Spinel black pigments based on copper-chromium-manganese mixed oxides, a process for their preparation and their use

US5250112A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Klaus Wussow · Netphen, DE
• Peter Kuske · Krefeld, DE
• Manfred Mansmann
• Dieter Messer · Odenthal, DE
• Dieter Rade · Krefeld, DE

Key dates

• Filing date: Nov 20, 1992
• Grant date: Oct 5, 1993
• Expiry date: Nov 20, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2006/80
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Spinel black pigments are prepared by annealing oxides, hydroxides or carbonates of copper, chromium and manganese and grinding the product. The manganese-yielding component is Mn.sub.3 O.sub.4.