Patent · US Expired

Process for the production of purple pigments

US5707436A · kind A · utility

5Cited by

4References

10Claims

0Family size

Assignee

Cerdec Aktiengesellschaft Keramische Farben · DE

Inventors

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

Key dates

Filing date	Mar 29, 1995
Grant date	Jan 13, 1998
Priority date	—
Expiry date	Mar 29, 2015

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/2993
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

Prior art production of purple pigments based on colloidal gold on stovable/sinterable/fireable support material involves the reduction of a gold compound in the presence of a chemical reducing agent. Purple pigments may be produced more simply according to the invention by intimately mixing and/or grinding the support material and the gold compound in dry form or by bringing an aqueous solution or suspension of a gold compound and a support material into contact and then thermally treating the mixture at a temperature above the decomposition temperature of the gold compound and below the sintering temperature of the support material, wherein the gold compound is converted into colloidal gold.

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