JPH11976A - Laminated polyester film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminated film having an easy adhesive resin layer having excellent adhesive properties to a hydrophilic functional layer containing hydrophilic resin such as polyvinyl alcohol of an ink jet printing ink image receiving layer as a main component. SOLUTION: In the laminated film comprising an easy adhesive resin layer provided at least on one surface of a biaxially oriented polyester film support, the resin layer contains aromatic copolymer polyester having a water dispersible functional group and polyvinyl alcohol and at least uniaxially oriented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated polyester film, and more particularly, to a biaxially oriented polyester film having at least one surface on which an easily adhesive resin layer is formed. The present invention relates to a laminated polyester formed using an adhesive resin layer.

[0002]

2. Description of the Related Art Polyethylene terephthalate (PET)
Alternatively, a polyester film represented by polyethylene naphthalate (PEN) has excellent properties such as mechanical strength, dimensional stability, flatness, heat resistance, chemical resistance, and optical properties, and is excellent in cost performance. It is used as a support film in various applications.

[0003] The biaxially stretched polyester film has a drawback in that the surface is highly crystallized and thus has a strong cohesive force, and therefore has poor adhesion to a functional layer for each application. Therefore, in order to solve such a defect, a method of laminating a polyester layer having low crystallinity on the surface of the polyester film by coextrusion, a method of applying a water-dispersible polyester resin or an acrylic resin as a primer, and the like have been proposed. (JP-B-49-10243, JP-A-52-19786, JP-A-52-19787, JP-A-54-43017, etc.).

However, in the above-mentioned known method, a support film using a polyester-based resin or an acrylic resin as a primer has a drawback in that it has poor adhesion to a functional layer mainly composed of a hydrophilic resin such as polyvinyl alcohol. .

[0005]

SUMMARY OF THE INVENTION The present invention relates to a laminated film having an easy-adhesion resin layer having excellent adhesion to a hydrophilic functional layer containing a hydrophilic resin such as polyvinyl alcohol as a main component, such as an ink jet printing ink image receiving layer. Is to solve the problem.

[0006]

Means for Solving the Problems The present inventor has made intensive studies in view of the above-mentioned problems, and as a result, has found that the above-mentioned problems can be easily solved by adopting a specific structure, thereby completing the present invention. . That is, the gist of the present invention is to provide a laminated film in which an easily adhesive resin layer is provided on at least one surface of a biaxially stretched polyester film support, wherein the easily adhesive resin layer has an aromatic copolymer having a water-dispersible functional group. The laminated film contains the polymerized polyester (A) and the polyvinyl alcohol (B) and is stretched in at least one direction.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.
In the present invention, as the polyester constituting the biaxially stretched polyester film, typically, for example, polyethylene terephthalate (PET) in which at least 80 mol% of the structural unit is ethylene terephthalate, and the structural unit 8
Polyethylene-2,6-naphthalate (PEN) in which 0 mol% or more is ethylene-2,6-naphthalate, poly-1,4-cyclohexane in which 80 mol% or more of the structural units is 1,4-cyclohexane dimethylene terephthalate Dimethylene terephthalate (PCT) and the like. In addition, polyethylene isophthalate, poly-
Examples include 1,4-butylene terephthalate (PBT).

[0008] Copolymerization components other than the above-mentioned superior constituents include, for example, propylene glycol, 1,3-butylene glycol, 2,3-butylene glycol, neopentyl glycol, trimethylene glycol, tetramethylene glycol, hexamethylene glycol. Diol components such as diethylene glycol, triethylene glycol, polyethylene glycol, polytetramethylene glycol, polyalkylene glycol, isophthalic acid,
Uses ester-forming derivatives such as 2,7-naphthalenedicarboxylic acid, 5-sodium sulfoisophthalic acid, oxalic acid, malonic acid, succinic acid, adipic acid, azelaic acid, sebacic acid, diphenyl ether dicarboxylic acid and oxymonocarboxylic acid. be able to.

As the polyester, besides a homopolymer or a copolymer, a blend of a small proportion with another resin can be used. In the present invention, the biaxially stretched polyester film may contain, as a projection-forming agent, additional particles, precipitated particles, other catalyst residues, and the like, in order to impart slipperiness. The type of these projection forming agents,
The size and blending amount are appropriately selected according to the desired slipperiness and transparency.

The biaxially stretched polyester film is
If necessary, the composition may contain an antistatic agent, a stabilizer, a lubricant, a crosslinking agent, an antiblocking agent, an antioxidant, an ultraviolet absorber, a light blocking agent, a coloring agent, and the like. Furthermore, white pigments represented by titanium oxide, barium sulfate, magnesium oxide and the like for whitening the film, and resins incompatible with polyester for the purpose of lowering the density, for example, polypropylene, polystyrene, poly-4 A void-forming agent such as methylpentene;

Further, the polyester film of the present invention comprises:
It may have a multilayer structure, in which case some of the layers may be formed of a polymer other than polyester. The laminated polyester film of the present invention is obtained by providing an easily adhesive resin layer on at least one surface of a biaxially stretched polyester film. The greatest feature of the present invention is that the easily-adhesive resin layer for forming the above-mentioned laminated film contains an aromatic polyester (A) having a water-dispersible functional group and polyvinyl alcohol (B), and at least The point is that it is stretched in a uniaxial direction.

The easy-adhesion layer containing an aromatic copolymerized polyester having a water-dispersible functional group and polyvinyl alcohol enhances the adhesion between the biaxially oriented polyester film support and the hydrophilic functional layer. Hereinafter, for convenience, the aromatic copolymer polyester having a water-dispersible functional group contained in the easily adhesive resin layer is referred to as an easily adhesive polyester. The easily adhesive polyester of the present invention can be synthesized by a usual polycondensation reaction using the following hydroxy compound and carboxylic acid compound as raw materials.

The hydroxy compound copolymerized with the easily adhesive polyester of the present invention includes an aliphatic hydroxy compound, an alicyclic hydroxy compound and an aromatic hydroxy compound, preferably an aliphatic hydroxy compound and an alicyclic hydroxy compound. Polymerized. When a condensed diol of ethylene glycol such as diethylene glycol is used, its component should be at most 20 mol%, more preferably at most 10 mol%, especially at most 5 mol%, based on all hydroxy compound components contained in the easily adhesive polyester. When the amount of the component is too large, sufficient anti-blocking property and adhesiveness may not be obtained as the easily adhesive resin layer.

When an aromatic hydroxy compound is used, the content of the hydroxy compound component is preferably at most 5 mol%, more preferably at most 2 mol%, based on all the hydroxy compound components contained in the easily adhesive polyester. If the amount of the component is too large, sufficient adhesiveness may not be obtained as the easily-adhesive resin layer. Further, in the process of stretching the easily adhesive resin layer together with the base polyester film, it may be difficult to obtain sufficient stretchability.

As the carboxylic acid compound copolymerized with the easily adhesive polyester of the present invention, an aromatic carboxylic acid compound,
There are alicyclic carboxylic compounds and aliphatic carboxylic compounds. When an aromatic carboxylic acid compound is used, the carboxylic acid component is preferably 98% or less, more preferably 95% by mol or less, particularly preferably 90% by mol or less based on all carboxylic acid components contained in the easily adhesive polyester. . The smaller the amount of the component, the more easily the adhesive resin layer can exhibit sufficient adhesiveness. The lower limit of the total carboxylic acid component contained in the easily adhesive polyester of the aromatic carboxylic acid compound is usually 50.
Mol% or more. If the content of the component is less than 50 mol%, it may be difficult to exhibit sufficient blocking resistance as an easily adhesive resin layer.

When an aliphatic carboxylic acid compound is used, its carboxylic acid component is at most 5 mol%, more preferably at most 2 mol%, especially at most 0 mol%, based on all carboxylic acid components contained in the easily adhesive polyester. It is preferable that when the content of the component is large, the adhesiveness of the easily adhesive resin layer is excellent, but it may be difficult to exhibit sufficient blocking resistance.

The carboxylic acid component in the composition of the easily adhesive polyester is obtained by copolymerizing an aromatic carboxylic acid compound in an amount of 50 mol% or more and an alicyclic carboxylic acid in an amount of 2 to 50 mol% based on all carboxylic acid components. Further, those obtained by copolymerizing the aromatic carboxylic acid in the range of 60 mol% or more and the alicyclic carboxylic acid in the range of 10 to 40 mol% based on all the carboxylic acid components are preferable.

The ester-forming compound having a water-dispersible functional group constituting the easily adhesive polyester used in the present invention is:
For example, an ester-forming compound containing an organic acid group such as a hydroxyl group, a sulfonic acid group, a carboxylic acid group, a phosphoric acid group and / or a base thereof, preferably an aromatic carboxylic acid compound having a sulfonic acid salt, a carboxylic acid salt An aromatic carboxylic acid compound having a sulfonic acid salt, a hydroxy compound having a sulfonic acid salt, a hydroxy compound having a carboxylic acid salt, or the like is used. Among these, an aromatic carboxylic acid compound having a sulfonic acid salt and a hydroxy compound having a carboxylic acid salt are particularly preferably used.

The ester-forming compound having a water-dispersible functional group is used in an amount of 1 to 1 with respect to all hydroxy compounds or all carboxylic acid compounds forming an easily adhesive polyester.
It is preferably 5 mol%, more preferably 1 to 12 mol%, particularly preferably 3 to 12 mol%. If the amount of the component is too large, sufficient adhesion and blocking resistance may not be obtained as an easily adhesive layer. If the amount of the component is too small, the adhesiveness and applicability tend to decrease when a hydrophilic resin layer such as polyvinyl alcohol is provided as the functional layer.

The easily-adhesive polyester used in the present invention may be any copolymer polyester comprising the structural units in the above-mentioned range. Average molecular weight (G
PC) is not particularly limited, but is usually 5,000 or more,
Preferably, 8000 or more are used. If the average molecular weight of the easily-adhesive polyester is less than 5,000, the adhesion of the easily-adhesive resin layer to the water-resistant / functional layer tends to decrease.

The glass transition temperature (T
The lower limit of g) is 20 ° C. or higher, further 30 ° C. or higher, especially 4 ° C.
The temperature is preferably 0 ° C. or higher. Glass transition temperature is 20
When the temperature is lower than 0 ° C, sufficient blocking resistance may not be obtained when an easily adhesive resin layer is formed. Further, the upper limit of the glass transition temperature of the easily adhesive polyester is preferably 140 ° C. or less. When the glass transition temperature exceeds 140 ° C., it may be difficult to obtain sufficient stretching aptitude in the process of stretching the easily adhesive resin layer together with the base polyester film.

The polyvinyl alcohol used in the present invention is
It can be synthesized by a usual polymerization reaction, and is not particularly limited as long as it is water-soluble. The degree of polymerization of polyvinyl alcohol is not particularly limited, but is usually 100 or more,
Preferably 300 to 40,000 are used. When the degree of polymerization is 1,000 or less, the water resistance of the easily adhesive resin layer decreases.

The degree of saponification of the polyvinyl alcohol of the present invention is not particularly limited.
Preferably, a saponified polyvinyl acetate having a content of 80 mol% or more and 99.9 mol% or less is practically used. The copolymer resin having vinylpyrrolidone as a main constituent unit (hereinafter referred to as a vinylpyrrolidone polymer) of the present invention can be synthesized by a usual polymerization reaction.

The vinylpyrrolidone polymer of the present invention may be a homopolymer, but the content of the vinylpyrrolidone component is 5%.
As long as it does not fall below 0% by weight, other vinyl groups, allyl groups,
It may be a copolymer with another monomer component having an addition-polymerizable unsaturated group represented by an acrylic group. Examples of the monomer having another addition-polymerizable unsaturated group copolymerized with the vinylpyrrolidone polymer include an alkyl group, an alkyl ester group, an alkyl ether group, an alkylol group in a side chain,
Amide group, hydroxyl group, amino group (secondary, tertiary, quaternary
Grade), polyalkyl ethers, carboxylic acid groups, carboxylic acid groups, carboxylic acid ester groups, sulfonic acid groups, sulfonic acid groups, sulfonic acid ester groups, phosphoric acid groups, phosphate groups,
Those having a phosphate group are selected.

The vinylpyrrolidone polymer of the present invention may be polymerized alone, but the above-mentioned easily-adhesive polyester or polyvinyl alcohol used for forming the easily-adhesive resin layer of the present invention, furthermore, easily-adhesive polyester and polyvinyl alcohol The polymerization is preferably carried out in an aqueous dispersion in which the mixture is present. The vinyl pyrrolidone polymer of the present invention has a weight average molecular weight of usually 40,000 or more, preferably 50,000 to 3,000,000. When the average molecular weight is 40000 or less, the water resistance of the easily adhesive resin layer tends to decrease.

The mixing ratio of the easily adhesive polyester (A), the polyvinyl alcohol (B) and the vinylpyrrolidone polymer (C) in the easily adhesive resin layer is preferably in a range satisfying the following formulas.

[0027]

(A) / {(B) + (C)} = 1/9 to 9/1 (B) / (C) = 2/8 to 10/0 Easy-bonding polyester component If the content is too small, sufficient adhesiveness with the base polyester film may not be obtained. In order to obtain sufficient adhesiveness as an easily adhesive layer, 40
It is preferable that the content be at least part by weight.

If the amounts of the polyvinyl alcohol component and the vinylpyrrolidone polymer component are too small, sufficient adhesiveness to the functional layer made of a hydrophilic resin may not be obtained. In order to obtain sufficient adhesiveness as an easily adhesive resin layer, 1
It is preferable to contain it in an amount of 0 part by weight or more. If necessary, a water-soluble or water-dispersible binder resin other than the above-mentioned easily adhesive polyester may be used in the easily adhesive resin layer in the present invention. Examples of such a binder resin include polyurethane, acrylic resin, vinyl resin other than the above-mentioned vinylpyrrolidone polymer, epoxy resin, amide resin and the like. Each of these skeleton structures may have a substantially composite structure by copolymerization or the like. Examples of the binder resin having a composite structure include acrylic resin-grafted polyester, acrylic resin-grafted polyurethane, vinyl resin-grafted polyester, and vinyl resin-grafted polyurethane.

The amount of the binder component other than the easily adhesive polyester is 50 parts by weight or less based on the weight of the coating layer.
Further, the range is preferably 30 parts by weight or less. Further, the easily adhesive resin layer of the present invention may contain a crosslinking reactive compound as required. Examples of the crosslinking reactive compound include methylolated or alkylolated urea-based, melamine-based, guanamine-based, acrylamide-based, polyamide-based compounds, polyamines, epoxy compounds, oxazoline compounds, aziridine compounds, block isocyanate compounds, and silane cups. Ring agents, titanium coupling agents, zircon-aluminate coupling agents, metal chelates, organic acid anhydrides, organic peroxides, polyfunctional low molecular compounds such as heat or photoreactive vinyl compounds and photosensitive resins and It is selected from polymer compounds.

The cross-linking reactive compound mainly undergoes a cross-linking reaction with a functional group of the resin contained in the easily-adhesive resin layer to thereby form the cohesiveness, surface hardness, abrasion resistance, solvent resistance,
Water resistance can be improved. For example, when the functional group of the easily-adhesive resin is a hydroxyl group, the crosslinking reactive compound is preferably a melamine-based compound, a blocked isocyanate compound, an organic acid anhydride, or the like.When the functional group of the easily-adhesive polyester is an organic acid or its anhydride, As the crosslinking reactive compound, an epoxy compound, a melamine compound, an oxazoline compound, a metal chelate, or the like is preferable. When the functional group of the easily adhesive resin is an amine, the crosslinking reactive compound is preferably an epoxy compound. It is preferable to select and use a functional group contained in the adhesive resin and one having a high crosslinking reaction efficiency.

The crosslinking reactive compound may be a low molecular weight compound or a high molecular weight polymer having a reactive functional group, as long as the reactive functional group always contains at least two functional groups in one molecule. Good. The compounding amount of the crosslinking reactive compound is
A range of 50 parts by weight or less in parts by weight based on the easily adhesive resin layer,
Further, the range is preferably 30 parts by weight or less, particularly preferably 15 parts by weight or less.

Further, in the easily adhesive resin layer of the present invention, if necessary, inert particles may be contained for improving the slipperiness of the coating layer. As the inert particles, inorganic inert particles,
There are organic inert particles, and examples of the inorganic inert particles include silica sol, alumina sol, calcium carbonate, and titanium oxide. Examples of the organic inert particles include fine particles containing a homopolymer or a copolymer of a polystyrene resin, a polyacrylic resin, and a polyvinyl resin, or organic particles represented by crosslinked particles obtained by combining these with a crosslinkable component. These inert particles preferably have a softening temperature or a decomposition temperature of about 200 ° C. or more, more preferably 250 ° C. or more, and particularly preferably 300 ° C. or more.

The average particle size (d) of the inert particles is, when the average film thickness of the easily adhesive resin layer is (L), 1/3 ≦ d / L ≦
3, it is preferable to select such that the relationship of 1/2 ≦ d / L ≦ 2 is satisfied. The easily-adhesive resin layer of the present invention may contain a surfactant, an antifoaming agent, a coating improver, a thickener, a low-molecular antistatic agent, an organic lubricant, an antioxidant, an ultraviolet absorber, and foaming, if necessary. It may contain a small amount of additives such as agents, dyes and pigments. These additives may be used alone or in combination of two or more as needed.

The easily adhesive resin layer of the present invention may be formed on only one side of the polyester film, or may be formed on both sides. When it is formed on only one side, a layer different from the easy-adhesion resin layer may be formed on the opposite side, if necessary, so that the recording sheet support of the present invention can have other properties. The film before application may be subjected to a chemical treatment, a discharge treatment, or the like, in order to improve the coating property and adhesion of the coating solution to the film. Further, in order to further improve the surface characteristics of the recording sheet support of the present invention, a discharge treatment may be performed after forming the easily adhesive resin layer.

The thickness of the easily adhesive resin layer is 0.01 to 2 μm.
m, more preferably 0.02 to 0.5 μm, especially 0.03 to
A range of 0.2 μm is preferred. When the thickness of the easily-adhesive resin layer is less than 0.01 μm, sufficient adhesiveness may not be obtained, and when it exceeds 2 μm, the blocking resistance tends to be insufficient. As a method for producing the biaxially stretched polyester film, a known method can be employed. For example, a pre-dried polyester chip and necessary additives are mixed, put into a hopper into an extruder, melt-kneaded at a temperature of 200 to 300 ° C. in an extruder, extruded from a die into a sheet, and heated to about 70 ° C. or less. The sheet is quenched on a casting drum (rotary cooling drum) to obtain an unstretched sheet, and the obtained sheet is stretched in the longitudinal and / or transverse directions at an area magnification of at least 4 times, preferably at least 9 times, and
A method of performing heat setting at a temperature of 20 to 200 ° C. can be adopted.

The method of forming the easily adhesive resin layer on the surface of the biaxially stretched polyester film includes coating and laminating extrusion, and is not particularly limited, but a coating solution of the easily adhesive resin is applied during the process of manufacturing the polyester film. Is preferably adopted. Specifically, a method of applying and drying a coating liquid for forming an easily adhesive resin layer on the surface of an unstretched sheet, a method of applying and drying a coating liquid for forming an easily adhesive resin layer on the surface of a uniaxially stretched film, A method of applying a coating liquid for forming an easily adhesive resin layer on the surface of the axially stretched film and drying the applied liquid can be used. Among these, it is economical to apply a coating solution for forming an easily adhesive resin layer on the surface of an unstretched film or a uniaxially stretched film, and then simultaneously dry-harden the coating layer in the process of performing heat treatment on the film of the laminated film. .

Further, as a method for forming the easily adhesive resin layer, a method using some of the above-mentioned coating methods may be employed, if necessary. Specifically, there is a method in which the first layer is applied to the surface of the unstretched sheet and dried, then stretched in a uniaxial direction, and then the second layer is applied and dried. In the film obtained by this method, the object of the present invention is achieved if the layer forming the film surface is a laminated film that is the easily adhesive resin layer of the present invention.

As a method for applying a coating solution of an easy-adhesion resin to the surface of a polyester film, a reverse roll coater, a gravure coater, a rod coater, an air coater, which is described in "Coating Method", written by Yuji Harazaki, Maki Shoten, 1979 A doctor coater or the like can be used. It is preferable that the coating liquid used in the formation of the easily-adhesive resin layer of the present invention is usually adjusted with water as a main medium from the viewpoint of safety and hygiene. As long as water is the main medium, a small amount of an organic solvent may be contained for the purpose of improving dispersion in water or improving film forming performance. When the organic solvent is used by mixing with water as a main medium, it is necessary to use the organic solvent within a range that dissolves in water. The organic solvent may be used alone, but may be used in combination of two or more as needed.

[0039]

EXAMPLES Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited to the following examples unless it exceeds the gist. In addition, the measuring method and definition of various physical properties and characteristics in the present invention are as follows. In Examples and Comparative Examples, “parts” and “%” mean “parts by weight” and “% by weight”, respectively. (1) Aqueous Resin Adhesive Aqueous resin polyvinyl acetal (Sekisui Chemical's SREC KX-1, hereinafter referred to as KX1) was applied to the surface of the easy-adhesion layer and dried. The application was performed using KX1 adjusted to 8% by weight using a baker-type applicator so that the solution application thickness immediately after application was about 127 μm. After coating, immediately heated in an oven at 100 ℃ for 4 minutes,
The coating layer was dried. A cellophane tape (Nichiban, 18 mm width) was adhered to the dried KX1 coating layer surface, and the state of peeling at the time of rapid peeling was visually observed and judged according to the following criteria.

[0040]

[Table 1] 未 満 Less than 10% peeling: ○ (good) 10% or more, less than 50% peeling: △ (normal) 50% or more Peeling: × (defective) ───────────────────── (2) Anti-blocking properties The surface of the easily adhesive resin layer of the support film was laminated, and the temperature was 40 ° C.
Pressing is performed at 80% RH under a load of 10 kg / cm ² for 20 hours, and the pressed film surface is peeled off according to the method of measuring and quantifying the degree of blocking between plastic films determined by ASTM D1893. The degree of blocking was determined from the load applied to. The criteria are as follows.

[0041]

[Table 2] 以上 50 g or more and less than 100 g: ○ (good) 100 g or more and less than 250 g: △ (normal) 250 g or more: × (bad) ─バ イ ン ダ ー In Examples and Comparative Examples, binder resins and the like used for forming the easily adhesive resin layer are as follows. (Examples of compounds) Binder resin: A1 Copolyester containing terephthalic acid, isophthalic acid, 5-sodium sulfoisophthalic acid as a dicarboxylic acid component and ethylene glycol and diethylene glycol as a diol component Binder resin: A2 Dicarboxylic acid component Contains terephthalic acid and isophthalic acid, and as a diol component, ethylene glycol,
Copolymerized polyester containing neopentyl glycol and dimethanol propionate Water-soluble resin 1: B Polyvinyl alcohol having a saponification degree of 88 mol% and polymerization degree of 1700 Water-soluble resin 2: C Polyvinylpyrrolidone (average molecular weight = 630000) Inactive particles: D Silica sol having an average particle size of 0.05 μm Example 1 After a transesterification reaction was carried out according to a conventional method, silica particles having an average particle size of 1.4 μm dispersed in ethylene glycol were added. Next, a polycondensation reaction was carried out according to a conventional method to obtain polyethylene terephthalate having an intrinsic viscosity of 0.65.
This polyethylene terephthalate was melt-extruded at a temperature of 280 to 300 ° C. and cast on a cooling drum while using an electrostatic adhesion method to obtain an amorphous film having a thickness of about 720 μm. This film was stretched 3.7 times in the machine direction at 85 ° C., and further 3.9 times in the transverse direction at 100 ° C.
Heat treatment was performed at 10 ° C. to obtain a biaxially stretched polyester film having a thickness of 50 μm.

After longitudinal stretching of the polyester film obtained by the above-mentioned formula, 95 parts by weight of the easily adhesive polyester (A1) shown in the above compound example and 5 parts by weight of inert particles (silica sol: D) were applied to one surface of the film before transverse stretching. To prepare a water dispersion containing 5 parts by weight, and the film thickness after stretching and drying was 0.05 μm.
To obtain a laminated film. Examples 2 to 3 and Comparative Examples 1 to 5 In Example 1, the composition of the easily adhesive resin layer was changed according to the following Table 1.
A laminated film was obtained in the same manner as in Example 1, except that the film was changed as shown in (1).

Table 2 below summarizes the evaluation results of the thus obtained easily adhesive films.

[0044]

[Table 3] Table 1 -------------------------------------------- ----------------------- Vine Water-soluble Water-soluble Inert Coating thickness d / L Dar tree Resin 1 Resin 2 Particles (d) Fat (A) ( B) (C) (D) (μm) --------------------------------------- ---------------------------- Example 1 A1 = 50 B = 45 D = 5 0.05 1 Example 2 A2 = 50 B = 45 D = 5 0.05 1 Example 3 A2 = 50 B = 40 C = 5 D = 5 0.05 1 Comparative example 1 A1 = 95 D = 5 0.05 1 Comparative example 2 A2 = 95 D = 5 0.05 1 Comparative example 3 B = 95 D = 5 0.05 1 Comparative example 4 C = 95 D = 5 0.05 1 Comparative example 5 B = 50 C = 45 D = 5 0.05 1 ------------------- ------------------------------------------------

[0045]

[Table 4]

[0046]

According to the laminated film of the present invention, OHP
P as a functional layer for films, labels, plotter films, photographic films, photographic printing paper films, bar code labels, magnetic cards, graphic arts, etc.
It is possible to provide a laminated film having good adhesiveness to all of the cases where a layer containing an aqueous resin such as VOH is used, and its industrial value is high.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI C09J 139/06 C09J 139/06 167/00 167/00

Claims (4)

[Claims] 1. A laminated film comprising an easily adhesive resin layer provided on at least one surface of a biaxially stretched polyester film support, wherein the easily adhesive resin layer is an aromatic copolymer polyester having a water-dispersible functional group ( A) a laminated film comprising: A) and polyvinyl alcohol (B), and being stretched in at least one direction. 2. An easy-adhesion resin layer comprising vinylpyrrolidone (C)
The laminated film according to claim 1, further comprising a copolymer resin having as a main constituent unit. 3. The resin (A) contained in the easily adhesive resin layer,
The laminated film according to claim 1 or 2, wherein the weight ratio of (B) and (C) is a ratio in the following formula and range. (A) / {(B) + (C)} = 1/9 to 9/1 (B) / (C) = 2/8 to 10/0 4. The easy-adhesion resin layer contains inert particles, and the thickness (L) of the easy-adhesion resin layer and the average particle size (d) of the inert particles satisfy the following relationship. The laminated film according to claim 1. [Expression 2] 1/3 ≦ d / L ≦ 3