Semiconductive roller

A semi-conductive, rubber-based technology, which is applied in the direction of electrography, electrical recording technology using charge patterns, and equipment using electric recording technology using charge patterns, etc. It can solve problems such as bad images, unrecoverable images, uneven images, etc. , to achieve the effect of excellent image durability, not easy to deteriorate the toner, and not easy to stain

Active Publication Date: 2016-10-26
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, if a softener or liquid rubber is added, the compression set of the developing roller tends to increase. A developing roller with a large compression set has the following problems: Even after the developing roller starts to rotate, the original state cannot be restored even after the pressure is released, that is, the so-called deformation occurs, and the formed image is prone to image defects such as image unevenness.
[0012] In addition, especially the softener also has the following problem: in the state where the developing roller is assembled in, for example, a developing unit of an image forming apparatus and is in contact with the surface of the photoreceptor, the softener tends to ooze out when it is left standing for a long time in a high-temperature and high-humidity environment. , the exuded softener pollutes the photoreceptor, and the formed image is prone to image defects such as polluted lines

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0173] (Preparation of rubber composition)

[0174] Each of the following rubber components was blended.

[0175] (1) GECO [EPION (registered trademark)-301 manufactured by DAISO Co., Ltd., EO / EP / AGE=73 / 23 / 4 (molar ratio)] 20 parts by mass

[0176] (2) BR [the aforementioned JSR BR01 manufactured by JSR Corporation, cis-1,4 bond content: 95%] 69 parts by mass

[0177] (3) Liquid BR [Kurapuren LBR-307 manufactured by KURARAY Co., Ltd. mentioned above, number average molecular weight Mn: 8000] 1 part by mass

[0178] (4) 10 parts by mass of CR [the above Showa Denko Co., Ltd. SHOWPRENEWRT]

[0179] While masticating 100 parts by mass of the rubber components (1) to (4) above using a Banbury mixer, conductive carbon black (granular product of DENKABLACK (registered trademark) manufactured by Denki Kagaku Kogyo Co., Ltd.) was blended. 20 parts by mass and 5 parts by mass of Znhua [Mitsui Metal Mining Co., Ltd., two types of zinc oxide] as a crosslinking auxiliary agent were kne...

Embodiment 1-2～1-8

[0194] The amount of the liquid BR of (3) is 3 mass parts (embodiment 1-2), 5 mass parts (embodiment 1-3), 10 mass parts (embodiment 1-4), 20 mass parts (embodiment 1 -5), 30 parts by mass (Example 1-6), 40 parts by mass (Example 1-7) and 50 parts by mass (Example 1-8), and the total amount of the rubber component becomes 100 parts by mass Except for adjusting the amount of BR in (2), a rubber composition was prepared in the same manner as in Example 1-1, and a semiconductive roller was produced.

Embodiment 1-9～1-15

[0196] As the liquid BR of (3), the above-mentioned Kurapuren LBR-305 [number average molecular weight Mn: 26000] manufactured by KURARAY Co., Ltd. was used, and the amount was 1 part by mass (Example 1-9), 5 parts by mass (Example 1-9) Example 1-10), 10 parts by mass (Example 1-11), 20 parts by mass (Example 1-12), 30 parts by mass (Example 1-13), 40 parts by mass (Example 1-14) and 50 parts by mass (Example 1-15), and the amount of BR in (2) was adjusted respectively so that the total amount of the rubber component became 100 parts by mass, and a rubber combination was prepared in the same manner as in Example 1-1. material to make semi-conductive rollers.

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PUM

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Abstract

The invention provides a semiconductive roller. The semiconductive roller is soft while serving as a developing roller, can avoid degradation of toner, is excellent in image durability, can avoid photoreceptor pollution, is less in compression permanent deformation, and can avoid deformation. A semiconductive roller (1) is provided, which is formed from a rubber composition containing a rubber component including: (1) an epichlorohydrin rubber; (2) at least one solid rubber selected from the group consisting of a solid BR and a solid SBR; and (3) at least one liquid rubber selected from the group consisting of a liquid BR and a liquid SBR.

Description

technical field [0001] The present invention relates to a semiconductive roller suitable for use particularly as a developing roller and the like in an image forming apparatus utilizing electrophotography. Background technique [0002] For example, in an image forming apparatus using electrophotography such as a laser printer, an electrostatic copier, a plain paper facsimile apparatus, or their multifunction machines, in order to expose the surface of a charged photoreceptor to develop an electrostatic latent image formed on the surface into a For toner images, a developing roller is used. [0003] That is, when the developing roller is rotated in contact with the quantity regulating blade (charging blade), the toner is charged, and the charged toner adheres to the outer peripheral surface of the developing roller, while the amount of adhesion is restricted by the quantity regulating blade. The outer peripheral surface of the developing roller forms a toner layer with an al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G15/08
CPCG03G15/0808G03G15/0818
Inventor 黑田贤一
Owner SUMITOMO RUBBER IND LTD
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