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Developing roller and imaging apparatus comprising the same

A developing roller and surface coating technology, which is applied in the field of developing rollers and imaging devices, can solve problems such as increased compression set, large compression set, and toner melting, achieving low compression set, stable and excellent images, The effect of excellent resistance to toner melting

Inactive Publication Date: 2012-05-23
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] On the other hand, when a low-hardness developing roller is used in an image forming device, there is a problem that marks are easily formed on the surface of the developing roller due to the pressing of the photosensitive drum, scraper, feed roller, etc.
However, materials with low hardness tend to increase compression set, so that it is very difficult to balance hardness and compression set at sufficiently low levels (see JP-A-H08-190263, JP-A-2001-75354 and JP -A-2004-67726)
Also, when using a coating film mixed with an adipate compound as a plasticizer, the coating film becomes soft, but there is a problem that compression is caused during long-term use in a high-temperature, high-humidity environment The permanent set becomes larger and causes the toner to melt, producing vertical streaks in the image

Method used

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  • Developing roller and imaging apparatus comprising the same
  • Developing roller and imaging apparatus comprising the same

Examples

Experimental program
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preparation example Construction

[0073] (Preparation of roll body)

[0074] A urethane prepolymer having acetylene black dispersed therein was prepared as a component by mixing 100 parts by mass of a urethane prepolymer synthesized from toluene diisocyanate (TDI) and polyether polyol with 2 parts by mass of acetylene black Point A. On the other hand, 30 parts by mass of polyether polyol and 0.1 part by mass of sodium perchlorate (NaClO 4 ) was mixed while heating at 70°C, and it was further mixed with 4.5 parts by mass of polyether-modified silicone oil (foam stabilizer) and 0.2 parts by mass of dibutyltin dilaurate (catalyst) to form a mixture as component B. Subsequently, Component A and Component B were foamed by a mechanical foaming method and poured into a cylindrical mold in which a core was placed, followed by RIM molding to produce a roller comprising an elastic layer made of polyurethane foam body.

Embodiment 1

[0076] By adding 100 parts by mass of caprolactone-modified polyol (PCL205, produced by Daicel Chemical Industries, Ltd., molecular weight: 500), 35 parts by mass of carbon black and 50 parts by mass of cyanurate-modified HDI (Coronate HX, Produced by Nippon Polyurethane Industry Co., Ltd.) was dispersed in 300 parts by mass of methyl ethyl ketone (MEK) to prepare a coating composition for surface coating. The coating composition thus obtained was coated on the periphery of a roller body having an elastic layer made of polyurethane foam to form a surface coating, whereby a developing roller was produced. Then, the developing roller thus obtained was evaluated for roller resistance, 10-point average roughness (Rz), Asker C hardness and toner charging performance by known methods. In addition, the image forming performance was evaluated by assembling the developing roller in a laser printer to perform printing. The developing roller was also assembled in the ink cartridge and k...

Embodiment 2

[0078] By adding 100 parts by mass of caprolactone-modified polyol (PCL210N, produced by Daicel Chemical Industries, Ltd., molecular weight: 1000), 35 parts by mass of carbon black, and 50 parts by mass of cyanurate-modified HDI (Coronate HX, Produced by Nippon Polyurethane Industry Co., Ltd.) was dispersed in 300 parts by mass of MEK to prepare a coating composition for surface coating. A developing roller was prepared by using the coating composition thus obtained instead of the coating composition prepared in Example 1, and then evaluated. The results are shown in Table 1.

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Abstract

There is a developing roller having a low compression permanent strain without contaminating a photosensitive drum and deteriorating toners. The developing roller (1) comprises a shaft (2), an elastic layer (3) formed on an outer periphery of the shaft (2) and a surface coating layer (4) formed on an outer peripheral face of the elastic layer (3), in which the surface coating layer (4) comprises a urethane resin formed by crosslinking a lactone-modified polyol with a polyisocyanate. The urethane resin is preferable to be formed by crosslinking the lactone-modified polyol with two or more kinds of polyisocyanates.

Description

technical field [0001] The present invention relates to a developing roller and an image forming apparatus including the developing roller, more particularly to a developing roller having low compression set and excellent resistance to toner melting during long-term use in a high-temperature, high-humidity environment, and comprising Such a developing roller is also an image forming device capable of forming excellent images. Background of the invention [0002] In an image forming device of an electrophotographic system such as a copier, a printer, etc., a developing method by pressure is a well-known developing method in which toner is supplied onto a photosensitive drum holding a latent image to pass through the latent image attached to the photosensitive drum. of toner develops a latent image. In this type of pressure developing method, for example, a photosensitive drum is charged to a certain voltage, and then an electrostatic latent image is formed on the photosensit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G15/08G03G15/00
Inventor 杉村考之河野耕太杉本卓郎田河宏高
Owner BRIDGESTONE CORP