Biaxially stretched thermoplastic resin film, method of manufacturing the same, back sheet for solar cell, and solar cell module
A thermoplastic resin film and thermoplastic resin technology, applied in the direction of electrical components, chemical instruments and methods, synthetic resin layered products, etc., can solve the problems of hydrolysis and degradation over time, and achieve long-term stable power generation performance, dimensional stability and water resistance Excellent degradability and excellent durability
Active Publication Date: 2013-03-27
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AI-Extracted Technical Summary
Problems solved by technology
 However, polyester usually has many carboxyl groups and hydroxyl groups on its surface, an...
At present, consider from the aspect that obtains shrinkage rate greatly, there is the tendency that increases gap, but when carrying out lateral stretching, produce tensile stress difference in the holding portion and non-holding portion utilizing holding member, particularly Non-uniform stretching tends to occur at film width direction end portions. Therefore, in the present invention, the stretching uniformity is maintained by the length B of the holding member and the holding interval A satisfying the formula (2). That is, when the ratio of the pass gap is 0.06 or more, the shrinkage difference that tends to occur between the center portion and the end portion of the film in the film width direction can be suppressed, the basic physical properties such as thermal shrinkage rate are uniform, and the dimensional stability is excellent. In addition, when the ratio of the gap is 0.15 or less, the difference in tensile stress between the gripping portion and the non-gripping portion at the time of lateral stretching can be reduced, and the dimensional stability is improved.
At this time, the tension force is relieved by thermal relaxation, thus, the hydrolysis resistance tends to deteriorate, but by setting the shrinkage rate of the film at this time as 3% or more and 8% or less for shrinkage treatment The time and the average rise rate of the film surface temperature from the end of the transverse stretching in the stretching process to the film surface temperature reaching the highest temperature during the shrinkage process are adjusted to a specified range, which can maintain high dimensional stability of the resin film. Provides excellent hydrolysis resistance.
By setting the thickness of the sheet-like polyester film body below 5 mm, the delay in cooling caused by the heat storage of the molten material is avoided, and in addition, by setting it above 0.5 mm, from extrusion to cooling During this period, the OH group or COOH group in the polyester diffuses into the interior of the polyester, and the exposure of the OH group and COOH group, which is the main cause of hydrolysis, to the surface of the polyester is suppressed.
In the esterification reaction step, it is particularly preferred that the titanium compound as the catalyst component and the magnesium compound and the phosphorus compound as the additive satisfy the mode of the following relational formula (ii) with the value Z calculated by the following formula (i) The case of adding and melt-polymerizing. Here, the P content is the amount of phosphorus derived from the entire phosphorus compound containing a pentavalent phosphate ester not having an aromatic ring, and the Ti content is the amount of titanium derived from the entire Ti compound containing an organic chelate titanium complex. By selecting and using the magnesium compound and the phosphorus compound in the catalyst system containing the titanium compound in this way and controlling their addition timing and addition ratio, the catalyst activity of the titanium compound can be maintained at a moderately high level, and at the same time, a less yellow hue can be obtained. In subsequent film formation (melting) and the like, heat resistance that is less likely to cause yellow coloration can be imparted even when exposed to high temperatures.
In the present invention, in order to have both the hydrolysis resistance and the dimensional stability of thermoplastic resin film, in each operation that constitutes lateral stretching operation, in the thermal fixation operation and/or thermal relaxation operation after lateral stretching, Shrinkage treatment is performed on the thermoplastic resin film in the range of shrinkage rate represented by the following formula (1) in the range of 3% or more and 8% or less in the longitudinal direction while narrowing the holding interval between adjacent holding members. In short, in the lateral stretching step, relaxation treatment is given along the longitudinal direction (MD; Machine Direction) of the resin film. This shrinkage treatment can improve the dimensional stability of the resin film.
In the present invention, it is possible to heat the surface of the thermoplastic resin film in such a manner that the highest film surface temperature (in this specification, also referred to as "heat setting temperature") is in the range of 160°C to 210°C, Heat fixing is preferably performed. By heating the thermoplastic resin film to which tension is applied at a heat setting temperature in the range of 160° C. to 210° C., crystals of polymer molecules can be oriented and hydrolysis resistance can be imparted. That is, when the heat setting temperature is 160° C. or higher, the shrinkage rate is large and the dimensional stability is good. In terms of hydrolysis resistance, thermoplastic resins such as polyester are easily crystallized, and polymer molecules such as polyester molecules are stretched. Immobilized to improve hydrolysis resistance. In addition, when the heat setting temperature is 210° C. or lower, dimensional stability tends to be improved, shrinkage of polymer molecules originating from entanglement among polymer molecules can be suppressed, and high hydrolysis resistance can be maintained.
In the present invention, special synthesis, etc. are not required, and cheap and easily available titanium compounds, phosphorus compounds, and magnesium compounds can be used to obtain coloring with respect to hue and heat while having the reactivity required for the reaction. Polyester with excellent resistance.
In this transportation, the holding member 2a (2c) that holds one end portion of the thermoplastic resin film in the width direction (TD direction) in the preheating section 10 and the other holding member 2a (2c) adjacent to the holding member 2a (2c) Compared with the interval between the members 2b (2d), the holding member 2a (2c) which holds one end portion of the width direction of the thermoplastic resin film in the cooling part 50 and the other holding members 2b ( 2d), the conveying speed of the thermoplastic resin film is reduced. In this way, relaxation in the MD direction can be performed in the cooling unit 50 .
Shrinkage treatment (MD shrinkage) among the present invention is carried out as follows: for example, under the state that utilizes the holding member that arranges in such as transverse stretching device etc. to hold film, in film length direction, while reducing its holding interval The thermoplastic resin film is shrunk in the range of 3% or more and 8% or less of shrinkage rate represented by following formula (1). Specifically, for example, as shown in FIG. 1, the shrinking process is performed as follows: 2o and 2p) each moving speed and shorten the distance between grippers to reduce the holding interval.
This polyester can be used for applications (such as optical films, industrial plastic films (risu)) that require high transparency, and does not require the use of expensive germanium-based catalysts, therefore, it is possible to achieve significant cost reductions. In addition, since it is also possible to avoid the contamination of foreign matter originating in the catalyst that is likely to occur in the Sb catalyst system, it is possible to reduce the occurrence of failures and poor quality in the film forming process, and to achieve cost reduction due to increased yield.
 By applying tension to the film so that the polymer molecules are stretched in the longitudinal direction of the molecules, the hydrolysis resistance of the resin film becomes good. On the other hand, the dimensional stability of the film is preferably in a state where the distance between molecular chains of polymer molecules is shrunk. This is considered to be because when there is a gap between the molecular chains of polymer molecules, the molecular chains tend to shrink due to intermolecular interaction, and the dimensional stability of the film deteriorates (that is, the heat shrinkage rate increases).
 In the present invention, shrinkage treatment (hereinafter also referred to as MD shrinkage) is performed in the longitudinal direction (MD) of the thermoplastic resin film in the heat setting step and/or the heat relaxation step described later. By performing MD shrinkage, the dimensional stability and hydrolysis resistance of the film can be simultaneously improved.
 In addition, the length B of the holding member is preferably in the range of 100 mm or more and 140 mm or less. By satisfying the relational expression shown in formula (2), the length of the holding member is in the range of more than 100 mm, and then suppressing the tensile stress difference between the holding part and the non-holding part of the holding member during lateral stretching to make it smaller small, thereby maintaining stretch uniformity. Since the length of the holding member is in the range of 140 mm or less, the difference in shrinkage between the center portion and the end portion of the film can be suppressed, and the ...
Provided is a method of manufacturing a biaxially stretched thermoplastic resin film that is excellent in dimensional stability and hydrolysis resistance. The method includes a process of forming a thermoplastic resin sheet, a process of longitudinally stretching the resin sheet in a longitudinal direction, and a process of transversely stretching the resin sheet in a transverse direction after the longitudinal stretching. The transverse stretching process includes a process of preheating the resin sheet after the longitudinal stretching, a process of transversely stretching the resin sheet in the transverse direction after the preheating, a process of thermally fixing the film that is obtained through the stretching, a process of relaxing the tension applied to the film, and a process of cooling the film. At least one of the thermal fixing and the thermal relaxing performs contraction treatment of the thermoplastic resin film in the longitudinal direction of the film in such a manner that a contraction ratio expressed by the following Formula (1) is within a range of 3 to 8% while narrowing a grip distance between gripping members adjacent to each other, a total contraction treatment time in the thermal fixing and the thermal relaxing is 10 to 60 seconds, and an average rising rate of a film surface temperature from a termination point of time of the transverse stretching in the stretching process until a film surface temperature reaches a maximum arrival temperature in an interval in which the contraction treatment is performed so as to satisfy the contraction ratio is 0.6 to 4.5 [deg.]C/second.
Synthetic resin layered productsPhotovoltaic energy generation +1
Rise rateBackplane +7
- Experimental program(7)
 (Example 1)
 As shown below, the direct esterification method in which terephthalic acid and ethylene glycol are directly reacted and the water is distilled off is used, and after esterification, polycondensation is carried out under reduced pressure to obtain polyester (Ti catalyst based PET ).
 (1) Esterification reaction
 In the first esterification reaction tank, 4.7 tons of high-purity terephthalic acid and 1.8 tons of ethylene glycol were mixed over 90 minutes to form a slurry, and the slurry was continuously supplied to the first esterification reaction tank at a flow rate of 3800 kg/h. and then. Continuously supply the ethylene glycol solution of citric acid chelated titanium complex (VERTEC AC-420, manufactured by Johnson Matthey Co., Ltd.) in which citric acid is coordinated to Ti metal. The temperature in the reaction tank is 250 ℃ and stirred Next, the reaction was carried out with an average residence time of about 4.3 hours. At this time, the citric acid chelate titanium complex was continuously added so that the addition amount of Ti was 9 ppm in terms of element conversion value. At this time, the acid value of the obtained oligomer was 600 equivalents/ton.
 The reactant was transferred to the second esterification reaction tank and reacted at an average residence time of 1.2 hours at a temperature of 250° C. in the reaction tank under stirring to obtain an oligomer having an acid value of 200 equivalents/ton. The inside of the second esterification reaction tank is divided into three zones. From the second zone, the magnesium acetate ethylene glycol solution is continuously supplied so that the amount of Mg added in element conversion is 75 ppm. Next, from the third zone The P addition amount was 65 ppm in terms of element conversion value, and the ethylene glycol solution of trimethyl phosphate was continuously supplied.
 (2) Polycondensation reaction
 The esterification reaction product obtained above was continuously supplied to the first polycondensation reaction tank, and under stirring, the reaction temperature was 270°C, and the pressure in the reaction tank was 20 torr (2.67×10 -3 MPa), the polycondensation was carried out with an average residence time of about 1.8 hours.
 It is further transferred to the second polycondensation reaction tank, where the temperature in the reaction tank is 276°C, and the pressure in the reaction tank is 5torr (6.67×10 -4 MPa), the reaction (polycondensation) is carried out under the conditions of a residence time of about 1.2 hours.
 Then, it is further transferred to the third polycondensation reaction tank. In this reaction tank, the temperature in the reaction tank is 278°C and the pressure in the reaction tank is 1.5 torr (2.0×10 -4 MPa), the reaction (polycondensation) was carried out under the conditions of a residence time of 1.5 hours to obtain a reactant (polyethylene terephthalate (PET)).
 Next, the obtained reactant was sprayed into cold water in strips, and cut immediately to produce polyester pellets (cross section: long diameter approximately 4 mm, short diameter approximately 2 mm, length: approximately 3 mm).
 The obtained polyester was measured as follows using high resolution high frequency inductively coupled plasma mass spectrometry (HR-ICP-MS; AttoM manufactured by SII Nanotech Co., Ltd.), and the results were Ti=9 ppm, Mg=75 ppm, and P=60 ppm. The amount of P added was slightly reduced from the initial amount, and it was presumed to volatilize during the polymerization process.
 The obtained polymer had IV=0.65, amount of terminal carboxyl group (AV)=22 equivalent/ton, melting point=257°C, and solution haze=0.3%. The measurement of IV and AV was performed by the method shown below.
 (3) Solid phase polymerization
 The pellets of the polyester obtained as described above are subjected to solid phase polymerization by a batch method. That is, after the polyester pellets are put into the container, it is vacuumed, and the pre-crystallization treatment is carried out at 150°C while stirring, and then the solid phase polymerization reaction is carried out at 200°C for 30 hours.
 The polyester raw resin is obtained as above.
 -Sheet film making process-
 After drying the polyester raw resin (PET resin A) obtained above to a water content of 20 ppm or less, it was put into a hopper of a single screw kneading extruder with a diameter of 113 mm. The PET resin A was melted at 300°C, and extruded from the die via a gear pump and a filter (pore size 20 μm) according to the following extrusion conditions.
 Regarding the extrusion conditions of the molten resin, the pressure fluctuation was set to 1%, and the temperature distribution of the molten resin was set to 2%.
 Specifically, the back pressure of the barrel of the extruder is set to a pressure that is 1% higher than the average pressure in the barrel of the extruder, and the piping temperature of the extruder is set to the average pressure in the barrel of the extruder. Heat at a temperature 2% higher.
 The molten resin is extruded from the die onto the cooling casting drum, and is brought into close contact with the cooling casting drum using an electrostatic application method. The cooling of the molten resin was performed by setting the temperature of the cooling casting drum to 25°C, and blowing cold air of 25°C from a cold air generator installed opposite the cooling casting drum to the molten resin. Regarding the resin on the cooling casting drum, a peeling roll arranged opposite to the cooling casting drum was used to peel an unstretched polyester sheet (unstretched PET sheet) having a thickness of 3.5 mm from the cooling casting drum.
 The obtained unstretched PET sheet had intrinsic viscosity (IV) = 0.75, terminal carboxyl group concentration (AV) = 15.5 equivalents/ton, and glass transition temperature (Tg) = 72°C.
 For IV, the unstretched polyester sheet is dissolved in a mixed solvent of 1,1,2,2-tetrachloroethane/phenol (=2/3 [mass ratio]), and the mixed solvent is heated at 25°C. The solution viscosity of.
 For AV, completely dissolve the unstretched polyester sheet in a mixed solution of benzyl alcohol/chloroform (=2/3; volume ratio), use phenol red as an indicator, and use the standard solution (0.025N KOH-methanol The mixed solution) is titrated and calculated from the titration amount. Tg is obtained by the measurement based on JISK7121.
 The obtained unstretched PET sheet was stretched by successively biaxially stretching by the following method to produce a biaxially stretched polyester film (biaxially stretched PET film) having a thickness of 250 μm.
 -Longitudinal stretching process-
 The unstretched PET sheet was passed between two pairs of nip rolls with different peripheral speeds, and stretched in the longitudinal direction (conveying direction) under the following conditions.
 Preheating temperature: 80℃
 Longitudinal stretching temperature: 90℃
 Longitudinal stretching ratio: 3.4 times
 Longitudinal tensile stress: 12MPa
 -Horizontal stretching process-
 Use has figure 1 The transverse stretch tenter of the structure shown stretched the PET film (longitudinal stretched PET film) stretched in the longitudinal direction under the following conditions.
 (Preheating section)
 Preheating temperature: set to 130°C and heat in a stretchable manner.
 (Stretching part)
 The preheated longitudinally stretched PET film was stretched in the transverse direction by applying tension in the film width direction orthogonal to the longitudinally stretched direction (length direction) under the following conditions.
 ·Stretching temperature (transverse stretching temperature): 140℃
 ·Stretching ratio (transverse stretching ratio): 4.4 times
 ·Tensile stress (transverse tensile stress): 18MPa
 ·The film surface temperature at the exit of the stretching zone: 138℃
 (Thermal fixing part)
 Adjust the temperature setting and wind speed of the film heating air in the heat fixing area, and fix the heat of the film surface to the highest temperature (T Heat fixation ) Was adjusted to the temperature (193°C) shown in Table 1 below. Here, the shrinking treatment (MD shrinking) in the longitudinal direction (MD) of the film is not performed.
 Shrinkage rate: 0%, length direction (ΔS): 0%, lengthwise shrinkage treatment time: 0 seconds
 (Thermal relaxation part)
 The temperature of the film surface is adjusted in the same way as in the heat fixation area, and the thermal relaxation of the film surface reaches the highest temperature (T Thermal relaxation ) Was adjusted to the temperature (198°C) shown in Table 1 below. In addition, the film width direction (TD) was subjected to relaxation treatment at the shrinkage rate shown in Table 1 below, and the film longitudinal direction (MD) was subjected to shrink treatment (MD shrinkage) at the shrinkage rate and treatment time shown in Table 1 below.
 In this example, in the thermal relaxation zone where the shrinkage in the longitudinal direction (MD) is performed, the maximum reached temperature of the film surface (the maximum reached film surface temperature) reached 198°C, and the maximum film temperature reached from the exit of the stretching zone The time is 34 seconds. Therefore, the average ascent speed is 1.8.
 Horizontal direction (ΔL): Shrinkage rate [%] shown in Table 1 below
 Length direction (ΔS): Shrinkage rate shown in Table 1 below [%]
 Shrinkage treatment time in the length direction: the time shown in Table 1 below [sec]
 Here, the horizontal direction (ΔL) is the distance between the clamps in the width direction holding the base. When the distance at the entrance of the thermal relaxation part is L2, and the distance at the exit is L3, ΔL=[(L2- L3)/L2]×100 shows the shrinkage rate.
 ·Fixture conditions
 Gap ratio [A/(A+B)]: The ratio shown in Table 1 below
 Fixture length: the length shown in Table 1 below [mm]
 (Cooling part)
 Next, the polyester film after thermal relaxation was cooled at a cooling temperature of 65°C.
 (Recycling of film)
 After cooling, the ends of the polyester film were trimmed by 20 cm. Then, it was extruded and processed (knurled) with a width of 10 mm at both ends, and then wound with a tension of 25 kg/m.
 A biaxially stretched PET film with a thickness of 250 μm was produced as described above.
 The following evaluation was performed on the obtained biaxially stretched PET film. The evaluation results are shown in Table 1 below.
 (1) Dimensional stability (thermal shrinkage rate)
 The thermal shrinkage rate of the longitudinal direction (MD) and the width direction (TD) of the obtained biaxially stretched PET film was measured by the following method, and it set it as the index which evaluates the dimensional stability of a biaxially stretched PET film. in particular,
 Cut the biaxially stretched PET film to produce a sample piece M with a size of TD: 30mm and MD: 120mm. To this sample piece M, put two reference lines in the MD direction at 100mm intervals, and under no tension Place in a heated oven at 150°C for 30 minutes. After this leaving, the sample piece M is cooled to room temperature, and the interval between the two reference lines is measured again. The measured value here is defined as A (unit; mm), and the thermal shrinkage rate [%] in MD is calculated from the equation of 100×(100-A)/100.
 Separately from the above, the biaxially stretched PET film was cut to produce a sample piece L with a size of MD: 30 mm and TD: 120 mm, and two pieces of the sample piece L were placed at an interval of 100 mm in the TD direction. Except for the reference line, the measurement was performed in the same manner as the sample piece M, and the thermal shrinkage rate [%] in TD was obtained from the equation.
 A: Both MD and TD have a thermal shrinkage rate of 1% or less.
 B: The heat shrinkage rate of either MD or TD exceeds 1%, and the heat shrinkage rate of both MD and TD is 2% or less.
 C: The thermal shrinkage rate of either MD or TD exceeds 2%, and the thermal shrinkage rate of both MD and TD is 3% or less.
 D: The heat shrinkage rate of either MD or TD exceeds 3%.
 (2) Hydrolysis resistance (elongation at break halved time)
 The hydrolysis resistance of the biaxially stretched PET film was evaluated with the elongation at break halved time of the biaxially stretched polyester film as an index. in particular,
 The biaxially stretched PET film obtained above was stored under environmental conditions of a temperature of 120°C and a relative humidity of 100%, and the elongation at break (%) of the biaxially stretched PET film after storage was determined relative to that before storage. The elongation at break (%) shown by the biaxially stretched PET film becomes the storage time [hr] of 50%, and this is defined as the time for halving the elongation at break. In addition, the biaxially stretched PET film was cut to produce a sample piece P with a size of 1 cm×20 cm. The sample piece P was stretched with a tensile testing machine at a chuck pitch of 5 cm and 20%/min. The elongation at break (%) of the biaxially stretched PET film.
 For the hydrolysis resistance of the biaxially stretched PET film, it means that the longer the elongation at break halving time, the better.
 A: The time for halving the elongation at break exceeds 90 hr.
 B: The elongation at break halved time exceeds 85 hours and is 90 hours or less.
 C: The elongation at break halved time exceeds 80 hr and is 85 hr or less.
 D: The elongation at break halving time is less than 80 hr.
 (3) Comprehensive judgment
 The judgment was made based on the evaluation results of (1) to (2) above and based on the following judgment criteria.
 A: Very good (both dimensional stability and hydrolysis resistance are evaluated as "A")
 B: Good (both dimensional stability and hydrolysis resistance are evaluated as "B" or higher)
 C: No problem (both dimensional stability and hydrolysis resistance are evaluated as "C" or higher)
 D: Problematic (Either or both of dimensional stability and hydrolysis resistance are evaluated as "D")
 Furthermore, using the obtained biaxially stretched PET film, a back sheet was produced as follows.
 -Preparation of pigment dispersion-
 The components in the following composition were mixed, and the mixture was subjected to a dispersion treatment with a Dyno-mill type disperser for 1 hour to prepare a pigment dispersion.
 ·Titanium dioxide (volume average particle size = 0.42μm···39.9 mass%
 (Ti paque R-780-2, manufactured by Ishihara Kogyo Co., Ltd., solid content 100% by mass)
 ·Polyvinyl alcohol ···8.0% by mass
 (PVA-105, manufactured by Kuraray Co., Ltd., solid content: 10% by mass)
 ·Surfactant ···0.5% by mass
 (Demol EP, manufactured by Kao Co., Ltd., solid content: 25% by mass)
 ·Distilled water ···51.6 mass%
 -Preparation of coating liquid for reflective layer-
 The components in the following composition were mixed to prepare a coating liquid for a reflective layer.
 ·The above pigment dispersion ···80.0 parts
 ·Polyacrylic resin aqueous dispersion ···19.2 parts
 (Binder: Julimar ET410, manufactured by Nippon Pure Chemical Industries, Ltd., solid content: 30% by mass)
 ·Polyoxyalkylene alkyl ether ···3.0 parts
 (Naroacty CL95, manufactured by Sanyo Chemical Co., Ltd., solid content: 1% by mass)
 ·Oxazoline compound (crosslinking agent) ···2.0 parts
 (Epocros WS-700, manufactured by Japan Catalysis Chemical Industry Co., Ltd., solid content: 25% by mass)
 ·Distilled water ···7.8 parts
 -Formation of reflective layer-
 The obtained coating solution for the reflective layer was coated on a biaxially stretched PET film, and dried at 180°C for 1 minute to form a titanium dioxide amount of 6.5 g/m 2 The white layer (light-reflecting layer) as the colored layer.
 -Preparation of coating solution for easy adhesion layer-
 The components in the following composition were mixed to prepare a coating liquid for an easily adhesive layer.
 ·Polyolefin resin aqueous dispersion ···5.2 parts
 (Binder: Chemipearl S-75N, manufactured by Mitsui Chemicals Co., Ltd., solid content: 24% by mass)
 ·Polyoxyalkylene alkyl ether ···7.8 parts
 (Naroacty CL95, manufactured by Sanyo Chemical Co., Ltd., solid content: 1% by mass)
 ·Oxazoline compound (crosslinking agent) ···0.8 parts
 (Epocros WS-700, manufactured by Nippon Catalysis Chemical Industry Co., Ltd., solid content: 25% by mass)
 ·Silica fine particle water dispersion ···2.9 parts
 (Aerosil OX-50, manufactured by Japan Aerosil Co., Ltd., volume average particle size = 0.15 μm, solid content: 10% by mass)
 ·Distilled water ···83.3 parts
 -Formation of easily adhesive layer-
 The obtained coating liquid is 0.09g/m with the amount of binder 2 The method is coated on the light reflective layer and dried at 180°C for 1 minute to form an easily adhesive layer.
 -Preparation of coating liquid for back layer-
 The components in the following composition were mixed to prepare a coating liquid for the back layer.
 ·Ceranate WSA-1070 (adhesive) ···323 copies
 (Acrylic/silicone adhesive, manufactured by DIC Co., Ltd., solid content: 40% by mass)
 ·Oxazoline compound (crosslinking agent) ···52 parts
 (Epocros WS-700, manufactured by Nippon Catalysis Chemical Industry Co., Ltd., solid content: 25% by mass)
 ·Polyoxyalkylene alkyl ether (surfactant) ···32 parts
 (Naroacty CL95, manufactured by Sanyo Chemical Co., Ltd., solid content: 1% by mass)
 ·Distilled water ···594 parts
 -Formation of the back layer-
 On the side where the reflective layer and easy bonding layer of the biaxially stretched PET film are not formed, the amount of adhesive is 3.0 g/m in terms of wet coating amount 2 The obtained back layer coating liquid was applied in the manner described above, and dried at 180° C. for 1 minute to form a back layer with a dry thickness of 3 μm.
 Make the backplane as above.
 (Example 2)
 In Example 1, the film forming speed in the sheet film forming process, the heating air temperature in the transverse stretching process, the wind speed, and the MD relaxation treatment time were adjusted, and a double was produced in the same manner as in Example 1. The PET film was axially stretched and evaluated, and the back sheet was produced at the same time. The evaluation results are shown in Table 1 below.
 (Examples 3-7, 11-13, 15-16, Comparative Examples 1-5)
 In Example 1, as shown in Table 1 below, the IV of the unstretched PET sheet, the heat-fixing part in the transverse stretching process, the heat treatment conditions in the heat-relaxing part, and the jig conditions were changed as shown in Table 1 below. Example 1 In the same manner, a biaxially stretched PET film was produced and evaluated, and a back sheet was produced at the same time. The evaluation results are shown in Table 1 below.
 In addition, the IV of the unstretched PET sheet is adjusted by changing the time of solid phase polymerization to adjust the IV of the raw material resin, and the IV of the unstretched PET sheet molded by melt extrusion is adjusted.
|Thickness||180.0 ~ 400.0||µm|
|Glass transition temperature||72.0||°C|
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