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Electrostatic image developing toner and image forming method

An electrostatic image development and toner technology, which is applied in the directions of developers, electrographics, instruments, etc., can solve the problems of low image intensity, insufficient reduction of toner image viscosity, weakened softening effect, etc., to promote softening, Fusing Strength Guaranteed Effect

Active Publication Date: 2020-08-25
KONICA MINOLTA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned proposed method improves the quality of the toner image to a certain extent compared with the conventional method, but there is a problem that the viscosity of the toner image by light irradiation is not sufficiently lowered, and the image strength is slightly low.
[0008] In addition, the above-mentioned published patent documents do not mention the method of limiting the relationship based on the thermal characteristics of the optical phase change material and the bonding resin.
In the methods proposed so far, the optical phase change material exists in the binder resin in a molecularly dispersed state, so even if it is irradiated with light, the softening effect is weakened due to the change of the molecular state, and the image intensity has not been improved.

Method used

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  • Electrostatic image developing toner and image forming method
  • Electrostatic image developing toner and image forming method
  • Electrostatic image developing toner and image forming method

Examples

Experimental program
Comparison scheme
Effect test

Synthetic example 1

[0112]

[0113] For example, as shown in the following reaction formula A, 4-aminophenol and sodium nitrite are reacted under cooling to generate a diazonium salt, which is reacted with o-cresol to synthesize intermediate A (the first stage), and then the n-bromine Hexane reacts with intermediate A to obtain the azobenzene derivative (1).

[0114] [chemical formula 4]

[0115]

[0116] In the reaction formula A, by changing the raw materials used (4-aminophenol, o-cresol, n-bromohexane, etc.) into other compounds, the R represented by the general formula (1) can be obtained. 1 and R 6 Azobenzene derivatives of alkoxy groups. Those skilled in the art can synthesize desired azobenzene derivatives by appropriately making the above modifications. In addition, through the preparation method, an azobenzene derivative having an asymmetric structure can be easily obtained.

Synthetic example 2

[0117]

[0118] As shown in the following reaction formula B, the azobenzene derivative (4) can be obtained by changing o-cresol and n-bromohexane into 2-bromophenol and n-bromododecane, respectively.

[0119] [chemical formula 5]

[0120] Reaction (B)

[0121]

Synthetic example 3

[0122]

[0123] As shown in the following Reaction Formula C, the azobenzene derivative (5) can be obtained by reacting the azobenzene derivative (4) with methanol in the presence of a Pd catalyst and an alkali salt.

[0124] [chemical formula 6]

[0125] (Reaction C)

[0126]

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Abstract

The technical problem of the present invention is to provide an electrostatic image developing toner and an image forming method capable of obtaining a toner image having excellent image intensity ina fixing method based on light irradiation. The invention provides a toner for electrostatic image development. The toner includes at least toner particles. The toner particles contain a binder resinand a light phase change material that changes from a solid state to a liquid state by light irradiation. The toner for electrostatic image development has a heat absorption amount [delta] H1 (J / g) based on the following melting peak of 0.1 or more. The melting is a melting peak derived from an optical phase change material in a first heating process of heating from 25 DEG C to 200 DEG C as determined from a DSC curve of the toner for electrostatic image development measured by differential scanning calorimetry.

Description

technical field [0001] The present invention relates to a toner for electrostatic image development and an image forming method. More specifically, it relates to a toner for electrostatic image development and an image forming method for obtaining a toner image having excellent image strength in a fixing system by light irradiation. Background technique [0002] A conventionally known image forming apparatus of an electrophotography method develops an electrostatic latent image formed on a photoreceptor with a toner to form a toner image, transfers the formed toner image to paper, and transfers the transferred image to paper. The printed toner image is heated and fixed, thereby forming an image on paper. In the image forming apparatus as described above, in order to fix the toner image on the paper by heating and fixing, it is first necessary to heat the toner to a high temperature to melt it. Therefore, the effect on realizing energy saving is limited. [0003] In recent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/08G03G9/087
CPCG03G9/08G03G9/087G03G9/08795G03G9/08797
Inventor 高桥圣二郎须釜宏二堀口治男草野优咲子芝田豊子
Owner KONICA MINOLTA INC