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Non-magnetic single-component toner, method of prepairing the same, and image forming apparatus using the same

A toner, negatively charged technology, applied in the field of single-component non-magnetic toner, can solve the problems of reduced transfer efficiency, reduced toner charge, and increased removal of toner

Inactive Publication Date: 2008-05-07
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, in the image forming apparatus using the negative charge reversal phenomenon, due to the toner attached to the non-image portion of the latent image carrier (photoreceptor), the amount of removed toner is increased.
Also, as the number of printed sheets increases, because the additives on the surface of the toner are buried, the amount of effective additives actually decreases, and the amount of toner fogging increases. At the same time, the charge amount of the toner decreases, resulting in toning agent scattering
[0010] ②In order to prevent the deterioration of the toner, if a large amount of silica is added to maintain the fluidity of the toner, although the fluidity is improved, the fixability is reduced
[0011] ③If silicon dioxide is added, the negative charging capacity of the toner is too high and the density of the printed image is reduced, so titanium dioxide and aluminum oxide with relatively low resistance are added, but generally the primary particle size of titanium oxide and aluminum oxide is small, so the printed sheet When the number increases, it is buried in the toner masterbatch, and its effect cannot be exerted
However, when the alumina-silica composite oxide particles are used as additive particles to form a negatively charged dry toner, since the alumina component has a positive charge function, reverse writing of the toner occurs and fogging increases. Furthermore, the problem that the transfer efficiency is also reduced

Method used

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  • Non-magnetic single-component toner, method of prepairing the same, and image forming apparatus using the same
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  • Non-magnetic single-component toner, method of prepairing the same, and image forming apparatus using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0190] Examples and comparative examples of the present invention, in which one-component non-magnetic toners were produced, were subjected to image forming tests. These examples and each comparative example and the imaging test used in the following description Figure 5 An example of the manufacture of an organic photoreceptor for an image forming apparatus performed by a non-contact one-component development process, and a transfer medium is shown.

[0191] Manufacture of one-component non-magnetic toner 8

[0192] In Examples and Comparative Examples of One-Component Non-magnetic Toner 8, two types of toners, the above-mentioned polymerization method toner and pulverization method toner, were produced. At this time, the flow improver (additive) used in the production of the toner of each example is hydrophobic rutile anatase-type titanium oxide (20 nm) with a major axis length of 20 nm, and a small particle size with an average primary particle size of 12 nm. Hydrophobic...

manufacture example 2

[0343] In the production of the organic multilayer photoreceptor 1 of Production Example 2, a seamless nickel electroforming tube with a thickness of 40 μm and a diameter of 85.5 mm was used on the conductive support frame 1 a, and the following structural formula ( 2) except for the distyryl compound, Organic Photoreceptor 1 (OPC2) was produced in the same manner as Production Example 1. The work function of this organic multilayer photoreceptor was similarly measured and found to be 5.50 eV.

[0344]

[0345] Structural formula (2)

[0346] Fabrication example of developing roller 11

[0347] The developing roller 11 is a surface having a surface roughness (Ra) of 4 μm by performing nickel plating (23 μm in thickness) on the surface of an aluminum tube with a diameter of 18 mm. A part of the surface of the developing roller 11 was cut off, and the work function was similarly measured, and found to be 4.58 eV.

[0348] Making of Toner Regulating Knife

[0349] The toner ...

Embodiment 6

[0375] Using the toner of Example 8 and Comparative Examples 7 to 9, after image formation in the contact development mode of image formation test 5, a fixability comparison was performed using a fixing device 60 described below.

[0376] The fuser 60 uses a φ40 heating roller (with a built-in 600W halogen lamp, forming a 50 μm thick PFA film on a silicone rubber 2.5mm (60°JISA)) and a φ40 pressure roller (with a built-in 300W halogen lamp, on a silicone rubber 2.5mm ( 60°JISA) was fixed with two pressure rollers (load of about 38kgf) with PFA formed into a film of 50μm thick) at a set temperature of 190°, and the fixability of each toner was compared. A weight of 200 g is placed on the cotton cloth, rubbed 50 times on the entire image, and the density of the entire image before and after rubbing is measured, and the fixability of the toner is converted into a retention rate (fixation rate) (%), which is used as an index of the fixability evaluation index. The results are sho...

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Abstract

The invention provides a negative charge toner, method of manufacturing the same and image forming device using the same. The said toner comprises: toner agglomerate, hydrophobic additive with negative charge and with less work function than the toner agglomerate; hydrophobic additive with positive charge and with less work function than the toner agglomerate and for treating the surface of the toner agglomerate using material with positive charge. Therefore, the amount of fog toner on non-image portions is reduced, the transfer efficiency is further improved, the charging property is further stabilized, and the production of reverse transfer toner is further inhibited.

Description

[0001] This application is a Chinese application with the application number CN02148220.9 (application date is July 11, 2002) and the title of the invention is "Single-component non-magnetic toner, its manufacturing method and image forming apparatus using the toner" divisional application. technical field [0002] The present invention relates to a one-component non-magnetic toner used in an image forming apparatus for image formation by electrophotography or the like to develop an electrostatic latent image on a latent image carrier of the image forming apparatus, a manufacturing method thereof, and a toner using the same In particular, it relates to a one-component non-magnetic toner composed of a plurality of master particles and a plurality of particles of an additive consisting of at least silicon dioxide and titanium oxide, a method for producing the same, and image formation using the toner device. Background technique [0003] Conventionally, as an image forming ap...

Claims

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Application Information

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IPC IPC(8): G03G9/08G03G9/087
Inventor 宫川修宏门田拓也高野秀裕安川信二功刀正尚
Owner SEIKO EPSON CORP
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