Multi-layered cosmetic composition

Abstract

The present invention relates to a multi-layered cosmetic composition comprising a first oil phase, a second oil phase and an aqueous phase, wherein the first oil phase contains a nonpolar oil, the second oil phase contains a polar oil, and the first oil phase, the second oil phase and the aqueous phase are separated into three layers. The cosmetic composition of the present invention stably forms a multi-layered structure and has excellent separation ability, and thus can be separated, after shaking, into multiple layers within a short time, thereby enabling both visual satisfaction coming from a formulation itself and satisfaction with respect to the excellence of the formulation coming from separation speed to be provided to a user. In addition, since readily soluble active ingredients can be mixed into each layer, various types of active ingredients can be applied to one cosmetic composition, and since the amount of a surfactant can be minimized, skin problems or skin irritation caused by the surfactant can be minimized.

Description

Multilayer cosmetic composition

[0001] The present invention relates to a multilayer cosmetic composition.

[0002] Recently, research is actively underway to develop cosmetics that not only enhance their functionality by varying active ingredients, but also differentiate them through unique formulations or appearances to attract consumer attention. As part of this effort, research is being conducted on multilayer structures that separate layers within the formulation to achieve visual differentiation.

[0003] Multilayered cosmetic compositions have the advantage of stabilizing different active ingredients that dissolve well in each layer, allowing a single formulation to deliver diverse skin benefits. A representative example of this type of multilayered composition, a two-layered cosmetic composition, offers the advantage of maintaining the skin's oil-water balance by providing both hydration and oiliness in a single formulation. Furthermore, multilayered cosmetics offer users a luxurious feel and visual satisfaction.

[0004] However, separating the layers within a formulation and maintaining this separation in a stable manner presents technical challenges. Furthermore, while most multilayered cosmetic compositions utilize surfactants, the growing negative perception of surfactant use in cosmetics has led to a growing demand for technologies capable of implementing multilayered formulations without surfactants.

[0005] Accordingly, the inventors of the present invention continued their research to implement a multilayered formulation that can be stably separated into multiple layers and visually differentiated, and as a result, they completed the present invention by manufacturing a multilayered cosmetic composition that can stably separate into three layers by utilizing the difference in specific gravity between the water phase and the oil phase and the difference in polarity between the oils that constitute the oil phase.

[0006] The purpose of the present invention is to provide a stable multilayer cosmetic composition.

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

[0008] According to an embodiment of the present invention, a multilayer cosmetic composition is provided, comprising a first oil phase; a second oil phase; and an aqueous phase; wherein the first oil phase includes a non-polar oil, the second oil phase includes a polar oil, and the first oil phase, the second oil phase, and the aqueous phase are separated into three layers.

[0009] The multilayer cosmetic composition of the present invention can be visually differentiated by being stably separated into three layers, and can provide a unique aesthetic feeling to the user.

[0010] The multilayered cosmetic composition of the present invention can incorporate easily soluble active ingredients into each layer, allowing for the application of a variety of active ingredients in a single cosmetic composition. Therefore, the diverse range of active ingredients can enhance the skin care efficacy of the cosmetic composition. Furthermore, the cosmetic composition of the present invention can simultaneously provide the moisturizing and oily sensations associated with skin and cream.

[0011] The multilayer cosmetic composition of the present invention mixes the components of each layer when the separated three-layer formulation is shaken. Due to its excellent separation ability, the composition can be separated into multiple layers again within a short period of time after shaking. This provides visual and usability enjoyment to the user.

[0012] The multilayer cosmetic composition of the present invention can minimize the content of surfactant, thereby reducing skin troubles or skin irritation caused by surfactant.

[0013] In order to more fully understand the drawings cited in the detailed description of the present invention, a brief description of each drawing is provided.

[0014] Figure 1 shows a photograph taken immediately after the manufacture of Example 1.

[0015] Figure 2 shows photographs of the formulation taken immediately after shaking Example 1, 30 seconds later, 60 seconds later, and 1 hour later.

[0016] According to an embodiment of the present invention, a multilayer cosmetic composition is provided, comprising a first oil phase; a second oil phase; and an aqueous phase; wherein the first oil phase includes a non-polar oil, the second oil phase includes a polar oil, and the first oil phase, the second oil phase, and the aqueous phase are separated into three layers.

[0017] The non-polar oil of the first oil phase may include a hydrocarbon-based oil.

[0018] The nonpolar oil of the first oil phase may include at least one of a C15-19 alkane and a hydrogenated poly(C6-15 olefin).

[0019] The polar oil of the second oil phase may include vegetable oil.

[0020] The above vegetable oil may have a monounsaturated fatty acid content of 87% by weight or more based on the total weight of the second oil phase.

[0021] The above vegetable oil may include castor oil.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention pertains. In general, the nomenclature used herein is well known and commonly used in the art. In addition, when describing embodiments of the present invention, if a detailed description of a related known structure or function is judged to hinder the understanding of the embodiments of the present invention, a detailed description thereof will be omitted. In addition, although embodiments of the present invention will be described below, the technical idea 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.

[0023] When a part in this specification is said to include a certain component, this does not exclude other components, unless otherwise specifically stated, but rather means that other components may be included. In this specification, the term "and / or" includes a combination of multiple related items or any one of multiple related items.

[0024]

[0025] The cosmetic composition of the present invention can form a stable multilayer formulation by separating the water phase and the oil phase due to the difference in specific gravity, and by separating into a first oil phase and a second oil phase due to the difference in polarity of the oil within the oil phase.

[0026] A multilayer cosmetic composition according to an embodiment of the present invention may include a first oil phase; a second oil phase; and an aqueous phase; wherein the first oil phase may include a nonpolar oil, the second oil phase may include a polar oil, and the first oil phase, the second oil phase, and the aqueous phase may be separated into three layers.

[0027]

[0028] The first oil phase included in the multilayer cosmetic composition of the present invention may correspond to an upper layer structure of the multilayer structure. The nonpolar oil included in the first oil phase may be positioned in an upper layer than the water phase due to its lower specific gravity than the water phase, and may be positioned in an upper layer than the second oil phase due to the difference in specific gravity arising from the difference in polarity between the vegetable oil of the second oil phase and the nonpolar oil, and may thus be positioned in an upper layer of the multilayer cosmetic composition.

[0029] In an embodiment, the non-polar oil included in the first oil phase may include a hydrocarbon oil. The hydrocarbon oil refers to a non-polar oil composed only of carbon (C) and hydrogen (H). The hydrocarbon oil may be any component that can be used in a cosmetic composition without limitation, and for example, at least one of liquid paraffin, hydrogenated polydecene, squalane, C15-19 alkane, and hydrogenated poly(C6-14 olefin) may be used, and specifically, at least one of C15-19 alkane and hydrogenated poly(C6-14 olefin) may be used. However, the present invention is not limited thereto.

[0030] In an embodiment, the first oil phase may be included in an amount of 1 to 35 wt%, specifically 2 to 33 wt%, and more specifically 3 to 30 wt%, based on the total weight of the multilayer cosmetic composition. If the first oil phase content is less than 1 wt%, the distinction between the upper layer and the middle layer may not be clear, and thus the multilayer formulation may not be clearly implemented. If the first oil phase content is more than 35 wt%, the light feeling of use of the nonpolar oil in the upper layer may be maximized, which may lower the feeling of use or cause a problem of lowering the stability of the formulation.

[0031]

[0032] The second oil phase included in the multilayer cosmetic composition of the present invention may correspond to a middle layer structure among the three-layer structures. The polar oil included in the second oil phase may be positioned in an upper layer than the water phase due to its lower specific gravity than the water phase, and may be positioned in a lower layer than the first oil phase due to the difference in specific gravity resulting from the difference in polarity with the nonpolar oil of the first oil phase, thereby being positioned in the middle layer of the multilayer cosmetic composition.

[0033] In an embodiment, the polar oil included in the second oil phase may include a vegetable oil.

[0034] In the embodiment, the vegetable oil may be selected from a vegetable oil having a high proportion of monounsaturated fatty acids (MUFAs). The term "monounsaturated fatty acid" refers to a fatty acid having only one carbon-carbon double bond in its fatty acid chain. An example of a monounsaturated fatty acid is ricinoleic acid.

[0035] In an embodiment, the vegetable oil may have a monounsaturated fatty acid content of at least 87 wt%, specifically at least 88 wt%, more specifically at least 89 wt%, and most specifically at least 90 wt%, based on the total weight of the second oil phase. If the monounsaturated fatty acid content is less than 87 wt% based on the total weight of the second oil phase, the formulation itself may not be formed, or the separation ability may be poor, resulting in separation in an undesirable form after shaking or separation at a very slow rate.

[0036] In an embodiment, the vegetable oil may include castor oil. Castor oil is a component having a composition ratio of ricinoleic acid, which corresponds to a monounsaturated fatty acid, of at least 90% by weight, and has a very high polarity due to the hydroxyl group (-OH) of the ricinoleic acid, so that it has high viscosity and specific gravity and can be fluid even at very low temperatures.

[0037] In an embodiment, the second oil phase may be included in an amount of 1 to 35 wt%, specifically 2 to 33 wt%, and more specifically 3 to 30 wt%, based on the total weight of the multilayer cosmetic composition. If the content of the second oil phase is less than 1 wt%, the distinction between the upper layer and the middle layer or the middle layer and the lower layer may not be clear, and thus the multilayer formulation may not be implemented. If the content of the second oil phase is more than 35 wt%, the low fluidity of the vegetable oil in the middle layer may be maximized, which may cause a problem of reduced usability.

[0038]

[0039] In an embodiment, the non-polar oil included in the first oil phase and the polar oil included in the second oil phase may be included in a weight ratio of 1:0.2 to 1.25, specifically, a weight ratio of 1:0.75 to 1.25, and more specifically, a weight ratio of 1:0.9 to 1.1. When the non-polar oil and the polar oil are included in similar weight ratios as described above, the formulation stability may be further improved. In addition, when the weight ratio of the non-polar oil and the polar oil is less than 1:0.2 and the content of the non-polar oil is excessively increased, the formulation stability may be significantly reduced.

[0040]

[0041] The aqueous phase included in the multilayer cosmetic composition of the present invention may correspond to a lower layer structure among the multilayer structures. The aqueous phase may have a higher specific gravity than the components included in the first oil phase and the second oil phase, and thus may be located in the lower layer of the multilayer cosmetic composition.

[0042] In an embodiment, the composition may include at least one selected from the group consisting of a thickener including gums, carbomers, acrylates, hyaluronic acid, and starches; a preservative including 1,2-hexanediol and 1,2-pentanediol; a polyol including glycerin, butylene glycol, propylene glycol, dipropylene glycol, methylpropanediol, pentylene glycol, glycereth-26, propanediol, sorbitol, and diglycerin; an ion sequestering agent including EDTA and disodium EDTA; and a pH adjuster including sodium chloride and sodium citrate.

[0043] In addition, the cosmetic composition of the present invention may further include ingredients included in general cosmetic compositions, and may include, for example, a skin conditioning agent; an antioxidant including tocopherol, ascorbic acid, erythorbic acid, etc.; alcohol; a fragrance; a functional ingredient including a wrinkle improvement agent, a whitening functional ingredient, a pigmentation functional ingredient, a skin soothing functional ingredient, and a sebum or pore management functional ingredient; and the like.

[0044] In addition, according to an embodiment of the present invention, a multilayered cosmetic composition comprising the multilayered cosmetic composition according to the present invention is provided. According to an embodiment, the cosmetic composition of the present invention can be manufactured into a product having various effects, such as antioxidant, skin whitening, and / or skin barrier improvement effects, depending on the type of active ingredient added to the cosmetic composition. For example, it can be manufactured into functional cosmetics such as serums, creams, nourishing creams, essences, and ampoules, or basic cosmetics such as toners and lotions.

[0045] The mixing amount of the above-described components is 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 effect of the present invention.

[0046]

[0047] Hereinafter, examples and experimental examples are presented to explain the present invention more specifically, but the present invention is not limited thereto.

[0048]

[0049] Manufacturing example. Manufacturing of Example 1

[0050]

[0051] (1) Ingredients and manufacturing method of Example 1

[0052] Example 1 of a three-layer formulation was prepared with the composition and ingredients described in Table 1 below. Specifically, the nonpolar oil of the first oil phase was C15-19 alkane, and the polar oil of the second oil phase was castor oil, a type of vegetable oil. The aqueous phase contained purified water, sodium hyaluronate as a thickener, propanediol as a moisturizer, disodium EDTA as an ion sequestering agent, sodium chloride as an acidity regulator, and 1,2-hexanediol as a preservative. The unit in Table 1 is weight %.

[0053]

[0054]

[0055] The specific manufacturing method of Example 1 is as follows.

[0056] Components of the first oil phase, the second oil phase, and the water phase were prepared separately. The second oil phase was added to the water phase to prepare a two-phase mixture, and then the first oil phase was added to the mixture and mixed to complete Example 1 of the three-layered phase.

[0057]

[0058] (2) Evaluation of formulation formation and formulation stability of Example 1

[0059] For Example 1 manufactured with the composition shown in Table 1 above, evaluation of formulation formation and formulation stability was conducted.

[0060] Specifically, the formation of a formulation was visually observed after manufacturing was completed to determine whether a three-layer formulation was formed, and the stability of the formulation was comprehensively evaluated to determine whether separation into a multilayer formulation occurred within 1 hour after shaking the formulation and whether separation was completely and well maintained in the form of the initial multilayer formulation within 24 hours. The evaluation results were recorded based on the criteria in Table 2 below.

[0061]

[0062]

[0063] The results of evaluating Example 1 according to the above evaluation method and the evaluation criteria of Table 2 are shown in Table 3 below, and FIG. 1 shows a photograph taken immediately after preparing Example 1, and FIG. 2 shows photographs of the formulation taken immediately after shaking Example 1, 30 seconds later, 60 seconds later, and 1 hour later.

[0064]

[0065]

[0066] As shown in Table 3 above, Example 1 formed a multilayered formulation with a clearly distinguishable layered structure, and it was observed that the multilayered formulation was separated after 60 seconds of shaking, and it was confirmed that the multilayered formulation was well separated after 1 hour as it was immediately after manufacturing.

[0067]

[0068] Experimental Example 1. Comparative experiment according to the type of oil in the first oil compartment.

[0069] (1) Manufacturing of examples and comparative examples

[0070] In order to confirm the influence of the type of oil in the first oil phase on the formation and stability of the multilayer formulation, examples and comparative examples were prepared by varying the type of oil in the first oil phase in Example 1 and keeping the contents of the remaining components the same. Specifically, the oil in the examples was hydrogenated poly(C6-14 olefin) used alone or mixed with the C15-19 alkane of Example 1, and the oil in the comparative examples was caprylic / capric triglyceride, which is a polar oil, or dimethicone, which is a silicone oil. The manufacturing method is the same as that in Example 1. The types and contents of the oils in the first oil phase are shown in Table 4 below. The unit in Table 4 is weight%.

[0071]

[0072]

[0073] (2) Evaluation of formulation formation and formulation stability

[0074] For the above Examples 2 to 4 and Comparative Examples 1 to 2, the formation of formulations and formulation stability were evaluated using the same method as in the above Manufacturing Example. The evaluation results for the Examples and Comparative Examples are shown in Table 5 below.

[0075]

[0076]

[0077] As described in Table 5 above, in Examples 2 to 4, which used hydrocarbon oils corresponding to nonpolar oils as the oil in the first oil phase, a multilayer formulation was formed, and it was confirmed that the formulation was smoothly separated immediately after production with excellent separation ability after shaking. On the other hand, in Comparative Example 1, which used polar oils as the oil in the first oil phase, and Comparative Example 2, which used silicone oil, a multilayer formulation was formed with an uneven and unstable interface, and the multilayer formulation was not separated after shaking.

[0078] Therefore, it was confirmed that using a non-polar oil as the oil of the first oil phase is an important factor in achieving the formation and stability of the multilayer formulation aimed at by the present invention.

[0079]

[0080] Experimental Example 2. Comparative experiment according to the type of oil and monounsaturated fatty acid content of the second oil phase.

[0081] (1) Manufacturing of examples and comparative examples

[0082] In order to confirm the influence of the type of oil in the second oil phase and the monounsaturated fatty acid content of the oil in the second oil phase on the formation and stability of the multilayer formulation, a comparative example was prepared by changing the type of oil in the second oil phase and keeping the contents of the remaining ingredients the same in Example 1, and comparing it with Example 1 for comparison with the comparative example. Specifically, as the oil in the second oil phase, vegetable oils such as olive oil, almond oil, safflower seed oil, argan oil, meadowfoam seed oil, and jojoba oil were each used singly, or at least one of the six types of oils and castor oil were used together. The manufacturing method is the same as that of Example 1. Table 6 below shows the monounsaturated fatty acid content of the oil in the second oil phase used in the manufacturing of the examples and comparative examples. Table 7 below also shows the type and content of the oil in the second oil phase. The unit in Tables 6 and 7 is weight%.

[0083]

[0084]

[0085]

[0086] (2) Evaluation of formulation formation and formulation stability

[0087] For the above Comparative Examples 3 to 12, the formation of a formulation and the stability of the formulation were evaluated using the same method as in the above Manufacturing Example. The evaluation results of Example 1 and the Comparative Example are shown in Table 8 below.

[0088]

[0089]

[0090] As described in Table 8 above, only Example 1, which used castor oil having a monounsaturated fatty acid content of 87 wt% or more as the second oil phase, was confirmed to form a multilayered formulation and have excellent formulation stability. On the other hand, Comparative Examples 3 to 12, which used oil having a monounsaturated fatty acid content of less than 87 wt%, were confirmed to not form a multilayered formulation itself or to have an uneven interface after shaking, so that a multilayered structure was not formed.

[0091] Therefore, it was confirmed that using an oil having a monounsaturated fatty acid content of 87 wt% as the polar oil of the second oil phase is an important factor in achieving the formation and stability of the multilayer formulation aimed at by the present invention.

[0092]

[0093] While specific aspects of the present invention have been described in detail above, it will be apparent to those skilled in the art that these specific descriptions merely represent preferred embodiments and are not intended to limit the scope of the present invention. Therefore, the substantial scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. In a multilayer cosmetic composition, Includes the first oily part; the second oily part; and the watery part; The above first oil phase comprises a non-polar oil, The above second oil phase contains polar oil, A multilayer cosmetic composition, characterized in that the first oil phase, the second oil phase, and the water phase are separated into three layers.

2. In paragraph 1, A multilayer cosmetic composition, characterized in that the nonpolar oil of the first oil phase comprises a hydrocarbon-based oil.

3. In paragraph 1, A multilayer cosmetic composition, characterized in that the nonpolar oil of the first oil phase comprises at least one of a C15-19 alkane and a hydrogenated poly(C6-14 olefin).

4. In paragraph 1, A multilayer cosmetic composition, characterized in that the first oil phase is included in an amount of 1 to 35 wt% based on the total weight of the multilayer cosmetic composition.

5. In paragraph 1, A multilayer cosmetic composition, characterized in that the polar oil of the second oil phase comprises a vegetable oil.

6. In paragraph 5, A multilayer cosmetic composition, characterized in that the vegetable oil has a monounsaturated fatty acid content of 87 wt% or more based on the total weight of the second oil phase.

7. In paragraph 5, A multilayer cosmetic composition characterized in that the vegetable oil comprises castor oil.

8. In paragraph 1, A multilayer cosmetic composition, characterized in that the second oil phase is included in an amount of 1 to 35 wt% based on the total weight of the multilayer cosmetic composition.

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