Process for producing polyhalogenated phthalocyanine.

摘要

A process for producing a polyhalogenated phthalocyanine containing not more than 0.02 part by weight of water-insoluble inorganic impurities derived from aluminum chloride per 100 parts by weight of phthalocyanine before halogenation, which process comprises; (A) halogenating phthalocyanine in titanium tetrachloride in the presence of aluminum chloride, (B) heating the halogenation reaction mixture from step (A) to evaporate titanium tetrachloride and sublime aluminum chloride thereby recovering a mixture of aluminum chloride with titanium tetrachloride and obtaining a polyhalogenated phthalocyanine, and (C) recycling to step (A) the mixture from step (B) or aluminum chloride isolated therefrom. o