JPH0529363B2 - - Google Patents

Description

[Detailed description of the invention]

TECHNICAL FIELD OF THE INVENTION The present invention relates to a cosmetic composition containing a titanium oxide/cerium oxide composite sol having excellent dispersibility in a dispersion medium, long-term stability, light resistance, etc. and having an excellent ultraviolet shielding effect. Technical background of the invention and its problems Titanium oxide is used as a compounding agent or surface coating agent for plastics etc. by utilizing its ultraviolet shielding power or high refractive index, and it is also blended into cosmetic base materials to have an ultraviolet shielding effect. It is used in the production of cosmetics with The titanium oxide used in these applications is preferably in the form of ultrafine particles, and in particular colloidal titanium oxide (titanium oxide sol) is preferred from the viewpoint of dispersibility in a medium, stability, and the like. As such a titanium oxide sol, the present inventors have developed a titanium oxide sol with various characteristics not found in conventional titanium oxide sols under the title ``Titanium oxide sol and method for producing the same.''
(Japanese Patent Application Laid-Open No. 63-229139). By the way, titanium oxide fine particles that are added to cosmetics to provide an ultraviolet shielding effect are generally in the form of powder. However, conventionally known titanium oxide powders are difficult to uniformly disperse in cosmetic base materials, and therefore have poor ultraviolet shielding effects. Furthermore, when titanium oxide powder as described above was blended into a lotion, there were problems with dispersibility and stability, such as particles gradually settling. In order to solve these problems, the present applicant proposed a cosmetic composition containing fine particles of a composite of titanium oxide, silicon oxide, and/or zirconium oxide, as disclosed in Japanese Patent Application No. 172293/1983 −270620
(No.). However, the titanium oxide composite fine particles described above have an excellent shielding effect on ultraviolet rays in the wavelength range of 280 to 320 nm (UV-B region), but they have an excellent shielding effect on ultraviolet rays in the wavelength range of 280 to 320 nm (UV-B region), but There was a problem in that it did not show a sufficient shielding effect against ultraviolet rays in the 380 nm wavelength range (UV-A range). Purpose of the Invention The present invention aims to solve the above-mentioned problems with titanium oxide sol, and provides a titanium oxide/cerium oxide composite sol that has excellent shielding ability against ultraviolet rays in the UV-A region. The purpose of the present invention is to provide a cosmetic containing an excellent ultraviolet shielding effect. Summary of the Invention The cosmetic according to the present invention is produced by adding hydrogen peroxide to a dispersion of hydrated titanium oxide and hydrated cerium oxide to dissolve the hydrated titanium oxide and hydrated cerium oxide, and then dissolving the hydrated titanium oxide and hydrated cerium oxide. It is characterized by containing titanium oxide/cerium oxide sol obtained by heating. Specific description of the invention Titanium oxide used in the cosmetics according to the present invention.
A method for producing a cerium oxide composite sol will be explained. First, in the present invention, a mixed gel or sol of hydrated titanium oxide and hydrated cerium oxide, or a co-precipitation gel or sol of both is prepared. A mixed gel of hydrated titanium oxide and hydrated cerium oxide is, for example, a hydrated titanium oxide gel obtained by neutralizing and hydrolyzing an aqueous solution of a titanium salt such as titanium chloride or titanyl sulfate, and a cerium salt such as cerium nitrate. It is obtained by mixing with hydrated cerium oxide gel obtained by hydrolysis. Also,
It is also possible to prepare a hydrated titanium oxide gel or a hydrated cerium oxide gel in advance and add a cerium salt aqueous solution or a titanium salt aqueous solution thereto for neutralization and hydrolysis to obtain a mixed gel. Further, the mixed sol can be obtained by peptizing the mixed gel prepared by the method described above with an acid such as nitric acid or hydrochloric acid. A coprecipitated gel of hydrated titanium oxide and hydrated cerium oxide is obtained by neutralizing and hydrolyzing a mixed aqueous solution of a titanium salt and a cerium salt. Furthermore, a sol can be obtained by peptizing this coprecipitated gel with acid. These mixed gels or sols, or coprecipitated gels or sols can be prepared not only by the above-mentioned method but also by conventionally known methods. In this specification, "hydrated titanium oxide" and "hydrated cerium oxide" are general terms including titanium oxide, hydrates of cerium oxide, titanium hydroxide, and cerium hydroxide. The ratio of titanium oxide to cerium oxide in the gel or sol obtained by these methods is preferably adjusted so that the CeO ₂ /TiO ₂ (weight ratio) in the final product is at least 0.1. _CeO2 / _TiO2
(weight ratio) less than 0.1, the effect of adding cerium oxide may not be effectively expressed. Furthermore, if the proportion of cerium oxide increases, it may become difficult to dissolve with hydrogen peroxide in the next step, so the CeO ₂ /TiO ₂ (weight ratio) is preferably about 20 or less. Next, hydrogen peroxide is added to the gel and/or sol obtained by the above method to dissolve hydrated titanium oxide and hydrated cerium oxide to prepare a homogeneous aqueous solution. At this time, it is preferable to heat to 50°C or higher. The amount of hydrogen peroxide added is _H2
If O ₂ /(TiO ₂ +CeO ₂ ) (weight ratio) is 1 or more, hydrated titanium oxide and hydrated cerium oxide can be completely dissolved. H ₂ O ₂ / (TiO ₂ +
CeO ₂ ) is less than 1, which is not preferable because hydrated titanium oxide and hydrated cerium oxide are not completely dissolved and remain. Furthermore, the larger the weight ratio of H ₂ O ₂ /(TiO ₂ +CeO ₂ ), the greater the solubility of hydrated titanium oxide and hydrated cerium oxide, and the reaction is completed in a short time. However, if too much hydrogen peroxide is used,
This is not preferred because a large amount of unreacted hydrogen peroxide remains in the system, which is not economical and affects the next step. Therefore, it is desirable that the weight ratio of H ₂ O ₂ /(TiO ₂ +CeO ₂ ) is in the range of 1 to 6, preferably 2 to 5. Using hydrogen peroxide in this range, hydrated titanium oxide and hydrated cerium oxide can be
Depending on its concentration and heating temperature, it will be completely dissolved in about 0.5 to 8 hours. If the concentration of hydrated titanium oxide and hydrated cerium oxide is too high, it will take a long time to dissolve, undissolved substances will precipitate, or the resulting aqueous solution will become too viscous. Therefore, it is desirable that the concentration of TiO ₂ +CeO ₂ in the aqueous solution after dissolution is about 10% by weight or less, preferably about 5% by weight or less. Next, this aqueous solution is heated as it is or after adjusting the (TiO ₂ +CeO ₂ ) concentration by adding water to the aqueous solution, at 60°C or higher, preferably at 80°C.
Hydrolyze by heating above. In this way, a titanium oxide/cerium oxide composite sol in which composite particles of titanium oxide and cerium oxide are dispersed is obtained. The titanium oxide/cerium oxide composite sol here refers to a mixed sol of titanium oxide particles and cerium oxide particles, a sol in which composite oxide particles in which titanium oxide and cerium oxide are chemically combined, or a sol in which titanium oxide and cerium oxide are dispersed. It means a sol in which single particles physically combined with cerium oxide are dispersed, or a hybrid sol of these. The sol obtained by the above method has approximately 4 to
It is a stable sol with excellent light resistance in which fine particles with an average particle size of 300 mμ are dispersed. A sol can also be produced by heating and hydrolyzing in the coexistence of an inorganic compound. That is, selected from groups of the periodic table such as Zn, groups such as Al, groups such as Ti, Zr, Si, Sn, groups such as V, Sb, groups such as W, and groups such as Fe. After mixing the inorganic compound of one or more elements obtained and the above aqueous solution, the resulting mixture is heated to 60° C. or higher to be hydrolyzed. The above-mentioned inorganic compounds are used in the form of salts, oxides, hydroxides, oxyacids, oxyacids, and the like. These inorganic compounds may be used in solid form or as an aqueous solution, but it is preferable to use them in the form of a gel or sol. When using an inorganic compound in the form of a sol,
It is desirable that the average particle size of the dispersed particles be about 30 mμ or less, preferably about 15 mμ or less. for example,
In the case of silicon, alkali silicates, silica gels, silica sol or silicic acid liquids are used.
Here, the silicic acid liquid means a low polymer solution of silicic acid obtained by dealkalizing an aqueous alkali silicate solution by an ion exchange method or the like. Increasing the amount of the inorganic compound mixed improves the long-term stability and light resistance of the resulting sol, and also provides a highly concentrated sol. However, after these effects reach a predetermined level, even if the amount of the inorganic compound mixed is increased any further, the effect of improving long-term stability, light resistance, etc. will not increase, which is not preferable. On the other hand, if the amount of the inorganic compound mixed is small, the effect of mixing the inorganic compound will not be achieved, which is not preferable. Considering the above, the amount of inorganic compounds to be mixed is determined by adding hydrogen peroxide to a dispersion of hydrated titanium oxide and hydrated cerium oxide to dissolve the hydrated titanium oxide and hydrated cerium oxide. _{The ratio (} TiO ₂ + CeO ₂ )/
It is preferable that MO _x (weight ratio) is in the range of 0.25 to 200. There are no particular restrictions on the method of mixing the aqueous solution of hydrogen peroxide and the inorganic compound, and a predetermined amount of the aqueous solution of hydrogen peroxide and the inorganic compound may be mixed all at once; It is also possible to first mix and heat a portion of each and then add the remainder of both as the reaction progresses. Furthermore, it is also possible to first mix and heat the entire amount of the inorganic compound and a portion of the hydrogen peroxide-dissolved aqueous solution, and then add the remaining aqueous solution. Additionally, the timing of mixing the inorganic compounds does not necessarily have to be after the hydrated titanium oxide and hydrated cerium oxide have been dissolved in hydrogen peroxide; they can also be mixed in the gel or sol stage before being dissolved in hydrogen peroxide. Furthermore, hydrated titanium oxide and hydrated cerium oxide may be mixed at the time of preparing a gel or sol.
In short, when the aqueous solution dissolved in hydrogen peroxide is heated and hydrolyzed, it is sufficient that the above-mentioned inorganic compound is present in the reaction system. The titanium oxide/cerium oxide composite sol obtained in this way has particles with an average particle size of 4 to 300 mμ dispersed in an aqueous dispersion medium, and has excellent dispersibility, long-term stability, and light resistance, and has a wide pH range. Area (3-12)
It is a stable sol. The titanium oxide/cerium oxide composite sol obtained by the production method according to the present invention can be used as is for various purposes, but it can be adjusted to an appropriate concentration by known methods such as vacuum evaporation and ultrafiltration. It can also be used after being concentrated. Further, depending on the application, it can be mixed with or substituted with an organic solvent such as alcohol or glycol to form an organic solvent-dispersed sol. Next, the cosmetic and the method for producing the same according to the present invention will be described. In the present invention, after adjusting the concentration of the titanium oxide/cerium oxide composite fine particles in the composite sol obtained as described above, this composite sol is mixed with other cosmetic base materials by a well-known method. By doing so, cosmetics can be obtained. As can be seen from the above-mentioned production method, the composite sol obtained by the present invention has a pH of 3 or more, usually 5 to 9, and therefore can be incorporated into cosmetics as is. In addition, the titanium oxide/cerium oxide composite sol of the present invention using water as a dispersion medium may be mixed with an organic solvent such as alcohol, glycol, or glycerin, or
Alternatively, even if the solvent is replaced, the composite sol is very stable even without the addition of a surfactant. Therefore, depending on the type of cosmetic, the composite sol according to the present invention can be incorporated into the cosmetic as an organic sol using the above-mentioned organic solvent as a dispersion medium. In the cosmetic according to the present invention, the titanium oxide/cerium oxide composite sol has a content of (CeO ₂ +
TiO ₂ ) is incorporated in an amount of at least 0.001% by weight, preferably 0.005 to 90% by weight. If the amount of the composite sol is less than 0.001% by weight, the resulting cosmetic will not have a sufficient ultraviolet shielding effect, which is not preferable. The cosmetics according to the present invention can be in the form of powder, cake, pencil, stick, ointment, liquid, etc., and specifically include lotions, foundations, creams, milky lotions, eye shadows, and makeup. Base, nail enamel, eyeliner, mascara,
This includes lipstick, packs, shampoo, conditioner, hair cosmetics, etc. Effects of the invention The titanium oxide/cerium oxide composite sol according to the present invention is extremely stable in a wide range of pH 3 to 12, and has a pH of 4.
It is a sol in which fine particles with a particle size of ~300mμ are uniformly dispersed, and has excellent dispersibility, long-term stability, and light resistance. Also, because it contains cerium oxide,
Compared to titanium oxide sol of the same concentration, it is more resistant to ultraviolet rays in the 320 to 400 nm, especially 340 to 380 nm range.
It has excellent shielding effect. The cosmetics of the present invention have excellent ultraviolet shielding effects and are particularly susceptible to melanin pigmentation on the skin.
It very well blocks ultraviolet rays in the vicinity of 340-380 nm (UV-A region), providing excellent protection for the skin from ultraviolet rays, and has excellent dispersibility even when added to cosmetic base materials in large quantities. The material has excellent light resistance, feel in use, and finish. In addition, the average particle size is approximately
Cosmetics containing titanium oxide/cerium oxide composite fine particles of 80 mμ or less do not lose their transparency even when added in relatively large amounts, so they are suitable as cosmetic formulations that require transparency. There is. EXAMPLES The present invention will be explained below with reference to Examples, but the present invention is not limited to these Examples. Production example 1 5g of cerium chloride as CeO ₂ and 5g of TiO ₂
and titanium tetrachloride were dissolved in pure water to prepare 1000 g of a mixed aqueous solution. Add 15% ammonia water to this,
The mixture was gradually added until the pH reached 9.0 to obtain a coprecipitated gel of hydrated titanium oxide and hydrated cerium oxide. After dehydrating and washing the coprecipitated gel thus obtained, 110 g of this coprecipitated gel was added with 35% hydrogen peroxide.
115g and 25g of pure water were added and then heated to 80°C to obtain 250g of a pale yellow-orange-brown transparent aqueous hydrogen peroxide solution. The pH of this aqueous hydrogen peroxide solution was 8.7. This aqueous solution is mixed with oxide (TiO ₂
+CeO ₂ ) was diluted with pure water to a concentration of 0.1% by weight, and then heated at 95° C. for 96 hours. After 96 hours,
A transparent titanium oxide/cerium oxide composite sol with a pale yellow milky white color was obtained. The pH of this sol is 6.8,
Fine particles with a minimum size of 6mμ and a maximum of 20mμ are dispersed,
The specific surface area (BET method) of these fine particles was 256 m ² /g. In addition, this sol was processed by vacuum evaporation method (CeO ₂
+TiO ₂ ) remained stable even when concentrated to a concentration of 20% by weight. In addition, a part of the sol obtained above was diluted as oxide (TiO ₂ + CeO ₂ ) to a concentration of 0.05% by weight, and this was placed in a 1 mm thick quartz cell and measured using a spectrophotometer (Hitachi Model 330). ) The light transmittance from 260 to 500 nm was measured. The results are shown in FIG. 1 (curve A). Production Example 2 250 g of hydrogen peroxide dissolved aqueous solution obtained in the same manner as Production Example 1 was mixed with 15 g of silica sol with an average particle size of 7 mμ and a SiO ₂ concentration of 10% by weight and 9.7 kg of pure water, and then heated at 150°C for 10 heated for an hour. After 10 hours, a pale yellow milky white transparent titanium oxide/cerium oxide composite sol was obtained. The pH of this sol is 7.3, the dispersed particle diameter is 7 to 21 mμ, and the specific surface area of the particles is
It was 266m ² /g. This sol remained stable even when concentrated to 27% by weight in the same manner as in Production Example 1.
Moreover, the light transmittance measured by the same method as Production Example 1 was almost the same as Production Example 1. Production Example 3 10 g of ceric ammonium nitrate was dissolved as CeO ₂ in pure water to obtain a 0.5% by weight aqueous solution as CeO ₂ . Add 15% ammonia water to this, pH is 9.0
The solution was gradually added until the solution was dissolved, and after dehydration and washing, 100 g of hydrated cerium oxide gel was obtained. 112 g of 5% by weight hydrochloric acid was added to this to dissolve the hydrated cerium oxide. Next, a titanium tetrachloride aqueous solution was added to this aqueous solution so that CeO ₂ /TiO ₂ = 1 (weight/weight), and then 15% ammonia water was gradually added to adjust the pH.
Adjusted to 8.0. When the mixed gel of hydrated titanium oxide and hydrated cerium oxide thus obtained was dissolved in hydrogen peroxide in the same manner as in Production Example 1, the pH was
9.2, 500 g of a pale yellow-orange-brown transparent aqueous hydrogen peroxide solution was obtained. Next, 780 g of a silicic acid solution (SiO ₂ 5% by weight) obtained by dealkalizing a water glass aqueous solution with a cationic resin and pure water were added to 500 g of this hydrogen peroxide dissolved aqueous solution.
After mixing with 720g, it was heated to 172°C. After heating for 16 hours, a titanium oxide/cerium oxide composite sol with a pale yellow, milky white color and a pH of 7.5 was obtained.
The diameter of the dispersed particles in this sol was in the range of 7 to 19 mμ, and the specific surface area of the particles was 243 m ² /g. In addition, after uniformly mixing 20 g of the sol concentrated to 25% by weight (CeO ₂ /TiO ₂ ) and 5 g of Carbopol dissolved in 75 g of pure water, the mixture was spread onto a quartz plate using a doctor blade. The film was made into a 5 μm thick film, and the light transmittance was measured using a spectrophotometer (Model 330, manufactured by Hitachi, Ltd.). The results are shown in Figure 2 (curve A). Production Example 4 In Production Example 3, CeO ₂ /TiO ₂ = 1 (weight/
The same procedure as Production Example 3 was carried out except that the weight) was changed to 4, and the pH was 6.8 and the dispersed particle size was 6 to 40 mμ.
A composite sol with a particle specific surface area of 350 m ² /g was obtained. Moreover, this sol remained stable even when concentrated to 30% by weight. The light transmittance of the sol measured in the same manner as in Production Example 3 is shown in FIG. 2 (curve B). Production Example 5 10 g of ceric ammonium nitrate was dissolved as CeO ₂ in pure water to obtain a 2.0% by weight aqueous solution as CeO ₂ . Add 15% ammonia water to this, pH is 9.0
After gradually adding the solution to 100%, the solution was dehydrated and then washed, yielding 118 g of hydrated cerium oxide gel. To this was added 130 g of 5% by weight hydrochloric acid to dissolve the hydrated cerium oxide. Next, CeO ₂ /TiO ₂ = 1/9 (weight/weight) was added to this aqueous solution.
After adding titanium tetrachloride aqueous solution so that
The pH was adjusted to 8.4 by gradually adding 5% aqueous ammonia. When the mixed gel of hydrated titanium oxide and hydrated cerium oxide thus obtained was dissolved in hydrogen peroxide in the same manner as in Production Example 1, the pH was 9.2.
250 g of a pale yellow-orange-brown transparent aqueous solution was obtained. Next, in the same manner as in Production Example 2, a titanium oxide/cerium oxide composite sol having a pH of 7.8 was obtained. The particle size of the dispersed particles was 4 to 25 mμ, and the specific surface area of the particles was 180 m ² /g. Production Example 6 A titanium oxide/cerium oxide composite sol having a pH of 6.5 was obtained in the same manner as Production Example 5 except that CeO ₂ /TiO ₂ was changed to 9.5/0.5 (weight/weight). (Dispersed particle size = 4 to 65 mμ, particle specific surface area 170 m ² /g). Example 1 The titanium oxide/cerium oxide composite sol obtained in Production Example 4 was blended with the following ingredients in the following manner to produce a lotion. Cerium oxide titanium oxide composite sol (CeO ₂ /
TiO ₂ = 30% by weight) 20% by weight Propylene glycol 4.0 〃 Oleyl alcohol 0.1 〃 Polyoxyethylene lauryl ether 0.5 〃 Ethanol 11.5% by weight Fragrance 0.1 〃 Pure water 63.8 〃 Dye Appropriate amount Add the oxidation obtained as above to pure water Cerium titanium oxide composite sol and propylene glycol were mixed. Separately, a mixture of ethanol, oleyl alcohol, polyoxyethylene lauryl ether, and fragrance was prepared, and the pure water mixture was added thereto. After adding dye to adjust the color, it was filtered and made into a product. A portion of this lotion was taken and placed in a 1 mm thick quartz cell, and the light transmittance from the visible region to the ultraviolet region was measured using a spectrophotometer. The results are shown in Figure 3 (curve A). In addition, in order to evaluate light resistance, this lotion was sealed in a quartz cell, and the degree of discoloration of the lotion after being left exposed to sunlight for 40 days was observed. Similarly, the degree of discoloration was examined after irradiation with carbon arc light for 300 hours and after irradiation with xenon lamp for 300 hours. The results are shown in Table 1. Example 2 A milky lotion foundation was prepared by blending the titanium oxide/cerium oxide composite sol obtained in Production Example 6 with the following ingredients in the following manner. Cerium oxide titanium oxide composite sol (CeO ₂ + TiO ₂ = 20% by weight) 40% by weight Pure water 28.1 〃 Triethanolamine 1.1 〃 Methyl paraoxybenzoate Appropriate amount Carboxymethyl cellulose 0.2% by weight Bentonite 0.5 〃 Stearic acid 2.4 〃 Propylene monostearate glycol
2.0 〃 Cetostearyl alcohol 0.2 〃 Liquid paraffin 3.0 〃 Liquid lanolin 2.0 〃 Isopropyl myristate 8.5 〃 Titanium oxide pigment 1.0 〃 Talc 11.0% by weight Fragrance Appropriate amount After dispersing the cerium oxide/titanium oxide composite sol in pure water, add it to this. Carboxymethylcellulose was dispersed. Add bentonite to this,
The bentonite was heated to 70° C. with thorough stirring to cause the bentonite to swell well. Next, triethanolamine and methyl p-oxybenzoate were added to this liquid. A pulverized mixture of pigment and talc was added to this, well dispersed with a colloid mill, and heated to 75°C. Separately, a mixture of stearic acid, propylene glycol monostearate, cetostearyl alcohol, liquid paraffin, and isopropyl myristate is prepared, heated to 80°C, mixed with the above dispersion mixture, and thoroughly stirred. Thereafter, the mixture was cooled, a fragrance was added at 45°C, and the mixture was stirred and cooled to room temperature. The foundation thus obtained is UV-A
The foundation was excellent in UV shielding effect, including the area, and was also comfortable to use. Comparative Example 1 Dissolve titanium sulfate in pure water to obtain 0.4 _% TiO2.
An aqueous solution containing % by weight was obtained. While stirring this aqueous solution, 15% ammonium water was gradually added, and the pH
A white slurry liquid of 8.5 was obtained. This slurry was filtered and washed to obtain a cake of hydrated titanium oxide gel having a solid content concentration of 9% by weight. After adding 610 g of 33% hydrogen peroxide solution and 1300 g of pure water to 550 g of this cake, it was heated at 80°C for 5 hours.
2.5Kg of 2.0% by weight solution as _TiO2 was obtained. This aqueous solution was yellowish-brown and transparent, and had a pH of 8.1. Next, add 13g of silica sol with a particle size of 7mμ and a concentration of 15% by weight, 900g of the above aqueous solution, and pure water.
After mixing with 1000g, it was heated at 95°C for 624 hours.
The solution was initially a yellow-brown liquid, but after 624 hours, a milky-white and transparent titanium oxide sol was obtained. The average particle size of the dispersed particles in this sol was 24 mμ. A portion of the obtained titanium oxide sol was diluted with pure water to give a TiO ₂ concentration of 0.05% by weight, and the light transmittance was measured in the same manner as in Example 1. The results are shown in Figure 1 (curve B). As is clear from the comparison of curves A and B, the titanium oxide/cerium oxide composite sol of the present invention is particularly superior to titanium oxide sol that does not contain cerium oxide.
It can be seen that it has an excellent shielding effect against ultraviolet rays in the UV-A region. Comparative Example 2 A lotion was prepared in the same manner as in Example 1, except that the titanium oxide sol (TiO ₂ : 30% by weight) of Comparative Example 1 was used instead of the titanium oxide/cerium oxide composite sol of Example 1. was manufactured. The light transmittance of this lotion is shown in FIG. 3 (curve B). Furthermore, the light resistance was evaluated in the same manner as in Example 1, and the results are shown in Table 1. As can be seen from Figure 3 and Table 1, the lotion of the present invention has a higher UV-A resistance than the lotion containing titanium oxide sol.
Excellent UV shielding effect and light resistance including areas.

[Table] ◎: No discoloration △: Slight discoloration

[Brief explanation of drawings]

In FIG. 1, curve A is a curve showing the light transmittance of the titanium oxide/cerium oxide composite sol according to the present invention, and curve B is a curve showing the light transmittance of the titanium oxide sol. In FIG. 2, curve A is a curve showing the light transmittance of the titanium oxide/cerium oxide composite sol of CeO ₂ /TiO ₂ =1 (weight/weight) according to the present invention, and curve B is a curve showing the light transmittance of the CeO ₂ /TiO 2 =1 (weight/weight) titanium oxide/cerium oxide composite sol. / _TiO2 =
4 is a curve showing the light transmittance of the titanium oxide/cerium oxide composite sol of No. 4. In Figure 3, curve A
is a curve showing the light transmittance of the lotion containing the titanium oxide/cerium oxide composite sol according to the present invention, and curve B is a curve showing the light transmittance of the lotion containing the titanium oxide sol.

Claims (1)

[Claims] 1. Obtained by adding hydrogen peroxide to a dispersion of hydrated titanium oxide and hydrated cerium oxide to dissolve the hydrated titanium oxide and hydrated cerium oxide, and then heating this solution. A cosmetic characterized by containing a titanium oxide/cerium oxide composite sol. 2 Hydrogen peroxide is added to a dispersion of hydrated titanium oxide and hydrated cerium oxide to dissolve the hydrated titanium oxide and hydrated cerium oxide, and then this solution is added to a dispersion of hydrated titanium oxide and hydrated cerium oxide. It is characterized by containing a titanium oxide/cerium oxide composite sol obtained by heating in the coexistence of an inorganic compound of one or more elements selected from Group 3, Group 3, and Group 3. cosmetics. 3. A method for producing a cosmetic, which comprises blending the titanium oxide/cerium oxide composite sol produced by the method according to claim 1 or 2 into a cosmetic base material.