Toner for developing electrostatic charge image

A manufacturing method and technology of toner, applied in the field of toner, can solve the problems of insufficient charging performance, stability and durability of toner, insufficient durability, and unsatisfactory image stability, etc., to achieve Effects of high durability, stable chargeability, and excellent image stability

Inactive Publication Date: 2016-11-16
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Unfortunately, the toner has insufficient stability and durability of charging performance under severe environments
In particular, if the toner is used for printing at a higher process speed, durability after outputting a large amount of printed matter in a high-temperature and high-humidity environment is insufficient and image stability is not satisfactory

Method used

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  • Toner for developing electrostatic charge image
  • Toner for developing electrostatic charge image
  • Toner for developing electrostatic charge image

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0230] Now, the present invention will be specifically described by way of examples, but the present invention will not be limited to these examples. "Parts" means "parts by mass".

[0231]

[0232] (step 1)

[0233] 2,5-Dihydroxybenzoic acid (100 g) and 80% sulfuric acid (1441 g) were heated to 50° C. and mixed. Tert-butanol (144 g) was added to the dispersion, and stirred at 50° C. for 30 minutes. Then, the operation of adding tert-butanol (144 g) to the dispersion liquid followed by stirring for 30 minutes was performed three times. The reaction solution was cooled to room temperature, and poured slowly into ice water (1 kg). The precipitate was filtered and washed with water and then with hexane. The precipitate was dissolved in methanol (200 mL), and reprecipitated in water (3.6 L). After filtration, the reaction product was dried at 80° C., thereby preparing a salicylic acid intermediate (74.9 g) represented by formula (4).

[0234] [Formula 4]

[023...

manufacture example

[0289] Methyl ethyl ketone (200.0 parts) was put into a reaction vessel equipped with a stirrer, a condenser, a thermometer and a nitrogen introduction tube, and resin A-1 (100.0 parts) was added and dissolved. A 1.0 mol / L potassium hydroxide aqueous solution was slowly added, and stirred for 10 minutes. Ion-exchanged water (500.0 parts) was slowly added dropwise to emulsify the solution. The emulsified product was distilled under reduced pressure to remove the solvent, and ion-exchanged water was added to adjust the concentration of the resin to 20%. An aqueous dispersion of resin particles E-1 was prepared. The physical property values ​​of the aqueous dispersion of resin particles A are shown in Table 3.

[0290]

[0291] Resin pellets were prepared in the same manner as in the production example of resin pellets E-1, except that resin A-1 was changed to other polymers and the amount of 1.0 mol / L potassium hydroxide aqueous solution was changed as shown in Table 3...

Embodiment 1

[0301] (Preparation of Toner Base Particles)

[0302] 0.1mol / L of Na 3 PO 4 The aqueous solution (850.0 parts) was put into a container equipped with a high-speed stirrer Clearmix (manufactured by MTechnique Co., Ltd.). The number of revolutions was adjusted to 15000 rpm, and the vessel was heated to 60°C. Add 1.0mol / L of CaCl to it 2 Aqueous solution (68.0 parts), thus prepares the dispersant Ca 3 (PO 4 ) 2 aqueous medium. After stirring for 30 minutes, the pH was adjusted to 6.0.

[0303] The materials listed below were dissolved at 100 r / min using a propeller stirrer to prepare a solution.

[0304] Styrene (70.0 parts)

[0305] n-butyl acrylate (30.0 parts)

[0306] Saturated polyester resin (3.0 parts)

[0307] (Bisphenol A copolymer modified by terephthalic acid-propylene oxide, acid value: 13mgKOH / g, Mw: 14500)

[0308] Next, add the materials listed below to the solution:

[0309] C.I. Pigment Blue 15:3 (6.5 parts)

[0310] Ester ...

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Abstract

The invention provides a toner which does not change in charging performance with fluctuations of ambient conditions and which, when used in a high-speed one-component development system, gives highly stable images after a large number of copies are printed in a high-temperature high-humidity environment; and a process for producing the toner. The toner comprises toner particles obtained by adhering resin particles to the surface of toner base particles each comprising a binder resin, a colorant, and a release agent, and is characterized in that the resin particles comprise a resin A, the resin A having an ionic functional group and a pKa (acid dissociation constant) of 7.0-9.0. (In formula (1), R1 represents a hydroxy group, carboxy group, C1-18 alkyl group, or C1-18 alkoxy group; R2 represents a hydrogen atom, hydroxy group, C1-18 alkyl group, or C1-18 alkoxy group; g is an integer of 1-3; and h is an integer of 0-3. When h is 2 or 3, the h R1 groups may be the same or different.)

Description

technical field [0001] The present invention relates to a toner used for developing an electrostatic image in an image forming method such as electrophotography or electrostatic printing, and to a method for producing the toner. Background technique [0002] In recent years, copiers and printers have been used in new market areas, and have also been used in different environments. In such cases, high-speed printing and high image stability are required. For example, a printer traditionally used mainly in offices is used in a harsh environment with high temperature and high humidity. In order to satisfy demands for miniaturization, high speed, and high stability, printers using a high-speed one-component developing method have attracted attention. The toner used in the one-component developing system has less chance of contacting the charging member than the toner used in the two-component developing system using a carrier. Therefore, a relatively large stress should be ap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/08C08F12/08C08F12/24G03G9/087
CPCG03G9/0806G03G9/0825G03G9/08795G03G9/08797G03G9/09708G03G9/0975G03G9/09783G03G9/09733G03G9/081
Inventor 桝本茜中村邦彦富永英芳
Owner CANON KK
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