Processes for preparing organic pigment dispersions and ink

Details Processes for preparing organic pigment dispersions and ink Processes for preparing organic pigment dispersions and ink

2011-05-24

2011-05-24

Green, Anthony J (Department: 1731)

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

C106S031600, C106S504000, C523S160000, C523S161000, C366S349000

Reexamination Certificate

active

07947126

ABSTRACT:
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.

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Derwent Abstract of Patent Families, Dialog-Internet, Sep. 25, 2000, 27 pages.

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