JPH07103007B2 - Cosmetics - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cosmetic composition, and more particularly to a finish cosmetic composition containing flaky titanium oxide as a pigment.

[0002]

2. Description of the Related Art Cosmetics are roughly classified into basic cosmetics and finish cosmetics. Of these, finishing cosmetics are intended to apply a proper coating and color to the skin, and specific examples thereof include foundations, pressed powders, lipsticks, eye shadows and the like.

Finishing cosmetics cover the skin with appropriate luster and transparency, and are spreadable (spread) and adhesive (sticky).
Various bases to improve cosmetics, prevent makeup breakdown due to secretions such as sweat and oil, improve the feel during use, and improve the moldability of products, and coloring to add color Fees are used.

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

Of these, various extender pigments are known, but these alone cannot satisfy the appropriate luster, spreadability and adhesiveness required as extender pigments. For example, natural layered clay minerals include talc, mica,
Kaolin, sericite, etc. are known, but talc, mica, and sericite have poor adhesion, and kaolin, precipitated calcium carbonate, etc. are used to improve adhesion, but they have no spreadability at all. . Therefore, they are combined to form foundation, white powder, solid white powder, lipstick,
It is mixed in blusher and so on.

Further, due to impurities, hydroxyl groups, alkali metals and the like contained in these clay minerals, when coexisting with oils and fats and perfumes which are cosmetic ingredients, the oils and fats are rancid or the perfumes are altered. In contrast to this, there is a problem in that the clay mineral is dehydrated and then compounded (Japanese Patent Laid-Open No. Sho 57-57).
-169412) and a method of treating with a polyamino acid (JP-A-57-145006) have been proposed, but complicated steps are required, and the impurities cannot be completely removed. Iron oxide), which should originally be white, has the drawback of being colored tan. Furthermore, since clay minerals have a low refractive index, they also have the drawback that they turn blackish when wet with sweat or rain.

The flaky pigment has a thickness of 0.05 to
A flake pigment having a thin layer of a high-refractive-index metal oxide on the surface of a barium sulfate platelet crystal having a size of 1 μm (hereinafter abbreviated as μ) and a size of 5 to 100 μ has also been proposed (Japanese Patent Laid-Open Publication No. 4 (1999) -43,091).
No. 8-56833), a step of precipitating barium sulfate and then a metal oxide is long, and the thickness of the thin layer of the metal oxide thus obtained is 0.01 to 0.1 μm. Since it shows luster, it has a drawback that it is too bright as an extender pigment.

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

On the other hand, as the colorant, a coloring pigment, an inorganic pigment such as iron oxide, a tar dye such as red No. 226, or a pearl pigment exhibiting a pearlescent to metallic luster such as titanium mica is used.

Of these, the pearl pigment has a thin piece thickness of 0.01 to 0.1 as an optical condition for developing pearl luster.
Must be in the μ range. (Japanese Patent Publication Sho 35-1557
The size of the mica titanium is 5 to 100 μm in order to reduce the scattering of light at the edges in order to obtain an optical effect.

Examples of such pearl pigments include crystals of guanine, basic lead carbonate, bismuth oxychloride and the like, and mica titanium in which mica is coated with titanium oxide. They are used in lipsticks, eye shadows, nail enamel, etc., which have a unique effect with brilliance. Guanine has the drawback that it is expensive and its supply is limited because it is collected from a special type of fish body, and crystals of basic lead carbonate, bismuth oxychloride, etc. are preferable for cosmetic use because of the toxicity of lead and bismuth. However, titanium mica has a problem that it becomes chemically unstable due to impurities contained in the raw material mica and is colored, and its adhesion is still insufficient.

[0012]

By changing the thickness and size of flaky titanium oxide, the inventors of the present invention do not have the above-mentioned problems (expensive, safety, chemical stability, etc.) and can be used as pearl pigments. It has been found that the finishing cosmetics that can be used and that use such flaky titanium oxide as a pigment can provide excellent feeling during use and stability over time, which cannot be obtained by conventional cosmetics.

[0013]

That is, according to the present invention, the average thickness is 0.01 to less than 0.1 µ, and the average size is 5 µ to 100 µ.
It is another object of the present invention to provide a finishing cosmetic characterized by containing flaky titanium oxide having a particle size of μ as a pigment.

The present invention will be described in detail below. Since flakes generally have a distribution, the size is defined as the average size, that is, the average value of the values of (the longest length of the flakes + the shortest length of the flakes) / 2 for 100 flakes, and the thickness. Average thickness,
That is, it is defined by the average value of 100 thin pieces.

In the present invention, the flaky titanium oxide used as a pearl pigment has an average thickness of 0.01 to less than 0.1 μ and an average size of 5 to 100 μ, and has a high reflectance,
That is, it exhibits high gloss, has good adhesiveness, does not contain impurities like mica, is pure white, has no turbidity, and is chemically stable.
(Hereinafter, such flaky titanium oxide is referred to as high-gloss flaky titanium oxide.)

The cosmetic containing the flaky titanium oxide is excellent in spreadability and adhesiveness, has a clear color effect, and does not cause decomposition of the organic compound contained at the same time.

When the average thickness is less than 0.01 μ, the mechanical strength is poor, and when it is 0.1 μ or more, the reflectance is not sufficient. If the average size is less than 5μ, the gloss is reduced, and if it is more than 100μ, the cosmetic effects such as adhesion are deteriorated.

The flaky titanium oxide used in the present invention is
It can be manufactured by various methods. For example, a method in which an organic solvent solution of titanium alkoxide is applied to a smooth surface, and a film formed by the action of water vapor is cracked to obtain flakes (US Pat. No. 2,941,895), a titanium tetrachloride solution is applied to a gelatin film, and then a gelatin film is applied. Method of dissolution (Japanese Patent Publication Sho 30-473)
Japanese Laid-Open Patent Publication No. 39-252).
No. 80), a method of treating potassium titanate fibers with an acid and then with heat (JP-A-58-88121), etc. to obtain flaky titanium oxide having a desired thickness.

As a method for preparing the flaky titanium oxide having a specific size, the flaky titanium oxide obtained by the above-mentioned method is dry ball mill, wet ball mill,
Grinding with a vibration mill, roll mill, Zet mill, and / or
Or 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 flotation methods Well-known methods such as a method of combining one or two or more of the classification steps can be mentioned (Powder Engineering Handbook (edited by Koichi Iitani, published by Asakura Shoten).

The blending ratio of the flaky titanium oxide thus obtained to the finishing cosmetic is the same as that of the conventional pearl pigment. Of course, conventional extender pigments and pearl pigments may be used in combination, and low-gloss flaky titanium oxide may be used in combination.

When used as a pearl pigment, that is, high-gloss flaky titanium oxide is, for example, 0.1% by weight to 1% by weight of nail enamel, 0.1% by weight to 10% by weight of lipstick, and 2% by weight of eye shadow. % To 80% by weight. Generally, if the blending ratio is less than this, the effect of the present invention is not remarkable, and if it is more than this, the proportions of fats and oils, colorants, etc. are too small, and the feel during use and the color effect are reduced.

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

[0023]

According to the present invention described in detail above, the flaky titanium oxide exhibits high gloss, has good adhesiveness, does not contain impurities such as mica, is pure white, and is chemically stable without turbidity. Therefore, cosmetics containing such flaky titanium oxide have excellent advantages such as excellent spreadability and adhesiveness, a clear color effect, and no decomposition of organic compounds mixed at the same time.

[0024]

EXAMPLES The present invention will be described in more detail below with reference to examples. The light reflectance value (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 platen. . A black and white hiding power chart paper was developed with a doctor blade to a thickness of 75 μ and solidified to form a film. The film on the black portion of the 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. (Conventional pearl pigments are available in various grades, but the lower one is 40% and the higher one is 60%.) The reflectance of the flaky titanium oxide of the present invention is shown in Table 1, and the reflectance of the conventional pigment substance is shown. It shows in Table 2. (The particle size and thickness were measured by a scanning electron microscope.)

Example 1, Comparative Example 1 Table 1 Sample No. A powder eye shadow was prepared using 2 of the high gloss flaky titanium oxide. For comparison, a powder eye shadow containing titanium mica (MP47) was also prepared. A sensory test was conducted by 20 females on elongation, brightness, and color appearance, and evaluation was made by the average score of the results evaluated by a 5-step method with a maximum score of 5. The results are shown in Table 3.
Shown in. It can be seen that the one using the high-gloss flaky titanium oxide has the same elongation as that of the one containing the conventional titanium mica, but is excellent in terms of color and touch.

Example 2, Comparative Example 2 Table 1 Sample No. Nail enamel was prepared using 2 high gloss flaky titanium oxide. For comparison, a nail enamel containing titanium mica (MP47) was also prepared. The results are shown in Table 4. It can be seen that the one using the high-gloss flaky titanium oxide is superior in tint and color feeling as compared with the one containing the conventional titanium mica.

[0028]

[Table 1]

[0029]

[Table 2]

[0030]

[Table 3]

[0031]

[Table 4]

Claims (1)

[Claims] 1. A finish cosmetic comprising a flaky titanium oxide having an average thickness of 0.01 to less than 0.1 μ and an average size of 5 to 100 μ as a pigment.