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Electrophotographic developing agent

一种电子照相、显影剂的技术，应用在显影剂、电记录术、仪器等方向，能够解决耐久性和图像质量劣化等问题，达到改进图像光泽、改进熔合性能、保证耐久性的效果

Inactive Publication Date: 2008-06-25
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In many toners with high gloss, durability and image quality degrade with age

Method used

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  • Electrophotographic developing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] Using a Henschel mixer, 92 parts by weight of high-viscosity polyester resin and low-viscosity polyester resin shown in Table 1 (weight ratio 6:4, manufactured by Mitsubishi Rayon Co., Ltd.), 3 parts by weight of black colorant mogul- L (manufactured by Cabot Corporation), 2 parts by weight of charge control agent T-77 (manufactured by Hodogaya), and 3 parts by weight of carnauba wax (manufactured by Toa Kasei Co., Ltd.). Then, the resulting mixture was placed in a twin-screw extruder, and it was melt-extruded at 130°C. The extruded product was cooled to coagulate, and then the resulting kneaded intermediate material was pulverized using a mechanical mill (SR-15) and classified using a classifier to obtain an untreated toner having an average particle diameter of about 8 μm .

Embodiment 2

[0084] An untreated toner was prepared in the same manner as in Example 1, except that the mixing ratio of the high-viscosity polyester resin and the low-viscosity polyester resin was 5:5.

Embodiment 3

[0086] An untreated toner was prepared in the same manner as in Example 1, except that the mixing ratio of the high-viscosity polyester resin and the low-viscosity polyester resin was 3:7.

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PUM

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Abstract

A non-magnetic one-component electrophotographic developing agent is provided having improved properties. The electrophotographic developing agent includes parent toner particles comprising a binder resin, a releasing agent, a colorant, and a charge control agent, and an external additive which is added to a surface of the parent toner particles, wherein the binder resin comprises a high viscosity polyester resin having a weight average molecular weight of about 90,000-140,000 and a gel content of less than about 5% and a low viscosity polyester resin having a weight average molecular weight of about 52,000-65,000 and a gel content of less than about 2%. According to an embodiment of the present invention, an electrophotographic developing agent having improved image gloss and fusing property, while ensuring durability may be prepared by using a blended combination of a high viscosity polyester resin and a low viscosity polyester resin.

Description

technical field [0001] The present invention relates to an electrophotographic developer. More particularly, the present invention relates to an electrophotographic developer having improved fusing properties, image gloss, etc., while securing durability, by combining a high-viscosity polyester resin with a low-viscosity polyester resin. Background technique [0002] Currently, electrophotographic image processing devices such as laser printers, facsimile machines, copiers, and the like are widely used. The apparatus forms a desired image by forming a latent image on a photoreceptor using laser light, transferring toner to the latent image on the photoreceptor using a potential difference, and transferring the image to a printing medium such as paper. [0003] Recently, image forming devices such as laser beam printers (LBP) for electrophotography, multifunction machines, color copiers, etc. are widely used, and there is a need to improve the image quality of the devices. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/087G03G9/08
CPCG03G9/08797G03G9/08755G03G9/09716G03G9/08793G03G9/09725G03G9/08795G03G9/087G03G9/09G03G9/097G03G9/08
Inventor 崔皙勋金尚德李德熙昔起源
Owner SAMSUNG ELECTRONICS CO LTD
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