Intensely colored interference pigments

US6692561B1 · kind B1 · utility

Assignee

• MERCK PATENT GESELLSCHAFT MIT BESHRANK TER HAFTUNG · DE

Inventors

• Sabine Schoen · Darmstadt, DE
• Klaus Bernhardt · Groß-Umstadt, DE
• Christoph Schmidt · Kriftel, DE

Key dates

• Filing date: Sep 5, 2002
• Grant date: Feb 17, 2004
• Expiry date: Sep 5, 2022

Classification

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

Abstract

The invention relates to intensely colored interference pigments based on multi-layered plate-like substrates with at least two sequences of layers consisting of (A) a colorless layer with a refraction index n≦1,8; (B) a high-index layer consisting of a mixture of TiO2 and Fe2O3 in a ratio of 1:0.1 to 1:5 and optionally, one or more metal oxides in quantities of to layer (B); and optionally (C) an outer protective layer.