Mixed phases having the composition Bi.sub.2-x Cr.sub.x O.sub.3 and a process for their production

US4529448A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Peter Kohler · Djursholm, SE
• Peter Ringe · Bensberg, DE
• Heinrich Heine · Krefeld, DE

Key dates

• Filing date: Jul 5, 1983
• Grant date: Jul 16, 1985
• Expiry date: Jul 5, 2003

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2006/60
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Yellow to orange-red bismuth oxide-chromium oxide mixed phase pigments having a specific surface from about 1 to 10 m.sup.2 /g and the composition Bi.sub.2-x Cr.sub.x O.sub.3 wherein x is from about 0.05 to 0.5 are produced by mixing the appropriate quantities of finely disperse bismuth-(III)- and chromium-(III)- or chromium-(VI)-compounds, calcining the mixture in air at a temperature from about 500.degree. to 800.degree. C. and subsequently grinding. The products are suitable for pigmenting lacquers, plastics and dispersion dyes.