JPH1130837A - Base for image material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an image material having extremely good cutting quality, exact cutting size, high stiffness and good curling property by using paper consisting essentially of specific natural pulp as a substrate. SOLUTION: The paper consisting essentially of the natural pulp is used as the substrate and the paper substrate on the side provided with one image forming layer is coated with a resin layer A contg. a resin (a) having film formability and the paper substrate on the opposite side is coated with a resin layer B contg. a resin (b) having the film formability. The paper substrate comprises the natural pulp having the following range as the essential component relating to the natural pulp after beating before chemicals for paper are added: Namely, the value of [(the fiber length of the pulp)/(the freeness of the pulp)] is in a range of 1.4×10<-3> to 2.0×10<-3> (mm/ml) and the fiber length of the pulp is in a range of 0.45 to 0.65 mm. Further, the cutting quality index (C value) expressed by the equation: C value = 100 × (internal bonding strength)<1/2> /(punching force) of the image forming material is >=2.0.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a paper having a film-forming ability on the side on which one image forming layer is provided (hereinafter referred to as "base paper"). For a resin-coated paper type image material coated with a resin layer (A) containing a certain resin (a) and coated on the opposite side with a resin layer (B) containing a resin (b) capable of forming a film. The present invention relates to a support, specifically, an image material having extremely good cutting properties, accurate cutting dimensions, strong stiffness, and good curl properties, and a resin-coated paper mold capable of providing a print thereof. And a support for an image material.

[0002]

2. Description of the Related Art Usually, an image material is composed of a support for an image material and an image forming layer provided on the support. For example, a silver halide photographic material, an ink jet recording material, a heat transfer type thermal transfer recording image-receiving material, a heat-sensitive recording material, a light-sensitive heat-sensitive recording material, and the like are each provided on a support for an image material, a silver halide photographic component layer, an ink image-receiving layer, An image forming layer such as a heat transfer type thermal transfer recording image receiving layer, a thermosensitive coloring layer, a photosensitive thermosensitive coloring layer, and auxiliary functional layers such as an undercoat layer, a protective layer, and a backing layer are provided as needed. In particular, silver halide photographic constituent layers include a silver halide photographic emulsion layer,
Protective layer, undercoat layer, intermediate layer or anti-color mixing layer, anti-halation layer, or filter layer, ultraviolet absorbing layer,
It is composed of a back layer and the like and a combination thereof. For example, a single silver halide photographic material has a silver halide photographic emulsion layer and a protective layer provided on a photographic material support. Further, a multilayer silver halide color photographic material comprises an undercoat layer, a blue-sensitive silver halide photographic emulsion layer and an intermediate layer, a green-sensitive silver halide photographic emulsion layer and an ultraviolet absorbing layer, A silver halide photographic emulsion layer and a silver halide color photographic constituting layer such as a protective layer are provided in this order and are arranged in multiple layers.

Heretofore, resin-coated paper-type supports in which a base paper surface for an image material support is coated with a resin capable of forming a film are well known. As a support for a resin-coated paper type photographic material for silver halide photographic materials, for example, Japanese Patent Publication No. 55-12584 discloses that a base paper is coated with a film-forming resin, preferably a polyolefin resin. In addition, a technique for a support for a photographic material has been disclosed. U.S. Pat. No. 3,501,298 discloses a technique for a photographic material support in which both sides of a base paper are coated with a polyolefin resin. Further, since the rapid photographic development processing method of silver halide photographic materials was applied, a support for photographic materials in which both sides of a base paper were coated with a polyethylene resin has been mainly used for photographic printing paper. If necessary, the resin layer on the side on which one of the image forming layers is provided usually contains a titanium dioxide pigment for imparting sharpness.

[0004] US Patent No. 4,774,224 discloses that
There has been proposed a thermal transfer recording image receiving element having as a support a resin-coated paper having a resin coating having a surface roughness of 7.5 microinch-AA or less, particularly a polyethylene resin-coated paper in which the surface of a base paper is coated with a polyethylene resin. . In addition,
JP-A-63-307979 discloses a technique relating to an ink jet recording sheet having a resin-coated paper as a support.

However, a resin-coated paper-type image material support in which the surface on which the image forming layer is provided of a base paper, especially a base paper mainly composed of natural pulp, is coated with a resin layer still has some serious problems. In fact, there are still many problems and satisfactory results have not yet been obtained.

First, the side on which the image forming layer of the base paper mainly composed of natural pulp is provided (hereinafter, the side on which the image forming layer is provided is the front side, the resin layer coated on the front side is the front resin layer, and the opposite side is the opposite side). On the back side, the resin layer coated on the back side may be abbreviated as a back resin layer) with at least a resin layer containing a resin capable of forming a film, and the back side of the base paper is coated with a resin layer containing a resin capable of forming a film. An image material having a coated resin-coated paper as a support and a print after the image forming process, particularly a silver halide photographic material and a print after a developing process, most of which are roll-shaped prints, are guillotine cutters, precision print cutters (precision print cutters). It is cut to the desired size with a cutter such as a print cutter, but at that time, the image material and prints are not cut accurately, and whiskers are generated from the cut surface, reducing the commercial value Problem not cleaved problems and desired size of causes often occurs.
Further, in a remarkable case, the image material and its print, particularly the silver halide photographic material and its print (the print of the silver halide photographic material may be simply referred to as a photographic print hereinafter) are hardly cut. There was a problem of bending. This phenomenon was observed when cutting a roll-shaped photographic print with a precision print cutter at a high speed, especially when the blade-to-blade interval (hereinafter simply referred to as the blade width) was set wide. .

The inventors of the present invention have conducted various studies on the cutting properties of the image material and its print, and found that the factors affecting the cutting properties are resin-coated paper as a support,
Although there are various factors such as the type of the image forming layer, the type of the cutter, and the cutting conditions thereof, it has been found that the cutting properties of the image material and its print are greatly affected by the factors of the resin-coated paper as the support. Then, the present inventors further conducted various studies on the factors of the resin-coated paper affecting the cutting properties,
The cutting properties of the image material and its print depend on the factors of the resin layer and factors such as the type and properties of the base paper mainly composed of natural pulp, such as the type of natural pulp, fiber length, and stock slurry. Papermaking conditions such as paper additives such as paper additives, papermaking speed, strain pressing, papermaking conditions such as machine calendering conditions, post-processing conditions such as size press, tab size press, and other factors such as rigidity and density of base paper It turns out that it depends on factors. Further, as the thickness of the back resin layer of the resin-coated paper becomes thicker, especially in the case of 20 μm or more, the cutting properties of an image material and a print thereof using the resin-coated paper as a support significantly decrease. The thing turned out.

Second, an image material in which an image forming layer and an auxiliary functional layer are coated on a resin-coated paper-type support and the print quality of the image material are determined by the processability of a processing device for producing a print from the image material. From the viewpoint of the appreciation of the finished print and the like, it is preferable that the image material and the print are strong. However, image materials and prints using conventional resin-coated paper as a support tend to be weak,
In some cases, a problem occurs in the processability of the image material and the appreciation of the print. The tendency of the image material and its print to become weaker is greatly affected by the factors of the resin-coated paper serving as a support, and the more the action is taken in the direction to improve the cutability of the resin-coated paper, the more the stiffness of the resin-coated paper becomes. There is a problem in that the image material and its prints are further weakened.

Further, the image material and its print are slightly negatively curled (curl to the back side opposite to the image forming layer) in view of the processability of the image material, the appreciation of the print, and the sticking property to an album or the like. ) To flatness are preferred. However, conventional image materials and prints using a resin-coated paper as a support tend to have a large plus curl (curl toward the image forming layer side), and have a high processability of the image material.
In some cases, problems occurred in appreciability and sticking of prints. In order to improve the tendency of the image material and the print to be positively curled, the back resin layer of the resin-coated paper used as a support may contain a large amount of high-density polyethylene resin, or the thickness of the back resin layer may be increased. It is often done. However, there is also a problem in that the backing resin layer contains a large amount of high-density polyethylene-based resin, and the cutting properties of image materials and prints using a resin-coated paper having a thick backing resin layer as a support are increasingly deteriorated. did.

For this reason, various proposals have been made to improve the cutting properties of a resin-coated paper-type support. JP-A-55-98748 discloses a base paper having a (strength agent / sizing agent) ratio of 1.8 or more (based on absolute dry weight), preferably a polyethylene resin-coated paper type photographic support. A technique for improving the cuttability of the photographic support using a base paper made of pulp containing no long fiber having a specific size specified in JIS P 8207 and having a specific value is described. However, even with the use of this technique, the improvement of the cutting property of the image material having the support was extremely insufficient, and the rigidity of the image material was insufficient. In particular, in this technology,
In order to improve the curl properties of the image material, if the high-density polyethylene resin is contained in the back resin layer in an amount of more than 65% by weight, the cutting property of the image material becomes more insufficient.

Further, for the purpose of improving the cutability of a resin-coated paper-type photographic support, several base paper techniques have been proposed. Use of a base paper blended with low-viscosity pulp described in JP-A-63-173045, use of a base paper using a pulp slurry beaten with a specific refiner disk described in JP-A-63-256788, Use of a base paper composed of pulp having a specific tensile strength described in JP-A-63-306442, and an average degree of polymerization of 8 described in JP-A-3-149542.
Techniques such as the use of a base paper made of pulp having an internal bonding force of 1.0 to 2.0 (kgf · cm) have been proposed. The improvement of the cutting property of the image material using the coated paper as the support was considerably insufficient, and the improvement of the cutting property and the improvement of the waist could not be achieved at the same time.

On the other hand, for the purpose of improving the curl property or cutting property of a resin-coated paper type photographic support, there are known techniques relating to several back resin layers. Japanese Patent Publication No. 48-963 discloses a photographic support having good curl properties, in which a base paper is coated with a resin composition comprising low-density polyethylene resin: high-density polyethylene resin = 1: 1. Further, JP-A-58-95732 discloses that the density is 0.945 g / c.
It is the m ³ or more, a melt index of 15g / 10 minutes to 40
g / 10 minutes 40 parts by weight of high density polyethylene resin-75
A base paper made of a polyethylene resin composition consisting of 60 parts by weight to 25 parts by weight of a low-density polyethylene resin having a density of 0.930 g / cm ³ or less and a melt index of 1 g / 10 min to 40 g / 10 min. There is a disclosure of a photographic support having good cuttability and curl physical properties, coated with. Furthermore,
JP-A-6-230517, JP-A-6-266046, JP-A
No. 7-36147 discloses that a base paper is coated with a resin composition comprising a high-density polyethylene resin and a low-density polyethylene resin having a critical shear rate of a specific value or less, and has excellent cutting properties and curl properties. There is a disclosure of a support for an image material that does not generate gel.

However, the cutting properties of an image material having a support coated with a resin-coated paper having a base paper coated with a resin composition comprising a low-density polyethylene resin and a high-density polyethylene resin disclosed in these prior arts have been improved to some extent. However, if the blade of the precision print cutter is worn out or the blade width is set to a wide value (for example, if the blade width is set to 70 μm or more, particularly 80 μm or more, particularly 90 μm or more), cutting is performed. Sex was still inadequate. In addition, it is thought that the cutting properties of an image material using a resin-coated paper as a substrate as a substrate are determined by the factors of the base paper, the resin layer, and the image forming layer being intertwined with each other. It was not clear at the moment.

[0014]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to use a paper having natural pulp as a main component and a resin (a) having a film-forming ability on one of the paper substrates on which an image forming layer is provided. A resin substrate coated with a resin layer (A) and a paper substrate on the opposite side coated with a resin layer (B) containing a resin (b) capable of forming a film. Provided is an image material having extremely good cutting properties, accurate cutting dimensions, strong stiffness, and good curl physical properties, and a resin-coated paper-type image material support capable of providing a print thereof. It is to be. Other objects of the present invention will become clear from the description of the following specification.

[0015]

Means for Solving the Problems As a result of intensive studies by the present inventors to solve the above-mentioned problems, a paper having natural pulp as a main component is used as a substrate and one of the image forming layers is provided on one side. Image material support in which a paper substrate is coated with a resin layer (A) containing a film-forming resin (a), and an opposite paper substrate is coated with a resin layer (B) containing a film-forming resin. Wherein the paper substrate is a value of [(pulp fiber length) / (pulp freeness)], as defined below, measured on natural pulp after beating before adding paper chemicals. Is 1.4 × 10 ⁻³ (mm / ml) to 2.0 × 1
0 ^-3 (mm / ml) in the range of, and is intended fiber length of the pulp is configured as a main component of natural pulp in the range of 0.45Mm～0.65Mm, and of the image material support The cutting property index (C value) represented by Expression 2 is 2.0
It has been found that the object of the present invention is achieved by the image material support characterized by the above.

Here, the fiber length of the pulp and the freeness of the pulp are defined as follows. Pulp fiber length: Pulp after beating JAPAN
TAPPI paper pulp test method No. 52-89 Length and weight average fiber length (mm) measured according to "Paper and Pulp Fiber Length Test Method". Freeness of pulp: For pulp after beating, TAPPI
Standard pulp test method NO. T227m-58
Freeness (ml) measured according to "Pulp Freeness (Freeness)".

[0017]

(Equation 2) Expression 2 is the same as Expression 1.

Here, the internal bonding strength and the piercing force are defined as the internal bonding strength (gf · cm / c) of the image material support defined below.
m ² ) and piercing force (gf). Internal bond strength: JAPAN TAPPI Paper pulp test method No. The internal bond strength of the support for image material determined in the papermaking direction of the paper substrate according to 54-93. The strength obtained by the test method is the strength per area of 2.54 cm x 2.54 cm (kgf
cm), the value converted per unit area (cm ² ). Specifically, the internal bond strength (kgf ·
cm) multiplied by 155 to convert to the unit of gf · cm / cm ² . Punching force: Using a needle with a tip having a diameter of 1 mm and a curvature of 0.5 mm, a sample bonded to a ring-shaped sample table having an inner diameter of 11 mm is vertically pierced into the sample at a constant speed of 30 cm / min. Calculate the load when breaking through. Perforation force (unit: gf)
And Specifically, FUDOH manufactured by Leotech Co., Ltd.
The needle is attached to a measuring device having a load detecting function of a rheometer, the sample is vertically pierced at a constant speed of 30 cm / min, and the load variation at that time is continuously recorded to determine the maximum load. The value obtained by converting the value per 220 μm in proportional conversion is defined as the piercing force (unit: gf).

It has been found that the object of the present invention is remarkably achieved by setting the cutting index (C value) to preferably 2.1 or more, particularly preferably 2.2 or more. Another object of the present invention is to increase the internal bonding strength of the support for image materials to 280 (gf · cm / cm ² ) or more.
It has also been found that this can be achieved remarkably by making the piercing force of the support for the image material 900 or less (gf). Further, a resin layer (B) containing a resin (b) capable of forming a film.
It has been found that the object of the present invention, in particular, the precision of the cut dimensions is remarkably achieved by coating a back layer on the side and making the dynamic friction coefficient of the back layer surface 0.32 or more. It has reached.

The resin-coated paper type image material support of the present invention has a cutability index (C value) of 2.0 or more. The cutting index (C value) of the image material support is obtained by dividing the square root value of the internal bonding strength by the perforation force and multiplying by 100, as understood from Equation 2. Therefore, in order to make the cutability index (C value) 2.0 or more, the internal bond strength may be increased and the piercing force may be reduced. Specifically, the support for an image material in the present invention has an internal bond strength of 280 (gf · cm / cm ² ) or more and / or a piercing force of 9 or more.
Those having a value of 00 (gf) or less are preferable.

The base paper used in the practice of the present invention has a value of [(pulp fiber length) / (pulp freeness)] measured on natural pulp after beating before adding paper chemicals. Is 1.4 × 10 ⁻³ (mm / ml) to 2.0 × 10 ⁻³ (mm / ml).
ml) and the fiber length of the pulp is 0.45 mm ~
It is composed mainly of natural pulp in the range of 0.65 mm. When the value of [(pulp fiber length) / (pulp freeness)] is lower than 1.4 × 10 ⁻³ (mm / ml), the piercing force of the image material support tends to decrease. Has a low internal bond strength and consequently has a cleavability index (C
Value) is low, the cutting properties of the image material are poor, and the image material is weak. on the other hand,
[(Pulp fiber length) / (pulp freeness)]
When it is higher than 2.0 × 10 ⁻³ (mm / ml), the piercing force of the support for the image material is significantly increased, the cutability index (C value) is significantly reduced, and the cutability of the image material is reduced. The problem is getting worse. The value of [(pulp fiber length) / (pulp freeness)] is 1.5 from the viewpoint of cutability and stiffness of the image material.
It is preferably in the range of × 10 ^-3 (mm / ml) to 1.8 × 10 ^-3 (mm / ml). The fiber length of the pulp is 0.45.
If the length is shorter than mm, the internal bond strength of the support for the image material is greatly reduced, and the cutability index (C value) is significantly reduced, so that the cutability of the image material is deteriorated and the rigidity of the image material is weakened. Is a problem. On the other hand, if the fiber length of the pulp is longer than 0.65 mm, the piercing force of the support for the image material is significantly increased, the cutability index (C value) is significantly reduced, and the cutability of the image material is deteriorated. Is a problem. The fiber length of the pulp is preferably in the range of 0.49 mm to 0.55 mm.

The value of [(pulp fiber length) / (pulp freeness)] measured on natural pulp after beating before adding paper chemicals is 1.4 × 10 ⁻³ (mm). / Ml) ~
Natural pulp in the range of 2.0 × 10 ⁻³ (mm / ml) and the fiber length of the pulp in the range of 0.45 mm to 0.65 mm is obtained by cutting beat and viscous beat as pulp beat conditions. By optimizing the balance with the above, adjustment can be made preferably. Specifically, the beating conditions such as the ratio of cutting beating to viscous beating, beating time, pulp concentration, beating power, etc. were beaten under a series of experimental conditions. Can be optimized by measuring the freeness.

To increase the internal bonding strength of the support for an image material, preferably to 280 (gf · cm / cm ² ) or more, particularly preferably to 350 (gf · cm / cm ² ) or more, In paper stock slurry, paper strength enhancers such as cationized starch, anionized, cationized or amphoteric polyacrylamide, vegetable galactomannan gum, and polyaluminum hydroxide are added at a solid content of 1.0 per pulp (absolute dry weight). weight%
A fixing agent such as aluminum chloride or bansulfate, which is added in an amount of preferably 1.5% by weight or more, particularly preferably 2.0% by weight or more, is used in combination with a paper strength enhancer and the pH of the stock slurry is adjusted to 6%. Adjust to 0.0-9.0. Pulping of the pulp is preferably a viscous beating with a freeness of 35.
Density of the base paper (calculated excluding ash content in the base paper), which is beaten to 0 ml or less, preferably 320 ml or less
0.95 g / cm ³ or more, preferably 1.0 g / cm ³ or more,
Particularly preferably, two or more methods such as 1.05 g / cm ³ or more are used.

On the other hand, the piercing force of the image material support is reduced, preferably 900 (gf) or less, particularly preferably 80 (gf) or less.
In order to reduce the pulp to 0 (gf) or less, specifically, the beating of the pulp should be performed by cutting beating and not fibrillating (it is necessary to balance with the viscous beating). A pulp, preferably a hardwood sulphite pulp, is used in combination of 15% by weight or more, preferably 30% by weight or more. The density of the base paper (excluding the ash content in the base paper) using a tension press during the drying of the wet paper web Calculated) is at least 1.0 g / cm ³ , preferably 1.05
g / cm ³ or more, and the total thickness of the resin layers on the front and back sides of the image material support is 65 μm or less, preferably 60 μm or less, particularly preferably 55 μm or less. Used.

In order to improve the cutting properties, it is particularly preferable to add an amphoteric polyacrylamide as a paper strength agent to the stock slurry. The addition of amphoteric polyacrylamide increases the internal bond strength as described above, but at that time, the stiffness of the base paper is significantly higher than other paper strength enhancers, and both cutability and stiffness are significantly improved. The obtained base paper is obtained. Furthermore, from the viewpoint of a base paper with a certain waist,
By adding amphoteric polyacrylamide, the basis weight can be reduced, and accordingly the perforation force decreases,
The cutting properties are further improved.

The amphoteric polyacrylamide preferably used in the practice of the present invention is a water-soluble polymer having acrylamide or methacrylamide as a main monomer component and having a cationic group and an anionic group. It is obtained by copolymerizing a mixture of a water-soluble cationic monomer, α, β-unsaturated carboxylic acid and dicarboxylic acid, and specific examples thereof are described in JP-A-4-267250,
Examples thereof include those described in JP-A-58-190948 and JP-A-59-31949.

As the pulp constituting the base paper used in the practice of the present invention, it is advantageous to use appropriately selected natural pulp as described above. Natural pulp was subjected to ordinary bleaching treatment of chlorine, hypochlorite, chlorine dioxide bleaching and alkali extraction or alkali treatment and, if necessary, oxidative bleaching treatment with hydrogen peroxide, oxygen, etc., and a combination treatment thereof Wood pulp of softwood pulp, hardwood pulp, softwood mixed pulp is used,
Various pulp such as kraft pulp, sulfite pulp, soda pulp, and other recycled pulp (waste paper pulp) can be used.

As the cationized starch preferably used in the practice of the present invention, a raw starch such as corn, potato, tapioca or the like is reacted with a halogenated amine such as ethyleneamine, polyalkylenepolyamine or 2-dimethylaminoethyl chloride. A starch containing a tertiary amino group or a quaternary ammonium group or an amphoteric starch containing an anion group in addition to a cationic group, wherein the content of basic nitrogen in the cationized starch is 0%. .1
Those having a content of 5% by weight to 0.50% by weight are preferred.
F and the like.

The anionic polyacrylamide preferably used in the practice of the present invention includes acrylamide homopolymer or partial hydrolyzate of a copolymer of acrylamide with a vinyl monomer copolymerizable with acrylamide,
Alternatively, it is a copolymer of maleic acid, acrylic acid or a salt thereof and acrylamide, and specific examples thereof include Polyaclon ST- manufactured by Hamano Chemical Industry Co., Ltd.
15. Polyaclon CA-4, Polystron 117 manufactured by Arakawa Chemical Industry Co., Ltd., Star Gum A manufactured by Seiko Chemical Co., Ltd.
-15 and the like.

The cationic polyacrylamide preferably used in the practice of the present invention includes Mannich-modified polyacrylamide, Hoffmann decomposition of polyacrylamide, and acrylamide and a cationic monomer such as N, N-dialkylaminoalkyl methacrylate. ,
It is a copolymer with N, N-dialkylaminoalkylacrylamide and the like, and specific examples thereof include Star Gum K-15 manufactured by Seiko Chemical Co., Ltd.

As the vegetable galactomannan gum preferably used in the practice of the present invention, there is guar gum obtained by purifying guar endosperm and chemically denaturing it.
0 can be given. The polyaluminum hydroxide preferably used in the practice of the present invention includes ｛Al
Preferably, it has a structure of (OH) ₃ ｝ n · AlCl ₃ and n = 20 ± 1, and a specific example thereof is Paho manufactured by Asada Chemical Co., Ltd.

In the base paper, the above-mentioned anionic, cationic or amphoteric polyacrylamide, cationized starch, vegetable galactomannan gum, a paper-strength enhancer such as polyaluminum hydroxide, aluminum chloride, bansulfate, etc. In addition to the fixing agent described above, various additives can be incorporated during preparation of the stock slurry. Examples of the sizing agent include fatty acid metal salts and / or fatty acids, alkyl ketene dimer emulsions and / or epoxidized higher fatty acid amides, alkenyl or alkyl succinic anhydride emulsions and rosin derivatives described and exemplified in JP-B-62-7534. Etc., polyvinyl alcohol described in JP-A-63-214748,
Polyamine polyamide epichlorohydrin resin and the like as a wet paper strength enhancer, clay, kaolin, calcium carbonate, titanium oxide and the like as fillers, caustic soda, sodium carbonate, sulfuric acid and the like as pH adjusters, and others as disclosed in JP-A-63-2042.
No. 51, Japanese Patent Application Laid-Open No. 1-266537 and the like, it is advantageous to incorporate a color pigment, a coloring dye, a fluorescent whitening agent and the like as described or exemplified in an appropriate combination.

In the base paper, a composition comprising various water-soluble polymers or hydrophilic colloids or latexes, an antistatic agent, and additives is subjected to size press or tab size press, blade coating, air knife coating, or the like. Can be contained by coating. As a water-soluble polymer or hydrophilic colloid, JP-A-1-66537
JP-A-55-4027, starch-based polymers, polyvinyl alcohol-based polymers, gelatin-based polymers, polyacrylamide-based polymers, cellulose-based polymers, etc., described in or disclosed in JP-A-55-4027. Emulsion or latex of a copolymer containing at least ethylene and acrylic acid (or methacrylic acid) as described or exemplified in JP-A-1-80538, styrene-butadiene, styrene-acryl, vinyl acetate-acryl ,
Emulsion or latex of ethylene-vinyl acetate-based, butadiene-methyl methacrylate-based copolymer and their carboxy-modified copolymers, alkali metal salts such as sodium chloride and potassium chloride, calcium chloride, barium chloride, etc. as antistatic agents Alkaline earth metal salts, colloidal metal oxides such as colloidal silica, organic antistatic agents such as polystyrene sulfonate, pigments such as clay, kaolin, calcium carbonate, talc, barium sulfate, titanium oxide, etc. As a regulator, hydrochloric acid,
It is advantageous to incorporate phosphoric acid, citric acid, caustic soda and the like, and the above-mentioned additives such as coloring pigments, coloring dyes and fluorescent brighteners in an appropriate combination.

The base paper used in the practice of the present invention includes a film thickness unevenness index Rpy defined in the papermaking direction defined below.
Is preferably 250 mV or less, more preferably 200 mV or less, and most preferably 150 mV or less.
The film thickness non-uniformity index Rpy referred to here is a value obtained by using a film thickness measuring device that moves a sample between two spherical styluses and measures a thickness variation of the sample as an electric signal through an electronic micrometer. ± 1 sensitivity range
Under the condition of 5 μm / ± 3 V, the sample was scanned at a constant speed of 1.5 m / min in the papermaking direction after the zero point adjustment to measure the thickness variation of the sample in the papermaking direction. Using an analyzer, a fast Fourier transform is performed using a Hanning window as a time window, and a power spectrum (unit: mV ² ) obtained by averaging 128 times of integration is obtained.
A value (unit: mV) obtained by summing power values in a frequency range of 25 Hz, multiplying by 2/3, and multiplying the resulting value by 1/2.
It is.

As a method for producing a base paper having a thickness unevenness index Rpy of 250 mV or less, which is preferably used in the practice of the present invention, concretely, hardwood pulp which is short fiber and easily smooth is 30% by weight or more. Preferably, 50% by weight or more is used. The base paper is preferably formed by using a fourdrinier paper machine by using an appropriate papermaking method for the stock slurry to which the internal additive has been added so that a uniform formation can be obtained. Specifically, for example, to give appropriate turbulence to the stock slurry,
As a wet part press, a multi-stage wet press, preferably a three-stage or more wet press is used as a wet part press using a fourdrinier paper machine having an appropriate upper dewatering mechanism as described or exemplified in JP-A-61-284762. Performing the final stage of the press part, providing a smooth zinc chloride, making a paper so that uniform formation is obtained by combining appropriate paper making methods, etc., and further using a machine calender, super calender, heat calender etc. after paper making By performing a calendering process, a base paper having a film thickness unevenness index Rpy of 250 mV or less can be manufactured.

The base paper mainly composed of natural pulp used in the practice of the present invention has a cutoff value of 0.8 mm measured using a stylus type three-dimensional surface roughness meter on the front side of the base paper. Center plane average roughness SRa in the papermaking direction (hereinafter referred to as center plane average roughness SRa in the papermaking direction at a cut-off value of 0.8 mm measured using a stylus type three-dimensional surface roughness meter on the front side of the base paper. The term is sometimes simply abbreviated as center plane average roughness SRa) is useful when it is 1.45 μm or less, preferably 1.40 μm or less, more preferably 1.35 μm or less, and more preferably 1.25 μm. The following are particularly preferred. The center plane average roughness SRa at a cutoff value of 0.8 mm measured using a stylus type three-dimensional surface roughness meter referred to in the present specification is:
This is defined by Expression 3.

[0037]

(Equation 3)

In Equation 3, Wx represents the length of the sample surface area in the X-axis direction (papermaking direction), Wy represents the length of the sample surface area in the Y-axis direction (direction perpendicular to the papermaking direction), and Sa Represents the area of the sample surface area.

As a method for producing a base paper having a center plane average roughness SRa of 1.45 μm or less, which is preferably used in the practice of the present invention, concretely, hardwood pulp, which is easy to produce smoothness, preferably hardwood monkey Using 15% by weight or more, preferably 30% by weight or more of pulp, multi-stage pressing is performed during the drying of the wet paper, and after the base paper is formed, at least 2% by using a machine calendar, a super calendar, a heat calendar or the like. A calendar process of a series or more, for example, a machine calendar process and / or a thermal machine calendar process was performed on a base paper as a first series of calendar processes, and then a machine calendar process was further performed as necessary as a second series and subsequent calendar processes. Later JP-A-4-110
By performing a thermal soft calender treatment described or exemplified in Japanese Patent Application Publication No. 939, a base paper having a center plane average roughness SRa of 1.45 μm or less can be produced. Further, various water-soluble polymers or hydrophilic colloids or polymer latexes are coated on a base paper or on a base paper by a size press or a tab size press, a blade coating, an air knife coating or the like to obtain a solid coating amount of 1.0 g / m ² or more, in particular allowed to contain or coating 2.2 g / m ² or more preferably.

[0040] As the density of the base paper of the image material support in the present invention is preferably in the range of ^{0.95g / cm 3 ~1.15g / cm 3} , 1.00g / cm 3 ~1.15g / cm 3 more preferably in the range of the range of 1.05g / cm ³ ~1.10g / cm ³ it is particularly preferred. The density of the base paper is 0.95 g / cm ^{3 to} 1.1.
In order to obtain 5 g / cm ³ , at least two series of calendering using a machine calender, a super calender, a heat calender, etc. after papermaking of the base paper is appropriate, especially after the papermaking of the base paper is optimized. This can be achieved by applying to the base paper under suitable conditions. Base paper density 0.9
If it is less than 5 g / cm ³ , a support for image materials having good surface quality and excellent smoothness cannot be obtained, and the density of the base paper is 1.15 g / c.
m ³ is larger than the image material and printing waist becomes weak problem that. The thickness of the base paper used in the practice of the present invention is not particularly limited.
ones g / m ² ~250g / m ² are useful, 70g / m ² ~
Those with 220 g / m ² are preferred.

Both sides of the base paper of the image material support in the present invention are covered with a resin layer containing a resin capable of forming a film. Thermoplastic resins such as polyolefin resin, polycarbonate resin, polyester resin, polyamide resin and a mixture thereof are preferable as the resin capable of forming the film. More preferred are polyethylene resins. Further, it may be covered with a resin layer composed of an electron beam curable resin described or exemplified in JP-B-60-17104.

The polyethylene resins for the front and back resin layers preferably used in the practice of the present invention include low-density polyethylene resin, medium-density polyethylene resin, high-density polyethylene resin, linear low-density polyethylene resin,
Ethylene and propylene, copolymers of α-olefins such as butylene, ethylene and acrylic acid, ethyl acrylate, copolymers or graft copolymers such as maleic anhydride, so-called carboxy-modified polyethylene resins, Polyethylene resin by high pressure radical polymerization using autoclave type reactor, tubular type reactor, polyethylene resin produced by polymerization using metallocene polymerization catalyst, metal other than metallocene using Ziegler method, Philip method, etc. A polyethylene resin produced by polymerization using a catalyst and a mixture thereof; various densities and melt flow rates (hereinafter, the melt flow rate defined by JIS K 6760 is simply abbreviated as MFR);
Although those having a molecular weight and a molecular weight distribution can be used, usually, the density is in the range of 0.90 to 0.97 g / cm ³ , the MFR is 0.1 g / 10 min to 50 g / 10 min, preferably the MFR is 0.3 g. Those having a range of / 10 min to 40 g / 10 min can be advantageously used alone or in combination.

The polyethylene resin for the back resin layer preferably used in the practice of the present invention is a high-density polyethylene resin 90 having an MFR of 10 g / 10 min to 40 g / 10 min and a density of 0.960 g / cm ³ or more. Parts by weight to 65 parts by weight and MFR
Is a compound resin composition obtained by previously melting and mixing 10 parts by weight to 35 parts by weight of a low-density polyethylene resin or a medium-density polyethylene resin having a density of 0.2 g / 10 min to ³ g / 10 min and a density of 0.935 g / cm ³ or less. Are preferred.

The MFR of the high-density polyethylene resin for the back resin layer preferably used in the practice of the present invention is 10
g / 10 minutes to 40 g / 10 minutes, particularly preferably 10
g / 10 minutes to 30 g / 10 minutes. MFR of the resin is 1
If it is lower than 0 g / 10 min, the cutting properties and curl physical properties tend to be poor, and the adhesion between the base paper and the resin layer, the high-speed processability, etc. deteriorate. In addition, the molding processability is deteriorated, which is not preferable. Also,
0.960 g as the density of high density polyethylene resin
Although / cm ³ or more, density of curling properties elastic modulus lower the lower the resin layer than 0.960 g / cm ^3, not preferable sick like waist, is preferably 0.962 g / cm ³ or more .

The low-density polyethylene resin or medium-density polyethylene resin for the back resin layer preferably used in the practice of the present invention has an MFR of 0.2 g / 10 min to 3 g / 10 min.
However, if it is lower than 0.2 g / 10 minutes, the mixing properties of the resin, the adhesion between the base paper and the resin layer, and the high-speed processability are deteriorated. The processability deteriorates, the cutting properties and the curl physical properties also tend to deteriorate, which is not preferable, and more preferably 0.2 g / 10 min to less than 2 g / 10 min,
Particularly preferably, it is in the range of 0.2 g / 10 min to less than 1 g / 10 min. The density of the low-density polyethylene resin or the medium-density polyethylene resin is 0.935 g / cm ³ or less. If the density is higher than 0.935 g / cm ³ , the moldability of the resin composition, the base paper and the resin layer not preferable adhesive or the like becomes weak and is preferably 0.930 g / cm ³ or less. As the molecular weight distribution of the resin, those having a molecular weight of 500,000 or more and a fraction of 10% by weight or more are preferable, and those having a molecular weight of 12% by weight or more are particularly preferable. If the fraction of the resin having a molecular weight of 500,000 or more is less than 10% by weight, molding processability, particularly neck-in, is undesirably increased. Here, the molecular weight was measured by Waters 150-C (column: Tosoh GMH-XL HT 8 mmφ × 30 cm × 3, solvent: 1,
2,4-trichlorobenzene, temperature: 135 ° C., flow rate:
(1 ml / min) by the GPC method.

The amount of the high-density polyethylene resin used in the compound resin composition comprising a high-density polyethylene resin and a low-density or medium-density polyethylene resin preferably used in the practice of the present invention is 90 parts by weight to 50 parts by weight. A range is useful, preferably in the range from 85 to 60 parts by weight, particularly preferably in the range from 85 to 70 parts by weight. If the amount of the high-density polyethylene resin is less than 50 parts by weight, the curl physical properties and stiffness of the image material are deteriorated. It is not preferable because the adhesiveness between the base paper and the resin layer deteriorates.

As the polyethylene resin for the back resin layer used in the practice of the present invention, a compound resin prepared by melting and mixing in advance is preferable. As a method for preparing a compound resin by previously melting and mixing a low-density polyethylene resin or a medium-density polyethylene resin and a high-density polyethylene resin, a simple melt mixing method, a multi-stage melt mixing method, or the like can be used. For example, using an extruder, a twin-screw extruder, a heating roll mill, a Banbury mixer, a pressure kneader, and the like, a predetermined amount of low-density or medium-density polyethylene resin and high-density polyethylene resin, and if necessary, an antioxidant A method of adding various additives such as a lubricant, melting and mixing, and then pelletizing the mixture is advantageously used. If the polyethylene resin is not used as a compound resin, but directly added to the melt extruder in the state of simple mixing and melt extrusion coated, the adhesion between the base paper and the resin layer, the mixing properties of the resin, the molding process It is not preferable because of poor properties.

The support for an image material according to the present invention is preferably a thermoplastic resin, preferably a polyolefin resin, particularly preferably a polyethylene-based resin, in a front resin layer and a back resin layer on a running base paper. It is manufactured by a so-called melt extrusion coating method in which a resin composition for a front resin layer and a resin composition for a back resin layer are cast from a slit die into a film shape using a melt extruder and coated. Usually, using a melt extruder on a running base paper, the molten resin composition is extruded from the slit die into a film, cast and coated, and pressed between a pressure roll and a cooling roll, It is produced in a series of steps of being separated from the chill roll. At this time, the temperature of the molten film is 280
It is preferable that the temperature is in the range of ℃ to 340 ℃. As the slit die, a flat die such as a T-type die, an L-type die, or a fishtail type die is preferable, and the slit opening diameter is desirably 0.1 mm to 2 mm. Before coating the resin composition on the base paper, the base paper is preferably subjected to an activation treatment such as a corona discharge treatment or a flame treatment. Further, as described in JP-B-61-42254, a resin layer may be coated on a running base paper after spraying an ozone-containing gas onto a molten resin composition in contact with the base paper. The front and back resin layers are preferably sequentially and preferably continuously extrusion-coated on the base paper by a so-called tandem extrusion coating method. It may be coated by a multi-layer extrusion coating method, which has a multi-layer structure of more than layers. The surface resin layer surface of the image material support can be processed into a glossy surface, a finely rough surface described in JP-B-62-19732, a matte surface or a silk surface, and the back resin layer is usually matte. It is preferable to process the surface.

The thickness of the front and back resin layers of the support for image material in the present invention is not particularly limited, but the thickness of the front resin layer is preferably in the range of 9 μm to 60 μm. , Preferably in the range of 12 μm to 45 μm.
The thickness of the back resin layer is usefully in the range of 5 μm to 60 μm, but is preferably in the range of 8 μm to 40 μm. Further, it is preferable that the difference in the amount of resin coating between the front and back resin layers is 3 g / m ² or more by reducing the amount of coating of the back resin layer as compared with the front resin layer.

Various additives can be contained in the front and back resin layers of the support for an image material in the present invention. JP-B 60-3430, JP-B 63-11655, JP-B1-138
No. 91, Japanese Patent Publication No. 1-38292, and titanium oxide, zinc oxide, talc and the like described or exemplified in each gazette such as JP-A-1-105245
White pigments such as calcium carbonate, fatty acid amides such as stearamide and arachidic amide, zinc stearate, calcium stearate, aluminum stearate, magnesium stearate, zinc palmitate, zinc myristate, and fatty acid metal salts such as calcium palmitate Hindered phenols described in or described in JP-A-1-105245, hindered amine, phosphorus-based, various antioxidants such as sulfur-based, cobalt blue, ultramarine, celian blue, blue pigments and dyes such as phthalocyanine blue,
Magenta pigments and dyes such as cobalt violet, fast violet and manganese violet;
Various additives such as a fluorescent whitening agent and an ultraviolet absorber described or exemplified in Japanese Patent No. 254440 can be appropriately combined and contained. These additives are preferably contained as a resin masterbatch or compound. In particular, as a method for incorporating these additives in the compound resin composition for the back resin layer used in the practice of the present invention, a high-density polyethylene resin and a low-density polyethylene resin or a medium-density polyethylene resin, Alternatively, it may be added at the time of preparing the compound resin, or a masterbatch added at a high concentration to the resin may be prepared in advance, and the masterbatch may be added to the resin at the time of melt extrusion coating.

The surface resin layer surface of the support for an image material according to the present invention is subjected to an activation treatment such as a corona discharge treatment or a flame treatment, and then the methods described in JP-A-61-84643, JP-A-1-92740,
An undercoat layer described or exemplified in JP-A-1-102551, JP-A-1-66035 and the like can be applied.

Further, on the surface of the backing resin layer of the image material support in the present invention, after performing an activation treatment such as a corona discharge treatment or a flame treatment, various back layers are coated for antistatic treatment or the like. can do. Further, the back layer may be an inorganic antistatic agent such as colloidal silica, colloidal alumina, hectorite clay colloid and mixtures thereof described or exemplified in JP-A-5-107688, a binder, an organic antistatic agent or both. JP-A-59-21 for the purpose of
No. 4849 or a water-soluble synthetic polymer compound having a carboxyl group or a sulfone group or a salt thereof, or a hydrophilic synthetic polymer colloid substance or a salt thereof, and a polymer described or exemplified in JP-A-59-214849. Latex, starch described or exemplified in JP-A-58-14131, polyvinylpyrrolidone described or exemplified in JP-A-58-45248, polyvinyl alcohol described or exemplified in JP-A-62-220950, Kaisho 63-
Polymers such as chitosan described in 189859 or exemplified, hardeners described or exemplified in JP-B-58-56859, matting agents described or exemplified in JP-A-59-21849, surfactants and the like They can be incorporated in appropriate combinations.

As an apparatus for applying the coating liquid for the back layer, an air knife coater, a roll coater, a bar coater, a blade coater, a slide hopper coater,
A gravure coater, a flexographic gravure coater, a combination thereof and the like can be mentioned. In addition, examples of the drying device for the applied coating liquid include various types such as a linear tunnel dryer, an arch dryer, an air loop dryer, a hot air dryer such as a sine curve air float dryer, an infrared heating dryer, and a microwave dryer. A drying device can be mentioned.

In the present invention, a back layer is coated on the back resin layer (B) side, and the coefficient of dynamic friction of the back layer surface is 0.3.
2 or more, preferably 0.36 or more, particularly preferably
By making it 0.40 or more, the cutting property of the image material,
In particular, the precision of the cutting dimension can be significantly improved. In addition, the dynamic friction coefficient referred to in this specification means that a ferro-type plate is fixed on a horizontal plate according to JIS P8147-1987, a test piece is attached only to a weight, and the moving speed of the lower movable beam is set to 5 per minute.
The dynamic friction coefficient between the back layer surface and the ferrotype plate measured at 00 mm. In order to make the dynamic friction coefficient of the back layer surface of the image material support in the present invention 0.32 or more, specifically, when the back resin layer is melt-extruded and coated, the center surface average roughness SRa of the back layer surface is small. A cooling roll having a rough surface is used (the SRa of the back layer surface having a dynamic friction coefficient in the above range is preferably 1.3 μm or less). For example, a method of using the coating liquid for the back layer (e.g., limiting the amount of the matting agent used to a small amount), or applying the coating liquid for the back layer uniformly and smoothly may be used. As a cooling roll having a surface roughness, a sandblasting method, an etching method, an electric perforation method, a method of forming a rough surface with irregularities by a liquid honing method, or the like is useful. Are preferred. Also, as the material of the cooling roll, nickel or chrome plating of stainless steel, iron, etc.,
Various things such as enamel pull can be used.

The support for the image material in the present invention is coated with various photographic constituent layers, and is used for color photographic paper, black and white photographic paper, typesetting photographic paper, copy photographic paper, reversal photographic material, It can be used for various uses such as silver salt diffusion transfer method for negative and positive, and for printing materials. For example, a silver chloride, silver bromide, silver chlorobromide, silver iodobromide, silver chloroiodobromide emulsion layer can be provided. The silver halide photographic emulsion layer may contain a color coupler to provide a multilayer silver halide color photographic constituting layer. Further, a photographic component layer for a silver salt diffusion transfer method can be provided. As a binder for these photographic constituent layers, in addition to ordinary gelatin, hydrophilic high-molecular substances such as polyvinylpyrrolidone, polyvinyl alcohol and polysaccharide sulfate compounds can be used. Further, the above-mentioned photographic constituent layer can contain various additives. For example, as sensitizing dyes, cyanine dyes, merocyanine dyes, etc., as chemical sensitizers, water-soluble gold compounds, sulfur compounds, etc., as antifoggants or stabilizers, hydroxy-triazolopyrimidine compounds, mercapto-heterocyclic compounds, etc. , Hardening agents such as formalin, vinylsulfone compounds and aziridine compounds, coating aids such as alkylbenzenesulfonates and sulfosuccinate salts, etc., dialkylhydroquinone compounds etc. as antifouling agents, and other fluorescent brighteners, improving sharpness Dye, antistatic agent, pH adjuster,
A fogging agent and a water-soluble iridium compound, a water-soluble rhodium compound, and the like at the time of generation and dispersion of silver halide may be incorporated in an appropriate combination.

The photographic material according to the present invention is subjected to exposure, development, and stoppage according to the photographic material, as described in "Photosensitive Material and Handling Method" (Kyoritsu Shuppan, Goro Miyamoto, Photographic Technology Course 2). , Fixing, bleaching, and stabilization. Further, the multi-layer silver halide color photographic material may be processed with a developer containing a development accelerator such as benzyl alcohol, thallium salt, phenidone, or a developer substantially free of benzyl alcohol. it can.

The support for an image material in the present invention can be used as a support for various thermal transfer recording image-receiving materials by coating various thermal transfer recording image-receiving layers. Examples of the synthetic resin used for the thermal transfer recording image receiving layer include resins having an ester bond such as polyester resin, polyacrylate resin, polycarbonate resin, polyvinyl acetate resin, polyvinyl butyral resin, styrene acrylate resin, and vinyl toluene acrylate resin. , A resin having an urethane bond such as a polyurethane resin, a resin having an amide bond such as a polyamide resin, a resin having a urea bond such as a urea resin, other polycaprolactam resins, styrene resins, polyvinyl chloride resins, vinyl chloride-vinyl acetate Copolymer resins, polyacrylonitrile resins and the like can be mentioned. In addition to these resins, mixtures or copolymers thereof can also be used.

In the thermal transfer recording image receiving layer according to the present invention,
A release agent, a pigment, and the like may be added in addition to the synthetic resin. Solid waxes such as polyethylene wax, amide wax, Teflon powder, fluorine-based,
Phosphate-based surfactants, silicone oils and the like can be mentioned. Among these release agents, silicone oil is most preferred. As the silicone oil, an oily substance can be used, but a curable type is preferred. Examples of the curable silicone oil include a reaction curable type, a photocurable type, and a catalyst curable type, and a reaction curable type silicone oil is particularly preferable. Examples of the reaction-curable silicone oil include an amino-modified silicone oil and an epoxy-modified silicone oil. The amount of the reactive silicone oil added is preferably 0.1% by weight to 20% by weight in the image receiving layer. As the pigment, extenders such as silica, calcium carbonate, titanium oxide, and zinc oxide are preferable. The thickness of the image receiving layer is preferably 0.5 μm to 20 μm, more preferably 2 μm to 10 μm.

The support for an image material in the present invention can be used as a support for various ink-jet recording materials by coating various ink image-receiving layers. Various binders can be contained in the ink image to improve the drying property of the ink and the sharpness of the image. Specific examples of the binder include lime-processed gelatin, acid-processed gelatin, enzyme-processed gelatin, gelatin derivatives, and various gelatins such as phthalic acid, maleic acid, and gelatin reacted with an anhydride of a dibasic acid such as fumaric acid. , Normal polyvinyl alcohols of various saponification degrees, carboxy-modified, cationic-modified and amphoteric polyvinyl alcohols and their derivatives, starches such as oxidized starch, cationized starch, etherified starch, and cellulose derivatives such as carboxymethylcellulose and hydroxyethylcellulose , Polyvinylpyrrolidone, polyvinylpyridium halide, sodium polyacrylate, methacrylic acid copolymer salt, polyethylene glycol, polypropylene glycol, polyvinyl ether, alkyl vinyl ether and maleic anhydride Polymers, styrene / maleic anhydride copolymers and salts thereof, synthetic polymers such as polyethyleneimine, styrene / butadiene copolymers, conjugated diene copolymer latexes such as methyl methacrylate / butadiene copolymer, polyvinyl acetate , Vinyl acetate
Maleic acid ester copolymer, vinyl acetate / acrylic acid ester copolymer, vinyl acetate polymer latex such as ethylene / vinyl acetate copolymer, acrylic acid ester polymer, methacrylic acid ester polymer, ethylene / acrylic acid ester Acrylic polymer or copolymer latex such as copolymer, styrene / acrylate copolymer, vinylidene chloride copolymer latex, etc., or functional group-containing monomer such as carboxyl group of these various polymers Functional group-modified polymer latex, melamine resin, aqueous adhesive such as thermosetting synthetic resin such as urea resin and polymethyl methacrylate, polyurethane resin, unsaturated polyester resin, vinyl chloride / vinyl acetate copolymer, polyvinyl butyral, Synthetic resin-based adhesive such as alkyd resin, Japanese Patent Publication 3-24906 No., JP-A-3-281383, Japanese Patent Application No. 4-2
Examples thereof include inorganic binders such as alumina sol and silica sol described and exemplified in each publication such as No. 40725, and these can be used alone or in combination.

The ink image-receiving layer of the ink-jet recording material according to the present invention may contain various additives in addition to the binder. For example, as a surfactant, a long-chain alkylbenzene sulfonate, a long-chain, preferably an anionic surfactant such as a branched alkyl sulfosuccinate ester salt, a long-chain, preferably a polyalkylene oxide of a phenol containing a branched alkyl group. Nonionic surfactants such as ethers and polyalkylene oxide ethers of long-chain alkyl alcohols, JP-B-47-9303
Silane coupling agents such as γ-aminopropyltriethoxysilane, N-β (aminoethyl) γ-aminopropyltrimethoxysilane, such as fluorinated surfactants described in US Pat. No. 3,589,906 and the like; As a polymer hardener, an active halogen compound, a vinyl sulfone compound, an aziridine compound, an epoxy compound,
Hardening agents such as acryloyl compounds and isocyanate compounds, as preservatives, P-hydroxybenzoic acid ester compounds described in or exemplified in JP-A-1-102551, benzisothiazolone compounds, isothiazolone compounds, and the like, JP-A-63-204251 , Described or exemplified in each publication such as JP-A 1-266537, a coloring pigment, a coloring dye, a fluorescent whitening agent,
Sodium hydroxymethanesulfonate and sodium P-toluenesulfinate as yellowing inhibitors; benzotriazole compounds having a hydroxy-di-alkylphenyl group at the 2-position as ultraviolet absorbers; Japanese Patent No. 4-1337 discloses organic or inorganic fine particles having a particle size of 0.2 μm to 5 μm, such as starch granules, barium sulfate, and silicon dioxide, as pencil writing agents such as the polyhindered phenol compounds described or exemplified in Japanese Patent No. 105245. Appropriate combinations of organopolysiloxane compounds described or exemplified in gazettes and the like, and various additives such as caustic soda, sodium carbonate, sulfuric acid, hydrochloric acid, phosphoric acid, citric acid, octyl alcohol, and silicon-based antifoaming agents as a pH adjuster Can be included.

[0061]

EXAMPLES Next, in order to explain the present invention more specifically,
An embodiment will be described.

Example 1 A base paper was manufactured according to the following formulations AC. These base papers have a film pressure unevenness index RPy in the range of 190 mV to 230 mV, and a center average roughness SRa on the front side of 1.1 μm.
１．２1.2 μm.

(Formulation A) Bleached hardwood bleached kraft pulp was beaten such that the fiber length and freeness of the pulp were as shown in Table 1, and then 100 parts by weight of pulp (hereinafter referred to as absolutely dry parts of pulp) Cationized starch, 0.2 parts by weight of anionized polyacrylamide, 0.2 parts by weight of an alkyl ketene dimer emulsion (as ketene dimer), epoxy 0.2 parts by weight of a fluorinated higher fatty acid amide, 0.4 parts by weight of a polyamide epichlorohydrin resin and an appropriate amount of an optical brightener, a blue dye,
A stock slurry was prepared by adding a red dye. afterwards,
The stock slurry is placed on a fourdrinier machine running at 200 m / min to form a web while giving appropriate turbulence.
After performing a three-stage wet press in which the linear pressure was adjusted in the range of 15 kg / cm to 100 kg / cm in the wet part, treated with a smoothing roll, and then continued in the dry part at 30 kg / c.
After performing a two-stage tension press in which the linear pressure was adjusted in the range of m to 70 kg / cm, the resultant was dried. Thereafter, during the drying, 25 g / size press solution consisting of 4 parts by weight of carboxy-modified polyvinyl alcohol, 0.05 parts by weight of fluorescent whitening agent, 0.002 parts by weight of blue dye, 4 parts by weight of sodium chloride and 92 parts by weight of water. m ² size was pressed, the finally obtained base paper moisture is dried to be 8 wt% in absolute dry moisture, linear pressure 70
Machine calendered at kg / cm, basis weight is 170g /
A base paper having an m ² and a density of 1.04 g / cm ³ was produced. (Blend B) After beating the hardwood bleached kraft pulp so that the fiber length and the freeness of the pulp become the values shown in Table 1, the amount (solids) shown in Table 1 was added to 100 parts by weight of the pulp. Parts by weight) of polyaluminum hydroxide, 2.2 parts by weight of cationized starch, 0.2 parts by weight of anionic polyacrylamide, 0.2 parts by weight of an alkyl ketene dimer emulsion (as ketene dimer), epoxidation Same as Formulation A, except that 0.2 parts by weight of higher fatty acid amide, 0.4 part by weight of polyamide epichlorohydrin resin and a stock slurry prepared by adding an appropriate amount of an optical brightener, a blue dye and a red dye are used. Thus, a base paper having a basis weight of 170 g / m ² and a density of 1.04 g / cm ³ was produced.

(Blend C) After beating hardwood kraft pulp, the pulp was beaten such that the fiber length and freeness of the pulp became the values shown in Table 1, and the amount shown in Table 1 was added to 100 parts by weight of the pulp. (Parts by weight) of maploid gum, the amount (parts by weight) of anionized polyacrylamide shown in Table 1, 0.7 parts by weight of aluminum chloride (as solid content), and the pH of the stock slurry was 6.9 to 7. 1 amount of caustic soda, alkyl ketene dimer emulsion (as ketene dimer)
Use a stock slurry prepared by adding 0.2 parts by weight, 0.2 parts by weight of an epoxidized higher fatty acid amide, 0.4 parts by weight of a polyamide epichlorohydrin resin, and an appropriate amount of an optical brightener, a blue dye and a red dye. Except for the above, a base paper having a basis weight of 170 g / m ² and a density of 1.04 g / cm ³ was produced in the same manner as in Formulation A.

Next, after the base paper surface (back surface) opposite to the side on which the image forming layer is provided is subjected to corona discharge treatment, the following resin composition (R1) is applied to the back surface at a resin temperature of 315 ° C. and a resin thickness of 20 μm. In addition, melt extrusion coating was performed at a running speed of the base paper of 200 m / min. At this time, as a cooling roll, the center surface average roughness SRa of the back layer surface after applying the following back layer was used.
Used had a roughness of 1.15 μm. The cooling roll used was a cooling roll roughened by a liquid honing method and operated at a cooling water temperature of 12 ° C.

(Resin composition R1) High-density polyethylene resin (density 0.967 g / cm ³ , MFR = 15 g / 10 min) 70
Parts by weight and low density polyethylene resin (density 0.924g / c
(m ³ , MFR = 0.6 g / 10 min) 30 parts by weight using a melt extruder to melt and mix in advance, and used as pellets.

Subsequently, after the surface of the base paper was subjected to a corona discharge treatment, a low-density polyethylene resin (density 0.92
0 g / cm ³ , MFR = 8.5 g / 10 min) 47.5% by weight, aluminum hydroxide (Al ₂ O _{3 with} respect to titanium dioxide)
50% by weight of an anatase type titanium dioxide pigment surface treated with 0.75% by weight) and 2.5% of zinc stearate.
Masterbatch 20 of titanium dioxide pigment by weight
Parts by weight, low density polyethylene resin (density 0.920g / c
m ³ , MFR = 4.5 g / 10 min) 65 parts by weight and high density polyethylene resin (density 0.970 g / cm ³ , MFR = 7.0 g /
10 minutes) A resin composition consisting of 15 parts by weight was heated to a resin temperature of 315
The base paper was melt-extruded to a thickness of 28 μm at a running speed of 200 m / min. In addition, the melt extrusion coating of the front and back polyethylene resins was performed by a so-called tandem method in which extrusion coating was performed sequentially. At that time, the surface of the resin layer containing the titanium dioxide pigment of the resin-coated paper was processed into a glossy surface.

Further, after processing the front and back resin layers and before winding, the back resin layer surface of the resin-coated paper is subjected to a corona discharge treatment.
The following coating solution for the back layer was applied on-machine. As dry weight, colloidal silica: styrene latex =
The coating liquid for the back layer containing 1: 1 and further containing 0.021 g / m ² of sodium polystyrene sulfonate and another appropriate amount of a coating aid was 0.21 as a latex component (calculated as solid weight).
The coating amount was g / m ² . In addition, the dynamic friction coefficient of the back layer surface was 0.37.

Further, after coating the back layer and before winding the resin-coated paper, a corona discharge treatment was applied to the resin surface on the front side, and 1.2 g of lime-treated gelatin and low molecular weight gelatin (Nitta Gelatin Co., Ltd.) P-3226) 0.3 g,
0.3 g of a 10% by weight methanol solution of butyl paraoxybenzoate and 0.45 g of a 5% by weight mixture of sulfosuccinic acid-2-ethylhexyl ester methanol and water
And a subbing liquid having a total amount adjusted to 100 g with water was uniformly applied on-machine to a gelatin coating amount of 0.06 g / m ² to obtain a support for an image material.

Then, a blue-sensitive emulsion layer containing a yellow color coupler, an intermediate layer containing an anti-color-mixing agent, a green emulsion layer containing a magenta color coupler, a UV-absorbing layer on the undercoat layer of the support for image materials. A UV-absorbing layer containing a coloring agent, a red-sensitive emulsion layer containing a cyan color coupler, and a protective layer so that the total amount of gelatin was 8 g / g.
m ² and is color - have created a photographic paper. Each color-sensitive emulsion layer comprises a silver chlorobromide which corresponds to 0.6 g / m ² with silver nitrate, further formation of the silver halide, other gelatin required dispersion and film formation, an appropriate amount of antifoggants, the sensitizing dye , A coating aid, a hardener, a thickener, and an appropriate amount of a filter dye. Next, the prepared color photographic paper was stored at 35 ° C. and normal humidity, and then color-developed to prepare a color photographic print, and the following evaluation was performed.

As a method for evaluating the cutting property of the image material, the above-mentioned 8.2 cm wide roll-shaped color photographic print was prepared using a precision print cutter in which the blade width was set to 80 μm.
And cut so that the length direction becomes the size of 11.7cm,
The condition of the cut surface was evaluated. The evaluation criteria are grades 10 to 9; the cutting rate with a cutter is 100%, there is almost no beard from the cut surface, and the cutting properties are very good. Grade 8 to 7; the cutting rate with a cutter is 100%. And the generation of a beard from the cut surface was slight and the cutability was good. Grade 6 to 5;
%, There is whiskers from the cut surface, but there is no practical problem. %, Which is practically a problem or the cutting rate is 100%, but the generation of whiskers from the cut surface is extremely large, and the practically problematic grade 2
1; the cutting rate of the cutter is 0% (the failure rate is therefore 10%)
0%), and 100% unless the blade width is reduced by 20 μm or more.
In this case, and also in this case, many whiskers are generated from the cut surface, which means that there is some practical problem.

As a method for evaluating the stiffness of the image material,
A 13 cm × 18 cm color photographic print was shaken up and down with the edges of the color photographic print by 10 monitors, and the waist strength by touch was evaluated. The evaluation criteria are as follows: ：: the waist is quite strong, ○: the waist is strong, Δ: the waist is slightly weak, but it is practically possible, ×: the waist is weak, and there is a practical problem.

Table 1 shows the obtained results.

[0074]

[Table 1]

Note that (Note 1) to (Note 8) in Table 1 are as follows.

(Note 1) ○ indicates a sample according to the present invention.

(Note 2) to (Note 4) Fiber length (L) of pulp (unit: measured by the method described in the text of the specification)
mm) and pulp freeness (V) (unit: ml) and 10 ³ ×
(L) / (V) = 10 ³ × [(pulp fiber length) / (pulp freeness)] (unit: mm / ml).

(Note 5) The amount (parts by weight) of a variable amount of the chemical in each formulation as a solid content per 100 parts by weight of the pulp is shown. Note that + starch represents cationized starch, -PAA represents anionized polyacrylamide, PAl represents polyaluminum oxide, and gum represents Mayploid Gum 7700 (manufactured by May Hall Chemical Co., Ltd.).

(Note 6) to (Note 7) Internal bonding strength (gf · c) of the image material measured by the method described in the text of the specification.
m / cm ² ) and piercing force (gf).

(Note 8) Indicates the cutting property index (C value) of the image material specified in the specification.

From the results shown in Table 1, the base paper was a support for image materials in which both sides of the base paper were coated with a resin layer, and the base paper was measured on natural pulp after beating before adding a paper chemical. , [(Pulp fiber length) / (pulp freeness)] is from 1.4 × 10 ⁻³ (mm / ml) to 2.0 × 10 ⁻³ (mm /
ml) and the fiber length of the pulp is 0.45 mm ~
The support for an image material according to the present invention, comprising a natural pulp in the range of 0.65 mm as a main component, and having a cutting property index (C value) of the support for an image material of 2.0 or more. Body (Sample Nos. 3 to 8 and Nos. 12 to N
o. It can be clearly seen that 14) is an excellent support for image materials, which has good cutting properties of the image material and is strong.
In particular, in view of the cuttability of the image material, the support for the image material (sample Nos. 4 to 7 and No. 13) whose cutability index (C value) of the support for the image material is 2.1 or more. To No. 14), preferably 2.2 or more.
o.5 to No.7 and No.14) are particularly preferable.

Further, from the viewpoint of the cutting property and stiffness of the image material, the value of [(pulp fiber length) / (pulp freeness)] is 1.5 as natural pulp constituting the base paper. × 10
^-3 (mm / ml) to 1.8 × 10 ^-3 (mm / ml) and a pulp fiber length of 0.47 mm to 0.55 mm. No.4 to No7 and N
o.13) is preferable. Considering the physical properties of the support for an image material, the support for an image material having an internal bond strength of 350 (gf) or more (samples No. 7 and No. 7) in view of the cutting property and the stiffness of the image material. It can be clearly understood that 14) is particularly preferable.

On the other hand, a support for an image material other than the present invention which uses a natural pulp having a cutability index (C value) of less than 2.0 or a natural pulp constituting the base paper which does not satisfy the requirements of the present invention ( Samples No. 1 to No. 2 and No. 9 to No. 11) clearly show that the cutting properties of the image material are poor and that the waist is weak, which causes problems.

Example 2 Example 2 was carried out in the same manner as in Example 1 except that the base paper produced according to the following formulation D was used. In addition, those base papers have a film pressure unevenness index RPy in a range of 210 mV to 220 mV, and a center average roughness SRa on the front side of 1.1 μm to 1.2 μm.
m.

(Formulation D) Hardwood bleached kraft pulp was beaten such that the fiber length and freeness of the pulp after beaten were as shown in Table 2, and then 100 parts by weight of pulp (hereinafter, absolutely dry parts of pulp) ), The amount of cationized starch shown in Table 2 (parts by weight), the amount of anionized polyacrylamide shown in Table 2 (parts by weight), and the amphoteric amount of the amount shown in Table 2 (parts by weight) 0.2 parts by weight of polyacrylamide, alkyl ketene dimer emulsion (as ketene dimer), 0.2 parts by weight of epoxidized higher fatty acid amide, 0.4 parts by weight of polyamide epichlorohydrin resin, and an appropriate amount of fluorescent whitening agent, blue dye A red dye was added to prepare a stock slurry. Thereafter, the stock slurry is placed on a fourdrinier machine running at 200 m / min, and a paper web is formed while giving appropriate turbulence.
After performing a three-stage wet press in which the linear pressure was adjusted in the range of g / cm, treated with a smoothing roll, and in the subsequent drying part, a two-stage in which the linear pressure was adjusted in the range of 30 kg / cm to 70 kg / cm After the pressing under a high pressure, drying was performed. Then, during the drying, 25 g / size press solution consisting of 4 parts by weight of carboxy-modified polyvinyl alcohol, 0.05 parts by weight of fluorescent whitening agent, 0.002 parts by weight of blue dye, 4 parts by weight of sodium chloride and 92 parts by weight of water. m ² size was pressed, the finally obtained base paper moisture is dried to be 8 wt% in absolute dry moisture, and the machine calender treatment at the linear pressure of 70 kg / cm, a basis weight described in Table 2 values (G / m ² ) and a base paper having a density of 1.04 g / cm ³ were produced.

Table 2 shows the obtained results.

[0087]

[Table 2]

Note that (Note 1) to (Note 4) and (Note 6) to (Note 8) in Table 2 have the same meanings as those in Table 1, and (Note 9) is as follows. .

(Note 9) Indicates the amount (parts by weight) of a variable amount of a chemical in each formulation as a solid content per 100 parts by weight of pulp. In addition, + starch represents cationized starch, -PAA represents anionized polyacrylamide, and ± PAA represents amphoteric polyacrylamide.

From the results shown in Table 2, as in Example 1, the support for the image material in which both sides of the base paper were covered with the resin layer,
The base paper had a value of [(pulp fiber length) / (pulp freeness)] of 1.4 × 10 ⁻³ (measured on natural pulp after beating before adding paper chemicals). mm / ml) to 2.0
It is composed mainly of natural pulp in the range of × 10 ^-3 (mm / ml) and the fiber length of the pulp is in the range of 0.45 mm to 0.65 mm. The support for an image material according to the present invention having a cutability index (C value) of 2.0 or more (all samples in Table 2, samples
No. 19-No. 23) has good cutting properties of the image material,
It is an excellent support for an image material that is strong and stiff, and from the viewpoint of the cuttability of the image material, the support for the image material has a cutability index (C value) of 2.1 or more. (Samples No. 21 to No. 23) are preferable, and the support for image materials (Samples No. 21 and No. 23) of 2.2 or more is particularly preferable.

Further, from the viewpoint of the cutting property and stiffness of the image material, a support for an image material to which amphoteric polyacrylamide is added (sample No. 21 to No. 23) are better than the support for the image material without the addition (samples No. 19 and No. 20).

Example 3 Sample No. 1 of Example 1 6, in place of the cooling roll used when coating the resin composition for the back resin layer, the center surface average roughness SRa of the back layer surface after the back layer is applied,
1.02 μm, 1.15 μm, 1.35 μm or 1.
Sample No. 1 of Example 1 was used except that a cooling roll having a roughness of 58 μm was used. 6 was carried out.

As a method for evaluating the cutting accuracy of the image material, a 8.2 cm wide roll-shaped color photographic print is measured to be 11.7 cm long by a precision print cutter with a blade width of 80 μm. And the length of the cut sample was measured and evaluated. As evaluation criteria, grades 10 to 9; cutting dimensions are less than 0 to 0.1 mm, and cutting precision is extremely good, and grades 8 to 7; cutting dimensions are less than 0.1 to 0.2 mm, and cutting precision is Good,
Grades 6 to 5; cutting dimensions are less than 0.2 to 0.5 mm, and cutting accuracy is of a level that does not pose a practical problem, and grades 4 to 3;
The cutting dimension is 0.5 mm or more, and the cutting precision has some practical problems, and grades 2 to 1 indicate the degree to which the cutting precision cannot be discussed in the first place.

Table 3 shows the obtained results. The internal bond strength, piercing force, and cutability index (C value) of each sample were as follows. 6 and almost the same.

[0095]

[Table 3]

Note that (Note 1) and (Note 10) in Table 3
It is as follows.

(Note 1) ○ indicates a sample according to the present invention.

(* 10) The coefficient of kinetic friction measured by the method described in the main text.

From the results in Table 3, it can be seen that the image material support of the present invention has a dynamic friction coefficient of the back layer surface of preferably 0.32 or more, more preferably 0.36 or more, from the viewpoint of cutting accuracy and cutability. It can be clearly seen that it is particularly preferably 0.40 or more.

Example 4 The following resin composition (R2) or (R3) was used in place of the resin composition (R1) for the back resin layer used in Sample No. 6 of Example 1, and Table 3 The procedure was performed in the same manner as in Sample No. 6 of Example 1, except that the thickness of the resin layer was changed to that described in Example 1.

(Resin composition R2) High-density polyethylene resin (density 0.967 g / cm ³ , MFR = 6.8 g / 10 min)
65 parts by weight and low density polyethylene resin (density 0.926
g / cm ³ , MFR = 3.5 g / 10 min) The resin composition was simply mixed with 35 parts by weight, and was added to the melt extruder as it was and used as it was.

(Resin composition R3) The same resin composition as the resin composition (R1).

The curl physical properties of the image material were evaluated at 8.2 ° C. × 1 at 20 ° C. and 40% RH.
A 1.7 cm color photographic print was evaluated for curl. As evaluation criteria, grade ○: slightly negative curl (curl toward the back layer side) and extremely flat,
Good curl properties, Grade △: Curls are present but there is no problem in practical use, Grade X;

Table 4 shows the obtained results. In addition, the internal bond strength, the piercing force, and the cutability index (C value) of each sample were almost the same as Sample No. 6.

[0105]

[Table 4]

Note that (Note 1) in Table 4 has the same meaning as in Table 1.

From the results in Table 4, it can be seen that the support for the image material in the present invention is a high-density polyethylene resin and a low-density or medium-density polyethylene resin as the polyethylene resin for the backing resin layer in view of the cutting properties and the curl properties. It is well understood that a compound containing a high-density polyethylene resin and using a compound resin composition containing a high-density polyethylene resin as a main component is preferable.

Example 5 An ink jet recording material was prepared by applying the following ink image receiving layer on the image material support of sample No. 6 of Example 1 in place of the multilayer silver halide color photographic constituting layer. . As a result, the cutting properties, cutting accuracy and curl physical properties of the ink jet recording material were good, and the rigidity was strong, and the support for the image material was excellent.

The ink image-receiving layer was made of 30 g of a 10% by weight aqueous solution of an alkali-treated gelatin having a molecular weight of 70,000, sodium carboxymethyl rose (having a degree of etherification of 0.7 to 0.1%).
8, 37.5 g of an 8 wt% aqueous solution of a 2 wt% aqueous solution having a viscosity of 5 cp or less using a B-type viscometer, and 0.3 g of a 5 wt% methanol solution of an epoxy compound (NER-010 manufactured by Nagase & Co., Ltd.) A coating solution consisting of 0.5 g of a 5% by weight mixture of methanol and water of sulfosuccinic acid-2-ethylhexyl ester salt and 31.7 g of pure water was applied in a solid content of 7 g / cm ² for 7 minutes.

[0110]

According to the present invention, a paper can be used as a substrate, which can provide an image material having good cutting properties, accurate cutting dimensions, strong stiffness, and good curl physical properties and a print thereof. An excellent resin-coated paper-type support for an image material can be provided.

Claims (10)

[Claims] 1. A paper substrate on which one image forming layer is provided, which is coated with a resin layer (A) containing a resin (a) having a film forming ability, using a paper mainly composed of natural pulp as a substrate. The opposite side paper substrate is a support for an image material coated with a resin layer (B) containing a resin (b) capable of forming a film, and the paper substrate is a natural material after beating before adding a paper chemical. Measured on the pulp, as defined below,
[(Pulp fiber length) / (pulp freeness)]
1.4 × 10 ⁻³ (mm / ml) to 2.0 × 10 ⁻³ (mm / ml)
And the fiber length of the pulp is from 0.45 mm to 0.4 mm.
It is characterized by comprising a natural pulp in the range of 65 mm as a main component and a cutting property index (C value) of the support for image material represented by Formula 1 being 2.0 or more. Image material support. Here, the fiber length of the pulp and the freeness of the pulp are defined as follows. Pulp fiber length: About pulp after beating, JAPAN
TAPPI paper pulp test method No. 52-89 Length and weight average fiber length (mm) measured according to "Paper and Pulp Fiber Length Test Method". Freeness of pulp: For pulp after beating, TAPPI
Standard Pulp Test Method No. T227m-58
Freeness (ml) measured according to "Pulp Freeness (Freeness)". (Equation 1) Here, the internal bonding strength and the piercing force are the internal bonding strength (gf · cm / cm ² ) and the piercing force (gf) of the image material support defined below. Internal bond strength: JAPAN TAPPI Paper pulp test method No. The internal bond strength of the support for image material determined in the papermaking direction of the paper substrate according to 54-93. The strength obtained by the test method is the strength per area of 2.54 cm x 2.54 cm (kgf
cm), the value converted per unit area (cm ² ). Specifically, the internal bond strength (kgf ·
cm) multiplied by 155 to convert to the unit of gf · cm / cm ² . Punching force: Using a needle with a tip having a diameter of 1 mm and a curvature of 0.5 mm, a sample bonded to a ring-shaped sample table having an inner diameter of 11 mm is vertically pierced into the sample at a constant speed of 30 cm / min. Find the load when breaking through. Perforation force (unit: g)
f). Specifically, FUD manufactured by Leotech Co., Ltd.
The needle is attached to a measuring machine having a load detecting function of an OH rheometer, the sample is vertically pierced at a constant speed of 30 cm / min, and the load variation at that time is continuously recorded to determine the maximum load. A value obtained by converting the value per 220 μm in proportional conversion is defined as a piercing force (unit: gf). 2. The imaging material support according to claim 1, wherein a cutting property index (C value) is 2.1 or more. 3. The support for an image material according to claim 1, wherein the cutability index (C value) is 2.2 or more. 4. An image material support having an internal bonding strength of 28
4. The support for an image material according to claim 1, wherein the support is 0 (gf · cm / cm ² ) or more. 5. A piercing force of a support for an image material is 900 (g).
f) The support for an image material according to claim 1, 2, 3 or 4, wherein 6. An imaging material support according to claim 1, wherein the paper substrate comprises amphoteric polyacrylamide. 7. A back layer is provided on the side of the resin layer (B) containing the resin (b) capable of forming a film, and the back layer has a dynamic friction coefficient defined below of 0.32 or more. The support for an image material according to claim 1, 2, 3, 4, 5, or 6. Coefficient of dynamic friction: A ferro-type plate was fixed on a horizontal plate according to JIS P8147-1987, and the test piece was adhered only to the weight. Dynamic friction coefficient of the plate. 8. The image material according to claim 1, wherein the resin (a) capable of forming a film in the resin layer (A) is a polyolefin resin or a polyester resin. Support. 9. The support for an image material according to claim 8, wherein the polyolefin resin is a polyethylene resin. 10. The resin layer (A) contains a titanium dioxide pigment.
Or a support for an image material according to item 9.