JPH0574564B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a new cosmetic, which takes advantage of the excellent properties of extender pigments, such as transparency, fluidity, smooth spread on the skin, and adhesive strength, while suppressing excessive gloss. The present invention provides cosmetics, especially makeup cosmetics, that have excellent effects. Extender pigments usually added to make-up cosmetics are often in the form of thin plates, and therefore often have a more or less unique luster. The intensity of this luster is unique depending on conditions such as the type of extender pigment, the origin of the raw stone, the manufacturing method, and the particle size distribution. On the other hand, make-up cosmetics are required to have various types of gloss, especially gloss intensity, due to their cosmetic properties. The glossiness of the entire system has been adjusted by appropriately combining extender pigments that do not have luster with extender pigments that have strong luster, such as mica or sericite, and adjusting their blending amounts. . However, when a large amount of the above-mentioned extender pigments having strong luster is used, when applied to the skin, there is a tendency to give the skin a glossy appearance or an unnatural luster. In order to solve this problem, it was necessary to keep the amount of the glossy extender pigment to a low level. As a result, the present situation is that extender pigments cannot fully exhibit their excellent properties such as transparency, fluidity, smooth spread on the skin, and adhesive strength. Therefore, in view of the current situation, the present inventors conducted intensive research in order to develop a useful powder, and as a result, they found that by coating the surface of an extender pigment with one or more types of inorganic silicon compounds. , can reduce the unnatural luster of extender pigments,
This makes it possible to obtain the desired luster for each cosmetic without requiring the conventional adjustment of the amount of extender pigments. They also discovered that the coated pigment thus obtained has the excellent properties of the pigment before coating, such as transparency, fluidity, smooth spread on the skin, and adhesive strength,
We have completed the present invention. The present invention provides cosmetics based on this knowledge. The present invention provides a coated pigment in which the surface of an extender pigment selected from talc, mica, sericite, and kaolin is coated with one or more kinds of inorganic silicon compounds, and the coated pigment comprises the extender pigment selected from talc, mica, sericite, and kaolin. The present invention relates to a cosmetic composition containing at least one coated pigment having a composition ratio (weight ratio) of 98:2 to 70:30. Extender pigments used in the present invention include talc,
It is selected from kaolin, mica, and sericite. Further, in the present invention, these extender pigments having an average particle diameter in the range of 1 μm to 50 μm are preferably used. If the average particle diameter exceeds 50 μm, it tends to give a strange feeling when used in cosmetics, and if it is less than 1 μm, the transparency and fluidity will decrease, which is undesirable. Next, as the inorganic silicon compound which is the coating substance applied to the coated pigment of the present invention, divalent or trivalent compounds such as silicic acid, silicon dioxide, aluminum silicate, magnesium silicate, calcium silicate, magnesium aluminum silicate, calcium aluminum silicate, etc. Examples include silicate compounds containing these metals, which may be used singly, in combination, or as a mixture. There are various methods for coating the surface of the extender pigment with these inorganic silicon compounds, and examples include the following three methods. 1 0.2 to 3.5 parts of inorganic silicon compound fine powder and extender pigment
A coated pigment is obtained by mixing and pulverizing 10 parts of the pigment in a wet or dry manner, and coating the surface of the extender pigment with an inorganic silicon compound through a mechanochemical reaction. In this case, the inorganic silicon compound serving as the coating material is preferably a fine powder with an average particle size of 1 μm or less. When the average particle diameter is larger than 1 μm, it is difficult to obtain a uniform coated surface, and secondary particles are likely to increase. 2. Disperse 10 parts of extender pigment uniformly in an aqueous solution containing 0.2 to 3.5 parts of sodium silicate, potassium silicate, etc., heat to 70°C to 95°C, preferably 85°C to 90°C, and add this alkaline mixture to mineral The pH is adjusted to 7-11, preferably 9-10 using an acid, preferably dilute hydrochloric acid, dilute sulfuric acid, etc., and stirring is continued. Further, the method is neutralized until the pH becomes around 7, followed by filtration, washing, drying, and optionally sintering at 200°C to 500°C to obtain a silicon dioxide-coated pigment. A method of obtaining a coated pigment in which the surface of an extender pigment is coated with a silicate compound by using an aqueous solution of a metal salt such as aluminum sulfate, magnesium chloride, or zinc sulfate instead of using a mineral acid during the pH adjustment. 3. 10 parts of extender pigment is uniformly dispersed in an alcohol solution in which 0.2 to 40 parts of an organosilicon compound, such as ethyl silicate or dichloroethyl silicate, etc., is dissolved in alcohol such as methanol or ethanol, and the mixture is heated at a temperature of 20°C to 60°C. Add alkaline hydroalcohol within range and continue stirring. Then filter, wash, dry and if necessary 200
A method of obtaining a coated pigment coated with silicon dioxide by sintering at a temperature of 500°C to 500°C. The coated pigment used in the present invention can be produced by the method described above, and in the coated pigment obtained, the composition ratio of the extender pigment and the inorganic silicon compound as the coating substance is 98:2 to 70: 30, and is appropriately adjusted within the range according to the desired gloss. If the ratio of the coating substance to the extender pigment is less than the above ratio, the desired gloss adjustment effect will be insufficient, and if the ratio of the coating substance is more than the above ratio, it will be difficult to achieve a uniform coating, and the secondary particles will Problems such as formation and caking are likely to occur, making it unsuitable for the present invention. The coated pigment used in the present invention can be widely used in cosmetics using extender pigments, and the cosmetics obtained by the present invention can be used for make-up makeup such as foundation, powder powder, solid powder, blusher, eye shadow, etc. To provide a cosmetic that has a smooth, uniform and controlled gloss, is highly safe, has an excellent feeling of use, and has excellent physical properties. It can be blended into cosmetics in the same way as conventional extender pigments, and the blending amount can be arbitrarily selected depending on the properties of the cosmetic, but it should not exceed 5% of the total weight of the cosmetic ingredients.
~90%. This takes advantage of the excellent properties inherent to extender pigments, such as transparency, fluidity, smooth spread on the skin, and adhesion, while also adjusting the gloss of the applied cosmetics. % or more is required. The upper limit is not particularly limited, but it is preferably about 90%, considering the addition of colorants, oils, fragrances, etc. Next, an example of manufacturing the coated pigment used in the present invention will be shown. Production example 1 10 parts of talc with an average particle size of 20μ was stirred and mixed into 100 parts of an aqueous solution containing 1 part of sodium orthosilicate to uniformly disperse it, and 0.1N diluted hydrochloric acid was added dropwise at 85°C to adjust the pH. 9-10 were prepared and continued stirring. After this, diluted hydrochloric acid was further added dropwise to neutralize the pH until it reached 7. Next, this was filtered, and the resulting powder was washed with an appropriate amount of water, the filtration process was repeated three times, and the mixture was heated at 50℃ for 24 hours. It was dried and then ground in a Henschel type mixer to obtain 10.2 parts of silicon dioxide-coated talc. Production Example 2 By using the same technical operation as in Production Example-1 and using mica with an average particle size of 30μ instead of talc with an average particle diameter of 20μ, silicon dioxide-coated mica was produced.
10. Got 2 copies. Production Example 3 10 parts of sericite with an average particle size of 20μ was stirred into 100 parts of an ethanol solution containing 3.5 parts of ethyl orthosilicate.
Mix and disperse uniformly, add 0.5N sodium hydroxide aqueous ethanol solution dropwise at 50℃, and adjust the pH.
was adjusted to about 10 and continued stirring. Next, the powder obtained by filtering this was washed with an appropriate amount of 50% aqueous ethanol, and the filtration was repeated three times at 50°C.
Dry under warm air for 24 hours, then crush with a Henschel type mixer to form silicon dioxide-coated sericite.
Got 10.6 copies. Production Example 4 Using the same technical procedure as in Production Example 3, 10.5 parts of silicon dioxide-coated kaolin was obtained by using kaolin with an average particle size of 10 μm instead of sericite with an average particle size of 20 μm. Production example 5 10 parts of talc with an average particle size of 20μ, average particle size of 0.01μ
A slurry consisting of 2 parts of aluminum/magnesium silicate, 6 parts of ethanol, and 24 parts of water was mixed in a ball mill for 24 hours, ground, and then filtered. The resulting powder was washed with an appropriate amount of water and filtered. Repeat 3 times, dry under warm air at 50℃ for 24 hours, and then
It was ground in a Henschel type mixer to obtain 11.4 parts of aluminum/magnesium silicate coated talc. Production Example 6 11.6 parts of aluminum/magnesium silicate coated mica was obtained by using the same technical operation as in Production Example 5 and using mica with an average particle size of 30 μm instead of talc with an average particle size of 20 μm. Next, examples of the cosmetics of the present invention will be shown. Example 1 Cream Foundation A Stearic acid 1.0 parts by weight Glyceryl monooleate 1.0 Cetyl alcohol 2.5 Liquid paraffin 12.0 Polyoxyethylene hydrogenated castor oil 0.5 Silicon dioxide coated talc of Production Example-1 11.0 Titanium dioxide 3.0 Bengara 1.0 Yellow iron oxide 2.0 Black iron oxide 1.0 B Propylene glycol 5.0 1% aqueous sodium hydroxide solution 13.6 Purified water 46.2 Butyl paraoxybenzoate 0.2 Heat each of A and B to 80°C, gradually add B to A, and mix in an emulsifying pot. Emulsify, then cool to 30°C while stirring, and fill into containers to make the product. Example 2 Cake-like foundation (a) A Talc coated with aluminum magnesium silicate of Production Example 5 54.5 parts by weight Aluminum magnesium silicate coated mica of Production Example 6 20.0 Titanium dioxide 4.0 Bengara 1.0 Yellow iron oxide 2.0 Black iron oxide 1.0 Aluminum stearate 3.0 Calcium silicate beads 6.0 Liquid paraffin 8.5 A is mixed in a Henschel mixer, crushed in a hammer mill, then B is added, mixed in a Henschel mixer, crushed in a hammer mill, and placed in a mold. Press to make a product. Example 3 Cake-like foundation (b) A Silicon dioxide-coated talc of Production Example-1 44.5 parts by weight ″-2 Silicon dioxide-coated mica 10.0 ″-3 Silicon dioxide-coated sericite 20.0 Titanium dioxide 4.0 Bengara 1.0 Yellow Iron oxide 2.0 Black iron oxide 1.0 Aluminum stearate 3.0 Calcium silicate beads 6.0 B Liquid paraffin 8.5 A product was obtained in the same manner as in Example-2. Example 4 Finishing Powder A Silicon dioxide-coated talc of Production Example-1 45.0 parts by weight ''-4 silicon dioxide-coated kaolin 15.0''-3 silicon dioxide-coated sericite 15.0 Titanium dioxide 4.0 Bengara 1.0 Yellow iron oxide 2.0 Black Iron oxide 1.0 Silk powder 5.0 Calcium silicate beads 6.0 Zinc myristate 3.0 B Liquid paraffin 3.0 Mix A with a Herschel mixer, grind with a hammer mill, add B, mix with a Herschel mixer, and then transfer to a blower sifter. The product is then processed and filled into containers. The coated pigment according to the present invention has excellent properties not found in conventional extender pigments, and does not give an unnatural gloss when used in cosmetics, and also has transparency, fluidity, and good properties on the skin. It also has excellent properties such as smooth spread and adhesive strength, making it an excellent powder for cosmetics. In addition, by freely selecting the types and coating ratios of extender pigments and coating substances such as silicon dioxide and silicate compounds within a predetermined range, it is possible to obtain powders with desired luster and physical properties, which can be used in cosmetics. It can be widely used as a powder for commercial purposes. Next, in order to examine the gloss of the coated pigment used in the present invention, the light reflectance was measured for the extender pigment before coating and the processed powder after coating, and the results are shown in Table 1. The higher the reflectance, the higher the gloss.
The test method is as follows. Gloss test: Microcrystalline wax was uniformly coated on cowhide, and the sample powder was spread evenly on this with a horsehair brush, and the light reflectance was measured. The measurement was performed using a GROSS METER manufactured by Nippon Denshoku Kogyo Co., Ltd. to measure reflected light at an angle of 75°.

【table】

[Table] As described above, the coated pigment used in the present invention has a lower light reflectance than the extender pigment, which is the inner core substance, and in other words, the gloss is suppressed, and when applied to the skin, it does not have a shiny or shiny appearance. , it is possible to provide a cosmetic that does not give an unnatural shine. Next, in order to examine the transparency of the coated pigment used in the present invention, the whiteness of the extender pigment before coating and the processed powder after coating was measured and shown in Table 2. It can be said that the lower the whiteness, the greater the transparency. The test method is as follows. Transparency test: Samples were processed in the same manner as used in the gloss test. About this item JIS L 1074 "Whiteness"
Whiteness was measured using a high-speed colorimeter manufactured by Murakami Shikiken.

[Table] As described above, the coated pigment used in the present invention exhibits a whiteness value similar to that of the uncoated extender pigment, which is the inner core substance, that is, it has the same transparency.
It is a useful cosmetic powder. Next, in order to examine the fluidity of the coated pigment used in the present invention, the angle of repose of the extender pigment before coating and the processed powder after coating was measured and shown in Table 3. The smaller the angle of repose, the greater the fluidity. The test method is as follows. Fluidity test: The angle of repose of the sample was measured using a powder tester manufactured by Hosokawa Micron.

[Table] As described above, the coated pigment used in the present invention has a repose angle value similar to that of the uncoated extender pigment, which is the inner core material, and has the same fluidity.
It is convenient to handle when manufacturing cosmetics, and spreads smoothly on the skin. Next, cosmetics applied to the present invention (Examples 1 to 3)
Regarding 4), a sensory evaluation was conducted and the results are shown in Table 4. At this time, as a control product, each cosmetic was mixed with an uncoated extender pigment (inner core substance of processed powder) instead of the coated pigment used in the present invention, and sensory evaluation was performed. The test method is as follows. Sensory test: A total of 7 mixed male and female panelists evaluated the following three sensory evaluation items: gloss of the skin with makeup, smoothness of spread on the skin, and transparency of the skin with makeup. The average value of the names was used as the evaluation score.

[Table] Cloud
picture
Na
stomach

【table】

[Table] Numerical values are sensory test evaluation points As described above, even when the cosmetics applied to the present invention are actually applied to the skin, they do not make the skin with makeup too shiny, and do not give a shiny or shiny appearance. It did not give an unnatural shine, and the sensory properties such as smoothness of spread on the skin and transparency of the skin after makeup were similar to conventional control products. As described above, the coated pigment used in the present invention has the excellent properties of conventional extender pigments, and at the same time has a novel gloss control ability, and has excellent properties not found in conventional extender pigments for cosmetics. It can be seen that the powder has a

Claims (1)

[Scope of Claims] 1. A coated pigment in which the surface of an extender pigment selected from talc, mica, sericite, and kaolin is coated with one or more inorganic silicon compounds, wherein the extender pigment and the A cosmetic comprising at least one coated pigment having a composition ratio (weight ratio) of 98:2 to 70:30 with respect to an inorganic silicon compound. 2. The cosmetic according to claim 1, wherein the inorganic silicon compound is silicon dioxide and/or a silicate compound.