WO2011016408A1 - フィルム - Google Patents
フィルム Download PDFInfo
- Publication number
- WO2011016408A1 WO2011016408A1 PCT/JP2010/062993 JP2010062993W WO2011016408A1 WO 2011016408 A1 WO2011016408 A1 WO 2011016408A1 JP 2010062993 W JP2010062993 W JP 2010062993W WO 2011016408 A1 WO2011016408 A1 WO 2011016408A1
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- WIPO (PCT)
- Prior art keywords
- resin composition
- composition layer
- film
- hygroscopic
- organic
- Prior art date
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- WQEPLUUGTLDZJY-UHFFFAOYSA-N n-Pentadecanoic acid Natural products CCCCCCCCCCCCCCC(O)=O WQEPLUUGTLDZJY-UHFFFAOYSA-N 0.000 description 1
- NXPPAOGUKPJVDI-UHFFFAOYSA-N naphthalene-1,2-diol Chemical compound C1=CC=CC2=C(O)C(O)=CC=C21 NXPPAOGUKPJVDI-UHFFFAOYSA-N 0.000 description 1
- 125000001624 naphthyl group Chemical group 0.000 description 1
- 125000003518 norbornenyl group Chemical group C12(C=CC(CC1)C2)* 0.000 description 1
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- SLYCYWCVSGPDFR-UHFFFAOYSA-N octadecyltrimethoxysilane Chemical compound CCCCCCCCCCCCCCCCCC[Si](OC)(OC)OC SLYCYWCVSGPDFR-UHFFFAOYSA-N 0.000 description 1
- MSRJTTSHWYDFIU-UHFFFAOYSA-N octyltriethoxysilane Chemical compound CCCCCCCC[Si](OCC)(OCC)OCC MSRJTTSHWYDFIU-UHFFFAOYSA-N 0.000 description 1
- 229960003493 octyltriethoxysilane Drugs 0.000 description 1
- 239000010450 olivine Substances 0.000 description 1
- 229910052609 olivine Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- VSIIXMUUUJUKCM-UHFFFAOYSA-D pentacalcium;fluoride;triphosphate Chemical compound [F-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O VSIIXMUUUJUKCM-UHFFFAOYSA-D 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- IGALFTFNPPBUDN-UHFFFAOYSA-N phenyl-[2,3,4,5-tetrakis(oxiran-2-ylmethyl)phenyl]methanediamine Chemical compound C=1C(CC2OC2)=C(CC2OC2)C(CC2OC2)=C(CC2OC2)C=1C(N)(N)C1=CC=CC=C1 IGALFTFNPPBUDN-UHFFFAOYSA-N 0.000 description 1
- COLNVLDHVKWLRT-UHFFFAOYSA-N phenylalanine Natural products OC(=O)C(N)CC1=CC=CC=C1 COLNVLDHVKWLRT-UHFFFAOYSA-N 0.000 description 1
- XYFCBTPGUUZFHI-UHFFFAOYSA-O phosphonium Chemical compound [PH4+] XYFCBTPGUUZFHI-UHFFFAOYSA-O 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 229920000172 poly(styrenesulfonic acid) Polymers 0.000 description 1
- 229920002492 poly(sulfone) Polymers 0.000 description 1
- 229920002312 polyamide-imide Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920006393 polyether sulfone Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920006290 polyethylene naphthalate film Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920006324 polyoxymethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229940005642 polystyrene sulfonic acid Drugs 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 150000003141 primary amines Chemical class 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- LLHKCFNBLRBOGN-UHFFFAOYSA-N propylene glycol methyl ether acetate Chemical compound COCC(C)OC(C)=O LLHKCFNBLRBOGN-UHFFFAOYSA-N 0.000 description 1
- 150000003242 quaternary ammonium salts Chemical class 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001846 repelling effect Effects 0.000 description 1
- 238000000790 scattering method Methods 0.000 description 1
- 150000003335 secondary amines Chemical class 0.000 description 1
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- VEALVRVVWBQVSL-UHFFFAOYSA-N strontium titanate Chemical compound [Sr+2].[O-][Ti]([O-])=O VEALVRVVWBQVSL-UHFFFAOYSA-N 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-O sulfonium group Chemical group [SH3+] RWSOTUBLDIXVET-UHFFFAOYSA-O 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 125000002298 terpene group Chemical group 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- JRMUNVKIHCOMHV-UHFFFAOYSA-M tetrabutylammonium bromide Chemical compound [Br-].CCCC[N+](CCCC)(CCCC)CCCC JRMUNVKIHCOMHV-UHFFFAOYSA-M 0.000 description 1
- TXMIUMUSEKVUBH-UHFFFAOYSA-M tetrabutylphosphanium;2,2,2-trifluoroacetate Chemical compound [O-]C(=O)C(F)(F)F.CCCC[P+](CCCC)(CCCC)CCCC TXMIUMUSEKVUBH-UHFFFAOYSA-M 0.000 description 1
- GFZMLBWMGBLIDI-UHFFFAOYSA-M tetrabutylphosphanium;acetate Chemical compound CC([O-])=O.CCCC[P+](CCCC)(CCCC)CCCC GFZMLBWMGBLIDI-UHFFFAOYSA-M 0.000 description 1
- RKHXQBLJXBGEKF-UHFFFAOYSA-M tetrabutylphosphanium;bromide Chemical compound [Br-].CCCC[P+](CCCC)(CCCC)CCCC RKHXQBLJXBGEKF-UHFFFAOYSA-M 0.000 description 1
- WHDWTYUVZOXXKX-UHFFFAOYSA-M tetrabutylphosphanium;formate Chemical compound [O-]C=O.CCCC[P+](CCCC)(CCCC)CCCC WHDWTYUVZOXXKX-UHFFFAOYSA-M 0.000 description 1
- TUNFSRHWOTWDNC-HKGQFRNVSA-N tetradecanoic acid Chemical compound CCCCCCCCCCCCC[14C](O)=O TUNFSRHWOTWDNC-HKGQFRNVSA-N 0.000 description 1
- DDFYFBUWEBINLX-UHFFFAOYSA-M tetramethylammonium bromide Chemical compound [Br-].C[N+](C)(C)C DDFYFBUWEBINLX-UHFFFAOYSA-M 0.000 description 1
- BRKFQVAOMSWFDU-UHFFFAOYSA-M tetraphenylphosphanium;bromide Chemical compound [Br-].C1=CC=CC=C1[P+](C=1C=CC=CC=1)(C=1C=CC=CC=1)C1=CC=CC=C1 BRKFQVAOMSWFDU-UHFFFAOYSA-M 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 150000004992 toluidines Chemical class 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
- TVIVIEFSHFOWTE-UHFFFAOYSA-K tri(quinolin-8-yloxy)alumane Chemical compound [Al+3].C1=CN=C2C([O-])=CC=CC2=C1.C1=CN=C2C([O-])=CC=CC2=C1.C1=CN=C2C([O-])=CC=CC2=C1 TVIVIEFSHFOWTE-UHFFFAOYSA-K 0.000 description 1
- 150000003918 triazines Chemical class 0.000 description 1
- NMEPHPOFYLLFTK-UHFFFAOYSA-N trimethoxy(octyl)silane Chemical compound CCCCCCCC[Si](OC)(OC)OC NMEPHPOFYLLFTK-UHFFFAOYSA-N 0.000 description 1
- QLNOVKKVHFRGMA-UHFFFAOYSA-N trimethoxy(propyl)silane Chemical group [CH2]CC[Si](OC)(OC)OC QLNOVKKVHFRGMA-UHFFFAOYSA-N 0.000 description 1
- 229910021642 ultra pure water Inorganic materials 0.000 description 1
- 239000012498 ultrapure water Substances 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000001238 wet grinding Methods 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
Images
Classifications
-
- 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
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/16—Fillings or auxiliary members in containers or encapsulations, e.g. centering rings
- H01L23/18—Fillings characterised by the material, its physical or chemical properties, or its arrangement within the complete device
- H01L23/26—Fillings characterised by the material, its physical or chemical properties, or its arrangement within the complete device including materials for absorbing or reacting with moisture or other undesired substances, e.g. getters
-
- 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
- H10K50/844—Encapsulations
-
- 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
- H10K50/846—Passivation; Containers; Encapsulations comprising getter material or desiccants
Definitions
- the present invention relates to a specific film and further to an organic EL element device using the film.
- organic EL (Electroluminescence) element is a light-emitting element using an organic substance as a light-emitting material, and has been attracting attention in recent years because it can emit light with high luminance at a low voltage.
- organic EL elements are extremely sensitive to moisture, and the organic material itself is altered by moisture, resulting in a decrease in brightness, no light emission, the interface between the electrode and the organic EL layer being peeled off due to moisture, metal There is a problem that the metal oxide is oxidized to increase the resistance.
- Patent Document 1 proposes that an organic EL layer is formed on a glass substrate, a curable resin layer is laminated so as to cover the entire surface of the organic EL layer, and a non-permeable glass substrate is bonded.
- an acrylic ultraviolet curable resin composition is used for the curable resin layer, there is a problem of deterioration of the organic EL element due to ultraviolet rays, and an uncured portion is generated in a place where the ultraviolet rays do not reach. It was not satisfactory in that it was difficult to obtain a highly sealing structure.
- Patent Document 2 proposes a thermosetting curable resin composition that seals the entire surface of an organic EL element.
- the obtained cured product layer was not satisfactory in that the moisture permeability resistance was not sufficient.
- An object of the present invention is to provide a film having both sufficient moisture permeability resistance and element damage resistance, which is advantageous for forming a highly reliable sealing structure.
- the present invention includes the following aspects.
- a film comprising a support, a protective resin composition layer, and a hygroscopic resin composition layer.
- the protective resin composition layer contains an inorganic filler (excluding a hygroscopic metal oxide).
- a film having a support, a protective resin composition layer, and a hygroscopic resin composition layer provides a film having both sufficient moisture permeation resistance and element damage resistance (that is, a function for preventing element damage). I was able to do that.
- FIG. 1A is a schematic cross-sectional view of the organic EL device of Example 1
- FIGS. 1B to 1E are schematic cross-sectional views of the organic EL devices of Comparative Examples 1 to 4.
- 6 is a SEM photograph of a film cross section of Test Example 4.
- 10 is a SEM photograph of a film cross section of Test Example 5.
- 10 is a SEM photograph of a film cross section of Test Example 6.
- Hygroscopic resin composition layer (containing inorganic filler and hygroscopic metal oxide) 3 Protective resin composition layer (inorganic filler, hygroscopic metal oxide free) 4 Organic EL element 5 Substrate 6 Resin composition layer (containing inorganic filler, no hygroscopic metal oxide) 7 Hygroscopic metal oxide
- the film of the present invention has a support, a hygroscopic resin composition layer, and a protective resin composition layer.
- the support used in the present invention means “a substance that supports the protective resin composition layer or the hygroscopic resin composition layer”, but is not particularly limited as long as it exhibits its function.
- the support is classified into a peeling system support and a sealing system support.
- the release-type support means a support that can be peeled off during production of various devices (that is, a support that is peeled (separated) from the film of the present invention during the production of various devices).
- a release support include polyethylene, polypropylene, polyolefins such as polyvinyl chloride, polyethylene terephthalate (hereinafter sometimes abbreviated as “PET”), and polyethylene naphthalate (hereinafter abbreviated as “PEN”).
- PET polyethylene terephthalate
- PEN polyethylene naphthalate
- PEN polyethylene naphthalate
- a film made of a plastic such as polyester, polycarbonate, and polyimide. From the viewpoint of cost performance, a polyethylene terephthalate film and a polyethylene naphthalate film are preferable, and a polyethylene terephthalate film is more preferable.
- the thickness of the release support is not particularly limited, but from the viewpoint of the handleability of the film of the present invention, the upper limit of the support is preferably 150 ⁇ m or less, more preferably 120 ⁇ m or less, and even more preferably 90 ⁇ m or less.
- the lower limit of the thickness is preferably 10 ⁇ m or more, more preferably 40 ⁇ m or more, and even more preferably 70 ⁇ m or more from the viewpoints of the handleability and moisture resistance of the film of the present invention.
- the release support is preferably subjected to a release treatment in advance.
- a release agent used for the release treatment specifically, a fluorine release agent, a silicone release agent, an alkyd resin type Examples include mold release agents. You may use a mold release agent 1 type or in mixture of 2 or more types.
- the surface of the release support may be subjected to mat treatment, corona treatment, or the like, and a release treatment may be further performed on the surface subjected to these treatments.
- the sealing support can be used as a part of various devices as they are at the time of manufacturing various devices (that is, used for manufacturing various devices and incorporated into devices finally manufactured), and has moisture resistance. It means a support. More specifically, the support is arranged in the outermost layer separated from the element formation substrate on which the elements (semiconductor elements, LED elements, organic EL elements, etc.) are formed in the sealing structure of various devices. Used as a sealing material. Examples of the support include metal foil and a laminated film in which a metal foil or an inorganic vapor deposition film is laminated on at least one surface of a plastic film.
- examples of the metal foil include copper foil and aluminum foil
- examples of the inorganic deposited film include deposited films of silicon oxide (silica), silicon nitride, SiCN, amorphous silicon, and the like.
- the said support body can use the plastic film which has a moisture-proof property marketed, for example, the tech barrier HX, AX, LX, L series (made by Mitsubishi resin company) and further improved the moisture-proof effect. X-BARRIER (manufactured by Mitsubishi Plastics) and the like.
- a glass plate, a metal plate, etc. can also be used from a viewpoint that rigidity can be provided.
- the light emitting surface of the produced organic EL device is the surface on which the organic EL element of the element formation substrate is formed. It will be the opposite side.
- the thickness of the support is not particularly limited when a metal foil is used for the sealing support or a laminated film in which an inorganic vapor deposition film or a metal foil is laminated on at least one surface of a plastic film.
- the upper limit of the thickness of the support is preferably 150 ⁇ m or less, more preferably 120 ⁇ m or less, and still more preferably 90 ⁇ m or less.
- the lower limit of the thickness is preferably 10 ⁇ m or more, more preferably 40 ⁇ m or more, and even more preferably 70 ⁇ m or more from the viewpoints of the handleability and moisture resistance of the film of the present invention.
- the upper limit of the thickness of the support in the case of using a glass plate or a metal plate for the sealing support is preferably 5 mm or less, more preferably 1 mm or less, and 100 ⁇ m from the viewpoint of making the organic EL device itself thin and light. The following is more preferable.
- the lower limit of the thickness of the support is preferably 5 ⁇ m or more, more preferably 10 ⁇ m or more, and still more preferably 20 ⁇ m or more from the viewpoint of preventing moisture permeation and the rigidity of the organic EL device.
- a laminated film in which metal foil is laminated on at least one side of a plastic film is coated with an adhesive on a plastic film such as a PET film using a coating head capable of thin film coating such as a gravure coater. It can be obtained by laminating a metal foil such as aluminum.
- the thickness of the metal foil is preferably 5 ⁇ m or more from the viewpoint of laminating properties, moisture permeability resistance, etc., and is preferably 125 ⁇ m or less from the viewpoint of handleability.
- the total thickness of this three-layer laminated film is preferably in the range of 10 ⁇ m to 150 ⁇ m.
- the hygroscopic resin composition layer used for the film of the present invention is composed of a thermosetting resin composition containing a thermosetting resin, a curing agent, and a hygroscopic metal oxide, and has moisture permeability resistance. Thereby, in the sealing structure of the target device (organic EL device or the like), moisture intrusion into the element (organic EL device or the like) is blocked.
- thermosetting resin and curing agent are not particularly limited, and specifically, various thermosettings such as epoxy resin, cyanate ester resin, phenol resin, bismaleimide-triazine resin, polyimide resin, acrylic resin, vinyl benzyl resin, etc. Resins and their curing agents. Of these, an epoxy resin and its curing agent are preferable from the viewpoints of low-temperature curability and adhesiveness of a cured product.
- epoxy resin those having an average of two or more epoxy groups per molecule may be used.
- bisphenol A type epoxy resin biphenyl type epoxy resin, biphenyl aralkyl type epoxy resin, and naphthol type epoxy are used.
- alicyclic epoxy resin aliphatic chain epoxy resin
- phenol novolac epoxy resin cresol novolac epoxy resin
- bisphenol A novolac epoxy resin Epoxy resin having a butadiene structure, phenol aralkyl type epoxy resin, epoxy resin having a dicyclopentadiene structure, diglycidyl ether
- bisphenol A type epoxy resin bisphenol F type epoxy resin, phenol novolac type epoxy resin, biphenyl aralkyl type epoxy resin, phenol aralkyl type epoxy from the viewpoint of maintaining high heat resistance and low moisture permeability of the resin composition.
- a resin, an aromatic glycidylamine type epoxy resin, an epoxy resin having a dicyclopentadiene structure, and the like are preferable.
- the epoxy resin may be liquid, solid, or both liquid and solid.
- “liquid” and “solid” are states of the epoxy resin at 25 ° C. From the viewpoint of coatability, workability, adhesiveness, etc., it is preferable that 10% by weight or more of the entire epoxy resin to be used is liquid.
- the epoxy resin preferably has an epoxy equivalent in the range of 100 to 1000, more preferably in the range of 120 to 1000, from the viewpoint of reactivity.
- the epoxy equivalent is the number of grams (g / eq) of a resin containing 1 gram equivalent of an epoxy group, and is measured according to the method defined in JIS K-7236.
- the curing agent for the epoxy resin is not particularly limited as long as it has a function of curing the epoxy resin, but from the viewpoint of suppressing thermal deterioration of the element (particularly the organic EL element) during the curing treatment of the resin composition.
- the curing treatment of the composition is preferably performed at 140 ° C. or lower, more preferably 120 ° C. or lower, and the curing agent preferably has an epoxy resin curing action in such a temperature range.
- amine adduct-based compounds Amicure PN-23, Amicure MY-24, Amicure PN-D, Amicure MY-D, Amicure PN-H, Amicure MY-H, Amicure PN-31, Amicure PN-40, Amicure PN-40J, etc. (all Ajinomoto Fine Techno)
- organic acid dihydrazide Amicure VDH-J, Amicure UDH, Amicure LDH, etc. (all manufactured by Ajinomoto Fine Techno Co.) and the like are preferable. You may use these 1 type or in combination of 2 or more types.
- the ionic liquid has an advantageous effect on improving the moisture permeation resistance of the cured product of the hygroscopic resin composition layer.
- the ionic liquid is preferably used in a state where the ionic liquid is uniformly dissolved in the epoxy resin.
- Examples of the cation constituting the ionic liquid include imidazolium ions, piperidinium ions, pyrrolidinium ions, pyrazonium ions, guanidinium ions, pyridinium ions, and other ammonium cations; tetraalkylphosphonium cations (specifically, tetrabutyl Phosphonium cations such as phosphonium ions and tributylhexylphosphonium ions; and sulfonium cations such as triethylsulfonium ions.
- anion constituting the ionic liquid examples include halide anions such as fluoride ion, chloride ion, bromide ion and iodide ion; alkyl sulfate anions such as methanesulfonate ion; trifluoromethanesulfonate ion, Fluorine-containing compound anions such as hexafluorophosphonate ion, trifluorotris (pentafluoroethyl) phosphonate ion, bis (trifluoromethanesulfonyl) imide ion, trifluoroacetate ion, tetrafluoroborate ion; phenol ion, 2-methoxy Phenolic anions such as phenol ion and 2,6-di-tert-butylphenol ion; acidic amino acid ions such as aspartate ion and glutamate ion; glycine ion, alan
- R—CO— is an acyl group derived from a linear or branched fatty acid having 1 to 5 carbon atoms, or a substituted or unsubstituted benzoyl group, and —NH—CHX—CO 2 — is an asparagine.
- Acidic amino acid ions such as acid and glutamic acid, or neutral amino acid ions such as glycine, alanine and phenylalanine.
- the cation is preferably an ammonium cation or a phosphonium cation, and more preferably an imidazolium ion or a phosphonium ion. More specifically, the imidazolium ion is 1-ethyl-3-methylimidazolium ion, 1-butyl-3-methylimidazolium ion, 1-propyl-3-methylimidazolium ion or the like.
- the anion is preferably a phenolic anion, an N-acylamino acid ion or a carboxylic acid anion represented by the general formula (1), and more preferably an N-acylamino acid ion or a carboxylic acid anion.
- phenolic anion examples include 2,6-di-tert-butylphenol ion.
- carboxylate anion examples include acetate ion, decanoate ion, 2-pyrrolidone-5-carboxylate ion, formate ion, ⁇ -lipoic acid ion, lactate ion, tartrate ion, hippurate ion, N- Methyl hippurate ion and the like, among which acetate ion, 2-pyrrolidone-5-carboxylate ion, formate ion, lactate ion, tartrate ion, hippurate ion and N-methylhippurate ion are preferable, acetate ion, N -Methyl hippurate ion and formate ion are particularly preferred.
- N-acylamino acid ion represented by the general formula (1) examples include N-benzoylalanine ion, N-acetylphenylalanine ion, aspartate ion, glycine ion, N-acetylglycine ion, and the like.
- N-benzoylalanine ion, N-acetylphenylalanine ion and N-acetylglycine ion are preferable, and N-acetylglycine ion is particularly preferable.
- Specific ionic liquids include 1-butyl-3-methylimidazolium lactate, tetrabutylphosphonium-2-pyrrolidone-5-carboxylate, tetrabutylphosphonium acetate, tetrabutylphosphonium decanoate, tetrabutylphosphonium trifluoroacetate , Tetrabutylphosphonium ⁇ -lipoate, tetrabutylphosphonium formate, tetrabutylphosphonium lactate, bis (tetrabutylphosphonium) tartrate, tetrabutylphosphonium hippurate, tetrabutylphosphonium N-methylhippurate, benzoyl-DL-alanine Tetrabutylphosphonium salt, N-acetylphenylalanine tetrabutylphosphonium salt, 2,6-di-tert-butylphenol tetrabutylphosphonium salt L-aspartic acid
- a precursor composed of a cation moiety such as an alkylimidazolium, alkylpyridinium, alkylammonium and alkylsulfonium ions and an anion moiety containing a halogen is added to NaBF 4 , NaPF 6 , CF 3 SO 3
- an anion and a cation are used in an equivalent amount, and the solvent in the obtained reaction solution can be distilled off and used as it is, or an organic solvent (methanol, toluene, etc.). , Ethyl acetate, acetone, etc.) may be concentrated.
- the curing agent is preferably used in the range of 0.1 to 50% by weight, more preferably in the range of 0.5 to 25% by weight, with respect to 100% by weight of the nonvolatile content in the resin composition.
- the range of wt% is more preferred, and the range of 1.5 to 10 wt% is even more preferred. If the amount is less than this range, sufficient curability may not be obtained. If the amount is more than 50% by weight, not only the storage stability of the resin composition is impaired, but also the moisture permeability and heat resistance of the cured product are lowered. There are things to do.
- an ionic liquid is used, from the viewpoint of moisture permeation resistance of the cured product of the resin composition, it is preferably 0.1 to 10% by weight with respect to 100% by weight of the non-volatile content of the epoxy resin, 0.5 to 8 wt% is more preferable, 1 to 6 wt% is further preferable, and 1.5 to 5 wt% is still more preferable.
- the resin composition constituting the hygroscopic resin composition layer in the present invention may further contain a curing accelerator for adjusting the curing temperature, the curing time, and the like.
- a curing accelerator for adjusting the curing temperature, the curing time, and the like.
- the curing accelerator include quaternary ammonium salts such as tetramethylammonium bromide and tetrabutylammonium bromide, quaternary sulfonium salts such as tetraphenylphosphonium bromide and tetrabutylphosphonium bromide, DBU (1,8-diazabicyclo (5.4.0).
- the content is in the range of 0.01 to 7% by weight based on the total amount of the epoxy resin.
- the “hygroscopic metal oxide” as used in the present invention is a metal oxide that has the ability to absorb moisture and chemically reacts with moisture that has been absorbed to become a hydroxide, so long as the object of the present invention can be achieved.
- calcined dolomite a mixture containing calcium oxide and magnesium oxide
- calcined hydrotalcite solid solution of calcium oxide and aluminum oxide
- Such a hygroscopic metal oxide is known as a hygroscopic material in various technical fields, and a commercially available product can be used. Specifically, calcined dolomite (such as “KT” manufactured by Yoshizawa Lime Co., Ltd.), calcium oxide (such as “Moystop # 10” manufactured by Sankyo Flour Mills), magnesium oxide (“Kyowa Mag MF-150” manufactured by Kyowa Chemical Industry Co., Ltd.), “ Kyowa Mag MF-30 ”,“ Pure Mag FNMG ”manufactured by Tateho Chemical Industry Co., Ltd.), lightly burned magnesium oxide (“ # 500 ”,“ # 1000 ”,“ # 5000 ”etc. manufactured by Tateho Chemical Industry Co., Ltd.), and the like.
- dolomite such as “KT” manufactured by Yoshizawa Lime Co., Ltd.
- calcium oxide such as “Moystop # 10” manufactured by Sankyo Flour Mills
- magnesium oxide (“Kyowa Mag MF
- the average particle diameter of the hygroscopic metal oxide is not particularly limited, but is preferably 10 ⁇ m or less, more preferably 5 ⁇ m or less, and even more preferably 1 ⁇ m or less. By using such a fine size, not only a high moisture permeation resistance can be imparted to the cured layer of the hygroscopic resin composition, but also the adhesive strength can be increased. In addition, if the average particle diameter of the hygroscopic metal oxide is too small, the average particle diameter of the hygroscopic metal oxide is 0.01 ⁇ m from the viewpoint that the particles are aggregated and the sheet processing tends to be difficult. The above is preferable, and 0.1 ⁇ m or more is preferable.
- the average particle size of the hygroscopic metal oxide is 10 ⁇ m or less, it can be used as it is, but if the average particle size of the commercial product exceeds 10 ⁇ m, the average particle size is 10 ⁇ m or less by pulverization, classification, etc. It is preferable to use after preparing the granular material.
- the “average particle size” here is the median diameter of the particle size distribution when the particle size distribution of the measurement target (granular material) is created on a volume basis.
- the volume-based particle size distribution can be measured by a laser diffraction / scattering method based on the Mie scattering theory. Specifically, as a laser diffraction particle size distribution measuring apparatus, LA-500 manufactured by HORIBA, Ltd. Can be used. It is preferable to use a measurement sample in which a hygroscopic metal oxide is dispersed in water by ultrasonic waves.
- hygroscopic metal oxide a surface treated with a surface treatment agent can be used.
- a surface-treated hygroscopic metal oxide By using such a surface-treated hygroscopic metal oxide, the storage stability of the resin composition constituting the hygroscopic resin composition layer can be further increased, and moisture and moisture absorption in the resin can be improved before curing.
- the reactive metal oxide can be prevented from reacting.
- the surface treatment agent used for the surface treatment include higher fatty acids, alkylsilanes, silane coupling agents, and the like, among which higher fatty acids or alkylsilanes are preferable.
- the higher fatty acid is preferably a higher fatty acid having 18 or more carbon atoms such as stearic acid, montanic acid, myristic acid, and palmitic acid, and stearic acid is more preferable. These may be used alone or in combination of two or more.
- Alkylsilanes include methyltrimethoxysilane, ethyltrimethoxysilane, hexyltrimethoxysilane, octyltrimethoxysilane, decyltrimethoxysilane, octadecyltrimethoxysilane, dimethyldimethoxysilane, octyltriethoxysilane, n-octadecyldimethyl ( And 3- (trimethoxysilyl) propyl) ammonium chloride. You may use these 1 type or in combination of 2 or more types.
- silane coupling agent examples include 3-glycidyloxypropyltrimethoxysilane, 3-glycidyloxypropyltriethoxysilane, 3-glycidyloxypropyl (dimethoxy) methylsilane, and 2- (3,4-epoxycyclohexyl).
- Epoxy silane coupling agents such as ethyltrimethoxysilane; mercaptosilanes such as 3-mercaptopropyltrimethoxysilane, 3-mercaptopropyltriethoxysilane, 3-mercaptopropylmethyldimethoxysilane and 11-mercaptoundecyltrimethoxysilane Coupling agent; 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-aminopropyldimethoxymethylsilane, N-phenyl-3-aminopropyl Amino systems such as limethoxysilane, N-methylaminopropyltrimethoxysilane, N- (2-aminoethyl) -3-aminopropyltrimethoxysilane and N- (2-aminoethyl) -3-aminopropyldimethoxymethylsilane Silane coupling agents;
- the surface treatment can be performed by adding and spraying a surface treatment agent while stirring and dispersing untreated hygroscopic metal oxide in a mixer at room temperature and stirring for 5 to 60 minutes.
- a surface treatment agent known mixers can be used. Specific examples include blenders such as V blenders, ribbon blenders and bubble cone blenders, mixers such as Henschel mixers and concrete mixers, ball mills and cutter mills. It is done.
- a method of surface treatment by mixing the higher fatty acid, alkylsilanes or silane coupling agent is also possible.
- the treatment amount of the surface treatment agent varies depending on the type of the hygroscopic metal oxide or the type of the surface treatment agent, but is preferably 1 to 10% by weight with respect to the hygroscopic metal oxide.
- the upper limit of the content of the hygroscopic metal oxide in the resin composition is that when the content of the hygroscopic metal oxide is excessive, the viscosity of the resin composition increases, and the strength of the cured product decreases and becomes brittle. In view of the above, it is preferably 40% by weight or less, more preferably 35% by weight or less, still more preferably 30% by weight or less, still more preferably 25% by weight or less, based on 100% by weight of the nonvolatile content in the resin composition. The weight percent or less is particularly preferred.
- the lower limit of the content of the hygroscopic metal oxide is 1% by weight or more with respect to 100% by weight of the non-volatile content in the resin composition from the viewpoint of sufficiently obtaining the effect of containing the hygroscopic metal oxide. Is preferable, 5% by weight or more is more preferable, and 10% by weight or more is still more preferable.
- the resin composition constituting the hygroscopic resin composition layer may further contain an inorganic filler (however, excluding the hygroscopic metal oxide).
- an inorganic filler By containing the inorganic filler, the moisture permeability of the cured product of the resin composition is improved, and the composition is prevented from being repelled during film production, and the adhesive strength with the support or the sealing material is increased. Can be improved.
- the inorganic filler examples include silica, barium sulfate, aluminum hydroxide, magnesium hydroxide, calcium carbonate, magnesium carbonate, boron nitride, aluminum borate, barium titanate, strontium titanate, calcium titanate, titanium
- examples include magnesium oxide, bismuth titanate, titanium oxide, barium zirconate, calcium zirconate, talc, clay, mica, boehmite, zeolite, apatite, kaolin, mullite, spinel, olivine, sericite, bentonite and the like.
- the inorganic filler may be used alone or in combination of two or more.
- the talc, clay, mica, boehmite and the like are preferably in the form of a flat plate, and the particle form is preferably a flat plate.
- the upper limit of the average particle size of the inorganic filler is preferably 1 ⁇ m or less, more preferably 0.8 ⁇ m or less, from the viewpoint of improving dispersibility and preventing reduction in mechanical strength and from the viewpoint that the inorganic filler is difficult to migrate to other layers during lamination. Preferably, it is 0.6 ⁇ m or less.
- the lower limit of the average particle size of the inorganic filler is preferably 0.01 ⁇ m or more, more preferably 0.1 ⁇ m or more, from the viewpoint of preventing dispersibility from being reduced due to aggregation and preventing deterioration in handleability due to increased viscosity of the resin composition. Preferably, 0.3 ⁇ m or more is more preferable.
- the average particle diameter here is synonymous with the average particle diameter in the above-mentioned hygroscopic metal oxide.
- the upper limit of the content of the inorganic filler in the resin composition is that when the content of the inorganic filler is excessively increased, the viscosity of the resin composition increases, and the strength of the cured product decreases and becomes brittle. It is preferably 50% by weight or less, more preferably 40% by weight or less, still more preferably 35% by weight or less, and even more preferably 30% by weight or less with respect to 100% by weight of the nonvolatile content in the resin composition.
- the lower limit of the content of the inorganic filler is preferably 1% by weight or more, preferably 5% by weight or more with respect to 100% by weight of the nonvolatile content in the resin composition, from the viewpoint of sufficiently obtaining the effect of the inorganic filler. More preferred is 10% by weight or more.
- the resin composition constituting the moisture-absorbing resin composition layer can further contain rubber particles, and by including the rubber particles, the mechanical strength of the cured product of the resin composition can be improved and the stress can be relaxed. Can do.
- the rubber particles do not dissolve in the organic solvent when preparing the varnish of the resin composition, are incompatible with the components in the resin composition such as epoxy resin, and exist in a dispersed state in the varnish of the resin composition Those that do are preferred.
- Such rubber particles can generally be prepared by increasing the molecular weight of the rubber component to a level that does not dissolve in an organic solvent or resin and making it into particles.
- core-shell type rubber particles examples thereof include acrylonitrile butadiene rubber particles, crosslinked styrene butadiene rubber particles, and acrylic rubber particles.
- the core-shell type rubber particle is a rubber particle having a core layer and a shell layer.
- the outer shell layer is a glassy polymer
- the inner core layer is a rubbery polymer.
- a three-layer structure in which the outer shell layer is a glassy polymer, the intermediate layer is a rubbery polymer, and the core layer is a glassy polymer can be used.
- the glass layer is composed of a polymer of methyl methacrylate or the like
- the rubbery polymer layer is specifically composed of a butyl acrylate polymer (butyl acrylate rubber) or the like.
- the upper limit of the average particle size of the primary particles of these rubber particles is 2 ⁇ m or less from the viewpoint of maintaining the stress relaxation effect and preventing damage to the device when the organic EL device is sealed with the resin composition.
- the lower limit of the average particle size of the primary particles of the rubber particles is preferably 0.05 ⁇ m or more from the viewpoint of preventing the handleability from deteriorating due to an increase in viscosity when mixed into the resin.
- core-shell type rubber particles include Staphyloid AC3832, AC3816N (manufactured by Ganz Kasei Co., Ltd.), Metabrene KW-4426 (manufactured by Mitsubishi Rayon Co., Ltd.), F351 (manufactured by Nippon Zeon Co., Ltd.), and the like.
- Specific examples of acrylonitrile butadiene rubber (NBR) particles include XER-91 (manufactured by JSR).
- SBR styrene butadiene rubber
- acrylic rubber particles include Methbrene W300A and W450A (manufactured by Mitsubishi Rayon Co., Ltd.).
- the average particle diameter of the rubber particles can be measured using a dynamic light scattering method. Specifically, rubber particles are uniformly dispersed in an appropriate organic solvent by ultrasonic waves, etc., and the particle size distribution of the rubber particles is created on a weight basis using FPRA-1000 (manufactured by Otsuka Electronics Co., Ltd.). Is the average particle size.
- the upper limit of the content of the rubber particles is preferably 20% by weight or less with respect to 100% by weight of the nonvolatile content in the moisture absorbent resin composition layer, from the viewpoint of preventing the heat resistance and moisture permeability of the moisture absorbent resin composition layer from being lowered. 10 weight% or less is more preferable.
- the lower limit of the content of the rubber particles is preferably 0.1% by weight or more with respect to 100% by weight of the nonvolatile content in the moisture absorbent resin composition layer from the viewpoint of sufficiently obtaining the effect of blending the rubber particles. .
- a rubber particle-dispersed epoxy resin in which rubber particles are dispersed in the state of primary particles in an epoxy resin is commercially available.
- the resin composition contains rubber particles. May be.
- a rubber particle-dispersed epoxy resin specifically, “BPA328” manufactured by Nippon Shokubai Co., Ltd.
- rubber particles acrylic core-shell type resin, average particle diameter of rubber particles: 0.3 ⁇ m, rubber particle content: 17% by weight, epoxy resin: bisphenol A type epoxy resin having an epoxy equivalent of 185), “MX120” manufactured by Kaneka Corporation (rubber particles: SBR resin, average particle size of rubber particles: 0.1 ⁇ m, rubber particle content: 25 Weight%, epoxy resin: bisphenol A type epoxy resin having an epoxy equivalent of 185) and the like.
- the resin composition constituting the hygroscopic resin composition layer can further contain a thermoplastic resin.
- a thermoplastic resin By containing a thermoplastic resin, flexibility can be imparted to the cured product of the resin fat composition, and good processability when coating the resin composition can be imparted.
- the thermoplastic resin include phenoxy resin, polyvinyl acetal resin, polyimide resin, polyamideimide resin, polyethersulfone resin, and polysulfone resin. Any one of these thermoplastic resins may be used, or two or more thereof may be mixed and used.
- the thermoplastic resin preferably has a weight average molecular weight of 10,000 or more, more preferably 30,000 or more, from the viewpoint of imparting flexibility and preventing repelling during coating. However, if the weight average molecular weight is too large, the compatibility with the epoxy resin tends to be reduced. Therefore, the weight average molecular weight is preferably 1,000,000 or less, more preferably 800,000 or less. .
- the weight average molecular weight of a thermoplastic resin here is measured by the gel permeation chromatography (GPC) method (polystyrene conversion).
- GPC gel permeation chromatography
- the weight average molecular weight measured by the GPC method is LC-9A / RID-6A manufactured by Shimadzu Corporation as a measuring device, and Shodex K-800P / K-804L / K-804L manufactured by Showa Denko KK as a column.
- chloroform or the like as a phase, the measurement can be performed at a column temperature of 40 ° C., and a standard polystyrene calibration curve can be used.
- the phenoxy resin is particularly preferable as the thermoplastic resin.
- the phenoxy resin is preferable because it has good compatibility with the “epoxy resin” and has little influence on the adhesiveness and moisture resistance of the cured product of the resin composition.
- phenoxy resin examples include bisphenol A skeleton, bisphenol F skeleton, bisphenol S skeleton, bisphenol acetophenone skeleton, novolac skeleton, biphenyl skeleton, fluorene skeleton, dicyclopentadiene skeleton, norbornene skeleton, naphthalene skeleton, anthracene skeleton, adamantane skeleton, terpene skeleton, Examples thereof include those having one or more skeletons selected from a trimethylcyclohexane skeleton. Two or more phenoxy resins may be mixed and used.
- phenoxy resins include 1256 and 4250 (bisphenol A skeleton-containing phenoxy resin) manufactured by Japan Epoxy Resin, YX8100 (bisphenol S skeleton-containing phenoxy resin) manufactured by Japan Epoxy Resin, and manufactured by Japan Epoxy Resin.
- YX6954 bisphenolacetophenone skeleton-containing phenoxy resin
- Union Carbide PKHH weight average molecular weight (Mw) 42600, number average molecular weight (Mn) 11200
- YL7553BH30, YL6794, YL7213, YL7290, YL7482 etc. can also be mentioned.
- the upper limit of the content of the thermoplastic resin is preferably 50% by weight or less, preferably 25% by weight or less, with respect to 100% by weight of the nonvolatile content in the moisture absorbent resin composition layer, from the viewpoint of preventing moisture permeability deterioration of the cured product. Is more preferable.
- the lower limit of the content of the thermoplastic resin is 1% by weight or more with respect to 100% by weight of the nonvolatile content in the hygroscopic resin composition layer from the viewpoint of obtaining a sufficient effect by including the thermoplastic resin. It is preferably 3% by weight or more, more preferably 5% by weight or more, and still more preferably 10% by weight or more.
- the moisture-absorbing resin composition layer used in the present invention further contains a coupling agent, thereby allowing the cured product to adhere to an adherend (support, protective resin composition layer, sealing material, etc.). And the moisture resistance of the cured product can be improved.
- a coupling agent include a titanium coupling agent, an aluminum coupling agent, and a silane coupling agent. Among these, a silane coupling agent is preferable. You may use these 1 type or in combination of 2 or more types.
- silane coupling agent examples include 3-glycidyloxypropyltrimethoxysilane, 3-glycidyloxypropyltriethoxysilane, 3-glycidyloxypropyl (dimethoxy) methylsilane, and 2- (3,4-epoxycyclohexyl).
- Epoxy silane coupling agents such as ethyltrimethoxysilane; mercaptosilanes such as 3-mercaptopropyltrimethoxysilane, 3-mercaptopropyltriethoxysilane, 3-mercaptopropylmethyldimethoxysilane and 11-mercaptoundecyltrimethoxysilane Coupling agent; 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-aminopropyldimethoxymethylsilane, N-phenyl-3-aminopropyl Amino systems such as limethoxysilane, N-methylaminopropyltrimethoxysilane, N- (2-aminoethyl) -3-aminopropyltrimethoxysilane and N- (2-aminoethyl) -3-aminopropyldimethoxymethylsilane Silane coupling agents;
- the upper limit of the content of the coupling agent is preferably 10% by weight or less with respect to 100% by weight of the nonvolatile content in the hygroscopic resin composition layer, from the viewpoint of obtaining an adhesion improving effect by adding the coupling agent. The following is more preferable.
- the lower limit of the content of the coupling agent is also preferably 0.5% by weight or more with respect to 100% by weight of the non-volatile content in the hygroscopic resin composition layer from the viewpoint of obtaining the effect of improving the adhesion by adding the coupling agent. .
- the moisture absorbent resin composition layer used in the present invention may optionally contain various additives other than the above-described components within the range where the effects of the present invention are exhibited.
- additives include organic fillers such as silicone powder, nylon powder, and fluorine powder, thickeners such as Orben and Benton, silicone-based, fluorine-based, and polymer-based antifoaming agents.
- adhesion promoters such as leveling agents, triazole compounds, thiazole compounds, triazine compounds, and porphyrin compounds.
- the thickness of the hygroscopic resin composition layer used in the present invention is not particularly limited. However, in the structure in which a support is laminated on the resin composition layer, moisture permeation is only from the side of the resin composition layer. From the viewpoint of blocking moisture by reducing the thickness of the composition layer and reducing the contact area with the outside air, the upper limit of the thickness is preferably 200 ⁇ m or less, more preferably 150 ⁇ m or less, and even more preferably 100 ⁇ m or less. On the other hand, from the viewpoint of securing a moisture absorbent concentration for obtaining a sufficient moisture absorption effect, the lower limit of the thickness is preferably 3 ⁇ m or more, more preferably 5 ⁇ m or more, and even more preferably 10 ⁇ m or more.
- the protective resin composition layer used for the film of the present invention is composed of a thermosetting resin and a thermosetting resin composition containing a curing agent, and in a sealing structure of a target device (such as an organic EL device), By directly covering an element (such as an organic EL element), the hygroscopic metal oxide in the hygroscopic resin composition layer has a role of preventing the element from being damaged due to contact with the element.
- thermosetting resin and curing agent As the thermosetting resin and the curing agent, those similar to the thermosetting resin and the curing agent used in the moisture absorbent resin composition layer described above are used.
- the thermosetting resin and curing agent used for the protective resin composition layer and the thermosetting resin and curing agent used for the moisture absorbent resin composition layer may be different from each other.
- the thermosetting resin and curing agent used for the protective resin composition layer and the thermosetting property used for the hygroscopic resin composition layer from the viewpoint of suppressing the interfacial stress between both layers after curing due to the difference in curing speed
- the resin and the curing agent are preferably the same.
- the protective resin composition layer used in the present invention may further contain a hygroscopic metal oxide within a range not impairing the damage prevention function of the organic EL element.
- a hygroscopic metal oxide By containing a hygroscopic metal oxide, moisture permeability resistance can be improved.
- the upper limit of the content of the hygroscopic metal oxide is 100% of the non-volatile content in the protective resin composition layer from the viewpoint of preventing damage to the organic EL element. 5 wt% or less is preferable with respect to wt%.
- the lower limit of the content of the hygroscopic metal oxide is preferably 0.5% by weight or more with respect to 100% by weight of the nonvolatile content in the protective resin composition layer from the viewpoint of obtaining the effect of improving moisture permeability.
- the particle size of the hygroscopic metal oxide is large. Since the organic EL element may be damaged, the average particle diameter of the hygroscopic metal oxide is preferably less than 1 ⁇ m. Even if the average particle size is less than 1 ⁇ m, if the particle size distribution is broad, coarse particles are included and the organic EL element may be damaged. Therefore, the average particle size is less than 1 ⁇ m, and the particle size Is more preferable that does not contain particles of 3 ⁇ m or more.
- the hygroscopic metal oxide contained in the protective resin composition layer can be the same metal oxide as the hygroscopic metal oxide contained in the above-described hygroscopic resin composition layer, and the surface treatment and the like can also be performed. It can be applied in a similar manner. Moreover, if the average particle diameter of the hygroscopic metal oxide is less than 1 ⁇ m, it can be used as it is, but if the average particle diameter of the commercially available product is 1 ⁇ m or more, pulverization, classification, etc. are performed to obtain the average particle It is used after preparing a granular material having a diameter of less than 1 ⁇ m.
- the “average particle size” here is also synonymous with the average particle size of the hygroscopic metal oxide contained in the above-described hygroscopic resin composition layer. *
- the protective resin composition layer used in the present invention further contains an inorganic filler (excluding hygroscopic metal oxides), thereby delaying the moisture transmission rate at the interface between the layer and the EL element side. And the adhesive strength with the substrate can be improved.
- the said inorganic filler can use the same thing as the inorganic filler used for the above-mentioned moisture absorption resin composition layer. From the viewpoint that the inorganic filler is difficult to be exposed at the time of lamination, a filler having a flat plate shape such as talc, clay, mica and boehmite is preferable.
- the upper limit of the content of the inorganic filler is that the viscosity of the resin composition increases, and the strength of the cured product decreases and the non-volatile content in the resin composition layer becomes weak. It is preferably 15% by weight or less, more preferably 10% by weight or less, with respect to 100% by weight.
- the lower limit of the content of the inorganic filler is based on 100% by weight of the nonvolatile content in the resin composition from the viewpoint of obtaining an effect of delaying the moisture transmission rate at the interface between the resin composition layer and the EL element side. 1% by weight or more is preferable, and 3% by weight or more is more preferable.
- the total amount of the inorganic filler and the hygroscopic metal oxide is 15% by weight or less with respect to 100% by weight of the nonvolatile content in the resin composition. Used in.
- the protective resin composition layer used in the present invention further contains rubber particles, the mechanical strength of the cured product can be improved, stress can be relaxed, and the like.
- the moisture-absorbing resin composition layer used in the present invention further includes a thermoplastic resin, thereby imparting flexibility to the cured product and providing good workability when coating the resin composition. Can be granted.
- the moisture-absorbing resin composition layer used in the present invention can further improve the adhesion of the cured product to the adherend and the moisture resistance of the cured product by further containing a coupling agent. .
- the rubber particles, the thermoplastic resin, the coupling agent, and the like can be the same as the rubber particles, the thermoplastic resin, the coupling agent, etc. used in the moisture absorbent resin composition layer described above.
- a silane coupling agent is preferred, and the thermoplastic resin is preferably a phenoxy resin.
- the contents in these thermosetting resin compositions are basically the same as those in the thermosetting resin composition constituting the hygroscopic resin composition layer.
- the protective resin composition layer used in the present invention may optionally contain various additives other than the above-described components within the range where the effects of the present invention are exhibited.
- organic fillers such as silicone powder, nylon powder and fluorine powder, thickeners such as olben and benton, silicone-based, fluorine-based and polymer-based antifoaming or leveling agents, triazole compounds, thiazole compounds , Adhesion imparting agents such as triazine compounds and porphyrin compounds.
- the thickness of the protective resin composition layer used in the present invention is not particularly limited, but the upper limit of the thickness is preferably 40 ⁇ m or less and more preferably 20 ⁇ m or less from the viewpoint of preventing an increase in moisture permeability. On the other hand, the lower limit of the thickness is preferably 1 ⁇ m or more from the viewpoint of making the thickness sufficient to prevent damage to the organic EL element.
- the protective film is preferably protected with a protective film in order to prevent adhesion or scratches of dust or the like to the surface of the resin composition layer.
- a protective film As the plastic film, the plastic film exemplified in the above-mentioned release type support can be used.
- the protective film is preferably subjected to a release treatment in advance, and specific examples of the release agent include a fluorine-based release agent, a silicone-based release agent, and an alkyd resin-based release agent. Different types of release agents may be mixed and used.
- the thickness of the protective film is not particularly limited, but is preferably 1 to 100 ⁇ m, more preferably 10 to 75 ⁇ m, and still more preferably 15 to 50 ⁇ m.
- the film of the present invention is not particularly limited, and can be used for various devices such as semiconductors, solar cells, high-brightness LEDs, LCD seals, organic ELs, and particularly preferably used for sealing organic EL elements. And can be suitably used for an organic EL device. Moreover, when distribute
- the constitutions (1) and (2) of the film of the present invention are the first varnish in which the resin composition constituting the hygroscopic resin composition layer is dissolved and the resin constituting the protective resin composition layer.
- a second varnish in which the composition is dissolved is prepared, and the first varnish is applied to the release system support or the sealing system support, and the organic solvent is dried to form a hygroscopic resin composition layer. It can be obtained by applying the second varnish thereon, drying the organic solvent to form a protective resin composition layer, and further using a protective film.
- the structure of (3) of the film of this invention can be obtained by forming a protective resin composition layer and a moisture absorption resin composition layer reversely.
- the configurations of (4), (5), and (6) of the film of the present invention show the configuration when a protective film is not used in the film production of the configurations of (1), (2), and (3). .
- the relationship between the release system support and the protection film must be such that the protection film is peeled off first. It is preferable to make it thinner or to give a release treatment or embossing to the protective film.
- the release support is preferably a polyethylene terephthalate (PET) film
- the protective film is preferably biaxially oriented polypropylene.
- organic solvent used in the varnish examples include acetone, methyl ethyl ketone (hereinafter abbreviated as “MEK”), ketones such as cyclohexanone, ethyl acetate, butyl acetate, cellosolve acetate, propylene glycol monomethyl ether acetate, carbite.
- ketones such as cyclohexanone, ethyl acetate, butyl acetate, cellosolve acetate, propylene glycol monomethyl ether acetate, carbite.
- acetates such as tall acetate
- carbitols such as cellosolve and butyl carbitol
- aromatic hydrocarbons such as toluene and xylene
- dimethylformamide dimethylacetamide
- N-methylpyrrolidone and the like You may use these 1 type or in combination of 2 or more types.
- the drying conditions are not particularly limited, but 3 to 15 minutes at 50 to 100 ° C. is preferable.
- the hygroscopic resin composition layer and the protective resin composition layer in this order or in the reverse order on the support, the hygroscopic resin composition layer and A mixed layer in which the resin compositions of both layers are mixed is formed at the boundary of the protective resin composition layer, and the damage preventing effect of the organic EL element by the protective resin composition layer may be impaired. Therefore, a first resin composition sheet in which a moisture-absorbing resin composition layer is formed on the first support using the first varnish is produced, and separately from this, the second resin is formed on the second support.
- a second resin composition sheet having a protective resin composition layer formed thereon using the varnish of the first resin composition sheet, and a hygroscopic resin composition layer of the first resin composition sheet and a protective resin composition of the second resin composition sheet A method of laminating physical layers to obtain the film of the present invention is preferred.
- one of the first support and the second support is the support for the film of the present invention, and the other is the protective film for the film of the present invention.
- the melt viscosity of the protective resin composition layer is preferably lower than the melt viscosity of the hygroscopic resin composition layer at the lamination temperature of the hygroscopic resin composition layer and the protective resin composition layer. . That is, at the lamination temperature of the hygroscopic resin composition layer and the protective resin composition layer, the hygroscopic resin composition has a lower melt viscosity than that of the hygroscopic resin composition layer. This is because it is possible to avoid the filler contained in the physical layer from moving to the protective resin composition layer at the time of lamination, and further passing through the protective resin composition layer and damaging the EL element.
- melt viscosity is measured using a model Rheosol-G3000 manufactured by UBM, using a parallel plate having a resin amount of 1 g and a diameter of 18 mm, a measurement start temperature of 60 ° C., and a temperature increase rate of 5 ° C./min. It is a value measured at a temperature of 60 ° C. to 200 ° C. and a frequency of 1 Hz / deg.
- the laminating temperature is not particularly limited and can be appropriately set according to the required performance, but it is required to be lower than the curing temperature of the hygroscopic resin composition layer and the protective resin composition layer. Is preferably 130 ° C. or lower, more preferably 120 ° C. or lower, still more preferably 110 ° C. or lower, and even more preferably 100 ° C. or lower.
- the lower limit of the lamination temperature is preferably 40 ° C. or higher, more preferably 45 ° C. or higher, still more preferably 50 ° C. or higher, even more preferably 55 ° C. or higher, and still more preferably 60 ° C. or higher, from the viewpoint of good handleability at room temperature. Is particularly preferred.
- the lower limit of the difference between the melt viscosity of the hygroscopic resin composition layer and the melt viscosity of the protective resin composition layer is 300 poise or more Is more preferably 1000 poise or more, more preferably 5000 poise or more, still more preferably 10,000 poise or more, still more preferably 15000 poise or more, and most preferably 30000 poise or more.
- the hygroscopic resin composition layer and the protective resin composition layer are efficiently bonded at once, and the hygroscopic resin composition layer and the protective resin composition layer are efficiently bonded together.
- the upper limit of the difference between the melt viscosity of the hygroscopic resin composition layer and the melt viscosity of the protective resin composition layer is preferably 1,000,000 poise or less. 500,000 poise or less is more preferable, and 100,000 poise or less is more preferable.
- the melt viscosity of the protective resin composition layer and the hygroscopic resin composition layer a method of changing the degree of curing depending on drying conditions, a method of changing the blending ratio of the liquid resin, the particle diameter of the inorganic filler, and content The method etc. which change a ratio etc. are mentioned, You may implement these combining 2 or more. Therefore, by these methods, the viscosity of the protective resin composition layer and the hygroscopic resin composition layer is adjusted, and the melt viscosity of the protective resin composition layer at a predetermined temperature is higher than the melt viscosity of the hygroscopic resin composition layer at the predetermined temperature. To be low.
- the film of the present invention can be applied to the formation of a sealing structure for various semiconductor elements (individual semiconductors, optical semiconductors, logic ICs, analog ICs, memories, etc.), and is particularly preferably used for sealing organic EL elements. be able to.
- Organic EL device manufacturing method A method for producing an organic EL device by sealing an organic EL element using the film of the present invention will be described below.
- the protective resin composition layer is disposed so as to cover the element of the element forming substrate, and the hygroscopic resin composition layer is a surface opposite to the surface of the protective resin composition layer on the element forming substrate side. Placed in.
- the structure of the film of the present invention includes the following six aspects as described above.
- the protective film is first removed, and the protective resin composition layer is laminated on the transparent substrate on which the organic EL element is formed. Thereafter, the release support is peeled off, the sealing material is laminated on the exposed moisture absorbent resin composition layer, and the thermosetting operation of the protective resin composition layer and the moisture absorbent resin composition layer is performed to manufacture an organic EL device. can do.
- the protective resin composition layer is laminated on the transparent substrate on which the organic EL element is formed. Thereafter, the release support is peeled off, the sealing material is laminated on the exposed moisture absorbent resin composition layer, and the thermosetting operation of the protective resin composition layer and the moisture absorbent resin composition layer is performed to manufacture an organic EL device. can do.
- the hygroscopic resin composition layer is laminated on the sealing material, and then the release support is peeled off, and the exposed protective resin composition layer is formed into an organic EL element.
- the organic EL device can be manufactured by laminating on the transparent substrate on which the protective resin composition layer and the hygroscopic resin composition layer are thermally cured.
- an organic EL device by the method (b), (c), (e) or (f).
- the sealing material used in the methods (a), (c), (d), and (f) is a material for forming a sealing structure that is prepared separately from the film of the present invention.
- the sealing material include a plastic film having moisture resistance, a metal foil such as a copper foil and an aluminum foil, a glass plate, and a metal plate.
- the upper limit of the thickness of the sealing material is preferably 5 mm or less, more preferably 1 mm or less, and still more preferably 100 ⁇ m or less from the viewpoint of making the organic EL device itself thin and light.
- the lower limit of the thickness of the sealing material is preferably 5 ⁇ m or more, more preferably 10 ⁇ m or more, and further preferably 20 ⁇ m or more from the viewpoint of preventing moisture permeation and the rigidity of the organic EL device.
- Two or more sealing materials may be bonded together, and in that case, the total thickness after bonding is preferably in the range of 5 ⁇ m or more and 5 mm or less.
- the laminating method carried out in the above methods (a) to (f) may be a batch method or a continuous method using a roll.
- Lamination conditions can be carried out under reduced pressure, preferably using a vacuum laminator or the like.
- Lamination is preferably performed under a reduced pressure of 10 ⁇ 3 (10 hPa) MPa or less under conditions of a temperature of 50 to 130 ° C. and a pressure of 0.5 to 10 kgf / cm 2 .
- Specific examples of the vacuum laminator include a vacuum pressurizing laminator manufactured by Meiki Seisakusho, a vacuum applicator manufactured by Nichigo Morton, and the like.
- the method for thermosetting the protective resin composition layer and the hygroscopic resin composition layer is not particularly limited, and known ones can be used. Specific examples include a hot-air circulating oven, an infrared heater, a heat gun, a high-frequency induction heating device, and heating by pressure bonding of a heat tool.
- the film of the present invention has very good low-temperature curability, and the upper limit of the curing temperature is preferably 140 ° C. or lower, more preferably 120 ° C. or lower, and even more preferably 110 ° C. or lower.
- the lower limit of the curing temperature is preferably 50 ° C. or higher, and more preferably 55 ° C. or higher.
- the lower limit of the curing time is preferably 20 minutes or more, and more preferably 30 minutes or more. Thereby, the thermal deterioration of the organic EL element can be extremely reduced.
- the sealing system support or the sealing A transparent material is not necessarily used for the material, and a metal plate, a metal foil, an opaque plastic film, or a plate may be used.
- Latent curing accelerator for epoxy resin manufactured by SANAPRO “ U-CAT3502T ”
- Ionic liquid curing agent (“TBP / N-Ac-gly", N-acetylglycine tetrabutylphosphonium salt)
- TBP / N-Ac-gly N-acetylglycine tetrabutylphosphonium salt
- Hygroscopic metal oxide Firing dolomite MEK slurry (40% by weight as solid content, average particle size: 0.87 ⁇ m) obtained by wet grinding of “light calcined dolomite” manufactured by Yoshizawa Lime
- Inorganic filler-Talc MEK slurry of wet pulverized "D-600” manufactured by Nippon Talc Co., Ltd.
- the base material is peeled off, and a second aluminum foil is laminated on the exposed resin composition layer and laminated under the same conditions, and a test piece having a three-layer structure of aluminum foil, resin composition layer, and aluminum foil. It was created.
- the test piece was heat-cured at 110 ° C. for 30 minutes, then cut into a rectangular test piece having a width of 10 mm and a length of 50 mm, and the length of the test piece was measured in accordance with the T-type peel test method of JIS K-6854. The direction adhesive strength (peeling force) was measured.
- the degree of damage of the organic EL element was evaluated by a dark current value at a driving voltage of 3V. As an evaluation, when the dark current value was less than 0.2 ⁇ A, it was evaluated as ⁇ , and when it was 0.2 ⁇ A or more, it was rated as x.
- curable resin composition varnishes A to E having the composition shown in Table 1 below were prepared.
- the numerical value of the compounding quantity of each material shown in Table 1 is a weight part.
- a mixture A was prepared by dissolving a solid epoxy resin (“HP7200H” manufactured by DIC) in a phenoxy resin (MEK solution of “YL7213-35M” manufactured by Japan Epoxy Resin Co., Ltd. having a solid content of 35% by weight).
- MEK solution of “YL7213-35M” manufactured by Japan Epoxy Resin Co., Ltd. having a solid content of 35% by weight.
- stearic acid was added to and dispersed in MEK slurry (40% by weight as a solid content) of calcined dolomite (wet crushed by Yoshizawa Lime Co., Ltd.) to prepare a mixture B.
- Varnish E was prepared in the same manner as in Varnish B in Production Example 2 according to the recipe shown in Table 1 below.
- Varnish A was uniformly applied on the release treated surface of a PET film (thickness 38 ⁇ m) treated with an alkyd mold release agent with a die coater so that the thickness of the resin composition layer after drying was 10 ⁇ m.
- the protective resin composition layer A1 was obtained by drying at 60 to 95 ° C. for 12 minutes.
- the melt viscosity at 100 ° C. of the protective resin composition layer A1 was 6170 poise.
- Varnish A was uniformly applied on the mold release surface of a PET film (thickness 38 ⁇ m) treated with an alkyd mold release agent with a die coater so that the thickness of the resin composition layer after drying was 10 ⁇ m.
- the protective resin composition layer A2 was obtained by drying at 60 to 80 ° C. for 6 minutes.
- the melt viscosity at 100 ° C. of the protective resin composition layer A2 was 1030 poise.
- the protective resin composition layer with PET film and the hygroscopic resin composition layer with PET film are placed at a temperature of 100 ° C. with a vacuum laminator with the protective resin composition layer and the hygroscopic resin composition layer facing each other.
- a film having a support, a protective resin composition layer, and a hygroscopic resin composition layer (Test Examples 4 to 6) were produced by lamination under conditions of a pressure of 1 kg / cm 2 (9.8 ⁇ 10 4 Pa). . Thereafter, the vicinity of the boundary between the protective resin composition layer and the hygroscopic resin composition layer in the cross section of each produced film was observed with an SEM (scanning electron microscope) (magnification 2000 times). 2 is an SEM photograph of the film section of Test Example 4, FIG. 3 is an SEM photograph of the film section of Test Example 5, and FIG. 4 is an SEM photograph of the film section of Test Example 6.
- melt viscosity of the hygroscopic resin composition layer was 17530 poise for the film of Test Example 4
- the film of Example 5 is 3430 poise and the film of Test Example 6 is -1710 poise.
- the interface between the hygroscopic resin composition layer (upper layer) and the protective resin composition layer (lower layer) is substantially horizontal, and the protective resin composition from the hygroscopic resin composition layer (upper layer). No migration of the hygroscopic metal oxide to the physical layer (lower layer) was observed.
- PEDOT ⁇ PSS is an abbreviation for (poly (3,4-ethylenedioxythiophene)) ⁇ (polystyrenesulfonic acid), and “ ⁇ -NPD” is (bis [N- (1-naphthyl) -N— (Phenyl) benzidine), “Alq 3 ” is an abbreviation for tris (8-quinolinolato) aluminum.
- the film of the present invention was laminated on a glass plate (21 mm ⁇ 28 mm, 0.7 mm thickness) as a sealing material.
- Lamination was performed in a Class 100 clean booth by vacuum pressing at 80 ° C. under reduced pressure (1 ⁇ 10 ⁇ 3 MPa or less) suction for 20 seconds and pressing for 20 seconds.
- the support is peeled off, and the resin composition layer exposed on the glass plate is subjected to reduced pressure (1 ⁇ under a 0.04 MPa load at 80 ° C. in a glove box having an oxygen concentration of 10 ppm or less and a water concentration of 10 ppm or less.
- Vacuum pressing was performed toward the organic EL element forming substrate under the conditions of suction 20 seconds and press 20 seconds. Then, in the glove box, it heated on the 110 degreeC hotplate for 30 minutes, and the film of this invention was thermosetted.
- the resin composition layer is formed by laminating a protective resin composition layer and a hygroscopic resin composition layer. Lamination to a glass plate as a sealing material is performed by pressing the hygroscopic resin composition layer onto a glass plate, For laminating the EL element forming substrate, the protective resin composition layer was pressure-bonded to the organic EL element forming substrate.
- Example 1 Varnish A was uniformly applied on the release treated surface of a PET film (thickness 38 ⁇ m) treated with an alkyd mold release agent with a die coater so that the thickness of the resin composition layer after drying was 10 ⁇ m.
- the protective resin composition layer was obtained by drying at 60 to 95 ° C. for 12 minutes.
- a die coater is used so that the thickness of the resin composition layer after drying becomes 30 ⁇ m.
- a moisture absorbent resin composition layer was obtained.
- the film of the present invention was produced by laminating under conditions of 8 ⁇ 10 4 Pa).
- the protective resin composition layer had a melt viscosity at 80 ° C. of 27500 poise, and the hygroscopic resin composition layer had a melt viscosity at 80 ° C. of 63400 poise.
- the PET film on the moisture absorbent resin composition layer side of the film is peeled off, the moisture absorbent resin composition layer is laminated on a glass plate as a sealing material, and then the PET film on the protective resin composition layer side is peeled off for protection.
- the resin composition layer was laminated on a glass plate having an organic EL element to produce an organic EL device.
- FIG. 1A is a diagram schematically showing a cross section of the produced organic EL device, and a protective resin composition layer (on the formation surface of the organic EL element 4 of the substrate 5 on which the organic EL element 4 is formed).
- Inorganic filler, hygroscopic metal oxide-free) 3, hygroscopic resin composition layer (inorganic filler, hygroscopic metal oxide-containing) 2 and sealing material (glass plate) 1 are laminated in this order.
- Varnish B is uniformly applied by a die coater on the release-treated surface of a PET film (thickness 38 ⁇ m) treated with an alkyd release agent so that the thickness of the resin composition layer after drying is 40 ⁇ m.
- the resin composition layer was obtained by applying and drying at 60 to 95 ° C. for 12 minutes. After laminating this resin composition layer with a PET film on a glass plate as a sealing material, the PET film was peeled off, and the resin composition layer was laminated on a glass plate having an organic EL element to produce an organic EL device. .
- FIG. 1B is a diagram schematically showing a cross section of the produced organic EL device.
- a resin composition layer (inorganic) is formed on the surface of the substrate 5 on which the organic EL element 4 is formed.
- a filler, a hygroscopic metal oxide containing) 2 and a sealing material (glass plate) 1 are laminated in this order.
- Varnish A is uniformly applied by a die coater on the release-treated surface of a PET film (thickness 38 ⁇ m) treated with an alkyd release agent so that the thickness of the resin composition layer after drying is 40 ⁇ m.
- the resin composition layer was obtained by applying and drying at 60 to 95 ° C. for 12 minutes. After laminating this resin composition layer with a PET film on a glass plate as a sealing material, the PET film was peeled off, and the resin composition layer was laminated on a glass plate having an organic EL element to produce an organic EL device. .
- FIG. 1C is a diagram schematically showing a cross section of the produced organic EL device.
- a resin composition layer (inorganic) is formed on the surface of the substrate 5 on which the organic EL element 4 is formed.
- a filler, no hygroscopic metal oxide) 3 and a sealing material (glass plate) 1 are laminated in this order.
- Example 3 A film was produced in the same manner as in Example 1 except that varnish C was used instead of varnish B.
- the PET film on the resin composition layer side derived from varnish C of this film is peeled off, and the resin composition layer is laminated on a glass plate as a sealing material, and then the PET film on the resin composition layer side derived from varnish A is peeled off. And this resin composition layer was laminated on the glass plate which has an organic EL element, and the organic EL device was produced.
- FIG. 1 (d) is a diagram schematically showing a cross section of the produced organic EL device.
- a resin composition layer (inorganic) is formed on the surface of the substrate 5 on which the organic EL element 4 is formed.
- a filler, no hygroscopic metal oxide) 3, a resin composition layer (containing an inorganic filler, no hygroscopic metal oxide) 6 and a sealing material (glass plate) 1 are laminated in this order.
- Varnish C is uniformly applied by a die coater on the release-treated surface of a PET film (thickness 38 ⁇ m) treated with an alkyd release agent so that the thickness of the resin composition layer after drying is 40 ⁇ m.
- the resin composition layer was obtained by applying and drying at 60 to 95 ° C. for 12 minutes. After laminating this resin composition layer with a PET film on a glass plate as a sealing material, the PET film was peeled off, and the resin composition layer was laminated on a glass plate having an organic EL element to produce an organic EL device. .
- FIG. 1 (e) is a diagram schematically showing a cross section of the produced organic EL device.
- a resin composition layer (inorganic) is formed on the surface of the substrate 5 on which the organic EL element 4 is formed.
- Filler-containing, hygroscopic metal oxide-free) 6 and sealing material (glass plate) 1 are laminated in this order.
- Table 4 shows the performance evaluation results for the organic EL devices of Example 1 and Comparative Examples 1 to 4.
- Example 1 From Example 1, by using the film of the present invention, the organic EL element sealing structure that achieves a high level of isolation from the moisture of the organic EL element while reducing damage to the organic EL element can be simplified. It can be seen that it can be formed.
- Example 1 since the hygroscopic resin composition layer and the protective resin composition layer are cured at a low temperature to seal the organic EL element, not only the organic EL element is damaged in the sealing operation but also the organic EL element. The thermal deterioration of was sufficiently suppressed, and a highly reliable organic EL element device could be obtained.
- Comparative Example 1 contained a large amount of hygroscopic metal oxide and damaged the organic EL element.
- Comparative Examples 2, 3, and 4 did not contain a hygroscopic metal oxide, the organic EL element was damaged by moisture.
- the comparative example 4 contained talc, it was difficult to transfer due to the flat filler, and the damage resistance of the device was maintained.
- a film having a support, a protective resin composition layer, and a hygroscopic resin composition layer can realize a film having both moisture permeation resistance and element damage resistance, and such a film provides a highly reliable organic EL device. I can do it now.
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Abstract
Description
(1)支持体と保護樹脂組成物層と吸湿樹脂組成物層とを有することを特徴とする、フィルム。
(2)吸湿樹脂組成物層が、吸湿性金属酸化物を含有することを特徴とする、上記(1)に記載のフィルム。
(3)吸湿樹脂組成物層が、無機充填剤(但し、吸湿性金属酸化物を除く)を含有することを特徴とする、上記(1)または(2)に記載のフィルム。
(4)保護樹脂組成物層が、無機充填剤(但し、吸湿性金属酸化物を除く)を含有することを特徴とする、上記(1)~(3)のいずれかに記載のフィルム。
(5)40℃~130℃の範囲に設定されたラミネート温度において、吸湿樹脂組成物層と保護樹脂組成物層の溶融粘度の差(吸湿樹脂組成物層の溶融粘度-保護樹脂組成物層の溶融粘度)が300ポアズ~100000ポアズであることを特徴とする、上記(1)~(4)のいずれかに記載のフィルム。
(6)上記(1)~(5)のいずれかに記載のフィルムを含有することを特徴とする、有機ELデバイス。
2 吸湿樹脂組成物層(無機充填剤、吸湿性金属酸化物含有)
3 保護樹脂組成物層(無機充填剤、吸湿性金属酸化物非含有)
4 有機EL素子
5 基板
6 樹脂組成物層(無機充填剤含有、吸湿性金属酸化物非含有)
7 吸湿性金属酸化物
本発明に使用される支持体は、「保護樹脂組成物層又は吸湿樹脂組成物層を支持する物質」を意味するが、その機能を発揮しさえすれば、特に制限はない。
支持体は、剥離系支持体と封止系支持体に分類される。
本発明のフィルムに使用される吸湿樹脂組成物層は、熱硬化性樹脂、硬化剤及び吸湿性金属酸化物を含む熱硬化性の樹脂組成物によって構成され、耐透湿性を有する。これにより、目的のデバイス(有機ELデバイス等)の封止構造において、素子(有機EL素子等)への水分浸入を遮断する。
熱硬化性樹脂及び硬化剤は、特に制限はなく、具体的には、エポキシ樹脂、シアネートエステル樹脂、フェノール樹脂、ビスマレイミド-トリアジン樹脂、ポリイミド樹脂、アクリル樹脂、ビニルベンジル樹脂等の種々の熱硬化性樹脂とそれらの硬化剤が挙げられる。なかでも、低温硬化性及び硬化物の接着性等の観点から、エポキシ樹脂とその硬化剤が好ましい。
本発明でいう「吸湿性金属酸化物」とは、水分を吸収する能力をもち、吸湿した水分と化学反応して水酸化物になる金属酸化物のことであり、本発明の目的を達成できれば特に制限はないが、具体的には、酸化カルシウム、酸化マグネシウム、酸化ストロンチウム、酸化アルミニウム及び酸化バリウムから選ばれる1種か、或いは、これらから選ばれる2種以上の金属酸化物の混合物若しくは固溶物である。2種以上の金属酸化物の混合物若しくは固溶物の例としては、具体的には、焼成ドロマイト(酸化カルシウム及び酸化マグネシウムを含む混合物)、焼成ハイドロタルサイト(酸化カルシウムと酸化アルミニウムの固溶物)等が挙げられる。このような吸湿性金属酸化物は、種々の技術分野において吸湿材として公知であり、市販品を使用することができる。具体的には、焼成ドロマイト(吉澤石灰社製「KT」等)、酸化カルシウム(三共製粉社製「モイストップ#10」等)、酸化マグネシウム(協和化学工業社製「キョーワマグMF-150」、「キョーワマグMF-30」、タテホ化学工業社製「ピュアマグFNMG」等)、軽焼酸化マグネシウム(タテホ化学工業社製の「#500」、「#1000」、「#5000」等)等が挙げられる。
吸湿樹脂組成物層を構成する樹脂組成物には、更に無機充填材(但し、吸湿性金属酸化物は除く)を含有させることができる。当該無機充填材を含有することで、樹脂組成物の硬化物の耐透湿性が向上し、また、フィルム作製時の組成物のはじきが防止されて、支持体や封止材料との接着力を向上させることができる。無機充填材としては、具体的には、シリカ、硫酸バリウム、水酸化アルミニウム、水酸化マグネシウム、炭酸カルシウム、炭酸マグネシウム、窒化ホウ素、ホウ酸アルミニウム、チタン酸バリウム、チタン酸ストロンチウム、チタン酸カルシウム、チタン酸マグネシウム、チタン酸ビスマス、酸化チタン、ジルコン酸バリウム、ジルコン酸カルシウム、タルク、クレー、マイカ、ベーマイト、ゼオライト、アパタイト、カオリン、ムライト、スピネル、オリビン、セリサイト、ベントナイトなどが挙げられる。無機充填材は1種又は2種以上を組み合わせて使用してもよい。これらの中でもラミネート時に無機充填材が他層へ移行しにくいという観点から、タルク、クレー、マイカ、ベーマイト等の粒子形態が平板状の充填材が好ましく、さらにかかる粒子形態が平板状の充填材を使用することで、吸湿樹脂組成物層を硬化して得られる硬化層の耐透湿性をより一層高めることができる。
吸湿樹脂組成物層を構成する樹脂組成物には、更にゴム粒子を含有させることができ、ゴム粒子を含有させることにより、樹脂組成物の硬化物の機械強度の向上や応力緩和等を図ることができる。当該ゴム粒子は、樹脂組成物のワニスを調製する際の有機溶媒にも溶解せず、エポキシ樹脂等の樹脂組成物中の成分とも相溶せず、樹脂組成物のワニス中では分散状態で存在するものが好ましい。このようなゴム粒子は、一般には、ゴム成分の分子量を有機溶剤や樹脂に溶解しないレベルまで大きくし、粒子状とすることで調製することができ、具体的には、コアシェル型ゴム粒子、架橋アクリルニトリルブタジエンゴム粒子、架橋スチレンブタジエンゴム粒子、アクリルゴム粒子等が挙げられる。コアシェル型ゴム粒子は、粒子がコア層とシェル層を有するゴム粒子であり、具体的には、外層のシェル層がガラス状ポリマー、内層のコア層がゴム状ポリマーで構成される2層構造、または外層のシェル層がガラス状ポリマー、中間層がゴム状ポリマー、コア層がガラス状ポリマーで構成される3層構造のものなどが挙げられる。ガラス層は具体的には、メタクリル酸メチルの重合物などで構成され、ゴム状ポリマー層は具体的には、ブチルアクリレート重合物(アクリル酸ブチルゴム)などで構成される。これらゴム粒子の一次粒子の平均粒径の上限は、応力緩和の効果を維持することや樹脂組成物により有機EL素子を封止する際の素子へのダメージを防止するという観点から、2μm以下が好ましい。一方、ゴム粒子の一次粒子の平均粒径の下限は、樹脂へ混合する際の粘度上昇によって、取り扱い性が悪化することを防止する観点から、0.05μm以上が好ましい。コアシェル型ゴム粒子の具体例としては、スタフィロイドAC3832、AC3816N(以上、ガンツ化成社製)、メタブレンKW-4426(三菱レイヨン社製)、F351(日本ゼオン社製)等が挙げられる。アクリロニトリルブタジエンゴム(NBR)粒子の具体例としては、XER-91(JSR社製)などが挙げられる。スチレンブタジエンゴム(SBR)粒子の具体例としては、XSK-500(JSR社製)などが挙げられる。アクリルゴム粒子の具体例としては、メタブレンW300A、W450A(以上、三菱レイヨン社製)を挙げることができる。
吸湿樹脂組成物層を構成する樹脂組成物には、更に熱可塑性樹脂を含有させることができる。熱可塑性樹脂を含有させることで、樹脂脂組成物の硬化物に可撓性を付与することがき、また、樹脂組成物をコーティングする際の良好な加工性を付与することができる。当該熱可塑性樹脂としては、具体的には、フェノキシ樹脂、ポリビニルアセタール樹脂、ポリイミド樹脂、ポリアミドイミド樹脂、ポリエーテルスルホン樹脂、ポリスルホン樹脂等を挙げることができる。これらの熱可塑性樹脂はいずれか1種を使用しても2種以上を混合して用いてもよい。熱可塑性樹脂は可撓性の付与、コーティング時のはじき防止の点から、重量平均分子量が10,000以上が好ましく、30,000以上がより好ましい。しかし、重量平均分子量が大きすぎると、エポキシ樹脂との相溶性が低下する等の傾向があることから、重量平均分子量は1,000,000以下であるのが好ましく、800,000以下がより好ましい。
本発明に使用される吸湿樹脂組成物層には、更にカップリング剤を含有させる事により、その硬化物の被着体(支持体、保護樹脂組成物層、封止材料等)との密着性や硬化物の耐透湿性を向上させることができる。当該カップリング剤としては、具体的には、チタン系カップリング剤、アルミニウム系カップリング剤、シランカップリング剤等を挙げることができる。中でも、シランカップリング剤が好ましい。これらは1種または2種以上組み合わせて使用してもよい。
本発明のフィルムに使用される保護樹脂組成物層は、熱硬化性樹脂、硬化剤を含む熱硬化性の樹脂組成物によって構成され、目的のデバイス(有機ELデバイス等)の封止構造において、素子(有機EL素子等)を直接被覆することで、吸湿樹脂組成物層中の吸湿性金属酸化物が素子に接触して素子が損傷するのを防止する役割を有する。
熱硬化性樹脂及び硬化剤は、前述の吸湿樹脂組成物層に使用する熱硬化性樹脂及び硬化剤と同様のものが使用される。保護樹脂組成物層に使用する熱硬化性樹脂及び硬化剤と、吸湿樹脂組成物層に使用する熱硬化性樹脂及び硬化剤は互いに相違するものでもよいが、両層間の密着性、硬化収縮や硬化速度の違いに起因する硬化後の両層間の界面応力を抑える、等の観点から保護樹脂組成物層に使用する熱硬化性樹脂及び硬化剤と、吸湿樹脂組成物層に使用する熱硬化性樹脂及び硬化剤とは同一であるのが好ましい。
本発明に使用される保護樹脂組成物層には、有機EL素子の損傷防止機能を損なわない範囲内で、更に吸湿性金属酸化物を含有させてもよい。吸湿性金属酸化物を含有させることにより、耐透湿性を向上させることができる。
本発明に使用される保護樹脂組成物層には、更に無機充填材(但し、吸湿性金属酸化物は除く)を含有させる事により、層中及びEL素子側との界面の透湿速度を遅延させることができ、基板との接着力を向上させることができる。当該無機充填材には、前述の吸湿樹脂組成物層に使用する無機充填材と同様のものを使用することができる。ラミネート時に無機充填材が露出しにくいという観点から、タルク、クレー、マイカ、ベーマイト等の粒子形態が平板状の充填材が好ましい。なお、無機充填材を使用する場合、無機充填材の含有量の上限は、樹脂組成物の粘度が上昇し、硬化物の強度が低下して脆くなるという観点から、樹脂組成物層中の不揮発分100重量%に対して15重量%以下が好ましく、10重量%以下がより好ましい。一方、無機充填材の含有量の下限は、樹脂組成物層とEL素子側との界面の透湿速度を遅延させる効果を得るという観点から、樹脂組成物中の不揮発分100重量%に対して1重量%以上が好ましく、3重量%以上がより好ましい。なお、無機充填材を吸湿性金属酸化物とともに使用する場合は、無機充填材と吸湿性金属酸化物の合計量が樹脂組成物中の不揮発分100重量%に対して15重量%以下となる範囲内で使用される。
本発明に使用される保護樹脂組成物層には、更にゴム粒子を含有させることにより、その硬化物の機械強度の向上や応力緩和等を行うことができる。また、本発明に使用される吸湿樹脂組成物層には、更に熱可塑性樹脂を含有させることにより、その硬化物へ可撓性を付与し、樹脂組成物をコーティングする際の良好な加工性を付与することができる。また、本発明に使用される吸湿樹脂組成物層には、更にカップリング剤を含有させることにより、その硬化物の被着体との密着性や硬化物の耐透湿性を向上させることができる。当該ゴム粒子、熱可塑性樹脂及びカップリング剤等は、前述の吸湿樹脂組成物層に使用するゴム粒子、熱可塑性樹脂及びカップリング剤等と同様のものを使用することができ、カップリング剤はシランカップリング剤が好ましく、熱可塑性樹脂はフェノキシ樹脂が好ましい。これらの熱硬化性樹脂組成物中の含有量は、基本的に吸湿樹脂組成物層を構成する熱硬化性樹脂組成物におけるそれが踏襲される。
本発明のフィルムは実際に封止構造の形成に使用する前までは、樹脂組成物層表面へのゴミ等の付着やキズを防止するために保護フィルムで保護されているのが好ましく、保護フィルムとしては、前述の剥離系支持体で例示したプラスチックフィルムを用いることができる。保護フィルムは予め離型処理を施しておくのが好ましく、離型剤としては、具体的には、フッ素系離型剤、シリコーン系離型剤、アルキッド樹脂系離型剤等が挙げられる。離型剤は異なる種類のものを混合して用いてもよい。また、保護フィルムの厚さも特に制限されないが、1~100μmが好ましく、10~75μmがより好ましく、15~50μmが更に好ましい。
本発明のフィルムは、特に限定されるものではなく、半導体、太陽電池、高輝度LED、LCDシール、有機EL等の各種デバイスに用いることができ、特に有機EL素子封止用に好適に用いることができ、有機ELデバイスに好適に使用することができる。また、本発明のフィルムを流通させる場合には、保護フィルムを付けて流通させることができる。すなわち、本発明のフィルムの構成は、以下の6つの態様を含む。
(1)剥離系支持体+吸湿樹脂組成物層+保護樹脂組成物層+保護フィルム
(2)封止系支持体+吸湿樹脂組成物層+保護樹脂組成物層+保護フィルム
(3)剥離系支持体+保護樹脂組成物層+吸湿樹脂組成物層+保護フィルム
(4)剥離系支持体+吸湿樹脂組成物層+保護樹脂組成物層
(5)封止系支持体+吸湿樹脂組成物層+保護樹脂組成物層
(6)剥離系支持体+保護樹脂組成物層+吸湿樹脂組成物層
なお、上記は各層の積層順を示している。
本発明のフィルムを用いて有機EL素子を封止し、有機ELデバイスを製造する方法を以下に説明する。デバイスの封止構造において、保護樹脂組成物層は素子形成基板の素子を被覆するように配置され、吸湿樹脂組成物層は保護樹脂組成物層の素子形成基板側の面とは反対側の面に配置される。本発明のフィルムの構成は、前述の通り、以下の6つの態様を含む。
(1)剥離系支持体+吸湿樹脂組成物層+保護樹脂組成物層+保護フィルム
(2)封止系支持体+吸湿樹脂組成物層+保護樹脂組成物層+保護フィルム、
(3)剥離系支持体+保護樹脂組成物層+吸湿樹脂組成物層+保護フィルム、
(4)剥離系支持体+吸湿樹脂組成物層+保護樹脂組成物層
(5)封止系支持体+吸湿樹脂組成物層+保護樹脂組成物層
(6)剥離系支持体+保護樹脂組成物層+吸湿樹脂組成物層
実験に用いた使用材料について説明する。
(A)エポキシ樹脂
・固形エポキシ樹脂(DIC社製「HP7200H」:ジシクロペンタジエン型固形エポキシ樹脂、エポキシ当量(278g/eq))
・ゴム微粒子分散液状エポキシ樹脂(日本触媒社製「BPA328」:一次粒子径が0.3umの2層構造のアクリル樹脂粒子がエポキシ当量185のビスフェノールA型エポキシ樹脂に17重量%含有してなる組成物。エポキシ当量(230g/eq))
・液状エポキシ樹脂(日本化薬社製「GOT」:オルソトルイジンジグリシジルアミン、エポキシ当量(135g/eq))
(B)フェノキシ樹脂
・ジャパンエポキシレジン社製「YL7213-35M」(重量平均分子量35000)の固形分35重量%のMEK溶液
(C)硬化剤
・エポキシ樹脂用潜在性硬化促進剤(サンアプロ社製「U-CAT3502T」)
・イオン液体硬化剤(「TBP/N-Ac-gly」、N-アセチルグリシンテトラブチルホスホニウム塩)
(D)吸湿性金属酸化物
・焼成ドロマイト:吉澤石灰社製「軽焼ドロマイト」を湿式粉砕したもののMEKスラリー(固形分として40重量%、平均粒径:0.87μm)
(E)無機充填材
・タルク:日本タルク社製「D-600」を湿式粉砕したもののMEKスラリー(固形分として30重量%、平均粒径:0.72μm)
(F)表面処理剤
・ステアリン酸
(G)カップリング剤
・シランカップリング剤:信越化学社製「KBM-403」(3-グリシドキシプロピルトリメトキシシラン)
次に、測定方法について説明する。
[支持体と樹脂組成物層間の接着力]
アルミニウム箔(幅50mm、長さ50mm、厚み50μm)を2枚用意し、1枚目のアルミニウム箔の片面に、基材上にある樹脂組成物層(幅40mm、長さ50mm)を重ね合わせて、真空ラミネーターにより、温度80℃、圧力1kgf/cm2(9.8×104Pa)の条件でラミネートした。そして、基材を剥離し、露出した樹脂組成物層上に2枚目のアルミニウム箔を重ねて同じ条件にてラミネートを行い、アルミニウム箔、樹脂組成物層、アルミニウム箔の3層構造の試験片を作成した。この試験片を110℃、30分の条件で加熱硬化後、幅10mm、長さ50mmの矩形の試験片にカットし、JIS K―6854のT型剥離試験方法に準拠して、試験片の長手方向の接着力(剥離力)を測定した。
次に、評価方法について説明する。
[耐透湿性の評価]
有機ELデバイスを60℃/90%RH恒温環境に1000時間曝し、フィルムの耐透湿性を評価した。フィルムの耐透湿性は有機EL素子発光部に生じる発光面積の収縮(シュリンク)及びDS(ダークスポット)の状態から判定し、初期(0時間)と1000時間後の輝度の相対変化率を評価した。すなわち、シュリンクやDSが多く発生すると発光面積が減少して発光部の輝度が増大し、欠陥のない初期状態の輝度に対する相対変化率が大きくなる。また、輝度は定電流駆動(15mA)にて2点測定し、平均値を算出した。評価として、相対変化率が1.1未満である場合は○とし、1.1以上である場合は×とした。
有機EL素子の損傷の度合いを駆動電圧3Vにおける暗電流値にて評価した。評価として、暗電流値が0.2μA未満の場合は○とし、0.2μA以上の場合は×とした。
固形エポキシ樹脂(DIC社製「HP7200H」)をフェノキシ樹脂(ジャパンエポキシレジン社製「YL7213-35M」の固形分35重量%のMEK溶液)に溶解させた混合溶解物を作成し、その混合溶解物に、ゴム微粒子分散液状エポキシ樹脂(日本触媒社製「BPA328」)と、液状エポキシ樹脂(日本化薬社製「GOT」)と、エポキシ樹脂用潜在性硬化促進剤(サンアプロ社製「U-CAT3502T」)と、シランカップリング剤(信越化学社製「KBM-403」)と、イオン液体硬化剤(N-アセチルグリシンテトラブチルホスホニウム塩)と、MEKを添加して高速回転ミキサーで均一に分散して、ワニスAを得た。
固形エポキシ樹脂(DIC社製「HP7200H」)をフェノキシ樹脂(ジャパンエポキシレジン社製「YL7213-35M」の固形分35重量%のMEK溶液)に溶解させた混合物Aを作成した。一方、焼成ドロマイト(吉澤石灰社製を湿式粉砕したもの)のMEKスラリー(固形分として40重量%)にステアリン酸を添加分散し混合物Bを作成した。混合物A、混合物B、タルク(日本タルク社製「D-600」を湿式粉砕したもので、固形分30重量%のMEKスラリー)、ゴム微粒子分散液状エポキシ樹脂(日本触媒社製「BPA328」)と、エポキシ樹脂用潜在性硬化促進剤(サンアプロ社製「U-CAT3502T」)、液状エポキシ樹脂(日本化薬社製「GOT」)、シランカップリング剤(信越化学社製「KBM-403」)を配合し、アジホモミキサーロボミックス型混合攪拌機(プライミクス社製)にて混合した。これにイオン液体硬化剤(N-アセチルグリシンテトラブチルホスホニウム塩)を添加して高速回転ミキサーで均一に分散して、ワニスBを得た。
タルク(日本タルク社製「D-600」を湿式粉砕したもので、固形分30重量%のMEKスラリー)を加えたこと以外は、製造例1でのワニスAと同様の方法により、下記表1の配合表に従い、ワニスCを調製した。
製造例2でのワニスBと同様の方法により、下記表1の配合表に従い、ワニスDを調製した。
製造例2でのワニスBと同様の方法により、下記表1の配合表に従い、ワニスEを調製した。
ワニスB、D、Eにより作製したそれぞれの樹脂組成物層について、支持体との接着力を測定した。結果を表2に示す。
ワニスAをアルキッド系離型剤で処理されたPETフィルム(厚さ38μm)の離型処理面上に、乾燥後の樹脂組成物層の厚さが10μmになるようダイコーターにて均一に塗布し、60~95℃で12分間乾燥させることにより、保護樹脂組成物層A1を得た。保護樹脂組成物層A1の100℃での溶融粘度は6170ポアズであった。
(ITO基板および封止用ガラス板の洗浄)
ITO(インジウム・錫酸化物)基板および封止用ガラス板の洗浄は、それぞれ、クラス10000のクリーンルーム内と、クラス100のクリーンブース内にて行った。洗浄溶剤は半導体洗浄用洗剤および超純水(18MΩ以上、全有機炭素(TOC):10ppb未満)を用い、超音波洗浄機とUV洗浄機を用いた。
真空度が1~2×10-4Pa、蒸着速度が1.0~2.0Å/sにて、30mm角(縦30mm×横30mm)、0.7mm厚のガラス基盤上に、Glass/SiO2[53nm]/ITO[55nm]/PEDOT・PSS[40nm]/α-NPD[50nm]/Alq3[50nm]/LiF[0.8nm]/Al[15nm]の構成にて各層を蒸着し有機EL素子を作製した。発光部面積は10×10mm2である。
なお、「PEDOT・PSS」は、(ポリ(3,4-エチレンジオキシチオフェン))・(ポリスチレンスルホン酸)の略称、「α-NPD」は(ビス[N-(1-ナフチル)-N-フェニル]ベンジジン)の略称、「Alq3」はトリス(8-キノリノラト)アルミニウムの略称である。
まず、本発明のフィルムを封止材料であるガラス板(21mm×28mm、0.7mm厚)にラミネートした。ラミネートはクラス100のクリーンブース内で、80℃、減圧(1×10-3MPa以下)吸引20秒、プレス20秒の条件で真空プレスすることにより行った。
次に、支持体を剥離し、かかるガラス板に露出された樹脂組成物層を、酸素濃度10ppm以下、水分濃度10ppm以下のグローブボックス内で、80℃、0.04MPa荷重下、減圧(1×10-3MPa以下)吸引20秒、プレス20秒の条件で、有機EL素子形成基板に向けて真空プレスした。
その後、グローブボックス内で、110℃のホットプレート上で30分間加熱して本発明のフィルムを熱硬化させた。
なお、上記樹脂組成物層は保護樹脂組成物層と吸湿樹脂組成物層を積層したものであり、封止材料であるガラス板へのラミネートは吸湿樹脂組成物層をガラス板に圧着し、有機EL素子形成基板へのラミネートは保護樹脂組成物層を有機EL素子形成基板に圧着させた。
ワニスAをアルキッド系離型剤で処理されたPETフィルム(厚さ38μm)の離型処理面上に、乾燥後の樹脂組成物層の厚さが10μmになるようダイコーターにて均一に塗布し、60~95℃で12分間乾燥させることにより、保護樹脂組成物層を得た。
ワニスBを、アルキッド系離型剤で処理されたPETフィルム(厚さ38μm)の離型処理面上に、乾燥後の樹脂組成物層の厚さが40μmになるようにダイコーターにて均一に塗布し、60~95℃で12分間乾燥させることにより、樹脂組成物層を得た。このPETフィルム付き樹脂組成物層を封止材料であるガラス板にラミネートした後、PETフィルムを剥離し、樹脂組成物層を有機EL素子を有するガラス板にラミネートして、有機ELデバイスを作製した。
ワニスAを、アルキッド系離型剤で処理されたPETフィルム(厚さ38μm)の離型処理面上に、乾燥後の樹脂組成物層の厚さが40μmになるようにダイコーターにて均一に塗布し、60~95℃で12分間乾燥させることにより、樹脂組成物層を得た。このPETフィルム付き樹脂組成物層を封止材料であるガラス板にラミネートした後、PETフィルムを剥離し、樹脂組成物層を有機EL素子を有するガラス板にラミネートして、有機ELデバイスを作製した。
ワニスBの代わりにワニスCを用いること以外は実施例1と同様にしてフィルムを作製した。このフィルムのワニスC由来の樹脂組成物層側のPETフィルムを剥離し、該樹脂組成物層を封止材料であるガラス板にラミネート後、ワニスA由来の樹脂組成物層側のPETフィルムを剥離し、該樹脂組成物層を有機EL素子を有するガラス板にラミネートして、有機ELデバイスを作製した。
ワニスCを、アルキッド系離型剤で処理されたPETフィルム(厚さ38μm)の離型処理面上に、乾燥後の樹脂組成物層の厚さが40μmになるようにダイコーターにて均一に塗布し、60~95℃で12分間乾燥させることにより、樹脂組成物層を得た。このPETフィルム付き樹脂組成物層を封止材料であるガラス板にラミネートした後、PETフィルムを剥離し、樹脂組成物層を有機EL素子を有するガラス板にラミネートして、有機ELデバイスを作製した。
一方、比較例1は、吸湿性金属酸化物を多く含有しており、有機EL素子を損傷させてしまった。また、比較例2、3、4は、吸湿性金属酸化物を含有していないため、有機EL素子が水分によってダメージを受けてしまった。なお、比較例4は、タルクを含有しているが平板状の充填剤のために移行しにくく、素子の耐損傷性は保持された。
Claims (6)
- 支持体と保護樹脂組成物層と吸湿樹脂組成物層とを有することを特徴とする、フィルム。
- 吸湿樹脂組成物層が、吸湿性金属酸化物を含有することを特徴とする、請求項1記載のフィルム。
- 吸湿樹脂組成物層が、無機充填剤(但し、吸湿性金属酸化物を除く)を含有することを特徴とする、請求項1または2記載のフィルム。
- 保護樹脂組成物層が、無機充填剤(但し、吸湿性金属酸化物を除く)を含有することを特徴とする、請求項1~3のいずれか1項に記載のフィルム。
- 40℃~130℃の範囲に設定されたラミネート温度において、吸湿樹脂組成物層と保護樹脂組成物層の溶融粘度の差(吸湿樹脂組成物層の溶融粘度-保護樹脂組成物層の溶融粘度)が300ポアズ~1000000ポアズであることを特徴とする、請求項1~4のいずれか1項に記載のフィルム。
- 請求項1~5のいずれか1項に記載のフィルムを有することを特徴とする、有機ELデバイス。
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JP6376180B2 (ja) | 2018-08-22 |
KR20120039753A (ko) | 2012-04-25 |
KR102121724B1 (ko) | 2020-06-11 |
TW201639215A (zh) | 2016-11-01 |
JPWO2011016408A1 (ja) | 2013-01-10 |
TWI654783B (zh) | 2019-03-21 |
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