Coated spherical SiO.sub.2 particles
AssigneeMerck Patent GmbH
InventorsTamio Noguchi, Kazhisa Iwasa, Ralf Anselmann, Martin Knapp, Manuela Loch
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Abstract
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.
Claims25
A non-porous spherical SiO.sub.2 particle having a diameter of 5 to 500 nm with a non-continuous coat of metal oxide, particles, wherein the metal oxide is TiO.sub.2, or a mixture of TiO.sub.2 and Fe.sub.2 O.sub.3.
Dependencies are inferred from the claim text.