JPS6250764A - Photosensitive body - Google Patents

Abstract

PURPOSE:To prevent lowering of the sensitivity and to stabilize the repeating characteristics by forming a layer contg. a charge generating substance on an electrically conductive substrate and incorporating a specific low molecular ammonium salt into the layer by a specified amount basing on the amount of the charge generating substance. CONSTITUTION:A charge generating layer and a charge transferring layer are successively laminated on an electrically conductive support to obtain a photosensitive body. The charge generating layer contains a charge generating substance such as a guaiazulene or perylene pigment and a low molecular ammonium salt. The amount of the ammonium salt is 0.1-15pts.wt. per 100pts.wt. charge generating substance. A compound represented by the formula (where R1 is acyclic or cyclic hydrocarbon, each of R2, R3 and R4 is H, acyclic or cyclic hydrocarbon and X<-> is an anion) or a salt of a heterocyclic compound contg. quatervalent nitrogen is used as the low molecular ammonium salt. Since the charge generating layer contains the ammonium salt, the repeating stability of the photosensitive body can be improve without lowering the sensitivity.

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a photoreceptor suitable for use in electrophotography, and more particularly to a photoreceptor whose repeatability can be improved without reducing sensitivity. [Prior Art] Conventionally, photosensitive layers used in electrophotographic photoreceptors include Se,
Inorganic photoconductive materials such as CdS and ZnO are widely used. However, when these inorganic compounds are used as the photosensitive layer of an electrophotographic photoreceptor, they are not always satisfactory in terms of heat resistance, durability, and toxicity. Research into the use of organic photoconductive materials as photosensitive layers in electrophotographic photoreceptors has been actively conducted. Especially when an organic photoconductive substance is used as the photosensitive layer of an electrophotographic photoreceptor. Electrophotographic photoreceptors have the advantage of being highly flexible, easy to manufacture, and being less expensive. However, it is currently not possible to obtain a photoreceptor that satisfies all the characteristics required of an electrophotographic photoreceptor in terms of sensitivity and durability. As a technique to improve the durability of the body. Several techniques are known. For example, in Japanese Patent Application Laid-Open No. 59-157, N and N are added to the photosensitive layer.
A technique for improving repeatability by including a -disubstituted dithiocarbamate has been disclosed. However, although this technique is effective to some extent against 03 deterioration, it has the drawbacks of poor storage stability and decreased sensitivity under high temperature and high humidity conditions. Furthermore, Japanese Patent Application Laid-Open No. 59-218447 discloses a technique for improving the repeated potential stability by incorporating an amine into the photosensitive layer. However, this technique has the disadvantage of reduced sensitivity. Furthermore, JP-A-58-166.351, JP-A No. 58-16
No. 6352 discloses a technique in which a polymer of a specific quaternary ammonium salt is used as a binder resin for a charge generating substance. However, since it is necessary to control the reaction rate, composition, etc. during the manufacturing process, there is a drawback that the production stability is lacking, resulting in large variations in performance, and the sensitivity is also low. [Problems to be Solved by the Invention] Therefore, an object of the present invention is to provide a practical photoreceptor that stabilizes repeatability characteristics without reducing sensitivity and satisfies the characteristics required of an electrophotographic photoreceptor. Consider it a technical issue. [Means for Solving the Problems] The present inventor has conducted extensive research to solve the above problems, and as a result has arrived at the present invention. That is, 1 the photoreceptor according to the present invention is a photoreceptor having a layer containing at least a charge generating substance on a conductive substrate,
In the photoreceptor, a low molecular ammonium salt (hereinafter referred to as a compound of the present invention) is added to 100 parts by weight of a charge generating substance.
It is characterized by containing 0.1 parts by weight or more and 15 parts by weight or less. The compound of the present invention has a molecular weight of 2000 or less, preferably 1000 or less, more preferably 750 or less.
If the molecular weight is 2,000 or more, the compatibility with the binder decreases, precipitation etc. occur, which affects moisture resistance etc. Preferred embodiments of the compounds of the present invention are as follows. That is, the following (a) and (
The method is to use the compound shown in b). (A) (General formula I) R+ -N O-R4XC) In the formula, R1 is a substituted or unsubstituted acyclic hydrocarbon group, ll
Represents a substituted or unsubstituted cyclic hydrocarbon group. R2-R4 represents a hydrogen atom, a substituted or unsubstituted acyclic hydrocarbon group, a substituted or unsubstituted cyclic hydrocarbon group, and X-
represents an anion. The substituted or unsubstituted acyclic hydrocarbon group includes a substituted or unsubstituted acyclic saturated or unsaturated hydrocarbon group,
The unsubstituted acyclic saturated or unsaturated hydrocarbon group preferably has 1 to 20 carbon atoms, such as methyl group, ethyl group, n-propyl group, 1so-propyl group, n-butyl group, 1so- Butyl &, tert-butyl group, pentyl group, n-hexyl group, m-hebutyl group, n-
Ofthyl group, 2-ethylhexyl group, dodecyl group, hexadecyl group, octadecyl group, vinyl group, allyl group, 1
, 3-butadienyl group, 3-methyl-2-butenyl group,
Examples of substituted acyclic saturated or unsaturated acyclic hydrocarbon groups include impropenyl group, 2-butynyl group, etc., and examples of substituents include chloro group, pro-7 group, cyano group, phenyl group, There are methoxy groups, acyl groups, hydroxyl groups, etc. 1 For example, benzyl group, phenethyl group, trityl group, diphenylmethyl group, hydroxyethyl group, methoxyethyl group, cyanoethyl group, acetoxyethyl group, acetylethyl group, chloromethyl group, styryl group. group, cinnamyl group, etc. In addition, the substituted or unsubstituted cyclic hydrocarbon group includes a monocyclic hydrocarbon group, a bridged hydrocarbon group, and a fused polycyclic hydrocarbon group, and the unsubstituted monocyclic hydrocarbon group includes:
Those having 3 to 12 members are preferable, and examples thereof include a cyclopropyl group, a cyclohexyl group, a phenyl group, and a cyclododecatrienyl group. The unsubstituted bridged hydrocarbon group preferably has 6 to 18 carbon atoms, and includes, for example, a cyclopentagenyl group, a norbornyl group, and an adamantyl group. Further, the unsubstituted condensed polycyclic hydrocarbon group preferably has 7 to 18 carbon atoms, such as naphthyl group, anthryl group, aniontolyl group, and indenyl group. Substituents of the substituted cyclic hydrocarbon group include methyl group, ethyl group, fluoro group, pro-7 group, cyano group, phenyl group, methoxy group, acyl group, niroto group, hydroxyl group, etc. Examples include tolyl group, xylyl group, cumenyl group, mesityl group, and methoxyphenyl group. Examples of anions include halogen anions such as fluorine, chlorine, bromine, and iodine; Acid anions, non-awI ions such as hydroxide ions, carboxylic acid ions such as acetate ions, oxalate ions, propionate ions, benzoate ions, sulfonate ions such as benzenesulfonic acid, fluorocarbons such as methoxy ions, ethoxy ions, etc. Examples include xyiion. (b) Salt of a tetravalent nitrogen-containing heterocyclic compound A tetravalent nitrogen-containing heterocyclic compound is a heterocyclic compound containing trivalent nitrogen in which the trivalent nitrogen is ionized. Other petro atoms include sulfur, oxygen, selenium, phosphorus,
Examples include the following, which may contain arsenic, silicon, germanium, boron, etc. The following margin (E) (P)R, l1m (1) (J) (K) Here, R1 and R2 represent a hydrogen atom, a substituted or unsubstituted cyclic or non-cyclic hydrocarbon group, for example, hydrogen, Examples include a methyl group, an ethyl group, a butyl group, a phenyl group, a benzyl group, etc., X- represents a 7-ion, and examples of the anion are as described above. In addition, each of the above (A) to (2) may have a substituent, such as a methyl group, an ethyl group, a chloro group, a pro-1 group, a cyano group, a methoxy group, an acyl group, a phenyl group, a nitro A hydrogen atom within the ring may be substituted with a group, a hydroxyl group, or the like. The present invention will be described in detail in the following margins. The photoreceptor of the present invention has a photosensitive layer on a conductive substrate, and the photosensitive layer has at least a charge generation layer. Preferred embodiments of the layer structure of the photoreceptor of the present invention include:
The following layer structures (1) to (8) can be mentioned. (1) As shown in FIG. 1, from the upper layer, the charge transport layer 3.
A charge generation layer 2 and a conductive substrate 1 are constructed in this order. (2) As shown in FIG. 2, in the layer structure shown in (1) above, an undercoat layer 4 (
(layers with functions such as intermediate layer, adhesive layer, etc.) (3) As shown in FIG. 3, from the upper layer, the charge generation layer 2,
A charge transport layer 3 and a conductive substrate 1 are constructed in this order. (4) As shown in FIG. 4, in the layer structure shown in (3) above, an undercoat layer 4 (
(layers with functions such as intermediate layer, adhesive layer, etc.) (5) As shown in FIG. 5, a charge generation layer 2A containing a charge generation substance and a charge transport substance from the upper layer. Charge transport layer 3. The conductive substrate 1 is constructed in this order. (6) As shown in FIG. 6, in the layer structure shown in (5) above, an undercoat layer 4 (
(layers with functions such as intermediate layer, adhesive layer, etc.) (7) As shown in FIG. 7, on the conductive substrate 1. Only a charge generation layer 2 in which a charge generation substance or a charge generation substance and a charge transport substance are uniformly dispersed or dissolved is formed. (8) As shown in FIG. 8, in the layer structure shown in (7) above, an undercoat layer 4 (
(layers with functions such as intermediate layer, adhesive layer, etc.) Further, in the above layer structure, an intermediate layer may be provided between each layer, and a surface protective layer may be formed as the uppermost layer. As conductive substrates, metals such as aluminum, brass, and stainless steel are used in the form of drums or in the form of sheet-like films or foils. Furthermore, metals such as polyethylene terephthalate, nylon, polyarylates, polyimides, and polycarbonates are used. It is used by molding an insulating material such as a molecular material or hard paper into a drum shape or by applying a conductive treatment to a sheet-like film. Methods for conductive treatment include impregnation with conductive substances, lamination of metal foil (e.g. aluminum foil), metal (e.g. aluminum, indium, tin oxide,
There are methods such as vapor deposition of yttrium, etc.) and conductive processing. Materials that can be used for the undercoat layer include metal oxides such as aluminum oxide, indium oxide, and titanium oxide, as well as acrylic resin and methacrylic resin. Vinyl chloride 1. Vinyl acetate resin, epoxy resin, urethane resin, polyester resin, phenol resin, fluorocarbon resin, polycarbonate resin, silicone resin, melamine resin, polyvinyl formal resin, polyvinyl butyral resin, polyvinyl alcohol resin, vinyl chloride-vinyl acetate resin Polymer materials such as polymers, vinyl chloride-vinyl acetate-maleic anhydride copolymers, vinylidene chloride-acrylonitrile copolymers, styrene-butadiene copolymers,
Celluloses such as ethyl cellulose and carboxymethyl cellulose are used, and each can be used alone or in combination of two or more. The undercoat layer is formed to a predetermined thickness by dissolving the above-mentioned material in an appropriate solvent and coating the solution on the conductive substrate. As for the coating method, when the conductive substrate is drum-shaped,
A dipping method, a spray method, an extrusion method, a slide hopper method, etc. are preferred, and when the conductive substrate is in the form of a sheet,
A roll method, extrusion or slide hopper method is preferably employed. What is the thickness of the undercoat layer formed in this way? The range of 0.01 to 101L is preferable, and the range is 0.05 to 5
A range of 100% of the intestine is more preferred. A photosensitive layer having at least a charge generation layer is formed on the subbing layer. The TrL charge generation layer is preferably formed by coating a charge generation substance alone or dispersed in a binder on a conductive substrate. Examples of charge-generating substances include guaiazulene pigments (for example, JP-A-59-53850), perylene-based pigments (for example, JP-A-59-24852 and JP-A-47-30330), and phthalocyanine pigments (for example, JP-A-53-9536 and JP-A-Sho 53-9536). 59
-9537), biryllium pigments (e.g. No. 53-4
No. 0531), quinacridone pigments (e.g. No. 47-3
No. 0332), indigo pigments (e.g. No. 47-303), indigo pigments (e.g. No. 47-303
No. 31), cyanine pigments (e.g. No. 54-21343)
No. 58-194035, No. 58-115447, No. 59-723757, No. 5
No. 9-72376, No. 59-73820), and specific examples include the following compounds. The following margins (G-1) (G-2) (G-3) 1 1 Flat Φ Φ RO 1 - NO Φ 0 As a means for dispersing the charge generating substance, the charge generating substance is added to a suitable solvent or binder solution. In addition, known dispersion means such as a sand mill, ball mill, and ultrasonic dispersion can be used. As a binder, acrylic resin, methacrylic resin, polyester resin, polycarbonate)4
Polymer materials such as N resin, styrene resin, polyvinyl alcohol resin, and polyvinyl butyral resin are used. Suitable solvents include 1,2-dichloroethane, chloroform, 1,1.1-)lichloroethane, dichloromethane, acetone, dioxane, methyl ethyl ketone, tetrahydrofuran, benzene, toluene, xylene, diethyl ether, and the like. The mixing ratio of the charge generating substance and the binder is 0 to 500 parts, preferably 0 to 200 parts, per 100 parts of the charge generating substance. The charge generation layer contains the compound of the present invention.
Representative examples of the compounds of the present invention include the following exemplified compounds. [Exemplary compounds] Bleached "n-01H7-&3 ote (b) n-OpHq-NH201e (2) ee n-0,H,, -NH,Ol Φ e" n-0L4J (29NH50j e 04 n%@Ha7NHBOI ( 2)σ翫at0 濽(0□Hs+SNHQt (2) ′ee ("-4H4)3NHPF. (To) (nbehHff+3NHOl-" →, H WhzPF? (Second -C+H NH3H3O+) (Foundation)
tL CφH9NHz N03 (b) ・ 0 Thank you-CbHqN H304CZ. e H+0 e9) 7L-CyH,7NH3CSOaΦ Cf,) tL CeHzgNH) CH3CH
zCOODI) 'L-CsH@NH3')L C+
zHirCOO02)vt-(4Hz9N Ha
CH3CHzCOOΦ gl x-CtHrlN+CHy)1
c1Q Nori t-Ca) LIT N+CH333
B-cho■ ” ')'L' Cl21 HzsN + CH3)
3 I 0"?') (CzHWestN CzHt
O6CHx9SOa \. Compounds with H2CH2/1 are 1 e.g. Org, 52nJo11.4-
p. id, 4. 2 can be synthesized by methods described in the literature such as p, 5lEI, etc., and 2 can also be synthesized by general synthetic methods. The general synthesis method includes adding hydrochloric acid gas, hydrochloric acid,
Sulfuric acid, nitric acid, boric acid, hexafluorophosphoric acid, perchloric acid,
It can be easily synthesized by adding carboxylic acids such as phosphoric acid and acetic acid, and benzosulfonic acid and sulfonic acid. Commercially available products include those manufactured by Tokyo Kasei Dosei, Kanto Kagaku Co., Ltd., and Wako Tsumugi Kogyo Co., Ltd. The amount of the compound of the invention added is 0 per 100 weight of the charge generating substance.
．． It is 1 part by weight or more and 15 parts by weight or less. --Preferably 1 to 12 parts by weight. If it is less than 0.1 part by weight, the effect of the present invention will be poor, but if it exceeds 15 parts by weight, problems will arise in moisture resistance. Addition and usage methods include adding it to the solvent when dispersing the charge generating substance, dissolving it in the solvent when dispersing the charge generating substance, and adding it to the dispersion liquid in which the charge generating substance is dispersed. Any method used may be used. The charge transport layer is formed by dissolving a charge transport material and a binder in a suitable solvent and coating the mixture on the charge generation layer. Examples of the charge transport substance include triazole derivatives (for example, Japanese Patent Publication No. 34-5487), oxazole derivatives (for example, Japanese Patent Publication No. 35-1125), oxadiazole conductors (for example, Japanese Patent Publication No. 34-5466), and pyrazoline derivatives (for example, Japanese Patent Publication No. 34-5466). 10366), imiguzol derivatives (for example, JP-A No. 35-11215, JP-A No. 37-16096), fluorenone rust conductors (JP-A-52-128373, JP-A-54-
No. 11G837), carbazole derivatives (e.g. No. 54
-59142) and also No. 58-134642, No. 58
-65440 etc. are mentioned. Specifically, the following compounds may be mentioned. Preferred charge transport materials in the present invention include: Examples include compounds represented by the following general formulas (1) to (7)K. General formula (1) General formula (2) General formula (3) General formula (4) General formula (5) General formula (7) In the above formula -Rg-Ra←R snow~R341B, -~-1R chicken~ 1゜'B, , n, , ~B5B are a hydrogen atom, an alkyl group, an alkoxyΦ group, a haggone atom, a hydrexy group, and a cyano group. A phenyl group which represents a dialkylamino group, a diarylamino group, a dialkylamino group, or a nitro group, and R, where R is an alkyl group, may have a substituent.・Or represents a naphthyl group which may have a substituent. Fusion is a hydrogen atom, an alkyl group, a cyano group,! 1 or 7-enyl group which may have a substituent, the nod represents a hydrogen atom, and g
1 represents a phenyl group, a cyano group, or an alkyl group which may have a substituent. In the formula, R'j9+ R4a + R represents an alkyl group, benzyl group, phenyl group or naphthyl group (each may have a substituent...), and R6L is a hydrogen atom. Alkyl group, alkoxy group, hapgen atom, hydroxy group, dialkylamino group 0 represents a nido group;
B represents a hydrogen atom or a phenyl group. Below, specific examples of primary compounds are mentioned. As a binder, it has high compatibility with charge transport substances,
In addition, materials with high transparency and insulation properties are preferred, and all materials commonly used for photoreceptors can be used. For example, polyester resins, polyethylene resins, polyamide resins, polycarbonate resins, epoxy resins, polyvinyl butyral resins, and Methyl methacrylate resin or the like is used. The content of the charge transport substance is 2 parts per 100 parts of the binder.
The amount is 5 to 200 parts, preferably 50 to 100 parts. The charge generation layer and the charge transport layer can be coated by the same method as the undercoat layer described above, and the thickness of the charge generation layer is 0.01 to 1.
0% layer is preferable, more preferably 0.05~21L■
The charge transport layer is preferably a 5 to 50 JL layer, more preferably! 0 to 3 and 1. [Advantageous Effects of the Invention 1] According to the present invention, it is possible to greatly improve the edge reversal characteristics without reducing the sensitivity, and to obtain a photoconductor with no dispersion in performance of a plurality of photoconductors produced over time. can. (Example 1 Preferred examples of the present invention are shown below, but the present invention is not limited thereto. Example 1 10 g of polyvinyl formal resin was mixed with inpropanol.
Dissolved in 100100O and dipped on an aluminum plate (
W! The polycarbonate resin was coated using the dipping method to form an undercoat layer with a thickness of approximately Q, 154 m.
Product name: Panlight L-1250, manufactured by Kijin Kasei Co., Ltd.) 5
g, as a charge generating substance (G-7) 10 g, 1.2-
Dichloroethane 1000+li was pulverized and dispersed in a ball mill to obtain a dispersion. 1.0 g of Exemplified Compound (No. 2) was added to the obtained dispersion, and after stirring for about 1 hour, it was applied onto the subbing layer by a dip method, and dried at 100° C. for 10 minutes to achieve a film thickness of 0.
．． 2. A final charge generation layer was formed. Zarani, polycarbonate resin (product name: Panlite K
-1300, manufactured by Kijin Kasei Co., Ltd.) 150 g, charge transport substance (a) 75 g and 1,2-dichloroethane 1000 r
It was dissolved in an, coated on the charge generation layer by a dip coating method, and dried at 110° C. for 20 minutes to give a film thickness of 211.
A charge transport layer of L11 was formed. The photoreceptor thus obtained is referred to as sample 1. Example 2 Same as Example 1 except that (G-12) was used instead of (G-7) as the charge generating substance, the amount of the 5 exemplified compounds was changed to 0.2 g, and (d) was used as the charge transporting substance. A photoreceptor of the present invention was obtained. This is called sample 2. Example 3 10g of polyvinyl formal resin was dissolved in Impropanol LQOOmfL and aluminum was vapor-deposited on PE.
A 0.18 μm thick undercoat layer was formed on the T base using a roll coater. Next, polycarbonate resin (product name: Panrai) L
-1250, manufactured by Kijin Kasei Co., Ltd.) 5 g, as a charge generating substance (G -12) 10 g, 1,2-dichloroethane 1
A sample of 000 m was pulverized and dispersed in a ball mill to obtain a dispersion i. 0.4 g of exemplified compound (No. 5) was added to the obtained dispersion.
After stirring for about 1 hour, a charge generation layer having a thickness of 0.18 p, ts was formed on the undercoat layer by a wire bar coating method. Furthermore, 150 g of polycarbonate resin (trade name: Panlite ni-1300, manufactured by Kijin Kasei Co., Ltd.), 75 g of charge transport substance (d), and 1000 ta of 1,2-dichloroethane were added.
The solution was dissolved in n and coated on the charge generation layer using a roll coater coating method, and dried at 110°C for 20 minutes to obtain a film thickness of 2.
A charge transport layer of 14 m was formed. The photoreceptor thus obtained is referred to as sample 3. Example 4 In Example 3, instead of the exemplified compound (No. 5), (No. 17) was used, and the amount of the exemplified compound was 0.8 g.
A photoreceptor of the present invention was obtained in the same manner as above. This is called sample 4. Example 5 In Example 3, exemplified compound (No, 2) was used instead of exemplified compound (NO, 5), and the amount of 1 exemplified compound was 0.4 g.
A photoreceptor of the present invention was obtained in the same manner as above. This is called sample 5. Example 6 In Example 3, (No, 20) was used instead of the exemplified compound (NO, 5), and the amount of the exemplified compound was 0.4 g.
A photoreceptor of the present invention was obtained in the same manner as above. This is called sample 6. Example 7 A photoreceptor of the present invention was obtained in the same manner as in Example 3 except that exemplified compound (No. 21) was used instead of exemplified compound (No. 5), and the amount of exemplified compound was 0.4 g. This is sample 7
shall be. Example 8 In Example 3, instead of 1 exemplified compound (NO, 5), (No, 30) was used, and the amount of 1 exemplified compound was 1.2 g.
A photoreceptor of the present invention was obtained in the same manner as above. This will be referred to as sample 8. Example 9 A photoreceptor of the present invention was obtained in the same manner as in Example 3 except that (No. 32) was used instead of the exemplified compound (NO. 5) and the amount of the exemplified compound was 1.0 g. This is sample 9
・Suppose. Example 1G In Example 3, (No, 48) was used instead of the exemplified compound (NO, 5), and the amount of the exemplified compound was 0.4 g.
A photoreceptor of the present invention was obtained in the same manner as above. This is designated as sample 10. Example 11 In Example 3, instead of exemplified compound [N005), (No. 87) was used, and the amount of one exemplified compound was 0.4 g.
A photoreceptor of the present invention was obtained in the same manner as above. This is designated as sample 11. Example 12 10g of polyvinyl formal resin was added to Improper Tool 1
PET dissolved in 00100O and vapor-deposited with aluminum
The coating was applied onto the base using a roll coater to form an undercoat layer having a thickness of 0.18 pm. Next, polycarbonate resin (product name: Panrai) L
-1250, manufactured by Kijin Kasei Co., Ltd.) 58, as a charge-generating substance (G-12) 10 g, and exemplified compound (NO, 5) 0.
4g of 1,2-dichloroethane was pulverized and dispersed in a ball mill to obtain a dispersion. The resulting dispersion was coated on the undercoat layer with a wire bar coating method to achieve a film thickness of 0.
．． A charge generation layer of 4ts of 1B was formed. Others are Example 3
A photoreceptor of the present invention was obtained in the same manner as described above. This is sample 1
Set it to 2. Example 13 In Example 12, instead of exemplified compound (NO, 5), □1o-17) was used and the amount of 1 exemplified compound was 0.8
g. A photoreceptor of the present invention was obtained in the same manner as above. This will be referred to as sample 13. Example 14 In Example 12, (No, 21) was used instead of the exemplified compound (NO, 5), and the amount of the exemplified compound was changed to 0.8.
g. A photoreceptor of the present invention was obtained in the same manner as above. This will be referred to as sample 14. Comparative Example 1 A comparative photoreceptor was obtained in the same manner as in Example 3, except that the exemplified compound (NO, 5) was not used. This is designated as comparative sample 1. Comparative Example 2 A comparative photoreceptor was obtained in the same manner as in Example 3, except that the same amount of diethylamine was used instead of the exemplary compound (NO, 5). This will be referred to as comparative sample 2. Comparative Example 3 In Example 3, tellurium diethyldithiocarbamate (JP-A-59-15
A comparative photoreceptor was obtained in the same manner except that 3 g of the compound disclosed in Publication No. 7) was used. This will be referred to as comparative sample 3. Comparative Example 4 0.2 g of charge generating substance (G-12) was dissolved in 50 g of denatured ethanol. Next, 1.0 g of a cationic copolymer represented by the following structural formula
and 0.05 g of 2,2'-7zobis-2-7minopropane dihydrochloride were added and dissolved at room temperature, and immediately coated on a support with 1O2 AI foil deposited on a bed of 80 ILm using the Dr. Plaid coating method. Heat drying was performed at about 85° C. for 2 minutes. (The numbers in the above structural formula represent mol % of one unit of each monomer.) In this way, a charge generation layer having a film thickness of 0.3 l was obtained. (
(See Example 1 of JP-A-511-18831) Next, the charge transport layer used in Example 3 was coated on this charge generation layer to obtain a photoreceptor. This will be referred to as comparative sample 4. Comparative Example 5 Based on Example 3, 2.5 g of the exemplified compound (NO, 5)
A comparative photoreceptor was obtained in the same manner except that the same was used. This will be referred to as comparative sample 5.

【evaluation】

Each sample obtained above was evaluated as follows. Using Paper Analyzer 5P-428 (manufactured by Kawaguchi Electric Co., Ltd.), it was charged for 5 seconds under the discharge condition of 40 ILA, and
Surface potential immediately after charging [val, surface potential after being left in the dark for 5 seconds [vl] 1 Exposure to surface illuminance of 2 lux, exposure amount until surface potential becomes 1/2 V+ [El/2 ] (Lux°5ec), and further, the dark decay rate [0] was determined from the formula of Va. Table these results.
Shown in 1. Further, a normal curling process was performed using Samples 1 to 14 and Comparative Samples 1 and 2, and the difference in surface potential immediately after charging at the initial stage and after 1000 times [ΔVb] and the residual potential after 110,000 times [vr'] was determined. Furthermore, the value of the surface potential VW after irradiation with a constant amount of light after the initial 10,000 times was determined. These results are shown in Table-2. Table 1 Table 2 As can be understood from these tables, the photoreceptor of the present invention has almost no decrease in sensitivity, has excellent green reversal properties, is stable in storage stability, and is stable in manufacturing. It turns out that it can be used. Comparative Example 6 The dispersions obtained in Example 2 and Comparative Example 2 were applied every 24 hours for 4 days to obtain photoreceptors in the same manner. Sample these 15.18.1? , 18 and comparative samples 6.7 and 8.9. For these samples, [Val, [V1], [E1/2]
(Lux-see); [D] was measured. The results are shown in Table-3. Comparative Example 7 - Samples 4.5.6, 7 and Comparative Sample 3.5 were stored for one month in an environment with a temperature of 50°C and a relative humidity of 80%, and then these samples were subjected to the above-mentioned method to determine [Va], [ v+ 1, CEIt21 (Lux
-sec), [01 was measured. The results are shown in Table 4. Table-3 Table-4

[Brief explanation of drawings]

1 to 8 are schematic sectional views showing embodiments of the layer structure of the photoreceptor of the present invention. Patent applicant Roku Konishi Photo Industry Co., Ltd. Agent
Patent Attorney Nobuaki Sakaguchi (and 1 other person) @Figure 1 iIZ Figure 3 Figure 4 S 5 8 Essay 6 8 Essay 7 Reason Figure 8

Claims (3)

[Claims] (1) In a photoconductor having a layer containing at least a charge generating substance on a conductive substrate, a low molecular weight ammonium salt is added in the photoconductor at 0.1 parts by weight per 100 parts by weight of the charge generating substance.
A photoreceptor containing at least 15 parts by weight. (2) The photoreceptor according to claim 1, wherein the low molecular weight ammonium salt is represented by the following general formula I. (General Formula I) ▲Mathematical formulas, chemical formulas, tables, etc.▼ (In the formula, R_1 is a substituted or unsubstituted acyclic hydrocarbon group,
Represents a substituted or unsubstituted cyclic hydrocarbon group, R_2 to R
_4 is a hydrogen atom, a substituted or unsubstituted acyclic hydrocarbon group,
It represents a substituted or unsubstituted cyclic hydrocarbon group, and X^■ represents an anion. ) (3) The photoreceptor according to claim 1, wherein the low molecular weight ammonium salt is a salt of a tetravalent nitrogen-containing heterocyclic compound.