Electrically conductive pigments

US5350448A · kind A · utility

Assignee

• Merck Patent GmbH · DE

Inventors

• Johann Dietz · Dietzenbach, DE
• Klaus-Dieter Franz · Kelkheim, DE
• Gerhard Pfaff · Mainburg, DE
• Reiner Vogt · Darmstadt, DE
• Katsuhisa Nitta · Iwaki, JP

Key dates

• Filing date: Apr 22, 1993
• Grant date: Sep 27, 1994
• Expiry date: Apr 22, 2013

Classification

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

Abstract

A process for the preparation of light-colored, electrically conductive pigments based on substrates having an expansion of not more than 500 .mu.m, which pigments consist of one or more metals, metal oxides or materials containing metal oxide, silicon oxide or silicate materials and contain, if desired above one or more other metal oxide and/or silicon oxide layers, an outer layer based on halogen-doped tin oxide and/or titanium oxide.