Heat resistant yellow pigments, processes for their preparation and their use
AssigneeBayer Aktiengesellschaft
InventorWilfried Burow
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Abstract
Heat resistant iron oxide yellow pigments containing aluminium compounds of the formular (AlO).sub.x PO.sub.4 (OH).sub.x-3 where x is a value from 3 to 10 is prepared by applying the aluminum compund to an iron oxide pigment and is useful as a coloring agent in lacquers and synthetic thermoplastic materials.
Claims12
Heat resistant iron oxide yellow pigments containing aluminium compounds of the formula (AlO).sub.x PO.sub.4 (OH).sub.x-3 where x is a value from 3 to 10.
Process for the preparation of heat resistant iron oxide yellow pigments containing aluminium compounds of the formula (AlO).sub.x PO.sub.4 (OH).sub.x-3 where x is a number from 3 to 10 which process comprises applying said aluminum compounds to an iron oxide yellow pigment by precipitation, hydrothermal synthesis, grinding or spraying of the aluminium compounds on the iron oxide yellow pigment.
Dependencies are inferred from the claim text.