Flint Ink Corporation

Flint Group Incorporated

Norman E Pratt

Christopher M Teeley

David Kassin

Douglas L Cochran

Christopher B Palmer

Douglas P Gebler

Wayne L Cook

A method for preparing an organic pigment dispersion, such as a flush pigment or ink product, comprises steps of introducing into a twin screw extruder a stable, water-borne pigment dispersion, an organic medium, and a destabilizing agent; mixing together the stable, water-borne pigment dispersion, the organic medium, and the destabilizing agent to produce a pigment flush phase and a water phase; and removing at least a part of the water phase. A twin-screw extruder for carrying out the flushing method has an addition and flushing zone, a water removal zone, and a zone for rinsing the crude organic pigment dispersion or flush with water and removing the rinse water. Additional materials may be added to form a finished pigmented product such as an ink product, masterbatch, or toner.

Processes for preparing organic pigment dispersions and ink

Process for manufacturing pigments

Growing community of inventors

Northville, MI, United States of America

Norman E Pratt