Water-resistant and washable solid-phase ultraviolet blocking cosmetic composition

Abstract

The present invention provides a solid cosmetic composition that includes a UV blocker, a fatty acid, and a wax, and has excellent water resistance and / or cleansability, and can effectively block UV rays. More specifically, the UV blocking cosmetic composition of the present invention has excellent water resistance at low pH, but changes to excellent cleansing properties at high pH, ​​such as when washing the face, making it useful for use.

Description

[Technical Field]

[0001] The present invention relates to a cosmetic composition for blocking ultraviolet rays, and more particularly to a cosmetic composition for blocking ultraviolet rays that has excellent water resistance and cleansing properties.

[0002] This application claims priority based on Korean Patent Application No. 10-2020-0069819 filed on June 9, 2020, and Korean Patent Application No. 10-2020-0101070 filed on August 12, 2020, the entire contents of which are incorporated herein by reference in their entirety in their specifications and drawings. [Background technology]

[0003] Sunscreens that are easily washed away by sweat and water do not adequately protect the skin from UV rays, so water resistance is important for UV-blocking cosmetics. However, cleansability is also important. If UV-blocking agents remain on the skin, they can feel foreign and cause skin problems. Therefore, the ideal UV-blocking cosmetics should be resistant to washing away by water and sweat, yet have high cleansing power and be easy to remove.

[0004] Recently, stick-type UV protection cosmetics have been developed. The greatest advantage of stick-type sunscreens is that they can be applied without rubbing the cosmetics on the hands. Conventional stick-type cosmetics are manufactured using either an oil-phase polymer or a wax. When wax is used, lip wax or ceresin wax is mainly used.

[0005] On the other hand, fatty acids are not typically used in stick-type cosmetics because they are difficult to impart with high hardness and a high melting point. That is, materials with low melting points are difficult to use in the manufacture of conventional solid cosmetics due to concerns about product stability and quality. For example, when stored at high temperatures, some of the product may melt, resulting in a change in quality. Over time, the product may lose hardness, causing it to crumble during use. For these reasons, fatty acids have been unsuitable as raw materials for the manufacture of solid cosmetics. Therefore, waxes with higher melting points have been used to manufacture solid cosmetics, and even if fatty acids are included, their content has been formulated at a lower level than other waxes.

[0006] As mentioned above, water resistance and ease of cleaning are important factors for UV screening agents, but it is difficult to achieve both simultaneously. Furthermore, it is extremely difficult to achieve both water resistance and ease of cleaning while also enjoying the convenience of use that solid dosage forms offer. Therefore, there is a need to develop a UV screening agent that satisfies all three of these properties. Summary of the Invention [Problem to be solved by the invention]

[0007] An object of the present invention is to provide a cosmetic composition for blocking ultraviolet rays that has excellent water resistance and also excellent cleansing properties.

[0008] Another object of the present invention is to provide a solid-phase cosmetic composition for blocking ultraviolet rays, which is easy to use and has excellent water resistance and washability. [Means for solving the problem]

[0009] In order to achieve the above object, the inventors of the present invention discovered that a solid-phase UV protection cosmetic composition containing specific ingredients, particularly a high content of fatty acids, is stable and does not wash away easily with water or sweat having a low pH, but is easily removed with soapy water having a high pH, ​​and thus completed the present invention.

[0010] When a solid cosmetic composition containing fatty acids is prepared for UV protection, it provides water resistance due to its hydrophobic properties when applied to the skin. However, when it comes into contact with water with a high pH, ​​such as soapy water, the fatty acids undergo a saponification reaction, exhibiting surfactant properties that make it easier to wash away oily ingredients applied to the skin. To achieve this purpose, the content of fatty acids in the solid cosmetic composition is important.

[0011] One aspect of the present invention provides a cosmetic composition for blocking ultraviolet rays, which comprises an ultraviolet blocking agent, a fatty acid, an oil, and a wax, wherein the fatty acid accounts for 5 to 40 wt % of the total weight of the composition, and which is in a solid phase.

[0012] Oil-in-water formulations contain an emulsifier, which re-emulsifies the UV-blocking film on the skin, and therefore have the disadvantage of being inherently less water-resistant due to the nature of the formulation.

[0013] Furthermore, in the case of a water-in-oil emulsion, even if it has water resistance, the structural characteristics of the fatty acid make it difficult to stabilize the fatty acid because it forms a competitive relationship with the emulsifier at the interface, which is a drawback in that it is difficult to contain a high content of fatty acid.

[0014] In contrast, a solid phase (solid) formulation can have both water resistance and ease of washing, and is easy to use, providing various advantages as a cosmetic composition.

[0015] In the present invention, the object of the present invention can be achieved by appropriately selecting the solid phase dosage form characteristics, the fatty acid characteristics, and the fatty acid content.

[0016] In one desirable embodiment of the present invention, the composition according to the present invention is substantially free of water.

[0017] In the present invention, the term "substantially free" means that the content is less than 5 wt. %, preferably less than 3 wt. %, more preferably less than 1 wt. %, more preferably less than 0.5 wt. %, more preferably less than 0.1 wt. %, and even more preferably less than 0.01 wt. % of the total weight of the composition. Absolute absence of any component (0 wt. %) may also be included in the "substantially free" range of the present invention.

[0018] Thus, desirably, compositions according to the present disclosure may be free of water or contain less than 5% by weight, more desirably less than 3% by weight, and even more desirably less than 1% by weight, based on the total weight of the composition.

[0019] The cosmetic composition according to the present invention is not dispersible in water of pH 7, but is dispersible in an aqueous solution of pH 9-14.

[0020] In the present invention, the term "dispersion" means that one substance (dispersion medium) is uniformly distributed in another substance without settling to the bottom layer or floating to the top layer of the dispersion medium. In particular, "dispersion" in this specification may mean that no separate phases are observed after dispersion.

[0021] The cosmetic composition according to the present invention is a solid-phase cosmetic composition for blocking ultraviolet light, which has improved water resistance and washability.

[0022] In one embodiment of the present invention, the wax is contained in an amount of 5 to 40% by weight, preferably 6 to 30% by weight, more preferably 12 to 25% by weight, based on the total weight of the composition.

[0023] The wax is added to form a solid dosage form. If the wax content is too low, it is difficult to ensure the stability of the composition, and if the wax content is too high, the composition may be hard and uncomfortable to use, or the effects of the invention may be impaired.

[0024] In the present invention, the wax may be, but is not limited to, vegetable waxes such as candelilla wax, carnauba wax, or rice wax; animal waxes such as beeswax or lanolin; mineral waxes such as ozokerite or ceresin wax; petroleum waxes such as paraffin wax or microcrystalline wax; or synthetic waxes such as polyethylene wax, polypropylene wax, and ethylene / propylene copolymer.

[0025] In the present invention, for example, the polyethylene wax may have a melting point of 50 to 120° C., preferably 60 to 110° C., and more preferably 70 to 100° C. In the present invention, for example, PERFORMALENE 400 manufactured by New Phase Technologies may be used as the polyethylene wax. TM (trade name) may be used.

[0026] In the present invention, the synthetic wax may be, for example, LIPWAX PZ80-20 manufactured by JAPAN NATURAL PRODUCTS. TM (trade name) may be used.

[0027] In the present invention, the UV blocking agent may be an inorganic UV blocking agent and / or an organic UV blocking agent.

[0028] In the present invention, the inorganic UV blocker may be, but is not limited to, titanium oxide, zinc oxide, etc. However, zinc oxide is undesirable because it can negatively affect the cleansing properties by releasing divalent zinc ions and interfering with the saponification reaction of fatty acids.

[0029] In the present invention, examples of the organic UV blocker include, but are not limited to, ethylhexyl methoxycinnamate, ethylhexyl salicylate, bis-ethylhexyloxyphenol methoxyphenyl triazine, diethylaminohydroxybenzoyl hexyl benzoate, octocrylene, butylmethoxydibenzoylmethane, oxybenzone, octyl triazone, menthyl anthranilate, phenylbenzimidazole sulfonic acid, 2-hydroxy-4-methoxybenzophenone sulfonic acid, 3,4-methylbenzylidene camphor, isoamyl p-methoxycinnamate, homosalate, drometrizole trisiloxane, benzophenone-3, ethylhexyl triazone, DEA-methoxycinnamate, phenyldibenzimidazole tetrasulfonate disodium, benphenone-8, TEA-salicylate, butylmethoxydibenzoylmethane, and dimethyl PABA ethylhexyl, which may be used alone or in combination.

[0030] Preferably, the organic UV blocking agent may be ethylhexyl methoxycinnamate, octocrylene, ethylhexyl salicylate, bis-ethylhexyloxyphenol methoxyphenyl triazine, diethylaminohydroxybenzoyl hexyl benzoate, or the like, which may be used alone or in combination.

[0031] In the present invention, the ultraviolet blocking agent may be contained in an amount of 10 to 40% by weight, preferably 15 to 35% by weight, and more preferably 18 to 30% by weight, based on the total weight of the composition.

[0032] The solid cosmetic composition according to the present invention contains a high content of fatty acids. In the present invention, the fatty acid content is preferably 5 wt% or more, more preferably 10 wt% or more, based on the total weight of the composition. If the fatty acid content is less than 5 wt%, the effects of the present invention may be inferior. That is, the solid cosmetic composition according to the present invention contains 5 to 40 wt%, more preferably 10 to 30 wt%, of fatty acids based on the total weight of the composition.

[0033] In one preferred embodiment of the present invention, the composition according to the present invention comprises the fatty acid in an amount by weight greater than 1 to less than 5 times the weight of the wax.

[0034] When determining the content of the fatty acid, it is advisable to take into consideration the content of the wax as well. Wax components form a hard film, which can make cleaning difficult. In this case, formulating the content of the fatty acid higher than the content of the wax can help improve the effect of the invention.

[0035] In the present invention, the fatty acid may be in a solid or liquid phase at room temperature, preferably in a liquid phase at room temperature. When the fatty acid is in a liquid phase at room temperature, it improves the hardness of the dosage form and has little effect on stability, allowing for a high fatty acid content to be formulated. However, the effects of the present invention (UV blocking effect, water resistance, and detergency) are excellent whether a liquid-phase fatty acid, a solid-phase fatty acid, or a mixture thereof is used.

[0036] In the present invention, the fatty acid that is in a solid phase at room temperature can be used in a broad sense, including a semi-solid phase.

[0037] In one aspect of the present invention, when the composition according to the present invention contains both solid-phase fatty acids and liquid-phase fatty acids, the composition according to the present invention contains the liquid-phase fatty acids in an amount by weight that is more than 1 to less than 100 times the weight of the solid-phase fatty acids, preferably more than 1 to less than 50 times, more preferably more than 1 to less than 20 times, and even more preferably more than 1 to less than 8 times.

[0038] When the amount of liquid-phase fatty acids is greater than that of solid-phase fatty acids, various advantages are obtained, such as improving the sweating phenomenon of the dosage form.

[0039] In the present invention, the fatty acid may be a saturated fatty acid or an unsaturated fatty acid having 12 to 22 carbon atoms.

[0040] Preferably, in the present invention, the fatty acid may be stearic acid, palmitic acid, myristic acid, isostearic acid, behenic acid, or a mixture thereof. More preferably, the fatty acid is isostearic acid. In particular, when the fatty acid is isostearic acid, it is preferred because it has little effect on stability and excellent effect, and has many advantages such as a feeling of use.

[0041] In the present invention, the degree of neutralization of the fatty acid is preferably 5 or less, more preferably 1 or less, and most preferably 0 (non-neutralized fatty acid).

[0042] In the present invention, the oil contained in the cosmetic composition of the present invention may be any oil commonly used in cosmetic compositions, including, but not limited to, silicone oil, natural oil, ester oil, and hydrocarbon oil.

[0043] In the present invention, the silicone oil may be both a non-volatile silicone oil and a volatile silicone oil.The non-volatile silicone oil may include, but is not limited to, amodimethicone, bisphenylhexamethicone, dimethicone, hexadecylmethicone, methicone, phenyltrimethicone, simethicone, dimethylhydrogensiloxane, stearoxytrimethylsiloxane, vinyldimethicone, etc.The volatile silicone oil may include, but is not limited to, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, hexamethyldisiloxane, cyclomethicone, etc.

[0044] In the present invention, the natural oil may be oil obtained from plants existing in nature.For example, the natural oil may be sunflower seed oil, avocado oil, orange oil, macadamia seed oil, lemon oil, pine nut oil, jojoba seed oil, olive oil, green tea seed oil, coconut oil, rosehip fruit oil, damask rose oil, Brazil nut seed oil, drumstick seed oil, grapefruit seed oil, soybean oil, vanilla fruit oil, etc., but is not limited thereto.

[0045] In the present invention, the ester oil may be an ester compound of a fatty acid and a fatty alcohol. For example, the ester oil may include, but is not limited to, hexa fatty acid (C5-9) dipentaerythrityl esters, alkyl octanoate (C12-15), myristyl lactate, cetyl ethylhexanoate, cetyl octanoate, isopropyl myristate, octyldodecyl myristate, hexyl laurate, dialkyl malate (C12,13), myristyl lactate, octyldodecyl stearoyloxystearate, diisostearyl malate, pentaerythrityl triethylhexanoin tetraethylhexanoate, and diglyceryl triisostearate.

[0046] In the present invention, the hydrocarbon oil may include, but is not limited to, petroleum oils such as liquid paraffin, Vaseline, and isoparaffins; synthetic oils such as hydrogenated polydecene, synthetic squalane, and polybutene; and vegetable oils such as vegetable squalane and hydrogenated squalane. Specific examples of the hydrocarbon oil include, but are not limited to, isohexadecane, isododecane, undecane, squalane (vegetable squalane), synthetic squalane, hydrogenated polydecene α-olefin oligomer, and hydrogenated polyisobutene.

[0047] Preferably, the oil may be hexyl laurate, triethylhexanoin, or a mixture thereof.

[0048] In the present invention, the oil may be contained in an amount of 5 to 55% by weight, preferably 10 to 50% by weight, more preferably 15 to 40% by weight, and even more preferably 25 to 40% by weight, based on the total weight of the composition.

[0049] In one aspect of the present invention, it is desirable that the cosmetic composition according to the present invention is substantially free of neutralizing agents.

[0050] In the present invention, the cosmetic composition according to the present invention may further contain all kinds of additives that can be used in ordinary cosmetics, such as preservatives, fragrances, pigments, powders, thickeners, opacifiers, binders, viscosity adjusters, colorants, fragrances, film-forming agents, etc. Such additives are readily available commercially.

[0051] In the present invention, the solid cosmetic composition according to the present invention may contain a powder to improve the feeling of use. Examples of the powder include, but are not limited to, silica, talc, PMMA (polymethylmethacrylate) powder, and polymethylsilsesquioxane. Preferably, the powder is polymethylsilsesquioxane.

[0052] In another embodiment of the present invention, the composition according to the present invention comprises, based on the total weight of the composition, 10 to 40% by weight (preferably 15 to 35% by weight, more preferably 18 to 30% by weight) of an ultraviolet screening agent which is ethylhexyl methoxycinnamate, octocrylene, ethylhexyl salicylate, bis-ethylhexyloxyphenol methoxyphenyl triazine, ethylaminohydroxybenzoyl hexyl benzoate, or a mixture thereof; and 5 to 40% by weight (preferably 15 to 35% by weight, more preferably 18 to 30% by weight) of a fatty acid which is myristic acid, palmitic acid, stearic acid, isostearic acid, behenic acid, or a mixture thereof. 10 to 30% by weight); 5 to 40% by weight (preferably 6 to 30% by weight, more preferably 12 to 25% by weight) of a wax which is polyethylene, ethylene / propylene copolymer, synthetic wax, or a mixture thereof; and 5 to 55% by weight (preferably 10 to 50% by weight, more preferably 15 to 40% by weight, and even more preferably 25 to 40% by weight) of an oil which is triethylhexanoin, hexyl laurate, or a mixture thereof, wherein the composition is in a solid phase, and the composition does not disperse at pH 7 but disperses in an aqueous solution of pH 9 to 14.

[0053] In the present invention, the composition according to the present invention may further contain 5 to 30% by weight (preferably 7 to 25% by weight, more preferably 9 to 22% by weight) of polymethylsilsesquioxane relative to the total weight of the composition.

[0054] Preferably, all of the components described in the present invention do not exceed the maximum use values ​​stipulated by the relevant laws and regulations of Korea, China, the United States, Europe, Japan, etc. (e.g., Regulations Concerning Cosmetic Safety Standards (Korea), Cosmetic Safety Technical Standards (China), Hygiene Standards (China)). That is, preferably, the cosmetic composition according to the present invention contains the components according to the present invention in the amount permitted by the relevant laws and regulations of each country. [Effects of the Invention]

[0055] The present invention provides a solid cosmetic composition that has excellent water resistance and cleansing properties and can effectively block UV rays. More specifically, the cosmetic composition of the present invention provides a UV blocking composition that has excellent water resistance at low pH and converts to have excellent cleansing properties at high pH when cleansing the skin. [Brief explanation of the drawings]

[0056] [Figure 1] The results of the dispersion experiments for Comparative Example 1 and Example 14 are shown. [Figure 2] The results of the dispersion experiments for Comparative Example 1 and Examples 1 to 10 are shown. [Figure 3] 1 is a graph showing the measurement results of cutting hardness in Examples 11 to 15. [Figure 4] 1 is a graph showing the results of measuring the melting points of Examples 11 to 15. DETAILED DESCRIPTION OF THE INVENTION

[0057] The present invention will be described in detail below with reference to examples to aid in understanding the present invention. However, the examples according to the present invention can be modified into various other forms, and the scope of the present invention should not be construed as being limited to the following examples. The examples of the present invention are provided to more completely explain the present invention to those skilled in the art. [Example]

[0058] Example 1. Preparation of Comparative and Example Products Depending on the Fatty Acid Content Stick-type sunscreens were prepared according to the formulations shown in Table 1 below. All the ingredients were mixed according to the recipe shown in Table 1, heated to 90°C, mixed thoroughly until completely dissolved, and then placed in a stick-shaped container and cooled to room temperature to produce the product.

[0059] [Table 1]

[0060] In Table 1, the polyethylene wax is PERFORMALENE 400 from New Phase Technologies. TM (trade name), and the synthetic wax and ethylene / propylene copolymer used was LIPWAX PZ80-20 from JAPAN NATURAL PRODUCTS, which contains a specific wax and ethylene / propylene copolymer in a weight ratio of 8:2. TM (trade name), and SESQ-101 from N&M TECH was used as polymethylsilsesquioxane. TM (trade name) was used. The same raw materials were used in the other examples below.

[0061] Example 2. Preparation of Examples Depending on the Type of Fatty Acid A stick-type sunscreen was prepared according to the formula shown in Table 2. All ingredients were mixed according to the formula shown in Table 2, heated to 90°C, and mixed thoroughly until completely dissolved. The mixture was then placed in a stick-type container and cooled to room temperature.

[0062] [Table 2]

[0063] Example 3. Preparation of Examples Depending on the Content of Fatty Acids (Including the Use of Both Solid-Phase and Liquid-Phase Fatty Acids) A stick-type sunscreen was prepared according to the formula shown in Table 3. All the ingredients were mixed according to the formula shown in Table 3, heated to 90°C, and mixed thoroughly until completely dissolved. The mixture was then placed in a stick-type container and cooled to room temperature.

[0064] [Table 3]

[0065] Experimental example 1. Evaluation of dispersion degree (dispersion experiment) The dispersion experiment was carried out by dispersing a solid sunscreen stick in ordinary purified water with a pH of 7 and a tromethamine aqueous solution with a pH of 10, and observing the degree of dispersion (Fig. 1, Fig. 2 and Table 4).

[0066] As a result, it was confirmed that Comparative Example 1 did not disperse in either the pH 7 or 10 aqueous solution, but all of the Examples dispersed. When the fatty acid content was high relative to the wax, the degree of dispersion was particularly excellent.

[0067] [Table 4] ×: No dispersion at all, clear water observed. △: Slightly dispersed and the water is slightly cloudy. ○: Dispersed and the water is cloudy. ◎: Dispersion occurred, the water was cloudy, and a foam layer was formed.

[0068] Experimental example 2: Water resistance evaluation A water resistance test was carried out on the sunscreen sticks prepared according to the formulation in Table 1. The sunscreen sticks were applied at a concentration of 1.3 mg / cm. 2 The PMMA plate was coated with the coating at a thickness of 100 μm and then dried for at least 15 minutes. The transmittance of the dried PMMA plate was measured using a spectrophotometer. Transmittance was measured at 1 nm intervals at three different locations on the PMMA plate in the 290-400 nm wavelength range. To evaluate water resistance, a round stainless steel container was filled with tap water and the PMMA plate was held in place so that it was completely immersed in the water. After stirring at 3,000 rpm using a disperser for 30 minutes, the PMMA plate was removed and dried for at least 30 minutes. The transmittance of the completely dried PMMA plate in the 290-400 nm wavelength range was measured using a spectrophotometer. The transmittance measured before and after water immersion was converted to in vitro SPF values ​​using the following formula and compared. The water resistance ratio was calculated by dividing the SPF after water immersion by the SPF before water immersion. The results are shown in Table 5 below.

[0069]

number

[0070] Eλ: erythema action spectrum Sλ: Spectral irradiance (W / m 2 / nm) Tλ: Transmittance

[0071] As a result, it was confirmed that the sunscreen sticks of Examples 1 to 10 containing fatty acids had a better water resistance ratio than the sunscreen stick without fatty acids (Comparative Example 1). This is because fatty acids are hydrophobic and do not react with water at a neutral pH, so they do not affect the water resistance of the sunscreen stick, but rather react with trace amounts of diphenyl ions in water to form insoluble precipitates, improving water resistance, and the scattering effect of the insoluble precipitates further increases the SPF after immersion in water.

[0072] [Table 5]

[0073] Experimental Example 3: Detergency Evaluation The sunscreen sticks prepared according to the formulations in Table 1 were subjected to a cleaning power evaluation. Each sunscreen stick was applied to a PMMA plate at a concentration of 1.3 mg / cm. 2 After applying the coating to a thickness of 100 mm, the transmittance in the 290-400 nm range was measured using a spectrophotometer. The transmittance was measured at three different positions on the PMMA plate. Then, 0.2 g of a 20% dispersion of facial cleanser was placed on the PMMA plate and thoroughly cleansed for 20 seconds using an electric cleanser. After rinsing thoroughly with lukewarm water and allowing it to dry completely for at least 30 minutes, the transmittance was measured again using a spectrophotometer. The cleansing rate was calculated using the following formula. Values ​​that transmitted more UV light than the control plate were substituted for the value of the control plate, and the cleansing rate was assumed to be 100%. The results are shown in Table 6 below.

[0074]

number

[0075] Examples 1 to 10 showed higher cleaning rates than Comparative Example 1. This is because when fatty acids come into contact with high-pH soapy water, a saponification reaction occurs, giving them both properties. Fatty acids not only act as surfactants, but also help make the oil film easier to wash away by being released from the sunscreen oil film through the saponification reaction.

[0076] [Table 6]

[0077] Experimental Example 4: Hardness, melting point and long-term stability at high temperatures When a high content of solid-phase fatty acid is formulated with wax, it may affect stability, such as reducing hardness and melting point. Therefore, care should be taken when using a high content of fatty acid in a solid formulation. This is thought to be because the solid-phase fatty acid participates in crystal formation and affects the crystal structure, but the present invention is not limited to this theoretical reasoning.

[0078] Experimental Example 4-1. Cutting hardness measurement The cutting hardness was measured and the results are shown in Figure 3. To measure the cutting hardness, each specimen was cut into a cylindrical shape with a diameter of approximately 2.5 cm. A hardness tester was used to measure the cutting hardness at a depth of 1.5 cm at a speed of 2 cm / min using an applicator #30 equipped with piano wire.

[0079] As a result, the hardness of Example 14, which used isostearic acid, which is liquid at room temperature, was the highest. This is presumably because the fatty acid in the solid phase affected the crystalline structure of the wax, while the fatty acid in the liquid phase did not affect the crystalline structure. However, the present invention is not limited to such a theoretical reasoning.

[0080] Experimental Example 4-2. Melting point measurement The melting points of various fatty acids were observed using DSC. DSC was performed by increasing the temperature from 30°C to 95°C at a rate of 10°C per minute. Figure 4 shows the melting point measurement results.

[0081] The measurement results showed that when solid-phase fatty acids are used, the melting point of the solid dosage form is lowered due to the influence of the fatty acid's inherent melting point. However, when liquid-phase fatty acids are used, the phenomenon of lowering the melting point was not observed. This is presumably because solid-phase fatty acids participate in crystal formation and affect the crystal structure, while liquid-phase fatty acids do not participate in crystal formation and therefore do not affect the crystal structure. However, the present invention is not limited to such theoretical reasoning.

[0082] Experimental Example 4-3. Long-term stability experiment at high temperatures The prepared sunscreen sticks were subjected to stability tests, and the experimental results are shown in Tables 7 and 8 below.

[0083] As a result of the experiment, Examples 11 and 12, which have low melting points, were unable to maintain their original hardness at high temperatures, and showed a tendency for their hardness to decrease when exposed to high temperature conditions for a long period of time, such as one month or more.

[0084] Sweating is an important stability factor in solid oil-wax gel formulations. When a high content of solid fatty acid was used, sweating was observed, but when a liquid fatty acid was used, sweating was not observed.

[0085] [Table 7] 〇: Excellent stability. △: Shows intermediate stability. ×: Poor stability.

[0086] When both solid and liquid phase fatty acids were used, sweating was observed when the content of fatty acids in the liquid phase was lower than that in the solid phase, as in Examples 16 to 19, but sweating was improved when the content of fatty acids in the liquid phase was higher, as in Examples 20 to 22. Furthermore, when solid phase fatty acids were included but no wax was included or the wax content was low, as in Comparative Examples 2 and 3, the product was brittle for use as a stick-type sunscreen, making it unsuitable as a solid phase cosmetic, and its stability over time at high temperatures was poor.

[0087] [Table 8] 〇: Excellent stability. △: Shows intermediate stability. ×: Poor stability.

[0088] Experimental Example 5. Evaluation of water resistance and cleaning power Stick-type sunscreens were prepared and evaluated using the methods described above according to the formulations shown in Table 2. The results of the water resistance and cleansing properties are shown in Table 9 below. The evaluation results showed high water resistance and cleansing rates for all types of fatty acids.

[0089] [Table 9]

Claims

1. Contains UV blockers, fatty acids, oils and waxes, The ultraviolet blocking agent is present in an amount of 10 to 40% by weight based on the total weight of the composition; A cosmetic composition for blocking ultraviolet rays, wherein the fatty acid is isostearic acid in an amount of 15 to 40% by weight based on the total weight of the composition, the oil is present in an amount of 5 to 55% by weight relative to the total weight of the composition; The cosmetic composition for blocking ultraviolet rays, wherein the wax is in a solid state and is present in an amount of 5 to 40% by weight based on the total weight of the composition.

2. The cosmetic composition of claim 1 , wherein the composition is substantially free of water.

3. The cosmetic composition according to claim 1, wherein the cosmetic composition does not disperse in an aqueous solution of pH 7, but disperses in an aqueous solution of pH 9 to 14.

4. The cosmetic composition according to claim 1 , wherein the fatty acid is contained in an amount by weight that is more than 1 to less than 5 times the weight of the wax.

5. The cosmetic composition according to claim 1 , wherein the fatty acid is liquid at room temperature.

6. based on the total weight of the composition, 10 to 40% by weight of an ultraviolet screening agent which is ethylhexyl methoxycinnamate, octocrylene, ethylhexyl salicylate, bis-ethylhexyloxyphenol methoxyphenyl triazine, diethylamino hydroxybenzoyl hexyl benzoate, or a mixture thereof; 15 to 40% by weight of a fatty acid which is isostearic acid; 5 to 40% by weight of a wax which is polyethylene, an ethylene / propylene copolymer, a synthetic wax, or a mixture thereof; 5 to 55% by weight of an oil which is triethylhexanoin, hexyl laurate, or a mixture thereof; A cosmetic composition for blocking ultraviolet rays, which is solid and does not disperse in an aqueous solution of pH 7, but disperses in an aqueous solution of pH 9 to 14.

7. The cosmetic composition according to claim 6, further comprising 5 to 30 wt % of polymethylsilsesquioxane, based on the total weight of the composition.

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