Toner for electrophotography and image forming apparatus

An electrophotography and toner technology, which is applied in the direction of electric recording process applying charge pattern, equipment and developer, etc., can solve the problem of printing plate contamination, toner fluidity or electrification. Deterioration of characteristics, failure to obtain image density, etc.

Inactive Publication Date: 2006-06-21
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these external additives are buried in the toner matrix or released from the surface of the toner due to repeated use of multiple sheets, mechanical stress inside the developing machine, etc., so that the fluidity or charging characteristics of the toner deteriorate.
As a result, an appropriate image density cannot be obtained, or it may cause staining on the printing plate

Method used

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  • Toner for electrophotography and image forming apparatus
  • Toner for electrophotography and image forming apparatus
  • Toner for electrophotography and image forming apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment A

[0442] (Two-component developer evaluation)

[0443] When image evaluation is performed using a two-component system developer, as shown below, a ferrite carrier with an average particle diameter of 35 μm coated with a silicone resin with an average thickness of 0.5 μm is used in a form that is stirred by rotating the container. A twirling mixer uniformly mixed 7 parts by weight of toners of each color with respect to 100 parts by weight of the carrier and charged them to prepare a developer.

[0444] (manufacture of carrier)

[0445] ·Core

[0446] Mn ferrite fine particles (weight average particle diameter: 35 μm) 5000 parts by weight

[0447] ·Coating material

[0448] 450 parts by weight of toluene

[0449] Silicone resin SR2400 (manufactured by Toray Dou Corning Silicone Co., Ltd. (Silicon), 50% non-volatile content) 450 parts by weight

[0450] Aminosilane SH6020 (manufactured by Toray Dou Corning Silicone Co., Ltd.)

[0451] ...

Embodiment A-1

[0479] Hereinafter, for the specific production of the present invention "a toner composition comprising a binder resin containing a modified polyester resin capable of reacting with at least a compound having an active hydrogen group, a colorant, and a release agent Dissolving or dispersing in an organic solvent, dispersing the toner composition solution or dispersion in an aqueous medium containing resin particles, performing chain extension and / or crosslinking reactions, and removing the organic solvent from the obtained dispersion, Washing, drying, and the toner containing at least one kind or more than one kind of inorganic fine particles inside, (1) to (12) will be described in order.

manufacture example

[0481] Liquid SiCl as raw material for the core 4 Use a liquid raw material supply device to blow in argon as a carrier gas with a flow rate of 300SCCM (standard volume flow rate (CC) per minute), and SiCl with a flow rate of 250SCCM 4 Steam, hydrogen 20SLM (standard volume flow per minute (L)) and oxygen 20SLM are sent to the core burner for flame hydrolysis to fuse them to form SiO 2 particle. The microparticles are grown to a predetermined primary particle diameter, and the obtained microparticles are treated with hexamethyldisilazane for hydrophobization. [Inorganic fine particles 1] having an average primary particle diameter of 5 nm was obtained.

[0482] (2) Synthesis of organic particle emulsion

[0483] In a reaction vessel equipped with a stirring bar and a thermometer, add 683 parts of water, 11 parts of sodium salt of methacrylic acid ethylene oxide adduct sulfate (Eleminol RS-30, manufactured by Sanyo Chemical Industry Co., Ltd.), 83 parts Parts of styrene, 83...

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PUM

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Abstract

An object of the present invention is to provide a charging device, a developing device, a photoreceptor, and an intermediate transfer body that can obtain high-quality images without being contaminated by a developer with a narrow charge distribution. An image forming apparatus for electrophotography that can obtain an appropriate image density even when the sheet is used repeatedly and has very little staining on the printing plate surface is also provided.

Description

technical field [0001] The present invention relates to a toner used in a developer for first applying an electrostatic image in electrophotography, electrostatic recording, electrostatic printing, etc., a process cartridge filled with a developer containing the toner, Electrophotographic developing device. In more detail, it relates to a toner for electrophotography, a developer for electrophotography, and a process cartridge filled with the developer for electrophotography, which are used in copiers, laser printers, and plain paper facsimile machines using direct or indirect electrophotographic development methods. , Electrophotographic developing device. It also relates to a toner for electrophotography, a developer for electrophotography, a toner for electrophotography, a toner for electrophotography, a toner for electrophotography, a toner for electrophotography, a toner for electrophotography, a toner for electrophotography, a full-color photocopier, a full-color laser ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/087G03G5/08G03G9/097G03G15/20
Inventor 中山慎也望月贤岩本康敬朝比奈安雄梅村和彦杉浦英树中岛久志市川智之内海知子坂田宏一小番昭宏内野仓理石井雅之
Owner RICOH KK
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