Multi-layer emulsion cosmetic composition

Abstract

The present invention relates to a multi-layer emulsion cosmetic composition that does not contain a surfactant and exhibits excellent stability.

Description

[Technical field]

[0001] The present invention relates to a cosmetic composition, specifically to a multi-layer emulsion cosmetic composition comprising an internal phase of a hydrogel layer, an intermediate phase of an organogel layer, and an external phase of a water layer. [Background technology]

[0002] Various types of emulsion-type cosmetics are used to provide various effective ingredients to the skin, and emulsion-type cosmetics are generally classified into oil-in-water (O / W) and water-in-oil (W / O) formulations. Both of these contain an oil phase and an aqueous phase, and can provide softening and moisturizing effects. However, since the external phase of the oil-in-water formulation is water, it feels cool when applied and has excellent spreadability, but has the disadvantage of poor makeup durability and water resistance. On the other hand, water-in-oil formulations have excellent makeup durability and water resistance, but have the disadvantage of not providing a refreshing feeling due to stickiness and oiliness, and poor usability such as spreadability and spreadability. In addition, in the case of unstable ingredients among various effective ingredients, it is difficult to stably support them in conventional emulsion-type cosmetics, and there are problems such as the effective ingredients precipitating or separating out in the formulation.

[0003] As an alternative to such conventional emulsion-type cosmetics, research is being conducted on water-in-oil-in-water (W / O / W) type multi-layer emulsion cosmetics that have the advantages of both O / W type and W / O type cosmetics. However, in the W / O / W type, since an oil phase exists between the inner and outer aqueous phases, the interfacial membrane is easily destroyed or phase inversion occurs due to osmotic pressure caused by the difference in electrolyte concentration between the outer and inner aqueous phases, making it difficult to ensure stability. In order to realize excellent usability and interfacial membrane stability by appropriately adjusting the ratio of the aqueous phase and the oil phase, surfactants are usually used, but this goes against the recent consumer preference for ingredients that are safe for the skin and the environment. Therefore, there is a demand for the development of a multi-layer emulsion cosmetic composition that does not contain a surfactant and has excellent interfacial membrane stability between the aqueous phase and the oil phase. Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention provides a multi-layer emulsion cosmetic composition that does not contain a surfactant and exhibits excellent stability. [Means for solving the problem]

[0005] The multi-layer emulsion cosmetic composition of the present invention comprises an internal phase of a hydrogel layer, an intermediate phase of an organogel layer, and an external phase of a water layer. Effect of the Invention

[0006] The present invention provides a multi-layer emulsion cosmetic composition that does not contain a surfactant and has a high degree of stability of the interfacial film between the aqueous phase and the oil phase, and exhibits excellent stability. Since the cosmetic composition according to the present invention does not contain a surfactant, it is less irritating to the skin and is environmentally friendly, and has excellent spreadability, spreadability, and usability in a multi-layer emulsion formulation, as well as excellent cosmetic durability and water resistance. Furthermore, due to the structural characteristics of the multi-layer emulsion, the intermediate phase and the internal phase do not come into contact with air, so the cosmetic composition of the present invention is suitable for simultaneously stabilizing oil-soluble and water-soluble active ingredients in one formulation. [Brief description of the drawings]

[0007] [Figure 1] 1 is a micrograph of the mesophase of Example 1. [Diagram 2] 1 is a micrograph of the mesophase of Comparative Example 1. [Diagram 3] 1 is a micrograph of the mesophase of Comparative Example 3. [Figure 4] 1 is a micrograph of the W / O dosage form of Example 4. [Diagram 5] 1 is a micrograph of the W / O dosage form of Example 5. [Figure 6] 1 is a micrograph of the W / O dosage form of Example 6. [Figure 7]1 is a micrograph of the W / O / W dosage form of Example 7. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] The present invention will be described below. However, the present invention is not limited to the following content, and each component may be modified or mixed in various ways as necessary. Therefore, it should be understood that the present invention includes all modifications, equivalents, and alternatives within the spirit and technical scope of the present invention.

[0009] The present invention relates to a multi-layer emulsion cosmetic composition, which comprises an internal phase of a hydrogel layer, an intermediate phase of an organogel layer, and an external phase of a water layer.

[0010] Interior Minister The internal phase of the multi-layer emulsion cosmetic composition according to the present invention is a hydrogel layer, which comprises purified water, a hydrogel-forming substance and a salt.

[0011] The hydrogel-forming material may be any material known in the art to form a hydrogel structure, such as gellan gum, agar, carrageenan, alginate, pectin, gelatin, xanthan gum, locust bean gum (LBG), guar gum, starch, chitosan, cellulose, collagen, etc., which may be used alone or in combination of two or more.

[0012] The hydrogel forming material may be contained in an amount of 0.05 to 10% by weight, for example, 0.1 to 5% by weight, based on the total weight of the internal phase. If the content of the hydrogel forming material is less than the above range, the hydrogel may not be formed, and if it exceeds the above range, the hydrogel may not break on the skin due to an increase in hardness.

[0013] The salt includes at least one salt selected from the group consisting of an alkali metal salt and an alkaline earth metal salt, and a phosphate salt. The alkali metal salt and the alkaline earth metal salt serve to harden the hydrogel, while the phosphate salt serves to retard the hardening rate. Therefore, by using the two salts in combination, the hydrogel phase of the multi-layer emulsion can be stably formed.

[0014] The alkali metal salts and alkaline earth metal salts may include calcium salts, beryllium salts, magnesium salts, strontium salts, barium salts, radium salts, potassium salts, sodium salts, lithium salts, etc. Examples include calcium chloride, calcium sulfate, calcium carbonate, potassium chloride, potassium bicarbonate, potassium hydroxide, sodium hydroxide, lithium hydroxide, etc., which may be used alone or in combination of two or more.

[0015] The content of one or more of the alkali metal salts and alkaline earth metal salts may be 0.005 to 0.5 wt %, for example, 0.01 to 0.25 wt %, based on the total weight of the internal phase. If the content of one or more of the alkali metal salts and alkaline earth metal salts is less than the above range, the degree of hardening of the hydrogel is insufficient, and if it exceeds the above range, the reactivity becomes very high, making it difficult to harden the hydrogel uniformly.

[0016] The phosphate salt may be, for example, tetrasodium pyrophosphate, trisodium phosphate, sodium tetraphosphate, sodium tripolyphosphate, sodium phosphate, disodium pyrophosphate, or the like, and these may be used alone or in combination of two or more.

[0017] The phosphate salt may be included in an amount of 0.0025 to 0.25 wt %, for example, 0.005 to 0.125 wt %, based on the total weight of the internal phase. If the content of the phosphate salt is less than the above range, the effect of retarding the hardening speed is insufficient, and the hardening speed is too fast, which may affect the uniformity of the particle size, and if the content of the phosphate salt is more than the above range, the effect of retarding the hardening speed is excessive, and the hardening speed is too slow, which may hinder the gel formation and make it difficult to form spherical particles.

[0018] The internal phase may include active ingredients such as niacinamide, adenosine, hyaluronic acid, azelaic acid, ascorbic acid, kojic acid, glycolic acid, arbutin, peptides, etc.

[0019] Purified water may be included in an amount to fill the total weight of the internal phase (100% by weight).

[0020] Mesophase The intermediate phase of the multi-layer emulsion cosmetic composition according to the present invention is an organogel layer, which contains oil and an organogel-forming substance.

[0021] The organogel-forming substance plays a role in forming an organogel structure, which is a three-dimensional network structure made of a lipophilic solvent. When an organogel is formed in the mesophase, the network structure is maintained together with the oil and the thickener, and as a result, a stable multilayer emulsion without destruction of the interfacial membrane or phase inversion can be formed without using an emulsifier (surfactant).

[0022] Examples of the organogel-forming substance include amino acid derivatives such as N-lauroyl-L-glutamic acid and α,γ-di-n-butylamine, dextrin fatty acid esters such as dextrin palmitate, dextrin stearate, dextrin palmitate / ethylhexanoate, dextrin myristate, sucrose fatty acid esters such as sucrose palmitate and sucrose stearate, fructooligosaccharide fatty acid esters such as inulin stearate and fructooligosaccharide 2-ethylhexanoate, sorbitol benzylidene derivatives such as monobenzylidene sorbitol and dibenzylidene sorbitol, polyurethane-79, polyethylene, glyceryl behenate, glyceryl behenate / eicosadioate, stearoyl inulin, and the like. Inulin, trihydroxystearin, polybutene, polyamide-2, polyamide-3, polyamide-5, polyamide-8, hydrogenated vegetable oil, isophorone diisocyanate copolymer (IPDI Copolymer), etc. can be used, and these can be used alone or in combination of two or more.

[0023] The organogel former may be included in an amount of 5 to 40% by weight, for example 10 to 20% by weight, based on the total weight of the mesophase. If the content of the organogel former is less than the above range, the organogel may not be formed, or may be formed weakly, resulting in reduced particle retention and stability. If the content of the organogel former is more than the above range, the viscosity and hardness may increase, impairing the feel when used and making it difficult to prepare a multilayer emulsion.

[0024] The intermediate phase may contain a stabilizing agent, which enhances the stabilization of the organogel by exerting a thickening effect and an effect of preventing oil-wetting, thereby maintaining a stable multiple emulsion.

[0025] Examples of the stabilizer include disteardimonium hectorite, stearalkonium hectorite, quaternium-18 hectorite, dihydrogenated tallow benzylmonium hectorite, montmorillonite, bentonite, attapulgite, sepiolite, calcium silicate, silica, silica silylate, silica dimethyl silylate, polymethylsilsesquioxane / silica crosspolymer, mica, polymethyl methacrylate ... Methacrylate, Nylon-6, Iron Oxides, Tin Oxide, Methyl Methacrylate Crosspolymer, Titanium Dioxide, Synthetic Fluorphlogopite, Polymethylsilsesquioxane, etc. can be used, and these can be used alone or in combination of two or more.

[0026] The stabilizer may be included in an amount of 5 to 40% by weight, for example, 10 to 20% by weight, based on the total weight of the mesophase. If the content of the stabilizer is less than the above range, the effect of enhancing the high temperature and long-term stability of the formed organogel is insufficient, and if it exceeds the above range, the viscosity and hardness are increased, which not only impairs the feeling of use but also makes it difficult to prepare a multilayer emulsion.

[0027] The oil can be any oil used in the art, without any particular limitation.For example, the oil can be mineral oil, isohexadecane, isostearyl isostearate, isopropyl myristate, caprylic / capric triglyceride, diisopropyl adipate, isononyl isononanoate, isodecyl neopentanoate, cetyl ethylhexanoate, octyldodecyl myristate, di-C12-13 alkyl maleate, pentaerythrityl tetraisostearate, pentaerythrityl tetraethylhexanoate, diisostearyl maleate, isopropyl palmitate, C12-15 alkyl benzoate, dicaprylic carbonate, dicaprylic ether, 2-octyldodecanol, dimethicone, lauryl Dimethicone, cyclopentasiloxane, cyclohexasiloxane, trisiloxane, methyltrimethicone, amodimethicone, phenyltrimethicone, phenylmethicone, dimethicone copolyol, dimethicone copolyol acetate, silicone glycol copolyol, dimethiconol, methylpolysiloxane, methylphenylpolysiloxane, dimethicone copolyol methyl ether, methylcyclopolysiloxane, dimethylpolysiloxane, hexamethyldisiloxane, aminopropyl dimethicone, caprylyl methylpolysiloxane, simethicone, and the like can be used, and these can be used alone or in combination of two or more.

[0028] The intermediate phase may contain an active ingredient, such as, for example, Retinyl Palmitate, Retinol, Retinal, Tretinoin, Retinoic Acid, Adapalene, Tazarotene, Isotretinoin, Calciferol, Tocopherol, Phytonadione, etc.

[0029] The oil may be present in an amount sufficient to satisfy the total weight of the mesophase (100% by weight).

[0030] The mesophase organogel has a hardness of 5 to 60 Dyne / cm 2 For example, 10 to 30 Dyne / cm 2 If the organogel has a hardness below the above range, gelling does not proceed, making it difficult to maintain the particle shape, and as a result, the multi-layer emulsion structure is not maintained. On the other hand, if the organogel has a hardness above the above range, it hardens too quickly to form a multi-layer emulsion, and the spreadability on the skin is poor.

[0031] Foreign Minister The outer phase of the multi-layer emulsion cosmetic composition according to the present invention is a water phase, which contains purified water.

[0032] The external phase may include a water-soluble thickener. The water-soluble thickener present in the external phase serves to maintain particle stability (sinking / floating) within the intermediate phase and the internal phase.

[0033] Examples of the water-soluble thickener include Carbomer, Sodium Polyacryloyldimethyl Taurate, Polyacrylate Crosspolymer-11, Acrylates Copolymer, Acrylates / C10-30 Alkyl Acrylate Crosspolymer, Carbomer Ammonium Acryloyldimethyltaurate / VP Copolymer, Sodium Polyacrylate, Cellulose Gum, Hydroxyethylcellulose, Ethylcellulose, Carboxymethyl Hydroxypropyl Guar, Xanthan Gum, Gum Arabic, Guar Gum, etc. Gum), etc., can be used, and these can be used alone or in combination of two or more.

[0034] The water-soluble thickener may be contained in an amount of 0.05 to 10% by weight, for example, 0.1 to 5% by weight, based on the total weight of the external phase. If the content of the water-soluble thickener is less than the above-mentioned range, the viscosity is low, resulting in poor particle stability, whereas if the content exceeds the above-mentioned range, the viscosity is high, resulting in poor feel in use, such as poor spreadability and stickiness, making it difficult to produce a multilayer emulsion.

[0035] The external phase may include a polyol, such as glycerin, 1,3-butylene glycol, propylene glycol, polyethylene glycol, sorbitol, pentylene glycol, methylpropanediol, etc., which may be used alone or in combination of two or more.

[0036] The polyol may be contained in an amount of 0.5 to 40% by weight, for example 1 to 20% by weight, based on the total weight of the external phase.

[0037] The external phase may include a chelating agent, a pH regulator, a solvent, a film former, a moisturizing agent, a preservative stabilizer, a skin conditioning agent, and a functional cosmetic main ingredient. As the preservative, 1,2-hexanediol, ethylhexylglycerin, hydroxyacetophenone, glyceryl caprylate, caprylyl glycol, phenoxyethanol, etc. can be used. As the chelating agent, disodium EDTA, trisodium EDTA, tetrasodium EDTA, etc. can be used. As the pH regulator, tromethamine, triethanolamine, imidazolidinyl urea, etc. can be used.

[0038] The multi-layer emulsion cosmetic composition of the present invention may be in any one of the following dosage forms: lotion, essence, cream, serum, mask liquid, ampoule, or pack form, but is not limited thereto.

[0039] The multi-layer emulsion cosmetic composition of the present invention can be produced by various methods generally known in the art. As an example, it can be produced by the following method.

[0040] A hydrogel phase containing purified water, a hydrogel-forming material, and a salt, and an organogel phase containing oil, an organogel-forming material, and optionally a stabilizer are prepared. The prepared hydrogel phase is added to the organogel phase and stirred to prepare a W(hydrogel) / O(organogel) emulsion. The prepared W / O emulsion is added to the outer phase and stirred to prepare a W / O / W multiple emulsion. EXAMPLES

[0041] The present invention will be described in more detail below with reference to examples. However, the following examples are provided to aid in understanding the present invention, and are not intended to limit the scope of the present invention in any way.

[0042] [Examples 1 to 3: Preparation of mesophase] The mesophases of the respective examples were prepared according to the compositions shown in Table 1 below, and the physical properties were measured by the following methods.

[0043] [Comparative Examples 1 to 3: Production of mesophase] A mesophase was prepared in the same manner as in Examples 1 to 3, except for the composition shown in Table 1 below, and the physical properties were measured.

[0044] Manufacturing of O / W dosage forms An outer phase was prepared consisting of 0.2% by weight of carbomer, 0.2% by weight of tromethamine, 10% by weight of polyol, 1.5% by weight of 1,2-hexanediol, 0.05% by weight of ethylhexylglycerin, and the remaining amount of water (to 100), and the intermediate phase of each Example and Comparative Example was added to the outer phase to prepare an O / W dosage form. In order to exclude the involvement of the internal phase and to confirm the stability of the intermediate phase in the presence of the external phase, the physical properties of the intermediate phase in the O / W dosage form were evaluated.

[0045] Presence or absence of organogel formation In each of the Examples and Comparative Examples, it was observed visually or by a microscope whether or not an organogel was formed in the intermediate phase within the O / W formulation.

[0046] Organogel particle morphology The particle morphology of the organogel in the O / W formulation of each of the Examples and Comparative Examples was observed under a microscope. [Evaluation Criteria] ○: Particle interface is stable and round shape X: Particle interface is unstable and distorted

[0047] hardness The hardness of the intermediate phase in each of the Examples and Comparative Examples was measured using a FUDOH rheometer (conditions: 1 mmΦ, 30 cm / min, 10 mm Depth).

[0048] High temperature stability The O / W formulations prepared in the above examples and comparative examples were left at a temperature of 40 to 60° C. for one month, and then the oil was examined under a microscope to see if it exuded any oil, thereby evaluating the high temperature stability. [Evaluation Criteria] ●: No oil seeps out at all temperatures ○: Fine oil seeps out at 60℃ X: Oil seeps out at temperatures below 60℃

[0049] [Table 1]

[0050] As shown in Table 1, the mesophases of Examples 1 to 3 according to the present invention formed organogel having a stable, rounded morphology at the particle interface, and exhibited excellent hardness and high-temperature stability. In particular, the mesophase of Example 1, which further contained a stabilizer, formed an organogel having a stable, rounded morphology at the particle interface (FIG. 1), and exhibited excellent high-temperature stability.

[0051] On the other hand, in the case of Comparative Example 1, in which the organogel former was contained in an amount less than the range of the present invention, the hardness of the mesophase was very low, and as a result, the particles were not maintained at high temperatures and were distorted, and eventually the particles burst, i.e., the emulsion was broken (FIG. 2). The mesophase of Comparative Example 2, in which the organogel former was contained in an amount exceeding the range of the present invention, formed an organogel, but the particle interface was unstable and formed in a distorted form. If the hardness is too high as in Comparative Example 2, it is sensitive to temperature and hardens quickly, so the particles are not easily hardened and formed in a round form during the process of forming a multi-layer emulsion, and it is difficult to apply because it is hard and does not break on the skin, and the phenomenon of oil seeping out at high temperatures increases. In addition, the mesophase of Comparative Example 3, which does not contain an organogel former and contains only a stabilizer, did not form an organogel (FIG. 3).

[0052] [Examples 4 to 6: Production of W / O dosage forms] After preparing the internal phase of each Example according to the composition shown in Table 2 below, the internal phase (hydrogel) of Examples 4 to 6 was added to the intermediate phase (organogel) prepared in Example 1 and stirred with a homomixer to prepare a W(hydrogel) / O(organogel) emulsion formulation. The physical properties of the prepared W / O formulation of each Example were measured by the following methods.

[0053] [Comparative Examples 4-5: Production of W / O Formulations] W / O formulations were prepared in the same manner as in Examples 4 to 6, except for the compositions shown in Table 2 below, and the physical properties were measured.

[0054] Presence or absence of hydrogel formation Whether or not a hydrogel was formed in the internal phase of the W / O dosage form of each Example and Comparative Example was observed visually or by a microscope.

[0055] Hydrogel particle morphology / uniformity The particle morphology of the hydrogels of each Example and Comparative Example and whether the particles of the inner phase were uniformly distributed in the intermediate phase were observed under an optical microscope.

[0056] [Table 2]

[0057] As shown in Table 2, the internal phases of the W / O formulations of Examples 4 to 6 according to the present invention formed hydrogels (FIGS. 4 to 6). In particular, the internal phase of the W / O formulation of Example 4 containing 0.1 wt % of a phosphate salt formed a spherical hydrogel with a uniform particle size (FIG. 4).

[0058] On the other hand, the internal phase of the W / O formulation of Comparative Example 4, which contains only the calcium salt among the two salts according to the present invention, formed a hydrogel, but gelled immediately and particles were not uniformly formed. In addition, the internal phase of the W / O formulation of Comparative Example 5, which contains only the phosphate salt among the two salts according to the present invention, did not form a hydrogel. Therefore, the W / O formulations of Comparative Examples 4 and 5 were not used to prepare a multilayer emulsion.

[0059] [Examples 7 to 9: Preparation of multi-layer emulsion (W / O / W)] An outer phase was prepared consisting of 0.2% by weight of carbomer, 0.2% by weight of tromethamine, 10% by weight of polyol, 1.5% by weight of 1,2-hexanediol, 0.05% by weight of ethylhexylglycerin, and the remaining amount of water (to 100). The W / O emulsifier of Examples 4-6 was added to the outer phase prepared and stirred with an agitator to prepare the W / O / W multilayer emulsions of Examples 7-9.

[0060] Observation of the W / O / W multilayer emulsions of each Example using an optical microscope revealed that in all of the emulsions of Examples 7 to 9, the particles of the intermediate phase were uniformly distributed in the outer phase while still containing the inner phase (Figure 7), confirming that a stable multilayer emulsion had been formed. [Industrial Applicability]

[0061] The present invention provides a multi-layer emulsion cosmetic composition that does not contain a surfactant and exhibits excellent stability due to the high stability of the interfacial film between the aqueous phase and the oil phase. Since the cosmetic composition according to the present invention does not contain a surfactant, it is less irritating to the skin and is environmentally friendly, and has excellent spreadability, spreading ability, and usability in a multi-layer emulsion formulation, as well as excellent cosmetic durability and water resistance. Furthermore, due to the structural characteristics of the multi-layer emulsion, the intermediate phase and the internal phase do not come into contact with air, making the cosmetic composition of the present invention suitable for simultaneously stabilizing oil-soluble and water-soluble active ingredients in one formulation.

Claims

1. A multi-layer emulsion cosmetic composition comprising an internal phase of a hydrogel layer, an intermediate phase of an organogel layer, and an external phase of a water layer, the internal phase comprises purified water, a hydrogel-forming material and a salt; the salts include one or more of alkali metal salts and alkaline earth metal salts and phosphate salts; 0.0025 to 0.25% by weight of said phosphate salt, based on the total weight of said internal phase; the intermediate phase comprises an oil and an organogel-forming material; the organogel-forming substance is at least one selected from the group consisting of polyamide-2, polyamide-3, polyamide-5, and polyamide-8; A multi-layer emulsion cosmetic composition comprising 5 to 40% by weight of said organogel-forming material based on the total weight of said intermediate phase.

2. 2. The multi-layer emulsion cosmetic composition according to claim 1, wherein the hydrogel-forming material is at least one selected from the group consisting of gellan gum, agar, carrageenan, alginate, pectin, gelatin, xanthan gum, locust bean gum (LBG), guar gum, starch, chitosan, cellulose, and collagen.

3. 2. The multi-layer emulsion cosmetic composition according to claim 1, wherein the alkali metal salt and alkaline earth metal salt are at least one selected from the group consisting of calcium salts, beryllium salts, magnesium salts, strontium salts, barium salts, radium salts, potassium salts, sodium salts and lithium salts.

4. 2. The multi-layer emulsion cosmetic composition according to claim 1, comprising, based on the total weight of the internal phase, 0.05 to 10% by weight of the hydrogel-forming material, and 0.005 to 0.5% by weight of one or more of the alkali metal salts and alkaline earth metal salts.

5. 2. The multi-layer emulsion cosmetic composition according to claim 1, further comprising 5 to 40% by weight of a stabilizer, based on the total weight of the intermediate phase.

6. 2. The multi-layer emulsion cosmetic composition according to claim 1, further comprising 0.05 to 10% by weight of a water-soluble thickener, based on the total weight of the external phase.

7. The hardness of the mesophase organogel is 5 to 60 Dyne / cm ２ 2. The multi-layer emulsion cosmetic composition according to claim 1, wherein

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