Surface-modified pigments

US5468289A · kind A · utility

Assignee

• Merck Patent GmbH · DE

Inventors

• Gerhard Herget · Ober-Ramstadt, DE
• Margarete Herbski · Ober-Ramstadt, DE
• Karl Osterried · Dieburg, DE

Key dates

• Filing date: Sep 30, 1994
• Grant date: Nov 21, 1995
• Expiry date: Sep 30, 2014

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 surface-modified pigments based on platelet-like substrates which, for improving the settling and redispersion behavior, have been recoated with a mixture comprising two metal oxides selected from the group consisting of silica, alumina and zirconium dioxide.