WO2011068132A1 - Film de polyester à collage facile pour cellules solaires - Google Patents

Film de polyester à collage facile pour cellules solaires Download PDF

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Publication number
WO2011068132A1
WO2011068132A1 PCT/JP2010/071513 JP2010071513W WO2011068132A1 WO 2011068132 A1 WO2011068132 A1 WO 2011068132A1 JP 2010071513 W JP2010071513 W JP 2010071513W WO 2011068132 A1 WO2011068132 A1 WO 2011068132A1
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WO
WIPO (PCT)
Prior art keywords
mass
polyester film
film
coating layer
solar cells
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PCT/JP2010/071513
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English (en)
Japanese (ja)
Inventor
晃侍 伊藤
寛子 矢吹
森　憲一
Original Assignee
東洋紡績株式会社
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Application filed by 東洋紡績株式会社 filed Critical 東洋紡績株式会社
Priority to CN201080054340.2A priority Critical patent/CN102639615B/zh
Priority to KR1020127015519A priority patent/KR101421360B1/ko
Publication of WO2011068132A1 publication Critical patent/WO2011068132A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/043—Improving the adhesiveness of the coatings per se, e.g. forming primers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
    • C08G18/44—Polycarbonates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/0427—Coating with only one layer of a composition containing a polymer binder
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/048—Forming gas barrier coatings
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
    • C09D175/04—Polyurethanes
    • C09D175/06—Polyurethanes from polyesters
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/22—Plastics; Metallised plastics
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/22—Plastics; Metallised plastics
    • C09J7/25—Plastics; Metallised plastics based on macromolecular compounds obtained otherwise than by reactions involving only carbon-to-carbon unsaturated bonds
    • C09J7/255—Polyesters
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/29—Laminated material
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/35—Heat-activated
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/042—PV modules or arrays of single PV cells
    • H01L31/048—Encapsulation of modules
    • H01L31/049—Protective back sheets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S10/00—PV power plants; Combinations of PV energy systems with other systems for the generation of electric power
    • H02S10/30—Thermophotovoltaic systems
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2475/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
    • C08J2475/04—Polyurethanes
    • C08J2475/08—Polyurethanes from polyethers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
    • C09J2203/322—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of solar panels
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2467/00—Presence of polyester
    • C09J2467/006—Presence of polyester in the substrate
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2475/00—Presence of polyurethane
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy

Definitions

  • the present invention relates to an easily adhesive polyester film for solar cells. Specifically, it is a polyester film excellent in adhesion with a sealant even under high temperature and high humidity.
  • a solar cell is a photovoltaic power generation system that directly converts sunlight energy into electricity.
  • solar cell elements semiconductors such as single crystal silicon, polycrystalline silicon, and amorphous silicon, compound-based, or organic dyes are used.
  • semiconductors such as single crystal silicon, polycrystalline silicon, and amorphous silicon, compound-based, or organic dyes are used.
  • several to several tens of solar cell elements are wired in series and in parallel, and various types of packaging are performed to protect the elements over a long period of time (about 20 years or more).
  • a unit incorporated in this package is called a solar cell module.
  • the solar cell module is generally composed of a plurality of layers such as a surface that is exposed to sunlight with glass, the solar cell element is filled with a sealing material, and the back surface is called a back sheet, such as a heat-resistant, weather-resistant plastic material.
  • a sealing material filling the solar cell element an olefin resin such as ethylene / vinyl acetate copolymer resin (hereinafter EVA) or polyvinyl butyral resin (hereinafter PVB) is used.
  • EVA ethylene / vinyl acetate copolymer resin
  • PVB polyvinyl butyral resin
  • a module is produced by stacking the above glass substrate / sealing material / solar cell element / sealing material / back sheet and heat-pressing with a vacuum laminator or the like.
  • the sealing material has a role of adhering and fixing the solar cell element, preventing moisture from entering from the outside, and protecting the solar cell element.
  • a laminated structure such as a film (antifouling layer) has been proposed.
  • the backsheet serves to protect the solar cell element from external moisture and contamination over a long period of time. Therefore, the adhesiveness between the sealing material and the polyester film on the solar cell element side that is in direct contact with the sealing material is important.
  • a polyester film that has not been subjected to a surface treatment cannot obtain sufficient adhesiveness and is required to be improved.
  • Patent Documents 1 to 4 it has been proposed to provide an adhesive layer containing a resin or a crosslinking agent.
  • compositions including additives such as a crosslinking agent and an ultraviolet absorber have come to be used for the sealing material from the viewpoint of improving productivity and preventing deterioration. Therefore, there is a demand for a highly versatile and easy-to-adhere film that exhibits the same degree of adhesion to various sealing materials.
  • the present invention has strong adhesiveness that can withstand harsh environments, hardly causes deterioration of adhesiveness under high temperature and high humidity, which has been conventionally considered to be unavoidable, and has various sealing properties. It is an object of the present invention to provide an easily adhesive polyester film for solar cells that has good adhesion to a stopper.
  • the polyester film has a coating layer on at least one surface, and the coating layer includes a urethane resin having an aliphatic polycarbonate polyol as a constituent component,
  • the main component is a urethane resin having an aromatic polycarbonate polyol as a constituent component
  • the absorbance (A 1460 ) around 1460 cm ⁇ 1 derived from the aliphatic polycarbonate component and the vicinity of 1530 cm ⁇ 1 derived from the urethane component in the infrared spectrum In the case where the main component is a urethane resin having an aromatic polycarbonate polyol as a constituent component, the absorbance (A 1460 ) around 1460 cm ⁇ 1 derived from the aliphatic polycarbonate component and the vicinity of 1530 cm ⁇ 1 derived from the urethane component in the infrared spectrum.
  • the coating layer having a ratio (A 1460 / A 1530 ) to the absorbance (A 1530 ) of 0.70 to 1.60, strong adhesiveness that can withstand even harsh environments can be achieved.
  • the present inventors have found that excellent adhesiveness can be obtained even under humidity, and have reached the present invention.
  • the coating layer is mainly composed of a urethane resin having an aliphatic polycarbonate polyol as a constituent component and a cross-linking agent as main components, the absorbance in the vicinity of 1460 cm ⁇ 1 derived from the aliphatic polycarbonate component (A 1460 ) in the infrared spectrum.
  • An easily adhesive polyester for solar cells which is a polyester film having a substrate thickness of 20 to 500 ⁇ m having an application layer on at least one surface, and the application layer contains a urethane resin containing an aliphatic polycarbonate polyol as a constituent component the film.
  • the coating layer is mainly composed of a urethane resin having an aliphatic polycarbonate polyol as a constituent component, and the absorbance in the vicinity of 1460 cm ⁇ 1 derived from the aliphatic polycarbonate component (A 1460) in the infrared spectrum of the coating layer.
  • the coating layer is mainly composed of a urethane resin having an aliphatic polycarbonate polyol as a constituent component and a cross-linking agent, and the absorbance around 1460 cm ⁇ 1 derived from the aliphatic polycarbonate component in the infrared spectrum of the coating layer.
  • (a 1460) and 1530 cm -1 near the absorbance derived from urethane component ratio of (a 1530) (a 1460 / a 1530) is 0.50 to 1.55 the sun highly adhesive polyester film for batteries.
  • the solar cell easily adhesive polyester film wherein the crosslinking agent is at least one crosslinking agent selected from a melamine crosslinking agent, an isocyanate crosslinking agent, a carbodiimide crosslinking agent, and an oxazoline crosslinking agent.
  • the said easily adhesive polyester film for solar cells whose content of the said crosslinking agent in the said application layer is 5 to 90 mass% with respect to urethane resin.
  • the said polyester film is a white polyester film, The said easily adhesive polyester film for solar cells.
  • a solar cell backsheet in which the solar cell easy-adhesive polyester film is laminated.
  • the easily-adhesive polyester film for solar cells of the present invention exhibits strong adhesion, and is particularly excellent in adhesion (humidity heat resistance) under high temperature and high humidity. Therefore, as a preferred embodiment, the adhesiveness at the high temperature and high humidity treatment is maintained at the same level as the initial adhesiveness. Moreover, as a preferable embodiment of the present invention, when the easily adhesive polyester film for solar cell of the present invention is used as a member of a back sheet, the adhesiveness with a sealing material is good.
  • the polyester resin constituting the substrate in the present invention includes polyethylene terephthalate, polybutylene terephthalate, polyethylene-2,6-naphthalate, polymethylene terephthalate, and copolymerization components such as diethylene glycol, neopentyl glycol, polyalkylene glycol, etc. Polyester resins obtained by copolymerizing diol components, dicarboxylic acid components such as adipic acid, sebacic acid, phthalic acid, isophthalic acid, and 2,6-naphthalenedicarboxylic acid can be used.
  • the polyester resin suitably used in the present invention mainly contains at least one of polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate as a constituent component.
  • polyethylene terephthalate is most preferable from the balance between physical properties and cost.
  • these polyester films can improve chemical resistance, heat resistance, mechanical strength, etc. by biaxially stretching.
  • the polyester film of the present invention may be a single-layer polyester film or a polyester film composed of at least three layers having an outermost layer and a center layer.
  • particles are contained in the outermost layer (A layer in the case of the above-mentioned two types and three layers), and particles are substantially contained in the central layer (B layer in the case of the above two types and three layers). May not be included.
  • a layer in the case of the above-mentioned two types and three layers
  • B layer in the case of the above two types and three layers
  • particles in the A layer is that when the polyester film of the present invention is used as a member for a solar cell, a metal or a moisture-proof functional layer such as a metal oxide thin film layer or a coating layer, This is for improving the handling property in the post-processing step such as laminating a fouling functional layer.
  • sufficient handling properties suitable for processability can be obtained.
  • the B layer substantially does not contain particles is to reduce the probability of formation of protrusions due to aggregates of lubricant particles, particularly inorganic particles. Further, by adopting such a configuration, a highly transparent film can be obtained, which is suitable for a field requiring transparency, such as a see-through solar cell.
  • substantially free of inert particles means, for example, in the case of inorganic particles, when the element derived from the particles is quantitatively analyzed by fluorescent X-ray analysis, it is less than 50 ppm, preferably less than 10 ppm. Preferably, the content is below the detection limit. This is because even if particles are not added positively, contaminants derived from foreign substances and raw material resin or dirt attached to the line or equipment in the film manufacturing process may be peeled off and mixed into the film. It is.
  • These layers can contain various additives in the polyester, if necessary.
  • the additive include an antioxidant, a light resistance agent, an antigelling agent, an organic wetting agent, an antistatic agent, an ultraviolet absorber, and a surfactant.
  • the type and content of the particles contained in the outermost layer may be inorganic particles or organic particles, and are not particularly limited.
  • examples thereof include inorganic particles that are inert to metal oxides such as silica, titanium dioxide, talc, and kaolinite, and polyesters such as calcium carbonate, calcium phosphate, and barium sulfate. Any one of these inert inorganic particles may be used alone, or two or more thereof may be used in combination.
  • the above particles preferably have an average particle size of 0.1 to 3.5 ⁇ m.
  • the lower limit of the average particle diameter is more preferably 0.5 ⁇ m, further preferably 0.8 ⁇ m, and still more preferably 1.0 ⁇ m.
  • the upper limit of the average particle is more preferably 3.0 ⁇ m, still more preferably 2.8 ⁇ m. If the average particle size is less than 0.1 ⁇ m, sufficient handling properties cannot be obtained. When it exceeds 3.5 ⁇ m, coarse protrusions are likely to be generated.
  • These particles are preferably porous particles, particularly porous silica.
  • the porous particles are preferable because they are easily deformed into a flat shape when stretched in the film forming process and the decrease in transparency is small.
  • the content of the inorganic particles in the outermost layer is preferably 0.01 to 0.20% by mass with respect to the polyester constituting the outermost layer.
  • the lower limit of the concentration is more preferably 0.02% by mass, and further preferably 0.03% by mass.
  • the upper limit of the concentration is more preferably 0.15% by mass, and further preferably 0.10% by mass. If it is less than 0.01% by mass, sufficient handling properties cannot be obtained. If it exceeds 0.2% by mass, the transparency is lowered, which is not preferable.
  • the average particle diameter of the particles can be measured by the following method. Take a photograph of the particles with an electron microscope or an optical microscope and at a magnification such that the size of one smallest particle is 2 to 5 mm, the maximum diameter of 300 to 500 particles (in the case of porous silica, Particle diameter) is measured, and the average value is taken as the average particle diameter. Moreover, when calculating
  • TEM transmission electron microscope
  • a known method can be adopted.
  • it can be added at any stage for producing the polyester, but it is preferably added as a slurry dispersed in ethylene glycol or the like at the stage of esterification or after the end of the ester exchange reaction and before the start of the polycondensation reaction.
  • the polycondensation reaction may proceed.
  • a method of blending a slurry of particles dispersed in ethylene glycol or water with a vented kneading extruder and a polyester raw material or a method of blending dried particles and a polyester raw material using a kneading extruder It can be carried out.
  • the film of the present invention preferably uses a white polyester film as a polyester film so that reflected light can be used from the viewpoint of improving the photoelectric conversion efficiency of the solar cell.
  • the white polyester film should have an L value of 85.0 to 100, an a value of -10.0 to +10.0, and a b value of -10.0 to +10.0. Is preferred. If it is this range, the reflectance of light becomes high and is preferable.
  • the base material contains a white pigment and / or inorganic particles from the viewpoint of imparting whiteness or hiding property to the polyester film of the base material and improving light reflectivity.
  • titanium oxide, barium sulfate, zinc oxide, zinc sulfide, calcium carbonate and the like can be used as the white pigment used for the white polyester film.
  • the white pigment can be subjected to various organic and inorganic surface treatments for the purpose of improving dispersibility.
  • titanium oxide is preferable among white pigments because it has a high refractive index and can exhibit high whiteness in a small amount.
  • a fluorescent brightening agent in combination because the whiteness can be further improved.
  • the lower limit of the content of the white pigment in the white polyester film is preferably 5% by mass, particularly preferably 8% by mass, from the viewpoint of light reflectivity.
  • the upper limit of the white pigment content is preferably 30% by mass, more preferably 25% by mass, and particularly preferably 20% by mass from the viewpoint of film formation stability.
  • inorganic particles, heat-resistant organic particles, antioxidants, crosslinking agents, ultraviolet absorbers, plasticizers having an average particle size smaller than that of the white pigment in the base material Etc. can be contained as needed.
  • the white polyester film contains a white pigment and at least one inorganic particle having an average particle size larger than that of the white pigment.
  • white pigments such as titanium oxide, barium sulfate, zinc oxide, zinc sulfide, and calcium carbonate may be used, or inorganic particles having a small difference in refractive index from polyester such as silica may be used.
  • the white pigments may be the same type or different types.
  • silica is preferable from the viewpoints of cost and handleability.
  • the upper limit value of the average particle diameter of the inorganic particles contained in the white polyester film is important to be 5.0 ⁇ m from the viewpoint of appearance in post-processing, preferably 3.0 ⁇ m, particularly preferably 2.0 ⁇ m. It is. Further, the lower limit of the average particle diameter of the inorganic particles contained in the base film is preferably 0.5 ⁇ m, particularly preferably from the viewpoint of slipperiness in the film production process and the post-processing process. 7 ⁇ m.
  • the white polyester film may be a single layer or a multilayer.
  • the layer containing the white pigment and / or inorganic particles is an A layer and the other layers are a B layer and a C layer
  • a / B / A, A / B / C, C / A / B / Layer configurations such as A, C / A / B / A / C, C / A / B, etc. can be selected.
  • the B / A / B layer has a two-type / three-layer structure
  • the B layer may not contain particles, and in order to further improve the light reflectivity, a white pigment is used in the same manner as the A layer.
  • inorganic particles, heat-resistant organic particles, or the like may be included.
  • a fluorescent whitening agent may be contained in the B layer as long as the effects of the present invention are not impaired.
  • the white polyester film is preferably a cavity-containing film in which a polyester resin and a thermoplastic resin incompatible with the polyester resin are contained as a cavity-forming agent and then a cavity is formed by stretching in at least one direction.
  • the thickness of the polyester film serving as the substrate of the present invention is 20 to 500 ⁇ m, more preferably 25 to 450 ⁇ m, and still more preferably 30 to 300 ⁇ m.
  • the substrate thickness is thin, the influence of heat shrinkage is large, and the adhesiveness after high temperature and high humidity treatment may be reduced. If it is thick, it cannot be wound as a roll.
  • the easily adhesive polyester film for solar cells of the present invention is characterized by containing a urethane resin containing an aliphatic polycarbonate polyol as a constituent component.
  • a urethane resin containing an aliphatic polycarbonate polyol as a main component is used as a coating layer as a coating layer, an absorbance around 1460 cm ⁇ 1 derived from an aliphatic polycarbonate component (A 1460 ) as measured by infrared spectroscopy. It is important that the ratio (A 1460 / A 1530 ) of the absorbance (A 1530 ) near 1530 cm ⁇ 1 derived from the urethane component is 0.70 to 1.60.
  • the coating layer is mainly composed of a urethane resin having an aliphatic polycarbonate polyol as a constituent component and a cross-linking agent as main components
  • the absorbance in the vicinity of 1460 cm ⁇ 1 derived from the aliphatic polycarbonate component (A 1460 ) in the infrared spectrum is 0.50 to 1.55.
  • the “main component” means that it is contained in an amount of 50% by mass or more, more preferably 70% by mass or more as the total solid component contained in the coating layer.
  • the conventional technical common sense positively introduces a cross-linking structure in forming the coating layer to make the coating layer rigid and strong, in order to improve the durability of the coating layer.
  • the polyurethane resin comprising an aliphatic polycarbonate polyol as a constituent component controls the absorbance by infrared spectroscopy within a certain range, thereby exhibiting strong adhesion and adhesion under high temperature and high humidity heat.
  • the inventors have found a remarkable effect of improving the quality of the present invention and have reached the present invention.
  • the mechanism of improving adhesiveness with such a configuration is not well understood, the present inventor thinks as follows.
  • thermocompression bonding is performed at a high temperature in a configuration in which a polyester film (coating layer) having a glass substrate / sealing material / coating layer is laminated.
  • stress arises between a polyester film (coating layer) and a sealing material by the thermal contraction of the polyester film at the time of high temperature adhesion.
  • the generation of such stress can also vary depending on various kinds of sealing materials and bonding conditions. As a result, it was considered that the stress could not be alleviated and the adhesiveness with the sealing material was lowered.
  • degradation of the coating layer proceeds due to hydrolysis.
  • a coating layer mainly composed of a urethane resin having an aliphatic polycarbonate polyol as a constituent component, and an absorbance around 1460 cm ⁇ 1 derived from an aliphatic polycarbonate component measured by infrared spectroscopy (A 1460 ) and the absorbance (A 1530 ) in the vicinity of 1530 cm ⁇ 1 derived from the urethane component (A 1460 / A 1530 ) are 0.70 to 1.60, so that the above characteristics can be achieved. That is, the above-mentioned characteristics can be achieved by coexisting an aliphatic polycarbonate component having hydrolysis resistance and a urethane component exhibiting toughness at a predetermined ratio.
  • the absorbance (A 1460 ) in the vicinity of 1460 cm ⁇ 1 is derived from the bending vibration specific to the C—H bond in the methylene group contained in the aliphatic polycarbonate component. Therefore, the absorbance (A 1460 ) in the vicinity of 1460 cm ⁇ 1 depends on the amount of the aliphatic polycarbonate polyol component constituting the urethane resin present in the coating layer. On the other hand, the absorbance around 1530 cm ⁇ 1 (A 1530 ) originates from the variable vibration that is characteristic of the N—H bond contained in the urethane component.
  • the magnitude of absorbance (A 1530 ) near 1530 cm ⁇ 1 depends on the amount of the urethane component constituting the urethane resin present in the coating layer. Therefore, these absorbance ratios (A 1460 / A 1530 ) indicate that both components having different characteristics coexist in a specific ratio.
  • the ratio (A 1460 / A 1530 ) is 0.70 to 1.60, but the lower limit of the ratio (A 1460 / A 1530 ) is preferably 0.75, more preferably 0.00. 80.
  • the upper limit of the ratio (A 1460 / A 1530 ) is preferably 1.50, more preferably 1.45, and even more preferably 1.40.
  • the ratio (A 1460 / A 1530 ) is less than 0.70, the amount of the hard urethane component is excessive, and the stress relaxation of the coating layer is lowered, so that the heat and moisture resistance is lowered.
  • the ratio (A 1460 / A 1530 ) exceeds 1.55, the aliphatic component of the flexible aliphatic polycarbonate is excessively increased, and the strength of the coating layer is lowered, so that the coating strength and moisture and heat resistance are reduced. Decreases.
  • the present invention can exhibit strong adhesiveness with the sealing material and can improve the adhesiveness (humidity heat resistance) under high temperature and high humidity. Further, the configuration of the present invention will be described in detail below.
  • the coating layer is mainly composed of a urethane resin having an aliphatic polycarbonate polyol as a constituent component and a cross-linking agent
  • the ratio (A 1460 / A 1530 ) of the light absorbency (A 1530 ) in the vicinity of 1530 cm ⁇ 1 derived from the urethane component is 0.50 to 1.55, in addition to satisfying the above characteristics, various sealing It has versatility that can be widely applied to materials.
  • composition types including additives such as a crosslinking agent and an ultraviolet absorber have come to be used for the sealing material from the viewpoint of improving productivity and preventing deterioration.
  • heat treatment for example, 30 to 50 minutes at 140 to 160 ° C.
  • thermocompression bonding for example, 90 to 130 ° C. for 5 to 10 minutes
  • sealing is performed slowly.
  • Adhesive conditions for curing the stop material are employed.
  • an adhesive condition is employed in which heat-pressure bonding (for example, 15 to 20 minutes at 140 to 160 ° C.) is performed in a short time and the sealing material is rapidly cured.
  • it is a coating layer mainly composed of a urethane resin having a aliphatic polycarbonate polyol as a constituent component and a cross-linking agent, and has a wavelength of about 1460 cm ⁇ 1 derived from the aliphatic polycarbonate component measured by infrared spectroscopy.
  • a urethane resin having a aliphatic polycarbonate polyol as a constituent component and a cross-linking agent
  • the ratio of the absorbance (A 1460 ) to the absorbance (A 1530 ) in the vicinity of 1530 cm ⁇ 1 derived from the urethane component (A 1460 / A 1530 ) is 0.50 to 1.55, the above characteristics are compatible. .
  • the ratio (A 1460 / A 1530 ) is 0.50 to 1.55, and the lower limit of the ratio (A 1460 / A 1530 ) is preferably 0.60, and more preferably 0.70.
  • the upper limit of the ratio (A 1460 / A 1530 ) is preferably 1.45, more preferably 1.35, and even more preferably 1.25. This makes it possible to relieve stress due to thermal shrinkage of the film during thermal bonding at high temperatures, so that strong adhesiveness can be obtained even under various sealing materials and bonding conditions. It is believed that the coating layer can be prevented from deteriorating because it retains heat resistance and hydrolysis resistance even in a humid environment. The reason why the preferable ratio range shifts to the crosslinking agent is considered to be due to an increase in crosslinking points by the crosslinking agent.
  • the urethane resin of the present invention includes at least a polyol component and a polyisocyanate component as constituent components, and further includes a chain extender as necessary.
  • the urethane resin of the present invention is a polymer compound in which these constituent components are mainly copolymerized by urethane bonds. In this invention, it has an aliphatic polycarbonate polyol as a structural component of a urethane resin. Heat-moisture resistance can be improved by including a urethane resin containing an aliphatic polycarbonate polyol as a constituent component in the coating layer of the present invention.
  • the components of these urethane resins can be specified by nuclear magnetic resonance analysis or the like.
  • the diol component which is a constituent component of the urethane resin of the present invention, needs to contain an aliphatic polycarbonate polyol having excellent heat resistance and hydrolysis resistance. From the viewpoint of preventing yellowing by sunlight of the present invention, it is preferable to use an aliphatic polycarbonate polyol.
  • Examples of the aliphatic polycarbonate polyol include aliphatic polycarbonate diols and aliphatic polycarbonate triols, and aliphatic polycarbonate diols can be preferably used.
  • Examples of the aliphatic polycarbonate diol that is a component of the urethane resin of the present invention include ethylene glycol, propylene glycol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, and 3-methyl.
  • aliphatic polycarbonate diol obtained by reacting one or more diols such as cyclohexanedimethanol with carbonates such as dimethyl carbonate, diphenyl carbonate, ethylene carbonate, and phosgene. It is below.
  • the number average molecular weight of the aliphatic polycarbonate diol is preferably 1500 to 4000, more preferably 2000 to 3000.
  • the ratio of the aliphatic polycarbonate component constituting the urethane resin is relatively small. Therefore, in order to make the ratio (A 1460 / A 1530 ) within the above range, it is preferable to control the number average molecular weight of the aliphatic polycarbonate diol within the above range.
  • the absorbance (A 1460 ) near 1460 cm ⁇ 1 derived from the aliphatic polycarbonate component increases and the aliphatic component increases. The strength after processing may be reduced.
  • the number average molecular weight of the aliphatic polycarbonate diol is small, a strong urethane component increases, and stress due to thermal shrinkage of the base material cannot be relieved, and adhesiveness may be lowered.
  • aromatic aliphatic diisocyanates such as xamethylene diisocyanate and aliphatic diisocyanates such as 2,2,4-trimethylhexamethylene diisocyanate, or a poly (polysiloxane) obtained by adding one or more of these compounds with trimethylolpropane or the like in advance. Isocyanates.
  • Chain extenders include glycols such as ethylene glycol, diethylene glycol, 1,4-butanediol, neopentyl glycol and 1,6-hexanediol, polyhydric alcohols such as glycerin, trimethylolpropane, and pentaerythritol, ethylenediamine Diamines such as hexamethylenediamine and piperazine, aminoalcohols such as monoethanolamine and diethanolamine, thiodiglycols such as thiodiethylene glycol, and water.
  • glycols such as ethylene glycol, diethylene glycol, 1,4-butanediol, neopentyl glycol and 1,6-hexanediol
  • polyhydric alcohols such as glycerin, trimethylolpropane, and pentaerythritol
  • ethylenediamine Diamines such as hexamethylenediamine and piperazine
  • a chain extender having a short main chain when used, the absorbance (A 1530 ) in the vicinity of 1530 cm ⁇ 1 derived from the urethane component increases, and the flexibility of the coating layer may decrease. Therefore, a chain extender having a long main chain is preferable. From the viewpoint of imparting the flexibility of the coating layer, an aliphatic diol or diamine chain extender having a length of 4 to 10 carbon atoms in the main chain is preferred. From these points, 1,4-butanediol, 1,6-hexanediol, hexamethylenediamine and the like are preferable as the chain extender used in the present invention.
  • the coating method of the coating layer of the present invention is not particularly limited, and various off-line coating methods and in-line coating methods can be employed. However, from the viewpoint of productivity and environmental protection, the coating layer of the present invention is preferably provided by an in-line coating method described later using an aqueous coating solution. In this case, it is desirable that the urethane resin of the present invention is water-soluble.
  • the “water-soluble” means that it dissolves in water or an aqueous solution containing less than 50% by mass of a water-soluble organic solvent.
  • a sulfonic acid (salt) group or a carboxylic acid (salt) group can be introduced (copolymerized) into the urethane molecular skeleton. Since the sulfonic acid (salt) group is strongly acidic and it may be difficult to maintain moisture resistance due to its hygroscopic performance, it is preferable to introduce a weakly acidic carboxylic acid (salt) group. Moreover, nonionic groups, such as a polyoxyalkylene group, can also be introduced.
  • a polyol compound having a carboxylic acid group such as dimethylolpropionic acid or dimethylolbutanoic acid is introduced as a copolymer component to form a salt.
  • the salt forming agent include trialkylamines such as ammonia, trimethylamine, triethylamine, triisopropylamine, tri-n-propylamine, and tri-n-butylamine, N such as N-methylmorpholine and N-ethylmorpholine.
  • -N-dialkylalkanolamines such as alkylmorpholines, N-dimethylethanolamine and N-diethylethanolamine. These can be used alone or in combination of two or more.
  • the composition molar ratio of the polyol compound having a carboxylic acid (salt) group in the urethane resin is the same as that of the urethane resin.
  • the total polyisocyanate component is 100 mol%, it is preferably 3 to 60 mol%, more preferably 5 to 40 mol%. If the composition molar ratio is less than 3 mol%, water dispersibility may be difficult. Moreover, when the said composition molar ratio exceeds 60 mol%, since water resistance falls, moist heat resistance may fall.
  • the glass transition temperature of the urethane resin of the present invention is preferably less than 0 ° C, more preferably less than -5 ° C.
  • the viscosity is close to that of partially melted olefin resin such as EVA or PVB at the time of pressure bonding, contributing to the improvement of strong adhesiveness by partial mixing, From the viewpoint of stress relaxation of the coating layer, it is preferable because it is easy to achieve suitable flexibility.
  • a crosslinking group may be introduced into the resin itself in order to improve adhesion after high temperature and high humidity.
  • a silanol group is preferred from the viewpoint of the stability over time of the coating solution and the effect of improving the crosslinking density.
  • a resin other than the urethane resin of the present invention may be contained in order to improve adhesiveness.
  • a urethane resin, an acrylic resin, a polyester resin, or the like containing polyether or polyester as a constituent component can be used.
  • the coating layer can contain a crosslinking agent as a main component together with the urethane resin.
  • a crosslinking agent By including a crosslinking agent, it becomes possible to further improve the adhesiveness under high temperature and high humidity. Moreover, when making it heat-press by high temperature for a short time, the fall of the base-material adhesiveness by EVA erosion can be prevented. Therefore, highly versatile and easy-to-adhere that can be applied under various bonding conditions.
  • the crosslinking agent those that react with a carboxylic acid group, a hydroxyl group, an amino group, etc.
  • an amide bond, a urethane bond, or a urea bond are preferable because they are not easily deteriorated by high-temperature and high-humidity treatment.
  • an ester bond or an ether bond is involved, it may be hydrolyzable, which is not preferable.
  • the crosslinking agent suitably used in the present invention include melamine-based, isocyanate-based, carbodiimide-based, and oxazoline-based. Among these, an isocyanate type and a carbodiimide type are preferable from the viewpoint of the stability over time of the coating liquid and the effect of improving the adhesiveness under high temperature and high humidity treatment.
  • an isocyanate-based crosslinking agent from the viewpoint that the coating layer has appropriate flexibility and suitably imparts the stress relaxation action of the coating layer.
  • a catalyst etc. are used suitably as needed.
  • content of a crosslinking agent 5 mass% or more and 90 mass% or less are preferable with respect to urethane resin. More preferably, it is 10 mass% or more and 50 mass% or less. If the amount is small, the strength of the coating layer under high temperature and high humidity may decrease, and the adhesiveness may decrease. Adhesiveness may be reduced.
  • crosslinking agents may be mixed in order to improve the coating film strength.
  • a catalyst etc. are used suitably as needed.
  • particles may be contained in the coating layer.
  • Particles are (1) silica, kaolinite, talc, light calcium carbonate, heavy calcium carbonate, zeolite, alumina, barium sulfate, carbon black, zinc oxide, zinc sulfate, zinc carbonate, titanium dioxide, satin white, aluminum silicate, diatomaceous earth
  • Inorganic particles such as soil, calcium silicate, aluminum hydroxide, hydrous halloysite, magnesium carbonate, magnesium hydroxide, (2) acrylic or methacrylic, vinyl chloride, vinyl acetate, nylon, styrene / acrylic, styrene / Butadiene, polystyrene / acrylic, polystyrene / isoprene, polystyrene / isoprene, methyl methacrylate / butyl methacrylate, melamine, polycarbonate, urea, epoxy, urethane, phenol, di Rirufutareto systems include organic particles of polyester
  • the particles preferably have an average particle diameter of 1 to 500 nm.
  • the average particle size is not particularly limited, but is preferably 1 to 100 nm from the viewpoint of maintaining the transparency of the film.
  • the particles may contain two or more kinds of particles having different average particle diameters.
  • said average particle diameter measures the maximum diameter of the 10 or more particle
  • the particle content is preferably 0.5% by mass or more and 20% by mass or less.
  • the amount is small, sufficient blocking resistance cannot be obtained. Further, scratch resistance is deteriorated.
  • the amount is large, the coating film strength decreases.
  • the coating layer may contain a surfactant for the purpose of improving leveling properties during coating and defoaming the coating solution.
  • the surfactant may be any of cationic, anionic and nonionic surfactants, but is preferably a silicon-based, acetylene glycol-based or fluorine-based surfactant. These surfactants are preferably contained in a range that does not impair the adhesion to the sealing material, for example, in the range of 0.005 to 0.5 mass% in the coating solution.
  • additives may be contained within a range that does not impair the adhesion with the sealing material.
  • the additive include fluorescent dyes, fluorescent brighteners, plasticizers, ultraviolet absorbers, pigment dispersants, foam suppressors, antifoaming agents, preservatives, and antistatic agents.
  • a method of providing a coating layer on a polyester film a method of coating and drying a coating solution containing a solvent, particles and a resin on the polyester film can be mentioned.
  • the solvent include organic solvents such as toluene, water, or a mixed system of water and a water-soluble organic solvent.
  • water alone or a mixture of a water-soluble organic solvent and water is used from the viewpoint of environmental problems. preferable.
  • PET film Polyethylene terephthalate
  • the PET resin After sufficiently drying the PET resin in a vacuum, it is supplied to an extruder, melted and extruded at about 280 ° C. from a T-die into a rotating cooling roll into a sheet, cooled and solidified by an electrostatic application method, and unstretched PET. Get a sheet.
  • the unstretched PET sheet may have a single layer structure or a multilayer structure by a coextrusion method.
  • the obtained unstretched PET sheet is stretched 2.5 to 5.0 times in the longitudinal direction with a roll heated to 80 to 120 ° C. to obtain a uniaxially stretched PET film. Further, the end of the film is gripped with a clip, led to a hot air zone heated to 70 to 140 ° C., and stretched 2.5 to 5.0 times in the width direction. Subsequently, the film is guided to a heat treatment zone of 160 to 240 ° C., and heat treatment is performed for 1 to 60 seconds to complete crystal orientation.
  • a coating solution is applied to at least one surface of the PET film to form the coating layer.
  • the solid concentration of the resin composition in the coating solution is preferably 2 to 35% by weight, particularly preferably 4 to 15% by weight.
  • any known method can be used as a method for applying this coating solution to the PET film.
  • reverse roll coating method gravure coating method, kiss coating method, die coater method, roll brush method, spray coating method, air knife coating method, wire bar coating method, pipe doctor method, impregnation coating method, curtain coating method, etc. It is done. These methods are applied alone or in combination.
  • the coating layer is formed by applying the coating solution to an unstretched or uniaxially stretched PET film, drying it, stretching it at least in a uniaxial direction, and then performing a heat treatment. Since the adhesion between the coating layer and the polyester film substrate is further improved by the in-line coating method for forming the coating layer during film formation, it is preferable in terms of improving the adhesion with the sealing material after high temperature and high humidity.
  • the thickness of the finally obtained coating layer is preferably 10 to 3000 nm, more preferably 10 to 1000 nm, still more preferably 10 to 500 nm, and still more preferably 10 to 400 nm.
  • the coating amount after drying of the coating layer is preferably 0.01 to 3 g / m 2 , more preferably 0.01 to 1 g / m 2 , further preferably 0.01 to 0.5 g / m 2 , and more. More preferably, it is 0.01 to 0.4 g / m 2 .
  • the coating amount of the coating layer is less than 0.01 g / m 2 , the effect on adhesiveness is almost lost. On the other hand, when the coating amount exceeds 3 g / m 2 , the blocking resistance is lowered.
  • the back sheet for solar cell of the present invention comprises a polyester film having the coating layer as a constituent member.
  • it is preferably used for the outermost layer that is in direct contact with the sealing material.
  • the solar cell backsheet of the present invention can exhibit strong adhesion to the encapsulant, and can exhibit good adhesion even under harsh environments over a long period of time. Therefore, it can contribute to moisture proof maintenance and barrier property improvement of the solar cell element.
  • a polyester film / adhesive / metal foil having a coating layer or a film / adhesive / polyvinyl fluoride film having a metal-based thin film layer or a polyester-based highly durable moisture-proof A configuration such as a film is exemplified.
  • the polyester film of the present invention may have a configuration having the coating layer on both sides.
  • the coating layer of the present invention can exhibit good adhesiveness with configurations other than the sealing material.
  • a film having a metal foil or a metal thin film layer a film having a water vapor barrier property can be suitably used.
  • the metal examples include aluminum, tin, magnesium, silver, and stainless steel. Among them, aluminum and silver are preferable because they have a relatively high reflectance and are easily available industrially.
  • the metal layer may be used as a metal foil, or may be laminated as a thin film on a polyester film or the like. As a method of laminating these metals as a thin film, a vacuum deposition method, a sputtering method, an ion plating method, a plasma vapor deposition method (CVD), or the like can be used.
  • each layer of the polyester film having the coating layer, the metal foil or the metal-based thin film layer, the polyvinyl fluoride film or the polyester-based high durability moisture-proof film is integrally laminated by vacuum suction or the like and heat-pressed.
  • a solar cell backsheet can be produced by thermocompression-bonding each of the above-mentioned layers as an integral molded body using a normal molding method such as the cation method.
  • the adhesive include (meth) acrylic resins, olefinic resins, vinyl resins, and other heat melting adhesives, solvent-based adhesives, photo-curing adhesives, etc. whose main component is a vehicle. It is done.
  • the high durability moisture-proof film is laminated for the purpose of improving the weather resistance.
  • the high durability moisture-proof film include polytetrafluoroethylene (PTFE), 4-fluoroethylene-perchloroalkoxy copolymer.
  • Polymer (PFA) 4-Fluoroethylene-6-Fluoropropylene Copolymer (FEP), 2-Ethylene-4 Fluoroethylene Copolymer (ETFE), Poly-3-Fluoroethylene (PCTFE), Polyfluoride Fluorine resin film such as vinylidene (PVDF) or polyfuca vinyl (PVF), or UV absorber for resin such as polycarbonate, polymethyl methacrylate, polyacrylate, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), acrylic A film made of a kneaded resin composition It is.
  • PVDF vinylidene
  • PEN polyfuca vinyl
  • the solar cell module uses, for example, a glass substrate, a solar cell element as a photovoltaic element provided with wiring, a sealing material interposed so as to sandwich the solar cell element, and the solar cell backsheet of the present invention.
  • a sealant an olefin resin such as an ethylene / vinyl acetate copolymer or a polyvinyl butyral resin is preferably used.
  • the coating layer of the present invention since the coating layer of the present invention has such flexibility, it can exhibit good adhesiveness with a sealing material such as an ethylene / vinyl acetate copolymer or a polyvinyl butyral resin.
  • Sealing materials are classified into a standard cure type that cures by a curing process in an oven provided in a separate line after thermocompression bonding in the laminating process, and a fast cure type that cures inside the laminator in the laminating process. However, either can be applied.
  • an olefin resin such as an ethylene / vinyl acetate copolymer or a polyvinyl butyral resin is used.
  • the “main component” means that 50% by mass or more, more preferably 70% by mass or more of the sealant is contained.
  • a crosslinking agent or a reaction initiator for causing the crosslinking reaction to proceed is added.
  • 2,5-dimethylhexane-2,5-dihydroxyperoxide, 2,5-dimethyl-2,5-di (t-butylperoxy) hexyne-3, di-t Organic peroxides such as -butyl peroxide, t-butylcumyl peroxide, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane are used.
  • a photosensitizer such as benzophenone, methyl orthobenzoylbenzoate or benzoin ether is used.
  • a silane coupling agent may be blended in consideration of adhesion to the glass substrate.
  • an epoxy group-containing compound is added for the purpose of promoting adhesion and curing.
  • the epoxy group-containing compound include triglycidyl tris (2-hydroxyethyl) isocyanurate, neopentyl glycol diglycidyl ether, and 1,6-hexanediol.
  • Epoxy group-containing compounds such as diglycidyl ether, acrylic glycidyl ether, and 2-ethylhexyl glycidyl ether are used.
  • the infrared spectrum of the coating layer was determined as the difference spectrum between the infrared spectrum obtained from the coating layer sample piece and the spectrum of the blank sample piece.
  • Absorbance around 1460 cm -1 derived from an aliphatic polycarbonate component (A 1460) is 1460 and the value of the absorption peak height having an absorption maximum in the region of ⁇ 10 cm -1
  • the absorbance in the vicinity of 1530 cm -1 derived from urethane component (A 1530 ) is the value of the absorption peak height having an absorption maximum in the region of 1530 ⁇ 10 cm ⁇ 1 .
  • the baseline was a line connecting the hems on both sides of each maximum absorption peak.
  • the prepared easy-adhesive white polyester film for solar cells was prepared by cutting out a 100 mm width ⁇ 100 mm length and an EVA sheet 70 mm width ⁇ 90 mm length, and the film (coating layer surface) / EVA / (Coating layer surface)
  • a sample was prepared by stacking with a film structure and heat-pressing with a vacuum laminator under the bonding conditions described below.
  • the prepared sample was cut out into a width of 20 mm and a length of 100 mm, attached to a SUS plate, and the peel strength between the film layer and the EVA layer was measured with a tensile tester under the conditions described below.
  • the peel strength was determined as the average value of the portions that peeled stably after exceeding the maximum point.
  • the ranking was based on the following criteria. ⁇ : 100 N / 20 mm or more, or film breakage of film ⁇ : 75 N / 20 mm or more, less than 100 N / 20 mm ⁇ : 50 N / 20 mm or more, less than 75 N / 20 mm ⁇ : less than 50 N / 20 mm
  • a water-soluble polyurethane resin having a solid content of 35% was obtained in the same manner except that the polyhexamethylene carbonate diol having a number average molecular weight of 2000 in the water-soluble polyurethane resin (A-1) was changed to a polyhexamethylene carbonate diol having a number average molecular weight of 1000.
  • a solution (A-5) was obtained.
  • a water-soluble polyurethane resin having a solid content of 35% was obtained in the same manner except that the polyhexamethylene carbonate diol having a number average molecular weight of 2000 in the water-soluble polyurethane resin (A-1) was changed to a polyhexamethylene carbonate diol having a number average molecular weight of 5000.
  • a solution (A-6) was obtained.
  • a water-soluble polyurethane resin solution (A) having a solid content of 35% was prepared in the same manner except that the polyhexamethylene carbonate diol having a number average molecular weight of 2000 in the water-soluble polyurethane resin (A-1) was changed to a polyester diol having a number average molecular weight of 2000. -7) was obtained.
  • Polymerization of block polyisocyanate crosslinking agent 100 parts by mass of a polyisocyanate compound having an isocyanurate structure using hexamethylene diisocyanate as a raw material (manufactured by Asahi Kasei Chemicals, Duranate TPA) in a flask equipped with a stirrer, a thermometer and a reflux condenser, 55 parts by mass of propylene glycol monomethyl ether acetate, 30 parts by mass of polyethylene glycol monomethyl ether (average molecular weight 750) was charged and held at 70 ° C. for 4 hours in a nitrogen atmosphere.
  • a polyisocyanate compound having an isocyanurate structure using hexamethylene diisocyanate as a raw material manufactured by Asahi Kasei Chemicals, Duranate TPA
  • reaction solution temperature was lowered to 50 ° C., and 47 parts by mass of methyl ethyl ketoxime was added dropwise.
  • the infrared spectrum of the reaction solution was measured to confirm that the absorption of the isocyanate group had disappeared, and a block polyisocyanate aqueous dispersion (B) having a solid content of 75% by mass was obtained.
  • a dropping funnel 16 parts by mass of 2-isopropenyl-2-oxazoline as a polymerizable unsaturated monomer having an oxazoline group, methoxypolyethylene glycol acrylate (average number of moles of ethylene glycol added: 9 moles, Shin Nakamura Chemical)
  • methoxypolyethylene glycol acrylate average number of moles of ethylene glycol added: 9 moles, Shin Nakamura Chemical
  • Example 1 Adjustment of coating liquid The following coating agent was mixed and the coating liquid was created. Water 55.86% by mass Isopropanol 30.00% by mass Polyurethane resin solution (A-1) 13.52% by mass 0.59% by mass of particles (Silica sol with an average particle size of 40 nm, solid content concentration of 40% by mass) Surfactant 0.03 mass% (Silicon, solid content concentration of 100% by mass)
  • PET resin pellet inherent viscosity is 0.62 dl / g
  • silica particles having an average particle diameter of 2.5 ⁇ m as a film raw material polymer is 133 Pa.
  • it supplied to the extruder and melt
  • Each of the PET resins was filtered through a stainless steel filter medium (nominal filtration accuracy: 10 ⁇ m particle 95% cut) and melt extruded into a sheet. It was quenched and solidified on a rotating cooling metal roll maintained at a surface temperature of 30 ° C. to obtain an unstretched PET sheet.
  • the unstretched PET sheet was heated to 100 ° C. with a heated roll group and an infrared heater, and then stretched 3.5 times in the longitudinal direction with a roll group having a difference in peripheral speed to obtain a uniaxially stretched PET film.
  • Experimental example 1 An easily adhesive polyester film for solar cells was obtained in the same manner as in Example 1 except that the polyurethane resin was changed to the polyurethane resin (A-5).
  • Experimental example 2 A reester film for a 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).
  • Comparative Example 1 An easy-adhesive polyester film for solar cells was obtained in the same manner as in Example 1 except that the polyurethane resin was changed to polyurethane resin (A-7).
  • Comparative Example 2 An easily adhesive polyester film for solar cells was obtained in the same manner as in Example 1 except that the polyurethane resin was changed to the polyurethane resin (A-8).
  • Comparative Example 3 A solar cell easy-adhesive polyester film was obtained in the same manner as in Example 1 except that the substrate thickness of the solar cell easy-adhesive polyester film was changed to 5 ⁇ m.
  • Example 2 An easily adhesive polyester film for solar cells was obtained in the same manner as in Example 1 except that the polyurethane resin was changed to the polyurethane resin (A-2).
  • Example 3 An easy-adhesive polyester film for solar cells was obtained in the same manner as in Example 1 except that the polyurethane resin was changed to the polyurethane resin (A-3).
  • Example 4 An easy-adhesive polyester film for solar cells was obtained in the same manner as in Example 1 except that the polyurethane resin was changed to a silanol group-containing polyurethane resin (A-4).
  • Example 5 An easy-adhesive polyester film for solar cells was obtained in the same manner as in Example 1 except that the substrate thickness of the easy-adhesive polyester film for solar cells was changed to 50 ⁇ m.
  • Example 6 An easy-adhesive polyester film for solar cells was obtained in the same manner as in Example 1 except that the substrate thickness of the easy-adhesive polyester film for solar cells was changed to 100 ⁇ m.
  • Example 7 An easy-adhesive polyester film for solar cells was obtained in the same manner as in Example 1 except that the substrate thickness of the easy-adhesive polyester film for solar cells was changed to 350 ⁇ m.
  • Example 8 Except having changed the coating liquid into the following, it carried out similarly to Example 1, and obtained the easily adhesive polyester film for solar cells. 61.51% by mass of water Isopropanol 30.00% by mass Polyurethane resin solution (A-1) 8.11% by mass 0.35% by mass of particles (Silica sol with an average particle size of 40 nm, solid content concentration of 40% by mass) Surfactant 0.03 mass% (Silicon, solid content concentration of 100% by mass)
  • Example 9 Except having changed the coating liquid into the following, it carried out similarly to Example 1, and obtained the easily adhesive polyester film for solar cells.
  • Polyurethane resin solution (A-1) 27.05% by mass 1.18% by mass of particles (Silica sol with an average particle size of 40 nm, solid content concentration of 40% by mass)
  • Surfactant 0.06% by mass Surfactant 0.06% by mass (Silicon, solid content concentration of 100% by mass)
  • Example 11 An easily adhesive polyester film for solar cells was obtained in the same manner as in Example 1 except that the polyurethane resin was changed to the polyurethane resin (A-9).
  • Example 12 An easily adhesive polyester film for solar cells was obtained in the same manner as in Example 1 except that the polyurethane resin was changed to the polyurethane resin (A-10).
  • Example 13 Manufacture of solar cell backsheet
  • the dry-lamination method used in Example 11 was an adhesive polyester film for solar cell / white polyester film (50 ⁇ m) / aluminum foil (30 ⁇ m) / polyvinyl fluoride film (38 ⁇ m).
  • the solar cell back sheet was obtained by bonding.
  • Example 14 (1) Adjustment of coating liquid The following coating agent was mixed and the coating liquid was created. Water 55.86% by mass Isopropanol 30.00% by mass Polyurethane resin solution (A-1) 13.52% by mass 0.59% by mass of particles (Silica sol with an average particle size of 40 nm, solid content concentration of 40% by mass) Surfactant 0.03 mass% (Silicon, solid content concentration of 100% by mass)
  • Silica particle-containing polyethylene terephthalate resin was polymerized by a conventional method to produce polyethylene terephthalate (raw material b) having an intrinsic viscosity of 0.62 dl / g and containing 500 ppm of agglomerated silica particles (average particle diameter of 2.0 ⁇ m).
  • Tianium oxide particle-containing masterbatch c Tianium oxide particle-containing masterbatch c
  • the above polyethylene terephthalate (raw material b) and anatase-type titanium dioxide particles (manufactured by Sakai Chemical Industry Co., Ltd.) having an average particle size of 0.2 ⁇ m are mixed at a mass ratio of 50/50, kneaded with a vent type kneading extruder, A master batch (raw material c) containing titanium particles was produced.
  • the B layer was bonded to both sides of the A layer so as to have the same thickness.
  • 10 degreeC air was sprayed on the opposite surface of the molten polymer extruded on the cooling drum, and the molten polymer was cooled and solidified from both surfaces.
  • 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.
  • a condensing infrared heater was installed in the middle of the low-speed roll and the high-speed roll at a position facing each other across the film, and a sufficient amount of heat necessary to uniformly stretch the film was given evenly from both sides of the film. .
  • the film was introduced into a tenter, and stretched 3.9 times in the width direction while heating from 120 ° C to 150 ° C. Further, heat treatment was performed by blowing hot air of 220 ° C. for 30 seconds in the tenter. Thereafter, a 2% relaxation treatment is applied in the width direction while gradually cooling to room temperature over 40 seconds, and a void-containing laminated biaxially oriented solar cell having an apparent density of 1.10 g / cm 3 and a thickness of 250 ⁇ m. An easily adhesive white polyester film was obtained. The evaluation results are shown in Table 2.
  • Example 15 An easy-adhesive white polyester film for solar cells was obtained in the same manner as in Example 14 except that the polyurethane resin was changed to the polyurethane resin (A-2).
  • Example 16 An easily adhesive white polyester film for solar cells was obtained in the same manner as in Example 14 except that the polyurethane resin was changed to the polyurethane resin (A-3).
  • Example 17 An easily adhesive white polyester film for solar cells was obtained in the same manner as in Example 14 except that the polyurethane resin was changed to a silanol group-containing polyurethane resin (A-4).
  • Example 18 An easy-adhesive polyester film for solar cells was obtained in the same manner as in Example 14 except that the polyurethane resin was changed to polyurethane resin (A-9).
  • Example 19 An easily adhesive polyester film for solar cells was obtained in the same manner as in Example 14 except that the polyurethane resin was changed to polyurethane resin (A-10).
  • Example 20 (1) Adjustment of coating liquid The following coating agent was mixed and the coating liquid was created. Water 55.62% by mass Isopropanol 30.00% by mass Polyurethane resin solution (A-1) 11.29% by mass Block polyisocyanate aqueous dispersion (B) 2.26% by mass Particles 0.71% by mass (Silica sol with an average particle size of 40 nm, solid content concentration of 40% by mass) 0.07% by mass of particles (Silica sol with an average particle size of 450 nm, solid content concentration of 40% by mass) Surfactant 0.05% by mass (Silicon, solid content concentration of 100% by mass)
  • PET resin pellet inherent viscosity is 0.62 dl / g
  • silica particles having an average particle diameter of 2.5 ⁇ m as a film raw material polymer is 133 Pa.
  • it supplied to the extruder and melt
  • Each of the PET resins was filtered through a stainless steel filter medium (nominal filtration accuracy: 10 ⁇ m particle 95% cut) and melt extruded into a sheet. It was quenched and solidified on a rotating cooling metal roll maintained at a surface temperature of 30 ° C. to obtain an unstretched PET sheet.
  • the unstretched PET sheet was heated to 100 ° C. with a heated roll group and an infrared heater, and then stretched 3.5 times in the longitudinal direction with a roll group having a difference in peripheral speed to obtain a uniaxially stretched PET film.
  • Comparative Example 4 An 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-7).
  • Comparative Example 5 An easily 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-8).
  • Comparative Example 6 An easy-adhesive polyester film for solar cells was obtained in the same manner as in Example 20 except that the substrate thickness of the easy-adhesive polyester film for solar cells was changed to 5 ⁇ m.
  • Example 21 Except having changed the coating liquid into the following, it carried out similarly to Example 20, and obtained the easily adhesive polyester film for solar cells.
  • Polyurethane resin solution (A-1) 9.47% by mass
  • Block polyisocyanate aqueous dispersion (B) 1.89 mass% 0.59% by mass of particles (Silica sol with an average particle size of 40 nm, solid content concentration of 40% by mass)
  • Surfactant 0.03 mass% (Silicon, solid content concentration of 100% by mass)
  • Example 22 Except having changed the coating liquid into the following, it carried out similarly to Example 20, and obtained the easily adhesive polyester film for solar cells. 54.75% by mass of water Isopropanol 30.00% by mass Polyurethane resin solution (A-1) 12.99% by mass Block polyisocyanate aqueous dispersion (B) 1.52% by mass Particles 0.71% by mass (Silica sol with an average particle size of 40 nm, solid content concentration of 40% by mass) Surfactant 0.03 mass% (Silicon, solid content concentration of 100% by mass)
  • Example 23 Except having changed the coating liquid into the following, it carried out similarly to Example 20, and obtained the easily adhesive polyester film for solar cells.
  • Polyurethane resin solution (A-1) 8.12% by mass
  • Block polyisocyanate aqueous dispersion (B) 3.79% by mass Particles 0.71% by mass (Silica sol with an average particle size of 40 nm, solid content concentration of 40% by mass)
  • Surfactant 0.03 mass% (Silicon, solid content concentration of 100% by mass)
  • Example 24 Except having changed the coating liquid into the following, it carried out similarly to Example 20, and obtained the easily adhesive polyester film for solar cells.
  • Polyurethane resin solution (A-1) 3.25% by mass
  • Block polyisocyanate aqueous dispersion (B) 6.06% by mass Particles 0.71% by mass (Silica sol with an average particle size of 40 nm, solid content concentration of 40% by mass)
  • Surfactant 0.03 mass% (Silicon, solid content concentration of 100% by mass)
  • Example 25 Except having changed the coating liquid into the following, it carried out similarly to Example 20, and obtained the easily adhesive polyester film for solar cells. 60.82% by mass of water Isopropanol 30.00% by mass Polyurethane resin solution (A-1) 1.62% by mass Block polyisocyanate aqueous dispersion (B) 6.82 mass% Particles 0.71% by mass (Silica sol with an average particle size of 40 nm, solid content concentration of 40% by mass) Surfactant 0.03 mass% (Silicon, solid content concentration of 100% by mass)
  • Example 26 An easily 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-2).
  • Example 27 An easily 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-3).
  • Example 28 An 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 a silanol group-containing polyurethane resin (A-4).
  • Example 29 An easily adhesive polyester film for solar cells was obtained in the same manner as in Example 20 except that the block polyisocyanate aqueous dispersion (B) was changed to a water-soluble resin (C) having an oxazoline group.
  • Example 30 An easily adhesive polyester film for solar cells was obtained in the same manner as in Example 20 except that the block polyisocyanate aqueous dispersion (C) was changed to the carbodiimide water-soluble resin (D).
  • Example 31 An easily adhesive polyester film for solar cells was obtained in the same manner as in Example 20 except that the block polyisocyanate aqueous dispersion (C) was changed to imino / methylolmelamine (solid content concentration: 70% by mass).
  • Example 32 An easily adhesive polyester film for solar cells was obtained in the same manner as in Example 20 except that the substrate thickness of the easily adhesive polyester film for solar cells was changed to 50 ⁇ m.
  • Example 33 An easy-adhesive polyester film for solar cells was obtained in the same manner as in Example 20 except that the substrate thickness of the easy-adhesive polyester film for solar cells was changed to 100 ⁇ m.
  • Example 34 A solar cell easy-adhesive polyester film was obtained in the same manner as in Example 20, except that the substrate thickness of the solar cell easy-adhesive polyester film was changed to 350 ⁇ m.
  • Example 35 Except having changed the coating liquid into the following, it carried out similarly to Example 20, and obtained the easily adhesive polyester film for solar cells. 62.82% by mass of water Isopropanol 30.00% by mass Polyurethane resin solution (A-1) 5.67% by mass Block polyisocyanate aqueous dispersion (B) 1.13% by mass 0.35% by mass of particles (Silica sol with an average particle size of 40 nm, solid content concentration of 40% by mass) Surfactant 0.03% by mass (Silicon, solid content concentration of 100% by mass)
  • Example 36 Except having changed the coating liquid into the following, it carried out similarly to Example 20, and obtained the easily adhesive polyester film for solar cells.
  • Polyurethane resin solution (A-1) 18.99% by mass
  • Block polyisocyanate aqueous dispersion (B) 3.80% by mass 1.19% by mass of particles (Silica sol with an average particle size of 40 nm, solid content concentration of 40% by mass)
  • Surfactant 0.03 mass% (Silicon, solid content concentration of 100% by mass)
  • Example 37 Manufacture of back sheet for solar cell
  • the solar cell back sheet was obtained by bonding.
  • Example 38 An 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 polyurethane resin (A-9).
  • Example 39 An easily 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-10).
  • Example 40 Manufacture of solar cell backsheet A dry laminate method with a configuration of easily adhesive polyester film for solar cell / black polyester film (50 ⁇ m) / aluminum foil (30 ⁇ m) / polyvinyl fluoride film (38 ⁇ m) of Example 38.
  • the solar cell back sheet was obtained by bonding.
  • Example 37 About the solar cell backsheets of Example 37 and Example 40, an ISUZAWA UV Tester SUV-W151 manufactured by Iwasaki Electric Co., Ltd. was used with the easily adhesive polyester film surface for solar cells as an irradiation surface, and a temperature of 63 ° C, 50% Rh Continuous UV irradiation treatment was performed for 100 hours at an irradiation intensity of 100 mW / cm 2 .
  • the solar cell backsheet of Example 37 was slightly yellowed, but on the entire surface of the solar cell backsheet of Example 40. There was no change in color, and a good appearance was maintained.
  • Example 41 Adjustment of coating liquid The following coating agent was mixed and the coating liquid was created. Water 55.62% by mass Isopropanol 30.00% by mass Polyurethane resin solution (A-1) 11.29% by mass Block polyisocyanate aqueous dispersion (B) 2.26% by mass Particles 0.71% by mass (Silica sol with an average particle size of 40 nm, solid content concentration of 40% by mass) 0.07% by mass of particles (Silica sol with an average particle size of 450 nm, solid content concentration of 40% by mass) Surfactant 0.05% by mass (Silicon, solid content concentration of 100% by mass)
  • Silica particle-containing polyethylene terephthalate resin was polymerized by a conventional method to produce polyethylene terephthalate (raw material b) having an intrinsic viscosity of 0.62 dl / g and containing 500 ppm of agglomerated silica particles (average particle diameter of 2.0 ⁇ m).
  • Tianium oxide particle-containing masterbatch c Tianium oxide particle-containing masterbatch c
  • the above polyethylene terephthalate (raw material b) and anatase-type titanium dioxide particles (manufactured by Sakai Chemical Industry Co., Ltd.) having an average particle size of 0.2 ⁇ m are mixed at a mass ratio of 50/50, kneaded with a vent type kneading extruder, A master batch (raw material c) containing titanium particles was produced.
  • the B layer was bonded to both sides of the A layer so as to have the same thickness.
  • 10 degreeC air was sprayed on the opposite surface of the molten polymer extruded on the cooling drum, and the molten polymer was cooled and solidified from both surfaces.
  • 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.
  • a condensing infrared heater was installed in the middle of the low-speed roll and the high-speed roll at a position facing each other across the film, and a sufficient amount of heat necessary to uniformly stretch the film was given evenly from both sides of the film. .
  • the film was introduced into a tenter, and stretched 3.9 times in the width direction while heating from 120 ° C to 150 ° C. Further, heat treatment was performed by blowing hot air of 220 ° C. for 30 seconds in the tenter. Thereafter, a 2% relaxation treatment is applied in the width direction while gradually cooling to room temperature over 40 seconds, and a void-containing laminated biaxially oriented solar cell having an apparent density of 1.10 g / cm 3 and a thickness of 250 ⁇ m. An easily adhesive white polyester film was obtained. The evaluation results are shown in Table 4.
  • Example 42 An easy-adhesive white polyester film 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).
  • Example 43 An easy-adhesive white polyester film 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-3).
  • Example 44 An easy-adhesive white polyester film for solar cells was obtained in the same manner as in Example 41 except that the polyurethane resin was changed to a silanol group-containing polyurethane resin (A-4).
  • Example 45 An easily adhesive polyester film 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-9).
  • Example 46 An easy-adhesive polyester film for solar cells was obtained in the same manner as in Example 41 except that the polyurethane resin was changed to polyurethane resin (A-10).
  • the easily adhesive polyester film for solar cells of the present invention is excellent in adhesiveness with a sealing material and adhesiveness (moisture and heat resistance) under high temperature and high humidity, it is used as an innermost base film of a solar cell backsheet. Is preferred.

Abstract

L'invention concerne un film de polyester à collage facile, pour des cellules solaires, qui présente une excellente adhésivité, et une feuille de support l'utilisant. L'invention porte sur un film de polyester qui porte une couche de revêtement sur au moins une surface de celui-ci et dont l'épaisseur de la feuille de base est de 20 à 500 μm, la couche de revêtement comportant, en tant que composant principal, une résine d'uréthane contenant un polycarbonate polyol aliphatique en tant que composant constitutif et présentant, en spectroscopie infrarouge, un rapport de l'absorbance au voisinage de 1460 cm-1 à celle au voisinage de 1530 cm-1 de 0,70 à 1,60, la première absorbance étant attribuable au composant polycarbonate aliphatique et la dernière au composant uréthane.
PCT/JP2010/071513 2009-12-02 2010-12-01 Film de polyester à collage facile pour cellules solaires WO2011068132A1 (fr)

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JP2013008883A (ja) * 2011-06-27 2013-01-10 Mitsubishi Plastics Inc 太陽電池裏面封止材用ポリエステルフィルム
JP2013021273A (ja) * 2011-07-14 2013-01-31 Fujifilm Corp 太陽電池用バックシート及び太陽電池モジュール
JP2013253189A (ja) * 2012-06-08 2013-12-19 Toyobo Co Ltd 易接着フィルムおよびその製造方法
US20150068601A1 (en) * 2012-03-14 2015-03-12 Toyobo Co., Ltd. Sealing sheet for back surface of solar cell, and solar cell module
WO2016146982A1 (fr) * 2015-03-13 2016-09-22 Dupont Teijin Films U.S. Limited Partnership Cellules photovoltaïques et films de polyester en tant que feuille arrière

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EP2774964B1 (fr) * 2011-11-04 2021-12-01 Daikin Industries, Ltd. Matériau de revêtement, film de revêtement, couche arrière pour module photovoltaïque et module photovoltaïque
JP6016528B2 (ja) * 2012-08-24 2016-10-26 東洋アルミニウム株式会社 太陽電池裏面保護シート
PL3009253T3 (pl) * 2013-06-11 2018-01-31 Toyo Boseki Folia termokurczliwa na bazie poliestru i opakowany produkt
CN103456843A (zh) * 2013-09-17 2013-12-18 连云港神舟新能源有限公司 一种背接触型晶体硅太阳能电池片组件的制作方法
BE1023776B1 (nl) * 2015-06-09 2017-07-20 P2I Ltd Verbeteringen met betrekking tot coatings
CN107903860B (zh) * 2017-09-12 2020-10-09 苏州固泰新材股份有限公司 一种太阳能电池背面保护膜用粘结剂及应用
CN109994566B (zh) * 2017-12-28 2021-07-27 宁波长阳科技股份有限公司 太阳能背板膜及其制备方法
CN108565305A (zh) * 2018-04-26 2018-09-21 徐州日托光伏科技有限公司 背接触太阳能电池的制造方法
JP7024853B2 (ja) * 2019-02-13 2022-02-24 東洋紡株式会社 積層ポリエステルフィルム
WO2021182150A1 (fr) * 2020-03-09 2021-09-16 東洋紡株式会社 Film polyester blanc à adhésion facile

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JP2013008883A (ja) * 2011-06-27 2013-01-10 Mitsubishi Plastics Inc 太陽電池裏面封止材用ポリエステルフィルム
JP2013021273A (ja) * 2011-07-14 2013-01-31 Fujifilm Corp 太陽電池用バックシート及び太陽電池モジュール
US20150068601A1 (en) * 2012-03-14 2015-03-12 Toyobo Co., Ltd. Sealing sheet for back surface of solar cell, and solar cell module
US10896987B2 (en) * 2012-03-14 2021-01-19 Toyobo Co., Ltd. Sealing sheet for back surface of solar cell, and solar cell module
JP2013253189A (ja) * 2012-06-08 2013-12-19 Toyobo Co Ltd 易接着フィルムおよびその製造方法
WO2016146982A1 (fr) * 2015-03-13 2016-09-22 Dupont Teijin Films U.S. Limited Partnership Cellules photovoltaïques et films de polyester en tant que feuille arrière
US11646385B2 (en) 2015-03-13 2023-05-09 Dupont Teijin Films U.S. Limited Partnership PV cells and backsheet polyester films

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TWI409171B (zh) 2013-09-21
KR101421360B1 (ko) 2014-07-24

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