Cosmetic compositions including oil capsules

Abstract

A cosmetic composition is provided, comprising: an oil phase in the form of an oil capsule; and an aqueous phase, the oil phase comprising: a lipid component containing ceramides or derivatives thereof, cholesterol and fatty acids; an alcohol having 16 to 20 carbon atoms; and an oil thickener, the oil capsule having a transparent appearance.

Description

Technical Field

[0001] This invention relates to a cosmetic composition comprising oil capsules. Background Technology

[0002] Reports indicate that ceramides, cholesterol, or fatty acids, as major components of skin lipids, have multiple physiological functions, such as forming a skin barrier and protecting the skin from external stimuli, making them highly sought-after materials in cosmetics.

[0003] These skin lipid components, being poorly soluble, can lead to decreased formulation stability and precipitation issues when included in cosmetics. To address these problems, methods such as using excessive surfactants, employing specialized equipment for high-pressure emulsification, and encapsulation via spray drying have been developed.

[0004] However, using excessive surfactants can irritate the skin, and using specialized equipment can lead to cumbersome and uneconomical preparation methods. Furthermore, conventional encapsulation methods can result in a foreign body sensation and a heavy feel when applied to the skin, or a decrease in the cosmetic's aesthetic appeal. Summary of the Invention

[0005] Technical problems to be solved

[0006] In one embodiment, a cosmetic composition comprising oil capsules is provided that has a transparent appearance while maintaining a stable dosage form.

[0007] Problem Solving Methods

[0008] In one embodiment, a cosmetic composition is provided, comprising: an oil phase in the form of an oil capsule; and an aqueous phase, the oil phase comprising: lipid components such as ceramides or derivatives thereof, cholesterol and fatty acids; an alcohol having 16 to 20 carbon atoms; and an oil thickener, the oil capsule having a transparent appearance.

[0009] The oil capsules may have an average size of 0.1 mm to 1.5 mm.

[0010] The oil capsule may be spherical.

[0011] It may contain less than 20 parts by weight of the lipid component, based on 100 parts by weight of the alcohol having 16 to 20 carbon atoms.

[0012] It is possible that the alcohol having 16 to 20 carbon atoms is a branched alcohol.

[0013] The alcohol having 16 to 20 carbon atoms may include one or more of the following: hexyldecanol, octyldodecanol, heptyldecanol, octyldecanol, nonyldecanol, butyldodecanol, pentylundecanol, hexyldodecanol, heptyldodecanol, pentylundecanol, heptyldecanol, octylundecanol, and nonylundecanol.

[0014] It may contain 40 to 70 parts by weight of an alcohol having 16 to 20 carbon atoms, based on 100 parts by weight of the oil phase.

[0015] The oil thickener may include one or more of the following: triglyceride compounds, grafted polyolefins containing aliphatic groups of 14 or more, condensates of castor oil and alicyclic polyisocyanates, and condensates of polyol compounds and alicyclic polyisocyanates.

[0016] The oil thickener may include a mixture of triglyceride compounds, grafted polyolefins containing aliphatic groups of 14 or more, and condensates of castor oil and alicyclic polyisocyanates, or a mixture of triglyceride compounds, grafted polyolefins containing aliphatic groups of 14 or more, and condensates of polyol compounds and alicyclic polyisocyanates.

[0017] Yes, the oil thickener may have a cross-linked structure.

[0018] This can be achieved by the oil thickener having a weight-average molecular weight of 1000 g / mol or higher.

[0019] It may contain 5 to 30 parts by weight of the oil thickener, based on 100 parts by weight of the oil phase.

[0020] It may contain 1% to 9% by weight of the oil phase, based on the total weight of the cosmetic composition.

[0021] The aqueous phase may include a water-soluble thickener.

[0022] The water-soluble thickener may include one or more of acrylate thickeners and carbomer thickeners.

[0023] It may contain 0.05% to 1.0% by weight of the water-soluble thickener based on the total weight of the cosmetic composition.

[0024] Yes, the cosmetic composition may be an oil-in-water emulsion.

[0025] Alternatively, the cosmetic composition may not include surfactants.

[0026] The viscosity of the cosmetic composition may be between 500 cps and 10,000 cps.

[0027] Invention Effects

[0028] According to one embodiment, the cosmetic composition can stabilize lipid-containing components while providing visual differentiation and aesthetics through a transparent appearance.

[0029] Furthermore, the cosmetic composition according to one embodiment can reduce skin irritation caused by surfactants and provide an excellent user experience. Attached Figure Description

[0030] Figure 1 These are photographs showing the appearance of preparation examples 1-1, 1-2 and 1-5 to 1-8.

[0031] Figure 2 These are photographs showing the appearance of Preparation Example 2-1 and Preparation Example 2-6.

[0032] Figure 3 These are photographs showing the appearance of Example 1, Example 2 and Comparative Example 1.

[0033] Figure 4 This is a photograph showing the appearance of Embodiment 1. Detailed Implementation

[0034] Hereinafter, embodiments of the present disclosure will be described in detail to enable those skilled in the art to readily implement it. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein.

[0035] The terminology used in this specification is for illustrative purposes only and is not intended to limit the invention. Unless otherwise specified in the context, singular expressions include plural expressions.

[0036] In this specification, "combinations thereof" refers to mixtures, laminates, composites, copolymers, alloys, blends, reaction products, etc. of the constituents.

[0037] In this specification, "or" should not be interpreted as exclusive. For example, "A or B" should be interpreted as including A, B, A+B, etc.

[0038] The terms “comprising,” “possessing,” or “having” in this specification are intended to specify the presence of a feature, number, step, constituent element, or combination thereof implemented, without excluding the presence or additional possibility of one or more other features, numbers, steps, constituent elements, or combinations thereof.

[0039] In this instruction manual, "lipid components" refers to substances that are insoluble in water but soluble in oil, and can refer to substances that provide effects such as improving wrinkles, increasing elasticity, moisturizing, anti-oxidation, whitening, and fragrance.

[0040] In this specification, "oil capsule" refers to a carrier that, when mixed with water at room temperature and pressure, separates from the aqueous phase containing water, and contains lipid components internally, blocking or inhibiting the transfer of substances between the inside and outside of the capsule. The oil capsule may be described as an oil droplet or an oil droplet.

[0041] In this specification, "dispersion" of oil capsules means that the oil capsules do not aggregate, maintain their stable shape, and do not settle to the bottom of the composition, but are stably dispersed in the aqueous phase.

[0042] In this specification, "transparent" means that when observed through a medium (composition), its shape and color remain unchanged and it can be clearly seen. Furthermore, the term "transparent" should not be used interchangeably with "translucent" (a state where the shape and color of an object partially change when observed through a medium) or "opacity" (a state where the shape and color of an object are completely invisible when observed through a medium).

[0043] Capsules containing lipid components such as ceramides, cholesterol, or fatty acids can cause a foreign body sensation and a heavy feel when applied to the skin, or reduce the aesthetic appeal of cosmetics. Recently, while there have been attempts to develop cosmetics that stably contain these lipid components while maintaining excellent usability and aesthetics, no technology has yet been able to achieve high transparency in oil capsules containing these lipid components.

[0044] Therefore, the inventors, through years of research and numerous trials, have finally completed this invention, which can stably contain the lipid components while providing visual differentiation and aesthetics through a transparent appearance.

[0045] The following describes a cosmetic composition according to an implementation example.

[0046] A cosmetic composition according to one embodiment includes: an oil phase in the form of an oil capsule; and an aqueous phase, the oil phase comprising: lipid components of ceramide or derivatives thereof, cholesterol and fatty acids; an alcohol having 16 to 20 carbon atoms; and an oil thickener, the oil capsule having a transparent appearance.

[0047] Lipid components can form a skin barrier, protecting the skin from external irritants. A cosmetic composition according to one embodiment is characterized by excellent dosage form stability, where the lipid components are stably contained in the oil phase of an oil capsule, while significantly reducing lipid precipitation and other phenomena.

[0048] Ceramides or their derivatives contained in lipid components can repair damaged skin, protect the skin from external stimuli, and prevent skin moisture evaporation. For example, ceramide derivatives may include ceramide NP, ceramide NS, ceramide NH, ceramide AP, ceramide AS, ceramide EOP, ceramide EOS, or combinations thereof, but are not limited to these.

[0049] Based on 100 parts by weight of the oil phase, the ceramide may contain 0.1 to 10 parts by weight, 0.5 to 8 parts by weight, or 0.8 to 5 parts by weight. When the ceramide content meets the aforementioned range, a transparent oil capsule formulation can be achieved while ensuring the aforementioned effects of the ceramide, thereby improving dosage form stability.

[0050] Cholesterol in the lipid component can impart flexibility to the intercellular lipid layer of skin, enhance the stability of the skin barrier, and provide moisturizing effects to the skin. For example, based on 100 parts by weight of the oil phase, it can contain 0.5 to 13 parts by weight, 0.8 to 10 parts by weight, or 1 to 8 parts by weight of the cholesterol. When the cholesterol content meets the above range, the formulation stability can be improved while ensuring the aforementioned effects of cholesterol.

[0051] The fatty acids contained in lipid components can greatly reduce the evaporation of skin moisture, promote skin wound healing and regeneration, and maintain skin elasticity. For example, fatty acids can include palmitic acid, stearic acid, oleic acid, linoleic acid, alpha-linolenic acid, myristic acid, arachidonic acid, sebacic acid, or combinations thereof, but are not limited to these.

[0052] Based on 100 parts by weight of the oil phase, the product may contain 0.1 to 10 parts by weight, 0.5 to 8 parts by weight, or 0.8 to 5 parts by weight of the fatty acid. When the ceramide content meets the aforementioned range, a transparent dosage form of oil capsule can be achieved while ensuring the aforementioned effects of the fatty acid.

[0053] As an example, based on 100 parts by weight of an alcohol with 16 to 20 carbon atoms, the product may contain less than 20 parts by weight of lipid components, for example, less than 18 parts by weight, less than 16 parts by weight, or less than 15 parts by weight of lipid components, or more than 10 parts by weight, more than 10.5 parts by weight, or more than 11 parts by weight of lipid components. When the content of lipid components meets the aforementioned range, a transparent oil capsule formulation can be achieved while ensuring the formation of the skin barrier and skin protection effects. Most importantly, it can inhibit the precipitation of lipid components, thereby significantly improving the stability of the dosage form.

[0054] As an example, the oil phase may contain 0.5 to 20 parts by weight, 1 to 15 parts by weight, or 3 to 12 parts by weight of lipid components, based on 100 parts by weight. When the lipid content meets the aforementioned range, the formulation stability can be improved while ensuring the formation of the skin barrier and skin protection.

[0055] Alcohols with 16 to 20 carbon atoms can be used as solvents to create transparent oil capsules, significantly reducing lipid precipitation and improving dosage form stability. Specifically, when lipid components are formulated into capsules, it is difficult to simultaneously improve dosage form stability and achieve a transparent appearance in the oil capsules.

[0056] According to one example of a cosmetic composition, by controlling the type of alcohol used as a solvent, specifically the number of carbon atoms in the alcohol, it is possible to simultaneously improve dosage form stability and oil capsule transparency. For example, when the number of carbon atoms in the alcohol is less than 16 or greater than 20, lipid components may be separated, or the transparency of the oil capsule may decrease.

[0057] The alcohol having 16 to 20 carbon atoms can be a branched alcohol. In this case, dosage form stability and oil capsule transparency can be improved. For example, the alcohol having 16 to 20 carbon atoms may include one or more of hexyldecanol, octyldodecanol, heptyldecanol, octyldecanol, nonyldecanol, butyldodecanol, pentylundecanol, hexyldodecanol, heptyldodecanol, pentylundecanol, hexyllundecanol, heptyllundecanol, octylundecanol, and nonylundecanol. Specifically, the alcohols having 16 to 20 carbon atoms may include one or more of 2-hexyldecyl alcohol, 2-octyldodecyl alcohol, 2-heptyldecyl alcohol, 2-octyldecyl alcohol, 2-nonyldecyl alcohol, 2-butyldodecyl alcohol, 2-pentyldodecyl alcohol, 2-hexyldodecyl alcohol, 2-heptyldodecyl alcohol, 2-pentylundecyl alcohol, 2-hexylundecyl alcohol, 2-octylundecyl alcohol, and 2-nonylundecyl alcohol. More specifically, the alcohols having 16 to 20 carbon atoms may include one or more of hexyldecyl alcohol and octyldodecyl alcohol.

[0058] As an example, the alcohol having 16 to 20 carbon atoms can be a mixture of two or more branched alcohols that are different from each other. Compared to using a single branched alcohol having 16 to 20 carbon atoms, using a mixture of two or more branched alcohols having 16 to 20 carbon atoms can help further improve the transparency of the oil capsule.

[0059] Based on 100 parts by weight of the oil phase, it may contain 40 to 70 parts by weight of an alcohol having 16 to 20 carbon atoms, for example, 45 to 68 parts by weight, 50 to 66 parts by weight, or 55 to 65 parts by weight of an alcohol having 16 to 20 carbon atoms. When the content of alcohol having 16 to 20 carbon atoms meets the aforementioned range, the transparency of the oil capsule can be improved, and the dosage form stability can be greatly enhanced. Specifically, when the oil phase contains less than 40 parts by weight of the alcohol with 16 to 20 carbon atoms, based on 100 parts by weight of the oil phase, the relatively low content of the alcohol with 16 to 20 carbon atoms acting as a solvent may lead to problems with lipid composition analysis. When the oil phase contains more than 70 parts by weight of the alcohol with 16 to 20 carbon atoms (even if thickener is included), the viscosity of the oil phase will be significantly reduced, which may affect the stability of the dosage form. Moreover, poor dosage form stability may also have a negative impact on the transparency of the oil capsules.

[0060] Oil thickeners can appropriately control the viscosity of the oil phase, thereby greatly reducing the precipitation of lipid components and improving dosage form stability. Furthermore, oil thickeners can not only enable transparent oil capsules, but also further improve aesthetics by adjusting the particle size of the oil capsules.

[0061] According to one example of a cosmetic composition, by selecting the type of oil thickener, both improved dosage form stability and oil capsule transparency can be achieved simultaneously. For example, the oil thickener may include one or more of the following: triglyceride compounds, grafted polyolefins containing aliphatic groups of C14 or higher, condensates of castor oil and alicyclic polyisocyanates, and condensates of polyol compounds and alicyclic polyisocyanates. For example, the oil thickener may include one or more of the following, but is not limited to: caprylic / capric triglyceride, hydrogenated poly(C6-20 olefin), HDI / trimethylol hexyllactone crosspolymer, and castor oil / IPDI copolymer.

[0062] As an example, oil thickeners may include mixtures of triglyceride compounds, grafted polyolefins containing aliphatic groups of 14 or more, and condensates of castor oil and alicyclic polyisocyanates; or mixtures of triglyceride compounds, grafted polyolefins containing aliphatic groups of 14 or more, and condensates of polyol compounds and alicyclic polyisocyanates. For example, oil thickeners may include mixtures of caprylic / capric triglycerides, hydrogenated poly(C6-20 olefins), and HDI / trimethylolhexyl lactone crosspolymers; or mixtures of caprylic / capric triglycerides and castor oil / IPDI copolymers, but are not limited thereto.

[0063] As an example, oil thickeners can have a cross-linked structure. Here, "cross-linked structure" refers to a structure in which chemical bonds are formed between polymer chains, thereby constituting a three-dimensional network. The oil thickener used in the cosmetic composition according to an embodiment example, by having such a cross-linked structure, can have a very high weight-average molecular weight, for example, 1000 g / mol or more. For example, the weight-average molecular weight of the oil thickener can be less than 100,000 g / mol, but is not limited thereto. In particular, oil thickeners having such a cross-linked structure can have a more effective viscosity-modifying function compared to oil thickeners without such a cross-linked structure. That is, compounds without a cross-linked structure, such as dextrin palmitate, may not be suitable as oil thickeners in the cosmetic composition according to an embodiment example.

[0064] Based on 100 parts by weight of the oil phase, the product may contain 5 to 30 parts by weight of an oil thickener, for example, 7 to 25 parts by weight or 10 to 20 parts by weight of an oil thickener. When the content of the oil thickener meets the aforementioned range, the lipid composition can be effectively stabilized, while simultaneously ensuring the transparency and dosage form stability of the oil capsule.

[0065] As an example, the oil phase may also include oil. The oil may include one or more of the following: triglyceride oils, hydrocarbon oils, ester oils, diester oils, and silicone oils.

[0066] The triglyceride oil may include one or more of the following: caprylic / capric / stearic triglyceride, triethylhexanoin, and tricaprylin.

[0067] The hydrocarbon oil may include one or more of the following: squalene, hydrogenated polyisobutene, hydrogenated poly(C6-20 olefin), hydrogenated polydecene, paraffin, cereusin, and microcrystalline wax.

[0068] The ester oils may include one or more of the following: cetyl ethylhexanoate, octyldodecyl myristate, isopropyl palmitate, isopropyl myristate, tocopheryl acetate, butylene glycol dicaprylate / dicaprate, coconut-caprylate / caprate, Simmondsia Chinensis (Jojoba) seed oil, dicaprylyl carbonate, pentaerythrityl tetraethylhexanoate, and pentaerythrityl tetraisostearate.

[0069] The diester oil may include one or more of the following: diisostearyl malate, DI-C12-13 alkyl malate, neoopentyl glycol diheptanoate, tridecyl stearate, neoopentyl glycol dicaprylate / dicaprate, tridecyl trimellitate, and dicaprylyl carbonate.

[0070] The silicone oil may include one or more of the following: dimethyl silicone oil, cyclomethyl silicone oil, poly(dimethylsiloxane) (PDMS), poly(methylphenyl)siloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclopentasiloxane, tetradecamethylhexasiloxane, and octamethyltrisiloxane.

[0071] The oil phase is in the form of oil capsules, which have a transparent appearance. For example, transparency can refer to a transmittance of 70% or more in the visible light region (wavelength 600nm) in a 1cm × 1cm quartz cell using a UV-VIS spectrophotometer; specifically, it could be 75% or more, 80% or more, or 99.9% or less, 99.5% or less, or 99% or less. These oil capsules are dispersed in the aqueous phase, and their transparent appearance provides visual distinctiveness and aesthetic appeal.

[0072] The average size of the oil capsules can be from 0.1 mm to 1.5 mm, for example, from 0.15 mm to 1.45 mm, 0.2 mm to 1.4 mm, or 0.3 mm to 1.3 mm. When the average size of the oil capsules meets these ranges, the transparency of the oil capsules is improved, and they can be uniformly and stably dispersed in the aqueous phase, thus providing visual difference and aesthetics. The average size of the oil capsules can be measured by taking photographs of the oil capsules using an electron microscope. For example, the average size of the oil capsules can be determined by selecting any 20 or more particles in the electron microscope image, measuring their particle size (diameter, major axis, or major axis length), and then taking the average value. A transmission electron microscope or a scanning electron microscope can be used.

[0073] Oil capsules can be spherical. "Spherical" here refers not only to a perfectly smooth sphere but also to a polyhedron that approximates a perfect sphere. By achieving a transparent appearance while maintaining a spherical shape, oil capsules offer superior visual contrast and aesthetics.

[0074] As an example, the sphericity of the oil capsule can be 0.7 or higher, 0.75 or higher, 0.8 or higher, or 0.85 or higher, and can be 1.0 or lower, 0.98 or lower, or 0.95 or lower. When the sphericity of the oil capsule meets the above ranges, it means that the shape of the oil capsule is close to that of a sphere, thus further improving visual distinctiveness and aesthetics. The sphericity of the oil capsule can be measured by taking photographs of the oil capsule using an electron microscope. For example, the ratio (r / R) of the oil capsule's particle size (diameter, major axis, or major axis length, r) to the diameter (R) of a circle having the same area as the projected area of ​​the oil capsule can be taken as the sphericity of the oil capsule.

[0075] The cosmetic composition may contain 1% to 9% by weight of an oil phase relative to its total weight, for example, 1% to 8.5% or 2% to 8% by weight. When the oil phase content meets these ranges, the oil capsules exhibit increased transparency and are uniformly and stably dispersed in the aqueous phase, thus providing superior visual contrast and aesthetics. Specifically, as the oil phase content (by weight) increases, the viscosity of the cosmetic composition including the oil phase increases, resulting in a smaller average size (average particle size) of the oil capsules within the cosmetic composition, which can contribute to excellent aesthetics. However, when the oil phase content is less than 1% by weight relative to the total amount of the cosmetic composition, the distribution rate of the oil capsules decreases, which may reduce aesthetics. When the oil phase content is greater than 9% by weight relative to the total amount of the cosmetic composition, aggregation or clumping between oil capsules may occur (the liquid film between oil capsules ruptures, causing adjacent oil capsules to merge and form larger oil capsules), or the sphericity or transparency of the oil capsules may decrease, which may also be a major cause of impaired aesthetics.

[0076] The aqueous phase may include a water-soluble thickener. The water-soluble thickener can control the viscosity of the aqueous phase, thereby enabling the oil phase of the oil capsule to be stably dispersed, and can further improve the aesthetics by adjusting the transparency or particle size of the oil capsule.

[0077] Water-soluble thickeners may include one or more of acrylate thickeners and carbomer thickeners.

[0078] The acrylate thickener may include one or more of the following: acrylate / C10-30 alkyl acrylate crosspolymer, ammonium acryloyldimethyltaurate / beheneth-25 methacrylate crosspolymer, acrylate / palmeth-25 acrylate copolymer, acrylate / beheneth-25 methacrylate copolymer, polyacrylate crosspolymer-6, and sodium polyacrylate.

[0079] The carbomer thickener, as a cross-linked acrylic polymer, refers to a polymer having a non-cyclic aliphatic hydrocarbon backbone. For example, the carbomer thickener may include carbomer, which is marketed under the CARBOPOL® trademark of Lubrizol Corporation. Examples of carbomers available from Lubrizol include CARBOPOL 934, 940, 941, 980, 981, 1342, 2984, 5984, SILK 100, ETD 2020, 2050, ULTREZ 10, or ULTREZ 30. However, it is not limited to these; for example, a carbomer thickener may also be a substance in which basic substances such as triethylamine, potassium hydroxide, or sodium hydroxide are added to cross-link the carbomer.

[0080] Water-soluble thickeners may also include one or more of cellulose-based thickeners and polysaccharide thickeners.

[0081] The cellulose-based thickener may include one or more of hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropyl methylcellulose, methyl cellulose, ethyl cellulose, and carboxymethyl cellulose.

[0082] The polysaccharide thickener may include one or more of the following: agar, xanthan gum, gellan gum, cellulose gum, tara gum, sclerotium gum, guar gum, carrageenan, and alginic acid.

[0083] The cosmetic composition may contain 0.05% to 1.0% by weight of a water-soluble thickener relative to its total weight, or 0.05% to 0.8%, 0.1% to 0.5%, or 0.2% to 0.4% by weight of a water-soluble thickener. When the content of the water-soluble thickener meets the aforementioned range, the aesthetics can be further improved by adjusting the transparency and particle size of the oil capsules while ensuring dosage form stability. By controlling the content of the water-soluble thickener as described above, the viscosity of the cosmetic composition can be appropriately maintained, thereby facilitating the maintenance of the average size (particle size) of the oil capsules within the cosmetic composition at 0.1 mm to 1.5 mm.

[0084] Cosmetic compositions can be oil-in-water emulsions. "Oil-in-water (O / W)" refers to a dosage form where the continuous phase is aqueous and the dispersed phase is an oil phase in capsule form, meaning a macroscopically homogeneous dosage form. While stably maintaining the shape of oil capsules, the oil phase portion of the cosmetic composition does not settle to the bottom of the composition but is stably dispersed in the aqueous phase, thus providing excellent visual distinctiveness and aesthetics.

[0085] Cosmetic compositions may not include surfactants. Here, "not including" surfactants means that the content of said surfactants is substantially non-existent relative to the total amount of the cosmetic composition. Furthermore, "substantially non-existent" can mean that the content of said surfactants, relative to the total weight of the cosmetic composition, is less than 1.0% by weight, less than 0.1%, less than 0.01%, or less than 0.001%, or completely non-existent, but is not limited to these.

[0086] The viscosity of the cosmetic composition can range from 500 cps to 10000 cps, for example, 700 cps to 9000 cps, 1000 cps to 8000 cps, or 1500 cps to 6000 cps. When the viscosity of the cosmetic composition meets the above range, the transparency and particle size of the oil capsules can be appropriately controlled while ensuring the dosage form stability of the oil capsules, thereby further improving aesthetics. When the viscosity of the cosmetic composition is less than 500 cps, the oil capsules cannot be evenly distributed and instead float on the top of the composition, which may reduce aesthetics. In addition, when the viscosity of the cosmetic composition is greater than 10000 cps, the particle size of the oil capsules becomes smaller and the transparency of the oil capsules decreases, thus becoming a factor that detracts from aesthetics. The viscosity of the cosmetic composition can be measured at room temperature (23°C) using a Brookfield viscometer.

[0087] Cosmetic compositions can have a transparent appearance. Specifically, since the oil phase of an oil capsule has a transparent appearance, cosmetic compositions including the oil phase can also have a transparent appearance, thereby providing visual differentiation and aesthetics. For example, transparency can refer to a transmittance of 70% or more in the visible light region (wavelength 600nm) in a 1cm × 1cm quartz cell using a UV-VIS spectrophotometer, such as 75% or more, 80% or more, or 99.9% or less, 99.5% or less, or 99% or less.

[0088] As an example, without prejudice to the purpose of the invention, the cosmetic composition may include additional additives in addition to the stated ingredients. For example, the additives are not limited to conventional ingredients and may include one or more of the following: solvents, concentrates, emollients, antioxidants, stabilizers, foaming agents, fragrances, fillers, metal ion blocking agents, chelating agents, preservatives, vitamins, skin protectants, wetting agents, dyes, and pigments.

[0089] Hereinafter, embodiments and comparative examples of the present invention will be described. The following embodiments are merely examples of the present invention, and the present invention is not limited to the following embodiments.

[0090] Preparation Example 1: Preparation of a mixture of lipid components and alcohol (solvent)

[0091] The raw materials listed in Table 1 (unit: weight ratio) are stirred and heated to dissolve at 100°C to prepare a mixture of lipid components and alcohol (solvent).

[0092] Table 1

[0093]

[0094] Preparation Example 2: Preparation of the oil phase

[0095] The raw materials listed in Table 2 (unit: weight %) are stirred and heated to dissolve at 100°C to prepare the oil phase.

[0096] Table 2

[0097]

[0098] Preparation Example 3: Preparation of Cosmetic Compositions

[0099] The aqueous phase raw materials listed in Table 3 (unit: weight %) were dissolved by stirring and heating at 70 to 80°C. Then, the oil phase was added to the aqueous phase and stirred to prepare an oil capsule-like composition. The mixture was then cooled at 40°C and a pH adjuster was added to prepare a cosmetic composition.

[0100] Table 3

[0101]

[0102] Experimental Example 1: Evaluation of the dosage form stability and transparency of Preparation Example 1

[0103] The dosage form stability and transparency of Preparation Example 1 were evaluated, as shown in Table 4 below. Figure 1 The result is shown in the figure.

[0104] (1) Evaluation of dosage form stability

[0105] After preparing each sample, observe with the naked eye one month later whether lipid components have precipitated, and... Figure 1 The image shows a photograph of the sample one month later.

[0106] (2) Transparency of oil capsules

[0107] Oil capsules dispersed in the aqueous phase were identified by visual inspection, and transparency was evaluated using the following methods.

[0108] ○: The shape and color of the oil capsules remained unchanged, and the visible condition was normal.

[0109] △: Oil capsules are very small in size, or the oil capsules are clustered together, resulting in a cloudy appearance.

[0110] ×: This indicates that lipid components have precipitated, causing changes in the shape and color of the oil capsule.

[0111] Table 4

[0112]

[0113] Refer to Table 4 and Figure 1It can be confirmed that in the cases of preparation examples 1-1 to 1-4, no lipid components were precipitated after 1 month of preparation, the dosage form remained stable, and the oil capsules exhibited a transparent appearance.

[0114] On the one hand, it was confirmed that in preparation examples 1-5 using alcohols with more than 20 carbon atoms as solvents and preparation examples 1-6 and 1-7 including the use of conventional solvents instead of alcohols, the dosage form stability decreased, such as lipid composition separation, and the oil capsules exhibited an opaque appearance.

[0115] Furthermore, it was confirmed that in preparation examples 1-8 where the content of the lipid component relative to the solvent was adjusted to be very high, the dosage form stability decreased, such as lipid component separation, and the oil capsules exhibited an opaque appearance.

[0116] Then, it was confirmed that in Preparation Examples 1-9, where the content of lipid components relative to the solvent was adjusted to be very low, although no lipid components were precipitated, the oil capsules exhibited a cloudy appearance. Furthermore, as described later, it was confirmed that in the case of the oil phase (Preparation Examples 2-5) prepared by stirring Preparation Examples 1-9 together with an oil thickener, the thickening ability of the oil thickener was weakened, resulting in a very small particle size and decreased transparency of the oil capsules.

[0117] Experimental Example 2: Evaluation of the dosage form stability and transparency of Preparation Example 2

[0118] The dosage form stability and transparency of Preparation Example 2 were evaluated, as shown in Table 5 below. Figure 2 The results are shown in the figure. The specific evaluation method is the same as that in Experiment 1.

[0119] Table 5

[0120]

[0121] Refer to Table 5 and Figure 2 It can be confirmed that in the cases of preparation examples 2-1 to 2-4, no lipid components were precipitated after 1 month of preparation, the dosage form remained stable, and the oil capsules exhibited a transparent appearance.

[0122] On the one hand, in the case of preparation examples 2-5, as the oil phase prepared by stirring with an oil thickener in preparation examples 1-9 where the content of the lipid component relative to the solvent was adjusted to be very low, the thickening ability of the oil thickener was weakened, resulting in the formation of oil capsules of very small size, thereby causing the transparency of the oil capsules to decrease.

[0123] It was confirmed that in preparation examples 2-6, 2-9, and 2-10 using dextrin palmitate as an oil thickener, a decrease in dosage form stability and transparency, such as lipid composition separation, occurred. That is, it can be understood that transparency may decrease depending on the compatibility with oil thickeners having cross-linked structures, thus confirming that the type of oil thickener is also a very important factor in dosage form stability and transparency.

[0124] Furthermore, it was confirmed that in Preparation Examples 2-7, where the oil thickener content was adjusted to a very low level, very small oil capsules were formed, resulting in a cloudy appearance. In Preparation Examples 2-8, where the oil thickener content was adjusted to a very high level, the oil capsules also aggregated, forming irregularly sized oil capsules, which also resulted in a cloudy appearance and reduced aesthetics.

[0125] Experimental Example 3: Evaluation of the dosage form stability and transparency of Preparation Example 3

[0126] The dosage form stability and transparency of Preparation Example 3 were evaluated, as shown in Table 6 below. Figure 3 The results are shown in the figure. The specific evaluation method is the same as that in Experiment 1.

[0127] Table 6

[0128]

[0129] Refer to Table 6 and Figure 3 It can be confirmed that in the cases of Examples 1 to 4, no lipid components were precipitated after one month of preparation, the dosage form remained stable, the oil capsules had a transparent appearance, and the transparency of the cosmetic composition was also excellent.

[0130] On the one hand, in the case of Comparative Example 1, including Preparation Examples 2-6 (using dextrin palmitate as an oil thickener), there was a decrease in dosage form stability such as lipid component separation, and the oil capsules appeared cloudy, resulting in the cosmetic composition being opaque and thus reducing aesthetics.

[0131] Furthermore, in Reference Example 1, where the oil phase content was adjusted to a very low level, the dosage form stability was poor, and the oil capsule content in the cosmetic composition was very low, making it difficult to assess the transparency of the oil capsules. In addition, Reference Example 2, where the oil phase content was adjusted to a very high level, also exhibited poor dosage form stability, with oil capsules agglomerating, resulting in poor transparency of both the oil capsules and the cosmetic composition.

[0132] In Reference Example 3, where the content of the acrylate / C10-30 alkanol acrylate crosspolymer was adjusted to be low as a water-soluble thickener, the formulation stability was poor, and the viscosity of the aqueous phase was very low, causing oil capsules to float on top of the cosmetic composition, making it difficult to assess the transparency of the oil capsules. Furthermore, Reference Example 4, where the content of the water-soluble thickener was adjusted to be high, also showed decreased formulation stability due to lipid component separation, and the viscosity of the aqueous phase was very high, resulting in the formation of oil capsules in very fine sizes, thereby reducing the transparency of the cosmetic composition.

[0133] Experimental Example 4: Measurement of viscosity and average size of oil capsules of cosmetic compositions

[0134] The viscosity, oil capsule transparency, and average size of the cosmetic composition of Preparation Example 3 were measured, and the results are shown in Table 7 below. The specific measurement methods are as follows.

[0135] (1) Viscosity of cosmetic composition

[0136] The composition was placed at room temperature (23°C) using a Brookfield RVDV-III viscometer with a Spindle #3 rotor, and the viscosity was measured at 12 rpm for 2 minutes.

[0137] (2) Particle size of oil capsules

[0138] After acquiring electron microscope images of the oil capsules, select any 20 or more particles from the images, measure their long axis length, and then calculate their average value.

[0139] Table 7

[0140]

[0141] Referring to Table 7, in Examples 1 to 4, the viscosity was between 2000 cps and 6000 cps, and the particle size of the oil capsules was shown to be between 0.4 mm and 0.8 mm.

[0142] Taking the examples as an example, Figure 4 A photograph showing the appearance of Embodiment 1 is provided. (Reference) Figure 4 It was confirmed that in the case of Example 1, the oil capsules had a transparent appearance, thus the cosmetic composition had excellent transparency, and the oil capsules of uniform size were evenly distributed, thus having visual distinctiveness and aesthetic appeal.

[0143] On the one hand, in Reference Example 1, the content of oil capsules in the cosmetic composition was very low, making it difficult to measure the particle size of the oil capsules. Furthermore, in Reference Example 2, the particle size variation between oil capsules was very significant, making it difficult to measure the average particle size.

[0144] In Reference Example 3, the viscosity of the aqueous phase was very low, making it impossible to measure the viscosity of the cosmetic composition, and the oil capsules aggregated together, making it difficult to measure the particle size of the oil capsules. Furthermore, in Reference Example 4, the viscosity of the cosmetic composition was very high, resulting in the formation of oil capsules with very small particle sizes.

[0145] Experiment Example 5: Sensory Evaluation

[0146] The cosmetic composition of Preparation Example 3 was evaluated for its usability and aesthetic appearance, and the results are shown in Table 6 below. The specific measurement methods are as follows.

[0147] The specific evaluation method is as follows: Ten group members used the cosmetic composition for one week. After one week of use, the user experience and aesthetic appeal were evaluated on a 7-point scale. Regarding user experience, the less foreign body sensation and the lighter the feel, the higher the score. Furthermore, regarding aesthetics, the more noticeable the visual difference and aesthetic appeal compared to ordinary cosmetics, the higher the score.

[0148] Table 8

[0149]

[0150] Referring to Table 8, in the cases of Examples 1 to 4, the user experience and aesthetic appearance were rated as excellent. In particular, referring to... Figure 3 and Figure 4 It can be confirmed that, in the case of the embodiments, the oil capsules have a transparent appearance, thereby providing visual differentiation and aesthetics.

[0151] On the one hand, in the cases of Comparative Example 1 and Reference Examples 1 to 4, the usability and aesthetics were rated as poor. In particular, Reference Examples 1 to 4... Figure 3 It can be confirmed that in the case of the comparative example, the oil capsule has an opaque appearance, and therefore its aesthetics are also rated as poor.

[0152] The preferred embodiments have been described in detail above, but the scope of the present invention is not limited thereto. Various modifications and improvements made by those skilled in the art based on the basic concepts defined in the appended claims also fall within the scope of the present invention.

Claims

1. A cosmetic composition comprising: The oil phase of an oil capsule; and Aqueous phase, The oil phase includes: Lipid components containing ceramides or their derivatives, cholesterol, and fatty acids; Alcohols with 16 to 20 carbon atoms; and Oil thickener The oil capsule has a transparent appearance.

2. The cosmetic composition according to claim 1, wherein, The average size of the oil capsules is 0.1 mm to 1.5 mm.

3. The cosmetic composition according to claim 1, wherein, The oil capsule is spherical.

4. The cosmetic composition according to claim 1, wherein, Based on 100 parts by weight of the alcohol having 16 to 20 carbon atoms, it contains less than 20 parts by weight of the lipid component.

5. The cosmetic composition according to claim 1, wherein, The alcohols with 16 to 20 carbon atoms are branched alcohols.

6. The cosmetic composition according to claim 5, wherein, The alcohols having 16 to 20 carbon atoms include one or more of hexyldecyl alcohol, octyldodecyl alcohol, heptyldecyl alcohol, octyldecyl alcohol, nonyldecyl alcohol, butyldodecyl alcohol, pentyldodecyl alcohol, hexyldodecyl alcohol, heptyldodecyl alcohol, pentylundecanol, hexylundecanol, heptylundecanol, octylundecanol, and nonylundecanol.

7. The cosmetic composition according to claim 1, wherein, Based on 100 parts by weight of the oil phase, it contains 40 to 70 parts by weight of the alcohol having 16 to 20 carbon atoms.

8. The cosmetic composition according to claim 1, wherein, The oil thickener comprises one or more of the following: triglyceride compounds, grafted polyolefins containing aliphatic groups of 14 or more, condensates of castor oil and alicyclic polyisocyanates, and condensates of polyol compounds and alicyclic polyisocyanates.

9. The cosmetic composition according to claim 8, wherein, The oil thickener includes a mixture of triglyceride compounds, grafted polyolefins containing aliphatic groups of 14 or more, and condensates of castor oil and alicyclic polyisocyanates, or a mixture of triglyceride compounds, grafted polyolefins containing aliphatic groups of 14 or more, and condensates of polyol compounds and alicyclic polyisocyanates.

10. The cosmetic composition according to claim 1, wherein, The oil thickener has a cross-linked structure.

11. The cosmetic composition according to claim 1, wherein, The weight-average molecular weight of the oil thickener is above 1000 g / mol.

12. The cosmetic composition according to claim 1, wherein, Based on 100 parts by weight of the oil phase, it contains 5 to 30 parts by weight of the oil thickener.

13. The cosmetic composition according to claim 1, wherein, Based on the total weight of the cosmetic composition, it contains 1% to 9% by weight of the oil phase.

14. The cosmetic composition according to claim 1, wherein, The aqueous phase includes a water-soluble thickener.

15. The cosmetic composition according to claim 14, wherein, The water-soluble thickener includes one or more of acrylate thickeners and carbomer thickeners.

16. The cosmetic composition according to claim 14, wherein, Based on the total weight of the cosmetic composition, it contains 0.05% to 1.0% by weight of the water-soluble thickener.

17. The cosmetic composition according to claim 1, wherein, The cosmetic composition is an oil-in-water emulsion.

18. The cosmetic composition according to claim 1, wherein, The cosmetic composition does not include surfactants.

19. The cosmetic composition according to claim 1, wherein, The viscosity of the cosmetic composition is from 500 cps to 10000 cps.

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