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US 3,951,679 AGranted
Colored pigments
AssigneeMerck Patent GmbH
InventorsHorst Bernhard, Alfred Stein, Reiner Esselborn, Reiner Hesse, Horst Russmann
Life of this patent
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Abstract
Blue colored mica flake pigments are provided by coating mica flakes, or mica flakes optionally coated with a uniform metallic oxide layer, with a uniform layer of a low-solubility iron compound convertible into Berlin blue [ferric hexacyanoferrate(II)], and then converting this layer into Berlin blue.
Claims9
A colored mica flake pigment having a layer of ferric hexacyanoferrate(II) on the mica flakes as a color-imparting uniform coating.
Dependencies are inferred from the claim text.