Abstract: The present invention provides uniformly electrified electret fine particles having excellent electrophoretic properties. Specifically, the present invention provides a core-shell electret fine particle comprising a core part and a shell part, the core part containing a material that has an ability to disperse a pigment therein, the shell part containing an electret resin, and the electret resin being a fluorine-containing resin and being electretized by electron ray irradiation, radial ray irradiation, or corona discharge treatment.

Abstract: The present invention provides a process for producing electret fine particles or coarse powder that can be uniformly electrified and exhibits excellent electrophoretic properties. Specifically, the present invention relates to the production processes (1) and (2) below: (1) A process for producing electret fine particles, comprising emulsifying a fluorine-containing material that contains a vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene terpolymer in a liquid that is incompatible with the fluorine-containing material to obtain emulsified particles; and subjecting the emulsified particles to electron ray irradiation, radial ray irradiation, or corona discharge treatment.

Abstract: The present invention provides a process for producing electret fine particles or coarse powder that can be uniformly electrified and exhibits excellent electrophoretic properties. Specifically, the present invention relates to the production processes (1) and (2) below: (1) A process for producing electret fine particles, comprising emulsifying a fluorine-containing material that contains a vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene terpolymer in a liquid that is incompatible with the fluorine-containing material to obtain emulsified particles; and subjecting the emulsified particles to electron ray irradiation, radial ray irradiation, or corona discharge treatment.

Abstract: The present invention provides a process for producing electret fine particles or coarse powder that can be uniformly electrified and exhibits excellent electrophoretic properties. Specifically, the present invention relates to the production processes (1) and (2) below: (1) A process for producing electret fine particles, comprising emulsifying a fluorine-containing material that contains a vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene terpolymer in a liquid that is incompatible with the fluorine-containing material to obtain emulsified particles; and subjecting the emulsified particles to electron ray irradiation, radial ray irradiation, or corona discharge treatment.

Abstract: The present invention provides uniformly electrified electret fine particles having excellent electrophoretic properties. Specifically, the present invention provides a core-shell electret fine particle comprising a core part and a shell part, the core part containing a material that has an ability to disperse a pigment therein, the shell part containing an electret resin, and the electret resin being a fluorine-containing resin and being electretized by electron ray irradiation, radial ray irradiation, or corona discharge treatment.

Abstract: Provided is an electrophoretic display device that can be more easily produced. The electrophoretic display device with pixels comprises a substrate, a plurality of pixel electrode units formed for each pixel on the substrate, a voltage applying means for applying a voltage to each pixel electrode unit, and a charged particle-containing chamber containing colored charged particles and disposed so as to extend across the plurality of pixel electrode units; each of the pixel electrode units having a first electrode disposed in the center of a pixel, and a second electrode disposed on the peripheral edge of the pixel.

Abstract: The present invention provides a process for producing electret fine particles or coarse powder that can be uniformly electrified and exhibits excellent electrophoretic properties. Specifically, the present invention relates to the production processes (1) and (2) below: (1) A process for producing electret fine particles, comprising emulsifying a fluorine-containing material that contains a vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene terpolymer in a liquid that is incompatible with the fluorine-containing material to obtain emulsified particles; and subjecting the emulsified particles to electron ray irradiation, radial ray irradiation, or corona discharge treatment.

Abstract: Provided is an electrophoretic display device that can display high-precision color images. The electrophoretic display device comprises a plurality of display units each displaying a single pixel, first electrodes, and second electrodes; the display units being arranged in a matrix form and each having at least three-layered cells that contain charged particles, each of the first electrodes being provided on the upper or lower surface of each cell, each of the second electrodes being provided on the side edge of each cell, and the charged particles being colored with different colors for every cell in each display unit.

Abstract: The invention provides a dual color ink composition which comprises: (a) at least one pigment selected from a pearlescent pigment and a metal powder pigment; (b) water; (c) at least one water-soluble organic solvent selected from alcohols, glycols and glycol ethers, any of which have a branched hydrophobic group; (d) a water-soluble dye; and (e) a modified starch as a water-soluble fixing agent.

Abstract: The invention provides a dual color ink composition which comprises: (a) at least one pigment selected from a pearlescent pigment and a metal powder pigment; (b) water; (c) at least one water-soluble organic solvent selected from alcohols, glycols and glycol ethers, any of which have a branched hydrophobic group; (d) a water-soluble dye; and (e) a modified starch as a water-soluble fixing agent.