Magnetic carrier, two-component developer, and replenishment developer

A technology of magnetic carrier and developer, applied in the direction of developer, instrument, optics, etc., can solve the problems of reduction of charged parts, change of color tone, harmfulness, etc., to reduce toner scattering, stabilize image density, and realize fogging. Effect

Pending Publication Date: 2022-07-29
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In recent years, due to technical progress in the field of electrophotography, the long life of the main body is required to be higher, and the carrier is required to maintain the charge-imparting ability even in long-term use, but it is generally known that the charge-imparting ability of the carrier is due to the reduction of charged sites caused by the attachment of toner components, and harmful effects such as changes in color tone occur in images

Method used

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  • Magnetic carrier, two-component developer, and replenishment developer
  • Magnetic carrier, two-component developer, and replenishment developer
  • Magnetic carrier, two-component developer, and replenishment developer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0417] To 91 parts by mass of Magnetic Carrier 1, 9 parts by mass of Toner 1 was added, and the mixture was shaken with a vibrator (Model YS-8D: manufactured by Yayoi Co., Ltd.), and 300 g of Two-Component Developer 1 was prepared. The amplitude condition of the vibrator was 2 minutes at 150 rpm.

[0418] On the other hand, 90 parts by mass of Toner 1 was added to 10 parts by mass of Magnetic Carrier 1, and the mixture was mixed with a V-type mixer for 5 minutes in an environment of room temperature and normal humidity at 23° C. and 50% RH, and obtained Supplementary developer 1.

[0419] Two-component developer 1 and replenishment developer 1 were used for the following evaluations.

[0420] As the image forming apparatus, a modification of a color copier imageRUNNER ADVANCE C5560 manufactured by Canon Marketing Japan Inc. was used.

[0421] Two-component developers were charged into developing devices for each color, and a replenishing developer container in which the repl...

Embodiment 2 to 33 and comparative example 1 to 7

[0462] Two-component developers 2 to 40 and a developer for replenishment were prepared in the same manner as in Example 1 except that Magnetic Carrier 1 in Example 1 was changed to Magnetic Carriers 2 to 40 as shown in Table 4, respectively 2 to 40; and similar evaluations (1) to (4) were performed.

[0463] The results obtained are shown in Table 5.

[0464] [Table 4]

[0465] Example or Comparative Example two-component developer Supplementary developer toner magnetic carrier Example 1 1 1 1 1 Example 2 2 2 1 2 Example 3 3 3 1 3 Example 4 4 4 1 4 Example 5 5 5 1 5 Example 6 6 6 1 6 Example 7 7 7 1 7 Example 8 8 8 1 8 Example 9 9 9 1 9 Example 10 10 10 1 10 Example 11 11 11 1 11 Example 12 12 12 1 12 Example 13 13 13 1 13 Example 14 14 14 1 14 Example 15 15 15 1 15 Example 16 16 16 1 16 Example 17 17 17 1 1...

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Abstract

The invention relates to a magnetic carrier, a two-component developer, and a replenishment developer. A magnetic carrier comprising: a magnetic core; and a coating resin coating a surface of the magnetic core, wherein the coating resin includes a resin A and a resin B; the content of the resin A is 1-50 mass% and the content of the resin B is 50-99 mass% with respect to the coating resin; the resin A has a specific unit Y1 and a specific unit Y2, and the resin B contains 0.1 mass% or less of the specific unit Y2; and when the mass of the resin A is represented by X, the mass of the unit Y1 is represented by a, and the mass of the unit Y2 is represented by b, 0.90 < = (a + b) / X < = 1.00 and 1.00 < = a / b < = 30.0 are satisfied, and 0 < = SPa-SPb < = 2.0 is also satisfied.

Description

technical field [0001] The present disclosure relates to a magnetic carrier, a two-component developer, and a replenishing developer used in an image forming method for visualizing an electrostatic charge image using an electrophotographic method. Background technique [0002] In general, among electrophotographic image forming methods, methods including forming an electrostatic latent image on an electrostatic latent image carrier using various units, attaching toner to the electrostatic latent image, and developing the electrostatic latent image are generally used. At the time of this development, there are widely adopted methods including mixing carrier particles called magnetic carriers with the toner, triboelectrically charging the toner to impart an appropriate amount of positive or negative charge to the toner, and using the charge as a driving force while using the charge as a driving force. A two-component development method that develops toner. [0003] The two-co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/083G03G9/087
CPCG03G9/083G03G9/0837G03G9/08702G03G9/1133G03G9/1131G03G9/108G03G9/1136G03G9/1085
Inventor 村山隆二小野崎裕斗吉田宜弘皆川浩范
Owner CANON KK
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