JPH0791174B2 - Makeup cosmetics - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to makeup cosmetics, and more specifically, makeup cosmetics containing a synthetic flaky metal oxide having a specific size and refractive index as a pigment. Regarding

Cosmetics are roughly divided into basic cosmetics and makeup cosmetics.

Among them, makeup cosmetics are intended to apply an appropriate coating and color to the skin, and specific examples thereof include foundations, pressed powders, lipsticks, eye shadows and the like.

<Prior art> Make-up cosmetics have a proper luster and transparency to cover the skin, improve spreadability (spreading) and adhesion (stickiness), and make up with secretions such as sweat and oil. Various bases are used to prevent collapse and to improve the feel during use, and to improve the moldability of products, and coloring agents are used to impart color.

As the base, various raw materials such as extender pigments such as talc, fats and oils, hydrocarbons or surfactants are used.

Various types of internal extender pigments are known, but these alone cannot satisfy the appropriate luster, spreadability and adhesiveness required as extender pigments.

For example, talc, mica, kaolin, sericite, etc. are known as natural layered clay minerals, but talc, mica, and sericite have poor adhesiveness, and kaolin and precipitated carbonic acid are used to improve the adhesiveness. Calcium and the like are used, but they have no malleability.

Therefore, these are combined foundations,
It is used in powdered white powder, solid white powder, lipstick, and blusher.

Further, these clay minerals contain oils and fats, which are cosmetic ingredients, due to impurities, hydroxyl groups, alkali metals and the like contained therein,
When coexisting with perfume and the like, there is a problem that the oils and fats are spoiled or the perfume is deteriorated. On the other hand, a method in which the clay mineral is dehydrated and then compounded (JP-A-57-169412) , A method of treating with polyamino acid (JP-A-57-145006)
However, since the impurities cannot be completely removed and the impurities (for example, iron oxide) should originally be white, they are colored yellowish brown. There is a drawback that.

Further, as a flaky pigment, a flake pigment having a thin layer of a high-refractive-index metal oxide on the surface of barium sulfate platelet crystals having a thickness of 0.05 to 1 μm (hereinafter abbreviated as μ) and a size of 5 to 100 μ is also proposed. (Japanese Patent Application Laid-Open No. 48-56833),
The process of depositing barium sulfate and then the metal oxide is long, and the thickness of the thin layer of the metal oxide thus obtained exhibits pearl luster in the range of 0.01 to 0.1 μ, which is too bright as an extender pigment. There are drawbacks such as.

Further, there is an attempt to pulverize mica titanium, which is originally used as a pearl pigment, to reduce luster and use it as an extender pigment, but it has a drawback that spreadability is not sufficient.

<Problems to be Solved by the Invention> The present inventors have incorporated conventional artificial cosmetics by incorporating artificially synthesized low-refractive-index flaky metal oxides as pigments, particularly extender pigments, into makeup cosmetics. It was found that an excellent feel during use and stability over time, which cannot be obtained by the above, can be obtained, and the present invention has been completed.

<Means for solving problems> Average thickness is 0.1μ to 2μ, average size is 1μ to 100μ
The makeup cosmetic composition is characterized by containing a synthetic flaky metal oxide having a refractive index of 1.35 to 1.44.

The present invention will be described in detail below.

Since flakes generally have a distribution, the size is the average size,
That is, the average value of the values of (the longest diameter of the thin piece + the shortest diameter of the thin piece + the shortest distance i) of 100 pieces is specified, and the thickness is also the average thickness, that is, the average value of 100 pieces. To do.

The synthetic flaky metal oxide of the present invention has a refractive index of 1.35 to 1.
44 items apply.

This is because the refractive index of oils that are usually used in cosmetics is 1.4 to 1.5.
Therefore, if it deviates significantly from this value, the transparency is impaired.

Examples of the metal oxide having such a refractive index include silica.

The refractive index of silica varies depending on the manufacturing method, crystal form, etc., and is 1.47 for tridymite, 1.48 for cristobalite, and 1.
It is about 55, but amorphous products synthesized at low temperatures below the melting point
It takes a value between 1.35 and 1.44.

This is probably because the texture of the low temperature synthetic 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.

For example, low temperature synthesized silica-alumina, silica-magnesia, silica-calcia, silica-calcia-sodium oxide and the like.

Further, the mixed oxide containing silica can also have its refractive index arbitrarily changed depending on its composition ratio.

For example, the refractive index of a mixed oxide of alumina / silica = 10/90 by weight is about 1.4.

The refractive index of natural substances such as mica, talc, kaolin, etc. is close to 1.5, but if synthetic flake metal oxide is used, the refractive index can be easily adjusted in the lower refractive index region as described above. Is possible.

The synthetic flaky metal oxide used in the present invention has an average thickness of 0.1 µ to 2 µ, an average size of 1 µ to 100 µ, exhibits appropriate gloss, and is not cloudy.

When the average thickness is less than 0.1 μ, the reflectance is high, the mechanical strength is lowered, and cracking is likely to occur.

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

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

However, if the average thickness exceeds 2μ, the adhesion to the skin is deteriorated and the usability is deteriorated.

It is preferably 2 μm or less, more preferably 1 μm or less.

When the average size is less than 1 μ, a suitable gloss is lost, and the adhesiveness is good, but the spreadability is completely lost and the transparency is lost.

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

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

Therefore, the average thickness is 0.1 to 2μ, and the average size is 1 to 70.
A flaky metal oxide having a thickness of μ is preferable, and an average thickness of 0.2 to 1
Further, a flaky metal oxide having an average size of 2 to 40 μ is more preferable.

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

For example, in the case of flaky alumina, a method in which high-purity aluminum is reacted with mercury in the presence of hydrochloric acid, and then hydrogen peroxide and alcohol are reacted (Japanese Patent Laid-Open No. 152999/1975),
Examples include a method of producing from acetic acid and a hot aqueous solution of aluminum sulfate (JP-A-54-24298), a method of producing from an acyloxy group-containing metal compound (Japanese Patent Application No. 59-31131), and the like. Examples thereof include a method of contacting calcium with a mineral acid (JP-A-54-118399).

Then, as a method for adjusting the flaky metal oxide having a specific size, the flaky metal oxide obtained by the above method is pulverized by a dry ball mill, a wet ball mill, a vibration mill, a roll mill, a Zet mill and / or the like. Vibrating sieves such as gyro shifters and hammer screens,
Wet classification methods such as spiral classifiers and hydraulic classifiers, dry classification methods such as dynamic or centrifugal wind classifiers, or methods of combining one or more classification steps such as flotation methods. And other methods known by the public (Powder Engineering Handbook, edited by Koichi Iitani, published by Asakura Shoten).

The mixing ratio of the flaky metal oxide thus obtained to the makeup cosmetic is the same as the mixing ratio of the conventional extender pigment, and also varies depending on the type of the cosmetic.

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

Specifically, for example, an oily foundation of 2% by weight to
60% by weight, 20% by weight to 90% by weight of pressed powder and pressed foundation.

In general, if the blending ratio is less than this, the effect of the present invention is not remarkable, and if it is more than this, almost only powder is obtained, and the moist feel or the like during use deteriorates.

The synthetic flaky metal oxides include colorants, for example, 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. The pigment may be coated with an organic dye such as No. 2 or Yellow No. 4 and an organic pigment such as aluminum lake, and used as a colored extender pigment.

As a method for blending these flaky metal oxides with a cosmetic, a known mixing method, that is, a Henschel mixer, a ribbon mixer, a V-type blender or the like can be used.

<Example> Hereinafter, the present invention will be described in more detail with reference to Examples.

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

Measurement of reflectance A pigment substance was added to a nitrocellulose lacquer so as to be 10% by weight to obtain the following test liquid.

Pigment substance 10 parts by weight Nitrocellulose RS1 / 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 monobutyl ether 3 parts by weight After sufficiently dispersing and mixing this, it was fixed on a surface plate. .

A black and white hiding power chart paper was developed with a doctor blade to a thickness of 75μ and solidified to form a film.

The film on the black portion of this chart paper was measured at an incident angle of 20 ° and a reflection angle of 20 ° according to the specular gloss measurement method of JIS-Z8741 to measure the surface gloss.

This surface glossiness was defined as the reflectance.

(5-30 for conventional extender pigments such as sericite and talc)
% Range. The reflectance of the flaky metal oxide of the present invention is shown in Table 1, and the reflectance of the conventional pigment substance is shown in Table 2.

The size and thickness of the paper were measured with a scanning electron microscope.

With respect to the cosmetics, a sensory test was conducted by 20 women on elongation, stickiness, smoothness, gloss and color feeling, and evaluation was made by a 5-step method with a maximum score of 5 points.

Example 1 and Comparative Examples 1-2 Silica gel (Ludox HS-40, manufactured by E.I.dupont)
Dilute with water to give a stock solution with a silica concentration of 15%.
It was

This was placed in a vat, a roll having a diameter of 10 cm was immersed in this solution at room temperature, and rotated at a peripheral speed of 2 m / min.

Next, on the roll with the undiluted solution, air at 120 ° C flow velocity 1m /
I shed like it was a second.

As a result, the water in the liquid film of the stock solution is removed, and a silica gel film is formed on the roll.

Further removal of water causes volume shrinkage and cracking, resulting in silica flakes.

The flakes were scraped with a Swedish steel scraper.

The obtained flakes were calcined at 500 ° C. to obtain flaky silica (flaky silica (A)) having a refractive index of 1.38, an average size of 25 μ, and an average thickness of 1 μ.

By rotating the roll at a peripheral speed of 3.2 m / min,
After firing at 00 ° C., flaky silica (flaky silica (B)) having a refractive index of 1.38, an average size of 40 μ, and an average thickness of 3.2 μ was obtained.

A powder foundation was prepared using these flaky silica.

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

The results are shown in Table 3.

From this, the one containing the flaky silica having the physical properties of the present invention has a stickiness, elongation,
Excellent gloss.

Example 2, Comparative Example 3 To a mixed solution of 200 g of a 40 wt% ethanol solution of tetraethylorthosilicate and 50 g of a 20 wt% isopropanol solution of aluminum isopropoxide, 32 g of propionic acid was added, and the mixture was stirred at 70 ° C. for 3 hours. After mixing, the washed slide glass was immersed in this solution.

After pulling this glass at 50 cm / min,
After drying at 0 ° C. for 30 minutes and baking at 450 ° C. for 30 minutes, transparent flaky silica-alumina having an average size of 30 μ, an average thickness of 1.0 μ and a refractive index of 1.44 was obtained.

This is further sonicated and elutriated to obtain an average size of 10μ.
And

An oily foundation was prepared using this flaky silica-alumina.

For comparison, an oily foundation containing kaolin was prepared.

The results are shown in Table 4.

After incubating the above product at 37 ° C. for 1 month, Comparative Example 3 felt the odor of the fragrance and the rancidity of the oil and fat, but Example 2 did not change at all.

<Effects of the Invention> The synthetic flaky metal oxide of the present invention exhibits an appropriate degree of luster similar to that of talc and sericite, and the same degree of spreadability as talc, mica, and sericite, and adheres to talc, mica, and sericite It has excellent properties and is more spreadable than kaolin and precipitated calcium carbonate.

Furthermore, it is chemically stable and hardly deteriorates.

The cosmetics containing such a synthetic flaky metal oxide simultaneously satisfy adhesiveness, spreadability, and appropriate luster to give a smooth and moist touch that has never been obtained, and to give a natural beautiful finish due to an appropriate luster.

In addition, depending on the type of cosmetic, it is possible to change the refractive index of the synthetic flaky metal oxide to an appropriate degree, and to easily change the glossiness and transparency.

Claims (1)

[Claims] 1. An average thickness of 0.1 μm to 2 μm, an average size defined below is 1 μm to 100 μm, and a refractive index of 1.3.
Makeup cosmetics made by mixing 5 to 1.44 of synthetic flaky metal oxide. Here, the average size refers to the average value of the values of (the longest length and the shortest diameter of the thin piece + the shortest length and the small diameter) / 2 of 100 thin pieces.