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Liquid developer and image forming apparatus

A developer and liquid technology, applied in the direction of developer, electric recording technology using charge pattern, equipment for electric recording process using charge pattern, etc., can solve the problem of inability to obtain charging characteristics, agglomeration of toner particles, and difficulty in obtaining Positive charging characteristics and other issues

Inactive Publication Date: 2009-07-15
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in the liquid developer described in Patent Document 1, the initial dispersibility of the toner particles is good, but the toner particles aggregate over time, making it difficult to maintain the dispersibility over a long period of time.
In addition, in conventional liquid developers, sufficient charging characteristics cannot be obtained, and in particular, it is difficult to obtain positive 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

[0258] First, toner particles are produced. In addition, the process which did not describe the temperature was performed at room temperature (25 degreeC).

[0259]

[0260] (Preparation of colorant mother liquor solution)

[0261] First, polyester resin (acid value: 10 mgKOH / g, glass transition temperature (Tg): 55° C., softening point: 107° C.): 60 parts by weight was prepared as a resin material.

[0262] Next, a mixture (mass ratio: 50:50) of the above-mentioned resin material and a cyan-based pigment (manufactured by Dainichi Seika Co., Ltd., pigment blue: 15:3) as a colorant was prepared. Mixing was performed using a 20 L type Henschel mixer to obtain a raw material for toner production.

[0263] Next, this raw material (mixture) is kneaded using a twin-screw kneading extruder. The kneaded product extruded from the extrusion port of the twin-screw kneading extruder is cooled.

[0264] The kneaded product cooled as described above is coarsely pulverized to obtain a ...

Embodiment 2

[0284] As the rosin-based resin, rosin-modified maleic resin (manufactured by Arakawa Chemical Industry Co., Ltd., trade name "Marugid No. 1", acid value: 25 mgKOH / g or less, softening point: 120 to 130, weight average molecular weight: 3100) was used. , except that, liquid developers corresponding to each color were produced in the same manner as in Example 1.

Embodiment 3

[0286] As the rosin-based resin, a rosin-modified phenol resin (manufactured by Arakawa Chemical Industry Co., Ltd., trade name "KG2212", acid value: 22 mgKOH / g or less, softening point: 172-182, weight-average molecular weight: 100000) was used. In addition, Liquid developers corresponding to the respective colors were manufactured in the same manner as in Example 1 above.

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Abstract

The invention provides a liquid developer with electropositive character superiority, toner particle long-term dispersible superiority; in addition, the invention also provides an image forming device using the liquid developer. The liquid developer of the invention comprises an insulation liquid, the toner particles and dispersant. The surface of the toner particle is at least coated with a rosin resin; the dispersant has amine value; the amine value of the dispersant is preferably selected as 1-100 mg KOH / g. The content of the dispersant is 0.2-10 weight part as to the 100 weight part of the toner particles. The sintering point of the rosin resin is preferably selected as 80-190 centigrade.

Description

technical field [0001] The present invention relates to a liquid developer and an image forming device. Background technique [0002] As a developer used for developing an electrostatic latent image formed on a latent image carrier, it is known that a toner composed of a material containing a colorant such as a pigment and a binder resin is dispersed in an electrically insulating carrier liquid. (insulating liquid) liquid developer. [0003] Conventionally, resin materials such as polyester resins, styrene-acrylate copolymers, and epoxy resins are generally used for toner particles constituting such liquid developers. Such a resin material is characterized in that it is easy to handle, the color rendering property of the obtained image is good, and high fixing properties can be obtained. [0004] However, in conventional liquid developers, the resin material constituting the toner particles has low affinity with the insulating liquid, and it is difficult to sufficiently in...

Claims

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Application Information

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IPC IPC(8): G03G9/12G03G15/01G03G15/16
Inventor 大木正启手岛孝
Owner SEIKO EPSON CORP
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