JP4597616B2 - Conductive member and method for producing conductive member - Google Patents

Description

  The present invention relates to a conductive member used for development, charging, transfer, cleaning, static elimination and the like in an image forming apparatus employing an electrophotographic system such as a printer, a facsimile machine, and a copying machine, and a method for manufacturing the same.

  In recent years, OA equipment such as copiers and printers has been improved in image quality, and accordingly, a developer having an elastic layer as a developer carrying member in a development process for visualizing an electrostatic latent image on a photoreceptor with toner. A contact development method is used in which development is performed by using a supporting member and uniformly pressing the photosensitive member. In this contact development method, the developer carrying member has an elastic layer made of an elastic material in order to ensure a uniform pressure contact width to the photoconductor, and a toner image is applied to the photoconductor by applying a voltage. Therefore, uniform conductivity and leak resistance are required.

  Therefore, for example, an elastic layer in which an electronic conductive agent or an ionic conductive agent is dispersed and adjusted to a desired resistance value is formed on a conductive support, and wear resistance, toner charging property, and toner transportability are provided on the outer periphery thereof. In order to obtain the coating layer, a coating layer made of a coating material to which a resin such as nylon or urethane, rough particles for ensuring surface roughness, and a conductive agent for ensuring conductivity is added is often provided. In addition, a resistance adjusting layer (intermediate layer) may be provided between the elastic layer and the coating layer in order to stabilize the resistance of the developer carrying member. In particular, the rough particles added to the coating layer to obtain toner transportability affect the development performance of the developer-carrying member and satisfy toner transportability in all environments such as high temperature and high humidity and low temperature and low humidity. There must be.

  As described above, the developer-carrying member is a coating layer in which a uniform surface roughness is provided by roughening particles after ensuring a uniform pressure contact width to the photoreceptor by an elastic layer made of an elastic material. In this case, a uniform amount of toner is transported. However, if the coating layer of the developer carrying member is defective, the toner transport amount is locally non-uniform and tends to appear as an image defect. In recent years, as the need for higher image quality has increased, there has been an increasing demand for eliminating defects in the coating layer.

  In general, as a method for forming a coating layer, various coating methods such as dip coating, roll coating, spray coating, ring coating, etc. are employed using a coating liquid to which conductive particles or rough particles are added in advance. A film with a thickness of several μm to several tens of μm is formed, but before these are formed, burrs and polishing debris adhering to the surface of the elastic layer and dust adhering to static electricity are not sufficiently removed. Then, a defect occurs in the coating layer, resulting in a defective product as a developer carrying member.

  Conventionally, as methods for removing burrs, polishing debris, dust, etc. adhering to the surface of the elastic layer, blowing of compressed air, contact with an adhesive tape, washing with an organic solvent that does not attack the elastic layer, etc. have been generally used. None of the effects were satisfactory.

  Accordingly, the cleaning liquid containing the abrasive is sprayed together with the compressed air, and the abrasive is rubbed against the dust adhering to the surface of the charging roller made of a soft foam to remove the dust. A cleaning method has been proposed (for example, Patent Document 1).

  However, in this method, since the cleaning liquid containing the abrasive is ejected vigorously from the nozzle of the cleaning gun, the nozzle may be worn. Further, since water containing an abrasive or an aqueous cleaning solution is used, a residue is likely to remain on the roller surface after cleaning, and rinsing cleaning becomes necessary, so that the process is complicated.

  As another conventional technique, while spraying pressure water toward the outer diameter of the rubber roll, the brush is slidably contacted with the outer diameter of the rubber roll to clean the rubber powder and the like adhering to the surface of the rubber roll. It can also prevent clogging. (For example, Patent Document 2)

However, in this method, since the brush is in sliding contact with the rubber roll, depending on the material of the rubber roll, there is a possibility that the outer surface of the rubber roll is damaged. Contamination and clogging of the brush used here is prevented at the same time as cleaning the outer surface of the rubber roll, but the rubber powder and dust contained in the brush are extremely difficult to remove. It is not something that can be taken without spraying. For this reason, the brush itself may be worn by continuous use, and dust may accumulate in the brush, and the rubber roller may be contaminated.
JP 2001-51482 A JP 2001-327932 A

  An object of the present invention has been made in view of the above, and has an appropriate surface roughness that satisfies toner transportability and toner chargeability, and does not generate a development failure due to a coating layer surface defect. And a manufacturing method thereof.

  As a result of intensive studies on the coating layer formation conditions, the present inventors use a coating liquid containing a resin material and insulating fine particles as the coating layer material, and specify the coating method on the elastic layer. As a result, the inventors have found that the above-described problems can be solved, and have further studied the present invention.

  That is, the present invention provides a conductive member having a conductive elastic layer on the outer periphery of a core metal and a covering layer on the outer peripheral surface of the elastic layer, wherein the conductive elastic layer holds the core metal in the center. The elastic layer forming material is injected from the injection port of the elastic layer forming material provided in the piece holding the metal core in the elastic layer forming space in the metal cylindrical mold whose both ends are closed, and is heated and cured. The coating layer provided on the outer peripheral surface of the elastic layer is formed by coating the coating layer coating liquid at least once from the side opposite to the injection side of the elastic layer forming material. It is an electroconductive member characterized by being made.

  The present invention also provides a method for producing a conductive member in which a conductive elastic layer is disposed on the outer periphery of a core metal and a coating layer is formed on the outer peripheral surface of the elastic layer. The elastic layer forming material is injected from the injection port of the elastic layer forming material provided in the piece holding the metal core into the elastic layer forming space in the metal cylindrical mold closed at both ends with the piece held in the piece, and heated and cured. Forming a coating layer coating liquid for forming the coating layer, and coating the coating layer coating on the outer peripheral surface of the elastic layer from the side opposite to the injection side of the elastic layer forming material. A method for producing a conductive member, comprising: a step of coating a working solution at least once to form a coating layer; and a step of drying the coating layer.

  Furthermore, in this invention, it is preferable that the coating liquid for coating layers contains the insulating particle | grains with an average particle diameter of 3-30 micrometers.

  According to the present invention, it is possible to provide a conductive member that can be suitably used in an electrophotographic apparatus, has an appropriate surface roughness that satisfies toner transportability, and does not cause development failure due to a coating layer surface defect. Provided is a method by which the conductive member can be efficiently manufactured.

  Hereinafter, the present invention will be described in detail by taking a roller-shaped developer carrying member as an example of the conductive member. The same concept can be applied to a roller-shaped conductive member that electrically controls an object to be contacted such as a charging member, a transfer member, a cleaning member, and a charge removal member other than the roller-shaped developer carrying member.

  A schematic cross-sectional view of a conductive member targeted by the present invention is shown in FIG. 1A is a longitudinal sectional view with respect to an axis, and FIG. 1B is a sectional view perpendicular to the axis.

  The conductive member of the present invention has a conductive elastic layer 2 on the outer periphery of a metal shaft (core) 1, and a coating layer 3 is formed on the outer peripheral surface thereof.

  The conductive elastic layer 2 is formed on the outer periphery of the cored bar 1 using a molding die as shown in a schematic sectional view in FIG.

  That is, when the core metal 1 is injected with the injection side piece 4 having the injection port 6 for injecting the elastic layer material and the elastic layer material is injected, the air in the elastic layer forming cavity 9 and the elastic layer material supplied excessively are It is gripped by the discharge-side piece 5 having the discharge port 7 that overflows, is stored in the cylindrical mold 8, is set in the injection device, and is then brought to a predetermined temperature, and then is supplied to the elastic layer forming cavity 9 as an elastic layer material. Is injected from the injection port 6 and further heated and cured at a temperature and time for curing the elastic layer raw material, so that the conductive elastic layer 2 is formed on the outer periphery of the cored bar 1. Here, it is possible to use the same shape for the pieces 4 and 5, and by doing so, it is possible to set the injection device without being aware of the direction. The conductive member in which the elastic layer is formed on the cored bar thus manufactured is further processed in two items as necessary, and used for the following coating layer formation.

  At this time, the end of the elastic layer 2 on the injection port 6 side is not injected into the elastic layer forming cavity 9 but remains in the injection line in the injection side piece 4 and is cured as it is. At the time of injection, since the raw material injection pressure is higher on the injection side than on the discharge side, the raw material permeates between the injection side piece 4 and the cylindrical mold 8 and the hardened material is larger than that on the discharge side. . In addition, the injection side piece 4 has various mechanisms formed on the contact surface to the injection path and the elastic layer end for controlling the injection of the raw material, and often has a more complicated shape than the discharge side piece 5 and is also elastic. In many cases, the layer is attached with minute dust formed on the raw material injection side at the time of formation. In addition, although the discharge side of the formed elastic layer originally has less burrs or the like than the injection side, the discharge-side piece 5 can be formed so as to generate less burrs or the like during molding.

  Therefore, in the present invention, when the coating layer is formed on the conductive member before the coating layer is formed in the mold as described above, the side opposite to the material injection side of the conductive elastic layer (that is, the discharge layer) Apply the coating solution for the coating layer from the side). By doing in this way, it becomes possible to prevent the surface abnormality by the adhesion of the dust to a coating layer.

  In the present invention, a round bar made of a metal material such as iron, copper, stainless steel, aluminum and nickel can be used as the core, and the surface may be plated for the purpose of providing rust prevention and scratch resistance. However, it is necessary not to impair the conductivity.

  As raw materials for the elastic layer, rubber materials such as natural rubber, silicone rubber, urethane rubber, chloroprene rubber, neoprene rubber, isoprene rubber, nitrile butadiene rubber (NBR), and conductive agent (carbon black, graphite, conductive Metal oxide, copper, aluminum, nickel, iron powder or the like) or an ionic conductive agent (alkali metal salt and ammonium salt) added, or conductive rubber can be used as appropriate. In this case, two or more conductive agents may be used in combination. The addition amount of the conductive agent is usually 2 to 20 parts by mass with respect to 100 parts by mass of the rubber material. In consideration of hardness and compression set, addition reaction type conductive silicone rubber is preferable.

  When addition reaction type conductive silicone is used, set the mold with the cored bar set in advance in the injection molding apparatus, heat at 80 to 200 ° C. for 1 to 30 minutes, and heat cure Then, the elastic layer is formed, and after the mold is sufficiently cooled, the top is removed and the mold is removed. Thereafter, if necessary, secondary curing treatment is performed to obtain an elastic layer.

  If the developer carrying member is manufactured, the thickness of the elastic layer is usually preferably 1 to 6 mm.

  The developer carrying member has an elastic layer, but this elastic layer can also be a multi-layer. In this case, advantages such as easy adjustment of hardness and resistance of the elastic layer can be obtained. When the outermost layer (layer that forms a coating layer on the outer peripheral surface) of the multilayer elastic layer is formed of addition reaction type conductive silicone rubber, a material that does not hinder the reaction is used for the lower elastic layer. Must be selected. Further, when the elastic layer is a multilayer, at least the outermost layer of the multilayer elastic layer uses a forming mold, and an elastic layer obtained from a process of injecting the raw material from one of the pieces holding the core metal and thermosetting it Need to be. In this case, the lower elastic layer formed on the outer periphery of the cored bar is directly set in the forming mold. Here, the production of the core layer that forms the outermost elastic layer with the lower elastic layer formed is not particularly limited. However, when a molding die is used, all layers are formed by injecting raw materials from the same side. It is also preferable that the core metal is covered with the one extruded in a tube shape. Further, it may be polished if necessary.

  In the present invention, a conductive layer is formed on the outer periphery of the core bar manufactured as described above, and further, components such as softening oil and plasticizer contained in the elastic layer are conductive on the outer peripheral surface. At least one coating layer is provided for the purpose of preventing bleeding out to the surface of the member or for the purpose of adjusting the electric resistance of the entire conductive member.

  When the conductive member is a developer-carrying member, the thickness of the coating layer is usually preferably 8 μm or more in order to prevent bleed-out, and without damaging the flexibility of the elastic layer and wear resistance. Considering the properties, the thickness is preferably 100 μm or less. In addition, when making a coating layer into a multilayer, what is necessary is just to make it the thickness of a coating layer become this range in total.

  The coating layer raw material is preferably a resin material containing insulating particles and conductive fine particles having an average particle size of 3 to 30 μm.

  Examples of resin materials include fluororesin, nylon resin, acrylic resin, polyurethane resin, silicone resin, butyral resin, polyolefin-based thermoplastic elastomer, urethane-based thermoplastic elastomer, polystyrene-based thermoplastic elastomer, fluororubber-based thermoplastic elastomer, polyester Examples thereof include thermoplastic thermoplastic elastomers, polyamide thermoplastic elastomers, polybutadiene thermoplastic elastomers, ethylene vinyl acetate thermoplastic elastomers, polyvinyl chloride thermoplastic elastomers, and chlorinated polyethylene thermoplastic elastomers. These resin materials may be a homopolymer or a copolymer. Moreover, these resin materials can also be used individually or in combination of 2 or more types.

  In the contact development method, the coating layer 3 requires a uniform pressure contact with the photoreceptor in the developer carrying member, and is also in contact with a regulating blade that regulates the toner layer thickness on the developer carrying member. If a deformed trace remains, it will appear as an image defect. For this reason, the developer carrying member is required to have a high compression set against the environmental temperature used in a copying machine, a printer, and the like, and a polyurethane resin is preferable because it can easily meet such a demand.

  Any urethane resin can be used as long as it can be adapted to form the coating layer. That is, as the polyol compound used for the urethane resin, known polyols for polyurethane such as polyethylene glycol, tetramethylene glycol polyethylene diadipate, polyethylene butylene adipate, poly-ε-caprolactone diol, polycarbonate polyol, polypropylene glycol and the like can be used. . The longer the molecular chain of the polyol compound, the more flexible polyurethane coating layer can be produced.

  As the isocyanate compound, diisocyanates such as diphenylmethane diisocyanate (MDI), tolylene diisocyanate (TDI), hexamethylene diisocyanate (HDI), and their burettes, isocyanurates and urethanes are preferably used. be able to. Particularly preferred isocyanate compounds include HDI and its burette-modified product, isocyanurate-modified product, urethane-modified product, and the like.

  In the present invention, it is preferable to use insulating particles having an average particle diameter of 3 to 30 μm. Further, when the average particle diameter of the insulating particles used in the present invention is 3 μm or more, the surface irregularity of the coating layer becomes large, and when the developer carrying member is obtained, sufficient toner transportability is obtained, and the average particle diameter is obtained. When the thickness is 30 μm or less, the average interval between the surface irregularities of the (outermost layer) coating layer becomes an appropriate size, and it becomes easy to set the toner conveyance amount to an appropriate amount, resulting in a good image. Preferably it is 5-15 micrometers.

The average particle diameter Dv of the insulating particles is a volume average particle diameter obtained by the following formula, where n _i is the number of particles having the particle diameter D _i .
Dv = (Σn _i D _i ³ / Σn _i ) ^1/3

  In the present invention, the coefficient of variation of the particle size of the insulating particles is preferably 40% or less. Here, the coefficient of variation means a value obtained by dividing the standard deviation of the particle diameter of the insulating particles by the average particle diameter (volume average particle diameter) and multiplying this by 100. When the coefficient of variation of the insulating particles is 40% or less, the particle size distribution of the insulating particles is narrowed, and the surface roughness of the coating layer of the developer carrying member and the surface irregularities can be easily controlled.

  Examples of the insulating particles include urethane particles, nylon particles, acrylic particles, and silicone particles. The shape is preferably spherical.

  The amount of the insulating particles added is usually 2 to 50 parts by mass when the resin material in the coating layer raw material is 100 parts by mass. When the addition amount of the insulating particles is within this range, a coating layer surface having an appropriate toner transportability as a developer carrying member can be obtained.

  The coating layer raw material in the present invention preferably contains conductive fine particles for the purpose of adjusting the electric resistance of the entire developer-carrying member. The conductive fine particles include fine particles of a conductive agent (carbon black, graphite, conductive metal oxide, copper, aluminum, nickel, iron powder, etc.) having various electron conduction mechanisms or an ionic conductive agent (alkali metal salt and ammonium salt). Can be used. Two or more of these conductive agents may be used in combination. Moreover, it is preferable to add 5-200 mass parts normally with respect to 100 mass parts of resin materials for electroconductive fine particles. When the addition amount of the conductive fine particles is 5 parts by mass or more, the coating layer can impart conductivity, and the conductivity can be controlled by adding the necessary amount of conductive fine particles up to 200 parts by mass. Become. It is more preferable to add 15 to 30 parts by mass. The conductive fine particles used are not suitable for materials that contaminate the photoreceptor.

  Examples of the organic solvent that can be used for forming the coating layer include ketones such as methyl isobutyl ketone, methyl ethyl ketone, acetone and cyclohexanone, aromatics such as xylene and toluene, esters such as n-butyl acetate and ethyl acetate, and tetrahydrofuran. , Ethers such as ethyl cellosolve, tetrahydropyran, and the like, but are not particularly limited thereto. Moreover, when resin etc. melt | dissolve, water etc. can be used as a solvent.

  These materials are added to a solvent, diluted appropriately, a conductive agent is dispersed, and a coating layer coating solution is prepared.

  Conventional methods can be used to clean the surface of the elastic layer before coating, and the coating liquid of the present invention is applied from the side opposite to the injection side (discharge side) of the elastic layer material to form a coating layer. A higher effect can be expected by combining with the forming method.

  Specific methods include, for example, spraying compressed air, contact with an adhesive tape, cleaning with an organic solvent that does not attack the elastic layer material, cleaning with high-pressure water, and cleaning with water.

  The coating method is not particularly limited as long as it is a coating method that selects a method for selectively applying the coating liquid from one direction, such as dip coating, ring coating, roll coating, and the like. In the dip coating, there are two directions of dipping and pulling up, and the one that is first brought into contact with the coating layer coating solution during the dipping is defined as the coating start side.

  In dip coating, the end layer side into which the elastic layer material is injected is faced up, and the elastic layer roller is immersed vertically with respect to the liquid surface, and then pulled up to elasticize the coating layer coating liquid. Apply on the outer peripheral surface of the layer. At the time of immersion, the surface in the longitudinal direction of the elastic layer is immersed in the coating solution so that the upper end (the end opposite to the liquid surface) is not immersed in the coating solution. By doing so, the elastic layer raw material injection side end portion having a large amount of burrs and burr debris is not immersed in the coating solution, so that burrs and the like do not fall into the coating solution. Further, since the burr waste adhering to the end portion of the elastic layer hardly touches the coating liquid, the coating layer does not have the burr waste adhering thereto.

  In ring coating, roll coating, and the like, the coating layer coating solution is continuously applied on the outer circumference of the elastic layer from the side opposite to the side where the elastic layer raw material is injected. By doing so, since the coating ends at the injection side end portion where there are many burrs and burrs, burrs and burrs are not included in the coating layer, and defects of the coating layer do not occur. Also, when the next elastic layer is applied, the head part of the ring coating machine or roll coating machine (the part where the coating liquid is applied in the vicinity of or in contact with the elastic layer) is contaminated with burrs and debris. In this case, a head cleaning mechanism or the like may be provided.

  When a pulverization step is added in the production of the coating liquid, a ball mill, a sand mill, a vibration mill or the like is used.

  Next, the film produced by the coating method as described above is dried. As a drying method, air drying without heating, heat drying, in the case of a thermosetting resin, heat treatment up to the reaction temperature, etc. It can be selected depending on the material used.

  According to the present invention, when there is a difference in the conductivity of the conductive layer between the injection side and the discharge side, the resistance between the surface of the conductive member and the metal core can be made uniform by controlling the thickness of the coating layer when forming the coating layer. can do.

  Examples of the conductive member include a conductive member that electrically controls an object to be contacted, such as a charging member, a transfer member, a cleaning member, and a charge removal member, other than the roller-shaped developer carrying member.

  Hereinafter, the present invention will be described in more detail with reference to examples. In addition, this invention is not limited at all by these Examples.

Example 1
A φ8mm stainless steel core is held by a piece from both sides so as to be concentric with the elastic layer cavity in a cylindrical mold with an inner diameter of 16mm. The molding die is assembled, set in an injection device, and the die is set to 115 ° C. Then, the liquid rubber was injected under injection conditions (injection time 10 seconds, amount of liquid rubber injected into the mold 40 ml, constant speed of 4 ml / second).

The liquid rubber used here is a liquid conductive silicone rubber (manufactured by Toray Dow Corning Co., Ltd., volume specific resistance 1 × 10 ⁶ Ωcm product), and a platinum catalyst is blended in one liquid and a curing agent is blended in the other liquid. A two-component addition reaction type was used.

  The mold into which the liquid rubber has been injected is heated and cured at 110 ° C. for 6 minutes on a heating plate in the molding apparatus, demolded, and then subjected to secondary vulcanization in an oven at 200 ° C. for 4 hours to obtain a thickness on the core metal. A developer carrying member precursor having a 4 mm elastic layer was obtained.

  Next, urethane paint (Nipporan N5033; trade name, manufactured by Nippon Polyurethane Co., Ltd.) is diluted with methyl ethyl ketone so that the solid content concentration becomes 10%, and carbon black (MA100; trade name, manufactured by Mitsubishi Chemical Corporation) is used as a conductive agent. 70 parts by mass with respect to 100 parts by mass of the solid content of the urethane paint, and urethane particles (Art Pearl C400; trade name, manufactured by Negami Kogyo Co., Ltd.) having an average particle size of 14 μm as insulating particles are added to 100 parts by mass of the solid content of the urethane paint. After adding 10 parts by mass, 10 parts by mass of a curing agent (Coronate L; trade name, manufactured by Nippon Polyurethane Co., Ltd.) is added to 100 parts by mass of the solid content of the urethane paint, and the mixture is stirred and applied. A working solution was prepared. Next, this coating liquid was put into a circulation machine of a vertical dip coating apparatus, and the coating liquid was conditioned and circulated for about 1 hour. A part of the coating liquid is extracted from the circulating machine, and the rotor No. No. 1 rotor was set, and the viscosity was measured at a liquid temperature of 23 ± 1 ° C. and a rotor rotation speed of 60 rpm. The liquid viscosity at this time was 14.0 mPa · s.

  The developer carrying member precursor obtained by the above method is held on the coating pallet with the liquid rubber injection side up, that is, the discharge side down, and the liquid penetration speed is 10 mm / sec. A vertical dip coating was performed for 10 seconds at an average pulling rate of 200 mm / second, dried in an oven at 80 ° C. for 15 minutes, cured in an oven at 140 ° C. for 4 hours, a coating layer was formed, and the developer carrying member was Obtained.

Example 2
In Example 1, urethane particles (Art Pearl C800; trade name, manufactured by Negami Kogyo Co., Ltd.) having an average particle diameter of 6 μm were used as insulating particles to be added at the time of forming the coating layer. Example 1 except that the fine powder component and coarse powder component were removed with an iron mining company elbow jet classifier) and urethane particles obtained by classification with an average particle size of 3 μm were used, and the addition amount was increased to 30 parts by weight. In the same manner, a developer carrying member was produced.

Example 3
In Example 1, urethane particles (Art Pearl C300; trade name, manufactured by Negami Kogyo Co., Ltd.) having an average particle diameter of 21 μm are used as insulating particles added at the time of forming the coating layer. Elbow jet classifier) removes ultrafine powder and fine powder components, uses classified urethane particles with an average particle size of 30 μm, and reduces the amount added to 3 parts by weight. did.

Comparative Example 1
In Example 1, a developer carrying member was prepared in the same manner as in Example 1 except that the developer carrying member precursor liquid rubber injected side (injection side) was held on the coating pallet.

Comparative Example 2
A developer carrying member was produced in the same manner as in Example 2, except that the developer carrying member precursor liquid rubber injected side (injection side) was held on the coating pallet.

Comparative Example 3
In Example 3, a developer carrying member was produced in the same manner as in Example 3 except that the developer carrying member precursor liquid rubber injected side (injection side) was held on the coating pallet.

  The surface of the developer-carrying member obtained in the above Examples and Comparative Examples was visually observed, and the number of occurrences of 100 convex defects formed by burr dust adhering to the coating layer surface was examined. The results are shown in Table 1.

  As is apparent from Table 1, in Examples 1 to 3 in which the coating layer was applied from the opposite side (discharge side) of the elastic layer raw material injection side to the elastic layer forming mold, the raw material having a large amount of burrs and burr debris Since the end on the injection side is not immersed in the coating layer coating liquid, the coating layer coating liquid is not contaminated with the burr scraps, and the burr scraps adhering to the elastic layer are also hardly coated. No burr scraps adhered to the coating layer. That is, no defective defective defects occurred with 100 coatings. If the average particle diameter of the rough particles is in the range of 3 to 30 μm, the developer carrying member can be obtained without being particularly affected by the number of convex defects due to the burr.

  On the other hand, Comparative Examples 1 to 3 had the side on which the elastic layer material was injected facing down, so that the developer carrying member precursor was immersed in the coating liquid, and thus became a coating layer with a large amount of debris adhesion. . The coating solution was also contaminated with debris.

It is a schematic sectional drawing ((a) longitudinal direction, (b) metal core perpendicular | vertical) of a developer holding member. It is the schematic of the metal mold | die for elastic layer formation.

Explanation of symbols

1 cored bar 2 elastic layer 3 coating layer 4 pieces (injection side)
5 pieces (discharge side)
6 Inlet 7 Outlet 8 Cylindrical mold 9 Elastic layer forming cavity

Claims (4)

In the conductive member having a conductive elastic layer on the outer periphery of the core metal and having a coating layer on the outer peripheral surface of the elastic layer,
An elastic layer forming material from an injection port provided in a piece for holding a core metal in an elastic layer forming space in a metal cylindrical mold in which a conductive elastic layer is closed at both ends by a piece holding the core in the center Is injected and cured by heating,
The coating layer provided on the outer peripheral surface of the elastic layer is formed by coating the coating layer coating solution at least once from the side opposite to the injection side of the elastic layer forming material. Conductive member.   The conductive member according to claim 1, wherein the coating layer coating liquid contains insulating particles having an average particle diameter of 3 to 30 μm. In the method for producing a conductive member in which a conductive elastic layer is disposed on the outer periphery of the core metal and a coating layer is formed on the outer peripheral surface of the elastic layer,
The conductive elastic layer is elastic from the injection port of the elastic layer forming material provided in the piece for holding the core metal in the elastic layer forming space in the metal cylindrical mold whose both ends are closed by the piece holding the core metal in the center. A step of injecting a layer-forming material and heat-curing it,
A step of preparing a coating layer coating solution for forming the coating layer;
Forming a coating layer on the outer periphery of the elastic layer by coating the coating solution for the coating layer at least once from the side opposite to the injection side of the elastic layer forming material; and drying the coating layer The manufacturing method of the electroconductive member characterized by comprising.   The method for producing a conductive member according to claim 3, wherein the coating layer coating liquid contains insulating particles having an average particle diameter of 3 to 30 μm.

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