JP6500361B2 - Semiconductive resin material, semiconductive intermediate transfer belt and image forming apparatus - Google Patents

Description

  The present invention relates to a semiconductive resin material, a semiconductive intermediate transfer belt, and an image forming apparatus using the same.

  In an electrophotographic apparatus, a developed toner image is temporarily intermediately transferred to a belt-like intermediate transfer medium and then secondarily transferred to a final transfer medium such as paper, especially in a recent full color electrophotographic apparatus. An intermediate transfer belt method is used in which developed images of four colors of yellow, magenta, cyan, and black are once superimposed on an intermediate transfer medium and then collectively transferred to a final transfer medium such as paper. . Therefore, the electrophotographic apparatus is capable of full color copying and black monochrome copying, and is required to be able to use a final transfer medium such as various types of paper having different thicknesses, sizes, materials and electrostatic characteristics. Ru.

  A thermoplastic resin and a thermosetting resin are used as a resin material constituting an intermediate transfer belt for such an electrophotographic apparatus, and carbon black is generally used to relieve high insulation caused by the resin material. In addition, conductive fine particles such as metal fine particles, ionic conductive agents such as hydrocarbon group-containing ammonium salts, resistance regulators such as polymers having a hydrophilic segment are added. In addition, as a method of producing an intermediate transfer belt, it is possible to continuously produce, to reduce the environmental load at the time of production, to facilitate recycling, etc., and to extrude a thermoplastic resin whose environmental load is smaller than that of thermosetting resin. There is known a technology for processing into a conductive endless belt (refer to JP2009-25625A, JP2007-65587A, JP3821600, JP2008-239947).

However, when the conductivity is adjusted with the electron conductive particles and the conductive agent using such a method, a sensor for detecting mechanical characteristics of the resin and, in the case of use in a printer device, the amount of toner adhering to the belt surface There is also a problem that the glossiness of the belt surface, which is a necessary characteristic, is reduced when using.
In order to stabilize the electrical properties, the amount of heat input and shear energy should be increased to increase the amount of conductive material added to the thermoplastic resin that is the base material of the raw material compound, or to improve the dispersibility. In order to uniformly and finely disperse a conductive material such as carbon black, it is conceivable to add a large amount of heat and shear energy.
When the addition amount of the conductive agent is increased, the fine particles and the conductive resin are unevenly distributed on the belt surface to increase the surface roughness to reduce the gloss, or to lower the crystallinity of the base resin to reduce the tensile strength. Do. Further, in the method of improving the dispersion state of the conductive agent in the base resin, the polymer chains of the thermoplastic resin may be cut, or the conductive fine particles may penetrate to the crystal region, and the elastic modulus of the semiconductive material or In order to cause a drop in Tg, there is a problem that when it is actually incorporated into a printer and used, it causes quality problems due to belt elongation.

  In order to solve the problem, in an endless intermediate transfer belt containing a thermoplastic resin, a conductive resin and a conductive inorganic particle, a sea-island structure in which the thermoplastic resin forms a continuous phase and the conductive resin forms a discontinuous phase. , And the cross-sectional shape of the conductive resin in a cross-section in the direction perpendicular to the endless direction is elliptical, and the major axis is a, the minor axis is b, b is 0.5 to 5 μm, and 1 ≦ a / b. We are the first technology for obtaining a belt with a ratio c of the cross-sectional area of the conductive resin to the cross-sectional area in the direction perpendicular to the endless direction of the endless intermediate transfer belt: 1 ≦ c ≦ 20% (See Japanese Patent Application No. 2013-02685).

  In this method, a conductive resin having an SP value difference of 2.5 or more is dispersed in an insulating base resin to form a sea-island structure, and a conductive path is formed between the islands. Carbon black of conductive particles having a primary particle size of 50 to 300 nm is dispersed in an aggregated state for the purpose of producing. When controlling the electrical resistance value in this method, by raising the belt molding temperature, the base resin viscosity of the belt raw material compound is reduced, and the aggregation of the conductive particles dispersed in the compound is promoted. The conductivity was improved to control the belt resistance value to a desired value (see FIG. 2).

However, in such a method, a slight change in mold temperature causes a change in the aggregation state of carbon black to cause a large difference in the resistance value, so that the desired resistance value is obtained and the resistance variation in the belt surface is small. In the course of the study of the present invention, it has been found that there is a problem that it is difficult to obtain a high belt.
Since carbon black has a small primary particle size of 50 to 300 nm, when the size of the aggregation state and the degree of crystallinity of the base resin are high due to the temperature and shear state at the time of molding, islands consisting of conductive resin instead of base resin It is considered to be easily incorporated into a part, and to be easily present in a base resin when the degree of crystallinity is low.
Therefore, conventionally, in a conductive belt containing a thermoplastic resin and a conductive material, the gradient of the belt resistance fluctuation due to the molding temperature is smaller and the surface resistance deviation is smaller than that, and the voltage dependence (electrical characteristics) and the belt elongation, creep, etc. The material formulation and molding method for obtaining a belt satisfying simultaneously the quality problem (mechanical characteristics) and the gloss have not been clarified yet.

  The present invention solves the problems of the prior art and contains a thermoplastic resin, a conductive resin, and conductive inorganic particles, and when used as an intermediate transfer belt, has a required semiconductivity and a voltage of resistance value. Semi-conductive resin composition that has low dependence (electrical characteristics), small difference in electrical characteristics in the belt surface, and compatibility with quality issues (mechanical characteristics) due to belt elongation etc., and belt surface properties (glossiness) It aims to provide goods.

The said subject is solved by the "semiconductive resin composition" of following (1) description of this invention.
(1) “Characterized by containing non-conductive resin, conductive resin and conductive inorganic particles, the conductive particles are conductive glass, and the content thereof is 0.01 wt% to 5.0 wt% Semiconductive resin composition to be

  As understood from the detailed description below, according to the present invention, the problems of the prior art are solved, and it contains a thermoplastic resin, a conductive resin and a conductive inorganic particle, and exhibits semiconductivity. When this is used as an intermediate transfer belt, it has appropriate semiconductivity required for the intermediate transfer belt, the voltage dependency (electrical characteristics) of the resistance value is small, and the difference in the electrical characteristics in the belt surface is small, and the belt elongation An excellent effect of providing a semiconductive resin composition characterized in that the compatibility of quality problems (mechanical characteristics) and belt surface properties (glossiness) due to etc. is ensured is exhibited.

It is a figure explaining the cross section of one example of the intermediate transfer belt using the semiconductive resin composition of this invention. FIG. 7 is a view for explaining a cross section of an example of a conventional intermediate transfer belt. It is a schematic block diagram which shows an example of the image forming apparatus 500 of this invention. It is a block diagram which shows schematic structure of one of the four imaging units 1 of FIG.

Hereinafter, the present invention will be described in detail.
The present invention relates to the "semiconductive resin composition" described in the above (1), but the "semiconductive resin composition" described in the following (2) to (8), "image forming apparatus And “the manufacturing method of the transfer belt”, these will also be described in detail.
(2) The semiconductive resin composition according to (1), wherein the conductive glass is a vanadate having an average primary particle diameter D1 of 0.5 μm to 5 μm.
(3) “The conductive resin is in a microphase separation state in which the island portion of the sea-island structure is formed in the nonconductive resin, and the size D2 of the domain of the island portion of the conductive resin and the conductive glass The semiconductive resin composition according to (1) or (2), wherein the particle diameter D1 is in the relationship of D1> D2.
(4) “The nonconductive resin is a thermoplastic crystalline resin, polyethylene, homopolymer and / or copolymer of polypropylene, homopolymer of vinylidene fluoride and / or copolymer of vinylidene fluoride, polyethylene-tetrafluoroethylene resin (ETFE), vinylidene fluoride-tetrafluoroethylene copolymer resin (PVDF-ETFE), polychlorotrifluoroethylene (PCTFE), tetrafluoroethylene-hexafluoropropylene copolymer (FEP) and tetrafluoroethylene perfluoro It is 1 type or multiple types of resin chosen from an alkyl vinyl ether copolymer (PFA), The semiconductive resin composition as described in any one of said (1) thru | or (3) characterized by the above-mentioned.
(5) “The conductive resin is a polymer having a polyether unit, and the non-conductive resin has a difference in SP value of 2.5 or more, any of the above (1) to (4) The semiconductive resin composition according to 1 or 2.
(6) “at least an electrostatic latent image forming unit for forming an electrostatic latent image on an image carrier, and a toner image on the electrostatic latent image formed on the image carrier using a toner Means, a primary transfer means for transferring the toner image on the image carrier onto the intermediate transfer belt, a secondary transfer means for transferring the toner image on the intermediate transfer belt onto the recording medium, and a toner on the recording medium An intermediate transfer belt for use in an image forming apparatus comprising fixing means for fixing an image, wherein the intermediate transfer belt comprises the semiconductive composition according to any one of the above (1) to (5) An image forming apparatus characterized by being an intermediate transfer belt used.
(7) At least the electrostatic latent image forming means for forming the electrostatic latent image on the image carrier, and developing the toner image on the electrostatic latent image formed on the image carrier using the toner A transfer belt for conveying the recording medium to transfer the toner image on the image carrier onto the recording medium, a transfer means for transferring the toner image on the image carrier onto the recording medium, A transfer belt for use in an image forming apparatus, comprising: fixing means for fixing a toner image on a recording medium, the transfer belt comprising the semiconductive material according to any one of (1) to (5). Image forming apparatus characterized by being a transfer belt using an ink composition.
(8) “Semiconductive containing a nonconductive resin, a conductive resin and conductive inorganic particles, wherein the conductive particles are conductive glass, and the content thereof is 0.01 wt% to 5.0 wt% A method of producing a transfer belt comprising the steps of melt-kneading a resin composition to obtain a melt-kneaded product, and extruding the melt-kneaded product to obtain a molded product.

First, the main differences of the present invention compared to the known art and the prior art, and the differences in function and function due to the differences will be described.
In the system according to the known art and the prior art and the present invention, a conductive resin having an SP value difference of 2.5 or more to that of the base resin is added to the insulating nonconductive resin (belt base resin). The nonconductive resin and the conductive resin are in a microphase separation state as shown in FIG. 2 to form a sea-island structure.
However, in the prior art and in the prior art, the dispersed state of carbon black having a primary particle size of 50 to 300 nm (the particle size of the aggregate is considered to be approximately 80 nm to 1000 nm) added for the purpose of creating conductive paths The aggregation state was controlled by the shear rate when the temperature and the heating and kneading time. Therefore, since the belt conductivity is determined by the aggregation state of carbon black existing between islands of the sea-island structure formed of the conductive resin in the base resin, the carbon may be carbon even with a slight difference in molding temperature and shear rate. The black particles moved, and a large difference in belt resistance was likely to occur.
In the present specification, the term "semiconductive" refers to the conductivity (reciprocal number of resistivity) between non-conductivity and conductivity, and specifically, the resistivity is 10 ^-10 ohm ^-1 cm ^-1. -10 ^-1 ohm ^-1 cm ^-1 is meant. There is almost no difference from the range that has long been generally mentioned (for example, Takeo Kawaguchi “Semiconductor Chemistry” (December 25, 1979, Maruzen Co., Ltd., page 4)).

  On the other hand, in the present invention, the conductive glass is preferably dispersed in the form of average primary particles, and these particles can be adjusted in the base resin as shown in FIG. A stable conductive path can be formed between islands of a sea-island structure made of a conductive resin. Therefore, it seems that resistance variation due to slight change in temperature and shear rate at the time of molding which has been a problem in the past is reduced.

In addition, since the conductive glass has a sufficiently low resistance value of 30 to 130 Ωcm, the desired conductivity is secured with a smaller amount of addition and a lower shear rate than when carbon black is added as conventional conductive fine particles. It becomes possible. As a result, it has desired electrical characteristics, a small difference in the electrical characteristics in the belt surface, and a sufficient glossiness due to a better surface property, and a tensile property and the like because the crystallinity of the base resin is not significantly reduced. A belt with good mechanical properties can be obtained.
If the amount of conductive glass added is too low, the resistance value is too high to obtain desired electrical characteristics. On the other hand, if it is too large, the resistance value is too low to obtain the desired electrical properties, and the gloss and mechanical properties are adversely affected.

First, the conductive glass in the present invention will be described. There are two types of conductive glass particles (powder): glass with a transparent conductive film attached to the surface of ordinary glass particles, and glass with glass material having electrical conductivity. These can be roughly classified, but both can be used in the present invention. The former is a glass particle surface coated with a thin film of In ₂ O ₃ + SnO ₂ or SnO ₂ + Sb ₂ O ₃ or the like, and such conductive film forming glass is typically a plate-like structure. In particular, transparent electrodes widely used for liquid crystal display panels and the like are well known.
On the other hand, it is also possible to use glass particles (powder) in which the glass itself has conductivity, and as such a material, in particular, AgI- called ion conductive glass because it exhibits conductivity by migration of Ag + ions in the material. Ag ₂ O-based ones are well known. This electrical conductivity reaches about 2 * 10 ^<-2> S * cm ^{< -1 > at} the maximum to glass being about 10 ^{< -13>} .
Moreover, the fine powder of the electroconductive glass which has the vanadium shown by Unexamined-Japanese-Patent No. 2003-34548 and Unexamined-Japanese-Patent No. 2012-25641, and vanadate glass can be used.
The conductive glass powder may have any particle shape, but it is long and narrow with a long axis direction and a short axis direction, for example, needle-like, short fiber-like, strip-like, ellipsoidal or sintered body More preferably, they are in the form of amorphous (amorphous), or a mixture thereof. Moreover, as a size, it is preferable that average primary particle diameter D1 is 0.5 micrometer-5 micrometers.
Among these conductive glasses, vanadate glass powder can be particularly preferably used in the present invention.

Next, the conductive resin will be described. As the conductive resin, a conjugated polymer includes a polymer material having conjugation. Conjugated polymers differ from general polymers in that conjugated polymers have a conductive path, but they do not exhibit conductivity by themselves because there is no charge carrier that can move freely, that is, no carrier. However, conductivity can be expressed by doping carriers and injecting freely movable carriers like an inorganic semiconductor such as silicon. This doping is performed by adding an appropriate chemical species such as an electron acceptor (acceptor) such as iodine or arsenic pentafluoride or an electron donor (donor) such as an alkali metal to the polymer, which is called chemical doping. . Thus, the conductive polymer has high conductivity because chemical doping produces a carrier that can move freely.
A polythiophene system having a structure in which double bonds and single bonds are alternately arranged, that is, a main chain with developed π conjugation, an organic substance having conductivity comparable to that of metal but having conductivity comparable to metal but having conductivity comparable to metal The following are well known: polyacetylenes, polyparaphenylenes, polyparaphenylenevinylenes, polyanilines and polypyrroles. These can also be used in the present invention. However, they are very expensive, and polythiophenes have difficulty in decomposition products, polyacetylenes and polyanilines lack stability, and polypyrroles are not transparent. Each has its own unique characteristics.

Therefore, polyether ester amide elastomers having a property of being hardly compatible with thermoplastic resin materials described in JP-A-61-73753, JP-A-61-73765, and JP-A-61-246244, Polymeric antistatic agent described in JP-A-157682, fluoroalkylether group-containing polymeric antistatic agent having a hydrogen atom at the end described in JP-A-2002-88246, and poly described in JP-A-2007-39658. Ester group-containing polymer antistatic agent (A) comprising an ether chain-containing block polymer (A1), an anionic group-containing block polymer (A2) and a cationic group-containing block polymer (A3) A molecular permanent antistatic agent can be preferably used. The polyether unit can function as a charge carrier because it is rare and ionic as a resin material.
Further, one having a volume specific resistance value of 1 × 10 ⁶ to 1 × 10 ¹¹ Ωcm is more preferable.
As commercially available products, Pellestat 230, Pellestat 201, Pellestat 303, Pelestat 300, Pellestat VH 230, Pellestat 212 (above, Sanyo Chemical Industries, Ltd.) manufactured by Sanyo Chemical Industries, Ltd., Irgastat (Ciba Specialty Chemicals Co., Ltd.) Companies), ENTIRA · AS series (Mitsui-Dupont Polychemicals Co., Ltd.), Irgastat P (Ciba Specialty Chemicals), Pebax (France, Atofina) and the like.

  The size and shape of the conductive resin in the present invention may be any shape, but the microphase separation state in which the island portion of the sea-island structure is formed in the nonconductive resin as described with reference to FIG. In order to simply and surely present, it is more preferable that the size D2 of the domain of the island portion of the conductive resin and the particle diameter D1 of the conductive glass have a relation of D1> D2. The shape may be any as in the case of the conductive glass powder, but it may be elongated in the long and short axis directions, for example, needle-like, short fiber-like, strip-like, ellipsoidal or It is more preferable that it is a sinter (amorphous shape) thing, or those mixtures.

  Furthermore, regarding the conductive resin, the non-conductive resin as the belt base material in the present invention may be any as long as it can form a continuous phase corresponding to the sea portion of the sea-island. For example, a polycarbonate resin, an amorphous polyester containing an aromatic site, a polyimide derived from polyamic acid, and a thermoplastic resin partially partially structured by partially using a trifunctional monomer. Alternatively, it may be a relatively hard one such as a thermoplastic resin having a structure partially cross-linked by a cross-linking agent. Among them, thermoplastic resins can be preferably used, and among these, thermoplastic crystalline resins can be more preferably used.

Specifically, polyethylene, homopolymer and / or copolymer of polypropylene, homopolymer of vinylidene fluoride and / or vinylidene fluoride copolymer, polyethylene-tetrafluoroethylene resin (ETFE), vinylidene fluoride-tetrafluoroethylene copolymer Coalescing resin (PVDF-ETFE), polychlorotrifluoroethylene (PCTFE), tetrafluoroethylene-hexafluoropropylene copolymer (FEP) , tetrafluoroethylene perfluoroalkyl vinyl ether copolymer (PFA) and polymethacrylstyrene be able to.
These can be used alone or as a mixture of two or more resins capable of forming a continuous phase.

Furthermore, when a cross section of the belt or the semiconductive resin composition of the present invention in the direction perpendicular to the endless direction is observed, the conductive resin and the nonconductive resin have a difference in SP value of 2.5 or more. preferable.
As described above including FIG. 1, the intermediate transfer belt having the sea-island structure in which the conductive thermoplastic resin forms the continuous phase and the conductive resin forms the discontinuous phase can be obtained more simply and reliably. .

[Manufacturing method of transfer belt]
The manufacturing method of the transfer belt of the present invention contains a nonconductive resin, a conductive resin and a conductive inorganic particle, the conductive particle is a conductive glass, and the content thereof is 0.01 wt% to 5.0 wt% And melt-kneading to obtain a melt-kneaded product, and extruding the melt-kneaded product to obtain a molded product.
As the nonconductive resin, it is preferable to use a thermoplastic resin, but as long as flexibility and flexibility as a transfer belt are ensured, it becomes partially or almost curable after being formed on the transfer belt It may be
The production process typically involves melt-kneading a thermoplastic resin, a conductive resin and a conductive inorganic particle, and optionally or as required, other components such as carbon black of the conductive inorganic particle, etc. In the continuous phase of the thermoplastic resin component, the conductive resin and the conductive glass form a kneaded product dispersed in the form as described above, and this is extruded and molded into the following belt shape Although it is advantageous to make the resin pellet easy to carry out, this pelletizing step is not necessarily essential in the present invention.
And then, the belt of the present invention can be extruded from the pellets placed in the raw material feed hopper, usually using a twin-screw extruder.

However, instead, a conductive resin free from thermoplastic resin and conductive inorganic particles, and optionally, if necessary or other components such as carbon black of the conductive inorganic particles, are melt-kneaded and formed When pellets are used to form a belt by a twin-screw extrusion molding apparatus, the pellets containing no conductive resin and no conductive resin are melt-kneaded using the melt-kneading function of the twin-screw extrusion molding apparatus. It can be extruded into the inventive belt.
Separately, pellets formed by melting and kneading conductive inorganic particles in a thermoplastic resin and pellets formed by melting and kneading conductive inorganic particles such as carbon black in a thermoplastic resin are separately prepared. When forming into a belt with the following twin-screw extruder, melt-kneading both pellets together using the melt-kneading function of the twin-screw extruder and extruding into the belt of the present invention You can also. Since the conductive resin and carbon black or the like (conductive inorganic particles) may differ in dispersibility with respect to the thermoplastic resin, the desired degree of kneading (temperature of heating, kneading time, etc.) when producing the respective pellets is Of course it can be different. In fact, for example, carbon black fine particles are usually present in the form of secondary aggregates in many cases, but in order to well disperse them in the resin, the melting temperature of the thermoplastic resin is raised excessively and the resin viscosity is not lowered. As described above, it is possible that the secondary aggregate tightly contained in the resin is caused to accompany and forcibly deform by curving and holding a little hard and repeatedly stretching and folding it by force. Are often preferred.

[Image forming apparatus]
Here, an example of the image forming apparatus of the present invention will be described with reference to the drawings.
FIG. 3 is a schematic block diagram showing an example of the image forming apparatus 500 of the present invention. The image forming apparatus 500 includes four image forming units 1Y, 1C, 1M, and 1K for yellow, magenta, cyan, and black (hereinafter, may be described as Y, C, M, and K). These use Y, C, M, and K toners of different colors as an image forming substance for forming an image, but have the same configuration except the above.

Above the four imaging units 1, a transfer unit 60 including an intermediate transfer belt 14 as an intermediate transfer member is disposed. The toner images of the respective colors formed on the surfaces of the photosensitive members 3Y, 3C, 3M, and 3K included in the image forming units 1Y, 1C, 1M, and 1K described in detail later are superimposed on the surface of the intermediate transfer belt 14. It is a configuration to be transferred.
Further, the optical writing unit 40 is disposed below the four image forming units 1. The optical writing unit 40 serving as a latent image forming unit irradiates the photosensitive members 3Y, 3C, 3M, and 3K of the image forming units 1Y, 1C, 1M, and 1K with laser light L emitted based on image information. Thereby, electrostatic latent images for Y, C, M and K are formed on the photosensitive members 3Y, 3C, 3M and 3K. The optical writing unit 40 polarizes the laser light L emitted from the light source by the polygon mirror 41 rotationally driven by the motor, and the photosensitive members 3Y, 3C, 3M, 3K via a plurality of optical lenses and mirrors. To the Instead of the above configuration, it is also possible to employ one that performs light scanning with an LED array.

  Below the optical writing unit 40, a first sheet feeding cassette 151 and a second sheet feeding cassette 152 are disposed to overlap in the vertical direction. In each of these sheet feeding cassettes, a plurality of recording media P are accommodated in the form of a sheet bundle, and the top recording medium P is provided with a first sheet feeding roller 151a and a second sheet feeding. The rollers 152a are in contact with each other. When the first sheet feeding roller 151a is driven to rotate counterclockwise in FIG. 3 by driving means (not shown), the top recording medium P in the first sheet feeding cassette 151 is vertically oriented in the right side of FIG. 3 of the cassette. The sheet is discharged toward the sheet feed path 153 disposed to extend to the In addition, when the second sheet feeding roller 152a is rotationally driven counterclockwise in FIG. 3 by a driving unit (not shown), the uppermost recording medium P in the second sheet feeding cassette 152 is discharged toward the sheet feeding path 153. Be done.

  In the paper feed path 153, a plurality of conveyance roller pairs 154 are disposed. The recording medium P fed into the sheet feeding path 153 is conveyed from the lower side to the upper side in FIG. 3 in the sheet feeding path 153 while being nipped between the rollers of the conveying roller pair 154.

  A pair of registration rollers 55 is disposed at the downstream end of the sheet feeding path 153 in the conveyance direction. The registration roller pair 55 temporarily stops the rotation of both rollers as soon as the recording medium P sent from the conveyance roller pair 154 is nipped between the rollers. Then, the recording medium P is sent out to a secondary transfer nip described later at an appropriate timing.

FIG. 4 is a block diagram showing a schematic configuration of one of the four imaging units 1.
As shown in FIG. 4, the image forming unit 1 includes a drum-shaped photosensitive member 3 as an image bearing member. The photosensitive member 3 has a drum shape, but may have a sheet shape or an endless belt shape.
Around the photosensitive member 3, a charging roller 4, a developing device 5, a primary transfer roller 7, a cleaning device 6, a lubricant applying device 10, and a discharge lamp (not shown) are disposed. The charging roller 4 is a charging member provided in a charging device as a charging means, and the developing device 5 is a developing means for forming a latent image formed on the surface of the photosensitive member 3 into a toner image. The primary transfer roller 7 is a primary transfer member provided in a primary transfer device as primary transfer means for transferring the toner image on the surface of the photosensitive member 3 to the intermediate transfer belt 14. The cleaning device 6 is a cleaning unit that cleans the toner remaining on the photosensitive member 3 after the toner image is transferred to the intermediate transfer belt 14. The lubricant application device 10 is a lubricant application means for applying a lubricant on the surface of the photosensitive member 3 after the cleaning device 6 has cleaned. The charge removing lamp (not shown) is a charge removing means for removing the surface potential of the photosensitive member 3 after cleaning.

The charging roller 4 is disposed in non-contact with the photosensitive member 3 with a predetermined distance, and charges the photosensitive member 3 to a predetermined polarity and a predetermined potential. The surface of the photosensitive member 3 uniformly charged by the charging roller 4 is irradiated with the laser light L based on the image information from the optical writing unit 40 which is a latent image forming unit to form an electrostatic latent image.
The developing device 5 has a developing roller 51 as a developer carrier. A developing bias is applied to the developing roller 51 from a power supply (not shown). In the casing of the developing device 5, there are provided a feed screw 52 and a stirring screw 53 for stirring the developer contained in the casing while conveying them in opposite directions. Further, a doctor 54 for regulating the developer carried on the developing roller 51 is also provided. The toner in the developer stirred and conveyed by the two screws of the supply screw 52 and the stirring screw 53 is charged to a predetermined polarity. Then, the developer is pumped onto the surface of the developing roller 51, and the pumped developer is regulated by the doctor 54, and the toner adheres to the latent image on the photosensitive member 3 in the developing region facing the photosensitive member 3. .

The cleaning device 6 has a fur brush 101, a cleaning blade 62 and the like. The cleaning blade 62 is configured of a flat support member made of a rigid material such as metal or hard plastic, and a flat elastic member. The elastic member is fixed to one end side of the support member by an adhesive or the like, and the other end side of the support member is cantilevered by the case of the cleaning device 6.
The cleaning blade 62 is composed of a support member and a flat elastic member having one end connected to the support member and a free end having a predetermined length at the other end, which is one end on the free end side of the elastic member. The contact portion 62c is disposed to abut on the surface of the image carrier 3 along the longitudinal direction. The cleaning blade 62 is in contact with the photosensitive member 3 in the counter direction with respect to the surface movement direction of the photosensitive member 3.
The lubricant applying device 10 includes a solid lubricant 103, a lubricant pressing spring 103a, and the like, and uses the fur brush 101 as a coating brush for applying the solid lubricant 103 onto the photosensitive member 3. The solid lubricant 103 is held by the bracket 103 b and pressed against the fur brush 101 by the lubricant pressing spring 103 a. Then, the solid lubricant 103 is scraped off by the fur brush 101 rotating in the rotational direction with respect to the rotation direction of the photosensitive member 3, and the lubricant is applied onto the photosensitive member 3. By applying a lubricant to the photosensitive member, the coefficient of friction of the surface of the photosensitive member 3 is maintained at 0.2 or less at the time of non-image formation.

  The charging device is a non-contact proximity arrangement method in which the charging roller 4 is brought close to the photosensitive member 3. Well-known charging devices include corotrons, scorotrons, solid-state chargers and the like. Configurations can be used. Among these charging methods, particularly, a contact charging method or a non-contact close arrangement method is more desirable, and it has advantages such as high charging efficiency and small amount of ozone generation, and the device can be miniaturized.

The light source of the laser light L of the optical writing unit 40 and the light source such as the discharge lamp include fluorescent lamp, tungsten lamp, halogen lamp, mercury lamp, sodium lamp, light emitting diode (LED), semiconductor laser (LD), electroluminescence (EL) Luminescent materials in general such as) can be used.
Moreover, in order to irradiate only the light of a desired wavelength range, various filters, such as a sharp cut filter, a band pass filter, a near infrared cut filter, a dichroic filter, an interference filter, a color temperature conversion filter, can also be used.
Among these light sources, light emitting diodes and semiconductor lasers are used well because they have high irradiation energy and have long wavelength light of 600 nm to 800 nm.

A transfer unit 60 as transfer means shown in FIG. 3 includes a belt cleaning unit 162, a first bracket 63, a second bracket 64 and the like in addition to the intermediate transfer belt 14 of the present invention.
In addition, four primary transfer rollers 7Y, 7C, 7M, 7K, a secondary transfer backup roller 66, a drive roller 67, an auxiliary roller 68, a tension roller 69, and the like are also provided. The intermediate transfer belt 14 of the present invention is endlessly moved counterclockwise in FIG. 3 by the rotational drive of the drive roller 67 while being stretched over the eight roller members. The four primary transfer rollers 7Y, 7C, 7M, 7K sandwich the intermediate transfer belt 14 thus endlessly moved between the photosensitive members 3Y, 3C, 3M, 3K to form primary transfer nips. . Then, a transfer bias of the opposite polarity (for example, plus) to the toner is applied to the back surface (inner peripheral surface of the loop) of the intermediate transfer belt 14. The intermediate transfer belt 14 sequentially passes the primary transfer nips for Y, C, M, and K along with the endless movement, and the front surface of the intermediate transfer belt 14 is on the photosensitive members 3Y, 3C, 3M, and 3K. The Y, C, M, K toner images are superimposed and primarily transferred. Thus, a four-color superimposed toner image (hereinafter, may be referred to as a four-color toner image) is formed on the intermediate transfer belt 14.

  The secondary transfer backup roller 66 sandwiches the intermediate transfer belt 14 with a secondary transfer roller 70 disposed outside the loop of the intermediate transfer belt 14 to form a secondary transfer nip. The registration roller pair 55 described above feeds the recording medium P sandwiched between the rollers toward the secondary transfer nip at a timing that can synchronize the four-color toner image on the intermediate transfer belt 14. The four-color toner image on the intermediate transfer belt 14 of the present invention has a secondary transfer electric field formed between the secondary transfer roller 70 to which the secondary transfer bias is applied and the secondary transfer backup roller 66, a nip pressure, In the secondary transfer nip, the image is collectively secondarily transferred to the recording medium P. Then, in combination with the white color of the recording medium P, a full color toner image is formed.

  After passing through the secondary transfer nip, transfer residual toner which has not been transferred to the recording medium P is attached to the intermediate transfer belt 14 of the present invention. This is cleaned by the belt cleaning unit 162. The belt cleaning unit 162 has a belt cleaning blade 162a in contact with the front surface of the intermediate transfer belt 14, thereby scraping off and removing the transfer residual toner on the intermediate transfer belt 14.

  The first bracket 63 of the transfer unit 60 is configured to swing at a predetermined rotation angle about the rotation axis of the auxiliary roller 68 with the on / off of the drive of a solenoid (not shown). When forming a monochrome image, the image forming apparatus 500 rotates the first bracket 63 a little in the counterclockwise direction in FIG. 3 by the drive of the aforementioned solenoid. By rotating the primary transfer rollers 7 Y, 7 C, 7 M for Y, C, M around the rotation axis of the auxiliary roller 68 by this rotation, the intermediate transfer belt 14 is rotated Y, C counterclockwise in FIG. , And M photosensitive members 3Y, 3C, and 3M. Then, among the four image forming units 1Y, 1C, 1M, and 1K, only the K image forming unit 1K is driven to form a monochrome image. As a result, it is possible to avoid the consumption of each member constituting the image forming unit 1 by driving the image forming unit 1 for Y, C, M wastefully at the time of monochrome image formation.

  A fixing unit 80 is disposed above the secondary transfer nip. The fixing unit 80 includes a pressure heating roller 81 containing a heat source such as a halogen lamp, and a fixing belt unit 82. The fixing belt unit 82 includes a fixing belt 84 as a fixing member, a heating roller 83 containing a heat source such as a halogen lamp, a tension roller 85, a driving roller 86, and a temperature sensor (not shown). Then, the endless fixing belt 84 is endlessly moved in the counterclockwise direction in FIG. 3 while being stretched by the heating roller 83, the tension roller 85, and the driving roller 86. In the process of this endless movement, the fixing belt 84 is heated by the heating roller 83 from the back side. A pressure heating roller 81, which is driven to rotate clockwise in FIG. 3, is in contact with the fixing belt 84, which is heated as described above, from the front side. As a result, a fixing nip where the pressure heating roller 81 and the fixing belt 84 abut is formed.

  A temperature sensor (not shown) is disposed on the outer side of the loop of the fixing belt 84 so as to face the front surface of the fixing belt 84 via a predetermined gap, and a temperature sensor of the fixing belt 84 just before entering the fixing nip. Detect the surface temperature. The detection result is sent to a fixing power circuit (not shown). The fixing power supply circuit performs on / off control of the supply of power to the heat generation source contained in the heating roller 83 and the heat generation source contained in the pressure heating roller 81 based on the detection result by the temperature sensor.

  The recording medium P that has passed through the above-described secondary transfer nip is separated from the intermediate transfer belt 14 and then sent into the fixing unit 80. Then, the sheet is heated and pressed by the fixing belt 84 in the process of being transported from the lower side to the upper side in FIG. 3 while being sandwiched by the fixing nip in the fixing unit 80, the full color toner image is fixed to the recording medium P Be done.

  The recording medium P thus subjected to the fixing process passes between the rollers of the discharge roller pair 87, and is then discharged to the outside of the machine. A stack portion 88 is formed on the upper surface of the frame of the image forming apparatus 500 main body, and the recording medium P discharged to the outside by the discharge roller pair 87 is sequentially stacked on the stack portion 88.

  Above the transfer unit 60, four toner cartridges 100Y, 100C, 100M and 100K for storing Y, C, M and K toners are disposed. The Y, C, M and K toners in the toner cartridges 100Y, 100C, 100M and 100K are appropriately supplied to developing units of the image forming units 1Y, 1C, 1M and 1K. The toner cartridges 100Y, 100C, 100M and 100K are detachable from the image forming apparatus main body independently of the image forming units 1Y, 1C, 1M and 1K.

Next, an image forming operation in the image forming apparatus 500 will be described.
First, when a print execution signal is received from an operation unit (not shown) or the like, predetermined voltages or currents are sequentially applied to the charging roller 4 and the developing roller 51 at predetermined timings.
Similarly, a predetermined voltage or current is sequentially applied to the light writing unit 40 and a light source such as a discharge lamp at a predetermined timing, respectively. Further, in synchronization with this, the photosensitive member 3 is rotationally driven in the direction of the arrow in FIG. 3 by a photosensitive member drive motor (not shown) as a driving means.

When the photosensitive member 3 rotates in the direction of the arrow in FIG. 3, first, the surface of the photosensitive member 3 is uniformly charged to a predetermined potential by the charging roller 4. Then, laser light L corresponding to the image information is irradiated onto the photosensitive member 3 from the optical writing unit 40, and the portion of the surface of the photosensitive member 3 irradiated with the laser light L is neutralized to form an electrostatic latent image. .
The surface of the photosensitive member 3 on which the electrostatic latent image is formed is rubbed by a magnetic brush of a developer formed on the developing roller 51 at a portion facing the developing device 5. At this time, the negatively charged toner on the developing roller 51 is moved to the electrostatic latent image side by a predetermined developing bias applied to the developing roller 51, and the toner image is formed (developed). The same imaging process is performed in each imaging unit 1, and toner images of the respective colors are formed on the surfaces of the photosensitive members 3Y, 3C, 3M, and 3K of the imaging units 1Y, 1C, 1M, and 1K. .
As described above, in the image forming apparatus 500, the electrostatic latent image formed on the photosensitive member 3 is reversely developed by the developing device 5 with the negatively charged toner. In the present embodiment, an example using the non-contact charging roller method of N / P (negative positive: toner adheres to a low potential) is described, but the present invention is not limited thereto.

The toner images of the respective colors formed on the surfaces of the photosensitive members 3Y, 3C, 3M, and 3K are sequentially primarily transferred so as to overlap on the surface of the intermediate transfer belt 14. Thus, a four-color toner image is formed on the intermediate transfer belt 14.
The four-color toner image formed on the intermediate transfer belt 14 is fed from the first sheet feeding cassette 151 or the second sheet feeding cassette 152, passes between the rollers of the registration roller pair 55, and is fed to the secondary transfer nip. Transferred to the recording medium P. At this time, the recording medium P is temporarily stopped in a state of being sandwiched between the registration roller pair 55, and is supplied to the secondary transfer nip in synchronization with the leading end of the image on the intermediate transfer belt. The recording medium P on which the toner image has been transferred is separated from the intermediate transfer belt 14 and conveyed to the fixing unit 80. Then, when the recording medium P to which the toner image is transferred passes through the fixing unit 80, the toner image is fixed on the recording medium P by the action of heat and pressure, and the recording medium P on which the toner image is fixed is an image. It is discharged out of the forming apparatus 500 and stacked in the stack section 88.

On the other hand, on the surface of the intermediate transfer belt 14 on which the toner image is transferred to the recording medium P at the secondary transfer nip, the transfer residual toner on the surface is removed by the belt cleaning unit 162.
Further, on the surface of the photosensitive member 3 on which the toner image of each color is transferred to the intermediate transfer belt 14 at the primary transfer nip, the residual toner after transfer is removed by the cleaning device 6, and the lubricant is applied by the lubricant application device 10. After that, the electricity is removed by the discharge lamp.

  In the image forming unit 1 of the image forming apparatus 500, as shown in FIG. 4, the photosensitive member 3 and the charging roller 4, the developing device 5, the cleaning device 6 and the lubricant applying device 10 as process means are contained in the frame 2. It is done. The image forming unit 1 is integrally removable from the main body of the image forming apparatus 500 as a process cartridge. In the image forming apparatus 500, the imaging unit 1 integrally exchanges the photosensitive member 3 as a process cartridge with the process means. However, the photosensitive member 3, the charging roller 4, the developing device 5, the cleaning device 6 Alternatively, the lubricant application device 10 may be replaced with a new one.

  As the toner used in the image forming apparatus 500, from the viewpoint of improving the image quality, use is made of a polymerized toner produced by a suspension polymerization method, an emulsion polymerization method, or a dispersion polymerization method that facilitates the formation of a large circle and a small particle size. Is preferred. Among these, from the viewpoint of forming a high resolution image, it is preferable to use a polymerized toner having an average circularity of 0.97 or more and a volume average particle diameter of 5.5 μm or less.

  EXAMPLES The present invention will be more specifically described below with reference to examples and comparative examples, but the present invention is not limited by these examples. In the examples, "parts" is "parts by weight".

Example 1
(Preparation of resin pellet 1)
Thermoplastic resin polyvinylidene fluoride (Kynar 720 manufactured by Arkema Japan, melting point 168 ° C.) 89.99 parts, conductive inorganic particles carbon black (manufactured by Denki Kagaku Kogyo Co., Ltd .: Denka black) 5 parts, conductive inorganic particles NTA 0.01 parts of glass (Tokai Sangyo Co., Ltd.) was put into a twin-screw kneader (L / D = 40) and melted and kneaded at 180 ° C. to produce a resin pellet 1.

(Formation of endless intermediate transfer belt)
A thermoplastic resin (Kynar 720, manufactured by Arkema Japan Co., Ltd.) as a base material is introduced into the hopper portion of a twin-screw extrusion molding apparatus (L / D = 40) in the amount ratio described in Table 1, and from the side feeder The conductive resin (Pellestat 230, Sanyo Chemical Industries, Ltd.) of the quantitative ratio described in the above was mixed while being added, and extruded from a φ200 mm circular die. The kneading speed was set to be 30 rpm. The temperature of the cylinder having the side feeder portion was 180 ° C., the temperature of the circular die was 200 ° C., and an endless intermediate transfer belt having a thickness of 100 μm was formed. The addition amount of the conductive resin (1) was adjusted to be 5% by weight of the whole material.

Example 2
A seamless belt was formed in the same manner as in Example 1 except that the amount of polyvinylidene fluoride added was 85 parts by weight, and the amount of NTA glass added was changed to 5 parts.

[Example 3]
A seamless belt was formed in the same manner as in Example 1 except that the resin was changed to polypropylene (Novatec PP EA6A, Japan Polypropylene Corporation).

Example 4
A seamless belt was formed in the same manner as in Example 3, except that the amount of polypropylene added was 85 parts by weight, and the amount of NTA glass added was changed to 5 parts.

[Example 5]
The resin is changed to ETFE (Fluon LM-730AP, Asahi Glass Co., Ltd., melting point 225 ° C.), the conductive resin is changed to Pelestat NC 6321 (melting point 203 ° C.), the twin-screw kneader temperature is 240 ° C., side feeder portion A seamless belt was formed in the same manner as in Example 1 except that the temperature of one of the cylinders was 250 ° C. and the temperature of the circular die was 265 ° C.

[Example 6]
A seamless belt was formed in the same manner as in Example 5 except that the amount of ETFE added was changed to 85 parts by weight and the amount of NTA glass added was changed to 5 parts.

[Example 7]
A seamless belt was formed in the same manner as in Example 1 except that the resin was changed to polymethacrylic styrene resin (Sebian-MAS MAS10, Daicel Co., Ltd.) and the kneading speed of the twin-screw kneading apparatus was 80 rpm.

[Example 8]
A seamless belt was formed in the same manner as in Example 7 except that the addition amount of the polymethacrylic styrene resin was changed to 85 parts by weight and the addition amount of the NTA glass was changed to 5 parts.

[Glossiness]
The glossiness of the surface of the endless intermediate transfer belt was measured using a gloss meter (Handy-type gloss meter PG-II / IIM manufactured by Nippon Denshoku Industries Co., Ltd.). The value of 60 degree gloss was recorded for any 10 points on the surface of the endless intermediate transfer belt, and the average value was obtained.

[Resistivity]
The resistivity of the endless intermediate transfer belt was measured using a Hiresta UP MCP-HT450 (manufactured by Dia Instruments). The surface resistivity measures the value after 10 seconds application at 100V and 500V, and the volume resistivity measures the value after 10 seconds application at 100V and 250V, taking the average of a plurality of measurement points respectively did.
The surface resistivity and volume resistivity pass the range of 1.00E + 08 to 9.99E + 13. “OVER” in Table 5 indicates that it is 1.00E + 14 or more, and “UNDER” indicates that it is less than 9.99E + 07.
Further, the surface resistivity was measured at 20 points in the circumferential direction of the belt at an applied voltage of 500 V, and the difference between the maximum value and the minimum value of the value obtained by taking the common logarithm was obtained.

Comparative Example 1
A seamless belt was formed in the same manner as in Example 1 except that the amount of addition of polyvinylidene fluoride was changed to 85 parts and the amount of addition of NTA glass was changed to 0 parts.

Comparative Example 2
A seamless belt was formed in the same manner as in Comparative Example 1 except that the amount of polyvinylidene fluoride added was 83 parts and the amount of NTA glass added was 7 parts.

Comparative Example 3
A seamless belt was formed in the same manner as in Comparative Example 1 except that the resin was changed to polypropylene (Novatec PP EA6A, Japan Polypropylene Corporation).

Comparative Example 4
A seamless belt was formed in the same manner as in Comparative Example 3 except that the amount of polypropylene added was 90 parts by weight and the amount of NTA glass added was changed to 5 parts.

Comparative Example 5
The resin is changed to ETFE (Fluon LM-730AP, Asahi Glass Co., Ltd., melting point 225 ° C.), the conductive resin is changed to Pelestat NC 6321 (melting point 203 ° C.), the twin-screw kneader temperature is 240 ° C., side feeder portion A seamless belt was formed in the same manner as in Comparative Example 1 except that the temperature of one of the cylinders was 250 ° C. and the temperature of the circular die was 265 ° C.

Comparative Example 6
A seamless belt was formed in the same manner as in Comparative Example 5 except that the amount of ETFE added was changed to 83 parts and the amount of NTA glass added was changed to 5 parts.

Comparative Example 7
A seamless belt was formed in the same manner as in Comparative Example 1 except that the resin was changed to polymethacrylic styrene resin (Sebian-MAS MAS10, Daicel Co., Ltd.) and the kneading speed of the twin-screw kneader was set to 80 rpm.

Comparative Example 8
A seamless belt was formed in the same manner as in Comparative Example 7 except that the addition amount of polymethacrylic styrene resin was changed to 83 parts by weight and the addition amount of NTA glass was changed to 7 parts.

(About Figure 3)
500 image forming apparatus 1Y, 1C, 1M, 1K Imaging unit 3Y, 3C, 3M, 3K photoconductor 7Y, 7C, 7M, 7K Primary transfer roller 14 Intermediate transfer belt 40 Optical writing unit 41 Polygon mirror 55 Registration roller pair 60 Transfer unit 63 first bracket 64 second bracket 66 secondary transfer backup roller 67 drive roller 68 auxiliary roller 69 tension roller 70 secondary transfer roller 80 fixing unit 81 pressure heating roller 82 fixing belt unit 83 heating roller 84 fixing belt 85 tension Roller 86 Drive roller 87 Ejection roller pair 88 Stack portion 100Y, 100C, 100M, 100K Toner cartridge 151 first sheet feed cassette 151a first sheet feed roller 152 second sheet feed cassette 152a second sheet feed roller La 153 feeding path 154 conveying roller pair 162 belt cleaning unit 162a belt cleaning blade P recording medium L laser beam (about 4)
Reference Signs List 2 frame 3 photosensitive member 4 charging roller 5 developing device 6 cleaning device 7 primary transfer roller 10 lubricant application device 14 intermediate transfer belt 51 developing roller 52 supply screw 53 stirring screw 54 doctor 62 cleaning blade 101 fur brush 103 solid wax 103 a spring 103b Solid wax energizing section

JP, 2009-25625, A JP 2007-65587 A Patent No. 3821600 JP 2008-239947 A Japanese Patent Application No. 2013-02685

Claims (6)

A half containing a thermoplastic resin , a polymer having a polyether unit which is a conductive resin, and conductive particles, and having a specific resistance value of 10 ^-10 ohm ^-1 cm ^-1 to 10 ^-1 ohm ^-1 cm ^-1 A conductive resin composition,
The thermoplastic resin is polyethylene, homopolymer and / or copolymer of polypropylene, homopolymer of vinylidene fluoride and / or vinylidene fluoride copolymer, polyethylene-tetrafluoroethylene resin (ETFE), vinylidene fluoride-tetrafluoroethylene copolymer. From polymer resin (PVDF-ETFE), polychlorotrifluoroethylene (PCTFE), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), tetrafluoroethylene perfluoroalkyl vinyl ether copolymer (PFA) and polymethacrylstyrene One or more selected resins,
The conductive particles are carbon black and conductive glass,
The content of the conductive glass is Ri 0.01 wt% 5.0 wt% der,
The conductive resin is in a microphase separation state in which island portions having a sea-island structure are formed in the thermoplastic resin, and the size D2 of domains of the island portions of the conductive resin and the particle diameter D1 of the conductive glass are D1> semiconductive resin composition, wherein the relationship near Rukoto of D2.   The semiconductive resin composition according to claim 1, wherein the conductive glass is a vanadate having an average primary particle diameter D1 of 0.5 μm to 5 μm. The semiconductive resin composition according to any one of claims 1 to 2, wherein a difference in SP value between the conductive resin and the thermoplastic resin is 2.5 or more. At least an electrostatic latent image forming unit for forming an electrostatic latent image on an image carrier, a developing unit for forming a toner image by using toner on the electrostatic latent image formed on the image carrier, an image A primary transfer means for transferring the toner image on the carrier onto the intermediate transfer belt, a secondary transfer means for transferring the toner image on the intermediate transfer belt onto the recording medium, and fixing the toner image on the recording medium An intermediate transfer belt for use in an image forming apparatus comprising a fixing unit, wherein the intermediate transfer belt is an intermediate transfer belt using the semiconductive composition according to any one of claims 1 to 3. An image forming apparatus characterized by At least an electrostatic latent image forming unit for forming an electrostatic latent image on an image carrier, a developing unit for forming a toner image by using toner on the electrostatic latent image formed on the image carrier, an image A transfer belt for transporting the recording medium to transfer the toner image on the carrier onto the recording medium, a transfer unit for transferring the toner image on the image carrier onto the recording medium, and the recording medium A transfer belt for use in an image forming apparatus, comprising: fixing means for fixing a toner image according to any one of claims 1 to 3, wherein the transfer belt uses a semiconductive composition according to any one of claims 1 to 3. An image forming apparatus characterized by being a belt. Containing a thermoplastic resin, a polymer having a polyether unit that is a conductive resin, and conductive particles, and having a specific resistance value of 10 ^-10 ohm ^-1 cm ^-1 ~ 10 ^-1 ohm ^-1 cm ^-1 Yes,
The thermoplastic resin is polyethylene, homopolymer and / or copolymer of polypropylene, homopolymer of vinylidene fluoride and / or vinylidene fluoride copolymer, polyethylene-tetrafluoroethylene resin (ETFE), vinylidene fluoride-tetrafluoroethylene copolymer. From polymer resin (PVDF-ETFE), polychlorotrifluoroethylene (PCTFE), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), tetrafluoroethylene perfluoroalkyl vinyl ether copolymer (PFA) and polymethacrylstyrene One or more selected resins,
The conductive particles are carbon black and conductive glass,
The content of the conductive glass is 0.01 wt% to 5.0 wt%,
The conductive resin is in a microphase separation state in which island portions having a sea-island structure are formed in the thermoplastic resin, and the size D2 of domains of the island portions of the conductive resin and the particle diameter D1 of the conductive glass are A transfer belt comprising the steps of: melt-kneading a semiconductive resin composition having a relationship of D1> D2 to obtain a melt-kneaded product; and extruding the melt-kneaded product to obtain a molded product Manufacturing method.

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