JP3068251B2 - Base for electrophotographic lithographic printing plate precursor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base material for an electrophotographic lithographic printing plate precursor having low plate elongation during printing and excellent printing durability.

[0002]

2. Description of the Related Art In general, an electrophotographic lithographic printing plate precursor is constituted by providing a layer containing an inorganic or organic optical semiconductor on a substrate having characteristics such as conductivity and water resistance. Is a sheet-like substance such as paper, metal foil, film, or a composite thereof.If paper is used, the paper is subjected to a water-resistant treatment and a conductive substance is used to improve the electrophotographic image. Is added.

However, when a lithographic printing original plate is prepared using such a treated paper as a base material, plate elongation cannot be avoided even when a water-resistant treatment is applied due to the application of dampening water during printing. . For this reason, wrinkles occur on the printing plate during printing, misregistration of the printed matter, and errors in the dimensions of the ruled lines occur.

If instead of paper, paper in which metal foil such as aluminum, zinc, copper or the like is bonded by an adhesive (hereinafter referred to as metal foil laminated paper), elongation and tensile strength when wet can be improved. And a printing plate having good dimensional stability can be obtained.
No.-17249, No.41-2426, No.41-124
No. 32 publication).

[0005] Usually, a metal foil laminated paper is produced by bonding one or both sides of a metal foil to paper with an adhesive, and the adhesive between the metal foil and the paper is widely used industrially. For example, a vinyl acetate resin, an acrylic resin, a polyolefin resin, a polyurethane resin, or the like is used. These are applied as a water-based paint in the form of an emulsion, or as a solvent-based paint by selecting an appropriate solvent, and are laminated between metal foil and paper. In addition, a water-soluble resin such as casein, poval, starch or the like may be used as the adhesive. In addition, as a lamination method, a hot melt method using a resin that is melted by heating, such as a wax resin, a polyolefin resin (polyethylene, polypropylene, ethylene-vinyl acetate copolymer resin, ionomer, etc.), an extrusion coating method, and the like. Well used.

The present inventors have manufactured an electrophotographic lithographic printing plate precursor using a metal foil laminated paper as a base material and examined the practicability thereof. Physical properties were found to be the following three points.

(1) No blister (destruction between layers, also called blistering) is caused by insufficient bonding strength between the metal foil and the base paper and the strength of the internal bonding of the base paper during thermal fixing of the toner during plate making.

(2) At the time of printing, immersion water penetrating from the end face of the printing plate reduces the adhesive strength between the metal foil and the base paper and the internal bonding strength of the base paper. That does not occur.

(3) At the time of plate making, especially under low humidity conditions,
Fogging (a phenomenon in which toner adheres to non-image areas) due to a decrease in conductivity due to a decrease in water content does not occur.

If an acrylic resin emulsion and a synthetic rubber resin, or a mixture of a synthetic resin aqueous emulsion and casein in a fixed ratio is used as the adhesive between the metal foil and the base paper, the adhesive strength between the metal foil and the base paper is improved. It has already been reported that the above points (1) and (2) can be improved to some extent (JP-A-58-16892 and 58-1).
No. 7449). Also, by adding chemicals such as a wet strength agent to the base paper to improve the internal bonding strength of the base paper,
Improvements in the points (1) and (2) have also been made. Regarding point (3), when plate making is performed under low humidity conditions, the moisture content of the base material is reduced and the conductivity is reduced, and the charge remains in the non-image portion where the charge should be lost by exposure. Therefore, it is known that fogging is likely to occur. Using a water-soluble resin for the adhesive between the metal foil and the base paper,
Fogging can be suppressed to some extent by imparting water retention to the adhesive layer to increase conductivity, but delamination between the metal foil and base paper due to blisters during plate making and dampening water during printing is likely to occur. Become. As described above, the conventional technology cannot completely prevent the occurrence of blisters during plate making, delamination between metal foil and base paper due to dampening solution during printing, and fogging during plate making under low humidity conditions. there were.

[0011]

SUMMARY OF THE INVENTION The present invention relates to blisters at the time of plate making, delamination between metal foil and base paper due to dampening solution at the time of printing, and plate making under low humidity conditions, which could not be realized by such prior art. It is an object of the present invention to provide a base material for an electrophotographic lithographic printing plate precursor having good printing durability and excellent electrophotographic properties without fogging or the like.

[0012]

The inventors of the present invention have studied the relationship between the characteristics of the base paper bonded to the metal foil and the fogging during plate making. As a result, the conductivity and low humidity of the surface of the base paper bonded to the metal foil have been studied. It became clear that there is a close relationship with fogging when plate making under the conditions. In other words, when an electrophotographic lithographic printing original plate is prepared using a base material having a high surface resistance value laminated with a metal foil as a base material, the conductivity of the base material is significantly reduced under low humidity conditions, and fogging during plate making. Although it occurs, when the electrophotographic lithographic printing original plate is manufactured using a base paper obtained by laminating a base paper having a low surface resistance value with a metal foil, the conductivity of the base material is less reduced even under low humidity conditions, and fogging during plate making is performed. Turned out not to occur. Therefore, by providing a coating layer containing a conductive substance on the base paper surface to keep the surface resistance low and laminating it with metal foil, electrophotographic properties and printing durability that do not cause fogging even when plate making is performed under low humidity conditions It has been found that a good base material for electrophotographic lithographic printing plate precursor can be obtained, and the present invention has been achieved.

In the present invention, the base paper having a low surface resistance is defined as a base paper having a surface resistance of 15 ° C. and 10% R
H indicates a layer provided with a coating layer having a volume resistance of 1.0 × 10 ¹² Ωcm or less under the condition of H, but the volume resistance of the coating layer exceeds 1.0 × 10 ¹² Ωcm. If it is high, fogging is inevitable when plate making is performed under low humidity conditions.

In the present invention, the coating layer having a volume resistivity of 1.0 × 10 ¹² Ωcm or less under the conditions of 15 ° C. and 10% RH, which is provided on the surface of the base paper to be bonded to the metal foil, is mainly water-soluble. It is desirable to use an adhesive such as a resin or a synthetic resin emulsion and a conductive material. For this purpose, as the water-soluble resin or synthetic resin emulsion used, starch and its derivatives, cellulose and its derivatives, polyvinyl alcohol, styrene-butadiene-based latex, acrylic-based resin emulsion, vinyl acetate-based resin emulsion and the like are preferable.

[0015] Examples of the conductive substance include inorganic electrolytes such as sodium chloride, potassium chloride and calcium chloride;
Conductive resins such as polyvinylbenzyl-type quaternary ammonium salt, polyacrylic acid-type quaternary ammonium salt, sodium polystyrenesulfonate, sodium polyacrylate, polyoxyethylene alkylamine, polyoxyethylene alkylamide, polyoxyethylene alkyl Nonionic surfactants such as ethers, polyoxyethylene alkylphenyl ethers, glycerin fatty acid esters, sorbitan fatty acid esters, and anionic surfactants such as alkyl sulfonate sodium salt, alkylbenzene sulfonate sodium salt, alkyl sulfate sodium salt, and alkyl phosphate sodium salt Agents, cationic surfactants such as alkyl quaternary ammonium salts, amphoteric surfactants such as alkyl betaine type, alkyl imidazoline type and alkyl alanine type. It can be used.

Further, a pigment, a crosslinking agent, a sizing agent and the like may be added to the coating layer, if necessary, in order to improve the barrier property against water and organic solvents.

In the present invention, if the coating amount of the coating layer is too small, it is difficult to uniformly coat the base paper surface. Therefore, the drying coating amount is preferably 0.5 g / m ² or more. The upper limit of the coating amount is naturally restricted by the surface properties of the paper or the economics.

In the present invention, the coating layer is applied to the surface of the base paper by a size press, a gate roll coater, a reverse roll coater, a gravure coater, a rod coater, a die coater, a curtain coater, a blade coater or the like. In consideration of this, a size press device or a gate roll coater suitable for on-machine coating is preferable.

In the present invention, in order to enhance the adhesion between the metal foil and the base paper, the surface of the base paper is provided with a coating layer, and the surface of the base paper is smoothed by a machine calender, a super calender, a gloss calender, a soft nip roll calender, a Yankee dryer or the like. Is preferred.

The metal foil used in the present invention prevents elongation and a decrease in tensile strength when a conductive layer necessary for forming an image by an electrophotographic method and a fountain solution during printing soak into a base paper layer. If it has a dual role as a support layer and the metal is thinned to meet this purpose,
The material may be anything. For example, a single composition of iron, copper, tin, aluminum, lead, zinc, or the like, or an alloy thereof. Among them, aluminum is preferred as the material to be laminated on the base paper because of its low specific gravity, light weight, good spreadability, and easy processing into foil, but of course, the present invention is not limited to this. It is not something to be done.

In the present invention, the bonding between the metal foil and the base paper is as follows.
The dry lamination method is preferable to the glue lamination method because the water resistance and the heat resistance are remarkably excellent. In general, in the dry lamination method, heating aging is performed to speed up the rise of adhesion. At this time, oxidation of the metal foil surface and adhesion of organic substances occur, and an intermediate layer is formed between the base material and the image receiving layer. When a layer is provided, the adhesiveness of the metal foil-intermediate layer is reduced, or when the base paper is laminated on both sides of the metal foil, the metal foil-
It is preferable to use a room temperature-curable adhesive which does not require heating aging because the adhesiveness between base papers is reduced.

For applying the adhesive, a gravure coater, a roll coater, a rod coater, a die coater, a curtain coater, a blade coater and the like can be used. Is preferred.

The surface to which the adhesive is applied may be either a metal foil or a base paper. When the metal foil is thin, it is necessary to prevent the metal foil from wrinkling due to shrinkage of the adhesive during drying. Preferably, an adhesive is applied to the base paper surface.

When the amount of the adhesive applied is extremely small, sufficient adhesion between the metal foil and the base paper cannot be obtained. In particular, when one side to be laminated is paper, it has at least 1 g /
A coating amount of m ² or more is required. If the coating amount is less than this, the coating of the coated surface with the adhesive becomes insufficient, and the bonding strength between the metal foil and the base paper is partially reduced. Then, if the sheet is heated at the time of plate making, it cannot withstand the generation of water vapor and air expansion from within the base paper layer, and blisters are generated between the metal foil and the base paper. The upper limit of the coating amount is naturally limited by the performance of the laminator, the surface properties of the base paper, or the economy, but is practically preferably in the range of 1 to 10 g / m ² .

In the present invention, the intermediate layer usually contains a synthetic resin emulsion, if necessary, of clay, sericite,
It is applied by mixing with a pigment such as calcium carbonate, a water-soluble resin such as starch or polyvinyl alcohol, a conductive agent, a crosslinking agent, and the like.

In the present invention, the image receiving layer refers to an image formed by an electrophotographic method, and contains an optical semiconductor as its basic component. Usually zinc oxide,
An inorganic optical semiconductor such as titanium dioxide or cadmium sulfide dispersed in an insulating adhesive resin, or an organic optical semiconductor such as polyvinyl carbazole is used.

In the present invention, in order to enhance the water resistance and conductivity of the substrate, a backing layer may be provided on the side of the substrate opposite to the image-receiving layer. The resin emulsion is applied, if necessary, by mixing it with a pigment such as clay, sericite, calcium carbonate, a water-soluble resin such as starch or polyvinyl alcohol, a conductive agent, a crosslinking agent and the like.

[0028]

In the present invention, when a metal foil laminated paper obtained by laminating a base paper having a low surface resistance value with a metal foil is used as a base material, the conductivity of the base material is less reduced even under low humidity conditions, and fogging occurs during plate making. An electrophotographic lithographic printing plate precursor having excellent electrophotographic characteristics is obtained.

[0029]

Next, the present invention will be described in more detail by way of examples. The parts and percentages shown below are based on weight.

Example 1 (1) Preparation of low volume resistance coating solution and measurement of volume resistance value A coating solution having the following composition was prepared, and the dry coating amount was 5.0 g / m ² on an aluminum foil having a thickness of 50 μm. It was 7.8 × 10 ⁸ Ωcm when the volume resistance was measured using a 16008A type resistive cell manufactured by Hewlett-Packard at 20 ° C. and 65% RH after air-drying. (Composition 1) Oxidized starch (5% aqueous solution): 99 parts Styrene resin sizing agent (Polymalon 385, manufactured by Arakawa Chemical Industries, solid content 25%): 0.5 parts Sodium chloride: 0.5 parts

(2) Preparation of an electrophotographic lithographic printing original plate A coating solution of composition 1 was applied to a high quality paper having a basis weight of 100 g / m ² by a size press so that a dry coating amount was 2.1 g / m ² . After drying, it was smoothed using a machine calender. An adhesive for dry lamination having the following composition was applied to this base paper so that the dry coating amount was 3.0 g / m ^2, and an aluminum foil having a thickness of 10 μm was laminated. This aluminum foil laminated paper was left at room temperature for 2 days to perform aging at room temperature. Polyester polyol resin (BLS-PC21, manufactured by Toyo Morton, solid content 35%): 15 parts Polyisocyanate (CAT-100, manufactured by Toyo Morton, solid content 50%): 1 part Ethyl acetate: 3 parts

Next, on the aluminum foil side of the aluminum foil laminated paper, an intermediate layer having the following composition was applied in a dry coating amount of 10 g / m ^2.
And dried. Sericite-containing inorganic pigment (Sigleite TMC, manufactured by Sigleite Chemical, 50% aqueous dispersion): 100 parts Carboxyl-modified SBR latex (solid content: 48%):
100 parts oxidized starch (solid content 25%): 20 parts melamine resin precondensate (Smirates Resin-613,
Sumitomo Chemical, solid content 80%): 4 parts organic amine salt catalyst (Sumitex Accelerator A)
CX-P, manufactured by Sumitomo Chemical, solid content 35%): 0.4 part

On the opposite side of the intermediate layer of the above-mentioned aluminum foil laminated paper, a back coat having the following composition was applied in a dry coating amount of 15 g / m 2.
^It was applied so as to be ² and dried. Kaolin (Hydrasperse, manufactured by Huber, 50% aqueous dispersion): 100 parts Sericite-containing inorganic pigment (Sigleite TMC, manufactured by Sigleite Chemical, 50% aqueous dispersion): 100 parts Oxidized starch (25% aqueous solution): 60 Part carboxyl-modified SBR latex (solid content 48%):
150 parts ammonium polystyrene sulfonate (solid content 30
%): 6 parts melamine resin precondensate (Smirates resin-613,
Sumitomo Chemical, solid content 80%): 4 parts

Further, a dry coating amount of 20 g is applied to the surface of the intermediate layer.
/ M ² , a photoconductive layer having the following composition was applied and dried. Zinc oxide for electrophotography: 200 parts Acrylic resin (50% solution): 80 parts Rose bengal (2% methanol solution): 15 parts Xylene: 250 parts

This electrophotographic lithographic printing plate was heated at 15 ° C.
Seasoning was performed under low humidity conditions of 0% RH, and plate making was performed using an electrophotographic plate making machine Diafax EP-31V (manufactured by Mitsubishi Paper Mills, plate making machine for liquid development).

Next, desensitizing treatment was carried out with an etchant for an electrophotographic offset master, Diafax LOM-OHII (manufactured by Mitsubishi Paper Mills), and an offset printing machine Toko Model was used.
810 (manufactured by Tokyo Aviation Instruments).

No fogging or blistering occurred, and a clear image with high sensitivity was obtained even when plate making was performed under low humidity conditions of 15 ° C. and 10% RH. Even after the etchant treatment, no curl or the like is generated, and it can be mounted on a printing machine by a smooth operation. In printing with dampening solution, even if printing is performed for 10,000 sheets or more, plate elongation, aluminum foil- It was confirmed that the printing plate obtained according to the present invention was extremely excellent, without occurrence of delamination between the base papers and delamination of the photosensitive layer.

Example 2 (1) Preparation of Low Volume Resistance Coating Liquid and Measurement of Volume Resistance Value A coating liquid having the following composition was prepared and the dry coating amount was 5.0 g / m ² on an aluminum foil having a thickness of 50 μm. It was 6.9 × 10 ¹¹ Ωcm when the volume resistance was measured using a 16008A type resistivity cell manufactured by Hewlett-Packard at 20 ° C. and 65% RH after air-drying. (Composition 2) Oxidized starch (5% aqueous solution): 99 parts Styrene resin sizing agent (Polymalon 385, manufactured by Arakawa Chemical Industries, solid content 25%): 0.5 parts Sodium polystyrene sulfonate (solid content 30%):
0.5 parts

(2) Preparation of an electrophotographic lithographic printing original plate A coating solution of composition 2 was applied to a high quality paper having a basis weight of 50 g / m ² by a size press so that the dry coating amount was 1.8 g / m ² . After drying, it was smoothed using a machine calender. Example 1 on one side of a 10 μm thick aluminum foil
The dry application amount of the adhesive for dry lamination is 3.0 g /
m ² and laminated with this base paper.
After leaving this aluminum foil laminated paper at room temperature for 2 days to perform room temperature aging, the dry laminating adhesive of Example 1 was applied to the other aluminum foil surface in an amount of 3.0 g.
/ M ² and laminated again with this base paper. This aluminum foil laminated paper was left at room temperature for 2 days to perform aging at room temperature.

Next, an intermediate layer having the following composition was applied on one side of the aluminum foil laminated paper so as to have a dry coating amount of 15 g / m ² and dried. Sericite-containing inorganic pigment (Sigleite TMC, manufactured by Sigleite Chemical, 50% aqueous dispersion): 100 parts Carboxyl-modified SBR latex (solid content: 48%):
50 parts melamine resin precondensate (Smirates resin-613,
Sumitomo Chemical, solid content 80%): 4 parts organic amine salt catalyst (Sumitex Accelerator A)
CX-P, manufactured by Sumitomo Chemical, solid content 35%): 0.4 part ammonium polystyrenesulfonate (solid content 30)
%): 4 copies

On the side opposite to the intermediate layer of this aluminum foil laminated paper, the back coat layer of Example 1 was dried at a coating weight of 15 g /
m ² and dried.

Further, the dry coating amount on the surface of the intermediate layer is 20 g.
/ M ² , the photoconductive layer of Example 1 was applied and dried to prepare a printing plate.

Example 3 (1) Preparation of Low Volume Resistance Coating Liquid and Measurement of Volume Resistance Value A coating liquid having the following composition was prepared, and the dry coating amount was 5.0 g / m ² on an aluminum foil having a thickness of 50 μm. It was 2.6 × 10 ⁹ Ωcm when the volume resistance was measured using a 16008A type resistivity cell manufactured by Hewlett-Packard at 20 ° C. and 65% RH after air-drying. (Composition 3) Kaolin (Hydrasperse, manufactured by Huber, 50% aqueous dispersion): 100 parts Carboxyl-modified SBR latex (solid content 48%):
50 parts oxidized starch (25% aqueous solution): 50 parts melamine resin precondensate (Smirates resin-613,
Sumitomo Chemical, solid content 80%): 3 parts ammonium polystyrene sulfonate (solid content 30)
%): 4 copies

(2) Preparation of electrophotographic lithographic printing original plate A coating solution of composition 3 was applied to a high quality paper having a basis weight of 50 g / m ² by a gate roll coater so that the dry coating amount was 6.5 g / m ² . After drying, it was smoothed using a super calender. The dry coating amount of the adhesive for dry lamination of Example 1 was applied to one side of an aluminum foil having a thickness of 10 μm.
It was coated so as to be 0 g / m ² and laminated with this base paper. After leaving this aluminum foil laminated paper at room temperature for 2 days to perform room temperature aging, the dry laminating adhesive of Example 1 was applied to the other aluminum foil surface at a dry application amount of 3.0 g / m ² . And then laminated again with the base paper. This aluminum foil laminated paper is
It was left to stand for a day and aged at room temperature.

Next, on one side of this aluminum foil laminated paper, the intermediate layer of Example 2 was applied so as to have a dry coating amount of 15 g / m ² and dried.

On the side opposite to the intermediate layer of the aluminum foil-laminated paper, the back coating layer of Example 1 was dried at a coating weight of 15 g /
m ² and dried.

Further, a dry coating amount of 20 g is applied to the surface of the intermediate layer.
/ M ² , the photoconductive layer of Example 1 was applied and dried to prepare a printing plate.

Comparative Example 1 (1) Preparation of High Volume Resistance Coating Solution and Measurement of Volume Resistance Value Acrylic ester resin aqueous emulsion (Movinyl 987, manufactured by Hoechst Synthetic, solid content: 45%) was coated to a thickness of 50 μm.
m of aluminum foil to a dry coating amount of 5.0 g / m ^2, and after air-drying, measure the volume resistance with a Hewlett-Packard 16008A type resistive cell at 20 ° C. and 65% RH. It was 4 × 10 ¹³ Ωcm.

(2) Preparation of an electrophotographic lithographic printing plate precursor The above acrylate resin aqueous emulsion was applied to a high quality paper having a basis weight of 100 g / m ² by a size press so that the dry coating amount was 2.3 g / m ^2. And then smoothed using a machine calender. The adhesive for dry lamination of Example 1 was applied to the base paper so that the dry coating amount was 3.0 g / m ^2, and an aluminum foil having a thickness of 10 μm was laminated. This aluminum foil laminated paper was left at room temperature for 2 days to perform aging at room temperature.

Next, on the aluminum foil side of this aluminum foil laminated paper, the intermediate layer of Example 1 was applied in a dry coating amount of 15 g / m ^2.
And dried.

On the side opposite to the intermediate layer of the aluminum foil-laminated paper, the back coating layer of Example 1 was dried at a coating weight of 15 g /
m ² and dried.

Furthermore, a dry coating amount of 20 g was applied to the surface of the intermediate layer.
/ M ² , the photoconductive layer of Example 1 was applied and dried to prepare a printing plate.

Comparative Example 2 A coating solution of composition (2) was applied to a high-quality paper having a basis weight of 50 g / m ² by a gate roll coater so that the dry coating amount was 0.3 g / m ² , followed by drying. A smoothing process was performed using a calendar. On one side of 10μm thick aluminum foil,
The adhesive for dry lamination of Example 1 was applied so that the dry coating amount was 3.0 g / m ² , and laminated with the base paper. After leaving this aluminum foil laminated paper at room temperature for 2 days to carry out aging at room temperature, the dry application amount of the adhesive for dry lamination of Example 1 on the other aluminum foil surface becomes 3.0 g / m ² . And then laminated again with the base paper. This aluminum foil laminated paper was left at room temperature for 2 days to perform aging at room temperature.

Next, on one side of the aluminum foil laminated paper, the intermediate layer of Example 2 was applied so as to have a dry coating amount of 15 g / m ² and dried.

On the side opposite to the intermediate layer of the aluminum foil laminated paper, the back coating layer of Example 1 was dried at a coating weight of 15 g /
m ² and dried.

Furthermore, a dry coating amount of 20 g was applied to the surface of the intermediate layer.
/ M ² , the photoconductive layer of Example 1 was applied and dried to prepare a printing plate.

Comparative Example 3 The adhesive for dry lamination in Example 1 was changed to the following adhesive for glue laminating, and the dry coating amount was 3.0.
A printing plate was prepared in the same manner as in Example 1 at g / m ² . Acrylic ester resin aqueous emulsion (Movinyl 987, Hoechst synthesis, solid content 45%): 100 parts

The evaluation results are shown in Table 1 collectively. The fog in the table is determined by visually observing the plate-making product under the low humidity conditions, and the blister during plate-making changes according to the preheating state of the plate-making machine heater unit or the heater temperature adjustment scale. The plate was cooled to the point where the temperature reached, and the heater temperature adjustment scale was determined by performing plate making in a state exactly intermediate between the upper and lower limits.

[0059]

[Table 1]

From the results shown in Table 1, it is clear that Examples 1 to 3 do not suffer from fogging during plate making under low humidity conditions, blistering during plate making, and delamination during printing. However, in the case of Comparative Example 1, since a coating layer having a high volume resistance was applied, fogging occurred when plate making was performed under low humidity conditions. Further, in the case of Comparative Example 2, since the coating amount of the coating layer having a low volume resistance value was small and the entire surface of the paper could not be coated, fogging occurred partially when plate making was performed under low humidity conditions. . Further, in the case of Comparative Example 3, since the adhesive between the metal foil and the paper was changed from the adhesive for dry lamination to the adhesive for glue lamination, blisters occurred during plate making and delamination occurred during printing.

[0061]

As is apparent from the above description, according to the present invention, fogging when plate making is performed under low humidity conditions,
Electrophotographic lithography using a metal foil laminated paper as a base material that has excellent electrophotographic properties and printing durability without causing blisters during plate making and delamination between the metal foil and base paper due to penetration of dampening water during printing A substrate for a printing original plate is obtained.

Continuation of the front page (56) References JP-A-3-69964 (JP, A) JP-A-59-3450 (JP, A) JP-A-59-3449 (JP, A) JP-A-58-110293 (JP, A) JP-A-58-36494 (JP, A) JP-A-58-24149 (JP, A) JP-A-58-17449 (JP, A) JP-A-58-16892 (JP, A) 58-8696 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) G03G 13/28 B41N 1/14 G03G 5/10

Claims (1)

(57) [Claims] 1. A metal foil laminated paper as a base material by bonding one or both sides of a metal foil to a base paper with an adhesive,
Directly on the metal foil laminated paper, or in a substrate for an electrophotographic lithographic printing plate precursor provided with an image receiving layer containing a photoconductive substance via an intermediate layer, at 15 ° C. 1.0X10 under the condition of 10% RH
A coating layer having a volume resistance value of ¹² Ωcm or less is provided ,
The dry coating amount of the coating layer is 0.5 g / m ² or more, and
The metal foil and base paper bonded by dry lamination
A substrate for an electrophotographic lithographic printing original plate, characterized by being: