Liquid developer and image forming apparatus

A developer and liquid technology, applied in the direction of developer, electrical recording process applying charge pattern, equipment for electrical recording process applying charge pattern, etc.

Inactive Publication Date: 2009-09-23
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in conventional liquid developers, when a dispersant is added to the liquid developer, the dispersibility of the toner particles is improved, but there is a problem that the charging characteristics are lowered.
In addition, it is also considered to add a charge control agent represented by metal soap to improve the charge characteristics, but the difficulty is that in the case of using a charge control agent such as metal soap, the insulation of the insulating liquid will be reduced, and instead It will reduce the charging characteristics

Method used

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  • Liquid developer and image forming apparatus
  • Liquid developer and image forming apparatus
  • Liquid developer and image forming apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0255] First, production of toner particles is performed. In addition, the process which does not describe the temperature was performed at room temperature (25 degreeC).

[0256]

[0257] (Preparation of coloring liquid mixture (master) solution)

[0258] First, a polyester resin (manufactured by Dainippon Kogyo Co., Ltd., trade name "DL-90", acid value: 10 mgKOH / g, glass transition point: 46.3°C, softening point: 95.0°C) and a cyan pigment as a colorant were prepared (Dainichi Seika Co., Ltd., pigment blue 15:3) mixture (mass ratio 50:50). These components were mixed using a 20 L-type Henschel mixer to obtain a raw material for toner production.

[0259] Next, this raw material (mixture) is kneaded using a two-way kneading extruder. Cool the kneaded product extruded from the extrusion port of the bidirectional kneading extruder.

[0260] The kneaded product cooled as described above is coarsely pulverized to obtain a powder having an average particle diameter of 1.0 mm...

Embodiment 2～5

[0280] Except having changed content of a charge control agent as shown in Table 1, it carried out similarly to the said Example 1, and manufactured the liquid developer corresponding to each color.

Embodiment 6

[0282] Except having used SOLSPERSE 11200 (manufactured by Lubrizol Corporation) as a dispersant, it carried out similarly to the said Example 1, and manufactured the liquid developer corresponding to each color.

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Abstract

The invention provides a liquid developer having both superior dispersibility and a charge characteristic of toner particles, and further an image forming apparatus using the same. The liquid developer is characterized by comprising an insulation liquid, a dispersant dissolved in the insulation liquid, a dispersant, and a charge control agent represented by the following chemical formula (I), wherein R1 represents an alkyl group or alkenyl group having a carbon number in the range of 8 to 22, and R2 represents a hydroxyalkyl group. It is preferred that a polymer dispersant having a 12-hydroxystearic skeleton is selected as the dispersant, and R2 represents a hydroxyalkyl group having a carbon number from 1 to 4.

Description

technical field [0001] The invention relates to a liquid developer and an image forming device. Background technique [0002] As a developer used to develop an electrostatic latent image formed on a latent image carrier, it is known that a colorant such as a pigment and toner particles composed of a material containing a binder resin are dispersed on an electrically insulating carrier. A liquid developer made of liquid (insulating liquid). [0003] Such liquid developers generally use polyester resins. The polyester resin is characterized by high transparency, and when used as a binder resin, the color rendering property of the obtained image is excellent, and also high fixing properties can be obtained. [0004] However, in general, a dispersant is added to a liquid developer in order to improve the dispersibility of toner particles (for example, refer to Patent Document 1). [0005] However, in conventional liquid developers, when a dispersant is added to the liquid dev...

Claims

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Application Information

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IPC IPC(8): G03G9/12G03G9/135G03G15/10G03G21/10
Inventor 上野芳弘手岛孝大木正启
Owner SEIKO EPSON CORP
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