FREMGANGSMAADE TIL FREMSTILLING AF ALFA-KOBBERPHTHALOCYANIN

FREMGANGSMAADE TIL FREMSTILLING AF ALFA-KOBBERPHTHALOCYANIN

A process for the purification of optionally substituted crude phthalocyanines wherein a phthalocyanine is introduced into a 84 to 88 % sulfuric acid, the phthalocyanine sulfate formed is subjected to a crystal growth at 60 - 100 DEG C in an inert gas atmosphere, the phthalocyanine sulfate is isolat...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: SCHIESSLER S, TRONICH W, SPIETSCHKA E
Format: Patent
Sprache:dan
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:A process for the purification of optionally substituted crude phthalocyanines wherein a phthalocyanine is introduced into a 84 to 88 % sulfuric acid, the phthalocyanine sulfate formed is subjected to a crystal growth at 60 - 100 DEG C in an inert gas atmosphere, the phthalocyanine sulfate is isolated and the phthalocyanine is recovered by hydrolysis with water. By this process a phthalocyanine sulfate is formed in a coarse crystalline form which can easily be filtered and which furtheron can easily be processed to a valuable pigment of the alpha -modification.