e) is dissolved in the mixture, and then component (a) is added to obtain an oil-soluble component liquid mixture. The water-soluble components such as component (b), component (d) and component (g) are then mixed and the oil-soluble component liquid mixture is combined with the obtained water-soluble component liquid mixture to obtain the cosmetic composition.

[0109] The cosmetic composition according to one embodiment may be filled into a tube, jar or bottle container for use as a liquid foundation, cream foundation, concealer or cosmetic base, or it may be used as a cushion foundation. A cushion foundation is a cosmetic product having a liquid foundation soaked into a cushion (puff), and for example, a cushion foundation may be a foamed body such as a sponge impregnated with the cosmetic composition (foundation) of the invention.

[0110] A cosmetic product, according to one embodiment, comprises a support and a cosmetic composition of the invention impregnated in the support. The support may be a water-insoluble support. Water-insoluble supports include nonwoven fabrics made of simple or composite materials such as resins, pulp or cotton; resin-coated fiber materials; foamed bodies such as sponges, and porous bodies with continuous structures. The material of the support may be, for example, NBR (acrylonitrile-butadiene rubber), SBR (styrene-butadiene rubber), NR (natural rubber), urethane, nylon, polyolefin, polyester, EVA (ethylene-vinyl acetate), PVA (polyvinyl alcohol) or silicone elastomer, but there is no limitation to these materials so long as they can be impregnated with the cosmetic composition.

[0111] The cosmetic product according to one embodiment may be a cushion foundation, cushion BB cream, cushion concealer or cushion cosmetic base.Example

[0112] The present invention will now be explained by the following Examples, with the understanding that the invention is not limited by the Examples.

[0113] (Examples 1 to 9 and Comparative Examples 10 to 17) Cosmetic compositions for Examples 1 to 9 and Comparative Examples 10 to 17 were prepared by the following procedure using the components listed in Tables 1 to 4. The units for the contents of each of the components in Tables 1 to 4 are given in mass%. The particle sizes of each of the metal oxides of component (a) listed in Tables 1 to 4 were all 100 nm to 1 μm, and the trade names and manufacturers of the components listed in Tables 1 to 4 are as shown in Table 5. Step 1: Component (e) was heated and dissolved at 85°C in component (c), component (f) and component (h), and then cooled to room temperature, after which component (a) was added and the components were mixed using a homogenizer. Step 2: Component (b) was heated and dissolved in water at 45°C and then cooled to room temperature, after which glycerin, butylene glycol, pentylene glycol, ethanol, arginine, hydroxyacetophenone, chlorphenesin, component (d) and component (g) were mixed using a homogenizer at room temperature. Step 3: The mixture obtained in step 1 was added to the mixture obtained in step 2, and the resulting mixture was emulsified using a homogenizer.

[0114] In Comparative Example 10, a non-hydrophobized metal oxide was used instead of component (a). In Comparative Example 11, component (b) was not used. In Comparative Example 12, component (c) was not used. In Comparative Example 13, component (d) was not used. In Comparative Example 14, a water-soluble dispersant that does not comprise an amino acid-based anionic surfactant was used instead of component (d). In Comparative Example 15, a water-soluble dispersant that does not comprise an amino acid-based anionic surfactant was used instead of component (d). In Comparative Example 16, C9-12 alkane was used instead of component (f). In Comparative Example 17, dimethicone was used instead of component (f).

[0115]

[0116]

[0117]

[0118]

[0119]

[0120] The properties of the cosmetic compositions of the Examples and Comparative Examples were measured by the following methods. The results are shown in Table 6.

[0121] (Coverage effect, long-lasting effect, fresh sensation and light-weight finish) The cosmetic compositions of Examples 1 to 9 and Comparative Examples 10 to 17 were applied onto the facial skin of 10 cosmetic expert evaluators (25 to 55 years of age), and the coverage effect, long-lasting effect and comfortable texture (fresh sensation and light-weight finish) were evaluated on the following scale.

[0122] (1) Coverage effect A: Excellent (e.g.: complete covering of redness or blemishes). B: Very good (e.g.: no visible redness, but 1 or 2 evaluators had slightly visible blemishes). C: Good (e.g.: no visible redness, but 3 to 5 evaluators had slightly visible blemishes). D: Poor (e.g.: 1 or 2 evaluators had visible redness or blemishes). E: Very poor (e.g.: 3 to 5 evaluators had visible redness or blemishes). F: Extremely poor (e.g.: 6 to 10 evaluators had visible redness or blemishes).

[0123] (2) Long-lasting effect A: Excellent (e.g.: no breakup of cosmetic even after 8 hours.) B: Very good (e.g.: no breakup of cosmetic after 4 hours, but breakup of cosmetic experienced by 1 or 2 evaluators after 8 hours.) C: Good (e.g.: no breakup of cosmetic after 4 hours, but breakup of cosmetic experienced by 3 to 5 evaluators after 8 hours.) D: Poor (e.g.: breakup of cosmetic experienced by 1 or 2 evaluators after 4 hours.) E: Very poor (e.g.: breakup of cosmetic experienced by 3 to 5 evaluators after 4 hours.) F: Extremely poor (e.g.: breakup of cosmetic experienced by 6 to 10 evaluators after 4 hours.)

[0124] (3) Fresh sensation A: Excellent (e.g.: very strong fresh sensation, absolutely no stickiness felt.) B: Very good (e.g.: strong fresh sensation, virtually no stickiness felt.) C: Good (e.g.: fresh sensation but slight stickiness felt). D: Poor (e.g.: fresh sensation but stickiness also felt.) E: Very poor (e.g.: no fresh sensation, stickiness felt). F: Extremely poor (e.g.: no fresh sensation, considerable stickiness felt).

[0125] (4) Light-weight finish A: Excellent (e.g.: lack of blocking feel and absolutely no unnatural finish feel). B: Very good (e.g.: slight blocking feel but no unnatural finish feel). C: Good (e.g.: blocking feel but no unnatural finish feel). D: Poor (e.g.: blocking feel and slight unnatural finish feel). E: Very poor (e.g.: blocking feel and unnatural finish feel). F: Extremely poor (e.g.: blocking feel and considerable unnatural finish feel).

[0126] (Stability evaluation) (Precipitation tendency) The cosmetic compositions of the Examples and Comparative Examples were each placed in a transparent container and sealed with a cover and then stored for one month at 4°C, and the outer appearance of the cosmetic composition after storage was visually observed, noting the degree of precipitation of the components (precipitation tendency). Samples with no observable precipitation of the components were assessed as "a", samples with slight observable precipitation of components but without problems during use were assessed as "b", and samples with precipitation of components affecting the light texture were assessed as "c".

[0127] (Emulsion stability) The cosmetic compositions of the Examples and Comparative Examples were each placed in a transparent container and sealed with a cover, prior to storing for 1 month at 50°C. As a control, each cosmetic composition was placed in a transparent container and sealed with a cover, and stored for 1 month at room temperature. The stored cosmetic composition container was shaken 10 times and allowed to stand, and the outer appearance was visually observed. Samples with no difference in deterioration of the emulsified state or aggregation of powder compared to the control were assessed as "a", samples with slight difference from the control but without problems during use were assessed as "b", and samples with a clear difference from the control, with separation of the oil phase or aqueous phase or non-uniform dispersion of the metal oxide, resulting in uneven color, were assessed as "c".

[0128]

Claims

1. An oil-in-water emulsion cosmetic composition, comprising: (a) a hydrophobized metal oxide, (b) a nonionic surfactant with an HLB value of greater than 12, (c) an oil-soluble dispersant, (d) a water-soluble dispersant comprising an amino acid-based anionic surfactant, (e) an oil-soluble UV filter which is in solid form at 25°C and has a triazine or triazole skeleton, and (f) an ester oil comprising at least one selected from the group consisting of an ester of caprylic acid and / or capric acid, a dialkyl carbonate where at least one of the alkyl groups has 8 or fewer carbon atoms and a dialkyl succinate where at least one of the alkyl groups has 8 or fewer carbon atoms.

2. The cosmetic composition according to claim 1, wherein component (a) comprises a hydrophobized titanium dioxide and a hydrophobized iron oxide.

3. The cosmetic composition according to claim 1 or 2, wherein component (a) is a metal oxide hydrophobized by at least one selected from the group consisting of sodium dilauramidoglutamide lysine, dextrin isostearate, sodium lauroyl aspartate, isopropyl titanium triisostearate, disodium stearoyl glutamate, sodium myristoyl glutamate and a glycolipid.

4. The cosmetic composition according to any one of claims 1 to 3, wherein component (c) comprises a hydroxy fatty acid ester of polyglycerin.

5. The cosmetic composition according to any one of claims 1 to 4, further comprising (g) a water-soluble thickener.

6. The cosmetic composition according to any one of claims 1 to 5, further comprising (h) an oil UV filter which is in liquid form at 25°C.

7. The cosmetic composition according to any one of claims 1 to 6, wherein the cosmetic composition comprises 1.0 to 40 mass% of component (a), 0.5 to 10 mass% of component (b), 0.01 to 5 mass% of component (c), 0.01 to 2.0 mass% of component (d), 1.0 to 10 mass% of component (e) and 1.0 to 40 mass% of component (f), based on the total amount of the composition.

8. The cosmetic composition according to any one of claims 1 to 7, wherein the cosmetic composition is in the form of a foundation.

9. A cosmetic process for caring for and / or making-up keratinic materials, wherein the cosmetic process comprises the application onto keratinic materials, in particular onto skin, of the oil-in-water emulsion cosmetic composition according to any one of claims 1 to 8.

10. The cosmetic process according to claim 9, wherein the oil-in-water emulsion cosmetic composition provides the keratinic materials on which it is applied with a high coverage effect, comfortable texture and robust stability.

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