2-layer cosmetic composition having excellent foaming properties

Abstract

The present invention relates to a bilayer cosmetic composition, and more specifically, to a bilayer cosmetic composition in which foaming power and formulation stability are improved through a combination of a specific surfactant and an emulsifier.

Description

Technology Field

[0001] The present invention relates to a bilayer cosmetic composition, and more specifically, to a bilayer cosmetic composition with improved foaming power through a combination of a specific surfactant and an emulsifier. Background Technology

[0002] Conventionally, to implement foam formulations in leave-on type formulations, monolayer formulations containing surfactants to minimize skin irritation have been widely used. While these formulations have the advantages of being relatively simple in composition and manufacturing and ensuring stability, the fact that the formulation structure consists of a single phase makes it difficult to differentiate appearances in terms of visual and sensory aspects. Furthermore, the limited formulation diversity has resulted in limitations in realizing various textures or functions. As another method of foam formation, formulations have been proposed that utilize a composition containing carbonated water or carbonates to generate carbon dioxide (CO₂) and form foam during the process of application to the skin or pumping. However, this method is also mostly based on a monolayer structure, and since the foam generation principle relies on chemical gas generation, there have been limitations in terms of formulation stability and the reproducibility of foam formation under usage conditions.

[0003] Recently, there has been an increasing consumer demand in the cosmetics market for unique formulations that provide not only simple functionality but also visual differentiation and sensory experiences during use. However, conventional foam-forming cosmetic compositions are mostly limited to monolayer structures, which has made it difficult to fully satisfy these consumer demands.

[0004] Accordingly, the inventors have completed a cosmetic formulation with a new structure capable of simultaneously realizing the specific appearance of the formulation and the foaming characteristics upon use. Prior art literature

[0005] (Patent Document 0001) KR 10-2018-0133170 A The problem to be solved

[0006] The present invention aims to provide a cosmetic composition that implements a bilayer formulation while improving foaming power upon dispensing.

[0007] The technical problems of the present invention are not limited to those mentioned above, and other unmentioned technical problems will be clearly understood by those skilled in the art from the description below. means of solving the problem

[0008] According to an embodiment of the present invention, a bilayer cosmetic composition may be provided, wherein the cosmetic composition comprises a nonionic surfactant and an emulsifier, and the nonionic surfactant comprises at least one of octyldodeceth and C12-14 Alketh-12.

[0009] In addition, the emulsifier may include at least one selected from the group consisting of trilaureth-4 phosphate, lysolecithin, hydroxylated lecithin, hydrogenated lecithin, and lecithin.

[0010] In addition, the nonionic surfactant may be included in an amount of 0.03 to 1.5 weight% based on the total weight of the cosmetic composition.

[0011] In addition, the emulsifier may be included in an amount of 0.08 to 1.8 weight% based on the total weight of the cosmetic composition.

[0012] In addition, the cosmetic composition may be characterized by being composed of an upper layer of a milky white cream liquid formulation; and a lower layer consisting of an aqueous phase of a transparent or translucent liquid formulation.

[0013] In addition, the above cosmetic composition may have excellent foaming power.

[0014] In addition, the above cosmetic composition may have excellent formulation stability. Effects of the invention

[0015] The cosmetic composition according to the present invention can stably implement a bilayer formulation consisting of an upper layer of a cream formulation and a lower layer composed of an aqueous phase, while also providing a cosmetic composition with excellent foaming power when dispensed. Brief explanation of the drawing

[0016] A brief description of each drawing is provided to help to better understand the drawings cited in the detailed description of the invention. Figure 1 is a photograph showing the separation ability of Example 1, which is separated into a two-layer structure consisting of an upper layer and a lower layer composed of an upper layer and an aqueous layer, even after mixing the upper and lower layers. Specific details for implementing the invention

[0017] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by a skilled expert in the art to which the present invention pertains. In general, the nomenclature used herein is well known and commonly used in the art. Furthermore, in describing embodiments of the present invention, detailed descriptions of related known components or functions are omitted if it is determined that such detailed descriptions would hinder understanding of the embodiments of the present invention. Additionally, while embodiments of the present invention will be described below, the technical concept of the present invention is not limited or restricted thereto and can be modified and implemented in various ways by those skilled in the art.

[0018] In this specification, when a part is described as including a certain component, it means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. In this specification, the term "and / or" includes a combination of a plurality of related items or any one of a plurality of related items.

[0020] According to an embodiment of the present invention, a bilayer cosmetic composition is provided comprising a nonionic surfactant and an emulsifier, wherein the nonionic surfactant comprises at least one of octyldodeceth and C12-14 Alketh-12.

[0021] In the present invention, the term “nonionic surfactant” refers to a surfactant that possesses both hydrophilic and hydrophobic groups simultaneously and does not ionize in an aqueous solution. The nonionic surfactant facilitates foam formation within the cosmetic composition of the present invention and can play a role in forming rich and dense foam upon contact with air during dispensing. In particular, when used in combination with the emulsifier of the present invention, the interfacial structure is formed more stably, thereby improving foam-forming ability and exhibiting a synergistic effect that demonstrates excellent foaming power during dispensing while maintaining a bilayer structure. In the present invention, the nonionic surfactant may comprise at least one of octyldodeceth and C12-14 Alketh-12.

[0022] In the present invention, “Octyldodeceth” refers to a nonionic surfactant containing both a hydrophobic alkyl chain and a hydrophilic group. In the cosmetic composition of the present invention, it stabilizes the interface between the liquid component and air through a surfactant action, thereby promoting the formation of fine and uniform foam upon dispensing and ensuring foam stability. In particular, when used in combination with the emulsifier of the present invention, it can maximize the stabilization of the interface structure and the improvement of foam-forming ability. Furthermore, it can contribute to suppressing the mixing of the upper and lower layers and improving the stability of the bilayer structure by forming a stable interface structure at the interface between the upper and lower layers. In the present invention, the Octyldodeceth may specifically be Octyldodeceth-16, but is not limited thereto.

[0023] In the present invention, “C12-14 Alketh-12” refers to a nonionic surfactant containing both a hydrophilic chain and a hydrophobic alkyl chain. In the cosmetic composition of the present invention, it can reduce interfacial tension and stabilize the interface between air and liquid phases to form abundant and dense foam upon dispensing. In particular, when used in combination with the emulsifier of the present invention, the formation of an interfacial film is achieved more stably, thereby simultaneously improving foam-forming ability and the stability of the bilayer formulation.

[0024] In the present invention, the nonionic surfactant may be included in an amount of 0.03 to 1.5 weight% based on the total weight of the cosmetic composition, specifically 0.04 to 1.5 weight%, and more specifically 0.05 to 1.5 weight%, but is not limited thereto. When the nonionic surfactant is included in the above amount, a cosmetic composition with excellent foaming power can be provided while stably implementing a bilayer formulation. On the other hand, if the nonionic surfactant is included in a small amount less than the above amount, the surfactant effect may not be sufficiently exerted, resulting in insufficient foam formation or reduced foaming power upon dispensing; and if the nonionic surfactant is included in an excessive amount more than the above amount, a bilayer structure may not be formed, such as the aqueous phase becoming suspended or the upper and lower layers mixing, or the stability of the bilayer structure may be reduced.

[0025] In the present invention, "emulsifier" refers to a substance that acts on the interface between the aqueous phase and the oil phase to stabilize mutual dispersion. In the present invention, it can play a role in stably maintaining a bilayer structure by forming a stable interfacial film between the cream layer of the upper layer and the aqueous layer of the lower layer. Additionally, when used in combination with the nonionic surfactant of the present invention, a synergistic effect can be exhibited in which the interfacial structure is further stabilized and abundant, dense foam is formed upon dispensing. In the present invention, the emulsifier may include, for example, one or more of trilaureth-4 phosphate, lysolecithin, hydroxylated lecithin, hydrogenated lecithin, and lecithin, but is not limited thereto.

[0026] In the present invention, the emulsifier may be included in an amount of 0.08 to 1.8 weight% based on the total weight of the cosmetic composition, specifically in an amount of 0.1 to 1.8 weight%, but is not limited thereto. When the emulsifier is included in the above amount, a cosmetic composition with excellent foaming power can be provided while stably implementing a two-layer formulation. On the other hand, if the emulsifier is included in a small amount less than the above amount, problems such as poor formulation stability may occur, such as failure to implement a two-layer formulation including the upper layer of the cream formulation or failure to maintain a two-layer structure may occur, and if the emulsifier is included in an excessive amount more than the above amount, problems may occur where the upper layer and the lower layer are mixed and a two-layer structure is not formed.

[0027] The cosmetic composition according to the present invention may be characterized by forming a bilayered formulation.

[0028] In the present invention, the term “bilayer” may refer to a structure in which two or more layers having different compositions or properties coexist in a state of being visually separated from each other, and each layer may be distinguished by differences in physical properties, composition, viscosity, etc. In the present invention, it may refer to a structure in which the upper layer is a cream formulation and the lower layer is an aqueous phase, but is not limited thereto. Specifically, the upper layer may be formed as a milky white cream formulation containing an oil phase component or an emulsion structure, and may exist in a liquid, viscous fluid, or semi-solid form having relatively high viscosity and structural stability, but is not limited thereto. The upper layer of such a cream formulation may provide physical stability in the upper region of the formulation by internally forming a certain structure by means of an oil phase component, an emulsion structure, or a viscosity-forming component, and may form a layer structure distinct from the aqueous phase of the lower layer.

[0029] Meanwhile, the lower layer of the present invention may be formed as an aqueous phase mainly containing water and may exist in a transparent or translucent liquid form having relatively low viscosity. The aqueous phase may include, as necessary, a moisturizer, a preservative, a thickening agent, a polyol, a water-soluble component, or other functional components, and may form a bilayer structure due to the difference in physical properties with the cream formulation of the upper layer.

[0030] The bilayer structure of the present invention allows two phases having different physical properties to coexist stably in a separated state, while the two phases may temporarily come into contact or mix due to shaking, stirring, or container dispensing during use. In particular, in the present invention, the interaction between the upper cream layer and the lower aqueous phase facilitates air incorporation during dispensing, thereby enabling the formation of rich and dense foam. The upper layer of the cream formulation can provide an interfacial structure that contributes to foam formation upon contact with air, and by working together with the lower aqueous phase, it can contribute to the formation of fine and dense foam during the dispensing process. Therefore, the bilayer structure of the present invention can be understood not merely as a structure in which two phases exist separately, but as a concept that includes a functional structure capable of exhibiting excellent foaming power through the interaction of the two phases during use.

[0031] Furthermore, in the present invention, the bilayer structure may include a characteristic in which the two phases can be separated back into an upper layer and a lower layer if left in a stationary state even after being temporarily mixed by external stimuli, and this characteristic may be expressed as "separation ability" in this specification. The separation ability may refer to the ability of the upper layer and the lower layer to spontaneously separate back into an upper layer and a lower layer due to differences in the physical properties of each phase if maintained in a stationary state for a certain period of time, even if the upper layer and the lower layer are temporarily mixed or dispersed by shaking, stirring, or a discharge process.

[0032] The above separation ability can serve as an important factor in ensuring the storage stability of the formulation. It may possess the characteristic that even if the two layers are temporarily mixed due to shaking or stirring during use, the upper and lower layers separate again upon being left undisturbed for a certain period, thereby maintaining the bilayer structure of the present invention. Accordingly, the cosmetic composition of the present invention can stably maintain its bilayer structure under various temperature conditions or storage environments, and simultaneously realize formulation characteristics that allow for mixing and use when necessary.

[0034] The cosmetic composition according to the present invention may be characterized by having excellent foaming power.

[0035] In the present invention, “foaming power” may refer to the ability to generate foam formed when air is incorporated into the composition when the cosmetic composition is dispensed from a container or when external stimuli such as rolling or rubbing are applied; in particular, it may include the ability to form foam with a rich, dense, and compact structure. In the present invention, the foaming power is not merely limited to the occurrence or quantity of foam, but may be a concept that comprehensively represents the amount of foam formed, the fineness of the bubbles, the density of the bubble structure, and the persistence and stability of the foam. For example, even if the same amount of foam is formed, it can be understood that foam exhibits superior foaming power as the bubbles are smaller, more uniform, and more densely arranged with each other.

[0036] Furthermore, in the cosmetic composition of the present invention, as air is incorporated during the dispensing process, the surfactant and emulsifier components within the composition adsorb to the interface between the air and the liquid phase, thereby reducing interfacial tension and facilitating the formation of bubbles. Additionally, by stabilizing the interface of the formed bubbles, a foam with a fine and dense structure can be formed. In particular, when having a bilayer structure consisting of an upper cream formulation and a lower aqueous phase as in the present invention, the two phases may temporarily come into contact or mix during the dispensing process, making air incorporation easier; consequently, a rich and elastic foam can be formed.

[0037] Furthermore, the foam formed as described above forms a soft and dense foam layer when applied to the skin or a target area, thereby improving the user experience and enhancing adhesion during the application process, and can maintain a stable foam state for a certain period of time even during use. Therefore, the foaming power in the present invention can be understood as a concept that includes not only the ease of foam generation but also the texture, structural stability, and persistence of the foam.

[0038] The cosmetic composition according to the present invention may be characterized by having excellent foam-forming ability when dispensed.

[0039] In the present invention, “foam-forming power upon dispensing” may refer to the ability to generate foam immediately without additional physical action, such as rubbing or friction, by inducing mixing with air or bubble formation during the process of dispensing a cosmetic composition by external pressure, pumping action, or internal pressure while the composition is contained in a pressurized container such as a pump container, an autoform container, or an aerosol container. In the present invention, foam-forming power upon dispensing may be a concept that comprehensively encompasses the speed of foam generation, the amount of foam generated, the fineness and uniformity of the bubbles, and the structural stability of the foam immediately after dispensing, which are formed during the dispensing process and at the moment of dispensing. This can be realized through the combination of the nonionic surfactant and emulsifier of the present invention.

[0041] The cosmetic composition according to the present invention may be characterized by excellent formulation stability.

[0042] In the present invention, “formulation stability” refers to the ability of a cosmetic composition to maintain its physical structure in a storage or usage environment, and includes the ability to stably maintain a bilayer structure consisting of an upper layer and a lower layer even under various temperature conditions such as low, room, and high temperatures. Furthermore, in the present invention, formulation stability may be used as a concept that includes “separability,” which is the ability of the cosmetic composition to separate back into an upper layer and a lower layer over time even after being temporarily mixed by external stirring or shaking. Through this separationability, the cosmetic composition of the present invention can maintain a stable bilayer structure even during long-term storage.

[0044] The above cosmetic composition may additionally include ingredients found in general cosmetic compositions, such as, for example, functional ingredients, purified water, thickeners, preservatives, moisturizers, polyols, oils, electrolyte compounds, ion chelating agents, disinfectants, pH adjusters, antioxidants, alcohols, fragrances, etc. The amounts of the above-mentioned ingredients are not particularly limited and can be easily selected by a person skilled in the art within a range that does not impair the purpose and effects of the present invention.

[0046] According to one embodiment, a cosmetic product comprising a cosmetic composition according to the present invention may be provided, and the contents of the cosmetic product may be dispensed by a pump or by pressurization, but are not limited thereto.

[0047] The cosmetic composition or cosmetic according to the present invention may be manufactured in any form of formulation and product commonly manufactured in the art, for example, in one or more formulations selected from the group consisting of serum, essence, mist, spray, mousse, body mist, skin lotion, skin toner, milk lotion, moisture lotion, nourishing lotion, massage cream, nourishing cream, moisture cream, hand cream, foundation, shampoo, hair treatment, hair essence, hair tonic, and hair mist, but is not limited thereto.

[0049] In the following, examples and experimental examples are presented to further explain the present invention in more detail, but the present invention is not limited thereto.

[0051] Experimental Example 1. Comparative experiment based on the inclusion of nonionic surfactants and emulsifiers

[0052] (1) Preparation of Examples and Comparative Examples

[0053] In order to confirm whether a bilayer formulation is formed, formulation stability, separation ability, and foaming power depending on whether the nonionic surfactant and emulsifier of the present invention are included, examples and comparative examples were prepared as shown in Table 1 below. The units in Table 1 below are weight%.

[0054]

[0055] The specific manufacturing method is as follows. According to Table 1 above, a certain amount of purified water, an oil phase component, and an emulsifier were mixed, and then HOMO stirring was performed at approximately 80°C to form a cream phase. Meanwhile, a certain amount of water phase component and a surfactant component were added to the remaining water, and a homogeneous aqueous solution was prepared separately by heating and stirring. Subsequently, the cream phase and the aqueous solution were mixed and thoroughly stirred, followed by a cooling process to complete each example and comparative example.

[0057] (2) Experimental results

[0058] For the above examples and comparative examples, the formation of a bilayer formulation, formulation stability, separation ability, and foaming power were evaluated.

[0059] Specifically, the evaluation of whether a bilayer formulation was achieved and the stability of the formulation was conducted by storing the completed examples and comparative examples for one month each under low temperature (5°C), room temperature (25°C), and high temperature (40°C) conditions, respectively, and visually observing whether a bilayer was formed immediately after completion, whether the bilayer formulation was maintained, and the stability of the formulation. If a stable bilayer state was maintained without changes such as the aqueous phase becoming suspended or the upper and lower layers becoming emulsified and mixed under the above temperature conditions, it was marked as 'O'; if a stable bilayer formulation was not formed, such as when the aqueous phase became suspended or the upper and lower layers became emulsified and mixed, or when the oil component separated in a band-like form in the cream layer, it was marked as 'X' and is shown in Table 2 below.

[0060] The separation ability evaluation was performed by thoroughly shaking the compositions of the completed examples and comparative examples to completely mix the upper and lower layers, then leaving them in a stationary state for one day to evaluate whether subsequent phase separation occurred. Cases where the upper and lower layers separated again were marked as 'O', and cases where the upper and lower layers remained mixed without separation or the aqueous phase was suspended were marked as 'X', as shown in Table 2 below.

[0061] Foaming power was evaluated by observing the degree of foam formation generated upon dispensing after filling each example and comparative example into an autofoam container. The results were rated as follows: 0 for no foam at all, 1 for insufficient foam, 2 for moderate foam, 3 for distinct foam, 4 for abundant foam, and 5 for dense and tight foam; a rating of 3 or higher was judged to indicate excellent foaming power.

[0063]

[0064] According to Table 2 above, in the case of Comparative Example 1, which does not include the nonionic surfactant and emulsifier components according to the present invention, it can be seen that a two-layer formulation in which the upper and lower layers are separated cannot be formed, and foam is not formed upon dispensing. In addition, in the case of Comparative Example 2, which includes the emulsifier according to the present invention but does not include the nonionic surfactant, a two-layer formulation is realized, but it can be seen that the degree of foam formation upon dispensing is significantly reduced compared to the example.

[0066] On the other hand, in the case of Example 1, which includes both a nonionic surfactant and an emulsifier according to the present invention, a bilayer formulation consisting of an upper layer of a cream formulation and a lower layer composed of an aqueous phase was realized, and it was confirmed that the bilayer formulation is maintained under low, room, and high temperature conditions, and it was confirmed that the formulation separates back into a bilayer even after the upper and lower layers are uniformly mixed by shaking. In addition, it was confirmed that a dense and tight foam can be formed upon dispensing.

[0068] Through this, it was confirmed that a stable bilayer formulation with excellent foaming power can be formed when both the nonionic surfactant and the emulsifier of the present invention are included, as in the example.

[0070] Experimental Example 2. Comparative experiment according to nonionic surfactant content

[0071] (1) Preparation of Examples and Comparative Examples

[0072] In order to confirm whether a bilayer formulation is formed, formulation stability, separation ability, and foaming power according to the nonionic surfactant content of the present invention, examples and comparative examples were prepared as shown in Table 3 below. The specific manufacturing method is the same as that of Experimental Example 1 above, and the units in Table 3 below are weight%.

[0073]

[0074] (2) Experimental results

[0075] For the above examples and comparative examples, the formation of a bilayer formulation, formulation stability, separation ability, and foaming power were evaluated in the same manner as in Experimental Example 1 and are shown in Table 4 below.

[0076]

[0077] According to Table 4 above, in the case of Comparative Example 3, which contains a small amount of nonionic surfactant compared to the Example, a bilayer formulation is realized, but it can be seen that the degree of foam formation upon dispensing is significantly lower than that of the Example. In addition, in the case of Comparative Example 4, which contains an excessive amount of nonionic surfactant compared to the Example, it can be seen that the aqueous phase exists in a suspended state, making it impossible to form a bilayer formulation in which the upper and lower layers are separated, and the degree of foam formation upon dispensing is also found to be significantly lower than that of the Example.

[0079] On the other hand, in the case of Examples 2 to 6, a bilayer formulation consisting of an upper layer of a cream formulation and a lower layer composed of an aqueous phase was implemented, and it was confirmed that the bilayer formulation was maintained under low, room, and high temperature conditions, and it was confirmed that the formulation separated back into a bilayer even after the upper and lower layers were uniformly mixed by shaking. In addition, it was confirmed that a rich foam or a dense, thick foam can be formed upon dispensing.

[0081] Through this, it was confirmed that a stable bilayer formulation with excellent foaming power can be formed when the nonionic surfactant of the present invention is appropriately included, as in the examples.

[0083] Experimental Example 3. Comparative experiment according to emulsifier content

[0084] (1) Preparation of Examples and Comparative Examples

[0085] In order to confirm whether a bilayer formulation is formed, formulation stability, separation ability, and foaming power according to the emulsifier content of the present invention, examples and comparative examples were prepared as shown in Table 5 below. The specific manufacturing method is the same as that of Experimental Example 1 above, and the units in Table 5 below are weight%.

[0086]

[0087] (2) Experimental results

[0088] For the above examples and comparative examples, the formation of a bilayer formulation, formulation stability, separation ability, and foaming power were evaluated in the same manner as in Experimental Example 1 and are shown in Table 6 below.

[0089]

[0090] According to Table 6 above, it can be confirmed that in the case of Comparative Example 5, which contains a small amount of emulsifier compared to the example, it is impossible to form a bilayer formulation including an upper layer of the cream formulation. In addition, in the case of Comparative Example 6, which contains an excessive amount of emulsifier compared to the example, it was found that it is impossible to form a bilayer formulation in which the upper and lower layers are separated.

[0092] On the other hand, in the case of Examples 7 to 10, a bilayer formulation consisting of an upper layer of a cream formulation and a lower layer composed of an aqueous phase was implemented, and it was confirmed that the bilayer formulation was maintained under low, room, and high temperature conditions, and it was confirmed that the formulation separated back into a bilayer even after the upper and lower layers were uniformly mixed by shaking. In addition, it was confirmed that a rich foam or a dense, tight foam can be formed upon dispensing.

[0094] Through this, it was confirmed that a stable bilayer formulation with excellent foaming power can be formed when the emulsifier of the present invention is appropriately included, as in the examples.

[0096] Foregoing, specific parts of the content of the present invention have been described in detail. It will be apparent to those skilled in the art that such specific descriptions are merely preferred embodiments and do not limit the scope of the present invention. Accordingly, the actual scope of the present invention is defined by the appended claims and their equivalents.

Claims

Claim 1 In a bilayer cosmetic composition, the cosmetic composition comprises a nonionic surfactant; A bilayer cosmetic composition comprising an emulsifier, wherein the nonionic surfactant comprises at least one of octyldodeceth and C12-14 Alketh-12, the emulsifier comprises at least one selected from the group consisting of trilaureth-4 phosphate, lysolecithin, hydroxylated lecithin, hydrogenated lecithin, and lecithin, the nonionic surfactant comprises 0.03 to 1.5 weight% based on the total weight of the cosmetic composition, and the emulsifier comprises 0.08 to 1.8 weight% based on the total weight of the cosmetic composition. Claim 2 delete Claim 3 delete Claim 4 delete Claim 5 A bilayer cosmetic composition according to claim 1, characterized in that the cosmetic composition comprises: an upper layer of a milky white cream liquid formulation; and a lower layer consisting of an aqueous phase of a transparent or translucent liquid formulation. Claim 6 In claim 1, the cosmetic composition is a two-layer cosmetic composition having excellent foaming power. Claim 7 In claim 1, the cosmetic composition is a two-layer cosmetic composition having excellent foam-forming ability upon dispensing. Claim 8 A cosmetic product comprising a two-layer cosmetic composition according to any one of claims 1 and 5 to 7, wherein the contents are dispensed by a pump or pressurization.

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