WO2021065972A1 - 封止用シートの製造方法 - Google Patents
封止用シートの製造方法 Download PDFInfo
- Publication number
- WO2021065972A1 WO2021065972A1 PCT/JP2020/037059 JP2020037059W WO2021065972A1 WO 2021065972 A1 WO2021065972 A1 WO 2021065972A1 JP 2020037059 W JP2020037059 W JP 2020037059W WO 2021065972 A1 WO2021065972 A1 WO 2021065972A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- moisture
- layer
- resin composition
- proof
- film
- Prior art date
Links
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- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
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- 229920002367 Polyisobutene Polymers 0.000 description 1
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- 150000001925 cycloalkenes Chemical class 0.000 description 1
- 125000000113 cyclohexyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C1([H])[H] 0.000 description 1
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- 125000002147 dimethylamino group Chemical group [H]C([H])([H])N(*)C([H])([H])[H] 0.000 description 1
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- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
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- LLHKCFNBLRBOGN-UHFFFAOYSA-N propylene glycol methyl ether acetate Chemical compound COCC(C)OC(C)=O LLHKCFNBLRBOGN-UHFFFAOYSA-N 0.000 description 1
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- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- 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
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
-
- 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
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
-
- 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
-
- 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
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
-
- 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
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
-
- 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
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
-
- 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
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
- B32B37/1284—Application of adhesive
-
- 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
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/16—Drying; Softening; Cleaning
- B32B38/164—Drying
-
- 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
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- 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
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/02—Details
- H05B33/04—Sealing arrangements, e.g. against humidity
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/10—Apparatus or processes specially adapted to the manufacture of electroluminescent light sources
-
- 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
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
- B32B37/24—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer not being coherent before laminating, e.g. made up from granular material sprinkled onto a substrate
- B32B2037/243—Coating
-
- 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
- B32B2255/00—Coating on the layer surface
- B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
-
- 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
- B32B2255/00—Coating on the layer surface
- B32B2255/26—Polymeric coating
-
- 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
- B32B2457/00—Electrical equipment
- B32B2457/12—Photovoltaic modules
-
- 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
- B32B2581/00—Seals; Sealing equipment; Gaskets
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/84—Passivation; Containers; Encapsulations
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the present invention relates to a method for producing a sealing sheet useful for sealing an electronic device.
- the electronic devices are sealed using a sealing sheet having a resin composition layer. There is.
- Patent Document 1 proposes a sealing sheet having a first moisture-proof film, a resin composition layer, and a second moisture-proof film in order to suppress moisture absorption of the resin composition layer during storage.
- a sealing sheet having a laminated structure containing a first moisture-proof layer, a resin composition layer, and a second moisture-proof layer in this order, as described in Patent Document 1, can be sealed. It is possible to prevent the resin composition layer from absorbing moisture during storage and transportation of the sheet. However, even if moisture absorption of the resin composition layer during storage is prevented, if moisture is contained in the resin composition layer during the production of the sealing sheet, the internal moisture accelerates the deterioration of the electronic device. It may end up. Further, in the case of the sealing sheet having the laminated structure, even if the moisture of the resin composition layer is removed by the dryer, the first moisture-proof layer and the second moisture-proof layer move the moisture from the resin composition layer. Therefore, it is difficult to efficiently dry the resin composition layer.
- the present invention has been made by paying attention to the above circumstances, and an object of the present invention is to seal the resin composition layer so that it can be sufficiently dried and prevent moisture absorption of the resin composition layer during storage or the like. To manufacture sheets for use.
- a method comprising drying the resin composition layer in a state and providing the second moisture-proof layer while maintaining the resin composition layer in a low humidity atmosphere from the end of drying until the second moisture-proof layer is provided.
- a water vapor permeability of the first moisture-proof layer and the second moisture-proof layer are each independently method according to [1] is 0 ⁇ 5 (g / m 2 / 24hr).
- the present invention it is possible to produce a sealing sheet in which the resin composition layer is sufficiently dried and can prevent moisture absorption of the resin composition layer during storage or the like.
- the sealing sheet produced by the present invention has a laminated structure containing a first moisture-proof layer, a resin composition layer, and a second moisture-proof layer in this order. With such a laminated structure, it is possible to prevent the resin composition layer from absorbing moisture during storage or the like.
- the first moisture-proof layer and the second moisture-proof layer may be the same or different.
- the sealing sheet may include a layer different from the first moisture-proof layer, the resin composition layer and the second moisture-proof layer (for example, a mold release layer and an adhesive layer) between the layers. Different layers may be included as the outer layer.
- the first moisture-proof layer and the second moisture-proof layer water vapor transmission rate of are each independently preferably 5 (g / m 2 / 24hr ) or less , more preferably 2 (g / m 2 / 24hr ) or less, even more preferably 1.5 (g / m 2 / 24hr ) or less, more preferably 1 (g / m 2 / 24hr ), still more preferably 0 .1 (g / m 2 / 24hr ), particularly preferably not more than 0.05 (g / m 2 / 24hr ).
- the lower limit of the water vapor permeability of the first moisture-proof layer and the second moisture-proof layer is not particularly limited, and the water vapor permeability of the first moisture-proof layer and the second moisture-proof layer is independently set to, for example, 0 (g / g / g / g /. m is 2 / 24hr) or more.
- the WVTR of the first moisture-proof layer and the second moisture-proof layer is preferably a low value.
- a moisture-proof film having a relatively high WVTR and low cost is used for the moisture-proof layer removed before sealing, and a moisture-proof film having a relatively low WVTR is used for the moisture-proof layer not removed.
- a sex film may be used.
- the WVTR the moisture barrier is removed before sealing using the 0.1 (g / m 2 / 24hr ) or more moisture-proof film, is not removed WVTR the moisture barrier 0.1 (g / m 2/24 hr or) less than the moisture-proof film may be used. That is, either one of the moisture-proof layer of the first moisture-proof layer and the second moisture-proof layer of the sealing sheet of the present invention is relatively WVTR high (e.g., 0.1 (g / m 2 / 24hr) or ), one of the moisture barrier is relatively WVTR is low (e.g., 0.1 (g / m 2 / 24hr) may be less than) configuration.
- the water vapor permeability of the first moisture-proof layer and the second moisture-proof layer can be measured as follows. First, a test piece punched from the moisture-proof layer to 60 mm ⁇ is prepared. According to JIS Z 0208: 1976, 7.5 g of calcium chloride is weighed into an aluminum moisture permeable cup having a permeation area of 2.826 ⁇ 10 -3 m 2 (60 mm ⁇ ), and the test piece is attached to the moisture permeable cup. Add calcium chloride and measure the initial mass of the moisture-permeable cup with the test piece attached with a precision balance. Next, the moisture permeable cup was allowed to stand in a constant temperature test room at a temperature of 40 ° C.
- the moisture permeable mass of the moisture permeable cup to which the test piece was attached was weighed on a precision balance.
- the water vapor permeability of the first moisture-proof layer and the second moisture-proof layer may be measured by separating the moisture-proof layer from the sealing film, or the water vapor permeability of the moisture-proof film used for the moisture-proof layer may be measured. ..
- the structure of the first moisture-proof layer and the second moisture-proof layer may be a single-layer structure or a laminated structure.
- the structure of the first moisture-proof layer and the second moisture-proof layer is preferably a laminated structure having a barrier layer and a base material.
- the base material means a portion other than the barrier layer in the laminated structure.
- the moisture-proof layer may be formed of a moisture-proof film having a barrier layer and a base material.
- the structure of the base material constituting the moisture-proof layer or the moisture-proof film may be a single-layer structure or a laminated structure.
- the base material constituting the moisture-proof layer include polyolefins such as polyethylene and polypropylene (PP), polyesters such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), polycarbonate (PC), polyimide (PI) and cycloolefins.
- polyolefins such as polyethylene and polypropylene (PP)
- PET polyethylene terephthalate
- PEN polyethylene naphthalate
- PC polycarbonate
- PI polyimide
- cycloolefins examples thereof include plastic films such as polymers (COP) and polyvinyl chloride. Only one type of plastic film may be used, or two or more types may be used in combination.
- the base material is preferably a polyethylene terephthalate film, a cycloolefin polymer film, a polyethylene naphthalate film or a polycarbonate film, and more preferably a polyethylene terephthalate film or a cycloolefin polymer film.
- the thickness of the base material (when the base material is a laminated film, the total thickness thereof) is preferably 5 to 150 ⁇ m, more preferably 6 to 100 ⁇ m, and further preferably 12 to 75 ⁇ m.
- the moisture-proof layer or the barrier layer constituting the moisture-proof film examples include inorganic films such as metal foil (eg, aluminum foil), silica vapor-deposited film, silicon nitride film, and silicon oxide film.
- the barrier layer may be composed of a plurality of layers of a plurality of inorganic films (for example, a metal foil and a silica-deposited film). Further, the barrier layer may be composed of an organic substance and an inorganic substance, or may be a composite multilayer of an organic layer and an inorganic film.
- the thickness of the barrier layer is preferably 0.01 to 100 ⁇ m, more preferably 0.05 to 50 ⁇ m, and even more preferably 0.05 to 30 ⁇ m.
- a commercially available moisture-proof film may be used as the moisture-proof layer.
- Examples of commercially available products include “Clarista CI” manufactured by Kuraray Co., Ltd., “Tech Barrier HX”, “Tech Barrier LX” and “Tech Barrier L” manufactured by Mitsubishi Plastics, and “IB-PET-PXB” manufactured by Dai Nippon Printing Co., Ltd. Examples thereof include “GL, GX series” manufactured by Toppan Printing Co., Ltd., “PET Tsuki AL1N30” manufactured by Toyo Aluminum Co., Ltd., and “X-BARRIER” manufactured by Mitsubishi Plastics Co., Ltd.
- the sealing sheet contains a first moisture-proof layer, a first release layer, a resin composition layer, and a second moisture-proof layer in this order, and the first Has a laminated structure in which the release layer of the above and the resin composition layer are in contact with each other.
- the sealing sheet contains a first moisture-proof layer, a resin composition layer, a second release layer, and a second moisture-proof layer in this order. It has a laminated structure in which the fat composition layer and the second release layer are in contact with each other.
- the sealing sheet includes a first moisture-proof layer, a first release layer, a resin composition layer, a second release layer, and a second moisture-proof layer. , In this order, and has a laminated structure in which the first release layer and the resin composition layer are in contact with each other, and the resin composition layer and the second release layer are in contact with each other.
- Examples of the release agent forming the release layer include a silicone-based release agent, an alkyd-based release agent, a fluorine-based release agent, an olefin-based release agent, and the like.
- the release layer is preferably formed from a silicone-based release agent or an alkyd-based release agent.
- the thickness of the release layer is preferably 0.05 to 1 ⁇ m, more preferably 0.05 to 0.5 ⁇ m, and even more preferably 0.05 to 0.1 ⁇ m.
- the resin composition layer is not particularly limited, and a known resin composition can be used to form the resin composition layer.
- the resin composition layer preferably contains an olefin resin and / or an epoxy resin.
- the olefin resin and the epoxy resin are not particularly limited, and known ones (for example, those described in WO2018 / 181426A1) can be used.
- the amount of olefin resin is preferably 80% by mass or less per whole resin composition layer (that is, per whole non-volatile content of the resin composition), and is 75%. It is more preferably 0% by mass or less, further preferably 70% by mass or less, further preferably 60% by mass or less, further preferably 55% by mass or less, and particularly preferably 50% by mass or less.
- the amount of the olefin resin is preferably 1% by mass or more per whole resin composition layer (that is, the whole non-volatile content of the resin composition).
- the amount of epoxy resin is not particularly limited. When an epoxy resin is used, the amount thereof is preferably 10 to 80% by mass, more preferably 15 to 75% by mass, and 20 to 20 to the total amount of the resin composition layer (that is, the total amount of the non-volatile content of the resin composition). 70% by mass is more preferable.
- the resin composition layer preferably contains semi-firing hydrotalcite and / or calcined hydrotalcite, and more preferably contains semi-firing hydrotalcite.
- semi-calcined hydrotalcite and the calcined hydrotalcite only one type may be used, or two or more types may be used in combination.
- a sealing sheet having a resin composition layer containing semi-firing hydrotalcite and / or calcined hydrotalcite can exhibit high moisture blocking properties, but semi-firing hydrotalcite and calcined hydrotalcite absorb moisture. Since it has a property, the moisture absorption of the resin composition layer is increased.
- the resin composition layer can be sufficiently dried at the time of production, and the obtained sealing sheet is a resin composition layer at the time of storage or the like by the first and second moisture-proof layers. Moisture absorption can be prevented. Therefore, the present invention is suitable for producing a sealing sheet having a resin composition layer containing calcined hydrotalcite and / or calcined hydrotalcite.
- Hydrotalcite can be classified into uncalcined hydrotalcite, semi-calcined hydrotalcite, and calcined hydrotalcite.
- Unfired hydrotalcite is, for example, a metal hydroxide having a layered crystal structure typified by natural hydrotalcite (Mg 6 Al 2 (OH) 16 CO 3 ⁇ 4H 2 O), for example, It consists of a basic skeleton layer [Mg 1-X Al X (OH) 2 ] X + and an intermediate layer [(CO 3 ) X / 2 ⁇ mH 2 O] X ⁇ .
- the uncalcined hydrotalcite in the present invention is a concept including hydrotalcite-like compounds such as synthetic hydrotalcite. Examples of the hydrotalcite-like compound include those represented by the following formulas (I) and (II).
- M 2+ is Mg 2+, a divalent metal ion such as Zn 2+, M 3+ represents a trivalent metal ion such as Al 3+, Fe 3+, A n- is CO 3 2-, Cl -, NO 3 - represents a n-valent anion, such as a 0 ⁇ x ⁇ 1, a 0 ⁇ m ⁇ 1, n is a positive number).
- M 2+ is preferably Mg 2+
- M 3+ is preferably Al 3+
- a n- is preferably CO 3 2-.
- M 2+ is Mg 2+, a divalent metal ion such as Zn 2+, A n- is CO 3 2-, Cl -, NO 3 - represents a n-valent anion, such as, x is 2 or more Is a positive number, z is a positive number less than or equal to 2, m is a positive number, and n is a positive number.
- M 2+ is preferably Mg 2+
- Semi-calcined hydrotalcite refers to a metal hydroxide having a layered crystal structure in which the amount of interlayer water is reduced or eliminated, which is obtained by calcining uncalcined hydrotalcite.
- interlayer water refers to "H 2 O" described in the above-mentioned composition formulas of uncalcined natural hydrotalcite and hydrotalcite-like compounds, if it is described using a composition formula.
- calcined hydrotalcite refers to a metal oxide having an amorphous structure obtained by calcining uncalcined hydrotalcite or semi-calcined hydrotalcite, in which not only interlayer water but also hydroxyl groups are eliminated by condensation dehydration.
- Unfired hydrotalcite, semi-fired hydrotalcite and fired hydrotalcite can be distinguished by the saturated water absorption rate.
- the saturated water absorption rate of the semi-baked hydrotalcite is 1% by mass or more and less than 20% by mass.
- the saturated water absorption rate of uncalcined hydrotalcite is less than 1% by mass, and the saturated water absorption rate of calcined hydrotalcite is 20% by mass or more.
- the saturated water absorption rate of the semi-baked hydrotalcite is preferably 3% by mass or more and less than 20% by mass, and more preferably 5% by mass or more and less than 20% by mass.
- uncalcined hydrotalcite, semi-calcined hydrotalcite and calcined hydrotalcite can be distinguished by the thermogravimetric reduction rate measured by thermogravimetric analysis.
- the thermogravimetric reduction rate of the semi-baked hydrotalcite at 280 ° C. is less than 15% by mass, and the thermogravimetric reduction rate at 380 ° C. is 12% by mass or more.
- the thermogravimetric reduction rate of uncalcined hydrotalcite at 280 ° C. is 15% by mass or more
- the thermogravimetric reduction rate of calcined hydrotalcite at 380 ° C. is less than 12% by mass.
- thermogravimetric reduction rate 100 ⁇ (mass before heating-mass when a predetermined temperature is reached) / mass before heating (ii) Can be obtained at.
- uncalcined hydrotalcite, semi-calcined hydrotalcite and calcined hydrotalcite can be distinguished by the peak and relative intensity ratio measured by powder X-ray diffraction.
- Semi-baked hydrotalcite shows a peak in which 2 ⁇ is split into two in the vicinity of 8 to 18 ° by powder X-ray diffraction, or a peak with a shoulder due to the combination of the two peaks, and the peak or shoulder that appears on the low angle side.
- uncalcined hydrotalcite has only one peak near 8 to 18 °, or the relative intensity ratio of the diffraction intensity of the peak or shoulder appearing on the low angle side and the peak or shoulder appearing on the high angle side is in the above range. Be outside.
- the calcined hydrotalcite does not have a characteristic peak in the region of 8 ° to 18 °, but has a characteristic peak in the region of 43 °.
- the powder X-ray diffraction measurement is performed by a powder X-ray diffractometer (Empyrean manufactured by PANalytical), anti-cathode CuK ⁇ (1.5405 ⁇ ), voltage: 45 V, current: 40 mA, sampling width: 0.
- the measurement was performed under the conditions of 0260 °, scanning speed: 0.0657 ° / s, and measurement diffraction angle range (2 ⁇ ): 5.0131 to 79.9711 °.
- the peak search uses the peak search function of the software attached to the diffractometer, and "minimum significance: 0.50, minimum peak tip: 0.01 °, maximum peak tip: 1.00 °, peak base width: 2". It can be performed under the condition of "0.00 °, method: minimum value of second derivative".
- BET specific surface area of the semi-calcined hydrotalcites and calcined hydrotalcites are both preferably 1 ⁇ 250m 2 / g, more preferably 5 ⁇ 200m 2 / g. These BET specific surface areas can be calculated by adsorbing nitrogen gas on the sample surface using a specific surface area measuring device (Macsorb HM Model 1210, manufactured by Mountech) according to the BET method, and using the BET multipoint method.
- Macsorb HM Model 1210 manufactured by Mountech
- the particle size of the semi-calcined hydrotalcite and the calcined hydrotalcite is preferably 1 to 1,000 nm, more preferably 10 to 800 nm. These particle sizes are median diameters of the particle size distribution when the particle size distribution is prepared on a volume basis by laser diffraction / scattering type particle size distribution measurement (JIS Z8825).
- the semi-firing hydrotalcite and the semi-firing hydrotalcite those surface-treated with a surface treatment agent can be used.
- the surface treatment agent used for the surface treatment is not particularly limited, and known ones (for example, those described in WO2018 / 181426A1) can be used.
- the amount of semi-baked hydrotalcite there is no particular limitation on the amount of semi-baked hydrotalcite.
- the amount thereof is 3 to 80 mass per whole resin composition layer (that is, per total non-volatile content of the resin composition). % Is preferable, 5 to 75% by mass is more preferable, and 10 to 70% by mass is further preferable.
- Examples of the semi-baked hydrotalcite include “DHT-4C” (manufactured by Kyowa Chemical Industry Co., Ltd., particle size: 400 nm), “DHT-4A-2” (manufactured by Kyowa Chemical Industry Co., Ltd., particle size: 400 nm) and the like. ..
- examples of the calcined hydrotalcite include "KW-2200” (manufactured by Kyowa Chemical Industry Co., Ltd., particle size: 400 nm)
- examples of the uncalcined hydrotalcite include “DHT-4A” (Kyowa Chemical Industry Co., Ltd.). Manufactured by the company, particle size: 400 nm) and the like.
- the resin composition layer may contain other components different from the above-mentioned olefin resin, epoxy resin and semi-calcined hydrotalcite.
- the other components are not limited, and known components of the resin composition for sealing (for example, those described in WO2018 / 181426A1) can be used.
- the thickness of the resin composition layer is preferably 3 to 75 ⁇ m, more preferably 3 to 50 ⁇ m, and even more preferably 5 to 50 ⁇ m.
- a sealing sheet having a laminated structure containing a first moisture-proof layer, a resin composition layer, and a second moisture-proof layer in this order is, for example, coated with a resin composition varnish on the first moisture-proof layer. It can be produced by drying to form a resin composition layer and attaching a second moisture-proof layer to the obtained resin composition layer. An adhesive may be used for bonding the second moisture-proof layer.
- the first moisture-proof layer, the first release layer, the resin composition layer, the second release layer, and the second moisture-proof layer are contained in this order, and the first release layer and the resin are included.
- the sealing sheet having a laminated structure in which the composition layer is in contact and the resin composition layer and the second release layer are in contact is, for example, a first release layer / first moisture-proof layer.
- a resin composition varnish is applied to and dried on the first release layer of the laminate having a structure to form a resin composition layer, and a second release layer / second is applied to the obtained resin composition layer.
- the laminate having the structure of the moisture-proof layer can be produced by laminating the resin composition layer and the second release layer so as to be in contact with each other.
- the first moisture-proof layer, the first release layer, the resin composition layer, and the second moisture-proof layer are contained in this order, and the first release layer and the resin composition layer come into contact with each other.
- a sealing sheet having a laminated structure in which the mold is in contact with the second release layer can also be manufactured in the same manner.
- the laminate having the structure of the release layer / moisture-proof layer a commercially available product (for example, a moisture-proof film with a release layer) may be used. Further, the release agent may be applied to the moisture-proof layer and dried to produce a laminate having a structure of the release layer / moisture-proof layer.
- the resin composition varnish can be produced by mixing the components of the resin composition and the organic solvent using a kneading roller, a rotary mixer, or the like.
- the non-volatile content of the resin composition varnish is preferably 20 to 80% by mass, more preferably 30 to 70% by mass.
- organic solvent examples include ketones such as acetone, methyl ethyl ketone (MEK) and cyclohexanone; acetic acid esters such as ethyl acetate, butyl acetate, cellosolve acetate, propylene glycol monomethyl ether acetate and carbitol acetate; cellosolve, butyl carbitol and the like.
- ketones such as acetone, methyl ethyl ketone (MEK) and cyclohexanone
- acetic acid esters such as ethyl acetate, butyl acetate, cellosolve acetate, propylene glycol monomethyl ether acetate and carbitol acetate
- cellosolve butyl carbitol and the like.
- Carbitols aromatic hydrocarbons such as toluene and xylene
- aromatic mixed solvent products examples include “Swazole” (manufactured by Maruzen Petrochemical Co., Ltd.) and “Ipsol” (manufactured by Idemitsu Kosan Co., Ltd.).
- the organic solvent only one kind may be used, or two or more kinds may be used in combination.
- the resin composition layer is dried without the second moisture-proof layer, and the resin composition layer is maintained in a low humidity atmosphere from the end of drying until the second moisture-proof layer is provided. It is characterized in that the moisture-proof layer of 2 is provided. Due to this feature, it is possible to prevent moisture absorption of the resin composition layer during production and to produce a sealing sheet containing a sufficiently dried resin composition layer.
- the resin composition layer may be dried at the same time as the resin composition layer is formed by drying the resin composition varnish. That is, the resin composition layer is formed and dried by drying the resin composition varnish in one step, and the resin composition layer is maintained in a low humidity atmosphere from the end of drying until the second moisture-proof layer is provided. However, a second moisture-proof layer may be provided.
- the drying of the resin composition layer may be performed separately from the formation of the resin composition layer by drying the resin composition varnish. That is, in addition to the step of forming the resin composition layer by drying the resin composition varnish, the step of drying the formed resin composition layer is separately performed, and from the end of drying to the provision of the second moisture-proof layer. In the meantime, the second moisture-proof layer may be provided while keeping the resin composition layer in a low humidity atmosphere. If the step of forming the resin composition layer and the step of drying the resin composition layer are not continuously performed, a cover film is placed on the resin composition layer in order to prevent dust and the like from adhering to the resin composition layer. The cover film may be peeled off before the drying step, or if the cover film has sufficient moisture permeability (corresponding to the moisture permeable layer described later), it may be dried as it is.
- An aspect of drying the composition layer is included.
- the above aspect (1) is preferable from the viewpoint of drying efficiency, but the above aspect (2) is preferable from the viewpoint of preventing dust and the like from adhering to the resin composition layer.
- the exposed surface of the resin composition layer or the surface opposite to the surface covered with the moisture permeable layer may be exposed and may be covered with another layer (for example, a first moisture-proof layer). May be good.
- the film and sheet used as the moisture permeable layer examples include a porous polyolefin film and a low crystalline polyolefin film.
- the above-mentioned plastic film may be used as long as it has a certain degree of moisture permeability, and commercially available films and sheets such as a breathable film and a moisture permeable sheet may be used.
- Water vapor permeability of the moisture permeable layer is preferably 10 (g / m 2 / 24hr ), more preferably 30 (g / m 2 / 24hr ), more preferably 50 (g / m 2 / 24hr ) or more, particularly preferably is 100 (g / m 2 / 24hr ) or more, most preferably 150 (g / m 2 / 24hr ) or more.
- the upper limit is not particularly limited, for example, 20,000 (g / m 2 / 24hr ).
- the thickness of the moisture permeable layer is preferably 1 to 200 ⁇ m, more preferably 1 to 75 ⁇ m, and even more preferably 1 to 25 ⁇ m.
- the resin composition layer may be dried by, for example, heat drying or vacuum drying, or a combination of these may be used. Further, the resin composition layer may be dried in an air atmosphere or in an inert gas atmosphere.
- the resin composition layer it is preferable to dry the resin composition layer by heating, and the resin composition layer includes the first moisture-proof layer and the resin composition layer, and is opposite to the side where the first moisture-proof layer is present. It is more preferable to dry the resin composition layer by heating a sheet having a laminated structure in which the surface of the resin composition is exposed. Drying conditions such as drying temperature, drying time, and degree of vacuum differ depending on the water content contained in the resin composition layer, the desired water content, the type of dryer, and the like.
- the drying temperature is generally set appropriately in the range of 80 to 220 ° C.
- the temperature is preferably 80 to 150 ° C.
- the temperature is preferably 100 to 180 ° C.
- the drying time is preferably 1 to 180 minutes, more preferably 3 to 150 minutes, and even more preferably 5 to 120 minutes.
- the drying temperature means the temperature inside the dryer when the drying is performed by the dryer, and the temperature of the heated portion of the heater when the drying is performed by the heater (for example, a hot plate).
- the drying of the resin composition layer may be performed separately from the formation of the resin composition layer by drying the resin composition varnish, or may be performed at the same time as the formation of the resin composition layer by drying the resin composition varnish.
- the drying temperature and drying time are the same as in the above range.
- the degree of vacuum in the case of vacuum drying is not particularly limited as long as the pressure is lower than the atmospheric pressure, but is preferably 10 to 100,000 Pa, more preferably 10 to 10,000 Pa, and further preferably 10 to 1,000 Pa. ..
- the more preferable preferably 1500 ppm or less, more preferably 1000 ppm or less, still more preferably 500 ppm or less, still more preferably 200 ppm or less. , More preferably 100 ppm or less.
- the resin composition layer can be dried by a known dryer.
- the dryer may be a batch type dryer or a continuous type dryer.
- the dryer may be one in which a high-temperature object is brought into contact with the object to be dried, or one in which the object to be dried is irradiated with light rays.
- Examples of the former include a hot air circulation furnace, a heating transfer roll, and the like.
- Examples of the latter include a near-infrared irradiation furnace.
- a heater for example, a hot plate
- a container for example, a glove box
- the end of drying in the present invention is the end of the drying operation or It means when the second moisture-proof layer is provided.
- the end of the drying operation means the time when the object to be dried is taken out of the continuous dryer.
- the end of the drying operation means the end of heating.
- the resin composition In the mode of holding the resin composition layer in a low humidity atmosphere from the end of drying to the provision of the second moisture-proof layer, the resin composition is "between the end of drying and the provision of the second moisture-proof layer". As long as the material layer is held in a low humidity atmosphere, the resin composition layer is held in a low humidity atmosphere other than this period (for example, during drying), and other than this period, the resin composition layer is kept in a low humidity atmosphere. Both non-retaining aspects are included.
- the embodiment in which the second moisture-proof layer is provided while keeping the resin composition layer in a low humidity atmosphere from the end of drying to the provision of the second moisture-proof layer includes the following aspects: (I) An embodiment in which the drying operation is completed after holding the resin composition layer in a low humidity atmosphere and a second moisture-proof layer is provided while holding the resin composition layer in a low humidity atmosphere, and (ii) a resin composition. An embodiment in which a second moisture-proof layer is provided while continuing drying in a low-humidity atmosphere without completing the drying operation even after the material layer is held in a low-humidity atmosphere.
- the second moisture-proof layer is provided while maintaining the resin composition layer in a low humidity atmosphere
- a mode in which a film containing a second moisture-proof layer or a second moisture-proof layer is attached to an exposed surface of the resin composition layer while maintaining the resin composition layer in a low humidity atmosphere for example, (A) A mode in which a film containing a second moisture-proof layer or a second moisture-proof layer is attached to an exposed surface of the resin composition layer while maintaining the resin composition layer in a low humidity atmosphere. (B) A mode in which a film containing a second moisture-proof layer or a second moisture-proof layer is attached to a moisture-permeable layer on the resin composition layer while maintaining the resin composition layer in a low humidity atmosphere.
- a precursor layer capable of forming a second moisture-proof layer is formed on the exposed surface of the resin composition layer by coating or the like, and a treatment such as heating is performed.
- a precursor layer capable of forming a second moisture-proof layer is formed on the moisture-permeable layer on the resin composition layer by coating or the like, and a treatment such as heating is performed.
- the atmosphere in the dryer for drying the resin composition layer or the above-mentioned container for example, a glove box
- the atmosphere in the dryer for drying the resin composition layer or the above-mentioned container is maintained in a low humidity atmosphere. It can be carried out by laminating the moisture-proof layer of the above, or by applying and drying the moisture-proof resin composition.
- a dryer, a connection space having a transport mechanism, and a vapor deposition apparatus are connected in this order, and all the spaces are under reduced pressure (preferably, for example, 10-7 (Torr)).
- the resin composition can be dried by a dryer, then the resin composition is transferred to a vapor deposition apparatus by a transport mechanism, and a barrier layer is formed by the vapor deposition apparatus. ..
- the water concentration (volume fraction) in a low humidity atmosphere is preferably as low as possible (ideally 0 ppm), preferably 3300 ppm or less, more preferably 2,000 ppm or less, still more preferably 1000 ppm or less, still more preferably.
- a sheet having a laminated structure including a first moisture-proof layer and a resin composition layer and having an exposed surface of the resin composition layer on the side opposite to the side where the first moisture-proof layer is present is heated.
- the resin composition layer is dried by the above method, and the resin composition is maintained in a low humidity atmosphere from the end of drying until the film containing the second moisture-proof layer or the second moisture-proof layer is attached. It is particularly preferable to attach a film containing a second moisture-proof layer or a second moisture-proof layer to the exposed surface of the material layer.
- the sealing sheet obtained by the present invention is useful for sealing electronic devices (for example, organic EL devices, solar cells, etc.).
- PET film with release layer "E7004" manufactured by Toyobo Co., Ltd.
- PET film with release layer silicone release layer
- release layer silicone release layer
- substrate (PET film) thickness 38 ⁇ m
- water vapor permeability 34g / m 2 / 24hr
- Moisture-proof film 1 "Tech Barrier HX” manufactured by Mitsubishi Resin Co., Ltd.
- PET film with barrier layer, barrier layer silica vapor deposition film
- base material (PET film) thickness 12.5 ⁇ m
- water vapor permeability 0.5 g / m 2 / 24hr
- Moisture-proof film 2 "Bereal UD” manufactured by Reiko Co., Ltd.
- PET film with barrier layer, barrier layer silica-deposited film
- substrate (PET film) thickness 50 ⁇ m
- water vapor permeability 0.01 g / m 2 / 24hr
- Production Example 1 Manufacture of a moisture-proof film with a release layer A PET film surface on the opposite side of the release layer of a PET film with a release layer and a base material (PET film) surface on the opposite side of the barrier layer of the moisture-proof film 1 are formed.
- a moisture-proof film with a release layer having a laminated structure with a PET film with a release layer (release layer / PET film) / adhesive layer / moisture-proof film 1 (PET film / barrier layer) was produced. (Thickness of the entire moisture-proof film with a release layer: 55 ⁇ m).
- the moisture-proof film 1 corresponds to the moisture-proof layer.
- Production Example 2 Production of resin composition varnish In 130 parts by mass of a 60 mass% swazole solution of a cyclohexane ring-containing saturated hydrocarbon resin (“Arcon P125” manufactured by Arakawa Chemical Co., Ltd.), maleic anhydride-modified liquid polyisobutylene (Toho Chemical Industry Co., Ltd.) 35 parts by mass of "HV-300M” manufactured by JXTG Energy Co., Ltd., 60 parts by mass of polybutene ("HV-1900" manufactured by JXTG Energy Co., Ltd.), and 100 parts by mass of semi-baked hydrotalcite (“DHT-4C” manufactured by Kyowa Chemical Industry Co., Ltd.). The mixture was dispersed with this roll to obtain a mixture.
- a 60 mass% swazole solution of a cyclohexane ring-containing saturated hydrocarbon resin (“Arcon P125” manufactured by Arakawa Chemical Co., Ltd.)
- maleic anhydride-modified liquid polyisobutylene
- Production Example 3 Production of undried sealing sheet
- the resin composition varnish obtained in Production Example 2 is uniformly applied to the release layer surface of the moisture-proof film with release layer obtained in Production Example 1 with a die coater. And heated at 130 ° C. for 60 minutes to obtain a sealing sheet having a resin composition layer having a thickness of 20 ⁇ m (residual solvent amount in the resin composition layer: about 1% by mass).
- the sealing sheet is bonded so that the resin composition layer of the obtained sealing sheet and the release layer surface of the moisture-proof film with the release layer obtained in Production Example 1 are in contact with each other.
- a roll-shaped sealing sheet was cut into 40 mm ⁇ 80 mm to produce an undried sealing sheet.
- the undried sealing sheet is a temporary moisture-proof layer (moisture-proof film 1) / adhesive layer / PET film / release layer / resin composition layer / release layer / PET film / adhesive layer / first moisture-proof layer. It had a laminated structure with a layer (moisture-proof film 1).
- Production Example 4 Production of Moisture-Proof Film with Adhesive Layer
- Adhesive having a laminated structure of moisture-proof film 2 (base material / barrier layer) / adhesive layer by adhering a polyolefin-based adhesive film (thickness 10 ⁇ m) to the barrier layer surface of the moisture-proof film 2.
- a layered moisture-proof film was manufactured.
- Example 1 A hot plate (150 ° C.) was prepared in a nitrogen glove box having a water concentration (volume fraction) of less than 0.1 ppm (detection limit of 0.1 ppm of the device). It has a laminated structure of a moisture-proof film with a release layer (that is, a temporary moisture-proof layer (moisture-proof film 1) / adhesive layer / PET film / release layer from the undried sealing sheet obtained in Production Example 3). A sheet from which the film) has been removed (that is, a sheet having a laminated structure with a resin composition layer / release layer / PET film / adhesive layer / first moisture-proof layer (moisture-proof film 1)) is placed on a hot plate with a resin.
- a temporary moisture-proof layer moisture-proof film 1
- a sheet from which the film) has been removed that is, a sheet having a laminated structure with a resin composition layer / release layer / PET film / adhesive layer / first moisture-proof layer (moisture-proof film
- the resin composition layer was dried by heating with the composition layer facing up for 30 minutes (the obtained sheet is hereinafter abbreviated as "dried unfinished sheet”). After 10 minutes have passed from the stop of heating, the moisture-proof film with a release layer obtained in Production Example 1 (that is, the second moisture-proof layer (moisture-proof layer)) is applied to the resin composition layer of the dried unfinished sheet in the glove box as it is.
- Film 1) / adhesive layer / PET film / film having a laminated structure with a release layer is pressed by a rubber roller heated to 60 ° C. at a pressure of 0.3 MPa or more to bond them together for sealing. The sheet was manufactured.
- the obtained sealing sheet is a second moisture-proof layer (moisture-proof film 1) / adhesive layer / PET film / release layer / resin composition layer / release layer / PET film / adhesive layer / first. It had a laminated structure with a moisture-proof layer (moisture-proof film 1).
- Example 2 It has a laminated structure of a moisture-proof film with a release layer (that is, a temporary moisture-proof layer (moisture-proof film 1) / adhesive layer / PET film / release layer from the undried sealing sheet obtained in Production Example 3).
- a sheet from which the film) has been removed that is, a sheet having a laminated structure with a resin composition layer / release layer / PET film / adhesive layer / first moisture-proof layer (moisture-proof film 1)
- the moisture-proof film with a release layer obtained in Production Example 1 (that is, a film having a laminated structure of a second moisture-proof layer (moisture-proof film 1) / adhesive layer / PET film / release layer) and drying
- the sheet having the resin composition layer is in a box having a relative humidity of 6% RH (moisture concentration (body integration rate): 1,800 ppm) at 1013 hPa and 25 ° C., and the temperature is adjusted to 30 ° C. It is conveyed to a roll laminator, and the moisture-proof film with a release layer obtained in Production Example 1 above is bonded to the resin composition layer by pressing it with a rubber roller heated to 60 ° C. at a pressure of 0.3 MPa or more.
- the obtained sealing sheet is a second moisture-proof layer (moisture-proof film 1) / adhesive layer / PET film / release layer / resin composition layer / release layer / PET film / adhesive layer / first. It had a laminated structure with a moisture-proof layer (moisture-proof film 1).
- Example 3 A 150 ° C. hot plate was prepared in a nitrogen glove box having a water concentration (volume fraction) of less than 0.1 ppm (detection limit of 0.1 ppm of the device). It has a laminated structure of a moisture-proof film with a release layer (that is, a temporary moisture-proof layer (moisture-proof film 1) / adhesive layer / PET film / release layer from the undried sealing sheet obtained in Production Example 3).
- a moisture-proof film with a release layer that is, a temporary moisture-proof layer (moisture-proof film 1) / adhesive layer / PET film / release layer from the undried sealing sheet obtained in Production Example 3).
- the release layer on the resin composition surface PET film water vapor transmission rate: 34g / m 2 / 24hr, pressure above 0.3MPa by a rubber roller for use
- a laminated structure containing a PET film with a release layer, a resin composition layer, and a moisture-proof film with a release layer in this order was produced. More specifically, the obtained sheet has a laminated structure with a PET film / release layer / resin composition layer / release layer / PET film / adhesive layer / first moisture-proof layer (moisture-proof film 1). Was there.
- the resin composition layer was dried by heating this sheet with a PET film with a release layer (that is, a film having a laminated structure with a PET film / release layer) facing up for 30 minutes. After 10 minutes have passed from the stop of heating, the sheet having a laminated structure containing the PET film with a release layer, the dried resin composition layer, and the moisture-proof film with a release layer in this order in the glove box as it is.
- the adhesive layer side of the moisture-proof film with an adhesive layer produced in Production Example 4 (that is, the second moisture-proof layer (moisture-proof film 2) / the film having a laminated structure of the adhesive layer) is set at 60 ° C.
- the moisture-proof film with an adhesive layer, the PET film with a release layer, the resin composition layer, and the moisture-proof film with a release layer are bonded by pressing with a rubber roller heated to the above at a pressure of 0.3 MPa or more.
- a sealing sheet having a laminated structure containing these in this order was produced. More specifically, the obtained sealing sheet is a second moisture-proof layer (moisture-proof film 2) / adhesive layer / PET film / release layer / resin composition layer / release layer / PET film / adhesive layer / It had a laminated structure with the first moisture-proof layer (moisture-proof film 1).
- Comparative Example 1 The dried unfinished sheet obtained in the same manner as in Example 1 was subjected to the air at 25 ° C. and 40% RH (moisture concentration (volume fraction): 12,500 ppm) with the resin composition exposed. The film was left in an atmosphere for 10 minutes, and then the moisture-proof film with a release layer obtained in Production Example 1 was applied to the resin composition layer of the sheet at a pressure of 0.3 MPa or more by a rubber roller heated to 60 ° C. A sealing sheet was manufactured by pressing them together. The obtained sealing sheet is a second moisture-proof layer (moisture-proof film 1) / adhesive layer / PET film / release layer / resin composition layer / release layer / PET film / adhesive layer / first. It had a laminated structure with a moisture-proof layer (moisture-proof film 1).
- RH moisture concentration (volume fraction): 12,500 ppm
- Comparative Example 2 A sealing sheet was produced in the same manner as in Example 1 except that a PET film with a release layer was used instead of the moisture-proof film with a release layer obtained in Production Example 1.
- the obtained sealing sheet is laminated with a non-moisture-proof layer (PET film) / release layer / resin composition layer / release layer / PET film / adhesive layer / first moisture-proof layer (moisture-proof film 1). It had a structure.
- Comparative Example 3 This temporary moisture-proof layer is formed without removing the "temporary moisture-proof layer (moisture-proof film 1) / adhesive layer / PET film / release layer" portion from the undried sealing sheet obtained in Production Example 3.
- the first moisture-proof layer is used as a second moisture-proof layer and is used on a hot plate (150 ° C.) under the same drying conditions as in Example 1 (in the nitrogen glove box (moisture concentration (volume fraction): less than 0.1 ppm)). It was dried by heating and drying for 30 minutes on the hot plate side) to produce a sealing sheet.
- the obtained sealing sheet is a second moisture-proof layer (moisture-proof film 1) / adhesive layer / PET film / release layer / resin composition layer / release layer / PET film / adhesive layer / first. It had a laminated structure with a moisture-proof layer (moisture-proof film 1).
- the resin composition layer was taken out from the sealing sheet in a nitrogen glove box having a water concentration (volume fraction) of less than 0.1 ppm (detection limit of 0.1 ppm of the device). This resin composition layer was folded to an appropriate size to prepare a sample, and the weight thereof was measured. Next, the sample was put into the vaporization cylinder of the Karl Fischer Moisture Measuring Device (“Major Moisture Measuring Device CA-200” manufactured by Mitsubishi Chemical Analytech Co., Ltd.) and heated to 130 ° C. while preventing contact with the space containing water.
- Karl Fischer Moisture Measuring Device (“Major Moisture Measuring Device CA-200” manufactured by Mitsubishi Chemical Analytech Co., Ltd.)
- the water concentration (mass fraction) of the sample is based on the total vaporized water content calculated from immediately after the start of heating until the water content detected per second becomes less than 0.15 ⁇ g / sec and the weight of the sample. ppm) was calculated. A water concentration (mass fraction) of 500 ppm or less was evaluated as ⁇ , and a water concentration (mass fraction) of more than 500 ppm was evaluated as ⁇ .
- the sealing sheets obtained in Examples 1 to 3 had sufficiently low water concentration (mass fraction) immediately after production and water concentration (mass fraction) after standing.
- Comparative Example 1 in which the film containing the second moisture-proof layer was bonded in an atmosphere having a high water concentration, the water concentration (mass fraction) immediately after production was high.
- Comparative Example 2 in which a non-moisture-proof layer was used instead of the second moisture-proof layer, the water concentration (mass fraction) after standing was high.
- Comparative Example 3 in which the product was dried with the temporary moisture-proof layer attached, the water concentration (mass fraction) immediately after production was high.
- Comparative Example 3 the moisture concentration immediately after production was high when the resin composition layer was released from the moisture-proof film with a release layer (that is, the second moisture-proof layer (moisture-proof film 1) / adhesive layer /. It is considered that the moisture was transferred to the PET film / the film having a laminated structure with the release layer), and the moisture was transferred to the resin composition layer again during standing.
- the sealing sheet obtained by the present invention is useful for sealing electronic devices (for example, organic EL devices, sensor devices, solar cells, etc.).
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Abstract
Description
[1] 第1の防湿層と、樹脂組成物層と、第2の防湿層とを、これらの順に含む積層構造を有する封止用シートの製造方法であって、第2の防湿層が無い状態で樹脂組成物層を乾燥し、乾燥終了時から第2の防湿層を設けるまでの間、樹脂組成物層を低湿度雰囲気下に保持しながら第2の防湿層を設けることを含む方法。
[2] 第1の防湿層および第2の防湿層の水蒸気透過度が、それぞれ独立に、0~5(g/m2/24hr)である前記[1]に記載の方法。
[3] 低湿度雰囲気の水分濃度(体積分率)が、3,300ppm以下である前記[1]または[2]に記載の方法。
[4] 加熱によって樹脂組成物層を乾燥する前記[1]~[3]のいずれか一つに記載の方法。
[5] 第1の防湿層と樹脂組成物層とを含み、第1の防湿層が存在する側とは反対側の樹脂組成物層の面が露出した積層構造を有するシートを加熱することによって、樹脂組成物層を乾燥する前記[4]に記載の方法。
[6] 乾燥温度が、80~220℃である前記[4]または[5]に記載の方法。
[7] 樹脂組成物層が、半焼成ハイドロタルサイトおよび/または焼成ハイドロタルサイトを含む前記[1]~[6]のいずれか一つに記載の方法。
[8] 封止用シートが、電子デバイスの封止に用いられるシートである前記[1]~[7]のいずれか一つに記載の方法。
[9] 電子デバイスが、有機ELデバイスまたは太陽電池である前記[8]に記載の方法。
(I)
(式中、M2+はMg2+、Zn2+などの2価の金属イオンを表し、M3+はAl3+、Fe3+などの3価の金属イオンを表し、An-はCO3 2-、Cl-、NO3 -などのn価のアニオンを表し、0<x<1であり、0≦m<1であり、nは正の数である。)
式(I)中、M2+は、好ましくはMg2+であり、M3+は、好ましくはAl3+であり、An-は、好ましくはCO3 2-である。
(式中、M2+はMg2+、Zn2+などの2価の金属イオンを表し、An-はCO3 2-、Cl-、NO3 -などのn価のアニオンを表し、xは2以上の正の数であり、zは2以下の正の数であり、mは正の数であり、nは正の数である。)
式(II)中、M2+は、好ましくはMg2+であり、An-は、好ましくはCO3 2-である。
飽和吸水率(質量%)
=100×(吸湿後の質量-初期質量)/初期質量 (i)
で求めることができる。
熱重量減少率(質量%)
=100×(加熱前の質量-所定温度に達した時の質量)/加熱前の質量 (ii)
で求めることができる。
(1)樹脂組成物層の少なくとも一方の面が露出された状態で樹脂組成物層を乾燥する態様、および
(2)樹脂組成物層の少なくとも一方の面を水分透過層で覆った状態で樹脂組成物層を乾燥する態様
が含まれる。乾燥効率の観点から、上記(1)の態様が好ましいが、樹脂組成物層にゴミ等が付着するのを抑止する観点からは上記(2)の態様が好ましい。樹脂組成物層の露出された面または水分透過層で覆われた面の反対側の面は、露出されていてもよく、また他の層(例えば、第1の防湿層)で覆われていてもよい。
(i)樹脂組成物層を低湿度雰囲気下に保持した後に乾燥操作を終了し、樹脂組成物層を低湿度雰囲気下に保持しながら第2の防湿層を設ける態様、および
(ii)樹脂組成物層を低湿度雰囲気下に保持した後でも乾燥操作を終了せずに、低湿度雰囲気下での乾燥を続けながら、第2の防湿層を設ける態様。
なお、上記(ii)の態様では、「乾燥終了時」と「第2の防湿層を設けた時」とは同じである。そのため、上記(ii)の態様では、「乾燥終了時から第2の防湿層を設けるまでの間」=「乾燥終了時」=「第2の防湿層を設けた時」である。
(a)樹脂組成物層を低湿度雰囲気下に保持しながら、樹脂組成物層の露出された面に、第2の防湿層を含むフィルムまたは第2の防湿層を貼り合わせる態様、
(b)樹脂組成物層を低湿度雰囲気下に保持しながら、樹脂組成物層上の水分透過層に、第2の防湿層を含むフィルムまたは第2の防湿層を貼り合わせる態様、
(c)樹脂組成物層を低湿度雰囲気下に保持しながら、樹脂組成物層の露出された面に第2の防湿層を形成し得る前駆物層を塗布等により形成し、加熱等の処理を加えて第2の防湿層を形成する態様、
(d)樹脂組成物層を低湿度雰囲気下に保持しながら、樹脂組成物層上の水分透過層に第2の防湿層を形成し得る前駆物層を塗布等により形成し、加熱等の処理を加えて第2の防湿層を形成する態様、
(e)樹脂組成物層を低湿度雰囲気下に保持しながら、樹脂組成物層の露出された面にバリア層を形成する無機物を蒸着して第2の防湿層を形成する態様、
(f)樹脂組成物層を低湿度雰囲気下に保持しながら、樹脂組成物層上の水分透過層にバリア層を形成する無機物を蒸着して第2の防湿層を形成する態様
が挙げられる。これらの中で、操作の簡便さから上記(a)の態様が好ましい。
実施例および比較例で使用したフィルムを以下に記載する。
離型層付きPETフィルム:東洋紡社製「E7004」(離型層付のポリエチレンテレフタレート(PET)フィルム、離型層:シリコーン離型層、基材(PETフィルム)の厚さ:38μm、水蒸気透過度:34g/m2/24hr)
防湿フィルム1:三菱樹脂社製「テックバリアHX」(バリア層付のPETフィルム、バリア層:シリカ蒸着膜、基材(PETフィルム)の厚さ:12.5μm、水蒸気透過度:0.5g/m2/24hr)
防湿フィルム2:麗光社製「ベレアル UD」(バリア層付のPETフィルム、バリア層:シリカ蒸着膜、基材(PETフィルム)の厚さ:50μm、水蒸気透過度:0.01g/m2/24hr)
離型層付きPETフィルムの離型層の反対側のPETフィルム面と、防湿フィルム1のバリア層の反対側の基材(PETフィルム)面とを接着剤で貼り合せ、離型層付きPETフィルム(離型層/PETフィルム)/接着剤層/防湿フィルム1(PETフィルム/バリア層)との積層構造を有する離型層付き防湿フィルムを製造した(離型層付き防湿フィルム全体の厚さ:55μm)。なお、離型層付き防湿フィルムにおいて、防湿フィルム1が防湿層に対応する。
シクロヘキサン環含有飽和炭化水素樹脂(荒川化学社製「アルコンP125」)の60質量%スワゾール溶液130質量部に、無水マレイン酸変性液状ポリイソブチレン(東邦化学工業社製「HV-300M」)35質量部、ポリブテン(JXTGエネルギー社製「HV-1900」)60質量部、および半焼成ハイドロタルサイト(協和化学工業社製「DHT-4C」)100質量部を3本ロールで分散させて、混合物を得た。得られた混合物に、グリシジルメタクリレート変性ポリプロピレン-ポリブテン共重合体の20質量%スワゾール溶液(星光PMC社製「T-YP341」)200質量部、硬化促進剤(2,4,6-トリス(ジメチルアミノメチル)フェノール)0.5質量部およびトルエン16質量部を配合し、得られた混合物を高速回転ミキサーで均一に分散して、オレフィン系樹脂組成物ワニスを得た。
製造例2で得られた樹脂組成物ワニスを、製造例1で得られた離型層付き防湿フィルムの離型層面に、ダイコーターにて均一に塗布し、130℃で60分間加熱することにより、厚さ20μmの樹脂組成物層を有する封止用シートを得た(樹脂組成物層中の残留溶媒量:約1質量%)。次いで、得られた封止用シートの樹脂組成物層と、製造例1で得られた離型層付き防湿フィルムの離型層面とが接触するように、これらを貼り合わせながら、封止用シートをロール状に巻き取った。ロール状の封止用シートを40mm×80mmに切断し、未乾燥の封止用シートを製造した。未乾燥の封止用シートは、一時的防湿層(防湿フィルム1)/接着剤層/PETフィルム/離型層/樹脂組成物層/離型層/PETフィルム/接着剤層/第1の防湿層(防湿フィルム1)との積層構造を有していた。
防湿フィルム2のバリア層面にポリオレフィン系粘着フィルム(厚さ10μm)を接着させ、防湿フィルム2(基材/バリア層)/粘着層の積層構造を有する粘着層付き防湿フィルムを製造した。
水分濃度(体積分率)を0.1ppm未満(装置の検出限界0.1ppm)とした窒素グローブボックス内にホットプレート(150℃)を用意した。製造例3で得られた未乾燥の封止用シートから離型層付き防湿フィルム(即ち、一時的防湿層(防湿フィルム1)/接着剤層/PETフィルム/離型層との積層構造を有するフィルム)を除去したシート(即ち、樹脂組成物層/離型層/PETフィルム/接着剤層/第1の防湿層(防湿フィルム1)との積層構造を有するシート)を、ホットプレート上で樹脂組成物層を上にして30分間加熱することによって、樹脂組成物層を乾燥した(得られたシートを以下「乾燥した未完成シート」と略称する)。加熱停止から10分間経過した後、そのままグローブボックス内で、乾燥した未完成シートの樹脂組成物層に、製造例1で得られた離型層付き防湿フィルム(即ち、第2の防湿層(防湿フィルム1)/接着剤層/PETフィルム/離型層との積層構造を有するフィルム)を、60℃に加温したゴムローラーにより0.3MPa以上の圧力で押し付けることで貼り合わせて、封止用シートを製造した。得られた封止用シートは、第2の防湿層(防湿フィルム1)/接着剤層/PETフィルム/離型層/樹脂組成物層/離型層/PETフィルム/接着剤層/第1の防湿層(防湿フィルム1)との積層構造を有していた。
製造例3で得られた未乾燥の封止用シートから離型層付き防湿フィルム(即ち、一時的防湿層(防湿フィルム1)/接着剤層/PETフィルム/離型層との積層構造を有するフィルム)を除去したシート(即ち、樹脂組成物層/離型層/PETフィルム/接着剤層/第1の防湿層(防湿フィルム1)との積層構造を有するシート)を、温度150℃の熱風乾燥炉内で樹脂組成物層を上にして乾燥した。次いで、製造例1で得られた離型層付き防湿フィルム(即ち、第2の防湿層(防湿フィルム1)/接着剤層/PETフィルム/離型層との積層構造を有するフィルム)と、乾燥した樹脂組成物層を有するシートとを、1013hPa且つ25℃における相対湿度6%RH(水分濃度(体積分率):1,800ppm)であり、且つ温度が30℃に調整されたボックス内にあるロールラミネータに搬送し、樹脂組成物層に、上記製造例1で得られた離型層付き防湿フィルムを、60℃に加温したゴムローラーにより0.3MPa以上の圧力で押し付けることで貼り合わせて、封止用シートを製造した。得られた封止用シートは、第2の防湿層(防湿フィルム1)/接着剤層/PETフィルム/離型層/樹脂組成物層/離型層/PETフィルム/接着剤層/第1の防湿層(防湿フィルム1)との積層構造を有していた。
水分濃度(体積分率)を0.1ppm未満(装置の検出限界0.1ppm)とした窒素グローブボックス内に150℃ホットプレートを用意した。製造例3で得られた未乾燥の封止用シートから離型層付き防湿フィルム(即ち、一時的防湿層(防湿フィルム1)/接着剤層/PETフィルム/離型層との積層構造を有するフィルム)を除去したあと、樹脂組成物面に離型層付きPETフィルム(水蒸気透過度:34g/m2/24hr、水分透過層として使用)をホットプレート上でゴムローラーにより0.3MPa以上の圧力で押し付け、気泡などの欠陥が発生しないように貼り合わせ、離型層付きPETフィルムと、樹脂組成物層と、離型層付き防湿フィルムを、これらの順に含む積層構造を製造した。より詳しくは、得られたシートは、PETフィルム/離型層/樹脂組成物層/離型層/PETフィルム/接着剤層/第1の防湿層(防湿フィルム1)との積層構造を有していた。このシートを、離型層付きPETフィルム(即ち、PETフィルム/離型層との積層構造を有するフィルム)を上にして30分間加熱することによって、樹脂組成物層を乾燥した。加熱停止から10分間経過した後、そのままグローブボックス内で、離型層付きPETフィルムと、乾燥した樹脂組成物層と、離型層付き防湿フィルムとを、これらの順に含む積層構造を有するシートの離型層付きPETフィルムに、製造例4で製造した粘着層付き防湿フィルム(即ち、第2の防湿層(防湿フィルム2)/粘着層の積層構造を有するフィルム)の粘着層側を、60℃に加温したゴムローラーにより0.3MPa以上の圧力で押し付けることで貼り合わせて、粘着層付き防湿フィルムと、離型層付きPETフィルムと、樹脂組成物層と、離型層付き防湿フィルムとを、これらの順に含む積層構造を有する、封止用シートを製造した。より詳しくは、得られた封止用シートは、第2の防湿層(防湿フィルム2)/粘着層/PETフィルム/離型層/樹脂組成物層/離型層/PETフィルム/接着剤層/第1の防湿層(防湿フィルム1)との積層構造を有していた。
実施例1と同様にして得られた、乾燥した未完成シートを、樹脂組成物が露出した状態で前記シートを25℃且つ40%RH(水分濃度(体積分率):12,500ppm)の大気雰囲気下に10分間放置し、次いで、前記シートの樹脂組成物層に、製造例1で得られた離型層付き防湿フィルムを、60℃に加温したゴムローラーにより0.3MPa以上の圧力で押し付けることで貼り合わせて、封止用シートを製造した。得られた封止用シートは、第2の防湿層(防湿フィルム1)/接着剤層/PETフィルム/離型層/樹脂組成物層/離型層/PETフィルム/接着剤層/第1の防湿層(防湿フィルム1)との積層構造を有していた。
製造例1で得られた離型層付き防湿フィルムの代わりに、離型層付きPETフィルムを使用したこと以外は実施例1と同様にして、封止用シートを製造した。得られた封止用シートは、非防湿層(PETフィルム)/離型層/樹脂組成物層/離型層/PETフィルム/接着剤層/第1の防湿層(防湿フィルム1)との積層構造を有していた。
製造例3で得られた未乾燥の封止用シートから「一時的防湿層(防湿フィルム1)/接着剤層/PETフィルム/離型層」部分を除去せずに、この一時的防湿層を第2の防湿層として使用し、実施例1と同様の乾燥条件(窒素グローブボックス内(水分濃度(体積分率):0.1ppm未満)のホットプレート(150℃)で第1の防湿層をホットプレート側にして30分間加熱乾燥)で乾燥し、封止用シートを製造した。得られた封止用シートは、第2の防湿層(防湿フィルム1)/接着剤層/PETフィルム/離型層/樹脂組成物層/離型層/PETフィルム/接着剤層/第1の防湿層(防湿フィルム1)との積層構造を有していた。
実施例1および2並びに比較例1~3で得られた封止用シートの、製造直後の樹脂組成物層の水分濃度(質量分率)(以下「製造直後の水分濃度(質量分率)」と記載する)および25℃および40%RHの雰囲気下に24時間静置した後の樹脂組成物層の水分濃度(質量分率)(以下「静置後の水分濃度(質量分率)」と記載する)を、以下の方法により算出した。結果を表1に示す。
Claims (9)
- 第1の防湿層と、樹脂組成物層と、第2の防湿層とを、これらの順に含む積層構造を有する封止用シートの製造方法であって、第2の防湿層が無い状態で樹脂組成物層を乾燥し、乾燥終了時から第2の防湿層を設けるまでの間、樹脂組成物層を低湿度雰囲気下に保持しながら第2の防湿層を設けることを含む方法。
- 第1の防湿層および第2の防湿層の水蒸気透過度が、それぞれ独立に、0~5(g/m2/24hr)である請求項1に記載の方法。
- 低湿度雰囲気の水分濃度(体積分率)が、3,300ppm以下である請求項1または2に記載の方法。
- 加熱によって樹脂組成物層を乾燥する請求項1~3のいずれか一項に記載の方法。
- 第1の防湿層と樹脂組成物層とを含み、第1の防湿層が存在する側とは反対側の樹脂組成物層の面が露出した積層構造を有するシートを加熱することによって、樹脂組成物層を乾燥する請求項4に記載の方法。
- 乾燥温度が、80~220℃である請求項4または5に記載の方法。
- 樹脂組成物層が、半焼成ハイドロタルサイトおよび/または焼成ハイドロタルサイトを含む請求項1~6のいずれか一項に記載の方法。
- 封止用シートが、電子デバイスの封止に用いられるシートである請求項1~7のいずれか一項に記載の方法。
- 電子デバイスが、有機ELデバイスまたは太陽電池である請求項8に記載の方法。
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