Patent · US Expired

Inclusion pigments of zirconium silicate formed with spinel inclusions, a process for the preparation and use thereof

US5252125A · kind A · utility

5Cited by

8References

6Claims

0Family size

Assignee

Degussa AG · DE

Inventors

Dietrich Speer · Hanau, DE
Akos Kiss · Alzenau, DE
Peter Kleinschmit · Hanau, DE
Christel Zell · Rodenbach, DE

Key dates

Filing date	Mar 12, 1992
Grant date	Oct 12, 1993
Priority date	—
Expiry date	Mar 12, 2012

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC01P2002/32
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

Inclusion pigments are disclosed based on zirconium silicate as a casing component and cobalt-free spinels as discrete, included colored compounds. The inclusion pigments are prepared by fusing a mixture of a zirconium dioxide source, a silicon dioxide source, one or more mineralizer and cobalt-free oxides in a ratio suitable for spinel-formation. The inclusion pigments have high enamel-fastness and high color-fastness. Further, the pigments are drain-resistant under usual decoration firing conditions.

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