Halogen-free zinc ferrite yellow pigments containing alumina and phosphorus oxide and production

US4443264A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Franz Hund · Krefeld, DE
• Willi Hennings · Krefeld, DE
• Horst Brunn · Meerbusch, DE
• Peter Kresse · Krefeld, DE
• Wolfgang Rambold · Krefeld, DE

Key dates

• Filing date: Aug 30, 1982
• Grant date: Apr 17, 1984
• Expiry date: Aug 30, 2002

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2006/60
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A zinc ferrite pigment comprising, by weight, about 99.8 to 90% of ZnFe.sub.2 O.sub.4 and about 0.2 to 10% of the component system (1-x)Al.sub.2 O.sub.3 and xP.sub.2 O.sub.5 wherein 0<x<1 is produced by calcining a suitable mixture of compounds. The resulting pigments are of high color quality and are substantially halogen-free, rendering them especially useful industrially even as anti-corrosion pigments.