SiO2 coated pearlescent pigments

US7699927B2 · kind B2 · utility

Assignee

• ECKART GmbH · DE

Inventors

• Frank Henglein · Nuremberg, DE
• Ulrich Schmidt · Flörsheim, DE

Key dates

• Filing date: Aug 26, 2005
• Grant date: Apr 20, 2010
• Expiry date: Aug 26, 2025

Classification

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

Abstract

The invention relates to pearlescent pigments comprising platelet-shaped substrate, comprising metal oxide, and protective layer, said metal oxide having a refractive index of more than 1.8, where the protective layer is composed of an organic chemically surface modified SiO2 layer, the organic chemical surface modification being applied on the SiO2 layer. The invention further relates to a process for preparing these pearlescent pigments and to their use.