A water-in-oil type cosmetic composition comprising an oil-absorbing polymer in the inner water phase and manufacturing method thereof

Abstract

This disclosure relates to a water-in-oil cosmetic composition comprising an oil-absorbing polymer in an aqueous inner phase, specifically a color cosmetic composition. The water-in-oil cosmetic composition of this disclosure exhibits significantly superior adhesion and persistence without increasing the viscosity of the formulation by emulsifying the water-dispersible oil-absorbing polymer dispersed in the aqueous inner phase.

Description

Technical Field

[0001] This application claims priority based on Korean Patent Application No. 10-2021-0140591, filed on October 20, 2021, and Korean Patent Application No. 10-2022-0026895, filed on March 2, 2022, the contents of which are disclosed in the specification and drawings of which are incorporated herein by reference.

[0002] This invention relates to a water-in-oil cosmetic composition containing an oil-absorbing polymer in the aqueous phase, specifically a makeup cosmetic composition. Prior Technology

[0003] For makeup products, visual effects such as coverage, adhesion, and staying power, as well as tactile sensations such as hydration, softness, and coolness, are all important factors. However, these are often trade-offs that are difficult to achieve simultaneously, so in many cases, it is necessary to sacrifice some attributes.

[0004] Existing water-in-oil emulsion makeup formulations are prepared by combining a large amount of volatile oil with lipophilic polymers such as acrylate polymers and silicone resins to enhance adhesion and staying power. Polymers are used in combination with volatile oils because they increase the viscosity of the formulation and result in a heavy, sticky feel. As mentioned above, when lipophilic polymers and volatile oils are combined, the concentration of polymers increases as the volatile oils evaporate, thereby enhancing skin adhesion and staying power, and preventing makeup removal due to external factors.

[0005] However, the higher the content of volatile oils in a formulation, the more limitations there are in manufacturing technology. Furthermore, over time, changes in physical properties can lead to decreased usability and formulation stability, potentially causing dryness of the skin. Reducing the amount of volatile oils requires adding a larger amount of polymer to achieve the same effect, but this results in poorer fluidity and a heavier feel. Therefore, there is a real need to develop a makeup composition that eliminates the aforementioned drawbacks caused by the combination of existing polymers and volatile oils, while also offering excellent makeup longevity and a refreshing, lightweight feel.

[0006] On the other hand, traditional makeup cosmetic compositions want to include a water-dispersible oil-absorbing polymer or powder in the outer aqueous phase of the oil-in-water type to prevent the phenomenon of makeup film falling off after skin application. Specifically, when the outer aqueous phase of the oil-in-water type contains a large amount of water-dispersible oil-absorbing polymers, sebum can be absorbed through the residual oil-absorbing ability after absorbing the oil components of the inner oil phase after skin application, thereby preventing the makeup film from falling off. However, there are no instances of the use of water-dispersible oil-absorbing polymers in water-in-oil dosage forms containing large amounts of oil to improve applicability, adhesion, persistence as in the present disclosure. Contents of the invention

[0007] Problems to be solved

[0008] The topic to be addressed in this disclosure is to provide a cosmetic composition that provides a refreshing and light sense of use while having excellent makeup persistence, specifically cosmetic cosmetic compositions.

[0009] The solution to the problem

[0010] As a result of an in-depth study by the inventors of the present disclosure to address the decrease in usability and dosage form stability of existing cosmetic compositions containing polymer polymers and volatile oils, they found that by dispersing water-dispersed oil-absorbing polymers in the internal aqueous phase of the water-in-oil type for emulsification, the adhesion and persistence of cosmetic compositions can be improved without increasing the viscosity of the dosage form.

[0011] The present disclosure provides an oil-in-water-based cosmetic composition comprising a water-dispersible oil-absorbing polymer in an intrinsic aqueous phase. The cosmetic compositions of the present disclosure may in turn improve the applicability while keeping the viscosity of the dosage form low by including a water-dispersible oil-absorbing polymer in the inner aqueous phase. If an oil-dispersible oil-absorbing polymer or powder is used, the oil-dispersible oil-absorbing polymer or powder interacts with the oil, resulting in increased viscosity and worse applicability of the cosmetic composition. In contrast, the cosmetic compositions of the present disclosure, by including surface water-dispersible oil-absorbing polymers in the inner aqueous phase, can in turn solve the problem of increased viscosity due to the above-mentioned oil-dispersible oil-absorbing polymers or interactions between powder and oil and improve the applicability.

[0012] Furthermore, the water-dispersible oil-absorbing polymer contained in the aforementioned inner aqueous phase can encounter and absorb the oil phase components of the outer phase when the cosmetic composition is applied to the skin and deemulsified. This minimizes residual oil on the skin, thereby maximizing the adhesion and durability of the makeup film. The aforementioned water-dispersible oil-absorbing polymer is surface-treated with a hydrophilic modifier or coating ingredient, or its constituent components are inherently hydrophilic, thus allowing for water dispersion. Furthermore, its porous or hollow structure effectively absorbs oil phase components. Additionally, since the water-dispersible oil-absorbing polymer in the aforementioned inner aqueous phase is dispersed in the aqueous phase and contains water, the evaporation of water after application prolongs the duration of the cooling effect.

[0013] In one aspect of this disclosure, the aforementioned water-dispersible oil-absorbing polymers can be those whose surfaces have been modified to be hydrophilic using a hydrophilic modifier. For example, the hydrophilic modification of the surface of the aforementioned water-dispersible oil-absorbing polymer can be achieved through wet and / or dry techniques. The hydrophilic modification can be performed by modifying the polymer with a hydrophilic modifier containing hydrophilic functional groups (e.g., amino, carboxyl, hydroxyl, or thiol groups), but is not limited thereto. Alternatively, the aforementioned water-dispersible oil-absorbing polymers can also be oil-absorbing polymers that are not treated with a hydrophilic modifier and whose constituent components are inherently hydrophilic and therefore naturally hydrophilic. For example, hydrophilic oil-absorbing polymers prepared by co-polymerizing monomers having hydrophilic groups during polymer synthesis can also be used.

[0014] In one aspect of this disclosure, the aforementioned water-dispersible oil-absorbing polymer may be selected from polymethyl silsesquioxane, polymethyl methacrylate, methyl methacrylate crosslinked polymer, polydimethylsiloxane crosslinked polymer, polydimethylsiloxane crosslinked polymer-3, vinyl polydimethylsiloxane / polymethylsiloxane silsesquioxane crosslinked polymer, polydimethylsiloxane / vinyl polydimethylsiloxane crosslinked polymer, polydimethylsiloxane / phenylvinyl polydimethylsiloxane crosslinked polymer, diphenyl polydimethylsiloxane / vinyl The polymer comprises any one or more of the following, but is not limited to: diphenyl polydimethylsiloxane / sesquisiloxane crosslinked polymer, polydimethylsiloxane / PEG-10 / 15 crosslinked polymer, PEG-10 polydimethylsiloxane / vinyl polydimethylsiloxane crosslinked polymer, polydimethylsiloxane / polyglycerol-3 crosslinked polymer, PEG-12 polydimethylsiloxane / PPG-20 crosslinked polymer, HDI / trimethylolhexyl lactone crosslinked polymer, and polydimethylsiloxane / bis-isobutyl PPG-20 crosslinked polymer.

[0015] In one aspect of this disclosure, the content of the water-dispersible oil-absorbing polymer relative to the total weight of the composition can be 0.1 to 15% by weight, preferably 0.5 to 13% by weight, and more preferably 1 to 10% by weight. Furthermore, the content of the water-dispersible oil-absorbing polymer relative to the total weight of the composition can be 5% by weight or more. When the content of the water-dispersible oil-absorbing polymer relative to the total weight of the composition is less than 0.1% by weight, the oil-absorbing capacity after coating is insufficient, which may lead to decreased adhesion and persistence, and also a reduced water-like feel. When the content of the water-dispersible oil-absorbing polymer relative to the total weight of the composition exceeds 15% by weight, the stability of the water-in-oil formulation may decrease.

[0016] In one aspect of this disclosure, the cosmetic composition may include an emulsifier, thereby dispersing the water-dispersible oil-absorbing polymer in the inner aqueous phase, and retaining the oil without it being absorbed by the oil-absorbing polymer. In another aspect of this disclosure, the cosmetic composition is preferably not a Pickering emulsion. The emulsifier may be a conventional emulsifier used in the field of cosmetics, and may include PEG-10 polydimethylsiloxyethyl, PEG-12 polydimethylsiloxyethyl, cetyl PEG / PPG-10 / 1 polydimethylsiloxyethyl, lauryl PEG-8 polydimethylsiloxyethyl, PEG-11 methyl ether polydimethylsiloxyethyl, and PEG-9 polydimethylsiloxyethyl ethylene ... dimethicone), lauryl PEG-9 polydimethylsiloxyethyl polydimethylsiloxane, PEG-30 dihydroxystearate, sorbitan sesquiisostearate, sorbitan stearate, polydimethylsiloxane / PEG-10 / 15 crosspolymer, PEG-15 / lauryl polydimethylsiloxane crosspolymer, polyglycerol-4 isostearate, polyglycerol-4 diisostearate / polyhydroxystearate / sebate, stearic acid, polydimethylsiloxane / polyglycerol-3 crosspolymer, lauryl PEG-10 tris(trimethylsiloxy)methalkylethyl polydimethylsiloxane, polyglycerol-2 dihydroxystearate, Polyglycerol-6 polyricinoleate, PEG / PPG-19 / 19 polydimethylsiloxane, PEG / PPG-18 / 18 polydimethylsiloxane, PEG-30 glyceryl stearate, PEG-30 glyceryl isostearate, PEG-9 glyceryl laurate, polyglycerol-3 cocoate, PEG-7 glyceryl cocoate, PEG-30 glyceryl cocoate, PEG-20 methylglucose sesquistearate, PEG-20 amygdalin glyceride, PEG-60 amygdalin glyceride, PEG-40 hydrogenated castor oil, PEG-25 hydrogenated castor oil, PEG-7 olive oil ester, PEG-8 oleate, cetyl glucoside (cetyl) glucoside, polyglycerol-3-methylglucose distearate, oleyl alcohol polyether-10, oleyl alcohol polyether-20, cetyl alcohol polyether-7, cetyl alcohol polyether-12, cetyl alcohol polyether-15, cetyl alcohol polyether-17, cetyl alcohol polyether-20, cetearyl alcohol polyether-20, stearyl alcohol polyether-20, stearyl alcohol polyether-21, PEG-8 laurate, polyglycerol-10 trilaurate, sodium stearyl lactate, cetearyl glucoside, polysorbate 20, polysorbate 21, polysorbate 40, PEG-20 dehydrated sorbitan cocoate, polysorbate 60, polysorbate 65, polysorbate 80, polysorbate 85, isostearic acid PEG-20 sorbitan anhydride, or mixtures thereof.The content of the emulsifier relative to the total weight of the composition can be 0.1 to 10% by weight, preferably 1 to 9% by weight, and more preferably 2 to 8% by weight. When the content of the emulsifier is less than 0.1% by weight, it is difficult to form a water-in-oil dosage form, and when it exceeds 10% by weight, the dosage form stability may decrease or skin irritation may occur.

[0017] In one aspect of this disclosure, the aforementioned water-in-oil cosmetic composition may include an oil component commonly used in the oil phase. Specifically, the oil component may be a polar oil, a non-polar oil, or a mixture thereof. The polar oil may be an ester oil, etc., and the non-polar oil may be a silicone oil or a hydrocarbon oil, etc., but is not limited thereto. In the cosmetic composition of this disclosure, the oil component may be a silicone oil, an ester oil, or a mixture thereof.

[0018] The above-mentioned ester oils can be selected from ascorbyl palmitate, ascorbyl linoleate, ascorbyl stearate, distearate malate, etc. The following are some of the following groups of compounds: methyl benzoate, benzyl benzoate, butylene glycol dioctanoate / didecanoate, butylene glycol diisonononate, butylene glycol laurate, butylene glycol stearate, butyl isostearate, cetearyl isonononate, cetearyl nonanoate, cetearyl octanoate, cetearyl ethylhexanoate, cetearyl isonononate, ethylhexyl isonononate, ethylhexyl isonononate, ethylhexyl laurate, octyl dodecyl isostearate, isopropyl isostearate, isostearyl isonononate, isostearyl isostearate, isocetearyl ethylhexanoate, neopentyl glycol didecanoate, neopentyl glycol diethylhexanoate, neopentyl glycol diisonononate, neopentyl glycol diisostearate, pentaerythritol stearate, pentaerythritol tetraethylhexanoate, and triisooctanoic acid glyceride, but not limited thereto.

[0019] The aforementioned silicone oil can be selected from cyclomethylsiloxane, cyclotetrasiloxane, cyclohexasiloxane, cycloheptane, decamethylcyclopentasiloxane, cyclotetrasiloxane, cyclotrisiloxane, polydimethylsiloxane, capryl dimethicone, caprylyl trimethicone, and caprylyl polymethylsiloxane. The following are any one or more of the following groups: cetearyl polymethylsiloxane, hexadecyl polymethylsiloxane, hexyl polymethylsiloxane, lauryl polymethylsiloxane, myristyl polymethylsiloxane, phenyl polymethylsiloxane, stearyl polymethylsiloxane, stearyl polydimethylsiloxane, trifluoropropyl polymethylsiloxane, cetyl polydimethylsiloxane, polyphenylmethylsiloxane, dimethyl polysiloxane, methylphenyl polysiloxane, methyltrimethicone, diphenylsiloxyphenyl trimethicone, octyl polymethylsiloxane, and phenyl polytrimethicone, but not limited thereto.

[0020] The content of the oil component relative to the total weight of the composition can be 20 to 80% by weight, preferably 30 to 70% by weight. When the oil component is less than 10% by weight, it is difficult to form an oil film on the skin and it is difficult to adequately contain the internal aqueous phase, which may hinder phase stability. When the oil component exceeds 80% by weight, the viscosity of the oil phase decreases, which may hinder dosage form stability.

[0021] In one aspect of this disclosure, the content of the aqueous phase constituting the internal phase of the above-mentioned water-in-oil cosmetic composition may be 20 to 80% by weight, more preferably 30 to 70% by weight, relative to the total weight of the composition. When the aqueous phase is less than 20% by weight, it is difficult to sufficiently disperse the water-dispersible oil-absorbing polymer, and when it exceeds 80% by weight, it is difficult to prepare a water-in-oil formulation.

[0022] In one aspect of this disclosure, the size of the emulsified particles in the above-mentioned water-in-oil cosmetic composition can be 1-40 μm, preferably 1-30 μm, and more preferably 2-20 μm. The size of the emulsified particles in the above-mentioned water-in-oil cosmetic composition can be within the above-mentioned range by trapping a water-dispersible oil-absorbing polymer in the inner aqueous phase.

[0023] In one aspect of this disclosure, the aforementioned water-in-oil cosmetic composition may, without impairing the effects of the present invention, contain appropriate amounts of dispersants, thickeners, film-forming agents, pigments, emulsifying stabilizers, preservatives, UV blockers, moisturizers, antioxidants, alcohols, fragrances, pH adjusters, or natural extracts commonly used in water-in-oil cosmetic compositions, but is not limited thereto. The aforementioned thickener may include, but is not limited to, any one or more selected from the group consisting of distearate dimethylammonium hectorite, bentonite, organosilicon crosslinking polymers, and silicone resins. In one aspect of this disclosure, the aforementioned water-in-oil cosmetic composition may have dosage forms such as foundation, concealer, makeup base, BB cream, primer, lotion, cream, or wax, but is not limited thereto.

[0024] In one aspect of this disclosure, the above-described water-in-oil cosmetic composition may contain a second discontinuous phase (aqueous phase), and therefore may not contain the above-described water-dispersible oil-absorbing polymer.

[0025] Furthermore, the water-in-oil cosmetic composition according to this disclosure can be prepared by various methods known in the art, such as, but not limited to, the following methods. This disclosure provides a method for preparing a water-in-oil cosmetic composition containing a water-dispersible oil-absorbing polymer in an inner aqueous phase, comprising: (s1) heating and mixing an oil phase component to prepare an oil phase portion; and (s2) heating and mixing a water-dispersible oil-absorbing polymer and an aqueous phase component to prepare an aqueous phase portion, and then adding the aqueous phase portion to the oil phase portion.

[0026] The oil phase in step (s1) above may contain one or more oil phase components selected from the group consisting of oil components, emulsifiers, emulsion stabilizers, dispersants, thickeners, film-forming agents, and pigments. The oil phase in step (s1) above can be prepared by heating the oil phase components to 50-100 °C, preferably 60-90 °C. In step (s1) above, the oil phase may first be prepared by heating the oil components, emulsifiers, emulsion stabilizers, dispersants, thickeners, and film-forming agents, homogenizing them using a homogenizer, confirming the homogeneity, and then adding and completely dispersing the pigment.

[0027] The aqueous phase in step (s2) above may contain one or more components selected from the group consisting of water, emulsion stabilizers, and preservatives. The aqueous phase in step (s2) above can be prepared by heating the aqueous components to 50-90°C, preferably 60-80°C. The aqueous phase prepared in step (s2) above can be added to an oil phase in which pigments are dispersed and emulsified using a homogenizer to prepare a water-in-oil cosmetic composition.

[0028] Preferably, all ingredients described in this disclosure do not exceed the maximum usage limits specified in relevant regulations and standards of Korea, China, the United States, Europe, Japan, etc. (e.g., relevant regulations such as cosmetic safety standards (Korea), cosmetic safety technical specifications (China)). That is, preferably, the cosmetic composition according to this disclosure contains the ingredients according to the invention within the limits permitted by relevant regulations and standards of various countries or Europe.

[0029] The effects of the invention

[0030] The oil-in-water cosmetic composition disclosed herein exhibits significantly superior adhesion and durability without increasing the viscosity of the formulation by emulsifying a water-dispersible, oil-absorbing polymer dispersed in an inner aqueous phase. Simple Explanation of the Diagram

[0031] [Figure 1] is a graph showing the results of observing the particles of the composition of Example 1 using an optical microscope in Experimental Example 2; [Figure 2] shows the results of a comparative evaluation of the persistence of Example 1 and Comparative Example 3 in Experimental Example 3; [Figure 3] shows the results of a comparative evaluation of the moisturizing properties of Example 1 and Comparative Example 3 in Experimental Example 3; [Figure 4] shows the results of evaluating the mask contamination-related persistence of Example 1 and Comparative Example 3 in Experimental Example 4; and [Figure 5] is a graph showing the functional evaluation results of Example 1 and Comparative Example 3 in Experimental Example 5. Implementation

[0032] Hereinafter, to facilitate understanding of the present invention, detailed descriptions will be provided with examples and other details. However, embodiments of the present invention can be modified into various other forms, and the scope of the present invention should not be construed as limited to the following embodiments. The embodiments of the present invention are provided to provide a more complete explanation of the present invention to those skilled in the art.

[0033] [Preparation of the compositions of the examples and comparative examples] []

[0034] Table 1 below shows examples of WSP-005 and CL PMMA-W as water-dispersible oil-absorbing polymers.

[0035] [Table 1] Raw material name WSP-005 CL PMMA-W INCI Polymethylsilsesquioxane Methyl methacrylate crosspolymer Manufacturer Woosukchem Co., Ltd. chemiland Oil absorption 0.64cc / g 0.05cc / g Water dispersion Can Can Oil dispersion Can Can

[0036] In addition, Examples 1 and 2 and Comparative Examples 1 to 3 were prepared using the compositions shown in Table 2 below.

[0037] [Table 2] distinguish Ingredient name Comparative Example 1 Comparative Example 2 Example 1 Example 2 Comparative Example 3 Oil-absorbing polymers (water-dispersible) Polymethylsilsesquioxane - - 5 - - Methyl methacrylate crosspolymer - - - 5 - Oil-absorbing polymers (oil dispersions) Polymethylsilsesquioxane 5 - - - - Methyl methacrylate crosspolymer - 5 - - - Oil components Silicon oil 30 30 30 30 30 Ester oils 4 4 4 4 4 emulsifier PEG-10 polydimethylsiloxane 3 3 3 3 3 Sorbitol Sesquiisostearate 1 1 1 1 1 stearic acid 0.2 0.2 0.2 0.2 0.2 dispersant Distearyldimonium chloride 0.2 0.2 0.2 0.2 0.2 Thickener Distearate dimethylammonium lithium montmorillonite 0.4 0.4 0.4 0.4 0.4 Film-forming agent Trimethylsiloxy silicate 0.65 0.65 0.65 0.65 0.65 Polypropyl silsesquioxane 0.35 0.35 0.35 0.35 0.35 pigment Titanium oxide 11 11 11 11 11 iron oxide 1.5 1.5 1.5 1.5 1.5 Aqueous phase composition purified water Up to 100 Up to 100 Up to 100 Up to 100 Up to 100 Butylene glycol 4 4 4 4 4 glycerin 4 4 4 4 4 Emulsion stabilizers Sodium chloride 0.5 0.5 0.5 0.5 0.5 preservative 1,2-Hexanediol 1 1 1 1 1

[0038] The names and manufacturers of the raw materials for the oil-dispersible oil-absorbing polymers used in Comparative Examples 1 and 2 above are shown in Table 3 below.

[0039] [Table 3] Raw material name SESQ-101 SUNPMMA-P INCI Polymethylsilsesquioxane Methyl methacrylate crosspolymer Manufacturer N&M TECH Sunjin Chemical

[0040] The preparation methods of the compositions in the above embodiments and comparative examples are as follows. First, the oil phase components, emulsifier, emulsion stabilizer, dispersant, thickener, film-forming agent, and oil-absorbing polymer (oil dispersion) are added to an oil phase tank and heated to 80 °C. Then, homogenization is performed using a homogenizer to confirm the homogeneity. Next, pigment is added and completely dispersed. The aqueous phase components, emulsion stabilizer, preservative, and oil-absorbing polymer (water dispersion) are added to an aqueous phase tank and the raw materials are completely dissolved at 70 °C. Then, this solution is added to the oil phase tank containing the dispersed pigment and emulsified using a homogenizer to prepare a water-in-oil foundation emulsion.

[0041] [Experimental Example] [1] [Comparison of dispersions of oil-absorbing polymers with hydrophilic or lipophilic surfaces] []

[0042] A comparative experiment was conducted on the dispersibility of oil-in-water emulsion polymers with hydrophilic or lipophilic surfaces. The dispersibility of general oil-absorbing polymers and some oil-absorbing polymers with hydrophilic surface modifications was compared below.

[0043] [Table 4]

[0044] [Oil-absorbing polymer] Raw material name SESQ-101 BELSIL PMS MK POWDER WSP-005 INCI Polymethylsilsesquioxane Polymethylsilsesquioxane Polymethylsilsesquioxane Manufacturer N&M TECH WACKER CHEMIE AG Woosukchem Co., Ltd. Surface features Oil-loving Oil-loving Some are hydrophilic

[0045] [Table 5]

[0046] [Experimental Table] Control group 1 Control group 2 Experimental Group 1 Control group 3 Control group 4 Experimental Group 2 Comparison group 5 Comparison group 6 Experimental Group 3 SESQ-101 2g 2g 2g BELSIL PMS MK POWDER 2g 2g 2g WSP-005 2g 2g 2g purified water 40g 40g 40g 5g 5g 5g dipropylene glycol 40g 40g 40g 35g 35g 35g Dispersed state X X O O O O △ X O

[0047] The dispersion medium consisted of purified water, a polyol, or a combination of both. Dipropylene glycol was selected as the polyol because it had suitable viscosity and excellent dispersing power, but might induce a sticky feeling during use. To compare dispersibility, oil-absorbing polymers were added to the respective dispersion media, thoroughly mixed at room temperature, and the degree of powder aggregation was used for assessment.

[0048] In a dispersion medium composed of dipropylene glycol, control groups 3, 4, and experimental group 2 dispersed well. However, in a dispersion medium composed only of pure water, the polymers of control groups 1 and 2 did not disperse, and coagulation was observed. When a small amount of pure water was added after dispersion in dipropylene glycol, the dispersion of control groups 5 and 6 was very limited. This indicates that to ensure the dispersion stability of existing oil-absorbing polymers with hydrophobic surfaces in an aqueous phase, a large amount of polyol must be incorporated, and thickening or specific techniques are required.

[0049] In water-in-oil emulsions, when the polyol content in the aqueous phase exceeds 70%, limitations arise that hinder the user experience. For example, maintaining emulsion stability becomes difficult, resulting in a lack of cooling and moisturizing sensations, and potentially inducing a sticky feeling. From this perspective, water-dispersible oil-absorbing polymers can offer the advantage of providing a refreshing and dry user experience while maintaining emulsion stability.

[0050] [Experimental Example] [2] [Comparison of viscosity changes and user experience of water-in-oil cosmetic compositions] []

[0051] When the water-dispersible oil-absorbing polymer is dispersed in the aqueous phase as shown in Examples 1 and 2 above, or when the oil-dispersible oil-absorbing polymer is dispersed in the oil phase as shown in Comparative Examples 1 and 2, the viscosity changes and user experience of the water-in-oil cosmetic compositions are compared and shown in Table 6 below.

[0052] [Table 6] Comparative Example 1 Comparative Example 2 Example 1 Example 2 Initial viscosity (freshly prepared)* 3400 cPs 2400 cPs 2300 cPs 2100 cPs Topical △ O O O Adhesiveness** △ X O △ *Viscosity measurement: 25℃, 30 rpm, 1 min using an LVT Brookfield viscometer. **Spreadability and Adhesion: Apply an appropriate amount to the skin for evaluation. (X: below 2 points, △: 2~3.5, ○: 3.5~5.0 / Evaluation subjects: 20 female evaluators in their 20s and 30s)

[0053] In the test samples, for Comparative Example 2, Examples 1 and 2, it was confirmed that the viscosity was prepared to be low and the initial spreadability was excellent. In particular, in Examples 1 and 2, improved adhesion was perceived by rubbing the sample with fingers during the coating process.

[0054] Comparative Examples 1 and 2 confirm that the viscosity of the composition varies depending on the oil absorption of the polymer used. Furthermore, Comparative Examples 1 and 2 show that oil-dispersible, oil-absorbing polymers absorb oil components constituting the outer oil phase, causing the film components and thickener to concentrate, thereby producing the viscosity differences described above.

[0055] Furthermore, it is predicted that the initial viscosity of Examples 1 and 2 remains low because the water-dispersible oil-absorbing polymer dispersed in the inner aqueous phase is completely separated from the outer oil phase through the interface. Therefore, if the interface is disrupted by rubbing with fingers, it is predicted that the water-dispersible oil-absorbing polymer will absorb oil from the outer oil phase, thereby increasing viscosity and improving adhesion.

[0056] [Experimental Example] [3] [Example] [1] [Particle observation of the composition] []

[0057] After removing the pigment in Example 1, which exhibits excellent spreadability and adhesion, the particles were observed using an optical microscope. The optical microscope images shown in Figure 1 reveal emulsified particles of various sizes, ranging from 3 to 20 μm, and a presumed polymer composition was observed within them. These results indicate that the emulsified particles enlarge during the trapping of the water-dispersible, oil-absorbing polymer within the internal aqueous phase, and an increased ability to lock in moisture, similar to that of a hydrogel, is predicted.

[0058] [Experimental Example] [4] [Comparative experiment on persistence and moisturizing properties] []

[0059] To compare the persistence and moisturizing properties of oil-absorbing polymers with and without application, comparative experiments were conducted using Example 1 and Comparative Example 3 as subjects.

[0060] For persistence evaluation, each composition was uniformly coated onto waterproof paper and dried at 25 °C for 30 minutes. Then, oil-absorbing paper was placed on oil for 10 minutes, and the degree of oil seepage and the extent to which the coated cosmetic film was wiped off were evaluated. From the persistence evaluation results of Example 1 and Comparative Example 3 disclosed in Figure 2, it was confirmed that Comparative Example 3 had a greater amount of oil adhering to the oil-absorbing paper, and more of the coated cosmetic film was wiped off. Therefore, it can be seen that the water-dispersible oil-absorbing polymer in the composition of Example 1, after coating, improves persistence while absorbing residual oil.

[0061] For the moisturizing effect evaluation, the compositions of Example 1 and Comparative Example 3 were uniformly applied to the skin and set at 25 °C for 10 minutes. The moisture content was then measured using a skin moisture meter before application, 10 minutes after application, and 30 minutes after application. The changes in moisture content over time after application of Examples 1 and Comparative Example 3 were converted to the initial moisture content and are shown in Figure 3. The moisturizing effect evaluation results in Figure 3 confirm that in Example 1, the moisture content remained high, and the decrease in moisture content was small even after 30 minutes of application.

[0062] Through the aforementioned comparative experiments on persistence and moisturizing properties, it was confirmed that the water-dispersible oil-absorbing polymer can contain aqueous components for a certain period of time, thus significantly improving the dryness caused by rapid evaporation of moisture. Furthermore, even when the use of volatile oils is limited, the aforementioned water-dispersible oil-absorbing polymer can absorb residual oil after application, thereby firmly forming a cosmetic film and maintaining the cosmetic film for a long time against external physical factors.

[0063] Experimental Example 5: Evaluation of the persistence of mask contamination

[0064] To evaluate the durability of the mask under wearing conditions, appropriate amounts of the compositions of Example 1 and Comparative Example 3 were taken and evenly applied to the skin. Then, KF-94 masks were worn, and the test areas (left and right sides) were touched five times each with the same force. The degree of product contamination was observed with the naked eye and analyzed using an image analysis program. The experimental results are shown in Figure 4 and Table 7.

[0065] [Table 7] Water-dispersible oil-absorbing polymers Pixel value* Example 1 O 3569 Comparative Example 3 X 611691 *Analyze the measurements (pixels) of the product adhering to the mask fabric.

[0066] The above experimental results confirm that, in Example 1 using a water-dispersible oil-absorbing polymer, the mask showed significantly less contamination.

[0067] [Example] [6] [Sensory evaluation] []

[0068] For Example 1 and Comparative Example 3, spreadability, adhesion, stickiness, moisture feel, persistence, and overall satisfaction were evaluated. Twenty female consumers aged 30-40 years were included, and each item was evaluated on a 5-point scale; the results are shown in Figure 5. The sensory evaluation results confirm that Example 1, using a water-dispersible oil-absorbing polymer, demonstrated significantly superior performance in all aspects, including spreadability, adhesion, stickiness, immediate moisture feel, moisture feel over time (cooling effect), persistence, and overall satisfaction.

Claims

1. A water-in-oil cosmetic composition, wherein an aqueous phase contains a water-dispersible oil-absorbing polymer; wherein, The water-dispersible oil-absorbing polymer is polymethylsilsesquioxane, methyl methacrylate crosspolymer, or a mixture thereof, and the surface of the water-dispersible oil-absorbing polymer is modified to be hydrophilic; wherein the oil content is 20 to 80% by weight relative to the total weight of the composition.

2. The water-in-oil cosmetic composition as described in claim 1, wherein, The water-dispersible oil-absorbing polymer is 0.1 to 15% by weight relative to the total weight of the composition.

3. The water-in-oil cosmetic composition as described in claim 1, wherein, The emulsified particles in this water-in-oil cosmetic composition have a size of 1~40 μm.

4. A method for preparing a water-in-oil cosmetic composition as claimed in claim 1, comprising a water-dispersible oil-absorbing polymer in an inner aqueous phase, wherein the water-dispersible oil-absorbing polymer is a polymethylsilsesquioxane, a methyl methacrylate crosspolymer, or a mixture thereof, and the surface of the water-dispersible oil-absorbing polymer is modified to be hydrophilic, wherein the oil content is 20 to 80% by weight relative to the total weight of the composition, the method comprising: (s1) The step of heating and mixing an oil phase component to prepare an oil phase portion, wherein the oil phase component comprises the oil component; and (s2) The step of heating and mixing the water-dispersible oil-absorbing polymer and an aqueous phase component to prepare an aqueous phase portion, and then adding the aqueous phase portion to the oil phase portion.

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