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Semiconductive roller

A semi-conductive and rubber-based technology, which is applied in the direction of electrography, electrical recording technology using charge patterns, and equipment for electric recording technology using charge patterns, etc., and can solve problems such as low image density

Inactive Publication Date: 2015-11-11
SUMITOMO RUBBER IND LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when an image is formed in a lower temperature and lower humidity environment (at a temperature of 10°C and a relative humidity of 30%), the image tends to have a lower image density

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0159] (Preparation of rubber composition)

[0160] By adding 50 parts by mass of GECO (purchased from DaisoCo., Ltd and EPION (registered trade name) 301 with a molar ratio of EO / EP / AGE=73 / 23 / 4), 20 parts by mass of CR (purchased from Showa Denko SHOPRENE (registered trade name) WRT) of Co., Ltd. and 30 parts by mass of NBR (low acrylonitrile content NBR JSRN250S purchased from JSR Co., Ltd. and having an acrylonitrile content of 20%) were blended to prepare a rubber component.

[0161] When 100 parts by mass of the rubber component were simply kneaded by a Banbury mixer, ingredients shown in Table 1 below except the crosslinking component were added to the rubber component and kneaded with the rubber component. Finally, a crosslinking component is added to the resulting mixture and further kneaded with the resulting mixture. Thus, a rubber composition was prepared.

[0162] Table 1

[0163]

[0164] The ingredients shown in Table 1 are as follows:

[0165] Sulfur cros...

Embodiment 2

[0182] A semiconductive roller having a fluorinated film formed on its outer peripheral surface was produced in substantially the same manner as in Example 1, except that the fluorine gas treatment was performed at a treatment temperature of 60° C. and a treatment time of 1 hour.

Embodiment 3

[0184] A semiconductive roller having a fluorinated film formed on its outer peripheral surface was produced in substantially the same manner as in Example 1 except that the fluorine gas treatment was performed at a treatment temperature of 90° C. and a treatment time of 1 hour.

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Abstract

To provide a semiconductive roller which, when being used as a developing roller in combination with a positively chargeable toner, is capable of suppressing adhesion of the toner thereto to suppress reduction of image density, charging the toner to a higher toner charging level to ensure formation of higher-quality images, and suppressing reduction of toner charging level even after continuous repeated image formation to thereby suppress fogging of formed images for a longer period of time. The semiconductive roller (1) is made of a crosslinking product of a rubber composition containing at least an epichlorohydrin rubber and a chloroprene rubber, and has a fluorinated film (5) formed in an outer peripheral surface (4) thereof by treatment with fluorine gas.

Description

technical field [0001] The present invention relates to a semiconductive roller which is advantageously used as a developing roller and the like in an electrophotographic image forming apparatus. Background technique [0002] In an electrophotographic image forming apparatus such as a laser printer, an electrostatic copier, a plain paper facsimile machine, or a print-copy-fax multifunctional machine, the photoreceptor surface is charged and exposed to light on the surface of the photoreceptor. An electrostatic latent image is formed, developed with a charged toner into a toner image, and developed using a developing roller. [0003] It has been proposed to form an outermost layer of a fluorine atom-containing organic polymer on the peripheral surface of the developing roller to reduce friction of the peripheral surface of the developing roller to suppress adhesion of toner to the peripheral surface, thereby suppressing reduction in image density. [0004] The organic polyme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G15/08
CPCG03G15/0808C08L11/00C08L71/03C08L9/02C08L9/06
Inventor 黑田贤一森一高江口敦
Owner SUMITOMO RUBBER IND LTD
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