Charge control agents and particle dispersions including the same
AssigneeE Ink Corporation
InventorsEugene Bzowej, John L Marshall, Stephen J. Telfer, Brandon Macdonald
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Abstract
Mixtures are disclosed containing a plurality of charged pigment particles and a one or more charge control agents. At least one of the charge control agents has a chemical structure that includes a cationic head group, such as an ammonium cation or an iminium compound, and a non-ionic, polar functional group, other than an acyclic secondary amide group. The mixtures are useful as dispersions for forming electrophoretic media that may be incorporated into electrophoretic displays. Alternatively, the dispersions may be useful for forming electrophotographic toners and dispersions for other printing applications.
Claims8
An electro-optic display comprising a light transmissive electrically-conductive layer, a layer comprising a dispersion, and a substrate comprising one or more electrodes, wherein the layer comprising the dispersion is disposed between the light transmissive electrically-conductive layer and the substrate, wherein the light transmissive electrically-conductive layer and the substrate are configured to apply an electric field to the layer comprising the dispersion, and wherein the dispersion comprises a fluid and a mixture comprising a plurality of charged particles, and a first charge control agent, the first charge control agent comprising an ammonium cation and having a chemical structure represented by Formula XVI, or Formula XVII;
- wherein HT of Formula XVI and Formula XVII is a hydrophobic moiety comprising a functional group selected from the group consisting of poly(hydroxystearic acid), poly(ricinoleic acid), and poly(isobutylene), and
- wherein the first charge control agent has a weight average molecular weight greater than 1000 g/mol.
Dependencies are inferred from the claim text.