Preparation of polyhalocopper phthalocyanine pigments of high color strength
AssigneeBASF SE
InventorsJoachim Kranz, Karl Schmeidl
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Abstract
Polyhalocopper phthalocyanine pigments of high color strength are prepared by recrystallizing the finely divided agglomerated crude pigment in a heterogeneous aqueous organic phase at elevated temperatures by a process in which the aqueous organic phase used is a heterogeneous mixture of an aliphatic ketone having a total of 3 to 9 carbon atoms and water. The process gives the pigments in the form of spherical granules which are dust-free or have a low dust content. The pigments give deep, brilliant colorations of pure hues.
Claims15
A process for the preparation of a polyhalocopper phthalocyanine pigment of high color strength by recrystallizing the finely divided agglomerated crude pigment in a heterogeneous aqueous organic phase, which is a mixture of an aliphatic ketone having a total of 3 to 9 carbon atoms and water, at elevated temperatures and isolating the pigment.
A process for the preparation of a polyhalocopper phthalocyanine pigment of high color strength by recrystallizing the finely divided agglomerated crude pigment in a heterogeneous aqueous organic phase, which is a mixture of one or more C.sub.4 -C.sub.7 -alkanones and water, at the boiling point of the mixture to 120.degree. C., the weight ratio of crude pigment to ketone being from 1:0.3 to 1:2, and isolating the pigment.
Dependencies are inferred from the claim text.