JP2001205768A - Aromatic polyester resin laminated film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a film having excellent biodegradability, transparency, high mechanical strength and low temperature heat sealability in a wide temperature range. SOLUTION: An aromatic polyester resin laminated film comprises an acrylic resin layer having heat sealability provided on at least one surface of an aromatic polyester resin oriented film having biodegradability. In this case, as the polyester resin, a polymer obtained by adding an aliphatic glycol and an aromatic dicarboxylic acid having a sulfonic acid metal base as a nuclear substituent and an aliphatic dicarboxylic acid or an aliphatic hydroxycarboxylic acid as needed, and conducting a polycondensation reaction between these components is preferred. As the acrylic resin, a copolymer of an acrylic monomer having a glass transition point of 0 to 70 deg.C is preferred, and its thickness is suitably 0.2 to 5 μm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a biodegradable aromatic polyester resin-based laminated film, and more particularly to a biodegradable film having transparency, mechanical strength, and low-temperature heat sealability suitable for packaging materials. The present invention relates to an aromatic polyester resin-based laminated film having properties.

[0002]

2. Description of the Related Art Biodegradable films have attracted attention for the purpose of facilitating disposal of plastic films, and various films have been developed. The biodegradable film undergoes hydrolysis or biodegradation in soil or water, and the film gradually disintegrates or decomposes, and finally changes into a harmless decomposed product by the action of microorganisms. As such a film, a film formed from a certain kind of aliphatic polyester resin or aromatic polyester resin, polyvinyl alcohol, cellulose acetate, starch or the like is known.

However, when they are compared with films of polyolefin resins and polyester resins which are currently used as packaging materials, most of the biodegradable plastic films except for the polylactic acid-based stretched films are mechanical. It has not yet reached a satisfactory level in terms of strength and transparency.

On the other hand, when a plastic film is used as a packaging material for foods, pharmaceuticals, etc., the film is required to have heat sealability for the sealing operation of an object to be packaged. In particular, a so-called low-temperature heat sealing property that enables strong heat sealing under a low sealing temperature condition is demanded. However, it is difficult for most biodegradable plastic films to design packaging materials that maintain good transparency and mechanical strength and have excellent heat sealability, especially low-temperature heat sealability. Applications for packaging materials used in a wide range of applications are limited.

On the other hand, conventionally, a film provided with a coating layer of a polyvinylidene chloride copolymer resin or an ionomer resin in order to impart heat sealing properties to the surface of a polyolefin stretched film such as an OPP film has been known. However, these resins have neither biodegradability nor polyolefin-based resin as a film base material, nor heat-sealing imparting resin.

[0006]

SUMMARY OF THE INVENTION Accordingly, the present invention is directed to a biodegradable film having excellent transparency and high mechanical strength required for a packaging material and excellent low-temperature heat sealability. The purpose is to provide a film having the same.

[0007]

That is, the present invention relates to an aromatic polyester resin based film in which an acrylic resin layer having heat sealing properties is provided on at least one surface of an oriented aromatic polyester resin film having biodegradability. It relates to a laminated film.

The aromatic polyester resin is preferably a polyester containing, as one copolymerization component, an aromatic dicarboxylic acid having a metal sulfonate group as a nuclear substituent, and more specifically, an aromatic dicarboxylic acid, an aliphatic glycol, And an aromatic dicarboxylic acid having a sulfonic acid metal base as a nuclear substituent, an aliphatic dicarboxylic acid or an aliphatic hydroxycarboxylic acid as required, and a polyester obtained by performing a polycondensation reaction between the components. desirable.

The preferred composition of the polyester resin is such that the unit derived from the aromatic dicarboxylic acid component is 30 to 49.9 mol%, and the unit derived from the aliphatic glycol component is 35 to 5%.
0 mol%, 0.1 to 5 mol% of units derived from an aromatic dicarboxylic acid component having a sulfonic acid metal base as a nuclear substituent, and 0 units derived from an aliphatic dicarboxylic acid or an aliphatic hydroxycarboxylic acid component. ３０30 mol% (here, the sum of all units is 100 mol%).

Further, the acrylic resin is a polymer of an acrylic monomer having heat sealing properties, and preferably has a glass transition point of 0 to 70 ° C. Particularly, a terpolymer of methacrylic acid / methyl acrylate / methyl methacrylate or a terpolymer of methacrylic acid / isobutyl acrylate / methyl methacrylate is desirable. Further, its layer thickness is suitably from 0.2 to 5 μm.

[0011] Such a laminated film has biodegradability as a whole film, and has excellent transparency and mechanical strength, as well as low-temperature heat sealability, so that it is widely used as a packaging material. It can be suitably used.

[0012]

DETAILED DESCRIPTION OF THE INVENTION The laminated film according to the present invention comprises:
It is a film in which a specific aromatic polyester resin base film layer and an acrylic resin layer are laminated. Next, the configuration of the laminated film will be described in detail.

Aromatic polyester resin The composition of the aromatic polyester resin used in the present invention is not particularly limited as long as the resin has biodegradability. Basically, an aromatic polyester resin formed by the polycondensation of an aromatic dicarboxylic acid and an aliphatic glycol, which has a metal sulfonate as a core substituent in order to impart biodegradability. Polyester resins containing an acid as one of the copolymerization components are preferred.
In addition, in order to impart and improve the properties such as flexibility and biodegradability to the film, a multi-component polyester resin further added with an aliphatic dicarboxylic acid or an aliphatic hydroxycarboxylic acid as a copolymer component. There may be. Such resins are described in JP-A-5-507109, JP-A-6-505040, JP-A-6-505513 and the like.

Preferred aromatic polyester resins are aromatic dicarboxylic acids and aliphatic glycols as the main components, aromatic dicarboxylic acids having a sulfonic acid metal base as a nuclear substituent, and aliphatic dicarboxylic acids or aliphatic hydroxycarboxylic acids. A polyester obtained by adding an acid as an auxiliary component and allowing a polycondensation reaction to proceed between these components.

Examples of the aromatic dicarboxylic acid include terephthalic acid, isophthalic acid, naphthalenedicarboxylic acid and the like, and derivatives having an ester-forming ability such as dialkyl esters thereof can also be used. Among them, the use of terephthalic acid or dimethyl terephthalate is preferred. Further, two or more of the above dicarboxylic acids may be used in combination.

Examples of the aliphatic glycol include alkylene glycols such as ethylene glycol, propylene glycol, and butylene glycol, and oligomers thereof, for example, diethylene glycol, triethylene glycol, dipropylene glycol, and higher molecular weight poly (ethylene glycol). Polyalkylene glycols such as alkylene glycol can also be used. Further, two or more of the above glycols may be used in combination. Oligomers such as diethylene glycol have the effect of appropriately adjusting the mechanical properties, hydrolyzability, or biodegradability of the polyester resin.Therefore, it is preferable to use an alkylene glycol and a polyalkylene glycol in combination. preferable. Among them, the combined use of ethylene glycol and diethylene glycol is desirable.

The aromatic dicarboxylic acid having a sulfonic acid metal base as a nuclear substituent includes a sulfonic acid metal base (—SO ₃ M) bonded as a substituent to the benzene ring of an aromatic dicarboxylic acid such as phthalic acid or isophthalic acid. This is a compound. The metal (M) is, for example, an alkali metal such as lithium, sodium and potassium, or an alkaline earth metal such as magnesium and calcium. Preferred examples include a metal salt of 5-sulfo-isophthalic acid, a metal salt of 4-sulfo-isophthalic acid, and a metal salt of 4-sulfo-phthalic acid. This component is added for the purpose of imparting hydrolyzability or biodegradability to the aromatic polyester resin, and sodium 5-sulfo-isophthalate is particularly preferred because of its high effect. The aromatic dicarboxylic acid may be in the form of an alkyl ester, and can be used, for example, in the form of sodium dimethyl-5-sulfoisophthalate.

Examples of the aliphatic dicarboxylic acid include azelaic acid, succinic acid, adipic acid, sebacic acid, glutaric acid and the like. Examples of the aliphatic hydroxycarboxylic acid include glycolic acid, hydroxyacetic acid, lactic acid and caprolactone. And the like. The aliphatic dicarboxylic acid or aliphatic hydroxycarboxylic acid is used for lowering the glass transition temperature of the aromatic polyester resin, preferably to 70 ° C. or lower, or for improving the hydrolyzability and biodegradability of the resin. It is added as one of the polymerization components.

The above-mentioned polycondensation reaction between the components is carried out at 200 ° C. in the presence of a catalyst such as antimony oxide or germanium oxide.
By performing the above high temperature and reduced pressure, a linear polyester resin in which units derived from these components are randomly distributed along the molecular chain can be obtained.

The content of the unit derived from each component in the polycondensed polyester resin is 30 to 49.9, preferably 37 to 48.
7 mol%, 35 units derived from the aliphatic glycol component
-50, preferably 40-49 mol%, and 0.1-5, preferably 0.3-3 mol% of units derived from an aromatic dicarboxylic acid component having a sulfonic acid metal base as a nuclear substituent, and aliphatic The unit derived from the dicarboxylic acid or aliphatic hydroxycarboxylic acid component is 0 to 30, preferably 2 to 20 mol%. Here, the sum of all units is 100
Mol%.

In a preferred aromatic polyester resin, the unit derived from the terephthalic acid component is 30 to 49.9, preferably 37 to 48.7 mol%, and the unit derived from the ethylene glycol component is 15 to 48, preferably 20. ~ 45 mol%, units derived from the diethylene glycol component are 1-2
9, preferably 4 to 20 mol%, 0.1 to 5, preferably 0.3 to 3 mol% of units derived from an aromatic dicarboxylic acid component having a sulfonic acid metal base as a nuclear substituent, and aliphatic dicarboxylic acid. The unit derived from the acid or aliphatic hydroxycarboxylic acid component has 0 to 30, preferably 2 to 2 units.
0 mol%. Here, the sum of all units is 100 mol%
become.

The aromatic polyester resin used in the present invention has a weight average molecular weight of 10,000 to 500,000.
A range of 00 is preferred. The melt flow rate is 220 ° C., 21 ° C. in accordance with ASTM D-1238.
The value measured under a load of 60 g is 0.1 to 100 (g / 1
0 minutes). When the molecular weight and the melt flow rate are in the above-mentioned ranges, the composition exhibits a melt viscosity suitable for extrusion molding and has sufficient mechanical strength as a laminated film substrate layer.

Prior to film formation, the polyester resin may contain other polymer materials, plasticizers, lubricants, inorganic fillers, antioxidants, weather stabilizers, antistatic agents, as long as the object of the present invention is not impaired. Pigments, dyes and the like can be added.

Acrylic Resin The acrylic resin used in the present invention is a resin having heat sealing properties, and is an acrylic monomer,
A polymer of a monomer selected from the group consisting of acrylic acid, methacrylic acid, and derivatives thereof, which may be a homopolymer or a copolymer. In the case of a copolymer, a polymer obtained by copolymerizing another unsaturated carboxylic acid or a derivative thereof together with a two-component or three- or more-component polymer between acrylic monomers may be used.

Examples of the acrylic acid and methacrylic acid derivatives include alkyl acrylates and alkyl methacrylates. Specifically, methyl acrylate, ethyl acrylate, propyl acrylate, n-butyl acrylate, isobutyl acrylate, tert-butyl acrylate Examples thereof include butyl acrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, and tert-butyl methacrylate. Derivatives other than alkyl esters include, for example, 2-hydroxyethyl acrylate and 2-hydroxyethyl acrylate.
Examples thereof include hydroxyalkyl esters such as hydroxyethyl methacrylate. Examples of the unsaturated carboxylic acid copolymerized as required include itaconic acid, maleic acid, fumaric acid and the like.

Preferred examples of the acrylic resin include:
(A) a copolymer of alkyl acrylate and alkyl methacrylate, (b) a copolymer of methacrylic acid or acrylic acid and alkyl acrylate or alkyl methacrylate, (c) methacrylic acid or acrylic acid, alkyl acrylate, and alkyl methacrylate And a three-component copolymer of the above.

Specific examples of more preferred acrylic resins include terpolymers of methacrylic acid / methyl acrylate / methyl methacrylate and terpolymers of methacrylic acid / isobutyl acrylate / methyl methacrylate. These acrylic resins can be generally produced by radical polymerization, and a method such as an emulsion polymerization method, a suspension polymerization method, or a solution polymerization method can be applied in the presence of the above-mentioned monomers.

The ratio of each of the above components constituting the acrylic resin is not particularly limited, and the necessary physical properties and
For example, the composition of the monomer component may be determined in consideration of sufficient mechanical strength, heat sealing temperature, heat sealing strength, blocking resistance, and biodegradability, and the molecular weight may be adjusted.

The acrylic resin used in the present invention has a glass transition temperature of 0 to 70 ° C., preferably 10 to 60 ° C.
When the temperature is in the range of ° C., the heat sealing property is sufficiently exhibited at a low temperature and in a wide temperature range, and the blocking resistance is also good. Such a laminated film using an acrylic resin facilitates the packaging operation, protects the packaged object properly, and easily degrades and decomposes in the soil as shown in Examples described later.

In the present invention, other materials such as a lubricant such as carnauba wax, microcrystalline wax, paraffin wax, and polyethylene wax, silica, diatomaceous earth, calcium silicate, and the like are used as long as the heat sealing property is not impaired. An anti-blocking agent represented by inorganic fine particles such as bentonite and clay, an antistatic agent, an ultraviolet absorber, an antioxidant, a coloring agent, and other additives can be appropriately added.

Laminated film The laminated film according to the present invention is a film which is provided with an acrylic resin layer on at least one surface of a specific stretched aromatic polyester resin film and has excellent transparency, mechanical strength, heat sealability and the like. is there.

The stretched aromatic polyester resin film as the base material layer can be produced by first forming a cast film of the polyester resin and then subjecting the cast film to a stretch orientation treatment. This cast film is obtained by feeding a polyester resin to a single-screw or twin-screw extruder, melting the resin at a temperature equal to or higher than the melting point of the resin, extruding through a T-die or the like into a sheet or film, and then rapidly cooling to take off. Can be

The cast film once formed can be oriented uniaxially or biaxially to orient the film molecules. The stretching operation is performed in a temperature range not less than the glass transition point of the resin and not more than the crystallization temperature of the cast film by a uniaxial stretching method, or a sequential biaxial stretching method using a stretching roll and a tenter-type transverse stretching machine, or a simultaneous biaxial stretching. Done by law.

The stretching conditions vary depending on the composition of the aromatic polyester resin and the heat history of the unstretched sheet.
For example, a stretching temperature of 40 to 100 ° C. and a stretching ratio of 1.5 to
It is performed at 6.0 times. After the stretching operation, preferably heat-treated the film again and heat-set the film,
The heat treatment temperature is in a temperature range from the crystallization temperature of the resin to the melting point or less.

The film thus produced is oriented uniaxially or biaxially, and the brittleness of the unstretched film is improved. And it has excellent physical properties similar to a polypropylene stretched film, a polystyrene stretched film, and a polyethylene terephthalate stretched film. In particular, biaxially oriented exhibits high mechanical strength and is suitable as a packaging material.

When the heat setting treatment is performed, the molecular structure of the polymer is stabilized, the crystallinity is increased, and the mechanical strength of the film can be further improved. The thickness of the film is 5 to 300 μm, preferably 10 to 200 μm
The range of m is desirable for obtaining an appropriate balance of mechanical strength, transparency, and biodegradability required for the base layer of the laminated film.

Prior to laminating the acrylic resin film on the polyester resin film surface, surface activity such as corona discharge treatment, flame treatment, ozone treatment, etc., is applied to the polyester resin film surface in order to increase the adhesion and adhesion strength between the two layers. It is desirable to perform an anchoring treatment or an anchor coating treatment using an anchor treatment agent.

The acrylic resin layer is formed on one side or both sides of the aromatic polyester resin oriented film, and its thickness is such that the necessary heat seal strength can be imparted without impairing the physical properties of the base layer. It is preferably as thin as possible, and it is adjusted according to the type of acrylic resin used or the use of the laminated film. Usually, 0.2 to 5 μm (0.2 to 5 g in terms of coating amount)
/ M ² ), preferably in the range of 0.3 to 3 μm (0.3 to 3 g / m ² in terms of coating amount). This thin coating layer can provide sufficient heat sealing strength with that thickness, can avoid the formation of cracks and the like in the coating layer, and has the excellent properties of the aromatic polyester resin film serving as the base material layer. Transparency and mechanical strength can be maintained as they are.

For the acrylic resin layer, a coating method is suitable for forming a thin and uniform film. Since the acrylic resin is usually produced in the form of an aqueous solution or aqueous dispersion, it is convenient to coat the acrylic resin as it is. Particularly, direct coating with an emulsion is desirable. If desired, an organic solvent such as alcohol, a softener, and the like can be appropriately added to the coating liquid. The concentration of the acrylic resin in the coating liquid is preferably 5 to 40% by weight.

The coating method is a dipping method,
Any method such as a roll coating method, a screen printing method, and a spray method can be adopted. In particular, the roll coating method is suitable as a method for forming a uniform film at a high speed. After the coating step, the film is transferred to a drying step. There is no particular limitation on the drying method and conditions as long as the atmosphere evaporates and the transparent coating layer is formed efficiently. For example, using a hot air dryer, the drying temperature is preferably 60 to 150 ° C., and the drying time is suitably about 5 seconds to 5 minutes.

The step of coating the acrylic resin and the step of stretching the aromatic polyester resin film are as follows:
Regardless of which is performed, the desired laminated film can be obtained. If the order in which the acrylic resin is coated after stretching the aromatic polyester resin film uniaxially or biaxially is advantageous, the stretching conditions of the aromatic polyester resin film can be freely set. Conversely, if the order in which the stretching operation is performed after coating the akul-based resin is adopted, there is an advantage that the coating apparatus can be reduced in size. In the case of sequential biaxial stretching, a method in which a longitudinally stretched film of the aromatic polyester resin is once formed, then an acrylic resin is coated, and finally, the film is horizontally stretched may be employed.

The laminated film thus produced is
Depending on the use, a biodegradable plastic resin layer having a gas barrier property or a biodegradable natural product layer may be provided on the surface opposite to the acrylic resin layer. In this case, the bonding can be performed via an anchor treatment agent or an adhesive. Further, a printing layer may be provided.

[0043]

EXAMPLES Next, the present invention will be described with reference to examples, but the present invention is not limited to these examples. The physical properties of the obtained film were evaluated by the following test methods. (A) Tensile modulus: This was performed in accordance with JIS K7127. (B) Tensile strength (stress at break, elongation at break): JIS
Performed according to K7127. (C) Impact strength: Performed by a film impact method. 1
It was measured from the side opposite to the acrylic resin-coated surface using a / 2 inch cone.

(D) Haze: Performed according to JIS K6714. It measured from the side opposite to the acrylic resin coating surface. (E) Heat sealing strength: using a thermal gradient sealer, setting the sealing temperature between 90 and 130 ° C. at 20 ° C. intervals,
The acrylic resin-coated surfaces of the films were bonded to each other under the conditions of a pressure of 0.1 MPa and a time of 0.5 seconds. Thereafter, the sample width was cut to 30 mm, and the tensile speed was 30 mm.
The film was peeled into a T-shape under the condition of 0 mm / min. (F) Soil degradability: The film was left in the soil for 5 months, and the state of the film was observed.

Example 1 In a large reactor equipped with a stirrer, a nitrogen inlet and a distillation column, predetermined amounts of dimethyl terephthalate, sodium dimethyl 5-sulfo-isophthalate, hydroxyacetic acid, ethylene glycol,
Diethylene glycol was added, and a polycondensation reaction was performed using antimony trioxide, manganese acetate, and sodium acetate as a catalyst.

The composition of the obtained copolymer was 45 mol% of terephthalic acid, 37 mol% of ethylene glycol, 9 mol% of diethylene glycol, 1 mol% of sodium 5-sulfo-isophthalate, and 8 mol% of hydroxyacetic acid. The density of the copolymer resin is 1.35 (g / c
m ³ ), melting point 200 ° C., melt flow rate (220
C., 2160 g load) was 15 (g / 10 min).

The resin was preliminarily dried in an oven, supplied to an extruder (60 mmφ, cylinder set temperature 220 ° C.), melted, and extruded into a film from a T-die provided at the tip of the extruder. Thereafter, the sheet was rapidly cooled to 30 ° C. by a cast roll to finally produce a sheet having a thickness of 200 μm.
Next, this sheet was firstly subjected to 60
The film was longitudinally stretched three times at 70 ° C., then transversely stretched at 70 ° C. four times, and then heat-treated (heat set) at 180 ° C. for 5 seconds. In addition, one side of the film is subjected to corona discharge treatment,
A biaxially stretched film having a thickness of 20 μm was obtained.

Next, 50% by weight of methyl methacrylate,
Acrylic copolymer resin 10 comprising 47% by weight of isobutyl acrylate and 3% by weight of methacrylic acid
An aqueous dispersion (solid content: 20% by weight) was prepared by mixing 5 parts by weight of carnauba wax with 0 parts by weight. An aqueous dispersion of an acrylic resin was coated on the corona discharge treated surface side of the oriented aromatic polyester resin film using a Mayer bar. Then, the water was evaporated in a hot air drying oven at 70 ° C. for 20 seconds to obtain a thickness of about 1 μm (coating amount: 1 g / m 2
² ) A dried film was formed. The physical properties of this laminated film were examined, and the results are shown in Table 1.

(Comparative Example 1) Thickness 20 manufactured in Example 1
The same physical property measurement as in Example 1 was performed using a biaxially stretched aromatic polyester resin film having a thickness of μm without any coating with an acrylic resin or the like. The results are shown in Table 1.

[0050]

[Table 1]

[0051]

The laminated film according to the present invention has excellent biodegradability, so that its shape is easily collapsed after use and can contribute to protection of the natural environment. Also,
This film is suitable as a packaging material because it has excellent transparency, high mechanical strength, and flexibility, and has a heat sealing property in a low temperature and wide temperature range. It is suitable for a use, for example, a packaging film used for manufacturing bags and containers, and is particularly suitable as a material for an automatic packaging machine.

Therefore, the laminated film according to the present invention is:
Characteristics of this film, such as overlapping packaging of confectionery boxes such as gum, caramel, chocolate, etc., overlapping packaging of cassette tapes, individual packaging of confectionery, etc. Utilizing this, it can be suitably used for packaging of various foods and non-foods.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Ichiji Takeishi 9th Kitatone, Sowa-cho, Sarushima-gun, Ibaraki Pref. CD03 CD08 CD09 CD10 FA06 GA01 4J029 AA01 AA03 AA05 AB01 AD01 AE03 BA02 BA03 BA08 BF08 BF09 BF10 BF23 BH06 CA02 CA04 CA05 CA06 CB05A CB05B CB06A CB06B CC05A CH02 DB01 DB02 EA02 J04 J01F04 J02F01 J02F01 J02F02J02F02F DG001 GA05 JA09 JB01 LA02 LA06 LA11 NA06

Claims (15)

[Claims] 1. An aromatic polyester resin laminated film, comprising a heat-sealable acrylic resin layer provided on at least one surface of a biodegradable oriented aromatic polyester resin film. 2. The aromatic polyester resin according to claim 1, wherein said aromatic polyester resin is a polyester containing an aromatic dicarboxylic acid having a metal sulfonate group as a nuclear substituent as one copolymerization component. Polyester resin-based laminated film. 3. The aromatic polyester resin is an aromatic dicarboxylic acid having an aromatic dicarboxylic acid, an aliphatic glycol, and a sulfonic acid metal base as a core substituent, and optionally an aliphatic dicarboxylic acid or an aliphatic dicarboxylic acid. The aromatic polyester resin-based laminated film according to claim 1 or 2, which is a polyester obtained by adding a hydroxycarboxylic acid and performing a polycondensation reaction between these components. 4. The aromatic polyester resin-based laminated film according to claim 3, wherein the aromatic dicarboxylic acid is terephthalic acid. 5. The laminated film of claim 3, wherein the aliphatic glycol comprises an alkylene glycol and a polyalkylene glycol. 6. The aromatic dicarboxylic acid having a metal sulfonate group as a nuclear substituent, wherein the aromatic dicarboxylic acid is a metal salt of 5-sulfo-isophthalic acid, a metal salt of 4-sulfo-isophthalic acid, or a metal salt of 4-sulfo-phthalic acid. The aromatic polyester resin-based laminated film according to claim 3, which is at least one carboxylic acid compound selected from the group consisting of: 7. The method according to claim 3, wherein the aliphatic carboxylic acid is at least one carboxylic acid selected from the group consisting of azelaic acid, succinic acid, adipic acid, sebacic acid and glutaric acid. 4. The aromatic polyester resin-based laminated film according to item 1. 8. The aromatic polyester according to claim 3, wherein the aliphatic hydroxycarboxylic acid is at least one compound selected from the group consisting of glycolic acid, hydroxyacetic acid, lactic acid, and caprolactone. Resin-based laminated film. 9. The aromatic polyester resin contains 30 to 49.9 mol% of units derived from an aromatic dicarboxylic acid component, and 35 to 50 units derived from an aliphatic glycol component.
Mol%, units derived from an aromatic dicarboxylic acid component having a sulfonic acid metal base as a nuclear substituent are 0.1 to 5 mol%, and units derived from an aliphatic dicarboxylic acid or an aliphatic hydroxycarboxylic acid component are 0 to 30. The aromatic polyester resin-based laminated film according to any one of claims 1 to 8, wherein the total amount is 100 mol%. 10. The aromatic polyester resin has a unit derived from a terephthalic acid component in an amount of 30 to 49.9 mol%,
15 to 48 mol% of units derived from the ethylene glycol component, and 1 to 4 units derived from the diethylene glycol component.
29 mol%, 0.1 to 5 mol% of a unit derived from an alkali metal 5-sulfo-isophthalate component, and 0 to 30 mol% of a unit derived from an aliphatic dicarboxylic acid or an aliphatic hydroxycarboxylic acid component ( The aromatic polyester resin-based laminated film according to any one of claims 1 to 8, wherein the total of all units is 100 mol%. 11. The film according to claim 1, wherein the oriented film of the aromatic polyester resin is biaxially oriented.
An aromatic polyester resin-based laminated film according to any one of claims 10 to 10. 12. The acrylic resin according to claim 1, wherein the glass transition point is 0 to 70 ° C.
2. The aromatic polyester resin-based laminated film according to any one of 1. 13. The method according to claim 13, wherein the acrylic resin is acrylic acid,
The aromatic polyester resin-based laminated film according to any one of claims 1 to 12, wherein the copolymer is a copolymer between monomers selected from the group consisting of methacrylic acid, alkyl acrylate, and alkyl methacrylate. 14. The method according to claim 13, wherein the acrylic resin is a terpolymer of methacrylic acid / methyl acrylate / methyl methacrylate or a terpolymer of methacrylic acid / isobutyl acrylate / methyl methacrylate. The laminated film of the aromatic polyester resin according to the above. 15. The method according to claim 1, wherein said acrylic resin layer has a thickness of 0.2 to 5 μm.
The aromatic polyester resin-based laminated film according to any one of the above.