Cosmetic composition for blocking ultraviolet rays without clouding

Abstract

The present invention relates to an ultraviolet blocking cosmetic composition which contains a water-soluble organic ultraviolet blocking agent and a water-soluble thickener in an aqueous phase, and an oil-soluble organic ultraviolet blocking agent and an oil thickener in an oil phase, and which prevents coalescence between emulsified particles in an oil-in-water (O / W) formulation, thereby resolving the problem of phase separation due to long-term storage or high-temperature storage and improving phase stability, and which contains only an organic ultraviolet blocking agent, thereby significantly reducing cloudiness, exhibiting a sufficient ultraviolet protection index, and providing a pleasant feel when used.

Description

[Technical field]

[0001] The present invention relates to an ultraviolet blocking cosmetic composition which contains a water-soluble organic ultraviolet blocking agent and a water-soluble thickener in an aqueous phase, and contains an oil-soluble thickener and an oil-soluble organic ultraviolet blocking agent in an oil phase, and which prevents coalescence between emulsified particles in an oil-in-water (O / W) formulation, thereby resolving the problem of phase separation due to long-term storage or high-temperature storage and improving phase stability, and which contains only an organic ultraviolet blocking agent, thereby significantly reducing cloudiness, exhibiting a sufficient ultraviolet protection index, and providing a pleasant feel when used. [Background technology]

[0002] Ultraviolet rays emitted from sunlight are the main cause of skin erythema, edema, freckles, and skin cancer. Accordingly, in recent years, much research into various skin diseases caused by ultraviolet rays has been actively conducted.

[0003] Generally, ultraviolet rays are divided into UV-A, UV-B and UV-C according to their wavelengths, with 320-400nm being UV-A, 280-320nm being UV-B and 200-280nm being UV-C. UV-A is known to penetrate into the dermis of the skin and induce skin cancer, and to promote wrinkles and melanin formation, thereby causing skin aging and skin irritation, while UV-B is known to penetrate into the epidermis of the skin and cause erythema, freckles or edema. UV-C does not reach the earth's surface while passing through the ozone layer and disappears.

[0004] In order to prevent or improve the above-mentioned sun exposure-related skin diseases, consumers are increasingly interested in UV blocking products. As a result, UV blocking products with various types of sun protection factors (SPF) are now on the market. In general, UV blocking products contain inorganic UV blocking agents such as titanium dioxide or zinc oxide, or organic UV blocking agents such as ethylhexyl methoxycinnamate, ethylhexyl salicylate, octocrylene, ethylhexyl triazone, bis-ethylhexyloxyphenol methoxyphenyl triazine, or diethylamino hydroxybenzoyl hexyl benzoate, in order to show high SPF values.

[0005] Among these, cosmetics containing inorganic UV blocking agents have the disadvantage of causing opacity when applied to the skin. Therefore, various technologies that contain only organic UV blocking agents have been developed in the past. Organic UV blocking agents are further classified into water-soluble organic UV blocking agents (water-soluble organic UV blocking agents) and oil-soluble organic UV blocking agents (oil-soluble organic UV blocking agents), and various technologies related to UV blocking compositions in O / W or W / O formulations have been known in the past.

[0006] It is known that, from the viewpoint of usability, water-in-oil (W / O) formulations are heavy, whereas oil-in-water (O / W) formulations are light and refreshing. However, UV-blocking cosmetics of oil-in-water (O / W) formulations, which contain an oil-soluble organic UV-blocking agent in the internal phase, which is a discontinuous phase, have the problem that voids occur during application, and the cosmetic is not evenly applied to the skin, resulting in insufficient UV-blocking effect. To solve this problem, when a water-soluble organic UV-blocking agent is contained in the external phase, which is the aqueous phase, the thickener contained in the external phase for emulsion stability is affected by the salt contained in the aqueous phase by the water-soluble organic UV-blocking agent, and its function is reduced, resulting in problems such as reduced emulsion stability and phase separation. Thickeners that cause such problems include thickeners that thicken by extending the random coil shape when neutralized by pH adjustment (alkali agent). Specifically, the backbone of a thickener such as Carbopol, which exists in a random coil form, is neutralized by an alkaline substance in an aqueous solution and becomes extended, forming a thickening system. However, the backbone of the thickener is recoiled again in a random coil form due to salts contained in the aqueous phase, causing the thickening system to collapse, which leads to coalescence of emulsion particles and phase separation, resulting in a decrease in viscosity and hardness.

[0007] Thus, prior art documents such as "UV-blocking cosmetic composition containing a water-soluble thickener to improve emulsion stability and usability (Korean Patent No. 10-1466649)" and "Functional cosmetic composition containing two types of water-soluble thickeners to block UV rays while being cool and refreshing (Korean Patent No. 10-2033473)" are known. However, a composition containing a thickener only in the aqueous phase still has a problem in that voids are easily generated when applied to the skin, resulting in uneven UV-blocking effect. In addition, the interaction between salt and the thickener may cause a decrease in the function of the thickener, resulting in phase separation of the composition, which is undesirable from the viewpoint of safety. In other words, the prior art has limitations in realizing a cosmetic composition that fully exhibits excellent UV-blocking effect while improving usability and stability.

[0008] Therefore, there is a need for a technology that can solve the problem of decreased phase stability due to interaction between salt and thickener in UV blocking cosmetic compositions that are oil-in-water formulations containing a water-soluble UV blocking agent. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Republic of Korea Patent No. 10-1466649 [Patent Document 2] Republic of Korea Patent No. 10-2033473 Summary of the Invention [Problem to be solved by the invention]

[0010] The object of the present invention is to provide a cosmetic composition for blocking ultraviolet rays which is an O / W formulation containing a water-soluble organic ultraviolet ray blocking agent in the water phase, and which has improved phase stability and usability without causing clouding, and which can exhibit sufficient ultraviolet ray blocking effect. [Means for solving the problem]

[0011] As a means for solving the above problems, the present invention provides an ultraviolet blocking cosmetic composition which is an oil-in-water (O / W) formulation and which comprises an aqueous phase containing a water-soluble organic ultraviolet blocking agent and a water-soluble thickener, and an oil phase containing an oil thickener and an oil-soluble ultraviolet blocking agent.

[0012] The cosmetic composition for blocking ultraviolet light according to the present invention will be described in more detail below.

[0013] In the present invention, in order to prevent the clouding phenomenon, the composition of the present invention may contain less than 1%, less than 0.5%, less than 0.1%, or substantially no inorganic UV blocking agent based on the weight of the total composition.

[0014] The prior art discloses "An ultraviolet blocking cosmetic composition containing a water-soluble thickener to improve emulsion stability and usability (Korean Patent No. 10-1466649)" and "An oil-in-water type cosmetic composition in a solid stick formulation containing a water-soluble thickener to block ultraviolet rays while being cool and refreshing (Korean Patent No. 10-2033473)." However, the prior art aims to improve emulsion stability, increase composition hardness, or prevent syneresis by preparing and adding a water-soluble thickener in the form of a water-in-oil type or by using only a water-soluble thickener containing a plant-derived water-soluble thickener, and the improvement in stability was evaluated visually.

[0015] Meanwhile, in one embodiment of the present invention, a cosmetic composition for blocking ultraviolet rays was prepared, and it was confirmed that the cloudiness phenomenon was significantly reduced by containing only an organic ultraviolet ray blocking agent, and that the ultraviolet ray blocking efficiency was excellent even though the visible light transmittance was significantly increased, as analyzed by a colorimeter and a spectrophotometer. In addition, it was confirmed that the inclusion of a thickener in each of the aqueous phase and oil phase improved the uniformity of the emulsion particles, suppressed the Ostwald ripening phenomenon caused by the unevenness of particle size, and delayed the coalescence between particles, and as a result, the phase stability was improved and no separation occurred, and the stability of the formulation was significantly improved.

[0016] In the present invention, the water-soluble organic UV blocking agent may be selected from, but is not limited to, phenylbenzimidazole sulfonic acid or terephthalylidene dicamphor sulfonic acid. The organic UV blocking agent may be any water-soluble organic substance that has been used for UV blocking in the past, without any limitation.

[0017] Although not limited thereto, in a specific embodiment of the present invention, the composition of the present invention may contain, based on the weight of the total composition, 0.01 to 20 parts by weight of a water-soluble organic UV blocking agent, for example, 0.01 to 0.1 parts by weight, 0.01 to 1 parts by weight, 0.01 to 2.5 parts by weight, 0.01 to 5 parts by weight, 0.01 to 10 parts by weight, 0.01 to 15 parts by weight, 0.01 to 20 parts by weight, 0.1 to 1 part by weight, 0.1 to 2.5 parts by weight, 0.1 to 5 parts by weight, 0.1 to 10 parts by weight, 0.1 to 15 parts by weight, 0.1 to 20 parts by weight, 1 to 2.5 parts by weight, or 1 to 5 parts by weight, 1 to 10 parts by weight, 1 to 15 parts by weight, or 1 to 20 parts by weight.

[0018] When the water-soluble organic UV blocking agent according to the present invention is contained in an amount less than 0.01 parts by weight of the total composition, a sufficient UV blocking effect cannot be expected, and when the amount exceeds 20 parts by weight, unwanted reactions such as allergies may occur or problems may arise in terms of skin safety. This is intended to prevent these problems.

[0019] In the present invention, the water-soluble thickener used is a water-soluble thickener having a hydrophobic group.

[0020] The water-soluble thickener having a hydrophobic group is at least one selected from the group consisting of acrylates / C10-30 alkyl acrylate crosspolymer, sodium polyacrylate, sodium polyacryloyldimethyltaurate, sodium acrylate / beheneth-25 methacrylate crosspolymer, sodium acrylate / sodium acryloyldimethyltaurate copolymer, sodium acrylate / acryloyldimethacrylate / dimethylacrylamide crosspolymer, acrylates / beheneth-25 methacrylate copolymer, acrylate copolymer, ammonium acryloyldimethyltaurate / beheneth-25 methacrylate crosspolymer, ammonium acryloyldimethyltaurate / VP copolymer, polyacrylate-13, polyacrylate crosspolymer-6, polyacrylamide, PDI-240 / HDI copolymer bis-decyltetradeceth-20 ether, and hydroxyethyl acrylate / sodium acryloyldimethyltaurate copolymer. Preferably, the use of a water-soluble thickener containing a hydrophobic group can be advantageous to improve the stability of the composition.

[0021] Although not limited thereto, in one specific example of the present invention, the composition of the present invention may contain a water-soluble thickener in an amount of 0.001 to 5 parts by weight, for example, 0.001 to 0.01 parts by weight, 0.001 to 0.1 parts by weight, 0.001 to 1 part by weight, 0.001 to 2.5 parts by weight, 0.001 to 5 parts by weight, 0.01 to 0.1 parts by weight, 0.01 to 1 part by weight, 0.01 to 2.5 parts by weight, 0.01 to 5 parts by weight, 0.1 to 1 part by weight, 0.1 to 2.5 parts by weight, 0.1 to 5 parts by weight, 1 to 2.5 parts by weight, or 1 to 5 parts by weight, based on the weight of the total composition.

[0022] When the water-soluble thickener according to the present invention is contained in an amount of less than 0.001 parts by weight of the total composition, improvement in the phase stability of the composition cannot be expected, and when it is contained in an amount of more than 5 parts by weight, unwanted reactions such as a thick application feeling or allergies may occur, or there may be problems with skin safety, so this is intended to prevent these.

[0023] In the case where salt is included in the aqueous phase in the system for thickening the aqueous phase, the backbone of the thickener, which is neutralized and expanded by an alkaline substance, can be recoiled in random coil, which may hinder the function of the thickener. Therefore, in the present invention, a thickening system is also introduced in the oil phase to complement the thickening system. To thicken the oil phase, an organic oil thickener or an inorganic oil thickener may be selected and included as the oil thickener. In the present invention, the oil thickener is selected from the group consisting of polyamide-8, dextrin palmitate, dextrin palmitate / ethyl hexanoate, stearoyl inulin, polyurethane-79, dibutyl ethylhexanoyl glutamide, dibutyl lauroyl glutamide, poly C10-30 alkyl acrylate ... Acrylate), disteardimonium hectorite, stearalkonium hectorite, quaternium-18 hectorite, dihydrogenated tallow benzilmonium hectorite, quaternium-18 / benzalkonium bentonite, quaternium-18 bentonite, quaternium-90 bentonite stearalkonium bentonite, quaternium-90 montmorillonite, and quaternium-90 sepiolite may be used, but is not limited thereto. The oil thickener may be any oil-soluble substance that has been used for thickening the conventional oil phase without any limitation.

[0024] By including an oil thickener in the internal phase, the emulsion particles can have a uniform size in the range of 0.01 to 30 μm.

[0025] Although not limited thereto, in a specific example of the present invention, the composition of the present invention may contain an oil thickener in an amount of 0.01 to 15 parts by weight, for example, 0.01 to 0.1 parts by weight, 0.01 to 1 parts by weight, 0.01 to 2.5 parts by weight, 0.01 to 5 parts by weight, 0.01 to 10 parts by weight, 0.01 to 15 parts by weight, 0.1 to 1 parts by weight, 0.1 to 2.5 parts by weight, 0.1 to 5 parts by weight, 0.1 to 10 parts by weight, 0.1 to 15 parts by weight, 1 to 2.5 parts by weight, or 1 to 5 parts by weight, 1 to 10 parts by weight, or 1 to 15 parts by weight, based on the weight of the total composition.

[0026] When the oil thickener according to the present invention is contained in an amount of less than 0.01 parts by weight of the total composition, improvement in the phase stability of the composition cannot be expected, and when it is contained in an amount of more than 15 parts by weight, a heavy, unrefreshing, oily feeling upon use or unwanted reactions such as allergies may occur, or there may be a problem with skin safety, and this is to prevent these.

[0027] In the present invention, the oil-soluble organic UV blocking agent may be selected from the group consisting of butyl methoxydibenzoylmethane, diethylamino hydroxybenzoyl hexyl benzoate, ethylhexyl triazone, diethylhexyl butamido triazone, bis-ethylhexyloxyphenol methoxyphenyl triazine, drometrizole trisiloxane, methylene bis-benzotriazolyl tetramethylbutylphenol, and tris-biphenyl triazin, but is not limited thereto. The organic UV blocking agent may be any oil-soluble organic material that has been used for UV blocking in the past, without any limitation.

[0028] Although not limited thereto, in a specific embodiment of the present invention, the composition of the present invention may contain an oil-soluble organic UV blocking agent in an amount of 0.01 to 20 parts by weight, for example, 0.01 to 0.1 parts by weight, 0.01 to 1 parts by weight, 0.01 to 2.5 parts by weight, 0.01 to 5 parts by weight, 0.01 to 10 parts by weight, 0.01 to 15 parts by weight, 0.01 to 20 parts by weight, 0.1 to 1 parts by weight, 0.1 to 2.5 parts by weight, 0.1 to 5 parts by weight, 0.1 to 10 parts by weight, 0.1 to 15 parts by weight, 0.1 to 20 parts by weight, 1 to 2.5 parts by weight, or 1 to 5 parts by weight, 1 to 10 parts by weight, 1 to 15 parts by weight, or 1 to 20 parts by weight, based on the weight of the total composition.

[0029] The oil-soluble organic UV blocking agent according to the present invention is intended to prevent the occurrence of unwanted reactions such as allergies or skin safety problems, since if it is contained in an amount less than 0.01 parts by weight of the total composition, a sufficient UV blocking effect cannot be expected, and if it is contained in an amount exceeding 20 parts by weight, unwanted reactions such as allergies may occur or there may be problems with skin safety.

[0030] The oil-soluble UV blocking agent according to the present invention may preferably be solid at room temperature. A UV blocking agent that is solid at room temperature has the advantage of being superior in UV blocking efficiency to a liquid UV blocking agent.

[0031] In the present invention, the emulsifier preferably contains a polyglyceryl-based emulsifier, and it is preferable that the PEG-based emulsifier is contained in an amount of less than 1%, less than 0.5%, less than 0.1%, or is substantially absent.

[0032] The polyglyceryl-based emulsifier according to the present invention is at least one selected from the group consisting of polyglyceryl-3 methylglucose distearate, polyglyceryl-3 distearate, polyglyceryl-4 caprate, polyglyceryl-6 stearate, polyglyceryl-6 behenate, polyglyceryl-6 dicaprate, and polyglyceryl-6 laurate. Although not limited thereto, in one specific example of the present invention, the composition of the present invention may contain a polyglyceryl-based emulsifier in an amount of 0.01 to 10 parts by weight, for example, 0.01 to 0.1 parts by weight, 0.01 to 1 part by weight, 0.01 to 2.5 parts by weight, 0.01 to 5 parts by weight, 0.01 to 10 parts by weight, 0.1 to 1 part by weight, 0.1 to 2.5 parts by weight, 0.1 to 5 parts by weight, 0.1 to 10 parts by weight, 1 to 2.5 parts by weight, 0.1 to 5 parts by weight, or 1 to 10 parts by weight, based on the weight of the total composition.

[0033] When the polyglyceryl-based emulsifier of the present invention is contained in an amount of less than 0.01 parts by weight of the total composition, the emulsifying function within the composition cannot be expected, and when it is contained in an amount of more than 10 parts by weight, unwanted reactions such as increased hardness, phase separation, and allergies may occur, or there may be problems with skin safety, so this is to prevent these.

[0034] In the present invention, the cosmetic composition may be in the form of a general emulsion preparation and solubilization preparation. For example, it may have the formulation of a milky lotion such as a facial lotion or a body lotion, a cream such as a nutritional cream, a moisture cream, or an eye cream, an essence, a cosmetic ointment, a balm, a spray, a gel, a pack, a sunscreen, a makeup base, a liquid type, a solid type, or a spray type foundation, a powder, or the like.

[0035] Said cosmetic product may also contain, in addition to the composition of the present invention, auxiliaries commonly used in the cosmetic field, such as fatty substances, organic solvents, solubilizers, thickening and gelling agents, emollients, antioxidants, suspending agents, stabilizing agents, foaming agents, fragrances, surfactants, water, ionic or non-ionic emulsifiers, fillers, sequestering and chelating agents, preservatives, vitamins, blocking agents, moisturizing agents, essential oils, dyes, pigments, hydrophilic or lipophilic active agents, lipid sachets or any other ingredient commonly used in cosmetic products.

[0036] In one embodiment, the cosmetic composition may be transparent or translucent. In this case, the composition was coated on a glass plate to a thickness of 3 μm, and then placed on a piece of paper with writing on it to confirm the writing on the other side (Experimental Example 4). If the writing was clearly visible, it was defined as "transparent." If the writing was blurred but readable, it was defined as "semitransparent." If the writing was not visible or could not be read even if it was visible, and its meaning could not be understood, it was defined as "opaque."

[0037] The cosmetic composition of the present invention may be used in a normal manner, and the frequency of use may be varied depending on the skin condition or preference of the user.

[0038] Each of the above-mentioned components contained in the cosmetic composition according to the present invention may be preferably contained in the cosmetic composition according to the present invention within a range not exceeding the maximum usage amount specified in regulations related to "cosmetic use permission" prescribed by the governments of each country.

[0039] The present invention also provides a method for producing a cosmetic composition comprising a water-soluble organic UV blocking agent and a water-soluble thickener in an aqueous phase, and an oil-soluble thickener and an oil-soluble organic UV blocking agent in an oil phase.

[0040] The manufacturing method of the present invention will now be described in detail.

[0041] The production method of the present invention may include a step of producing an aqueous phase containing a water-soluble organic UV blocking agent and a water-soluble thickener, a step of producing an oil phase containing an oil-soluble organic UV blocking agent and an oil thickener, and a step of homogeneously mixing the aqueous phase and the oil phase to produce an ultraviolet blocking cosmetic composition that is an oil-in-water (O / W) formulation.

[0042] The step of preparing the oil phase may further include the step of adding a polyglyceryl-based emulsifier.

[0043] According to the present invention, excellent formulation stability of the oil-in-water composition can be achieved through homogeneous mixing in the step of preparing the cosmetic composition. Effect of the Invention

[0044] The cosmetic composition for blocking ultraviolet rays according to the present invention contains a water-soluble organic ultraviolet ray blocking agent and a water-soluble thickener in the aqueous phase, and contains an oil-soluble thickener and an oil-soluble organic ultraviolet ray blocking agent in the oil phase. Since coalescence between emulsified particles of an oil-in-water (O / W) preparation is prevented, the problem of phase separation due to long-term storage or high-temperature storage is solved, and phase stability is improved. Since the cosmetic composition contains only an organic ultraviolet ray blocking agent, no cloudiness occurs, the composition exhibits a sufficient ultraviolet ray protection index, and has a good feel when used. [Brief description of the drawings]

[0045] FIG. 1 is a photograph showing the stability result of a cosmetic composition for blocking ultraviolet rays according to an embodiment of the present invention after storage at high temperature. FIG. 2 is a micrograph of a cosmetic composition for blocking ultraviolet light according to an embodiment of the present invention immediately after preparation. FIG. 3 is a graph showing the analysis results of a particle size analyzer immediately after the preparation of a cosmetic composition for blocking ultraviolet rays according to an embodiment of the present invention. FIG. 4 is an example diagram illustrating the principle of increased UV blocking efficiency of a cosmetic composition for UV blocking according to an embodiment of the present invention. FIG. 5 is a photograph showing the results of visual evaluation of the opacity of a cosmetic composition for blocking ultraviolet light according to an embodiment of the present invention. FIG. 6 is a graph showing the measurement results of opacity and visible light transmittance of a cosmetic composition for blocking ultraviolet rays according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0046] The present invention will be described in more detail with reference to the following examples. However, the following examples are merely illustrative of the present invention, and the content of the present invention is not limited to the following examples.

[0047] Specific examples of the cosmetic composition for blocking ultraviolet light according to the present invention are given below.

[0048] Experimental Example 1: Confirmation of the stability improvement effect of a cosmetic composition containing a water-soluble thickener having a hydrophobic group, an oil thickener, and a water-soluble UV blocking agent In order to confirm the phase stability of the cosmetic composition containing the water-soluble UV blocker of the present invention, Comparative Examples 1 to 3 and Example 1 were prepared according to the compositions and contents in Table 1 below, and their stability at high temperatures was compared.

[0049] [Table 1]

[0050] Specifically, each composition was evaluated by the following evaluation methods.

[0051] Evaluation 1. Visual evaluation After storing each composition in a constant temperature chamber at 50°C, the phase stability was evaluated visually after 2 weeks and 4 weeks. If no phase separation occurred, the composition was rated as "stable", and if phase separation occurred, the composition was rated as "separated". The results are shown in Table 2, and the appearance of each composition of Comparative Example 1 and Example 1 after storing in a constant temperature chamber at 50°C for 4 weeks is shown in Figure 1.

[0052] [Table 2]

[0053] Among the results, the results of Comparative Example 1 and Comparative Example 2 show that when a water-soluble thickener is not used in combination with an oil thickener, phase separation occurs at high temperatures whether a water-soluble thickener containing a hydrophobic group or a water-soluble thickener not containing a hydrophobic group is used. Also, the results of Comparative Example 3 and Example 1 show that when a water-soluble thickener is used in combination with an oil thickener but not containing a hydrophobic group, separation occurs at high temperatures as in Comparative Example 3.

[0054] Evaluation 2. Evaluation by particle analysis Immediately after preparation of each of the compositions of Comparative Example 1 and Example 1, the size of the emulsion particles was analyzed using a microscope or a particle size analyzer (Mastersizer), and the results are shown in FIGS.

[0055] As a result, when observing the emulsion particles immediately after preparation of Comparative Example 1 and Example 1, it was found that the particle shape of Example 1 was more uniform under a microscope (Figure 2) and the size of the emulsion particles was smaller and the variation in particle size distribution was smaller when measured using a particle size analyzer (Mastersizer) compared to Comparative Example 1 (Figure 3). It was determined that the results shown in Figure 1 were obtained due to such differences in emulsion particle distribution, and it was found that the cosmetic composition of the present invention, which contains a water-soluble thickener containing a hydrophobic group in the aqueous phase and an oil-based thickener in the oil phase, is more stable than conventional cosmetics.

[0056] Experimental Example 2. Confirmation of the stability of compositions containing water-soluble UV blocking agents according to the type of water-soluble thickener containing a hydrophobic group and oil thickener In order to confirm the phase stability of compositions containing a water-soluble UV blocking agent according to the type of water-soluble thickener containing a hydrophobic group and the type of oil thickener, Examples 2 to 12 were prepared with the compositions and contents shown in Tables 3 to 5 below, and their stability at high temperatures was compared.

[0057] Specifically, the prepared compositions were stored in a constant temperature chamber at 50°C, and after 4 weeks, the phase stability was evaluated visually. If no phase separation occurred, the composition was evaluated as "stable," and if phase separation occurred, the composition was evaluated as "separated." The results are shown in Tables 3 to 5.

[0058] [Table 3]

[0059] [Table 4]

[0060] [Table 5]

[0061] The results in Tables 3 to 5 show that compositions containing water-soluble UV blocking agents are similarly stable even when they contain a water-soluble thickener having a different type of hydrophobic group than in Example 1 or a different type of oil thickener.

[0062] Experimental Example 3: Confirmation of the UV blocking efficiency improvement effect of a cosmetic composition containing a water-soluble thickener having a hydrophobic group, an oil thickener, and a water-soluble UV blocking agent In order to confirm whether the cosmetic composition according to the present invention, which is phase stable even when it contains a water-soluble UV blocker, has an increased UV blocking efficiency compared to a cosmetic composition containing only an oil-soluble UV blocker due to its phase stability, Comparative Example 4 and Example 13 were prepared with the compositions and contents shown in Table 6 below, and the UV blocking efficiency of each was confirmed.

[0063] Specifically, each composition was applied to a PMMA plate (HelioScreen Labs, HD6) at 1.3 mg / cm 2 After drying at room temperature for 15 minutes, the in vitro SPF was measured using SPF-290AS (Solar light, USA) and calculated according to the following formula. The measured in vitro SPF values ​​and calculated UV blocking efficiency values ​​are shown in Table 6.

[0064]

number

[0065] [Table 6]

[0066] From the results in Table 6, it was confirmed that when both a water-soluble UV blocker and an oil-soluble UV blocker are contained, the UV blocking efficiency is higher than when only an oil-soluble UV blocker is contained.

[0067] The principle by which Example 13 achieves the same level of SPF as Comparative Example 4 with a smaller amount of UV screening agent is shown in Figure 4. When the cosmetic composition is applied to the skin, the internal and external phases that were temporarily combined by emulsification are separated again. At this time, when the UV screening agent is uniformly contained in the internal and external phases as in Example 13, it is understood that the voids that occur after application, i.e., areas that do not contain the UV screening agent, are reduced, and the UV screening efficiency is increased.

[0068] Experimental Example 4: Confirmation of the cloudiness improving effect of a cosmetic composition containing a water-soluble thickener having a hydrophobic group, an oil thickener, and a water-soluble UV blocking agent In order to compare the effect of improving opacity of the cosmetic composition according to the present invention, Comparative Example 5 was prepared with the composition and content as shown in Table 7, and the opacity was compared with that of Example 1.

[0069] [Table 7]

[0070] Specifically, each composition was evaluated by the following evaluation methods.

[0071] Evaluation 1. Visual evaluation Each composition was applied to a glass plate to a thickness of 3 μm, and then placed on a piece of paper with writing on it to evaluate whether the writing on the opposite side could be seen. The appearance is shown in FIG. 5. As a result of the evaluation, Example 1 was superior in transparency compared to Comparative Example 5, and the writing on the opposite side could be seen, while Comparative Example 5 was opaque, and the writing on the opposite side could not be seen. Generally, the higher the turbidity, the more pronounced the cloudiness appears, so it was predicted that Example 1 would have less cloudiness than Comparative Example 5.

[0072] Evaluation 2. Evaluation using a color difference meter Each composition was applied to a glass plate to a thickness of 3 μm, and then measured using a color difference meter (CR-400, MINOLTA, JAPAN). The measured values ​​were then substituted into the following formula to calculate the white turbidity, which is shown in Table 8.

[0073] White turbidity (W)=100-[(100-L * ) 2 +(a * ) 2 +(b * ) 2 ] 1 / 2

[0074] [Table 8]

[0075] As a result, it was confirmed that Example 1 had a significantly lower white turbidity than Comparative Example 5, both in terms of the subjective visual evaluation and the objective measurement results using a color difference meter.

[0076] Evaluation 3. Evaluation by visible light transmittance Each composition was applied to a glass plate to a thickness of 3 μm, and then the transmittance in the visible light region (400-990 nm) was measured using a spectrophotometer (Varioskan LUX, thermos scientific, USA), and the transmittance area over the wavelength range was calculated and compared. The results of the transmittance measurement are shown in FIG. 6, and the calculated transmittance area is shown in Table 9.

[0077] [Table 9]

[0078] As a result, it was confirmed that the light transmittance of Example 1 was higher than that of Comparative Example 5 throughout the entire region from 400 to 990 nm, and the transmittance area was significantly higher, and it was confirmed that Example 1 had the best transparency upon application. [Industrial Applicability]

[0079] The cosmetic composition for blocking ultraviolet rays according to the present invention contains a water-soluble organic ultraviolet ray blocking agent and a water-soluble thickener in the aqueous phase, and contains an oil-based thickener and an oil-soluble organic ultraviolet ray blocking agent in the oil phase. Since coalescence between emulsified particles of an oil-in-water (O / W) preparation is prevented, the problem of phase separation due to long-term storage or high-temperature storage is resolved, and phase stability is improved. Since the cosmetic composition contains only an organic ultraviolet ray blocking agent, no cloudiness occurs, the composition exhibits a sufficient ultraviolet ray protection index, and has a good feel when used.

Claims

1. The cosmetic composition for blocking ultraviolet rays comprises an aqueous phase containing a water-soluble organic ultraviolet blocking agent and a water-soluble thickener, and an oil phase containing an oil-soluble organic ultraviolet blocking agent and an oil thickener, and is an oil-in-water (O / W) formulation.

2. The cosmetic composition for blocking ultraviolet rays according to claim 1, wherein the water-soluble organic ultraviolet blocking agent is at least one selected from the group consisting of phenylbenzimidazole sulfonic acid and terephthalylidene dicamphor sulfonic acid.

3. The cosmetic composition for blocking ultraviolet rays according to claim 2, wherein the water-soluble organic ultraviolet blocking agent is contained in an amount of 0.01 to 20% by weight based on the total weight of the composition.

4. The ultraviolet blocking cosmetic composition according to claim 1 , wherein the water-soluble thickener is a water-soluble thickener having a hydrophobic group.

5. 5. The ultraviolet blocking cosmetic composition according to claim 4, wherein the water-soluble thickener having a hydrophobic group is at least one selected from the group consisting of acrylates / C10-30 alkyl acrylate crosspolymer, sodium polyacrylate, sodium polyacryloyldimethyltaurate, sodium acrylate / beheneth-25 methacrylate crosspolymer, sodium acrylate / sodium acryloyldimethyltaurate copolymer, sodium acrylate / acryloyldimethate / dimethylacrylamide crosspolymer, acrylates / beheneth-25 methacrylate copolymer, acrylate copolymer, ammonium acryloyldimethyltaurate / beheneth-25 methacrylate crosspolymer, ammonium acryloyldimethyltaurate / VP copolymer, polyacrylate-13, polyacrylate crosspolymer-6, polyacrylamide, PID-240 / HDI copolymer bis-decyltetradeceth-20 ether, and hydroxyethyl acrylate / sodium acryloyldimethyltaurate copolymer.

6. 6. The cosmetic composition for blocking ultraviolet rays according to claim 5, wherein the water-soluble thickener is contained in an amount of 0.001 to 5% by weight based on the total composition.

7. The oil thickeners include polyamide-8, dextrin palmitate, dextrin palmitate / ethylhexanoate, stearoyl inulin, polyurethane-79, dibutyl ethylhexanoyl glutamide, dibutyl lauroyl glutamide, and poly C10-30 alkyl acrylate.

2. The cosmetic composition for blocking ultraviolet light according to claim 1, wherein the at least one selected from the group consisting of

8. 8. The cosmetic composition for blocking ultraviolet rays according to claim 7, wherein the oil thickener is contained in an amount of 0.01 to 15% by weight based on the total weight of the composition.

9. The oil-soluble organic UV blocking agent includes butyl methoxydibenzoylmethane, diethylamino hydroxybenzoyl hexyl benzoate, ethylhexyl triazone, diethylhexyl butamido triazone, bis-ethylhexyloxyphenol methoxyphenyl triazine, drometrizole trisiloxane, and tetramethylphenyl trisiloxane.

2. The ultraviolet blocking cosmetic composition according to claim 1, wherein the at least one selected from the group consisting of benzotriazolyl tetramethylbutylphenol, methylene bis-benzotriazolyl tetramethylbutylphenol, and tris-biphenyl triazine.

10. The cosmetic composition for blocking ultraviolet rays according to claim 9, wherein the oil-soluble organic ultraviolet blocking agent is contained in an amount of 0.01 to 20% by weight based on the total composition.

11. The ultraviolet blocking cosmetic composition according to claim 1 , further comprising a polyglyceryl-based emulsifier in the oil phase of the composition.

12. The ultraviolet blocking cosmetic composition according to claim 11, wherein the polyglyceryl-based emulsifier is at least one selected from the group consisting of polyglyceryl-3 methylglucose distearate, polyglyceryl-3 distearate, polyglyceryl-4 caprate, polyglyceryl-6 stearate, polyglyceryl-6 behenate, polyglyceryl-6 dicaprate, and polyglyceryl-6 laurate.

13. The cosmetic composition for blocking ultraviolet rays according to claim 11, wherein the polyglyceryl-based emulsifier is contained in an amount of 0.01 to 10% by weight based on the total weight of the composition.

14. The cosmetic composition for blocking ultraviolet rays according to claim 1, wherein the cosmetic composition does not contain an inorganic ultraviolet blocking agent and is therefore free from cloudiness.

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