FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
[See section 10, Rule 13]
TITANIUM DIOXIDE COMPOSITE POWDERS AND MAKEUP COMPOSITION CONTANING THE SAME;
AMOREPACIFIC CORPORATION, A
CORPORATION ORGANIZED AND EXISTING UNDER THE LAWS OF REPUBLIC OF KOREA, WHOSE ADDRESS IS 181, HANGANG-RO 2-GA, YONGSAN-GU, SEOUL 140-777, REPUBLIC OF KOREA
THE FOLLOWING SPECIFICATION
PARTICULARLY DESCRIBES THE INVENTION AND THE MANNER IN WHICH IT IS TO BE PERFORMED.

DESCRIPTION
Technical Field
The present invention relates to a titanium dioxide composite powder and a makeup composition containing the same, and more particularly to a titanium dioxide composite powder and a base makeup composition containing the same, in which the titanium dioxide composite powder is prepared by mixing titanium dioxide with a silicone elastomer and coating the mixture with polymethylsilsesquioxane, such that a formulation containing the titanium dioxide composite powder can naturally cover the skin surface and can be smoothly applied to the skin without agglomeration.
Background Art
Powders which are frequently used in cosmetic products have inherent characteristics and show various functions depending on their characteristics. Generally, inorganic pigment powders are subjected to various processes, including a mixing process for making composite powders and a surface

modification process, depending on the characteristics of cosmetic products containing them, in order to overcome their shortcomings. Among these processes, the mixing process for making composite powders is frequently used to modify the overall characteristics of powders so as to meet the desired purpose.
Meanwhile, powders can be broadly divided, according to function, into coloring pigments, white pigments, extender pigments, and functional pigments.
The coloring pigments serve to adjust the color tone of products, and examples thereof include Bengala, iron oxide yellow, iron oxide black, chromium oxide, and carbon black. The white pigments can adjust coverage in addition to color tone, and examples thereof include titanium dioxide and zinc oxide. The extender pigments are diluents which are used to adjust color tone and, at the same time, to adjust the touch feeling (extensibility or adhesion) or gloss of products and to maintain the formulation of products. Examples of the extender pigments include talc, mica, sericite, and boron nitride.
Among these powders which are used in cosmetic products, the white pigments will be described in further detail. Among the white pigments, titanium dioxide (Ti02) is generally used to cover skin defects, including irregularities and wrinkles, thereby making the skin clean and luxurious. However, titanium dioxide (Ti02) has various shortcomings, including hard touch

feeling, agglomeration and unnatural feeling, and for this reason, processes such as mixing and surface modification are frequently used to improve the above shortcomings. In the case of titanium dioxide, a technique of mixing titanium dioxide with extender pigments, such as talc, mica, sericite or boron nitride, is used to improve the shortcomings of titanium dioxide or to impart new properties to titanium dioxide. However, such composite powders still have shortcomings in that they show hard touch feeling and are not smoothly applied to cause agglomeration.
Disclosure Technical Problem
Accordingly, the present invention have conducted studies to improve the shortcomings of titanium dioxide, including rough touch feeling and agglomeration, while maintaining the high ability of titanium dioxide to cover the skin surface. As a result, the present inventors have found that the use of a titanium dioxide composite powder prepared by mixing titanium dioxide with a silicone elastomer and coating the mixture with polymethylsilsesquioxane can prepare a base makeup composition, which can naturally cover the skin surface and can be smoothly applied to the skin surface, thereby completing the present invention.

Therefore, it is an object of the present invention to provide a makeup composition, which contains a titanium dioxide composite powder, and thus can naturally cover the skin surface and has smooth touch feeling without agglomeration.
Technical Solution
The present invention provides a composite powder obtained by mixing titanium dioxide with a silicone elastomer and coating the mixture with polymethylsilsesquioxane (PMSQ).
Titanium dioxide (Ti02) which is used in the present
invention preferably has an average particle size of 0.1-10 um.
As the particle size becomes smaller, the ability of the powder to cover the skin surface becomes higher. However, if the
particle size is larger than 10 um, the ability of the powder to
cover the skin surface will be reduced, and the touch feeling of a powder-type cosmetic product containing the composite powder will become rough. For this reason, a titanium dioxide composite powder having an average particle size larger than 10
um is not suitable for use in cosmetic products.
The silicone elastomer that is • used in the present invention is preferably a dimethicone/vinyl dimethicone crosspolymer. In the process of mixing the titanium dioxide

with the silicone elastomer, the silicone elastomer is used in an amount of 30.0-50.0 wt% based on the total weight of the titanium dioxide composite powder. If the content of the silicone elastomer in the composite powder is more than 50 wt%, the ability of the titanium dioxide to cover the skin surface will be reduced, and if the content of the silicone elastomer is less than 30 wt%, the composite powder will show the rough touch feeling of titanium dioxide and will not be uniformly applied.
Polymethylsilsesquioxane (PMSQ), a silicone-based resin, which is used in the present invention, refers a T-resin containing three Si-0 bonds, as represented by the following formula 1. It is generally called an "organopolysiloxane" having Si-CH3 attached thereto, and it has -OH reactive groups allowing the surface of titanium dioxide to be chemically coated with the silicone elastomer (dimethicone/vinyl dimethicone crosspolymer) and serves to impart water resistance and oil resistance.
[Formula 1]

The polymethylsilsesquioxane is used in an amount of 2-5 wt% based on the total weight of the titanium dioxide composite

powder to coat the powder mixture of the titanium dioxide and the silicone elastomer. If the content of the polymethylsilsesquioxane coating in the composite powder is less than 2 wt%, the adhesion of the powder to the skin will be reduced, and if the content of the coating is more than 5 wt%, the powder will be non-uniformly applied to the surface.
Hereinafter, the process of mixing titanium dioxide with the silicone elastomer (dimethicone/vinyl dimethicone crosspolymer) and the process of coating the mixture with the polymethylsilsesquioxane resin will be described in further detail.
(1) Step 1: Preparation of titanium dioxide
Titanium dioxide to be coated is dried in a dryer at
105 °C for 4 hours or more.
(2) Step 2: Formation of composite with silicone
elastomer
The titanium dioxide prepared in step 1 is introduced into a Hensel mixer in which it is mixed with a silicone elastomer at high speed, thereby preparing a titanium dioxide composite powder. Herein, the weight ratio between the titanium dioxide and the silicone elastomer in the titanium dioxide compositer powder is in the range from 5:5 to 7:3. If the weight ratio is more than 5:5, the touch feeling of the powder will be smooth, but the ability of the powder to cover

the skin surface will be significantly reduced, and if the weight ratio is less than 7:3, the ability of the powder to cover the skin surface will be excellent, but the rough touch feeling of titanium dioxide will appear. For this reason, the above-specified weight ratio is most preferable.
(3) Step 3: Coating with polymethylsilsesquioxane
Polymethylsilsesquioxane is sprayed onto the composite
powder, obtained in step 2, in an amount of 2-5 wt% based on the total weight of the composite powder, and then is mixed and dispersed for 15-600 seconds, preferably 30-300 seconds.
(4) Step 4: Heat treatment
After the dispersion process in step 3 has been carried
out, the resulting powder is dried at 120~150 °C for 4 hours or
longer, thereby completing the process of coating with the polymer.
A cosmetic makeup composition according to the present invention contains, based on the total weight of the composition, 0.1-10.0 wt% of the titanium dioxide composite powder prepared according to the above-described method. If the content of the composite powder in the makeup composition is less than 0.1 wt%, the composition will not be smoothly and uniformly applied to the skin, and the ability thereof to cover the skin surface will be insufficient. On the other hand, if the content of the powder in the composition is more than 10

wt%, the formulation stability of the composition will be reduced.
The makeup composition containing the titanium dioxide composite powder, when used as a formulation, can be smoothly applied to the skin surface without agglomeration, can be naturally expressed, and also has an excellent effect of covering skin blemishes.
The composition can be formulated into various forms, including a makeup primer, a foundation, a makeup base, a two-way cake, a cosmetic compact, a powder, and an eye shadow.
In addition, the present invention provides a cosmetic makeup composition containing said titanium dioxide composite powder.
Advantageous Effects
The titanium dioxide composite powder according to the present invention is prepared by mixing titanium dioxide with a silicone elastomer and coating the mixture with polymethylsilsesquioxane. A base makeup composition containing the titanium dioxide composite powder can be smoothly applied to the skin without agglomeration, and it can restore the natural skin texture and show an effect of covering the skin surface.

Best Mode
Hereinafter, the present invention will be described in further detail with reference to examples and test examples. However, these examples are provided for a better understanding of the present invention and are not limited to these examples in any way.
Example 1: Preparation of titanium dioxide composite powder
70 g of titanium dioxide was dried at 105 °C for 4 hours
or longer, and then introduced into a Hensel mixer in which it was mixed with 30 g of a silicone elastomer (dimethicone/vinyl dimethicone crosspolymer) . Next, 2.1 g of PMSQ was sprayed onto and mixed with the mixture, after which the mixture was
heat-treated at 120~150 °C for 4 hours, thereby obtaining 100.3
g of a titanium dioxide composite. In this Example, the used titanium dioxide was C47-056 (Sunchemical Corp, USA), and the used silicone elastomer was DC 9506C (Dow Corning Corp., USA), and also the used PMSQ was a PMSQ prepared by polymerizing methyltriethoxysilane (GE Toshiba Corp.).
Comparative Example 1: preparation of titanium dioxide powder coated with alkylsilane
100 g of titanium dioxide (CR50; Ishihara Co., Ltd.,

Japan) was dried at 105 °C for 4 hours or longer, and then
introduced into a Hensel mixer in which 2.1 g of triethoxycaprylylsilane was sprayed onto and mixed with the mixture. Then, the resulting mixture was heat-treated at
120~150 °C for 4 hours, thereby obtaining 102.1 g of a titanium
dioxide coated with alkylsilane.
Test Example 1: Comparison of skin texture correction In order to examine the skin texture correction effect of a cosmetic composition containing the titanium dioxide composite powder according to the present invention, a cosmetic compact containing the titanium dioxide composite powder prepared in Example 1 was prepared using the composition shown in Table 1 below according to a conventional method. For comparison, a comparative formulation 1 containing the coated titanium dioxide powder prepared in Comparative Example 1 was also prepared. [Table 1]

Components Formulation 1 (wt%) Comparative
formulation 1
(wt%)
Talc 44.7 44.7
Sericite 20.0 20.0
Silica 10.0 10.0
Micro titanium dioxide 8.0 8.0
Zinc oxide 3.0 3.0
Titanium dioxide 5.0

composite powder of Example 1
Coated titanium dioxide
powder of Comparative
Example 1 - 5.0
Iron oxide 2.0 2.0
Mineral oil 7.0 7.0
Preservative 0.3 0.3
Each of formulation 1 and comparative formulation 1, prepared as described above, was applied to the wrist, and the degree of wrinkles on the skin surface was measured using an image analyzer (Primos hand held device; GFM GmbH), thereby evaluating the skin texture correction effect of each formulation. For this purpose, each formulation was applied twice to the wrist of each of two women in their 20s and two women in their 30s in the lengthwise direction using a cosmetic puff, and the degree of wrinkles on the skin surface was measured. The results of measuring the depth of wrinkles before and after application of each formulation are shown in Table 2 below.
[Table 2]

Formulation 1 Comparative formulation 1
Skin texture correction 37% 20%
As can be seen from the results in Table 2 above, the use

of comparative formulation 1 also showed an effect on skin texture correction, but formulation 1 containing the titanium dioxide composite powder according to the present invention was smoothly applied to restore the natural skin texture, indicating that formulation 1 has an excellent effect on skin texture correction compared to comparative formulation 1. Test Example 2: Test for smoothness properties 0.015 g of each of the powders prepared in Example 1 and Comparative Example 1 was applied to artificial leather, and a rheometer was placed on the artificial leather applied with each powder, thereby evaluating the smoothness of each powder. The results of the evaluation are shown in Table 3 below. [Table 3]

Smoothness
Example 1 104
Comparative Example 1 150
As can be seen in Table 3 above, Comparative Example 1 showed a value higher than 140 at which the skin feels rough, suggesting that the touch feeling of a cosmetic composition containing the powder of Comparative Example 2 is poor. However, Example 1 showed a value lower than 110 at which the skin generally feels smooth, suggesting that a cosmetic composition containing the titanium dioxide composite powder of the present invention can show smooth touch feeling.

Test Example 3: Evaluation of touch feeling by panels The covering ability, smoothness, thickness feeling and application properties of each of formulation 1 and comparative formulation 1 were evaluated by applying each formulation directly to the face of each of 20 female consumer panels in their 20s to 30s. Specifically, each of formulation 1 and comparative formulation 1 was applied to the skin of each panel, and sensory evaluation was performed before and after the application of each formulation. The results of the evaluation are shown in Table 4 below. [Table 4]

Covering ability Smoothness Thickness feeling Application properties
Formulation
1 o (excellent) ® {very excellent) ® (thin) ® (very excellent)
Comparative
formulation
1 ® (very excellent) A (slight) A (thick) a (slight)
® : very excellent, o : excellent, A : slight, x :
none
As can be seen from the results in Table 4 above, the use of comparative formulation 1 containing the coated titanium dioxide powder showed excellent skin-covering ability compared to the use of formulation 1 containing the titanium dioxide composite powder of the present invention. However,

formulation 1 showed much better results in terms of smoothness, thickness feeling and application properties, indicating that the overall feeling of use of formulation 1 is significantly excellent.

WE CLAIM :
1. A titanium dioxide composite powder prepared by mixing a titanium dioxide powder with a silicone elastomer and coating the mixture with polymethylsilsesquioxane.
2. The titanium dioxide composite powder of claim 1, wherein the titanium dioxide has an average particle size of
0.1-10 um.
3. The titanium dioxide composite powder of claim 1, wherein the silicone elastomer is a dimethicone/vinyl dimethicone crosspolymer.
4. The titanium dioxide composite powder of claim 1, wherein the silicone elastomer which is mixed with the titanium dioxide is used in an amount of 30.0-50.0 wt% based on the total weight of the titanium dioxide composite powder.
5 The titanium dioxide composite powder of claim 1, wherein the polymethylsilsesquioxane is used in an amount of 2-5 wt% based on the total weight of the titanium dioxide composite powder to coat the mixture of the titanium dioxide and the silicone elastomer.

6. Use of the titanium dioxide composite powder according to any one of claims 1 to 5 for preparation of a cosmetic makeup composition.
7. A cosmetic makeup composition containing the titanium dioxide composite powder according to any one of claims 1 to 5.
8. The cosmetic makeup composition of claim 7, wherein the titanium dioxide composite powder is contained in an amount of 0.1-10.0 wt% based on the total weight of the composition.