Oil-in-water cosmetics

Abstract

To provide a cosmetic that gives a good flavor and also has high stability, the cosmetic containing an oil-based capsule.SOLUTION: An oil-in-water cosmetic contains (A) an oil-based capsule containing (A1) solid oil and (A2) liquid oil with an average particle size of 100 μm or more and (B) a flavor complex containing (B1) a surfactant with an HLB of 8.5 or more and (B2) a flavor.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to an oil-in-water cosmetic composition, and more particularly to an oil-in-water cosmetic composition comprising oily capsules of a visible size. [Background technology]

[0002] Oil-in-water emulsion cosmetics are known in which large oily particles with an average particle size of 50 μm to 10 mm are dispersed in an aqueous phase. Cosmetics containing such large oily particles are not only visually novel and beautiful because the oily particles are dispersed in a visible size, but also provide a fresh, refreshing feel when applied to the skin, which gradually becomes moisturized over time, providing an unprecedented feel when used. Furthermore, retaining degradable oil-soluble components in the large oily particles also has the effect of inhibiting the decomposition of the oil-soluble components. For example, Patent Document 1 discloses a capsule-containing cosmetic in which oily capsules with an average particle size of 100 μm or more containing an oily component that is solid at room temperature are dispersed in an aqueous medium.

[0003] Microcapsules encapsulating fragrances have been widely used in laundry detergents and deodorants, and are expected to have the effect of sustained release of a pleasant fragrance. In cosmetics, users' demands for fragrances are also increasing, and technologies for encapsulating fragrances in microcapsules have been developed. Cosmetics containing the above-mentioned large oily capsules are required to have a good fragrance. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-104131 Summary of the Invention

[0005] It has been found that when a fragrance is encapsulated in the above-mentioned oil-based capsule-containing cosmetics in order to achieve a good fragrance release, it is difficult to achieve a good fragrance release. It has also been found that it is difficult to achieve a good fragrance release by simply blending the fragrance outside the capsule without encapsulating it in the capsule. In this situation, the present inventors have surprisingly discovered that by forming a fragrance complex containing a specific surfactant and a fragrance separately from the oil capsules and incorporating the fragrance complex outside the capsules, it is possible to provide a cosmetic preparation that is excellent in fragrance release and stability. The present invention is based on these findings.

[0006] Therefore, the present invention discloses a cosmetic comprising an oily capsule and a fragrance complex.

[0007] According to the present invention, the following inventions are provided. [1] (A) an oily capsule having an average particle size of 100 μm or more comprising (A1) a solid oil component and (A2) a liquid oil component; (B) a fragrance complex comprising (B1) a surfactant with an HLB of 8.5 or more and (B2) a fragrance; An oil-in-water cosmetic comprising: [2] (B1) The cosmetic according to [1], wherein the blending amount of the surfactant is 0.01 to 0.45% by mass relative to the total amount of the cosmetic. [3] (B2) The cosmetic according to [1] or [2], wherein the blending amount of the fragrance is 0.001 to 0.5% by mass relative to the total amount of the cosmetic. [4] The cosmetic preparation according to any one of [1] to [3], wherein the mass ratio of the surfactant (B1) to the fragrance (B2) is 1:0.02 to 1:0.4. [5] The cosmetic preparation according to any one of [1] to [4], wherein the surfactant (B1) forms a solubilizing micelle that encapsulates the fragrance (B2). [6] The cosmetic according to any one of [1] to [5], wherein the average particle size of the fragrance complex is 500 nm or less. [7] (B1) The cosmetic preparation according to any one of [1] to [6], wherein the surfactant is a nonionic surfactant. [8] (B1) A cosmetic preparation according to any one of [1] to [7], wherein the surfactant is selected from the group consisting of polyether-modified silicone, POE-sorbitan fatty acid ester, POE sorbit fatty acid ester, POE-glycerin fatty acid ester, POE-fatty acid ester, POE-alkyl ether, Pluronic, POE·POP-alkyl ether, tetraPOE·tetraPOP-ethylenediamine condensate, POE-castor oil hydrogenated castor oil derivative, POE-beeswax·lanolin derivative, POE-propylene glycol fatty acid ester, alkylene oxide / ethylene oxide-dimer diol ether, POE-alkylamine, and POE-fatty acid amide. [9] A method for producing the oil-in-water cosmetic according to any one of [1] to [8], comprising the following steps: a step of introducing, under stirring at 10 to 1500 rpm, the (A1) solid oil component and the (A2) liquid oil component, which have been adjusted to a temperature above their melting points and made into a liquid state, into an aqueous solvent, which has also been adjusted to a temperature above their melting points, to form a mixture, and cooling the mixture to room temperature under stirring to form (A) oily capsules having an average particle size of 100 μm or more; (B1) a surfactant having an HLB of 8.5 or more and (B2) a fragrance are dissolved in a lower alcohol or a polyhydric alcohol, and the resulting solution is introduced into an aqueous solvent and stirred to form (B) a fragrance complex; and (A) a step of mixing an oil capsule and (B) a fragrance complex; The method comprising:

[0008] According to the present invention, it is possible to provide a cosmetic preparation containing oily capsules that has excellent fragrance and stability.

[0009] [Cosmetics] The present invention relates to an oil-in-water cosmetic comprising (A) oily capsules with an average particle size of 100 μm or more, which contain (A1) a solid oil and (A2) a liquid oil, and (B) a fragrance complex, which contains (B1) a surfactant with an HLB of 8.5 or more and (B2) a fragrance.

[0010] (A) Oil capsule The oil-in-water cosmetic preparation according to the present invention (hereinafter sometimes referred to as the cosmetic preparation) comprises oily capsules (hereinafter sometimes referred to as oily capsules or component (A); the same applies to other components) containing (A1) a solid oil component and (A2) a liquid oil component and having an average particle size of 100 μm or more. The oily capsules of the present invention are thought to have an (outer layer) capsule structure in which the inner layer containing the component (A2) is surrounded by the component (A1). Furthermore, the solid oil component that forms the outer layer crystallizes, giving the capsules an appropriate hardness and a unique feel when used. The average particle size of the oily capsules is 100 μm or more, preferably 100 μm to 1.5 mm, and more preferably 100 μm to 1 mm. The particle size of the oily capsules can be measured using a microscope. The blending amount of (A) oily capsules is preferably 0.5 to 10% by mass, more preferably 1 to 5% by mass, based on the total amount of the cosmetic.

[0011] (A1) Solid oil (A) The oil capsule contains (A1) a solid oil. In the present invention, "solid oil" means an oil that is solid or semi-solid at room temperature (25°C). Examples of (A1) solid oil components include solid paraffin, microcrystalline wax, ceresin, beeswax, varico wax, polyethylene wax, silicone wax, higher alcohols (e.g., behenyl alcohol, stearyl alcohol, cetyl alcohol, etc.), batyl alcohol, carnauba wax, beeswax, candelilla wax, jojoba wax, lanolin, shellac wax, spermaceti, Japan wax, higher fatty acids (e.g., myristic acid, palmitic acid, stearic acid, behenic acid, 12-hydroxystearic acid, etc.), ester oils (e.g., myristyl myristate, etc.), cocoa butter, hydrogenated castor oil, hydrogenated oils, hydrogenated palm oil, palm oil, hydrogenated coconut oil, polyethylene, petrolatum, various hydrogenated animal and vegetable oils and fats, and fatty acid monocarboxylic acid lanolin alcohol esters. From the viewpoint of stability at high temperatures, the melting point of the (A1) solid oil component is preferably 50° C. or higher, more preferably 55° C. or higher, and even more preferably 65° C. or higher. From the viewpoint of particle formability and dispersibility, the melting point is preferably 85° C. or lower. More preferred examples of the (A1) solid oil component include hydrogenated jojoba oil (melting point: 68°C), glyceryl behenate eicosandioate (melting point: 66°C), higher alcohols having 16 or more carbon atoms, preferably 18 or more carbon atoms, such as stearyl alcohol (melting point: 52 to 62°C) and behenyl alcohol (melting point: 68°C), microcrystalline wax (melting point: 80°C), ceresin (melting point: 68 to 75°C), polyethylene wax (melting point: 80°C), batyl alcohol (melting point: 70°C), carnauba wax (melting point: 83°C), candelilla wax (melting point: 71°C), hydrogenated castor oil (melting point: 84°C), stearic acid (melting point: 58 to 63°C), behenic acid (melting point: 69 to 80°C), and 12-hydroxystearic acid (melting point: 70°C).

[0012] The component (A1) can be blended in one or more types. The blending amount of the component (A1) in the composition of the present invention is preferably 5 to 50 mass% and more preferably 10 to 20 mass% based on the total amount of the component (A). By using this range, the stability of the oily capsule can be improved, and the oily capsule can have an appropriate hardness, improving usability such as skin compatibility.

[0013] (A2) Liquid oil (A) The oil capsule contains (A2) a liquid oil. In the present invention, "liquid oil" means an oil that is liquid at room temperature (25°C). (A2) Examples of liquid oils include: Flaxseed oil, camellia oil, macadamia nut oil, corn oil, olive oil, avocado oil, camellia oil, castor oil, safflower oil, apricot kernel oil, cinnamon oil, jojoba oil, grape oil, almond oil, rapeseed oil, sesame oil, sunflower oil, wheat germ oil, rice germ oil, rice bran oil, cottonseed oil, soybean oil, peanut oil, tea seed oil, evening primrose oil, triglycerin, glycerin trioctanoate, glycerin triisopalmitate, coconut oil, palm oil, palm kernel oil, etc. Octanoic acid esters such as cetyl octanoate, glycerin tri-2-ethylhexaenoate, isooctanoic acid esters such as pentaerythrityl tetraethylhexanoate ester oils such as lauric acid esters such as hexyl laurate, myristate esters such as isopropyl myristate and octyldodecyl myristate, palmitic acid esters such as octyl palmitate, stearic acid esters such as isocetyl stearate, isostearic acid esters such as isopropyl isostearate, isopalmitic acid esters such as octyl isopalmitate, oleic acid esters such as isodecyl oleate, adipic acid diesters such as diisopropyl adipate, sebacate diesters such as diethyl sebacate, and diisostearyl malate such as diisostearyl malate; Hydrocarbon oils such as liquid paraffin, ozokerite, squalane, squalene, pristane, paraffin, isoparaffin, and petrolatum; Examples of such silicone oils include chain silicones such as dimethylpolysiloxane (dimethicone), methylphenylpolysiloxane (phenylmethicone), and methylhydrogenpolysiloxane; cyclic silicones such as decamethylcyclopentasiloxane and dodecamethylcyclohexasiloxane; and silicone oils containing modified silicones such as amino-modified silicone oil, polyether-modified silicone oil, carboxy-modified silicone oil, alkyl-modified silicone oil, ammonium salt-modified silicone oil, and fluorine-modified silicone oil. Among these, polar oils such as glycerin tri-2-ethylhexaenoate and pentaerythrityl tetraethylhexanoate are preferred because they can impart a moist feeling to the skin in addition to the good skin-compatibility due to the presence of oil capsules. Silicone oil is also preferred because it can impart a moist feeling and smooth feeling to the skin in addition to the good skin-compatibility due to the presence of oil capsules.

[0014] The component (A2) can be blended in one or more types. The blending amount of the component (A2) in the composition of the present invention is preferably 50 to 95 mass% and more preferably 60 to 90 mass% based on the total amount of the component (A). By using this range, the stability of the oily capsule can be improved, and the oily capsule can have an appropriate hardness, improving usability such as skin compatibility.

[0015] In addition to the essential components (A1) and (A2), the oil capsule (A) may contain other components to the extent that the effects of the present invention are not impaired. Examples of other components that can be incorporated into the oil capsule include oil-soluble thickeners, moisturizers, oil-soluble drugs (e.g., oil-soluble vitamins, oil-soluble plant extracts, etc.), UV absorbers, chelating agents, pH adjusters, preservatives, pigments, dyes, surfactants, powder components, etc.

[0016] (B) Fragrance complex The cosmetic according to the present invention comprises a fragrance complex containing (B1) a surfactant having an HLB of 8.5 or more and (B2) a fragrance. It is preferred that the (B1) surfactant forms solubilizing micelles encapsulating the (B2) fragrance. The mass ratio of the (B1) surfactant to the (B2) fragrance is preferably 1:0.02 to 1:0.4, and more preferably 1:0.05 to 1:0.2. The average particle size of the fragrance complex is preferably 500 nm or less, more preferably 1 to 200 nm. The average particle size of the fragrance complex can be optically measured by dynamic light scattering or the like, assuming that the complex has a spherical shape.

[0017] (B1) Surfactants with an HLB of 8.5 or higher (B) The oil capsule comprises (B1) a surfactant having an HLB of 8.5 or more. The HLB (hydrophile-lipophile balance) value is preferably 8.5 to 19. In the present invention, the HLB value is preferably calculated by the Davis method. The component (B1) is preferably a nonionic surfactant.

[0018] The surfactant (B1) is preferably a polyether-modified silicone (e.g., PEG / PPG-30 / 10 dimethicone), a POE-sorbitan fatty acid ester (e.g., POE-sorbitan monooleate, POE-sorbitan monostearate, POE-sorbitan monooleate, POE-sorbitan tetraoleate, etc.), a POE sorbitan fatty acid ester (e.g., POE-sorbitan monolaurate, POE-sorbitan monooleate, POE-sorbitan pentaoleate, POE-sorbitan monostearate, etc.), a POE- Glycerin fatty acid esters (e.g., POE-monooleates such as POE-glycerin monostearate, POE-glycerin monoisostearate, and POE-glycerin triisostearate), POE-fatty acid esters (e.g., POE-distearate, POE-monodioleate, and ethylene glycol distearate), POE-alkyl ethers (e.g., POE-lauryl ether, POE-oleyl ether, POE-stearyl ether, POE-behenyl ether, POE-2-octyldodecyl ether, and POE-cholesterol), stanol ether, etc.), Pluronic, POE·POP-alkyl ethers (e.g., POE·POP-cetyl ether, POE·POP-2-decyltetradecyl ether, POE·POP-monobutyl ether, POE·POP-hydrogenated lanolin, POE·POP-glycerin ether, etc.), tetraPOE·tetraPOP-ethylenediamine condensates (e.g., Tetronic, etc.), POE-hydrogenated castor oil derivatives (e.g., POE-castor oil, POE-hydrogenated castor oil, POE-hydrogenated castor oil monoisostearate ... The POE-based copolymer is selected from the group consisting of POE-hydroxybenzoates, POE-hydroxybenzoates, POE-hydroxybenzoates (e.g., POE-hydroxybenzoates), ...The component (B1) is more preferably selected from the group consisting of polyether-modified silicone, POE-glycerin fatty acid ester, POE·POP-alkyl ether, POE-castor oil hydrogenated castor oil derivative, and alkylene oxide / ethylene oxide-dimer diol ether.

[0019] The component (B1) can be blended in one or more types. The blending amount of the component (B1) is preferably 0.01 to 0.45 mass% and more preferably 0.05 to 0.4 mass% relative to the total amount of the cosmetic. By keeping it in this range, stable oily capsules can be formed and stickiness after application can be suppressed.

[0020] (B2)Fragrance The (B) oil capsule contains (B2) a flavoring. The (B2) flavoring is not particularly limited and may be a natural flavoring or a synthetic flavoring.

[0021] Natural fragrances are fragrances whose main ingredient is a plant- or animal-derived component, and examples thereof include natural plant-derived fragrances such as rose oil, jasmine oil, neroli oil, lavender oil, ylang-ylang oil, tuberose oil, clary sage oil, clove oil, peppermint oil, geranium oil, patchouli oil, sandalwood oil, cinnamon oil, coriander oil, nutmeg oil, pepper oil, lemon oil, orange oil, bergamot oil, opoponax oil, vetiver oil, orris oil, and oakmoss oil; and natural animal-derived fragrances such as musk oil, civet oil, castoreum oil, and ambergris oil. Synthetic fragrances are sometimes classified into hydrocarbons, alcohols, aldehydes, ketones, esters, lactones, phenols, acetals, etc. based on their chemical structure or olfactory groups. Specific examples include limonene, β-caryophyllene (all hydrocarbons), cis-3-hexenol, linalool, farnesol, β-phenylethyl alcohol, geraniol, citronellol, terpineol, menthol, santalol, bagdanol, brahmanol (alcohols), 2,6-nonadienal, citral, α-hexylcinnamic aldehyde, l-carvone, cyclopentadecanone, lyral, lilial (aldehydes), β-ionone, damascone, methyl ionone, irino Examples of suitable hydroxybenzoates include benzoyl alcohol, iso-E super, acetyl cedrene, muscone (ketones), linalyl acetate, benzyl benzoate, benzyl acetate, methyl dihydroxyjasmonate, methyl jasmonate (esters), gamma-undecalactone, jasmine lactone, cyclopentadecanolide, ethylene brassylate (lactones), eugenol (phenols), phenylacetaldehyde dimethyl acetal (acetals), rose oxide, indole, and aurantiol.

[0022] The component (B2) can be blended in one or more types. The blend amount of component (B2) is preferably 0.001 to 0.5% by mass, and more preferably 0.001 to 0.2% by mass, relative to the total amount of the cosmetic.

[0023] The cosmetic preparation according to the present invention may contain other ingredients besides components (A) and (B) that are commonly used in cosmetics, provided that the ingredients do not impair the effects of the present invention. Examples of these ingredients include water-soluble thickeners, oil-soluble thickeners, moisturizers, water-soluble drugs (e.g., arbutin, ascorbic acid glucoside, tranexamic acid, 4-methoxysalicylate, etc.), UV absorbers, chelating agents, pH adjusters, preservatives, pigments, dyes, surfactants, powder components, etc.

[0024] Among the above components, it is preferable to incorporate a water-soluble thickener in order to further improve the stability of the dispersion. Examples of water-soluble thickeners include plant-based polymers such as gum arabic, tragacanth gum, galactan, carob gum, guar gum, karaya gum, carrageenan, pectin, agar, quince seed (quince), and algae colloid (brown algae extract), microbial polymers such as dextran, succinoglucan, pullulan, and xanthan gum, animal-based polymers such as collagen, casein, albumin, and gelatin, methylcellulose, nitrocellulose, ethylcellulose, methylhydroxypropylcellulose, hydroxyethylcellulose, sodium cellulose sulfate, hydroxypropylcellulose, sodium carboxymethylcellulose, crystalline cellulose, and cellulose powder. and the like; alginic acid polymers such as sodium alginate and propylene glycol alginate; vinyl polymers such as polyvinyl alcohol, polyvinyl methyl ether, polyvinylpyrrolidone, carboxyvinyl polymer, and alkyl-modified carboxyvinyl polymer; acrylic polymers such as polyoxyethylene polymers, polyoxyethylene-polyoxypropylene copolymer polymers, sodium polyacrylate, polyethyl acrylate, and polyacrylamide; and inorganic water-soluble polymers such as polyethyleneimine, cationic polymers, bentonite, aluminum magnesium silicate, laponite, hectorite, and silicic anhydride.

[0025] Among these water-soluble thickeners, alkyl-modified carboxyvinyl polymers are particularly suitable because they have surface activity and also have the effect of preventing the aggregation and coalescence of large particles. Alkyl-modified carboxyvinyl polymers are also called acrylic acid alkyl methacrylate copolymers, and are preferably (acrylates / C10-30 alkyl acrylate) crosspolymers. Commercially available (acrylates / C10-C30 alkyl acrylate) crosspolymers may be used, including "CARBOPOL 1342," "Pemulen TR-1 Polymeric Emulsifier," and "Pemulen TR-2 Polymeric Emulsifier" (manufactured by Lubrizol Advanced Materials, Inc.).

[0026] The cosmetic composition according to the present invention is suitable for use as a cosmetic base having a unique appearance and feel when used. Cosmetics using this base include, for example, aqueous cosmetics, gel cosmetics, emulsion cosmetics, etc. Specific uses include face, body, or hair cosmetics such as lotions, gels, emulsions, creams, and packs.

[0027] [Cosmetic manufacturing method] The method for producing a cosmetic according to the present invention comprises the following steps: a step of introducing, under stirring at 10 to 1500 rpm, the (A1) solid oil component and the (A2) liquid oil component, which have been adjusted to a temperature above their melting points and made into a liquid state, into an aqueous solvent, which has been adjusted to a temperature above their melting points, to form a mixture, and then cooling the mixture to room temperature while stirring, to form (A) oily capsules having an average particle size of 100 μm or more (hereinafter, this step may be referred to as an oily capsule forming step); (B1) a surfactant with an HLB of 8.5 or higher and (B2) a fragrance are dissolved in a lower alcohol or a polyhydric alcohol, and the resulting solution is introduced into an aqueous solvent and stirred to form a fragrance complex (hereinafter, this step may be referred to as a fragrance complex formation step); and (A) A step of mixing an oil capsule and (B) a fragrance complex (hereinafter sometimes referred to as a mixing step) The compound comprises: Each step will be described in detail below.

[0028] Oil capsule forming process Components (A1) and (A2) are each adjusted to a temperature above their melting points to form a liquid. These components are then introduced into an aqueous solvent adjusted to substantially the same temperature as the melting points while stirring. Stirring can be performed at a relatively slow speed, specifically 10 to 1500 rpm (preferably 20 to 300 rpm), using a propeller or paddle mixer. Introduction into the aqueous solvent can be performed, for example, using an injection means such as a liquid pump, preferably by direct injection from the bottom of the aqueous solvent. If this injection is performed from above, the oily component will immediately float and separate, making it difficult to form particles with a uniform particle size. In this way, by introducing the above components into the aqueous solvent under stirring, liquid particles can be formed in the aqueous solvent. Next, the mixture of the aqueous solvent and the above ingredients is further cooled to room temperature under stirring, and the solid oil, which has reached its melting point or below, precipitates on the particle surface, forming oil capsules with an average particle size of 100 μm or more in the aqueous solvent.

[0029] Fragrance complex formation process The components (B1) and (B2) are dissolved in a lower alcohol or a polyhydric alcohol. The resulting solution is introduced into an aqueous solvent and stirred. The stirring conditions are not particularly limited, but the mixture is generally stirred and mixed until it becomes visually transparent. The stirring speed is preferably 100 to 300 rpm. This allows the formation of a (B) fragrance complex. The order of the oil capsule forming step and the fragrance complex forming step is not particularly limited.

[0030] Mixing process (A) oil capsules and (B) fragrance complex are mixed. The oil capsules and fragrance complex are generally uniformly dispersed or dissolved in a medium, but a preferred embodiment is for them to be mixed in an aqueous solvent. The order of mixing is not particularly limited. The mixing temperature is a temperature at which the oil capsules and fragrance complex do not decompose, generally a temperature lower than the melting point of the (A1) solid oil, for example, room temperature. The stirring conditions during mixing are not particularly limited, but it is preferable to mix under conditions that do not destroy the oil capsules. [Example]

[0031] The present invention will be described in detail based on the following examples, but the present invention is not limited to these examples. Unless otherwise specified, the blending amounts are expressed in mass % based on the total amount.

[0032] [Example 1] A cosmetic composition of Example 1 was prepared according to the formulation shown in Table 1. Specifically, the aqueous solvent was first heated to 70°C, and while stirring at 250 rpm using a propeller mixer, components (A1) and (A2) melted at 70°C were injected into the aqueous solvent phase from below at a speed of 20 m / min using a liquid pump. After the injection was completed, the stirring speed was reduced to 150 rpm, and the mixture was cooled to room temperature. Potassium hydroxide was then added to form a composition containing oily capsules. Next, the components (B1) and (B2) were dissolved in ethanol, introduced into the aqueous solvent, and stirred at 200 rpm to form a composition containing a fragrance complex. Thereafter, the composition containing the oily capsules and the composition containing the fragrance complex were mixed to obtain the cosmetic of Example 1.

[0033] [Examples 2 to 7 and Comparative Example 2] The cosmetics of Examples 2 to 7 and Comparative Example 2 were prepared in the same manner as in Example 1, with the formulations shown in Table 1. [Comparative Example 1] The cosmetic of Comparative Example 1 was prepared in the same manner as in Example 1, except that oily capsules were formed by adding (B2) to components (A1) and (A2) in the formulation shown in Table 1. In Comparative Example 1, the fragrance was present inside the oily capsules. Comparative Example 3 Comparative Example 3 was prepared in the same manner as Example 1, except that (B2) was added to components (A1) and (A2) in the formulation shown in Table 1 to form oily capsules, and then only component (B1) was introduced into the aqueous solvent. In Comparative Example 3, the fragrance was present inside the oily capsules, and the surfactant (B1) was present outside the capsules, and no fragrance complex was formed. [Table 1]

[0034] [Oil capsule particle size] 3g of the cosmetic product prepared above was spread onto a 55mm diameter petri dish, and an image was taken with a digital camera along with a scale from above. The particle diameters of 50 representative particles were read from the scale and the average value was calculated. The average particle diameter of the obtained oil-based capsules was all between 100μm and 1.0mm.

[0035] [Fragrance complex particle size] The cosmetic compositions prepared above were diluted 1 / 10 with ion-exchanged water to prepare samples. These samples were observed using a Zetasizer NANO-ZS (manufactured by Sysmex Corporation) to measure particle size. The average particle size of the resulting fragrance complexes was all 50 nm or less.

[0036] [Scent evaluation] A fixed amount of each cosmetic material from each Example and Comparative Example was applied to the skin, and the strength of the fragrance immediately after application was evaluated according to the following criteria. The results are shown in Table 1. A: Strong B: Weak

[0037] [Stability evaluation] The cosmetic compositions of the Examples and Comparative Examples were stored at 25°C and 40°C for one month, and then the state of the oily capsules was observed. The evaluation criteria were as follows. The results obtained are shown in Table 1. A: No change in the state of the oil capsules was observed under any storage conditions. B: When stored at 40°C, aggregation and deformation were observed in less than 20% of the oil-based capsules. C: Only when stored at 40℃, aggregation and deformation were observed in 20% or more of the oil-based capsules.

[0038] The results in Table 1 show that cosmetics containing oily capsules and a fragrance complex containing a specific surfactant and fragrance have good fragrance release and excellent stability.

Claims

1. (A) an oily capsule having an average particle size of 100 μm or more, comprising (A1) a solid oil component and (A2) a liquid oil component; (B) a fragrance complex comprising (B1) a surfactant with an HLB of 8.5 or more and (B2) a fragrance; An oil-in-water cosmetic comprising: the blending amount of the (B2) fragrance is 0.001 to 0.5% by mass relative to the total amount of the cosmetic; the mass ratio of the (B1) surfactant to the (B2) fragrance is 1:0.02 to 1:0.4; A cosmetic, wherein the fragrance complex has an average particle size of 500 nm or less.

2. 2. The cosmetic according to claim 1, wherein the blending amount of the surfactant (B1) is 0.01 to 0.45% by mass relative to the total amount of the cosmetic.

3. 3. The cosmetic according to claim 1, wherein the surfactant (B1) forms a solubilizing micelle that encapsulates the fragrance (B2).

4. The cosmetic preparation according to any one of claims 1 to 3, wherein the surfactant (B1) is a nonionic surfactant.

5. The cosmetic preparation according to any one of claims 1 to 4, wherein the (B1) surfactant is selected from the group consisting of polyether-modified silicones, POE-sorbitan fatty acid esters, POE sorbit fatty acid esters, POE-glycerin fatty acid esters, POE-fatty acid esters, POE-alkyl ethers, Pluronic (registered trademark), POE-POP-alkyl ethers, tetraPOE-tetraPOP-ethylenediamine condensates, POE-castor oil hydrogenated castor oil derivatives, POE-beeswax-lanolin derivatives, POE-propylene glycol fatty acid esters, alkylene oxide / ethylene oxide-dimer diol ethers, POE-alkylamines, and POE-fatty acid amides.

6. A method for producing the oil-in-water cosmetic composition according to any one of claims 1 to 5, comprising the following steps: a step of introducing (A1) solid oil component and (A2) liquid oil component, which have been adjusted to a temperature above their melting points and made liquid, into an aqueous solvent, which has been adjusted to a temperature above their melting points, under stirring at 10 to 1500 rpm to form a mixture, and cooling the mixture to room temperature under stirring to form (A) oily capsules having an average particle size of 100 μm or more; (B1) a surfactant having an HLB of 8.5 or more and (B2) a fragrance are dissolved in a lower alcohol or a polyhydric alcohol, and the resulting solution is introduced into an aqueous solvent and stirred to form a (B) fragrance complex having an average particle size of 500 nm or less; and A step of mixing the (A) oil capsule and the (B) fragrance complex. comprising the blending amount of the (B2) fragrance is 0.001 to 0.5% by mass relative to the total amount of the cosmetic; The method, wherein the mass ratio of the (B1) surfactant to the (B2) fragrance is 1:0.02 to 1:0.4.

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