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Toner for developing electrostatic image, method for producing the same, developer, image forming apparatus, process cartridge, and image forming method

A technology for developing electrostatic images and toners, which is applied in the field of developers and toners for developing electrostatic latent images, and can solve problems such as film formation

Inactive Publication Date: 2006-04-05
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although there is no problem of film formation on the surface of the photoreceptor due to surface reduction as in the prior art, the problem of film formation occurs with increased hardness and longer life.

Method used

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  • Toner for developing electrostatic image, method for producing the same, developer, image forming apparatus, process cartridge, and image forming method
  • Toner for developing electrostatic image, method for producing the same, developer, image forming apparatus, process cartridge, and image forming method
  • Toner for developing electrostatic image, method for producing the same, developer, image forming apparatus, process cartridge, and image forming method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment A

[0410] Next, the present invention will be further described through Example A, however, the present invention is not limited to this example. Parts represent parts by weight.

[0411] (Two-component developer evaluation)

[0412] When image evaluation is performed using a two-component developer, as shown below, a ferrite carrier with an average particle size of 35 μm coated with a silicone resin with an average thickness of 0.5 μm is used, and the form of stirring by rotating the container is used. A twist mixer uniformly mixed 7 parts by weight of toners of each color with respect to 100 parts by weight and charged them to prepare a developer.

[0413] (manufacture of carrier)

[0414] ·Core

[0415] Mn ferrite fine particles (weight average particle diameter: 35 μm) 5000 parts by weight

[0416] ·Coating material

[0417] 450 parts by weight of toluene

[0418] Silicone resin SR2400 (manufactured by Toray Douko-ning Silicone Co., Ltd. (Silicon), 50% non-volatile cont...

Embodiment A-1

[0431] ~Synthesis of Organic Microparticle Emulsion~

manufacture example 1

[0433] In a reaction vessel equipped with a stirrer and a thermometer, add 683 parts of water, 11 parts of sodium salt of methacrylic acid ethylene oxide adduct sulfate (Elemino-lu RS-30, manufactured by Sanyo Chemical Industry Co., Ltd.), 166 parts Methacrylic acid, 110 parts of butyl acrylate, and 1 part of ammonium persulfate were stirred at 3800 rpm for 30 minutes to obtain a white emulsion. The internal temperature of the system was raised to 75° C. by heating and reacted for 3 hours. Furthermore, 30 parts of 1% ammonium persulfate aqueous solution was added and aged at 70°C for 5 hours to obtain vinyl resin (sodium salt of methacrylic acid-butyl acrylate-methacrylic acid oxirane adduct sulfuric acid ester) A water-soluble dispersion ("microparticle dispersion 1"). The volume average particle diameter of "fine particle dispersion 1" measured using LA-920 was 75 nm. Part of the "fine particle dispersion 1" was dried to separate the resin component. The Tg of this resin ...

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Abstract

In an image-forming device (20), the toner developing the electrostatic latent image consists of at least a binding resin and a colorant and the surface of the toner is arranged with an external additive. The invention is characterized in that when the toner is added to the electrolytic solution with a surface-active agent added in for dispersion, the amount of the free external additive dissociating from the surface of the toner is between 7 to 50 percent.

Description

technical field [0001] The present invention relates to a toner for developing an electrostatic latent image, a developer used in image formation by an electrostatic copying process of a copier, a facsimile machine, a printer, etc., and to a process cartridge using the toner and an image forming device. Background technique [0002] In an image forming method such as electrophotography, electrostatic recording, electrostatic printing, etc., in the developing step thereof, the toner contained in the developer is once attached to an image carrier such as a photoreceptor on which an electrostatic image is formed, Then, in the transfer step, the toner is transferred from the photoreceptor to a transfer medium such as transfer paper, and then fixed on the paper in the fixing step. As the developer, it can be divided into a one-component developer and a two-component developer, and known are a two-component developer consisting of a magnetic carrier and a toner, and a one-compone...

Claims

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Application Information

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IPC IPC(8): G03G9/08G03G9/083G03G15/01G03G21/00G03G15/20G03G9/097
CPCG03G9/0806G03G9/09708G03G9/09716G03G9/0815G03G9/09725G03G9/0804
Inventor 杉浦英树
Owner RICOH KK
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