JPH09230534A - Base body for image material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an image material having good cutting property and curling property and to obtain a resin-coated paper base body for an image material for the print by controlling the thickness to be in a specified range and controlling the cutting index to have a specified value. SOLUTION: This base body for image material is used to obtain an image material having 195 to 250μm thickness and >=1.3 cutting index (c-valve). The c-value is defined by c=10 × (inner bonding strength)<1/2> /(tear strength). The inner bonding strength and the tear strength are defined by the following method. The inner bonding strength is obtd. by measuring the inner bonding strength of an image material in the paper making direction of the paper matrix according to JAPAN TAPPI paper pulp testing method No.54-93 and then calculating in terms of the strength per unit area (cm<2> ). Prectically, to objective strength is obtd. by multiplying the inner bonding strength (kgf.cm) determined by the testing method above multiplied by 155. The tear strength is the force (gf) required to tear one sheet of the image material according to JIS P 8116.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION In the present invention, a paper containing natural pulp as a main component is used as a substrate, and one of the paper substrates provided with an image forming layer (hereinafter sometimes referred to as base paper) has a film forming ability. The present invention relates to a resin-coated support for paper-type image material, which is coated with a resin layer (A) containing a certain resin, and the paper substrate on the opposite side is coated with a resin layer (B) containing a polyethylene-based resin. The present invention relates to an image material having extremely good cuttability, a cut dimension being accurate as designed, and good curl properties, and a resin-coated paper type image material support capable of providing a print thereof.

[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 and heat sensitive recording material, a silver halide photographic constituent layer, an ink image receiving layer, respectively on a support for image material, An image forming layer such as a heat transfer type thermal transfer recording image receiving layer, a thermosensitive coloring layer, a light and thermosensitive coloring layer, and if necessary, an auxiliary functional layer such as an undercoat layer, a protective layer and a back layer are coated. In particular, as the silver halide photographic constituent layer, a silver halide photographic emulsion layer,
Protective layer, undercoat layer, intermediate layer or color mixing prevention layer, antihalation layer, or filter layer, ultraviolet absorption 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.

Conventionally, a resin-coated paper type support having a base paper surface coated with a resin capable of forming a film for a support for an image material is well known. As a support for photographic materials for use in silver halide photographic materials, for example, JP-B-55-125
Japanese Patent Publication No. 84 discloses a technique for a support for photographic material in which a base paper is coated with a resin capable of forming a film, preferably a polyolefin resin. U.S. Pat.No. 3,501,2
Japanese Patent Publication No. 98 discloses a technique for a support for photographic materials 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, supports for photographic materials in which both sides of a base paper were coated with a polyethylene resin have been mainly put to practical use 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.

Further, US Pat. 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 surface roughness of 7.5 microinch-AA or less, particularly a polyethylene resin-coated paper obtained by coating the surface of a base paper 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 support for a resin-coated paper type image material in which the surface of the base paper, particularly the base paper mainly composed of natural pulp, on which the image forming layer is provided is coated with a resin layer is still serious. In reality, it has problems and has not yet obtained satisfactory results.

First, the side of the base paper mainly composed of natural pulp on which the image forming layer 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 coated with a resin layer containing at least a resin capable of forming a film, and the back side of the base paper is coated with a resin layer containing a polyethylene resin. Image materials having resin-coated paper as a support and prints after the image forming processing, especially silver halide photographic materials and prints after the developing processing, mostly roll-shaped prints are guillotine cutters and precision prints.
Although it is cut into a desired size with a cutter such as a cutter (precision print cutter), the image material and print are not cut accurately at this time, and whiskers are generated from the cut surface, which reduces the commercial value. Problems and problems of not being cut to the desired size often occurred. Also,
In a remarkable case, the image material and its print, especially 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) bends without being cut. There was a problem of being lost. This phenomenon was observed when a roll-shaped photographic print was cut at high speed with a precision print cutter, especially when the blade-to-blade spacing (hereinafter simply referred to as the blade width) was set wide. .

Therefore, as a result of various examinations by the inventors of the present invention on the cuttability of the image material and its print, the factors affecting the cuttability include resin-coated paper as a support,
Although there are various factors such as the image forming layer, the type of cutter and the cutting conditions thereof, it has been found that the cutting property of the image material and its print is greatly influenced by the factor of the resin-coated paper as the support. Therefore, the present inventors further investigated various factors of the resin-coated paper that affect the cuttability,
The cuttability of the image material and its print depends on the factors of the resin layer and the factors such as the type and properties of the base paper whose main component is natural pulp, such as the type of natural pulp, the fiber length and the stock slurry. Various conditions such as paper slurry conditions such as paper additives, papermaking speed, pressure press, machine calendering conditions, post-processing conditions such as size press and tab size press, and stiffness and density of base paper. It turned out to be dependent on the factors. Further, as the thickness of the back resin layer of the resin-coated paper becomes thicker, particularly when it is 20 μm or more, the cuttability of the image material having the resin-coated paper as a support and the print thereof is significantly reduced. There was found.

Secondly, the curl of 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 curl of the print are treated by a processing device when a print is made from the image material. From the viewpoint of the image quality and the easiness of appreciation of the finished print and the ease of sticking to the album, the image material and the print thereof are preferably slightly curled (curl to the back side opposite to the image forming layer) and extremely flat. . However, the image material and the print thereof using the conventional resin-coated paper as a support tend to have a large plus curl (curl toward the image forming layer side), and the processability of the image material is
Problems with print appreciation and sticking often occurred.
The tendency of the image material having the resin-coated paper as a support and the print thereof to be curled mainly depends on the shrinkage force of the binder contained in the image forming layer and the auxiliary functional layer. When the above gelatin was used, it was particularly remarkable in silver halide photographic materials and photographic prints using gelatin as a main binder, and it was even more remarkable in an environment of low humidity.

In order to improve the tendency of this image material and its print to curl, 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. Is often thickened. However, an image material containing a large amount of high-density polyethylene resin in the back resin layer or using a resin-coated paper having a thick back resin layer as a support and the print thereof have a problem that the cutting property thereof is further deteriorated. .

Therefore, various proposals have been made so far in order to improve the cuttability of the resin-coated paper type support.
JP-A-55-98748 discloses a base paper having a ratio of (strength agent / size agent) of 1.8 or more (absolute dry weight basis) in a polyethylene resin-coated paper type photographic support, preferably J
A technique for improving the cuttability of a resin-coated paper photographic support by using a base paper composed of pulp without long fibers having a specified nominal size defined by ISP 8207 is described. However, even when this technique is used, the cutting property of the image material having the support is insufficiently improved, and the curling property of the image material is extremely insufficient. In particular, in this technique, if the high-density polyethylene resin is contained in the back resin layer in an amount of more than 65% by weight in order to improve the curling property of the image material, the cutting property of the image material becomes further insufficient. was there.

Further, several base paper techniques have been proposed for the purpose of improving the cuttability of the resin-coated paper type photographic support. Use of base paper blended with low-viscosity pulp described in JP-A-63-173045, use of base paper using 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 average polymerization degree of 80 described in JP-A-3-149542.
Techniques such as the use of base paper composed of pulp of 0 or more and having an internal binding force of 1.0 to 2.0 (kgf · cm) have been proposed. It was considerably insufficient to improve the cuttability of an image material having a coated paper as a support, and extremely insufficient to improve the cutting accuracy and curl of a print.

On the other hand, for the purpose of improving the curling property or cutting property of a resin-coated paper type photographic support, there are known techniques relating to some back resin layers. JP-B-48-9963 discloses a photographic support having good curl physical properties, in which a base paper is coated with a resin composition composed of a low-density polyethylene resin: high-density polyethylene resin = 1: 1. Further, in JP-A-58-95732, 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 high density polyethylene resin 40 parts by weight to 75
A polyethylene resin composition comprising 60 parts by weight to 25 parts by weight of a low-density polyethylene resin having a weight ratio of 0.930 g / cm ³ or less and a melt index of 1 g / 10 minutes to 40 g / 10 minutes. There is a disclosure of a photographic support having good cutting property and curl physical properties, which is coated with. Furthermore,
JP-A-6-230517, JP-A-6-266046, JP-A
No. 7-36147 discloses that the base paper is coated with a resin composition consisting of a high-density polyethylene resin and a low-density polyethylene resin whose critical shear rate is a specific value or less, and the cuttability and curl properties are good. In addition, there is a disclosure about a support for an image material which does not generate gel.

However, the cuttability of an image material having a resin-coated paper obtained by coating a base paper with a resin composition composed of a low-density polyethylene resin and a high-density polyethylene resin disclosed in these prior arts as a support is improved to some extent. However, if the blade of the precision print cutter is worn out or the blade width is set wide (for example, if the blade width is set to 80 μm or more, especially 90 μm or more, especially 100 μm or more), cutting The property was still insufficient, and the cut size of the print was inaccurate. Further, it is considered that the cuttability of an image material having a resin-coated paper as a substrate and a support as a substrate is determined by the factors of the base paper, the resin layer, and further the image forming layer being intertwined with each other. It was the present situation that it was not clear.

[0014]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to use a paper containing natural pulp as a main component as a substrate, and the paper substrate on the side on which one of the image forming layers is provided contains a resin capable of forming a film. A support for a resin-coated paper-type image material, which is coated with a layer (A) and a paper substrate on the opposite side is coated with a resin layer (B) containing a polyethylene-based resin, and has extremely excellent cuttability, An object of the present invention is to provide a support for resin-coated paper-type image material, which can provide an image material having a cut dimension as designed and accurate, and good curl properties, and a print thereof. 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 made by the present inventors in order to solve the above-mentioned problems, as a result, a paper containing natural pulp as a main component is used as a substrate and one of the image forming layers is provided. A support for an image material, wherein a paper substrate is coated with a resin layer (A) containing a resin capable of forming a film, and a paper substrate on the opposite side is coated with a resin layer (B) containing a polyethylene resin, For an image material, characterized in that the thickness of the image material having the support for the image material is 195 μm to 250 μm, and the cuttability index (C value) represented by the number 2 of the image material is 1.3 or more. It has been found that the support achieves the objects of the invention.

[0016]

[Equation 2] The expression 2 is the same as the expression 1.

The internal bond strength and tear strength are the internal bond strength (gf · cm / cm ² ) and tear strength (gf) of the image material defined below. Internal bond strength: The internal bond strength of the image material determined in the papermaking direction of the paper substrate according to Japan TAPPI Paper Pulp Test Method No. 54-93. The strength obtained by the same test method is 2.54 cm
Since the strength per unit area (kgf · cm) is × 2.54 cm, the value converted per unit area (cm ² ). Specifically, it is converted into a unit of gf · cm / cm ² by multiplying 155 by the internal bond strength (kgf · cm) obtained by the same test method. Tear strength: The force (gf) required to tear one image material, which is determined according to JIS P 8116.

Another object of the present invention is the cuttability index (C
It has been found that it is remarkably achieved by setting the value) to preferably 1.4 or more, particularly preferably 1.5 or more.

Further, a back layer is coated on the side of the resin layer (B) containing a polyethylene-based resin, and the cut-off value of the back layer surface measured by a stylus type three-dimensional surface roughness meter is 0.8 mm. The square value of the center surface average roughness (SRa) in the papermaking direction at 0.85 μm ^{2 to} 2.0 μm ² , preferably 1.0 μm
It has been found that by setting m ^{2 to} 1.7 μm ² , the object of the present invention, in particular, the accuracy of the cut size can be remarkably achieved. Furthermore, as the resin layer (B) containing a polyethylene resin, the infrared dichroic ratio (D value) defined below is 0.85.
By using the following, preferably 0.75 or less, particularly preferably 0.65 or less, and 0.55 or more, the object of the present invention is achieved synergistically more significantly. The present invention has been accomplished by finding out what is done.

Infrared dichroic ratio (D value): The resin layer (B) coated on the side opposite to the side on which the image forming layer is provided without the back layer is the aqueous solution of sodium hypochlorite. Peeled from the paper substrate by, the infrared absorption spectrum of the peeled film is measured by the infrared light polarized by the polarizing plate,
72 derived from the lateral vibration of CH ₂ of the polyethylene molecule
0 cm ^-1 Request peak intensity of 720 cm ^-1 towards the front and rear in the two infrared absorption peaks of before and after the 730 cm ^-1 before and after. The peak intensity of absorbance was determined smallest point and the line connecting the absorbance in the 725cm ^-1 ~775cm ^-1 of the most absorbance small point in the 675cm ^-1 ~725cm ^-1 as a baseline It is a value. At this time, the peak intensity A (=) around 720 cm ⁻¹ by infrared light polarized parallel to the traveling direction (longitudinal direction) at the time of melt extrusion and the infrared light polarized vertically The peak intensity A (+) around 720 cm ^-1 was obtained, and the ratio of A (=) / A (+) was calculated by the infrared dichroic ratio (D
Value).

In the present invention, the infrared dichroic ratio (D value) of the resin layer (B) having a back layer can be measured by, for example, shaving the back layer on the surface of the resin layer to completely remove it. Further, depending on the constitution of the back layer, the binder in the back layer may be dissolved by using an aqueous solution of sodium hypochlorite or the like so as not to affect the physical properties of the resin layer, so that the binder can be completely removed and measured. At this time, it is possible to determine whether or not it is completely removed by measuring infrared absorption and the like.

The resin-coated paper-type image material support of the present invention has a cutability index (C) of the image material having the support.
The value) is 1.3 or more. In order to make the cutting ability index (C value) of the image material 1.3 or more, when the thickness of the image forming layer is 12 μm or less, the cutting ability index (C value) of the image material and the support for the image material are used. Which is substantially the same as that of No. 1, and has a cutting ability index (C value) of the support for image materials of 1.3.
That is all. Cleavability index (C
The value) is obtained by dividing the square root value of the internal bond strength by the tear strength and multiplying by 10, as can be understood from Equation 2. Therefore, in order to set the cuttability index (C value) to 1.3 or more, the internal bond strength may be increased and the tear strength may be decreased. Specifically, the support for image material used in the practice of the present invention preferably has an internal bond strength of 350 (gf · cm / cm ² ) or more and / or a tear strength of 130 (gf) or less. ..

In order to increase the internal bond strength of the support for image materials, preferably 350 (gf · cm / cm ² ) or more,
Specifically, a paper strength agent such as cationized starch, anionized, cationized or amphoteric polyacrylamide, maploid gum, etc. is used in an amount of 2.5% by weight or more with respect to pulp (absolute dry weight), preferably 3.5 wt% or more,
Particularly preferably, 4.5% by weight or more is added, and the beating of the pulp is preferably viscous beating, and the beating to a canadine standard freeness of 320 ml or less, preferably 300 ml or less is used in the stock slurry. 0.3% polyaluminum hydroxide per pulp
Added by weight% or more, preferably 0.6 weight% or more,
The density of the base paper (calculated excluding the ash content in the base paper) is 0.9
At least 5 g / cm ³ , preferably at least 1.0 g / cm ³ , particularly preferably at least 1.05 g / cm ³ , are used two or more, preferably three or more.

On the other hand, in order to weaken the tear strength of the image material support, preferably to 130 (gf) or less, specifically, the pulp is preferably beaten by cutting (thus viscous beating). It is preferable to optimize the balance with), the length load average fiber length measured according to JAPAN TAPPI Paper and Pulp Test Method No. 52-89 "Paper and Pulp Fiber Length Test Method" is 0.45 mm. ~ 0.7
mm, preferably 0.45 mm to 0.65 mm. As a pulp, a hardwood bleached pulp, preferably a hardwood sulfite pulp is used in combination of 15% by weight or more, preferably 30% by weight or more. The density of the base paper (calculated excluding the ash content in the base paper) is 1.0 g / cm ³ or more, preferably 1.05 g, using tenacity pulp during the drying of
/ Cm ³ or more, the total thickness of the resin layers on the front and back of the image material support is 65 μm or less, preferably 60 μm or less, particularly preferably 55 μm or less.
One or more, preferably three or more are used.

The support for an image material according to the present invention has a thickness of 195 μm to 25 when the image material having the support is used.
The thickness is 0 μm, but from the viewpoint of the overall effect of the present invention, the thickness is preferably 205 μm to 235 μm. Since the thickness of the image forming layer is usually 2 μm to 12 μm,
The thickness of the support for image materials is from 183 μm to 248.
Useful in the range of μm, but preferably 193 μm to 2
It is in the range of 33 μm. If the thickness of the support for image material is too thin, the image material and its print will be less stiff, and it will have a flat feeling.
In particular, it is a problem that paper passing property, workability, etc. are deteriorated in the development processing step of photographic paper, and on the other hand, if the thickness of the support for image material becomes too thick, curling curl of the roll-shaped image material becomes large, As a result, the curl properties of the print deteriorate, which is a problem.

[0026] 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 achieve 5 g / cm ³ , it is appropriate to optimize the tightness press and wet press in the papermaking process, and in particular, use at least two series of calendering using a machine calender, super calender, thermal calender, etc. after the papermaking of the base paper. This is achieved by carrying out the base paper under various conditions. Base paper density is 0.9
When it is less than 5 g / cm ³ , a support having good surface quality and excellent in smoothness cannot be obtained, and the density of the base paper is 1.15 g / c.
If it is larger than m ^3, the stiffness of the image material and its print becomes weak, which is a problem.

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

As the cationized starch which is preferably used in the practice of the present invention, raw starch such as corn, potato and tapioca is reacted with halogenated amine such as ethyleneamine, polyalkylene polyamine and 2-dimethylaminoethyl chloride. It is a starch containing a tertiary amino group or a quaternary ammonium group or an amphoteric starch containing an anion group in addition to a cation group, and the content of basic nitrogen in the cationized starch is 0. .1
5 wt% to 0.50 wt% is preferable, and specific examples thereof include Cato manufactured by Oji National Co., Ltd.
F etc. can be mentioned.

The anionic polyacrylamide preferably used in the practice of the present invention is a partial hydrolyzate of an acrylamide homopolymer or a copolymer of a vinyl monomer copolymerizable with acrylamide and acrylamide,
Alternatively, it may be a copolymer of maleic acid, acrylic acid or a salt thereof with acrylamide, and specific examples thereof include Polyacron ST- manufactured by Hamano Chemical Industry Co., Ltd.
15, Polyacron CA-4, Arakawa Chemical Industry Co., Ltd. Polystron 117, Starlight Chemical Co., Ltd. Stargum A
-15 etc. can be mentioned.

As the cationic polyacrylamide preferably used in the practice of the present invention, a Mannich modified product of polyacrylamide, a Hoffmann degradation product of polyacrylamide, acrylamide and a cationic monomer such as N, N-dialkylaminoalkylmethacrylate are used. ,
Examples thereof include copolymers with N, N-dialkylaminoalkylacrylamides and the like, and specific examples thereof include Stargum K-15 manufactured by Hoshiko Kagaku Co., Ltd.

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 cation group and an anion group. It is obtained by copolymerizing a mixture of a water-soluble cationic monomer, an α, β-unsaturated carboxylic acid and a dicarboxylic acid, and specific examples thereof are disclosed in JP-A-4-267250 and JP-A-
Examples thereof include those described in JP-A-58-190948 and JP-A-59-31949.

The plant galactomannan gum preferably used in the practice of the present invention is guar gum obtained by purifying guar endosperm and chemically denatured. Specific examples thereof include maploid gum 770 manufactured by Mayhole Chemical Co., Ltd.
0 can be mentioned. The polyaluminum hydroxide preferably used in the practice of the present invention includes {Al
Those having a structure of (OH) ₃ } _n · AlCl ₃ and having n = 20 ± 1 are preferable, and specific examples thereof include Paho manufactured by Asada Chemical Co., Ltd.

In the base paper, in addition to the above-mentioned anionic, cationic or amphoteric polyacrylamide, cationized starch, dry paper strengthening agent such as vegetable galactomannan, polyaluminum hydroxide, etc., paper stock slurry. Various additives can be included in the preparation. As a sizing agent, a fatty acid metal salt or / and a fatty acid, JP-B-62-7
Alkyl ketene dimer emulsion or epoxidized higher fatty acid amide, or alkenyl or alkyl succinic anhydride emulsion described in 534 or exemplified, rosin derivative and the like, polyvinyl alcohol described in JP-A-63-214748, wet paper As a strength enhancer, polyamine polyamide epichlorohydrin resin, etc., as a filler, clay, kaolin, calcium carbonate, titanium oxide, etc., as a fixing agent,
Aluminum chloride, water-soluble aluminum salts such as vanadium sulphate, etc., such as caustic soda, sodium carbonate, sulfuric acid, etc. as a pH adjusting agent are also disclosed in JP-A 63-204251.
Coloring pigments or coloring dyes described or exemplified in JP No. 7 etc.,
It is advantageous to contain an appropriate combination of optical brighteners and the like.

In the base paper, a composition comprising various water-soluble polymers or hydrophilic colloids or latexes, antistatic agents, and additives is size-pressed or tab-size pressed or blade-coated, air knife-coated, etc. Can be included by coating. As a water-soluble polymer or hydrophilic colloid, JP-A 1-266537
The starch-based polymer, the polyvinyl alcohol-based polymer, the gelatin-based polymer, the polyacrylamide-based polymer, the cellulose-based polymer, etc. described or exemplified in Japanese Patent Publication No. Emulsion or latex of a copolymer containing ethylene and acrylic acid (or methacrylic acid) at least as constituents described or disclosed in Kaihei 1-180538, styrene-butadiene system, styrene-acrylic system, vinyl acetate-acrylic system. ,
Emulsion or latex of ethylene-vinyl acetate-based, butadiene-methyl methacrylate-based copolymers and their carboxy-modified copolymers, as antistatic agents, alkali metal salts such as sodium chloride and potassium chloride, calcium chloride, barium chloride, etc. 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, pH As a regulator, hydrochloric acid,
Advantageously, phosphoric acid, citric acid, caustic soda, and the like, as well as the above-mentioned color pigments, color dyes, optical brighteners, and other additives are appropriately combined and contained.

The base paper used in the practice of the present invention is a thickness unevenness index Rpy in the paper making direction defined below.
Is preferably 250 mV or less, more preferably 200 mV or less, most preferably 150 mV or less.
The film thickness unevenness index Rpy referred to here is an electronic micrometer using a film thickness measuring instrument that runs a sample between two spherical stylus and measures the thickness variation of the sample as an electric signal through an electronic micrometer. Sensitivity range is ± 1
The thickness variation in the papermaking direction of the sample was measured by scanning at a constant speed of 1.5 m / min in the papermaking direction of the sample after adjusting the zero point under the condition of 5 μm / ± 3 V, and the obtained measurement signal value was used as the FFT. Using an analyzer, use a Hanning window for the time window to perform a fast Fourier transform, and obtain a power spectrum (unit: mV ² ) based on the arithmetic mean of 128 integrations.
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, specifically, 30% by weight or more of hardwood pulp, which is short fiber and easy to smooth, It is preferably used in an amount of 50% by weight or more and beaten by a beater so that the long fiber content is reduced as much as possible. For example, beating of the pulp is preferably such that the weighted average fiber length of the pulp after beating is 0.4 mm to 0.75 mm. Next, a base paper is preferably made by a Fourdrinier paper machine by adopting a suitable paper making method for a paper stock slurry to which internal additives are added so that a uniform formation is obtained. Specifically, for example, using a Fourdrinier paper machine having a suitable upper dewatering mechanism as described or exemplified in JP-A-61-284762, which gives a suitable turbulence to a stock slurry, wet part As a press, a multi-stage wet press, preferably a wet press with three or more stages, and a smoothing crawl at the final stage of the press part are combined so that a uniform texture can be obtained by combining appropriate papermaking methods. Then, the base paper having a thickness unevenness index Rpy of 250 mV or less can be manufactured by performing the paper-making, and then performing the calendering using a machine calender, a super calender, a heat calender or the like after the paper-making.

The base paper containing natural pulp as a main component used in the practice of the present invention has 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. Center surface average roughness SRa in the paper making direction (hereinafter, the center surface average roughness SRa in the paper making 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 abbreviated as the center surface average roughness SRa) is useful, and is preferably 1.45 μm or less, more preferably 1.40 μm or less, further preferably 1.35 μm or less, and 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 this specification is
It is defined by Equation 3.

[0038]

(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 surface average roughness SRa of 1.45 μm or less, which is preferably used in the practice of the present invention, specifically, sulfite pulp, which is easy to produce smoothness, preferably hardwood 3 sulfite pulps
0% by weight or more, preferably 50% by weight or more, is subjected to multi-stage pressure pressing during the drying of the wet paper, and after the base paper is made, at least two or more series are prepared using a machine calender, super calender, thermal calender, etc. After calendering, for example, machine calendering and / or thermo-mechanical calendering as the first series of calendering on the base paper, and then machine calendering as needed for the second series of calendering, and the like. 4-11
By performing the thermal soft calendering treatment described or exemplified in Japanese Patent Publication No. 0939, it is possible to manufacture a base paper having a center surface average roughness SRa of 1.45 μm or less. Also, various water-soluble polymers or hydrophilic colloids or polymer latices in or on the base paper are applied as a solid coating amount of 1.0 g / by a size press or a tab size press, a blade coating, an air knife coating or the like. m ² or more, in particular allowed to contain or coating 2.2 g / m ² or more preferably.

As the polyethylene resin contained in the back resin layer (B), which is preferably used in the practice of the present invention, if the infrared dichroic ratio (D value) is 0.85 or less, Various polyethylene resins are useful,
From the viewpoint of improving curl properties and cuttability, those having an infrared dichroic ratio (D value) of 0.75 or less are more preferable,
It is particularly preferably 0.65 or less and 0.55 or more. When the infrared dichroic ratio (D value) is less than 0.55, the moldability of the resin composition for the back resin layer tends to deteriorate. The polyethylene resin for the back resin layer used in the practice of the present invention is JIS K 6760.
The melt flow rate specified in 10g / 10min-40g /
10 minutes, 90 to 65 parts by weight of high-density polyethylene resin having a density of 0.960 g / cm ³ or more and JIS K 67
The melt flow rate specified by 60 is 0.2 g / 10 min.
A compound resin composition in which 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 3 g / 10 minutes and a density of 0.935 g / cm ³ or less is melted and mixed in advance is preferable.

The high-density polyethylene resin for the backing resin layer, which is preferably used in the practice of the present invention, has a density of 0.960 g / cm ³ or more, and is JIS K 676.
Melt flow rate (hereinafter referred to as JIS K
The melt flow rate specified by 6760 is simply MFR
Is 10 g / 10 min to 40 g / 10 min, and the infrared dichroic ratio (D value) of the resin layer (B) is 0.85.
Various density, MFR, molecular weight, and molecular weight distribution can be used alone or in combination as long as they are as follows, and a normal high-density polyethylene resin, ethylene and propylene, and α-olefins such as butylene are used. Various kinds of copolymers such as copolymers and mixtures thereof can be used.

The MFR of the high-density polyethylene resin for the back resin layer which is preferably used in the practice of the present invention is in the range of 10 g / 10 minutes to 40 g / 10 minutes, particularly preferably 10 g / 10 minutes to 30 g. / 10 minutes range. M of the resin
If the FR is lower than 10 g / 10 min, the infrared dichroic ratio (D value) tends to be high, curling properties and cuttability tend to be poor, and the adhesiveness between the base paper and the resin layer, high-speed processability, etc. If it is higher than 40 g / 10 minutes, the mixing property of the resin, the molding processability and the like will be deteriorated. The density of the high-density polyethylene resin is 0.960 g / cm ³
If the density is lower than 0.960 g / cm ³ , there is a problem that the elastic modulus of the resin layer is low and the curl properties and stiffness are deteriorated, and it is preferably 0.962 g / cm ³ or higher.

The low-density polyethylene resin or the medium-density polyethylene resin for the back resin layer which is preferably used in the practice of the present invention has a density of 0.935 g / cm ³ or less, M
If the FR is in the range of 0.2 g / 10 min to 3 g / 10 min and the infrared dichroic ratio (D value) of the resin layer (B) is 0.85 or less, various Those having a density, MFR, molecular weight and molecular weight distribution can be used alone or in combination. For example, high-pressure low-density polyethylene resin (autoclave low-density polyethylene resin, tubular low-density polyethylene resin), linear low-density polyethylene resin, medium-density polyethylene resin, ethylene and propylene, butylene and other α-olefins Various materials such as polymers, carboxy-modified polyethylene resins and mixtures thereof can be used.

The MFR of the low-density polyethylene resin or the medium-density polyethylene resin for the back resin layer which is preferably used in the practice of the present invention is 0.2 g / 10 minutes to 3 g / 10.
If it is less than 0.2 g / 10 min, it is a problem that the mixing property of the resin, the adhesiveness between the base paper and the resin layer, the high-speed processability, etc. are deteriorated, and it is higher than 3 g / 10 min. When the molding processability is deteriorated and the infrared dichroic ratio (D value) is increased, curl properties and cutting properties tend to be poor, which is a problem, and more preferably 0.2 g / 10 min to 2 g / It is less than 10 minutes, particularly preferably in the range of 0.2 g / 10 minutes to less than 1 g / 10 minutes. The density of the low-density polyethylene resin or the medium-density polyethylene resin is 0.935 g / cm ³ or less, and the density is 0.
When it is higher than 935 g / cm ³ , the molding processability of the resin composition and the adhesiveness between the base paper and the resin layer are deteriorated, which is a problem, and preferably 0.930 g / cm ³ or less. As for the molecular weight distribution of the resin, the fraction having a molecular weight of 500,000 or more is 10% by weight.
The above is preferable, and 12% by weight or more is particularly preferable. The fraction of the resin having a molecular weight of 500,000 or more is 10% by weight.
If it is less, the moldability, especially neck-in, becomes large, which is not preferable. Here, the molecular weight is measured by Waters 150-C (column: Tosoh GMH-XL H).
T 8 mmφ × 30 cm × 3 lines, solvent: 1,2,4-trichlorobenzene, temperature: 135 ° C., flow rate: 1 ml / min).

The amount of the high-density polyethylene resin used in the compound resin composition comprising the high-density polyethylene resin and the low-density or medium-density polyethylene resin preferably used in the practice of the present invention is 90 to 65 parts by weight. And preferably in the range of 85 to 70 parts by weight. If the amount of the resin used is less than 65 parts by weight, the infrared dichroic ratio (D value) of the resin layer (B) becomes high and the curl properties, cuttability, stiffness, etc. of the support for image materials deteriorate. However, if the amount is more than 90 parts by weight, the mixing property of the resin, the moldability, the adhesiveness between the base paper and the resin layer, and the like are deteriorated, which is a problem.

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. When polyethylene resin is not used as a compound resin and directly added to the melt extrusion machine in the state of simple mixing and melt extrusion coating is performed, adhesion between the base paper and the resin layer, resin mixability, molding process It is a problem because the sex etc. deteriorates.

The side of the base paper of the support for image material of the present invention on which the image forming layer is provided is covered with a resin layer (A) containing a resin capable of forming a film. As the resin capable of forming a film, a thermoplastic resin such as a polyolefin resin, a polycarbonate resin, a polyester resin, a polyamide resin and a mixture thereof is preferable, and among them, the above-mentioned polyolefin resin is more preferable from the viewpoint of melt extrusion coating property, and a polyethylene resin is preferable. Resins are particularly preferred. Further, it may be covered with a resin layer made of an electron beam curable resin described or exemplified in JP-B-60-17104.

The polyethylene resin for the surface resin layer which is preferably used in the practice of the present invention includes low density polyethylene resin, medium density polyethylene resin, high density polyethylene resin, linear low density polyethylene resin, ethylene and propylene, butylene. Various kinds of copolymers such as α-olefins, carboxy-modified polyethylene resins and the like, and mixtures thereof can be used. Also, various density, MFR,
A molecular weight and a molecular weight distribution can be used, but usually, the density is 0.91 g / cm ^{3 to} 0.97 g / cm ³ , and the MFR is 1 g / 10.
Those having a molecular weight of 20,000 to 250,000 can be advantageously used alone or as a mixture.

The image material support in the present invention comprises a polyethylene resin composition for a back resin layer on a running base paper, and a resin in the front resin layer is a thermoplastic resin, preferably a polyolefin resin, and particularly preferably polyethylene. In the case of a system resin, the resin composition for the surface resin layer is produced by a so-called melt extrusion coating method, in which a resin composition for the surface resin layer is cast from the slit die into a film shape and coated. Usually, using a melt extruder on the running base paper, the resin composition melted from the slit die is extruded in a film form, cast and coated, pressure-bonded between the pressure roll and the cooling roll, It is produced in a series of steps of peeling from the cooling roll. At this time, the temperature of the molten film is preferably 280 ° C to 340 ° C.
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. Also,
It is preferable that the front and back resin layers are sequentially, preferably continuously, extrusion coated, that is, the base paper is coated by a so-called tandem extrusion coating method, and if necessary, two or more front or back resin layers are coated. In a multi-layer configuration,
You may coat by a multilayer extrusion coating method. The surface resin layer surface of the image material support has a glossy surface.
It can be processed to a fine rough surface, matte surface or silk surface described in JP-19732-A, and the back resin layer is usually preferably processed to a matte 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, preferably in the range of 8 μm to 40 μm. Further, it is preferable to reduce the coating amount of the back resin layer as compared with the front resin layer so that the difference in the resin coating amount between the front and back resin layers is 3 g / m ² or more.

Various additives may be incorporated in the front and back resin layers of the support for image materials of the present invention. Japanese Patent Publication No. 60-3430, Japanese Patent Publication No. 63-11655, 1-382
No. 91, Japanese Examined Patent Publication No. 1-38292, and titanium oxide, zinc oxide, talc described or exemplified in each publication 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 amines, phosphorus, various antioxidants such as sulfur, 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. The additives are preferably contained as a resin masterbatch or compound. In particular, as a method of 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 of the resin support of the image material of the present invention is subjected to activation treatment such as corona discharge treatment and flame treatment, and then, JP-A-61-84643 and 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 backing resin layer surface of the support for image materials in the present invention, various back layers are coated on the surface of the backing resin layer for the purpose of preventing electrification after the activation treatment such as corona discharge treatment and flame treatment. can do. Further, in the back layer, inorganic antistatic agents such as colloidal silica, colloidal alumina, hectorite clay colloids and mixtures thereof described or exemplified in JP-A-5-107688, binders, organic antistatic agents or both. JP-A-59-214 for the purpose of
A water-soluble synthetic polymer compound or a salt thereof having a carboxyl group or a sulfone group described or exemplified in 849 publication, a hydrophilic synthetic polymer colloid substance or a salt thereof, a polymer described or exemplified in JP-A-59-214849 Latex, starch described or exemplified in JP-A-58-14131, polyvinylpyrrolidone described or illustrated in JP-A-58-45248, polyvinyl alcohol described or illustrated in JP-A-62-220950, Kaisho 63-1
Polymers such as chitosan described or exemplified in 89859, curing agents described or exemplified in JP-B-58-56859, matting agents or surfactants described or exemplified in JP-A-59-21849. It may be contained in an appropriate combination.

As a device 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,
Examples thereof include a gravure coater, a flexo gravure coater and a combination thereof. Further, as a drying device for the applied coating liquid, there are various types such as a straight 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 dryer using a microwave or the like. A drying device can be mentioned.

In the present invention, a back layer is provided on the back resin layer (B) side, and a cut-off value of 0.8 mm measured using a stylus type three-dimensional surface roughness meter on the back layer surface is used. The square value of the center surface average roughness (SRa) in the papermaking direction is 0.85μ.
m ² ~2.0μm ^2, preferably 1.0μm by a ^{2 ~1.7μm 2,} cleavage of the image material, in particular significantly can improve the accuracy of the cut dimension. To center plane average roughness of the back layer surface of the image material support in the present invention the squared value (SRa) to 0.85μm ² ~2.0μm ² is, specifically, melt extrusion coating the back resin layer At this time, a cooling roll having a roughness so that the square value of SRa of the back layer surface is in the above range is used. The mat selected in the back layer so that the square value of SRa of the back layer surface is in the above range. A proper amount of an agent, for example, silica particles having a selected particle size, aluminum hydroxide particles, etc.,
The square value of SRa of the back layer surface is controlled to be within the above range by utilizing the interaction of the back layer components, particularly the cohesive action (the interaction between the inorganic antistatic agent and the latex or the organic water-soluble polymer compound is effective. Method) and the like. Among these methods, the use of a cooling roll having a designed roughness is particularly effective. As the cooling roll having a surface roughness, it is useful to use a sandblast method, an etching method, an electric perforation method, a liquid honing method or the like to form a rough surface having irregularities. Those are preferable. As the material of the cooling roll, stainless steel, nickel or chrome plating such as iron,
Various things such as enameling can be used.

The support for the image material in the present invention is coated with various photographic constituent layers, for color photographic printing paper, black and white photographic printing paper, typesetting photographic paper, copy photographic paper, reverse photographic material, The silver salt diffusion transfer method can be used for various applications such as negative and positive, and printing materials. For example, silver chloride, silver bromide, silver chlorobromide, silver iodobromide, and silver chloroiodobromide emulsion layers 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. , Hardener, formalin, vinyl sulfone compound, aziridine compound, etc., coating aid, alkylbenzene sulfonate, sulfosuccinic acid ester salt, etc., anti-fouling agent, dialkyl hydroquinone compound, etc., fluorescent brightening agent, sharpness improvement Dye, antistatic agent, pH adjusting agent,
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 exposed, developed and stopped as described in "Photosensitive Material and Handling Method" (Kyoritsu Shuppan, Goro Miyamoto, Photo Technology Course 2) according to the photographic material. , Fixing, bleaching, stabilizing, etc. can be performed. Further, the multi-layer silver halide color photographic material may be treated with a developer containing a development accelerator such as benzyl alcohol, thallium salt, phenidone or the like, or may be treated with a developer substantially free of benzyl alcohol. it can.

The image material support of the present invention may be coated with various types of thermal transfer recording image receiving layers to be used as various thermal transfer recording image receiving material supports. As the synthetic resin used for the thermal transfer recording image-receiving layer, a resin having an ester bond such as polyester resin, polyacrylic ester resin, polycarbonate resin, polyvinyl acetate resin, polyvinyl butyral resin, styrene acrylate resin, and vinyltoluene acrylate resin. , Resins having urethane bonds such as polyurethane resins, resins having amide bonds such as polyamide resins, resins having urea bonds such as urea resins, other polycaprolactam resins, styrene resins, polyvinyl chloride resins, vinyl chloride-vinyl acetate Examples thereof include copolymer resins and polyacrylonitrile resins. In addition to these resins, mixtures or copolymers thereof can be used.

In the thermal transfer recording image-receiving layer according to the present invention,
In addition to the above synthetic resin, a release agent, a pigment or the like may be added. Examples of the releasing agent include solid waxes such as polyethylene wax, amide wax, and Teflon powder, fluorine-based waxes,
Examples thereof include phosphate ester type surfactants and silicone oils. 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 wt% to 20 wt% in the image receiving layer. As the pigment, extender pigments 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 image material support of the present invention may be coated with various ink receiving layers and used as various ink jet recording material supports. Various binders may be contained in these ink receiving layers for the purpose of improving the drying property of the ink and the sharpness of the image. Specific examples of these binders include lime-processed gelatin, acid-processed gelatin, enzyme-processed gelatin, gelatin derivatives, and various gelatins such as gelatin reacted with an anhydride of a dibasic acid such as phthalic acid, maleic acid and fumaric acid. , Ordinary polyvinyl alcohol with various degrees of saponification,
Carboxy-modified, cation-modified and amphoteric polyvinyl alcohols and their derivatives, starches such as oxidized starch, cationized starch and etherified starch, cellulose derivatives such as carboxymethyl cellulose and hydroxyethyl cellulose, polyvinylpyrrolidone, polyvinylpyridinium halide, polyacryl Acid soda, acrylic acid methacrylic acid copolymer salt, polyethylene glycol, polypropylene glycol, polyvinyl ether, alkyl vinyl ether / maleic anhydride copolymer, styrene / maleic anhydride copolymer and salts thereof, synthetic polymers such as polyethyleneimine Conjugated diene copolymer latex such as styrene / butadiene copolymer, methyl methacrylate / butadiene copolymer, polyvinyl acetate, vinyl acetate /
Vinyl acetate polymer latex such as maleic acid ester copolymer, vinyl acetate / acrylic acid ester copolymer, 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 / acrylic acid ester copolymer, vinylidene chloride copolymer latex, etc. or a functional group-containing unit such as carboxyl group of these various polymers Functional group-modified polymer latex by body, water-based adhesive such as thermosetting synthetic resin system such as melamine resin, urea resin and polymethylmethacrylate, polyurethane resin, unsaturated polyester resin, vinyl chloride / vinyl acetate copolymer, polyvinyl butyral, Synthetic resin adhesive such as alkyd resin, Japanese Patent Publication No. 3-24906 No. 3-281383, Japanese Patent Application No. 4-2
Examples thereof include inorganic binders such as alumina sol and silica sol described or exemplified in each publication such as 40725, and these may be contained alone or in combination.

The ink 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, an anionic surfactant such as a long-chain alkyl benzene sulfonate, a long-chain, preferably a branched alkyl sulfosuccinate, a polyalkylene oxide of a long-chain, preferably a branched alkyl group-containing phenol. 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,
As hardeners and preservatives such as acryloyl compounds and isocyanate compounds, P-hydroxybenzoic acid ester compounds, benzisothiazolone compounds, isothiazolone compounds, etc. described or exemplified in JP-A-1-102551, JP-A-63-204251 , Color pigments described in each publication such as JP-A 1-266537 or exemplified, coloring dyes, optical brighteners, etc.,
As an anti-yellowing agent, sodium hydroxymethanesulfonate, sodium P-toluenesulfinate, etc., as an ultraviolet absorber, a benzotriazole compound having a hydroxy-di-alkylphenyl group at the 2-position, an antioxidant, and the like. As a pencil writing agent such as a polyhindered phenol compound described or exemplified in 105245, starch particles, barium sulfate, silicon dioxide or other organic or inorganic fine particles having a particle diameter of 0.2 μm to 5 μm, Japanese Patent Publication No. 4-1337. Organopolysiloxane compounds described or exemplified in the publication, etc., as a pH adjuster, various additives such as caustic soda, sodium carbonate, sulfuric acid, hydrochloric acid, phosphoric acid, citric acid, etc., octyl alcohol, silicon antifoaming agents, etc. are appropriately combined. Can be included.

[0063]

EXAMPLES In order to describe the present invention more specifically,
Examples will be described.

Example 1 (Base paper A) Fiber length of pulp after beating hardwood bleached kraft pulp (JAPANTAPPI paper pulp test method No. 5)
2-89 “Paper and pulp fiber length test method” is 0.61 mm (in terms of length weighted average fiber length), and Canadian Standard Freeness is 3
After beating to 20 ml, 3 parts by weight of cationized starch, 0.2 parts by weight of anionized polyacrylamide, 0.4 parts by weight of emulsion of alkyl ketene dimer (as ketene dimer content), relative to 100 parts by weight of pulp, 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 optical brightener, blue dye and red dye were added to prepare a stock slurry.
After that, the stock slurry is placed on a Fourdrinier paper machine running at 200 m / min to form a web while giving an appropriate turbulence, and the linear pressure in the wet part is in the range of 15 kg / cm to 100 kg / cm. After performing the adjusted three-stage wet press, it is treated with a smoothing roll, and in the subsequent drying part, after performing the two-stage tightness press in which the linear pressure is adjusted in the range of 30 kg / cm to 70 kg / cm, Dried. Then, in the middle of drying, 4 parts by weight of carboxy-modified polyvinyl alcohol, 0.05 part by weight of optical brightener, 0.002 part by weight of blue dye,
A size press liquid consisting of 4 parts by weight of sodium chloride and 92 parts by weight of water was pressed at 25 g / m ² size and dried so that the moisture content of the base paper finally obtained was 8% by weight,
Machine calendered at a linear pressure of 70 kg / cm, the basis weight is 1
A base paper A having a density of 70 g / m ² and a density of 1.04 g / cm ³ was produced.

(Base paper B) Fiber length of pulp after beating hardwood bleached kraft pulp instead of the stock slurry used in base paper A (JAPAN TAPPI paper pulp test method N
o.52-89 (indicated by length weighted average fiber length measured in accordance with “Paper and Pulp Fiber Length Test Method”) is 0.59 mm, and Canadian Standard Freeness is 310 ml. After beating, for 100 parts by weight of pulp, 2.5 parts by weight of cationized starch, 0.2 parts by weight of anionized polyacrylamide, 0.4 parts by weight of emulsion of alkyl ketene dimer (as ketene dimer content), epoxidized higher grade Same as base paper A except that 0.2 parts by weight of fatty acid amide, 0.4 parts by weight of polyamide epichlorohydrin resin, and an appropriate amount of optical brightener, blue dye, and red dye are used to prepare a stock slurry. The basis weight is 170
A base paper B having a g / m ² and a density of 1.04 g / cm ³ was produced.

(Base paper C) Fiber length of pulp after beating hardwood bleached kraft pulp instead of the stock slurry used in base paper A (JAPAN TAPPI paper pulp test method N
o.52-89 (indicated by the length-weighted average fiber length measured in accordance with "Paper and Pulp Fiber Length Test Method") is 0.56 mm, and the Canadian Standard Freeness is 295 ml. After beating, per 100 parts by weight of pulp, 2.3 parts by weight of cationized starch, 0.2 part by weight of anionized polyacrylamide, 0.4 part by weight of emulsion of alkyl ketene dimer (as ketene dimer content), epoxidized higher grade Same as base paper A except that 0.2 parts by weight of fatty acid amide, 0.4 parts by weight of polyamide epichlorohydrin resin, and an appropriate amount of fluorescent whitening agent, blue dye, and red dye are used to prepare a stock slurry. The basis weight is 170
A base paper C having a g / m ² and a density of 1.06 g / cm ³ was produced.

(Base paper D) Instead of the stock slurry used in the base paper A, fiber length of pulp after beating hardwood bleached kraft pulp (JAPAN TAPPI paper pulp test method N
o.52-89 (indicated by length-weighted average fiber length measured according to "Paper and Pulp Fiber Length Test Method") is 0.59 mm, and Canadian Standard Freeness is 310 ml. After beating, per 100 parts by weight of pulp, 3.6 parts by weight of cationized starch, 0.2 parts by weight of anionized polyacrylamide, 0.4 parts by weight of alkyl ketene dimer emulsion (as ketene dimer content), epoxidized higher grade Same as base paper A except that 0.2 parts by weight of fatty acid amide, 0.4 parts by weight of polyamide epichlorohydrin resin, and an appropriate amount of fluorescent whitening agent, blue dye, and red dye are used to prepare a stock slurry. The basis weight is 170
A base paper D having a g / m ² and a density of 1.06 g / cm ³ was produced.

(Base paper E) Instead of the stock slurry used in the base paper A, a fiber length of pulp after beating a mixed pulp composed of 80% by weight of hardwood bleached kraft pulp and 20% by weight of hardwood bleached sulfite pulp ( JAPAN TAPP
I paper pulp test method No. 52-89 "Paper and pulp fiber length test method" measured in accordance with length weighted average fiber length) was 0.56 mm, and Canadian Standard Freeness was After beating to 295 ml, based on 100 parts by weight of pulp, 3 parts by weight of cationized starch, 0.2 part by weight of anionized polyacrylamide, 0.2 part by weight of epoxidized higher fatty acid amide, and emulsion of alkyl ketene dimer ( 0.4 parts by weight (as ketene dimer content), 0.4 parts by weight of polyamide epichlorohydrin resin, and an appropriate amount of optical brightener, blue dye, and red dye are used to prepare a stock slurry. In the same way as
Base paper E having a basis weight of 170 g / m ² and a density of 1.06 g / cm ^3.
Was manufactured.

(Base paper F) Instead of the stock slurry used in the base paper A, the fiber length of pulp after beating hardwood bleached kraft pulp (JAPAN TAPPI paper pulp test method N
o.52-89 (measured in accordance with “Paper and Pulp Fiber Length Test Method”) to be 0.51 mm (in terms of length-weighted average fiber length) and Canadian Standard Freeness of 270 ml. After beating, 0.6 parts by weight of polyaluminum hydroxide (as solid content), 1.5 parts by weight of cationized starch, 0.2 parts by weight of anionized polyacrylamide, and 100 parts by weight of sodium stearate per 100 parts by weight of pulp. 5 parts by weight, 0.1 parts by weight of epoxidized higher fatty acid amide, 0.4 parts by weight of polyamide epichlorohydrin resin and a stock slurry prepared by adding an appropriate amount of optical brightener, blue dye and red dye, and The basis weight was 17 in the same manner as in the base paper A except that 4 parts by weight of calcium chloride was used instead of 4 parts by weight of sodium chloride in the size press liquid.
A base paper F having a density of 0 g / m ² and a density of 1.06 g / cm ³ was produced.

These base papers A to F have a film pressure unevenness index RP.
The y was in the range of 200 mV to 210 mV, and the center side average roughness SRa on the front side was in the range of 1.1 μm to 1.2 μm.

Next, after the base paper surface (rear surface) opposite to the side on which the image forming layer is provided is subjected to corona discharge treatment, the resin composition (R1) or (R2) described below is applied to the rear surface at a resin temperature of 315.
Melt extrusion coating was performed at 20 ° C. at a resin thickness of 20 μm at a running speed of the base paper of 200 m / min. At this time, as the cooling roll, the square value of the center surface average roughness (SRa) of the back layer surface after coating the following back layer was 0.75 μm ² or 1.
A surface roughness of 4 μm ² was used. 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 = 6.8 g / 10 min) 6
5 parts by weight and low density polyethylene resin (density 0.926 g
/ Cm ³ , MFR = 3.5 g / 10 min) and 35 parts by weight of the resin composition were simply mixed, and the resin composition was used by simply adding it to the melt extruder.

(Resin Composition R2) 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 0.924 g / c
m ³ and MFR = 0.6 g / 10 min) 30 parts by weight was a compound resin composition prepared by melting and mixing in advance using a melt extruder, and was used as the pellet.

Subsequently, the surface of the base paper was subjected to a corona discharge treatment, and then a low density polyethylene resin (having a density of 0.92) was formed on the surface.
0 g / cm ³ , MFR = 8.5 g / 10 min) 47.5% by weight, hydrous aluminum oxide (against titanium dioxide to Al ₂ O ₃
50% by weight of anatase type titanium dioxide pigment surface-treated with 0.75% by weight) and 2.5% of zinc stearate.
20% by weight of a masterbatch of titanium dioxide pigment
Parts by weight, low-density polyethylene resin (density 0.920 g / c
m ^3, MFR = 4.5g / 10 min) 65 parts by weight of a high density polyethylene resin (density ^{0.970g / cm 3, MFR = 7.0g} /
10 minutes) The resin composition consisting of 15 parts by weight is added to the resin temperature 315
The composition was melt-extruded to a thickness of 28 μm at 200 ° C. at a running speed of the base paper of 200 m / min. The melt extrusion coating of the front and back polyethylene resins was performed by a so-called tandem method in which extrusion coating was sequentially performed. 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 the front and back resin layers are processed and before being wound up, after the corona discharge treatment on the back resin layer surface of the resin-coated paper,
The following coating solution for the back layer was applied on-machine. As dry weight, colloidal silica: styrene latex =
The coating solution for the back layer, which is composed of 1: 1 and further contains 0.021 g / m ² of sodium polystyrene sulfonate and an appropriate amount of a coating aid and the like, has a latex content (calculated by solid weight) of 0.21.
The coating amount was g / m ² . In addition, in order to separately measure the infrared dichroic ratio (D value) of the back resin layer, a sample without a back layer was also prepared.

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

Next, a blue-sensitive emulsion layer containing a yellow color-forming coupler, an intermediate layer containing a color mixing inhibitor, a green-sensitive emulsion layer containing a magenta color-forming coupler, and an ultraviolet absorber were formed on the undercoat layer of the support for image materials. The total amount of gelatin is 8g / g by providing an ultraviolet absorbing layer containing, a red-sensitive emulsion layer containing a cyan color forming coupler and a protective layer.
I made a color photographic paper that is m ² . Each color-sensitive emulsion layer contains silver chlorobromide equivalent to 0.6 g / m ² in terms of silver nitrate. In addition to gelatin necessary for the production, dispersion and film formation of silver halide, an appropriate amount of antifoggant and sensitizing dye. , Coating aids, hardeners, thickeners and appropriate amounts of filter dyes and the like. The thickness of each color photographic paper is 21
It was in the range of 7 μm to 220 μm. Next, the prepared color printing paper was stored at 35 ° C. and normal humidity for 5 days, and after color development, 8.2 cm × 1 at 20 ° C. and 40% RH.
The curl state of a color print having a size of 1.7 cm was evaluated. As evaluation criteria, grades 7 to 6; slightly negative curl (curl toward back layer side) and extremely flat,
Good curl properties, grade 5-4; curl,
There is no problem in practical use, grade 3 to 2; curl is large, but it is at a practical limit to some extent, grade 1; curl is extremely large, and there is a problem in practical use.

As a method for evaluating the cuttability of the image material, the above roll-shaped color photographic paper having a width of 8.2 cm is used and the blade width is 90
It cut | disconnected so that the length direction might become the size of 11.7 cm with the precision print cutter set to (micrometer), and evaluated the state of the cut surface. As evaluation criteria, grade 10
9: The cutting rate with a cutter is 100%, and the cutting performance is very good with almost no beards generated from the cutting surface. Grades 8 to 7; The cutting rate with a cutter is 100%, and the beard from the cutting surface There is little occurrence of
Grades 6 to 5; Cutting rate with a cutter is 100%, whiskers are generated from the cut surface, but there is no practical problem, Grade 4 to 3; Cutting rate with a cutter is 50 to
60%, 100 if the blade width is not reduced by 10 to 15 μm
% Cutting rate is not a practical problem, or the cutting rate is 100%, but whiskers are very often generated from the cut surface, which is a practical problem, grade 2 to 1; cutting with a cutter 0% (hence 100% failure rate)
Therefore, unless the blade width is reduced by 20 μm or more, the cutting rate does not reach 100%, and in that case too much beard is generated from the cut surface, which represents a practical problem.

As a method of evaluating the cutting accuracy of the image material,
The length of the cut sample was measured and evaluated. As the evaluation criteria, grades 10 to 9; cutting dimension is 0 to less than 0.1 mm and cutting accuracy is very good, grade 8 to 7; cutting dimension is 0.1 to less than 0.2 mm, cutting accuracy is Good,
Grade 6 to 5; cutting dimension is less than 0.2 to 0.5 mm and cutting accuracy is practically no problem. Grade 4 to 3; cutting dimension is 0.5 mm or more, cutting accuracy is practically problematic to some extent. Grades 2 to 1; to the extent that cutting accuracy cannot be discussed in the first place without cutting.

The obtained results are shown in Table 1.

[0081]

[Table 1]

Note that (Note 1) to (Note 5) in Table 1 are as follows.

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

(Note 2) to (Note 3) Internal bond strength (gf · cm) of the image material measured by the method described in the specification.
/ Cm ² ) and tear strength (gf).

(Note 4) The cutability index (C value) of the image material specified in the text of the specification is shown.

(Note 5) The infrared dichroic ratio (D value) of the back resin layer measured by the method described in the specification is shown for the sample having no back layer.

From the results in Table 1, the image material support (samples No. 2 to No. 6 and No. 8 to No.) in the present invention in which the cutting property index (C value) of the image material is 1.3 or more. 12, No.14
It can be clearly seen that Nos. 15 to 17 and Nos. 17 to 18) are excellent image material supports having good cutting properties, cutting precision and curl properties of the image material. In particular, in view of the cutting property and cutting accuracy of the image material, the image material support having a cutting index (C value) of 1.4 or more (Sample No. 3 to No. 6, No. 9). ~ No.12, No.14 ~ No.1
No. 5 and No. 17 to No. 18) are preferable, and a support for imaging materials (Sample No. 5 to No. 6, No. 11 to No. 5) that is 1.5 or more.
It is well understood that No. 12, No. 15 and No. 18) are particularly preferable.

From the viewpoint of cutting accuracy and cutting property of the image material, the square value of the surface roughness (SRa) of the back layer surface is 0.
85μm image material support is preferably ^{2 ~2.0μm 2,} further in view of the curl properties of the image material, image material infrared dichroic ratio of the back resin layer (D value) of 0.75 or less It will be appreciated that supports are preferred.

On the other hand, a support for an image material other than the present invention (Sample N in which the cutting index (C value) of the image material is less than 1.3)
Nos. 1, No. 7, No. 13, and No. 18) clearly show that the cutting property of the image material is poor, which is a problem.

Example 2 Instead of the base paper of Sample No. 4 of Example 1, the following base paper G to
Same as Sample No. 4 of Example 1 except that N is used and the thickness of the front resin layer and the back resin layer is set to the thickness shown in Table 2 and thus the thickness of the image material is set to the thickness shown in Table 2. It was carried out.

(Base paper G) A base paper having a thickness of 142 μm and a density of 1.04 g / cm ³ manufactured in the same manner as the base paper B. (Base paper H) The thickness produced in the same manner as the base paper B is 147μ.
m, a base paper having a density of 1.04 g / cm ³ . (Base paper I) Thickness produced in the same manner as base paper D is 150 μ
m, a base paper having a density of 1.06 g / cm ³ . (Base paper J) Thickness produced in the same manner as base paper D is 160 μ
m, a base paper having a density of 1.06 g / cm ³ . (Base paper K) Thickness produced in the same manner as base paper E is 171μ
m, a base paper having a density of 1.06 g / cm ³ . (Base paper L) Thickness produced in the same manner as base paper E is 175 μ
m, a base paper having a density of 1.06 g / cm ³ . (Base paper M) The thickness produced in the same manner as the base paper E is 181 μ.
m, a base paper having a density of 1.06 g / cm ³ . (Base paper N) The thickness produced in the same manner as the base paper E is 184μ.
m, a base paper having a density of 1.06 g / cm ³ .

The results obtained are shown in Table 2. The infrared dichroic ratio (D value) of the back resin of each obtained sample was 0.62 to
The surface roughness (SR) of the back layer surface is in the range of 0.64.
square value of a) ranged from 1.38μm ² ~1.43μm ^2.

[0093]

[Table 2]

Note that (Note 1) to (Note 4) have the same meanings as those in Table 1.

From the results shown in Table 2, the thickness of the image material was 195.
The image material support (samples No. 20 to No. 26) of the present invention, which has a cuttability index (C value) of 1.3 or more and a thickness of μm to 250 μm, has a synergistic effect. It can be clearly seen that the support for an image material is excellent in the cuttability of the image material, the cutting accuracy and the curl physical properties. In particular, from the viewpoint of cutting property and cutting accuracy of the image material, the thickness of the image material is 205 μm to 235 μm.
Image material support (sample No. 21 to No. 2)
It is clear that 4) is preferable. On the other hand, the thickness when used as an image material is less than 195 μm or 250 μm
It can be clearly understood that the image material supports (Samples No. 19 and No. 27) other than the present invention, which have a larger thickness, have a problem that the cutting property and the cutting accuracy of the image material are poor.

Example 3 Sample No. 1 of Example 1 was replaced by the following resin compositions (R1) to (R6) in place of the resin composition (R2) used in Sample No. 4 of Example 1. It carried out similarly to 4.

(Resin Composition R1) The same as the resin composition (R1) used in Example 1. (Resin composition R2) The resin composition (R
Same as 2).

(Resin Composition R3) High Density Polyethylene Resin (Density 0.967 g / cm ³ , MFR = 6.5 g / 10 min) 5
0 parts by weight and low density polyethylene resin (density 0.926 g
/ Cm ³ , MFR = 3.5 g / 10 minutes) 50 parts by weight, which is a resin composition simply mixed and used by adding it to a melt extruder as it is.

(Resin Composition R4) High Density Polyethylene Resin (Density 0.967 g / cm ³ , MFR = 10 g / 10 min) 65
Parts by weight and low density polyethylene resin (density 0.926 g / c
m ³ and MFR = 0.6 g / 10 minutes) 35 parts by weight was a compound resin composition prepared by melting and mixing in advance using a melt extruder and used as pellets.

(Resin Composition R5) High Density Polyethylene Resin (Density 0.967 g / cm ³ , MFR = 10 g / 10 min) 78
Parts by weight and low density polyethylene resin (density 0.926 g / c
m ³ and MFR = 0.6 g / 10 min) 22 parts by weight was a compound resin composition prepared by melting and mixing in advance using a melt extruder and used as pellets.

(Resin Composition R6) High Density Polyethylene Resin (Density 0.967 g / cm ³ , MFR = 15 g / 10 min) 85
Parts by weight and low density polyethylene resin (density 0.926 g / c
m ³ and MFR = 0.6 g / 10 minutes) 15 parts by weight, which was a compound resin composition prepared by previously melting and mixing with a melt extruder, and used as pellets.

The results obtained are shown in Table 3. Incidentally, the square value of the surface roughness of the back layer surface of each sample obtained (SRa) was in the range of 1.38μm ² ~1.43μm ^2.

[0103]

[Table 3]

Note that in Table 3, (Note 1) and (Note 4)-
(Note 5) has the same meaning as those in Table 1.

From the results shown in Table 3, the image material supports (Sample Nos. 29 to 33) in which the infrared dichroic ratio (D value) of the back resin layer was 0.85 or less were It can be clearly seen that the support for image materials is excellent in cutting property and cutting accuracy and curling physical properties. Also,
In the case of using the resin composition (R6), the neck-in during the production of the resin-coated paper was large and the moldability was somewhat insufficient. From the viewpoint of molding processability and overall performance of the image material, it is well understood that the support for image material in which the infrared dichroic ratio (D value) of the back resin layer is 0.85 or less and 0.55 or more is particularly preferable. .

Example 4 In the sample No. 4 of Example 1, the square value of the center surface average roughness (SRa) of the back layer surface after coating the back layer is shown in Table 4.
Other than using the cooling roll having the roughness described in the above,
It carried out like sample No. 4 of Example 1.

The results obtained are shown in Table 4. The cutting index (C value) of the obtained sample was in the range of 1.44 to 1.45, and the infrared dichroic ratio (D value) of the back resin layer was 0.62.
The range was 0.64.

[0108]

[Table 4]

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

[0110] From the results of Table 4, the image material support square value is 0.85μm ² ~2.0μm ² of the surface roughness of the back layer surface (SRa) (Sample Nanba35～nanba39) is It can be clearly seen that the support for an image material is excellent in that the cutting accuracy of the image material is good and the curl properties are good. Further, from the viewpoint of the cutting property and cutting accuracy of the support for image material, the square value of the surface roughness (SRa) of the back layer surface is
Image material support is 1.0μm ² ~1.7μm ² (Sample
It is well understood that No. 36 to No. 38) are particularly preferable.

Example 5 An inkjet image-receiving material was prepared by coating the following inkjet image-receiving layer instead of the multilayer silver halide color photographic constituent layer used in Sample No. 4 of Example 1. as a result,
The cutability index (C value) of the inkjet image receiving material is 1.
44, the infrared dichroic ratio (D value) of the back resin layer is 0.63, the square value of the surface roughness (SRa) of the back layer surface is 1.4 μm ² , and the cutting property, cutting accuracy and curl physical properties are good. And was excellent as a support for image materials.

The ink jet image receiving layer is composed of a 10% by weight aqueous gelatin solution of alkali-processed gelatin having a molecular weight of 70,000.
g, 37.5 g of an 8 wt% aqueous solution of sodium carboxymethyl rose (etherification degree: 0.7 to 0.8, viscosity of a 2 wt% aqueous solution with a B type viscometer is 5 cp or less), an epoxy compound (Nagase 5 of NER-010) manufactured by Sangyo Co., Ltd.
0.3% by weight methanol solution, sulphosuccinic acid-2
A coating liquid consisting of 0.5 g of a 5% by weight mixture of methanol and water of ethylhexyl ester salt and 31.7 g of pure water was applied to form a solid content of 7 g / cm ² and formed.

[0113]

EFFECTS OF THE INVENTION According to the present invention, an excellent resin-coated paper using a paper as a substrate, which can provide an image material having good cuttability, an accurate cut dimension, and good curl properties and a print thereof, can be provided. A support for a mold image material can be provided.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location G03C 1/81 B41M 5/26 101H

Claims (11)

[Claims] 1. A paper having natural pulp as a main component is used as a substrate, and one of the paper substrates on which an image forming layer is provided is covered with a resin layer (A) containing a resin capable of forming a film, and the other side of the paper substrate is covered. A support for an image material, the paper substrate of which is coated with a resin layer (B) containing a polyethylene-based resin, and the thickness of the image material having the support for the image material is 195 μm to 2
A support for image materials, which has a cuttability index (C value) represented by the number 1 of the image material of 1.3 or more. [Equation 1] The internal bond strength and tear strength are the internal bond strength (gf · cm / cm ² ) and tear strength (gf) of the image material defined below. Internal bond strength: The internal bond strength of the image material determined in the papermaking direction of the paper substrate according to Japan TAPPI Paper Pulp Test Method No. 54-93. The strength obtained by the same test method is 2.54 cm
Since the strength per unit area (kgf · cm) is × 2.54 cm, the value converted per unit area (cm ² ). Specifically, it is converted into a unit of gf · cm / cm ² by multiplying 155 by the internal bond strength (kgf · cm) obtained by the same test method. Tear strength: The force (gf) required to tear one image material, which is determined according to JIS P 8116. 2. The support for image materials according to claim 1, which has a cuttability index (C value) of 1.4 or more. 3. The support for image materials according to claim 1, which has a cuttability index (C value) of 1.5 or more. 4. A resin layer (B) containing a polyethylene resin.
A back layer is coated on the side, and the center plane average roughness (SRa) in the paper-making direction at the cut-off value of 0.8 mm measured using a stylus type three-dimensional surface roughness meter on the back layer surface. claim 1, 2 or 3 images material support according squared value is 0.85μm ² ~2.0μm ^2. 5. The center plane average roughness (SRa) image material support according to claim 4, wherein the square value is 1.0μm ² ~1.7μm ² of. 6. A resin layer (B) containing a polyethylene resin
Has an infrared dichroic ratio (D value) defined below of 0.85
The support for an image material according to claim 1, which is as follows. Infrared dichroic ratio (D value): The resin layer (B) coated on the side opposite to the side on which the image forming layer is provided without the back layer is coated on a paper substrate with an aqueous solution of sodium hypochlorite. detached from, the film peeled infrared absorption spectrum was measured with infrared light that is polarized by the polarizing plate, 720 cm ^-1 before and after the 730 cm ^-1 in the two front and rear derived from rocking vibration of CH ₂ of polyethylene molecules 720 cm in the infrared absorption peak
^-Calculate the peak intensity around ^-1 . This peak intensity is
Is the value of the obtained absorbance as the baseline the small dots and a line connecting the most absorbance in the 725cm ^-1 ~775cm ^-1 with small point of highest absorbance in the 675cm ^-1 ~725cm ^-1. At this time, the peak intensity A (=) around 720 cm ⁻¹ by infrared light polarized parallel to the running direction (longitudinal direction) at the time of melt extrusion and the infrared light polarized vertically The peak intensity A (+) around 720 cm ^-1 is determined, and the ratio of A (=) / A (+) is defined as the infrared dichroic ratio (D value). 7. The support for image materials according to claim 6, which has an infrared dichroic ratio (D value) of 0.75 or less. 8. The support for image materials according to claim 6, which has an infrared dichroic ratio (D value) of 0.65 or less. 9. A support for an image material according to claim 1, wherein the resin capable of forming a film in the resin layer (A) is a polyolefin resin or a polyester resin. body. 10. The support for image materials according to claim 9, wherein the polyolefin resin is a polyethylene resin. 11. The resin layer (A) contains a titanium dioxide pigment, 1, 2, 3, 4, 5, 6, 7,
The support for image material according to 8, 9, or 10.