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US 11,034,841 B2Granted
Carbon black in effect pigments
AssigneeBASF SE
InventorsLizzabeth Ponce, Geoffrey Johnson, Louis R. Cerce, Steven Jones, Curtis Zimmermann
Life of this patent
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Abstract
The present application is directed to combination effect pigments comprising an effect pigment and carbon black, wherein the carbon black is adherently deposited on the effect pigment interposed within the substrate and at least one subsequent layer of the effect pigment. This structure of the combination effect pigment results in advantageous non-staining properties of the pigment and maximizes color effects of the carbon black.
Claims23
A combination effect pigment comprising
- i) an effect pigment, which effect pigment comprises a platelet like substrate and at least one optical layer, and
- ii) a layer of a hydrous oxide or a hydroxide precipitate of carbon black and a polyvalent cation and the layer of the hydrous oxide or a hydroxide precipitate of carbon black precipitate is between the substrate and the at least one optical layer, and the at least one optical layer is different than the layer of hydrous oxide or hydroxide precipitate of carbon black;
- wherein the weight ratio of hydrous oxide or a hydroxide precipitate of carbon black to the polyvalent cation is from about 3 to 1 to about 1 to 3.
Dependencies are inferred from the claim text.