PROCESS FOR PREPARING A SUBSTANTIALLY PURE GAMMA PHASE QUINACRIDONE PIGMENT OF LARGE PARTICLE SIZE

PROCESS FOR PREPARING A SUBSTANTIALLY PURE GAMMA PHASE QUINACRIDONE PIGMENT OF LARGE PARTICLE SIZE

An improved process for producing a substantially pure gamma phase a quinacridone pigment or pigment derivative involving preparing an aqueous slurry of a crude quinacridone in the presence of caustic alkali and a non-polar, water immiscible solvent; and heating said slurry at a temperature above ab...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: VELASQUEZ, HUMBERTO, A, SUNG, EDWARD, H, ROBERTSON, GEORGE, H
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
ADHESIVES
CHEMISTRY
DYES
HETEROCYCLIC COMPOUNDS
LAKES
METALLURGY
MISCELLANEOUS APPLICATIONS OF MATERIALS
MISCELLANEOUS COMPOSITIONS
MORDANTS
NATURAL RESINS
ORGANIC CHEMISTRY
ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES
PAINTS
POLISHES
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Beschreibung
Zusammenfassung:An improved process for producing a substantially pure gamma phase a quinacridone pigment or pigment derivative involving preparing an aqueous slurry of a crude quinacridone in the presence of caustic alkali and a non-polar, water immiscible solvent; and heating said slurry at a temperature above about 120° C.