JP2003057788A - Support for image element and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a support for an image element having good adhesiveness to a photographic sensitive layer, etc., excellent electrostatic property and a high light transmittance in non-image regions and to provide a method for producing the support. SOLUTION: The support for an image element has an undercoat layer containing a hydrophobic polymer on at least one face of a support material and at least one electrically conductive layer formed by applying and drying a coating liquid of >=pH 8.0 on the undercoat layer. Preferably the logarithm LogSR of the surface resistance in the electrically conductive layer is <=11 [Ω/(square)] and preferably the electrically conductive layer comprises metal oxide particles and a hydrophilic binder and the volume content of the metal oxide particles in the electrically conductive layer is 20-40%. Further preferably the volume resistivity of the metal oxide particles is <=10<7> Ω-cm and the particle diameter of the metal oxide particle is 0.01-1 μm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support for image elements and a method for producing a support for image elements. More specifically, it is suitable for use in photographic light-sensitive materials for medical diagnosis, printing, heat development, etc. The present invention relates to a support for an image element, which has excellent adhesiveness to a photographic photosensitive layer coated on the support and has improved charging characteristics, and a method for producing the support for the image element.

[0002]

2. Description of the Related Art Image elements such as photographic light-sensitive materials are generally
It is produced by coating a photographic light-sensitive layer on a support for an image element having a plastic film as a support material provided with an undercoat layer. The properties required of the support for image elements are, for example, strong adhesion to a photographic photosensitive layer to be applied later, and secondly, the charging property of the support. The support for image elements generally has an electrical insulation property, and during the production process of the photographic light-sensitive material and at the time of use,
There is a problem that electrostatic charges are accumulated by contact friction or peeling between the surfaces of the same kind or different kinds of materials. This accumulated electrostatic charge causes many obstacles, but the most important obstacle is on the support film formed between the support film and the transport roller in the step of coating the photographic emulsion on the support. Static electricity is discharged near the photographic emulsion coating head, and the light generated at that time causes dot-like or dendritic or feather-like spots on the emulsion layer. This is the so-called static mark, which significantly reduces the commercial value of photographic film and, in some cases, completely loses it. For example, medical or industrial X-
It will be easily recognized that it may lead to a very dangerous judgment when it appears in a ray film or the like. This phenomenon becomes apparent only after developing, and is one of the very troublesome problems. Further, these accumulated electrostatic charges also cause a secondary failure such as adhesion of dust to the film surface or non-uniform coating.

First, various methods have hitherto been attempted as a method for firmly adhering a photographic photosensitive layer onto a support for image elements. As the method, a method of directly applying a photographic layer after performing an electron impact treatment such as an electric discharge treatment or an ultraviolet ray treatment, or a method of performing an electron impact treatment once and then applying an undercoat layer and then applying a photographic layer thereon Method of applying a layer: After performing an electron impact treatment once, an undercoat first layer is applied, and then a subbing second layer made of a hydrophilic polymer is applied, and a photographic layer is applied thereon. There are ways to do it, etc. Regarding these methods, for example, U.S. Pat. Nos. 2,698,241, 2,764,520, 2,864,555, and 286 are known.
No. 4756, No. 3475193, and British Patent No. 788.
No. 365, No. 804005, No. 8991469.

Among these methods, the above-mentioned method is generally widely used. In particular, when the support material is polyethylene terephthalate (hereinafter sometimes referred to as “PET”), polystyrene or the like, after the surface activation treatment, the undercoat first layer and the undercoat second layer are further formed. If not provided, there is a problem that the adhesion between the support and the photographic photosensitive layer is weak. However, even in the above method, the adhesion is not sufficient. Therefore, for example, as described in US Pat. No. 3,788,856, a method of mixing latex with the undercoating second layer has been attempted. However, in this method, when the support provided with the undercoating second layer is wound in the support manufacturing step, the undercoating second layers on the front surface or the one surface on the opposite surface to the undercoating second layer And become very easy to bond,
It becomes difficult to unwind and send the support roll,
In fact, there is a problem of lack of manufacturing suitability in the photographic industry.

Secondly, the best way to eliminate the electrostatic damage is to dissipate the electrostatic charge in a short time before increasing the electrical conductivity of the substance and discharging the accumulated charge. is there. Various efforts have been made in the past to provide such a conductive layer to a support. For example, as described in US Pat. No. 3,864,132, there is a method of providing a vapor deposition layer of metal oxide. However, when the method is applied to the photographic industry, there is a problem that the equipment investment of vapor deposition equipment is required and the vapor deposition processing speed is slower than the coating processing speed generally used in the photographic industry, resulting in low productivity.

As a method of solving this problem, there is a method of using a conductive water-dispersible polymer and a crosslinkable latex, as described in, for example, JP-A-55-145783. However, in this method, since a hydrophilic latex is used, when this layer is used as the undercoat layer, as in the case where the polymer latex is mixed with the undercoat layer, the undercoat layers or the undercoat layer are mixed. And the opposite surface of the support may cause unnecessary adhesion, which may prevent the pre-rolled roll from unwinding. Further, when the conductive latex is a cation latex, there is a problem that when it is used for the undercoat layer, it has an adverse effect on the photographic characteristics peculiar to the cation substance.

On the other hand, for example, US Pat.
Specification, Japanese Patent Laid-Open Nos. 52-113224 and 55-1
No. 2927, etc., use of crystalline metal oxides such as zinc oxide, stannic oxide, and indium oxide as a conductive material for a conductive support of an electrophotographic photoreceptor or an electrostatic recording body. Is listed. However, the use of these crystalline metal oxide particles as an antistatic agent for silver halide emulsions has not been known at all, and these conductive materials have no interaction with the silver halide photosensitive emulsion layer. It was totally unpredictable to have. By the way, silver halide and copper halide are used as the conductive material described in US Pat. No. 3,245,833, and these conductive materials are halogenated as shown in US Pat. No. 3,428,451. It has been clarified that it has an interaction with the silver halide emulsion layer and adversely affects photographic properties.

Further, an image obtained by using a photographic light-sensitive material may be observed with transmitted light or may be observed with reflected light. In the latter case, it is preferable that the reflectance of the non-image portion is as high as possible. on the other hand,
In the former case, it is preferable to increase the light transmittance of a portion without an image, and to reduce the light scattering by the photographic light-sensitive material. For the purpose of reducing light scattering as much as possible, there is a large limitation in introducing a conductive layer into a photographic light-sensitive material to prevent static electricity, and in reality, it is disadvantageous in the manufacturing process. However, it has been unavoidable to use a conductive water-dispersible polymer or the like having unnecessary adhesive properties.
Therefore, the above-mentioned U.S. Pat. No. 3,062,700, JP-A-52-113224 and JP-A-55-12927.
Although the zinc oxide, the conductive stannic oxide and the indium oxide described in each of the publications can be used for the electroconductive or electrostatic recording electroconductive paper in this sense, the images can be observed by the transmitted light. The silver halide photographic light-sensitive material of this type has a problem that it cannot be used as it is.

In view of the above problems, Japanese Patent Publication No. 1-20735
In the publication, a support material is provided with an undercoating first layer containing a hydrophobic polymer as a main component, and a volume resistivity of 10
A support provided with an undercoating second layer (conductive layer) containing specific metal oxide fine particles having a resistivity of ⁷ Ω-cm or less and a hydrophilic binder is described. In the support, an undercoating second layer (conductive layer) containing specific metal oxide fine particles and containing a hydrophilic binder is provided to improve the adhesiveness and the charging property. There is. However, even if the content of the metal oxide fine particles is small, a support for an image element is desired which has more excellent charging characteristics and is excellent in adhesiveness with a photographic photosensitive layer and in light transmission. Is the current situation.

[0010]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems in the prior art and achieve the following objects. That is, the present invention is, firstly, a support for an image element provided with a conductive layer having good adhesion to a photographic photosensitive layer or the like to be subsequently applied, and having sufficient strength,
And to provide a method for producing the support for the image element. Secondly, the present invention shows excellent charging characteristics even when a small amount of metal oxide particles is contained, and does not generate static marks or dust on the film surface in the step of forming a photographic photosensitive layer. First, it is an object of the present invention to provide a support for image elements capable of uniformly coating a photographic photosensitive layer, and a method for producing the support for image elements. The present invention is
Third, the light scattering is small, the light transmittance of the non-image area is high,
An object of the present invention is to provide an image element support suitable for a photographic light-sensitive material for observing an image with transmitted light, and a method for producing the image element support.

[0011]

Means for solving the problems Means for solving the above problems are as follows. That is, <1> an undercoat layer containing a hydrophobic polymer on at least one surface of the support material, and a pH of 8. on the undercoat layer.
A support for an image element, comprising at least one conductive layer formed by applying and drying a coating solution of 0 or more.

<2> Surface resistance S of the conductive layer
The image element support according to <1>, wherein the logarithmic value LogSR of R is 11 [Ω / □] or less.

<3> The conductive layer contains metal oxide particles and a hydrophilic binder, and the volume content of the metal oxide particles in the conductive layer is 20% or more and 40% or less. The support for image elements according to <1> or <2>.

<4> The metal oxide particles are ZnO,
TiO₂, SnO₂, Al₂O₃, In ₂O₃, MgO, Ba
O, MoO₃Crystalline metal oxides selected from the group consisting of
Compounds, their complex oxides, and small amounts of heteroatoms
At least one of the metal oxides contained
The support for image elements according to <3> above.

<5> The volume resistivity of the metal oxide particles is 10 ⁷ Ω-cm or less, and the particle diameter of the metal oxide particles is 0.01 μm to 1 μm. The support for image elements described in <>.

<6> The support for image elements according to any one of <1> to <5>, wherein the support material is a film containing at least one of polyethylene terephthalate and polyethylene naphthalate. .

<7> On at least one side of the support material,
It has a first step of forming an undercoat layer containing a hydrophobic polymer, and a second step of applying a conductive layer coating solution on the undercoat layer and drying it to form at least one conductive layer. Then, the pH of the conductive coating solution in the second step is
It is a method for producing a support for image elements, which is 8.0 or more.

<8> Surface resistance S of the conductive layer
The method for producing a support for image elements according to <7>, wherein a logarithmic value LogSR of R is 11 [Ω / □] or less.

<9> The conductive layer contains metal oxide particles and a hydrophilic binder, and the volume content of the metal oxide particles in the conductive layer is 20% or more and 40% or less. The method for producing a support for image elements according to <7> or <8>.

<10> The metal oxide particles are Zn
O, TiO ₂ , SnO ₂ , Al ₂ O ₃ , In ₂ O ₃ , MgO,
The crystalline metal oxide selected from the group consisting of BaO and MoO ₃ , a composite oxide thereof, and a metal oxide containing a small amount of a heterogeneous atom in the above <9> containing at least one kind. It is a method for producing the support for image elements described.

<11> The volume resistivity of the metal oxide particles is 10 ⁷ Ω-cm or less, and the particle size of the metal oxide particles is 0.01 μm to 1 μm.
Alternatively, the method for producing the support for image elements according to <10>.

<12> The above-mentioned <7>, wherein the support material is a film containing at least one of polyethylene terephthalate and polyethylene naphthalate.
<11> to <11>.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION The image element support of the present invention and the method for producing the image element support are described below. (Support for Image Element and Method for Producing the Same) The support for image element of the present invention comprises an undercoat layer containing a hydrophobic polymer on at least one surface of a support material, and a pH on the undercoat layer.
Of 8.0 or more, and at least one conductive layer formed by applying and drying the coating solution.

<Conductive Layer> Here, the conductive layer in the image element support is described. The conductive layer in the present invention is characterized in that it is formed by applying a coating solution having a pH of 8.0 or more to the undercoat layer coated on at least one surface of the support material and drying it. .
The conductive layer preferably contains metal oxide particles from the viewpoint that electrostatic conductivity is not accumulated on the support by giving conductivity, and the metal oxide particles are dispersed in a coating liquid. From the viewpoint of being present in a stabilized state, it is preferable to contain a hydrophilic binder. Also,
The volume content of the metal oxide particles in the conductive layer is preferably 20% or more and 40% or less.

-Metal Oxide Particles- The metal oxide particles contained in the conductive layer are Z
nO, TiO ₂ , SnO ₂ , Al ₂ O ₃ , In ₂ O ₃ , Mg
A crystalline metal oxide selected from the group consisting of O, BaO, and MoO ₃ , a composite oxide thereof, and a metal oxide containing a small amount of a heteroatom therein are preferable to contain at least one kind. . That is, it is preferable that the conductive metal oxide particles used in the present invention contain a crystalline metal oxide, and those containing an oxygen defect and a different kind of metal oxide that forms a donor with respect to the metal oxide used. Those containing a small amount of atoms are more preferable because they generally have high conductivity, and those containing a small amount of different atoms are particularly preferable from the viewpoint of not causing fog in the silver halide emulsion.

Metal Oxidation Contained in the Metal Oxide Particles
Examples of the material include ZnO and TiO₂, SnO₂, Al
₂O₃, In₂O₃, MgO, BaO, MoO₃Crystallinity of etc.
Metal oxides or composite oxides thereof are preferable,
Among them, ZnO and TiO ₂And SnO₂Is more preferred
Yes. In addition, a metal oxide containing a small amount of the heteroatom
For example, ZnO may contain Al, In, etc.
Of TiO₂For Nb, Ta, etc.,
SnO₂To Sb, Nb, halogen elements, etc.
Preferred are those listed below. As the addition amount of the heteroatom
For example, the range of 0.01 to 30 mol% is preferable, and
The range of 1-10 mol% is more preferable.

The particle size of the metal oxide particles used in the conductive layer is preferably small in order to minimize light scattering, but should be determined by using the ratio of the refractive index of the particles and the binder as a parameter. Is. Although detailed examinations have been made in Japanese Patent Publication No. 1-20735, etc., in a light-sensitive material of the type in which an image is directly observed with the naked eye, the scattering efficiency of the highlight portion of the image is preferably 50% or less, The scattering efficiency is preferably 20% or less in a light-sensitive material of a type in which an image is projected and used such as a slide or a negative film.

In order to realize the above scattering efficiency, the particle size of the metal oxide particles contained in the conductive layer is 0.0
1 μm to 1 μm is preferable, 0.05 μm to 0.5 μm
Is more preferable, and 0.05 μm to 0.2 μm is particularly preferable. By using conductive particles having a particle size of 0.05 μm to 0.2 μm, a light-sensitive material having a light scattering efficiency of 10% or less and an extremely high light transmittance can be obtained. On the other hand, when the particle size is larger than 1 μm, the particles do not fit in the conductive layer and light scattering becomes large.

As one means for evaluating the charging characteristic of the support, the surface resistance value (hereinafter abbreviated as "SR [Ω / □]").
The surface resistance value required for the image element support is 25 ° C. and 25% R.V. H. Even in such a low humidity environment, if the value is expressed in logarithm, LogS
R = 11 [LogΩ / □] or less is preferable, and LogSR = 1
It is more preferably 0 [LogΩ / □] or less. When the SR value of the support for image elements is larger than LogSR = 11 [LogΩ / □], static marks are generated during the coating of the photosensitive layer, and the commercial value is significantly impaired. In the case of printing sensitive materials,
When a customer collects a plate after photographing and developing, static electricity causes dust and troubles, which is a serious problem.

Therefore, assuming a coating thickness of about 0.1 to 1 μm, which is used as an ordinary conductive layer, the volume resistivity of the metal oxide particles is 10 ⁷ Ω-cm.
The following is preferable, and 10 ⁵ Ω-cm or less is more preferable.

The metal oxide particles used in the conductive layer of the image element support of the present invention are mainly produced by the following method. First, a method in which metal oxide particles are produced by firing, and heat treatment is performed in the presence of a heteroatom that improves conductivity. Second, in order to improve conductivity when producing metal oxide particles by firing. And a method of introducing oxygen vacancies by lowering the oxygen concentration in the atmosphere when producing the metal oxide particles by firing, and the like.

In the first method, the conductivity of the surface of the fine particles can be effectively improved, but grain growth may occur during the heat treatment, so it is necessary to select the conditions. Also,
It may be better to perform the heat treatment in a reducing atmosphere. The second method is preferable from the viewpoint of the lowest manufacturing cost. For example, in the method of obtaining SnO ₂ fine particles by spraying β-stannic acid colloid (amorphous) which is a hydrate of SnO _{2 in} the firing furnace, antimony chloride, antimony nitrate, antimony oxide are contained in the β-stannic acid colloid. If the hydrate or the like is coexistent, conductive SnO ₂ fine particles can be obtained. Further, as another example, in a so-called vapor phase method of producing SnO ₂ and TiO ₂ by oxidatively decomposing SnCl ₄ and TiCl ₄ , when SnO ₂ and TiO ₂ which are salts of different atoms are coexistent at the time of oxidative decomposition, conductive SnO ₂ and TiO _{2 are obtained.} Can be obtained. Further, in a method of thermally decomposing an organic acid salt of a metal to obtain a metal oxide, there is also a method of causing salts of different metals to coexist during the thermal decomposition.

As an example of the third method, in a vacuum evaporation method in which a metal is evaporated in an oxygen atmosphere to obtain metal oxide particles, a method of keeping the amount of oxygen insufficient, or a method of not supplying oxygen sufficiently There is a method of heating metals and metal salts.

As the metal oxide particles used in the present invention, those whose surface is subjected to a coupling treatment can be used from the viewpoint of preventing coating unevenness during high speed coating of the photosensitive layer. Regarding the coupling treatment of the metal oxide particles,
The details are described in JP-A-5-281659.

Further, the metal oxide particles used in the present invention are preferably small as described above, but the fine particles obtained by the above-mentioned particle production method are strongly aggregated into large particles. There is. In order to avoid this, it is often effective to make fine particles, which do not directly contribute to the improvement of conductivity, coexist as a fine-particle-forming aid when producing conductive particles. The particles used for this purpose include fine metal oxide particles (for example, ZnO, TiO ₂ , Al ₂ O ₃ , SiO ₂ , Mg) which are not produced for the purpose of enhancing conductivity.
O, BaO, WO ₃ , MoO ₃ , P ₂ O ₅ etc.) BaSO ₄ ,
There are fine particles of sulfate such as SrSO ₄ , CaSO ₄ and MgSO ₄ , fine particles of carbonate such as MgCO ₃ and CaCO ₃ .

Since the above-mentioned fine-particle-forming aid has little coloring, it can be used together with the above-mentioned metal oxide particles in a binder. In addition, physical or chemical treatment can be performed for the purpose of removing most of the particles for auxiliary agent and coarse particles. That is, the obtained particles are put into a liquid and pulverized by a ball mill, a sand mill or the like, and then a method of selectively collecting ultrafine metal oxide particles by filtration, elutriation or centrifugal sedimentation, or after the pulverization The method of dissolving only the auxiliary particles is effective. By repeating and combining these operations, ultrafine metal oxide particles can be effectively obtained. If a surfactant as a dispersion aid, a small amount of binders usable in the present invention or a small amount of Lewis acid or Lewis base is added to the liquid in which the particles are dispersed, ultrafine conductive particles can be obtained more effectively. . It is self-evident that the particles that can be used as the auxiliary particles can be used in a wider range by using the chemical treatment together.

-Hydrophilic Binder- Here, the hydrophilic binder contained in the conductive layer will be described. In the support for image elements of the present invention, the hydrophilic binder contained in the conductive layer includes proteins such as gelatin, derivative gelatin, colloidal albumin and casein; carboxymethyl cellulose, hydroxyethyl cellulose, diacetyl cellulose, triacetyl cellulose. Cellulose compounds such as agar; sugar derivatives such as agar, sodium alginate, and starch derivatives;
Synthetic hydrophilic colloid such as polyvinyl alcohol, poly-N-vinylpyrrolidone, polyacrylic acid copolymer,
Polyacrylamide or derivatives thereof, partial hydrolysates, vinyl polymers such as polyvinyl acetate and polyacrylic acid esters and copolymers thereof, natural products such as rosin and shellac and derivatives thereof, and many other synthetic resins Suitable examples include: In addition, water emulsions such as styrene-butadiene copolymer, polyacrylic acid, polyacrylic acid ester and its derivatives, polyvinyl acetate, vinyl acetate-acrylic acid ester copolymer, polyolefin, olefin-vinyl acetate copolymer are also used. can do. Of these, gelatin is the most preferable. It is also possible to use a hydrate colloid of a metal oxide such as aluminum oxide, tin oxide or vanadium oxide as a binder.

In the present invention, as the hydrophilic binder contained in the conductive layer, a conventionally known conductive polymer can be used as a part or all of the hydrophilic binder. Examples of the conductive polymer include polyvinyl benzene sulfonates, polyvinyl benzyl trimethyl ammonium chloride, U.S. Patent Nos. 4,108,802, 4,118,231, 4,126467, and 4,137. , 217, quaternary salt polymers described in US Pat.
0,189, OLS 2,830,767 (US S
erNo. Suitable examples thereof include cross-linked polymer latexes described in each specification of 816127).

A cross-linking agent can be added to the hydrophilic binder in the conductive layer. As a cross-linking agent,
The organic or inorganic crosslinking agent can be added alone or in combination of two or more. Examples of the cross-linking agent include C.I. E. K. Mees and T.M. H. Ja
mes “The Theory of the Ph”
otographic Process "3rd edition (19
66) U.S. Pat. Nos. 3,316,095, 323,276
No. 4, No. 3288775, No. 2732303, No. 3
No. 635718, No. 3232763, No. 273231
No. 6, No. 2586168, No. 3103437, No. 3
No. 017280, No. 29886 Mountain, No. 2725294
No. 2725295, 3100704 and 30
91587, 3332313, and 3543292.
No. 3,125,449, British Patent Nos. 994869, 1167207, etc. are suitable. Further, a preferable specific example is Japanese Patent Publication No. 1-2.
There is detailed description in Japanese Patent No. 0736.

-Protective Layer-The support for image elements of the present invention has an undercoat layer formed on at least one surface of a support material, and further has metal oxide particles having conductivity and a hydrophilic binder on the undercoat layer. However, in order to reduce light scattering by the conductive layer, the following points should be noted. That is, light scattering can occur not only inside the conductive layer but also at the interface where the conductive layer contacts another substance. In the support for image element of the present invention, a mode in which a photosensitive layer is formed on the surface on which the undercoat layer and the conductive layer are formed, and on the surface opposite to the side on which the undercoat layer and the conductive layer are formed. There is a mode in which an undercoat layer is formed and a photosensitive layer is provided thereon. In the case of the former, since the binder for the conductive layer and the binder for the photosensitive layer have almost the same refractive index,
The influence of light scattering at the interface between both layers is not so large. On the other hand, in the latter case, when the conductive layer is arranged at the back surface of the photosensitive material, that is, at the position where the photographic photosensitive material and the external medium (usually air) are in contact, light scattering occurs at the interface between the undercoat layer and the medium. Occurs. In order to suppress this light scattering, there is a method of providing a coating layer so as to cover the conductive layer. This coating layer can also serve as a protective layer for the conductive layer, and is one of the preferred embodiments of the present invention.

-Formation of Coating Solution for Conductive Layer and Conductive Layer- In the method for producing a support for image elements of the present invention, an undercoat layer containing a hydrophobic polymer is formed on at least one surface of the support material. For the conductive layer in the second step, the method has a first step and a second step of applying a coating liquid for a conductive layer on the undercoat layer and drying it to form at least one conductive layer. The coating liquid has a pH of 8.0 or more.

In the support for image elements of the present invention, the conductive layer may be formed by coating and drying any coating solution for the conductive layer, which is aqueous system or organic solvent system. From the viewpoint of the above, it is preferable to use an aqueous coating solution. Here, the "water-based coating liquid" means a coating liquid in which 30% by mass or more, and more preferably 50% by mass or more of the solvent (dispersion medium) of the coating liquid is water.

Specific solvent compositions include, for example, the following mixed solutions in addition to water. Water / methanol = 8
5/15, water / methanol = 70/30, water / methanol / dimethylformamide (DMF) = 80/15 /
5, water / isopropyl alcohol = 60/40 and the like (however, the numbers here represent the mass ratio).

In the present invention, the metal oxide particles, the hydrophilic binder, and, if necessary, the cross-linking agent and other components described below are dissolved or dispersed in the solvent to form a conductive layer coating solution having a pH of A pH of 8.
It is adjusted to be 0 or more. As the pH adjuster, for example, NaOH, HCl or the like is preferably used.

Conductive coating solution (p
H6 to 7) is used, the charging characteristics required for the support for image elements (specifically, preferable surface resistance SR)
In order to sufficiently impart [Ω / □]), the volume content of the metal oxide particles in the conductive layer needs to be 50% or more, while the volume content of the metal oxide particles is If is too high, there is a problem that the strength of the conductive layer becomes weak. Therefore, in the present invention, by adjusting the pH of the conductive layer coating liquid to be 8.0 or more, even when the volume content of the metal oxide particles is low, it has preferable charging characteristics and the strength of the conductive layer. Also, it becomes possible to manufacture a sufficient support. From the above viewpoint, in the present invention, the volume content of the metal oxide particles in the conductive layer is preferably 20% or more and 40% or less, and more preferably 25% or more and 35% or less.

In the present invention, the coating solution for the conductive layer is a known coating method such as a dip coating method, an air knife coating method, a curtain coating method, a roller coating method, a wire bar code method, a gravure coating method, or It can be applied by an extrusion coating method using a hopper described in US Pat. No. 2,681,294. Also, if necessary, US Pat.
61791, 3508947, and 2941898.
Two or more layers can be simultaneously coated by the method described in No. t and No. 3526528, "Coating Engineering", page 253 (published by Asakura Shoten, 1973) by Ozaki et al.

In the present invention, the wet coating amount of the coating liquid for the conductive layer is 1 to 20 per 1 m ² of the support.
ml is preferable, and 3 to 10 ml is more preferable. Also,
The thickness of the conductive layer is preferably 0.05 μm to 3 μm, more preferably 0.1 μm to 1 μm.

The electroconductive layer coating solution applied by the above-mentioned method is subsequently dried in a drying step under the conditions of 120 ° C. to 200 ° C. for 10 seconds to 1 second.
0 minutes is preferable, and the temperature and time can be appropriately determined within this range.

-Other Components-In the support for image elements of the present invention, in the conductive layer, in addition to the metal oxide particles and the hydrophilic binder, if necessary, a swelling agent, a matting agent, and a charging agent. Inhibitors, surfactants and the like may be added. As the swelling agent, for example, phenol, resorcin or the like may be added, and the addition amount is preferably 1 to 10 g per 1 L of the conductive layer coating liquid. As the matting agent, from the viewpoint of improving high-speed transportability in the production of a support. Particle size 0.1 μm-10
μm silicon dioxide (silica), polystyrene, polymethylmethacrylate are preferred. As the antistatic agent, an anionic surfactant, a cationic surfactant, an ionene-based polymer, a maleic acid-based copolymer described in JP-A-49-3972 or the like can be used.

<Undercoat Layer> Next, the undercoat layer formed on at least one surface of the support material in the support for image elements of the present invention will be described.

-Hydrophobic Polymer-The support for image elements of the present invention comprises a support material and a conductive layer in order to increase the adhesive strength between the conductive layer containing the metal oxide particles and the support material. An undercoat layer is provided between and. The undercoat layer contains a hydrophobic polymer as a main component. The polymer (mainly a hydrophobic polymer) contained in the undercoat layer has a function as a binder and can be selected from any polymer or copolymer having a strong adhesive strength to the support material. it can. This strong bond strength must be maintained in the dry state before and after processing with conventional photographic processing solutions, and also in the wet state during processing with conventional photographic processing solutions.

The polymer or copolymer preferable as the binder for the undercoat layer is, for example, a copolymer of styrene; a carboxylated copolymer of butadiene and acrylonitrile, or a copolymer of styrene, butadiene and acrylate. Butadiene copolymers such as copolymers of styrene, butadiene, acrylic ester and divinylbenzene; copolymers of vinyl esters such as copolymers of vinyl chloroacetate, ethyl acrylate and acrylamide; polyesters and copolymers Polyesters and copolyesters such as aqueous dispersions of polyesters, eg copolymers of sulphoterephthalic acid, terephthalic acid, isophthalic acid, ethylene glycol and neopentyl glycol (particularly those marketed as "Eastman Binder"DFB); linear Polyester urethane (especially Polyurethanes such as Deamacol "8066 as commercially available), acrylic acid esters and / or copolymers containing methacrylic acid ester, for example,
Copolymers also containing 1 to 15 mol% of hydrophilic copolymers such as itaconic acid, acrylamide or methacrylamide:
Vinyl chloride copolymers, for example vinyl chloride copolymers including acrylic and / or methacrylic acid esters and hydrophilic copolymers such as icotanic acid, acrylamide or methacrylamide; and vinylidene chloride copolymers, for example: Suitable examples include vinylidene chloride, acrylonitrile, itaconic acid copolymer or vinyldene chloride, methyl acrylate, acrylic acid copolymer,
The present invention is not limited to these specific examples.

As a group of copolymers which are preferably used in the undercoat layer, for example, JP-A-55-65949, JP-A-51-112326, JP-A-51-117617 and JP-A-51-167517 can be used.
1-121323, 51-123139, 51
JP-A-52-65422, an aqueous dispersion of a copolymer comprising a diolefin monomer, at least one vinyl monomer, and optionally other components described in JP-A-139320.
No. 51-114120, the blend may be described.

Another group of preferred copolymers suitable for use in the subbing layer is vinylidene chloride copolymers such as the photographic subbing layers described in US Pat. No. 2,627,088. There are those known in the art.
Suitable copolymers to be copolymerized with vinylidene chloride, for example, acrylonitrile, methacrylonitrile,
Acrylamide, methacrylamide, N-methylol acrylamide, citraconic acid, maleic acid, fumaric acid,
Crotonic acid, mesaconic acid, itaconic acid, monoalkyl ester of itaconic acid whose alkyl group has 1 to 4 carbon atoms, itaconic anhydride, maleic anhydride, acrylic acid, methacrylic acid, alkyl group having 1 carbon atom Alkyl esters of acrylic acid and methacrylic acid which are ~ 18 vinyl acetate, vinyl chloride, styrene, vinyl vinyl acetate,
Preferable examples include allyl halogenoacetate and the like.

—Formation of Undercoat Layer— It may be contained in addition to the solvent used in the coating solution for the undercoat layer, the coating method, the coating amount, the layer thickness, and the binder (main component; hydrophobic polymer). Other components and the like are the same as those of the conductive layer.

<Support Material> The support material used in the support for image elements of the present invention will be described below. What is used as the support material,
For example, cellulose nitrate film, cellulose acetate film, cellulose acetate butyrate film, cellulose acetate propionate film, polystyrene film, polyethylene naphthalate (PEN) film, polyethylene terephthalate (P
ET) film represented by linear polyester (terephthalic acid, isophthalic acid, phthalic acid, 2,5-2,6- and 2,7-naphthalenedicarboxylic acid, succinic acid, sebacic acid, adipic acid, azelaic acid, diphenyl Dicarboxylic acids, hexahydroterephthalic acid, dicarboxylic acids such as bis-p-carboxyphenoxyethane, or one or more lower alkyl diesters, optionally in combination with a monocarboxylic acid such as piparinic acid, It can be obtained by condensing with more glycol such as ethylene glycol, 1,3-propanediol, 1,4-heptanediol, neopentyl glycol, or 1,4-cyclohexanedimethanol.), Polycarbonate film, etc. Suitable laminates are It is.

Further, papers coated with or laminated with a baryta or α-olefin polymer, in particular, a polymer of α-olefin having 2 to 10 carbon atoms such as polyethylene, polypropylene and ethylene-butene copolymer are also preferred.

Among the above preferable support materials, polyethylene terephthalate (PET) film and polyethylene naphthalate (PEN) film are more preferable.
These support materials are used by selecting from transparent materials and opaque materials according to the purpose of use of the photographic light-sensitive material. Further, in the case of being transparent, not only colorless and transparent but also dyes and pigments can be added to make transparent.

If necessary, the support material may be preliminarily subjected to a preliminary treatment such as a corona discharge treatment, an ultraviolet irradiation treatment, a flame treatment, a vacuum glow discharge treatment, etc., before forming the undercoat layer by coating. .

(Photosensitive material) In the photographic photosensitive material using the support for image elements of the present invention, each photographic constituent layer (photosensitive layer or non-photosensitive layer) provided on the support is as follows. A binder may be included. Examples of hydrophilic colloids include proteins such as gelatin, colloidal albumin and casein; cellulose compounds such as carboxymethyl cellulose and hydroxyethyl cellulose; sugar derivatives such as agar, sodium alginate and starch derivatives; synthetic hydrophilic colloids such as polyvinyl alcohol and poly-N. -Vinylpyrrolidone, polyacrylic acid copolymers, polyacrylamides or their derivatives and partial hydrolysates, and the like. If desired, a mixture of two or more of these colloids is used.

Among the above-mentioned preferred binders, gelatin is most used, but gelatin here means so-called lime-processed gelatin, acid-processed gelatin and enzyme-processed gelatin. Part or all of gelatin can be replaced with synthetic polymer substances, and so-called gelatin derivatives, that is, amino groups, imino groups, hydroxy groups or carboxy groups as functional groups contained in the molecule can react with them. Treated with a reagent that has one group,
It may be modified or may be replaced with a graft polymer in which the molecular chains of a polymer substance are bonded.

In the photographic light-sensitive material using the support for image elements of the present invention, the silver halide photographic emulsion forming the light-sensitive layer is usually a water-soluble silver salt (eg silver nitrate) solution and a water-soluble halogen salt (eg Potassium bromide) solution in the presence of a water-soluble polymer solution such as gelatin. As the silver halide, in addition to silver chloride and silver bromide, mixed silver halides such as silver chlorobromide, silver iodobromide and silver chloroiodobromide can be used. These silver halide grains are manufactured according to known and conventional methods. Of course, it is also useful to manufacture using a so-called single jet method, double jet method, control double jet method, or the like.

The above-mentioned silver halide photographic emulsions are described in T.W. H. J
Ames and C.I. E. K. Mees, "The T
history of the Photographic
Process "3rd edition, published by Mac Millan; P. Grafikides, “Chemie P
"photographique", Paul Mont
It can be prepared by various methods such as the ammonia method, the neutral method and the acidic method, which are also described in publications such as published by EL Inc. and are generally used.

The silver halide grains thus prepared are treated with a chemical sensitizer (eg sodium thiosulfate, N, N,
N'-trimethyl thiourea, monovalent gold thiocyanate complex salt, monovalent gold thiosulfate complex salt, stannous chloride, hexamethylenetetramine, etc.) to increase the sensitivity without coarsening the particles. Can be made.

The silver halide photographic emulsion may be spectrally sensitized or supersensitized by using polymethine sensitizing dyes such as cyanine and carboxylic amine, alone or in combination, or in combination with a styryl dye, if necessary. Sensitization can be performed.

Further, various compounds can be added to the silver halide photographic emulsion in order to prevent the deterioration of sensitivity and the occurrence of fog during the manufacturing process, storage or processing of the light-sensitive material. Examples of the compound that can be added include 4-hydroxy-6-methyl-1,3,3a, 7-tetrazaindene-3-methyl-benzothiazole and 1-phenyl-5.
-Many heterocyclic compounds including mercaptotetrazole, mercury-containing compounds, mercapto compounds, and extremely many compounds such as metal salts have been known for a long time. Examples of compounds that can be used are described in T.W. H. James and C.I. E. K.
Mees, "The Theory of the"
"Photographic Process", 3rd edition (1966), published by Mac Millan, Inc., with reference to the original documents.

When the above silver halide photographic emulsion is used as a color photographic light-sensitive material, a coupler may be contained in the silver halide emulsion layer. As the couplers preferably used, 4-equivalent diketomethylene yellow couplers, 2-equivalent diketomethylene yellow couplers, for example, U.S. Pat. Nos. 3,277,157, 3,408,194 and 3,551, No. 155, JP-A Nos. 47-26133 and 48-66836.
Compounds described in Japanese Patent Publication No. 4 or the like; 4-equivalent or 2-equivalent pyrazolone magenta couplers and indazolone magenta couplers, for example, US Pat. No. 2,600,788.
Nos. 3,214,437 and 3,476,560, and compounds described in JP-A-47-26133; α-naphthol cyan couplers and phenol cyan couplers, for example, U.S. Pat. No. 2,47
No. 4,293, No. 3,311,476, No. 3,48
The compounds and the like described in the respective specifications of No. 1,741 are preferably used. In addition, U.S. Pat. No. 3,227,55
No. 4, No. 3,253,924, No. 3,379,529
Nos. 3,617,291 and 3,770,436, which can release the development inhibitor, can be used.

The silver halide emulsion layer (photosensitive layer) and the other hydrophilic colloid layer (non-photosensitive layer) in the photographic light-sensitive material of the present invention are treated with various organic or inorganic hardeners (alone or in combination). Can be cured. Typical examples of the curing agent include mucochloric acid, formaldehyde, trimethylolmelamine, glyoxal, and 2,3.
-Aldehyde compounds such as dihydroxy-1,4-dioxane, 2,3-dihydroxy-5-methyl-1,4-dioxane, succinaldehyde and glutaraldehyde; divinyl sulfone, methylene bismaleimide,
1,3,5-triacryloyl, hexahydro-s-triazine, 1,3,5-trivinylsulfonyl-hexahydro-s-triazine bis (vinylsulfonylmethyl) -ether, 1,3-bis (vinylsulfonyl) propanol- 2, active vinyl compounds such as bis (α-vinylsulfonylacetamido) ethane; 2,4-dichloro-6-hydroxy-s-triazine sodium salt, 2,4-dichloro-6-methoxy-s-triazine Such active halogen compounds; ethyleneimine compounds such as 2,4,6-triethyleneimino-s-triazine;

Surfactants may be added to the photographic constituent layers (photosensitive layer, non-photosensitive layer, etc.) alone or as a mixture. Although they are used as coating aids,
It is sometimes applied for other purposes such as emulsion dispersion, improvement of sensitization and other photographic characteristics, and adjustment of charge train.
Examples of the surfactant include natural surfactants such as saponin, nonionic surfactants such as alkylene oxide, glycerin, and glycidol, higher alkylamines, quaternary ammonium salts, pyridine and other heterocycles, phosphonium. Or a cationic surfactant such as sulfonium; anionic surfactant containing an acidic group such as carboxylic acid, sulfonic acid, phosphoric acid, sulfuric acid ester, phosphoric acid ester, amino acid, aminosulfonic acid, sulfuric acid or phosphoric acid of aminoalcohol Suitable examples include amphoteric surfactants such as esters. It is also possible to use a fluorochemical surfactant for the same purpose.

Some examples of the surfactant compounds that can be used are described in US Pat. Nos. 2,271,623 and 2,240,
No. 472, No. 2,288,226, No. 2,739,8
No. 91, No. 3,068, 101, No. 3, 158, 48
No. 4, No. 3,201,253, No. 3,210,191
Issue No. 3,294,540 Issue No. 3,415,649
Nos. 3,441,413, 34,422,654
No. 3,475,174, No. 3,545,974
Issue No. 3,666,478 Issue 3,507,660
No. 1, British Patent No. 1,198, 450, Ryohei Oda et al., “Synthesis of Surfactants and Their Applications (Maki Shoten, 1964)” and WW Perry, “Surface Active Agents”. (Interscience Publications Incorporated, 1958), J.
P. It is described in books such as Sisley "Encyclopedia of Active Agents Vol. 2" (Chemical Publish Company, 1964).

In the present invention, the combined use of a fluorochemical surfactant has a great effect on preventing static marks. The following compound examples can be given as the fluorine-based surfactants that can be effectively used in combination. For example, British Patent No. 1,
330,356, 1,524,631, U.S. Pat. Nos. 3,666,478, 3,589,906, JP-B-52-26687, and JP-A-49-46.
There are fluorochemical surfactants described in Japanese Patent Nos. 733 and 51-32333. Typical examples of the compound are, for example, N-perfluorooctylsulfonyl-N-propylglycine potassium salt, 2- (N-perfluorooctylsulfonyl-N-ethylamine) ethyl phosphate, N- [4-perfluoronone]. Nyloxy) benzyl] -N, N-dimethylammonioacetate, N- [3-N ', N', N'-trimethylammonio) propyl] perfluorooctylsulfonamide iodide, N- (polyoxyethylenyl) ) -N-Propylperfluorooctylsulfoamide (C ₈ F ₁₇ S
O ₃ N (C ₃ H ₇ ) (CH ₂ CH ₂ O) H), and fluorine-containing succinic acid compounds.

Further, in each photographic constituent layer, a lubricating composition,
For example, U.S. Pat. Nos. 3,079,837 and 3,083.
No. 0,317, No. 3,545,970, No. 3,2
94,537, and Japanese Patent Laid-Open No. 52-
Modified silicones such as those disclosed in Japanese Patent No. 129520 may be included. In the photographic light-sensitive material using the support for image elements of the present invention, US Pat.
411,911, 3,411,912, the polymer latex described in JP-B-45-5331 and the like can be included, and further silica, strontium sulfate, barium sulfate, poly as a matting agent. Methyl methacrylate and the like can be included.

[0073]

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited thereto.

Example 1 [Preparation of PET support material] Using terephthalic acid and ethylene glycol, an intrinsic viscosity IV = 0.66 according to a conventional method.
(Phenol / tetrachloroethane = 6/4 (mass ratio)
PET (measuring at 25 ° C.) was obtained. This was pelletized, dried at 130 ° C. for 4 hours, melted at 300 ° C., extruded from a T-die and rapidly cooled, and the film thickness after heat setting was 175 μm.
An unstretched film having such a thickness as described above was produced. This was longitudinally stretched 3.3 times using rolls having different peripheral speeds, and then laterally stretched 4.5 times with a tenter. The temperatures at this time were 110 ° C. and 130 ° C., respectively. After this,
After heat setting at 240 ° C. for 20 seconds, relaxation was carried out in the lateral direction by 4% at the same temperature. After slitting the chuck portion of the tenter, both ends were knurled and wound at 4 kg / cm ² to obtain a roll having a thickness of 175 μm.

[Surface corona treatment] Both sides of the support material were treated at room temperature at 20 m / min using a solid state corona treatment machine 6KVA model manufactured by Pillar Co. From the readings of current and voltage at this time, 0.3
It was found that a treatment of 75 kV · A · min / m ² was performed. The processing frequency at this time was 9.6 kHz, and the gap clearance between the electrode and the dielectric roll was 1.6 mm.

[0076] [Preparation of support for image element] (1) Preparation of coating liquid for undercoat layer Prescription (for undercoat layer on photo-sensitive layer side) ・ Polyester water dispersion types are listed in Table 1.                                       The amount of addition is the amount that gives the film thickness shown in Table 1. ・ Non-crosslinkable polymethylmethacrylate fine particles (Manufactured by Soken Chemical Industry Co., Ltd., MP-1000, average particle size 0.4 μm) 0.9 g ・ Polyethylene glycol monononyl phenyl ether (Average ethylene oxide number = 8.5) 10 mass% solution 2.0 g ・ Distilled water 1000 ml

[0077]

[Table 1]

[0078] Prescription (for back side first layer [undercoat layer]) ・ Styrene-butadiene copolymer latex 131 g   (Solid content 40 mass%, styrene / butadiene mass ratio = 68/32) * 2,4-dichloro-6-hydroxy-S-   Triazine sodium salt 8 mass% aqueous solution 5 g ・ Polystyrene particles (average particle size 2 μm) 20 mass% aqueous dispersion 0.5 g ・ Distilled water 863.5 ml

(2) Preparation Formula of Coating Liquid for Conductive Layer [1] (For Back Side Second Layer [Conductive Layer]) SnO ₂ / Sb ₂ O ₅ 62 g (9/1 Mass Ratio, Average Particles) Diameter 0.04 μm, 17 mass% dispersion) -Gelatin (10 mass% aqueous solution) 56.5 g-Shin-Etsu Chemical Co., Ltd. METOLOSE TC-5 (2 mass% aqueous solution) 6 g-ICI Proxel (manufactured by ICI) 0.5 ml-Sodium hydroxide (1% by mass aqueous solution) 7.0 ml-Distilled water 858.5 ml

(3) Preparation of Support for Image Element After subjecting both sides of a biaxially stretched polyethylene terephthalate support having a thickness of 175 μm to corona discharge treatment,
The above coating liquid formulation for the undercoat layer was applied to one surface (photosensitive layer surface) with a wire bar so that the wet coating amount was 6.6 ml / m ² (per surface), dried at 180 ° C. for 5 minutes, and then On the back surface (back surface), the above coating solution for the undercoat layer was coated with a wire bar in a wet coating amount of 5.7 ml.
/ M ² and dried at 180 ° C for 5 minutes,
Further, on the back surface (back surface), the wet coating amount of the conductive layer coating liquid formulation [1] [1] was 5.7 ml /
m ² was applied and dried at 180 ° C. for 6 minutes to prepare a support-1 for image element.

Example 2 Except that the conductive layer coating liquid formulation [1] in Example 1 was changed to the following formulation [2] and the wet coating amount was 5.7 ml / m ^2. In the same manner as in Example 1, an image element support-2 was prepared. Formulation [2] (for back surface side second layer [conductive layer]) SnO ₂ / Sb ₂ O ₅ 62 g (9/1 mass ratio, average particle size 0.04 μm, 17 mass% dispersion) Gelatin ( 10 mass% aqueous solution) 56.5 g-Minose TC-5 (2 mass% aqueous solution) manufactured by Shin-Etsu Chemical Co., Ltd.-Proxel 0.5 ml manufactured by ICI-Sodium hydroxide (1 mass% aqueous solution) 27.0 ml-Distilled water 838.5 ml

(Example 3) Except that the conductive layer coating liquid formulation [1] in Example 1 was changed to the following formulation [3] and the wet coating amount was 5.7 ml / m ^2. In the same manner as in Example 1, an image element support-3 was prepared. Formulation [3] (for second layer on back side [conductive layer])-SnO ₂ / Sb ₂ O ₅ 62 g (9/1 mass ratio, average particle size 0.04 μm, 17 mass% dispersion) -Gelatin ( 10 mass% aqueous solution) 98 g-Shin-Etsu Chemical Co., Ltd. METOLOSE TC-5 (2 mass% aqueous solution) 6 g-ICI Proxel 0.5 ml-Sodium hydroxide (1 mass% aqueous solution) 13.5 ml-Distilled water 852 ml

Example 4 Except that the conductive layer coating liquid formulation [1] in Example 1 was changed to the following formulation [4] and the wet coating amount was 5.7 ml / m ^2. In the same manner as in Example 1, a support-4 for image element was prepared. Formulation [4] (for back surface side second layer [conductive layer]) SnO ₂ / Sb ₂ O ₅ 62 g (9/1 mass ratio, average particle size 0.04 μm, 17 mass% dispersion) Gelatin ( 10% by mass aqueous solution) 98 g-Shin-Etsu Chemical Co., Ltd. METOLOSE TC-5 (2% by mass aqueous solution) 6 g-ICI Proxel 0.5 ml-Sodium hydroxide (1% by mass aqueous solution) 37.0 ml-Distilled water 828. 5 ml

Example 5 Except that the conductive layer coating liquid formulation [1] in Example 1 was changed to the following formulation [5] and the wet coating amount was 7.7 ml / m ^2. In the same manner as in Example 1, an image element support-5 was prepared. Formulation [5] (for back surface side second layer [conductive layer]) SnO ₂ / Sb ₂ O ₅ 62 g (9/1 mass ratio, average particle size 0.04 μm, 17 mass% dispersion) Gelatin ( 10 mass% aqueous solution) 35.8 g-Minose TC-5 (2 mass% aqueous solution) manufactured by Shin-Etsu Chemical Co., Ltd.-Proxel 0.5 ml manufactured by ICI-Sodium hydroxide (1 mass% aqueous solution) 7.5 ml-Distilled water 858 ml

Example 6 Except that the conductive layer coating liquid formulation [1] in Example 1 was changed to the following formulation [6] and the wet coating amount was 7.7 ml / m ^2. In the same manner as in Example 1, a support-6 for image element was prepared. Formulation [6] (for second layer on back surface side [conductive layer]) SnO ₂ / Sb ₂ O ₅ 62 g (9/1 mass ratio, average particle diameter 0.04 μm, 17 mass% dispersion) Gelatin ( 10 mass% aqueous solution) 35.8 g-Minose TC-5 (2 mass% aqueous solution) manufactured by Shin-Etsu Chemical Co., Ltd.-Proxel 0.5 ml manufactured by ICI-Sodium hydroxide (1 mass% aqueous solution) 21.5 ml-Distillation Water 844ml

COMPARATIVE EXAMPLE 1 Except that the conductive layer coating liquid formulation [1] in Example 1 was changed to the following formulation [7] and the wet coating amount was 5.7 ml / m ^2. In the same manner as in Example 1, a support for image element-7 was prepared. Formulation [7] (for back surface side second layer [conductive layer]) SnO ₂ / Sb ₂ O ₅ 62 g (9/1 mass ratio, average particle diameter 0.04 μm, 17 mass% dispersion) Gelatin ( 10 mass% aqueous solution) 35.8 g-Metronose TC-5 (2 mass% aqueous solution) manufactured by Shin-Etsu Chemical Co., Ltd.-Proxel 0.5 ml manufactured by ICI-Distilled water 865.5 ml

COMPARATIVE EXAMPLE 2 Except that the conductive layer coating solution formulation [1] in Example 1 was changed to the following formulation [8] and the wet coating amount was 5.7 ml / m ^2. In the same manner as in Example 1, a support for image element-8 was prepared. Formulation [8] (for back surface side second layer [conductive layer]) SnO ₂ / Sb ₂ O ₅ 62 g (9/1 mass ratio, average particle diameter 0.04 μm, 17 mass% dispersion) Gelatin ( 10% by mass aqueous solution) 35.8 g-Minose TC-5 (2% by mass aqueous solution) manufactured by Shin-Etsu Chemical Co., Ltd.-Proxel 0.5 ml manufactured by ICI-Acetic acid (20% by mass aqueous solution) 1.0 ml-Distilled water 864. 5 ml

COMPARATIVE EXAMPLE 3 Except that the conductive layer coating liquid formulation [1] in Example 1 was changed to the following formulation [9] and the wet coating amount was 7.7 ml / m ^2. In the same manner as in Example 1, a support-9 for image element was prepared. Formulation [9] (for back surface side second layer [conductive layer]) SnO ₂ / Sb ₂ O ₅ 62 g (9/1 mass ratio, average particle diameter 0.04 μm, 17 mass% dispersion) Gelatin ( 10 mass% aqueous solution) 35.8 g-Shin-Etsu Chemical Co., Ltd. METOLOSE TC-5 (2 mass% aqueous solution) 6 g-ICI Proxel 0.5 ml-Sodium hydroxide (20 mass% aqueous solution) 3.0 ml-Distilled water 862.5 ml

(Comparative Example 4) Except that the conductive layer coating liquid formulation [1] in Example 1 was changed to the following formulation [10] and the wet coating amount was 7.7 ml / m ^2. In the same manner as in Example 1, image element support-10
Was produced. Formulation [10] (for back surface side second layer [conductive layer]) SnO ₂ / Sb ₂ O ₅ 62 g (9/1 mass ratio, average particle size 0.04 μm, 17 mass% dispersion) Gelatin ( 10 mass% aqueous solution) 23.4 g-Shin-Etsu Chemical Co., Ltd. METOLOSE TC-5 (2 mass% aqueous solution) 6 g-ICI Proxel 0.5 ml-Distilled water 865.5 ml

Comparative Example 5 A conductive layer coating liquid formulation [1] in Example 1 was changed to the following formulation [11] except that the wet coating amount was 5.7 ml / m ^2. In the same manner as in Example 1, the support for image element-11
Was produced. Formulation [11] (for back surface side second layer [conductive layer]) SnO ₂ / Sb ₂ O ₅ 62 g (9/1 mass ratio, average particle size 0.04 μm, 17 mass% dispersion) Gelatin ( 10% by mass aqueous solution) 15.1 g-Shin-Etsu Chemical Co., Ltd. METOLOSE TC-5 (2% by mass aqueous solution) 6 g-ICI Proxel 0.5 ml-Distilled water 865.5 ml

(Evaluation of Support for Image Element) Example 1
6 to 6 and Comparative Examples 1 to 5 [1] to [1
The pH of the conductive layer coating solution up to 1] was measured. The results are shown in Table 2 below. Furthermore, regarding the image element supports 1 to 11 produced in Examples 1 to 6 and Comparative Examples 1 to 5, the surface resistance value SR [Ω / □] was measured according to JIS-K-69.
According to the method described in 11-1995, it was measured using a surface resistance meter (Kawaguchi Electric Co., Ltd .; VE-30 type). L
The results of the value of ogSR [LogΩ / □] are shown in Table 2 below.

[0092]

[Table 2]

From the results in Table 2 above, in the image element supports 1 to 6 of the examples, when the pH of the coating solution for the conductive layer was 8.0 or more, the volume of tin oxide which was a metal oxide was increased. When the content is 20% to 40%, the surface resistance LogS
It was confirmed that the R value was 10 [LogΩ / □] or less, and that it had excellent charging characteristics. On the other hand, in the image element supports 7 to 11 of Comparative Examples, p of the conductive layer coating liquid was used.
When H is less than 8.0, the tin oxide volume content is 50.
%, 60%, the LogSR value is 10 [LogΩ / □]
Although below, it was confirmed that when the tin oxide volume content was 40%, the LogSR value of the surface resistance was larger than 11 [LogΩ / □].

[0094]

According to the present invention, firstly, an image element provided with a conductive layer having good adhesion to a photographic photosensitive layer or the like to be applied later and having sufficient strength. And a method for manufacturing the support for the image element. Secondly, even when the amount of metal oxide particles contained is small, it exhibits excellent charging characteristics, and no static marks or dust adheres to the film surface during the photographic photosensitive layer formation process. It is possible to provide a support for an image element capable of uniformly coating a functional layer and a method for producing the support for an image element. Thirdly, an image element support suitable for a photographic light-sensitive material for observing an image with transmitted light, which has a small light scattering and a high light transmittance in a non-image part, and a method for producing the image element support are provided. can do.

Claims (12)

[Claims] 1. A subbing layer containing a hydrophobic polymer on at least one side of a support material, and a pH on the subbing layer.
And at least one conductive layer formed by applying and drying a coating solution having a value of 8.0 or more. 2. The logarithmic value LogSR of the surface resistance SR of the conductive layer is 11 [Ω / □] or less.
The support for image elements as described in 1. 3. The conductive layer contains metal oxide particles and a hydrophilic binder, and the volume content of the metal oxide particles in the conductive layer is 20% or more and 40% or more.
The support for an image element according to claim 1 or 2, which is: 4. The metal oxide particles are ZnO or TiO.
₂ , SnO ₂ , Al ₂ O ₃ , In ₂ O ₃ , MgO, BaO, M
The image according to claim 3, which contains at least one of a crystalline metal oxide selected from the group consisting of oO ₃ , a composite oxide thereof, and a metal oxide containing a small amount of a heteroatom therein. Support for elements. 5. The volume resistivity of the metal oxide particles is 10
^The support for image elements according to claim 3 or 4, wherein the metal oxide particles have a size of ⁷ Ω-cm or less, and the particle diameter of the metal oxide particles is 0.01 µm to 1 µm. 6. The support for image elements according to claim 1, wherein the support material is a film containing at least one of polyethylene terephthalate and polyethylene naphthalate. 7. A first step of forming a subbing layer containing a hydrophobic polymer on at least one surface of a support material, and a conductive layer coating solution is applied onto the subbing layer and dried to form at least one layer. And a second step of forming a conductive layer, wherein the pH of the conductive coating liquid in the second step is 8.0 or more. 8. The logarithmic value LogSR of the surface resistance SR in the conductive layer is 11 [Ω / □] or less.
A method for producing a support for image elements according to item 1. 9. The conductive layer contains metal oxide particles and a hydrophilic binder, and the volume content of the metal oxide particles in the conductive layer is 20% or more and 40% or more.
The method for producing a support for an image element according to claim 7 or 8, which is as follows. 10. The metal oxide particles are ZnO or Ti.
O₂, SnO₂, Al ₂O₃, In₂O₃, MgO, BaO,
MoO₃A crystalline metal oxide selected from the group consisting of:
These complex oxides, and those containing small amounts of heteroatoms
A contract containing at least one of the metal oxides
The method for producing a support for image elements according to claim 9. 11. The volume resistivity of the metal oxide particles is 1
0 ⁷ Ω-cm or less, and, according to claim 9 or 10 particle size of the metal oxide particles are 1μm from 0.01μm
A method for producing a support for image elements according to item 1. 12. The support material comprises a film containing at least one of polyethylene terephthalate and polyethylene naphthalate.
The method for producing a support for image elements according to any one of 1.