Process and agent for the production of purple decoration

US5589273A · kind A · utility

Assignee

• Cerdec Aktiengesellschaft Keramische Farben · DE

Inventors

• Bernd Dorbath · Alzenau, DE
• Norbert Giesecke · Bruchköbel, DE
• Klaus-Dieter Fritsche · Leisnig, DE

Key dates

• Filing date: Mar 29, 1995
• Grant date: Dec 31, 1996
• Expiry date: Mar 29, 2015

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2993
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Purple colors based on colloidal gold on stovable substrates and the use thereof for the production of purple decoration on glass, ceramics and porcelain are known. The production of such purple colors is elaborate. Agents according to the invention should be viewed as pigment precursors, wherein the pigment is formed during firing of the decoration. The agents contain a gold compound, with the exception of gold oxide, which may be decomposed to colloidal gold on firing of the decoration and a finely divided glass flux in a weight ratio of gold to glass flux of between 1:10 and 1:2,000. Preferred agents contain HAuCl.sub.4, Au.sub.2 S.sub.3, AuCN or KAu(CN).sub.2 as the gold compound and a lead-free glass frit as the glass flux. The agents may be obtained by grinding the glass flux with a gold compound. Purple decoration is obtained by applying the agent to the substrate to be decorated and storing at 400.degree. to 1,050.degree. C.