Developer and test method thereof

A technology of developer and color developer, applied in the direction of developer, copying/marking method, investigation stage/state change, etc., can solve problems such as time-consuming

Inactive Publication Date: 2014-03-26
TOSHIBA TEC KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, as described above, it takes too much time to decolo

Method used

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  • Developer and test method thereof
  • Developer and test method thereof
  • Developer and test method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] The binder resin microparticle dispersion, the colorant microcapsule dispersion, and the mold release agent microparticle dispersion were prepared so that the colorant concentration became 15%, the release agent concentration became 10%, and the binder resin concentration became 75%. Ammonium sulfate was used as a coagulant to produce 8 μm aggregated particles, which were melted by heating to 60° C., and then cooled to obtain a colored particle dispersion. The obtained colored particle dispersion was separated from solid to liquid by a filter press, and the colored particles were washed with pure water and vacuum-dried. As additives, 2 parts by weight of hydrophobic silica and 0.5 parts by weight of titanium oxide were attached to On the surface of the toner particles, a colored toner of 8 μm was obtained.

[0056] The obtained toner was mixed with a ferrite carrier covered with silicone resin, and image output was performed on an MFP (e-studio4520c) manufactured by Toshi...

Embodiment 2

[0063] A colored toner of 8 μm was obtained in the same manner as in Example 1 except that the colorant microcapsule dispersion was changed to a colorant dispersion.

[0064] The obtained toner was stored in a freezer at -30° C. for one week to obtain a colored toner.

[0065] The obtained toner was mixed with a ferrite carrier covered with silicone resin, and image output was performed on an MFP (e-studio4520c) manufactured by Toshiba Tec. The temperature of the fixing device was set to 80° C., the paper feed speed was adjusted to 30 mm / sec, and a color developed image with an image density of 0.4 was obtained.

[0066] In the DSC measurement of the obtained toner, as in Example 1, in the first heating, endothermic peaks were observed at around 65°C, 80°C, and 100°C, and in the second heating, at 60°C A baseline shift due to the glass transition of the binder resin was observed nearby, an endothermic peak was observed around 80°C, and the endothermic peak around 100°C disapp...

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Abstract

The invention provides a color-fadable developer capable of rapidly fading the colors of an image and the test method thereof. The color-fadable developer contains a binder resin, a color generation compound and a color developing agent. When the developer is heated from a low temperature to a high temperature at a prescribed temperature rising speed, differential scanning calorimetry is detected. The operation is repeated twice. A first differential scanning calorimetry curve based on a measurement by differential scanning calorimetry during the first heating has an endothermic peak that is missing from a second differential scanning calorimetry curve based on a measurement differential scanning calorimetry during the second heating, and has a different peak than the endothermic peak caused by a glass transition point of a binder resin.

Description

technical field [0001] Embodiments of the present invention relate to a developer and an inspection method thereof. Background technique [0002] From the viewpoint of environmental protection or economic efficiency by reducing the usage of recording media such as paper, a method of reusing the recording media such as paper by erasing the color of a toner image formed on recording media such as paper is very effective. [0003] The erasable toner is known to contain, for example, a color-forming compound and a color developer, and to be erasable by heating. In this technology, a color-forming compound and a color developer are melt-kneaded together with a binder resin by a kneading and pulverizing method, and then incorporated into the toner. This toner can decolorize the printed portion by heating the printed paper at 100° C. to 200° C. for about 1 to 3 hours, and the decolorized paper can be reused. Such an erasable toner is an excellent technology that can contribute t...

Claims

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Application Information

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IPC IPC(8): G03G9/087
CPCB41M7/0009G01N25/04B41M5/305G01N25/00G03G9/0924G03G9/0926G03G9/0928
Inventor 原誉史生田真大伊藤刚司宇土基成武田和久青木孝安
Owner TOSHIBA TEC KK
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