JP2006021391A - Conductive roller and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a conductive roller capable of extending the life of a coating solution by prescribing the SP values of respective materials of a resin layer, the coating solution and a masking member and not having irregularity of physical properties such as resistance irregularity or the like, and its manufacturing method. <P>SOLUTION: In the conductive roller wherein at least one elastic layer is formed on the outer periphery of a metal shaft body and a resin layer is provided on the outer periphery of the elastic layer by coating the elastic layer with the coating solution, the relation between the SP value (SP1) of the resin material contained in the resin layer and the SP value (SP2) of the coating solution becomes ¾SP1-SP2¾<2.5 (formula 1). <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a conductive roller disposed in contact with a photosensitive drum in an image forming apparatus such as an electrophotographic copying apparatus, a printer, and an electrostatic recording apparatus, and a manufacturing method thereof. In particular, the present invention relates to a developing roller that is required to reduce variation in electrical characteristics in order to visualize an electrostatic latent image on a photosensitive drum, and a manufacturing method thereof.

  2. Description of the Related Art Conventionally, in an electrophotographic recording apparatus, an image forming unit is installed inside a main body, and an image is formed through cleaning, charging, latent image, development, transfer, and fixing processes. The image forming unit includes a photosensitive drum that is an electrophotographic photosensitive member, and includes a cleaning unit, a charging unit, a latent image forming unit, a developing unit, and a transfer unit. The image on the photosensitive drum formed by the image forming unit is transferred to a recording material by the transfer unit, conveyed, and then heated and pressed by a fixing unit (not shown), and discharged as a fixed recorded image. Is done.

  Next, among the cleaning, charging, latent image, development, transfer, and fixing processes, the charging, latent image formation, development, and transfer processes will be described with reference to FIG.

  In the charging unit, the charging member 4 performs a primary charging process on the surface of the photosensitive drum 2 so that the potential is uniform with a predetermined polarity. After being uniformly charged by the charging unit, the image is subjected to exposure I of target image information, whereby an electrostatic latent image corresponding to the target image is formed on the surface of the photosensitive drum 2. The electrostatic latent image is visualized as a toner image by the developing member 1 in the developing unit. The visualized toner image is transferred to the recording material P by applying a voltage from the back surface of the recording material by the transfer member 3 at the transfer portion. Thereafter, the recording material is conveyed to a fixing unit (not shown), subjected to image fixing, and output as a recorded image.

  As a means for executing a developing process in an image forming apparatus such as an electrophotographic apparatus, a developing action is performed by applying a voltage. In the developing system shown above, the developing member 1 is a developing roller having an electric resistance value of a semiconductive region and is always in pressure contact with the photosensitive drum, the developing blade, the toner supply roller, etc. It is an indispensable condition for obtaining a good image to be made of a material with little variation in electrical characteristics.

  In general, a roller-shaped conductive elastic roller has been widely used as a member used in the charging, transferring, and developing processes. Further, since each roller is in contact with or pressed against another member such as toner or a photosensitive drum, a further surface function is required depending on the member, such as surface releasability. In order to satisfy these functions, it is necessary to form a resin layer on the surface of the elastic layer, and as a means for forming the resin layer, spray coating, dipping method, roll coater, etc. are used. Dipping is preferably used.

  When the resin layer is formed by the above method, it is necessary to form the resin layer only on the necessary portion of the elastic layer, and it is necessary to mask the portion on which the resin layer is not formed.

  Regarding the conductive masking masking member, the resin layer formed at the lower end of the elastic roller is swelled by coating using a masking member having a diameter larger than the outer diameter of the elastic roller on which the resin layer is formed. Is described (for example, Patent Document 1).

  In addition, it is described that by forming a resin component having an SP value (solubility parameter) of 6 to 12.5 on the outer peripheral surface of the elastic semiconductive layer, the wear resistance and concentration unevenness of the roll are reduced. (For example, Patent Document 2).

  However, in the above document, the material of the masking member used for coating is not specified, and the physical properties such as coating stability (mass productivity) and resistance unevenness of the conductive roller produced by the above method are also included. Not mentioned. Therefore, when coating is performed on the elastic roller surface using the masking member of the above method, the components of the masking member ooze out into the coating solution, and when coating is performed for a long time, the coating solution is contaminated. The life of the coating solution may be shortened. As a result, the conductive roller produced by the above method may cause variations in physical properties in the roller such as uneven resistance.

JP 2001-179144 A JP 2001-132731 A

  Accordingly, an object of the present invention is to form an elastic layer by forming a metal shaft body and at least one elastic layer on the outer periphery of the shaft body, and further applying a coating liquid to the elastic layer. A conductive roller provided with a resin layer on the outer periphery thereof, or a metal shaft core, and at least one elastic layer is formed on the outer periphery of the shaft core, and the coating liquid is applied to the elastic layer. In the conductive roller produced by coating using a masking member when coating, it is possible to extend the coating solution life by defining the SP value of each material of the resin layer, coating solution and masking member. It is to be. Another object of the present invention is to obtain a conductive roller having no physical property variation such as uneven resistance.

  The present inventor has studied in order to solve the above problems, and forms a metal shaft body and at least one elastic layer on the outer periphery of the shaft body, and further applies the coating liquid to the elastic layer. In a conductive roller in which a resin layer is provided on the outer periphery of the elastic layer by coating, the relationship between SP1 of the resin layer and SP2 of the coating liquid is | SP1-SP2 | <2.5. The conductive roller manufactured by the method for manufacturing a conductive roller was found to have little variation in electrical resistance value, and further investigations were made to complete the present invention.

  Further, a metal shaft body and at least one elastic layer are formed on the outer periphery of the shaft body, and further, coating is performed using masking when the coating liquid is applied to the elastic layer. In the conductive roller manufactured in the above, it is preferable that the relation between SP3 of the material of the masking member and SP2 of the coating liquid is 0.2 <| SP2-SP3 |.

  Further, in the present invention, the resin layer preferably has a thickness of 1 to 100 μm.

  The conductive roller is preferably used for a developing roller, a transfer roller, and a charging roller.

  The conductive roller manufactured by the above manufacturing method is a resin roller formed of a resin layer using a coating liquid in which the difference in SP value between the resin layer and the coating liquid is 2.5 or less. Since the solubility in the coating solution is good, there is little variation in electrical resistance. Moreover, since the masking material does not ooze into the coating liquid, the conductive roller manufactured using the masking member has a longer life of the coating liquid and is excellent in mass productivity. Therefore, when image output evaluation is performed using the conductive roller manufactured by the above manufacturing method, high-quality image quality can be provided.

  That is, in an image forming apparatus such as an electrophotographic copying apparatus, a printer, and an electrostatic recording apparatus, the present invention has a small variation in electric resistance value of the conductive roller and is excellent in mass productivity. In particular, when a conductive roller is used as the developing roller, the variation in the partial electric resistance value in the circumferential direction in the developing roller is reduced, and the toner charged with a stable chargeability and a uniform charge is added to the developing roller. Can be sent to the photosensitive drum, and since it has good development characteristics in the initial stage of use of the developing roller, a high-quality image without density unevenness can be obtained. Furthermore, it is possible to provide an electrophotographic process cartridge and an electrophotographic image forming apparatus having a developing roller capable of obtaining a high-quality image over a long period of time and performing stable development.

  The developing roller 1, which is one of the conductive rollers according to the present invention, has an elastic layer 1b around a shaft body 1a and a resin layer 1c arranged on the outer periphery thereof. The resin layer 1c does not have to be a single layer, and may be a multilayer.

  The shaft body material used here may be any material as long as it is electrically conductive, and can be appropriately selected from carbon steel, alloy steel, cast iron, conductive resin, and the like. Here, examples of the alloy steel include stainless steel, nickel chrome steel, nickel chrome molybdenum steel, chrome steel, chromium molybdenum steel, nitriding steel to which Al, Cr, Mo and V are added. Therefore, a metal one is desirable. Furthermore, the shaft body material can be plated and oxidized as a rust prevention measure. As the type of plating, any of electroplating, electroless plating, etc. can be used, but electroless plating is preferred from the viewpoint of dimensional stability. Examples of the electroless plating used here include nickel plating, copper plating, gold plating, Kanigen plating, and various alloy platings. Examples of the nickel plating include Ni-P, Ni-B, Ni-WP, Ni-P-PTFE composite plating, and the like. Each film thickness is preferably 0.05 μm or more, but more preferably in consideration of work efficiency and price, each film thickness is preferably 0.1 to 30 μm.

  Materials that can be used for the elastic layer used here are ethylene propylene rubber (EPDM), isoprene rubber (IR), styrene rubber (SBR), butadiene rubber (BR), nitrile rubber (NBR), butyl rubber (IIR). , Silicone rubber (Q), chloroprene rubber (CR), chlorosulfonated polyethylene (CSM), acrylic rubber (ACM), hydrin rubber (ECO), polysulfide rubber (T) and the like. It can also be used. Further, these materials can be used after imparting conductivity.

  As a means for making these elastic layers conductive, there is a method of making them conductive by adding a conductivity-imparting agent based on an electronic conduction mechanism to the above materials. Examples of the conductivity imparting agent based on the electronic conduction mechanism include carbon-based materials such as carbon black and graphite, metals or alloys such as aluminum, silver, gold, tin-lead alloy, copper-nickel alloy, zinc oxide, titanium oxide, and aluminum oxide. Examples thereof include metal oxides such as tin oxide, antimony oxide, indium oxide, and silver oxide, and materials obtained by applying various types of fillers to conductive metal plating such as copper, nickel, and silver. These conductivity-imparting agents based on the electronic conduction mechanism can be used alone or in admixture of two or more in the form of powder or fiber. Among these, carbon black is used at a high ratio from the viewpoint of easy control of conductivity and economy.

  Examples of the means for forming the elastic layer include the following.

  That is, any of extrusion, injection molding, casting, and the like can be used, and can be appropriately selected according to the characteristics of the material (liquid, solid, viscosity, etc.). Further, in order to improve the dimensional accuracy (outer diameter, runout, cylindricity, etc.), the surface of the elastic layer can be further machined by polishing or the like.

In addition to the materials used for the elastic layer raised above, materials used for the resin layer disposed outside the elastic layer include urethane resin, epoxy resin, diallyl phthalate resin, polyethylene resin, and polycarbonate resin. Fluorine resin, polypropylene resin, urea resin, melamine resin, silicon resin, polyester resin, styrene resin, acrylic resin, vinyl acetate resin, phenol resin, polyamide resin, fiber resin, vinyl chloride resin, silicone resin, aqueous resin, etc. These can be used in combination of two or more. Among these, it is particularly desirable to use a nitrogen-containing compound, such as a urethane resin or an acrylic resin, from the viewpoint of stabilizing the charge in the toner. Further, these materials can be used after imparting conductivity. As a method for imparting conductivity, it is possible to use a method similar to the above-described method for making the elastic layer conductive. It is also possible to form a resin layer by coating these materials. Moreover, the resin layer does not need to be a single layer and may be two or more layers.
When the material constituting the resin layer is made into a paint, the material and the conductive agent are dispersed using a conventionally known dispersing device using beads such as a sand mill, a paint shaker, a dyno mill, a pearl mill, or the like. The obtained paint for forming the resin layer is applied to the surface of the elastic layer by a spray coating method, a dipping method, a roll coater method or the like. In the present invention, since it is preferable that the surface of the developing roller is uniformly rough, dipping is mainly used.

  The thickness of the resin layer is preferably 1 to 100 μm. If the thickness is too small, low molecular weight components in the resin layer may ooze out and contaminate the photosensitive drum, and if it is too thick, the developing roller becomes hard and causes toner fusing.

  Here, it is possible to use the following as a kind of solvent used in order to paint the material which comprises the said resin layer.

  That is, pentane, hexane, diethyl ether, cyclohexane, butyl acetate, xylene, toluene, benzene, methyl ethyl ketone, methanol and the like can be mentioned. The solvent used here may be any one as long as the difference in SP value between the resin layer and the constituent material is 2.5 or less, and if the difference in SP value is 2.5 or less, two or more types may be used. Combinations are also possible. Here, when the difference in SP value between the SP value (SP2) of the coated coating liquid and the material constituting the resin layer is 2.5 or more, it is difficult and difficult for the resin material to dissolve well in the coating liquid. .

  Further, as the material of the masking member used when the resin layer is formed by coating the elastic roller with the coating liquid, the SP value (SP3) of the material of the masking member and the SP value (SP2) of the coating liquid are used. It is desirable that the difference between the two is 0.2 or more. When this difference is 0.2 or more, it is possible to prevent the masking member from oozing out into the coating solution and to extend the life of the coating solution. In this case, since the component of the masking member does not ooze out into the coating solution, as a result, it is possible to prevent the masking member component from being mixed into the surface resin layer. There is an effect that does not ooze out.

  On the other hand, when this difference is less than 0.2, when a large number of elastic layer rollers are applied, the masking member material is mixed into the coating liquid and the resin layer, and unnecessary components such as masking material are mixed into the resin layer. As a result, the completed conductive roller has problems such as partial resistance unevenness and poor appearance. In addition, as a material of the masking member used here, the difference of SP value with a resin layer material should just be 0.2 or more, and the same material as what was enumerated as a material used for the said resin layer Can be used.

  Here, SP1 is the SP value of the base resin material constituting the resin layer (only the base resin material not containing conductive fillers, additives, etc.), and SP2 is the solvent contained in the coating liquid. SP value, SP3 refers to the SP value of the masking material. The SP values of the base material (SP1) and the masking material (SP3) constituting the resin layer are measured as follows.

  That is, when there is a solvent that dissolves the material, it is estimated from the SP value of the solvent that dissolves the material. In the absence of a solvent that dissolves the material, the swelling method or the intrinsic viscosity method is used. The swelling method is a method of estimating from the SP value of the solvent that maximizes the degree of swelling. The intrinsic viscosity method is a method for obtaining from the intrinsic viscosity of the resin, and the intrinsic viscosity of the resin in the solvent shows a maximum value when the SP value of the resin and the SP value of the solvent coincide. That is, the resin is dissolved in solvents having various SP values, the intrinsic viscosity is measured, and the SP value of the resin is estimated from the SP value of the solvent that gives the maximum intrinsic viscosity. When the base material, solvent, and masking material that make up the resin layer are composed of a plurality of materials and a plurality of solvents, the total of the respective SP values multiplied by the weight fraction is used as the base material, the solvent, and the masking material. The SP value of the material is used.

  The resistance value of the conductive roller produced here was measured as shown in FIG.

  That is, the conductive roller is pressed against the metal drum 6 with a load of 500 g applied to both ends of the shaft body, the roller is rotated at 60 rpm, and a voltage of 100 V is applied to the metal drum 6 and the shaft body 1a of the developing roller. Then, the resistance value flowing through the conductive roller was measured to calculate the resistance value. Here, the conductive roller manufactured using the coating liquid and masking material specified in the above range can be obtained in a mass production because the conductive roller with a small variation in electrical resistance value is obtained and at the same time the life of the coating liquid is extended. Excellent in properties. In particular, when the conductive roller is used as a developing roller, the unevenness of partial electric resistance in the circumferential direction in the roller is small, so that the toner conveyance force is stable and toner with a uniform charge is added to the developing roller. From the toner to the photosensitive drum, the toner transportability is stable, and good image quality can be obtained.

Hereinafter, the present invention will be described with reference to examples. First, a method for evaluating the performance of the developing roller will be described.
(1) Image evaluation An electrophotographic laser printer (manufactured by Canon Inc., LBP-1310) was used, and the image was evaluated by incorporating the product produced in this example as a developing roller. The electrophotographic laser printer is a machine for A4 vertical output, and has a recording medium output speed of 18 ppm and an image resolution of 1200 dpi. The contact pressure of the developing roller with the photosensitive drum and the approach amount were adjusted so that the toner coating amount on the developing roller was 0.20 mg / cm ² . Further, a toner supply roller made of a soft urethane sponge that scrapes old toner from the developing roller and supplies new toner to the developing roller is provided. Image development of the developing roller is carried out by incorporating the developing roller into an electrophotographic apparatus and continuously 10000 images continuously drawing a horizontal line with a width of 2 dots and an interval of 50 dots in the direction perpendicular to the rotation direction of the photosensitive drum. An image in which a horizontal line having a width of 1 dot and an interval of 2 dots was drawn in the direction perpendicular to the rotation direction of the photosensitive drum was output.
(2) Thickness of resin layer Measure the outer diameter of the elastic layer roller before coating and the outer diameter of the developing roller after coating measured with a laser length measuring machine (Roncom 65A, manufactured by Tokyo Seimitsu Co., Ltd.). The film thickness is half of the thickness.
(3) Developing roller resistance value As shown in FIG. 3, a load of 500 g is applied to both ends of the shaft 1a of the developing roller and pressed against the metal drum 6, and rotated at a rotation speed of the roller of 60 rpm. After applying a voltage of 100 V to the shaft 1a of the developing roller, the value of the current flowing through the developing roller is measured. Next, the ratio between the maximum value and the minimum value of the circumferential resistance value of the roller is defined as unevenness in the circumferential direction, and this is defined as uneven resistance.
(4) Image evaluation and resistance variation Image evaluation and resistance variation were judged according to the following criteria.

Image evaluation:
◎: Image density is sufficiently dark and appropriate and excellent image quality ○: Image density is dark and appropriate and image quality is good △: Image density is faint but there is no problem in practical use ×: Image density is low Resistance variation :
A: Resistance does not vary among individual developing rollers, and a roller having no functional problem can be provided without checking the roller resistance.

    ○: Although the resistance of each developing roller varies somewhat, it is possible to provide a roller having no functional problem by checking and checking the roller resistance. Further, regarding the obtained roller, there is very little partial resistance unevenness in the roller and there is no practical problem.

    Δ: There is a variation in resistance among individual developing rollers, and a roller that does not produce a good image is generated. However, a roller having no functional problem can be provided by performing a roller resistance inspection and selecting. Further, the selected roller has no problem in practical use although there is partial resistance unevenness in the roller.

    X: Resistance variation of individual developing rollers is large, and a large number of rollers from which good images cannot be obtained are generated. Rollers that have no functional problems can be provided by screening through roller resistance inspection, but the yield rate is poor and mass productivity is poor.

  In addition, regarding image evaluation and resistance variation, a roller having a resin layer formed with a new coating liquid is used, and after liquid endurance, a roller having a resin layer formed with a coating liquid after 50,000 coatings have been performed. The resistance variation was evaluated.

  Next, specific examples of implementation will be described below.

(1) Manufacture of elastic layer roller In EPDM rubber, carbon black (Mitsubishi Chemical Corporation: Mitsubishi Conductive Carbon Black # 3030) as an electrically conductive filler is 10% by mass, paraffin oil as a plasticizer, and other vulcanizing agents. Then, a vulcanization accelerator, an anti-aging agent and the like were added while kneading, and extrusion molding was performed with an extruder to obtain a tubular molded product. This molded product was vulcanized with a vulcanizer at 140 ° C. for 30 minutes to obtain a tube shape (inner diameter 5.8 mm, outer diameter 17 mm). This tube shape is press-fitted and bonded to a shaft body 6 mm in diameter and 260 mm in length with an adhesive applied in advance, the surface is polished with a cylindrical polishing machine, and the rubber end is cut off, so that the total length of the rubber is 240 mm and the outer diameter is An elastic layer roller having a thickness of 16 mm and no fluff on the roller surface was obtained. The shaft body is made of iron, and a 2 μm film is produced by electroless nickel plating after washing.
(2) Production of developing roller Urethane in which carbon black (manufactured by Mitsubishi Chemical Corporation: Dia Black A SAF) as a conductive filler is dispersed on the surface of the elastic layer roller obtained as described above in an amount of 30% by dry weight. The coating liquid (SP1 = 10.0) (the solvent is methyl ethyl ketone as the main solvent, SP2 = 9.3, liquid viscosity 18 m · pa · s) is dipped on the elastic layer roller prepared above, and then pulled up and dried. A developing roller having a resin layer provided on the outer periphery of the elastic layer was manufactured by heat treatment at 145 ° C. for 2 hours. When dipping the elastic layer roller, a masking cap (material is polyethylene resin, SP3 = 8.0) is applied to the core of the lower layer of the elastic layer roller, and the coating liquid is applied to other than the necessary part. I tried not to be.

The film thickness of the surface resin layer of the developing roller was 18 μm at the maximum and 14 μm at the minimum, and the roller had a substantially uniform thickness. In particular, good results were obtained for the film thickness of the image region portion (width 210 mm).
(3) Evaluation of developing roller As a result of incorporating this developing roller into an electrophotographic laser printer and making pressure contact with the amount of entry into the photosensitive drum being 30 μm, and using this developing roller to evaluate the image by halftone, A good image was obtained. Specifically, a high-quality image without density unevenness was achieved. At the same time, the resistance of each developing roller does not vary, and a roller having no functional problem can be provided without checking the roller resistance. Further, regarding the obtained roller, partial resistance unevenness is extremely high in the roller. There were few problems in practical use. These evaluation results are shown in Table 1.

(1) Manufacture of elastic layer roller 100 parts by mass of polydimethylsiloxane having vinyl ends and 10 parts by mass of carbon black (# 3030) and 100 parts by mass of polydimethylsiloxane having silicon-bonded hydrogen atoms are mixed until they are uniformly dispersed by a roll. The mixed material was poured into a pipe-shaped mold in which a shaft body (similar to that used in Example 1) that had been kneaded and coated with an adhesive was set. Thereafter, the mold is held at 120 ° C. for 30 minutes at 200 kg / cm ² while being sandwiched by a hot platen, and after cooling, the pipe mold is removed, and a hot air drying furnace is used at 200 ° C. for 4 hours. An elastic layer roller was obtained by secondary curing.
(2) Production of developing roller Next, a urethane resin raw material (solid content 5%, SP1 = 10.0) was dissolved in a mixed solution (SP2 = 9.6) using methyl ethyl ketone and acetone 1: 1 as a solvent. The coating liquid (liquid viscosity 20 m ·) was prepared by adding 15 parts by mass of carbon black (ASAF) and 10 parts by mass of urethane particles having a number average particle size of 3 μm to 100 parts by mass of the resin raw material, and sufficiently stirring and dispersing them. pa · s), an elastic layer roller is immersed and coated, and then pulled up, dried, and heat-treated at 160 ° C. for 2 hours to provide a conductive resin layer on the outer periphery of the elastic layer. Got. When dipping the elastic layer roller, a masking member (material is polyethylene resin, SP3 = 8.0) is applied to the core metal below the elastic layer roller, and the coating liquid is not applied except for the necessary part. I did it.

The film thickness of the developing roller surface resin layer was 18 μm at the maximum and 15 μm at the minimum, and the roller had a uniform thickness. In particular, the film thickness of the image region portion (width 210 mm) was good.
(3) Evaluation of developing roller As a result of incorporating this developing roller into an electrophotographic laser printer and making pressure contact with the amount of entry into the photosensitive drum being 30 μm, and using this developing roller to evaluate the image by halftone, A good image was obtained. Specifically, a high-quality image without density unevenness was achieved. At the same time, the resistance of each developing roller does not vary, and a roller having no functional problem can be provided without checking the roller resistance. Further, regarding the obtained roller, partial resistance unevenness is extremely high in the roller. There were few problems in practical use. These evaluation results are shown in Table 1.

  In Example 2, the developing roller was used in the same manner as in Example 2 except that the solvent used for the coating liquid was only methyl ethyl ketone (SP2 = 9.3) and the masking material was vinyl chloride resin (SP3 = 9.3). The performance of the produced developing roller was evaluated. The evaluation results are shown in Table 1.

  In Example 2, the developing roller was used in the same manner as in Example 2 except that the solvent used for the coating solution was only dimethylformamide (SP2 = 12.0) and the masking material was epoxy resin (SP3 = 10.9). The performance of the produced developing roller was evaluated. The evaluation results are shown in Table 1.

<Comparative Example 1>
In Example 2, a developing roller was prepared in the same manner as in Example 2 except that the solvent used for the coating solution was methanol (SP2 = 14.5) only and the masking material was epoxy resin (SP3 = 10.9). Then, the performance of the obtained developing roller was evaluated. The evaluation results are shown in Table 1.

<Comparative example 2>
In Example 2, the developing roller was used in the same manner as in Example 2 except that the solvent used in the coating solution was only ethylene glycol (SP2 = 14.6) and the masking material was polyethylene resin (SP3 = 8.0). The performance of the produced developing roller was evaluated. The evaluation results are shown in Table 1.

It is the side surface (A) and sectional drawing (B) of the developing roller which show embodiment of this invention. 1 is a schematic diagram of an image forming apparatus. It is the schematic of the apparatus which measures the resistance value of an electroconductive roller.

Explanation of symbols

1 Developing member (Developing roller)
2 Electrophotographic photoreceptor (photosensitive drum)
DESCRIPTION OF SYMBOLS 3 Transfer member 4 Charging member 5 Cleaning means 6 Metal drum 1a Core metal (shaft body)
1b Elastic layer 1c Resin layer E1 Power supply for bias application (for charging member application)
E2 Power supply for bias application (For transfer member application)
E3 Power supply for bias application (for developing roller application)
I Exposure system P Recording material

Claims (5)

A metal shaft body and at least one elastic layer are formed on the outer periphery of the shaft body, and a resin layer is provided on the outer periphery of the elastic layer by applying a coating liquid to the elastic layer. In the conductive roller, the relationship between the SP value (SP1) of the resin material contained in the resin layer and the SP value (SP2) of the coating liquid is expressed by the following equation (1) | SP1-SP2 | <2.5
A method for producing a conductive roller, wherein Forming a metal shaft body and at least one elastic layer on the outer periphery of the shaft body, and further applying the coating liquid on the elastic layer using a masking member In the conductive roller manufactured by the following process, the relationship between the SP value (SP3) of the material of the masking member and SP2 of the coating liquid is expressed by the following equation (2): 0.2 <| SP2-SP3 |
A method for producing a conductive roller, wherein   A conductive roller manufactured by the manufacturing method according to claim 1.   The conductive roller according to claim 3, wherein a film thickness T of the resin layer according to claim 1 is 1 = <T = <100 μm.   The conductive roller according to claim 3, wherein the conductive roller is a developing roller, a transfer roller, or a charging roller.

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