JPH08201967A - Support for imaging materials - Google Patents

Abstract

(57) [Summary] [Purpose] The occurrence of peeling unevenness during manufacturing is significantly improved,
The appearance of the image material is high, the image forming layer has a good filming property, the molding processability is good, and stable production is possible.
Provide excellent support for resin-coated paper type image material. A polyethylene resin in a resin composition comprising 50 to 95% by weight of a polyethylene resin produced using a metallocene catalyst and 50 to 5% by weight of a polyethylene resin having a long chain branch produced by a high pressure method. Mainly polyethylene resin characterized by having a melting point (unit: ° C) and a density (unit: g / cm ³ ) represented by the formulas (1) and (2) and having Mw / Mn of 4 or more. A support for an image material in which a base paper surface on a side where an image forming layer is provided is covered with a resin layer composed of a resin composition as a component. Melting point ≧ 901 × Density-720 Formula (1) Melting point ≦ 901 × Density-711 Formula (2)

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention In the present invention, paper is used as a substrate, and the paper substrate (hereinafter sometimes abbreviated as base paper) on the side on which one of the image forming layers is provided has a polyethylene resin as a main component. The present invention relates to a resin-coated paper-type image material support coated with a resin layer made of a resin composition, and more specifically, the occurrence of peeling unevenness is remarkably suppressed, and film-forming property of the image-forming layer with the support is provided. The present invention relates to a resin-coated support for paper-type image material, which has good molding processability of the resin composition and can be stably produced at high speed.

[0002]

2. Description of the Related Art Conventionally, a resin-coated paper type support having a base paper surface coated with a polyethylene resin for use in image materials is well known. For example, in Japanese Examined Patent Publication No. 55-12584,
A technique is disclosed for a photographic support whose base paper is coated with a film-forming resin, preferably a polyolefin resin. U.S. Pat. No. 3,501,298 discloses a technique for a photographic support in which both sides of a base paper are coated with a polyolefin resin. Since the rapid photographic processing method for silver halide photographic light-sensitive materials was applied,
A photographic support in which both sides of a base paper are coated with a polyethylene resin has been mainly put into practical use for photographic printing paper, and if necessary, the sharpness may be included in the resin layer on one side of the image forming layer. The titanium dioxide pigment is usually contained in order to impart.

Further, US Pat. No. 4,774,224 discloses that
A thermal transfer recording image-receiving element has been proposed which has as a support a resin-coated paper having a surface roughness of the resin coating 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,
63-307979 discloses a technique relating to an inkjet recording sheet having a resin-coated paper as a support.

However, the resin-coated support for paper-type image material in which at least one surface of the base paper is coated with a polyethylene resin still has serious problems in terms of production and quality.

That is, first, the polyethylene-based resin-coated paper is formed by casting a polyethylene-based resin composition in a film form from its slit die on a base paper which is normally running, using a melt extrusion machine, and applying the melted extruder. It is produced by a series of processes in which the pressure roll and the cooling roll are pressure-bonded to each other, and after cooling, they are separated from the roll. However, with conventional polyethylene-based resin-coated paper, the higher the production rate, the worse the releasability of the polyethylene-based resin-coated paper from the chill roll, and the lateral width in the width direction called peeling unevenness on the resin-coated paper surface. There is a problem in that stepwise unevenness occurs. The production of polyethylene-based resin-coated paper is carried out by operating the melt extruder continuously for at least 2-3 days, usually for a week, and sometimes for a month from the start of operation, but the period of continuous operation is The longer the length, the poorer the cleaning, and the more frequent the peeling unevenness. When this peeling unevenness occurs, the smoothness of the polyethylene-based resin-coated paper is significantly deteriorated, and as a polyethylene-based resin-coated paper requiring excellent smoothness without surface defects, especially as a polyethylene-based resin-coated paper for image material use However, there was a problem that the product was completely unsuitable and had no commercial value.

Secondly, when an image-forming layer is coated on a polyethylene resin-coated paper support to prepare an image material, the adhesion between the support and the image-forming layer, that is, so-called film adhesion is insufficient. There was a tendency. Particularly, in the case of a silver halide photographic material using a polyethylene-based resin-coated paper as a support, the film adhesion of the photographic emulsion layer tends to be poor during the development process, that is, in the wet state. A silver halide photographic material having a poor photographic emulsion layer film sometimes causes a serious problem in practical use due to peeling of the emulsion layer from the support during the development process.

There are some technical proposals for eliminating and improving various problems and other kinds of defects of the polyethylene resin coated paper as described above. In order to improve the releasability during the production of polyethylene resin-coated paper, it has been proposed to incorporate various mold release agents into the polyethylene resin composition. For example, specific fatty acid amides described in JP-A-60-176036, polyalkylene glycol compounds described in JP-A-63-30841, fluorine-containing polymers described in JP-A-64-9444, JP-A-4-143748 Various mold release agents such as α-olefin modified silicones described in Japanese Patent Laid-Open Publication No. 2004-242242 have been proposed. However, even if these release agents are contained in the polyethylene resin composition, the effect of improving the releasability thereof is extremely insufficient, and there is little or no effect particularly at a production speed of 180 m / min or more. On the contrary, there was a problem that the adhesiveness between the base paper and the polyethylene resin layer deteriorates, and the film formation between the image forming layer and the polyethylene resin layer coated on the polyethylene resin coated paper deteriorates. .

Another attempt to improve the releasability during the production of polyethylene-based resin-coated paper has been disclosed in JP-B-62-19732.
Use of a chilled roll with a micro-roughened surface described in Japanese Patent Publication
The use of the cooling roll in which the fluororesin described in 1-24292 is embedded, and further, the melting peak described in JP-A-1-129249 is 110 ° C. or higher and the melt index is 5 to 20 g / Techniques have been proposed for the use of low density polyethylene resin which is 10 minutes. However, even if these cooling rolls and resins are used, the effect of improving the peelability of the polyethylene-based resin-coated paper is insufficient,
In particular, at a production speed of 180 m / min or more, the effect of improving the peelability was extremely insufficient or no effect.

On the other hand, a film of an image forming layer of an image material having a polyethylene resin-coated paper as a support and a support, particularly a film of a photographic emulsion layer of a silver halide photographic material in a wet state with a support. Several suggestions have been made to improve. The simplest method for improving the film formation between the image-forming layer and the support of the resin-coated paper-type image-forming material support and giving good coatability of the image-forming layer to the support is described in British Patent No. 971,058. As described in Japanese Patent Publication No. 1,060,526 and Japanese Patent Publication No. 1,060,526, the resin surface of the resin-coated paper-type image material support is subjected to electron impact. Electron bombardment is also known as corona discharge treatment. However, even if a conventionally known support surface for a resin-coated paper-type image material is subjected to a corona discharge treatment, film formation with the support of the image forming layer, particularly film formation in a wet state with the support of the photographic constituent layer is extremely high. There was a problem that the image could not be made in a good condition, and often the image forming material became weak with a film due to the storage conditions of the support, the air-conditioning conditions during corona treatment, and other unclear factors.

Further, JP-A-62-260149 and JP-A-63
-198048 and JP-A-1-137252 propose to provide an undercoat layer containing gelatin on the surface of a resin-coated paper type photographic support. However, even if a support for image materials provided with these subbing layers after subjecting a resin layer surface of a conventionally known resin-coated paper to corona discharge treatment, a film with a support of an image forming layer, particularly a photograph The film attachment in the wet state of the constituent layers to the support could not be made extremely good, and the factors causing the variation in the film attachment still remained.

[0011]

SUMMARY OF THE INVENTION Therefore, the first object of the present invention is to use paper as a substrate and to coat one of the base paper surfaces with a resin layer comprising a resin composition containing polyethylene resin as a main component. To provide a support for a resin-coated paper-type image material, in which the occurrence of peeling unevenness is significantly suppressed, there is no surface defect, the smoothness is excellent, and the film formation with the support of the image forming layer is extremely good. Is. A second object of the present invention is a resin layer comprising paper as a substrate and one of the base paper surfaces of which is a resin composition containing polyethylene resin as a main component, and is capable of producing 180 m / min or more without problems in molding process. Coated at speed,
Therefore, the resin has good productivity and is economically advantageous, the occurrence of peeling unevenness is remarkably suppressed, the surface is free of surface defects and the smoothness is excellent, and the film formation with the support of the image forming layer is extremely good. It is to provide a support for a coated paper type image material. A third object of the present invention is to obtain a photographic paper which is excellent in smoothness due to the remarkable suppression of the occurrence of peeling unevenness, and thus has a uniform glossy appearance, and a support of a photographic constituent layer. It is an object of the present invention to provide a resin-coated paper type photographic support having a very good film attachment. Other objects of the present invention will be apparent from the description below.

[0012]

Means and Actions for Solving the Problems As a result of intensive studies to solve the above-mentioned problems, the present inventors have used paper as a substrate, and the paper substrate surface on the side on which one of the image forming layers is provided has a polyethylene resin. In a support for an image material coated with a resin layer composed of a resin composition containing as a main component, the melting point (unit: ° C) of the polyethylene resin in the resin composition measured by DSC and the density gradient tube The density (unit: g / cm ³ ) is represented by Formula (1) and Formula (2), and its Mw / Mn (where Mw: weight average molecular weight, Mn: number average molecular weight) is 4 or more. It has been found that the object of the present invention can be achieved by a support for image material characterized by the following. Melting point ≧ 901 × Density-720 Formula (1) Melting point ≦ 901 × Density-711 Formula (2)

The density referred to in the present invention is specifically determined as follows. According to JISK6760, the resin to be measured is annealed at 100 ° C for 1 hour and then treated at 23 ° C.
After allowing to cool naturally for 16 hours or more, measurement was carried out with a density gradient tube prepared with water-isopropyl alcohol.

The melting point referred to in the present invention is specifically determined as follows. Perkin Elmer DSC (PerkinE
lmer7 type), heated from room temperature to 200 ° C. at a heating rate of 10 ° C./min, and kept at that temperature for 2 minutes.
Of the single or multiple endothermic peaks observed when cooling to 40 ° C at a cooling rate of 0 ° C / min, holding at that temperature for 2 minutes, and then heating to 200 ° C at a heating rate of 10 ° C / min, The temperature at which the peak position of the peak having the largest endothermic amount was given was defined as the melting point.

The Mw / Mn referred to in the present invention is specifically determined as follows. Waters 150-C (column:
Tosoh GMH-XL HT 8mmφ × 30cm × 3
Book, solvent: 1,2,4-trichlorobenzene, temperature: 1
Mw and Mn were measured by the gel permeation chromatography (GPC) method using 35 ° C. and a flow rate of 10 ml / min), and Mw / Mn was calculated.

An object of the present invention is to provide a polyethylene resin, which is produced by polymerizing a resin composition containing a polyethylene resin as a main component (hereinafter sometimes simply referred to as a polyethylene resin composition) using a metallocene polymerization catalyst. It has been found to be remarkably achieved by a support for an image material which is characterized by comprising a polyethylene resin having a long chain branch produced by a high pressure method.

The object of the present invention is to further improve the content of the polyethylene-based resin polymerized and produced using the metallocene polymerization catalyst in the polyethylene-based resin composition to 50 to 95% by weight based on the total polyethylene-based resin. I have found something to achieve. Furthermore, the object of the present invention has been found to be more remarkably achieved by providing an undercoat layer on the resin layer, and the present invention has been completed.

The melting point and density of the polyethylene resin composition used in the present invention satisfy the above formulas (1) and (2) from the viewpoint of uneven peeling and film formation with the support of the image forming layer. From the standpoint of workability, Mw / Mn needs to be 4 or more.

The polyethylene resin composition used in the present invention contains a polyethylene resin produced by polymerization using a metallocene polymerization catalyst. The content thereof is preferably 50 to 95% by weight with respect to the total polyethylene resin in the resin composition, from the viewpoints of molding processability, and the effect of improving peeling unevenness and film formation with the support of the image forming layer. 70 to 90% by weight is more preferable.

Polyethylene resins polymerized and produced using the metallocene polymerization catalyst used in the present invention include JP-A-3-502710, JP-A-60-35006, and JP-A-63-5.
01369, JP3-234717, JP3-234718
Zirconium-based, titanium-based or hafnium-based metallocene, as described or disclosed in Japanese Patent Publication No.
It is preferably one produced by polymerization using a combination of aluminoxane as a polymerization catalyst. Examples thereof include polyethylene-based resins such as ethylene homopolymers, copolymers of ethylene and α-olefins such as propylene, butene-1, hexene-1, and octene-1. They usually have a density of 0.85 to 0.5.
97g / cm ³ range, MFR 0.05-500g / 10min,
Preferably, those in the range of 0.08 to 300 g / 10 min can be used alone or in admixture of two or more.

As a polyethylene resin having a long chain branch produced by a high pressure method, which is contained in the polyethylene resin composition used in the present invention in combination with a polyethylene resin produced by polymerization using a metallocene polymerization catalyst. Are various polyethylene-based resins having long-chain branching by a high-pressure radical polymerization method under an atmosphere of 1000 to 3500 atm using an autoclave type reactor, a tubular type reactor, etc., and the content thereof is a resin composition. The amount is preferably 5 to 50% by weight, more preferably 10 to 30% by weight, based on the total polyethylene resin in the product. The polyethylene resin having a long chain branch produced by the high-pressure method is a homopolymer of ethylene, a copolymer of ethylene and propylene, butene-1, etc., an α-olefin,
Any known polyethylene-based resin produced by a high-pressure radical polymerization method such as a copolymer of ethylene and vinyl acetate can be used, and various densities, MFR, molecular weights and molecular weight distributions can be used. Is 0.85-0.935g /
Those having a cm ³ range and an MFR of 0.1 to 50 g / 10 min, preferably 0.4 to 50 g / 10 min can be used alone or in admixture of two or more.

Further, in the present invention, a polyethylene resin polymerized and produced by using the above metallocene polymerization catalyst and a polyethylene resin having a long chain branch produced by a high pressure method are added to the melting point and density gradient tube measured by the above DSC. The density measured by is represented by the equation (1) and equation (2),
Within the range where the Mw / Mn is 4 or more, one or more linear low-density polyethylene, medium-density polyethylene, high-density polyethylene, carboxylic acid-modified polyethylene and the like can be blended and used.

Further, the resin layer may have a multi-layer structure. When the resin layer has a multi-layer structure, the resin composition of the present invention as the resin composition of the outermost layer, the intermediate layer, the resin composition of the present invention as the resin composition of the innermost layer, or a resin having another property, such as a conventionally known one The composition can also be used.

A surface (hereinafter, may be abbreviated as a back surface) on a side opposite to a side (hereinafter, sometimes abbreviated as a front surface) on which a resin layer made of the resin composition according to the present invention is provided (hereinafter, may be abbreviated as a front surface). ) Is preferably coated with a resin capable of forming a film. In this case, the resin capable of forming a film is preferably a thermoplastic resin such as a polyolefin resin, a polycarbonate resin, a polyester resin or a polyamide resin. Among them, a polyolefin resin is more preferable from the viewpoint of melt extrusion coating property, and a polyethylene resin is particularly preferable. Further, it may be coated with an electron beam curable resin described or exemplified in JP-B-60-171404.

The coating thickness of the resin layer on the front side of the support for image materials in the present invention is usefully in the range of 4 to 100 μm, preferably in the range of 6 to 50 μm, and 9 to 35.
The range of μm is particularly preferred. The back surface of the base paper is coated with a resin capable of forming a film, and the resin is preferably a polyethylene-based resin, and the coating thickness is preferably set appropriately with the resin on the front side, particularly in the range of curl balance. Generally, the range of 4 to 100 μm is useful, but the range of 6 to 50 μm is preferable.

The method for coating the base paper surface of the image material support of the present invention with the polyethylene resin composition is as follows:
It is preferable to coat the resin composition on the running base paper by a so-called melt extrusion coating method, in which the resin composition is cast from the slit die into a film and coated by using a melt extruder. At that time, the temperature of the molten film is 280 to 280.
It is preferably 340 ° C. The slit die is preferably a flat die such as a T die, an L die, and a fishtail die, and the slit opening diameter is 0.1 to 2 mm.
It is desirable that In addition, before the resin composition is coated on the base paper, the base paper can be subjected to activation treatment such as corona discharge treatment and flame treatment, and this is preferable.
Further, as described in JP-B-61-42254, a resin layer may be coated on the running base paper after spraying the ozone-containing gas on the molten resin composition on the side in contact with the base paper. When both sides of the base paper are coated with resin layers, the front and back resin layers are extrusion-coated sequentially, preferably continuously, so that the base paper is coated by a so-called tandem extrusion coating method. However, the resin layer may have a multi-layered structure if necessary, and may be coated by a multi-layer extrusion coating method. Further, the surface of the surface of the support for the image material on which the image forming layer is coated is a glossy surface, a finely rough surface described in JP-B-62-19732, a matte surface or a silky surface. However, it is usually preferable to process the back resin layer surface on the opposite side to a matte surface. In particular, the effect of the present invention is remarkable in the support for image material in which the surface resin layer surface on the side where the image forming layer is provided is a glossy surface or a slightly rough surface.

Various additives can be contained in the front resin layer of the support for image materials of the present invention and, if necessary, in the back resin layer. Japanese Patent Publication No. 60-3430, Japanese Patent Publication No. 63-11655, Japanese Patent Publication No. 1-38291, Japanese Patent Publication No. 1-
Titanium dioxide pigments, white pigments such as zinc oxide, talc, calcium carbonate, etc., fatty acid amides such as stearic acid amide, arachidic acid amide, zinc stearate, and steer described in 38292 and JP-A-1-105245. Calcium phosphate, aluminum stearate, magnesium stearate, zinc palmitate, zinc myristate, fatty acid metal salts such as calcium palmitate, hindered phenols, hindered amines, phosphorus compounds and sulfur compounds described or exemplified in JP-A-1-105245. Various antioxidants such as cobalt blue, ultramarine blue, cerian blue, phthalocyanine blue and other blue pigments and dyes, cobalt violet, fast violet, manganese violet and other magenta pigments and dyes, JP-A-2-254440
Various additives such as fluorescent whitening agents and ultraviolet absorbers described or exemplified in Japanese Patent Publication No. JP-A No. 2003-242242 can be appropriately combined and contained. The additives can be included as a resin masterbatch or compound and are preferred.

The object of the present invention is more remarkably achieved by coating an undercoat layer on the surface resin layer on the side where the image forming layer is provided. That is, due to the synergistic effect of the resin layer made of the polyethylene resin composition of the present invention and the undercoat layer coated thereon, the film formation between the image forming layer and the support, particularly the photographic constituent layer and the support. It was found that the film adhesion in the wet state was significantly improved.

The subbing layer used in the practice of the present invention is preferably a subbing layer containing gelatin as a main component. Examples of such gelatin include lime-processed gelatin, acid-processed gelatin, enzyme-processed gelatin, gelatin derivatives such as gelatin reacted with an anhydride of dibasic acid, low-molecular gelatin described in JP-A-4-60633. Can be mentioned. Further, other hydrophilic polymers such as polyvinyl alcohol and starch can be used in combination with gelatin. The coating amount of gelatin for the undercoat layer is
A range of 0.005 to 1.0 g / m ² is useful, preferably 0.01 to 0.3 g / m ² , and more preferably 0.0.
It is in the range of 015 to 0.1 g / m ² . The pH of the undercoating liquid is not particularly limited, but in the case of photographic use, it is preferably pH 8 or less, more preferably pH 7 or less from the viewpoint of storage stability.

In the subbing layer used in the practice of the present invention,
Various additives can be contained. As a preservative, a p-hydroxybenzoic acid ester compound, a benzisothiazolone compound, an isothiazolone compound, etc. described or exemplified in JP-A-1-102551, and an anionic surfactant such as an alkylbenzene sulfonate or a sulphosuccinate as a surfactant are used. Surfactant, saponin,
Nonionic surfactants such as alkylene oxides, Japanese Patent Publication No. 47-9303, fluorinated surfactants described in U.S. Pat.No. 3,589,906, sulfobetaine-type surfactants described in JP-A 1-166035. Amphoteric surfactants such as surfactants, amino acids, esters of amino alcohols, etc. as emulsions or latexes, ethylene-acrylic, styrene-butadiene, styrene-acrylic, vinyl acetate-acrylic, ethylene-vinyl acetate , Butadiene-methacryl-based, vinylidene chloride-based polymers and emulsions or latexes of carboxy-modified polymers thereof, as hardeners, active halogen compounds, vinyl sulfone compounds, aziridine compounds,
Epoxy compounds, acryloyl compounds, isocyanate compounds, chromium alum, hardeners such as chromium sulfate and other toning agents, optical brighteners, matting agents, antifoggants or stabilizers, pH adjusters and the like are appropriately combined. It can be included.

As a method of providing the undercoat layer on the surface of the polyethylene resin used in the practice of the present invention, the image forming layer is formed between the surface of the running base paper and the winding of the polyethylene resin composition. It is preferable to carry out the so-called on-machine method, in which an undercoat coating liquid is applied and dried on the resin surface on the side where it is provided to form an undercoat layer. It is also possible to carry out the so-called off-machine method, in which the resin-coated paper is wound up, and then the winding is stored if necessary, and then a new undercoat layer is provided.
As an apparatus for applying the undercoat coating liquid, an air knife coater, a roll coater, a bar coater, a wire bar coater, a blade coater, a slide hopper coater,
Examples include curtain coaters, gravure coaters, flexo gravure coaters, and combinations thereof. Prior to coating, apply a corona discharge treatment to the resin surface,
It is desirable to carry out activation treatment such as flame treatment.
As a drying device for the applied coating liquid, various drying devices 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, a dryer using infrared rays, a heating dryer, a microwave, etc. Can be mentioned. Further, the drying condition is arbitrary, but it is generally performed at 60 to 150 ° C. for several seconds to 10 minutes.

The base paper used in the practice of the present invention is
Paper having natural pulp as a main component (hereinafter sometimes simply referred to as base paper) is advantageously used, but so-called synthetic paper in which synthetic fiber or synthetic resin film is imitated may be used.

The pulp constituting the base paper which is advantageously used in the practice of the present invention is described in JP-A-58-3742 and JP-A-58-3742.
60-67940, JP 60-69649, JP 61-354
It is advantageous to use an appropriately selected natural pulp as described or exemplified in Japanese Patent Publication No. 42, etc., but synthetic pulp or synthetic fiber other than natural pulp may be used if necessary. Natural pulp is subjected to chlorine, hypochlorite, chlorine dioxide bleaching on the tower, alkali extraction or alkali treatment, and if necessary, oxidative bleaching with hydrogen peroxide, oxygen, etc., and combinations thereof. The above-mentioned softwood pulp, hardwood pulp, and mixed wood of softwood and hardwood are advantageously used, and various kinds of kraft pulp, sulfite pulp, soda pulp and the like can be used.

The base paper which is advantageously used in the practice of the present invention may contain various additives when preparing a stock slurry. As the sizing agent, fatty acid metal salt or fatty acid, alkyl ketene dimer emulsion or epoxidized higher fatty acid amide, alkenyl or alkyl succinic anhydride emulsion, rosin derivative, etc. described in JP-B-62-7534 or dried Anionic, cationic or amphoteric polyacrylamide, polyvinyl alcohol, cationized starch, vegetable galactomannan, etc. as a paper strength enhancer, polyamine polyamide epichlorohydrin resin, etc. as a wet paper strength enhancer, clay, kaolin as a filler , Calcium carbonate, titanium oxide, etc., as a fixing agent, water-soluble aluminum salts such as aluminum chloride and vanadium sulfate, etc., as a pH adjusting agent, caustic soda, sodium carbonate, sulfuric acid, etc., and in other Japanese Patent Laid-Open No. 63-204251, Japanese Patent Laid-Open No. 1-266537
It is advantageous to appropriately combine color pigments, color dyes, optical brighteners and the like described or exemplified in Japanese Patent Publications and the like.

The base paper advantageously used for carrying out the present invention may contain various water-soluble polymers, antistatic agents and additives by a size press or a tab size press. As the water-soluble polymer, starch-based polymer, polyvinyl alcohol-based polymer, gelatin-based polymer, polyacrylamide-based polymer, cellulose-based polymer, etc. described or exemplified in JP-A 1-266537, sodium chloride, potassium chloride as an antistatic agent, etc. Alkali metal salts such as, alkaline earth metal salts such as calcium chloride and barium chloride, colloidal metal oxides such as colloidal silica, organic antistatic agents such as polystyrene sulfonate, emulsions and latexes,
Petroleum resin emulsions, ethylene-vinyl acetate copolymers, copolymers containing at least ethylene and acrylic acid (or methacrylic acid) as constituents as described or exemplified in JP-A-55-4027 and JP-A-1-180538. Combined emulsion or latex, pigments such as clay, kaolin, talc, barium sulfate, titanium oxide, etc., pH adjusting agents such as hydrochloric acid, phosphoric acid, citric acid, caustic soda, etc.
In addition, it is advantageous that the additives such as the above-mentioned coloring pigment, coloring dye and fluorescent brightening agent are appropriately combined and contained.

The thickness of the base paper used for carrying out the present invention is not particularly limited, but the basis weight is 20 to 250 g /
Those of m ² are preferred.

As the base paper which is advantageously used in the practice of the present invention, it is preferable that the thickness unevenness index Rpy in the paper making direction defined below is 350 mV or less, and 250 mV.
Those below are more preferable, and those below 160 mV are most preferable. The film thickness unevenness index Rpy mentioned here is a value specifically obtained as follows. Measuring pressure is about 30
A film thickness measuring instrument manufactured by Anritsu Co., Ltd., which measures the thickness variation of the sample as an electric signal through an electronic micrometer by running the sample between two spherical stylus with g / stroke of about 5 mm in diameter. Using the electronic micrometer with a sensitivity range of ± 15 μm / ± 3 V, the thickness variation of the sample in the papermaking direction was measured by running at a constant speed of 1.5 m / min in the papermaking direction of the sample after zero point adjustment. The obtained measurement signal value is used as an FFT analyzer CF-30 manufactured by Ono Sokki Co., Ltd.
Type 0 machine (input signal AC ± 1V, sampling 512
Point) to perform a fast Fourier transform under the processing conditions where the time window is Hanning window and the frequency range is 50 Hz.
Obtain the power spectrum (unit: mV) on the linear scale by adding and averaging 28 times of integration, and add 2/3 to the value obtained by summing the squares of the power values on the linear scale in the frequency range of 2 Hz to 25 Hz. It can be obtained by writing and raising to the power of 1/2. The other processing conditions are CF
-Perform under the initial setting conditions of the 300 type machine. Thickness unevenness index Rp
As a method for producing a base paper having y of 350 mV or less, specifically, a hardwood pulp which is short fiber and easy to smooth is used.
It is used in an amount of not less than 50% by weight, preferably not less than 50% by weight, and beaten by a beater so that the long fiber content is reduced as much as possible. For example, the beating of the pulp is preferably such that the weighted average fiber of the pulp after beating is 0.4 to 0.75 mm.
Next, with respect to a paper stock slurry to which internal additives have been added, JP-A-58-37642, JP-A-61-260240, and JP-A-
Using an appropriate papermaking method such as those described or exemplified in 61-284762, etc., papermaking is carried out by a papermaking machine normally used such as a Fourdrinier paper machine and a roundnet papermaking machine so that a uniform formation is obtained. After the papermaking, it is further calendered using a machine calendar, super calendar, thermal calendar, etc.
It is possible to manufacture a base paper having a thickness unevenness index Rpy of 350 mV or less.

On the surface of the backing resin layer of the support for image materials in the present invention, various back coat layers are applied for the purpose of preventing electrostatic charge after activation treatment such as corona discharge treatment and flame treatment. be able to. Further, the back coat layer is provided in JP-B-52-18020, JP-B-57-9059, JP-B-57-53940, JP-B-58-56859, and JP-A-59-59.
-214849, JP-A-58-184144, etc., or an inorganic antistatic agent, an organic antistatic agent, a hydrophilic binder, a latex, a curing agent, a pigment, a surfactant, etc. may be appropriately combined and contained. be able to.

The image material support of the present invention preferably has a thickness unevenness index Rpy of 400 mV or less, and 30
It is more preferably 0 mV or less, and particularly preferably 200 mV or less.

The support for image material of 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 purposes such as negative and positive, and printing materials. For example, silver chloride, silver bromide,
A silver chlorobromide, silver iodobromide or silver chloroiodide emulsion layer can be provided. The silver halide photographic emulsion layer can contain a color coupler to provide a multilayer silver halide color photographic constituent layer. Further, a photographic constituent layer for silver salt diffusion transfer method can be provided. As the binder for the photographic constituent layers, in addition to ordinary gelatin, hydrophilic polymer substances such as polyvinylpyrrolidone, polyvinyl alcohol, and sulfate ester compounds of polysaccharides can be used. Further, the above-mentioned photographic constituent layers can contain various additives. For example, as a sensitizing dye, a cyanine dye, a merocyanine dye, a chemical sensitizer, a water-soluble gold compound,
Sulfur compounds, etc., as antifoggants or stabilizers, hydroxy-triazolopyrimidine compounds, mercapto-heterocyclic compounds, etc., as coating aids, alkylbenzene sulfonates, sulfosuccinate salts, etc.
Dialkyl hydroquinone compounds, etc., as anti-staining agents, as well as optical brighteners, sharpness-improving dyes, antistatic agents, pH adjusters, foggants, and water-soluble iridium and water-soluble rhodium during the production and dispersion of silver halide. Compounds and the like can be contained in 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. The multilayer silver halide color photographic material may be processed with a developing solution containing a development accelerator such as benzyl alcohol, thallium salt and phenidone, or may be processed with a developing solution containing substantially no benzyl alcohol. it can.

The support for image material of the present invention can be used as a support for various heat transfer recording image receiving materials by coating various heat transfer recording image receiving layers. Examples of the synthetic resin used for the thermal transfer recording image-receiving layer include polyester resin, polyacrylic ester resin, polycarbonate resin, polyvinyl acetate resin, polyvinyl butyral resin,
Styrene acrylate resin, vinyltoluene acrylate resin and other ester bond resins, polyurethane resin and other urethane bond resin, polyamide resin and other amide bond resin, urea resin and other urea bond resin, and other polycaprolactam resin , Styrene-based resins, polyvinyl chloride resins, vinyl chloride-vinyl acetate copolymer resins, polyacrylonitrile resins and the like.
In addition to these resins, mixtures or copolymers of these can also 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 preferable. As the silicone oil, an oily one can be used, but a curable one is preferable. 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 amino-modified silicone oil and epoxy-modified silicone oil. The amount of the reactive silicone oil added is preferably 0.1 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. Further, the thickness of the image receiving layer is preferably 0.5 to 20 μm,
10 μm is more preferable.

The support for image material of the present invention can be used as a support for various ink jet recording materials by coating various ink receiving layers. 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 or fumaric acid. ,
Ordinary polyvinyl alcohols 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, methyl cellulose carboxylate,
Cellulose derivatives such as hydroxyethyl cellulose, polyvinylpyrrolidone, polyvinylpyridinium halide,
Sodium polyacrylate, 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, etc. Vinyl acetate polymer latex such as polyvinyl acetate, vinyl acetate / maleic acid ester copolymer, vinyl acetate / acrylic acid ester copolymer, ethylene / vinyl acetate copolymer, acrylic acid ester polymer, methacrylic acid ester Acrylic polymer or copolymer latex such as polymer, ethylene / acrylic acid ester copolymer, styrene / acrylic acid ester copolymer, vinylidene chloride copolymer latex, or carboxyl of these various polymers Functional group-modified polymer LA by functional group-containing monomer Water-based adhesives such as thermosetting synthetic resin system such as epoxy resin, melamine resin, urea resin, etc. and synthetic resin system such as polymethylmethacrylate, polyurethane resin, unsaturated polyester resin, vinyl chloride / vinyl acetate copolymer, polyvinyl butyral, alkyd resin, etc. Adhesive, Japanese Patent Publication No. 3-24906, Japanese Patent Application Laid-Open No. 3-281383, Japanese Patent Application No. 4-
Inorganic binders such as alumina sol and silica sol described or exemplified in 240725 can be mentioned, and these can 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 the surfactant, a long-chain alkylbenzene sulfonate, an anionic surfactant such as a long-chain, preferably a branched alkylsulfosuccinate ester salt, a long-chain, preferably a polyalkylene oxide ether of a branched alkyl group-containing phenol. Nonionic surfactants such as polyalkylene oxide ethers of long-chain alkyl alcohols, JP-B-47-9303
Silane coupling agents such as γ-aminopropyltriethoxysilane and N-β (aminoethyl) γ-aminopropyltrimethoxysilane, such as fluorinated surfactants described in U.S. Pat. As a polymer hardener, active halogen compounds, vinyl sulfone compounds, aziridine compounds, epoxy compounds,
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 JP, JP 1-266537 or a color pigment described or exemplified in JP-A 1-266537, such as a color brightener, fluorescent whitening agent, as a yellowing inhibitor sodium hydroxymethane sulfonate,
As an ultraviolet absorber, such as sodium p-toluenesulfinate, as an antioxidant, such as a benzotriazole compound having a hydroxy-di-alkylphenyl group at the 2-position,
As a pencil writing agent such as a polyhindered phenol compound described or exemplified in JP-A-1-105245, starch particles, barium sulfate, silicon dioxide or other organic or inorganic fine particles having a particle diameter of 0.2 to 5 μm, Organopolysiloxane compounds described or exemplified in JP-A-4-1337, p
As the H-adjusting agent, various additives such as caustic soda, sodium carbonate, sulfuric acid, hydrochloric acid, phosphoric acid, citric acid, octyl alcohol, and silicon antifoaming agent can be appropriately combined and contained.

[0046]

The present invention will be described in detail below with reference to examples, but the contents of the present invention are not limited to the examples.

100% by weight of pulp was beaten from a mixed pulp consisting of 50% by weight of hardwood bleached kraft pulp, 35% by weight of hardwood bleached sulfite pulp and 15% by weight of softwood bleached sulfite pulp to a fiber length of 0.6 mm. In contrast, 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), 0.4 part by weight of polyamide epichlorohydrin resin and an appropriate amount. An optical brightener, a blue dye, and a red dye were added to prepare a stock slurry. The fiber length of the pulp after beating is based on JAPAN TAPPI Paper Pulp Test Method N.
O.52-89 "Paper and Pulp Fiber Length Test Method" In accordance with the length-weighted average fiber length measured by a Kajaani FS-100 machine. Then, 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 a wet part is used for 15 to 10 minutes.
After performing a three-stage wet press in which the linear pressure in the range of 0 kg / cm was adjusted, it was treated with a smoothing roll, and in the subsequent drying part, the two-stage tightness in which the linear pressure was adjusted in the range of 30 to 70 kg / cm. After pressing, it was dried. Then, in the middle of drying, 25 g of a size press liquid consisting of 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, 4 parts by weight of sodium chloride and 92 parts by weight of water was added. m ² size press, dried so that the final water content of the base paper is 8% by weight of absolute dry water, machine calendered with a linear pressure of 70 kg / cm, and then temperature 150 ℃, linear pressure 150 kg / cm Thermal calendaring under conditions of 170g / m ² basis weight and film thickness unevenness index Rpy is 1
A base paper of a support for an image material having a thickness of 40 mV was produced.

Next, after the base paper surface (rear surface) on the side opposite to the side on which the image forming layer is coated is subjected to corona discharge treatment, a low density polyethylene resin (density 0.924 g / cm ³ , MFR
= 0.8 g / 10 min) 30 parts by weight and high-density polyethylene resin (density 0.967 g / cm ³ , MFR = 15 g / 10 min) 70 parts by weight are melted and mixed in advance by using a kneading extruder to prepare the mixture. The polyethylene resin composition comprising the compound resin was melt-extrusion coated at a resin temperature of 320 ° C. to a resin thickness of 25 μm at a running speed of the base paper of 200 m / min. At this time, as the cooling roll, the roughness was designed so that the center surface average roughness SRa of the back resin layer surface was 1.3 μm. The cooling roll roughened by the liquid honing method was used, and the cooling water temperature was operated at 12 ° C.

Subsequently, the surface of the base paper was subjected to corona discharge treatment, and the following polyethylene resin compositions (Examples 1 to 4 and Comparative Examples 1 to 6) were applied to the surface at a resin temperature of 320 ° C. for 32 μm.
A resin thickness of m was melt extrusion coated at a running speed of the base paper of 200 m / min. The melt extrusion coating of the front and back polyethylene resin compositions 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 by operating at a cooling water temperature of 12 ° C. using a mirror-like cooling roll.

The polyethylene resins (T1, T2, L1, L) described in Table 1 used to form the polyethylene resin compositions for the surface resin layer (Examples 1 to 4, Comparative Examples 1 to 6).
2, M1, M2, M3) are as follows.

As the polyethylene resins (T1, T2), resins produced by a conventional polymerization method using a Ziegler catalyst were used.

The polyethylene resins (L1 and L2) are
A resin produced by a high pressure radical polymerization method was used.

As the polyethylene resin (M1 to M3),
A resin prepared from an ethylene / butene-1 copolymer based on a polymerization method using a metallocene polymerization catalyst described in JP-A-3-502710 was used.

As the polyethylene resin composition for the surface resin layer, the following (Examples 1 to 4 and Comparative Examples 1 to 6) were used.

As a polyethylene resin composition (Example 1), 76.1 parts by weight of a polyethylene resin (M1) and 13.4 parts by weight of a polyethylene resin (L1) were used, and aluminum hydroxide was contained (Al ₂ O _{3 with} respect to titanium dioxide). 0 minutes.
Polyethylene resin composition of Table 2 consisting of 10 parts by weight of anatase type titanium dioxide pigment surface-treated with 75% by weight) and 0.5 part by weight of zinc stearate.

As a polyethylene resin composition (Example 2), 76.1 parts by weight of polyethylene resin (M2) and 13.4 parts by weight of polyethylene resin (L1), 10 parts by weight of the above anatase type titanium dioxide pigment, zinc stearate 0 .5
Polyethylene resin composition of Table 2 consisting of parts by weight

As a polyethylene resin composition (Example 3), 44.8 parts by weight of a polyethylene resin (M1) and 44.7 parts by weight of a polyethylene resin (L1), 10 parts by weight of the above anatase type titanium dioxide pigment, zinc stearate 0 .5
Polyethylene resin composition of Table 2 consisting of parts by weight

As a polyethylene resin composition (Example 4), 62.7 parts by weight of a polyethylene resin (M3) and 26.8 parts by weight of a polyethylene resin (L2), 10 parts by weight of the above anatase type titanium dioxide pigment, zinc stearate 0 .5
Polyethylene resin composition of Table 2 consisting of parts by weight

As a polyethylene resin composition (Comparative Example 1), polyethylene of Table 2 comprising 89.5 parts by weight of polyethylene resin (T1), 10 parts by weight of the anatase type titanium dioxide pigment, and 0.5 part by weight of zinc stearate. Resin composition

As a polyethylene resin composition (Comparative Example 2), polyethylene of Table 2 comprising 89.5 parts by weight of a polyethylene resin (T2), 10 parts by weight of the anatase type titanium dioxide pigment, and 0.5 part by weight of zinc stearate. Resin composition

As a polyethylene resin composition (Comparative Example 3), polyethylene of Table 2 comprising 89.5 parts by weight of a polyethylene resin (L1), 10 parts by weight of the anatase type titanium dioxide pigment, and 0.5 part by weight of zinc stearate. Resin composition

As a polyethylene resin composition (Comparative Example 4), a polyethylene resin (M1) (89.5 parts by weight), the anatase type titanium dioxide pigment (10 parts by weight), and zinc stearate (0.5 parts by weight) described in Table 2 were used. Resin composition

As a polyethylene resin composition (Comparative Example 5), 85.9 parts by weight of a polyethylene resin (M1) and 3.6 parts by weight of a polyethylene resin (L1), 10 parts by weight of the above anatase type titanium dioxide pigment, zinc stearate 0 .5 parts by weight of the polyethylene resin composition of Table 2

As a polyethylene resin composition (Comparative Example 6), 9.0 parts by weight of a polyethylene resin (M1), 80.5 parts by weight of a polyethylene resin (L1), 10 parts by weight of the above anatase type titanium dioxide pigment, zinc stearate 0 .5 parts by weight of the polyethylene resin composition of Table 2

Further, after the corona discharge treatment on the back resin layer surface of the resin-coated paper, the following back coating liquid was applied on-machine. As a dry weight, a backcoat coating solution comprising colloidal silica: styrene latex = 1: 1 and further containing sodium polystyrene sulfonate 0.021 g / m ^{2 and} an appropriate amount of a coating aid and the like is used as a latex content (solid weight). The amount of the coating was 0.21 g / m ^{2 (} calculation) to obtain a support for image materials.

Molding processability of the polyethylene resin composition for the surface resin layer at the time of producing the resin-coated paper type image material support as described above, and the evaluation method of the obtained sample as the image material support. Was evaluated by the method described below.

As a method for evaluating the moldability of the polyethylene resin composition for the surface resin layer at the time of producing the support for image materials, the lateral length of the resin coating portion on the surface is measured to determine the degree of neck-in. In addition to the evaluation, the degree of streaking of the molten resin film, the presence or absence of film breakage depending on the degree of drawdown property, and the molding processability such as flow instability due to surging or draw resonance were comprehensively evaluated. The evaluation criteria are ⊚: extremely good, ∘: good, Δ: somewhat bad but practically no problem, and x: bad and practically problematic to some extent.

The peeling unevenness was evaluated by observing the surface state of the mirror surface on the front side of the image material support by oblique light with respect to the sample 6 hours after the start of the production of the image material support under the above-mentioned manufacturing conditions. The degree of occurrence of peeling unevenness was visually judged. As the evaluation standard of the degree of peeling unevenness, ○;
Peeling unevenness is small and smoothness is good. Δ: Peeling unevenness is slightly generated, but there is no problem in practical use. X: Peeling unevenness is large, and there are some practical problems.

The film forming of the image forming layer of the support for image material was evaluated as follows using a silver halide black and white photographic constituent layer as the image forming layer. First, a black and white photographic printing paper was obtained by providing a photographic emulsion layer and its protective layer after corona discharge treatment on the surface resin surface containing the titanium dioxide pigment of the support for image materials. The photographic emulsion layer was prepared by forming and dispersing 19.2 g of silver halide grains of silver nitrate in 14.4 g of gelatin in the presence of 1.2 × 10 ^-5 g of potassium hexachloroiridium (III) ArBr /. AgCl
/AgI=95/4.5/0.5 (mol%) having an average particle size of 0.6 .mu.m having a halogen composition of 0.5 .mu.m and the sensitivity substantially increased by sulfur sensitization and gold sensitization. ,
[0] surface-containing neutral silver halide photographic emulsion, and in addition to gelatin necessary for film formation, an appropriate amount of stabilizer, sensitizing dye, coating aid, hardener, optical brightener, thickening agent. Agents, filter dyes, etc., and were coated in multiple layers together with the protective layer at a coating amount corresponding to 2.2 g / m ² of silver nitrate and 4.4 g / m ² of gelatin. The protective layer contains a coating agent and a hardening agent in addition to gelatin corresponding to ² g / m ² .

The coated and dried sample was kept at 35 ° C. and room temperature for 1 hour.
After storage for a day, the sample was developed with D-72 developer for 90 seconds, scratched the surface of the emulsion surface with nails at intervals of 1 cm in each length and width to make a grid-like scratch, and then rub the surface with running finger in running water. ,
The degree of peeling of the photographic emulsion layer was evaluated. As the evaluation criteria, ⊚: no peeling of photographic emulsion layer and extremely good film attachment, ◯: slight peeling of photographic emulsion layer, good film attachment, Δ: slight peeling of photographic emulsion layer, The degree of film attachment is not a problem for practical use, and x is the degree of peeling of the photographic emulsion layer, and the degree of film application is a problem for practical use.

The value calculated from the right side of the equation (1) using the density was set as mp1, and the value calculated from the right side of the equation (2) was set as mp2.

The results obtained are shown in Table 3.

[0073]

[Table 1]

[0074]

[Table 2]

[0075]

[Table 3]

From the results shown in Table 3, the melting point of the polyethylene resin in the resin composition measured by DSC in the support for image material coated with the resin layer composed of the resin composition containing polyethylene resin as the main component. And the density measured by the density gradient tube are represented by the formulas (1) and (2), and the Mw / Mn thereof is 4 or more, the image material supports (Examples 1 to 4) are An excellent support for an image material, which has a good moldability of the polyethylene resin composition, is free from uneven peeling, has a good smoothness, and has a good film formation of the photographic emulsion layer. Understand well.
In particular, as the content of the polyethylene resin polymerized and produced using the metallocene polymerization catalyst in the polyethylene resin composition for the surface resin layer, from the viewpoint of the effect of improving peeling unevenness and film formation of the photographic emulsion layer, On the other hand, it is preferably 50 to 95% by weight (comparison between Examples 1 to 4 and Comparative Examples 5 and 6).
Understand well.

On the other hand, samples other than the present invention (Comparative Examples 1 to 6)
It can be seen that each has a problem. When the melting point does not satisfy the formulas (1) and (2) (Comparative Examples 1 to 1)
In 3), the degree of peeling unevenness is poor and is a problem. In addition, when a resin containing a polyethylene resin having Mw / Mn of less than 4 as a main component is used (Comparative Example 4 and Comparative Example 5), moldability is poor, which is a problem.

Examples 5 to 8 and Comparative Examples 7 to 12 In the same manner as in Examples 1 to 4 and Comparative Examples 1 to 6, after the back coat coating liquid was applied, the resin coated paper was continuously wound up. Corona discharge treatment was applied to the surface resin surface of the support, and 1.5 g of lime-processed gelatin, 0.3 g of a 10% by weight methanol solution of butyl paraoxybenzoate in methanol, 5 parts of sulfosuccinic acid-2-ethylhexyl ester salt in methanol and water were added. A gelatin coating amount of 0.06 g was obtained by adding 0.45 g of a mixed solution of 0.5% by weight and 0.36 g of an aqueous solution of 10% by weight of the amphoteric surfactant represented by Chemical Formula 1, and adjusting the total amount to 100 g with water. The support for image material was obtained by applying on-machine coating uniformly so as to have m ² . The evaluation of the film formation of the photographic emulsion layer was carried out on a photographic paper having a photographic constituent layer coated on the undercoat layer.

[0079]

Embedded image

The results obtained are shown in Table 4.

[0081]

[Table 4]

From the results shown in Table 4, the melting point of the polyethylene resin in the resin composition measured by DSC in the support for image material coated with the resin layer composed of the resin composition containing polyethylene resin as the main component. And the density measured by the density gradient tube is represented by the formulas (1) and (2), and the Mw / Mn thereof is covered with a surface resin layer of 4 or more, and the surface resin layer is on-machine. The support for image materials of the present invention (Examples 5 to 8) coated with an undercoat layer is
It is an excellent support for image materials, in which the polyethylene resin composition has good moldability, does not cause uneven peeling, has good smoothness, and has good film formation of the photographic emulsion layer. I understand.

On the other hand, samples other than the present invention (Comparative Examples 7 to 12)
Although the film formation of the photographic emulsion layer is good, the problem is that the molding processability of the polyethylene resin composition is poor and the degree of uneven peeling is poor.

The following silver halide color photographic constituent layers were used in place of the silver halide black and white photographic constituent layers, and D-
The same results as in Examples 1 to 4 and Comparative Examples 1 to 6 were obtained in the same manner as in Examples 1 to 4 and Comparative Examples 1 to 6 except that a commercially available color developer was used instead of the 72 developer. It was

The silver halide color photographic constituent layers are yellow colored.
Blue-sensitive emulsion layer containing color coupler, intermediate containing color mixing inhibitor
Layer, green-sensitive emulsion layer containing magenta color coupler, UV absorbing
UV absorbing layer containing sorbent, red containing cyan coupler
Consists of an emulsion-sensitive layer and a protective layer, and the total amount of gelatin is 8 g /
m²contains. Each color sensitive emulsion layer is made of silver nitrate at 0.6 g / m ²
Containing silver chlorobromide corresponding to
In addition to gelatin necessary for dispersion and film formation, an appropriate amount of fog prevention
Agents, sensitizing dyes, coating aids, hardeners, thickeners and appropriate amounts of flux
Including filter dyes.

Further, an ink jet image receiving material was prepared by coating the following ink jet image receiving layer in place of the silver halide black-and-white photographic constituent layers on the support for image material used in Examples 5 to 8 and Comparative Example 12. . As a result, the inkjet image-receiving material having the image material support of the present invention had an excellent glossy appearance because there was no uneven peeling of the support, but on the other hand, for image materials other than the present invention. The inkjet image-receiving material having a support has a problem in that the glossiness of appearance is inferior because the peeling unevenness is often generated.

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 cellulose (etherification degree: 0.7 to 0.8, viscosity of a 2 wt% aqueous solution with a B type viscometer is 5 cp or less),
Epoxy compound (NER-010 manufactured by Nagase & Co., Ltd.)
5% by weight methanol solution of 0.3 g, sulfosuccinic acid-2-ethylhexyl ester salt of methanol and water 5
A coating liquid consisting of 0.5 g of a weight% mixed liquid and 31.7 g of pure water was applied to form a solid content of 7 g / m ² and formed.

[0088]

According to the present invention, the occurrence of uneven peeling during the production of a support for an image material in which the base paper surface on the side where the image forming layer is provided is coated with a polyethylene resin layer is remarkably improved. It is possible to provide an excellent resin-coated paper-type image material support which has a high appearance glossiness, a good image forming layer film adhesion, a good molding processability, and a stable production.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobushige Ikeya 3-10 Shiodori, Kurashiki-shi, Okayama Mitsubishi Chemical Corporation Mizushima Development Laboratory (72) Inventor Takuya Seri 3-10 Shiodori, Kurashiki-shi, Okayama Address Mitsubishi Chemical Co., Ltd. Mizushima Development Laboratory

Claims (5)

[Claims] 1. A support for an image material, comprising paper as a substrate, and a paper substrate surface on one side of which an image forming layer is provided is coated with a resin layer made of a resin composition containing a polyethylene resin as a main component. Polyethylene resin 50 produced by polymerizing the polyethylene resin by using a metallocene polymerization catalyst
95% by weight and 50 to 5% by weight of a polyethylene resin having a long chain branch produced by a high pressure method, the melting point (unit: ° C) and density gradient of the polyethylene resin in the resin composition measured by DSC. The density (unit: g / cm ³ ) measured by a tube is represented by the formulas (1) and (2), and its Mw / Mn (where Mw: weight average molecular weight, Mn: number average molecular weight) is A support for an image material, which is 4 or more. Melting point ≧ 901 × Density-720 Formula (1) Melting point ≦ 901 × Density-711 Formula (2) 2. The support for image materials according to claim 1, which has an undercoat layer on the resin layer. 3. The paper substrate surface opposite to the side on which the image forming layer is provided is coated with a resin layer made of a resin composition containing a resin capable of forming a film as a main component. Image material support. 4. The support for image materials according to claim 3, wherein the resin capable of forming a film is a polyethylene resin. 5. The support for image materials according to claim 1, 2, 3 or 4, wherein the image forming layer is a photographic constituent layer.