Novel microencapsulation processes and compositions for electrophoretic displays
AssigneeSiPix Imaging, Inc.
InventorsWenxin Yu, Jing-Den Chen, Chih-Yuan Liao, Haiyan Gu, HongMei Zang, Rong-Chang Liang
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Abstract
The present invention is directed to a method for improving the performance of an electrophoretic display, which method comprises adding a fluorinated quaternary nitrogen salt in either the internal phase or the continuous phase in a microencapsulation process for the formation of pigment-containing microparticles. One or more of the following materials may be further added to the internal phase or continuous phase in the microencapsulation process: a fluorinated protective colloid, a second charge controlling agent or a second monomer or oligomer.
Claims61
A method for improving the particle size and size distribution of electrophoretic microparticles and the performance of an electrophoretic display, which method comprises adding a fluorinated quaternary nitrogen salt into the precursor/internal phase of a process for the formation of the electrophoretic microparticles.
A process for the preparation of electrophoretic microparticles, which process comprises:
- (a) preparing a solution comprising a polymer precursor (“precursor/internal phase” or phase “I”);
- (b) emulsifying the precursor/internal phase into a fluorinated solvent or solvent mixture (“continuous phase” or phase “F”);
- and
- (c) forming electrophoretic microparticles by hardening the emulsion, in which a fluorinated quaternary nitrogen salt is present in phase “I”, phase “F” or both phases “I” and “F”.
An electrophoretic dispersion which comprises electrophoretic microparticles comprising a fluorinated quaternary nitrogen salt.
An electrophoretic display comprising:
- (a) a top layer and a bottom layer, at least one of which is transparent,
- (b) an array of cells sandwiched between the two layers and display cells which are filled with an electrophoretic dispersion comprising electrophoretic microparticles which comprises a fluorinated quaternary nitrogen salt.
Use of a fluorinated quaternary nitrogen salt for improving the yield, particle size and size distribution and the performance of an electrophoretic display.
Dependencies are inferred from the claim text.