Purple pigments, a process for their production and use thereof

US5252522A · kind A · utility

Assignee

• Degussa AG · DE

Inventors

• Bernd Dorbath · Alzenau, DE
• Karl-Anton Starz · Rodenbach, DE
• Werner Voelker · Bad Vilbel, DE
• Wilan Jerke · Bad Vilbel, DE
• Kai Dorer · Heusenstamm, DE

Key dates

• Filing date: Feb 28, 1992
• Grant date: Oct 12, 1993
• Expiry date: Feb 28, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2004/84
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Purple pigments based on glass frits having an average particle diameter (D.sub.50 value) of 0.5 to 50 .mu.m, of which the surface has a coating of essentially 0.05 to 5% by weight, based on the pigment, of colloidal gold and, if desired, color-modifying metals from the group consisting of Ag, Cu, Co, Ni, Sn, Ru, Rh, Pd, Os, Ir and Pt in a total quantity below that of the gold. The purple pigments do not require the hitherto necessary calcination step and can be used for pigmenting glazes, enamels, glass colors, decorative colors, plastics, printing inks and lacquers.