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Developing roller

A developing roller and rubber technology, which is applied in the direction of instruments, electrical recording process equipment using charge patterns, optics, etc., can solve the problems of conveyance deviation, uneven thickness of toner layer, uneven concentration, etc., and achieve excellent uniformity , Reduce the effect of triboelectricity

Active Publication Date: 2020-03-31
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above-mentioned developing roller is required to prevent the following problems as much as possible: due to poor charging of the toner, that is, deviation of the triboelectric chargeability of the toner on substantially the entire surface of the outer peripheral surface of the roller main body; or poor conveyance of the toner, that is, , the deviation of the conveyability of the toner on the substantially entire surface of the outer peripheral surface of the roller main body, etc., the thickness of the above-mentioned toner layer becomes uneven, and the so-called blurring occurs in which the toner adheres to other parts where the image is formed. , or image defect such as image density unevenness (density unevenness) of the formed image

Method used

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preparation example Construction

[0130]

[0131] Since the compatibility of butyl rubber and diene rubber, that is, with NBR, SBR, and CR, is insufficient, it is difficult to prepare a uniform rubber composition containing the above components even if these rubbers are melt-kneaded as in the past. The rubber composition is preferably prepared by the following method.

[0132] That is, first, the four to five types of base rubbers described above, which are the basis of the rubber composition, are added in a predetermined ratio to a solvent suitable for all base rubbers, and if necessary, heating or the like is performed to complete them. Dissolve to obtain a solution. Next, the solution is cooled, filtered to remove insoluble components, a poor solvent for the base rubber is added to precipitate, filtered, and dried to obtain a mixture of the above-mentioned four to five types of base rubbers.

[0133] Next, the above-mentioned mixture is masticated, and additives other than the crosslinking component are ...

Embodiment 1

[0161] (Preparation of rubber composition)

[0162] As the base rubber, 22.5 parts by mass of NBR [JSR N250SL manufactured by JSR Co., Ltd., low nitrile NBR, acrylonitrile content: 20%], and IIR [same as the above, manufactured by JSR Co., Ltd.] as the butyl rubber were used. JSR BUTYL268] 2.5 parts by mass, CR [Shoprene (registered trademark) WRT, manufactured by Showa Denko Co., Ltd.] 25 mass parts, and ECO [Epichlomer (registered trademark) D, manufactured by Daisho Co., Ltd., ethylene oxide content: 61 mol%] 50 parts by mass.

[0163] The ratio of the above-mentioned IIR to 100 parts by mass of the total amount of the base rubber was 2.5 parts by mass.

[0164] A solution was obtained by adding each of the above-mentioned base rubbers to 6 liters of toluene, which is a good solvent for each of the above-mentioned base rubbers, based on 100 g of the total amount thereof, and heating to 60° C. with stirring to completely dissolve them.

[0165] Next, the solution was coole...

Embodiment 2

[0185] In the base rubber, except that the mixing ratio of NBR was 20 parts by mass and the mixing ratio of IIR was 5 parts by mass, a rubber composition was prepared in the same manner as in Example 1, and a developing roller was produced.

[0186] The ratio of the above-mentioned IIR to 100 parts by mass of the total amount of the base rubber is 5 parts by mass.

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Abstract

A developing roller is provided which is capable of forming a toner layer having the most uniform possible thickness on an outer peripheral surface of a roller body thereof. The roller body (2) of the developing roller (1) is formed from a rubber composition containing a base rubber which is a mixture of NBR and / or SBR, CR, an epichlorohydrin rubber and IIR, wherein the IIR is present in a proportion of not less than 2.5 parts by mass and not greater than 20 parts by mass in 100 parts by mass of the base rubber.

Description

technical field [0001] The present invention relates to a developing roller which is used by being attached to a developing section of an image forming apparatus using an electrophotographic method, such as a laser printer. Background technique [0002] Image forming apparatuses using electrophotography, such as the above-mentioned laser printers, electrostatic copiers, plain paper facsimile apparatuses, or their multi-functional peripherals, develop a toner image from an electrostatic latent image formed by exposing the surface of a charged photoreceptor drum. , a developing roller and a quantity limiting blade (charging blade) that is pressed against the outer peripheral surface of the roller main body of the developing roller can be used. [0003] That is, when the developing roller is rotated in the state of the above-mentioned contact amount limiting blade, the toner is charged, and the charged toner adheres to the outer peripheral surface of the developing roller. As ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G15/08
CPCG03G15/0818
Inventor 川谷昭彦黑田贤一
Owner SUMITOMO RUBBER IND LTD