WO2023032685A1 - 粘着シート付き反射防止フィルム及び画像表示装置 - Google Patents
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- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 description 1
- 125000004491 isohexyl group Chemical group C(CCC(C)C)* 0.000 description 1
- 125000001972 isopentyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])C([H])([H])* 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 150000003951 lactams Chemical class 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000004611 light stabiliser Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910003473 lithium bis(trifluoromethanesulfonyl)imide Inorganic materials 0.000 description 1
- 229910003002 lithium salt Inorganic materials 0.000 description 1
- 159000000002 lithium salts Chemical class 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- ORUIBWPALBXDOA-UHFFFAOYSA-L magnesium fluoride Chemical compound [F-].[F-].[Mg+2] ORUIBWPALBXDOA-UHFFFAOYSA-L 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 125000005395 methacrylic acid group Chemical group 0.000 description 1
- CZXGXYBOQYQXQD-UHFFFAOYSA-N methyl benzenesulfonate Chemical compound COS(=O)(=O)C1=CC=CC=C1 CZXGXYBOQYQXQD-UHFFFAOYSA-N 0.000 description 1
- GYNNXHKOJHMOHS-UHFFFAOYSA-N methyl-cycloheptane Natural products CC1CCCCCC1 GYNNXHKOJHMOHS-UHFFFAOYSA-N 0.000 description 1
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- 125000000896 monocarboxylic acid group Chemical group 0.000 description 1
- BEBFQENAYPXOFB-UHFFFAOYSA-N n-(sulfanylmethyl)prop-2-enamide Chemical compound SCNC(=O)C=C BEBFQENAYPXOFB-UHFFFAOYSA-N 0.000 description 1
- QYZFTMMPKCOTAN-UHFFFAOYSA-N n-[2-(2-hydroxyethylamino)ethyl]-2-[[1-[2-(2-hydroxyethylamino)ethylamino]-2-methyl-1-oxopropan-2-yl]diazenyl]-2-methylpropanamide Chemical compound OCCNCCNC(=O)C(C)(C)N=NC(C)(C)C(=O)NCCNCCO QYZFTMMPKCOTAN-UHFFFAOYSA-N 0.000 description 1
- 125000004108 n-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000001280 n-hexyl group Chemical group C(CCCCC)* 0.000 description 1
- 125000000740 n-pentyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- QNILTEGFHQSKFF-UHFFFAOYSA-N n-propan-2-ylprop-2-enamide Chemical compound CC(C)NC(=O)C=C QNILTEGFHQSKFF-UHFFFAOYSA-N 0.000 description 1
- JTHNLKXLWOXOQK-UHFFFAOYSA-N n-propyl vinyl ketone Natural products CCCC(=O)C=C JTHNLKXLWOXOQK-UHFFFAOYSA-N 0.000 description 1
- OPECTNGATDYLSS-UHFFFAOYSA-N naphthalene-2-sulfonyl chloride Chemical compound C1=CC=CC2=CC(S(=O)(=O)Cl)=CC=C21 OPECTNGATDYLSS-UHFFFAOYSA-N 0.000 description 1
- SLCVBVWXLSEKPL-UHFFFAOYSA-N neopentyl glycol Chemical compound OCC(C)(C)CO SLCVBVWXLSEKPL-UHFFFAOYSA-N 0.000 description 1
- 229910000484 niobium oxide Inorganic materials 0.000 description 1
- URLJKFSTXLNXLG-UHFFFAOYSA-N niobium(5+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Nb+5].[Nb+5] URLJKFSTXLNXLG-UHFFFAOYSA-N 0.000 description 1
- 125000004433 nitrogen atom Chemical group N* 0.000 description 1
- 125000003518 norbornenyl group Chemical group C12(C=CC(CC1)C2)* 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- TWCBCCIODCKPGX-UHFFFAOYSA-N octyl 2-[4-[4,6-bis(4-phenylphenyl)-1,3,5-triazin-2-yl]-3-hydroxyphenoxy]propanoate Chemical compound OC1=CC(OC(C)C(=O)OCCCCCCCC)=CC=C1C1=NC(C=2C=CC(=CC=2)C=2C=CC=CC=2)=NC(C=2C=CC(=CC=2)C=2C=CC=CC=2)=N1 TWCBCCIODCKPGX-UHFFFAOYSA-N 0.000 description 1
- 239000012766 organic filler Substances 0.000 description 1
- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- VLTRZXGMWDSKGL-UHFFFAOYSA-M perchlorate Inorganic materials [O-]Cl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-M 0.000 description 1
- VLTRZXGMWDSKGL-UHFFFAOYSA-N perchloric acid Chemical compound OCl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-N 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 238000005268 plasma chemical vapour deposition Methods 0.000 description 1
- 238000009832 plasma treatment Methods 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- 229920002530 polyetherether ketone Polymers 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 239000011112 polyethylene naphthalate Substances 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 229920000069 polyphenylene sulfide Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 229910001414 potassium ion Inorganic materials 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- SCUZVMOVTVSBLE-UHFFFAOYSA-N prop-2-enenitrile;styrene Chemical compound C=CC#N.C=CC1=CC=CC=C1 SCUZVMOVTVSBLE-UHFFFAOYSA-N 0.000 description 1
- HJWLCRVIBGQPNF-UHFFFAOYSA-N prop-2-enylbenzene Chemical compound C=CCC1=CC=CC=C1 HJWLCRVIBGQPNF-UHFFFAOYSA-N 0.000 description 1
- 229920005604 random copolymer Polymers 0.000 description 1
- 238000007717 redox polymerization reaction Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011342 resin composition Substances 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- YGSDEFSMJLZEOE-UHFFFAOYSA-M salicylate Chemical compound OC1=CC=CC=C1C([O-])=O YGSDEFSMJLZEOE-UHFFFAOYSA-M 0.000 description 1
- 229960001860 salicylate Drugs 0.000 description 1
- YGSDEFSMJLZEOE-UHFFFAOYSA-N salicylic acid Chemical group OC(=O)C1=CC=CC=C1O YGSDEFSMJLZEOE-UHFFFAOYSA-N 0.000 description 1
- 125000002914 sec-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 150000004756 silanes Chemical class 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 239000012321 sodium triacetoxyborohydride Substances 0.000 description 1
- BWYYYTVSBPRQCN-UHFFFAOYSA-M sodium;ethenesulfonate Chemical compound [Na+].[O-]S(=O)(=O)C=C BWYYYTVSBPRQCN-UHFFFAOYSA-M 0.000 description 1
- 238000002798 spectrophotometry method Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- 125000000542 sulfonic acid group Chemical group 0.000 description 1
- 125000005463 sulfonylimide group Chemical group 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- 238000010345 tape casting Methods 0.000 description 1
- ISXSCDLOGDJUNJ-UHFFFAOYSA-N tert-butyl prop-2-enoate Chemical compound CC(C)(C)OC(=O)C=C ISXSCDLOGDJUNJ-UHFFFAOYSA-N 0.000 description 1
- DZLFLBLQUQXARW-UHFFFAOYSA-N tetrabutylammonium Chemical compound CCCC[N+](CCCC)(CCCC)CCCC DZLFLBLQUQXARW-UHFFFAOYSA-N 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 description 1
- JOXIMZWYDAKGHI-UHFFFAOYSA-N toluene-4-sulfonic acid Chemical compound CC1=CC=C(S(O)(=O)=O)C=C1 JOXIMZWYDAKGHI-UHFFFAOYSA-N 0.000 description 1
- LDHQCZJRKDOVOX-UHFFFAOYSA-N trans-crotonic acid Natural products CC=CC(O)=O LDHQCZJRKDOVOX-UHFFFAOYSA-N 0.000 description 1
- JLGLQAWTXXGVEM-UHFFFAOYSA-N triethylene glycol monomethyl ether Chemical compound COCCOCCOCCO JLGLQAWTXXGVEM-UHFFFAOYSA-N 0.000 description 1
- ITMCEJHCFYSIIV-UHFFFAOYSA-M triflate Chemical compound [O-]S(=O)(=O)C(F)(F)F ITMCEJHCFYSIIV-UHFFFAOYSA-M 0.000 description 1
- 239000013638 trimer Substances 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Images
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
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/38—Pressure-sensitive adhesives [PSA]
- C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- C09J7/385—Acrylic polymers
-
- 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
-
- 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
- C09J11/04—Non-macromolecular additives inorganic
-
- 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
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
-
- 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
- C09J201/00—Adhesives based on unspecified macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/38—Pressure-sensitive adhesives [PSA]
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/11—Anti-reflection coatings
-
- 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
-
- 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
-
- 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
- H10K50/86—Arrangements for improving contrast, e.g. preventing reflection of ambient light
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/017—Additives being an antistatic agent
Definitions
- the present invention relates to an antireflection film with an adhesive sheet and an image display device.
- image display devices typified by electroluminescence (EL) display devices and liquid crystal display devices have rapidly spread.
- These image display devices have a laminated structure including, for example, an image forming layer such as an EL light-emitting layer or a liquid crystal layer, and an optical laminate including an optical film and an adhesive sheet.
- the pressure-sensitive adhesive sheet is mainly used for bonding between films included in the optical layered body and bonding between the image forming layer and the optical layered body.
- the optical film are a polarizing plate, a retardation film, and a polarizing plate with a retardation film in which the polarizing plate and the retardation film are integrated.
- a circularly polarizing plate including a polarizing plate and a retardation film is sometimes used as an optical film in order to suppress reflection of light entering the device (for example, Patent Document 1).
- the polarizer included in the circularly polarizing plate absorbs the light from the EL light-emitting layer, the brightness of the light emitted from the EL display device including the circularly polarizing plate tends to be low. Also, increasing the emission intensity of the element to obtain the desired luminance increases the required power consumption.
- Patent Documents 2 and 3 disclose an EL display device using a film having an antireflection function instead of the circularly polarizing plate.
- a film having an antireflection function includes a film provided with an antireflection (AR) function, an antiglare (AG) function, or both of these functions.
- OLED organic EL display device
- OLED organic EL display device
- an object of the present invention is to provide an antireflection film with an adhesive sheet that is suitable for use in OLEDs.
- the present invention An antireflection film with an adhesive sheet, comprising an adhesive sheet and an antireflection film,
- the antireflection film with an adhesive sheet does not contain a polarizer
- the pressure-sensitive adhesive sheet provides an antireflection film with a pressure-sensitive adhesive sheet having a surface resistivity of 9 ⁇ 10 11 ⁇ / ⁇ or less.
- the invention provides a Provided is an image display device comprising the antireflection film with an adhesive sheet of the present invention.
- the unintended light emission of the OLED when the display portion is touched is mainly caused by the static electricity generated by the contact. Charging of OLED can be suppressed. Therefore, the antireflection film with adhesive sheet of the present invention is suitable for use in OLEDs.
- FIG. 1 is a cross-sectional view schematically showing an example of the antireflection film with a pressure-sensitive adhesive sheet of the present invention.
- FIG. 2 is a cross-sectional view schematically showing an example of the antireflection film.
- FIG. 3 is a cross-sectional view schematically showing another example of the antireflection film with a pressure-sensitive adhesive sheet of the present invention.
- FIG. 4 is a cross-sectional view schematically showing an example of the image display device of the present invention.
- FIG. 5 is a cross-sectional view schematically showing another example of the image display device of the present invention.
- (meth)acrylic means acrylic and methacrylic.
- (meth)acrylate means acrylate and methacrylate.
- the adhesive sheet-attached antireflection film 10 (10A) of the present embodiment includes an adhesive sheet 1 and an antireflection film 2, and for example, is composed of only the adhesive sheet 1 and the antireflection film 2. ing.
- the adhesive sheet 1 is arranged, for example, on the surface of the antireflection film 2 and joined to the antireflection film 2 .
- the adhesive sheet-attached antireflection film 10A can be attached to an object (for example, an image forming layer of an image display device) via the adhesive sheet 1 .
- 10 A of antireflection films with an adhesive sheet do not contain a polarizer.
- the adhesive sheet-attached antireflection film 10A does not include a polarizing plate or a circularly polarizing plate.
- the antireflection film 10A with an adhesive sheet may not contain a retardation film.
- the adhesive sheet 1 has a surface resistivity of 9 ⁇ 10 11 ⁇ / ⁇ or less.
- the surface resistivity of the adhesive sheet 1 is 5 ⁇ 10 11 ⁇ / ⁇ or less, 1 ⁇ 10 11 ⁇ / ⁇ or less, 9 ⁇ 10 10 ⁇ / ⁇ or less, 5 ⁇ 10 10 ⁇ / ⁇ or less, 3 ⁇ 10 10 ⁇ or less. / ⁇ or less, 1 ⁇ 10 10 ⁇ / ⁇ or less, 9 ⁇ 10 9 ⁇ / ⁇ or less, 5 ⁇ 10 9 ⁇ / ⁇ or less, 3 ⁇ 10 9 ⁇ / ⁇ or less, 2 ⁇ 10 9 ⁇ / ⁇ or less, and further may be 1 ⁇ 10 9 ⁇ / ⁇ or less.
- the lower limit of surface resistivity is, for example, 1 ⁇ 10 7 ⁇ / ⁇ or more.
- the surface resistivity of the adhesive sheet 1 can be evaluated by, for example, a high resistance resistivity meter (eg, Hiresta series manufactured by Mitsubishi Chemical Analytic Tech).
- the adhesive sheet 1 is, for example, a sheet formed from an adhesive composition (I) containing a (meth)acrylic polymer (A).
- the pressure-sensitive adhesive sheet 1 formed from the pressure-sensitive adhesive composition (I) contains, for example, a cured product of a (meth)acrylic polymer (A).
- the adhesive sheet 1 is not limited to the above examples.
- the pressure-sensitive adhesive composition (I) contains, for example, a (meth)acrylic polymer (A) as a main component.
- the pressure-sensitive adhesive composition (I) is an acrylic pressure-sensitive adhesive composition.
- a main component means the component with the largest content rate in a composition.
- the content of the main component is, for example, 50% by weight or more, and may be 60% by weight or more, 70% by weight or more, 75% by weight or more, or even 80% by weight or more.
- the (meth)acrylic polymer (A) preferably has structural units derived from the (meth)acrylic monomer (A1) having an alkyl group having 1 to 30 carbon atoms in its side chain.
- the (meth)acrylic polymer (A) may have the above structural unit as a main unit.
- the alkyl group may be linear or branched.
- the (meth)acrylic polymer (A) may have one or more structural units derived from the (meth)acrylic monomer (A1).
- Examples of (meth) acrylic monomers (A1) include methyl (meth) acrylate, ethyl (meth) acrylate, n-butyl (meth) acrylate, s-butyl (meth) acrylate, t-butyl (meth) acrylate.
- the term "main unit" refers to the total structural units of the poly
- the (meth)acrylic polymer (A) may have structural units derived from the (meth)acrylic monomer (A1) having a long-chain alkyl group in its side chain.
- An example of said monomer (A1) is n-dodecyl (meth)acrylate (lauryl (meth)acrylate).
- the term "long-chain alkyl group” means an alkyl group having 6 to 30 carbon atoms.
- the (meth)acrylic polymer (A) is a structural unit derived from the (meth)acrylic monomer (A1) having a glass transition temperature (Tg) in the range of ⁇ 70 to ⁇ 20° C. when homopolymerized. may have An example of said monomer (A1) is n-butyl acrylate.
- the (meth)acrylic polymer (A) may have structural units other than the structural units derived from the (meth)acrylic monomer (A1).
- the structural unit is derived from the monomer (A2) copolymerizable with the (meth)acrylic monomer (A1).
- the (meth)acrylic polymer (A) may have one or more of these structural units.
- the monomer (A2) is an aromatic ring-containing monomer.
- the aromatic ring-containing monomer may be an aromatic ring-containing (meth)acrylic monomer.
- aromatic ring-containing monomers include phenyl (meth) acrylate, phenoxyethyl (meth) acrylate, benzyl (meth) acrylate, phenoxydiethylene glycol (meth) acrylate, ethylene oxide-modified nonylphenol (meth) acrylate, hydroxyethylated ⁇ - naphthol (meth)acrylate and biphenyl (meth)acrylate.
- the content of structural units derived from aromatic ring-containing monomers in the (meth)acrylic polymer (A) is, for example, 0 to 50% by weight, 1 to 30% by weight, 5 to 25% by weight, 8 to 20% by weight. % by weight, 10 to 19% by weight, or even 13 to 18% by weight, or even 0% by weight (without including the structural unit).
- the hydroxyl group-containing monomer may be a hydroxyl group-containing (meth)acrylic monomer.
- hydroxyl-containing monomers are 2-hydroxyethyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, 8-hydroxyoctyl ( hydroxyalkyl (meth)acrylates such as meth)acrylates, 10-hydroxydecyl (meth)acrylate and 12-hydroxylauryl (meth)acrylate, and (4-hydroxymethylcyclohexyl)-methylacrylate.
- the content of structural units derived from hydroxyl group-containing monomers in the (meth)acrylic polymer (A) may be 5% by weight or less, 3% by weight or less, 2% by weight or less, 1% by weight or less, It may be 0.5% by weight or less, further 0.1% by weight or less, or even 0% by weight (without including the structural unit).
- R 1 in Formula (1) is a hydrogen atom or a methyl group.
- R 2 in formula (1) is an alkyl group. The alkyl group may be linear or branched.
- R 2 is preferably a linear alkyl group. Examples of R 2 are methyl and ethyl groups.
- n in formula (1) is an integer of 1-15.
- Examples of (meth)acrylates shown in formula (1) are 2-methoxyethyl (meth)acrylate, 2-ethoxyethyl (meth)acrylate and methoxytriethylene glycol (meth)acrylate, preferably 2-methoxyethyl acrylate (MEA).
- the structural unit derived from the (meth)acrylate of formula (1) can contribute to reducing the surface resistivity of the pressure-sensitive adhesive sheet 1 .
- the surface resistivity of the pressure-sensitive adhesive sheet 1 tends to be reduced while suppressing the amount of the antistatic agent (B) to be described later.
- the (meth)acrylic polymer (A) may have a structural unit derived from the (meth)acrylate of formula (1) as a main unit.
- the monomer (A2) may be a carboxyl group-containing monomer, an amino group-containing monomer, or an amide group-containing monomer.
- carboxyl group-containing monomers are (meth)acrylic acid, carboxyethyl (meth)acrylate, carboxypentyl (meth)acrylate, itaconic acid, maleic acid, fumaric acid and crotonic acid.
- amino group-containing monomers are N,N-dimethylaminoethyl (meth)acrylate and N,N-dimethylaminopropyl (meth)acrylate.
- amide group-containing monomers are (meth)acrylamide, N,N-dimethyl(meth)acrylamide, N,N-diethyl(meth)acrylamide, N-isopropylacrylamide, N-methyl(meth)acrylamide, N- Butyl (meth)acrylamide, N-hexyl (meth)acrylamide, N-methylol (meth)acrylamide, N-methylol-N-propane (meth)acrylamide, aminomethyl (meth)acrylamide, aminoethyl (meth)acrylamide, mercaptomethyl acrylamide-based monomers such as (meth)acrylamide and mercaptoethyl (meth)acrylamide; N-acryloyl heterocycles such as N-(meth)acryloylmorpholine, N-(meth)acryloylpiperidine and N-(meth)acryloylpyrrolidine and N-vinyl group-containing lactam monomers such as N-vinylpyrrolidon
- the monomer (A2) may be a polyfunctional monomer.
- multifunctional monomers are hexanediol di(meth)acrylate (1,6-hexanediol di(meth)acrylate), butanediol di(meth)acrylate, (poly)ethylene glycol di(meth)acrylate, (Poly)propylene glycol di(meth)acrylate, neopentyl glycol di(meth)acrylate, pentaerythritol di(meth)acrylate, pentaerythritol tri(meth)acrylate, dipentaerythritol hexa(meth)acrylate, trimethylolpropane tri( polyfunctional acrylates such as meth)acrylates, tetramethylolmethane tri(meth)acrylates, allyl (meth)acrylates, vinyl (meth)acrylates, epoxy acrylates, polyester acrylates and urethane acrylates; and divin
- the total content of structural units derived from the carboxyl group-containing monomer, amino group-containing monomer, amide group-containing monomer and polyfunctional monomer in the (meth)acrylic polymer (A) is preferably is 20% by weight or less, more preferably 10% by weight or less, and still more preferably 8% by weight or less.
- the total content is, for example, 0.01% by weight or more, 1% by weight or more, 2% by weight or more, or even 3% by weight or more. There may be.
- the (meth)acrylic polymer (A) may not contain structural units derived from polyfunctional monomers.
- Examples of other monomers (A2) include epoxy group-containing monomers such as glycidyl (meth)acrylate and methylglycidyl (meth)acrylate; sulfonic acid group-containing monomers such as sodium vinyl sulfonate; Acid group-containing monomers; (meth)acrylic acid esters having an alicyclic hydrocarbon group such as cyclopentyl (meth)acrylate, cyclohexyl (meth)acrylate and isobornyl (meth)acrylate; vinyl acetate and vinyl propionate aromatic vinyl compounds such as styrene and vinyl toluene; olefins or dienes such as ethylene, propylene, butadiene, isoprene and isobutylene; vinyl ethers such as vinyl alkyl ethers; and vinyl chloride.
- epoxy group-containing monomers such as glycidyl (meth)acrylate and methylglycidyl (meth)acrylate
- the total content of structural units derived from the other monomer (A2) in the (meth)acrylic polymer (A) is, for example, 30% by weight or less, and may be 10% by weight or less, or 0 % by weight (not including the structural unit).
- the (meth)acrylic polymer (A) can be formed by polymerizing one or more of the above monomers by a known method. A monomer and a partial polymer of the monomer may be polymerized. Polymerization can be carried out, for example, by solution polymerization, emulsion polymerization, bulk polymerization, thermal polymerization, or active energy ray polymerization. Solution polymerization and active energy ray polymerization are preferable from the viewpoint of forming a pressure-sensitive adhesive sheet having excellent optical transparency. Polymerization is preferably carried out while avoiding contact of the monomer and/or partial polymer with oxygen. Polymerization in shutdown can be employed.
- the (meth)acrylic polymer (A) to be formed may be in any form such as a random copolymer, a block copolymer, or a graft copolymer.
- the polymerization system forming the (meth)acrylic polymer (A) may contain one or more polymerization initiators.
- the type of polymerization initiator can be selected depending on the polymerization reaction, and may be, for example, a thermal polymerization initiator or a photopolymerization initiator.
- Solvents used for solution polymerization include esters such as ethyl acetate and n-butyl acetate; aromatic hydrocarbons such as toluene and benzene; aliphatic hydrocarbons such as n-hexane and n-heptane; alicyclic hydrocarbons such as methylcyclohexane; and ketones such as methyl ethyl ketone and methyl isobutyl ketone.
- the solvent is not limited to the above examples.
- the solvent may be a mixed solvent of two or more solvents.
- Polymerization initiators used for solution polymerization are, for example, azo polymerization initiators, peroxide polymerization initiators, and redox polymerization initiators.
- Peroxide polymerization initiators are, for example, dibenzoyl peroxide and t-butyl permaleate.
- the azo polymerization initiator disclosed in JP-A-2002-69411 is preferable.
- the azo polymerization initiator for example, 2,2'-azobisisobutyronitrile (AIBN), 2,2'-azobis-2-methylbutyronitrile, 2,2'-azobis (2-methylpropion acid) dimethyl, 4,4'-azobis-4-cyanovaleric acid.
- AIBN 2,2'-azobisisobutyronitrile
- 2,2'-azobis-2-methylbutyronitrile 2,2'-azobis (2-methylpropion acid) dimethyl
- 4,4'-azobis-4-cyanovaleric acid is not limited to the above examples.
- the active energy rays used for active energy ray polymerization are, for example, ionizing radiation such as ⁇ -rays, ⁇ -rays, ⁇ -rays, neutron beams and electron beams, and ultraviolet rays.
- the active energy rays are preferably ultraviolet rays.
- Polymerization by irradiation with ultraviolet rays is also called photopolymerization.
- a polymerization system for active energy ray polymerization typically contains a photopolymerization initiator. Polymerization conditions for active energy polymerization are not limited as long as the (meth)acrylic polymer (A) is formed.
- Photopolymerization initiators include, for example, benzoin ether-based photopolymerization initiators, acetophenone-based photopolymerization initiators, ⁇ -ketol-based photopolymerization initiators, aromatic sulfonyl chloride-based photopolymerization initiators, and photoactive oxime-based photopolymerization initiators. , a benzoin-based photopolymerization initiator, a benzyl-based photopolymerization initiator, a benzophenone-based photopolymerization initiator, a ketal-based photopolymerization initiator, and a thioxanthone-based photopolymerization initiator.
- the photopolymerization initiator is not limited to the above examples.
- Benzoin ether-based photopolymerization initiators include, for example, benzoin methyl ether, benzoin ethyl ether, benzoin propyl ether, benzoin isopropyl ether, benzoin isobutyl ether, 2,2-dimethoxy-1,2-diphenylethan-1-one, anisolemethyl is ether.
- Acetophenone-based photopolymerization initiators include, for example, 2,2-diethoxyacetophenone, 2,2-dimethoxy-2-phenylacetophenone, 1-hydroxycyclohexylphenylketone, 4-phenoxydichloroacetophenone, 4-(t-butyl)dichloro Acetophenone.
- Examples of ⁇ -ketol photopolymerization initiators are 2-methyl-2-hydroxypropiophenone and 1-[4-(2-hydroxyethyl)phenyl]-2-methylpropan-1-one.
- the aromatic sulfonyl chloride photopolymerization initiator is, for example, 2-naphthalenesulfonyl chloride.
- a photoactive oxime-based photopolymerization initiator is, for example, 1-phenyl-1,1-propanedione-2-(o-ethoxycarbonyl)-oxime.
- a benzoin-based photopolymerization initiator is, for example, benzoin.
- a benzylic photopolymerization initiator is, for example, benzyl.
- benzophenone-based photopolymerization initiators examples include benzophenone, benzoylbenzoic acid, 3,3'-dimethyl-4-methoxybenzophenone, polyvinylbenzophenone, and ⁇ -hydroxycyclohexylphenyl ketone.
- a ketal photopolymerization initiator is, for example, benzyl dimethyl ketal.
- Thioxanthone-based photopolymerization initiators are, for example, thioxanthone, 2-chlorothioxanthone, 2-methylthioxanthone, 2,4-dimethylthioxanthone, isopropylthioxanthone, 2,4-diisopropylthioxanthone, and dodecylthioxanthone.
- the amount of the photopolymerization initiator used is, for example, 0.01 to 1 part by weight, and may be 0.05 to 0.5 part by weight, based on 100 parts by weight of the total amount of the monomers.
- the weight average molecular weight (Mw) of the (meth)acrylic polymer (A) is, for example, 1,000,000 to 2,800,000, and from the viewpoint of the durability and heat resistance of the pressure-sensitive adhesive sheet, it is 1,200,000 or more, further 1,400,000 or more. may be
- the weight average molecular weight (Mw) of polymers and oligomers in this specification is a value (converted to polystyrene) based on GPC (gel permeation chromatography) measurement.
- the content of the (meth)acrylic polymer (A) in the pressure-sensitive adhesive composition (I) is, for example, 50% by weight or more, 60% by weight or more, 70% by weight or more, and further 80% by weight in terms of solid content. or more.
- the upper limit of the content is, for example, 99% by weight or less, and may be 97% by weight or less, 95% by weight or less, 93% by weight or less, or even 90% by weight or less.
- the pressure-sensitive adhesive composition (I) further contains, for example, an antistatic agent (B).
- the amount of the antistatic agent (B) is, for 100 parts by weight of the (meth)acrylic polymer (A), for example less than 10 parts by weight, 8 parts by weight or less, 7 parts by weight or less, 6 parts by weight or less, 5 parts by weight or less, 4 parts by weight or less, 3 parts by weight or less, 2 parts by weight or less, 1 part by weight or less, 0.8 parts by weight or less, 0.6 parts by weight or less, 0.5 parts by weight or less, 0.3 parts by weight parts or less, 0.1 parts by weight or less, or even 0.05 parts by weight or less.
- a touch panel may be incorporated inside an image display device, typically an OLED used in a mobile device such as a smart phone. There is also an on-cell or the like in which a touch panel is arranged on the viewing side of the image forming layer.
- a touch panel usually includes a conductive layer such as a metal layer. According to the studies of the present inventors, the conductive layer, especially the metal layer, is susceptible to corrosion by the antistatic agent (B). From this point of view, the smaller the content of the antistatic agent (B), the more suitable the PSA composition (I) is for use in OLEDs.
- antistatic agents (B) are ionic compounds such as salts.
- the ionic compound may be an ionic liquid that is liquid at normal temperature (25° C.). Ionic compounds generally have higher compatibility with the adhesive composition (I) than, for example, conductive fine particles, and are suitable for forming adhesive sheets with excellent optical transparency.
- the pressure-sensitive adhesive composition (I) may be substantially free of conductive fine particles.
- the pressure-sensitive adhesive composition (I) does not substantially contain 0.5 parts by weight or less, preferably 0.1 parts by weight, relative to 100 parts by weight of the (meth)acrylic polymer (A) parts by weight or less, more preferably 0.05 parts by weight or less, and still more preferably 0.01 parts by weight or less.
- Examples of cations that make up ionic compounds are metal ions and onium ions.
- metal ions are alkali metal ions and alkaline earth metal ions.
- Alkali metal ions are, for example, lithium ions, sodium ions and potassium ions, and may also be lithium ions.
- Alkaline earth metal ions are, for example, magnesium ions and calcium ions.
- metal ions are not limited to the above examples.
- onium ions are ions in which at least one atom selected from a nitrogen atom, a phosphorus atom and a sulfur atom is positively (+) charged.
- the onium ion may be an organic ion, in which case it may be an ion of a cyclic organic compound or an ion of a chain organic compound.
- the cyclic organic compounds may be aromatic or non-aromatic such as aliphatic.
- onium ions are N-ethyl-N,N-dimethyl-N-(2-methoxyethyl)ammonium ion, N,N-diethyl-N-methyl-N-(2-methoxyethyl)ammonium ion, N- Ethyl-N,N-dimethyl-N-propylammonium ion, N-methyl-N,N,N-trioctylammonium ion, N,N,N-trimethyl-N-propylammonium ion, tetrabutylammonium ion, tetramethyl quaternary ammonium ions such as ammonium ions, tetrahexylammonium ions and N-methyl-N,N,N-tributylammonium ions; pyridinium ions such as N-alkylpyridinium substituted with alkyl groups having 4 to 16 carbon atoms; carbon 1,3-alkyl
- onium ions are not limited to the above examples.
- anions constituting ionic compounds are fluoride, chloride, bromide, iodide, perchlorate (ClO 4 ⁇ ), hydroxide (OH ⁇ ), carbonate (CO 3 2 ⁇ ), nitrate (NO 3 ⁇ ), sulfonate (SO 4 ⁇ ), methylbenzenesulfonate (CH 3 (C 6 H 4 )SO 3 ⁇ ), p-toluenesulfonate (CH 3 C 6 H 4 SO 3 ⁇ ), carboxybenzenesulfonate (COOH(C 6 H 4 ) SO 3 ⁇ ), trifluoromethanesulfonate (CF 3 SO 2 ⁇ ), benzoate (C 6 H 5 COO ⁇ ), acetate (CH 3 COO ⁇ ), trifluoroacetate (CF 3 COO ⁇ ), tetrafluoroborate (BF 4 - ), tetrabenzylborate (B(C 6 H 5 )
- the antistatic agent (B) may contain an anion containing a sulfur atom.
- anions containing a sulfur atom are bisfluorosulfonylimide (N( SO2F ) 2- ) and bistrifluoromethanesulfonylimide (N( SO2CF3 ) 2- ).
- the antistatic agent (B) may be an organic salt. Also, the antistatic agent (B) may be a lithium salt, or a lithium organic salt containing lithium ions and organic ions as cations and anions, respectively.
- antistatic agent (B) examples include 1-ethyl-3-methylimidazolium bisfluorosulfonylimide, lithium bis(trifluoromethane)sulfonimide (LiTFSi), ethylmethylpyrrolidinium bis(trifluoromethanesulfonyl)imide (EMPTFSi) and tributylmethylammonium bis(trifluoromethanesulfonyl)imide (TBMATFSi).
- LiTFSi lithium bis(trifluoromethane)sulfonimide
- EMPTFSi ethylmethylpyrrolidinium bis(trifluoromethanesulfonyl)imide
- TBMATFSi tributylmethylammonium bis(trifluoromethanesulfonyl)imide
- the antistatic agent (B) does not have to contain phosphorus atoms. According to studies by the present inventors, the antistatic agent (B) containing phosphorus atoms tends to corrode (the conductive layer of) the touch panel.
- the adhesive composition (I) may contain one or more antistatic agents (B).
- the pressure-sensitive adhesive composition (I) may further contain an ultraviolet absorber (C) or may not contain an ultraviolet absorber (C).
- the maximum absorption wavelength in the absorption spectrum of the ultraviolet absorber (C) is 320 nm or more and 380 nm or less.
- Ultraviolet rays with a wavelength of 320 nm or less are contained in external light in a smaller amount than ultraviolet rays with a wavelength of 320 nm or more, and more are absorbed by layers located on the external light side (visible side) than the organic EL light emitting layer. Therefore, there is relatively little need to consider deterioration of the OLED due to external light.
- the absorption spectrum can be evaluated, for example, by spectrophotometric measurement of a solution in which the ultraviolet absorber (C) is dissolved in a solvent such as isopropyl alcohol at a concentration of 0.001% by weight.
- the maximum absorption wavelength in the absorption spectrum of the ultraviolet absorber (C) may be 330 nm or more and 375 nm or less, 335 nm or more and 370 nm or less, or further 340 nm or more and 370 nm or less.
- the ultraviolet absorber (C) has an absorbance of 0.1 or more, further 0.2 or more over a wavelength range of 320 nm or more and 370 nm or less in an absorption spectrum in which the absorbance is normalized to a maximum value of 1. good.
- These ultraviolet absorbers (C) are particularly suitable for suppressing deterioration of OLEDs due to ultraviolet rays.
- the amount of the ultraviolet absorber (C) is, for example, less than 15 parts by weight, 10 parts by weight or less, 7 parts by weight or less, 5 parts by weight or less, relative to 100 parts by weight of the (meth)acrylic polymer (A). 3 parts by weight or less, 2.5 parts by weight or less, 2 parts by weight or less, 1.5 parts by weight or less, 1 part by weight or less, 0.8 parts by weight or less, 0.7 parts by weight or less, 0.6 parts by weight or less, Furthermore, it may be 0.5 parts by weight or less.
- the lower limit of the blending amount is, for example, 0.1 parts by weight or more.
- the ultraviolet absorber (C) is, for example, a triazine-based ultraviolet absorber, a benzotriazole-based ultraviolet absorber, a benzophenone-based ultraviolet absorber, or an oxybenzophenone-based ultraviolet absorber, as long as the maximum absorption wavelength in the absorption spectrum is 320 nm or more and 380 nm or less. , a salicylate-based UV absorber, or a cyanoacrylate-based UV absorber.
- Each ultraviolet absorber is a compound having a triazine skeleton, a benzotriazole skeleton, a benzophenone skeleton, an oxybenzophenone skeleton, a salicylate structure, and a cyanoacrylate structure, respectively.
- the ultraviolet absorber (C) is preferably triazine-based or benzotriazole-based, more preferably triazine-based.
- the triazine-based ultraviolet absorber (C) has at least one, preferably two, more preferably three hydroxyphenyl groups and/or alkoxy (methoxy, ethoxy, propoxy, etc.) phenyl groups in one molecule. You may have In addition, the triazine-based UV absorber (C) may have at least one, preferably two hydroxyphenyl groups in one molecule.
- UV absorbers (C) especially UV absorbers (C) having three hydroxyphenyl groups and/or alkoxyphenyl groups in one molecule, have little variation in absorbance in the wavelength range of 320 nm or more and 370 nm or less. For this reason, it is particularly suitable for suppressing deterioration of OLEDs due to ultraviolet rays.
- triazine-based UV absorbers examples include 2,4-bis-[ ⁇ 4-(4-ethylhexyloxy)-4-hydroxy ⁇ -phenyl]-6-(4-methoxyphenyl)-1,3,5-triazine (Tinosorb S, manufactured by BASF), 2,4-bis[2-hydroxy-4-butoxyphenyl]-6-(2,4-dibutoxyphenyl)-1,3,5-triazine (TINUVIN 460, manufactured by BASF) , 2-(4,6-bis(2,4-dimethylphenyl)-1,3,5-triazin-2-yl)-5-hydroxyphenyl and [(C10-C16 (mainly C12-C13) alkyloxy) Reaction product with methyl]oxirane (TINUVIN400, manufactured by BASF), 2-[4,6-bis(2,4-dimethylphenyl)-1,3,5-triazin-2-yl]-5-[3- (dodecyloxy)-2-hydroxypropoxy
- benzotriazole-based UV absorbers examples include 2-(2H-benzotriazol-2-yl)-6-(1-methyl-1-phenylethyl)-4-(1,1,3,3-tetramethylbutyl ) phenol (TINUVIN 928, manufactured by BASF), 2-(2-hydroxy-5-tert-butylphenyl)-2H-benzotriazole (TINUVIN PS, manufactured by BASF), benzenepropanoic acid and 3-(2H-benzotriazole-2 -yl)-5-(1,1-dimethylethyl)-4-hydroxy (C7-9 side chain and linear alkyl) ester compound (TINUVIN384-2, BASF), 2-(2H-benzotriazole-2 -yl)-4,6-bis(1-methyl-1-phenylethyl)phenol (TINUVIN900, manufactured by BASF), methyl-3-(3-(2H-benzotriazol-2-yl)-5-t-butyl -4-hydroxy
- the adhesive composition (I) may contain one or more ultraviolet absorbers (C).
- the pressure-sensitive adhesive composition (I) may contain other additives.
- additives include cross-linking agents, silane coupling agents, colorants such as pigments and dyes, surfactants, plasticizers, tackifiers, surface lubricants, leveling agents, rework improvers, softeners, antioxidants, agents, anti-aging agents, light stabilizers, polymerization inhibitors, anti-rust agents, inorganic fillers, organic fillers, powders such as metal powders, particles, and foil-like substances.
- the rust inhibitor may be a benzotriazole-based agent (eg, BT120, BT-LX, TT-LX, manufactured by Johoku Kagaku Kogyo Co., Ltd.).
- the additive can be blended in an amount of, for example, 10 parts by weight or less, preferably 5 parts by weight or less, and more preferably 1 part by weight or less per 100 parts by weight of the (meth)acrylic polymer (A).
- cross-linking agents are organic cross-linking agents and multifunctional metal chelates.
- organic cross-linking agents are isocyanate cross-linking agents, peroxide cross-linking agents, epoxy cross-linking agents and imine cross-linking agents.
- the organic cross-linking agent and polyfunctional metal chelate can be used for both solvent-type and active energy ray-curable pressure-sensitive adhesive compositions.
- the cross-linking agent is preferably a peroxide-based cross-linking agent or an isocyanate-based cross-linking agent.
- a peroxide-based cross-linking agent and an isocyanate-based cross-linking agent may be used in combination.
- the amount thereof is, for example, 0.01 to 10 parts by weight with respect to 100 parts by weight of the (meth)acrylic polymer (A), and 0.1 to 5 parts by weight, or even 0.1 to 3 parts by weight.
- the amount thereof is, for example, 0.01 to 5 parts by weight or less with respect to 100 parts by weight of the (meth)acrylic polymer (A), and 3 Part by weight or less, 1 part by weight or less, 0.5 part by weight or less, 0.2 part by weight or less, 0.1 part by weight or less, or even 0.05 part by weight or less may be used.
- the adhesive composition (I) may not contain a silane coupling agent.
- the pressure-sensitive adhesive composition (I) may be substantially free of color-developing compounds whose maximum absorption wavelength in the absorption spectrum exceeds 380 nm.
- the maximum absorption wavelength of the color-forming compound may be 385 nm or longer, 390 nm or longer, 395 nm or longer, 400 nm or longer, 410 nm or longer, and further 420 nm or longer.
- Substantial absence of a color-developing compound having a maximum absorption wavelength in visible light can contribute to improving the color-developing performance of the OLED.
- the absorption spectrum of the color forming compound can be evaluated in the same manner as the absorption spectrum of the ultraviolet absorber (C).
- Types of the pressure-sensitive adhesive composition (I) are, for example, emulsion type, solvent type (solution type), active energy ray-curable type (light-curing type), and heat-melting type (hot-melt type).
- the pressure-sensitive adhesive composition (I) may be a solvent type from the viewpoint of forming a pressure-sensitive adhesive sheet with more excellent uniformity of properties and durability.
- a photocurable pressure-sensitive adhesive composition containing an ultraviolet absorber tends to exhibit variations in properties (eg, peel strength) between the incident side of active energy rays and the opposite side during photocuring.
- the solvent-based pressure-sensitive adhesive composition (I) may not contain a photocuring agent such as an ultraviolet curing agent.
- the adhesive sheet 1 can be formed from the adhesive composition (I) as follows.
- the pressure-sensitive adhesive composition (I) or a mixture of the pressure-sensitive adhesive composition (I) and a solvent is applied to a base film to form a coating film, and the formed coating film is dried. An adhesive sheet 1 is formed.
- the pressure-sensitive adhesive composition (I) is thermally cured by heat during drying.
- active energy ray-curable (photocurable) for example, a monomer (group) that becomes a (meth)acrylic polymer (A) by polymerization, and, if necessary, partial polymerization of the monomer (group) A mixture of substances, a polymerization initiator, an additive, a solvent, etc.
- the base film may be a film (release liner) whose coating surface has undergone a release treatment.
- the adhesive sheet 1 formed on the base film can be transferred to any member.
- the base film may be the antireflection film 2, and in this case, the antireflection film 10 with the adhesive sheet including the adhesive sheet 1 and the antireflection film 2 is obtained.
- Coating is, for example, roll coating, kiss roll coating, gravure coating, reverse coating, roll brushing, spray coating, dip roll coating, bar coating, knife coating, air knife coating, curtain coating, lip coating, extrusion coating using a die coater, or the like. can be implemented by
- the drying temperature after coating is, for example, 40 to 200°C.
- the drying temperature may be 160° C. or lower, 150° C. or lower, 130° C. or lower, 120° C. or lower, or even 100° C. or lower.
- the drying time is, for example, 5 seconds to 20 minutes, and may be 5 seconds to 10 minutes, or even 10 seconds to 5 minutes.
- the drying temperature and drying time when drying after coating may be within the above ranges.
- composition and mixture to be applied to the base film preferably have a viscosity suitable for handling and coating. Therefore, for the active energy ray-curable type, the mixture to be applied preferably contains a partial polymer of the monomer (group).
- the coated surface is treated with a silicone compound.
- the thickness of the adhesive sheet 1 is, for example, 1 to 200 ⁇ m, and may be 1 to 150 ⁇ m, 5 to 100 ⁇ m, 8 to 50 ⁇ m, 10 to 30 ⁇ m, or even 10 to 25 ⁇ m.
- the adhesive sheet 1 may have a transmittance of less than 80% for light with a wavelength of 380 nm (hereinafter referred to as T380) when the thickness is 20 ⁇ m.
- T380 a transmittance of less than 80% for light with a wavelength of 380 nm (hereinafter referred to as T380) when the thickness is 20 ⁇ m.
- the T380 of the adhesive sheet 1 having a thickness of 20 ⁇ m may be 75% or less, 70% or less, or even 65% or less.
- the lower limit of T380 is, for example, 1% or more, and may be 5% or more.
- the adhesive sheet 1 may have a substantially uniform cured state in the thickness direction. Having a substantially uniform cure state across the thickness is particularly suitable for use in OLEDs. A substantially uniform cured state can be confirmed, for example, by checking that the peel force a on one main surface of the adhesive sheet 1 is substantially the same as the peel force b on the other main surface.
- the ratio a/b of the peel force a to the peel force b is, for example, 0.5 or more and 2 or less, 0.67 or more and 1.5 or less, 0.75 or more and 1.33 or less, further 0.91 or more and 1 .1 or less.
- the peel strength (of the main surface) of the adhesive sheet 1 is, for example, the 180° peel strength evaluated by the test method specified in Method 1 of Item 10.3 of Japanese Industrial Standards (JIS) Z0237:2009. good too.
- a glass plate may be used instead of a stainless steel plate as the test plate for carrying out this test method.
- the adhesive sheet 1 may be a sheet formed from a solvent-type adhesive composition.
- a pressure-sensitive adhesive sheet formed from a solvent-based pressure-sensitive adhesive composition can have a substantially uniform cured state in the thickness direction. This can, for example, contribute to the stability of the OLED.
- the antireflection film 2 has an antireflection layer 4 and further has, for example, a transparent resin film 3 , a hard coat layer 6 , an adhesion layer 5 and an antifouling layer 7 .
- the antireflection film 2 may not have the adhesion layer 5 , the hard coat layer 6 and the antifouling layer 7 .
- a transparent resin film 3 for example, a transparent resin film 3, a hard coat layer 6, an adhesion layer 5, an antireflection layer 4 and an antifouling layer 7 are laminated in this order.
- the antireflection film 2 may have a plurality of antireflection layers 4 , and the transparent resin film 3 may be positioned between the plurality of antireflection layers 4 .
- the antireflection film 2 may further have other layers such as an antiglare layer.
- the adhesive sheet 1 is, for example, placed on the surface of the transparent resin film 3 and joined to the transparent resin film 3 .
- the adhesive sheet 1 may be arranged on the surface of the antireflection film 2 opposite to the transparent resin film 3 , that is, on the surface of the antireflection layer 4 or the antifouling layer 7 .
- the structure of the antireflection layer 4 is, for example, (i) a single layer of a low refractive index layer having an optical thickness of 120 nm to 140 nm and a refractive index of 1.35 or more and 1.50 or less, and (ii) a medium refractive index layer.
- a laminate in which the index layer, the high refractive index layer and the low refractive index layer are arranged in this order from the transparent resin film 3 side, and (iii) a multilayer laminate in which the high refractive index layer and the low refractive index layer are arranged alternately. is mentioned.
- the low refractive index layer is, for example, a layer having a refractive index of 1.35 or more and 1.50 or less.
- Materials capable of forming the high refractive index layer include, for example, titanium oxide (TiO 2 ), niobium oxide (Nb 2 O 3 or Nb 2 O 5 ), tin-doped indium oxide (ITO), antimony-doped tin oxide (ATO), ZrO 2 --TiO 2 can be mentioned.
- a high refractive index layer is, for example, a layer having a refractive index of more than 1.80 and not more than 2.20.
- Materials capable of forming the medium refractive index layer include, for example, titanium oxide (TiO 2 ), a mixture of a material capable of forming a low refractive index layer and a material capable of forming a high refractive index layer (for example, titanium oxide and oxide mixtures with silicon).
- the medium refractive index layer is, for example, a layer having a refractive index of more than 1.50 and not more than 1.80.
- each of the low refractive index layer, the medium refractive index layer, and the high refractive index layer is determined according to the layer structure of the antireflection layer 4, the desired antireflection performance, etc., so that an appropriate optical film thickness is realized. can be set.
- the thickness of the antireflection layer 4 is not particularly limited, and is, for example, 20 nm to 300 nm.
- the antireflection layer 4 can be formed, for example, by a dry process.
- dry processes include PVD (Physical Vapor Deposition) and CVD (Chemical Vapor Deposition).
- PVD methods include a vacuum deposition method, a reactive deposition method, an ion beam assist method, a sputtering method, and an ion plating method.
- CVD method there is a plasma CVD method.
- the difference between the maximum reflectance and the minimum reflectance in the wavelength range of 380 nm to 780 nm is preferably 10% or less, more preferably 7% or less, and still more preferably 5% or less.
- the difference between the maximum reflectance and the minimum reflectance is within the above range, it is easy to suppress the coloring of the reflected light.
- the transparent resin film 3 is not particularly limited, and known films can be used.
- a material for the transparent resin film 3 a material having excellent transparency, mechanical strength, thermal stability, water barrier property, isotropy, etc. is preferable.
- polyester polymers such as polyethylene terephthalate and polyethylene naphthalate; diacetylcellulose.
- Cellulose-based polymers such as triacetyl cellulose (TAC); (meth)acrylic polymers such as polymethyl methacrylate; styrene-based polymers such as polystyrene, acrylonitrile-styrene copolymer (AS resin); polycarbonate-based polymers; polyethylene, polypropylene , cycloolefin-based polymers, polyolefins having a norbornene structure, polyolefin-based polymers such as ethylene-propylene copolymers; vinyl chloride-based polymers; amide-based polymers such as nylon and aromatic polyamides; imide-based polymers; sulfone-based polymers; sulfone-based polymer; polyetheretherketone-based polymer; polyphenylene sulfide-based polymer; vinyl alcohol-based polymer; vinylidene chloride-based polymer; vinyl butyral-based polymer; arylate-based polymer; etc.
- the transparent resin film 3 may further contain an ultraviolet absorber, or may not contain an ultraviolet absorber.
- Examples of the ultraviolet absorber contained in the transparent resin film 3 include those described above for the ultraviolet absorber (C).
- the amount of the ultraviolet absorbent compounded in the transparent resin film 3 is, for example, less than 20 parts by weight, 15 parts by weight or less, 10 parts by weight or less, or 8 parts by weight with respect to 100 parts by weight of the main component (eg, TAC) of the transparent resin film 3. It may be not more than 6 parts by weight, or even not more than 6 parts by weight.
- the lower limit of the blending amount is, for example, 0.1 parts by weight or more.
- the content of the main component in the transparent resin film 3 is, for example, 50% by weight or more, and may be 60% by weight or more, 70% by weight or more, 75% by weight or more, or even 80% by weight or more.
- the thickness of the transparent resin film 3 is not particularly limited, and is preferably 3 to 200 ⁇ m in terms of strength, workability such as handleability, and thinness, and 5 to 150 ⁇ m in terms of transparency and cost. is more preferable, 10 to 100 ⁇ m is more preferable, and 20 to 25 ⁇ m may be used. It should be noted that when the thickness of the transparent resin film 3 increases, there is a tendency for the transmittance of light with a wavelength of 380 nm to decrease. From the viewpoint of reducing the transmittance for light with a wavelength of 380 nm, the thickness of the transparent resin film 3 may be 30 ⁇ m or more, or may be about 40 ⁇ m.
- the transparent resin film 3 may be a single layer, or may be composed of a plurality of layers.
- the hard coat layer 6 is formed, for example, on the surface of the transparent resin film 3 on the antireflection layer 4 side.
- the hard coat layer 6 tends to improve wear resistance and scratch resistance. Furthermore, by appropriately adjusting the difference between the refractive index of the hard coat layer 6 and the refractive index of the antireflection layer 4, the reflectance can be further reduced.
- the hard coat layer 6 preferably has sufficient surface hardness, excellent mechanical strength, and excellent light transmittance.
- the hard coat layer 6 can be made of, for example, a resin that satisfies the above properties.
- Specific examples of the resin forming the hard coat layer 6 include thermosetting resins, thermoplastic resins, ultraviolet curable resins, electron beam curable resins, and two-liquid mixed resins. From the viewpoint that the hard coat layer 6 can be formed, an ultraviolet curable resin is preferable.
- UV-curable resins include UV-curable resins such as polyester, acrylic, urethane, amide, silicone, and epoxy.
- UV-curable resins include, for example, UV-curable monomers, oligomers, and polymers.
- the UV-curable resin preferably contains an acrylic monomer component or oligomer component having two or more, preferably three to six, UV-polymerizable functional groups.
- a photopolymerization initiator is blended in the ultraviolet curable resin.
- the hard coat layer 6 may further contain metal oxide particles in addition to the resin.
- the metal oxide particles may be exposed on the surface of the hard coat layer 6, particularly on the surface of the hard coat layer 6 on the adhesion layer 5 side.
- Materials for the metal oxide particles include, for example, oxides of at least one metal selected from the group consisting of Si, Al, Ti, Zr, Ce, Mg, Zn, Ta, Sb, Sn, and Mn.
- the hard coat layer 6 can be formed, for example, by the following method. First, a resin composition for forming the hard coat layer 6 is applied onto the transparent resin film 3 to obtain a coating film. The hard coat layer 6 can be formed by drying the coating film and then curing it by irradiating it with ultraviolet rays.
- the thickness of the hard coat layer 6 is, for example, 0.5 ⁇ m to 20 ⁇ m, preferably 1 ⁇ m to 15 ⁇ m.
- the adhesion layer 5 can improve adhesion between the hard coat layer 6 and the antireflection layer 4, for example.
- the hard coat layer 6 contains metal oxide particles
- the adhesion layer 5 contains the same metal as the metal oxide particles or an oxygen-deficient metal oxide containing the metal. You can Examples of the same metal as the metal oxide particles include the metals described above for the hard coat layer 6 .
- the oxygen-deficient metal oxide means a metal oxide in which the number of oxygen atoms is less than the stoichiometric composition, specifically SiO x , AlO x , TiO x , ZrO x , CeO x .
- x in SiO x of the adhesion layer 5 is 0 or more and less than 2.0.
- the thickness of the adhesion layer is, for example, 10 nm or less, preferably 1 to 10 nm.
- the antifouling layer 7 is provided on the surface of the antireflection layer 4, for example.
- materials for the antifouling layer 7 include silane compounds containing fluorine-containing groups (for example, alkoxysilane compounds containing perfluoropolyether groups), organic compounds containing fluorine-containing groups, and the like.
- the antifouling layer 7 preferably has a water contact angle of 110° or more, which indicates water repellency.
- the antireflection film 2 can be produced by forming the antireflection layer 4 on the transparent resin film 3, for example. Before forming the antireflection layer 4, the transparent resin film 3 may be subjected to surface treatment, if necessary. Examples of surface treatment include low-pressure plasma treatment, ultraviolet irradiation treatment, corona treatment, flame treatment, acid or alkali treatment, and the like. An adhesion layer 5 made of a material such as SiO x may be formed on the surface of the transparent resin film 3 .
- the antireflection layer 4 can be formed by a dry process (eg, sputtering).
- the antireflection layer 4 including a medium refractive index layer, a high refractive index layer and a low refractive index layer in this order is formed by sputtering on the surface of the transparent resin film 3 to form a medium refractive index layer (for example, antimony-doped layer).
- a medium refractive index layer for example, antimony-doped layer.
- tin oxide film a high refractive index layer (eg Nb 2 O 5 film) and a low refractive index layer (eg SiO 2 film) in this order.
- the antireflection layer 4 in which high refractive index layers and low refractive index layers are alternately arranged is formed by sputtering on the surface of the transparent resin film 3 to form a high refractive index layer (for example, Nb 2 O 5 film).
- a low refractive index layer e.g. SiO2 film
- a high refractive index layer e.g. Nb2O5 film
- a low refractive index layer e.g. SiO2 film
- the antireflection film 2 may have an antireflection (AR) function, an antiglare (AG) function, or both functions. Among these functions, when the antireflection film 2 provided with only the AR function is used, interference unevenness may occur strongly. Therefore, the antireflection film 2 is preferably provided with both the AR function and the AG function. However, the antireflection film 2 may have only the AR function among the AR function and the AG function.
- the antireflection film 2 imparted with only the AR function can be used in an image display device having a COE (Color Filter On Encapsulation) structure. In an image display device having a COE structure, the combination of a ⁇ -cavity and a color filter increases internal light emission, thereby suppressing reflection of external light without using a polarizing plate.
- COE Color Filter On Encapsulation
- FIG. 3 Another example of the antireflection film with adhesive sheet of this embodiment is shown in FIG.
- the adhesive sheet-attached antireflection film 10B of FIG. 3 has the same structure as the adhesive sheet-attached antireflection film 10A of FIG.
- the release liner 11 is typically a resin film.
- resins that make up the release liner 11 are polyesters such as polyethylene terephthalate (PET), polyolefins such as polyethylene and polypropylene, polycarbonates, acrylics, polystyrenes, polyamides, and polyimides.
- PET polyethylene terephthalate
- the surface of the release liner 11 that contacts the adhesive sheet 1 may be subjected to a release treatment.
- the release treatment is, for example, treatment with a silicone compound.
- the release liner 11 is not limited to the above example.
- the release liner 11 is peeled off when the adhesive sheet-attached antireflection film 10B is used, for example, when attached to the image forming layer.
- the antireflection film 10 with an adhesive sheet of the present embodiment can be distributed and stored, for example, as a wound body in which a belt-like antireflection film with an adhesive sheet is wound, or as a sheet-like antireflection film with an adhesive sheet. be.
- the antireflection film 10 with an adhesive sheet of this embodiment is typically used in an image display device.
- An example of an image display device is OLED.
- the application of the antireflection film 10 with adhesive sheet is not limited to the above example.
- the antireflection film 10 with adhesive sheet of this embodiment does not contain a polarizer. With this configuration, there is a tendency to suppress reduction in luminance of light emitted from the image display device and to reduce necessary power consumption.
- the antireflection film 10 with an adhesive sheet of the present embodiment may have a transmittance (T380) of 5% or less for light with a wavelength of 380 nm.
- T380 of the antireflection film 10 with adhesive sheet may be 4% or less, further 3.5% or less.
- T380 is the transmittance of the antireflection film 10 with adhesive sheet in the stacking direction.
- the lower limit of T380 of the antireflection film 10 with adhesive sheet is, for example, 0.01% or more.
- FIG. 4 An example of the image display device of this embodiment is shown in FIG.
- the image display device 21A of FIG. 4 has a laminated structure in which a substrate 13, an image forming layer 12, an adhesive sheet 1 and an antireflection film 2 are laminated in this order.
- the image display device 21A has the adhesive sheet-attached antireflection film 10A of FIG.
- the image forming layer 12 and the substrate 13 may have the same configurations as those of the substrate and the image forming layer of a known image display device.
- the image forming layer 12 is, for example, an organic EL light emitting layer.
- Substrate 13 is typically a resin film.
- the resin constituting the substrate 13 is, for example, polyester such as PET, polyolefin such as polyethylene and polypropylene, acrylic, cycloolefin, polyimide, and polyamide, preferably polyester.
- the substrate 13 is not limited to the above example.
- Substrate 13 may be a film made of glass or a laminated film containing a film made of glass.
- An undercoat layer may be provided on the surface of the substrate 13 on the image forming layer 12 side.
- An antistatic layer may be provided on the surface of the substrate 13 opposite to the image forming layer 12 .
- Known layers can be applied to the undercoat layer and the antistatic layer. Any pressure-sensitive adhesive or adhesive can be used to bond the image forming layer 12 and the substrate 13 together.
- the adhesive sheet 1 may be used for bonding.
- FIG. 5 Another example of the image display device of this embodiment is shown in FIG.
- the image display device 21B of FIG. 5 is the same as the image display device 21A of FIG. have a configuration.
- Known layers can be applied to the touch panel 14 and the protective layer 15 .
- the touch panel 14 typically includes a conductive layer such as a metal layer.
- Protective layer 15 is typically a resin layer such as an acrylic resin layer.
- the adhesive sheet 1 is suitable for suppressing corrosion of the touch panel 14 depending on its configuration.
- the adhesive sheet 1 and the antireflection film 10 with the adhesive sheet are normally positioned closer to the external light side (visible side) than the image forming layer 12 .
- the image display devices 21A and 21B may be OLED.
- the image display devices 21A and 21B may be for mobile devices such as smart phones and smart watches.
- the image display devices 21A and 21B may be flexible image display devices that can be bent.
- the image display devices 21A and 21B may be a foldable image display device that can be folded, a rollable image display device that can be rolled up, or the like.
- the types of the image display devices 21A and 21B are not limited to the above examples.
- the image display device of this embodiment can have any configuration as long as it includes the antireflection film with an adhesive sheet of this embodiment.
- the image display device of the present embodiment does not need to have an antistatic layer on the outside light side of the image forming layer 12 .
- the image display device of this embodiment may include a transparent substrate (for example, cover glass) and a transparent adhesive (OCA: Optical Clear Adhesive) on the outside light side of the antireflection film 10 with an adhesive sheet.
- OCA Optical Clear Adhesive
- the transparent adhesive is positioned between the transparent substrate and the antireflection film 10 with adhesive sheet to join them.
- a commercial item can be used as a transparent adhesive.
- the transparent adhesive may or may not contain an ultraviolet absorber. Examples of the ultraviolet absorber contained in the transparent pressure-sensitive adhesive include those described above for the ultraviolet absorber (C).
- the amount of the ultraviolet absorber in the transparent adhesive is, for example, less than 20 parts by weight, 15 parts by weight or less, 10 parts by weight or less, 8 parts by weight or less, and further, with respect to 100 parts by weight of the main component of the transparent adhesive. It may be 6 parts by weight or less.
- the lower limit of the blending amount is, for example, 0.1 parts by weight or more.
- the content of the main component in the transparent adhesive is, for example, 50% by weight or more, and may be 60% by weight or more, 70% by weight or more, 75% by weight or more, or even 80% by weight or more.
- Tinuvin928 (benzotriazole-based) had a wide absorption range from 320 nm to 370 nm, and had an absorbance of 0.2 or more in the maximum absorption wavelength region around 349 nm.
- T380 Transmittance of light with a wavelength of 380 nm
- the antistatic ability of the pressure-sensitive adhesive sheet was evaluated as follows by producing an OLED using the pressure-sensitive adhesive sheet.
- An adhesion layer (thickness: 10 nm) made of SiO x was formed by sputtering on the surface of a TAC film manufactured by Konica Minolta (product name: KC2UA, thickness: 25 ⁇ m, containing an ultraviolet absorber). Further, on the adhesion layer, Nb2O5 film ( high refractive index layer), SiO2 film (low refractive index layer), Nb2O5 film (high refractive index layer ) and SiO2 film (low refractive index layer) layer) to form an antireflection layer (optical film thickness: 200 nm). Furthermore, an antifouling layer (thickness: 10 nm) made of an alkoxysilane compound having a perfluoropolyether group was formed on the antireflection layer to prepare an antireflection film.
- the corrosion prevention performance of the pressure-sensitive adhesive sheet for touch panels was evaluated by the following method. Assuming a touch panel, an aluminum vapor-deposited glass plate was prepared by laminating a glass plate, an aluminum layer (thickness: 0.4 ⁇ m), and an acrylic resin protective layer (thickness: 2 ⁇ m) in this order. Next, the antireflection film with adhesive sheet prepared above was attached to the acrylic resin protective layer to obtain a test sample for evaluation. Next, the specimen was left for 336 hours in a heated humidified atmosphere at a temperature of 65° C. and a relative humidity of 95%. Next, after returning the test piece to an atmosphere with a temperature of 25 ° C.
- the antireflection film with adhesive sheet was cut into a size of 3 cm ⁇ 3 cm and used.
- Table 3 below shows the evaluation results for each pressure-sensitive adhesive sheet produced.
- the antireflection films with pressure-sensitive adhesive sheets of Examples having pressure-sensitive adhesive sheets having a surface resistivity of 9 ⁇ 10 11 ⁇ / ⁇ or less ensured high antistatic performance.
- the antireflection film with adhesive sheet of the present invention is suitable for use with OLEDs.
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Abstract
Description
粘着シート及び反射防止フィルムを備えた粘着シート付き反射防止フィルムであって、
前記粘着シート付き反射防止フィルムは、偏光子を含まず、
前記粘着シートは、9×1011Ω/□以下の表面抵抗率を有する、粘着シート付き反射防止フィルムを提供する。
上記本発明の粘着シート付き反射防止フィルムを備えた、画像表示装置を提供する。
図1に示すように、本実施形態の粘着シート付き反射防止フィルム10(10A)は、粘着シート1及び反射防止フィルム2を備えており、例えば、粘着シート1及び反射防止フィルム2のみから構成されている。粘着シート1は、例えば、反射防止フィルム2の表面上に配置されており、反射防止フィルム2と接合されている。粘着シート付き反射防止フィルム10Aは、粘着シート1を介して、対象物(例えば、画像表示装置の画像形成層)と貼り合わせることが可能である。粘着シート付き反射防止フィルム10Aは、偏光子を含まない。詳細には、粘着シート付き反射防止フィルム10Aは、偏光板や円偏光板を含まない。粘着シート付き反射防止フィルム10Aは、位相差フィルムを含んでいなくてもよい。
粘着シート1は、9×1011Ω/□以下の表面抵抗率を有する。粘着シート1の表面抵抗率は、5×1011Ω/□以下、1×1011Ω/□以下、9×1010Ω/□以下、5×1010Ω/□以下、3×1010Ω/□以下、1×1010Ω/□以下、9×109Ω/□以下、5×109Ω/□以下、3×109Ω/□以下、2×109Ω/□以下、更には1×109Ω/□以下であってもよい。表面抵抗率の下限は、例えば1×107Ω/□以上である。粘着シート1の表面抵抗率は、例えば、高抵抗抵抗率計(一例として、三菱化学アナリテック製、ハイレスタシリーズ)により評価できる。
<(メタ)アクリル系ポリマー(A)>
粘着剤組成物(I)は、例えば、(メタ)アクリル系ポリマー(A)を主成分として含む。換言すれば、粘着剤組成物(I)は、アクリル系粘着剤組成物である。主成分とは、組成物において最も含有率の大きな成分を意味する。主成分の含有率は、例えば50重量%以上であり、60重量%以上、70重量%以上、75重量%以上、更には80重量%以上であってもよい。
粘着剤組成物(I)は、例えば、帯電防止剤(B)を更に含む。帯電防止剤(B)の配合量は、(メタ)アクリル系ポリマー(A)100重量部に対して、例えば10重量部未満であり、8重量部以下、7重量部以下、6重量部以下、5重量部以下、4重量部以下、3重量部以下、2重量部以下、1重量部以下、0.8重量部以下、0.6重量部以下、0.5重量部以下、0.3重量部以下、0.1重量部以下、更には0.05重量部以下であってもよい。配合量の下限は、例えば0.005重量部以上である。スマートフォン等の携帯機器に用いるOLEDを典型例として、画像表示装置の内部にタッチパネルが組み込まれることがある。画像形成層よりも視認側にタッチパネルが配置されたオンセル等も存在する。タッチパネルには、金属層等の導電層が通常含まれているが、本発明者らの検討によれば、導電層、特に金属層は、帯電防止剤(B)による腐食を受けやすい。この観点からは、帯電防止剤(B)の配合量が少ないほど、粘着剤組成物(I)はOLEDへの使用に特に適している。
粘着剤組成物(I)は、紫外線吸収剤(C)を更に含んでいてもよく、紫外線吸収剤(C)を含んでいなくてもよい。紫外線吸収剤(C)の吸収スペクトルにおける最大吸収波長は、320nm以上380nm以下にある。なお、波長320nm以下の紫外線は、波長320nm以上の紫外線に比べて外光に含まれる量が少なく、また、有機EL発光層よりも外光側(視認側)に位置する層により多くが吸収されうるため、外光によるOLEDの劣化に関して考慮の必要性が相対的に小さい。吸収スペクトルは、例えば、イソプロピルアルコール等の溶媒に濃度0.001重量%で紫外線吸収剤(C)を溶解させた溶液に対する分光光度測定により評価できる。
粘着剤組成物(I)は、その他の添加剤を含んでいてもよい。添加剤の例は、架橋剤、シランカップリング剤、顔料及び染料等の着色剤、界面活性剤、可塑剤、粘着性付与剤、表面潤滑剤、レベリング剤、リワーク向上剤、軟化剤、酸化防止剤、老化防止剤、光安定剤、重合禁止剤、防錆剤、無機充填材、有機充填材、金属粉等の粉体、粒子、箔状物である。防錆剤は、ベンゾトリアゾール系(例えば、城北化学工業製、BT120、BT-LX、TT-LX等)であってもよい。添加剤は、(メタ)アクリル系ポリマー(A)100重量部に対して、例えば10重量部以下、好ましくは5重量部以下、より好ましくは1重量部以下の範囲で配合できる。
図2に示すように、反射防止フィルム2は、反射防止層4を有し、例えば、透明樹脂フィルム3、ハードコート層6、密着層5及び防汚層7をさらに有する。反射防止フィルム2は、密着層5、ハードコート層6及び防汚層7を有していなくてもよい。反射防止フィルム2では、例えば、透明樹脂フィルム3、ハードコート層6、密着層5、反射防止層4及び防汚層7がこの順に積層されている。反射防止フィルム2は、複数の反射防止層4を有し、複数の反射防止層4の間に透明樹脂フィルム3が位置していてもよい。反射防止フィルム2は、防眩層などの他の層をさらに有していてもよい。
反射防止層4の構成としては、例えば、(i)光学膜厚が120nm~140nmであり、屈折率が1.35以上1.50以下である低屈折率層の単一層、(ii)中屈折率層、高屈折率層及び低屈折率層が、透明樹脂フィルム3側からこの順に並んでいる積層体、及び(iii)高屈折率層及び低屈折率層が交互に並んでいる多層積層体が挙げられる。(ii)中屈折率層、高屈折率層及び低屈折率層をこの順で含む積層体の詳細は、例えば、特開2018-173447号公報に開示されている。(iii)高屈折率層及び低屈折率層が交互に並んでいる多層積層体の詳細は、例えば、特開2017-227898号公報に開示されている。多層積層体において、高屈折率層の数と低屈折率層の数との合計値は、特に限定されず、例えば2~10である。
透明樹脂フィルム3は、特に限定されず、公知のフィルムを使用できる。透明樹脂フィルム3の材料としては、透明性、機械的強度、熱安定性、水分遮断性、等方性などに優れるものが好ましく、例えば、ポリエチレンテレフタレート、ポリエチレンナフタレートなどのポリエステル系ポリマー;ジアセチルセルロース、トリアセチルセルロース(TAC)などのセルロース系ポリマー;ポリメチルメタクリレートなどの(メタ)アクリル系ポリマー;ポリスチレン、アクリロニトリル・スチレン共重合体(AS樹脂)などのスチレン系ポリマー;ポリカーボネート系ポリマー;ポリエチレン、ポリプロピレン、シクロオレフィン系ポリマー、ノルボルネン構造を有するポリオレフィン、エチレン・プロピレン共重合体などのポリオレフィン系ポリマー;塩化ビニル系ポリマー;ナイロン、芳香族ポリアミドなどのアミド系ポリマー;イミド系ポリマー;スルホン系ポリマー;ポリエーテルスルホン系ポリマー;ポリエーテルエーテルケトン系ポリマー;ポリフェニレンスルフィド系ポリマー;ビニルアルコール系ポリマー;塩化ビニリデン系ポリマー;ビニルブチラール系ポリマー;アリレート系ポリマー;ポリオキシメチレン系ポリマー;エポキシ系ポリマー;これらのポリマーの混合物などが挙げられる。透明樹脂フィルム3は、TACフィルムであることが好ましい。
ハードコート層6は、例えば、透明樹脂フィルム3の反射防止層4側の表面に形成されている。ハードコート層6によれば、耐摩耗性や耐スクラッチ性が向上する傾向がある。さらに、ハードコート層6の屈折率と反射防止層4の屈折率との差を適切に調整することにより、反射率をさらに低下させることができる。
密着層5は、例えば、ハードコート層6と反射防止層4との密着性を向上することができる。反射防止フィルム2では、ハードコート層6が金属酸化物粒子を含み、かつ、密着層5が、当該金属酸化物粒子と同じ金属、又は、当該金属を有する酸素欠損状態の金属酸化物を含んでいてもよい。金属酸化物粒子と同じ金属としては、例えば、ハードコート層6について上述した金属が挙げられる。酸素欠損状態の金属酸化物は、化学量論組成よりも酸素原子の数が不足した状態の金属酸化物を意味し、具体的には、SiOx、AlOx、TiOx、ZrOx、CeOx、MgOx、ZnOx、TaOx、SbOx、SnOx、MnOx(xは0以上化学量論量未満)などが挙げられる。例えば、ハードコート層6に含まれる金属酸化物粒子がSiO2である場合、密着層5のSiOxにおけるxは、0以上2.0未満である。
防汚層7は、例えば、反射防止層4の表面上に設けられる。防汚層7の材料としては、例えば、フッ素含有基を含むシラン系化合物(例えば、パーフルオロポリエーテル基を有するアルコキシシラン化合物)、フッ素含有基を含む有機化合物などが挙げられる。防汚層7において、撥水性を示す水接触角が110°以上であることが好ましい。
反射防止フィルム2は、例えば、透明樹脂フィルム3に反射防止層4を形成することによって作製することができる。反射防止層4を形成する前において、透明樹脂フィルム3には、必要に応じて、表面処理が施されてもよい。表面処理としては、例えば、低圧プラズマ処理、紫外線照射処理、コロナ処理、火炎処理、酸又はアルカリ処理などが挙げられる。透明樹脂フィルム3の表面上には、SiOxなどの材料からなる密着層5が形成されていてもよい。
反射防止フィルム2は、アンチリフレクション(AR)機能、アンチグレア(AG)機能、又はこれらの両方の機能を有していてもよい。これらの機能のうち、AR機能のみが付与された反射防止フィルム2を用いた場合、干渉ムラが強く生じることがある。そのため、反射防止フィルム2は、AR機能及びAG機能の両方が付与されていることが好ましい。ただし、反射防止フィルム2は、AR機能及びAG機能のうち、AR機能のみが付与されていてもよい。AR機能のみが付与された反射防止フィルム2は、COE(Color filter On Encapsulation)構造を有する画像表示装置に用いられうる。COE構造を有する画像表示装置では、μキャビティとカラーフィルターの組み合わせにより内部発光を増加させ、これにより、偏光板を使用せずに外光の反射を抑制する。
本実施形態の粘着シート付き反射防止フィルムの別の一例を図3に示す。図3の粘着シート付き反射防止フィルム10Bは、粘着シート1に接合されたはく離ライナー11を更に含む以外は、図1の粘着シート付き反射防止フィルム10Aと同様の構造を有する。
本実施形態の画像表示装置の一例を図4に示す。図4の画像表示装置21Aは、基板13、画像形成層12、粘着シート1及び反射防止フィルム2がこの順に積層された積層構造を有している。画像表示装置21Aは、図1の粘着シート付き反射防止フィルム10Aを有している。画像形成層12及び基板13は、公知の画像表示装置が備える基板及び画像形成層と、それぞれ同様の構成を有していればよい。画像形成層12は、例えば、有機EL発光層である。基板13は、典型的には、樹脂フィルムである。基板13を構成する樹脂は、例えば、PET等のポリエステル、ポリエチレン及びポリプロピレン等のポリオレフィン、アクリル、シクロオレフィン、ポリイミド、並びにポリアミドであり、ポリエステルが好ましい。ただし、基板13は上記例に限定されない。基板13は、ガラス製のフィルム、又はガラス製のフィルムを含む積層フィルムであってもよい。基板13の画像形成層12側の面には、下塗層が設けられていてもよい。基板13の画像形成層12とは反対側の面には、帯電防止層が設けられていてもよい。下塗層及び帯電防止層には、公知の層を適用できる。画像形成層12と基板13との接合には、任意の粘着剤や接着剤を使用できる。粘着シート1を接合に使用してもよい。
BA:n-ブチルアクリルレート
AA:アクリル酸
HBA:4-ヒドロキシブチルアクリレート
NVP:N-ビニルピロリドン
PEA:フェノキシエチルアクリレート
MEA:メトキシエチルアクリレート
ACMO:アクリロイルモルフォリン
AIBN:2,2’-アゾビスイソブチロニトリル
LiTFSi:リチウムビス(トリフルオロメタンスルホニル)イミド
AS110:1-エチル-3-メチルイミダゾリウムビス(フルオロスルホニル)イミド(第一工業製薬製、エレクセルAS-110)
Tinosorb S:2,4-ビス-[{4-(4-エチルヘキシルオキシ)-4-ヒドロキシ}-フェニル]-6-(4-メトキシフェニル)-1,3,5-トリアジン(BASFジャパン製)
Tinuvin 928:2-(2H-ベンゾトリアゾール-2-イル)-6-(1-メチル-1-フェニルエチル)-4-(1,1,3,3-テトラメチルブチル)フェノール(BASFジャパン製)
C/L:トリメチロールプロパン/トリレンジイソシアネート3量体付加物(イソシアネート系架橋剤;東ソー製、コロネートL)
X-41-1810:シランカップリング剤(信越化学工業製)
X-41-1056:シランカップリング剤(信越化学工業製)
(合成例1)
撹拌羽根、温度計、窒素ガス導入管、及び冷却器を備えた4つ口フラスコに、BA99.0重量部及びHBA1.0重量部を仕込んだ。次に、BA及びHBAの混合物100重量部に対して、重合開始剤としてAIBN0.1重量部を加え、緩やかに撹拌しながら窒素ガスを導入してフラスコ内を窒素置換した後、フラスコ内の液温を55℃付近に保って重合反応を7時間進行させた。次に、得られた反応液に酢酸エチルを加えて固形分濃度12重量%に調整して、(メタ)アクリル系ポリマー(A-1)の溶液を得た。
使用する単量体及びその仕込み量を以下の表1に示す種類及び量とした以外は、合成例1と同様にして、(メタ)アクリル系ポリマー(A-2)~(A-5)の溶液を得た。
(実施例1~14、比較例1~3)
以下の表2に示すように(メタ)アクリル系ポリマー(A)の固形分100重量部に対して帯電防止剤(B)、紫外線吸収剤(C)及び架橋剤を混合して、溶剤型の粘着剤組成物を得た。紫外線吸収剤(C)に用いたTinosorb S(トリアジン系)は、1分子中に2個のヒドロキシフェニル基と1個のアルコキシフェニル基とを有すると共に、346nm付近の最大吸収波長域において0.55以上の吸光度を有していた。また、Tinuvin928(ベンゾトリアゾール系)は、320nm以上370nm以下にわたって広く吸収を持つと共に、349nm付近の最大吸収波長域において0.2以上の吸光度を有していた。
一方のはく離ライナーを剥がして、粘着シートをガラス板の表面に接合させた。次に、他方のはく離ライナーを剥がした後、紫外可視光分光光度計(大塚電子製、LPF-200)を用いて、粘着シートの厚さ方向のT380を評価した。T380の評価では、予め測定しておいた波長380nmの光に対するガラス板(厚さ方向)の透過率をベースラインとする補正を実施した。
一方のはく離ライナーを剥がして室内(温度25±5℃、相対湿度50±10%)で1分間放置した後、露出面の表面抵抗率を高抵抗抵抗率計(三菱化学アナリテック製、ハイレスタMCP-HT450)を用いて評価した。
粘着シートの帯電抑制能は、当該粘着シートを用いてOLEDを作製し、以下のように評価した。
コニカミノルタ社製のTACフィルム(製品名:KC2UA、厚さ:25μm、紫外線吸収剤を含有)の表面上に、SiOxからなる密着層(厚さ:10nm)をスパッタリングにより形成した。さらに、当該密着層の上に、Nb2O5膜(高屈折率層)、SiO2膜(低屈折率層)、Nb2O5膜(高屈折率層)及びSiO2膜(低屈折率層)を順次製膜することによって、反射防止層(光学膜厚:200nm)を形成した。さらに、反射防止層上に、パーフルオロポリエーテル基を有するアルコキシシラン化合物からなる防汚層(厚さ:10nm)を形成し、反射防止フィルムを作製した。
次に、得られた反射防止フィルムについて、TACフィルムの表面(密着層とは反対側の表面)に、作製した粘着シートを貼り付けた。これにより、粘着シート付き反射防止フィルムを作製した。
有機EL発光層、粘着シート付き反射防止フィルム、透明粘着剤及びカバーガラス(コーニング製、ゴリラガラス(0.7t))をこの順に積層して評価用のOLED(表示部が縦70mm×横160mmの長方形)を得た。
作製したOLEDの表示部に黒色を表示させた状態で、最表面に位置するカバーガラスの周縁を黄銅棒(直径7-8mmの円柱形状)により8時間こすり続けた。黄銅棒は、100gfの力をかけながら、速度100mm/秒にて、カバーガラスの周縁を繰り返し周回させた。8時間の経過後、OLEDの表示部を目視により観察し、緑色の発光が観察されなかった場合をA(良)、観察された場合をC(不可)とした。
作製したOLEDに対してキセノンアーク試験を実施し、試験の前後におけるOLEDの白色表示輝度の劣化の有無を目視により確認した。紫外線は、最表面に位置するカバーガラス側から照射した。試験の前後において表示輝度の劣化が見られなかった場合をA、劣化が見られた場合をCとした。キセノンアーク試験は、卓上キセノンアークランプ式促進耐光性試験機(ATLAS製、SUNTEST XLS+)を用いて、UV露光量95400kJ/m2で実施した。
タッチパネルに対する粘着シートの腐食防止性能は、以下の方法により評価した。タッチパネルを想定した、ガラス板、アルミ層(厚さ0.4μm)及びアクリル樹脂保護層(厚さ2μm)がこの順に積層されたアルミ蒸着ガラス板を準備した。次に、アクリル樹脂保護層に、上記で作製した粘着シート付き反射防止フィルムを貼り付け、評価用の試験体を得た。次に、温度65℃及び相対湿度95%の加熱加湿雰囲気に試験体を336時間放置した。次に、温度25℃及び相対湿度50%の雰囲気に試験体を戻した後、点灯させたバックライトの上に戴置し、アルミ層の腐食の状態を目視により確認して、粘着シートの腐食防止性能を評価した。粘着シート付き反射防止フィルムは、3cm×3cmのサイズに切り出して使用した。
A(良):腐食がみられない。
B(可):腐食はみられるが、腐食された領域の最大径は1mm未満である。
C(不可):最大径1mm以上の腐食された領域がみられる。
Claims (8)
- 粘着シート及び反射防止フィルムを備えた粘着シート付き反射防止フィルムであって、
前記粘着シート付き反射防止フィルムは、偏光子を含まず、
前記粘着シートは、9×1011Ω/□以下の表面抵抗率を有する、粘着シート付き反射防止フィルム。 - 前記粘着シートは、前記反射防止フィルムの表面上に配置されている、請求項1に記載の粘着シート付き反射防止フィルム。
- 前記粘着シートは、(メタ)アクリル系ポリマーを含む粘着剤組成物から形成されたシートである、請求項1又は2に記載の粘着シート付き反射防止フィルム。
- 前記粘着シートは、溶剤型の粘着剤組成物から形成されたシートである、請求項1~3のいずれか1項に記載の粘着シート付き反射防止フィルム。
- 前記粘着シートは、帯電防止剤を含む、請求項1~4のいずれか1項に記載の粘着シート付き反射防止フィルム。
- 有機エレクトロルミネッセンス表示装置用である、請求項1~5のいずれか1項に記載の粘着シート付き反射防止フィルム。
- 請求項1~6のいずれか1項に記載の粘着シート付き反射防止フィルムを備えた、画像表示装置。
- 前記画像表示装置が、有機エレクトロルミネッセンス表示装置である、請求項7に記載の画像表示装置。
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