JPH0667344A - Photographic substrate - Google Patents

Abstract

PURPOSE:To provide a photographic substrate excellent in transparency, lubricity, restorability of curling tendency after development and mechanical strength. CONSTITUTION:This photographic substrate is made of a multilayered film obtd. by laminating a copolymerized polyester layer on at least one side of a polyester layer. The copolymerized polyester contains arom. dicarboxylic acid having a metal sulfonate group as a copolymerizable component by 2-7mol.% of all the ester bond units and further contains polyalkylene glycol as a copolymerizable component by 3-10wt.% of the amt. of the reactional product. The ratio of the thickness of the copolymerized polyester layer to that of the polyester layer is 0.7-3 and the thickness of the polyester layer is 50mum or smaller The center line average roughness of at least one side of the outermost layer is 0.0020-0.020mum and the haze of the entire film is 1.5% or less.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to a photographic support,
More specifically, it can be thinned while maintaining strength, has excellent curl recovery after development, has high transparency, and has excellent slipperiness, making it suitable for loading into small cameras. The present invention relates to a support for use.

[0002]

2. Description of the Related Art Small cameras are now commonly used in the general market. Considering the handiness of this compact camera so that it is convenient to carry, it is desired that the compact camera be made smaller than it is now. In order to further reduce the size of this small camera, it is indispensable to make the storage space of the built-in photographic film compact.

Since the photographic film is usually stored in a small camera in a roll wound on a spool, the storage space in the small camera can be made more compact and at the same time a certain number of images can be taken. , It is necessary to reduce the thickness of the photographic film itself. In particular, the thickness of the photographic film support is currently
It is about 120 to 125 μm, which is considerably thicker than the thickness (20 to 30 μm) of the photosensitive layer formed on the surface. Therefore, it is most effective to further reduce the thickness of the support of the photographic film in order to reduce the thickness of the entire photographic film.

A triacetyl cellulose (sometimes abbreviated as TAC) film is typical as a support for a photographic film that has been conventionally used. However, since this TAC film originally has low mechanical strength, if the TAC film is made thinner, the transportability and handleability in the photographing device and the subsequent development processing step will be deteriorated. Therefore, it is not a good idea to make the thickness of the TAC film thinner than the current one as a support for the photographic film.

On the other hand, it has been conventionally known to use polyethylene terephthalate (sometimes abbreviated as PET) for a support, and PET has been used for, for example, an X-ray film or a plate-making film. Further, since PET is excellent in strength, it may be considered to apply it to a support for a color negative film, but a polyethylene terephthalate support is excellent in strength, but it tends to have a curling tendency, There is a drawback that the curling habit can hardly be removed even after development processing.

[0006] For example, Japanese Patent Laid-Open No. 1-244446 discloses, as a method for improving the curl recovery of a PET film, a copolymer in which an aromatic dicarboxylic acid having a metal sulfonate group is used as a copolymerization component to impart hydrophilicity. PET films have been proposed. However, in this method, a large amount of copolymerization components must be contained in order to obtain sufficient curl recovery, and the properties such as excellent mechanical strength and dimensional stability inherent in PET are lost. Therefore, there is a drawback that the superiority to TAC is lost.

As a method for achieving both mechanical strength and curl recovery of the support, a method of laminating polyesters having different water contents is proposed in Japanese Patent Application No. 2-208804. Even in the method, in order to obtain sufficient curl recovery, a large amount of the copolymerization component must be contained, the mechanical strength of the copolyester layer itself decreases, and the mechanical strength of the entire support, especially the elastic modulus is reduced. There was no effect on the improvement of.

Further, Japanese Patent Application No. 3-277335 proposes a method for producing a copolyester film having excellent strength. The support obtained by this method has a high haze in the film, It was not a satisfactory support for.

Generally, a transparent film used for a photographic support is required to have contradictory properties such as transparency and slip property, which is a problem. That is, when the transparency of the support is pursued, the surface of the support becomes smooth, and the slipperiness of the surface of the support is significantly reduced. When the slipperiness of the support is lowered, there is a problem in so-called windability, that is, wrinkles are formed on the support after being wound in the winding step in the support manufacturing process. On the other hand, if an inorganic compound or the like is added to the support in order to impart slipperiness, the haze of the support will increase and the transparency will decrease.

[0010]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems relating to a support, and the object of the present invention is to have sufficient transparency as a photographic support and to have excellent slipperiness. Another object of the present invention is to provide a photographic support which is excellent in curl recovery after development and mechanical strength.

[0011]

The above object of the present invention comprises a multilayer film in which a copolyester layer is laminated on at least one side of a polyester layer, and the copolyester has a metal sulfonate group as a copolymer component. Containing 2 to 7 mol% of an aromatic dicarboxylic acid having a total amount of ester bond units, and further containing a polyalkylene glycol as a copolymerization component in an amount of 3 to 3 with respect to the total weight of the reaction product.
10% by weight, and the ratio of the total thickness d ₂ of the copolyester layer to the total thickness d ₁ of the polyester layer is
0.7 ≦ d ₂ / d ₁ ≦ 3, the thickness of one polyester layer is 50 μm or less, the center line average roughness of at least one surface of the outermost layer is 0.0020 μm or more and 0.020 μm or less, and the haze of the entire film is 1.5. Achieved by providing a photographic support characterized by less than or equal to%.

The present invention will be described in detail below.

The photographic support of the present invention is a multilayer film in which a copolyester layer is laminated on at least one side of the polyester layer. The support may be composed of any number of layers, but it is generally preferable that the number of layers is two or three because laminating too many layers complicates manufacturing equipment.

The thickness of each layer can be appropriately determined depending on the polyester and the copolyester used, but is preferably the ratio of the total thickness d ₂ of the copolyester layer to the total thickness d ₁ of the polyester layer (d ₂ / d ₁ )
Is 0.7 ≦ d ₂ / d ₁ ≦ 3, more preferably 1 ≦ d ₂ / d
₁ ≤ 2 and the thickness of one polyester layer is preferably
It is 50 μm or less, more preferably 40 μm or less.

The thickness of the photographic support of the present invention may be such that the necessary strength and the like can be obtained depending on the application, and for example, 30 to
It is preferably 200 μm, particularly 40 to 120 μm. If the thickness of the support is less than 30 μm, the required strength may not be obtained, and wrinkles may occur during winding in the manufacturing process. On the other hand, if the thickness of the support is thicker than 200 μm, it may lose its superiority to the conventional photographic support, but if necessary, it is possible to increase the number of layers to 4 layers or 5 layers to increase the thickness. is there.

The polyester used in the photographic support of the present invention is a polyester having an aromatic dibasic acid and glycol as main components, and the dibasic acid may be terephthalic acid, isophthalic acid or 2,6-naphthalenedicarboxylic acid. Examples of the glycol include ethylene glycol, propylene glycol, butanediol, neopentyl glycol, 1,4-cyclohexanedimethanol, diethylene glycol and p-xylylene glycol. Of these, polyethylene terephthalate containing terephthalic acid and ethylene glycol as main constituents is preferable.
Further, a copolymer containing 85 mol% or more of these main repeating units may be used as long as the original excellent properties of polyester are not impaired, or other polymers may be blended.

The copolyester used in the present invention is a copolyester having an aromatic dicarboxylic acid having a metal sulfonate group as a copolymerization component and an aromatic dibasic acid and glycol as main constituents. Examples of the dibasic acid include terephthalic acid, isophthalic acid, and 2,6-naphthalenedicarboxylic acid, and examples of the glycol include ethylene glycol, propylene glycol, butanediol, neopentyl glycol, 1,4-cyclohexanedimethanol, diethylene glycol, p- For example, xylylene glycol. Of these, copolymerized polyethylene terephthalate containing terephthalic acid and ethylene glycol as main constituents is preferable.

As the aromatic dicarboxylic acid having a metal sulfonate group, 5-sodium sulfoisophthalic acid,
Substitution of 2-sodium sulfoisophthalic acid, 4-sodium sulfoisophthalic acid, 4-sodium sulfo-2,6-naphthalenedicarboxylic acid or its ester-forming derivative, and these metals with other metals (eg potassium, lithium, etc.) The compound is used.

The copolymerization ratio of the aromatic dicarboxylic acid component having a metal sulfonate group is in the range of 2 to 7 mol%, preferably 3 to 6 mol% based on the total ester bond units.
Is. If it is less than 2 mol%, sufficient curl recovery cannot be obtained, and if it exceeds 7 mol%, the mechanical strength becomes poor, which is not preferable.

The copolymerized polyester used in the present invention further comprises polyalkylene glycol as a copolymerization component in an amount of 3 to 10% by weight, more preferably 4 to 9% by weight, based on the total weight of the reaction product. It is preferably contained in the range. If the content of the polyalkylene glycol is less than 3% by weight, sufficient curl recovery cannot be obtained, and if it exceeds 10% by weight, the mechanical strength becomes poor, which is not preferable.

Examples of the polyalkylene glycol include polyethylene glycol and polytetramethylene glycol. Among them, polyethylene glycol is preferable, and the molecular weight is 600 to 20000, particularly 1000 to 50.
00 is preferably used.

The copolymerized polyester used in the present invention may be further copolymerized with other components, or may be blended with other polymers, within a range that does not impair the effects of the present invention.

The copolyester used in the present invention is not particularly limited as to its production method, and for example,
After transesterifying the dicarboxylic acid component and the glycol component, by a method of polycondensation under high temperature and reduced pressure,
It is preferably manufactured.

Examples of the catalyst used for transesterification include acetates, fatty acid salts and carbonates of metals such as manganese, calcium, zinc and cobalt. In the present invention, of these, a manganese compound or a combination of a manganese compound and a calcium compound is preferable, and for example, manganese acetate or calcium acetate hydrate is preferable, and a mixture thereof is preferable.

The preferred amount of the catalyst used, the manganese ^{compound, 0.5 × 10 -2 ~11.0 × 10} - a ² (mol% / acid component), the calcium compound, 0.5 × 10 ^-2
It is about 5.0 × 10 ^-2 (mol% / acid component). In the present invention, manganese compound 0.5 × 10 ^{-2 to} 11.0 × 10 ^-2 mol% / acid component and calcium compound 0.5 × 10 ^-2 to 5.0 × 10 ^-2 mol%
/ It is preferable to polymerize in combination with an acid component. If the amount used as a catalyst is less than this range, the transesterification reaction does not proceed sufficiently, which is not preferable. On the other hand, if the amount of the catalyst used is more than this range, the haze of the obtained polyester becomes large, which is not preferable.

The copolyester used in the present invention may contain phosphoric acid, phosphorous acid, and their esters and inert inorganic particles, which are mixed in at the polymerization stage, or are added after the polymerization. It may contain inert inorganic particles.

The inert inorganic particles are not particularly limited as long as they do not impair the transparency of the photographic support.
For example, silica, kaolin, calcium carbonate, calcium phosphate, titanium dioxide and the like can be preferably used. When a copolyester is produced by using a manganese compound as a transesterification catalyst, an inert inorganic particle having an average particle size of 0.05 to 0.5 μm, preferably 0.08 to 0.4 μm, is produced during the polymerization. The particles are preferably added to the polymerization system in a proportion of 0.01 to 2.0% by weight, preferably 0.03 to 1.8% by weight, based on the obtained copolyester.

If the average particle size of the inert inorganic particles exceeds 0.5 μm, the transparency of the photographic support may decrease, and if it is less than 0.05 μm, the effect of slipperiness may not be sufficiently exhibited. There is. In addition, the content of inert inorganic particles is 2.0
If the content is more than 10% by weight, the transparency of the support may be reduced, and if the content of the inert inorganic particles is less than 0.01% by weight, the workability may be deteriorated due to insufficient slidability. .

The copolyester layer constituting the photographic support of the present invention can be produced from only the above-mentioned copolyester according to the method described below, and is usually within the range not impairing the object of the present invention. Other additives used, such as matting agents, antistatic agents, surfactants, stabilizers, dispersants, plasticizers, UV absorbers, electrically conductive substances, tackifiers, softeners, fluidity enhancers, enhancers. Sticky agent, antioxidant,
It may contain a dye or the like. These may be added at the polymerization stage for producing the copolyester, or may be blended with the produced copolyester. Further, phosphoric acid, phosphorous acid and their esters may be contained in the polymerization stage.

The photographic support of the present invention comprises a multilayer film in which a copolyester layer is laminated on at least one side of a polyester layer as described above, and the haze of the entire film is 1.5% or less, and at least the outermost layer. The center line average roughness of one surface is 0.0020 μm or more and 0.020 μm or less.

When the haze of the support is more than 1.5%, the transparency is poor and it is not preferable as a photographic support.

The haze of the photographic support is, for example, the use of a manganese compound in the transesterification catalyst, or
It can be adjusted to 1.5% or less by reducing the amount of the inert inorganic particles added or by using particles having a particle diameter within the above-mentioned specific range.

The center line average roughness of the photographic support of the present invention is 0.0020 μm or more, preferably 0.0025 μm or more. When the center line average roughness is less than 0.0020 μm, the slipperiness is deteriorated, and for example, when a photographic support thinned to 100 μm or less is wound in a manufacturing process, wrinkles may be formed on the photographic support, which is not preferable. If the center line average roughness exceeds 0.020 μm, it will vary depending on the composition of the polyester used, the catalyst, the type of additive, and the particle size.
The haze of the support may exceed 1.5%, which is not preferable. In the present invention, the center line average roughness is 0.010 μm.
The following is particularly preferable.

The center line average roughness of the photographic support of the present invention can be adjusted to a value within the above-mentioned specific range by adjusting the particle size of the inert inorganic particles added during the polymerization. Then, it can be realized by adjusting the particle size of the inert inorganic particles blended with the obtained copolyester. Further, in order to make the center line average roughness of the photographic support within the specific range regardless of the particle size of the inert inorganic particles to be added, it is realized by adjusting the addition amount of the inert inorganic particles. be able to. Of course, in the present invention, the method of keeping the center line average roughness of the photographic support within the specific range is not limited to the above method, and any other method can be adopted.

As the method for producing the photographic support of the present invention, for example, polyester and copolyester are melt-extruded from separate extruders and then joined in a laminar flow state in a conduit of the melted polymer or in an extrusion die. There is a coextrusion method in which a non-stretched film is obtained, then biaxially stretched and heat set. Further, the polyester is melt-extruded from an extruder, the unstretched film cooled and solidified on a cooling drum or the surface of a uniaxially oriented film uniaxially stretched on the unstretched film is coated with an anchoring agent, an adhesive, etc., if necessary. There is an extrusion laminating method in which a copolyester is extrusion laminated on top, and then biaxial stretching is completed and then heat setting is performed. The coextrusion method is preferable from the viewpoint of process simplicity.

There are no particular restrictions on the stretching conditions of the film, but it is generally preferable to appropriately adjust the conditions for the polyester layer, and the glass transition temperature (T
It is preferable that the stretching is performed in the biaxial direction at a stretching ratio of 2.5 to 6.0 times in the temperature range of g) to Tg + 100 ° C. The heat setting can be performed in the temperature range of 150 ° C to 240 ° C.

The photographic support of the present invention can be applied to various currently known uses, and is particularly useful as a photographic support used for roll-shaped films.

The photographic support of the present invention can be applied as a silver halide photographic light-sensitive material by having at least one silver halide emulsion layer on at least one side. The silver halide emulsion layer may be directly coated on the support, or may be coated via another layer such as a hydrophilic colloid layer containing no silver halide emulsion.

At this time, various surface treatments such as corona discharge treatment and chemical treatment can be applied to the photographic support for improving adhesiveness, if necessary. To further improve adhesion,
An undercoat layer may be provided by coating.

The silver halide constituting the silver halide emulsion layer used in the present invention may have any composition. Examples are silver chloride, silver chlorobromide, silver chloroiodobromide, pure silver bromide and silver iodobromide.

A sensitizing dye, a plasticizer, an antistatic agent, a surfactant, a hardener and the like can be added to the above silver halide photographic light-sensitive material.

To develop a silver halide photographic light-sensitive material, for example, the method described in T. H. The Theo of the Photographic Process 4th Edition by James (The Theo
ry of the Photographic Process, Fourth Edition)
Pages 291 to 334 and Journal of the American
Chemical Society (Journal of the American Chem
ical Society) Vol. 73, page 3,100 (1951).

[0043]

【Example】

Example 1 100 parts by weight of dimethyl terephthalate, ethylene glycol
To 64 parts by weight, 0.02 part by weight of calcium acetate hydrate and 0.025 part by weight of manganese acetate hydrate were added, and transesterification reaction was carried out by a conventional method. 28 parts by weight of ethylene glycol solution of 5-sodium sulfodi (β-hydroxyethyl) isophthalic acid (concentration 35% by weight) (5 mol% / total acid component), polyethylene glycol (number average molecular weight 3000) 8.1 parts by weight (7% by weight / polymer), antimony trioxide 0.05 parts by weight, phosphoric acid trimethyl ester 0.13
Parts by weight were added. Then gradually raise the temperature and reduce the pressure,
Polymerization was carried out at 0.5 ° C. and 0.5 mmHg to obtain a copolyester.

Each of the copolyester and the commercially available polyethylene terephthalate (intrinsic viscosity 0.65) was vacuum dried at 150 ° C. and melt-extruded at 285 ° C. by using three extruders. To form a laminated unstretched film. At this time, the extrusion amount of each material was adjusted and the thickness of each layer was changed as shown in Table 1. Then 85 ℃
And draw it 3.5 times in the vertical direction, and then draw it 3.5 times in the horizontal direction at 95 ° C.
After being double-stretched, it was heat set at 210 ° C. to obtain a biaxially stretched film having a thickness of 80 μm. However, the layer structure of the film, the thickness of each layer, the haze of the film, and the center line average roughness are as shown in Table 1. The haze of the film and the center line average roughness of the surface were measured by the following methods.

For each of the obtained samples, curl and roll recovery,
The winding property and elastic modulus were evaluated by the following methods.
The results are shown in Table 1.

Film measuring method and evaluation method <Transparency> The haze of the film was measured according to JIS K-6714. Practically 1.5% or less is preferable as a photographic support.

<Center Line Average Roughness> The surface of the film support is covered with a non-contact surface roughness meter TOPO-3D manufactured by WYKO.
The surface roughness of 250 μm square was measured with a 40 × objective lens. However, a portion of the measurement length L is extracted from the extraction curve in the direction of the center line, the center line of the extraction portion is the X axis, and the vertical magnification direction is the Z axis, and the extraction curve is Z = f.
When represented by (X), it was calculated by the following formula.

[0048]

[Equation 1] If the center line average roughness is less than 0.0020 μm, handling may be hindered.

<Winding curse recovery property> Sample size 12 cm x 35
mm film wound on a core with a diameter of 10 mm, 55 ℃, 20% RH
It is processed for 3 days under the conditions of, and the curl is attached. After that, it is released from the core, immersed in pure water at 38 ° C. for 15 minutes, and then dried with a hot air dryer at 55 ° C. for 3 minutes while applying a load of 50 g. The load was removed, the sample was suspended vertically, the distance between both ends of the sample was determined, and it was evaluated how much the original distance was restored to 12 cm. If the curl recovery is less than 40%, handling may be hindered.

<Winding property> Whether or not wrinkles were formed on the film support when the film support was wound in the manufacturing process was visually evaluated according to the following criteria. ◯: No wrinkles at all Δ: Wrinkles may be partially present ×: Wrinkles are present As a photographic support, a Δ level or higher is preferable for practical use.

<Elastic Modulus> Film is at a temperature of 23 ° C. and relative humidity
After leaving it in a room controlled to 55% for 4 hours or more,
It was obtained by cutting to a length of 10 mm and a length of 200 mm, setting a chuck distance of 100 mm, and performing a tensile test at a tensile speed of 100 mm / min. Modulus of elasticity is 4
If it is less than 00 kg / mm ² , handling may be hindered.

[0052]

[Table 1] As is clear from Table 1, a film made of a single material of copolyester and a film of polyester each having a center line average roughness other than that of the present invention had a winding recovery rate, an elastic modulus, a winding property, or a haze. Although the properties are inferior, those in which both the copolyester and the polyester are laminated, particularly those in which the ratio of each layer is adjusted to the value specified in the present invention, are good in both winding recovery rate, elastic modulus, winding property and haze. Was obtained.

Example 2 Ethylene glycol solution of 5-sodium sulfodi (β-hydroxyethyl) isophthalic acid (concentration 35% by weight),
The addition amount of polyethylene glycol (number average molecular weight 3000) was changed as shown in Table 2, and the ratio of the thickness of each layer was changed to Sample No.
A biaxially stretched film having a thickness of 80 μm was obtained in the same manner as in Example 1 except that the same procedure as in Example 1 was performed. However, the haze and center line average roughness of the film are as shown in Table 2. The same evaluation as in Example 1 was performed on each sample. The results are shown in Table 2.

[0054]

[Table 2] As is clear from Table 2, the samples of the present invention have curl recovery properties,
It was found that satisfactory values were obtained for all of the elastic modulus and the winding property.

Example 3 Sample N of Example 1 except that the amount of transesterification catalyst used in Sample No. 1 of Example 1 was changed as shown in Table 3.
A biaxially stretched film having a thickness of 80 μm was obtained in the same manner as in o.1. However, haze and center line average roughness of the film are as shown in Table 3. The winding property of each sample was evaluated in the same manner as in Example 1. The results are shown in Table 3.

[0056]

[Table 3] As is clear from Table 3, it was found that the sample having the transesterification catalyst in the range of the above-specified value had a satisfactory winding property.

Example 4 In the sample No. 1 of Example 1, the transesterification catalyst was replaced with manganese acetate hydrate (the addition amount is shown in Table 4), and Table 4 was used.
In the same manner as in Sample No. 1 of Example 1 except that silica having a particle size as shown in Table 4 was added as shown in Table 4.
An 80 μm biaxially stretched film was obtained. However, the haze and center line average roughness of the film are as shown in Table 4. The winding property of each sample was evaluated in the same manner as in Example 1. The results are shown in Table 4.

[0058]

[Table 4] As is clear from Table 4, the amount of Mn compound used is 0.5 × 10
^{-2 to} 11.0 × 10 ^-2 mol% / acid component, silica particle size is 0.05
It was found that a sample having a particle size of ˜0.5 μm and an amount of silica of 0.01 to 2.0% by weight / polymer gives a satisfactory winding property.

[0059]

As described in detail above, according to the present invention, it is possible to obtain a photographic support excellent in transparency, slipperiness, curl recovery after development and mechanical strength.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hideyuki Kobayashi 1 Sakura-cho, Hino-shi, Tokyo Konica stock company (72) Inventor Hiromitsu Araki 1 Sakura-cho, Hino-shi, Tokyo Konica stock company (72) Inventor Yoshioki Okubo 2-33-5 Soja-machi, Hofu-shi, Yamaguchi Prefecture (72) Inventor Tetsutaro Hashimura 1751-15 Nitta, Hofu-shi, Yamaguchi Prefecture (72) Inventor Hiroshi Naito 2265-5 Yoshikashi, Yamaguchi City, Yamaguchi Prefecture

Claims (5)

[Claims] 1. A multilayer film comprising a polyester layer and a copolyester layer laminated on at least one side of the polyester layer, wherein the copolyester comprises an aromatic dicarboxylic acid having a metal sulfonate group as a copolymer component in all ester bond units. Content of 2 to 7 mol% and polyalkylene glycol as a copolymerization component in an amount of 3 to 10% by weight based on the total weight of the reaction product, and the copolymerization is based on the total thickness d ₁ of the polyester layer. The ratio of the total thickness d ₂ of the polyester layers is 0.7 ≦ d ₂ / d ₁ ≦ 3, the thickness of one polyester layer is 50 μm or less, and the center line average roughness of at least one surface of the outermost layer is 0.0020 μm. A photographic support characterized in that the haze of the entire film is 0.020 μm or less and the haze of the entire film is 1.5% or less. _2. The ratio of the total thickness d ₂ of the copolyester layer to the total thickness d ₁ of the polyester layer is 1 ≦ d.
₂ / d ₁ ≦ 2, the thickness of one polyester layer is 40μ
3. The photographic support according to claim 1, wherein the photographic support is m or less. 3. The copolyester according to claim 1, 2 or 3, wherein the Mn compound is 0.5 × as a transesterification catalyst.
10 ^{-2 to} 11.0 x 10 ^-2 (mol% / acid component) is used, and inactive inorganic particles with an average particle size of 0.05 to 0.5 μm are used in a ratio of 0.01 to 2.0% by weight based on the copolyester. 4. The photographic support according to claim 1, wherein the photographic support is obtained by 4. The copolyester according to claim 1, 2 or 3, wherein the Mn compound is 0.5 × as a transesterification catalyst.
10 ^-2 ~11.0 × 10 ^-2 (mol% / acid component), and a Ca compound obtained by polymerizing a combination of ^{0.5 × 10 -2 ~ 5.0 × 10} -2 ( mol% / acid component) The photographic support according to claim 1, 2 or 3, wherein 5. The photographic support according to claim 1, 2, 3, 4, or 5, wherein the polyester forming the polyester layer is polyethylene terephthalate.