JPH04108899A - Cutting oil and cutting of base material for electrophotography photoreceptor - Google Patents

Abstract

PURPOSE:To provide the subject cutting oil containing a specified amount of a specified-molecular weight component, having a specified viscosity, capable of ready and thorough cleaning and removal by non-contact cleaning such as ultrasonic cleaning or steam cleaning, and useful for cutting work of a base material for electrophotography photoreceptor. CONSTITUTION:An objective cutting oil containing >=1.0wt.% component having >=500 number-average molecular weight measured by gel permeation chromatography, having <=4.0cSt dynamic viscosity at 23 deg.C measured by using an SO type viscometer and composed of, e.g. a mixture of polybutene, a fatty hydrocarbon and kerosine or gas oil.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a cutting oil useful in cutting a conductive substrate material used in an electrophotographic photoreceptor having a photosensitive layer on a conductive layer, and the above-mentioned cutting oil. The present invention relates to a method for cutting conductive substrate materials.

[Conventional technology]

An electrophotographic photoreceptor has a laminated structure in which a photosensitive layer is coated or deposited on a conductive substrate, and is used by being mounted on a copying machine, a laser beam printer, and the like. Examples of conductive substrate materials used in electrophotographic photoreceptors include electrically conductive treated paper or plastic films, plastic films laminated with metal foil such as aluminum, metal plates, metal drums, and the like. The most commonly used type is a cylindrical metal drum (hereinafter abbreviated as a blank tube). A base tube is made of metal made into a round shape by impact molding, extrusion processing, drawing processing, etc. Thereafter, the surface is polished to an angle of 0°1 to 1° by cutting, etc., depending on the image characteristics of the copying machine, laser beam printer, etc. used. It is often used after finishing it into O3. The raw pipe formed in this way is stored after removing dirt generated during processing by simple cleaning (hereinafter referred to as rough cleaning) or by applying oil to protect the surface and prevent rust. used. The surface of the raw tube is contaminated with metal powder generated during the cutting process, dust from the surrounding environment, oil used during cutting, and oil used to protect the surface of the raw tube after cutting. ing.

It is known that when an electrophotographic photoreceptor is formed by applying a photosensitive layer to such a raw tube, the deposits on the surface of the raw tube have an adverse effect on the image characteristics and electrophotographic characteristics of the photoreceptor.

For this reason, in the photoreceptor manufacturing process, the raw tube is generally cleaned to remove deposits on the surface before laminating the photosensitive layer.

[Problem to be solved by the invention]

Non-contact cleaning methods such as ultrasonic cleaning and steam cleaning are common as methods for cleaning raw tubes in the conventional manufacturing process of electrophotographic photoreceptors. When a non-contact cleaning method is used, it has the advantage that it can be cleaned without damaging the surface of the raw tube. However, with this method, metal powder generated during cutting of the raw pipe, so-called chips, dust that adheres to the surface of the raw pipe during the process from processing to cleaning, and protection of the raw pipe surface during machining and cleaning. In some cases, the oil used in the pipes could not be completely removed and remained on the surface of the pipe.

If a photosensitive layer is applied with the above-mentioned deposits remaining on the surface of the raw tube to form a photoreceptor, image characteristics will deteriorate due to the occurrence of dark spots, fog, etc.

A contact cleaning method is a method that more reliably removes deposits on the surface of the tube than the non-contact cleaning method. Specifically, it involves soaking a member such as a brush or rag in cleaning liquid and cleaning the material from the tube. Proposed methods include rubbing the raw pipe by pressing it against the surface, rubbing the surface of the raw pipe with a material while applying cleaning liquid to the raw pipe, or rubbing the raw pipe with a material such as a brush or rag in a layer filled with cleaning liquid. has been done. However, when this method is used, the surface of the raw pipe is damaged by rubbing, and under poor conditions, the surface is scraped and new powder from the raw pipe adheres, resulting in secondary surface contamination. This had an adverse effect on the image characteristics of the photoreceptor.

Therefore, an object of the present invention is to provide a cutting oil that can be completely cleaned and removed even by a non-contact cleaning method, and a method of cutting a base material for an electrophotographic photoreceptor using the cutting oil. .

[Means to solve the problem]

As a result of intensive studies to achieve the above object, the present inventors found that the degree of cleaning of the raw pipe in the non-contact cleaning method depends on the type of cutting oil, and that if a specific cutting oil is used when cutting the raw pipe,
The present invention was achieved by discovering that non-contact cleaning such as ultrasonic cleaning and steam cleaning does not cause insufficient cleaning.

That is, the present invention contains 1.0% by weight or more of a component having a number average molecular weight of 500 or more and a kinematic viscosity of 4.0cs.
t or less.

The present invention also relates to a method for cutting a substrate material for an electrophotographic photoreceptor, which comprises cutting the substrate material for an electrophotographic photoreceptor using the above cutting oil.

The cutting oil, the method for cutting a raw tube, and the electrophotographic photoreceptor according to the present invention will be described in detail below.

First, the cutting oil according to the present invention may be either one kind or a blend of two or more kinds of oils. In either case, the cutting oil of the present invention needs to contain 1.0% by weight or more of a component having a number average molecular weight of 500 or more and have a kinematic viscosity of 4.0 cst or less.

If the content of components with a number average molecular weight of 500 or more is less than 1.0% by weight, the cutting oil on the object to be cut tends to dry quickly, and the chips generated during cutting and the process from cutting to washing tend to be Dust adhering to the surface of the object to be cut cannot be completely removed and remains on the surface, resulting in poor cleaning.

If the kinematic viscosity exceeds 4.0 cst, scratches (chatter) will occur on the object to be cut during cutting, and dust will firmly adhere to and remain on the surface during storage, resulting in poor cleaning.

In the present invention, the number average molecular weight is determined by Hitachi gel permeation chromatography (hereinafter abbreviated as GPC), and the kinematic viscosity is determined using a Cannon-Fenske (So type) viscometer at 28°C. It is what is required.

Specific examples of cutting oils of the present invention that satisfy the above conditions include mixtures of polybutene and aliphatic hydrocarbons, kerosene, or light oil.

The cutting oil of the present invention can be easily removed by non-contact cleaning methods such as ultrasonic cleaning and steam cleaning, so it can be applied to materials whose surfaces should not be damaged by contact cleaning, such as substrate materials for electrophotographic photoreceptors. Suitable for cutting.

Next, a method for cutting a substrate material for an electrophotographic photoreceptor using the cutting oil of the present invention will be described.

The material of this base material may be aluminum, iron, copper, other metals, and their alloys, but the weight, price,
From the viewpoint of workability, aluminum and its alloys are generally used. The base material is made into a cylindrical tube by impact molding, extrusion, drawing, etc., and then the surface is roughened by 0.1 to 1.5 mm by cutting, etc. Finished to O8. At this time, by using the cutting oil of the present invention, the surface can be easily cleaned by a non-contact cleaning method when an electrophotographic photoreceptor is subsequently manufactured using the blank tube.

After cleaning the cut raw pipe in this manner, a photosensitive layer can be provided on the surface of the raw pipe.

In the present invention, the photosensitive layer basically separates the functions of charge generation and transport, and includes a composite photoconductive layer having a charge generation layer and a charge transport layer, and a single-layer conductive layer without such functional separation. It is.

First, the composite photoconductive layer will be explained.

The charge generation layer contains an organic pigment that generates charges.

As the organic pigment, a charge-generating pigment such as azoxybenzene type, disazo type, trisazo type, benzimidazole type, polycyclic quinoline type, indigoid type, quinacridone type, phthalocyanine type, perylene type, methine type, etc. is used. can.

These pigments are disclosed in, for example, JP-A Nos. 47-37544, 47-18543, 47-18544, and 41-
No. 43942, No. 4L-7051, No. 49-1231
No. 49-105536, No. 50-75214,
It is disclosed in Japanese Patent Publication No. 50-92738. In particular, the
and η'-type gold metal phthalocyanine, which has high sensitivity even to long wavelengths and is also effective as an electrophotographic photoreceptor for printers equipped with diode lasers. In addition to these, any organic pigment that generates charge carriers upon irradiation with light can be used.

Further, the charge generation layer may contain, if necessary, additives such as a binder and/or plasticizer, a fluidity imparting agent, and a pinhole inhibitor that are commonly used in electrophotographic photoreceptors.

As a binder, silicone resin, polyamide resin, polyurethane resin, polyester resin, epoxy resin, polyketone resin, polycarbonate resin, polystyrene resin, polymethyl methacrylate resin, polyacrylamide resin, polybutadiene resin, polyisoprene resin, melamine resin, benzoguanamine resin, ethyl cellulose resin, nitrocellulose resin, polychloroprene resin, vinyl acetate resin, polyacrylonitrile resin, urea resin, and the like. It is also possible to use heat and/or photocurable resins. In any case, there is no particular restriction as long as the resin is electrically insulating and can form a film under normal conditions.

The amount of the resin binder in the charge generation layer is preferably 5 to 200 parts by weight, more preferably 10 to 100 parts by weight, based on 100 parts by weight of the organic pigment that generates charges. If it is less than 5 parts by weight, the adhesion will be poor and the charge generation layer film will tend to be non-uniform (and the image quality will tend to be poor.200
If it exceeds 1 part by weight, the sensitivity will decrease and the residual potential will tend to become high.

Examples of the plasticizer include halogenated paraffin, dimethylnaphthalene, and dibutyl phthalate. Examples of fluidity imparting agents include Modaflow (manufactured by Monsando Chemical Co.) and Acronal 4F (manufactured by Basf Co., Ltd.).
Examples of pinhole suppressants include benzoin and dimethyl phthalate. Each of these is preferably used in an amount of 5% by weight or less based on the charge-generating organic pigment.

A method for forming a charge generation layer is to apply a solution of a uniform mixture of charge-generating organic pigments, resin binders, curing agents, additives, etc. in a solvent to a conductive substrate (if there is an undercoat layer, layer) using a coating method such as a dip coating method, a spray coating method, a roll coating method, an applicator coating method, a wire bar coating method, etc., and drying.

In this case, the solvents used include acetone, methyl ethyl ketone, methyl isobutyl ketone, tetrahydrofuran, toluene, ethyl acetate, cellosolve, xylene, methanol, methylene chloride, 1.1.2-)lichloroethane, isopropyl alcohol, isobutyl alcohol,
Solvents include n-butyl alcohol and trichloroethane.

The thickness of the charge generation layer is usually 0.001 to 10 μm, preferably 0.1 to 5 μm. If the thickness is less than 0,001 μm, it becomes difficult to uniformly form the charge generation layer, and if it exceeds 10 μm, the electrophotographic properties tend to deteriorate.

The charge transport material used in the charge transport layer includes fluorene, fluorenone, 2,7-dinitro-9 fluorenone,
4H-indeno(1,2,6)thiophen-4-one,
3,7-sinitrodibenzothiophene-5-oxide, 1-bromopyrene, 2-phenylpyrene, carbazole, 3-phenylcarbazole, 2-phenylindole, 2-phenylnaphthalene, oxazole, oxadiazole, oxatriazole, tri phenylamine,
imidazole, chrysene, tetrafen, acridine,
Various hydrazones, styryl compounds, poly-N-vinylcarbazole, halogenated poly-N-vinylcarbazole, 1-phenyl-3(4-diethylaminostyryl)-
5-(4-diethylaminophenyl)pyrazoline, polyvinylpyrene, 2-phenyl-4-(4-diethylaminophenyl)-5-phenyloxazole, polyvinylindoquinoxaline, 1,1-bis(pdiethylaminophenyl)-4,4 Examples include -diphenyl-1,3-butadiene, polyvinylbenzothiophene, polyvinylanthracene, polyvinylacridine, polyvinylpyrazoline, and derivatives thereof.

The resin binder that is the binder for the charge transport layer includes silicone resin, polyamide resin, polyurethane resin, polyester resin, epoxy resin, polycarbonate resin, polystyrene resin, polymethyl methacrylate resin, polyacrylamide resin, polybutadiene resin, and polyisoprene resin. , phenolic resin, melamine resin, ethyl cellulose resin, nitrocellulose resin, polyvinyl alcohol resin, polyvinyl formal resin, polychloroprene resin, polyvinyl butyral resin, alkyl vinyl-fluorine copolymer, cycloalkyl vinyl-fluorine copolymer, vinyl acetate resin , polyacrylonitrile resin, urea resin, acrylonitrile-styrene copolymer, maleic anhydride-styrene copolymer, ethylene-vinyl acetate copolymer, vinyl chloride-vinyl acetate copolymer, and blends thereof. It is also possible to use heat and/or photocurable resins. In any case, there are no particular limitations as long as the resin is electrically insulating and can form a film under normal conditions. These resin binders are preferably used in an amount of 400 parts by weight or less based on 100 parts by weight of the charge transport material so as not to deteriorate the electrophotographic properties.
For low-molecular charge transport substances, 50% is recommended due to film characteristics.
Parts by weight or more are preferred.

Further, the same additives as those in the charge generation layer, such as a plasticizer, a fluidity imparting agent, and a pinhole inhibitor, can be used in the charge transport layer as necessary.

Each additive is preferably used in an amount of 5 parts by weight or less based on the charge transport material.

To form the charge transport layer, the charge transport material, binder, and additives are uniformly dissolved in the same solvent used to create the charge generation layer, and then this solution is applied onto the charge generation layer by dip coating. , a spray coating method, a roll coating method, an applicator coating method, a wire bar coating method, or the like, and can be formed by coating and drying.

The thickness of the charge transport layer is 5 to 50 μm, preferably 8 to 30 μm.
It is μm. Below 5 μm, the initial potential is low (becomes 5 μm).
If it exceeds 0 μm, sensitivity tends to decrease.

The composite photoconductive layer may be one in which a charge generation layer and a charge transport layer are sequentially laminated, or conversely, a charge transport layer and a charge generation layer may be one in which a charge transport layer and a charge generation layer are laminated in sequence. Alternatively, it may have a sandwich structure in which a charge generation layer is sandwiched between two charge transport layers.

Next, the -layer type photoconductive layer will be explained.

- The layered photoconductive layer contains a charge generating material and a charge transporting substance. The charge-generating material can be the organic pigment used in the charge-generating layer, and the charge-transporting substance can be the charge-transporting substance used in the charge-transporting layer.

In addition to this, the single-layer photoconductive layer contains binders and plasticizers, fluidity imparting agents, pinhole inhibitors, etc. similar to those used in the charge generation layer and charge transport layer of the composite photoconductive layer. Additives may be included. Among these, the role of binders is important.

In the single-layer photoconductive layer, the binder is the charge transporting substance 1
It is preferable to use 80 to 450 parts by weight, particularly preferably 100 to 300 parts by weight.

If the amount of the binder is too small, the charging property will be poor, and if it is too large, the sensitivity will tend to decrease. In this case, the charge generating material is preferably 0.1 to 20% by weight, particularly preferably 0.5 to 5% by weight, based on the total amount of the charge transporting substance and the binder.
% by weight used. If the amount of the charge generating material is too small, the sensitivity tends to decrease, and if it is too large, the charging property tends to be poor. In addition, additives such as plasticizers, fluidity imparting agents, and pinhole inhibitors are appropriately selected and used in the -layer type photoconductive layer in an amount of 5% by weight or less. -The thickness of the layered photoconductive layer is 5 to 50 μm
It is preferable that it is, and it is especially preferable that it is 8-20 micrometers. If it is less than 5 μm, the charging property tends to be poor, and the
If it exceeds μm, sensitivity tends to decrease.

- To form the layered photoconductive layer, the charge generating material, charge transporting substance, binder and optional additives are uniformly dissolved or dispersed in the same solvent as for the charge generating layer described above. Afterwards, apply and dry.

The photosensitive layer of the present invention is a multilayer photoconductive layer in which the same charge transport layer as the charge transport layer in the composite photoconductive layer is formed immediately above, immediately below, or both of the above-mentioned multilayer photoconductive layer. layers can be employed.

The electrophotographic photoreceptor according to the present invention may have a thin adhesive layer or barrier layer between the conductive layer and the photosensitive layer and immediately above the conductive layer. Further, a protective layer may be provided on the surface.

〔Example〕

Next, the present invention will be explained in detail with reference to Examples, but the present invention is not limited thereto.

Raw tube (aluminum drum) used in Examples and Comparative Examples
The dimensions are: outer diameter 120 mm, pipe length 373 mm, thickness 4 mm.
It is.

First, each material used in the following examples is listed.

In addition, abbreviations are shown in parentheses.

(1) Charge-generating organic pigment τ-type metal-free phthalocyanine (τ-H2Pc) (2) Charge-transporting substance 1.1-bis(p-diethylaminophenyl) 4.4-
Diphenyl-1,3-butadiene (PBD) (3) Binder (A) Binder for undershoes Polyamide resin: M1276 (M1276) Solid content 1
Melamine resin: Melan 2000 (ML2000) Solid content 50% by weight (manufactured by Hitachi Chemical) (B) Binder for charge generation layer Bisphenol-modified polyester resin: Vylon 290
(V290), solid content 100% by weight (manufactured by Toyobo ■) Alkyl etherified benzoguanamine resin = ML366
L (ML366L) Solid content 60% by weight (8 Ritsukasei Kogyo ■ i!ri (C) Binder for charge transport layer Polycarbonate resin Newpilon S-2000 (U
S2000), solid content 100% by weight (manufactured by Mitsubishi Gas Chemical Co., Ltd.) Comparative Example 1 An extruded tube (mandrel tube) aluminum drum made of JIS A3003 alloy manufactured by Showa Aluminum was used, and the component with a number average molecular weight of 500 or more was 0% by weight. , kinematic viscosity is 1
．． Mirror finishing (0, IS) was carried out using an ultra-precision lathe made by Maren using kerosene having a viscosity of 6 cst. After that, it was allowed to stand for 58 hours, and then subjected to ultrasonic cleaning in methylene chloride.

Next, 105 g of M1276, 210 g of ML2000 and 6,3 g of trimellitic acid were mixed in a mixed solvent of methanol and 1,2-dichloroethane in a ratio of 1:1 (weight ratio) 4000.
completely dissolved in g. This solution was applied onto the above-mentioned raw pipe by dip coating, and dried at 140°C for 60 minutes to form an undercoat layer with a thickness of 0.3 μm.

Next, 150 g (Dr-H2PO, 180 g) V2
O3, 75g ML366L and tetrahydrofuran 1
200 g of the mixed solution was kneaded for 8 hours using a ball mill. The resulting dispersion was diluted with tetrahydrofuran to adjust the solid content to 4.0% by weight. This dispersion was coated on the undercoat layer by dip coating and heated to 60°C at 140°C.
It was dried for a minute to form a charge generation layer with a thickness of 0.5 μm.

Next, 125 g of PBD and 375 g of US2000 were mixed with methylene chloride 1. 1. 2-trichloroethane 1
:1 (weight ratio) of a mixed solvent of 3000 g. This solution was applied onto the charge generation layer having the undercoat layer by dip coating, and dried at 120°C for 60 minutes to form a charge transport layer having a thickness of 18 μm.

Comparative Example 2 An extruded tube (mandrel tube) aluminum drum made of JIS A6063 alloy manufactured by Showa Aluminum ■ had a component with a number average molecular weight of 500 or more at 22% by weight and a kinematic viscosity of 43. Mirror finishing (0, I
S) I did. After that, it was left to stand for 5 days, and then subjected to ultrasonic cleaning in methylene chloride. Next, an electrophotographic photoreceptor was manufactured using the same operating method as in Comparative Example 1.

Comparative Example 3 An extruded tube (mandrel tube) aluminum drum made of high-purity aluminum (aluminum content of 99.99% by weight or more) manufactured by Showa Aluminum ■ has a component with a number average molecular weight of 500 or more at 0.6% by weight, and has a kinematic viscosity of 0.6% by weight. is 2.1 cs
Mirror finishing (0, IS) was performed using a 1:4 (weight ratio) mixed oil of polybutene LV-10 (Japan Petroleum Department) and kerosene, which was t, on an ultra-precision lathe manufactured by Uma Ren. After leaving it for 5 days, it was subjected to ultrasonic cleaning in methylene chloride. next,
An electrophotographic photoreceptor was manufactured using the same operating method as in Comparative Example 1.

Comparative Example 4 An extruded tube (mandrel tube) aluminum drum made of Showa Aluminum ■ and made of JIS A6063 alloy was made of polybutene LV-, which contains 1.9% by weight of components with a number average molecular weight of 500 or more and has a kinematic viscosity of 4.6 cst. 10 (manufactured by Nippon Oil Corporation) and 1 of aliphatic hydrocarbon DIIO (manufactured by ethane)
Using a mixed oil of =1 (weight ratio), mirror finishing (0, IS) was performed using an ultra-precision lathe manufactured by Maren. After leaving it for 5 days,
Ultrasonic cleaning was performed in methylene chloride. Next, Comparative Example 1
An electrophotographic photoreceptor was manufactured using the same operating method.

Comparative Example 5 An extruded tube (mandrel tube) aluminum drum made of JIS A3003 alloy manufactured by Showa Aluminum was replaced with JENREX57 (made by Mopil), which contains 0.1% by weight of components with a number average molecular weight of 500 or more and has a kinematic viscosity of 5.6 cst. ) was used for mirror finishing (0, IS) using an ultra-precision lathe manufactured by Umaren. After that, it was left to stand for 5 days, and then subjected to ultrasonic cleaning in methylene chloride. Next, an electrophotographic photoreceptor was manufactured using the same operating method as in Comparative Example 1.

Example 1 An extruded tube (mandrel tube) aluminum drum made of Showa Aluminum ■ and made of JIS A6063 alloy was made of polybutene LV-, which contains 2.6% by weight of components with a number average molecular weight of 500 or more and has a kinematic viscosity of 2.7 cst. Using a mixture of 5 (Japan Petroleum Department) and kerosene in a weight ratio of 1:1 (weight ratio), mirror finishing (0, IS) was performed using an ultra-precision lathe manufactured by Umaren. After that, it was left to stand for 5 days, and then subjected to ultrasonic cleaning in methylene chloride.

Next, an electrophotographic photoreceptor was manufactured using the same operating method as in Comparative Example 1.

Example 2 An extruded tube (mandrel tube) aluminum drum made of high-purity aluminum (aluminum content of 99.99% by weight or more) manufactured by Showa Aluminum
0 or more components are 1.2% by weight, and the kinematic viscosity is 2.5
Cst, polybutene LV-10 (manufactured by Nippon Oil Co., Ltd.) and light oil in a 1=1 (weight ratio) mixed oil was used for mirror finishing (0, IS) using an ultra-precision lathe manufactured by Shōun. After leaving it for 5 days, it was subjected to ultrasonic cleaning in methylene chloride. Next, an electrophotographic photoreceptor was manufactured using the same operating method as in Comparative Example 1.

Example 3 An extruded tube (mandrel tube) aluminum drum made of JIS A3003 alloy manufactured by Showa Aluminum ■ was prepared using polybutene LV-5 (mandrel tube) containing 2.9% by weight of components having a number average molecular weight of 500 or more and having a kinematic viscosity of &3 cst. 7:3 of Nippon Oil ■) and aliphatic hydrocarbon D110 (manufactured by Etasso)
Using a mixed solution of (weight ratio), mirror finishing (0, IS) was carried out using an ultra-precision lathe made by Shōun. After that, it was left to stand for 5 days, and then subjected to ultrasonic cleaning in methylene chloride. Next, an electrophotographic photoreceptor was manufactured using the same operating method as in Comparative Example 1.

The electrophotographic photoreceptors obtained in Examples 1 to 3 and Comparative Examples 1 to 5 were evaluated using an image evaluation machine (negative charging, reversal development method).
A printing test was conducted at 20° C. and 30% relative humidity to evaluate the image. The results are shown in Table 1. Furthermore, if chatter occurs in the cutting tool when cutting the raw tube, defects such as color unevenness will appear in the chattered area when a charge generation layer is applied. Table 1 also shows the results of visual observation of color unevenness in the charge generation layer.

Table 1 Results of Printing Test As is clear from the above results, the photoreceptors of Examples 1 to 3 did not show any dark spots or fog, and there was no color unevenness. However, in the photoreceptors of Comparative Examples 1 to 5, color unevenness occurred, as well as black spots and fog.

〔Effect of the invention〕

If the substrate material for an electrophotographic photoreceptor is cut using the cutting oil of the present invention, there will be no cutting scratches on the surface, and dirt can be reliably removed using only a non-contact cleaning method, which is not possible with a contact cleaning method. It is possible to prevent the inevitable secondary contamination caused by cleaning, and to easily produce a high-quality electrophotographic photoreceptor without image defects such as black spots and fog.

Claims (1)

[Scope of Claims] 1. A cutting oil characterized by containing 1% by weight or more of a component having a number average molecular weight of 500 or more and having a kinematic viscosity of 4.0 cst or less. 2. A method for cutting a substrate material for an electrophotographic photoreceptor, which comprises cutting a conductive substrate for an electrophotographic photoreceptor using the cutting oil according to claim 1.