Method for improving ultraviolet blocking efficiency and cosmetic manufacturing use

Abstract

The present invention relates to a method for improving the UV blocking efficiency and a cosmetic manufacturing use, which uses a composition comprising a combination of (a) a polymer having self-emulsifying ability and (b) a polyol having an IOB value of 5.0 or less, wherein the above composition includes an aqueous phase portion and an oily phase portion, (a) the polymer having self-emulsifying ability and (b) the polyol having an IOB value of 5.0 or less are contained in the above aqueous phase portion, a UV blocking agent is contained in the above oily phase portion, wherein the above composition does not contain an oily phase thickening agent, the viscosity of the above oily phase portion is 1,000 cps or less. Generally, the UV blocking efficiency of a UV blocking agent decreases due to heat, but according to the present invention, a remarkable effect of improving the UV blocking efficiency of a UV blocking agent by heat can be obtained.

Description

[0001] This application is a divisional application. The original application has the application number 202180037957.1, the application date is May 24, 2021, and the invention title is "Cosmetic composition for improving ultraviolet blocking efficiency by heat and ultraviolet light". Technical Field

[0002] This application claims priority based on Korean Application No. 10-2020-0067122, filed on June 3, 2020, and Korean Application No. 10-2020-0166725, filed on December 2, 2020, the contents of the descriptions and drawings of these applications are incorporated herein by reference.

[0003] This invention relates to methods, compositions, uses, or applications for improving the ultraviolet blocking efficiency of ultraviolet blocking agents by means of heat. Background Technology

[0004] Ultraviolet (UV) radiation from sunlight is a major cause of skin rashes, swelling, freckles, and skin cancer. Numerous studies on various skin diseases caused by UV radiation are currently underway. Generally, based on wavelength, UV radiation is classified as UV-C (200–280 nm), UV-B (280–320 nm), or UV-A (320–400 nm). UV-C passes through the ozone layer but is eliminated before reaching the Earth's surface, while UV-B penetrates the epidermis, causing rashes, freckles, or swelling. As is well known, UV-A penetrates the dermis, causing skin cancer, wrinkles, promoting melanin formation and other signs of skin aging, and causing skin irritation. Multiple biomechanical studies have demonstrated a strong link between sun exposure and human skin cancer.

[0005] As a result of the aforementioned dangers associated with excessive sun exposure, the general public is increasingly concerned about UV-blocking products, leading to the emergence of UV-blocking products with various SPF (Sun Protection Factor) ratings. To achieve high SPF values, UV-blocking products utilize inorganic UV-blocking agents such as titanium dioxide or zinc oxide, or organic UV-blocking agents such as ethylhexyl methoxycinnamate, hexyl salicylate, octocrylene, butyl methoxydibenzoylmethane, bis-ethylhexyloxyphenol methoxyphenyl triazine, or hexyl diethylaminohydroxybenzoylbenzoate.

[0006] On the other hand, UV blockers applied to the skin have encountered problems where they fail to function due to moisture damage to the blocking film and decreased photostability based on UV radiation. In particular, it is well known that ethylhexyl methoxycinnamate, isoamyl methoxycinnamate, or cinnoxalate, which are UV blockers with a methoxycinnamate structure, suffer from reduced efficiency in absorbing UV light due to the conversion of their trans isomer to cis isomer by UV radiation.

[0007] Recently, technologies have been developed to address the problem of reduced UV blocking efficiency, but these mainly involve technologies that address the reduction in UV blocking efficiency caused by moisture and / or light. Research on improving the reduction in UV blocking efficiency caused by heat is still limited.

[0008] As summer temperatures rise each year, there is a need for corresponding UV blockers. If UV blocking efficiency decreases due to heat, it becomes ineffective at blocking UV rays, potentially leading to skin aging or various skin diseases. Furthermore, increased outdoor activity and longer sun exposure can necessitate the inconvenience of repeatedly reapplying UV-blocking cosmetics. To address these issues, there is a need to develop methods to prevent the effectiveness of UV blockers from decreasing due to heat, or methods to further enhance their effectiveness even when using the same amount.

[0009] Throughout this specification, references are made to several documents, and their referenced portions are shown. The disclosures in the cited documents are incorporated herein by reference in their entirety to further clearly illustrate the level of the technical field to which this invention pertains and the content of this invention. Summary of the Invention

[0010] Technical issues

[0011] The inventors of this invention, through diligent research to solve the problems in the prior art, discovered a surprising phenomenon: when using a combination of a polymer with self-emulsifying ability and a polyol with an IOB value below 5.0, the UV blocking efficiency of the UV blocker actually increases upon heating, thus completing this invention.

[0012] Therefore, the object of the present invention is to provide the following application examples.

[0013] Application Example 1. A method for improving the UV blocking efficiency of a UV blocker by heat using a combination of (a) a polymer with self-emulsifying ability and (b) a polyol with an IOB value of less than 5.0.

[0014] Application Example 2. In Application Example 1, the method is characterized by comprising: preparing an aqueous phase comprising a polymer having the self-emulsifying ability and a polyol; preparing an oil phase comprising an ultraviolet blocker; mixing the aqueous phase and the oil phase to produce a mixed composition; and heating the mixed composition.

[0015] Application Example 3. A composition for improving the UV blocking efficiency of a UV blocker by heat, comprising (a) a combination of a self-emulsifying polymer and (b) a polyol with an IOB value of 5.0 or less as an active ingredient; the use of (a) a combination of a self-emulsifying polymer and (b) a polyol with an IOB value of 5.0 or less for improving the UV blocking efficiency of a UV blocker by heat; or the use of (a) a self-emulsifying polymer and (b) a polyol with an IOB value of 5.0 or less in the manufacture of cosmetics for improving blocking efficiency by heat.

[0016] Application Example 4. In any of the above application examples, the method, composition, use or application is characterized in that the active ingredient that plays the role of improving the UV blocking efficiency of the UV blocker by heat is composed of a combination of (a) a polymer with self-emulsifying ability and (b) a polyol with an IOB value of 5.0 or less.

[0017] Application Example 5. In any of the above application examples, the method, composition, use, or application is characterized in that the polymer with self-emulsifying ability is selected from acrylic (ester) / behenol polyoxyethylene ether-25 methacrylate copolymer, sodium acrylate / sodium acryloyl dimethyl taurate copolymer, sodium acrylate / sodium acryloyl dimethyl taurate / dimethylacrylamide crosslinked polymer (Sodium Acrylate / Acryloyldimethyltaurate / Dimethylacrylamide) The group consisting of one or more of the following: crosspolymer, sodium polyacrylate, acrylate / C10-30 alkanol acrylate crosspolymer, acrylate / behenol polyether-25 methacrylate copolymer, acrylate copolymer, ammonium acryloyl dimethyl taurate / behenol polyether-25 methacrylate crosspolymer, ammonium acryloyl dimethyl taurate / VP copolymer, polyacrylate-13, polyacrylate crosspolymer-6, polyacrylamide, PEG-240 / HDI copolymer bis-decyltetradecyl alcohol polyether-20 ether, and hydroxyethyl acrylate / sodium acryloyl dimethyl taurate copolymer.

[0018] Application Example 6. In any of the above application examples, the method, composition, use, or application is characterized in that the polyol with an IOB value of 5.0 or less is selected from one or more of the group consisting of glycerol, sorbitol, xylitol, glucose, trehalose, diglycerol, propylene glycol, 1,2-propylene glycol, polyglycerol-3, methylpropylene glycol, butylene glycol, pentanediol, PEG-6, PEG-8, glycerol polyether-26, dipropylene glycol, 1,2-hexanediol, and ethylene glycol octanoate.

[0019] Application Example 7. In any of the above application examples, the method, composition, use, or application is characterized in that the ultraviolet blocking agent is selected from one or more compounds formed from aminobenzoic acid, benzophenone, cinnamate, salicylate, inorganic metal oxides, butylmethoxydibenzoylmethane, terephthalylidenedicamphorsulfonic acid, phenylbenzimidazole sulfonicacid, bemotrizinol, and bisoctrizole.

[0020] Application Example 8. In any of the above application examples, the method, composition, use, or application is characterized in that the polymer with self-emulsifying ability is an aqueous thickener.

[0021] Application Example 9. In any of the above application examples, the method, composition, use or application is characterized in that the composition comprises an aqueous phase and an oil phase, (a) a polymer having self-emulsifying ability and (b) a polyol with an IOB value of 5.0 or less are contained in the aqueous phase, and the ultraviolet blocking agent is contained in the oil phase.

[0022] Application Example 10. In any of the above application examples, the method, composition, use, or application is characterized in that, when the composition is irradiated with ultraviolet light, the heat further increases the ultraviolet blocking efficiency of the ultraviolet blocker.

[0023] Application Example 11. A cosmetic comprising a composition according to any one of the above application examples.

[0024] Other objects and advantages of the present invention will become clearer from the following detailed description of the invention, the claims, and the accompanying drawings.

[0025] Technical solutions

[0026] One aspect of the present invention is to provide a method for improving the UV blocking efficiency of a UV blocker by using a combination of (a) a polymer with self-emulsifying ability and (b) a polyol with an IOB value below 5.0.

[0027] The above method may include: preparing an aqueous phase comprising the above-mentioned self-emulsifying polymer and polyol; preparing an oil phase comprising the above-mentioned ultraviolet blocker; mixing the above-mentioned aqueous phase and oil phase to produce a mixed composition; and heating the above-mentioned mixed composition.

[0028] Another aspect of the present invention is to provide a composition for improving the UV blocking efficiency of a UV blocker by heat, comprising (a) a polymer having self-emulsifying ability and (b) a combination of a polyol with an IOB value of less than 5.0 as an active ingredient.

[0029] Polymers with self-emulsifying ability

[0030] The self-emulsifying polymer (SEP) of this invention refers to a polymer that simultaneously possesses hydrophilic and hydrophobic groups within its chain, thereby exhibiting both thickening and emulsifying capabilities. When using a self-emulsifying polymer to manufacture an emulsified composition, a stable composition can be produced without other emulsifiers. Furthermore, upon heating after application, the UV blocker can diffuse within the film, ultimately achieving a uniform expansion of the UV-blocking region through heat, thus enhancing its effectiveness. Conversely, in conventional emulsification, even with heating, the emulsifier at the interface hinders the movement of the UV blocker, and the blocking effect remains unchanged before and after heating. Figure 1 The principle of improving UV blocking effect through emulsification of the polymer of the present invention compared to such general emulsification is briefly illustrated.

[0031] Examples of polymers with self-emulsifying capabilities include acrylate / behenol polyoxyethylene ether-25 methacrylate copolymers, sodium acrylate / sodium acryloyl dimethyl taurate copolymers, sodium acrylate / sodium acryloyl dimethyl taurate / dimethacrylamide crosspolymers, sodium polyacrylate, acrylate / C10-30 alkanol acrylate crosspolymers, acrylate / behenol polyether-25 methacrylate copolymers, acrylate copolymers, ammonium acryloyl dimethyl taurate / behenol polyether-25 methacrylate crosspolymers, ammonium acryloyl dimethyl taurate / VP copolymers, polyacrylate-13, polyacrylate crosspolymer-6, polyacrylamide, PEG-240 / HDI copolymer bis-decyltetradecyl alcohol polyether-20 ether, hydroxyethyl acrylate / sodium acryloyl dimethyl taurate copolymers, etc., but are not limited to these.

[0032] In the compositions of the present invention, the self-emulsifying polymer described above may be contained in quantities from 0.01% to 10% by weight.

[0033] Polyols with an IOB value below 5.0

[0034] The IOB (inorganic-organic balance) value is a numerical value that represents the hydrophilicity of an organic compound. The higher the value, the higher the hydrophilicity. The IOB value can be calculated based on the organic and inorganic value tables recorded in "Organic Concept Map - Basics and Applications" (by Yoshiyo Koda, published by Mangosteen Publishing, 1984), etc., to calculate the organic value (OV) and inorganic value (IV), and then calculate the IOB value = (inorganic value / organic value).

[0035] In the case of polyols, even after the water evaporates following application, some residue remains in the pores of the aqueous phase. Heating allows the UV blocker to diffuse into these pores due to the compatibility of the oil phase containing the polyol and the UV blocker, resulting in uniform diffusion of the UV-blocking area and thus increased UV-blocking efficiency. To facilitate this diffusion, preferably, the viscosity of the oil phase of the composition according to the invention is below 1,000 cps, more preferably below 500 cps (measurement conditions: Brookfield viscometer, 40°C, LVF spindle #1, 30 rpm, 1 min). Furthermore, preferably, the viscosity of the oil component in the oil phase is below 1,000 cps, more preferably below 500 cps (measurement conditions: Brookfield viscometer, 40°C, LVF spindle #1, 30 rpm, 1 min).

[0036] Table 1 below lists the IOB values ​​of ethanol and commonly used polyols.

[0037] Table 1

[0038] Raw material name OV IV IOB glycerin 60 300 5.00 Sorbitol 120 600 5.00 Xylitol 100 500 5.00 glucose 120 530 4.42 Trehalose 240 880 3.67 Diglycerides 120 420 3.50 Propylene glycol 60 200 3.33 Polyglycerol-3 180 540 3.00 Methylpropanediol 70 200 2.86 ethanol 40 100 2.50 Butylene glycol 80 200 2.50 PEG-6 240 575 2.40 PEG-8 320 725 2.27 Glyceryl polyether-26 180 360 2.00 dipropylene glycol 120 220 1.83 1,2-Hexanediol 120 200 1.67

[0039] The polyols with an IOB value of 5.0 or less used in this invention may be, for example, selected from one or more of the group consisting of glycerol, sorbitol, xylitol, glucose, trehalose, diglycerol, propylene glycol, 1,2-propylene glycol, polyglycerol-3, methylpropylene glycol, butylene glycol, pentanediol, PEG-6, PEG-8, glycerol polyether-26, dipropylene glycol, 1,2-hexanediol, and ethylene glycol octanoate, but are not limited thereto.

[0040] The polyols with an IOB value of 5.0 or less may be contained in the compositions of the present invention from 0.1% to 50% by weight.

[0041] UV blocking agent

[0042] As ultraviolet (UV) blocking agents, organic UV blocking agents with UV absorption effects and inorganic UV blocking agents with scattering effects can generally be used regardless of their type.

[0043] The aforementioned ultraviolet blocking agents may be selected from one or more compounds in the group consisting of aminobenzoic acid, benzophenone, cinnamate, salicylate, inorganic metal oxides, butylmethoxydibenzoylmethane, terephthalylidenedicamphorsulfonic acid, phenylbenzimidazole sulfonicacid, bemotrizinol, and bisoctrizole, but are not limited thereto.

[0044] Examples of the aforementioned aminobenzoic acid compounds include PABA, PABA glyceryl hexyl ester, Padimate O, and Roxadimate. Examples of the aforementioned benzophenone compounds include Dioxybenzone, Hydroxybenzozazole, and Sulisonbenzone. Examples of the aforementioned cinnamate compounds include Octocrylene, Octylmethoxycinnamate (octinoxate), and Ethoxyethyl p-methoxycinnamate (cinoxate). Examples of the aforementioned salicylate compounds include Homomenthyl salicylate (homosalate), Ethylhexyl salicylate (octyl salicylate / octisalate), and Trolamine salicylate. The inorganic metal oxides mentioned above include titanium dioxide or zinc oxide, but are not limited to these.

[0045] The aforementioned ultraviolet blocking agent may be contained in the composition of the present invention from 0.5% to 30% by weight.

[0046] On the other hand, according to an application example of the present invention, the active ingredient that plays the role of improving the UV blocking efficiency of the UV blocker by heat can be composed of a combination of (a) a polymer with self-emulsifying ability and (b) a polyol with an IOB value of 5.0 or less.

[0047] In other applications of the present invention, the composition of the present invention for improving the ultraviolet blocking efficiency of an ultraviolet blocker by heat may include an aqueous phase and an oil phase, wherein the polymer having self-emulsifying ability is an aqueous thickener and is contained in the aqueous phase together with a polyol having an IOB value of 5.0 or less, and the ultraviolet blocker may be contained in the oil phase.

[0048] In another application example, the composition of the present invention for improving the UV blocking efficiency of a UV blocker by heat may substantially be free of oil-phase thickeners such as dextrin palmitate, lithium distearate dimethylammonium montmorillonite, stearoyl inulin, polyamide-8, glyceryl behenate / eicosyl ester, etc. Here, "substantially free of oil-phase thickeners" means free of oil-phase thickeners, or even if thickeners are present, only in amounts that result in an oil phase viscosity of less than 1,000 cps, more preferably less than 500 cps (measurement conditions: Brookfield viscometer, 40°C, LVF spindle #1, 30 rpm, 1 min). This is to facilitate the diffusion of the composition components into the pores when the aqueous phase evaporates after the composition according to the invention is applied to the skin.

[0049] In another application example, the composition of the present invention for improving the UV blocking efficiency of a UV blocker by heat may not contain any emulsifier components other than the self-emulsifying polymer of the present invention.

[0050] Furthermore, the compositions of the present invention may also contain humectants, thickeners, surfactants, emulsifiers, preservatives, antioxidants, alcohols, fragrances, pH adjusters, or natural extracts, but are not limited thereto. According to the present invention, when such additives are included, it is preferable that the viscosity of the oil phase is below 1,000 cps, more preferably below 500 cps (measurement conditions: Brookfield viscometer, 40°C, LVF spindle #1, 30 rpm, 1 min).

[0051] Generally, the UV blocking efficiency of UV blockers decreases due to heat. However, when using the active ingredients of this invention, namely (a) a polymer with self-emulsifying ability and (b) a polyol with an IOB value of less than 5.0, the UV blocking efficiency of the UV blocker is actually increased by heat.

[0052] The composition of the present invention for improving the UV blocking efficiency of a UV blocker by heat significantly increases the SPF value after applying heat at 40°C for 15 minutes. Specifically, compared with before heating, the increase can be at least 1%, at least 5%, at least 10%, at least 15%, at least 20%, at least 30%, at least 40%, at least 50%, at least 60%, at least 70%, at least 80%, at least 90%, at least 100%, at least 110%, at least 120%, at least 130%, at least 140%, or at least 150%. %, at least 160%, at least 170%, at least 180%, at least 190%, at least 200%, at least 210%, at least 220%, at least 230%, at least 240%, at least 250%, at least 260%, at least 270%, at least 280%, at least 290%, at least 300%, at least 310%, at least 320%, at least 330%, at least 340%, at least 350%, at least 360%, at least 370%, at least 380%, or at least 390%, which can be increased to 400%.

[0053] Furthermore, when ultraviolet irradiation is added in addition to heating, the composition of the present invention exhibits a synergistic effect on the increase of ultraviolet blocking efficiency.

[0054] Another aspect of the present invention is to provide a cosmetic comprising the above-described composition for improving the UV blocking efficiency of a UV blocker by heat.

[0055] The aforementioned cosmetics can be manufactured in all dosage forms commonly manufactured in the art, such as solutions, suspensions, emulsions, pastes, gels, creams, lotions, soaps, cleansers containing surfactants, oils, etc., but are not limited thereto.

[0056] More specifically, the aforementioned cosmetics can be manufactured in the form of sprays, serums, nourishing toners, softening toners, lotions, astringents, skin care waters, moisturizing toners, face creams, foams, foundations, essences, liquid washes, bath salts, sunscreens, sunscreen oils, sunscreen lotions, sunscreen products, makeup products, makeup bases, foundation creams, pressed powders, BB creams, CC creams, face powders, etc., but are not limited to these.

[0057] Preferably, all ingredients described in this invention do not exceed the maximum usage limits specified in relevant regulations and standards of Korea, China, the United States, Europe, Japan, etc. (e.g., regulations on cosmetic safety standards (Korea), cosmetic safety technical specifications (China), etc.). That is, preferably, the cosmetics, cosmetic products, or compositions according to this invention contain the ingredients according to this invention within the content limits permitted by the relevant regulations and standards of each country.

[0058] Invention Effects

[0059] Under normal circumstances, the UV blocking efficiency of UV blockers decreases due to heat, but this invention provides a technique to improve the UV blocking efficiency of UV blockers by using heat. Attached Figure Description

[0060] Figure 1 This is a schematic diagram illustrating the principle of improving the UV blocking effect through polymeric emulsification of the present invention compared to conventional emulsification. In the case of conventional emulsification, even with heating, the emulsifier at the interface hinders the movement of the UV blocker, and the blocking effect remains unchanged before and after heating. However, in polymeric emulsification, the mobility of the UV blocker increases with rising temperature, resulting in greater interfacial fluidity. Therefore, it does not hinder the movement of the UV blocker, thereby expanding the UV blocking area after heating and improving the blocking effect.

[0061] Figure 2 This is a schematic diagram illustrating the effect of polyols with an IOB value of 5.0 or less according to the present invention. When there is no polyol in the aqueous phase, the aqueous phase is completely dried after drying, thus preventing the expansion of the UV blocker during heating. However, when polyol is present in the aqueous phase, polyol remains even after drying. Due to the compatibility between polyol and the UV blocker, the UV blocker can expand into the aqueous phase during heating, resulting in an increase in the blocking effect.

[0062] Figure 3 This is a graph showing the results of evaluating the effects of emulsification of the polymer and general emulsification on the UV blocking effect.

[0063] Figure 4 This is a schematic diagram illustrating the results of evaluating compatibility based on the types of polyols.

[0064] Figure 5 This is a schematic diagram showing the results of calculating the SPF change rate after manufacturing the UV-blocking composition and heating it, in order to confirm the effect of whether or not the emulsifier is included. Detailed Implementation

[0065] The present invention will now be described in further detail through embodiments. These embodiments are only used to illustrate the present invention more specifically, and those skilled in the art should understand that the scope of the present invention is not limited to these embodiments.

[0066] Example

[0067] 1. Comparison of emulsification in polymerization and general emulsification

[0068] To evaluate the effect of emulsification and general emulsification on the UV blocking effect of polymers possessing both thickening and emulsifying capabilities through polymerization using polymers with both hydrophilic and hydrophobic groups within the chain, compositions were prepared as shown in Table 2 below. Each UV blocking composition was coated onto a PMMA plate and dried at room temperature for 15 minutes. The initial in vitro SPF (Sun Protection Factor) was then measured. Subsequently, the later in vitro SPF was measured after heating in a 40°C thermostat for 15 minutes, and the rate of change between the initial and later values ​​was calculated. Figure 3 The results are shown.

[0069] Table 2

[0070]

[0071] Experimental results showed that, compared with general emulsification, the in vitro SPF increase rate was significantly higher when using emulsified compositions polymerized from polymers with self-emulsifying capabilities after heating.

[0072] 2. Confirm the effect of self-emulsifying polymers (SEPs).

[0073] The effects of various self-emulsifying polymers, which possess both thickening and emulsifying capabilities by having both hydrophilic and hydrophobic groups within their chains, on the UV blocking effect were confirmed.

[0074] Specifically, the experimental sample was applied to a PMMA plate (HelioScreen Labs, HD6) at a concentration of 1.3 mg / cm³. 2 After drying at room temperature for 15 minutes, the initial in vitro SPF was measured using an SPF-290AS (Solar Light, USA). In vitro SPF was measured at six different points on the PMMA plate, and the average value was used. The PMMA plate with the initial in vitro SPF measured was then placed on a pre-set 40°C hot plate and heated for 15 minutes. Subsequent in vitro SPF measurements were then taken, and the rate of change between the initial and subsequent values ​​was calculated.

[0075] To confirm the effect of SEP polymers, the thermal-based in vitro SPF numerical change rates of compositions made using non-emulsifying polymers and emulsifiers and 14 compositions made using self-emulsifying polymers were confirmed, and the results are shown in Tables 3 and 4 below.

[0076] Table 3

[0077]

[0078]

[0079] Table 4

[0080]

[0081]

[0082] The experimental results showed that the in vitro SPF value of the general emulsion (Comparative Example 1) did not change before and after heating, but the in vitro SPF value of the composition using SEP increased due to heating.

[0083] Therefore, it can be evaluated that when emulsification is carried out using SEP polymerization, the increased fluidity of the UV blocker due to temperature rise does not hinder the movement of the UV blocker. Instead, the movement of the UV blocker expands the UV blocking area and improves the blocking effect.

[0084] 3. Confirm the impact of polyols with IOB values ​​below 5.0.

[0085] To confirm the effect of polyols, the in vitro SPF change rate before and after heating was measured for compositions that did not contain polyols in the aqueous phase and compositions made using six commonly used polyols with an IOB of less than 5.0, and the results are shown in Table 5 below.

[0086] Table 5

[0087]

[0088] The experimental results showed that the in vitro SPF value of the composition without polyols (Comparative Example 2) decreased significantly upon heating, while the value of the composition containing polyols with an IOB value below 5.0 increased upon heating.

[0089] To confirm the reasons for the increase in values ​​based on the type of polyol, see Table 6 below and Figure 4 The results show that the oil phase, excluding the powder, and the polyol used in Examples 15-21 were mixed at a 1:1 mass ratio, and the degree of separation was visually confirmed the following day. The compatibility was evaluated using a five-point scale.

[0090] Table 6

[0091]

[0092] Experimental results showed that the better the compatibility between the oil phase and the polyol, the higher the in vitro SPF change rate.

[0093] Based on this, it can be confirmed that when polyols containing an IOB value of 5.0 or less are included, due to the compatibility between the polyols remaining in the aqueous phase after application and the UV blocker, the UV blocker can expand into the aqueous phase upon heating, resulting in an increase in the blocking effect.

[0094] 4. Confirm the impact of whether or not emulsifiers are included.

[0095] For emulsified compositions utilizing polymers with self-emulsifying capabilities, to compare their effects with those achieved by adding other emulsifiers, the SPF change rate was calculated after manufacturing and heating the UV-blocking compositions, as shown in Table 7 below. Specifically, each UV-blocking composition was coated onto a PMMA (polymethyl methacrylate) plate, dried for 15 minutes, and then the initial in vitro SPF was measured. Subsequently, the subsequent in vitro SPF was measured after heating in a 40°C constant temperature bath for 15 minutes. The SPF change rate relative to the initial values ​​was calculated and is shown in Table 7 below. Figure 5 The results are shown.

[0096] Table 7

[0097]

[0098]

[0099] According to the emulsified composition based on the polymerization of polymers with self-emulsifying capabilities, the rate of increase decreases with the addition of emulsifiers, but it was found that the in vitro SPF increase rate was very high after heating, compared with general emulsification (Comparative Example 1).

[0100] 5. Confirm the impact of whether or not oil-phase thickener is included.

[0101] The self-emulsifying polymer of the present invention is contained in the aqueous phase as an aqueous thickener. Therefore, it is desirable to use an oil-phase thickener instead of the self-emulsifying polymer of the present invention to manufacture UV-blocking compositions; however, it has been found that this significantly reduces the stability of the formulation. Therefore, the effects of the self-emulsifying polymer of the present invention were compared with those of further containing an oil-phase thickener in the aqueous thickener, and the results are shown in Table 8 below.

[0102] Table 8

[0103]

[0104] Experimental results showed that when various oil-phase thickeners were added to composition 1 (compositions 2 to 6) which only used polymers with self-emulsifying capabilities to manufacture the formulation, the SPF increase rate was significantly reduced.

[0105] 6. Confirm the effects of ultraviolet radiation.

[0106] For the ultraviolet blocking composition (composition 1) of the present invention, Table 9 below shows the temperature-based in vitro SPF change results when exposed to ultraviolet light.

[0107] Specifically, the experimental sample was applied to a PMMA plate (HelioScreen Labs, HD6) at a concentration of 1.3 mg / cm³. 2 After drying at room temperature for 15 minutes, the initial in vitro SPF was measured using an SPF-290AS (Solar Light, USA). The PMMA plate with the initial in vitro SPF measured was then placed on a pre-set hot plate for 15 minutes, after which the subsequent in vitro SPF was measured, and the rate of change between the initial and subsequent values ​​was calculated. Finally, the rate of change in in vitro SPF with and without 2MED ultraviolet irradiation was confirmed using a 16S-300 Solar Light irradiator.

[0108] Table 9

[0109]

[0110] The experimental results showed that the higher the temperature, the higher the rate of change of SPF in vitro, and the increase was more significant when exposed to ultraviolet light.

Claims

1. A method for improving the ultraviolet blocking efficiency of an ultraviolet blocker by heat, wherein, A composition comprising (a) a polymer with self-emulsifying ability and (b) a polyol with an IOB value of less than 5.0 is used. The aforementioned self-emulsifying polymers are selected from one or more of the group consisting of acrylate / behenol polyoxyethylene ether-25 methacrylate copolymer, sodium acrylate / sodium acryloyl dimethyl taurate copolymer, sodium acrylate / sodium acryloyl dimethyl taurate / dimethacrylamide crosslinked polymer, sodium polyacrylate, acrylate / C10-30 alkanol acrylate crosslinked polymer, acrylate / behenol polyether-25 methacrylate copolymer, acrylate copolymer, ammonium acryloyl dimethyl taurate / behenol polyether-25 methacrylate crosslinked polymer, ammonium acryloyl dimethyl taurate / VP copolymer, polyacrylate-13, polyacrylate crosslinked polymer-6, polyacrylamide, PEG-240 / HDI copolymer bis-decyltetradecyl alcohol polyether-20 ether, and hydroxyethyl acrylate / sodium acryloyl dimethyl taurate copolymer. The composition comprises an aqueous phase and an oil phase, wherein (a) a self-emulsifying polymer and (b) a polyol with an IOB value of 5.0 or less are contained in the aqueous phase, and the ultraviolet blocking agent is contained in the oil phase. The above composition does not contain an oil phase thickener, and the viscosity of the oil phase is below 1,000 cps. Among them, the polyols with an IOB value of less than 5.0 in (b) above are selected from one or more of the group consisting of glycerol, sorbitol, xylitol, glucose, trehalose, diglycerol, propylene glycol, polyglycerol-3, methylpropylene glycol, butylene glycol, pentanediol, PEG-6, PEG-8, glycerol polyether-26, dipropylene glycol, 1,2-hexanediol and octanediol.

2. The method according to claim 1, characterized in that, include: The steps include preparing the aqueous phase of the polymer having the above-mentioned self-emulsifying ability and the above-mentioned polyol; The steps for preparing the oil phase containing the aforementioned UV blocker; as well as The step of mixing the above-mentioned aqueous phase and oil phase to manufacture the composition.

3. Use of a composition for manufacturing a cosmetic that improves UV blocking efficiency through heat, said composition comprising: (a) A combination of a polymer with self-emulsifying ability and (b) a polyol with an IOB value below 5.0 as the active ingredient. The aforementioned self-emulsifying polymers are selected from one or more of the group consisting of acrylate / behenol polyoxyethylene ether-25 methacrylate copolymer, sodium acrylate / sodium acryloyl dimethyl taurate copolymer, sodium acrylate / sodium acryloyl dimethyl taurate / dimethacrylamide crosslinked polymer, sodium polyacrylate, acrylate / C10-30 alkanol acrylate crosslinked polymer, acrylate / behenol polyether-25 methacrylate copolymer, acrylate copolymer, ammonium acryloyl dimethyl taurate / behenol polyether-25 methacrylate crosslinked polymer, ammonium acryloyl dimethyl taurate / VP copolymer, polyacrylate-13, polyacrylate crosslinked polymer-6, polyacrylamide, PEG-240 / HDI copolymer bis-decyltetradecyl alcohol polyether-20 ether, and hydroxyethyl acrylate / sodium acryloyl dimethyl taurate copolymer. The composition comprises an aqueous phase and an oil phase, wherein (a) a self-emulsifying polymer and (b) a polyol with an IOB value of 5.0 or less are contained in the aqueous phase, and the ultraviolet blocking agent is contained in the oil phase. The above composition does not contain an oil phase thickener, and the viscosity of the oil phase is below 1,000 cps. The active ingredient in the above composition enhances the UV blocking efficiency of the UV blocker through heat. Among them, the polyols with an IOB value of less than 5.0 in (b) above are selected from one or more of the group consisting of glycerol, sorbitol, xylitol, glucose, trehalose, diglycerol, propylene glycol, polyglycerol-3, methylpropylene glycol, butylene glycol, pentanediol, PEG-6, PEG-8, glycerol polyether-26, dipropylene glycol, 1,2-hexanediol and octanediol.

4. The use according to claim 3, characterized in that, The active ingredient that enhances the UV blocking efficiency of the UV blocker through heat is composed of (a) a polymer with self-emulsifying ability and (b) a polyol with an IOB value of less than 5.

0.

5. The use according to claim 3, characterized in that, The aforementioned ultraviolet blocking agents are selected from one or more of the group consisting of aminobenzoic acid compounds, benzophenone compounds, cinnamate compounds, salicylate compounds, inorganic metal oxides, butylmethoxydibenzoylmethane, terephthalylidenedicamphorsulfonic acid, phenylbenzimidazole sulfonic acid, bemotrizinol, and bisoctrizole.

6. The use according to claim 3, characterized in that, The aforementioned self-emulsifying polymers are aqueous thickeners.

7. The use according to claim 3, characterized in that, When the above composition is irradiated with ultraviolet light, the heat further increases the ultraviolet blocking efficiency of the ultraviolet blocking agent.

Images