Neutral blue zirconium-vanadium pigments

Details Neutral blue zirconium-vanadium pigments Neutral blue zirconium-vanadium pigments

1993-05-12

1993-10-12

Group, Karl

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

106450, C08K 300

Patent

active

052521265

ABSTRACT:
Disclosed are neutral blue zirconium-vanadium pigments which do not display the disadvantages of previously known generic pigments, namely the high green component and the low color intensity and insufficient reproducibility in the case of neutral blue pigments. The neutral blue pigments with a rather high color intensity and good reproducibility are doped in the host lattice with phosphorus in addition to vanadium and are characterized by their color values in the CIE L*a*b* system. In order to produce such pigments, a zirconium-free mixture of powdery ZrO.sub.2, an SiO.sub.2 source, a vanadium compound and a phosphorus compound with an atomic ratio of Zr:Si:V:P=1:(0.95-1.10):(0.05-0.20):(0.005-0.03) as well as of a fluoride mineralizer is annealed after intensive grinding at 700.degree. to 900.degree. C.

REFERENCES:
patent: 3025178 (1962-03-01), Seabright
patent: 3058838 (1962-10-01), Olby

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