Electrophoretic dispersion
AssigneeE Ink California, LLC
InventorsYu Li, Hui Du, Yayong Liu, Haiyan Gu, HongMei Zang
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Abstract
The present invention is directed to an electrophoretic dispersion comprising pigment particles dispersed in a solvent or solvent mixture, wherein said pigment particles comprises at least one polymer chain comprising a terminal thiocarbonylthio group, attached to the particle surface. The invention also relates to pigment particles suitable for use in an electrophoretic dispersion and methods for their preparation through a RAFT polymerization technique.
Claims7
An electrophoretic dispersion, comprising polymer coated charged pigment particles dispersed in a hydrocarbon solvent, wherein said polymer coated charged pigment particle comprises polymer chains attached to the particle surface and said polymer chain comprises:
- (a) an outer polymer layer formed from monomers consisting of first monomers, the outer polymer layer is compatible with the hydrocarbon solvent,
- (b) an inner polymer layer formed from monomers consisting of second monomers each comprising a charged functional group to provide charges to the pigment particles, and different from the first monomers, and
- (c) a terminal thiocarbonylthio group attached to the outer polymer layer.
Dependencies are inferred from the claim text.