Colored Metal Pigments, Method for the Production Thereof, Use of the Colored Metal Pigments in Cosmetics, and Cosmetic Containing These
The invention relates to a colored, platelet-shaped metal pigment comprising a base pigment comprising metal, a layer of silicon dioxide, and, subsequently, a layer or two or more layers comprising one or more coloring materials. The invention further relates to a method for the production of a colored metal pigment of this kind, and also to the use thereof in cosmetics.
1 . A colored, platelet-shaped metal pigment comprising a base pigment comprising metal, a layer of silicon dioxide, and, subsequently, at least one additional layer comprising one or more coloring materials, wherein the coloring material in at least one said additional layer is Prussian Blue or carmine red.
2 . The colored metal pigment of claim 1 , wherein the base pigment is comprised of a material selected from the group consisting of aluminum, copper, zinc, iron, gold, bronze, silver and alloys thereof.
3 . The colored metal pigment of claim 1 , wherein the base pigment is precoated.
4 . The colored metal pigment of claim 1 , wherein the base pigment is precoated with a layer of aluminum oxide.
5 . The colored metal pigment of claim 1 , wherein the coloring material comprises a metal oxide.
6 . The colored metal pigment of claim 1 , wherein the one or more coloring materials comprise mixtures or successive layers of at least one of FeOOH, Fe2O3, Prussian Blue and carmine red.
7 . The colored metal pigment of claim 6 , wherein the successive layers are FeOOH and Prussian Blue.
8 . The colored metal pigment of claim 6 , wherein the successive layers are carmine red and Prussian Blue.
9 . A method of producing a colored metal pigment according to claim 1 , comprising the following steps:
a. coating a base metal pigment with SiO 2 ,
b. dispersing the metal pigment coated in step (a) in a liquid phase,
c. adding at least one solution of at least one metal salt to generate coloring materials,
d. separating off the colored metal pigment obtained in step (c), and
e. optionally drying the colored metal pigment obtained in step (d).
10 . The method of claim 9 , wherein in step (c) the pH is set in the range from 1.7 to 9.5.
11 . The method of claim 9 , wherein the pH is kept constant by metered addition of a suitable acid or base.
12 . The method of claim 9 , wherein in step (a) said coating takes place using a sol-gel process.
13 . The method of claim 9 , wherein in step (a) waterglass is used.
14 . A method of producing a cosmetic, selected from the group consisting of eyeshadows, mascara, lipsticks, makeup formulations, creams, powders, eyeliners, nail varnish, haircare compositions, soap, sun protection compositions and perfume, which comprises formulating said cosmetics with a colored metal pigment according to claim 1 .
15 . A cosmetic comprising colored metal pigment according to claim 1 .
16 . The colored metal pigment of claim 5 , wherein the metal oxide is selected from the group consisting of FeOOH, Fe 2 O 3 , Cr 2 O 3 and mixtures thereof.
17 . The method of claim 9 , wherein water is selected as the liquid phase.