Green decoration coloring substance for high-temperature firing, process for its production and use thereof
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United States of America Patent
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Jun 20, 2000
Grant Date -
N/A
app pub date -
Oct 2, 1998
filing date -
Oct 2, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention makes available for the first time pure green decoration coloring substances for high-temperature firing at least at 1000.degree. C., in particular at 1100 to 1250.degree. C., with a color hue angle h in the range of 160.degree..+-.20.degree.. The decoration coloring substance comprises chromium oxide as the pigment and one or several glass frits as glass flux, and additionally a cobalt compound from the series CoO, Co(OH).sub.2 and Co compounds forming CoO below or at the firing temperature, with the atomic ratio of Co to Cr being in the range of 0.01 to 0.35, preferably 0.15 to 0.25.
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