Electronic photographic developer and method for forming image

A technology for electrophotography and developer, applied in the direction of developer, electrography, optics, etc., can solve the problems of toner transfer charge, difficult charge of crystalline resin, etc., to achieve improved charging performance, good charging performance, image Excellent storage stability

Inactive Publication Date: 2002-07-17
FUJIFILM BUSINESS INNOVATION CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, compared with conventional amorphous resins, it is difficult for crystalline resins to hold charges, and thus, in the case where crystalline resins are used as toner binder resins, it is difficult to transfer sufficient charges to toner

Method used

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  • Electronic photographic developer and method for forming image
  • Electronic photographic developer and method for forming image

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0172] Synthesis of Crystalline Polyester Resin (1)

[0173] 17.4 parts by weight of 1,10-decanediol, 2.2 parts by weight of sodium dimethyl sulfophthalate, 10 parts by weight of dimethyl sulfite and 0.03 parts by weight of dibutyltin oxide as a catalyst were placed In the heated three-necked flask, the air in the flask was replaced with nitrogen by a decompression operation to form an inert atmosphere, followed by mechanical stirring at 180° C. for 3 hours. Dimethyl sulfoxide was distilled off under reduced pressure, and 26.5 parts by weight of dimethyl dodecanedioate was added thereto, followed by stirring at 180° C. for 1 hour.

[0174] Thereafter, the temperature was gradually increased to 220°C under reduced pressure, followed by stirring for 30 minutes. When the contents of the flask were in a viscous state, they were then cooled with air to terminate the reaction to synthesize 36 parts by weight of crystalline polyester resin (1).

[0175] The resulting crystalline po...

Embodiment 2

[0240] Synthesis of Crystalline Polyester Resin (2)

[0241] 124 parts by weight of ethylene glycol, 22.2 parts by weight of 5-sulfodimethylsodium phthalate, 213 parts by weight of dimethyl sebacate and 0.3 parts by weight of dibutyltin oxide as a catalyst were placed in the In the heated three-necked flask, the air in the flask was replaced with nitrogen by a decompression operation to form an inert atmosphere, followed by stirring at 180° C. for 5 hours with mechanical stirring.

[0242] Thereafter, the temperature was gradually increased to 220°C under reduced pressure, followed by stirring for 2 hours. When the contents of the flask were viscous, they were then cooled with air to terminate the reaction to synthesize 220 parts by weight of crystalline polyester resin (2).

[0243] The obtained crystalline polyester resin (2) was measured for molecular weight by gel permeation chromatography (GPC) (polystyrene standard), and it had a weight average molecular weight (Mw) of ...

Embodiment 3

[0263] Preparation of carrier (2)

[0264]A film-forming solution obtained by mixing a carbon dispersion liquid and 0.63 parts by weight of an 80% by weight trifunctional isocyanate (Takenate D110N, produced by Takeda Chemical Co., Ltd.) in ethyl acetate, and 100 parts by weight of Mn-Mg-Sr iron oxide Bulk particles (average particle diameter: 35 µm) were placed in a kneader / coater and stirred at normal temperature for 5 minutes, and the solvent was distilled off by raising the temperature to 150°C under normal pressure, and the carbon dispersed The solution is by adding 0.12 parts by weight of carbon black (VXC-72, trade name, produced by Cabot Corporation) to 75% by weight of toluene / butyl acetate solution of 0.66 parts by weight of acrylic polyol and toluene of 1.25 parts by weight, It was then dispersed in a sand mill for 20 minutes. After a further 30 minutes of agitation, the heater was turned off and cooled to 50°C. The resulting coated support was sieved with a 75 mi...

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Abstract

An electrophotographic developer and a process for forming an image are provided in that the fixing can be conducted at a lower temperature than the conventional technique, and that are excellent in the powder storage stability, the anti-blocking property and the image storage stability after fixing without impairing the density, the coloring property and the transparency of the image after fixing, and further have appropriate electric charging property without any problem of fogging or cloud with excellent maintenance property of electric charge. The electrophotographic developer contains a toner for developing an electrostatic image containing a coloring agent and a binder resin containing, as a main component, a crystalline resin having a melting point of about from 60 to 120 DEG C., and a carrier having a resin film containing a nitrogen-containing resin on a surface thereof. The process for forming an image is carried out by using the electrophotographic developer.

Description

technical field [0001] The present invention relates to an electrophotographic developer which can be used in electrophotographic apparatus such as copiers, printers and facsimiles which employ an electrophotographic method, and a method of forming an image using the electrophotographic developer. Background technique [0002] Conventional examples of the toner fixing process for developing an electrostatic image include a pressure fixing process at normal temperature by using only a pressure roller, a contact thermal fixing process using a heating roller, and also fixing by heating a heating chamber. process, a flash fixing process using a xenon lamp, an electromagnetic wave fixing process using a microwave, and from the standpoint of reliability and safety, non-contact fixing processes such as a solvent fixing process using solvent vapor, and heating chamber fixing processes such as And the contact heat fixing process is a process that utilizes heat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/08G03G9/087G03G9/10G03G9/113
CPCG03G9/1135G03G9/10G03G9/08797G03G9/08755G03G9/08
Inventor 滨野弘一大门克已芹泽学福岛纪人今井孝史市村正则
Owner FUJIFILM BUSINESS INNOVATION CORP
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