Toner for electrophotography

A technology of electrophotography and toner, applied in the direction of developer, electrography, instrument, etc., can solve the problems of image density drop, toner charging, toner charge increase, etc.

Active Publication Date: 2019-02-05
KYOCERA DOCUMENT SOLUTIONS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, when a dense cationic film is formed in order to obtain heat-resistant storage properties, the toner is easily charged (toner particles are excessively charged), and the charge amount of the toner may increase during repeated printing, and the image may be damaged. concentration drop

Method used

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  • Toner for electrophotography
  • Toner for electrophotography
  • Toner for electrophotography

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0122] (Preparation method of binder resin fine particle dispersion liquid)

[0123] The binder resin material is roughly pulverized using a pulverizer such as a turbo pulverizer, and the obtained coarse pulverized product is dispersed in an aqueous medium such as ion-exchanged water, and heated in this dispersed state. The heating temperature is preferably a temperature higher than Tm of the binder resin by 10°C or higher and lower than 200°C. Then, after the heating is completed, a strong shear force is applied using a high-speed shear emulsification device (for example, "CLEARMIX" manufactured by M-Technique Co., Ltd.), to obtain a binder resin fine particle dispersion.

[0124] The volume median diameter of the binder resin particles (D 50 ) is preferably 1 μm or less, more preferably 0.05 μm or more and 0.5 μm or less. If the volume median diameter (D 50 ) within such a range, it is easy to prepare nuclei with a narrow particle size distribution and a uniform shape. I...

Embodiment 1

[0188] (Preparation of low melting toner core)

[0189] A polyester resin was produced by reacting terephthalic acid with an alcohol (bisphenol A ethylene oxide adduct) having bisphenol A as a skeleton to which ethylene oxide was added. The polyester resin had an OHV value of 20 mgKOH / g, an AV of 40 mgKOH / g, a Tm of 100°C, and a Tg of 48°C. With respect to 100 parts by mass of the polyester resin, 5 parts by mass of C.I. Pigment Blue 15:3 (phthalocyanine pigment) was blended as a colorant, and 10 parts by mass of ester wax ("WEP-3" manufactured by NOF Corporation) was blended as a release agent. After mixing with a mixer (FM mixer), the flakes kneaded by a twin-screw extruder ("PCM-30" manufactured by Ikegai Co., Ltd.) were mixed with a mechanical pulverizer ("Turbo Pulverizer" manufactured by Freund Turbo Co., Ltd.). ") pulverized to 6 microns. Then, it was classified using a classifier ("Elbow-Jet" manufactured by Nippon Steel Mining Co., Ltd.), and the volume median diame...

Embodiment 2～6

[0217] As shown in the following Table 2, except that the neutralization conditions (pH after neutralizing agent input, temperature of neutralizing agent input) and cleaning conditions (conductivity of filtrate, amount of cleaning water, temperature of cleaning water) were changed, the others were the same as in the examples. 1 Similarly, a developer was produced.

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Abstract

An electrophotographic toner includes capsule toner particles that each include an anionic toner core having a zeta potential at pH 4 of no greater than -5 mV and a cationic shell layer disposed over a surface of the toner core. Each of the capsule toner particles has, at a surface thereof, a sodium concentration of no less than 200 ppm and no greater than 1,000 ppm as measured by an ICP spectrometer.

Description

technical field [0001] The present invention relates to toners for electrophotography, and particularly to capsule toners. Background technique [0002] A capsule toner is composed of a core, and a shell layer (capsule layer) formed on the surface of the core. As a method for producing a toner, a method is known in which a core is dispersed in a solid state in an aqueous medium in which a dispersant is dissolved, and a shell layer is coated on the surface of the core. [0003] Since this production method uses an anionic dispersant, if the anionic dispersant can be attached to the surface of the core, it is considered that aggregation of the core can be suppressed. However, since a dispersant with a small molecular weight is easily dissolved in an aqueous medium, it is difficult to adhere to the surface of the toner core. On the other hand, if the molecular weight of the dispersant is increased, the dispersant is likely to function as a polymer coagulant and aggregation of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G9/093G03G9/08
CPCG03G9/0825G03G9/09328G03G9/09371G03G9/09392
Inventor 宫本英稔
Owner KYOCERA DOCUMENT SOLUTIONS INC
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