JPS6251931B2 - - Google Patents

Description

[Detailed description of the invention]

TECHNICAL FIELD The present invention relates to a novel cosmetic having an ultraviolet shielding effect. Conventionally, for example, in makeup cosmetics, inorganic pigments such as titanium dioxide and ultraviolet absorbers have been simply added to the cosmetics in order to have an ultraviolet shielding effect. For example, in the case of makeup cosmetics containing fine particles of titanium dioxide, its light scattering effect provides a UV shielding effect, but its hiding power not only makes the makeup look white and floating, but also makes it difficult to adhere to the skin. It is bad and lacks spreadability, so it adheres thickly to the skin and does not give a transparent makeup finish.
This impairs the make-up effect, and furthermore, this causes problems and puts a burden on the skin, both physiologically and due to the feeling of use. On the other hand, ethyl urocanate, 2-hydroxy-
In the case of make-up cosmetics that contain various UV absorbers such as 4-methoxybenzophenone, there are concerns about safety because the UV absorbers themselves can irritate the skin, and the absorbers that absorb light energy can cause temporary irritation to the skin. There's a problem. Therefore, the use of ultraviolet absorbers is limited to a limited number of specific types. In addition, among these UV absorbers, there are water-soluble and oil-soluble types, and in the complex and diverse formulations of makeup cosmetics, it is necessary to select and use them based on quality stability, safety, and effectiveness. You will be more restricted. The present inventor has discovered that the above-mentioned problems can be solved by incorporating into cosmetics a spherical porous resin powder that disperses and binds a substance that has the ability to prevent the passage of ultraviolet light within a spongy porous structure with a maximum pore diameter of 5 to 160 Å. This discovery was made based on the discovery that it can eliminate the problem, give a soft feeling of use, have excellent transparency, have good affinity with sebum, have an excellent effect on preventing whiteness from lifting, have excellent press filling properties, and have good makeup persistence. Based on this, the present invention was completed. The substances having the ability to prevent the passage of ultraviolet rays used in the present invention include inorganic pigments, ultraviolet absorbers, and vitamins that have an ultraviolet blocking effect. First, to specifically describe inorganic pigments, they are inorganic pigments that can block ultraviolet rays, such as fine powders such as titanium dioxide, iron oxide, zinc oxide, and barium sulfate, and finely powdered titanium mica, and are preferably ultrafine particles to fine powder particles. (average particle size of about 0.02 to 0.05μ). As the ultraviolet absorber, known ones can be used. For example, aminobenzoates include 2-ethylhexyl-para-dimethylaminobenzoate, amyl-para-dimethylaminobenzoate, glyceryl-para-aminobenzoate, ethyl-para-dimethylaminobenzoate, ethyl-para-diethylaminobenzoate, and glyceryl-para-aminobenzoate. Mono-para-aminobenzoate, salicylate-based products include para-tertiary butyl salicylate, para-octylphenyl salicylate, dipropylene glycol salicylate, and cinnamate-based products include 2-ethoxyethyl-para-methoxycinnamate. Mate, 2,
2′-bis(para-methoxystyryl)-ethyl-
para-methoxycinnamate, 2-ethoxyethyl-para-methoxycinnamate, methyl-2,
5-diisopropyl cinnamate, benzophenone-based products such as 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxy-4'-methylbenzophenone, 2-hydroxy-4-methoxy-5-sulfonate Benzophenone, sodium-2,2'-dihydroxy-4,4'-dimethoxy-5-sulfobenzophenone, 2,2'4,
4'-tetrahydroxybenzophenone, 2,4-
Dihydroxybenzophenone, 2-hydroxy-
Examples include 4-methoxybenzophenone, 2,2'-dihydroxy-4,4'-dimethoxybenzophenone, and urocanic acid. In addition, vitamins have an ultraviolet absorption effect, such as vitamin A ₁ , vitamin
Examples include vitamins such _as A ₂ , vitamin A ₃ , vitamin B 2 , and vitamin B ₁₂ . The content of the substance in the spherical porous resin powder containing the substance that has the ability to prevent the passage of ultraviolet rays is 0.2~
It is about 50%. The spherical porous resin powder applied to the present invention has a particle size of 1 to 40μ, an average particle size of 2 to 20μ, and has large and small pores with a maximum pore diameter of 5 to 160Å on the spherical surface. be. Here, the maximum number means at least a majority, preferably a majority.
(Spherical shape in the present invention naturally includes not only true spheres but also ellipsoids and other similar shapes.) The more porous resin powder is, the more inert powder (empty material with ultraviolet ray protection ability) The UV-cutting effect of the spherical porous resin powder contained in the pores in a physically bonded state and the desired effect of the makeup finish (eg, transparency) can be obtained. The spherical maximum pore diameter of the present invention is less than 5 Å, for example 1 Å
In this case, the diffused reflection of light on the surface decreases and a sufficient UV-cutting effect cannot be obtained. When the maximum pore diameter exceeds 160 Å, the number of pores per unit surface area decreases, resulting in a spherical shape with many bumps, making it difficult for cosmetics to spread.
When the thickness is about 300 Å, a substance having the ability to prevent ultraviolet light from passing through may escape from the spherical porous resin powder. The porous resin powder itself is transparent (light transmitting) and has an affinity for oil agents, such as polyvinyl acetate, poly N-vinylpyrrolidone, poly 2,4-diamino-6 -Phenyl-
1,3,5-triazine, polymethacrylate ester (methyl ester, ethyl ester, etc.), polyacrylate ester (methyl ester, ethyl ester, etc.), styrene divinylbenzene copolymer, ethylene vinyl acetate copolymer, vinyl chloride Examples include vinyl acetate copolymer, nylon, polytetrafluoroethylene, and polyethylene. The maximum pore size is 5~
The spherical porous resin powder dispersed and confined within the 160 Å cavernous porous structure has the substance physically bonded to the pores of the powder. The substance having the ability to prevent ultraviolet light from passing through is bound to the spherical porous resin powder by the pore diameter on the surface of the spherical porous resin powder, by the inner wall surface of the pores, or by being sealed inside the resin. There are various manufacturing methods, but for example, the final product of spherical porous resin powder (excluding the substance that prevents the passage of ultraviolet light) is made of polyvinyl acetate, polyN-vinylpyrrolidone, poly2,4-diamino -6-phenyl-1,3,5
- In the case of triazine, polymethacrylic acid ester, polyacrylic ester, etc., when emulsion polymerization or suspension polymerization of monovinylidene monomer or polyvinylidene monomer, the above-mentioned substance having the ability to prevent the passage of ultraviolet rays is dispersed, or The monomer solution is immersed and dissolved, stirred using water as a medium in the presence of a polymerization catalyst and an emulsifier, and reacted. After the reaction is completed, washing with an organic solvent such as acetone, ethanol, isopropyl alcohol, water washing, boiling, and filtration are repeated. After that, a method of drying and classifying is advantageously used. In order to obtain the above-mentioned spherical porous resin powder containing the substance having the ability to prevent the passage of ultraviolet rays of the present invention, if the monovinylidene monomer, polyvinylidene monomer and the substance having the ability to prevent the passage of ultraviolet rays are dissolved in water, polymerization is required. After the reaction is completed, one or more organic salts, inorganic salts, or inorganic compounds are added,
It can be obtained using salting out. If only the ultraviolet absorber is dissolved, the spherical porous resin powder is produced and then injected to obtain the spherical porous resin powder mixed with the ultraviolet absorber. The characteristics of the cosmetic composition of the present invention containing the spherical porous resin powder having the ability to prevent the passage of ultraviolet rays obtained as described above are as follows. (1) When using an ultraviolet absorber, the above-mentioned irritation is eliminated because the absorber does not come into direct contact with the skin unlike in conventional methods, which improves safety. (2) When using an inorganic pigment, the spreadability of the pigment is improved compared to conventional methods, and it adheres thinly and evenly to the skin, and does not adhere thickly, so it does not put a burden on the skin. (3) When titanium dioxide is used, the light scattering effect of titanium dioxide is further increased. (4) The effects of blending the spherical porous resin powder itself are maintained. That is,
Gives a soft feel, has excellent transparency, has good affinity with sebum, has excellent anti-whitening effect and press filling properties, and has good makeup retention. Due to these characteristics, the present invention is particularly suitable as a makeup cosmetic. (5) Conventionally, considering the safety of UV absorbers, their use has been minimized, and the structure of the absorbers has made their use difficult, so cosmetics with sufficient UV blocking effects have been developed. However, in the case of the present invention, there is no such concern, and thus a cosmetic with unprecedented effects can be provided. That is,
Due to the absorption effect of the ultraviolet absorber and the diffuse reflection effect derived from the porous surface, for example,
It has a sunblock effect by absorbing a wavelength of 310 mμ, and it also has an effect of making spots, freckles, or fine wrinkles on the face less noticeable when makeup is applied by absorbing a wavelength of 300 to 400 mμ. (6) Derived from spherical porous resin powder, it can maintain makeup effects for a long time without causing makeup smudges, leaving the skin with no feeling of tightness or dryness, and no unevenness. The present inventors conducted a comparison with conventional powders (titanium dioxide, zinc oxide) in order to demonstrate the usability of the spherical porous resin powder containing the substance having the ability to prevent the passage of ultraviolet light according to the present invention as a cosmetic. The results are shown in Tables 1 and 2. Tests were conducted on the raw materials themselves and the cosmetics (Examples 1 to 3). The usage test items are A: Spreadability, B: Uniformity of coating (raw materials only), C: Thickness, and D:
Transparency, E: Floating whiteness, F: Longevity of makeup (cosmetics only, the same applies hereinafter), G: Cutting effect, H: Inconspicuousness of skin troubles, I: Overall evaluation.

【table】

[Table] Furthermore, the ultraviolet shielding effect of the spherical porous resin powder containing the substance having the ability to prevent the passage of ultraviolet rays according to the present invention was evaluated using inorganic substances such as titanium oxide and titanium mica.
A comparison of the UV absorption effect between the simple mixture of organic UV absorbers, 2-hydroxy-4-methoxybenzophenone, and 2-ethoxyethyl 4-methoxycinnamate and the product of the present invention is made as follows. The results are shown in Figures 1 and 2. (Test method) 0.33 g of pigment or UV absorber made of 40% inert methacrylic acid methyl ester and 0.9 g of castor oil.
Add and knead 200 times with a Huber muller. Then, 1.4 g of an alcoholic solution of 48% Sierrak resin was added to the kneaded mixture, thoroughly stirred, and applied to a quartz plate using a 12.7 μ (0.5 mil) doctor blade. After air-drying, Hitachi Spectrum Absorbance was measured using a photometer (recording type). FIG. 1 shows that the products of the present invention (inert titanium oxide and inert titanium mica) clearly have higher absorbance in the entire ultraviolet wavelength range. In Figure 2, B (inert powder containing 5% of 2-hydroxy-4-methoxybenzophenone) prevents A (simple mixture) from rapidly decreasing absorbance in the wavelength range of 340 nm or more, and prevents skin stains. , generally effective in reducing the appearance of freckles and preventing pigmentation.
It enhances the UV shielding effect in the wavelength range of 330 nm and above. Note that the absorbance in FIGS. 1 and 2 is a full scale of 3. (Comparison with the invention described in JP-A No. 47-28157) Comparative Examples 1 to 3, which are the inventions described in JP-A-47-28157, are shown below. The results of the effectiveness evaluation are also shown in Figure 2. Comparative Example 1 (Ultraviolet (UV) absorber alone) 2-Hydroxy-4-methoxybenzophenone was ground with a grinder, and 300
Take 5g of particles of mesh size (46μ) or less, add 300ml of 10% gelatin solution and 300ml of 10% gum arabic solution.
ml of the mixture. While keeping this liquid at 40℃ using a magnetic stirrer with a bathtub control, 10% acetic acid was gradually added dropwise to adjust the pH to 4.0, and then purified water prepared separately was added to bring the total volume to 4. Cool to 7°C with stirring. Formalin 40 in this
ml and 20 ml of glutaraldehyde were added and cured, followed by vacuuming and filtration to obtain an encapsulated product. This was thoroughly washed with water, dispersed in acetone, dehydrated using an aspirator, dried to completely remove acetone, and measured for particle size distribution using a Coulter counter. As a result, a capsule compound with an average particle size of 34.8 μm was obtained.
(Contains about 4% of 2-hydroxy-4-methoxybenzophenone) Comparative Example 2 (UV absorber adsorbed to porous material <acidic clay>) 2-hydroxy-4- is added to 300 ml of isopropyl alcohol in an Erlenmeyer flask with a stopper. Add 40 g of acid clay to a solution containing 40 g of methoxybenzophenone, stir with a magnetic stirrer for 1 hour,
After sufficiently impregnating and adsorbing on acidic clay, the isopropyl alcohol was distilled off and dried at 40°C for 48 hours. Next, crush the UV absorber adsorbing acid clay using a crusher, take 8g of particles of 300 mesh or less using a Tyler mesh, add 300ml of 10% gelatin aqueous solution and 10%
It was dispersed in a mixture of 300 ml of gum arabic aqueous solution.
Thereafter, the same method as in Comparative Example 1 was used. (Average particle size 27.5 μ) (Contains about 3% 2-hydroxy-4-methoxybenzophenone) Comparative Example 3 (2-hydroxy-4-methoxybenzophenone/PMMA solid solution) Add 500 ml of chloroform to an Erlenmeyer flask with a stopper. After dissolving 45 g of 2-hydroxy-4-methoxybenzophenone with stirring, 45 g of polymethyl methacrylate was added and stirring was continued to form a uniform solution. Chloroform was distilled off from this homogeneous solution while keeping it at 50°C to obtain a solid solution. Crush this solid solution to an appropriate size, grind it with 300 g of magnetic balls in a porcelain pot with a capacity of 1 for about 1 hour, take it out, take out 8 g of particles of less than 300 mesh using a Tyler mesh, and add it to a 10% gelatin aqueous solution.
It was dispersed in a mixture of 300 ml and 300 ml of 10% aqueous gum arabic solution. Thereafter, the same procedure as in Comparative Example 1 was carried out. (Average particle size 31.5μ) (Contains about 3% of 2-hydroxy-4-methoxybenzophenone) From Figure 2, Comparative Examples 1 to 3 are in the long wavelength ultraviolet region.
The sharp drop is remarkable at 340nm, especially at 360nm and above, and the tumble cover effect is extremely small. Next, a PMMA powder containing 5% of 2-hydroxy-4-methoxybenzophenone (same as that measured by ultraviolet transmitted light), which is an example of a spherical porous resin powder blended into the cosmetic of the present invention, and a comparative example 1. Measurement of scattered reflection with 1.
As shown in Fig. 4. (Sample Preparation Method) Precisely weigh 1 g of the sample, take 3 g of volatile oil, treat it 100 times with a Huber Mahler, form a film on a slide glass plate using a 0.3 mil doctor blade, and dry. Measure using a gloss meter (manufactured by JEOL Ltd.). Set the incident angle and reflection angle and set them to 0 using a black felt board.
Make adjustments. After adjusting each incident angle using a standard plate, the sample is placed on the photosensitive area, the reflection angle is varied from 0 to 90°, and the reaction light at that time is measured. From FIG. 3, it can be seen that the reflection pattern of the present invention does not have a specular reflection peak (45°) and exhibits a diffuse reflection type. It can be seen from FIG. 4 that the invention disclosed in Japanese Patent Application Laid-Open No. 47-28157 exhibits a typical specular reflection peak (45°). Conventional make-up cosmetics have often used powders with relatively weak covering power. However, when these are used in make-up cosmetics, although a transparent finish effect can be obtained, it is difficult to hide problems such as fine wrinkles, spots, and freckles. It has been found that the above-mentioned troubles are made less visible in areas where the percentage of light that passes through the product of the present invention (light transmittance) and the reflection of light show a maximum (or minimum) or an inflection point. As a result of examining the light reflection pattern of the powder material itself of the product of the present invention, the result shows a type of reflection in which the direction of the reflected light is not constant and is diffused. This will hide problems. In other words, it is a powder that simultaneously blurs the shadows around the problem and reduces the difference in brightness with the surrounding area. The conventional idea was to cover this up with a thick layer of makeup, but this makeup actually hides spots and freckles optically, but makes fine lines and wrinkles more noticeable. Hereinafter, the present invention will be explained in detail with reference to Examples. Example 1 Phase powder Vinyl acetate 18Kg, ethylene dimethacrylic acid 1.8
0.5 kg of α-α′ azobisisobutyronitrile and 700 kg of hexane were mixed to form a homogeneous solution. 18 kg of titanium dioxide was added to this and thoroughly stirred and dispersed. This mixed dispersion solution was added to 900 kg of distilled water in which the activator (nonionic activator) had been dissolved, and the mixture was heated to 70°C while stirring.
The reaction was carried out for 10 hours. After the reaction was completed, the mixture was washed with water, washed repeatedly with isopropyl alcohol, boiled, and dried to obtain 30.6 kg of spherical porous resin powder containing titanium dioxide. After mixing 50 parts of the powder prepared as above, 10 parts of silk powder, 34 parts of talc, 2.0 parts of microcrystalline cellulose and Bengara in a Henschel mixer,
Grinded with a grinder. While stirring this with a Henschel mixer, add 1.5 parts of squalane and 2.
-1.5 parts of octyl dodecyl oleate was added and mixed with stirring for 10 minutes. 0.7 part of fragrance was added to this and stirred and mixed for 2 minutes. The resulting mixture was homogenized using a blower sifter and filled into a container to obtain phase powder. It was confirmed that this product has transparency and adhesion, adheres thinly and evenly to the skin, does not put any burden on the skin, and has an extremely high ultraviolet shielding effect. In addition, it was confirmed that it gave a soft feel, prevented whiteness from floating, and had good makeup longevity. In comparison with the above example, a spherical porous resin powder containing no titanium dioxide was prepared, and a phase powder produced in the same manner as in this example by separately blending this and tanium dioxide had poor spreadability. , it thickly adhered to the skin, placed a burden on the skin, and had poor transparency. Example 2 Emulsified foundation 18Kg of methyl methacrylate, 7.2Kg of ethylene dimethacrylate, 660Kg of toluene and cumene peroxide
0.2Kg was mixed to make a homogeneous solution. Distilled water 800Kg
20 kg of 2-ethylhexylparadimethylaminobenzoate was dispersed in an aqueous activator solution in which 0.1 kg of an activator (anionic activator) was dissolved. The homogeneous solution described above was added to this dispersion, and a polymerization reaction was carried out at 70° C. for 9 hours while stirring. After the reaction was completed, it was thoroughly washed with water and then with ethyl alcohol. After repeated immersion in hot water and boiling, the mixture was dried to obtain 33 kg of spherical porous resin powder containing 2-ethylhexylparadimethylparaaminobenzoate. FIG. 5 shows an electron micrograph showing the particle structure of the spherical porous resin powder (25,000 times: particle size: about 3.2 μm: ultraviolet absorber content: about 25%). It can be seen from FIG. 5 that the spherical porous resin powder has a spongy porous structure. Further, as a comparative example, an electron micrograph (15,000 times: particle diameter approximately 4.8 μm) showing the particle structure of a commercially available nylon SPM produced by a melting method utilizing agglomeration due to surface tension is shown in FIG. It can be seen that the particles shown in FIG. 6 do not have the spongy porous structure that the spherical porous resin powder of the present invention has. A pore distribution diagram of the spherical porous resin powder is shown in FIG. Figure 7 shows the spherical porous resin powder.
It is calculated and illustrated using the Kelvin equation from the water vapor adsorption isotherm at °C according to the Andcrson method. The water vapor adsorption isotherm was measured by a gravimetric method (Kinoshita water adsorption measuring device KR-380). In Figure 7, the horizontal axis represents the pore diameter in Å, and the vertical axis represents the pore diameter in Å.
The capacity of pores within the range of pore diameters on the horizontal axis is shown in %. From the pore distribution diagram in FIG. 7, it is clear that pores in the range of 70 to 110 Å occupy the center. 3.0 parts of powder prepared as above, 2.5 parts of stearic acid, 2.0 parts of beeswax, 15.0 parts of liquid paraffin
part, lanolin 3.0 parts, nonionic activator 6.0, pigment paste 17.0, B, H, T, 0.1 part and B, P,
The mixture of B. was kept at 85°C, and a mixture of 1.0 part of triethanolamine, 6.0 parts of propylene glycol, and 43.68 parts of distilled water heated to 90°C was gradually added and emulsified. The mixture was stirred and cooled, and when the temperature reached 45°C, 0.7 part of fragrance was added. Stirring was continued, and when the temperature reached 35°C, it was filled into a container to obtain an emulsified foundation. In comparison with the above example, a resin powder that does not include an ultraviolet absorber was prepared in the preparation process of the spherical porous resin powder, and this and the ultraviolet absorber were separately blended, and the other steps were performed in the same manner as in this example. As mentioned above, the emulsified foundation caused irritation, but the product of the present invention did not have this problem and was confirmed to be safe. It was also confirmed that the product of the present invention has an ultraviolet shielding effect, and it was also confirmed that it has excellent usability, transparency, affinity with sebum, and anti-whitening effect, and has good makeup persistence. Example 3 Compact Foundation 90 kg of styrene, 18 kg of divinylbenzene, 1 kg of azobisisobutyronitrile, 5 kg of ethyl urocanate and 1250 kg of cyclohexane were mixed to obtain a homogeneous solution. Add the monomer mixture solution to an aqueous solution of 3 kg of activator in 1500 kg of distilled water, and heat to 70°C with stirring.
The polymerization reaction was carried out for 10 hours. After the reaction was completed, it was washed with water, washed with acetone, immersed in warm water, boiled repeatedly, and dried to obtain 54.3 kg of spherical porous resin powder containing ethyl urocanate. 6.1 parts of ozokerite, 7.1 parts of ceresin, lanolin
3.2 parts, microcrystalline wax 1.6 parts, isopropyl myristate 15.0 parts, squalane 3.0 parts
part, nonionic activator 0.3 part and pigment paste
While heating 53.2 parts of the mixture to 80°C and stirring, a mixture of 8.0 parts of the powder prepared as described above and 2.0 parts of the resin powder prepared as in Example 1 was added little by little. In addition, it was well dispersed. The mixture was allowed to cool to 70°C with further stirring, 0.5 part of fragrance was added thereto, the temperature was maintained at 65°C, the mixture was filled into a medium plate, allowed to cool, and the mixture was cooled and filled into containers to obtain a compact foundation. This product has excellent ultraviolet shielding effects and has been confirmed to be safer than conventional products. It also adheres thinly and evenly to the skin, has good adhesion, and has a good feeling of use and transparency.
It has an excellent affinity with sebum, has an excellent effect on preventing whiteness from lifting, and has good makeup longevity. Example 4 Cosmetic cream 18Kg of vinyl acetate, 1.8Kg of ethylene dimethacrylic acid
0.15 kg of Kgα-α′ azobisisobutyronitrile and 700 kg of hexane were mixed to form a homogeneous solution. 18 kg of vitamin A ₂ was added to this and thoroughly stirred and dispersed. This mixed dispersion solution was added to 900 kg of distilled water in which the nonionic activator was dissolved, and a reaction was carried out at 70° C. for 10 hours with stirring. After the reaction was completed, it was washed with water, washed repeatedly with isopropyl alcohol, and then boiled.
After drying, 30.6 kg of spherical porous resin powder containing vitamin _A2 was obtained. 3.0 parts of resin powder prepared as above, 7.5 parts of squalane, 5.0 parts of isopropyl myristate,
2.5 parts triglyceride, 2.0 parts wax, 1.0 lanolin
part, activator (nonionic activator) 4.5 parts, BH
A mixture of 0.02 parts of T.T., 0.1 parts of butylparaben and 0.18 parts of pigment base is dissolved at 80°C and, while maintained at this temperature, 5.1 parts of glycerin, 0.1 parts of methylparaben, 1.0 parts of thickener, and 0.3 parts of neutralizer are added. A mixture of 67.5 parts of distilled water and 67.5 parts of distilled water dissolved at 85° C. was gradually added with stirring. After keeping it at 80°C for 5 minutes, it was cooled with water to 40°C, and 0.2 part of fragrance was added. After cooling to 30°C, it was filled into containers to obtain a cosmetic cream. This product has excellent ultraviolet shielding effects and has been confirmed to be safer than conventional products. It also adheres thinly and evenly to the skin, has good adhesion, and has excellent usability, transparency, compatibility with sebum, and whiteness. It has an excellent anti-lifting effect and long-lasting makeup.

[Brief explanation of the drawing]

Figures 1 and 2 show the spherical porous resin powder containing the substance having the ability to prevent the passage of ultraviolet rays of the present invention, a simple mixture of the substance and the spherical porous resin powder, and the ultraviolet rays of Comparative Examples 1 to 3. It is a graph diagram showing the results of measuring absorbance (vertical axis full scale 3) according to wavelength (nm horizontal axis) for comparison of shielding effects. FIG. 3 is a diagram showing the measurement results of scattered reflection of the present invention, and FIG. 4 is a diagram showing the measurement results of scattered reflection of Comparative Example 1. Fig. 5 is an electron micrograph showing the particle structure of the spherical porous resin powder of the present invention, Fig. 6 is an electron micrograph showing the particle structure of nylon SPM manufactured by the melting method (comparative example), and Fig. 7 is a pore distribution diagram of the spherical porous resin powder of the present invention.

Claims (1)

[Scope of Claims] 1. A substance having the ability to prevent the passage of ultraviolet rays with a maximum pore diameter of 5.
A cosmetic having an ultraviolet shielding effect, characterized by containing spherical porous resin powder that is dispersed and restrained within a spongy porous structure of ~160 Å. 2. The cosmetic according to claim 1, wherein the substance having the ability to prevent the passage of ultraviolet rays is an inorganic pigment. 3. The cosmetic according to claim 1, wherein the substance having the ability to prevent the passage of ultraviolet rays is an ultraviolet absorber. 4. The cosmetic according to claim 1, wherein the substance having the ability to prevent the passage of ultraviolet rays is one or more vitamins. 5 The resin of the spherical porous resin powder is polyvinyl acetate, polyN-vinylpyrrolidone, poly-2,4-
Diamino-6-phenyl-1,3,5-triazine, polymethacrylic acid ester, polyacrylic acid ester, styrene divinylbenzene copolymer,
Ethylene vinyl acetate copolymer, vinyl chloride vinyl acetate copolymer, nylon, polytetrafluoroethylene,
The cosmetic according to claim 1, which is selected from polyethylene and the like. 6. The cosmetic according to claim 1, wherein the cosmetic amount is a make-up cosmetic.