Patent · US Expired

Tantalum (V) nitride pigment, process for producing it and its use

US6294009A · kind A · utility

9Cited by

4References

15Claims

0Family size

Assignee

dmc.sup.2 Degussa Metals Catalysts Cerdec AG · DE

Inventors

Hans-Peter Letschert · Bonn, DE
Wilfried Voigt · Rodenbach, DE

Key dates

Filing date	Dec 2, 1999
Grant date	Sep 25, 2001
Priority date	—
Expiry date	Dec 2, 2019

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC01P2006/60
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.