Patent ID: 8337611

Claim:
Effect pigments, comprising synthetic mica flakes having an equivalence diameter distribution according to which 90% of the particles are in the range of 2 to 40 μm, and a thickness distribution according to which 90% of the particles are in the range of 100 to 3500 nm, and have a coating with a refractive index ≧1.9, which comprises titanium dioxide, and one or more low-solubility alkaline-earth metal compounds and optionally zinc oxide, wherein the low-solubility alkaline-earth metal compound is an alkaline-earth metal stannate, which is magnesium stannate, calcium stannate, strontium stannate or barium stannate, or an alkaline-earth metal zirconate, which is magnesium zirconate, calcium zirconate, strontium zirconate or barium zirconate, or wherein the mica flakes have a first layer of titanium dioxide and a second layer of zinc oxide and one or more low-solubility alkaline-earth metal compounds.