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Developing roller

A developing roller and rubber technology, which is applied in the field of developing rollers, can solve problems such as uneven thickness of toner layer, deviation in conveyance, blurring, etc., and achieve the effect of reducing frictional electrification and excellent uniformity

Active Publication Date: 2014-02-12
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 butyl-based rubber and diene-based rubber, that is, NBR, SBR, and CR, have insufficient compatibility, it is difficult to prepare a uniform rubber composition even if these rubbers are melt-kneaded as in the past. The rubber composition of is preferably prepared by the following method.

[0132] That is, first, the previously described four to five types of base rubbers serving as the basis of the rubber composition are added in a predetermined ratio to a solvent that is good for all the base rubbers, and heated as necessary to completely Dissolved to obtain a solution. Next, the above solution is cooled, filtered to remove insoluble components, and then a poor solvent for the above-mentioned base rubber is added to precipitate, filtered, and then dried to obtain a mixture of the above-mentioned 4 to 5 base rubbers.

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

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 above, manufactured by JSR Co., Ltd.] were used as butyl-based rubber. JSR BUTYL268] 2.5 parts by mass, CR [Shoprene (registered trademark) WRT manufactured by Showa Denko Co., Ltd.] 25 parts by mass, ECO [Daiso Co., Ltd. Epichlormer (registered trademark) D, ethylene oxide content: 61 mol%] 50 parts by mass.

[0163] The ratio of the IIR described above to 100 parts by mass of the total base rubber is 2.5 parts by mass.

[0164] Each of the above-mentioned base rubbers was added to 6 liters of toluene, which is a good solvent for each of the above-mentioned base rubbers, per 100 g of the total amount, and heated to 60° C. with stirring to completely dissolve them to obtain a solution.

[0165] Next, the above solution was cooled to room temperature, filtered through a 250-m...

Embodiment 2

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

[0186] The ratio of the IIR described above to 100 parts by mass of the total 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 mounted and used in a developing section of an image forming apparatus using electrophotography, such as a laser printer. Background technique [0002] An image forming apparatus utilizing electrophotography, such as the above-mentioned laser printer, electrostatic copier, plain paper facsimile apparatus, or their composite machines, for developing an electrostatic latent image formed by exposing the surface of a charged photosensitive drum into a toner image , a developing roller and an amount regulating blade (charging blade) pressed against the outer peripheral surface of the roller main body of the developing roller may be used. [0003] That is, when the developing roller is rotated in the state where the above-mentioned amount limiting blade is pressed against, the toner is charged, and the charged toner adheres to the outer peripheral surface of the developing roller, and the adhesion...

Claims

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Application Information

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IPC IPC(8): G03G15/08
CPCG03G15/0818
Inventor 川谷昭彦黑田贤一
Owner SUMITOMO RUBBER IND LTD