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Toner for magnetic single-component development

A single-component, toner technology, applied in the direction of developer, electric recording process applying charge pattern, equipment applying electric recording process of charge pattern, etc., can solve the problem of easy deterioration of image quality, etc. Effect

Active Publication Date: 2014-01-15
KYOCERA DOCUMENT SOLUTIONS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the above-mentioned magnetic toner, the image quality of the thin line image formed after repeated image formation tends to deteriorate compared with the thin line image formed at the initial stage.

Method used

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  • Toner for magnetic single-component development
  • Toner for magnetic single-component development
  • Toner for magnetic single-component development

Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1

[0076] (production of polyester resin)

[0077] 1,960 g of propylene oxide adducts of bisphenol A, 780 g of ethylene oxide adducts of bisphenol A, 257 g of dodecenyl succinic anhydride, 770 g of terephthalic acid, and dibutyltin oxide were placed in a reaction vessel 4g. The inside of the reaction container was heated up to 235° C. under a nitrogen atmosphere, and the reaction was carried out at this temperature for 8 hours. Thereafter, the inside of the reaction container was decompressed to 8.3 kPa, and the reaction was carried out at this temperature for 1 hour. Next, after cooling the reaction product to 180 degreeC, trimellitic anhydride was added in reaction container, and the acid value of polyester resin was adjusted to about 10 mgKOH / g. Thereafter, the contents of the reaction vessel were heated up to 210° C. at a rate of 10° C. / hour, and a polyester resin was obtained by reacting at this temperature.

manufacture example 2

[0079] (Manufacture of charge control resin)

[0080] A 3-L flask equipped with a stirrer, a capacitor, a thermometer, and a nitrogen introduction tube was used as a reaction vessel. 1000 g of pure water and 4 g of sodium dodecyl sulfate (SDS) were put into the reaction container as an emulsifier, and nitrogen substitution was performed for 30 minutes. Next, in the reaction container, 2 g of potassium persulfate (KPS) was added, stirred and dissolved. Nitrogen gas was introduced into the reaction container to make the inside of the reaction container a nitrogen atmosphere, and then the temperature of the contents of the reaction container was raised to 80°C. Thereafter, while maintaining the state of 80°C, a mixed monomer composed of 300 g of styrene and 60 g of 2-ethylhexyl acrylate (2-EHA), and 2-acrylamide-2-methylpropanesulfonic acid An aqueous solution of (AAPS) 40 g dissolved in 600 g of pure water was dropped into the flask over 2 hours. Thereafter, polymerization wa...

Embodiment 1～7 and comparative example 1～6

[0082] (Preparation of Toner Masterbatch)

[0083] Using a Henschel mixer, 45 parts by mass of a binder resin (polyester resin obtained in Production Example 1), 5 parts by mass of a release agent (carnauba wax (manufactured by Kato Yoko Co., Ltd.)), and a charge control resin (manufactured in Example 1) were mixed. 5 parts by mass of the styrene-acrylic acid copolymer obtained in 2) and 45 parts by mass of magnetic powder (magnetite, TN-15 (manufactured by Mitsui Metal Mining Co., Ltd.)). The obtained mixture was melt-kneaded using a twin-screw extruder, and then cooled. The obtained melt-kneaded product was coarsely pulverized using a hammer mill (Feather Mill FM-1 type (manufactured by Hosokawa Micron Co., Ltd.)). The obtained coarsely pulverized product was finely pulverized using a mechanical pulverizer. Thereafter, the first classification was performed using a rotor rotating classifier (200TSP (manufactured by Hosokawa Micron Co., Ltd.)) at the rotation speed (rpm) de...

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Abstract

The invention provides a toner for magnetic single-component development with improved characteristics. The toner for magnetic single-component development contains at least a binder resin which is a polyester resin, magnetic powder, and a charge control resin, wherein the ratio (%) of the area of the charge control resin present on the surface of the toner particles with respect to the area of the toner particles on an electron microscope image is made to be in a predetermined range corresponding to the particle diameter of the toner particles. By using the toner for magnetic single-component development of the present invention, it is capable of suppressing the problems of image density of the formed image being lower than that desired, of image defects like fogging occurring in the formed image, and the quality of the formed image being deteriorated in the case where image formation is carried out for a long time.

Description

technical field [0001] The present invention relates to a toner for magnetic one-component development. 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 to laser light or the like to form an electrostatic latent image. The formed electrostatic latent image is developed with toner to form a toner image. By transferring the formed toner image to a recording medium, a high-quality image can be obtained. Generally, toner particles (toner master particles) having an average particle diameter of 5 μm to 10 μm in which a colorant, charge, and charge are mixed with a binder resin such as a thermoplastic Particles obtained by kneading, pulverizing, and classifying the components such as the control agent and the mold release agent. In addition, inorganic fine powder such as silica or titanium oxide is externally added to the toner base particles in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/083G03G15/08
CPCG03G9/09733G03G9/0815G03G9/0817G03G9/0819G03G9/083G03G9/08755G03G9/08791G03G9/08797
Inventor 玉垣昌志田中崇伯
Owner KYOCERA DOCUMENT SOLUTIONS INC
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