TW201132499A - Highly adhesive polyester film for solar sell - Google Patents

Abstract

The present invention provides a highly adhesive polyester film for solar cell with excellent adhesive and a back sheet using the same. A polyester film with a substrate thickness of 20 to 500 μ m having a coating layer on at least one surface is provided with a coating layer having a main component of urethane resin consisted of aliphatic polycarbonate polyol; in which an absorbance ratio (an absorbance closed to 1460 cm<SP>-1</SP> from aliphatic polycarbonate component/ an absorbance closed to 1530 cm<SP>-1</SP> from urethane component) measured by infrared spectroscopy is 0.70 to 1.60.

Description

201132499 VI. Description of the Invention: [Technical Field] The present invention relates to an easily adhesive polyester film for a solar cell. More specifically, it is a polyester film which is excellent in adhesion to a sealing agent even under high temperature and high humidity. [Prior Art] In recent years, solar cells have attracted attention as an energy method that can replace petroleum energy that causes global warming. A solar cell is a solar power system that converts the energy of sunlight directly into electricity. The solar cell element is a semiconductor such as a single crystal germanium, a polycrystalline germanium or an amorphous germanium, or a compound system or an organic dye. In general, solar cell components are manufactured by connecting several to several tens of wires in series 'parallel, and for long-term (about 20 years or more) protection components. The unit assembled in this configuration is called a "solar battery module". In general, a solar cell module is made of a glass-covered surface that is exposed to sunlight, a solar cell element is embedded in a sealing material, and a back surface is made of a heat-resistant and weather-resistant plastic material. A protective sheet composed of a plurality of layer structures is protected by a protective sheet. The sealing material for charging the solar cell element is an ethylene vinyl acetate copolymer resin (hereinafter referred to as "EVA") or a polyvinyl butyral resin (hereinafter, referred to as "PVB"). Or an olefin resin. The module can be obtained by laminating the above-mentioned glass substrate/sealing material/solar cell element/sealing material/backing plate with a vacuum laminator or the like by thermocompression bonding. Seal 201132499 is a polyester with a solar cell element that can be subsequently solidified from the outside to protect the solar cell. The solar cell backsheet has been proposed to be polyester from the side (sealing material side). Film/adhesive/poly)/metal, or metal oxide-based film layer (moisture-proof layer) film (anti-fouling layer) or the like. It is important that the back sheet is a laminate between the materials on the side of the solar cell element which is in direct contact with the sealing material to protect the solar cell element from moisture or contamination. However, since sufficient adhesion cannot be obtained without applying a surface film, a method of providing an adhesive layer containing a resin or a crosslinking agent as a film has been proposed (Patent Documents 1 to 4). PRIOR ART DOCUMENT PATENT DOCUMENT PATENT DOCUMENT PATENT DOCUMENT PATENT DOCUMENT PATENT DOCUMENT PATENT DOCUMENT PATENT DOCUMENT PATENT DOCUMENT PATENT DOCUMENT PATENT DOCUMENT PATENT DOCUMENT PRIOR ART [2007] No. 2007-136911 [Content of the invention] [Technical problems to be solved] The solar power equipment used under strict environmental conditions outside the house can be obtained for a long period of durability of more than 20 years. Therefore, the sealing material of the piece is easy to follow the film, not only the initial setting, but also the role of the 牛. The vinegar film of the solar cell component (coloring/adhesive/fluorine thin is free from the external effect. Therefore, the polyester film and the sealing treatment of the polyester are thinner and improved. There has been an improvement of the polyester thin report. In order to be used as a build-up property, it is necessary to maintain the adhesion during the long period of high temperature and high humidity. However, as disclosed in the above-mentioned invention patent document, the easy-adhesive polyester film for solar cells, The adhesiveness is not sufficient, especially in the long-term use under high temperature and high humidity, the decrease in the strength of the adhesive is always unavoidable. Furthermore, from the viewpoint of improving productivity or preventing deterioration, the sealing material has evolved. Various types of constituents containing an additive such as a crosslinking agent or an ultraviolet absorber are used. Therefore, a highly versatile easy-adhesive film which exhibits an equivalent degree of adhesion to various sealing materials is also required. The technical problem is to provide a bond with strength that can withstand in a strict environment, and hardly cause it to be previously considered to be unavoidable under high temperature and high humidity. [Easy method for solving the problem] The invention of the present invention has been found to solve the above-mentioned technical problems and has been found to be focused on the problem. : a polyester film having a coating layer on at least one side, and the coating layer is a urethane resin containing an aliphatic polycarbonate polyol as a constituent component, particularly an aliphatic polycarbonate polyol When the urethane resin as a constituent component is a main component, the absorbance (A146Q) derived from the aliphatic polycarbonate component in the vicinity of 1 460 cm·1 in the infrared spectroscopy spectrum is derived from the urethane. The ratio of the absorbance (A153()) in the vicinity of 1 5 3 0 of the ester component (A146〇/A153〇) is a coating layer of 0.70 to 1.60, whereby the strength which can be tolerated under a strict environment can be exhibited. Sex

S.S -5-201132499, and excellent adhesion under high temperature and high humidity, finally arrived. In addition, when the coating layer is a urethane resin containing a fatty polycarbonate polyol as a component and a crosslinking agent as a main component, in the red spectrum spectrum, it is derived from an aliphatic polycarbonate component. The ratio of the absorbance (A146Q) in the vicinity of 1460 to the absorbance (A153Q) near the 1530 derived from the urethane component (A146Q/A153Q) is 0.50, whereby various sealing materials can be exhibited in high temperature and high humidity. The present invention has finally been achieved with excellent performance. The foregoing technical problem can be solved by the following solutions. (1) An easy-to-adherent polyester film for solar energy, which is a polyester having a coating layer having a coating thickness of 20 to 500 mm on one side. Further, the coating layer is a urethane resin containing an aliphatic polycarbonate polyol as a component. (2) The above-mentioned easy-adhesive polyester film for a solar cell, which is characterized in that an aliphatic polycarbonate polyol is used as a constituent component of a urethane resin as a main component, and an infrared spectrum spectrum of the coating layer is used. The ratio of the vicinity of 1 460 cnT1 (A1460) derived from the aliphatic polycarbonate component to the luminosity (Ai53G) derived from the urethane component of 1530 cm -1 (Αι46〇/Αι53.) is 0_70 to 1.60. (3) The above-mentioned easy-adhesive polyester film for a solar cell, wherein the coating layer is based on an aliphatic polycarbonate polyol as a constituent component of a urethane resin and a crosslinking agent, and is in the coating layer The red hair is made of the outer line cm'1 cm'1 1.55. At least the film constitutes the amine-based light-absorbing light. The amine outside line 201132499 is obtained from the spectral spectrum of the aliphatic polycarbonate component. The ratio of the absorbance (A146Q) to the absorbance (Ai53G) near the 153〇 derived from the urethane component (Ai46〇/Ai53G) is 〇.50 to 〇(4). The ester film is at least one selected from the group consisting of a melamine-based crosslinking agent, an isocyanate-based crosslinked carbodiimide-based crosslinking agent, and an oxazoline-based crosslinking agent. (5) The content of the crosslinking agent in the coating layer in the coating layer is 5 mass% or more and 90 mass% or less with respect to the urethane tree. (6) The above-mentioned easy-adhesive polyester film for a solar cell, which is a white polyester film. (7) A back sheet for a solar cell, which is formed by laminating an easy-contact polyester film for a battery as described above. [Effects of the Invention] The easy-adhesive polyester film for a solar cell of the present invention exhibits adhesion, particularly in high-temperature and high-humidity (excellent heat and humidity resistance). Therefore, a preferred embodiment is at the above-mentioned high temperature. In addition, in the preferred embodiment of the present invention, when the easy-adhesive poly film for a solar cell of the present invention is used as a member of a back sheet, the sealing material is used as a backing material. The adhesiveness is good, cm cm·1 1.55, and the cross-linking grease is a relatively thin ester in which the yang energy is strong. 201132499 [Embodiment] [Form of the invention] (Polyester film) Used in the present invention The polyester resin constituting the substrate can be used: polyethylene terephthalate, polybutylene terephthalate, polyethylene-2,6-naphthalate, polyterephthalic acid Methylene ester, and a diol component such as diethylene glycol, neopentyl glycol, polyalkylene glycol, or adipic acid, sebacic acid, phthalic acid, isophthalic acid, 2,6 Copolymerization of a dicarboxylic acid component such as naphthalene dicarboxylic acid A polyester resin or the like which is obtained by copolymerization. The polyester resin suitable for use in the present invention is mainly composed of polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate. At least one is a constituent. Among these polyester resins, polyethylene terephthalate is preferred from the viewpoint of balance between physical properties and cost. Further, these polyester films can be subjected to biaxial stretching to improve chemical resistance, heat resistance, mechanical strength and the like. Further, the polyester film of the present invention may be a single layer of a polyester film or a polyester film having at least three layers of an outermost layer and a center layer. In the present invention, when the three-layer structure is used, particles may be contained in the outermost layer (in the case of the above two layers, the layer A), and in the center layer (in the case of the above two layers, B) The layer) may be substantially free of particles. In the case where the polyester film of the present invention is used as a member for a solar cell, it is preferable to prevent the deposition of a laminated metal, a metal oxide film layer or a coating layer. Operational use in subsequent processing steps such as wet functional layer and antifouling function 201132499. When particles are added to the outermost layer, sufficient workability suitable for workability can be obtained. Further, the reason why the particles are substantially not contained in the layer B is preferable because the formation of protrusions due to the agglomeration of the lubricant particles, particularly the inorganic particles, can be reduced. Further, by adopting such a configuration, a film having high transparency can be obtained, and it is also suitable for a field requiring transparency such as a see-through type solar cell. In addition, the phrase "substantially does not contain inert particles" means that, for example, in the case of inorganic particles, when the elements derived from the particles are quantitatively analyzed by fluorescent X-ray analysis, less than 50 ppm can be obtained. Preferably, it is less than 1 〇 PPm, and the best is below the detection limit. This is because even if the particles are not actively added, there is a possibility that the contaminated component derived from the foreign matter or the raw material resin or the stain adhered to the production line or the device in the film production step is peeled off and mixed into the film. These layers may contain various additives in the polyester as needed. The additive includes, for example, an antioxidant, a light stabilizer, an antigelling agent, an organic wetting agent, an antistatic agent, an ultraviolet absorber, a surfactant, and the like. The type and content of the particles contained in the outermost layer are not particularly limited, and may be inorganic particles or organic particles. For example, metal oxides such as cerium oxide, cerium oxide, talc, and kaolinite, inorganic particles such as calcium carbonate, calcium phosphate, and barium sulfate which are inert to the polyester can be exemplified. These inert inorganic particles may be used singly or in combination of two or more. 201132499 The average particle diameter of the aforementioned particles is preferably from 0.1 to 3.5 &quot; m. The lower limit of the average particle diameter is preferably 0.5 μm, more preferably 〇.8/zm, still more preferably 1.0/zm. Further, the upper limit of the average particle is more preferably 3 Å/zm, still more preferably 2.8 Mm. If the average particle diameter is less than 〇.1/irn, sufficient workability cannot be obtained. When it exceeds 3.5/zm, it is easy to form coarse protrusions. Further, such particles are preferably porous particles, and particularly preferably porous ceria. The porous particles are preferably deformed into a flat type when stretched in the film forming step, and the transparency is reduced to be small, which is preferable. The content of the outermost inorganic particles is preferably from 〇1 to 0_20% by mass based on the polyester constituting the outermost layer. The lower limit of the concentration is more preferably 0. 02% by mass, still more preferably 0.03% by mass. Further, the upper limit of the concentration is more preferably 0,15% by mass, still more preferably 〇.1% by mass. If it is less than 0.01% by mass, sufficient workability cannot be obtained. When it exceeds 〇·2 mass%, transparency will fall, and it is unpreferable. The measurement of the average particle diameter of the above particles can be measured by the following method. Photographing particles by electron microscopy or optical microscopy to determine the maximum diameter of 300 to 500 particles in the case of a minimum particle size of 2 to 5 mm (in the case of porous ceria) The particle size) is based on the average enthalpy as the average particle diameter. Further, when the average particle diameter of the particles in the coating layer of the laminated film is to be measured, the maximum diameter of the particles can be measured by using a transmission electron microscope (TEM) to photograph the cross section of the laminated film at a magnification of 120,000 times. -10- 201132499 A method of mixing the above particles with polyester can be carried out by a conventional method. For example, it may be added at any stage of the production of the polyester, but it is preferably added in the esterification stage or after the end of the transesterification reaction or before the start of the polycondensation reaction to be dispersed in a slurry of ethylene glycol or the like. A polycondensation reaction is carried out. Further, a kneading extruder equipped with a vent hole may be used to blend a slurry of particles dispersed in ethylene glycol or water with a polyester raw material, or a kneading extruder may be used for blending. The dried particles and the method of the polyester raw material are carried out. From the viewpoint of improving the photoelectric conversion efficiency of the solar cell, the film of the present invention preferably uses a white polyester film as the polyester film so that it can also utilize reflected light. In order to effectively exhibit light reflectivity, the white polyester film preferably has an L値 of 85.0 to 100, a値 of -10.0 to +10.0, and b値 of -10.0 to +1 〇. If it is in this range, the reflectance of light can be increased, so that it is preferable. From the viewpoint of imparting whiteness or concealability to the polyester film of the substrate as described above and improving light reflectivity, it is preferred to contain a white pigment and/or inorganic particles on the substrate. As the white pigment used for the white polyester film, titanium oxide, barium sulfate, zinc oxide, zinc sulfide, calcium carbonate or the like can be used. Further, various organic and inorganic surface treatments can be applied to the white pigment for the purpose of improving dispersibility and the like. In particular, in the white pigment, since titanium oxide has a high refractive index and high whiteness in a small amount, it is preferable. When the fluorescent whitening agent is further used, whiteness can be further improved, which is preferable. -11 - 201132499 The content of the white pigment in the white polyester film is preferably from 5% by mass, particularly preferably from 8% by mass, from the viewpoint of light reflectivity. Further, from the viewpoint of film formation stability, the upper limit of the content of the white pigment is preferably 3 〇 mass ° / β ', more preferably 25 mass%, and particularly preferably 2 mass%. In addition, in order to further improve the whiteness, when the fluorescent whitening agent is used in addition to the white pigment in the substrate, 'if the white pigment is more than 3% by mass, the amount of ultraviolet light absorbed by the white pigment increases, and the fluorescence increases. The ultraviolet light which is necessary for the whitening agent to be effective is reduced, and the fluorescent whitening effect is remarkably hindered, so that the whiteness is lowered, and thus it is not preferable. In addition, in order to impart other functions to the white polyester film, inorganic particles having an average particle diameter smaller than that of the white pigment, heat-resistant organic particles, an antioxidant, a crosslinking agent, an ultraviolet absorber, and plasticization may be contained in the substrate as needed. Agents, etc. Further, it is also preferred that the white polyester film contains a white pigment and at least one inorganic particle having an average particle diameter larger than the white pigment. The inorganic particles are white pigments including titanium oxide, barium sulfate, zinc oxide, zinc sulfide, calcium carbonate, or the like, or inorganic particles having a small refractive index difference from polyester such as cerium oxide. Further, when two white pigments having different average particle diameters are used, the white pigments may be the same or different species. In summary, from the viewpoint of light reflectivity and workability, a preferred mode is to use two kinds of inorganic particles having different average particle diameters, and the inorganic particles having a small average particle diameter are white pigments. From the viewpoint of cost or workability, the inorganic particles having a large average particle diameter are preferably sand dioxide. -12- 201132499 It is important that the upper limit 平均 of the average particle diameter of the inorganic particles contained in the white film is 5. From the viewpoint of the appearance of the post-processing, it is preferably 3. 〇vm, particularly preferably 2. 〇Mm. Further, from the viewpoint of the slipperiness of the film production in the post-processing step, the lower limit 平均 of the average particle diameter of the inorganic particles in the base film is preferably 0.5 m, particularly μ.m. The white polyester film can be a single layer or a plurality of layers. For example, if the layer of white pigment and/or inorganic particles is layer A and the other layer is layer I, then A/B/A, A/B/C, C/A/B/A, C/A can be selected. /B/A/C and other layers. In particular, the three-layered structure having the B/A/B layer can be such that the layer B does not contain particles or further enhances light reflectivity. The layer A contains white pigments, inorganic particles, heat-resistant members, and the like. Further, in order to further improve the whiteness, the layer B may contain a fluorescent whitening agent without impairing the efficacy of the present invention. Further, the white polyester film is preferably obtained by containing a thermoplastic resin which is incompatible with the polyester resin as a void forming agent and extending at least in one direction to form voids. The polyester film has a thickness of 20 to more preferably 25 to 450 / / m, and more preferably 30 to 300 (when the thickness of the substrate is thin, the effect of heat shrinkage is large, and high temperature and high humidity treatment may be possible. When the thickness is reduced, it is wound into a roll. The color polyester 0 is m, the step and the contained I are 0.7, and the layer, C ' C/A/B, then The resin is compatible with the organic particles, and the film 5 0 0 // m m 0 is not able to pass through -13 - 201132499 (coating layer) The easy-adhesive polyester film for solar cells of the present invention is characterized by A urethane resin containing an aliphatic polycarbonate polyol as a constituent component. In particular, when the coating layer is a urethane resin containing an aliphatic polycarbonate polyol as a constituent component as a main component It is important to use infrared light In the measurement of the method, the ratio of the absorbance (A146()) in the vicinity of 146 〇cm·1 derived from the aliphatic polycarbonate component to the absorbance (Ai5SQ) in the vicinity of 1530 cm·1 derived from the urethane component (Ai46〇/Ai53Q) is 〇·7〇 to 1.60. In addition, when the coating layer is a urethane resin containing a fatty polycarbonate polyol as a constituent component and a crosslinking agent as a main component, it is important. In the infrared spectroscopy spectrum, the absorbance (A146C) from the vicinity of 1460 cm·1 of the aliphatic polycarbonate component and the absorbance near the 1530 〇111-1 derived from the urethane component (eight 153). The ratio (eight 146 () / person 1530) is from 0.50 to 1.55. The term "principal component" as used herein means that the total solid content contained in the coating layer is 50% by mass or more and more preferably 70% by mass. As disclosed in the above-mentioned Patent Documents 1 to 4, it has been considered from the prior art that it is preferable to positively introduce a crosslinked structure to form rigidity when forming a coating layer from the viewpoint of improving the durability of the coating layer. And a tough coating layer. However, the present invention finds that The aliphatic polycarbonate polyol as a constituent component of the polyurethane resin is controlled so that the absorbance by infrared spectroscopy is within a certain range, and the strong adhesion can be exhibited, and the high temperature and high heat of the heat can be improved. The present invention has finally been achieved with the remarkable effect of the following. The mechanism by which the adhesion can be improved by such a configuration is not clear, but the inventors of the present invention have the following points. For example, when the module is assembled, Then, thermocompression bonding is performed at a high temperature under a configuration in which a polyester film (coating layer) having a glass substrate/sealing material/coating layer is laminated. At this time, stress is generated between the polyester film (coating layer) and the sealing material due to heat shrinkage of the polyester film at the time of high temperature. In particular, the generation of such stresses may also vary depending on the type of sealing material and the conditions of the various sealing materials. As a result, it has been considered that the stress cannot be completely alleviated and the adhesion to the sealing material is lowered. Further, when such a laminate is placed under high temperature and high humidity, the coating layer is deteriorated by hydrolysis. As a result, it has been considered that the stress cannot be completely withstood and the sealing material is peeled off, so that the adhesion under high temperature and high humidity is lowered. Therefore, in order to maintain the strong adhesion to the sealing material or the adhesion under high temperature and high humidity, the durability is not merely imparted by strongly crosslinking the coating layer, but it is preferable to maintain A component that is resistant to heat and hydrolysis, and has a softness that can withstand the stress. However, when it is only flexible, there is a problem in the strength of the coating film. Therefore, it is optimal to make both of these opposite characteristics coexist. In the present invention, the coating layer is mainly composed of a urethane resin having an aliphatic polycarbonate polyol as a constituent component, and is derived from an aliphatic polycarbonate as measured by infrared spectroscopy. The ratio of the absorbance (A146Q) near the composition of 460 cnT1 to the absorbance (Ai53Q) near the 1530 CO! 1 of the urethane component (Ai46〇/Ai53Q) is 〇·70

S -15- 201132499 to 1.60, by which both of the above characteristics can coexist. In other words, the aliphatic polycarbonate component having hydrolysis resistance and the urethane component which exhibits toughness are coexisted in a specific ratio, and both of the above characteristics are exhibited. Thereby, since the stress generated by the heat shrinkage of the polyester film when the heat is subsequently performed at a high temperature can be alleviated, the strong adhesion to the sealing material can be obtained, and it can also be used in the high-temperature and high-humidity environment thereafter. Since heat resistance and hydrolysis resistance are maintained, deterioration of the coating layer can be prevented. Among them, the absorbance (A146D) in the vicinity of 1460 cnT1 is derived from the deformation vibration characteristic of the C-H bond of the methylene group contained in the aliphatic polycarbonate component. Therefore, the absorbance (A146Q) in the vicinity of 1460 cm·1 is the amount of the aliphatic polycarbonate polyol component constituting the urethane resin depending on the coating layer. On the other hand, the absorbance (A153{) in the vicinity of 1530 (^1^1) is derived from the deformation vibration unique to the N-H bond contained in the urethane component. Therefore, the absorbance (A153C&gt;) in the vicinity of 1530 cm·1 is the amount of the urethane component constituting the urethane resin depending on the coating layer. Therefore, these absorbance ratios (A146Q/A153Q) are those in which two components each having different characteristics coexist in a specific ratio. In the present invention, the ratio (Ai46〇/A153.) is 0.70 to 1.60 as described above, but the lower limit of the ratio (Ai46〇/Ai530) is preferably 0.75, more preferably 0.80. Further, the upper limit of the ratio (A146〇/A15 30 ) is preferably 1.50, more preferably 1.45, still more preferably 1.40. If the ratio (Ai46〇/Ai530) is less than 〇.7〇, the tough urethane component becomes too much and the stress of the coating layer is moderately lowered, so that the heat resistance of the coating layer is resistant to -16-55 201132499 reduce. Further, when the ratio (A146()/AI53Q) is more than 1·, the aliphatic component of the soft aliphatic polycarbonate is excessively increased to lower the strength of the coating layer, so that the film strength or the moist heat resistance is lowered. According to the present invention, the adhesion to the sealing material can be exhibited by the above-described mode, so that the adhesion (moisture resistance) under high temperature and high humidity can be improved. Hereinafter, the constitution of the present invention will be described in detail. Further, when the coating layer is a urethane resin containing a fatty polycarbonate polyol as a constituent component and a crosslinking agent as a main component, it is derived from an aliphatic condensing spectrum set in an infrared spectroscopy spectrum. The ratio of the absorbance of the carbonate to 1 460 cnT1 (A146Q) to the absorbance of the urethane 1530 (the absorbance near the ^_1 (eight 153 〇) (human 146 () / 八 1) is 0.50 to 1.55 In this way, both of the above characteristics can be coexisted, and versatility which can be widely applied to various sealing materials can be achieved. In terms of sealing materials, from the viewpoint of improving productivity or preventing deterioration, it has been advanced. The species is composed of a compound containing a crosslinking agent, an ultraviolet absorber, etc. For example, the sealing material belonging to the standard curing type is subjected to thermocompression bonding (for example, after 90 to 13 CTC for 5 to 10 minutes). Heat treatment (for example, at 140 to 160 ° C for 30 to 50 minutes) to cause the sealing material to slowly harden. On the other side, in the case of a fast curing type sealing material, hot pressing is performed in a short time ( For example, at 1 40 to 1 60 °C 1 5 to 20 minutes) in order to make the sealing fast harden the subsequent conditions. Therefore, it is not only required to be used for various sealing and low-strength heat is divided into 5 3 0. 201132499 will also show the versatility of the same degree of adhesion, and also requires a highly versatile easy-adhesive film that can be used for various subsequent conditions. On the other hand, in the case of thermocompression bonding, the heat accompanying the film The stress generated by the shrinkage also varies depending on the type of the various sealing materials and the subsequent conditions. Especially for the standard curing type which requires a long time of high temperature, the stress change caused by the heat shrinkage will increase. As a result, when various sealing materials are applied, there is a case where the stress cannot be completely alleviated, and the adhesion to the sealing material is lowered. Particularly, when high-temperature thermocompression bonding is performed in a short time as in the rapid curing type, The sealing material partially melted on the coating layer will be eroded, in particular, the adhesion to the film substrate after the high temperature and high humidity treatment is lowered. Therefore, it is preferred to use a crosslinking agent. The crosslinked structure of the coating layer is stronger, and at the same time, the opposite characteristics are both coexisted. In the present invention, the coating layer is crosslinked with a urethane resin having an aliphatic polycarbonate polyol as a constituent component. The agent is a main component, and the absorbance (A146Q) near the 1 460 cnT1 derived from the aliphatic polycarbonate component and the 1 5 3 0 CHT1 derived from the urethane component are determined by infrared spectroscopy. The ratio of the nearby absorbance (A153Q) (A146Q/A153Q) is 0.50 to 1.55, whereby both of the above characteristics can coexist. Although the ratio (Ai46〇/A_i53Q) is 〇·50 to 1.55', the ratio (Ai46) The lower limit of 〇/Ai530 ) is preferably 0.60, more preferably 0.70. Further, the upper limit of the ratio (Ai46〇/A153〇) is preferably 1.45, more preferably 1.35, still more preferably 1.25. Thereby, since the heat can be thermally cured at a high temperature, the stress generated by the heat shrinkage of the film can be alleviated, even for various sealing materials, and then the condition -18-201132499 can obtain strong adhesion, and In the high temperature and high humidity environment, the heat resistance and hydrolysis resistance are maintained, so that the deterioration of the coating layer can be prevented. The reason why the preferred ratio range is changed by the crosslinking agent is due to an increase in the crosslinking point of the agent. (urethane resin) The urethane resin of the present invention contains at least a polyol component, an isocyanate component as a constituent component, and may contain a growth agent if necessary. The urethane resin of the present invention is a polymer compound obtained by copolymerizing a main urethane bond of these constituent components. In the present invention, an aliphatic polycarbonate polyol is used as a component of a urethane resin. A urethane resin containing an aliphatic polycarbonate polyol as a component is contained in the coating layer of the present invention, i.e., has high heat and humidity resistance. Further, the constituent components of these urethane resins can be confirmed by nuclear magnetic resonance analysis or the like. The component which is a constituent component of the urethane resin of the present invention is required to contain an aliphatic polyester polyol which is excellent in heat resistance and hydrolysis resistance. From the prevention of yellowing due to sunlight by the present invention, it is preferred to use an aliphatic polycarbonate polyol. The "aliphatic polycarbonate polyol" includes, for example, an aliphatic acid ester diol or an aliphatic polycarbonate triol, but a family of polycarbonate diols is suitably used. The aliphatic polycarbonate diol of the present invention as a component of the urethane resin includes, for example, by making ethylene propylene glycol 1,3-propanediol, 1,4-butanediol, 1,5- The pentanediol, 3- can also be cross-linked, and the poly-chain segment should be structured as a structure. It can be formed from the viewpoint of carbonation to form a carbon-fat to form a diol methyl-19-201132499-1,5-penta Alcohol, 1,6-hexanediol, 1,9-nonanediol, 1,8-nonanediol, neopentyl glycol, diethylene glycol, dipropylene glycol, I,4·cyclohexanediol, 1, An aliphatic polycondensation obtained by reacting one or two or more kinds of glycols such as 4-cyclohexanedimethanol with a carbonate such as dimethyl carbonate, diphenyl carbonate, ethyl carbonate, phosgene or the like Carbonate diol and the like. The number average molecular weight of the aliphatic polycarbonate diol is preferably from 1,500 to 4,000, more preferably from 2,000 to 3,000. When the number average molecular weight of the aliphatic polycarbonate diol is small, the ratio of the aliphatic polycarbonate component constituting the urethane resin is relatively small. Therefore, in order to control the ratio (A t 4 6 Q / A t 5 3 〇 ) to be in the above range, it is preferred to control the number average molecular weight of the aliphatic polycarbonate diol to be in the above range. When the number average molecular weight of the aliphatic polycarbonate diol is large, since the absorbance (Al46G) in the vicinity of 1460 cm·1 originating from the aliphatic polycarbonate component increases, the aliphatic component increases, which may result in Subsequent or reduced strength after high temperature and high humidity treatment. If the number average molecular weight of the aliphatic polycarbonate diol is small, since the tough urethane component is increased, there is a possibility that the stress due to the heat shrinkage of the substrate cannot be alleviated, and the adhesion is lowered. Case 0 Polyisocyanate as a constituent component of the urethane resin of the present invention is an aromatic diisocyanate including, for example, a decyl diisocyanate; isophorone diisocyanate and 4,4-bicyclo An alicyclic diisocyanate such as hexylmethane diisocyanate or L 3 -bis(isocyanatomethyl)cyclohexane; hexamethylene diisocyanate; and 2,2,4-trimethylhexamethylene Isocyanic acid-20-201132499 An aliphatic diisocyanate such as vinegar; a polyisocyanate obtained by adding these compounds in advance or separately with methyl propylpropane or the like. If an aromatic isocyanate is used, it may be unfavorable due to the problem of yellowing. Further, as compared with the aliphatic system, it becomes a tough coating film, which may cause a decrease in the adhesion due to the heat shrinkage of the substrate. "Segment growth agent" is a glycol including, for example, ethylene glycol, diethylene glycol, 1,4-butanediol, neopentyl glycol, and 1,6-hexanediol; glycerin, trishydroxyl Polyols such as propane and neopentyl alcohol; diamines such as ethyl diamine, hexamethylene diamine, and pipe trap; amine alcohols such as monoethanolamine and diethanolamine; sulfur Sulphur diethylene glycol such as ethylene glycol: or water. However, when a chain extender having a short main chain is used, there is a possibility that the absorbance (Α153〇) in the vicinity of 1530 cm·1 from the urethane component is increased, and the flexibility of the coating layer is lowered. . Therefore, the segment growth agent is preferably the main chain for the elderly. Further, from the viewpoint of imparting flexibility to the coating layer, a chain extender of a diol or a diamine which is aliphatic and has a carbon number of 4 to 10 in the main chain is preferable. From such a viewpoint, the segment growth agent used in the present invention is preferably 1,4-butanediol, 1,6-hexanediol, hexamethylenediamine or the like. In other words, in order to prevent the absorbance from the vicinity of 1 530 cnT1 derived from the urethane component from being lowered and imparting flexibility, it is preferred to use 1,4-butanediol or 1,6-hexanediol. A straight chain of hexamethylenediamine or the like has a large molecular weight. The coating method of the coating layer of the present invention is not particularly limited, and various coating methods in the production line or in the production line can be employed. However, from the viewpoint of productivity or environmental protection, it is preferred that the coating layer of the present invention is a coating liquid using a water system, and is provided in a production line coating method to be described later. At this time, the urethane resin of the present invention is preferably water-soluble. Further, the above "water-soluble" means an aqueous solution which is soluble in water or contains less than 50% by mass of a water-soluble organic solvent. In order to impart water solubility to the urethane resin, a sulfonic acid (salt) group or a carboxylic acid (salt) group may be introduced (copolymerized) into the urethane molecular skeleton. Since the sulfonic acid (salt) group is strongly acidic and it is difficult to maintain moisture resistance due to its hygroscopic property, it is preferred to introduce a weakly acidic carboxylic acid (salt) group. Further, a nonionic group such as a polyoxyalkylene group may be introduced. In order to introduce a carboxylic acid (salt) group into a urethane resin, for example, as a polyol component, a polyol compound having a carboxylic acid group such as dimethylolpropionic acid or dimethylolbutyric acid is introduced as a copolymer component. And neutralized with a salt forming agent. Specific examples of the "salt forming agent" include trialkylamines such as ammonia, trimethylamine, triethylamine, triisopropylamine, tri-n-propylamine, and tri-n-butylamine; N-alkylmorpholine such as N-methylmorpholine or N-ethylmorpholine; N-dialkylalkanolamines such as N•dimethylethanolamine and N-diethylethanolamine. These can be used alone or in combination of two or more. In the case where a polyol compound having a carboxylic acid (salt) group is used as a copolymerization component for imparting water solubility, assuming that the total polyisocyanate component of the urethane resin is 100% by mole, the aminocarboxylic acid is used. The composition of the polyol compound having a residual acid (salt) group in the ester resin is preferably from 3 to ό〇 mol%, more preferably from 5 to 40 mol%. If the composition molar ratio is less than -22 - 201132499 3 mole %, there is a possibility that water dispersibility becomes difficult. Further, when the composition molar ratio is more than 60% by mole, there is a possibility that the wet heat resistance is lowered to be low due to a decrease in water resistance. The glass transition point temperature of the urethane resin of the present invention is preferably lower than 0 ° C, more preferably lower than -5 ° C. When the glass transition point temperature is lower than 0 ° C, the viscosity is close to that of the olefin resin such as EVA or PVB which is locally melted at the time of pressurization, and the strong adhesion is obtained by local mixing. There is a contribution, and from the viewpoint of stress relaxation of the coating layer, it is easy to obtain suitable flexibility, and therefore it is preferable. The urethane resin of the present invention may also introduce a crosslinking group into the resin itself in order to improve the adhesion under high temperature and high humidity. The stanol group is preferred from the viewpoint of the stability over time of the coating liquid or the crosslinking density. A resin other than the urethane resin of the present invention may be contained for the purpose of improving the adhesion. The system includes, for example, a polyether or a urethane resin having a polyester as a constituent component, an acrylate resin, a polyester resin or the like. (Additive) In the present invention, the coating layer can simultaneously contain the aforementioned urethane resin and a crosslinking agent as main components. By containing a crosslinking agent, the adhesion under high temperature and high humidity can be further improved. Further, in the case where the high-temperature thermocompression bonding is performed in a short time, it is possible to prevent the substrate adhesion from being lowered due to the erosion of the EVA. Therefore, it is possible to achieve easy adhesion of high versatility which can be matched in various subsequent conditions. Since the crosslinking agent is not easily deteriorated by high-temperature and high-humidity treatment, it can be reacted with a carboxylic acid group, a hydroxyl group, an amine group or the like to form a guanamine bond-23-201132499, a urethane bond, and a urea bond. Preferably. On the other hand, when it is accompanied by an ester bond or an ether bond, it may be hydrolyzable, which is not preferable. The crosslinking agent suitable for use in the present invention includes melamine-based, isocyanate-based, carbodiimide-based, oxazoline-based, and the like. Among these, an isocyanate-based or carbodiimide-based system is preferred from the viewpoints of the stability of the coating liquid and the effect of improving the adhesion under high-temperature and high-humidity treatment. Further, from the viewpoint of obtaining moderate flexibility from the coating layer and appropriately imparting a stress relieving action to the coating layer, it is particularly preferable to use an isocyanate crosslinking agent. Further, in order to promote the crosslinking reaction, a catalyst or the like may be appropriately used as needed. The content of the crosslinking agent is preferably 5% by mass or more and 90% by mass or less, and more preferably 10% by mass or more and 50% by mass or less based on the urethane resin. When the amount is small, the strength of the coating layer is lowered under high temperature and high humidity, and the adhesion is lowered. When the amount is too large, the flexibility of the resin of the coating layer is lowered, and the adhesion at normal temperature, high temperature and high humidity is lowered. Case. In the present invention, two kinds of crosslinking agents may be blended in order to increase the film strength. Further, in order to promote the crosslinking reaction, a catalyst or the like may be suitably used as needed. In the present invention, particles may be contained in the coating layer. The particles are: (1) cerium oxide, kaolinite, talc, light calcium carbonate, heavy calcium carbonate, zeolite, alumina, barium sulfate, carbon black, zinc oxide, zinc sulfate, zinc carbonate, titanium dioxide, satin Inorganic particles such as white, aluminum silicate, diatomaceous earth, calcium citrate, aluminum hydroxide, hydrated halloysite, magnesium carbonate, magnesium hydroxide, etc.; (2) acrylate or methacrylate, vinyl chloride , vinyl acetate-24- 201132499 ester, nylon, styrene/acrylic, styrene/butadiene, polystyrene/acrylic, polystyrene/isoprene, polystyrene/different Ethylene methacrylate, methyl methacrylate/butyl methacrylate, melamine, polycarbonate, urea, epoxy, urethane, phenol, diallyl phthalate Organic particles such as esters and polyesters. The particles preferably have an average particle diameter of from 1 to 50 〇 11111. The average particle diameter is not particularly limited, and from the viewpoint of maintaining the transparency of the film, it is preferably from 1 to 100 nm. The particles may contain two or more kinds of particles having different average particle diameters. In addition, the above average particle diameter is a cross section of a laminated film formed by a transmission electron microscope (TEM) at a magnification of 120,000 times, and the maximum diameter of particles existing in the cross section 10 or more of the coating layer is measured. The average is eager to find. The content of the particles is preferably 0.5 mass. /〇 is above 20% by mass. If it is small, sufficient blocking resistance cannot be obtained. In addition, it can also cause scratch resistance to deteriorate. If it is too much, the film strength is lowered. The coating layer may contain a surfactant for the purpose of improving the leveling property at the time of coating and defoaming of the coating liquid. The surfactant may be any of a cationic system, an anion system, and a nonionic system, and is preferably an anthracene-acetylene glycol-based or fluorine-based surfactant. The surfactant may be contained in the coating liquid in a range of, for example, 00 00 5 to 0.5% by mass insofar as it does not impair the adhesion to the sealing material. -25- 201132499 In order to impart other functional properties to the coating layer, various additives may be contained in such a range as not to impair the adhesion to the sealing material. The additive includes, for example, a fluorescent dye, a fluorescent whitening agent, a plasticizer, a UV absorber, a pigment dispersant, a suds suppressor, an antifoaming agent, a preservative, an antistatic agent, etc. In the present invention, The method of providing a coating layer on a polyester film is a method of coating and drying a coating liquid containing a solvent, a particle, and a resin on a polyester film. The solvent is an organic solvent including toluene or the like, water or a mixture of water and a water-soluble organic solvent. From the viewpoint of environmental problems, it is preferred that water be mixed with water-soluble organic solvent alone or in water. (Production of the easy-adhesive polyester film for solar cell) The method for producing the optically easy-contact polyester film of the present invention is polyethylene terephthalate (hereinafter, simply referred to as "PET"). The film is exemplified as follows, and of course, it is not limited to these. After the PET resin is sufficiently vacuum-dried, it is supplied to an extruder, and a molten PET resin of about 280 ° C is melt-extruded into a rotary cooling roll by a T-die, and electrostatically applied (electrostatic application) Method) Cooling and curing to obtain an unstretched PET sheet. The unstretched PET sheet may be composed of a single layer or a composite layer using a coextrusion method. The obtained unstretched PET sheet was stretched 2.5 to 5.0 times in the longitudinal direction by a roll heated to 80 to 120 ° C to obtain a uniaxially stretched PET film. Further, the end of the film is held by a jig and introduced into a hot air zone heated to 70 to 140 ° C and extended 2.5 to 5.0 times in the width direction. In the heat treatment zone of 160 to 240 ° C, a heat treatment of 1 to 60 is carried out to complete the crystallization alignment. At any stage of the film production step, the coating liquid is applied to one side of the PET film to form a coating layer as described above. There are no particular problems with the coating layer on both sides of the PET film. The solid content concentration of the composition in the coating liquid is preferably from 2 to 35 % by weight, particularly preferably the weight % / p. The method for applying the coating liquid to the PET film is any method which can be used. For example, reverse roll coating method, gravure rotary type, staple coating method, die coater method, roll brush method, spray method, air knife coating method, wire bar coating method, tubular blade method, and soaking Coating method, curtain coating method, etc. These methods or combinations are applied. In the present invention, the coating layer is applied to the coating liquid in an unstretched or uniaxially stretched PET film, and after drying, at least toward a single axis The square extension is followed by heat treatment. The film formation by the coating method is carried out by a coating method on the production line, so that the adhesion between the layer and the polyester film substrate can be further improved, so that the temperature can be increased. In the present invention, the thickness of the finally obtained coating layer is preferably 3,000 nm, more preferably 10 to 1000 nm, still more preferably 10 to 10, particularly preferably. The thickness of the coating layer is preferably from 0.01 to 3 g/m2, more preferably from 〇1 to 1 g/m2, and at least one second of the formation of the resin group 4 to 1 5 Coating the Doctor with a conventional coating method In the case of high coating, the coating amount of 10 to 500 nm is preferably -27-201132499, 0.01 to 0.5 g/m2, and particularly preferably 0.01 to 0.4 g/m2. If the coating amount of the coating layer is less than 〇.〇1 g/m2, the effect on the adhesion is almost eliminated. On the other hand, when the coating amount is more than 3 g/m2, the blocking resistance is lowered (the back sheet for a solar cell). The back sheet for a solar cell of the present invention is constituted by a polyester film having the above-mentioned coating layer. member. In particular, it is preferably used in the outermost layer in direct contact with the sealing material. According to such a configuration, the back sheet for a solar cell of the present invention can achieve strong adhesion to the sealing material, and good adhesion can be achieved even in a long-term strict environment. Therefore, it is possible to contribute to the moisture resistance of the solar battery element or to improve the barrier property. The form of the back sheet for a solar cell of the present invention is exemplified by, for example, a polyester film/adhesive having the coating layer/film/adhesive/polyvinyl fluoride film or polyester having a metal foil or a metal film layer. The composition of the durable moisture-proof film. Further, the polyester film of the present invention may have a constitution in which the coating layer is provided on both sides. The coating layer of the present invention can also achieve good adhesion to a structure other than the sealing material. Here, a film having a metal foil or a metal film layer can be suitably used for those having water vapor barrier properties. The type of the metal described above includes aluminum, tin, magnesium, silver, stainless steel, etc. Among them, aluminum and silver are particularly preferable because they have a high reflectance and can be easily obtained industrially. The metal layer can be formed into a metal foil and can be formed into a film and laminated on a polyester film or the like. A method of laminating these metals into a thin film can be carried out by vacuum deposition, sputtering, ion plating, plasma chemical vapor deposition (CVD) or the like. -28- 201132499 In the present invention, it is possible to use between a polyester film having the above-mentioned coating layer, a film having a metal foil or a metal film layer, a polyvinyl fluoride film or a polyester-based high-duty moisture-proof film, A general molding method such as a lamination method in which vacuum suction or the like is integrated and subjected to thermocompression bonding, and the above-mentioned respective layers are integrally molded and subjected to thermocompression bonding to produce a solar cell back sheet. In this case, in order to improve the adhesion between the respective films, it is preferred to laminate the layers by means of an adhesive. The adhesive agent is a hot-melt type adhesive, a solvent-based adhesive, and a photo-curing type, which are, for example, a (meth)acrylic resin, an olefin resin, a vinyl resin, or the like, which is a main component of a resin as a vehicle. Agents, etc. The so-called "high-endurance moisture-proof film" is a laminate for the purpose of improving weather resistance, and the high-durability moisture-proof film includes, for example, polytetrafluoroethylene (PTFE), tetrafluoroethylene-perchloroalkoxy copolymer. (PFA), tetrafluoroethylene/hexafluoropropylene copolymer (FEP), ethylene-tetrafluoroethylene copolymer (ETFE), polychlorotrifluoroethylene (PCTFE), polyvinylidene fluoride (PVDF), or polyvinyl fluoride a fluororesin film of (PVF) or the like, or by polycarbonate, polymethyl methacrylate, polyacrylate, polyethylene terephthalate (PET), polyethylene naphthalate ( PEN), a film composition composed of a resin composition obtained by kneading a UV absorber in a resin such as acrylate, and a solar cell module, for example, a glass substrate and a wiring as a light-emitting element The solar cell element is composed of a sealing material inserted in a state in which the solar cell -29-201132499 element is caught, and a solar cell back sheet of the present invention. The blocking agent is preferably an olefin resin such as an ethylene-vinyl acetate copolymer or a polyvinyl butyral resin. In particular, since the coating layer of the present invention has the flexibility as described above, good adhesion can be achieved with, for example, an ethylene-vinyl acetate copolymer or a polyvinyl butyral resin sealing material. The sealing material is a standard curing type which can be classified into: a hardening reaction by a curing step of an oven provided in another production line after thermocompression bonding in a lamination step; and a rapid curing reaction in which a hardening reaction is performed inside the laminating machine of the laminating step Type, but either can be applied. The main component of the sealing material is an olefin resin such as an ethylene/vinyl acetate copolymer or a polyvinyl butyral resin. In addition, the term "main component" as used herein means that the sealing agent contains 50% by mass or more, and more preferably 70% by mass or more. Therefore, for example, a crosslinking agent, a reaction initiator, or the like may be added to carry out the crosslinking reaction. For example, when performing thermal crosslinking, 2,5-dimethylhexane-2,5-dihydroxy peroxide, 2,5-dimethyl-2,5-di(tributyl) can be used. Peroxy)hexyne-3, di-tertiary butyl peroxide, tertiary butyl cumyl peroxide, 2,5-dimethyl-2,5-di(tributyl) An organic peroxide such as oxy)hexane. Further, when photocuring is carried out, a photo sensitizer such as benzophenone, methyl phthalate or benzoin ether can be used. Further, it is also conceivable to blend a decane coupling agent with the glass substrate. There are also cases in which blending for the purpose of promoting adhesion and hardening, and an epoxy group-containing compound can be used: ginseng (2-hydroxyethyl) isocyanuric acid triglycidyl ester, neopentyl glycol di-30 - 201132499 An epoxy group-containing compound such as glycidyl ether, 1,6-hexanediol diglycidyl ether, propylene glycidyl ether or 2-ethylhexyl glycidyl ether. <<Embodiment>> Next, the present invention will be described in detail using examples and comparative examples, but the present invention is not limited to the examples below. Further, the evaluation method used in the present invention is as follows. (1) The intrinsic viscosity is in accordance with JIS K 73 67-5, and the solvent is a mixed solvent of phenol (60% by mass) and 1,1,2,2-tetrachloroethane (40% by mass) at 30 °C. The measurement was carried out. (2) Apparent density of the film The film was cut into four squares of 5 cm square as a sample. Four sheets were laminated, and the thickness thereof was measured using a micrometer to change the position by any significant number of four digits, and the average thickness of the laminated thickness was calculated. The average is divided by 4 and rounded to a significant number of 3 digits as the average thickness (t: β m ) of each slice. The mass (w: gram) of the four samples was measured using a four-digit effective number using an automatic weighing scale, and the apparent density was calculated by the following formula. In addition, the apparent density is the effective number of 3 digits: apparent density (g/cm3) = (wxi〇4) / (5.〇〇X5.〇〇x4xt). <PD 1 1 07 1 8 7 008 5>

-31 - 201132499 (3) Hue The film was cut into squares of 5 cm squares. The composite was 25 〇 / ζ π1 or more and Lab was expressed as l値, a値 and b値 of the system. (Measurement conditions) Clothing, color difference, day 10, Nippon Denshoku Industrial Co., Ltd. (Nipp〇nDenshoku

ZE-2000 manufactured by Industries Co., Ltd. Determination method: Reflected standard light: C light source viewing angle: 2 degrees (4) Glass transition point temperature According to JIS K7121 guidelines, using differential scanning calorimeter (Seiko Instruments Co., Ltd. (DSC6200, manufactured by Seiko Instruments Inc.), the glass transition starting temperature was determined from the DSC curve. (5) Measurement of absorbance by infrared spectroscopy A sample of about 1 mg was taken for the obtained adhesive film for solar cell obtained by peeling off the coating layer. A film-like coating layer sample piece (size: about 50/zmx and about 50 μm) formed into a film having a thickness of about lym was produced by applying pressure to the sample to be taken. Further, a sample piece (a blank sample piece) was produced in the same manner as described above for the PET resin which is the same as the base film as a blank sample. The prepared test piece was placed on a KBr plate, and the infrared absorption spectrum was measured by a microscopic transmission method under the following conditions. The infrared spectroscopy spectrum of the coating layer was measured as the spectral difference between the infrared spectroscopy spectrum obtained from the coating layer sample piece and the spectrum of the blank sample piece. -32- 201132499 It has an absorption peak height 吸收 in the region of 1460±10 cnT1 as the absorbance (A146g) near the 1 460 cm·1 of the aliphatic polycarbonate component, and absorption in the region of ISSOilOcnr1 The maximum absorption peak height 作为 is derived from the absorbance (A153Q) near the 1 5 3 0 cnT1 of the urethane component. In addition, the line connecting the hem of each of the maximal absorption peaks is used as the baseline. The absorbance ratio was calculated from the obtained absorbance by the following formula: (absorbance ratio) = A146Q/A1530. (measurement conditions)

Device: FT-IR analyzer: IR β s/SIRM detector manufactured by SPECTRA TECH: MCT decomposition energy: 4 cnT1 Total number of calculations: 128 times (6) Adhesive preparation for easy-to-adhere white polyester for solar cells The film is cut into 100 mm wide x 100 mm long, and the EVA sheet is cut into 70 mm wide X 90 mm long and laminated with a film (coating layer) / EVA / (coated layer) film as described below, and then The sample was produced by hot press bonding using a vacuum laminator under the following conditions. The prepared sample was cut into a length of 20 mm width x 100 mm, attached to a SUS plate, and the peel strength of the film layer and the EVA layer was measured using a tensile tester under the following conditions. The peel strength is measured as the average enthalpy of the portion which is stably peeled off after the maximum point. Graded according to the following criteria: -33- 201132499 ◎ : 100N/20mm or more, or the material of the film is broken; 〇: 75 N/20 mm or more and less than 100 N/20 mm; △ : 50 N/20 mm or more Less than 75 N/20 mm; X: Less than 50N/20mm» (Sample manufacturing conditions) Device: Vacuum laminator: LM-3 0X3 manufactured by NPC Incorporated Type 0 Pressurization: 1 Air pressure EVA : A . Standard Curing I. Sunvic Co., Ltd. (Urvla Pearl PV (0.4 /zm)) Lamination step: 100 ° C (vacuum for 5 minutes, vacuum press for 5 minutes) Curing step: heat treatment 150 ° C (Normal pressure 45 minutes) 11 · M its ui C h em ic al s F ab r 〇,In c ·Manufactured SOLAR EVA SC4 ( 0.4 〆m ) Lamination step: 130 °C (vacuum for 5 minutes, vacuum pressurization 5 Minutes) Curing step: 150 ° C (normal pressure 45 minutes) B. Rapid curing type I. Urtla Pearl PV ( 〇.45 μ m) manufactured by Sunvic Company Lamination step: 135 ° C (vacuum for 5 minutes, vacuum pressurization for 15 minutes) )

II. M itsui C hemica 1 s F abr ο,I n c.Manufactured by S Ο LAREVA RC02B ( 0.45^ m ) -34- 201132499 Lamination step: l5〇°C (vacuum for 5 minutes, vacuum pressurization for 15 minutes) Measurement conditions) Device: TENSILON Toyo BALDWIN RTM-1 00 Peeling speed: 200 mm/min Peeling angle: 180 ° (7) Moisture resistance The obtained heat-resistant white polyester film for solar cells is at a high temperature. It was placed in a high-humidity tank at 1000 ° C and 85% RH for 1000 hours. Next, an easy-adhesive white polyester film for a solar cell was taken out and left to stand at room temperature for 24 hours under normal humidity. Thereafter, the peel strength was measured in the same manner as in the above (4), and classified according to the following criteria: ◎ : 100 N/2 0 mm or more, or the material of the film was broken; 〇: 75 N/20 mm or more and less than 100 N/20 mm: △ : 50 N/20 mm or more and less than 75 N/20 mm; X: less than 50 N/20 mm. (Polymerization of urethane resin A-1 having an aliphatic polycarbonate polyol as a constituent component), a mixer, a Dimroth condenser, a nitrogen gas introduction tube, a ruthenium gel drying tube, and In a four-necked flask of a thermometer, 43.75 parts by mass of 4,4-diphenylmethane diisocyanate, 12.85 parts by mass of dimethylolbutanoic acid, and 153.4 parts by mass of a polycarbonate having a number average molecular weight of 2,000 were fed. Methyl diol, 0.03 parts by mass of butyl laurate butyl-35-201132499 tin, and 84.00 parts by mass of acetone as a solvent, stirred under nitrogen atmosphere at 75 ° C for 3 hours' and confirmed reaction The liquid has reached the desired amine equivalent. Next, after the reaction liquid was cooled to 40 ° C, 8.77 parts by mass of triethylamine was added to obtain a polyurethane prepolymer solution. Next, in a reaction vessel equipped with a high-speed disperser capable of high-speed stirring, 450 g of water was fed to adjust to 251: while stirring and mixing at 2000 min·1, the polyurethane prepolymer solution was added thereto. Disperse water. Thereafter, a portion of acetone and water was removed under reduced pressure to prepare a water-soluble polyurethane resin solution (A-1) having a solid content of 35%. The glass transition point temperature of the obtained polyurethane resin (A-1) was -30 °C. (Polymerization of urethane resin A-2 having an aliphatic polycarbonate polyol as a constituent component) A four-neck equipped with a stirrer, a Daimler condenser, a nitrogen gas introduction tube, a hydrazine gel drying tube, and a thermometer In the flask, 29.14 parts by mass of 4,4-diphenylmethane diisocyanate, 7.57 parts by mass of dimethylolbutanoic acid, and 17.3 parts by mass of polyhexamethylene carbonate having a number average molecular weight of 3,000 were fed. The diol, 0.03 parts by mass of butyltin dilaurate, and 84.00 parts by mass of acetone as a solvent are stirred under a nitrogen atmosphere at 75 ° C for 3 hours, and it is confirmed that the reaction liquid has reached the desired amine equivalent. . Next, after the reaction liquid was cooled to 40 ° C, 5 · 17 parts by mass of triethylamine was added to obtain a polyurethane prepolymer solution. Next, 'in a reaction vessel equipped with a high-speed disperser capable of high-speed stirring, feed 450 g of water, adjust to 25 ° C, and mix and mix with 2000 min · 1 while adding polyamine A · 36- 201132499 acid ester The prepolymer solution was water-dispersed. Thereafter, a portion of acetone and water was removed under reduced pressure to prepare a water-soluble polyurethane resin solution (A-2) having a solid content of 35 %. (Polymerization of urethane resin A-3 having an aliphatic polycarbonate polyol as a constituent component) A four-neck equipped with a stirrer, a Dairy condenser, a nitrogen gas introduction tube, a hydrazine gel drying tube, and a thermometer In the flask, 43.7 parts by mass of 4,4-diphenylmethane diisocyanate, 11.12 parts by mass of dimethylolbutanoic acid, 1.97 parts by mass of hexanediol, and 143.40 parts by mass of the number average molecular weight of 2000 were fed. Polyhexamethylene carbonate diol, 0.03 parts by mass of butyltin dilaurate, and 8.00 parts by mass of acetone as a solvent were stirred under a nitrogen atmosphere at 75 ° C for 3 hours, and the reaction solution was confirmed. I have reached the desired amine equivalent. Next, after the reaction liquid was cooled to 40 ° C, 8.77 parts by mass of triethylamine was added to obtain a polyurethane prepolymer solution. Next, in a reaction vessel equipped with a high-speed disperser capable of high-speed stirring, 450 g of water is fed, adjusted to 25 ° C, and stirred while mixing at 2000 min·1, and added to the polyurethane prepolymer solution. And water is dispersed. Thereafter, a portion of acetone and water was removed under reduced pressure to prepare a water-soluble polyurethane resin solution (A_3) having a solid content of 35%. (Polymerization of a stanol group-containing urethane resin A-4 having an aliphatic polycarbonate polyol as a constituent component) A stirrer, a Daimler condenser, a nitrogen gas introduction tube, a ruthenium gel drying tube, And a four-necked flask of a thermometer, fed with 3 8 · 4 1 parts by weight of isophora-37-201132499 keto diisocyanate, 6.95 parts by mass of dimethylolpropionic acid, and 158.99 parts by mass of a number average molecular weight of 2000 Hexamethylene carbonate diol, 0.03 parts by mass of butyltin dilaurate, and 84.00 parts by mass of acetone as a solvent were stirred under a nitrogen atmosphere at 75 ° C for 3 hours, and it was confirmed that the reaction liquid had reached the The desired amine equivalent. Next, 'the reaction liquid was cooled to 4 (after TC, 4.37 parts by mass of triethylamine was added to obtain a polyurethane prepolymer solution. Secondly, 3 to 84 parts by mass of r-(amino group B) was added. Aminopropyltriethoxydecane, 1.8 parts by mass of 2-[(2-aminoethyl)amino]ethanol and 450 g of water, and added dropwise to the polyurethane prepolymer The solution is water-dispersed. Thereafter, by removing a part of acetone and water under reduced pressure, a water-soluble urethane-containing polyurethane resin solution having a solid content of 30% is prepared (A) -4) (Polymerization of urethane resin A-5 having an aliphatic polycarbonate polyol as a constituent) except for the number average molecular weight of the water-soluble polyurethane resin (A-1) The carbonic acid polyamine having a solid content of 35% was obtained in the same manner except that the hexamethylene carbonate diol of 2000 was changed to the hexamethylene carbonate diol having a number average molecular weight of 1 Å. Carbamate resin solution (A-5). Aminocarboxylic acid having an aliphatic polycarbonate polyol as a constituent component Polymerization of Resin A-6) In addition to changing the number average molecular weight of the water-soluble polyurethane resin (A-1) to hexamethylene carbonate diol of 2,000 - 38 - 201132499 In addition to the hexamethylene carbonate diol of 0, the other water-soluble polyurethane resin (A-6) having a solid content of 35% was obtained by the same method. A-7 of the urethane resin of the component, except that the amount of the water-soluble polyurethane resin (A-1) is changed to a quantity average amount of hexamethylene carbonate diol of 2000 In addition to the polyester diol of 2000, the other method is to obtain a water-soluble polyurethane resin solution (A-7) having a body composition of 35% (the amine group with the polyether polyol as a constituent component). A-8 of the acid ester resin, except that the amount of the water-soluble polyurethane resin (A-1), the amount of the carbonic acid hexamethylene glycol diol is changed to a polyether number of 2000 In addition to the alcohol, the other method is to obtain a water-soluble polyurethane resin solution (A-8) having a body composition of 35% ( Aliphatic polycarbonate polyol as the polymerization of the resin component constituting the urethane of A-9)

In a four-necked flask equipped with a stirrer, a Dairy condenser, a nitrogen inlet tube, a sputum drying tube, and a thermometer, '32.39 parts by mass of bis(isocyanatemethyl)cyclohexane, 13.09 parts by mass of dihydroxycarboxylic acid were fed. 156.74 parts by mass of a polymethyl carbonate diol having a number average molecular weight of 2000, 0.03 parts by mass of butyltin dilaurate, and 80.89 parts of acetone as a solvent, in a nitrogen atmosphere and a solution at 75 ° C Polymerization is divided into molecules to obtain a solid-state polymerization, and the molecular weight of the solid is 0. The acid ester is dry and the 1,3- butyl hexaethylene mass is stirred -39-201132499 for 3 hours' and it is confirmed that the reaction liquid has reached the desired amine. After the reaction solution was cooled to 40 ° C, 8.77 mass of an amine was added to obtain a polyurethane prepolymer solution. Next, in a reaction vessel of a high-speed disperser which is rapidly stirred, 450 parts of the mixture was fed at 25 ° C, and the mixture was stirred and mixed with SOOOmin·1, and the urethane prepolymer solution was water-dispersed. Thereafter, a part of acetone and water were removed to prepare a solid polyurethane urethane resin solution (A-9). The glass transition point temperature of the obtained polyurethane (A-9) was -30 °C. (Polymerization of Resin A-10 with Aliphatic Polycarbonate Polycarbonate as a Component) In a four-necked flask equipped with a stirrer, a Dairy condenser, a nitrogen introduction tube, and a thermometer, 45.93 bicyclic rings were fed. Hexyl diisocyanate, 13.09 parts by mass of dihydroxy 23, 51 parts by mass of a polyester diol having a number average molecular weight of 3,000, 0.03 parts by mass of butyltin dilaurate, and 11 of acetone as a solvent in a gaseous atmosphere of nitrogen The next 1 hour, and confirm that the reaction solution has reached my desired &amp; @ stomach, the reaction solution is cooled to 4 (TC, added to 8.77 parts by mass to obtain a polyurethane prepolymer solution. 'In a reaction vessel of a stirred high-speed disperser, feed A 450 &amp; at 25 ° C while stirring and mixing the 'one-side' ester prepolymer solution at 2000 min·1 for water dispersion. Equivalent. The third portion of the triethyl group is added with water of high gram, and the polyamine is added to the polyamine by 35% under water pressure, and the dry weight of the gel is 4, 4-methylbutyric acid, hexamethylene carbonate 7.6 6 parts by mass 7 Stir 3 at 5 °C. Secondly, triethylamine is equipped with high-speed water, adjust the addition of polyamine group under reduced pressure to remove -40-201132499, except acetone and water, to prepare the solid component as polyamine. Formate resin solution (A-1 0 ). The glass transition point temperature of the obtained polyester (A-10) is -40 ° C. (Polymerization of blocked polyisocyanate crosslinker) Equipped with a mixer, thermometer, 100 parts by mass of hexamethylene diisocyanate as a polyisocyanate compound of the original polycyanate structure (manufactured by Asahi Kasei Chemicals Corporation), 55 parts by mass of propylene glycol monomethyl ether acetate, 30 diol monomethyl ether (average molecular weight 750) was maintained at 70 ° C for 4 hours under nitrogen. Thereafter, the temperature of the reaction liquid was dropped dropwise to 47 parts by mass of methyl ethyl ketone oxime. The reaction spectrum was measured to confirm that the absorption of the isocyanate group had disappeared, and that 75 mass% of the blocked polyisocyanate aqueous dispersion (polymerization of the oxazoline-based crosslinking agent) was equipped with a thermometer, a nitrogen gas introduction tube, and a Deer condensation. And a mixer flask, fed with a mixture of sub-exchange water as an aqueous medium and 58 parts by mass of isopropyl alcohol, and a combined initiator (2,2'-azobis(2-amidinopropane)•two other On the one hand, 16 parts by mass of isopropenyl-2-oxazoline as a polymerizable unsaturated monomer, methoxyethyl acrylate (ethylene glycol acrylate), new in the dropping funnel Nakamura Chemical Industry Co., Ltd. (Shin-Nakamura 35% water-soluble urethane bottle flask, the feed material has a different industrialization company (Duranate TP A parts by mass of polyethylene gas and up to 50 °C) And the solid component B) is obtained by liquid-infrared light. The apparatus and the dropping funnel are 5 parts by mass of 4 parts by mass of the polyhydrochloride salt. The polymole of 2-32 parts by mass of the oxazoline group. · 9 Mo Chemical Co. -41 - 201132499

(manufactured by Ltd.) and a mixture of 32 parts by mass of methyl methacrylate, under a nitrogen atmosphere and at 7 (TC dropwise addition for 1 hour. After the dropwise addition, the reaction solution was stirred for 9 hours and It is cooled to obtain a water-soluble resin solution (C) having an oxazoline group having a solid concentration of 40% by mass. (Polymerization of a carbodiimide crosslinking agent) A flask equipped with a stirrer, a thermometer, and a reflux cooling tube In the above, 168 parts by mass of hexamethylene diisocyanate and 220 parts by mass of polyethylene glycol monomethyl ether (M400, average molecular weight 400) were fed, and the mixture was stirred at 120 ° C for 1 hour, and 26 parts by mass was added. 4,4'-dicyclohexylmethane diisocyanate and 3.8 parts by mass (2% by weight based on total isocyanate) of 3-methyl-1-phenyl-2-phosphonium-1-oxide as carbodiimide The catalyst was stirred at 185 ° for 5 hours under a nitrogen stream. The infrared spectrum of the reaction solution was measured to confirm that the absorption of the wavelength 2200 to 2300 cnT1 had disappeared. Naturally cooled to 6 (TC, 56 7 parts by mass of ions were added. Exchange water to obtain a solid content of 40% by mass Carbonized diimide water-soluble resin solution (D) [Example 1] (1) Preparation of coating liquid The following coating agents were mixed to prepare a coating liquid. 5 5 . 8 6 mass % 3 0.0 0 mass % 1 3 . 5 2 mass % 0.5 9 mass % • Water • Isopropanol • Polyurethane resin solution (A-1 ) • Particles -42- 201132499 (矽 sol with an average particle size of 40 nm, solid concentration 4 0 Mass %) Surfactant 0.03 mass ° / 〇 (lanthanum, solid content concentration 100% by mass) (2) The manufacture of the easy-adhesive polyester film for solar cells will be used as a film raw material polymer containing 〇·〇3 mass Nine of the PET resin (intrinsic viscosity: 0.62 dl/g) of cerium oxide particles having an average particle diameter of 2.5 // m was dried at 135 ° C for 6 hours under a reduced pressure of 133 Pa. Thereafter, the supply was continued. The extruder was melted at about 285 ° C. The PET resin was separately filtered with a stainless steel sintered body filter (nominal filtration accuracy of 10 M m particles cut off by 95%), and melt-extruded into a sheet. On a rotating cooling metal roll whose surface temperature is maintained at 30 ° C, it is quenched and cured. Obtaining an unstretched PET sheet. The unstretched PET sheet is heated to 1 〇〇 ° C with a heated roll group and an infrared heater, and then extended by 3.5 times in the longitudinal direction with a roll group having a peripheral speed difference. A uniaxially stretched PET film was obtained. Next, the coating liquid was applied to one side of the PET film by a roll coating method, and then dried at 80 ° C for 20 seconds. In addition, the coating amount was adjusted so that the final (biaxially) After the stretching, the coating amount after drying was 0.15 g/m2 (the thickness of the coating layer after drying was 150 nm). Subsequently, it was extended by 4.0 times in the width direction at 120 ° C by a tenter, and heated at 230 ° C for 0.5 second in the length direction of the fixed film, and was carried out for 10 seconds at 1 〇〇. Relaxation treatment in the width direction of 3 % to obtain an easily connectable polyester film for solar cells of 250 / / m. The evaluation results are shown in Table 1. -43-201132499 [Experimental Example 1] In addition to changing the polyurethane resin to the polyurethane resin (A-5), the solar cell was easily obtained in the same manner as in Example i. A polyester film. [Experimental Example 2] The easy-adhesive polyester for solar cell was obtained in the same manner as in Example 1 except that the polyurethane resin was changed to the polyurethane resin (A-6). film. [Comparative Example 1] The easy-adhesive polyester for solar cell was obtained in the same manner as in Example 1 except that the polyurethane resin was changed to the polyurethane resin (A-7). film. [Comparative Example 2] The easy-adhesive polyester for solar cell was obtained in the same manner as in Example 1 except that the polyurethane resin was changed to the polyurethane resin (A-8). film. [Comparative Example 3] An easy-adhesive polyester film for a solar cell was obtained in the same manner as in Example 1 except that the thickness of the substrate of the easy-adhesive polyester film for a solar cell was changed to 5 #m. -44 - 201132499 [Example 2] The solar cell was easily obtained in the same manner as in the Example except that the polyurethane resin was changed to the polyurethane resin (A-2). Polyester film. [Example 3] An easy-adhesive polyester for solar cell was obtained in the same manner as in Example except that the polyurethane resin was changed to the polyurethane resin (A-3). film. [Example 4] A solar cell was obtained in the same manner as in Example 1 except that the polyurethane resin was changed to the urethane group-containing polyurethane resin (A - 4 ). Easy-adhesive polyester film. [Example 5] An easy-adhesive polyester film for a solar cell was obtained in the same manner as in Example 1 except that the thickness of the substrate of the easy-adhesive polyester film for a solar cell was changed to 50 μm. [Example 6] An easy-adhesive polyester film for a solar cell was obtained in the same manner as in Example 1 except that the thickness of the substrate of the easy-adhesive polyester film for a solar cell was changed to 100 μm. [Example 7] An easy-adhesive polyester film for a solar cell was obtained in the same manner as in Example 1 except that the thickness of the substrate of the easy-adhesive polyester film for a solar cell was changed to 305 mA. -45-201132499 [Example 8] An easy-to-adhesive for solar cell was obtained in the same manner except that the coating liquid was changed to the following: • Water • Isopropyl alcohol • Polyurethane resin solution (A-1) • Particles (a sol with an average particle diameter of 40 nm and a solid concentration of 40% by mass) • Surfactant (tantalum, solid content concentration: 100% by mass) [Example 9] Except that the coating liquid was changed to the following In the same way, obtain the easy adhesion of solar cells. • Water • Isopropyl alcohol • Polyurethane resin solution (A-1 ) • Particles (average particle size 40 nm sol, solid concentration 40 Mass %) • Surfactant (lanthanum, solid content concentration: 1% by mass) [Example 1 〇] (3) The solar cell back sheet was produced in the same manner as in Example 1 polyester film. 6 1 · 5 1 Quality. /. 3 0.0 0 mass% 8 _ 1 1 mass% 〇 · 3 5 mass% 0.03 mass 〇/0 The polyester film of Example 1 was used. 4 1 · 7 1% by mass 3 0.00% by mass 2 7.0 5 mass% 1 · 1 8 mass% 0.06 mass% -46- 201132499 The easy-adhesive polyester I ester film for solar cell of Example 1 (50//m / / Aluminum foil (30 #m) / Polyfluoroethylene thin), and the dry laminate method is followed to obtain the Tai back plate. Dry laminating adhesive TAKELAC A-315 (manufactured by Mitsui Inc.) / ΤΑΚΕΝΑΤΕ A-10 (San Geng Chemical Co., Ltd. | (solid content ratio) [Example 1 1] except for polyaminocarboxylic acid The epoxy resin film was changed to the polyaminomethyl group A-9), and the battery-adhesive polyester film was used in the same manner as in Example 1. [Example 1 2] An easy-adhesive polyester film for a battery was used in the same manner as in Example 1 except that the polyurethane resin was changed to polyaminomethyl A-1 0 ). [Example 1 3] (3) Production of back sheet for solar cell The solar cell of Example 1 was easily bonded to each other! A polyester film (50/zm) / aluminum foil (3 〇 Am) / polyvinyl fluoride m) was formed and dried by a dry lamination method to obtain a slab.膜 film / white poly film (3 8 ren m 昜 energy battery Chemicals, this made) = 9 / 1 acid ester resin (obtained solar acid resin (and obtained solar eye film / white film (38 μ for solar cells - 47- 201132499 Adhesive for dry lamination T AKELAC A-3 1 5 (manufactured by Mitsui Chemicals Co., Ltd.) / τ AKEN ATE A-10 (manufactured by Sanken Chemical Co., Ltd.) = 9/1 (solid content ratio) As in Example 1 And the backsheet for a solar cell of Example 1 is an EYE Super UV Tester SUV manufactured by Iwasaki Electric Co., Ltd., using an easy-adhesive polyester film surface for a solar cell as an irradiation surface. W151 &gt; 100 hours of continuous UV irradiation treatment at 6 3 ° C, 50% RH, and irradiation intensity of 100 mW/cm 2 "The solar cell backsheet results after UV irradiation were visually confirmed under a fluorescent lamp. In the solar cell backsheet of Example 10, although a slight yellowing was observed, the solar cell backsheet of Example 13 was completely colorless and maintained in a good appearance. -48- 201132499 ^ 1-1 1-^ 0.51 1.64 1 1 1.17 1.34 1.12 1.05 τ-Η 1.15 1.13 inch 1.18 1.17 1.20 1.38 1.20 EVA adhesion B. fast curing type IH heat and humidity resistance &X &lt; XXX 〇〇〇〇〇〇〇〇〇〇〇〇 性 ◎ ◎ ◎ &lt;&lt;3&lt; ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ Η Μ Μ 耐 耐 X X ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ A. Standard curing type 耐 Moisture and heat resistance ◎ X &lt; 3 X &lt; 0 ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ΗΗ 湿 湿 X X X ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ Example 1 Experimental Example 1 Experimental Example 2 Comparative Example 1 Comparative Example 2 Comparative Example 3 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Example 9 Example 10 Example 12 Example 13 | 6 inch, 201132499 [Examples 1 4] (1) Preparation of coating liquid The following coating agents were mixed to prepare a coating liquid. • Water 5 5 · 8 6 mass% • Isopropyl alcohol 30.00% by mass • Polyurethane resin solution (A-1 ) 13.52% by mass • Particles 0 · 5 9 mass % (average particle size 40 urn sol (solid content concentration: 40% by mass) • Surfactant 0.03% by mass (lanthanum, solid content concentration: 100% by mass) (2) Production of easy-adhesive white polyester film for solar cells (cavity material a) 60 The mass% of the polymethylpentene resin, the 20% by mass of the polypropylene resin, and the 20% by mass of the polystyrene resin are mixed in nine pieces, and then supplied to the vented twin-screw extruder which is adjusted to a temperature of 2 8 5 ° C. The press is kneaded to produce a void forming agent (raw material a). (Polyester b) Polymerization of polyethylene terephthalate resin containing cerium oxide particles by a conventional method to produce an intrinsic viscosity of 500 ppm of aggregated cerium oxide particles (average particle diameter of 2. 〇βιη) It is a polyethylene terephthalate of 62 dl/g (raw material b). -50- 201132499 (Masterbatch raw material c containing titanium oxide particles) The above polyethylene terephthalate (raw material b) and anatase titanium dioxide particles having an average particle diameter of 0.2 // m (堺Chemical Industries Co., Ltd.) Co., Ltd. (manufactured by Sakai Chemical Industry Co., Ltd.) was mixed at a mass ratio of 5 0/5 0 and kneaded by a venting kneading extruder to produce a mother particle raw material (raw material c) containing titanium oxide particles. (Production of Film) The above-mentioned raw materials subjected to vacuum drying under heating were continuously metered. The mixture was continuously stirred to have a/b/c = 8/82/10 (mass ratio) as a raw material of the layer A. Next, the raw material is supplied to an extruder for melt-kneading, and supplied to a feed splitter (co-extrusion adapter) through a filter. On the other hand, the raw material of the layer B is continuously metered to b/c == 80/20 (mass ratio), supplied to a vented twin-screw extruder for melt-kneading, and passed through a filter. And supplied to the feed splitter casing. In the feed splitter sleeve, the B layer is joined to the same thickness on both sides of the A layer. At this time, the amount of resin discharged to the A layer and the B layer is controlled so that the thickness ratio of each layer before the extension becomes B/A/B = 1 0 / 8 0 / 1 0 'and is cast at a surface temperature of 30 ° A cooling drum of C was used to produce an unstretched film having a thickness of 2.4 mm. At this time, air of 10 ° C was blown to the opposite side of the molten polymer extruded on the cooling drum to cool and solidify the molten polymer from both sides. -51 - 201132499 Next, the unstretched film obtained by the above method was heated to 65 °C using a heating roll, and then stretched 3.2 times between rolls having different peripheral speeds. At this time, in the intermediate portion between the low speed roller and the high speed roller, a concentrating infrared heater is disposed at a position facing the surface with the film interposed therebetween, so that the sufficient heat required for uniformly stretching the film is equally applied from both surfaces of the film. Next, the coating liquid was applied to one side of the PET film by a roll coating method, and then dried at 80 ° C for 20 seconds. Further, the coating amount was adjusted so that the coating amount after the final (after biaxial stretching) was 0.15 g/m2, and then introduced into a tenter, and the temperature was raised to 12 (TC to 150 °C) while heating. It was extended 3.9 times in the width direction, and heat treatment was applied by blowing a hot air of 22 ° C for 30 seconds in a tenter, and then slowly cooling to room temperature for 40 seconds while applying 2 to the width direction. The relaxation treatment of % was carried out to obtain an easily connectable white polyester film for a solar cell with a void having an apparent density of 1.10 g/cm3 and a thickness of 250/zm, and the evaluation results are shown in Table 2. Example 1 5] An easy-contact white color for solar cell was obtained in the same manner as in Example 14 except that the polyurethane resin was changed to the polyurethane resin (A-2). Polyester film. [Example 16] A solar cell was obtained in the same manner as in Example i4 except that the polyurethane resin was changed to the polyurethane resin (A-3). Easy-adhesive white polyester film. -52 - 201132499 [Example 1 7] The same procedure as in Example 14 was carried out except that the polyurethane resin was changed to the melamine group-containing polyurethane resin (A-4). An easy-adhesive white polyester film for a solar cell was obtained. [Example 1 8] Except that the polyurethane resin was changed to a polyurethane resin (A-9), the same as in Example 1 4, an easy-adhesive polyester film for solar cells was obtained in the same manner. [Example 1 9] Except that the polyurethane resin was changed to a polyurethane resin (A-100), the rest was An easy-adhesive polyester film for a solar cell was obtained in the same manner as in Example 14. -53- 201132499 (N撇色Η 〇; Γ-; Τ-^ 1&gt; c3 〇»〇〇〇〇〇〇. -1 95.6 95.8 (4) 95.8 95.4 褂Ο 1.17 1.34 CN Η 1.05 1.20 1.38 EVA adhesion B. Rapid curing type t-j Moisture resistance 〇〇〇〇〇〇 ◎ ◎ ◎ ◎ ◎ ◎ Moisture resistance ◎ ◎ ◎ ◎ ◎ ◎ Continuity ◎ ◎ ◎ ◎ ◎ ◎ A. Standard固 ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施 实施17 Example 18 Example 19 201132499 [Example 2 Ο] (1) Preparation of coating liquid The following coating agents were mixed to prepare a coating liquid. 5 5.6 2 mass% 3 0 . 〇〇 mass% 1 1.2 9 mass% 2.2 6 mass% 〇. 7 1 mass% • water • isopropyl alcohol • polyurethane resin solution (A-1) • End cap Polyisocyanate aqueous dispersion (B) • Particles (average particle size 40 nm sol, solid content concentration 40% by mass) • Particles 0.0 7 mass% (average particle size 450 nm bismuth sol, solid component concentration 40% by mass • Surfactant 0.05% by mass (lanthanum, solid content concentration: 1% by mass) (2) The production of easy-to-adherent polyester film for solar cells will be used as a raw material for film raw materials. The average particle diameter was 2.5; nine pieces of PET resin of zm cerium oxide particles (inherent viscosity: 0.62 dl/g) were dried at 135 ° C for 6 hours under reduced pressure of 133 Pa. Thereafter, the supply to the extruder was melted at about 2 8 5 t. The PET resin was filtered through a stainless steel sintered body filter (nominal filtration accuracy of 10 M m particles by 95%), and melt-extruded into a sheet. The spin-cooled metal roll was maintained at a surface temperature of 30 ° C to be quenched and cured to obtain an unstretched PET sheet. -55- 201132499 The unstretched P ET sheet is heated to 100 ° C with a heated roll group and infrared rays, and then extended by 3.5 times toward the length of the roll group having a peripheral speed difference to obtain a uniaxial direction. Extend the PET film. Next, the liquid was applied to one side of the PET film by a roll coating method, and then dried at 80 ° C for 20 seconds. Further, the coating amount was adjusted so that the final coating amount (after biaxial stretching) was 0.15 (the thickness of the coating layer after drying was 150 nm). Next, it was extended by 4.0 times in the width direction at a °C with a tenter, and heated at 230 ° C for 0.5 second under the length of the width of the fixed film, and 3% width at 100 ° C for 10 seconds. The direction of relaxation treatment to obtain 250 easy-to-adhere polyester film from solar cells. The evaluation results are shown in Table 3 (Experimental Example 3) except that the polyurethane resin was changed to the polyurethane tree A-5), and the battery was obtained in the same manner as in Example 20. Easy-adhesive polyester film. [Experimental Example 4] An easy-adhesive polyester film for a battery was obtained in the same manner as in Example 20 except that the polyurethane resin was changed to the polyurethane tree A-6. . [Comparative Example 4] An easy-adhesive polyester film for a battery was obtained in the same manner as in Example 20 except that the polyurethane resin was changed to the polyurethane tree A-7). . The heat is applied to the coating to form a g/m2:120 direction for a duration of m. Fat (Sun Cream (Sun-56-201132499 [Comparative Example 5] except that the polyurethane resin was changed to the polyurethane resin (A-8), and the other example 20 In the same manner, an easy-adhesive polyester film for a solar cell was obtained. [Comparative Example 6] The same as Example 20 except that the thickness of the substrate of the easy-adhesive polyester film for a solar cell was changed to 5 #m. In the same manner as in Example 20, the easy-adhesive polyester for solar cell was obtained in the same manner as in Example 20 except that the coating liquid was changed to the following. Film 5 8.0 2% by mass 3 0 · 0 〇 mass % 9.4 7 mass % 1 . 8 9 mass % 0 · 5 9 mass % water isopropanol polyurethane resin solution (A-1 ) end-capped type Polyisocyanate aqueous dispersion (B) particles (cerium sol having an average particle diameter of 40 nm, solid content concentration of 40% by mass) • 0.03 mass% of surfactant (lanthanum, solid content concentration: 1% by mass) [Examples] 22] In addition to changing the coating liquid to The remaining adhesive polyester film for solar cells was obtained in the same manner as in Example 20. -57- 201132499 5 4.7 5 mass% 3 0.00 Μ Λ % 1 2 · 9 9 mass % 1 . 5 2 Mass% 0.7 1% by mass 0.0 3 mass% Water isopropanol polyurethane solution (A-1) Blocked polyisocyanate aqueous dispersion (B) particles (average particle size 40 nm bismuth sol, solid Component concentration: 40% by mass) Surfactant (lanthanum, solid content concentration: 1% by mass) [Example 2 3] The same procedure as in Example 20 except that the coating liquid was changed to the following Obtained an easy-adhesive polyester film for solar cells. 5 7.3 5 mass% 3 0.00 Μ Μ % 8 . 1 2 mass% 3.7 9 mass% 0.7 1 mass% 0.0 3 mass. / hydrazine isopropanol polyamine A Acid ester resin solution (Α-1) Blocked polyisocyanate aqueous dispersion (Β) particles (矽 sol with an average particle diameter of 40 nm, solid concentration of 40% by mass) Surfactant (lanthanum, solid concentration 1 〇〇质量%) [Example 24] In addition to changing the coating liquid to the next In the same manner as in Example 20, the easy-adhesive polyester film for solar cell was obtained. -58- 201132499 Water isopropanol polyurethane resin solution (A-1) Polyisocyanate aqueous dispersion (B) particles (cerium sol having an average particle diameter of 40 nm, solid concentration of 40% by mass) Surfactant (lanthanum, solid concentration: 1% by mass) 5 9.9 5 mass% 3 0 · 0 0质量% 3.2 5 mass% 6.0 6 mass% 0.7 1 mass% 0.0 3 mass% Example 2 5 The solar cell was easily obtained in the same manner as in Example 20 except that the coating liquid was changed to the following. A polyester film. Water 6 0.8 2% by mass Isopropanol 3 0.0 0% by mass Polyurethane resin solution (A-1) 1.6 2% by mass Blocked polyisocyanate aqueous dispersion (B) 6.8 2% by mass Particles 0.7 1 mass % (矽 sol with an average particle diameter of 40 nm, solid content concentration of 40% by mass) Surfactant 0.03% by mass (lanthanum, solid content concentration: 1% by mass) -59- 201132499 [Example 26] In addition to polymerization The easy-adhesive polyester film for solar cells was obtained in the same manner as in Example 2 except that the urethane resin was changed to the polyurethane resin (A-2). [Example 2 7] The solar cell easy adhesion was obtained in the same manner as in Example 2 except that the polyurethane resin was changed to the polyurethane resin (A-3). Polyester film. [Example 2 8] Solar energy was obtained in the same manner as in Example 2 except that the polyurethane resin was changed to the urethane group-containing polyurethane resin (A - 4 ). Easy-to-adhere polyester film for batteries. [Example 29] A solar cell was obtained in the same manner as in Example 2 except that the blocked polyisocyanate aqueous dispersion (B) was changed to the oxazoline group-containing water-soluble resin (C). Easy-adhesive polyester film. [Example 30] The solar cell was easily obtained in the same manner as in Example 20 except that the blocked polyisocyanate aqueous dispersion (C) was changed to the carbodiimide water-soluble resin (D). Polyester film. [Example 3 1] Except that the blocked polyisocyanate aqueous dispersion (C) was changed to an imido-hydroxymethyl melamine (solid content concentration: 7 〇 mass%), the remaining -60-201132499 was compared with the examples. 2 易 The same way to obtain an easy-adhesive polyester film for solar cells. [Example 3 2] An easy-adhesive polyester film for a solar cell was obtained in the same manner as in Example 20 except that the thickness of the substrate of the easy-adhesive polyester film for a solar cell was changed to 50 / z m. [Example 3 3] An easy-contact polyester film for a solar cell was obtained in the same manner as in Example 20 except that the thickness of the substrate of the easy-adhesive polyester film for a solar cell was changed to 100 // m. . [Example 3 4] An easy-adhesive polyester film for a solar cell was obtained in the same manner as in Example 20 except that the thickness of the substrate of the easy-adhesive polyester film for a solar cell was changed to 350 μm. [Example 3 5] An easy-adhesive polyester film for a solar cell was obtained in the same manner as in Example 20 except that the coating liquid was changed to the following. • Water 6 2.8 2% by mass 3 0 · 0 0 Quality. /〇5.6 7 mass% 1.1.3 mass% 0.3 5 mass% isopropyl alcohol polyurethane resin solution (A-1) blocked polyisocyanate aqueous dispersion (B) particles (average particle size 40 nm矽Sol, solid concentration 40% by mass) -61 - 201132499 • Surfactant 0. 〇3 mass% (lanthanum, solid content concentration 100% by mass) [Example 3 6] In addition to changing the coating liquid to the next In the same manner as in Example 20, the easy-adhesive polyester film for solar cells was obtained. • Water 45.99% by mass • Isopropyl alcohol 30.00% by mass • Polyurethane resin solution (A-1) 18.99% by mass • Blocked polyisocyanate aqueous dispersion (B) 3.80% by mass • Particle 1 · 1 9 % by mass (矽 sol with an average particle diameter of 40 nm, solid content concentration of 40% by mass) • 0.03 mass% of surfactant (lanthanum, solid content concentration: 1% by mass) [Example 3 7] (3) Solar cell The back sheet was fabricated by the easy-adhesive polyester film/black polyester film (50 gm) / aluminum foil (30 #m) / polyvinyl fluoride film (38 / zm) for the solar cell of Example 20, and was dry. The laminate method is followed by obtaining a back sheet for a solar cell. Dry laminating adhesive TAKELAC A-3 1 5 (manufactured by Mitsui Chemicals Co., Ltd.) / ΤΑΚΕΝΑΤΕ Α-10 (manufactured by Sangen Chemical Co., Ltd.) = 9/1 (solid content ratio) [Example 3 8] -62- 201132499 The easy-adhesive polyester film for solar cells was obtained in the same manner as in Example 20 except that the polyurethane resin was changed to the polyurethane resin (A_9). [Example 3 9] In addition to changing the polyurethane resin to the polyurethane resin (A - 1 0 ), the solar cell was easily obtained in the same manner as in Example 20 Polyester film. [Example 40] (3) Production of back sheet for solar cell The easy-adhesive polyester film/black polyester film (50 μm) / aluminum foil (30#m) / polyvinyl fluoride film for solar cell of Example 38 The structure of (38//m) was followed by a dry buildup method to obtain a back sheet for a solar cell. Dry laminating adhesive TAKELAC A-3 1 5 (manufactured by Mitsui Chemicals Co., Ltd.) / ΤΑΚΕΝΑΤΕ A-1 0 (manufactured by Sangen Chemical Co., Ltd.) = 9 Π (solid content ratio) Solar cells of Examples 37 and 40 The back surface is used as the irradiation surface of the easy-adhesive polyester film surface for solar cells, and the Eye Super UV Tester SUV-W151 manufactured by Iwasaki Electric Co., Ltd. is used at 63 ° C, 50% RH, and the irradiation intensity is 100. A continuous UV irradiation treatment of 100 hours was performed under mW/cm2. The solar cell backsheet after UV irradiation was visually confirmed under a fluorescent lamp. Although the solar cell backsheet of Example 37 was observed to have a little yellowing, the solar cell backsheet of Example 40 was comprehensive. There is no change in color and it maintains a good appearance. -63- 201132499 «-〇鹋§ 0.93 0.37 § 0.93 1.05 0.84 0.63 0.51 1.18 0.90 1.00 0.94 0.91 0.88 0.94 0.92 0.92 0.92 0.93 0.93 0.98 1.21 0.98 付 m is B. Fast curing type |-M Moisture and heat resistance ◎ X &lt; ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ HH湿 ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ W | A. Standard curing type moist heat resistance ◎ X &lt;] X ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ 〇 〇 ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ 1 ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ Example 20 | Experimental Example 3 | Experimental Example 4 Comparative Example 4 Comparative Example 5 I Comparative Example 实施 Example 21 Example 22 Example 23 Example 24 Example 25 Example 26 Example 27 Example 28 Example 29 Example 30 Example 31 Example 32 Example 33 Example 34 Example 35 Example 16 Example 37 Example 38 Example 39 I Example 40 - inch 9 丨 201132499 [Example 4 1] (1) Preparation of coating liquid The following coating agents were mixed to prepare a coating liquid. 5 5.6 2% by mass 3 0.0 0% by mass 1 1. 2 9 mass% 2.2 6 mass% 0.7 1 mass% • Water • Isopropanol • Polyurethane resin solution (A-1) • End-capped poly Isocyanate aqueous dispersion (B) • Particles (average particle size 40 nm sol, solid concentration 40% by mass) • Particle 0 · 0 7 mass% (average particle size 450 nm bismuth sol, solid concentration 40% by mass • Surfactant 0.05% by mass (lanthanum, solid content concentration: 1% by mass) (2) Production of easy-adhesive white polyester film for solar cells (cavity material a) 60% by mass of polymethyl group The pentene resin, 20% by mass of the polypropylene resin, and 20% by mass of the polystyrene resin are mixed in nine pieces, and then supplied to a vented twin-screw extruder adjusted to 285 ° C and kneaded. A void forming agent (raw material a) is produced. (Polyester b) A polyethylene terephthalate resin containing cerium oxide particles is polymerized by a conventional method to produce agglomerated cerium oxide-65-201132499 particles containing 500 ppm (average particle diameter of 2.0) Ym) and polyethylene terephthalate (raw material b) having an intrinsic viscosity of 0.62 dl/g. (Masterbatch raw material c containing titanium oxide particles) The above-mentioned polyethylene terephthalate (raw material b) and anatase type titanium dioxide particles having an average particle diameter of 〇. 2 /zm (manufactured by Suga Chemical Industry Co., Ltd.) Mixing at a mass ratio of 50/50 and kneading in a vent type kneading extruder to produce a mother particle raw material (raw material c) containing titanium oxide particles (manufacture of a film), which is subjected to vacuum drying under heating The raw material is continuously metered and continuously stirred to a/b/c = 8/82/10 (mass ratio) to be used as a raw material for the layer A. Next, the raw material is supplied to an extruder for melt-kneading, and is supplied to a feed splitter sleeve (co-extruded joint) via a filter. On the other hand, the raw material of the layer B is continuously metered using the aforementioned raw materials. To be b/c = 80/20 (mass ratio), it is supplied to a vented twin-screw extruder for melt-kneading, and is supplied to a feed splitter bush through a filter. In the feed splitter sleeve, the B layer is joined to the same thickness on both sides of the A layer. At this time, the amount of resin discharged to the A layer and the B layer is controlled so that the thickness ratio of each layer before the extension becomes B/A/B = 10/80/10, and the cooling is performed at a surface temperature of 30 ° C. An unstretched film having a thickness of 2.4 mm was fabricated on the barrel. At this time, air of 1 ° C was blown to the opposite side of the molten polymer extruded on the cooling drum to cool and solidify the molten polymer from both sides. -66-201132499 Next, the unstretched film obtained by the above method was heated to 65 ° C using a heating roll, and then stretched 3.2 times between rolls having different peripheral speeds. At this time, in the intermediate portion between the low speed roller and the high speed roller, a concentrating infrared heater is disposed at a position facing the surface with the film interposed therebetween, so that the sufficient heat required for uniformly stretching the film is equally applied from both surfaces of the film. Next, the coating liquid was applied to one side of the PET film by a roll coating method, and then dried at 80 ° C for 20 seconds. Further, the coating amount was adjusted so that the coating amount after the final (after biaxial stretching) drying was 0.15 g/m2 (the thickness of the coating layer after drying was 150 nm). Subsequently, it was introduced into a tenter, and was heated to a temperature of 12 CTC to 150 °C while extending 3.9 times in the width direction. Further, heat treatment was applied by blowing a hot air of 22 °C for 30 seconds in a tenter. Thereafter, while slowly cooling to room temperature for 40 seconds, a relaxation treatment of 2% was applied in the width direction to obtain a biaxial alignment containing voids having an apparent density of 1.10 g/cm 3 and a thickness of 250/zm. An easy-to-adhesive white polyester film for solar cells. The evaluation results are shown in Table 4. [Example 42] The easy-adhesive white polymerization for solar cells was obtained in the same manner as in Example 41 except that the polyurethane resin was changed to the polyurethane resin (A-2). Ester film. [Example 43] An easy-contact white color for solar cell was obtained in the same manner as in Example 41 except that the polyurethane resin was changed to the polyurethane resin (A-3). Polyester film. -67-201132499 [Example 44] The same procedure as in Example 41 was carried out except that the polyurethane resin was changed to the melamine group-containing polyurethane resin (A-4). An easy-adhesive white polyester film for solar cells was obtained. [Example 45] An easy-contact polyester for solar cell was obtained in the same manner as in Example 41 except that the polyurethane resin was changed to the polyurethane resin (A - 9 ). Films [Example 46] In the same manner as in Example 41 except that the polyurethane resin was changed to the polyurethane resin (A-1 0 ), the solar cell was easily used. Polyester film ° -68- 201132499 inch tone Γ-; »—Η 1-H TH C^; a ο in 〇ο in o IT) oo 1 95.8 1 | 95.3 | 1 95.6 1 95.8 | 95.8 | 95.8 Absorbance Ratio 1460/1530 0.93 1.15 1.05 0.84 0.98 1.21 EVA adhesion B. Rapid curing type h-j Moisture resistance ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ KH Moisture resistance ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ A. Standard curing type jH Moisture resistance ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ Example 41 Implementation Example 42 Example 43 Implementation [Example 45] Example 46 _ 69 丨 201132499 [Industrial Applicability] The easy-adhesive polyester film for solar cell of the present invention has adhesion to a sealing material and adhesion under high temperature and high humidity ( It is excellent in heat and humidity resistance, so it is suitable as the most suitable base film for solar cell backsheets. [Simplified illustration] None. [Main component symbol description] ίΚ. -70-

Claims (1)

201132499 VII. Patent application scope: 1. An easy-contact polyester film for solar cells, which is a polyester film having a coating layer having a coating thickness of 20 to 500/zm at least on one side, and the coating layer contains A urethane resin containing an aliphatic polycarbonate polyol as a constituent component. 2. The easy-adhesive polyester film for a solar cell according to the first aspect of the invention, wherein the coating layer is a urethane resin containing an aliphatic polycarbonate polyol as a constituent component, and In the infrared spectroscopy spectrum of the coating layer, the absorbance (A146G) in the vicinity of 1460 CHT1 derived from the aliphatic polycarbonate component and the absorbance in the vicinity of 1 5 3 0 cnT1 derived from the urethane component (A! 53) The ratio of 〇) (Ai46〇/Ai530) is 〇.7〇 to 1.60. 3. The easy-adhesive polyester film for solar cell according to claim 1, wherein the coating layer is mainly composed of an aliphatic polycarbonate polyol as a constituent urethane resin and a crosslinking agent. In the infrared spectroscopy spectrum of the coating layer, the absorbance (A146〇) in the vicinity of 1460 CHT1 derived from the aliphatic polycarbonate component and the absorbance in the vicinity of 1530 CHT1 derived from the urethane component (Α153ϋ) The ratio (Αΐ46〇/Αΐ530) is 0.50 to 1.55. 4. The easy-adhesive polyester film for solar cells according to claim 3, wherein the crosslinking agent is selected from the group consisting of a melamine crosslinking agent, an isocyanate crosslinking agent, a carbodiimide crosslinking agent, and a hydrazine. At least one crosslinking agent in the oxazoline crosslinking agent. -71 - 201132499 5. The solar cell film of claim 3, wherein the crosslinked acid ester resin in the coating layer is 5 mass. /. The above and 90 quality 6. The acylate film of the first to fifth aspects of the patent application, wherein the polyester film is white 7. The back sheet for a solar cell, which is tied to the solar cell for easy adhesion. The content of the easy-adhesive polyester thinner for a battery is less than or equal to the amount of the amino group. : Easy-adhesive polyester film for solar cells. The layer is made of the first polyester film of the patent application range. -72- 201132499 IV. Designated representative map: (1) The representative representative of the case is: None. (2) A brief description of the symbol of the representative figure: None 0. If there is a chemical formula in this case, please disclose the chemical formula that best shows the characteristics of the invention: