JP7384964B2 - Adhesive sheet for displays and displays including the same - Google Patents
Adhesive sheet for displays and displays including the same Download PDFInfo
- Publication number
- JP7384964B2 JP7384964B2 JP2022098710A JP2022098710A JP7384964B2 JP 7384964 B2 JP7384964 B2 JP 7384964B2 JP 2022098710 A JP2022098710 A JP 2022098710A JP 2022098710 A JP2022098710 A JP 2022098710A JP 7384964 B2 JP7384964 B2 JP 7384964B2
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- Prior art keywords
- adhesive
- film
- display
- oca
- adhesive sheet
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- 230000001070 adhesive effect Effects 0.000 title claims description 130
- 239000000853 adhesive Substances 0.000 title claims description 128
- 230000003287 optical effect Effects 0.000 claims description 49
- 239000003999 initiator Substances 0.000 claims description 37
- 239000000203 mixture Substances 0.000 claims description 29
- 238000011417 postcuring Methods 0.000 claims description 25
- 238000004519 manufacturing process Methods 0.000 claims description 22
- 239000003431 cross linking reagent Substances 0.000 claims description 20
- 239000004925 Acrylic resin Substances 0.000 claims description 19
- 229920000178 Acrylic resin Polymers 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 18
- WGXGKXTZIQFQFO-CMDGGOBGSA-N ethenyl (e)-3-phenylprop-2-enoate Chemical compound C=COC(=O)\C=C\C1=CC=CC=C1 WGXGKXTZIQFQFO-CMDGGOBGSA-N 0.000 claims description 11
- 230000001678 irradiating effect Effects 0.000 claims description 7
- 239000004971 Cross linker Substances 0.000 claims description 5
- 239000002313 adhesive film Substances 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 4
- 239000010408 film Substances 0.000 description 64
- 238000001723 curing Methods 0.000 description 16
- 239000000463 material Substances 0.000 description 10
- VFHVQBAGLAREND-UHFFFAOYSA-N diphenylphosphoryl-(2,4,6-trimethylphenyl)methanone Chemical compound CC1=CC(C)=CC(C)=C1C(=O)P(=O)(C=1C=CC=CC=1)C1=CC=CC=C1 VFHVQBAGLAREND-UHFFFAOYSA-N 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- PSGCQDPCAWOCSH-UHFFFAOYSA-N (4,7,7-trimethyl-3-bicyclo[2.2.1]heptanyl) prop-2-enoate Chemical compound C1CC2(C)C(OC(=O)C=C)CC1C2(C)C PSGCQDPCAWOCSH-UHFFFAOYSA-N 0.000 description 6
- XLPJNCYCZORXHG-UHFFFAOYSA-N 1-morpholin-4-ylprop-2-en-1-one Chemical compound C=CC(=O)N1CCOCC1 XLPJNCYCZORXHG-UHFFFAOYSA-N 0.000 description 6
- GOXQRTZXKQZDDN-UHFFFAOYSA-N 2-Ethylhexyl acrylate Chemical compound CCCCC(CC)COC(=O)C=C GOXQRTZXKQZDDN-UHFFFAOYSA-N 0.000 description 6
- XMLYCEVDHLAQEL-UHFFFAOYSA-N 2-hydroxy-2-methyl-1-phenylpropan-1-one Chemical compound CC(C)(O)C(=O)C1=CC=CC=C1 XMLYCEVDHLAQEL-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 4
- 238000007259 addition reaction Methods 0.000 description 4
- 238000004132 cross linking Methods 0.000 description 4
- PBOSTUDLECTMNL-UHFFFAOYSA-N lauryl acrylate Chemical compound CCCCCCCCCCCCOC(=O)C=C PBOSTUDLECTMNL-UHFFFAOYSA-N 0.000 description 4
- 229920000139 polyethylene terephthalate Polymers 0.000 description 4
- 239000005020 polyethylene terephthalate Substances 0.000 description 4
- 238000007363 ring formation reaction Methods 0.000 description 4
- OMIGHNLMNHATMP-UHFFFAOYSA-N 2-hydroxyethyl prop-2-enoate Chemical compound OCCOC(=O)C=C OMIGHNLMNHATMP-UHFFFAOYSA-N 0.000 description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000000178 monomer Substances 0.000 description 3
- 229920001296 polysiloxane Polymers 0.000 description 3
- KWVGIHKZDCUPEU-UHFFFAOYSA-N 2,2-dimethoxy-2-phenylacetophenone Chemical compound C=1C=CC=CC=1C(OC)(OC)C(=O)C1=CC=CC=C1 KWVGIHKZDCUPEU-UHFFFAOYSA-N 0.000 description 2
- GJKGAPPUXSSCFI-UHFFFAOYSA-N 2-Hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone Chemical compound CC(C)(O)C(=O)C1=CC=C(OCCO)C=C1 GJKGAPPUXSSCFI-UHFFFAOYSA-N 0.000 description 2
- UHFFVFAKEGKNAQ-UHFFFAOYSA-N 2-benzyl-2-(dimethylamino)-1-(4-morpholin-4-ylphenyl)butan-1-one Chemical compound C=1C=C(N2CCOCC2)C=CC=1C(=O)C(CC)(N(C)C)CC1=CC=CC=C1 UHFFVFAKEGKNAQ-UHFFFAOYSA-N 0.000 description 2
- PCKZAVNWRLEHIP-UHFFFAOYSA-N 2-hydroxy-1-[4-[[4-(2-hydroxy-2-methylpropanoyl)phenyl]methyl]phenyl]-2-methylpropan-1-one Chemical compound C1=CC(C(=O)C(C)(O)C)=CC=C1CC1=CC=C(C(=O)C(C)(C)O)C=C1 PCKZAVNWRLEHIP-UHFFFAOYSA-N 0.000 description 2
- LWRBVKNFOYUCNP-UHFFFAOYSA-N 2-methyl-1-(4-methylsulfanylphenyl)-2-morpholin-4-ylpropan-1-one Chemical compound C1=CC(SC)=CC=C1C(=O)C(C)(C)N1CCOCC1 LWRBVKNFOYUCNP-UHFFFAOYSA-N 0.000 description 2
- RIWRBSMFKVOJMN-UHFFFAOYSA-N 2-methyl-1-phenylpropan-2-ol Chemical compound CC(C)(O)CC1=CC=CC=C1 RIWRBSMFKVOJMN-UHFFFAOYSA-N 0.000 description 2
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 2
- 238000003848 UV Light-Curing Methods 0.000 description 2
- 125000000217 alkyl group Chemical group 0.000 description 2
- RWCCWEUUXYIKHB-UHFFFAOYSA-N benzophenone Chemical compound C=1C=CC=CC=1C(=O)C1=CC=CC=C1 RWCCWEUUXYIKHB-UHFFFAOYSA-N 0.000 description 2
- 239000012965 benzophenone Substances 0.000 description 2
- MQDJYUACMFCOFT-UHFFFAOYSA-N bis[2-(1-hydroxycyclohexyl)phenyl]methanone Chemical compound C=1C=CC=C(C(=O)C=2C(=CC=CC=2)C2(O)CCCCC2)C=1C1(O)CCCCC1 MQDJYUACMFCOFT-UHFFFAOYSA-N 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000006082 mold release agent Substances 0.000 description 2
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- -1 tackifiers Substances 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 2
- QNODIIQQMGDSEF-UHFFFAOYSA-N (1-hydroxycyclohexyl)-phenylmethanone Chemical compound C=1C=CC=CC=1C(=O)C1(O)CCCCC1 QNODIIQQMGDSEF-UHFFFAOYSA-N 0.000 description 1
- 239000012956 1-hydroxycyclohexylphenyl-ketone Substances 0.000 description 1
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- GJIIAJVOYIPUPY-UHFFFAOYSA-N 2-methylidenebut-3-enoic acid Chemical compound OC(=O)C(=C)C=C GJIIAJVOYIPUPY-UHFFFAOYSA-N 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- FIYZNAKNHICPGB-UHFFFAOYSA-N [PH3]=O.C1(=CC=CC=C1)C=1C(=C(C(=C(C1C)C(=O)C(O)C1=CC=CC=C1)C)C1=CC=CC=C1)C Chemical compound [PH3]=O.C1(=CC=CC=C1)C=1C(=C(C(=C(C1C)C(=O)C(O)C1=CC=CC=C1)C)C1=CC=CC=C1)C FIYZNAKNHICPGB-UHFFFAOYSA-N 0.000 description 1
- 150000001252 acrylic acid derivatives Chemical class 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000002318 adhesion promoter Substances 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 125000003236 benzoyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C(*)=O 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000006352 cycloaddition reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 125000003438 dodecyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 125000003055 glycidyl group Chemical group C(C1CO1)* 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- YLHXLHGIAMFFBU-UHFFFAOYSA-N methyl phenylglyoxalate Chemical compound COC(=O)C(=O)C1=CC=CC=C1 YLHXLHGIAMFFBU-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001151 other effect Effects 0.000 description 1
- AUONHKJOIZSQGR-UHFFFAOYSA-N oxophosphane Chemical compound P=O AUONHKJOIZSQGR-UHFFFAOYSA-N 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000006254 rheological additive Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 238000009281 ultraviolet germicidal irradiation Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Images
Classifications
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- 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
- C09J4/00—Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16
- C09J4/06—Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09J159/00 - C09J187/00
-
- 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
- C08K5/00—Use of organic ingredients
- C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
- C08K5/0025—Crosslinking or vulcanising agents; including accelerators
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—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
- C09J11/06—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
- C09J133/04—Homopolymers or copolymers of esters
-
- 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
- C09J7/10—Adhesives in the form of films or foils without carriers
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
-
- 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
-
- 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
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
- C09J2301/312—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier parameters being the characterizing feature
-
- 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
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
- C09J2301/416—Additional features of adhesives in the form of films or foils characterized by the presence of essential components use of irradiation
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Physics & Mathematics (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Adhesive Tapes (AREA)
Description
本発明は、ディスプレイ用接着シート及びこの製造方法に関する。より具体的には、ディスプレイの段差（ｓｔｅｐ）又は屈曲への接着にも優れる、光学用透明接着（ＯＣＡ）フィルムを含む接着シート及びこの製造方法に関する。 The present invention relates to an adhesive sheet for displays and a method for manufacturing the same. More specifically, the present invention relates to an adhesive sheet containing an optical clear adhesive (OCA) film that has excellent adhesion to steps or bends in a display, and a method for producing the same.
ディスプレイを製造するためのパネル素材を組立てるために使用される部材である接着フィルムには、ディスプレイモジュールが発光する際に、これを透過させ得るように光学用透明接着（ＯＣＡ）フィルムが使用される。 Optical clear adhesive (OCA) film is used for the adhesive film, which is a member used to assemble panel materials for manufacturing displays, to allow light to pass through when the display module emits light. .
一方、最近、情報通信技術の飛躍的な発展並びに市場の膨脹によって、ディスプレイとして、曲げ性のあるディスプレイが様々な用途と適用可能性により、脚光を浴びている。 On the other hand, recently, with the rapid development of information and communication technology and the expansion of the market, flexible displays have been attracting attention due to their various uses and applicability.
段差又は屈曲のある部分が存在するディスプレイにおいて、パネル素材を組立てるために使用される部材である接着シートは、ディスプレイの段差又は屈曲にも浮き上がる現象なく、接着に優れるものが求められている。 In a display that has a stepped or curved portion, an adhesive sheet, which is a member used to assemble the panel material, is required to have excellent adhesion without lifting even when the display is stepped or bent.
本発明は、ディスプレイの段差又は屈曲のある部分にも浮き上がる現象なく、接着に優れる、光学用透明接着（ＯＣＡ）フィルムを含むディスプレイ用接着シートを提供することを目的とする。 An object of the present invention is to provide an adhesive sheet for a display including an optical transparent adhesive (OCA) film that has excellent adhesion and does not come up even on stepped or curved portions of the display.
また、本発明によるディスプレイ用接着シートの製造方法を提供することを目的とする。 Another object of the present invention is to provide a method for manufacturing an adhesive sheet for displays according to the present invention.
また、本発明によるディスプレイ用接着シートを用いてディスプレイパネル（ｐａｎｅｌ）を製造する方法を提供することを目的とする。 Another object of the present invention is to provide a method for manufacturing a display panel using the display adhesive sheet according to the present invention.
また、本発明によるディスプレイ用接着シートを含むディスプレイを提供することを目的とする。 Another object of the present invention is to provide a display including the display adhesive sheet according to the present invention.
本発明の目的は、以上に言及した目的に制限されず、言及していない本発明の他の目的及び長所は、下記の説明によって理解することができ、本発明の実施例によってより明らかに理解される。また、本発明の目的及び長所は、特許請求の範囲に示した手段及びその組み合わせによって実現できることが分かりやすい。 The objects of the present invention are not limited to the objects mentioned above, and other objects and advantages of the invention not mentioned can be understood by the following description and more clearly by the embodiments of the invention. be done. Further, it is easy to understand that the objects and advantages of the present invention can be realized by the means shown in the claims and the combinations thereof.
上述した技術的課題を解決するために、本発明の一態様によるディスプレイ用接着シートは、アクリル系樹脂、ＵＶ開始剤、および後硬化（ｐｏｓｔ－ｃｕｒｅ）架橋剤を含む、接着組成物の硬化物である光学用透明接着（ＯＣＡ）フィルムを含み、前記後硬化架橋剤は、ケイ皮酸ビニル（ｖｉｎｙｌ ｃｉｎｎａｍａｔｅ）を含むことができる。前記光学用透明接着（ＯＣＡ）フィルムは、Ｂ－ステージ（Ｂ－ｓｔａｇｅ）状態であってもよい。前記光学用透明接着（ＯＣＡ）フィルムは、紫外線（ＵＶ）硬化前の６０℃及び１Ｈｚでのモデュラス（ｍｏｄｕｌｕｓ）が１０４Ｐａ～１０５Ｐａであり、紫外線（ＵＶ）硬化後の６０℃及び１Ｈｚでのモデュラスが１０５Ｐａ～１０６Ｐａであってもよい。 In order to solve the above-mentioned technical problems, an adhesive sheet for display according to one embodiment of the present invention is a cured product of an adhesive composition containing an acrylic resin, a UV initiator, and a post-cure crosslinking agent. The post-curing crosslinking agent may include vinyl cinnamate. The optical clear adhesive (OCA) film may be in a B-stage state. The optical clear adhesive (OCA) film has a modulus of 10 4 Pa to 10 5 Pa at 60° C. and 1 Hz before UV curing, and a modulus of 10 4 Pa to 10 5 Pa at 60° C. and 1 Hz after UV curing. The modulus at may be 10 5 Pa to 10 6 Pa.
本発明の一態様によるディスプレイ用接着シートの製造方法は、アクリル系樹脂、ＵＶ開始剤、および後硬化架橋剤を混合して、接着組成物を得るステップと、第１離型フィルム上に、前記接着組成物を塗布した後、その上に第２離型フィルムを配置して、接着シート構造体を形成するステップと、前記形成された接着シート構造体に青色ＬＥＤランプを照射して、仮硬化（ｐｒｅ－ｈａｒｄｅｎｉｎｇ）し、前記塗布された接着組成物をＢ－ステージ（Ｂ－ｓｔａｇｅ）状態の光学用透明接着（ＯＣＡ）フィルムで形成するステップと、を含み、前記後硬化架橋剤は、ケイ皮酸ビニル（ｖｉｎｙｌ ｃｉｎｎａｍａｔｅ）を含むことができる。 A method for manufacturing an adhesive sheet for displays according to one aspect of the present invention includes the steps of: mixing an acrylic resin, a UV initiator, and a post-curing crosslinking agent to obtain an adhesive composition; After applying the adhesive composition, a second release film is placed thereon to form an adhesive sheet structure, and a blue LED lamp is irradiated to the formed adhesive sheet structure to temporarily cure the adhesive composition. pre-hardening the applied adhesive composition to form a B-stage optical clear adhesive (OCA) film, wherein the post-curing crosslinker is Vinyl cinnamate may be included.
本発明の一態様によるディスプレイパネル（ｐａｎｅｌ）の製造方法は、前記ディスプレイ用接着シートから、前記光学用透明接着（ＯＣＡ）フィルムを抽出するステップと、一以上のディスプレイ部材上に、前記光学用透明接着（ＯＣＡ）フィルムを配置するステップと、前記光学用透明接着（ＯＣＡ）フィルムに紫外線（ＵＶ）を照射して、後硬化（ｐｏｓｔ－ｃｕｒｅ）するステップと、を含むことができる。前記一以上のディスプレイ部材は、段差（ｓｔｅｐ）又は屈曲を有してもよく、前記後硬化するステップによって、前記光学用接着フィルムが、前記段差又は屈曲に一致して接着されてもよい。 A method for manufacturing a display panel according to one aspect of the present invention includes the steps of: extracting the optical clear adhesive (OCA) film from the display adhesive sheet; and applying the optical clear adhesive (OCA) film on one or more display members. The method may include disposing an optically transparent adhesive (OCA) film, and post-curing the optically transparent adhesive (OCA) film by irradiating the optically transparent adhesive (OCA) film with ultraviolet (UV) light. The one or more display members may have a step or a bend, and the optical adhesive film may be adhered in accordance with the step or bend by the post-curing step.
本発明の一態様によるディスプレイは、本発明のディスプレイ用接着シートを含むことができる。 A display according to one aspect of the present invention can include the display adhesive sheet of the present invention.
本発明のディスプレイ用接着シートは、後硬化架橋剤を含むＢ－ステージ（Ｂ－ｓｔａｇｅ）状態の光学用透明接着（ＯＣＡ）フィルムを含み、前記光学用透明接着（ＯＣＡ）フィルムは、紫外線（ＵＶ）を照射して、後硬化（ａｆｔｅｒ－ｃｕｒｅ）するステップによって、モデュラス（ｍｏｄｕｌｕｓ）が増加するため、ディスプレイの段差又は屈曲のある部分にも浮き上がる現象なく、接着に優れる。 The display adhesive sheet of the present invention includes a B-stage optical clear adhesive (OCA) film containing a post-curing crosslinking agent, and the optical clear adhesive (OCA) film is UV resistant. ) The modulus is increased by the step of after-curing by irradiating the adhesive, so there is no lifting phenomenon even on stepped or curved parts of the display, and the adhesion is excellent.
本発明の効果は、以上に言及した効果に制限されず、言及していないさらに他の効果は、下記の記載から当業者にとって明確に理解される。上述した効果並びに本発明の具体的な効果は、以下の発明を実施するための具体的な事項を説明すると共に記述する。 The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the following description. The above-mentioned effects and specific effects of the present invention will be described together with the following specific matters for carrying out the invention.
前述した目的、特徴及び長所は、添付の図面を参照して詳細に後述され、これによって、本発明の属する技術分野における通常の知識を有する者は、本発明の技術思想を容易に実施することができる。本発明を説明することにおいて、本発明に系る公知技術に対する具体的な説明が、本発明の要旨を曖昧にすると判断される場合には詳細な説明を省略する。以下では、添付の図面を参照して、本発明による好ましい実施例を詳説することとする。図面における同じ参照符号は、同一又は類似の構成要素を示すために使われる。 The above-mentioned objects, features and advantages will be described in detail below with reference to the accompanying drawings, so that those with ordinary knowledge in the technical field to which the present invention pertains will be able to easily carry out the technical idea of the present invention. Can be done. In explaining the present invention, detailed explanations of known techniques related to the present invention will be omitted if it is determined that such explanations would obscure the gist of the present invention. In the following, preferred embodiments of the invention will be explained in detail with reference to the accompanying drawings. The same reference numbers in the drawings are used to indicate the same or similar elements.
本明細書における構成要素の「上部（又は下部）」又は構成要素の「上（又は下）」に任意の構成が配されるということは、任意の構成が上記構成要素の上面（又は下面）に接して配されるだけでなく、上記構成要素と、上記構成要素上に（又は下に）配された任意の構成との間に他の構成が介在し得ることを意味する。 In this specification, an arbitrary structure is placed on the "upper (or lower)" side of a component or "above (or below)" a component, which means that any structure is placed on the upper (or lower) surface of the component. In addition to being disposed adjacent to the component, it is meant that other configurations may be interposed between the component and any configuration disposed above (or below) the component.
本明細書で使われる単数の表現は、文脈上明白に他に意味しない限り、複数の表現を含む。本出願における「構成される」又は「含む」などの用語は、明細書上に記載した様々な構成要素を必ずしも全て含むと解釈してはならず、そのうち一部の構成要素は、含まれなくてもよく、又はさらなる構成要素をさらに含んでいてもよいと解釈すべきである。 As used herein, the singular term includes the plural term, unless the context clearly dictates otherwise. Terms such as "consisting of" or "including" in this application should not be construed as necessarily including all of the various components listed in the specification, and some of the components may not be included. It should be construed that the present invention may also include additional components.
本発明の一態様によるディスプレイ用接着シートは、アクリル系樹脂、ＵＶ開始剤、および後硬化（ｐｏｓｔ－ｃｕｒｅ）架橋剤を含む、接着組成物の硬化物である光学用透明接着（ＯＣＡ）フィルムを含むことを技術的特徴とする。 An adhesive sheet for display according to one embodiment of the present invention includes an optical clear adhesive (OCA) film that is a cured product of an adhesive composition containing an acrylic resin, a UV initiator, and a post-cure crosslinking agent. The technical feature is that it includes.
前記光学用透明接着（ＯＣＡ）フィルムは、Ｂ－ステージ（Ｂ－ｓｔａｇｅ）、つまり、半硬化状態であるのが好ましい。半硬化状態の光学用透明接着（ＯＣＡ）フィルムは、前記接着組成物に青色ＬＥＤランプを照射して、仮硬化（ｐｒｅ－ｈａｒｄｅｎｉｎｇ）させることで形成することができる。これらＢ－ステージの光学用透明接着（ＯＣＡ）フィルムは、硬化し切れた状態ではないため、ディスプレイに適用する際、ディスプレイ部材における屈曲した部分又は段差の存在する部分にも浮き上がることなく、適用できるという利点がある。 The optical clear adhesive (OCA) film is preferably in a B-stage, ie, semi-cured state. A semi-cured optical transparent adhesive (OCA) film can be formed by pre-hardening the adhesive composition by irradiating the adhesive composition with a blue LED lamp. These B-stage optical clear adhesive (OCA) films are not completely cured, so when applied to displays, they can be applied to curved parts or stepped parts of display members without lifting up. There is an advantage.
本発明の好ましい後硬化架橋剤は、ケイ皮酸ビニル（ｖｉｎｙｌ ｃｉｎｎａｍａｔｅ）を含むことができる。光学用透明接着（ＯＣＡ）フィルムが、Ｂ－ステージ状態であるときは、ケイ皮酸ビニルは、架橋反応が行われないまま、接着組成物に存在する。 Preferred post-cure crosslinkers of the present invention may include vinyl cinnamate. When the optical clear adhesive (OCA) film is in the B-stage state, the vinyl cinnamate is present in the adhesive composition without undergoing a crosslinking reaction.
ところが、前記Ｂ－ステージの光学用透明接着（ＯＣＡ）フィルムをディスプレイパネルに付着した後、紫外線（ＵＶ）を照射して硬化させると（後硬化に該当する）、ビニル基（ｖｉｎｙｌ ｇｒｏｕｐ）間の環化添加反応（Ｃｙｃｌｏ Ａｄｄｉｔｉｏｎ Ｒｅａｃｔｉｏｎ）により架橋化（ｃｒｏｓｓ－ｌｉｎｋｉｎｇ）が行われて、接着特性を発揮することができるようになる。 However, when the B-stage optical clear adhesive (OCA) film is attached to a display panel and then cured by irradiation with ultraviolet (UV) light (corresponding to post-curing), the bonding between the vinyl groups Cross-linking is performed by Cyclo Addition Reaction, and adhesive properties can be exhibited.
このように、本発明は、光学用透明接着（ＯＣＡ）フィルムを、仮硬化（一次硬化）された状態でディスプレイパネルに適用するため、ディスプレイ部材のうち、屈曲又は段差のある部分にも浮き上がり現象を最小化するか、除去した状態で密着して接着されてもよく、また、この後、紫外線（ＵＶ）硬化（２次硬化）を行うことによって、ディスプレイパネルの部材間の接着に優れるという利点がある。 As described above, in the present invention, since the optical transparent adhesive (OCA) film is applied to the display panel in a temporarily cured (primary cured) state, the lifting phenomenon may occur even in bent or stepped portions of the display member. The adhesive may be adhered to the display panel by minimizing or removing it, and by subsequently performing ultraviolet (UV) curing (secondary curing), it has the advantage of providing excellent adhesion between display panel members. There is.
前記光学用透明接着（ＯＣＡ）フィルムは、紫外線（ＵＶ）硬化前の６０℃及び１Ｈｚでのモデュラス（ｍｏｄｕｌｕｓ）が１０４Ｐａ～１０５Ｐａであってもよく、より好ましくは、１０４Ｐａ～０．９５×１０５Ｐａであってもよい。紫外線（ＵＶ）硬化前のモデュラスが１０４Ｐａ未満である場合、フィルム打ち抜き時、形状維持が不可能であるか、ムラが発生し得る。 The optical clear adhesive (OCA) film may have a modulus of 10 4 Pa to 10 5 Pa, more preferably 10 4 Pa to 10 5 Pa, at 60° C. and 1 Hz before ultraviolet (UV) curing. It may be 0.95×10 5 Pa. If the modulus before ultraviolet (UV) curing is less than 10 4 Pa, it may be impossible to maintain the shape or unevenness may occur during film punching.
また、前記光学用透明接着（ＯＣＡ）フィルムは、紫外線（ＵＶ）硬化後の６０℃及び１Ｈｚでのモデュラスが１０５Ｐａ～１０６Ｐａであってもよく、より好ましくは、１．５×１０５Ｐａ～１０６Ｐａであってもよい。紫外線（ＵＶ）硬化後のモデュラスが１０６Ｐａを超える場合、フィルム硬度（ｈａｒｄｎｅｓｓ）が増加しすぎて、合着時に浮き上がりが発生して、段差を克服し難しいことがある。 Further, the optical transparent adhesive (OCA) film may have a modulus of 10 5 Pa to 10 6 Pa at 60° C. and 1 Hz after ultraviolet (UV) curing, more preferably 1.5×10 It may be 5 Pa to 10 6 Pa. If the modulus after ultraviolet (UV) curing exceeds 10 6 Pa, the hardness of the film increases too much, causing lifting during bonding and making it difficult to overcome the difference in level.
以下では、本発明の光学用透明接着（ＯＣＡ）フィルムを形成するための接着組成物の成分について説明する。 Below, the components of the adhesive composition for forming the optical clear adhesive (OCA) film of the present invention will be explained.
＜アクリル系樹脂＞
本発明の接着組成物のアクリル系樹脂は、光学用透明接着（ＯＣＡ）フィルムを形成し、紫外線（ＵＶ）硬化用樹脂として通常使用され得るものであれば、制限なく使用することができる。
<Acrylic resin>
The acrylic resin of the adhesive composition of the present invention can be used without any limitation as long as it forms an optically transparent adhesive (OCA) film and can be normally used as an ultraviolet (UV) curing resin.
本発明の接着組成物のアクリル系樹脂は、好ましくは、アクリル単量体の共重合体であってもよい。 The acrylic resin of the adhesive composition of the present invention may preferably be a copolymer of acrylic monomers.
前記アクリル単量体は、２－エチルヘキシルアクリレート（２－ＥＨＡ）、イソボルニルアクリレート（ＩＢＯＡ）、ラウリル（メタ）アクリレートなどのアルキル（メタ）アクリレート、２－ヒドロキシエチルアクリレートなどのヒドロキシル基含有アルキル（メタ）アクリレート、アクリルアマイド（ＡＡＭ）、グリシジル（メタ）アクリレート、アクリロイルモルフォリン（ＡＣＭＯ）、ビニルアクリル酸（ＡＡ）、および（メタ）アクリル酸から構成された群より選ばれる１種以上であってもよい。 The acrylic monomer includes alkyl (meth)acrylates such as 2-ethylhexyl acrylate (2-EHA), isobornyl acrylate (IBOA), and lauryl (meth)acrylate, and hydroxyl group-containing alkyl (such as 2-hydroxyethyl acrylate) One or more types selected from the group consisting of meth)acrylate, acrylamide (AAM), glycidyl (meth)acrylate, acryloylmorpholine (ACMO), vinyl acrylic acid (AA), and (meth)acrylic acid, Good too.
本発明のアクリル系樹脂は、好ましくは、イソボルニルアクリレート（ＩＢＯＡ）、２－エチルヘキシルアクリレート（２－ＥＨＡ）、２－ヒドロキシエチルアクリレート、アクリロイルモルフォリン（ＡＣＭＯ）、ラウリルアクリレート（ＬＡ）の共重合体であってもよい。 The acrylic resin of the present invention is preferably a copolymer of isobornyl acrylate (IBOA), 2-ethylhexyl acrylate (2-EHA), 2-hydroxyethyl acrylate, acryloylmorpholine (ACMO), and lauryl acrylate (LA). It may be a combination.
＜ＵＶ開始剤＞
本発明のＵＶ開始剤は、アクリル系樹脂に添加される添加剤成分であって、紫外線（ＵＶ）が照射されると、重合（ｐｏｌｙｍｅｒｉｚａｔｉｏｎ）反応を開始させる物質である。ＵＶ開始剤は、通常のＵＶ開始剤として使用されるものであれば、制限なく含んでいてもよく、１種以上のＵＶ開始剤を混合して使用することもできる。
<UV initiator>
The UV initiator of the present invention is an additive component added to an acrylic resin, and is a substance that initiates a polymerization reaction when irradiated with ultraviolet (UV) light. The UV initiator may be included without any limitation as long as it is used as a normal UV initiator, and one or more types of UV initiators may be used in combination.
前記ＵＶ開始剤は、１－ヒドロキシ－シクロヘキシル－フェニル－ケトン（Ｉｒｇａｃｕｒｅ ９０７）、２－メチル１［４－（メチルチオ）フェニル］－２－モルホリノプロパン－１－オン（Ｉｒｇａｃｕｒｅ １８４Ｃ）、２－ヒドロキシ－２－メチル－１－フェニル－１－プロパノン（Ｄａｒｏｃｕｒ １１７３）、イルガキュア１８４Ｃとベンゾフェノン（ｂｅｎｚｏｐｈｅｎｏｎｅ）との混合開始剤（Ｉｒｇａｃｕｒｅ ５００）、イルガキュア１８４Ｃとイルガキュア１１７３との混合開始剤（Ｉｒｇａｃｕｒｅ １０００）、２－ヒドロキシ－１－［４－（２－ヒドロキシエトキシ）フェニル］－２－メチル－１－プロパノン（Ｉｒｇａｃｕｒｅ ２９５９）、ベンゾイルぎ酸メチル（Ｄａｒｏｃｕｒ ＭＢＦ）、α，α－ジメトキシ－アルファ－フェニルアセトフェノン（Ｉｒｇａｃｕｒｅ ６５１）、２－ベンジル－２－（ジメチルアミノ）－１－［４－（４－モルフォリノ）フェニル］－１－ブタノン（Ｉｒｇａｃｕｒｅ ３６９）、イルガキュア３６９とイルガキュア６５１との混合開始剤（Ｉｒｇａｃｕｒｅ １３００）、ジフェニル（２，４，６－トリメチルベンゾイン）－ホスフィンオキシド（Ｄａｒｏｃｕｒ ＴＰＯ）、ダロキュアＴＰＯとダロキュア１１７３との混合開始剤（Ｄａｒｏｃｕｒ ４２６５）、ホスフィンオキシド（ｐｈｏｓｐｈｉｎｅ ｏｘｉｄｅ）フェニルビス（２，４，６，－トリメチルベンゾイル）（Ｉｒｇａｃｕｒｅ ８１９）、イルガキュア８１９とダロキュア１１７３との混合開始剤（Ｉｒｇａｃｕｒｅ ２００５）、イルガキュア８１９とダロキュア１１７３との混合開始剤（Ｉｒｇａｃｕｒｅ ２０１０）、イルガキュア８１９とダロキュア１１７３との混合開始剤（Ｉｒｇａｃｕｒｅ ２０２０）、ビス（エタ５－２，４，－シクロペンタジエン－１－イル）ビス［２，６－ジフルオロ－３－（１Ｈ－ピロール－１－イル）フェニル］チタニウム（Ｉｒｇａｃｕｒｅ ７８４）、およびベンゾフェノンが含有された混合開始剤（ＨＳＰ１８８）から選ばれた１種以上を含むことができる。 The UV initiators include 1-hydroxy-cyclohexyl-phenyl-ketone (Irgacure 907), 2-methyl 1[4-(methylthio)phenyl]-2-morpholinopropan-1-one (Irgacure 184C), 2-hydroxy- 2-Methyl-1-phenyl-1-propanone (Darocur 1173), mixed initiator of Irgacure 184C and benzophenone (Irgacure 500), mixed initiator of Irgacure 184C and Irgacure 1173 (Irgacure 1000), 2- Hydroxy-1-[4-(2-hydroxyethoxy)phenyl]-2-methyl-1-propanone (Irgacure 2959), Methyl benzoylformate (Darocur MBF), α,α-dimethoxy-alpha-phenylacetophenone (Irgacure 651) ), 2-benzyl-2-(dimethylamino)-1-[4-(4-morpholino)phenyl]-1-butanone (Irgacure 369), mixed initiator of Irgacure 369 and Irgacure 651 (Irgacure 1300), diphenyl (2,4,6-trimethylbenzoin)-phosphine oxide (Darocur TPO), mixed initiator of Darocur TPO and Darocur 1173 (Darocur 4265), phosphine oxide phenylbis(2,4,6,-trimethyl Benzoyl) (Irgacure 819), Mixed initiator of Irgacure 819 and Darocure 1173 (Irgacure 2005), Mixed initiator of Irgacure 819 and Darocure 1173 (Irgacure 2010), Mixed initiator of Irgacure 819 and Darocure 1173 (Irgacure re 2020 ), bis(etha-5-2,4,-cyclopentadien-1-yl)bis[2,6-difluoro-3-(1H-pyrrol-1-yl)phenyl]titanium (Irgacure 784), and benzophenone. The mixed initiator (HSP188) may contain one or more selected from the following.
本発明のＵＶ開始剤は、アクリル系樹脂１００重量部を基準に、０．１～５．０重量部で含むのが好ましく、０．１～２．０重量部で含むのがより好ましい。ＵＶ開始剤が０．１重量部未満である場合、アクリル系樹脂の硬化反応が十分行われず、５．０重量部を超える場合、接着フィルムの硬化密度が低下して、接着特性が十分発現しない問題が発生し得る。 The UV initiator of the present invention is preferably contained in an amount of 0.1 to 5.0 parts by weight, more preferably 0.1 to 2.0 parts by weight, based on 100 parts by weight of the acrylic resin. If the amount of the UV initiator is less than 0.1 part by weight, the curing reaction of the acrylic resin will not take place sufficiently, and if it exceeds 5.0 parts by weight, the cured density of the adhesive film will decrease and the adhesive properties will not be sufficiently expressed. Problems can occur.
本発明のＵＶ開始剤としては、長波長ＵＶ開始剤０．０１～０．２重量部と、短波長ＵＶ開始剤０．２～１．０重量部との混合物を使用するのがより好ましい。前記長波長ＵＶ開始剤としては、ダロキュアＴＰＯ（２，４，６－ｔｒｉｍｅｔｈｙｌｂｅｎｚｏｙｌ－ｄｉｐｈｅｎｙｌｐｈｏｓｐｈｉｎｅ ｏｘｉｄｅ）、ダロキュアＴＰＯ－Ｌ（２，４，６－ｔｒｉｍｅｔｈｙｌｂｅｎｚｏｙｌ－ｄｉｐｈｅｎｙｌ ｐｈｏｓｐｈｉｎａｔｅ）イルガキュア８１９（ｂｉｓ（２，４，６－ｔｒｉｍｅｔｈｙｌｂｅｎｚｏｙｌ）－ｐｈｅｎｙｌｐｈｏｓｐｈｉｎｅ ｏｘｉｄｅ）などを例に挙げられるし、短波長ＵＶ開始剤としては、イルガキュア１８４（１－ｈｙｄｒｏｘｙ－ｃｙｃｌｏｈｅｘｙｌ－ｐｈｅｎｙｌ－ｋｅｔｏｎｅ）、ダロキュア１１７３（２－ｈｙｄｒｏｘｙ－２－ｍｅｔｈｙｌ－１－ｐｈｅｎｙｌ－１－ｐｒｏｐａｎｏｎｅ）、イルガキュア１２７（２－ｈｙｄｒｏｘｙ－１－{４－［４－（２－ｈｙｄｒｏｘｙ－２－ｍｅｔｈｙｌ－ｐｒｏｐｉｏｎｙｌ）－ｂｅｎｚｙｌ］－ｐｈｅｎｙｌ}－２－ｍｅｔｈｙｌｐｒｏｐａｎ－１－ｏｎｅ）を例に挙げられるものの、これに限定されない。 As the UV initiator of the present invention, it is more preferable to use a mixture of 0.01 to 0.2 parts by weight of long wavelength UV initiators and 0.2 to 1.0 parts by weight of short wavelength UV initiators. Examples of the long wavelength UV initiator include Darocure TPO (2,4,6-trimethylbenzoyl-diphenylphosphine oxide) and Darocure TPO-L (2,4,6-trimethylbenzoyl-diphenyl phosphine oxide). te) Irgacure 819 (bis(2,4,6 Examples of short-wavelength UV initiators include Irgacure 184 (1-hydroxy-cyclohexyl-phenyl-ketone), Darocure 1173 (2-hydrox y-2-methyl-1- phenyl-1-propanone), Irgacure 127 (2-hydroxy-1-{4-[4-(2-hydroxy-2-methyl-propionyl)-benzyl]-phenyl}-2-methylpropan-1-one) as an example These include, but are not limited to.
長波長ＵＶ開始剤を０．０１重量部未満で使用する場合、未硬化の発生によるフィルムムラが発生し得、０．２重量部を超えて使用する場合、過硬化により、半硬化状態（Ｂ－Ｓｔａｇｅ）の光学用透明接着（ＯＣＡ）フィルムを製造しにくいこともある。一方、短波長ＵＶ開始剤を０．２重量部未満で使用する場合、後硬化時、未反応モノマーの完全硬化が不可能であり得、１．０重量部を超えて使用する場合、過硬化により、硬化後の収縮率が増加し得る。 If the long wavelength UV initiator is used in an amount less than 0.01 part by weight, film unevenness may occur due to uncured film. - Stage) optical clear adhesive (OCA) films can be difficult to manufacture. On the other hand, if the short wavelength UV initiator is used in an amount less than 0.2 parts by weight, it may be impossible to completely cure unreacted monomers during post-curing, and if it is used in an amount exceeding 1.0 parts by weight, overcuring may be impossible. This can increase the shrinkage rate after curing.
＜後硬化架橋剤＞
本発明の後硬化架橋剤は、ＬＥＤランプの照射による一次硬化（仮硬化）では、環化添加反応が行われず、紫外線（ＵＶ）照射による二次硬化（後硬化）により、環化添加反応が行われて、架橋化（ｃｒｏｓｓ－ｌｉｎｋｉｎｇ）が起こり得る特性を備えるのが好適である。
<Post-curing crosslinking agent>
In the post-curing crosslinking agent of the present invention, the cyclization addition reaction does not occur during primary curing (temporary curing) by irradiation with an LED lamp, and the cyclization addition reaction occurs through secondary curing (post-curing) by ultraviolet (UV) irradiation. It is preferable to have properties that allow cross-linking to occur.
上記特性を有する後硬化架橋剤は、ケイ皮酸ビニル（ｖｉｎｙｌ ｃｉｎｎａｍａｔｅ）であるのが好ましい。ケイ皮酸ビニル（ｖｉｎｙｌ ｃｉｎｎａｍａｔｅ）は、紫外線（ＵＶ）照射によって、ビニル基（ｖｉｎｙｌ ｇｒｏｕｐ）間の環化添加反応が行われ得るため、後硬化架橋剤として好適である。 Preferably, the post-cure crosslinking agent having the above properties is vinyl cinnamate. Vinyl cinnamate is suitable as a post-curing crosslinking agent because a cyclization addition reaction between vinyl groups can be performed by ultraviolet (UV) irradiation.
本発明の後硬化架橋剤は、アクリル系樹脂１００重量部を基準に、１．０～５．０重量部で含むのが好ましく、２．０～５．０重量部で含むのがより好ましい。 The post-curing crosslinking agent of the present invention is preferably contained in an amount of 1.0 to 5.0 parts by weight, more preferably 2.0 to 5.0 parts by weight, based on 100 parts by weight of the acrylic resin.
後硬化架橋剤が１．０重量部未満である場合、環化添加反応が十分行われないし、５．０重量部を超える場合、架橋反応が発生しすぎて、硬化後の収縮率が大きくなり、収縮によるパネルが反る現象が発生し得る。 If the amount of the post-curing crosslinking agent is less than 1.0 parts by weight, the cyclization addition reaction will not be carried out sufficiently, and if it exceeds 5.0 parts by weight, the crosslinking reaction will occur too much and the shrinkage rate after curing will increase. , the panel may warp due to shrinkage.
本発明の光学用透明接着（ＯＣＡ）フィルムを形成するための接着組成物は、アクリル系樹脂、ＵＶ開始剤、および後硬化架橋剤のほか、必要に応じて、本発明の効果を発現し得る範囲内における他の添加剤を少量さらに含むことができる。前記添加剤は、例えば、接着促進剤、粘着付与剤、可塑剤、流動補助剤、湿潤補助剤、レオロジー改質剤、および酸化防止剤などから選ぶことができる。 The adhesive composition for forming the optical transparent adhesive (OCA) film of the present invention may exhibit the effects of the present invention in addition to an acrylic resin, a UV initiator, and a post-curing crosslinking agent, if necessary. Minor amounts of other additives within range may also be included. Said additives can be chosen, for example, from adhesion promoters, tackifiers, plasticizers, flow aids, wetting aids, rheology modifiers, antioxidants, and the like.
本発明の一態様によれば、図１に示されたように、本発明の一態様によるディスプレイ用接着シート１００は、光学用透明接着（ＯＣＡ）フィルム１０と、この両面に配置される第１離型フィルム２１と、第２離型フィルム２２と、を含むことができる。前記離型フィルムは、基材の一面が離型処理されたものであってもよい。
According to one aspect of the present invention, as shown in FIG. 1, a display
前記基材は、ポリエチレンテレフタラート（ｐｏｌｙｅｔｈｙｌｅｎｅ ｔｅｒｅｐｈｔｈａｌａｔｅ；ＰＥＴ）基材を含んでいてもよいが、これに限定されるものではない。前記離型処理は、当業界における通常に離型処理に使用できる物質であれば、制限なく使用することができ、例えば、シリコンで離型処理することが好ましい。 The base material may include, but is not limited to, a polyethylene terephthalate (PET) base material. For the mold release treatment, any material that can be used for mold release treatment in the art can be used without any restriction. For example, silicon is preferably used for the mold release treatment.
本発明の他の一態様によれば、上述した本発明のディスプレイ用接着シートの製造方法を提供する。前記ディスプレイ用接着シートの製造方法は、アクリル系樹脂、ＵＶ開始剤、および後硬化架橋剤を混合して、接着組成物を得るステップと、第１離型フィルム上に、前記接着組成物を塗布した後、その上に第２離型フィルムを配置して、接着シート構造体を形成するステップと、前記形成された接着シート構造体に青色ＬＥＤランプを照射して、仮硬化（ｐｒｅ－ｈａｒｄｅｎｉｎｇ）し、前記塗布された接着組成物をＢ－ステージ（Ｂ－ｓｔａｇｅ）状態の光学用透明接着（ＯＣＡ）フィルムで形成するステップと、を含み、前記後硬化架橋剤は、ケイ皮酸ビニルを含む。 According to another aspect of the present invention, there is provided a method for manufacturing the above-described adhesive sheet for display of the present invention. The method for producing an adhesive sheet for displays includes the steps of: mixing an acrylic resin, a UV initiator, and a post-curing crosslinking agent to obtain an adhesive composition; and applying the adhesive composition on a first release film. After that, a second release film is placed thereon to form an adhesive sheet structure, and the formed adhesive sheet structure is irradiated with a blue LED lamp for pre-hardening. and forming the applied adhesive composition into a B-stage optical clear adhesive (OCA) film, wherein the post-cure crosslinker comprises vinyl cinnamate. .
本発明のさらに他の一態様によれば、上述した本発明のディスプレイ用接着シートを使用して、ディスプレイパネル（ｐａｎｅｌ）を製造する方法を提供する。前記ディスプレイパネル（ｐａｎｅｌ）の製造方法は、上述した本発明のディスプレイ用接着シートから、前記光学用透明接着（ＯＣＡ）フィルムを抽出するステップと、一以上のディスプレイ部材上に、前記光学用透明接着（ＯＣＡ）フィルムを配置するステップと、前記光学用透明接着（ＯＣＡ）フィルムに紫外線（ＵＶ）を照射して、後硬化するステップと、を含むことができる。前記一以上のディスプレイ部材は、段差（ｓｔｅｐ）又は屈曲を有し得、前記後硬化するステップによって、前記光学用接着フィルムが、前記段差又は屈曲に一致して接着されてもよい。 According to yet another aspect of the present invention, there is provided a method of manufacturing a display panel using the display adhesive sheet of the present invention described above. The method for manufacturing the display panel includes the steps of extracting the optical transparent adhesive (OCA) film from the display adhesive sheet of the present invention, and applying the optical transparent adhesive (OCA) film on one or more display members. The method may include the steps of: disposing a (OCA) film; and irradiating the optical clear adhesive (OCA) film with ultraviolet (UV) light to post-cure it. The one or more display members may have a step or a bend, and the optical adhesive film may be adhered in accordance with the step or bend by the post-curing step.
本発明のさらに他の一態様によれば、上述した本発明のディスプレイ用接着シートを含むディスプレイを提供することができる。本発明のディスプレイは、ディスプレイの部材に存在する段差又は屈曲にも一致して接着され得る、本発明の光学用透明接着（ＯＣＡ）フィルムによって接着されたため、接着信頼性に優れる。 According to yet another aspect of the present invention, a display including the display adhesive sheet of the present invention described above can be provided. The display of the present invention has excellent adhesion reliability because it is adhered by the optical transparent adhesive (OCA) film of the present invention, which can be adhered to conform to the steps or bends present in the display member.
以下では、本発明の好ましい実施例によって、本発明の構成及び作用をさらに詳説することとする。ただ、これは、本発明の好ましい例示として提示されたものであり、如何なる意味でも、これによって本発明が制限されると解釈されてはならない。 In the following, the structure and operation of the present invention will be explained in further detail by means of preferred embodiments of the present invention. However, this is presented as a preferred example of the present invention, and should not be interpreted as limiting the present invention in any way.
ここに記載されていない内容は、この技術分野における通常の当業者であれば、技術的に十分類推することができるため、その説明を省略することとする。 Contents not described here can be sufficiently inferred technically by those with ordinary skill in this technical field, and therefore their explanation will be omitted.
＜実施例１＞
（１）アクリル系主剤樹脂の製造
イソボルニルアクリレート（ＩＢＯＡ）３５重量部、 ２－エチルヘキシルアクリレート（２－ＥＨＡ）４５重量部、２－ヒドロキシエチルアクリレート２０重量部、アクリロイルモルフォリン（ＡＣＭＯ）５重量部、およびラウリルアクリレート（ＬＡ）５重量部を混合した後、共重合して、アクリル系樹脂を得た。
<Example 1>
(1) Production of acrylic base resin 35 parts by weight of isobornyl acrylate (IBOA), 45 parts by weight of 2-ethylhexyl acrylate (2-EHA), 20 parts by weight of 2-hydroxyethyl acrylate, 5 parts by weight of acryloylmorpholine (ACMO) and 5 parts by weight of lauryl acrylate (LA), and then copolymerized to obtain an acrylic resin.
（２）接着組成物の製造
前記アクリル系樹脂１００重量部に対して、ＵＶ開始剤であるダロキュアＴＰＯ０．０９重量部とダロキュア１１７３０．６重量部との混合ＵＶ開始剤０．６９重量部、後硬化架橋剤であるケイ皮酸ビニル５重量部の材料を混合して、接着組成物を製造した。
(2) Production of adhesive composition 0.69 parts by weight of a UV initiator consisting of 0.09 parts by weight of Darocure TPO and 0.6 parts by weight of Darocur 11730, which are UV initiators, per 100 parts by weight of the acrylic resin. An adhesive composition was prepared by mixing the materials with 5 parts by weight of vinyl cinnamate, a cured crosslinking agent.
（３）第１離型フィルム及び第２離型フィルムの製造
２つのＰＥＴ基材を準備して、各ＰＥＴ基材の下部面にシリコン離型剤を薄膜塗布し、シリコン離型処理された第１離型フィルム（重剥離（ｈｅａｖｙ－ｒｅｌｅａｓｅ）離型フィルム）及び第２離型フィルム（軽剥離（ｌｉｇｈｔ－ｒｅｌｅａｓｅ）離型フィルム）を準備した。
(3) Production of the first release film and the second release film Two PET base materials are prepared, a thin film of silicone mold release agent is applied to the lower surface of each PET base material, and a second release film treated with silicone is coated with a thin film of silicone mold release agent. A first release film (heavy-release release film) and a second release film (light-release release film) were prepared.
（４）接着シートの製造
前記第１離型フィルム上に、前記（２）で製造した接着組成物を塗布して、厚さ２００μｍの光学用透明接着（ＯＣＡ）フィルムを形成した。その後、前記光学用透明接着（ＯＣＡ）フィルム上に、前記第２離型フィルムが相接するように配置して、接着シート構造体を形成した。前記接着シート構造体上に青色ＬＥＤランプ（波長：３６５ｎｍ）を照射して、仮硬化（一次硬化）を行った。
(4) Production of adhesive sheet The adhesive composition prepared in (2) above was applied onto the first release film to form an optical transparent adhesive (OCA) film with a thickness of 200 μm. Thereafter, the second release film was placed on the optical transparent adhesive (OCA) film so as to be in contact with the optical transparent adhesive (OCA) film to form an adhesive sheet structure. Temporary curing (primary curing) was performed by irradiating the adhesive sheet structure with a blue LED lamp (wavelength: 365 nm).
＜比較例１＞
上記実施例１と同様の方法により接着シートを製造するものの、ステップ（２）における後硬化架橋剤を添加していない接着組成物を使用した点でのみ相違する。
<Comparative example 1>
Although an adhesive sheet was produced in the same manner as in Example 1, the only difference was that in step (2) an adhesive composition to which no post-curing crosslinking agent was added was used.
＜実験例：モデュラス（ｍｏｄｕｌｕｓ）の測定＞
上記実施例１及び比較例１の接着シートに対して、モデュラスを測定するために、光学用透明接着（ＯＣＡ）フィルムのみを抽出して、サンプル化しており、その方法は、次のとおりである。
<Experiment example: Measurement of modulus>
In order to measure the modulus of the adhesive sheets of Example 1 and Comparative Example 1, only the optical transparent adhesive (OCA) film was extracted and sampled, and the method was as follows. .
サンプル化方法
上記実施例１及び比較例１それぞれから両面の離型フィルムを除去し、接着層を抽出して、２００μｍの光学用透明接着（ＯＣＡ）フィルムをサンプル化し、この過程を３回繰り返して、２００μｍの光学用透明接着（ＯＣＡ）フィルムを３つ積層し、総厚さ６００μｍの光学用透明接着（ＯＣＡ）フィルムサンプルを準備した。
Sampling method: Remove the release films on both sides from each of the above Example 1 and Comparative Example 1, extract the adhesive layer, sample a 200 μm optical clear adhesive (OCA) film, and repeat this process three times. , three 200 μm optical clear adhesive (OCA) films were laminated to prepare an optical clear adhesive (OCA) film sample with a total thickness of 600 μm.
モデュラスの測定方法
上記実施例１及び比較例１それぞれの光学用透明接着（ＯＣＡ）フィルムのサンプルに対して、測定装備であるレオメーター（Ｒｈｅｏｍｅｔｅｒ，ＴＡ ｉｎｓｔｒｕｍｅｎｔ，ＡＲＥＳ Ｇ２）を用いて、軸方向力（Ａｘｉａｌ ｆｏｒｃｅ）２Ｎ、開始温度（Ｓｔａｒｔ Ｔｅｍｐ．）－５５℃、終決温度（Ｅｎｄ Ｔｅｍｐ．）２５０℃、昇温速度１０℃／ｍｉｎ、ストレイン（ｓｔｒａｉｎ）１％、および頻度（Ｆｒｅｑｕｅｎｃｙ）１Ｈｚの条件で、温度によるモデュラス（ｓｔｏｒａｇｅ ｍｏｄｕｌｕｓ）を測定しており、これを紫外線（ＵＶ）照射の前後それぞれに対して測定した。
Method for Measuring Modulus Axial force was measured using a rheometer (Rheometer, TA instrument, ARES G2), which is a measurement equipment, for each sample of the optical transparent adhesive (OCA) film of Example 1 and Comparative Example 1. (Axial force) 2N, Start Temp. -55°C, End Temp. 250°C,
前記測定によって、フローティングされる資料（図３）から測定された６０℃でのモデュラス値を下記の表１に示した。 The modulus values at 60° C. measured from the floating material (FIG. 3) are shown in Table 1 below.
上記表１から分かるように、後硬化架橋剤であるケイ皮酸ビニルを含む、接着組成物で製造した光学用透明接着（ＯＣＡ）フィルムである実施例１は、そうでない比較例１に比べて、ＵＶ照射後、モデュラスの増加幅が上昇し、屈曲又は段差のあるディスプレイ部材に浮き上がることなく、密着して接着力を発現できる特性を有することが分かる。 As can be seen from Table 1 above, Example 1, which is an optical clear adhesive (OCA) film made with an adhesive composition containing vinyl cinnamate as a post-curing crosslinking agent, has a higher performance than Comparative Example 1, which does not. It can be seen that after UV irradiation, the increase in modulus increases, and it has the property of being able to closely adhere to display members with bends or steps without lifting and exhibit adhesive strength.
以上のように、本発明について例示の図面を参照して説明したが、本発明は、本明細書に開示の実施例と図面によって限定されるものではなく、本発明の技術思想の範囲内における通常の技術者によって様々な変形が行われることは自明である。さらに、本発明の実施例を前述しつつ、本発明の構成による作用効果を明示的に記載して説明しなかったとしても、該構成によって予測可能な効果も認めるべきであることは当然である。 As described above, the present invention has been described with reference to the illustrative drawings, but the present invention is not limited to the embodiments and drawings disclosed in this specification, and is intended to be within the scope of the technical idea of the present invention. Obviously, various modifications will occur to those of ordinary skill in the art. Further, while the embodiments of the present invention have been described above, even if the effects of the configuration of the present invention are not explicitly described and explained, it is natural that effects that can be predicted by the configuration should also be recognized. .
１０ 接着シート
２１ 第１離型フィルム
２２ 第２離型フィルム
10
Claims (14)
前記後硬化架橋剤は、ケイ皮酸ビニル（ｖｉｎｙｌ ｃｉｎｎａｍａｔｅ）を含むことを特徴とする、
ディスプレイ用接着シート。 an optical clear adhesive (OCA) film that is a cured product of an adhesive composition that includes an acrylic resin, a UV initiator, and a post-cure crosslinker;
The post-curing crosslinking agent includes vinyl cinnamate.
Adhesive sheet for display.
請求項１記載のディスプレイ用接着シート。 The optical transparent adhesive (OCA) film is in a B-stage state.
The adhesive sheet for display according to claim 1.
紫外線（ＵＶ）硬化前の６０℃及び１Ｈｚでのモデュラス（ｍｏｄｕｌｕｓ）が１０４Ｐａ～１０５Ｐａであり、
紫外線（ＵＶ）硬化後の６０℃及び１Ｈｚでのモデュラス（ｍｏｄｕｌｕｓ）が１０５Ｐａ～１０６Ｐａであることを特徴とする，
請求項１記載のディスプレイ用接着シート。 The optical transparent adhesive (OCA) film is
The modulus at 60° C. and 1 Hz before ultraviolet (UV) curing is 10 4 Pa to 10 5 Pa,
Characterized by a modulus of 10 5 Pa to 10 6 Pa at 60° C. and 1 Hz after ultraviolet (UV) curing.
The adhesive sheet for display according to claim 1.
請求項１記載のディスプレイ用接着シート。 The adhesive composition contains 0.1 to 5.0 parts by weight of the UV initiator and 1.0 to 5.0 parts by weight of the post-curing crosslinking agent based on 100 parts by weight of the acrylic resin. characterized by
The adhesive sheet for display according to claim 1.
請求項１記載のディスプレイ用接着シート。 The UV initiator is a mixture of 0.01 to 0.2 parts by weight of a long wavelength UV initiator and 0.2 to 1.0 parts by weight of a short wavelength UV initiator,
The adhesive sheet for display according to claim 1.
請求項１記載のディスプレイ用接着シート。 The method further includes a first release film and a second release film disposed on both sides of the optical transparent adhesive (OCA) film.
The adhesive sheet for display according to claim 1.
第１離型フィルム上に、前記接着組成物を塗布した後、その上に第２離型フィルムを配置して、接着シート構造体を形成するステップと、
前記形成された接着シート構造体に青色ＬＥＤランプを照射して、仮硬化（ｐｒｅ－ｈａｒｄｅｎｉｎｇ）し、前記塗布された接着組成物をＢ－ステージ（Ｂ－ｓｔａｇｅ）状態の光学用透明接着（ＯＣＡ）フィルムで形成するステップと、を含み、
前記後硬化架橋剤は、ケイ皮酸ビニルを含むことを特徴とする、
ディスプレイ用接着シートの製造方法。 mixing an acrylic resin, a UV initiator, and a post-cure crosslinker to obtain an adhesive composition;
After applying the adhesive composition on the first release film, disposing a second release film thereon to form an adhesive sheet structure;
The formed adhesive sheet structure is pre-hardened by irradiating the formed adhesive sheet structure with a blue LED lamp, and the applied adhesive composition is applied to an optical transparent adhesive (OCA) in a B-stage state. ) forming a film;
The post-curing crosslinking agent includes vinyl cinnamate.
A method for producing adhesive sheets for displays.
紫外線（ＵＶ）硬化前の６０℃及び１Ｈｚでのモデュラス（ｍｏｄｕｌｕｓ）が１０４Ｐａ～１０５Ｐａであり、
紫外線（ＵＶ）硬化後の６０℃及び１Ｈｚでのモデュラス（ｍｏｄｕｌｕｓ）が１０５Ｐａ～１０６Ｐａであることを特徴とする、
請求項７記載のディスプレイ用接着シートの製造方法。 The optical transparent adhesive (OCA) film is
The modulus at 60° C. and 1 Hz before ultraviolet (UV) curing is 10 4 Pa to 10 5 Pa,
characterized by a modulus of 10 5 Pa to 10 6 Pa at 60° C. and 1 Hz after ultraviolet (UV) curing;
The method for producing an adhesive sheet for display according to claim 7.
請求項７記載のディスプレイ用接着シートの製造方法。 The adhesive composition contains 0.1 to 5.0 parts by weight of the UV initiator and 1.0 to 5.0 parts by weight of the post-curing crosslinking agent based on 100 parts by weight of the acrylic resin. characterized by
The method for producing an adhesive sheet for display according to claim 7.
一以上のディスプレイ部材上に、前記光学用透明接着（ＯＣＡ）フィルムを配置するステップと、
前記光学用透明接着（ＯＣＡ）フィルムに紫外線（ＵＶ）を照射して、後硬化するステップと、を含む、
ディスプレイパネル（ｐａｎｅｌ）の製造方法。 Extracting the optical clear adhesive (OCA) film from the display adhesive sheet according to any one of claims 1 to 7;
disposing the optical clear adhesive (OCA) film on one or more display members;
irradiating the optical clear adhesive (OCA) film with ultraviolet (UV) light to post-cure it;
A method for manufacturing a display panel.
請求項１０記載のディスプレイパネルの製造方法。 The at least one display member may have a step or a bend.
The method for manufacturing a display panel according to claim 10.
請求項１１記載のディスプレイパネルの製造方法。 The optical adhesive film is bonded in accordance with the step or bend by the post-curing step.
The method for manufacturing a display panel according to claim 11.
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