PROCESS FOR DEACTIVATING SOLUBLE METAL CATIONS IN IRON OXIDE PIGMENTS

The subject matter of this invention relates to a process for deactivating the soluble metal cations contained in iron oxide pigments comprising A. adding, while oxidizing, an alkalizing compound to an iron oxide pigment, a slurry until the pH of the pigment slurry is greater than 9; and B. separati...

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Bibliographische Detailangaben
Hauptverfasser:	PATIL, ARVIND S, KERSTEN, SIEGFRIED P, FLIEGE, WERNER P
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	ADHESIVES CHEMISTRY DYES METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS PAINTS POLISHES PREPARATION OF CARBON BLACK TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS,TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES
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Beschreibung
Zusammenfassung:	The subject matter of this invention relates to a process for deactivating the soluble metal cations contained in iron oxide pigments comprising A. adding, while oxidizing, an alkalizing compound to an iron oxide pigment, a slurry until the pH of the pigment slurry is greater than 9; and B. separating the iron oxide pigment from the liquid phase of the slurry. The pigments can be used as colorants for substances ingested by man and animals, and they can also be used to stabilize plastics against ultraviolet degradation.