Semiconductive electric roller

By using a semiconductive rubber composition of epichlorohydrin rubber, diene rubber, titanium oxide and other materials, and forming an oxide film on the outer peripheral surface, the problem of adhesion and accumulation of external additives when the semiconductive roller is charged is solved, achieving Low roller resistance and high image quality.

Inactive Publication Date: 2016-10-05
SUMITOMO RUBBER INDUSTRIES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] However, the cross-linked rubber has high friction and strong adhesion, so when the coating film is omitted or replaced with a thin oxide film, the above-mentioned external additives, etc. tend to adhere or gradually accumulate on the outer periphery of the semiconductive roller. noodle
This problem is remarkable especially in the charging roller which is in contact with the surface of the photoreceptor for a long time.
[0014] Moreover, the accumulated external additives may affect the characteristics of the semiconductive roller, such as the charging characteristics of the photoreceptor in the charging roller, or may reattach to the paper to form an image and cause image defects.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0213] (Preparation of Semiconductive Rubber Composition)

[0214] Each of the following rubber components was compounded.

[0215] (A) GECO [Epion (registered trademark)-301L manufactured by Daiso (Co., Ltd.), EO / EP / AGE=73 / 23 / 4 (molar ratio)] 60 parts by mass

[0216] (B) CR [SHOWPRENE (registered trademark) WRT manufactured by Showa Denko (KK)] 20 parts by mass

[0217] (C) NBR [JSR (registered trademark) N250SL manufactured by JSR (Co., Ltd.), low-nitrile NBR, acrylonitrile content: 20%] 20 parts by mass

[0218] While masticating 100 parts by mass of the above-mentioned rubber components (A) to (C) using an internal mixer, first, potassium bis(trifluoromethanesulfonyl)imide (Mitsubishi Materials Electronic Chemicals Co., Ltd.) was mixed as a potassium salt. Co., Ltd.) EF-N112] 2 parts by mass, anatase-type titanium oxide [Titan Kogyo (Kogyo Co., Ltd.) KA-20] 20 parts by mass, hydrotalcite-type as an acid absorbing agent [Kyowa Chemical Industry ( Co., Ltd.) 5 parts by m...

Embodiment 2

[0233] A semiconductive rubber composition was prepared in the same manner as in Example 1 except that the same amount of rutile-type titanium oxide [KR-380 manufactured by Titan Kogyo Co., Ltd.] was blended as titanium oxide, and a semiconductive roller was produced.

Embodiment 3、4、 comparative example 2

[0237]The mixing ratio of anatase-type titanium oxide is 4 parts by mass (Comparative Example 2), 5 parts by mass (Example 3), 50 parts by mass (Example 4), and 60 parts by mass relative to 100 parts by mass of the total amount of the rubber component. Except the parts by mass (Comparative Example 3), a semiconductive rubber composition was prepared in the same manner as in Example 1, and a semiconductive roller was produced.

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PUM

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Abstract

A semiconductive electric roller is provided, which is capable of uniformly electrically charging a surface of a photoreceptor body particularly when being used as a charging roller, substantially free from defective image formation due to adhesion and accumulation of external additives even if repeatedly performing a charging operation, and less liable to contaminate the photoreceptor body, and has a lower roller resistance to make it possible to form higher-definition images at a higher process speed. The semiconductive roller (1) is formed from a semiconductive rubber composition which contains a rubber component including 15 to 80 mass % of an epichlorohydrin rubber, 5 to 50 parts by mass of titanium oxide based on 100 parts by mass of the rubber component, and a potassium salt as an electrically conductive agent. The semiconductive roller (1) has an oxide film (5) provided in an outer peripheral surface (4) thereof.

Description

technical field [0001] The present invention relates to a semiconductive roller that can be used, particularly as a charging roller, in an image forming apparatus utilizing electrophotography, such as a laser printer, an electrostatic copier, a plain paper facsimile apparatus, or a composite machine thereof. Background technique [0002] In the image forming apparatus described above, as a charging roller for uniformly charging the surface of the photoreceptor, and a developing roller for developing an electrostatic latent image formed by exposing the charged surface into a toner image, the formed toner image is transferred to A transfer roller for paper or the like, a cleaning roller for removing toner remaining on the surface of a photoreceptor after transferring a toner image to paper or the like, etc., are generally used, for example, by molding a semiconductive rubber composition into a cylindrical shape and A semi-conductive roller made by cross-linking the rubber comp...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): G03G15/02
CPCG03G15/0233
OwnerSUMITOMO RUBBER INDUSTRIES LTD