Magnetic carrier and dual-component developer

A technology of magnetic carrier and charge control agent, which is applied in developer, electrography, optics, etc., can solve the problems of charge reduction, fogging, detachment, etc. Effect

Active Publication Date: 2012-03-21
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the amount of charge decreases due to long-term use, fogging sometimes occurs when an image is formed
This is possible because the charge control agent wears out and detaches during long-term use while the developing unit is repeatedly tribocharged.

Method used

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  • Magnetic carrier and dual-component developer
  • Magnetic carrier and dual-component developer
  • Magnetic carrier and dual-component developer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0283] Toner α (8 parts by mass) was added to Magnetic Carrier A (92 parts by mass). The mixture was vibrated by a V-type mixer for 10 minutes to prepare a two-component developer. The following evaluations were performed by using a two-component developer. The results are shown in Table 6.

[0284] As the image forming apparatus, a digital commercially available printer, image PRESS C1 (manufactured by Cannon Inc.) plus a modified machine, was used. The above developers were placed in the developing unit at the cyan position, images were formed and evaluated. The image forming apparatus is modified as follows. The peripheral speed of the developing sleeve was set up to 1.5 times the peripheral speed of the photosensitive drum, and the discharge port for replenishing the developer was further closed so that only the toner was replenished. Apply an AC voltage to the developing sleeve, that is, a rectangular wave with a frequency of 2.0kHz and a Vpp of 1.3kV and a DC voltage...

Embodiment 2-14

[0320] [Examples 2-14, Comparative Examples 1-6]

[0321] Evaluation was performed in the same manner as in Example 1 except that the toner, magnetic carrier, and toner density of Example 1 were changed to those shown in Table 6. The evaluation results are shown in Table 6.

[0322] [Table 6]

[0323]

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PUM

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Abstract

The invention relates to a magnetic carrier and a dual-component developer comprising the magnetic carrier. The magnetic carrier comprises magnetic carrier particles, each of which has a magnetic carrier core. The surface of each magnetic carrier core is coated with a charge control agent and furthermore with a resin coating including a resin composition.

Description

technical field [0001] The present invention relates to a magnetic carrier and a two-component developer used in electrophotography and electrostatic recording. Background technique [0002] As a magnetic carrier used in a two-component developer, in order to improve the charging characteristics and the durability of the magnetic carrier, it has been used by coating a resin composition on the surface of a ferrite core or a resin core in which a magnetic substance is dispersed formed magnetic carrier. In addition, in order to stabilize charging characteristics after long-term use (operation) or leaving in the environment, a magnetic carrier containing a charge control agent is used. [0003] In Japanese Patent Application Laid-Open H08-160674, a magnetic carrier is described which contains a charge control agent in a coating resin composition and / or on the surface in order to suppress toner consumption to a minimum and obtain A magnetic carrier whose charging characteristic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/107G03G9/10
CPCG03G9/107G03G9/1075G03G9/113G03G9/1135G03G9/1138G03G9/108G03G9/097G03G9/1087G03G9/1131
Inventor 中毅马场善信石上恒
Owner CANON KK
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