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Electrophotographic developer carrier core material, manufacturing method therefor, electrophotographic developer carrier, and electrophotographic developer

A carrier core material, electrophotography technology, applied in the direction of developer, electrography, instrument, etc., can solve the problem of consumption and achieve the effect of preventing the reduction of image quality

Active Publication Date: 2012-05-23
DOWA ELECTRONICS MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, toner particles are supplied and consumed during development and are often replaced with new toner particles, whereas carrier particles remain in the developing machine and are used repeatedly

Method used

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  • Electrophotographic developer carrier core material, manufacturing method therefor, electrophotographic developer carrier, and electrophotographic developer
  • Electrophotographic developer carrier core material, manufacturing method therefor, electrophotographic developer carrier, and electrophotographic developer
  • Electrophotographic developer carrier core material, manufacturing method therefor, electrophotographic developer carrier, and electrophotographic developer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0120] As a raw material, ready to be crushed into an average particle size D 50 Fe of about 1.8 μm 2 o 3 , and was crushed into an average particle size D 50 MgO, Mn of about 1 μm 3 o 4 , P (red phosphorus manufactured by Phosphorus Chemical Co., Ltd.) powder. The raw materials are respectively Fe 2 o 3 : 71.2% by mass, Mn 3 o 4 : 23.7% by mass and MgO: 5.1% by mass were mixed. P powder according to relative to Fe 2 o 3 , MgO, Mn 3 o 4 The amount of mixed raw material powder was weighed in an amount of 0.25% by mass in conversion of P element.

[0121] On the other hand, Sannopco Co., Ltd. product "SN wet 980" added with 1.0% by mass of polycarboxylate ammonium dispersant as a dispersant and 0.05% by mass as a wetting agent in water as a dispersion medium, and 0.02% by mass as The liquid (medium liquid) of the polyvinyl alcohol of the binder.

[0122] Put P powder into the medium liquid, after fully dispersed, put in the above-mentioned weighing Fe 2 o 3 , Mg...

Embodiment 2

[0127] According to relative to Fe 2 o 3 , MgO, Mn 3 o 4 The carrier core material of Example 2 was obtained in the same manner as in Example 1 except that the amount of the mixed raw material powder was 0.5% by mass in terms of P element, and the P powder was added by weighing.

[0128] Table 1 shows the additive amount of the carrier core material, powder properties, magnetic properties, and evaluation test results described later.

[0129] further, figure 2 The SEM image (a) of 4000 times of the carrier core material in Example 2, the mapping image (b) of P measured by EDS at the same part and the same magnification as the above SEM image, and the mapping image (c) of Mg .

Embodiment 3

[0131] According to relative to Fe 2 o 3 , MgO, Mn 3 o 4 The carrier core material of Example 3 was obtained in the same manner as in Example 1, except that the amount of the mixed raw material powder was 1.0% by mass in terms of P element, and the P powder was added by weighing.

[0132] Table 1 shows the additive amount of the carrier core material, powder properties, magnetic properties, and evaluation test results described later.

[0133] further, image 3 The SEM image (a) at 4000 magnification of the carrier core material of Example 3, the mapping image (b) of P and the mapping image (c) of Mg measured by EDS at the same part and at the same magnification as the above SEM image are shown.

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Abstract

There is provided a carrier core material for electrophotographic developer containing a soft ferrite, expressed by (Mg X Mn 1-X )Fe 2 O 4 (wherein X is in a range of 0.1 X < 1.), wherein an analysis value of P on the surface of the carrier core material is 0.1 mass% or more, an analysis value of Mg is 2 mass% or more, a content of Mg in the carrier core material is 2 mass% or more by EDS, and when the content of Mg in the carrier core material is expressed by M1, and the analysis value of Mg on the surface of the carrier core material by EDS is expressed by M2, a value of M2 / M1 exceeds 1.0.

Description

technical field [0001] The present invention relates to a carrier core material for an electrophotographic developer, a method for producing the same, a carrier for an electrophotographic developer, and an electrophotographic developer. Background technique [0002] Conventionally, as an electrophotographic developing method used in copiers, printers, and the like, a cascade method, a magnetic brush developing method, and other methods have been used. In recent years, a common method is a magnetic brush development method in which a toner image is developed on an electrostatic latent image formed on a photosensitive drum by a magnetic brush and then thermally fixed to obtain an image. Furthermore, recently, two-component developers are often used in which toner is electrostatically oriented on particles of a carrier for electrophotographic developer (in the present invention, it may be described as "carrier"), and on the carrier A magnetic brush is formed. [0003] In the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/107G03G9/113
CPCG03G9/107G03G9/1075G03G9/1136G03G9/113G03G9/1085G03G9/1087
Inventor 中村昌弘河内岳志北村利哉
Owner DOWA ELECTRONICS MATERIALS CO LTD
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