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Microcapsule magnetophoretic display capable of being eliminated from surface

A technology of microcapsules and displays, applied in the fields of instruments, nonlinear optics, optics, etc., can solve the problems of time-consuming, inability to eliminate only the magnetic recording display body, etc., and achieve the effects of excellent safety, excellent contrast, and high shielding power.

Pending Publication Date: 2020-12-29
NIPPON KAPUSERU PURODAKUTSU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such an erasing operation is labor-intensive, and it is impossible to erase only a part of the magnetic recording display body.

Method used

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  • Microcapsule magnetophoretic display capable of being eliminated from surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] 〔Compounding of the microcapsule internal dispersion liquid〕

[0056] Dispersion medium (naphthenic base oil) 68.8% by weight

[0057] Surfactant (sorbitan trioleate) 3.7% by weight

[0058] Hard ferrite particles (barium ferrite, average particle size 0.8 μm) 0.9% by weight

[0059] Magnetite (average particle diameter 0.2 μm) 1.6% by weight

[0060] Light-reflective nonmagnetic particles (titanium dioxide) 20.8% by weight

[0061] Anti-sedimentation agent (hydrophobized silica nanoparticles) 1.7% by weight

[0062] Additives (antioxidants, defoamers, etc.) 2.5% by weight

[0063] The above-mentioned microcapsule inner-package dispersion is prepared by the known complex coacervation method into gelatin-coated microcapsules with an average particle size of 200 μm, cured with a known curing agent, and classified with 297 μm and 45 μm mesh sieves to obtain 45-297 μm microcapsules.

[0064] The obtained microcapsule slurry was dehydrated, a known resin emulsion was ad...

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Abstract

The present invention addresses the problem of providing a microcapsule magnetophoretic display that can be erased from the surface, has excellent erasability and contrast, and can be made thinner with excellent durability, safety, and image quality. In a microcapsule magnetophoretic display capable of being erased from the surface, two or more of magnetite particles having an average particle diameter of 0.5 [mu]m or less and hard ferrite particles having an average particle diameter of 1.0 [mu]m or less are used as light-absorbing magnetic particles in combination, and the microcapsule magnetophoretic display capable of being erased from the surface is characterized in that a dispersion liquid in which two components, i.e., light-absorbing magnetic particles and light-reflecting non-magnetic particles, are dispersed in an oily dispersion medium is sealed in microcapsules, the dispersion liquid is arranged on a substrate, and the positions of the two components in the dispersion medium are moved in the microcapsules by a magnetic field applied from the outside of the substrate. A magnetic recording display such as a black character or image is displayed or erased on a white color.

Description

technical field [0001] The present invention relates to microcapsule magnetophoretic displays capable of being erased from surfaces. Background technique [0002] Microcapsule magnetophoretic displays are known to be commercialized after Patent Document 1. A microcapsule magnetophoretic display is a type of writing tool in which two components, light-absorbing magnetic particles and light-reflecting non-magnetic particles, and additives are dispersed in an oily dispersion medium and encapsulated in microcapsules. The liquid is arranged on the substrate, and the two components in the dispersion medium move their positions in the microcapsules by the magnetic field applied from the outside of the substrate, and the magnetic recording display body that displays or erases black characters or images on white. [0003] In the microcapsule magnetophoretic display, erasing of the magnetic recording display material displayed on the surface is generally performed by sliding a magnet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1673G02F1/16757
CPCG02F1/1673G02F1/16757
Inventor 菅野靖行
Owner NIPPON KAPUSERU PURODAKUTSU
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