JP3490120B2 - Support for imaging materials - Google Patents

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 composed of a resin composition, and more specifically, the occurrence of peeling unevenness is remarkably suppressed, and the 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,
Japanese Patent Laid-Open No. 63-307979 discloses a technique relating to an ink jet 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. Further, the production of polyethylene resin-coated paper is carried out by operating the melt extruder continuously for at least 2 to 3 days from the start of operation, usually for 1 week, and sometimes for 1 month, 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 it would be completely inappropriate and of 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 releasing agents such as α-olefin-modified silicone described in Japanese Patent Publication 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 the melting peak described in JP-A-1-129249 is 110 ° C. or higher and the melt index is 5 to 20 g / 10. Techniques have been proposed for the use of low density polyethylene resin. However,
Even if these cooling rolls and resins are used, the effect of improving the releasability of the polyethylene resin-coated paper is insufficient, and especially at a production speed of 180 m / min or more, the effect of improving the releasability is extremely insufficient or completely effective. There was no

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 was weak with a film due to storage conditions of the support, air conditioning conditions during corona treatment, and other factors whose cause was unknown.

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 one surface of the base paper is coated with a resin layer composed of 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 having a paper substrate as one substrate and one of the base paper surfaces of which is a resin composition containing polyethylene resin as a main component, and a production rate of 180 m / min or more without any 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 for Solving the Problems As a result of intensive studies for solving the above problems, the present inventors have found that paper is used as a substrate and the paper substrate surface on the side on which one of the image forming layers is provided is mainly made of polyethylene resin. In a support for an image material coated with a resin layer comprising a resin composition as a component, a polyethylene resin in the resin composition is polymerized and produced using a metal metallocene polymerization catalyst, and the melt is defined by JIS K 6760. JIS was produced by polymerization using a polyethylene resin having a flow rate of 5 g / 10 minutes or more and a metal polymerization catalyst other than the metal metallocene polymerization catalyst (hereinafter sometimes referred to as component A).
The melt flow rate specified by K 6760 is 0.
Polyethylene resin having a content of 3 g / 10 minutes or less, which may be hereinafter referred to as component B), and a polyethylene resin component consisting of the above two components in the resin composition (hereinafter also referred to as polyethylene resin component) It was found that the object of the present invention can be achieved by a support for an image material characterized in that Mw / Mn of (wherein Mw: weight average molecular weight, Mn: number average molecular weight) is 5 or more. It was

The Mw / Mn referred to in the present invention is specifically determined as follows. Waters 150-C (column:
Tohso GMH-XL HT 8mmφ × 3cm × 3 pieces,
Solvent: 1,2,4-trichlorobenzene, temperature: 135
Mw and Mn were measured by the gel permeation chromatography (GPC) method using (° C., flow rate 10 ml / min), and Mw / Mn was calculated.

An object of the present invention is to use a polyethylene-based resin prepared by polymerization using a metal metallocene polymerization catalyst in a resin composition containing polyethylene resin as a main component (hereinafter, may be simply referred to as polyethylene-based resin composition). It has been found that the content can be remarkably achieved by setting the resin content to 30% by weight or more based on the total polyethylene resin. Further, an object of the present invention is that the Mw / Mn of the polyethylene resin component is 5
As described above, it has been found that this is remarkably achieved by using a resin composition of preferably 7.0 or more. Furthermore,
The object of the present invention was found to be more remarkably achieved by providing an undercoat layer on the resin layer, and arrived at the present invention.

The polyethylene resin composition used in the practice of the present invention contains a polyethylene resin polymerized and produced using a metal metallocene polymerization catalyst. The content thereof is preferably 30% by weight or more based on the total polyethylene resin in the resin composition from the viewpoints of molding processability, and the effect of improving the unevenness of peeling and the film formation with the support of the image forming layer.

Polyethylene resins polymerized and produced using a metal metallocene polymerization catalyst used in the practice of the present invention include those disclosed in JP-A-3-502710, JP-A-60-35006,
As described or disclosed in JP-A-63-501369, JP-A-3-234717, JP-A-3-234718, etc., a zirconium-based or hafnium-based metallocene is preferably combined with methylaluminoxane. It is produced by polymerization using a catalyst having an increased catalytic activity as a polymerization catalyst. Among them, JIS K676
Melt flow rate defined by 0 (hereinafter simply referred to as MFR
Is 5 g / 10 minutes or more, and the polyethylene resin component in the resin composition has a Mw / Mn of 5 or more, low density polyethylene having various densities, molecular weights and molecular weight distributions. Resins, medium density polyethylene resins, high density polyethylene resins, propylene containing ethylene as a main component, copolymers with α-olefins such as butylene, carboxy-modified polyethylene resins and mixtures thereof can be mentioned, but usually the density Is from 0.90 to 0.97g / cm
3, MFR of 5 to 500 g / 10 minutes, preferably 8 to
Those in the range of 300 g / 10 minutes can be used alone or as a mixture of two or more kinds.

In the polyethylene resin composition used in the practice of the present invention, a metal polymerization catalyst other than the metal metallocene polymerization catalyst which is contained in combination with the polyethylene resin produced by polymerization using the metal metallocene polymerization catalyst is used. Examples of the polyethylene-based resin produced by polymerization include various polyethylene-based resins produced by polymerization using the Ziegler method, the Phillips method, etc., and JIS K 676
The MFR defined by 0 is 0.3 g / 10 min or less, and its content is preferably less than 70% by weight, more preferably less than 50% by weight based on the total polyethylene resin in the resin composition. preferable. As those polyethylene-based resins, low-density polyethylene resin, medium-density polyethylene resin, linear low-density polyethylene resin, ethylene and propylene, copolymers of α-olefins such as butylene,
Carboxy-modified polyethylene resin and the like and mixtures thereof can be used with various densities, molecular weights and molecular weight distributions, but usually the density is in the range of 0.90 to 0.97 g / cm3 and the MFR is 0.3 g / 10. Minutes or less, preferably those having an MFR of 0.05 to 0.3 g / 10 minutes can be used alone or in combination of two or more kinds.

As the polyethylene resin composition, the polyethylene resin composition consisting of the component A and the component B in the composition has a Mw / Mn of 5 or more. From the viewpoint of moldability of the resin composition, Mw / Mn. Use a value of 7.0 or more.

Further, the resin layer may have a multi-layer structure. When the resin layer has a multi-layered structure, it is also possible to use a resin composition having other properties and constitutions, such as a resin composition of the present invention as the outermost layer resin composition and a conventionally known resin composition as the lower layer resin composition.

The side of the base paper of the image material support of the present invention opposite to the side on which the resin layer comprising the resin composition of the present invention is provided (hereinafter sometimes abbreviated as the front side) (hereinafter sometimes referred to as the back side). The surface of () (hereinafter sometimes abbreviated as the back surface) is covered with 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 or a polyamide resin is preferable, and among them, a polyolefin resin is more preferable from the viewpoint of melt extrusion coating property, and a polyethylene resin is particularly preferable. Also,
It may be coated with an electron beam curing resin described or exemplified in JP-B-60-17104.

The coating thickness of the resin layer on the front side of the image material support in the present invention is usefully in the range of 4 to 100 μm, preferably 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 flow-cast from the slit die into a film shape using a melt extrusion machine. 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.
Is desirable. Further, it is preferable that the base paper is subjected to an activation treatment such as a corona discharge treatment or a flame treatment before the base paper is coated with the resin composition. Also, Japanese Examined Japanese Patent Sho 61-422
As described in Japanese Patent Laid-Open No. 54-54, a resin layer may be coated on the running base paper after the ozone-containing gas is blown to the molten resin composition on the side in contact with the base paper. When both sides of the base paper are coated with a resin layer, 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. Preferably, the resin layer may be coated by a multi-layer extrusion coating method, which has a multi-layer structure if necessary. 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. The reverse resin layer surface on the opposite side is usually preferably processed into 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 brighteners and ultraviolet absorbers described or exemplified in Japanese Patent Publication No. JP-A No. 2003-242242 may be appropriately combined and contained. The additives are preferably contained as a resin masterbatch or compound.

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 comprising 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, such as low-molecular gelatin described in JP-A-4-60633. I can give you. 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 0.005-1.0 g / m ² is useful, preferably 0.01-0.3 g / m ² , and more preferably 0.015-.
It is in the range of 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, other toning agents, optical brighteners, matting agents, antifoggants or stabilizers, pH adjusters, etc. It can be included.

The subbing layer used in the practice of the present invention may be provided on the polyethylene resin surface by coating the running base paper surface with the polyethylene resin composition and then forming the image forming layer between the winding. 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 raised. 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 obtained by converting synthetic fibers or synthetic resin film into pseudo paper may be used.

Pulp constituting the base paper which is advantageously used in the practice of the present invention is disclosed in JP-A-58-37642 and JP-A-58-37642.
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 was subjected to usual 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 such as softwood pulp, hardwood pulp and mixed wood of softwood and hardwood is advantageously used, and various types such as kraft pulp, sulfite pulp and soda pulp can be used.

The base paper advantageously used in the practice of the present invention may contain various additives when preparing the 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 the coloring pigments, coloring dyes, optical brighteners and the like described or exemplified in Japanese Patent Publication No.

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 constituent elements described or exemplified in JP-A-55-4027 and JP-A-1-180538. Polymer emulsions or latexes, pigments such as clay, kaolin, talc, barium sulfate, titanium oxide, etc., pH regulators 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.

Further, 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
Those having a voltage of mV or less are more preferable, and those having a voltage of 160 mV or less are most preferable. The film thickness unevenness index Rpy mentioned here is a value specifically obtained as follows. Two spherical diameters of about 5 mm with measuring pressure of about 30 g / stroke
The film thickness measuring instrument manufactured by Anritsu Corporation is used to measure the thickness variation of the sample as an electric signal through the electronic micrometer, and the sensitivity range of the electronic micrometer is ± 15 μm / Under the condition of ± 3V,
After adjusting the zero point, the thickness variation of the sample in the papermaking direction was measured by scanning the sample in the papermaking direction at a constant speed of 1.5 m / min, and the obtained measurement signal value was used as an FFT analyzer manufactured by Ono Sokki Co., Ltd. Using a CF-300 type machine (input signal AC ± 1 V, sampling 512 points), a time scale is a Hanning window, a fast Fourier transform is performed under the processing condition of a frequency range of 50 Hz, and a linear scale is obtained by adding and averaging 128 times of integration. The power spectrum (unit: mV) at
1/3 by multiplying 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 by 2/3
It can be obtained by squaring. The other processing conditions are the initial setting conditions of the CF-300 type machine. As a method for producing a base paper having a film thickness unevenness index Rpy of 350 mV or less, specifically, 30% by weight or more, preferably 50% by weight or more of hardwood pulp, which is short fiber and easy to smooth, is used, and long fibers are beaten by a beater. Beat so that the minutes are as small 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-61-2
Papermaking is performed by a suitable papermaking machine such as a Fourdrinier paper machine and a roundnet papermaking machine using a suitable papermaking method such as described or exemplified in Japanese Patent No. 84762 to obtain a uniform formation. After papermaking, calendering is performed using a machine calendar, super calendar, thermal calendar, etc.
It is possible to produce a base paper having a film thickness unevenness index Rpy of 350 mV or less.

After the activation treatment such as corona discharge treatment and flame treatment is performed on the back resin layer surface of the support for image material in the present invention, various back coat layers are coated to prevent static electricity. 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 support for image materials in the present invention preferably has a thickness unevenness index Rpy of 400 mV or less, more preferably 300 mV or less, particularly preferably 200 mV or less.

The support for image materials in the present invention is coated with various photographic constituent layers and is used for color photographic printing paper, black and white photographic printing paper, typesetting photographic paper, copy photographic paper, reversal photographic material. , Silver salt diffusion transfer method, 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 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 sensitizing dyes, cyanine dyes, merocyanine dyes, etc., as chemical sensitizers, water-soluble gold compounds, sulfur compounds, etc., 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., optical brightener, sharpness improvement Dyes, antistatic agents, pH adjusters,
A fogging agent and a water-soluble iridium or water-soluble rhodium compound may be appropriately combined and contained during the production and dispersion of the silver halide.

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 or phenidone, or may be processed with a developing solution containing substantially no benzyl alcohol. it can.

The support for image material in 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. As the synthetic resin used for the thermal transfer recording image-receiving layer, a resin having an ester bond such as a polyester resin, a polyacrylic ester resin, a polycarbonate resin, a polyvinyl acetate resin, a polyvinyl butyral resin, a styrene acrylate resin, or a vinyl toluene 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, 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, oily ones can be used, but curable ones are 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 materials in 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 and fumaric acid. , Ordinary polyvinyl alcohol with various degrees of saponification,
Carboxy-modified, cation-modified and amphoteric polyvinyl alcohols and their derivatives, oxidized starch, cationized starch, etherified starch and other starches, carboxymethyl cellulose, hydroxyethyl cellulose and other cellulose derivatives, polyvinylpyrrolidone, polyvinylpyrrolidone. Dihalide, 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, polyethylene Synthetic polymers such as imines, styrene-butadiene copolymers, conjugated diene-based copolymer latex such as methylmethacrylate-butadiene copolymers, 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 Publication, JP-A-3-281383 publication,
Inorganic binders such as alumina sol and silica sol described in Japanese Patent Application No. 4-240725 or exemplified can be used, 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 branched alkylsulfosuccinate ester salt, a long-chain, preferably a polyalkylene oxide of 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 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-A 1-266537 or the like described or exemplified color pigments, coloring dyes, optical brighteners, and the like,
Sodium hydroxymethanesulfonate, sodium P-toluenesulfinate, etc., as an anti-yellowing agent, a benzotriazole compound having a hydroxy-di-alkylphenyl group at the 2-position as an ultraviolet absorber, an antioxidant, etc. As a pencil writing agent such as the polyhindered phenol compounds described or exemplified in 105245, starch particles, barium sulfate, silicon dioxide, and other organic or inorganic fine particles having a particle diameter of 0.2 to 5 μm, Japanese Patent Publication No. 4-1337. An organopolysiloxane compound described or exemplified in the publications,
As the pH adjusting agent, various additives such as caustic soda, sodium carbonate, sulfuric acid, hydrochloric acid, phosphoric acid, citric acid, octyl alcohol, and silicon-based defoaming agent can be appropriately combined and contained.

[0042]

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.

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 was beaten to a fiber length of 0.6 mm, and then 100 parts by weight of pulp. 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. A fluorescent whitening agent, 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 The length-weighted average fiber length measured by a Kajaani FS-100 model in accordance with "Paper and Pulp Fiber Length Test Method". 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 3 stages of wet press where the line pressure was adjusted in the range of 0 kg / cm, it was treated with a smoothing roll, and 2 stages of line pressure where the line pressure was adjusted in the range of 30 to 70 kg / cm in the subsequent drying part. After pressing, it was dried. Then, in the middle of drying, 25 g / size-pressing 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. m ² size was pressed, the finally obtained base paper moisture is dried to be 8 wt% in absolute dry moisture, temperature 0.99 ° C. after machine calendered at a linear pressure of 70 kg / cm, linear pressure 150 kg / cm Thermal calendering under conditions of 170g / m ² basis weight and film thickness unevenness index Rpy of 140
A base paper for an imaging material support having a mV was produced.

Next, after the corona discharge treatment was applied to the base paper surface (rear surface) opposite to the side on which the image forming layer was coated, the 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 using a kneading extruder. A polyethylene resin composition comprising the above compound resin was melt-extruded 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 a cooling roll, a cooling roll roughened by a liquid honing method, which has a roughness degree designed to have a center surface average roughness SRa of the back resin layer surface of 1.3 μm, is used. It was operated at a water temperature of 12 ° C.

Subsequently, the surface of the base paper was subjected to corona discharge treatment, and the following polyethylene resin compositions (Examples 1 to 5 and Comparative Examples 1 to 9) were applied to the surface at a resin temperature of 320 ° C. for 32 μm.
Melt extrusion coating was carried out at a resin thickness of m 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 carried out by a so-called tandem system 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 (M1 to M8) shown in Table 1 used to form the polyethylene resin compositions for the surface resin layer (Examples 1 to 5 and Comparative Examples 1 to 9) are as follows. is there.

As the polyethylene resin (M1 to M8),
An ethylene / butene-1 copolymer was produced according to the method described in JP-A-3-502710.

The polyethylene resins (Z1 to Z8) produced by using a polymerization catalyst other than metal metallocene were produced by the Ziegler method.

As the polyethylene resin composition for the surface resin layer, the following (Examples 1 to 5 and Comparative Examples 1 to 9) were used.

As a polyethylene resin composition (Example 1), 44.75 parts by weight of a polyethylene resin (M6) and 44.75 parts by weight of a polyethylene resin (Z2) were used, and aluminum hydroxide was contained (Al ₂ O _{3 with} respect to titanium dioxide). The polyethylene resin composition shown in Table 2 consisting of 10 parts by weight of anatase type titanium dioxide pigment surface-treated with 0.75% by weight) and 0.5 part by weight of zinc stearate.

As a polyethylene resin composition (Example 2), 44.75 parts by weight of polyethylene resin (M7) and 44.75 parts by weight of polyethylene resin (Z1), 10 parts by weight of the above anatase type titanium dioxide pigment, zinc stearate 0 .5 parts by weight of the polyethylene resin composition described in Table 2.

As a polyethylene resin composition (Example 3), 44.75 parts by weight of polyethylene resin (M8) and 44.75 parts by weight of polyethylene resin (Z1), 10 parts by weight of the above anatase type titanium dioxide pigment, zinc stearate 0 .5 parts by weight of the polyethylene resin composition described in Table 2.

As a polyethylene resin composition (Example 4), 53.7 parts by weight of a polyethylene resin (M5) and 35.8 parts by weight of a polyethylene resin (Z1), 10 parts by weight of the above anatase type titanium dioxide pigment, zinc stearate 0 .5
The polyethylene resin composition described in Table 2 which is composed of parts by weight.

As a polyethylene resin composition (Example 5), 22.375 parts by weight of polyethylene resin (M6) and 67.125 parts by weight of polyethylene resin (Z2), 10 parts by weight of the above anatase type titanium dioxide pigment, zinc stearate 0. .5 parts by weight of the polyethylene resin composition described in Table 2.

As a polyethylene resin composition (Comparative Example 1), a polyethylene resin (Z5) (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 2), 44.75 parts by weight of polyethylene resin (M4) and 44.75 parts by weight of polyethylene resin (Z8), 10 parts by weight of the above anatase type titanium dioxide pigment, zinc stearate 0 .5 parts by weight of the polyethylene resin composition described in Table 2.

As a polyethylene resin composition (Comparative Example 3), 44.75 parts by weight of a polyethylene resin (M3) and 44.75 parts by weight of a polyethylene resin (Z7), 10 parts by weight of the above anatase type titanium dioxide pigment, zinc stearate 0 .5 parts by weight of the polyethylene resin composition described in Table 2.

As a polyethylene resin composition (Comparative Example 4), 44.75 parts by weight of polyethylene resin (M5) and 44.75 parts by weight of polyethylene resin (Z5), 10 parts by weight of the above anatase type titanium dioxide pigment, zinc stearate 0 .5 parts by weight of the polyethylene resin composition described in Table 2.

As a polyethylene resin composition (Comparative Example 5), 44.75 parts by weight of polyethylene resin (M8) and 44.75 parts by weight of polyethylene resin (Z4), 10 parts by weight of the above anatase type titanium dioxide pigment, zinc stearate 0 .5 parts by weight of the polyethylene resin composition described in Table 2.

As a polyethylene resin composition (Comparative Example 6), 44.75 parts by weight of a polyethylene resin (M7) and 44.75 parts by weight of a polyethylene resin (Z3), 10 parts by weight of the above anatase type titanium dioxide pigment, zinc stearate. The polyethylene resin composition described in Table 2 which comprises 0.5 part by weight.

As a polyethylene resin composition (Comparative Example 7), 44.75 parts by weight of a polyethylene resin (M1) and 44.75 parts by weight of a polyethylene resin (Z6), 10 parts by weight of the above anatase type titanium dioxide pigment, zinc stearate 0 .5 parts by weight of the polyethylene resin composition described in Table 2.

As a polyethylene resin composition (Comparative Example 8), 67.125 parts by weight of a polyethylene resin (M5) and 22.375 parts by weight of a polyethylene resin (Z1), 10 parts by weight of the above anatase type titanium dioxide pigment, zinc stearate 0 .5 parts by weight of the polyethylene resin composition described in Table 2.

As a polyethylene resin composition (Comparative Example 9), a polyethylene resin (M5) (89.5 parts by weight), anatase type titanium dioxide pigment (10 parts by weight), and zinc stearate (0.5 parts by weight) were used. Resin composition.

Further, the back resin layer surface of the resin-coated paper was subjected to corona discharge treatment, and then the following back coat coating liquid was applied on-machine. As a dry weight, a backcoat coating liquid comprising colloidal silica: styrene latex = 1: 1 and further containing a suitable amount of a coating aid such as sodium polystyrene sulfonate 0.021 g / m ² in latex content (solid content). (By weight calculation)
And a coating amount of 0.21 g / m ² was applied to obtain a support for image material.

As described above, the moldability of the polyethylene resin composition for the surface resin layer when the resin-coated paper-type image material support was produced, and the performance of the obtained sample as an image material support The evaluation method was as follows.

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 evaluated comprehensively. The evaluation criteria are ⊚: extremely good, ◯: good, Δ: somewhat bad but practically no problem, and x: bad and practically problematic to some extent.

As a method for evaluating the uneven peeling, the surface state of the mirror surface on the front side of the image material support was obliquely observed for the sample 6 hours after the start of the production of the image material support under the above-mentioned production conditions. The degree of occurrence of peeling unevenness was visually judged. As an evaluation standard for 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. ×: Peeling unevenness is large, and there are some practical problems.

The film forming of the image forming layer of the support for image materials 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 /
The optimum sensitivity of AgI = 95 / 4.5 / 0.5 (mol%) having a halogen composition of 0.6 μm and an average particle size of 0.6 μm was virtually sensitized by sulfur sensitization and gold sensitization. 0]
Including a neutral-type silver halide photographic emulsion consisting of a surface, and in addition to gelatin necessary for film formation, an appropriate amount of stabilizer, sensitizing dye, coating aid, hardener, optical brightener, thickener, Including filter dyes, silver nitrate 2.2g / m ² and gelatin 4.4g / m ²
Was applied in multiple layers together with the protective layer at a coating amount corresponding to. The protective layer contains a coating aid and a hardener in addition to gelatin equivalent to ² g / m ² .

The coated and dried sample was kept at 35 ° C. under normal humidity at 1
After being stored for a day, the sample was developed with D-72 developer for 90 seconds, and the surface of the emulsion surface was scratched with nails at intervals of 1 cm vertically and horizontally to make a grid-like scratch, and then the surface was surfaced with running fingertips under running water. Rub,
The degree of peeling of the photographic emulsion layer was evaluated. As 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, With film, there is no problem in practical use, x: Exfoliation of the photographic emulsion layer is large, and with film is practically problematic.

The results obtained are shown in Table 3.

[0071]

[Table 1]

[0072]

[Table 2]

[0073]

[Table 3]

From the results shown in Table 3, in the support for image material coated with the resin layer composed of the resin composition containing polyethylene resin as the main component, the polyethylene resin in the resin composition contained the metal metallocene polymerization catalyst. From a polyethylene resin having an MFR of 5 g / 10 minutes or more produced by polymerization and a polyethylene resin having an MFR of 0.3 g / 10 minutes or less produced by polymerization using a metal polymerization catalyst other than the metal metallocene polymerization catalyst. And a support for an image material in the present invention coated with a surface resin layer having a Mw / Mn of a polyethylene resin component of 5 or more in the resin composition (Examples 1 to 5)
Is an excellent support for image materials, in which the molding processability of the polyethylene resin composition is good, peeling unevenness does not occur, the smoothness is good, and the film formation of the photographic emulsion layer is good. I understand well. Further, in the surface resin layer, the content of the polyethylene-based resin polymerized and produced using the metal metallocene polymerization catalyst is 30% by weight or more, and the Mw / Mn of the polyethylene-based resin component in the resin composition is 7.0 or more. The coated support for image materials in the present invention (Examples 2 and 3) has extremely good moldability of the polyethylene resin composition, no uneven peeling, and good smoothness. And the film of the photographic emulsion layer is good,
It can be seen that it is a particularly excellent support for image materials.

On the other hand, samples other than the present invention (Comparative Examples 1 to 9)
It can be seen that each has a problem. In the case of using a resin composition containing as a main component only a polyethylene resin polymerized and manufactured using a conventional metal polymerization catalyst (Comparative Example 1)
Is a problem in that molding processability and uneven peeling are poor, and in the case of using a resin composition containing only a polyethylene resin polymerized and produced using a metal metallocene polymerization catalyst as a main component (Comparative Example 9). Is a problem because the moldability is poor. MF produced by polymerization using a metal metallocene polymerization catalyst
A resin composition containing a polyethylene-based resin having an R of less than 5 g / 10 min and a polyethylene-based resin having an MFR of greater than 0.3 g / 10 min produced by polymerization using a metal polymerization catalyst other than the metal metallocene polymerization catalyst. When used (Comparative Example 2,
The problem 3) is that the occurrence of uneven peeling is poor. Further, it is understood that it is difficult to satisfy the molding processability and the occurrence of peeling unevenness at the same time when the MFR of the polyethylene resin is a combination other than the present invention (Comparative Examples 2 to 7). Furthermore, the MFR polymerized and produced using a metal metallocene polymerization catalyst is 5 g / 10 minutes or more, and the MFR polymerized and produced using a metal polymerization catalyst other than the metal metallocene is 0.3 g / 10 min.
However, when a resin composition having a Mw / Mn of the polyethylene resin component of less than 5 is used (Comparative Example 8), the molding processability is poor and there is a problem, I know there is.

Further, in the same manner as in Examples 1 to 5 and Comparative Examples 1 to 9, a corona discharge was applied to the surface resin surface of the support after the back coat coating liquid was applied and before the resin coated paper was wound up. Treated, lime-processed gelatin 1.5 g, 10% by weight methanol solution of butyl paraoxybenzoate in 0.3
g, 0.45 g of a 5% by weight mixed solution of sulfosuccinic acid-2-ethylhexyl ester salt in methanol and water, and
A 10 wt% aqueous solution of an amphoteric surfactant represented by 0.36
g, and the total amount was adjusted to 100 g with water, and the subbing coating solution was uniformly mixed so that the gelatin coating amount was 0.06 g / m ² .
On-machine coating was performed to obtain a support for image material. The evaluation of the film-attachment of the photographic emulsion layer was carried out on photographic paper having a photographic constituent layer coated on the undercoat layer.

[0077]

[Chemical 1]

The results obtained are shown in Table 4.

[0079]

[Table 4]

From the results shown in Table 4, in the image material support coated with the resin layer composed of the resin composition containing the polyethylene resin as the main component, the polyethylene resin of the resin composition used the metal metallocene polymerization catalyst. M produced by polymerization
A resin composition comprising a polyethylene resin having an FR of 5 g / 10 minutes or more and a polyethylene resin having an MFR of 0.3 g / 10 minutes or less produced by polymerization using a metal polymerization catalyst other than the metal metallocene polymerization catalyst. A support for an image material according to the present invention, which is coated with a surface resin layer in which Mw / Mn of a polyethylene resin component in the product is 5 or more, and which is coated with an undercoat layer on the surface resin layer on machine. (Examples 6 to 1
0) is an excellent support for image materials, in which the molding processability of the polyethylene resin composition is good, peeling unevenness does not occur, the smoothness is good, and the film formation of the photographic emulsion layer is extremely good. You can see that it is the body.

On the other hand, samples other than the present invention (Comparative Examples 10 to 1)
In 8), although the photographic emulsion layer has a good filming property, the polyethylene resin composition is poor in moldability and the degree of uneven peeling is poor, which is a problem.

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 5 and Comparative Examples 1 to 9 were obtained in the same manner as in Examples 1 to 5 and Comparative Examples 1 to 9 except that a commercially available color developer was used instead of the 72 developer. It was

The silver halide color photographic constituent layers include 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 ray containing an ultraviolet absorber. It consists of an absorption layer, a red-sensitive emulsion layer containing a cyan color coupler and a protective layer, and the total amount of gelatin is 8 g / m ²
contains. Each color-sensitive emulsion layer contains silver chlorobromide equivalent to 0.6 g / m ² in terms of silver nitrate, and 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 filters
Including dyes.

Further, Examples 6 to 10 and Comparative Examples 10 to 10
An ink jet image receiving material was prepared by coating the following ink jet image receiving layer on the image material support used in Nos. 13 and 16 instead of the silver halide black and white photographic constituent layers. 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 / cm ² and formed.

[0086]

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 City, Okayama Prefecture Mitsubishi Kasei Co., Ltd. Mizushima Plant (72) Inventor Takuya Seri 3-10 Shiodori, Kurashiki City, Okayama Prefecture Address Mitsubishi Kasei Co., Ltd. Mizushima Plant (56) Reference JP-A-4-143748 (JP, A) JP-A-5-66519 (JP, A) JP-A-3-502710 (JP, A) International Publication 92 / 017538 (WO, A1) (58) Fields investigated (Int.Cl. ⁷ , DB name) G03C 1/79 G03C 1/91 B41M 5/00

Claims (5)

(57) [Claims] 1. A support for an image material, comprising paper as a substrate, and the paper substrate surface on one side where the image forming layer is provided is covered with a resin layer made of a resin composition containing a polyethylene resin as a main component. The polyethylene resin in the resin composition was polymerized and produced using a metal metallocene polymerization catalyst, JI
The melt flow rate specified by SK 6760 is 5
g / 10 min or more polyethylene resin and Ziegler method
Or JISK produced by polymerization using the Phillips method
Melt flow rate specified by 6760 is 0.3g / 10
A support for an image material, comprising a polyethylene-based resin having a content of 5 minutes or less, and having an Mw / Mn (here, Mw: weight average molecular weight, Mn: number average molecular weight) of 5 or more. 2. The content of the polyethylene resin polymerized and produced by using the metal metallocene polymerization catalyst in the resin composition is
The support for image materials according to claim 1, which is 30% by weight or more based on the total polyethylene resin in the resin composition. 3. The Mw / Mn is 7.0 or more.
Alternatively, the support for an image material according to item 2. 4. A support for an image material according to claim 1, which has an undercoat layer on the resin layer. 5. The support for image materials according to claim 1, 2, 3 or 4, wherein the image forming layer is a photographic constituent layer.