JP2748120B2 - Electrophotographic photoreceptor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an electrophotographic photosensitive member, and more particularly, to an organic photoconductive electrophotographic photosensitive member, and more particularly to an electrophotographic photosensitive member useful for reversal development.

[Conventional technology]

In the Carlson method electrophotographic copying machine, after uniformly charging the surface of the photoreceptor, the charge is erased imagewise by exposure to form an electrostatic latent image, and the electrostatic latent image is developed with toner. Then, the toner image is transferred and fixed on paper or the like.

On the other hand, the photoreceptor is subjected to removal of adhered toner, static elimination, and surface cleaning, and is repeatedly used for a long time.

Therefore, as an electrophotographic photoreceptor, not only electrophotographic characteristics such as good charging characteristics and sensitivity and small dark decay, but also physical properties such as printing durability, abrasion resistance, and moisture resistance in repeated use. It is also required to have good resistance to ozone generated during corona discharge and ultraviolet light during exposure (environment resistance).

Conventionally, selenium, zinc oxide,
Inorganic photoreceptors having an inorganic photoconductive material such as cadmium sulfide as a main component of the photosensitive layer have been widely used.

In recent years, the carrier (sometimes called electric charge) generation function and the carrier transport function are shared by different materials as the photosensitive layer of the electrophotographic photoreceptor, and a material that exhibits each function is selected from a wide range according to the desired characteristics. However, there is a trend to commercialize an organic photoreceptor having high sensitivity and high durability.

Conventionally, such a function-sharing type organic photoreceptor is mainly used for negative charging, and a thin carrier generating layer is provided on a support as described in JP-A-60-247647, and a relatively thick layer is formed thereon. A configuration is provided in which a carrier transport layer is provided.

Among these layers, the functions required of the carrier transport layer include carrier transport ability, charging ability, mechanical strength of the surface (film strength), and the like. It is a mixture of a low molecular carrier transport material (hereinafter referred to as CTM) and a binder resin.

Conventionally, compounds such as those disclosed in JP-A-61-239248 have been used as CTM, and bisphenol A type polycarbonate resins, acrylic resins, styrene-acrylic resins and the like have been used as binder resins. However
The compatibility between CTM and the binder resin is not sufficient, and there has been a problem that CTM precipitates as a crystal, which becomes a nucleus to cause poor cleaning and cracking defects.

Furthermore, when the compatibility between the CTM and the binder resin is poor, there is a minute portion where the charge is uneven and the potential is not applied locally locally, and this portion is white missing in the case of regular development and black spots in the case of reversal development. There was a problem that appeared.

Furthermore, when the resin and CTM were not tightly packed (package properties), the dark resistance of the photoconductor decreased under high temperature and high humidity, causing problems such as a decrease in density during regular development and fogging during reversal development. .

On the other hand, from the viewpoint of the sensitivity of the photoconductor, there is a combination of an optimal CTM and an optimal carrier-generating substance (hereinafter referred to as CGM).
Problems such as a decrease in sensitivity and a deterioration in repetition characteristics occur.

As a photosensitive layer used in an electrophotographic photosensitive member, for example, the following are known.

(1) A configuration in which a charge generation layer (hereinafter referred to as CGL) made of amorphous selenium or cadmium sulfide and a charge transport layer (hereinafter referred to as CTL) made of poly-N-vinylcarbazole are laminated.

(2) CGL made of amorphous selenium or cadmium sulfide
And CTL containing 2,4,7-trinitro-9-fluorenone
And a layered structure.

(3) A configuration in which CGL comprising a perylene derivative and CTL containing an oxadiazole derivative are laminated (see US Pat. No. 3,871,882).

(4) A configuration in which CGL comprising chlordian blue or methyl scalylium and CTL containing a pyrazoline derivative are laminated (see JP-A-51-90826).

(5) CTL containing CGL comprising amorphous selenium or its alloy and polyarylalkane aromatic amino compound
(Japanese Patent Laid-Open No. 54-80130).

(6) A structure in which CGL containing a perylene derivative and CTL containing a polyarylalkane-based aromatic amino compound are laminated (Japanese Patent Application Laid-Open No. 54-126036). Efforts have been made to obtain an electrophotographic photoreceptor having excellent electrophotographic properties and film strength by using a low molecular weight organic compound as the CTM and using an arbitrary CGM in combination with a polymer binder.

As the binder, it is well known that bisphenol A type polycarbonate represented by the following structural formula exhibits good characteristics in terms of charging characteristics, sensitivity, residual potential, and repetition characteristics.

However, as a result of investigations by the present inventors, the bisphenol A-type polycarbonate has a high polymer crystallinity, and the solution is liable to gel, and becomes unusable in about 1 to 2 days. have. In addition, when a film is formed by coating, crystalline polycarbonate precipitates on the film surface during the formation of the coating film, and a convex portion is apt to be generated. Therefore, the tailing of the coating film occurs, and the yield decreases, or as a photoreceptor, At the time of use, the toner adheres to the protrusions and remains without being cleaned, and image defects due to so-called poor cleaning tend to occur.

When the electrophotographic photosensitive member used as the bisphenol A-type polycarbonate and the binder resin is used as a photosensitive member of an electrophotographic copying machine, the photosensitive layer surface may be scratched by being rubbed with a magnetic brush or a cleaning blade, or the photosensitive layer may be damaged. It has the disadvantage that it wears out gradually.

[Object of the invention]

In view of the above-mentioned drawbacks or problems in the electrophotographic photoreceptor, an object of the present invention is to provide: (1) good compatibility between CTM and a binder without causing cracking; (3) Good potential maintenance, no decrease in maximum density in regular development and no fog increase under high humidity conditions in reversal development,
Another object of the present invention is to provide a high-sensitivity, high-durability electrophotographic photoreceptor which does not cause a decrease in density under high-temperature and high-humidity conditions and which does not cause white spots.

[Configuration of the invention]

An object of the present invention is to provide an electrophotographic photoreceptor in which a plurality of constituent layers including CGL and CTL are laminated on a support, wherein the CGL includes CGM represented by the following general formula (G), and the CTL includes Comprises a CTM represented by the following general formula [T], and at least the CTL contains a polycarbonate having the following general formula [BI] and / or [BII] as a main repeating unit in the composition. Achieved by an electrophotographic photoreceptor.

The titanyl phthalocyanine used as CGM in the present invention is represented by the following general formula [G]; In the formula, X represents a halogen atom that substitutes for a hydrogen atom, an alkyl group, an alkoxy group, an aryloxy group, a nitro group, a cyano group, or a hydroxyl group, and m is an integer of 0-4. Y represents an oxygen atom, a halogen atom, or an alkoxy group;
Represents an integer of 2 to 2.

 X is preferably a hydrogen atom or a methyl group.

Next, specific examples of the titanyl phthalocyanine according to the present invention will be described, but the present invention is not limited thereto.

It is preferable to use the titanyl phthalocyanine after sufficiently pulverizing it to fine particles with a pulverizing apparatus such as a ball mill, a sand mill or an attritor. Examples of the grinding agent at this time include commonly used glass beads, steel beads, and alumina beads.
Grinding aids such as sodium bicarbonate may be used.
When a dispersion medium is required at the time of grinding, a liquid at the temperature at the time of grinding is preferable. For example, 2-ethoxyethanol, diclime, dioxane, tetrahydrofuran,
N, N-dimethylformamide, N-methylpyrrolidone,
Solvents such as pyridine, morpholine and polyethylene glycol which do not promote the change of the crystal form are exemplified.

The titanyl phthalocyanine compound is desirably present in the binder in the form of fine particles of 1 μm or less.
Further, the amount of the titanyl phthalocyanine compound used relative to the binder polymer is usually in the range of 0.2 to 10 parts by weight.

The titanyl phthalocyanines can be synthesized according to a known reaction formula shown below.

Examples of the organic solvent include quinoline, α-chloronaphthalene, β-chlorophthalene, α-methylnaphthalene, methoxynaphthalene, diphenyl ether, diphenylmethane, diphenylethane, ethylene glycol, dialkyl ether, higher aliphatic amine and the like which are inactive to the reaction. A boiling organic solvent is desirable, and the reaction temperature is usually desirably 200 ° C to 300 ° C. In some cases, the reaction proceeds even when heated to 160 ° C. or higher without solvent.

According to the above reaction formula, the obtained titanyl phthalocyanine compound is in the form of PcTiCl ₂ (where Pc represents a phthalocyanine residue).
Are formed as a part and are obtained as a mixture thereof. It can be completely hydrolyzed by treatment with ammonia water (100 ° C.) or the like (see JP-A-59-166959).

As the phthalonitriles as the raw material, as is known, o
-Dicarboxylic acids, phthalic anhydrides, phthalimides, phthalic diamides and the like can also be used as raw materials.

Purification of the titanyl phthalocyanine compound obtained as described above is carried out by sublimation purification, recrystallization purification, treatment with an organic solvent, heat suspension purification with a high boiling point organic solvent, and reprecipitation after dissolving sulfuric acid as in the case of general organic pigments. And a known method such as an alkali washing method. Such purification is intended not only to simply remove impurities, but also to hydrolyze PcTiCl ₂ , and the electrical properties of the phthalocyanine compound obtained by these methods are significantly changed. Therefore, it is preferable to use purified phthalocyanine.

General formula [T] In the formula, R ₁ , R ₂ and X ₁ , X _{2 each} represent a hydrogen atom, an alkyl, aryl, or heterocyclic group which may have a substituent, and X ₁ and X ₂ are condensed A carbocyclic group or a heterocyclic group may be formed, and these rings may have a substituent.

Next, specific examples of the hydrazone compound will be described, but the present invention is not limited thereto.

The hydrazone compounds described above are disclosed in JP-A-57-67940,
No. 7-72148, No. 57-101844, No. 58-134642, No. 59-
It is synthesized by a known method described in Nos. 15251 and 59-15252 and the like.

The polycarbonate resin according to the present invention has the following general formula (B
It has units represented by [I] and [BII] as main repeating units.

General formula (BI) Wherein R ₁ and R ₂ are a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted cycloalkyl group, or a substituted or substituted aryl group, and at least one of R _{1 and} R ₂ is bulky Group.

R ₃ , R ₄ , R ₅ , R ₆ , R ₇ , R ₈ , R ₉ , and R ₁₀ represent a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, or a substituted or unsubstituted cycloalkyl group. Express, the degree of polymerization is 10-50
00, preferably 50-1000. ] General formula [BII] However, in the formula, R ₃ , R ₄ , R ₅ , R ₆ , R ₇ , R ₈ , R ₉ , and R ₁₀ represent the same group as in the above general formula [BI], and Z represents
It represents an atom group necessary for forming an unsubstituted carbon ring or a substituted or unsubstituted heterocyclic ring, and has a polymerization degree of 10 to 5,000, preferably 50 to 1,000. The above degree of polymerization is the number of repeating units.

These carbonate resins improve on the disadvantages of the conventionally used bisphenol A type carbonates, and at least one of the bulky (bulky) R ₁ and R _{2 is} added to the central carbon atom of these polycarbonates.
Are bonded to each other, or a ring formed by the above Z is formed, so that these R ₁ and / or R ₂ or Z effectively prevent the molecular chains of the polycarbonate from being arranged in a specific direction. Therefore, the polycarbonate is not crystallized and the solution does not gel or precipitate on the film surface during the formation of the photosensitive layer, and such as image defects due to a decrease in yield due to abnormal projections and poor cleaning,
Characteristics deterioration can be prevented. These noticeable effects are:
In the general formula [BI], when R ₁ and R ₂ are different from each other or are bonded asymmetrically, the effect is more remarkably exhibited.
In the general formula [BII], the ring formed by Z directly contributes to the above-mentioned remarkable effect.

That is, in the present invention, by using a polycarbonate represented by the general formula (BI) or the general formula (BII) as a binder resin, excellent film properties, charge retention,
An electrophotographic photosensitive member having excellent electrophotographic characteristics such as sensitivity residual potential and exhibiting stable characteristics with little fatigue deterioration even when repeatedly used can be produced.

Further, when used as a photoreceptor, even when rubbed with a magnetic brush or a cleaning blade, the surface of the photosensitive layer is not easily scratched, the abrasion of the photosensitive layer is small, and high printing durability electrophotography without characteristic defects such as poor cleaning. A photoreceptor can be made.

Further, the polycarbonate resin according to the present invention, if necessary, a copolycondensation type polycarbonate containing other repeating units in addition to the repeating units of the general formulas (BI) and (BII), for example, 4,4'- Physical, chemical or electrical properties may be adjusted by using polycarbonate obtained by mixing and co-condensing a small amount of bisphenol A with dihydroxyphenyl-1,1-cyclohexane.

Further, if necessary, other polymers can be mixed and used as long as the effects are not hindered. The mixing ratio at this time is preferably 50% by weight or less of the total binder amount.

Since the binder used in the present invention is a polycarbonate-based binder, it is possible to impart to the photoreceptor the excellent characteristics such as excellent charging performance, repetition characteristics, and printing durability inherent to polycarbonate.

In the polycarbonates represented by the general formula (BI) among the polycarbonates used in the present invention, it is essential that at least one of R ₁ and R ₂ is a bulky group. It is preferable that the number of carbon atoms is 3 or more, and it has a steric hindrance so as to hinder the molecular chain orientation. The following are examples of such bulky groups.

However, R ₁₃ is a hydrogen atom, an alkyl group such as a methyl group, CH _2
p COOR (R is an alkyl group, p ≧ 1) is an alkyl ester group.

(3) an alkyl group represented by —CqH ₂ q ₊₁ (where q ≧ 3); (4) an alkyl ester group represented by CH ₂ rCOOR ₁₄ (where R ₁₄ is an alkyl group and r ≧ 2) When _{one of} R ₁ and R ₂ is a bulky group, the other may be a hydrogen atom or an alkyl group such as a methyl group.

Next, the groups of R _{3 to} R ₁₀ in the general formulas [BI] and [BII] may be hydrogen atoms, halogen atoms, alkyl groups such as methyl groups, and carbocyclic groups such as cyclohexyl groups.

In the polycarbonate represented by the general formula [BII], Z may form a 5- or 6-membered carbon ring or a heterocyclic ring, and examples of such a ring include a cyclohexyl ring and a cyclopentyl ring. And a substituent such as an acetyl group or an acetylamino group may be introduced into a part of the ring.

Specific examples of the repeating unit of the polycarbonate used in the present invention include the following.

: Example repeating unit: The polycarbonate used in the present invention occupies the main component of the binder. Other binder components that may be used in combination include ordinary polycarbonates, and the above-mentioned R ₁ , R ₂ , Z
And a polycarbonate having no.

The polycarbonate is used as a binder for a photosensitive layer (particularly, CTL of a function-separated type photosensitive member, or both of CTL and CGL).

Examples of the binder which may be used in the CGL and the CTL in combination with the polycarbonate used as the above-mentioned binder include the following.

(1) Polyester (2) Methacrylic resin (3) Acrylic resin (4) Polyvinyl chloride (5) Polyvinylidene chloride (6) Polystyrene (7) Polyvinyl acetate (8) Styrene copolymer resin (for example, styrene-butadiene copolymer) (9) acrylonitrile copolymer resin (for example, vinylidene chloride-acrylonitrile copolymer, etc.) (10) vinyl chloride-vinyl acetate copolymer (11) ) Vinyl chloride-vinyl acetate-maleic anhydride copolymer (12) silicone resin (13) silicone-alkyd resin (14) phenolic resin (for example, phenol-formaldehyde resin, cresol-formaldehyde resin,
(15) Styrene-alkyd resin (16) Poly-N-vinyl carbazole (17) Polyvinyl butyral (18) Polyvinyl formal (19) Polyhydroxystyrene These binders may be used alone or as a mixture of two or more. Can be used in combination.

The photoreceptor of the present invention comprises a laminate of CGL2 containing CGM as a main component and CTL3 containing a compound CTM of the present invention as a main component on a conductive support 1 as shown in FIGS. 1 and 2. Is provided. As shown in FIGS. 3 and 4, the photosensitive layer 4 is formed of an intermediate layer 5 provided on the conductive support 1.
May be provided. Thus, when the photosensitive layer 4 has a two-layer structure, an electrophotographic photosensitive member having the best electrophotographic characteristics can be obtained. In the present invention, as shown in FIGS. 5 and 6, the photosensitive layer 4 in which fine particles of CGM 7 are dispersed in the layer 6 containing CTM as a main component is directly or electrically formed on the conductive support 1. , May be provided via the intermediate layer 5.

Further, a protective layer 8 may be provided on the photosensitive layer 4 if necessary.

Here, when the photosensitive layer 4 has a two-layer structure, which of CGL2 and CTL3 is to be the upper layer is determined by whether the charging polarity is selected to be positive or negative. That is, in the case of forming a negatively charged photosensitive layer, it is advantageous to use CTL3 as the upper layer, because CTM in the CTL3 is a substance having a high transport ability to holes.

The CGL2 constituting the two-layered photosensitive layer 4 is formed by the following method directly on the conductive support 1 or CTL3 or on an intermediate layer such as an adhesive layer or a barrier layer as required. can do.

(1) Vacuum evaporation method (2) Method of applying a solution in which CGM is dissolved in an appropriate solvent (3) CGM is made into fine particles in a dispersion medium by a ball mill, sand grinder, or the like, and mixed and dispersed with a binder as necessary. A method of applying a dispersion obtained by the above method.

That is, specifically, a vapor deposition method such as vacuum deposition, sputtering, or CVD, or a coating method such as dipping, spray, blade, or roll method is optionally used.

The thickness of the CGL2 thus formed is 0.01 μm to
It is preferably 5 μm, more preferably 0.05 μm to 3 μm.
μm.

The thickness of CTL3 can be changed as necessary,
It is preferred that it is between μm and 30 μm. The composition ratio of this CTL3 is 0.1 to 1 part by weight of CTM of the present invention, and the binder is 0.1 to
Although it is preferable to use 5 parts by weight, when forming the photosensitive layer 4 in which fine-grained CGM is dispersed, it is preferable to use a binder in a range of 5 parts by weight or less based on 1 part by weight of CGM.

In the case where the CGL is of the binder-dispersed type, the binder is preferably used in an amount of 5 parts by weight or less based on 1 part by weight of CGM.

The layer structure of the photoreceptor of the present invention has a laminated structure and a single-layer structure as described above, but the surface layer CTL, CGL, any one or a plurality of single-layer photosensitive layers or protective layers,
One or more kinds of electron accepting substances can be contained for the purpose of improving sensitivity, residual potential, reducing fatigue upon repeated use, and the like.

The intermediate layer functions as an adhesive layer or a barrier layer. In addition to the binder resin, for example, polyvinyl alcohol, ethyl cellulose, carboxymethyl cellulose, casein, or the like is used.

As the conductive support 1 used for the configuration of the electrophotographic photoreceptor of the present invention, the following are mainly used,
It is not limited by these.

(1) A metal plate such as an aluminum plate or a stainless steel plate, and a drum-shaped plate.

(2) A thin metal layer such as aluminum, palladium, or gold is provided on a support such as paper or plastic film by lamination or vapor deposition. (3) A conductive polymer or oxidized material is provided on a support such as paper or plastic film. A layer provided with a layer of a conductive compound such as indium or tin oxide by coating or vapor deposition.

The photoreceptor of the present invention has the above-described configuration, and has excellent charging characteristics, sensitivity characteristics, and image forming characteristics, as will be apparent from the examples described later. In particular, even when subjected to a repetitive transfer type electrophotographic system, it has little fatigue deterioration and excellent durability.

(Examples) Examples of the present invention will be specifically described below, but the embodiments of the present invention are not limited thereto.

Example 1 CGL dispersion I of the formulation shown in Table 1-1 below as the CGL of the photoreceptor
It was created.

Table 1-1 CGM Dispersion I Titanyl Frotocyanin (Compound Example G11) 3 parts by weight Polyethylene resin (manufactured by Toyobo Co., Ltd., "Vylon 200" 1 part by weight Chloroform 210 parts by weight The dispersion of the above formulation was dispersed by ultrasonic waves for 2 hours. U-
CG with a thickness of about 0.7μm, applied to an 80φ aluminum tube for Bix1550
Form L.

Next, a CTL solution shown in Table 1-2 was applied thereon to prepare a CTL.

Table 1-2 CTM Solution I 5 parts by weight of hydrazone compound T-10 of Exemplified Compound BII-2 Bisphenol Z-type polycarbonate (Iupilon Z-200 manufactured by Mitsubishi Gas Chemical Co., Ltd.) 5 parts by weight Chloroform 65 parts by weight CTL dried for 15 hours
Was formed.

 The photoreceptor thus obtained is referred to as Sample 1.

Examples 2 to 4 Comparative Example (1) CGL is the same as Sample 1. The CTL solution is a mixed system of Iupilon Z-200 and bisphenol A type polycarbonate (Panlite K-1300 manufactured by Teijin Chemicals Ltd.), and the ratio is shown in the table below. Other conditions are the same as sample 1.

Examples 5-9 CGL is the same as sample 1. The same as Sample 1 except that the following hydrazone compound was used instead of the hydrazone compound T-10 of the CTM solution I.

The photoreceptors thus obtained were sequentially sampled 5, 6, 7,
8 and 9.

Sample 5 Hydrazone Compound T-156 T-167 T-178 T-189 T-19 Example 10 A CGM dispersion having the formulation shown in Table 2-1 below was prepared as the CGL of the photoreceptor.

Table 2-1 CGM dispersion 2 Titanyl phthalocyanine (compound NoG12) 3 parts by weight Polyester resin (Toyobo Co., Ltd. "Vylon 200" 1 part by weight Chloroform 200 parts by weight)
-Apply to 80mm aluminum tube for Bix1550,
Form CGL.

Next, a CTL film was formed thereon similarly to Sample 1. The photoconductor thus obtained is referred to as Sample 10.

Example 11 The CGL of the photoreceptor was the same as that of Sample 1, except that the binder of CTM solution I was replaced with a polycarbonate resin having the structural unit represented by Example BI-2 as a repeating unit instead of bisphenol Z-type polycarbonate. Same as 1. This is designated as Sample 11.

Example 12 A photoreceptor sample 12 was obtained in the same manner as in Example 1 except that the ratio of CTM and binder in CTL was changed as shown in Table 3-1 below.

Comparative Example (2) Sample 1 was used except that CGL was the same as sample 1 as a comparative photoreceptor, and an acrylic resin (Dianal BR-85 manufactured by Mitsubishi Rayon Co., Ltd.) was used instead of bisphenol Z type polycarbonate of CTM liquid 1-1. Same as. The photoreceptor thus obtained is referred to as Comparative Sample (2).

Comparative Example (3) CGL was the same as Sample 1, and the CTL composition was changed as shown in Table 4-1.

The obtained sample is designated as Comparative Sample (3).

[Evaluation 1] The obtained photoconductor was converted to a Konica U-Bix1550 modified machine (light source 780).
Table 5 shows the surface potential at the developing device position when the laser light source was turned on and off using a semiconductor laser with an output of 20 mW.
(Adjust the grid potential to make VH constant) As is clear from the table, Samples 1 to 12 have high sensitivity.

Comparative samples (1) and (3) have relatively good sensitivity, while comparative sample (2) has low sensitivity.

[Evaluation 2] An image was displayed on the remodeled machine. Table 6 shows the results of measuring the black background occupancy of the solid black image at this time using an image analyzer (Sakura Area Duck, manufactured by Konica Corporation).

The black occupancy of the samples 1 to 12 is good, but the comparative samples (1) to (3) are extremely low.

[Evaluation 3] Using the remodeling machine used in Evaluation 2 above, image evaluation and drum evaluation after repeatedly outputting 100000 images were performed. The image was evaluated by visually observing the image, and was evaluated as x when there was cleaning failure, o when no cleaning occurred, and drum evaluation was evaluated as x when the photoreceptor was visually observed and cracks did not occur. . Table 7 shows the results.

Samples 1 to 12 have good cleaning properties and cracking resistance, but the comparative samples are poor.

[Evaluation 4] After adjusting the modified machine used in Evaluation 3 to VH = 600V at 25 ° C 60%, VH and image when the modified machine is placed in the environment of 33 ° C and 80% RH without changing the grid voltage Concentration DL of black part of sample
Is shown in Table 8. For the measurement of DL, an image density measurement device (manufactured by Konica Corporation, model PDA-65) was used for a solid black background.

In Samples 1 to 12, the VH did not decrease and the solid black was firm. On the other hand, in the comparative sample, the VH decreased and the solid black density was low.

[Brief description of the drawings]

1 to 6 are cross-sectional views each showing an example of the mechanical configuration of the photoconductor of the present invention. DESCRIPTION OF SYMBOLS 1 ... Conductive support 2 ... Carrier generating layer 3 ... Carrier transporting layer 4 ... Photosensitive layer 5 ... Intermediate layer 6 ... Layer containing carrier transporting substance 7 ... Carrier generating substance 8 ... Protective layer

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshiaki Takei 2970 Ishikawacho, Hachioji-shi, Tokyo Konica Corporation Examiner Kenji Hara (56) References JP-A-1-142658 (JP, A) JP-A-63 JP-198068 (JP, A) JP-A-62-67094 (JP, A) JP-A-62-272272 (JP, A) JP-A-63-57670 (JP, A) JP-A-61-109056 (JP, A) JP-A-59-15252 (JP, A) JP-A-54-150128 (JP, A) JP-A-62-965 (JP, A) JP-A-62-14158 (JP, A)

Claims (1)

(57) [Claims] 1. An electrophotographic photoreceptor comprising a support and a plurality of constituent layers including a charge generating layer and a charge transport layer laminated on a support, wherein the charge generating layer has a charge generating material represented by the following general formula [G]. Wherein the charge transport layer contains a charge transport material represented by the following general formula [T], and at least the charge transport layer has the following general formula [BI] and / or [BII] as a main repeating unit. An electrophotographic photosensitive member comprising a polycarbonate having the same. General formula [G] [In the formula, X represents a halogen atom which substitutes for a hydrogen atom, an alkyl group, an alkoxy group, an aryloxy group, a nitro group, a cyano group, or a hydroxyl group, and m is an integer of 0 to 4. Y represents an oxygen atom, a halogen atom, or an alkoxy group;
Represents an integer of ２2. General formula [T] [In the formula, R ₁ , R ₂ and X ₁ , X ₂ represent a hydrogen atom, an alkyl, aryl, or a heterocyclic group which may have a substituent, and X ₁ and X ₂ are condensed A carbocyclic group or a heterocyclic group may be formed, and those rings may have a substituent. ] General formula [BI] [Wherein, R ₁ and R ₂ are a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted cycloalkyl group, or a substituted or unsubstituted aryl group, and at least one of R _{1 and} R ₂ It is a bulky group. R ₃ , R ₄ , R ₅ , R ₆ , R ₇ , R ₈ , R ₉ , and R ₁₀ represent a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, or a substituted or unsubstituted cycloalkyl group. , Polymerization degree is 10 ~ 5000
It is. ] General formula [BII] [Wherein, R ₃ , R ₄ , R ₅ , R ₆ , R ₇ , R ₈ , R ₉ , and R ₁₀ represent a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, or a substituted or unsubstituted cyclo group. Represents an alkyl group, Z represents a group of atoms necessary to form a substituted or unsubstituted carbon ring, or a substituted or unsubstituted heterocyclic ring, the polymerization degree is 10 to 5000
It is. ]