JPH06116486A - Copolyester composition and film for bonding sheet metal - Google Patents

Abstract

PURPOSE:To obtain a copolyester composition excellent in flavor retention, adaptability to can manufacture, and heat and impact resistances by mixing a copolyester with a polyoxyalkylene glycol component, elemental germanium and inorganic or organic particles in a specified mixing ratio. CONSTITUTION:The composition is obtained by mixing a copolyester composition mainly consisting of an aromatic dicarboxylic acid and a glycol with 0.05-20wt.%, based on the above composition, polyoxyalkylene glycol component, 1.0-500ppm of elemental germanium, and 0.01-5wt.% inorganic and/or organic particles of a mean particle diameter of 0.01-10mum. This composition is excellent in adaptability to can manufacture, flavor retention, and heat and impact resistances, especially in adaptability to can manufacture and flavor retention, and can be desirably used for a metallic can produced by molding.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a copolyester composition and a film for laminating metal plates.
More specifically, can-making properties, flavor properties, heat resistance, impact resistance,
In particular, the present invention relates to a copolymerized polyester composition and a film for laminating metal plates, which are excellent in can-making properties and flavor properties and suitable for metal cans produced by molding.

[0002]

2. Description of the Related Art Conventionally, a thermosetting resin has been coated on the inner and outer surfaces of a metal can for the purpose of preventing corrosion. However, the coating of such a thermosetting resin has problems that it takes a long time to dry the coating composition, productivity is deteriorated, and a large amount of the organic solvent is scattered, which is not preferable in terms of environmental hygiene.

As a method of solving these problems, a method of laminating a polyester film on a metal plate is performed. When a metal plate laminated with a polyester film is molded into a metal can, the polyester film is required to have the following characteristics. Metal cans are drawn,
Manufactured by a molding method called ironing, the polyester film laminated on the metal plate does not crack or break during molding (moldability). The laminated polyester film should not be crystallized or deteriorated by heating such as drying after can making, printing baking, retort sterilization treatment, etc. to prevent peeling, shrinkage, cracks, pinholes, etc. of the film (heat resistance). The polyester film should not be peeled off or cracked by impact on the metal can (impact resistance). The scent component of the contents of the can is adsorbed on the polyester film, or the odor of the polyester film does not impair the flavor of the contents (flavor). There has been an eager desire to develop a polyester film that comprehensively satisfies the various required characteristics as described above. With regard to formability in particular, in the current drawing and ironing processes, cans are made at high speed with dies and punches. At this time, the film is temporarily heated to about 200 ° C,
Adhesion of film to dies and punches, breakage of film,
Since peeling does not occur and cans are produced at high speed, slipperiness is also required. There is a demand for development of a film that can sufficiently cope with such a severe can manufacturing process, and in response to this demand, for example, in JP-A-61-20736, a steel sheet is laminated with a polyester film via an adhesive. A method has been proposed. However, this method is effective for preventing breakage and peeling of the film, but it takes a long time to cure the adhesive and productivity is deteriorated, and the flexibility of the film is reduced, and thus drawing and ironing processes are performed. There was a problem that followability deteriorates.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, and to improve can-making property, flavor property, heat resistance, impact resistance, especially can-making property and flavor property. Another object of the present invention is to provide a copolyester composition and a film for laminating metal plates, which can be improved at the same time.

[0005]

DISCLOSURE OF THE INVENTION The above-mentioned object of the present invention is to provide a composition of a copolyester having an aromatic dicarboxylic acid and a glycol as main components, in which the polyoxyalkylene glycol component is not added to the composition. .0
5-20% by weight, germanium element 1.0-500 p
It can be achieved by a copolymerized polyester composition and a film for laminating metal plates, which comprises pm and 0.01 to 5% by weight of inorganic and / or organic particles having an average particle size of 0.01 to 10 μm. .

The copolyester composition in the present invention means a polyester comprising an aromatic dicarboxylic acid component and a glycol component, an aromatic dicarboxylic acid component constituting the polyester, a dicarboxylic acid component other than the glycol component and / or a glycol component. It means a polyester copolymerized with. Examples of the polyester copolymerized with the dicarboxylic acid component and / or the glycol component include conventionally known polyesters such as polyethylene terephthalate, polybutylene terephthalate, polyhexamethylene terephthalate, polycyclohexylene dimethylene terephthalate and polyethylene naphthalate. Of these, polyethylene terephthalate and polyethylene naphthalate are particularly preferable.

The dicarboxylic acid component and / or glycol component which is copolymerized with the above-mentioned polyester is, for example, terephthalic acid, isophthalic acid, naphthalenedicarboxylic acid, diphenyldicarboxylic acid, diphenylsulfonedicarboxylic acid, diphenoxyethanedicarboxylic acid. , Diphenyl ether dicarboxylic acid, 5-sulfoisophthalic acid, aromatic dicarboxylic acid such as phthalic acid, oxalic acid, succinic acid, adipic acid, sebacic acid, dimer acid, maleic acid, fumaric acid and other aliphatic dicarboxylic acids, cyclohexanedicarboxylic acid Alicyclic dicarboxylic acid and the like. Of these dicarboxylic acid components, isophthalic acid and naphthalenedicarboxylic acid are particularly preferable. These dicarboxylic acid components may be alkyl esters or the like. Examples of the glycol component include ethylene glycol, propanediol, butanediol,
Examples thereof include aliphatic glycols such as pentanediol, hexanediol and neopentyl glycol, aromatic glycols such as bisphenol A and bisphenol S, and alicyclic glycols such as cyclohexanedimethanol. Neopentyl glycol among these glycol components,
Cyclohexanedimethanol is preferred. Even if only one of the above dicarboxylic acid component and glycol component is used,
You may use together 1 or more types. The copolymerization amount is 1.0 to the total acid component and / or total glycol component of polyester.
30 mol% is preferable, and more preferably 5.0 to 20.
mol%, particularly preferably 7.0 to 15 mol%. If the copolymerization amount is less than 1.0 mol%, the polyester is likely to be crystallized, resulting in poor impact resistance, and 30 mol%
If it exceeds, the melting point of the polyester becomes low and the heat resistance is poor. In addition, a polyfunctional compound such as trimellitic acid, trimesic acid, and trimethylolpropane, and an oxycarboxylic acid such as p-oxybenzoic acid are copolymerized with the copolymerized polyester composition unless the effects of the present invention are impaired. Good.

The copolymerized polyester composition in the present invention contains a polyoxyalkylene glycol component in an amount of 0.05 to 2
It is necessary to contain 0% by weight, preferably 0.1
10 to 10% by weight, more preferably 0.3 to 5% by weight. If the polyoxyalkylene glycol component is less than 0.05% by weight, the effect of improving the flavor property is not sufficient,
If it exceeds 20% by weight, the melting point becomes low and the heat resistance becomes poor. The method of incorporating the polyoxyalkylene glycol component into the polyester is not particularly limited, and any conventionally known method can be adopted. Examples of such a method include a method of adding a polyoxyalkylene glycol compound at an arbitrary stage before the completion of the polycondensation reaction, a method of mixing the polyoxyalkylene glycol compound with an acid component and / or a glycol component as a starting material of polyester, and the like. Is mentioned. The polyoxyalkylene glycol compound is not particularly limited, but a compound having a number average molecular weight of 4000 or less is preferable, and a compound having a number average molecular weight of 1000 or less is preferable from the viewpoint of improving the flavor property. Examples of such compounds include diethylene glycol, triethylene glycol, tetraethylene glycol, polyethylene glycol and polytetramethylene glycol. Of these, diethylene glycol is particularly preferable. The polyoxyalkylene glycol component in the present invention usually contains a diethylene glycol component that is a by-product during the production of a polyester containing ethylene glycol as the glycol component.

The copolymerized polyester composition of the present invention must contain germanium element in an amount of 1.0 to 500 ppm, preferably 5.0 to 300 ppm, and more preferably 10 to 100 ppm. If it is less than 1.0 ppm, the effect of improving the flavor property is not sufficient, and 50
If it exceeds 0 ppm, foreign matter is generated in the copolyester composition and becomes a crystal nucleating agent to easily crystallize, so that impact resistance is deteriorated, heat resistance is lowered, and coloring of the polyester is increased. The copolyester composition of the present invention can improve the flavor property by including the above-mentioned specific amount of germanium element in the polyester. The method of incorporating the germanium element into the polyester is not particularly limited and may be any conventionally known method, but usually, at any stage before the production of the polyester is completed, it is possible to add a germanium compound as a polymerization catalyst. preferable. Examples of such a method include a method in which a powder of a germanium compound is added as it is, or, as described in JP-B-54-22234, a germanium compound in a glycol component which is a starting material of a copolyester. And the like. Examples of the germanium compound include germanium dioxide,
Crystal water-containing germanium hydroxide, or germanium tetramethoxide, germanium tetraethoxide, germanium tetrabutoxide, germanium alkoxide compounds such as germanium ethyleneglycoxide, germanium phenolate, germanium phenoxide compounds such as germanium β-naphtholate, germanium phosphate, Examples thereof include phosphorus-containing germanium compounds such as germanium phosphite and germanium acetate.

The copolymerized polyester composition of the present invention must contain 0.01 to 5.0% by weight of inorganic and / or organic particles having an average particle diameter of 0.01 to 10 μm.
A preferable average particle diameter is 0.05 to 5.0 μm, and a preferable content is 0.05 to 3.0% by weight. By setting the average particle diameter and the content within the above ranges, it becomes possible to greatly improve the can making property. Any conventionally known inorganic and / or organic particles can be used. Examples of such particles include dry silica, colloidal silica, calcium carbonate, kaolin, talc, magnesium carbonate,
Examples thereof include barium carbonate, calcium sulfate, aluminum oxide, zirconium oxide, titanium oxide, lithium fluoride, carbon black and crosslinked polystyrene particles. Of these particles, dry silica, colloidal silica, calcium carbonate, titanium oxide and crosslinked polystyrene particles are particularly preferable. These particles may be used alone or in combination of two or more. It is also possible to use so-called internal particles in which the catalyst metal is deposited during the production of the copolyester composition. Further, the shape of the particles may be spherical, lumpy, flat, etc., and hardness, specific surface area, specific gravity, etc. may also be arbitrary.

As a method of blending the above-mentioned particles with polyester, for example, a method of dispersing the particles into a glycol component which is a starting material of polyester to form a slurry and adding it at an arbitrary stage before the completion of the production of polyester,
Alternatively, a method in which the particles are directly kneaded into a molten polymer by an extruder or the like can be used.

The melting point of the copolymerized polyester composition of the present invention is preferably 150 ° C. or higher from the viewpoint of showing heat resistance that can withstand heat treatment such as drying in a can making process and printing and baking. In order to obtain a film having proper properties and excellent impact resistance, it is preferably 250 ° C or lower. A more preferable melting point range is 170 ° C to 240 ° C, and a particularly preferable range is 180 ° C to 230 ° C.

The intrinsic viscosity of the copolyester composition in the present invention is preferably 0.50 dl / g or more in that the strength and crystallization of the polyester film are unlikely to occur and breakage and cracks do not occur during molding of a metal can. ,
Further, it is easy to stretch in the film forming process.
It is preferably 0 dl / g or less. A more preferable range of the intrinsic viscosity is 0.55 to 1.5 dl / g, and a particularly preferable range is 0.60 to 1.0 dl / g.

In producing the copolymerized polyester composition of the present invention, any conventionally known method can be adopted and it is not particularly limited. As an example, a case will be described where an isophthalic acid component is copolymerized with polyethylene terephthalate, and diethylene glycol as a polyoxyalkylene glycol component, germanium dioxide as a germanium compound, and colloidal silica as particles are added. Transesterification is carried out while distilling methanol out of the reaction system in the presence of a catalyst, such as dimethyl terephthalate, dimethyl isophthalate, ethylene glycol and diethylene glycol. Then, ethylene glycol slurry of colloidal silica and germanium dioxide are added, and ethylene glycol is distilled out of the reaction system at high temperature under reduced pressure to carry out a polycondensation reaction to obtain a copolyester composition. In addition, terephthalic acid, isophthalic acid,
It is also possible to employ a method in which an esterification reaction is carried out using ethylene glycol or diethylene glycol, and subsequently an ethylene glycol slurry of colloidal silica and germanium dioxide are added to carry out a polycondensation reaction. Also,
Solid-state polymerization method in which polycondensation is carried out until a certain degree of polymerization is obtained after transesterification or esterification reaction, and then the resulting low polymer is further polycondensed at a temperature lower than its melting point under reduced pressure or an inert gas stream. May be used.

In producing the copolyester composition of the present invention, conventionally known reaction catalysts and anti-coloring agents can be used. Examples of the reaction catalysts include alkaline earth metal compounds, zinc compounds and lead compounds. Examples of the coloring preventing agent include manganese compounds, cobalt compounds, aluminum compounds, antimony compounds, titanium compounds, and the like, and phosphorus compounds can be given as examples. Further, in producing the copolymerized polyester composition of the present invention, additives such as an antioxidant, a plasticizer, an antistatic agent, a weather resistance agent, a terminal blocking agent and the like can be appropriately used if necessary.

The film made of the copolyester composition in the present invention may be an unstretched sheet or a uniaxially or biaxially stretched film. The copolyester film of the present invention can be formed by any conventionally known method. For example, in the case of a biaxially stretched film, the copolymerized polyester composition described above is sufficiently dried and then supplied to an extruder, and melt-extruded onto a casting drum to obtain an unstretched film, and then this unstretched film is simultaneously or sequentially formed. The method of biaxial stretching is mentioned. Further, in the case of sequential biaxial stretching, the stretching order is such that the film is oriented in the longitudinal direction and in the width direction,
Alternatively, the reverse is also possible. Further, in the sequential biaxial stretching, it is possible to perform stretching in the longitudinal direction or the width direction twice or more. The stretching ratio in the longitudinal direction and width direction of the film can be arbitrarily set according to the degree of orientation, strength, elastic modulus, etc. of the target film, but preferably 2.
It is 5 to 5.0 times. Either the stretching ratio in the longitudinal direction or the stretching ratio in the width direction may be increased or may be the same. The stretching temperature may be any temperature in the range of not less than the glass transition temperature of polyester and not more than the crystallization temperature, but it is usually preferably 80 to 150 ° C. Further, the film can be heat-treated after the biaxial stretching. This heat treatment can be performed by any conventionally known method such as in an oven or on a heated roll. The heat treatment temperature can be any temperature above the crystallization temperature of the polyester and below the softening point, but it is preferably 120 to 240 ° C. The heat treatment time may be arbitrary, but is usually 1 to 60.
It is preferable to carry out for 2 seconds. The heat treatment may be performed while relaxing the film in the longitudinal direction and / or the width direction.

The thickness of the copolyester film of the present invention is not particularly limited, but considering the laminating property on a metal plate and the can-making property of a metal can, it is preferably 5 to 100 μm, more preferably 10 to 80 μm, especially Preferably 1
It is 5 to 50 μm.

The copolymerized polyester film in the present invention may be a laminated film composed of the same kind or two or more kinds of polyester.

[0019]

The present invention will be described in detail with reference to the following examples. The properties of polyester and film were measured and evaluated by the following methods.

(1) Content of polyoxyalkylene glycol component in polyester It was quantified by 13 C-NMR measurement.

(2) Content of Germanium Element in Polyester The amount of germanium element and the fluorescent X-ray intensity calibration curve were determined by fluorescent X-ray measurement.

(3) Average Particle Size of Particles A polyester chip containing particles is cut to a thickness of 0.2 μm, and the particles in polyester are observed using a transmission electron microscope. The area average particle diameter was obtained by observing 1000 particles.

(4) Intrinsic viscosity of polyester Dissolve polyester in orthochlorophenol,
It was measured at ° C.

(5) Melting point of polyester Crystallize polyester chips at 140 ° C. for 30 minutes,
Differential scanning calorimeter (DSC-2 manufactured by Perkin Elmer Co., Ltd.
It was measured at a temperature rising rate of 16 ° C./min.

(6) Flavor of Polyester Film A polyester film cut into a size of 15 cm × 15 cm was added to a perfume aqueous solution (d-limonene 20 ppm aqueous solution) to give 5 pieces.
The film was soaked for a day, and then the film was heat treated at 80 ° C. for 30 minutes, and the adsorbed amount of d-limonene per 1 g of the film was quantified by gas chromatography to evaluate the flavor property of the film.

(7) Can-making property A tin-plated steel sheet having a polyester film laminated on both sides was cut into a circle having a diameter of 150 mm and deep-drawn using a drawing die and a punch to form a metal can. Regarding this metal can, the state of the laminated polyester film was observed, and the can making properties of the metal can were evaluated according to the following criteria, and grade 2 or higher was passed. Grade 1 ... No breaks, cracks, or pinholes in the film inside and outside the can. 2nd grade: Breakage, cracks, and pinholes slightly occur on the film inside and outside the can. Class 3: Breakage, cracks, and pinholes occur considerably on the film inside and outside the can.

(8) Heat Resistance of Polyester Film A molded metal can was heated at 210 ° C. for 5 minutes, the state of the laminated film was observed, and the heat resistance was evaluated according to the following criteria, and grade 2 or higher was passed. 1st grade: No peeling or shrinkage of the film. Grade 2: Peeling and shrinkage occur slightly on the film. Grade 3: Peeling and shrinkage of the film occur. 4th grade: Film peeling and shrinkage are remarkable.

(9) Impact resistance of polyester film A molded metal can was filled with water and dropped from a height of 1 m onto marble. An energization test (ERV test) was performed on the 10 metal cans, and impact resistance was evaluated according to the following criteria, and grade 2 or higher was passed. The energization test is to fill a dropped metal can with a 1% sodium chloride solution,
This is a test for measuring the value of current flowing when a voltage of 6 V is applied to an electrode and a metal can provided in an aqueous solution. Class 1 ... 9 or more with a current value of 0.2 mA or less. Class 2 ... 7 to 8 with a current value of 0.2 mA or less. Class 3 ... Less than 7 with a current value of 0.2 mA or less.

Example 1 132 parts by weight of dimethyl terephthalate, 18 parts by weight of dimethyl isophthalate (12 m with respect to the acid component of polyester)
ol%), 96 parts by weight of ethylene glycol, 3.0 parts by weight of diethylene glycol, and 0.05 parts by weight of manganese acetate are charged into a flask equipped with a rectification column and a distillation condenser.
The mixture was heated to 150 to 235 ° C. with stirring to distill off methanol to carry out a transesterification reaction. After distilling out almost the theoretical amount of methanol, 0.18 part by weight of ethylene glycol slurry of colloidal silica having an average particle size of 1.5 μm, 0.03 part by weight of trimethyl phosphate, and 0.2 g of germanium dioxide.
04 parts by weight were added and the reaction mass was transferred to a reactor equipped with a distillation condenser. Then, the pressure inside the reactor was gradually reduced to 0.5 mmHg while stirring, and the temperature was raised to 290 ° C. to carry out a polycondensation reaction. As shown in Table 1, the copolymerized polyester composition obtained had an amount of diethylene glycol component of 2.5 wt%, an amount of germanium element of 50 ppm, an intrinsic viscosity of 0.70 dl / g, a melting point of 225 ° C., and a colloidal silica content. The amount was 0.12 wt%. After drying this polyester chip, it was melt extruded onto a casting drum using an extruder to obtain an unstretched film. This unstretched film was stretched in the longitudinal direction at 90 ° C.
The film was stretched 5 times and then 3.5 times in the width direction at 105 ° C.
Further, this biaxially stretched film was heat-treated at 190 ° C. under a constant length to obtain a polyester film having a thickness of 25 μm. Can-making properties of metal plates with this polyester film attached,
Table 2 shows the evaluation results of the flavor, heat resistance and impact resistance of the film. As is clear from these results, it has excellent can-making property, flavor property, heat resistance, and impact resistance.

Example 2 A polymer was produced in the same manner as in Example 1 without adding diethylene glycol, and a biaxially stretched film was formed. The properties of this polymer are shown in Table 1, and the can evaluation properties and film property evaluation results are shown in Table 2. As is clear from these results, it had excellent can-making properties, flavor properties, heat resistance, and impact resistance.

Examples 3 to 5 amount of diethylene glycol, amount of germanium dioxide added,
A biaxially stretched film was produced by polymerizing a polymer in the same manner as in Example 1 except that the intrinsic viscosity, the added particles and the average particle size or the content thereof were changed. Table 1 shows the properties of these polymers, and Table 2 shows the results of evaluation of can-making properties and film properties.
As is clear from these results, it had excellent can-making properties, flavor properties, heat resistance, and impact resistance.

Example 6 Instead of diethylene glycol, the number average molecular weight was 100.
3.7 parts by weight of polyethylene glycol of No. 0 was added, and calcium carbonate having an average particle diameter of 1.5 μm was added as 0.1 particles.
A polymer was polymerized in the same manner as in Example 1 except that 8 parts by weight was added to produce a biaxially stretched film. When the obtained polymer was analyzed, it was confirmed that the polyethylene glycol component was 2.
It contained 5 wt% and a diethylene glycol component of 1.5 wt%. When the characteristics of this film were evaluated, it had excellent can-making properties, flavor properties, heat resistance and impact resistance.

Example 7 Instead of dimethyl isophthalate as a copolymerization component, 1,
Polymer was polymerized in the same manner as in Example 1 except that 4-cyclohexanedimethanol (10 mol% based on all glycol components of polyester) and 0.74 parts by weight of titanium oxide having an average particle size of 1.0 μm were added as particles. , A biaxially stretched film was manufactured. The characteristics of this polymer are shown in Table 1, and the evaluation results of the characteristics of the film are shown in Table 2. As is clear from these results, it had excellent can-making properties, flavor properties, heat resistance, and impact resistance.

Comparative Example 1 A polymer was polymerized in the same manner as in Example 1 except that no particles were added to form a biaxially stretched film. The properties of this polymer are shown in Table 1, and the can evaluation properties and film property evaluation results are shown in Table 2. As a result, since it did not contain particles, it was inferior in can making property.

Comparative Example 2 Antimony trioxide was used in place of germanium dioxide in an amount of 0.
A polymer was polymerized in the same manner as in Example 1 except that 063 parts by weight was used and 10.4 parts by weight of colloidal silica having an average particle size of 0.005 μm was added to produce a biaxially stretched film. The properties of this polymer are shown in Table 1, and the can evaluation properties and film property evaluation results are shown in Table 2. As a result, the germanium element was not contained, and the average particle size and content were out of the range of the present invention, so that the can forming property and the flavor property were inferior.

Comparative Example 3 A polymer was polymerized in the same manner as in Example 1 except that 61 parts by weight of diethylene glycol and 60 parts by weight of ethylene glycol were used to produce a biaxially stretched film. The properties of this polymer are shown in Table 1, and the can evaluation properties and film property evaluation results are shown in Table 2. As a result, the contents of the polyoxyalkylene glycol component and germanium dioxide were out of the range of the present invention, so that the can forming property, the flavor property, the heat resistance and the impact resistance were poor.

Comparative Example 4 0.0007 parts by weight of germanium dioxide, 0.063 parts by weight of antimony trioxide, and an average particle size of 1.5 as particles.
A polymer was polymerized in the same manner as in Example 1 except that 0.18 part by weight of dry silica of μm was added to produce a biaxially stretched film. The properties of this polymer are shown in Table 1, and the can evaluation properties and film property evaluation results are shown in Table 2. As a result, the content of germanium was out of the range of the present invention, so that the flavor property and the impact resistance were poor.

Comparative Example 5 Polymer was polymerized in the same manner as in Example 1 except that 0.39 parts by weight of germanium dioxide and 0.18 parts by weight of dry silica having an average particle size of 1.5 μm as particles were added, and biaxially polymerized. A stretched film was produced. The properties of this polymer are shown in Table 1, and the can evaluation properties and film property evaluation results are shown in Table 2. As a result,
Since the content of the germanium element was out of the range of the present invention, it was inferior in flavor property, heat resistance and impact resistance.

Comparative Example 6 A polymer was polymerized in the same manner as in Example 1 except that dimethyl isophthalate was not copolymerized and 0.18 part by weight of calcium carbonate having an average particle size of 1.5 μm was added as particles. A stretched film was produced. The properties of this polymer are shown in Table 1, and the can evaluation properties and film property evaluation results are shown in Table 2. As is clear from this result, the flavor, impact resistance and heat resistance were poor because the copolymer did not contain a copolymerization component.

[0040]

[Table 1] The abbreviations in the table are as follows. PAG: polyoxyalkylene glycol Ge: germanium IPA: isophthalic acid DEG: diethylene glycol PEG: polyethylene glycol CHDM: 1,4-cyclohexanedimethanol

[Table 2]

[0041]

EFFECT OF THE INVENTION The copolyester composition and film for laminating metal plates of the present invention are excellent in can-making property, flavor property, heat resistance and impact resistance, especially in can-making property and flavor property, and are produced by molding. It is preferably used for metal cans.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI Technical display location C08G 63/672 NNH 7107-4J 63/85 NMV 7107-4J C08J 5/18 CFD 9267-4F C08K 3 / 00 KJQ 7242-4J 5/06 // (C08L 67/02 71:02)

Claims (4)

[Claims] 1. A composition of a copolyester having an aromatic dicarboxylic acid and glycol as main constituents, wherein the polyoxyalkylene glycol component is 0.05 to 20% by weight, and the germanium element is 1. 0
-500 ppm, 0.01-5 weight% of inorganic and / or organic particles having an average particle diameter of 0.01-10 m are contained, and a copolyester composition for laminating metal plates. 2. The copolyester composition for laminating metal plates according to claim 1, wherein the polyoxyalkylene glycol component is diethylene glycol. 3. The melting point of the copolyester composition is 150.
The copolyester composition for laminating metal plates according to claim 1, which has a temperature of ˜250 ° C. 3. 4. A film comprising the copolyester composition for laminating metal plates according to claim 1, 2 or 3.