High performance capsule for electrophoretic displaying device

An electrophoretic display and capsule technology, applied in the field of novel non-aqueous capsules, can solve the problems of difficulty in controlling the size distribution of capsules, difficult sealing of strong charge control agents, etc., and achieve the effects of improving switching rate and moisture resistance and reducing manufacturing costs.

Inactive Publication Date: 2004-08-11
SIPIX IMAGING INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Third point, strong charge control agents (CCAs) typically used to enhance electrophoretic mobility or switching rate of electrophoretic displays are usually difficult to be encapsulated (encapsulated) in the dispersed phase
Controlling the capsule size distribution is very difficult and there is no way to remove unwanted capsules once they are formed

Method used

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  • High performance capsule for electrophoretic displaying device
  • High performance capsule for electrophoretic displaying device
  • High performance capsule for electrophoretic displaying device

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0096] Preparation of fluorinated isocyanates as shell-forming species in the internal phase

[0097]

[0098] 12 grams of Krytox-alcohol (g = ~6, molecular weight = ~1200, DuPont) was dissolved in 50 grams of 1,1,2-trichlorotrifluoroethane. Within four hours, the resulting solution was added dropwise with stirring to another refluxing solution containing 5.85 g of Desmodur_N3400 (EW=195 from Bayer), 30 g of 1,1,2-trichlorotri Fluoroethane and 5 grams of α, α, α-trifluorotoluene. Reflux was continued for another 10 hours to complete the reaction. After the solvent was removed, a viscous liquid was obtained. Infrared spectrum shows at 1730cm -1 A peak at , which is characteristic of the urethane groups in the product.

[0099] A series of fluorinated polyfunctional isocyanates were synthesized by the same reaction steps from various fluorinated alcohols, including 1H, 1H, 11H-perfluoro-1-undecanol (Aldrich), Zonyl FSO and FSN (Dupont ) and 2,2,3,3,4,4,5,5-octafluoro-1...

preparation example 2

[0102] Preparation of fluorinated epoxides as shell-forming species in the internal phase

[0103] Fluorinated epoxides can be synthesized according to the following reaction pathways. Fluorolink D (from Ausimont) was treated with an excess of sodium hydride and allyl bromide was added to the resulting mixture to produce a fluorinated diene, which was subsequently oxidized with a peracid to form a fluorinated diepoxide.

[0104]

[0105] Alternatively, multifunctional fluorinated epoxides can be synthesized by reacting multifunctional fluorinated alcohols with epichlorohydrin.

preparation example 3

[0107] Synthesis of Fluorinated Amines as Shell Forming Species in the Internal Phase

[0108]

[0109] 17.8 grams of Krytox-methyl ester (molecular weight = about 1780, g = about 10, from DuPont) was dissolved in a solution containing 12 grams of 1,1,2-trichlorotrifluoroethane (Aldrich) and 1.5 grams of α,α, α-trifluorotoluene (Aldrich) in a solvent mixture. At room temperature, under stirring, the solution obtained was added dropwise into another solution after 2 hours. This solution contained 7.3 g of tris(2-aminoethyl)amine (Aldrich). The mixture was then stirred for an additional 8 hours to complete the reaction. The infrared spectrum of the crude product clearly shows that at 1780cm -1 The C=O vibration of the methyl ester disappears, and at 1695cm -1 The C=O vibration of the amide product occurs at . Solvent was removed by rotary evaporation followed by vacuum stripping at 100°C for 4 to 6 hours. The crude product is then dissolved in 50ml of PFS2 solvent (perf...

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Abstract

The present invention is directed to novel non-aqueous capsules suitable as display cells for an electrophoretic display and the encapsulation process for their manufacture.

Description

technical field [0001] The present invention relates to a novel non-aqueous capsule suitable as a display cell for an electrophoretic display and an encapsulation method for making such a capsule. Background technique [0002] An electrophoretic display is a non-emissive device based on the electrophoresis of charged pigment particles suspended in a solvent. This type of display was first proposed in 1969. Such displays generally consist of two plates with electrodes placed opposite each other and separated by a spacer. Usually, one of the electrode plates is transparent. Between the two electrode plates, a suspension of colored solvent and charged pigment particles is sealed. When a voltage difference is applied between the two electrodes, the pigment particles will migrate to one side, and depending on the polarity of the voltage difference, the color of the pigment or the color of the solvent can be seen. [0003] In order to avoid undesired particle movement, such as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/16G02F1/13357
CPCG02F1/133615Y10T428/2989B01J13/16G02F1/167Y10T428/2991G02F1/16757
Inventor 梁荣昌臧宏玫
Owner SIPIX IMAGING INC
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