Process for preparing copper phthalocyanine pigments of the .alp

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

1978-10-20

1980-09-23

Raymond, Richard

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

8661, C09B 4704

Patent

active

042242223

ABSTRACT:
This invention relates to a process for the preparation of a very pure 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.

REFERENCES:
patent: 2284685 (1942-06-01), Detrick et al.
patent: 2556727 (1951-06-01), Lane et al.
patent: 2602800 (1952-07-01), Barnhart
patent: 3004986 (1961-10-01), Kirby et al.
patent: 3127412 (1964-03-01), Gaertner et al.
patent: 3758321 (1973-09-01), Santimauro et al.
patent: 3775149 (1973-11-01), Langley et al.
Moser et al., Phthalocyanine Compounds, (1963), pp. 153, 154 and 183.

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