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Two-component developer, developing device, image forming apparatus, and image forming method

A two-component developer and toner technology, applied in the direction of developer, electric recording process using charge pattern, equipment for electric recording process using charge pattern, etc., can solve the problem of high wax exposure rate and insufficient suppression The adhesion between the toner and the carrier, the high exposure rate of the release agent on the surface of the toner master particle, etc., to achieve the effect of reducing the adhesion

Active Publication Date: 2013-04-24
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, the toner contained in the electrostatic latent image developer disclosed in Japanese Patent Application Laid-Open No. 9-319158 has an excessively high wax exposing rate on the toner surface, and thus cannot sufficiently suppress the temperature rise of the inside of the developing tank. Increased adhesion between toner and carrier
Therefore, the decrease in fluidity of the developer cannot be sufficiently prevented
In addition, in recent years, as the image forming apparatus has been miniaturized and increased in speed, the temperature inside the developing tank has further increased, so the decrease in the fluidity of the developer has become more pronounced.
[0012] The electrostatic image developer disclosed in Japanese Patent Application Laid-Open No. 9-160284 contains a resin-coated carrier with a predetermined volume resistance value and a toner whose wax is a polyethylene wax resin, but it cannot sufficiently reduce the relative toner of the toner. Adhesion to the coating resin material of the carrier
Therefore, when the temperature inside the developing tank rises, the increase in the adhesive force between the toner and the carrier cannot be sufficiently suppressed, and the fluidity of the developer decreases.
[0013] In the toner for electrostatic image development disclosed in Japanese Patent Laid-Open No. 2008-20578, although the presence ratio of the external additive in the part where the release agent is exposed on the surface of the toner mother particle is specified, the release rate of the surface of the toner mother particle is The mold agent exposure rate is too high, so the increase in the adhesion between the toner and the carrier caused by the temperature rise inside the developing tank cannot be sufficiently suppressed
Therefore, the decrease in the fluidity of the developer cannot be sufficiently prevented
In addition, in recent years, as the image forming apparatus has been miniaturized and increased in speed, the temperature inside the developing tank has further increased, so the decrease in the fluidity of the developer has become more pronounced.

Method used

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  • Two-component developer, developing device, image forming apparatus, and image forming method

Examples

Experimental program
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Effect test

Embodiment 1～9

[0277] By combining the toners (1) to (5) with different release agent contents in the range of 3.0 to 8.0% by weight, and the toners in the range of 1.86 to 2.45 g / cm 3 Resin-coated carriers (1) to (4) having different apparent densities within the range of , prepared the two-component developers of Examples 1 to 9. Specifically, the mixing ratio of the toner and the resin-coated carrier was adjusted so that the coating ratio of the toner to the resin-coated carrier was 60%, and mixed for 60 minutes using a roller mill.

Embodiment 10

[0339] The two-component developer of Example 10 was obtained by mixing and stirring under the same conditions as in Example 1 using the toner (6) and the above-mentioned resin-coated carrier (1). Also, as shown in Table 1, the dispersion diameter of the release agent on the surface of the toner contained in the two-component developer of Example 10 was 315 nm.

[0340] Table 5 shows the evaluation results of developer fluidity, fixability, and toner chargeability in Example 5 and Example 10. The evaluation methods of developer fluidity, fixability, and toner chargeability are the same as those in Examples 1 to 9 and Comparative Examples 1 to 21.

[0341]

[0342] As can be seen from Table 5, the two-component developer of Example 5 containing the toner (2) in which the dispersion diameter of the release agent on the surface of the toner is less than 300 nm has excellent developer fluidity, fixability and toner Charging characteristics were also at a level without problems...

Embodiment 11～15

[0345] Using toner (2) and resin-coated carriers (7) to (9) containing carrier cores with a volume average particle diameter in the range of 25 to 50 μm, mixing and stirring were performed under the same conditions as in Example 5 , thus obtaining the two-component developers of Examples 11 to 13.

[0346] Toner (2), resin-coated carrier (10) including a carrier core material with a volume average particle diameter of 23 μm, and resin-coated carrier (11) including a carrier core material with a volume average particle diameter of 52 μm were used , Mixing and stirring were carried out under the same conditions as in Example 5, whereby the two-component developers of Examples 14 and 15 were obtained.

[0347] Table 6 shows the evaluation results of developer fluidity, carrier adhesion, and toner charging characteristics in Examples 5 and 11 to 15. The evaluation methods of developer fluidity, carrier adhesion, and toner charging characteristics are the same as those of Examples...

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PUM

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Abstract

A two-component developer is provided. The two-component developer includes a toner containing a binder resin, a colorant and a release agent, and a resin-coated carrier composed of a carrier core material and a resin coating layer formed on a surface of the carrier core material. The toner has an exposure rate of the release agent on the toner surface of 1.00% or above and 3.07% or below. The carrier core material has an apparent density of 1.86 g / cm3 or more and 2.45 g / cm3 or less. The exposure rate of the release agent of the toner and the apparent density of the carrier core material satisfy the following formula (1): y≰−1.54x+5.93   (1) wherein y represents the exposure rate of the release agent of the toner, and x represents the apparent density of the carrier core material.

Description

technical field [0001] The present invention relates to a two-component developer used in electrophotography for developing and making visible an electrostatic latent image formed on an image carrier, a developing device and an image forming device using the two-component developer, and an image forming method. Background technique [0002] Recently, with the remarkable development of OA (Office Automation) equipment, image forming apparatuses such as copiers, printers, and facsimile apparatuses that perform image forming processing by electrophotography are widely used. [0003] In such an image forming apparatus utilizing electrophotography, in order to form an image, for example, a charging process, an exposure process, a development process, a transfer process, a fixing process, and a cleaning process may be performed. In the charging step, the surface of the photoreceptor as an image carrier is uniformly charged in a dark place. In the exposure process, by projecting t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G9/08G03G9/113G03G15/08G03G15/00
CPCG03G2215/0607G03G9/1131G03G9/0825G03G9/1075G03G9/08782G03G9/1136
Inventor 吉冈伸之加本贵则和田统岩松正
Owner SHARP KK