Compositions: coating or plastic – Materials or ingredients – Pigment – filler – or aggregate compositions – e.g. – stone,...
Patent
1995-08-21
1998-06-16
Marcheschi, Michael
Compositions: coating or plastic
Materials or ingredients
Pigment, filler, or aggregate compositions, e.g., stone,...
106401, 106425, 106426, 106428, 106430, 106431, 106436, 106438, 106439, 106440, 106441, 106442, 106444, 106446, 106449, 106450, 106451, 106453, 106454, 106456, 106459, 106457, 106461, 106467, 106466, 106479, 106480, 106482, 106483, 423400, 423409, 423263, 423385, C09C 100, B01B 2120
Patent
active
057663360
ABSTRACT:
Colored pigments are provided from the green-yellow to red spectrum based on oxide-nitrides with two or three different cations Q, R and S in the crystal lattice, wherein the nitrogen to oxygen atomic ratio is determinative for the color. These pigments crystallise in the pyrochlore, spinel or elpasolite structure. Pigments in the perovskite are as provided with increased color brilliance. The color of the pigments can be adjusted in a wide range of the color spectrum during their preparation within a substance class with the cations Q, R and S and while retaining the crystal structure, by increasing or lowering the atomic ratio N to O in the oxide-nitride and bringing about the required charge balancing by replacing an equivalent quantity of the cation Q with the valency q by a cation R with the valency q+1. In order to prepare the pigments, a mixture of oxide-nitride-forming metal compounds in the atomic ratio of the cations according to the structural formula is calcined, preferably in the presence of mineralizers, under nitriding conditions at 700.degree.-1250.degree. C.
REFERENCES:
patent: 4734390 (1988-03-01), Marchand et al.
patent: 5439660 (1995-08-01), Jansen et al.
Pors et al., Journal of Solid State Chemistry, vol. 107 (1) pp. 39-42 (1993) (no month).
Marchand et al., Annales de Chimie, vol. 16 No. 7 (1991) pp.553-560 (no month).
Hellwig et al., Journal of Materials Science, vol. 29, No. 18 15 Sep. 1994.
Jansen Martin
Letschert Hans-Peter
Cerdec Aktiengesellschaft Keramische Farben
Marcheschi Michael
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