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Toner and production method thereof, image forming apparatus and image forming method, and process cartridge

A toner and image technology, applied in the field of toner, can solve the problems of delay in initial charge accumulation, unstable charge of toner particles, and difficulty in cleaning

Active Publication Date: 2007-07-04
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the recording medium is detached from the photoconductor, a high electric field is induced between the photoconductor and the recording medium, which is called a burst phenomenon, and a problem arises in this process: transfer between the recording medium and the recording medium The toner on the photoconductor is dispersed, and toner dust appears on the recording medium
This causes serious problems, especially in full-color image forming apparatuses requiring high-quality images
[0006] Further, a toner whose shape is close to a perfect sphere has a problem that it is difficult to clean by conventionally using a blade cleaning method
[0010] However, when the toner of the concave-convex shape is formed like the toner described above, there may arise a problem that since the frequency of contact between the concave portion of the toner and the carrier decreases, the initial charge accumulation time may be delayed or the charge amount of a single toner particle may be delayed. May reduce
However, although the initial charge accumulation time is improved to be accelerated, the toner disclosed in Patent Document 8 has problems in that the charge amount of individual toner particles is unstable over time, and due to stress (especially image developing device The stress in the middle) makes the charged amount significantly reduce
[0020] However, the present invention disclosed in Patent Document 10 cannot maintain the transfer performance of the toner because the invention does not use a deformation method to maintain the spherical shape of the toner

Method used

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  • Toner and production method thereof, image forming apparatus and image forming method, and process cartridge
  • Toner and production method thereof, image forming apparatus and image forming method, and process cartridge
  • Toner and production method thereof, image forming apparatus and image forming method, and process cartridge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment A-1

[0271] -Preparation of Spherical and Hydrophobic Silica-

[0272] According to the sol-gel method, tetramethoxysilane and ammonia water react with each other at 50°C to produce spherical silica. After washing the silica with water, the silica was rinsed with methanol, then dispersed in toluene without a drying operation, and then treated with hexamethyldisilazane (HMDS) to obtain inorganic oxide particles 1 . The inorganic oxide particles were stirred in methanol using an ultrasonic dispersing device, and the number average diameter thereof was measured by a laser-diffraction-scattering-particle size-distribution sieve. The number average diameter of the generated primary particles was 120 nm.

[0273] -Synthesis of Organic Microparticle Emulsion-

[0274] In the reaction vessel that stirrer and thermometer are equipped with, pour the sodium salt of the sulfuric acid ester (ELEMINOL RS-30 of the water of 683 mass parts, 11 mass parts of ethylene oxide adducts of methacrylic ...

Embodiment A-2

[0303] A toner was obtained in the same manner as in Example A-1, except that the method of rinsing to mixing of the external additive was changed to the method of the following conditions.

[0304] -rinsing-

[0305] After filtering 100 parts by mass of dispersion slurry 1 under reduced pressure,

[0306] (1): 100 parts by mass of ion-exchanged water was added to the filter cake, mixed in a TK homomixer for 10 minutes at a rotation speed of 12,000 rpm, and filtered.

[0307] (2): To the filter cake of (1), 100 parts by mass of a 10 mass % sodium hydroxide solution was added, mixed in a TK homomixer at 12,000 rpm for 30 minutes and filtered under reduced pressure.

[0308] (3): 100 parts by mass of 10% by mass hydrochloric acid was added to the filter cake of (2), mixed in a TK homomixer for 10 minutes at a rotation speed of 12,000 rpm, and filtered.

[0309] (4): 300 parts by mass of ion-exchanged water was added to the filter cake of (3), mixed in a TK homomixer at a rotat...

Embodiment A-3

[0317] Toner 3 was obtained in the same manner as in Example A-1 except that the conditions were changed to the following. The thickness of the filler layer in the toner is 0.01 μm to 0.2 μm.

[0318] -Emulsification, solvent removal-

[0319] Put 749 mass parts of pigment wax dispersion liquid 1, 115 mass parts of prepolymer 1, 2.9 mass parts of ketimine compound 1 and 100 mass parts (10 mass %) filler (Organo Silicasol MEK-ST- UP, the number-average particle diameter of the primary particles=12nm), was mixed at 5,000 rpm for 2 minutes by a TK homomixer (manufactured by TOKUSHU KIKA KOGYO CO., LTD.), and then 1,200 parts by mass of Water phase 1 and mixed in a TK homomixer at 13,000 rpm for 10 minutes to obtain emulsion slurry 2.

[0320] The emulsion slurry 2 was put into a container equipped with a stirrer and a thermometer, then the solvent was removed at 30° C. for 6 hours, and the product was aged at 45° C. for 5 hours to obtain a dispersion slurry 2 .

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Abstract

The object of the invention is to provide a toner enabling excellent transferring properties, cleanability, and fixability, and forming a high-precision image without substantially degraded image quality even after printed on a number of sheets of paper. The invention also provides the toner-production method, an image forming apparatus, an image forming method, and a process cartridge. To this end, the present invention provides a toner which comprises toner-base particles containing a binder resin and a filler, and inorganic fine particles, in which the filler is included in a filler-layer in the vicinity of surfaces of the toner-base particles, the number average particle diameter of the primary particles of the inorganic fine particles is 90nm to 300nm, and the average circularity of the toner is 0.95.

Description

technical field [0001] The present invention relates to a toner for image formation according to an electrophotographic method such as a copier, a facsimile machine, a printer, a production method thereof, an image forming apparatus using the toner, an image forming method thereof, and a process cartridge. Background technique [0002] An image forming method based on an electrophotographic method, comprising charging the surface of a photoconductor as a latent image carrier by discharging; exposing the charged surface of the photoconductor to form an electrostatic latent image; by supplying toner to the electrostatic latent image, making developing the electrostatic latent image formed on the surface of the latent image carrier to form a visible image; transferring the toner image on the surface of the photoconductor to the surface of the recording medium; fixing the toner image on the surface of the recording medium; The residual toner remaining on the surface of the image...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/08G03G9/087
CPCG03G9/0872G03G9/08764G03G9/08755G03G9/08722G03G9/08704G03G9/0819G03G9/0825G03G9/0806G03G9/0821G03G9/08751G03G9/0827G03G9/08753G03G9/0804G03G9/09708G03G9/09733G03G9/09725G03G9/08782G03G9/09716
Inventor 内海知子望月贤杉浦英树市川智之增田稔中山慎也
Owner RICOH KK
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