Pigment compositions
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United States of America Patent
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-
Feb 6, 1990
Grant Date -
N/A
app pub date -
Dec 19, 1988
filing date -
Dec 21, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pigment which comprises crystallites of iron oxide having an average particle size of less than 100 nanometers doped with from 10% to 80% by weight of aluminium as Al.sup.3+ based on the weight of iron, having the general formula (Al.sub.x Fe.sub.2-x)O.sub.3, where x=0.34 to 1.24 and having an orange color with the following color measurements: L (Lightness)>45.degree. C (Strength)>40.degree. H (Hue) 50.degree. to 60.degree. A pigment precursor composition is also provided which, on firing, produces the pigment as defined above.
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