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Semi-conductive rubber part

A rubber part and semi-conductive technology, which is applied in the field of semi-conductive rubber parts, can solve the problems of easy condensation of toner, difficulty in electrification, and spheroidization of toner, so as to maintain the uniformity of electrical characteristics, suppress cracking, and prevent cracking Effect

Inactive Publication Date: 2005-08-17
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] When the above-mentioned toner with a particle size of 10 μm or less is used, there is a problem that has never existed in the past: that is, the toner is easy to coagulate during storage, and the toner shape becomes spherical due to polymerization, the surface area of ​​the toner becomes small, and it is difficult to charged etc.
Therefore, when continuously used as a developing roller, the surface of the roller is different from the initial state, that is, there is a problem that the surface layer is completely covered with the toner external additives.
[0023] In addition, the toner external additives also have the following problems: with use, the toner is transported between the photoreceptor and the transfer roller through the paper, the paper is in contact with the photoreceptor, and the silicon dioxide, calcium carbonate, etc. in the paper Components adhere to the photoreceptor and penetrate into the developing roller (including the toner cartridge as the case may be) as the photoreceptor rotates. The infiltrated paper component is the same as the external additive, which will adversely affect the developing roller
However, it is difficult to uniformly blend low specific gravity resin into high viscosity rubber

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0178] The rollers of Examples 1-6 and the rollers of Comparative Examples 1-3 composed of the semiconductive rubber member of the present invention were produced, and their characteristics were measured.

[0179] After kneading the additives listed in Tables 1 and 2 below with a Banbury mixer, they were extruded with an extruder and processed into a tubular shape with an outer diameter of φ18 mm and an inner diameter of φ9.5 mm. This tube was mounted on a shaft for vulcanization, vulcanized in a vulcanization tank at 160°C for 1 hour, then mounted on a shaft of φ10 mm coated with a conductive adhesive, and bonded in a furnace at 160°C. Then, the end was shaped, laterally ground with a cylinder grinder, and mirror-polished as finish grinding, and ground to a predetermined surface roughness at φ16 mm (tolerance 0.05).

[0180] After washing the surface of the roller with water, except for Comparative Example 2, it was irradiated with ultraviolet rays to form an oxide layer on t...

Embodiment 7 and comparative example 4

[0231] Use the added materials shown in Table 3 to make a rubber sheet with a thickness of 3mm from an unvulcanized rubber roller, wind it on the vulcanization shaft in the die, pressurize and vulcanize it into a tubular shape with an outer diameter of φ18mm and an inner diameter of φ12.5mm, and then install it on the The φ14mm shaft coated with the conductive adhesive was bonded in a furnace at 160°C. Then, shape the end, use a cylindrical grinder for transverse grinding, and use mirror grinding as fine grinding, and grind to a specified surface roughness with φ16mm (tolerance 0.05).

[0232] In Example 7 and Comparative Example 4, the same materials as in Examples 1-6 and Comparative Examples 1-3 were used. However, "シススト3" produced by Tokai Carbon Co., Ltd. was used as the conductive carbon black.

[0233] With respect to the thus-produced semiconductive rubber rollers of Example 7 and Comparative Example 4, the roller resistance when 500 V was applied was measured, and th...

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Abstract

To provide a semiconductive rubber member causing no substantial sticking of foreign matter represented by a toner outer additive for a long period through reducing the surface free energy of the rubber member while maintaining its electrical properties' uniformity and design values' repeated reproducibility, excellent in processability and substantially exhibiting no surface defects including molding unevenness and cracks. This semiconductive rubber member is obtained by compounding 100 pts. mass of an ionically conductive rubber including a rubber having polyether linkages with 0.1-5 pt(s). mass of a wax. In this rubber member, it is preferable that the rubber having the polyether linkages to be used consists of a polymer made from a halogen-containing ether-based monomer and, when desired, a halogen-free ether-based monomer and / or a copolymerizable unsaturated epoxide-based monomer.

Description

technical field [0001] The present invention relates to a semiconductive rubber member, and more particularly, to a member used as a developing roller or the like in contact with toner in an image forming apparatus, in which external additives such as toner are less likely to adhere and have excellent Semi-conductive rubber parts with excellent processability. Background technique [0002] In recent years, image forming apparatuses such as laser printers have rapidly increased in speed and improved in image quality. Therefore, in the initial stage of image formation, the photoreceptor and its adjacent parts, which are directly related to image quality, are required to have high precision, high durability, high speed (fast response), and uniform characteristics within the parts. In particular, for parts that require electrical conductivity, it is required to adjust the resistance value to a predetermined value and at the same time to have very...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G15/08B32B7/02B32B25/04C08J7/00C08L71/02C08L71/03F16C13/00G03G15/02G03G15/16G03G21/10H01B5/00H01B13/00
Inventor 水本善久
Owner SUMITOMO RUBBER IND LTD
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