JPH08254906A - Transfer material carrying member and image forming device - Google Patents

Abstract

PURPOSE: To make it possible to obtain good images free from unequal transfer and transfer drop-out by providing a transfer carrying member which has a copolycarbonate resin having specific constituting units and contains powder consisting of barium sulfate therein. CONSTITUTION: This transfer carrying member contains the thermoplastic copolycarbonate resin which has the constituting units expressed by formula I and formula II and in which the constituting unit of the formula II is <=50wt.%. The powder consisting of the barium sulfate particulates having coating layers of tin oxide are incorporated into the copolycarbonate resin. In the formulas, A denotes 1 to 10C straight chain, branched chain or cyclic alkylidene group, aryl substd. alkylidene group, or -O-, -S-, -CO- or -SO2 ; R1 to R4 denote hydrogen, halogen or 1 to 4C alkyl groups or alkenyl groups. R5 denotes 2 to 6C alkylene groups or alkylidene groups; R6 and R7 denote 1 to 3C alkyl groups, phenyl groups or substd. phenyl group; (n) denotes an integer from 1 to 200.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer material carrying member and an image forming apparatus, and in particular, a toner image is transferred onto a transfer material on an image carrying body formed by an electrophotographic system, an electrostatic recording system or the like. The present invention relates to a transfer material carrying member and an image forming apparatus having the transfer material carrying member. As such an image forming apparatus, there are black-and-white, mono-color or full-color electrophotographic copying machines, printers, and other various recording devices.

[0002]

2. Description of the Related Art Conventionally, there are various transfer material carrying members used for transferring an image on an image carrier to a transfer material. For example, in an electrophotographic apparatus having an image forming means such as charging-image exposure-toner development-transfer-cleaning, a means for transferring a toner image on a photoconductor to a transfer material (for example, paper) is shown in FIGS. And a transfer device.

The transfer drum 10 has cylinders 12 and 13 arranged at both ends and a connecting portion 14 connecting these cylinders.
And a transfer material carrying member 11 is stretched over the opening of the outer peripheral surface of the support. Further, the connecting portion 14 has a transfer material gripper 15 that holds the transfer material fed from the paper feeding device. Furthermore, the transfer drum 1
A transfer discharger 21, an inner charge removal discharger 23, and outer charge removal dischargers 22, 24, which constitute charge removal means, are arranged inside and outside 0. In the transfer step, various mechanical or electrical external forces such as transfer of the transfer material, transfer charging, charge removal, and cleaning are applied to the transfer material supporting member 11, and therefore durability against these external forces, that is, mechanical strength,
Properties such as excellent wear resistance, electrical durability, and lubricity for cleaning members are required. Therefore, a resin film of Teflon, polyester, polyvinylidene fluoride, triacetate or the like has been used as the transfer material carrying member. However, when these resin films are used as a transfer material carrying member, peeling discharge occurs when the transfer material is peeled off from the photosensitive drum immediately after transfer, and the transfer material is charged due to this peeling discharge. Cannot escape and is held by the transfer material and the transfer material carrying member, and the toner image on the transfer material is disturbed,
The next transfer charging may not be performed uniformly. In such a case, it is necessary to strictly set the transfer conditions, such as precise control of the transfer current value or elimination of residual charges on the transfer material carrying member by reverse charging or AC charging.

In order to improve such a defect, as disclosed in JP-A-60-10625, carbon black is dispersed in a resin used for a transfer material carrying member so that the volume resistance of the resin film is arbitrarily set. The method of controlling is tried. However, when carbon black is dispersed in the resin, the translucency of the resin is lost. Further, when the conductive filler is dispersed in the resin used in the conventional transfer material carrying member, it is very difficult to uniformly disperse the filler in the resin,
When the volume resistance of the above-mentioned filler-dispersed film was measured over a wide range, even if the target resistance value was shown, the resistance value in the minute portion was non-uniform due to poor dispersion of the filler. When this film was used as a transfer material carrying member, the film resistance was non-uniform, so that image defects due to transfer unevenness or transfer gap were likely to occur.

Furthermore, since the dispersibility is poor, the filler-dispersed resin film has problems in production stability, film strength, resistance control, and the like.

In particular, in recent years, in order to realize higher image quality, the latent image is made fine and the developer has a particle size of 10 μm or less and an average particle size of 8 μm in order to improve the reproducibility of the latent image.
So-called small toner particles of about m have come to be used. Therefore, since the toner particles easily pick up very slight potential unevenness on the transfer material carrying member during transfer, there has been a demand for a transfer material carrying member that is less likely to cause uneven charging.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide a transfer material carrying member which is excellent in the above-mentioned properties and which can always obtain a good image without transfer unevenness and transfer blanking, and an image forming apparatus having the transfer material carrying member. To do.

[0008]

Means for Solving the Problems That is, the present invention contains a thermoplastic copolycarbonate resin having a constitutional unit represented by the formula [I], or a constitutional unit represented by the formula [I] and a formula: Having a structural unit represented by [II],
[II] contains a thermoplastic copolycarbonate resin having a constitutional unit of 50% by weight or less, and the copolycarbonate resin contains a powder of barium sulfate fine particles having a coating layer of tin oxide. And a transfer material carrying member.

[0009]

Embedded image (In the formula [I], A represents a linear, branched or cyclic alkylidene group having 1 to 10 carbon atoms, an aryl-substituted alkylidene group, or -O-, -S-, -CO- or -SO ₂ , R ₁ , R ₂ , R ₃ and R ₄ represent hydrogen, halogen or an alkyl or alkenyl group having 1 to 4 carbon atoms, wherein R ₅ is an alkylene group having 2 to 6 carbon atoms or an alkylidene group. , R ₆ and R ₇ are alkyl groups having 1 to 3 carbon atoms, phenyl groups or substituted phenyl groups, and n is 1 to 20.
Indicates an integer of 0. ) Further, the present invention is an image forming apparatus including the transfer material member.

The present invention will be described in detail below.

The copolymer having a constitutional unit represented by the formula [I] used in the present invention has the following formula [III]

[0012]

[Chemical 6] (In the formula, R _{1 to} R ₄ are the same as those described above.) The bisphenol can be obtained by interfacial polymerization in the presence of phosgene, carbonic acid ester, chloroformate or the like.

The copolymer having the constitutional unit represented by the formula [I] and the constitutional unit represented by the formula [II] used in the present invention has the following formula [III]:

[0014]

[Chemical 7] (In the formula, R _{1 to} R ₄ are the same as the above.), And a bisphenol represented by the following formula [IV]

[0015]

Embedded image (In the formula, R _{5 to} R ₇ are the same as those mentioned above.) The organopolysiloxane can be obtained by interfacial polymerization in the presence of phosgene, carbonic acid ester, chloroformate or the like. In this case, the structural unit represented by the formula [II] is 50% by weight or less, preferably 0.1 to 30% by weight, based on the total weight of the copolymer. In addition, n represents an integer of 1 to 200, preferably 5 to 100. Examples of R ₅ include ethylene, propylene, isopropylene, butylene, pentylene, and hexylene, with ethylene, propylene, and isopropylene being particularly preferred.

Specific examples of the bisphenol represented by the formula [III] are shown below, but the bisphenol used in the present invention is not limited to these.

[0017]

[Chemical 9]

[0018]

[Chemical 10]

[0019]

[Chemical 11]

[0020]

[Chemical 12]

[0021]

[Chemical 13]

Specific examples of the polyorganosiloxane used in the present invention are shown below, but the invention is not limited thereto.

[0023]

Embedded image

[0024]

[Chemical 15]

The copolymer of the formula [I] preferably used in the present invention may contain two or more kinds of the structural unit of the formula [I]. Further, the copolymer preferably used in the present invention and having the structural unit represented by the formula [I] and the structural unit represented by the formula [II] has 2 units of the structural unit represented by the formula [I] or the formula [II]. You may contain 1 or more types. Further, the above copolymer may be used as a mixture with another resin.

If desired, various known additives can be conventionally added to the resin. Examples of these include a reinforcing agent, an antioxidant, a filler, a stabilizer, an ultraviolet absorber, a lubricant, Examples include release agents, dyes, pigments, other flame retardants, and elastomers for improving impact resistance. For example, phosphorous acid or phosphite is particularly suitable as the stabilizer.
Examples of the releasing agent include saturated fatty acid monomers and polyhydric alcohol esters, and stearyl stearate, dipentaerythritol hexaoctate, and the like are preferable examples. Further, ordinary resins such as polycarbonate, polyester carbonate, and polyarylate can of course be suitably used according to the purpose.

The addition amount of barium sulfate fine particles as a filler is 20 with respect to 100 parts by weight of the transfer material carrying member of the present invention.
˜50 parts by weight. The filler can be simply blended with the copolycarbonate powder by providing a coating layer on the barium sulfate fine particles. Melt kneading is batch,
Both can be continuous.

The barium sulfate fine particles have excellent dispersibility. Further, since the refractive index of the barium sulfate fine particles is almost the same as the refractive index of the binder resin, the light transmittance does not decrease.

In the present invention, the conductive coating layer is provided on the barium sulfate fine particles so that the filler has an appropriate specific resistance. A coating layer formed of tin oxide is used as the coating layer. The specific resistance of the powder of barium sulfate having a coating layer is preferably 0.1 to 1000 Ωcm, more preferably 1 to 1000 Ωcm.

In the present invention, the powder resistivity is the resistance measuring device Loresta AP manufactured by Mitsubishi Yuka.
It measured using. The powder to be measured is 500 kg / c
The sample was solidified with a pressure of m ² and attached as a coin-shaped sample to the above measuring device.

The coverage of the coating layer is preferably 10 to 80% by weight, more preferably 30 to 60% by weight. The coverage of the coating layer is the ratio of the total weight of the coating layer used for this powder to the weight of the powder of fine particles having the coating layer. The average particle diameter of the barium sulfate fine particles having a coating layer is 0.05
.About.1.0 .mu.m, more preferably 0.07 to 0.7 .mu.m. In the present invention, the average particle size of the fine particles is a value measured by the centrifugal sedimentation method.

If necessary, the coating layer may contain fluorine or antimony. By containing fluorine or antimony, the specific resistance of the coating layer can be reduced. The tin oxide coating layer containing fluorine or antimony is a solid solution in which a fluorine atom or an antimony atom is incorporated in a tin oxide crystal lattice. The content of fluorine or antimony is 0.01 to 30% by weight with respect to the coating layer,
Further, 0.1 to 10% by weight is preferable.

The specific resistance of the coating layer can also be reduced by depleting the oxygen of tin oxide by the reduction method.

The resin film for a transfer material carrying member used in the present invention can be molded by a method such as extrusion molding or injection molding. The volume resistivity of such a resin film is 1
× 10 ² Ωcm to 1 × 10 ¹⁷ Ωcm is preferable, and the relative dielectric constant is preferably 2.5 or more. The shape may be a sheet shape or an endless belt shape by means of heat fusion, ultrasonic fusion, adhesion with an adhesive, or the like at the sheet end portion, and it may be any most preferable shape depending on the image forming apparatus used. The thickness of the film varies depending on the volume resistance and the relative dielectric constant, but is 50 μm to 300 μm, especially 7 μm.
0 μm to 200 μm is preferable.

The transfer material-carrying member of the present invention has durability against external electric and mechanical forces even when an external electric or mechanical force is applied by transfer charging, static elimination, paper conveyance, cleaning treatment, etc.
That is, since it has excellent electrical durability and mechanical strength, it can withstand repeated use. Furthermore, since it also has excellent electrical characteristics, it is possible to always perform stable transfer without unevenness or missing. Further, the transfer material-carrying member itself has excellent oil resistance, little oil adheres to the surface of the transfer material-carrying member, and does not contaminate the photoconductor.

As a result, good transfer is always performed even after repeated durability, and a stable image can always be obtained.

The image forming apparatus of the present invention will be described below.

A concrete example of the aspect of the image forming apparatus having the transfer material carrying member of the present invention is shown in FIGS. In the multicolor electrophotographic copying machine shown in FIGS. 3 and 4, an image carrier, that is, a photosensitive drum 3, which is rotatably supported and rotates in the direction of an arrow, is arranged, and an image forming means is arranged on the outer peripheral portion thereof. It The image forming means may be any means, but in this example, the primary charger 34 that uniformly charges the photosensitive drum 33.
Then, a color-separated light image or a light image corresponding thereto is irradiated to form an electrostatic latent image on the photosensitive drum 33. For example,
An exposure means 32 including a laser beam exposure device,
And a rotary developing device 31 for converting the electrostatic latent image on the photosensitive drum 33 into a visible image.

The rotary developing device 31 includes four developing devices 31 for accommodating four color developers of yellow color developer, magenta color developer, cyan color developer and black color developer, respectively.
It is composed of Y, 31M, 31C, 31Bk, and a substantially cylindrical housing that holds these four developing devices 31Y, 31M, 31C, 31Bk and is rotatably supported. The rotary developing device 31 conveys a desired developing device to a position facing the outer peripheral surface of the photosensitive drum 33 by the rotation of the housing, develops an electrostatic latent image on the photosensitive drum, and develops four colors of full color. Is configured to be possible.

The photosensitive drum 33 is uniformly charged by the primary charger 34, and the exposure means 32 irradiates the optical image E corresponding to the image information to form an electrostatic latent image on the photosensitive drum 33. The electrostatic latent image is visualized as a toner image by the rotary developing device 31 with the toner having an average particle diameter of 8 to 12 μm, which is made of resin as a base material, on the photosensitive drum 33.

On the other hand, the transfer material P is sent to the transfer drum 10 by the registration rollers 36 in synchronism with the image, and the tip of the transfer material P is gripped by the gripper 15, etc.
0 is conveyed in the direction of the arrow in the figure.

Next, in the area in contact with the photosensitive drum 33, a corona discharge having a polarity opposite to that of the toner is received from the back surface of the transfer material carrying member 11 of the transfer drum 10 by the transfer discharger 21, so that a toner image on the photosensitive drum 33 is received. Are transferred to the transfer material P.

The transfer material P is peeled from the transfer drum 10 by the action of the separating claw 28 while being discharged by the discharging dischargers 22, 23 and 24 after the necessary number of transfer steps are performed, and is fixed by the conveying belt 38. After being fixed by heat at 39, it is discharged to the outside of the machine.

On the other hand, the photosensitive drum 33 is subjected to the image forming process again after the residual toner on the surface is cleaned by the cleaning device 37.

Further, the transfer material carrying member 1 of the transfer drum 10
Similarly, the first surface also has a cleaning device 35 and a cleaning assisting means 35b, each of which includes a blade, a fur brush, or the like.
After being cleaned by the action of, the image forming process is performed again.

In the present invention, as shown in FIG. 2, an insulating member 26, such as a polycarbonate resin plate, is provided on the shield plate downstream of the transfer corona discharger 21 in the rotational direction (direction of arrow b) of the transfer drum 10. It is preferable to increase the amount of transfer corona toward the photosensitive drum 33 in the transfer corona.

Further, in the present invention, an elastic pressing member 27 extending from the introduction side of the transfer material carrying member 11 toward the downstream side in the moving direction may be provided. The pressing member 27 is made of polyethylene, polypropylene,
It is made of a synthetic resin film having a volume resistivity of 10 ¹⁰ Ωcm or more, particularly preferably 10 ¹⁴ Ωcm or more, such as polyester or polyethylene terephthalate, and is disposed over the entire transfer portion.

FIG. 4 shows a specific example of an image forming apparatus using the transfer material carrying member of the present invention when the shape is an endless belt.

The image forming apparatus shown in FIG. 4 has photosensitive drums 41a to 41d around which a primary charger 42a is provided.
-42d, exposing means 43a-43d, developing units 44a-4
4d, transfer chargers 45a to 45d, static eliminator electricity 46a to
46d, 47a to 47d, and photosensitive drum cleaning devices 48a to 48d, and an endless belt-shaped transfer material carrying member 40 of the present invention is disposed below the photosensitive drum so as to penetrate these units. A transfer material carrying member cleaning device 50 having a blade 49 is arranged.

After the transfer material P is fed by the paper feed roller, it is conveyed by the endless belt-shaped transfer material carrying member 40 through the transfer portion in which the transfer dischargers 45a to 45d are arranged.

Examples of the present invention will be described below, but the present invention is not limited to these examples.

[0052]

【Example】

(Example 1) Sodium hydroxide (3.8 kg) was dissolved in water (45 liters) and, while maintaining at 20 ° C, bisphenol A (BPA) (7.2 kg) and 2- (4-hydroxyphenyl) ethyl groups at both ends were added. Polydimethylsiloxane having an average number of repeating siloxane chains n = 40 (X-22-1
65B, 1.3 kg of Shin-Etsu Chemical Co., Ltd., and 8 g of hydrosulfite were dissolved.

Methylene chloride (MC) 32
While adding 1 liter and stirring, 158 g of p-t-butylphenol (PTBP) was added, and then phosgene 3.5.
b was blown in over 60 minutes. After blowing phosgene, the reaction solution was emulsified by vigorous stirring. After emulsification, 8 g of triethylamine was added, and the mixture was stirred for about 1 hour for polymerization.

The polymerization solution was separated into an aqueous layer and an organic layer, the organic layer was neutralized with phosphoric acid, 35 liters of isopropanol was added to precipitate the polymer, and the precipitate was filtered and dried to give a white color. Polycarbonate resin PC-X of was obtained.

Powder of 70 parts by weight of this polycarbonate resin PC-X and fine particles of barium sulfate having a coating layer of tin oxide (covering rate 50% by weight, powder resistivity 700)
Ωcm) 30 parts by weight were mixed with a tumbler and pelletized using a twin-screw extruder with a vent.

After extruding the obtained pellets, a film sheet having a thickness of 110 μm was obtained through a cooling roll.

In order to evaluate the lubricity of the resin film, a surface property tester (HEIDON-14, manufactured by Shinto Kagaku Co., Ltd.) was used to measure the slipperiness of the resin blade against a urethane blade under a load of 10 g. As a result, the output value of the sensor was 0.50 when the output of the polyethylene terephthalate film was 1. In this case, the smaller the output value of the sensor, the smaller the slip resistance, that is, the higher the lubricity.

A transfer drum as shown in FIGS. 1 and 2 was prepared using this resin film.

That is, as the transfer material carrying member 11, the transfer drum 10 was prepared by stretching the resin film between the two aluminum cylinders 12 and 13. Both ends of the transfer material carrying member 11 were fixed on a connecting portion 14 connecting the two aluminum cylinders 12 and 13 constituting the transfer drum 10. In this embodiment, the transfer drum 10 has a diameter of 160 mm and a moving speed of 150 mm / sec.
The opening width of the transfer corona discharger 21 is 19.5 mm.
In addition, the distance between the discharge wire 25 and the outer peripheral surface of the photosensitive drum 33 was set to 11 mm, and the distance between the discharge wire 25 and the bottom surface of the shield plate of the transfer corona discharger 21 was set to 16 mm.

As the pressing member 27, a polyethylene terephthalate resin film was used.

In this embodiment, a latent image is formed on the photosensitive drum 33 charged in the negative polarity by the image forming apparatus as shown in FIG. 3, and the reverse development is performed by using the toner having the average particle diameter of 8 μm. To obtain a toner image. At this time, the toner is composed of a resin as a coloring material and a slight amount of an additive for improving the charge controllability and lubricity, and is triboelectrically charged with carrier particles in the developing device to be negatively charged. It was

Then, the toner image was transferred onto a transfer material by the transfer device having the above-mentioned structure. Next, the transfer material was separated from the transfer drum 10 and fixed by a fixing device.

In this embodiment, the surface of the transfer material carrying member 11 of the transfer drum 10 is provided with a cleaning device 35a having a urethane blade and a cleaning assisting means 3.
Clean with 5b.

In the multicolor electrophotographic copying apparatus having the above structure, 1
An image output durability test of 000 sheets was performed. as a result,
The initial image was a good image without transfer unevenness, and the same good image as the initial image could be obtained even after running. The above results are shown in Table 1.

Example 2 Instead of 1.3 kg of polydimethylsiloxane (X-22-165B, manufactured by Shin-Etsu Chemical Co., Ltd.) used in Example 1, both ends had 3- (2-hydroxyphenyl) propyl groups. And polydimethylsiloxane having an average number of repetitions of siloxane chain n = 40 (BY16-7
52, manufactured by Toray Dow Corning Silicon Co., Ltd.) 1.3
Evaluation was made in the same manner as in the example except that kg was used. As a result, the initial image is a good image without uneven transfer,
Even after the durability test, the same good image as in the initial stage could be obtained.
The above results are shown in Table 1.

Example 3 Instead of the copolymer used in Example 1, a polycarbonate resin (Iupilon S-200) was used.
0, manufactured by Mitsubishi Gas Chemical Co., Inc.) A transfer material carrying member was prepared in the same manner as in Example 1 except that 75 parts by weight was used, and evaluated in the same manner as in Example 1. The results are shown in Table 1.

(Example 4) Instead of the filler used in Example 1, powder of barium sulfate fine particles having a fluorine-containing tin oxide coating layer (covering rate 50% by weight, fluorine content in the coating layer 9% by weight). %, Powder specific resistance 40 Ωc
m) A transfer material carrying member was prepared in the same manner as in Example 1 except that 40 parts by weight was used, and evaluated in the same manner as in Example 1.
The results are shown in Table 1.

(Example 5) A powder of barium sulfate fine particles having an antimony-containing tin oxide coating layer in place of the filler used in Example 1 (covering rate: 50% by weight, antimony content in the coating layer: 9% by weight). %, Powder specific resistance 4
(0 Ωcm) A transfer material carrying member was prepared in the same manner as in Example 1 except that 25 parts by weight was used, and evaluated in the same manner as in Example 1. The results are shown in Table 1.

(Comparative Example 1) In place of the filler used in Example 1, 25 parts by weight of a powder (T-1, manufactured by Mitsubishi Materials Corporation) consisting of antimony-containing tin oxide fine particles was used. A transfer material carrying member was prepared in the same manner as in Example 1 and evaluated in the same manner as in Example 1. The results are shown in Table 1.

(Comparative Example 2) Instead of the copolymer used in Example 1, a polycarbonate resin (Iupilon S-200) was used.
0, manufactured by Mitsubishi Gas Chemical Co., Inc.) and used as a filler in Example 1 except that 25 parts by weight of a powder (T-1, manufactured by Mitsubishi Materials Corporation) composed of antimony-containing tin oxide fine particles was used as a filler. A transfer material carrying member was prepared in the same manner and evaluated in the same manner as in Example 1. The results are shown in Table 1.

[0071]

[0072]

As described above, according to the present invention, excellent mechanical strength, lubricity, light-transmitting property, and excellent electrical characteristics are obtained, so that even if it is repeatedly used, there is no uneven transfer or missing transfer. It is possible to provide a transfer material carrying member capable of obtaining a good image and an image forming apparatus having the same.

[Brief description of drawings]

FIG. 1 is a schematic configuration example of a transfer drum using a transfer material carrying member of the present invention.

FIG. 2 is a schematic configuration example of a transfer device using the transfer material carrying member of the present invention.

FIG. 3 is a schematic configuration example of an image forming apparatus using a sheet-shaped transfer material carrying member of the present invention.

FIG. 4 is a schematic configuration example of an image forming apparatus using an endless belt-shaped transfer material carrying member of the present invention.

Claims (10)

[Claims] 1. A thermoplastic copolycarbonate resin having a constitutional unit represented by the following formula [I] is contained, and the copolycarbonate resin contains a powder of barium sulfate fine particles having a coating layer of tin oxide. A transfer material carrying member characterized in that Embedded image (In the formula, A linear C1-10, branched or cyclic alkylidene group, an aryl-substituted alkylidene group, or -O -, - S -, - CO- or indicates -SO _2,
R ₁ , R ₂ , R ₃ and R ₄ represent hydrogen, halogen or an alkyl group or alkenyl group having 1 to 4 carbon atoms. ) 2. A constitutional unit represented by the formula [I] and a formula [I
The structural unit of [II] is included, and the structural unit of [II] is 5
A transfer material carrying member comprising 0% by weight or less of a thermoplastic copolycarbonate resin, and the copolycarbonate resin containing a powder of barium sulfate fine particles having a coating layer of tin oxide. Embedded image (In the formula [I], A represents a linear, branched or cyclic alkylidene group having 1 to 10 carbon atoms, an aryl-substituted alkylidene group, or -O-, -S-, -CO- or -SO ₂ , R ₁ , R ₂ , R ₃ and R ₄ represent hydrogen, halogen or an alkyl or alkenyl group having 1 to 4 carbon atoms, wherein R ₅ is an alkylene group having 2 to 6 carbon atoms or an alkylidene group. , R ₆ and R ₇ are alkyl groups having 1 to 3 carbon atoms, phenyl groups or substituted phenyl groups, and n is 1 to 20.
Indicates an integer of 0. ) 3. The coverage of the coating layer is 10 to 80% by weight.
The transfer material carrying member according to claim 1. 4. The transfer material carrying member according to claim 1, wherein the coating layer contains fluorine or antimony. 5. The content of fluorine or antimony,
The transfer material carrying member according to claim 3, wherein the content is 0.01 to 30% by weight with respect to the coating layer. 6. An image forming apparatus having an image carrier and a transfer material carrying member, wherein the transfer material carrying member contains a thermoplastic copolycarbonate resin having a structural unit represented by the following formula [I], An image forming apparatus characterized in that the resin contains powder of barium sulfate fine particles having a coating layer of tin oxide. Embedded image (In the formula, A linear C1-10, branched or cyclic alkylidene group, an aryl-substituted alkylidene group, or -O -, - S -, - CO- or indicates -SO _2,
R ₁ , R ₂ , R ₃ and R ₄ represent hydrogen, halogen or an alkyl group or alkenyl group having 1 to 4 carbon atoms. ) 7. An image forming apparatus having an image carrier and a transfer material carrying member, wherein the transfer material carrying member has a structural unit represented by formula [I] and a structural unit represented by formula [II], II] contains a thermoplastic copolycarbonate resin having a constitutional unit of 50% by weight or less, and the copolycarbonate resin contains powder of barium sulfate fine particles having a coating layer of tin oxide. Image forming apparatus. [Chemical 4] (In the formula [I], A represents a linear, branched or cyclic alkylidene group having 1 to 10 carbon atoms, an aryl-substituted alkylidene group, or -O-, -S-, -CO- or -SO ₂ , R ₁ , R ₂ , R ₃ and R ₄ represent hydrogen, halogen or an alkyl or alkenyl group having 1 to 4 carbon atoms, wherein R ₅ is an alkylene group having 2 to 6 carbon atoms or an alkylidene group. , R ₆ and R ₇ are alkyl groups having 1 to 3 carbon atoms, phenyl groups or substituted phenyl groups, and n is 1 to 20.
Indicates an integer of 0. ) 8. The coverage of the coating layer is 10 to 80% by weight.
The image forming apparatus according to claim 6, wherein 9. The image forming apparatus according to claim 6, wherein the coating layer contains fluorine or antimony. 10. The image forming apparatus according to claim 8, wherein the content of the fluorine or antimony is 0.01 to 30% by weight with respect to the coating layer.