KR20150058633A - Cosmetic composition containing silica composite powder and method for preparing the same - Google Patents

Abstract

The present invention provides a cosmetic composition containing silica composite powder and a method for producing the same. The cosmetic composition includes a UV ray blocking material and heat generating silica. The UV ray blocking material is a core particle in the size of 0.1-200 μm. The heat generating silica is a shell particle in the size of 5-100 nm.

Description

TECHNICAL FIELD The present invention relates to a cosmetic composition containing a silica composite particle powder and a method for producing the same,

The present invention relates to a cosmetic composition containing a silica composite particle powder and a method for producing the same, and more particularly, to a cosmetic composition comprising a core / shell And a method for producing the same.

UV protection cosmetics are functional cosmetics that act to prevent ultraviolet rays to prevent skin erythema, tanning and further skin cancer. Among the raw materials used as one of ultraviolet filters, there is Tinosorb S (trade name) manufactured by BASF and the chemical name (INCI name) is bishexylhexyloxyphenol methoxyphenyltriazine. This raw material is known as an excellent raw material which blocks not only ultraviolet ray A but also ultraviolet ray B region. When the emulsion is used as a solid, it is used by dissolving the emollient as a solvent. However, when there is not enough solvent, crystals are precipitated. This problem is more serious in W / O formulations than in O / W formulations. Also, when the powder is prepared by dissolving Tinosorb S and then supported in the silica molecular sieve, the above-mentioned problems occur.

A method of atomizing a wax-like powder which is melted at a high temperature during the manufacturing process of a general cosmetic product can be carried out by a method of pulverization at a low temperature or melt-precipitation using a solvent, but this method is difficult to handle with a powder powder (LOOSE POWDER) . Tinosorb S has a wax-like property at a melting point of about 195 ° C. Therefore, in order to use Tinosorb S in the form of powder in cosmetics, it is necessary to dispose Tinosorb S in powder form in order to have a special structure spatially by arranging different kinds of materials in three dimensions It is necessary to composite S powder.

Korean Patent Publication No. 10-2012-0058795

In order to solve the above-mentioned problems, the present invention relates to an ultraviolet screening agent composition comprising an ordered mixture prepared by mixing ultraviolet screening powder and pyrogenic silica having a carbon content of 0.1 to 7.0% by weight, There is provided a process for producing a cosmetic composition comprising silica composite particle powder which is excellent in dispersion stability, particularly stability in dispersion in oil, and which does not cause precipitation of an ultraviolet screening agent and coagulation and separation of composite particles by attaching and fixing pyrogenic silica on the surface The purpose of that is to do.

In order to solve the above-mentioned problems, the present invention provides a cosmetic composition containing silica composite particles, which comprises an ultraviolet screening agent and pyrogenic silica, wherein the ultraviolet screening agent is a core particle and has a particle size of 0.1 to 200 탆, The fumed silica is a shell particle and provides a cosmetic composition having a particle size of 5 to 100 nm.

In one embodiment of the present invention, the pyrogenic silica may contain 0.1 to 7.0% by weight of carbon.

In one embodiment of the present invention, the silica composite particles may be contained in an amount of 0.1 to 50.0% by weight based on the total weight of the composition.

In one embodiment of the present invention, the cosmetic composition may be in a water-in-oil type or an underwater type.

In one embodiment of the present invention, the ultraviolet screening agent may be at least one selected from the group consisting of triazine, traazone, cinnamate, salicylate, and benzophenone.

In one embodiment of the present invention, the ultraviolet screening agent may be Tinosorb S.

In one embodiment of the present invention, the pyrogenic silica may have a specific surface area of 50 to 300 m 2 / g.

In one embodiment of the present invention, the pyrogenic silica is surface-treated with at least one member selected from the group consisting of alkylsilanes, halogenalkylsilanes, alkylsilazanes, alkoxyalkylsilanes, and alkylsiloxanes, . ≪ / RTI >

In one embodiment of the present invention, the ratio of the particle size of the ultraviolet blocking agent to the pyrogenic silica may be 1:10 to 1: 100.

The present invention also relates to a process for preparing an ordered mixture by mixing an ultraviolet screening agent having a particle size of 0.1 to 200 μm and pyrogenic silica having a particle size of 5 to 100 nm; And forming a core / shell type composite particle in which the ultraviolet screening agent is a core particle and the pyrogenic silica is a shell particle, by forming a complex by pulverizing the mixture, A method for preparing a composition is provided.

In one embodiment of the present invention, the pulverization may be performed by a mechano fusion method.

In one embodiment of the present invention, the pulverization may be carried out in a crushing type, a shearing type, an impact type, a surrounding medium type and a non-pulverizing type utilizing thermal shock, And a nonmechanical type.

According to the method for producing a cosmetic composition containing the silica composite particle powder of the present invention, it is possible to produce a silica composite particle powder in the form of a core shell of an ultraviolet screening agent / silica composite particle and to provide a dispersion stability, Therefore, it can be applied to the manufacture of cosmetics of various formulations by preventing the precipitation of ultraviolet screening agent, which is a disadvantage of conventional cosmetics, and coagulation and separation of composite particles.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing a core / shell type composite particle of a cosmetic composition containing a silica composite particle powder according to an embodiment of the present invention. FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail in order to facilitate the present invention by those skilled in the art.

The present invention relates to a process for preparing an ordered mixture by mixing an ultraviolet screening agent having a particle size of 0.1 to 200 μm and pyrogenic silica having a particle size of 5 to 100 nm to form an ordered mixture; And forming a composite particle in the form of a core / shell in which the ultraviolet light blocking agent is core particles and the pyrogenic silica is a shell particle, And a method for producing a cosmetic composition containing the composite particles.

Hereinafter, a method for producing a cosmetic composition containing the silica composite particle of the present invention will be described in more detail.

First, an ordered mixture is formed by mixing an ultraviolet screening agent having a particle size of 0.1 to 200 μm and pyrogenic silica having a particle size of 5 to 100 nm.

In the present invention, the ultraviolet screening agent is prepared by pulverizing and classifying powders to uniformly produce particles having a particle size of 200 탆 or less. If the particle size of the ultraviolet screening agent is less than 0.1 占 퐉 or 200 占 퐉, unlike the random mixture in which the adhesion between the different particles is not observed, it is preferable that the particle size is 0.1 to 200 mu m, more specifically 0.1 to 100 mu m because an ordered mixture can not be formed. The particle size analysis of the ultraviolet screening core particles can be analyzed using a standard. For example, if the particle passes through all of 70 meshes, it can be confirmed that the particle size is less than 200 microns, but the present invention is not limited thereto.

In the present invention, the ultraviolet screening agent may be at least one selected from the group consisting of triazine, traazone, cinnamate, salicylate and benzophenone, preferably triazine. More preferably bis-hexyloxyphenol methoxyphenyltriazine, the trade name of which is known as Tinosorb S (Tinosorb S).

In the present invention pyrogenic silica has a particle size of 5 to 100 nm. The pyrogenic silica may contain 0.1 to 7.0% by weight of carbon.

Wherein the particle size of the pyrogenic silica refers to the original particle size of the pyrogenic silica prior to mixing with the sunscreen powder. The particle size of the pyrogenic silica may be from 5 to 100 nm, more specifically from 5 to 60 nm, and more specifically from 5 to 20 nm. Silica gel, pyrogenic silica, and precipitated silica, which are generally used in cosmetics, are amorphous silica. Particle sizes of silica gel powder and wet silica powder Are not suitable because they are too large to be used as a shell to obtain an ordered mixture. Accordingly, pyrogenic silica having a particle size of 5 to 100 nm is suitable for the present invention.

In the present invention, the ratio of the particle size of the ultraviolet screening agent: pyrogenic silica may be 1:10 to 1: 100. When the particle size of the ultraviolet screening powder as the core is smaller than the particle size of the pyrogenic silica serving as the shell, it is possible to carry out grinding by mechano fusion which proceeds later, and when it is smaller than 100 times, Is too small to produce by mechanofusion.

The silica is easily adhered to the surface of the ultraviolet screening powder and is stable to heat. Therefore, it is suitable as a control material for controlling the properties of the ultraviolet screening powder. The ultraviolet screening powder having a particle size of 0.1 to 200 탆 is used as core particles, When the silica having a size of 5 to 100 nm is used as the shell particle, a highly homogenized ordered mixture can be obtained.

In the present invention, the pyrogenic silica may have a specific surface area of 50 to 300 m 2 / g, preferably 90 to 290 m 2 / g, more preferably 125 to 175 m 2 / g. If the specific surface area of the pyrogenic silica is less than 50 m 2 / g, there is a possibility of being crushed by the subsequent mechanofusion. If the specific surface area exceeds 300 m 2 / g, the composite particle powder can not be obtained. In the present invention, the specific surface area can be measured using a BET measurement method, but is not limited thereto.

In the present invention, pyrogenic silica is surface-treated with a silicone compound to have a carbon content of 0.1 to 7.0% by weight. The silicone compound may be surface-treated with at least one member selected from the group consisting of alkylsilane, halogenalkylsilane, alkylsilazane, alkoxyalkylsilane, and alkylsiloxane. By such surface treatment, the surface of the exothermic silica has an alkyl group So that the carbon content can be controlled. For example, the silicone compound may be chloroalkylsilanes, hexamethyldisilazane, polydimethylsiloxane, or the like. That is, the surface of pyrogenic silica is a hydrophilic surface having a large amount of surface silanol, and the surface of the pyrogenic silica is changed to a surface having water repellency by causing the alkyl group to be distributed on the surface by the surface treatment of the silicon compound, To the surface tension of the alkyl group which is lower than the surface tension of the alkyl group.

Aerosil R972 (EVONIK Industries) containing 0.6 to 1.2% by weight of carbon is commercially available as pyrogenic silica having typical water repellency and pyrogenic silica having a carbon content of 0.1 to 7.0 wt% And is commercially available.

Next, the mixture is compounded by pulverizing the mixture to form a core / shell type composite particle powder in which the ultraviolet screening agent powder is core particles and the pyrogenic silica is shell particles.

In the present invention, the pulverization may be performed by a mechano fusion method.

In general, the mechano fusion method, which is a mechanical particle compositing method using the crushing power of a crusher, is a composite method using contact and friction between particles or between particles and a mechanical device. In this method, (Organic / Inorganic) materials, which are highly charged (organic / inorganic) materials, in an ordered mixed state, which is a mixture state in which adhesion occurs due to interaction between two or more kinds of particles, unlike a random mixture. It is effective when the ratio of the size of the shell of the material is smaller than 1/10. It is a method of composing core particles by converting them into core / shell form by supplying mechanical energy to core particles and shell particles. In addition, the core particles can be compounded under mechanical forces in all directions and shell particles in only one direction. When the particle size is more than 3 micrometers, the mechanical energy is applied evenly in all directions .

In the present invention, the silica composite particle powder by the mechano fusion method can use various pulverization methods, and the usable mechanical apparatuses can be classified into two types according to the manner in which the pulverizing force is applied to the material to be pulverized: 1) 2) Impact type applied to the surface of one material; 3) Type of impact applied directly to the surface of the material, not applied directly to the surface of the material; A surrounding medium type, and 4) a nonmechanical type which utilizes the energy of the crushing force as a mechanical rather than a thermal shock, explosive force or fluid movement. More specifically, it is possible to use Jaw crushers, Gyratory crushers, Impact mills, Roll crushers, Dry pans and crusher mills, Shredders, Rotary cutters and dicers, Media mills, Peripheral-speed mills, Or various mechanical devices may be used in combination, but the present invention is not limited thereto.

The present invention also relates to a process for producing an ultraviolet screening composition, which comprises the steps of: preparing ultraviolet screening powder particles having a particle size of 0.1 to 200 m by the above-described production method as core particles and pyrogenic silica particles having a particle size of 5 to 100 nm, ) Particles in the form of a core / shell.

On the basis of the core particles, the shell particles are bound by electrostatic attraction by the mechanofusion method to surround the core particles. Once the shell particles surround the core particles, the shell particles can then overlap and bond. More shell particles can be additionally stacked together after the overlapping shell particles. Such core / shell particles are shown in Fig. In FIG. 1, each of the shell particles is indicated by a different color for classification but is the same material.

Since the silica composite particle powder according to the present invention is silica, the surface tension of the composite particles can be controlled according to the carbon content composition of the surface-modified silica surface. In order to use the ultraviolet absorbing agent / silica composite particles in cosmetics, The silica acting as the surface layer of the ultraviolet screening agent / silica composite particle behaves like an interface film between the ultraviolet screening agent and the dispersion medium, so that the ultraviolet screening agent on the wax is encapsulated and is dispersed and stabilized in an encapsulation state.

The present invention also relates to a composition of the present invention, wherein the core / shell type silica composite particle powder in which the ultraviolet screening agent powder is core particles and the pyrogenic silica is shell particles is 0.1 to 50.0 wt% , The particle size of the ultraviolet absorbing agent powder is 0.1 to 200 탆, and the particle size of the exothermic silica is 5 to 100 nm.

That is, the present invention provides a cosmetic composition wherein the silica composite particle powder according to the present invention is contained in an amount of 0.1 to 50.0% by weight, preferably 1.0 to 20.0% by weight based on the total weight of the composition. In the present invention, the cosmetic composition may be in the form of a water-in-oil type or a water-in-water type, and is particularly applicable to cosmetics since it has excellent stability in oil dispersion.

The present invention will be described in more detail through the following examples. However, the examples are for illustrating the present invention, and the scope of the present invention is not limited thereto.

[Example 1] Production of Tinosorb S / Silica Composite Particle Powder

1) 150 g of Aerosil R972 having a particle size of 15-20 nm, a BET surface area of 110 20 m 2 / g and a carbon content of 0.6-1.2% by weight, and a 100 mesh standard , 850 g of Tinosorb S powder was put into a 5 L cylinder ball mill, 300 g of Ø5 mm zirconia balls were added, and the mixture was treated at 35 rpm for 1 hour.

2) The mixture obtained in 1) above was filtered with a 10 mesh mesh to remove zirconia balls.

3) The Tinosorb S / Silica mixture obtained in 2) was treated once with a hammer mill having a rotor diameter of 12 cm and a maximum of 9600 rpm.

4) The mixture obtained in the above 3) was treated once with an airflow impact air jet mill under the condition of air pressure of 6 kg / cm ² , so that the particle size of the finally prepared Tinosorb S / Silica composite particle powder was made to be 200 micrometers or less.

[Example 2] Preparation of Tinosorb S / Silica Composite Particle Powder

1) 150 g of Aerosol R805 having a particle size of 10 to 15 nm, a BET surface area of 150 ± 25 m 2 / g and a carbon content of 4.5 to 6.5% by weight, and a 150 mesh mesh , 850 g of Tinosorb S powder was put into a 5 L cylinder ball mill, 300 g of Ø5 mm zirconia balls were added, and the mixture was treated at 35 rpm for 1 hour.

2) The mixture obtained in 1) above was filtered with a 10 mesh mesh to remove zirconia balls.

3) The Tinosorb S / Silica mixture obtained in 2) was treated once with a hammer mill having a rotor diameter of 12 cm and a maximum of 9600 rpm.

4) The mixture obtained in the above 3) was treated once with an air jet impact air jet mill under the condition of air pressure of 6 kg / cm ² , so that the particle size of the finally prepared Tinosorb S / Silica composite particle powder was made to be 150 micrometers or less.

[Example 3] Preparation of Tinosorb S / Silica Composite Particle Powder

1) 150 g of Aerosol R812 having a particle size of 5 to 10 nm, a BET surface area of 260 ± 30 m2 / g and a carbon content of 2.0 to 3.0% by weight, and a 200 mesh mesh , 850 g of Tinosorb S powder was put into a 5 L cylinder ball mill, 300 g of Ø5 mm zirconia balls were added, and the mixture was treated at 35 rpm for 1 hour.

2) The mixture obtained in 1) above was filtered with a 10 mesh mesh to remove zirconia balls.

3) The Tinosorb S / Silica mixture obtained in 2) was treated once with a hammer mill having a rotor diameter of 12 cm and a maximum of 9600 rpm.

4) The mixture obtained in 3) was treated once with an airflow impinging air jet mill under the condition of air pressure of 6 kg / cm ² , so that the final particle size of the Tinosorb S / Silica composite particle powder was made to be 100 micrometers or less.

[Example 4] Preparation of cosmetic composition

A cosmetic composition was prepared using the components according to the following Table 1 and the composite particles prepared in Example 2 above. The production method is as follows.

(1) Oily component 1 was heated (70-75 DEG C) and mixed uniformly.

(2) Oily component 2 was uniformly mixed at room temperature.

(3) The aqueous component 1 was uniformly dissolved and mixed by heating (70 - 75 캜).

(4) The above-mentioned (1) was slowly added to the above (3) while maintaining the temperature (70-75 ° C) under stirring, and then the above (2) was introduced.

(5) The aqueous component 2 was slowly added to the above (4) and then cooled to obtain an oil-in-water type (O / W) emulsion of a cream formulation.

[Comparative Example 1] Preparation of cosmetic composition

Cosmetic compositions were prepared using the ingredients according to Table 1 below. The production method is as follows.

(1) Oily component 1 was heated (70-75 DEG C) and mixed uniformly.

(2) Oily component 2 was uniformly mixed at room temperature.

(3) The aqueous component 1 was uniformly dissolved and mixed by heating (70 - 75 캜).

(4) The above-mentioned (1) was slowly added to the above (3) while maintaining the temperature (70-75 ° C) under stirring, and then the above (2) was introduced.

(5) The aqueous component 2 was slowly added to the above-mentioned (4) and then cooled to obtain an underwater type emulsion.

division Raw material name Example 4 Comparative Example 1 #One #2 Oily component 1 Octylmethoxy cinnamate 6.5 7.5 Isoamyl para methoxy cinnamate 2.0 2.0 C12-15 alkyl benzoate 7.0 7.0 Bishexyloxyphenol methoxyphenyltriazine (trade name: Tinosorb S) - 6.0 Meadow Foam Seed Oil 0.5 0.5 antiseptic 0.3 0.3 Glyceryl stearate SE / peptide-100 stearate 1.0 1.0 Oily component 2 Silica 1.0 - Titanium Dioxide / Stearic Acid / Alumina 5.15 5.15 Tinosorb S / S Silica composite particles (material of Example 2) 7.06 - Cyclomethicone 3.0 3.0 Dimethicone 0.5 0.5 Phenyl trimecicone 2.0 2.0 Aqueous component 1 Purified water To 100 To 100 glycerin 5.0 5.0 Butylene glycol 5.0 5.0 Disodium iodide 0.02 0.02 Polysaccharide of skirt mushroom 2.0 2.0 antiseptic 0.5 0.5 Trehalose 0.5 0.5 NATO SOCKS 0.02 0.02 Aqueous component 2 Polyacrylate-13 / Polyisobutene / Polysorbate 20 1.0 1.0

[Example 5] Preparation of cosmetic composition

The cosmetic composition was prepared using the components according to the following Table 2 and the composite particles prepared in Example 2 above. The production method is as follows.

(1) The aqueous components were uniformly mixed.

(2) Oily component 1 was uniformly mixed and dissolved.

(3) Oily component 2 was uniformly dispersed.

(4) The above-mentioned (3) was slowly added to the above (2) under stirring at room temperature.

(5) The above-mentioned (1) was slowly added to the above (4) under stirring at room temperature to obtain a water-in-oil type emulsion.

[Comparative Example 2] Preparation of cosmetic composition

Cosmetic compositions were prepared using the ingredients according to Table 2 below. The production method is as follows.

(1) The aqueous components were uniformly mixed.

(2) Oil component 1 was heated (70-75 DEG C) and mixed uniformly.

(3) Oily component 2 was uniformly mixed.

(4) The above-mentioned (1) was slowly added to the above (2) under stirring.

(5) The above-mentioned (1) was slowly added to the above (4) under stirring at room temperature to obtain a milky water-in-oil type (W / O) emulsion.

division Raw material name Example 5 Comparative Example 2 Aqueous component Purified water TO 100 TO 100 Disodium iodide 0.02 0.02 Butylene glycol 10.0 10.0 antiseptic 0.4 0.4 Oily component 1 Octylmethoxy cinnamate 7.0 7.0 Isoamyl para methoxy cinnamate 2.0 2.0 Octyl salicylate 4.0 4.0 Bishexyloxyphenol methoxyphenyltriazine (trade name: Tinosorb S) - 6.0 Oily component 2 Piggy-10 Dimethicone 1.0 1.0 Tinosorb S / S Silica composite particles (material of Example 2) 7.06 - Titanium Dioxide / Stearic Acid / Alumina 1.0 1.0 Phenyl trimethicone 2.0 2.0 Cyclopentasiloxane 25.0 25.0

[Test Example 1] Ultraviolet blocking power test

The UV-blocking index of Comparative Example 1 in which Tinosorb S was dissolved in a solvent and Example 4 in which Tinosorb S / Silica composite particles were used was compared and confirmed by in-vivo test. The results are shown in Table 3.

UV protection test result SPF PFA (PA) Example 4 60.5 10 (+++) Comparative Example 1 56.8 8 (+++)

As can be seen from the above Table 3, when the Tinosorb S / Silica composite particles were used, the SPF and PFA values were higher than those obtained by dissolving Tinosorb S in the solvent. Even when Tinosorb S is dissolved in a solvent and used in the form of Tinosorb S / Silica composite particles, there is no decrease in ultraviolet blocking power.

[Test Example 2] Stability test

The stability of Tinosorb S precipitated in Comparative Example 2 when Tinosorb S was dissolved in solvent and in Example 5 used Tinosorb S / Silica composite particle were compared and observed. The results are shown in Table 4 below.

Stability test result (after 4 weeks) Thermostat temperature Example 5 Comparative Example 2 45 ° C O O 37 ℃ O O Room temperature O O 5 ℃ O X Minus 20 ° C O X O: stable, X: precipitation

As shown in Table 4, there was no precipitation of Tinosorb S at all temperatures in Example 5, which was used as Tinosorb S / Silica composite particles. In Comparative Example 2 in which Tinosorb S was dissolved in a solvent, Precipitation of Tinosorb S was observed at -20 ℃. When Tinosorb S was dissolved in a solvent, there was a problem of precipitation, but it was not found when it was used in the form of Tinosorb S / Silica composite particles which are not melted and used as powder.

Claims (18)

A cosmetic composition comprising silica composite particles,
A sunscreen agent and pyrogenic silica,
The ultraviolet screening agent is a core particle and has a particle size of 0.1 to 200 탆,
Wherein the pyrogenic silica is a shell particle and has a particle size of 5 to 100 nm. The method according to claim 1,
Wherein the pyrogenic silica contains 0.1 to 7.0% by weight of carbon. The method according to claim 1,
Wherein the silica composite particle is contained in an amount of 0.1 to 50.0% by weight based on the total weight of the composition. The method according to claim 1,
Wherein the cosmetic composition is a water-in-oil type or an underwater type. The method according to claim 1,
Wherein the ultraviolet light blocking agent is at least one selected from the group consisting of triazine, trazone, cinnamate, salicylate, and benzophenone. The method according to claim 1,
Wherein the ultraviolet light blocking agent is thioxob. The method according to claim 1,
Wherein the pyrogenic silica has a specific surface area of 50 to 300 m 2 / g. The method according to claim 1,
Wherein the pyrogenic silica is surface-treated with at least one member selected from the group consisting of an alkylsilane, a halogenalkylsilane, an alkylsilazane, an alkoxyalkylsilane, and an alkylsiloxane, and the alkyl group is distributed on the surface. The method according to claim 1,
Wherein the ultraviolet light blocking agent: pyrogenic silica has a particle size ratio of 1:10 to 1: 100. A method for producing a cosmetic composition according to claim 1,
Mixing an ultraviolet screening agent having a particle size of 0.1 to 200 mu m and pyrogenic silica having a particle size of 5 to 100 nm to form an aligned mixture; And
Forming a core / shell type composite particle in which the ultraviolet shielding agent is a core particle and the pyrogenic silica is a shell particle. 11. The method of claim 10,
Wherein the pyrogenic silica has a carbon content of 0.1 to 7.0% by weight. 11. The method of claim 10,
Wherein the ultraviolet screening agent is at least one selected from the group consisting of triazine, trazone, cinnamate, salicylate, and benzophenone. 11. The method of claim 10,
Wherein the ultraviolet light blocking agent is thioxob. 11. The method of claim 10,
Wherein the pyrogenic silica has a specific surface area of 50 to 300 m 2 / g. 11. The method of claim 10,
Wherein the exothermic silica is surface-treated with at least one member selected from the group consisting of an alkylsilane, a halogenalkylsilane, an alkylsilazane, an alkoxyalkylsilane and an alkylsiloxane, and the alkyl group is distributed on the surface. 11. The method of claim 10,
Wherein the ultraviolet screening agent: pyrogenic silica has a particle size ratio of 1:10 to 1: 100. 11. The method of claim 10,
Wherein the pulverization is by a mechanofusion method. 11. The method of claim 10,
Wherein the pulverization is at least one selected from the group consisting of a crushing type, a shearing type, an impact type, a standing round medium type, and a non-mechanical type using thermal shock, explosive force or fluid movement.

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