Process for the production of purple pigments
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United States of America Patent
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-
Jan 13, 1998
Grant Date -
N/A
app pub date -
Mar 29, 1995
filing date -
Mar 30, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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