JPH1165268A - Conductive roll - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a conductive roll capable of keeping initial good image quality for a long time and which is excellent in toner filming property. SOLUTION: As to this conductive roll; an innermost layer 11 is formed on the outer peripheral surface of a shaft body 10, an intermediate layer 12 is formed on the outer peripheral surface of the layer 11, and an outermost layer 13 is formed on the outer peripheral surface of the layer 12. The layer 13 is formed of a silicone resin layer having the thickness of 0.5 μm, and also the electric resistance value of the roll except the layer 13 is set to <=1×10<9> Ω.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conductive roll used in an electrophotographic apparatus such as a copying machine and a printer.

[0002]

2. Description of the Related Art Generally, copying by an electrophotographic copying machine is performed as follows. That is, a document image is formed as an electrostatic latent image on a photosensitive drum rotating about an axis, and toner is adhered to the image to form a toner image. Next, copying is performed by transferring the toner image to copy paper.
In this case, in order to form an electrostatic latent image on the surface of the photosensitive drum, the surface of the photosensitive drum is charged in advance, and a document image is projected on the charged portion through an optical system and irradiated with light. 2. Description of the Related Art An electrostatic latent image is formed by canceling the charge of a part. As a method for charging the surface of the photosensitive drum prior to the formation of the electrostatic latent image, recently, a roll charging method for charging the surface of the photosensitive drum by directly contacting a charging roll with the surface of the photosensitive drum has been adopted. . Further, as a method of forming a toner image on the electrostatic latent image formed on the surface of the photosensitive drum in this manner, a method using a developing roll (contact developing method) is employed. That is, the toner is frictionally charged and adheres to the surface of the developing roll, and the toner is transferred from the developing roll to the electrostatic latent image on the surface of the photosensitive drum, whereby a toner image is formed on the surface of the photosensitive drum. Copying is performed by fixing the toner image on copy paper.

As a roll such as a charging roll and a developing roll in the electrophotographic copying machine, for example, an elastic roll base having a low hardness elastic layer formed on the outer periphery of a shaft body may be used.
A roll on which a conductive coating layer is formed can be given. The conductive coating layer is, for example, after a conductive material such as conductive carbon is dispersed in a base resin solution in which polyurethane, polyester, or the like is dissolved, and then a mixed solution further containing a silicone compound is uniformly applied and dried. It is formed by this.

[0004]

However, when the above roll is used as a developing roll and subjected to a paper-passing durability test such as copying or facsimile, the silicone compound gradually exudes from the conductive coating layer on the developing roll surface. (Bleed-out), it is difficult to maintain the initial image quality, uneven density occurs, and the performance required for the developing roll cannot be maintained.

The present invention has been made in view of such circumstances, and has as its object to provide a conductive roll which can maintain good initial image quality for a long period of time and has excellent toner filming properties. .

[0006]

In order to achieve the above object, a conductive roll according to the present invention is a conductive roll in which two or more layers are formed on the outer peripheral surface of a shaft, Of these, the outermost layer is formed of a silicone resin layer having a thickness of 0.5 μm or less, and the electric resistance of the roll excluding the outermost layer is set to 1 × 10 ⁹ Ω or less.

The present inventors have conducted a series of studies to obtain a conductive roll capable of obtaining good image quality over a long period of use. First, research was conducted to find out the cause of the silicone compound coming out of the conductive coating layer on the surface of the developing roll, which was a problem of the conventional roll. As a result, in the material for forming the conductive coating layer, bleed out of the silicone compound can be suppressed to some extent because hydrogen bonding occurs between the base resin and the silicone compound, but it is not enough for long-term use. It was also found that the compatibility between the silicone compound and the base resin was not good. From this finding, the present inventors have come up with a completely different idea from the conventional idea of adding a silicone compound to a base resin. That is, it has been found that when the outermost layer portion is formed of a silicone resin, good image quality can be obtained over a long period of time without bleeding out of the silicone compound as in the related art. Further, the outermost layer made of the silicone resin is formed as a thin layer having a thickness of 0.5 μm or less, and the electric resistance of the roll until the outermost layer is formed is set to a specific value or less. The present inventors have found that preferable characteristics are imparted, and reached the present invention.

As a silicone resin forming the outermost layer, it has been found that it is particularly preferable to use a silicone resin represented by the general formula (1) as a material forming the outermost layer.

[0009]

Next, embodiments of the present invention will be described in detail.

[0010] The conductive roll of the present invention has two or more layers formed on the outer periphery of the shaft body, and the outermost layer among the above-mentioned layers is formed of a silicone resin layer having a specific thickness.

An example of the conductive roll of the present invention will be described with reference to FIG. The conductive roll includes a shaft 10, an innermost layer 11 formed along the outer peripheral surface of the shaft 10, and an intermediate layer 12 formed along the outer peripheral surface of the innermost layer 11.
And an outermost layer 13 formed along the outer peripheral surface of the intermediate layer 12.

The shaft body 10 is not particularly limited as long as it has conductivity, and a metal core made of a solid metal body or a metal cylindrical body whose inside is hollowed out is used. . Examples of the material of the shaft body 10 include aluminum and stainless steel.

The material for forming the innermost layer 11 formed on the outer peripheral surface of the shaft body 10 is, for example, polyurethane. This polyurethane is obtained using, for example, a polyisocyanate and a polyol.

The above-mentioned polyisocyanate is not particularly limited, and includes conventionally known ones. For example, 4,4'-diphenylmethane diisocyanate (M
DI), isophorone diisocyanate (IPDI),
4,4'-dicyclohexylmethane diisocyanate (hydrogenated MDI), trimethylhexamethylene diisocyanate (TMHDI), tolylene diisocyanate (T
DI), carbodiimide-modified MDI, polymethylenephenyl polyisocyanate (PAPI), orthotoluidine diisocyanate (TODI), naphthylene diisocyanate (NDI), xylene diisocyanate (XD
I), hexamethylene diisocyanate (HMDI),
Examples include paraphenylene diisocyanate (PDI), lysine diisocyanate methyl ester (LDI), and dimethyl diisocyanate (DDI). Above all,
It is preferable to use MDI, TODI, or the like.

The polyol used together with the above-mentioned polyisocyanate is not particularly restricted but includes, for example, polyethylene adipate (PEA), polybutylene adipate (PBA), polyhexylene adipate,
Polydiethylene adipate (PDA), polypropylene adipate (PPA), polyneopentyl adipate (PNA), copolymers of ethylene adipate and butylene adipate, polyester polyols such as poly-ε-caprolactan, polyoxytetramethylene glycol, poly Examples include polyether polyols such as oxypropylene glycol and polyoxyethylene glycol, dimethyl silicone polyols, fluorinated alkyl polyols, and carbonate-based polyols such as polyhexamethylene carbonate.

As a material for forming the innermost layer 11, a conductive substance is usually blended with the polyurethane. As the conductive material, conventionally used carbon black, graphite, potassium titanate, iron oxide,
c-TiO ₂ , c-ZnO, c-SnO ₂ , ionic conductive agents (quaternary ammonium salts, borates, surfactants, etc.) and the like. Note that the above “c−” indicates that it has conductivity.

As a material for forming the intermediate layer 12 formed on the outer peripheral surface of the innermost layer 11, for example, acrylonitrile-butadiene rubber (NBR), hydrogenated nitrile rubber (H
-NBR), hydrin rubber, ethylene-propylene-diene rubber, styrene-butadiene rubber, polyurethane elastomer, polyester, polyamide, N-methoxymethylated nylon, fluororesin, and the like, and a conductive material is preferably used. As the conductive material, the same conductive material as described in the material for forming the innermost layer 11 is used. Among them, hydrogenated nitrile rubber mixed with carbon black is more preferable in terms of adhesiveness and stability as a coating material.

As a material for forming the outermost layer 13 formed on the outer peripheral surface of the intermediate layer 12, a silicone resin is used.
That is, the most characteristic feature of the present invention is that a silicone resin is used as a material for forming the outermost layer 13.
As the silicone resin, for example, a silicone resin represented by the following general formula (1) is suitably used.
In the present invention, the silicone resin refers to a polyorganosiloxane containing a trifunctional or tetrafunctional siloxane unit in a molecule, and has a significantly higher crosslinking density than silicone oil or silicone rubber. is there.

[0019]

Embedded image

The silicone resin represented by the general formula (1) includes a one-pack type and a two-pack type, and its curing reaction types include a heat-curing type and a room-temperature (moisture) -curing type. .

The silicone resin represented by the general formula (1) is obtained by mixing a resin represented by the following formula (2) and a resin represented by the following formula (3).

[0022]

Embedded image

The conductive roll of the present invention is manufactured, for example, as follows. That is, first, the innermost layer 1
1 The components constituting the forming material are kneaded using a kneading machine such as a kneader to prepare a compound-like innermost layer 11 forming material. The material for forming the intermediate layer 12 and the outermost layer 1
3. Prepare each coating liquid to be a forming material. Each of the above coating liquids is prepared by kneading the above components using a kneader such as a ball mill or a roll, adding an organic solvent to the mixture, mixing and stirring.

Examples of the organic solvent include methyl ethyl ketone (MEK), methanol, toluene, isopropyl alcohol, methyl cellosolve, dimethylformamide,
Examples include methyl isobutyl ketone, acetone, tetrahydrofuran (THF), ethyl acetate, butyl acetate and the like. These may be used alone or in combination of two or more.

Next, a metal shaft (core bar) is prepared.
As shown in FIG. 2, the compound-like innermost layer 11 forming material is poured into a lower lid 21 and a cylindrical mold 22 on which the metal shaft 10 is set, and the upper lid 23 is fixed to the cylindrical mold 2.
Externally fit to 2. Then, the entire roll mold is heated to crosslink the compound-like innermost layer 11 forming material, thereby forming the innermost layer 11. Next, after removing the shaft body 10 on which the innermost layer 11 is formed, a coating liquid as a material for forming the intermediate layer 12 is applied to the outer peripheral surface of the innermost layer 11, or the innermost layer 11 is already formed. After the roll is immersed in the coating liquid and pulled up, drying and heat treatment are performed, so that the intermediate layer 12
To form Further, a coating liquid serving as a material for forming the outermost layer 13 is applied to the outer peripheral surface of the intermediate layer 12, or the roll on which the intermediate layer 12 has been formed is immersed in the coating liquid and pulled up, followed by drying and heat treatment. As a result, the outermost layer 13 is formed on the outer peripheral surface of the intermediate layer 12. The method of applying the coating liquid is not particularly limited, and includes a conventionally known dipping method, spray coating method, roll coating method, and the like. Thus, a conductive roll having the innermost layer 11, the intermediate layer 12, and the outermost layer 13 formed in this order on the outer periphery of the shaft body 10 is manufactured.

In the conductive roll of the present invention thus obtained, the electric resistance of the innermost layer 11 is 1 × 10 ³
It is preferable to adjust so as to be within a range of 1 × 10 ¹⁰ Ω · cm, particularly preferably 1 × 10 ⁴ to 1 × 10 ⁸ Ω · cm.
cm. Further, the electric resistance of the intermediate layer 12 is preferably adjusted to a range of 1 × 10 ² to 1 × 10 ⁸ Ω · cm, particularly preferably 1 × 10 ⁴ to 1 × 10 ⁸ Ω · cm.
It is in the range of ⁷ Ω · cm. The electric resistance of the roll (excluding the outermost layer 13) composed of the shaft 10, the innermost layer 11, and the intermediate layer 12 needs to be adjusted to 1 × 10 ⁹ Ω or less, and preferably 1 × 10 ⁹ Ω. × 10 ³ -1 × 10
The range is ⁸ Ω. As described above, since the silicone resin forming the outermost layer 13 has an electrical insulating property, the electric resistance of the roll until the outermost layer 13 is formed is set to a certain low value, and the roll is set to be conductive. It must be made semiconductive by formation. That is, when the electric resistance of the roll (excluding the outermost layer 13) exceeds 1 × 10 ⁹ Ω,
This is because desired conductivity cannot be obtained as a whole of the conductive roll, and as a result, a good copied image cannot be obtained.

The electric resistance of each of the above layers is determined in accordance with JIS K
It is a value measured according to the method described in 6911. More specifically, the electric resistance of each of the above layers is measured as follows. That is, a sheet of each layer forming material was prepared, and 10 m of silver paste was formed on the outer surface of the sheet.
Draw electrodes of m squares (with guard electrodes), provide opposing electrodes on the opposite side of the sheet, and measure the electrical resistance between the electrodes.
Note that a DC voltage of 10 V is applied between the electrodes.

In the above conductive roll, the thickness of the innermost layer 11 is preferably set in the range of 2 to 10 mm,
Particularly preferably, it is in the range of 3 to 6 mm. The thickness of the intermediate layer 12 is preferably set in the range of 1 to 90 μm, particularly preferably in the range of 5 to 15 μm.
The thickness of the outermost layer 13 needs to be set to 0.5 μm or less. Preferably, it is in the range of 0.2 to 0.5 μm. That is, when the thickness of the outermost layer 13 exceeds 0.5 μm and the layer becomes thicker, the hardness is increased and a low-hardness roll cannot be obtained. In addition, since the outermost layer 13 is formed of an insulating silicone resin, the electric resistance is high. This is because a roll having a desired conductivity cannot be obtained because of too much.

As described above, the conductive roll of the present invention comprises:
It is not limited to the three-layer structure,
At least two layers may be formed. And of that layer
Of these, the outermost layer has a thickness of 0.
Formed by a silicone resin layer of 5 μm or less,
The electric resistance of the roll excluding the outermost layer is 1 × 10 ⁹
Must be set to Ω or less.

FIG. 3 shows another example of the conductive roll of the present invention. The conductive roll includes a shaft 10 and the shaft 10.
Is a roll having a two-layer structure formed of an innermost layer 15 formed along the outer peripheral surface of the innermost layer 15 and an outermost layer 16 made of silicone resin formed along the outer peripheral surface of the innermost layer 15. In such a two-layer roll, the innermost layer 15
The forming material is not particularly limited. For example, based on the above-described polyurethane of the innermost layer forming material of the three-layer structure roll, a conductive polyurethane in which the conductive substance is blended, or Conductive silicone rubber and the like can be mentioned. When conductive polyurethane is used as the material for forming the innermost layer 15, there are abundant materials suitable for various uses and various conductive agents can be used, so that a base roll having a wide range of electric resistance can be produced. . When conductive silicone rubber is used as the material for forming the innermost layer 15, a wide range of hardness can be selected, so that low hardness (JIS A 20 ° or less) is possible and compression set is also reduced. Good.

As described above, even in such a conductive roll having a two-layer structure, the outermost layer is
It is formed of a silicone resin layer having a thickness of 0.5 μm or less, preferably a silicone resin layer having a thickness of 0.2 to 0.5 μm, and the electric resistance of the roll excluding the outermost layer is preferably 1 × 10 ⁹ Ω or less. Is 1 × 10 ³ to 1 × 10
Set to the range of ⁸ Ω.

Such a conductive roll can be used, for example, as a paper feed roll, a charging roll, a developing roll, and a transfer roll.

Next, examples will be described together with comparative examples.

[0034]

Examples 1 to 8 and Comparative Examples 1 to 9 First, a SUS303 core (diameter: 10 mm) was prepared. Table 1 below
The components shown in Table 6 were blended in the proportions shown in the same table to prepare materials for forming each layer. First, 1 part of conductive carbon was added to 100 parts by weight of polyester polyol (Nipporan N-4032, manufactured by Nippon Polyurethane Industry Co., Ltd.) (hereinafter abbreviated as "parts") and uniformly dispersed, and then heated to 140 ° C. Then, with stirring under reduced pressure of 10-20 mmHg, 12
It was dehydrated and dried for a sufficient time. This is further reduced to 110 to 12
The temperature was adjusted to 0 ° C, 7 parts of tolylene diisocyanate (Coronate T-65, manufactured by Nippon Polyurethane Industry Co., Ltd.) was added to 100 parts of the polyol, and the mixture was mixed vigorously for 2 minutes.
Pour into the core mold set cylindrical mold heated to ℃
Cured for 2 hours. After removal from the mold, another 110
By performing secondary crosslinking at 24 ° C. for 24 hours, a roll having the innermost layer formed on the outer peripheral surface of the cored bar was produced. On the other hand, in Example 8, as shown in Table 1 below, silicone rubber was used as the innermost layer forming material.

Next, the intermediate layer and the outermost layer are sequentially formed on the outer peripheral surface of the innermost layer by a roll coating method using the intermediate layer forming material and the outermost layer forming material. A roll was made.
In Examples 7 and 8, no intermediate layer was formed, and a conductive roll having a two-layer structure of an innermost layer and an outermost layer was produced.

[0036]

[Table 1]

[0037]

[Table 2]

[0038]

[Table 3]

[0039]

[Table 4]

[0040]

[Table 5]

[0041]

[Table 6]

The thickness and electric resistance of each layer of the conductive roll thus obtained (the roll excluding the outermost layer and the entire roll on which the outermost layer was formed) are also shown in Tables 7 to 10 below. In addition, a solvent resistance test was conducted using a conductive roll according to the following method, and the results are shown in Tables 7 to 10 below.

[Electrical Resistance] For each conductive roll, the electric resistance of each of the innermost layer, the intermediate layer and the outermost layer, and the electric resistance of the roll excluding the outermost layer (before forming the outermost layer) and the entire roll having the outermost layer formed thereon Was measured by the following method. That is, the surface of the layer to be measured is 10 m
An m-square electrode (with guard) is provided, and the resistance between the
It was measured according to the method of IS K6911.

[Solvent resistance] Isopropyl alcohol (I
PA) was impregnated with Bencott Lint Free CT-8 (manufactured by Asahi Kasei Corporation), and the surface of each conductive roll was lightly rubbed.
Then, the roll surface was visually observed. As a result, ○ indicates that the roll surface state did not change, △ indicates that the roll surface was slightly scraped (scratched, etc.), and × indicates that the roll surface was melted and the surface layer was lost. Displayed as

Further, each conductive roll was incorporated in a commercially available electrophotographic copying machine, and actual copying was performed. Then, image evaluation was performed according to the following criteria. The results are shown in Tables 7 to 10 below.

[Sensitivity of the photosensitive material]
Apply a load of 00g and press against the photoreceptor, 45 ° C x 9
It was left for one month in a 0% temperature and humidity environment. Then, this photoconductor is incorporated into an electrophotographic copying machine, and an image is displayed.
When the roll mark was not recognized by the tenth sheet, it was indicated by ○, and when it was recognized, it was indicated by ×.

[Image Quality] The image quality of the copied image at the beginning of copying and after copying 3000 sheets was visually evaluated. That is, a character was copied, and a copy image having no problem and a fine line was clearly copied was evaluated as 、; a slightly blurred or fogged image was evaluated as △; a blurred or fogged image was generated as x.
Respectively. In addition, the blur refers to an image in which a thin line is interrupted, and the fog refers to an image in which toner has flown to a place where there is no image.

[Filming Resistance] In the portion where the toner is thickly adhered to the surface of the conductive roll, the chargeability is deteriorated and the copy image is defective. Specifically, if a portion of the toner component adheres to the surface of the conductive roll with a thickness of 1 μm or more, the image is significantly deteriorated. Therefore, a toner film having a thickness of 1 μm or more was determined to have toner filming. Then, those in which toner filming occurred were indicated by x, and those in which toner filming did not occur were indicated by ○.

[0049]

[Table 7]

[0050]

[Table 8]

[0051]

[Table 9]

[0052]

[Table 10]

From the results of Tables 7 to 10, the outermost layer of the conductive roll of the example product had a thickness of 0.5 μm or less, and the electric resistance of the roll before forming the outermost layer was 1 × 10 ^9.
Ω or less, good image quality was obtained both at the beginning of copying and after copying. Moreover,
Good results were also obtained in all of the solvent resistance, the photographic material stain resistance and the filming resistance.

On the other hand, the outermost layers of the conductive rolls of Comparative Examples 1 to 7 were formed of a forming material obtained by adding various silicone oils to the base resin. Due to the thickness, the photosensitive material stainability and filming resistance were poor, and the image quality evaluation after 3000 copies was poor. In Comparative Example 8, the outermost layer was formed of a silicone resin, but the thickness was 0.1 mm.
6 μm and more than 0.5 μm.
Especially, the image quality evaluation after copying 3000 sheets was inferior. Also,
In Comparative Example 9, the electric resistance of the roll before forming the outermost layer was 1 ×.
It was higher than 10 ⁹ Ω, and the image quality evaluation was inferior both in the initial stage and after 3000 copies.

[0055]

As described above, in the conductive roll of the present invention, the outermost layer is formed of a silicone resin layer having a thickness of 0.5 μm or less, and the electric resistance of the roll excluding the outermost layer is 1 × 10 ^9. Since it is set to Ω or less, there is no problem that the silicone compound added to the base resin bleeds out and it is impossible to maintain an initial good image quality as in the related art, and it has to have appropriate electric resistance. Together, excellent image quality can be obtained over a long period of time. In addition, inconvenience such as uneven density does not occur.

As the silicone resin forming the outermost layer, it is particularly preferable to use the silicone resin represented by the general formula (1) from the viewpoint of forming a thin film as the outermost layer.

As the conductive roll of the present invention, an innermost layer made of conductive silicone rubber is formed.
On the outer peripheral surface of this innermost layer, a silicone resin layer having a thickness of 0.5 μm or less as an outermost layer was formed, or an innermost layer made of conductive polyurethane was formed, and on the outer peripheral surface of the innermost layer, an outermost layer was formed. A conductive roll having a two-layer structure on which a silicone resin layer having a thickness of 0.5 μm or less is formed. Such a conductive roll having a two-layer structure has a simple structure, facilitates the manufacturing process, and is a roll that makes the most of the characteristics of the base rubber material (the innermost layer forming material).

Further, in addition to the above-mentioned conductive roll having a two-layer structure, an innermost layer made of conductive silicone rubber or conductive polyurethane is formed, and a conductive substance is added to the hydrogenated nitrile rubber on the outer peripheral surface of the innermost layer. A conductive roll having a three-layer structure in which an intermediate layer formed using the added forming material is formed, and a silicone resin layer having a thickness of 0.5 μm or less as an outermost layer is formed on the outer peripheral surface of the intermediate layer. Can be Such a three-layer conductive roll can adapt to various base rubber materials by adjusting the electric resistance of the roll before forming the outermost layer by arbitrarily changing the electric resistance of the intermediate layer.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view showing an example of a conductive roll of the present invention, and FIG. 1B is a cross-sectional view taken along the line AA of FIG.

FIG. 2 is a cross-sectional view schematically showing one example of a method for producing a conductive roll of the present invention.

FIG. 3 is a sectional view showing another example of the conductive roll of the present invention.

[Explanation of symbols]

 10 shaft body 11 innermost layer 12 middle layer 13 outermost layer

Continuation of the front page (72) Inventor Kenichi Ohhoe Komaki City, Aichi Prefecture Oita Kita-gaiyama character Gezu 3600 Tokai Rubber Industries Co., Ltd.

Claims (6)

[Claims] 1. A conductive roll having two or more layers formed on an outer peripheral surface of a shaft body, wherein the outermost layer is formed of a silicone resin layer having a thickness of 0.5 μm or less. The electric resistance of the roll excluding the outermost layer is 1 × 10 ⁹
A conductive roll characterized by being set to Ω or less. 2. The conductive roll according to claim 1, wherein the silicone resin layer is formed of a silicone resin represented by the following general formula (1). Embedded image 3. An innermost layer made of conductive silicone rubber is formed on the outer peripheral surface of the shaft body, and a 0.5 μm-thick or less silicone resin layer as an outermost layer is formed on the outer peripheral surface of the innermost layer. The conductive roll according to claim 1. 4. An innermost layer made of conductive polyurethane is formed on an outer peripheral surface of the shaft, and a silicone resin layer having a thickness of 0.5 μm or less as an outermost layer is formed on an outer peripheral surface of the innermost layer. Item 3. The conductive roll according to Item 1 or 2. 5. An innermost layer made of conductive polyurethane is formed on the outer peripheral surface of the shaft body, and the innermost layer of the innermost layer is formed using a forming material obtained by adding a conductive substance to hydrogenated nitrile rubber. An intermediate layer is formed, and on the outer peripheral surface of the intermediate layer,
3. The conductive roll according to claim 1, wherein a silicone resin layer having a thickness of 0.5 μm or less as an outermost layer is formed. 6. An innermost layer made of conductive silicone rubber is formed on an outer peripheral surface of a shaft body, and an innermost layer of the innermost layer is formed using a forming material obtained by adding a conductive substance to hydrogenated nitrile rubber. 3. The conductive roll according to claim 1, wherein an intermediate layer is formed, and a silicone resin layer having a thickness of 0.5 μm or less as an outermost layer is formed on an outer peripheral surface of the intermediate layer.