Brown to gray inclusion pigments and method of their production

Details Brown to gray inclusion pigments and method of their production Brown to gray inclusion pigments and method of their production

1990-12-27

1991-08-27

Bell, Mark L.

Compositions: coating or plastic

Materials or ingredients

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

106457, C08K 310

Patent

active

050430165

ABSTRACT:
The invention relates to new brown to gray inclusion pigments, based on zirconium silicate as casing substance, which are characterized in that they contain mixed crystals of the type (Fe.sub.1-x Mn.sub.x).sub.2 O.sub.3, in which x stands for a number in the range from 0.05 to 0.60, as colored compounds. The production takes place by means of annealing a mixture of SiO.sub.2 and ZrO.sub.2, or of precursors, in the presence of iron compounds and manganese compounds, in an Fe/Mn atomic ratio of 90:10 to 20:80, and mineralizers at 750.degree. to 1200.degree. C. The brown pigments are formed especially at temperatures of 850.degree. to 1000.degree. C. and if x is between 0.05 and 0.20. The gray pigments are formed especially at 1050.degree. to 1200.degree. C. and if x is 0.30 to 0.60.

REFERENCES:
patent: 2273872 (1942-02-01), Kinzie
patent: 4874433 (1989-10-01), Kiss et al.
patent: 4894092 (1990-01-01), Nishihara et al.

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