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Method of manufacturing toner for static charge phase development and toner

A manufacturing method and toner technology, which are applied in the directions of developers, electrographics, instruments, etc., can solve the problem of unclear wax dispersion state, and achieve the effects of excellent anti-rubbing and low-temperature fixability, excellent developability, and high resolution.

Inactive Publication Date: 2008-12-03
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no regulation on the method of controlling the wax near the surface of the toner, and the dispersion state of the wax is unknown

Method used

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  • Method of manufacturing toner for static charge phase development and toner
  • Method of manufacturing toner for static charge phase development and toner
  • Method of manufacturing toner for static charge phase development and toner

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0141] (production of polyester)

[0142] Add 690 parts of ethylene oxide 2 moles adduct of bisphenol A and 335 parts of terephthalic acid to the reaction tank with cooling tube, stirrer and nitrogen introduction tube, and carry out at 210°C under normal pressure nitrogen flow. 10 hours condensation reaction. Next, the reaction was continued for 5 hours while dehydrating under a reduced pressure of 10 to 15 mmHg, and then cooled to obtain polyester (1). The resin of the obtained polyester (1) had a weight average molecular weight of 6000, an acid value of 10 KOHmg / g, and a glass transition point of 48°C.

[0143] (manufacture of prepolymer)

[0144] Add 795 parts of ethylene oxide 2 molar adducts of bisphenol A, 200 parts of isophthalic acid, 65 parts of terephthalic acid, and dibutyltin Oxide 2 parts. The condensation reaction was carried out at 210° C. for 8 hours under a nitrogen flow at normal pressure. Next, under a reduced pressure of 10-15mmHg, react for 5 hours wh...

Embodiment 2

[0157] (Manufacture of wax dispersion)

[0158] Except that the bead diameter in embodiment 1 is changed to 0.3mm, the number of revolutions of the bead mill is changed to 600rpm, and the residence time in the bead mill is changed to 10min, the same operation as in embodiment 1 is carried out to obtain a wax with a wax particle diameter of 0.16 μm. Dispersion (2).

[0159] (manufacture of organic solvent composition)

[0160] An organic solvent composition (3) was obtained in the same manner as in Example 1, except that the wax dispersion (1) was changed to the above-mentioned wax dispersion (2).

[0161] (production of toner)

[0162] In addition to changing the above-mentioned organic solvent composition (1) into the above-mentioned organic solvent composition (3), the supply rate is 3240g / min, in addition, the supply rate of the above-mentioned organic solvent composition (2) is set to 400g / min, the above-mentioned The same operation as in Example 1 was carried out excep...

Embodiment 3

[0164] (Manufacture of wax dispersion)

[0165] Except that the rotation speed of the bead mill in Example 1 was changed to 400 rpm, and the residence time in the bead mill was changed to 5 minutes, the same operation as in Example 1 was carried out to obtain a wax dispersion (3) with a wax particle size of 0.66 μm.

[0166] (manufacture of organic solvent composition)

[0167] Except having changed the said wax dispersion liquid (1) into the said wax dispersion liquid (3), it carried out similarly to Example 1, and obtained the organic solvent composition (4).

[0168] (production of toner)

[0169] Except changing the above-mentioned organic solvent composition (1) into the above-mentioned organic solvent composition (4), the supply rate is set to 5265g / min, in addition, the supply rate of the above-mentioned organic solvent composition (2) is set to 650g / min, A yellow toner (3) was obtained in the same manner as in Example 1, except that the supply rate of the water-based...

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Abstract

Provided is a method of manufacturing electrostaic image development toner which has a good combination of low temperature fixability, cold offset resistance, hot offset resistance and anti-filming. A method of manufacturing a toner including adding an oil phase comprising an organic solvent in which a binder resin, a coloring agent and a releasing agent are dissolved or dispersed and an aqueous phase to an emulsification device equipped with a stirrer, continuously dispersing or emulsifying the oil phase and the aqueous phase in the emulsification device equipped with a stirrer to form a liquid dispersion or emulsion comprising oil phase particles, transporting the liquid dispersion or emulsion to a tank, removing the organic solvent from the liquid dispersion or emulsion followed by drying to form mother toner particles, wherein the releasing agent has been preliminarily prepared to have a dispersion diameter of from 0.15 to 0.7 [mu]m before the releasing agent is contained in the oil phase, a circumferential speed of the stirrer is from 15 to 25 m / s, and a volume particle diameter (DV') of the oil phase particles at an exit of the emulsification device to the tank and a volume average particle diameter (Dv) of the oil phase particles in the tank satisfy the following relationships: 3.0<=DV<=6.0, 4.0<=Dv'<=7.5; 1.0<=(Dv-Dv')<=3.0.

Description

technical field [0001] The present invention relates to a method for producing a toner for developing an electrostatic image having excellent low-temperature fixability and cold offset properties and having both heat offset resistance and conjunctival resistance, and the toner for developing an electrostatic image obtained thereby agent. Background technique [0002] In an electrophotographic image forming apparatus, the charging process of charging the surface of a photoreceptor as an image carrier by discharging and the exposure process of exposing the surface of the charged photoreceptor to form an electrostatic latent image have the same characteristics as The polarity toner of the electrostatic latent image formed on the surface of the photoreceptor is supplied to the photoreceptor for development, and the toner image is formed on the photoreceptor through these steps. The toner image formed on the photoreceptor is then transferred to an intermediate transfer body, tra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/087G03G9/09G03G9/08
CPCG03G9/0806G03G9/0804G03G9/08797G03G9/08782
Inventor 服部瑞基樋口信三门田孝洋三泽太辅高桥宽宇佐见俊彦宫川将士
Owner RICOH KK
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