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

1973-12-21

1976-10-05

Randolph, John D.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

8 7, 8 62, 106 23, 260 37P, 428457, C09B 4708

Patent

active

039844331

ABSTRACT:
A process for preparing very pure copper phthalocyanine pigments of the .alpha.-modification, wherein substituted or unsubstituted copper phthalocyanines having different degrees of purity are converted into copper phthalocyanine salts capable of being isolated, with the aid of suitable acids which dissolve the impurities contained in the dyestuff, wherein these salts are separated from the acid, the copper phthalocyanines of the .alpha.-modification are set free in a pure form from the copper phthalocyanine salts by the action of water and wherein the isolated copper phthalocyanine is subject in an aqueous suspension to a mechanical fine division. This process yields copper phthalocyanines of the .alpha.-modification in a very pure form without causing problems with respect to the waste water.

REFERENCES:
patent: 2284685 (1942-06-01), Detrick et al.
patent: 2602800 (1952-07-01), Barnhart
patent: 3252991 (1966-05-01), Schmidt et al.
patent: 3717493 (1973-02-01), Griswold
Fiat Report 1313, p. 303, (Feb. 1948).

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