Particles for electrophoretic displays
AssigneeMerck Patent GmbH
InventorsLouise Diane Farrand, Jonathan Henry Wilson, Mark James, Christopher Lutz, Nathan Smith, Mark John Goulding
Life of this patent
Estimating the term…
Abstract
This invention relates to 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, electrophoretic displays comprising such particle, and new polymerizable dyes.
Claims18
A coloured polymer particle for use in electrophoretic devices comprising at least one A-B diblock copolymer comprising a hydrophobic polymer block A and a hydrophilic polymer block B containing a charge or being chargeable, and monomer units of at least one monomer, of at least one polymerisable dye, optionally of at least one charged co-monomer, and optionally of at least one crosslinking co-monomer, wherein the A-B diblock copolymer consists of PMMA as block A and PDMAEMA as block B.
A process for the preparation of coloured polymer particles for use in electrophoretic devices, comprising
- a) the reaction of at least one monomer, at least one A-B diblock copolymer consisting of PMMA as block A and PDMAEMA as block B at least one initiator, optionally at least one polymerisable dye, optionally of at least one charged co-monomer, and optionally of at least one crosslinking co-monomer,
- b) optionally colouring the polymer particles by incorporation of at least one dye and/or at least one pre-polymerised dye and/or at least one polymerisable dye, and optionally
- c) washing the polymer particles.
Dependencies are inferred from the claim text.