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AssigneeFlint Group
InventorsChristopher M. Teeley, David Kassin, Douglas L. Cochran, Christopher B. Palmer, Norman E. Pratt
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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.
A method for preparing a flush pigment or ink product, comprising steps of introducing into a twin screw extruder a stable, water-borne pigment dispersion, an organic medium, and a destabilizing agent, wherein the stable, water-borne pigment dispersion has a pigment content of at least about 25% by weight;
A method for preparing an organic pigment dispersion or pigmented product, comprising steps of
A method for preparing a flush pigment or ink product, comprising steps of introducing into a twin screw extruder a stable, water-borne pigment dispersion, an organic medium, and a destabilizing agent, wherein the stable, water-borne pigment dispersion is stabilized by an ionic dispersant, and the destabilizing agent is an ionic agent;
A method for preparing an organic pigment dispersion or pigmented product, comprising steps of
Dependencies are inferred from the claim text.