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Electrostatic image developing toner and method for producing electrostatic image developing toner

A technology for electrostatic image development and manufacturing methods, which is applied in the directions of developer, electrography, optics, etc., can solve problems such as fogging, difficulty in suppressing fogging, and color spots in formed images, and achieves excellent heat-resistant preservation and suppression bad image effect

Inactive Publication Date: 2016-08-10
KYOCERA DOCUMENT SOLUTIONS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, it is difficult to suppress the formation of fog in the image
[0008] In addition, in the above toner particles, since the molar ratio of the quaternary ammonium salt-containing acrylate unit in the resin constituting the shell layer is about 1%, depending on the formation state of the shell layer, the toner particles may be shorter or shorter. has not been charged to the desired charge level for a period of time
In this case, color spots and fog tend to occur in the formed image

Method used

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  • Electrostatic image developing toner and method for producing electrostatic image developing toner
  • Electrostatic image developing toner and method for producing electrostatic image developing toner
  • Electrostatic image developing toner and method for producing electrostatic image developing toner

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0015] A first embodiment of the present invention relates to a toner for electrostatic image development (hereinafter also referred to as toner). The toner particles included in the toner for developing an electrostatic image according to the first embodiment are formed by covering the surface of core particles containing a binder resin made of polyester resin with a shell layer. The shell layer is composed of a resin that is a copolymer of monomers including a monomer having a quaternary ammonium group and a (meth)acrylic monomer. The molar ratio of the unit derived from the monomer which has a quaternary ammonium group in a copolymer is 5 mol% or more and 35 mol% or less. The toner of the present invention is composed of toner particles, but may also contain other components.

[0016] The core particles may contain components such as a colorant, a mold release agent, a charge control agent, and magnetic powder in the binder resin as needed. Toner particles may further hav...

no. 2 approach

[0104] A second embodiment of the present invention relates to a method for producing an electrostatic image developing toner capable of suitably producing the electrostatic image developing toner of the first embodiment.

[0105] Typical methods for producing toner particles with a core-shell structure including a polyester resin as a binder resin include the following methods. First, core particles containing a polyester resin are dispersed in an aqueous medium in the presence of an anionic dispersant or a nonionic dispersant. Next, fine resin particles are attached to the surface of the core particles. Then, a method of forming a shell layer by forming a film of fine resin particles on the surface of the core particle by heat.

[0106] However, in the conventional method for producing toner particles with a core-shell structure, when fine particles of resin having many quaternary ammonium groups are used as the material of the shell layer, when the resin fine particles are...

preparation example 1

[0176] [Preparation of Polyester Resin Microparticle Dispersion A]

[0177] An aqueous dispersion containing polyester resin microparticles was prepared using the amorphous polyester resin a described below in the following manner.

[0178] (amorphous polyester resin a)

[0179] Melting temperature (Tm): 74.7°C

[0180] Glass transition temperature (Tg1): 37.5°C

[0181] Acid value: 20.5mgKOH / g

[0182] The amorphous polyester resin a was coarsely pulverized to an average particle diameter of about 10 μm using a turbo pulverizer T250 (manufactured by Turbo Industry Co., Ltd.). 100 g of the obtained coarsely pulverized product, 2 g of an anionic dispersant (EMARO (manufactured by Kao Corporation), SDS (sodium dodecyl sulfate)) and 50 g of a 0.1N-sodium hydroxide aqueous solution were mixed. Ion-exchanged water was added to the obtained mixture to prepare a total amount of 500 g of slurry. The resulting slurry was put into a pressure-resistant round-bottomed stainless steel...

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Abstract

The present invention provides a toner for developing electrostatic images and a method for producing a toner for developing electrostatic images with improved characteristics. The toner for developing electrostatic images of the present invention includes toner particles in which the surfaces of core particles containing a binder resin composed of a polyester resin are covered with a shell layer. The shell layer is formed of a resin composed of a (meth)acrylic copolymer in which the molar ratio of units derived from a monomer having a quaternary ammonium group is 5 mol % or more and 35 mol % or less. The toner for developing electrostatic images of the present invention is excellent in heat-resistant storage stability, and the toner can be charged to a desired charge amount even if the toner is stirred in the developing device for a long time. Therefore, if the electrostatic image development of the present invention is used The use of toner can suppress the occurrence of fog in forming images. Furthermore, if the toner for developing electrostatic images of the present invention is used, the occurrence of image defects in formed images such as color spots and fog, and the formation of images due to toner adhesion to the developing sleeve and photosensitive drum can be suppressed quality deteriorated.

Description

technical field [0001] The present invention relates to a toner for developing an electrostatic image and a method for producing the toner for developing an electrostatic image. Background technique [0002] Generally, in the electrophotography method, after the surface of the photosensitive drum is charged by a method such as corona discharge, it is exposed by means of a laser or the like to form an electrostatic latent image. The formed electrostatic latent image is developed with toner to form a toner image. A high-quality image is obtained by transferring the formed toner image to a recording medium. Usually, toner images are formed using toner particles that are obtained by kneading, pulverizing, and classifying after mixing constituent components of toner particles such as a colorant, a charge control agent, and a release agent with a binder resin such as a thermoplastic resin. , Toner with toner particles (toner mother particles) having an average particle diameter ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G9/113
CPCG03G9/09307G03G9/09321G03G9/0935G03G9/09357G03G9/09392G03G9/0804G03G9/08755
Inventor 菊岛诚治
Owner KYOCERA DOCUMENT SOLUTIONS INC
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