Tantalum (V) nitride pigment, process for producing it and its use
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United States of America Patent
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Sep 25, 2001
Grant Date -
N/A
app pub date -
Dec 2, 1999
filing date -
Dec 17, 1998
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Expired
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Abstract
The invention relates to tantalum (V) nitride pigments with improved color values compared with predisclosed products, a process for producing such pigments and their use. According to the invention, pigments having an a* color value in the CIE Lab system of equal to/greater than 45, in particular equal to/greater than 50, are obtainable by after-treating a tantalum (V) nitride produced in a known manner in a salt melt at 100 to 600.degree. C., in particular 300 to 500.degree. C., in the course of 1 to 100 minutes, in particular 5 to 60 minutes. Preferably, the after treatment is carried out in an alkali-metal nitrate melt. The pigments can be used to color plastics and paints, and also enamel, glass and porcelain decorations.
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