Polymeric-coated dielectric particles and formulation and method for preparing same
First Claim
1. An electrophoretic suspension comprising a plurality of pigment particles having a pre-determined density and suspended in a fluid medium, wherein the pigment particles are coated with polypentafluorostyrene having substantially the same density as the pigment particles.
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Accused Products
Abstract
Properly-coated pigment particles for use in an electrophoretic display include pigment particles having a pre-determined density and application of a polymeric coating to the pigment particles, wherein the coating comprises a near fluoropolymer, and wherein the density of the fluoropolymer is substantially the same as the density of the pigment particles. When a polymeric coating is applied having a density that is substantially the same as the density of the pigment particles, even though the particles comprise a distribution of particle sizes, the density of the pigment particles is not significantly altered. In a preferred embodiment, the pigment particle comprises a diarylide yellow pigment, having a density of 1.43 g/ml, coated with a polymer made from the monomer 2,3,4,5,6-Pentafluorostyrene, having a density of 1.41 g/ml.
181 Citations
19 Claims
- 1. An electrophoretic suspension comprising a plurality of pigment particles having a pre-determined density and suspended in a fluid medium, wherein the pigment particles are coated with polypentafluorostyrene having substantially the same density as the pigment particles.
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7. A formulation for coating pigment particles with polypentafluorostyrene for use in an electrophoretic device, comprising a mixture of:
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(a) a plurality of pigment particles having a certain predetermined density; (b) a radical polymerization initiator; (c) a pentafluorostyrene monomer having a density substantially equal to the density of the pigment particles; and (d) an organic solvent. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A method of coating pigment particles with polypentafluorostyrene for use in an electrophoretic device, comprising the steps of:
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(a) combining a mixture of a plurality of pigment particles having a predetermined density;
a radical polymerization initiator;
a pentafluorostyrene monomer having a density substantially equal to the density of the pigment particles; and
an organic solvent; and(b) heating and tumbling the mixture of step (a) such that the pentafluorostyrene monomer is polymerized and coats the pigment particles. - View Dependent Claims (16, 17, 18, 19)
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Specification