Multi-layer ombre cosmetic composition and lip and cheek product comprising the same

Abstract

A multilayer cosmetic composition according to one embodiment of the present invention is a multilayer cosmetic composition that is laminated and filled in a container to form a plurality of visually distinguishable layers, comprising a lower layer, a middle layer, and an upper layer, wherein each of the lower layer, the middle layer, and the upper layer comprises an oil-phase gel matrix comprising a non-volatile oil-phase base, an oil-phase gelling agent, and a volatile solvent, and one or more of a coloring component and an optical control component dispersed within the oil-phase gel matrix, wherein the composition of the oil-phase gel matrix of the lower layer, the middle layer, and the upper layer is substantially the same, and the type or content of one or more of the coloring component and the optical control component differs from layer to layer, so that each layer exhibits a different color, brightness, or saturation, and the oil-phase gelling agent forms a gel network within the oil-phase gel matrix to suppress the flow of each layer, thereby preventing interlayer mixing.

Description

Technology Field

[0001] The present invention relates to the field of cosmetic formulation and container technology.

[0002] More specifically, the invention relates to a multilayer cosmetic composition that prevents interlayer mixing by forming multiple layers with different coloring and optical control components based on the same anhydrous oil-phase gel matrix base, and to a lip and cheek product containing the same, which can achieve a natural gradient (ombre) color with only a single product. Background Technology

[0004] In recent makeup trends, gradient or tone-on-tone makeup that gives a natural look to the lips or cheeks is gaining popularity. However, most existing lip or cheek products currently on the market are produced with single-color fillings, giving a visually simple impression and lacking design differentiation from other products.

[0005] In order for a user to create a gradient effect, they had to have two or more different cosmetics, such as a base color and an accent color, and there was the inconvenience of having to apply them over or blend the edges by rubbing with their hands. During this process, hands or tip tools could become contaminated, and there was a limitation in that it was difficult for general users without delicate makeup techniques to obtain uniform and beautiful color results.

[0006] In the case of formulations claiming a layered structure, most are oil / water separation formulations utilizing the repulsion between the oil phase and the water phase, but since they must be shaken and mixed before use, it is difficult to take out the contents while maintaining the original layered design, and there was a problem with uneven color development when applied to the lips. The problem to be solved

[0008] The present invention aims to provide a multilayer cosmetic composition in which multiple contents having different colors, brightness, and saturation are layered and filled, thereby preventing interlayer mixing at its source, so that a natural gradient (ombre) expression is possible with only a single product.

[0009] In addition, the present invention aims to provide a lip and cheek product that allows for easy control of color intensity and mood when applied to the lips or cheeks by penetrating a coating member through a three-layered stacked contents to take the contents at once, and enables uniform makeup results without the need for additional products or delicate techniques.

[0010] The present invention aims to implement an anhydrous oil gel-based matrix structure in which each layer is fixed so as not to flow within the product, thereby stably maintaining the distinctive appearance and premium image of the product even during long-term storage and improving design competitiveness. means of solving the problem

[0012] A multilayer cosmetic composition according to one embodiment of the present invention is a multilayer cosmetic composition that is laminated and filled in a container to form a plurality of visually distinguishable layers, comprising a lower layer, a middle layer, and an upper layer, wherein each of the lower layer, the middle layer, and the upper layer comprises an oil-phase gel matrix comprising a non-volatile oil-phase base, an oil-phase gelling agent, and a volatile solvent, and one or more of a coloring component and an optical control component dispersed within the oil-phase gel matrix, wherein the composition of the oil-phase gel matrix of the lower layer, the middle layer, and the upper layer is substantially the same, and the type or content of one or more of the coloring component and the optical control component differs from layer to layer, so that each layer exhibits a different color, brightness, or saturation, and the oil-phase gelling agent forms a gel network within the oil-phase gel matrix to suppress the flow of each layer, thereby preventing interlayer mixing.

[0013] The non-volatile oil phase base comprises hydrogenated poly(C6-14 olefin) and is included in an amount of 60 to 80 weight% based on the total weight of the composition, and the oil phase gelling agent comprises hydrogenated styrene / isoprene copolymer and is included in an amount of 3 to 10 weight% based on the total weight of the composition to form a gel network by physical crosslinking within the non-volatile oil phase base, thereby imparting yield stress to each layer to suppress interlayer flow mixing caused by self-weight and external impact, and the volatile solvent comprises isododecane and is included in an amount of 2 to 8 weight% based on the total weight of the composition to temporarily reduce the viscosity of the oil phase gel matrix during filling and harden the surface of each layer by volatilization after filling, and the oil phase gel matrix is ​​configured to further include polyglyceryl-2 triisostearate as an oil phase dispersant in an amount of 5 to 15 weight% based on the total weight of the composition to uniformly disperse coloring components and optical control components within the oil phase base and to suppress sedimentation of pigment particles and interlayer color shift. It is possible.

[0014] The coloring component comprises one or more of inorganic pigments, organic pigments, and dyes, the inorganic pigment comprises one or more of red iron oxide, yellow iron oxide, and black iron oxide and is fixed within an oil gel matrix in a particle-dispersed form to suppress interlayer migration, the organic pigment comprises one or more lake pigments of Red 201, Red 202, and Red 104 (1), the dye comprises one or more of Yellow 4, Yellow 5, and Blue 1, the optical control component comprises one or more of titanium dioxide that performs brightness control and opacity, and synthetic fluorophlogopite that imparts light reflection and pearl effect, the layer exhibiting a relatively bright color among the lower layer, middle layer, and upper layer has a titanium dioxide content of 0.5% by weight or more based on the weight of the layer and a combined content of inorganic pigments and organic pigments of less than 0.5% by weight based on the weight of the layer, and the layer exhibiting a relatively dark color has a titanium dioxide content of less than 0.5% by weight based on the weight of the layer and a combined content of inorganic pigments and organic pigments It can be configured so that the content is 0.5 weight% or more based on the weight of the layer.

[0015] The lower, middle, and upper layers are manufactured by dividing from a common base batch in which the composition of the non-volatile oil-phase base, oil-phase gelling agent, volatile solvent, and oil-phase dispersant is substantially the same between each layer. The common base batch is divided into multiple parts, and then a coloring component package and an optical control component package different for each layer are introduced into each divided part to determine the color of each layer. The coloring component package for each layer is configured such that the combination of types and content of inorganic pigments, organic pigments, and dyes is set differently for each layer, and the optical control component package for each layer is configured such that the content ratio of titanium dioxide and synthetic fluorophlogopite is set differently for each layer, thereby forming an ombre effect in which the lower, middle, and upper layers are visually distinguished in one or more of lightness, saturation, and hue. Furthermore, the density difference and refractive index difference between each layer are minimized by the use of the common base batch, thereby ensuring long-term stability of the interlayer boundary.

[0016] A lip and cheek product comprising a transparent or translucent container and a multilayer cosmetic composition contained within the container, wherein the multilayer cosmetic composition comprises a lower layer, a middle layer, and an upper layer that are sequentially stacked and filled from the bottom to the top of the container, and each of the lower layer, middle layer, and upper layer comprises an oil-phase gel matrix comprising a non-volatile oil-phase base, an oil-phase gelling agent, and a volatile solvent, and one or more of a coloring component and an optical control component dispersed within the oil-phase gel matrix to impart different colors to each layer, and the lower layer, middle layer, and upper layer form an ombré appearance of different colors, and the container is provided with a coating member, and the coating member contacts the lower layer, middle layer, and upper layer simultaneously so that the contents of multiple layers are mixed and coated to achieve a gradient color.

[0017] The dispensing member includes a stick-type applicator integrally coupled to a cap mounted at the opening of a container, and the stick-type applicator has a length that extends through the lower, middle, and upper layers inside the container while the cap is fastened to the container, and the tip of the stick-type applicator is provided with one or more dispensing surfaces among a flocked fiber layer, a sponge, or a silicone tip, and the dispensing surface contacts the contents of the lower, middle, and upper layers respectively, so that the color of the lower layer, the color of the middle layer, and the color of the upper layer are sequentially attached along the length direction of the dispensing surface, thereby realizing gradient color development with a single stroke when applied to the lips or cheeks, and the composition of the oil-phase gel matrix of the lower, middle, and upper layers is substantially the same so that the density difference between each layer is 0.05 g / cm³ or less, and the yield stress of each layer is maintained at 10 Pa or more by the gel network formed within each layer by the oil-phase gelling agent, thereby suppressing interlayer flow mixing due to self-weight at room temperature, and between the lower, middle, and upper layers The interlayer interface can be configured so that an ombré appearance is maintained for more than 6 months under room temperature storage conditions after manufacturing, by suppressing interfacial instability by the same density and refractive index of the oil-phase gel matrix.

[0018] The multilayer cosmetic composition is formed by stacking by a sequential filling and partial setting process, and the sequential filling and partial setting process comprises the steps of: preparing a common base batch including a non-volatile oil phase base, an oil phase gelling agent, a volatile solvent, and an oil phase dispersant; dividing the common base batch into multiple parts and introducing a coloring component package and an optical control component package different for each layer into each divided part to prepare a composition for the lower layer, a composition for the middle layer, and a composition for the upper layer, respectively; a first partial setting step in which the surface of the lower layer is hardened by evaporating a portion of the volatile solvent after filling the composition for the lower layer into a container; a second partial setting step in which the surface of the middle layer is hardened by evaporating a portion of the volatile solvent after filling the middle layer with the hardened composition for the middle layer; and a step in which the composition for the upper layer is filled on the hardened middle layer. The composition may be configured such that interfacial mixing with the subsequently filled layer is suppressed by surface hardening in the first and second partial setting steps, thereby ensuring clarity of the interlayer boundary. Effects of the invention

[0020] The multilayer cosmetic composition and lip and cheek product according to the present invention have a three-layer ombré structure filled within a single product, and thus have the advantage of enabling natural shading and gradient effects with only a single stroke of the built-in applicator without the need for separate layering work or the simultaneous use of multiple color products when used.

[0021] In addition, the multilayer cosmetic composition and lip and cheek product according to the present invention can shorten makeup time and significantly increase portability by integrating an ombré function into a formulation that can be used for both lips and cheeks.

[0022] The multilayer cosmetic composition and lip and cheek product according to the present invention provide high aesthetic appeal through the clear three-layer ombré appearance visible from the outside of a transparent or translucent container, contributing to consumer recognition and purchasing inducement, and can secure a distinct design differentiation from conventional single-color lip products.

[0023] The multilayer cosmetic composition and lip and cheek product according to the present invention can provide structural stability without interlayer mixing or boundary blurring even during long-term storage by designing all layers to equally share an oil-phase gel matrix formed by an oil-phase gelling agent and a volatile oil as the layer-forming axis, thereby having the same density and refractive index. Brief explanation of the drawing

[0025] FIG. 1 is a block diagram showing the composition of a multilayer lip and cheek product according to one embodiment of the present invention. FIG. 2a is an external photograph showing a state in which a multilayer cosmetic composition according to one embodiment of the present invention is stacked and filled in a container. FIG. 2b shows the ingredient table of the entire product corresponding to the embodiment illustrated in FIG. 2a. FIG. 3a is an external photograph showing a state in which a multilayer cosmetic composition according to another embodiment of the present invention is laminated and filled in a container. FIG. 3b shows the ingredient table of the entire product corresponding to the embodiment illustrated in FIG. 3a. FIG. 4 is an exploded perspective view showing the container structure of a lip and cheek product according to one embodiment of the present invention. FIG. 5 is a schematic exploded perspective view of a multilayer lip and cheek product according to one embodiment of the present invention. Specific details for implementing the invention

[0026] FIG. 1 is a block diagram showing the composition of a multilayer lip and cheek product according to one embodiment of the present invention.

[0027] Referring to FIG. 1, the overall composition of a multilayer lip and cheek product (100) according to one embodiment of the present invention is described as follows.

[0028] A multilayer lip and cheek product (100) may include a transparent container body (120) and a multilayer cosmetic composition (130). The transparent container body (120) is a container that holds the multilayer cosmetic composition (130) inside, and may be formed of a transparent or translucent material so that the ombré appearance of the multilayer cosmetic composition (130) filled with layers inside can be visually perceived from the outside. The material of the transparent container body (120) may be, for example, transparent resin or glass, but is not limited thereto.

[0029] The multilayer cosmetic composition (130) is contained within a transparent container body (120) and may be a composition in which multiple layers are stacked and filled to exhibit different colors for each layer. The multilayer cosmetic composition (130) may include an oil-phase gel matrix (140) and a color / optical control package (150).

[0030] The oil-phase gel matrix (140) may correspond to a substrate commonly included in each layer of the multilayer cosmetic composition (130). The oil-phase gel matrix (140) may be composed of a non-volatile oil-phase base, an oil-phase gelling agent, and a volatile solvent, and may optionally further include an oil-phase dispersant. The oil-phase gel matrix (140) may have substantially the same composition in each layer, thereby minimizing the difference in density and refractive index between each layer and ensuring the stability of the interlayer boundary. Due to the gel network formed by the oil-phase gelling agent within the non-volatile oil-phase base, each layer may maintain a semi-solid state, thereby suppressing interlayer flow mixing.

[0031] The color / optical control package (150) may correspond to a combination of ingredients that are included differently in each layer to impart color differences between layers. The color / optical control package (150) may include one or more of a coloring ingredient and an optical control ingredient. The coloring ingredient may include one or more of an inorganic pigment, an organic pigment, and a dye to determine the hue of each layer, and the optical control ingredient may include one or more of an opacifying agent and a reflection / pearl control agent to control the brightness, opacity, or gloss of each layer. By setting the combination of the type and content of the color / optical control package (150) differently for each layer, each layer may exhibit different colors, brightness, or saturation, thereby realizing an ombre effect.

[0032] That is, the multilayer lip and cheek product (100) of the present invention may have a dual design structure in which an oil-based gel matrix (140) is responsible for interlayer structural stability and a color / optical control package (150) is responsible for interlayer visual differentiation. By maintaining the oil-based gel matrix (140) identically in each layer and setting only the color / optical control package (150) differently for each layer, interlayer physical property uniformity and color diversity can be secured simultaneously.

[0034] A multilayer cosmetic composition according to one embodiment of the present invention is a multilayer cosmetic composition that is laminated and filled in a container to form a plurality of visually distinguishable layers, comprising a lower layer, a middle layer, and an upper layer, wherein each of the lower layer, the middle layer, and the upper layer comprises an oil-phase gel matrix comprising a non-volatile oil-phase base, an oil-phase gelling agent, and a volatile solvent, and one or more of a coloring component and an optical control component dispersed within the oil-phase gel matrix, wherein the composition of the oil-phase gel matrix of the lower layer, the middle layer, and the upper layer is substantially the same, and the type or content of one or more of the coloring component and the optical control component differs from layer to layer, so that each layer exhibits a different color, brightness, or saturation, and the oil-phase gelling agent forms a gel network within the oil-phase gel matrix to suppress the flow of each layer, thereby preventing interlayer mixing.

[0035] A multilayer cosmetic composition according to one embodiment of the present invention is a multilayer cosmetic composition that is laminated and filled in a container to form a plurality of visually distinguishable layers, comprising a lower layer, a middle layer, and an upper layer, wherein each of the lower layer, the middle layer, and the upper layer comprises an oil-phase gel matrix comprising a non-volatile oil-phase base, an oil-phase gelling agent, and a volatile solvent, and one or more of a coloring component and an optical control component dispersed within the oil-phase gel matrix, wherein the composition of the oil-phase gel matrix of the lower layer, the middle layer, and the upper layer is substantially the same, and the type or content of one or more of the coloring component and the optical control component differs from layer to layer, so that each layer exhibits a different color, brightness, or saturation, and the oil-phase gelling agent forms a gel network within the oil-phase gel matrix to suppress the flow of each layer, thereby preventing interlayer mixing.

[0036] Here, layer filling refers to a state in which multiple layers are stacked vertically by sequentially injecting contents of different colors into a single container from the bottom to the top. Each layer is not contained in a physically separated container, but can be arranged vertically within the same container with interfaces that come into contact with one another. In this case, if the container is made of a transparent or translucent material, the multiple layers can be visually distinguished by color from the outside, and this appearance can form an ombré effect.

[0037] In the present invention, the number of layers is based on a basic configuration of three layers, including a lower layer, a middle layer, and an upper layer, but this is merely an example, and depending on the design, a configuration of two layers or four or more layers may also be possible.

[0038] An oil-phase gel matrix may refer to a substrate that forms a gel state primarily composed of oil components in an anhydrous system that does not contain water. The composition of the present invention may be based on an anhydrous oil-phase gel system that substantially excludes aqueous components, rather than an emulsion system such as an oil-in-water or water-in-oil type. By adopting such an anhydrous system, the breakdown of interlayer boundaries caused by oil-water separation that may occur in emulsion systems can be fundamentally prevented.

[0039] The non-volatile oil phase base is an oil component that does not substantially volatilize at room temperature and can constitute the main medium of each layer. The non-volatile oil phase base accounts for the highest weight proportion of the entire composition and can serve as a framework that governs the volume and physical properties of each layer. When the non-volatile oil phase base is used in each layer with the same components and similar content, the difference in density and refractive index between layers is minimized, thereby suppressing interlayer penetration due to gravity or interfacial instability.

[0040] An oil-phase gelling agent may refer to a component that forms a three-dimensional gel network through the physical entanglement or crystallization of polymer chains within a non-volatile oil-phase base. Once the gel network is formed, the oil-phase base can transition from a freely flowing liquid state to a semi-solid state. Consequently, each layer acquires a yield stress above a certain level, thereby suppressing internal flow within the layer even when subjected to self-weight or external impact. Yield stress refers to the property where a material maintains its shape without flowing when external stress is below a certain threshold value. The imparting of yield stress by such a gel network may be the core mechanism for preventing interlayer mixing in the present invention.

[0041] Volatile solvents are oil components that evaporate slowly at room temperature or slightly higher, and can play a dual role in the manufacturing and filling processes of the composition. First, the presence of volatile solvents within the oil-phase gel matrix at the time of filling temporarily reduces the viscosity of the matrix, thereby facilitating injection into the container. Subsequently, when a portion of the volatile solvent evaporates after filling is complete, the surface of the corresponding layer hardens, which can suppress interfacial mixing with the previously filled layer when filling the subsequent layer. This process can be referred to as partial setting.

[0042] The coloring component is a component that imparts a unique color tone to each layer and may include one or more of inorganic pigments, organic pigments, and dyes. Inorganic pigments are metal oxide pigments, such as iron oxide series, which can express color by being dispersed in the oil-phase gel matrix in particle form. Since inorganic pigments do not dissolve in oil and maintain a particle state, they may exhibit minimal interlayer color shift and excellent color stability. Organic pigments are oil-dispersible organic dyes, such as lake pigments, and possess high color development, allowing for distinct color expression even with small amounts. Dyes are coloring components with a tendency to dissolve in oil and can be utilized for fine color tone correction; however, due to their solubility, the possibility of interlayer shift may be relatively high. Therefore, it may be desirable to use dyes in extremely small quantities for auxiliary fine color tone correction purposes rather than as a primary coloring means.

[0043] Optical control components refer to components that play a role in amplifying visual differences between layers by controlling the brightness, opacity, gloss, or pearl effect of each layer. Unlike coloring components, optical control components do not impart a unique hue; instead, they can adjust the brightness or depth of color perceived by the user by altering the reflection, scattering, or absorption characteristics of light. For example, a layer with a high content of an optical control component that provides opacity may exhibit relatively bright and pastel-like colors, whereas a layer with a low content of such a component may display the original hue of the coloring component more intensely. Additionally, optical control components that impart a pearl effect can alter the glossiness of the layer surface through light reflection, causing the perceived color to differ even if the same coloring component is present.

[0044] In the present invention, the statement that the composition of the oil-phase gel matrix of the lower, middle, and upper layers is substantially identical may mean that the types and contents of the non-volatile oil-phase base, oil-phase gelling agent, volatile solvent, and optionally included oil-phase dispersant constituting each layer are identical between layers or have only technically negligible differences. This can be achieved by preparing a single common base batch, dividing it into multiple portions, and introducing different coloring components and optical control components into each portion for each layer. By adopting this common base batch method, the density and refractive index between layers become substantially identical; thus, interlayer penetration due to density differences or interfacial instability due to refractive index differences is suppressed, thereby ensuring long-term storage stability of the multilayer structure. Furthermore, since the weight proportion of the coloring components and optical control components in the total composition is relatively small, even if their types and contents differ from layer to layer, their influence on the physical properties of each layer may be minimal.

[0045] The statement that each layer exhibits a different color, brightness, or saturation can be achieved by setting the type, content, or combination of the coloring component and optical control component differently for each layer. For example, for a layer intended for a bright color, the content of the optical control component for the opacity function can be increased and the pigment content set low, while for a layer intended for a dark color, the content of the pigment and lake pigment can be increased and the content of the opacity component set low. Through such layer-by-layer coloring / optical design, an ombré effect in which the shade of color gradually changes from the lower layer to the upper layer, or in the opposite direction, can be realized. The specific combination of the layer-by-layer color design can be freely changed according to the color concept of the target product and is not limited to the above examples.

[0046] The statement that an oil-phase gelling agent forms a gel network within an oil-phase gel matrix to suppress flow in each layer may mean that the polymer chains of the oil-phase gelling agent create a three-dimensionally connected network structure within a non-volatile oil-phase base through physical entanglement, hydrogen bonding, or the formation of crystalline regions, and that this network traps oil within it to suppress flow. Since such a gel network is formed independently in each layer, material exchange at the interface with adjacent layers can be suppressed while each layer maintains a semi-solid state. As a result, the phenomenon of coloring components and optical control components migrating from one layer to an adjacent layer is prevented, allowing the clarity of interlayer boundaries and the ombré appearance to be maintained for a long period.

[0047] In implementing the above multilayer cosmetic composition, the preparation and lamination of each layer can be performed in the following manner.

[0048] First, a common base batch can be prepared by mixing a non-volatile oil-phase base, an oil-phase gelling agent, a volatile solvent, and, if necessary, an oil-phase dispersant in a predetermined ratio. At this time, the non-volatile oil-phase base and the oil-phase gelling agent can be mixed under a heated state to completely dissolve the oil-phase gelling agent, and then, during the cooling process, the polymer chains of the oil-phase gelling agent can be allowed to form a gel network through physical entanglement or crystallization. The volatile solvent can be introduced during the heating and mixing step or the cooling step, and the introduction of the volatile solvent reduces the viscosity of the entire matrix, thereby ensuring injectability in the subsequent filling process.

[0049] The manufactured common base batch can be divided into multiple fractions. By introducing different coloring components and optical control components into each fraction layer and stirring and dispersing them, compositions for the lower layer, middle layer, and upper layer can be prepared, respectively. If the coloring component is a pigment in particulate form, it can be uniformly distributed within the oil-phase gel matrix by stirring, and the oil-phase dispersant can be adsorbed onto the surface of the pigment particles to prevent aggregation between particles and maintain dispersion stability.

[0050] In the lamination filling process, a predetermined amount of the lower layer composition can first be injected into the bottom of the container. During injection, the temperature of the composition may be maintained higher than the gelation temperature, or the composition may be injected while its viscosity is reduced by a volatile solvent to ensure adhesion with the inner wall of the container and leveling. Once the injection of the lower layer composition is completed, partial setting may be performed to increase the viscosity of the lower layer surface by evaporating a portion of the volatile solvent through room temperature storage or heating. When the gel strength of the lower layer surface is increased by partial setting, the phenomenon of the lower layer being pushed out by the load of the subsequently filled middle layer composition or the two layers mixing at the interface can be suppressed.

[0051] A three-layer stacked structure can be completed by injecting a middle layer composition onto a partially set lower layer, performing partial setting in the same manner, and then injecting an upper layer composition thereon. The final filled composition can be left at room temperature for a sufficient amount of time to further evaporate residual volatile solvents, thereby ensuring that the gel strength of the entire layer reaches a final level.

[0052] The thickness ratio of each layer can be set according to the shape of the container and the desired visual effect. For example, a three-layer structure of equal thickness can be formed by setting the filling mass ratio of the lower, middle, and upper layers equally to 1:1:1, or the visual occupancy area of ​​the corresponding color can be expanded by increasing the ratio of a specific layer. The filling mass ratio can be freely adjusted according to the color concept and design intent of the product and is not limited to the above examples.

[0053] In implementing the prevention of interlayer mixing, the present invention allows for the combined action of three mechanisms: imparting yield stress by a gel network, minimizing the interlayer density difference by a common base, and interfacial hardening by partial setting. The gel network can maintain the shape of the layer itself by suppressing internal flow within each layer. The use of a common base can substantially eliminate the density difference between adjacent layers, thereby preventing interlayer penetration caused by buoyancy or sedimentation resulting from the density difference. Partial setting can temporarily increase the surface gel strength of the preceding filled layer during the filling process, thereby suppressing mechanical mixing that may occur during the injection of the subsequent layer. Through the combination of these three mechanisms, the clarity of the interlayer boundaries and the ombré appearance can be stably maintained not only immediately after manufacturing but also under long-term storage conditions.

[0054] In addition, the oil-phase dispersant can adsorb to the surface of pigment particles to improve particle wettability and suppress aggregation and sedimentation between particles. This maintains a state where coloring components are uniformly distributed within each layer, thereby preventing pigment particles contained in one layer from migrating to adjacent layers or concentrating near the interface. This dispersion stabilization function contributes to preventing color shift between layers, thereby assisting in ensuring the long-term stability of the ombré appearance.

[0055] In the above implementation method, specific process parameters such as heating temperature, stirring speed, partial setting time, and volatilization conditions can be appropriately adjusted according to the physical properties of the raw materials used and the shape of the container, and the method described above corresponds to one embodiment and is not limited thereto.

[0057] FIG. 2a is an external photograph showing a state in which a multilayer cosmetic composition according to one embodiment of the present invention is stacked and filled in a container.

[0058] As illustrated in FIG. 2a, a first layer (210) corresponding to the upper layer, a second layer (220) corresponding to the middle layer, and a third layer (230) corresponding to the lower layer may be sequentially stacked and arranged from top to bottom inside a transparent container. The first layer (210), the second layer (220), and the third layer (230) may each display different colors to form a visually distinguishable ombré appearance. In the embodiment of FIG. 2a, the first layer (210) may display a relatively bright color, the third layer (230) may display a relatively dark color, and the second layer (220) may display a color corresponding to an intermediate tone between the first layer (210) and the third layer (230). By doing so, an ombré effect may be formed in which the color intensity gradually becomes darker from the top to the bottom of the container. However, the direction of the color intensity may be set in the opposite direction depending on the design, and is not limited to the above example.

[0059] FIG. 2b shows the ingredient table of the entire product corresponding to the embodiment illustrated in FIG. 2a.

[0060] The composition table of FIG. 2b may represent the weight percentage (w / w%) of each component based on the total product, including the first layer (210), the second layer (220), and the third layer (230). As shown in FIG. 2b, hydrogenated poly(C6-14 olefin), a moisture evaporation barrier agent, may be included as the main component constituting the oil-phase gel matrix at the highest proportion of about 70.53 wt%, synthetic fluorophlogopite, a bulking agent, at about 10.00 wt%, polyglyceryl-2 triisostearate, a skin softening agent, at about 9.36 wt%, hydrogenated styrene / isoprene copolymer, a viscosity modifier, at about 6.13 wt%, and isododecane, a solvent, at about 3.67 wt%. As coloring components, titanium dioxide may be included in an amount of about 0.20 wt% and Blue No. 1 in an amount of about 0.0092 wt%. As stability auxiliary components, dehydroacetic acid, a sterilizing preservative, may be included in an amount of about 0.10 wt% and pentaerythrityl tetra-di-t-butylhydroxyhydrocinnamate, an antioxidant, in an amount of about 0.0074 wt%.

[0061] In the composition table of FIG. 2b, the combined weight ratio of the components constituting the oil phase gel matrix, namely hydrogenated poly(C6-14 olefin), synthetic fluorophlogopite, polyglyceryl-2 triisostearate, hydrogenated styrene / isoprene copolymer, and isododecane, may correspond to approximately 99.68 weight%. This may suggest that the first layer (210), the second layer (220), and the third layer (230) share the same oil phase gel matrix. The combined weight ratio of the coloring components, titanium dioxide and Blue 1, may be only approximately 0.21 weight%, which may indicate that even if the proportion of coloring components in the overall composition table is very small, a visually sufficient color difference can be achieved by differentially mixing them layer by layer.

[0062] In the embodiment of FIG. 2a, the color difference between the first layer (210), the second layer (220), and the third layer (230) may be achieved by setting the content of titanium dioxide and Blue No. 1 included in each layer differently for each layer. For example, the first layer (210), which has a relatively bright color, may contain titanium dioxide at a relatively high ratio and Blue No. 1 at a low ratio, and the third layer (230), which has a relatively dark color, may contain Blue No. 1 at a relatively high ratio and titanium dioxide at a low ratio. The second layer (220) may contain both components at an intermediate level to form an intermediate tone between the first layer (210) and the third layer (230). However, since the ingredient table in FIG. 2b represents the total weight ratio based on the entire product, the individual weight ratios for each layer may not be directly shown in FIG. 2b. The weight ratio of each layer can be set to be consistent with the entire composition table by the relationship in which the content of each component in the entire composition table appears as a weighted average of the filling mass ratio of each layer.

[0064] According to one embodiment, the non-volatile oil phase base comprises hydrogenated poly(C6-14 olefin) and is included in an amount of 60 to 80 weight% based on the total weight of the composition, and the oil phase gelling agent comprises hydrogenated styrene / isoprene copolymer and is included in an amount of 3 to 10 weight% based on the total weight of the composition to form a gel network by physical crosslinking within the non-volatile oil phase base, thereby imparting yield stress to each layer and suppressing interlayer flow mixing caused by self-weight and external impact, and the volatile solvent comprises isododecane and is included in an amount of 2 to 8 weight% based on the total weight of the composition to temporarily reduce the viscosity of the oil phase gel matrix during filling and harden the surface of each layer by volatilization after filling, and the oil phase gel matrix further comprises polyglyceryl-2 triisostearate as an oil phase dispersant in an amount of 5 to 15 weight% based on the total weight of the composition to uniformly disperse coloring components and optical control components within the oil phase base and prevent sedimentation of pigment particles and interlayer color shift. It can be configured to suppress.

[0065] In a multilayer cosmetic composition according to one embodiment of the present invention, the non-volatile oil phase base may include hydrogenated poly(C6-14 olefin). Hydrogenated poly(C6-14 olefin) is a saturated hydrocarbon polymer obtained by polymerizing an olefin having 6 to 14 carbon atoms and then hydrogenating it, and may exhibit a semi-solid to high-viscosity liquid form at room temperature. This component is chemically stable and has excellent resistance to oxidation, so it can serve as a medium in an anhydrous oil phase system without changes in physical properties for a long period. In addition, since it has a colorless to translucent appearance, it may not interfere with color expression by coloring components and optical control components. Hydrogenated poly(C6-14 olefin) may be included in an amount of 60 to 80 weight% based on the total weight of the composition. If less than 60 weight%, it is difficult to sufficiently constitute the volume of each layer, so the formation of the gel network may become uneven, and if it exceeds 80 weight%, the content of the gelling agent and coloring component becomes relatively insufficient, so the interlayer flow inhibition power or color expression may be reduced. However, the above range corresponds to a preferred embodiment and can be adjusted according to the physical properties of the raw materials used and the product design.

[0066] The oil phase gelling agent may include a hydrogenated styrene / isoprene copolymer. The hydrogenated styrene / isoprene copolymer is a type of thermoplastic elastomer obtained by hydrogenating a block copolymer of styrene and isoprene, and may have the ability to form physical crosslinking points within oil. Specifically, the styrene blocks of this copolymer have low solubility in a non-volatile oil phase base and may associate with each other to form physical crosslinking points (crystalline domains), while the isoprene blocks (in the hydrogenated state) have high affinity for the oil phase base and may expand within the oil. Due to this structure, a gel network is formed in which physical crosslinking points between the styrene blocks are connected in three dimensions, and this network can trap the oil phase base within it to convert the entire matrix into a semi-solid state. This copolymer may be included in an amount of 3 to 10 weight percent based on the total weight of the composition. If it is less than 3 weight%, the gel network is not sufficiently developed, which may lower the yield stress of each layer, and consequently, interlayer flow mixing may occur due to self-weight or external impact. If it exceeds 10 weight%, the hardness of the matrix becomes excessive, making it difficult to pick up the contents with a coating agent or reducing spreadability on the skin.

[0067] The formation of a gel network by physical crosslinking can mean that the network is formed by physical interactions between polymer chains rather than chemical covalent bonds. Physical crosslinking can have thermoreversible properties, such as disintegrating upon heating and reforming upon cooling. This thermoreversibility can be advantageous in the manufacturing process. Specifically, when heated, the gel network disintegrates, making the composition fluid, which facilitates injection into a container and stirring / dispersing of coloring components; conversely, after filling, the gel network reforms upon cooling or leaving at room temperature, thereby fixing the shape of each layer.

[0068] The yield stress of each layer may refer to a critical stress value at which flow begins when an external stress is applied to the layer. Due to the formation of a gel network, each layer has a predetermined yield stress, so that flow within a layer may not occur when the stress, such as self-weight (self-load due to gravity) or external impact occurring during transport, is below the yield stress. As a result, interlayer flow mixing, where the contents of one layer flow into another layer between adjacent layers, can be suppressed.

[0069] The volatile solvent may include isododecane. Isododecane is a branched saturated hydrocarbon with 12 carbon atoms, and since its boiling point is in the range of approximately 170 to 180°C, it may have the characteristic of slowly evaporating at room temperature. Isododecane is colorless and odorless and has excellent compatibility with the oil phase base, allowing it to be uniformly incorporated into the oil phase gel matrix. Isododecane may be included in an amount of 2 to 8 weight percent based on the total weight of the composition. If isododecane is present in the matrix at the time of filling, the effective concentration of the gel network is relatively diluted, which may temporarily reduce the viscosity of the entire matrix. As a result, the composition may have sufficient fluidity even without heating, making it easy to inject into a container. After filling is complete, a portion of the isododecane may slowly evaporate from the exposed surface. As the isododecane evaporates, the effective concentration of the gel network near the surface of the corresponding layer increases, which may increase the gel strength of the surface. This may correspond to the aforementioned partial setting mechanism. If it is less than 2 weight%, the viscosity reduction effect is negligible and the filling processability may be reduced, and if it exceeds 8 weight%, the amount of residual solvent is excessive, so the gel strength of the final product is not sufficiently secured or the physical properties of the product may change due to excessive volatilization over a long period.

[0070] Polyglyceryl-2 triisostearate may be further included as an oil phase dispersant in an amount of 5 to 15 weight% based on the total weight of the composition. Polyglyceryl-2 triisostearate is a type of nonionic surfactant in which isostearic acid is ester-bonded to a polyglycerin backbone, and it can improve the wettability of pigment particles by adsorbing to the surface of pigment particles within the oil phase medium and suppress aggregation caused by van der Waals forces between particles. As a result, particles of coloring components and optical control components can be maintained in a state of uniform dispersion within the oil phase gel matrix. When a uniform dispersion state is maintained, the phenomenon of pigment particles settling to the bottom of the layer due to gravity can be suppressed, and furthermore, interlayer color shift, in which pigment particles move to other layers due to a concentration gradient near the interface with adjacent layers, can also be suppressed. If less than 5 weight%, the dispersion stabilization effect is insufficient, which may cause aggregation or sedimentation of the pigment, and if more than 15 weight%, the adhesiveness of the composition may become excessive or the sensation of use on the skin may be reduced. The type of oil phase dispersant is not limited to polyglyceryl-2 triisostearate and may be replaced or used in combination with other nonionic surfactants or polymer dispersants capable of performing pigment dispersion and stabilization functions within the oil phase medium.

[0072] FIG. 3a is an external photograph showing a state in which a multilayer cosmetic composition according to another embodiment of the present invention is laminated and filled in a container.

[0073] As illustrated in FIG. 3a, a first layer (310) corresponding to the upper layer, a second layer (320) corresponding to the middle layer, and a third layer (330) corresponding to the lower layer may be sequentially stacked and arranged from top to bottom inside a transparent container. The embodiment of FIG. 3a may have a three-layer stacked structure based on an oil-phase gel matrix identical to the embodiment of FIG. 2a, but may have a different combination of the types and content of coloring components and optical control components to realize an ombre appearance of a different color family. In the embodiment of FIG. 3a, the first layer (310) may exhibit a relatively deep red color family, the third layer (330) may exhibit a relatively bright pink color family, and the second layer (320) may exhibit a color corresponding to an intermediate tone between the first layer (310) and the third layer (330). By doing so, an ombre effect may be formed in which the concentration of the color gradually becomes lighter as it goes from the top to the bottom of the container. Compared to the embodiment of FIG. 2a, which shows an ombré in which the color becomes darker from top to bottom, the embodiment of FIG. 3a may have the direction of the color shade set in the opposite direction. This may indicate that various ombré directions can be realized by changing the arrangement order of the coloring component packages by layer in the same multilayer stacked structure.

[0075] FIG. 3b shows the ingredient table of the entire product corresponding to the embodiment illustrated in FIG. 3a.

[0076] As shown in the composition table of FIG. 3b, hydrogenated poly(C6-14 olefin) may be included in the main components constituting the oil phase gel matrix in an amount of about 68.01 wt%, polyglyceryl-2 triisostearate in an amount of about 11.07 wt%, synthetic fluorophlogopite in an amount of about 9.00 wt%, hydrogenated styrene / isoprene copolymer in an amount of about 5.65 wt%, and isododecane in an amount of about 4.67 wt%. When compared with the example of FIG. 2b, it can be confirmed that the content of the main components constituting the oil phase gel matrix is ​​within a similar range. This suggests that the example of FIG. 2a and the example of FIG. 3a are based on substantially the same common base matrix, but different color series of ombré are realized by varying only the combination of coloring components and optical control components.

[0077] In the embodiment of FIG. 3b, the coloring components may include a variety of types compared to the embodiment of FIG. 2b. Specifically, titanium dioxide, which is an optical control component, may be included at about 1.03 wt%; iron oxide yellow and iron oxide black may be included at about 0.17 wt% and about 0.025 wt% as inorganic pigments; Red 202 may be included at about 0.16 wt% and Red 201 at about 0.02 wt% as organic pigments (lake pigments); and Yellow 4 may be included at about 0.09 wt% and Blue 1 at about 0.0068 wt% as dyes. Compared to the embodiment of FIG. 2b, where the coloring components consist of two types, titanium dioxide and Blue 1, in the embodiment of FIG. 3b, inorganic pigments, organic pigments, and dyes may be used in combination to achieve a reddish hue. This indicates that by changing the type and combination of coloring ingredients, ombré products of various color series, ranging from blue (Fig. 2a) to red (Fig. 3a), can be realized on the same oil-based gel matrix.

[0078] In the example of FIG. 3b, the titanium dioxide content is set to be about 1.03 wt%, which is higher than the about 0.20 wt% in FIG. 2b, in order to realize a pastel pink tone color by combining it with a red pigment. When the opacifying effect of titanium dioxide acts on the deep red hue provided by the red iron oxide and lake pigment, a soft pink tone is expressed in the light layer and a deep rose to red tone is expressed in the dark layer, so that an ombre effect changing from pink to red can be formed.

[0079] In the ingredient table of FIG. 3b, dehydroacetic acid may be included in an amount of about 0.10 wt% and pentaerythrityltetra-di-t-butylhydroxyhydrocinnamate in an amount of about 0.0068 wt% as stability auxiliary ingredients. The types and amounts of these stability auxiliary ingredients may be substantially the same as in the example of FIG. 2b, which may indicate that the stability auxiliary ingredients are included in a common base batch and can be applied equally to all color variation products.

[0080] According to one embodiment, the coloring component comprises one or more of an inorganic pigment, an organic pigment, and a dye; the inorganic pigment comprises one or more of red iron oxide, yellow iron oxide, and black iron oxide and is fixed within an oil gel matrix in a particle-dispersed form to suppress interlayer migration; the organic pigment comprises one or more lake pigments of Red 201, Red 202, and Red 104 (1); the dye comprises one or more of Yellow 4, Yellow 5, and Blue 1; the optical control component comprises one or more of titanium dioxide, which performs brightness control and opacity, and synthetic fluorophlogopite, which imparts light reflection and a pearl effect; the layer exhibiting a relatively bright color among the lower layer, middle layer, and upper layer has a titanium dioxide content of 0.5% by weight or more based on the weight of the layer and a combined content of the inorganic pigment and the organic pigment of less than 0.5% by weight based on the weight of the layer; and the layer exhibiting a relatively dark color has a titanium dioxide content of less than 0.5% by weight based on the weight of the layer and a combined content of the inorganic pigment and the organic pigment The total content of the pigment can be configured to be 0.5% by weight or more based on the weight of the layer.

[0081] In one embodiment of the present invention, the coloring component may include one or more of three types of inorganic pigments, organic pigments, and dyes, and the color tone of each layer may be determined by a combination thereof.

[0082] Inorganic pigments are metal oxide-based pigments and may include one or more of red iron oxide, yellow iron oxide, and black iron oxide. Red iron oxide can impart a red to reddish-brown hue, yellow iron oxide can impart a yellow to yellowish-brown hue, and black iron oxide can impart a black hue or be mixed with other pigments to control saturation and brightness. Inorganic pigments may adopt a particle-dispersed coloring method in which they are dispersed while maintaining a particle state without dissolving in the oil-phase gel matrix. In the case of particle dispersion, pigment particles can be physically trapped within the gel network and their positions fixed, thereby inhibiting diffusion or migration to adjacent layers. This characteristic can be advantageous for maintaining distinct color boundaries between layers in a multilayer stacked structure.

[0083] The organic pigment may include one or more lake pigments of Red 201, Red 202, and Red 104 (1). Lake pigments are pigments obtained by depositing water-soluble dyes onto an insoluble substrate, and can be dispersed in the form of particles without dissolving in an oil phase medium. Lake pigments have a higher color-developing power than inorganic pigments, so they can produce vivid color tones even with a small amount of use, and are particularly suitable for the distinct color development of red tones required in lip products. Since lake pigments are also of the particle-dispersed type, they can have similar advantages to inorganic pigments in terms of position fixation within the gel network and inhibition of interlayer movement.

[0084] The dye may include one or more of Yellow No. 4, Yellow No. 5, and Blue No. 1. Since the dye has a tendency to dissolve in an oil phase medium, it can be dispersed at the molecular level rather than in the form of particles. Due to this tendency to dissolve, fine color correction may be possible. For example, fine color control, such as suppressing the yellow tint of red pigments or adding a blue tint, may be possible by adding a minute amount of Blue No. 1. However, since molecular diffusion due to concentration gradients may occur with soluble dyes, the possibility of interlayer color shift during long-term storage may be relatively higher compared to particle-dispersed pigments. Therefore, it may be preferable to use the dye in minute quantities for auxiliary color correction purposes rather than as a primary coloring agent. The types of coloring components listed above are exemplary and may be replaced or used in combination with other inorganic pigments, organic pigments, or dyes commonly used in the cosmetic field.

[0085] The optical control component may include one or more of titanium dioxide and synthetic fluorophlogopite. Titanium dioxide is a white pigment with a high refractive index that strongly scatters visible light, thereby imparting opacity and brightness enhancement effects. Layers with a high titanium dioxide content may exhibit bright, pastel colors as the original hue of the coloring component mixes with white. Synthetic fluorophlogopite is a type of synthetic mica that has a plate-like crystal structure and reflects incident light from its surface, thereby imparting a pearl effect and gloss. The intensity and texture of reflected light may vary depending on the content or particle size of synthetic fluorophlogopite; consequently, even layers containing the same combination of coloring components may differ in the perceived depth of color or glossiness by the user.

[0086] In the present invention, among the lower, middle, and upper layers, the layer exhibiting a relatively bright color may have a titanium dioxide content of 0.5% by weight or more based on the weight of the layer, and the combined content of inorganic and organic pigments may be set to less than 0.5% by weight based on the weight of the layer. This may be intended to allow the opacity and brightness-increasing effects of titanium dioxide to act predominantly, thereby causing the layer to exhibit a bright and soft hue. Conversely, the layer exhibiting a relatively dark color may have a titanium dioxide content of less than 0.5% by weight based on the weight of the layer, and the combined content of inorganic and organic pigments may be set to 0.5% by weight or more based on the weight of the layer. In this case, the brightness-increasing effect of titanium dioxide is suppressed, allowing the original dark hue of the pigment to be expressed. This inverse relationship between titanium dioxide and pigment content for each layer may be a core design principle for realizing the color shade difference of the three-layer ombré in the present invention.

[0087] The above value of 0.5 weight% is a reference value for clearly distinguishing the visual color difference between the light layer and the dark layer, and may correspond to the boundary where the dominant role of the opacity effect and the pigment color development effect is switched above or below this reference. However, the specific reference value may vary depending on the type of pigment used and the color development power, and the above value may correspond to a preferred embodiment.

[0088] The intermediate lightness layer contains both titanium dioxide and pigment in intermediate amounts, which can produce a color between the light and dark layers. This allows for the formation of an ombre effect in which the shade of color gradually changes from the lower layer to the upper layer.

[0090] According to one embodiment, the lower layer, middle layer, and upper layer are manufactured by dividing from a common base batch in which the composition of a non-volatile oil-phase base, an oil-phase gelling agent, a volatile solvent, and an oil-phase dispersant is substantially the same between each layer. The common base batch is divided into multiple parts, and then a coloring component package and an optical control component package different for each layer are introduced into each divided part to determine the color of each layer. The coloring component package for each layer is configured such that the combination of types and content of inorganic pigments, organic pigments, and dyes is set differently for each layer, and the optical control component package for each layer is configured such that the content ratio of titanium dioxide and synthetic fluorophlogopite is set differently for each layer, thereby forming an ombre effect in which the lower layer, middle layer, and upper layer are visually distinguished in one or more of lightness, saturation, and hue. Furthermore, the density difference and refractive index difference between each layer are minimized by the use of the common base batch, thereby ensuring long-term stability of the interlayer boundary.

[0091] In one embodiment of the present invention, the lower layer, the middle layer, and the upper layer may be manufactured by dividing from a common base batch. A common base batch may refer to a single batch of oil-phase gel matrix prepared by mixing a non-volatile oil-phase base, an oil-phase gelling agent, a volatile solvent, and an oil-phase dispersant in a predetermined ratio. This common base batch may not yet contain coloring components and optical control components. The purpose of using a common base batch may be to minimize differences in physical properties between layers by maintaining the same composition of the matrix constituting each layer.

[0092] The preparation of a common base batch can be carried out by heating and mixing a non-volatile oil-phase base and an oil-phase gelling agent to completely dissolve the gelling agent, and then adding an oil-phase dispersant and a volatile solvent to mix uniformly. The prepared common base batch can be divided into three (or a number corresponding to the target number of layers) portions, and by adding a coloring component package and an optical control component package, which are pre-set for each layer, to each portion and stirring and dispersing them, a composition for the lower layer, a composition for the middle layer, and a composition for the upper layer can be prepared, respectively.

[0093] Here, a coloring component package may refer to a combination of inorganic pigments, organic pigments, and dyes with predetermined types and amounts to be introduced into a specific layer. An optical control component package may refer to a combination of titanium dioxide and synthetic fluorophlogopite with predetermined ratios of amounts to be introduced into a specific layer. The composition of each package may be determined according to the target color, lightness, and saturation for each layer.

[0094] For example, an optical control component package and a coloring component package containing a relatively high proportion of titanium dioxide and a low proportion of pigment may be introduced into the divided portion corresponding to the light layer. A package containing a high proportion of iron oxide-based inorganic pigments and lake pigments and a low proportion of titanium dioxide may be introduced into the divided portion corresponding to the dark layer. An intermediate combination of the two packages may be introduced into the intermediate tone layer. By differentially setting these layer-specific packages, each layer may exhibit different colors, brightness, or saturation on the same matrix base, thereby realizing an ombré effect.

[0095] The technical advantage of the common base arrangement method may lie in ensuring uniformity of interlayer properties. Since the matrix of each layer is divided from the same arrangement, the content of the non-volatile oil phase base, the gel strength produced by the gelling agent, the residual amount of the volatile solvent, and the concentration of the dispersant can be substantially identical between layers. Consequently, since the density of each layer becomes substantially identical, interlayer penetration caused by buoyancy or sedimentation due to density differences can be prevented. Furthermore, since the refractive index of each layer becomes substantially identical, interfacial instability caused by differences in refractive index can be suppressed. Since the proportion of coloring components and optical modulating components in the total weight of the composition is relatively small, even if their types and contents differ from layer to layer, their influence on the density and refractive index of each layer may be technically negligible. This minimization of density and refractive index differences may serve as the technical basis for maintaining clear interlayer boundaries and stably preserving the ombré appearance even under long-term storage conditions after manufacturing.

[0096] The above common base arrangement method corresponds to a preferred implementation method and may be replaced by a method in which the matrix of each layer is manufactured individually but with the same composition and mixing ratio applied. The key is that the matrix composition between each layer is maintained to be substantially the same, and the specific manufacturing method to achieve this may not be limited to the above examples.

[0098] FIG. 4 is an exploded perspective view showing the container structure of a lip and cheek product according to one embodiment of the present invention.

[0099] As illustrated in FIG. 4, the container of the lip and cheek product may include a cap (410), a fastening part (412), a container body (414), and a stick-type applicator (420). On the left side of FIG. 4, the state in which the cap (410) is fastened to the container body (414) is shown, and on the right side, the state in which the cap (410) is separated from the container body (414) and the stick-type applicator (420) is withdrawn may be shown.

[0100] The cap (410) may be a member that covers and seals the upper opening of the container body (414). The cap (410) may be detachably mounted on the upper part of the container body (414). The cap (410) may serve to prevent contamination and excessive evaporation of volatile solvents by blocking external exposure of the contents. The material of the cap (410) may be synthetic resin, but is not limited thereto.

[0101] The fastening portion (412) may be a part that connects the cap (410) and the container body (414). As shown in FIG. 4, the fastening portion (412) may be formed in a screw thread shape so that it can be fastened to or detached from the container body (414) by rotating the cap (410). By the screw thread fastening method, a seal between the cap (410) and the container body (414) is ensured, thereby preventing the drying of the contents or excessive loss of volatile solvents during storage. However, the fastening method of the fastening portion (412) is not limited to screw threads, and various methods such as snap-fitting and lock-fitting may be applied.

[0102] The container body (414) may be a main body portion that accommodates a multilayer cosmetic composition inside. The container body (414) may be formed of a transparent or translucent material so that the lower, middle, and upper layers of the multilayer cosmetic composition stacked inside can be visually distinguished and recognized from the outside. As shown in FIG. 4, the internal space of the container body (414) may form a receiving portion in which the multilayer cosmetic composition is accommodated. The shape of the receiving portion may have a column shape extending in the vertical direction to be suitable for stacking the multilayer cosmetic composition. An opening is formed at the top of the container body (414) so ​​that the insertion and withdrawal of a stick-type applicator (420) and the filling of the contents can be performed.

[0103] The stick-type applicator (420) may be a coating member that is integrally coupled to the inner side of the cap (410) and is inserted into or withdrawn from the container body (414) in conjunction with the detachment of the cap (410). The stick-type applicator (420) may include a coating surface at the shaft portion and the tip portion.

[0104] The shaft portion may be a rod-shaped part extending downward from the inner center of the cap (410). The length of the shaft portion may be set such that the coating surface reaches the lower layer inside the container body (414) while the cap (410) is fastened to the container body (414). By doing so, the coating surface can maintain contact with the contents across the entire lower layer, middle layer, and upper layer while the cap (410) is fastened.

[0105] The application surface may be formed at the tip (bottom) of the shaft and may be a part that performs the function of collecting the contents and applying them to the skin. As shown in FIG. 4, the application surface may have an elliptical or spindle-shaped protrusion at the tip of the shaft. The application surface may be composed of one or more materials among a flocked fiber layer, a sponge, or a silicone tip. The surface area and shape of the application surface may be set considering the convenience of application to the lips or cheeks. The elliptical shape of the application surface may be advantageous for ensuring uniform application by adhering closely to the curved surface of the lips or a wide area of ​​the cheek.

[0106] When using, the cap (410) is rotated to release the connection of the fastening part (412), and when the cap (410) is pulled upward, the stick-type applicator (420) can be removed from inside the container body (414) together with the cap (410). At this time, the contents of the lower layer, middle layer, and upper layer, which were in contact inside the container body (414), may be attached to the application surface along the length direction of the application surface, corresponding to the layer positions. Specifically, the contents of the lower layer may be attached to the lower area of ​​the application surface, the contents of the middle layer to the middle area, and the contents of the upper layer to the upper area. When the user applies the application surface in this state to the lips or cheeks with a single stroke, multiple colors attached to the application surface are sequentially transferred onto the skin, thereby enabling a gradient color development.

[0107] After use, the stick-type applicator (420) can be re-inserted into the container body (414) and the cap (410) can be fastened to store it in a sealed state. By sealing with the cap (410), drying of the surface of the contents and excessive loss of volatile solvents during storage are prevented, so the physical properties and ombré appearance of the product can be maintained for a long time.

[0108] The specific shape, dimensions, material, and fastening method of the above-mentioned container structure correspond to one embodiment and can be freely changed according to the design intent and ease of use of the product.

[0110] According to one embodiment, a lip and cheek product comprising a transparent or translucent container and a multilayer cosmetic composition contained within the container, wherein the multilayer cosmetic composition comprises a lower layer, a middle layer, and an upper layer that are sequentially stacked and filled from the bottom to the top of the container, and each of the lower layer, middle layer, and upper layer comprises an oil-phase gel matrix comprising a non-volatile oil-phase base, an oil-phase gelling agent, and a volatile solvent, and one or more of a coloring component and an optical control component dispersed within the oil-phase gel matrix to impart different colors to each layer, and the lower layer, middle layer, and upper layer form an ombré appearance of different colors, and the container is provided with a coating member, and the coating member contacts the lower layer, middle layer, and upper layer simultaneously so that the contents of multiple layers are mixed and coated to achieve a gradient color.

[0111] A lip and cheek product according to one embodiment of the present invention may include a transparent or translucent container and a multilayer cosmetic composition contained within the container. Here, a lip and cheek product may refer to a color cosmetic product that can be used on both the lips and the cheeks. Conventional lip and cheek products were generally in the form of a single-color contents filled in a container, but in the present invention, a multilayer cosmetic composition is filled in multiple layers to simultaneously provide an ombré appearance and a gradient color development function.

[0112] Transparent or translucent containers may have the function of allowing the color differences between layers of a multilayer cosmetic composition laminated and filled inside to be visually perceived from the outside. The transparency of the container is not limited to complete transparency and may include translucent materials at a level where internal color distinction is visually possible. Various shapes, such as cylindrical or rectangular, may be applied to the container, and it may not be limited to a specific shape.

[0113] A multilayer cosmetic composition may include a lower layer, a middle layer, and an upper layer that are sequentially stacked and filled from the bottom to the top of a container. Each of the lower layer, middle layer, and upper layer may include an oil-phase gel matrix and one or more of a coloring component and an optical control component dispersed within the oil-phase gel matrix to impart different colors to each layer. The specific composition and role of the oil-phase gel matrix, the coloring component, and the optical control component may be as described above with respect to the composition.

[0114] The statement that the lower, middle, and upper layers form an ombré appearance of different colors may mean that when the container is observed from the outside, multiple layers are perceived as having gradually changing shades of color. The ombré appearance can contribute to securing the aesthetic appeal and design differentiation of the product, and can serve as a visual perception and purchase inducement factor for consumers prior to purchasing the product.

[0115] The container may be equipped with a dispensing member. A dispensing member may refer to a member for taking the contents inside the container and applying them to the skin. In the present invention, the dispensing member may have a structure capable of simultaneously contacting a lower layer, a middle layer, and an upper layer. When the dispensing member contacts multiple layers simultaneously, the contents of each layer may be attached to the surface of the dispensing member in correspondence with the layer positions. In this state, when the dispensing member is applied to the lips or cheeks, multiple colors attached to the surface of the dispensing member naturally blend on the skin, thereby realizing a gradient color effect. Gradient color effect refers to a color effect in which the shade of the color gradually changes with a single application motion. Accordingly, the user can achieve natural ombré makeup without the need for separate layering work or the simultaneous use of other color products.

[0117] According to one embodiment, the application member includes a stick-type applicator integrally coupled to a cap mounted at the opening of a container, and the stick-type applicator has a length that extends through the lower layer, middle layer, and upper layer inside the container while the cap is fastened to the container, and the tip of the stick-type applicator has one or more application surfaces among a flocked fiber layer, a sponge, or a silicone tip, and the application surface contacts the contents of the lower layer, middle layer, and upper layer respectively, so that the color of the lower layer, the color of the middle layer, and the color of the upper layer are sequentially attached along the length direction of the application surface, thereby enabling gradient color development with a single stroke when applied to the lips or cheeks, and the lower layer, middle layer, and upper layer have substantially the same composition of an oil-phase gel matrix so that the density difference between each layer is 0.05 g / cm³ or less, and the yield stress of each layer is maintained at 10 Pa or more by the gel network formed within each layer by the oil-phase gelling agent, thereby suppressing interlayer flow mixing due to self-weight at room temperature, and the lower layer, middle layer and The interlayer interface between the upper layers can be configured so that the ombré appearance is maintained for more than 6 months under room temperature storage conditions after manufacturing, by suppressing interfacial instability through the same density and refractive index of the oil-phase gel matrix.

[0118] In one embodiment of the present invention, the dispensing member may include a stick-type applicator integrally coupled to a cap mounted in the opening of a container. A stick-type applicator may refer to a dispensing tool comprising a rod-shaped shaft and a dispensing surface formed at the tip thereof. Being integrally coupled to a cap may refer to a structure in which the upper end of the shaft of the stick-type applicator is fixed to the inside of the cap, so that when the cap is separated from the container, the stick-type applicator is withdrawn from the container together with the cap.

[0119] A stick-type applicator may have a length that extends through the lower, middle, and upper layers inside the container while the cap is attached to the container. This may mean that the axial length of the stick-type applicator is set to be equal to or greater than the height of the entire contents stacked inside the container. Due to this length setting, the application surface of the stick-type applicator can maintain contact with the contents across the entire layer from the lower layer to the upper layer while the cap is attached. Therefore, when the cap is removed and the stick-type applicator is withdrawn, the contents of the lower, middle, and upper layers may already be attached to the application surface in corresponding to the layer positions.

[0120] The tip of the stick-type applicator may be provided with an application surface. The application surface is a part that performs the function of picking up the contents and delivering them to the skin, and may be composed of one or more of a flocked fiber layer, a sponge, or a silicone tip. The flocked fiber layer is an application surface formed by implanting fine fibers onto the surface of the shaft using methods such as electrostatic implantation, and allows for uniform application by retaining the contents in the fine spaces between the fibers. The sponge is a porous elastomer that provides a soft application sensation due to its excellent absorption and release characteristics of the contents. The silicone tip is a non-porous elastomer that allows for efficient application with a small amount due to its low absorption of contents. The material of the application surface may be appropriately selected according to the product's feel and application characteristics, and is not limited to the materials listed above.

[0121] The application surface comes into contact with the contents of the lower, middle, and upper layers, respectively, allowing the colors of the lower, middle, and upper layers to be sequentially attached along the longitudinal direction of the application surface. This implies that the contents of the lower layer are attached to the bottom area of ​​the application surface, the contents of the middle layer to the middle area, and the contents of the upper layer to the top area, corresponding to their respective positions. When a user applies the application surface in this state to the lips or cheeks with a single stroke, multiple colors attached along the longitudinal direction of the application surface can be sequentially transferred onto the skin. A single stroke refers to the action of applying with a single continuous movement while keeping the application surface in close contact with the skin. Through this single-stroke application, the user can achieve a natural gradient color without the need for separate blending or layering techniques. The boundaries between the colors attached to each area of ​​the application surface naturally blend during the application process, allowing for a smooth color transition on the skin.

[0123] According to one embodiment, the multilayer cosmetic composition is formed by stacking by a sequential filling and partial setting process, and the sequential filling and partial setting process comprises the steps of: preparing a common base batch including a non-volatile oil phase base, an oil phase gelling agent, a volatile solvent, and an oil phase dispersant; dividing the common base batch into multiple parts and introducing a coloring component package and an optical control component package different for each layer into each divided part to prepare a composition for the lower layer, a composition for the middle layer, and a composition for the upper layer, respectively; a first partial setting step of curing the surface of the lower layer by evaporating a portion of the volatile solvent after filling the composition for the lower layer into a container; a second partial setting step of curing the surface of the middle layer by evaporating a portion of the volatile solvent after filling the composition for the middle layer onto the cured lower layer; and filling the composition for the upper layer onto the cured middle layer. The composition may be configured such that interfacial mixing with the subsequently filled layer is suppressed by surface curing in the first and second partial setting steps, thereby ensuring clarity of the interlayer boundary.

[0124] In one embodiment of the present invention, the lower layer, middle layer, and upper layer have substantially the same composition of the oil-phase gel matrix, so that the density difference between each layer may be 0.05 g / cm³ or less. A density difference of 0.05 g / cm³ or less may mean that the density difference between two adjacent layers is maintained at or below that value. In a multilayer stacked structure, if the density difference between adjacent layers is large, the layer with higher density may sink downward due to gravity or the layer with lower density may rise upward, causing the interlayer positions to be reversed or the interface to collapse. By maintaining the density difference at 0.05 g / cm³ or less, the buoyancy or sinking driving force due to gravity is suppressed to a level sufficiently small compared to the yield stress of the gel network, thereby ensuring interlayer positional stability. This minimization of density difference can be achieved by the common base arrangement method described above, and since the weight ratio of the coloring component and the optical control component in the total composition is relatively small, density fluctuations caused by their layer-by-layer differences can be managed within the above range. However, the value of 0.05 g / cm³ corresponds to a preferred range of embodiment and can be appropriately adjusted depending on the specific gravity of the raw material used and the content of the coloring component.

[0125] The yield stress of each layer can be maintained at 10 Pa or higher by the gel network formed within each layer by the oil-phase gelling agent. A yield stress of 10 Pa or higher implies that if a stress of less than 10 Pa is applied to each layer, the layer does not flow and maintains a semi-solid state. At room temperature, the stress applied to each layer by self-weight can be determined by the product of the layer height, density, and gravitational acceleration. Considering the container size and content density of typical lip and cheek products, the stress due to self-weight may correspond to the level of several Pa. Therefore, if the yield stress is maintained at 10 Pa or higher, the stress due to self-weight does not exceed the yield stress, thereby suppressing phenomena where each layer flows due to self-weight or penetrates into adjacent layers. The magnitude of the yield stress can be controlled by the content of the oil-phase gelling agent and the degree of development of the gel network. The yield stress may increase as the content of the gelling agent increases or as cooling conditions become more favorable for gel network formation. However, if the yield stress is excessively high, it may be difficult to extract the contents using the coating material or the spreadability on the skin may be reduced; therefore, it may be desirable to set it within an appropriate range by considering the balance between usability and interlayer stability.

[0126] The suppression of interfacial instability at the interlayer interface between the lower, middle, and upper layers means that phenomena such as the contents of one layer penetrating into another layer or the interface becoming irregularly deformed do not occur at the interface between two adjacent layers. Interfacial instability can generally be caused by differences in density, refractive index, or interfacial tension between two adjacent phases. In the present invention, since the composition of the oil-phase gel matrix of each layer is substantially the same, the density and refractive index between adjacent layers can be substantially the same. Consequently, Rayleigh-Taylor instability caused by density differences or interfacial deformation caused by refractive index differences can be suppressed. Furthermore, since the two adjacent layers are based on the same oil-phase medium, phase separation does not occur at the interface, thereby maintaining the structural integrity of the interface.

[0127] The statement that the ombré appearance is maintained for at least 6 months under room temperature storage conditions after manufacturing may mean that the clarity of the interlayer boundaries and the distinction of the ombré color are maintained at a level visually perceptible to consumers for a period of at least 6 months while the product is stored in a room temperature environment (e.g., about 15 to 30°C) from the time the product is completed. This long-term stability can be achieved through the combined action of imparting yield stress by a gel network, suppressing buoyancy / sedimentation by minimizing density differences, and suppressing color shift by a particle-dispersed coloring method. The period of 6 months may be based on the distribution and consumption cycle of general cosmetic products, and the actual period of stability may vary depending on conditions such as storage temperature, humidity, and the sealability of the container. The figure of 6 months above corresponds to a preferred embodiment, and stability for a longer period may be ensured through formulation design and process optimization.

[0128] In one embodiment of the present invention, the multilayer cosmetic composition may be formed by stacking through sequential filling and partial setting processes. Sequential filling may refer to a process of injecting a plurality of layer compositions into a single container in stages, one layer at a time, from the lower layer to the upper layer, rather than injecting them all at once. Partial setting may refer to a process of curing the surface of a previously filled layer to a certain level to suppress interfacial mixing with the subsequent layer after the filling of each layer is completed and before filling the subsequent layer.

[0129] The specific method of performing the sequential filling and partial setting process may be as follows. First, a common base batch comprising a non-volatile oil phase base, an oil phase gelling agent, a volatile solvent, and an oil phase dispersant may be prepared. The method of preparing the common base batch and its technical significance may be the same as those previously described regarding the composition.

[0130] Subsequently, by dividing a common base batch into multiple parts and introducing different coloring component packages and optical control component packages into each divided part for each layer, a composition for the lower layer, a composition for the middle layer, and a composition for the upper layer can be prepared, respectively. When preparing the composition for each layer, sufficient stirring and dispersion can be performed after introducing the coloring component and the optical control component so that pigment particles are uniformly distributed within the oil-phase gel matrix.

[0131] After filling the lower layer composition into a container, a first partial setting step may be performed. In the first partial setting step, a portion of the volatile solvent may be allowed to evaporate from the surface of the filled lower layer composition. To this end, the filled container may be left at room temperature for a predetermined time, or volatilization may be promoted by applying weak airflow or heating conditions. When a portion of the volatile solvent evaporates, the concentration of the effective gelling agent of the oil-phase gel matrix near the surface of the lower layer increases, thereby increasing the gel strength in that region. As a result, the surface of the lower layer hardens, and the phenomenon of mixing between the lower layer and the middle layer at the interface due to the load or injection shock of the middle layer composition subsequently injected can be suppressed. Here, surface hardening does not mean that the entire layer is completely solidified, but rather that the gel strength near the surface rises to a level capable of suppressing mixing with the subsequent layer. The conditions for partial setting can be appropriately set according to the boiling point and content of the volatile solvent used, the opening area of ​​the container, ambient temperature and humidity, etc.

[0132] After the first partial setting is completed, the middle layer composition can be filled onto the cured lower layer. When filling the middle layer composition, the injection speed and injection method can be controlled to prevent excessive mechanical impact from being applied to the surface of the lower layer. As a result, the cured state of the lower layer surface secured by the partial setting is maintained, allowing the middle layer to be stably laminated thereon. Once the filling of the middle layer composition is completed, the second partial setting step can be performed in the same manner to cure the surface of the middle layer.

[0133] After the second part setting is completed, the composition for the upper layer can be filled onto the cured middle layer. Since the upper layer is the top layer, there is no subsequent filling, so additional part setting may not be essential; however, to ensure the gel strength of the final product, it may be left at room temperature for a sufficient amount of time after filling is completed to induce further evaporation of residual volatile solvents.

[0134] Through this sequential filling and partial setting process, mixing of the contents at the interface between each layer is suppressed, thereby ensuring the clarity of the interlayer boundaries. The clarity of the interlayer boundaries refers to the degree to which the color transitions abruptly at the boundary between two adjacent layers, allowing the two layers to be visually clearly distinguished. The higher the boundary clarity, the higher the visual perfection of the ombré appearance. If multiple compositions are injected simultaneously without sequential filling, or if filling is performed continuously without partial setting, the contents may mix at the interlayer boundaries, resulting in unclear boundaries or turbid colors. The sequential filling and partial setting process of the present invention prevents these problems, thereby enabling the manufacture of a multilayer lip and cheek product having clear interlayer boundaries and a distinct ombré appearance.

[0135] Specific process parameters such as the number of partial settings, the time and conditions of each setting, and the filling speed in the above process can be appropriately adjusted according to the physical properties of the raw materials used, the shape and size of the container, the target interlayer boundary clarity, etc., and the method described above corresponds to one embodiment and is not limited thereto.

[0137] In a multilayer cosmetic composition according to one embodiment of the present invention, the gel strength of the oil phase gel matrix in the lower layer, middle layer, and upper layer may be set to be progressively different from the lower layer in the direction of the upper layer. Specifically, the gel strength of the lower layer may be set higher than the gel strength of the upper layer.

[0138] Gel strength refers to the degree of structural rigidity formed by a gel network within an oil-phase gel matrix; the higher the gel strength, the greater the resistance of the layer to external stress and the greater the degree to which flow is inhibited. Gel strength can be controlled by the content of the oil-phase gelling agent, the residual amount of volatile solvent, or the ratio thereof. As the content of the oil-phase gelling agent increases, the density of crosslinking points in the gel network increases, which can lead to an increase in gel strength, and as the residual amount of volatile solvent decreases, the effective concentration of the gel network increases, which can lead to an increase in gel strength.

[0139] The technical intention behind setting the gel strength of the lower layer higher than that of the upper layer may be based on the consideration of the structural role of the lower layer in a laminated filling structure, where it must support the load of the upper and middle layers. If the gel strength of the lower layer is relatively high, the phenomenon of the lower layer undergoing compressive deformation or the interface with the middle layer collapsing can be suppressed even when downward pressure is applied due to the self-weight of the middle and upper layers. Conversely, if the gel strength of the upper layer is relatively low, it may be easier to extract the contents using a coating member. Since the contents of the upper layer adhere to the coating surface first when the coating member is inserted into the container and comes into contact with the contents, the lower the gel strength of the upper layer, the easier the extraction can be.

[0140] This differential setting of gel strength by layer can be achieved by varying the amount of volatile solvent added to each divided portion in a common base batch method for each layer, or by adjusting the content of the oil-phase gelling agent within a minute range for each layer. For example, a volatile solvent may be added to the composition for the lower layer at a relatively low ratio, and a volatile solvent may be added to the composition for the upper layer at a relatively high ratio. When the volatile solvent evaporates after filling, the final gel strength of each layer is determined. Since the lower layer has a low initial volatile solvent content, the effective concentration of the gel network remains high even after evaporation, so the gel strength can be maintained at a high level; conversely, since the upper layer has a high initial volatile solvent content, the gel strength may remain relatively low due to residual solvent even after partial evaporation.

[0141] In addition, a gradual gradient of gel strength by layer may naturally form during the sequential filling process. Since the lower layer is filled first and the volatile solvent evaporates over the longest period, it may have the lowest amount of residual volatile solvent and the highest gel strength. Conversely, since the upper layer is filled last and has the shortest evaporation time, it may have a relatively high amount of residual volatile solvent and a relatively low gel strength. Due to these process characteristics, a natural gel strength gradient caused by the time difference of sequential filling can be formed without any separate compositional change.

[0142] Due to this gel strength gradient, the lower layer secures structural support, maintaining the shape of the interlayer boundary even during long-term storage, while the upper layer ensures ease of collection by the coating material, thereby improving usability. Furthermore, the gel strength of the middle layer is at an intermediate level between the lower and upper layers, allowing for a gradual change in gel strength at the interlayer boundary. Compared to cases where gel strength changes abruptly between layers, having a gradual gradient alleviates stress concentration at the boundary, thereby improving the long-term stability of the boundary.

[0143] The differential setting of gel strength by layer described above can be achieved within a range where the composition of the oil phase gel matrix is ​​substantially the same in each layer. Since the difference in the content of volatile solvents is negligible in proportion to the total weight of the composition, it may not have a substantial effect on the difference in density and refractive index between layers. Therefore, the formation of a gel strength gradient may not conflict with the basic design principles of the present invention, which are interlayer property uniformity and the minimization of density differences.

[0145] FIG. 5 is a schematic exploded perspective view of a multilayer lip and cheek product according to one embodiment of the present invention.

[0146] Referring to FIG. 5, a lip and cheek product according to one embodiment of the present invention includes a main body part (510) having a receiving space formed inside, and a lid part (520) coupled to the upper opening of the main body part (510) to seal the container and simultaneously extract the contents.

[0147] The main body (510) is formed from a transparent or translucent synthetic resin material such as glass, acrylic, PCTG, or PETG, so that the color and layered structure of the contents contained inside can be intuitively perceived from the outside. As shown in the drawing, the multilayer cosmetic composition described above is sequentially stacked and filled in the internal receiving space of the main body (510) in three layers: a lower layer, a middle layer, and an upper layer. Since each layer is manufactured by varying only the pigments and optical control components based on a common anhydrous oil-phase gel matrix base, there is substantially no difference in interlayer density or refractive index. Accordingly, interlayer flow mixing caused by self-weight or external impact is suppressed even during long-term storage, and a distinct and aesthetic ombré appearance can be stably maintained when observed from the outside of the main body (510). Screw threads for fastening with the lid (520) may be formed on the upper neck portion of the main body (510).

[0148] The lid portion (520) has a cap structure that is fastened to the opening of the main body portion (510) by a screw connection method, and includes a rod-shaped stick portion extending downward toward the interior of the main body portion (510) at its inner center, and an applicator member coupled to the end of the stick portion to directly hold the contents and deliver them to the skin. The applicator member may be composed of one or more of a flocked fiber tip, a sponge, or a silicone material that has low skin irritation and excellent absorption and spreadability of the contents, and may have a diagonal or streamlined cross-sectional shape to adhere to the curves of the lips or cheeks.

[0149] In particular, when the lid portion (520) is attached to the main body portion (510) in a storage state, the stick portion including the coating member is positioned to vertically penetrate the stacked upper, middle, and lower layers. When the user opens the lid portion (520) for makeup and takes out the coating member outside the main body portion (510), the formulations having different colors from the lower, middle, and upper layers are sequentially applied along the longitudinal surface of the coating member.

[0150] The user can easily achieve a very natural and beautiful gradient color by applying the three layers of color transferred to the coating material to the lips or cheeks with a single touch (single stroke) without any separate color mixing or layering techniques.

[0151] In a multilayer cosmetic composition according to one embodiment of the present invention, the optical control component included in each layer can be set differently in terms of not only content but also particle size for each layer. Specifically, by varying the particle size of synthetic fluorophlogopite for each layer, the texture and light reflection characteristics of the pearl effect expressed in each layer can be realized differently.

[0152] Synthetic fluorophlogopite is a synthetic mica having a plate-like crystal structure that can perform the function of imparting a pearl effect and luster by reflecting incident light from its crystal planes. At this time, the characteristics of the reflected light may vary depending on the particle size of the synthetic fluorophlogopite. When the particle size is large, the reflective surface of individual particles is wide, so the reflected light is strong and a distinct pearl effect can be expressed, and a sparkle at a level where pearl particles are perceptible to the naked eye may appear. Conversely, when the particle size is small, the reflective surface is fine, so the reflected light is dispersed, and a soft, subtle luster may be expressed, and an overall effect close to a satin texture may appear.

[0153] In the present invention, by utilizing the difference in light reflection characteristics according to particle size, visual differentiation can be added to each layer through differences in texture of the pearl effect, in addition to the difference in color intensity caused by the coloring component and titanium dioxide. For example, in a layer exhibiting a bright color, synthetic fluorophlogopite with a relatively large particle size can be included to further emphasize the sense of brightness through strong pearl shimmer. In a layer exhibiting a dark color, synthetic fluorophlogopite with a relatively small particle size can be included, or the content of synthetic fluorophlogopite can be set low so that the original dark hue of the pigment is highlighted while the pearl effect is suppressed. In a layer of intermediate tone, medium-sized particles can be included, or a mixture of large and small particles can be used to achieve an intermediate level of pearl effect.

[0154] Due to the differential blending of particle sizes in each layer, users can perceive not only differences in color intensity but also changes in gloss and texture layer by layer when observing the product, thereby enhancing visual differentiation between layers. Compared to cases where layers are distinguished solely by differences in color intensity, the addition of texture differences with a pearl effect amplifies the perceived color difference between adjacent layers, thereby improving the visual completeness of the ombré appearance.

[0155] In addition, the difference in pearl effect between layers can be expressed directly on the skin even upon application. When multiple layers of the contents are applied to the skin by an application device, strong pearl shimmer appears in the light color range, and a soft gloss appears in the dark color range, allowing for the simultaneous realization of a gloss gradient beyond a simple color gradient. As a result, users can obtain a three-dimensional makeup effect in which color and texture change simultaneously with a single product.

[0156] Differential mixing of particle sizes by layer can be achieved by selecting different particle size grades of synthetic fluorophlogopite for each layer in the optical control component package introduced into each divided portion after dividing a common base batch. Since synthetic fluorophlogopite is generally supplied in multiple grades classified according to particle size during manufacturing, this can be sufficiently achieved by selecting and introducing a grade suitable for each layer. In this case, since synthetic fluorophlogopite is a solid in the form of particles, it is dispersed within the oil-phase gel matrix and trapped in the gel network, thereby inhibiting its movement to adjacent layers. Therefore, even if different particle sizes are mixed by layer, the phenomenon of particle sizes mixing or becoming homogenized between layers during storage may not occur.

[0157] The differential blending of particle sizes described above is not limited to synthetic fluorophlogopite, and the same principle may be applied to methods of varying the particle sizes of titanium dioxide or other optical control components layer by layer. The specific range of particle sizes and combinations of layer settings can be freely adjusted according to the visual characteristics of the desired ombre effect, and the method described above corresponds to one embodiment and is not limited thereto.

[0159] Although the embodiments have been described above with reference to the limited drawings, those skilled in the art can apply various technical modifications and variations based on the above. For example, suitable results may be achieved even if the described techniques are performed in a different order than described, and / or if the components of the described system, structure, device, circuit, etc. are combined or assembled in a form different from described, or replaced or substituted by other components or equivalents.

Claims

Claim 1 A multilayer cosmetic composition formed by stacking and filling within a container to form a visually distinguishable plurality of layers, wherein the composition comprises a lower layer, a middle layer, and an upper layer, and each of the lower layer, middle layer, and upper layer comprises an oil-phase gel matrix comprising a non-volatile oil-phase base, an oil-phase gelling agent, and a volatile solvent, and one or more of a coloring component and an optical control component dispersed within the oil-phase gel matrix, wherein the composition of the oil-phase gel matrix is ​​the same for the lower layer, middle layer, and upper layer, and the type or content of one or more of the coloring component and the optical control component differs layer by layer for the lower layer, middle layer, and upper layer, so that each layer exhibits a different color, brightness, or saturation, and the oil-phase gelling agent forms a gel network within the oil-phase gel matrix to suppress the flow of each layer, thereby preventing interlayer mixing. Claim 2 In claim 1, the non-volatile oil phase base comprises hydrogenated poly(C6-14 olefin) and is included in an amount of 60 to 80 weight% based on the total weight of the composition, and the oil phase gelling agent comprises hydrogenated styrene / isoprene copolymer and is included in an amount of 3 to 10 weight% based on the total weight of the composition, thereby forming a gel network by physical crosslinking within the non-volatile oil phase base to impart yield stress to each layer and suppress interlayer flow mixing caused by self-weight and external impact, and the volatile solvent comprises isododecane and is included in an amount of 2 to 8 weight% based on the total weight of the composition, thereby temporarily reducing the viscosity of the oil phase gel matrix upon filling and hardening the surface of each layer by volatilization after filling, and the oil phase gel matrix further comprises polyglyceryl-2 triisostearate as an oil phase dispersant in an amount of 5 to 15 weight% based on the total weight of the composition, and the coloring component and optical control component are the A multilayer cosmetic composition that is uniformly dispersed within an oil-phase base and inhibits the sedimentation of pigment particles and interlayer color shift. Claim 3 In claim 1, the coloring component comprises one or more of an inorganic pigment, an organic pigment, and a dye; the inorganic pigment comprises one or more of red iron oxide, yellow iron oxide, and black iron oxide and is fixed within the oil gel matrix in a particle-dispersed form to suppress interlayer migration; the organic pigment comprises one or more lake pigments of Red 201, Red 202, and Red 104 (1); the dye comprises one or more of Yellow 4, Yellow 5, and Blue 1; the optical control component comprises one or more of titanium dioxide, which performs brightness control and opacity, and synthetic fluorophlogopite, which imparts light reflection and a pearl effect; the layer exhibiting a relatively bright color among the lower layer, middle layer, and upper layer has a titanium dioxide content of 0.5% by weight or more based on the weight of the layer and a combined content of the inorganic pigment and organic pigment of less than 0.5% by weight based on the weight of the layer; and the layer exhibiting a relatively dark color has a titanium dioxide content of the layer A multilayer cosmetic composition having less than 0.5 weight% based on weight and a combined content of the inorganic pigment and organic pigment of 0.5 weight% or more based on the weight of the layer. Claim 4 A multilayer cosmetic composition according to claim 3, wherein the lower layer, middle layer, and upper layer are manufactured by dividing from a common base batch in which the composition of the non-volatile oil-phase base, oil-phase gelling agent, volatile solvent, and oil-phase dispersant is the same between each layer, wherein the common base batch is divided into multiple parts and then a coloring component package and an optical control component package different for each layer are introduced into each divided part to determine the color of each layer, wherein the coloring component package for each layer has a combination of the types and contents of the inorganic pigment, organic pigment, and dye set differently for each layer, and the optical control component package for each layer has a content ratio of titanium dioxide and synthetic fluorophlogopite set differently for each layer, so that the lower layer, middle layer, and upper layer form an ombre effect in which they are visually distinguished in one or more of brightness, saturation, and hue, and wherein the density difference and refractive index difference between each layer are minimized by the use of the common base batch, thereby ensuring long-term stability of the interlayer boundary. Claim 5 A lip and cheek product comprising a transparent or translucent container and a multilayer cosmetic composition contained within the container, wherein the multilayer cosmetic composition comprises a lower layer, a middle layer, and an upper layer sequentially stacked and filled from the bottom to the top of the container, and each of the lower layer, middle layer, and upper layer comprises an oil-phase gel matrix comprising a non-volatile oil-phase base, an oil-phase gelling agent, and a volatile solvent, and one or more of a coloring component and an optical control component dispersed within the oil-phase gel matrix to impart different colors to each layer, and wherein the lower layer, middle layer, and upper layer form an ombré appearance of different colors, and wherein the container is provided with a dispensing member, and wherein a gradient color is achieved by the dispensing member simultaneously contacting the lower layer, middle layer, and upper layer to mix and apply the contents of multiple layers, and wherein the dispensing member includes a stick-type applicator integrally coupled to a cap mounted on the opening of the container, and wherein the stick-type applicator is in a state where the cap is fastened to the container It has a length that extends through the lower, middle, and upper layers inside, and the tip of the stick-type applicator has one or more application surfaces among a flocked fiber layer, a sponge, or a silicone tip, and the application surface contacts the contents of each of the lower, middle, and upper layers, so that the color of the lower layer, the color of the middle layer, and the color of the upper layer are sequentially attached along the length direction of the application surface, thereby enabling gradient color development with a single stroke when applied to the lips or cheeks, and the lower, middle, and upper layers have the same composition of the oil-phase gel matrix so that the density difference between each layer is 0.A lip and cheek product characterized by having a yield stress of 0.5 g / cm³ or less, and a yield stress of each layer maintained at 10 Pa or more by a gel network formed within each layer by the oil-phase gelling agent, thereby suppressing interlayer flow mixing due to self-weight at room temperature, and interlayer interface between the lower layer, middle layer, and upper layer suppressing interlayer instability by the same density and refractive index of the oil-phase gel matrix, so that an ombré appearance is maintained for 6 months or more under room temperature storage conditions after manufacturing.

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