Process for preparing copper phthalocyanine pigments of the...

Details Process for preparing copper phthalocyanine pigments of the... Process for preparing copper phthalocyanine pigments of the...

C - Chemistry, Metallurgy

09

B

260/199.5

C09B 47/04 (2006.01) C09B 67/16 (2006.01) C09B 67/50 (2006.01)

Patent

CA 1037472

ABSTRACT OF THE DISCLOSURE This invention relates to a process for the preparation of a very pure halogenated copper phthalocyanine pigment of the .alpha.-modification which comprises dissolving crude copper phthalocyanine in a 80 to 86% sulfuric acid isolating the copper phthalocyanine sulfate formed, hydrolizing the sulfate and grinding the copper phthalocyanine thus obtained in an aqueous- organic medium.

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