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US 10,254,622 B2Granted
Polymer additives used in color electrophoretic display medium
AssigneeE Ink California, LLC
InventorsMing Wang, Hui Du
Life of this patent
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Abstract
An electrophoretic medium may be incorporated into an electrophoretic display that includes a dispersion containing a non-polar fluid, a plurality of first charged colored particles, polyisobutylene, and an additive selected from co-polymers of vinyl aromatics and at least one hydrocarbon having 2 to 5 carbons and at least one double bond. The co-polymer and the ratio of the co-polymer to polyisobutylene is selected, such that bistability performance is maintained while improving the color state performance of the display.
Claims18
An electrophoretic medium comprises:
- (a) a non-polar fluid;
- (b) a plurality of first charged particles;
- (c) polyisobutylene;
- and
- a co-polymer comprising ethylene, propylene, and a vinyl aromatic.
2 more elements
An electrophoretic medium comprising:
- (a) a non-polar fluid;
- (b) a plurality of first charged particles;
- (c) polyisobutylene;
- and
- (d) an additive selected from co-polymers of a vinyl aromatic and at least one substituted or unsubstituted hydrocarbon having 2 to 5 carbons and at least one double bond,
- wherein the combined weight percent of polyisobutylene and additive is 0.1 to 2.5% based on the total weight of the dispersion.
3 more elements
Dependencies are inferred from the claim text.