JP2002169382A - Electrophotographic semiconductive member and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrophotographic semiconductive member and a method for manufacturing the member having good durability even when carbon black with good dispersibility is used. SOLUTION: The electrophotographic semiconductive member contains at least a thermoplastic resin, carbon black and a low-retentive deterioration preventing agent of <=1000 ppm concentration. In the method for manufacturing the electrophotographic semiconductive member, at least a thermoplastic resin, carbon black and low-retentive deterioration preventing agent are mixed, molten and kneaded and then molded. The low retentive deterioration preventing agent is removed during melting and kneading or during molding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a semiconductive member for electrophotography in an image forming apparatus using an electrostatic copying system such as a copying machine or a printer.

[0002]

2. Description of the Related Art An image forming apparatus using an electrostatic copying method is
A uniform charge is formed on an image carrier made of a photoconductive photoreceptor, an electrostatic latent image is formed with a laser beam or the like that modulates an image signal, and then the electrostatic latent image is developed with a charged toner. To a visualized toner image. Thereafter, the required reproduced image is obtained by electrostatically transferring the toner image via an intermediate transfer member or directly to a transfer material such as recording paper.

Image formation employing a system (intermediate transfer member system) in which a toner image formed on the surface of the image carrier is primarily transferred to an intermediate transfer member, and a toner image on the intermediate transfer member is secondarily transferred to recording paper. An apparatus disclosed in Japanese Patent Application Laid-Open No. Sho 62-206567 is known.

As a material of a transfer belt as an intermediate transfer member used in an image forming apparatus employing an intermediate transfer member system, polycarbonate resin (JP-A-6-095521), PVDF (polyvinylidene fluoride) (JP-A-5-205)
-200904, JP-A-6-228335), polyalkylene phthalate (JP-A-6-1490)
No. 81), a blend material of PC (polycarbonate) / PAT (polyalkylene terephthalate) (JP-A-6-149083), ETFE (ethylene tetrafluoroethylene copolymer) / PC, ETFE / PAT,
PC / PAT blend material (JP-A-6-149079)
Endless belts made of a thermoplastic resin having electrical conductivity (e.g., Japanese Unexamined Patent Publication (Kokai) No. H10-216).

[0005] In order to obtain electrical stability, carbon black having high dispersibility may be added to the thermoplastic resin. However, when carbon black is added,
There is a problem that the thermoplastic resin is decomposed at the time of molding due to the catalytic action of the moisture adsorbed on the carbon black surface or the functional group on the carbon black surface, and the toughness is reduced.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a semiconductive member for electrophotography which has good durability even when carbon black having high dispersibility is used, and a method for producing the same.

[0007]

Means for Solving the Problems In view of the above problems, as a result of intensive studies, the present inventor has found that at least a thermoplastic resin, carbon black, and a low-persistence deterioration inhibitor are melt-kneaded. The inventors have found that a semiconductive member for electrophotography having good durability can be obtained, and have reached the present invention. That is, the present invention provides a semiconductive member for electrophotography, comprising: <1> at least a thermoplastic resin, carbon black, and a low residual deterioration preventing agent of 1000 ppm or less.

<2> The semiconductive member for electrophotography according to <1>, wherein the roll flexibility is 100 K rotation or more. <3> The low-persistency deterioration inhibitor comprises at least one of a phosphorus compound, a phenol compound, and a sulfur compound.
The electroconductive semiconductive member according to claim 1, wherein the semiconductive member is made of a seed.

<4> The carbon black has a pH of 5
The semiconductive member for electrophotography according to any one of <1> to <3>, wherein the member contains 3% by weight or more of volatile components.

[0010] <5> The amount of carbon black added is 0.5 to 30 phr. <1>
The semiconductive member for electrophotography according to any one of <1> to <4>. <6> The semiconductive member for electrophotography according to claim 5, wherein the addition amount of the deterioration inhibitor is 1 to 50% by weight of the addition amount of the carbon black.

<7> The method for producing a semiconductive member for electrophotography according to <1> to <6>, wherein at least a thermoplastic resin, carbon black, and a low-resistivity deterioration inhibitor are used. A method for producing a semiconductive member for electrophotography, which comprises mixing, melt-kneading, and molding, and removing the low residual deterioration inhibitor during the melt-kneading or molding.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The semiconductive member for electrophotography according to the present invention contains at least a thermoplastic resin, carbon black, and a low-residuality lowering inhibitor of 1000 ppm or less. Hereinafter, the semiconductive member for electrophotography of the present invention will be described. In this specification, "phr" means parts by weight.

<Method for Producing a Semiconductive Member for Electrophotography> The semiconductive member for electrophotography according to the present invention comprises at least a thermoplastic resin, carbon black, and a low-residual deterioration inhibitor under heating. It is manufactured by mixing, melt-kneading, and molding. In addition, the low-resistivity deterioration preventing agent is removed from the semiconductive member for electrophotography during the melt kneading or molding by volatilization or the like. The heating temperature is a temperature at which the thermoplastic resin is softened, and a known extruder or the like can be used for melt-kneading.

The thermoplastic resins used include polycarbonate resins, polyester resins, polyamide resins,
Polyarylate resin, polyethylene naphthalate resin,
And the like.

Carbon black is mixed to obtain electrical stability, and is preferably mixed so as to be 0.5 to 30 phr, more preferably 15 to 25 phr. preferable.

The carbon black has a pH of 5.0.
It is preferable to set the following. By oxidizing such carbon black, carboxyl groups,
It is manufactured by providing a quinone group, a lactone group, a hydroxyl group, and the like. As the method of the oxidation treatment, an air oxidation method of reacting by contacting with air at a high temperature, a method of reacting with nitrogen oxides and ozone at a normal temperature, a method of performing an air oxidation at a high temperature,
Ozone oxidation at a low temperature.

The pH of carbon black can be determined by preparing an aqueous suspension of the carbon black and measuring with a glass electrode. PH of carbon black
Can be adjusted depending on conditions such as a processing temperature and a processing time in the oxidation processing.

The carbon black preferably contains at least 3% by weight of volatile matter, more preferably at least 5% by weight.
If the volatile component is less than 3% by weight, the degree of dispersion of the carbon black in the resin is poor, and the electric resistance may not be stable. The content of such volatile matter can be determined from the weight loss before and after the heat treatment of carbon black at 950 ° C. for 7 minutes.

As a specific example of the carbon black to be used, "REGAL400R" manufactured by CABOT (pH 4.
0, volatile content 3.5% by weight), "MONARCH 130
0 "(pH 2.5, volatile content 9.5% by weight), Degus
sa Company's "Color Black FW200" (p
H2.5, volatile content 20% by weight), "SPECIALBL
ACK 4 "(pH 3, volatile content 14% by weight)," PRI
NTEX150T "(pH 4, volatile matter 10% by weight),
"PRINTEX140T" (pH 5, volatile matter 5% by weight), "PRINTEX U" (pH 5, volatile matter 5% by weight) and the like. These may be used alone,
Also, two or more kinds may be used as a mixture.

The low-persistence deterioration inhibitor is mixed in order to prevent the resin from decomposing and lowering the toughness when the semiconductive member for electrophotography is molded. As a result, a semiconductive member for electrophotography having excellent durability and excellent surface condition can be manufactured. Here, the "low persistence" of the "low persistence deterioration inhibitor" means that the deterioration inhibitor volatilizes in a temperature range at the time of melt-kneading or molding and is finally obtained in a semiconductive member for electrophotography. Is a property that hardly remains. In particular,
1000 ppm or less is essential in the semiconductive member for electrophotography, and the residual amount is preferably 800 ppm or less.
The residual amount of the deterioration preventing agent is determined by, for example, using a Soxhlet extraction device or the like, charging 1 g of a sample of the electroconductive semiconductive member in 300 ml of methanol, and heating continuously at a heating rate at which methanol is renewed in 3 minutes. The concentrated solution obtained by the time-extracted solution is analyzed by a pyrolysis gas chromatography method, and the determination is made based on the area of a peak caused by the low residual deterioration inhibitor.

As the low residual deterioration inhibitor, at least one of phosphorus compounds, phenol compounds, and sulfur compounds can be used. Specifically, examples of the phosphorus compound include triphenyl phosphite, diphenyl isodecyl phosphite, and phenyl diisodecyl phosphite. Examples of the phenolic compound include 1,1,3-tris (2-methyl-4-hydroxy-5-t-butylphenyl) butane and 1,3,5-trimethyl-2,4,6-tris (3,5 -Di-t-butyl-4-hydroxybenzyl) benzene and the like. Examples of the sulfur compound include dilauryl 3,3'-thiodipropionate, distearyl 3,3'-thiodipropionate, and the like. These low residual deterioration inhibitors can be used alone or in combination.

The addition amount of the low-persistence deterioration inhibitor is preferably 1 to 50% by weight, more preferably 1 to 30% by weight of the addition amount of carbon black. If the amount is less than 1% by weight, resin deterioration during molding may not be sufficiently prevented.
At least 00 ppm remains, bleeds out on the surface, and the toner is fixed.

The low-persistence deterioration inhibitor reacts with the moisture adsorbed on the carbon black surface in the extruder and the functional groups on the carbon black surface, and eventually volatilizes.
The low residual deterioration preventing agent hardly remains in the manufactured semiconductive member for electrophotography.

<Semiconductive Member for Electrophotography> The semiconductive member for electrophotography of the present invention is preferably manufactured by the above-described manufacturing method. Since the electroconductive semiconductive member manufactured by such a manufacturing method has a suppressed decomposition of the thermoplastic resin, the carbon black is present in a highly dispersed state, has high durability, and has a low residual deterioration preventing agent. It shows excellent material properties without any troubles caused by.

The semiconductive member for electrophotography of the present invention can be used without particular limitation as a member for an electrostatic copying type image forming apparatus. For example, it can be used for a charging device for charging a photoconductor, a transfer device for transferring toner to a medium, an intermediate transfer device for transferring toner from a photoconductor to paper, and the like. In addition to using the electroconductive semiconductive member alone, it can be used in the above-described image forming apparatus by providing a layer on the inside or outside of the member or covering another roll-shaped member.

FIG. 1 shows an outline of a full-color image forming apparatus in which the electroconductive semiconductive member of the present invention is applied as a member of a transfer member (intermediate transfer member) for an intermediate transfer device.

In FIG. 1, reference numeral 1 denotes a photosensitive drum as a latent image carrier, 2 denotes a transfer belt as an intermediate transfer member, and transfer belt 2 includes belt rollers 21, 23 and 2
4. It is stretched by the backup roller 22 and is arranged so that a part thereof is in contact with the surface of the photosensitive drum 101.

Around the photosensitive drum 101, developing devices 5, 6, 7, and 8 corresponding to the colors of BK (black), Y (yellow), M (magenta), and C (cyan) are provided. Further, a conductive roller 25 is disposed at a position facing the photosensitive drum 1 with the transfer belt 2 interposed therebetween.

Around the transfer belt 2, there are disposed a bias roller 3, an electrode roller 26, a peeling claw 13, a belt cleaner 9, and a feed roller 43, which are transfer electrodes.
The bias roller 3 includes a cleaning blade 31 and a backup roller 2 with the transfer belt 2 interposed therebetween.
2 is disposed at a position opposite to 2. An electrode roller 26 is provided around the backup roller 22 and inside the transfer belt 2.

Backup roller 22 and belt roller 2
4, a peeling claw 13 is provided. A belt cleaner 9 is disposed at a position facing the belt roller 24 with the transfer belt 2 interposed therebetween.

In the vicinity of the bias roller 3, there are provided a feed roller 43, a tray 4 for supplying a sheet 41 from a sheet bundle formed of sheets to be transferred, and a pickup roller 42.

The full-color image forming mechanism will be described below with reference to the image forming apparatus shown in FIG. As the photosensitive drum 1 rotates in the direction of arrow A, the surface thereof is uniformly charged by a charging device (not shown). Image writing means such as a laser writing device (not shown) on the surface of the charged photosensitive drum 1
As a result, an electrostatic latent image of the first color is formed. This electrostatic latent image is developed by any one of the developing devices, and a toner image T is formed. For example, if the electrostatic latent image written on the photosensitive drum 1 corresponds to black image information, the electrostatic latent image is developed by the developing device 5 containing black (BK) toner, A black toner image T is formed on the surface of the photosensitive drum 1.

In the case of forming a monochromatic image, the toner image T moves to the primary transfer portion where the conductive roller 25 is disposed by the rotation of the photosensitive drum 1, and the toner image T has the opposite polarity from the conductive roller 25 to the toner image T. By applying an electric field, the toner image T is electrostatically primarily transferred onto the surface of the transfer belt 2.
The primary-transferred unfixed toner image T is moved by the transfer belt 2 circling in the B direction, and
The toner image T is secondarily transferred onto the sheet 41 sent from the tray 4 by the pickup roller 42 and the feed roller 43 between the transfer roller 2 and the bias roller 3 for applying a transfer voltage having a polarity opposite to the charge polarity of the toner. The secondary-transferred toner image T on the sheet 41 is fixed by a fixing device (not shown) to form an image.

Here, when forming a full-color image in which a plurality of colors are superimposed, the steps of forming the toner image T on the surface of the photosensitive drum 1 and the primary transfer of the toner image T are repeated by the number of colors. Note that the separation claw 13 and the belt cleaner 9 are separated from the transfer belt 2 until the final color toner image T is primarily transferred to the transfer belt 2.

For example, when a full-color image is formed by superimposing four toner images T, black, yellow, magenta and cyan toner images T are formed on the surface of the photosensitive drum 1 every one rotation. Toner image T
Are primarily transferred onto the transfer belt 2 sequentially.

On the other hand, the transfer belt 2 circulates in the direction B in the same cycle as the photosensitive drum 1 while holding the first primary-transferred black toner image T on the surface of the transfer belt 2. Each time, the yellow, magenta and cyan toner images T are transferred so as to be superimposed on the black toner image T. In this way, toner images of four colors are sequentially formed, and are superposed on the transfer belt 2 to form a sheet 41.
A full-color image is formed on the surface of the transfer belt 2 before transfer to the transfer belt. After that, the full-color image is secondarily transferred onto the paper 41 and fixed by a fixing device (not shown) to form a full-color image.

The transfer belt 2 after the transfer of the toner image onto the recording paper 41 is subjected to removal of residual toner by a belt cleaner 9 provided downstream of the secondary transfer section to prepare for the next transfer. Further, a cleaning blade 31 made of polyurethane or the like is attached to the bias roll 3 so that the cleaning blade 31 is always in contact with the bias roll 3, so that foreign matters such as toner particles and paper dust adhered by transfer are removed.

In the case of transferring a single-color image, the primary-transferred toner image T is immediately secondary-transferred and conveyed to a fixing device. In the case of transferring a full-color image by superimposing a plurality of colors, the toner image T of each color is transferred. The rotation of the transfer belt 2 and the rotation of the photosensitive drum 1 are synchronized so that the toner images of the respective colors do not shift so as to exactly match in the primary transfer portion.

In the secondary transfer section, a voltage (transfer voltage) having the same polarity as that of the toner image is applied to the electrode roll 26 which is pressed against the backup roll 22 disposed opposite to the bias roll 3 via the transfer belt 2. Then, the toner image is transferred onto the recording paper 41 by electrostatic repulsion.

When such a system is used, the surface resistivity of the transfer belt 2 as an intermediate transfer member is 1 × 1
0 ⁸ preferably set to Ω~1 × 10 ¹³ Ω. The resistivity is 1
If it is lower than × 10 ⁸ Ω, the transfer current increases, and electric charge is injected into the toner to cause image disorder. Also, 1 ×
If it is higher than 10 ¹³ Ω, the transfer current may be too small to transfer the toner.

Further, the intermediate transfer member circulates in a machine in various shapes (as shown in FIG. 1, generally, a plurality of roll-shaped members are combined and stretched). In this case, repeated bending at the roll portion is added to the resin during use, and cracking or breaking may occur if the resin has poor toughness. However, the semiconductive member for electrophotography of the present invention is excellent in durability because the decomposition of the thermoplastic resin as a raw material is suppressed at the time of production. Accordingly, even when used as an intermediate transfer member, the above-described occurrence of cracks and breaks can be prevented. Such characteristics are necessary even when used for other purposes. However, according to the semiconductive member for electrophotography of the present invention, such characteristics can be sufficiently exhibited.

[0042]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the invention is limited thereto.

(Example 1) Carbon black (manufactured by Regal 400R CABOT) was used as a polycarbonate resin.
18 phr of pH 3.5 and 3.5 wt% of volatile matter were added, and 1.5 phr of a phosphorus-based deterioration inhibitor (ADEKA STAB PEP36 manufactured by Asahi Denka) were added, and a masterbatch was prepared at 260 ° C. using a twin-screw extruder. The obtained masterbatch was produced at 260 ° C. by a uniaxial extruder to produce a φ168 belt-shaped semiconductive member for electrophotography. The surface resistivity of the obtained electroconductive semiconductive member was 1.4 × 10 4
¹² Ω. The surface resistivity was measured by using Hiresta HT450 manufactured by Diamond Instruments (the same applies hereinafter).

Example 2 Carbon black (Special Black 4 degu) was used as a polyester resin.
ssa pH 3, volatile matter 14% by weight), 14 phr,
Phosphorus-based deterioration inhibitor (ADK STAB PEP manufactured by Asahi Denka Kogyo)
36) was added in an amount of 1.0 phr, and 2
A master batch was prepared at 60 ° C. The obtained masterbatch was subjected to φ16
A belt-shaped semiconductive member for electrophotography of No. 8 was produced.
The surface resistivity of the obtained electroconductive semiconductive member was 7.
It was 5 × 10 ¹¹ Ω.

Example 3 10 phr of carbon black (Printex 150T degussa, pH 4, volatile content: 10% by weight) and 0.3 phr of a phenol / sulfur-based mixed deterioration inhibitor (Adeka Stab AO85 manufactured by Asahi Denka Kogyo) were added to a polyamide resin. The mixture was added to prepare a master batch at 280 ° C. using a twin-screw extruder. The obtained masterbatch is heated at 280 ° C. with a single screw extruder.
Thus, a belt-shaped semiconductive member for electrophotography of φ168 was produced. The surface resistivity of the obtained electroconductive semiconductive member was 9.3 × 10 ¹¹ Ω.

(Example 4) Carbon black (manufactured by Regal 400R CABOT, pH: 10 g) was used as the polyester resin.
3.5 phr, 3.5% by weight of volatile matter) and 14 phr of phosphorus-based deterioration inhibitor (Adeka Stab PEP36, manufactured by Asahi Denka).
1 phr was added, and a master batch was prepared at 260 ° C. using a twin screw extruder. The obtained master batch is 1
A belt-shaped semiconductive member for electrophotography of φ168 was produced at 260 ° C. by an axial extruder. The surface resistivity of the obtained electroconductive semiconductive member was 3.9 × 10 ¹¹ Ω.
Met.

(Comparative Example 1) Car polycarbonate resin
Bon Black (manufactured by Regal 400R CABOT)
18 phr (pH 3.5, volatile content 3.5% by weight)
And masterbatch at 260 ° C using a twin screw extruder
Was prepared. Single-screw extruder for the obtained masterbatch
, At 260 ° C, φ168 belt-shaped electrophotograph
A semiconductive member for use was produced. The resulting semiconductive material for electrophotography
The surface resistivity of the conductive member is 1.4 × 10 ¹²Ω.

Comparative Example 2 Carbon black (Special Black 4 degu) was used as a polyester resin.
14 phr (ssa; pH 3, volatile matter: 14% by weight) was added, and a master batch was prepared at 260 ° C. using a twin-screw extruder. The obtained masterbatch was produced at 260 ° C. by a uniaxial extruder to produce a φ168 belt-shaped semiconductive member for electrophotography. The surface resistivity of the obtained electroconductive semiconductive member was 7.5 × 10 ¹¹ Ω.

Comparative Example 3 10 phr of carbon black (pH4, manufactured by Printex 150T degussa, pH: 10% by weight) was added to a polyamide resin.
A master batch was prepared at 280 ° C. using an axial extruder. The obtained masterbatch was produced at 280 ° C. using a uniaxial extruder to produce a φ168 belt-shaped semiconductive member for electrophotography. The surface resistivity of the obtained electroconductive semiconductive member was 9.3 × 10 ¹¹ Ω.

(Comparative Example 4) Carbon black (manufactured by Regal 400R CABOT) was used as a polycarbonate resin.
14 phr of pH 3.5 and 3.5% by weight of volatile components and 8 phr of a phosphorus-based deterioration inhibitor (ADEKA STAB PEP36 manufactured by Asahi Denka) were added, and a masterbatch was prepared at 260 ° C. using a twin-screw extruder. The obtained master batch is 1
A belt-shaped semiconductive member for electrophotography of φ168 was produced at 260 ° C. by an axial extruder. The surface resistivity of the obtained electroconductive semiconductive member was 3.8 × 10 ¹¹ Ω.
Met.

The semiconductive members for electrophotography prepared in Examples 1 to 4 and Comparative Examples 1 to 4 were evaluated for appearance and roll flexibility. The residual amount of the deterioration inhibitor was also investigated.

-Evaluation of Appearance- Each of the cylindrical electrophotographic semiconductive members prepared in Examples 1 to 4 and Comparative Examples 1 to 4 was visually observed.
evaluated. Table 1 shows the results.

-Evaluation of Roll Flexibility- The semiconductive member for cylindrical electrophotography prepared in Examples 1 to 4 and Comparative Examples 1 to 4 was used as an intermediate transfer member (intermediate transfer belt) and 20 mm × from the intermediate transfer member. The strip-shaped sheet 50 cut out to a size of 250 mm was placed on a roll bending tester (diameter of rolls 51a, 51b, 51c: φ28) shown in FIG.
mm), a load of 2.7 N (276 gf) was applied in the direction of the arrow in the drawing, and the rotational speed was set to 160 rpm to evaluate the roll flexibility until the strip-shaped sheet 50 was broken. Table 1 shows the results.

-Residual amount of anti-deterioration agent-The residual amount of anti-deterioration agent was determined by using a Soxhlet extraction device or the like, and measuring 1 g of each electrophotographic semiconductive member sample of Examples 1 to 4 and Comparative Example 4. 300 ml of methanol
The solution was extracted for 8 hours continuously at a heating rate in which methanol was renewed in 3 minutes, and the concentrated solution was analyzed by pyrolysis gas chromatography (HS-40XL manufactured by PerkinElmer + QP-5000 manufactured by Shimadzu Corporation). And the area of the peak caused by the residual deterioration inhibitor. Table 1 shows the results.

[0055]

[Table 1]

As shown in the above evaluation results (Table 1),
In Examples 1 to 3 containing the low residual deterioration inhibitor, the roll flexibility was 100 K rotation or more, but Comparative Examples 1 to 3 containing no low residual deterioration inhibitor showed 25 to 82
It was broken by K rotation. Comparative Example 4 contained a deterioration preventing agent at the time of molding. However, since a large amount of the deterioration preventing agent remained in the semiconductive member for electrophotography, the appearance became powdery, and the evaluation was carried out. Was low.

[0057]

The semiconductive member for electrophotography of the present invention has good appearance and can maintain good durability even when carbon black having high dispersibility is used.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an image forming apparatus when an electrophotographic semiconductive member of the present invention is applied to the image forming apparatus.

FIG. 2 is a schematic configuration diagram of a roll bending tester used for evaluation of roll flexibility.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Photoreceptor drum 2 ... Transfer belt 3 ... Bias roller 4 ... Tray 5, 6, 7, 8 ... Developing device 9 ... Belt cleaner 13 ... Hole 21 , 23, 24 ... belt roller 22 ... backup roller 25 ... conductive roller 26 ... electrode roller 31 ... cleaning blade 41 ... recording paper 42 ... pickup roller 43 ... Feed roller T: Toner image

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G03G 15/02 101 G03G 15/02 101 F-term (Reference) 2H003 BB11 CC04 2H032 BA09 BA18 4F071 AA43 AA50 AA54 AB03 AC11 AC13 AC15 AE05 AF53 AH12 AH16 BA01 BB06 BC07 4J002 CF001 CF061 CF161 CG001 CL001 DA036 EJ047 EV047 EW067 FD037 GQ00

Claims (7)

[Claims] 1. A semiconductive member for electrophotography, comprising at least a thermoplastic resin, carbon black, and a low-residuality deterioration inhibitor of 1000 ppm or less. 2. The semiconductive member for electrophotography according to claim 1, wherein the roll flexibility is 100 K rotation or more. 3. The electroconductive semiconductive material according to claim 1, wherein the low residual deterioration preventing agent comprises at least one of a phosphorus compound, a phenol compound, and a sulfur compound. Sex members. 4. The semiconductive member for electrophotography according to claim 1, wherein the carbon black has a pH of 5 or less and contains a volatile content of 3% by weight or more. 5. The method according to claim 1, wherein the carbon black is added in an amount of 0.
The semiconductive member for electrophotography according to any one of claims 1 to 4, wherein the amount is 5 to 30 phr. 6. The semiconductive member for electrophotography according to claim 5, wherein the amount of the deterioration inhibitor added is 1 to 50% by weight of the amount of the carbon black added. 7. The method for producing a semiconductive member for electrophotography according to claim 1, wherein at least a thermoplastic resin, carbon black, and a low-persistence deterioration inhibitor are mixed, A method for producing a semiconductive member for electrophotography, wherein the composition is melt-kneaded and molded, and the low residual deterioration preventing agent is removed during the melt-kneading or molding.