Inventors:
Charles Honeyman - Roslindale MA, US
Elizabeth Moran - Somerville MA, US
Libing Zhang - Sharon MA, US
Anthony Pullen - Belmont MA, US
Emily Pratt - Portsmouth NH, US
Kimberly Houde - Bethesda MD, US
Matthew King - Marina del Rey CA, US
Craig Herb - Medford MA, US
Richard Paolini - Framingham MA, US
Assignee:
E INK CORPORATION - Cambridge MA
International Classification:
B05D 7/00
Abstract:
In electrophoretic media, it is advantageous to use pigment particles having about 1 to 15 per cent 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.