Cosmetic
A technology for cosmetics and oxide films, applied in the direction of cosmetics, cosmetics, cosmetic preparations, etc., can solve the problems of discoloration, metal allergic reactions, denaturation, etc., to prevent adhesion or agglomeration, improve surface smoothness, and improve the effect of feeling
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[0013] The present invention relates to a cosmetic in which a powder is mixed, wherein a metal film formed on a base material is further covered with a metal oxide film, thereby preventing leaching of metal ions, thereby preventing discoloration / degeneration and metal allergic reaction of cosmetics appearance while still having a high shimmering sheen.
[0014] Metallic thin films exhibit a characteristic metallic luster, so materials containing powder base materials with metallic thin films on their surfaces can be used as glitter pigments. However, unless the above-mentioned problem of leaching of metal ions is solved, this material cannot be used as a raw material for cosmetics directly applied to human skin. A metal oxide film is thus further provided on the metal film, thereby preventing leaching of metal ions without impairing the metallic luster of the metal film.
[0015] As long as the metal oxide film is on the outer layer of the powder than the metal film, the abov...
Embodiment 1-6
[0037] First, a suitable material selected from Metashine PS series glass flakes with a silver film was used as a base material with a metal thin film, and a silicon dioxide film was formed on its surface by the following method.
[0038] The Metashine PS of 50g is suspended in the pure water of 0.5 liters, and simultaneously water bath is kept under the temperature of 75 ℃, suitably weighs sodium silicate solution (silicon dioxide solid content 37.1%, by Wako Pure Chemical Industries, Ltd .preparation) and then diluted 10 times with pure water to obtain a solution which was added to the above suspension. At the same time the pH of the suspension was maintained at 9.2-9.4 with 3.5% by weight hydrochloric acid. After the addition was complete, stirring was continued at 75°C for 30 minutes. Thereafter, the suspension was filtered with filter paper, and the filtered solid was recovered, and after washing with water and making the pH neutral, dried at 100° C. for 2 hours, thereby...
Embodiment 1-3
[0043] The tests of the above examples were carried out on different types of Metashine PS not formed with a silicon dioxide film. The results are described in Table 2 below. Table 2 Comparative Example 1 2 3 Average thickness (μm) 5.0 1.3 1.3 Average particle size (μm) 90 80 15 Silica film weight % 0 0 0 Silver leaching rate 1 (ppm) 9.2 131.2 261.1 Silver leaching rate 2 (ppm) 3.3 1.9 1.4 discoloration of organic matter slightly yellow yellow yellow
[0044] It can be seen from Table 1 that for all the powders with a silicon dioxide film on it, the leaching rate of silver into water is very low, no more than 3.3ppm, and the leaching rate of silver into organic solvents is also very low, no more than 1.2ppm . In addition, it can be seen that the discoloration effect of organic matter does not occur since the leaching of metal ions is suppressed.
[0045] On the other hand, it can be seen from Table 2 that the leaching rate of silver into water is very high at 9-261 ppm due ...
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Abstract
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