JP3519508B2 - Polyesteramide and electrophotographic photoreceptor using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] TECHNICAL FIELD The present invention relates to a polyester
And use it as a binder resin to form a photosensitive layer
To an electrophotographic photoreceptor. [0002] 2. Description of the Related Art In a recent electrophotographic photosensitive member, a lamination
Type electrophotographic photoreceptor, i.e., the photosensitive layer
Charge generation layer (CGL) for generating charges and transporting charges
Lamination having at least two layers with a charge transport layer (CTL)
Type organic electrophotographic photoreceptor (OPC) and photosensitive layer
Raw material and charge transport material dispersed in binder resin
A single-layer type electrophotographic photoreceptor having a single layer has been proposed and used.
Have been used. Charge transport layer and layered electrophotographic photoreceptor
And as a binder resin for the photosensitive layer of a single-layer type electrophotographic photoreceptor
Are both 2,2-bis (4-hydroxyphenyl)
Le) propane (hereinafter abbreviated as bisphenol-A),
1,1-bis (4-hydroxyphenyl) cyclohexa
(Hereinafter abbreviated as bisphenol-Z), 2,2-bi
(3-methyl-4-hydroxyphenyl) propane
(Hereinafter abbreviated as bisphenol-C) as raw material
Recarbonate resins are widely used. Bispheno
Polyurethane-A-based polycarbonate resin is charged
Good compatibility with the feed material
Electrical characteristics of photoreceptor with photosensitive layer made of resin
Is good and the mechanical strength is relatively large.
Have signs. [0003] However, as a binder resin,
Using polycarbonate resin made from phenol-A
When the photosensitive layer is formed, the following problems
It turned out that there was a point. (1) At the time of photoreceptor preparation, use
Depending on the solvent used, the coating solution may gel or the photosensitive layer
Crystallization may occur in the formed binder resin.
In these gelled and crystallized areas, light attenuation
And the charge remains as a residual potential, resulting in poor image quality.
Appears as (2) In the case of a normal negatively charged electrophotographic photosensitive member,
Polycarbonate resin made from Nord-A
Since the photosensitive layer has poor adhesion to the undercoat layer, it is easy to peel off.
Or the surface hardness is insufficient.
However, there is a disadvantage that the printing life is shortened due to wear. here
The undercoat layer means the charge generation in the case of the laminated photoreceptor.
The raw layer refers to the conductive substrate for single-layer and reverse-layer photoconductors.
You. Also, a polyaryre using bisphenol-A as a raw material.
Had the same problem. [0004] In order to solve such a problem, charge transport
Special monomers are co-polymerized to improve compatibility with quality
An example using a combined polycarbonate is disclosed in JP-A-4-32.
0420, JP-A-5-222181, JP-A-5-222181
JP-A-5-230202, JP-A-6-56982
Information. Bisphenol-C as raw material
Polycarbonate resin is generally bisphenol
Better wear resistance than polycarbonate made from -Z
It is generally known that electrophotographic characteristics are
There is the problem of not being minutes. Also, bisphenol
Polycarbonate made from -Z is the current organic electron
Widely used as a binder resin for photoreceptors,
Higher performance and longer life of copiers and laser printers
Further wear resistance as a requirement for binder resin
The demand for improvement is increasing. [0005] SUMMARY OF THE INVENTION In view of the above situation,
The object of the present invention is to prepare a photosensitive layer for an electrophotographic photosensitive member.
The coating liquid does not gel or crystallize,
In addition, the photosensitive layer and the undercoat layer have excellent adhesion and abrasion resistance
Photosensitive layer can be formed over a long period of time.
Electrophotography that can maintain good electrophotographic properties even when used
The provision of a polyester amide from which a photoreceptor can be obtained,
And an electron having the above excellent characteristics using the same
Photographic photoreceptor. [0006] Means for Solving the Problems The present inventors have proposed such a method.
As a result of intensive research to solve the problem, the feeling of electrophotography
As a binder resin for forming the photosensitive layer of the photoconductor,
Specified polyesteramides containing phenyl units
The electrophotographic photoreceptor that was
And arrived at the present invention. That is, the gist of the present invention is as follows.On conductive substrate
In an electrophotographic photoreceptor having a photosensitive layer formed on
The resin for the binder to be formed isThe following equation (1) and equation
It comprises the structural unit represented by (2),
And the molar fraction of the structural unit represented by the formula (2) is 0.05 ≦
[(2) / {(1) + (2)}] ≦0.20Satisfied,
1.0 g / dl dissolved in tetrachloroethane
The liquid has an inherent viscosity (ηinh.) At 25 ° C. of 0.
25 to 1.00.
Is a midIt is an electrophotographic photosensitive member. [0008] Embedded image [0009] Embedded image [Wherein X is a single bond, an oxygen atom, a sulfur atom
, Alkylene, alkylidene, phenylalkyl
Selected from the group consisting of den and cycloalkylene groups;
Is a benzene ring, biphenyl, naphthalene ring, aliphatic carbon
R is selected from the group consisting of a hydride group and a cyclic hydrocarbon group;
₁, R_Two, R_ThreeAnd R_FourAre each independently a hydrogen atom or halogen
Selected from the group consisting of carbon atoms and hydrocarbon groups. ] [0011] [0012] BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
Used as a binder for the photosensitive layer of the electrophotographic photosensitive member of the present invention
Polyester amides are represented by formulas (1) and (2)
Which are represented by the formulas (1) and (2).
Is less than or equal to 0.05 ≦ [(2) /
{(1) + (2)}] ≦ 0.30, preferably 0.10
≦ [(2) / {(1) + (2)}] ≦ 0.20.
The molar fraction of the structural unit represented by the formula (2) is less than 0.05
The surface hardness of the polyester amide resin
No effect is exhibited, and the effect of extending the life of the electrophotographic photoreceptor
It is difficult to obtain fruit. The molar fraction of the structural unit represented by the formula (2) is
If it is more than 0.30, the polyester amide
During manufacture, as the molecular weight of the polyesteramide increases
Precipitates due to reduced solubility in polymerization solvent and cannot be manufactured
Sometimes. Even if it can be manufactured, make a photoconductor
Preparation of a coating solution for
Of electrophotographic properties due to increased water absorption
There is. Furthermore, polyester amide tetrachloride
At 25 ° C of a 1g / dl concentration solution using roethane as a solvent
Inherent viscosity (ηinh.) Is 0.25 to 1.
00, preferably 0.3 to 0.8. Inherent
If the viscosity is less than 0.25, the mechanical strength is low and the binder
The surface strength of the resin layer is insufficient, and
The printing life may be shortened. On the other hand, inherent viscosity
Exceeds 1.00, the solution viscosity of the polyesteramide becomes
Rise, making it difficult to manufacture photoconductors by the solution coating method.
There is. Formula (1) for polyesteramide
Concretely the dihydric phenol component to constitute the
Illustratively, bis (4-hydroxyphenyl) methane,
1,1-bis (4-hydroxyphenyl) ethane, bis
(4-methyl-2-hydroxyphenyl) methane, bis
(3,5-dimethyl-4-hydroxyphenyl) meta
, Bisphenol-Z, 2,2-bis (4-hydroxy
(Ciphenyl) -4-methylpentane, bisphenol-
A, 2,2-bis (3,5-dimethyl-4-hydroxy
Phenyl) propane, 1,1-bis (4-hydroxyf
Enyl) -1-phenylethane, 1,1-bis (4-h
(Doxyphenyl) -2-ethylhexane, 2,2-bi
(3-phenyl-4-hydroxyphenyl) propa
1,1-bis (3-methyl-4-hydroxyphenyl)
G) methane, 4,4'-biphenol, 2,2-bis
(4-hydroxyphenyl) butane, 1,1-bis (4
-Hydroxyphenyl) -2-methylpropane, bis
(4-hydroxyphenyl) phenylmethane, 2,2-
Bis (4-hydroxyphenyl) octane, 1,1-bi
(3-methyl-4-hydroxyphenyl) cyclohexyl
Sun, 2,2-bis (3-allyl-4-hydroxyphene
Nyl) propane, 2,2-bis (3-isopropyl-4)
-Hydroxyphenyl) propane, 2,2-bis (3-
tert-butyl-4-hydroxyphenyl) propa
2,2-bis (3-sec-butyl-4-hydroxy)
Cyphenyl) propane, bisphenol floren,
1,1-bis (2-methyl-4-hydroxy-5-te
rt-butylphenyl) -2-methylpropane, 4,
4 '-[1,4-phenylene-bis (2-propylide
) -Bis (3-methyl-4-hydroxyphenyl)
)), 1,1-bis (3-phenyl-4-hydroxy
Phenyl) cyclohexane, 4,4'-dihydroxy
Phenyl ether, Bis (2-hydroxyphenyl) methane,
2,4'-methylenebisphenol, bis (3-methyl
-4-hydroxyphenyl) methane, 1,1-bis (4
-Hydroxyphenyl) propane, 1,1-bis (2-
(Hydroxy-5-methylphenyl) ethane, 1,1-bi
(4-hydroxyphenyl) -3-methyl-butane,
Bis (2-hydroxy-3,5-dimethylphenyl) meth
Tan, 1,1-bis (4-hydroxyphenyl) cyclo
Pentane, 1,1-bis (3-methyl-4-hydroxy
Phenyl) cyclopentane, 3,3-bis (4-hydro
(Xyphenyl) pentane, 3,3-bis (3-methyl-
4-hydroxyphenyl) pentane, 3,3-bis
(3,5-dimethyl-4-hydroxyphenyl) penta
2,2-bis (2-hydroxy-3,5-dimethyl
Phenyl) propane, 2,2-bis (4-hydroxyf
Enyl) nonane, 1,1-bis (3-methyl-4-hydrido)
Roxyphenyl) -1-phenylethane, 1,1-bis
(3,5-dimethyl-4-hydroxyphenyl) cyclo
Hexane, 2,2-bis (4-hydroxyphenyl) de
Can, 1,1-bis (4-hydroxyphenyl) deca
Bis (2-hydroxy-3-tert-butyl-5)
-Methylphenyl) methane, bis (4-hydroxyphen)
Nyl) diphenylmethane, terpene diphenol, 1,
1-bis (3-tert-butyl-4-hydroxyphene
Nyl) cyclohexane, 1,1-bis (2-methyl-4
-Hydroxy-5-tert-butylphenyl) -2-
Methylpropane, 2,2-bis (3-cyclohexyl-
4-hydroxyphenyl) propane, bis (3,5-di
tert-butyl-4-hydroxyphenyl) methane,
Bis (3,5-disec-butyl-4-hydroxyphene
Nyl) methane, 1,1-bis (3-cyclohexyl-4)
-Hydroxyphenyl) cyclohexane, 1,1-bis
(2-Hydroxy-3,5-ditert-butylphenyl)
Ru) ethane, bis (3-nonyl-4-hydroxyphenyl)
Le) methane, 2,2-bis (3,5-ditert-butyl)
4-Hydroxyphenyl) propane, bis (2-h
Droxy-3,5-ditert-butyl-6-methylfur
Enyl) methane, 1,1-bis (3-phenyl-4-phenyl)
(Doxyphenyl) -1-phenylethane, 4,4-bi
S (4-hydroxyphenyl) pentanoic acid, α, α'-
Bis (4-hydroxyphenyl) acetic acid butyl ester,
Bis (3-fluoro-4-hydroxyphenyl) meta
1,1-bis (2-hydroxy-5-fluorophene)
Nil) methane, 2,2-bis (4-hydroxyphenyl)
) -1,1,1,3,3,3-hexafluoropropa
, 2,2-bis (3-fluoro-4-hydro
(Xyphenyl) propane, 1,1-bis (3-fluoro
-4-hydroxyphenyl) -1-phenylmethane,
1,1-bis (3-fluoro-4-hydroxyphenyl
L) -1- (p-fluorophenyl) methane, 1,1-
Bis (4-hydroxyphenyl) -1- (p-fluoro
Phenyl) methane, 2,2-bis (3-chloro-4-h
Droxy-5-methylphenyl) propane, 2,2-bi
(3,5-dichloro-4-hydroxyphenyl) pro
Bread, 2,2-bis (3-chloro-4-hydroxyphene
Nyl) propane, 1,1-bis (3,5-dibromo-4)
-Hydroxyphenyl) methane, 2,2-bis (3,5
-Dibromo-4-hydroxyphenyl) propane, 2,
2-bis (3-nitro-4-hydroxyphenyl) pro
Bread, 3,3'-dimethyl-4,4'-biphenol,
3,3 ', 5,5'-tetramethyl-4,4'-biphe
Knol, 3,3 ', 5,5'-tetra-tert-butyl
-4,4'-biphenol, bis (4-hydroxy
Enyl) ketone, 3,3'-difluoro-4,4'-bi
Phenol, 3,3 ', 5,5'-tetrafluoro-
4,4'-biphenol, bis (4-hydroxyphenyl)
B) dimethylsilane, bis (4-hydroxyphenyl)
Sulfone, bis (3-methyl-4-hydroxyphenyl)
L) sulfone, bis (3,5-dimethyl-4-hydroxy)
(Ciphenyl) sulfone, bis (3,5-dibromo-4-)
Hydroxyphenyl) sulfone, bis (4-hydroxy
Phenyl) thioether, bis (3-methyl-4-hydrid)
Loxyphenyl) ether, bis (3-methyl-4-h)
Droxyphenyl) thioether, bis (3,5-dimethyl)
Tyl-4-hydroxyphenyl) ether, bis (3,
5-dimethyl-4-hydroxyphenyl) thioate
1,1-bis (2,3,5-trimethyl-4-hydr
Roxyphenyl) -1-phenylmethane, 2,2-bis
(4-hydroxyphenyl) dodecane, 2,2-bis
(3-methyl-4-hydroxyphenyl) dodecane,
2,2-bis (3,5-dimethyl-4-hydroxyphene
Nyl) dodecane, 1,1-bis (3-tert-butyl)
-4-hydroxyphenyl) -1-phenylethane, 1,1-bis (3,5-ditert-butyl)
4-hydroxyphenyl) -1-phenylethane,
1,1-bis (2-methyl-4-hydroxy-5-cycle
Rohexylphenyl) -2-methylpropane, 1,1-
Bis (2-hydroxy-3,5-ditert-butylf
Enyl) ethane, 2,2-bis (4-hydroxyphenyl)
M) propanoic acid methyl ester, 2,2-bis (4-h
(Droxyphenyl) propanoic acid ethyl ester, Isachi
Bisphenol, isatin biscresol, 2,
2 ', 3,3', 5,5'-hexamethyl-4,4'-
Biphenol, bis (2-hydroxyphenyl) meta
, 2,4'-methylenebisphenol, 1,2-bis
(4-hydroxyphenyl) ethane, 2- (4-hydro
(Xyphenyl) -2- (2-hydroxyphenyl) pro
Bread, bis (2-hydroxy-3-allylphenyl) meth
Tan, 1,1-bis (2-hydroxy-3,5-dimethyl
Ruphenyl) -2-methylpropane, 1,1-bis (2
-Hydroxy-5-tert-butylphenyl) eta
Bis (2-hydroxy-5-phenylphenyl) methan
Tan, 1,1-bis (2-methyl-4-hydroxy-5
-Tert-butylphenyl) butane, bis (2-methyl)
4-hydroxy-5-cyclohexylphenyl) me
Tan, 2,2-bis (4-hydroxyphenyl) penta
Decane, 2,2-bis (3-methyl-4-hydroxyf
Enyl) pentadecane, 2,2-bis (3,5-dimethyl)
Ru-4-hydroxyphenyl) pentadecane, 1,2-
Bis (3,5-ditert-butyl-4-hydroxyphenyl)
Enyl) ethane, bis (2-hydroxy-3,5-di-t)
tert-butylphenyl) methane, 2,2-bis (3-
Styryl-4-hydroxyphenyl) propane, 1,1
-Bis (4-hydroxyphenyl) -1- (p-nitro
Phenyl) ethane, bis (3,5-difluoro-4-h
Droxyphenyl) methane, bis (3,5-difluoro)
-4-hydroxyphenyl) -1-phenylmethane,
(3,5-difluoro-4-hydroxyphenyl) di
Phenylmethane, bis (3-fluoro-4-hydroxy
Phenyl) diphenylmethane, 2,2-bis (3-chloro
(R-4-hydroxyphenyl) propane, 3,3 ',
5,5'-tetratert-butyl-2,2'-biphe
Knol, 2,2'-diallyl-4,4'-biphenol
1,1-bis (4-hydroxyphenyl) -3,3
-Dimethyl-5-methyl-cyclohexane, 1,1-bi
(4-hydroxyphenyl) -3,3-dimethyl-
5,5-dimethyl-cyclohexane, 1,1-bis (4
-Hydroxyphenyl) -3,3-dimethyl-4-methyl
Ru-cyclohexane, 1,1-bis (4-hydroxy
Enyl) -3,3-dimethyl-5-ethyl-cyclohexyl
Sun, 1,1-bis (4-hydroxyphenyl) -3,
3-dimethyl-5-methyl-cyclopentane, 1,1-
Bis (3,5-dimethyl-4-hydroxyphenyl)-
3,3-dimethyl-5-methyl-cyclohexane, 1,1-bis (3,5-diphenyl-4-
(Hydroxyphenyl) -3,3-dimethyl-5-methyl
-Cyclohexane, 1,1-bis (3-methyl-4-h
(Droxyphenyl) -3,3-dimethyl-5-methyl-
Cyclohexane, 1,1-bis (3-phenyl-4-h
(Droxyphenyl) -3,3-dimethyl-5-methyl-
Cyclohexane, 1,1-bis (3,5-dichloro-4
-Hydroxyphenyl) -3,3-dimethyl-5-methyl
Le-cyclohexane, 1,1-bis (3,5-dibromo
-4-hydroxyphenyl) -3,3-dimethyl-5-
Methyl-cyclohexane, resorcinol, hydroxy
Non, 1,2-dihydroxybenzene and the like,
These may be used alone or as a mixture of two or more.
May be used. Among them, preferred divalent phenol
Examples include bisphenol-A and bisphenol-C.
Can be The formula in the polyesteramide of the present invention
Divalent amine component for constituting the moiety represented by (2)
For example, 4,4′-diaminobiphenyl
, 3,3'-dimethoxy-4,4'-diaminobiphe
Nyl, 3,3'-dichloro-4,4'-diaminobiphe
Nildihydrochloride, 3,3'-dimethoxy-
4,4'-diaminobiphenyl dihydrochloride,
3,3'-dimethyl-4,4'-diaminobiphenyl,
2,2'-dimethyl-4,4'-diaminobiphenyldi
Hydrochloride, 3,3'-dimethyl-4,4'-
Diaminobiphenyl-6,6-disulfonic acid, 2,2 '
-Dichloro-4,4'-diamino-5,5'-dimethoxy
Sibiphenyl, 2,2 ', 5,5'-tetrachloro-
4,4'-diaminobiphenyl and the like,
One type may be used, or two or more types may be mixed and used.
Is also good. Among them, 4,4'-diaminobiphenyl, 3,
3'-dimethyl-4,4'-diaminobiphenyl is preferred
Used for Further, the following divalent amine compound is copolymerized
Can be combined. For example, bis (3-chloro-4-
Aminophenyl) methane, bis (3-methyl-4-amido)
Nophenyl) methane, 3,4'-diaminodiphenyle
-Tel, bis (4-aminophenyl) ether, bis
(4-aminophenyl) sulfone, bis [4- (3-A
Minophenoxy) phenyl] sulfone, 2,2-bis
(4-aminophenyl) propane, 2,2-bis (3-
Methyl-4-aminophenyl) propane, 2,2-bis
[4- (4-aminophenoxy) phenylpropane,
[4- (4-aminophenoxy) phenyl] sulfo
4,4'-bis (4-aminophenoxy) biphenyl
Bis [4- (4-aminophenoxy) phenyl] e
-Tel, 2,2-bis [4- (4-aminophenoxy)
Phenyl] propane, 1,1-bis [4- (4-amino
Phenoxy) phenyl] ethane, bis [4- (4-amido)
Nophenoxy) phenyl] methane, 2,2-bis [4-
(4-aminophenoxy) phenyl] hexafluorop
Lopan, 1,4-bis (4-aminophenoxy) benze
, 1,3- (4-aminophenoxy) benzene, bis
(4-aminophenyl) sulfide, bis (3-amino
Phenyl) sulfone, 4,4'diaminobenzanili
, 9,10-bis (4-aminophenyl) anthrace
9,9-bis (4-aminophenyl) florene,
o-Tolidine sulfone and the like. Formula (1) in polyesteramide and
Illustrates a divalent carboxylic acid component for constituting formula (2)
Then, terephthalic acid, isophthalic acid, orthophthalic
Acid, 2,6-naphthalenedicarboxylic acid, diphenic acid,
4,4'-dicarboxydiphenyl ether, bis (p
-Carboxyphenyl) alkane, 4,4'-dicarbo
Xyphenyl sulfone, oxalic acid, malonic acid, succinic
Acids, aliphatic dicarboxylic acids such as adipic acid, etc.
You. These divalent carboxylic acids may be used alone.
Alternatively, two or more kinds may be used in combination. Among these
Examples of the divalent carboxylic acid preferably used in
Talic acid and isophthalic acid are exemplified. Further, the polyesteramide of the present invention must be
It is not necessary to be a linear resin, and a polyfunctional monomer
It may be copolymerized to obtain a branched polyesteramide.
Multifunctional used in the production of branched polyesteramides
As an example of the monomer, tris (4-hydroxyphene)
Nyl) methane, 4,4 '-[1- [4- [1- (4-h
Droxyphenyl) -1-methylethyl] phenyl] d
Tylidene] bisphenol, 2,3,4,4'-tetra
Hydroxybenzophenone, 4- [bis (4-hydroxy
Cyphenyl) methyl] -2-methoxyphenol, tri
(3-methyl-4-hydroxyphenyl) methane, 4
-[Bis (3-methyl-4-hydroxyphenyl) methyl
2-methoxyphenol, 4- [bis (3,5-
Dimethyl-4-hydroxyphenyl) methyl] -2-me
Toxiphenol, 1,1,1-tris (4-hydroxy
Cyphenyl) ethane, 1,1,1-tris (3-methyl
-4-hydroxyphenyl) ethane, 1,1,1-tri
(3,5-dimethyl-4-hydroxyphenyl) eta
Tris (3-methyl-4-hydroxyphenyl) methan
Tan, tris (3,5-dimethyl-4-hydroxyphene)
Nyl) methane, 2,6-bis [(2-hydroxy-5-
Methylphenyl) methyl] -4-methylphenol, 4
-[Bis (3,5-dimethyl-4-hydroxyphenyl)
Ru) methyl] -1,2-dihydroxybenzene, 2-
[Bis (2-methyl-4-hydroxy-5-cyclohexene
Silphenyl) methyl] -phenol, 4- [bis (2
-Methyl-4-hydroxy-5-cyclohexylphenyi
L) methyl] -1,2-dihydroxybenzene, 4-meth
Tylphenyl-1,2,3-trihydroxybenzene,
4-[(4-hydroxyphenyl) methyl] -1,2,2
3-trihydroxybenzene, 4- [1- (4-hydro
Xyphenyl) -1-methyl-ethyl] -1,3-dihi
Droxybenzene, 4-[(3,5-dimethyl-4-h
Droxyphenyl) methyl] -1,2,3-trihydro
Xybenzene, 1,4-bis [1-bis (3,4-dihi
Droxyphenyl) -1-methyl-ethyl] benzene,
1,4-bis [1-bis (2,3,4-trihydroxy
Phenyl) -1-methyl-ethyl] benzene, 2,4-
Bis [(4-hydroxyphenyl) methyl] -1,3-
Dihydroxybenzene, 2- [bis (3-methyl-4-
(Hydroxyphenyl) methyl] phenol, 4- [bis
(3-methyl-4-hydroxyphenyl) methyl] fe
And 2- [bis (2-methyl-4-hydroxyphene)
Nyl) methyl] phenol, 4- [bis (3-methyl-
4-hydroxyphenyl) methyl] -1,2-dihydro
Xybenzene, 4- [bis (4-hydroxyphenyl)
Methyl] -2-ethoxyphenol, 2- [bis (2,
3-dimethyl-4-hydroxyphenyl) methyl] fe
Nor, 4- [bis (3,5-dimethyl-4-hydroxy
Cyphenyl) methyl] phenol, 3- [bis (3,5
-Dimethyl-4-hydroxyphenyl) methyl] pheno
2- (bis (2-hydroxy-3,6-dimethyl)
Phenyl) methyl] phenol, 4- [bis (2-hydr
Roxy-3,6-dimethylphenyl) methyl] pheno
, 4- [bis (3,5-dimethyl-4-hydroxyf
Enyl) methyl] -2-methoxyphenol, 3,6-
[Bis (3,5-dimethyl-4-hydroxyphenyl)
Methyl] -1,2-dihydroxybenzene, 4,6-
[Bis (3,5-dimethyl-4-hydroxyphenyl)
Methyl] -1,2,3-trihydroxybenzene, 2-
[Bis (2,3,6-trimethyl-4-hydroxyphene)
Nyl) methyl] phenol, 2- [bis (2,3,5-
Trimethyl-4-hydroxyphenyl) methyl] pheno
, 3- [bis (2,3,5-trimethyl-4-hydr)
Roxyphenyl) methyl] phenol, 4- [bis
(2,3,5-trimethyl-4-hydroxyphenyl)
Methyl] phenol, 4- [bis (2,3,5-trime
Tyl-4-hydroxyphenyl) methyl] -1,2-di
Hydroxybenzene, 3- [bis (2-methyl-4-h
Droxy-5-cyclohexylphenyl) methyl] fe
And 4- [bis (2-methyl-4-hydroxy-5
-Cyclohexylphenyl) methyl] phenol, 4-
[Bis (2-methyl-4-hydroxy-5-cyclohexene
Silphenyl) methyl] -2-methoxyphenol,
2,4,6- [tris (4-hydroxyphenyl) methyl
L] -1,3-dihydroxybenzene, 1,1,2,2
-Tetra (3-methyl-4-hydroxyphenyl) eta
1,1,2,2-tetra (3,5-dimethyl-4-
Hydroxyphenyl) ethane, 1,4-[[bis (4-
Hydroxyphenyl) methyl]] benzene, 1,4-di
[Bis (3-methyl-4-hydroxyphenyl) methyl
L] benzene, 1,4-di [bis (3,5-dimethyl-
4-hydroxyphenyl) methyl] benzene, 4-
[1,1-bis (4-hydroxyphenyl) ethyl] a
Niline, (2,4-dihydroxyphenyl) (4-hydr
Roxyphenyl) ketone, 2- [bis (4-hydroxy
Phenyl) methyl] phenol, 1,3,3-tri (4
-Hydroxyphenyl) butane, etc.
And one or more of these can be used. The above-mentioned polyester amide may be an ordinary aromatic amide.
It can be manufactured similarly to polyester. For example,
Ingredients for constituting the ester amide in an organic solvent
Solution polymerization method (A. Conix Ind. En)
g. Ohchem. 51 147959, Tokiko 37-
No. 5599), for constituting polyesteramide
Polymerisation method in which the components are heated in the presence of acetic anhydride,
The component for constituting the ester amide is diallyl carb
Melt polymerization method in which heating is carried out in the presence of
No. 6299), dissolved in an organic solvent that is incompatible with water.
Dissolved in divalent carboxylic acid halide and aqueous alkali solution
Divalent phenol (and polyhydric phenol) and
Interfacial polymerization method by mixing with divalent diamine (WMEA
RECKSON J. Poly. Sci. XL399
1959, Japanese Patent Publication No. 40-1959) and the like.
The polyesteramide used in the present invention is as described above.
Although it can be produced by a known method, particularly an interfacial polymerization method
The one manufactured by the above is preferably used. The production method by the interfacial polymerization method will be described in more detail.
To illustrate, for example, dihydric phenol and dihydric amine
Preparing an aqueous alkali solution of the nomer, followed by a polymerization catalyst,
For example, tertiary amines such as trimethylamine and triethylamine
Amine, trimethylbenzylammonium chloride
And tributylbenzylammonium chloride
A quaternary ammonium salt or the like is added. On the other hand, compatible with water
Solvent that does not dissolve polyester amide, eg
For example, methylene chloride, 1,2-dichloroethane, chloropho
Chlorinated solvents such as
Divalent to aromatic hydrocarbons such as
The solution in which the carboxylic acid halide is dissolved is
Mix with liquid. Next, for 1 hour to 5 hours at a temperature of 25 ° C. or less.
By performing the reaction while stirring for a
Stemamide (copolymer) can be obtained. here
Alkali that can be used include sodium hydroxide and
Potassium hydroxide and the like. For controlling the molecular weight of the polyesteramide
The method is not limited to the production method described above,
It can be performed by adding a monofunctional substance. Say here
Monofunctional substances used as molecular weight regulators include
Enol, cresol, p-tert-butylphenol
Monohydric phenols such as benzoyl chloride, meta
Sulfonyl chloride and phenyl chloroformate
Any monovalent acid chlorides may be mentioned. In the present invention, the polyester
A single-layer or multi-layer photoreceptor (and reverse-layer photo
Any type of binder resin for the photosensitive layer
Although it is possible to use it for an electrophotographic photoreceptor,
Vine for charge transport layer of laminated photoreceptor
It is particularly preferred to use as a binder resin. The present invention
Range that does not impair the effects of the present invention in photoreceptors
Mix other binder resin with above polyester amide
It can also be used in such a way. Also, oxidation prevention
It is also possible to add a terminating agent and other additives. The electroconductivity of the electrophotographic photosensitive member of the present invention
As the substrate material, various known materials can be used.
Wear. For example, aluminum, brass, copper, nickel, steel
Metal plate, drum or metal sheet, plastic
Aluminum, nickel, chromium, palladium
Deposition and sputtering of conductive materials such as aluminum and graphite
Conductive by coating with a ring, coating, etc.
Treated, surface oxidation of metal drum, etc.
Treated with metal oxide, or glass or plastic
Substrate such as stick board, cloth, paper etc.
Can be used. The charge generation layer of the laminated electrophotographic photosensitive member is
An electrode is formed on the underlying substrate by vacuum evaporation, sputtering, etc.
Substrate on which a layer of load generating material is formed or underlying
Do not bind the charge generating material on the top using a binder resin.
Can be obtained by forming a layer. Vine
As a method for forming the charge generation layer when using
Can use various methods such as known methods
However, the charge generating substance is usually described later together with the binder resin.
Coating solution dispersed or dissolved in a solvent such as
A method of coating on a substrate and drying is preferably used. Examples of the charge generating material include known materials such as
Seeds can be used. Specifically, amorphous selenium,
Selenium simple substance such as trigonal selenium and selenium-tellurium
Selenium alloy, As_TwoSe_ThreeSelenium compounds such as
II such as selenium-containing composition, zinc oxide, CdS-Se
Materials such as titanium oxide and titanium oxide
Silicon such as oxide semiconductors and amorphous silicon
Various inorganic materials such as system materials, metal or metal-free phthalo
Cyanine, cyanine, anthracene, bisazo compound,
Pyrene, perylene, pyrylium salt, thiapyrylium salt,
Each of polyvinyl carbazole, squarium pigment, etc.
Seed organic materials are included. One of these charge generating substances
Can be used alone or as a mixture of more than one
You can use them together. As a binder resin in the charge generation layer
Is not particularly limited, and various types of known products can be used.
Can be. For example, polystyrene, polyvinyl chloride, poly
Vinyl acetate, vinyl chloride-vinyl acetate copolymer, poly
Vinyl acetal, alkyd resin, acrylic resin,
Rear acrylonitrile, styrene-acrylonitrile copolymer
Coalescence, polycarbonate, polyamide, polyarelay
, Polyester, polyketone, polyacrylamide,
Butyral resin, thermoplastic resin such as ABS resin, poly
Thermosetting of urethane, epoxy resin, phenol resin, etc.
A conductive resin can be used. The charge generation layer
As the binder resin in the polyester of the present invention
Amides can also be used. A charge transport layer in a laminated electrophotographic photosensitive member
Has a charge transport material on the undercoat layer (charge generation layer)
-Obtained by forming a layer bound by resin
You. Various known methods can be used for forming the charge transport layer.
Can be used. Usually, the charge transport material is
Dispersed amide was dispersed or dissolved in a suitable solvent
A method of applying a coating liquid on the undercoat layer and drying is used.
You. Further, the effect of the present invention is prevented in this charge transport layer.
Other binder resins may be used in the polyester
It can also be used by mixing with teramide
You. As the charge transport material, conventionally used charge transport materials
Electron transport materials and hole transport materials. Electronic transport
Examples of substances include chloranil, bromanil, tetracy
Anoethylene, tetracyanoquinodimethane, 2,4,7
-Trinitro-9-fluorenone, 2,4,5,7-te
Toranitro-9-fluorenone, 2,4,7-trinit
B-9-dicyanomethylenefluorenone, 2,4,5
7-tetranitroxanthone, 2,4,9-trinitro
Thioxanthone and the like, 3,5-dimethyl-3 ',
5'-di-tert-butyl-4 ', 4'-dipheno
Electron-withdrawing substances such as diphenoquinone derivatives such as quinone
And their polymeric substances. Note that these
May be used as a single type,
May be used. As an example of the hole transport material, pyrene, N-
Ethyl carbazole, N-isopropylpropyl carbazole,
N-methyl-N-phenylhydrazino-3-methylidene
-9-ethylcarbazole, N, N-diphenylhydra
Dino-3-methylidene-9-ethylcarbazole, N,
N-diphenylhydrazino-3-methylidene-10-e
Tylphenothiazine, N, N-diphenylhydrazino-
3-methylidene-10-ethylphenoxazine, p-di
Ethylaminobenzaldehyde-N, N-diphenylamine
Drazone, p-diethylaminobenzaldehyde-N-
α-naphthyl-N-phenylhydrazone, p-pyrrolidine
Nobenzaldehyde-N, N-diphenylhydrazone,
1,3,3-trimethylindolenine-ω-aldehyde
-N, N-diphenylhydrazone, p-diethylbenz
Aldehyde-3-methylbenzthiazolinone-2-hydride
Razone, 1-phenyl-1,2,3,4-tetrahydro
Quinoline-6-carboxaldehyde-1 ', 1'-di
Hydrazones such as phenylhydrazone, 2,5-bis
(P-diethylaminophenyl) -1,3,4-oxa
Diazole, 1-phenyl-3- (p-diethylamino
Styryl) -5- (p-diethylaminophenyl) pyra
Zon, 1- [quinolyl (2)]-3- (p-diethyla
Minostyryl) -5- (p-diethylaminophenyl)
Pyrazoline, 1- [lepidil (2)]-3- (p-die
Tylaminostyryl) -5- (p-diethylaminophen
Nyl) pyrazoline, 1- [6-methoxy-pyridyl
(2)]-3- (p-Diethylaminostyryl) -5-
(P-diethylaminophenyl) pyrazoline, 1- [pi
Lysyl (5)]-3- (p-diethylaminophenyl)
Pyrazoline, 1- [pyridyl (2)]-3- (p-die
Tylaminostyryl) -5- (p-diethylaminophen
Nyl) pyrazolin, 1- [pyridyl (2)]-3- (p
-Diethylaminostyryl) -4-methyl-5- (p-
Diethylaminophenyl) pyrazoline, 1- [pyridyl
(2)]-3- (α-methyl-p-diethylaminosty
Ryl) -5- (p-diethylaminophenyl) pyrazoli
1-phenyl-3- (p-diethylaminostyryl
) -4-methyl-5- (p-diethylaminophenyl)
L) pyrazoline, 1-phenyl-3- (α-benzyl-)
p-diethylaminostyryl) -5- (p-diethyla
Minophenyl) pyrazoline, spiropyrazoline, etc.
Lazolines, 2- (p-diethylaminostyryl) -δ
-Diethylaminobenzoxazole, 2- (p-die
Tylaminophenyl) -4- (p-dimethylaminophen
Nyl) -5- (2-chlorophenyl) oxazole
An oxazole compound of 2- (p-diethylaminosty)
Lyl) -6-diethylaminobenzothiazole
Azole compounds, bis (4-diethylamino-2-me
Triaryl meta such as tylphenyl) phenylmethane
Compound, 1,1-bis (4-N, N-diethylamido)
No-2-methylphenyl) heptane, 1,1,2,2-
Tetrakis (4-N, N-diethylamino-2-methyl
Polyarylamines such as phenyl) ethane;
N'-diphenyl-N, N'-bis (methylphenyl)
Benzidine, N, N'-diphenyl-N, N'-bis
(Ethylphenyl) benzidine, N, N'-diphenyl
-N, N'-bis (propylphenyl) benzidine,
N, N'-diphenyl-N, N'-bis (butylphenyl
B) benzidine, N, N'-diphenyl-N, N'-bi
(Isopropylphenyl) benzidine, N, N'-di
Phenyl-N, N'-bis (tert-butylphenyl
B) benzidine, N, N'-diphenyl-N, N'-bi
(Isobutylphenyl) benzidine, N, N'-diph
Enyl-N, N'-bis (chlorophenyl) benzidine
Such as benzidine compounds or butadiene compounds
Substance, triphenylamine, poly-N-vinyl carbazole
, Polyvinyl pyrene, polyvinyl anthracene, poly
Vinyl acridine, poly-9-vinylphenylanthra
Sen, organic polysilane, pyrene-formaldehyde tree
Fat, ethyl carbazole-formaldehyde resin, etc.
No. These can be used in combination of more than one
It is also possible to use them together. Preparation of photosensitive layer of electrophotographic photosensitive member of the present invention
Benzene,
Toluene, xylene, chlorobenzene, dichlorobenzene
Aromatic solvents such as acetone, acetone, methyl ethyl keto
Solvents, ketone solvents such as cyclohexanone, methanol
, Ethanol, propanol, isopropanol,
Alcohols such as chill cellosolve and ethyl cellosolve
Solvents, ethyl acetate, ester solvents such as methyl acetate,
Carbon tetrachloride, chloroform, methylene chloride, 1,2-di
Chloroethane, tetrachloroethane, 1,1,1,3
Halogen such as 3,3-hexafluoroisopropanol
Solvents such as tetrahydrofuran and dioxane
Ter solvents, acetonitrile, dimethylform
Amide, dimethyl sulfoxide, diethylformamide
These can be used alone or in combination of two or more.
They may be used together. Each layer is coated by various coating apparatuses such as known ones.
Can be performed. For example, an applicator
ー, spray coater, bar coater, chip coater
ー, roll coater, dip coater, doctor table
And the like. The photosensitive layer of the single-layer type electrophotographic photosensitive member has a binder.
-As a resin, the charge generation in the polyester amide
It contains a living substance and a charge transporting substance.
Various known methods are used as a method for forming the optical layer.
The charge generation material and the charge transport material are usually
Dispersed or dissolved in the solvent with the
A working solution is prepared, and the coating solution is applied to a predetermined undercoat layer,
It is made by drying. In addition, the effects of the present invention are prevented.
Other polyester resin as long as it does not harm the polyester
It is also possible to use it by mixing it with an amide.
You. In the case of the reverse layer type, the electric charge of the layered electrophotographic photosensitive member is
By inverting the generation layer and the charge transport layer,
It can be manufactured in the same manner. The electrophotographic photoreceptor of the present invention comprises
By using teramide as the binder resin,
Compatibility with load generating substances and charge transport substances and affinity with solvents
Coating during the preparation of the photosensitive layer of the electrophotographic photoreceptor
The liquid does not gel or the resin crystallizes.
Excellent in the adhesion performance between the photosensitive layer and the undercoat layer.
Due to the high abrasion resistance of the grease,
Mechanical strength and electrophotographic properties
It is an electrophotographic photoreceptor that is excellent in practical use.
It can be suitably used in the true field. [0038] Next, the present invention will be described with reference to Examples and Comparative Examples.
Although described concretely, the present invention is limited to these examples.
It is not intended to depart from the spirit of the present invention.
Modifications and applications are possible. The electrophotography of the present invention
The photoconductor production method, evaluation items and evaluation method are shown below.
You. Method for producing electrophotographic photosensitive member Amine compound having the structure shown in formula (3) as a charge transport material
And synthesized as in the following Examples and Comparative Examples.
Polyester amide using ester amide: charge transport
Substance: solution with methylene chloride = 1: 1: 8 (weight ratio)
Was prepared as a coating liquid. Such a coating solution is
Oxo-titanium foil formed on an aluminum conductive substrate
Dip-coating on a charge generating layer of about 0.5 μm of tarocyanine
After applying by a method and drying, a charge transport layer of 20 μm
To produce an electrophotographic photoreceptor. [0040] Embedded image (A) Stability of coating liquid Leave the coating solution for one month and check whether the solution has become cloudy or gelled.
Was visually determined. (B) Crystallization during coating Whether the film has become cloudy after applying the coating liquid to the charge generation layer
Was visually determined. (C) Evaluation of electrophotographic characteristics Using an electrostatic charging tester manufactured by Kawaguchi Electric Works, Ltd.
A −6 kV corona discharge is performed, and the initial surface potential (V₀ ),
Residual potential (V) after light irradiation for 5 seconds_R), Half-exposure (E
_1/2) Was measured. (D) Abrasion resistance of charge transport layer 200 g using a Suga abrasion tester manufactured by Suga Test Machine Co., Ltd.
The sample was reciprocated 1200 times on the abraded paper with a load of
The change in the amount of wear after that was measured. Embodiment 1 After adding 600 ml of water to a 1500 ml container,
7.41 g of sodium oxide, bisphenol-C17.
97 g, 3,3'-dimethyl-4,4'-diaminobiph
1.49 g of phenyl, p-tert-butylphenol
Dissolve 0.35g and further divalent phenol
0.5 parts by weight of a polymerization catalyst (trimethylbenzylammonium
Um chloride) and stir vigorously. Separately,
Equivalent of phthalic chloride and isophthalic chloride
11.75 g of a mixture (hereinafter abbreviated as MPC) is measured.
And dissolved in 300 ml of methylene chloride. This chloride
The methylene solution was added to the previously prepared aqueous alkali solution with stirring.
Was added to initiate polymerization. Polymerization reaction temperature below 25 ° C
It was adjusted to become. The polymerization time is 3 hours, then
The polymerization reaction is terminated by adding acetic acid to the system.
Was. Washing with water was repeated until the aqueous phase became neutral. Washing
After completion, slowly add to methanol with stirring to
The ester amide was precipitated. Filter and dry
By this, 30 g of polyesteramide was obtained. Obtained
Polyesteramide using tetrachloroethane solvent
The inherent viscosity was measured at 25 ° C.
831. Embodiment 2 18.12 g of bisphenol-C, 3,3'-dimethyl
-4,4'-diaminobiphenyl 1.50 g, p-te
0.58 g of rt-butylphenol, MPC 16.20
g, sodium hydroxide 7.36 g
In the same manner as in Example 1, 30 g of a polyesteramide was obtained. This
The inherent viscosity of the sample was 0.604. Embodiment 3 17.49 g of bisphenol-C, 3,3'-dimethyl
1.45 g of -4,4'-diaminobiphenyl, p-te
0.90 g of rt-butylphenol, MPC 15.86
g, sodium hydroxide 7.11 g except that used
In the same manner as in Example 1, 30 g of a polyesteramide was obtained. This
The inherent viscosity of the sample was 0.436. Embodiment 4 Bisphenol-C 12.68 g, 3,3'-dimethyl
2.62 g of -4,4'-diaminobiphenyl, p-te
0.46 g of rt-butylphenol, MPC 15.70
g, sodium hydroxide 5.94 g except that used
In the same manner as in Example 1, 30 g of a polyesteramide was obtained. This
The sample had an inherent viscosity of 0.597. Embodiment 5 Bisphenol-C 17.89, 4,4'-diaminobi
1.29 g of phenyl, p-tert-butylphenol
0.58 g, MPC 16.00 g, sodium hydroxide
The same procedure as in Example 1 was repeated except that 7.38 g was used.
30 g of ester amide were obtained. Inherent of this sample
The viscosity was 0.612. Embodiment 6 Bisphenol-A 16.93, 3,3'-dimethyl-
1.57 g of 4,4'-diaminobiphenyl, p-ter
0.61 g of t-butylphenol, MPC 17.00
g, sodium hydroxide 6.86 g
In the same manner as in Example 1, 30 g of a polyesteramide was obtained. This
The inherent viscosity of the sample was 0.624. Embodiment 7 Bisphenol-A 17.05, 4,4'-diaminobi
1.38 g of phenyl, p-tert-butylphenol
0.62 g, MPC 17.11 g, sodium hydroxide
The same procedure as in Example 1 was repeated except that 7.90 g was used.
30 g of ester amide were obtained. Inherent of this sample
The viscosity was 0.628. Comparative Example 1 Bisphenol-C18.28 g, 3,3'-dimethyl
1.51 g of -4,4'-diaminobiphenyl, MPC1
Except that 5.94 g and 7.54 g of sodium hydroxide were used.
Is 30 g of polyesteramide in the same manner as in Example 1.
Obtained. The inherent viscosity of this sample was 1.240.
Was. Comparative Example 2 Bisphenol-C17.97 g, 3,3'-dimethyl
1.49 g of -4,4'-diaminobiphenyl, p-te
rt-butylphenol 1.16 g, MPC 16.45
g, sodium hydroxide 7.41 g except that used
In the same manner as in Example 1, 30 g of a polyesteramide was obtained. This
The inherent viscosity of the sample was 0.239. Comparative Example 3 Bisphenol-C14.28 g, 3,3'-dimethyl
4.73 g of -4,4'-diaminobiphenyl, p-te
0.59 g of rt-butylphenol, MPC 16.24
g, sodium hydroxide 7.50 g
Synthesis of polyesteramide was attempted in the same manner as in 1.
However, a polymer was precipitated during the polymerization. Comparative Example 4 Bisphenol-C 19.36 g, p-tert-butyl
Phenol 0.57 g, MPC 15.73 g, hydroxylated
Same as Example 1 except that 7.86 g of sodium was used
By the method, 30 g of an aromatic polyester was obtained. This sample
The inherent viscosity was 0.637. Comparative Example 5 18.55 g of bisphenol-A, p-tert-butyl
Phenol 0.61 g, MPC 16.93 g, hydroxylated
Same as Example 1 except that 6.83 g of sodium was used
By the method, 30 g of an aromatic polyester was obtained. This sample
The inherent viscosity was 0.659. Comparative Example 6 Stirrer, thermometer, gas inlet pipe, exhaust pipe in three-necked flask
Attach Add 600ml of water to this three-necked flask
After that, 11.26 g of sodium hydroxide, bisphenol
26.09 g of ru-A, p-tert-butylphenol
0.86 g was dissolved, and the dihydric phenol was further dissolved.
0.5 mol% polymerization catalyst (trimethylbenzylan
Monium chloride) was added. Then 300ml
Of methylene chloride into the system and stir it vigorously.
Meanwhile, phosgene gas was introduced. Phosgene empty from cylinder
Through an air wash bottle, a water wash bottle, or an empty wash bottle
Into the flask. Reaction temperature during phosgene gas introduction
Was adjusted to be 25 ° C. or less. Progress of polycondensation reaction
At the same time, the viscosity of the organic phase in the system increases. Hosgenga
Is added until the yellow color of the phosgene-hydrogen chloride complex disappears.
did. Then, polycondensation reaction is performed by adding acetic acid.
And repeat washing with water until the aqueous phase is neutral
Was. After washing, slowly add to stirred methanol
Then, the polycarbonate was precipitated. Further filtration and drying
Thereby, 30 g of polycarbonate was obtained. Profit
Polycarbonate using tetrachloroethane solvent
When the inherent viscosity was measured at 25 ° C.,
0.662. Comparative Example 7 Bisphenol-Z 26.61 g, p-tert-butyl
0.74 g of phenol, sodium hydroxide 11.91
g of polycarbonate in the same manner as in Comparative Example 5 except that g was used.
30 g were obtained. The inherent viscosity of this sample was 0.1.
651. The compounds synthesized in Examples 1 to 7 and Comparative Examples 1 to 7 were synthesized.
Polyarylate or polycarbonate
As a result of the stability of the coating liquid used for the fat,
Table 1 shows the presence or absence of the conversion. Also, in electrophotographic photoreceptors
Initial surface potential (V₀ ) Residual potential after 5 seconds light irradiation
(V_R), Half-exposure (E_1/2) Are shown in Table 2 and Table 3
Indicates the results of the wear resistance of the charge transport layer. [0057] [Table 1] [0058] [Table 2] [0059] [Table 3] [0060] [Table 4] [0061] According to the present invention having the above-described structure,
Use of light polyesteramide as binder resin
Compatibility with charge-generating substances and charge-transporting substances
Good affinity for the medium
The coating liquid may gel or the resin may crystallize during layer preparation.
I can't. In addition, the photosensitive layer and the undercoat layer have excellent adhesion performance.
And the abrasion resistance of the binder resin is high.
To maintain electrophotographic properties even after extended use
Can be Therefore, the electrophotographic photoreceptor of the present invention
Is an electrophotographic photoreceptor excellent in practical use.
It can be suitably used in the true field.

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-57-151949 (JP, A) JP-B-48-19237 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) C08G 69/00-69/50

Claims (1)

(57) [Claims] (1) An electronic photograph in which a photosensitive layer is formed on a conductive substrate.
In the true photoreceptor, a tree for the binder forming the photosensitive layer
Fat is a structural unit represented by the following general formulas (1) and (2)
And the configurations represented by these equations (1) and (2)
The unit molar fraction is 0.05 ≦ [(2) / ｛(1) +
(2)｝] ≦ 0.20, and tetrachloroethane
A solution of a 1.0 g / dl solution as a solvent at 25 ° C.
Inherent viscosity (η inh. ) Is 0.25 to 1.00
Electrophotographic feeling which is a polyesteramide characterized by the following:
Light body. Embedded image Embedded image Wherein X is a single bond, an oxygen atom, a sulfur atom,
Group, alkylidene group, phenylalkylidene and
Selected from the group consisting of loalkylene groups, wherein Y is benzene
Ring, biphenyl, naphthalene ring, aliphatic hydrocarbon group and
Selected from the group consisting of cyclic hydrocarbon groups, R ₁ , R ₂ , R ₃
And R ₄ each independently represent a hydrogen atom, a halogen atom,
Selected from the group consisting of hydrogen groups. ]