Patent · US Expired

Production of bismuth oxide/chromium oxide mixed phase pigments

US4563220A · kind A · utility

1Cited by

4References

9Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Peter Kohler · Djursholm, SE
Heinrich Heine · Krefeld, DE

Key dates

Filing date	Jun 29, 1983
Grant date	Jan 7, 1986
Priority date	—
Expiry date	Jun 29, 2003

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC01P2006/12
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

A bismuth oxide/chromium oxide mixed phase pigment having the composition Bi.sub.2-x Cr.sub.x O.sub.3 wherein 0.05.times.0.5 and a specification surface of about 1.0 to 10 m.sup.2 /g is produced by mixing metallic bismuth intensively with a chromium (III) and/or chromium (VI) compound, calcining the homogeneous mixture in an oxidizing atmosphere at a temperature of about 500.degree. to 800.degree. C., and crushing the product to pigment size.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.