Yellowish red iron oxide pigments of pure colour, process for preparing them and their use

A colour pure red iron oxide pigment with a yellow cast has a loss on ignition of less than 1 wt.%, a P content of 0.13 to 0.50 wt.% a brightness (L*) of 50 to 60 CIELAB units, a colour variegation (C*) of more than 43.5 CIELAB units and a red contribution (a*) of more than 25 CIELAB units and a yel...

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Bibliographische Detailangaben
Hauptverfasser:	KUNSTMANN, HERBERT, BRUNN, HORST, OEHLERT, WOLFGANG, BUROW, WILFRIED
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ADHESIVES ARTIFICIAL STONE CEMENTS CERAMICS CHEMICAL PAINT OR INK REMOVERS CHEMISTRY COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS COMPOSITIONS BASED THEREON COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F CONCRETE CORRECTING FLUIDS DYES FILLING PASTES IMPREGNATING OR COATING OF PAPER INKS INORGANIC CHEMISTRY LIME, MAGNESIA METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS ORGANIC MACROMOLECULAR COMPOUNDS PAINTS PAPER NOT OTHERWISE PROVIDED FOR PAPER-MAKING PASTES OR SOLIDS FOR COLOURING OR PRINTING POLISHES PREPARATION OF CARBON BLACK PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D PRODUCTION OF CELLULOSE PULP COMPOSITIONS REFRACTORIES SLAG TEXTILES THEIR PREPARATION OR CHEMICAL WORKING-UP TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS,TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES TREATMENT OF NATURAL STONE USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS USE OF MATERIALS THEREFOR WOODSTAINS
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Beschreibung
Zusammenfassung:	A colour pure red iron oxide pigment with a yellow cast has a loss on ignition of less than 1 wt.%, a P content of 0.13 to 0.50 wt.% a brightness (L) of 50 to 60 CIELAB units, a colour variegation (C) of more than 43.5 CIELAB units and a red contribution (a) of more than 25 CIELAB units and a yellow contribution (b) of more than 25 CIELAB units in a barytes pressing. Also claimed is a method of producing such a pigment by first producing magnetite by oxidising Fe with nitrobenzene in an acid medium in the presence of 1000-5000 ppm. P compounds w.r.t. the Fe. The magnetite is then calcined.