Conductive Roll for Electrophotographic Apparatus

Abstract

Provided is a conductive roll for an electrophotographic apparatus in which image defects due to core metal corrosion and bleed-out of an ionic conductive agent are suppressed. 【Solution means】The conductive roll 10 for an electrophotographic apparatus includes at least a metallic shaft body 12, an elastic body layer 14 disposed outside the outer peripheral surface of the shaft body 12, and a surface layer 16 disposed outside the outer peripheral surface of the elastic body layer 14. The elastic body layer 14 contains a polymer containing a halogen atom and an ionic conductive agent composed of any one or two or more of sulfonium salts, ammonium salts, and phosphonium salts, and a compound having an epoxy group and an ester group is included in a range from the outside of the outer peripheral surface of the shaft body 12 to inside the elastic body layer 14.

Description

Technical Field

[0001] The present invention relates to a conductive roll for electrophotographic equipment, which is preferably used in electrophotographic equipment such as copiers, printers, and facsimiles that employ the electrophotographic method.

Background Art

[0002] Inside electrophotographic equipment such as copiers, printers, and facsimiles that employ the electrophotographic method, a photosensitive drum is usually incorporated, and around it, roll-shaped conductive members such as a charging roll, a developing roll, a transfer roll, and a toner supply roll, a dirt removal member such as a cleaning blade, and belt-shaped conductive members such as a transfer belt and a fixing belt are arranged. Copying and printing by this type of electrophotographic equipment are performed by forming an original image as an electrostatic latent image on the photosensitive drum, attaching toner to the electrostatic latent image to form a toner image, and transferring the toner image to a copy paper.

[0003] The conductive roll for electrophotographic equipment is known to have a configuration including a shaft body composed of a core metal or the like, an elastic body layer formed on the outer peripheral surface of the shaft body, and a surface layer formed on the outer peripheral surface of the elastic body layer. The conductive roll is molded by die molding, Assy molding, or the like. In die molding, the rubber of the elastic body layer is brought into close contact with the core metal by utilizing the shrinkage during vulcanization of the rubber. In Assy molding, a hollow rubber with an inner diameter smaller than the core metal diameter is extruded and assembled in a subsequent process. The conductive roll may also be adhered using an adhesive for the purpose of ensuring the adhesion between the core metal and the rubber of the elastic body layer. For the elastic body layer of the conductive roll, hydrin rubber may be used as a rubber material for the purpose of reducing the resistance. Also, an ionic conductive agent may be used as a conductive agent.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] When hydrin rubber is used for the elastic layer of the conductive roll, chlorine atoms may be released from the hydrin rubber and react with moisture in the rubber to generate hydrochloric acid. When the generated hydrochloric acid reaches the pinholes on the mandrel, the mandrel corrodes. When the mandrel corrodes, the roll shape may change or the resistance may change, which may cause image defects. In addition, the ionic conductive agent has the function of lowering the pH in the rubber. When an ionic conductive agent is used together with hydrin rubber for the elastic layer of the conductive roll, it lowers the pH in the rubber and facilitates the progress of mandrel corrosion by hydrochloric acid. In addition, the ionic conductive agent is likely to bleed out due to polarization when energized. As a result, an increase in resistance may occur, which may cause image defects.

[0006] The problem to be solved by the present invention is to provide a conductive roll for an electrophotographic apparatus in which image defects due to mandrel corrosion and bleeding out of the ionic conductive agent are suppressed.

Means for Solving the Problems

[0007] The conductive roll for an electrophotographic apparatus according to the present invention includes at least a metal shaft body and an elastic layer disposed outside the outer peripheral surface of the shaft body. The elastic layer includes a polymer containing a halogen atom and an ionic conductive agent composed of any one or two or more of sulfonium salts, ammonium salts, and phosphonium salts, and contains a compound having an epoxy group and an ester group in the range from the outside of the outer peripheral surface of the shaft body to the inside of the elastic layer.

[0008] The shaft body and the elastic body layer are adhered via an adhesive layer, and it is preferable that one or both of the elastic body layer and the adhesive layer contain a compound having an epoxy group and an ester group. In this case, it is preferable that the adhesive layer contain a compound having an epoxy group and an ester group. Alternatively, the elastic body layer may contain a compound having an epoxy group and an ester group. And the polymer containing a halogen atom is preferably hydrin rubber. When the adhesive layer contains a compound having an epoxy group and an ester group, the content of the compound having an epoxy group and an ester group is preferably 0.004 parts by mass or more and 15 parts by mass or less with respect to 100 parts by mass of the binder of the adhesive layer. When the elastic body layer contains a compound having an epoxy group and an ester group, the content of the compound having an epoxy group and an ester group is preferably 0.004 parts by mass or more and 15 parts by mass or less with respect to 100 parts by mass of the polymer containing a halogen atom in the elastic body layer. The content of the ionic conductive agent is preferably 0.2 parts by mass or more and 6.5 parts by mass or less with respect to 100 parts by mass of the polymer containing a halogen atom. The weight average molecular weight Mw of the compound having an epoxy group and an ester group is preferably 5,000 or more and 150,000 or less. The compound having an epoxy group and an ester group preferably has an aromatic ring.

[0009] In the conductive roll for electrophotographic apparatus according to the present invention, the shaft body and the elastic body layer may be directly adhered, and the elastic body layer may contain a compound having an epoxy group and an ester group.

[0010] (1) The conductive roll for electrophotographic apparatus according to the present invention includes at least a metal shaft body and an elastic body layer disposed outside the outer peripheral surface of the shaft body. The elastic body layer contains a polymer containing a halogen atom and an ionic conductive agent composed of any one or two or more of a sulfonium salt, an ammonium salt, and a phosphonium salt, and contains a compound having an epoxy group and an ester group in the range from the outside of the outer peripheral surface of the shaft body to inside the elastic body layer.

[0011] (2) In the above (1), the shaft body and the elastic body layer are adhered via an adhesive layer, and it is preferable that one or both of the elastic body layer and the adhesive layer contain a compound having an epoxy group and an ester group.

[0012] (3) In the above (1) or the above (2), the polymer containing a halogen atom is preferably hydrin rubber.

[0013] (4) In the above (2), it is preferable that the adhesive layer contains a compound having an epoxy group and an ester group.

[0014] (5) In the above (2), it is preferable that the elastic body layer contains a compound having an epoxy group and an ester group.

[0015] (6) In the above (4), the content of the compound having an epoxy group and an ester group is preferably 0.004 parts by mass or more and 15 parts by mass or less with respect to 100 parts by mass of the binder of the adhesive layer.

[0016] (7) In the above (5), the content of the compound having an epoxy group and an ester group is preferably 0.004 parts by mass or more and 15 parts by mass or less with respect to 100 parts by mass of the polymer containing a halogen atom in the elastic body layer.

[0017] (8) In any one of the above (1) to the above (7), the content of the ionic conductive agent is preferably 0.2 parts by mass or more and 6.5 parts by mass or less with respect to 100 parts by mass of the polymer containing a halogen atom.

[0018] (9) In any one of the above (1) to the above (8), the weight average molecular weight Mw of the compound having an epoxy group and an ester group is preferably 5,000 or more and 150,000 or less.

[0019] (10) In any one of the above (1) to the above (9), the compound having an epoxy group and an ester group preferably has an aromatic ring.

[0020] (11) In the above (1), the shaft body and the elastic body layer are directly adhered, and the elastic body layer may be configured to contain a compound having an epoxy group and an ester group. [Advantages of the Invention]

[0021] The conductive roll for electrophotographic equipment according to the present invention includes at least a metal shaft body and an elastic body layer disposed outside the outer peripheral surface of the shaft body. When the elastic body layer contains a polymer containing a halogen atom and an ionic conductive agent composed of any one or more of sulfonium salts, ammonium salts, and phosphonium salts, a compound having an epoxy group and an ester group is included in the range from the outside of the outer peripheral surface of the shaft body to inside the elastic body layer. Since the compound having an epoxy group and an ester group captures the acid caused by the halogen atom, it is possible to prevent the acid from reaching the metal shaft body. Further, since the compound having an epoxy group and an ester group immobilizes the ionic conductive agent, a decrease in pH due to the ionic conductive agent is suppressed, and the progress of core metal corrosion due to the acid is suppressed. Thereby, core metal corrosion is suppressed and image defects are suppressed. Furthermore, since the compound having an epoxy group and an ester group immobilizes the ionic conductive agent, bleeding out of the ionic conductive agent is suppressed, and image defects due to this are suppressed.

[0022] And the shaft body and the elastic body layer are adhered via an adhesive layer, and a configuration in which one or both of the elastic body layer and the adhesive layer contain a compound having an epoxy group and an ester group, the shaft body and the elastic body layer are directly adhered, and the elastic body layer contains a compound having an epoxy group and an ester group. In any of these configurations, as described above, image defects due to core metal corrosion and bleeding out of the ionic conductive agent are suppressed.

[0023] When the polymer containing a halogen atom is epichlorohydrin rubber, a chlorine atom is released from the epichlorohydrin rubber and core metal corrosion is likely to occur. Even in this case, core metal corrosion is suppressed and image defects due to core metal corrosion are suppressed.

[0024] By including a compound having an epoxy group and an ester group in the adhesive layer, acids caused by halogen atoms can be effectively captured. In addition, an ionic conductive agent can be effectively immobilized. By including a compound having an epoxy group and an ester group in the elastic layer, acids caused by halogen atoms can be effectively captured. In addition, an ionic conductive agent can be effectively immobilized.

[0025] When the adhesive layer contains a compound having an epoxy group and an ester group, if the content of the compound having an epoxy group and an ester group is 0.004 parts by mass or more and 15 parts by mass or less with respect to 100 parts by mass of the binder of the adhesive layer, the effect of capturing acids caused by halogen atoms and the effect of immobilizing the ionic conductive agent are excellent, and an increase in resistance due to the compound is easily suppressed.

[0026] When the elastic layer contains a compound having an epoxy group and an ester group, if the content of the compound having an epoxy group and an ester group is 0.004 parts by mass or more and 15 parts by mass or less with respect to 100 parts by mass of the halogen atom-containing polymer of the elastic layer, the effect of capturing acids caused by halogen atoms and the effect of immobilizing the ionic conductive agent are excellent, and an increase in resistance due to the compound is easily suppressed.

[0027] When the content of the ionic conductive agent is 0.2 parts by mass or more and 6.5 parts by mass or less with respect to 100 parts by mass of the halogen atom-containing polymer, the effect of reducing resistance is excellent, and bleeding out of the ionic conductive agent is easily suppressed.

[0028] When the weight average molecular weight Mw of the compound having an epoxy group and an ester group is 5,000 or more and 150,000 or less, a decrease in the effect of immobilizing the ionic conductive agent due to a shortage of the ester group is easily suppressed, and an increase in resistance due to the compound is easily suppressed.

[0029] When the compound having an epoxy group and an ester group has an aromatic ring, it is easy to suppress a decrease in the immobilization effect of the ionic conductive agent.

Brief Description of Drawings

[0030]

Figure 1

Figure 2

Embodiments for Carrying Out the Invention

[0031] The conductive roll for an electrophotographic apparatus according to the present invention (hereinafter, may be simply referred to as a conductive roll) will be described in detail. FIG. 1 is an external view schematic diagram (a) of a conductive roll for an electrophotographic apparatus according to an embodiment of the present invention and a cross-sectional view taken along line A-A thereof (b). The conductive roll includes at least a metal shaft body and an elastic body layer disposed outside the outer peripheral surface of the shaft body.

[0032] The conductive roll 10 includes a shaft body 12, an adhesive layer 18 formed on the outer peripheral surface of the shaft body 12, an elastic body layer 14 formed on the outer peripheral surface of the adhesive layer 18, and a surface layer 16 formed on the outer peripheral surface of the elastic body layer 14. The elastic body layer 14 is a layer (base layer) that serves as the base of the conductive roll 10. The surface layer 16 is a layer that appears on the surface of the conductive roll 10. The adhesive layer 18 is disposed between the shaft body 12 and the elastic body layer 14 and is in contact with both. The adhesive layer 18 functions as a layer that adheres between the shaft body 12 and the elastic body layer 14. The shaft body 12 and the elastic body layer 14 are adhered via the adhesive layer 18.

[0033] The shaft body 12 only needs to generally have conductivity, and the material is not limited in this regard. However, in the present invention, it is made of a metal material. The shaft body 12 may be composed of only a base material made of a metal material, or may have a structure having one or more metal layers formed on the surface of the base material by plating or the like. In this case, the metal layer is formed from the viewpoints of enhancing rust prevention and enhancing adhesion to the adhesive layer 18. From the viewpoint of cost, it is preferable that the shaft body 12 is composed of only the base material. However, from the viewpoints of excellent rust prevention and excellent adhesion to the adhesive layer 18, etc., the shaft body 12 preferably has a structure having one or more metal layers on the surface of the base material.

[0034] Examples of the metal of the base material include iron and stainless steel. From the cost aspect, iron is preferable as the metal of the base material. The metal layer formed on the surface of the base material is made of a metal having conductivity. Examples of such a metal of the metal layer include nickel. The metal layer formed on the surface of the base material is preferably formed by plating from the viewpoints of workability, adhesion, etc. There are electroless plating and electroplating for plating. From the viewpoints of excellent uniformity of film thickness and few defects such as pinholes, electroless plating is preferable.

[0035] The thickness of the metal layer formed on the surface of the base material is preferably relatively thick (specifically, 10 μm or more) from the viewpoints of excellent rust prevention and excellent adhesion to the adhesive layer 18, etc. However, since the cost increases accordingly, from the viewpoint of cost, it is preferably 3 μm or less.

[0036] The shape of the shaft body 12 is not particularly limited as long as it can form a shaft body. It may be a round bar shape made of a solid body, or may be a cylindrical shape with a hollow inside.

[0037] The adhesive layer 18 is composed of an adhesive composition containing an adhesive component (binder component). Examples of the adhesive component include phenolic resin adhesives, epoxy resin adhesives, nitrile rubber adhesives, acrylic resin adhesives, polyurethane adhesives, styrene-butadiene adhesives, and natural rubber adhesives. As the adhesive component, only one of these may be used, or two or more of them may be used in combination.

[0038] From the viewpoint of being able to cure by heat, pressure, etc. during vulcanization of the elastomeric layer 14 and function as the adhesive layer 18, the adhesive component of the adhesive composition is preferably a vulcanizing adhesive. Examples of the vulcanizing adhesive include phenolic resin adhesives, epoxy resin adhesives, and nitrile rubber adhesives from the above-mentioned adhesive components. Only one of these may be used, or two or more of them may be used in combination.

[0039] The adhesive composition can include a conductive agent (electronic conductive agent, ionic conductive agent) for imparting conductivity, if necessary. In addition, one or more additives such as a vulcanizing agent (crosslinking agent), vulcanization accelerator, vulcanization aid (crosslinking aid), extender, reinforcing agent, processing aid, antioxidant, plasticizer, ultraviolet absorber, and lubricant can be included.

[0040] In consideration of coatability, the viscosity of the adhesive composition can be adjusted using a solvent. Examples of the solvent include methyl ethyl ketone (MEK) and methyl isobutyl ketone (MIBK).

[0041] The thickness of the adhesive layer 18 is not particularly limited and can be set, for example, to be 1 μm or more and 100 μm or less. The thickness of the adhesive layer 18 is more preferably 3 μm or more and 50 μm or less, and even more preferably 5 μm or more and 10 μm or less. The volume resistivity of the adhesive layer 18 is not particularly limited, but from the viewpoint of excellent conductivity, etc., it is preferably in the range of 1.0×10 2 ~5.0×10 5 Ω·cm.

[0042] The elastic layer 14 is made of a conductive rubber composition containing a polymer containing a halogen atom and an ionic conductive agent.

[0043] The polymer containing a halogen atom is included as the main component of the rubber component of the conductive rubber composition. The main component means 50% by mass or more. More preferably, it is 70% by mass or more, 90% by mass or more. Examples of the polymer containing a halogen atom include hydrin rubber, chloroprene rubber, chlorinated butyl rubber, chlorosulfonated polyethylene rubber, etc. Among these, hydrin rubber is more preferable from the viewpoint of low resistance, etc.

[0044] Examples of hydrin rubber include homopolymer of epichlorohydrin (CO), epichlorohydrin-ethylene oxide binary copolymer (ECO), epichlorohydrin-allyl glycidyl ether binary copolymer (GCO), epichlorohydrin-ethylene oxide-allyl glycidyl ether terpolymer (GECO), etc.

[0045] The ionic conductive agent is composed of any one or two or more of sulfonium salts, ammonium salts and phosphonium salts. Among these, sulfonium salts and ammonium salts are more preferable from the viewpoint of thermal stability, etc.

[0046] Examples of the cations of sulfonium salts, ammonium salts and phosphonium salts include those having one or two or more alkyl groups or aryl groups (such as methyl group, ethyl group, propyl group, butyl group, hexyl group, octyl group, decyl group, phenyl group, xylyl group, etc.) with about 1 to 18 carbon atoms. The alkyl group or aryl group of the cations of sulfonium salts, ammonium salts and phosphonium salts preferably has 1 to 10 carbon atoms. Examples of the anions of sulfonium salts, ammonium salts and phosphonium salts include halogen ions such as F - , Cl - , Br - , I - and the like, ClO4 - , BF4 - , PF6 - , SO42- 、HSO4 - 、C2H5SO4 - 、CF3COO - 、CF3SO3 - 、(CF3SO2)2N - 、(CF3CF2SO2)2N - 、CF3(CF2)3SO3 - 、(CF3SO2)3C - 、CF3(CF2)2COO - Examples thereof include etc. As the anions of sulfonium salts, ammonium salts, and phosphonium salts, ClO4 - 、PF6 - 、(CF3SO2)2N - 、CF3SO3 - etc. are more preferable.

[0047] From the viewpoint of excellent low-resistance effect, etc., the content of the ionic conductive agent is preferably 0.2 parts by mass or more with respect to 100 parts by mass of the polymer containing a halogen atom. More preferably, it is 0.5 parts by mass or more, and still more preferably 1.0 parts by mass or more. And from the viewpoint of being easily suppressed from bleeding out of the ionic conductive agent, etc., it is preferably 6.5 parts by mass or less with respect to 100 parts by mass of the polymer containing a halogen atom. More preferably, it is 6.0 parts by mass or less, and still more preferably 5.0 parts by mass or less.

[0048] In the conductive rubber composition, in addition to the rubber component, a conductive agent (electron conductive agent) for enhancing conductivity can be included. Further, in addition to the rubber component, one or more additives such as a vulcanizing agent (crosslinking agent), a vulcanization accelerator, a vulcanization aid (crosslinking aid), an extender, a reinforcing agent, a processing aid, an antioxidant, a plasticizer, an ultraviolet absorber, and a lubricant can be included.

[0049] Examples of the electron conductive agent include carbon black, graphite, potassium titanate, iron oxide, conductive titanium oxide, conductive zinc oxide, conductive tin oxide, etc. Examples of the vulcanizing agent (crosslinking agent) include sulfur, peroxide, hydrosilyl crosslinking agent, etc. Examples of the vulcanization aid (crosslinking aid) include zinc oxide, magnesium oxide, hydrotalcite, etc.

[0050] The thickness of the elastic body layer 14 is not particularly limited, but is usually formed to be about 0.1 to 10 mm, preferably 1 to 5 mm. From the viewpoint of excellent conductivity, etc., the elastic body layer 14 has a volume resistivity of 1.0×10 5 ~5.0×10 8 Ω·cm is preferably within the range. The elastic body layer 14 may be a solid non-foam or a foam such as a sponge.

[0051] Here, in the conductive roll 10, it is important that a compound having an epoxy group and an ester group is contained in the range from the outer periphery of the shaft body 12 to the inside of the elastic body layer 14 (that is, one or both of the elastic body layer 14 and the adhesive layer 18).

[0052] The elastic body layer 14 contains a polymer containing a halogen atom such as hydrin rubber. Halogen atoms may be released from the polymer containing halogen atoms and react with moisture in the rubber to generate an acid caused by halogen atoms such as hydrochloric acid. The acid caused by halogen atoms is a factor in corroding the metal shaft body 12. Since the epoxy group of the above compound reacts with the acid caused by halogen atoms and captures the acid caused by halogen atoms, it is possible to prevent the acid caused by halogen atoms from reaching the metal shaft body 12.

[0053] Further, from the viewpoint of low resistance, the elastic body layer 14 contains an ion conductive agent together with the polymer containing a halogen atom. The ion conductive agent lowers the pH in the rubber and facilitates the progress of the corrosion of the metal shaft body 12 by the acid caused by halogen atoms. Also, the ion conductive agent is likely to bleed out due to polarization when energized. The epoxy group of the above compound can bind to the cation of the ion conductive agent and immobilize (capture) the ion conductive agent. Also, the ester group of the above compound can electrostatically adsorb the cation and anion of the ion conductive agent by the strong dipole moment of the ester group and immobilize (capture) the ion conductive agent. Thereby, the bleed-out of the ion conductive agent can be suppressed.

[0054] From the perspective of excellent effects such as capturing acids caused by halogen atoms, in the conductive roll 10, it is more preferable that the compound having an epoxy group and an ester group is contained in the adhesive layer 18 or in both the adhesive layer 18 and the elastic body layer 14. On the other hand, from the perspective of excellent effects such as excellent effects of immobilizing (capturing) the ionic conductive agent, in the conductive roll 10, it is more preferable that the compound having an epoxy group and an ester group is contained in the elastic body layer 14 or in both the adhesive layer 18 and the elastic body layer 14.

[0055] When the adhesive layer 18 contains a compound having an epoxy group and an ester group, the content of the compound having an epoxy group and an ester group is preferably 0.004 parts by mass or more with respect to 100 parts by mass of the binder of the adhesive layer 18 from the perspectives of excellent acid capture effect caused by halogen atoms and excellent effect of immobilizing (capturing) the ionic conductive agent at the interface between the elastic body layer 14 and the adhesive layer 18. More preferably, it is 0.01 parts by mass or more, and still more preferably 0.1 parts by mass or more. And from the perspective that the increase in resistance caused by the compound is easily suppressed, it is preferably 15 parts by mass or less with respect to 100 parts by mass of the binder of the adhesive layer 18. More preferably, it is 10 parts by mass or less, and still more preferably 5 parts by mass or less.

[0056] When the elastic body layer 14 contains a compound having an epoxy group and an ester group, the content of the compound having an epoxy group and an ester group is preferably 0.004 parts by mass or more with respect to 100 parts by mass of the halogen atom-containing polymer of the elastic body layer 14 from the perspectives of excellent acid capture effect caused by halogen atoms and excellent effect of immobilizing (capturing) the ionic conductive agent. More preferably, it is 0.01 parts by mass or more, and still more preferably 0.1 parts by mass or more. And from the perspective that the increase in resistance caused by the compound is easily suppressed, it is preferably 15 parts by mass or less with respect to 100 parts by mass of the halogen atom-containing polymer of the elastic body layer 14. More preferably, it is 10 parts by mass or less, and still more preferably 5 parts by mass or less.

[0057] A compound having an epoxy group and an ester group preferably has a weight average molecular weight Mw of 5,000 or more from the viewpoint that the decrease in the immobilization effect of the ionic conductive agent due to the shortage of the ester group is easily suppressed. More preferably, it is 7,000 or more, and still more preferably 9,000 or more. On the other hand, from the viewpoint that the increase in resistance due to the compound is easily suppressed, the weight average molecular weight Mw is preferably 150,000 or less. More preferably, it is 100,000 or less, and still more preferably 50,000 or less.

[0058] The compound having an epoxy group and an ester group preferably has an aromatic ring. When the compound having an epoxy group and an ester group has an aromatic ring, it is effective in suppressing bleed-out using steric hindrance, and the decrease in the immobilization effect of the ionic conductive agent is easily suppressed.

[0059] The material of the surface layer 16 is not particularly limited, and examples thereof include polyamide (nylon)-based, acrylic-based, urethane-based, silicone-based, and fluorine-based polymers. These polymers may be modified. Examples of the modifying group include an N-methoxymethyl group, a silicone group, and a fluorine group.

[0060] In the surface layer 16, a conductive agent such as carbon black, graphite, conductive titanium oxide, conductive zinc oxide, conductive tin oxide, and ionic conductive agent (ammonium salt, phosphonium salt, borate, surfactant, etc.) can be appropriately added for imparting conductivity. Further, various additives such as a crosslinking agent, a leveling agent, and a surface modifier of the polymer component may be appropriately added as necessary. Further, in the surface layer 16, particles for forming roughness may or may not be added to ensure surface roughness.

[0061] The thickness of the surface layer 16 is not particularly limited, but is preferably in the range of 0.01 to 100 μm, more preferably in the range of 0.1 to 20 μm, and still more preferably in the range of 0.3 to 10 μm. The volume resistivity of the surface layer 16 is preferably 10 7 ~1012 Ω·cm, more preferably, 10 8 ~10 11 Ω·cm, still more preferably, 10 9 ~10 10 within the range of Ω·cm.

[0062] The conductive roll 10 can be manufactured by forming an adhesive layer 18 on the outer peripheral surface of the shaft body 12, forming an elastic body layer 14 on the outer peripheral surface of the adhesive layer 18, and forming a surface layer 16 on the outer peripheral surface of the elastic body layer 14.

[0063] The adhesive layer 18 can be formed by applying the above adhesive composition on the outer peripheral surface of the shaft body 12 and then performing a predetermined heat treatment. The heating temperature in the heat treatment is preferably 150 to 250°C. Also, the heating time is preferably 30 to 60 minutes.

[0064] The elastic body layer 14 can be formed by molding the above conductive rubber composition in a layer. The molding of the conductive rubber composition can be performed by extrusion molding or molding. The conductive rubber composition is crosslinked and cured by heating during extrusion molding or molding.

[0065] The surface layer 16 can be formed by coating a surface layer forming composition on the outer peripheral surface of the elastic body layer 14 and then performing a heat treatment as necessary. The surface layer forming composition may appropriately contain solvents such as organic solvents such as methyl ethyl ketone (MEK), toluene, acetone, ethyl acetate, butyl acetate, methyl isobutyl ketone (MIBK), THF, DMF, and water-soluble solvents such as methanol and ethanol. As the coating method, various coating methods such as roll coating method, dipping method, and spray coating method can be applied.

[0066] The conductive roll 10 configured as described above includes a metallic shaft body 12, an adhesive layer 18 formed on the outer peripheral surface of the shaft body 12, and an elastic body layer 14 formed on the outer peripheral surface of the adhesive layer 18. The elastic body layer 14 contains a polymer containing a halogen atom and an ion conductive agent composed of any one or two or more of a sulfonium salt, an ammonium salt, and a phosphonium salt. In this case, one or both of the elastic body layer 14 and the adhesive layer 18, that is, in the range from the outer side of the outer peripheral surface of the shaft body 12 to the inside of the elastic body layer 14, contain a compound having an epoxy group and an ester group.

[0067] Since the compound having an epoxy group and an ester group in the elastic body layer 14 or the adhesive layer 18 captures the acid resulting from the halogen atom of the polymer containing a halogen atom in the elastic body layer 14, it is possible to prevent the acid from reaching the metallic shaft body 12. Further, since the compound having an epoxy group and an ester group in the elastic body layer 14 or the adhesive layer 18 immobilizes the ion conductive agent in the elastic body layer 14, a decrease in pH due to the ion conductive agent is suppressed, and the progress of corrosion of the metallic shaft body 12 by the acid is suppressed. Thereby, corrosion of the metallic shaft body 12 is suppressed, and image defects are suppressed. Furthermore, since the compound having an epoxy group and an ester group in the elastic body layer 14 or the adhesive layer 18 immobilizes the ion conductive agent in the elastic body layer 14, bleed-out of the ion conductive agent is suppressed, and image defects due to this are suppressed.

[0068] The above conductive roll 10 includes the shaft body 12, the adhesive layer 18, the elastic body layer 14, and the surface layer 16 in this order, but the conductive roll for an electrophotographic apparatus according to the present invention is not limited to this configuration. For example, a configuration without the adhesive layer 18 may be employed.

[0069] FIG. 2 is an external schematic view (a) of a conductive roll for an electrophotographic apparatus according to another embodiment of the present invention and a cross-sectional view taken along line B-B thereof (b). The conductive roll includes at least a metallic shaft body and an elastic body layer disposed outside the outer peripheral surface of the shaft body.

[0070] The conductive roll 20 includes a shaft body 12, an elastic body layer 14 formed on the outer peripheral surface of the shaft body 12, and a surface layer 16 formed on the outer peripheral surface of the elastic body layer 14. The conductive roll 20 includes the shaft body 12, the elastic body layer 14, and the surface layer 16 in this order. In the conductive roll 20, the elastic body layer 14 is in contact with both the shaft body 12 and the surface layer 16. Since the conductive roll 20 differs only in the presence or absence of the adhesive layer 18 compared with the conductive roll 10 and is the same as the conductive roll 10 in other respects, the description of the overlapping parts will be omitted.

[0071] In the conductive roll 20, it is important that a compound having an epoxy group and an ester group is included in the range from the outside of the outer peripheral surface of the shaft body 12 to the inside of the elastic body layer 14 (that is, the elastic body layer 14). The compound having an epoxy group and an ester group is as described above.

[0072] The conductive roll 20 having the above configuration includes a metal shaft body 12 and an elastic body layer 14 formed on the outer peripheral surface of the shaft body 12. The elastic body layer 14 includes a polymer containing a halogen atom and an ion conductive agent composed of any one or two or more of a sulfonium salt, an ammonium salt, and a phosphonium salt. In this case, the elastic body layer 14, that is, the range from the outside of the outer peripheral surface of the shaft body 12 to the inside of the elastic body layer 14, includes a compound having an epoxy group and an ester group.

[0073] Since the compound having an epoxy group and an ester group in the elastic body layer 14 captures the acid caused by the halogen atom of the polymer containing a halogen atom in the elastic body layer 14, it is possible to prevent the acid from reaching the metal shaft body 12. Further, since the compound having an epoxy group and an ester group in the elastic body layer 14 immobilizes the ion conductive agent in the elastic body layer 14, a decrease in pH due to the ion conductive agent is suppressed, and the progress of corrosion of the metal shaft body 12 by the acid is suppressed. Thereby, corrosion of the metal shaft body 12 is suppressed and image defects are suppressed. Furthermore, since the compound having an epoxy group and an ester group in the elastic body layer 14 immobilizes the ion conductive agent in the elastic body layer 14, bleed-out of the ion conductive agent is suppressed, and image defects due to this are suppressed.

[0074] And, the conductive rolls 10 and 20 are provided with a surface layer 16 on the outer periphery of the elastic body layer 14 for reasons such as protecting the surface and imparting electrical characteristics and the like. However, the conductive roll for an electrophotographic apparatus according to the present invention is not limited to this configuration. For example, in the conductive rolls 10 and 20, a configuration without the surface layer 16 may be used. Instead of the surface layer 16, the surface of the elastic body layer 14 may be subjected to a surface modification treatment. Examples of the surface modification method include a method of irradiating with UV or an electron beam, and a method of bringing into contact with a surface modifier capable of reacting with an unsaturated bond or a halogen of the elastic body layer 14, for example, a compound containing a reactive functional group such as an isocyanate group, a hydrosilyl group, an amino group, a halogen group, or a thiol group.

[0075] The conductive roll according to the present invention can be used as a conductive roll such as a charging roll, a developing roll, a transfer roll, or a toner supply roll in electrophotographic apparatuses such as copiers, printers, and facsimiles.

Example

[0076] Hereinafter, the present invention will be described in detail using examples and comparative examples.

[0077] (Example 1) <Preparation of Adhesive Composition> An adhesive composition was obtained by blending 15 parts by mass of Compound <1> with respect to 100 parts by mass of a phenolic resin-based adhesive (「Metalock UB」 manufactured by Toyo Chemical Research Institute) as a binder.

[0078] <Preparation of Conductive Rubber Composition> 100 parts by mass of epichlorohydrin rubber (ECO) [“Hydrin T3106” manufactured by Zeon Corporation, Japan], 0.5 parts by mass of sulfur [manufactured by Tsurumi Chemical Industry Co., Ltd.] as a vulcanizing agent, 5.0 parts by mass of two types of zinc oxide [manufactured by Mitsui Mining & Smelting Co., Ltd.] and 10.0 parts by mass of hydrotalcite [manufactured by Kyowa Chemical Industry Co., Ltd., trade name “DHT4A”] as vulcanization aids, 1.0 part by mass of vulcanization accelerator A [manufactured by Sanshin Chemical Industry Co., Ltd., trade name “Santeller CZ”], 1.0 part by mass of vulcanization accelerator B [manufactured by Ouchi Shinko Chemical Industry Co., Ltd., trade name “Accel TBT”], and 3.0 parts by mass of ionic conductive agent <1> were kneaded with a kneader to obtain a conductive rubber composition.

[0079] <Preparation of Surface Layer Forming Composition> 100 parts by mass of N-methoxymethylated nylon (“EF30T” manufactured by Nagase ChemteX), 60 parts by mass of conductive tin oxide (“S-2000” manufactured by Mitsubishi Materials), 1 part by mass of citric acid, and 300 parts by mass of methanol were mixed to prepare a surface layer forming composition.

[0080] <Fabrication of Conductive Roll> After applying the above adhesive composition to the outer periphery of an iron core bar (φ6 mm) plated with nickel and drying it, the core bar coated with the adhesive composition was set inside a pipe-shaped molding die, and the above conductive rubber composition was injected into the die. Then, it was heated at 180 °C for 30 minutes to vulcanize and cure the adhesive composition and the conductive rubber composition. The thickness of the adhesive layer was adjusted to 10 μm, and the thickness of the elastomer layer was adjusted to 3 mm. Next, the surface layer forming composition was roll-coated on the surface of the elastomer layer and heated at 120 °C for 50 minutes to form a surface layer with a thickness of 10 μm on the outer periphery of the elastomer layer. Thereby, a conductive roll was fabricated.

[0081] (Examples 2 to 4) A conductive roll was fabricated in the same manner as in Example 1, except that the blending amount of compound <1> was changed in the preparation of the adhesive composition.

[0082] (Examples 5 to 8) A conductive roll was fabricated in the same manner as in Example 1, except that the type and blending amount of the compound were changed in the preparation of the adhesive composition.

[0083] (Example 9) In the preparation of the adhesive composition, the compounding amount of Compound <1> was changed. In the preparation of the conductive rubber composition, the rubber type was changed from hydrin rubber to chloroprene rubber, and the conductive roll was produced in the same manner as in Example 1 except that the compounding amount of the ionic conductive agent <1> was changed. · Chloroprene rubber ["Showprene GW" manufactured by Showa Denko KK]

[0084] (Examples 10 - 11) In the preparation of the adhesive composition, the compounding amount of Compound <1> was changed. In the preparation of the conductive rubber composition, the conductive roll was produced in the same manner as in Example 1 except that the type of the ionic conductive agent was changed.

[0085] (Examples 12 - 15) In the preparation of the adhesive composition, the compounding amount of Compound <1> was changed. In the preparation of the conductive rubber composition, the conductive roll was produced in the same manner as in Example 1 except that the compounding amount of the ionic conductive agent <1> was changed.

[0086] (Example 21) (Preparation of Adhesive Composition) A phenolic resin - based adhesive ("Metalock UB" manufactured by Toyo Chemical Research Institute) was used as the adhesive composition.

[0087] (Preparation of Conductive Rubber Composition) 100 parts by mass of epichlorohydrin rubber (ECO) ["Hydrin T3106" manufactured by Nippon Zeon Co., Ltd.], 0.5 part by mass of sulfur [manufactured by Tsurumi Chemical Industry Co., Ltd.] as a vulcanizing agent, 5.0 parts by mass of two types of zinc oxide [manufactured by Mitsui Mining & Smelting Co., Ltd.] and 10.0 parts by mass of hydrotalcite [manufactured by Kyowa Chemical Industry Co., Ltd., trade name "DHT4A"] as vulcanization aids, 1.0 part by mass of vulcanization accelerator A [manufactured by Sanshin Chemical Industry Co., Ltd., trade name "Santeller CZ"], 1.0 part by mass of vulcanization accelerator B [manufactured by Ouchi Shinko Chemical Industry Co., Ltd., trade name "Accel TBT"], 3.0 parts by mass of ionic conductive agent <1>, and 15 parts by mass of Compound <1> were kneaded in a kneader to obtain a conductive rubber composition.

[0088] <Preparation of Composition for Forming Surface Layer> 100 parts by mass of N-methoxymethylated nylon (“EF30T” manufactured by Nagase ChemteX), 60 parts by mass of conductive tin oxide (“S-2000” manufactured by Mitsubishi Materials), 1 part by mass of citric acid, and 300 parts by mass of methanol were mixed to prepare a composition for forming a surface layer.

[0089] <Fabrication of Conductive Roll> After applying the above adhesive composition to the outer periphery of an iron core bar (φ6 mm) plated with nickel and drying it, the core bar coated with the adhesive composition was set in a die of a pipe-shaped molding die, and the above conductive rubber composition was injected into the die. Then, it was heated at 180°C for 30 minutes to vulcanize and cure the adhesive composition and the conductive rubber composition. The thickness of the adhesive layer was adjusted to 10 μm, and the thickness of the elastomer layer was adjusted to 3 mm. Next, the composition for forming a surface layer was roll-coated on the surface of the elastomer layer and heated at 120°C for 50 minutes to form a surface layer with a thickness of 10 μm on the outer periphery of the elastomer layer. Thus, a conductive roll was fabricated.

[0090] (Examples 22 to 24) A conductive roll was fabricated in the same manner as in Example 21, except that the blending amount of Compound <1> was changed in the preparation of the conductive rubber composition.

[0091] (Examples 25 to 28) A conductive roll was fabricated in the same manner as in Example 21, except that the type and blending amount of the compound were changed in the preparation of the conductive rubber composition.

[0092] (Examples 29 to 32) A conductive roll was fabricated in the same manner as in Examples 21 to 24, except that an elastomer layer was directly formed on the outer periphery of an iron core bar plated with nickel without forming an adhesive layer.

[0093] (Comparative Example 1) A conductive roll was fabricated in the same manner as in Example 1, except that the blending amount of Compound <1> was changed in the preparation of the adhesive composition, and the type and blending amount of the ionic conductive agent were changed in the preparation of the conductive rubber composition.

[0094] (Comparative Examples 2 - 3) In the preparation of the adhesive composition, a conductive roll was produced in the same manner as in Example 1, except that the types and amounts of the compounds were changed.

[0095] (Comparative Example 4) In the preparation of the adhesive composition, a conductive roll was produced in the same manner as in Example 1, except that no compound was blended.

[0096] The following materials were prepared as a compound having an epoxy group and an ester group and an ionic conductive agent. (Compound having an epoxy group and an ester group) · Compound <1>: "ARUFON UG - 4040" manufactured by Toagosei Co., Ltd., weight average molecular weight Mw 11,000, having an aromatic ring · Compound <2>: "Marproof G - 1005SA" manufactured by NOF Corporation, weight average molecular weight Mw 100,000, having an aromatic ring · Compound <3>: "ARUFON UG - 4070" manufactured by Toagosei Co., Ltd., weight average molecular weight Mw 9,700, having an aromatic ring · Compound <4>: "Marproof G - 2050M" manufactured by NOF Corporation, weight average molecular weight Mw 200,000, having an aromatic ring · Compound <5>: "ARUFON UG - 4010" manufactured by Toagosei Co., Ltd., weight average molecular weight Mw 2,900, having no aromatic ring · Compound <6>: "JER1256" manufactured by Mitsubishi Chemical Corporation, weight average molecular weight Mw 50,000, having an aromatic ring · Compound <7>: "ARUFON UH - 2170" manufactured by Toagosei Co., Ltd., weight average molecular weight Mw 14,000, having an aromatic ring

[0097] (Ionic conductive agent) · Ionic conductive agent <1>: Sulfonium salt, "PEL - 25" (Li·ClO4, Li·CF3SO3) manufactured by Nippon Carlit Co., Ltd. · Ionic conductive agent <2>: Ammonium salt, "T0676" ((CH3)4N·OH) manufactured by TCI AMERICA ·Ionic conductor <3>: Phosphonium salt, "H1047" manufactured by TCI AMERICA ((n-Bu)3(CH3(CH2) 15 P·Br) ·Ionic conductor <4>: Imidazolium salt, "IL-IM1" manufactured by Hiroei Chemical

[0098] (Swelling on the roll surface: Corrosion of the core metal) When the fabricated conductive roll was left standing in an environment of 50°C temperature and 95% humidity for one month, those with no swelling on the roll surface were rated "◎", those with slight swelling but within the allowable range were rated "○", those with swelling equivalent to the current product were rated "△", and those with swelling at a level outside the allowable range were rated "×".

[0099] (Black dots LL: High resistance and discharge unevenness) The fabricated conductive roll was incorporated as a charging roll into a Konica Minolta multifunction machine "bizhubC658". After printing 2 million sheets in ruled line mode with a printing density of 1% in an environment of 10°C and 10% RH, a halftone image with a printing density of 25% was printed. Those with no black dot image caused by discharge unevenness were rated very good "◎", those with slightly confirmed black dot images but within the allowable range were rated good "○", those with black dot images equivalent to the current product were rated "△", and those with clearly confirmed black dot images were rated poor "×".

[0100] (Fogging LL: High resistance and low capacitance resulting in insufficient discharge) The fabricated conductive roll was incorporated as a charging roll into a Konica Minolta multifunction machine "bizhubC658". After printing 2 million sheets in ruled line mode with a printing density of 1% in an environment of 10°C and 10% RH, a halftone image with a printing density of 25% was printed. Those with no fogging image caused by insufficient discharge were rated very good "◎", those with slightly confirmed fogging images but within the allowable range were rated good "○", those with fogging images equivalent to the current product were rated "△", and those with clearly confirmed fogging images were rated poor "×".

[0101] (Bleed) The fabricated conductive roll was incorporated as a charging roll into the multifunction printer "bizhub C658" manufactured by Konica Minolta. After printing 2 million sheets in the ruled line mode with a printing density of 1% under the environment of 10°C × 10% RH, a halftone image with a printing density of 25% was printed. When no bleed-out due to the ion conductive agent was confirmed on the surface of the conductive roll, it was rated as very good "◎"; when bleed-out was slightly confirmed but within the allowable range, it was rated as good "○"; when bleed-out was confirmed to be equivalent to the current level, it was rated as "△"; when bleed-out was clearly confirmed, it was rated as bad "×".

[0102]

Table 1

[0103]

Table 2

[0104]

Table 3

[0105]

Table 4

[0106]

Table 5

[0107] The conductive rolls of Examples 1 to 15 have a metal shaft body, an adhesive layer, and an elastic body layer in this order, the elastic body layer contains a polymer containing a halogen atom and an ionic conductive agent which is any one of a sulfonium salt, an ammonium salt, and a phosphonium salt, and the adhesive layer contains a compound having an epoxy group and an ester group. The conductive rolls of Examples 21 to 28 have a metal shaft body, an adhesive layer, and an elastic body layer in this order, the elastic body layer contains a polymer containing a halogen atom and an ionic conductive agent which is any one of a sulfonium salt, an ammonium salt, and a phosphonium salt, and the elastic body layer contains a compound having an epoxy group and an ester group. The conductive rolls of Examples 29 to 32 have a metal shaft body and an elastic body layer in this order, the elastic body layer contains a polymer containing a halogen atom and an ionic conductive agent which is any one of a sulfonium salt, an ammonium salt, and a phosphonium salt, and the elastic body layer contains a compound having an epoxy group and an ester group.

[0108] That is, the conductive rolls of Examples 1 to 15 and 21 to 32 include at least a metal shaft body and an elastic body layer. The elastic body layer contains a polymer containing a halogen atom and an ionic conductive agent composed of one or more of a sulfonium salt, an ammonium salt, and a phosphonium salt, and contains a compound having an epoxy group and an ester group in the range from the outer side of the outer peripheral surface of the metal shaft body to the inside of the elastic body layer. And according to the examples, it can be seen that swelling, black dot images, fogging on the roll surface, and bleed-out of the ionic conductive agent are suppressed, and image defects due to core metal corrosion and bleed-out of the ionic conductive agent are suppressed.

[0109] In contrast, in Comparative Example 1, the ionic conductive agent in the elastomer layer is composed of an imidazolium salt. Due to the influence of steric hindrance, the compound having an epoxy group and an ester group in the adhesive layer cannot immobilize the imidazolium salt, and thus core metal corrosion and bleed-out of the ionic conductive agent cannot be suppressed. Further, in Comparative Example 2, although the ionic conductive agent in the elastomer layer is of a specific type, the compound in the adhesive layer has an epoxy group but no ester group. For this reason, the ionic conductive agent cannot be immobilized, and bleed-out of the ionic conductive agent cannot be suppressed. Further, in Comparative Example 3, although the ionic conductive agent in the elastomer layer is of a specific type, the compound in the adhesive layer has an ester group but no epoxy group. For this reason, the acid caused by the halogen atom cannot be trapped, and core metal corrosion cannot be suppressed. In Comparative Example 4, in the range from the outer side of the outer peripheral surface of the metal shaft body to the inside of the elastomer layer, there is no compound having an epoxy group and an ester group. For this reason, the acid caused by the halogen atom cannot be trapped, and core metal corrosion cannot be suppressed. Further, the ionic conductive agent cannot be immobilized, and bleed-out of the ionic conductive agent cannot be suppressed.

[0110] And from Examples 1 to 4, it can be seen that when the content of the compound having an epoxy group and an ester group is 0.004 parts by mass or more and 15 parts by mass or less with respect to 100 parts by mass of the binder in the adhesive layer, the effect of trapping the acid caused by the halogen atom is excellent, and the increase in resistance (black dot image) due to the compound is easily suppressed. Similarly, from Examples 21 to 24, it can be seen that when the content of the compound having an epoxy group and an ester group is 0.004 parts by mass or more and 15 parts by mass or less with respect to 100 parts by mass of the polymer containing halogen atoms in the elastomer layer, the effect of trapping the acid caused by the halogen atom is excellent, and the increase in resistance (black dot image) due to the compound is easily suppressed.

[0111] Also, from Examples 1, 5 to 8, when the weight average molecular weight Mw of the compound having an epoxy group and an ester group is 5,000 or more and 150,000 or less, it is easy to suppress the decrease in the immobilization effect of the ionic conductive agent due to the shortage of the ester group, and it is also easy to suppress the increase in resistance (fogging) caused by the compound. Similarly, from Examples 21, 25 to 28, when the weight average molecular weight Mw of the compound having an epoxy group and an ester group is 5,000 or more and 150,000 or less, it is easy to suppress the decrease in the immobilization effect of the ionic conductive agent due to the shortage of the ester group, and it is also easy to suppress the increase in resistance (fogging) caused by the compound.

[0112] Also, from Examples 1, 12 to 15, when the content of the ionic conductive agent is 0.2 parts by mass or more and 6.5 parts by mass or less with respect to 100 parts by mass of the polymer containing a halogen atom, it is excellent in the effect of reducing resistance (fogging suppression), and it is found that bleeding out of the ionic conductive agent due to the increase in amount is easily suppressed.

[0113] As described above, the embodiments and examples of the present invention have been explained. However, the present invention is not limited to the above embodiments and examples at all, and various modifications are possible without departing from the gist of the present invention.

Explanation of Reference Numerals

[0114] 10, 20 Conductive roll 12 Shaft body 14 Elastic body layer 16 Surface layer 18 Adhesive layer

Claims

1. It includes at least a metallic shaft body and an elastic body layer disposed outside the outer peripheral surface of the shaft body. The elastic body layer contains a polymer containing a halogen atom and an ionic conductive agent composed of any one or more of sulfonium salts, ammonium salts, and phosphonium salts. A conductive roll for electrophotographic equipment, which contains a compound having an epoxy group and an ester group in the range from the outside of the outer peripheral surface of the shaft body to the inside of the elastic body layer.

2. The shaft body and the elastic body layer are adhered via an adhesive layer, and the conductive roll for electrophotographic equipment according to Claim 1, wherein one or both of the elastic body layer and the adhesive layer contain a compound having an epoxy group and an ester group.

3. The conductive roll for electrophotographic equipment according to Claim 1 or Claim 2, wherein the polymer containing a halogen atom is hydrin rubber.

4. The conductive roll for electrophotographic equipment according to Claim 2, wherein the adhesive layer contains a compound having an epoxy group and an ester group.

5. The conductive roll for electrophotographic equipment according to Claim 2, wherein the elastic body layer contains a compound having an epoxy group and an ester group.

6. The content of the compound having an epoxy group and an ester group is 0.004 parts by mass or more and 15 parts by mass or less with respect to 100 parts by mass of the binder of the adhesive layer. The conductive roll for electrophotographic equipment according to Claim 4.

7. The content of the compound having an epoxy group and an ester group is 0.004 parts by mass or more and 15 parts by mass or less with respect to 100 parts by mass of the polymer containing a halogen atom in the elastic body layer. The conductive roll for electrophotographic equipment according to Claim 5.

8. The content of the ionic conductive agent is 0.2 parts by mass or more and 6.5 parts by mass or less with respect to 100 parts by mass of the polymer containing a halogen atom. The conductive roll for electrophotographic equipment according to Claim 1 or Claim 2.

9. The weight average molecular weight Mw of the compound having an epoxy group and an ester group is 5,000 or more and 150,000 or less. The conductive roll for electrophotographic equipment according to Claim 1 or Claim 2.

10. The compound having an epoxy group and an ester group has an aromatic ring. The conductive roll for electrophotographic equipment according to Claim 1 or Claim 2.

11. The shaft body and the elastic body layer are adhered via an adhesive layer. The polymer containing a halogen atom is hydrin rubber. The adhesive layer contains a compound having an epoxy group and an ester group. The content of the compound having an epoxy group and an ester group is 0.004 parts by mass or more and 15 parts by mass or less with respect to 100 parts by mass of the binder of the adhesive layer. The content of the ionic conductive agent is 0.2 parts by mass or more and 6.5 parts by mass or less with respect to 100 parts by mass of the polymer containing a halogen atom. The weight average molecular weight Mw of the compound having an epoxy group and an ester group is 5,000 or more and 150,000 or less. The compound having an epoxy group and an ester group has an aromatic ring. The conductive roll for electrophotographic apparatus according to claim 1.

12. The shaft body and the elastic body layer are adhered via an adhesive layer. The polymer containing a halogen atom is epichlorohydrin rubber. The elastic body layer contains a compound having an epoxy group and an ester group. The content of the compound having an epoxy group and an ester group is 0.004 parts by mass or more and 15 parts by mass or less with respect to 100 parts by mass of the polymer containing a halogen atom in the elastic body layer. The content of the ionic conductive agent is 0.2 parts by mass or more and 6.5 parts by mass or less with respect to 100 parts by mass of the polymer containing a halogen atom. The weight average molecular weight Mw of the compound having an epoxy group and an ester group is 5,000 or more and 150,000 or less. The compound having an epoxy group and an ester group has an aromatic ring. The conductive roll for electrophotographic apparatus according to claim 1.

13. The shaft body and the elastic body layer are directly adhered, and the elastic body layer contains a compound having an epoxy group and an ester group. The conductive roll for electrophotographic apparatus according to claim 1.

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