KR950001009B1 - Make-up cosmetics - Google Patents

Abstract

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Description

Makeup cosmetics

The present invention relates to a make-up cosmetics, and more particularly to a make-up cosmetics comprising a synthetic flake metal oxide having a specific size and refractive index as a pigment.

Cosmetics are roughly divided into basic cosmetics and makeup cosmetics.

Among them, makeup cosmetics are intended to impart a suitable coating and color to the skin, and specific examples thereof include powder foundation, oily foundation, solid powder, lipstick, eye shadow, and the like.

Makeup cosmetics cover skin with proper gloss and clarity, improve spreadability (whiteness of slipperiness) and adhesion, prevent makeup from being erased by sweat and sebum secretion, improve the feeling of use and products And various coloring matters to impart color to the skin and to enhance the moldability of the skin.

Examples of the base material include extender pigments such as talc, oils or various raw materials such as hydrocarbons and surfactants.

Various pigments known as extender pigments in the base material alone do not satisfy the appropriate gloss, spreadability and adhesion required as extender pigments.

For example, talc, mica, kaolin and sericite are known as natural layered clay minerals. However, talc, mica and sericite have low adhesion, and kaolin, precipitated calcium carbonate and the like used to improve adhesion have no spreadability. Therefore, they are combined and blended into foundations, powders, solid powders, lipsticks and rouges.

When the clay mineral coexists with fats and oils that are components of cosmetics, there is a problem that oils and fats are dissipated and flavors are changed by impurities, hydroxyl groups and alkali metals contained in clay minerals. Dehydration of clay minerals, compounding of dehydrated clay minerals (Japanese Patent Publication No. 169412/82), or treatment of clay minerals with polyamino acids (Japanese Patent Publication No. 145006/82) have been proposed but these It requires a complicated process and cannot completely remove impurities. In addition, clay minerals, which must be white, are yellowish brown due to these impurities (eg zinc oxide).

A flaky pigment having a thickness of 0.05 to 1 mu m (hereinafter abbreviated as mu) and a thin layer of metal oxide having a high refractive index on the surface of platelet crystals of barium sulfate having a size of 5 to 100 mu has been proposed. Patent Publication No. 56833/73].

However, such pigments have a long process of depositing barium sulfate, followed by precipitation of metal oxides, and are used as extender pigments because of the pearly luster represented by the thin layer having a thickness within the range of 0.01 to 0.1 mu. It is flawed in that it shines too much.

In addition, there have been attempts to reduce gloss by pulverizing Undo-Titania, which is commonly used as a pearl pigment, and using it as a sieving pigment, but has the disadvantage of insufficient spreadability.

The present inventors can use artificially synthesized flaky metal oxide having a low refractive index as a pigment, in particular, a sieving pigment, and by blending it into a makeup cosmetic, it gives a feeling of use and time-lapse stability not known in cosmetics. It has been found that the present invention has been completed.

The present invention relates to a makeup cosmetic comprising a synthetic flaky metal oxide having an average thickness of about 0.1 to about 2 microns, an average size of about 1 to about 100 microns and a refractive index of about 1.4 to about 1.8.

The present invention has been described in detail below.

Flakes are very wide in size and thickness, the size of which is defined as the average size, i.e., the average value of the 100 flakes (diameter of the longest flakes + diameter of the shortest flakes) / 2. The thickness is also defined as the average thickness, ie the average thickness for 100 flakes.

The synthetic flake metal oxide used in the present invention has a refractive index of about 1.4 to about 1.8. This is because the refractive index of the oil commonly used in cosmetics is about 1.5 to about 1.6, and if it deviates too much from the above range, the transparency is reduced.

Examples of the metal oxide having the above refractive index include alumina (refractive index: 1.76), silica (1.40 to 1.55), magnesia (1.74), and the like.

The mixed oxide containing such a metal oxide may vary in refractive index according to the component ratio.

For example, the refractive index of the mixed oxide of alumina and silica is about 1.7 when the weight ratio of alumina to silica is 90/10, and about 1.65 when 80/20. Other metal oxides of high refractive index, for example titania, zirconia or zinc oxide, can also be used depending on the ratio. For example, the refractive index of a mixed oxide of titania and silica is about 1.8 when the weight ratio of titania to silica is 50/50 and about 1.6 when the weight ratio is 25/75.

If moderate glossiness is desired, high refractive indices of about 1.6 to about 1.8 can be used. Low refractive index can be used to emphasize transparency.

Natural products such as mica, talc and kaolin have a narrow refractive index close to 1.5, but the refractive index can be easily adjusted as described above using the above-described synthetic flake metal oxide.

The synthetic flake metal oxide used in the present invention has an average thickness of about 0.1 to about 2 mu and an average size of about 1 to about 100 mu, and has an appropriate gloss without turbidity.

If the average thickness is less than about 0.1 mu, the refractive index is increased, and the mechanical strength is reduced to break easily. The average thickness is at least about 0.1 micron, preferably at least about 0.2 micron.

If the average thickness is about 0.1 mu or more, the metallic luster rapidly decreases, and at an average thickness of about 0.2 mu or more, the metallic luster becomes small to a very low value.

However, when an average thickness is about 2 micrometers or more, adhesiveness to skin becomes low and a feeling of use falls.

The average thickness is about 2 mu or less, preferably about 1 mu or less.

If the average size is 1 mu or more, proper gloss is lost, and despite good adhesion, the spreadability is completely lost, resulting in no transparency at all.

Spreadability is improved by increasing the average size.

However, when the average size is about 100 mu or more, the purpose of uniformly covering the skin is not achieved, but easily separated. Therefore, the average size is preferably about 100 µm or less, more preferably about 40 µm or less.

Thus, the flaky metal oxide preferably has an average thickness of about 0.1 to about 2 microns and an average size of about 1 to about 70 microns, more preferably an average thickness of about 0.2 to about 1 microns and an average of about 2 to about 40 microns. Has a size.

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

For example, a method for producing flaky alumina is a method of producing by reacting high purity alumina with mercury in the presence of hydrochloric acid, and reacting the resulting product with hydrogen peroxide and alcohol [Japanese Patent Laid-Open No. 152999/75] or And a method for producing from acetic acid and a hot aqueous solution of aluminum sulfate [Japanese Patent Laid-Open No. 24298/79] or a method for producing from an acyloxy group-containing metal compound [Japanese Patent Application No. 31131/84]. As a method of manufacturing flaky silica, the method of contacting calcium silicate with a mine can be illustrated (Japanese Patent Laid-Open No. 118399/79).

As a method for producing a flaky metal oxide having a specific size, the flaky metal oxide obtained by the above-described method is used as a dry ball mill, a wet ball mill, a vibration mill, a roll mill and a jet ( pulverization in a jet mill, and / or assortment stages by vibrating screens, gyro sifters or hammer screens, wet sorting, spiral or centrifugal wind classifiers, such as spiral classifiers or hydraulic classifiers, etc. Well-known methods, such as mixing | blending, such as a dry classification method or a flotation method, can be illustrated (Powder Engineering Handbook, edited by Kaichi Inoya. Published by Asakura Publishing Co., Ltd.).

When the resulting flaky metal oxide is formulated in a makeup cosmetic, the ratio is the same as in the case of known extender pigments, and depends on the type of cosmetic.

Flaky metal oxides can of course be used in combination with known sieving pigments and pearlescent pigments.

Specifically, for example, the blending fraction is about 2% to about 60% by weight for oily foundations and about 20% to about 90% by weight for solids and solid foundations.

In general, when the blending fraction is lower than the above-mentioned range, the effects of the present invention are not remarkably shown. When the blending fraction is larger than the above-mentioned range, the texture at the time of use decreases, for example, most powders of the makeup cosmetics are inferior in moist feeling.

In addition, a synthetic flaky metal oxide may be used as a colorant, for example, colored metal oxides such as iron oxide, chromium oxide, or cobalt oxide; Metal complex salts such as zinc cyanide; Colored metal hydroxides such as iron hydroxide; It can be used as a color pigment by coating with organic dyes such as red dye No. 2 or yellow No. 4 and organic pigments such as aluminum lake of organic dyes.

Such a flaky metal oxide can be mix | blended with cosmetics by a well-known mixing method, ie, the method using Henschel mixer, ribbon mixer, V-type blender, etc.

EXAMPLE

The invention is illustrated in more detail by the following examples; The light reflectance value (larger value means that the gloss is closer to metallic gloss) was measured by the following method.

Reflectance Measurement

A pigment material was blended into the nitrocellulose lacquer so that the fraction was 10% by weight, and the following test solution was prepared.

10 parts by weight of pigment

Nitrocellulose RS 1/4 16 parts by weight

Isopropyl alcohol 7 parts by weight

Isoamyl Acetate 35 parts by weight

29 parts by weight of n-butyl acetate

3 parts by weight of diethylene glycol monobutyl ether

The resulting liquid was sufficiently dispersed mixed and fixed on the surface plate. Using the doctor blade, the liquid was applied to a layer having a thickness of 75 mu on a black and white hiding chart and solidified to form a film.

The surface gloss of the film of the black part on chart paper was measured and determined by the incidence angle 20 degrees and the reflection angle 20 degrees according to the specular gloss measurement method of JIS-Z8741.

Surface gloss was used as the reflectance (the reflectances of sericite and talc, which are ordinary extender pigments, are in the range of 5 to 30%).

The reflectance of the flaky metal oxide of the present invention is shown in Table 1, and the reflectance of the known pigment material is shown in Table 2. The size and thickness of the particles were measured with a scanning electron microscope.

Twenty women were subjected to a sensory test for the spread, adhesion, smoothness, gloss, and color of the cosmetics, and were evaluated by a five-step method with a peak of five.

TABLE 1

TABLE 2 (reflectance of pigment)

[Example 1], [Comparative Examples 1 and 2]

To a 40% by weight solution of tetraethyl orthosilicate dissolved in ethanol, 2 times molar formic acid of Si in this solution was added. 100 μl under the former condition by stirring and mixing at 70 ° C. for 3 hours, immersing the washed slide glass pieces therein, pulling them at a speed of 75 cm / min and 200 cm / min, and then 30 minutes at 90 ° C. in an air bed. A smooth surface transparent flake having an average size of and an average thickness of 1.7 μm was obtained, and a smooth surface transparent flake having an average size of 105 μm and an average thickness of 3.5 μ was obtained under the latter conditions. The flaking rate was 100%.

The resulting flakes were calcined at 450 ° C. for 30 minutes to obtain transparent flake silica having a refractive index of 1.48, an average size of 60 μ and an average thickness of 0.9 μ under the former conditions, an average size of 62 μ and a 2.8 under the latter conditions. Clear flake silica with an average thickness of μ was obtained. The above-mentioned transparent flaky silica was ultrasonically pulverized to obtain flaky silica [flaky silica (A)] having an average size of 35 μ and an average thickness of 0.9 μ and flaky silica having an average thickness of 37 μ and an average thickness of 2.8 μ [ Flaky silica (B)] was obtained.

Flaky silica is used in the production of powder foundations. For comparison, powdered foundations with talc were prepared. The results obtained are shown in Table 3.

As can be seen from Table 3, the combination of flaky silica has better secondaryness, spreadability and gloss than that of talc.

[Example 2], [Comparative Examples 3 and 4]

200 ml of a 1N AgCl ₃ solution was placed in a glass beaker, and the solution was combined by a magnetic stirrer. 170 ml of 1N NaOH solution was added to the stirred solution at a rate of 3 ml / min using a micro tube pump.

After the addition was complete, the mixture was further stirred for 30 minutes to give a white gel of pH 7.1.

The resulting gel was centrifuged at 1000 rpm for 10 minutes to discard the supernatant. Distilled water was added to the resulting precipitate so that the total volume was 200 ml. After sufficient stirring, the mixture was centrifuged to discard the supernatant, and the same operation was repeated two more times.

Distilled water was added to the produced precipitate to make a total volume of 200 ml. The mixture was aged at room temperature for 1 week, then centrifuged at 5000 rpm for 5 minutes to discard the supernatant, and the precipitate was washed with ethanol and dried in vacuo to yield 1.57 g of white powder.

The above-mentioned powder was heated in a vapor convection at 300 ° C. for 8 hours and then calcined at 1000 ° C. for 1 hour to obtain flaky alumina having a size of 1.5 to 200 μ, a thickness of 0.05 to 2 μ, and a refractive index of 1.7. Only flakes having a size in the range of 10-50 μ were sorted out in a zigzag classifier. The obtained flakes had a thickness of 0.05-0.5 탆 and were named flake alumina A.

The flakes having a size in the range of 100-200 mu were further sorted. Their thickness is 1 to 2 mu and is called flake alumina B.

Flaky alumina A and B were used for the preparation of oily foundations.

For comparison, an oily formulation with kaolin was prepared. The obtained results are shown in Table 4.

Example 3 and Comparative Example 5

43 g of pyrionic acid was added to a mixture of 100 g of a 40 wt% solution of tetraethyl orthosilicate dissolved in ethanol and 200 g of a 40 wt% solution of aluminum isopropoxide dissolved in isopropanol. The resulting solution was mixed for 3 hours at 70 ° C. under stirring, the washed slide glass pieces were immersed, drawn at a speed of 50 cm / min, stirred at 90 ° C. for 30 minutes in an air bed and calcined at 450 ° C. for 30 minutes. Thereby obtaining a transparent flake silica-alumina having an average size of 30, an average thickness of 0.5 and a refractive index of 1.57, which was sonicated and sown to have an average size of 10.

The resulting flake silica-alumina is used to prepare the powder.

For comparison, white powder was prepared using talc. The obtained results are shown in Table 5.

Table 3 (percent foundation)

Table 4 Oily Foundation

When the product was kept at 37 ° C. for 1 month, Comparative Example 4 had a changed smell of perfume and rancid smell of fats and oils, but there was no change in Example 2.

The product of Comparative Example 3 was excellent in color and gloss but poor in spreading and adhesion.

Table 5 (percent)

The synthetic flaky metal oxides of the present invention have a suitable gloss comparable to talc and sericite, a spreadability comparable to talc, mica and sericite, better adhesion than talc, undo and sericite and more than kaolin and precipitated calcium carbonate. It has good spreadability and is also chemically stable and not easily changed.

Cosmetics formulated with these synthetic flake metal oxides simultaneously satisfy the adhesion, spreadability and appropriate gloss, gives a smooth and moist texture that has not been seen before, and gives a natural gloss with an appropriate slight gloss.

It is possible to change the glossiness and transparency easily by appropriately changing the reflectance of the synthetic flaky metal oxide according to the kind of cosmetics.

Claims (1)

An average thickness of about 0.1 to about 2 μm, with an average value of about 1 to about 100 μm and a refractive index of about 1.4 to about 100 flakes (the longest diameter of the flakes + the shortest diameter of the flakes) / 2 A makeup cosmetic comprising a combination of 1.8 synthetic flake metal oxides.