Patent ID: 8830561

Claim:
An electrophoretic display comprising: (a) microcups comprising partition walls and top-openings; (b) an organic-based electrophoretic fluid filled in the microcups, wherein said fluid comprises charged pigment particles dispersed in a solvent; and (c) a top-sealing layer formed from a sealing composition to enclose the electrophoretic fluid within the microcups, the sealing composition comprising: (i) a water soluble polymer selected from the group consisting of polyvinyl alcohol; polyethylene glycol and its copolymers with polypropylene glycol; poly(vinylpyrolidone) and its copolymers; polysaccharides; gelatin; poly(acrylic acid), its salt forms, and its copolymers; poly(methacrylic acid), its salt forms, and its copolymers; poly(2-dimethylaminoethyl methacrylate); poly(2-ethyl-2-oxazoline); poly(2-vinylpyridine); poly(allylamine); polyacrylamide; polymethacrylamide; and a cationic polymer functionalized with quaternary ammonium groups; (ii) a water-based suspension, a water-based dispersion, a water-based emulsion, or a water-based latex, each comprising a polymer selected from the group consisting of polyurethane, polyacrylate, polyvinyl acetate, polyvinyl chloride, polystyrene, and the copolymer thereof; and (iii) water; wherein the top-sealing layer is on top of, and in contact with, the electrophoretic fluid.