Neutral blue zirconium vanadium pigments

摘要

The invention is directed to neutral-blue zirconium-vanadium pigments which do not have the disadvantages of previously known generic pigments, namely the high proportion of green or the low color intensity and insufficient reproducibility in the case of neutral-blue pigments. The neutral blue pigments according to the invention with higher color intensity and good reproducibility are doped with phosphorus in addition to vanadium in the host lattice and are characterized by their color values in the CIE-L * a * b * system. To produce the pigments according to the invention, a zircon-free mixture of powdered ZrO2, a source for SiO2, a vanadium and a phosphorus compound with an atomic ratio Zr: Si: V: P = 1: (0.95-1.10) :( 0, 05-0.20) :( 0.0005-0.03) and a fluoride mineralizer after intensive grinding at 700 to 900 ° C.