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Electrostatic latent image developing toner, developer and method of producing the electrostatic latent image developing toner

A technology for electrostatic image development and toner, which is applied in the direction of developer, electrography, and instruments, and can solve the problems of toner loss elastic modulus and stoppage that have not yet been raised

Active Publication Date: 2006-03-29
FUJIFILM BUSINESS INNOVATION CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these inventions are limited to improvement of color developing ability / OHP transmittance, and no method for controlling loss elastic modulus of toner using a colorant has been proposed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0101] -Preparation of dispersion liquid-

[0102] Not only resin particles, colorant particles, and release agent particles may be dispersed in the above-mentioned dispersion liquid, but other particles may also be dispersed in the above-mentioned dispersion liquid. The above-mentioned dispersion liquid can be prepared by appropriately adding and mixing resin particles, colorant particles, release agent particles, and other particles to a dispersion medium, or by appropriately adding and mixing a resin particle dispersion liquid in which resin particles are dispersed, coloring. The above-described preparation is accomplished by using a dispersion liquid of agent particles (in which the colorant particles are dispersed), a dispersion liquid of the release agent particles (in which the particles of the release agent are dispersed), and a dispersion liquid of other particles (in which the other particles are dispersed).

[0103] (dispersion medium)

[0104] An aqueous medium ca...

Embodiment 1

[0212] -Production of Toner Master Particles (1)-

[0213] Crystalline polyester resin dispersion (1) 700 parts by mass

[0214] Colorant dispersion liquid (1) 60 parts by mass

[0215] Release agent dispersion (1) 60 parts by mass

[0216] 3 parts by mass of sodium sulfate

[0217] A stainless steel round-bottom flask was charged with the above components, and then 14 parts by mass of a 10% nitric acid aqueous solution of polyaluminum chloride as a coagulant was added thereto. The mixture was then dispersed using a homogenizer (trade name: Ultratalax T50, manufactured by IKA), and then heated to 58°C in a hot oil bath. The volume average particle diameter of the obtained aggregated particles was 5.5 μm.

[0218] This aggregated particle dispersion liquid was kept at 58° C. for 30 minutes, and then 120 parts by mass of the resin particle dispersion liquid (1) was gradually added to the aggregated particle dispersion liquid. The temperature of the hot oil bath was raised to ...

Embodiment 2

[0220] -Preparation of Toner Master Particles (2)-

[0221] Crystalline polyester resin dispersion (2) 700 parts by mass

[0222] Colorant dispersion liquid (1) 30 parts by mass

[0223] Colorant dispersion liquid (2) 30 parts by mass

[0224] Release agent dispersion (1) 60 parts by mass

[0225] 3 parts by mass of sodium sulfate

[0226] Fused particles having a volume average particle diameter (D50%) of 6.5 μm were obtained in substantially the same manner as in Example 1, except that the above-mentioned dispersion liquid was used as a raw material.

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PUM

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Abstract

The present invention provides an electrostatic image developing toner comprising a binder resin, a colorant and a releasing agent, the toner having a temperature interval in which the value of loss elastic modulus varies 100 times or more within a temperature range of 10 DEG C. in the temperature interval between 60 and 95 DEG C. under measuring conditions of an angular frequency of 6.28 rad / sec and a temperature rise rate of 1 DEG C. / min, wherein the loss elastic modulus G'' is 5x103 Pa or more and 5x104 Pa or less and the tangential loss is 1.5 or more and 3.0 or less in a temperature range from 100 DEG C. to 140 DEG C. under a measuring condition of a temperature change rate of 1 DEG C. / min.

Description

technical field [0001] The present invention relates to a toner for developing electrostatic images capable of forming images with high gloss using reduced energy, and which is preferably used when forming images by, for example, an electrophotographic method, the present invention also relates to A developer using the toner for development and a method for efficiently producing a toner for developing an electrostatic image. Background technique [0002] Conventionally, an electrophotographic method is generally used when an image can be formed by, for example, a copier or a laser beam printer. As developers used in electrophotographic methods, two-component system developers containing toner particles and carrier particles and one-component system developers containing magnetic toner particles or non-magnetic toner particles are known. The toner particles in the developer are usually produced by a kneading pulverization method. In this kneading and pulverizing method, a t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/08G03G9/00
CPCG03G9/08728G03G9/08797G03G9/0819G03G9/08782G03G9/08795G03G9/0812G03G9/08733G03G9/08755G03G9/09G03G9/0926G03G9/0821G03G9/08791G03G9/08
Inventor 二宫正伸石山孝雄滨野弘一福岛纪人川上荣治藤本隆
Owner FUJIFILM BUSINESS INNOVATION CORP