JPH01224220A - Titanium oxide-coated substance and cosmetic - Google Patents

Abstract

PURPOSE:To improve adhesion to substrates and properties of forming dense titanium oxide films and contrive useful application to cosmetics, by treating a gel or sol of hydrous titanium oxide with hydrogen peroxide and heating the resultant aqueous solution of titanic acid in the presence of an inorganic substrate. CONSTITUTION:Hydrogen peroxide in an amount so as to provide 1-6, preferably 2-6 ratio of H2O2/TiO2 is added to a sol or gel containing titanium hydroxide (in <=10wt.%, preferably <=5wt.% TiO2 concentration) to afford an yellow transparent or semitransparent aqueous solution of titanic acid in 5-20hr. An inorganic substrate or inorganic powder (the average particle diameter is suitably selected according to uses) is added to the above-mentioned aqueous solution and the resultant mixture solution is heated at >=60 deg.C, preferably >=80 deg.C to afford a titanium oxide-coated substance. The titanium oxide is used for coating in an amount so as to provide a weight ratio TiO2/substrate of preferably <=2, especially more preferably within the range of 0.01-1.5.

Description

[Detailed Description of the Invention] 1. The present invention provides a novel titanium oxide coating whose surface is coated with titanium oxide and a powdery inorganic substrate whose surface is coated with titanium oxide. The present invention relates to cosmetics containing titanium oxide coated particles.

Titanium oxide has a high refractive index and also has excellent properties such as ultraviolet blocking power, so it is widely used as various pigments, fillers, etc. by taking advantage of these properties. For example, platy minerals such as mica are coated with titanium oxide and used as pigments or fillers for paints.Such pigments or fillers are
Titanium oxide has a high refractive index and also has excellent UV-blocking properties, so it has a pearl-like luster, and paints containing such pigments or fillers also have excellent UV-blocking properties. .

Further, by coating spherical silica powder with titanium oxide, a white pigment with good dispersibility can be obtained, and such a white pigment can be used as a pigment for cosmetics or a pigment for cosmetics.

Titanium oxide coatings, which are used for various purposes as described above, basically consist of an inorganic base material and titanium oxide that coats the surface of this inorganic base material. There are two methods: dry method and wet method.

Here, a typical example of a dry method is the vacuum evaporation method, but the cost of titanium oxide coatings obtained using such a dry method is extremely high, so special It is rarely used except for special purposes.

Therefore, the common coating method is a wet method, in which a titanium salt aqueous solution such as titanyl sulfate or titanium chloride is prepared, and the coating substrate is suspended in the titanium salt aqueous solution. The titanium salt is hydrolyzed by heating this suspension, and the titanium oxide produced by the hydrolysis is deposited on the surface of the coating substrate. Publication, Japanese Patent Publication No. 56-29708, Japanese Patent Publication No. 50-39
(See Publication No. 738, Japanese Unexamined Patent Publication No. 195169/1983)
.

However, these conventional methods cannot be used to coat substrates that do not have definition properties because titanium salt aqueous solutions exhibit strong acidity. However, the adhesion of titanium oxide to the base material and the density of the precipitated titanium oxide are not necessarily satisfactory. It would be desirable to develop a coating having layers. - 1. The present invention aims to solve the problems associated with the prior art as described above, and is a novel method that has excellent adhesion to the base material and is coated with dense titanium oxide. The object is to provide a titanium oxide coated body.

Still another object of the present invention is to provide a novel cosmetic product containing titanium oxide-coated particles that have excellent adhesion to a powdered inorganic base material and are coated with dense titanium oxide.

The titanium oxide coated body according to the present invention is a titanium oxide coated body consisting of an inorganic base material as a base material and titanium oxide that coats the surface of the base material. Titanium oxide is precipitated on the surface of the base material by heating an aqueous titanic acid solution obtained by adding hydrogen peroxide to a hydrous titanium oxide gel and/or sol in the coexistence of the inorganic base material. It is characterized by being made of titanium oxide.

Furthermore, the cosmetic according to the present invention is a cosmetic containing a titanium oxide coated powder in which the surface of the inorganic powder is coated with titanium oxide, wherein the titanium oxide coating the surface of the inorganic powder is formed into a hydrous titanium oxide gel and/or sol. Add the titanic acid aqueous solution obtained by adding hydrogen peroxide to the! In the coexistence of i-machine powder,
It is characterized by being titanium oxide precipitated on the surface of the inorganic powder by heating.

The titanium oxide coated body according to the present invention has good adhesion between the titanium oxide and the inorganic base material because the titanium oxide that coats the surface of the inorganic base material is titanium oxide precipitated from a specific titanic acid aqueous solution. Because it has a dense structure, it is extremely strong.

Furthermore, the cosmetic product according to the present invention includes a titanium oxide coated powder in which the surface of the inorganic powder is coated with titanium oxide, which has excellent adhesion as described above, is high in strength, and has excellent density. Therefore, it has a very good feeling of use and can also be used as a sunscreen cosmetic due to the ultraviolet blocking effect of titanium oxide.

Ninety-five αl stop boiling j The present invention will be specifically explained below.

The titanium oxide coating according to the present invention basically consists of an inorganic base material and titanium oxide covering the surface of this base material.

In the present invention, the titanium oxide coating the surface of the inorganic base material is titanium oxide precipitated on the surface of the base material by heating a specific titanic acid aqueous solution under conditions in which the base material coexists. The main feature is that.

The titanium/acid aqueous solution used for coating the surface of an inorganic substrate in the present invention can be obtained by adding hydrogen peroxide to a hydrous titanium oxide gel or sol to dissolve the hydrous titanium oxide.

That is, a hydrous titanium oxide gel or sol is prepared by a conventionally known method. Hydrous titanium oxide gel is obtained, for example, by adding an alkali to an aqueous solution of titanium salts such as titanium chloride and titanyl sulfate for neutralization. Hydrous titanium oxide sol can also be obtained by passing an aqueous solution of titanium salt through an ion exchange resin to remove residual ions.

In addition, in order to prepare the hydrous titanium oxide sol or gel, not only the above method but also a wide variety of conventionally known methods can be used. The term "hydrated titanium oxide" as used herein is a general term that includes titanium oxide hydrate or titanium hydroxide obtained by the method described above.

Next, hydrogen peroxide is added to the hydrated titanium oxide sol, gel, or mixture thereof obtained as described above to dissolve the hydrated titanium oxide to prepare a homogeneous aqueous solution. At this time, the reaction can be heated to about 50°C or higher if necessary, and it is preferable to carry out this reaction while stirring.In addition, at this time, if the concentration of hydrated titanium oxide becomes too high, the hydrated titanium oxide may dissolve. Ti
It is desirable that the O□ concentration be about 10% by weight or less, preferably about 5% by weight or less.

Also, the amount of hydrogen peroxide to be added is H202/T10
When the weight ratio of 2 is 1 or more, hydrous titanium oxide can be completely dissolved.

If the above HO/TiO2 ratio is less than 1, the hydrous titanium oxide will not be completely dissolved and unreacted gel or sol will remain, which is undesirable. The speed is high and the reaction is completed in a short time, but if too much hydrogen peroxide is used, a large amount of unreacted hydrogen peroxide will remain in the system, which is undesirable as it will adversely affect the next process. .

The applied force, H202/TIO2 ratio is 1 to 6,
It is preferable to use hydrogen peroxide in an amount of about 2 to 6. When hydrogen peroxide is used in such an amount, hydrated titanium oxide is usually completely oxidized at 0° in about 5 to 20 hours. By dissolving it, a yellow transparent or translucent titanic acid aqueous solution can be obtained.

The titanic acid aqueous solution prepared in this way is generally
It has a pH value of 12 and is very stable. Therefore, depending on the type of substrate used when heating and hydrolyzing this titanic acid aqueous solution, the pH is usually set within the range of 3 to 12.
The value can be adjusted and used.

The titanic acid aqueous solution prepared in this way can be used as is, but the concentration of the titanic acid aqueous solution should be adjusted in consideration of the intended use of the resulting titanium oxide coating, the precipitation temperature of titanium oxide, the heating time, etc. You can also do that.

In particular, in the present invention, it is preferable to adjust the TiO2 concentration in the titanic acid aqueous solution to about 0.1 to 10% by weight.

Titanium oxide is precipitated on the surface of the inorganic base material by heating the titanic acid aqueous solution obtained in this manner in the presence of the inorganic base material.

In the present invention, various inorganic base materials can be used depending on the use of the titanium oxide coated body to be obtained.

The inorganic base material used in the present invention is
Preferably, inorganic compounds containing elements included in Group 1, Group 1, Group 2, Group V, Group 2, and Group 1 are preferred. Examples of inorganic compounds containing such elements include mica, talc, kaolin, etc. , glass flakes, gypsum, calcium carbonate, alumina, silica, alumina-silica, zinc oxide, zirconium oxide and iron oxide.

The shape of these inorganic base materials can be appropriately selected according to the purpose, and may be, for example, flaky, spherical, or fibrous powder, or an aggregate of inorganic substances in these shapes. Alternatively, a molded body can also be used.

There is no particular restriction on the size of these inorganic base materials; for example, a plate-shaped inorganic base material may be immersed in the above titanic acid aqueous solution to deposit titanium oxide on the surface of this plate-shaped inorganic base material. can.

In particular, when the titanium oxide coating according to the present invention is blended into a transparent dispersant and used for the purpose of efficiently blocking ultraviolet rays without impairing transparency, the average particle diameter of the coating is 80 mμ. Hereinafter, it is preferable to use an inorganic powder having a particle diameter of preferably 10 to 50 mμ.

In addition, when the titanium oxide coating is used for applications that require hiding power, such as foundation bases or pigments for cosmetics, the average particle diameter of the coating is 0.1 to 30.
It is desirable to use an inorganic powder with a diameter of μm.

By heating the above titanic acid aqueous solution in the presence of the above base material, titanium oxide is precipitated from the titanic acid aqueous solution! ! Coat the surface of the machine material or machine powder.

Specific methods for coating the surface of an inorganic substrate with titanium oxide include a method in which the amount of titanium oxide to be coated is calculated in advance, a titanic acid aqueous solution corresponding to this amount is mixed with the inorganic substrate, and then heated; A portion of the acid aqueous solution and the entire inorganic base material are mixed and heated to form a thin layer of titanium oxide on the surface of the base material, and then the remaining titanic acid aqueous solution is added to further form a titanium oxide layer on this thin layer. and a method in which a titanic acid aqueous solution is added little by little to a suspension or dispersion of an inorganic base material while heating to gradually precipitate titanium oxide on the surface of the base material.

The heating temperature of the titanic acid aqueous solution may be at least the temperature at which the titanium compound dissolved in the titanic acid aqueous solution is hydrolyzed and precipitated, and usually the titanic acid aqueous solution is heated at 60°C or higher.
Preferably, it is desirable to heat to 80°C or higher.

By doing the above, the titanium compound dissolved in the titanic acid aqueous solution precipitates as titanium oxide, and this precipitated titanium oxide! ! Coat the surface of equipment materials. Since the precipitated titanium oxide is very fine particles, it has good adhesion to the surface of the inorganic substrate and coats the surface of the inorganic substrate uniformly and densely.

Furthermore, the amount of titanium oxide coated (weight) in the titanium oxide coated body of the present invention varies depending on the type, particle size, shape, specific gravity, surface area, etc. of the inorganic base material used, so the coating weight should be set appropriately taking these into consideration. be able to.

However, in the present invention, TiO□/base material (weight ratio)
is preferably set to about 2 or less, and more preferably 0.01
It is particularly preferable to set it within the range of 1.5 to 1.5.

After coating with titanium oxide in this manner, the titanium oxide coated body is usually separated from the aqueous solution by P, washed, and then dried to obtain the titanium oxide coated body according to the present invention. Further, the titanium oxide coated body obtained in this manner can be used after being fired, if necessary.

In particular, by coating the mica surface with titanium oxide as described above and firing it, a titanium oxide coated body having pearlescent luster can be obtained. In this case, the firing temperature is set within the same range as for conventional pearl pigments. .

The titanium oxide of the titanium oxide coated body obtained without firing or by firing as described above has anatase type crystals that grow relatively well and precipitates as very v1 fine crystals. The titanium oxide coating the material is thought to form a very dense layer.

Next, the cosmetics according to the present invention will be explained in more detail.

In the cosmetics according to the present invention, the surface of the inorganic powder as a base material is
By heating a titanic acid aqueous solution obtained by adding hydrogen peroxide to a hydrous titanium oxide gel and/or sol in the presence of the inorganic powder, the surface of the inorganic powder is coated with precipitated titanium oxide. Contains titanium oxide coated powder.

That is, in the titanium oxide coated powder blended into the cosmetics according to the present invention, the surface of the inorganic powder is coated with titanium oxide precipitated from a specific titanic acid aqueous solution.

Depending on the average particle size of the powder of the coating, it is possible to produce transparent cosmetics and concealing cosmetics.

For example, the average particle diameter is 80 mμ or less, preferably 10 to
Cosmetics containing 50 mμ titanium oxide coated powder in a transparent base can efficiently block ultraviolet rays without impairing transparency, so they can be used as cosmetics with sunscreen effects.

Further, a titanium oxide coated powder having an average particle diameter of 0.1 to 30 μm has very good hiding power and can be used, for example, as a foundation base.

Furthermore, by blending flaky inorganic powder with titanium oxide coated powder with a length of 0.1 to 50 μm and a thickness of 0.01 to 3 μm, it has good adhesion to the skin, spreads easily, and reduces makeup removal. You can get cosmetics.

Cosmetics using such titanium oxide coated powder can be used by blending into powder, cake, stick, emulsion, and liquid cosmetics, and in particular, they can be blended into solid foundations and emulsified foundations. It is preferable to use the

In the cosmetics according to the present invention, the titanium oxide coated powder is
TiO□ is usually 0.0 based on the total weight of cosmetics.
It can be used in an amount of 5% by weight or more, preferably 0.1 to 70% by weight.

In the cosmetics according to the present invention, other ingredients constituting the cosmetics together with the titanium oxide coated powder vary depending on the form of the cosmetics, but include, for example, kaolin, calcium carbonate, sericite, talc, zinc white, and metallic soap. Powder ingredients, pigments such as iron oxide, fatty acids, fatty acid esters,
A solid foundation can be produced by blending oily agents such as higher alcohols and aliphatic hydrocarbons, surfactants, fragrances, etc., and molding using a method such as press molding. Furthermore, an emulsified foundation can be produced by emulsifying or dispersing the titanium oxide coated powder in water together with the above-mentioned components. Furthermore, for example, a lipstick or the like can be manufactured by kneading titanium oxide coated powder, pigment, fragrance, etc. into a solid oily component such as beeswax or paraffin wax.

Cosmetics manufactured in this way have a light feel when used because they contain titanium oxide coated powder, and for example, in the case of solid foundations, the foundation spreads easily and the foundation does not stick to bare skin. Moreover, it is difficult to get makeup streaks after applying makeup.Furthermore, despite the fact that the foundation adheres well, it can be easily removed (cleansed) by using, for example, watercress cream. )can do.

Furthermore, since the cosmetic product according to the present invention contains the titanium oxide coated powder, the titanium oxide in the powder blocks ultraviolet rays, so that it also has the effect of preventing sunburn.

The titanium oxide coating according to the present invention can be used as an additive for plastics, for example, by making use of its hiding power and ultraviolet shielding effect, in addition to being used by blending it into the above-mentioned cosmetics. By using such plastics, for example, as a backlight board for automobile dash board meters, the instruments become extremely easy to read.

Furthermore, by incorporating the titanium oxide coating according to the present invention into a plastic film for food packaging, ultraviolet rays can be blocked without impairing the transparency of the film.
Deterioration of food freshness can be effectively prevented.

Furthermore, the titanium oxide coating, which is obtained by coating the surface of a porous inorganic base material with titanium oxide, can be used as a catalyst by itself, and by supporting other catalyst components, it can be used as a very good titanium oxide based material. In addition to being a catalyst, it also serves as a good catalyst carrier.

1. The titanium oxide coated body according to the present invention has a structure in which the titanium oxide coating the surface of the inorganic base material is titanium oxide precipitated from a specific titanic acid aqueous solution. It has good properties, high strength, and a dense structure.

Furthermore, by coating the surface of a flaky base material such as mica with titanium oxide, it is possible to obtain a pigment that has superior pearlescent luster compared to conventional pearl pigments.

Furthermore, the cosmetic product according to the present invention includes a titanium oxide coated powder in which the surface of the inorganic powder is coated with titanium oxide, which has excellent adhesion as described above, is high in strength, and has excellent density. Therefore, it has a very good feeling of use and can also be used as a sunscreen cosmetic due to the ultraviolet ffl blocking effect of titanium oxide.

Next, the present invention will be explained with reference to examples, but the present invention is not limited to these examples.

Titanyl sulfate was dissolved in pure water to obtain an aqueous titanyl sulfate solution having a titanium content of 2.0% by weight in terms of T i O2. Gradually add 15% ammonia water to this aqueous solution,
A white slurry liquid with pH 8.5 was obtained. This slurry was filtered and washed to obtain a cake of hydrous titanium oxide gel having a solid content concentration of 11% by weight.

35% to 4.55 kg of this hydrous titanium oxide gel cake
After adding 3.57 kg of hydrogen peroxide solution and 4.4 ktr of pure water, the mixture was heated at 85°C for 3 hours to obtain a titanic acid aqueous solution with a titanium content of 4.0% by weight in terms of T i O2 12. 5
I got kr. This titanic acid aqueous solution is yellowish brown and transparent with DH
was 7.6.

Next, 500 g of talc powder having a shape of 0.1 to 0.2 μm in thickness and 2 to 10 μm in major axis and the above titanic acid aqueous solution 12
．． After mixing 5 kr, it was heated at 95° C. for 96 hours.

The suspension was initially pale yellowish white, but turned white after 96 hours. After filtering this and washing the solid content, 110
Dry at °C. The solution V obtained by filtration was clear and colorless.

The titanium oxide-coated talc thus obtained was a white powder with excellent hiding power. In addition, when the surface condition of this powder was observed with a scanning electronics fa 3tA, it was found that
It was found that a smooth coating layer with few irregularities was formed.

The X-ray diffraction diagram of this titanium oxide-coated talc is shown in FIG. 1. As is clear from FIG. It turns out that it is titanium.

An aqueous solution of titanyl sulfate having a titanium concentration of 5% by weight in terms of TlO2 was prepared, and this aqueous solution was mixed with 500 g of the same talc powder as used in Example 1.

This suspension was heated to boiling, and this state was continued for 2.5 hours. After 2.5 hours, cooled, filtered and washed, then heated to 110°C.
This was dried to obtain talc whose surface was coated with titanium oxide.

When the obtained talc was observed with a scanning electron microscope, it was found that
Particulate titanium oxide was present on the surface of the talc, and irregularities that followed the shape of the titanium oxide were observed on the talc surface.

The X&1 diffraction pattern of the talc coated with titanium oxide is shown in FIG. 2. As is clear from FIG. 2, the titanium oxide on the surface of this talc is Compared to titanium oxide, it can be seen that the growth of anatase crystals is less.

Fire 1 Self-milk λ In Example 1, instead of talc powder, average particle size 2
0mμ alumina fine particles (Aluninul manufactured by Degussa)
Titanium oxide-coated alumina fine particles were obtained in the same manner as in Example 1, except that Oxide C) was used at +r for 1.4.

10 parts of the titanium oxide-coated alumina fine particles were sufficiently dispersed in 90 parts of liquid paraffin using a homomixer to obtain a fluid.

This fluid was applied to a transparent quartz plate to a coating thickness of 5 μm.

This transparent quartz plate was loaded into a spectrophotometer (model 330 manufactured by Hitachi, Ltd.), and the absorbance of ultraviolet rays in the wavelength range of 280 to 400 nm and the transmittance of light rays in the wavelength range of 400 to 700 nl were measured.

The results are shown in FIGS. 3 and 4.

As is clear from FIGS. 3 and 4, the titanium oxide-coated alumina fine particles exhibit a good ultraviolet shielding effect and have excellent transparency.

When the titanic acid aqueous solution obtained in Example 1 was diluted with pure water,
i Titanic acid aqueous solution with O28 degree of 1% by weight 2.2ks
I got r.

Mica (Y-10 manufactured by Yamada Mining Co., Ltd.) was added to this titanic acid aqueous solution.
00M) was added and suspended.

This aqueous solution was heated at 130° C. for 8 hours, filtered, washed, and dried at 110° C. to obtain titanium oxide-coated mica.

This titanium oxide-coated mica was fired at 400°C for 3 hours to obtain a pearlescent material with pearlescent luster.

K1 Transparent A Using the titanium oxide-coated talc obtained in Example 1, a solid foundation having the following composition was manufactured.

(1) Titanium oxide coated barrel 2 15.0% by weight (2
) Sericite 45.0% by weight (3
) Talc 30.0% by weight (4
) Iron oxide pigment (red) 1.4% by weight (5) Iron oxide pigment (black) 0.2% by weight (6) Iron oxide pigment (yellow) 2.9% by weight (7) Isostearyl alcohol 2.0% by weight %(8
) Lanolin 2.0ffiJi%
(9) Sorbitan fatty acid ester 0.5% by weight (1
0)) Reethanolamine 1.0% by weight (
11) Perfume: The method for producing the appropriate amount is as follows.

First, lanolin, sorbitan fatty acid ester, triethanolamine, and fragrance were heated to 70° C. and mixed to obtain a liquid mixture.

Separately, titanium oxide-coated talc, sericite, talc, and iron oxide pigments (red, black, yellow) were mixed to obtain a powder mixture. - Then, the obtained liquid mixture and powder mixture are thoroughly mixed, and this mixture is press-molded to obtain a solid foundation (Sample A).

- A solid foundation was obtained in the same manner as in Example 4, except that commercially available titanium oxide fine particles (P-25 manufactured by Degussa) were used in place of the titanium oxide-coated talc (Sample B).
).

Sample A obtained in Example 4 and Sample B obtained in Comparative Example 2
A panel test was conducted using

The results are shown in Table 1.

From Table 1, it can be seen that when compared with the foundation of Sample B, the foundation of Sample A has a lighter makeup effect, has better adhesion to bare skin, and is less likely to come off. Furthermore, the removability of foundation using cleansing cream is also excellent. In addition, a certain degree of effectiveness was observed in preventing sunburn.

E1 and 2 Using the titanium oxide-coated alumina fine particles obtained in Example 2, an emulsified foundation having the following composition was manufactured by the following method.

(1) Titanium oxide coated alumina fine particles 10.0% by weight (
2) Titanium oxide pigment 5.0% by weight (3
) Iron oxide pigment 3.0% by weight (4) Stearic acid 0.4% by weight (5) Isopropyl myristate 4.0% by weight (6) Isostearizic acid 0.3% by weight (7) Squalane 1460% by weight (8) Cetyl alcohol 0.3% by weight (9%) Propylene glycol 5.0% by weight (10) Triethanolamine 0.4% by weight (11) Preservative
Appropriate amount (12) Purified water
57.2 weight 1% (13) Fragrance
Appropriate amount of ingredients (4) to (8)
After heating and dissolving at 5°C, (1) to (
Add the ingredients in 3) and disperse them evenly.

Next, components (9) to (12) were added to this dispersion at 85°
The mixture was heated and dissolved in C and gradually added to emulsify.

After adding ingredients (9) to (12), stir and cool to 45°
The temperature was adjusted to 35°C, and (13) was added thereto, and the mixture was stirred and cooled to 35°C to obtain an emulsified foundation.

By using the obtained foundation, it has a transparent finish, spreads well, and has UV shielding effect.
It also has excellent light resistance.

[Brief explanation of the drawing]

FIG. 1 is an example of an X-ray diffraction diagram of the titanium oxide-coated talc according to the present invention obtained in Example 1. FIG. 2 is an example of an X-ray diffraction diagram of talc whose surface is coated with titanium oxide obtained in Comparative Example 1. Figure 3 shows titanium oxide coated alumina fine powder with 280-4
3 is a graph showing an example of absorbance of ultraviolet rays in a wavelength range of 00 nn. Figure 4 shows titanium oxide coated alumina fine powder with 400-7
3 is a graph showing an example of transmittance of light in a wavelength region of 00 nil. Agent Patent Attorney Suzuki Part 3 Wavelength (nm) Figure 4 Wavelength (nm)

Claims (2)

[Claims] (1) A titanium oxide coating consisting of an inorganic base material and titanium oxide covering the surface of the base material, wherein the titanium oxide covering the surface of the base material is a hydrous titanium oxide gel and/or
Or a titanium oxide coated body, characterized in that it is titanium oxide precipitated on the surface of the base material by heating an aqueous titanic acid solution obtained by adding hydrogen peroxide to a sol in the presence of the inorganic base material. . (2) A cosmetic containing a titanium oxide coated powder whose inorganic powder surface is coated with titanium oxide, wherein the titanium oxide coating the inorganic powder surface is obtained by adding hydrogen peroxide to hydrous titanium oxide gel and/or sol. A cosmetic product characterized in that titanium oxide is precipitated on the surface of the inorganic powder by heating an aqueous titanic acid solution obtained by heating the obtained titanic acid aqueous solution in the presence of the inorganic powder.