Anticorrosive pigments on the basis of tertiary alkaline-earth aluminum phosphates and a process for the production thereof

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.

Dependencies are inferred from the claim text.