阅读说明：本技术 涂覆有天然物质的球形的氧化锌粉体、其制造方法及包含其的化妆品组合物 (Spherical zinc oxide powder coated with natural substance, method for producing same, and cosmetic composition containing same ) 是由 崔美英 金德镇 金惠兰 徐河麟 于 2019-11-01 设计创作，主要内容包括：本发明提供涂覆有天然物质的球形的氧化锌粉体、其制造方法及包含其的化妆品组合物,更详细而言,涂覆有天然物质的球形的氧化锌粉体包含：粒子的长径比为1至1.5的球形的氧化锌粉体；在球形的氧化锌粉体的表面由TEOS涂覆的TEOS涂覆层；及均匀涂覆于TEOS涂覆层表面的天然物质涂覆层,TEOS涂覆层为均匀的单层,天然物质涂覆层为由选自由月桂酰赖氨酸、可可脂、卵磷脂和硬脂酸组成的组中的一种以上的物质涂覆而成的涂覆层。根据本发明,能够提供不仅紫外线隔离效果优异,而且使用感、分散力、稳定性和对人体的安全性也同时优异的涂覆有天然物质的球形的氧化锌粉体、该氧化锌粉体制造方法及包含该氧化锌粉体的化妆品组合物。(The present invention provides a natural substance-coated spherical zinc oxide powder, a method for producing the same, and a cosmetic composition comprising the same, and more particularly, a natural substance-coated spherical zinc oxide powder comprising: spherical zinc oxide powder having a particle aspect ratio of 1 to 1.5; a TEOS coating layer coated by TEOS is arranged on the surface of the spherical zinc oxide powder; and a natural material coating layer uniformly coated on the surface of the TEOS coating layer, wherein the TEOS coating layer is a uniform single layer, and the natural material coating layer is a coating layer coated by more than one substance selected from the group consisting of lauroyl lysine, cocoa butter, lecithin and stearic acid. According to the present invention, it is possible to provide a natural-material-coated spherical zinc oxide powder which is excellent not only in ultraviolet shielding effect but also in feeling of use, dispersibility, stability and safety to the human body, a method for producing the zinc oxide powder, and a cosmetic composition containing the zinc oxide powder.)

1. A natural material coated spherical zinc oxide powder comprising:

spherical zinc oxide powder having an Aspect ratio (Aspect ratio) of particles of 1 to 1.5;

a TEOS coating layer coated by TEOS (tetraethyl orthosilicate) is arranged on the surface of the spherical zinc oxide powder; and

a natural substance coating layer uniformly coated on the surface of the TEOS coating layer,

the TEOS coating is a uniform single layer,

the natural material coating layer is a coating layer coated with one or more substances selected from the group consisting of Lauroyl Lysine (Lauroyl Lysine), cocoa butter, lecithin, and Stearic acid (Stearic acid).

2. The natural material coated spherical zinc oxide powder according to claim 1, wherein the spherical zinc oxide powder has a major diameter of 30 to 500 nm.

3. The natural material coated spherical zinc oxide powder according to claim 1, wherein the TEOS coating layer is 5 to 70 parts by weight with respect to 100 parts by weight of the spherical zinc oxide powder.

4. The natural material coated spherical zinc oxide powder according to claim 1, wherein the natural material coating layer is 5 to 70 parts by weight with respect to 100 parts by weight of the spherical zinc oxide powder.

5. A method for producing a spherical zinc oxide powder coated with a natural substance, comprising:

a first step of mixing water and zinc oxide in a reactor, and then adding citric acid to dissolve the zinc oxide;

a second step of charging sodium hydroxide into the reactor of the first step along a wall surface of the reactor and stirring the same to form spherical zinc oxide particles having a long diameter of 30 to 500nm and an Aspect ratio (Aspect ratio) of 1 to 1.5;

a third step of TEOS coating the zinc oxide particles of the second step; and

a fourth step of coating the product of the third step with a natural substance,

the natural substance-coated spherical zinc oxide powder body comprises:

spherical zinc oxide powder having an Aspect ratio (Aspect ratio) of particles of 1 to 1.5;

a TEOS coating layer coated by TEOS (tetraethyl orthosilicate) is arranged on the surface of the spherical zinc oxide powder; and

a natural substance coating layer uniformly coated on the surface of the TEOS coating layer,

the TEOS coating is a uniform single layer,

the natural material coating layer is a coating layer coated with one or more substances selected from the group consisting of Lauroyl Lysine (Lauroyl Lysine), cocoa butter, lecithin, and Stearic acid (Stearic acid).

6. The method of claim 5, wherein the sodium hydroxide is fed at a rate of 5 to 10 ml/s.

7. A cosmetic composition comprising the natural material-coated spherical zinc oxide powder according to any one of claims 1 to 4.

8. The cosmetic composition according to claim 7,

the content of the spherical zinc oxide powder is 1 to 25 weight percent,

the cosmetic composition is used for ultraviolet isolation.

Technical Field

The present invention relates to a spherical zinc oxide powder coated with a natural substance, a method for producing the same, and a cosmetic composition containing the same, and more particularly, to a spherical zinc oxide powder coated with a natural substance, which has excellent ultraviolet shielding effect and is excellent in feeling of use, dispersibility, stability, and safety to the human body, a method for producing the same, and a cosmetic composition containing the same.

Background

The following description is merely provided for background information related to the present invention and does not constitute the related art.

In recent years, with worldwide industrialization and urbanization, ozone layer depletion has been rapidly promoted by environmental pollution such as an increase in the amount of carbon dioxide gas released. Ultraviolet rays radiated from the sun to the earth cannot be normally isolated due to rapid destruction of the ozone layer. Therefore, the human body is exposed to ultraviolet rays more than ever, and the early aging of the skin, skin cancer, and the like increase, and thus the attention to ultraviolet screening agents is increasing.

Generally, ultraviolet screening agents used for cosmetic applications are classified into organic ultraviolet screening agents and inorganic ultraviolet screening agents. However, since organic uv-screening agents have disadvantages such as skin toxicity, allergy, and discoloration, inorganic uv-screening agents have been widely used in recent years instead of organic uv-screening agents.

The inorganic ultraviolet-screening agent exerts an ultraviolet-screening effect mainly by absorbing and scattering ultraviolet rays, and a typical inorganic ultraviolet-screening agent is titanium dioxide (TiO) which is a metal oxide having a high refractive index₂) Zinc oxide (ZnO), and the like.

Among them, the zinc oxide uses potato-shaped or rod-shaped particles having a particle size of 100nm or less, and the above potato-shaped or rod-shaped particles have the following disadvantages: in use, an aggregation phenomenon (agglomeration) occurs in which the contact surfaces between particles are aggregated in a surface or line manner, which leads to a reduction in the feeling of use, and in order to obtain an ultraviolet ray shielding effect by the potato-shaped or rod-shaped particles in which the aggregation phenomenon occurs, a powerful dispersing device and a long dispersing time are required.

In order to overcome the disadvantages of zinc oxide, a method of adding spherical silica, PMMA beads, or the like has been proposed.

Further, korean registered patent No. 10-0843190 discloses a method for producing nano zinc oxide powder by mixing an aqueous alkaline solution or the like with an acidic zinc salt precursor obtained by dissolving zinc oxide powder in an organic acid, and performing low-temperature ripening, lyophilization and washing, filtration and drying. However, the process disclosed in the above patent has the following disadvantages: not only is it too complicated to be cost competitive, but also the sphericity is not good for the size and particle morphology of the finally produced powder, and the variation in size of the particles is large.

Further, korean registered patent No. 10-1790697 discloses a method for producing zinc oxide particles by neutralizing an alkaline zinc precursor with hydrochloric acid or sulfuric acid and heat-treating the neutralized precursor. However, the process disclosed in the above patent uses hydrochloric acid or sulfuric acid, and thus has disadvantages of poor safety and non-uniform particle morphology.

In addition, with the recent increase in caution to human safety in the long-term use of cosmetic powders coated with artificial substances, cosmetic powders coated with natural substances are urgently required, and the development thereof is urgently needed.

Disclosure of Invention

Problems to be solved

The purpose of the present invention is to provide a natural-coated spherical zinc oxide powder which is excellent not only in ultraviolet-shielding effect but also in feeling of use, dispersibility, stability and safety to the human body, a method for producing the zinc oxide powder, and a cosmetic composition containing the zinc oxide powder.

Another object of the present invention is to provide a spherical zinc oxide powder which can be mass-produced in a simple process and has excellent cost competitiveness and natural materials uniformly coated, a method for producing the zinc oxide powder, and a cosmetic composition containing the zinc oxide powder.

Means for solving the problems

In order to achieve the above object, the present invention provides a natural material-coated spherical zinc oxide powder comprising: spherical zinc oxide powder having an Aspect ratio (Aspect ratio) of particles of 1 to 1.5; a TEOS coating layer coated by Tetraethyl Orthosilicate (TEOS) is arranged on the surface of the spherical zinc oxide powder; and a natural substance coating layer coated on the surface of the TEOS coating layer.

Preferably, the spherical zinc oxide powder has a major axis of 30 to 500 nm.

Specifically, the TEOS coating layer is 5 to 70 parts by weight with respect to 100 parts by weight of the spherical zinc oxide powder.

Specifically, the natural material coating layer is 5 to 70 parts by weight with respect to 100 parts by weight of the spherical zinc oxide powder.

Specifically, the natural material coating layer is formed by coating one or more materials selected from the group consisting of Lauroyl Lysine (Lauroyl Lysine), cocoa butter, lecithin, and Stearic acid (Stearic acid).

Further, the present invention provides a method for manufacturing a natural substance-coated spherical zinc oxide powder, comprising: a first step of mixing water and zinc oxide in a reactor, and then adding citric acid to dissolve the zinc oxide;

a second step of charging sodium hydroxide into the reactor of the first step along the wall surface of the reactor and stirring the mixture to form spherical zinc oxide particles having a major axis of 30 to 500nm and an aspect ratio of 1 to 1.5; a third step of performing TEOS coating on the zinc oxide particles of the second step; and a fourth step of coating the product of the third step with a natural substance.

Specifically, the sodium hydroxide is fed at a rate of 5 to 10ml/s in the second step.

Specifically, the natural material coating layer is formed by coating one or more materials selected from the group consisting of lauroyl lysine, cocoa butter, lecithin, and stearic acid.

The present invention also provides a cosmetic composition comprising the natural material-coated spherical zinc oxide powder.

Specifically, the content of the spherical zinc oxide powder is 1 to 25% by weight, and the cosmetic composition is used for ultraviolet isolation.

Effects of the invention

According to the spherical zinc oxide powder, the method for producing the zinc oxide powder, and the cosmetic composition containing the zinc oxide powder of the present invention, compared to conventional cosmetics containing potato-shaped or rod-shaped zinc oxide, there is an advantage that a high-quality cosmetic composition having excellent feeling of use and particle dispersibility can be realized, cost competitiveness can be improved by mass production, and safety to the human body can be remarkably improved by uniformly coating a natural substance.

Drawings

Fig. 1 is a schematic view showing a natural material coated spherical zinc oxide powder according to an embodiment of the present invention.

Fig. 2 is a schematic view showing a process of charging sodium hydroxide into a reactor after the first step is finished in the method for manufacturing a natural material coated spherical zinc oxide powder according to an embodiment of the present invention.

Fig. 3 is a photograph of a spherical zinc oxide powder coated with a natural substance according to an embodiment of the present invention.

FIG. 4 is a photograph of a zinc oxide powder according to a comparative example of the present invention.

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art to which the present invention pertains can easily carry out the invention with reference to the accompanying drawings. However, the present invention can be implemented in various different forms, and is not limited to the embodiments described herein. In the drawings, for the purpose of clearly explaining the present invention, portions not related to the explanation are omitted, and like reference numerals are given to like portions throughout the entire specification.

In the present invention, the term "includes" or "including" means that a component is included in the present invention, and the component is not excluded unless otherwise specified.

The present invention will be described in detail below.

The zinc oxide powder used as an inorganic ultraviolet ray-blocking agent in conventional cosmetic compositions has a disadvantage of poor feeling in use and dispersibility, because it is in the form of a potato or a stick coated with an artificial substance.

Unlike conventional zinc oxide powder, the present invention is characterized by providing spherical zinc oxide powder coated with a natural substance, which is excellent in safety to the human body even in long-term use, thereby significantly improving the feeling of use and dispersibility of the zinc oxide powder.

Fig. 1 is a schematic view showing a natural material coated spherical zinc oxide powder according to an embodiment of the present invention, fig. 2 is a schematic view showing a process of charging sodium hydroxide into a reactor after the end of a first step in a method for manufacturing a natural material coated spherical zinc oxide powder according to an embodiment of the present invention, and fig. 3 is a photograph of a natural material coated spherical zinc oxide powder according to an embodiment of the present invention.

The natural material-coated spherical zinc oxide powder 100 of the present invention is characterized by comprising: a spherical zinc oxide powder 10 having a particle aspect ratio of 1 to 1.5; a TEOS coating layer 20 formed by coating TEOS (tetraethyl orthosilicate) on the surface of the spherical zinc oxide powder 10; and a natural material coating layer 30 coated on the surface of the TEOS coating layer 20. When the aspect ratio of the particles is in the range of 1 to 1.5, the particles have the following characteristics: the TEOS coating layer 20 and the natural material coating layer 30 can be uniformly formed, and the use feeling is excellent when the composition is applied to cosmetics, which is advantageous for cleaning and improvement of dispersion.

Preferably, the spherical zinc oxide powder 10 has a major axis of 30 to 500 nm. Within the above range, the following features are provided: when applied to cosmetics, the product has excellent use feeling, is beneficial to cleaning, and improves the dispersivity.

In the present invention, the thicknesses of the TEOS 20 and the natural material 30 may be arbitrarily adjusted, and preferably, the TEOS 20 may be 5 to 70 parts by weight with respect to 100 parts by weight of the spherical zinc oxide powder 10, and the natural material 30 may be 5 to 70 parts by weight with respect to 100 parts by weight of the spherical zinc oxide powder 10. When within the above range, the following advantages are obtained: the TEOS coating layer 20 and the natural material coating layer 30 can be uniformly formed, and when the composition is applied to cosmetics, the use feeling is excellent, and the dispersion force is remarkably improved.

In the present invention, the natural substance coating layer 30 is not particularly limited as long as it is a natural substance, and the natural substance coating layer 30 may be formed by selecting it arbitrarily. Preferably, it is preferable to coat with one or more substances selected from the group consisting of lauroyl lysine, cocoa butter, lecithin and stearic acid, and in this case, there are advantages in that the feeling of use is excellent and the dispersing power is improved when applied to cosmetics.

Further, the present invention provides a method for manufacturing a natural substance-coated spherical zinc oxide powder, comprising: a first step of mixing water and zinc oxide in a reactor, and then adding citric acid to dissolve the zinc oxide; a second step of charging sodium hydroxide into the reactor of the first step along the wall surface of the reactor and stirring the mixture to form spherical zinc oxide particles having a major axis of 30 to 500nm and an aspect ratio of 1 to 1.5; a third step of performing TEOS coating on the zinc oxide particles of the second step; and a fourth step of coating the product of the third step with a natural substance.

Hereinafter, the procedure will be described.

First step of

First, a reactor was prepared in which water and zinc oxide were mixed. The zinc oxide is amorphous zinc oxide, and the size thereof is generally larger than 500nm, but the zinc oxide is not limited thereto.

Then, citric acid (C) was added thereto₆H₈O₇) Thereby dissolving the zinc oxide. The reason why citric acid is used in the present invention is that it is safe and can produce uniform spherical zinc oxide without concern of environmental pollution as compared with other strong acids such as hydrochloric acid and sulfuric acid. That is, in the case of using hydrochloric acid or sulfuric acid, there is a problem that it is difficult to form uniform particles and zinc oxide is made into a potato shape rather than a spherical shape, but the citric acid forms spherical zinc oxide particles uniformly.

By the first step, Zn is formed in the reactor₃(C₆H₅O₇)₂。

In this case, the mixing ratio of the water, zinc oxide and citric acid is not limited, and it is preferable to mix 500 to 2,000 parts by weight of water and 100 to 300 parts by weight of citric acid with respect to 100 parts by weight of zinc oxide. In this case, spherical zinc oxide having an aspect ratio of particles closer to 1 can be produced.

Second step of

Next, sodium hydroxide is fed into the reactor in which the reaction in the first step is completed along the wall surface of the reactor and stirred to form spherical zinc oxide particles having a major axis of 30 to 500nm and an aspect ratio of 1 to 1.5. In this case, the sodium hydroxide is preferably fed while stirring the reactor at 100 to 400rpm, and more specifically, the solution in the reactor in the first step is slowly reacted with the sodium hydroxide by slowly accelerating the stirring speed of the reactor from 100rpm to 400rpm and reducing the feeding speed of the sodium hydroxide from 10ml/s to 5 ml/s.

As shown in fig. 2, the sodium hydroxide is fed along the wall surface of the reactor to more slowly react with the solution in the reactor in the first step, and the feeding rate of the sodium hydroxide is decreased to provide a sufficient reaction time, thereby increasing the production amount of spherical zinc oxide.

In this case, the stirring time is preferably about 10 to 30 minutes, the stirring time is adjusted so that sufficient stirring can be achieved at a final stirring speed of 400rpm, and the temperature in the reactor during the stirring is preferably about 40 to 70 ℃.

The amount of the sodium hydroxide to be added may be about 50 to 300 parts by weight based on 100 parts by weight of the zinc oxide used in the first step, and it is needless to say that the sodium hydroxide may be diluted into an aqueous solution and used. However, the weight ratio of the sodium hydroxide is set based on pure sodium hydroxide before dilution.

By a second step, Zn in the reactor₃(C₆H₅O₇)₂Reacting with 2NaOH to form spherical particles with an aspect ratio of 1-1.5 and a particle size of 30-500 nm, namely Zn (OH)₂。

The third step

Next is a step of TEOS coating the zinc oxide particles of the second step described above. The TEOS coating can be performed by a known TEOS coating method. Specifically, the TEOS coating may be performed by mixing TEOS and ethanol at a weight ratio of 9:1 to 1:9 and applying the mixture to the zinc oxide particles in the second step. The reaction temperature can be 40-80 ℃ and the reaction time can be 5-20 hours during the coating. The TEOS content can be arbitrarily adjusted, and preferably 5 to 70 parts by weight per 100 parts by weight of the spherical zinc oxide powder. When within the above range, the following advantages are obtained: can form a natural substance coating layer uniformly, has excellent use feeling when being applied to cosmetics, and remarkably improves the dispersing power.

The fourth step

Next, a step of coating a natural substance on the surface of the TEOS coating layer of the spherical zinc oxide powder on which the TEOS coating layer is formed as a product of the third step is performed. The natural substance coating may be performed by a known natural substance coating method. Specifically, the reaction temperature may be 40 to 80 ℃ and the reaction time may be 5 to 20 hours in the above coating. Further, the above natural substances may be used as desired, and preferably, one or more substances selected from the group consisting of lauroyl lysine, cocoa butter, lecithin and stearic acid are coated. In this case, when the produced powder is applied to a cosmetic, the powder has advantages of excellent feeling in use and remarkably improved dispersibility.

Specifically, the natural substance coating may be performed by mixing one or more substances selected from the group consisting of lauroyl lysine, cocoa butter, lecithin, and stearic acid with isopropyl alcohol in a weight ratio of 9:1 to 1:9, and applying the mixture to a TEOS coating layer of the particles, which is the product of the third step. The content of the natural substance may be arbitrarily adjusted, and preferably, the content of the natural substance is 5 to 70 parts by weight with respect to 100 parts by weight of the spherical zinc oxide powder. When the amount is within the above range, the feeling in use when applied to a cosmetic is excellent, and the dispersibility is significantly improved.

In the method for manufacturing a spherical zinc oxide powder coated with a natural material according to the present invention, the method may further include a step of heating the reactor to dehydrate the particles, optionally after the second step and before the third step or after the fourth step. The heating may be carried out at 90 to 100 ℃ for 8 to 24 hours after the stirring speed is reduced to 150 to 200 rpm. By such steps, a reaction from Zn (OH) is thereby achieved in the reactor₂And (4) dehydrating.

The dehydrated powder is dried by a generally known method to complete the production.

As described above, the natural-material-coated spherical zinc oxide powder produced by the above method has an aspect ratio of 1 to 1.5, and therefore has an advantage that it is superior in use feeling and particle dispersibility when applied to cosmetics and can realize high-quality cosmetics, as compared with conventional potato-shaped or rod-shaped zinc oxide.

The spherical zinc oxide powder of the present invention can be contained as an active ingredient in a cosmetic composition, can be applied to various cosmetic applications regardless of the form of cream, lotion, powder, etc., and is most preferably used as an ultraviolet screening agent or calamine.

The content of the spherical zinc oxide powder can be arbitrarily adjusted in the cosmetic composition, and specifically, the content may be 1 to 25% by weight with respect to the whole cosmetic composition.

Hereinafter, preferred examples are provided to facilitate understanding of the present invention, and the following examples merely illustrate the present invention, and the scope of the present invention is not limited to the following examples.

[ example 1]

1000g of water, 200g of amorphous zinc oxide, and 400g of citric acid were mixed and dissolved in a reactor with stirring. In the above reactor, 350g of NaOH (700 g of NaOH diluted at 50% by weight) was charged into the reactor along the wall surface of the reactor as shown in FIG. 2. When NaOH was charged as described above, the stirring speed of the reactor was gradually increased from 100rpm to 400rpm over 10 minutes, and the charging speed of sodium hydroxide was gradually decreased from 10ml/s to 5ml/s at a rate of 0.05ml per 1 second. And, it was further stirred at 400rpm as a final stirring speed for 10 minutes so that the total stirring time was 20 minutes. At this time, the stirring temperature was 60 ℃。

Subsequently, the stirring speed of the reactor was reduced to 150rpm, and then dehydration reaction was carried out at 95 ℃ for 24 hours.

Then, 40g of TEOS and 40g of ethanol were mixed and put into the reactor, and the reaction was carried out at 60 ℃ for 12 hours.

Next, 12g of lauroyl lysine was dissolved in 40g of isopropyl alcohol and put into the reactor, and after 12 hours of reaction at 60 ℃, dehydrated, and dried by a vacuum dryer at 125 ℃ until the moisture content in the powder was 2% or less, thereby producing a natural substance-coated spherical zinc oxide powder.

[ example 2]

Spherical zinc oxide powder coated with cocoa butter was produced in the same manner as in example 1, except that in example 1, cocoa butter was used instead of lauroyl lysine.

[ example 3]

Spherical zinc oxide powder coated with lecithin was produced in the same manner as in example 1, except that lecithin was used instead of lauroyl lysine in example 1.

[ example 4]

Spherical zinc oxide powder coated with stearic acid was produced in the same manner as in example 1, except that stearic acid was used instead of lauroyl lysine in example 1.

Comparative example 1

Zinc oxide powder was produced in the same manner as in example 1 above, using HCl instead of citric acid, and NaOH, when charged, not along the wall surface of the reactor as in the case of the method of fig. 2, but directly charged, and with respect to the stirring state, the stirring speed was rapidly accelerated from a static state over 10 seconds to 350rpm, 40g of isopropyl alcohol and 12g of octyltriethoxysilane were charged without TEOS coating, and after 12 hours of reaction at 60 ℃, dehydration was carried out, and the powder was dried by a vacuum dryer at 125 ℃ until the moisture content in the powder became 2% or less, thereby producing zinc oxide powder.

[ test example 1]

The morphology and size of the particles were confirmed by SEM photographs of the particles produced in example 1 and comparative example 1. FIG. 3 is an SEM photograph of example 1, and FIG. 4 is an SEM photograph of comparative example 1.

As shown in FIG. 3, it was confirmed that the zinc oxide powder of example 1 was spherical, the aspect ratio was in the range of 1 to 1.5, and the transverse and longitudinal diameters of the particles were 100 to 500 nm. On the other hand, as shown in fig. 4, it was confirmed that the zinc oxide powder of comparative example 1 was substantially potato-shaped.

Production example 1 and comparative production example 1

Cosmetic compositions for ultraviolet screening agents were prepared from the powders of example 1 and comparative example 1 at the ratios shown in table 1 below. In this case, the production method follows a generally known method.

[ Table 1]

Composition ratio (wt%) of production example 1 and comparative production example 1

Distinguishing	Production example 1	Comparative production example 1
			Glycerol	5.0	5.0
Acryloyldimethyl ammonium taurate/VP copolymer	1.0	1.0
			Behenyl alcohol	0.5	0.5
Polysorbate 60	0.5	0.5
			Myristic acid isopropyl ester	10.0	10.0
Polydimethylsiloxane	6.0	6.0
			Example 1	20.0	-
Comparative example 1	-	20.0
			Refined water	To 100	To 100

[ test example 2]

The white turbidity and the feeling of use of the production example 1 and the comparative production example 1 were examined.

With respect to the above white turbidity, an opaque paper was left to stand, and after each sample was coated with 0.1g, the sample was pushed open by a baker applicator (baker applicator) and the result was measured by a japanese electrochromatometer (NIPPON DENSHOKU COLOR METER) ZE 2000.

In the evaluation of feeling of use, the skin feel and the skin adhesiveness were evaluated on a 10-point scale with 50 subjects as subjects, and the average value was used. The results are shown in table 2 below.

[ Table 2]

Test example 2 results

Distinguishing	Production example 1	Comparative production example 1
			White turbidity	15.0	20.5
Feeling of use	9.6	7.0

As can be seen from table 2, the spherical zinc oxide powder coated with a natural product of example 1 of the present invention has a lower degree of white turbidity and a significantly improved feeling in use than the potato-shaped zinc oxide powder of comparative example 1.

Although the present invention has been described with reference to the above embodiments and the accompanying drawings, different embodiments may be constructed within the concept and scope of the present invention. The scope of the invention is, therefore, indicated by the appended claims and their equivalents, and is not limited to the specific embodiments described in this specification.