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Electrostatic image developing toner and developer

A technology for electrostatic image development and toner, which is applied in the direction of developer, electrography, instrument, etc., can solve the problem of the heat-resistant storage of toner, and achieve the effect of high image density

Pending Publication Date: 2020-05-22
KONICA MINOLTA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if there is a portion where the crystalline resin and the amorphous resin are compatible in the stage before the fixing process, that is, when it exists as toner particles, the heat-resistant storage property of the toner may be lowered.

Method used

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  • Electrostatic image developing toner and developer
  • Electrostatic image developing toner and developer

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0112] (Sample preparation method)

[0113] After adding 3 parts by mass of the prepared toner to 35 parts by mass of a 0.2% aqueous solution of polyoxyethylphenyl ether and dispersing it, ultrasonic treatment (manufactured by Nippon Seiki Seiki Co., Ltd., US-1200T) was performed for 5 minutes at 25°C. , the external additive is removed from the surface of the toner particle to obtain a toner matrix particle for observation.

[0114] Then, 1 to 2 mg of the obtained toner base particles were put into a 10 mL sample bottle, dispersed in a photocurable resin "D-800" (manufactured by JEOL Ltd.), and photocured to form lumps. Then, in the following ruthenium tetroxide (RuO 4 ) under steam dyeing conditions, the prepared block was dyed, and then, using a microtome equipped with diamond teeth, a thickness of ultrathin samples.

[0115] (Ruthenium tetroxide staining conditions)

[0116] Ruthenium tetroxide (RuO 4 ) staining. According to the order of the device, ruthenium tetro...

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PUM

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Abstract

The present invention provides a toner and developer for developing electrostatic images that can obtain low-temperature fixability and high image density. The electrostatic image developing toner includes toner base particles, wherein the toner base particles contain: an amorphous polyester resin; a crystalline resin; and o-acetoacetaniside, and the content of the o-acetoacetaniside in the tonerbase particles is 0.1 ppm by mass or more and 200 ppm by mass or less.

Description

technical field [0001] The present invention relates to a toner for developing an electrostatic image containing a crystalline resin and an amorphous resin, and a developer containing the toner for developing an electrostatic image. Background technique [0002] In an electrophotographic image forming apparatus, toner for electrostatic image development (hereinafter simply referred to as toner) is formed on a transfer medium such as paper to form an image, and then fixed. As a fixing method, a heat roller fixing method in which a transfer medium after image formation is passed between a heat roller and a pressure roller is widely used. [0003] In recent years, in electrophotographic image forming apparatuses, demands for energy saving have been fulfilled from the viewpoint of reducing environmental loads. Therefore, in order to fix the toner with a small amount of energy, toners capable of lowering the fixing temperature are being developed. As a typical method of lowerin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/08G03G9/087
CPCG03G9/0821G03G9/08755G03G9/08795G03G9/08797G03G9/09775G03G9/0804G03G9/16
Inventor 萱森隆成松原政治舍川直哉饭冈淳
Owner KONICA MINOLTA INC