COMPOSITE PIGMENTS AND PROCESS FOR PREPARING THE SAME

Organic-inorganic ternary composite pigments consisting of 70% - 90% by weight of an inorganic binary titanium dioxide/aluminium hydroxide component and from 10% to 30% by weight of a co-precipitated organic component consisting of an organic azoic dye, containing in its structure at least one carbo...

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Bibliographische Detailangaben
Hauptverfasser:	PAFFONI, CAMILLO, CARLINI, FILIPPO MARIA, BOTTACCIO, GIORGIO, OSTI, ALBERTO
Format:	Patent
Sprache:	eng
Schlagworte:	ADHESIVES CHEMISTRY DYES LAKES METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS MORDANTS NATURAL RESINS ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES 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:	Organic-inorganic ternary composite pigments consisting of 70% - 90% by weight of an inorganic binary titanium dioxide/aluminium hydroxide component and from 10% to 30% by weight of a co-precipitated organic component consisting of an organic azoic dye, containing in its structure at least one carboxylic and/or sulphonic acid function having formula: wherein: R1 is NO2,-SO3H, or -COOH; R2 is NO2, -SO3H, alkyl, or alkoxyl; R3 is H, halogen, or alkyl; R4 and R5 are each H, halogen, alkyl, or alkoxyl; R6 is H, halogen, or alkoxyl; and wherein the -COOH and/or -SO3H group of dye (I) is salified with metal cations. The pigments are obtained by co-precipitation, acidifying an aqueous solution and/or dispersion of acid dye (I) in sodium aluminate, in the presence of TiO2, maintained at 40-80 DEG C and at pH 9.5 - 10.5, followed by treatment with an aqueous solution of a salt of an alkaline-earth metal or of Al, Mn, Zn.