JP2001083660A - Production of support for image material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a support for an image material which is very excellent in image quality and suppresses the edge stain after a series of photographic processing steps. SOLUTION: Base paper made using a pulp slurry containing 0.5-2.5 wt.% cationized starch based on the amount of pulp having 0.50-0.75 mm weight average fiber length is applied to obtain the support for an image material. When cationized starch having >=0.20% nitrogen content is used, the support having much better said characteristics is obtained. In order to attain higher- speed production, base paper is made using a hybrid former or a gap former with a dehydrating shoe having a pressurization adjusting mechanism and the support having much better said characteristics is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a support for an image material. More specifically, the image material provided with an image forming layer on an image material support provided with a water-resistant coating layer on both sides of a base paper, for example, the surface quality of photographic paper is remarkably improved. The present invention also relates to a method for producing a support for an image material in which edge contamination generated after a series of photographic processing steps is remarkably suppressed.

[0002]

2. Description of the Related Art A multilayer silver halide color photographic material using a support for an image material, in particular, a support for a photographic material which is a typical support for an image material (may be simply referred to as photographic paper). In the print image of, has uniform gloss,
There is nothing to satisfy users so that it looks beautiful. In recent years, as the demand for photographic paper has increased, this demand has become increasingly prominent, and at present, manufacturers are also focusing on this.

One of the factors that most greatly affect the quality of a printed image is the surface quality of a support for an image material. Of course, manufacturers have been striving to improve the surface quality of imaging material supports, but in order to respond to the recent severe price reductions, they have increased productivity and reduced costs, and also considered environmental issues. Therefore, although it is known that it has an adverse effect on the surface quality, it is inevitable to take measures to increase the speed, and to reduce the cost, lower the basis weight of the base paper. In fact, it is necessary to focus on the issue of surface quality improvement in the direction of surface quality deterioration, such as weight reduction.

Japanese Patent Application Laid-Open No. 61-284762 discloses a two-wire paper machine in which a wire forming a web of a fourdrinier paper machine and an endless upper wire are provided so as to sandwich the web from above. A method for producing a photographic material support in a mer-type paper machine is disclosed. By using the technique of this publication, the dewatering property of the wet paper web on the wire was improved as compared with a conventional fourdrinier paper machine. Further, the formation was improved as compared with the fourdrinier paper machine, but the improvement effect was not sufficient.

On the other hand, in addition to the problem of "surface quality", photographic paper is subjected to severe chemical liquid processing due to the effect of shortening the time of a series of photographic processing steps accompanying the increase in the speed of an automatic printer which is increasing year by year. As a result, there has been a problem that the commercial value is significantly reduced due to the contamination (usually called edge stain) of the edge caused by the penetration of the chemical solution from the edge of the photographic paper. In addition, appropriate rigidity is required from the viewpoint of processing suitability such as bundling and sorting the developed photographic paper into a plurality of sheets, and further, the texture when holding.

[0006] Concerning the improvement of edge stain, for example, JP-A-54-147211 discloses a method for producing paper in which epoxidized higher fatty acid amide and alkali ketene dimer are contained in paper. However, in this method, although the improvement of edge stain is certainly recognized, the addition amount of the epoxidized higher fatty acid amide and the alkali ketene dimer increases, and the dryer section becomes dirty at the time of production and defects occur on paper. Problems occur. In addition, in order to improve the yield of the epoxidized higher fatty acid amide and the alkali ketene dimer, a cationic fixing agent and a retention enhancer of a polymer are used in combination. It tends to impair the quality of photographic paper.

[0007] As described above, from the viewpoint of the method of manufacturing the base paper used for the support for image materials, it is necessary to improve the surface quality of the support for image materials under increased speed and suppress the generation of edge stain. None of the properties were comprehensively improved.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an image material having an image forming layer provided on a support for an image material having a water-resistant coating layer provided on both sides of a base paper, for example, photographic paper. It is an object of the present invention to provide a method for producing a support for an image material, in which the number of stains on the edge generated after a series of photographic processing steps is markedly improved.

[0009]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned drawbacks, and as a result, have come to invent a method of manufacturing a support for an image material of the present invention. That is,

[0010] 1. In the present invention, the weight average fiber length is 0.50
The present invention provides a method for producing a support for an image material, wherein a base paper is formed by adding 0.5 to 2.5% by weight of a cationized starch to a pulp to a pulp of 0.75 mm.

2. The invention of the above invention 1 is a method for producing a support for an image material, wherein the cationized starch has a nitrogen content of 0.20% or more.

3. In the above inventions 1 and 2,
A method for producing a support for an image material, comprising forming a base paper using a hybrid former or a gap former provided with a dehydration shoe having a pressure adjusting mechanism.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the method for producing a support for an image material of the present invention will be described in detail.

The present inventors have remarkably improved the surface quality of a support for an image material, particularly a support for a photographic material, which is a typical support for an image material, for example, a photographic paper, and held in a hand. The present invention has succeeded in providing a method for producing a support for an image material, which sometimes has stiffness and significantly suppresses stains on edges generated after a series of photographic processing steps.

Usually, a photographic material support, which is a typical support for image materials, has a water-resistant coating layer such as a thermoplastic resin on the side of the base paper on which the image forming layer is provided (front side) and on the back side of the base paper. And a resin layer containing Thereafter, on the side on which the image forming layer is provided, a multilayer silver halide color photographic emulsion or the like is applied to obtain a printing paper, and a print image is obtained through a series of photographic processing steps. Therefore, the quality of the surface that most affects the quality of the printed image must be improved retroactively to the surface quality of the support for the image material and further to the formation (surface quality) of the base paper. If the texture of the base paper is poor, the surface quality of the support for image materials will naturally deteriorate, and the surface quality of the photographic paper will inevitably deteriorate, and the print image will only be extremely unsatisfactory. Become.

The present inventors have studied how to form the base paper with high productivity. First, the present inventors examined the dispersibility of the pulp fibers constituting the base paper in the pulp slurry. Generally, paper having a basis weight of 80 to 180 g / m2 is used as a base paper of photographic paper. When such a basis weight is formed by a paper machine,
The pulp slurry concentration of the head box is 0.7-1.
It has a relatively high concentration of about 2%. In such a high concentration region, the dispersion of pulp fibers can be improved by reducing the number of collisions (number of entanglements) between pulp fibers in the pulp slurry. For example, JP-A-8-82891
In, from the viewpoint of the surface quality and strength of the photographic paper, by setting the weight average fiber length of the pulp fiber to 0.4 mm to 0.8 mm, it is possible to produce a photographic paper with a balance of surface quality and strength, more preferably Recommends that pulp fibers having a weight average fiber length of 0.50 mm to 0.65 mm be used as a raw material. However, when the fiber length is actually shortened in this way, (1) the freeness is reduced, the dewatering property in the wire part is poor, the paper is broken in the press part, and the formation is worsened. 2) Since the fiber length is short, there is a problem in that the strength is reduced and the paper is cut off during production and in the photographic processing step.

As a result of intensive studies to solve this problem, the present inventors have found that the above-mentioned problems cannot be solved only by controlling the fiber length of pulp or by a beating method, and a fiber having good dispersibility can be obtained. It has been found that it is important to control the length and to use a dehydration aid and a strength aid in combination. The cationized starch appropriately agglomerates the fibers without impairing the formation, assists dehydration on the wire, and also acts as a strength auxiliary by being contained in the paper. Furthermore, the cationized starch simultaneously satisfies the effect of assisting the yield of epoxidized higher fatty acid amides for preventing edge stain and alkali ketene dimer.

That is, the pulp fiber length is 0.50 mm to 0.1 mm.
A pulp slurry is prepared by adding 0.5 to 2.5% by weight of cationized starch to pulp to a pulp fiber having a length of 75 mm.
A cationized starch having a nitrogen content of 0.20% or more is added to a pulp fiber having a nitrogen content of 0.20% or more.
It has been found that by performing papermaking using a pulp slurry to which 5 to 2.5% by weight is added, it is possible to provide a photographic paper having a good texture, a small edge stain, and a good texture.

If the fiber length of the pulp fiber is less than 0.50 mm, the freeness of the pulp will be low, and the dewatering in the wire part will not be sufficient, which will worsen the formation. On the other hand, if the fiber length of the pulp is longer than 0.75 mm, the fibers are not sufficiently dispersed in the pulp slurry, and the formation deteriorates.

When the amount of the cationized starch added to the pulp slurry is less than 0.5% by weight based on the pulp, coagulation of the pulp fibers in the pulp slurry is not sufficient, and the freeness is low.
Good formation cannot be obtained. Also, the edge stain and texture of the formed paper are not sufficient. On the other hand, the amount of the cationized starch added to the pulp slurry was 2.5% by weight based on the pulp.
If the amount is larger than the above, the texture of the photographic paper thus produced is sufficient, but the charge balance in the slurry is lost during papermaking, and conversely, the drainage becomes low and good formation cannot be obtained. Also, when the epoxidized higher fatty acid amide and the alkali ketene dimer are used in combination, the yield of these chemicals is rather deteriorated, and the edge stain is deteriorated.

By adding a cationized starch having a nitrogen content of 0.20% or more, the wire part can be reduced in a relatively small amount as compared with a case where a cationized starch having a nitrogen content of less than 0.20% is used. When the epoxidized higher fatty acid amide and the alkali ketene dimer are used in combination, the yield of these chemicals is improved, and paper with less edge stain can be produced.

As described above, the pulp fiber length is 0.5
Papermaking is performed by using a pulp slurry in which cationized starch is added to pulp fibers in a range of 0 mm to 0.75 mm with respect to pulp in an amount of 0.5 to 2.5% by weight, more preferably a pulp fiber length of 0.50 mm to 0%. Good formation by using a pulp slurry obtained by adding a cationized starch having a nitrogen content of 0.20% or more to pulp to 0.5 to 2.5% by weight of pulp fibers in a range of 0.75 mm. Thus, it is possible to provide a photographic paper having a texture with little edge stain.

When the speed of the paper machine is further increased, specifically, when the speed of the paper machine is 250 m / min or more, the dewatering property in the wire part is relatively low even by using the above-mentioned manufacturing method. It becomes sufficient, and the amount of water brought in after the press part increases, and the wet paper breaks in the press part, resulting in poor formation and surface quality. In such a case, the aggregation of the pulp fiber can be promoted by adding a high-molecular-weight synthetic polymer or the like, but the formation deteriorates and good surface quality cannot be obtained. On the other hand, Japanese Patent Application Laid-Open No. 61-284762 discloses a two-wire paper machine in which a wire forming a web of a fourdrinier paper machine and an endless upper wire are provided so as to sandwich the paper web from above, a so-called hybrid former. Even when making a paper using a paper machine of the type, it is necessary to sufficiently dehydrate the fourdrinier portion.

Therefore, the present inventors prepared a pulp slurry in which cationized starch was added to pulp having a weight average fiber length of 0.50 to 0.75 mm and 0.5 to 2.5% by weight of pulp. By forming a base paper using a hybrid former or a gap former equipped with a dehydration shoe with a pressure adjustment mechanism, a base paper with good formation can be formed at high speed and the surface quality is good. Thus, it was found that photographic paper having a texture with little edge stain can be manufactured.

Here, a conventional hybrid former type paper machine without a pressure adjusting mechanism and a hybrid former or a gap former with a dehydrating shoe having a pressure adjusting mechanism used in the present invention are described below. Briefly describe. Dehydration shoes of conventional hybrid formers and gap formers are mostly fixed types, and the dehydration shoes are arranged on a curved surface having a constant curvature to obtain dehydration pressure. For a hybrid former or a gap former provided with a dehydration shoe having a pressure adjusting mechanism used in the present invention, a dehydration shoe fixed to one of the arrays is arranged across a wire,
Dehydration shoes having a pressure adjusting mechanism capable of controlling the pressure applied to the wire in the opposite direction are arranged to face each other. In this method, the dewatering pressure can be controlled by controlling the pressure applied to the wire. Furthermore, by passing the formation of the wet paper determined in the first half of the wire through the dehydration shoe sections arranged opposite to each other, the formation is adjusted again by the pressure fluctuation of the dehydration shoe section, and a good formation is obtained. The base paper was obtained.

Further, by using a dehydration shoe having a pressure adjusting mechanism, the dehydration efficiency in the wire part is increased and a dehydration profile in the width direction is easily obtained, as compared with a former using a fixed type sole shoe. became.
As a result, the amount of water carried into the press section is reduced, and the wet paper web squeezing rate in the press section is increased. At the same time, the wet paper web is not crushed by pressure in the press section, and the formation of the base paper in the width direction is prevented. (Surface quality) is improved. By using a hybrid former or a gap former equipped with a dehydration shoe having a pressure adjusting mechanism used in the present invention, the dewatering property in the wire part is increased, and the papermaking speed for producing a base paper of a support for an image material is increased. Also 250-400m / min
Up to 60% by further studying the formulation of papermaking chemicals.
It is considered possible to increase the papermaking speed to 0 m / min.

The support for an image material of the present invention thus produced has good dewatering properties even in high-speed papermaking, has good formation, and has relatively high rigidity, so that it is possible to reduce the basis weight. Since the base paper has a good formation (surface quality), the surface quality of the support for the image material can be maintained in a good state even if the surface resin layer is reduced. Can be. Furthermore, since the resin layer on the back side can also reduce the thickness of the resin in order to maintain the curl balance, it leads to a reduction in the total amount of resin used for the support for the image material, and due consideration has been given to environmental issues. Provide support for image materials.

To summarize the above, in order to produce a support for an image material having a good surface quality, it is first necessary to produce a base paper having a good formation. In order to produce a good base paper, the fiber length of the fibers constituting the base paper is set in a specific range, specifically, the weight average fiber length is 0.50 to 0.75 m.
It is necessary to make a paper using m pulp fibers. When using a pulp with such a short weight average fiber length to produce a high basis weight base paper, dehydration at the wire part becomes a problem, and at the same time, the stiffness decreases, and the stiffness decreases. Texture is impaired. As a means for solving this problem, cationized starch is added to pulp in an amount of 0.5 to 2.5.
%, More preferably 0.2% by weight of nitrogen.
By producing a base paper by adding 0.5% to 2.5% by weight of cationized starch to pulp with respect to pulp, an image material having good surface quality, little edge stain in the photographic processing step, and good texture Support can be provided. However, in order to manufacture the base material for the image material support of the present invention at higher speed and more efficiently, it is necessary to manufacture using a hybrid former or a gap former equipped with a dehydration shoe having a pressure adjusting mechanism. Was achieved.

The base paper used in the practice of the present invention is preferably a natural pulp paper mainly composed of ordinary natural pulp. Further, a mixed paper made of natural pulp as a main component and synthetic pulp and synthetic fiber may be used. Examples of such natural pulp include JP-A-58-37642 and JP-A-60-67.
It is advantageous to use appropriately selected natural pulp as described or exemplified in JP-A-940, JP-A-60-69649, JP-A-61-35442 and the like. Natural pulp was subjected to normal bleaching treatment of chlorine, hypochlorite, chlorine dioxide bleaching and alkali extraction or alkali treatment and, if necessary, oxidative bleaching treatment with hydrogen peroxide, oxygen, etc., and a combination treatment thereof Wood pulp of softwood pulp, hardwood pulp, and softwood pulp mixed pulp is advantageously used, and various pulp such as kraft pulp, sulfite pulp, and soda pulp can be used.

As the raw material of the cationized starch used in the practice of the present invention, those using potatoes, corn, waxy corn, rice, etc. of the rhizome can be used. As the cationic group introduced into the starch,
Tertiary and quaternary cationic groups can be introduced.
Further, an amphoteric starch into which both an anionic group and a cationic group are introduced can be used. The nitrogen content of the cationized starch used in the practice of the present invention is measured by the following procedure and is mainly derived from the cationic groups introduced into the starch. The nitrogen content of the cationized starch used in the practice of the present invention was measured by a total nitrogen analyzer ("TOTA" manufactured by Mitsubishi Chemical Corporation).
L NITROLOGEN ANALYZER TN-1
The amount of nitrogen is measured using "type 0") and expressed as a percentage of the amount of nitrogen relative to the absolute dry solid content of the cationized starch.

The base paper mainly composed of natural pulp used in the practice of the present invention can contain various additives during preparation of the stock slurry. As a sizing agent, dry paper such as fatty acid metal salts or fatty acids, alkyl ketene dimer emulsions or epoxidized higher fatty acid amides, alkenyl or alkyl succinic anhydride emulsions described in or exemplified in JP-B-62-7534, rosin derivatives, etc. As a force enhancer, anionic, cationic or amphoteric polyacrylamide, polyvinyl alcohol, vegetable galactomannan, etc., as a wet paper strength enhancer, polyamine polyamide epichlorohydrin resin, etc., as a filler, clay, kaolin, calcium carbonate, titanium oxide Water-soluble aluminum salts such as aluminum chloride and bansulfuric acid as fixing agents; caustic soda, sodium carbonate, sulfuric acid and the like as pH regulators;
No. 51, Japanese Unexamined Patent Publication No. 1-266537, etc., or the coloring pigments, coloring dyes, fluorescent brightening agents and the like described or exemplified in the above can be appropriately combined and contained.

A composition comprising various water-soluble polymers or hydrophilic colloids or latexes, an antistatic agent, and additives in or on a base paper mainly composed of natural pulp used in the practice of the present invention. Can be contained or applied by a size press, a tab size press, a blade coating, an air knife coating or the like. As a water-soluble polymer or hydrophilic colloid, starch-based polymers, polyvinyl alcohol-based polymers, gelatin-based polymers, polyacrylamide-based polymers, cellulose-based polymers, etc. described or exemplified in JP-A-1-26637, emulsions and latexes, Petroleum resin emulsion, JP 55
JP-A-4027, JP-A-1-108538 or an emulsion or latex of a copolymer containing at least ethylene and acrylic acid (or methacrylic acid) as constituents or styrene-butadiene,
Styrene-acrylic, vinyl acetate-acrylic, ethylene-vinyl acetate, butadiene-methyl methacrylate-based copolymers and emulsions or latexes of their carboxy-modified copolymers, as an antistatic agent,
Alkali metal salts such as sodium chloride and potassium chloride; 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, etc., as pigments, clay, kaolin, calcium carbonate, talc, barium sulfate, titanium oxide, etc .;
It is advantageous to incorporate phosphoric acid, citric acid, caustic soda and the like, and the above-mentioned additives such as coloring pigments, coloring dyes and fluorescent brighteners in an appropriate combination.

The side (front side) where the image forming layer of the base paper of the image material support in the present invention is provided is covered with a resin layer containing a thermoplastic resin. The back side of the base paper is preferably covered with a resin layer containing a thermoplastic resin. As the thermoplastic resin fat, resins such as polyolefin resin, polycarbonate resin, polyester resin, polyamide resin and a mixture thereof are preferable. Among them, from the viewpoint of melt extrusion coating properties, the above-mentioned polyolefin resin and / or polyester resin is preferable. More preferred are polyethylene resins. Further, it may be covered with a resin layer composed of an electron beam curable resin described or exemplified in JP-B-60-17104.

The polyethylene resins for the front resin layer and the back resin layer preferably used in the practice of the present invention include:
Low-density polyethylene resin, medium-density polyethylene resin, high-density polyethylene resin, linear low-density polyethylene resin, ultra-low-density polyethylene resin, ethylene and propylene, copolymers of α-olefins such as butylene, ethylene and acrylic acid, Ethyl acrylate, copolymers such as maleic anhydride, or graft copolymers, so-called carboxy-modified polyethylene resins, etc., and polyethylene based by high-pressure radical polymerization using an autoclave reactor, tubular reactor, etc. Examples include resins, polyethylene resins produced by polymerization using a metallocene polymerization catalyst, polyethylene resins produced by polymerization using a metal catalyst other than metallocene by Ziegler method, Phillips method, and the like, and mixtures thereof. As the polyethylene resin and the mixture, those having various densities, melt flow rates (hereinafter, the melt flow rate defined by JIS K 6760 is simply abbreviated as MFR), molecular weights, and molecular weight distributions are used alone or as a mixture. Can be used.

The polyethylene resin polymerized and produced by the high pressure method preferably used for the surface resin layer in the practice of the present invention includes long chain branching by a high pressure production method using an autoclave type reactor, a tubular type reactor, or the like. And various polyethylene resins having Examples of polyethylene resins polymerized and produced by these high-pressure methods include low-density polyethylene resins, medium-density polyethylene resins, propylene containing ethylene as a main component, copolymers with α-olefins such as butylene, carboxy-modified polyethylene resins, and the like. These are mixtures of various densities, MFRs, molecular weights,
Those having a molecular weight distribution can be used alone or in combination of two or more.

Examples of the polyethylene resin produced by polymerization using a metallocene polymerization catalyst particularly preferably used for the surface resin layer in the practice of the present invention include JP-A-3-502710, JP-A-60-35006, Tokuyo Sho 63-5
No. 01369, JP-A-3-234717, JP-A-3-234718, etc., the catalytic activity of a combination of a metallocene such as a zirconium or hafnium and preferably a methylaluminoxane is disclosed. The polymer was produced by polymerization using a polymer having a higher value as a polymerization catalyst. Polyethylene resins produced by polymerization using these metallocene polymerization catalysts include ultra-low-density polyethylene resin, low-density polyethylene resin, medium-density polyethylene resin, high-density polyethylene resin, linear low-density polyethylene resin, and ethylene as the main components. Propylene, a copolymer with an α-olefin such as butylene, a carboxy-modified polyethylene resin and the like, and mixtures thereof, with various densities, MFR, molecular weight,
Those having a molecular weight distribution can be used alone or in combination of two or more.

As the polyethylene resin produced by polymerization using a metal polymerization catalyst other than the metallocene polymerization catalyst particularly preferably used for the surface resin layer in the practice of the present invention, for example, the polyethylene resin produced by polymerization using Ziegler method, Phillips method or the like is used. Various polyethylene resins can be mentioned. Polyethylene resins produced by polymerization using metal polymerization catalysts other than those metallocene polymerization catalysts include ultra-low-density polyethylene resin, low-density polyethylene resin, medium-density polyethylene resin, high-density polyethylene resin, and linear low-density polyethylene. Resins, propylene containing ethylene as a main component, copolymers with α-olefins such as butylene, or carboxy-modified polyethylene resins and the like, and mixtures thereof. Those having various densities, MFRs, molecular weights, and molecular weight distributions can be used alone. Alternatively, two or more kinds can be used in combination.

As the polyethylene resin for the back resin layer used in the practice of the present invention, a compound resin prepared by melting and mixing in advance is preferable. As a method for preparing a compound resin by previously melting and mixing a low-density polyethylene resin or a medium-density polyethylene resin and a high-density polyethylene resin, a simple melt mixing method, a multi-stage melt mixing method, or the like can be used. For example, using an extruder, a twin-screw extruder, a heating roll mill, a Banbury mixer, a pressure kneader, and the like, a predetermined amount of low-density or medium-density polyethylene resin and high-density polyethylene resin, and if necessary, an antioxidant A method of adding various additives such as a lubricant, melting and mixing, and then pelletizing the mixture is advantageously used.

The thermoplastic resin in the front resin layer and the back resin layer used in the support for an image material in the present invention is preferably a polyolefin resin, particularly preferably a polyethylene resin. It is manufactured by a so-called melt extrusion coating method in which a resin composition for the front resin layer and the back resin layer is cast into a film from a slit die and coated on a running base paper using a melt extruder. Usually, using a melt extruder on a running base paper, extruding the molten resin composition from the slit die into a film, casting and coating, pressure-bonded between a pressure roll and a cooling roll, It is produced in a series of steps of being separated from the chill roll. At the time of melt extrusion coating, the slit die is preferably a T-type die, an L-type die, or a flat die of a fishtail type die. The slit opening diameter is 0.1 mm to 2 m.
m is desirable.

Various additives can be contained in the front resin layer and, if necessary, in the back resin layer of the support for an image material in the present invention. For the purpose of improving the whiteness of the support and the sharpness of the image, JP-B-60-3430, JP-B-63-11655, and JP-B1-382.
No. 91, Japanese Patent Publication No. 1-38292,
It is preferable to include a titanium dioxide pigment described or exemplified in Japanese Patent No. 105245 or the like. Also, in addition to titanium dioxide, zinc oxide, talc, white pigments such as calcium carbonate, as a releasing agent, stearic acid amide, fatty acid amides such as arachidic amide, as a dispersant and releasing agent for the pigment, zinc stearate, Fatty acid metal salts such as calcium stearate, aluminum stearate, magnesium stearate, zinc palmitate, zinc myristate, calcium palmitate, and the like, hindered phenols, hindered amines, phosphorus compounds, and sulfur described or exemplified in JP-A-1-105245 -Based antioxidants, blue-based pigments and dyes such as cobalt blue, ultramarine, celian blue, and phthalocyanine blue; magenta-based pigments and dyes such as cobalt violet, fast violet, and manganese violet; and JP-A-2-254440. Gazette According or illustrative of the fluorescent brightening agent, various additives as appropriate combination can be incorporated such as an ultraviolet absorber. These additives are preferably contained as a resin masterbatch or compound. Further, from the viewpoint of the sharpness or whiteness of the print or the heat resistance of the image material support, effective improvement of light resistance or release properties, etc., white pigments such as titanium oxide and fluorescent brighteners, coloring pigments and the like. It is preferable to incorporate a coloring dye or other additives such as an antioxidant, an ultraviolet absorber or a release agent at a higher concentration in the uppermost layer than in the lower resin layer. In particular, the content of titanium dioxide pigment in the uppermost layer (as a percentage of the weight in the uppermost layer) is 9% by weight or more, further 12% by weight or more, still more preferably 15% by weight or more, especially 17% by weight or more. Is preferred.

In the practice of the present invention, it is preferable to perform an activation treatment such as a corona discharge treatment or a flame treatment on the base paper before coating the front and back resin compositions on the base paper. Further, as described in JP-B-61-42254, a resin layer may be coated on a running base paper after spraying an ozone-containing gas onto a molten resin composition in contact with the base paper. In addition, the front and back resin layers may be sequentially, preferably continuously, extruded and coated on the base paper by a so-called tandem extrusion coating method.If necessary, the back resin layer may be formed of two or more layers. It may be coated in a multilayer structure. The surface resin layer surface of the image material support has a glossy surface.
It can be processed to a fine rough surface, matte surface or silk surface described in Japanese Patent Application Laid-Open No. 2-19732, and the back resin layer is usually preferably processed to a matte surface.

The coating thickness of the surface resin layer of the image material support in the present invention is useful in the range of 8 to 100 μm, preferably in the range of 12 to 60 μm, and more preferably in the range of 18 to 40 μm.
The range of μm is particularly preferred. Further, a particularly preferred image material support in the present invention, the resin layer is at least a resin layer composed of at least the lowermost layer and a resin layer composed of at least the uppermost layer in the case of a multi-layer structure coated by sequential melt extrusion coating, at least The thickness of the lowermost resin layer is preferably 25% or more, more preferably 39% or more of the total resin layer thickness on the front side, from the viewpoint of improving the apparent glossiness of the image material and its print. The thickness is more preferred, and a thickness of 50% or more is particularly preferred, but is not particularly limited. Also, the back side of the base paper is preferably coated with a back resin layer containing a resin capable of forming a film as a main component, and the resin is preferably a polyethylene-based resin. In particular, it is preferable to set appropriately within a range for obtaining curl balance.
A range of 100 μm is useful, but preferably 12-6.
The range is 0 μm.

The surface of the surface resin layer of the support for an image material according to the present invention is subjected to an activation treatment such as a corona discharge treatment or a flame treatment, and then the methods are described in JP-A-61-84643 and JP-A-1-92740. An undercoat layer described or exemplified in Japanese Patent Application Laid-Open, JP-A-1-102551, JP-A-1-16635 or the like can be applied. Further, on the back resin layer surface of the image material support in the present invention, after performing an activation treatment such as a corona discharge treatment, a flame treatment, various back coat layers are coated for antistatic and the like. Can be. In addition, the back coat layer includes a Japanese Patent Publication No. 52-1.
No. 8020, JP-B-57-9059, JP-B-57-53940, JP-B-58-56859, JP-A-59-214849, JP-A-58-1
84144 and the like or the inorganic antistatic agents described or exemplified, organic antistatic agents, hydrophilic binders, latex,
A curing agent, a pigment, a surfactant and the like can be appropriately combined and contained.

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

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

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

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

The support for an image material in the present invention can be used as a support for various ink jet recording materials provided with various ink image receiving layers. Various binders can be contained in the ink image receiving layer for the purpose of improving the drying property of the ink, the sharpness of the image, and the like. Specific examples of the binder include lime-processed gelatin, acid-processed gelatin, enzyme-processed gelatin, and gelatin derivatives such as various gelatins such as phthalic acid, maleic acid, and gelatin reacted with an anhydride of dibasic acid such as fumaric acid. , Ordinary polyvinyl alcohol of various saponification degrees,
Carboxy-modified, cationic-modified and amphoteric polyvinyl alcohol and their derivatives, starches such as oxidized starch, cationized starch, etherified starch, cellulose derivatives such as carboxymethylcellulose and hydroxyethylcellulose, polyvinylpyrrolidone, polyvinylpyridium halide, polyacryl Synthetic polymers such as acid soda, acrylic acid methacrylic acid copolymer salt, polyethylene glycol, polypropylene glycol, polyvinyl ether, alkyl vinyl ether / maleic anhydride copolymer, styrene / maleic anhydride copolymer and salts thereof, and polyethyleneimine Conjugated diene copolymer latex such as styrene-butadiene copolymer, methyl methacrylate-butadiene copolymer, polyvinyl acetate, vinyl acetate
Vinyl acetate polymer latex such as maleic acid ester copolymer, vinyl acetate / acrylic acid ester copolymer, ethylene / vinyl acetate copolymer, acrylic acid ester polymer, methacrylic acid ester polymer, ethylene / acrylic acid ester Acrylic polymer or copolymer latex such as copolymer, styrene / acrylate copolymer, vinylidene chloride copolymer latex or functional group-containing monomer such as carboxyl group of these various polymers Aqueous adhesives such as thermosetting synthetic resin such as functional group-modified polymer latex, melamine resin and urea resin, and polymethyl methacrylate, polyurethane resin, unsaturated polyester resin, vinyl chloride / vinyl acetate copolymer, polyvinyl butyral, and alkyd Synthetic resin adhesive such as resin, -24906, JP-A No. 3-
Inorganic binders such as alumina sol, silica sol and the like described or exemplified in Japanese Patent Application No. 281383 and Japanese Patent Application No. 4-240725 can be used alone or in combination.

The ink receiving layer of the ink jet recording material according to the present invention may contain various additives in addition to the binder. For example, as a surfactant, an anionic surfactant such as a long-chain alkyl benzene sulfonate, a long-chain, preferably a branched alkyl sulfosuccinate, a polyalkylene oxide of a long-chain, preferably a branched alkyl group-containing phenol. Nonionic surfactants such as ethers and polyalkylene oxide ethers of long-chain alkyl alcohols;
No. 303, U.S. Pat. No. 3,589,906, etc., such as fluorinated surfactants such as .gamma.-aminopropyltriethoxysilane, N-.beta. (Aminoethyl) .gamma.
As a silane coupling agent such as aminopropyltrimethoxysilane, a polymer hardening agent, an active halogen compound, a vinyl sulfone compound, an aziridine compound, an epoxy compound, an acryloyl compound, an isocyanate compound, etc .; 1-1102551
And P-hydroxybenzoic acid ester compounds, benzisothiazolone compounds, and isothiazolone compounds described in JP-A-63-204251, JP-A-1-26637, and the like or the coloring pigments and coloring dyes described or exemplified in Antioxidants such as fluorescent whitening agents, sodium hydroxymethanesulfonate and sodium P-toluenesulfinate as yellowing inhibitors, and benzotriazole compounds having a hydroxy-dialkylphenyl group at the 2-position as ultraviolet absorbers. As an agent, JP-A No. 1-10
No. 5245 or an example of a polyhindered phenol compound such as a polyhindered phenol compound, as a pencil writing agent, an organic or inorganic particle size of starch particles, barium sulfate, silicon dioxide, etc.
2-5 μm fine particles, organopolysiloxane compounds described or exemplified in Japanese Patent Publication No. 4-1337, pH
Caustic soda, sodium carbonate, sulfuric acid, hydrochloric acid,
Various additives such as octyl alcohol and silicon-based antifoaming agents such as phosphoric acid and citric acid can be appropriately combined and contained.

[0050]

The present invention will be described below with reference to examples of the present invention, but the present invention is not limited to these examples. Further, “parts” and “%” shown in Examples are
Unless indicated otherwise, parts by weight and% by weight are indicated.

<Manufacture of base paper> Examples 1-21 and Comparative Examples 1-8 <Manufacture of base paper> A mixed pulp composed of 85% by weight of hardwood bleached kraft pulp and 15% by weight of hardwood bleached sulfite pulp was beaten. Weight average fiber length of pulp (JAPA
N TAPPI Paper Pulp Test Method No. 52-89 "Measured in accordance with the paper and pulp fiber length test method")
After beaten to 0.55 mm, cationized starch having a nitrogen content of 0.30% by weight based on 100 parts by weight of pulp (Neotack # 13, manufactured by Nippon Food Processing Co., Ltd.)
0) was added to 0.50 parts by weight. Incidentally, the nitrogen content of the cationized starch was 0.30%. Further, 0.20 parts by weight of an anionized polyacrylamide and 0.2 of an alkyl ketene dimer emulsion (as a ketene dimer component) were added.
A pulp slurry was prepared by adding 40 parts by weight, 0.40 part by weight of a polyamine polyamide epichlorohydrin resin and appropriate amounts of a fluorescent brightener, a blue dye and a red dye. This was made into a 0.5% by weight pulp slurry, and then the paper width 5
000 mm at a papermaking speed of 200 m / min using a fourdrinier paper machine. The base paper used for the support for image materials produced under the above conditions was impregnated with a size press solution having the following composition by 25 g / m ² by a size press. <Composition of size press liquid> Polyvinyl alcohol (PVA117: manufactured by Kuraray) 3 parts Water 97 parts

As described above, the base paper of Example 1 for a support for an image material having a basis weight of 170 g / m ² was produced.

A base paper of Example 2 was produced under the same conditions as in Example 1 except that the amount of the cationized starch was changed to 1.00 part by weight.

A base paper of Example 3 was produced under the same conditions as in Example 1 except that the amount of the cationized starch was 1.75 parts by weight.

A base paper of Example 4 was produced under the same conditions as in Example 1 except that the amount of the cationized starch was changed to 2.50 parts by weight.

The weight-average fiber length of the pulp after beating is 0.
The base paper of Example 5 was produced under the same conditions as in Example 1 except that it was beaten to 50 mm and the added amount of the cationized starch was 1.75 parts by weight.

The weight-average fiber length of the pulp after beating is 0.
The base paper of Example 6 was produced under the same conditions as in Example 1 except that the paper was beaten to 75 mm and the added amount of the cationized starch was 1.75 parts by weight.

The base paper of Example 7 was prepared under the same conditions as in Example 1 except that 1.75 parts by weight of a cationized starch having a nitrogen content of 0.12% (trade name: CATO302, manufactured by NSC Japan) was added. Was manufactured.

The base paper of Example 8 was prepared under the same conditions as in Example 1 except that 1.75 parts by weight of a cationized starch having a nitrogen content of 0.15% (trade name: CATO 315, manufactured by NSC Japan) was added. Was manufactured.

The base paper of Example 9 was prepared under the same conditions as in Example 1 except that 1.75 parts by weight of a cationized starch having a nitrogen content of 0.22% (trade name: CATO304, manufactured by NSC Japan) was added. Was manufactured.

The base paper of Example 10 was prepared under the same conditions as in Example 1 except that 1.75 parts by weight of a cationized starch having a nitrogen content of 0.22% (trade name: CATO3210, manufactured by NSC Japan) was added. Was manufactured.

Cationized starch having a nitrogen content of 0.24% (trade name: OPTIBOND10, manufactured by NSC Japan)
The base paper of Example 11 was manufactured under the same conditions as in Example 1 except that 1.75 parts by weight of 45) was added.

Cationized starch having a nitrogen content of 0.34% (manufactured by Nippon Food Processing Co., Ltd .: Neotack # 110)
A base paper of Example 12 was produced under the same conditions as in Example 1 except that 1.75 parts by weight of M) was added.

A base paper of Comparative Example 1 was produced under the same conditions as in Example 1 except that the amount of the cationized starch was changed to 0.30 parts by weight.

A base paper of Comparative Example 2 was produced under the same conditions as in Example 1 except that the amount of the cationized starch was changed to 3.00 parts by weight.

The weight-average fiber length of the pulp after beating is 0.
A base paper of Comparative Example 3 was produced under the same conditions as in Example 1 except that the mixture was beaten to 46 mm and the added amount of the cationized starch was 1.75 parts by weight.

The weight-average fiber length of the pulp after beating is 0.
A base paper of Comparative Example 4 was produced under the same conditions as in Example 1 except that the paper was beaten to 80 mm and the added amount of the cationized starch was 1.75 parts by weight.

Cationized starch having a nitrogen content of 0.22% by weight (trade name: CATO304, manufactured by NSC Japan)
Was added under the same conditions as in Example 1 except that 1.75 parts by weight was added and the production was performed using a fourdrinier paper machine at a papermaking speed of 400 m / min.

The base paper of Example 14 was prepared under the same conditions as in Example 1 except that 1.75 parts by weight of the cationized starch was added, and the production was performed using a fourdrinier paper machine at a papermaking speed of 400 m / min. Manufactured.

Cationized starch having a nitrogen content of 0.34% by weight (manufactured by Nippon Food Processing Co., Ltd., trade name: Neotack # 1)
10M) at a papermaking speed of 400 m /
The base paper of Example 15 was manufactured under the same conditions as in Example 1 except that the base paper was manufactured using a fourdrinier paper machine.

The amount of the cationized starch added was 1.75 parts by weight, and the production was performed using a hybrid former (Mitsubishi Heavy Industries: Bellform Former) using a fixed shoe as a dehydrating shoe at a papermaking speed of 400 m / min. A base paper of Example 16 was manufactured under the same conditions as in Example 1 except for the above.

A hybrid former in which 1.75 parts by weight of the cationized starch was added, and a dehydration shoe having a pressure adjusting mechanism and a fixed shoe were arranged as dehydration shoes at a papermaking speed of 400 m / min. A base paper of Example 17 was manufactured under the same conditions as in Example 1 except that it was manufactured using (Duioformer D, manufactured by Ishikawajima-Harima Heavy Industries, Ltd.).

Cationized starch having a nitrogen content of 0.34% by weight (manufactured by Nippon Food Processing Co., Ltd .: Neotack # 1)
10M) at a papermaking speed of 400 m /
Except for using a hybrid former (made by Ishikawajima-Harima Heavy Industries, Ltd .: Deuformer D) in which a dehydration shoe with a pressure adjusting mechanism and a fixed shoe are arranged so as to face each other as a dehydration shoe in minutes. Under the same conditions as in Example 1, the base paper of Example 18 was produced.

The weight-average fiber length of the pulp after beating is 0.
It is beaten to 50 mm, the added amount of the cationized starch is 1.75 parts by weight, and the dehydration shoe with the pressure adjusting mechanism and the fixed shoe are arranged as a dehydration shoe at a paper making speed of 400 m / min. The base paper of Example 19 was manufactured under the same conditions as in Example 1 except that the hybrid paper was manufactured using a hybrid former (manufactured by Ishikawajima-Harima Heavy Industries, Ltd .: Deuformer D).

The weight-average fiber length of the pulp after the beating is 0.
It is beaten to 75 mm, the added amount of the cationized starch is 1.75 parts by weight, and the dehydration shoe with the pressure adjusting mechanism and the fixed shoe are arranged as dehydration shoes at a paper making speed of 400 m / min. A base paper of Example 20 was manufactured under the same conditions as in Example 1 except that a hybrid former (made by Ishikawajima-Harima Heavy Industries, Ltd .: Deuformer D) was used.

A hybrid former in which 1.75 parts by weight of cationized starch was added, and a dehydration shoe having a pressure adjusting mechanism and a fixed shoe were arranged as dehydration shoes at a papermaking speed of 400 m / min. (Mitsubishi Heavy Industries, Ltd .: MH Former), except that the base paper of Example 21 was manufactured under the same conditions as in Example 1.

A hybrid former in which the amount of cationized starch added was 0.30 parts by weight, and a dehydration shoe with a pressure adjusting mechanism and a fixed shoe were arranged as dehydration shoes at a papermaking speed of 400 m / min so as to face each other. Ishikawajima-Harima Heavy Industries Co., Ltd .: Except that it was manufactured using Deuformer D),
Under the same conditions as in Example 1, a base paper of Comparative Example 5 was produced.

A hybrid former in which the amount of the cationized starch was 3.00 parts by weight, and a dehydration shoe having a pressure adjusting mechanism and a fixed shoe were arranged as dehydration shoes at a papermaking speed of 400 m / min. Ishikawajima-Harima Heavy Industries Co., Ltd .: Except that it was manufactured using Deuformer D),
Under the same conditions as in Example 1, a base paper of Comparative Example 6 was produced.

The weight-average fiber length of the pulp after beating is 0.
It is beaten to 46 mm, the added amount of the cationized starch is 1.75 parts by weight, and the dehydration shoe with the pressure adjusting mechanism as the dehydration shoe and the fixed shoe are arranged so as to face each other at a paper making speed of 400 m / min. A base paper of Comparative Example 7 was manufactured under the same conditions as in Example 1 except that a hybrid former (manufactured by Ishikawajima-Harima Heavy Industries, Ltd .: Deuformer D) was used.

The weight-average fiber length of the pulp after beating is 0.
It is beaten to 80 mm, the added amount of cationized starch is 1.75 parts by weight, and the dehydration shoe with the pressure adjustment mechanism and the fixed shoe are arranged as dehydration shoes at a papermaking speed of 400 m / min. A base paper of Comparative Example 8 was manufactured under the same conditions as in Example 1 except that the hybrid paper was manufactured using a hybrid former (manufactured by Ishikawajima-Harima Heavy Industries, Ltd .: Deuformer D).

<Formation of Backside Resin Layer> Next, after the corona discharge treatment is applied to the paper surface (backside) opposite to the side on which the image forming layer is coated, a low-density polyethylene resin (density = 0.
30 parts by weight of 924 g / cm ³ , MFR = 1 g / 10 min) and a high-density polyethylene resin (density = 0.967 g / c)
(m ³ , MFR = 15 g / 10 min) A compound resin composition consisting of 70 parts by weight was melt-extruded and coated at a resin temperature of 320 ° C. to a resin thickness of 25 μm at a paper traveling speed of 200 m / min. At this time, the cooling roll used was roughened by a liquid honing method, and the following back layer was applied.

For the back layer, the following back layer coating solution was applied by on-machine coating after the back surface resin layer was subjected to corona discharge treatment. As a dry weight, a back layer coating liquid containing colloidal silica: styrene-based latex = 1: 1, and further containing 0.021 g / m ² of sodium polystyrene sulfonate and an appropriate amount of a coating aid was added to the latex (solid). It was applied at a coating amount of 0.21 g / m ² as calculated by weight.

<Formation of Surface Resin Layer> Subsequently, the surface of the base paper was subjected to a corona discharge treatment. .75% by weight) and 50% by weight of anatase type titanium dioxide pigment surface-treated with
A resin composition consisting of 20 parts by weight of a masterbatch of titanium dioxide pigment comprising 2.5% by weight of zinc stearate, 55 parts by weight of a low-density polyethylene resin and 25 parts by weight of a high-density polyethylene resin is 20 μm thick at a resin temperature of 325 ° C. Melt extrusion coating was performed at a running speed of the base paper of 200 m / min. At this time, the surface of the resin layer containing the titanium dioxide pigment of the resin-coated paper was processed into a mirror surface, and the surface quality of the back resin layer was processed into a matte surface such as paper.

Examples 1 to 21 obtained as described above
The surface quality grade and edge stain grade of each sample of the image material support of the present invention and the image material supports of Comparative Examples 1 to 8 other than the present invention were measured by the following test methods.

<Hand feeling> The hand feeling grade is a result of an evaluation of the stiffness (stiffness) of a standard sample performed on an image material support after resin coating when the hand is actually held by hand. The evaluation was given on a five-point scale, with 5 having the best texture and 1 being the poorest surface quality. The support for an image material having an excellent texture needs to be 3 or more, preferably 4 or more.

<Surface Quality Grade> The surface quality grade is the result of visual evaluation of a standard sample performed on a support for an image material after resin coating. 5 with the best surface quality,
The poorest surface quality was evaluated as 1 and evaluated on a 5-point scale.
The support for an image material having excellent surface quality needs to be 3 or more, preferably 4 or more.

<Edge stain grade> The edge stain grade when the image material support of the present invention was used as a photographic material support was measured under the following conditions. That is, the photographic material support is developed with an automatic developing machine (FC Corporation, color roll processor), and the degree of penetration of the processing solution from the edge of the photographic material support after processing is measured by the image after resin coating. Judgment was made based on the results of visual evaluation on a standard sample performed on the material support. The case where the generation of edge stain was most suppressed was rated 5 and the case where the generation of edge stain was most remarkable was 1.
In order to maintain a good appearance, 3 or more, preferably 4
The above is necessary. Table 1 shows the test results obtained by the respective test methods thus obtained.

[0088]

[Table 1] 繊 維 Fiber length Kachi-seki Kachi-seki Former texture Surface quality Ess ゛Addition amount Nitrogen amount Stain (mm) (%) (%) ─────────────────────────────────── Actual 1 0.55 0.50 0.30 Long net 3 3 3 Real 2 0.55 1.00 0.30 Long net 4 4 4 Real 3 0.55 1.75 0.30 Long net 4 4 5 Real 4 0.55 2.50 0.30 Long net 5 4 5 Real 5 0.50 1.75 0.30 Long net 3 3 4 Real 6 0.75 1.75 0.30 Long net 5 3 4 Real 7 0.55 1.75 0.12 Long net 3 3 3 Real 8 0.55 1.75 0.15 Long net 3 3 3 Real 9 0.55 1.75 0.22 Long net 4 4 4 Real 10 0.55 1.75 0.22 Long net 4 4 4 Real 11 0.55 1.75 0.24 Long net 4 4 4 Real 12 0.55 1.75 0.34 Long net 5 4 5 ratio 1 0.55 0.30 0.30 Long net 1 1 1 ratio 2 0.55 3.00 0.30 Long net 5 2 3 ratio 3 0.46 0.50 0.30 Long net 2 2 5 ratio 4 0.80 0.50 0.30 Long net 5 1 3 ━━━━━━━━━━━━━━━━━━━━━ ━━━━━━━━━━━━━ ※ In the table, "real" an embodiment, "ratio" represents the comparative example. * “Fourd line” means a fourdrinier paper machine.

[0089]

[Table 2] 長 Fiber length Kachi-seki Kachi-seki Former texture Surface quality Ess ゛Addition amount Nitrogen amount Stain (mm) (%) (%) ─────────────────────────────────── Actual 13 0.55 1.75 0.22 Long net 3 3 3 Real 14 0.55 1.75 0.30 Long net 4 3 4 Real 15 0.55 1.75 0.34 Long net 4 3 5 Real 16 0.55 1.75 0.30 High frequency 4 4 4 Real 17 0.55 1.75 0.30 High frequency S 4 5 4 Real 18 0.55 1.75 0.34 Hyperit S4 5 4 Actual 19 0.50 1.75 0.30 Hyperitit S3 5 5 Actual 20 0.75 1.75 0.30 Hyperitrit S5 4 4 Actual 21 0.55 1.75 0.30 Hyperit S4 5 4 Ratio 5 0.55 0.30 0.30 Hyperit S1 2 1 Ratio 6 0.55 3.00 0.30 Hyfrit S4 2 3 ratio 7 0.46 0.50 0.30 Hyfrit S2 3 4 ratio 8 0.80 0.50 0.30 High゛ Lit ゛ S 5 2 3 ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ * In the table, “real” is implemented In the examples, "ratio" indicates a comparative example. * “Fourd line” means a fourdrinier paper machine. * "Hybrid II" is a hybrid former with fixed shoes only. * "Hybrid II S" is a hybrid former that uses a fixed shoe and a shoe with a pressure adjustment mechanism.

<Evaluation> In Table 1, by comparing Examples 1-4 and Comparative Examples 1-2, if the added amount of cationized starch was 0.5% by weight or more with respect to pulp, Has good dehydration properties, the cationized starch also works as a strength agent, and the stiffness (feel) of the paper is improved. However, it is understood that if the amount of the cationized starch is too large, the dewatering property in the wire part is deteriorated and the surface quality is deteriorated. From the viewpoints of paper stiffness (texture), surface quality, and penetration, it can be seen that the amount of cationic starch added to pulp is 0.5 to 2.5% by weight. By comparing Examples 3, 5, and 6 with Comparative Examples 3 and 4, the pulp fibers are beaten so that the weight average fiber length is between 0.50 to 0.75 mm, so that the dispersion of the fibers is good. Become
It can be seen that the surface quality is improved. When the weight average fiber length of the pulp fiber is 0.50 mm or less, the dewatering property in the wire part is deteriorated, and the surface quality is rather deteriorated, and at the same time, the stiffness (feel) is not sufficient. When the weight average fiber length is 0.75 mm or more, the fibers cannot be sufficiently dispersed, and the surface quality is deteriorated. Example 3 and Example 7
By comparing Nos. To 12, it can be seen that as the nitrogen content of the cationized starch increases, characteristics such as stiffness (feel), surface quality, and edge stain improve. In particular, it is understood that it is desirable to use a cationized starch having a nitrogen content of 0.2% by weight or more. In Table 2, a comparison is made when manufacturing at a papermaking speed of 400 m / min. When Example 9, Example 3, Example 12 and Examples 13 to 15 in Table 1 were compared with each other, the same composition was used, and when the papermaking speed was increased, the dewatering property in the wire part was relatively reduced. It can be seen that the stiffness (feel) and the surface quality tend to deteriorate. By comparing Example 14 and Example 16, it is understood that the use of the hybrid former that performs double-sided dehydration in the wire part improves the surface quality. By comparing Examples 14 and 15 with Examples 17 and 18, the base material of the image material support of the present invention was manufactured by using a paper machine equipped with a dehydration shoe having a pressure adjusting mechanism.
It can be seen that a support for an image material having satisfactory characteristics in terms of stiffness (texture), surface quality, and edge stain can be provided. In a paper machine equipped with a dehydration shoe with a pressure adjustment mechanism, sufficient dehydration is realized in the wire part, and fibers are re-dispersed at the part sandwiched between the top wire and the bottom wire to form the base paper. To improve. As a result, it is considered that the surface quality of the image material support of the present invention is improved. Example 17 and Comparative Example 5,
6 shows that if the amount of cationized starch added is too small or too large, even if a paper machine equipped with a dehydration shoe having a pressure adjusting mechanism is used, a sufficiently satisfactory surface quality can be obtained. Can not be obtained. That is, by using pulp slurry prepared by adding a pulp slurry to which cationized starch is added in an amount of 0.5 to 2.5% by weight with respect to pulp using a hybrid former equipped with a dehydration shoe having a pressure adjusting mechanism, A support for an image material having good surface quality can be provided. Example 1
By comparing 4, 19 and 20 with Comparative Examples 7 and 8, a pressure adjusting mechanism was provided using a raw material beaten so that the weight average fiber length of the pulp fiber was 0.50 to 0.75 mm. It can be seen that by producing a base paper using a paper machine equipped with a dehydration shoe, it is possible to provide a good support for image materials in terms of stiffness (feel), surface quality, and edge stain. Lastly, in Example 21, if the paper machine was provided with a dehydration shoe having a pressure adjusting mechanism, it was possible to manufacture a base paper having a good formation even if the structure of the wire part was slightly changed. It can be seen that a support for an image material having good surface quality can be provided.

[0091]

The weight average fiber length is 0.50 to 0.75 m
m of pulp, 0.5% cationized starch to 0.5% pulp
２．５2.5% by weight to produce a base paper, and more desirably, papermaking by adding 0.5 to 2.5% by weight of cationized starch having a nitrogen content of 0.20% or more to pulp. By applying the base paper to the support for image materials, the surface quality is excellent,
A support for image materials having a firmness (feel) and a small edge stain can be obtained. Furthermore, by applying a base paper made using a hybrid former or a gap former equipped with a dehydration shoe having a pressure adjusting mechanism to a support for an image material, the surface quality is extremely excellent, and It has been found that contamination of the edge generated after a series of photographic processing steps is remarkably suppressed.

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] October 19, 1999 (1999.10.
19)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0052

[Correction method] Change

[Correction contents]

Next, the base paper is calendered using a machine calendar.
The base paper of Example 1 for a support for image materials having a basis weight of 170 g / m ² and a density of 1.02 g / cm ³ was produced.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H023 FA03 FA13 4L055 AC06 AC08 AG48 CD08 CD09 CE56 EA16 FA15 FA20 GA08 GA15

Claims (3)

[Claims] 1. The weight average fiber length is 0.50 to 0.75 m
m of pulp with cationized starch to 0.5 to 2.
A method for producing a support for an image material, wherein a base paper is formed by adding 5% by weight. 2. The method for producing a support for image materials according to claim 1, wherein the starch is a cationized starch having a nitrogen content of 0.20% or more. 3. The image material support according to claim 1, wherein the base paper is formed using a hybrid former or a gap former provided with a dehydration shoe having a pressure adjusting mechanism. Production method.