CN117098656A - Laminated optical film - Google Patents
Laminated optical film Download PDFInfo
- Publication number
- CN117098656A CN117098656A CN202280022929.7A CN202280022929A CN117098656A CN 117098656 A CN117098656 A CN 117098656A CN 202280022929 A CN202280022929 A CN 202280022929A CN 117098656 A CN117098656 A CN 117098656A
- Authority
- CN
- China
- Prior art keywords
- optical film
- meth
- film
- adhesive layer
- acrylate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- 239000012788 optical film Substances 0.000 title claims abstract description 203
- 239000012790 adhesive layer Substances 0.000 claims abstract description 108
- 239000010408 film Substances 0.000 claims description 131
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 97
- 239000000203 mixture Substances 0.000 description 87
- 150000001875 compounds Chemical class 0.000 description 56
- 238000000576 coating method Methods 0.000 description 43
- -1 polyethylene terephthalate Polymers 0.000 description 42
- 239000011248 coating agent Substances 0.000 description 41
- 230000001681 protective effect Effects 0.000 description 41
- 239000000853 adhesive Substances 0.000 description 30
- 230000001070 adhesive effect Effects 0.000 description 30
- 238000005259 measurement Methods 0.000 description 27
- 238000000034 method Methods 0.000 description 25
- 238000005452 bending Methods 0.000 description 20
- 239000000178 monomer Substances 0.000 description 17
- 150000003254 radicals Chemical class 0.000 description 17
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical group NC(=O)C=C HRPVXLWXLXDGHG-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
- 238000007373 indentation Methods 0.000 description 15
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical class CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 13
- 238000006073 displacement reaction Methods 0.000 description 12
- 125000000524 functional group Chemical group 0.000 description 11
- 239000004593 Epoxy Substances 0.000 description 10
- 150000001252 acrylic acid derivatives Chemical class 0.000 description 9
- 239000003999 initiator Substances 0.000 description 8
- 125000000217 alkyl group Chemical group 0.000 description 7
- 238000010538 cationic polymerization reaction Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 239000003505 polymerization initiator Substances 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 229920002678 cellulose Polymers 0.000 description 6
- 235000010980 cellulose Nutrition 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 238000010894 electron beam technology Methods 0.000 description 6
- AHHWIHXENZJRFG-UHFFFAOYSA-N oxetane Chemical compound C1COC1 AHHWIHXENZJRFG-UHFFFAOYSA-N 0.000 description 6
- 229920005989 resin Polymers 0.000 description 6
- 239000011347 resin Substances 0.000 description 6
- 239000011342 resin composition Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 239000004372 Polyvinyl alcohol Substances 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 239000003504 photosensitizing agent Substances 0.000 description 5
- 229920002451 polyvinyl alcohol Polymers 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 5
- 238000011084 recovery Methods 0.000 description 5
- 230000001629 suppression Effects 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
- QYKIQEUNHZKYBP-UHFFFAOYSA-N Vinyl ether Chemical group C=COC=C QYKIQEUNHZKYBP-UHFFFAOYSA-N 0.000 description 4
- 150000003926 acrylamides Chemical class 0.000 description 4
- 125000002723 alicyclic group Chemical group 0.000 description 4
- 125000003710 aryl alkyl group Chemical group 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 125000002091 cationic group Chemical group 0.000 description 4
- 239000001913 cellulose Substances 0.000 description 4
- 125000000753 cycloalkyl group Chemical group 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
- 230000000704 physical effect Effects 0.000 description 4
- 230000002040 relaxant effect Effects 0.000 description 4
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 4
- 229920002554 vinyl polymer Polymers 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
- 238000010521 absorption reaction Methods 0.000 description 3
- 238000013329 compounding Methods 0.000 description 3
- 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 3
- 238000011156 evaluation Methods 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
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 3
- 125000003566 oxetanyl group Chemical group 0.000 description 3
- 229920000098 polyolefin Polymers 0.000 description 3
- 239000000126 substance Substances 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
- XLPJNCYCZORXHG-UHFFFAOYSA-N 1-morpholin-4-ylprop-2-en-1-one Chemical compound C=CC(=O)N1CCOCC1 XLPJNCYCZORXHG-UHFFFAOYSA-N 0.000 description 2
- WULAHPYSGCVQHM-UHFFFAOYSA-N 2-(2-ethenoxyethoxy)ethanol Chemical compound OCCOCCOC=C WULAHPYSGCVQHM-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
- 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
- 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 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
- AAWINMXGBBFQRZ-UHFFFAOYSA-N 3-hydroxy-2,2-dimethylpropanoic acid;(3-hydroxy-2,2-dimethylpropyl) prop-2-enoate Chemical compound OCC(C)(C)C(O)=O.OCC(C)(C)COC(=O)C=C AAWINMXGBBFQRZ-UHFFFAOYSA-N 0.000 description 2
- OZJPLYNZGCXSJM-UHFFFAOYSA-N 5-valerolactone Chemical compound O=C1CCCCO1 OZJPLYNZGCXSJM-UHFFFAOYSA-N 0.000 description 2
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 2
- PGDIJTMOHORACQ-UHFFFAOYSA-N 9-prop-2-enoyloxynonyl prop-2-enoate Chemical compound C=CC(=O)OCCCCCCCCCOC(=O)C=C PGDIJTMOHORACQ-UHFFFAOYSA-N 0.000 description 2
- 101100064324 Arabidopsis thaliana DTX48 gene Proteins 0.000 description 2
- 229920002284 Cellulose triacetate Polymers 0.000 description 2
- 229920000089 Cyclic olefin copolymer Polymers 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-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
- BAPJBEWLBFYGME-UHFFFAOYSA-N Methyl acrylate Chemical compound COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 description 2
- 239000004952 Polyamide Substances 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
- 125000003647 acryloyl group Chemical group O=C([*])C([H])=C([H])[H] 0.000 description 2
- 125000003545 alkoxy group Chemical group 0.000 description 2
- MWPLVEDNUUSJAV-UHFFFAOYSA-N anthracene Natural products C1=CC=CC2=CC3=CC=CC=C3C=C21 MWPLVEDNUUSJAV-UHFFFAOYSA-N 0.000 description 2
- 239000012965 benzophenone Substances 0.000 description 2
- 125000001797 benzyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])* 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- 150000001768 cations Chemical class 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 239000003431 cross linking reagent Substances 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
- 238000004043 dyeing Methods 0.000 description 2
- BXKDSDJJOVIHMX-UHFFFAOYSA-N edrophonium chloride Chemical compound [Cl-].CC[N+](C)(C)C1=CC=CC(O)=C1 BXKDSDJJOVIHMX-UHFFFAOYSA-N 0.000 description 2
- 125000003700 epoxy group Chemical group 0.000 description 2
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 2
- 230000001747 exhibiting effect Effects 0.000 description 2
- 229910052733 gallium Inorganic materials 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 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
- 238000005304 joining Methods 0.000 description 2
- 150000003951 lactams Chemical class 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 150000007517 lewis acids Chemical class 0.000 description 2
- 229910001507 metal halide Inorganic materials 0.000 description 2
- 150000005309 metal halides Chemical class 0.000 description 2
- 125000004108 n-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 2
- 125000001280 n-hexyl group Chemical group C(CCCCC)* 0.000 description 2
- 125000000740 n-pentyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 2
- 125000004123 n-propyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])* 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 2
- 229920002647 polyamide Polymers 0.000 description 2
- 125000003367 polycyclic group Chemical group 0.000 description 2
- 150000004291 polyenes Chemical class 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 229920006267 polyester film Polymers 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 229920006254 polymer film Polymers 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- YRHRIQCWCFGUEQ-UHFFFAOYSA-N thioxanthen-9-one Chemical class C1=CC=C2C(=O)C3=CC=CC=C3SC2=C1 YRHRIQCWCFGUEQ-UHFFFAOYSA-N 0.000 description 2
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 2
- SKYXLDSRLNRAPS-UHFFFAOYSA-N 1,2,4-trifluoro-5-methoxybenzene Chemical compound COC1=CC(F)=C(F)C=C1F SKYXLDSRLNRAPS-UHFFFAOYSA-N 0.000 description 1
- CYIGRWUIQAVBFG-UHFFFAOYSA-N 1,2-bis(2-ethenoxyethoxy)ethane Chemical compound C=COCCOCCOCCOC=C CYIGRWUIQAVBFG-UHFFFAOYSA-N 0.000 description 1
- MSAHTMIQULFMRG-UHFFFAOYSA-N 1,2-diphenyl-2-propan-2-yloxyethanone Chemical compound C=1C=CC=CC=1C(OC(C)C)C(=O)C1=CC=CC=C1 MSAHTMIQULFMRG-UHFFFAOYSA-N 0.000 description 1
- ALVZNPYWJMLXKV-UHFFFAOYSA-N 1,9-Nonanediol Chemical compound OCCCCCCCCCO ALVZNPYWJMLXKV-UHFFFAOYSA-N 0.000 description 1
- CTOHEPRICOKHIV-UHFFFAOYSA-N 1-dodecylthioxanthen-9-one Chemical compound S1C2=CC=CC=C2C(=O)C2=C1C=CC=C2CCCCCCCCCCCC CTOHEPRICOKHIV-UHFFFAOYSA-N 0.000 description 1
- HWCLMKDWXUGDKL-UHFFFAOYSA-N 1-ethenoxy-2-ethoxyethane Chemical compound CCOCCOC=C HWCLMKDWXUGDKL-UHFFFAOYSA-N 0.000 description 1
- GXZPMXGRNUXGHN-UHFFFAOYSA-N 1-ethenoxy-2-methoxyethane Chemical compound COCCOC=C GXZPMXGRNUXGHN-UHFFFAOYSA-N 0.000 description 1
- UBPXWZDJZFZKGH-UHFFFAOYSA-N 1-ethenyl-3-methylpyrrolidin-2-one Chemical compound CC1CCN(C=C)C1=O UBPXWZDJZFZKGH-UHFFFAOYSA-N 0.000 description 1
- 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
- DCRYNQTXGUTACA-UHFFFAOYSA-N 1-ethenylpiperazine Chemical compound C=CN1CCNCC1 DCRYNQTXGUTACA-UHFFFAOYSA-N 0.000 description 1
- PBGPBHYPCGDFEZ-UHFFFAOYSA-N 1-ethenylpiperidin-2-one Chemical compound C=CN1CCCCC1=O PBGPBHYPCGDFEZ-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
- IFSLSXUHNIVHPB-UHFFFAOYSA-N 2,2-dimethylpropane-1,3-diol;3-hydroxy-2,2-dimethylpropanoic acid;prop-2-enoic acid Chemical compound OC(=O)C=C.OCC(C)(C)CO.OCC(C)(C)C(O)=O IFSLSXUHNIVHPB-UHFFFAOYSA-N 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
- 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 1
- ZUAURMBNZUCEAF-UHFFFAOYSA-N 2-(2-phenoxyethoxy)ethanol Chemical compound OCCOCCOC1=CC=CC=C1 ZUAURMBNZUCEAF-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
- 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 1
- DZZAHLOABNWIFA-UHFFFAOYSA-N 2-butoxy-1,2-diphenylethanone Chemical compound C=1C=CC=CC=1C(OCCCC)C(=O)C1=CC=CC=C1 DZZAHLOABNWIFA-UHFFFAOYSA-N 0.000 description 1
- ZCDADJXRUCOCJE-UHFFFAOYSA-N 2-chlorothioxanthen-9-one Chemical compound C1=CC=C2C(=O)C3=CC(Cl)=CC=C3SC2=C1 ZCDADJXRUCOCJE-UHFFFAOYSA-N 0.000 description 1
- VUIWJRYTWUGOOF-UHFFFAOYSA-N 2-ethenoxyethanol Chemical compound OCCOC=C VUIWJRYTWUGOOF-UHFFFAOYSA-N 0.000 description 1
- PGMMQIGGQSIEGH-UHFFFAOYSA-N 2-ethenyl-1,3-oxazole Chemical compound C=CC1=NC=CO1 PGMMQIGGQSIEGH-UHFFFAOYSA-N 0.000 description 1
- MZNSQRLUUXWLSB-UHFFFAOYSA-N 2-ethenyl-1h-pyrrole Chemical compound C=CC1=CC=CN1 MZNSQRLUUXWLSB-UHFFFAOYSA-N 0.000 description 1
- ZDHWTWWXCXEGIC-UHFFFAOYSA-N 2-ethenylpyrimidine Chemical compound C=CC1=NC=CC=N1 ZDHWTWWXCXEGIC-UHFFFAOYSA-N 0.000 description 1
- KMNCBSZOIQAUFX-UHFFFAOYSA-N 2-ethoxy-1,2-diphenylethanone Chemical compound C=1C=CC=CC=1C(OCC)C(=O)C1=CC=CC=C1 KMNCBSZOIQAUFX-UHFFFAOYSA-N 0.000 description 1
- 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
- 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 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
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- GAWIXWVDTYZWAW-UHFFFAOYSA-N C[CH]O Chemical group C[CH]O GAWIXWVDTYZWAW-UHFFFAOYSA-N 0.000 description 1
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 description 1
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- 229920000106 Liquid crystal polymer Polymers 0.000 description 1
- BWPYBAJTDILQPY-UHFFFAOYSA-N Methoxyphenone Chemical compound C1=C(C)C(OC)=CC=C1C(=O)C1=CC=CC(C)=C1 BWPYBAJTDILQPY-UHFFFAOYSA-N 0.000 description 1
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- MOOIXEMFUKBQLJ-UHFFFAOYSA-N [1-(ethenoxymethyl)cyclohexyl]methanol Chemical compound C=COCC1(CO)CCCCC1 MOOIXEMFUKBQLJ-UHFFFAOYSA-N 0.000 description 1
- GUCYFKSBFREPBC-UHFFFAOYSA-N [phenyl-(2,4,6-trimethylbenzoyl)phosphoryl]-(2,4,6-trimethylphenyl)methanone Chemical compound CC1=CC(C)=CC(C)=C1C(=O)P(=O)(C=1C=CC=CC=1)C(=O)C1=C(C)C=C(C)C=C1C GUCYFKSBFREPBC-UHFFFAOYSA-N 0.000 description 1
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- 125000001931 aliphatic group Chemical group 0.000 description 1
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- BBEAQIROQSPTKN-UHFFFAOYSA-N antipyrene Natural products C1=CC=C2C=CC3=CC=CC4=CC=C1C2=C43 BBEAQIROQSPTKN-UHFFFAOYSA-N 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- WURBFLDFSFBTLW-UHFFFAOYSA-N benzil Chemical group C=1C=CC=CC=1C(=O)C(=O)C1=CC=CC=C1 WURBFLDFSFBTLW-UHFFFAOYSA-N 0.000 description 1
- RWCCWEUUXYIKHB-UHFFFAOYSA-N benzophenone Chemical compound C=1C=CC=CC=1C(=O)C1=CC=CC=C1 RWCCWEUUXYIKHB-UHFFFAOYSA-N 0.000 description 1
- 150000008366 benzophenones Chemical class 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 150000001728 carbonyl compounds Chemical class 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000003851 corona treatment Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- LDHQCZJRKDOVOX-NSCUHMNNSA-N crotonic acid Chemical compound C\C=C\C(O)=O LDHQCZJRKDOVOX-NSCUHMNNSA-N 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 150000008049 diazo compounds Chemical class 0.000 description 1
- 238000007607 die coating method Methods 0.000 description 1
- FULIVAOPQQVMDQ-UHFFFAOYSA-N dimethoxymethane;propane Chemical compound CCC.COCOC FULIVAOPQQVMDQ-UHFFFAOYSA-N 0.000 description 1
- 239000004205 dimethyl polysiloxane Substances 0.000 description 1
- 125000002147 dimethylamino group Chemical group [H]C([H])([H])N(*)C([H])([H])[H] 0.000 description 1
- 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 1
- 239000000975 dye Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- LYCAIKOWRPUZTN-UHFFFAOYSA-N ethylene glycol Natural products OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 1
- GVEPBJHOBDJJJI-UHFFFAOYSA-N fluoranthrene Natural products C1=CC(C2=CC=CC=C22)=C3C2=CC=CC3=C1 GVEPBJHOBDJJJI-UHFFFAOYSA-N 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 239000001530 fumaric acid Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000007756 gravure coating Methods 0.000 description 1
- 150000002366 halogen compounds Chemical class 0.000 description 1
- XXMIOPMDWAUFGU-UHFFFAOYSA-N hexane-1,6-diol Chemical compound OCCCCCCO XXMIOPMDWAUFGU-UHFFFAOYSA-N 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 125000004029 hydroxymethyl group Chemical group [H]OC([H])([H])* 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 125000005641 methacryl group Chemical group 0.000 description 1
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 description 1
- UUORTJUPDJJXST-UHFFFAOYSA-N n-(2-hydroxyethyl)prop-2-enamide Chemical compound OCCNC(=O)C=C UUORTJUPDJJXST-UHFFFAOYSA-N 0.000 description 1
- SLCVBVWXLSEKPL-UHFFFAOYSA-N neopentyl glycol Chemical compound OCC(C)(C)CO SLCVBVWXLSEKPL-UHFFFAOYSA-N 0.000 description 1
- 229920003986 novolac Polymers 0.000 description 1
- OTLDLKLSNZMTTA-UHFFFAOYSA-N octahydro-1h-4,7-methanoindene-1,5-diyldimethanol Chemical compound C1C2C3C(CO)CCC3C1C(CO)C2 OTLDLKLSNZMTTA-UHFFFAOYSA-N 0.000 description 1
- 150000002898 organic sulfur compounds Chemical class 0.000 description 1
- 125000001037 p-tolyl group Chemical group [H]C1=C([H])C(=C([H])C([H])=C1*)C([H])([H])[H] 0.000 description 1
- 125000000913 palmityl group Chemical group [H]C([*])([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])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 1
- 125000003538 pentan-3-yl group Chemical group [H]C([H])([H])C([H])([H])C([H])(*)C([H])([H])C([H])([H])[H] 0.000 description 1
- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 description 1
- 125000000951 phenoxy group Chemical group [H]C1=C([H])C([H])=C(O*)C([H])=C1[H] 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 230000002165 photosensitisation Effects 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 238000009832 plasma treatment Methods 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 description 1
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 description 1
- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 239000011112 polyethylene naphthalate Substances 0.000 description 1
- 229920006290 polyethylene naphthalate film Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 125000002914 sec-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 229920006012 semi-aromatic polyamide Polymers 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 125000001973 tert-pentyl group Chemical group [H]C([H])([H])C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- UWHCKJMYHZGTIT-UHFFFAOYSA-N tetraethylene glycol Chemical compound OCCOCCOCCOCCO UWHCKJMYHZGTIT-UHFFFAOYSA-N 0.000 description 1
- LDHQCZJRKDOVOX-UHFFFAOYSA-N trans-crotonic acid Natural products CC=CC(O)=O LDHQCZJRKDOVOX-UHFFFAOYSA-N 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 1
- 229960000834 vinyl ether Drugs 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
- PAPBSGBWRJIAAV-UHFFFAOYSA-N ε-Caprolactone Chemical compound O=C1CCCCCO1 PAPBSGBWRJIAAV-UHFFFAOYSA-N 0.000 description 1
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
- B32B7/022—Mechanical 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
- B32B7/02—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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/42—Polarizing, birefringent, filtering
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Laminated Bodies (AREA)
- Polarising Elements (AREA)
Abstract
The laminated optical film (X) of the present invention comprises, in the thickness direction (H), an optical film (10), an adhesive layer (31), and an optical film (21) in that order, wherein the adhesive layer (31) is bonded to the optical film (10) and to the optical film (21), and the ratio of the 90 DEG peel strength F1 (N/15 mm) of the optical film (21) and the optical film (10) at 25 ℃ to the press-in elastic modulus M1 (GPa) of the adhesive layer (31) at 25 ℃ is 8 or more.
Description
Technical Field
The present invention relates to a laminated optical film.
Background
The display panel has a laminated structure including a pixel panel, a touch panel, a surface protection cover, and the like, for example. Various functional optical films having a given optical function are also included in the laminated structure of the display panel. Examples of the functional optical film include a polarizer film and a retardation film. The functional optical film is introduced into the laminated structure in a state of being bonded to other optical films such as a protective film via an adhesive, that is, in a state of being laminated with the optical films. Such a laminated optical film is described in, for example, patent document 1 below.
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open No. 2019-147865
Disclosure of Invention
Problems to be solved by the invention
With the thinning of display panels, the thinning of functional optical films has been advanced. The adhesive layer between the optical films in the laminated optical film is also required to be thin. However, the thinner the adhesive layer between the optical films, the more easily the bonding force between the optical films decreases.
On the other hand, in smart phone applications and tablet terminal applications, for example, development of display panels that can be repeatedly folded (foldable) has been advanced. In a foldable display panel, each element in the laminated structure is made to be bendable repeatedly. However, conventionally, peeling is likely to occur between the optical films of the laminated optical films at the bending portion of the foldable display panel. When the foldable display panel is repeatedly folded over a long period of time and used, in particular, when the adhesive layer is insufficient in stress relaxation property, the stress generated in the laminated optical films cannot be relaxed, and peeling is likely to occur between the optical films of the laminated optical films. This is because when the display panel is bent, stress such as shear stress locally acts on the adhesive layer at the bending portion. The occurrence of such peeling is not preferable because it causes malfunction of the device.
The present invention provides a laminated optical film which is suitable for suppressing peeling at the time of bending even when an adhesive layer is thin between optical films bonded via the adhesive layer.
Means for solving the problems
The invention [1] comprises a laminated optical film comprising, in order in the thickness direction, a 1 st optical film, an adhesive layer, and a 2 nd optical film,
the adhesive layer is bonded to the 1 st optical film and is bonded to the 2 nd optical film, and the ratio of the 90 DEG peel strength F1 of the 2 nd optical film to the 1 st optical film at 25 ℃ to the press-in elastic modulus M1 (GPa) at 25 ℃ of the adhesive layer is 8 or more.
The invention [2] includes the laminated optical film of [1] above, wherein the 90℃peel strength F1 is 0.8N/15mm or more.
The invention [3] includes the laminated optical film described in the above [1] or [2], wherein the press-in elastic modulus M1 is 0.2GPa or less.
The invention [4] includes the laminated optical film according to any one of [1] to [3], wherein the adhesive layer has a thickness of 5 μm or less.
The invention [5] includes the laminated optical film according to any one of the above [1] to [4], wherein the 1 st optical film is a polarizer film.
ADVANTAGEOUS EFFECTS OF INVENTION
In the laminated optical film of the present invention, as described above, the ratio of the 90 ° peel strength F1 at 25 ℃ of the 2 nd optical film to the 1 st optical film to the press-in elastic modulus M1 (GPa) at 25 ℃ of the adhesive layer is 8 or more. Such a configuration is suitable for achieving a balance between the compressive stress relaxation property and elastic recovery property of the 2 nd optical film side in the adhesive layer joining the 1 st/2 nd optical films, thereby ensuring good adhesion. Therefore, the laminated optical film is suitable for suppressing peeling between optical films when bending the optical film with the 2 nd optical film side being the inner side even when the adhesive layer is thin.
Drawings
Fig. 1 is a schematic cross-sectional view of one embodiment of a laminated optical film of the present invention.
Fig. 2 shows a state in which the laminated optical film shown in fig. 1 is folded.
Symbol description
X-layer laminated optical film
10 optical film (1 st optical film)
21 optical film (2 nd optical film)
22 optical film (3 rd optical film)
31 adhesive layer (adhesive layer 1)
32 adhesive layer (adhesive layer 2)
H thickness direction
Detailed Description
As shown in fig. 1, a laminated optical film X as an embodiment of the laminated optical film of the present invention includes an optical film 10 (1 st optical film), an optical film 21 (2 nd optical film), an optical film 22 (3 rd optical film), an adhesive layer 31 (1 st adhesive layer), and an adhesive layer 32 (2 nd adhesive layer). The laminated optical film X has a sheet shape of a given thickness, and is spread in a direction (plane direction) orthogonal to the thickness direction H. Specifically, the laminated optical film X includes, in order in the thickness direction H, an optical film 21, an adhesive layer 31, an optical film 10, an adhesive layer 32, and an optical film 22. The adhesive layer 31 bonds the optical films 10, 21 together between them. The adhesive layer 32 bonds the optical films 10, 22 together between them. The laminated optical film X is a composite film introduced into the laminated structure of the foldable display panel. As shown in fig. 2, in the foldable display panel, the laminated optical film X is folded so that the optical film 21 and the adhesive layer 31 are positioned inward. At the bending portion B, the optical film 21 and the adhesive layer 31 are positioned on the inside of the bend (lower side in the drawing) with respect to the optical film 10, and the optical film 22 and the adhesive layer 32 are positioned on the outside of the bend (upper side in the drawing) with respect to the optical film 10.
In the present embodiment, the optical film 10 is a functional optical film. Examples of the functional optical film include a polarizer film and a retardation film.
Examples of the polarizer film include hydrophilic polymer films subjected to dyeing treatment with a dichroic substance and subsequent stretching treatment. Examples of the dichroic substance include iodine and dichroic dyes. Examples of the hydrophilic polymer film include: polyvinyl alcohol (PVA) films, partially methylated PVA films, and partially saponified films of ethylene-vinyl acetate copolymers. As the polarizer film, a polyene alignment film can be also mentioned. Examples of the material of the polyene oriented film include: a dehydrated product of PVA, and a desalted product of polyvinyl chloride. As the polarizer film, a PVA film subjected to a dyeing treatment with iodine and a subsequent unidirectional stretching treatment is preferable in view of excellent optical characteristics such as polarization characteristics.
From the viewpoint of thickness reduction, the thickness of the optical film 10 as a polarizer film is preferably 15 μm or less, more preferably 12 μm or less, further preferably 10 μm or less, particularly preferably 8 μm or less. The thin polarizer film is excellent in visibility because of small thickness unevenness, and is excellent in durability against thermal shock because of small dimensional change due to temperature change. From the viewpoint of strength, the thickness of the optical film 10 as a polarizer film is preferably 3 μm or more, more preferably 5 μm or more.
Examples of the retardation film include: lambda/2 wavelength film, lambda/4 wavelength film, and viewing angle compensation film. Examples of the material of the retardation film include a polymer film which is birefringent by stretching. Examples of the polymer film include a cellulose film and a polyester film. Examples of the cellulose film include cellulose triacetate film. Examples of the polyester film include polyethylene terephthalate film and polyethylene naphthalate film. The thickness of the optical film 10 as the retardation film is, for example, 20 μm or more and, for example, 150 μm or less. As the retardation film, a film having a substrate such as a cellulose film and an alignment layer of a liquid crystal compound such as a liquid crystalline polymer on the substrate can be preferably used.
The optical films 21 and 22 are transparent protective films, respectively. The transparent protective film is, for example, a transparent resin film having flexibility. Examples of the material of the transparent protective film include: polyolefins, polyesters, polyamides, polyimides, polyvinylchlorides, polyvinylidene chlorides, celluloses, modified celluloses, polystyrenes, and polycarbonates. Examples of the polyolefin include: cycloolefin polymers (COPs), polyethylene, polypropylene, ethylene-propylene copolymers, ethylene-vinyl acetate copolymers, and ethylene-vinyl alcohol copolymers. Examples of the polyester include: polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate. Examples of the polyamide include: polyamide 6, and partially aromatic polyamide. Examples of the modified cellulose include cellulose triacetate. These materials may be used alone or in combination of two or more. As a material of the transparent protective film, polyolefin is preferably used, and COP is more preferably used from the viewpoint of cleanliness. The material of the optical film 21 may be the same as or different from the material of the optical film 22.
From the viewpoint of the strength of the laminated optical film X, the thickness of each of the optical films 21, 22 is preferably 5 μm or more, more preferably 10 μm or more, and still more preferably 20 μm or more. From the viewpoint of thinning the laminated optical film X, the thickness of the optical film 21 is preferably 100 μm or less, more preferably 70 μm or less, and still more preferably 50 μm or less. The thickness of the optical film 21 may be the same as or different from the thickness of the optical film 22.
The adhesive layer 31 is a cured product of the 1 st adhesive composition. The adhesive layer 31 is directly bonded to the optical film 10 and is directly bonded to the optical film 21. The 1 st adhesive composition contains a curable resin, and the components of the 1 st adhesive composition are specifically described below.
From the viewpoint of the bonding force between the optical films 10 and 21, the thickness T1 of the adhesive layer 31 is preferably 0.1 μm or more, more preferably 0.4 μm or more, still more preferably 0.7 μm or more, and particularly preferably 0.8 μm or more. From the viewpoint of thinning the laminated optical film X, the thickness T1 of the adhesive layer 31 is preferably 5 μm or less, more preferably 3 μm or less, further preferably 1.5 μm or less, particularly preferably 1 μm or less.
The 1 st indentation elastic modulus (indentation elastic modulus M1) of the adhesive layer 31 at 25 ℃ measured by the nanoindentation method is preferably 0.01GPa or more, more preferably 0.03GPa or more, still more preferably 0.05GPa or more, and particularly preferably 0.07GPa or more (the 1 st indentation elastic modulus is the indentation elastic modulus under the 1 st measurement condition, which is described in examples below, and in the 1 st measurement condition, the maximum indentation depth of the indenter against the measurement sample during the load application is 200 nm). Such a configuration is preferable for suppressing the cracking of the adhesive layer 31 at the time of bending. The press-in elastic modulus M1 is preferably 0.2GPa or less, more preferably 0.15GPa or less, still more preferably 0.13GPa or less, particularly preferably 0.12GPa or less. Such a configuration is preferable for relaxing compressive stress acting on the adhesive layer 31 at the bent portion B when the laminated optical film X is bent so that the optical film 21 side is inside. The relaxation of the compressive stress of the adhesive layer 31 at the bent portion B helps to suppress peeling between the optical films 10, 21. As a method for adjusting the press-fit elastic modulus of the adhesive layer 31, for example, a method for adjusting the composition of the 1 st adhesive composition is mentioned. Specifically, as a method for adjusting the press-in elastic modulus of the adhesive layer 31, the adjustment of the number of functional groups of the polymerizable compound described later in the 1 st adhesive composition, that is, the adjustment of the acrylic equivalent and the epoxy equivalent of the polymerizable compound is effective.
Nanoindentation is a technique for measuring various physical properties of a sample on a nanometer scale. In the present embodiment, the nanoindentation method is performed based on ISO 14577. In the nanoindentation method, a process of pressing a indenter into a sample placed on a stage (load application process) and a process of thereafter pulling out the indenter from the sample (load release process) are performed, and in a series of processes, a load acting between the indenter and the sample and a relative displacement of the indenter with respect to the sample are measured (load-displacement measurement), whereby a load-displacement curve can be obtained. From this load-displacement curve, various physical properties can be obtained on the basis of nanoscale measurement on the measurement sample. The load-displacement measurement of the cross section of the adhesive layer by nanoindentation may be performed using, for example, a nanoindenter (trade name "Triboindinder", manufactured by Hysicron corporation), and is described in the following examples.
The 2 nd indentation elastic modulus (indentation elastic modulus M2) of the adhesive layer 31 at 25 ℃ measured by nanoindentation is preferably 0.5GPa or more, more preferably 1GPa or more, still more preferably 1.5GPa or more, and particularly preferably 2GPa or more (the 2 nd indentation elastic modulus is the indentation elastic modulus under the 2 nd measurement condition, and the maximum indentation depth of the indenter during load application to the measurement sample is 50nm in the 2 nd measurement condition, as described in the following examples). Such a configuration is preferable for suppressing the cracking of the adhesive layer 31 at the time of bending. The press-in elastic modulus M2 is preferably 8.2GPa or less, more preferably 7GPa or less, still more preferably 6GPa or less, particularly preferably 5.2GPa or less. Such a configuration is preferable for relaxing compressive stress acting on the adhesive layer 31 at the bent portion B when the laminated optical film X is bent so that the optical film 21 side is inside.
In the laminated optical film X, the 90 DEG peel strength F1 of the optical film 21 and the optical film 10 at 25℃is preferably 0.8N/15mm or more, more preferably 1N/15mm or more, still more preferably 1.2N/15mm or more, particularly preferably 1.5N/15mm or more. Such a configuration is preferable for ensuring a good bonding force between the optical films 10 and 21, and particularly preferable for ensuring a bonding force between the optical films 10 and 21 at the bending portion B when the laminated optical film X is bent so that the optical film 21 side is the inner side. The 90 DEG peel strength F1 is, for example, 10N/15mm or less. The 90 ° peel strength F1 can be measured by the method described in examples below. The peel strength of the optical film 21 and the optical film 10 is a force required to peel the optical film 21 from the optical film 10, and the peeling includes interfacial peeling between the optical film 10 and the adhesive layer 31, peeling caused by cohesive failure of the adhesive layer 31, interfacial peeling between the adhesive layer 31 and the optical film 21, and peeling based on a combination thereof. Further, as a method for adjusting the 90 ° peel strength F1, for example, a method for adjusting the composition of the 1 st adhesive composition is mentioned. The method for adjusting the 90 ° peel strength F1 specifically includes adjustment of the number of functional groups of the polymerizable compound described later in the 1 st adhesive composition, that is, adjustment of the acrylic equivalent and the epoxy equivalent of the polymerizable compound.
The ratio (F1/M1) of the 90 DEG peel strength F1 (N/15 mm) to the press-in elastic modulus M1 (GPa) is 8 or more. Such a configuration is suitable for balancing the compressive stress relaxation property and elastic recovery property of the optical film 21 side in the adhesive layer 31 joining the optical films 10 and 21. Therefore, the laminated optical film X is suitable for suppressing peeling between the optical films 10 and 21 at the bending portion B in the case where the optical film 21 is bent so as to be inward even when the adhesive layer 31 is thin. Particularly as shown in the examples described below. The ratio (F1/M1) is preferably 8.5 or more, more preferably 9 or more, still more preferably 10 or more, particularly preferably 12 or more. Such a configuration is preferable for relaxing compressive stress acting on the adhesive layer 31 at the bent portion B when the laminated optical film X is bent so that the optical film 21 side is inside. The relaxation of the compressive stress of the adhesive layer 31 at the bent portion B helps to suppress peeling between the optical films 10, 21. The ratio (F1/M1) is, for example, 30 or less, preferably 25 or less. Such a configuration is preferable for securing elastic recovery of the adhesive layer 31. The securing of the elastic recovery of the adhesive layer 31 helps to suppress stress concentration at the bent portion B and to suppress peeling between the optical films 10, 21.
The ratio (F1/M2) of the 90 DEG peel strength F1 (N/15 mm) to the press-in elastic modulus M2 (GPa) is preferably 0.2 or more, more preferably 0.3 or more, and still more preferably 0.4 or more. Such a configuration is preferable for relaxing compressive stress acting on the adhesive layer 31 at the bent portion B when the laminated optical film X is bent so that the optical film 21 side is inside. The ratio (F1/M2) is preferably 5 or less, more preferably 3 or less, and further preferably 2 or less. Such a configuration is preferable for securing elastic recovery of the adhesive layer 31.
The higher the press-in elastic moduli M1 and M2 of the adhesive layer 31, the greater the peel force (applied to the center direction of the radius of curvature of the bend) applied to the bending portion of the adhesive layer 31 tends to be when the laminated optical film X is bent so that the optical film 21 side is inside. The ratio (F1/M1) represents a balance between the degree of the press-in elastic modulus M1 of the adhesive layer 31 and the magnitude of the 90 ° peel strength F1. The configuration in which the ratio (F1/M1) is 8 or more is suitable for suppressing peeling between the optical films 10 and 21 against the peeling force acting on the adhesive layer 31 at the bending portion B at the time of the above-described bending of the laminated optical film X. Examples of the method for adjusting the ratio (F1/M1) include adjustment of the press-in elastic modulus M1 and adjustment of the 90 DEG peel strength F1.
The adhesive layer 32 is a cured product of the 2 nd adhesive composition. The adhesive layer 32 is directly bonded to the optical film 10 and to the optical film 22. The 2 nd adhesive composition contains a curable resin, and the components of the 2 nd adhesive composition are specifically described below.
From the viewpoint of the bonding force between the optical films 10 and 22, the thickness T2 of the adhesive layer 32 is preferably 0.1 μm or more, more preferably 0.4 μm or more, still more preferably 0.7 μm or more, and particularly preferably 0.8 μm or more. From the viewpoint of thinning the laminated optical film X, the thickness T2 of the adhesive layer 32 is preferably 5 μm or less, more preferably 3 μm or less, further preferably 1.5 μm or less, particularly preferably 1 μm or less. The thickness T2 of the adhesive layer 32 may be the same as or different from the thickness T1 of the adhesive layer 31. The ratio (T2/T1) of the thickness T2 to the thickness T1 is, for example, 0.02 or more, preferably 0.1 or more, and is, for example, 50 or less, preferably 7.5 or less.
In the laminated optical film X, the 180 DEG peel strength F2 of the optical film 22 and the optical film 10 at 25℃is preferably 1.0N/15mm or more, more preferably 1.5N/15mm or more, and still more preferably 2.0N/15mm or more. Such a configuration is preferable for securing a good bonding force between the optical films 10 and 22, and particularly preferable for securing a bonding force between the optical films 10 and 22 at the bending portion B in the case where the laminated optical film X is bent so that the optical film 21 side is the inner side (the case shown in fig. 2). The 180 DEG peel strength F2 is, for example, 5.0N/15mm or less. The 180 ° peel strength F2 can be measured in the same manner as the peel strength measurement method described in the examples below, except that the peel angle is 180 ° instead of 90 °. Further, as a method for adjusting 180 ° peel strength F2, for example, a method for adjusting the composition of the 2 nd adhesive composition is mentioned. Specifically, the method for adjusting 180 ° peel strength F2 includes adjustment of the number of functional groups of the polymerizable compound described later in the 2 nd adhesive composition, that is, adjustment of acrylic equivalent and epoxy equivalent of the polymerizable compound.
The ratio (F1/F2) of the 90 DEG peel strength F1 (N/15 mm) to the 180 DEG peel strength F2 (N/15 mm) is preferably 1.0 or more, more preferably 1.2 or more, still more preferably 1.5 or more. The ratio (F1/F2) is preferably 4.0 or less, more preferably 2.5 or less, and further preferably 2.0 or less. These configurations are preferable for both the suppression of peeling between the optical films 10 and 21 and the suppression of peeling between the optical films 10 and 22 when the laminated optical film X is folded with the optical film 22 side being the inner side. Examples of the method for adjusting the ratio (F1/F2) include adjustment of the 90℃peel strength F1 and adjustment of the 180℃peel strength F2.
The adhesive layer 31 is, for example, a cured product of the 1 st adhesive composition (1 st active energy ray-curable composition) containing an active energy ray-curable resin. Examples of the 1 st active energy ray-curable composition include: electron beam curable composition, ultraviolet curable composition, and visible light curable composition. In the present embodiment, the 1 st active energy ray-curable composition is either one or both of a radical-polymerizable composition and a cationic-polymerizable composition.
The radical polymerizable composition contains a radical polymerizable compound as a monomer. The radical polymerizable compound is a compound having a radical polymerizable functional group. Examples of the radical polymerizable functional group include a group containing an ethylenically unsaturated bond. Examples of the group containing an ethylenic unsaturated bond include: (meth) acryl, vinyl and allyl. (meth) acryl means acryl and/or methacryl. From the viewpoint of curability of the 1 st active energy ray-curable composition, the 1 st active energy ray-curable composition preferably contains a radical-polymerizable compound having a (meth) acryloyl group as a main component, and the main component is the component having the largest content in mass ratio. The proportion of the (meth) acryloyl group-containing radical polymerizable compound in the 1 st active energy ray-curable composition is, for example, 50 mass% or more, preferably 70 mass% or more, and more preferably 80 mass% or more. Examples of the radical polymerizable compound include monofunctional radical polymerizable compounds and difunctional or more polyfunctional radical polymerizable compounds.
Examples of the monofunctional radical polymerizable compound include (meth) acrylamide derivatives having a (meth) acrylamide group. As the (meth) acrylamide derivative, there may be mentioned: n-alkyl (meth) acrylamide-containing derivatives, N-hydroxyalkyl (meth) acrylamide-containing derivatives, N-aminoalkyl (meth) acrylamide-containing derivatives, N-alkoxy (meth) acrylamide-containing derivatives, and N-mercaptoalkyl (meth) acrylamide-containing derivatives. Examples of the N-alkyl (meth) acrylamide derivatives include: n-methyl (meth) acrylamide, N-dimethyl (meth) acrylamide, N-diethyl (meth) acrylamide, N-isopropyl (meth) acrylamide, N-butyl (meth) acrylamide, and N-hexyl (meth) acrylamide are preferably used. Examples of the N-hydroxyalkyl (meth) acrylamide-containing derivatives include: n-methylol (meth) acrylamide, N-hydroxyethyl (meth) acrylamide, and N-methylol-N-propyl (meth) acrylamide are preferably used. The (meth) acrylamide derivative may be used alone or in combination of two or more.
Examples of the monofunctional radical polymerizable compound include (meth) acrylic acid derivatives having a (meth) acryloyloxy group. Examples of the (meth) acrylic acid derivative include: alkyl (meth) acrylates, and (meth) acrylic acid derivatives other than alkyl (meth) acrylates. The (meth) acrylic acid derivatives may be used alone or in combination of two or more.
Examples of the alkyl (meth) acrylate include: methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, n-pentyl (meth) acrylate, 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 the (meth) acrylic acid derivative other than the alkyl (meth) acrylate include: cycloalkyl (meth) acrylate, aralkyl (meth) acrylate, hydroxy-containing (meth) acrylic acid derivatives, alkoxy-containing (meth) acrylic acid derivatives, and phenoxy-containing (meth) acrylic acid derivatives. Examples of the cycloalkyl (meth) acrylate include: cyclohexyl (meth) acrylate, and cyclopentyl (meth) acrylate. Examples of the aralkyl (meth) acrylate include: benzyl (meth) acrylate, and 3-phenoxybenzyl (meth) acrylate. Examples of the hydroxyl group-containing (meth) acrylic acid derivative include: 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 4- (hydroxymethyl) cyclohexyl ] methyl acrylate, and 2-hydroxy-3-phenoxypropyl (meth) acrylate. Examples of the alkoxy group-containing (meth) acrylic acid derivative include: 2-methoxyethyl (meth) acrylate, 2-ethoxyethyl (meth) acrylate, and 3-methoxybutyl (meth) acrylate. Examples of the phenoxy (meth) acrylic acid-containing derivative include: phenoxyethyl (meth) acrylate, and phenoxydiethylene glycol (meth) acrylate. As the (meth) acrylic acid derivative other than the alkyl (meth) acrylate, at least one selected from the group consisting of 3-phenoxybenzyl acrylate, 2-hydroxy-3-phenoxypropyl acrylate, and phenoxydiethylene glycol acrylate is preferably used.
The monofunctional radical polymerizable compound may be a carboxyl group-containing monomer. Examples of the carboxyl group-containing monomer include: (meth) acrylic acid, carboxyethyl acrylate, carboxypentyl acrylate, itaconic acid, maleic acid, fumaric acid, crotonic acid, and methacrylic acid.
The monofunctional radical polymerizable compound may be a lactam-based vinyl monomer. Examples of the lactam-based vinyl monomer include: n-vinyl-2-pyrrolidone, N-vinyl-epsilon-caprolactam, and methyl vinyl pyrrolidone.
Examples of the monofunctional radical polymerizable compound include vinyl monomers having nitrogen-containing heterocycles. Examples of the monomer include: vinyl pyridine, vinyl piperidone, vinyl pyrimidine, vinyl piperazine, vinyl pyrazine, vinyl pyrrole, vinyl imidazole, vinylOxazole, acryloylmorpholine, and vinylmorpholine.
Examples of the polyfunctional radical polymerizable compound include tripropylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, 1, 6-hexanediol di (meth) acrylate, 1, 9-nonanediol di (meth) acrylate, 1, 10-decanediol diacrylate, 2-ethyl-2-butylpropanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, tricyclodecanedimethanol di (meth) acrylate, cyclotrimethylol propane methylal (meth) acrylate, and di Alkylene glycol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, and hydroxypivalic acid neopentyl glycol acrylate adduct. As the polyfunctional radical polymerizable compound, at least one selected from tripropylene glycol diacrylate, 1, 9-nonanediol diacrylate, and hydroxypivalic acid neopentyl glycol acrylate adduct may be preferably used. The polyfunctional radical polymerizable compound may be used alone or in combination of two or more. The multifunctional radically polymerizable compound functions as a crosslinking agent.
When the 1 st active energy ray-curable composition is an ultraviolet-curable composition or a visible light-curable composition, the 1 st active energy ray-curable composition contains a photopolymerization initiator. Examples of the photopolymerization initiator include: benzophenone compounds, benzoin ether compounds, and thioxanthone compounds. Examples of the benzophenone compound include: dibenzoyl, benzophenone, benzoyl benzoic acid, and 3,3' -dimethyl-4-methoxybenzophenone. Examples of the benzoin ether compound include: benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, and benzoin butyl ether. Examples of the thioxanthone compound include: thioxanthone, 2-chlorothioxanthone, 2-methylthioxanthone, 2, 4-dimethylthioxanthone, isopropylthioxanthone, 2, 4-dichlorothioxanthone, 2, 4-diethylthioxanthone, 2, 4-diisopropylthioxanthone, and dodecylthioxanthone.
When the 1 st active energy ray-curable composition is a visible light-curable composition, a photopolymerization initiator having high sensitivity to light of 380nm or more is preferably used. Examples of such photopolymerization initiators include: 2-methyl-1- (4-methylsulfanylphenyl) -2-morpholinopropan-1-one, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butanone-1, 2- (dimethylamino) -2- [ (4-methylphenyl) methyl ] -1- [4- (4-morpholino) phenyl ] -1-butanone, 2,4, 6-trimethylbenzoyl diphenyl phosphine oxide, bis (2, 4, 6-trimethylbenzoyl) phenylphosphine oxide, bis (. Eta.5-2, 4-cyclopenta-1-yl) bis (2, 6-difluoro-3- (1H-pyrrol-1-yl) phenyl) titanium.
As photopolymerization initiators, preference is given to using 2, 4-diethylthioxanthone and/or 2-methyl-1- (4-methylthiophenyl) -2-morpholinopropane-1-one.
The content of the photopolymerization initiator in the 1 st active energy ray-curable composition is preferably 0.1 part by mass or more, more preferably 0.05 part by mass or more, still more preferably 0.1 part by mass or more, and further preferably 20 parts by mass or less, more preferably 10 parts by mass or less, still more preferably 5 parts by mass or less, based on 100 parts by mass of the curable component (radical-polymerizable compound).
In the case where the active energy ray-curable composition is a cationically polymerizable composition, the composition contains a cationically 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 multifunctional cationically polymerizable compound having two or more cationically polymerizable functional groups. The monofunctional cation polymerizable compound has a relatively low liquid viscosity, and by blending such a monofunctional cation polymerizable compound into a resin composition, the viscosity of the resin composition can be reduced. In addition, monofunctional cationically polymerizable compounds often have functional groups that exhibit various functions. By blending such a monofunctional cationically polymerizable compound in a resin composition, the resin composition and/or a cured product of the resin composition can exhibit various functions. On the other hand, curing of the resin composition containing the multifunctional cationically polymerizable compound can give a cured product having a 3-dimensional crosslinking unit (the multifunctional cationically polymerizable compound functions as a crosslinking agent), and from such a point of view, it is preferable to use the multifunctional cationically polymerizable compound. When the monofunctional cationically polymerizable compound is used in combination with the polyfunctional cationically polymerizable compound, the amount of the polyfunctional cationically polymerizable compound to 100 parts by mass of the monofunctional cationically polymerizable compound is, for example, 10 parts by mass or more and, for example, 1000 parts by mass or less. Examples of the cationically polymerizable functional group include: epoxy, oxetane, and vinyl ether groups. Examples of the compound having an epoxy group include: aliphatic epoxy compounds, alicyclic epoxy compounds, and aromatic epoxy compounds. As the compound having an epoxy group, an alicyclic epoxy compound is preferably used from the viewpoints of curability and adhesiveness of the cationic polymerizable composition. Examples of the alicyclic epoxy compound include: 3, 4-epoxycyclohexylmethyl-3, 4-epoxycyclohexane carboxylate, or caprolactone modification, trimethylcaprolactone modification, and valerolactone modification of 3, 4-epoxycyclohexylmethyl-3, 4-epoxycyclohexane carboxylate. Examples of the commercially available alicyclic epoxy compound include: CELLOCHODE 2021, CELLOCHODE 2021A, CELLOXIDE 2021P, CELLOXIDE 2081, CELLOCHODE 2083, and CELLOCHODE 2085 (manufactured by DACHINESL CORPORATION, supra), and Cyracure UVR-6105, cyracure UVR-6107, cyracure 30, and R-6110 (manufactured by Dow Chemical Japan Ltd, supra) may be mentioned. From the viewpoints of improvement of curability and reduction of 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. Examples of the compound having an oxetanyl group include: 3-ethyl-3-hydroxymethyl oxetane, 1, 4-bis [ (3-ethyl-3-oxetanyl) methoxymethyl ] benzene, 3-ethyl-3- (phenoxymethyl) oxetane, bis [ (3-ethyl-3-oxetanyl) methyl ] ether, 3-ethyl-3- (2-ethylhexyloxymethyl) oxetane, and phenol novolac oxetane. Examples of commercial products of the oxetanyl group-containing compound include: ARON OXETANE OXT-101, ARON OXETANE OXT-121, ARON OXETANE OXT-211, ARON OXETANE OXT-221, ARON OXETANE OXT-212 (manufactured by east Asian Synthesis Co., ltd.). Examples of the compound having a vinyl ether group include: 2-hydroxyethyl vinyl ether, diethylene glycol monovinyl ether, 4-hydroxybutyl vinyl ether, diethylene glycol monovinyl ether, triethylene glycol divinyl ether, cyclohexanedimethanol monovinyl ether, tricyclodecane vinyl ether, cyclohexyl vinyl ether, methoxyethyl vinyl ether, ethoxyethyl vinyl ether, and pentaerythritol-type tetravinyl ether.
In the case where 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 photo-cationic polymerization initiator. The photo-cationic polymerization initiator is irradiated with active energy rays (visible light, ultraviolet rays, X-rays, electron beams, etc.) to generate a cationic species or lewis acid, thereby initiating polymerization of the cationically polymerizable functional group. The photo cation polymerization initiator may be a photoacid generator or a photobase generator, and preferably a photoacid generator is used. When the active energy ray-curable composition is a visible light-curable composition, it is particularly preferable to use a photo-cationic polymerization initiator having high sensitivity to light of 380nm or more. In addition, in the case of using a photo-cationic polymerization initiator, it is preferable to use a photosensitizer exhibiting a great absorption for light of a wavelength longer than 380nm in combination. The photo-cationic polymerization initiator is a compound that generally exhibits a great absorption in a wavelength region around 300nm or shorter than 300nm, and therefore, by using a photosensitizer exhibiting a great absorption at a light longer than 380nm in combination, it is possible to efficiently utilize a light longer than 380nm to promote the generation of a cationic species or a lewis acid from the photo-cationic polymerization initiator. Examples of the photosensitizer include: the anthracene compound, pyrene compound, carbonyl compound, organosulfur compound, persulfate, redox compound, azo compound, diazo compound, halogen compound, and photoreductive pigment may be used alone or in combination of two or more. In particular, an anthracene compound is preferable because of excellent photosensitizing effect. Examples of commercial products of anthracene compounds used as photosensitizers include: anthracure UVS-1331 and Anthracure UVS-1221 (manufactured by Kawasaki chemical Co., ltd.). The content of the photosensitizer in the composition is, for example, 0.1 to 5% by weight.
The 1 st active energy ray-curable composition may contain an oligomer. The oligomer may be an acrylic oligomer, a fluorine oligomer, or a silicone oligomer, and an acrylic oligomer may be preferably used. The incorporation of the oligomer into the 1 st active energy ray-curable composition contributes to the adjustment of the viscosity of the composition and also contributes to the suppression of shrinkage of the composition upon curing. The suppression of curing shrinkage of the 1 st active energy ray-curable composition is preferable for reducing the interfacial stress between the formed adhesive layer 31 and the optical films 10, 21. The suppression of the interface stress helps to ensure the bonding force between the optical films 10, 21.
Examples of the (meth) acrylic monomer that forms the acrylic oligomer include: alkyl (meth) acrylates having 1 to 20 carbon atoms, cycloalkyl (meth) acrylates, aralkyl (meth) acrylates, polycyclic (meth) acrylates, hydroxyl-containing (meth) acrylates, and halogen-containing (meth) acrylates. Examples of the alkyl (meth) acrylate include: 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, sec-butyl (meth) acrylate, tert-butyl (meth) acrylate, n-pentyl (meth) acrylate, tert-pentyl (meth) acrylate, 3-pentyl (meth) acrylate, 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, and n-octadecyl (meth) acrylate. Examples of the cycloalkyl (meth) acrylate include: cyclohexyl (meth) acrylate, and cyclopentyl (meth) acrylate. Examples of the aralkyl (meth) acrylate include benzyl (meth) acrylate. Examples of the polycyclic (meth) acrylate include: 2-isobornyl (meth) acrylate, 2-norbornyl methyl (meth) acrylate, 5-norbornen-2-ylmethyl (meth) acrylate, and 3-methyl-2-norbornyl methyl (meth) acrylate. Examples of the hydroxyl group-containing (meth) acrylate include: hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2, 3-dihydroxypropyl methyl butyl (meth) acrylate. Examples of the halogen-containing (meth) acrylate include: 2, 2-trifluoroethyl (meth) acrylate, 2-trifluoroethyl (meth) acrylate, tetrafluoropropyl (meth) acrylate, hexafluoropropyl (meth) acrylate, octafluoropentanyl (meth) acrylate, heptadecafluorodecyl (meth) acrylate. These (meth) acrylates may be used alone or in combination of two or more.
The weight average molecular weight (Mw) of the acrylic oligomer is preferably 15000 or less, more preferably 10000 or less, and further preferably 5000 or less. The Mw of the acrylic oligomer is preferably 500 or more, more preferably 1000 or more, and further preferably 1500 or more.
The content of the acrylic oligomer in the 1 st active energy ray-curable composition is preferably 2% by mass or more, more preferably 4% by mass or more, and further preferably 20% by mass or less, more preferably 15% by mass or less.
The 1 st active energy ray-curable composition may contain other components. The other components include a silane coupling agent, a leveling agent, a surfactant, a plasticizer, and an ultraviolet absorber. The blending amount of the other component is preferably 10 parts by mass or less, more preferably 5 parts by mass or less, still more preferably 3 parts by mass or less, and further, for example, 0.01 parts by mass or more, relative to 100 parts by mass of the curable component.
From the viewpoint of coatability in a coating step described later, the viscosity of the 1 st active energy ray-curable composition at 25 ℃ is preferably 3mpa·s or more, more preferably 5mpa·s or more, still more preferably 10mpa·s or more, and is preferably 100mpa·s or less, more preferably 50mpa·s or less, still more preferably 30mpa·s or less. The viscosity of the composition was measured by an E-type viscometer (cone-plate type viscometer).
The adhesive layer 32 is, for example, a cured product of the 2 nd adhesive composition (active energy ray-curable composition) containing an active energy ray-curable resin. Examples of the 2 nd active energy ray-curable composition include: electron beam curable composition, ultraviolet curable composition, and visible light curable composition. Of these, the 2 nd active energy ray-curable composition and the 1 st active energy ray-curable composition may be the same type of composition or may be different types of composition. In the present embodiment, the 2 nd active energy ray-curable composition is a radical-polymerizable composition.
As the component contained in the 2 nd active energy ray-curable composition, the component described as the component contained in the 1 st active energy ray-curable composition can be used. The content range of the component of the 2 nd active energy ray-curable composition is the same as the range described as the content range of the component of the 1 st active energy ray-curable composition. The composition of the 2 nd active energy ray-curable composition may be the same as or different from the composition of the 1 st active energy ray-curable composition.
The laminated optical film X can be manufactured as follows, for example.
First, the 1 st active energy ray-curable composition is applied to one surface (the surface to be bonded) of the optical film 21, and a 1 st coating film of the composition is formed (1 st coating step). Further, the 2 nd active energy ray-curable composition is applied to one surface (the surface to be bonded) of the optical film 22, and a 2 nd coating film of the composition is formed (2 nd coating step). Before each coating step, the surface of the optical film to be bonded may be subjected to a surface modification treatment. Examples of the surface modification treatment include corona treatment, plasma treatment, excimer treatment, and flame treatment. Examples of the coating method in this step include: reverse coating, gravure coating, bar reverse coating, roll coating, die coating, wire bar coating, and bar coating.
Next, the optical film 21 is bonded to one surface of the optical film 10 with the 1 st coating film interposed therebetween, and the optical film 22 is bonded to the other surface of the optical film 10 with the 2 nd coating film interposed therebetween. For example, a roll laminator that performs two lamination processes simultaneously may be used for lamination.
Next, the 1 st coating film and the 2 nd coating film are irradiated with an active energy ray, the 1 st coating film is cured to form the adhesive layer 31, and the 2 nd coating film is cured to form the adhesive layer 32 (the adhesive layers 31, 32 are not pressure-sensitive adhesive layers). Thereby, the optical films 10 and 21 are bonded to each other through the adhesive layer 31, and the optical films 10 and 22 are bonded to each other through the adhesive layer 32.
In this step, from the viewpoint of suppressing deterioration of the optical film 10 as a functional optical film, it is preferable to irradiate active energy rays for curing the 1 st coating film from the optical film 21 side and irradiate active energy rays for curing the 2 nd coating film from the optical film 22 side. As the active energy ray, electron beam, ultraviolet ray, and visible light can be used. Examples of the electron beam irradiation device include an electron beam accelerator. Examples of the light source for ultraviolet light and visible light include: LED lamps, gallium-enclosed metal halide lamps, low-pressure mercury lamps, medium-pressure mercury lamps, high-pressure mercury lamps, ultrahigh-pressure mercury lamps, xenon lamps, halogen lamps, and gallium lamps. In this step, a wavelength blocking filter for blocking light in a partial wavelength range of ultraviolet light and/or visible light emitted from the light source may be used as necessary.
The laminated optical film X can be manufactured, for example, as described above.
Examples
The present invention will be specifically described with reference to examples, but the present invention is not limited to the examples. The specific numerical values such as the blending amount (content), physical property value, and parameter described below may be replaced with the upper limit (numerical value defined in the form of "below" or "less") or the lower limit (numerical value defined in the form of "above" or "exceeding") of the blending amount (content), physical property value, and parameter described in the above-described "specific embodiment" corresponding thereto.
Example 1
The following components were mixed at 25℃for 1 hour in accordance with the compounding amounts (compounding amounts in terms of solid components) shown in Table 1 to prepare adhesive compositions (preparation steps), and the unit of the compounding amounts shown in Table 1 is relative "parts by mass".
LIGHT ACRYLATE POB-A (monomer): 3-phenoxybenzyl acrylate, manufactured by Kabushiki Kaisha Co., ltd
LIGHT ACRYLATE P2H-A (monomer): phenoxydiglycol acrylate, manufactured by co-mingling chemical Co., ltd
Aronix M-5700 (monomer): 2-hydroxy-3-phenoxypropyl acrylate, manufactured by Toyama Synthesis Co., ltd
Aronix M-220 (monomer): tripropylene glycol diacrylate, manufactured by Toyama Synthesis Co., ltd
HEAA (monomer): hydroxyethyl acrylamide, manufactured by KJ chemical Co., ltd
DEAA (monomer): diethyl acrylamide, KJ chemical Co., ltd
Ominiirad 907 (photopolymerization initiator): 2-methyl-1- (4-methylthiophenyl) -2-morpholinopropan-1-one manufactured by IGM Resins Co
KAYACURE DETX-S (photopolymerization initiator): 2, 4-Diethylthioxanthone, manufactured by Nippon Kaiki Kaisha Co., ltd
Arufon 1190 (acrylic oligomer): viscosity 6000 mPas (25 ℃ C.), mw1700, tg-50 ℃ C. And manufactured by Toyama Synthesis Co., ltd
BYK-UV3505 (leveling agent): modified polydimethylsiloxane having acryl group, manufactured by BYK Co
TABLE 1
Next, a coating process is performed, specifically as follows. An adhesive composition was applied to a COP Film (trade name "ZEONOR Film ZF14", manufactured by Japanese patent application No. Weng Zhushi Co., ltd.) having a thickness of 23 μm as a 1 st transparent protective Film, to form a 1 st adhesive coating Film having a thickness of 1 μm. On the other hand, an adhesive composition was applied to a COP Film (trade name "ZEONOR Film ZF14", manufactured by japan patent application No. Weng Zhushi) having a thickness of 23 μm as a 2 nd transparent protective Film, to form a 2 nd adhesive coating Film having a thickness of 1 μm. Each coating was performed using an MCD coater (manufactured by fuji machinery corporation) (the cell shape was a honeycomb, the number of gravure lines was 1000/inch, and the rotational speed was 140%/line speed).
Next, the 1 st transparent protective film with the 1 st adhesive coating film, the polarizer film, and the 2 nd transparent protective film with the 2 nd adhesive coating film are bonded (bonding step). Specifically, the 1 st adhesive coating side of the 1 st transparent protective film is bonded to one surface of the polarizer film and the 2 nd adhesive coating side of the 2 nd transparent protective film is bonded to the other surface of the polarizer film by a roll laminator.
Next, the 1 st adhesive coating film is irradiated with ultraviolet light from the 1 st transparent protective film side, and the 2 nd adhesive coating film is irradiated with ultraviolet light from the 2 nd transparent protective film side, whereby the adhesive coating film between the films is cured (curing step). Ultraviolet irradiation was performed using an ultraviolet irradiation device (trade name "Light HAMMER10", valve: V valve, fusion UV Systems, manufactured by Inc corporation) having a metal halide lamp in which gallium is enclosed as a Light source. In the ultraviolet irradiation, the peak illuminance was set to 1600mW/cm 2 Setting the cumulative irradiation amount to 1000mJ/cm 2 (wavelength 380 to 440 nm) (illuminance was measured using a "Sola-Check System" manufactured by Solatell Co.). Thus, the 1 st transparent protective film and the polarizer film, and the 2 nd transparent protective film and the polarizer film were bonded to each other, thereby obtaining a laminated optical film.
The laminated optical film of example 1 was produced as described above. The laminated optical film of example 1 includes, in order in the thickness direction, a 1 st transparent protective film (thickness 23 μm), a 1 st adhesive layer, a polarizer film (thickness 5 μm), a 2 nd adhesive layer, and a 2 nd transparent protective film (thickness 23 μm).
Example 2
A laminated optical film of example 2 (1 st transparent protective film/1 st adhesive layer/polarizing film/2 nd adhesive layer/2 nd transparent protective film) was produced in the same manner as the laminated optical film of example 1, except for the following operations.
In the preparation process, adhesive compositions were prepared according to the compositions shown in table 1. For the monomer, "LIGHT ACRYLATE 1.9.9 ND-A" (1, 9-nonanediol diacrylate) manufactured by Kyowase:Sub>A chemical Co., ltd.) and "LIGHT ACRYLATE HPP-A" (hydroxypivalic acid neopentyl glycol acrylic acid adduct) manufactured by Kyowase:Sub>A chemical Co., ltd.) were used instead of "LIGHT ACRYLATE POB-A" and "LIGHT ACRYLATE P2H-A". In the coating step, the thickness of the 1 st adhesive layer coating film formed on the 1 st transparent protective film was set to 2.3 μm, and the thickness of the 2 nd adhesive layer coating film formed on the 2 nd transparent protective film was set to 2.3 μm.
Example 3
A laminated optical film of example 3 (1 st transparent protective film/1 st adhesive layer/polarizing film/2 nd adhesive layer/2 nd transparent protective film) was produced in the same manner as the laminated optical film of example 1, except for the following operations.
In the preparation process, adhesive compositions were prepared according to the compositions shown in table 1. As one of the monomer components, acryloylmorpholine (trade name "ACMO-LI", manufactured by KJ chemical Co., ltd.) was used. In the coating step, the thickness of the 1 st adhesive layer coating film formed on the 1 st transparent protective film was set to 0.8 μm, and the thickness of the 2 nd adhesive layer coating film formed on the 2 nd transparent protective film was set to 0.8 μm.
Example 4
A laminated optical film of example 4 (1 st transparent protective film/1 st adhesive layer/polarizing film/2 nd adhesive layer/2 nd transparent protective film) was produced in the same manner as the laminated optical film of example 1, except for the following operations.
In the preparation step, the amount of "LIGHT ACRYLATE POB-A" was 43 parts by mass, the amount of "LIGHT ACRYLATE P H-A" was 29 parts by mass, the amount of "AronixM-220" was 3 parts by mass, and in the coating step, the thickness of the 1 st adhesive layer coating film formed on the 1 st transparent protective film was 0.7. Mu.m, and the thickness of the 2 nd adhesive layer coating film formed on the 2 nd transparent protective film was 0.7. Mu.m.
Comparative example 1
A laminated optical film of comparative example 1 (1 st transparent protective film/1 st adhesive layer/polarizing film/2 nd adhesive layer/2 nd transparent protective film) was produced in the same manner as the laminated optical film of example 2, except for the following operation.
In the preparation step, the amount of "LIGHT ACRYLATE 1.9ND-A" was 40 parts by mass, and the amount of "LIGHT ACRYLATE HPP-A" was 9 parts by mass. In the coating step, the thickness of the 1 st adhesive layer coating film formed on the 1 st transparent protective film was set to 0.8 μm, and the thickness of the 2 nd adhesive layer coating film formed on the 2 nd transparent protective film was set to 0.8 μm.
Thickness of adhesive layer
The thickness of each adhesive layer in each of the laminated optical films of examples 1 to 4 and comparative example 1 was measured as follows. First, a film sheet (laminated optical film) of 5mm×10mm was cut out from the laminated optical film. Next, the laminated optical film was cut by the frozen section method. Specifically, the laminated optical film was cooled to-30 ℃, cut with a hard knife along the thickness direction of the film, then returned to room temperature, and then the cut surface of the laminated optical film, on which the cut surface was formed, was subjected to conductive treatment with a thickness of 5nm or less, whereby an observation sample was obtained. Next, the thickness of the adhesive layer was measured by SEM observation of the observation sample. Specifically, the secondary electron image of the cut surface in the observation sample was observed and photographed using a scanning electron microscope (trade name "reulus 8220", manufactured by HITACHI corporation), and the thickness of each adhesive layer was measured. In this observation, the thickness (μm) of the 1 st adhesive layer and the thickness (μm) of the 2 nd adhesive layer are shown in table 2, with the acceleration voltage being 3.0kV, the current amount being 10 μa, the working distance being 8mm, the magnification being 10 ten thousand times, the detection mode being the upper+lower mode.
Peel strength
The 90 ° peel strength between the 1 st transparent protective film and the polarizer film in each of the laminated optical films of examples 1 to 4 and comparative example 1 was examined. First, a sample film having dimensions of 200mm 1 st side by 15mm 2 nd side was cut out from a laminated optical film, and the 1 st side was a side extending in the stretching direction of the polarizing film, and the 2 nd side was a side extending in a direction orthogonal to the stretching direction. Next, the 2 nd transparent protective film side of the sample film was attached to the glass plate via a strong adhesive. Next, the 90℃peel strength (N/15 mm) of the 1 st transparent protective film and the polarizer film was measured by a Tensilon universal tester (trade name "RTC", manufactured by A & D). In this measurement, the 1 st chuck provided in the Tensilon universal tester was used to hold the 1 st transparent protective film of the sample film from the glass plate to the polarizing film, and the 2 nd chuck provided in the tester was used to hold the 1 st transparent protective film of the sample film. In the present measurement, the measured temperature was 25 ℃, the peeling angle was 90 °, the peeling speed was 1000 mm/min, and the measured 90 ° peel strength F1 (N/15 mm) was shown in table 2.
Press-in elastic modulus
The elastic modulus of the 1 st adhesive layer in each of the laminated optical films of examples 1 to 4 and comparative example 1 was examined by nanoindentation. Specifically, first, a film sheet (laminated optical film) of 5mm×10mm was cut out from the laminated optical film. Next, the laminated optical film was cut by a freeze-slicing method, specifically, the laminated optical film was cooled to-30 ℃, and then cut with a hard knife along the thickness direction of the film, and then returned to room temperature, thereby obtaining a sample for measurement. Next, load-displacement measurement of the exposed surface of the 1 st adhesive layer of the measurement sample was performed by using a nanoindenter (trade name "TI950 triboindenor", manufactured by Hysitron corporation) based on JIS Z2255:2003, and a load-displacement curve was obtained. In this measurement, the measurement mode was set to a single press-in measurement, the measurement temperature was set to 25 ℃, the used indenter was set to a Berkovich (triangular pyramid) diamond indenter, the maximum press-in depth (maximum displacement hmax) of the indenter to the measurement sample during load application was set to 200nm, the press-in speed of the indenter was set to 10 nm/sec, and the pull-out speed of the indenter from the measurement sample during load release was set to 10 nm/sec (measurement condition 1). The resulting assay was then run through a proprietary analytical software (Ver.9.4.0.1) of "TI950 Triboindeter The data is processed. Specifically, based on the obtained load (f) -displacement (h) curve, the maximum load fmax (load acting on the indenter at the maximum displacement hmax), the contact projected area S (projected area of the contact area between the indenter and the specimen at the time of maximum load), and the slope D of the tangent line of the load-displacement curve at the time of the start of the load release process are obtained. Then, the pressing elastic modulus (= (pi) of the 1 st adhesive layer was calculated from the slope D and the contact projection area S 1/2 D)/(2S 1/2 ) Table 2 shows the values as the press-in elastic modulus M1 (GPa). Table 2 also shows the ratio (F1/M1) of the 90℃peel strength F1 to the press-in elastic modulus M1.
On the other hand, the load-displacement measurement by the nanoindenter was performed under the same measurement conditions (measurement condition 2) as those under the measurement condition 1 except that the maximum indentation depth was changed from 200nm to 50 nm. Then, the obtained measurement data was processed by dedicated analysis software (ver.9.4.0.1) of "TI950 triboindanter", and the indentation elastic modulus of the adhesive layer was calculated, and the value thereof was shown in table 2 as indentation elastic modulus M2 (GPa) (indentation elastic modulus M2 is the 2 nd indentation elastic modulus described above). The ratio (F1/M2) of the peel strength F1 to the press-in elastic modulus M2 is also shown in Table 2.
Evaluation of peeling inhibition at bending
For each of the laminated optical films of examples 1 to 4 and comparative example 1, the presence or absence of peeling between the films after the bending test was examined as follows. First, a sample for test (15 mm. Times.110 mm) was cut out from the laminated optical film of example 1 and prepared. Next, for the sample, an MIT test was performed using an MIT TESTER (trade name "MIT bending resistance TESTER BE-202", manufactured by TESTER SANGYO Co., ltd.). In this bending test, the sample was mounted on a tester so that the 1 st transparent protective film and the 1 st adhesive layer were bent inward with respect to the polarizer film. In this test, the test temperature was 25 ℃, the bending angle was 135 degrees, the bending speed was 175 times per minute, and the number of bending times was 5000, and then the presence or absence of peeling between the 1 st transparent protective film and the 1 st adhesive layer was confirmed by visual inspection. The results of the evaluation of "good" when no peeling occurred between the 1 st transparent protective film and the polarizer film and the evaluation of "bad" when peeling occurred are shown in table 2.
Industrial applicability
The laminated optical film of the present invention can be used as an element contained in a laminated structure of a display panel such as a foldable display panel.
Claims (5)
1. A laminated optical film comprising, in order in the thickness direction, a 1 st optical film, an adhesive layer, and a 2 nd optical film,
the adhesive layer is bonded to the 1 st optical film and bonded to the 2 nd optical film,
the ratio of the 90 DEG peel strength F1 of the 2 nd optical film to the 1 st optical film at 25 ℃ to the press-in elastic modulus M1 (GPa) at 25 ℃ of the adhesive layer is 8 or more.
2. The laminated optical film according to claim 1, wherein,
the 90 DEG peel strength F1 is 0.8N/15mm or more. .
3. The laminated optical film according to claim 1, wherein,
the press-in elastic modulus M1 is 0.2GPa or less.
4. The laminated optical film according to claim 1, wherein,
the adhesive layer has a thickness of 5 μm or less.
5. The laminated optical film according to any one of claims 1 to 4, wherein,
the 1 st optical film is a polarizer film.
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| Application Number | Priority Date | Filing Date | Title |
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| JP2021-077101 | 2021-04-30 | ||
| JP2021077101 | 2021-04-30 | ||
| PCT/JP2022/018915 WO2022230888A1 (en) | 2021-04-30 | 2022-04-26 | Layered optical film |
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| CN117098656A true CN117098656A (en) | 2023-11-21 |
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| JP (1) | JPWO2022230888A1 (en) |
| KR (1) | KR20240004225A (en) |
| CN (1) | CN117098656A (en) |
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| WO2017086338A1 (en) * | 2015-11-20 | 2017-05-26 | 日東電工株式会社 | Optical laminated body and organic electroluminescence display device using same |
| JP6097815B1 (en) * | 2015-12-18 | 2017-03-15 | 古河電気工業株式会社 | Adhesive composition, adherend bonding method using the same, and laminate manufacturing method |
| KR102494986B1 (en) * | 2016-01-11 | 2023-02-03 | 삼성디스플레이 주식회사 | Foldable display device |
| TWI782066B (en) * | 2017-08-03 | 2022-11-01 | 德商漢高股份有限及兩合公司 | Curable silicone optically clear adhesives and uses thereof |
| JP7137900B2 (en) | 2018-02-26 | 2022-09-15 | 日東電工株式会社 | Active energy ray-curable adhesive composition, polarizing film and method for producing same, optical film, and image display device |
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- 2022-04-26 JP JP2023517564A patent/JPWO2022230888A1/ja active Pending
- 2022-04-26 WO PCT/JP2022/018915 patent/WO2022230888A1/en active Application Filing
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| KR20240004225A (en) | 2024-01-11 |
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