Toner for electrostatic image development

一种静电荷图像、调色剂的技术，应用在静电荷图像显影用调色剂领域，能够解决画质劣化、难调色剂粒子带电性（带电稳定性、画质恶化等问题，达到抑制带电量的上升、无损线条重现性、优异流动性的效果

Active Publication Date: 2013-03-06
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the function of the external additive is reduced, and it is difficult to provide toner particles with stable chargeability over time (charge stability)
[0007] In addition, the toner particles in which the external additives are submerged have a phenomenon in which the toner particles adhere to the surface of the photoreceptor (filming phenomenon), and image quality degradation due to fogging or the like is likely to occur.
External additives released (detached) from the surface of toner particles degrade the charging characteristics of the photoreceptor surface, resulting in deterioration of the printing durability and image quality of the toner
In particular, under high-temperature and high-humidity conditions, filming causes significant deterioration in image quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0037] (A-1) Preparation process of polymerizable monomer composition

[0038] First, a polymerizable monomer, a colorant, and if necessary, other additives such as a charge control agent and a release agent are mixed to prepare a polymerizable monomer composition. In mixing to prepare the polymerizable monomer composition, for example, a media type disperser is used.

[0039]In the present invention, the polymerizable monomer refers to a monomer having a polymerizable functional group, and the polymerizable monomer is polymerized to form a binder resin. As the main component of the polymerizable monomer, a monovinyl monomer is preferably used. Examples of monovinyl monomers include styrene; styrene derivatives such as vinyltoluene and α-methylstyrene; acrylic acid and methacrylic acid; methyl acrylate, ethyl acrylate, propyl acrylate, and butyl acrylate. Acrylates such as esters, 2-ethylhexyl acrylate and dimethylaminoethyl acrylate; methyl methacrylate, ethyl methacrylate,...

Embodiment

[0174] Hereinafter, although an Example and a comparative example are given and this invention is demonstrated more concretely, this invention is not limited only to these Examples. It should be noted that unless otherwise specified, "parts" and "%" are mass standards.

[0175] The test methods performed in the present examples and comparative examples are as follows.

[0176]

[0177] I-1. Production of core-shell composite particles

manufacture example I-1

[0179] In a container with a stirrer replaced with nitrogen, 3 parts of soft dodecylbenzenesulfonic acid was dissolved in 150 parts of ion-exchanged water, and then 95 parts of styrene was emulsified to prepare a polymerizable monomer emulsion. After raising the temperature of the emulsion to 80° C., 0.6 parts of potassium persulfate dissolved in 10 parts of ion-exchanged water was added, and polymerization was performed for 2 hours. Next, the temperature of the reactor was lowered to 40°C, 5 parts of divinylbenzene was added, stirred for 2 hours, the temperature was raised to 85°C, 0.1 part of potassium persulfate dissolved in 2 parts of water was added, and polymerization was carried out for 4 hours. reaction. Hydroquinone aqueous solution was added as a reaction terminator to terminate the polymerization. The polymerization conversion rate at this time was 99%. Water-soluble substances were removed by ultrafiltration. Adjust the pH and concentration of the emulsion to ob...

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Abstract

Provided is a toner for electrostatic image development, which has excellent fluidity and inhibits reduction in the amount of toner charge and generation of fogging in high-temperature, high-humidity environments. The toner for electrostatic image development comprises: colored resin particles containing an adhesive resin and a coloring agent; and an external additive. Core-shell composite microparticles constitute the external additive, in which the surface of resin microparticles is coated by at least one inorganic component selected from the group consisting of silica, alumina, titania, and zirconia. When the total volume of the core-shell composite microparticles is 100 vol%, the volume percentage of the inorganic component(s) in the core-shell composite microparticles is 45-75 vol%.

Description

technical field [0001] The present invention relates to a toner for developing an electrostatic charge image (hereinafter, sometimes simply referred to as “toner”) used for developing an electrostatic latent image in electrophotography, electrostatic recording, electrostatic printing, or the like. Background technique [0002] The electrostatic latent image formed on the photoreceptor is developed with a toner for electrostatic charge image development, thereby forming a desired image. This technique is used in image forming devices such as electrophotographic devices, electrostatic recording devices, and electrostatic printing devices. has been widely applied. This technique is used in copiers, printers, facsimile machines, and their composite machines. [0003] For example, in an electrophotographic device using electrophotography, the surface of a photoreceptor containing a photoconductive substance is generally charged uniformly by various methods, and then an electrost...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/08
CPCG03G9/09708G03G9/0819G03G9/09716G03G9/09725G03G9/09342B82Y30/00Y10S977/773G03G9/0827G03G9/09392G03G9/09321G03G9/09328
Inventor 千叶尊黑川尚
Owner ZEON CORP
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