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Method for producing polymerized toner, polymerized toner, method for producing binder resin for toner and binder resin for toner

A technology of binder resin and toner, applied in the fields of production of polymerized toner, polymerized toner, production of binder resin for toner and binder resin for toner, can solve the problem of undeveloped It solves the problems of the production method of polymerizable monomer and decomposition product residue retention, the deterioration of developability, and the widening of particle size range, so as to achieve the effect of excellent triboelectric charging stability.

Inactive Publication Date: 2010-03-24
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the brittleness of the resin composition is made high, there occurs a problem that the particle diameter range of the particles obtained by finely pulverizing tends to widen
Therefore, there arises a problem that even after toner production is completed, the toner is liable to be further finely pulverized when used in a developing unit, and the colorant is exposed to fracture surfaces of toner particles to cause deterioration of developability
[0017] As described above, as it stands now, with respect to polymerized toners produced by the suspension polymerization method, no development has been developed that can solve the problems caused by the residual presence of unreacted polymerizable monomers and decomposition product residues in the toner particles. Various problems caused by the production method

Method used

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  • Method for producing polymerized toner, polymerized toner, method for producing binder resin for toner and binder resin for toner
  • Method for producing polymerized toner, polymerized toner, method for producing binder resin for toner and binder resin for toner
  • Method for producing polymerized toner, polymerized toner, method for producing binder resin for toner and binder resin for toner

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0144] Preparation of pigment dispersion paste:

[0145] Styrene: 78.0 parts by mass

[0146] Carbon black: 7.0 parts by mass

[0147] The above-mentioned raw materials were thoroughly premixed in a container while maintaining the mixture thus obtained at a temperature of 20° C. or lower, and the mixture was uniformly dispersed and mixed for about 4 hours using an attritor (manufactured by Mitsui Miike Kakoki Co., Ltd.), thereby preparing Pigment dispersion paste.

[0148] Prepare toner particles:

[0149] Add 390 parts by mass of 0.1mol / liter Na to 1150 parts by mass of ion-exchanged water 3 PO 4 Aqueous solution, heat the resulting mixture with stirring to a temperature of 60°C, and then add 58 parts by mass of 1.0mol / liter CaCl 2 Aqueous solution was added to the mixture, and the mixture was further continuously stirred to prepare the 3 (PO 4 ) 2 Aqueous medium of dispersion stabilizer.

[0150] On the other hand, the following raw materials were added to the pigme...

Embodiment 2

[0164] In addition to using 5.9 parts by mass of 2,5-bis(ethylbutyryl peroxy)-2,5-dimethylhexane as a polymerization initiator instead of 5.0 parts by mass of 2,5-bis(iso butyrylperoxy)-2,5-dimethylhexane, and the temperature at the time of polymerization was raised to 89°C instead of 84°C in Example 1, and the tint was prepared in the same manner as in Example 1 agent.

Embodiment 3

[0209] Preparation of toner particles:

[0210] In 300 parts by mass of ion-exchanged water, 0.2 parts by mass of polyvinyl alcohol was dissolved to prepare an aqueous medium. On the other hand, 78.0 parts by mass of styrene, 22.0 parts by mass of n-butyl acrylate, and 2.5 parts by mass of 2,5-bis(isobutyryl peroxy)-2 used as a polymerization initiator in Example 1 were mixed together, 5-dimethylhexane, thereby preparing the monomer composition. The monomer composition was put into an aqueous medium, and stirred for 15 minutes with a TK homomixer (manufactured by Tokushu Kika Kogyo Co., Ltd.), thereby preparing a suspension dispersion.

[0211] In a nitrogen atmosphere, the temperature of the suspension dispersion was raised to 90° C. to start polymerization, and further maintained at this temperature for 24 hours to complete the polymerization reaction. When the reaction was completed, the suspension dispersion was cooled, filtered, washed with water and dried to yield Bind...

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Abstract

The present invention provides a method for producing a toner that can suppress the production of the decomposition products derived from a polymerization initiator, and can suppress the remaining presence, in the toner particles, of the unreacted polymerizable monomer and decomposition product residues. On the basis of this method, the present invention provides a toner that is excellent in triboelectric charging stability and can yield stable images over a long term. The present invention provides a method for producing a polymerized toner including a step of producing a polymerized toner particle by dispersing in an aqueous medium a polymerizable monomer composition including at least a polymerizable monomer and a colorant and by polymerizing the polymerizable monomer by using a polymerization initiator in the aqueous medium, the method being characterized in that the polymerization initiator has a structure represented by the following General Formula: (wherein R1 and R2 each independently represent an optionally branched or substituted aliphatic hydrocarbon group having 1 to 6 carbon atoms, and R3 represents an optionally branched aliphatic hydrocarbon group having 3 to 12 carbon atoms).

Description

technical field [0001] The present invention relates to a toner production method for forming a toner image by developing an electrostatic latent image formed by a method such as an electrophotographic method, an electrostatic recording method, a toner jet recording method, or the production of a toner used in toner The method of binder resin in the agent. Background technique [0002] Various methods are known as image forming methods based on the electrophotographic method. Generally, by using a photoconductive substance, an electrostatic latent image is formed on an electrostatic image bearing member (hereinafter also referred to as a "photosensitive member") by using various techniques. Then, by developing with toner, the electrostatic latent image is converted into a visible image, and the visible image formed with the toner is transferred to a recording medium such as paper as required, and thereafter, is applied to the recording medium by heat or pressure. Fusing to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/08
CPCG03G9/0806G03G9/08
Inventor 谷笃藤本则和板桥仁
Owner CANON KK
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