Toner and method for producing toner

A production method and technology of toner, which is applied in the field of toner, can solve the problem of toner contamination of fixing devices, etc., and achieve the effect of high and low temperature fixability

Pending Publication Date: 2022-04-22
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, the present inventors conducted intensive research on the toner disclosed in Japanese Patent Laid-Open No. 2014-130243 and found that the toner may sometimes contaminate the fixing device

Method used

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  • Toner and method for producing toner
  • Toner and method for producing toner
  • Toner and method for producing toner

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0278] Toner 1 was evaluated in the following manner. The evaluation results are shown in Table 4.

[0279] Evaluation of Low-Temperature Fixability of Toner

[0280] Evaluation of low-temperature fixability A modified machine of a color laser printer (HP Color LaserJet3525dn manufactured by HP Inc.) was used as an image forming apparatus and white paper (Office Planner manufactured by CANON KABUSHIKI KAISHA; 64 g / m 2 ) as an evaluation paper. The image forming apparatus is modified to make the fixing temperature and process speed variable and to make the fixing unit detachable.

[0281] First, the fixing unit is detached from the image forming apparatus, and the toner is taken out of the black cartridge. Toner 1 (amount of 100 g) was loaded into the cartridge.

[0282] Subsequently, using the loaded toner 1, an unfixed toner image of 2.0 cm long and 15.0 cm wide was formed on the evaluation paper at a portion 1.0 cm from the top end in the paper passing direction (toner l...

Embodiment 2 to 12

[0292] Toners 2 to 12 were evaluated in the same manner as in Example 1. The evaluation results are shown in Table 4.

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Abstract

The invention relates to a toner and a method for producing the toner. The toner includes a toner particle containing a resin component including a crystalline resin and an amorphous resin. In a cross-sectional view of the toner particle, a domain-matrix structure containing a matrix containing a crystalline resin and a domain containing an amorphous resin is observed. The maximum endothermic peak temperature Tm of the toner as measured by DSC is 50 DEG C to 80 DEG C. When a storage elastic modulus of the toner at a temperature 5 DEG C lower than Tm is G '(-5) (Pa) and a storage elastic modulus of the toner at a temperature 5 DEG C higher than Tm is G' (+ 5) (Pa), G '(-5) and G' (+ 5) satisfy inequality (1): G '(-5) / G' (+ 5) > = 50... (1), and when a maximum loss tangent of the toner in a temperature range of 50 DEG C to 130 DEG C is tan [delta] (Max), tan [delta] (Max) satisfies inequality (2): 0.0 < = tan [delta] (Max) < = 1.50... (2).

Description

technical field [0001] The present disclosure relates to a toner for an electrophotographic image forming apparatus. Background technique [0002] Demands for energy-saving measures for electrophotographic image forming apparatuses have recently been increasing. As such an energy-saving measure, a technique of fixing toner at a low temperature to reduce power consumption during the fixing process has been studied. [0003] In order to improve the low-temperature fixability of the toner, for example, the glass transition point of the binder resin of the toner may be lowered. However, since lowering the glass transition point of the binder resin leads to lowering of the heat-resistant storage stability of the toner, it is difficult to achieve both low-temperature fixability and heat-resistant storage stability of the toner by this method. [0004] Therefore, the use of crystalline resins for toners has been studied to achieve both low-temperature fixability and heat-resistan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/08G03G9/087
CPCG03G9/08G03G9/08722G03G9/08755G03G9/0802G03G9/081G03G9/08795G03G9/08797G03G9/0825G03G9/08711G03G9/08728
Inventor 秋山弘贵渡边俊太郎香川浩辉森部修平
Owner CANON KK
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