JPH08171171A - Supporting body for photographic printing paper and its production - Google Patents

Abstract

PURPOSE: To easily produce a supporting body for photographic printing paper by using a metallic cylindrical rotating body as a forming face and to provide a photographic printing paper excellent in photographic performance such as sharpness, image clearness and glossiness. CONSTITUTION: An intermediate layer is formed with a polyolefin resin on a paper base body 1 by melt extruding coating method, the surface of a cooling roll used for the melt extruding coating has ruggedness of 0.05-0.7μ in average depth and 0.1-100μ in average pitch, the polyorefin coating layer of the intermediate layer is shaped into fine ruggedness thereby, and an electron beam setting resin coating layer formed by using a drum as the forming face is provided on the intermediate layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photographic printing paper support and a method for producing the same. More specifically, the present invention provides a resin coating layer made of an electron beam cured product of a composition containing an unsaturated organic compound as a main component which is cured by electron beam irradiation (hereinafter referred to as an electron beam curable resin composition). In a process of manufacturing a metal cylindrical rotary body (hereinafter, referred to as a drum) having a mirror surface and coated on a paper substrate with an intermediate layer as a molding surface, the manufacturing is facilitated and sharpness and image are The present invention relates to a support for photographic printing paper having excellent photographic performance such as sharpness and gloss, and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, as a support for photographic printing paper, a polyolefin-coated support produced by coating both sides of a paper base with a polyolefin resin has been widely used. Since the polyolefin coating layer of the support is hydrophobic, compared to baryta paper,
The processing liquid hardly penetrates into the support during development and fixing processing,
Therefore, there is an advantage that the washing time and the drying time are significantly shortened. Further, since the treatment liquid does not penetrate into the paper substrate, the expansion and contraction of the support is suppressed, and the dimensional stability is excellent. It has advantages such as

An inorganic pigment such as titanium dioxide is mixed in the polyolefin resin coating layer of such a support for the purpose of improving the hiding power or resolution, but such a pigment has a dispersibility in the resin. In addition, there is a problem in that the volatile component contained in the pigment causes foaming in the melt extrusion step to cause film cracking in the resin coating layer. Therefore, there is a disadvantage that the pigment content in the coating layer cannot be increased to a sufficient level for improving the hiding power or resolution. Generally speaking, when titanium dioxide is used as the inorganic white pigment, it is difficult to add it in an amount of about 20% by weight or more for the above reason. Therefore, the photographic printing paper obtained by using such a photographic printing paper support cannot be said to be sufficiently satisfactory in image sharpness.

In recent years, Japanese Patent Publication No. 60-17104, Japanese Patent Publication No. 60-17105, and Japanese Unexamined Patent Publication No. 57-4.
Japanese Patent Publication No. 9946 and Japanese Patent Laid-Open No. 5-119431 disclose a photographic printing paper having an electron beam curable resin layer obtained by coating an electron beam curable resin composition on a support and irradiating it with an electron beam for curing. Supports have been proposed. According to this method, it is not necessary to heat the electron beam curable resin composition to a high temperature when forming the coating layer, and the pigment content is 20 to 8
It can be increased up to 0% by weight. Therefore, the image sharpness of the photographic printing paper obtained by using such a support is remarkably improved as compared with the polyolefin resin-coated photographic printing paper, and since heating and cooling are not performed in the manufacturing process, the photographic printing paper is The surface of the paper is excellent.

Further, Japanese Patent Publication No. 5-63784 discloses that
It has been proposed to provide a blocking layer for acrylate monomers between the surface resin coating layer of the electron beam curable resin composition and the paper substrate. It is described that a polyolefin resin coating layer formed by melt extrusion coating is used as the barrier layer.

However, when a mirror finishing roll is used as the cooling roll in the melt extrusion coating step of the polyolefin resin coating layer, the surface of the polyolefin resin coating layer becomes a smooth surface, and the polyolefin resin coating layer is cured from the electron beam cured product. In the step of forming the resin coating layer, the surface of the smooth polyolefin resin coating layer and the surface of the drum are in close contact with each other at the start and the end of the coating of the coating solution layer of the electron beam curable resin composition, causing blocking. As a result, the polyolefin resin coating layer is peeled from the paper, adhered to the surface of the drum, or the paper is cut off. Alternatively, at the time of forming the electron beam curable resin coating layer, both end portions in the width direction of the substrate having the polyolefin resin coating layer not coated with the electron beam curable resin composition adhere to the surface of the drum, and the surface of the drum and the polyolefin resin. Since the surface of the coating layer comes into close contact with the surface to cause blocking, production is hindered and productivity is reduced.

On the other hand, as a method for smoothing the surface of an electron beam-curable resin coating layer, for example, Japanese Patent Publication No. 55-10302 discloses applying a resin material curable by an electron beam onto a moving sheet-shaped substrate. A method of pressing a drum onto the coating liquid layer, irradiating an electron beam from the back surface of the sheet-like substrate to cure the resin material, and then peeling the resin material from the drum, or JP-B-60-17105 or JP-A-59-59. -206043
Japanese Patent Laid-Open Publication No. 2004-242242 discloses that after coating an electron beam curable resin composition on the surface of a drum and bonding the surface of a sheet-like substrate to the surface of the sheet-like substrate, the back surface of the sheet-like substrate is irradiated with an electron beam to cure the coating liquid layer. , Such as a method of peeling from a drum are disclosed. However, in any of these methods, when the surface of the sheet-shaped substrate is smooth, it becomes easy to adhere to the drum, and the surface of the drum and the surface of the polyolefin resin coating layer adhere to each other to cause blocking.

[0008]

DISCLOSURE OF THE INVENTION The present invention provides a resin coating layer comprising an electron beam cured product of an electron beam curable resin composition, which is the above-mentioned problem of the prior art, and an intermediate layer comprising a polyolefin resin on a paper substrate. The invention provides a support for photographic printing paper, which is coated through a sheet, facilitates production using a drum as a molding surface, and has excellent photographic performance such as sharpness, image clarity and gloss, and a method for producing the same. .

[0009]

Means for Solving the Problems The present inventors have made a drum a molding surface by forming a polyolefin resin layer melt-extruded and coated on a paper substrate with a cooling roll having fine irregularities as an intermediate layer. The inventors have found that the above manufacturing becomes easy and have completed the present invention.

The photographic paper support of the present invention comprises a paper substrate,
One having at least one intermediate layer formed on at least one surface of the paper substrate, and a resin coating layer formed on the intermediate layer and comprising an electron beam cured product of an electron beam curable resin composition The intermediate layer is formed by a melt extrusion coating method using at least one kind of resin selected from polyolefin resins, and the surface of the cooling roll used in the melt extrusion coating method has an average depth of 0.05.
.About.0.7 .mu., Having an average pitch of 0.1 to 100 .mu., And at the same time as cooling the intermediate layer polyolefin resin coating layer with the cooling roll, the surface of the polyolefin resin coating layer was imprinted with fine irregularities. It is characterized by that.

The present invention provides a paper base, at least one intermediate layer formed on at least one surface of the paper base, and an electron beam of an electron beam curable resin composition formed on the intermediate layer. In forming a resin coating layer made of a cured product, the intermediate layer is formed by a melt extrusion coating method using at least one resin selected from polyolefin resins, and the surface of a cooling roll used in the melt extrusion coating method. Has an average depth of 0.05 to 0.7 μ and an average pitch of 0.1 to 100 μ, and cools the polyolefin resin coating layer of the intermediate layer with the cooling roll, and at the same time, makes the polyolefin resin surface have fine irregularities. The polyethylene resin coating layer is pressure-bonded to the mirror-finished peripheral surface of the drum via a coating liquid layer containing an electron beam curable resin composition. The coating liquid layer is cured by irradiating it with an electron beam from the back surface of the paper base and continuously peeling from the surface of the drum.

The manufacturing method of the present invention comprises:
A polyolefin resin coating layer is provided by a melt extrusion coating method, and then, an electron beam curable resin composition is applied onto the polyolefin resin coating layer, and a compression-finished drum is pressure-bonded through the coating liquid layer. After irradiating an electron beam from the back surface of the paper substrate to cure the electron beam curable resin composition,
A step of continuously peeling from the peripheral surface of the drum, or an electron beam curable resin composition is applied on the peripheral surface of the drum having a mirror surface, and is laminated with a polyolefin resin coating layer via this coating liquid layer, paper. A step of irradiating an electron beam from the back surface of the substrate to cure the coating liquid layer and then continuously peeling from the peripheral surface of the drum is possible.

In the step of providing the electron beam curable resin coating layer of the present invention on the polyolefin resin coating layer, since the drum is a mirror surface, the surface of the polyolefin resin coating layer having a smooth surface and the drum having a smooth mirror surface are formed. Adhesion with the surface, blocking occurs, it becomes impossible to pass the paper before and after production, and during the production of the electron beam curable resin coating layer,
Since the surface of the polyolefin resin coating layer at both end portions in the width direction where the electron beam curable resin composition of the substrate having the polyolefin resin coating layer is not applied adheres to the surface of the drum and causes blocking, production is hindered. It was

As a result of various investigations on these points, the present inventors have found that at least one intermediate layer formed on at least one surface of the paper substrate as described above, and an electron beam formed on the intermediate layer. A resin coating layer comprising an electron beam cured product of a curable resin composition, wherein the intermediate layer is formed by a melt extrusion coating method using at least one resin selected from polyolefin resins, The surface of the cooling roll used in the melt extrusion coating method is
Average depth 0.05-0.7μ, average pitch 0.1-10
By having the unevenness of 0 μ and cooling the intermediate layer polyolefin resin coating layer by the cooling roll and at the same time molding the polyolefin resin surface with fine unevenness, these problems can be effectively solved and stable. We have found that manufacturing becomes possible.

Here, the depth and pitch of the fine irregularities on the surface of the cooling roll in the present invention are determined according to JIS B.
Based on 0601, ten-point average roughness was measured. The average depth is defined as the simple average of the sum of 10 consecutive depths that are the height difference between the uneven peaks and valleys, and the sum of the 10 consecutive consecutive peaks that are the distance between the uneven peaks and the peaks. Was simply averaged to obtain the average pitch.

In the manufacturing process of the polyolefin resin coating layer of the present invention, the cooling roll used has a surface shape with an average depth of 0.05 to 0.7 μ and an average pitch of 0.
A polyolefin resin coating layer having fine irregularities of 1 to 100 μm and having a fine irregular surface is formed.

Further, specifically, the shape of the fine irregularities may be regular or irregular, and the average depth of the irregularities is 0.05 to 0.7 μm, preferably It is 0.1 to 0.5 μ. Average depth of unevenness is 0.05μ
If it is smaller, the peripheral surface of the drum having a mirror surface and the surface of the polyolefin resin coating layer adhere to each other in the step of providing the electron beam curing resin layer, causing blocking, and if larger than 0.7 μm, the surface of the electron beam curing resin layer. Gloss is reduced and the image clarity is also reduced. The average pitch of the unevenness is 0.1
It is 100 μ, and preferably 1 to 20 μ. When the average pitch of the irregularities is smaller than 0.1 μ, the peripheral surface of the drum and the surface of the polyolefin resin coating layer are in close contact with each other, causing blocking. When the average pitch of the irregularities is larger than 100 μ, the pitch pattern remarkably appears on the surface of the electron beam curable resin coating layer.

In order to form fine irregularities on the surface of the cooling roll used in the present invention, the roll is subjected to surface polishing method such as wet honing or dry honing, vapor deposition method,
Any method such as a sandblast method, an etching method, an electroporation method, a plating method may be used, but among these, the sandblast method is preferable. The shape of the unevenness is not particularly limited.

Examples of the material of the cooling roll include chrome or nickel plating of metal such as stainless steel and iron, and Teflon processing. Chrome plating is particularly preferable.

In the present invention, to form the electron beam curable resin coating layer, any of the following drum casting methods using a drum may be used. (1) An electron beam curable resin composition is applied to the surface of a drum, and a sheet-like substrate provided with a polyolefin resin coating layer on a paper substrate is bonded via this coating liquid layer, and an electron is applied from the back of the paper substrate. A method of irradiating a line to cure the coating liquid layer and continuously peeling it from the drum. (2) The electron beam curable resin composition is applied on the polyolefin resin coating layer provided on one surface of the paper substrate, while the electron beam curable resin composition is applied on the surface of the drum, and these coating solutions are prepared. A method in which the above-mentioned polyolefin resin coating layer and the drum are bonded to each other via a layer, the coating liquid layer is cured by irradiating an electron beam from the back surface of the paper substrate, and continuously peeled from the drum. (3) The electron beam curable resin composition is applied on the polyolefin resin coating layer provided on one surface of the paper substrate, while the electron beam curable resin composition is applied on the surface of the drum to obtain the first electron. After being irradiated with an electron beam from an electron beam irradiation device to be semi-cured, the polyolefin resin coating layer and the drum are bonded to each other through these coating liquid layers, and an electron beam is applied from the back surface of the paper substrate with a second electron beam irradiation device. A method in which the coating liquid layer is cured by irradiation and is continuously peeled from the drum.

The material used for the drum of the present invention is not particularly limited, but stainless steel,
It is preferable to use a material such as copper or chrome to have a smooth peripheral surface that is mirror-finished. Further, if necessary, in order to facilitate the peeling of the cured resin coating layer, it is possible to supply a peeling aid such as silicone oil or wax to the surface of the drum.

The unsaturated organic compound used in the electron beam curable resin composition of the present invention can be selected from the following compounds. (1) Aliphatic, alicyclic and araliphatic 1 to 6 valent alcohol and polyalkylene glycol acrylate compounds (2) Aliphatic, alicyclic and araliphatic 1 to 6 valent Acrylate compounds obtained by adding alkylene oxide to alcohol (3) Polyacryloylalkyl phosphates (4) Reaction product of carboxylic acid, polyol and acrylic acid (5) Isocyanate, polyol and acrylic acid (6) Reaction product of epoxy compound and acrylic acid (7) Reaction product of epoxy compound, polyol, and acrylic acid.

Specifically, as unsaturated organic compounds which can be cured by irradiation with electron beams, polyoxyethylene epichlorohydrin-modified bisphenol A diacrylate, dicyclohexyl acrylate, epichlorohydrin-modified polyethylene glycol diacrylate,
1,6-hexanediol diacrylate, hydroxypivalic acid ester neopentyl glycol diacrylate, nonylphenoxy polyethylene glycol acrylate, ethylene oxide modified phenoxyphosphoric acid acrylate, ethylene oxide modified phthalic acid acrylate, polybutadiene acrylate, caprolactone modified tetrahydrofurfuryl acrylate , Tris (acryloxyethyl) isocyanurate, trimethylolpropane triacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate, dipentaerythritol hexaacrylate, polyethylene glycol diacrylate, 1,4-butadiene diol diacrylate, neopentyl glycol diacrylate Acrylate, and Neopentyl glycol-modified trimethylol propane diacrylate and the like.

The present invention uses these resins alone or
Combinations of more than one type can be used.

In the present invention, the resin coating layer preferably contains a white pigment for the purpose of improving the sharpness of an image when used as a photographic printing paper. As such a white pigment, mainly anatase type or rutile type titanium dioxide, barium sulfate, calcium carbonate, aluminum oxide, zinc oxide, magnesium hydroxide, magnesium oxide and the like can be used, and titanium dioxide is particularly preferable. Further, other additives can be used if necessary.

The content of the white pigment is 20 to 80% by weight of the total solid content of the resin coating layer, preferably 30 to 7%.
0% by weight. If the content is less than 20% by weight, the sharpness of the photographic image of the photographic printing paper obtained will be insufficient, and if it exceeds 80% by weight, the flexibility of the resin coating layer obtained will decrease and film cracking will occur. Sometimes.

To disperse the white pigment in the electron beam-curable unsaturated organic compound as described above, a three-roll mill, two-roll mill, cowles dissolver, homomixer, sand grinder, paint conditioner, and ultrasonic dispersion are used. Machine or the like can be used.

In the production method of the present invention, the method for applying the electron beam curable resin composition is not particularly limited, and examples thereof include bar coating method, roll coating method, air doctor coating method,
Blade coating method, squeeze coating method, air knife coating method, reverse roll coating method, gravure coating method,
Methods such as a transfer coating method, a fountain coating method and a slit die coating method can be used.
Especially when the surface of the drum is used as the molding surface, the roll coating method or the offset gravure coating method using a rubber roll is used to prevent scratching the surface of the drum, and a non-contact type fountain coater is used. The method and the slit die coater method are advantageously used.

The coating amount of the electron beam curable resin coating layer of the present invention is preferably ³ to 60 g / m ² , and particularly 10
˜50 g / m ² is more preferred. When the coating amount is less than 3 g / m ² , coating defects occur and the fine uneven surface of the polyolefin resin surface coating layer affects the glossiness and the image clarity. If the coating amount is more than 60 g / m ² , the cost will be high.

The electron beam irradiation apparatus used in the present invention is not particularly limited in its method, and for example, an electron beam irradiation apparatus such as a van de Graaff scanning method, a double scanning method, and a curtain beam method may be used. Among these, the curtain beam system, which is relatively inexpensive and has a large output, is effectively used. The acceleration voltage at the time of electron beam irradiation is preferably 100 to 300 KV. The absorbed dose of the electron beam may be any one capable of performing desired curing on the unsaturated organic compound, and the value thereof is not particularly limited, but generally 0.1 to 6
It is preferably Mrad, more preferably 0.2 to 4 Mrad. When the absorbed dose is less than 0.1 Mrad, the electron beam curable resin composition may be insufficiently cured by electron beam irradiation. Also, if the absorbed dose exceeds 6 Mrad, the paper substrate may deteriorate due to the impact of the electron beam,
It may cause discoloration and waste energy consumption.

The oxygen concentration in the atmosphere during electron beam irradiation is preferably 500 ppm or less. When the oxygen concentration exceeds 500 ppm, oxygen acts as a retarder for the polymerization reaction, and the curing of the electron beam curable resin composition may be insufficient. It is not possible to use an inert gas such as helium gas, nitrogen gas or argon gas for the purpose of suppressing the generation of ozone due to electron beam irradiation, or for the purpose of cooling windows that generate heat when the electron beam passes. There is no.

The paper substrate used in the present invention is usually 50-
A material having a basis weight of 300 g / m ^{2 and} a smooth surface is used. As the paper substrate, any of those generally used for a photographic printing paper support can be used. As the natural pulp forming the paper substrate, generally, those containing, as a main component, hardwood pulp, softwood pulp, hardwood mixed softwood pulp, etc. are widely used. Further, a filler can be contained in the paper substrate.

Further, it is effective to incorporate a magnesium compound such as a hydroxide, an oxide or a salt into the paper base for the purpose of preventing fog which occurs when the photographic printing paper is stored for a long period of time. Further, the paper base may be blended with additives such as a dry paper strength enhancer, a sizing agent, a fixing agent, a filler, a wet paper strength enhancer and a pH adjuster which are generally used in papermaking. Furthermore, a surface sizing agent on the surface of the paper substrate,
The surface paper may be coated with a strength agent, an antistatic agent, or the like as appropriate.

In the support of the present invention, it is preferable to form a backside resin coating layer made of a film-forming synthetic resin on the surface of the paper base opposite to the surface provided with the electron beam curing resin coating layer. As the film-forming synthetic resin used for forming the backside resin coating layer, a polyolefin resin used for producing a conventional photographic paper support can be used.

As the polyolefin resin for forming the intermediate layer and the backside resin coating layer of the present invention, ethylene,
It can be selected from α-olefins such as homopolymers of propylene and the like, copolymers of at least two kinds of the above olefins, and mixtures of at least two kinds of these various polymers. Particularly preferred polyolefin resins are low density polyethylene, high density polyethylene, linear low density polyethylene, and mixtures thereof. The molecular weight of the polyolefin resin is not particularly limited, but one having a range of 20,000 to 200,000 is usually used. A white pigment, a fluorescent whitening agent, an antioxidant, and a lubricant may be added to the polyolefin resin, if necessary. Particularly, in the intermediate layer, at least one kind of white pigment such as titanium dioxide, zinc oxide, barium sulfate, and calcium carbonate is preferably blended for the purpose of improving the sharpness of the photographic image. For forming the intermediate layer and the backside resin coating layer using a polyolefin resin, a usual melt extrusion coating can be used. The coating amount of the intermediate layer and the backside resin coating layer is 10 to 10, respectively.
It is 40 g / m ² .

[0036]

EXAMPLES The present invention will be described in more detail with reference to the following examples. However, these do not limit the scope of the present invention. In addition, "part" in the examples represents "part by weight" unless otherwise specified.

[0037] subjected to a surface activation treatment by corona discharge on one surface of the paper substrate of Example basis weight of 180 g / m ^2, density 0.950g thereon /
A cm ³ polyethylene resin was melt-extrusion coated to a coating amount of 28 g / m ² to form a backside resin coating layer of polyethylene resin. The cooling roll used at this time had an average depth of surface irregularities of 7.8 μ and an average pitch of 120 μ.

Next, the other surface of the paper substrate is subjected to surface activation treatment by corona discharge, the following polyethylene resin composition is kneaded, and melt extrusion coating is performed so that the coating amount becomes 20 g / m ^2. Then, an intermediate layer made of polyethylene resin was formed. The cooling roll used at this time had an average depth of surface irregularities of 0.3 μ and an average pitch of 10 μ. Ingredients Blended amount Low density polyethylene 60 parts (Trademark: Sumikasen L705, density 0.918 g / cm ³ , manufactured by Sumitomo Chemical Co., Ltd.) Linear low density polyethylene 40 parts (Trademark: UF331, density 0.922 g / cm ³ , Mitsubishi Chemical) Titanium dioxide 15 parts (Trademark: Taipek A220, Ishihara Sangyo)

Next, the following electron beam curable resin composition comprising an unsaturated organic compound and a white pigment was prepared. Component Blend amount Bifunctional urethane acrylate oligomer 50 parts (Trademark: Beamset 505B, manufactured by Arakawa Chemical Industry) Trimethylolpropane triacrylate 20 parts (Trademark: Kayarad TMPTA, manufactured by Nippon Kayaku) Morpholine acrylate 30 parts Titanium dioxide 40 parts ( Trademark: A220, made by Ishihara Sangyo)

A mixture of the above components was mixed and dispersed in a paint conditioner for 1 hour to prepare a mixture. This electron beam curable resin composition was coated on the surface of the intermediate layer which had been subjected to surface activation treatment by corona discharge so that the coating amount after curing was 30 g / m.
It is coated using a reverse roll coater so that it becomes ^2, and pressed with a nip roll on the peripheral surface of the drum having a mirror surface through this coating liquid layer, the acceleration voltage is 300 KV from the back side resin coating layer side of the paper base, and absorption An electron beam is irradiated at a dose of 2 Mrad to cure the electron beam-curable resin composition in the coating liquid layer, and is peeled from the drum via a release roll.
In such a process, from the start of production to the end of production, the surface of the intermediate layer coated with the polyethylene resin and the peripheral surface of the drum did not cause blocking, and the production could be performed without problems.

The obtained sample has a gloss of 96.4% according to JIS Z 8741 of 96.4% and JIS K 71.
The image clarity measured by an optical comb of 1 mm on the basis of No. 05 was 76.2% in the vertical direction and 67.9% in the horizontal direction, and a support for photographic printing paper excellent in glossiness and image definition was obtained. The sharpness of the photographic image was also good by visual evaluation.

Comparative Example 1 When an intermediate layer made of polyethylene resin was provided, a cooling roll having an average depth of irregularities on the mirror-finished surface of less than 0.01 μ was used. Using this sheet-like substrate, an electron beam curable resin coating layer was tried to be provided by the same method as in Example 1, but at the start of coating, the surface of the intermediate layer coated with polyethylene resin and the peripheral surface of the drum were blocked. Cause
Could not be manufactured.

Comparative Example 2 When an intermediate layer made of polyethylene resin was provided, a cooling roll having an average depth of 5 μ and a mean pitch of 300 μ of embossed surface was used. An electron beam curable resin coating layer was provided in the same manner as in Example 1 by using this sheet substrate. The obtained sample had a gloss of 60 degrees of 88.7%, an image definition measured using an optical comb of 1 mm was 68.3% in the vertical direction and 58.7% in the horizontal direction, and was an intermediate layer coated with a polyethylene resin. Due to the influence of the unevenness of No. 1, a glossy feeling was not obtained, and a support for photographic paper having an uneven pattern was obtained. Further, the sharpness of the photographic image was inferior by visual evaluation.

[0044]

The photographic printing paper support of the present invention comprises an intermediate layer made of a polyolefin resin having fine irregularities formed on one surface of a paper substrate, and the electron beam curable resin composition is formed on the intermediate layer. Is applied, and a drum is attached as a molding surface through this coating liquid layer, and a resin coating layer composed of an electron beam cured product cured by electron beam irradiation from the back surface of the paper base is provided, and image sharpness, It has excellent photographic performance such as image clarity and gloss, and is extremely effective in practical use.

Claims (5)

[Claims] 1. A paper substrate, at least one intermediate layer formed on at least one surface of the paper substrate, and an unsaturated organic compound formed on the intermediate layer and curable by electron beam irradiation. A resin coating layer comprising an electron beam cured product of a composition as a component, wherein the intermediate layer is
The surface of the cooling roll formed by the melt extrusion coating method using at least one kind of resin selected from polyolefin resins has an average depth of 0.05 to 0.7 μ and an average pitch of 0.1. ~ 100μ
A support for photographic printing paper, characterized in that the polyolefin resin coating layer of the intermediate layer is cooled by the cooling roll and the polyolefin resin surface is imprinted with fine irregularities. 2. The coverage of the intermediate layer is 10 to 40 g / m ^2.
The support for photographic printing paper according to claim 1. 3. A titanium dioxide which is a white pigment in the intermediate layer,
The photographic paper support according to claim 1 or 2, which contains zinc oxide, barium sulfate or calcium carbonate. 4. A paper substrate, at least one intermediate layer formed on at least one surface of the paper substrate, and an unsaturated organic compound formed on the intermediate layer and curable by electron beam irradiation. In forming a resin coating layer composed of an electron beam cured product of the composition as the main component, the intermediate layer is formed by a melt extrusion coating method using at least one type of resin selected from polyolefin resins, the melt The surface of the cooling roll used in the extrusion coating method has unevenness with an average depth of 0.05 to 0.7 μ and an average pitch of 0.1 to 100 μ, and when the cooling roll cools the intermediate layer polyolefin resin coating layer. At the same time, the polyolefin resin surface is imprinted with fine irregularities, and the polyolefin resin coating layer is formed on the peripheral surface of the metallic cylindrical rotary member that has been mirror-finished. Pressure is applied through a coating liquid layer containing a composition having an unsaturated organic compound as a main component that is cured by irradiation with rays, and the coating liquid layer is cured by irradiating an electron beam from the back surface of the paper base,
A method for producing a support for photographic printing paper, which comprises continuously peeling from the surface of the metal cylindrical rotary member. 5. When forming a resin coating layer made of an electron beam cured product, an accelerating voltage during electron beam irradiation is 100.
~ 300KV and absorbed dose 0.1 ~ 6Mra
The method for producing a support for photographic printing paper according to claim 4, which is d.