PRODUCTION OF HALOGENATED COPPER PHTHALOCYANINE PIGMENT FOR GRAVURE PRINTING INK

摘要

PURPOSE:To obtain the titled pigment having high coloring value and giving an ink having excellent fluidity, by adding a beta-naphthol compound to a halogenated copper phthalocyanine pigment, and kneading the mixture with a kneader in the presence of water under heating. CONSTITUTION:Crude halogenated copper phthalocyanine prepared by the halogenation of copper phthalocyanine is mixed with beta-naphthol. The mixture is kneaded with a kneader in the presence of water under heating to obtain the objective pigment. The kneading is carried out preferably at 90-110 deg.C under normal or positive pressure for 2-5hr. The ratio of the halogenated copper phthalocyanine pigment to the beta-naphthol is preferably 100:30-100.