JPS63166819A - Make up cosmetic - Google Patents

Abstract

PURPOSE:To obtain the titled cosmetic satisfying adhesion, extension and proper gross at the same time and providing humid touch and natural and beautiful finish, by blending a synthetic laminar metal oxide having a specific size and refractive index as a pigment. CONSTITUTION:A synthetic laminar metal oxide (e.g. silica-alumina, silica- magnesia) having 0.1-2mu, especially 0.2-1mu average thickness, 1-100mu, especially 2-4mu average thickness defined by average of (longest diameter + shortest diameter) per 100 laminar/2, and 1.35-1.44 refractive index is blended as a pigment. The gross and transparency of cosmetic can be readily changed by moderately changing refractive index of the metal oxide.

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a make-up cosmetic, more specifically a make-up cosmetic containing a synthetic flaky metal oxide having a specific size and refractive index as a pigment. Regarding.

Cosmetics are broadly divided into basic cosmetics and makeup cosmetics.

Among these, make-up cosmetics are intended to apply appropriate coverage and color to the skin, and specific examples thereof include foundation, pressed powder, lipstick, and eye shadow.

(Conventional technology) Make-up cosmetics coat the skin with appropriate gloss and transparency, improve spreadability and adhesion, and remove makeup from secretions such as sweat and oil. Various bases are used to prevent the product from crumbling, improve the feel during use, and improve the moldability of the product, and coloring agents are used to add color.

As the base, various raw materials are used, such as talc and other substances, fats and oils, hydrocarbons, and surfactants.

Various types of extender pigments are known, but these alone do not provide the necessary luster or luster as an extender pigment.
Spreadability and adhesion were not met.

For example, talc, mica, kaolin, sericite, etc. are known as natural layered clay minerals.
Mica and sericite have poor adhesion, and kaolin, precipitated calcium carbonate, etc. are used to improve adhesion, but these have no spreadability at all.

Therefore, these are combined into a foundation,
It is included in powdered white powder, solid white powder, lipstick, blusher, etc.

In addition, these clay minerals contain impurities, hydroxyl groups, alkali metals, etc., so they contain oils and fats, which are cosmetic ingredients.
When coexisting with fragrances, etc., there are problems such as making the oils and fats rancid and changing the quality of the fragrances.
12), a method of treatment with polyamino acids (Japanese Patent Application Laid-open No. 5
7-145006), but it requires a complicated process and impurities cannot be completely removed, and due to these impurities (e.g. iron oxide), what should originally be white becomes yellowish brown. It has the disadvantage of being colored.

In addition, as a flaky pigment, a flaky pigment having a thin layer of a high refractive index metal oxide on the surface of platelet crystals of barium sulfate with a thickness of 0.05 to 1 μm (hereinafter abbreviated as μ) and a size of 5 to 100 μm is used. has also been proposed (Japanese Unexamined Patent Publication No. 48-5683)
3), the process of depositing barium sulfate and then depositing metal oxide is long, and the thickness of the thin layer of metal oxide obtained in this way is 0. Since it exhibits pearlescent luster in the range of O1 to 0.1μ, it has the drawback of being too shiny as an extender pigment.

Furthermore, there have been attempts to crush titanium mica, which is originally used as a pearl pigment, to reduce its luster and use it as an extender pigment, but this has the drawback of insufficient spreadability.

(Problems to be Solved by the Invention) The present inventors have developed an artificially synthesized low refractive index flaky metal oxide as a pigment, particularly an extender pigment, into makeup cosmetics to improve the appearance of conventional cosmetics. The present invention was completed based on the discovery that an excellent feel during use and stability over time, which cannot be obtained with other methods, can be obtained.

(Means for solving the problem) Average thickness is 0.1μ to 2μ, average size is 1μ to 1μ
This is a makeup cosmetic characterized by containing a synthetic flaky metal oxide having a refractive index of 1.35 to 1.44.

The present invention will be explained in detail below.

Since flakes generally have a distribution, the size is the average size,
In other words, it is defined by the average value of (the longest across diameter of the flake + the shortest across diameter of the flake)/2 for 100 flakes, and the thickness is also defined by the average thickness, that is, the average value for 100 flakes. do.

The synthetic flaky metal oxide of the present invention has a refractive index of 1.35.
~1.44 is applicable.

This is because the refractive index of oils normally used in cosmetics is 1.5~
Since the value is 1.6, if the value deviates significantly from this value, the transparency will be impaired.

An example of a metal oxide exhibiting such a refractive index is silica.

The refractive index of silica varies depending on the manufacturing method, crystal shape, etc., and for tridymite it is 1.47. 1.48 for cristobalite,
For quartz, the value is about 1.55, but for amorphous crystals synthesized at a low temperature below the melting point, the value is 1.35 to 1.44.

This is probably because the structure of the low-temperature synthetic product is not yet sufficiently dense.

The refractive index of the composite or mixed oxide mainly composed of silica thus produced also falls within this range.

Examples include silica-alumina, silica-magnesia, silica-calcia, silica-calcia-sodium oxide, etc. synthesized at low temperature.

Furthermore, the refractive index of a mixed oxide containing silica can be arbitrarily changed depending on its composition ratio.

For example, a mixed oxide with a weight ratio of alumina/silica=10/90 has a refractive index of about 1.4.

The refractive index of natural materials such as mica, talc, and kaolin is around 1.5 and has no range, but if synthetic flaky metal oxides are used, the refractive index can be easily adjusted to an even lower refractive index region as described above. It is possible to do so.

The synthetic flaky metal oxide used in the present invention has an average thickness of 0.1μ to 2μ and an average size of 1μ to 100μ.
It has a moderate luster and is not cloudy.

If the average thickness is less than 0.1 μm, the reflectance will be high, the mechanical strength will be decreased, and it will be easy to break.

The average thickness is 0.1μ or more, preferably 0.2μ or more.

When the average thickness is 0.1 μm or more, the metallic luster decreases rapidly, and when the average thickness is 0.2 μm or more, it becomes very low.

However, if the average thickness exceeds 2μ, the adhesion to the skin will decrease and the range of use will decrease.

Preferably it is 2μ or less, more preferably 1μ or less.

If the average size is smaller than 1 μm, appropriate gloss is lost, adhesion is good but spreadability is completely lost, and transparency is lost.

The larger the average size, the better the spreadability, but if the average size exceeds 100μ, the particles tend to separate and the purpose of uniformly covering the skin cannot be achieved.

Therefore, the average size is preferably 100μ or less, more preferably 40μ or less.

Therefore, the average thickness is 0.1~2μ, the average size is 1~
A flaky metal oxide of 70μ is preferred, with an average thickness of 0.
A flaky metal oxide having an average size of 2 to 1 μm and an average size of 2 to 40 μm is more preferred.

The synthetic flaky metal oxide used in the present invention can be produced by various methods.

For example, flaky alumina can be produced by reacting high-purity aluminum with mercury in the presence of hydrochloric acid, and then reacting with hydrogen peroxide and alcohol (Japanese Unexamined Patent Publication No. 152999/1982), or by using a hot aqueous solution of acetic acid and aluminum sulfate. method (Japanese Unexamined Patent Publication No. 54-24298), a method for producing from an acyloxy group-containing metal compound (Japanese Patent Application No. 59-311)
For flaky silica, a method of contacting potassium silicate with a mineral acid (Japanese Patent Application Laid-open No. 11839/1983)
Publication No. 9), etc.

As a method for preparing flaky metal oxides of a specific size, the flaky metal oxides obtained by the above method are pulverized using a dry ball mill, wet ball mill, vibration mill, roll mill, jet mill, etc. vibrating screens such as gyro sifters and hammer screens;
Wet classification methods such as spiral classifiers or hydraulic classifiers, dry classification methods such as dynamic or centrifugal wind classifiers, or methods that combine one or more classification processes such as flotation methods, etc. (Powder Engineering Handbook, edited by Kou Iitani, published by Asakura Shoten).

The blending ratio of the flaky metal oxide thus obtained in makeup cosmetics is similar to the blending ratio of conventional body 11H materials, and varies depending on the type of cosmetic.

Of course, it may be used in combination with conventional extender pigments and pearl pigments.

Specifically, for example, 2% by weight or more for oil-based foundations.
60% by weight, and 20% to 90% by weight for pressed powder and pressed foundation.

In general, if the blending ratio is less than this, the effect of the present invention will not be significant, and if it is more than this, it will be mostly just powder, and the feel during use, such as moist feeling, will be reduced.

In addition, synthetic flaky metal oxides include coloring agents, such as colored metal oxides such as iron oxide, chromium oxide, and cobalt oxide, metal complex salts such as iron cyanide, colored metal hydroxides such as iron hydroxide, and red coloring agents. It may be coated with an organic dye such as No. 2 or Yellow No. 4, or an organic pigment such as an aluminum lake thereof, and then used as a colored extender pigment.

As a method for blending these flaky metal oxides into cosmetics, known mixing methods such as a Henschel mixer, a ribbon mixer, a type blender, etc. can be used.

<Example) Hereinafter, the present invention will be explained in more detail using Examples.

The light reflectance value (the higher the value, the closer to metallic luster) was measured by the following method.

Measurement of Reflectance A pigment substance was added to nitrocellulose lacquer at a concentration of 10% by weight to obtain the following test solution.

Pigment substance 10 parts by weight Nitrocellulose R3I/4 16 parts by weight Isopropyl alcohol 7 parts by weight Isoamyl acetate
35 parts by weight n-butyl acetate 29 parts by weight diethylene glycol mobutyl ether 3 parts by weight After thorough dispersion and mixing, the mixture was fixed on a surface plate.

75μ with a doctor blade on black and white hiding power chart paper
A film was formed by spreading and solidifying the film to a thickness of .

The film on the black part of this chart paper is JIs-28
The surface gloss was measured according to the specular gloss measurement method of No. 741 at an incident angle of 20 degrees and a reflection angle of 20 degrees.

This surface glossiness was defined as the reflectance.

(Conventional extender pigments such as sericite and talc have 5 to 3
The range is 0%. ) The reflectance of the flaky metal oxide of the present invention is shown in Table 1, and the reflectance of conventional pigment materials is shown in Table 2.

Incidentally, the size and thickness of the particles were measured using a scanning electron microscope.

The cosmetics were subjected to a sensory test by 20 women regarding spread, adhesion, smoothness, gloss, and color feel, and were evaluated on a five-point scale with the highest score being 5 points.

Table 1 Table 2 Reflectance of pigments Example 1 and Comparative Examples 1-2 Silica sol (Ludox'l"H3-40, E.

1, manufactured by Aupont) was diluted with water to give a silica concentration of 15% to prepare a stock solution.

Put this in a vat and roll a roll with a diameter of IQcm at room temperature.
It was immersed in this liquid and rotated at a circumferential speed of 2 m/min.

Next, air at 120° C. was flowed at a flow rate of 1 m/sec onto the roll to which the stock solution was attached.

This removes the water from the liquid film of the stock solution and forms a gel-like silica film on the roll.

Further water removal causes volumetric shrinkage and cracks, resulting in flakes of silica.

This flake was scraped off with a Swedish steel scraper.

The obtained flakes were fired at 500°C to give a refractive index of 1.38,
Flake-like silica (flake-like silica (A)) having an average size of 25 μm and an average thickness of 1 μm was obtained.

Furthermore, by rotating the roll at a circumferential speed of 3.2 m/min, after firing at 500°C, flaky silica (flake silica (B )) was obtained.

A powder foundation was prepared using these flaky silicas.

For comparison, a powder foundation containing mica and talc was also prepared.

The results are shown in Table 3.

From this, it can be seen that products containing flaky silica having the physical properties of the present invention have better adhesion and elongation than products containing other materials.
It has excellent gloss.

Example 2, Comparative Example 3 200 g of 40% by weight ethanol solution of tetraethylorthosilicate and 200 g of aluminum isopropoxide
To a mixed solution of 50 g of wt% isopropanol solution, 32
After adding g of propionic acid and stirring and mixing at 70° C. for 3 hours, the washed slide glass was immersed in this solution.

After pulling this glass up at 50 cm/min, it was dried in an air bath at 90°C for 30 minutes, and then fired at 450°C for 30 minutes. A flaky silica-alumina was obtained.

This was further ultrasonically pulverized into water droplets, and the average size was reduced to 10
It was set as μ.

An oil-based foundation was prepared using this flaky silica-alumina.

For comparison, an oil-based foundation containing kaolin was also prepared.

The results are shown in Table 4.

Table 3 Table 4 Oil-Based Foundation After keeping the above product at 37°C for one month, Comparative Example 3 had a smell of fragrance and a rancid odor of oil and fat, but Example 2 had no change at all.

<Effects of the Invention> The synthetic flaky metal oxide of the present invention exhibits a moderate luster comparable to that of talc and sericite, a spreadability comparable to that of talc, mica, and sericite, and is easier to adhere to than talc, mica, and sericite. It has excellent properties and has better spreadability than kaolin and precipitated calcium carbonate.

Furthermore, it is chemically stable and does not easily deteriorate.

Cosmetics containing such synthetic flaky metal oxides satisfy adhesion, spreadability, and appropriate gloss at the same time, giving an unprecedented smooth and moist feel, and giving a natural beautiful finish due to the appropriate slight gloss.

Furthermore, depending on the type of cosmetic, the refractive index of the synthetic flaky metal oxide can be appropriately changed to easily change the glossiness and transparency.

Claims (1)

[Claims] The average thickness is 0.1 μm to 2 μm, the average size defined below is 1 μm to 100 μm, and the refractive index is 1.35 to 2 μm.
A makeup cosmetic containing a synthetic flaky metal oxide of 1.44. Here, the average size is (for 100 flakes)
It refers to the average value of the value of (longest cutting edge diameter + shortest cutting edge diameter)/2.