JPH06859A - Method for manufacturing laminated film - Google Patents

Abstract

PURPOSE:To obtain a high-quality laminated film by a method wherein a polyester obtained by serially carrying out an esterification reaction and a polymerization reaction is not processed to chips but directly fed to at least one film production process to be coextruded as a laminate. CONSTITUTION:An esterification reactor 1 consists of three tanks serially arranged. In the first tank, reaction liquid of a polymerization degree of 2-3 is stagnated. A slurry of a mixture of terephtalic acid with ethylene glycol is continuously supplied to the first tank to initiate the esterification. This is fed into the second and third tanks to acceleratedly react to a preploymer. The polycondensation reaction of this prepolymer is carried out in a vacuum of high degree in a horizontal polymerization tank 2, whereby a polyethylene terephthalate is produced. The polymer thus obtained is fed into kneading extruders 4, 5 through a distributor 8 to be added with synthetic calcium carbonate particle, whereby a particle-containing polymer is obtained. This is filtered to obtain coating materials A, B, which are oriented into a high-quality film by a film production device 7.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a method for producing a laminated polyester film.

[0002]

2. Description of the Related Art Polyester films are widely used as industrial substrates because of their excellent physical and chemical properties. In particular, the biaxially oriented polyethylene terephthalate (PET) film is particularly excellent in mechanical strength, dimensional stability, flatness, etc., so that it is used as a base film for magnetic recording media, a thermal transfer substrate, a capacitor, an electrical insulator. For flexible printed circuit boards,
It is now indispensable for applications such as plate making, packaging, and labeling.

Although the film quality is designed in accordance with the demands in such various uses, the demand for lowering the film price has become particularly strong in recent years. Under such circumstances, in manufacturing a polyester film, it is required to reduce the cost without lowering the film quality at least. Particularly when used as a base material for a magnetic recording medium, fine particles having a specified particle size and content are contained in the film to adjust the surface roughness, slipperiness and the like within a suitable range. In addition, in order to prevent deterioration of electromagnetic conversion characteristics and characteristics such as dropout when used as a magnetic recording medium, it is important that the film does not contain large particles or foreign matters that form coarse protrusions on the surface. . It has been difficult to maintain such high film quality.

[0004]

Means for Solving the Problems As a result of intensive studies in view of the above circumstances, the present inventors have found that a laminated film having high film quality can be obtained by continuously carrying out polyester production and film production. The present invention has been completed and the present invention has been completed. That is, the gist of the present invention is characterized in that the polyester obtained by continuously performing the esterification reaction and the polymerization reaction is directly transferred to at least one film manufacturing step without chipping, and coextrusion lamination molding is performed. And a method for producing a laminated film.

The present invention will be described in detail below. The polyester referred to in the present invention is an aromatic dicarboxylic acid such as terephthalic acid or 2,6-naphthalenedicarboxylic acid, and an aliphatic glycol such as ethylene glycol, 1,4-butanediol or 1,4-cyclohexanedimethanol. It is a polymer obtained by polycondensing and. Typical examples of such polymers include polyethylene terephthalate (PET) and polyethylene 2,6-naphthalate (P
EN) and the like are exemplified. Further, these polymers may be homopolymers or copolymers containing a third component or some components. In this case, examples of the dicarboxylic acid component include isophthalic acid, phthalic acid,
Terephthalic acid, 2,6-naphthalenedicarboxylic acid, 4,
As the 4'-diphenyldicarboxylic acid, adipic acid, sebacic acid, decanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, and oxycarboxylic acid component, for example, p
Examples of the oxybenzoic acid and glycol component include ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, butanediol, neopentyl glycol, 1,4-cyclohexanedimethanol, polyethylene glycol and polytetramethylene glycol.

The intrinsic viscosity of the polyester used in the present invention is usually 0.45 to 1.0. Below 0.45,
Trouble such as breakage tends to occur during the production of the film, which may reduce the productivity or the mechanical strength of the film. On the other hand, if it exceeds 1.0,
Productivity during polyester production may decrease. A feature of the present invention is to introduce a polyester produced by continuous polymerization directly to a film production apparatus to produce a laminated film.

First, as a continuous polymerization method of polyester, a known method can be adopted. For example, by connecting a plurality of reaction tanks in series and adding a polymerization raw material and a polymerization catalyst, an auxiliary agent, an additive, fine particles, etc. at the initial stage or at any stage, the temperature, pressure and the moving speed of the reactants of the reaction tank are added. Etc. to obtain a polyester having a predetermined intrinsic viscosity and additive amount, or to adjust the temperature and pressure in one or more horizontal reaction tanks, or to combine a plurality of reaction tanks with one or more horizontal reaction tanks. Methods and the like.

The obtained polyester is directly introduced into a film production apparatus without being made into chips to produce a film. In the present invention, it is preferable that the film production apparatus has at least one kneader. The kneader referred to here is one capable of injecting and kneading a fine particle powder and / or a polymer containing fine particles into a polymer. As such a kneading machine, a uniaxial or biaxial kneading extruder of a thermoplastic resin is preferable, and fine powder or a polymer containing fine particles can be continuously or quantitatively added or injected at one or more locations in the kneading extrusion step. Is preferred.

Specifically, for example, a method of adding particle powder or polymer to a kneading extruder at one or more locations using a known quantitative feeder is used. It is most preferable to introduce a part of the polyester obtained by continuous polymerization into the kneading extruder and to add and knead the fine particle powder to obtain a raw material for the laminated film from the viewpoint of cost reduction. In addition, a method of adding a polymer containing fine particles with or without fine particle powder, or without introducing a polymer obtained by continuous polymerization, only a polymer containing fine particles in advance is melt extruded by a kneading extruder. It can also be used as a raw material for a laminated film.

Further, a method in which a vent port is provided at one or more places of the kneading extruder and the pressure is reduced or vacuumed is also preferably adopted. By this method, it is possible to suppress the decrease in the intrinsic viscosity of the polyester, to add fine particles as a slurry of water or an organic solvent, to enable the use of a polymer containing fine particles without a drying step, or It is possible to reduce the number of oligomers, which is preferable. The part for guiding the polymer may be a temperature-controlled conduit or an extruder with a screw.

A laminated film is usually produced from a polyester (A layer) containing fine particles and a polyester (B layer) obtained by continuous polymerization, which are prepared by the above kneading extruder or the like. That is, a laminated film of two layers or three layers or more is manufactured by using a well-known coextrusion laminating apparatus such as a feed block or a multi-manifold die in a state where each polyester is melted. Hereinafter, the laminated film of the A layer and the B layer will be described as an example of the present invention.

The thickness of each layer of the laminated film is usually adjusted by the amount of polymer discharged by a gear pump. Also,
From the viewpoint of film quality, it is preferable to filter each polymer with a filter before laminating. In this case, examples of the filter used include a non-woven fabric type filter made of stainless steel fine wire, sintered metal, glass fiber and the like. Further, the opening is preferably 60 μm or less, more preferably 40 μm or less, and particularly preferably 20 μm or less. In the case of producing for a magnetic recording medium base film, in order to prevent the generation of coarse projections on the film surface, the polymer mesh size of the outermost layer of the film is preferably 20 μm or less, more preferably 10 μm or less.

Examples of fine particles that can be used in the present invention include kaolin, talc, titanium dioxide, silicon dioxide, calcium carbonate, calcium phosphate, aluminum oxide, zeolite, lithium fluoride, barium sulfate, carbon black, and JP-B-59. Examples thereof include polymer particles described in JP-A-5216 and JP-A-59-217755.

In the present invention, the film surface is prevented from being scratched in the film manufacturing process, the running property is improved, the workability is improved when the film is processed, the productivity is improved, and the quality of the product after the film is processed is improved. Usually, the above fine particles are used for the purpose such as. The suitable particle size of the fine particles to be added and the range of the addition amount differ depending on each application of the film, but usually the average particle size of the fine particles is 0.01 to 5.0 μm,
It is preferably 0.1 to 3.0 μm, and the addition amount is preferably 0.005 to 20 with respect to the polymer containing particles.
%, More preferably 0.01 to 15% by weight, particularly preferably 0.05 to 10% by weight. Particularly when used for a magnetic recording medium base film, the average particle size is preferably 0.05 to 1.0 μm, and more preferably 0.1 to 1.0 μm.
It is 0.7 μm, and the addition amount is preferably 0.05 to 10% by weight. If the average particle size is less than 0.01 μm or the added amount is less than 0.005% by weight, the effect of improving running properties and winding properties tends to be insufficient, and if it exceeds 5.0 μm, the film surface Roughening is significant and the quality is significantly degraded. When the amount of particles added exceeds 20% by weight, the particles are not evenly dispersed in the polymer, agglomerated particles are generated to deteriorate the film quality, or the filter is clogged to deteriorate the productivity. Sometimes.

One kind of fine particles may be blended, or two or more kinds may be contained at the same time. Particularly for magnetic recording media, if the average particle size of the particles exceeds 1.0 μm or if the addition amount exceeds 10% by weight, the electromagnetic conversion characteristics may deteriorate. Further, in particular for a high density magnetic recording medium such as a metal powder type, since the height of the protrusions formed on the surface and the uniformity of the spread are highly required,
The particles to be contained also need to have a sharp particle size distribution. Specifically, the particle size distribution value shown below is preferably 1.90 or less, more preferably 1.60 or less, and particularly preferably 1.50 or less.

Particle size distribution value = d ₂₅ / d ₇₅ (In the formula, d ₂₅ / d ₇₅ is the equivalent spherical distribution in the particle size distribution of the particle group, and the integration (weight basis) is performed from the large particle side.
(Particle size (μm) corresponding to 5% and 75% is shown.) When the particle size distribution value exceeds 1.90, large particles are also mixed, so that large projections are easily formed and high electromagnetic change characteristics are obtained. I will not be able to.

In order to obtain particles having a small particle size distribution value, that is, a sharp particle size distribution, fine particles are produced by a method such as strengthening or optimizing the classification conditions in the pulverizing and classifying steps of the particles, or by a synthetic method. By doing so, there can be mentioned a method of obtaining a sharp particle size distribution or a monodisperse particle size distribution. Examples of monodisperse particles include monodisperse spherical silica particles, monodisperse spherical crosslinked polymer particles, and monodisperse calcium carbonate particles.

With respect to the film thickness constitution, the preferable range varies depending on the particle diameter of the fine particles contained, but from the viewpoint of productivity, it is not preferable to thicken the layer containing the particles (for example, the above-mentioned layer A), and it is usually preferable. The range is 0.1 to 20 μm, preferably 0.5 to 10 μm. Especially when it is used for a magnetic recording medium base film, the thickness of the layer A is usually 0.1 to
5 μm, preferably 0.3 to 3 μm.

On the other hand, the raw material for the layer B is usually produced as a clear polyester containing no fine particles and the like, but fine particles can be added at any stage of the polymerization step, if necessary. Examples of the fine particles include those similar to the case of the layer A. However, the addition amount is preferably 1% by weight or less. In this case, so-called precipitated particles can also be used. The term "precipitated particles" as used herein refers to particles that are precipitated in the reaction system by polymerizing using an alkali metal or alkaline earth metal compound as a catalyst. Further, it may be precipitated by adding terephthalic acid during the polymerization reaction. In these cases, one or more phosphorous compounds such as phosphoric acid, trimethyl phosphate, triethyl phosphate, tributyl phosphate, ethyl acid phosphate, phosphorous acid, trimethyl phosphite, triethyl phosphite, and tributyl phosphite are used. It may be allowed to exist.

In any case, one or more elements such as calcium, lithium, antimony and phosphorus are contained in the fine precipitation compound formed during the polyester forming reaction in the present invention. By including fine particles in the B layer,
The effect of preventing scratches on the film surface in the film manufacturing process and the processing process can be obtained.

Particularly when used as a base film for a magnetic recording medium, it is preferable to contain aluminum oxide in the A layer or both A and B layers in order to highly improve the scratch resistance of the film. The aluminum oxide particles used for this purpose have an average particle size of 0.5 μm or less,
Delta-type or gamma-type aluminum oxide particles having a size of 0.1 μm or less, particularly delta-type aluminum oxide particles are preferably used. As a method for producing these particles, for example, a thermal decomposition method, that is, a method of flame hydrolysis using anhydrous aluminum chloride as a raw material, or an ammonium alum thermal decomposition method, that is, using aluminum hydroxide as a starting material,
Examples thereof include a method of reacting with sulfuric acid to form aluminum sulfate, and then reacting with ammonium sulfate to burn ammonium alum.

The primary particle size of aluminum oxide obtained by these methods is usually in the range of 5 to 40 nm, but since agglomerates of more than 0.5 μm are often formed,
It is desirable to use it after appropriately crushing. In this case, the secondary particles may be agglomerated to some extent, but the apparent average particle diameter is preferably 0.5 μm or less, and more preferably 0.1 μm or less.

Next, the method for producing the film of the present invention will be described. The raw materials of the A layer and the B layer are laminated in a molten state by a feed block or a multi-manifold die, and a molten sheet of 2 or 3 layers is extruded from a die and cooled and solidified by a cooling roll to obtain an unstretched film. good. In this case, in order to improve the flatness of the sheet, it is necessary to enhance the adhesion between the sheet and the rotary cooling drum, and the electrostatic application adhesion method and / or the liquid coating adhesion method are preferably adopted in the present invention.

In the electrostatic application contact method, a linear electrode is usually placed on the upper surface of the sheet in a direction orthogonal to the flow of the sheet, and a DC voltage of about 5 to 10 kV is applied to the electrode to statically apply the sheet. This is a method of applying an electric charge to improve the adhesion to the drum. In addition, the liquid application contact method is a method for improving the adhesion between the drum and the sheet by uniformly applying the liquid to the whole or part of the surface of the rotary cooling drum (for example, only the portions that contact both ends of the sheet). Is. In the present invention, both may be used in combination as required.

The obtained unstretched film is usually stretched in at least a uniaxial direction, but from the viewpoints of mechanical strength, dimensional stability, etc., it is preferable to stretch in a biaxial direction for biaxial orientation. The unstretched sheet is preferably 70 to 15 in terms of the stretching conditions for biaxial stretching.
0 ° C, more preferably in the temperature range of 80-130 ° C,
First, it is stretched in one direction by a roll or tenter type stretching machine at 3.0 to 7 times, preferably 3.5 to 6 times.
Next, it is preferably 70 to 125 in the direction orthogonal to the first stage.
2. C., more preferably in the temperature range of 80 to 115.degree.
0 to 7 times, preferably 3.5 to 6 times stretching, 17
Heat treatment is performed at a temperature of 0 to 250 ° C. under a fixed length or under a limited shrinkage or extension of 30% or less. A biaxially oriented film is obtained.

A method in which unidirectional stretching is performed in two or more steps can be used, but in that case as well, it is desirable that the final stretching ratio falls within the above range. It is also possible to simultaneously biaxially stretch the unstretched sheet so that the area ratio becomes 10 to 40 times. Further, if necessary, it may be stretched again in the machine direction and / or the transverse direction before or after the heat treatment.

In the present invention, the film manufacturing apparatus is
It is desirable to provide two or more series in one continuous polymerization device. Since the continuous polymerization apparatus usually takes advantage of scale, the production amount is large and reaches several tens of tons / day or more. In order to stabilize the quality such as the intrinsic viscosity and the color of the polymer, it is preferable to keep the production rate constant. However, in the film production, it is difficult to always keep the polymer consumption constant because the polymer discharge amount and the production line speed are changed to control the film thickness and the like. Further, especially when producing a thin film having a thickness of about 10 μm or less, the polymer consumption is small,
It becomes difficult to efficiently consume the polymer produced by the continuous polymerization method. Therefore, in the present invention, in order to solve such a problem, one continuous polymerization apparatus,
It is preferable to provide two or more series of film manufacturing apparatuses. Further, at that time, it is important to simultaneously provide a series for manufacturing a thin film of about 25 μm or less in view of a kneading machine, a polymer discharge amount, a film forming facility, etc. and a series for manufacturing a thick film of about 400 μm. To more preferable.

In the present invention, it is preferable to simultaneously install a melt-extruding device for utilizing scrap portions such as film ears generated during film production as recycled raw materials. Such a regenerated polymer is preferably contained in the B layer of the laminated film, or may be formed as the C layer only with the regenerated polymer. In any case, it is desirable not to mix the recycled polymer in the A layer in order to keep the film quality high.

In the present invention, it is preferable to provide a device for cutting polyester into chips in addition to the film manufacturing device. In film production, the line speed is often greatly reduced or stopped, including when the film forming conditions are changed, the polymer filter is replaced, or when the film breaks. Even in such a case, since the production of the polymer is continued in the apparatus of the present invention, it is necessary to efficiently treat the surplus polymer. Even if there are a plurality of film production series, it is difficult to change the consumption amount of the raw material polymer during stable production, which is not preferable from the viewpoint of productivity. Therefore, it is desirable to adopt a method of providing a device for cutting the polyester into chips. Such a device is preferable in terms of productivity because the speed of the cutter can be easily adjusted even if the discharge amount of the polymer is changed.
Further, although the chip cutting devices are usually provided in parallel in two or more series, the change range of the ejection amount can be increased, although it depends on the capability.

Also in this chip manufacturing series, a kneading machine is provided in parallel with the flow path of the molten polymer, a part or all of the polymer is passed through the kneading machine, and the fine particles as exemplified above are added and kneaded. It is also preferable to disperse and produce polymer chips containing fine particles.

[0031]

EXAMPLES The present invention will be described in more detail with reference to examples below, but the present invention is not limited to the following examples unless it exceeds the gist thereof. The physical property measuring methods used in the present invention are as follows. In the examples, "part" and "%" mean "part by weight" and "% by weight", respectively.

(1) Intrinsic Viscosity ([η]) 1 g of polymer was added to phenol / tetrachloroethane = 50
Dissolve in 100 ml of 50/50 (weight ratio) mixed solvent,
It was measured at ° C.

(2) Average particle size (d ₅₀ ) and particle size distribution value (d ₂₅ / d ₇₅ ) of the fine particles Stokes using a centrifugal sedimentation type particle size distribution measuring device SA-CP3 manufactured by Shimadzu Corporation The particle size was measured by the sedimentation method based on the resistance law. The average particle size (d ₅₀ ) was obtained by using the value of 50% of the integrated (weight basis) in the measured spherical equivalent distribution of the particles. At the same time, the particle diameters corresponding to 25% and 75% added from the large particle side are d ₂₅ and d ₇₅ , respectively, and the particle size distribution value (d ₂₅ /
d ₇₅ ) was determined.

(3) Film Lamination Thickness The film cross section was observed with a transmission electron microscope (TEM). That is, a small piece of a film sample was embedded in a resin in which an epoxy resin was mixed with a curing agent and an accelerating agent, and a section having a thickness of about 200 nm was prepared with an ultramicrotome, and used as an observation sample. A micrograph of a cross section of the obtained sample was photographed with a transmission electron microscope H-900 manufactured by Hitachi Ltd., and the thickness of the layer A containing particles was measured. However, the acceleration voltage was set to 300 kV, and the magnification was set in the range of 10,000 to 100,000 times according to the thickness of the A layer. The thickness was measured at 50 points, 10 points from the thickest value and 10 points from the thinnest value were deleted, and 30 points were averaged to obtain the measured value. B
The thickness of the layer or the whole film was also measured by TEM, but when the thickness was more than 25 μm, a normal micrometer was used.

Example 1 A continuous polymerization apparatus capable of producing polyethylene terephthalate 40 [ton / day] was used. That is, three esterification reaction tanks were installed in series, a reaction solution having a degree of polymerization of 2 to 3 was previously retained in the first tank, and a slurry prepared by mixing terephthalic acid and ethylene glycol was continuously supplied. , Esterification reaction was performed. The reaction product was transferred to the second tank and the third tank by a transfer pump, and the reaction was further advanced to obtain a prepolymer. The prepolymer was subsequently subjected to a polycondensation reaction in a horizontal polymerization tank under a high degree of vacuum to continuously produce polyethylene terephthalate having an intrinsic viscosity of 0.640. The obtained polymer was excellent in transparency and polymer quality, and was sufficiently usable for film production. The obtained polymer was supplied to the film production apparatus (I), the film production apparatus (II) and the tip cutter line by a distributor.

(I) Film manufacturing apparatus (I) line 13% of the supplied polymer is fed to the kneading machine side by a distributor.
87% of the polymer was flowed to the gear pump side. The flow rate was adjusted with a gear pump. In a kneader, 0.8% of synthetic calcium carbonate particles having an average particle size of 0.3 μm and a particle size distribution value of 1.5 were added to the polymer. The obtained particle-containing polymer was passed through a stainless non-woven fabric type filter having an opening of 10 μm to obtain a raw material for layer A. on the other hand,
The raw material passed through a gear pump and a stainless non-woven fabric type filter having an opening of 20 μm was used as the B-layer raw material.

These polymers were combined and laminated in a feed block, and the surface temperature was adjusted to 40 by using the electrostatic application adhesion method.
It was cooled and solidified on a cooling roll set at 0 ° C. to obtain a laminated unstretched sheet having a layer structure of A / B / A. Then, the obtained sheet was stretched in the machine direction at a temperature of 85 ° C. by a factor of 3.7, subsequently guided to a tenter, stretched in the transverse direction at a temperature of 100 ° C. by a factor of 3.6, and further stretched in the longitudinal direction by a factor of 1.13. Then, heat treatment was performed at 225 ° C. to obtain a biaxially oriented laminated film having a thickness of 15 μm. A / B / A layer thickness is 1/13 / 1μ, respectively
It was m.

(Ii) Film manufacturing apparatus (II) line The supplied polymer was distributed to two kneaders by a distributor at a weight ratio of 8:92. In one kneader,
Silica particles having an average particle size of 1.3 μm were added to the polymer in an amount of 0.
After adding 1%, it was passed through a stainless non-woven fabric type filter having an opening of 20 μm to obtain a layer A raw material. In the other kneading machine, the self-regenerating raw material obtained from scraps such as the ears when the film was produced under the same conditions with the present apparatus was blended so that the ratio was 37% of the B layer raw material, The mixture was kneaded and passed through a filter having an opening of 20 μm to obtain a layer B raw material.

These polymers were combined and laminated in a feed block, and an A / B / A laminated unstretched sheet was obtained in the same manner as in the film manufacturing apparatus (I) line. Then, the obtained sheet was stretched in the longitudinal direction at 85 ° C. by a factor of 3.6, and subsequently stretched in the transverse direction at 120 ° C. by a factor of 4.0. Then, heat treatment was performed at 240 ° C. while performing a relaxation treatment at a relaxation rate of 10% in the width direction. The thickness of the obtained film was 75 μm, and the thickness of the A / B / A layer was 2 /
It was 71/2 μm.

(Iii) Chip cutter (C ₁ ) The supplied polymer was distributed by a distributor, and a kneading machine was used to mix titanium oxide particles having an average particle diameter of 0.3 μm with the particle-containing polymer and the above-mentioned polymer. The polymer supplied from the distributor was mixed with a Samogenizer to obtain a titanium oxide content of 15%.
Polymer chips were manufactured.

(Iv) Chip Cutter (C ₂ ) A transparent polymer after continuous polymerization was directly obtained as a chipping raw material. The film obtained by the film manufacturing apparatus (I) had a high degree of sliding running property and flatness, and was suitable for a high density magnetic recording medium base film. Further, the film obtained by the film production apparatus (II) simultaneously satisfied a high degree of transparency and slidability, and was suitable as a transparent conductive film, for plate making and the like.

In each film production line, the tip cutters C ₂ and C ₁ are used even when the polymer consumption changes due to the thickness adjustment and filter replacement work.
It was possible to easily cope with this by controlling the amount of chip raw material production (mainly in C ₂ ), to stabilize the amount of polymer production in the continuous polymerization device, and to keep the polymer quality constant.

Example 2 In the line of the film manufacturing apparatus (II) in Example 1,
The particles to be blended in the kneading machine are monodisperse spherical cross-linked polymer particles having an average particle size of 0.3 μm and a particle size distribution value of 1.4 as a main component, styrene and divinylbenzene, the addition amount is 1.0%, and the thickness is To produce a two-layer film with the A / B layers each having a thickness of 1/6 μm. The obtained film was used as a high-density magnetic recording film in which the height of A layer was uniform and small, a large number of protrusions were formed, the slipperiness was high, and the B layer was extremely flat and had different surfaces. It was suitable.

[0044]

According to the present invention, it is possible to produce a high quality polyester film with good productivity and at a low cost. Its applications include magnetic recording media, electrical insulators and capacitor dielectrics. , Flexible printed circuit boards, plate making, labels, packaging, matte films, heat sensitive stencil printing base papers, electrophotography, etc., and the industrial value of the present invention is great.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view of the present invention.

[Explanation of symbols]

 1 Esterification reaction tank 2 Continuous polymerization reaction tank 3 Chip cutter 4 Kneading extruder 5 Kneading extruder 6 Laminating die 7 Film manufacturing device 8 Distributor

Claims (1)

[Claims] 1. A laminate, characterized in that the polyester obtained by continuously performing an esterification reaction and a polymerization reaction is directly transferred to at least one film manufacturing process without being made into chips and subjected to coextrusion lamination molding. Film manufacturing method.