Pigments containing carbon black

US5286291A · kind A · utility

Assignee

• Merck Patent GmbH · DE

Inventors

• Klaus Bernhardt · Groß-Umstadt, DE
• Gerhard Pfaff · Mainburg, DE

Key dates

• Filing date: Jul 7, 1993
• Grant date: Feb 15, 1994
• Expiry date: Jul 7, 2013

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08K3/34
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

The invention relates to a pigment containing carbon black having improved abrasion resistance comprising a platelet-shaped substrate coated with a metal oxide layer containing carbon black, wherein the carbon black is fixed on the substrate by means of an anionic or cationic and a nonionic surfactant and an organosilane compound.