Chromium oxide green, a process for its production and its use

US5032377A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Jakob Rademachers · Krefeld, DE
• Hans-Ulrich Hofs · Krefeld, DE

Key dates

• Filing date: May 30, 1989
• Grant date: Jul 16, 1991
• Expiry date: May 30, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2111/12
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Chromium oxide green in the form of donut-shaped, ring-shaped or tire-shaped particles having an internal diameter of from 0.01 to 0.5 mm and an external diameter of from 0.05 to 1.0 mm is prepared by spraying an aqueous chromium oxide green suspension through a liquid pressure nozzle into a spray dryer such that the suspension entering the drying space of the spray dryer is rotating.