JPS59151157A - Electrophotographic sensitive body - Google Patents

Abstract

PURPOSE:To manufacture easily an electrophotographic sensitive body with superior durability at a low cost by using a photosensitive layer contg. a specified stilbene compound. CONSTITUTION:A stilbene compound represented by the formula (where R<1> is H, alkyl, alkoxy or halogen; each of R<2> and R<3> is alkyl, aralkyl or aryl; R<4> is H or phenyl; and the ethyl group is a substituent at the p- or o-position), e.g. 4- ethyl-4'(N,N-diphenylamino)stilbene is used. A photosensitive layer 2 of about 3- 50mum thickness contg. about 30-70wt% said stilbene compound and about 0.5- 3pts.wt. sensitizing dye such as brilliant green is formed on an electrically conductive support 1 to obtain an electrophotographic sensitive body.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a photoreceptor used in electrophotography,
Specifically, the present invention relates to an electrophotographic photoreceptor containing a specific stilbene compound in the photosensitive layer.

Electrophotography has been widely known as one of the image forming capabilities. "Electrophotography" generally means that a photoconductive photoreceptor is first charged in a dark place by, for example, =Irona discharge, and then imagewise exposed to selectively dissipate the charge only in the exposed area, thereby discharging the electrostatic charge. This method obtains a latent image, dyes this latent image area, and develops it with electrostatic fine particles (toner) composed of a coloring material such as a pigment and a binder such as a polymer substance to form an image. .

The basic characteristics required of a photoreceptor used in such electrophotography are (1) ability to be charged to an appropriate potential in a dark place, (2) less dissipation of charge in a dark place, 3] Scales and surfaces can be cited as being able to dissipate electricity in a beautiful manner through light irradiation.

A3 to the electronic 7F mode (use FL light 3#)
Examples include inorganic substances such as electrolyte C1,1, relene, and cadmium oxide, but each of these conventional substances has many advantages. However, it had various drawbacks and was not always satisfactory. For example, the rails v1 of fi+-, . - In addition, since there is no rIJ deflection M, Hell 1.1 person (this 1 river ['Ij thing is Te 11
C against mechanical rain shock (not J, heat 1゜)
Wow TF! Therefore, there are vacancies that require careful handling.叉、sulfurizing power Domino\(ゝ] acid 11'11
1i ff (7b, the photoreceptor is smooth ↑11
．． 1% lj polishing, tensile strength FJ, il gap ('l'<'
Nito June t (mechanical special 1st item is inferior 1, (t; 1
Repeat T' 1tlj It's C'4r to go down the river, 11
1i (1, + - In order to eliminate the vacancy of these 1r-materials, we will use various photonic materials 111 and 1i).
Has the r5 true ITI photoreceptor been discovered and put into practical use? ,
) is also 17) '(:). For example, poly-N-1:nylcarbasol and 2. II, photoreceptor consisting of 7-dolinite (rice 11i.mouth?i'1 No. 311 11
112 3 7) and sensitized polyN-hinylcarhazole with biryliu 11 salt dye C.7. I feel like it) 1'1 rest (1-1 Kosho 4L25658fi Ko?
lJ Below IV. ), t-+ Ik11iiFl
A photoreceptor consisting of a main component (described in the publication No. 7-37543), a photoreceptor consisting of a dye r+1 and a resin (described in the publication No. 7-37543), a photoreceptor consisting of a dye R+1 and a resin
The feeling that the main component is the body)
These photoreceptors have excellent characteristics and have a relatively high practical value (1r1 is considered to be high), but they are not suitable for electrophotographic photoreceptors. Considering the 2X characteristics, I don't think there is anything that satisfies C-required.

In general, the characteristics of photoreceptors are different depending on the production method, but depending on the method used, the photoconductor method used is
There is a strong demand for photoconductive materials that have sufficient characteristics to be used as photoreceptors for electrophotography because of the f+J fit.

The present invention was also made in accordance with such requests.
As a result of extensive research and consideration by the present inventor, the following general formula (I> \ 3 1 [where the ethyl group is substituted at the para or ortho position, and R1 is a hydrogen atom, an alkyl group, an alkoxy group, or a halogen Atoms R2 and R3 represent an alkyl group, a substituted or unsubstituted aralkyl group, or a substituted or unsubstituted aryl group, and R4 represents a hydrogen atom or a substituted or unsubstituted phenyl group.

It has been found that the stilbene compound represented by the following formula works effectively as a photoconductive substance for electrophotographic photoreceptors. In the general formula, substituents on the aralkyl group or aryl group of R2 or R3 include a lower alkyl group, a lower alkoxy group, an aryloxy group, a halogen atom, a lower dialkylamino group, a hydroxy group, a carboxy group, or The ester, nitro group, acetyl group, or cyan group, etc., and the substituent on the phenyl group of R4 include, for example, a lower dialkylamino group.Furthermore, this stilbene compound can be used as It was also discovered that a photoreceptor having unexpected effects can be created by combining the photoreceptor with various materials.The present invention was completed based on these findings.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a photoreceptor that can overcome the various drawbacks of the conventional photoreceptor described above and fully satisfy the conditions required in electrophotography, and is particularly suitable for the photoreceptor. The object of the present invention is to provide a photoconductive material that has excellent properties. Another object of the present invention is to provide an electrophotographic photoreceptor that is easy to manufacture, relatively inexpensive, and has excellent durability.

That is, the present invention provides an electrophotographic photoreceptor (d'-3) in which a photosensitive layer is provided on a conductive support, and the photosensitive layer contains a stilbene compound represented by the above general formula (I). It is characterized by this.

The present invention will be explained in detail below with reference to the drawings.

FIGS. 1 to 3 are representative cross-sectional views of the photoreceptor according to the present invention, and the numbers assigned thereto include 1 for the conductive support, 2.2-12'' for the photosensitive layer, 3 is a charge generating substance;
4 represents a charge transport medium or charge transport layer, and 5 represents a charge generation layer.

The stilbene compound represented by the general formula (I) used in the present invention is represented by the following general formula (I) [wherein the substitution position of the ethyl group is the bara position or the A-orto position, and the logon-Δn is not shown]. A phenyl derivative represented by the following general formula (I R1 is a hydrogen atom, an alkyl group, an alkoxy group, or a halogen atom; R2 and R3 are an alkyl group, a substituted or unsubstituted aralkyl group, or a substituted or unsubstituted aryl group; R4 is a hydrogen atom or a substituted or unsubstituted phenyl group; It can be obtained by reacting with a carbonyl compound represented by the following.

Specific examples of the stilbene compound represented by the general formula (I) thus obtained are shown in Table 1 below.

Substitution position 11 H4C2, Hs C21+5
1-1 substitution position 15 H4-CH2 rich C2Hs C
H2GoCzHs H481-14-CH2 Yutaka Cf
l -CH2-/jg training H21H2CH2@
082℃ H 221-13-CH2-g≠)) -
CI-12((sheet) 1 substitution position 252-CH34-CH2%○C1-13-CI-<teOCH3l-1262-CI-13A-C112(
)OC21-Is-CI-12-CvOC2f-1,
H272-CH34-Ct-hGcj2 −
Cf-h-t&huge) CJ2'H292-OChh 4
-CH2GCI-13-CI-hGcl-1+
l-1312-OCH34-CH2eCzHs C1
-hec2Hq l-1322-CI2 4 -C
I-12eC1-1a =Cl-12eCI-1+
I-1 substitution position 363-CH34-CH2C2H5'CI-(+C2
H5+372-QC〆Hs 4 C1-12 Shinro C output -CI-12 combination Cl-131-1393-CA
4-CH2eCz
t-b -CH2eC2tI5 H40H
2-CI-+2be3=C←C out -CI-+2be3 giant Cto13 )→41 H3-CHz<
Column OCH3-CH'2>0CH3H421-14-C
I-13-CI-12 ((■ l"43 l-14
C2H5, CH Deaf H44H4-(CI-12)2
Published by ct -CH2@←○CH3H45H4-(
CH2)3CH3-082°C H substitution position 41 8 2
CH3-CI-1z - Kugugi〉
H481-l3', CH3-CH
2 [Phase] 1''49 2-CH34-CH3-CI-1
2@t(502-C2Hs 4 -
CI-L+ -CI-124ul-1512-C
A4
CH3-CI-1z (C lower) 1522
-C21-1s IJ -CH3-CI-12
@ l-1532-OC2H54-CH3' -
ct-12-□ 1-154 2-CH34-CH
3CH+CI-h H562-CH34C21-1
5-Ct(2GcH3H512-OCH34~Cl-1
3Cl-12 ((huge) OCt-h l-l 1 momme 1119 !i9 H2-Cf] 3- -CI"?
((〒=shi;)hiC1(3FlGOl-l 3
-CI-13-CH24)○C1-13H611-14
A (A [phase] )-IO2l-14 Cl
-13- (Hobe 1:l t-163to (4-kumi))c21-+5Jgkaku>C2Hst-IO2+-14
Go (C)” Mountain Ct-b Tatami (Cal-12) 20H, +
t-16,5l-14<φ)Ct4Cf-h)CI-
h HexC1-1(CH3)CHx l-166
H4+CH2')3Ct-h -ku〈=raX(
cthhhcll: + l-1G7 H4 or >C (C
H3) 3 combination c<c+-+mountain [-168to1
4 @
Combined C1-h l-1 substitution position 74 H2 guy 1-1 77 1-1 2 (Crochet 1) Tatami C1
”3 L178 1-1 2 ((◇-0CI
-13 +OCH, +l-180l]2
CH3 ((of) 1-substituted position including R'-4 below) "R"R'
R3R' thing
Ngu82 H2-CH] →<Rikaku>-〇C1-131-1831-+ 3
((Σ>'gerror> t1
a41" 3-@door CH3be)) CI-h H85
II 3 Bitter○C1” 3
Tatami○CH:l H861-14+○CH3+○CH
3H 881 (4+OCHL (ku=huge))
1 (,OCH3,0CI-1a 89 +-+ 4 zu zu I" 9
0 F+4-! @←OC2l7
-Kukura>-C07hb l-1911-1
4 (3μ0C2Hs Beko) 1”92
HIt + OCH〕 ← (four = shi)
-CHl-1 substitution position 94 +" /I +0C
l-h ya-C7HK l-19G
l-14%cp-@-CIllR1197H4+Cf
f1 Dowel 11100 N 4 -
Yato Liu-@1 (10211/+ e Ya
1-1u U replacement device +05 1-1 4 Q [phase] l-1
Cl-13 +07 H4 combination N <Cl-13) 2 [Phase]
1” 108 1-1 4 8N (C21-15
) 2 [phase] 1"+09 1-1 4goN(C
H Mountain Article N (CH3) 2 Hllo Tol
4 -<<>>-N (C2H5)
2 combination N (C21-15) 2 1-
1441 l-14-CI-(3((force H11
21-l 'l CH3 tatami CI-h l
-14i3 H4CH3+C2H5H Substitution position 115 H4-CH3QOH Cl-1:1 116 Tol 4
-CH3-ku〈〉〉-0ct-h
H117H4-CI-13 ((kaOC21-151-
111984~CHB Building N (02H5)
2 +-1120H4-CI-13-kuku〉〉toc, Q II? 124 H4-C
zt-15℃ H122t/
1-C21-15+CI-h l-1
+23 l-14-C2H591-1l-13 124H4-C2H5+C21-158 Replacement position 127 I'4 C2H5 (defense OC2H5H1
28H'I C2H5goN (C1-1 mountain H120
H4-C2H54C,Q +130 1-l 4
-(CI-12>20H3-113184-(C
H2) 2C 13 ((Minister) CH3+13
2 1-1 4-(CI 1,0002>2C
H31jl Omi Uichi 0CH31-1i33 H4-(C
H2)2CH3+C,Q H134,l-14-(C
1-12) 2 C1-13+N (CI-l mountain 1-1
435 1-1 4-(CH
2) 3CHB Combined CI-h H4
36H4-(CH2>3CI-1380CI-h
I” substitution position 138 1-1 4- (CH2')
3 CH3((U>N(CH3)2 1-l+39
8 2-CI-138CH3I''++o H
3-CH3-<koku = mitomomi>> 1-1144
t-14-CI-12 tatami ℃11142
H4CH2+cH3℃ 114
5 H4-CH2GOCt-h @
Old 146 H4CH4 Anti-OCz H5 (U'
l-1 tail 3 Replacement good device y +52H3-CH7 @ dynamic l1 153 tol 2
- Cl-12←Big Σ>-@"+54 t"
4 CM 3 CH3@-N (CH31)
21', +5 t-l/l
-C21-1s
C do to 15 8 times mutual>N(C2H5)2+
56 HA-C)-13-CH3@Tb7
It 4 -C21-15-C2H5 ((U1
58 8 4 0H2(C≧:)-0
CI-13-CJ-1z combination QCI-h l-11
59l-l 4 Cl-12亥 -CN? @'
l-1Cl-13 The photoreceptor of the present invention contains one or more of the above-mentioned stilbene compounds in the photosensitive layer.
It can be used as shown in FIG.

The photoreceptor in FIG. 1 has a photosensitive layer 2 made of a stilbene compound, a sensitizing flux, and a binder (binder resin) on a conductive support (t11). Stilbene compounds act as photoconductive substances, and the generation and transfer of charge carriers necessary for light attenuation occur through the stilbene compounds.However, since the stilbene compounds have little absorption in the visible region of light, For the purpose of forming an image using visible light, it is necessary to sensitize by adding a sensitizing dye that absorbs in the visible region.

As shown in FIG. 2, the photoreceptor shown in FIG. The stilbene compound here C forms the charge transport medium 4 together with the binder (or binder and plasticizer), while the charge generating material 3 (a charged photosensitive material such as an inorganic or organic pigment) generates charge carriers. In this case, the charge transport medium 4 is mainly responsible for receiving the charge carriers generated by the charge generating substance 3 and transporting them.
In this photoreceptor, the basic condition is that the absorption wavelength regions of the charge generating substance 3 and the stilbene compound do not overlap each other in the visible region. This is because in order to efficiently generate charge carriers in the charge generation material 3, it is necessary to transmit light to the surface of the charge generation material. The stilbene compound represented by the general formula (I) has almost no absorption in the visible region, and generally absorbs light in the visible region and is particularly effective as a charge transport material when combined with a charge generating material 3 that generates charge carriers. Its characteristic is that it works.

As shown in FIG. 3, the photoreceptor shown in FIG. ″
In this photoreceptor, light transmitted through the charge transport layer 4 reaches the charge generation layer 5, and charge carriers are generated in that region. This device receives carrier injection and transports it. The charge carriers necessary for light attenuation are generated by the charge generation substance 3, and the charge carriers are transported by the charge transport layer 4 (mainly a stilbene compound acts). This mechanism is similar to that described for the photoreceptor shown in FIG.

In order to actually produce the photoreceptor of the present invention, in the case of the photoreceptor shown in Figure 1, one or more stilbene compounds are dissolved in a solution containing a binder, and then a sensitizing agent The photosensitive layer 2 may be formed by preparing a liquid containing the above, coating the electroconductive support 1 on the conductive support 1, and drying it.

The thickness of the photosensitive layer 2 is 3 to 50 μIn, preferably 5 to 2
0 μm is appropriate. The amount of the stilbene compound in the photosensitive layer 2 is 30 to 70% by weight, preferably about 50% by weight, and the amount of the sensitizing dye in the photosensitive layer 2 is 0.1 to 70% by weight.
5% by weight, preferably 0.5-3% by weight. As sensitizers, triarylmethane dyes such as Brilliant Green, Victoria Blue A BN Methyl Bi Alet, Crystal Violet, Acid Violet 6B, Rhodamine B10-Damine 6G, Rhodamine G Extra, Eosin S, Erythrosin, Rose Bengal, Fluorescein are used. xanthine dyes such as methylene blue, thiazine dyes such as methylene blue, cyanine dyes such as cyanine, 2,6-diphenyly 4-(N,
N-dimethylaminophenyl) thiapyrylium verchlorate, benzobyrylium salt (Special Publication No. 1982-25658
Examples include biryllium dyes such as those described in Japanese Patent Publication No. In addition, even if these sensitizing agents are used alone, they will cause 2! i
I! The above may be used in combination.

Moreover, in order to produce the photoreceptor shown in FIG. 2, 1f! 1
Alternatively, the photosensitive layer 2' can be formed by dispersing fine particles of the charge generating substance 3 in a solution containing two or more types of stilbene compounds and a binder, coating this on the conductive support 1, and drying it. .

The thickness of the photosensitive layer 2' is 3 to 5 μm, preferably 5 to 20 μm.
m is appropriate. The amount of the stilbene compound in the photosensitive layer 2' is 10 to 95% by weight, preferably 30 to 90% by weight.
The charge generating substance 3 accounts for 0.1 to 50% by weight, preferably 1 to 20% by weight in the photosensitive layer 2-.

Examples of the charge generating substance 3 include inorganic pigments such as selenium, selenium-tellurium, cadmium sulfide, cadmium sulfide, and α-silicon, and examples of organic pigments include CI Pigment Blue 25 (Color Index CI 2).
1180), CI Pigment Red 41 (CI
21200), Sea Acid Red 52 (
CI 45100), CI Basic Red 3
(Cr 45210), an azo pigment having a carbazole bone core (described in JP-A-53-95033),
Azo pigment with distyrylbenpine bone core
-133445), an azo pigment with a triphenylamine bone core (described in JP-A-53-132347), an azo pigment with a dibenzothiophene core (described in JP-A-53-132347),
(described in JP-A No. 54-21728), an azo pigment with an oxadiazole bone core (described in JP-A-54-12742), an azo pigment with a fluorenone bone core (described in JP-A-11-11-12834) (described in the publication), an azo pigment having a bisstilbene bone core (Japanese Unexamined Patent Publication No. 1773-1973)
Distyryl oxadiazole is an azo pigment with a nucleus (described in Japanese Patent Application Laid-Open No. 54-2129).
Azo pigments such as azo pigments having a distyrylcarbazole core (described in JP-A-54-149Ci7), such as C.I. Pigment Blue 16 (CI74100)
Phthalocyanine pigments such as C.I. Butt Brown 5 (CI 73410), indigo pigments such as C.I. Butt Dye (CI 73030), Argo Scarlet B (manufactured by Bayer), Indus Lens Snow J-let R (manufactured by Bayer). Examples include perylene pigments such as.

Note that these charge generating substances may be used alone or in combination of two or more types.

Furthermore, in order to fabricate the photoreceptor shown in FIG. 3, a charge-generating substance is vacuum-deposited on a conductive support 1, or fine particles 3 of a charge-generating substance are deposited in a suitable form with a binder dissolved therein if necessary. By applying a dispersion in a solvent and drying it,
Furthermore, if necessary, surface finishing and film thickness adjustment are performed by a method such as puff polishing to form a charge generation layer 5, and a solution containing one or more stilbene compounds and a binder is applied thereon. The charge transport layer 4 may be formed by coating and drying. The charge generating material 3 used to form the charge generating layer 5 here is the same as that used in the description of the photosensitive layer 2'.

The thickness of the charge generation layer 5 is 5 μm or less, preferably 2 μm or less, and the thickness of the charge transport layer 4 is suitably 3 to 50 μm, preferably 5 to 20 μm. When the charge generation layer 5 is of the sabot type in which fine particles 3 of the charge generation substance are dispersed in a binder, the proportion of the fine particles 3 of the charge generation substance in the charge generation layer 5 is preferably 10 to 95% by weight. 50-90
It is about % by weight. Further, the amount of the stilbene compound in the charge transport layer 4 is 10 to 95% by weight, preferably 30 to 95% by weight.
It is 90% by weight.

J5, in the production of any of these photoreceptors, a metal plate or metal foil such as aluminum, a plastic film on which a metal such as aluminum is deposited on the conductive support 1,
Alternatively, paper that has been subjected to conductive treatment may be used. In addition, as a binder, condensation resins such as polyamide, polyurethane, polyester, epoxy resin, polyketone, and boron carbonate, and small vinyl polymers such as polyvinyl carbon, polystyrene, polyN-vinylcarbazole, and polyacrylamide are used. However, any insulating and adhesive resin can be used. A plasticizer may be added to the binder if necessary;
Examples of plasticizers include halogenated paraffin, polychlorinated polychloride, dimethylbutylphthalene, and dibutyl phthalate.

Furthermore, an adhesive layer or a barrier layer can be provided between the conductive support and the photosensitive layer, if necessary, on the photoreceptor prepared as described above. Examples of the material include polyimide, nitrocellulose, aluminum oxide, etc., and the film thickness is preferably 1 μIn or less.

To perform 'C copying using the photoreceptor of the present invention, the photoreceptor surface is charged and exposed, and after Ic, development is performed, and if necessary, transfer to a set etc. is performed. The photoreceptor of the present invention obtained as described above has excellent advantages in electrophotographic photoreceptor binding, such as high sensitivity and flexibility.

Examples are shown below. In the following example, the part J-3 is the part with a thousand hanging parts.

Example 1 Potassium-1-]1hexide io, 1g was converted into N,N-
Dimethylformamide 80mJ2. 15.4 g (0,060
mol) was added under water cooling. Additionally, 16.4 g of 4-,(N,N-diphenylamino)henzaldehyde (0,0
60 mol) to 80 m, g of N,N-dimethylformamide
A solution dissolved in was added to the mixture, and the reaction was carried out at room temperature for about 12 hours.

The reaction mixture was poured into about 600111A of water and the resulting sticky yellow solid was dissolved in about 200M of toluene, Q.

After washing this solution with water, the toluene phase was treated with anhydrous sodium sulfate, toluene was distilled off, and a yellow solid was obtained.

This was recrystallized with a mixed solvent of cyclohexane and ethanol, resulting in a tan-yellow sword-shaped product with a weight of 10.22. ] (Receipt: $45.4
%) was 1q.

This 4 (or 2)-ethyl-4=-(N.

N-diphenylamino)stilbene (No. 61 in Table 1)
The melting point of > is 140.0 to 141.5℃,
.

Dense photobiomaterials include Diane Blue (CI Bigmen 1 Heavy Blue 25, CI 21180), 76 parts, polyester resin (Vylon 200, manufactured by Toyobo Co., Ltd.)
1260 parts of Doronfuran solution and -i in 2% tetra of
3,700 parts of trahydrofuran were pulverized and mixed in a ball mill, and the iq charge generation layer forming liquid was applied to an aluminum conductive support made of aluminum-deposited polyester paste using a doctor blade, and air-dried. A charge generation layer having a thickness of about 1 μm was formed.

On the other hand, what about the charge transport material? 4 (or 2
)-Ejiru 4-1 (N, N-Sifnylamino) 2 parts of stilbene (No. 61 in Table 1), 1300 (manufactured by Teijin Co., Ltd.) and 16 parts of tetrahydrofuran were mixed with polycarbonate resin Kupanrye l-. After dissolving to form a charge transport layer forming liquid, this was applied onto the electrostatic generation layer using a 1-lid blade, and dried at 80°C for 2 minutes and then at 105°C for 5 minutes to a thickness of approximately A charge transport layer having a diameter of 20 μm was formed to prepare photoreceptor NO31.

Examples 2-10 Electron generation and charge transport materials (stilbene compounds)
Photoreceptors Nos. 2 to 10 were prepared in exactly the same manner as in Example 1, except that the photoreceptors were replaced with those shown in Table 2.

Example 11 On an aluminum plate having a thickness of about 300 μm, selenium was vacuum-deposited to a thickness of about 1 μm to form a charge generation layer. Next, 2 parts of stilbene compound No. 62, polyester resin (Poly J Stel Adhesive 4900 manufactured by DuPont)
0), 3 parts and 45 parts of tetrahydrofuran were mixed;
Dissolve to create a charge transport layer forming liquid, apply this onto the charge generation layer (selenium vapor deposited layer) using a doctor blade, air dry, and then dry under reduced pressure to a thickness of about 16 cm.
A charge transport layer of 11 m is formed to form a photoreceptor N of the present invention.
o,” II is 19.

Example 12 A charge generation layer (however, the thickness was approximately 0.3 μm) was formed using a perylene pigment represented by the following structural formula in place of selenium, and a sudirbene compound was used in place of No. 62, and No. 62 was used in place of No.
A photoreceptor No. 0.12 was prepared in exactly the same manner as in Example 11 except that photoreceptor No. 86 was used.

Example 13 A mixture of 1 part of Diane Blue (same as used in Example 1) and 158 parts of tetrahydrofuran was ground and mixed in a ball mill, and this was mixed with No. 1, 12 parts of a stilbene compound of 141, and a polyester resin. (DuPont Wa Polyester Adhesive 49000) 18 parts were added and further mixed to obtain a photosensitive layer forming liquid, which was applied onto an aluminum-deposited polyester film using a doctor blade and dried at 100°C for 30 minutes to form a thick film. Approximately 11μm
A photoreceptor No. 13 of the present invention was prepared by forming a photoreceptor layer.

The photoreceptors N011 to 13 thus produced were tested at -6 KV or +6 KV using a commercially available electrostatic duplication paper tester (Model 5P428 manufactured by KK Ill D Denki Seisakusho).
After charging by corona discharge for 20 seconds, 20
Leave it in a dark place for a second, measure the surface potential V Do (volts) at that time, and then illuminate the photoreceptor surface with tungsten lamp light so that the illumination intensity on the photoreceptor surface is 20 lux, so that the surface potential is 1/1 of V po. Find the time (seconds) until it becomes 2,
The exposure amount Fl,/2 (lux·sec) was calculated.

The results are shown in Table 3.

Further, each of the above-mentioned photoreceptors was powered off using a commercially available electrophotographic copying machine, and then light was irradiated through the original image to form a C electrostatic latent image, which was developed using a dry type 1 immediate developing agent. When the obtained image (toner image) was electrostatically transferred and fixed onto plain paper, a clear transferred image was obtained. A similarly clear transferred image can be obtained when a wet type developer is used as the developer.

Table 3 Photoreceptor V DL) F 1i 2
No. (Volts) (Looks/Seconds) 1
-1305 1.12 -12
83 1.33 -955 0
．． 9 4 -915 0.9 5 -1204 1.56 -1
366 2.77 -1305
1.28 -1144 1.39
-1225 1.310 -'10
79 2.411 =897
=L812 -1108 6.81
3 + 733
5.2

[Brief explanation of drawings]

1, 2, and 3 are cross-sectional views enlarged in the thickness direction of an electrophotographic photoreceptor according to the present invention. 1... Conductive support 2.2-12''... Photosensitive layer 3... Charge generating material 4... Charge transporting medium or charge transporting layer 55... Charge generating layer Figure 3 Procedural Correction Mortar 1. Indication of Incident Patent Application No. 58-24697 2,
Title of invention Electrophotographic photoreceptor 3? Relationship with case of person who commits ni-correction Patent application Name of person
(674) Ricoh Co., Ltd.-4, Agent (1) Corrected "diphenyli" on page 27, line 12 of the specification as "1 diphenyl." (2) Set j-5f1mj on page 28, line 3 to r50f1m
Correct it with J. (3) On page 29, line 17, 1 Indus Lens Scarlet I-RJ is corrected to "Indus Lens Scarlet I-R". (4) Structural formula of charge generating substance in Example 4 on page 37] (7) Correct rc and QJ to rc2H5'J. (5) Charge generating material 4 (4H1) of Example 6 on page 36
The r l-10CON HJ on the right side of the formula is
C0NHJ do revision j1-riru. (6) "1 power outage" on page 39, line 8 is corrected to "Electrification 1. Procedural amendment mortar 1, incident indication Japanese Patent Application No. 1982-24697 2,
Title of the invention Electrophotographic photoreceptor 3, person making the amendment, relationship to the case Patent application Person name <674) Ricoh Co., Ltd. 4, agent 5, date of amendment order voluntary)

Claims (1)

[Scope of Claims] A photoreceptor for electrophotography, characterized in that a photosensitive layer containing as an active ingredient at least one stilbene compound represented by the following general formula (I) is provided on a conductive support. However, the substitution position of the ethyl group is the bara position or the Alto position, R1 is a hydrogen atom, an alkyl group, an alkoxy group, or a halogen atom, and R2 and R3 are an alkyl group, a substituted or unsubstituted aralkyl group, or a substituted or unsubstituted aralkyl group. The substituted aryl group R4 represents a hydrogen atom or a substituted or unsubstituted phenyl group.