Oil-in-water type cosmetic composition with emulsifier-free manuifactured by apparatus for membrane emulsification

Abstract

The emulsifier-free water-in-oil type cosmetic composition disclosed in the present invention comprises an oil phase comprising a cationic polymer and oil and an aqueous phase comprising an anionic polymer and purified water, and is manufactured using a membrane emulsification device, wherein it comprises coarse oil particles having an average diameter of 500 μm or more formed by a polymer membrane composed of the cationic polymer and the anionic polymer.

Description

Technology Field

[0001] The present invention relates to an emulsifier-free water-in-oil cosmetic composition manufactured using a membrane emulsification device. More specifically, the invention relates to a water-in-oil cosmetic composition in which coarse oil particles with excellent size uniformity are produced using a membrane emulsification device, and the coarse oil particles are formed by being surrounded by a polymer membrane, thereby improving the stability of the emulsified particles and enhancing the aesthetic appeal by improving the transparency of the composition, while allowing the oil particles to gently permeate the skin when applied. Background Technology

[0002] Cosmetics have the function of protecting the skin from external factors such as ultraviolet rays and environmental pollution, and delaying aging. Most cosmetics exist in a state where the aqueous phase is dispersed in the oil phase, or the oil phase is dispersed in the aqueous phase. In this case, the use of emulsifiers (surfactants) is essential to maintain a stable dispersion state.

[0003] Emulsifiers are molecules with an amphiphilic structure composed of hydrophilic groups that are easily affined for water and hydrophobic groups that are easily affined for oil. Emulsifiers are located at the interface between the oil phase and the water phase and play a role in lowering interfacial tension. They form an oil / water interfacial film at the phase boundary, preventing particles from coalescing with each other.

[0004] Emulsifiers can be classified according to various properties such as use, performance, and chemical structure; generally, they are divided into ionic and nonionic types based on their dissociation properties in water. Ionic emulsifiers, which dissociate when dissolved in water, are further divided into anionic, cationic, and amphoteric emulsifiers. A representative example of anionic emulsifiers is soap, which is a fatty acid salt, while a representative example of cationic emulsifiers is quaternary ammonium compounds. Additionally, nonionic emulsifiers, which do not dissociate into ions when dissolved in water, have diverse hydrophilic portions such as glycerol, polyglycerol, sorbitan, and polyoxyethylene glycol, and are formed by ester or ether bonds with lipophilic portions such as fatty acids and fatty alcohols.

[0005] Although many commercially available emulsifiers are used after receiving safety approval, they can still cause skin irritation or allergies because they disrupt the phospholipid layer through surface interactions within skin cells. When the lipid layer is lost, the protective barrier weakens and skin permeability increases. A more permeable barrier easily loses moisture, resulting in dull and dry skin. Furthermore, it facilitates the penetration of foreign substances, leading to sensitive skin reactions such as allergies.

[0006] However, if an emulsifier is not included, the hardness of the oil-in-water type decreases, increasing the likelihood of combining with oil particles other than the intended oil, which can lead to larger oil particle sizes.

[0007] Therefore, there is a demand for water-in-oil cosmetic compositions that can maintain the stability of oil particles without containing separate emulsifiers, enhance visual aesthetics, minimize skin irritation upon application, and maximize overall user experience, including spreadability and absorption.

[0008] In the cosmetics industry, capsules are primarily utilized to prevent the spoilage of specific ingredients. Traditionally, cosmetics have been developed by processing the capsules separately from the cosmetic composition and then mixing them with the composition. However, this conventional method is cumbersome and costly, and leaves capsule residue on the skin after application, causing discomfort to the user. Therefore, there is a need to develop a cosmetic composition containing stable capsules that automatically form within the cosmetic without a separate manufacturing process, allowing the product to maintain a consistent state even during long-term storage.

[0009] Patent Document 1 discloses that a dispersed phase material is encapsulated by a polymer membrane, but the average size of the dispersed phase material is small, less than 500 µm, and it is different in that it is simply by stirring rather than membrane emulsification. In this case, there are problems such as reduced stability, size uniformity, and transparency of the emulsified particles.

[0010] In this invention, the invention was completed by preparing an in-water type composition that stably forms coarse oil particles encapsulated by a polymer membrane and has excellent size uniformity. Prior art literature

[0011] Patent Document 1: Korean Registered Patent Publication No. 10-2380635 Patent Document 2: Korean Registered Patent Publication No. 10-1868854 The problem to be solved

[0012] One objective of the present invention is to provide an oil-in-water type cosmetic composition that contains oil particles including oil phase and water phase components, thereby maintaining the stability of the emulsion particles without containing an emulsifier, improving aesthetics, and allowing the oil particles to gently penetrate the skin when applied.

[0013] Specifically, the water-in-oil type cosmetic composition of the present invention is formed by using a membrane emulsification device to produce coarse oil particles with excellent size uniformity, and the coarse oil particles are surrounded by a polymer membrane, thereby improving the stability of the emulsified particles and improving the transparency of the composition, which in turn improves the aesthetic appeal.

[0014] However, the technical problems that the present invention aims to solve are not limited to those mentioned above, and other unmentioned problems will be clearly understood by those skilled in the art from the description below. means of solving the problem

[0015] According to one embodiment of the present invention, an emulsifier-free oil-in-water type cosmetic composition that does not contain an emulsifier is provided, comprising an oil phase containing a cationic polymer and oil and an aqueous phase containing an anionic polymer and purified water, and manufactured using a membrane emulsification device, wherein the composition comprises coarse oil particles having an average diameter of 500 μm or more formed by a polymer membrane composed of the cationic polymer and the anionic polymer.

[0016] The present invention may be an emulsifier-free oil-in-water type cosmetic composition in which the oil phase is heated and passed through a membrane module having pores of 10 to 50 μm in size to form oil particles in the heated water phase, and the water phase containing the oil particles is stirred and cooled to room temperature to produce the coarse oil particles.

[0017] In the present invention, the membrane emulsification device may be an emulsifier-free water-in-water type cosmetic composition comprising: a dispersed phase tank for receiving the oil phase; a pressurizing device for pressurizing and discharging the oil phase within the dispersed phase tank; a continuous phase tank for receiving the aqueous phase; and a membrane module installed within the continuous phase tank, into which the oil phase discharged by the pressurizing device is injected and discharged into the aqueous phase tank.

[0018] In the present invention, the cationic polymer comprises amodimethicone or a derivative thereof, and the anionic polymer may be an emulsifier-free water-in-oil type cosmetic composition comprising polyacrylic acid.

[0019] In the present invention, the oil may be an emulsifier-free oil-in-water type cosmetic composition comprising general oil and silicone oil.

[0020] In the present invention, the coarse oil particles may be an emulsifier-free oil-in-water type cosmetic composition in which oil particles having a diameter of 700 to 1,200 μm are distributed in a ratio of 70% or more, and the average diameter of the coarse oil particles is 650 to 1,000 μm. Effects of the invention

[0021] The water-in-oil type cosmetic composition provided in the present invention produces coarse oil particles with excellent size uniformity using a membrane emulsification device, and the coarse oil particles are formed by being surrounded by a polymer membrane, which improves the stability of the emulsified particles and prevents them from combining with other oils, while also having low hardness, thereby maximizing the overall user experience, including spreadability and absorption, when applied to the skin.

[0022] In addition, the water-in-oil type cosmetic composition of the present invention can improve the transparency of the composition, thereby enhancing aesthetic appeal. Brief explanation of the drawing

[0023] Figure 1 shows a schematic diagram of a membrane emulsification apparatus used in the manufacture of the water-in-water type cosmetic composition of the present invention. FIG. 2 shows a schematic side cross-sectional view of a membrane emulsification device used in the manufacture of the water-in-water type cosmetic composition of the present invention. FIGS. 3 to 11 are photographs showing cosmetic compositions according to embodiments and comparative examples of the present invention. Specific details for implementing the invention

[0024] Hereinafter, to explain more specifically, examples will be provided for detailed description. However, the following examples are illustrative and the scope of the present invention is not limited thereto.

[0025] According to one embodiment of the present invention, the invention relates to an emulsifier-free oil-in-water type cosmetic composition comprising an oil phase containing a cationic polymer and oil and an aqueous phase containing an anionic polymer and purified water, manufactured using a membrane emulsification device, and containing coarse oil particles with an average diameter of 500 μm or more formed by a polymer membrane composed of the cationic polymer and the anionic polymer.

[0026] The term 'oil-in-water type' in this specification refers to an emulsion in which oil droplets are dispersed in water, also known as an o / w type emulsion, with milk, mayonnaise, and vanishing cream being typical examples. It is also a counterpart to the 'water-in-oil type' emulsion, which refers to a milky liquid or emulsion in which water is dispersed as fine particles within an oil and is in an emulsified state.

[0027] The above oil may be provided to alter, dissolve, or suspend the physical properties of other substances. Suitable oils include, but are not limited to, natural oils such as coconut oil; hydrocarbons such as mineral oil and hydrogenated polyisobutene; fatty alcohols such as octyldodecanol; esters such as C12-C15 alkyl benzoates; diesters such as propylene diperagonate; triesters such as glyceryl trioctanoate; and silicone oils such as phenyl trimethione, dimethicone, cyclomethicone, polydimethylsiloxane, and silicone gum.

[0028] The above oil components may also be a mixture of oils of different viscosities.

[0029] Examples of low-viscosity oils include isotridecyl isononanoate, PEG-4 diheptanoate, isostearyl neopentanoate, tridecyl neopentanoate, cetyl octanoate, cetyl palmitate, cetyl ricinoleate, cetyl stearate, cetyl myristate, cocodicaprylate / caprate, decyl isostearate, isodecyl oleate, isodecyl neopentanoate, isohexyl neopentanoate, octyl palmitate, dioctyl maleate, tridecyl octanoate, myristyl myristate, octyldodecanol, or a mixture of octyldodecanol, acetylated lanolin alcohol, cetyl acetate, isododecanol, polyglyceryl 3-diisostearate, or a mixture thereof.

[0030] High-viscosity oils include castor oil, lanolin and lanolin derivatives, triisocetyl citrate, sorbitan sesquioleate, C6-18 triglycerides, capryl / capric / triglycerides, coconut oil, corn oil, cottonseed oil, glyceryl triacetyl hydroxysterate, glyceryl triacetyl ricinoleate, glyceryl trioctanoate, hydrogenated castor oil, castor oil / IPDI copolymer, linseed oil, mink oil, olive oil, palm oil, rapeseed oil, soybean oil, sunflower oil, tallow, tricaprin, trihydroxystearin, triisostearin, trilaurin, trilinolein, trimyristin, triolein, tripalmitin, tristearin, walnut oil, wheat germ oil, cholesterol, or mixtures thereof. Among other optional non-silicone fatty substances, it may be mentioned that they may consist of mineral oils, such as liquid paraffin or liquefied petroleum; animal oils, such as perhydrosqualene or arara oil; or optionally vegetable oils such as sweet almond, calophyllum, palm, castor, avocado, jojoba, olive, or cereal germ oil. Additionally, esters of lanolinic acid, oleic acid, lauric acid, stearic acid, or myristic acid, for example, alcohols such as oleyl alcohol, linoleyl or linoleenyl alcohol, isostearyl alcohol, or octyldodecanol; or acetylglycerides, octanoates, decanoates, or lisinolates of alcohols or polyalcohols may be used.

[0031] In one embodiment of the present invention, coarse oil particles are formed through encapsulation by the polymer membrane, and the polymer membrane is formed by the coacervation of cationic polymers and anionic polymers.

[0032] In the present invention, the oil phase comprises the cationic polymer, and the cationic polymer is a polymer having cationic functional groups, and representative examples of cationic functional groups include primary, secondary, and tertiary amine functional groups existing in the form of ammonium cations.

[0033] The above cationic polymer is a polymer formed by the polymerization of monomers, and at least one of the functional groups includes a cationic group such as a primary, secondary, or tertiary amine functional group.

[0034] For example, the cationic polymer may include a silicone polymer containing an amine functional group, a polysaccharide containing an amine functional group, a polypeptide containing an amine functional group, or a polyethylimine containing an amine functional group.

[0035] Specifically, the silicone polymer containing the amine functional group comprises a copolymer of amodimethicone or a derivative thereof, aminopropyl dimethicone, bis-isobutyl PEG-14 / amodimethicone and bis-hydroxy / methoxy amodimethicone, the polysaccharide containing the amine functional group comprises chitosan or a guar gum derivative (guar hydroxypropyltrimononium chloride), the polypeptide containing the amine functional group comprises polylysine, and the polyethylimine containing the amine functional group may comprise linear or branched polyethyleneimine.

[0036] In the present invention, the aqueous phase comprises the anionic polymer, and the anionic polymer is a polymer having an anionic functional group, and representative examples of the anionic functional group include primary, secondary, and tertiary amine functional groups existing in the form of ammonium cations.

[0037] The above anionic polymer is a polymer formed by the polymerization of monomers, and at least one of the functional groups includes an anionic group such as a carboxylic acid functional group.

[0038] For example, the anionic polymer may include a linear or branched polymer or copolymer of one or more monomers selected from the group consisting of acrylic acid, maleic acid, acrylamide, alkyl acrylates, and alkyl methacrylates.

[0039] Specifically, the above anionic polymer may include polyacrylic acid.

[0040] According to one embodiment of the present invention, it can be manufactured using a membrane emulsification device.

[0041] The above membrane emulsification device comprises: a dispersion phase tank (11) for receiving the oil phase; a pressurizing device for pressurizing and discharging the oil phase within the dispersion phase tank (11); a continuous phase tank (21) for receiving the aqueous phase; and a membrane module (23) installed within the continuous phase tank (21), into which the oil phase discharged by the pressurizing device is injected and discharged into the continuous phase tank as the aqueous phase.

[0042] FIG. 1 is a schematic diagram of a membrane emulsification apparatus used in the manufacture of an in-water type cosmetic composition of the present invention. FIG. 2 is a schematic cross-sectional view of a membrane emulsification apparatus used in the manufacture of an in-water type cosmetic composition of the present invention.

[0043] Referring to FIGS. 1 and 2, the water-in-water type cosmetic composition of the present invention is manufactured using the "membrane emulsification device" of Korean Registered Patent Publication No. 10-1868854.

[0044] The membrane emulsification device of the present invention comprises a dispersed phase tank (11) for receiving an oil phase with a dispersed phase solution, a continuous phase tank (21) for receiving an aqueous phase with a manufactured continuous phase solution, and a flexible transfer pipe (31) for transferring the oil phase in the dispersed phase tank (11) into the continuous phase tank (21).

[0045] The dispersed phase tank (11) is equipped with a pressurizing device (not shown) that pressurizes the oil phase inside and discharges it to the outside.

[0046] The pressurizing device applies pressure to the inside of the dispersed phase tank (11) using nitrogen or compressed air. The oil phase, which is pressurized and discharged by the pressurizing device, is transferred to the continuous phase tank (21) by the transfer pipe (31).

[0047] An impeller (13) capable of stirring or mixing the oil phase mixture is installed inside the dispersion tank (11). Additionally, the dispersion tank (11) is equipped with a double jacket structure capable of circulating hot water, steam, or cold water to maintain a constant temperature of the internal solution.

[0048] A first sensor (15) for detecting the level of the oil phase is installed inside the dispersed phase tank (11).

[0049] According to the double jacket structure of the above dispersion tank (11), the oil phase can be heated and transported.

[0050] In the continuous phase tank (21), a membrane module (23) is installed to which an oil phase, discharged by the pressurizing device of the dispersed phase tank (11) and transported through the transfer pipe (31), is injected.

[0051] The continuous phase tank (21) has a double jacket structure capable of circulating hot water, steam, or cold water to maintain a constant temperature of the internal solution.

[0052] A second sensor (25) for detecting the water level of the water is installed inside the continuous tank (21).

[0053] Additionally, a stirring impeller (27) is installed inside the continuous phase tank (21). The stirring impeller is positioned above and below the horizontally connected membrane module (23) and rotates by a motor (28) provided outside the continuous phase tank (21) to simultaneously generate a flow of water on both sides of the membrane (23), thereby allowing the dispersed phase droplets passing through the micropores of the membrane (23) to be easily separated and discharged into the water.

[0054] The membrane emulsification device according to the present invention is characterized by having a compensation means that compensates for a change in pressure difference caused by the difference in water levels detected by the first sensor (15) and the second sensor (25) so that the pressure difference is maintained at a constant level.

[0055] As illustrated in FIG. 2, one example of the compensation means includes a lifting device (41) as a water level control device for changing the water level of a dispersed tank (11). The lifting device (41) is a device for raising and lowering the dispersed tank (11) in an up-and-down direction and is configured to include a support member (41a) that supports the dispersed tank (11) from its lower side upward, a lifting rail (41b) that is tubularly coupled to the support member (41a), and a driving motor (41c) that moves the support member (41a) relative to the lifting rail (41b) in an up-and-down direction.

[0056] In the manufacture of macro-emulsion, as the water level in the continuous phase tank (21) rises, the back pressure on the dispersed phase tank increases. Accordingly, the controller (50) calculates the pressure difference based on the pressure measured by the first sensor (15) and the second sensor (25) and controls the lifting device (41) so that the pressure difference is maintained constant.

[0057] To produce the above-mentioned coarse oil particles, the above-mentioned oil phase is heated and passed through a membrane module (23) having pores of 10 to 50 μm in size to form oil particles in the heated water phase, and the water phase containing the oil particles is stirred and cooled to room temperature.

[0058] Specifically, when a pressurizing device (not shown) in the dispersed phase tank (11) operates to pressurize the oil phase in the dispersed phase tank (11), the oil phase is discharged to the continuous phase tank (21) through the transfer pipe (31) and supplied to the membrane module (23) in the continuous phase tank (21). In the membrane module (23), the dispersed phase solution passes through the pores and is macro-emulsified and ejected as droplets to form oil particles, and these oil particles circulate in the continuous phase tank (31), thereby avoiding contact between the oil particles and preventing the particles from clumping together.

[0059] The above oil phase contains a cationic polymer, and the surface of the droplet formed by passing through the pores of the membrane module (23) is surrounded by the anionic polymer of the above water phase, and encapsulation of the particle occurs by coacervation, thereby forming the polymer membrane.

[0060] Here, the membrane module has a structure in which a plurality of porous membranes are arranged in parallel, and the tubular or plate-shaped porous membranes may be sealed to allow the oil phase to pass through the micropores.

[0061] For example, the membrane module may include a membrane having pores of size 10 to 50 μm.

[0062] The above membrane may be a ceramic membrane and may include countless micropores on its surface.

[0063] As the oil particles contained in the aqueous phase of the continuous phase tank (21) cool down to room temperature, the oil particles are also cooled together, allowing them to stably maintain a spherical droplet shape.

[0064] According to one embodiment of the present invention, the composition comprises coarse oil particles with an average diameter of 500 μm or more formed by a polymer membrane composed of the cationic polymer and the anionic polymer.

[0065] The above-mentioned coarse oil particles have a large particle size, so they can be visually recognized by the user and provide an aesthetic effect. In addition, by encapsulating the oil particles within a polymer membrane, the composition itself can become transparent, thereby enhancing the aesthetic sense.

[0066] The above coarse oil particles consist of oil particles having a diameter of 700 to 1,200 μm distributed in an amount of 70% or more.

[0067] The coarse oil particles of the cosmetic composition prepared using the membrane emulsification device of the present invention may have a uniform particle size, and as described above, the aggregation of the particles is prevented and the stability of the particles can be improved as they are encapsulated through the polymer membrane.

[0068] Preferably, the average diameter of the coarse oil particles may be 650 to 1,000 µm.

[0069] The type of solvent that may be further added to the above-mentioned water-in-oil cosmetic composition is not particularly limited; for example, water, saline solution, DMSO, or a combination thereof may be used, but purified water may suitably be used. Additionally, whitening agents, moisturizers, vitamins, sunscreens, perfumes, dyes, antibiotics, antibacterial agents, and antifungal agents may be included as needed.

[0070] In the present invention, the above-described water-in-oil type cosmetic composition may be characterized by not containing an emulsifier.

[0071] In the present invention, the water-in-oil type cosmetic composition may take the form of a solution, an emulsion, a viscous mixture, etc., and may be a lotion, nourishing lotion, nourishing essence, massage cream, beauty bath additive, body lotion, body milk, bath oil, baby oil, baby powder, shower gel, shower cream, sunscreen lotion, sunscreen cream, tanning cream, skin lotion, skin cream, UV protection cosmetic, foundation, makeup base, BB cream, skin cover, concealer, lipstick, lip gloss, lip balm, face powder, two-way cake, eyeshadow, eyeliner, mascara, cheek color, eyebrow pencils, cleansing milk, hair removal agent (for cosmetics), face and body lotion, face and body cream, skin whitening cream, hand lotion, hair lotion, cosmetic cream, jasmine oil, bath soap, liquid soap, beauty soap, shampoo, hand sanitizer (hand cleaner), It may be manufactured in the form of medicinal soap (non-medical), cream soap, facial wash, body cleanser, scalp cleanser, hair rinse, cosmetic soap, teeth whitening gel, toothpaste, etc. To this end, the above-mentioned water-in-oil type cosmetic composition may further include a solvent or a suitable carrier, excipient, or diluent that is conventionally used in the manufacture of cosmetic compositions, within a range that does not impair the purpose and effect of the water-in-oil type cosmetic composition of the present invention.

[0072] The above-described water-in-oil type cosmetic composition may, if necessary, include ingredients that are widely known and used by experts in the field as conventional optional ingredients for the formulation of each formulation, in addition to the composition described above, while maintaining basic physical properties and quality.

[0073] In addition, any functional ingredient widely known and used by experts in the field, such as UV blocking ingredients, whitening ingredients, anti-wrinkle ingredients, antioxidant ingredients, moisturizing ingredients, and antibacterial ingredients, can be used to improve affinity with the skin and effectively act on the skin within a range that does not impair the purpose and effect of the water-in-oil type cosmetic composition of the present invention.

[0074] The present invention will be described in more detail below through examples. These examples are intended solely to explain the present invention more specifically, and it will be obvious to those skilled in the art that the scope of the present invention is not limited by these examples according to the gist of the invention.

[0076] Examples

[0077] Examples 1–3 and Comparative Examples 1–3

[0078] A composition was prepared according to the content of Table 1 below, while maintaining the overall temperature of the apparatus shown in Fig. 1 at 70 to 90°C. After filling the DP TANK with the oil phase and the CP TANK with aqueous phase 1, the DP TANK was pressurized with nitrogen or compressed air. As the oil phase in the DP TANK was discharged into the aqueous phase in the CP TANK through the pores (diameter 50 μm) of the membrane connected inside the CP TANK, oil droplets of a certain size were formed. At this time, the stirring speed was maintained at 160 rpm and the stirring temperature at 80°C. Once the discharge of the oil phase in the DP TANK was completed, the apparatus was cooled, and aqueous phase 2 (an alkaline solution such as arginine, thormethamine, NaOH, etc.) was added to the CP TANK to thicken the carbomer, thereby maintaining and stabilizing the dispersed state of the oil droplets.

[0080] Comparative Example 4

[0081] The composition of Example 2 above is prepared, and an oil phase is added to aqueous phase 1 and mixed with an overhead mixer, then homogenized by injection through a static mixer to obtain a fine dispersion, and the fine dispersion is slowly mixed with aqueous phase 2 to prepare the final composition.

[0082] ingredient Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 oil (g) Phenyltrimethicone 15 15 15 15 15 15 MCT OIL 27.99 27.97 27.9 28 27.97 28 Jojoba oil 5 5 5 5 5 5 Castor Oil / IPDI Copolymer 2 2 2 2 2 2 Amodimethicon 0.01 0.03 0.1 0 0.03 0 Water 1(g) purified water 36.78 36.78 36.78 39.98 39.98 36.78 propanediol 3 3 3 3 3 3 1,2-hexanediol 2 2 2 2 2 2 glycerin 5 5 5 5 5 5 Carbomer 0.1 0.1 0.1 0 0 0.1 EDTA 0.02 0.02 0.02 0.02 0.02 0.02 Water 2(g) purified water 3 3 3 0 0 3 Arginine 0.1 0.1 0.1 0 0 0.1

[0083] As shown in Table 1 above, water-in-oil type cosmetic compositions containing each component of Examples 1 to 3 and Comparative Examples 1 to 3 were prepared according to the above preparation example, and then the particle state and feel of use were evaluated and are shown in Table 2 below.

[0084] Specifically, the particle state of the water-in-oil type cosmetic composition prepared with the composition of Table 1 above was observed visually to determine the degree of particle formation, where ◎ indicated very stable particle formation, ○ indicated stable particle formation, △ indicated non-uniform particle formation, and X indicated particle destruction. In addition, the texture was expressed by evaluating the intensity of the oil particles on a scale of 1 to 5. When applied to the back of the hand, 1 indicated a softness where the particle texture is barely felt, 2 indicated a softness where the particle texture feels stable, 3 indicated a normal level, 4 indicated a hardness, and 5 indicated a very hard particle texture that requires multiple applications to spread on the skin.

[0085] The distribution of oil particles was determined by observing the composition using an electron microscope to measure particle diameters, and the extent to which particles of specific sizes were distributed was observed and recorded.

[0086] result Example 1 Example 2 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Particle state (appearance) ○ ◎ ◎ X X △ ◎ Usage sensation (strength) 2 2 2 1 1 2 2 Particle distribution 700~1,200 µm (%) 70 84 77 0 0 27 3 Average particle diameter (um) 680 820 790 - - 430 320

[0087] Examples 4, 5 and Comparative Examples 5-10

[0088] Each composition was prepared according to the composition of Example 2 above, with membrane pore size, stirring speed and temperature conditions in the CP TANK as shown in Table 3 below.

[0089] Membrane pore size (um) Stirring speed (RPM) Stirring temperature (°C) Example 2 50 160 80 Example 4 50 80 80 Example 5 50 130 80 Comparative Example 5 10 80 80 Comparative Example 6 10 160 80 Comparative Example 7 20 80 80 Comparative Example 8 20 160 80 Comparative Example 9 50 60 80 Comparative Example 10 50 200 80

[0090] Subsequently, the particle distribution and average diameter of Examples 4 and 5 and Comparative Examples 5 to 10 above are shown in Table 4 below.

[0091] FIGS. 3 to 11 are photographs showing cosmetic compositions according to embodiments and comparative examples of the present invention.

[0092] Specifically, FIG. 3 is a photograph of the composition according to Example 2, FIG. 4 is a photograph of the composition according to Example 4, FIG. 5 is a photograph of the composition according to Example 5, FIG. 6 is a photograph of the composition according to Comparative Example 5, FIG. 7 is a photograph of the composition according to Comparative Example 6, FIG. 8 is a photograph of the composition according to Comparative Example 7, FIG. 9 is a photograph of the composition according to Comparative Example 8, FIG. 10 is a photograph of the composition according to Comparative Example 9, FIG. 11 is a photograph of the composition according to Comparative Example 10.

[0093] Particle distribution 700~1,200 µm (%) Average particle diameter (um) Example 2 84 820 Example 4 73 1,130 Example 5 96 930 Comparative Example 5 5 320 Comparative Example 6 0 210 Comparative Example 7 27 610 Comparative Example 8 7 550 Comparative Example 9 23 1,350 Comparative Example 10 35 640

[0094] Referring to Tables 3 and 4 above, it was confirmed that, according to the embodiments of the present invention, a cosmetic composition can be prepared to have the coarse particle distribution and average particle diameter desired in the present invention when the composition, membrane pore size, stirring speed, and temperature conditions are applied. It was found that if the pore size of the membrane is too small, as in Comparative Examples 5 to 8, there is a problem that the particle size also becomes small; if the stirring speed is too slow, as in Comparative Example 9, the particle diameter increases excessively; and if the stirring speed is too fast, as in Comparative Example 10, there is a problem that the particles are broken down and the particle diameter becomes small.

[0095] Therefore, when a cosmetic composition containing coarse oil particles containing a polymer membrane is prepared using the membrane emulsification device of the present invention, the oil particles do not coalesce with each other and form uniform oil particles, thereby improving the size uniformity of the particles and enabling the preparation of an oil-in-water type cosmetic composition with improved aesthetics and visible particles. Furthermore, not only is stable production of coarse oil particles possible, but productivity is also improved. In addition, it was confirmed that there is critical significance in being able to prepare a cosmetic composition with excellent usability due to the softness of the oil particles.

Claims

Claim 1 An emulsifier-free oil-in-water type cosmetic composition comprising an oil phase containing a cationic polymer and oil and an aqueous phase containing an anionic polymer and purified water, manufactured using a membrane emulsification device, wherein the composition comprises coarse oil particles having an average diameter of 500 μm or more formed by a polymer membrane composed of the cationic polymer and the anionic polymer, wherein the cationic polymer comprises amodimethicone or a derivative thereof, the anionic polymer comprises polyacrylic acid, and the oil comprises general oil and silicone oil, wherein the oil phase is heated and passed through a membrane module having pores of 10 to 50 μm in size to form oil particles within the heated aqueous phase, and the aqueous phase containing the oil particles is stirred at a speed of 80 to 130 rpm and cooled to room temperature to produce the coarse oil particles. Claim 2 delete Claim 3 An emulsifier-free water-in-water type cosmetic composition according to claim 1, wherein the membrane emulsification device comprises: a dispersed phase tank for receiving the oil phase; a pressurizing device for pressurizing and discharging the oil phase within the dispersed phase tank; a continuous phase tank for receiving the aqueous phase; and a membrane module installed within the continuous phase tank, into which the oil phase discharged by the pressurizing device is injected and discharged into the aqueous phase into the continuous phase tank. Claim 4 delete Claim 5 delete Claim 6 An emulsifier-free oil-in-water type cosmetic composition according to claim 1, wherein at least 70% of the coarse oil particles are oil particles having a diameter of 700 to 1,200 µm, and the average diameter of the coarse oil particles is 650 to 1,000 µm.

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