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AssigneeE Ink Corporation
InventorsCharles H. Honeyman, Elizabeth A. Moran, Libing Zhang, Anthony Edward Pullen, Emily J. Pratt, Kimberly L. Houde, Matthew A. King, Craig A. Herb, Richard J. Paolini, Jr.
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In electrophoretic media, it is advantageous to use pigment particles having about 1 to 15 percent by weight of a polymer chemically bonded to, or cross-linked around, the pigment particles. The polymer desirably has a branched chain structure with side chains extending from a main chain. Charged or chargeable groups can be incorporated into the polymer or can be bonded to the particles separately from the polymer. The polymer-coated particles can be prepared by first attaching a polymerizable or polymerization-initiating group to the particle and then reacting the particle with one or more polymerizable monomers or oligomers.
An electrophoretic medium comprising a plurality of pigment particles suspended in a suspending fluid, the pigment particles having from about 1 to about 15 percent by weight of the pigment of a polymer chemically bonded to, or cross-linked around, the pigment particles.
An electrophoretic medium comprising a plurality of carbon black particles suspended in a suspending fluid, said particles having from about 1 to about 25 percent by weight of the carbon black of a polymer chemically bonded to, or cross-linked around, the carbon black particles.
An electrophoretic medium comprising a plurality of pigment particles suspended in a suspending fluid, the pigment particles having from about 4 to about 15 percent by weight of the pigment of a polymer chemically bonded to, or cross-linked around, the pigment particles, the polymer comprising a main chain and a plurality of side chains extending from the main chain, each of the side chains comprising at least about four carbon atoms.
A two-phase electrophoretic medium comprising a continuous phase and a discontinuous phase, the continuous phase comprising at least about 40 percent by volume of the electrophoretic medium, the discontinuous phase comprising a plurality of droplets, each of which comprises a suspending fluid and at least one pigment particle disposed within the suspending fluid and capable of moving through the fluid upon application of an electric field to the electrophoretic medium, the continuous phase surrounding and encapsulating the discontinuous phase, the pigment particle comprising a polymer chemically bonded to, or cross-linked around, the pigment particle.
A pigment particle for use in an electrophoretic medium, the pigment particle having a polymer chemically bonded to, or cross-linked around, the pigment particle, the pigment particle also having a charged or chargeable group bonded to the pigment particle separately from the polymer.
Dependencies are inferred from the claim text.