Basf Corporation

Timothy G Leary

Thomas E Donegan

Arvind S Patil

John H Bantjes

Alpha-phase phthalocyanine pigment crystals are produced as substantially 100 percent isometric crystals by first activating a phthalocyanine pigment crude, followed by combining the activated crude with water and a surfactant, whereby a mixture is formed. The mixture is then milled so that a pigment slurry is formed.

Process for making alpha-phase phthalocyanine blue pigment comprising

A process for making an aqueous pigment dispersion comprising substantially 100 percent .beta.-phase, isometric copper phthalocyanine pigment particles is carried out by activating a pigment crude, followed by fine-milling the activated crude in the presence of an emulsion, the fine-milling taking place in a stirring mill. The resulting pigment slurry is then isolated as an aqueous presscake.

Process for making a phthalocyanine pigment dispersion

A process for preparing phthalocyanine pigment which exhibits excellent flow characteristics when dispersed in solvent type inks comprising the steps of

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Grand Haven, MI, United States of America

Timothy G Leary