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Microcapsule for electrophoretic display device, process for manufacturing the same and use thereof

An electrophoretic display and microcapsule technology, which is applied in microcapsule preparations, microsphere preparation, instruments, etc., can solve problems such as contrast reduction, and achieve the effect of inhibiting subsequent contrast reduction.

Inactive Publication Date: 2010-03-24
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, the problem with the existing electrophoretic display elements using microcapsules is that when allowed to stand under high temperature and high humidity conditions, especially when allowed to stand under high temperature and high humidity conditions for a long time (for example, at 60° C., 90% RH for 24 hours), after which a significant drop in contrast was found

Method used

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  • Microcapsule for electrophoretic display device, process for manufacturing the same and use thereof
  • Microcapsule for electrophoretic display device, process for manufacturing the same and use thereof
  • Microcapsule for electrophoretic display device, process for manufacturing the same and use thereof

Examples

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preparation example Construction

[0122] The second method of the present invention for preparing microcapsules for electrophoretic display elements (hereinafter referred to as the second preparation method of the present invention), as described above, comprises causing microcapsules for electrophoretic display elements and ion exchange resins to dissolve in an aqueous medium. Coexisting step (A) is a method as a basic step, wherein the microcapsule includes electrophoretic particles and a solvent, both of which are encapsulated in a shell. In detail, the above-mentioned step (A) is to cause microcapsules for electrophoretic display elements (wherein the microcapsules are obtained by the step of microencapsulating (to be the core substance) dispersion liquid for electrophoretic display elements) and ion exchange resin in an aqueous medium Coexistence steps.

[0123] The second production method of the present invention is not limited except that step (A) is included as a basic step, and all methods (such as v...

Embodiment 1-1

[0204] Into a 300 ml detachable flask, 14.5 g of polyethyleneimine (product name: Epomin SP006 (Mw=600), manufactured by Nippon Shokubai Co., Ltd.) and 43.5 g of water were initially introduced, and after that, the mixture was stirred for 10 minutes. 97.2 g of an aqueous solution of an epoxy compound (lauryl polyoxyethylene (n=22) glycidyl ester, solubility in water: 100%) prepared in advance 97.2 g was added dropwise.

[0205] While maintaining the temperature of the liquid in the flask at 25°C or lower, dropwise addition was performed, stirring was continued for 30 minutes after the addition was complete, and then the temperature was raised to 70°C and kept at this temperature for 2 hours, and it was Cooling to normal temperature afforded compound (A1) having a dispersity of 25% by weight of solid component content.

Embodiment 1-2

[0207] According to the same method as in Synthesis Example 1-1, the difference is that after the initial charge in Synthesis Example 1-1, 130.4 g of 25wt% which had been prepared in advance was added dropwise within 10 minutes under stirring An aqueous solution of an epoxy compound (lauryl polyoxyethylene (n=44) glycidyl ester, solubility in water: 100%) obtained compound (A2) having a dispersity of 25 wt% solid component content.

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Abstract

An object of the present invention is to provide a microcapsule for an electrophoretic display device which can suppress reduction in later contrast even when the electrophoretic display device is allowed to stand under the high temperature and high humidity condition, favorably, under the high temperature and high humidity condition for a long time (e.g. under 60 DEG C., 90% RH for 24 hours). Asa means of achieving this object, a microcapsule according to the present invention for an electrophoretic display device comprises an electrophoretic fine particle and a solvent both of which are encapsulated in a shell, and is characterized in that an amount of an alkaline metal ion in the whole microcapsule is 150 ppm or smaller.

Description

technical field [0001] The present invention relates to a microcapsule for an electrophoretic display element in which electrophoretic fine particles and a solvent are encapsulated in a shell; a production method thereof; and a sheet for an electrophoretic display element using the microcapsule. Background technique [0002] The electrophoretic display element is a non-emissive display element that utilizes the electrophoretic phenomenon of pigment particles in a dispersion liquid in which electrophoretic pigment particles are dispersed in a coloring solvent. More particularly, electrophoretic display elements have heretofore been referred to as elements having a structure in which a dispersion liquid is enclosed in a space provided between opposing electrode substrates (films), at least one of which is The electrode substrates are transparent, and in the structure, voltage is applied to a predetermined position between the two electrode substrates, the electrophoretic parti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/167B01J13/02B01J13/06
Inventor 宮崎淳志松本诚串野光雄菊田照夫伊藤彰男
Owner SEIKO EPSON CORP
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