Non-lustrous pigments

US6019831A · kind A · utility

Assignee

• Merck Patent GmbH · DE

Inventors

• Christoph Schmidt · Kriftel, DE
• Claudia Seibel · Otzberg, DE
• Margarete Herbski · Ober-Ramstadt, DE
• Ralf Emmert · Bayonne, US
• Klaus Ambrosius · Frankfurt, DE

Key dates

• Filing date: Feb 5, 1997
• Grant date: Feb 1, 2000
• Expiry date: Feb 5, 2017

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2993
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The present invention relates to non-lustrous iron oxide-containing color pigments based on dry-milled inorganic plateletlike substrates having a particle size of <60 .mu.m, characterized in that the iron oxide compound is yellow FeO(OH) and/or Fe.sub.2 O.sub.3.