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Toner for electrophotography, method for producing same, toner cartridge, and image forming apparatus

A technology of electrophotography and manufacturing method, which is applied in the direction of electric recording technology using charge pattern, equipment and developer using charge pattern electric recording technology, and can solve the problems of poor high temperature resistance offset, poor storage stability of toner, temperature Issues such as narrowing of the area

Active Publication Date: 2020-08-28
KK TOSHIBA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, when a toner containing a crystalline polyester resin is used, the blocking resistance is poor, and the storage stability of the toner may be poor.
In addition, since the viscosity of the toner drops sharply when the toner is melted, the high-temperature offset resistance is poor, and the temperature range that can be fixed may be narrowed.

Method used

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  • Toner for electrophotography, method for producing same, toner cartridge, and image forming apparatus
  • Toner for electrophotography, method for producing same, toner cartridge, and image forming apparatus
  • Toner for electrophotography, method for producing same, toner cartridge, and image forming apparatus

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no. 1 approach

[0012] The electrophotographic toner according to the first embodiment has a crystalline polyester resin content of 25% by mass or more.

[0013] In addition, in the flow tester measurement of the toner for electrophotography, the relationship of the following formula (1) holds.

[0014] 0.3≤(4mm drop temperature-2mm drop temperature) / (2mm drop temperature-beginning outflow temperature)≤1...Formula (1)

[0015] Hereinafter, the toner for electrophotography of this embodiment will be described.

[0016] The electrophotographic toner of this embodiment contains a crystalline polyester resin.

[0017] Examples of the crystalline polyester resin include condensation polymers of polyvalent alcohols and polyvalent carboxylic acids, preferably condensation polymers of divalent alcohols and dicarboxylic acids.

[0018] Examples of divalent alcohols include ethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, and 1,7-heptanediol , 1,8-octanediol, 1,9-no...

no. 2 approach

[0089] The method of manufacturing the electrophotographic toner of the second embodiment is a method of manufacturing the electrophotographic toner of the first embodiment described above.

[0090] The method for producing a toner for electrophotography according to this embodiment includes a toner particle preparation step of preparing toner particles containing the crystalline polyester resin.

[0091] The toner particle preparation step in this embodiment includes an aggregation operation and a fusion operation. Through the coagulation operation, an aggregate containing the crystalline polyester resin and the crosslinking agent can be obtained in an aqueous medium. The aggregate obtained in the above-mentioned aggregation operation is heated at an arbitrary temperature through the above-mentioned fusion operation.

[0092] Hereinafter, the toner particle preparation process of the second embodiment will be described with reference to the drawings.

[0093] figure 1 It i...

no. 3 approach

[0123] The method of manufacturing the electrophotographic toner of the third embodiment is a method of manufacturing the electrophotographic toner of the first embodiment described above.

[0124] The method for producing a toner for electrophotography according to this embodiment includes a toner particle preparation step of preparing toner particles containing the crystalline polyester resin.

[0125] The toner particle preparation step of the present embodiment includes an aggregation operation, a crosslinking promotion operation, and a fusion operation in this order. In an aqueous medium, an aggregate containing the crystalline polyester resin and a crosslinking agent is obtained through the coagulation operation. The crosslinking promotion operation promotes crosslinking between the crystalline polyester resin contained in the aggregate obtained in the aggregation operation and the crosslinking agent. Through the fusion operation, the crosslinked aggregate is heated at ...

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Abstract

A toner includes a crystalline polyester resin in an amount equal to or greater than 25% by mass. The toner satisfies the following formula when the toner is tested using a capillary rheometry measurement during which a pellet of the toner is pressed by a member while being heated: 0.3≦(first temperature−second temperature) / (second temperature−third temperature)≦1, where the first temperature is a temperature at which the member falls 4 mm, the second temperature is a temperature at which the member falls 2 mm, and the third temperature is a temperature at which the member starts to fall.

Description

technical field [0001] The embodiments described herein generally relate to a toner for electrophotography and a method of manufacturing the same, as well as a toner cartridge and an image forming apparatus. Background technique [0002] With the development of energy saving, a toner capable of fixing at a lower temperature than conventional technologies is required. [0003] In this regard, studies on toners with low softening points have been conducted in this field. In addition, toners containing a binder resin having a low glass transition temperature have also been studied. However, when these toners are used, the toners may solidify during storage. [0004] On the other hand, in order to fix the toner at a lower temperature, conventionally, a toner containing a crystalline polyester resin has been proposed. A crystalline polyester resin has high compatibility with a binder resin. [0005] However, when a toner containing a crystalline polyester resin is used, the b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G9/08
CPCG03G9/0821G03G9/0804G03G9/08755G03G9/08793G03G9/08797G03G9/0926G03G15/0865G03G9/0806G03G9/081G03G9/0819
Inventor 占部隆高野太史荒木聪石川淳一吉田麻衣子
Owner KK TOSHIBA
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