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Toner, developer, image forming method and image forming device

A technology for toner and developer, applied in the field of toner, can solve the problems of easy detachment of charging control agent, deterioration of developer performance, uneven charging of toner, etc., and achieves good color reproduction performance, elimination of operational trouble, and color development performance. good effect

Inactive Publication Date: 2005-12-21
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Here, the disadvantages of the two-component developing method are that the performance of the developer is deteriorated due to the adhesion of the toner particles to the surface of the carrier, and the concentration of the toner in the developer is reduced because only the toner is consumed.
[0011] However, many of these above-mentioned charge control agents are colored so that they cannot be used for color toners
Also, the disadvantages of these charge control agents are: due to the poor compatibility with the binder, the charge control agent present on the surface of the toner which has a great relationship with the charging performance is easily detached; uneven charging of the toner and Contamination and film formation on the developing sleeve and photoreceptor
However, the above-mentioned resin charge control agents cannot maintain their charge control effect, and contaminate the developing sleeve and the developer layer thickness limiting member (scraper and roller), so that the charging performance of the toner is low, or there is contamination of the photoreceptor. Film formation

Method used

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  • Toner, developer, image forming method and image forming device
  • Toner, developer, image forming method and image forming device
  • Toner, developer, image forming method and image forming device

Examples

Experimental program
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specific Embodiment approach

[0148] Hereinafter, the image forming apparatus of the present invention will be specifically described with reference to examples and comparative examples. If the device is a device that forms an image by an electro-optical method, such as a copying machine, a printer, and a facsimile machine, the image forming device is not limited.

[0149] figure 1 is a schematic diagram of an embodiment of the image forming apparatus of the present invention. The device is composed of an image forming device assembly 100 (printer part), a paper feeding platform (box) 200 (paper feeding part), a scanner 300 (scanning part) installed in the device assembly 100, and a scanner located on the scanning part. The automatic document feeder (ADF) 400 (document feeding part) constitutes. In addition, a control unit for controlling the operation of each device in the above-mentioned device is also installed on the device (not shown in the figure).

[0150] The scanner section 300 reads image info...

Synthetic example 1

[0210] Polyoxypropylene (2,2)-2,2-bis(4-hydroxyphenyl)propane 740g, polyoxyethylene (2,2)-2,2-bis(4-hydroxyphenyl)propane 300g, p- Add 466g of dimethyl phthalate, 80g of isododecenyl succinic anhydride, 114g of tri-n-butyl 1,2,4-phenyltricarboxylate and esterification catalyst together with stirring device, thermometer, nitrogen inlet, A four-opened separable flask with a flow-down condenser and cooling tube. In a nitrogen atmosphere, the temperature was raised to 210°C under normal pressure, the reaction was stirred, and then the pressure was reduced at 210°C. Thus, the content of the molecular weight below 500 is 3.5%, the peak molecular weight is 7,500, the Tg is 62°C, the Mw / Mn ratio is 5.1, the acid value is 2.3KOHmg / g, and the apparent viscosity measured by the flow tester is 10 4 A polyester resin having a temperature of 112° C. at Pa·s (hereinafter referred to as polyester resin A).

Synthetic example 2

[0212] Polyoxypropylene (2,2)-2,2-bis(4-hydroxyphenyl)propane 71,225g, polyoxyethylene (2,2)-2,2-bis(4-hydroxyphenyl)propane 165g, 500 g of dimethyl terephthalate, 130 g of isododecenyl succinic anhydride, 170 g of triisopropyl 1,2,4-phenyltricarboxylate and an esterification catalyst were put into the flask together. React under the same apparatus and conditions as in Synthesis Example 1. Thus, the content of the molecular weight below 500 is 3.0%, the peak molecular weight is 8,000, the Tg is 62°C, the Mw / Mn ratio is 4.7, the acid value is 0.5KOHmg / g, and the apparent viscosity measured by the flow tester is 10 4 A polyester resin having a temperature of 116° C. at Pa·s (hereinafter referred to as polyester resin B).

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Abstract

The present invention relates to a toner used in a developer for electrostatic image development, and an electrophotographic developing device using the toner. The toner contains at least one binder resin, a colorant, and a charge control agent, and is characterized in that the binder resin includes a polyester resin, and the polyester resin has a molecular weight of 500 or less. The polyester has at least one peak in the molecular weight range of 3000-9000 in the molecular weight distribution measured by gel permeation chromatography at 4% by weight or less, and the polyester does not contain THF-insoluble components. The charge control agent is a resin charge control agent, and the resin charge control agent includes constituent units obtained from the following monomers: monomers containing sulfonate groups, aromatic monomers with electron-attracting groups, and acrylate and / or methacrylate monomers.

Description

technical field [0001] The present invention relates to a toner used as a developer for electrostatic charge image development in electrophotography, electrostatic recording, electrostatic printing, etc., and an electrophotographic developing device using the toner. More particularly, the present invention relates to a toner for electrophotography, a developer for electrophotography, and an electrophotographic developing agent for use in copiers, laser printers, plain paper facsimile machines, etc., which directly or indirectly use electrophotographic developing methods. device. Also, the present invention relates to a toner for electrophotography and a developer for electrophotography used in color copiers, color laser printers, color plain paper facsimile machines, and other machines using electrophotographic multi-color image development methods directly or indirectly and an electrophotographic developing device. Background technique [0002] A deve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G9/087G03G9/097
CPCG03G9/08704G03G9/08706G03G9/08711G03G9/08728G03G9/08755G03G9/08791G03G9/08795G03G9/08797G03G9/09733G03G9/0975
Inventor 伏见宽之南谷俊树内野仓理八木慎一郎加藤光辉
Owner RICOH KK