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Liquid developer and image forming method

A developer and liquid technology, applied in the directions of developer, electrography, optics, etc., can solve the problem of consuming large heat energy or light energy, and achieve the effect of reducing consumption

Inactive Publication Date: 2017-04-12
KYOCERA DOCUMENT SOLUTIONS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the heat fixing method and the light fixing method, in order to fix the colored particles on the recording medium, it is necessary to consume a large amount of thermal energy or light energy.

Method used

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  • Liquid developer and image forming method
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  • Liquid developer and image forming method

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0016] Embodiment 1 of the present invention relates to a liquid developer. The liquid developer according to Embodiment 1 contains an electrically insulating carrier liquid, colored particles, and an organic polymer compound. The organic macromolecular compound is dissolved in the carrier liquid and includes elastomer A and elastomer B, the elastomer A is a styrene-butadiene elastomer without acid groups or basic groups, and the elastomer B is a styrene-butadiene elastomer with Acid-based or basic-based styrenic elastomers. The colored particles contain nigrosine. The content of the elastomer A in the liquid developer is not less than 6% by mass and not more than 8% by mass. The content of the elastomer B in the liquid developer is not less than 0.4% by mass and not more than 0.8% by mass. The carrier liquid may contain desired components such as a dispersant.

[0017] In the case of a combination of the binder resin contained in the colored particles and the carrier liqu...

Embodiment approach 2

[0081] Embodiment 2 of the present invention relates to an electrophotographic image forming method based on a wet method among developing methods, and the image forming method uses the liquid developer according to Embodiment 1. The image forming method according to Embodiment 2 includes a charging step, an exposure step, a development step, a transfer step, and a discharge step. The charging step is a step of charging the surface of the photosensitive drum. The exposure step is a step of forming an electrostatic latent image on the surface of the charged photosensitive drum. The development step is a step of making the electrostatic latent image on the surface of the photosensitive drum visible using a liquid developer. The transfer step is a step of transferring the developed image onto a recording medium. The discharging step is a step of discharging the recording medium on which the image is transferred to the discharging unit.

[0082] Hereinafter, an image forming me...

Embodiment 1～12、 and comparative example 1～21

[0139] (preparation of materials)

[0140] Using a stirrer ("ROBOMIX" manufactured by PRIMIX Co., Ltd.), under the condition of a stirring speed of 8000 rpm, the amount of nigrosine (Toda Kogyo Co., Ltd.) described in Tables 3 to 7, Elastomer A solution and elastomer B solution were mixed for 5 minutes to prepare materials.

[0141] (Preparation of liquid developer)

[0142] The obtained material was subjected to wet pulverization for 120 minutes at a drive frequency of 50 Hz using a roller mill ("RM-10" manufactured by Seiwa Technology Co., Ltd.), to obtain a liquid developer. Obtain the volume average particle diameter (D 50 ) is about 0.5 μm. The volume average particle diameter of colored particles (D 50 ) is measured according to the following method. Record the measurement results in Tables 3-7.

[0143] 50 ) measurement method>

[0144] 0.5 g of the sample and 50 g of carrier liquid A (liquid paraffin, Moresco White (registered trademark) P55 (manufactured by Mor...

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Abstract

A liquid developer includes a carrier liquid having insulation property, colored particles, and an organic high molecular compound. The organic high molecular compound is dissolved in the carrier liquid. The organic high molecular compound includes elastomer A that is a styrene-butadiene-based elastomer not having an acid group or a basic group and elastomer B that is a styrene-based elastomer having an acid group or a basic group. A content of the elastomer A in the liquid developer is 6% by mass or more and 8% by mass or less, and a content of the elastomer B in the liquid developer is 0.4% by mass or more and 0.8% by mass or less. The colored particles include aniline black.

Description

technical field [0001] The present invention relates to a liquid developer and an image forming method using the liquid developer. Background technique [0002] In general, a developing method for visualizing an electrostatic latent image using charged colored particles is mainly divided into a dry developing method and a wet developing method according to the form of the developer. Among them, in the wet developing method, a liquid developer in which colored particles are dispersed in an electrically insulating carrier liquid is used. The charged colored particles in the liquid developer use the principle of electrophoresis to move from the surface of the developing roller to the surface of the photosensitive drum, so that the electrostatic latent image on the surface of the photosensitive drum appears. The resulting image is transferred from the photosensitive drum to the recording medium. Since the coloring particles in the liquid developer are less likely to be scatter...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G9/12
CPCG03G9/131G03G9/122
Inventor 长西克树
Owner KYOCERA DOCUMENT SOLUTIONS INC