Metal oxide coated titanium dioxide lamellas

US6238472A · kind A · utility

Assignee

• Merck Patent GmbH · DE

Inventors

• Stephanie Andes · Hanau, DE
• Gerd Bauer · Kleinostheim, DE
• Gunter Brenner · Griesheim, DE
• Dieter Bruckner · Darmstadt, DE
• Michael Schmelz · Griesheim, DE
• Andrea Heyland · Ober-Kainsbach, DE
• Matthias Kuntz · Seeheim-Jugenheim, DE
• Karl Osterried · Dieburg, DE
• Gerhard Pfaff · Mainburg, DE

Key dates

• Filing date: Mar 9, 1999
• Grant date: May 29, 2001
• Expiry date: Mar 9, 2019

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09C2220/106
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

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.sub.2 O.sub.3, Fe.sub.3 O.sub.4, FeOOH or Cr.sub.2 O.sub.3, by a wet method, separating, drying and, if desired, calcining the material obtained.