JPH09208427A - Powder cosmetic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a powder cosmetic excellent in slip, extension, touch feeling and finishing on the skin as well as persistency by combining modified powder excellent in adhesiveness with elastic powder excellent in extension. SOLUTION: This powder cosmetic is obtained by combinedly using (A) modified powder (in an amount of 0.5-30wt.%) obtained by carrying out uniform coating treatment of the surface of mixed powder of fine particle powder having 0.001-0.1μm average primary particle diameter with laminar powder with an acylated amino acid and (B) a granular material of silicone (in an amount of 0.2-30wt.%). The fine particle powder used as a raw material for the component A includes e.g. fine particle titanium oxide or fine particle titanium oxide and the laminar powder includes e.g. barium sulfate or silk powder and the acylated amino acid includes e.g. N-lauroyl-L-lysine. A wet type coating treatment is preferably used as a method for carrying out coating treatment of powder surface with the acylated amino acid. A material obtained by forming, e.g. a crosslinked elastomer of dimethylsilicone into fine particle powder having 1-100μm primary particle diameter is preferably used as the component B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to powder cosmetics, and more specifically, spreadability on skin, spreadability, feel,
The present invention relates to a powder cosmetic having an excellent finished feeling and a long-lasting makeup.

[0002]

2. Description of the Related Art In powder cosmetics such as foundations and white powders, in addition to finishing functions such as face correction and skin color correction, it is desired to have a pleasant feel when applied to the skin. It is rare.

Conventionally, powder cosmetics have been blended with extender pigments such as mica, talc and sericite, but these extender pigments alone are not sufficient in feeling,
Spherical particles are used for the purpose of obtaining a better feel.

However, such spherical particles have the property of poor adhesion to the skin in terms of particle size and shape, and the drawback is that the longevity of makeup deteriorates if a large amount of them is incorporated. is there. Therefore, there is a demand for a powder cosmetic having a better feel and excellent in the durability of makeup.

[0005]

Means for Solving the Problems The inventors of the present invention have made extensive studies in view of the above points, and as a result, by using a modified powder having excellent adhesiveness and an elastic powder having excellent spreadability in combination, Then, they have found that a powder cosmetic having an excellent feel and a long-lasting makeup can be obtained, and have completed the present invention.

That is, according to the present invention, (A) a mixed powder surface composed of fine particle powder having an average primary particle diameter of 0.001 to 0.1 μm and flaky powder is uniformly coated with an acylated amino acid. 0.5-30% by weight of the obtained modified powder
And (B) 0.2 to 30 parts by weight of the silicone powder granules are provided.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The fine particle powder used as the raw material for the component (A) in the present invention is not particularly limited as long as it has an average primary particle diameter of 0.001 to 0.1 μm. Examples thereof include titanium oxide, fine particle zinc oxide, fine particle silica and the like. The average primary particle size of the fine particle powder is 0.0
If the average particle size is less than 01 μm, the resulting powder cosmetic will have a poor feeling in use, and industrial production of the powder will be difficult. If the average primary particle size exceeds 0.1 μm, the cosmetic film will be whitish. The average primary particle size of the powder is 0.00
It must be in the range of 1 to 0.1 μm. Examples of the method of measuring the average primary particle diameter include a method of measuring the particle diameter by observation with a scanning electron microscope or a transmission electron microscope.

The flaky powder used as the raw material for the component (A) in the present invention is not particularly limited as long as it is a powder that suppresses agglomeration of fine particle powder and enhances dispersibility. The flaky powder here includes plate-like powder and scale-like powder, and preferably has a thickness of 0.001 to the major axis.
It refers to one in the range of 0.15. Within this range,
It has very high ability to suppress aggregation of fine particle powder and to disperse it uniformly. Examples of these flaky powders include barium sulfate, silk powder, talc, sericite, kaolin, titanium mica, calcium carbonate, magnesium carbonate,
One or more selected from aluminum silicate, magnesium sulfate, and the like, and surface-treated powders thereof are included. Of these, barium sulfate is particularly preferable because it has an excellent feeling in use and has a high effect of dispersing fine particle powder.

The amount of the flaky powder used in the present invention depends on the kind, size and shape of the powder, but the fine powder 1
It is preferably 2.5 to 50 parts by weight with respect to 00 parts by weight. Within this range, it is possible to sufficiently exert the effect of increasing the transparency of the modified powder and the effect of smoothing the feel while maintaining the high adhesion of the fine particle powder.

In the present invention, the method for obtaining the mixed powder from the fine particle powder and the flaky powder is, for example, a method in which both are dry mixed using a juicer mixer or a suitable solvent such as water or ethanol. After adding both and stirring well, the solvent is removed, followed by drying and pulverization.

Further, the acylated amino acid used as the raw material of the component (A) in the present invention is N-lauroyl-
Lysine derivatives such as L-lysine, N-lauroyl-D-lysine, N-palmitoyl-L-lysine, N-stearoyl-L-lysine, N-palmitoyl-L-serine, N-
An acylated amino acid having a long-chain aliphatic acyl group such as a serine derivative such as stearoyl-L-serine can be mentioned. Of these, N-lauroyl-L-lysine is particularly preferable from the viewpoint of the feeling of use of the modified powder produced and the cost of raw materials.

The amount of the acylated amino acid used in the present invention is preferably 0.5 to 50 parts by weight based on 100 parts by weight of a mixed powder composed of fine particle powder and flaky powder. Within this range, without impairing the adhesion of the mixed powder to the skin,
Sufficient smoothness can be imparted to the modified powder.

In the present invention, as a method for uniformly coating the surface of a mixed powder consisting of fine particle powder and flaky powder with an acylated amino acid, from the viewpoint of the effect of the present invention, wet coating is performed. The method is preferred. As a wet coating method, for example, when the mixed powder is uniformly dispersed in a suitable solvent, an acylated amino acid dissolved in a suitable solvent is added, and pH control, temperature control, or the like is appropriately performed. Another method is to reprecipitate the acylamino acid on the surface of the mixed powder, followed by filtration, drying and pulverization.

The modified powder thus obtained has a uniform layer of the acylated amino acid in a thin layer while the highly adherent fine particle powder is uniformly dispersed around the flaky powder. The powder has a high affinity to the skin and a sufficient adhesiveness.

In the present invention, the amount of the above-mentioned modified powder as the component (A) to be blended in the powder cosmetic varies depending on the characteristics of the product, but it is 0. 5
３０30% by weight. If it is less than 0.5% by weight, a sufficient effect cannot be obtained, and if it exceeds 30% by weight, elongation becomes heavy.

The component (B) of the present invention, a silicone powder granule, is a substance obtained by the method described in, for example, JP-A-61-194009, which is an aggregate of a cured organopolysiloxane and has a spherical shape. There is no particular limitation as long as it is an organopolysiloxane cured product that forms aggregates with primary particles. For example, a dimethyl silicone cross-linked elastic material with a spherical shape
It is preferable that the primary particles have a particle size of ˜100 μm. This agglomerate has elasticity, and when it is applied on the skin, the agglomerate is pressed against the skin by the pressure of application and at the same time causes a roll-like disintegration. Therefore, when the application pressure is applied from obliquely above the application surface during application, the powder near the interface with the application surface adheres to the application surface, and the upper powder moves quickly to the position immediately beside it. I will do it. By repeating this cycle, the adhesion of the powder, the slippage, and the soft feeling are both achieved. As the dimethyl silicone crosslinked elastic body, for example, a spherical shape and an average particle size of 3 μm
Toray, a white fine powder (particle size distribution: 1 to 15 μm)
Trefill E- from Dow Corning Silicone Co., Ltd.
506C (trade name) and the like.

Another example of the silicone powder granules used in the present invention is a cured organopolysiloxane containing silicone oil obtained by the method described in JP-A-2-243612. An example of the silicone oil is a silicone oil that is liquid at room temperature and has a viscosity of 10 to 1000 centistokes at 25 ° C. For example, Toray Dow Corning Silicone Co., Ltd., which is a white fine powder having a spherical shape and an average particle size of 3 μm (particle size distribution: 1 to 15 μm), containing dimethyl silicone oil inside a crosslinked dimethyl silicone elastic material ) Made of trefil E-505C (trade name) and the like.

In the present invention, the amount of the above-mentioned silicone powder granules as the component (B) to be added to the powder cosmetic is 0.
2 to 30% by weight, preferably 0.5 to 15% by weight
It is. If it is less than 0.2% by weight, the blending ratio with respect to other powders will be small, so that the effect of blending the silicone powder granules cannot be sufficiently imparted to the powder cosmetic, and if it exceeds 30% by weight, the silicone powder granules will be sufficient. The elasticity of the powder cosmetic impairs the shapeability of the powder cosmetic.

Examples of the powder cosmetics of the present invention include powder foundation, white powder, face powder, eye shadow, pressed powder, cheek color, liquid foundation, oil foundation, lipstick and the like. In particular, as powder cosmetics capable of remarkably exerting the effect of the present invention, powder foundation, white powder, face powder, eye shadow, pressed powder, cheek color powder, or a die-cast product thereof.

In addition to the above-mentioned modified powder and silicone powder granules, the powder cosmetics of the present invention include powders, colorants, oils, humectants, and surface active agents that are usually used in powder cosmetics. Agents, bactericides, fragrances, solvents, salts, adhesives, polymers, preservatives and the like can be added at the same time. In particular, regarding powders, conventionally known inorganic powders, organic powders, pigments, and composite powders thereof, and powders that have been subjected to surface treatment such as silicone treatment, fluorine compound treatment, metal soap treatment, and oil treatment. The kind is mentioned. Further, in some cases, the modified powder of the present invention can be further surface-treated by a conventionally known surface treatment method.

[0021]

The present invention will be described in detail below with reference to examples and comparative examples. The sensory characteristic test method used in the examples is as follows.

Sensory property test method Regarding the powder cosmetics of the examples and the comparative examples, the expert panelist 2
A sensory test was conducted by 0 people, and when using powder cosmetics,
The four items of "lightness of elongation", "softness of feel", "naturalness of finish" and "persistence of makeup with time (no makeup collapse)" were evaluated. The evaluation was made according to the following 5 grades (5; very good, 4; good, 3; normal, 2; bad, 1; very bad), and the average values of 20 people are shown in Table 3 and Table 4. .

The die surface of the product was observed for each of the examples and comparative examples. The observation results are shown in Tables 3 and 4 together with the results of the sensory characteristic test.

Production Example 1 (Production of Modified Powder Used in Example 1 and Comparative Examples 1 to 4) Fine Particle Zinc Oxide (Average Primary Particle Diameter 0.02 μm) 76
g and tabular barium sulfate (major axis 3 to 10 μm, minor axis 1 to 5
19 μm (μm, thickness 0.1 to 0.3 μm) was well mixed by stirring using a juicer mixer. This was dispersed in a mixed solution of 6.9 g of 6N hydrochloric acid and 650 g of purified water by stirrer stirring for which ultrasonic waves were used in combination for 15 minutes. In addition, N
A solution of 5 g of lauroyl-L-lysine dissolved in a mixed solution of 8.7 g of a 5N sodium hydroxide aqueous solution and 65 g of purified water was slowly added over 20 minutes, and re-precipitated on the surface of the mixed powder. Then, pH of the solution with a pH meter
After completion of neutralization with 1N hydrochloric acid or 1N sodium hydroxide aqueous solution, the mixture was stirred for 15 minutes. The dispersion was filtered under reduced pressure, washed with water several times, and then it was confirmed with a salinometer that sodium chloride was completely removed. The obtained powder was transferred to a metal vat and dried for 12 hours with a blow dryer set at 85 ° C. The dried powder is crushed with a mixer,
98.2 g (yield 98.2%) of modified powder was obtained.

The modified powder obtained in Production Example 1 above was added with N by an electron microscope and infrared absorption spectrum analysis.
-It was confirmed that almost all of lauroyl-L-lysine was uniformly coated on the surface of the mixed powder. That is, from the result of the electron microscope observation, it was found that N-lauroyl-L-lysine was uniformly covered with a thin layer while the fine particle zinc oxide was uniformly dispersed around the flaky powder. I was able to confirm that it is taking.

Production Example 2 (Production of Modified Powder Used in Example 2 and Comparative Examples 5 to 8) Fine Titanium Oxide (Average Primary Particle Diameter 0.07 μm) 7
6 g and 19 g of the plate-shaped barium sulfate used in Production Example 1 were well mixed by stirring using a juicer mixer. This is 6
A mixed solution of N hydrochloric acid (6.9 g) and purified water (650 g) was dispersed for 15 minutes by stirrer stirring with ultrasonic waves. To this, 5 g of N-lauroyl-L-lysine dissolved in a mixed solution of 8.7 g of a 5N sodium hydroxide aqueous solution and 65 g of purified water was slowly added over 20 minutes, and re-precipitated on the mixed powder surface. It was Further, through the same operation as in Production Example 1, 98.0 g of modified powder (yield 98.0%) was obtained.
It was confirmed by an electron microscope and an infrared absorption spectrum analysis that the obtained powder had almost all of the added N-lauroyl-L-lysine uniformly coated on the surface of the mixed powder.

Example 1, Comparative Examples 1 to 4 (Powder Foundation) According to the formulation shown in Table 1, powder foundations were prepared. The modified powder used was that produced in Production Example 1.

[0028]

[Table 1]

After the powders were mixed using a mixer, an oil agent component was added and further mixed. After passing the obtained mixed powder through 60 mesh, it was punched on a metal plate using a metal mold,
The product powder foundation was obtained.

Example 2, Comparative Examples 5 to 8 (Powder Eye Shadow) According to the formulation of Table 2, powder eye shadow was prepared.
The modified powder used was that produced in Production Example 2.

[0031]

[Table 2]

After the powders were mixed using a mixer, an oil agent component was added and further mixed. After passing the obtained mixed powder through 60 mesh, it was punched on a metal plate using a metal mold,
I got the powder eye shadow of the product.

Table 3 shows the results of the sensory characteristic test of Example 1 and Comparative Examples 1 to 4.

[0034]

[Table 3]

From the results shown in Table 3, Example 1 has a light elongation.
It is superior to Comparative Examples 1 to 4 in the overall evaluation of the five items of softness of touch, natural finish, durability of makeup over time, and uniformity of surface of the die.

Table 4 shows the results of the sensory characteristic test of Example 2 and Comparative Examples 5-8.

[0037]

[Table 4]

From the results shown in Table 4, Example 2 has a light elongation.
It is superior to Comparative Examples 5 to 8 in the overall evaluation of the five items of softness of touch, natural finish, durability of makeup over time, and uniformity of surface of the die.

[0039]

From the above, the present invention provides a modified powder obtained by uniformly coating the surface of a mixed powder comprising fine particle powder and flaky powder with an acylated amino acid, and a silicone powder granule. It is clear that the addition of and provides a powder cosmetic excellent in extensibility on the skin, extensibility, feel and finish, and at the same time, excellent in durability of makeup over time.

Claims (1)

[Claims] 1. (A) The average primary particle diameter is 0.001 to
0.5 to 30% by weight of a modified powder obtained by uniformly coating the surface of a mixed powder consisting of 0.1 μm fine particle powder and flaky powder with an acylated amino acid, and (B) a silicone powder Powder cosmetics, characterized by containing 0.2 to 30% by weight of granules.