Pigmentation of crude metal phthalocyanines

Details Pigmentation of crude metal phthalocyanines Pigmentation of crude metal phthalocyanines

C - Chemistry, Metallurgy

09

B

6/198

C09B 47/04 (2006.01)

Patent

CA 1052058

PIGMENTATION OF CRUDE METAL PHTHALOCYANINES Abstract of the Disclosure A process for the conversion of crude metal phthalocyanines produced by fusion syntheses into pigments having improved tinc- torial strength and transparency is described. The process in- volves mixing the dry crude metal phthalocyanine with 2 to 5 parts of 82 to 86% sulfuric acid per part of pigment in the crude in the absence of shear to form a paste-like mass and then hydro- lyzing the mass under certain conditions using a hot aqueous diluent containing 2 to 15% by weight of pigment in the crude of ammonium hydroxide, tetramethyl ammonium hydroxide or certain amines.

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