JP4802652B2 - Manufacturing method of belt-like conductive member - Google Patents

Description

The present invention relates to a method for manufacturing a belt-like conductive member that is used while being stretched around a plurality of rolls in an image forming apparatus such as an electrophotographic copying machine or a printer.

  In general, belt-like conductive members such as intermediate transfer belts and transfer / conveying belts used in electrophotographic apparatuses eliminate image defects such as image unevenness and obtain a more beautiful image. The cleaning property is required so that the agent does not adhere to the belt surface, and the cleaning property can be ensured by bringing the cleaning member into contact with the surface (outer peripheral surface) of the belt-like conductive member. However, if the cleaning blade is pressed to ensure cleaning properties, the belt surface unevenness will be the starting point, causing problems with the discharge products, residual toner, and toner external additives adhering to the belt surface. The surface must be smooth.

In addition, when the cleaning blade is brought into pressure contact, a force for stopping the belt is generated in opposition to the driving force of the belt, and when this stopping force is increased, the elongation rate of the belt changes in the vicinity of the cleaning blade, There was a problem that slip occurred between the drive roll and an image defect.
On the other hand, in order to improve the smoothness of the belt surface, it is necessary to make the unevenness as small as possible when processing the back surface of the belt. Smoothing the back surface of the belt reduces the coefficient of friction and causes slippage with the drive roll. This causes image defects such as poor magnification.

To solve these problems, belt-like conductive members using a resin layer used on the surface of the conductive roll have been proposed (see, for example, Patent Documents 1 to 3), but these have a hard belt surface with a hardness of 140 gms. When transferring to the above paper, there is a problem that the resin does not deform along the paper at the paper edge portion, so that the resin layer on the surface cracks and the surface resin layer peels off, causing image defects. Also, when the plastic layer or softener is used to reduce the hardness of the resin layer, stickiness occurs on the surface, the belt surface has a high coefficient of friction and a force to stop the belt drive, and the belt near the cleaning blade There is a problem in that an image defect such as a magnification failure occurs due to the occurrence of a change in the elongation rate and slip between the drive roll. Further, the plasticizer or softener causes bleeding, contaminates the photoreceptor and the intermediate transfer member, and causes streak-like image defects.
JP 2000-352857 A JP 2001-38503 A Japanese Patent Laid-Open No. 10-186794

The present invention has been made in view of the above-described problems, and occurs when the belt is stretched by a plurality of rolls including a drive roll in the image forming apparatus, and changes in the belt elongation rate and between the drive rolls. It aims to generation of slips without, to provide a manufacturing how the transfer uniformity of the developer is improved belt-shaped conductive member.

As a result of intensive studies, the present inventors have found that the above problems can be solved by defining the friction coefficients of the belt outer peripheral surface and the inner peripheral surface, and have completed the present invention .

That is, the present invention
< 1 > A method for producing a belt-like conductive member in which at least an outermost surface layer is formed on the outer peripheral surface of an elastic body layer, a cross-linking step for cross-linking the belt-like elastic body layer, and elasticity after the cross-linking step. After polishing the inner peripheral surface of the body layer, polishing the outer peripheral surface of the elastic body layer and polishing the inner peripheral surface of the elastic body layer again, and the outermost surface on the outer peripheral surface of the elastic body layer after the polishing step An outermost surface layer forming step of forming a layer, and a method for producing a belt-like conductive member.

In the present invention, in the image forming apparatus, when stretched by a plurality of rolls including a driving roll, there is no change in the belt extension rate and no slip generated between the driving roll and the transfer of the developer. it is possible to provide a manufacturing how uniformity is improved belt-shaped conductive member.

The belt-like conductive member of the present invention is a belt-like conductive member in which at least the outermost surface layer is formed on the outer peripheral surface of the elastic layer, and the friction coefficient of the outer peripheral surface of the belt-like conductive member is 0. It is 1 or more and 0.3 or less, and the friction coefficient of the inner peripheral surface of a belt-like conductive member is 0.4 or more and 1.0 or less.
In order to obtain a desired belt-like conductive member, the present inventors have conducted extensive research focusing on the characteristics of the outer peripheral surface of the belt and the inner peripheral surface of the belt, and in the process, reduced the friction coefficient of the outer peripheral surface of the belt. We thought that good results could be obtained by increasing the friction coefficient of the inner peripheral surface of the belt, and continued research and development. Then, by adjusting the friction coefficient of the outer peripheral surface to 0.1 or more and 0.3 or less and adjusting the friction coefficient of the inner peripheral surface to 0.4 or more and 1.0 or less, driving is performed in the image forming apparatus. It has been found that when the belt is stretched by a plurality of rolls including a roll, there is no change in the belt extension rate and no slip is generated between the roll and the drive, and the transfer uniformity of the developer can be improved. .

The configuration of the belt-like conductive member of the present invention is shown in FIG. The belt-like conductive member of the present invention is configured by forming the outermost surface layer 4 on the outer peripheral surface of the elastic body layer 2. An intermediate layer may be formed between the elastic layer 2 and the outermost surface layer 4.
The friction coefficient of the outer peripheral surface of the belt-like conductive member of the present invention must be 0.1 or more and 0.3 or less, preferably 0.13 or more and 0.27 or less, and preferably 0.16 or more and 0 or less. More preferably, it is 24 or less. If the friction coefficient of the outer peripheral surface of the belt-like conductive member of the present invention is less than 0.1, the conveyance force of the paper is lowered or the developer cannot be held on the belt, and an image defect occurs. If exceeded, the friction with the abutting photoreceptor or cleaning blade increases, and in the image forming apparatus, when stretched by a plurality of rolls including the drive roll, the change in the belt extension rate and the drive roll No slip is generated between the two, and the effect of improving the transfer uniformity of the developer cannot be obtained.

  Further, the friction coefficient of the inner peripheral surface of the belt-like conductive member of the present invention must be 0.4 or more and 1.0 or less, preferably 0.45 or more and 0.9 or less. More preferably, it is 5 or more and 0.8 or less. When the friction coefficient of the inner peripheral surface of the belt-like conductive member of the present invention is less than 0.4, the friction with the drive roll is reduced, and the belt is stretched by a plurality of rolls including the drive roll in the image forming apparatus. In this case, there is no change in the belt elongation rate and the occurrence of slip between the driving roll and the effect of improving the transfer uniformity of the developer cannot be obtained. Developer or the like is likely to adhere, causing slip.

As shown in FIG. 2, the friction coefficient of the outer peripheral surface of the belt-shaped conductive member of the present invention is obtained by applying a flat metal plate (material: SUS304, surface roughness Ra: 0.1 μm to 0.2 μm) 22 to the belt-shaped conductive material. The outer peripheral surface of the belt-like conductive member 20 and the friction coefficient measuring device 24 measured by placing the friction coefficient measuring device (HEIDON tribogear muse 94iII) 24 on the belt-like conductive member 20 belt. It is a friction coefficient with the metal measuring element 26 of.
On the other hand, the friction coefficient of the inner peripheral surface of the belt-like conductive member of the present invention is as follows on a flat metal plate (material: SUS304, surface roughness Ra: 0.1 μm to 0.2 μm) 22, as shown in FIG. The belt-like conductive member 20 is placed on the belt, and the friction coefficient measuring machine (HEIDON tribogear muse 94iII) 24 is placed inside the belt, and the metal measurement of the friction coefficient measuring machine 24 and the inner peripheral surface of the belt-like conductive member 20 is performed. It is a friction coefficient with the child 26.

The volume resistivity of the belt-like conductive member of the present invention is a volume resistivity at 25 ° C., preferably 1.0 × 10 ^{4 to} 1.0 × 10 ¹² Ω · cm, and further, an intermediate transfer belt. Is preferably 1.0 × 10 ^{7 to} 1.0 × 10 ¹¹ Ω · cm, and 5.0 × 10 ^{4 to} 1.0 × 10 ¹⁰ Ω · cm when used as a transfer conveyance belt. It is preferable that
The volume resistivity of the belt-like conductive member of the present invention is 25 ° C. The electrode (advantest R12702A / B resilience chamber) is inserted into the belt and the belt outer peripheral surface is placed. A ring-shaped earth electrode is further mounted on the same axis as the electrode, and a high resistance measuring instrument (manufactured by Advantest, R8340A digital high resistance / microammeter) is connected to the electrode and the ring-shaped ground electrode, and an applied voltage of 1000 V is applied. The resistance value after charging for 10 seconds was obtained.

  The elastic body layer 2 is preferably made of a rubber elastic body. The material of the rubber elastic body is a diene or non-diene rubber elastic body, which may be solid or liquid, and is acrylic rubber, isoprene rubber, butadiene rubber, ethylene-propylene copolymer rubber, acrylonitrile-butadiene rubber. Styrene-butadiene rubber, epichlorohydrin copolymer rubber, urethane rubber, silicone rubber, butyl rubber, chloroprene rubber, norbornene, among others, ethylene-propylene copolymer rubber, acrylonitrile-butadiene rubber, styrene-butadiene rubber, epichlorohydrin copolymer rubber. Chloroprene rubber is preferred. These elastic bodies can be used alone or in admixture of two or more.

  The volume resistivity of the rubber elastic body can be adjusted with a conductive agent such as carbon black. Furthermore, if necessary, materials that can be usually added to rubber, such as softeners, plasticizers, curing agents, vulcanizing agents, vulcanization accelerators, anti-aging agents, fillers such as silica and calcium carbonate, and the like may be added.

  On the other hand, the outermost surface layer 4 preferably contains a resin, and examples of the resin constituting the outermost surface layer 4 include urethane resin, polyester, phenol, acrylic, polyurethane, epoxy resin, cellulose, copolymer nylon, and the like. And urethane resin, polyester, and copolymer nylon are preferable. Among these, the copolymer nylon includes one or more of 610 nylon, 11 nylon, and 12 nylon as polymerized units, and the other polymerized units contained in the copolymer include: Examples include 6 nylon and 66 nylon. Here, it is preferable that the proportion of polymer units composed of 610 nylon, 11 nylon, and 12 nylon contained in the copolymer is 10% or more in total by mass ratio. When the polymerized unit is 10% or more, it is excellent in liquid preparation and film-forming properties at the time of coating the surface layer, and in particular, wear of the resin layer during repeated use and adhesion of foreign matter to the resin layer are small, and the durability of the belt In addition, the hygroscopicity is low, and the change in properties due to the environment is reduced.

The outermost surface layer 4 may contain a particulate conductive agent. The particulate conductive agent is preferably a conductive material having a particle size of 3 μm or less and a volume resistivity of 10 ⁹ Ωcm or less. For example, fine particles made of metal oxides such as tin oxide, titanium oxide, zinc oxide, CeO ₂ , ZrO ₂ , In ₂ O ₃ or alloys thereof, or these metals on the surface of fine particles such as BaSO ₄ or TiO _2. An oxide-coated one or carbon black can be used.
In order to obtain the desired volume resistance value of the belt, the volume resistance value of the outermost surface layer 4 is preferably 10 ⁹ Ω · cm or more, and the amount of the particulate conductive agent added varies depending on the conductive particles to be added, but the above-mentioned maximum If it is resin described as resin which comprises the surface layer 4, it is preferable to make addition amount into 0%-150% with respect to resin solid content.
Further, a fluorine-based or silicone-based resin or fine particles may be added to the outermost surface layer 4, and in this case, the surface becomes hydrophobic and acts to prevent the adhesion of foreign matters to the belt surface. . It is also possible to add a coupling agent in order to improve the adhesion with the lower layer.

  In the belt-like conductive member of the present invention, an intermediate layer may be formed between the elastic body layer 2 and the outermost surface layer 4. The intermediate layer is provided as a resistance adjustment or base, and is preferably a material that can be used for the rubber elastic body material and the resin constituting the outermost surface layer. Further, the rubber includes ethylene-propylene copolymer rubber, acrylonitrile. -Butadiene rubber, styrene-butadiene rubber, epichlorohydrin copolymer rubber, and chloroprene rubber are preferable, and as the resin, urethane resin, polyester, copolymer nylon, and the like are preferable.

  The belt-like conductive member of the present invention preferably has a hardness at 25 ° C. of 65 to 85, and more preferably 70 to 80. If the hardness is greater than 85, cracks may occur on the belt surface when the belt is extended, and if it is less than 65, a force is generated to stop the belt against the driving force of the belt, If this static force increases, the belt elongation rate may change in the vicinity of the cleaning blade, or slip may occur with the drive roll, causing image defects. The hardness can be measured, for example, by using an Asker MD-1 hardness meter manufactured by Nippon Kobunshi Keiki Co., Ltd.

  The method for manufacturing a belt-shaped conductive member of the present invention is a method for manufacturing a belt-shaped conductive member in which at least the outermost surface layer is formed on the outer peripheral surface of the elastic layer, and the belt-shaped elastic layer is crosslinked. A polishing step, a polishing step of polishing the outer peripheral surface of the elastic layer after polishing the inner peripheral surface of the elastic layer after the cross-linking step, and a polishing step of polishing the inner peripheral surface of the elastic layer again And an outermost surface layer forming step of forming an outermost surface layer on the outer peripheral surface of the elastic body layer.

  The belt-like elastic body layer is prepared by kneading materials and compounding agents such as rubber elastic bodies using a kneader such as a Banbury mixer, a kneader, or a two-roll to produce a mixture, and extruding the produced mixture. It is obtained by pre-molding into a tube shape using, then coating on a cylindrical mold, vulcanizing, and then removing from the mold.

The obtained belt-like elastic body layer is crosslinked by a method such as steam vulcanization, press vulcanization, transfer vulcanization, and hot air vulcanization to produce a cylindrical molded product (crosslinking step).
The steam vulcanization is a method in which pressurized steam is filled in a vulcanizing can and vulcanized by applying heat and pressure to an elastic body layer covered with a cylindrical mold.
The press vulcanization is a method in which an elastic body layer coated on a cylindrical mold is placed in a press mold and sandwiched by a press and vulcanized by applying heat and pressure.
The hot air vulcanization is a method in which an elastic body layer covered with a cylindrical mold is placed in a high temperature chamber and vulcanized by applying heat.

The obtained cylindrical molded product is polished as a polishing step with an NC grinder or the like (first polishing step), then the outer peripheral surface of the elastic layer is polished (second polishing step), and again The inner peripheral surface of the elastic layer is polished (third polishing step).
In order to obtain the belt-shaped conductive member of the present invention, it is preferable to smooth the outer peripheral surface of the cylindrical molded product and roughen the inner peripheral surface so that the apparent contact area increases. However, if the outer peripheral surface is polished after roughening the inner peripheral surface, the smoothness of the surface is lost, and cracks are generated on the surface of the cylindrical molded product at an early stage. Therefore, in the polishing step of the present invention, the inner peripheral surface of the cylindrical molded product is smoothed by polishing, and then the outer peripheral surface of the cylindrical molded product is smoothed by polishing, and again the cylindrical molded product It is roughened by polishing the inner peripheral surface, and both smoothness of the outer peripheral surface and rough surface properties of the inner peripheral surface are achieved. In these first to third polishing steps, the friction coefficient and surface smoothness can be changed according to conditions such as the type of grindstone, the number of revolutions of the workpiece, the number of revolutions of the grindstone, and the feed rate. Each polishing process will be described below.

  As described above, the first polishing step is a step for smoothing the inner peripheral surface of the cylindrical molded product, whereby the outer peripheral surface of the cylindrical molded product can be easily obtained in the next second polishing step. Can be smoothed. In the first polishing step, the gloss value at an incident angle of 85 ° on the inner peripheral surface is preferably 30 to 40, and more preferably 33 to 38.

  As described above, the second polishing step is a step for smoothing the outer peripheral surface of the cylindrical molded product. In the second polishing step, the gloss value at an incident angle of 85 ° on the outer peripheral surface is preferably 30 to 40, and more preferably 34 to 39.

  As described above, the third polishing step is a step for roughening the inner peripheral surface of the cylindrical molded product. In the second polishing step, the gloss value at an incident angle of 85 ° on the inner peripheral surface is preferably 4 to 10, and more preferably 5 to 9.

  The outermost surface layer forming step is a step for improving the smoothness of the surface of the belt-like conductive member. The outermost surface layer can be formed by coating the resin so that the thickness of the outermost surface layer is 3 to 10 μm by spray coating, dip coating, or the like, thereby obtaining the desired friction coefficient of the outer peripheral surface. . In the case of spray coating, the thickness can be controlled by adjusting the amount of paint discharged.

  The belt-like conductive member of the present invention described above is preferably obtained by the above-described method for producing a belt-shaped conductive member of the present invention.

An image forming apparatus of the present invention is an image forming apparatus comprising at least a photosensitive member and a belt-like conductive member stretched around a plurality of rolls including a drive roll, wherein the belt-like conductive member is already present. It is a belt-like conductive member of the present invention described above.
The principal part of an example of the image forming apparatus of the present invention is shown in FIG. As shown in FIG. 4, an example of the image forming apparatus of the present invention includes a photoreceptor 30 and a transfer conveyance belt 32 stretched around a drive roll 34 and a driven roll 36.

In an example of the image forming apparatus of the present invention, after holding the recording paper 40 on the transfer conveyance belt 32, the toner image on the photoreceptor 30 is transferred to the recording paper 40 on the transfer conveyance belt 32 by the transfer roll 38, Further, the recording paper 40 can be conveyed.
The photoreceptor used in the image forming apparatus of the present invention is not particularly limited, and examples thereof include those composed of a phenol derivative having a methylol group on the surface. Examples of the phenol derivative having a methylol group include monomers of monomethylolphenols, dimethylolphenols or trimethylolphenols, mixtures thereof, oligomers thereof, or mixtures of these monomers and oligomers. Such phenol derivatives having a methylol group include resorcin, bisphenol, etc., substituted phenols containing one hydroxyl group such as phenol, cresol, xylenol, paraalkylphenol, paraphenylphenol, and two hydroxyl groups such as catechol, resorcinol, hydroquinone, etc. It is obtained by reacting a compound having a phenol structure, such as substituted phenols, bisphenol A, bisphenol Z, and the like having a phenol structure with formaldehyde, paraformaldehyde, etc. in the presence of an acid catalyst or an alkali catalyst, Generally what is marketed as a phenol resin can also be used.

The image forming apparatus of the present invention uses the belt-like conductive member of the present invention as the transfer conveyance belt 32, so that when the image forming apparatus is stretched by a plurality of rolls including a drive roll in the image forming apparatus, the belt elongation rate And the occurrence of slip between the driving roll and the transfer uniformity of the developer can be improved.
The image forming apparatus of the present invention preferably includes a cleaning blade 50 for cleaning the transfer / conveying belt 32 after the recording paper 40 is conveyed as shown in FIG. Since the transfer conveyance belt 32 which is a belt-like conductive member of the present invention has a friction coefficient controlled on the outer peripheral surface and the inner peripheral surface, even if the cleaning blade 50 is pressed against the transfer conveyance belt 32 for cleaning, the belt There is no change in the elongation rate and the occurrence of slip between the drive roll and cleaning can be performed preferably.

  Examples of the cleaning blade 50 used in the image forming apparatus of the present invention include a cleaning blade made of blade-like rubber that is used by being attached to a holding member 52. The blade-like rubber may be a single layer or multiple layers. It may be. In addition, the cleaning blade 50 may have a hardness different from that of the other parts constituting the cleaning blade 50 only at the part in contact with the member to be cleaned (for example, the belt-like conductive member of the present invention). In this case, only the layer in contact with the cleaning symmetrical member may have a hardness different from that of the other layers. The rubber used as the cleaning blade 50 is preferably the rubber used for the elastic layer described above, and urethane rubber is particularly preferable.

  The transfer roll 38 used in the image forming apparatus of the present invention preferably has a configuration having an elastic layer on a metal core, and this elastic layer is made of a rubber foam used for the elastic layer described above. Among them, a foam obtained by mixing ethylene-propylene copolymer rubber, acrylonitrile-butadiene rubber, styrene-butadiene rubber, epichlorohydrin copolymer rubber, or chloroprene rubber alone or in combination of two or more kinds is preferable.

  As the driving roll 34 used in the image forming apparatus of the present invention, it is preferable to use a metal roll.

  In the image forming apparatus of the present invention, the structure of the charging device 42, the exposure device 44, the developing device 46, the cleaning member 48 for cleaning the photosensitive member 30, and the like are the same as those of the conventional electrophotographic image forming device. it can.

  As described above, the case where the belt-like conductive member of the present invention is used for the transfer conveyance belt has been described, but the same effect can be obtained even if the belt-shaped conductive member of the present invention is used for the intermediate transfer belt.

EXAMPLES Hereinafter, although an Example demonstrates this invention concretely, this invention is not limited to a following example.
<Example 1>
100 parts by mass of chloroprene (ES-40 manufactured by Denki Kagaku Kogyo Co., Ltd.), 40 parts by mass of Asahi Thermal (manufactured by Asahi Carbon Co., Ltd.), 8 parts by mass of Ketjen Black EC, 4 parts by mass of magnesium oxide (Kyowa Mag 150 manufactured by Kyowa Chemical Industry Co., Ltd.) , 0.5 parts by mass of sulfur (200 mesh manufactured by Tsurumi Chemical Co., Ltd.), 2.0 parts by mass of a vulcanization accelerator (manufactured by Ouchi Shinsei Chemical Co., Ltd. Noxeller TS: 1.0 part by mass, Noxeller DT: 1.0 mass Part) and a mixture kneaded with an open roll is coated on a metal pipe with a diameter of 95 mm in a cylindrical shape with a thickness of 1.0 mm, placed in a vulcanizing can and vulcanized at 170 ° C. for 30 minutes, and then a metallic pipe A cylindrical shaped product was obtained by extracting from the product. The inner peripheral surface of the obtained cylindrical molded product was polished by an NC polishing machine (manufactured by Mizuguchi Seisakusho), and the gloss value at an incident angle of 85 ° on the inner peripheral surface was set to 33.8. Next, the outer peripheral surface of the cylindrical molded product was polished by an NC polishing machine (manufactured by Mizuguchi Seisakusho), and the gloss value at an incident angle of 85 ° on the outer peripheral surface was set to 36.4. After that, the inner peripheral surface of the cylindrical molded product is polished by an NC polishing machine (manufactured by Mizuguchi Seisakusho), and the gross value at an incident angle of 85 ° on the inner peripheral surface is 8.7, and the cylindrical shape has a thickness of 0.47 mm. The molded product was obtained.

The outer peripheral surface of the cylindrical molded product polished as described above is coated with a coating solution of JLY-601 ESD (manufactured by Nippon Atsson Co., Ltd.) for forming the outermost surface layer by spray coating, and baked at 140 ° C. for 30 minutes. An outermost surface layer was formed to obtain a belt-like conductive member. The thickness of the outermost surface layer at this time was 5.0 μm. The friction coefficient of the outer peripheral surface of the belt-like conductive member measured by the method described above was 0.21, and the friction coefficient of the inner peripheral surface was 0.65. Further, the hardness of the belt-like conductive member at 25 ° C. was measured using an Asker MD-1 type hardness meter. As a result, it was 77. Furthermore, the volume resistivity at 25 ° C. measured by the method described above was 8.0 × 10 ⁶ Ω · cm.

  The belt-like conductive member thus produced is attached to a transfer conveyance belt of DocuCentre a1100 (manufactured by Fuji Xerox Co., Ltd.). After a time running test, a printing test was conducted using A4 size J paper (manufactured by Fuji Xerox Office Supply) as recording paper under the same temperature of 22 ° C. and humidity of 55%. The initial image quality after printing 10,000 sheets, and the stain on the surface of the transfer conveyance belt were evaluated. Furthermore, the paper transportability was evaluated. The results are shown in Table 1. The DocuCentre a1100 is provided with a cleaning blade for cleaning the photosensitive member and the transfer conveyance belt, and the transfer conveyance belt is installed in a stretched state on a plurality of rolls including a drive roll.

<Example 2>
70 parts by mass of chloroprene (ES-40 manufactured by Denki Kagaku Kogyo Co., Ltd.), 30 parts by mass of an ethylene propylene copolymer (EP-33 manufactured by JSR), 40 parts by mass of Asahi Thermal (manufactured by Asahi Carbon Co., Ltd.), 8 masses of ketjen black EC Part, magnesium oxide (Kyowa Chemical Industry Co., Ltd. Kyowa Mag 150) 4 parts by mass, sulfur (Tsurumi Chemical Co., Ltd. 200 mesh) 0.5 parts by mass, vulcanization accelerator 2.0 parts by mass (Ouchi Shinsei Chemical Industry Co., Ltd.) Noxeller TS: 1.0 part by mass, Noxeller DT: 1.0 part by mass), and the mixture kneaded with an open roll is coated on a metal pipe with a diameter of 95 mm in a cylindrical shape with a thickness of 1.0 mm, and a vulcanized can It was vulcanized at 170 ° C. for 30 minutes and extracted from a metallic pipe to obtain a cylindrical molded product. The inner peripheral surface of the obtained cylindrical molded product was polished by an NC polishing machine (manufactured by Mizuguchi Seisakusho), and the gloss value at an incident angle of 85 ° on the inner peripheral surface was set to 34.7. Next, the outer peripheral surface of the cylindrical molded product was polished by an NC polishing machine (manufactured by Mizuguchi Seisakusho), and the gloss value at an incident angle of 85 ° on the outer peripheral surface was set to 34.1. Thereafter, the inner peripheral surface of the cylindrical molded product is polished by an NC polishing machine (manufactured by Mizuguchi Seisakusho), and the gross value at an incident angle of 85 ° on the inner peripheral surface is set to 8.4, and the cylindrical shape has a thickness of 0.47 mm. The molded product was obtained.

The outer peripheral surface of the cylindrical molded product polished as described above is coated with a coating solution of JLY-601 ESD (manufactured by Nippon Atsson Co., Ltd.) for forming the outermost surface layer by spray coating, and baked at 140 ° C. for 30 minutes. An outermost surface layer was formed to obtain a belt-like conductive member. The thickness of the outermost surface layer at this time was 5.0 μm. The friction coefficient of the outer peripheral surface of the obtained belt-like conductive member measured in the same manner as in Example 1 was 0.19, and the friction coefficient of the inner peripheral surface was 0.50. Further, the hardness of the belt-like conductive member was measured in the same manner as in Example 1. As a result, it was 78. Furthermore, the volume resistivity at 25 ° C. measured in the same manner as in Example 1 was 7.4 × 10 ⁵ Ω · cm.
The belt-like conductive member thus produced was evaluated in the same manner as in Example 1 for the initial image quality after printing 10,000 sheets, the contamination on the surface of the transfer conveyance belt, and the sheet conveyance property. The results are shown in Table 1.

<Example 3>
70 parts by mass of chloroprene (ES-40 manufactured by Denki Kagaku Kogyo Co., Ltd.), 30 parts by mass of epichlorohydrin copolymer (Zeklon 3106 manufactured by Nippon Zeon Co., Ltd.), 40 parts by mass of Asahi Thermal (Asahi Carbon Co., Ltd.), 8 parts by mass of Ketjen Black EC , Magnesium oxide (Kyowa Chemical Industry Kyowa Mag 150) 4 parts by mass, Sulfur (Tsurumi Chemical Co., Ltd. 200 mesh) 0.5 parts by mass, Vulcanization accelerator 2.0 parts by mass (Ouchi Shinsei Chemical Co., Ltd. Noxeller) TS: 1.0 part by mass, NOXELLER DT: 1.0 part by mass), and the mixture kneaded with an open roll is coated on a metal pipe having a diameter of 95 mm in a cylindrical shape with a thickness of 1.0 mm, and then vulcanized. The mixture was vulcanized at 170 ° C. for 30 minutes and extracted from a metallic pipe to obtain a cylindrical molded product. The inner peripheral surface of the obtained cylindrical molded product was polished by an NC polishing machine (manufactured by Mizuguchi Seisakusho), and the gloss value at an incident angle of 85 ° on the inner peripheral surface was set to 33.4. Next, the outer peripheral surface of the cylindrical molded product was polished by an NC polishing machine (manufactured by Mizuguchi Seisakusho), and the gloss value at an incident angle of 85 ° on the outer peripheral surface was set to 36.2. Thereafter, the inner peripheral surface of the cylindrical molded product is polished by an NC polishing machine (manufactured by Mizuguchi Seisakusho), and the gross value at an incident angle of 85 ° on the inner peripheral surface is 6.2, and the cylindrical shape has a thickness of 0.47 mm. The molded product was obtained.

The outer peripheral surface of the cylindrical molded product polished as described above is coated with a coating solution of JLY-601 ESD (manufactured by Nippon Atsson Co., Ltd.) for forming the outermost surface layer by spray coating, and baked at 140 ° C. for 30 minutes. An outermost surface layer was formed to obtain a belt-like conductive member. The thickness of the outermost surface layer at this time was 5.0 μm. The friction coefficient of the outer peripheral surface of the obtained belt-like conductive member measured in the same manner as in Example 1 was 0.21, and the friction coefficient of the inner peripheral surface was 0.58. Further, the hardness of the belt-like conductive member was measured in the same manner as in Example 1. As a result, it was 77. Furthermore, the volume resistivity at 25 ° C. measured in the same manner as in Example 1 was 6.3 × 10 ⁶ Ω · cm.
The belt-like conductive member thus produced was evaluated in the same manner as in Example 1 for the initial image quality after printing 10,000 sheets, the contamination on the surface of the transfer conveyance belt, and the sheet conveyance property. The results are shown in Table 1.

<Example 4>
70 parts by mass of chloroprene (ES-40 manufactured by Denki Kagaku Kogyo Co., Ltd.), 30 parts by mass of epichlorohydrin copolymer (Zeklon 3106 manufactured by Nippon Zeon Co., Ltd.), 40 parts by mass of Asahi Thermal (Asahi Carbon Co., Ltd.), 8 parts by mass of Ketjen Black EC , Magnesium oxide (Kyowa Chemical Industry Kyowa Mag 150) 4 parts by mass, Sulfur (Tsurumi Chemical Co., Ltd. 200 mesh) 0.5 parts by mass, Vulcanization accelerator 2.0 parts by mass (Ouchi Shinsei Chemical Co., Ltd. Noxeller) TS: 1.0 part by mass, NOXELLER DT: 1.0 part by mass), and the mixture kneaded with an open roll is coated on a metal pipe having a diameter of 95 mm in a cylindrical shape with a thickness of 1.0 mm, and then vulcanized. The mixture was vulcanized at 170 ° C. for 30 minutes and extracted from a metallic pipe to obtain a cylindrical molded product. The inner peripheral surface of the obtained cylindrical molded product was polished by an NC polishing machine (manufactured by Mizuguchi Seisakusho), and the gloss value at an incident angle of 85 ° of the inner peripheral surface was set to 37.9. Next, the outer peripheral surface of the cylindrical molded product was polished by an NC polishing machine (manufactured by Mizuguchi Seisakusho), and the gloss value at an incident angle of 85 ° on the outer peripheral surface was set to 38.1. After that, the inner peripheral surface of the cylindrical molded product is polished by an NC polishing machine (manufactured by Mizuguchi Seisakusho), and the gross value at an incident angle of 85 ° on the inner peripheral surface is set to 5.7, and the cylindrical shape has a thickness of 0.47 mm. The molded product was obtained.

The outer peripheral surface of the cylindrical molded product polished as described above is coated with a coating solution of JLY-601 ESD (manufactured by Nippon Atsson Co., Ltd.) for forming the outermost surface layer by spray coating, and baked at 140 ° C. for 30 minutes. An outermost surface layer was formed to obtain a belt-like conductive member. The thickness of the outermost surface layer at this time was 5.0 μm. The friction coefficient of the outer peripheral surface of the obtained belt-like conductive member measured in the same manner as in Example 1 was 0.23, and the friction coefficient of the inner peripheral surface was 0.46. Further, the hardness of the belt-like conductive member was measured in the same manner as in Example 1. As a result, it was 77. Furthermore, the volume resistivity at 25 ° C. measured in the same manner as in Example 1 was 5.2 × 10 ⁶ Ω · cm.
The belt-like conductive member thus produced was evaluated in the same manner as in Example 1 for the initial image quality after printing 10,000 sheets, the contamination on the surface of the transfer conveyance belt, and the sheet conveyance property. The results are shown in Table 1.

<Comparative Example 1>
100 parts by mass of chloroprene (ES-40 manufactured by Denki Kagaku Kogyo Co., Ltd.), 40 parts by mass of Asahi Thermal (manufactured by Asahi Carbon Co., Ltd.), 8 parts by mass of Ketjen Black EC, 4 parts by mass of magnesium oxide (Kyowa Mag 150 manufactured by Kyowa Chemical Industry Co., Ltd.) 0.5 parts by mass of sulfur (200 mesh manufactured by Tsurumi Chemical Industry Co., Ltd.), 2.0 parts by mass of vulcanization accelerator (manufactured by Ouchi Shinsei Chemical Co., Ltd. Noxeller TS: 1.0 part by mass, Noxeller DT: 1.0 part by mass) ), And the mixture kneaded with an open roll is coated on a metal pipe with a diameter of 95 mm in a cylindrical shape with a thickness of 1.0 mm, placed in a vulcanizing can and vulcanized at 170 ° C. for 30 minutes, and then extracted from the metal pipe A cylindrical molded product was obtained. The inner peripheral surface of the obtained cylindrical molded product was polished by an NC polishing machine (manufactured by Mizuguchi Seisakusho), and the gloss value at an incident angle of 85 ° on the inner peripheral surface was set to 36.9. Next, the outer peripheral surface of the cylindrical molded product is polished by an NC polishing machine (manufactured by Mizuguchi Seisakusho), the gloss value at an incident angle of 85 ° on the outer peripheral surface is 33.5, and the cylindrical molded product is 0.47 mm thick. Got.

The outer peripheral surface of the cylindrical molded product polished as described above is coated with a coating solution of JLY-601 ESD (manufactured by Nippon Atsson Co., Ltd.) for forming the outermost surface layer by spray coating, and baked at 140 ° C. for 30 minutes. An outermost surface layer was formed to obtain a belt-like conductive member. The thickness of the outermost surface layer at this time was 5.0 μm. The friction coefficient of the outer peripheral surface of the obtained belt-like conductive member measured in the same manner as in Example 1 was 0.22, and the friction coefficient of the back surface was 0.21. Further, the hardness of the belt-like conductive member was measured in the same manner as in Example 1. As a result, it was 77. Furthermore, the volume resistivity at 25 ° C. measured in the same manner as in Example 1 was 5.7 × 10 ⁶ Ω · cm.
The belt-like conductive member thus produced was evaluated in the same manner as in Example 1 for the initial image quality after printing 10,000 sheets, the contamination on the surface of the transfer conveyance belt, and the sheet conveyance property. The results are shown in Table 1.

<Comparative example 2>
70 parts by mass of chloroprene (ES-40 manufactured by Denki Kagaku Kogyo Co., Ltd.), 30 parts by mass of ethylene propylene copolymer (EP-33 manufactured by JSR), 40 parts by mass of Asahi Thermal (Asahi Carbon Co., Ltd.), 8 masses of Ketjen Black EC Part, magnesium oxide (Kyowa Chemical Industry Co., Ltd. Kyowa Mag 150) 4 parts by mass, sulfur (Tsurumi Chemical Co., Ltd. 200 mesh) 0.5 parts by mass, vulcanization accelerator 2.0 parts by mass (Ouchi Shinsei Chemical Industry Co., Ltd.) Noxeller TS: 1.0 part by mass, Noxeller DT: 1.0 part by mass), and the mixture kneaded with an open roll is coated on a metal pipe with a diameter of 95 mm in a cylindrical shape with a thickness of 1.0 mm, and a vulcanized can It was vulcanized at 170 ° C. for 30 minutes and extracted from a metallic pipe to obtain a cylindrical molded product. The inner peripheral surface of the obtained cylindrical molded product was polished by an NC polishing machine (manufactured by Mizuguchi Seisakusho), and the gloss value at an incident angle of 85 ° on the inner peripheral surface was set to 43.0. Next, the outer peripheral surface of the cylindrical molded product is polished by an NC polishing machine (manufactured by Mizuguchi Seisakusho), and the gloss value at an incident angle of 85 ° on the outer peripheral surface is set to 42.5, and the cylindrical molded product having a thickness of 0.47 mm. Got.

The outer peripheral surface of the cylindrical molded product polished as described above is coated with a coating solution of JLY-601 ESD (manufactured by Nippon Atsson Co., Ltd.) for forming the outermost surface layer by spray coating, and baked at 140 ° C. for 30 minutes. An outermost surface layer was formed to obtain a belt-like conductive member. The thickness of the outermost surface layer at this time was 5.0 μm. The friction coefficient of the outer peripheral surface of the obtained belt-like conductive member measured in the same manner as in Example 1 was 0.23, and the friction coefficient of the inner peripheral surface was 0.17. Further, the hardness of the belt-like conductive member was measured in the same manner as in Example 1. As a result, it was 77. Furthermore, the volume resistivity at 25 ° C. measured in the same manner as in Example 1 was 7.9 × 10 ⁵ Ω · cm.
The belt-like conductive member thus produced was evaluated in the same manner as in Example 1 for the initial image quality after printing 10,000 sheets, the contamination on the surface of the transfer conveyance belt, and the sheet conveyance property. The results are shown in Table 1.

<Comparative Example 3>
70 parts by mass of chloroprene (ES-40 manufactured by Denki Kagaku Kogyo), 30 parts by mass of epichlorohydrin copolymer (Zeklon 3106 manufactured by Nippon Zeon Co., Ltd.), 40 parts by mass of Asahi Thermal (Asahi Carbon Co., Ltd.), 8 parts by mass of Ketjen Black EC , Magnesium oxide (Kyowa Chemical Industry Kyowa Mag 150) 4 parts by mass, Sulfur (Tsurumi Chemical Co., Ltd. 200 mesh) 0.5 parts by mass, Vulcanization accelerator 2.0 parts by mass (Ouchi Shinsei Chemical Co., Ltd. Noxeller) TS: 1.0 part by mass, NOXELLER DT: 1.0 part by mass), and the mixture kneaded with an open roll is coated on a metal pipe having a diameter of 95 mm in a cylindrical shape with a thickness of 1.0 mm, and then vulcanized. The mixture was vulcanized at 170 ° C. for 30 minutes and extracted from a metallic pipe to obtain a cylindrical molded product. The inner peripheral surface of the obtained cylindrical molded product was polished by an NC polishing machine (manufactured by Mizuguchi Seisakusho), and the gloss value at an incident angle of 85 ° on the inner peripheral surface was set to 34.8. Next, the outer peripheral surface of the cylindrical molded product is polished by an NC polishing machine (manufactured by Mizuguchi Seisakusho), the gross value of the incident angle of 85 ° of the outer peripheral surface is 39.7, and the cylindrical molded product having a thickness of 0.47 mm. Got.

The outer peripheral surface of the cylindrical molded product polished as described above is coated with a coating solution of JLY-601 ESD (manufactured by Nippon Atsson Co., Ltd.) for forming the outermost surface layer by spray coating, and baked at 140 ° C. for 30 minutes. An outermost surface layer was formed to obtain a belt-like conductive member. The thickness of the outermost surface layer at this time was 5.0 μm. The friction coefficient of the outer peripheral surface of the obtained belt-like conductive member measured in the same manner as in Example 1 was 0.19, and the friction coefficient of the inner peripheral surface was 0.23. Further, the hardness of the belt-like conductive member was measured in the same manner as in Example 1. As a result, it was 78. Furthermore, the volume resistivity at 25 ° C. measured in the same manner as in Example 1 was 7.3 × 10 ⁶ Ω · cm.
The belt-like conductive member thus produced was evaluated in the same manner as in Example 1 for the initial image quality after printing 10,000 sheets, the contamination on the surface of the transfer conveyance belt, and the sheet conveyance property. The results are shown in Table 1.

<Comparative example 4>
100 parts by mass of chloroprene (ES-40 manufactured by Denki Kagaku Kogyo Co., Ltd.), 40 parts by mass of Asahi Thermal (manufactured by Asahi Carbon Co., Ltd.), 8 parts by mass of Ketjen Black EC, 4 parts by mass of magnesium oxide (Kyowa Mag 150 manufactured by Kyowa Chemical Industry Co., Ltd.) 0.5 parts by mass of sulfur (200 mesh manufactured by Tsurumi Chemical Industry Co., Ltd.), 2.0 parts by mass of vulcanization accelerator (manufactured by Ouchi Shinsei Chemical Co., Ltd. Noxeller TS: 1.0 part by mass, Noxeller DT: 1.0 part by mass) ) Is kneaded with an open roll on a metal pipe with a diameter of 95 mm, coated in a cylindrical shape with a thickness of 1.0 mm, placed in a vulcanizing can, vulcanized at 170 ° C. for 30 minutes, extracted from the metallic pipe and cylindrical A shaped molding was obtained. The inner peripheral surface of the obtained cylindrical molded product was polished by an NC polishing machine (manufactured by Mizuguchi Seisakusho), and the gloss value at an incident angle of 85 ° on the inner peripheral surface was set to 42.0. Next, the outer peripheral surface of the cylindrical molded product is polished by an NC polishing machine (manufactured by Mizuguchi Seisakusho), and the gloss value at an incident angle of 85 ° on the outer peripheral surface is set to 46.1, and the cylindrical molded product having a thickness of 0.47 mm. Got.

The outer peripheral surface of the cylindrical molded product polished as described above is coated with a coating solution of JLY-601 ESD (manufactured by Nippon Atsson Co., Ltd.) for forming the outermost surface layer by spray coating, and baked at 140 ° C. for 30 minutes. An outermost surface layer was formed to obtain a belt-like conductive member. The thickness of the outermost surface layer at this time was 5.0 μm. The friction coefficient of the outer peripheral surface of the obtained belt-like conductive member measured in the same manner as in Example 1 was 0.28, and the friction coefficient of the inner peripheral surface was 0.30. Further, the hardness of the belt-like conductive member was measured in the same manner as in Example 1. As a result, it was 78. Furthermore, the volume resistivity at 25 ° C. measured in the same manner as in Example 1 was 5.7 × 10 ⁶ Ω · cm.
The belt-like conductive member thus produced was evaluated in the same manner as in Example 1 for the initial image quality after printing 10,000 sheets, the contamination on the surface of the transfer conveyance belt, and the sheet conveyance property. The results are shown in Table 1.

  From Table 1, the friction coefficient of the outer peripheral surface of the belt-shaped conductive member is 0.1 or more and 0.3 or less, and the friction coefficient of the inner peripheral surface of the belt-shaped conductive member is 0.4 or more and 1.0 or less. In Examples 1 to 4, the image quality and the paper transportability are good, and the transfer and transport belt is less contaminated.

It is a schematic sectional drawing which shows the structure of the belt-shaped electroconductive member of this invention. It is a figure for demonstrating the measuring method of the friction coefficient of the outer peripheral surface of the belt-shaped electroconductive member of this invention. It is a figure for demonstrating the measuring method of the friction coefficient of the internal peripheral surface of the belt-shaped electroconductive member of this invention. 1 is a diagram schematically illustrating a main part of an example of an image forming apparatus of the present invention.

Explanation of symbols

2 Elastic layer 4 Outermost surface layer 20 Belt-shaped conductive member 22 Metal plate 24 Friction coefficient measuring machine 26 Metal probe 30 Photoconductor 32 Transfer conveyance belt 34 Drive roll 36 Drive roll 38 Transfer roll 40 Recording paper 42 Charging device 44 Exposure Device 46 Developing device 48 Cleaning member 50 Cleaning blade 52 Holding member

Claims (1)

  A method for producing a belt-like conductive member in which at least an outermost surface layer is formed on an outer peripheral surface of an elastic body layer,
  A cross-linking step of cross-linking the belt-like elastic body layer, and after polishing the inner peripheral surface of the elastic body layer after the cross-linking step, the outer peripheral surface of the elastic body layer is polished and the inner peripheral surface of the elastic body layer is polished again. A method for producing a belt-like conductive member, comprising: a polishing step; and an outermost surface layer forming step of forming an outermost surface layer on the outer peripheral surface of the elastic body layer that has undergone the polishing step.

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