JPS61215216A - Hydrophobic spherical particle of titanium oxide - Google Patents

Abstract

PURPOSE:To improve the spreadability and applicability of a makeup cosmetic, by coating the surface of spherical titanium oxide particles with a hydrophobic substance and compounding the treated particles to a cosmetic base. CONSTITUTION:Spherical titanium oxide particles having a particle diameter of 0.1-50mum are coated with a hydrophobic substance selected from higher fatty acid, higher aliphatic alcohol, their derivative, organic fluorine compound and organic silicon compound. The coated spherical titanium oxide is added to a makeup cosmetic base in an amount of about 0.5-50wt%. The feeling of the cosmetic to the skin can be improved by the addition of the surface- treated spherical titanium oxide.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to spherical titanium oxide particles whose surfaces are coated with a hydrophobic substance and cosmetics containing the particles.

Traditionally, titanium dioxide has been incorporated into cosmetics as an inorganic pigment with strong covering power. However, regular titanium dioxide does not have a fixed particle shape and has too strong adhesion to the skin, so when it is actually used in cosmetics, the frictional resistance between particles and with the skin is large, making it difficult to spread smoothly. The drawback was that it did not give a certain feel.

Therefore, in Japanese Patent Application No. 59-238,763, spherical titanium oxide was incorporated into makeup cosmetics, and in Japanese Patent Application No. 59-180,146, silica beads coated with titanium dioxide were incorporated into makeup cosmetics to overcome the above-mentioned drawbacks. However, it is said that even if spherical titanium oxide or titanium oxide-coated silica beads are added, the makeup cosmetics do not spread sufficiently on the skin.

The present inventors coated the surface of spherical titanium oxide particles with a hydrophobic substance and blended this into makeup cosmetics to create makeup cosmetics with further improved spreadability and texture. made it possible to obtain.

According to the present invention, when the surface of spherical titanium oxide particles is coated with a hydrophobic substance, it is very compatible with lipophilic substances added to makeup cosmetics, such as liquid paraffin, lanolin, stearic acid, fatty alcohols, etc. When mixed, it exhibits good dispersibility, which improves the spreadability, adhesion, and texture of makeup cosmetics containing the spherical titanium oxide.

In the present invention, particles with a diameter of 0.1 are obtained by coating the surface with a hydrophobic substance.
Provided are spherical titanium oxide particles of μm to 50 μm.

The raw material spherical titanium oxide particles are, for example,
No. 9-144967, i.e., by spraying a highly concentrated titania sol onto a water-repellent surface to deposit droplets, drying and firing the droplets; According to the method described in the applicant's Japanese Patent Application No. 137838/1983, particles of titanium dioxide for pigments are suspended in a dilute aqueous solution of titanyl sulfate, the titanyl sulfate is hydrolyzed, and the surface of the primary particles of titanium dioxide is A product prepared by multiple coating can be used. These must have a breaking strength that can withstand the impact when mixed with a hydrophobic substance. The particle size of these spherical titanium oxides is 0.1 μm to 50 μm.
m, preferably 1 μm to 20 μm. If the particle size is too small, no sliding effect can be expected, and if the particle size is too large, the hiding power will be poor, and it will give a rough and unnatural feeling, significantly lowering the commercial value.

The hydrophobic substances used in the present invention are known ones, such as waxes, higher fatty acids such as higher fatty acid triglycerides, higher fatty acids, polyvalent metal salts of higher fatty acids, and polyvalent metal salts of higher aliphatic sulfates, and higher fatty acids. Alcohols or their derivatives. Organic fluorine compounds such as perfluorinated higher fatty acids and higher fatty alcohols, partially fluorinated higher fatty acids and higher fatty alcohols, and organosilicon compounds such as polysiloxanes and silanes can also be used.

The coating amount of the hydrophobic substance may be at least an amount that allows the hydrophobic substance to completely cover the surface of the spherical titanium oxide particles. This amount can be calculated using the formula minimum coverage area of the hydrophobic substance (rrr/g), and is determined by the particle size (specific surface area) of the spherical titanium oxide particles and the type of the hydrophobic substance. However, if the amount added is too large, free particles of hydrophobic substances will be generated.
It reduces the sliding effect and is also uneconomical. On the other hand, if the amount added is too small, an uncoated spherical titanium oxide surface will be formed, and the sliding effect will not be maximized.

The coating method varies somewhat depending on the hydrophobic substance used, but for example, ordinary dry methods and wet methods can be used. The dry method means that spherical titanium oxide is mixed well with a V-type mixer or Henschel mixer, etc.
Add a hydrophobic substance diluted with a solvent by spraying, etc., mix well, and let it adhere uniformly to the surface of the spherical titanium oxide.
15 if necessary to dry and make the adhesion stronger.
This is a method of heating at about 0°C. In the wet method, spherical titanium oxide is dispersed in water or an organic solvent to form a slurry, a hydrophobic substance and, if necessary, a reaction additive, etc. are added to the slurry, and the slurry is further stirred thoroughly. The treatment can also be carried out by heating and hydrolysis. A coating is obtained by applying this and drying it.

The surface-coated spherical titanium oxide particles of the present invention have a particle size of 0.1 to 50
It can be incorporated into makeup cosmetics in a range of % by weight. As the amount of cosmetics increases, the elongation effect of the cosmetic increases.
If it is more than 50% by weight, the elongation effect will not change much even if the amount is increased (and therefore it will be uneconomical), and if it is less than 0.1% by weight, the effect will be almost the same as if it was not mixed.

The makeup cosmetic containing spherical titanium oxide particles whose surface is coated with a hydrophobic substance according to the present invention can be used not only in conventional makeup cosmetics, but also in makeup containing untreated spherical titanium oxide particles or titanium oxide-coated silica beads. It spreads better than make-up cosmetics and gives a very smooth feel to the skin.

Furthermore, the hydrophobic substance-coated spherical titanium oxide particles of the present invention can be used as an additive for cleansing foams in addition to makeup cosmetics.

The cleansing foam containing spherical titanium oxide is
Spherical titanium oxide acts as an abrasive with low frictional resistance against the skin, removes oil and fat from the skin appropriately, and can be used for pine surge without damaging the skin, so it has the effect of activating metabolism without damaging the skin.

Furthermore, for the same reason, the spherical titanium oxide particles of the present invention can also be used in dental applications as an abrasive that does not damage tooth enamel.

The present invention will be explained in more detail below with reference to production examples of spherical titanium oxide, examples of production of hydrophobic substance-coated titanium oxide, and formulation examples of makeup cosmetics to which the coated spherical titanium oxide is added.

Preparation Example I of Titanium A titanyl sulfate solution containing 250 g/l of TiQz and 500 g/j2 of free sulfuric acid was heated to 105°C.

Separately, water was heated to 95° C. and stirred in a three-necked flask, and the above titanyl sulfate solution was added thereto at a rate of 50 parts/win. After the addition was completed, the temperature was kept at 95° C. for about 2 hours to hydrolyze titanium oxide. After passing this through the suction port, the pass-through cake was dispersed in 1000 ae of warm water, and the four rules were applied again.
570 g of mouth cake was obtained. Add this cake to 700 ml of water
Dispersed in d. The pH at this time was 1.6.

Concentrated aqueous ammonia was added dropwise to the slurry obtained by the above method while stirring to neutralize the slurry to pH 7.0.

Pass this material through the suction port again, wash it with 1000 d of warm water,
The cake was thoroughly compressed and hydrophilized. This cake was peptized by adding concentrated hydrochloric acid to obtain a translucent and fluid titania sol having a pH of 1.6 and a TiOz content of 40% by weight.

The titania sol obtained by the above method is made of Teflon (fluororesin).
■Pneumatic pressure of 5 kg/aJ was applied to the sheet using an "Akigent" two-fluid nozzle manufactured by Ikeuchi Co., Ltd.

Coating was carried out at a liquid pressure of 2 kg/-. The sprayed Teflon plate was placed in a dryer, and after drying at 100° C. for 1 hour, titanium oxide spheres were collected with a brush. Raise the temperature to 200℃/h
By firing at 900° C. for 2 hours, spherical titanium oxide having a particle size of 1 to 10 μm and having enough strength to withstand the impact of a Henschel mixer etc. was obtained.

Production Example 2 2 g of commercially available rutile-type titanium oxide (manufactured by Teikoku Kako, rJRJ) was added to 120 g of water and stirred well. The suspension was heated, and when it reached 80°C, a titanyl sulfate aqueous solution (
Total sulfuric acid/total Ti0z -1,7, 20% in terms of Ti0z)
Add 30g rapidly and continue to heat. After reaching the boiling point, maintain this state for 4 hours. Rinse the product with water,
Separate the cake and dry at 120°C and then at 800°C.
It was baked for 2 hours. This material was spherical titanium oxide with an average particle size of 10 μm.

Example 1 of Example 1 2 g of methylhydrodiene polysiloxane (manufactured by Shin-Etsu Silicone Co., Ltd., silicone oil KF-99) was diluted 20 times with 70%. This was added by spray to 100 g of spherical titanium oxide prepared in Production Example 2, which was being mixed in a V-type mixer. Mixing continued for approximately 2 hours after the addition was complete. This was heated at 150'e for 2 hours. In this way, water-repellent spherical titanium oxide treated with polysiloxane was obtained.

Example 2 100 g of spherical titanium oxide prepared in Production Examples 1 and 2 was dispersed in water IIt and heated to 80'C.

Separately, 2 g of sodium lauryl sulfate was dissolved in 50 parts of hot water at 80° C., and this was mixed with the spherical titanium oxide dispersion.

In addition, 5M polyaluminum chloride (Als(OR)1
2ces) 1.4 components were gradually added during the above stirring. 2
After stirring for 0 minutes, the mixture was allowed to cool, rinsed with water, and dried at 110°C. In this way, lipophilic spherical titanium oxide treated with aluminum polymerizable aluminum lauryl sulfate was obtained.

Formulation example 1 Powder foundation 20 Talc 20 Mica 50 Zinc stearate 5 Coloring pigment 5 Spherical titanium oxide of Example 2 Liquid paraffin 5 Lanolin 3 Sorbitan monooleate 2 Fragrance Ingredients melted by heating B was added to component A which was being stirred and mixed using a Henschel mixer, and further stirred and mixed.

This was pulverized with a pulverizer and press-molded into Gold I.

Formulation example 2 Non-emulsifying cream base and olive oil 5 Vaseline 5 Liquid paraffin 20 Synthetic ester 3 Surfactant 2 Beeswax 5 Kaito A Danri coloring pigment Appropriate amount Regular titanium oxide 20 Spherical titanium oxide from Example 1 40 80 While thoroughly stirring component A, which had been heated and dissolved at .degree. C., component B was added little by little to disperse it well. This was filled into a container.

Formulation example 3 Emulsified foundation bottom layer and liquid paraffin 20 cetyl alcohol 2 stearic acid
l paraffin wax
Glyceryl monostearate
2 Polyoxyethylene hydrogenated castor oil (40E
O) 3 Commandments J-Rolow Purified Water 30 Propylene Glycol 10 Coloring Pigments
5 Spherical titanium oxide of Example 2 15 Component A was heated and dissolved at 80° C. Next, component B was heated and dissolved at 85° C., and added little by little to component A to emulsify. This was filled into a container.

Formulation example 4 White powder "Kai" Niri Talc 65 Mica 20 Coloring pigment Quantity Spherical titanium oxide IO of Example 1 Uribei 2 Liquid paraffin 5 Admission fee Appropriate amount Component A was stirred and mixed using a Henschel mixer.

Component B was then added to component A and mixed. This was crushed using a crusher.

Formulation example 5 Oil-based foundation Uryujin and carnauba wax 2 Ceresin 2 Microcrystalline wax 2 Liquid paraffin 25 Silicone oil 15 Lanolin 5 Kaiyutan L Mica 10 Talc 5 Coloring pigment 5 Ordinary titanium oxide lO Spheroidal titanium oxide of Example 1 20 While heating and stirring component A at 90°C, component B, which had been blended in advance, was added little by little and well dispersed.

Thereafter, it was allowed to cool to 70°C, and an appropriate amount of fragrance was added and filled into whole blood, and allowed to cool to room temperature.

Next, a makeup cosmetic sample (A) containing spherical titanium oxide whose surface was treated with the hydrophobic substance of Formulation Examples 1 to 5,
Comparative sensory test with a makeup cosmetic sample (B) containing unsurface-treated spherical titanium oxide instead of the surface-treated spherical titanium oxide and a cosmetic sample (C) containing commercially available titanium oxide. The results are shown in the table below.

From the results in the table, it can be seen that the makeup cosmetics containing surface-treated spherical titanium oxide have improved spreadability and wearability compared to conventional makeup cosmetics, and are extremely comfortable to use.

(Margin below) Procedural amendment April 2, 1985

Claims (5)

[Claims] (1) Particle size 0.1 μm whose surface is coated with a hydrophobic substance
~50 μm spherical titanium oxide particles. (2) The spherical titanium oxide particles according to item 1, wherein the hydrophobic substance is a higher fatty acid, a higher fatty alcohol, or a derivative thereof. (3) Spherical titanium oxide particles according to item 1, wherein the hydrophobic substance is an organic fluorine compound. (4) Spherical titanium oxide particles according to item 1, wherein the hydrophobic substance is an organosilicon compound. (5) Particle size 0.1 μm whose surface is coated with a hydrophobic substance
A cosmetic containing 0.5 to 50% by weight of spherical titanium oxide with a diameter of ~50 μm.