Merck Patent Gmbh

Merck Patent Gesellschaft MIT Beschrankter Haftung

Dieter Br&uuml;ckner

Gerhard Pfaff

Matthias Kuntz

Stephanie Andes

Karl Osterried

Michael Schmelz

Gerd Bauer

Andrea Heyland

G&uuml;nter Brenner

Reiner Vogt

Gerald Fuchs-Pohl

Multilayer interference pigment consisting of plateletlike titanium dioxide as carrier material, coated with alternating layers of metal oxides of low and high refractive index, the difference in the refractive indices being at least 0.1, which is obtainable by solidification and hydrolysis of an aqueous solution of a thermally hydrolyzable titanium compound on a continuous belt, detachment of the resulting coat, coating of the resulting titanium dioxide platelets, with or without drying in between, by a wet method with, alternately, a metal oxide hydrate of high refractive index and a metal oxide hydrate of low refractive index by hydrolysis of the corresponding, water-soluble metal compounds, separation, drying and, if desired, calcining of the material obtained.

Multi-coated interference pigments

Multilayer interference pigment consisting of plateletlike titanium dioxide as carrier material, coated with alternating layers of metal oxides of low and high refractive index, the difference in the refractive indices being at least 0.1, which is obtainable by solidification and hydrolysis of an aqueous solution of a thermally hydrolysable titanium compound on a continuous belt, detachment of the resulting coat, coating of the resulting titanium dioxide platelets, with or without drying in between, by a wet method with, alternately, a metal oxide hydrate of high refractive index and a metal oxide hydrate of low refractive index by hydrolysis of the corresponding, water-soluble metal compounds, separation, drying and, if desired, calcining of the material obtained.

Multilayer interference pigments

Multilayer pearl luster pigment based on an absorbing platelet-shaped substrate which is coated with alternating layers of a material of low refractive index and a material of high refractive index, or with a metal, the difference in the refractive indices being at least 0.1.

Multilayer pearl luster pigment based on an opaque substrate

Colored pearl luster pigment consisting of a core of platelet shaped titanium dioxide and one or more layers of other metal oxides or metal oxide hydrates obtainable by solidifying an aqueous solution of a thermally hydrolyzable titanium compound on a continuous belt, detaching the resulting layer, coating the resulting titanium dioxide platelets, with or without drying in between, with one or more other metal oxides or metal oxide hydrates, for example Fe,O,, Fe,O,, FeOOH or Cr,O,, by a wet method, separating, drying and, if desired, calcining the material obtained.

Metal oxide coated titanium dioxide lamellas

Growing community of inventors

Darmstadt, Germany

Dieter Brückner

Growing community of inventors

Darmstadt, Germany

Dieter Br&uuml;ckner

Dieter Brückner