JP2003012841A - Laminated polyester film for packaging - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminated polyester film, excellent in olygomer sealing property, adhesion to a metal oxide and cutting resistance, and useful for a packaging material needing a gas barrier property, particularly. SOLUTION: The laminated polyester film for the packaging has a coating film wherein a binder resin and a coating liquid are coated, dried and oriented on at least one side surface of a polyester film. The binder resin is composed of a acryl-polyester resin and the coating liquid is composed of unreactive particles having an average particle diameter of 20-100 nm of 1-20 pts.wt. per a total of solid content.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a laminated polyester film for packaging. More specifically, it relates to a laminated polyester film which is excellent in oligomer encapsulation property, metal oxide adhesion property and abrasion resistance and is useful as a packaging material which requires gas barrier property.

[0002]

2. Description of the Related Art Polyester films, particularly polyethylene terephthalate films, are used as a constituent material for many flexible packaging films because of their excellent mechanical strength and thermal dimensional stability. Among them, foods and chemicals, since decomposition and deterioration are promoted by oxygen and water vapor, for the long-term storage, they have the effect of blocking the invasion of oxygen and water vapor from the outside air, so-called materials with excellent gas barrier properties. Need to be packed in. As a film having an excellent gas barrier property, a film in which polyvinylidene chloride or an ethylene vinyl alcohol copolymer is laminated is known, and a film in which a metal oxide thin film is formed on a polymer film substrate is known. For example, an aluminum oxide thin film formed on a polyester film is disclosed in
It is known from JP-A-179935.

However, a laminate of polyvinylidene chloride and ethylene vinyl alcohol copolymer has poor heat resistance, and has a drawback that the gas barrier property is deteriorated by high temperature wet heat treatment such as retort treatment. Further, polyvinylidene chloride generates chlorine gas when incinerated, and there is a concern that it may affect the global environment.

Further, in the case of forming a metal oxide thin film on a polyester film, it is known from Japanese Patent Laid-Open No. 2000-108285 that the gas barrier property is improved by reducing low-molecular compounds and oligomers deposited on the surface by heat treatment. Has been. However, when a polyester film is used as the substrate, the polyester film generally has poor adhesiveness with the metal oxide, causes peeling at the interface, and has a problem that the gas barrier property deteriorates.

As a solution to this problem, Japanese Patent Laid-Open No. 11-1
98326, JP-A-11-198327,
JP-A-11-334010 proposes an easy-adhesive polyester film having an easy-adhesive coating on at least one side of the film, but it is poor in oligomer encapsulation property particularly in applications where demanding performance is severe. The gas barrier property after vapor deposition of oxide is insufficient, or the abrasion resistance in the film manufacturing process or processing process is inferior, resulting in defects in the easily adhesive film, and the gas barrier property after vapor deposition of metal oxide decreases. Is a problem.

[0006]

DISCLOSURE OF THE INVENTION As a result of intensive studies to solve the above-mentioned problems, the present inventors have found that a coating film consisting of a specific resin and inert particles having a specific average particle size is formed on the surface. By using a polyester film having the substrate,
The present inventors have found that a laminated polyester film for packaging, which is excellent in oligomer encapsulation property, metal oxide adhesion property, and abrasion resistance, and which is excellent in gas barrier property after metal deposition, has been completed, and has arrived at the present invention.

[0007]

That is, according to the present invention, a binder resin made of an acrylic-polyester resin and inert particles having an average particle diameter of 20 to 100 nm are provided on at least one surface of a polyester film per total solid content. A laminated polyester film for packaging, comprising a coating film prepared by applying a coating liquid containing 1 to 20% by weight, drying and stretching.

In the present invention, the polyester constituting the polyester film is a linear saturated polyester composed of a dicarboxylic acid component and a glycol component. As the dicarboxylic acid component, terephthalic acid, isophthalic acid,
Examples thereof include 2,6-naphthalenedicarboxylic acid, hexahydroterephthalic acid, 4,4′-diphenyldicarboxylic acid, adipic acid, sebacic acid and dodecanedicarboxylic acid. Among these dicarboxylic acid components, terephthalic acid and 2,6-naphthalenedicarboxylic acid are particularly preferable from the viewpoint of the mechanical properties of the film.

As the glycol component, ethylene glycol, diethylene glycol, propylene glycol, 1,3-propanediol, 1,4-butanediol, neopentyl glycol, 1,6-hexanediol, cyclohexanedimethanol, polyethylene glycol, etc. Can be illustrated. Among these glycol components, ethylene glycol is particularly preferable from the viewpoint of film rigidity.

The polyester in the present invention may be a copolyester obtained by copolymerizing the above-mentioned dicarboxylic acid component or glycol component as the third component, and the polyester obtained is a trifunctional or higher polyvalent carboxylic acid component or polyol component. Range that is substantially linear (for example, 5
It may be a copolyester copolymerized in a small amount (mol% or less).

Such polyesters have been known for a long time and can be prepared by a conventional method. The intrinsic viscosity of this polyester (in orthochlorophenol, 35 ° C.) is 0.45 (dl / g) or more, and further 0.45 to 0.9.
It is preferably 0 (dl / g), which provides good mechanical properties such as high rigidity of the film.

In the present invention, the polyester forming the polyester film has a polycondensation metal catalyst residue of 150.
Less than ppm, and the amount of antimony is the total acid component (1mo
It is preferably 10 mmol% or less per 1),
This gives a highly transparent film.

The polyester film in the present invention is preferably a biaxially stretched film and has a thickness of 1 μm.
m or more, preferably 5 to 500 μm, particularly preferably 9
˜350 μm. If the thickness is less than 1 μm, the film is often cut during film formation, which is not preferable. On the other hand, when the thickness is more than 500 μm, the film tends to be too stiff and the film-forming property tends to be poor.

The polyester film may have a single layer structure or a multilayer structure of two or more layers formed by a coextrusion method or the like.

In the present invention, an oligomer encapsulating coating film is provided on at least one surface of the above polyester film. This coating film comprises a binder resin composed of an acrylic-polyester resin and inert particles having an average particle size of 20 to 100 nm. A coating liquid containing 1 to 20% by weight based on the total solid content is applied, dried and stretched.

The acrylic-polyester resin is used to mean an acrylic-modified polyester resin and a polyester-modified acrylic resin, and the polyester resin component (A) and the acrylic resin component (B) are bonded to each other. . This bond is, for example, a graft type,
Includes block types. Such an acrylic-polyester resin is obtained by adding a radical initiator to both ends of a polyester resin component to polymerize an acrylic monomer, or adding a radical initiator to a side chain of a polyester resin component to form an acrylic monomer. Or by attaching a hydroxyl group to the side chain of the acrylic resin component and reacting it with a polyester resin component having an isocyanate group or a carboxyl group at the end.

The polyester resin component (A) constituting the acrylic-polyester resin is a linear polyester having a dicarboxylic acid component and a glycol component as constituent components. As the dicarboxylic acid component, terephthalic acid,
Isophthalic acid, phthalic acid, 2,6-naphthalenedicarboxylic acid, 4,4′-diphenyldicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, adipic acid, sebacic acid,
Examples thereof include phenylindanedicarboxylic acid and dimer acid. Two or more kinds of these components can be used. Further, in combination with these components, unsaturated polybasic acids such as maleic acid, fumaric acid and itaconic acid, and hydroxycarboxylic acids such as p-hydroxybenzoic acid and p- (β-hydroxyethoxy) benzoic acid are used in small proportions. You can The ratio of the unsaturated polybasic acid component and the hydroxycarboxylic acid component is at most 10 mol%, preferably 5 mol% or less.

The glycol component may be ethylene glycol, 1,4-butanediol, neopentyl glycol, diethylene glycol, dipropylene glycol, 1,6-hexanediol, 1,4-cyclohexanedimethanol, xylylene glycol, diethylene glycol. Examples thereof include methylolpropionic acid, glycerin, trimethylolpropane, poly (ethyleneoxy) glycol, poly (tetramethyleneoxy) glycol, an alkylene oxide adduct of bisphenol A, and an alkylene oxide adduct of hydrogenated bisphenol A.
These can use 2 or more types.

Among such glycol components, ethylene glycol, ethylene oxide adduct of bisphenol A and polypropylene oxide adduct, and 1,4-butanediol are preferable, and ethylene glycol and bisphenol A ethylene oxide adduct and propylene oxide are more preferable. It is an adjunct.

The polyester resin component may be copolymerized with a small amount of a compound having a sulfonate group or a compound having a carboxylic acid group in order to facilitate aqueous liquefaction. preferable.

Examples of the compound having a sulfonate group include 5-Nasulfoisophthalic acid, 5-ammoniumsulfoisophthalic acid, 4-Nasulfoisophthalic acid, 4-methylammoniumsulfoisophthalic acid, 2-
Na sulfoisophthalic acid, 5-K sulfoisophthalic acid,
Preferable examples include sulfonic acid alkali metal salt-based compounds such as 4-K sulfoisophthalic acid, 2-K sulfoisophthalic acid, and Na sulfosuccinic acid, or sulfonic acid amine salt-based compounds.

Examples of the compound having a carboxylic acid group include trimellitic anhydride, trimellitic acid, pyromellitic dianhydride, pyromellitic acid, trimesic acid, cyclobutanetetracarboxylic acid, dimethylolpropionic acid, and the like, or monos thereof. Examples thereof include alkali metal salts. After the copolymerization, the free carboxyl group is reacted with an alkali metal compound or an amine compound to form a carboxylate group.

The acrylic resin component (B) constituting the acrylic-polyester resin has acrylic acid, methyl acrylate, ethyl acrylate, butyl acrylate, sodium acrylate, ammonium acrylate, and 2 as its monomer components. -Hydroxyethyl acrylate,
Examples thereof include methacrylic acid, methyl methacrylate, ethyl methacrylate, butyl methacrylate, sodium methacrylate, ammonium methacrylate, 2-hydroxyethyl methacrylate, acrylonitrile, acrylamide, methacrylamide, and N-methylol methacrylamide. These monomer components should be used in combination with other unsaturated monomer components such as styrene, vinyl acetate, vinyl chloride, vinylidene chloride, divinylbenzene, sodium styrenesulfonate, sodium vinylsulfonate and sodium methallylsulfonate. You can also

The acrylic resin component further comprises an alkyl methacrylate component of 50 mol% to 95 mol% and an epoxy group-containing acrylic monomer component of 3 mol%.
It is preferable that the main component is a component that is 30 mol% or less and the alkyl acrylate component is 3 mol% or more and 30 mol% or less. The proportion of the acrylic methacrylate component is more preferably 60 mol% or more and 90 mol% or less. If this ratio is less than 50 mol%, it becomes difficult to polymerize the acrylic-polyester resin. On the other hand, when it exceeds 96 mol%, the ratio of the epoxy group-containing acrylic monomer component and the alkyl acrylate component decreases, and the abrasion resistance deteriorates.

The molar ratio of the polyester resin component / acrylic resin component of the acrylic-polyester resin is preferably 1/9 or more and 5/5 or less, more preferably 2/8 or more and 4
/ 6 or less. If this ratio is less than 1/9, the adhesion of the coating film to the polyester film will be insufficient, while 5/5
When it exceeds, the abrasion resistance of the coating film and the sealing property of the oligomer become poor, which is not preferable.

In the coating liquid for forming the oligomer-encapsulating coating film in the present invention, a binder resin other than the above may be blended in order to adjust the adhesiveness between the coating film and the polyester film. Examples of such resin include polyurethane resin, epoxy resin, vinyl resin, polyether resin,
Examples thereof include water-soluble resins.

The oligomer-encapsulating coating film of the present invention must contain inert particles having an average particle size of 20 to 100 nm in an amount of 1 to 20% by weight based on the total solid content in the coating liquid. It is preferably 3 to 15% by weight. Examples of the inert particles include calcium carbonate, magnesium carbonate, calcium oxide, zinc oxide, magnesium oxide,
Inorganic particles such as silicon oxide, sodium silicate, aluminum hydroxide, iron oxide, zirconium oxide, barium sulfate, titanium oxide, tin oxide, carbon black, molybdenum disulfide, acrylic cross-linked polymer, styrene cross-linked polymer, silicone Organic particles such as resin, fluororesin, benzoguanamine resin, phenol resin, nylon resin and polyethylene wax can be mentioned.

The average particle size of the inert particles is 20 to 10
It is necessary to be 0 nm, but preferably 25 to 8
It is 0 nm. If the average particle size is less than 20 nm,
The abrasion resistance is poor in the film manufacturing process and the processing process, and the gas barrier property after metal oxide deposition is deteriorated. On the other hand, 100
When it exceeds nm, the transparency is impaired. Further, the amount of the inert particles needs to be 1 to 20% by weight based on the total solid content in the coating liquid, but if it is less than 1% by weight, the abrasion resistance in the film manufacturing process and the processing process is poor. On the other hand, if it exceeds 20% by weight, the transparency is impaired.

The coating liquid for forming the oligomer-encapsulating coating film in the present invention is to improve the stability of the coating liquid, especially the aqueous coating liquid, and to improve the wettability when the coating liquid is applied to the polyester film. , A surfactant can be added. Examples of the surfactant include nonionic surfactants such as alkylene oxide homopolymers, alkylene oxide copolymers, aliphatic alcohol / alkylene oxide adducts, polyhydric alcohol fatty acid esters, long-chain aliphatic amide alcohols, and quaternary surfactants. Examples thereof include cationic or anionic surfactants such as a compound having an ammonium salt, a compound having an alkylpyridinium salt, and a compound having a sulfonate, and a nonionic surfactant is particularly preferable.

The solid content concentration of the coating liquid in the present invention is 0.5.
It is preferably ˜30% by weight. If the solid content concentration is less than 0.5% by weight, wettability to the polyester film is insufficient, while if it exceeds 30% by weight, the coating appearance tends to deteriorate.

In the present invention, the coating liquid containing each of the above-mentioned components is applied to at least one side of the polyester film, and the polyester film is preferably a polyester film before orientation crystals are completed. As the polyester film before the oriented crystals are completed, an unstretched film formed by heat-melting polyester to form a film as it is, a uniaxially stretched film in which the unstretched film is oriented in either the longitudinal direction or the transverse direction, Examples thereof include those which are stretched and oriented in a low-magnification direction in both the machine direction and the transverse direction (a biaxially stretched film before being finally re-stretched in the machine direction and the transverse direction to complete the oriented crystallization). .

As a method for applying the coating liquid to the polyester film, any known coating method can be applied. For example,
A roll coating method, a gravure coating method, a micro gravure coating method, a reverse coating method, a roll brush method, a spray coating method, an air knife coating method, an impregnation method, a curtain coating method or the like may be applied alone or in combination. When an aqueous coating liquid is used, a small amount of organic solvent may be included for the purpose of helping the stability of the coating liquid.

The coating amount is preferably 0.5 to 50 g, and more preferably 5 to 3 per 1 m ² of the running film.
It is 0 g. The final dry coating film thickness is 0.02
1 μm is preferable, and more preferably 0.02 to 0.8 μm.
m. If the thickness of the coating film is less than 0.02 μm, the oligomer sealing property becomes insufficient, while if it exceeds 1 μm, the blocking resistance tends to decrease. The application is
Depending on the intended use of the film, it can be done on one side only or on both sides. After coating, a uniform coating film is obtained by drying.

In the present invention, the polyester film is coated with the coating liquid, and then dried and stretched. The drying is preferably performed at 90 to 130 ° C. for 2 to 20 seconds.
Further, this drying can also serve as a residual heat treatment of the stretching treatment or a heat treatment during the stretching. The polyester film is stretched at a temperature of 70 to 140 ° C. in the longitudinal direction of 2.5 to 7
It is preferable to stretch at a stretch ratio of 2.5 to 7 times in the transverse direction, an area magnification of 8 times or more, and further 9 to 28 times. In the case of re-stretching, it is preferable to stretch at a draw ratio of 1.05 to 3 times (however, the area magnification is the same as above). The heat setting treatment after stretching is
It is preferable to perform the heating at a temperature higher than the final stretching temperature and lower than the melting point for 1 to 30 seconds. For example, for a polyethylene terephthalate film, it is preferable to heat-fix at 170 to 240 ° C. for 2 to 30 seconds.

The polyester film in the present invention is
The center line average roughness (Ra) of the surface having the coating film is preferably 1 nm or more and less than 20 nm. This surface roughness (R
When a) is less than 1 nm, the abrasion resistance in the film manufacturing process and the processing process may be poor. On the other hand, when the thickness is 20 nm or more, surface defects of the transparent vapor deposition layer are likely to occur and the gas barrier property is deteriorated, which is not preferable.

The thus-obtained oligomer-encapsulating laminated polyester film is excellent in oligomer-encapsulating property, metal oxide adhesion and abrasion resistance, and excellent in gas barrier property after metal oxide vapor deposition, and particularly in packaging. It is extremely useful as a material film.

[0037]

EXAMPLES The present invention will now be described in detail with reference to examples, but the present invention is not limited to the following examples. The evaluation in the present invention was performed by the following method.

1. Intrinsic viscosity ([η]) A value (unit: dl / g) measured at 35 ° C. using o-chlorophenol as a solvent.

2. Center line average roughness (Ra) According to the method specified in JIS B-6601, using a surface roughness meter (Surfcom 3B type manufactured by Tokyo Seimitsu Co., Ltd.) with a cutoff of 0.25 mm and a measuring stylus with a radius of 3 μm. taking measurement.

3. Haze Measured according to JIS K-6714 and converted to a thickness of 12 μm. The haze is preferably 2.5% or less.

4. Scrap resistance Using a film sample cut into a width of 20 mm, the coated surface of the film was applied to a cylindrical stainless steel fixed bar with a diameter of 10 mm, run for 80 m under a load of 200 g, and then adhered to the bar. The white powder of the formed coating film is observed, and the abrasion resistance is evaluated according to the following criteria. Rank A: No white powder adhered to the bar (good abrasion resistance) Rank B: White powder slightly adhered to the bar (slight abrasion resistance slightly good) C: Large amount of white powder adhered to the bar (poor abrasion resistance)

5. After the sample film cut into the oligomer sealing property of 150 mm × 100 mm was heat-treated at 150 ° C. for 1 hr in a dryer,
Cool the sample film to room temperature by leaving it still, taking care not to touch it with your fingers. The surface of the obtained sample film was observed with a microscope (reflection, magnification: 50 times,
200 times) and the oligomer sealing property is evaluated according to the following criteria. Rank A: No oligomer is generated (good oligomer sealing property) Rank B: Some oligomer is generated (some oligomer sealing property) Rank C: A large amount of oligomer is generated (poor oligomer sealing property)

6. Oxygen permeability film is supplied to the vacuum evaporation system and 5 × 10 ^-5 Torr
Under vacuum of 10kw by electron beam heating method
And SiO ₂ are heated and evaporated to obtain a vapor-deposited film in which a transparent thin film of SiOx having a thickness of 52 nm is formed on the side having the coating film of the film. Next, a urethane adhesive (a two-component adhesive prepared by Dainippon Ink and Chemicals, Inc., a two-component adhesive in which Dick Dry LX-703A and KR-90 were mixed at a ratio of 15: 1) was applied to the vapor-deposited surface of this film in a thickness of 3 μm. rear,
A low-density polyethylene film (V-1 made by Tama Poly) having a thickness of 50 μm is attached by a dry lamination method. The oxygen permeability at 25 ° C. of the obtained film is measured using a gas permeability measuring device (MC-1 type manufactured by Toyo Seiki Co., Ltd.) according to JIS K-7126. Further, the oxygen permeability after subjecting this processed film to a retort treatment (120 ° C. × 30 minutes) is similarly measured.

Example 1 Dimethyl terephthalate and ethylene glycol were transesterified using manganese acetate as a transesterification catalyst, germanium oxide as a polymerization catalyst and phosphorous acid as a stabilizer, and as a lubricant after completion of the reaction. A porous silica particle having an average particle diameter of 0.8 μm, which is an agglomerated particle, was added to the polymer so as to be 800 ppm and polymerized by a conventional method to obtain an intrinsic viscosity (orthochlorophenol, 35 ° C.) of 0.65 dl / g. Polyethylene terephthalate (Tg: 78 ° C) was obtained.

The polyethylene terephthalate pellets were dried at 170 ° C. for 3 hours and then melted in an extruder at a melting temperature of 29.
It was melted at 5 ° C., filtered with a non-woven fabric type filter, and extruded from a slit die onto a rotary cooling drum having a surface temperature of 20 ° C. to obtain an unstretched film. Subsequently, this unstretched film was preheated to 75 ° C., heated between a low-speed roller and a high-speed roller to stretch 3.6 times in the longitudinal direction, and rapidly cooled, and then a 1.5% by weight aqueous solution having the following solid content composition was used. The coating liquid was applied to one side of the above film with a roll coater.

<Solid Content Composition of Aqueous Coating Solution> (I) Acrylic-polyester resin 90% by weight: The polyester resin component as the trunk polymer is terephthalic acid (18 mol%) / isophthalic acid (70 mol%) / 5- Sodium sulfoisophthalic acid (12 mol%) / ethylene glycol (92 mol%) / diethylene glycol (8
Acrylic resin component as a branch polymer is methyl methacrylate (80 mol%) / glycidyl methacrylate (15 mol%) / n-butyl acrylate (5 mol%), and a polyester resin component and an acrylic resin component. Copolymer (II) inactive particles having a molar ratio of 3: 7 5% by weight: silica fine particles (III) surfactant having an average particle size of 80 nm 5% by weight: polyoxyethylene alkyl ether It was supplied to a stenter and stretched 3.7 times in the transverse direction at 120 ° C. The obtained biaxially stretched film is 23
It was heat-set at a temperature of 5 ° C. for 5 seconds, relaxed by 1.5% during this period, and when the film temperature dropped to around 100 ° C., it was cut off from the holding tool to obtain a laminated polyester film. The film thickness of the coating film after drying was 0.02 μm. Table 1 shows the evaluation results of the obtained film.

[Example 2] A film was coated on one side of the film with a roll coater in the same manner as in Example 1 except that the solid components of the coating liquid were as follows. <Solid Content Composition of Aqueous Coating Liquid> (I) Acrylic-polyester resin 77% by weight: easy-to-use polyester resin as a trunk polymer contains terephthalic acid (18 mol%) / isophthalic acid (70 mol%) / 5-
It consists of sodium sulfoisophthalic acid (12 mol%) / ethylene glycol (92 mol%) / diethylene glycol (8 mol%), and the acrylic resin component as a branch polymer is methyl methacrylate (80 mol%) / glycidyl methacrylate (15 mol%). ) / N-Butyl acrylate (5 mol%) and the ratio of polyester resin component to acrylic resin component is 5: 5 in molar ratio Graft copolymer (II) Inactive particles 18% by weight: average particle size 30 nm 5% by weight of crosslinked acrylic fine particles (III) surfactant: polyoxyethylene alkyl ether Table 1 shows the evaluation results of the obtained film.

Example 3 A film was coated on one side of the film with a roll coater in the same manner as in Example 1 except that the solid components of the coating liquid were as follows. <Solid content composition of aqueous coating liquid> (I) Acrylic-polyester resin 94% by weight: The polyester resin component as a trunk polymer is terephthalic acid (18 mol%) / isophthalic acid (70 mol%) / 5-sodium sulfoisophthalate Acid (12 mol%) / ethylene glycol (92 mol%) / diethylene glycol (8
Acrylic resin component as a branch polymer is methyl methacrylate (80 mol%) / glycidyl methacrylate (15 mol%) / n-butyl acrylate (5 mol%), and a polyester resin component and an acrylic resin component. Copolymer (II) inactive particles having a ratio of 1: 9 1% by weight: silica fine particles (III) surfactant having an average particle size of 80 nm 5% by weight: polyoxyethylene alkyl ether Evaluation of the obtained film The results are shown in Table 1.

Comparative Example 1 A roll coater was applied to one side of a film in the same manner as in Example 1 except that the solid components of the coating liquid were as follows. <Solid content composition of aqueous coating liquid> (I) Acrylic-polyester resin 94% by weight: The polyester resin component as a trunk polymer is terephthalic acid (18 mol%) / isophthalic acid (70 mol%) / 5-sodium sulfoisophthalate Acid (12 mol%) / ethylene glycol (92 mol%) / diethylene glycol (8
Acrylic resin component as a branch polymer is methyl methacrylate (80 mol%) / glycidyl methacrylate (15 mol%) / n-butyl acrylate (5 mol%), and a polyester resin component and an acrylic resin component. Copolymer (II) with a ratio of 3: 7: 0.5% by weight of inert particles: 100n average particle size
m Silica fine particles (III) surfactant 5.5 wt%: polyoxyethylene alkyl ether Table 1 shows the evaluation results of the obtained film.

Comparative Example 2 A film was coated on one side of the film with a roll coater in the same manner as in Example 1 except that the solid components of the coating liquid were as follows. <Solid Content Composition of Aqueous Coating Liquid> (I) Acrylic-polyester resin 80% by weight: a polyester resin component as a trunk polymer is terephthalic acid (18 mol%) / isophthalic acid (70 mol%) / 5-sodium sulfoisophthalate Acid (12 mol%) / ethylene glycol (92 mol%) / diethylene glycol (8
Acrylic resin component as a branch polymer is methyl methacrylate (80 mol%) / glycidyl methacrylate (15 mol%) / n-butyl acrylate (5 mol%), and a polyester resin component and an acrylic resin component. Copolymer (II) having a ratio of 3: 7: 15% by weight of inert particles: 120 nm average particle size
5% by weight of silica fine particles (III) surfactant: polyoxyethylene alkyl ether Table 1 shows the evaluation results of the obtained film.

Comparative Example 3 A film was coated on one side of the film with a roll coater in the same manner as in Example 1 except that the solid components of the coating liquid were as follows. <Solid Content Composition of Aqueous Coating Liquid> (I) Acrylic-polyester resin 75% by weight: The polyester resin component as a trunk polymer is terephthalic acid (18 mol%) / isophthalic acid (70 mol%) / 5-sodium sulfoisophthalate Acid (12 mol%) / ethylene glycol (92 mol%) / diethylene glycol (8
Acrylic resin component as a branch polymer is methyl methacrylate (80 mol%) / glycidyl methacrylate (15 mol%) / n-butyl acrylate (5 mol%), and a polyester resin component and an acrylic resin component. Copolymer (II) inert particles having a ratio of 3: 7 20% by weight: silica fine particles (III) surfactant having an average particle size of 15 nm 5% by weight: polyoxyethylene alkyl ether Evaluation of the obtained film The results are shown in Table 1.

Comparative Example 4 A film was coated on one side of the film with a roll coater in the same manner as in Example 1 except that the solid components of the coating liquid were as follows. <Solid Content Composition of Aqueous Coating Liquid> (I) Acrylic-polyester resin 70% by weight: Polyester resin component as a trunk polymer is terephthalic acid (18 mol%) / isophthalic acid (70 mol%) / 5-sodium sulfoisophthalate Acid (12 mol%) / ethylene glycol (92 mol%) / diethylene glycol (8
Acrylic resin component as a branch polymer is methyl methacrylate (80 mol%) / glycidyl methacrylate (15 mol%) / n-butyl acrylate (5 mol%), and a polyester resin component and an acrylic resin component. Copolymer (II) inert particles having a ratio of 3: 7 25% by weight: Silica fine particles (III) surfactant having an average particle size of 80 nm 5% by weight: polyoxyethylene alkyl ether Evaluation of the obtained film The results are shown in Table 1.

[Comparative Example 5] In Example 1, a biaxially stretched polyester film was obtained by directly stretching the uniaxially stretched polyester film in the transverse direction without applying the aqueous coating liquid. Table 1 shows the evaluation results of the obtained film.

[0054]

[Table 1]

[0055]

EFFECTS OF THE INVENTION According to the present invention, it is excellent in oligomer encapsulation property, metal oxide adhesion property, and abrasion resistance, and further has excellent gas barrier property after metal oxide deposition, especially for packaging which requires gas barrier property. A laminated polyester film useful for the material can be provided.

Front page continuation (51) Int.Cl. ⁷ Identification code FI theme code (reference) C09D 133/00 C09D 133/00 133/10 133/10 133/14 133/14 167/00 167/00 // C08L 67 : 00 C08L 67:00 (72) Inventor Shunsuke Okuyama 3-37-19 Oyama, Sagamihara-shi, Kanagawa Teijin DuPont Films Co., Ltd. Sagamihara Research Center (72) Inventor Koji Furuya 3-chome, Oyama, Sagamihara-shi, Kanagawa No. 19 Teijin DuPont Films Co., Ltd. Sagamihara Research Center F-term (reference) 3E086 BA04 BA15 BA33 BA35 BB02 BB05 CA01 CA28 DA06 4F006 AA35 AB13 AB16 AB19 AB33 AB35 AB38 AB39 AB43 AB52 AB72 AB74 AB75 AB76 BA01 BA02 CA07 DA04 4F100 AA20 AA29A AK25B AK41A AK41B AK42 AK53B BA02 BA07 CA23B CC01B DD01B EH46B GB15 JD02 JL11 YY00B 4J038 CB022 CC002 CG002 CG141 CP121 CQ001 DA002 DB002 DD051 HA08 NA26 GA20 GA08 HA08 GA02 GA08 HA08 GA02 GA13 HA04 GA02 GA03 GA06 GA07 GA07 GA06 GA07 GA06 GA07 GA02 GA03 GA06 GA07 GA0

Claims (4)

[Claims] 1. A coating liquid containing, on at least one surface of a polyester film, a binder resin made of an acrylic-polyester resin and 1 to 20% by weight of inactive particles having an average particle diameter of 20 to 100 nm based on the total solid content. A laminated polyester film for packaging, which is provided with a coating film formed by applying, drying and stretching. 2. The acrylic-polyester resin has a molar ratio of polyester resin component / acrylic resin component of 1/9 or more and 5/5 or less, wherein the acrylic resin component is 50 mol% or more and 95 mol% or less of an alkyl methacrylate component, and epoxy. Containing acrylic monomer component 3 mol% or more 30 mol%
The laminated polyester film for packaging according to claim 1, which is a resin component whose main component is the following component and an alkyl acrylate component of 3 mol% or more and 30 mol% or less. 3. The center line average roughness (R
The laminated polyester film for packaging according to claim 1 or 2, wherein a) is 1 nm or more and less than 20 nm. 4. The laminated polyester film for packaging according to claim 1, wherein the amount of antimony in the film is 10 mmol% or less based on all acid components.