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Liquid developer

A developer and liquid technology, applied in the direction of developer, electrography, optics, etc., can solve the problems of lower printing quality and lower resistance of liquid developer.

Pending Publication Date: 2020-08-07
KAO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the resistance of the liquid developer decreases, resulting in a decrease in print quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0028] According to the first aspect of the present invention, it is possible to provide a liquid developer capable of reducing the particle size of toner particles, and further having low viscosity and high electrical resistance.

[0029] According to the second aspect of the present invention, it is possible to provide a liquid developer capable of reducing the particle size of toner particles and having a low viscosity, and furthermore, the liquid developer has excellent fixability to a polypropylene film.

[0030] [liquid developer]

[0031] The liquid developer of the present invention (hereinafter also simply referred to as "liquid developer") contains toner particles containing a colorant and polyester-based resin (hereinafter also simply referred to as "polyester resin") and an insulating liquid. Binder resin for resin A").

[0032] The polyester-based resin A contains a structural unit derived from an alcohol component and a structural unit derived from a carboxylic ...

no. 1 approach

[0033] According to the above configuration, it is possible to obtain a liquid developer capable of reducing the particle size of the toner particles (hereinafter also simply referred to as "small particle size reduction") and further reducing the viscosity (hereinafter also simply referred to as "low viscosity"). , the liquid developer has a high resistance (hereinafter also simply referred to as "high resistance") or has excellent fixability to a polypropylene film. In particular, according to the first embodiment of the present invention, it is possible to obtain a liquid developer capable of reducing the particle diameter of toner particles, further having low viscosity and high electrical resistance.

[0034] In addition, according to the second embodiment of the present invention, the liquid developer can achieve a small particle size and low viscosity of the toner particles, and in addition, it can improve the fixability of the polypropylene film (hereinafter also referr...

Embodiment

[0258] Hereinafter, although an Example demonstrates this invention concretely, this invention is not limited to these Examples at all. The physical properties of the resin and the like were measured by the following methods.

[0259] [test methods]

[0260] 〔Resin weight average molecular weight (Mw)〕

[0261] The weight average molecular weight was calculated|required by the gel permeation chromatography (GPC) method by the following method.

[0262] (1) Preparation of sample solution

[0263] The sample was dissolved in tetrahydrofuran at 40° C. so as to have a concentration of 0.5 g / 100 mL. Next, this solution was filtered using a polytetrafluoroethylene (PTFE) membrane filter "DISMIC-25JP" (manufactured by Toyo Filter Paper Co., Ltd.) with a pore size of 0.20 μm to remove insoluble components to prepare a sample solution.

[0264] (2) Molecular weight determination

[0265] Using the following measurement device and analytical column, tetrahydrofuran was circulated a...

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PUM

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Abstract

A liquid developer contains an insulating liquid and toner particles containing a coloring agent and a binder resin that includes a polyester resin. The polyester resin contains a structural unit derived from an alcohol component and a structural unit derived from a carboxylic acid component. The toner particles contain an acid-modified product A of a C3-18 alpha-olefin polymer.

Description

technical field [0001] The present invention relates to a liquid developer used for developing a latent image formed, for example, in electrophotography, electrostatic recording, electrostatic printing, or the like. Background technique [0002] As a developer for electrophotography, a liquid developer in which toner particles made of a material containing a colorant and a binder resin are dispersed in an insulating liquid is known. Since the liquid developer can reduce the particle size of the toner, it is excellent in terms of image quality. [0003] In general, a dispersant is used in a liquid developer as a material for dispersing toner particles in an insulating liquid. However, since the toner particles and the dispersant are adsorbed by non-covalent interaction, if the adsorption force is weak, there will be unadsorbed dispersant. As a result, the resistance of the liquid developer decreases, resulting in a decrease in printing quality. [0004] Japanese Unexamined...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/13G03G9/135
CPCG03G9/132G03G9/122G03G9/125G03G7/008G03G9/131G03G9/133
Inventor 山本泰辉若林裕树
Owner KAO CORP