Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF1 Cites 9 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Acid valueaaaaaaaaaa
Glass transition pointaaaaaaaaaa
Softening pointaaaaaaaaaa
Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G03G9/12G03G9/135G03G15/10G03G21/10
Inventor 上野芳弘手岛孝大木正启
Owner SEIKO EPSON CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com