JP3071555B2 - Skin cosmetics - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to skin cosmetics such as solid cosmetics, emulsified cosmetics and sunscreen cosmetics.

[0002]

2. Description of the Related Art Conventionally, titanium oxide (having an average particle size of 0.1 μm
Since the following is effective for ultraviolet protection, it is known to be added to cosmetics to impart a sunscreen effect. However, fine-particle titanium oxide generally has problems such as discoloration and unpleasant odor when incorporated into cosmetics, and because of its fine particles, it has strong cohesiveness and is difficult to disperse uniformly. However, there is a drawback that the compound cannot be sufficiently compounded because of poor spread and a strong sense of roughness.

Therefore, it has been proposed to use titanium oxide particles whose surfaces are coated with hydrates of silicic acid and alumina and then surface-treated with silicon oil (Japanese Patent Laid-Open No. 3-115211). Gazette). However, in this case, after the coating treatment of the titanium oxide particles with the alumina hydrate, not only the surface coating treatment with silicon oil is required, but also it takes time to disperse the compounding with the cosmetic base material, and the skin spreads. In addition, there is a problem that the adhesion to the skin or the like is not sufficient and the color dullness or the like may occur, and the amount of the compound is also limited.

[0004]

SUMMARY OF THE INVENTION In view of such circumstances, the present inventors have studied the fine particle powder having excellent ultraviolet protection and suitable for blending skin cosmetics. As a result, the present inventors have reached the present invention. . The object of the present invention is that when applied to the skin, the fine particles are uniformly distributed on the skin surface, excellent in transparency, the skin color appears as it is, the spread and adhesion to the skin is good, and the production time is very short. Another object of the present invention is to provide a skin cosmetic composition having a high UV protection effect and capable of obtaining a stable dispersibility.

[0005]

Means for Solving the Problems To achieve the above object, the skin cosmetic of the present invention is obtained by a flame hydrolysis method,
And titanium oxide, silicon dioxide, zirconium oxide,
A composite oxide fine particle having an average particle diameter of 5 to 50 nm, which is composed of one or two kinds of alumina, is blended.

The composite oxide fine particles used in the present invention are obtained by a so-called flame hydrolysis method. That is, any vapor of a halide such as titanium, silicon, or aluminum is mixed with a gas that forms and combusts water, for example, hydrogen and oxygen (or air), burns with a burner, and reacts in the flame. (For example, JP-B-36-3359 and JP-B-47-46274) for producing fine particles of any of titanium, silicon and aluminum oxides by hydrolysis.
The composite oxide used in the present invention can be easily obtained by applying such a flame hydrolysis method. For example, oxidation is performed by using titanium tetrachloride vapor and silicon tetrachloride vapor as the main component, using the latter at a required ratio, and charging the mixture into a mixed gas of hydrogen and air (or oxygen) with a burner. Composite oxide fine particles comprising titanium and silicon dioxide are obtained. Similarly, by combining titanium tetrachloride vapor with zirconium tetrachloride vapor or aluminum chloride vapor, fine particles of a composite oxide of titanium oxide and zirconium oxide or alumina can be obtained.

The above-mentioned composite oxide is not a simple mixture of titanium oxide particles and fine particles of silicon dioxide, zirconium oxide or alumina, and is different from one in which the surface of titanium oxide fine particles is coated with silicon dioxide or another oxide. Are mainly composed of titanium oxide, and silicon dioxide, zirconium oxide or alumina is bonded to the composite at a predetermined ratio to form a composite oxide. The average particle size of the fine particles is fine in the range of 5 to 50 nm, and the size and ratio of the generated oxide particles can be adjusted by the charged amount of the gas mixture to be burned. The particles are mainly composed of titanium oxide, and silicon dioxide and zirconium oxide having a range of 0.1 to 40% by weight are used in a liquid or powder when both are protected from ultraviolet rays and are blended in cosmetics. Because it has excellent dispersibility, spreads and spreads well on the skin and does not cause dullness,
Excellent effects can be obtained for various skin cosmetics.

[0008]

Example 1 A sunscreen was obtained by the following formulation and production method. 1. 1. Lipophilic glyceryl monostearate 3.0 wt% 2. Cetanol 4.0 wt% 3. Vaseline 3.0 wt% 4. Liquid paraffin 7.5 wt% 5. Isopropyl myristate 7.5 wt% 6. 6. Polyoxyethylene sorbitan monolaurate (20E.O.) 2.0 wt% 7. Composite oxide fine particles (titanium oxide: silicon dioxide) 5.0 wt% 8.1,3-butylene glycol 3.0 wt% 9. Glycerin 2.0 wt% 10. Preservative appropriate amount 11. Purified water 63.0 wt% 12. Perfume Appropriate amount Total 100.0 wt% [Production method] Heating and dissolving the above 1 to 6 and keeping at 75 ° C, into which, dissolving and dispersing the above 7 to 11 and keeping at 75 ° C and adding and stirring. Mix. Thereafter, the mixture was cooled while stirring, and at the temperature of 50 ° C., the above 12 was added.
The product was obtained by cooling to ° C.

[0009]

Comparative Example 1 A sunscreen was obtained in the same manner as in Example 1, except that the same amount of ordinary fine titanium oxide powder was used instead of the composite oxide fine particles. These sunscreen creams were subjected to a one-month sun exposure test. Table 1 shows the results.

[0010]

[Table 1] As shown in Table 1, the cosmetic of the present invention was more stable to sunlight exposure than the conventional product. Further, when dispersed in water, the composite oxide fine particles of the present invention were well dispersed in a very short time.

[0011]

Example 2 A sunscreen was obtained by the following formulation and production method. 1. 1. Lipophilic glyceryl monostearate 3.0 wt% 2. Cetanol 4.0 wt% 3. Vaseline 3.0 wt% 4. Liquid paraffin 7.5 wt% 5. Isopropyl myristate 7.5 wt% 6. Octyl methoxycinnamate 5.0 wt% 7. 7. Polyoxyethylene sorbitan monolaurate (20E.O.) 2.0 wt% 9. Composite oxide fine particles (titanium oxide: silicon dioxide: alumina) 5.0 wt% 9.1,3-butylene glycol 3.0 wt% 10. Glycerin 2.0 wt% 11. Preservative appropriate amount 12. Purified water 58.0 wt% 13. Perfume Appropriate amount Total 100.0 wt% [Production method] Heating and dissolving the above 1 to 7 and keeping at 75 ° C, into which the heated and dispersing dispersion of 8 to 12 kept at 75 ° C is added and stirred. Mix. Thereafter, the mixture was cooled with stirring, and at the temperature of 50 ° C., the above 13 was added.
The product was obtained by cooling to ° C.

[0012]

Comparative Example 2 A sunscreen cream was obtained in the same manner as in Example 2, except that the same amount of ordinary titanium oxide fine powder was used instead of the composite oxide fine particles.

[0013]

Example 3 A powder foundation was obtained by the following formulation and production method. 1. 1. Composite oxide fine particles (titanium oxide: alumina) 5.00 wt% 2. Talc 25.00 wt% Mica 48.25 wt% 4. Nylon powder 5.00 wt% 5. 5. Yellow iron oxide 0.50 wt% Bengara 0.20 wt% 7. Black iron oxide 0.05 wt% 8. 8. Dimethyl polysiloxane 2.00 wt% 9. 2-ethylhexyl palmitate 8.00 wt% Isostearic acid 2.00 wt% 11. Liquid paraffin 3.00 wt% 12. Vaseline 1.00 wt% 13. Preservative appropriate amount 14. Perfume Appropriate amount Total 100.00 wt% [Production method] The above 1 to 7 were put into a Hensel mixer and mixed, and then the above heated and melted 8 to 13 and 14 were added and mixed. Then, it was pulverized, put into a metal dish, and pressure-molded.

[0014]

Comparative Example 3 A powder foundation was obtained in the same manner as in Example 3, except that the same amount of ordinary fine titanium oxide powder was used instead of the composite oxide fine particles.

[0015] Fifteen women were used for Examples 2 and 3 and Comparative Examples 2 and 3, and were evaluated for stretchability on the skin, adhesion to the skin, and color development on the skin according to the following criteria. The results were as shown in Table 2.

[0016]

[Table 2] [Evaluation Criteria] Bad 2. A little bad 3. Normal 4. Good 5. very good

[0017]

As described above, the skin cosmetic of the present invention has not only a sunscreen effect, but also a complex oxide particle having an ultraviolet protection ability dispersed in various types of skin cosmetic base materials. Very effective as a skin cosmetic, such as good dispersibility, rapid dispersion, good spread and spread on the skin upon use, no roughness when used, and no dullness of the skin due to application. large.

Claims (1)

(57) [Claims] An average particle size obtained by a flame hydrolysis method and comprising titanium oxide and one or two of silicon dioxide, zirconium oxide and alumina is 5 to 50 nm.
A skin cosmetic comprising the compound oxide fine particles of the above.