Anticorrosive pigments on the basis of tertiary alkaline-earth aluminum phosphates and a process for the production thereof
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United States of America Patent
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Oct 27, 1992
Grant Date -
N/A
app pub date -
Sep 14, 1990
filing date -
Jul 3, 1990
priority date (Note) -
Expired
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Abstract
The present invention provides anticorrosive pigments on the basis of tertiary alkaline-earth aluminum phosphates, particularly those where the numerical atomic ratio x:y:z of formula AE.sub.x Al.sub.y (PO.sub.4).sub.z of alkaline earth to aluminum to phosphorus or phosphate is 50-70% to 5-30% to 20-50%. It also provides a process for their production in which an alkaline-earth compound and aluminum compound sufficiently soluble with phosphoric acid are reacted with phosphoric acid, the precipitated pigment is filtered off as usual and dried, optionally calcined and optionally ground.
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