Magnetic toner

A toner and magnetic technology, applied in the field of magnetic toners, can solve the problems of changes in chargeability and fluidity, inability to control toner concentration, and reduction in image density, and achieve good chargeability and fluidity, and excellent image quality. Reproducible, high image density effects

Inactive Publication Date: 2018-07-13
浙江恒烨新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a solution to this, a method of adding a large amount of external additives is known, but due to the deterioration of fixability, the release of external additives, and the change of the adhesion state on the toner, the chargeability and fluidity also change.
Regarding the fixability, it deteriorates significantly after adding external additives, especially the non-contact heating fixation will be more seriously affected
In addition, changes in chargeability and fluidity are caused by continuous printing due to the two-component development method that uses a magnetic permeability sensor to control the toner concentration in the developer, so that the toner concentration cannot be controlled at a specified value. A decrease in image density etc. becomes noticeable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0119] Example 1 Preparation of Magnetic Iron Oxide

[0120] The aqueous solution of ferrous sulfate was mixed with 1.0 equivalent of caustic soda solution with respect to the iron element and 1.5% by mass of sodium silicate (sodasilicate) in terms of silicon element with respect to the iron element. Thus, an aqueous solution containing ferrous hydroxide was prepared. While the pH of the aqueous solution was kept at 9.0, air was blown into the solution so that the oxidation reaction could proceed at 80°C or higher to 90°C or lower. Thus, a slurry liquid from which seed crystals will be produced is prepared. Next, an aqueous solution of ferrous sulfate was added to the slurry liquid in an amount of 1.0 equivalent to the alkali amount (sodium component of caustic soda). Thereafter, the pH of the slurry liquid was kept at 8.0, and the oxidation reaction proceeded while air was blown into the liquid. Thus, a slurry liquid containing magnetic iron oxide was obtained. The slurry...

Embodiment 2

[0121] The preparation of embodiment 2 polyester resin

[0122] Put 40 parts by weight of PO (propylene oxide) 2 mole adducts of bisphenol A, 30 parts by weight of EO (ethylene oxide) 2 moles of adducts of bisphenol A, 25 parts by weight of terephthalic acid in the reaction tank Parts by weight, 4 parts by weight of fumaric acid, 5 parts by weight of trimellitic anhydride, and 2.5 parts by weight of dibutyltin oxide were polycondensed at 220° C. to obtain polyester binder resin 1 . The resin had an acid value of 22 mgKOH / g, a hydroxyl value of 32 mgKOH / g, a Tg of 59° C., a weight average molecular weight (Mw) of 200,000, and a THF insoluble content of 14% by weight.

Embodiment 3

[0123] Embodiment 3 Preparation of graphite sheet doped with nitrogen

[0124] Put the cleaned small quartz tube into a large quartz tube reactor, then put it into a horizontal tube furnace, raise the temperature to 575°C in a hydrogen atmosphere, then turn off the hydrogen, introduce acetylene, and maintain it at a high temperature of 575°C. Acetylene was cracked by autoclaving for 4 hours. Finally, after the system is cooled to room temperature, collect the flaky graphite flakes at the bottom of the small quartz tube; weigh 5g of the prepared graphite flakes, put them into the quartz tube, and then put them into a horizontal tube furnace. Introduce Ar gas, maintain 1 atmosphere pressure in the Ar atmosphere, raise the temperature to 600°C, then close the Ar gas, and infuse NH in the horizontal tube furnace 3 , and maintained at a temperature of 500 ° C, and maintained at 1 atmospheric pressure, annealed for 4 hours, then passed Ar into the horizontal tube furnace, kept in t...

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Abstract

The present invention provides a magnetic toner, which includes: toner master particles and external additives, the toner master particles at least contain a binder resin and magnetic particles, the magnetic particles include hydrophobized Graphite flakes doped with nitrogen and magnetic iron oxide particles. The magnetic particles in the magnetic toner are uniformly dispersed, stable for long-term use in high-temperature and high-humidity environments, and have high durable developing properties. The obtained magnetic toner has good chargeability and fluidity, and is not easily affected by the environment. It has stable charging performance, can maintain high image density, suppress fogging, and has excellent image reproducibility even if it is used for a long time.

Description

technical field [0001] The present invention relates to a magnetic toner for image formation used in electrophotography and electrostatic charge image development. Background technique [0002] In recent years, in addition to high-definition, high-quality, and high-image quality requirements for image forming devices, high-speed, long-term use, and high reliability are increasingly required. In order to develop high-resolution and high-definition methods, toner particles are developing in the direction of smaller particle size and sharper particle size distribution. However, when only the particle size of the toner is made small, the dispersibility of other internal additives to the binder resin tends to affect the toner. [0003] In particular, the effect of the dispersion state of the magnetic toner contained in the magnetic toner particles in the magnetic toner having magnetic toner particles used in the one-component development system which is advantageous for the mini...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G9/083
Inventor 孙霞
Owner 浙江恒烨新材料科技有限公司
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