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Fine electretic particles and process for producing same

A manufacturing method and electret technology, applied in nonlinear optics, instruments, optics, etc., can solve the problems of insufficient electrophoresis, uneven charging, etc., and achieve the effect of excellent electrophoresis

Inactive Publication Date: 2014-12-24
SAKURA COLOR PRODUCTS CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, various conventional electret particles have the problem of uneven charging and insufficient electrophoretic properties.
In addition, when the electret fine particles tend to aggregate in the electrophoretic medium, there is also a problem that the electrophoretic properties become insufficient.

Method used

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  • Fine electretic particles and process for producing same
  • Fine electretic particles and process for producing same
  • Fine electretic particles and process for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5 and comparative example 1～5

[0185] The following materials were prepared as raw materials of electret fine particles. The detailed composition is shown in Table 1.

[0186] A.VT470 (fluororesin: raw material for housing part)

[0187] B. Dispersion-enhancing resin (= polymer dispersant, 3 types shown in Table 1)

[0188] C. Urethane resin ball

[0189] D. Acrylic ball

[0190] E.PVA224 (raw material of emulsifier)

[0191] Electret fine particles were prepared by the following procedure.

[0192] The fluororesin VT470 was dissolved in ethyl acetate at 5%, and the dispersibility-enhancing resin was dissolved in ethyl acetate at 2%. The resin balls of C and D were respectively mixed into this solution and stirred.

[0193] An emulsifier was prepared by dissolving PVA224 at 5% in ion-exchanged water. Measure 200 g of the resin ball mixture, and stir at a speed of 2000 rpm in a homomixer. 50 g of the above-mentioned emulsifier was added to the mixed liquid under stirring, and it was stirred at a rota...

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Abstract

Fine electretic particles in which at least the surface part comprises an electretic resin and a polymeric dispersant, wherein the electretic resin is a fluororesin and has been converted to an electret by irradiation with electron beams or radiation or by a corona discharge. The fine particles have even chargeability and show satisfactory dispersibility in electrophoresis media and excellent electrophoretic properties.

Description

technical field [0001] The present invention relates to an electret fine particle useful as a phoretic particle used in a full-color electrophoretic display device (ie, electronic paper) and a method for producing the same. Background technique [0002] In recent years, an electrophoretic display method using electrophoresis of charged particles (electret particles) has been considered as an optimal technology for next-generation display devices. However, there are many issues such as the shape of charged particles, small and unstable charged potential (ζ potential), secondary aggregation and precipitation of migrating particles, erasure of the last displayed image, and insufficient response speed, and research and development are ongoing. [0003] Patent Documents 1 and 2 disclose electret particles used for the aforementioned applications. [0004] Patent Document 1 describes "a negatively charged particle, which is characterized in that an electron trap is added to the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/167C08J3/12C08J3/28G02F1/17
CPCC08J3/28G02F1/172C08J3/126C08J2333/12C08J2375/04C08J2427/16G02F1/167C08J3/12G02F1/0018G02F2001/1678
Inventor 清江龙一井上浩
Owner SAKURA COLOR PRODUCTS CORPORATION
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