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US 9,115,464 B2Granted
Particles for electrophoretic displays
AssigneeMerck Patent GmbH
InventorsNils Greinert, Louise Diane Farrand, Mark James, Ashley Nathan Smith, Mark John Goulding, Daniel Walker, Safyan Khan, Paul Reynolds, Susan Hawkins, Roy Hughes
Life of this patent
Estimating the term…
Abstract
This invention relates to colored polymer particles preferably with surface functionality for charge retention, a process for their preparation, the use of these particles for the preparation of an electrophoretic device, color electrophoretic displays comprising such particle, and new water-soluble dyes.
Claims23
A process for the preparation of coloured polymer particles for use in electrophoretic devices, comprising
- a) reacting at least one polymerisable dye, at least one monomer, optionally at least one steric stabiliser, at least one initiator, and optionally at least one charged co-monomer in a non-aqueous solvent to obtain coloured polymer particles, and further optionally
- b) washing the resulting coloured polymer particles.
A compound of formula 1
- wherein R1, R2 and R3=alkyl,
- R4=H or CH3
- A−=halogen or a monobasic acid (oxo) anion.
A compound of formula 3
- wherein R7=alkyl,
- R8=H or CH3.
Dependencies are inferred from the claim text.