Eutectic process for preparing polychloro copper phthalocyanine

Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal

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C09B 4710

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040353834

ABSTRACT:
Improved eutectic process for preparing polychloro copper phthalocyanine by chlorinating copper phthalocyanine in a reaction medium of molten inorganic metal halide and contacting the reaction medium with an aqueous medium to precipitate the polychloro copper phthalocyanine, wherein the improvement resides in adding a reducing agent to the reaction medium after the completion of the chlorination or to the aqueous medium prior to contact with the reaction medium. The improved process provides a highly chlorinated polychloro copper phthalocyanine which is substantially free of tetrachlorophthalimide impurity. The resulting polychloro copper phthalocyanine is a pure green compound useful as a high quality pigment for a variety of applications.

REFERENCES:
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patent: 2253560 (1941-08-01), Detrick et al.
patent: 2662085 (1953-12-01), Holtzman et al.
patent: 2782208 (1957-02-01), Brooks
patent: 2793214 (1957-05-01), Holtzman et al.
patent: 2837279 (1959-02-01), Randall et al.

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