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US Patent 6958848 Capsules, materials for use therein and electrophoretic media and displays containing such capsules

Patent 6958848 was granted and assigned to E Ink Corporation on October, 2005 by the United States Patent and Trademark Office.

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Patent abstract

An encapsulation material, intended for use in encapsulated electrophoretic displays, comprises the coacervation product of a polyanionic polymer having a vinyl main chain and a plurality of anionic groups bonded to the main chain, with a cationic or zwitterionic water-soluble polymer capable of forming an immiscible second phase on contact with the polyanionic polymer.

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