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US 2003/0188664 A1Published application
Methods for production of pigment dispersion
AssigneeSun Chemical Corporation
InventorsKalpathy R. Anantharaman, Michael L. Lewis, Pat Galioto
Life of this patent
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Abstract
Disclosed is a process for the preparation of a pigment dispersion starting with a tank flushed pigment that is continuously fed into a twin screw extruder, washed and dried by vacuum to get a desirable product.
Claims7
A process for the preparation of a pigment dispersion, said process comprising:
- (a) providing a twin screw extruder which comprises a pair of co-rotating parallel screws, a feed section, a dispersion section and a dehydrating section;
- (b) feeding a tank flushed pigment into said feed section of the twin screw extruder and feeding a hydrophobic liquid organic media into the twin screw extruder;
- (c) continuously flushing pigment particles from a water phase to an organic medium phase, thus forming a flushed pigment mixture;
- and
- (d) transferring said flushed pigment mixture from said flushing section to said dehydrating section and therein continuously dehydrating said mixture by rotation of said pair of screws thereby forming pigment dispersion,
- wherein feeding the hydrophobic liquid organic media is done at any time prior to or after the dehydration of step.
3 more elements
Dependencies are inferred from the claim text.