Continuous process for preparing pigment flush
AssigneeSun Chemical Corporation
InventorGeorge H. Robertson
Life of this patent
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Abstract
A process for continuous flush of a pigment press cake involves applying a dispersant to the press cake to produce a fluidized press cake, continuously feeding the fluidized press cake into a twin screw extruder and mixing it with a neutralizing agent in the extruder, mixing the neutralized press cake with a liquid organic medium in the extruder to produce an organic flush phase and a water phase, and removing at least part of the water phase from the extruder through one or more parts of the extruder.
Claims20
A process for preparing a flush from a pigment press cake, comprising the steps of:
- (a) introducing an aqueous fluidized press cake comprising a press cake and a dispersant, a dispersant neutralizing agent and a liquid organic medium into an extruder;
- (b) mixing the fluidized press cake, neutralizing agent and liquid organic medium in the extruder to produce a pigment flush phase and a water phase;
- and (c) removing at least part of the water phase from the extruder.
A process of preparing an ink composition, comprising the steps of:
- (a) applying a dispersant to a pigment press cake to produce an aqueous fluidized press cake;
- (b) continuously feeding fluidized press cake to a twin screw extruder;
- (c) mixing the fluidized press cake with a dispersant neutralizing agent in the extruder to produce an organic flush phase and a water phase;
- (d) removing water phase from the extruder to produce a pigment flush;
- and (e) mixing the pigment flush with at least one additional material to produce an ink composition.
Dependencies are inferred from the claim text.