Oil-in-water cosmetic composition with water resistance

Abstract

The present invention relates to an oil-in-water type cosmetic composition having water resistance, the oil-in-water type cosmetic composition containing an emulsifier and a polymer, thereby increasing the contact angle with water and imparting a water resistance function, and as a result, the oil-in-water type cosmetic composition has a high durability that is not easily removed by water or sweat together with an excellent feeling of use specific to oil-in-water types.

Description

Technical Field

[0001] This invention relates to water-in-oil cosmetic compositions that are water-resistant. Background Technology

[0002] Cosmetics were originally intended to enhance or restore the skin's natural defenses against external environmental factors such as dust, chemicals, ultraviolet rays, and microorganisms, as well as internal substances like water, fat, and electrolytes. Cosmetics can be broadly categorized into basic cosmetics, which prepare the skin after cleansing and are used for effective makeup application, and color cosmetics, which brighten the complexion, correct skin tone and imperfections, and add color.

[0003] Emulsification refers to the process of dispersing other immiscible liquids into fine particles within a single liquid. Such a liquid state is called an emulsion. For example, when the fine particles are water particles, it is a water-in-oil emulsion; when the fine particles are oil particles, it is an oil-in-water emulsion. Generally, emulsification aims to semi-permanently disperse other liquids within a single liquid, thus requiring surfactants or emulsifiers. Surfactants possess both a hydrophilic (water-loving) and a hydrophobic (water-repelling) portion within a single molecule, helping to stabilize the fine particles dispersed within the liquid. Surfactants reside at the interface between two liquids, reducing surface tension and forming an oil / water interfacial film to prevent particle aggregation. Such surfactants can be chemical surfactants or similar surfactants, as well as polymers with amphiphilic properties.

[0004] While water-in-oil emulsions are lightweight and offer a superior user experience, their drawback lies in their relatively low contact angle with water, making them easily removed by water or sweat. In recent years, attempts have been made to improve the durability and water resistance of water-in-oil cosmetic compositions, including the use of spherical powders (Korean Patent No. 10-2482662) or the formation of a wax emulsion layer around the aqueous phase (Korean Patent No. 10-2655365). However, a cosmetic composition that adjusts the contact angle of the water-in-oil emulsion to impart water resistance has not yet been developed.

[0005] Existing technical documents

[0006] Patent documents

[0007] Korean Patent No. 10-2482662

[0008] Korean Patent No. 10-2655365 Summary of the Invention

[0009] The purpose of this invention is to provide an oil-in-water cosmetic composition.

[0010] One embodiment of the present application provides an oil-in-water cosmetic composition containing 0.05 to 0.2% by weight of an emulsifier and 0.05 to 1.0% by weight of a polymer.

[0011] The "emulsifier" used in the present application is one of surfactants, and refers to a compound that can reduce the surface tension of the interface where a liquid (oil) and a liquid (water) come into contact with each other when they are mixed with each other. In general, in the preparation of an oil-in-water emulsion, a water-soluble emulsifier, i.e., a water-soluble emulsifier having a high value (10 to 15) of a hydrophilic-lipophilic balance (HLB) is suitable, and for a water-in-oil emulsion, an oil-soluble emulsifier having a strong lipophilicity, i.e., an oil-soluble emulsifier having a low value (4 to 8) of HLB is suitable.

[0012] According to one embodiment of the present application, the above emulsifier used in the oil-in-water emulsion can contain one or more selected from the group consisting of cetearyl olivate (50) / sorbitan olivate (50), polysorbate 60, cetearyl olivate, sorbitan olivate, glyceryl stearate SE, polyglyceryl-3 distearate, and glyceryl stearate citrate.

[0013] Preferably, the above emulsifier can be cetearyl olivate (50) / sorbitan olivate (50) and polysorbate 60.

[0014] The above emulsifier can be 0.05 to 0.2% by weight or 0.05 to 0.1% by weight, based on the total weight of the cosmetic composition. When the above emulsifier is contained in less than 0.05% by weight, the oil is not finely dispersed, and when the emulsifier is more than 0.2% by weight, a water resistance effect cannot be expected.

[0015] The "polymer" used in the present application is a high molecular weight body in which chemical repeating unit structures are connected, and in cosmetic compositions, it is mainly used for the purpose of improving texture, and also for product stability.

[0016] According to one embodiment of the present application, the above polymer can contain one or more selected from the group consisting of acrylates / C10-30 alkyl acrylate crosspolymer, acryloyldimethyltaurine ammonium / vinyl pyrrolidone copolymer, carbomer, sodium polyacrylate, hydroxyethyl acrylate / sodium acryloyldimethyl taurate copolymer, sodium polyacryloyl dimethyl taurate, and acryloyl dimethyl taurine ammonium / behenyl alcohol polyether-25 methacrylate crosspolymer.

[0017] Preferably, the above polymer can be ammonium acryloyldimethyl taurate / vinyl pyrrolidone copolymer.

[0018] The above polymer can be 0.05 to 1.0 wt%, 0.05 to 0.5 wt%, 0.05 to 0.3 wt%, or 0.05 to 0.1 wt% based on the total weight of the cosmetic composition. When the above polymer is included in less than 0.05 wt% or more than 1.0 wt%, emulsion stability can be decreased.

[0019] As described above, the oil-in-water cosmetic composition including the emulsifier and the polymer repel each other when exposed to water, and thus the contact angle formed at the interface of the above cosmetic composition and water increases, and thus a high contact angle means that water resistance increases.

[0020] According to an embodiment of the present application, the contact angle formed by the above cosmetic composition and water or a water droplet can be 20 to 30°, 22 to 30°, 24 to 30°, or 26 to 30°.

[0021] When the contact angle formed by the above cosmetic composition and a water droplet is 20 to 30°, the staying power of the cosmetic composition is improved and is not easily removed by water and sweat.

[0022] The cosmetic composition according to the present application can contain, in addition to the emulsifier and the polymer, any component contained in general cosmetics, i.e., a lower alcohol, and an aqueous component other than the above-described components, an oily component other than the above-described components, a powder, a water-soluble polymer, a film-forming agent, a surfactant, a lipid-soluble gelation agent, an organically modified clay mineral, a resin, a coloring agent, an ultraviolet absorber, an ultraviolet scattering agent, a preservative, an antibacterial agent, a perfume, an antioxidant, a pH adjustor, a chelating agent, a cosmetic component, etc., without interfering with the effects of the present application.

[0023] In addition, the cosmetic composition of the present application can be applied in various forms by being used in combination with other components. Specifically, it can be manufactured in various forms such as a liquid type, a gel type, a paste type, a cream type, a solid type, etc. For example, skin care cosmetics such as a toner, an emulsion, a cream, a beauty serum, a massage material, a pack material, a hand cream, a body emulsion, a body cream, an ultraviolet blocking agent, etc.; makeup cosmetics such as a BB cream, a BB emulsion, a BB cream, a foundation, a sunscreen, an eye shadow, an eyeliner, a mascara, an eyebrow pencil, a concealer, a lipstick, a lip balm, etc.; hair care cosmetics such as a hair care spray, a hair conditioner, a hair cream, etc. can be exemplified. The method of use thereof can be exemplified by a method of using by hand or a finger, a method of using by impregnating in a nonwoven fabric, etc.

[0024] According to an embodiment of the present application, the above oil-in-water cosmetic composition can be one or more selected from the group consisting of an ultraviolet blocking agent, a BB cream, a BB emulsion, a BB cream, a foundation, and a sunblock cream.

[0025] The oil-in-water cosmetic composition according to the present application is endowed with water resistance by including an emulsifier and a polymer, thereby increasing the contact angle with water, and as a result, has high durability not easily removed by water or sweat, together with the excellent use feeling unique to oil-in-water. DETAILED DESCRIPTION

[0026] Hereinafter, the present application will be described in more detail. However, such description is only illustratively suggested to help understanding of the present application, and the scope of the present application is not limited to such illustrative description.

[0027] Example 1. Oil-in-water cosmetic composition

[0028] An oil-in-water cosmetic composition having the composition (unit: wt%) of Table 1 below was manufactured as follows.

[0029] First, the A phase and the D phase were measured together and put into an oil phase dissolving tank, and the temperature of the dissolving tank was raised to 70 to 80°C. Next, after the C phase was put in, an Agi mixer (POONG LIM, PL-SS41D) was used to disperse at 500 to 1000 rpm for 30 minutes, thereby preparing an oil phase portion. The E phase and the F phase were measured separately and put into a vacuum emulsifying tank, and after the temperature of the emulsifying tank was raised to 70 to 80°C, stirring (500 to 1000 rpm, 30 minutes) and dissolution were performed, thereby preparing a water phase portion. The prepared oil phase portion was slowly put into the water phase portion in the vacuum emulsifying tank, and a HOMO mixer (PRIMIX Corporation, M2-2.5) was used to emulsify at 1500 to 3500 rpm for 3 minutes. After the emulsification was completed, cooling was performed to 25 to 30°C, and then bubbles were removed, thereby manufacturing the cosmetic compositions of Manufacturing Examples 1 to 18.

[0030] [Table 1]

[0031]

[0032] Example 2. Oil-in-water cosmetic composition

[0033] An oil-in-water cosmetic composition having the composition (unit: wt%) of Tables 2 and 3 below was manufactured as follows.

[0034] First, A phase and D phase were measured together and then introduced into an oil phase dissolving tank, and the temperature of the dissolving tank was raised to 70 to 80°C. Next, after introducing C phase, an Agi-mixer (POONG LIM, PL-SS41D) was used to disperse at 500 to 1000 rpm for 30 minutes, thereby preparing an oil phase portion. E phase and F phase were measured separately and introduced into a vacuum emulsifying tank, and after raising the temperature of the emulsifying tank to 70 to 80°C, stirring (500 to 1000 rpm, 30 minutes) and dissolving were performed, thereby preparing a water phase portion. The prepared oil phase portion was slowly introduced into the water phase portion in the vacuum emulsifying tank, and a HOMO mixer (PRIMIX Corporation, M2-2.5) was used to emulsify at 1500 to 3500 rpm for 3 minutes. Then, using the HOMO mixer, stirring was performed at 1500 to 3500 rpm, and B phase was slowly introduced and dispersed so as not to coagulate. After dispersion, cooling was performed to 25 to 30°C, and bubbles were removed, thereby manufacturing the cosmetic compositions of Production Examples 19 to 45.

[0035] [Table 2]

[0036]

[0037] [Table 3]

[0038]

[0039] Experimental Example 1. Contact angle and viscosity measurement

[0040] The contact angle and viscosity of the oil-in-water cosmetic compositions manufactured in Examples 1 and 2 were measured.

[0041] To measure the contact angle, first, a rubber-made rubber sleeve was fitted on a glass slide, and 0.05 g of each cosmetic composition was uniformly applied. After drying for 20 minutes, purified water was dropped, and the contact angle (unit: °) of the water droplet was measured using a DSA25 (Kruss, Germany).

[0042] Regarding the viscosity, a viscosity measuring instrument (BROOKFIELD, DV1MLVTJ10) was used to measure the viscosity (unit: cP) of each cosmetic composition under the conditions of 90 pin, 30 rpm, and 1 minute.

[0043] The contact angles of the cosmetic compositions of Examples 1 to 45 are shown in Tables 4 to 6 below.

[0044] [Table 4]

[0045]

[0046] As shown in Table 4 above, as the emulsifier content decreases, the contact angle increases due to chemical incompatibility, since the cosmetic composition and the liquid (purified water) are different components from each other, and thus repel each other, increasing the contact angle. At this time, it was found that, when water is used as the liquid, the water resistance of the cosmetic composition increases by increasing the contact angle.

[0047] On the other hand, although a tendency that the contact angle increases as the emulsifier content decreases was shown, the contact angle did not further increase when the emulsifier was 0.03% by weight (Production Examples 1, 6 and 11).

[0048] When the emulsifier was 0.05% by weight (Production Examples 2, 7 and 12), the contact angle was the highest, and thus it was confirmed that the combination of two emulsifiers in a ratio of 1:1 (Production Examples 16 to 18) had a higher contact angle than when one emulsifier was used.

[0049] However, the cosmetic compositions of Production Examples 1 to 18 had a low viscosity in general, and a meaningful viscosity could not be measured, and all of them were separated the next day after production. In order to improve the stability of the cosmetic composition, a polymer was added.

[0050] [Table 5]

[0051]

[0052] As shown in Table 5 above, when acryloyldimethyltaurinate / vinylpyrrolidone copolymer was used as the polymer (Production Examples 19 to 23), a tendency that the contact angle increases as the polymer content increases was shown, the viscosity was improved in general, and the stability was improved.

[0053] In particular, when two emulsifiers were combined in a ratio of 1:1 and used (Production Examples 29 to 33), the contact angle was increased compared to when one emulsifier was used (Production Examples 19 to 28).

[0054] [Table 6]

[0055]

[0056] In addition, as shown in Table 6 above, when acrylate / C10-30 alkyl acrylate crosspolymer (Production Examples 34 to 38) or carbomer (Production Examples 39 to 43) was used as the polymer, the contact angle was lower compared to when acryloyldimethyltaurinate / vinylpyrrolidone copolymer was used (Production Examples 29 to 33 of Table 5), but such a result suggests that acryloyldimethyltaurinate / vinylpyrrolidone copolymer is suitable as the polymer in the oil-in-water cosmetic composition of the present application.

[0057] On the other hand, even when acryloyl dimethyl ammonium glycolate / vinyl pyrrolidone copolymer was used as the polymer and the total amount of the emulsifier was 2 and 4 wt% (Production Examples 44 and 45), a relatively reduced contact angle was shown. Therefore, the emulsifier in the oil-in-water cosmetic composition of the present application is preferably 0.05 to 1.0 wt%.

[0058] Experimental Example 2. In-vitro water resistance evaluation

[0059] The water resistance of the oil-in-water cosmetic compositions of Production Examples 32, 44 and 45 was evaluated.

[0060] Specifically, after 28.6 mg of each cosmetic composition was accurately taken, it was applied to a PMMA plate (Solar light, USA) and dried at room temperature for 20 minutes. A blank plate was first placed in an SPF-290AS (Solar light, USA) and the reference of the ultraviolet blocking coefficient SPF and PA was measured. Then, the PMMA plate on which the cosmetic composition was applied was measured once, and the above PMMA plate was immersed in water at about 25°C for 20 minutes and dried for 20 minutes, and the process was repeated twice, and the second measurement was performed in the SPF-290AS. The SPF and PA of 9 PMMA plates were measured for each sample, and the average value was calculated, and the results are shown in Table 7 below.

[0061]

Table 7

[0062]

[0063] As shown in Table 7 above, it was confirmed that the SPF of the cosmetic compositions of Production Examples 44 and 45 after immersion in water was maintained at about 23.3% and about 17.8%, respectively, and in contrast, the SPF of the cosmetic composition of Production Example 32 after immersion in water was maintained at about 88.9% or more. Therefore, it was known that the oil-in-water cosmetic composition according to the present application has excellent water resistance by containing 0.05 to 0.2 wt% of an emulsifier and 0.05 to 1.0 wt% of a polymer.

[0064] So far, the present application has been described around the preferred embodiments thereof. It will be understood by those skilled in the art to which the present application pertains that the present application can be implemented in modified forms without departing from the essential characteristics of the present application. Therefore, the disclosed embodiments should be considered in the light of illustrative rather than limiting. The scope of the present application is shown in the claims rather than the above description, and all differences within the equivalent scope thereof should be construed as included in the present application.

Claims

1. An oil-in-water cosmetic composition comprising 0.05 to 0.2 wt% of an emulsifier and 0.05 to 1.0 wt% of a polymer.

2. The cosmetic composition according to claim 1, wherein, The emulsifier comprises one or more selected from the group consisting of cetearyl olivate (50) / sorbitan olivate (50), polysorbate 60, cetearyl olivate, sorbitan olivate, glyceryl stearate SE, polyglyceryl-3 distearate, and glyceryl stearate citrate.

3. The cosmetic composition according to claim 1, wherein, The polymer comprises one or more selected from the group consisting of acrylates / C10-30 alkyl acrylate crosspolymer, ammonium acryloyldimethyltaurate / vinylpyrrolidone copolymer, carbomer, sodium polyacrylate, hydroxyethyl acrylate / sodium acryloyldimethyltaurate copolymer, sodium polyacryloyldimethyl taurate, and ammonium acryloyldimethyltaurate / beheneth-25 methacrylate crosspolymer.

4. The cosmetic composition according to claim 1, wherein, The contact angle of the cosmetic composition with water droplets is 20 to 30°.

5. The cosmetic composition according to claim 1, wherein The oil-in-water cosmetic composition is one or more selected from the group consisting of an ultraviolet blocking agent, a tinted base, a tinted emulsion, a BB cream, a foundation, and a sunscreen.

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