UV-blocking cosmetic composition having excellent skin adhesion

Abstract

The present invention relates to a UV-blocking cosmetic composition having excellent skin adhesion and, more specifically, to a UV-blocking cosmetic composition in which an amphiphilic thickener is included to increase the dispersibility and skin adhesion of a UV-blocking agent, and which mitigates the stickiness generated by a water-soluble and water-dispersible organic UV-blocking agent.

Description

UV protection cosmetic composition with excellent skin adhesion

[0001] The present invention relates to a cosmetic composition for sunscreen with excellent skin adhesion, comprising an amphiphilic thickener to enhance the dispersibility and skin adhesion of the sunscreen, and to a cosmetic composition for sunscreen that improves stickiness caused by water-soluble organic sunscreens and water-dispersible organic sunscreens.

[0002]

[0003] The UV protection ability of sunscreen is affected by how well it adheres to the skin when applied. If the application is uneven, it can lead to negative effects such as transfer or stickiness.

[0004] In the case of formulations containing oil-soluble organic sunscreens, an excessive amount of sunscreen is required to achieve high sunscreen protection. When an emulsion formulation is applied to the skin, pores are created by the aqueous phase, and the sunscreen's sunscreen protection ability decreases due to these pores. Therefore, there is a problem in that sunscreens in O / W emulsion formulations, which have excellent texture, cannot provide sufficient protection even if they contain an excessive amount of oil-soluble organic sunscreen.

[0005] To address this, methods involving the use of water-soluble or water-dispersible organic sunscreens to reduce pores and enhance UV protection are known, but this presents a problem of a sticky sensation.

[0006] Against this backdrop, the inventors have made diligent efforts to improve spreadability and usability, and have completed the present invention by confirming the effect of applying an amphiphilic thickener to enhance the dispersibility and skin adhesion of the sunscreen and to improve the stickiness caused by water-soluble organic sunscreens or water-dispersible organic sunscreens.

[0007]

[0008] The present invention comprises an oil phase containing a useful organic UV blocker; and

[0009] The present invention aims to provide a cosmetic composition for sun protection comprising an aqueous phase containing an amphiphilic thickener and a sunscreen agent.

[0010]

[0011] This is explained in detail as follows. Meanwhile, each description and embodiment disclosed in the present invention may be applied to each other description and embodiment. That is, all combinations of the various elements disclosed in the present invention fall within the scope of the present invention. Furthermore, the scope of the present invention should not be considered limited by the specific descriptions provided below.

[0012]

[0013] To achieve the above-mentioned purpose, a cosmetic composition for sunscreen is provided, comprising an oil phase containing an oil-soluble organic sunscreen agent; and an aqueous phase containing an amphiphilic thickener and a sunscreen agent.

[0014]

[0015] The UV-blocking cosmetic composition of the present invention utilizes an amphiphilic thickener to enhance the dispersibility and adhesion of the UV-blocker and provides a user experience with improved non-stickiness.

[0016]

[0017] FIG. 1 is a schematic diagram showing the uniformity and barrier film formation of the ultraviolet blocking cosmetic composition of the present invention.

[0018] FIG. 2 is a photograph and schematic diagram showing the uniformity and thickness of the barrier film of Example 3 and Comparative Example 2 of the present invention.

[0019] FIG. 3 is a graph showing the relative dynamic friction coefficients of Examples 1 and 4 and Comparative Examples 2 and 3 of the present invention.

[0020] Figure 4 is a graph showing the change in stickiness over time after absorption of Examples 1 and 4 and Comparative Examples 2 and 3 of the present invention.

[0021]

[0022] The present invention will be described in more detail below.

[0023]

[0024] The term "ultraviolet blocking composition" of the present invention refers to a product or mixture developed to protect the skin from ultraviolet rays, and signifies a function of reducing the amount of ultraviolet rays reaching the skin by absorbing or reflecting ultraviolet rays. The ultraviolet blocking composition of the present invention may include an amphiphilic thickener, an oil-soluble organic ultraviolet blocker, and a water-soluble organic ultraviolet blocker.

[0025] As described above, formulations containing organic sunscreens require an excess amount of sunscreen to achieve high UV protection.

[0026] However, sunscreens with an excellent feel in O / W emulsion formulations have a problem in that they cannot provide sufficient protection due to the formation of pores, even if they contain an excessive amount of oil-soluble organic sunscreens. Additionally, while including water-soluble organic sunscreens or water-dispersible organic sunscreens to solve the pore formation problem can increase UV protection, it has the disadvantage of a sticky feel.

[0027] Accordingly, the present invention aims to resolve the above problems by using an amphiphilic thickener together with an oil-soluble organic sunscreen and a water-soluble organic sunscreen or a water-dispersible organic sunscreen to improve adhesion and stickiness.

[0028]

[0029] The cosmetic composition for UV protection of the present invention comprises an oil phase containing an oil-soluble organic UV blocker; and

[0030] It includes an aqueous solution containing an amphiphilic thickener and a UV blocker.

[0031] In the present invention, the "oil-soluble organic sunscreen" may have a balanced UVA and UVB blocking effect, possess oil-soluble properties, remain on the skin for a longer period of time, have excellent water resistance, and form a UV-blocking film to block external stimuli.

[0032] The above-mentioned useful organic sunscreen may be included in an amount of 5 to 20 weight%, 8 to 17 weight%, or 10 to 15 weight% relative to the total composition.

[0033] The above-mentioned useful organic sunscreen may provide sufficient UV protection while improving user comfort when used within the above content range.

[0034] The above-mentioned useful organic sunscreen may comprise one or more selected from the group consisting of ethylhexyl methoxycinnamate, ethylhexyl salicylate, octocrylene, isoamyl p-methoxycinnamate, polysilicon-15, homosalate, butyl methoxydibenzoyl methane, diethylaminohydroxybenzoylhexyl benzoate, ethylhexyl triazone, diethylhexyl butamidotriazone, bis-ethylhexyloxyphenol methoxyphenyl triazine, and drometrizole trisiloxane, but is not limited thereto.

[0035] In the present invention, the "amphiphilic thickener" may bind well to both water-soluble and oil-soluble components, help to uniformly mix water and oil components, have moisture-retaining properties to reduce moisture evaporation from the skin and aid in moisturization, and increase skin affinity to allow for a thin and uniform coating, thereby providing adhesion and spreadability. Specifically, the amphiphilic thickener of the present invention may include the thickener disclosed in Korean Application No. 10-2023-0168298.

[0036] The above amphiphilic thickener may comprise a cross-linked polymer formed by polymerizing a water-soluble monomer and a cross-linkable monomer with a silicon-containing monomer represented by the following chemical formula 2.

[0037]

[0038] [Chemical Formula 2]

[0039]

[0040] In the above formula,

[0041] m is an integer from 1 to 5, and

[0042] n is an integer from 10 to 5000, and

[0043] R1 is hydrogen or a C1-3 alkyl group, and

[0044] R2 is a hydroxyl group, a C1-3 alkyl group, or a vinyl group.

[0045]

[0046] The above water-soluble monomer may include at least one selected from the group consisting of acrylamidomethylpropanesulfonic acid (AMPS), acrylic acid, acrylamide, and polyethylene glycol acrylate.

[0047] The content of the above-mentioned water-soluble monomer is not particularly limited, but, for example, it may be included in an amount of 10 to 99 weight% relative to 100 weight% of the total sum of the water-soluble monomer, the crosslinkable monomer, and the silicon-containing monomer represented by Formula 2, preferably in an amount of 30 to 95 weight%, and more preferably in an amount of 50 to 95 weight%. Within the above range, the stability of the composition may be more stabilized and the stickiness improvement effect may be superior.

[0048] The above-mentioned crosslinkable monomer may be a compound having two or more acrylate groups, two or more acrylamide groups, or two or more vinyl groups.

[0049] As such crosslinkable monomers, one or more selected from the group consisting of trimethylolpropane ethoxylate triacrylate (TMPETA), trimethylolpropane triacrylate (TMPTA), methylenebisacrylamide, divinylsulfone, divinylbenzene, divinyl ether, divinylacetylene, polyglycol diacrylate, polyglycol triacrylate, and 4-arm-polyglycol tetraacrylate may be used.

[0050] The content of the crosslinkable monomer is not particularly limited, but for example, the content of the crosslinkable monomer may be included in an amount of 0.01 to 20 weight% with respect to 100 weight% of the total sum of the water-soluble monomer, the crosslinkable monomer, and the silicon-containing monomer represented by Formula 2, preferably in an amount of 0.1 to 10 weight%, and more preferably in an amount of 0.5 to 5.0 weight%. Within the above range, the stability of the composition may be superior or the stickiness improvement effect may be superior.

[0051] The content of the silicon-containing monomer represented by Formula 2 above is not particularly limited, but, for example, may be included in an amount of 1 to 70 weight% relative to 100 weight% of the total sum of the water-soluble monomer, the crosslinkable monomer, and the silicon-containing monomer represented by Formula 2, preferably 5 to 60 weight%, and more preferably 10 to 50 weight%. Within the above range, the stability of the composition may be superior or the stickiness improvement effect may be superior.

[0052] In the present invention, an amphiphilic thickener can be prepared through the steps of: preparing an aqueous-in-water type emulsion composition comprising an aqueous phase comprising a water-soluble monomer and a crosslinkable monomer, and an oil phase comprising a silicon-containing monomer represented by the following chemical formula 2 and a non-polar organic solvent; preparing a reverse-phase emulsion composition in water in oil by heating to 60°C or higher; and preparing a crosslinked polymer by adding a reaction initiator and carrying out a polymerization reaction.

[0053] The solvent of the upper phase may be water (distilled water). In addition, the non-polar organic solvent may be a C6-17 hydrocarbon oil, and may be a C6-17 straight-chain saturated hydrocarbon oil.

[0054] In the present invention, the crosslinked polymer is formed in a core-shell structure. The water-soluble monomer and the crosslinkable monomer may form the core, and the silicon-containing monomer represented by Formula 2 may form the shell. Specifically, the core comprises a crosslinked polymer formed by polymerizing the water-soluble monomer and the crosslinkable monomer, and the shell may comprise a crosslinked polymer formed by polymerizing the silicon-containing monomer represented by Formula 2.

[0055] The above amphiphilic thickener may be included in an amount of 0.0001 to 10 wt%, 0.01 to 5 wt%, 0.03 to 5 wt%, 0.05 to 5 wt%, 0.1 to 5 wt%, 0.01 to 3 wt%, 0.03 to 3 wt%, 0.05 to 3 wt%, 0.1 to 3 wt%, 0.01 to 1 wt%, 0.03 to 1 wt%, 0.05 to 1 wt%, 0.1 to 1 wt%, 0.01 to 0.5 wt%, 0.03 to 0.5 wt%, 0.05 to 0.5 wt%, and 0.1 to 0.5 wt% relative to the total composition.

[0056] If the content of the above amphiphilic thickener is less than 0.0001 weight% relative to the total composition, the effect of improving adhesion may be negligible, and if it is included in excess of 10 weight%, the feeling of use may become stuffy and heavy.

[0057] The above-mentioned water-soluble sunscreen may include one or more of a water-soluble organic sunscreen or a water-dispersible organic sunscreen.

[0058] In the present invention, the "water-soluble organic sunscreen" absorbs ultraviolet rays to prevent the skin from becoming red, has a water-soluble property that gives a light feeling to the skin, and has excellent compatibility with water, generally providing a moisturizing and refreshing feel, and may be rapidly absorbed into the skin.

[0059] The above-mentioned water-soluble organic sunscreen may include one or more selected from the group consisting of para-aminobenzoic acid, benzophenone, terephthalilylidendicampersulfonic acid, and phenylbenzimidazolesulfonic acid, but is not limited thereto.

[0060] In the present invention, the “water-dispersible organic sunscreen” has the characteristic of reducing pores upon application and simultaneously absorbing and scattering ultraviolet rays to boost the UV blocking effect, thanks to its property of dispersing well in water.

[0061] Specifically, the water-dispersible organic sunscreen of the present invention may be a particulate organic sunscreen that is dispersed in water as a water-dispersible organic sunscreen itself, rather than a mixture in which an oil-soluble organic sunscreen is water-oxidized.

[0062] The above water-dispersible organic sunscreen may include one or more selected from the group consisting of methylenebis-benzotriazolyltetramethylbutylphenol (MBBT) and tris-biphenyltriazine (TBPT), but is not limited thereto.

[0063] The above water-soluble organic sunscreen or water-dispersible organic sunscreen may be included in an amount of 0.1 to 15 weight%, 0.1 to 12 weight%, 0.1 to 10 weight%, 0.5 to 15 weight%, 0.5 to 12 weight%, 0.5 to 10 weight%, 1 to 15 weight%, 1 to 12 weight%, and 1 to 10 weight% relative to the total composition.

[0064] If the content of the above water-soluble organic sunscreen or water-dispersible organic sunscreen is less than 0.1 weight% relative to the total composition, it cannot provide sufficient UV protection, and if it exceeds 10 weight%, it may cause a sticky sensation and irritation.

[0065] The above-mentioned aqueous solution may further contain polyalcohols.

[0066] In the present invention, the “polyhydric alcohol” may have the property of retaining moisture and moisturizing the skin, thereby providing a moisturizing effect, and may improve spreadability and help to distribute evenly on the skin by increasing viscosity and adhesion. Additionally, it may improve the stability of the emulsion by increasing the compatibility between water and oil components through amphiphilic properties.

[0067] Specifically, the polyhydric alcohol may have an IOB value of 1 to 5.

[0068] In the present invention, “IOB value” is interpreted as Hydroxyl Balance Index or Hydroxyl Number and means an indicator representing the amount or activity of hydroxyl groups possessed by a polyhydric alcohol molecule.

[0069] The higher the IOB value, the higher the affinity with water, and the more likely it is to act as a catalyst or reactant in various chemical reactions. However, as the IOB value increases, the hydrophilic nature becomes stronger, which can disrupt the balance between the oil and water phases, leading to formulation instability and the possibility of separation, as well as problems such as stickiness of the product and thickening when applied to the skin.

[0070] Polyalcohols with IOB values ​​within the above range provide miscibility with the oil phase, helping to maintain formulation stability and offering spreadability, absorption, and a fresh finish.

[0071] The polyhydric alcohols with an IOB value of 5.0 or less may be one or more selected from the group consisting of, for example, glycerin, sorbitol, xylitol, glucose, trehalose, diglycerin, propanediol, propylene glycol polyglycerin-3, methylpropanediol, butylene glycol, pentylene glycol PEG-6, PEG-8, glycereth-26, dipropylene glycol, 1,2-hexanediol, and caprylyl glycol.

[0072] More preferably, the polyhydric alcohol having an IOB value of 1 to 5 may include glycerin, propanediol, dipropylene glycol, etc., either alone or in combination of two or more, but is not limited thereto.

[0073] The above polyhydric alcohol may be included in an amount of 0.1 to 10 weight%, 0.5 to 8 weight%, or 1 to 5 weight% relative to the total composition.

[0074] If the content of the above polyalcohol is less than 0.1 weight% relative to the total composition, the moisturizing effect and skin adhesion may decrease, and if it exceeds 10 weight%, the feeling of use may become heavy.

[0075] The above-mentioned cosmetic composition for UV protection may further include an anionic emulsifier.

[0076] The above-mentioned anionic emulsifier is bipolar, which helps to stably mix oil and water components, thereby preventing the emulsion from separating and maintaining stability for a long time. Additionally, it may form a protective barrier on the skin and allow UV-blocking ingredients to remain evenly distributed, thereby increasing the UV-blocking effect, and may lighten the stability and texture of the cosmetic composition formulation, providing a non-sticky and refreshing feel.

[0077] The above anionic emulsifier may include potassium cetyl phosphate, sodium lauryl sulfate, sodium C14-16 olefin sulfonate, sodium stearoyl glutamate, or sodium cocoyl glycinate, either alone or in combination of two or more, but is not limited thereto.

[0078] The cosmetic composition (cosmetic) of the present invention comprises all types of ingredients usable in cosmetics, for example, moisturizers such as glycerin, butylene glycol, propylene glycol, hexanediol, methylgluceth-20, diglycerin, and ethylhexylglycerin; sunscreens such as ethylhexyl methoxycinnamate, ethylhexyl salicylate, ethylhexyl triazone, octocrylene, and bis-ethylhexyloxyphenol methoxyphenyl triazine; pH adjusters such as triethanolamine; thickeners such as carbomer, xanthan gum, acrylate / C10-30 alkyl acrylate crosspolymer, and hyaluronic acid; preservatives such as phenoxyethanol, methylparaben, and propyl paraben; antioxidants such as BHT, ethyl ascorbyl ether, and ascorbic acid; and skin conditioning agents such as beta-glucan. Surfactants such as cetearyl glucoside and sorbitan stearate; may additionally include fragrances or colorants, but are not limited to the ingredients.

[0079] Each of the above-mentioned ingredients included in the cosmetic according to the present invention may preferably be included in the cosmetic composition of the present invention within a range that does not exceed the maximum usage amount prescribed in the "Cosmetic Safety and Technical Standards" established by each government.

[0080] The cosmetic product according to the present invention may be manufactured in any formulation conventionally produced in the art. For example, it may have the sun spray, sun essence, sun stick, or sun cream formulations, but is not limited thereto.

[0081] The cosmetic product of the present invention can be used according to a conventional method of use, and the frequency of use may be varied depending on the user's skin condition or preference.

[0082]

[0083] In a specific embodiment, it was confirmed that the UV-blocking cosmetic composition of the present invention is applied uniformly and thinly on the skin, providing high adhesion and an improved effect of usability and non-stickiness.

[0084]

[0085] The advantages and features of the present invention and the methods for achieving them will become clear by referring to the experimental and manufacturing examples described in detail below. However, the present invention is not limited to the experimental and manufacturing examples disclosed below, but may be implemented in various different forms, and is provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention.

[0086]

[0087] The present invention will be explained in more detail below through examples. These examples are intended to explain the invention more specifically, and the scope of the invention is not limited by these examples.

[0088]

[0089] Preparation Example 1: Preparation of an amphiphilic thickener

[0090] The amphiphilic thickener prepared in Example 2 of Korean Application No. 10-2023-0168298 was used.

[0091] Specifically, the amphiphilic thickener was prepared as follows.

[0092] Aqueous: 17g of acrylamidomethylpropanesulfonic acid and 0.5g of trimethylolpropane ethoxylate triacrylate were dissolved in 63g of distilled water, and then neutralized to pH 7-9 with ammonia water.

[0093] Oil phase: 3.4g of silicon methacrylate (molecular weight: 1,000) was added to 80g of heptane, and 10g each of polyoxyethylene (3) oleyl ether and polyoxyethylene (6) oleyl ether were added and mixed well.

[0094] The aqueous phase and the oil phase were placed in a reactor and heated to 70°C, then 0.1g of the initiator 4,4′-Azobis(4-cyanovaleric acid) was added and reacted for 3 hours, the thickener was precipitated with acetone, and the product was dried to obtain the result.

[0095]

[0096] Preparation Example 2: Preparation of a UV-blocking cosmetic composition

[0097] The cosmetic compositions for UV protection of Examples 1 to 4 and Comparative Examples 1 to 5 were prepared based on the compositions of Tables 1 and 2 below.

[0098]

[0099] Experimental Example 1: Measurement of Thickness and Uniformity of UV-blocking Cosmetic Composition

[0100] The thickness and uniformity of the barrier film formed when the UV-blocking cosmetic compositions of Examples 1 to 4 and Comparative Examples 1 to 5 were applied were measured.

[0101] Specifically, aqueous phase A was dispersed and dissolved, then heated to 75°C, and the oil phase was heated to 75°C to dissolve it. Then, aqueous phase A and the oil phase were mixed and emulsified for 20 minutes. Subsequently, the mixture was cooled to 50°C, aqueous phase B was added and mixed homogeneously, and then cooled to 30°C and degassed to prepare a sunscreen cosmetic composition.

[0102] The method for measuring the barrier thickness is 1.3 mg / cm² of each manufactured composition. 2The coating was applied to a PMMA plate (HD6, WENEOS, France) and dried in a dark place for 15 minutes. The thickness was observed by measuring and comparing the surface before and after application using a 3D laser microscope (VK-X3000, Keyence, Japan).

[0103] Since uniformity indicates the degree of uniformity based on the standard deviation of the measured thickness, uniformity was defined as shown in the formula below, and it was confirmed that a larger number indicates greater uniformity.

[0104]

[0105] Uniformity = 100 / Standard Deviation

[0106]

[0107] The thickness and uniformity of the barrier film are shown in Table 3.

[0108]

[0109] Ingredient Name Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Aqueous Part A Purified Water to 100 to 100 to 100 to 100 to 100 Tromethamine Appropriate Amount Appropriate Amount Appropriate Amount Appropriate Amount Terephthalylidene Dicampersulfonic Acid 22222 Phenylbenzimidazole Sulfonic Acid 22222 Potassium Cetyl Phosphate 11111 Xanthan Gum 0.10.10.10.10.1 Carbomer 0.3 Sodium Polyacrylate 0.3 Polyacrylate Crosspolymer-60.3 Ammonium Acryloyl Dimethyl Taurate / VP Copolymer 0.3 Acrylate / C10-30 Alkyl Acrylate Crosspoly 0.3 Amphiphilic Thickener (Preparation Example 1) Glycerin, Propanediol, Dipropylene Glycol, Oil Phase, Butylhexyl Salicylate 4.5, 4.5, 4.5, 4.5, 4.5, 4.5, Isoamyl p-Methoxycinnamate 4.5, 4.5, 4.5, 4.5, 4.5, 4.5, 4.5, Drometrizole Trisiloxane 2.2, 3.2, 2.2, 3.2, 2.2, 3.2, 3.2, 3.2, Diethylamino Hydroxybenzoyl Hexyl Benzoate 1.5, 1.5, 1.5, 1.5, 1.5, 1.5, 1.5, 5.5, Aqueous Phase B, Modified Alcohol 5.5, 5.5, 5.5, Methylene Bis-Benzotriazolyl Tetramethylbutylphenol 1.5, 1.5, 1.5, 1.5, 1.5, 1.5, 5.5, Total 100, 100, 100, 100, 100

[0110]

[0111] Ingredient Name Example 1 Example 2 Example 3 Example 4 Aqueous Phase A Purified Water to 100 to 100 to 100 to 100 Tromethamine Appropriate Amount Appropriate Amount Appropriate Amount Terephthalylidene Dicampersulfonic Acid 2222 Phenylbenzimidazole Sulfonic Acid 2222 Potassium Cetyl Phosphate 1111 Xanthan Gum 0.10.10.10.1 Carbomer Sodium Polyacrylate Polyacrylate Crosspolymer-6 Ammonium Acryloyl Dimethyl Taurate / VP Copolymer Acrylate / C10-30 Alkyl Acrylate Crosspoly Amphiphilic Thickener (Preparation Example 1) 0.30.30.30.3 Glycerin 3 Propanediol 3 Dipropylene Glycol 3 Oil phase Butylhexyl Salicylate 4.5 4.5 4.5 4.5 Isoamyl p-Methoxycinnamate 4.5 4.5 4.5 4.5 Drometrizole Trisiloxane 2.2 3 2.2 3 2.2 3 2.2 3 Diethylaminohydroxybenzoylhexyl benzoate 1.5 1.5 1.5 1.5 Aqueous phase B Modified Alcohol 5 5 5 5 Methylenebis-Benzotriazolyl Tetramethylbutylphenol 1.5 1.5 1.5 1.5 Total 100 100 100 100

[0112]

[0113] Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Example 1 Example 2 Example 3 Example 4 Barrier film thickness (㎛) - 9.7 29.5 28.6 07.9 35.7 84.9 34.9 23.52 Uniformity - 29.3 844.5 037.5 932.4 846.5 947.1 551.5 588.81

[0114] In the case of Comparative Example 1, it was impossible to measure thickness and uniformity due to layer separation.

[0115]

[0116] As shown in Table 3 and Figure 2, when checking the thickness and uniformity of the barrier films of Examples 1 to 4 and Comparative Examples 1 to 5 prepared with the composition of Table 1 or Table 2, it was confirmed that Examples 1 to 4 were applied more uniformly than Comparative Examples 1 to 5, resulting in a higher UV blocking effect, and were also applied thinly.

[0117] Accordingly, it was confirmed that the cosmetic composition for UV protection of the present invention provides a cosmetic composition for UV protection that is applied thinly and uniformly to the skin and has excellent adhesion by using a water-soluble organic UV blocker, a water-dispersible organic UV blocker, and an amphiphilic thickener.

[0118]

[0119] Experimental Example 2: Stickiness Analysis by Relative Dynamic Friction Coefficient

[0120] Leather with characteristics similar to skin was selected, a certain amount of the composition was applied to the leather, and the change in the coefficient of friction over 20 round trips was measured using a dynamic friction coefficient measuring device. In other words, stickiness was analyzed by checking the change in the coefficient of friction from the initial application to absorption.

[0121] Specifically, the coefficient of dynamic friction of uncoated leather was measured, and the composition of the comparative example or example was applied to the leather and dried, after which the coefficient of dynamic friction was measured. The measured values ​​were substituted into the following formula to calculate the relative coefficient of dynamic friction, which is shown in FIG. 3.

[0122] Measured dynamic friction coefficient value - Uncoated dynamic friction coefficient = Relative dynamic friction coefficient (the closer to 0, the stickier the state is similar to the uncoated state)

[0123] As shown in Figure 3, it was confirmed that in the case of Comparative Example 2 and Comparative Example 3, compared to Example 1 and Example 4, the rolling count gradually increased.

[0124] Accordingly, in the case of Comparative Examples 2 and 3, the relative kinetic friction coefficient value is higher than 0 as the number of applications increases, whereas Example 1 converges to 0, showing stickiness similar to no application, and in the case of Example 4, a value less than 0 is shown, confirming that the stickiness of the Examples is improved compared to the Comparative Examples.

[0125]

[0126] Experimental Example 3: Analysis of stickiness over time after absorption

[0127] The cosmetic compositions prepared in Examples 1 and 4 and Comparative Examples 2 and 3 were applied to the skin and absorbed, and the stickiness over time was measured.

[0128] Specifically, when the skin was not applied (no application) and when each comparative example and example was applied to the skin and absorbed, the skin was measured using a texture analyzer after a certain period of time, and the relative increase rate (percentage, %) compared to the no application was used as the stickiness value for comparison.

[0129] As shown in FIG. 4, it was confirmed that the UV-blocking cosmetic composition of the present invention prepared in Example 1 and Example 4 provides a fresh feeling of use without stickiness immediately after absorption and without stickiness over time after absorption, compared to Comparative Example 2 and Comparative Example 3.

[0130]

[0131] Experimental Example 4: Evaluation of Usability

[0132] To evaluate the user experience of the sunscreen cosmetic composition of the present invention, spreadability, moisture, stickiness, residue, and satisfaction were evaluated by consumer monitors on 15 women in their 20s to 40s for 3 days and are shown as scores in Table 4 below.

[0133] Specifically, after using Comparative Example 2 and Example 4 on the face for 3 days, subjective satisfaction for each evaluation item was scored as very satisfied 5, satisfied 4, average 3, dissatisfied 2, and very dissatisfied 1.

[0134]

[0135] Spreadability Moisture Permeability Stickiness Residue Overall Satisfaction Example 4 4.8 4.4.9 0 4.7 7 4.7 4.80 Comparative Example 2 4.2 0 4.5 0 3.3 0 3.9 0 3.90

[0136]

[0137] As shown in Table 4 above, Example 4 according to the present invention showed high satisfaction with an average score of 4.8 out of 5 in the evaluation of usability, whereas Comparative Example 2 showed an overall satisfaction score of 3.9, with a significant difference particularly in stickiness. In summary, the experimental examples of the present invention confirmed that the UV-blocking cosmetic composition of the present invention is applied uniformly and thinly on the skin, provides high adhesion, and has improved usability and stickiness.

[0138]

[0139] From the foregoing description, those skilled in the art to which the present invention pertains will understand that the present invention may be implemented in other specific forms without altering its technical concept or essential features. In this regard, the embodiments described above should be understood as illustrative in all respects and not restrictive. The scope of the present invention should be interpreted as including all modifications or variations derived from the meaning and scope of the claims set forth below and their equivalents, rather than from the detailed description above.

Claims

Oil phase containing a useful organic sunscreen; and It comprises an aqueous phase containing an amphiphilic thickener and a UV blocker, and The above-mentioned amphiphilic thickener comprises a crosslinked polymer formed by polymerizing a water-soluble monomer and a crosslinkable monomer with a silicon-containing monomer represented by the following chemical formula 2, and A cosmetic composition for UV protection in which the above-mentioned crosslinked polymer is formed in a core-shell structure: [Chemical Formula 2] In the above formula, m is an integer from 1 to 5, and n is an integer from 10 to 5000, and R1 is hydrogen or a C1-3 alkyl group, and R2 is a hydroxyl group, a C1-3 alkyl group, or a vinyl group. In paragraph 1, The above water-soluble monomer comprises at least one selected from the group consisting of acrylamidomethylpropanesulfonic acid (AMPS), acrylic acid, acrylamide, and polyethylene glycol acrylate. In paragraph 1, A cosmetic composition for UV protection in which the above-mentioned crosslinkable monomer is a compound having two or more acrylate groups, two or more acrylamide groups, or two or more vinyl groups. In paragraph 1, A cosmetic composition for UV protection containing the above-mentioned amphiphilic thickener in an amount of 0.0001 to 10 weight% relative to the total composition. In paragraph 1, A cosmetic composition for sunscreen, wherein the above-mentioned sunscreen comprises one or more of a water-soluble organic sunscreen or a water-dispersible organic sunscreen. In paragraph 5, A cosmetic composition for sunscreen comprising the above-mentioned water-soluble organic sunscreen or water-dispersible organic sunscreen in an amount of 0.1 to 15 weight% relative to the total composition. In paragraph 5, The above water-soluble organic sunscreen is a cosmetic composition for sunscreen comprising one or more selected from the group consisting of para-aminobenzoic acid, benzophenone, terephthalilylidendicampersulfonic acid, and phenylbenzimidazolesulfonic acid. In paragraph 5, The above water-dispersible organic sunscreen is a cosmetic composition for sunscreen comprising one or more selected from the group consisting of methylenebis-benzotriazolyltetramethylbutylphenol (MBBT) and tris-biphenyltriazine (TBPT). In paragraph 1, A cosmetic composition for UV protection that further comprises a polyalcohol in the above aqueous phase. In Paragraph 9, The above polyhydric alcohol is a cosmetic composition for sunscreen having an IOB value of 1 to 5. In Paragraph 9, A cosmetic composition for UV protection comprising the above polyhydric alcohol in an amount of 0.1 to 10 weight% relative to the total composition. In paragraph 1, The above-described cosmetic composition for sunscreen further comprises an anionic emulsifier.

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