Red iron oxide pigments with improved coloring properties

US5059250A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Wilfried Burow · Krefeld, DE
• Horst Brunn · Meerbusch, DE
• Peter Kresse · Krefeld, DE
• Hans Sander · Ludwigshafen, DE

Key dates

• Filing date: Mar 24, 1986
• Grant date: Oct 22, 1991
• Expiry date: Mar 24, 2006

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2004/84
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Red iron oxide pigments with improved coloring properties wherein the isoelectric point of the pigments is greater than 7.