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Process for producing polymerization toner, process for producing binder resin for toner, and toner

A technology of binder resin and toner, applied in developing agent, electrography, optics, etc., can solve problems such as unreacted polymerizable monomer or decomposition product residue, image quality degradation, photosensitive member pollution, etc., to achieve Excellent charging stability, eliminating the influence of polymerization inhibitors, and improving efficiency

Active Publication Date: 2010-01-20
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the increase in brittleness of the resin composition involves the problem that the particle diameters of particles obtained by finely pulverizing the resin composition tend to cover a wide range
In addition, even after the particles are converted into toner, the particles tend to be additionally reduced in size during the use of the toner in the developing device, thus also causing the problem of exposure of the toner particles by the colorant. The broken-out section of the toner causes a decrease in the developing performance of the toner
In addition, contamination of the photosensitive member by the toner carrying member or film is liable to occur, thus causing a problem in that a decrease in the quality of an image formed with toner occurs
[0017] As described above, at present, no production method has been obtained with which it is possible to solve the problem that, in the polymerized toner by the suspension polymerization method, unreacted polymerizable monomers or residues of decomposition products remain in the toner particles causing various defects of

Method used

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  • Process for producing polymerization toner, process for producing binder resin for toner, and toner
  • Process for producing polymerization toner, process for producing binder resin for toner, and toner
  • Process for producing polymerization toner, process for producing binder resin for toner, and toner

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0175] Production of pigment-dispersed pastes

[0176] Styrene: 78.0 parts by mass

[0177] Carbon black: 7.0 parts by mass

[0178] The above-mentioned materials were fully premixed in a container, and then, the temperature of the mixture was kept below 20° C., and the mixture was dispersed and mixed with an attritor (manufactured by Mitsui Miike Machinery Co., Ltd.) for about 4 hours, A pigment-dispersed paste is thus produced.

[0179] Production of toner particles

[0180] 390 mass parts of 0.1-mol / l Na 3 PO 4 The aqueous solution of the solution was introduced into 1,150 parts by mass of ion-exchanged water, and the temperature of the mixture was raised to 60° C. while stirring the mixture. Thereafter, 58 mass parts of 1.0-mol / l CaCl 2 Aqueous solution of is added to the mixture, and the whole is further continuously stirred, thereby preparing 3 (PO 4 ) 2 An aqueous medium that constitutes a dispersion stabilizer.

[0181] Meanwhile, the following materials ...

Embodiment 2

[0236] In addition to using 6.8 parts by mass of 3-hydroxy-1,1-dimethylbutylperoxy-2-ethylbutyl ester instead of 6.0 parts by mass of 3-hydroxy-1,1-dimethylbutylperoxyisobutyl A toner was produced in the same manner as in Example 1 except that the temperature at the time of polymerization was changed to 81°C.

Embodiment 3

[0278] Production of binder resins for toners:

[0279] An aqueous medium was prepared by dissolving 0.2 parts by mass of polyvinyl alcohol in 300 parts by mass of ion-exchanged water. At the same time, 78.0 parts by mass of styrene, 22.0 parts by mass of n-butyl acrylate, and 2.5 parts by mass of 3-hydroxy-1,1-dimethylbutyl peroxyiso Butyl ester, thus preparing the monomer composition. The monomer composition was introduced into an aqueous medium, and the mixture was stirred for 15 minutes with a TK-homomixer (manufactured by Tokushu Kika Kogyo), thereby preparing a suspension dispersion. Under a nitrogen atmosphere, the temperature of the above suspension dispersion liquid was raised to 85° C., and polymerization was initiated. Furthermore, the liquid was kept at this temperature for 24 hours to complete the polymerization reaction. After the reaction was completed, the suspension dispersion liquid was cooled, separated by filtration, washed with water and dried, thereby ...

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Abstract

A process for polymerization toner production which can inhibit a polymerization initiator from generating decomposition products and inhibit an unreacted monomer and a decomposition product residue from remaining in the toner particles. The process for polymerization toner production comprises dispersing a polymerizable-monomer composition comprising a polymerizable monomer and a colorant in an aqueous medium and polymerizing the polymerizable monomer in the aqueous medium with the aid of a polymerization initiator to produce toner particles, and is characterized in that the polymerization initiator is one having a specific structure and having a hydrogen-bond dissociation energy satisfying a specific relationship.

Description

technical field [0001] The present invention relates to a toner for visualizing a latent electrostatic image formed by a method such as electrophotography, electrostatic recording, magnetic recording or toning, and a method for producing the toner Dose jet recording method. Background technique [0002] Various methods are known as image forming methods each based on electrophotography. A general image forming method is as follows. An electrostatic latent image is formed in various ways on an electrostatic image bearing member (hereinafter referred to as "photosensitive member") using a photoconductive substance. Next, the electrostatic latent image is developed with a toner to be converted into a visible image, and the visible image formed with the toner is transferred to a recording medium such as paper if necessary. Thereafter, the visible image is fixed as a toner image onto a recording medium with heat or pressure, thereby obtaining a replica. The image forming appa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/087C08F2/44
CPCG03G9/08702G03G9/0806C08F2/44G03G9/087
Inventor 谷笃藤本则和板桥仁
Owner CANON KK
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