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US 2013/0075664 A1Published application
Coloured polymer particles
AssigneeMerck Patent GmbH
InventorsLouise Diane Farrand, Nils Greinert, Mark John Goulding, Mark James, Ashley Nathan Smith, Jonathan Henry Wilson
Life of this patent
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Abstract
This invention relates to coloured polymer particles prepared by a reverse emulsion solvent removal process, electrophoretic fluids comprising such particles, and electrophoretic display devices comprising such fluids.
Claims22
1-18. (canceled)
A process for the preparation of coloured polymer particles for use in electrophoretic devices, comprising the steps of
- a) forming a reverse emulsion comprising optionally at least one polymer, at least one, optionally pre-polymerised, dye, at least one polar solvent, at least one non-polar solvent, and at least one optionally charged surfactant,
- b) removing the polar solvent or polar solvents by evaporative methods and
- c) optionally removing the non-polar solvent or non-polar solvents.
Dependencies are inferred from the claim text.