Polymer additives used in color electrophoretic display medium
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G02F-001/167
G02F-001/1675
출원번호
US-0893747
(2018-02-12)
등록번호
US-10254622
(2019-04-09)
발명자
/ 주소
Wang, Ming
Du, Hui
출원인 / 주소
E INK CALIFORNIA, LLC
대리인 / 주소
Baronian, Antranig
인용정보
피인용 횟수 :
0인용 특허 :
110
초록▼
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 t
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.
대표청구항▼
1. An electrophoretic medium comprises: (a) a non-polar fluid;(b) a plurality of first charged particles;(c) polyisobutylene; anda co-polymer comprising ethylene, propylene, and a vinyl aromatic. 2. The electrophoretic medium of claim 1, wherein the vinyl aromatic is selected from the group consisti
1. An electrophoretic medium comprises: (a) a non-polar fluid;(b) a plurality of first charged particles;(c) polyisobutylene; anda co-polymer comprising ethylene, propylene, and a vinyl aromatic. 2. The electrophoretic medium of claim 1, wherein the vinyl aromatic is selected from the group consisting of styrene, alpha-methyl styrene, 2-methyl styrene, 3-methyl styrene, 4-methyl styrene, 44-butyl styrene, 4-cyclohexyl styrene, 4-dodecyl styrene, 2,4-diisopropyl styrene, 2,4,6-trimethyl styrene, 2-ethyl-4-benzyl styrene, 4-(phenyl butyl)styrene, 1-vinyl naphthalene, 2-vinyl naphthalene, vinyl anthracene, 4-methoxy styrene, monochlorostyrene, dichlorostyrene, divinyl benzene, indene, methyl indene, and combinations thereof. 3. The electrophoretic medium of claim 1, wherein the vinyl aromatic comprises styrene. 4. The electrophoretic medium of claim 1, wherein the weight percent of the vinyl aromatic in the copolymer is 20% to 40%. 5. The electrophoretic medium of claim 1, wherein the weight ratio of polyisobutylene to co-polymer in the dispersion is 1:5 to 5:1. 6. The electrophoretic medium of claim 1, wherein the first charged particles are red, green, blue, cyan, yellow, or magenta. 7. The electrophoretic medium of claim 6 further comprising a plurality of second charged particles dispersed in the non-polar fluid. 8. The electrophoretic medium of claim 7, wherein the second charged particles are white or black. 9. The electrophoretic medium of claim 8, wherein the second charged particles are white and the first and second charged particles have opposite charge polarities. 10. The electrophoretic medium of claim 9, wherein the second charged particles comprise titania. 11. The electrophoretic medium of claim 9 further comprising a plurality of third charged particles dispersed in the non-polar fluid. 12. The electrophoretic medium of claim 11, wherein the third charged particles are black and the first and third charged particles have the same charge polarity. 13. The electrophoretic medium of claim 12, wherein the third charged particles comprise, carbon black or copper chromite. 14. The electrophoretic medium of claim 1, further comprising an ionic surfactant. 15. 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. 16. The electrophoretic medium of claim 15, wherein the combined weight percent of polyisobutylene and additive is 0.5 to 1% based on the total weight of the dispersion. 17. The electrophoretic medium of claim 1, further comprising a plurality of second charged particles and a plurality of third charged particles dispersed in the non-polar fluid, wherein the first, second, or third charged particles are red, green, blue, cyan, yellow, magenta, white, or black. 18. The electrophoretic medium of claim 1, wherein the non-polar fluid comprises C6-C18 branched alkanes.
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