Inclusion pigments of zirconium silicate with included chromic oxide, a process for the preparation and use thereof

摘要

Inclusion pigments are discolored having zirconium silicate as a casing component and chromium (III) oxide (Cr2O3) as a discrete, included color compound. The included Cr2O3 has a D50 value in the range of 0.1 to 3.0 mu m and a brilliant light green color. Contrary to non-included Cr2O3 of identical value, the pigments of the present invention may be used for the preparation of decorations without problems and difficulties in their application and maintaining sharp lines and contours. The pigments are suitable for direct pressing and high temperature firing processes. They are prepared by fusing a mixture of zirconium dioxide, silicon dioxide, mineralizators and chromium oxide.