UV-blocking cosmetic composition with increased UV-blocking efficiency due to exposure to UV rays

Abstract

The present invention relates to a cosmetic composition for blocking ultraviolet rays, and more particularly to a cosmetic composition for blocking ultraviolet rays comprising a UV blocker having a methoxycinnamic acid structure and a specific weight of polar oil. The cosmetic composition for blocking ultraviolet rays of the present invention has a significantly increased UV blocking efficiency when exposed to ultraviolet rays and has a significantly excellent feel when used.

Description

[Technical field]

[0001] The present invention relates to a cosmetic composition for blocking ultraviolet rays, the efficiency of which is increased by exposure to ultraviolet rays.

[0002] This application claims priority to Korean Patent Application No. 10-2019-0023391 filed on February 27, 2019, Korean Patent Application No. 10-2019-0037278 filed on March 29, 2019, Korean Patent Application No. 10-2019-0106892 filed on August 29, 2019, and Korean Patent Application No. 10-2019-0106893 filed on August 29, 2019, the contents of which in their specifications and drawings are incorporated herein in their entirety. [Background technology]

[0003] Ultraviolet rays emitted from sunlight act as the main cause of erythema, edema, freckles, and skin cancer on the skin. In recent years, many studies on various skin diseases caused by ultraviolet rays have been actively conducted. Generally, ultraviolet rays are classified according to their wavelength into UV-C with a wavelength of 200 to 280 nm, UV-B with a wavelength of 280 to 320 nm, and UV-A with a wavelength of 320 to 400 nm. UV-C passes through the ozone layer and disappears without reaching the earth's surface, while UV-B penetrates the epidermis and causes erythema, freckles, edema, etc. UV-A penetrates the dermis and causes skin cancer, promotes skin aging such as wrinkles and melanin formation, and is known to induce skin irritation. Numerous epidemiological studies have proven a strong association between sunlight exposure and human skin cancer.

[0004] Due to the above-mentioned dangers associated with sun exposure, public interest in UV protection products has increased, and as a result, UV protection products with various types of SPF (sun protection factor) are available on the market. To have a high SPF value, UV protection products contain inorganic UV protection agents such as titanium dioxide and zinc oxide, or organic UV protection agents such as ethylhexyl methoxycinnamate, ethylhexyl salicylate, octocrylene, butyl methoxydibenzoylmethane, bis-ethylhexyloxyphenol methoxyphenyl triazine, and diethylamino hydroxybenzoyl hexyl benzoate.

[0005] The UV blocking efficiency of UV blocking cosmetics may decrease due to UV rays. In particular, UV blocking agents having a methoxycinnamic acid structure, such as ethylhexyl methoxycinnamate, isoamyl p-methoxycinnamate, or cinoxate, have a problem that their trans structure changes to a sheath structure due to UV rays, resulting in a decrease in the efficiency of absorbing light in the UV range. If the UV blocking efficiency decreases, UV rays cannot be blocked effectively, which may lead to skin aging and various skin diseases. In addition, as outdoor activities increase and the skin is exposed to sunlight for longer periods of time, UV blocking cosmetics must be repeatedly applied, which is inconvenient. To solve these problems, there is a need to develop a method for preventing the effect of the UV blocking agent having a methoxycinnamic acid structure itself from decreasing in a UV blocking cosmetic composition, or a method for further enhancing the effect even when the same amount is used. Summary of the Invention [Problem to be solved by the invention]

[0006] The problem to be solved by the present invention is to provide a cosmetic composition for blocking ultraviolet rays, which solves the problem that the ultraviolet ray blocking efficiency of an ultraviolet ray blocking agent having a methoxycinnamate structure decreases when exposed to ultraviolet rays, and which increases the ultraviolet ray blocking efficiency by exposure to ultraviolet rays. [Means for solving the problem]

[0007] As a result of intensive research to solve the above-mentioned problems of the prior art, the present inventors have made the surprising discovery that when a cosmetic composition containing a UV blocking agent having a methoxycinnamic acid structure is exposed to UV rays under certain conditions, the UV blocking efficiency actually increases, which led to the completion of the present invention.

[0008] The present inventors have found that the intermolecular distance of methoxycinnamic acid can be adjusted by changing the content of polar oil or hydrocarbon oil in the cosmetic composition containing the ultraviolet blocking agent. Specifically, if the intermolecular distance is large, ultraviolet light may cause the methoxycinnamic acid molecule in a trans structure to change to a sheath structure, resulting in a significant decrease in ultraviolet light absorption ability. However, if the intermolecular distance is sufficiently small, various photoreactants including dimers may be generated upon exposure to ultraviolet light. The π-π stacking with the photoreactants thus generated changes the π-π* transition energy level, and the wavelength range of absorbable energy may be expanded. The cosmetic composition containing the ultraviolet blocking agent of the present invention not only exhibits a significantly increased absorbance in the wavelength ranges of UV-A (320-400 nm) and UV-B (280-320 nm) compared to before ultraviolet light irradiation, but also exhibits a significantly increased SPF value.

[0009] The present invention provides a cosmetic composition for blocking ultraviolet rays, comprising an ultraviolet ray blocking agent having a methoxycinnamic acid structure and a polar oil. The present invention also provides a cosmetic composition for blocking ultraviolet rays, comprising an ultraviolet ray blocking agent having a methoxycinnamic acid structure and a hydrocarbon oil. The ultraviolet ray blocking agent having a methoxycinnamic acid structure may include at least one selected from the group consisting of ethylhexyl methoxycinnamate, isoamyl p-methoxycinnamate, cinoxate, and the like. The ultraviolet ray blocking agent having a methoxycinnamic acid structure may be included in an amount of 2 to 30% by weight, preferably 2 to 25% by weight, more preferably 2 to 20% by weight, based on the total weight of the composition. When the ultraviolet ray blocking agent having a methoxycinnamic acid structure is included in an amount of less than 2% by weight based on the total weight of the composition of the present invention, the SPF may be reduced by ultraviolet rays, and when it exceeds 30% by weight, the stability of the cosmetic formulation may be impaired.

[0010] In one embodiment, the polar oil may be an ester oil or triglyceride, and specifically may include at least one selected from the group consisting of cetyl ethylhexanoate, (caprylic / capric) glycerides, phenethyl benzoate, dicaprylyl carbonate, C12-15 alkyl benzoates, and octocrylene, but is not limited thereto. The polar oil may be 5% by weight or less, preferably 0.01-5% by weight, more preferably 0.05-4% by weight, based on the total weight of the composition. Alternatively, it is most preferable that no polar oil is included. If the content of the polar oil exceeds 5% by weight, the effect of increasing the SPF against ultraviolet rays is not achieved.

[0011] In one embodiment, the cosmetic composition for blocking ultraviolet rays comprising an ultraviolet ray blocking agent having a methoxycinnamic acid structure and a polar oil of the present invention may further comprise a hydrocarbon oil. In this case, the ultraviolet ray blocking effect is significantly increased and the application feeling on the skin is excellent. The hydrocarbon oil may include any one or more selected from the group consisting of liquid paraffin, light liquid isoparaffin, heavy liquid isoparaffin, petrolatum, n-paraffin, mineral oil, isoparaffin, isododecane, isohexadecane, polyisobutylene, hydrogenated polyisobutylene, polybutene, ozokerite, ceresin, microcrystalline wax, paraffin wax, polyethylene wax, polyethylene / polypropylene wax, squalane, squalene, pristane, polyisoprene, etc., but is not limited thereto.

[0012] The hydrocarbon oil may be contained in an amount of 5 to 30 wt%, preferably 5.1 to 30 wt%, 5.5 to 30 wt%, 6 to 30 wt%, 6.5 to 30 wt%, or 7 to 30 wt%, based on the total weight of the composition. Preferably, the hydrocarbon oil may be contained in an amount of 5 to 25 wt%, more preferably 5.1 to 25 wt%, 5.5 to 25 wt%, 6 to 25 wt%, 6.5 to 25 wt%, or 7 to 25 wt%, based on the total weight of the composition. Preferably, the hydrocarbon oil may be contained in an amount of 5 to 15 wt%, more preferably 5.1 to 15 wt%, 5.5 to 15 wt%, 6 to 15 wt%, 6.5 to 15 wt%, or 7 to 15 wt%, based on the total weight of the composition. If the hydrocarbon oil is contained in an amount of less than 5% by weight based on the total weight of the composition, the composition may feel too hard when used and may not meet the basic quality standards for cosmetics. If the amount of the hydrocarbon oil is more than 30% by weight, the stability of the formulation may be impaired.

[0013] In one embodiment, the cosmetic composition for blocking ultraviolet rays of the present invention may further include silicone oil, which is excellent in increasing the ultraviolet blocking efficiency by ultraviolet rays and also helps to improve the feeling of use. However, as described above, when the content of polar oil is limited, silicone oil is not compatible with ultraviolet blocking agents having a methoxycinnamic acid structure, so it is not desirable to include it in an excessive amount. The cosmetic composition for blocking ultraviolet rays of the present invention may be substantially free of silicone oil, and may include silicone oil in an amount of 15 wt % or less, preferably 10 wt % or less, more preferably 5 wt % or less, and even more preferably 3 wt % or less, based on the total weight of the composition. The silicone oil may be one or more selected from the group consisting of cyclotetrasiloxane, cyclopentasiloxane, cyclohexasiloxane, dimethicone, dimethiconol, and phenyltrimethicone, but is not limited thereto. The ultraviolet blocking agents contained in the cosmetic composition of the present invention, ethylhexyl methoxycinnamate or isoamyl paramethoxycinnamate, are not compatible with silicone oil, so if the composition contains more than 15% by weight of silicone oil, the stability at room temperature may decrease.

[0014] In one embodiment, the UV blocking cosmetic composition of the present invention may contain a UV blocking agent having a methoxycinnamic acid structure and a polar oil in a weight ratio of 1:0.01-1, preferably 1:0.01-0.8, more preferably 1:0.01-0.6, even more preferably 1:0.01-0.4, and even more preferably 1:0.01-0.2 (UV blocking agent having a methoxycinnamic acid structure: polar oil), but most preferably does not contain a polar oil. If the weight of the polar oil exceeds the above weight ratio range, the effect of increasing the UV blocking efficiency by UV rays is not achieved.

[0015] In one embodiment, the cosmetic composition for blocking ultraviolet rays of the present invention may contain an ultraviolet ray blocking agent having a methoxycinnamic acid structure and a hydrocarbon oil in a weight ratio of 1:0.2-15, preferably 1:0.2-8, more preferably 1:0.2-3 (ultraviolet ray blocking agent having a methoxycinnamic acid structure:hydrocarbon oil). The hydrocarbon oil may be contained in an appropriate weight ratio with the ultraviolet ray blocking agent to improve the feeling of use of the cosmetic composition within a range of 5% by weight or more based on the total weight of the composition. Outside the above range, the ultraviolet ray blocking efficiency by ultraviolet rays or the feeling of use of the cosmetic composition may be impaired.

[0016] In one embodiment, when the cosmetic composition for blocking ultraviolet rays of the present invention contains both a polar oil and a hydrocarbon oil, the polar oil and the hydrocarbon oil may be contained in a weight ratio (polar oil:hydrocarbon oil) of 1:1 to 300, preferably 1:1 to 200, and more preferably 1:1 to 100. If the weight ratio of the polar oil and the hydrocarbon oil is out of the above range, the ultraviolet ray blocking efficiency or the feeling of use of the cosmetic composition may be impaired.

[0017] In one embodiment, the cosmetic composition for blocking UV rays of the present invention may further include an inorganic UV blocking agent. The inorganic UV blocking agent may be, but is not limited to, titanium dioxide, zinc oxide, or iron oxide. In addition, the cosmetic composition for blocking UV rays of the present invention may further include, but is not limited to, a moisturizer, a thickener, a surfactant, an oil base, a preservative, an antioxidant, alcohol, a fragrance, a pH adjuster, or a natural extract.

[0018] The cosmetic composition according to the present invention can be prepared in any formulation commonly used in the art, for example, but not limited to, a solution, suspension, emulsion, paste, gel, cream, lotion, soap, surfactant-containing cleanser or oil. More specifically, it can be prepared in the form of a softening lotion, nourishing lotion, skin toner, nourishing cream, emulsion, cosmetic ointment, massage cream, essence, eye cream, cleansing cream, cleansing foam, cleansing water, pack, gel, makeup base, foundation, spray or powder. In one embodiment, the UV-blocking cosmetic composition of the present invention can be in the form of an emulsion, for example, water-in-oil (W / O) or oil-in-water (O / W) formulation.

[0019] In one embodiment, the present invention provides a cosmetic composition for blocking ultraviolet rays, comprising 2 to 30% by weight of an ultraviolet ray blocking agent having a methoxycinnamic acid structure, 5% by weight or less of a polar oil, and 5 to 30% by weight of a hydrocarbon oil, based on the total weight of the composition. The composition exhibits a significantly increased ultraviolet ray blocking effect after irradiation with ultraviolet rays, and the cosmetic composition also has a significantly excellent usability.

[0020] The cosmetic composition for blocking ultraviolet rays of the present invention has an SPF value that increases significantly after ultraviolet irradiation, specifically, the SPF value can increase by 3 to 80%, preferably by 5 to 77%, compared to before ultraviolet irradiation. The cosmetic composition for blocking ultraviolet rays of the present invention has an increased blocking effect against UV-A (320 to 400 nm) and UV-B (280 to 320 nm) after ultraviolet irradiation, preferably a significantly increased blocking effect against UV-B.

[0021] The present invention provides a method for preparing a cosmetic composition for blocking ultraviolet rays, comprising mixing an ultraviolet ray blocking agent having a methoxycinnamic acid structure with a polar oil in an amount of 5% by weight or less based on the total weight of the composition. In one embodiment, the method for preparing the cosmetic composition for blocking ultraviolet rays may further comprise mixing a hydrocarbon oil. The above-mentioned content regarding the cosmetic composition for blocking ultraviolet rays may be similarly applied to the method for preparing the cosmetic composition for blocking ultraviolet rays.

[0022] Furthermore, the present inventors have discovered that by adding a specific amount of polar oil to the cosmetic composition containing the UV blocking agent and preparing the cosmetic composition in an oil-in-water (O / W) formulation, it is possible to adjust the intermolecular distance of methoxycinnamic acid closely, thereby increasing the UV blocking efficiency when exposed to UV rays.

[0023] The present invention provides a cosmetic composition for blocking ultraviolet rays, comprising an ultraviolet ray blocking agent having a methoxycinnamic acid structure and a polar oil, the ultraviolet ray blocking agent being isoamyl paramethoxycinnamate. The ultraviolet ray blocking agent may further comprise ethylhexyl methoxycinnamate, cinoxate, or a mixture thereof, in addition to isoamyl paramethoxycinnamate. The ultraviolet ray blocking agent having a methoxycinnamic acid structure may be contained in an amount of 2 to 30% by weight, preferably 2 to 25% by weight, more preferably 2 to 20% by weight, based on the total weight of the composition. When the ultraviolet ray blocking agent having a methoxycinnamic acid structure is contained in an amount of less than 2% by weight based on the total weight of the composition of the present invention, the SPF may be reduced by ultraviolet rays, and when it exceeds 30% by weight, the stability of the cosmetic formulation may be impaired.

[0024] In one embodiment, the isoamyl paramethoxycinnamate may be contained in an amount of 2 to 30 wt %, preferably 2 to 25 wt %, and more preferably 2 to 20 wt %, based on the total weight of the composition. If the isoamyl paramethoxycinnamate is contained in an amount of less than 2 wt %, the SPF may be reduced by ultraviolet rays, and if it is contained in an amount of more than 30 wt %, the stability of the cosmetic formulation may be impaired.

[0025] In one embodiment, the polar oil may be an ester oil or triglyceride, and the UV blocking agent having a methoxycinnamic acid structure may be excluded. Specifically, the polar oil may include, but is not limited to, any one or more selected from the group consisting of cetyl ethylhexanoate, (caprylic / capric acid) glycerides, phenethyl benzoate, dicaprylyl carbonate, C12-15 alkyl benzoate, octocrylene, and phenyl trimethicone.

[0026] In one embodiment, the content of the polar oil may be equal to or less than the content of the isoamyl paramethoxycinnamate. Alternatively, the content of the polar oil may be 0.01 to 30 wt%, preferably 0.01 to 25 wt%, more preferably 0.01 to 20 wt%, based on the total weight of the composition. Alternatively, the polar oil may not be contained at all in the UV blocking cosmetic composition of the present invention. If the content of the polar oil exceeds the content of the isoamyl paramethoxycinnamate, the effect of increasing the SPF against UV rays is not achieved.

[0027] In one embodiment, the cosmetic composition for blocking ultraviolet rays of the present invention may contain an ultraviolet blocking agent having a methoxycinnamic acid structure and a polar oil in a weight ratio of 1:0.01-0.7, preferably 1:0.01-0.5, more preferably 1:0.01-0.3 (ultraviolet blocking agent having a methoxycinnamic acid structure: polar oil). Alternatively, the cosmetic composition for blocking ultraviolet rays of the present invention may contain isoamyl paramethoxycinnamate and a polar oil in a weight ratio of 1:0.01-0.7, preferably 1:0.01-0.5, more preferably 1:0.01-0.3 (isoamyl paramethoxycinnamate: polar oil). If the weight of the polar oil exceeds the above weight ratio range, the effect of increasing the ultraviolet blocking efficiency by ultraviolet rays is not achieved.

[0028] In one embodiment, the cosmetic composition for blocking ultraviolet rays may further include a non-polar oil, and the non-polar oil may include, for example, a hydrocarbon oil, a silicone oil, or a mixture thereof. When the cosmetic composition for blocking ultraviolet rays includes a hydrocarbon oil, it is possible to improve the ultraviolet ray blocking effect by providing an excellent feeling of application to the skin. The hydrocarbon oil may include, but is not limited to, any one or more selected from the group consisting of isododecane, isohexadecane, mineral oil, hydrogenated polydecene, and squalane. In addition, when the cosmetic composition for blocking ultraviolet rays includes a silicone oil, it is excellent in the effect of increasing the ultraviolet ray blocking efficiency by ultraviolet rays, and is also useful for improving the feeling of use. The silicone oil may be, but is not limited to, any one or more selected from the group consisting of cyclotetrasiloxane, cyclopentasiloxane, cyclohexasiloxane, dimethicone, dimethiconol, and phenyltrimethicone.

[0029] The UV-blocking cosmetic composition of the present invention may contain a non-polar oil in an amount of 20% by weight or less, preferably 15% by weight or less, more preferably 5% by weight or less, and even more preferably 3% by weight or less, based on the total weight of the composition. The non-polar oil may be contained in an amount of 0.01 to 20% by weight, preferably 5.0 to 20% by weight, or 5.1 to 20% by weight, based on the total weight of the composition. Preferably, the non-polar oil may be contained in an amount of 0.01 to 10% by weight, more preferably 5.0 to 10% by weight, or 5.1 to 10% by weight, based on the total weight of the composition. If the non-polar oil is contained in an amount of less than 0.01% by weight, based on the total weight of the composition, the feel of use may be too hard to meet the basic quality standards for cosmetics, and if it exceeds 20% by weight, the stability of the formulation may be impaired.

[0030] In one embodiment, the cosmetic composition for blocking ultraviolet rays of the present invention may be in the form of an emulsion, preferably in the form of an oil-in-water (O / W) formulation. When the cosmetic composition for blocking ultraviolet rays of the present invention is prepared in the form of an oil-in-water formulation containing the specific content of polar oil as described above, the effect of increasing the ultraviolet ray blocking efficiency after irradiation with ultraviolet rays is significantly excellent.

[0031] In one embodiment, the present invention provides an oil-in-water type ultraviolet blocking cosmetic composition comprising an ultraviolet blocking agent having a methoxycinnamic acid structure and a polar oil, the ultraviolet blocking agent comprising isoamyl paramethoxycinnamate, the ultraviolet blocking agent being 2 to 30% by weight based on the total weight of the composition, and the content of the polar oil being equal to or less than the content of isoamyl paramethoxycinnamate. After irradiation with ultraviolet light, the ultraviolet blocking effect of the composition is significantly increased, and the use sensation of the cosmetic composition is also significantly excellent.

[0032] The cosmetic composition for blocking ultraviolet rays of the present invention has an SPF value that increases significantly after ultraviolet irradiation, specifically, the SPF value can increase by 3 to 80%, preferably by 5 to 77%, compared to before ultraviolet irradiation. After ultraviolet irradiation, the cosmetic composition for blocking ultraviolet rays of the present invention has an increased blocking effect against UV-A (320 to 400 nm) and UV-B (280 to 320 nm), preferably a significantly increased blocking effect against UV-B.

[0033] The present invention provides a method for preparing a cosmetic composition for blocking ultraviolet rays, comprising mixing an ultraviolet ray blocking agent having a methoxycinnamic acid structure with a polar oil, the ultraviolet ray blocking agent comprising isoamyl paramethoxycinnamate, and the polar oil content being equal to or less than the content of isoamyl paramethoxycinnamate. The above-mentioned content regarding the cosmetic composition for blocking ultraviolet rays can be similarly applied to the preparation method. Effect of the Invention

[0034] The cosmetic composition for blocking ultraviolet rays of the present invention significantly increases the ultraviolet ray blocking efficiency, particularly the blocking effect against UV-A (320 to 400 nm) and UV-B (280 to 320 nm), when exposed to ultraviolet rays. In addition, the cosmetic composition for blocking ultraviolet rays of the present invention contains a specific amount of hydrocarbon oil, and therefore has a significantly excellent feeling when used. [Brief description of the drawings]

[0035] [Figure 1] 13 is a result showing an increase rate of ultraviolet ray blocking in one example (Example 8) of the present invention. [Diagram 2] 1 shows the results of absorbance change before and after ultraviolet light irradiation in one example (Example 8) of the present invention. [Diagram 3] 1 shows the results of absorbance change before and after ultraviolet light irradiation in one example (Example 13) of the present invention. [Figure 4] 13 shows the change in absorbance before and after ultraviolet irradiation in Comparative Example 11. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0036] Hereinafter, the present invention will be described in detail with reference to examples to aid in understanding the present invention. However, the examples according to the present invention may be modified in various ways, 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.

[0037] Experimental example 1: UV blocking effect before and after UV irradiation The five representative UV blocking agents shown in Table 1 below were applied to a PMMA plate (HelioScreen Labs, HD6) at a concentration of 1.3 mg / cm. 2 The in vitro SPF was measured using an SPF-290S (Optomertrics Corporation) before and after irradiation with 2MED (Minimal Erythema Dose) using an ultraviolet irradiator (Solar Simulator 16S, Solar Light Company). The in vitro SPF was measured at six different points on the PMMA plate and the average value was used. The results are shown in Table 1 below.

[0038] [Table 1]

[0039] As a result, OMC or IMC, which have a methoxycinnamic acid structure, increased the in vitro SPF value, while other UV blockers did not show any significant change.

[0040] Experimental Example 2: UV protection effect depending on OMC and IMC content UV protection cosmetics were prepared with the contents in Table 2 below. Components A and B were prepared and heated to 75°C. Component B was slowly added to component A and emulsified using a homomixer for 5 minutes, then cooled to 30°C. The SPF value of each sample prepared before and after UV exposure was measured using the same method as in Experimental Example 1, and the results are shown in Table 3 below.

[0041] [Table 2]

[0042] [Table 3]

[0043] Experimental Example 3: UV protection effect depending on silicone oil content Samples having the compositions shown in Table 4 were prepared using the method described above. The in vitro SPF of each sample was measured before and after UV exposure using the same method, and the values ​​before and after UV exposure were compared, as shown in Table 5 below.

[0044] [Table 4]

[0045] [Table 5]

[0046] An experiment was conducted to investigate the effect of the present invention depending on the content of silicone oil. The effect of the present invention was maintained even when the content of silicone oil was increased as in Comparative Examples 2 to 5. However, the compatibility of silicone oil with OMC and IMC was poor, so the stability was somewhat reduced.

[0047] Experimental Example 4: UV blocking effect depending on the content of hydrocarbon oil Samples having the compositions shown in Table 6 were prepared using the method described above. The in vitro SPF of each sample was measured before and after UV irradiation using the same method, and the values ​​before and after UV irradiation were compared and are shown in Table 7 below. [Table 6]

[0048] [Table 7]

[0049] Experiments were conducted to investigate the effect of the invention depending on the type and content of hydrocarbon oil. Looking at the experimental results of Comparative Examples 6 to 9 and Examples 9 to 12, the SPF increasing effect of the present invention was excellent regardless of the type and content of hydrocarbon oil. However, in the cases of Comparative Examples 6 to 9, where the content of hydrocarbon oil was less than 5%, the texture was too hard when used and did not meet the basic quality standards for cosmetics. In the cases of Examples 9 to 12, where the content of hydrocarbon oil was 5% or more, the SPF increasing effect was significantly excellent and the application comfort on the skin was also significantly excellent.

[0050] The change in absorbance in the ultraviolet region before and after ultraviolet irradiation in Example 8 is shown in FIG. 2. The absorbance was measured using SPF-290S (Optomertrics Corporation) to measure the in vitro SPF. The absorbance before ultraviolet irradiation in Example 8 is shown by a solid line, and the absorbance after ultraviolet irradiation is shown by a dotted line. As shown in FIG. 2, it was confirmed that the absorbance in the entire ultraviolet region increases with ultraviolet irradiation in Example 8. It can be assumed that the increase in SPF value after ultraviolet irradiation is due to a significant increase in absorbance in the UV-A (320-400 nm) and UV-B (280-320 nm) regions, especially the UV-B region.

[0051] Experimental Example 5: UV blocking effect depending on polar oil content Samples having the compositions shown in Table 8 were prepared using the method described above. The in vitro SPF of each sample was measured before and after UV irradiation using the same method, and the values ​​before and after UV irradiation were compared and shown in Table 9 below.

[0052] [Table 8]

[0053] [Table 9]

[0054] An experiment was conducted to investigate the effect of the invention depending on the type and content of polar oil. When the polar oil content was 5% or less, the UV blocking effect increased significantly as in Examples 13 and 14. However, when the polar oil content was 5% or more, no increase in the UV blocking efficiency was observed as in Comparative Examples 10 to 13.

[0055] 3 shows a graph of absorbance before and after ultraviolet irradiation in Example 13. From the absorbance graph, it was confirmed that the ultraviolet blocking efficiency increased over the entire ultraviolet range.

[0056] A graph of absorbance before and after ultraviolet irradiation in Comparative Example 11 is shown in Figure 4. Looking at the change in absorbance in Comparative Example 11 shown in Figure 4, it can be seen that there is almost no change in absorbance due to ultraviolet rays, and instead, there is a slight decrease in absorbance in the UV-B region.

[0057] Experimental Example 6: UV blocking effect depending on the type and content of polar oil Samples having the compositions shown in Table 10 below were prepared using the method described above. The in vitro SPF of each sample was measured before and after UV exposure using the same method, and the values ​​before and after UV exposure were compared, as shown in Table 11 below.

[0058] [Table 10]

[0059] [Table 11]

[0060] Experiments were conducted to investigate the UV blocking effect of various polar oil types and contents. When the polar oil content was 5% or less, the UV blocking effect increased significantly before and after UV irradiation as in Examples 15 to 19. However, when the polar oil content exceeded 5%, no increase in the UV blocking effect was observed as in Comparative Examples 14 to 18.

[0061] Experimental Example 7: UV protection effect of different oils in oil-in-water systems A UV protection cosmetic having the composition shown in Table 12 below was prepared as follows. The raw materials in section A were thoroughly mixed at 75°C. Raw material 11 was added to raw material 10 and dispersed using a disperser for 30 minutes. The remaining raw materials in section B were added and heated to 75°C. Item A was slowly added to item B while emulsifying using a homomixer for 10 minutes and cooled to 30°C.

[0062] [Table 12]

[0063] The SPF value of each sample was measured before and after exposure to ultraviolet rays in the same manner as in Experimental Example 1, and the results are summarized in Table 13 below.

[0064] [Table 13]

[0065] In Example 20, which did not contain oil, and Examples 21 to 23, which contained non-polar oil, the in vitro SPF value increased due to UV light. However, in Comparative Examples 19 and 20, which contained 10 wt% polar oil, the in vitro SPF value decreased due to UV light. From these results, it was confirmed that, unlike non-polar oil, the content of polar oil needs to be limited in order for the UV blocking cosmetic composition of the present invention to exhibit excellent UV blocking effect.

[0066] Experimental Example 8: UV blocking effect of OMC and IMC oils in oil-in-water systems UV protection cosmetics having the compositions shown in Tables 14 and 15 below were prepared as follows. Raw materials A were thoroughly mixed at 75°C. Raw material 7 was added to raw material 6 and dispersed using a disperser for 30 minutes. The remaining raw materials B were added and heated to 75°C. Item A was slowly added to item B and emulsified using a homomixer for 10 minutes, then cooled to 30°C.

[0067] [Table 14]

[0068] [Table 15]

[0069] Each sample was applied to a PMMA plate (HelioScreen Labs, HD6) at 1.3 mg / cm 2 The in vitro SPF values ​​before and after 2 MED of irradiation with 321 nm light using a laboratory UV irradiation device, bio-sun (Vilber Lourmat), are shown in Tables 16 and 17. The in vitro SPF was calculated using the following formula using the absorbance measured with a spectrophotometer (Epoch). The absorbance was measured at nine different points on the PMMA plate, and the average SPF value calculated from each absorbance was used.

[0070]

number

[0071] [Table 16]

[0072] [Table 17]

[0073] In Comparative Examples 21 to 23, where OMC was used alone, even a small amount of polar oil reduced the SPF value after UV exposure, and the effects of the present invention were not achieved. In Examples 25 to 30, where OMC was additionally containing a non-polar oil, it was confirmed that the UV blocking efficiency increased. In Examples 32 to 34, where IMC was used alone, the negative effects of the polar oil were significantly reduced. In Examples 35 to 40, where IMC was additionally containing a non-polar oil, it was confirmed that the UV blocking efficiency increased due to UV rays.

[0074] Experimental Example 9: UV blocking effect of IMC and polar oil in oil-in-water system UV protection cosmetics having the compositions shown in Tables 18 and 19 below were prepared as follows. Raw materials A were thoroughly mixed at 75°C. Raw material 7 was added to raw material 6 and dispersed using a disperser for 30 minutes, and raw material 8 was then added and heated to 75°C. Item A was slowly added to item B and emulsified using a homomixer for 10 minutes, then cooled to 30°C.

[0075] [Table 18]

[0076] [Table 19]

[0077] Each sample was applied to a PMMA plate (HelioScreen Labs, HD6) at 1.3 mg / cm 2The in vitro SPF values ​​before and after 2 MED irradiation using a suntest XLS+ (solar simulator) are shown in Table 20 below. The in vitro SPF was calculated using the absorbance measured with a spectrophotometer (Epoch) according to the following formula. The absorbance was measured at nine different points on a PMMA plate, and the average SPF value calculated from each absorbance was used.

[0078]

number

[0079] [Table 20]

[0080] When the polar oil content was equal to or less than the IMC content as in Examples 41 to 46, the in vitro SPF value increased due to UV rays. On the other hand, when the polar oil content was greater than the IMC content as in Comparative Examples 24 to 33, the in vitro SPF value decreased due to UV rays or the rate of change was significantly lower. Therefore, it was confirmed that in order for the UV blocking cosmetic composition of the present invention to exhibit excellent UV blocking effect, the polar oil content must be equal to or less than the UV blocking agent, especially the IMC content.

[0081] Experimental Example 10: UV blocking effect depending on non-polar oil content UV protection cosmetics were prepared with the contents in Table 21 below. Components A and B were prepared and heated to 75°C. Component B was slowly added to component A and emulsified for 5 minutes using a homomixer, then cooled to 30°C. The SPF value of each sample prepared before and after UV exposure was measured in the same manner as in Experimental Example 1, and the results are shown in Table 22 below.

[0082] [Table 21]

[0083] [Table 22]

[0084] As in Examples 47 to 50, it was confirmed that even when non-polar oil was included up to 20%, the UV blocking efficiency increased due to UV rays.

[0085] Experimental Example 11: UV protection effect depending on OMC and IMC content UV protection cosmetics were prepared with the contents in Table 23 below. Components A and B were prepared and heated to 75°C. Component B was slowly added to component A and emulsified for 5 minutes using a homomixer, then cooled to 30°C. The SPF value of each sample prepared before and after UV exposure was measured in the same manner as in Experimental Example 1, and the results are shown in Table 24 below.

[0086] [Table 23]

[0087] [Table 24]

[0088] It was confirmed that when the amount of polar oil contained is less than the IMC content, as in Examples 51 to 53, the effect of the present invention is maintained, and when the amount of polar oil contained is greater than the IMC content, as in Comparative Examples 34 and 35, the effect of the present invention is not achieved.

[0089] Experimental Example 12: UV blocking effect of emulsifier UV protection cosmetics were prepared with reference to Tables 25 and 26 below. Item A and Item B were prepared and heated to 75°C. Item B was slowly added to Item A while emulsifying for 5 minutes using a homomixer, and then cooled to 30°C. The SPF value of each sample prepared before and after UV exposure was measured in the same manner as in Experimental Example 1, and the results are shown in Table 27 below.

[0090] [Table 25]

[0091] [Table 26]

[0092] [Table 27]

[0093] It was confirmed that the effects of the present invention are maintained even when an emulsifier suitable for oil-in-water emulsions is included.

[0094] Experimental Example 13: UV blocking effect of polymers UV protection cosmetics were prepared with reference to Tables 28 and 29 below. Item A and Item B were prepared and heated to 75°C. Item B was slowly added to Item A while emulsifying for 5 minutes using a homomixer, and then cooled to 30°C. The SPF value of each sample prepared before and after UV exposure was measured in the same manner as in Experimental Example 1, and the results are shown in Table 30 below.

[0095] [Table 28]

[0096] [Table 29]

[0097] [Table 30]

[0098] It was confirmed that the effect of the present invention is maintained even when a thickener used in oil-in-water compositions is used.

[0099] Experimental Example 14: UV protection effect of different emulsifiers in oil-in-water emulsions The types of emulsifiers shown in Table 32 were mixed with the compositions in Table 31 below to prepare UV protection cosmetics as follows. Raw materials A were thoroughly mixed at 75°C. Raw materials 7 and 8 were added to raw material 6 and dispersed using a disperser for 30 minutes, and then the remaining raw materials in B were added and heated to 75°C. Item A was slowly added to item B and emulsified using a homomixer for 10 minutes, then cooled to 30°C. The SPF values ​​of each sample prepared before and after UV exposure were measured using the same method as in Experimental Example 1, and the results are shown in Table 33 below.

[0100] [Table 31]

[0101] [Table 32]

[0102] [Table 33]

[0103] It was confirmed that the emulsifiers used in Examples 72 to 79 significantly increased the UV blocking effect, but the emulsifier used in Comparative Example 36 was unable to increase the UV blocking effect.

Claims

1. The composition comprises an ultraviolet blocking agent having a methoxycinnamic acid structure and a polar oil in an amount of 0.01 to 5% by weight based on the total weight of the composition, The polar oil is at least one selected from the group consisting of cetyl ethylhexanoate, caprylic / capric glycerides, phenethyl benzoate, dicaprylyl carbonate, C12-15 alkyl benzoate, and octocrylene; The ultraviolet blocking agent having a methoxycinnamic acid structure and the polar oil are contained in a weight ratio of 1:0.01 to 0.4 (ultraviolet blocking agent having a methoxycinnamic acid structure:polar oil), Further comprising a hydrocarbon oil, The UV blocking agent having a methoxycinnamic acid structure is at least one selected from the group consisting of ethylhexyl methoxycinnamate, isoamyl p-methoxycinnamate, and cinoxate; The UV blocking agent having a methoxycinnamic acid structure is included in an amount of 2 to 30% by weight based on the total weight of the composition, The hydrocarbon oil is contained in an amount of 5 to 30% by weight based on the total weight of the composition, The cosmetic composition for blocking ultraviolet rays comprises the ultraviolet ray blocking agent having a methoxycinnamic acid structure and a hydrocarbon oil in a weight ratio of 1:0.5 to 0.93 (ultraviolet ray blocking agent having a methoxycinnamic acid structure:hydrocarbon oil).

2. 2. The cosmetic composition for blocking ultraviolet light according to claim 1, wherein the composition contains a polar oil and a hydrocarbon oil in a weight ratio of 1:1 to 300 (polar oil:hydrocarbon oil).

3. 2. The cosmetic composition for blocking ultraviolet rays according to claim 1, wherein the hydrocarbon oil comprises at least one selected from the group consisting of liquid paraffin, light liquid isoparaffin, heavy liquid isoparaffin, petrolatum, n-paraffin, mineral oil, isoparaffin, isododecane, isohexadecane, polyisobutylene, hydrogenated polyisobutylene, polybutene, ozokerite, ceresin, microcrystalline wax, paraffin wax, polyethylene wax, polyethylene / polypropylene wax, squalane, squalene, pristane, and polyisoprene.

4. The cosmetic composition for blocking ultraviolet light according to claim 1 , further comprising a silicone oil.

5. The cosmetic composition for blocking ultraviolet rays according to claim 1 , wherein the SPF value of the composition is increased after exposure to ultraviolet rays compared to before exposure.

6. 2. The cosmetic composition for blocking ultraviolet rays according to claim 1, wherein the composition has an increased blocking effect against UV-A and UV-B rays after exposure to ultraviolet rays.

7. The method includes mixing an ultraviolet blocking agent having a methoxycinnamic acid structure with a polar oil in an amount of 0.01 to 5% by weight based on the total weight of the composition, further comprising the step of mixing a hydrocarbon oil; The ultraviolet blocking agent having a methoxycinnamic acid structure and the polar oil are contained in a weight ratio of 1:0.01 to 0.4 (ultraviolet blocking agent having a methoxycinnamic acid structure:polar oil), The UV blocking agent having a methoxycinnamic acid structure is at least one selected from the group consisting of ethylhexyl methoxycinnamate, isoamyl p-methoxycinnamate, and cinoxate; The polar oil is at least one selected from the group consisting of cetyl ethylhexanoate, caprylic / capric glycerides, phenethyl benzoate, dicaprylyl carbonate, C12-15 alkyl benzoate, and octocrylene; The method for producing an ultraviolet blocking cosmetic composition contains the ultraviolet blocking agent having a methoxycinnamic acid structure and a hydrocarbon oil in a weight ratio of 1:0.5 to 0.93 (ultraviolet blocking agent having a methoxycinnamic acid structure:hydrocarbon oil).

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