JPS5993446A - Photographic support - Google Patents

Abstract

PURPOSE:To give strong adhesive strength between a polyester film and a photographic hydrophilic colloidal layer by using an aq. compsn. contg. a copolymer of a specified monomer for a subbing layer. CONSTITUTION:A polyester support is coated directly with an aq. compsn. contg. a copolymer of a monomer represented by the formula as shown in a figure to form a subbing layer. Said copolymer has <=40 deg.C lowest film forming temp. In the formula R1 is H or methyl; and R2 is 1-8C straight to branched alkyl.

Description

[Detailed description of the invention] The present invention (d) relates to a photographic support having a subbing layer.

More specifically, in order to firmly adhere a hydrophilic colloid layer such as a photosensitive emulsion layer or a backing layer onto a polyester support, a specific aqueous copolymer composition is coated and subbing treatment is performed. The present invention relates to a photographic support.

Therefore, the demand for it has increased in recent years and it has become widely used.

However, polyester films are extremely hydrophobic, and it is often difficult to create strong adhesion between such supports and hydrophilic colloid layers, such as photographic gelatin layers that use materials such as gelatin as a binder. Accompany. Conventionally, in photographic materials using polyester films, many subbing methods have been known for adhering the support and the hydrophilic colloid layer. K is for adhesion to
In either method, it is often necessary to use a swelling or dissolving agent for the polyester film.

However, when a subbing composition containing a swelling agent or a fermentation agent is applied to a polysaccharide stell film, the planarity of the support is damaged during the subbing process, and the swelling agent or dissolving agent Since most of these agents use harmful organic solvents, they have many drawbacks such as impairing occupational safety and health.

For this reason, it has been proposed to undercoat polyester films without using swelling agents or solubilizing agents.

One technology is to create a polyester film whose surface has been chemically or physically treated, including chemical treatment, mechanical treatment, corona discharge treatment, flame treatment, ultraviolet treatment, high frequency treatment, glow discharge treatment, activated plasma treatment, and laser treatment. ,
Supports subjected to surface activation treatments such as agitation treatment and ozone oxidation treatment have been proposed. This technology is covered by U.S. Patent Nos. 2 and 9.
No. 43,937, No. 3.475,193, No. 3.
No. 615.1557, British Patent No. 1.215,234, U.S. Patent No. 3,590,107, JP-A-5
This method is proposed in No. 3-13672 and No. 55-18469. However, these surface-treated polyester films have some copolar groups on the surface of the film, which was originally hydrophobic, and a thin layer that is a negative factor for adhesion on the extreme surface has been removed. Although the adhesive force with the photographic hydrophilic protective colloid layer increased, sufficient adhesive strength was not obtained.

Furthermore, in order to increase the adhesion to the photographic hydrophilic colloid layer, polyester films have been proposed in which a water-based coating composition layer is provided after surface treatment. This aqueous coating composition layer, so-called subbing layer, must have sufficient adhesion to both the polyester film and the photographic hydrophilic colloid layer. In particular, in order to ensure sufficient adhesion between the subbing layer and the photographic hydrophilic colloid layer, hydrophilic groups or reactive groups are generally included in the resin component of the subbing layer (hereinafter referred to as "undercoating resin"). is being carried out. This hydrophilic group or reactive group includes rIII (for example, acrylic acid, itaconic acid, half-alkyl ester of itaconic acid, etc.),
Epoxy groups (e.g. glycidyl acrylate, glycidyl methacrylate, etc.), N-alkanol groups [e.g. N-methylolacrylamide, hydroxymethylated N
-(1,1-dimethyl-3-oxobutyl)acrylamide, etc.], hydroxyl groups (for example, bitroxyethyl methacrylate, hydroxyethyl acrylate, etc.), and the like.

Among the above, examples in which the undercoat layer contains an undercoat resin containing an acid component are disclosed in Japanese Patent Publication No. 48-3564, Japanese Patent Publication No. 46-1123, Japanese Patent Publication No. 50-1718, European Patent No. 1484, Kaisho 54-61518, Kaisho 50-39536
No. 1, US Pat. No. 3,545,972, and the like. However, in a polyester film having a subbing layer containing a 1/CM content in the subbing resin.

The adhesiveness of the photographic hydrophilic protective colloid layer during in-situ processing was insufficient.

Contains an undercoat resin containing an epoxy base component in the undercoat layer 1214
No. 37, Publications No. 51-121323, British Patent No. 1
, No. 168,171, Japanese Unexamined Patent Publication No. 55-69138, etc. However, epoxy group components such as glycidyl methacrylate and glycidyl acrylate have self-crosslinking properties and are easily decomposed. Alternatively, the stability of the undercoat processing liquid (hereinafter referred to as undercoat liquid), which is an aqueous composition containing the undercoat resin, was insufficient.

Examples of the undercoat layer containing a subbing resin containing a hydroxyl group component are JP-A-49-113868, JP-A No. 51-123139, JP-A No. 51-135526, JP-A No. 52-19786, JP-A No. 55
-69138 publication discloses isobaric pressure. However, these undercoat resins containing hydroxyl groups were not sufficient as undercoat layers or undercoat resins.

Examples of the undercoat layer containing an undercoating resin containing an N-alkanol group component include French Painting Patent No. 1,404,048, Japanese Patent Application Laid-open No. 131516/1983, British Patent No. 1,178,
It is disclosed in the specification of No. 597, Japanese Patent Publication No. 57-3054, etc. However, the N-alkanol acrylamides described in these documents have strong self-crosslinking properties, and crosslinking occurs during the synthesis of the below-mentioned resin or during storage of the synthesis solution, resulting in insufficient stability of the synthesis solution and the subtraction solution. Ta. In addition, in the specification of French Painting Patent No. 1,404,048, an example is disclosed in which the undercoating resin containing N-(alkoxymethyl)acrylamide is included in the undercoat layer. is applied by dissolving it in an organic solvent, and as mentioned above, this type of subbing method impairs the flatness and transparency of the support, and is undesirable in terms of workability and pollution.

In addition, in the undercoating method disclosed in French Painting Patent No. 1,404,048, undercoating is performed directly on the polycarbonate support and polycarbonate polyurethane support using the undercoating resin described above, but polyester In the case of a support, a methylene chloride-soluble polyester fermented in an organic solvent is coated, and then subbed with the above-mentioned resin.

That is, in the undercoat technique described in the above-mentioned French painting patent specification, a methylene chloride-soluble polyester is coated on a polyester support, and a subbing liquid obtained by dissolving the acrylamide-based undercoating resin in an organic solvent is used as a subbing layer. It is believed that the coating allows the resin cited below to adhere to the polyester support. Therefore, the above-mentioned lower resin does not have adhesive properties directly to the polyester support, but only to a polyester that is soluble in methylene chloride, that is, a polyester with a considerably smaller molecular weight than the polyester of the polyester support. It can be understood as indicating gender.

Summary The subbing method disclosed in the above-mentioned patent specification uses an organic solvent and another material layer between the support and the subbing layer when providing the above-mentioned subbing resin on the polyester support as a subbing layer. It belongs to the required technology.

As described above, photographic polyester films containing subbing resins containing hydrophilic groups or reactive groups in their subbing layers have not always been satisfactory in stability and subbing performance during production.

On the other hand, as an example of a subbing resin that does not necessarily contain the above-mentioned hydrophilic group or reactive group,
Publication No. 70 discloses an undercoat in which a undercoat resin containing styrene as a main component is coated on a polyester film and then subjected to a corona discharge treatment. However, with this subcoating, the film-forming properties of the subcoating resin are insufficient, and the transparency of the subcoating polyester film tends to deteriorate due to fluctuations in the drying conditions of the subcoating. It was difficult to get it consistently.

By the way, there is technology to provide a polyester film with a resin layer that looks like it can be used for photography, but subbing for photography requires performance that is completely different from other uses, and there are no similar or similar products. It is what it is.

For example, in U.S. Pat. No. 3,247,139, N
A coating composition containing -(alkoxymethyl)acrylamide is disclosed. However, this coating layer is considered to be only one adhesive layer, and belongs to a technology completely different from the technical concept of adhering both the support and the photographic hydrophilic layer: 1141, like a photographic subbing layer. The technique disclosed in the above-mentioned specification for reference only showed completely insufficient adhesion to photographic hydrophilic colloid layers.

The first object of the present invention is to provide a photographic support having strong adhesion between a polyester film and a photographic hydrophilic colloid layer.

The second object of the present invention is that since it is not necessary to use a swelling agent or a dissolving agent for organic solvent polyester, harmful organic solvents are not released into exhaust gas or wastewater, so that no pollution occurs. The purpose of the present invention is to provide a photographic support that can be used in various ways.

A third object of the present invention is to provide a photographic support with good flatness.

A fourth object of the present invention is that it does not require the use of polyester swelling or dissolving agents, and therefore there is no deterioration in flatness and transparency of the polyester film caused by this, and the coating of the underlying resin layer does not require the use of polyester swelling or dissolving agents. It is an object of the present invention to provide a photographic support whose transparency does not deteriorate due to

A fifth object of the present invention is to provide a photographic support having a subbing layer comprised of a stable and easily manufactured subbing resin.

A sixth object of the present invention is to provide a photographic support having a subbing layer made of a subbing resin with good storage stability.

A seventh object of the present invention is to provide a photographic support using a subbing liquid having good storage stability and mechanical stability. That is, the undercoat resin used in the present invention contains a copolymer component that is neither self-crosslinkable nor degradable at the latex synthesis temperature (100°C or lower), and therefore, during synthesis, during storage of the undercoat resin, and during storage of the undercoat liquid. There is no deterioration in the quality of the undercoating resin during synthesis, and there is no unfavorable change in physical properties such as the pH of the undercoating resin liquid or the subbing liquid, and the undercoating resin used in the present invention is mechanically very stable, and during synthesis, Coagulation during subtraction liquid application? It is an object of the present invention to provide a photographic support using no subbing liquid.

The eighth object of the present invention is to provide a system that does not cause fluctuations in undercoat performance even due to variations in coating and drying conditions during the undercoat process.
The object of the present invention is to provide a photographic support that can be stably prepared.

A ninth object of the present invention is to provide a photographic support that does not adversely affect various photographic hydrophilic/roid layers, especially photographic emulsion layers.

As a result of various studies, the present inventors have found that each of the above objects is achieved by coating a monomer represented by the following general formula (I) with a minimum film formation temperature of 40°C or less on at least one surface of a polyester support. It has been found that this can be achieved with a photographic support having a subbing layer obtained by directly coating a layer of an aqueous composition containing a copolymer.

General formula (I) R.

HlIC=C C’0NHCH, Out.

In the formula, R1 represents a hydrogen atom or a methyl group, and the island represents a straight chain or branched alkyl group having 1 to 8 carbon atoms.

That is, the present invention has been made for the VCM resin mentioned below containing a hydrophilic group or a reactive group, and according to the present invention, an etherified methylol group as represented by the general formula (I) is An undercoat layer with excellent adhesive properties could be obtained by directly coating a polyester support as an aqueous dispersion of an undercoat resin consisting of a copolymer of N-(alkoxymethyl)acrylamide monomers having the following properties. .

As is clear from the above, in the subtraction method according to the present invention,
Are organic solvents or swelling agents used when subtracting polyester supports?
There is no need to use or require any other layer of material between the support and the subbing layer. Therefore, the disadvantages caused by the use of organic solvents and swelling agents as described above do not occur, and the number of steps required for undercoating can be reduced since no other material layer is required.

In the present invention, the above-mentioned 1; Direct 1 means that at least the surface of the polyester support is not pretreated with an organic solvent that swells or dissolves the support, or that the support and subbing layer are not pretreated. It expresses that no other material layer is provided between the two. Furthermore, the term "polyester support" in the present invention as described above refers to a support composed of a polyester that is insoluble in methylene chloride.

The present invention will be further explained in detail below.

Specific examples of the monomer represented by the general formula (I) used as the copolymer of the undercoat layer according to the present invention include N-butoxymethylacrylamide, N-methoxymethylmethacrylamide, N-isopropoxymethyl Acrylamide, N-butoxymethylacrylamide, N
-butoxymethylmethacrylamide, N-isobutoxymethylmethacrylamide, N-isobutoxymethylmethacrylamide, N-octyloxymethylacrylamide, and the like.

In the present invention, if the above-mentioned monomer components in the copolymer are too large, the adhesiveness will not be extremely deteriorated, but the mechanical stability of the latex will deteriorate and uneven undercoating will occur. Furthermore, if the monomer component is too small, the adhesion will deteriorate, which is undesirable. Therefore, the proportion of the monomer component in the above copolymer is desirably 1 to 40% by weight, particularly 5 to 30% by weight.

Examples of the copolymer monomer used as the engineering composition in the present invention include methyl acrylate, methyl methacrylate, ethyl acrylate, butyl acrylate, butyl methacrylate 14-late, t.rt.butyl acrylate, and glycidyl. Acrylate, 2-hydroxyethyl ac IJ L/+
POLI fly rh report DBOOK (WIIJy
-INTER5CIENCE, J, BRANDR
One or more monomers as described in UP, E, H, IM RGUT) can be used. The preferred ratio of this component to the copolymer is 60-99 M!
%, particularly preferably 70 to 95% by weight.

In the following composition according to the present invention, when selecting other monomers for the copolymer as described above, select monomers such that the minimum film forming temperature of the latex containing the special copolymer is 40°C or less. It has to be the body.

That is, with the undercoat composition according to the present invention, if the above-mentioned minimum film formation temperature exceeds 40°C, it becomes difficult to form the undercoat layer.
Moreover, even if a film is formed, the transparency of the subbing paste becomes extremely poor.

Next, the method for measuring the minimum film forming temperature referred to in the present invention will be explained in detail. Film Forn + IngT manufactured by Toyo Seiki Seisakusho
Use @+at@r, width 10 cIt, length 30 cW
A constant temperature gradient is created on the L steel plate, and when the temperature gradient reaches equilibrium, a thin layer of latex is applied without coating and allowed to dry. When the copper plate is observed after drying, a transparent continuous film is formed in the temperature range above the minimum film formation temperature, but it becomes a white powder in the temperature range below the minimum film formation temperature. The temperature at this boundary line is determined as the minimum film forming temperature.

The concentration and amount of latex used in the above measurement have no effect on the minimum film formation temperature measurement value.

The above measurement method is described in detail in Chemistry of Polymer Latex (Kobunshi Kankai, authored by So Muroi), pages 260-261.

In the present invention, particularly preferred combinations of monomers constituting the copolymer include N-butoxymethylacrylamide-butyl acrylate-styrene, N-isobutoxymethylacrylamide-butylacrylate-styrene, and N-butoxymethylacrylamide-butylacrylate-styrene. -ethyl acrylate-styrene, N-isobutoxymethylacrylamide-ethyl acrylate-styrene, N-butoxymethylacrylamide-butyl acrylate-toptyl methacrylate, N-isobutoxymethylacrylamide-butyl acrylate-toptyl methacrylate, N-butoxymethylacrylamide -butyl acrylate-t
@rt-butyl acrylate, N-isobutoxymethylacrylamide-butyl acrylate-t・rt-butyl acrylate, N-butoxymethylacrylamide-
Butadiene-styrene, N-isobutoxymethylacrylamide butadiene-styrene, N-butoxymethylacrylamide-butyl acrylate-styrene-2-
Examples include hydrocarbon diethyl acrylate), N-7'toxymethylacrylamide doptyl acrylate styrene-acrylamide, but this description is not intended to limit the scope of the present invention.

The above copolymer used in the present invention can be synthesized by a known emulsion polymerization method. For example, polymerization methods such as those described in Chemistry of Polymer Latex (Kobunshi Kankakai, authored by So Muroi), Volume 18 and Emulsion Latex Hand 17-Dopunoku (Taiseisha Publishing), Volumes 1 to 3m. It is also possible to use polymerization initiators, emulsifiers, etc. Further, as the emulsifier, those listed in the list of surfactants etc. (1981 edition) published by the Japan Surfactant Industry Association can be used.

In the subbing composition of the present invention, the copolymer is dispersed as fine particles in an aqueous dispersion medium and used as an aqueous copolymer composition in the subbing liquid. Note that, depending on the purpose, part of the water may be replaced with an organic solvent that is miscible with water (for example, methanol or acetone). The copolymer of the present invention obtained by the emulsion polymerization method is an aqueous dispersion of a fine particle emulsion polymer,
The copolymer is prepared as an aqueous dispersion, which may be diluted with water or an organic thickening agent that is miscible with water, depending on the purpose of use and coating method, but the solid concentration of the copolymer can be reduced to 0.
Preferably, it is used in an amount of 1 to 40 weight percent.

18- The subbing liquid mainly composed of the copolymer latex (resin cited below) of the present invention obtained in this way contains 0.1 to 40% by weight of the above-mentioned copolymer component, and if necessary, Surfactants, hydrophilic organic colloids, matting agents, lubricants, antistatic agents,
It may contain additives such as crosslinking agents. As a crosslinking agent,
So-called hardening agents for photographic gelatin, such as formaldehyde, aldehyde compounds such as glyozal, mucochloric acid, tetramethylene-1,4-bis(ethyleneurea), hexamethylene-1,6-bis(ethyleneurea), etc. compounds having an ethyleneimine group, methanesulfonic acid esters such as trimethylene-1,3-bismethanesulfonic acid ester, active vinyl compounds such as bisacryloyl urea, metaxylene vinylsulfonyl acid, 2-methoxy-4,6-dichlorotri Compounds having an active halogen such as ryozine and 2-sogiumoxy-4,6-dichlorotriazine, compounds having an intermediate group such as bisphenol glycidyl ether, incyanate, and the like can be used. Among these, compounds having an ethyleneimine group, methanesulfonic acid esters, and compounds having an active halogen are particularly preferred.

The subbing liquid is applied onto a polyester film. Here, polyester is one with a linear structure obtained by polycondensation of dicarboxylic acid and glycol, transesterification of dicarboxylic acid ester and glycol or diol diacetate and dicarboxylic acid, and condensation reaction of dicarboxylic acid chloride and diol. Of these, polyethylene terephthalate is the most convenient in terms of availability.

There is no particular limit to the thickness of polyester, but it is approximately 12μ.
A material of about 500 μm, preferably about 40 μm to 200 μm is advantageous from the viewpoint of ease of handling and versatility. In particular, biaxially stretched crystallized materials are advantageous in terms of stability, strength, and the like.

It is preferable that the surface of the polyester film be subjected to various surface activation treatments to make it hydrophilic before applying the subbing liquid onto the polyester film. Examples of the surface activation treatment include oxidizing agent solution treatment as described in U.S. Pat. No. 2,943,937, etc., and U.S. Pat. No. 3,475,193.
Ultraviolet absorption treatment as described in U.S. Pat.
, No. 615,557, and the flame treatment described in US Pat. No. 3,590,107.

The above-mentioned subbing liquid is applied onto the polyester film by a known method. For example, it can be applied onto a polyester film by curtain coating, su/(-roll coating, fountain airt pp-coating, slide hopper coating, extrusion seal coating, tip coating, etc.). For example, hot air drying, infrared heat drying, heater roll drying, and microwave drying can be carried out.In the present invention, preferably, an upper layer is further applied on top of the subbing layer. Set up

For the upper layer, known gelatin, casein, etc. 91
- Natural hydrophilic organic colloids, synthetic hydrophilic organic colloids, and antistatic agents, such as those disclosed in Japanese Patent Publication No. 46-24159 and Japanese Patent Application Publication No. 1987-24159, can be applied. This upper layer liquid may contain a matting agent, a hardening agent, a surfactant, etc.

As with the processing of the lower layer, any known method can be used for coating and drying the upper layer liquid. Before coating or after drying these subbing liquids and the upper layer coating liquid provided as necessary, flame radiation treatment, plasma treatment, corona discharge treatment, glow discharge treatment, ultraviolet irradiation treatment, etc. A known surface treatment may be performed.

The photographic support according to the present invention, which is thus provided with a subbing layer on at least one side, can have a photographic hydrophilic colloid layer coated on at least one side by a commonly used method. Specifically, various compositions for forming photographic light-sensitive layers, such as silver halide photographic emulsions, diazo light-sensitive compositions, gelatin compositions containing antihalation agents, or gelatin for adjusting the curl balance of supporting films. The photographic light-sensitive material thus obtained has excellent adhesive properties, and the photographic light-sensitive layer does not peel off from the support even when subjected to photographic processing such as development. There is no adverse effect on photographic performance.

Next, a typical synthesis example of the copolymer of the undercoat layer according to the present invention will be shown. (All quantities are in parts by weight) Synthesis Example 1 700 ml of distilled water degassed under a stream of nitrogen in a 2000 d capacity four-loaf flask equipped with a stirrer, reflux condenser, thermostatic heating device, thermometer and dropping funnel. 1 part and 6 parts of sodium dodecylbenzenesulfonate were added, and stirring was continued at a stirring speed of 200 revolutions per minute while heating the mixture and adjusting the internal temperature to 200°C. Add 1 part of ammonium persulfate to this, and after 1 to 2 minutes, add 1 part of N-butoxymethylacrylamide.
A monomer mixture consisting of 5 parts, butyl acrylate, 210 parts, and 75 parts of styrene was added dropwise over a period of 1 hour. After the dropwise addition was completed, the reaction was continued for another 4 hours under the same conditions to complete the polymerization reaction, and a latex with a dry solid content of 30% by weight was obtained.

Synthesis Example 2 A monomer mixture consisting of 18 parts of N-but4-sulfonylamide, 54 parts of methyl acrylate, and 48 parts of butadiene, 3 parts of sodium dodecylbenzenesulfonylate, 0.5 part of ammonium persulfate, 0 parts of tertiary dodecyl mercaptan
．． 25 parts of distilled water and 280 parts of distilled water at 500x/
The mixture was placed in a large capacity simple autoclave, the tube was completely sealed, and the stirring speed was adjusted to 600 revolutions per minute. When the internal temperature was raised to 80℃, the polymerization pressure cuff became Oatm, and then for 10 hours (
Capital) If the polymerization reaction is continued at ±0.2℃, the polymerization pressure will be -0,
The polymerization reaction was completed at 1 atm.

A latex with a weighted dry solids content of t% was thus obtained.

The present invention will be described in more detail with reference to Examples below, but the present invention is not limited thereto.

Example 1 A 100μ polyethylene terephthalate film after biaxial stretching and heat setting was subjected to a 30ηQKn corona discharge treatment. Next, apply the first layer of subbing with the following composition to a thickness of 1 μm.
A layer was formed by drying at 00° C. for 1 minute.

(Composition of the first undercoat layer) A second undercoat layer of the following composition is further added on top of the first undercoat layer.
The film was coated to a film thickness of 100° C. and dried at 100° C. for 1 minute to form a layer.

(Composition of Second Subbing Layer) A printing layer for photosensitive materials/1 was applied to the polyester film having the subbing layer obtained above, and this was designated as Sample 1. Subsequently, as a comparative example, as shown in Table 1 below5
Samples 2 and 3 as shown in the table below were prepared by subbing and coating the backing layer -δ- in exactly the same manner except for changing the copolymer of the subbing liquid. Evaluation results for each sample? As shown in Table 1 below, each evaluation method listed in this table is based on the method described below.

Hereinafter, we will use a razor to make shallow scratches on the surface of the photographic hydrophilic colloid layer of the sample in the shape of a substrate pattern.Adhesion test with dry film... After pressing a cellophane adhesive tape onto the sample, the tape was suddenly peeled off, and the residual rate of the emulsion film relative to the adhesive area of the cellophane tape was expressed as a percentage.

With processing film: Scratch the surface of the photographic hydrophilic colloid layer of the sample in a processing bath with a sharp tip, and then rub the surface to determine the remaining rate of the emulsion film as a percentage. Indicated. If the percentage was 80 inches or more, it was considered that there was no practical problem.

Lum support was measured and expressed as a percentage. If it was 1.0% or less, there was no practical problem.

3. Mechanical stability test JISK6381 using a high-speed stirring tester made by Jyuji Seisakusho.
According to
The mixture was stirred with a spindle rotating at high speed at 4,000 Or, p, m, and the time until agglomerates were generated was expressed in minutes. (9
) There is no practical problem as long as it is in terms of separation.

In the above table, Samples 2 and 3 are comparative samples, and the copolymer composition of Sample 2 is based on French Patent No. 1.404,04.
This is a latex synthesized by emulsion polymerization of the copolymer described in Example (5) of FJA Specification No. 8, and the copolymer of Sample 3 is based on the example of U.S. Patent No. 3,247,139. It is something.

As is clear from the table above, comparative sample 2 had a high minimum film formation temperature and was unable to form a film.

In addition, sample 3 was significantly inferior in transparency, as well as in both the processed film and the dried film. On the other hand, Sample 1 according to the present invention has a low minimum film formation temperature, and also has good mechanical stability, transparency, and
Both film adhesion properties were excellent.

Example 2 A subbed polyester film was prepared in exactly the same manner as in Example 1, except that the copolymer latex shown in Table 2 below was used as the undercoat resin, and the undercoat layer was coated with A photographic photosensitive layer for printed photosensitive materials was coated on the substrate. In addition, as in Example 1, samples were prepared using a lower resin based on a copolymer latex for comparison, samples using the lower reference resin according to the present invention were designated as Samples 4 and 5, and the above comparative samples were - (Equipment) - As is clear from the above table, the film-forming properties of the six comparative samples during treatment and after drying were deteriorated. On the other hand, in samples 4 and 5 according to the present invention, the minimum film forming temperature was
It was found that mechanical stability and transparency were good, and film-forming properties during processing and after drying were also excellent.

Example 3 21!1] [A 175μ polyethylene terephthalate film after stretching M setting was treated with a 300W high pressure water lamp for 5 minutes. Next, add a first layer of undercoat with the following composition to a film thickness of -
It was coated and dried at 100° C. for 1 minute to form a layer, and then a second layer of undercoat was applied in the same manner as in Example 1.

(Composition of first undercoat layer) Sample 7 was prepared by applying an X-ray photographic photosensitive layer to the polyester support coated with the undercoat layer obtained above.

Next, for comparison, butyl acrylate styrene copolymer latex was applied and dried, and then 3QW/77/I
m'+7) A photographic photosensitive layer for X-rays was directly coated on a polyethylene terephthalate film subjected to a corona discharge treatment to prepare Sample 8 for comparison. Evaluation experiments were conducted on each of these samples in the same manner as in Example 1, and the results are shown in Table 3 below.

-(- -Recitation- The above copolymer of Sample 8 is as described in Example 10 of Japanese Patent Publication No. 57-970. According to the above table, Samples 7 and 8 did not deteriorate the photographic performance. but,
Sample 7 according to the present invention showed even better performance than the comparative sample for each evaluation item.

A polyester film with an undercoat layer formed using the undercoat resin was prepared in exactly the same manner as in Example 1, and a backing layer for color cut film was coated on top of this undercoat layer. Samples 9 to 17 as shown in the table were prepared. Evaluation tests were conducted on each sample in the same manner as in the above examples, and the results are listed in Table 4 below.

/ Samples 9 to 16 in the above table are samples according to the present invention, and sample 17
is for comparison. Sample 17 had poor mechanical stability as an undercoat resin, but the sample according to the present invention showed excellent properties in all evaluation items.

Example 5 Before applying the second layer of undercoat, 30 W/dIIi was applied to the surface of the polyethylene, terephthalate support coated with the first layer of undercoat.
A subbing layer and a backing layer for a printed photosensitive material were coated in the same manner as in Example 1, except that the corona discharge treatment in A was performed, and then a photosensitive material for a printed photosensitive material was coated in the same manner as in Example 2. A layer was applied. Samples 18 and 19 according to the present invention shown in Table 5 below were prepared.

Evaluation tests were conducted on the above samples in the same manner as in the Examples above, and the results are shown in Table 5 below.

As is clear from the above table, both of the above samples according to the present invention exhibit excellent characteristics in all of the above evaluation items, and especially Samples 4 and 5 according to the present invention in Example 2 above. By comparison, it was found that the properties regarding treated film attachment and dry film attachment were even more improved.

Moreover, both Samples 18 and 19 according to the present invention had no adverse effect on photographic performance.

Agent Yoshimi Kuwahara 39- Procedural amendment] Matters A'I No. 1983 Patent Application No. 203358 2 Title of invention Photographic support 3 Relationship to the person making the amendment Patent applicant's address Tokyo 1-26-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo Name (+27) Konishiroku Photo Industry Co., Ltd. Representative Director Nobuhiko Kawamoto 4 Agent Address 1-5 Sakura-cho, Kono-shi, Tokyo 191 Date of amendment order Section 6, "Detailed Description of the Invention" column 7 of the specification to be amended, Contents of the amendment (1) "Dicarboxylic acid" in line 5 of the nodding page of the specification is corrected to "for example dicarboxylic acid".

(2) "Ethylacrylamide" in the bottom row of Table 5 on page 38 is corrected to "ethyl acrylate."

2 -

Claims (1)

[Scope of Claims] An aqueous composition containing a copolymer of monomers represented by the following general formula (I) having a minimum film formation temperature of 40°C or less is directly coated on at least one surface of a polyester support. 1. A photographic support comprising a subbing layer obtained by. General formula (I) 1C=CCOZCHtO& (In the formula, R1 represents a hydrogen atom or a methyl group, and R1 represents a straight chain or branched alkyl group having 1 to 8 carbon atoms.)