Merck Patent Gesellschaft MIT Beschrankter Haftung

Merck Patent Gmbh

Merck Patent Gesellschaft

Martin Knapp

Ralf Anselmann

Tamio Noguchi

Lilia Heider

Kurt Marquard

Manuela Loch

Uta Hillg&auml;rtner

Gisela Lenz

Wilfried Baron

Norbert Rick

Kazhisa Iwasa

The present invention relates to inorganic spherical absorption pigments which have a bimodal particle-size distribution, at least one color-providing layer and a final SiOlayer, and to the use thereof in paints, coatings, printing inks, security printing inks, plastics, ceramic materials, glasses, as tracers, in cosmetic formulations and for the preparation of pigment preparations and dry preparations.

Inorganic spherical absorption pigments

Highly light-scattering pigment mixture

Spherical SiO.sub.2 particles with a size of from 5 to 500 nm coated at individual points with TiO.sub.2, Fe.sub.2 O.sub.3 or ZrO.sub.2 particles with a size of less than 60 nm. The coated SiO.sub.2 particles can be aftercoated with silanes or further metal oxides. The products obtained are used for pigmenting paints, printing inks, plastics and coatings or as sunscreen agents.

Coated spherical SiO.sub.2 particles

Dispersions of spherical inorganic particles

Growing community of inventors

Dieburg, Germany

Martin Knapp