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US 8,462,423 B2Granted
Coloured particles for electrophoretic displays
AssigneeMerck Patent GmbH
InventorsLouise Diane Farrand, Ashley Nathan Smith, Mark James, Jonathan Henry Wilson, Daniel Walker
Life of this patent
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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, and to color electrophoretic displays comprising such particles.
Claims15
A process for the preparation of coloured polymer particles for use in electrophoretic devices, comprising the steps of
- a) preparing polymer particles, comprising sites of charging and/or of stabilisation,
- b) colouring the polymer particles by incorporation of at least one pre-polymerised dye, and
- c) washing and drying the coloured polymer particles.
Coloured polymer particles comprising a polymeric framework and at least one pre-polymerised dye.
Dependencies are inferred from the claim text.