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 1037471

PROCESS FOR PREPARING COPPER PHTHALOCYANINE PIGMENTS OF THE .alpha.- MODIFICATION Abstract of the Disclosure: A process for preparing very pure copper phthalocyanine pigments of the .alpha.-modification, wherein substituted or unsub- stituted 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 phthalo- cyanines 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.

188789

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