JPH0844088A - Photoreceptor and image forming method using same - Google Patents

Abstract

PURPOSE:To improve the adhesive property of a photoreceptive layer to the substrate even when continuous paper is used by interposing an undercoat layer between the photoreceptive layer and the substrate and using specified polycarbonate resin as the resin binder of the photoreceptive layer. CONSTITUTION:An undercoat layer and a photoreceptive layer are laminated on a drum-shaped substrate having 380-600mm length to obtain the objective photoreceptor. At this time, polycarbonate resin represented by formula I or II is used as the resin binder of the photoreceptive layer. In the formula I, each of R1-R4 is H, halogen, alkyl, aryl or cycloalkyl, (n) and (m) show molar ratio, n+m=1, and 0<=n<=0.8. In the formula II, each of R1-R4 is H, halogen, alkyl, aryl or cycloalkyl, (x) and (y) show molar ratio, x+y=1 and 0.1<=x<=0.9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a long photosensitive member used in an image forming apparatus for printing a clear and high image density bar code on continuous paper by an electrophotographic method, and an image forming method using the same. Regarding

[0002]

2. Description of the Related Art In recent years, electrophotographic image forming apparatuses have been used for various purposes, for example, as industrial special machines for printing patterns such as bar codes. In addition to ordinary characters, information for computer input is visually recorded in the form of a bar code on recording paper, articles, etc., and the bar code recorded information is optically read and input to the computer when needed. By doing so, a simple and reliable method of inputting is used in various fields including reading of product information in a POS system.

Device for printing patterns such as bar codes
In the following (hereinafter, referred to as “bar code printer”), it is desired that the same array pattern can be quickly obtained in a large amount. In order to satisfy this, it is considered to continuously print at high speed using a wide paper or continuous paper so that more patterns can be arranged. Further, the lengthening of the photoconductor is considered so that it can be applied to wide paper.

[0004]

In the bar code pattern, fine lines are regularly arranged, and from the viewpoint of image formation, the bar code part requires a larger amount of toner than the normal character part. High density. When printing a barcode pattern, a lot of image noise occurs,
When the reproducibility of the fine line is poor, a clear barcode pattern cannot be obtained, and a reading error occurs or reading becomes impossible. Therefore, the bar code printer is required to have higher image quality reliability and repetitive stability than those of a device for printing characters.

Therefore, a photosensitive member having a length of 350 mm or less, which is used in an ordinary image forming apparatus, is simply lengthened,
When it is diverted to a bar code printer, the following problems occur.

As a photoreceptor incorporated in an electrophotographic image forming apparatus, it is safer than inorganic materials such as selenium, cadmium sulfide, and zinc acid value, and has the advantages of film-forming property, light weight, and cost. Therefore, an excellent organic photoreceptor is useful.
However, the organic photoreceptor has a drawback that it has a low surface hardness and is susceptible to scratches, abrasion, and deterioration due to mechanical or physical external force.

In many cases, a bar code printer uses continuous paper that is roll-shaped or has perforations for separation for continuous printing day and night for ease of pattern formation and handling. For this reason, the contact time between the paper and the surface of the photoconductor is longer than that in a normal electrophotographic copying machine or printer using cut paper, and the surface of the photoconductor is greatly affected. In addition, continuous paper is generally about 2 to 10 times thicker than cut paper. As the system speed (peripheral speed of the photosensitive drum) is increased to obtain the same array pattern quickly and in large quantities, and the thicker continuous paper is used, the influence on the surface of the photosensitive member is further increased. May cause peeling of the photosensitive layer.

The organic photoreceptor is usually manufactured by coating. Due to manufacturing characteristics, a long photoreceptor has a difference in film thickness above and below the photosensitive layer, and it is difficult to obtain a uniform coating film. Therefore, uneven image density and streak-like noise appear on the top and bottom of the photoconductor. Further, as the length of the support increases, the dimensional accuracy deteriorates, and the contact force with the sleeve, the blade cleaner, or the like when assembled in the apparatus partially increases. Therefore, in the part where high stress is applied to the surface of the photoconductor,
The high adhesiveness between the photosensitive layer and the support is deteriorated, and the photosensitive layer is liable to peel due to friction between the photosensitive body and the transfer sheet.
This tendency becomes larger as the drum diameter of the support becomes smaller and as the photosensitive layer becomes thicker. Therefore,
In particular, when the photosensitive layer is made thicker or the drum diameter of the support is made smaller, it is necessary to improve the adhesiveness as compared with an ordinary photosensitive body.

As described above, when the photoconductor used for cut paper is simply diverted to a label printer using continuous paper, abrasion of the photosensitive layer due to repeated use, Peeling or partial scraping occurs,
As a result, image noises such as black spots, white spots, and fog occur, and it becomes difficult to use the photoconductor for a long time.

From the above, a first object of the present invention is to provide a long photosensitive member which is excellent in adhesiveness between the photosensitive layer and the support even when continuous paper is used.

A second object of the present invention is to provide a long photosensitive member which is less likely to generate image noise even after repeated use over a long period of time and has excellent durability.

A third object of the present invention is to effectively prevent peeling of the photosensitive layer even when a long photosensitive member is used and an image is formed by continuously contacting the surface of the photosensitive member with the surface of the photosensitive member. An object of the present invention is to provide an image forming method capable of obtaining an excellent image.

[0013]

As a result of intensive studies to solve the above problems, the present inventor improved adhesiveness by providing an undercoat layer between the photosensitive layer and the support. , Found that by using a specific polycarbonate resin as a binder resin of the photosensitive layer, the coatability is improved during the production of the photosensitive member, and further, excellent mechanical properties and electrophotographic properties are maintained even when used for a long period of time, The present invention has been completed based on this finding.

That is, the photoconductor of the present invention is a photoconductor used in an image forming apparatus for forming an image by bringing continuous paper into contact with the surface of the photoconductor, and has a length of 380 mm or more and 600 mm.
An undercoat layer and a photosensitive layer are laminated on the following drum-shaped support, and a polycarbonate resin represented by the following general formula [I] or [II] is used as a binder resin of the photosensitive layer.

[0015]

[Chemical 3]

[In the formula, R _{1 to} R ₄ each independently represent hydrogen, a halogen atom, an alkyl group, an aryl group or a cycloalkyl group. R _{1 to} R ₄ may be the same group or different groups. n, m,
x and y each represent a molar ratio, n + m = 1, n = 0 to
0.8, x + y = 1, and x = 0.1 to 0.9. The peripheral speed of the image forming method of the present invention is 90 to 250 mm.
It is rotated at 1 / sec and is laminated with a subbing layer and a photosensitive layer on a drum-shaped support having a length of 380 mm or more and 600 mm or less, and is represented by the following general formula [I] or [II] as a binder resin for the photosensitive layer. After uniformly charging the surface of the photoreceptor using a polycarbonate resin to a predetermined potential, it is exposed to form an electrostatic latent image, and the toner image formed by visualizing this is electrostatically transferred onto continuous paper. It is characterized by

[0017]

[Chemical 4]

[In the formula, R _{1 to} R ₄ each independently represent hydrogen, a halogen atom, an alkyl group, an aryl group or a cycloalkyl group. In addition, R _{1 to} R ₄ may be the same group or different groups. n,
m, x, and y each represent a molar ratio, n + m = 1, n =
0 to 0.8, x + y = 1, and x = 0.1 to 0.9. In the present invention, when a long and small photosensitive drum is applied to an image forming apparatus using continuous paper, an undercoat layer is provided on a support and a specific polycarbonate resin is used as a binder resin for the photosensitive layer. As a result, a photoreceptor having excellent durability is provided, and coating unevenness and peeling of the photosensitive layer, which are peculiar to a long photoreceptor, are effectively prevented.

As the continuous paper, a roll-shaped one or a commercially available one having a perforation for separation can be used, but the photoreceptor of the present invention has a thickness of 5 to 15 mils.
It is very effective when using a small amount of paper. In addition, 1
mil represents a value of 1/1000 inch.

The photoreceptor of the present invention is constituted by forming the undercoat layer and the photosensitive layer on the drum-shaped support as described above.

For example, a subbing layer is formed on a support, and a photoreceptive layer formed by dispersing a charge generating material and a charge transporting material in a resin solution is formed thereon. A photosensitive layer formed by laminating a charge generation layer and a charge transport layer as a photosensitive layer thereon, a conductive layer and an undercoat layer are formed on a support, and a photosensitive layer is formed thereon. Or a photosensitive member obtained by sequentially laminating an undercoat layer, a photosensitive layer and a surface protective layer on a support.

As the support, copper, aluminum, iron,
A foil or plate made of nickel, stainless steel, etc., with a length of 380
mm or more and 600 mm or less, preferably 400 mm or more 5
50 mm or less. This is because if the length is too long, the difference in film thickness between the upper and lower layers becomes too large to obtain a clear image due to the manufacturing characteristics of the photosensitive layer, and if it is too short, the number of patterns arranged becomes small, which is a need for a barcode printer. Because it will disappear. A drum-shaped member having a diameter of 30 mm or more and 90 mm or less, preferably 40 mm or more and 80 mm or less is used. Also, those obtained by vacuum deposition or electroless plating of these metals on a plastic drum, or those provided with a layer of a conductive compound such as a conductive polymer, indium oxide or tin oxide by coating or vapor deposition on paper or a plastic drum. It can be used. Aluminum is generally used. For example, after extrusion processing, an aluminum pipe that has been subjected to drawing processing is cut, and the outer surface thereof is cut to about 0.2 to 0.3 mm using a cutting tool such as a diamond bite. Finished (cutting tube)
Alternatively, after deep-drawing an aluminum disc into a cup shape, the outer surface is finished by ironing (DI
Tube), aluminum disk impact-processed into a cup shape, and the outer surface finished by ironing
(EI pipe), extruded and then cold drawn (E
D tube) and the like. Further, those obtained by further cutting these surfaces may be used.

In forming the undercoat layer on such a support, an oxide film obtained by anodizing the surface of the support is used as the undercoat layer. When the support is an aluminum alloy, it is effective to use an alumite layer as the undercoat layer. Alternatively, a low resistance compound is dispersed in a solution in which a suitable resin is dissolved, and the solution or dispersion is applied onto the conductive support and dried. In this case, as the material used for the undercoat layer, polyimide, polyamide, nitrocellulose, polyvinyl butyral, polyvinyl alcohol and the like are suitable, and a low resistance compound may be dispersed in these resins. As the low resistance compound, metal compounds such as tin oxide, titanium oxide, zinc oxide, zirconium oxide and magnesium fluoride, and organic compounds such as organic pigments, electron-withdrawing organic compounds and organic metal complexes are preferably used. The thickness of the undercoat layer is 0.1-5μ
m, preferably about 0.2 to 3 μm.

When thick continuous paper is used or when plastic is used as the support, if the drum diameter of the support is 90 mm or less, the adhesion between the photosensitive layer and the surface of the support becomes extremely poor. Therefore, the problem of adhesion can be improved by setting the above-mentioned undercoat layer on the support. Furthermore, since the wettability of the coating liquid is improved by providing the undercoat layer, it is possible to perform uniform coating of the photosensitive layer described later even with a long support. When the photoconductor of the present invention is used in the reversal development method, it also effectively prevents the image noise generated by the charge injection from the support side.

The case where a charge generation layer and a charge transport layer are laminated as a photosensitive layer on the undercoat layer in the photoreceptor of the present invention will be described below.

In forming the charge generation layer on the undercoat layer, the charge generation material is vacuum-deposited, or dissolved in a suitable solvent and applied, or the pigment is combined with a suitable solvent or, if necessary, a binder. It is formed by applying and drying a coating liquid prepared by dispersing a resin in a solution. From the viewpoint of adhesiveness, those dispersed in a resin are preferable. The thickness of the charge generation layer is 0.01 to 2 μm, preferably 0.05.
Approximately 1 μm is desirable.

Examples of the charge generating material used in the charge generating layer include bisazo pigments, triarylmethane dyes, thiazine dyes, oxazine dyes, xanthene dyes, cyanine dyes, styryl dyes, pyrylium dyes, Azo pigments, quinacridone pigments, indigo pigments, perylene pigments, polycyclic quinone pigments, bisbenzimidazole pigments, indathlon pigments, squarylium pigments, phthalocyanine pigments, and other organic pigments and dyes. To be Other than these, any material can be used as long as it absorbs light and generates charge carriers with an extremely high probability, but disazo pigments and phthalocyanine pigments are particularly preferable.

The resin used together with this charge generating material is, for example, saturated polyester resin, polyamide resin, acrylic resin, ethylene-vinyl acetate copolymer, ion-crosslinked olefin copolymer (ionomer), styrene-butadiene block. Thermoplastic binder such as copolymer, polyarylate, polycarbonate, vinyl chloride-vinyl acetate copolymer, cellulose ester, polyimide, styrene resin, polyacetal resin, phenoxy resin, epoxy resin, urethane resin, silicone resin, phenol resin Use a thermosetting binder such as melamine resin, xylene resin, alkyd resin, or thermosetting acrylic resin, photocurable resin, photoconductive resin such as poly-N-vinylcarbazole, polyvinylpyrene, or polyvinylanthracene. Can

The above charge generating material is used together with these resins in alcohols such as methanol, ethanol and isopropanol, ketones such as acetone, methyl ethyl ketone and cyclohexanone, amides such as N, N-dimethylformamide and N, N-dimethylacetamide. , Sulfoxides such as dimethylsulfoxide, ethers such as tetrahydrofuran, dioxane, ethylene glycol monomethyl ether, esters such as methyl acetate and ethyl acetate, fats such as chloroform, methylene chloride, dichloroethylene, carbon tetrachloride, trichloroethylene, etc. A photosensitive coating solution prepared by dispersing or dissolving in a halogenated hydrocarbon group or an organic solvent such as benzene, toluene, xylene, ligroin, monochlorobenzene, dichlorobenzene It was applied onto the conductive support,
The charge generation layer is provided by drying.

The photoconductor of the present invention can be obtained by providing a charge transport layer containing a polycarbonate resin on the charge generation layer formed as described above.

The polycarbonate resin has the above-mentioned general formula [I].
Alternatively, it is a linear polymer containing one or more repeating units represented by [II] as a component. Specific examples of R _{1 to} R ₄ include halogen atoms such as fluorine atom, chlorine atom and bromine atom, methyl group, ethyl group, propyl group, butyl group, phenyl group and cyclohexyl group. By using such a polycarbonate resin as a binder resin, it is possible to obtain a photoreceptor having excellent sensitivity, repeatability, film-forming property, adhesiveness, coating film strength, and abrasion resistance.

The polycarbonate resin represented by the general formula [I] or [II] can be produced by a general polycarbonate synthesis method. For example, it can be obtained by reacting one or more dihydric phenols represented by the following general formula [III] with bisphenol A and phosgene.

[0033]

Embedded image

[In the formula, R _{1 to} R ₄ are the same as those in the general formula [I]. ] Specific examples of the dihydric phenols represented by the general formula [III] include, for example, 2,2-bis (3-methyl-4-hydroxyphenyl) propane and 2,2-bis (3-ethyl-4). -Hydroxyphenyl) propane, 2- (3-methyl-4-hydroxyphenyl) -2- (4-hydroxyphenyl) -propane, 4,4'-dihydroxybiphenyl,
3,3'-dimethyl-4,4'-dihydroxybiphenyl,
3,3 ', 5,5'-Tetramethyl-4,4'-dihydroxybiphenyl, 2,2-bis (2-methyl-4-hydroxyphenyl) propane, 2,2-bis (2-ter-butyl- Four
-Hydroxy-5-methylphenyl) propane, 2,2-
Bis (3-chloro-4-hydroxyphenyl) propane,
2,2-bis (3-fluoro-4-hydroxyphenyl)
Propane, 2,2-bis (3-bromo-4-hydroxyphenyl) propane, 2,2-bis (3,5-difluoro-4)
-Hydroxyphenyl) propane, 2,2-bis (3,5-
Dichloro-4-hydroxyphenyl) propane, 2,2-
Bis (3,5-dibromo-4-hydroxyphenyl) propane, 2,2-bis (3-bromo-4-hydroxy-5-
Chlorophenyl) propane, 2,2-bis (3,5-dimethyl-4-hydroxyphenyl) propane, 2,2-bis
(3,5-di-ter-butyl-4-hydroxyphenyl) propane, 2,2-bis (3-cyclohexyl-4-hydroxyphenyl) propane, 2,2-bis (3-phenyl-
4-hydroxyphenyl) propane, 2,2-bis (3-i
so-propyl-4-hydroxyphenyl) propane, 2,
2-bis (3-ter-butyl-4-hydroxyphenyl)
Propane, 2,2-bis (3-sec-butyl-4-hydroxyphenyl) propane, 2,2-bis (3-chloro-4)
-Hydroxy-5-methylphenyl) propane and the like.

Among these, 2,2-bis (3-methyl-4-hydroxyphenyl) propane and 2,2-bis are particularly preferable from the viewpoints of electrophotographic characteristics, abrasion resistance, coatability and adhesiveness.
(3,5-Dimethyl-4-hydroxyphenyl) propane, 2,2-bis (3-phenyl-4-hydroxyphenyl) propane, 4,4'-dihydroxybiphenyl, 3,
3'-dimethyl-4,4'-dihydroxybiphenyl, 3,
3 ', 5,5'-Tetramethyl-4,4'-dihydroxybiphenyl, 2,2-bis (3-cyclohexyl-4-hydroxyphenyl) propane, 2,2-bis (3-propyl-
4-hydroxyphenyl) propane, 2,2-bis (3-
Chlor-4-hydroxyphenyl) propane and the like are preferably used.

In the present invention, a polycarbonate resin having a viscosity average molecular weight of 1 × 10 ⁴ to 1 × 10 ⁵ , preferably 2 × 10 ⁴ to 8 × 10 ⁴ composed of various repeating units as described above is used. Used, more preferably 2 × 10 ⁴
A polycarbonate resin having a viscosity average molecular weight of ˜5 × 10 ⁴ and 4 × 10 ^{4 to} 6.5 × 10 ⁴ is mixed and used. When the viscosity average molecular weight is less than 1 × 10 ⁴ , the hardness of the film may be low and the durability may be poor. If the viscosity average molecular weight is larger than 1 × 10 ⁵ , the viscosity becomes high,
This is because the coatability is poor, the coating speed is significantly slowed, and a uniform film thickness distribution cannot be obtained. The viscosity of the polycarbonate resin is 100 to 350c.
It is preferable to use one having ps, preferably about 110 to 280 cps.

As the binder resin, polycarbonate resin and other resins such as polystyrene resin polymethacrylate resin, polyester resin, polyarylate resin,
You may use it, combining with a phenoxy resin etc. When the content of the polycarbonate resin is less than 50% by weight based on the total weight of the resin in the charge transport layer, the hardness of the entire layer is lowered, the durability is deteriorated, and the sensitivity is lowered. To adjust.
When two or more resins are used in combination, the viscosity of the entire resin is selected so as to fall within the above range.

The viscosity average molecular weights of the photoreceptors of the present invention are all values calculated from the intrinsic viscosity based on the following formula A.

[0039]

[Equation 1]

The intrinsic viscosity [η] is calculated from the measured value η _SP of a dichloromethane solution having a solute concentration of 0.7 g / 100 ml at a temperature of 20 ° C. using an Ostwald viscometer, and the formula of Schnell and Huggins below is calculated. It is calculated using.

[0041]

[Equation 2]

In forming the charge transport layer of the photoreceptor of the present invention, a coating solution obtained by dissolving a charge transport material and a polycarbonate resin in a suitable solvent is coated on the above charge generation layer, dry. The thickness of the charge transport layer is 5 to 60 μm, preferably about 10 to 50 μm. The content of the charge transport material in the charge transport layer is
Although it cannot be unconditionally specified depending on the kind, it is desirable to add about 0.02 to 2 parts by weight, preferably 0.5 to 1.2 parts by weight to 1 part by weight of the binder resin. In addition, you may use it in combination of 2 or more types of charge transport materials.

As the charge transport material in the charge transport layer, hydrazone compounds, pyrazoline compounds, styryl compounds,
Triphenylmethane compound, oxadiazole compound,
Carbazole compound, stilbene compound, enamine compound, oxazole compound, triphenylamine compound,
Various compounds such as a tetraphenylbenzidine compound and an azine compound can be used. When a small-diameter drum is used, the repeating cycle of electrostatic latent image formation on the same portion of the photoconductor during continuous copying becomes short, so that the generated charge carriers are erased by the erase light within the short time. It tends to be difficult to recover to the original state. And
At the time of charging, charge carriers remain in the charge transport layer or the charge generation layer, which may cause a phenomenon such as an increase in residual potential and a decrease in surface potential. The thicker the charge transport layer, the smaller the diameter of the drum, the faster the process speed, and the shorter the time required to form an electrostatic latent image on the same portion of the photoconductor, the more surface charge is canceled within that short time. A sufficient transfer speed of charge carriers in the charge transport layer and the charge generation layer is required. Therefore, the charge mobility of the charge transport layer is 2 × 10 ⁵ V / cm.
It is preferable to select the charge transport material so as to be 1 × 10 to ⁶ cm ² / V · sec or more under the above condition. Specifically, p-diphenylaminobenzaldehyde-N, N-
Diphenylhydrazone, N-methylcarbazole-3-
Aldehyde-N, N-diphenylhydrazone, pyrene aldehyde-N, N-diphenylhydrazone, 2-methyl-4-N, N-diphenylamino-β-phenylstilbene, α-phenyl-4-N, N-diphenylaminostilbene , Α-phenyl-4-N-phenyl-N-p-
Trilyvinylphenylaminostilbene, 5- [4-
(Di-p-tolylamino) benzylidene] -5H-dibenzocycloheptane, Nm-tolyl-N-phenyl-
N'-m-tolyl-N'-phenylbenzidine, 1,1,
4,4-bisdiethylaminotetraphenylbutadiene, the charge-transporting materials described in JP-A-3-136057, pages 3 to 5 and JP-A-4-364153, pages 3 to 9 alone or in combination of two or more. To use.

Examples of the solvent used for forming the charge transport layer include aromatic solvents such as benzene, toluene, xylene and chlorobenzene; ketones such as acetone, methyl ethyl ketone and cyclohexanone; and methanol.
Ethanol, alcohols such as isopropanol, ethyl acetate, esters such as ethyl cellosolve, carbon tetrachloride, carbon tetrabromide, chloroform, dichloromethane, halogenated hydrocarbons such as tetrachloroethane, tetrahydrofuran, ethers such as dioxane, dimethylformamide,
Examples thereof include dimethyl sulfoxide and diethylformamide. These solvents may be used alone or in combination of two or more as a mixed solvent.

The coating of the charge transport layer and the charge generation layer in the case of a photosensitive layer or a laminated layer can be carried out using various coating devices such as known ones. Specifically, various coating methods such as a dip coating method, a spray coating method, a spinner coating method, a blade coating method, a roller coating method and a wire bar coating method can be used.

In the photosensitive layer of the present invention, particularly in the case of lamination, an additive for improving film-forming property or flexibility, an additive for suppressing accumulation of residual potential, and the like are contained in the charge transport layer. Well-known additives may be included.

Specific examples of these compounds include halogenated paraffin, polychlorinated biphenyl, dimethylnaphthalene, o-terphenyl, m-terphenyl, p-terphenyl, diethyl biphenyl, hydrogenated terphenyl,
Plasticizers such as diisopropylbiphenyl, benzylbiphenyl, diisopropylnaphthalene, dibenzofuran, 9,10-dihydroxyphenanthrene, chloranil, tetracyanoquinodimethane, tetracyanoethylene, trinitroluolenone, dicyanobenzoquinone, tetrachlorophthalic anhydride, 3,5 Electron-withdrawing sensitizers such as dinitrobenzoic acid and cyanovinyl compounds, methyl violet,
Sensitizers such as rhodamine B, cyanine dyes, pyrylium salts and thiapyrylium salts can be used.

Since the internal stress of the layer decreases as the amount of the plasticizer added increases, when the photosensitive layer is formed by stacking the charge transport layer and the charge generation layer, the charge transport layer and the charge generation layer are combined. The adhesion between the photosensitive layer and the support in the case of a single layer type is improved. However, if too large, problems such as a decrease in mechanical strength and a decrease in sensitivity occur,
1 to 100 parts by weight based on 100 parts by weight of the charge transport material,
Preferably 5-80 parts by weight, more preferably 10-50
It is desirable that the amount is about parts by weight. The amount of the sensitizer added is 0.01 to 20 parts by weight, preferably 0.1 to 10 parts by weight, more preferably 0.1 to 100 parts by weight of the charge transport material.
It is desirable that the amount is about 5 to 8 parts by weight.

Further, the photosensitive layer in the photoreceptor of the present invention,
In particular, an antioxidant may be added to the charge transport layer for the purpose of preventing ozone deterioration. Examples of antioxidants include hindered phenols, hindered amines, paraphenylenediamines, hydroquinones, spirochromans, spiroindanones, hydroquinolines and their derivatives, organic phosphorus compounds, organic sulfur compounds and the like.

The larger the amount of the antioxidant added, the better the adhesiveness. However, if the amount is too large, problems such as a decrease in mechanical strength and a decrease in sensitivity occur. I can't. Therefore, 0.1 to 50 parts by weight, preferably 1 to 30 parts by weight, relative to 100 parts by weight of the charge transport material.
It is desirable to set the amount by weight, more preferably about 3 to 20 parts by weight. When the antioxidant and the plasticizer are used in combination, the total amount added is 1 to 120 parts by weight, preferably 5 to
The amount is 100 parts by weight, more preferably about 10 to 80 parts by weight. If the solubility of the plasticizer or antioxidant is low or the melting point is high, crystal precipitation may be caused or the adhesiveness may not be improved so much. Therefore, the melting point of the plasticizer or antioxidant is 1
It is preferable to use a compound having a temperature of 00 ° C. or lower.

The photoconductor of the present invention may have a conductive layer provided between the support and the undercoat layer. As the conductive layer,
Resin made by dispersing metal such as aluminum, iron, nickel in resin, or conductive metal oxide such as tin oxide, titanium oxide, antimony oxide, zirconium oxide, ITO (indium, tin oxide solid solution) Those dispersed therein are preferably used.

Further, the photoreceptor of the present invention may have a surface protective layer provided on the photosensitive layer. The thickness of the surface protective layer is preferably 5 μm or less. As the material used for the surface protective layer, polymers such as acrylic resin, polyaryl resin, polycarbonate resin, urethane resin, thermosetting resin, and photocurable resin are used as they are, or low resistance substances such as tin oxide and indium oxide are dispersed. It can be used. Further, an organic plasma polymerized film may be used as the surface protective layer. The organic plasma polymerized film is appropriately oxygen, nitrogen, halogen, Group 3 of the periodic table,
It may include a Group 5 atom.

The photoconductor of the present invention obtained as described above uses a laser, a light emitting diode (LED), an LCD shutter, a cathode ray tube, a PLZT shutter and the like as a light source, and an electrophotographic printer using continuous paper as a transfer paper. It is preferably used as a photoconductor for the.

The image forming method of the present invention using the above type photoreceptor will be described below.

FIG. 1 is a schematic view of a printer used for carrying out the image forming method of the present invention.

The photosensitive drum (1) of the present invention, which is an electrostatic latent image carrier, is provided at the upper right portion of the figure, and this drum is rotationally driven in the direction of the arrow in the figure by a driving means (not shown). Around the photosensitive drum (1), a corona charger (2), a developing device
(3), a transfer charger (4), a cleaning device (5) and an eraser (6) are sequentially arranged. An optical system (7) is arranged below the photosensitive drum. This optical system has a semiconductor laser generator, a polygon mirror, a toroidal lens, a half mirror, a spherical mirror, a folding mirror, a reflection mirror, etc. arranged in a housing (71) and faces a photoconductor of the housing (71). An exposure slit is formed in the portion, and the photosensitive drum (1) can be exposed from here through a space between the charging device (2) and the developing device (3). A paper feed tray (91) is provided in the lower part of the drawing, and a continuous paper (10) with perforations for separation is folded and stored. A fixing flash (8), a paper discharge roller pair (92), and a paper discharge roller pair (93) are sequentially arranged along the paper conveyance path (9).
The discharge tray (94) faces the (93).

According to this printer, the photosensitive drum (1)
The surface is uniformly charged to a predetermined potential (500 to 800 v) by the charger (2), and the charged area is exposed by the optical system (7) to form an electrostatic latent image. The exposure of the photosensitive drum is performed based on the image information from the controller (100). The formed electrostatic latent image is reversely developed by the toner charged in the developing device (3) with the same polarity as that of the photoconductor drum and frictionally charged to form a toner image, which is transferred to the transfer area facing the transfer charger (4). Transition. On the other hand, holes are continuously provided at both ends of the continuous paper 10 stored in the paper feed tray 91 along the transport direction. The sprocket device (90) hooks this hole, and the stepping motor automatically steps the continuous paper in a predetermined direction. The continuous paper is sent to the transfer area along the transport path. In the transfer area, the transfer charger (4) transfers an electrostatic charge having a polarity opposite to the charging polarity of the toner from the back surface of the paper, whereby the toner image on the photosensitive drum (1) is transferred onto the paper, and the fixing flash is used. After being fixed by (8), it is discharged to the discharge tray (94) by the pair of discharge rollers (93). After the toner image is transferred to the paper, the toner remaining on the photosensitive drum (1) is cleaned by the cleaning device (5), and the residual charge is erased by the eraser (6). This completes a series of image forming operations.

If the continuous paper used in the image forming method of the present invention is too thin, it is easily torn and it is difficult to increase the speed, and it is difficult to handle. If it is too thick, uneven transportation occurs or torque during transportation is increased. Because the increase in
About 3 to 15 mil is preferable. Regarding the system speed (peripheral speed of the photoconductor drum (1)), if the print speed of the pattern image is too slow to meet the needs of a bar code printer if it is too slow, if it is too fast, the effect on the photoconductor surface is large. 90 to 250 mm / sec, and preferably 100 because it causes excessive abrasion and peeling and peeling of the photosensitive layer.
It is desirable to set in the range of up to 200 mm / sec. Thus, according to the image forming method of the present invention, a good image can be obtained for a long period of time even when continuous paper is used as the transfer paper.

[0059]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples as long as the gist thereof is not exceeded. In the following, "part"
Indicates “parts by weight” unless otherwise specified.

Example 1 A long aluminum drum made of JIS6063 alloy whose surface was mirror-finished and having a diameter of 80 mm and a length of 400 mm was etched in a 1% sodium hydroxide aqueous solution at 30 ° C. for 5 minutes, and washed with water, It was immersed in 7% sulfuric acid at 25 ° C for 1 minute. After washing with water, 1.0A in 150g / l sulfuric acid electrolyte
Anodized at a current density of / dm ² and an average film thickness of 6 μm
(Barrier layer 300Å) anodized film (alumite layer)
Was formed. After washing with water, 10g / l of nickel acetate
After immersing in the above aqueous solution for 30 minutes at 80 ° C., it was pulled up and washed with pure water. The impedance of this drum is 85K
Ω. On the alumite layer, 1 part of titanyl phthalocyanine and 1 part of polyvinyl butyral resin (BX-1; manufactured by Sekisui Chemical Co., Ltd.) were dispersed together with 500 parts of cyclohexanone for 24 hours using a sand mill to prepare a dispersion liquid of a phthalocyanine compound in 400 parts of tetrahydrofuran. Diluted
It was applied so that the dry film thickness was about 0.2 μm, and dried to form a charge generation layer. Furthermore, the following formula on the charge generation layer
45 parts of diamino compound represented by [IV]

[0061]

[Chemical 6]

55 parts of a polycarbonate resin represented by the following formula [V] (viscosity average molecular weight 30,000, viscosity 120 cps):

[0063]

[Chemical 7]

1 part of a dicyanovinyl compound represented by the following formula [VI],

[0065]

Embedded image

A solution obtained by dissolving 5 parts of di-ter-butylhydroxytoluene in 400 parts of tetrahydrofuran was dip-coated so that the dry film thickness was 18 μm.
It was dried at 0 ° C. to prepare the laminated type photoreceptor of the present invention.

Example 2 Example 1 was repeated except that the binder resin used in the charge transport layer in Example 1 was replaced with a polycarbonate resin represented by the following general formula [VII] (viscosity average molecular weight 35,000, viscosity 165 cps). A laminated type photoreceptor of the present invention was manufactured in exactly the same manner as.

[0068]

[Chemical 9]

Example 3 The same as Example 1 except that the binder resin used in the charge transport layer in Example 1 was replaced with a polycarbonate resin represented by the following general formula [VIII] (viscosity average molecular weight 40,000, viscosity 225 cps). Similarly, a laminated photoreceptor of the present invention was produced.

[0070]

[Chemical 10]

Example 4 An aluminum drum made of JIS3003 alloy whose surface was cut and having a diameter of 80 mm and a length of 400 mm was etched in a 1% sodium hydroxide aqueous solution at 30 ° C. for 5 minutes, washed with water, and then at 25 ° C. Immersion in 1% nitric acid for 1 minute. After washing with water, anodic oxidation was performed in an electrolytic bath containing sulfuric acid of 7 vol% at 20 ° C ± 1 ° C at a bath voltage of 30 V and a current density of 1.2 A / dm ² to obtain an anodic oxide film having an average film thickness of 4 μm (barrier layer 420Å) Alumite layer) was formed. After washing the obtained aluminum drum with water, it was immersed in a 7 g / l nickel fluoride aqueous solution at 70 ° C.
And soaked for 10 minutes. After the immersion, the drum was pulled up and washed with pure water. The impedance of this drum is 120KΩ
Met.

On the alumite layer, 1 part of a trisazo compound represented by the following formula [IX],

[0073]

[Chemical 11]

Polyvinyl butyral resin (BX-1; manufactured by Sekisui Chemical Co., Ltd.) 0.5 part and phenoxy resin (PKHH; manufactured by Union Carbide Co., Ltd.) 0.5 part were dispersed together with 500 parts of cyclohexanone for 24 hours using a sand mill. Disperse the trisazo compound in tetrahydrofuran 40
The mixture was diluted with 0 part, applied so that the dry film thickness was about 0.2 μm, and dried to form a charge generation layer.

Further, the following formula [X] is formed on the obtained charge generation layer.
50 parts of a distyryl compound represented by

[0076]

[Chemical 12]

50 parts of a polycarbonate resin represented by the following formula [XI] (viscosity average molecular weight 40,000, viscosity 230 cps),

[0078]

[Chemical 13]

1 part of a dicyanovinyl compound represented by the following formula [XII],

[0080]

Embedded image

A solution of 10 parts of diter-butylhydroxytoluene and 400 parts of tetrahydrofuran was applied by dip coating so that the dry film thickness was 28 μm.
It was dried at 0 ° C. to prepare the laminated type photoreceptor of the present invention.

Example 5 In Example 4, the aluminum drum used for the support was a JI
A laminated type photoreceptor of the present invention was produced in exactly the same manner as in Example 4 except that the S3003 alloy having a diameter of 50 mm and a length of 500 mm was used.

Example 6 Made of JIS1100 alloy whose surface is mirror-finished,
An aluminum drum with a diameter of 60 mm and a length of 580 mm was washed with dichloromethane, the liquid temperature was 20 ° C., and the sulfuric acid concentration was 100 g / l.
In the electrolytic solution of No. ² , anodization treatment was performed at a current density of 2.5 A / dm ² for 10 minutes to form an anodized film (alumite layer) having a film thickness of 7 μm (barrier layer 800 Å). After further washing with water, it was immersed in an aqueous solution of nickel acetate 8 g / l at 90 ° C. for 10 minutes, then pulled up and washed with pure water. The impedance of this drum was 190 KΩ.

On this alumite layer, 0.5 parts of τ type metal-free phthalocyanine pigment, polyvinyl butyral resin (60
00C; manufactured by Denki Kagaku Kogyo Co., Ltd.) 0.5 parts by weight together with 500 parts by weight of tetrahydrofuran (THF) by a sand mill.
Dispersed for hours. The resulting dispersion was applied onto a long aluminum drum having an anodized film on the surface so that the dry film thickness was about 0.15 μm, and then dried to form a charge generation layer.

Furthermore, 50 parts of a styryl compound represented by the following formula [XIII],

[0086]

[Chemical 15]

And a polycarbonate resin represented by the following formula [XIV] (viscosity average molecular weight 38,000, viscosity 206 cps) 6
0 copies,

[0088]

Embedded image

1.5 parts of the above dicyanovinyl compound [VI],
And a solution of 7.5 parts of an antioxidant (Irganox 565: manufactured by Ciba-Geigy) dissolved in 450 parts of dichloromethane was applied so as to have a dry film thickness of 20 μm.
The charge transport layer was formed by drying at 0 ° C. In this way, a laminated type photoreceptor of the present invention having a photosensitive layer composed of two layers was produced.

Example 7 In Example 6, except that the aluminum drum used for the support was made of JIS 1100 alloy whose surface was mirror-cut, and had a diameter of 60 mm and a length of 450 mm. A laminated photoreceptor of the present invention was produced in exactly the same manner.

Example 8 Diameter 60 made of JIS6061 alloy whose surface is cut
A solution prepared by dispersing 100 parts of antimony oxide-containing tin oxide conductive fine powder in 75 parts of acrylic polyol and 6 parts of isocyanate in 230 parts of xylene on an aluminum drum having a length of 400 mm and a length of 400 mm has a dry film thickness of 3 μm. Then, it was heat-cured to form a conductive layer. next,
2 parts of triisopropoxyaluminum was added to a coating solution prepared by dissolving 10 parts of a polyamide resin (CM8000: manufactured by Toray Industries, Inc.) in 100 parts of butanol, and the solution was applied onto the conductive layer to form an undercoat layer having a dry film thickness of 1 μm. .

Next, a disazo pigment 1 represented by the following formula [XV]
Department,

[0093]

[Chemical 17]

Polyester resin (Byron 200; manufactured by Toyobo Co., Ltd.) 0.5 part and polyvinyl butyral resin (BX-1; manufactured by Sekisui Chemical Co., Ltd.) 0.5 part were dispersed together with 500 parts of cyclohexanone for 24 hours using a sand mill. Dispersion of disazo compound 1,4 dioxane 500
Part, diluted so as to have a dry film thickness of about 0.3 μm, and dried to form a charge generation layer.

Further, 50 parts of a diamino compound represented by the following formula [XVI] is formed on the charge generation layer,

[0096]

Embedded image

Polycarbonate resin represented by the following general formula [XVII] (viscosity average molecular weight 42,000, viscosity 260 cps) 60
Department,

[0098]

[Chemical 19]

A solution prepared by dissolving 2 parts of the dicyano compound [XII] and 10 parts of an antioxidant (Irganox 1010: manufactured by Ciba-Geigy) together with 15 parts of p-benzylbiphenyl in 400 parts of tetrahydrofuran was dried to a thickness of 35 μm. It was applied by dip coating as described above and dried at 110 ° C. to prepare a laminated photoreceptor of the present invention.

Example 9 Except that in Example 6, the aluminum drum used for the support was replaced with an aluminum drum having a diameter of 40 mm and a length of 420 mm, which was made of JIS6061 alloy whose surface was mirror-cut. Similarly, a laminated photoreceptor of the present invention was produced.

Example 10 A conductive polymer (Chemistat 6120, manufactured by Sanyo Kasei Co., Ltd.) 1 was placed on an aluminum drum having a diameter of 80 mm and a length of 400, made of JIS6063 alloy whose surface was mirror-cut.
Parts, 40 parts of titanium oxide powder (manufactured by Ishihara Sangyo Co., Ltd.) and 10 parts of polyamide resin (CM8000: manufactured by Toray) were dispersed in a sand mill together with 100 parts of methanol. The obtained coating liquid was applied onto the conductive layer to form an undercoat layer having a dry film thickness of 2 μm.

1 part of a disazo pigment represented by the following chemical formula [XVIII] on the undercoat layer:

[0103]

Embedded image

Polyester resin (Byron 200; manufactured by Toyobo Co., Ltd.) 0.5 part and polyvinyl butyral resin (BX-1; manufactured by Sekisui Chemical Co., Ltd.) 0.5 part were dispersed together with 500 parts of cyclohexanone for 24 hours using a sand mill. Dispersion of disazo compound 1,4 dioxane 500
Part, diluted so as to have a dry film thickness of about 0.3 μm, and dried to form a charge generation layer.

On the resulting charge generation layer, 50 parts of the diamino compound [IV] and a polycarbonate resin represented by the following formula [XIX] (viscosity average molecular weight 40,000, viscosity 234 cps) 5
0 copies,

[0106]

[Chemical 21]

A solution prepared by dissolving 2 parts of the dicyanovinyl compound [VI] and 10 parts of an antioxidant (Irganox 565: manufactured by Ciba-Geigy) in 400 parts of tetrahydrofuran was dip-coated so that the dry film thickness was 28 μm, 1
It was dried at 10 ° C. to prepare a laminated type photoreceptor of the present invention.

Comparative Example 1 JIS 6063 alloy diameter 80 with mirror-finished surface
A long aluminum drum having a length of 400 mm and a length of 400 mm was etched in a 1% aqueous sodium hydroxide solution at 30 ° C. for 5 minutes, washed with water, and then immersed in 7% sulfuric acid at 25 ° C. for 1 minute. After washing with water, anodic oxidation was performed in a sulfuric acid electrolyte solution of 150 g / l at a current density of 1.0 A / dm ² to form an anodic oxide film (alumite layer) having an average film thickness of 6 μm (barrier layer 300 Å).
After washing with water, add 8 g of nickel acetate to 10 g / l aqueous solution.
After soaking at 0 ° C. for 30 minutes, it was pulled up and washed with pure water. The impedance of this drum was 85 KΩ.

A thin film of titanyl phthalocyanine was vapor-deposited on the alumite layer by a vacuum vapor deposition method so as to have a film thickness of about 1000 Å to form a charge generation layer.

Further, 45 parts of the diamino compound represented by the above formula [IV] and 55 parts of a polycarbonate resin represented by the following formula (NOVAREX 7030A; manufactured by Mitsubishi Kasei Co., Ltd./viscosity average molecular weight 30,000, viscosity 105 cps) on the charge generation layer. For comparison, a solution prepared by dissolving 1 part of the dicyanovinyl compound [VI] and 5 parts of diter-butylhydroxytoluene in 400 parts of tetrahydrofuran was applied by dipping to a dry film thickness of 18 μm and dried at 110 ° C. A laminated photoreceptor was prepared.

[0111]

[Chemical formula 22]

Comparative Example 2 JIS 6063 alloy diameter 80 with mirror-finished surface
A long aluminum drum having a length of 400 mm and a length of 400 mm was etched in a 1% aqueous sodium hydroxide solution at 30 ° C. for 5 minutes, washed with water, and then immersed in 7% sulfuric acid at 25 ° C. for 1 minute. After washing with water, it was washed with pure water and dried. A thin film of titanyl phthalocyanine was vapor-deposited on this aluminum drum by a vacuum vapor deposition method so as to have a film thickness of about 1000 Å to form a charge generation layer.

Further, 45 parts of the diamino compound represented by the above formula [IV] and a polycarbonate resin represented by the general formula [V] were formed on the charge generation layer (viscosity average molecular weight 30,000, viscosity 120 cps).
55 parts, 1 part of the dicyanovinyl compound [VI] and G
A solution prepared by dissolving 5 parts of ter-butylhydroxytoluene in 400 parts of tetrahydrofuran was applied by dip coating so as to have a dry film thickness of 18 μm, and dried at 110 ° C. to prepare a laminated photoreceptor.

Comparative Example 3 JIS 6063 alloy diameter 80 whose surface is mirror-finished
mm, 400 mm in length, on a long aluminum drum, titanyl phthalocyanine is deposited by vacuum deposition to a film thickness of about 1000.
A thin film was vapor-deposited to form Å to form a charge generation layer.

Further, the diamino compound is formed on the charge generation layer.
[IV] 45 parts, polycarbonate Z resin represented by the following formula (Z-300; manufactured by Mitsubishi Gas Chemical Co., Inc./viscosity average molecular weight 3
10,000 parts, viscosity 123 cps) 55 parts, the dicyanovinyl compound
[VI] 1 part and diter-butylhydroxytoluene 5
A solution prepared by dissolving 400 parts of tetrahydrofuran in 400 parts of tetrahydrofuran was applied by dip coating so that the dry film thickness was 18 μm, and dried at 110 ° C. to prepare a comparative laminated-type photoreceptor.

[0116]

[Chemical formula 23]

Comparative Example 4 JIS 3003 Alloy Diameter 80 with Cutting Surface
mm, length 400 mm, on an aluminum drum, 1 part of the trisazo compound [VX], polyvinyl butyral resin (BX
-1; Sekisui Chemical Co., Ltd. 0.5 part, phenoxy resin (PK
0.5 parts of HH; manufactured by Union Carbide Co., Ltd.) and 500 parts of cyclohexanone were dispersed in a sand mill for 24 hours to dilute a dispersion liquid of a trisazo compound with 500 parts of tetrahydrofuran so that a dry film thickness becomes about 0.2 μm. And then dried to form a charge generation layer.

Further, 50 parts of the distyryl compound [X] and a polycarbonate Z resin (Z-300;
Mitsubishi Gas Chemical Company / viscosity average molecular weight 30,000, viscosity 123cp
s)) 50 parts, a solution prepared by dissolving 50 parts of the dicyanovinyl compound [VI] and 10 parts of diter-butylhydroxytoluene in 350 parts of tetrahydrofuran to give a dry film thickness of 28.
It was dip-coated so as to have a thickness of μm and dried at 110 ° C. to prepare a comparative laminated-type photoreceptor.

[0119]

[Evaluation]

(Evaluation of Electrostatic Characteristics) The obtained photoconductor was evaluated with θ = 45 ° using the photoconductor tester shown in FIG. While rotating the photosensitive member (56) at a peripheral speed of 200 mm / sec, the initial surface potential V ₀ (V) when the applied voltage of the charger (55) was corona-charged at -5 KV was applied to the potential probe (5).
2), and the exposure amount required for the surface potential to be attenuated to half of the initial surface potential by exposure (51) (hereinafter referred to as half exposure amount) E _1/2 (lux · sec), and 1 second Attenuation rate DDR ₁ (%) of initial potential when left in the dark,
The residual potential V _R (V) after erasing (50 lux · sec) was measured with an eraser (53). Table 2 shows the results.

7 obtained in Examples 1 to 4 and Comparative Examples 1 to 3.
For each type of photoreceptor, the surface potential V ₀ (V), the exposed portion potential V _i (V), and the residual potential V _R (V) were measured after the charging-exposure-erase process was performed 10,000 times. . The results are shown in Table 3. In Table 3, V ′ ₀ (V),
V _'i and V' _R (V) indicates the after 10,000 iterations.

Furthermore, Examples 1 to 4, Examples 8 and 10,
Regarding the 10 types of photoreceptors obtained in Comparative Examples 1 to 4,
The commercially available continuous paper label printer (LIS-1) shown in FIG.
520; manufactured by Esselmet Co., Ltd.), and the initial image characteristics of each photoconductor and the image characteristics after copying 10,000 pages were evaluated according to the criteria described later. The pattern image is B
A combination of a 12.5 mil barcode of UPC-A and a black solid pattern of 1 cm square was used. The results are shown in Table 4. As the paper, perforated paper having a thickness of 8 mil was used, and the part separated by the perforations was regarded as one page. One page of paper is 15 inches wide and 11 inches long. The system speed was 110 mm / sec.

Regarding the image characteristics of each photoconductor, black spots on white spots, rough spots on herb portions, black spots on half portions,
The image density (ID) of the solid black portion and the peeling of the photosensitive layer were evaluated according to the following criteria. Image density is all Sakura Densitometer
(Manufactured by Konica).

White spots: ○ No white spots with a size of 0.2 mmΦ or more △ Less than 10 white spots with a size of 0.2 mm to 0.8 mmΦ × Many white spots with a size of 0.2 mmΦ or more were measured. No Graffiti: ○ No density unevenness and no streak noise △ Dense unevenness and streak noise are confirmed, but there is no problem in practical use × Image density difference of 0.1 or more in ID Unevenness and streak noise are noticeable-No measurement Black spots: ○ No black spots of size 0.2 mmΦ or more △ Less than 10 black spots of size 0.2 mm to 0.5 mm Φ × Size 0 A large number of black spots of 0.2 mmΦ or more were generated-Not measured. Image density: ○ I.D. difference is 1.3 or more. △ I.D. difference is 1 to 1.3 × I.D. difference is 1.0 or less. − Not measured Peeling: ○ No peeling △ Peeling was observed in part but practical range × Peeling was observed over the entire surface Not practically-not measured (coating property evaluation) For each photoconductor prepared as described above, the difference in the film thickness of the photoconductive layer above and below the photoconductor (the part 3 cm apart from both ends) was measured, The results are shown in Table 4.

(Durability Evaluation) The amount of abrasion of each photoconductor after copying 1000 pages was measured and is shown in Table 4. The pattern image for copying was the same as that at the time of image characteristic evaluation, and the B / W ratio was 10%, and a combination of a UPC-A barcode 12.5 mil pattern and a 1 cm square black solid pattern was used.

(Evaluation of Adhesiveness) The adhesiveness of each photoconductor was measured by a cross-cut test. The measuring method is JIS K-5400.
It carried out according to the method of 6.15. The evaluation score of the cross-cut test was determined as shown in Table 1 below. The results are shown in Table 4.

[0126]

[Table 1]

[0127]

[Table 2]

[0128]

[Table 3]

[0129]

[Table 4]

As is clear from the results shown in Tables 2 to 4,
Excellent sensitivity and repeatability compared to the comparative example,
It was confirmed that it is suitable as a photoreceptor for a continuous paper printer, exhibits excellent image characteristics even after copying 10,000 pages, as in the initial stage, and has a sufficiently small film abrasion amount.
Further, it was confirmed that the photoconductors according to the examples of the present invention had a small difference in film thickness between both ends of the photosensitive layer.

[0131]

As described above in detail, in the present invention,
By forming a photosensitive layer containing a subbing layer and a specific polycarbonate resin, excellent adhesion between the photosensitive layer and the support even when using continuous paper, image noise is less likely to occur even after repeated use over a long period of time, It was possible to provide a long photosensitive member having excellent durability.

Further, it is possible to provide an image forming method capable of obtaining a good image for a long period of time without peeling of the photosensitive layer even when an image is formed by continuously contacting a paper with the surface of a long photosensitive member. did it.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an image forming apparatus for carrying out an image forming method of the present invention.

FIG. 2 is a schematic configuration diagram of a photoconductor tester.

[Explanation of symbols]

 1: Photoconductor drum 2: Corona charger 3: Developing device 4: Transfer charger 5: Cleaning device 6: Eraser 7: Optical system 8: Fixing flash 9: Conveying path 10: Continuous paper

Claims (2)

[Claims] 1. A photosensitive member used in an image forming apparatus for forming an image by contacting a continuous paper with the surface of the photosensitive member, wherein an undercoat layer and a photosensitive layer are provided on a drum-shaped support having a length of 380 mm or more and 600 mm or less. A photoconductor, which is formed by stacking layers and uses a polycarbonate resin represented by the following general formula [I] or [II] as a binder resin for the photosensitive layer. Embedded image [In the formula, R _{1 to} R ₄ each independently represent hydrogen, a halogen atom, an alkyl group, an aryl group or a cycloalkyl group. R _{1 to} R ₄ may be the same group or different groups. n, m, x, and y each represent a molar ratio, n + m = 1, n = 0 to 0.8, x +
y = 1 and x = 0.1 to 0.9. ] 2. Rotating at a peripheral speed of 90 to 250 mm / sec,
An undercoat layer and a photosensitive layer are laminated on a drum-shaped support having a length of 380 mm or more and 600 mm or less, and a polycarbonate resin represented by the following general formula [I] or [II] is used as a binder resin of the photosensitive layer. An image characterized by uniformly charging the surface of the photoconductor to a predetermined potential, exposing it to form an electrostatic latent image, and electrostatically transferring a toner image formed by visualizing it to a continuous paper. Forming method. Embedded image [In the formula, R _{1 to} R ₄ each independently represent hydrogen, a halogen atom, an alkyl group, an aryl group or a cycloalkyl group. In addition, R _{1 to} R ₄ may be the same group or different groups. n, m, x and y each represent a molar ratio, n + m = 1, n = 0 to 0.8, x
+ Y = 1 and x = 0.1 to 0.9. ]