JP2001042659A - Electrically conductive belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure a resistance which nearly does not tend to depend on environmental changes, such as a temperature or humidity change as well as to make the intrasurface resistance of an electrically conductive belt stabilized by using a high molecular polymer composition containing an antistatic agent having boron atoms. SOLUTION: This electrically conductive belt 6 comprises a high molecular polymer composition, containing an antistatic agent having boron atoms. When a 300 V voltage is applied repeatedly 200 times to the belt 6 for 10 sec each, while suspending application for 3 sec, the initial volume resistance R1 of the belt and the volume resistance R2 after the repeated application have a relation 0<=LogR2-LogR1<=1.5. When Log(R2/R1)<1.5, an image becomes stabilized, the dependency of resistance on an environmental change lowers and the image is hardly affected by the ambient temperature and humidity. The relation between the volume resistance Rs at 23 deg.C and 50% relative humidity and the volume resistance Rh at 30 deg.C and 90% relative humidity preferably satisfies the expression 0<=LogRs-LogRh<=2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conductive belt, for example, a member related to antistatic, mainly an electronic / electric field,
The present invention relates to a conductive belt used in the automobile field and the like. More specifically, the present invention relates to a conductive belt suitably used for a copying machine in the field of electrophotography, a laser beam printer, a latent image holding member such as a facsimile, a latent image transfer member, etc., though not particularly limited thereto.

[0002]

2. Description of the Related Art As a conductive belt for an electrophotographic member, an organic antistatic agent, a conductive filler, and the like are kneaded into a polymer composition to form a conductive polymer composition. A belt formed by molding is used. Specific examples of the electrophotographic member include, but are not particularly limited to, an intermediate transfer belt, a transfer belt, and a belt for a photoconductor substrate.

FIG. 1 is a schematic diagram showing an intermediate transfer device using an intermediate transfer belt. The surface of the photosensitive drum 1 is uniformly charged by the charger 3, and an electrostatic latent image corresponding to the image is formed by the exposure device 2. This electrostatic latent image is developed by the developing device 5 to become a toner image. The toner image is transferred to the intermediate transfer belt 6 by the electrostatic transfer device 10. Intermediate transfer belt 6
The upper toner image is transferred to the recording paper 11 by the pressing roller 12. Residual toner on the photosensitive drum is cleaner 4
To prepare for the next charging cycle.

[0004] An intermediate transfer belt 6 composed of an endless belt is supported by a plurality of rollers 7, 8, 9 in contact with the inner surface thereof, and is used for transferring a toner image and conveying a recording sheet. At least one of the plurality of rollers is a driving roller connected to a driving source such as a motor, and the other is a driven roller that rotates freely as the endless belt moves.

[0005]

In a belt formed by kneading an organic antistatic agent into a high-molecular polymer composition, the resistance distribution in the belt surface is stable, but it can be obtained at high temperature, high humidity and low temperature. When the humidity is low, there is a problem that the resistance value greatly changes.
In addition, when a polymer composition obtained by kneading an organic antistatic agent by melt kneading or the like is molded by extrusion molding or the like having a long residence time, the antistatic agent is decomposed, resulting in a poor appearance of the molded product. There was a problem. In addition, carbon black,
A belt formed by kneading a conductive filler such as graphite, zinc oxide, or indium oxide by melt-kneading or the like has a problem in that the distribution of resistance values in the belt surface varies.

SUMMARY OF THE INVENTION An object of the present invention is to provide a conductive belt which stabilizes the in-plane resistance value of the conductive belt and has a resistance value which is hardly dependent on environmental changes such as temperature and humidity.

[0007]

Means for Solving the Problems The conductive belt of the present invention is composed of a polymer composition containing an antistatic agent having a boron atom, and a voltage of 300 V is repeatedly applied 200 times (specifically, One cycle is to apply 300 V for 10 seconds and stop for 3 seconds, and this cycle is repeated for 200 cycles.) When the initial volume resistance before application is R ₁ and the volume resistance after application is R ₂ , the following equation is obtained. It is characterized by satisfying.

0 ≦ LogR ₂ −LogR ₁ ≦ 1.5 (1) The inventor of the present invention has obtained a conductive property obtained by adding an antistatic agent characterized by having a boron atom to a polymer composition. The polymer composition was formed into a belt by molding, and the in-plane resistance value distribution was measured. As a result, it was found that it was almost uniform. In addition, it has been found that the resistance value is almost the same as the standard value even when exposed to environmental changes of high temperature and high humidity and low temperature and low humidity.

That is, in a belt obtained by molding a conductive polymer composition obtained by adding a polymer charge-transfer type conjugate having a structural formula having a boron atom to a polymer composition, a resistance value is obtained. It has been found that a belt having a stable distribution and a low resistance value of the environment can be obtained. This is a polymer charge created by reacting a hydroxyalkylamine with an organoboron polymer compound in which boron atoms are regularly incorporated into the molecule, while maintaining a semipolar bonding structure with the polymer composition. By combining the transferable conjugate, instead of expressing semiconductivity by bleeding to the surface like a normal antistatic agent, semiconductivity is imparted to the polymer composition from inside the base resin. It is thought that it is.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail.

(1) High-molecular polymer composition The high-molecular polymer composition constituting the conductive belt of the present invention is not particularly limited. For example, when melt-kneading, an antistatic agent is used. In order to prevent thermal decomposition, a thermoplastic resin having a melting point of 250 ° C. or less is preferable. Examples of such a high-molecular polymer composition include, for example, an ethylene copolymer composition comprising a polyolefin resin such as polyethylene, polypropylene, vinyl chloride, acrylate and methacrylate, and a polyfluorinated resin such as polyfluorinated resin. And vinylidene.

A polymer composition having a melting point exceeding 250 ° C. can be used by dissolving it in a solvent or the like and adding an antistatic agent to the solution. Examples of such a polymer composition include polyimide, polyethersulfone, and polycarbonate.
A high-molecular polymer composition having a melting point of 250 ° C. or lower can also be used as long as it has a solvent-soluble property. Further, as the polymer compositions described above, one kind or a mixture of two or more kinds can be used.

Preferably, a polyolefin-based resin is preferred from the viewpoint of processability and cost. Examples of the polyolefin-based resin include polypropylene, polyethylene, and ethylene-based copolymer. As the ethylene copolymer, 2 to 30% by weight of ethylene produced by high-pressure radical polymerization is used.
Ethylene copolymers comprising acrylates and / or methacrylates (hereinafter referred to as (meth) acrylates) are preferred. Here, the content of the (meth) acrylic acid ester is based on the total amount with ethylene.

As the (meth) acrylic acid ester, an alkyl ester of acrylic acid or methacrylic acid, particularly a C ₁ -C ₂₀ alkyl, is suitable. Here, "alkyl" is intended to include "aralkyl" (in that case, the above-mentioned carbon number includes an aryl moiety). Specifically, for example, methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate,
2-ethylhexyl acrylate, methyl methacrylate,
Ethyl methacrylate, propyl methacrylate, butyl methacrylate, 2-ethylhexyl methacrylate, lauryl methacrylate, tridecyl methacrylate, stearyl methacrylate, cyclohexyl methacrylate, benzyl methacrylate, and the like can be used.

These can be used as a mixture.

Among them, those having 4 or less carbon atoms, such as methyl acrylate, ethyl acrylate, propyl acrylate, n-butyl acrylate, and methyl methacrylate, are preferable, and methyl acrylate and ethyl acrylate are particularly preferable. It is.

The content of the (meth) acrylate in the ethylene copolymer is 2 to 30% by weight, preferably 2 to 18% by weight. If the content of the (meth) acrylate is less than the above range, the desired electrical properties cannot be obtained, and if the content is more than the above range, the film processability is inferior. If necessary, a small amount (generally 30% by weight or less based on the total amount of the ethylene-based copolymer) of the third monomer may be further copolymerized.

The MFR (melt flow rate) of the ethylene copolymer is preferably from 0.5 to 30 g / 10 min, particularly preferably from 0.8 to 30 g, from the viewpoint of moldability of a film or the like.
15 g / 10 min.

The ethylene copolymer comprising ethylene and (meth) acrylate is, for example, a monomer mixture of ethylene and (meth) acrylate of 50 to 30%.
It is produced by a method in which polymerization conditions are maintained at a high pressure of 00 atm and a high temperature of 150 to 300 ° C., and at the same time, a free-radical polymerization initiator such as peroxide is added.
An inert solvent may be used in the polymerization system, or substantially bulk polymerization may be performed.

The ethylene copolymer as an example of the polymer composition constituting the conductive belt of the present invention includes:
A random copolymer comprising ethylene and an α-olefin is also suitable.

The α-olefin constituting the random copolymer is an α-olefin having 4 to 10 carbon atoms, specifically, butene-1, pentene-1, hexene-1, 4-methylpentene-1, and octene-. 1, decene-1 and the like are suitable, and these can be used as a mixture. The proportion of both is 99-75% by weight of ethylene, C ₄ -C ₁₀ α-
The olefin is preferably in the range of 1 to 25% by weight, but if necessary, a third monomer in a smaller amount than the α-olefin may be copolymerized.

The contents of ethylene and α-olefin are based on the contents of both.

The density of the ethylene random copolymer is 0.910 to 0.940 g / cm ³ , preferably 0.9 to 0.940 g / cm ³ .
15 to 0.930 g / cm ³ . 0.910 density
If the ratio is less than 1, heat sealing strength is inferior and stickiness is likely to occur. On the other hand, if the density exceeds 0.940, the high-performance antistatic effect, which is the object of the present invention, cannot be obtained. In order for the density of the copolymer to be in the above range, the amount of the α-olefin component is usually in the range of 1 to 25% by weight, preferably 2 to 10% by weight.

The melt flow rate of the ethylene random copolymer is 0.1 to 50 g / 10 minutes, preferably 1 to 50 g / 10 minutes.
It is 25 g / 10 min, more preferably 5 to 20 g / 10 min. If the melt flow rate is lower than the above range, the flowability is poor and workability is poor.

Such an ethylene random copolymer is
It can be manufactured by any manufacturing method. For example, as the catalyst, silica, a transition metal oxide-based catalyst such as a chromium oxide catalyst using alumina as a carrier, and IV-VIII such as titanium halide or vanadium halide.
Group transition metal halides and organoaluminum-magnesium complexes such as alkylaluminum-magnesium complexes and alkylalkoxyaluminum-magnesium complexes; and organic aluminums such as alkylaluminum or alkylaluminum chlorides.
Using a coordination catalyst comprising a combination with a group III-III organometallic compound, suspension polymerization, solution polymerization, gas phase polymerization,
It is manufactured by various processes such as high-pressure polymerization in which polymerization is performed at 000 to 3000 atm and 150 to 300 ° C.

When used as a member for electrophotography, flame retardancy and water repellency are required. In such a case, a fluoropolymer composition is preferred. In particular, as the fluoropolymer composition, polyvinylidene fluoride having a low melting point is preferable. The polyvinylidene fluoride preferably has a tensile yield point strength of 100 kg / cm ² or more. The polyvinylidene fluoride may be a homopolymer of vinylidene fluoride or a copolymer of 50 mol% or more of vinylidene fluoride and the remaining amount of a monomer copolymerizable therewith. The monomer copolymerizable with vinylidene fluoride is not limited as long as it can be literally copolymerized with vinylidene fluoride, for example, ethylene, olefins such as propylene, vinyl chloride, chlorine-substituted vinyl compounds such as vinylidene chloride, Fluorine-substituted olefins and the like are preferable, and especially fluorine-substituted olefins such as tetrafluoroethylene, vinyl fluoride, trifluoroethylene and propylene hexafluoride are preferable.

These polyvinylidene fluorides can be produced by any of the known vinylidene fluoride polymerization methods such as emulsion polymerization and suspension polymerization.

The intrinsic viscosity of the polyvinylidene fluoride is suitably in the range of 0.4 to 1.5, preferably 0.7 to 1.2. If the intrinsic viscosity is less than 0.4, the strength of the obtained molded article is low, and if it is more than 1.5, the moldability is difficult unless other solvents, plasticizers, etc. are used in combination.

(2) Antistatic agent having boron atom As the antistatic agent used in the present invention, one or more semipolar organic boron polymer compounds represented by the general formula I, and a hydroxyl group A polymer charge transfer conjugate which is a reaction product of one or more tertiary amines having a total of 5 to 82 carbon atoms having at least one and having a ratio of one boron atom to one basic nitrogen atom Is preferred.

[0030]

Embedded image

The semipolar organic boron compound can be produced, for example, by the following method (a) or (b).

Method (a): 1 mol of boric acid or a boric acid triester of a lower alcohol having 4 or less carbon atoms per 1 mol of one or more compounds represented by the following general formula II: Alternatively, the esterification reaction is performed by reacting 0.5 mol of boric anhydride.

[0033]

Embedded image

Method (b): Polyetherification reaction of one or more diols having a total carbon number of 206 or less, preferably 10 to 100, containing a di (glycerin) borate residue or a di (glycerin) borate residue in the middle. Or one or two or more of them
3 to 84 carbon atoms, preferably 8 to 84 carbon atoms,
(Hereinafter, referred to as a predetermined dicarboxylic acid) or an ester of a lower alcohol having 4 or less carbon atoms with a predetermined dicarboxylic acid, or a halide of a predetermined dicarboxylic acid or 4 to 15, preferably 8 to 1 carbon atoms.
5 or more diisocyanates (hereinafter, referred to as predetermined diisocyanates) are reacted in a total of 1 mol.

One or more semipolar organoboron polymer compounds prepared in this manner are combined with a tertiary amine having a total of 5 to 82, preferably 5 to 30 carbon atoms having at least one hydroxyl group (hereinafter referred to as a tertiary amine). , A predetermined tertiary amine) is charged into a closed or open-type reactor at a ratio designed to provide one boron atom to one basic nitrogen atom. , Under normal pressure, 2
By reacting at 0 to 200C, preferably at 50 to 150C, the above antistatic agent is produced. At that time, when a polar solvent such as alcohol, ether, and ketone coexists, the reaction can be performed more easily.

The raw materials for deriving the polymer charge transfer type conjugate and the predetermined semipolar organoboron polymer compound as an intermediate thereof are as follows.

Examples of the compound represented by the general formula II, which is a raw material of the method (a) for deriving the above semipolar organoboron polymer compound, include diglycerin, di (glycerin) malonate, di (glycerin) maleate, Di (glycerin)
Adipate, di (glycerin) terephthalate, di (glycerin) dodecanate, poly (9 mol) oxyethylene di (glycerin ether), di (glycerin) tolylene dicarbamate, di (glycerin) methylenebis (4
-Phenylcarbamate) and the like. On the other hand, as the predetermined dicarboxylic acid in the method (b), for example, malonic acid, maleic acid, succinic acid, adipic acid,
Sebacic acid, phthalic acid, terephthalic acid, dodecane diacid, dimer acid derived from linoleic acid, dodecyl maleic acid, dodecenyl maleic acid, octadecyl maleic acid, octadecenyl maleic acid, having an average degree of polymerization of 20 Maleic acid linking a polybutenyl group and the like, and as the predetermined diisocyanate, for example,
Examples thereof include ethylene diisocyanate, hexamethylene diisocyanate, tolylene diisocyanate, and methylene bis (4-phenyl isocyanate).

The predetermined tertiary amine to be reacted with the semipolar organic boron polymer compound includes, for example, diethylhydroxymethylamine, dimethyl 2-hydroxypropylamine, methyldi (2-hydroxyethyl) amine,
Tri (2-hydroxyethyl) amine, hydroxymethyldi (2-hydroxyethyl) amine, dibenzyl 2-
Examples include hydroxypropylamine, cyclohexyldi (2-hydroxyethyl) amine, ethylene oxide (1 to 25 mol) adduct of di (hexadecyl) amine, and propylene oxide (1 to 26 mol) adduct of monobutylamine.

In connection with the present invention, the type of the amine raw material to be reacted with the predetermined semipolar organic boron polymer compound other than the predetermined tertiary amine, that is, the primary or secondary amine, is the charge transfer. Since the type conjugate is not successfully made, and the resulting product is also an unstable compound,
There is a key to the development and retention of conductivity, and therefore, it is impossible to impart permanent antistatic properties to vinylidene fluoride resin.

When a tertiary amine having no hydroxyl group is used, it is not possible to connect the generated polymer charge transfer conjugates by multiple hydrogen bonds,
Therefore, in order to increase the mobility of each chain, it causes a change in the aggregate state in the base material,
It is not preferable because the charge leakage property becomes insufficient.

(3) Additional Components The polymer composition used for the conductive belt includes fillers, heat stabilizers, ultraviolet absorbers, lubricants, flame retardants, pigments,
Additives such as dyes, resin modifiers, compatibilizers and the like can also be provided.

As fillers, calcium carbonate (heavy and soft), talc, mica, alumina, aluminum hydroxide, magnesium hydroxide, barium sulfate, zinc oxide, zeolite, wollastonite, diatomaceous earth, glass fiber, glass Examples include beads, bentonite, montmorillonite, asbestos, hollow glass beads, molybdenum disulfide, wood flour, rice hulls, organometallic compounds, and organometallic salts.

(4) Method of Forming into a Belt Shape The above resin composition is prepared by, for example, mixing a necessary component with a single screw extruder,
It is kneaded using a usual kneader such as a twin-screw extruder, a multi-screw extruder, a Banbury mixer, a roll, a Brabender, a plastograph, and a kneader, and is then compounded into pellets. In such a case, it is also possible to supply each component directly to a molding machine, and perform molding while kneading the composition with the molding machine.

The method of forming the conductive belt is not particularly limited, but may be injection molding for injecting a molten resin, extrusion molding for extruding the molten resin, compression molding for compressing the molten resin, or a solvent. Rotational molding, in which the melted resin is adhered to the inside of a cylindrical rotating body, and molding, and casting, in which the melted resin is poured into a mold and solidified, are used. Films, sheets, and the like obtained by these methods can be joined to form a belt. Further, a seamless belt having no seam can be formed by using any of the methods described above. Considering practical performance and productivity, a seamless belt formed by melt extrusion using a mold having an annular extrusion opening is preferable.

(5) Resistance value of belt The resistance value of the belt is not particularly limited, but when used as a conductive belt for electrophotography,
The following are preferred.

In the case of the intermediate transfer belt and the transfer belt, the surface resistance is 10 ⁶ to 10 ¹⁶ Ω / □, and the volume resistance is 10 ⁶ to 10 ¹⁶ Ω · cm. In the case of the photosensitive member base belt, the surface resistance is 10 ⁰ to 10 ^8. Ω / □, volume resistance value of 10 ⁰ to 10 ⁹ Ω · cm The conductive belt of the present invention has an initial cycle when a voltage of 300 V is applied for 10 seconds and stopped for 3 seconds as one cycle. The volume resistance R ₁ and the applied volume resistance R ₂ have the following relationship.

0 ≦ LogR ₂ −LogR ₁ ≦ 1.5 That is, Log (R ₂ / R ₁ ) is in the range of 0 to 1.5.
When this value is smaller than 1.5, the image becomes stable when used in an electrophotographic apparatus, and the dependence of the resistance value on the environmental change becomes large, and the image is hardly affected by the temperature and humidity of the environment. .

In the present invention, in particular, in order to make it less susceptible to environmental changes, the relationship between the volume resistance value Rs at a temperature of 23 ° C. and a humidity of 50% RH and the volume resistance value Rh at a temperature of 30 ° C. and a humidity of 90% RH. Preferably satisfies the following expression.

0 ≦ LogRs−LogRh ≦ 2 In the present invention, when the maximum value Rmax and the minimum value Rmin of the volume resistance value in the belt satisfy the following relational expression, the image unevenness of the electrophotographic apparatus is extremely small. Become.

0 ≦ LogRmax−LogRmin ≦ 1 (6) Thickness of conductive belt The thickness of the conductive belt used for electrophotography is 50 μm.
m to 1000 μm, preferably 100 μm to 7 μm.
It is more preferably at most 00 μm. When the thickness is less than 50 μm, the belt is easily stretched, which causes a problem such as uneven color of an image. In addition, the charged voltage is insufficient, and it is not possible to apply a voltage sufficient to provide a charge required for transfer. On the other hand, if the thickness exceeds 1000 μm, it becomes difficult to perform flexible deformation, so that a small-diameter roll cannot be driven at a uniform speed, resulting in image transfer deviation. Furthermore, since the capacitance is small, it is not possible to apply the electric charge required for transfer unless a high voltage is applied, which not only increases the cost and size of the power supply device but also causes discharge between peripheral device parts. Problem arises.

[0051]

Next, the present invention will be described in detail with reference to examples and comparative examples. In the following Examples and Comparative Examples, the polymer composition was polyvinylidene fluoride (P
VDF). Specific PVDF and other materials used are as follows.

PVDF1: Kychem 710 manufactured by Atochem Co., Ltd. Tensile yield stress 500 kg / cm ² Flexural modulus 15000 kg / cm ² MFR (temperature 230 ° C., load 2.16 kg) 12 g / 10 min PVDF2: Kynar 720 manufactured by Atochem Co., Ltd. Tensile yield stress 500 kg / cm ² flexural modulus 17000kg / cm ² MFR (temperature 230 ° C., load of 2.16 kg) 4g / 10min modifier: MODIPER® A1200 (manufactured by NOF Corporation) LDPE over preparative -g-PMMA type (composition ratio LDPE / PMMA = 70/30) Boron-containing antistatic agent Antistatic agent 1: The following structural formula was used.

[0053]

Embedded image

Antistatic agent 2: having the following structural formula

[0055]

Embedded image

General antistatic agent Antistatic agent 3: Tertiary amine-based antistatic agent Armostat 410 (manufactured by Lion) Lithium perchlorate LiCLO ₄ Polyethylene glycol: molecular weight 20,000 Carbon black: acetylene black, trade name Denka Black (Electric) DBP oil absorption 180ml / 100g, primary particle size 40
nm, pH 9 In Examples and Comparative Examples, various numerical values were measured as follows.

(Surface resistance value) Unit: Ω / □ Measuring device: Hiresta IP (manufactured by Mitsubishi Chemical Corporation) Measurement terminal: HA terminal (manufactured by Mitsubishi Chemical Corporation) Applied voltage: 500 V Measurement time: 10 seconds value Terminal pressing load: 1 kgf Measurement site: Cut and open the seamless belt of the sample to 500 x 340 mm, and measure at 15 locations. Record the maximum value, minimum value, and geometric mean of measured values (Volume resistance value) Unit according to JIS K6911; Ω · cm Measuring device: RA8340A (manufactured by Advantest Co., Ltd.) Applied voltage: 100 V Measurement time: 10 seconds value Terminal pressing load ; 4 kgf measurement site; Cut out the seamless belt of the sample, make it 500 × 340 mm, select 15 places and measure. The maximum value, minimum value, and geometric mean of the measured values are recorded. (Repeatability) One cycle of applying 300 V for 10 seconds and stopping for 3 seconds is repeated for 200 cycles. The resistance measurement device is as described above.

(Evaluation of belt surface appearance) Judged visually. If it is smooth, it is evaluated as O, and if it is a pinhole, it is evaluated as X.

Examples 1 to 3 and Comparative Examples 1 to 3 Each component was melt-kneaded using a twin-screw kneader at the compounding amounts shown in Table 1 to obtain a pellet-shaped resin composition. Next, this resin composition is extruded in the form of a molten tube below the annular die by an extruder having a diameter of 40 mm with an annular die. The extruded molten tube was brought into contact with the outer surface of a cooling mandrel mounted on the same axis as the annular die via a support rod and cooled and solidified to obtain a 150 μm-thick seamless belt. Next, the seamless belt was taken out while being held in a circular shape by a core installed in the seamless belt and a roll installed outside. Tables 1 and 2 show the properties of the obtained seamless belt.

[0060]

[Table 1]

[0061]

[Table 2]

As shown in Tables 1 and 2, all of the examples of the present invention have a small volume resistance value distribution, good belt surface appearance, and excellent environmental and repetition characteristics.

On the other hand, in the case of Comparative Example 1, the distribution of volume resistivity was large, the appearance of the belt surface was poor, and the repetition characteristics were poor. Comparative Example 2 has poor environmental characteristics (volume) and poor repetition characteristics. Comparative Example 3 has a poor volume resistance value distribution and poor environmental characteristics.

[0064]

As described above, according to the present invention, there is provided a conductive belt whose resistance is stable and whose characteristics are hardly affected by environmental changes such as temperature and humidity.

[Brief description of the drawings]

FIG. 1 is a schematic side view of an intermediate transfer device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Photosensitive drum 2 Exposure device 3 Charger 4 Cleaner 5 Developing device 6 Intermediate transfer belt 7, 8, 9 Roller 10 Electrostatic transfer machine 11 Recording paper 12 Press roller

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H032 BA09 2H035 CB06 4F213 AB13 AB16A AE03 AG16 WA06 WB02

Claims (8)

[Claims] 1. A high-molecular-weight polymer composition containing an antistatic agent having a boron atom.
A conductive belt which satisfies the following expression when the initial volume resistance value before and after application is R ₁ and the volume resistance value after application is R ₂ . 0 ≦ LogR ₂ −LogR ₁ ≦ 1.5 (1) 2. A maximum value Rmax of a volume resistance value in a belt.
2. The conductive belt according to claim 1, wherein the minimum value Rmin satisfies the following relational expression. 0 ≦ LogRmax−LogRmin ≦ 1 (2) 3. The relationship between a volume resistance Rs at a temperature of 23 ° C. and a humidity of 50% RH and a volume resistance Rh at a temperature of 30 ° C. and a humidity of 90% RH satisfy the following expression. 3. The conductive belt according to 2. 0 ≦ LogRs−LogRh ≦ 2 (3) 4. An antistatic agent having a boron atom comprising one or more semipolar organic boron polymer compounds represented by the general formula I and a total of 5 to 82 carbon atoms having at least one hydroxyl group. One or two of the tertiary amines
4. The polymer charge transfer conjugate according to claim 1, which is a reaction product of at least one species and one boron atom to one basic nitrogen atom. Conductive belt. Embedded image 5. The conductive belt according to claim 1, wherein the conductive belt has a volume resistivity of 10 ⁰ to 10 ¹⁶ Ω · cm. 6. The conductive belt according to claim 1, wherein the conductive belt has a surface resistance of 10 ⁰ to 10 ¹⁶ Ω / □. 7. The conductive belt according to claim 1, wherein the conductive belt is a seamless belt having no joint. 8. The conductive belt according to claim 1, wherein the high molecular weight polymer composition is a fluoropolymer composition.