JP2002311722A - Intermediate transfer member and intermediate transfer device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intermediate transfer member which makes it possible to stably obtain good images for a long period of time with a simple structure and an intermediate transfer device including this intermediate transfer member. SOLUTION: This intermediate transfer member 20 which has a cylindrical substrate 21 and a surface layer 22 formed on the outer peripheral surface of the cylindrical substrate 21, and which is disposed between an image forming body 1 and a recording medium 24, transfers and holds the toner image formed on the surface of the image forming body 1 once on its own surface and transfers this image to the recording medium 24, is characterized in that the substrate 21 described above is formed of a conductive resin composition containing a polyamide resin obtainable from methaxylene diamine and adipic acid and/or a polyamide resin obtainable from εcaprolactam as a resin component and contains a conducting agent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming method such as a latent image holding member having an electrostatic latent image on the surface in an electrostatic recording process in an electrophotographic apparatus such as a copying machine or a printer or an electrostatic recording apparatus. An intermediate transfer member for temporarily transferring and holding a toner image formed by supplying toner to the body surface before transferring it to a recording medium such as paper, and transferring this to the recording medium;
And an intermediate transfer device provided with the intermediate transfer member.

[0002]

2. Description of the Related Art Conventionally, in an electrophotographic image forming apparatus such as a copying machine or a printer, first, the surface of a photosensitive member (image forming member) is uniformly charged by a charging means such as a charging roller.
An electrostatic latent image is formed by projecting an image from the optical system onto the photoreceptor and erasing the charged portion of the light-irradiated portion, and then supplying toner to the electrostatic latent image by developing means such as a developing roller. To form a toner image by electrostatic adhesion of the toner, transfer the toner image to a recording medium such as paper by a transfer unit such as a transfer roller, and heat the transferred image to the recording medium by a fixing unit such as a fixing roller. A method of fixing and obtaining a print image is employed.

In this case, even in a color printer or a color copying machine, printing is basically performed according to the above-described process. However, in the case of a color image, magenta, yellow, cyan, and black toners are used. In order to obtain a color tone, a step of obtaining a necessary color tone by superposing these toners at a predetermined ratio is required, and several methods have been proposed for performing this step.

First, as in the case of a monochrome image, when toner is supplied onto a photoreceptor to visualize an electrostatic latent image, the four colors of magenta, yellow, cyan, and black are used.
There is a multiple development system in which development is performed by sequentially superimposing color toners to form a color toner image on a photoconductor. According to this method, it is possible to configure the apparatus relatively compact, but in this method, there is a problem that it is very difficult to control the gradation and high image quality cannot be obtained.

Second, by providing four photosensitive members and developing the latent images of the respective photosensitive members with magenta, yellow, cyan, and black toners, respectively, a magenta toner image, a yellow toner image, and a cyan toner Forming four toner images of an image and a toner image of black,
There is a tandem system in which a photoconductor on which these toner images are formed is arranged in a line, and each toner image is sequentially transferred to a recording medium such as paper and superimposed on the recording medium to reproduce a color image. In this method, although good image quality is obtained, the four photoconductors, and a charging mechanism and a developing mechanism provided for each photoconductor are arranged in a line, so that the apparatus becomes large and expensive. Will be.

Third, a recording medium such as paper is wound around a transfer drum and rotated four times, and magenta, yellow, cyan, and black on the photoreceptor are sequentially transferred to the recording medium for each revolution to reproduce a color image. There is also a transfer drum system that performs the transfer. According to this method, relatively high image quality can be obtained, but when the recording medium is thick paper such as a postcard, it is difficult to wind it around the transfer drum, and the type of recording medium is limited. There is a point.

As compared with the above-mentioned multiple developing system, tandem system and transfer drum system, good image quality can be obtained, the apparatus is not particularly enlarged, and the type of recording medium is particularly limited. An intermediate transfer system has been proposed as a system that does not have this problem.

That is, in the intermediate transfer system, an intermediate transfer member including a drum and a belt for temporarily transferring and holding a toner image on a photosensitive member is provided, and a magenta toner image, a yellow toner image, a cyan toner image, and a black By sequentially transferring the toner images of the four colors of the toner image onto the intermediate transfer member, a color image is formed on the intermediate transfer member, and the color image is transferred onto a recording medium such as paper. Therefore, since the gradation is adjusted by superimposing the four color toner images, it is possible to obtain high image quality, and it is not necessary to arrange the photoconductors in a line as in the tandem method. In particular, there is no need to increase the size of the recording medium, and there is no need to wind the recording medium around the drum, so that the type of the recording medium is not limited.

Here, as an apparatus for forming a color image by such an intermediate transfer method, an image forming apparatus shown in FIG. 1 using a drum-shaped intermediate transfer member can be exemplified.

That is, in FIG. 1, reference numeral 1 denotes a drum-shaped photosensitive member which rotates in the direction of the arrow in the figure. The photoreceptor 1 is charged by a primary charger 2, and then the exposed portion is erased by an image exposure 3 to form an electrostatic latent image corresponding to the first color component on the photoreceptor 1. The electrostatic latent image is developed with the first color magenta toner M by the developing device 41, and the first color magenta toner image is
Formed on top. Then, this toner image is
The image is transferred to a drum-shaped intermediate transfer member 20 which rotates while contacting the image. In this case, the photosensitive member 1 is moved to the intermediate transfer member 20.
The transfer to the intermediate transfer member 20 is performed by a primary transfer bias applied from the power supply 61 to the intermediate transfer member 20 at a nip portion between the photosensitive member 1 and the intermediate transfer member 20. This intermediate transfer member 2
After the magenta toner image of the first color is transferred to 0, the surface of the photoconductor 1 is cleaned by the cleaning device 14, and the development transfer operation of the photoconductor 1 in the first rotation is completed.
Thereafter, the photoconductor 1 rotates three times, and the developing devices 42 to
The cyan toner image of the second color, the yellow toner image of the third color, and the black toner image of the fourth color are sequentially formed on the photoreceptor 1 by sequentially using the reference numerals 44, and are superimposedly transferred to the intermediate transfer member 20 every rotation. A composite color toner image corresponding to the target color image is formed on the intermediate transfer member 20.

Next, the transfer roller 25 contacts the intermediate transfer member 20 on which the composite color toner image is formed, and a recording medium 24 such as paper is fed from the paper feed cassette 9 to the nip portion. At the same time, a secondary transfer bias is applied to the transfer roller 25 from the power supply 29, the composite color toner image is transferred from the intermediate transfer member 20 to the recording medium 24, and the recording medium 24 is introduced into the fixing device 15 and 24
The above composite color toner image is heated and fixed, and becomes the final image. After the transfer of the composite color toner image onto the recording medium 24, the transfer residual toner on the surface of the intermediate transfer member 20 is removed by the cleaning device 35, and the intermediate transfer member 20 returns to the initial state and prepares for the next image formation. .

As shown in FIG. 3, a metal drum base (cylindrical core metal) 21 is provided on the drum-like intermediate transfer member 20 used in such an intermediate transfer type image forming apparatus.
0 made of conductive rubber or the like on the outer peripheral surface of the intermediate transfer member 20.
It is known that a resistance adjustment layer 220 for the purpose of resistance adjustment is laminated, and a surface layer 240 is formed on the outer peripheral surface of the resistance adjustment layer 220. Further, in order to improve the smoothness of the surface layer 240, The surface roughness adjusting layer 230 may be formed between the resistance adjusting layer 220 and the surface layer 240 in some cases.

[0013]

However, as described above, the resistance adjusting layer 22 is formed on the surface of the metal drum base 210.
0, the intermediate transfer member 20 formed by laminating the surface roughness adjusting layer 230 and the surface layer 240 needs to be laminated on the base 210 with the resistance adjusting layer 220, the surface roughness adjusting layer 230, and the surface layer 240. For this reason, the structure is complicated, and the number of manufacturing steps is increased, for example, after the flange 210a, the gear 210b, and the like for rotating the intermediate transfer member 20 must be formed separately and then fitted and fixed to the base 210. There is such a problem.

The present invention has been made in view of the above circumstances, and provides an intermediate transfer member capable of stably obtaining a good image over a long period of time with a simple structure, and an intermediate transfer device provided with the intermediate transfer member. The purpose is to provide.

[0015]

Means for Solving the Problems and Embodiments of the Invention The present inventor has conducted intensive studies to achieve the above object, and as a result, has been arranged between an image forming body and a recording medium, When the intermediate transfer member for temporarily transferring and holding the toner image formed on the surface to its own surface and transferring the toner image to the recording medium is formed by forming a surface layer on the outer peripheral surface of the cylindrical substrate, the above-described substrate is used. By containing a polyamide resin obtained from meta-xylylenediamine and adipic acid and / or a polyamide resin obtained from ε-caprolactam as a resin component, and by forming from a conductive resin composition containing a conductive agent, A resin pipe whose resistance has been adjusted in advance can be used as the base, and there is no need to separately provide a resistance adjustment layer, which is more intermediate than when the cylindrical base is formed from a metal such as aluminum. While simplifying the structure of the copy member, it found that it is possible to be able to obtain a good image stably for a long time, and completed the present invention.

Accordingly, the present invention has a cylindrical substrate and a surface layer formed on the outer peripheral surface of the cylindrical substrate, is disposed between the image forming body and the recording medium, and has a surface layer on the image forming body. In an intermediate transfer member for temporarily transferring and holding the formed toner image on its own surface and transferring the formed toner image to a recording medium, the base material is a polyamide resin and / or ε-caprolactam obtained from meta-xylylenediamine and adipic acid. The present invention provides an intermediate transfer member obtained by molding a conductive resin composition containing a polyamide resin obtained from the above as a resin component and a conductive agent.

According to the present invention, the toner image formed on the surface of the image forming body is temporarily transferred and held on its own surface, and the toner image is formed on the recording medium. An intermediate transfer device comprising: an intermediate transfer member for transferring; a driving member for circulating the intermediate transfer member; and voltage applying means for applying a voltage to the intermediate transfer member. And an intermediate transfer device using the intermediate transfer member formed by molding a conductive resin composition.

Hereinafter, the present invention will be described in more detail.
As shown in FIG. 2, the intermediate transfer member 20 of the present invention is configured by laminating a surface roughness adjusting layer 22 and a surface layer 23 on the outer peripheral surface of a pipe-shaped base 21. The above-mentioned substrate 21 was formed by molding a conductive resin composition containing a polyamide resin obtained from xylylenediamine and adipic acid and / or a polyamide resin obtained from ε-caprolactam as a resin component and containing a conductive agent.
Is formed.

The polyamide resin compounded as a resin component in the conductive resin composition is a polyamide resin produced by a polycondensation reaction between metaxylylenediamine and adipic acid as described above, and is generally called nylon MXD6. Things. Further, a polyamide resin obtained by subjecting ε-caprolactam to a ring-opening polymerization reaction is also suitably used, which is generally called nylon 6.

The conductive resin composition contains the specific polyamide resin (nylon MXD6 and / or nylon 6) as a resin component, and if necessary, the nylon MXD6 and / or nylon 6 and another resin may be mixed and used. In this case, any other resin may be used as long as it does not deviate from the object of the present invention, and it is not particularly limited, but nylon 11, nylon 12, nylon 46, nylon 6
6, Nylon 610, Nylon 612, Nylon 121
2, and other polyamide resins such as copolymers thereof are preferably used. When mixing these other resins, the mixing ratio is not particularly limited,
At least 10 to 90% by weight, especially 50 to 70% by weight, of the resin component constituting the composition is the above-mentioned nylon MXD6,
It is preferable to use nylon 6 or a mixture thereof.

The resin composition is imparted with conductivity by adding a conductive agent. In this case, the conductive agent may be any one which can be uniformly dispersed in the resin. Any of them may be used, and examples thereof include carbon black, graphite, metal powder such as aluminum, copper, and nickel, and conductive glass powder. Particularly, carbon black is preferably used. The amount of the conductive agent to be added is not particularly limited.
% By weight, particularly preferably 10 to 30% by weight,
Thereby, the volume resistivity of the molded product is preferably 1 × 10 ⁸ Ω · cm or less, particularly preferably 1 × 10 ⁶ Ω · cm or less.

Further, the above resin composition may be blended with an inorganic filler such as various fibers for the purpose of reinforcing or increasing the weight. As the inorganic filler, conductive fibers such as carbon fibers, conductive whiskers, and conductive glass fibers, and non-conductive fibers such as whiskers and glass fibers can be used. In this case, the conductive fiber can also act as a conductive agent, and by using the conductive fiber,
The amount of the conductive agent used can be reduced.

The compounding amount of these fillers is appropriately selected depending on the kind of the filler used, the length and the diameter of the fiber, etc., and is not particularly limited, but is usually 2 to 50% by weight of the composition. And more preferably about 5 to 30% by weight, and still more preferably about 10 to 20% by weight. By adding such a filler, the strength and rigidity of the molded article can be reduced without lowering the surface smoothness. Can be improved.

The conductive resin composition may contain, if necessary, polytetrafluoroethylene (PTFE), silicone, molybdenum disulfide (MoS ₂ ), various metal soaps, etc., in addition to the above-mentioned conductive agent and filler. Can be added in an appropriate amount. The filler may be subjected to a surface treatment using a commonly used silane coupling agent or titanate coupling agent.

The method of molding the cylindrical substrate using the conductive resin composition is not particularly limited, but preferably employs an injection molding method. The molding conditions such as molding temperature and injection pressure are made of nylon M
Ordinary conditions when XD6 and / or nylon 6 are used can be used.

Although the outer peripheral surface of the cylindrical substrate 21 is not particularly limited, its surface roughness is 0.8 μm or less, particularly 0.1 μm or less, as a center line average roughness Ra, and the maximum height Rmax is not more than 0.1 μm. It is preferably 1.5 μm or less, particularly 1 μm or less, and 2 μm or less, particularly 1 μm or less in 10-point average roughness Rz. In this case, the polyamide resin obtained from meta-xylylenediamine and adipic acid and / or ε
-By using a conductive resin composition containing a polyamide resin obtained from caprolactam, even when an inorganic filler for reinforcement is added, such surface roughness can be easily achieved.

As shown in FIG. 2, the intermediate transfer member 20 is formed by laminating a surface roughness adjusting layer 22 and a surface layer 23 on a cylindrical substrate 21. 21 is formed of the conductive resin composition. In this case, by adding the reinforcing inorganic filler to the conductive resin composition, a molded article having excellent strength and rigidity can be obtained. Therefore, as shown in FIG. Flange 21 on at least one end face of
a and the drive gear 21b can be integrally formed of the conductive resin composition.

As the binder component forming the surface layer 22, a known rubber or resin used as a binder component forming the surface layer of the intermediate transfer member can be used, and is not particularly limited. One or more mixed resins selected from a modified acrylic resin, a polyurethane resin, an acrylic resin, and a polyamide resin are preferably used.

The binder may be polytetrafluoroethylene, tetrafluoroethylene-perfluoroalkylvinyl ether copolymer, tetrafluoroethylene-hexafluoropropylene-perfluoro, for the purpose of improving low friction and toner adhesion. One or a mixed resin of two or more fluororesins selected from an alkyl vinyl ether copolymer, polychlorotrifluoroethylene, polyfluoride, and polyvinyl fluoride is added.

The amount of the fluororesin to be added is not particularly limited, but is preferably 2 to 50 parts by weight, particularly preferably 10 to 30 parts by weight, based on 100 parts by weight of the binder resin.

The surface layer 23 may contain the above-mentioned binder and the above-mentioned fluororesin, if necessary, for the purpose of improving smoothness, film formability and water resistance as long as the object of the present invention is not deviated. In addition, other resins can be further compounded. The other resin is not particularly limited, and examples thereof include a polyvinyl acetal resin, a polyester resin, an epoxy resin, a butyral resin, a phenol resin, and a vinylidene chloride-based copolymer.

Further, a conductive agent can be added to the surface layer 23 as needed to impart or adjust conductivity. There is no particular limitation on the conductive agent, and various electronic conductive agents such as carbon black and various ionic conductive agents can be used.

The amount of the conductive agent can be appropriately adjusted so as to obtain a desired resistance. In this case, the resistance of the surface layer is preferably set to a volume resistivity of 10 ³ to 10 ¹² Ω · cm, particularly preferably 10 ⁵ to 10 ¹⁰ Ω · cm. The amount added can be adjusted.

Further, a crosslinking agent, a thickener, a thixotropic agent, a structural viscosity imparting agent, and the like can be added to the surface layer 23 as necessary. In this case, as the cross-linking agent, any one can be used as long as it can exhibit a desired cross-linking effect depending on the resin used, for example, epoxy-based, oxazoline-based, melamine-based, isocyanate-based,
Phenol-based cross-linking agents are exemplified, and isocyanate-based cross-linking agents are particularly preferably used. Usually, the amount of the crosslinking agent is preferably about 0.5 to 20 parts by weight based on 100 parts by weight of the resin. The thickener, the thixotropy-imparting agent, the structural viscosity-imparting agent and the like can be appropriately used regardless of inorganic or organic. Further, additives such as silica, boron nitride, and molybdenum sulfide can be added as needed.

The thickness of the surface layer is set according to the form of the intermediate transfer member and is not particularly limited.
Usually, it can be 1 to 15 μm, especially 3 to 5 μm,
If it is less than 1 μm, the durability may be poor.
If it exceeds μm, good surface properties may not be obtained.

Next, the surface roughness adjusting layer 22 is a layer arbitrarily formed to smooth the surface of the substrate 21 to some extent and to improve the smoothness of the surface of the intermediate transfer member 20. If the surface roughness is appropriate, it may be omitted. This surface roughness adjusting layer 22
A coating film formed by using an organic solvent-based or water-based resin, but in particular, a film formed by forming a film, having few occurrences of cracks and cracks when the coating film is dried, and further having a cylindrical shape such as swelling the cylindrical substrate 21. It is preferable to use a water-based resin as a main material because the influence on the base 21 is small. The water-based resin is not particularly limited as long as it can surely form a coating film on the cylindrical substrate 21, but is not particularly limited. In particular, polyvinyl acetal resin, vinylidene chloride resin, urethane Resin, acrylic resin, polyester resin and the like are preferably used.

A crosslinking agent for crosslinking the aqueous resin can be added to the surface roughness adjusting layer 22. The cross-linking agent is appropriately selected depending on the type of the aqueous resin used, and may be any as long as a desired cross-linking effect can be obtained. Phenol-based crosslinking agents are preferably used. The amount of the crosslinking agent added is usually 0.5 to 100 parts by weight of the crosslinking target resin.
Although it is in the range of 50 to 50 parts by weight, a cross-linking agent exceeding 50 parts by weight may be added without departing from the purpose of adjusting the surface roughness.

The surface roughness adjusting layer 22 can be added or adjusted to have conductivity by adding a conductive agent, and usually has a volume resistivity of 1 × 10 ³ to 1 × 10 ¹² Ω · cm. It is particularly preferable to adjust the resistance value so as to be 1 × 10 ⁵ to 1 × 10 ¹⁰ Ω · cm. In this case, it is preferable to use a carbon or ionic one as the conductive agent. The amount of the conductive agent is appropriately adjusted so as to obtain the above-mentioned volume resistivity according to the type of the conductive agent and the like, and is not particularly limited. It is about 50% by weight, especially about 5 to 15% by weight.

The surface roughness adjusting layer 22 is preferably formed using an aqueous resin as described above.
A resin other than the aqueous resin may be contained, and a plurality of the surface roughness adjusting layers 22 may be formed as necessary. Further, the surface roughness adjusting layer 22
Although the thickness of is not particularly limited, it is usually 1 to 8
When the thickness is less than 1 μm, a sufficient effect of adjusting the surface roughness may not be obtained. On the other hand, when the thickness exceeds 800 μm,
In some cases, the thickness of the cylindrical substrate is relatively thin, so that the hardness of the intermediate transfer member is increased or the cost is increased.

The surface layer 23 and the surface roughness adjusting layer 2
The method for forming 2 is not particularly limited, and a known dipping method, spraying method, extrusion molding method, or the like can be employed.However, usually, a coating material in which each component is dissolved or dispersed in a solvent is prepared and the dipping method is used. A method of forming a coating film is preferably used.

In the intermediate transfer member 20 of the present invention, if the surface of the surface layer 23, that is, the surface of the intermediate transfer member 20 has irregularities, the toner may be clogged in the irregularities and cause an image defect. The surface is preferably as smooth as possible, and is not particularly limited. However, the surface roughness of the surface layer 23, that is, the surface roughness of the intermediate transfer member is determined by JI
S10 point average roughness Rz is 4 μm or less, particularly 3 μm or less,
More preferably, it is 2 μm or less. in this case,
By providing the surface roughness adjusting layer 22, such good smoothness can be easily obtained.

The image forming apparatus using the intermediate transfer member of the present invention is not limited to the apparatus shown in FIG.
The intermediate transfer member of the present invention may be provided as long as the intermediate transfer member is disposed between the image forming body and the recording medium, the toner image on the image forming body is once transferred and held, and the toner image is transferred to the recording medium. It can be changed appropriately within the scope of the gist.

[0043]

According to the intermediate transfer member of the present invention, a good image can be stably obtained over a long period of time with a simple structure.

[0044]

EXAMPLES Hereinafter, the present invention will be described specifically with reference to Examples and Comparative Examples, but the present invention is not limited to the following Examples.

Example 1 Surface Roughness on Outer Surface of Cylindrical Substrate
Adjustment layer and surface layer are formed sequentially, length 250mm, inner diameter
Create an intermediate transfer member of 150mm and 156mm outside diameter
Was. This intermediate transfer member is formed by injecting the following conductive resin composition.
Molded to have a volume resistance of 1 × 10⁶Ω · cm cylindrical base
A body is formed, and the following surface roughness is applied to the outer peripheral surface of the cylindrical substrate.
Adjusting paint is applied by dipping method and thickness is about 100
μm, volume resistance value is 1 × 10⁸Ω · cm surface roughness adjustment
Forming a layer, further on the outer peripheral surface of the surface roughness adjusting layer,
The surface layer paint 1 is applied by a dipping method to a thickness of about 2
0 μm, volume resistance value is 1 × 10 ⁸Form a surface layer of Ωcm
It has been achieved.

Conductive Resin Composition Nylon 6 100 phr Acetylene Black 25 phr Conductive Whiskers 20 phr Coating for Surface Roughness Adjustment Polyurethane 100 phr Isocyanate 5 phr Ion Conductive Agent 10 phr Surface Layer Coating 1 Acrylic Urethane 100 phr Isocyanate 5 phr FFF Carbon 15 phr

Example 2 A surface layer was formed on the outer peripheral surface of a cylindrical substrate, and the length was 250 mm, the inner diameter was 150 mm, and the outer diameter was 156.
mm intermediate transfer member was prepared. This intermediate transfer member is
The above conductive resin composition is injection-molded to have a volume resistance of 1
A cylindrical substrate of × 10 ⁶ Ω · cm is formed, and the following surface layer paint 2 is applied on the outer peripheral surface of the cylindrical substrate by a dipping method to have a thickness of about 30 μm and a volume resistance value of 1 × 10 ^8. Ω
· A surface layer of cm is formed.

Surface layer paint 2 Acrylic urethane 100 phr Fluoroolefin-modified copolymer 5 phr Isocyanate 5 phr Ionic conductive agent 10 phr

Comparative Example 1 An intermediate transfer member having a length of 250 mm, an inner diameter of 150 mm, and an outer diameter of 156 mm was formed by sequentially forming a surface roughness adjusting layer and a surface layer on the outer peripheral surface of a cylindrical substrate. This intermediate transfer member has a surface roughness of about 100 μm in thickness and a volume resistivity of 1 × 10 ⁸ Ω · cm, which is obtained by coating the outer peripheral surface of an aluminum pipe with carbon black added to polyurethane by a dipping method. An adjusting layer is formed, and an outer peripheral surface of the surface roughness adjusting layer is coated with acrylic urethane to which carbon black is added by a dipping method, and is coated with a thickness of about 20 μm and has a volume resistance of 1 × 10
A surface layer of ⁸ Ω · cm was formed.

[Comparative Example 2] A surface layer was formed on the outer peripheral surface of a cylindrical substrate, and the length was 250 mm, the inner diameter was 150 mm, and the outer diameter was 156.
mm intermediate transfer member was prepared. This intermediate transfer member is
A surface layer having a thickness of about 30 μm and a volume resistivity of 1 × 10 ⁸ Ω · cm is formed on the outer peripheral surface of an aluminum pipe by applying a fluoroolefin-modified copolymer obtained by adding carbon black to a fluoroolefin-modified copolymer by a dipping method. It was done.

The following transfer test was performed on the intermediate transfer member. Table 1 shows the results.

Transfer Test Each of the above-mentioned intermediate transfer members was mounted on a color printer having the same configuration as that of the image forming apparatus illustrated in FIG. 1, and a halftone image was evaluated. Withstand voltage test Each intermediate transfer member is pressed against a metal flat plate by applying a load of its own weight + 1 kg, and voltage is applied with the base portion applied and the metal flat plate grounded. Leakage (abnormal discharge) or dielectric breakdown occurs up to 1 kV. It was tested to see if it happened. Coating Film Adhesion Test The surface layer after coating was visually evaluated using a 10-fold magnifier to check for peeling.

[0053]

[Table 1] As shown in Table 1, it was confirmed that the intermediate transfer members of Examples 1 and 2 according to the present invention had good transfer performance and could stably transfer a good image to a recording medium. On the other hand, in the case of the intermediate transfer member of the comparative example, transfer unevenness was observed, and a good image could not be transferred to the recording medium in some cases.

In the intermediate transfer members of Examples 1 and 2 according to the present invention, the withstand voltage performance was 1 kV and no leakage was observed, whereas in the case of the intermediate transfer member of the comparative example,
Leakage was observed at 0.5 kV, and it was recognized that the intermediate transfer members of Examples 1 and 2 could withstand higher voltages than the intermediate transfer members of Comparative Examples.

Furthermore, the intermediate transfer members (intermediate transfer drums) of Examples 1 and 2 according to the present invention had high adhesion to the coating film and no peeling of the coating film was observed, whereas the intermediate transfer members of Comparative Examples In the case of the member, peeling was observed at the end or the entire surface.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating an example of an image forming apparatus using an intermediate transfer method.

2A and 2B show a drum-shaped intermediate transfer member according to one embodiment of the present invention, wherein FIG. 2A is a schematic cross-sectional view, and FIG. 2B is a schematic cross-sectional view taken along line AA of FIG. is there.

FIG. 3 is a schematic sectional view of a conventional intermediate transfer member.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 photoconductor 2 primary charger 3 image exposure 9 paper feed cassette 14 cleaning device 15 fixing device 20 intermediate transfer member 21 substrate 22 surface roughness adjusting layer 23 surface layer 24 recording medium 25 transfer roller 29 bias power supply 35 cleaning of intermediate transfer member Apparatus 41 Magenta developing apparatus 42 Cyan developing apparatus 43 Yellow developing apparatus 44 Black developing apparatus 61 Bias power supply 210 Base 220 Resistance adjusting layer 230 Surface roughness adjusting layer 240 Surface layer

Continued from the front page F-term (reference) 2H200 FA02 FA13 GA23 GA50 HA02 HA12 HA28 HB02 HB12 JA02 JA05 JC02 JC10 JC13 JC15 JC16 JC17 LA29 LC10 MA04 MA11 MA12 MA14 MA17 MA20 MB04 MC06 4F071 AA54 AB01 AB03 AB07 AB15 AB09 AB28 A BB05 BC05 BC16 4J002 CL001 CL011 CL031 DA006 DA026 DA036 DA076 DA086 DA096 DL006 FD017 FD116 GQ00 GQ02

Claims (9)

[Claims] 1. A toner having a cylindrical substrate and a surface layer formed on the outer peripheral surface of the cylindrical substrate, disposed between an image forming body and a recording medium, and formed on the surface of the image forming body. An intermediate transfer member for temporarily transferring and holding an image on its own surface and transferring the image to a recording medium, wherein the substrate is a polyamide resin obtained from meta-xylylenediamine and adipic acid and / or a polyamide obtained from ε-caprolactam An intermediate transfer member formed by molding a conductive resin composition containing a resin as a resin component and a conductive agent. 2. The intermediate transfer member according to claim 1, wherein at least one of a flange and a driving gear is integrally formed on at least one end surface of the base. 3. The intermediate transfer member according to claim 1, wherein carbon black is contained as a conductive agent. 4. The intermediate transfer member according to claim 3, wherein the content of carbon black is 2 to 80% by weight. 5. The intermediate transfer member according to claim 1, wherein the reinforcing inorganic filler is mixed and dispersed at a ratio of 2 to 50% by weight. 6. The intermediate transfer member according to claim 1, wherein a surface roughness adjusting layer for improving smoothness of the surface layer is formed between the substrate and the surface layer. . 7. The method according to claim 1, wherein the surface layer comprises a binder component composed of one or more mixed resins selected from urethane-modified acrylic resins, polyurethane resins, acrylic resins, and polyamide resins. One or more fluororesins selected from perfluoroalkyl vinyl ether copolymer, tetrafluoroethylene-hexafluoropropylene-perfluoroalkyl vinyl ether copolymer, polychlorotrifluoroethylene, polyfluoride, polyvinylfluoride The intermediate transfer member according to any one of claims 1 to 6, wherein the intermediate transfer member is formed by adding a mixed resin. 8. The intermediate transfer member according to claim 6, wherein the surface roughness adjusting layer is formed by adding a crosslinking agent and a conductive agent to an organic solvent-based resin or an aqueous resin. 9. Intermediate transfer disposed between an image forming body and a recording medium, temporarily transferring and holding the toner image formed on the surface of the image forming body to its own surface, and transferring this to a recording medium. 9. An intermediate transfer device comprising: a member; a driving member for circulating the intermediate transfer member; and a voltage applying unit for applying a voltage to the intermediate transfer member. An intermediate transfer device using the intermediate transfer member according to claim 1.