Preparation of copper phthalocyanine pigments of the beta-modification
First Claim
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1. A process for preparing a strong, transparent and readily dispersible copper phthalocyanine pigment of the β
- -modification consisting of grinding crude copper phthalocyanine in the absence of any grinding aids in the presence of from 1 to 10% by weight, based on the crude pigment, an organic liquid selected from the group consisting of di-C1 -C12 -alkyl phthalate, N-methylpyrrolidone, diethylene glycol, butoxyethanol, phenoxyethanol, ethylene glycol acetate, ethylene glycol diacetate and mixtures thereof, at from 90°
to 140°
C., and then recrystallizing the mill base in an aqueous organic phase.
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Abstract
Strong, transparent and readily dispersible copper phthalocyanine pigments are obtained by grinding the crude pigment in the presence of from 1 to 10% by weight (based on the crude pigment) of an organic liquid at from 90° to 140° C., the pigment forms obtained giving printing inks with very good flow characteristics.
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4 Claims
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1. A process for preparing a strong, transparent and readily dispersible copper phthalocyanine pigment of the β
- -modification consisting of grinding crude copper phthalocyanine in the absence of any grinding aids in the presence of from 1 to 10% by weight, based on the crude pigment, an organic liquid selected from the group consisting of di-C1 -C12 -alkyl phthalate, N-methylpyrrolidone, diethylene glycol, butoxyethanol, phenoxyethanol, ethylene glycol acetate, ethylene glycol diacetate and mixtures thereof, at from 90°
to 140°
C., and then recrystallizing the mill base in an aqueous organic phase. - View Dependent Claims (2, 3, 4)
- -modification consisting of grinding crude copper phthalocyanine in the absence of any grinding aids in the presence of from 1 to 10% by weight, based on the crude pigment, an organic liquid selected from the group consisting of di-C1 -C12 -alkyl phthalate, N-methylpyrrolidone, diethylene glycol, butoxyethanol, phenoxyethanol, ethylene glycol acetate, ethylene glycol diacetate and mixtures thereof, at from 90°
Specification