PRODUCTION OF FINELY DIVIDED PIGMENTS

The invention relates to a method for finishing an organic pigment, the pigment being dissolved or dispersed in mineral acid, and from the solution or dispersion the pigment being crystallizable by mixing it with an aqueous diluent in the presence of a condensation product of naphthalene sulfonic ac...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	HENNING RAINER, BEST WOLFGANG, JESSE JOACHIM, SENS BENNO, KLUEGLEIN MATTHIAS, VAN GELDER RICHARD
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
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Beschreibung
Zusammenfassung:	The invention relates to a method for finishing an organic pigment, the pigment being dissolved or dispersed in mineral acid, and from the solution or dispersion the pigment being crystallizable by mixing it with an aqueous diluent in the presence of a condensation product of naphthalene sulfonic acid and at least one aliphatic aldehyde having 1 to 6 carbon atoms as a crystallization modifier, the product containing sulfonate groups, and subsequently the pigment being isolated as solid matter, characterized in that the crystallization modifier is present in the aqueous diluent.