Silver-colored luster pigment

US6840993B2 · kind B2 · utility

Assignee

• Merck Patent GmbH · DE

Inventors

• Christoph Schmidt · Kriftel, DE
• Andrea Heyland · Ober-Kainsbach, DE
• Claudia Fornoff · Otzberg, DE
• Hans-Dieter Bruckner · Darmstadt, DE

Key dates

• Filing date: Apr 21, 2003
• Grant date: Jan 11, 2005
• Expiry date: Apr 21, 2023

Classification

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

Abstract

The present invention relates to silver-colored luster pigments based on multiply coated platelet-shaped substrates, which has at least one layer sequence of TiO2, a colorless coating and another TiO2 layer. The pigment can optionally have an outer protective layer. These luster pigments are useful and to the use thereof in paints, coatings, printing inks, including security printing inks, plastics, ceramic materials, glasses, cosmetic formulations and for producing pigment preparations and dry product forms such as granules, chips, pellets and briquettes.