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Electrostatic image developing toner particles and developer

An electrostatic image development and toner technology, which is applied in the directions of developers, electrographics, instruments, etc., can solve the problems of difficult toner particles, unstable dispersion state, uncertain shape, etc., and achieve excellent development stability, The effect of excellent low temperature fixability

Active Publication Date: 2013-09-04
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Conventional kneading and pulverization methods have difficulties in producing toner particles for developing electrostatic images (hereinafter also simply referred to as "toner particles") having a small particle diameter.
Toners produced by the kneading pulverization method have various problems that their shape is indeterminate, have a wide particle size distribution, and require high energy for fixing
However, the dispersed state is unstable, which is not satisfactory

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0062] (1) Preparation of toner samples

[0063] In a laboratory controlled at 25°C and 55%RH, weigh 15g of toner and place it at 50cm 3 into a sample vial (eg, trade name "SV-50", product of NICHIDEN-RIKA GLASS CO., LTD.), and then the vial is closed with a cap. The sample bottle was passed through a YAYOI shaker (model: YS-LD, product of YAYOI CO., LTD.) at 2.5S -1 Shake for 5 minutes. Here, the shaker is adjusted so that its legs move forward 15 degrees and backward 20 degrees (when the shaker's directly above position (vertical) is considered 0 degrees). The vial was fixed to a fixing holder (holder) attached to the end of the post (the cap of the vial was fixed to the center of the post and its extension). After shaking, the sample bottle was carefully removed so that the compacted toner did not break.

[0064] Next, the capped vial was stored for 1.5 hours in a high temperature bath controlled at 50°C or an environmental chamber controlled at 50°C (for example, "THER...

Embodiment

[0257] Next, the present invention will be described in more detail by way of examples, which should not be construed as limiting the present invention thereto. In the following examples, the unit "part" means "part by mass".

[0258] -Synthesis of Crystalline Polyester Resin 1-

[0259] Add 1,10-sebacic acid (2,120 g), 1,8-octanediol (1,000 g), 1,4- Butylene glycol (1,520 g) and hydroquinone (3.9 g) were then reacted at 180° C. for 10 hours. After that, the reaction mixture was reacted at 200° C. for 3 hours and further reacted at 8.3 kPa for 2 hours, whereby Crystalline Polyester Resin 1 was produced. Crystalline polyester resin 1 thus produced was found to have a melting point of 67° C. as measured by the method described above.

[0260] -Synthesis of Crystalline Polyester Resin 2-

[0261] Into a 5 L four-necked flask equipped with a nitrogen introduction tube, a drain tube, a stirrer and a thermocouple were charged 1,12-dodecanediol (2,500 g), 1,8-suberic acid (2,330 ...

Embodiment 2

[0309] The procedure of Example 1 was repeated except that [Crystalline Polyester Dispersion Liquid 1] was changed to [Crystalline Polyester Dispersion Liquid 2], thereby obtaining [Toner 2]. [Toner 2] was found to have: a Tg of 45° C., and an inter-toner particle adhesion of 1.4 mN measured after it had been stored at a high temperature.

[0310] Note that the emulsified slurry, dispersed slurry, and base toner obtained in Example 2 are referred to as [emulsified slurry 2], [dispersed slurry 2], and [base toner 2], respectively.

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Abstract

Electrostatic image developing toner particles including: a crystalline polyester resin; a non-crystalline polyester resin; a releasing agent; and a colorant, wherein the electrostatic image developing toner particles have a glass transition temperature of 40 DEG C to 60 DEG C where the glass transition temperature is measured with a differential scanning calorimeter (DSC), and wherein the electrostatic image developing toner particles have an adhesive force between the toner particles of 1.4 mN to 2.2 mN where the adhesive force between the toner particles is measured after the electrostatic image developing toner particles have been stored at 50 DEG C.

Description

technical field [0001] The present invention relates to toners and developers for electrostatic image development. Background technique [0002] In the recent market, toners for developing electrostatic images have been required to have smaller particle diameters to output higher-quality images, and to have improved low-temperature fixability to save energy. [0003] Conventional kneading and pulverization methods have difficulties in producing electrostatic image developing toner particles (hereinafter also simply referred to as "toner particles") having a small particle diameter. Toners produced by the kneading pulverization method have various problems that their shape is indefinite, have a wide particle size distribution, and require high energy for fixing. They are cracked at the interface of the release agent (wax) by pulverization, and thus a large amount of wax exists on the surface of the toner. Although the toner has a satisfactory release effect due to the wax, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/087G03G9/08
CPCG03G9/0804G03G9/0806G03G9/0821G03G9/0823G03G9/08786G03G9/08788G03G9/08791G03G9/08793G03G9/08795G03G9/08797G03G9/08755
Inventor 本多隆浩内野仓理粟村顺一小川哲小岛智之草原辉树井上大佑伊藤大介长友庸泰渡边政树
Owner RICOH KK
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