Transparent iron oxide pigments
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United States of America Patent
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Oct 21, 1986
Grant Date -
N/A
app pub date -
Oct 4, 1984
filing date -
Oct 4, 1984
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to a process for preparing transparent iron oxide pigments comprising reacting an iron compound, an ammonia releasing compound and water in a non-aqueous solvent in which both the iron compound and the ammonia-releasing compound have appreciable solubility. The reaction is performed by refluxing this composition. Where a red pigment is desired, a high boiling alcohol may be employed whereby the refluxing is carried out above 200.degree. C. which thus converts the pigment to a red iron oxide pigment during the reflux step. In order to get a metallic finish, aluminum flake pigment may be added to a mixture of the iron compound and solvent prior to addition of the ammonia-releasing salt.
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