Compositions: coating or plastic – Materials or ingredients – Pigment – filler – or aggregate compositions – e.g. – stone,...
Patent
1994-11-10
1996-10-29
Bell, Mark L.
Compositions: coating or plastic
Materials or ingredients
Pigment, filler, or aggregate compositions, e.g., stone,...
106400, C04B 3558
Patent
active
055693229
ABSTRACT:
An improved method for producing tantalum (V) nitride by means of nitriding an oxidic tantalum (V) compound is described. The Ta.sub.3 N.sub.5 product obtained in accordance with this method may be used as a red coloring pigment, particularly for coloring plastics and varnishes. An improved color intensity can be achieved and/or the reaction time can be shortened using the process in accordance with the invention. The process includes nitriding tantalum (V) hydrated oxide with the composition of the formula Ta.sub.2 O.sub.5. aq with a hydrate content (i.e., aq content) in a range of 14 to 17% by weight. The nitridation preferably takes place in the presence of a fluxing agent such as ammonium carbonate or boric acid.
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G. Brauer and J. R. Weidlein, "Synthesis and Properties of Red Tantalum Nitride Ta.sub.3 N.sub.5", Angew. Chem. Internat. Edit., vol. 4, No. 3 (1965) pp. 241-242 (no month).
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Jansen Martin
Letschert Hans-Peter
Speer Dietrich
Bell Mark L.
Degussa - Aktiengesellschaft
Hertzog Scott L.
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