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Magnetic carrier and two-component developer

A technology of magnetic carrier and magnetic substance, applied in developing agent, electro-recording technique, optics, etc., can solve problems such as inability to improve developing performance

Inactive Publication Date: 2015-04-22
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As described, if the resistance of the core increases, the development performance at low electric field strength cannot be improved

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0259] Next, the present invention will be described more specifically by means of preparation examples and examples below, which shall not be construed as limiting the present invention.

[0260] [Preparation of Magnetic Substance 1]

[0261] Fe 2+ (1.5 mol / L) ferrous sulfate aqueous solution (26.7L) and containing Si 4+ (0.2 mol / L) sodium silicate (No.3) aqueous solution (1.0 L) was added to 3.4 mol / L sodium hydroxide aqueous solution (22.3 L), the pH was controlled to 6.8 and the temperature was raised to 90°C. Furthermore, a 3.5 mol / L sodium hydroxide aqueous solution (1.2 L) was added, and the pH was controlled to be 8.5. Stirring was continued and air was supplied at a rate of 100 L / min for 90 minutes instead of gas. The mixed solution was neutralized to pH 7 with dilute sulfuric acid. The resulting particles were washed with water, filtered, dried and pulverized to obtain magnetite, ie, magnetic substance 1 .

[0262] Magnetic substance 1 (spherical magnetite, numb...

preparation example

[0315] ・Polyester resin 1:80 parts by mass

[0316] ・Polyester resin 2: 20 parts by mass

[0317] · Paraffin (melting point: 75°C): 7 parts by mass

[0318] Cyan pigment (C.I. Pigment Blue 15:3): 7 parts by mass

[0319] 3,5-di-tert-butylbutyl salicylate aluminum compound: 1 part by mass

[0320] The above-mentioned materials were mixed well by a Henschel mixer (FM-75 type, manufactured by Nippon Coke Engineering Co., Ltd.) and passed through a biaxial kneader (PCM-30 type, manufactured by IKEGAI) set at a temperature of 130° C. kneading. The obtained kneaded product was cooled, and coarsely pulverized by a hammer mill into particles having a size of 1 mm or less to obtain a crude product. The obtained crude product was finely pulverized by a collision jet mill using high-pressure gas.

[0321] Next, the obtained finely pulverized product was classified by a wind classifier (Elbow-jet, LABO EJ-L3, manufactured by Nittetsu Mining Co., Ltd.) using the Coanda effect to simul...

Embodiment 1

[0335] To Magnetic Carrier 1 (92 parts by mass), Toner 1 (8 parts by mass) was added. The mixture was stirred by a V-shaped mixer (V-20, manufactured by Seishin Enterprise Co., Ltd.), whereby a two-component system developer shown in Table 5 was obtained.

[0336] Using a modified machine of image RUNNER ADVANCE C5030, a multifunction machine for digital office manufactured by Cannon Inc., as an image forming apparatus, a two-component system developer was supplied to a developing apparatus for cyan, and toner 1 was supplied to Refill bottle for cyan. Images were formed and evaluated as follows. Note that the image forming apparatus operates by combining a rectangular AC voltage (frequency is 8.0 kHz, Vpp is 0.7 kV) and a DC voltage V DC Applied to the developer carrying member and reformed by closing the developer discharge port of the developing container. When evaluating images after long-term repeated use, control the DC voltage V of the developer carrying member DC , ...

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Abstract

Provided is a magnetic carrier satisfying leakage, white spots, charging property and high developing performance in a low electric field and having excellent durability. The magnetic carrier is a magnetic carrier comprising a magnetic substance-dispersed resin carrier core containing a magnetic substance and a binder resin, and a coating resin on a surface thereof, wherein the magnetic substance comprises a magnetic substance A having a shape without vertexes and a magnetic substance B having a shape with vertexes, the magnetic substance B has a number average particle diameter of 0.40-2.00 μm, and in a reflection electron image of a section of the magnetic substance-dispersed resin carrier core taken by a scanning electron microscope, an area proportion of the magnetic substance B is larger than an area proportion of the magnetic substance A within a region from the surface of the magnetic substance-dispersed resin carrier core to a depth of 1.0 μm.

Description

technical field [0001] The present invention relates to a magnetic carrier used in an image forming method for developing an electrostatic charge image by using electrophotography and a two-component system developer using the magnetic carrier. Background technique [0002] In a conventional electrophotographic system image forming method generally employed, an electrostatic latent image is formed on a latent electrostatic image bearing member by using various methods, and toner adheres to the latent electrostatic image, thereby developing the image. . When the image is developed, carrier particles called magnetic carriers are mixed with the toner, thereby triboelectrically charging the toner. In this way, an appropriate amount of positive or negative charge is imparted to the toner. Toner develops by using electric charge as a driving force. This is a two-component development system that has been widely used. [0003] In the two-component developing system, the functio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/107G03G9/113
CPCG03G9/107G03G9/1075G03G9/1133G03G9/113G03G9/1135G03G9/1136G03G9/1137G03G9/108G03G9/10884
Inventor 马场善信石上恒浜雅之釜江健太郎川上宏明
Owner CANON KK