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Fine electret particles and process for producing same
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一种体性、驻极的技术，应用在驻极体性微粒及其制备领域，能够解决电泳性不充分、带电性不均匀等问题
Inactive Publication Date: 2014-01-15
SAKURA COLOR PRODUCTS CORPORATION
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Problems solved by technology
[0006] However, various conventional electret particles have non-uniform chargeability, and there is a technical problem of insufficient electrophoretic properties.
Method used
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Embodiment 1
[0154] As an electret fine particle raw material, it prepared as follows.
[0155] A.ZEFFLE GK-510 (nuclear part capable of dispersing pigments)
[0156] B. Pigment
[0157] C. Zirconia beads 0.3 (pigment crushing medium)
[0158] D.VT470 ethyl acetate solution (shell raw material)
[0159] E. Desmodur L75 (curing agent for the core part)
[0160] F.PVA224 5% aqueous solution (emulsifier)
[0161] Electret fine particles were prepared by the following procedure.
[0162] (1) Weigh A and B, put them into a beaker, and stir in a dissolver. Stirring conditions were set at 500 rpm x 30 minutes.
[0163] (2) Weigh C and put it into (1), and set the stirring condition to 2000rpm×1 hour.
[0164] (3) The beads were removed by filtering (2) with 250 meshes to obtain a pigment dispersion.
[0165] (4) Weigh (3) and D, and perform dissolver stirring in a separately prepared beaker. Stirring conditions were set at 700 rpm for 30 minutes.
[0166] (5) Weigh E and put it into (...
Embodiment 2
[0174] Electret fine particles were prepared in the same manner as in Example 1, except that components A and E were changed to the following.
[0175] A. Methyl methacrylate monomer (nuclear part capable of dispersing pigments)
[0176] E. Azobisisobutyronitrile (polymerization initiator of the core part)
Embodiment 3
[0178] Electret fine particles were prepared in the same manner as in Example 1, except that components A and E were changed to the following.
[0179] A.JER828 (nuclear raw material capable of dispersing pigments)
[0180] E.JER Cure ST11 (curing agent for core part)
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Abstract
The present invention provides fine electret particles which have been evenly charged and show excellent electrophoretic properties. The particles are core-shell type fine electret particles each comprising a core part and a shell part, and are characterized in that the core part contains a material in which pigments can be dispersed and the shell part comprises an electret resin, which is a fluororesin and has been brought into an electret state by irradiation with electron beams, irradiation with radiation, or a corona discharge.
Description
technical field [0001] The present invention relates to electret microparticles useful as electrophoretic particles used in full-color electrophoretic display devices (so-called electronic paper) and a method for producing the same. Background technique [0002] In recent years, the electrophoretic display method using electrophoresis of charged particles (electret particles) has been considered as the most suitable technology for next-generation display devices. However, there are many technical problems such as the shape of charged particles, small and unstable charged potential (ζ potential), secondary aggregation or precipitation of swimming particles, erasure of historical display images, or insufficient response speed, and research and development are ongoing. . [0003] Patent Documents 1 and 2 disclose electret particles used for the above applications. [0004] In Patent Document 1, it is described that "a negatively charged particle is characterized in that it is...
Claims
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