WO2018047920A1 - 接着剤組成物、封止シート、及び封止体 - Google Patents
接着剤組成物、封止シート、及び封止体 Download PDFInfo
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- WO2018047920A1 WO2018047920A1 PCT/JP2017/032360 JP2017032360W WO2018047920A1 WO 2018047920 A1 WO2018047920 A1 WO 2018047920A1 JP 2017032360 W JP2017032360 W JP 2017032360W WO 2018047920 A1 WO2018047920 A1 WO 2018047920A1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J123/00—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
- C09J123/26—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers modified by chemical after-treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/38—Layered products comprising a layer of synthetic resin comprising epoxy resins
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/08—Macromolecular additives
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J163/00—Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/40—Adhesives in the form of films or foils characterised by release liners
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1339—Gaskets; Spacers; Sealing of cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
- H01L31/042—PV modules or arrays of single PV cells
- H01L31/048—Encapsulation of modules
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/724—Permeability to gases, adsorption
- B32B2307/7242—Non-permeable
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/318—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of liquid crystal displays
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Definitions
- the present invention relates to an adhesive composition that is easy to be molded into a sheet and has a low outgassing property, a sealing sheet having a low outgassing adhesive layer formed by using this adhesive composition, and an encapsulant It is related with the sealing body by which a stationary thing is sealed with the said sealing sheet.
- organic EL elements have attracted attention as light-emitting elements that can emit light with high luminance by low-voltage direct current drive.
- the organic EL element has a problem that light emission characteristics such as light emission luminance, light emission efficiency, and light emission uniformity are likely to deteriorate with time.
- As a cause of the problem of the deterioration of the light emission characteristics it has been considered that oxygen, moisture and the like enter the inside of the organic EL element to deteriorate the electrode and the organic layer. For this reason, it has been practiced to seal the organic EL element using a sealing material to prevent the entry of oxygen and moisture.
- when sealing an organic EL element using a sealing material when an outgas generate
- Patent Document 1 describes a sealing composition containing a specific cationic curable compound, a photocationic polymerization initiator, and an azole compound. Patent Document 1 also describes that the cured product of the sealing composition has low outgassing and moisture resistance.
- Patent Document 1 describes that a low outgassing sealing composition can be obtained by using an azole compound as a curing retarder.
- an azole compound as a curing retarder.
- the cause of outgas generation in the sealing material is not only the curing retarder, and therefore further investigation is necessary to obtain a lower outgassing sealing material. I understood.
- the present invention has been made in view of the above circumstances, and is easily formed into a sheet shape and has a low outgassing adhesive composition, and a low outgassing adhesive formed using this adhesive composition. It aims at providing the sealing sheet which has a sealing sheet which has an agent layer, and a to-be-sealed material is sealed with the said sealing sheet.
- an adhesive composition containing a modified polyolefin resin and a polyfunctional epoxy compound is suitable as a material for forming a low-outgas sealing material.
- the present invention has been completed.
- the following adhesive compositions (1) to (9), sealing sheets (10) to (13), and sealing bodies (14) and (15) are provided. .
- component modified polyolefin resin
- component polyfunctional epoxy compound
- the adhesive composition according to (1) or (2), wherein the content of the component (B) is 25 to 200 parts by mass with respect to 100 parts by mass of the component (A).
- Agent composition (10) A sealing sheet comprising two release films and an adhesive layer sandwiched between the release films, wherein the adhesive layer is any one of (1) to (9) A sealing sheet that is formed using an adhesive composition.
- a sealing sheet comprising a release film, a gas barrier film, and an adhesive layer sandwiched between the release film and the gas barrier film, wherein the adhesive layer is any of (1) to (9) A sealing sheet formed using the adhesive composition according to claim 1.
- the sealed body according to (14), wherein the object to be sealed is an organic EL element, an organic EL display element, a liquid crystal display element, or a solar cell element.
- the present invention it is easy to form into a sheet and has a low outgas adhesive composition, a sealing sheet having a low outgas adhesive layer formed using this adhesive composition, and A sealing body is provided in which an object to be sealed is sealed with the sealing sheet.
- low outgassing refers to release even when the solid content of the adhesive composition (or the adhesive layer formed from the adhesive composition) is placed in a high temperature environment. The characteristic of the adhesive composition or adhesive layer that the amount of outgas produced is small.
- Adhesive composition is an adhesive composition containing the following (A) component and (B) component, Comprising: On the conditions for 120 degreeC and 20 minutes about the solid content When the outgas amount is measured, the outgas amount per 1 cm 3 of the solid content is 20 mg or less.
- the modified polyolefin resin is a polyolefin resin having a functional group introduced therein.
- the polyolefin resin is a polymer containing a repeating unit derived from an olefin monomer.
- the polyolefin resin may be a homopolymer consisting of only one type of repeating unit derived from an olefinic monomer or a copolymer consisting of two or more types of repeating units derived from an olefinic monomer.
- a copolymer comprising a repeating unit derived from a monomer and a repeating unit derived from another monomer copolymerizable with the olefin monomer (other monomers other than the olefin monomer) There may be.
- the olefin monomer is preferably an ⁇ -olefin having 2 to 8 carbon atoms, more preferably ethylene, propylene, 1-butene, isobutylene, or 1-hexene, and even more preferably ethylene or propylene.
- Examples of other monomers copolymerizable with the olefin monomer include vinyl acetate, (meth) acrylic acid ester, and styrene.
- (meth) acrylic acid represents the meaning of acrylic acid or methacrylic acid (the same applies hereinafter).
- polyolefin resins examples include very low density polyethylene (VLDPE), low density polyethylene (LDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), linear low density polyethylene, polypropylene (PP), and ethylene-propylene.
- VLDPE very low density polyethylene
- LDPE low density polyethylene
- MDPE medium density polyethylene
- HDPE high density polyethylene
- PP polypropylene
- the modified polyolefin resin can be obtained by subjecting a polyolefin resin as a precursor to a modification treatment using a modifier.
- the modifier used for the modification treatment of the polyolefin resin is a compound having a functional group in the molecule, that is, a group that can contribute to a crosslinking reaction described later.
- Functional groups include carboxyl groups, carboxylic anhydride groups, carboxylic ester groups, hydroxyl groups, epoxy groups, amide groups, ammonium groups, nitrile groups, amino groups, imide groups, isocyanate groups, acetyl groups, thiol groups, ether groups.
- a carboxyl group, a carboxylic anhydride group, a carboxylic ester group, a hydroxyl group, an ammonium group, an amino group, an imide group, and an isocyanate group are preferable, a carboxylic anhydride group and an alkoxysilyl group are more preferable, and a carboxylic anhydride Physical groups are particularly preferred.
- the compound having a functional group may have two or more kinds of functional groups in the molecule.
- modified polyolefin resins include acid-modified polyolefin resins and silane-modified polyolefin resins. Among these, an acid-modified polyolefin resin is preferable from the viewpoint of obtaining the superior effect of the present invention.
- the acid-modified polyolefin resin is a resin obtained by graft-modifying a polyolefin resin with an acid.
- a polyolefin resin may be reacted with an unsaturated carboxylic acid to introduce a carboxyl group (graft modification).
- the unsaturated carboxylic acid includes the concept of carboxylic anhydride
- the carboxyl group includes the concept of carboxylic anhydride group.
- Examples of the unsaturated carboxylic acid to be reacted with the polyolefin resin include maleic acid, fumaric acid, itaconic acid, citraconic acid, glutaconic acid, tetrahydrophthalic acid, aconitic acid, maleic anhydride, itaconic anhydride, glutaconic anhydride, citraconic anhydride, Examples thereof include aconitic anhydride, norbornene dicarboxylic acid anhydride, and tetrahydrophthalic acid anhydride. These can be used alone or in combination of two or more. Among these, maleic anhydride is preferable because an adhesive composition having better adhesive strength can be easily obtained.
- the amount of the unsaturated carboxylic acid reacted with the polyolefin resin is preferably 0.1 to 5 parts by mass, more preferably 0.2 to 3 parts by mass, and further preferably 0.2 to 3 parts by mass with respect to 100 parts by mass of the polyolefin resin. 1.0 part by mass.
- the adhesive composition containing the acid-modified polyolefin resin thus obtained is more excellent in adhesive strength.
- a commercially available product may be used as the acid-modified polyolefin resin.
- commercially available products include Admer (registered trademark) (manufactured by Mitsui Chemicals), Unistor (registered trademark) (manufactured by Mitsui Chemicals), BondyRam (manufactured by Polyram), orevac (registered trademark) (manufactured by ARKEMA), Modic (registered trademark) (manufactured by Mitsubishi Chemical Corporation) and the like.
- Silane-modified polyolefin resin refers to a polyolefin resin graft-modified with an unsaturated silane compound.
- the silane-modified polyolefin resin has a structure in which an unsaturated silane compound is graft copolymerized with a polyolefin resin as a main chain.
- examples of the silane-modified polyolefin resin include, but are not limited to, silane-modified polyethylene resin and silane-modified ethylene-vinyl acetate copolymer. Of these, silane-modified polyethylene resins such as silane-modified low-density polyethylene, silane-modified ultra-low-density polyethylene, and silane-modified linear low-density polyethylene are preferable.
- a vinyl silane compound As the unsaturated silane compound to be reacted with the polyolefin resin, a vinyl silane compound is preferable.
- Vinyl silane compounds include vinyl trimethoxy silane, vinyl triethoxy silane, vinyl tripropoxy silane, vinyl triisopropoxy silane, vinyl tributoxy silane, vinyl tripentyloxy silane, vinyl triphenoxy silane, vinyl tribenzyloxy silane, vinyl tri Examples include methylenedioxysilane, vinyltriethylenedioxysilane, vinylpropionyloxysilane, vinyltriacetoxysilane, and vinyltricarboxysilane. These can be used individually by 1 type or in combination of 2 or more types.
- a known conventional method of graft polymerization may be employed.
- the amount of the unsaturated silane compound to be reacted with the polyolefin resin is preferably 0.1 to 10 parts by mass, particularly preferably 0.3 to 7 parts by mass, with respect to 100 parts by mass of the polyolefin resin. Is preferably 0.5 to 5 parts by mass.
- the adhesive composition containing the resulting silane-modified polyolefin resin is more excellent in adhesive strength.
- a commercially available product may be used as the silane-modified polyolefin resin.
- Commercially available products include, for example, Linklon (registered trademark) (manufactured by Mitsubishi Chemical Corporation), among others, low density polyethylene-based linklon, linear low-density polyethylene-based linkron, and ultra-low-density polyethylene-based.
- Linklon registered trademark
- Rincron of ethylene-vinyl acetate copolymer system can be preferably used.
- the modified polyolefin resin can be used singly or in combination of two or more.
- the number average molecular weight (Mn) of the modified polyolefin-based resin is not particularly limited, but is preferably 10,000 to 2,000,000, more preferably 20,000 to 1,500,000, from the viewpoint of obtaining the better effect of the present invention. More preferably, it is 000.
- the number average molecular weight (Mn) of the modified polyolefin resin can be obtained as a standard polystyrene equivalent value by performing gel permeation chromatography using tetrahydrofuran as a solvent.
- the content of the modified polyolefin resin is not particularly limited, but from the viewpoint of obtaining the better effect of the present invention, the total amount of the modified polyolefin resin and the following component (B) determines the solid content of the adhesive composition. As a reference, 30% by mass or more is preferable, and 50% by mass or more is more preferable.
- (B) component Multifunctional epoxy compound
- the adhesive composition of this invention contains a polyfunctional epoxy compound as (B) component. Since the adhesive composition of the present invention contains a polyfunctional epoxy compound, the cured product has excellent water vapor barrier properties.
- the polyfunctional epoxy compound means a compound having at least two epoxy groups in the molecule.
- epoxy compounds having two or more epoxy groups include bisphenol A diglycidyl ether, bisphenol F diglycidyl ether, bisphenol S diglycidyl ether, brominated bisphenol A diglycidyl ether, brominated bisphenol F diglycidyl ether, and brominated bisphenol S.
- Diglycidyl ether novolac type epoxy resin (for example, phenol novolac type epoxy resin, cresol novolac type epoxy resin, brominated phenol novolac type epoxy resin), hydrogenated bisphenol A diglycidyl ether, hydrogenated bisphenol F diglycidyl ether, Hydrogenated bisphenol S diglycidyl ether, pentaerythritol polyglycidyl ether, 1,6-hexanediol diglycidyl ether, Oxahydrophthalic acid diglycidyl ester, neopentyl glycol diglycidyl ether, trimethylolpropane polyglycidyl ether, 2,2-bis (3-glycidyl-4-glycidyloxyphenyl) propane, dimethylol tricyclodecane diglycidyl ether, etc. Can be mentioned.
- These polyfunctional epoxy compounds can be used individually by 1 type or in combination of 2 or more types.
- the lower limit of the weight average molecular weight of the polyfunctional epoxy compound is preferably 1,000, more preferably 1,200.
- the upper limit of the weight average molecular weight of the polyfunctional epoxy compound is preferably 5,000, more preferably 4,500.
- an adhesive composition having a polyfunctional epoxy compound having a weight average molecular weight of 1,000 or more a lower outgassing sealing material can be formed.
- the adhesive composition having a polyfunctional epoxy compound having a weight average molecular weight of 5,000 or less is excellent in fluidity, and can sufficiently fill the unevenness caused by the unevenness of the surface of the object to be sealed and the thickness of the object to be sealed ( Excellent ruggedness followability).
- the epoxy equivalent of the polyfunctional epoxy compound is preferably 100 g / eq or more and 500 g / eq or less, more preferably 150 g / eq or more and 300 g / eq or less.
- the content of the polyfunctional epoxy compound in the adhesive composition of the present invention is preferably 25 to 200 parts by mass, more preferably 50 to 150 parts by mass with respect to 100 parts by mass of the component (A). Hardened
- the adhesive composition of this invention may contain components other than the said (A) component and (B) component.
- components other than (A) component and (B) component the following (C) component, (D) component, and (E) component are mentioned.
- Component Imidazole-based curing catalyst
- E) component Silane coupling agent
- Component (C) Tackifier having a softening point of 80 ° C. or higher
- the adhesive composition containing the component (B) has a low storage elastic modulus before curing and is excellent in unevenness followability.
- such an adhesive composition may be difficult to maintain a certain shape and difficult to be formed into a sheet shape. In such a case, the moldability can be improved by containing the component (C).
- tackifiers include rosin resins such as polymerized rosin, polymerized rosin ester, and rosin derivatives; terpene resins such as polyterpene resins, aromatic modified terpene resins and hydrides thereof, and terpene phenol resins; coumarone and indene resins; aliphatic Petroleum resins such as petroleum resins, aromatic petroleum resins and their hydrides, aliphatic / aromatic copolymer petroleum resins; low molecular weight polymers of styrene or substituted styrene; ⁇ -methylstyrene monopolymer resins, ⁇ -Methylstyrene / styrene copolymer resin, styrene monomer / aliphatic monomer copolymer resin, styrene monomer / ⁇ -methylstyrene / aliphatic monomer copolymer resin, styrene monomer
- a styrene resin is preferable, and a styrene monomer / aliphatic monomer copolymer resin is more preferable.
- These tackifiers can be used singly or in combination of two or more.
- the softening point of the tackifier is 80 ° C or higher.
- the adhesive composition which is excellent in the adhesiveness at the time of high temperature is obtained because the softening point of a tackifier is 80 degreeC or more.
- molding an adhesive composition in a sheet form improves.
- the adhesive composition of the present invention contains a tackifier having a softening point of 80 ° C. or higher
- the content thereof is preferably 1 to 200 parts by mass with respect to 100 parts by mass of the component (A).
- the amount is preferably 10 to 150 parts by mass. If there are too few tackifiers having a softening point of 80 ° C. or higher, it may be difficult to form the adhesive composition into a sheet. On the other hand, when there are too many tackifiers whose softening point is 80 degreeC or more, there exists a possibility that an adhesive bond layer may become weak.
- Imidazole-based curing catalyst is a compound having an imidazole skeleton, and has an action of catalyzing the curing reaction of the adhesive composition.
- Examples of imidazole-based curing catalysts include 2-methylimidazole, 2-phenylimidazole, 2-undecylimidazole, 2-heptadecylimidazole, 2-ethyl-4-methylimidazole, 2-phenyl-4-methylimidazole, 2-phenyl Examples include -4-methyl-5-hydroxymethylimidazole, 2-phenyl-4,5-dihydroxymethylimidazole, and the like. Of these, 2-ethyl-4-methylimidazole is preferred.
- These imidazole-based curing catalysts can be used singly or in combination of two or more.
- the content thereof is preferably 0.1 to 10 parts by mass, more preferably 0.2 parts per 100 parts by mass of the component (A). Is 5 parts by mass.
- the cured product of the adhesive composition having an imidazole-based curing catalyst content within this range has excellent adhesiveness even at high temperatures.
- silane coupling agent is an organosilicon compound having simultaneously a functional group reactively bonded to an organic material and a functional group reactively bonded to an inorganic material (hydrolyzable group) in the molecule.
- silane coupling agent a known silane coupling agent can be used, and among them, an organosilicon compound having at least one alkoxysilyl group in the molecule is preferable.
- silane coupling agent examples include polymerizable unsaturated group-containing silicon compounds such as vinyltrimethoxysilane, vinyltriethoxysilane, and methacryloxypropyltrimethoxysilane; 3-glycidoxypropyltrimethoxysilane, 2- (3,4 -Epoxycyclohexyl) silicon compounds having an epoxy structure such as ethyltrimethoxysilane; 3-aminopropyltrimethoxysilane, N- (2-aminoethyl) -3-aminopropyltrimethoxysilane, N- (2-aminoethyl) And amino group-containing silicon compounds such as -3-aminopropylmethyldimethoxysilane; 3-chloropropyltrimethoxysilane; 3-isocyanatopropyltriethoxysilane; and the like.
- silane coupling agents can be used alone or in combination of two or more.
- an adhesive composition containing a silane coupling agent By using an adhesive composition containing a silane coupling agent, it becomes easy to obtain a cured product having better adhesive strength in a normal temperature (15 ° C. to 30 ° C.) and high temperature (40 ° C. to 100 ° C.) environment.
- the adhesive composition of the present invention contains a silane coupling agent
- the content is preferably based on 100 parts by mass of the component (A) from the viewpoint of obtaining a cured product having further excellent adhesive strength. 0.01 to 10 parts by mass, more preferably 0.02 to 5 parts by mass.
- the adhesive composition of the present invention may contain a solvent.
- Solvents include aromatic hydrocarbon solvents such as benzene and toluene; ester solvents such as ethyl acetate and butyl acetate; ketone solvents such as acetone, methyl ethyl ketone, and methyl isobutyl ketone; n-pentane, n-hexane, n- And aliphatic hydrocarbon solvents such as heptane; alicyclic hydrocarbon solvents such as cyclopentane, cyclohexane, and methylcyclohexane; These solvents can be used alone or in combination of two or more. The content of the solvent can be appropriately determined in consideration of coating properties and the like.
- the adhesive composition of the present invention may contain other components as long as the effects of the present invention are not hindered.
- other components include additives such as ultraviolet absorbers, antistatic agents, light stabilizers, antioxidants, resin stabilizers, fillers, pigments, extenders and softeners. These can be used alone or in combination of two or more. When the adhesive composition of this invention contains these additives, the content can be suitably determined according to the objective.
- the adhesive composition of the present invention can be prepared by appropriately mixing and stirring predetermined components according to a conventional method.
- the adhesive composition of the present invention is 20mg or less, preferably 18 mg, 15 mg or less Is more preferably 10 mg or less, and most preferably 8 mg or less. Although there is no lower limit in particular, it is usually 0.1 mg or more.
- solid content means the solid part remove
- the amount of outgas for the solid content of the adhesive composition is, for example, a film with a sheet-like adhesive obtained by coating the adhesive composition of the present invention on a base film (or a release film) and drying it. Using as a test piece, it can be measured according to the method described in Examples.
- An adhesive composition with a small amount of outgas can be obtained efficiently by using a relatively high molecular weight polyfunctional epoxy compound.
- the adhesive composition of the present invention is easily formed into a sheet and has low outgassing properties. For this reason, the adhesive composition of this invention is used suitably when forming a sealing material.
- sealing sheet of this invention is the following sealing sheet ((alpha)) or sealing sheet ((beta)).
- Sealing sheet ( ⁇ ) a sealing sheet comprising two release films and an adhesive layer sandwiched between these release films, wherein the adhesive layer uses the adhesive composition of the present invention.
- sealing sheet ( ⁇ ) The release film constituting the sealing sheet ( ⁇ ) functions as a support in the manufacturing process of the sealing sheet ( ⁇ ) and protects the adhesive layer until the sealing sheet ( ⁇ ) is used. Functions as a sheet.
- a conventionally well-known thing can be utilized as a peeling film.
- the substrate for the release film paper substrates such as glassine paper, coated paper, and high-quality paper; laminated paper obtained by laminating a thermoplastic resin such as polyethylene on these paper substrates; polyethylene terephthalate resin, polybutylene terephthalate resin, Examples thereof include plastic films such as polyethylene naphthalate resin, polypropylene resin, and polyethylene resin.
- the release agent include rubber elastomers such as silicone resins, olefin resins, isoprene resins, and butadiene resins, long chain alkyl resins, alkyd resins, and fluorine resins.
- the two release films in the sealing sheet ( ⁇ ) may be the same or different, but the two release films preferably have different release forces. By making the peeling force of two peeling films different, the process of peeling a peeling film initially can be performed more efficiently.
- the thickness of the adhesive layer of the sealing sheet ( ⁇ ) is not particularly limited, but is preferably 5 to 25 ⁇ m, and more preferably 10 to 20 ⁇ m.
- the adhesive layer is very thin, since this adhesive layer is formed by the adhesive composition of the present invention, it is excellent in uneven follow-up and sufficiently adheres to the unevenness of the adherend. Can be filled.
- the adhesive layer of the sealing sheet ( ⁇ ) preferably has thermosetting properties.
- the adhesive layer having thermosetting property is extremely excellent in adhesive strength after curing.
- the conditions for thermosetting the adhesive layer are not particularly limited.
- the heating temperature is usually 80 to 200 ° C, preferably 90 to 150 ° C.
- the heating time is usually 30 minutes to 12 hours, preferably 1 to 6 hours.
- the peel adhesive strength at 23 ° C. of the adhesive layer after the curing treatment is usually 1 to 100 N / 25 mm, preferably 10 to 50 N / 25 mm, and the peel adhesive strength at 85 ° C. is usually 1 to 100 N. / 25 mm, preferably 5 to 50 N / 25 mm.
- the peel adhesive strength is measured according to the method described in the examples.
- the water vapor permeability of the adhesive layer after the curing treatment is usually 0.1 to 200 g / m 2 / day, preferably 1 to 150 g / m 2 / day.
- the manufacturing method of the sealing sheet ( ⁇ ) is not particularly limited.
- a sealing sheet ((alpha)) can be manufactured using a well-known casting method. More specifically, by using a known method, the adhesive composition of the present invention is applied to the release-treated surface of the release film, and the resulting coating film is dried to form an adhesive layer with a release film.
- the sealing sheet ((alpha)) can be obtained by manufacturing and then stacking another release film on the adhesive layer.
- Examples of the method for applying the adhesive composition include spin coating, spray coating, bar coating, knife coating, roll coating, blade coating, die coating, and gravure coating.
- the drying conditions for drying the coating film are not particularly limited.
- the drying temperature is 80 to 150 ° C.
- the drying time is 30 seconds to 5 minutes.
- sealing sheet ( ⁇ ) Examples of the release film and the adhesive layer constituting the sealing sheet ( ⁇ ) are the same as those shown as the release film and the adhesive layer constituting the sealing sheet ( ⁇ ).
- the gas barrier film which comprises a sealing sheet ((beta)) will not be specifically limited if it is a film which has a moisture barrier property.
- the gas barrier film preferably has a water vapor transmission rate of 0.1 g / m 2 / day or less in an environment of a temperature of 40 ° C. and a relative humidity of 90% (hereinafter abbreviated as “90% RH”). It is more preferable that it is 0.05 g / m 2 / day or less, and it is more preferable that it is 0.005 g / m 2 / day or less.
- the gas barrier film has a water vapor permeability of 0.1 g / m 2 / day or less in an environment of 40 ° C. and 90% RH, so that oxygen or oxygen can be contained inside the organic EL element or the like formed on the transparent substrate. It is possible to effectively suppress the penetration of moisture and the like and the deterioration of the electrode and the organic layer.
- the transmittance of water vapor and the like of the gas barrier film can be measured using a known gas permeability measuring device.
- gas barrier film examples include metal foil, resin film, and thin glass. Among these, a resin film is preferable, and a gas barrier film having a base material and a gas barrier layer is more preferable.
- metal of the metal foil examples include metal materials such as copper, nickel, and aluminum; alloy materials such as stainless steel and aluminum alloys;
- the components and composition of the thin film glass are not particularly limited, but alkali-free borosilicate glass is preferable in terms of obtaining more stable flexibility.
- the thin film glass may be used as a simple substance, or a metal foil such as an aluminum foil or a resin film laminated or laminated on the thin film glass may be used. Further, as the thin film glass, those having a flexibility of about 10 to 200 ⁇ m in thickness are preferable.
- Examples of the resin component constituting the base material of the gas barrier film include polyimide, polyamide, polyamideimide, polyphenylene ether, polyether ketone, polyether ether ketone, polyolefin, polyester, polycarbonate, polysulfone, polyether sulfone, polyphenylene sulfide, and polyphenylene sulfide.
- Examples include arylate, acrylic resin, cycloolefin polymer, aromatic polymer, polyurethane polymer, and the like.
- the thickness of the substrate is not particularly limited, but is preferably 0.5 to 500 ⁇ m, more preferably 1 to 200 ⁇ m, and further preferably 5 to 100 ⁇ m from the viewpoint of ease of handling.
- the material and the like of the gas barrier layer are not particularly limited as long as desired gas barrier properties can be imparted.
- the gas barrier layer include an inorganic film and a layer obtained by subjecting a layer containing a polymer compound to a modification treatment.
- the gas barrier layer includes a gas barrier layer made of an inorganic film and a gas barrier layer obtained by subjecting a layer containing a polymer compound to a modification treatment. preferable.
- the inorganic film is not particularly limited, and examples thereof include an inorganic vapor deposition film.
- the inorganic vapor deposition film include vapor deposition films of inorganic compounds and metals.
- the raw material for the vapor-deposited film of the inorganic compound inorganic oxides such as silicon oxide, aluminum oxide, magnesium oxide, zinc oxide, indium oxide and tin oxide; inorganic nitrides such as silicon nitride, aluminum nitride and titanium nitride; inorganic carbides; Inorganic sulfides; inorganic oxynitrides such as silicon oxynitride; inorganic oxide carbides; inorganic nitride carbides; inorganic oxynitride carbides and the like.
- the raw material for the metal vapor deposition film include aluminum, magnesium, zinc, and tin. It is done.
- Examples of the method for forming the inorganic film include a vacuum deposition method, an EB deposition method, a sputtering method, an ion plating method, a lamination method, a plasma vapor deposition method (CVD method), and the like.
- the thickness of the inorganic film is appropriately selected depending on the type and configuration of the inorganic material, but is usually 1 to 500, and preferably 2 to 300 nm.
- the polymer compound used is a silicon-containing polymer such as polyorganosiloxane or polysilazane compound.
- a silicon-containing polymer such as polyorganosiloxane or polysilazane compound.
- These polymer compounds can be used alone or in combination of two or more.
- silicon-containing polymer compounds are preferable, and polysilazane compounds are more preferable.
- the polysilazane compound is a polymer compound having a repeating unit containing —Si—N— bond (silazane bond) in the molecule. Specifically, the formula (1)
- the compound which has a repeating unit represented by these is preferable.
- the number average molecular weight of the polysilazane compound to be used is not particularly limited, but is preferably 100 to 50,000.
- n represents arbitrary natural numbers.
- Rx, Ry, and Rz each independently represent a hydrogen atom, an unsubstituted or substituted alkyl group, an unsubstituted or substituted cycloalkyl group, an unsubstituted or substituted alkenyl group, unsubstituted or substituted Represents a non-hydrolyzable group such as an aryl group having a group or an alkylsilyl group;
- Rx, Ry, and Rz a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or a phenyl group is preferable, and a hydrogen atom is particularly preferable.
- Examples of the polysilazane compound having a repeating unit represented by the formula (1) include inorganic polysilazanes in which Rx, Ry, and Rz are all hydrogen atoms, and organic polysilazanes in which at least one of Rx, Ry, and Rz is not a hydrogen atom. It may be.
- Polysilazane compounds can be used singly or in combination of two or more.
- a modified polysilazane compound can also be used as the polysilazane compound.
- a commercially available product as a glass coating material or the like can be used as it is.
- the polymer layer may contain other components in addition to the above-described polymer compound as long as the object of the present invention is not impaired.
- other components include curing agents, other polymers, anti-aging agents, light stabilizers, and flame retardants.
- the content of the polymer compound in the polymer layer is preferably 50% by mass or more and more preferably 70% by mass or more because a gas barrier layer having better gas barrier properties can be obtained.
- the thickness of the polymer layer is not particularly limited, but is preferably in the range of 50 to 300 nm, more preferably 50 to 200 nm. In the present invention, a sealing sheet having a sufficient gas barrier property can be obtained even if the thickness of the polymer layer is nano-order.
- a layer forming solution containing at least one polymer compound, optionally other components, a solvent, and the like is used as a known method such as a spin coater, a knife coater, a gravure coater, or the like.
- a method in which an apparatus is used for coating and the resulting coating film is appropriately dried to form is used as a known method.
- Examples of the polymer layer modification treatment include ion implantation treatment, plasma treatment, radiation irradiation treatment, heat treatment and the like, and treatment for changing the bonding structure of the polymer layer is preferable. These processes can be performed alone or in combination of two or more.
- the ion implantation process is a method of modifying the polymer layer by implanting ions into the polymer layer, as will be described later.
- the plasma treatment is a method for modifying the polymer layer by exposing the polymer layer to plasma.
- plasma treatment can be performed according to the method described in Japanese Patent Application Laid-Open No. 2012-106421.
- the radiation irradiation treatment is a method for modifying the polymer layer by irradiating the polymer layer with radiation.
- the radiation preferably has a short wavelength with a high effect of changing the bonding structure of the polymer layer, and it is preferable to use ultraviolet rays, particularly vacuum ultraviolet rays.
- the vacuum ultraviolet light modification treatment can be performed according to the method described in JP2013-226757A.
- the ion implantation treatment is preferable because the gas barrier layer can be efficiently modified to the inside without roughening the surface of the polymer layer and more excellent in gas barrier properties.
- ions implanted into the polymer layer ions of rare gases such as argon, helium, neon, krypton, and xenon; ions such as fluorocarbon, hydrogen, nitrogen, oxygen, carbon dioxide, chlorine, fluorine, and sulfur; Ions of alkane gases such as methane and ethane; Ions of alkene gases such as ethylene and propylene; Ions of alkadiene gases such as pentadiene and butadiene; Ions of alkyne gases such as acetylene; Benzene, toluene, etc.
- rare gases such as argon, helium, neon, krypton, and xenon
- ions such as fluorocarbon, hydrogen, nitrogen, oxygen, carbon dioxide, chlorine, fluorine, and sulfur ions of alkane gases such as methane and ethane
- Ions of alkene gases such as ethylene and propylene
- Ions of alkadiene gases such
- Ions of aromatic hydrocarbon gases such as: ions of cycloalkane gases such as cyclopropane; ions of cycloalkene gases such as cyclopentene; ions of metals; ions of organosilicon compounds; These ions can be used alone or in combination of two or more.
- ions of rare gases such as argon, helium, neon, krypton, and xenon are preferable because ions can be more easily implanted and a gas barrier layer having particularly excellent gas barrier properties can be obtained.
- the method for implanting ions is not particularly limited. For example, there are a method of irradiating ions accelerated by an electric field (ion beam), a method of injecting ions in plasma (ion of plasma generation gas), etc., and a gas barrier layer can be easily obtained.
- a method of implanting ions is preferred.
- plasma is generated in an atmosphere containing a plasma generation gas, and a negative high voltage pulse is applied to a layer into which ions are implanted, whereby ions (positive ions) in the plasma are ionized. Can be performed by injecting into the surface of the layer to be injected.
- the manufacturing method of a sealing sheet ((beta)) is not specifically limited.
- the sealing sheet ( ⁇ ) can be manufactured by replacing one of the release films with a gas barrier film.
- the sealing sheet ((beta)) is manufactured by peeling the one peeling film and sticking the exposed adhesive bond layer and a gas-barrier film. You can also.
- the sealing sheet ( ⁇ ) has two release films having different release forces, it is preferable to release the release film having the smaller release force from the viewpoint of handleability.
- the adhesive layer of the sealing sheet of the present invention has low outgassing properties. For this reason, when an organic EL element is sealed, the deterioration can be suppressed.
- the sealing body of the present invention is formed by sealing an object to be sealed with the sealing sheet of the present invention.
- the sealing body of the present invention includes, for example, a transparent substrate, an element (an object to be sealed) formed on the transparent substrate, and a sealing material for sealing the element.
- the sealing material is an adhesive layer of the sealing sheet of the present invention.
- the transparent substrate is not particularly limited, and various substrate materials can be used. In particular, it is preferable to use a substrate material having a high visible light transmittance. In addition, a material having a high blocking performance for blocking moisture and gas to enter from the outside of the element and having excellent solvent resistance and weather resistance is preferable.
- transparent inorganic materials such as quartz and glass; polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polystyrene, polyethylene, polypropylene, polyphenylene sulfide, polyvinylidene fluoride, acetyl cellulose, brominated phenoxy, aramids, polyimides, Examples thereof include transparent plastics such as polystyrenes, polyarylates, polysulfones, and polyolefins, and the gas barrier film described above.
- the thickness of the transparent substrate is not particularly limited, and can be appropriately selected in consideration of light transmittance and performance for blocking the inside and outside of the element.
- Examples of the objects to be sealed include organic EL elements, organic EL display elements, liquid crystal display elements, solar cell elements, and the like.
- the manufacturing method of the sealing body of this invention is not specifically limited. For example, after the adhesive layer of the sealing sheet of the present invention is stacked on the object to be sealed, the adhesive layer of the sealing sheet and the object to be sealed are bonded by heating. Subsequently, the sealing body of this invention can be manufactured by hardening this adhesive bond layer.
- the bonding temperature is, for example, 23 to 100 ° C., preferably 40 to 80 ° C. This adhesion treatment may be performed while applying pressure.
- the curing conditions for curing the adhesive layer the conditions described above can be used.
- the sealing body of the present invention is formed by sealing an object to be sealed with the sealing sheet of the present invention. Therefore, in the sealed body of the present invention, the performance of the object to be sealed is maintained for a long time.
- the weight average molecular weight (Mw) of the modified polyolefin resin and the polyfunctional epoxy compound is a value measured by the following method. ⁇ Weight average molecular weight of modified polyolefin resin (Mw)> The weight average molecular weight (Mw) of the modified polyolefin resin was measured using a gel permeation chromatograph (GPC) apparatus (product name “HLC-8320” manufactured by Tosoh Corporation) under the following conditions. The value converted into the weight average molecular weight was used.
- GPC gel permeation chromatograph
- Acid-modified polyolefin resin ( ⁇ -olefin polymer, manufactured by Mitsui Chemicals, trade name: Unistor H-200, weight average molecular weight: 52,000), 100 parts of polyfunctional epoxy compound (1) (bisphenol A diglycidyl ether) , Manufactured by Mitsubishi Chemical Corporation, trade name: YL980, epoxy equivalent 180-190 g / eq, molecular weight: 2,400, 100 parts, tackifier (styrene monomer aliphatic monomer copolymer, softening point 95 ° C., Mitsui Chemicals) 50 parts by trade name, product name: FTR6100) and 1 part by weight of an imidazole-based curing catalyst (trade name: Curesol 2E4MZ, 2-ethyl-4-methylimidazole, manufactured by Shikoku Kasei Co., Ltd.) are dissolved in methyl ethyl ketone, and the solid content concentration is 30 % Adhe
- This adhesive composition 1 was applied onto the release-treated surface of a release film (product name: SP-PET382150, manufactured by Lintec Corporation), and the resulting coating film was dried at 100 ° C. for 2 minutes to obtain an adhesive having a thickness of 12 ⁇ m. An agent layer was formed, and the release treatment surface of another release film (manufactured by Lintec Corporation, trade name: SP-PET381031) was bonded thereon to obtain a sealing sheet 1.
- Example 2 In Example 1, as a polyfunctional epoxy compound, polyfunctional epoxy compound (2) (hydrogenated bisphenol A diglycidyl ether, manufactured by Mitsubishi Chemical Corporation, trade name: YX8000, epoxy equivalent 205 g / eq, weight average molecular weight: 1,400 ) was used in the same manner as in Example 1 except that a sealing sheet 2 was obtained.
- polyfunctional epoxy compound (2) hydrogenated bisphenol A diglycidyl ether, manufactured by Mitsubishi Chemical Corporation, trade name: YX8000, epoxy equivalent 205 g / eq, weight average molecular weight: 1,400
- Example 3 In Example 1, the polyfunctional epoxy compound (3) (hydrogenated bisphenol A diglycidyl ether, manufactured by Mitsubishi Chemical Corporation, trade name: YX8034, epoxy equivalent 270 g / eq, weight average molecular weight: 3,200) ) was used in the same manner as in Example 1 except that a sealing sheet 3 was obtained.
- the polyfunctional epoxy compound (3) hydrogenated bisphenol A diglycidyl ether, manufactured by Mitsubishi Chemical Corporation, trade name: YX8034, epoxy equivalent 270 g / eq, weight average molecular weight: 3,200
- Example 4 In Example 1, as the polyfunctional epoxy compound, polyfunctional epoxy compound (4) (hydrogenated bisphenol A diglycidyl ether, manufactured by Mitsubishi Chemical Corporation, trade name: YX8040, epoxy equivalent 1100 g / eq, weight average molecular weight: 4,200 ) was used in the same manner as in Example 1 except that a sealing sheet 4 was obtained.
- polyfunctional epoxy compound (4) hydrogenated bisphenol A diglycidyl ether, manufactured by Mitsubishi Chemical Corporation, trade name: YX8040, epoxy equivalent 1100 g / eq, weight average molecular weight: 4,200
- Example 1 As the polyfunctional epoxy compound, the polyfunctional epoxy compound (5) (hydrogenated bisphenol A diglycidyl ether, manufactured by Kyoeisha Chemical Co., Ltd., trade name: Epolite 4000, epoxy equivalent of 215 to 245 g / eq, weight average molecular weight: 800) was used in the same manner as in Example 1 to obtain a sealing sheet 5.
- the polyfunctional epoxy compound (5) hydrogenated bisphenol A diglycidyl ether, manufactured by Kyoeisha Chemical Co., Ltd., trade name: Epolite 4000, epoxy equivalent of 215 to 245 g / eq, weight average molecular weight: 800
- Example 2 polyfunctional epoxy compound (6) (hydrogenated bisphenol A diglycidyl ether, manufactured by ADEKA, trade name: Adeka Resin, EP-4080E, epoxy equivalent of 215 g / eq, molecular weight: 800) A sealing sheet 6 was obtained in the same manner as in Example 1 except that was used.
- polyfunctional epoxy compound (6) hydrogenated bisphenol A diglycidyl ether, manufactured by ADEKA, trade name: Adeka Resin, EP-4080E, epoxy equivalent of 215 g / eq, molecular weight: 800
- the amount of outgas generated was determined using a gas chromatograph mass spectrometer (GCMS-QP2010, manufactured by Shimadzu Corporation), and a column using 5% -Diphenyl-95% Dimethylpolysiloxane (HP-5 ms). At this time, a calibration curve was prepared using toluene.
- GCMS-QP2010 gas chromatograph mass spectrometer
- N, N′-bis (naphthalen-1-yl) -N, N′-bis (phenyl) -benzidine) (manufactured by Luminescence Technology) was 0.1 to 0.2 nm / A hole transport layer having a thickness of 50 nm is formed by vapor deposition at a rate of 30 minutes, and then, tris (8-hydroxy-quinolinate) aluminum (manufactured by Luminescence Technology) is formed on the hole transport layer in an amount of 0.1-0. Evaporation was performed at a rate of 2 nm / min to form a light emitting layer having a thickness of 50 nm.
- lithium fluoride (manufactured by High Purity Chemical Laboratory) was deposited at a rate of 0.1 nm / min to form an electron injection layer having a thickness of 4 nm, and then on the electron injection layer Then, aluminum (Al) (manufactured by High Purity Chemical Research Laboratories) was vapor-deposited at a rate of 0.1 nm / min to form a cathode having a thickness of 100 nm to obtain an organic EL device.
- the degree of vacuum at the time of vapor deposition was 1 ⁇ 10 ⁇ 4 Pa or less.
- One release film of each of the sealing sheets 1 to 6 obtained in Examples and Comparative Examples was peeled off, and the exposed adhesive layer was laminated on the metal foil film, and these were adhered at 40 ° C. using a heat laminator.
- the other release film was peeled off, and the exposed adhesive layer was stacked so as to cover the organic EL element formed on the glass substrate, and these were adhered at 40 ° C. using a heat laminator.
- the electronic device was allowed to stand for 240 hours in an environment of 85 ° C.
- Table 1 shows the following.
- the sealing sheets of Examples 1 to 4 have low outgassing properties and are excellent in evaluation tests of organic EL elements.
- the sealing sheets of Comparative Examples 1 and 2 generate a large amount of outgas and are inferior in the evaluation test of the organic EL element.
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Abstract
Description
しかし、有機EL素子には、時間の経過とともに、発光輝度、発光効率、発光均一性等の発光特性が低下し易いという問題があった。
この発光特性の低下の問題の原因として、酸素や水分等が有機EL素子の内部に浸入し、電極や有機層を劣化させることが考えられた。そのため、封止材を用いて有機EL素子を封止し、酸素や水分の浸入を防ぐことが行われてきた。
また、封止材を用いて有機EL素子を封止する場合、封止材からアウトガスが発生すると有機EL素子を劣化させることから、低アウトガス性の封止材の開発が行われてきた。
特許文献1には、その封止用組成物の硬化物は、低アウトガス性及び防湿性を有することも記載されている。
しかしながら、本発明者らの検討によれば、封止材におけるアウトガスの発生原因は硬化遅延剤だけではないため、より低アウトガス性の封止材を得るためには、さらなる検討が必要であることが分かった。
(1)下記の(A)成分、及び(B)成分を含有する接着剤組成物であって、その固形分について120℃、20分の条件でアウトガス量を測定したときに、固形分1cm3あたりのアウトガス量が20mg以下であることを特徴とする接着剤組成物。
(A)成分:変性ポリオレフィン系樹脂
(B)成分:多官能エポキシ化合物
(2)前記(A)成分が、酸変性ポリオレフィン系樹脂である、(1)に記載の接着剤組成物。
(3)前記(B)成分の含有量が、前記(A)成分100質量部に対して25~200質量部である、(1)又は(2)に記載の接着剤組成物。
(4)さらに、下記の(C)成分を含有する、(1)~(3)のいずれかに記載の接着剤組成物。
(C)成分:軟化点が80℃以上の粘着付与剤
(5)前記(C)成分の含有量が、前記(A)成分100質量部に対して1~200質量部である、(4)に記載の接着剤組成物。
(6)さらに、下記の(D)成分を含有する、(1)~(5)のいずれかに記載の接着剤組成物。
(D)成分:イミダゾール系硬化触媒
(7)前記(D)成分の含有量が、前記(A)成分100質量部に対して0.1~10質量部である、(6)に記載の接着剤組成物。
(8)さらに、下記の(E)成分を含有する、(1)~(7)のいずれかに記載の接着剤組成物。
(E)成分:シランカップリング剤
(9)前記(E)成分の含有量が、前記(A)成分100質量部に対して0.01~10質量部である、(8)に記載の接着剤組成物。
(10)2枚の剥離フィルムと、これらの剥離フィルムに挟持された接着剤層とからなる封止シートであって、前記接着剤層が、(1)~(9)のいずれかに記載の接着剤組成物を用いて形成されたものである封止シート。
(11)剥離フィルム、ガスバリア性フィルム、及び、前記剥離フィルムとガスバリア性フィルムに挟持された接着剤層からなる封止シートであって、前記接着剤層が、(1)~(9)のいずれかに記載の接着剤組成物を用いて形成されたものである封止シート。
(12)前記ガスバリア性フィルムが、金属箔、樹脂製フィルム、又は薄膜ガラスである(11)に記載の封止シート。
(13)接着剤層の厚みが5~25μmである、(10)~(12)のいずれかに記載の封止シート。
(14)被封止物が、(10)~(13)のいずれかに記載の封止シートで封止されてなる封止体。
(15)前記被封止物が、有機EL素子、有機ELディスプレイ素子、液晶ディスプレイ素子、又は太陽電池素子である、(14)に記載の封止体。
本明細書において、「低アウトガス性」とは、接着剤組成物の固形分(又は、接着剤組成物から形成された接着剤層)が高温環境下に置かれた場合であっても、放出されるアウトガス量が少ないという、接着剤組成物又は接着剤層の特性をいう。
本発明の接着剤組成物は、下記の(A)成分、及び(B)成分を含有する接着剤組成物であって、その固形分について120℃、20分の条件でアウトガス量を測定したときに、固形分1cm3あたりのアウトガス量が20mg以下であることを特徴とする。
(A)成分:変性ポリオレフィン系樹脂
(B)成分:多官能エポキシ化合物
ポリオレフィン樹脂は、オレフィン系単量体由来の繰り返し単位を含む重合体である。ポリオレフィン樹脂は、オレフィン系単量体由来の繰り返し単位の一種のみからなる単独重合体であっても、オレフィン系単量体由来の繰り返し単位の二種以上からなる共重合体であっても、オレフィン系単量体由来の繰り返し単位と、オレフィン系単量体と共重合可能な他の単量体(オレフィン系単量体以外の他の単量体)由来の繰り返し単位とからなる共重合体であってもよい。
オレフィン系単量体と共重合可能な他の単量体としては、酢酸ビニル、(メタ)アクリル酸エステル、スチレン等が挙げられる。ここで、(メタ)アクリル酸とは、アクリル酸又はメタクリル酸の意味を表す(以下にて同じ)。
ポリオレフィン樹脂の変性処理に用いる変性剤は、分子内に、官能基、すなわち、後述する架橋反応に寄与し得る基を有する化合物である。
官能基としては、カルボキシル基、カルボン酸無水物基、カルボン酸エステル基、水酸基、エポキシ基、アミド基、アンモニウム基、ニトリル基、アミノ基、イミド基、イソシアネート基、アセチル基、チオール基、エーテル基、チオエーテル基、スルホン基、リン酸基、ニトロ基、ウレタン基、ハロゲン原子等が挙げられる。これらの中でも、カルボキシル基、カルボン酸無水物基、カルボン酸エステル基、水酸基、アンモニウム基、アミノ基、イミド基、イソシアネート基が好ましく、カルボン酸無水物基、アルコキシシリル基がより好ましく、カルボン酸無水物基が特に好ましい。
官能基を有する化合物は、分子内に2種以上の官能基を有していてもよい。
これらは、1種を単独で、あるいは2種以上を組み合わせて用いることができる。これらの中でも、接着強度により優れる接着剤組成物が得られ易いことから、無水マレイン酸が好ましい。
不飽和シラン化合物を主鎖であるポリオレフィン樹脂にグラフト重合させるときの条件は、公知のグラフト重合の常法を採用すればよい。
変性ポリオレフィン系樹脂の数平均分子量(Mn)は、テトラヒドロフランを溶媒として用いてゲルパーミエーションクロマトグラフィーを行い、標準ポリスチレン換算値として求めることができる。
本発明の接着剤組成物は、(B)成分として、多官能エポキシ化合物を含有する。
本発明の接着剤組成物は、多官能エポキシ化合物を含有するため、その硬化物は水蒸気遮断性に優れるものとなる。
これらの多官能エポキシ化合物は、1種を単独で、あるいは2種以上を組み合わせて用いることができる。
(A)成分、(B)成分以外の成分としては、下記(C)成分、(D)成分、及び(E)成分が挙げられる。
(C)成分:軟化点が80℃以上の粘着付与剤
(D)成分:イミダゾール系硬化触媒
(E)成分:シランカップリング剤
(B)成分を含有する接着剤組成物は硬化前の貯蔵弾性率が低く、凹凸追従性に優れる。しかしながら、そのような接着剤組成物は、一定の形状を保ちにくく、シート状に成形するのが困難な場合がある。このようなときは、(C)成分を含有することで、成形性を改善することができる。
これらの粘着付与剤は、1種を単独で、あるいは2種以上を組み合わせて用いることができる。
イミダゾール系硬化触媒は、イミダゾール骨格を有する化合物であって、接着剤組成物の硬化反応を触媒する作用を有するものである。
イミダゾール系硬化触媒としては、2-メチルイミダゾール、2-フェニルイミダゾール、2-ウンデシルイミダゾール、2-ヘプタデシルイミダゾール、2-エチル-4-メチルイミダゾール、2-フェニル-4-メチルイミダゾール、2-フェニル-4-メチル-5-ヒドロキシメチルイミダゾール、2-フェニル-4,5-ジヒドロキシメチルイミダゾール等が挙げられる。これらの中でも、2-エチル-4-メチルイミダゾールが好ましい。
これらのイミダゾール系硬化触媒は、1種を単独で、あるいは2種以上を組み合わせて用いることができる。
シランカップリング剤は、分子内に有機材料と反応結合する官能基、および無機材料と反応結合する官能基(加水分解性基)を同時に有する有機ケイ素化合物である。
シランカップリング剤としては、公知のシランカップリング剤を用いることができ、なかでも、分子内にアルコキシシリル基を少なくとも1個有する有機ケイ素化合物が好ましい。
シランカップリング剤としては、ビニルトリメトキシシラン、ビニルトリエトキシシラン、メタクリロキシプロピルトリメトキシシラン等の重合性不飽和基含有ケイ素化合物;3-グリシドキシプロピルトリメトキシシラン、2-(3,4-エポキシシクロヘキシル)エチルトリメトキシシラン等のエポキシ構造を有するケイ素化合物;3-アミノプロピルトリメトキシシラン、N-(2-アミノエチル)-3-アミノプロピルトリメトキシシラン、N-(2-アミノエチル)-3-アミノプロピルメチルジメトキシシラン等のアミノ基含有ケイ素化合物;3-クロロプロピルトリメトキシシラン;3-イソシアネートプロピルトリエトキシシラン;等が挙げられる。
これらのシランカップリング剤は、1種単独で、あるいは2種以上を組み合わせて用いることができる。
溶媒としては、ベンゼン、トルエンなどの芳香族炭化水素系溶媒;酢酸エチル、酢酸ブチルなどのエステル系溶媒;アセトン、メチルエチルケトン、メチルイソブチルケトンなどのケトン系溶媒;n-ペンタン、n-ヘキサン、n-ヘプタンなどの脂肪族炭化水素系溶媒;シクロペンタン、シクロヘキサン、メチルシクロヘキサンなどの脂環式炭化水素系溶媒;等が挙げられる。
これらの溶媒は、1種単独で、あるいは2種以上を組み合わせて用いることができる。
溶媒の含有量は、塗工性等を考慮して適宜決定することができる。
その他の成分としては、紫外線吸収剤、帯電防止剤、光安定剤、酸化防止剤、樹脂安定剤、充填剤、顔料、増量剤、軟化剤等の添加剤が挙げられる。
これらは1種単独で、あるいは2種以上を組み合わせて用いることができる。
本発明の接着剤組成物がこれらの添加剤を含有する場合、その含有量は、目的に合わせて適宜決定することができる。
また、重量平均分子量が1,000~5,000である多官能性エポキシ化合物を用いることで、低アウトガス性の接着剤層をより容易に形成することができる。
本発明の封止シートは、下記の封止シート(α)又は封止シート(β)である。
封止シート(α):2枚の剥離フィルムと、これらの剥離フィルムに挟持された接着剤層とからなる封止シートであって、前記接着剤層が、本発明の接着剤組成物を用いて形成されたものであることを特徴とするもの
封止シート(β):剥離フィルムと、ガスバリア性フィルムと、前記剥離フィルムと前記ガスバリア性フィルムに挟持された接着剤層とからなる封止シートであって、前記接着剤層が、本発明の接着剤組成物を用いて形成されたものであることを特徴とするもの
なお、これらの封止シートは使用前の状態を表したものであり、本発明の封止シートを使用する際は、通常、剥離フィルムは剥離除去される。
封止シート(α)を構成する剥離フィルムは、封止シート(α)の製造工程においては支持体として機能するとともに、封止シート(α)を使用するまでの間は、接着剤層の保護シートとして機能する。
剥離フィルム用の基材としては、グラシン紙、コート紙、上質紙等の紙基材;これらの紙基材にポリエチレン等の熱可塑性樹脂をラミネートしたラミネート紙;ポリエチレンテレフタレート樹脂、ポリブチレンテレフタレート樹脂、ポリエチレンナフタレート樹脂、ポリプロピレン樹脂、ポリエチレン樹脂等のプラスチックフィルム;等が挙げられる。
剥離剤としては、シリコーン系樹脂、オレフィン系樹脂、イソプレン系樹脂、ブタジエン系樹脂等のゴム系エラストマー、長鎖アルキル系樹脂、アルキド系樹脂、フッ素系樹脂等が挙げられる。
このように接着剤層は非常に薄いものであるが、この接着剤層は本発明の接着剤組成物により形成されるものであるため、凹凸追従性に優れ、被着体の凹凸を十分に埋めることができる。
接着剤層を熱硬化させる際の条件は特に限定されない。
加熱温度は、通常、80~200℃、好ましくは90~150℃である。
加熱時間は、通常、30分から12時間、好ましくは1~6時間である。
上記の引き剥がし接着強度は、実施例に記載の方法に従って測定したものである。
硬化処理後の接着剤層の水蒸気透過率は、通常、0.1~200g/m2/day、好ましくは1~150g/m2/dayである。
塗膜を乾燥するときの乾燥条件は特に限定されない。例えば、乾燥温度が80~150℃、乾燥時間が30秒から5分間である。
封止シート(β)を構成する剥離フィルムと接着剤層は、それぞれ、封止シート(α)を構成する剥離フィルムと接着剤層として示したものと同様のものが挙げられる。
封止シート(β)を構成するガスバリア性フィルムは、水分遮断性を有するフィルムであれば特に限定されない。
ガスバリア性フィルムの温度40℃、90%RHの環境下における水蒸気透過率が0.1g/m2/day以下であることで、透明基板上に形成された有機EL素子等の素子内部に酸素や水分等が浸入し、電極や有機層が劣化することを効果的に抑制することができる。
ガスバリア性フィルムの水蒸気等の透過率は、公知のガス透過率測定装置を使用して測定することができる。
薄膜ガラスは、薄膜ガラスを単体として用いてもよいが、アルミ箔等の金属箔や樹脂フィルムを、薄膜ガラスに積層あるいはラミネートしたものを用いてもよい。
また、薄膜ガラスとしては、厚みが10~200μm程度のフレキシブル性を有するものが好ましい。
基材の厚みは、特に制限はないが、取り扱い易さの観点から、好ましくは0.5~500μm、より好ましくは1~200μm、さらに好ましくは5~100μmである。
無機蒸着膜としては、無機化合物や金属の蒸着膜が挙げられる。
無機化合物の蒸着膜の原料としては、酸化珪素、酸化アルミニウム、酸化マグネシウム、酸化亜鉛、酸化インジウム、酸化スズ等の無機酸化物;窒化ケイ素、窒化アルミニウム、窒化チタン等の無機窒化物;無機炭化物;無機硫化物;酸化窒化ケイ素等の無機酸化窒化物;無機酸化炭化物;無機窒化炭化物;無機酸化窒化炭化物等が挙げられる。
金属の蒸着膜の原料としては、アルミニウム、マグネシウム、亜鉛、及びスズ等が挙げられる。
られる。
無機膜の厚みは、無機材料の種類や構成により適宜選択されるが、通常、1~500であり、好ましくは、2~300nmである。
これらの中でも、優れたガスバリア性を有するガスバリア層を形成できる観点から、ケイ素含有高分子化合物が好ましく、ポリシラザン系化合物がより好ましい。
Rx、Ry、Rzは、それぞれ独立して、水素原子、無置換若しくは置換基を有するアルキル基、無置換若しくは置換基を有するシクロアルキル基、無置換若しくは置換基を有するアルケニル基、無置換若しくは置換基を有するアリール基又はアルキルシリル基等の非加水分解性基を表す。これらの中でも、Rx、Ry、Rzとしては、水素原子、炭素数1~6のアルキル基、又はフェニル基が好ましく、水素原子が特に好ましい。前記式(1)で表される繰り返し単位を有するポリシラザン系化合物としては、Rx、Ry、Rzが全て水素原子である無機ポリシラザン、Rx、Ry、Rzの少なくとも1つが水素原子ではない有機ポリシラザンのいずれであってもよい。
高分子層中の高分子化合物の含有量は、より優れたガスバリア性を有するガスバリア層が得られることから、50質量%以上が好ましく、70質量%以上がより好ましい。
本発明においては、高分子層の厚みがナノオーダーであっても、充分なガスバリア性を有する封止シートを得ることができる。
イオン注入処理は、後述するように、高分子層にイオンを注入して、高分子層を改質する方法である。
プラズマ処理は、高分子層をプラズマ中に晒して、高分子層を改質する方法である。例えば、特開2012-106421号公報に記載の方法に従って、プラズマ処理を行うことができる。
放射線照射処理は、高分子層に放射線を照射して高分子層を改質する方法である。放射線は、高分子層の結合構造を変化させる効果の高い短波長のものが好ましく、紫外線、特に真空紫外光を用いることが好ましい。例えば、特開2013-226757号公報に記載の方法に従って、真空紫外光改質処理を行うことができる。
これらの中でも、高分子層の表面を荒らすことなく、その内部まで効率よく改質し、よりガスバリア性に優れるガスバリア層を形成できることから、イオン注入処理が好ましい。
メタン、エタン等のアルカン系ガス類のイオン;エチレン、プロピレン等のアルケン系ガス類のイオン;ペンタジエン、ブタジエン等のアルカジエン系ガス類のイオン;アセチレン等のアルキン系ガス類のイオン;ベンゼン、トルエン等の芳香族炭化水素系ガス類のイオン;シクロプロパン等のシクロアルカン系ガス類のイオン;シクロペンテン等のシクロアルケン系ガス類のイオン;金属のイオン;有機ケイ素化合物のイオン;等が挙げられる。
これらのイオンは1種単独で、あるいは2種以上を組み合わせて用いることができる。
これらの中でも、より簡便にイオンを注入することができ、特に優れたガスバリア性を有するガスバリア層が得られることから、アルゴン、ヘリウム、ネオン、クリプトン、キセノン等の希ガスのイオンが好ましい。
また、封止シート(α)を製造した後、その1枚の剥離フィルムを剥離し、露出した接着剤層とガスバリア性フィルムとを貼着することにより、封止シート(β)を製造することもできる。この場合、封止シート(α)が、異なる剥離力を有する2枚の剥離フィルムを有する場合には、取扱い性の観点から、剥離力の小さい方の剥離フィルムを剥離するのが好ましい。
本発明の封止体は、被封止物が、本発明の封止シートで封止されてなるものである。
本発明の封止体としては、例えば、透明基板と、該透明基板上に形成された素子(被封止物)と、該素子を封止するための封止材とを備えるものであって、前記封止材が、本発明の封止シートの接着剤層であるものが挙げられる。
透明基板の厚さは特に制限されず、光の透過率や、素子内外を遮断する性能を勘案して、適宜選択することができる。
次いで、この接着剤層を硬化させることにより、本発明の封止体を製造することができる。
接着剤層を硬化させる際の硬化条件としては、先に説明した条件を利用することができる。
したがって、本発明の封止体においては、長期にわたって被封止物の性能が維持される。
各例中の部及び%は、特に断りのない限り、質量基準である。また、変性ポリオレフィン系樹脂及び多官能エポキシ化合物の重量平均分子量(Mw)は、以下の方法により測定した値である。
<変性ポリオレフィン系樹脂の重量平均分子量(Mw)>
変性ポリオレフィン系樹脂の重量平均分子量(Mw)は、ゲル浸透クロマトグラフ(GPC)装置(東ソー株式会社製、製品名「HLC-8320」)を用いて、下記の条件下で測定し、標準ポリスチレンの重量平均分子量に換算した値を用いた。
(測定条件)
・測定試料:変性ポリオレフィン系樹脂濃度1質量%のテトラヒドロフラン溶液
・カラム:「TSK gel Super HM-H」を2本、「TSK gel Super H2000」を1本(いずれも東ソー株式会社製)、順次連結したもの
・カラム温度:40℃
・展開溶媒:テトラヒドロフラン
・流速:0.60mL/min
<多官能エポキシ化合物の重量平均分子量(Mw)>
多官能エポキシ化合物の重量平均分子量(Mw)は、ゲル浸透クロマトグラフ(GPC)装置(東ソー株式会社製、製品名「HLC-8320」)を用いて、下記の条件下で測定し、複数観察されるピークのうち、面積が最大であるもののピークトップの保持時間に対応する標準ポリスチレンの重量平均分子量に換算したものである。
(測定条件)
・測定試料:多官能エポキシ化合物濃度1質量%のテトラヒドロフラン溶液
・カラム:「TSK gel Super HM-H」を2本、「TSK gel Super H2000」を1本(いずれも東ソー株式会社製)、順次連結したもの
・カラム温度:40℃
・展開溶媒:テトラヒドロフラン
・流速:0.60mL/min
酸変性ポリオレフィン系樹脂(α-オレフィン重合体、三井化学社製、商品名:ユニストールH-200、重量平均分子量:52,000)100部、多官能エポキシ化合物(1)(ビスフェノールAジグリシジルエーテル、三菱化学社製、商品名:YL980、エポキシ当量180~190g/eq、分子量:2,400)100部、粘着付与剤(スチレン系モノマー脂肪族系モノマー共重合体、軟化点95℃、三井化学社製、商品名:FTR6100)50部、及び、イミダゾール系硬化触媒(四国化成社製、商品名:キュアゾール2E4MZ、2-エチル-4-メチルイミダゾール)1部をメチルエチルケトンに溶解し、固形分濃度30%の接着剤組成物1を調製した。
この接着剤組成物1を剥離フィルム(リンテック社製、商品名:SP-PET382150)の剥離処理面上に塗工し、得られた塗膜を100℃で2分間乾燥し、厚みが12μmの接着剤層を形成し、その上に、もう1枚の剥離フィルム(リンテック社製、商品名:SP-PET381031)の剥離処理面を貼り合わせて封止シート1を得た。
実施例1において、多官能エポキシ化合物として、多官能エポキシ化合物(2)(水添ビスフェノールAジグリシジルエーテル、三菱化学社製、商品名:YX8000、エポキシ当量205g/eq、重量平均分子量:1,400)を使用したことを除き、実施例1と同様にして封止シート2を得た。
実施例1において、多官能エポキシ化合物として、多官能エポキシ化合物(3)(水添ビスフェノールAジグリシジルエーテル、三菱化学社製、商品名:YX8034、エポキシ当量270g/eq、重量平均分子量:3,200)を使用したことを除き、実施例1と同様にして封止シート3を得た。
実施例1において、多官能エポキシ化合物として、多官能エポキシ化合物(4)(水添ビスフェノールAジグリシジルエーテル、三菱化学社製、商品名:YX8040、エポキシ当量1100g/eq、重量平均分子量:4,200)を使用したことを除き、実施例1と同様にして封止シート4を得た。
実施例1において、多官能エポキシ化合物として、多官能エポキシ化合物(5)(水添ビスフェノールAジグリシジルエーテル、共栄社化学社製、商品名:エポライト4000、エポキシ当量215~245g/eq、重量平均分子量:800)を使用したことを除き、実施例1と同様にして封止シート5を得た。
実施例1において、多官能エポキシ化合物として、多官能エポキシ化合物(6)(水添ビスフェノールAジグリシジルエーテル、ADEKA社製、商品名:アデカレジン、EP-4080E、エポキシ当量215g/eq、分子量:800)を使用したことを除き、実施例1と同様にして封止シート6を得た。
〔低アウトガス性評価試験〕
実施例又は比較例で得た封止シートの剥離フィルム1枚を剥がし、露出した接着剤層がガラス板に対向するように、この封止シートをガラス板上に置き、ヒートラミネーターを用いて60℃で接着した。
次いで、残りの剥離フィルムを剥がしたものを測定試料として使用し、120℃、20分の条件でアウトガスを発生させ、その発生量を定量した。
アウトガスの発生量の定量は、ガスクロマトグラフ質量分析計(島津社製、GCMS-QP2010)を使用し、カラムは5%-Diphenyl-95%Dimethyl polysiloxane(HP-5ms)を使用して行った。このとき、トルエンを用いて検量線を作成した。
陽極として酸化インジウムスズ(ITO)膜(厚さ:100nm、シート抵抗:50Ω/□)が成膜されたガラス基板を用いて、以下の方法により有機EL素子を作製した。
前記ガラス基板のITO膜上に、N,N’-ビス(ナフタレン-1-イル)-N,N’-ビス(フェニル)-ベンジジン)(Luminescence Technology社製)を0.1~0.2nm/分の速度で蒸着させ、厚みが50nmの正孔輸送層を形成し、次いで、正孔輸送層上に、トリス(8-ヒドロキシ-キノリネート)アルミニウム(Luminescence Technology社製)を0.1~0.2nm/分の速度で蒸着させ、厚みが50nmの発光層を形成した。前記発光層上に、フッ化リチウム(LiF)(高純度化学研究所社製)を0.1nm/分の速度で蒸着させ、厚みが4nmの電子注入層を形成し、次いで、電子注入層上に、アルミニウム(Al)(高純度化学研究所社製)を0.1nm/分の速度で蒸着させ、厚みが100nmの陰極を形成し、有機EL素子を得た。なお、蒸着時の真空度は、全て1×10-4Pa以下であった。
この電子デバイスを、85℃、相対湿度85%の環境下で240時間放置した後、有機EL素子を起動させ、ダークスポット(非発光箇所)の面積を測定した。
85℃、相対湿度85%の環境下で放置する前の電子デバイスのダークスポットの面積を基準としたダークスポットの拡大率を算出し、以下の基準で評価した。
<基準>
○:ダークスポットの拡大率が150%未満
×:ダークスポットの拡大率が150%以上
評価結果を第1表に示す。
実施例1~4の封止シートは、低アウトガス性を有し、有機EL素子の評価試験において優れている。
一方、比較例1、2の封止シートは、アウトガスが大量に発生するものであり、有機EL素子の評価試験において劣っている。
Claims (15)
- 下記の(A)成分、及び(B)成分を含有する接着剤組成物であって、その固形分について120℃、20分の条件でアウトガス量を測定したときに、固形分1cm3あたりのアウトガス量が20mg以下であることを特徴とする接着剤組成物。
(A)成分:変性ポリオレフィン系樹脂
(B)成分:多官能エポキシ化合物 - 前記(A)成分が、酸変性ポリオレフィン系樹脂である、請求項1に記載の接着剤組成物。
- 前記(B)成分の含有量が、前記(A)成分100質量部に対して25~200質量部である、請求項1又は2に記載の接着剤組成物。
- さらに、下記の(C)成分を含有する、請求項1~3のいずれかに記載の接着剤組成物。
(C)成分:軟化点が80℃以上の粘着付与剤 - 前記(C)成分の含有量が、前記(A)成分100質量部に対して1~200質量部である、請求項4に記載の接着剤組成物。
- さらに、下記の(D)成分を含有する、請求項1~5のいずれかに記載の接着剤組成物。
(D)成分:イミダゾール系硬化触媒 - 前記(D)成分の含有量が、前記(A)成分100質量部に対して0.1~10質量部である、請求項6に記載の接着剤組成物。
- さらに、下記の(E)成分を含有する、請求項1~7のいずれかに記載の接着剤組成物。
(E)成分:シランカップリング剤 - 前記(E)成分の含有量が、前記(A)成分100質量部に対して0.01~10質量部である、請求項8に記載の接着剤組成物。
- 2枚の剥離フィルムと、これらの剥離フィルムに挟持された接着剤層とからなる封止シートであって、
前記接着剤層が、請求項1~9のいずれかに記載の接着剤組成物を用いて形成されたものである封止シート。 - 剥離フィルム、ガスバリア性フィルム、及び、前記剥離フィルムとガスバリア性フィルムに挟持された接着剤層からなる封止シートであって、
前記接着剤層が、請求項1~9のいずれかに記載の接着剤組成物を用いて形成されたものである封止シート。 - 前記ガスバリア性フィルムが、金属箔、樹脂製フィルム、又は薄膜ガラスである請求項11に記載の封止シート。
- 接着剤層の厚みが5~25μmである、請求項10~12のいずれかに記載の封止シート。
- 被封止物が、請求項10~13のいずれかに記載の封止シートで封止されてなる封止体。
- 前記被封止物が、有機EL素子、有機ELディスプレイ素子、液晶ディスプレイ素子、又は太陽電池素子である、請求項14に記載の封止体。
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WO2018221571A1 (ja) * | 2017-05-31 | 2018-12-06 | リンテック株式会社 | 接着シート、及び封止体 |
WO2019240261A1 (ja) * | 2018-06-15 | 2019-12-19 | リンテック株式会社 | デバイス封止用接着シート、及びデバイス封止体を製造する方法 |
JPWO2018179458A1 (ja) * | 2017-03-30 | 2020-02-06 | リンテック株式会社 | ガスバリア性積層体、及び封止体 |
CN111955053A (zh) * | 2018-03-28 | 2020-11-17 | 琳得科株式会社 | 电子设备密封体、片状粘接剂、电子设备密封用粘接膜和电子设备密封体的制造方法 |
WO2021100339A1 (ja) * | 2019-11-22 | 2021-05-27 | 昭和電工株式会社 | 複合積層体及び、接合体 |
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WO2018092800A1 (ja) * | 2016-11-18 | 2018-05-24 | リンテック株式会社 | 接着剤組成物、封止シート、及び封止体 |
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