JPS61293906A - Finishing cosmetic - Google Patents

Abstract

PURPOSE:A finishing cosmetic having well balanced properties such as spreading properties, adhesivity and proper luster, slightly causing change in color, having chemical stability and providing slightly change in quality, obtained by blending a cosmetic with fine powder titanium oxide coated titanium oxide in a thin pieces state. CONSTITUTION:A cosmetic is blended with titanium oxide in a thin piece state, whose surface is coated with fine powder titanium oxide (preferably 0.005-0.1mum diameter). Titanium oxide having an average value shown by the formula of (maximum diameter+minimum diameter)/2 of 0.8-70mum and 0.2-20mum thickness is used as the titanium oxide in a thin piece state and a weight ratio of the fine powder titanium oxide to the titanium oxide in a thin piece state is prefer ably 0.01-2, especially 0.05-0.5. When the titanium oxide is used as extender pigment, the amount of the titanium oxide in a thin piece state, having low luster, is 2-60wt% in the case of an oily foundation and 20-90wt% in the case of pressed powder or pressed foundation.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a finished cosmetic, and more particularly to a finished cosmetic containing flaky titanium oxide whose surface is coated with finely divided titanium oxide as a pigment.

Cosmetics are broadly divided into basic cosmetics and finishing cosmetics.

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

Finishing cosmetics cover the skin with appropriate gloss and transparency, and have good spreadability and adhesion.
Various bases are used to prevent make-up from fading due to secretions such as sweat and oil, to improve the texture during use, and to improve the moldability of products, and coloring agents are used to add color. Various raw materials such as extender pigments such as talc, fats and oils, hydrocarbons, and surfactants are used as bases.

Various types of extender pigments are known, but these alone do not provide the necessary luster or luster as an extender pigment.
For example, talc, mica, kaolin, sericite, etc. are known as natural layered clay minerals that do not meet the requirements of spreadability and adhesion.However, talc, mica, and sericite have poor adhesion and Kaolin, precipitated calcium carbonate, etc. are used to improve the properties, but these have no spreadability. Therefore, these are combined and formulated into foundations, whitening powders, solid whitening powders, lipsticks, blushers, and the like.

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
No. 7-145006 II) has been proposed, but it requires a complicated process and impurities cannot be completely removed.
This impurity (for example, iron oxide) has the disadvantage that what should originally be white becomes yellowish brown in color.

Furthermore, because clay minerals have a low refractive index, they also have the disadvantage of turning dark (discolored) when wet with sweat or rain.

In addition, as a flaky pigment, a thickness of 0.05 to 1 μl (
A flake-like pigment having a thin layer of a high refractive index metal oxide on the surface of barium sulfate platelet crystals with a size of 5 to 100 μ has also been proposed (JP-A-48-56
No. 833), the process of depositing barium sulfate and then depositing the metal oxide is long, and the thickness of the thin layer of the metal oxide obtained in this way is 0.01 to 0. Since it exhibits pearlescent luster in the 1μ range, it has the disadvantage 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.

On the other hand, colorants include colored pigments, inorganic pigments such as iron oxide,
Tar pigments such as Red No. 226, pearl pigments exhibiting pearlescent to metallic luster such as mica titanium, white pigments, etc. are used.

Among these, the pearl pigment must have a flake thickness in the range of 0.01 to 0.1 μm as an optical condition for developing pearlescent luster. (Japanese Patent Publication No. 35-15579) Also, in order to reduce the scattering of light in green in order to obtain optical effects, a certain size is required, and in the case of mica titanium, it is 5 to 100μ. .

Such pearl pigments include guanine, basic lead carbonate,
Powders of titanium oxide, zinc oxide, etc. are used as white pigments that include crystals such as bismuth oxychloride, titanium mica, etc. coated with titanium oxide on mica.

These are excellent in that they have a high refractive index, scatter light well, and have good adhesion, but are not sufficient because they have poor spreadability on the skin and poor gloss.

The present inventors have found that it has well-balanced properties such as spreadability, adhesion, and maintains appropriate gloss, and is resistant to discoloration.
, we have repeatedly studied new finishing cosmetics that are chemically stable and resistant to deterioration, and by incorporating flaky titanium oxide coated with fine particles of titanium oxide, we have created an excellent feel and stability that cannot be obtained with conventional pigment formulations. The present inventors have discovered that a finished cosmetic material with a certain level of properties can be obtained, and have thus arrived at the present invention.

That is, the present invention is a cosmetic containing flaky titanium oxide coated with fine particles of titanium oxide.

The present invention will be explained in detail below.

It is defined by the average value of the value of (longest across diameter + shortest across diameter)/2, and the thickness is also defined as the average thickness, that is, the average value for 1°0 slices.

The flaky titanium oxide used in the present invention can be used in any size, but preferably has an average thickness of 0.2μ to 2μ,
The average size is 0.8-70μ.

If the thickness is less than 0.2μ, a decrease in mechanical strength occurs.

On the other hand, if the thickness exceeds 2 μm, adhesion to the skin will be reduced and the feeling of use will be reduced.

Preferably it is 1μ or less.

If the average size is smaller than 0.8μ, the pigment becomes a pure white pigment, loses its appropriate gloss, has good adhesion, but has no spreadability, and lacks transparency.

The larger the average size, the better the spreadability, but if the average size exceeds 70μ, the particles tend to separate and the purpose of uniformly covering the skin cannot be achieved. Therefore, the average size is preferably 70μ or less, more preferably 40μ or less.

Therefore, the average thickness is 0.2 to 2μ, and the average size is 0.2μ.
Flaky titanium oxide having a diameter of 8 to 70 microns is preferred, and flaky titanium oxide having an average thickness of 0.2 to 1 micron and an average size of 2 to 40 microns is more preferred.

The fine titanium oxide particles coated on the surface may be of any size, but preferably have a diameter of 0° and 1 μm or less.

Fine titanium oxide particles with a diameter smaller than o or oosμ are substantially difficult to manufacture, and also difficult to distinguish as particles.

On the other hand, if O is larger than 1μ, the thickness will be about the same as the flaky titanium oxide base, the surface will become whitish and uneven, and the gloss and tactility will deteriorate.

The ratio of fine titanium oxide to flaky titanium oxide is in the range of 1/100 to 200/100, preferably 5
A range of /100 to 50/100 is preferable. The ratio is 1/10
If it is less than 0, the effects of improving adhesion and lowering gloss due to coating with fine titanium oxide will not appear, and preferably 5/100.
The above is effective. Moreover, if the ratio exceeds 200/100, it becomes powdery, not much different from conventional titanium oxide, and has poor spreadability.

This ratio is preferably 50/100 or less.The flaky titanium oxide whose surface is coated with such fine particles of titanium oxide has a moderate luster comparable to that of talc or sericite, and has the same level of extensibility as talc, mica, or sericite. It exhibits ductility and has better adhesion than talc, mica, and sericite, and better spreadability than kaolin, precipitated calcium carbonate, and conventional powdered titanium oxide. Furthermore, it is chemically stable and does not easily change in quality, and has a high refractive index and does not change color even when wet with water.

Cosmetics containing such fine-grained titanium oxide coated flaky titanium oxide 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. .

In addition, flaky titanium oxide alone has excellent spreadability, adhesion, and gloss compared to conventional extender pigments, etc., but the flaky titanium oxide coated with fine titanium oxide according to the present invention is effective in controlling the shape of the fine titanium oxide and coating amount. This has the advantage that spreadability and adhesion can be delicately controlled.

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

For example, after applying a solution of titanium alkoxide in an organic solvent to a smooth surface, the resulting film is cracked by the action of water vapor.
A method of obtaining flakes (US Pat. No. 2,941,895), a method of dissolving the gelatin film after applying a titanium tetrachloride solution to the gelatin film (Japanese Patent Publication No. 30-473), a method using vacuum deposition (Japanese Patent Publication No. 39-25280) (Japanese Unexamined Patent Publication No. 1987), a method of treating potassium titanate fibers with acid and then heat
-88121 Publication@) etc., flaky titanium oxide having a desired thickness can be obtained.

As a method for preparing flaky titanium oxide of a specific size, the flaky titanium oxide obtained by the above method is pulverized using a dry ball mill, a wet ball mill, a vibration mill, a roll mill, a jet mill, etc., and/or a gyro sifter. or a vibrating screen such as a hammer screen,
Wet classification methods such as spiral classifiers or hydraulic classifiers, dry classification methods such as dynamic or centrifugal wind classifiers, or combinations of one or more classification processes such as flotation methods, etc. Commonly known methods such as ('FA
Handbook of Body Engineering, edited by Kou Iitani, published by Asakura Shoten).

In addition, as a method for coating flaky titanium oxide with fine particles of titanium oxide, the flaky titanium oxide is dispersed in a sulfuric acid acidic titanyl sulfate solution, and then rapidly heated to 90 to 100°C to cause hydrolysis. , a known method of depositing and coating titanium hydroxide on flaky titanium oxide (US Pat. No. 30)
87828, etc.), a method of depositing and coating by a homogeneous precipitation method in which a substance that decomposes and generates a base, such as urea, is added when heated (Japanese Patent Publication No. 39-28885), or a method of using titanium tetrachloride as a titanium source. There are various methods such as
A method suitable for the purpose, reaction conditions, etc. may be selected.

The blending ratio of the flaky titanium oxide thus obtained in the finished cosmetic is the same as the blending ratio of conventional white pigments and extender pigments. It varies depending on the purpose of use, ie, white pigment or extender pigment. It also varies depending on the type of cosmetic.

Of course, it may be used in combination with conventional extender pigments and coloring pigments, and furthermore, in combination with flaky titanium oxide.

When used as an extender pigment, ie, low-gloss flaky titanium oxide, the content is, for example, 2% to 60% by weight in oil-based foundations, and 20% to 90% by weight in pressed powders and pressed foundations.

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, the composition will consist almost entirely of powder, and the feel during use, such as a moist sensation, will deteriorate.

In addition, this flaky titanium oxide coated with fine particles of titanium oxide may be mixed with colorants such as colored metal oxides such as iron oxide, chromium oxide, and cobalt oxide, metal complex salts such as iron cyanide, and colored metal hydroxides such as iron hydroxide. , Red No. 2, Yellow No. 4, and other pigments such as aluminum lake, etc., and then used as a colored extender pigment.

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

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

Incidentally, the light reflectance value (the thicker the value, the closer it is to metallic luster).

) was measured by the following method.

Measurement of Reflectance A pigment material was added to nitrocellulose lacquer in an amount 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 Diethylene glycol monobutyl ether 3 parts by weight These were sufficiently dispersed and mixed and then fixed on a surface plate. A film was formed by spreading it out to a thickness of 75 μm using a doctor blade on black and white hiding power chart paper and solidifying it.

The film part on the black part of this chart paper is JIS-2
The surface gloss was measured according to the specular gloss measurement method of 8741 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
There are various grades of pearl pigments, with the lowest being 40% and the highest being 60%. ) The reflectance of the flaky titanium oxide coated with fine particles of titanium oxide of the present invention is shown in Table 1, and the reflectance of conventional pigment materials is shown in Table 2. (The size and thickness of the particles were measured using a scanning electron microscope.) Example 1, Comparative Examples 1 to 4 Titanyl sulfate was added to 10 parts of flaky titanium oxide with an average size of 4μ and an average thickness of 0.3μ. A water slurry prepared by adding 3.1 parts of titanyl sulfate and 100 parts of water and then adding sulfuric acid to make the pH 1 was rapidly heated to 100°C to hydrolyze the titanyl sulfate. After precipitating titanium oxide, solid-liquid separation was performed and then fired to obtain a flaky titanium oxide coated with fine particles of titanium oxide (hereinafter simply referred to as coated titanium oxide). The weight ratio of fine titanium oxide to flaky titanium oxide was about 1:10.

Further, observation using a scanning electron microscope showed that the average diameter of the fine titanium oxide particles was about 0.05 μm.

Using this coated titanium oxide, a powder foundation having the composition shown in Table 3 was prepared.

Comparative Example 1 contains talc instead of coated titanium oxide, Comparative Example 2 contains kaolin, Comparative Example 3 contains synthetic polymer powder, and Comparative Example 3 contains mica titanium. This is shown in Example 4.

A powder foundation having the composition shown in Table 3 was prepared using this low-gloss flaky titanium oxide.
A sensory test was conducted by 20 women regarding the adhesion, smoothness, gloss, and color feel, and the average score of the results was evaluated using a 5-point scale with the highest score being 5 points. The results are shown in Table 3.

As a result, powder foundations containing flaky titanium oxide coated with fine particles of titanium oxide are superior in adhesion and smoothness compared to those containing talc, and are superior in spreadability and gloss compared to those containing kaolin.
It can be seen that it is superior in smoothness when compared to synthetic polymer powder formulations, and superior in gloss when compared to mica titanium formulations.

Example 2, Comparative Example 5 Fine titanium oxide particles with an average diameter of 0.05 μm were added to the surface of flaky titanium oxide particles with an average size of 10 μm and a thickness of 0.5 μm in the same manner as in Example 1 in a weight ratio of fine titanium oxide/particle titanium oxide/ Flaky titanium oxide = 30/1. It was coated to give Qo. (Coated titanium oxide B) Using this coated titanium oxide B, an oil-based foundation having the composition shown in Table 3 was prepared.

Instead of coated titanium oxide B, ordinary titanium oxide 7 (A-
100, manufactured by Ishihara Sangyo Co., Ltd.) is shown in Comparative Example 5.

÷ The results are shown in the table below.

Example 3, Comparative Example 6 Particulate coated flakes with a weight ratio of fine titanium oxide (average diameter 0.02μ)/one flake titanium oxide (average size 4μ, average thickness 0.3μ) of 5/100. Titanium oxide (coated titanium oxide C) was prepared.

Using this, a pressed baguette having the composition shown in Table 5 was prepared.

Comparative Example 6 was prepared by adding talc instead of the coated titanium oxide C.

These results are shown in Table 5.

Example 4, Comparative Example 7 Fine particle-coated flaky oxide with a weight ratio of fine titanium oxide (average diameter 0.02μ)/flake titanium oxide (average size 10μ, average thickness 0°5μ) of 50/100. Titanium(
Coated titanium oxide D) was prepared. Using this, lipsticks having the compositions shown in Table 6 were prepared.

Instead of coated titanium oxide D, ordinary titanium oxide powder (A
-100, manufactured by Ishihara Sangyo) is shown in Table 6, Comparative Example 7.

The results are shown in Table 6.

Example 5, Comparative Examples 8 and 9 Powdered powder powder having the composition shown in Table 7 was prepared using the flaky titanium oxide coated with fine particles of titanium oxide prepared in Example 1.

For comparison, a product containing flaky titanium oxide and talc instead of the flaky titanium oxide coated with fine titanium oxide was also prepared.

These results are shown in Table 7.

These results show that the flaky titanium oxide coated with fine particles of titanium oxide is superior in elongation, adhesion, and gloss compared to flaky titanium oxide. Also, it can be seen that there is a big difference in stickiness and smoothness compared to talc.

Table 1 Reflectance of sectioned titanium oxide coated with fine titanium oxide Tube 2 Reflectance Table 3 Powder foundation Table 4 ? rM Raw Foundation Table 5 Pressed Powder Table 6 Ro-Beni Table 7 Wheat Powder

Claims (1)

[Scope of Claims] 1) A finishing cosmetic containing flaky titanium oxide whose surface is coated with fine particles of titanium oxide. 2) A flaky titanium oxide having a thickness of 0.2 to 2 μm and an average size of 0.8 to 2 μm. 3) A patent characterized in that the ratio of fine titanium oxide to flaky titanium oxide is 0.01 to 2 in terms of weight ratio. Finished cosmetic according to claim 2 4) The size of the fine titanium oxide is 0.005 to 0.1 in diameter.
The finished cosmetic according to claim 2, characterized in that the particle size is μm.