Organosulfur gold compounds, a process for their production and their use
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United States of America Patent
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Feb 24, 1998
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N/A
app pub date -
Jan 28, 1997
filing date -
Feb 21, 1994
priority date (Note) -
Expired
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Abstract
Various organosulfur gold compounds and their use for the production of gold decorations are known. The invention relates to new organosulfur gold compounds, to a process for their production and to their use for the production of preparations for producing a gold decoration on firing-resistant substrates. The gold compounds according to the invention are obtainable from monogold (I) dimercaptosuccinic acid and compounds of similar structure by dissolution thereof in water in the presence of a base and precipitation by acidification and, if desired, repetition of the dissolving and precipitating steps. The gold compounds according to the invention are characterized by a gold content of 60 to 90% by weight, an atomic ratio of greater than 0.7 to 4. Preferred gold compounds are soluble in water and are suitable as a constituent of organic/aqueous and exclusively aqueous bright and burnished gold preparations for the decoration of glass, porcelain and ceramic.
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