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Particle used for image display medium, image display panel using same, and image display

An image display and particle technology, applied in instruments, nonlinear optics, optics, etc., can solve the problems of small filling, insufficient color rendering, limited filling of pigments or dyes, etc., and achieve the effect of preventing agglutination and improving durability

Inactive Publication Date: 2007-12-26
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method also has the following problems: the structure used to configure the charge transfer layer and even the charge generation layer becomes complicated, and it is difficult to make the charge overflow stably from the conductive particles, which lacks stability.
However, pulverized particles have the following problems: uneven particle shape, limited filling amount of pigments or dyes, failure to express specified color, and damage such as cracking during pulverization
Aggregated particles have the problem that the filling amount of pigment or dye is smaller and cannot show the specified color
In addition, composite particles have the following problems: since there are no pigments and dyes inside the masterbatch, the color development is insufficient, or the pigments and dyes are easily peeled off from the surface, or the number of manufacturing steps is increased.
[0030] At present, it is impossible to control the chargeability (positive chargeability and negative chargeability) of the particulate matter constituting the image display medium used in the image display device equipped with a flat panel for dry image display. Material intrinsic value

Method used

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  • Particle used for image display medium, image display panel using same, and image display
  • Particle used for image display medium, image display panel using same, and image display
  • Particle used for image display medium, image display panel using same, and image display

Examples

Experimental program
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preparation example Construction

[0246] The powder fluid can be prepared by mixing and pulverizing necessary resins, charge control agents, colorants, and other additives; it can also be polymerized from monomers; it can also be prepared by mixing existing particles with resins, charge control agents, colorants, Other additives are covered. The resin, charge control agent, colorant, and other additives constituting the powder fluid are listed below.

[0247] Examples of resins include polyurethane resins, acrylic resins, polyester resins, polyurethane-modified acrylic resins, silicone resins, nylon resins, epoxy resins, styrene resins, butyral resins, vinylidene chloride resins, melamine resins, Phenolic resin, fluororesin, etc., can also be used in combination of 2 or more types, especially acrylic urethane resin, acrylic urethane silicone resin, acrylic urethane fluororesin, polyurethane resin, fluororesin .

[0248] Examples of charge control agents include quaternary ammonium salt compounds, nigrosine d...

Embodiment 1

[0271]

[0272] Aluminum balls having an average particle diameter of 7.0 μm were used as the center portion as the core. The total reflectance of the surface (corresponding to the interface between the center portion and the outer layer portion) of the used aluminum ball constituting the center portion was 85%. On the above-mentioned aluminum ball as the central part, the conventional white material was coated with Agglomaster (manufactured by HOSOKAWAMICRON Co., Ltd.) to prepare the outer layer part, thereby obtaining the white particles of the present invention.

[0273]The white material was prepared by adding 10 phr of titanium oxide and a charge control agent BONTRON E89 (Orient Chemical ( Co., Ltd.) 2phr, kneading, and then pulverizing and classifying with a jet mill to prepare it.

[0274] The obtained white particles have an average particle diameter of 9.0 μm and a surface charge density of -60 μC / m 2 . In addition, when the luminance ratios of the base white pa...

Embodiment 2

[0275]

[0276] 500 nm of aluminum was vapor-deposited on PMMA balls with an average particle diameter of 5.0 μm, and the resulting particles were used as cores as cores. The total reflectance of the surface (corresponding to the interface between the center portion and the outer layer portion) of the aluminum vapor-deposited film constituting the center portion used was 82%. In the same manner as in Example 1, a conventional white material was coated on the above-mentioned center portion using Agglomaster (manufactured by Hosokawa Micron Co., Ltd.) to prepare an outer layer portion, thereby obtaining white particles of the present invention.

[0277] The obtained white particles have an average particle size of 8.0 μm and a surface charge density of -50 μC / m 2 . In addition, when the luminance ratios of the base white particles and the white particles of the present invention were measured, the luminance ratio of the white particles of the present invention was 4% higher t...

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Abstract

The constitution of particles is improved (first, second, fourth, fifth, sixth, eighth, ninth inventions) which particles are used in an image display wherein an image display medium is sealed between substrates which are opposite to each other and at least one of which is transparent, and an electric filed is applied to the image display medium, thereby moving the image display medium to display an image. The material for such particles is improved (third, seventh, tenth inventions). As a result, the particles and a powder fluid using such particles are improved in the whiteness, prevented from agglomeration, and enables to control electrostatic charge. An image display panel using such particles or a powder fluid as the image display medium has such a durability that the contrast of a displayed image is not lowered after repeated use. Consequently, an image display mounted with this image display panel can display a good image.

Description

technical field [0001] The present invention relates to particles and powder fluids used in reversible image display devices capable of repeatedly displaying images by moving particles or powder fluids by electrostatic force such as Coulomb force, and to flat panels for image display and image display devices using the particles. Background technique [0002] As an image display device replacing a liquid crystal (LCD), an image display device (display) employing techniques such as an electrophoretic method, an electrochromatic display method, a thermal method, and a two-color particle rotation method has been proposed. Compared with LCD, the above-mentioned image display device has advantages such as being able to obtain a large viewing angle close to ordinary printed matter, low power consumption, and having a storage function. , electronic paper and other aspects of the development. [0003] Recently, an electrophoretic method has been proposed in which microcapsules are ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/17G02F1/167
Inventor 加贺纪彦药师寺学田泽晴列增谷真纪小林太一荒井利晃村田和也櫻井良小林米次田村一安西弘行山崎博贵西室阳一町田邦郎
Owner BRIDGESTONE CORP