Basf Corporation

Basf Wyandotte Corporation

Thomas E Donegan

Timothy G Leary

Arvind S Patil

John H Bantjes

Rodney G Schroeder

Matthew K Wong

John Henry Banties

A polyhalogenated pigment crude is combined with a heterocyclic organic liquid in which the pigment is only 'slightly stable', and the resulting mixture is mixed under high shear conditions to produce a pigmentary product.

Process for conditioning crude polyhalogenated pigments using a

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

Copper phthalocyanine pigments

An apparatus for purifying copper phthalocyanine pigment in a continuous process without the use of acid. This apparatus comprises a container for preparing a slurry of said pigment in water, a pump and a conduit for conducting the slurry from the container to the inlet of the pump, a first heating apparatus capable of heating the slurry to a temperature of at least about 75.degree. C., a conduit for conducting the slurry from the pump to the first heating apparatus, a thin film pressure filter, and a conduit for conducting the slurry from the first heating apparatus to the thin film pressure filter. The apparatus is arranged such that the temperature of the slurry passing through the thin film pressure filter is close to the exit temperature of the slurry from the first heating apparatus. A product outlet is provided for the filter and a control valve is positioned in the product outlet. The apparatus includes structure for washing filter cake comprising a source of wash water, a pump, and a conduit from the source of wash water to the inlet of the pump, heating device, and a conduit for conducting wash water from the outlet of the pump to the heating device. The heating device has sufficient capacity to provide wash water at a temperature approaching that of the slurry entering the filter. A conduit is provided for conducting the wash water from the heating device to the thin film pressure filter. The apparatus also includes control apparatus adapted to control the speed of both motors on both pumps in turn controlling the pressure of the slurry entering the filter and the pressure of the wash water entering the filter.

Apparatus for purifying copper phthalocyanine pigment

In accordance with the instant invention, a high solids phthalocyanine pigment presscake prepared by methods well known to those skilled in the art is fluidized. The fluidization process comprises the steps of mixing the high solids pigment presscake with alkali metal hydroxide or ammonium hydroxide and rosin. In a preffered embodiment, the rosin, is dissolved in the hydroxide or aqueous solution thereof prior to mixing with the presscake.

Fluidized pigment presscake

Copper phthalocyanine blue pigments are produced by

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Holland, MI, United States of America

Thomas E Donegan