WO2022230890A1 - 積層光学フィルム - Google Patents
積層光学フィルム Download PDFInfo
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- WO2022230890A1 WO2022230890A1 PCT/JP2022/018917 JP2022018917W WO2022230890A1 WO 2022230890 A1 WO2022230890 A1 WO 2022230890A1 JP 2022018917 W JP2022018917 W JP 2022018917W WO 2022230890 A1 WO2022230890 A1 WO 2022230890A1
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- WO
- WIPO (PCT)
- Prior art keywords
- optical film
- meth
- acrylate
- adhesive layer
- film
- Prior art date
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- 239000012788 optical film Substances 0.000 title claims abstract description 198
- 239000012790 adhesive layer Substances 0.000 claims abstract description 79
- 239000010408 film Substances 0.000 claims description 91
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 79
- 239000000203 mixture Substances 0.000 description 60
- 150000001875 compounds Chemical class 0.000 description 54
- -1 polyethylene terephthalate Polymers 0.000 description 35
- 238000005259 measurement Methods 0.000 description 28
- 238000007373 indentation Methods 0.000 description 21
- 238000000034 method Methods 0.000 description 21
- 239000000853 adhesive Substances 0.000 description 20
- 230000001070 adhesive effect Effects 0.000 description 20
- 230000001681 protective effect Effects 0.000 description 20
- 239000000178 monomer Substances 0.000 description 18
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical class CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 16
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 15
- 230000000903 blocking effect Effects 0.000 description 15
- 238000000576 coating method Methods 0.000 description 12
- 238000006073 displacement reaction Methods 0.000 description 12
- 150000003926 acrylamides Chemical class 0.000 description 11
- 239000011248 coating agent Substances 0.000 description 11
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical group NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 10
- 125000002091 cationic group Chemical group 0.000 description 10
- 125000000524 functional group Chemical group 0.000 description 10
- 230000001629 suppression Effects 0.000 description 9
- 239000004593 Epoxy Substances 0.000 description 8
- 150000001252 acrylic acid derivatives Chemical class 0.000 description 8
- 238000005520 cutting process Methods 0.000 description 8
- 239000003999 initiator Substances 0.000 description 8
- 238000011282 treatment Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- 238000012545 processing Methods 0.000 description 7
- 229920002678 cellulose Polymers 0.000 description 6
- 239000001913 cellulose Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 239000003505 polymerization initiator Substances 0.000 description 6
- 239000002994 raw material Substances 0.000 description 6
- 239000011342 resin composition Substances 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 239000004372 Polyvinyl alcohol Substances 0.000 description 5
- 125000003647 acryloyl group Chemical group O=C([*])C([H])=C([H])[H] 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- AHHWIHXENZJRFG-UHFFFAOYSA-N oxetane Chemical compound C1COC1 AHHWIHXENZJRFG-UHFFFAOYSA-N 0.000 description 5
- 229920002451 polyvinyl alcohol Polymers 0.000 description 5
- BTJPUDCSZVCXFQ-UHFFFAOYSA-N 2,4-diethylthioxanthen-9-one Chemical compound C1=CC=C2C(=O)C3=CC(CC)=CC(CC)=C3SC2=C1 BTJPUDCSZVCXFQ-UHFFFAOYSA-N 0.000 description 4
- 229920000089 Cyclic olefin copolymer Polymers 0.000 description 4
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 4
- QYKIQEUNHZKYBP-UHFFFAOYSA-N Vinyl ether Chemical group C=COC=C QYKIQEUNHZKYBP-UHFFFAOYSA-N 0.000 description 4
- 125000002723 alicyclic group Chemical group 0.000 description 4
- 238000010894 electron beam technology Methods 0.000 description 4
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 4
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 4
- 229910052753 mercury Inorganic materials 0.000 description 4
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 125000003566 oxetanyl group Chemical group 0.000 description 4
- 239000003504 photosensitizing agent Substances 0.000 description 4
- 230000000704 physical effect Effects 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 4
- 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 3
- 125000001797 benzyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])* 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 125000003700 epoxy group Chemical group 0.000 description 3
- 229910052736 halogen Inorganic materials 0.000 description 3
- 150000002367 halogens Chemical class 0.000 description 3
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 3
- 229920000098 polyolefin Polymers 0.000 description 3
- YRHRIQCWCFGUEQ-UHFFFAOYSA-N thioxanthen-9-one Chemical class C1=CC=C2C(=O)C3=CC=CC=C3SC2=C1 YRHRIQCWCFGUEQ-UHFFFAOYSA-N 0.000 description 3
- 229920002554 vinyl polymer Polymers 0.000 description 3
- HHQAGBQXOWLTLL-UHFFFAOYSA-N (2-hydroxy-3-phenoxypropyl) prop-2-enoate Chemical compound C=CC(=O)OCC(O)COC1=CC=CC=C1 HHQAGBQXOWLTLL-UHFFFAOYSA-N 0.000 description 2
- UNMJLQGKEDTEKJ-UHFFFAOYSA-N (3-ethyloxetan-3-yl)methanol Chemical compound CCC1(CO)COC1 UNMJLQGKEDTEKJ-UHFFFAOYSA-N 0.000 description 2
- BXSPZNVFEYWSLZ-UHFFFAOYSA-N (3-phenoxyphenyl)methyl prop-2-enoate Chemical compound C=CC(=O)OCC1=CC=CC(OC=2C=CC=CC=2)=C1 BXSPZNVFEYWSLZ-UHFFFAOYSA-N 0.000 description 2
- ZDQNWDNMNKSMHI-UHFFFAOYSA-N 1-[2-(2-prop-2-enoyloxypropoxy)propoxy]propan-2-yl prop-2-enoate Chemical compound C=CC(=O)OC(C)COC(C)COCC(C)OC(=O)C=C ZDQNWDNMNKSMHI-UHFFFAOYSA-N 0.000 description 2
- WULAHPYSGCVQHM-UHFFFAOYSA-N 2-(2-ethenoxyethoxy)ethanol Chemical compound OCCOCCOC=C WULAHPYSGCVQHM-UHFFFAOYSA-N 0.000 description 2
- IAMASUILMZETHW-UHFFFAOYSA-N 2-(2-hydroxyethoxy)-1-phenoxyethanol;prop-2-enoic acid Chemical compound OC(=O)C=C.OCCOCC(O)OC1=CC=CC=C1 IAMASUILMZETHW-UHFFFAOYSA-N 0.000 description 2
- TXBCBTDQIULDIA-UHFFFAOYSA-N 2-[[3-hydroxy-2,2-bis(hydroxymethyl)propoxy]methyl]-2-(hydroxymethyl)propane-1,3-diol Chemical compound OCC(CO)(CO)COCC(CO)(CO)CO TXBCBTDQIULDIA-UHFFFAOYSA-N 0.000 description 2
- KANZWHBYRHQMKZ-UHFFFAOYSA-N 2-ethenylpyrazine Chemical compound C=CC1=CN=CC=N1 KANZWHBYRHQMKZ-UHFFFAOYSA-N 0.000 description 2
- NLGDWWCZQDIASO-UHFFFAOYSA-N 2-hydroxy-1-(7-oxabicyclo[4.1.0]hepta-1,3,5-trien-2-yl)-2-phenylethanone Chemical class OC(C(=O)c1cccc2Oc12)c1ccccc1 NLGDWWCZQDIASO-UHFFFAOYSA-N 0.000 description 2
- BIDWUUDRRVHZLQ-UHFFFAOYSA-N 3-ethyl-3-(2-ethylhexoxymethyl)oxetane Chemical compound CCCCC(CC)COCC1(CC)COC1 BIDWUUDRRVHZLQ-UHFFFAOYSA-N 0.000 description 2
- JUXZNIDKDPLYBY-UHFFFAOYSA-N 3-ethyl-3-(phenoxymethyl)oxetane Chemical compound C=1C=CC=CC=1OCC1(CC)COC1 JUXZNIDKDPLYBY-UHFFFAOYSA-N 0.000 description 2
- LMIOYAVXLAOXJI-UHFFFAOYSA-N 3-ethyl-3-[[4-[(3-ethyloxetan-3-yl)methoxymethyl]phenyl]methoxymethyl]oxetane Chemical compound C=1C=C(COCC2(CC)COC2)C=CC=1COCC1(CC)COC1 LMIOYAVXLAOXJI-UHFFFAOYSA-N 0.000 description 2
- NHJIDZUQMHKGRE-UHFFFAOYSA-N 7-oxabicyclo[4.1.0]heptan-4-yl 2-(7-oxabicyclo[4.1.0]heptan-4-yl)acetate Chemical compound C1CC2OC2CC1OC(=O)CC1CC2OC2CC1 NHJIDZUQMHKGRE-UHFFFAOYSA-N 0.000 description 2
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 2
- 229920002284 Cellulose triacetate Polymers 0.000 description 2
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 2
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 description 2
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 2
- 239000002841 Lewis acid Substances 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 2
- ZJCCRDAZUWHFQH-UHFFFAOYSA-N Trimethylolpropane Chemical compound CCC(CO)(CO)CO ZJCCRDAZUWHFQH-UHFFFAOYSA-N 0.000 description 2
- NNLVGZFZQQXQNW-ADJNRHBOSA-N [(2r,3r,4s,5r,6s)-4,5-diacetyloxy-3-[(2s,3r,4s,5r,6r)-3,4,5-triacetyloxy-6-(acetyloxymethyl)oxan-2-yl]oxy-6-[(2r,3r,4s,5r,6s)-4,5,6-triacetyloxy-2-(acetyloxymethyl)oxan-3-yl]oxyoxan-2-yl]methyl acetate Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](OC(C)=O)[C@H]1OC(C)=O)O[C@H]1[C@@H]([C@@H](OC(C)=O)[C@H](OC(C)=O)[C@@H](COC(C)=O)O1)OC(C)=O)COC(=O)C)[C@@H]1[C@@H](COC(C)=O)O[C@@H](OC(C)=O)[C@H](OC(C)=O)[C@H]1OC(C)=O NNLVGZFZQQXQNW-ADJNRHBOSA-N 0.000 description 2
- 125000003545 alkoxy group Chemical group 0.000 description 2
- 150000001454 anthracenes Chemical class 0.000 description 2
- 125000003710 aryl alkyl group Chemical group 0.000 description 2
- 150000008366 benzophenones Chemical class 0.000 description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 239000003431 cross linking reagent Substances 0.000 description 2
- 125000000753 cycloalkyl group Chemical group 0.000 description 2
- 125000000113 cyclohexyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C1([H])[H] 0.000 description 2
- 125000001511 cyclopentyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C1([H])[H] 0.000 description 2
- DIOQZVSQGTUSAI-UHFFFAOYSA-N decane Chemical compound CCCCCCCCCC DIOQZVSQGTUSAI-UHFFFAOYSA-N 0.000 description 2
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- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 2
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- 229920001477 hydrophilic polymer Polymers 0.000 description 2
- 229910052740 iodine Inorganic materials 0.000 description 2
- 239000011630 iodine Substances 0.000 description 2
- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 description 2
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- 229910001507 metal halide Inorganic materials 0.000 description 2
- 150000005309 metal halides Chemical class 0.000 description 2
- UUORTJUPDJJXST-UHFFFAOYSA-N n-(2-hydroxyethyl)prop-2-enamide Chemical group OCCNC(=O)C=C UUORTJUPDJJXST-UHFFFAOYSA-N 0.000 description 2
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- HIYIGPVBMDKPCR-UHFFFAOYSA-N 1,1-bis(ethenoxymethyl)cyclohexane Chemical compound C=COCC1(COC=C)CCCCC1 HIYIGPVBMDKPCR-UHFFFAOYSA-N 0.000 description 1
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- JWYVGKFDLWWQJX-UHFFFAOYSA-N 1-ethenylazepan-2-one Chemical compound C=CN1CCCCCC1=O JWYVGKFDLWWQJX-UHFFFAOYSA-N 0.000 description 1
- OSSNTDFYBPYIEC-UHFFFAOYSA-N 1-ethenylimidazole Chemical compound C=CN1C=CN=C1 OSSNTDFYBPYIEC-UHFFFAOYSA-N 0.000 description 1
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- BFYSJBXFEVRVII-UHFFFAOYSA-N 1-prop-1-enylpyrrolidin-2-one Chemical compound CC=CN1CCCC1=O BFYSJBXFEVRVII-UHFFFAOYSA-N 0.000 description 1
- YIKSHDNOAYSSPX-UHFFFAOYSA-N 1-propan-2-ylthioxanthen-9-one Chemical compound S1C2=CC=CC=C2C(=O)C2=C1C=CC=C2C(C)C YIKSHDNOAYSSPX-UHFFFAOYSA-N 0.000 description 1
- RHNJVKIVSXGYBD-UHFFFAOYSA-N 10-prop-2-enoyloxydecyl prop-2-enoate Chemical compound C=CC(=O)OCCCCCCCCCCOC(=O)C=C RHNJVKIVSXGYBD-UHFFFAOYSA-N 0.000 description 1
- 125000004206 2,2,2-trifluoroethyl group Chemical group [H]C([H])(*)C(F)(F)F 0.000 description 1
- BRKORVYTKKLNKX-UHFFFAOYSA-N 2,4-di(propan-2-yl)thioxanthen-9-one Chemical compound C1=CC=C2C(=O)C3=CC(C(C)C)=CC(C(C)C)=C3SC2=C1 BRKORVYTKKLNKX-UHFFFAOYSA-N 0.000 description 1
- UXCIJKOCUAQMKD-UHFFFAOYSA-N 2,4-dichlorothioxanthen-9-one Chemical compound C1=CC=C2C(=O)C3=CC(Cl)=CC(Cl)=C3SC2=C1 UXCIJKOCUAQMKD-UHFFFAOYSA-N 0.000 description 1
- LCHAFMWSFCONOO-UHFFFAOYSA-N 2,4-dimethylthioxanthen-9-one Chemical compound C1=CC=C2C(=O)C3=CC(C)=CC(C)=C3SC2=C1 LCHAFMWSFCONOO-UHFFFAOYSA-N 0.000 description 1
- HLIQLHSBZXDKLV-UHFFFAOYSA-N 2-(2-hydroxyethoxy)-1-phenoxyethanol Chemical compound OCCOCC(O)OC1=CC=CC=C1 HLIQLHSBZXDKLV-UHFFFAOYSA-N 0.000 description 1
- JAHNSTQSQJOJLO-UHFFFAOYSA-N 2-(3-fluorophenyl)-1h-imidazole Chemical compound FC1=CC=CC(C=2NC=CN=2)=C1 JAHNSTQSQJOJLO-UHFFFAOYSA-N 0.000 description 1
- LCZVSXRMYJUNFX-UHFFFAOYSA-N 2-[2-(2-hydroxypropoxy)propoxy]propan-1-ol Chemical compound CC(O)COC(C)COC(C)CO LCZVSXRMYJUNFX-UHFFFAOYSA-N 0.000 description 1
- FGTYTUFKXYPTML-UHFFFAOYSA-N 2-benzoylbenzoic acid Chemical compound OC(=O)C1=CC=CC=C1C(=O)C1=CC=CC=C1 FGTYTUFKXYPTML-UHFFFAOYSA-N 0.000 description 1
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- WVQHODUGKTXKQF-UHFFFAOYSA-N 2-ethyl-2-methylhexane-1,1-diol Chemical compound CCCCC(C)(CC)C(O)O WVQHODUGKTXKQF-UHFFFAOYSA-N 0.000 description 1
- 125000000954 2-hydroxyethyl group Chemical group [H]C([*])([H])C([H])([H])O[H] 0.000 description 1
- BQZJOQXSCSZQPS-UHFFFAOYSA-N 2-methoxy-1,2-diphenylethanone Chemical compound C=1C=CC=CC=1C(OC)C(=O)C1=CC=CC=C1 BQZJOQXSCSZQPS-UHFFFAOYSA-N 0.000 description 1
- 125000004200 2-methoxyethyl group Chemical group [H]C([H])([H])OC([H])([H])C([H])([H])* 0.000 description 1
- MYISVPVWAQRUTL-UHFFFAOYSA-N 2-methylthioxanthen-9-one Chemical compound C1=CC=C2C(=O)C3=CC(C)=CC=C3SC2=C1 MYISVPVWAQRUTL-UHFFFAOYSA-N 0.000 description 1
- 125000003903 2-propenyl group Chemical group [H]C([*])([H])C([H])=C([H])[H] 0.000 description 1
- KGIGUEBEKRSTEW-UHFFFAOYSA-N 2-vinylpyridine Chemical compound C=CC1=CC=CC=N1 KGIGUEBEKRSTEW-UHFFFAOYSA-N 0.000 description 1
- FNYWFRSQRHGKJT-UHFFFAOYSA-N 3-ethyl-3-[(3-ethyloxetan-3-yl)methoxymethyl]oxetane Chemical compound C1OCC1(CC)COCC1(CC)COC1 FNYWFRSQRHGKJT-UHFFFAOYSA-N 0.000 description 1
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- CYUZOYPRAQASLN-UHFFFAOYSA-N 3-prop-2-enoyloxypropanoic acid Chemical compound OC(=O)CCOC(=O)C=C CYUZOYPRAQASLN-UHFFFAOYSA-N 0.000 description 1
- HMBNQNDUEFFFNZ-UHFFFAOYSA-N 4-ethenoxybutan-1-ol Chemical compound OCCCCOC=C HMBNQNDUEFFFNZ-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/02—Physical, chemical or physicochemical properties
- B32B7/023—Optical properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J201/00—Adhesives based on unspecified macromolecular compounds
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
Definitions
- the present invention relates to a laminated optical film.
- a display panel has a laminated structure including, for example, a pixel panel, a touch panel, and a surface protective cover.
- Various functional optical films having predetermined optical functions are also included in the laminated structure of the display panel.
- Functional optical films include, for example, polarizer films and retardation films.
- the functional optical film is incorporated in a laminated structure in the form of a laminated optical film, for example, in a state where it is bonded to another optical film such as a protective film via an adhesive.
- a laminated optical film is described, for example, in Patent Document 1 below.
- a long laminated optical film is manufactured by the roll-to-roll method and handled in the form of a roll.
- thinning of optical films is progressing.
- a load is applied to the laminated optical film roll in the film thickness direction (roll radial direction).
- part of the adhesive layer protrudes from between the optical films at the end of the laminated optical film.
- this adhesive reaches the adjacent optical film beyond the optical film at the end of the roll, the adjacent optical films are adhered by the adhesive.
- the above-described edge blocking is particularly likely to occur because the optical film and the adhesive layer are soft.
- a laminated optical film for a foldable display panel since the adhesive layer between the optical films is soft, edge blocking is likely to occur even during contour processing of the laminated optical film.
- a laminated optical film that is prone to edge blocking is installed in a flexible device such as a smartphone, stress in the laminated optical film occurs in the shear direction of the adhesive interface when used for a long time in a high temperature environment. As a result, peeling is likely to occur at the adhesion interface.
- the present invention provides a laminated optical film that is suitable for suppressing edge blocking in a laminated optical film that includes an adhesive layer.
- the present invention [1] is a laminated optical film comprising a first optical film, an adhesive layer, and a second optical film in order in the thickness direction, wherein the adhesive layer is bonded to the first optical film, and a side surface that is bonded to the second optical film and the adhesive layer is recessed inwardly from the first edge of the first optical film and the second edge of the second optical film in the plane direction orthogonal to the thickness direction have
- the adhesive layer sandwiched between the first optical film and the second optical film extends from the first edge of the first optical film and the second edge of the second optical film. also has an inwardly recessed side surface. At the edges of the laminated optical film, where the adhesive layer has such a recessed side surface, even when a load is applied to the laminated optical film in the thickness direction, the optical The adhesive layer is suppressed from protruding from between the films. Therefore, this laminated optical film is suitable for suppressing edge blocking.
- the present invention [2] according to the above [1], wherein the recessed length of the side surface from the inner edge of the first edge and the second edge in the surface direction is 0.05 ⁇ m or more.
- Such a configuration is preferable for suppressing the protrusion of the adhesive layer from between the optical films, and therefore preferable for suppressing edge blocking. Suppression of edge blocking is useful for securing transportability and handleability during processing of the laminated optical film.
- the present invention [3] according to the above [1], wherein the recessed length of the side surface from the inner edge in the surface direction of the first edge and the second edge is 1.0 ⁇ m or less.
- the laminated optical film described in [2] is included.
- Such a configuration is preferable for suppressing peeling between the first and second optical films at the end of the laminated optical film.
- this configuration is preferable for ensuring the bondability of the adhesive layer between the optical films and suppressing peeling even in a high-temperature and high-humidity environment.
- the above configuration ensures the reinforcing function of the adhesive layer for both ends (first end and second end) of the first and second optical films, thereby ensuring impact resistance of both ends. is also preferred.
- FIG. 2 is an enlarged cross-sectional view of an end portion of the laminated optical film shown in FIG. 1;
- FIG. 2 is an enlarged cross-sectional view of an end portion of a modified example of the laminated optical film shown in FIG. 1.
- FIG. In this modification, the side surface of the adhesive layer has a curved concave shape.
- 2 is an enlarged cross-sectional view of an end portion of another modified example of the laminated optical film shown in FIG. 1.
- FIG. In this modification, the side surface of the adhesive layer has a partially recessed shape.
- a laminated optical film X as an embodiment of the laminated optical film of the present invention comprises an optical film 10 (first optical film), an optical film 20 (second optical film), and an adhesive layer, as shown in FIG. 30.
- the laminated optical film X has a sheet shape with a predetermined thickness and spreads in a direction orthogonal to the thickness direction H (plane direction).
- the laminated optical film X includes an optical film 10, an adhesive layer 30, and an optical film 20 in the thickness direction H in this order.
- the adhesive layer 30 bonds the optical films 10 and 20 together.
- a laminated optical film has a long shape that is long in one direction and is handled in the form of a roll.
- the laminated optical film X is a composite film incorporated into the laminated structure of the display panel.
- the optical film 10 is a functional optical film in this embodiment.
- Functional optical films include, for example, polarizer films and retardation films.
- a polarizer film includes, for example, a hydrophilic polymer film that has undergone a dyeing treatment with a dichroic substance and a subsequent stretching treatment.
- Dichroic substances include, for example, iodine and dichroic dyes.
- Hydrophilic polymer films include, for example, polyvinyl alcohol (PVA) films, partially formalized PVA films, and partially saponified ethylene-vinyl acetate copolymer films.
- Polarizer films also include oriented polyene films. Materials for the oriented polyene film include, for example, dehydrated PVA and dehydrochlorinated polyvinyl chloride.
- a PVA film that has undergone a dyeing treatment with iodine and a subsequent uniaxial stretching treatment is preferable because it has excellent optical properties such as polarizing properties.
- the thickness of the optical film 10 as a polarizer film is preferably 15 ⁇ m or less, more preferably 12 ⁇ m or less, even more preferably 10 ⁇ m or less, and particularly preferably 8 ⁇ m or less, from the viewpoint of thinning.
- a thin polarizer film has excellent visibility due to its small thickness unevenness, and is excellent in durability against thermal shock due to its small dimensional change due to temperature change.
- the thickness of the optical film 10 as a polarizer film is preferably 3 ⁇ m or more, more preferably 5 ⁇ m or more, from the viewpoint of strength.
- retardation films include ⁇ /2 wavelength films, ⁇ /4 wavelength films, and viewing angle compensation films.
- Materials for the retardation film include, for example, polymer films birefringent by stretching.
- Polymeric films include, for example, cellulose films and polyester films.
- Cellulose films include, for example, triacetyl cellulose films.
- Polyester films include, for example, polyethylene terephthalate films and polyethylene naphthalate films.
- the thickness of the optical film 10 as a retardation film is, for example, 20 ⁇ m or more and, for example, 150 ⁇ m or less.
- a film comprising a substrate such as a cellulose film and an orientation layer of a liquid crystal compound such as a liquid crystalline polymer on the substrate can also be preferably used.
- the optical film 20 is a transparent protective film in this embodiment.
- the transparent protective film is, for example, a flexible transparent resin film.
- Materials for the transparent protective film include, for example, polyolefin, polyester, polyamide, polyimide, polyvinyl chloride, polyvinylidene chloride, cellulose, modified cellulose, polystyrene, and polycarbonate.
- Polyolefins include, for example, cycloolefin polymers (COP), polyethylene, polypropylene, ethylene-propylene copolymers, ethylene-vinyl acetate copolymers, and ethylene-vinyl alcohol copolymers.
- COP cycloolefin polymers
- Polyesters include, for example, polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate.
- Polyamides include, for example, polyamide 6, polyamide 6,6, and partially aromatic polyamides. Examples of modified cellulose include triacetyl cellulose. These materials may be used alone, or two or more of them may be used in combination.
- polyolefin is preferably used, and COP is more preferably used.
- the optical film 20 is preferably a uniaxially stretched film or a biaxially stretched film.
- the thickness of the optical film 20 is preferably 5 ⁇ m or more, more preferably 10 ⁇ m or more, and even more preferably 20 ⁇ m or more. From the viewpoint of thinning the laminated optical film X, the thickness of the optical film 20 is preferably 100 ⁇ m or less, more preferably 70 ⁇ m or less, and even more preferably 50 ⁇ m or less.
- the adhesive layer 30 is a cured adhesive composition.
- the adhesive layer 30 bonds directly to the optical film 10 and directly bonds to the optical film 20 .
- the adhesive composition contains a curable resin. The components of the adhesive composition are specifically described below.
- the thickness of the adhesive layer 30 is preferably 0.1 ⁇ m or more, more preferably 0.4 ⁇ m or more, even more preferably 0.7 ⁇ m or more, and particularly preferably 0.7 ⁇ m or more. 8 ⁇ m or more. From the viewpoint of thinning the laminated optical film X, the thickness of the adhesive layer 30 is preferably 5 ⁇ m or less, more preferably 3 ⁇ m or less, still more preferably 1.5 ⁇ m or less, and particularly preferably 1 ⁇ m or less.
- the adhesive layer 30 sandwiched between the optical films 10 and 20 has a side surface 31 recessed inwardly from the edges 11 and 21 of the optical films 10 and 20 (the edge 11 , 21 at the same position).
- the adhesive layer 30 has such recessed side surfaces 31.
- the adhesive layer 30 is suppressed from protruding from between the optical films 10 and 20 . Therefore, the laminated optical film X is suitable for suppressing the edge blocking described above. Suppression of edge blocking is useful for securing transportability and handleability during processing of the laminated optical film.
- the recess length L1 of the side surface 31 from the inner edge in the surface direction of the edges 11 and 21 is preferably 0.05 ⁇ m or more, more preferably 0.1 ⁇ m or more, and still more preferably 0.2 ⁇ m or more. .
- Such a configuration is preferable for suppressing the protrusion of the adhesive layer 30 from between the optical films 10 and 20, and is therefore preferable for suppressing edge blocking.
- the recess length L1 is defined by the innermost edge in the plane direction of the edges 11 and 21 of the optical films 10 and 20 and the innermost edge in the plane direction of the side surface 31 of the adhesive layer 30. is the distance in the plane direction between
- the recess length L1 is preferably 1.0 ⁇ m or less, more preferably 0.8 ⁇ m or less, and even more preferably 0.6 ⁇ m or less.
- Such a configuration is preferable for suppressing peeling between the optical films 10 and 20 at the edges of the laminated optical film X.
- FIG. For example, even in a high-temperature and high-humidity environment, the adhesive layer 30 between the optical films 10 and 20 can be peeled off while ensuring the bondability (heat shrinkage of the adhesive layer 30 during processing of the laminated optical film). It is preferable to suppress peeling due to large size.
- this configuration is also preferable for securing the reinforcing function of the adhesive layer 30 for the ends 10a, 20a of the optical films 10, 20 and securing the impact resistance of the ends 10a, 20a.
- the side surface 31 described above has a substantially linear shape at a position retreated from the edges 11 and 21 in the plane direction in the thickness direction cross section shown in FIG.
- the adhesive layer 30 may have a curved recessed side surface 31A as shown in FIG. The case of the same position in the direction is illustrated exemplarily).
- the side surface 31A has a curved, substantially V-shaped cross section in the thickness direction shown in FIG. It has a shape that gradually dents inward in the surface direction.
- the recess length L1 in the side surface 31A is between the innermost edge in the surface direction of the edges 11 and 21 of the optical films 10 and 20 and the innermost end (deepest portion) 31b in the surface direction of the side surface 31A. , is the distance in the plane direction.
- the adhesive layer 30 may have a partially recessed side surface 31B as shown in FIG. one case is illustrated by way of example). Further, the side surface 31B shown in FIG. 4 has an end surface F and an inclined surface D. The end surface F is on the side of the optical film 10 on the side surface 31B and is flush with the edge 11 .
- the inclined surface D is located on the optical film 20 side on the side surface 31B, and is inclined inward in the plane direction from the end face F toward the optical film 20 (the inclined surface D is closer to the optical film 20 toward the inner side in the plane direction).
- the side surface 31B may have a partially concave shape or an inclined surface (not shown) on the optical film 10 side, or a shape in which the intermediate portion in the thickness direction H is partially concave. (not shown).
- the recess length L1 on the side surface 31B is the length between the edges 11 and 21 of the optical films 10 and 20 on the inner side in the surface direction and the innermost end 31b of the side surface 31B in the surface direction.
- the first indentation elastic modulus of the adhesive layer 30 at 25° C. measured by the nanoindentation method is preferably 0.01 GPa or more, more preferably 0.03 GPa or more, still more preferably 0.05 GPa or more, and particularly preferably is 0.07 GPa or more (the first indentation elastic modulus is the indentation elastic modulus under the first measurement conditions.
- the first measurement conditions are as described later with regard to the examples, and under the first measurement conditions, the load
- the maximum indentation depth of the indenter with respect to the measurement sample during the application process is 200 nm). Such a configuration is preferable from the viewpoint of securing the bonding strength between the optical films 10 and 20 .
- the first indentation modulus is preferably 5 GPa or less, more preferably 3 GPa or less, and even more preferably 1 GPa or less.
- Methods for adjusting the indentation modulus of the adhesive layer 30 include, for example, adjusting the composition of the adhesive composition. Specifically, the adjustment of the number of functional groups of the polymerizable compound described later in the adhesive composition forming the adhesive layer 30, that is, the adjustment of the acrylic equivalent and epoxy equivalent of the polymerizable compound, is effective for the pressing of the adhesive layer 30. It is effective as an elastic modulus adjustment method.
- the nanoindentation method is a technique for measuring various physical properties of samples on a nanometer scale.
- the nanoindentation method is performed in compliance with ISO14577.
- a process of pushing an indenter into a sample set on a stage (loading process) and then a process of withdrawing the indenter from the sample (unloading process) are performed.
- the load acting between the indenter and the sample and the relative displacement of the indenter with respect to the sample are measured (load-displacement measurement). This makes it possible to obtain a load-displacement curve. From this load-displacement curve, it is possible to obtain various physical properties of the measurement sample based on nanometer scale measurements.
- a nanoindenter (trade name “Triboindenter”, manufactured by Hysitron) can be used for the load-displacement measurement of the cross section of the adhesive layer by the nanoindentation method. Specifically, it is as described later with respect to Examples.
- the second indentation elastic modulus of the adhesive layer 30 at 25° C. measured by the nanoindentation method is preferably 0.5 GPa or more, more preferably 1 GPa or more, still more preferably 1.5 GPa or more, and particularly preferably 2 GPa.
- the second indentation elastic modulus is the indentation elastic modulus under the second measurement conditions.
- the second measurement conditions are as described later with regard to the examples.
- the The maximum indentation depth of the indenter with respect to the measurement sample is 50 nm).
- Such a configuration is preferable from the viewpoint of securing the bonding strength between the optical films 10 and 20 . In addition, such a configuration helps ensure the aforementioned impact resistance in the optical films 10,20.
- the second indentation modulus is preferably 7 GPa or less, more preferably 5 GPa or less, and even more preferably 3 GPa or less. Such a configuration is preferable for ensuring flexibility of the adhesive layer 30 when the laminated optical film X is used for a repeatedly foldable display panel.
- the 90° peel strength of the optical film 20 to the optical film 10 at 25°C is preferably 1 N/15 mm or more, more preferably 1.2 N/15 mm or more, and still more preferably 1.5 N/15 mm or more. is.
- Such a configuration is preferable for achieving good bonding strength between the optical films 10 and 20, and particularly preferable for ensuring bonding strength between the optical films 10 and 20 for a foldable display panel.
- the 90° peel strength is, for example, 10 N/15 mm or less.
- the 90° peel strength can be measured using, for example, a Tensilon universal tester (product name: "RTC", manufactured by A&D).
- the measurement temperature is 25° C.
- the peeling angle is 90°
- the peeling speed is 1000 mm/min.
- a method for adjusting the 90° peel strength for example, adjustment of the composition of the adhesive composition can be mentioned.
- Specific examples of the method for adjusting the 90° peel strength include adjustment of the number of functional groups of the polymerizable compound described later in the adhesive composition, that is, adjustment of the acrylic equivalent and epoxy equivalent of the polymerizable compound.
- the ratio of the 90° peel strength (N/15mm) to the above-mentioned first indentation modulus (GPa) is preferably 5 or more, more preferably 10 or more, still more preferably 15 or more, and preferably 30 or less, It is more preferably 25 or less.
- the ratio of the 90° peel strength (N/15mm) to the above-mentioned second indentation modulus (GPa) is preferably 0.2 or more, more preferably 0.3 or more, still more preferably 0.4 or more, and , preferably 5 or less, more preferably 3 or less, and still more preferably 2 or less.
- the adhesive layer 30 is, for example, a cured product of an adhesive composition (active energy ray-curable composition) containing an active energy ray-curable resin.
- Active energy ray-curable compositions include, for example, electron beam-curable compositions, UV-curable compositions, and visible light-curable compositions.
- the active energy ray-curable composition is either one or both of a radically polymerizable composition and a cationic polymerizable composition in the present embodiment.
- the composition contains a radically polymerizable compound as a monomer.
- a radically polymerizable compound is a compound having a radically polymerizable functional group.
- examples of radically polymerizable functional groups include ethylenically unsaturated bond-containing groups.
- Ethylenically unsaturated bond-containing groups include, for example, (meth)acryloyl groups, vinyl groups, and allyl groups.
- a (meth)acryloyl group means an acryloyl group and/or a methacryloyl group.
- the active energy ray-curable composition preferably contains a radically polymerizable compound having a (meth)acryloyl group as a main component.
- a main component means the component with the largest mass ratio.
- the proportion of the (meth)acryloyl group-containing radically polymerizable compound in the active energy ray-curable composition is, for example, 50% by mass or more, preferably 70% by mass or more, and more preferably 80% by mass or more.
- the radically polymerizable compound includes a monofunctional radically polymerizable compound and a difunctional or higher polyfunctional radically polymerizable compound.
- Examples of monofunctional radically polymerizable compounds include (meth)acrylamide derivatives having a (meth)acrylamide group.
- (Meth)acrylamide derivatives include N-alkyl group-containing (meth)acrylamide derivatives, N-hydroxyalkyl group-containing (meth)acrylamide derivatives, N-aminoalkyl group-containing (meth)acrylamide derivatives, N-alkoxy group-containing (meth)acrylamide derivatives, ) acrylamide derivatives and N-mercaptoalkyl group-containing (meth)acrylamide derivatives.
- N-alkyl group-containing (meth)acrylamide derivatives include, for example, N-methyl(meth)acrylamide, N,N-dimethyl(meth)acrylamide, N,N-diethyl(meth)acrylamide, N-isopropyl(meth)acrylamide , N-butyl(meth)acrylamide, and N-hexyl(meth)acrylamide, preferably N,N-diethylacrylamide is used.
- N-hydroxyalkyl group-containing (meth)acrylamide derivatives include, for example, N-methylol(meth)acrylamide, N-hydroxyethyl(meth)acrylamide, and N-methylol-N-propane(meth)acrylamide, preferably is N-hydroxyethyl acrylamide.
- the (meth)acrylamide derivatives may be used alone, or two or more of them may be used in combination.
- Examples of monofunctional radically polymerizable compounds include (meth)acrylic acid derivatives having a (meth)acryloyloxy group.
- Examples of the (meth)acrylic acid derivative include (meth)acrylic acid alkyl esters and (meth)acrylic acid derivatives other than (meth)acrylic acid alkyl esters.
- the (meth)acrylic acid derivatives may be used alone, or two or more of them may be used in combination.
- (Meth)acrylic acid alkyl esters include, for example, methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, isopropyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, ) acrylate, n-pentyl (meth) acrylate, 2,2-dimethylbutyl (meth) acrylate, n-hexyl (meth) acrylate, n-octyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, 4-methyl- 2-propylpentyl (meth)acrylate, and n-octadecyl (meth)acrylate.
- Examples of (meth)acrylic acid derivatives other than (meth)acrylic acid alkyl esters include (meth)acrylic acid cycloalkyl esters, (meth)acrylic acid aralkyl esters, hydroxyl group-containing (meth)acrylic acid derivatives, alkoxy group-containing ( Examples include meth)acrylic acid derivatives and phenoxy group-containing (meth)acrylic acid derivatives.
- (Meth)acrylic acid cycloalkyl esters include, for example, cyclohexyl (meth)acrylate and cyclopentyl (meth)acrylate.
- (Meth)acrylic acid aralkyl esters include, for example, benzyl (meth)acrylate and 3-phenoxybenzyl (meth)acrylate.
- hydroxyl group-containing (meth)acrylic acid derivatives include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, 4 -hydroxybutyl (meth)acrylate, [4-(hydroxymethyl)cyclohexyl]methyl acrylate, and 2-hydroxy-3-phenoxypropyl (meth)acrylate.
- Alkoxy group-containing (meth)acrylic acid derivatives include, for example, 2-methoxyethyl (meth)acrylate, 2-ethoxyethyl (meth)acrylate, and 3-methoxybutyl (meth)acrylate.
- Phenoxy group-containing (meth)acrylic acid derivatives include, for example, phenoxyethyl (meth)acrylate and phenoxydiethylene glycol (meth)acrylate.
- the (meth)acrylic acid derivative other than the (meth)acrylic acid alkyl ester is preferably at least one selected from the group consisting of 3-phenoxybenzyl acrylate, 2-hydroxy-3-phenoxypropyl acrylate, and phenoxydiethylene glycol acrylate. one is used.
- Carboxyl group-containing monomers are also included as monofunctional radically polymerizable compounds.
- Carboxyl group-containing monomers include, for example, (meth)acrylic acid, carboxyethyl acrylate, carboxypentyl acrylate, itaconic acid, maleic acid, fumaric acid, crotonic acid, and isocrotonic acid.
- the monofunctional radically polymerizable compound also includes a lactam-based vinyl monomer.
- Lactamic vinyl monomers include, for example, N-vinyl-2-pyrrolidone, N-vinyl- ⁇ -caprolactam, and methylvinylpyrrolidone.
- Examples of monofunctional radically polymerizable compounds include vinyl-based monomers having nitrogen-containing heterocycles.
- Such monomers include, for example, vinylpyridine, vinylpiperidone, vinylpyrimidine, vinylpiperazine, vinylpyrazine, vinylpyrrole, vinylimidazole, vinyloxazole, and vinylmorpholine.
- polyfunctional radically polymerizable compounds include tripropylene glycol di(meth)acrylate, tetraethylene glycol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, 1,9-nonanediol di(meth)acrylate.
- acrylate 1,10-decanediol diacrylate, 2-ethyl-2-butylpropanediol di(meth)acrylate, neopentyl glycol di(meth)acrylate, tricyclodecanedimethanol di(meth)acrylate, cyclic trimethylol propane formal (meth)acrylate, dioxane glycol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, and dipentaerythritol hexa(meth)acrylate are used, preferably tripropylene glycol diacrylate.
- the polyfunctional radically polymerizable compounds may be used alone, or two or more of them may be used in combination.
- a polyfunctional radically polymerizable compound
- the active energy ray curable composition When the active energy ray-curable composition is an ultraviolet curable composition or a visible light curable composition, the active energy ray curable composition preferably contains a photopolymerization initiator.
- Photoinitiators include, for example, benzophenone compounds, benzoin ether compounds, and thioxanthone compounds.
- Benzophenone compounds include, for example, benzyl, benzophenone, benzoylbenzoic acid, and 3,3'-dimethyl-4-methoxybenzophenone.
- Benzoin ether compounds include, for example, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, and benzoin butyl ether.
- Thioxanthone compounds include, for example, thioxanthone, 2-chlorothioxanthone, 2-methylthioxanthone, 2,4-dimethylthioxanthone, isopropylthioxanthone, 2,4-dichlorothioxanthone, 2,4-diethylthioxanthone, 2,4-diisopropylthioxanthone, and dodecylthioxanthone.
- a photopolymerization initiator that is highly sensitive to light of 380 nm or longer is preferably used.
- photopolymerization initiators include, for example, 2-methyl-1-(4-methylthiophenyl)-2-morpholinopropan-1-one, 2-benzyl-2-dimethylamino-1-(4-morphol linophenyl)-butanone-1,2-(dimethylamino)-2-[(4-methylphenyl)methyl]-1-[4-(4-morpholinyl)phenyl]-1-butanone, 2,4,6- trimethylbenzoyl-diphenyl-phosphine oxide, bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide, and bis( ⁇ 5-2,4-cyclopentadien-1-yl)-bis(2,6-difluoro -3-(1H-pyrrol-1-yl)-
- 2,4-diethylthioxanthone and/or 2-methyl-1-(4-methylthiophenyl)-2-morpholinopropan-1-one are preferably used.
- the content of the photopolymerization initiator in the active energy ray-curable composition is preferably 0.1 parts by mass or more, more preferably 0.05 parts by mass with respect to 100 parts by mass of the curable component (radical polymerizable compound). Above, more preferably 0.1 parts by mass or more, preferably 20 parts by mass or less, more preferably 10 parts by mass or less, and even more preferably 5 parts by mass or less.
- the composition contains a cationic polymerizable compound as a monomer.
- the cationically polymerizable compound is a compound having a cationically polymerizable functional group, and includes a monofunctional cationically polymerizable compound having one cationically polymerizable functional group and a polyfunctional cationically polymerizable compound having two or more cationically polymerizable functional groups. compounds.
- a monofunctional cationic polymerizable compound has a relatively low liquid viscosity. By adding such a monofunctional cationically polymerizable compound to the resin composition, the viscosity of the resin composition can be lowered.
- monofunctional cationically polymerizable compounds often have functional groups that exhibit various functions.
- various functions can be expressed in the resin composition and/or the cured product of the resin composition.
- the resin composition containing the polyfunctional cationically polymerizable compound by curing the resin composition containing the polyfunctional cationically polymerizable compound, a cured product having a three-dimensional crosslinked portion is obtained (the polyfunctional cationically polymerizable compound functions as a crosslinking agent). From such a point of view, it is preferable to use polyfunctional cationically polymerizable compounds.
- the amount of the polyfunctional cationically polymerizable compound relative to 100 parts by weight of the monofunctional cationically polymerizable compound is, for example, 10 parts by weight or more. It is 1000 mass parts or less.
- Cationic polymerizable functional groups include, for example, epoxy groups, oxetanyl groups, and vinyl ether groups.
- Compounds having an epoxy group include, for example, aliphatic epoxy compounds, alicyclic epoxy compounds, and aromatic epoxy compounds.
- an alicyclic epoxy compound is preferably used from the viewpoint of curability and adhesiveness of the cationic polymerizable composition.
- the alicyclic epoxy compounds include, for example, 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate, or caprolactone-modified 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate, Examples include trimethylcaprolactone-modified products and valerolactone-modified products.
- Examples of commercially available alicyclic epoxy compounds include Celoxide 2021, Celoxide 2021A, Celoxide 2021P, Celoxide 2081, Celoxide 2083, and Celoxide 2085 (manufactured by Daicel Chemical Industries, Ltd.), and Cyracure UVR-6105.
- Cyracure UVR-6107 Cyracure 30, and R-6110 (manufactured by Dow Chemical Japan). From the viewpoint of improving curability and reducing viscosity of the cationic polymerizable composition, it is preferable to use a compound having an oxetanyl group and/or a compound having a vinyl ether group.
- Compounds having an oxetanyl group include, for example, 3-ethyl-3-hydroxymethyloxetane, 1,4-bis[(3-ethyl-3-oxetanyl)methoxymethyl]benzene, 3-ethyl-3-(phenoxymethyl) oxetane, di[(3-ethyl-3-oxetanyl)methyl]ether, 3-ethyl-3-(2-ethylhexyloxymethyl)oxetane, and phenol novolac oxetane.
- oxetanyl group examples include, for example, Aron oxetane OXT-101, Aron oxetane OXT-121, Aron oxetane OXT-211, Aron oxetane OXT-221, and Aron oxetane OXT-212 (manufactured by Toagosei Co., Ltd.). is mentioned.
- Examples of compounds having a vinyl ether group include 2-hydroxyethyl vinyl ether, diethylene glycol monovinyl ether, 4-hydroxybutyl vinyl ether, diethylene glycol vinyl ether, triethylene glycol divinyl ether, cyclohexanedimethanol divinyl ether, cyclohexanedimethanol monovinyl ether, tricyclo.
- the active energy ray curable composition When the active energy ray-curable composition is an ultraviolet curable composition or a visible light curable composition, the active energy ray curable composition contains a photocationic polymerization initiator.
- a photocationic polymerization initiator generates cationic species or Lewis acid upon irradiation with active energy rays (visible light, ultraviolet rays, X-rays, electron beams, etc.) and initiates the polymerization reaction of the cationic polymerizable functional groups.
- the photocationic polymerization initiator includes a photoacid generator and a photobase generator, preferably a photoacid generator.
- the active energy ray-curable composition is used as a visible light-curable composition, it is preferable to use a cationic photopolymerization initiator that is particularly sensitive to light of 380 nm or more. Moreover, when a photocationic polymerization initiator is used, it is preferable to use together a photosensitizer showing maximum absorption of light having a wavelength longer than 380 nm.
- a photocationic polymerization initiator is generally a compound that exhibits maximum absorption in a wavelength region near or shorter than 300 nm. Long wavelength light can be effectively used to promote the generation of cationic species or Lewis acids from the photocationic polymerization initiator.
- photosensitizers include anthracene compounds, pyrene compounds, carbonyl compounds, organic sulfur compounds, persulfides, redox compounds, azo compounds, diazo compounds, halogen compounds, and photoreducible dyes. These may be used alone, or two or more of them may be used in combination. In particular, an anthracene compound is preferable because of its excellent photosensitizing effect.
- commercially available anthracene compounds as photosensitizers include, for example, Anthracure UVS-1331 and Anthracure UVS-1221 (manufactured by Kawasaki Kasei Co., Ltd.). The content of the photosensitizer in the composition is, for example, 0.1 to 5% by weight.
- the active energy ray-curable composition may contain an oligomer.
- Oligomers include acrylic oligomers, fluorine oligomers, and silicone oligomers, preferably acrylic oligomers.
- Incorporation of the oligomer into the active energy ray-curable composition is useful for suppressing shrinkage of the composition upon curing. Suppression of cure shrinkage of the active energy ray-curable composition is preferable for reducing interfacial stress between the formed adhesive layer 30 and the optical films 10 and 20 . Suppression of interfacial stress is useful for securing bonding strength between the optical films 10 and 20 .
- Examples of (meth)acrylic monomers that form acrylic oligomers include (meth)acrylic acid alkyl esters having 1 to 20 carbon atoms, cycloalkyl (meth)acrylates, aralkyl (meth)acrylates, polycyclic (meth)acrylates, Examples include hydroxyl group-containing (meth)acrylic acid esters and halogen-containing (meth)acrylic acid esters.
- (Meth)acrylic acid alkyl esters for example, methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, isopropyl (meth)acrylate, 2-methyl-2-nitropropyl (meth)acrylate , n-butyl (meth)acrylate, isobutyl (meth)acrylate, S-butyl (meth)acrylate, t-butyl (meth)acrylate, n-pentyl (meth)acrylate, t-pentyl (meth)acrylate, 3-pentyl (Meth)acrylate, 2,2-dimethylbutyl (meth)acrylate, n-hexyl (meth)acrylate, cetyl (meth)acrylate, n-octyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, 4-methyl- 2-propylpentyl (meth)acrylate
- Cycloalkyl (meth)acrylates include, for example, cyclohexyl (meth)acrylate and cyclopentyl (meth)acrylate.
- Aralkyl (meth)acrylates include, for example, benzyl (meth)acrylate.
- Polycyclic (meth)acrylates include, for example, 2-isobornyl (meth)acrylate, 2-norbornylmethyl (meth)acrylate, 5-norbornen-2-yl-methyl (meth)acrylate, and 3-methyl- 2-Norbornylmethyl (meth)acrylate can be mentioned.
- hydroxyl group-containing (meth)acrylic acid esters examples include hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, and 2,3-dihydroxypropylmethyl-butyl (meth)methacrylate.
- Halogen-containing (meth)acrylic acid esters include, for example, 2,2,2-trifluoroethyl (meth)acrylate, 2,2,2-trifluoroethylethyl (meth)acrylate, tetrafluoropropyl (meth)acrylate, hexafluoropropyl (meth)acrylate, octafluoropentyl (meth)acrylate, heptadecafluorodecyl (meth)acrylate. These (meth)acrylates may be used alone, or two or more of them may be used in combination.
- the weight average molecular weight (Mw) of the acrylic oligomer is preferably 15,000 or less, more preferably 10,000 or less, even more preferably 5,000 or less. Mw of the acrylic oligomer is preferably 500 or more, more preferably 1000 or more, and even more preferably 1500 or more.
- the content of the acrylic oligomer in the active energy ray-curable composition is preferably 2% by mass or more, more preferably 4% by mass or more, and is preferably 20% by mass or less, more preferably 15% by mass or less. .
- the active energy ray-curable composition may contain other components.
- Other ingredients include silane coupling agents, leveling agents, surfactants, plasticizers, and UV absorbers.
- the blending amount of the other component is preferably 10 parts by mass or less, more preferably 5 parts by mass or less, and still more preferably 3 parts by mass or less with respect to 100 parts by mass of the curable component. Part by mass or more.
- the viscosity of the active energy ray-curable composition at 25° C. is preferably 3 mPa ⁇ s or more, more preferably 5 mPa ⁇ s or more, and still more preferably 10 mPa ⁇ s or more, from the viewpoint of coatability in the coating step described later. and is preferably 100 mPa ⁇ s or less, more preferably 50 mPa ⁇ s or less, and still more preferably 30 mPa ⁇ s or less.
- the viscosity of the composition is a value measured with an E-type viscometer (cone plate type viscometer).
- the laminated optical film X can be produced, for example, as follows.
- an active energy ray-curable composition is applied to one side (surface to be bonded) of one optical film (optical film 10 or optical film 20) to form a coating film of the composition (application step).
- the surface to be bonded of the optical film may be subjected to a surface modification treatment.
- Surface modification treatments include corona treatment, plasma treatment, excimer-treatment, and flame treatment.
- Examples of coating methods in this step include reverse coaters, gravure coaters, bar reverse coaters, roll coaters, die coaters, bar coaters, and rod coaters.
- the other optical film (optical film 20 or optical film 10) is attached to one optical film via the composition coating film.
- a roll laminator can be used for lamination.
- the composition coating film between the optical films 10 and 20 is irradiated with an active energy ray to cure the coating film (active energy ray-curable composition) to form the adhesive layer 30 (adhesion
- the adhesive layer 30 is not a pressure sensitive adhesive layer).
- the optical films 10 and 20 are joined via the adhesive layer 30, and the raw material film of the laminated optical film X is obtained.
- Electron beams, ultraviolet rays, and visible rays can be used as active energy rays.
- Examples of electron beam irradiation means include an electron beam accelerator.
- Ultraviolet and visible light sources include, for example, LED lights, gallium-filled metal halide lamps, low-pressure mercury lamps, medium-pressure mercury lamps, high-pressure mercury lamps, ultra-high pressure mercury lamps, xenon lamps, halogen lamps, and gallium lamps.
- a wavelength cut filter for cutting a part of the wavelength range of ultraviolet rays and/or visible light emitted from the light source may be used as needed.
- At least a portion of the peripheral edge of the raw material film is contoured (outer contouring step). For example, one longitudinal end of a roll-shaped raw material film is trimmed. For example, a roll-shaped raw material film is cut into sheets.
- contour processing methods include laser processing such as CO 2 laser irradiation, cutting with a cutting blade, cutting with a punch blade, and end mill processing.
- the adhesive layer 30 is caused to undergo a relatively large heat shrinkage at the outer shape processing portion of the raw material film, and the side surface 31 is recessed inward from the edges 11 and 21 of the optical films 10 and 20. (or side 31A).
- the adhesive layer 30 is formed so that the whole or part of the side surface 31 of the adhesive layer 30 at the end of the raw material film is retracted inward in the plane direction from the edges 11 and 21 of the optical films 10 and 20 . can contract to form a recessed side 31 (or side 31A).
- the length by which the end portion of the adhesive layer 30 shrinks, that is, the recess length L1 can be adjusted, for example, by adjusting the composition of the adhesive layer 30 and the CO 2 laser irradiation conditions.
- the side surface 31 (or the side surfaces 31A, 31B) recessed inwardly from the edges 11, 21 of the optical films 10, 20 is cut.
- Methods for adjusting the position and extent of partial removal include, for example, adjusting the difference in elastic modulus between the optical films 10 and 20 and the adhesive layer 30, adjusting the thermal shrinkage rate of the adhesive layer 30, and adjusting the thickness. and adjustment of the frictional force generated between the cutting blade and the adhesive layer 30 during cutting.
- the frictional force can be adjusted, for example, by the composition of the adhesive layer 30 .
- the laminated optical film X can be manufactured as described above.
- Example 1 The following components were mixed at 25°C for 1 hour to prepare an adhesive composition.
- the adhesive composition was applied onto a 23 ⁇ m thick COP film (product name “Zeonor Film ZF14”, manufactured by Nippon Zeon Co., Ltd.) as a transparent protective film to form an adhesive coating film of 1 ⁇ m thick.
- COP film product name “Zeonor Film ZF14”, manufactured by Nippon Zeon Co., Ltd.
- MCD coater manufactured by Fuji Machine Co., Ltd.
- the polarizer film was attached to the transparent protective film via the adhesive coating film on the same film.
- the adhesive coating between the films was cured by irradiating the adhesive coating with ultraviolet rays from the transparent protective film side.
- UV irradiation an ultraviolet irradiation apparatus (product name: "Light HAMMER10", bulb: V bulb, manufactured by Fusion UV Systems, Inc.) equipped with a gallium-encapsulated metal halide lamp as a light source was used.
- the peak illuminance was 1600 mW/cm 2 and the cumulative irradiance was 1000 mJ/cm 2 (wavelength 380 to 440 nm) (illuminance was measured using the “Sola-Check system” manufactured by Solatell. ).
- the transparent protective film and the polarizer film were bonded to obtain a laminated optical film.
- the laminated optical film was trimmed.
- the laminated optical film was cut in the thickness direction by irradiation with a CO 2 laser to obtain a laminated optical film having a predetermined plan view shape.
- the wavelength was 9.4 ⁇ m
- the power was 48 W
- the scanning speed was 500 mm/sec.
- the laminated optical film was then left at room temperature for 24 hours.
- the laminated optical film of Example 1 was produced as described above.
- the laminated optical film of Example 1 includes a polarizer film (5 ⁇ m thick), an adhesive layer, and a transparent protective film (23 ⁇ m thick) in this order in the thickness direction.
- Example 2 The laminated optical film of Example 2 was prepared in the same manner as the laminated optical film of Example 1, except that the amount of "Aronix M-220", which is one of the monomer components, was changed from 5 parts by weight to 2 parts by weight. (Polarizer film/adhesive layer/transparent protective film) was produced.
- Example 3 The laminated optical film of Example 3 was prepared in the same manner as the laminated optical film of Example 1, except that the amount of "Aronix M-220", which is one of the monomer components, was changed from 5 parts by mass to 1 part by mass. (Polarizer film/adhesive layer/transparent protective film) was produced.
- Comparative Example 1 A laminated optical film of Comparative Example 1 was prepared in the same manner as the laminated optical film of Example 1, except that the amount of "Aronix M-220", which is one of the monomer components, was changed from 5 parts by weight to 3 parts by weight. (Polarizer film/adhesive layer/transparent protective film) was produced.
- the indentation elastic modulus of the adhesive layer in each of the laminated optical films of Examples 1 to 3 and Comparative Example 1 was measured by the nanoindentation method. Specifically, first, a film piece (laminated optical film) having a size of 5 mm ⁇ 10 mm was cut out from the laminated optical film. Next, the laminated optical film was cut by a cryomicrotome method. Specifically, the laminated optical film was cooled to ⁇ 30° C., cut with a hard knife in the thickness direction of the same film, and then returned to room temperature. Thus, a sample for measurement was obtained.
- load-displacement measurement was performed using a nanoindenter under the same measurement conditions as the first measurement conditions (second measurement conditions) except that the maximum indentation depth was changed from 200 nm to 50 nm. Then, the obtained measurement data was processed by the dedicated analysis software (Ver. 9.4.0.1) of "TI950 Triboindenter" to calculate the indentation modulus of the adhesive layer.
- the laminated optical film of the present invention can be used, for example, as an element included in the laminated structure of a display panel such as a foldable display panel.
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Abstract
Description
下記の成分を、25℃で1時間混合し、接着剤組成物を調製した。
25質量部のフェノキシジエチレングリコールアクリレート(品名「ライトアクリレートP2H-A」,モノマー,共栄社化学社製)
5質量部のトリプロピレングリコールジアクリレート(品名「アロニックス M-220」,モノマー,東亞合成社製)
10質量部の2-ヒドロキシ-3-フェノキシプロピルアクリレート(品名「アロニックス M-5700」,モノマー,東亞合成社製)
5質量部のヒドロキシエチルアクリルアミド(品名「HEAA」,モノマー,KJケミカルズ社製)
5質量部のジエチルアクリルアミド(品名「DEAA」,モノマー,KJケミカルズ社製)
3質量部の2-メチル-1-(4-メチルチオフェニル)-2-モルフォリノプロパン-1-オン(品名「OMINIRAD907」,光重合開始剤,IGM Resins社製)
3質量部の2,4-ジエチルチオキサントン(品名「KAYACURE DETX-S」,光重合開始剤,日本化薬社製)
5質量部のアクリルオリゴマー(品名「アルフォン1190」,粘度6000mPa・s(25℃),Mw1700,Tg -50℃,東亞合成社製)
0.5質量部の、アクリル基を有する変性ポリジメチルシロキサン(品名「BYK-UV3505」,レベリング剤,BYK社製)
モノマー成分の一つである「アロニックス M-220」の配合量を5質量部に代えて2質量部としたこと以外は実施例1の積層光学フィルムと同様にして、実施例2の積層光学フィルム(偏光子フィルム/接着剤層/透明保護フィルム)を作製した。
モノマー成分の一つである「アロニックス M-220」の配合量を5質量部に代えて1質量部としたこと以外は実施例1の積層光学フィルムと同様にして、実施例3の積層光学フィルム(偏光子フィルム/接着剤層/透明保護フィルム)を作製した。
モノマー成分の一つである「アロニックス M-220」の配合量を5質量部に代えて3質量部としたこと以外は実施例1の積層光学フィルムと同様にして、比較例1の積層光学フィルム(偏光子フィルム/接着剤層/透明保護フィルム)を作製した。
実施例1~3および比較例1の各積層光学フィルムにおける接着剤層の押込み弾性率を、ナノインデンテーション法によって測定した。具体的には、まず、積層光学フィルムから、5mm×10mmのサイズのフィルム片(積層光学フィルム)を切り出した。次に、クライオミクロトーム法により、積層光学フィルムを切削した。具体的には、積層光学フィルムを、-30℃に冷却したうえで、同フィルムの厚さ方向に硬質ナイフで切削し、その後に室温に戻した。これにより、測定用の試料を得た。次に、ナノインデンター(品名「TI950 Triboindenter」,Hysitron社製)を使用して、測定試料における接着剤層の露出表面に対する荷重-変位測定をJIS Z 2255:2003に準拠して実施し、荷重-変位曲線を得た。本測定では、測定モードは単一押込み測定とし、測定温度は25℃とし、使用圧子はBerkovich(三角錐)型のダイヤモンド圧子とし、荷重印加過程での測定試料に対する圧子の最大押込み深さ(最大変位hmax)は200nmとし、その圧子の押込み速度は10nm/秒とし、除荷過程での測定試料からの圧子の引抜き速度は10nm/秒とした(第1測定条件)。そして、得られた測定データを「TI950 Triboindenter」の専用解析ソフト(Ver. 9.4.0.1)によって処理した。具体的には、得られた荷重(f)-変位(h)曲線に基づき、最大荷重fmax(最大変位hmaxにて圧子に作用する荷重)と、接触投影面積S(最大荷重時における圧子と試料との間の接触領域の投影面積)と、除荷過程開始時における荷重-変位曲線の接線の傾きDとを得た。そして、傾きDと接触投影面積Sから、接着剤層の押込み弾性率(=(π1/2D)/(2S1/2))を算出した。
実施例1~3および比較例1の各積層光学フィルムについて、端部の縦断面形状を調べた。具体的には、まず、積層光学フィルムの周端部から任意に選択した箇所を厚さ方向に切断し、観察用の縦断面を形成した。次に、当該縦断面を光学顕微鏡によって観察および撮影した。そして、実施例1~3の各積層光学フィルムの観察断面においては、接着剤層の端縁(側面)が、フィルム面方向において偏光子フィルムの端縁(第1端縁)および透明保護フィルムの端縁(第2端縁)よりも内側にあることを、確認した。比較例1の積層光学フィルムの観察断面においては、接着剤層の端縁(側面)が、フィルム面方向において偏光子フィルムの端縁(第1端縁)および透明保護フィルムの端縁(第2端縁)よりも外側にあることを、確認した。
実施例1~3および比較例1の各積層光学フィルムの耐衝撃性について、上記の観察断面において偏光子フィルムおよび透明保護フィルムの両方に損傷(クラックおよび欠けなど)が生じていない場合を“良”と評価し、偏光子フィルムおよび透明保護フィルムの少なくとも一方に損傷が生じている場合を“不良”と評価した。その評価結果を表1に示す。
H 厚さ方向
10 光学フィルム(第1光学フィルム)
10a 端部
11 端縁(第1端縁)
20 光学フィルム(第2光学フィルム)
20a 端部
21 端縁(第2端縁)
30 接着剤層
31,31A,31B 側面
31a,31b 端
Claims (3)
- 第1光学フィルムと、接着剤層と、第2光学フィルムとを厚さ方向に順に備える積層光学フィルムであって、
前記接着剤層が、前記第1光学フィルムに接合し、且つ前記第2光学フィルムに接合し、
前記接着剤層が、前記厚さ方向と直交する面方向において、前記第1光学フィルムの第1端縁および前記第2光学フィルムの第2端縁よりも内方に凹む側面を有する、積層光学フィルム。 - 前記第1端縁および前記第2端縁のうち前記面方向内側にある端縁からの、前記側面の凹み長さが、0.05μm以上である、請求項1に記載の積層光学フィルム。
- 前記第1端縁および前記第2端縁のうち前記面方向内側にある端縁からの、前記側面の凹み長さが、1.0μm以下である、請求項1または2に記載の積層光学フィルム。
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JP2016206640A (ja) * | 2015-04-17 | 2016-12-08 | 日東電工株式会社 | 偏光板およびその製造方法 |
JP2017021323A (ja) * | 2015-07-07 | 2017-01-26 | 住友化学株式会社 | 偏光板の製造方法 |
JP2017097223A (ja) * | 2015-11-26 | 2017-06-01 | 住友化学株式会社 | 粘着剤層付き偏光板、及び画像表示装置 |
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