METHOD OF CONTINUOUSLY FORMING AN AQUEOUS COLORANT DISPERSION USING A SCREW EXTRUDER

A continuous process for making a pigment dispersion includes continuously feeding a pigment into a feed section of a screw extruder at a controlled rate, continuously feeding a surfactant into the feed section of the screw extruder at a controlled rate, continuously feeding water downstream of the...

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Bibliographische Detailangaben
Hauptverfasser:	CHUNG JOO, CHENG CHIEH-MIN, PEARSON JIM LEE, GODSHALL ERIC DAVID, MALACHOWSKI STEVEN M
Format:	Patent
Sprache:	eng
Schlagworte:	CINEMATOGRAPHY ELECTROGRAPHY ELECTROPHOTOGRAPHY HOLOGRAPHY MAGNETOGRAPHY MIXING, e.g. DISSOLVING, EMULSIFYING, DISPERSING PERFORMING OPERATIONS PHOTOGRAPHY PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL PHYSICS TRANSPORTING
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Beschreibung
Zusammenfassung:	A continuous process for making a pigment dispersion includes continuously feeding a pigment into a feed section of a screw extruder at a controlled rate, continuously feeding a surfactant into the feed section of the screw extruder at a controlled rate, continuously feeding water downstream of the feed section to emulsify the pigment and the surfactant, forming a water-in-pigment dispersion, continuously feeding additional water downstream of the previously fed water to cause a phase inversion of the water-in-pigment dispersion, forming a pigment-in-water dispersion, continuously homogenizing the pigment-in-water dispersion in the screw extruder to create a homogenous aqueous pigment dispersion and collecting the homogenous aqueous pigment dispersion from an exit section of the screw extruder.