JPH08334865A - Undercoat film for photographic film - Google Patents

Abstract

PURPOSE: To obtain an undercoat film excellent in antistatic performance, causing little change of surface energy and excellent in adhesiveness to a photographic layer of a photosensitive agent by using a gelatin layer having a specified compsn. CONSTITUTION: A gelatin layer contg. 3-60wt.% copolymer contg. 60-98mol% constituent units (a) represented by formula I, 0-25mol% constituent unit (b) represented by formula II and 2-15mol% constituent units (c) represented by formula III is laminated on at least one side of a polyester film. In the formula II, each of R<1> and R<2> is H or CH3 and X is 1-6C satd. hydrocarbon. In the formula III, each of R<1> and R<2> is H or CH3 , R<3> is 2-10C alkylene, each of R<4> -R<6> is H or 1-5C satd. hydrocarbon and Y is halogen ion, etc. The units (a) are units obtained using ethylene as a monomer and the units (b) are units obtained using methyl methacrylate, etc., as a monomer and is represented by formula (III).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an undercoat film for photographic film, and more specifically to a polyester film,
The present invention relates to an undercoat film for a photographic film, which has a gelatin layer having excellent antistatic property and excellent adhesiveness with a photographic photosensitive layer.

[0002]

2. Description of the Related Art Polyester films, particularly polyester films using polyethylene terephthalate or polyethylene naphthalate, are widely used for photographic materials such as undercoat films for photographic films.

However, such a polyester film has a drawback that it is easily charged with electricity and dust and dirt are easily attached to the surface of the film due to the charging.

In order to improve such defects due to electrification, a method of applying an antistatic coating film containing a low molecular weight antistatic agent or a high molecular weight antistatic agent on the surface of a polyester film has been proposed and put into practical use. .

As the low molecular type antistatic agent, for example, a surfactant type anionic antistatic agent such as a long chain alkyl compound having a sulfonate group (Japanese Patent Laid-Open No. 28728/1992) is known. In addition, as a polymer type antistatic agent, a polymer having an ionized nitrogen element in its main chain (Japanese Patent Application Laid-Open No. 3-255139, Japanese Patent Application Laid-Open No. 4-255139)
-288127, JP-A-6-172562) and sulfonate-modified polystyrene (JP-A-5-3).
No. 20390) is known.

However, in the antistatic coating film using such a low molecular type antistatic agent, the antistatic agent moves in the coating film and accumulates on the surface, and is transferred to the adjacent film surface (back surface transfer). Therefore, there is a problem that the surface energy of the film transfer surface changes, which adversely affects the adhesiveness when laminating various coating films, and the antistatic property deteriorates with time.
On the other hand, in the antistatic coating film using a polymer type antistatic agent,
In a low humidity state, the antistatic effect is likely to decrease, so it is necessary to add a large amount of antistatic agent, and since it is necessary to form a thick antistatic coating film, it is not economical, and However, there is a problem that the adhesiveness when laminating the photographic photosensitive layer is insufficient.

[0007]

The object of the present invention is to solve the problems of the prior art, to have excellent antistatic property, to have little change in surface energy, and to have excellent adhesiveness with a photographic photosensitive layer. An object of the present invention is to provide an undercoat film for a photographic film having a gelatin layer laminated thereon.

[0008]

The object of the present invention is to provide, according to the present invention, a structural unit (i) 60-having a structural unit (i) represented by the following formula (I) on at least one surface of a polyester film (E layer).
98 mol%, structural unit (ii) 0 represented by the following formula (II)
To 25 mol% and a structural unit represented by the following formula (III) (ii
i) It is achieved by an undercoat film for a photographic film in which a gelatin layer (Z layer) containing 2 to 15 mol% of the copolymer (A) in an amount of 3 to 60% by weight is laminated.

[0009]

[Chemical 4]

[0010]

Embedded image

[In the formula (II), R ¹ and R ² are H or C
H ₃ ; X represents a saturated hydrocarbon group having 1 to 6 carbon atoms. ]

[0012]

[Chemical 6]

[In the formula (III), R ¹ and R ² are H or CH.
₃ ; R ³ is an alkylene group having 2 to 10 carbon atoms; R ⁴ ,
R ⁵ and R ⁶ are H or a saturated hydrocarbon group having 1 to 5 carbon atoms; Y is a halogen ion, an alkyl sulfate ion, an alkyl sulfonate ion or a nitrate ion. The present invention will be described in detail below.

[Polyester Film] In the present invention, the polyester constituting the polyester film (E layer) is a linear polyester comprising a dicarboxylic acid component and a glycol component.

Examples of the dicarboxylic acid component include terephthalic acid, isophthalic acid, 2,6-naphthalenedicarboxylic acid, hexahydroterephthalic acid, 4,4'-diphenyldicarboxylic acid, adipic acid, sebacic acid and dodecanedicarboxylic acid. Among them, terephthalic acid and 2,6-naphthalenedicarboxylic acid are particularly preferable.

As the glycol component, for example, ethylene glycol, diethylene glycol, propylene glycol, 1,3-propanediol, 1,4-butanediol, neopentyl glycol, 1,6-hexanediol, cyclohexanedimethanol, polyethylene glycol. , Polytetramethylene glycol and the like, and ethylene glycol is particularly preferable.

The above-mentioned polyester may be a polyester obtained by copolymerizing the above-mentioned dicarboxylic acid component or glycol component in order to improve the adhesion between the polyester film and the gelatin layer (Z layer). Further, a polyester obtained by copolymerizing a trifunctional or higher polyvalent compound in a small amount within a range in which the polyester is substantially linear (for example, 5 mol% or less) may be used.

Among such polyesters, polyethylene terephthalate or polyethylene-2,6-naphthalate copolymer containing a homopolymer of polyethylene terephthalate or polyethylene-2,6-naphthalate in a proportion of 30 mol% or less is high. It is preferable because a film having excellent mechanical properties such as Young's modulus and excellent thermal properties such as good heat resistance dimensional stability can be obtained.

The polyester can be prepared by a conventional method. Also, the intrinsic viscosity of polyester is 0.45
The above is preferable because mechanical properties such as high rigidity of the film are improved.

The above polyester has an average particle size of 0.1 as a lubricant in order to improve the slipperiness of the film.
An organic or inorganic fine particle having a particle size of about 0.
It is preferable to contain it in a blending ratio of 001 to 1% by weight. Specific examples of such fine particles include calcium carbonate, calcium oxide, amylnium oxide, titanium oxide, graphite, kaolin, silica, alumina, silicon oxide, zinc oxide, carbon black, silicon carbide, tin oxide, acrylic resin particles, crosslinked polystyrene resin particles. Preferable examples include melamine resin particles and silicone resin particles.

In addition to the fine particles, a colorant, an antistatic agent,
Antioxidants, organic lubricants, catalysts, optical brighteners, plasticizers, cross-linking agents, slip agents, UV absorbers, other resins and the like can be added as required. The copolymer (A) can also be used as the antistatic agent.

The thickness of the polyester film after stretching is preferably 20 to 500 μm, and particularly preferably 50 to 200 μm. The light transmittance of the polyester film is preferably 80% or more.

The polyester film used in the present invention is
It can be manufactured by a conventionally known method. For example, it can be produced by melting the polyester and casting it on a cooling drum to obtain an unstretched film, and then stretching the unstretched film in the machine direction and then in the transverse direction. Further, it can be stretched again in the machine direction and / or the transverse direction. The stretching treatment is performed by the second-order transition point (T
g) It is preferable to carry out stretching at a temperature higher than 2) in each direction by a factor of 2 or more, more preferably 3 or more. At that time, the area stretching ratio is preferably 8 times or more, and more preferably 9 times or more. The upper limit of the area stretching ratio is 35 times, and further 30
It is preferably doubled. The oriented crystallization can be completed by heat treatment after stretching.

[Gelatin] In the present invention, a gelatin layer (Z layer) containing the copolymer (A) is laminated on at least one side of a polyester film.
It can be obtained from collagen in the dermis of porcine, sheep, whale, etc., or ossein in bone. To obtain gelatin from the dermis, for example, the dermis is lime-pickled, dehaired, and then lime-pickled,
It can be obtained through the steps of washing with water, neutralization with acid, washing with water, extraction, coagulation, cutting and drying. In order to obtain gelatin from bone, for example, the calcium phosphate component can be removed with hydrochloric acid to remove ossein, and thereafter the same can be obtained as in the case of dermis.

[Copolymer (A)] The copolymer (A) to be blended in the gelatin layer is 60 to 98 mol% of the structural unit (i) represented by the above formula (I) and represented by the above formula (II). A structural unit (ii) of 0 to 25 mol% and a structural unit (iii) of the formula (III) of 2 to 15 mol%, wherein the structural unit (i) is 80 to 95 mol% Unit (ii) is 2
It is preferable that the content of 15 mol% and the content of the structural unit (iii) be 5 to 10 mol% because the film has more excellent antistatic property and heat resistance.

The structural unit (i) is a unit obtained by using ethylene as a monomer, and the structural unit (ii) is, for example, a monomer such as methyl methacrylate, ethyl methacrylate, ethyl acrylate or methyl acrylate. A unit obtained by using an acrylic acid-based monomer such as butyl acrylate, methyl methacrylate, and ethyl methacrylate.

The structural unit (iii) is represented by the above formula (III).
R in formula (III)³Of
As an example, a propylene group (-(CH₂)₃-),
Ren group (-(CH₂)_Four-) And other alkylene groups
Can, R^Four, R^Five, R ⁶As a preferred example of
Methyl group (CH₃-), Ethyl group (C₂H_Five-) Etc.
A rukyi group can be mentioned. Also, preferred examples of Y
Are halogen ions such as Cl, Br, F and I, and C
H₃OSO₃, C₂H_FiveOSO₃Alkylsulfe such as
Toon, CH₃SO₃, C₂H_FiveSO₃Archi etc.
Rusulfonate ion, NO₃Nitrate ion such as
Can be mentioned.

Specific examples of the structural unit (iii) include the following formulas (III-1) and (III-2).

[0029]

[Chemical 7]

[0030]

Embedded image

The average molecular weight of the copolymer (A) is 2,0.
It is preferably from 00 to 50,000. If the average molecular weight is less than 2,000, the heat resistance of the film may be insufficient, and if it exceeds 50,000, dispersibility or solubility in the aqueous coating liquid may be poor.

[Gelatin layer (Z layer)] In the present invention, a gelatin layer (Z layer) containing 3 to 60% by weight of the copolymer (A) is laminated on at least one side of the polyester film. If the proportion of A) is less than 3% by weight, the antistatic property is insufficient, and if it exceeds 60% by weight, the adhesion of the gelatin layer to the photographic photosensitive layer and the water resistance of the gelatin layer are poor.

The gelatin layer may contain a binder resin in addition to the copolymer (A). Examples of the binder resin include copolymer polyester resin, acrylic resin, acrylic modified polyester resin, polyurethane resin, polyamide resin, polyether resin, epoxy resin, cellulosic resin, vinyl resin, polyvinyl alcohol, polyvinylpyrrolidone, and polyethyleneimine. Can be used.

Further, in the gelatin layer, in addition to the above components, a filler, a surfactant, an antioxidant, a colorant, a pigment, a fluorescent whitening agent, a plasticizer, a cross-linking agent, a slip agent, an ultraviolet absorber, a copolymer ( Antistatic agents other than A) can be added.

[Coating of Gelatin Layer] In the present invention,
The gelatin layer is laminated on at least one surface of the polyester film.The method for laminating is, for example, applying a coating solution such as an aqueous coating solution or an organic solvent solution containing the constituents of the gelatin layer to the surface of the polyester film and then heating. Then, a method of coating by drying or removing the solvent can be mentioned. The coating liquid is usually used at a concentration of 1 to 40% by weight, but particularly preferably 2 to 20% by weight.

For coating the coating liquid, for example, a gravure coater, a reverse roll coater, a die coater or the like can be used. The thickness of the applied gelatin layer is 0.01-
10 μm, particularly 0.015 to 5 μm is preferable. When the thickness is less than 0.01 μm, antistatic property and adhesiveness are insufficient, and 1
If it exceeds 0 μm, the transparency may decrease.

An unstretched film, a uniaxially stretched film or a biaxially stretched film can be used as the polyester film to which the coating liquid is applied. When an aqueous coating liquid is used as the coating liquid, the aqueous coating liquid is used as the uniaxially stretched film. It is preferable that the gelatin layer is dried and then biaxially stretched, because the gelatin layer has good abrasion resistance and can be coated efficiently. For example, polyester is heat-melted by an extruder, extruded into a sheet and cooled to obtain an unstretched film, and the unstretched film is stretched 2 to 8 times in the machine direction to form a uniaxially stretched film. Coating, heat-drying, then stretching in the transverse direction by 2 to 9 times, and if necessary, re-stretching in the longitudinal direction and / or transverse direction and / or heat treatment to form a laminated film with good abrasion resistance of the gelatin layer. You can

When an organic solvent solution is used as the coating liquid,
It is preferably applied to a biaxially stretched polyester film.

[Primer coating layer (P layer)] In the present invention, a primer coating layer (P layer) is provided on at least one surface of a polyester film (E layer), and a gelatin layer (on the primer coating layer). Z layer) can be laminated.

As the resin constituting the primer layer (P layer), a copolymer polyester resin, an acrylic resin,
Examples thereof include acrylic modified polyester resin, polyurethane resin, polyamide resin, polyether resin, epoxy resin, cellulosic resin and vinyl resin.

This copolyester resin is a linear polyester composed of a dicarboxylic acid component and a glycol component, and examples of the dicarboxylic acid component include terephthalic acid, isophthalic acid, naphthalenedicarboxylic acid, 4,4-diphenyldicarboxylic acid and adipic acid. , Sebacic acid, dodecanedicarboxylic acid, hexahydroterephthalic acid, phenylindanedicarboxylic acid, 5-Ksulfoisophthalic acid and the like. Examples of the glycol component include ethylene glycol, diethylene glycol, propylene glycol, 1,3-propanediol, 1,4-
Examples include butanediol, neopentyl glycol, 1,6-hexanediol, dipropylene glycol, triethylene glycol, bisphenol A-alkylene oxide adduct, hydrogenated bisphenol A-alkylene oxide adduct, and polyerylene glycol. .

The acrylic resin is a copolymer obtained by copolymerizing acrylic monomers. The acrylic monomer is, for example, methyl methacrylate, ethyl methacrylate, ethyl acrylate, methyl acrylate, butyl acrylate, acrylonitrile, acrylic acid, acrylamide, N-methylol acrylamide, glycidyl methacrylate, 2-hydroxyethyl acrylate. Etc.
In addition to the above, unsaturated monomers such as vinyl acetate, vinyl chloride and styrene can be used in the acrylic resin as a copolymerization component, and a crosslinkable component can also be used.

The acrylic modified polyester resin is a resin in which a polyester chain and an acrylic polymer chain are bonded, and can be obtained by copolymerizing the acrylic monomer in the presence of the copolymer polyester resin.

The polyurethane resin is made of polyether or polyester, polyisocyanate, chain extender, hydrophilic group-containing monomer and the like.

In addition, commonly known resins such as polyamide resin, polyether resin, epoxy resin, cellulose resin and vinyl resin can be used. These resins can be used alone or in combination. Furthermore, P
Inorganic fine particles such as silica, alumina, titanium oxide, carbon, etc. as a lubricant, crosslinked polystyrene resin, crosslinked acrylic resin, melamine resin, silicone resin, fluororesin, urea resin, benzoguanamine resin, etc. You can also

In the P layer, in addition to the above components, a surfactant, an antioxidant, a colorant, a pigment, an optical brightening agent, a plasticizer, a crosslinking agent,
A slip agent, an ultraviolet absorber, an antistatic agent and the like can be added. The copolymer (A) can also be used as the antistatic agent.

As a method for laminating the P layer on the surface of the polyester film, for example, a coating liquid such as an aqueous coating solution or an organic solvent solution containing the constituents of the P layer is applied to the surface of the polyester film and then heated. Examples thereof include a method of drying or removing a solvent and coating.

The coating liquid is usually used in a concentration of 1 to 30% by weight, but a concentration of 2 to 20% by weight is particularly preferable. The coating liquid may be a solvent-based solution or an aqueous coating liquid, but when the coating is performed in the film forming process of the polyester film, it is preferable to use the aqueous coating liquid. When the aqueous coating solution is applied to the polyester film, for example, at least one surface of the film uniaxially stretched in the longitudinal direction, the aqueous coating solution is applied by a gravure coater, a reverse roll coater, a die coater, etc., and then dried, and then the transverse direction. It is preferable to apply the film by stretching it so that the P layer has good abrasion resistance and can be applied efficiently. The coating amount of the aqueous coating liquid is 1 to 20 g / m ^{2 by} WET, especially 2 to
12 g / m ² is preferred. The thickness of this P layer is 0.01-
1 μm, particularly 0.015 to 0.4 μm is preferable.

[Undercoat film for photographic film] The undercoat film for a photographic film of the present invention has a two-layer structure of polyester film (E layer) / gelatin layer (Z layer) or gelatin layer (Z layer) / polyester. Film (E
Layer) / gelatin layer (Z layer), but when a primer coating layer (P layer) is laminated, E layer / P layer / Z
3-layer structure of layers, 4-layer structure of Z layer / P layer / E layer / Z layer, Z
A five-layer structure of layer / P layer / E layer / P layer / Z layer can be mentioned.

[0050]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples. Each characteristic value was measured by the following method. The average molecular weight in the examples means the number average molecular weight.

1. Surface resistivity (antistatic property) The surface resistivity of the gelatin layer (Z layer) of the film is set to 23.
The measurement was performed using a vibration capacitance type potentiometer (TR-84M type, manufactured by Takeda Riken Co., Ltd.) under the conditions of ° C and 42% RH.
When the surface resistivity is in the range of 1 × 10 ⁹ to 1 × 10 ¹² Ω, the film has excellent antistatic property.

2. Adhesiveness (a) Preparation of photosensitive emulsion 1N ammonium bromide solution (10 ml), 1N potassium iodide (0.5 ml), gelatin (6 g) and water (40 ml) were mixed, and the mixture was kept at 40 to 50 ° C. with stirring to give 1N ammoniacal property. 10 ml of silver nitrate solution was added dropwise over 2 minutes to prepare a photosensitive emulsion.

(B) Evaluation of Adhesiveness The surface of the gelatin layer (Z layer) of the sample film was coated with the photosensitive emulsion prepared in the above (a) and dried to 3 μm.
Was formed into a photosensitive film. The sample on which this photosensitive film was formed was immersed in an aqueous sodium hydroxide solution of PH11 32
It was dipped at 2 ° C. for 2 minutes, then dipped in a pH 4.2 acetic acid aqueous solution (containing 1% sodium acetate) at 32 ° C. for 2 minutes, further washed with water, and then air dried for 1 day. Cellophane tape was attached to the surface of the photosensitive film of this air-dried sample and brought into close contact with it with a hand roll, and then the state of peeling when the cellophane tape was peeled off at a speed of 300 mm / min was observed and the adhesiveness was evaluated according to the following criteria. A: Peeling off between the adhesive surface of the cellophane tape and the surface of the photosensitive coating (adhesiveness is good) B: The Z layer is partially cohesively broken, and Z is formed on the adhesive surface of the cellophane tape
Peeling off with part of the layer attached (slightly good adhesion) C: Peeling between the Z layer and E layer with the entire Z layer attached to the cellophane tape, or Z layer and P with the entire Z layer attached to the cellophane tape Peeling between layers (adhesion is poor)

3. Surface Energy (Surface Energy Stability) The degree of bleeding of the antistatic agent on the coating film surface was evaluated by the surface energy stability. That is, the surface energy is E ⁰
One side of a dyne / cm blank film (polyester film without coating) and the coating side of the sample film are overlaid and a load of 5 kg / cm ² is applied.
Hold for 18 hours in an atmosphere of 70 ° C and 70% RH, then peel off
The surface energy (E ¹ dyne / cm 2) of the contact surface of the blank film with the sample film was measured, and the surface energy stability was evaluated according to the following criteria from the obtained measurement results. A: E ¹ / E ⁰ ≧ 0.950 (good surface energy stability) B: 0.950> E ¹ / E ⁰ ≧ 0.925 (somewhat good surface energy stability) C: 0.925> E ¹ / E ⁰ (poor surface energy stability) The surface energy is JIS-K6768-1977.
It was determined by the method of measuring the wetting index in accordance with the wetting test method.

Example 1 Polyethylene-2,6-naphthalene dicalcylate (E-1) having an intrinsic viscosity of 0.65
Was melted and cast on a cooling drum to obtain an unstretched film, and this unstretched film was heated to 118 ° C. and stretched 3.3 times in the machine direction to obtain a uniaxially stretched film. Then, terephthalic acid (54 mol%), isophthalic acid (39 mol%) and 5-
K Sulfoisophthalic acid (7 mol%), ethylene glycol (58 mol%) as a glycol component, neopentyl glycol (25 mol%) and diethylene glycol (17 mol%) obtained by using a copolyester (average molecular weight: 17 , 500) 45% by weight, methyl methacrylate component 71 mol%, glycidyl methacrylate component 4 mol%, ethyl acrylate component 12 mol%, 2-hydroxyethyl acrylate component 8 mol% and N-methylolacrylamide component 5 mol% Copolymer (average molecular weight: 76,000) 36% by weight, polyethyleneimine (average molecular weight: 8,700) 7% by weight, and ethylene oxide / propylene oxide copolymer (average molecular weight:
7,250) 12% by weight of a composition of 4% by weight aqueous coating solution was applied by a gravure coater. Then, after drying at 106 ° C, the film was stretched 4.4 times in the transverse direction at 121 ° C and then 209 ° C
And a primer coating layer (P1) was applied to form a laminated film (P layer / E layer / P layer). The total thickness of this laminated film is 172 μm, and the primer coating layer (P
The thickness of 1) was 0.08 μm.

Further, on both sides of this film, 37% by weight of ossein gelatin made from the bones of cows, 17% by weight of titanium oxide (average particle size 0.05 μm), 85 mol% of ethylene component, and 7% of ethyl acrylate component. mole%, component represented by the formula _{(III -1) (-CH 2 CH} - [(CO
NH) (CH ₂ ) ₃ N ⁺ (CH ₃ ) ₃ ] [CH ₃ S
O ₃ ⁻ ]) 7 mol% of copolymer (K-1, average molecular weight:
5,250) 31% by weight and ethylene oxide / propylene oxide copolymer (average molecular weight: 6,550) 15
A laminated film (Z layer / P layer / E layer / E layer / E layer / Z layer) was formed by coating an 8% by weight aqueous coating solution of a composition of 10% by weight with a reverse roll coater and drying at 110 ° C. for 2 minutes. P layer / Z layer) was prepared. The thickness of this gelatin layer was 0.82 μm. Table 1 shows the properties of the obtained laminated film.

[Examples 2 to 7 and Comparative Examples 1 and 2] Laminated films were obtained in the same manner as in Example 1 except that the composition and thickness of the P layer and the Z layer were changed as shown in Table 1. The characteristics of these films are shown in Table 1.

[0058]

[Table 1]

As is clear from the results shown in Table 1, the undercoat film for a photographic film of the present invention was excellent in antistatic property, adhesion to a photographic photosensitive material layer and surface energy stability. In Table 1, [P2], [Z2], [Z3], and [Z4] represent the following compositions.

[P2]: Terephthalic acid (5
4 mol%), isophthalic acid (39 mol%) and 5-Ksulfoisophthalic acid (7 mol%), ethylene glycol (58 mol%) as a glycol component, neopentyl glycol (25 mol%) and diethylene glycol (17 mol%).
40% by weight of a copolyester (average molecular weight: 17,500) obtained by using (mol%), 71 mol% of methyl methacrylate component, 4 mol% of glycidyl methacrylate component, 12 mol% of ethyl acrylate component, acrylic acid 2-
Copolymer of 8 mol% of hydroxyethyl component and 5 mol% of N-methylolacrylamide (average molecular weight: 76.0)
00) 26% by weight, polyethyleneimine (average molecular weight:
8,700) 7% by weight, ethylene oxide / propylene oxide copolymer (average molecular weight: 7,800) 12% by weight, and the above copolymer (K-1) 15% by weight.

[Z2]: 37% by weight of whale skin gelatin,
Titanium oxide (average particle size 0.05 μm) 14% by weight, ethi
Ren component 85 mol%, ethyl acrylate component 8 mol%,
The component represented by the formula (III-1) (-CH₂CH-
[(CONH) (CH₂)₃N ⁺(CH₃)₃] [CH
₃SO₃ ^-]) 6 mol% of copolymer (K-2, average molecule)
Amount: 5,950) 34% by weight and ethylene oxide
Propylene oxide copolymer (average molecular weight: 6,55
0) Composition consisting of 15% by weight

[Z3]: 61 mol% methyl methacrylate component, 4 mol% glycidyl methacrylate component, 22 mol% ethyl acrylate component, 8 mol% 2-hydroxyethyl acrylate component and 5 mol% N-methylol acrylamide component. Copolymer (average molecular weight: 76,000) 3
1% by weight, 37% by weight ossein gelatin made from cow bone, 17% by weight titanium oxide (average particle size: 0.05 μm) and 15% by weight ethylene oxide / propylene oxide copolymer (average molecular weight: 6,150) Composition consisting of

[Z4]: 61 mol% of methyl methacrylate component, 4 mol% of glycidyl methacrylate component, 22 mol% of ethyl acrylate component, 8 mol% of 2-hydroxyethyl acrylate component and 5 mol% of N-methylolacrylamide component. Copolymer (average molecular weight: 85,000) 2
1% by weight, 37% by weight of ossein gelatin made from bovine bone, 17% by weight of titanium oxide (average particle diameter: 0.05 μm), 10% by weight of C ₁₁ H ₂₃ SO ₃ K and ethylene oxide / propylene oxide copolymer ( Average molecular weight: 6,15
0) Composition consisting of 15% by weight

[0064]

INDUSTRIAL APPLICABILITY In the present invention, since a gelatin layer having a specific composition is used, an undercoat film for a photographic film which is excellent in antistatic property, has little change in surface energy, and is excellent in adhesiveness with a photographic photosensitive layer. Can be provided.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location G03C 1/85 G03C 1/85

Claims (2)

[Claims] 1. A structural unit (i) 6 represented by the following formula (I) on at least one surface of a polyester film (E layer).
0 to 98 mol%, the structural unit (i represented by the following formula (II)
A photograph in which a gelatin layer (Z layer) containing 3 to 60% by weight of the copolymer (A) of i) 0 to 25% by mole and the structural unit (iii) represented by the following formula (III) is 2 to 15% by mole is laminated. Undercoat film for film. Embedded image Embedded image [In the formula (II), R ¹ and R ² are H or CH ₃ ; X is a saturated hydrocarbon group having 1 to 6 carbon atoms] [In the formula (III), R ¹ and R ² are H or CH ₃ ; R ³ is an alkylene group having 2 to 10 carbon atoms; R ⁴ , R ⁵ , and R ⁶ are H or saturated carbon atoms having 1 to 5 carbon atoms. Hydrogen group; Y represents a halogen ion, an alkyl sulfate ion, an alkyl sulfonate ion or a nitrate ion. ] 2. The photograph according to claim 1, wherein a primer coating layer (P layer) is provided on at least one surface of the polyester film (E layer), and a gelatin layer (Z layer) is further laminated on the primer coating layer. Undercoat film for film.