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Toner for electrostatic development, image forming appratus

A technology of toner and electrostatic charge, which is applied in the field of toner for electrostatic charge development and image forming devices, which can solve problems such as image defects and achieve a good effect of maintaining chargeability

Active Publication Date: 2010-03-17
KYOCERA DOCUMENT SOLUTIONS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In other words, if the resin particles adhere to the surface of the photoreceptor, it is easy to cause image defects due to black spots and black stripes in the image.

Method used

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  • Toner for electrostatic development, image forming appratus
  • Toner for electrostatic development, image forming appratus
  • Toner for electrostatic development, image forming appratus

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0038] (Preparation method of toner mother particles)

[0039] The toner base particles can be prepared by known kneading and pulverization methods, polymerization methods, spinning methods, and the like. For example, when a kneading and pulverization method is used, the preparation is carried out in the following procedure. First, necessary raw materials such as the above-mentioned binder resin, a colorant according to the color of the toner, a charge control agent, and wax are mixed with a mixer such as a Henschel mixer. Then, after melting and mixing with a twin screw extruder or the like, it is pulverized with a crusher such as a hammer crusher. Then, the toner base particles can be obtained by performing classification with a classifier such as an airflow classifier.

[0040] The volume-based average particle diameter of the toner core particles thus obtained is preferably 3.0 μm to 10.0 μm.

[0041] In addition, the volume-based average particle diameter of the toner base pa...

Embodiment 1

[0116]

[0117] To 100 parts of a polyester resin (manufactured by Mitsui Chemicals, Almadex P645) obtained by condensing bisphenol and fumaric acid as a binder resin, a copper phthalocyanine pigment (pigment blue 15-3 (manufactured by BASF, Heliogen Blue D7079)) 4 parts, 2 parts of a quaternary ammonium compound (manufactured by ORIENT CHEMICAL, "Bontron P-51") as a charge control agent, and Fischer-Tropsch synthetic wax as a wax (manufactured by NIPPON SEIRO, "FT- 100”) 3 copies. The mixture was put into a Henschel mixer (manufactured by Mitsui Mine Co., Ltd.) and mixed for 2 minutes. Then, it was melt-kneaded with a twin-screw extruder to prepare a toner kneaded product. The obtained toner kneaded product was finely pulverized with a jet mill, and classified with an air classifier to obtain toner mother particles with a volume-based average particle size of 8 μm.

[0118] In addition, the volume-based average particle size of the toner base particles was measured with a part...

Embodiment 2～9

[0132] A two-component developer was prepared in the same manner as in Example 1 except that the type and amount of the resin fine particles were changed as shown in Table 1, and various evaluations were performed. The results are shown in Table 2.

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PUM

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Abstract

The invention provides a toner for electrostatic development and an image forming apparatus. The toner for electrostatic development may include toner base particles, resin fine particles added into the toner base particles, and hydrophobic silica. The resin fine particles may include a polymer having an isobornyl group-containing acrylate monomer. In the invention, the electrical property can bemaintained well, and the resin fine particles may be prevented from being attacted onto the surface of the light-sensitive body in the high-temperature and high-humidity environment.

Description

Technical field [0001] The present invention relates to a toner for electrostatic charge development and an image forming apparatus. Background technique [0002] In recent years, image forming apparatuses such as printers and multifunction machines have been required to increase image quality and lifespan, and to further increase speed. In response to these requirements, small particles of toner for electrostatic charge development (hereinafter, simply referred to as "toner") are expected. [0003] However, the smaller the particle diameter of the toner, the more difficult it is to control the charge amount of the toner particles. Therefore, there are limitations in terms of long life and high speed. [0004] Therefore, there is known a method of controlling the charge amount of the toner by changing the type or amount of the charge control agent constituting the toner base particles or the external additives externally added (added) to the toner base particles. [0005] Hydrophobi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/097G03G15/01
Inventor 仓增浩二
Owner KYOCERA DOCUMENT SOLUTIONS INC
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