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Toner for electrostatic latent image development

An electrostatic latent image and toner technology, which is applied in the directions of developers, electrographics, optics, etc., can solve the problems such as the decrease in the charge amount of toner particles, and achieve the effects of excellent heat-resistant storage and low-temperature fixability.

Active Publication Date: 2018-04-24
KYOCERA DOCUMENT SOLUTIONS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, if the toner particles are aggregated, the charge amount of the toner particles is likely to decrease.

Method used

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  • Toner for electrostatic latent image development
  • Toner for electrostatic latent image development
  • Toner for electrostatic latent image development

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0103] As a method for preparing the toner, it is preferable to cover the toner core with a shell layer composed of the above-mentioned specified material so that the interface between the toner core and the shell layer contains charged fine particles, or the interface between the toner core and the shell layer contains fine particles having a predetermined volume resistivity. Hereinafter, the method of preparing the toner core, the method of treating the surface of the toner core with the above-mentioned prescribed fine particles, and the shell The method for forming the layer will be described.

[0104] [Preparation method of toner core]

[0105] As a method for preparing the toner core, a method that can satisfactorily disperse components such as a colorant, a charge control agent, a release agent, and a magnetic powder in a binder resin is preferable.

[0106] When forming the toner of the present invention, the surface of the toner core is treated with the above-mention...

preparation example 1

[0179] (Preparation of binder resin (polyester resin))

[0180] According to the following method, prepare a glass transition temperature (Tg r )53.8℃, softening point (Tm r) 100.5°C, number average molecular weight (Mn) 1295, molecular weight distribution (Mw / Mn) 11.2, acid value 16.8 mgKOH / g and hydroxyl value 22.8 mgKOH / g polyester resin.

[0181] Into a 5 L four-necked flask, 1245 g of terephthalic acid, 1245 g of isophthalic acid, 1248 g of bisphenol A type ethylene oxide adduct, and 744 g of ethylene glycol were injected. Next, the inside of the flask was made into a nitrogen atmosphere, and the temperature inside the flask was raised to 250° C. while stirring. Next, after reaction was performed at 250°C under normal pressure for 4 hours, 0.875 g of antimony trioxide, 0.548 g of triphenyl phosphate, and 0.102 g of tetrabutyl titanate were added to the flask. Next, the pressure in the flask was reduced to 0.3 mmHg, and the temperature inside the flask was raised to 280...

preparation example 2

[0183] (Preparation of toner core)

[0184] Using a mixing device (Henschel mixer), 100 parts by mass of the binder resin obtained in Preparation Example 1, 5 parts by mass of a colorant (C.I. Pigment Blue 15:3, copper phthalocyanine), and a release agent (NOF Corporation) "WEP-3" ester wax manufactured by the company) 5 parts by mass were mixed to obtain a mixture. Next, the mixture was melt-kneaded using a twin-screw extruder ("PCM-30" manufactured by Ikegai Co., Ltd.) to obtain a kneaded product. The kneaded product was pulverized using a mechanical pulverizer (“turbo-mill” manufactured by Freund Turbo Industry Co., Ltd.) to obtain a pulverized product. Using a classifier ("Elbow jet" manufactured by Nippon Steel Mining Co., Ltd.), the pulverized product was classified to obtain the volume average particle diameter (D 50 ) of 6.0 μm and a toner core having an average circularity of 0.93. The volume average particle diameter of the toner core is measured using a Coulter p...

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Abstract

The present disclosure relates to an electrostatic latent image developing toner containing a toner particle including a toner core containing a binder resin and a shell layer coating a surface of the toner core. The shell layer contains a unit derived from a monomer of a thermosetting resin, and a unit derived from a thermoplastic resin. The thermosetting resin is one or more resins selected from the group of amino resins consisting of a melamine resin, a urea resin, and a glyoxal resin. The toner particle contains fine particles in an interfacial portion between the toner core and the shell layer, and the fine particles have a charge property opposite to that of the toner, or have a volume resistivity lower than both a volume resistivity of the binder resin and a volume resistivity of the shell layer.

Description

technical field [0001] The present invention relates to a toner for developing an electrostatic latent image. Background technique [0002] In order to achieve energy saving and downsizing of an image forming apparatus, it is desired to obtain a toner excellent in low-temperature fixability. By using a toner excellent in low-temperature fixability, it is possible to satisfactorily fix the toner to a recording medium even if the temperature of the fixing roller is low. In order to obtain a toner excellent in low-temperature fixability, a method of preparing a toner using a binder resin with a low melting point (or a binder resin with a low glass transition temperature) and a release agent with a low melting point has been proposed. However, in this method, it is difficult to prepare a toner excellent in heat-resistant storage stability. The heat-resistant storage property of the toner refers to the property that the toner particles contained in the toner exist without agglo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G9/093G03G9/08
CPCG03G9/09328G03G9/09314G03G9/09371G03G9/09385G03G9/09392
Inventor 小泽义夫辻广昌己高纲徹驹田良太郎
Owner KYOCERA DOCUMENT SOLUTIONS INC
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