Toner, toner-housing unit, and image-forming apparatus

A technology of toner and electrostatic latent image, which is applied in the direction of developer, electrography, optics, etc. It can solve the problems of toner cracking, insufficient toner stress resistance, insufficient stress resistance, etc., and achieve stress resistance excellent effect

Inactive Publication Date: 2018-11-09
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, according to the technique disclosed in PTL 1, the stress resistance of the toner is insufficient and cannot solve the problem that cracking of the toner occurs when the toner is used in a one-component developing system
[0005] As described above, toners known in the art may have excellent fixability (low temperature fixability and hot offset resistance), but insufficient stress resistance
Therefore, the toner known in the art has a problem that quality-related problems such as blade sticking and filming to the photoreceptor due to toner cracking tend to occur

Method used

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  • Toner, toner-housing unit, and image-forming apparatus
  • Toner, toner-housing unit, and image-forming apparatus
  • Toner, toner-housing unit, and image-forming apparatus

Examples

Experimental program
Comparison scheme
Effect test

manufacture Embodiment 1

[0166]

[0167] To a 4-neck round bottom flask having a volume of 1 L and equipped with a thermometer, a stirrer, a condenser and a nitrogen introduction tube, each component listed in Table 1 and Table 2 was added, respectively. The flask was then placed in a heating mantle, and then heated while the inner atmosphere of the flask was kept as an inert atmosphere by introducing nitrogen gas through a nitrogen gas introduction tube. Subsequently, 0.05 parts by mass of dibutyltin oxide was added and the resulting mixture was reacted while maintaining the temperature at 200° C., thereby obtaining the polyester resins listed in Table 1 and Table 2, respectively.

[0168]

[0169] The obtained polyesters were respectively subjected to the following measurements.

[0170] -Measurement of Molecular Weight (GPC)-

[0171] Gel permeation chromatography (GPC) was performed under the following conditions.

[0172] Device: GPC-150C (obtained from Waters)

[0173] · Column: KF801-807...

Embodiment 1-1

[0189] After a mixture having the following composition was thoroughly mixed in a Henschel mixer, the resultant was heated and melted at a temperature of 130° C. to 140° C. for about 30 minutes by means of a roll mill. After cooling the resultant to room temperature, the obtained kneaded product is pulverized by means of a jet mill or a mechanical pulverizer and classified by means of an air classifier to obtain toner mother particles.

[0190] -composition-

[0191] Polyester resin A-1: ​​50 parts

[0192] Polyester resin B-1: 50 parts

[0193] Rice wax (TOWAX-3F16, which is available from TOAKASEI CO., LTD.): 5 parts

[0194] Carbon black (#44, which is available from Mitsubishi Chemical Corporation): 10 parts

[0195] Metal-containing azo compound (T-77, available from Hodogaya Chemical Co., Ltd.): 1 part

[0196] To the obtained toner mother particles, 0.5% by mass of hydrophobic silica was added to obtain [Toner 1-1].

Embodiment 1-2

[0198] [Toner 1-2] was obtained in the same manner as in Example 1-1, except that [Polyester Resin B-1] was changed to [Polyester Resin B-2].

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Abstract

Provided is a toner that contains a binder resin, wherein: the toner contains 10-40 mass% of THF-insoluble components; the molecular weight distribution, as determined by gel permeation chromatography(GPC), of THF-insoluble components in the toner has a main peak within the range 10,000-16,000; the half value width of the main peak is a molecular weight of 60,000-90,000; and of THF-insoluble components in the toner, components having molecular weights of 2000 or less, as determined by GPC, are contained at a content of 15.0-25.0 mass% and components having molecular weights of 100,000 or moreare contained at a content of 10.0 mass% or less.

Description

technical field [0001] The present invention relates to a toner, a toner storage unit, and an image forming apparatus (image forming apparatus). Background technique [0002] Recently, there is a tendency that, for a printing machine (printer) of a one-component development system, a smaller size and a longer service life are desired. In addition, low-temperature fixing has been achieved. As the above-mentioned properties have been developed, it is an urgent task to secure improvement in stress resistance of toner and excellent toner fixability. [0003] PTL 1 discloses a toner for electrostatic development, wherein the toner includes at least a binder resin, a colorant, and a release agent, the penetration of THF-soluble components of the toner (mainly the binder resin) through gel The molecular weight distribution measured by chromatography (GPC) has a main peak between 1,000 and 10,000, the half width of the molecular weight distribution is 15,000 or less, and the toner...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/087G03G9/08G03G9/097
CPCG03G9/08755G03G9/08782G03G9/08795G03G9/08797G03G9/091
Inventor 小川哲关匡宏关口良隆守屋彻
Owner RICOH KK
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