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Toner and developer

A toner and colorant technology, applied in the field of developer and toner, can solve the problems of inability to obtain the excellent separation ability of toner, insufficient effect, printing paper wrapping around the fixing roller, etc., and achieve excellent low-temperature fixing ability Effect

Inactive Publication Date: 2012-11-21
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although hot offset may not be caused, the use of this toner causes a problem of printing paper wrapping around the fuser roller, and the excellent separation ability of the toner cannot be obtained
In addition, the toner has been improved for heat-resistant storage stability, but its effect is insufficient

Method used

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  • Toner and developer
  • Toner and developer
  • Toner and developer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0366]

[0367] After filtering 100 parts of the dispersion slurry 1 under reduced pressure, the resultant was subjected to a series of the following treatments (1)-(4) twice, thereby producing a filter cake 1:

[0368] (1) Add ion-exchanged water (100 parts) to the filter cake, then use a TK homomixer (10 minutes at 12000 rpm) to mix, and then filter;

[0369] (2) 10% aqueous sodium hydroxide solution (100 parts) was added to the filter cake obtained in (1), followed by mixing using a TK homomixer (at 12000 rpm for 30 minutes), and then filtering under reduced pressure;

[0370] (3) 10% by mass hydrochloric acid (100 parts) was added to the filter cake obtained in (2), followed by mixing using a TK homomixer (10 minutes at 12000 rpm), and then filtering; and

[0371] (4) Ion-exchanged water (300 parts) was added to the filter cake obtained in (3), followed by mixing using a TK homomixer (at 12000 rpm for 10 minutes), followed by filtration.

[0372] Cake 1 was dried at 45°...

Embodiment 2

[0374] Toner 2 of Example 2 was obtained in the same manner as in Example 1, provided that dispersion slurry 2 was used instead of dispersion slurry 1 .

Embodiment 3

[0376] Toner 3 of Example 3 was obtained in the same manner as in Example 1, provided that dispersion slurry 3 was used instead of dispersion slurry 1 .

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Abstract

The invention provides a toner and a developer, the developer comprises a binder resin comprising a crystalline resin and a non-crystalline resin, a colorant, and a release agent, wherein the toner is provided with a flow starting temperature T1 / 2 equal to 1 / 2 of 120 DEG C-135 DEG C, and the ratio of the peak intensity obtained from the crystalline resin and the release agent to the peak intensity obtained from the binder resin via FTIR-ATR measurement is 0.10-0.20.

Description

Background technique [0001] The present invention relates to a toner used in image forming apparatuses such as copiers, facsimiles and printers and a developer containing the toner. Background technique [0002] An electrophotographic or electrostatic recording image forming apparatus conventionally performs image formation by developing an electric latent image or a magnetic latent image with toner. In electrophotography, for example, an electrostatic latent image is formed on a photoconductor, and then the electrostatic latent image is developed with a toner to form a toner image. The toner image is then transferred onto a recording medium such as paper, followed by heating and melting to fix the toner image on the recording medium. [0003] Recently, demands in the market include reducing the particle diameter of the toner to improve the image quality of an output image, and improving the low-temperature fixing ability of the toner to save energy. It is difficult to red...

Claims

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Application Information

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IPC IPC(8): G03G9/08G03G9/087
Inventor 花谷慎也渡边真弘杉本强佐藤智行穗积守
Owner RICOH KK
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