NACREOUS PIGMENTS HAVING IMPROVED LIGHT-FASTNESS, A PROCESS FOR THEIR PREPARATION, AND THEIR USE

摘要

"NACREOUS PIGMENTS HAVING IMPROVED LIGHT-FASTNESS, A PROCESS FOR THEIR PREPARATION, AND THEIR USE" Nacreous pigments having a yellow powder color and an improved light-fastness comprise a mica platelet coated with titanium dioxide and on the titanium dioxide layer, a thin layer of calcined chromium oxide and/or chromium phosphate as a protective layer. The pigments are produced by coating mica platelets coated with metal oxides and/or hydroxides, with a thin layer of a sparingly soluble chromium(III) compound and calcining at about 500 - 1000.degree. C.