CN109076661B - Sealing agent for organic EL display element - Google Patents
Sealing agent for organic EL display element Download PDFInfo
- Publication number
- CN109076661B CN109076661B CN201780023757.4A CN201780023757A CN109076661B CN 109076661 B CN109076661 B CN 109076661B CN 201780023757 A CN201780023757 A CN 201780023757A CN 109076661 B CN109076661 B CN 109076661B
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- China
- Prior art keywords
- organic
- display element
- polymerization initiator
- sealant
- weight
- Prior art date
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- 238000007789 sealing Methods 0.000 title claims abstract description 49
- 239000000565 sealant Substances 0.000 claims abstract description 72
- 150000001875 compounds Chemical class 0.000 claims abstract description 62
- 238000000034 method Methods 0.000 claims abstract description 53
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 45
- 239000003505 polymerization initiator Substances 0.000 claims abstract description 32
- -1 oxetane compound Chemical class 0.000 claims description 110
- 238000000576 coating method Methods 0.000 claims description 26
- 239000011248 coating agent Substances 0.000 claims description 25
- 239000007870 radical polymerization initiator Substances 0.000 claims description 12
- 238000010538 cationic polymerization reaction Methods 0.000 claims description 11
- 238000009835 boiling Methods 0.000 claims description 10
- 239000002904 solvent Substances 0.000 claims description 6
- 239000004593 Epoxy Substances 0.000 claims description 5
- 238000010943 off-gassing Methods 0.000 abstract description 10
- 239000000758 substrate Substances 0.000 description 46
- 238000010438 heat treatment Methods 0.000 description 34
- 239000003822 epoxy resin Substances 0.000 description 25
- 229920000647 polyepoxide Polymers 0.000 description 25
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 23
- 239000010410 layer Substances 0.000 description 23
- 239000000463 material Substances 0.000 description 23
- LWNGJAHMBMVCJR-UHFFFAOYSA-N (2,3,4,5,6-pentafluorophenoxy)boronic acid Chemical compound OB(O)OC1=C(F)C(F)=C(F)C(F)=C1F LWNGJAHMBMVCJR-UHFFFAOYSA-N 0.000 description 17
- NFHFRUOZVGFOOS-UHFFFAOYSA-N palladium;triphenylphosphane Chemical compound [Pd].C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 NFHFRUOZVGFOOS-UHFFFAOYSA-N 0.000 description 16
- 229910010272 inorganic material Inorganic materials 0.000 description 15
- 239000011147 inorganic material Substances 0.000 description 15
- 239000011521 glass Substances 0.000 description 12
- 229920005989 resin Polymers 0.000 description 11
- 239000011347 resin Substances 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 10
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 10
- 239000012298 atmosphere Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 9
- 238000002834 transmittance Methods 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 239000006087 Silane Coupling Agent Substances 0.000 description 8
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 8
- 239000007789 gas Substances 0.000 description 8
- 229910052581 Si3N4 Inorganic materials 0.000 description 7
- 239000003607 modifier Substances 0.000 description 7
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 7
- UCBQKJQXUPVHFJ-UHFFFAOYSA-N 1-cyclopenta-2,4-dien-1-yl-2-propan-2-ylbenzene Chemical compound CC(C)C1=CC=CC=C1C1C=CC=C1 UCBQKJQXUPVHFJ-UHFFFAOYSA-N 0.000 description 6
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 6
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 229920003986 novolac Polymers 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 5
- 229910052753 mercury Inorganic materials 0.000 description 5
- 239000004033 plastic Substances 0.000 description 5
- 229920003023 plastic Polymers 0.000 description 5
- 238000000151 deposition Methods 0.000 description 4
- LTYMSROWYAPPGB-UHFFFAOYSA-O diphenylsulfanium Chemical compound C=1C=CC=CC=1[SH+]C1=CC=CC=C1 LTYMSROWYAPPGB-UHFFFAOYSA-O 0.000 description 4
- 230000001678 irradiating effect Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 238000005268 plasma chemical vapour deposition Methods 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 229920001187 thermosetting polymer Polymers 0.000 description 4
- HECLRDQVFMWTQS-RGOKHQFPSA-N 1755-01-7 Chemical compound C1[C@H]2[C@@H]3CC=C[C@@H]3[C@@H]1C=C2 HECLRDQVFMWTQS-RGOKHQFPSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical class S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 3
- QYKIQEUNHZKYBP-UHFFFAOYSA-N Vinyl ether Chemical class C=COC=C QYKIQEUNHZKYBP-UHFFFAOYSA-N 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 125000003647 acryloyl group Chemical group O=C([*])C([H])=C([H])[H] 0.000 description 3
- 125000002723 alicyclic group Chemical group 0.000 description 3
- 239000003513 alkali Substances 0.000 description 3
- 150000003863 ammonium salts Chemical class 0.000 description 3
- 125000000129 anionic group Chemical group 0.000 description 3
- 230000008033 biological extinction Effects 0.000 description 3
- 230000008021 deposition Effects 0.000 description 3
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 3
- 229910001873 dinitrogen Inorganic materials 0.000 description 3
- KZTYYGOKRVBIMI-UHFFFAOYSA-N diphenyl sulfone Chemical compound C=1C=CC=CC=1S(=O)(=O)C1=CC=CC=C1 KZTYYGOKRVBIMI-UHFFFAOYSA-N 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 238000005227 gel permeation chromatography Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 238000001771 vacuum deposition Methods 0.000 description 3
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2,2'-azo-bis-isobutyronitrile Substances N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 description 2
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- KWOLFJPFCHCOCG-UHFFFAOYSA-N Acetophenone Chemical compound CC(=O)C1=CC=CC=C1 KWOLFJPFCHCOCG-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- RWCCWEUUXYIKHB-UHFFFAOYSA-N benzophenone Chemical compound C=1C=CC=CC=1C(=O)C1=CC=CC=C1 RWCCWEUUXYIKHB-UHFFFAOYSA-N 0.000 description 2
- 239000012965 benzophenone Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- PXKLMJQFEQBVLD-UHFFFAOYSA-N bisphenol F Chemical compound C1=CC(O)=CC=C1CC1=CC=C(O)C=C1 PXKLMJQFEQBVLD-UHFFFAOYSA-N 0.000 description 2
- 125000002091 cationic group Chemical group 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000007872 degassing Methods 0.000 description 2
- 239000012954 diazonium Substances 0.000 description 2
- ZUOUZKKEUPVFJK-UHFFFAOYSA-N diphenyl Chemical compound C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 description 2
- USIUVYZYUHIAEV-UHFFFAOYSA-N diphenyl ether Chemical compound C=1C=CC=CC=1OC1=CC=CC=C1 USIUVYZYUHIAEV-UHFFFAOYSA-N 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 230000005525 hole transport Effects 0.000 description 2
- 230000001976 improved effect Effects 0.000 description 2
- PQXKHYXIUOZZFA-UHFFFAOYSA-M lithium fluoride Chemical compound [Li+].[F-] PQXKHYXIUOZZFA-UHFFFAOYSA-M 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- IBHBKWKFFTZAHE-UHFFFAOYSA-N n-[4-[4-(n-naphthalen-1-ylanilino)phenyl]phenyl]-n-phenylnaphthalen-1-amine Chemical compound C1=CC=CC=C1N(C=1C2=CC=CC=C2C=CC=1)C1=CC=C(C=2C=CC(=CC=2)N(C=2C=CC=CC=2)C=2C3=CC=CC=C3C=CC=2)C=C1 IBHBKWKFFTZAHE-UHFFFAOYSA-N 0.000 description 2
- QWVGKYWNOKOFNN-UHFFFAOYSA-N o-cresol Chemical compound CC1=CC=CC=C1O QWVGKYWNOKOFNN-UHFFFAOYSA-N 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 150000001451 organic peroxides Chemical class 0.000 description 2
- 125000005702 oxyalkylene group Chemical group 0.000 description 2
- 150000004714 phosphonium salts Chemical class 0.000 description 2
- 229920001223 polyethylene glycol Polymers 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 229920002223 polystyrene Polymers 0.000 description 2
- 150000003254 radicals Chemical class 0.000 description 2
- GHMLBKRAJCXXBS-UHFFFAOYSA-N resorcinol Chemical compound OC1=CC=CC(O)=C1 GHMLBKRAJCXXBS-UHFFFAOYSA-N 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 230000001235 sensitizing effect Effects 0.000 description 2
- UWHCKJMYHZGTIT-UHFFFAOYSA-N tetraethylene glycol Chemical compound OCCOCCOCCOCCO UWHCKJMYHZGTIT-UHFFFAOYSA-N 0.000 description 2
- YRHRIQCWCFGUEQ-UHFFFAOYSA-N thioxanthen-9-one Chemical compound C1=CC=C2C(=O)C3=CC=CC=C3SC2=C1 YRHRIQCWCFGUEQ-UHFFFAOYSA-N 0.000 description 2
- 125000002023 trifluoromethyl group Chemical group FC(F)(F)* 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- 229960000834 vinyl ether Drugs 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- 229910052724 xenon Inorganic materials 0.000 description 2
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 2
- QNODIIQQMGDSEF-UHFFFAOYSA-N (1-hydroxycyclohexyl)-phenylmethanone Chemical compound C=1C=CC=CC=1C(=O)C1(O)CCCCC1 QNODIIQQMGDSEF-UHFFFAOYSA-N 0.000 description 1
- VLTYTTRXESKBKI-UHFFFAOYSA-N (2,4-dichlorophenyl)-phenylmethanone Chemical compound ClC1=CC(Cl)=CC=C1C(=O)C1=CC=CC=C1 VLTYTTRXESKBKI-UHFFFAOYSA-N 0.000 description 1
- WHOZNOZYMBRCBL-OUKQBFOZSA-N (2E)-2-Tetradecenal Chemical class CCCCCCCCCCC\C=C\C=O WHOZNOZYMBRCBL-OUKQBFOZSA-N 0.000 description 1
- UNMJLQGKEDTEKJ-UHFFFAOYSA-N (3-ethyloxetan-3-yl)methanol Chemical compound CCC1(CO)COC1 UNMJLQGKEDTEKJ-UHFFFAOYSA-N 0.000 description 1
- NQEJEMZJOBCYOD-UHFFFAOYSA-N (4-methoxyphenyl)methyl-dimethyl-phenylazanium Chemical compound C1=CC(OC)=CC=C1C[N+](C)(C)C1=CC=CC=C1 NQEJEMZJOBCYOD-UHFFFAOYSA-N 0.000 description 1
- QKAIFCSOWIMRJG-UHFFFAOYSA-N (4-methylphenyl)-(4-propan-2-ylphenyl)iodanium Chemical compound C1=CC(C(C)C)=CC=C1[I+]C1=CC=C(C)C=C1 QKAIFCSOWIMRJG-UHFFFAOYSA-N 0.000 description 1
- HCNHNBLSNVSJTJ-UHFFFAOYSA-N 1,1-Bis(4-hydroxyphenyl)ethane Chemical compound C=1C=C(O)C=CC=1C(C)C1=CC=C(O)C=C1 HCNHNBLSNVSJTJ-UHFFFAOYSA-N 0.000 description 1
- HIYIGPVBMDKPCR-UHFFFAOYSA-N 1,1-bis(ethenoxymethyl)cyclohexane Chemical compound C=COCC1(COC=C)CCCCC1 HIYIGPVBMDKPCR-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
- MWZJGRDWJVHRDV-UHFFFAOYSA-N 1,4-bis(ethenoxy)butane Chemical compound C=COCCCCOC=C MWZJGRDWJVHRDV-UHFFFAOYSA-N 0.000 description 1
- VSHKLLPSERFSRJ-UHFFFAOYSA-N 1-(naphthalen-1-ylmethyl)pyridin-1-ium-2-carbonitrile Chemical compound N#CC1=CC=CC=[N+]1CC1=CC=CC2=CC=CC=C12 VSHKLLPSERFSRJ-UHFFFAOYSA-N 0.000 description 1
- OBSKXJSZGYXFFB-UHFFFAOYSA-N 1-benzylpyridin-1-ium-2-carbonitrile Chemical compound N#CC1=CC=CC=[N+]1CC1=CC=CC=C1 OBSKXJSZGYXFFB-UHFFFAOYSA-N 0.000 description 1
- SAMJGBVVQUEMGC-UHFFFAOYSA-N 1-ethenoxy-2-(2-ethenoxyethoxy)ethane Chemical compound C=COCCOCCOC=C SAMJGBVVQUEMGC-UHFFFAOYSA-N 0.000 description 1
- RQJCIXUNHZZFMB-UHFFFAOYSA-N 1-ethenoxy-2-(2-ethenoxypropoxy)propane Chemical compound C=COCC(C)OCC(C)OC=C RQJCIXUNHZZFMB-UHFFFAOYSA-N 0.000 description 1
- FOWNZLLMQHBVQT-UHFFFAOYSA-N 1-ethenoxy-2-[2-(2-ethenoxypropoxy)propoxy]propane Chemical compound C=COCC(C)OCC(C)OCC(C)OC=C FOWNZLLMQHBVQT-UHFFFAOYSA-N 0.000 description 1
- SDXHBDVTZNMBEW-UHFFFAOYSA-N 1-ethoxy-2-(2-hydroxyethoxy)ethanol Chemical compound CCOC(O)COCCO SDXHBDVTZNMBEW-UHFFFAOYSA-N 0.000 description 1
- KJCVRFUGPWSIIH-UHFFFAOYSA-N 1-naphthol Chemical compound C1=CC=C2C(O)=CC=CC2=C1 KJCVRFUGPWSIIH-UHFFFAOYSA-N 0.000 description 1
- KWVGIHKZDCUPEU-UHFFFAOYSA-N 2,2-dimethoxy-2-phenylacetophenone Chemical compound C=1C=CC=CC=1C(OC)(OC)C(=O)C1=CC=CC=C1 KWVGIHKZDCUPEU-UHFFFAOYSA-N 0.000 description 1
- OVSKIKFHRZPJSS-UHFFFAOYSA-N 2,4-D Chemical compound OC(=O)COC1=CC=C(Cl)C=C1Cl OVSKIKFHRZPJSS-UHFFFAOYSA-N 0.000 description 1
- 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 1
- YHYCMHWTYHPIQS-UHFFFAOYSA-N 2-(2-hydroxyethoxy)-1-methoxyethanol Chemical compound COC(O)COCCO YHYCMHWTYHPIQS-UHFFFAOYSA-N 0.000 description 1
- MCBXLJCOMLRSQK-UHFFFAOYSA-N 2-(4-sulfanylphenoxy)ethanol Chemical compound OCCOC1=CC=C(S)C=C1 MCBXLJCOMLRSQK-UHFFFAOYSA-N 0.000 description 1
- IITAGOPHHFGANB-UHFFFAOYSA-N 2-(phenoxymethyl)oxetane Chemical compound C1COC1COC1=CC=CC=C1 IITAGOPHHFGANB-UHFFFAOYSA-N 0.000 description 1
- GJKGAPPUXSSCFI-UHFFFAOYSA-N 2-Hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone Chemical compound CC(C)(O)C(=O)C1=CC=C(OCCO)C=C1 GJKGAPPUXSSCFI-UHFFFAOYSA-N 0.000 description 1
- WYGWHHGCAGTUCH-UHFFFAOYSA-N 2-[(2-cyano-4-methylpentan-2-yl)diazenyl]-2,4-dimethylpentanenitrile Chemical compound CC(C)CC(C)(C#N)N=NC(C)(C#N)CC(C)C WYGWHHGCAGTUCH-UHFFFAOYSA-N 0.000 description 1
- WFSMVVDJSNMRAR-UHFFFAOYSA-N 2-[2-(2-ethoxyethoxy)ethoxy]ethanol Chemical compound CCOCCOCCOCCO WFSMVVDJSNMRAR-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
- 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
- UWQPDVZUOZVCBH-UHFFFAOYSA-N 2-diazonio-4-oxo-3h-naphthalen-1-olate Chemical class C1=CC=C2C(=O)C(=[N+]=[N-])CC(=O)C2=C1 UWQPDVZUOZVCBH-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
- NLGDWWCZQDIASO-UHFFFAOYSA-N 2-hydroxy-1-(7-oxabicyclo[4.1.0]hepta-1,3,5-trien-2-yl)-2-phenylethanone Chemical compound OC(C(=O)c1cccc2Oc12)c1ccccc1 NLGDWWCZQDIASO-UHFFFAOYSA-N 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
- 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 1
- PNPLRTWSLDSFET-UHFFFAOYSA-N 2-naphthalen-1-yl-5-phenyl-1,3,4-oxadiazole Chemical compound C1=CC=CC=C1C1=NN=C(C=2C3=CC=CC=C3C=CC=2)O1 PNPLRTWSLDSFET-UHFFFAOYSA-N 0.000 description 1
- 125000003903 2-propenyl group Chemical group [H]C([*])([H])C([H])=C([H])[H] 0.000 description 1
- BIDWUUDRRVHZLQ-UHFFFAOYSA-N 3-ethyl-3-(2-ethylhexoxymethyl)oxetane Chemical compound CCCCC(CC)COCC1(CC)COC1 BIDWUUDRRVHZLQ-UHFFFAOYSA-N 0.000 description 1
- JUXZNIDKDPLYBY-UHFFFAOYSA-N 3-ethyl-3-(phenoxymethyl)oxetane Chemical compound C=1C=CC=CC=1OCC1(CC)COC1 JUXZNIDKDPLYBY-UHFFFAOYSA-N 0.000 description 1
- FNYWFRSQRHGKJT-UHFFFAOYSA-N 3-ethyl-3-[(3-ethyloxetan-3-yl)methoxymethyl]oxetane Chemical compound C1OCC1(CC)COCC1(CC)COC1 FNYWFRSQRHGKJT-UHFFFAOYSA-N 0.000 description 1
- 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 1
- FMGBDYLOANULLW-UHFFFAOYSA-N 3-isocyanatopropyl(trimethoxy)silane Chemical compound CO[Si](OC)(OC)CCCN=C=O FMGBDYLOANULLW-UHFFFAOYSA-N 0.000 description 1
- ATVJXMYDOSMEPO-UHFFFAOYSA-N 3-prop-2-enoxyprop-1-ene Chemical group C=CCOCC=C ATVJXMYDOSMEPO-UHFFFAOYSA-N 0.000 description 1
- SJECZPVISLOESU-UHFFFAOYSA-N 3-trimethoxysilylpropan-1-amine Chemical compound CO[Si](OC)(OC)CCCN SJECZPVISLOESU-UHFFFAOYSA-N 0.000 description 1
- UUEWCQRISZBELL-UHFFFAOYSA-N 3-trimethoxysilylpropane-1-thiol Chemical compound CO[Si](OC)(OC)CCCS UUEWCQRISZBELL-UHFFFAOYSA-N 0.000 description 1
- VPWNQTHUCYMVMZ-UHFFFAOYSA-N 4,4'-sulfonyldiphenol Chemical compound C1=CC(O)=CC=C1S(=O)(=O)C1=CC=C(O)C=C1 VPWNQTHUCYMVMZ-UHFFFAOYSA-N 0.000 description 1
- SXIFAEWFOJETOA-UHFFFAOYSA-N 4-hydroxy-butyl Chemical group [CH2]CCCO SXIFAEWFOJETOA-UHFFFAOYSA-N 0.000 description 1
- 102100033806 Alpha-protein kinase 3 Human genes 0.000 description 1
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- PAYRUJLWNCNPSJ-UHFFFAOYSA-O phenylazanium Chemical compound [NH3+]C1=CC=CC=C1 PAYRUJLWNCNPSJ-UHFFFAOYSA-O 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/02—Details
- H05B33/04—Sealing arrangements, e.g. against humidity
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/87—Passivation; Containers; Encapsulations
- H10K59/873—Encapsulations
Landscapes
- Electroluminescent Light Sources (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Medicinal Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Polymers & Plastics (AREA)
- Epoxy Resins (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Sealing Material Composition (AREA)
- Polyethers (AREA)
Abstract
The purpose of the present invention is to provide a sealing agent for an organic EL display element, which can be easily applied by an ink jet method, has excellent low outgassing properties, and can provide an organic EL display element having excellent reliability. The present invention is a sealant for an organic EL display element, which contains a polymerizable compound and a polymerization initiator, and which has a viscosity of 5 to 50 mPas at 25 ℃, a surface tension of 15 to 35mN/m at 25 ℃, and a volatility of 1% or less after 4 days at 25 ℃.
Description
Technical Field
The present invention relates to a sealing agent for an organic EL display element, which can be easily applied by an ink jet method, has excellent low outgassing properties, and can provide an organic EL display element having excellent reliability.
Background
An organic electroluminescence (hereinafter also referred to as "organic EL") display element has a laminate structure in which an organic light emitting material layer is sandwiched between a pair of electrodes facing each other, and electrons are injected from one electrode into the organic light emitting material layer and holes are injected from the other electrode into the organic light emitting material layer, whereby the electrons and the holes are combined in the organic light emitting material layer and light is emitted. Since the organic EL display element emits light in this manner, the organic EL display element has the following advantages as compared with a liquid crystal display element or the like that requires a backlight: the device has good visibility, can be thinned, and can be driven by DC low voltage.
The organic light-emitting material layer and the electrode constituting the organic EL display device have a problem that their characteristics are easily deteriorated by moisture, oxygen, or the like. Therefore, in order to obtain a practical organic EL display element, it is necessary to isolate the organic light-emitting material layer and the electrode from the atmosphere to achieve a long life. Patent document 1 discloses a method of sealing an organic light emitting material layer and an electrode of an organic EL display element with a laminated film of a silicon nitride film and a resin film formed by a CVD method. Here, the resin film has an effect of preventing the organic layer and the electrode from being pressed by the internal stress of the silicon nitride film.
In the method of sealing with a silicon nitride film disclosed in patent document 1, the organic light emitting material layer and the electrode may not be completely covered when the silicon nitride film is formed due to irregularities on the surface of the organic EL display element, adhesion of foreign matter, occurrence of cracks due to internal stress, and the like. If the coverage based on the silicon nitride film is incomplete, moisture penetrates into the organic light emitting material layer through the silicon nitride film.
As a method for preventing moisture from entering into the organic light emitting material layer, patent document 2 discloses a method of alternately depositing an inorganic material film and a resin film, and patent documents 3 and 4 disclose a method of forming a resin film on an inorganic material film.
As a method for forming a resin film, there is a method in which a sealant is applied to a substrate by an ink jet method and then cured. If a coating method based on such an ink jet method is used, a resin film can be uniformly formed at high speed. However, when the viscosity of the sealing agent is made low so as to make the sealing agent suitable for application by an ink jet method, there are problems such as the following: the organic EL display device is likely to be degassed or not stably ejected from the ink jet device, and the sealing is insufficient, which deteriorates the reliability of the obtained organic EL display device.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open No. 2000-223264
Patent document 2: japanese Kohyo publication No. 2005-522891
Patent document 3: japanese patent laid-open publication No. 2001-307873
Patent document 4: japanese patent laid-open No. 2008-149710
Disclosure of Invention
Problems to be solved by the invention
The purpose of the present invention is to provide a sealing agent for an organic EL display element, which can be easily applied by an ink jet method, has excellent low outgassing properties, and can provide an organic EL display element having excellent reliability.
Means for solving the problems
The present invention 1 is a sealing agent for an organic EL display element, which contains a polymerizable compound and a polymerization initiator, and which has a viscosity of 5 to 50 mPas at 25 ℃, a surface tension of 15 to 35mN/m at 25 ℃, and a volatility of 1% or less after 4 days at 25 ℃.
The present invention 2 is a sealant for an organic EL display element, which is used for application by an inkjet method, and which contains a polymerizable compound and a polymerization initiator, and has a volatility of 1% or less after 4 days at 25 ℃.
The present invention is described in detail below. The sealant for an organic EL display element of the present invention 1 is described as "the sealant for an organic EL display element of the present invention", in terms of the same matters as the sealant for an organic EL display element of the present invention 2.
The present inventors have further studied to set the volatility at 25 ℃ to a specific range for a sealant for an organic EL display element having excellent ink-jet coatability. As a result, the present inventors have found that a sealing agent for an organic EL display element, which can be easily applied by an ink jet method, has excellent low outgassing properties, and can provide an organic EL display element having excellent reliability, has been obtained, and have completed the present invention.
The sealing agent for an organic EL display element of the present invention can be applied by a non-heating type ink jet method or by a heating type ink jet method as an ink jet method.
In the present specification, the "non-heating type ink jet method" is a method of performing ink jet coating at a coating head temperature of less than 28 ℃, and the "heating type ink jet method" is a method of performing ink jet coating at a coating head temperature of 28 ℃ or higher.
In the above-described heating type ink jet method, an ink jet coating head equipped with a heating mechanism is used. By mounting the heating mechanism on the inkjet application head, viscosity and surface tension can be reduced when the sealant for the organic EL display element is discharged.
Examples of the inkjet application head having the heating mechanism include: KM1024 series manufactured by Konika Minneta, SG1024 series manufactured by Fujifilm Dimatix, and the like.
When the sealant for an organic EL display element of the present invention is used for coating by the above-described heating inkjet method, the heating temperature of the coating head is preferably in the range of 28 to 80 ℃. By setting the heating temperature of the coating head within this range, the viscosity of the sealant for an organic EL display element can be prevented from increasing with time, and the discharge stability is further improved.
The lower limit of the viscosity of the sealant for an organic EL display element of the present invention 1 is 5mPa · s, and the upper limit is 50mPa · s. When the viscosity is in this range, the coating can be favorably performed by an ink jet method.
In the present specification, the viscosity is a value measured at 25 ℃ and 100rpm using an E-type viscometer.
When the coating is performed by the non-heating inkjet method, the viscosity of the sealant for an organic EL display element of the present invention has a preferable lower limit of 5mPa · s and a preferable upper limit of 20mPa · s. When the viscosity is in this range, the coating can be favorably performed by a non-heating type ink jet method. When the coating is performed by the non-heating inkjet method, the viscosity of the sealant for an organic EL display element of the present invention has a more preferable lower limit of 8mPa · s, a more preferable upper limit of 16mPa · s, a further more preferable lower limit of 10mPa · s, and a further more preferable upper limit of 13mPa · s.
On the other hand, when the sealant is used for coating by the above-described heating inkjet method, the viscosity of the sealant for an organic EL display element of the present invention has a preferable lower limit of 10mPa · s and a preferable upper limit of 50mPa · s. When the viscosity is in this range, the coating can be favorably performed by a heating inkjet method. When the sealing agent for an organic EL display element of the present invention is used for coating by the above-described heating inkjet method, a more preferable lower limit of the viscosity of the sealing agent for an organic EL display element is 20mPa · s, and a more preferable upper limit thereof is 40mPa · s.
The lower limit of the surface tension of the sealing agent for an organic EL display element of the present invention 1 is 15mN/m, and the upper limit is 35 mN/m. When the surface tension is in this range, the coating can be favorably performed by an ink jet method. The surface tension preferably has a lower limit of 20mN/m, a preferred upper limit of 30mN/m, a more preferred lower limit of 22mN/m, and a more preferred upper limit of 28 mN/m.
The lower limit of the surface tension of the sealing agent for an organic EL display element of the present invention 2 is preferably 15mN/m, and the upper limit thereof is preferably 35 mN/m. When the surface tension is in this range, the coating can be favorably performed by an ink jet method. A more preferable lower limit to the surface tension is 20mN/m, a more preferable upper limit is 30mN/m, a further preferable lower limit is 22mN/m, and a further preferable upper limit is 28 mN/m.
The surface tension is a value measured by a dynamic wettability tester at 25 ℃ by the Wilhelmy method.
The upper limit of the volatilization rate of the sealant for an organic EL display element after 4 days at 25 ℃ is 1%. By setting the volatilization rate after 4 days at 25 ℃ to 1% or less, the obtained sealing agent for an organic EL display element is excellent in low outgassing property and the obtained organic EL display element is excellent in reliability. The upper limit of the volatilization rate after 4 days at 25 ℃ is preferably 0.5%, and the more preferred upper limit is 0.1%.
The above-mentioned volatility at 25 ℃ is most preferably 0%.
The above-mentioned volatilization rate after 4 days at 25 ℃ can be calculated as follows: a plastic brown container having a diameter of 33mm and a capacity of 50mL was charged with about 10g of the organic EL display element sealant, and the weight (A) of the container was measured, and the weight (B) of the container left in this state for 4 days without covering the container under a yellow lamp atmosphere at 25 ℃ under 1 atmosphere and 50% RH was calculated from the following equation.
Volatility at 25 ═ ((a) - (B)/(a)) × 100
The viscosity, the surface tension, and the volatility after 4 days at 25 ℃ can be set to the above ranges by selecting the species of the polymerizable compound, the polymerization initiator, and other components optionally contained, and adjusting the content ratio.
In particular, the above-mentioned volatility after 4 days at 25 ℃ can be set to the above-mentioned range by adjusting the boiling point and molecular weight of the polymerizable compound described later, or by using a hydrogen bonding component as the polymerizable compound, or the like.
Examples of the hydrogen-bonding component include a hydrogen-bonding component having-OH group and-NH group2A group, -NHR group (R represents an aromatic or aliphatic hydrocarbon or a derivative thereof), -COOH group, -CONH2And a polymerizable compound having a functional group such as a group-NHOH group. Examples of the hydrogen-bonding component include polymerizable compounds having a residue such as- -R- -O- -bond, - -NHCO- -bond, - -NH- -bond, - -CONHCO- -bond, or- -NH- -bond in the molecule. Among them, a polymerizable compound having at least one of an-OH group and an-R-O-bond is preferable.
The sealant for an organic EL display element of the present invention contains a polymerizable compound.
From the viewpoint of the volatility, it is preferable that the polymerizable compound contains 95 parts by weight or more of a compound having a boiling point of 160 ℃ or higher per 100 parts by weight of the entire polymerizable compound.
The compound having a boiling point of 160 ℃ or higher preferably has a boiling point of 170 ℃ or higher, more preferably 180 ℃ or higher.
More preferably, the polymerizable compound contains 98 parts by weight or more of the compound having the boiling point of 160 ℃ or higher, and most preferably consists only of the compound having the boiling point of 160 ℃ or higher, based on 100 parts by weight of the entire polymerizable compound.
In the present specification, the boiling point refers to a value measured under a condition of 101kPa using a method according to JIS K2233, or a value converted to 101kPa using a boiling point conversion chart or the like.
The lower limit of the molecular weight of the polymerizable compound is preferably 100, and the upper limit thereof is preferably 430. By setting the molecular weight of the polymerizable compound in this range, the obtained sealant for an organic EL display element has an excellent effect of achieving both coatability by an ink jet method and reliability of the obtained organic EL display element. A more preferable lower limit and a more preferable upper limit of the molecular weight of the polymerizable compound are 120 and 400, respectively.
In the present specification, the "molecular weight" of a compound having a definite molecular structure is a molecular weight determined from a structural formula, but a compound having a wide distribution of polymerization degrees and a compound having an indefinite modification site may be represented by a weight average molecular weight. In the present specification, the "weight average molecular weight" is a value determined based on polystyrene conversion by Gel Permeation Chromatography (GPC) measurement. Examples of the column used for measuring the weight average molecular weight in terms of polystyrene by GPC include Shodex LF-804 (manufactured by Showa Denko K.K.).
As the polymerizable compound, a cationic polymerizable compound or a radical polymerizable compound can be used. Among them, a cationic polymerizable compound is preferable.
Examples of the cation polymerizable compound include: epoxy compounds, oxetane compounds, vinyl ether compounds, and the like.
Examples of the epoxy compound include: bisphenol A type epoxy resin, bisphenol E type epoxy resin, bisphenol F type epoxy resin, bisphenol S type epoxy resin, bisphenol O type epoxy resin, 2' -diallylbisphenol A type epoxy resin, alicyclic epoxy resin, hydrogenated bisphenol type epoxy resin, propylene oxide-adduct bisphenol A type epoxy resin, resorcinol type epoxy resin, biphenyl type epoxy resin, thioether type epoxy resin, diphenyl ether type epoxy resin, dicyclopentadiene type epoxy resin, naphthalene type epoxy resin, phenol novolac type epoxy resin, o-cresol novolac type epoxy resin, dicyclopentadiene novolac type epoxy resin, biphenol novolac type epoxy resin, naphthol novolac type epoxy resin, glycidylamine type epoxy resin, alkyl polyol type epoxy resin, rubber modified type epoxy resin, glycidyl ester compound, epoxy modified organopolysiloxane, and the like. Among them, an alicyclic epoxy resin is preferable.
Examples of commercially available products of the alicyclic epoxy resin include: celloxide 2000, Celloxide 2021P, Celloxide 2081, Celloxide 3000, Celloxide 8000 (all made by Dailuo corporation); sansocizer EPS (manufactured by Nissi electronics Co., Ltd.), and the like.
Examples of the oxetane compound include: allyloxy oxetane, phenoxymethyl oxetane, 3-ethyl-3-hydroxymethyloxetane, 3-ethyl-3- (phenoxymethyl) oxetane, 3-ethyl-3- ((2-ethylhexyloxy) methyl) oxetane, 3-ethyl-3- ((3- (triethoxysilyl) propoxy) methyl) oxetane, 3-ethyl-3- (((3-ethyloxetan-3-yl) methoxy) methyl) oxetane, oxetanylsilsesquioxane, phenol novolac oxetane, 1, 4-bis (((3-ethyl-3-oxetanyl) methoxy) methyl) benzene, and the like.
Examples of the vinyl ether compound include: benzyl vinyl ether, cyclohexanedimethanol monovinyl ether, dicyclopentadiene vinyl ether, 1, 4-butanediol divinyl ether, cyclohexanedimethanol divinyl ether, diethylene glycol divinyl ether, triethylene glycol divinyl ether, dipropylene glycol divinyl ether, tripropylene glycol divinyl ether, and the like.
The radical polymerizable compound is preferably a (meth) acrylic compound.
The (meth) acrylic compound may be a monofunctional (meth) acrylic compound, may be a polyfunctional (meth) acrylic compound, or may be used in combination with the polyfunctional (meth) acrylic compound.
In the present specification, the "(meth) acrylic" refers to an acrylic or methacrylic, the "(meth) acrylic compound" refers to a compound having a (meth) acryloyl group, and the "(meth) acryloyl group" refers to an acryloyl group or a methacryloyl group.
The monofunctional (meth) acrylic compound preferably has a cationically polymerizable group from the viewpoint of low outgassing property and the like.
Examples of the cationically polymerizable group include: vinyl ether group, epoxy group, oxetane group, allyl ether group, vinyl group, hydroxyl group and the like.
Specific examples of the monofunctional (meth) acrylic compound include: 3, 4-epoxycyclohexylmethyl (meth) acrylate, glycidyl (meth) acrylate, 4-hydroxybutyl glycidyl (meth) acrylate, 2- (2-vinyloxyethoxy) ethyl (meth) acrylate, 3-ethyl-3- (meth) acryloyloxymethyloxetane, allyl (meth) acrylate, methoxydiethylene glycol (meth) acrylate, methoxytriethylene glycol (meth) acrylate, ethoxydiethylene glycol (meth) acrylate, ethoxytriethylene glycol (meth) acrylate, 2- (2-vinyloxyethoxy) ethyl (meth) acrylate, and the like. Among them, 3, 4-epoxycyclohexylmethyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate glycidyl ether, and 2- (2-ethyleneoxyethoxy) ethyl (meth) acrylate are preferable.
In the present specification, the "(meth) acrylate" refers to an acrylate or a methacrylate.
When the polymerizable compound contains the monofunctional (meth) acrylic compound, the preferable lower limit of the content of the monofunctional (meth) acrylic compound in 100 parts by weight of the polymerizable compound is 20 parts by weight, and the preferable upper limit is 80 parts by weight. When the content of the monofunctional (meth) acrylic compound is in this range, the obtained sealant for an organic EL display element is more excellent in low outgassing property and the like. A more preferable lower limit of the content of the monofunctional (meth) acrylic compound is 30 parts by weight, and a more preferable upper limit is 60 parts by weight.
From the viewpoint of ink-jet coatability and the like, the polyfunctional (meth) acrylic compound preferably has a polyoxyalkylene skeleton in the main chain.
The polyoxyalkylene skeleton is preferably a skeleton in which 2 to 6 oxyalkylene units are connected in series.
Examples of the oxyalkylene unit constituting the polyoxyalkylene skeleton include: oxyethylene units, oxypropylene units, and the like.
From the viewpoint of ink-jet coatability and the like, the polyfunctional (meth) acrylic compound is preferably a structure having a carbon chain with few branches, and more preferably a linear structure.
Specific examples of the polyfunctional (meth) acrylic compound include: diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, dipropylene glycol di (meth) acrylate, tripropylene glycol di (meth) acrylate, tetrapropylene glycol di (meth) acrylate, polytetramethylene glycol di (meth) acrylate, and the like. Among them, tetraethylene glycol di (meth) acrylate is preferable.
When the polymerizable compound contains the polyfunctional (meth) acrylic compound, the preferable lower limit of the content of the polyfunctional (meth) acrylic compound in 100 parts by weight of the polymerizable compound is 20 parts by weight, and the preferable upper limit is 80 parts by weight. When the content of the polyfunctional (meth) acrylic compound is in this range, the obtained sealant for an organic EL display element is more excellent in ink jet coatability and the like. A more preferable lower limit of the content of the above polyfunctional (meth) acrylic compound is 30 parts by weight, and a more preferable upper limit is 60 parts by weight.
When the monofunctional (meth) acrylic compound and the polyfunctional (meth) acrylic compound are used in combination, the content ratio of the monofunctional (meth) acrylic compound to the polyfunctional (meth) acrylic compound is preferably 7: 3 to 3: 7 in terms of a weight ratio. By setting the content ratio of the monofunctional (meth) acrylic compound to the polyfunctional (meth) acrylic compound in this range, the obtained sealing agent for an organic EL display element can be made more excellent in ink jet coatability and the like. The content ratio of the monofunctional (meth) acrylic compound to the polyfunctional (meth) acrylic compound is more preferably 6: 4 to 4: 6 in terms of a weight ratio.
The sealing agent for an organic EL display element of the present invention contains a polymerization initiator.
The polymerization initiator may be a photo cation polymerization initiator, a thermal cation polymerization initiator, a photo radical polymerization initiator, or a thermal radical polymerization initiator, depending on the kind of the polymerizable compound used.
The photo cation polymerization initiator is not particularly limited as long as it generates a protonic acid or a lewis acid by irradiation with light, and may be of an ionic photo acid generation type or a nonionic photo acid generation type.
Examples of the anionic moiety of the ionic photoacid generator type photocationic polymerization initiator include: BF (BF) generator4 -、PF6 -、SbF6 -Or (BX)4)-(wherein X represents a phenyl group substituted with at least 2 or more fluorine or trifluoromethyl groups), and the like.
Examples of the ionic photoacid generating type photocationic polymerization initiator include: aromatic sulfonium salts, aromatic iodonium salts, aromatic diazonium salts, aromatic ammonium salts, (2, 4-cyclopentadien-1-yl) ((1-methylethyl) benzene) -Fe salts having the above-mentioned anionic moiety, and the like.
Examples of the aromatic sulfonium salt include: bis (4- (diphenylsulfonium) phenyl) sulfide bishexafluorophosphate, bis (4- (diphenylsulfonium) phenyl) sulfide bishexafluoroantimonate, bis (4- (diphenylsulfonium) phenyl) sulfide bistetrafluoroborate, bis (4- (diphenylsulfonium) phenyl) sulfide tetrakis (pentafluorophenyl) borate, diphenyl-4- (phenylthio) phenyl sulfonium hexafluorophosphate, diphenyl-4- (phenylthio) phenyl sulfonium hexafluoroantimonate, diphenyl-4- (phenylthio) phenyl sulfonium tetrafluoroborate, diphenyl-4- (phenylthio) phenyl sulfonium tetrakis (pentafluorophenyl) borate, triphenylsulfonium hexafluorophosphate, triphenylsulfonium hexafluoroantimonate, triphenylsulfonium tetrafluoroborate, triphenylsulfonium tetrakis (pentafluorophenyl) borate, bis (4- (2-hydroxyethoxy)) phenyl sulfonium) phenyl) sulfide bishexafluorophosphate, Bis (4- (2-hydroxyethoxy)) phenylsulfone) phenyl) sulfide bishexafluoroantimonate, bis (4- (2-hydroxyethoxy)) phenylsulfone) phenyl) sulfide bistetrafluoroborate, bis (4- (2-hydroxyethoxy)) phenylsulfone) phenyl) sulfide tetrakis (pentafluorophenyl) borate, tris (4- (4-acetylphenyl) thiophenyl) sulfonium tetrakis (pentafluorophenyl) borate, and the like.
Examples of the aromatic iodonium salt include: diphenyliodonium hexafluorophosphate, diphenyliodonium hexafluoroantimonate, diphenyliodonium tetrafluoroborate, diphenyliodonium tetrakis (pentafluorophenyl) borate, bis (dodecylphenyl) iodonium hexafluorophosphate, bis (dodecylphenyl) iodonium hexafluoroantimonate, bis (dodecylphenyl) iodonium tetrafluoroborate, bis (dodecylphenyl) iodonium tetrakis (pentafluorophenyl) borate, 4-methylphenyl-4- (1-methylethyl) phenyliodonium hexafluorophosphate, 4-methylphenyl-4- (1-methylethyl) phenyliodonium hexafluoroantimonate, 4-methylphenyl-4- (1-methylethyl) phenyliodonium tetrafluoroborate, 4-methylphenyl-4- (1-methylethyl) phenyliodonium tetrakis (pentafluorophenyl) borate, etc.
Examples of the aromatic diazonium salt include: phenyldiazonium hexafluorophosphate, phenyldiazonium hexafluoroantimonate, phenyldiazonium tetrafluoroborate, phenyldiazonium tetrakis (pentafluorophenyl) borate, and the like.
Examples of the aromatic ammonium salt include: 1-benzyl-2-cyanopyridinium hexafluorophosphate, 1-benzyl-2-cyanopyridinium hexafluoroantimonate, 1-benzyl-2-cyanopyridinium tetrafluoroborate, 1-benzyl-2-cyanopyridinium tetrakis (pentafluorophenyl) borate, 1- (naphthylmethyl) -2-cyanopyridinium hexafluorophosphate, 1- (naphthylmethyl) -2-cyanopyridinium hexafluoroantimonate, 1- (naphthylmethyl) -2-cyanopyridinium tetrafluoroborate, 1- (naphthylmethyl) -2-cyanopyridinium tetrakis (pentafluorophenyl) borate, and the like.
Examples of the (2, 4-cyclopentadien-1-yl) ((1-methylethyl) benzene) -Fe salt include: (2, 4-cyclopentadien-1-yl) ((1-methylethyl) benzene) -Fe (II) hexafluorophosphate, (2, 4-cyclopentadien-1-yl) ((1-methylethyl) benzene) -Fe (II) hexafluoroantimonate, (2, 4-cyclopentadien-1-yl) ((1-methylethyl) benzene) -Fe (II) tetrafluoroborate, (2, 4-cyclopentadien-1-yl) ((1-methylethyl) benzene) -Fe (II) tetrakis (pentafluorophenyl) borate, and the like.
Examples of the nonionic photoacid-generating type photocationic polymerization initiator include: nitrobenzyl esters, sulfonic acid derivatives, phosphoric esters, phenol sulfonic acid esters, diazonaphthoquinones, N-hydroxyimide sulfonic acid esters, and the like.
Examples of commercially available photo-cationic polymerization initiators include: DTS-200 (manufactured by Midori Kagaku corporation); UVI6990 and UVI6974 (both manufactured by Union Carbide Co., Ltd.); SP-150 and SP-170 (both manufactured by ADEKA Co., Ltd.); FC-508, FC-512 (both 3M); IRGACURE261, IRGACURE290 (both manufactured by BASF corporation); PI2074 (Rhodia).
Examples of the thermal cationic polymerization initiator include: the anionic moiety being BF4 -、PF6 -、SbF6 -Or (BX)4)-(wherein X represents a phenyl group substituted with at least 2 or more fluorine groups or trifluoromethyl groups), sulfonium salts, phosphonium salts, ammonium salts, and the like. Among them, sulfonium salts and ammonium salts are preferable.
Examples of the sulfonium salt include: triphenylsulfonium tetrafluoroborate, triphenylsulfonium hexafluoroantimonate, and the like.
Examples of the phosphonium salt include: ethyltriphenylphosphonium hexafluoroantimonate, tetrabutylphosphonium hexafluoroantimonate and the like.
Examples of the ammonium salt include: dimethylphenyl (4-methoxybenzyl) ammonium hexafluorophosphate, dimethylphenyl (4-methoxybenzyl) ammonium hexafluoroantimonate, dimethylphenyl (4-methoxybenzyl) ammonium tetrakis (pentafluorophenyl) borate, dimethylphenyl (4-methylbenzyl) ammonium hexafluorophosphate, dimethylphenyl (4-methylbenzyl) ammonium hexafluoroantimonate, dimethylphenyl (4-methylbenzyl) ammonium hexafluorotetrakis (pentafluorophenyl) borate, methylphenyldibenzylammonium hexafluorophosphate, methylphenyldibenzylammonium hexafluoroantimonate, methylphenyldibenzylammonium tetrakis (pentafluorophenyl) borate, phenyltribenzylammonium tetrakis (pentafluorophenyl) borate, dimethylphenyl (3, 4-dimethylbenzyl) ammonium tetrakis (pentafluorophenyl) borate, N-dimethyl-N-benzylanilinium hexafluoroantimonate, N-dimethylbenzyl anilinium hexafluoroantimonate, N-dimethylbenzyl-N-methylbenzyl-ammonium hexafluoroantimonate, N-methylbenzyl-anilinium hexafluoroantimonate, N-methylbenzyl-ammonium hexafluoroantimonate, N-methyl-one, N-methyl-benzyl-ammonium hexafluoroantimonate, N-methyl-N-methyl-benzylammonium hexafluoroantimonate, N-benzyl-one, N-one, N-p-one, N-one, N-p-N-p-phenyl-N-p-N-p-N-p-N-p-N-p-N-p-N-p-N, N, N-diethyl-N-benzylanilinium tetrafluoroborate, N-dimethyl-N-benzylpyridinium hexafluoroantimonate, N-diethyl-N-benzylpyridinium trifluoromethanesulfonate and the like.
Examples of commercially available products of the thermal cationic polymerization initiator include: San-Aid SI-60, San-Aid SI-80, San-Aid SI-B3, San-Aid SI-B3A and San-Aid SI-B4 (all manufactured by Sanxin chemical industries Co., Ltd.); CXC1612 and CXC1821 (both King Industries, Ltd.), and the like.
Examples of the photo radical polymerization initiator include: benzophenone-based compounds, acetophenone-based compounds, acylphosphine oxide-based compounds, titanocene-based compounds, oxime ester-based compounds, benzoin ether-based compounds, benzil, thioxanthone-based compounds, and the like.
Examples of commercially available products of the photo radical polymerization initiator include: IRGACURE184, IRGACURE369, IRGACURE379, IRGACURE651, IRGACURE819, IRGACURE907, IRGACURE2959, IRGACURE OXE01, and Lucirin TPO (all manufactured by BASF corporation); benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether (all manufactured by Tokyo chemical industries Co., Ltd.), and the like.
Examples of the thermal radical polymerization initiator include thermal radical polymerization initiators formed from azo compounds, organic peroxides, and the like.
Examples of the azo compound include: 2, 2' -azobis (2, 4-dimethylvaleronitrile), azobisisobutyronitrile, and the like.
Examples of the organic peroxide include: benzoyl peroxide, ketone peroxides, peroxyketals, hydroperoxides, dialkyl peroxides, peroxyesters, diacyl peroxides, peroxydicarbonates, and the like.
Examples of commercially available products of the thermal radical polymerization initiator include: VPE-0201, VPE-0401, VPE-0601, VPS-0501, VPS-1001, and V-501 (all manufactured by Wako pure chemical industries, Ltd.).
The lower limit of the content of the polymerization initiator is preferably 0.01 part by weight and the upper limit thereof is preferably 10 parts by weight with respect to 100 parts by weight of the polymerizable compound. By setting the content of the polymerization initiator to 0.01 parts by weight or more, the obtained sealing agent for an organic EL display element is more excellent in curability. By setting the content of the polymerization initiator to 10 parts by weight or less, the curing reaction of the obtained sealant for an organic EL display element does not become excessively fast, the workability is more excellent, and the cured product can be made more uniform. The lower limit of the content of the polymerization initiator is more preferably 0.05 part by weight, and the upper limit is more preferably 5 parts by weight.
The sealant for an organic EL display element of the present invention may contain a sensitizer. The sensitizer has an effect of further improving the polymerization initiation efficiency of the polymerization initiator and further promoting the curing reaction of the sealant for an organic EL display element of the present invention.
Examples of the sensitizer include: thioxanthone compounds such as 2, 4-diethylthioxanthone, 2-dimethoxy-1, 2-diphenylethan-1-one, benzophenone, 2, 4-dichlorobenzophenone, methyl o-benzoylbenzoate, 4 '-bis (dimethylamino) benzophenone, 4-benzoyl-4' -methyldiphenyl sulfide, and the like.
The content of the sensitizer is preferably 0.01 part by weight at the lower limit and 3 parts by weight at the upper limit to 100 parts by weight of the polymerizable compound. The sensitizing effect can be further exhibited by setting the content of the sensitizing agent to 0.01 part by weight or more. By making the content of the sensitizer 3 parts by weight or less, absorption does not become excessively large, and light can be transmitted to a deep portion. A more preferable lower limit of the content of the above sensitizer is 0.1 part by weight, and a more preferable upper limit is 1 part by weight.
The sealing agent for an organic EL display element of the present invention may contain a silane coupling agent. The silane coupling agent has an effect of improving the adhesion of the sealant for an organic EL display element of the present invention to a substrate or the like.
Examples of the silane coupling agent include: 3-aminopropyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-isocyanatopropyltrimethoxysilane and the like. These silane compounds may be used alone, or two or more of them may be used in combination.
The lower limit of the content of the silane coupling agent is preferably 0.1 part by weight and the upper limit is preferably 10 parts by weight with respect to 100 parts by weight of the polymerizable compound. When the content of the silane coupling agent is in this range, bleeding of the excess silane coupling agent can be suppressed, and the effect of improving the adhesion is more excellent. A more preferable lower limit of the content of the silane coupling agent is 0.5 parts by weight, and a more preferable upper limit is 5 parts by weight.
The sealant for an organic EL display element of the present invention may further contain a surface modifier within a range that does not interfere with the object of the present invention. The organic EL display element sealing agent of the present invention can be provided with flatness of a coating film by containing the surface modifier.
Examples of the surface modifier include a surfactant and a leveling agent.
Examples of the surface modifier include silicone-based surface modifiers and fluorine-based surface modifiers.
Examples of commercially available products of the surface modifier include: BYK-340, BYK-345 (both BYK-Chemie Japan); surflon S-611 (manufactured by AGC Seimi Chemical Co., Ltd.), and the like.
The sealant for an organic EL display element of the present invention may contain a solvent for the purpose of adjusting viscosity or the like, but since there is a concern that problems such as deterioration of the organic light emitting material layer or degassing may occur due to the remaining solvent, it is preferable that no solvent is contained or the content of the solvent is 0.05 wt% or less.
The sealing agent for an organic EL display element of the present invention may contain various known additives such as a reinforcing agent, a softening agent, a plasticizer, a viscosity modifier, an ultraviolet absorber, and an antioxidant, as needed.
Examples of the method for producing the sealing agent for an organic EL display element of the present invention include a method of mixing a polymerizable compound, a polymerization initiator, and, if necessary, an additive such as a silane coupling agent, using a mixer such as a homomixer, a universal mixer, a planetary mixer, a kneader, or a three-roll mill.
The lower limit of the total light transmittance of the cured product of the sealing agent for an organic EL display element of the present invention at a wavelength of 380 to 800nm is preferably 80%. By setting the total light transmittance to 80% or more, the optical characteristics of the obtained organic EL display device become more excellent. A more preferred lower limit of the total light transmittance is 85%.
The total light transmittance can be measured using a spectrometer such as an AUTOMATIC HAZE matrix MODEL TC ═ III DPK (manufactured by tokyo electric color corporation).
Further, if the cured product used for the measurement of the total light transmittance is a photocurable sealing agent, the sealing agent can be irradiated with, for example, 3000mJ/cm by an LED lamp2365nm, or a thermosetting sealing agent, for example, by heating at 80 ℃ for 1 hour.
The sealant for an organic EL display element of the present invention preferably has a transmittance at 400nm of 85% or more in terms of an optical path length of 20 μm after irradiating a cured product with ultraviolet light for 100 hours. When the transmittance after 100 hours of ultraviolet irradiation is 85% or more, the transparency is increased, the loss of light emission is reduced, and the color reproducibility is further improved. The lower limit of the transmittance after 100 hours of the ultraviolet irradiation is more preferably 90%, and still more preferably 95%.
As the light source for irradiating the ultraviolet ray, a conventionally known light source such as a xenon lamp or a carbon arc lamp can be used.
Further, if the cured product used for the measurement of the transmittance after the irradiation with ultraviolet light for 100 hours is a photocurable sealant, the sealant can be irradiated with, for example, an LED lamp at 3000mJ/cm2365nm, or a thermosetting sealing agent, for example, by heating at 80 ℃ for 1 hour.
About the present hairThe sealant for organic EL display device preferably has a moisture permeability of 100g/m at a thickness of 100 μm measured by exposing a cured product to an atmosphere of 85 ℃ and 85% RH for 24 hours in accordance with JIS Z02082The following. By setting the above moisture permeability to 100g/m2As a result, the effect of preventing the occurrence of dark spots due to the moisture reaching the organic light-emitting material layer becomes more excellent, and the reliability of the resulting organic EL display element becomes more excellent.
Further, if the cured product used for the measurement of the moisture permeability is a photocurable sealing agent, the sealing agent can be irradiated with, for example, 3000mJ/cm by an LED lamp2365nm, or a thermosetting sealing agent, for example, by heating at 80 ℃ for 1 hour.
Further, in the sealant for an organic EL display element of the present invention, when the cured product is exposed to an environment of 85 ℃ and 85% RH for 24 hours, the water content of the cured product is preferably less than 0.5%. By setting the water content of the cured product to less than 0.5%, the effect of preventing the organic light-emitting material layer from being deteriorated by the water content in the cured product becomes more excellent, and the reliability of the obtained organic EL display element becomes more excellent. The upper limit of the water content of the cured product is more preferably 0.3%.
Examples of the method for measuring the water content include a method of obtaining the water content by the karl fischer method according to JIS K7251, and a method of obtaining the weight gain after water absorption according to JIS K7209-2.
Further, if the cured product used for the measurement of the water content is a photocurable sealing agent, the sealing agent can be irradiated with, for example, 3000mJ/cm using an LED lamp2And 365nm, and a thermosetting sealing agent, for example, by heating at 80 ℃ for 1 hour.
The sealant for an organic EL display element of the present invention 1 can be suitably used for coating by an ink jet method, and the sealant for an organic EL display element of the present invention 2 can be used for coating by an ink jet method.
Examples of the method for producing an organic EL display element using the sealant for an organic EL display element of the present invention include a method including the following steps: a step of applying the sealant for an organic EL display element of the present invention to a substrate by an inkjet method; and curing the applied sealing agent for the organic EL display element by light irradiation and/or heating.
In the step of applying the sealant for an organic EL display element of the present invention to a substrate, the sealant for an organic EL display element of the present invention may be applied to the entire surface of the substrate or may be applied to a part of the substrate. The shape of the sealing portion of the sealing agent for an organic EL display element of the present invention formed by coating is not particularly limited as long as it is a shape capable of protecting a laminate having an organic light emitting material layer from an external gas, and may be a shape that completely covers the laminate, may be a pattern that is closed at the peripheral portion of the laminate, or may be a pattern that is a shape in which a part of an opening is provided at the peripheral portion of the laminate.
When the sealing agent for an organic EL display element is cured by light irradiation, the sealing agent for an organic EL display element of the present invention can be cured by light irradiation with a wavelength of 300nm to 400nm and a cumulative light amount of 300 to 3000mJ/cm2Is well cured.
Examples of the light source for irradiating the sealing agent for an organic EL display element of the present invention with light include a low-pressure mercury lamp, a medium-pressure mercury lamp, a high-pressure mercury lamp, an ultrahigh-pressure mercury lamp, an excimer laser, a chemical lamp, a black light lamp, a microwave-excited mercury lamp, a metal halide lamp, a sodium lamp, a halogen lamp, a xenon lamp, an LED lamp, a fluorescent lamp, sunlight, and an electron beam irradiation device. These light sources may be used alone, or two or more kinds may be used in combination.
These light sources can be appropriately selected according to the absorption wavelength of the photo-radical polymerization initiator or photo-cation polymerization initiator.
Examples of the means for irradiating the sealing agent for an organic EL display element of the present invention with light include simultaneous irradiation with various light sources, sequential irradiation with a time difference, and combined irradiation of simultaneous irradiation and sequential irradiation, and any irradiation means can be used.
The cured product obtained by the step of curing the sealing agent for an organic EL display element by light irradiation and/or heating may be further covered with an inorganic material film.
As the inorganic material constituting the inorganic material film, conventionally known inorganic materials can be used, and examples thereof include silicon nitride (SiN)x) Silicon oxide (SiO)x) And the like. The inorganic material film may be composed of 1 layer, or a plurality of layers may be laminated. The laminate may be covered with the inorganic material film and the resin film formed from the sealant for an organic EL display element of the present invention alternately and repeatedly.
The method of manufacturing the organic EL display device may include the steps of: a step of bonding the substrate coated with the sealant for an organic EL display element of the present invention (hereinafter, also referred to as "one substrate") to the other substrate.
The substrate (hereinafter, also referred to as "one substrate") to which the sealant for an organic EL display element of the present invention is applied may be a substrate on which a laminate having an organic light-emitting material layer is formed, or may be a substrate on which the laminate is not formed.
When the one substrate is a substrate on which the laminate is not formed, the sealant for an organic EL display element of the present invention may be applied to the one substrate so that the laminate can be protected from external air when the other substrate is bonded. That is, the entire surface of the portion to be the position of the laminate may be coated when the other substrate is bonded, or the sealant portion may be formed in a pattern that closes the shape in which the portion to be the position of the laminate is completely housed when the other substrate is bonded.
The step of curing the sealant for organic EL display elements by light irradiation and/or heating may be performed before the step of bonding the one substrate to the other substrate, or may be performed after the step of bonding the one substrate to the other substrate.
In the case where the step of curing the sealant for organic EL display elements by light irradiation and/or heating is performed before the step of bonding the one substrate and the other substrate, the pot life of the sealant for organic EL display elements of the present invention is preferably 1 minute or more from the time of light irradiation and/or heating until the curing reaction proceeds and bonding is not possible. By setting the usable time to 1 minute or more, curing does not progress excessively before the one base material and the other base material are bonded, and a higher adhesive strength can be obtained.
In the step of bonding the one substrate and the other substrate, a method of bonding the one substrate and the other substrate is not particularly limited, and bonding is preferably performed in a reduced pressure atmosphere.
The lower limit of the degree of vacuum in the reduced pressure atmosphere is preferably 0.01kPa, and the upper limit is preferably 10 kPa. By setting the degree of vacuum in the reduced-pressure atmosphere to this range, it takes no longer time to reach a vacuum state from the viewpoint of airtightness of a vacuum apparatus and the capability of a vacuum pump, and bubbles in the sealant for an organic EL display element of the present invention when the one substrate and the other substrate are bonded can be removed more effectively.
Effects of the invention
According to the present invention, a sealing agent for an organic EL display element, which can be easily applied by an ink jet method, has excellent low outgassing properties, and can provide an organic EL display element having excellent reliability, can be provided.
Detailed Description
The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples.
Examples 1 to 6 and comparative examples 1 to 4
The respective materials were uniformly stirred and mixed at a stirring speed of 3000rpm using a homodispersion type stirring mixer (manufactured by Primix, "homo plastic L type") according to the mixing ratios described in table 1, thereby producing respective sealants for organic EL display elements of examples 1 to 6 and comparative examples 1 to 4.
The viscosities measured at 25 ℃ and 100rpm using an E-type VISCOMETER (manufactured by eastern industries, Ltd. "VISCOMETER TV-22") and the surface tensions measured at 25 ℃ by a dynamic wettability tester (manufactured by RHESCA, manufactured by "WET-6100") for the respective sealants for organic EL display elements obtained in examples and comparative examples are shown in table 1.
Further, a plastic brown container having a diameter of 33mm and a capacity of 50mL was charged with about 10g of each of the organic EL display element sealants obtained in examples and comparative examples, and the weight (A) was measured, and the weight (B) of the container left in this state for 4 days without being covered with a yellow lamp atmosphere at 25 ℃, 1 atm and 50% RH was measured, and the volatilization rate after 4 days at 25 ℃ was calculated from the above formula. The results are shown in Table 1.
< evaluation >
The following evaluations were performed on each of the organic EL display element sealants obtained in the examples and comparative examples. The results are shown in Table 1.
In each evaluation of the inkjet ejection property, ejection stability, wetting and diffusing property, and reliability of the organic EL display element, IJH-30 (manufactured by IJT) was used as an inkjet application head, and inkjet application was performed without heating (head temperature 25 ℃).
(1) Ink-jet coatability
(1-1) ink jet ejectability
The sealants for organic EL display elements obtained in examples and comparative examples were applied to alkali-free glass (asahi glass, "AN 100") which had been alkali-cleaned, using AN inkjet discharge apparatus (manufactured by microdot, "NanoPrinter 500") at a drop volume of 30 picoliters. The case where the liquid droplets were normally ejected from the ink jet nozzles and landed on the substrate was marked as "o", and the case where the liquid droplets were not normally ejected was marked as "x", and the ink ejection performance was evaluated.
(1-2) discharge stability
The respective sealants for organic EL display elements obtained in examples 1 to 6 and comparative examples 3 and 4 were applied to alkali-free glass (manufactured by asahi glass, "AN 100") after alkali cleaning in a liquid drop amount of 30 picoliters by using AN ink jet apparatus (manufactured by microsoft corporation, "NanoPrinter 500") at a speed of 5 m/sec and at a pitch of 500 μm. Next, after leaving at 25 ℃ for 10 minutes, the glass substrate was coated again under the same conditions as described above, and the droplets on the glass substrate after the 2 nd coating were observed.
The ejection stability was evaluated by assuming that the number of droplets that could not be applied was 0, assuming that the number of droplets that could not be applied was less than 20 was "Δ", and assuming that the number of droplets that could not be applied was 20 or more was "x".
(1-3) wetting diffusion Property
The respective sealants for organic EL display elements obtained in examples 1 to 6 and comparative examples 3 and 4 were applied to alkali-free glass (manufactured by asahi glass, "ANl 00") after alkali cleaning in a liquid drop amount of 30 picoliters by using an ink jet device (manufactured by microsoft corporation, "NanoPrinter 500") at a speed of 5 m/sec and at a pitch of 500 μm. The droplet diameter of the alkali-free glass 10 minutes after the application was measured, and the wet diffusibility was evaluated by setting the droplet diameter to 150 μm or more as "o", the droplet diameter to 50 μm or more and less than 150 μm as "Δ", and the droplet diameter to less than 50 μm as "x".
(2) Low degassing property
The outgas generated during heating of the cured products of the sealants for organic EL display elements obtained in examples 1 to 6 and comparative examples 3 and 4 was measured by a gas chromatograph (manufactured by JEOL, "JMS-Q1050 GC") based on the headspace method. Each organic EL display element was coated with 100mg of the sealant to a thickness of 300 μm by an applicator. Next, 3000mJ/cm was irradiated with an LED lamp2Curing the sealant with 365nm ultraviolet rays, filling the cured sealant into a vial for headspace, sealing the vial, heating at 100 ℃ for 30 minutes, and measuring the generated gas by headspace method.
The gas generated was evaluated for low outgassing, and the gas was evaluated for less than 300ppm as "O", 300ppm or more and less than 500ppm as "Δ", and 500ppm or more as "X".
(3) Reliability of organic EL display element
(3-1) production of substrate having laminate comprising organic light-emitting Material layer
Is coated on a glass substrate (25 mm in length, 25mm in width and 0.7mm in thickness)
The thickness of (3) is such that an ITO electrode is formed into a film, and the film is used as a substrate. The substrate was ultrasonically cleaned with acetone, an aqueous alkali solution, ion-exchanged water, and isopropyl alcohol for 15 minutes, then cleaned with boiling isopropyl alcohol for 10 minutes, and further pretreated with a UV-ozone cleaner (NL-UV 253, manufactured by japan laser electronics).
Next, the substrate was fixed to a substrate holder of a vacuum deposition apparatus, 200mg of N, N '-bis (1-naphthyl) -N, N' -diphenylbenzidine (. alpha. -NPD) was charged into a bisque-fired crucible, and tris (8-quinolinolato) aluminum (Alq) was charged into another bisque-fired crucible3)200mg, the pressure in the vacuum chamber was reduced to 1X 10-4Pa is up to. Thereafter, the crucible containing the alpha-NPD is heated to cause the-NPD to increase
Is deposited on a substrate at a deposition rate to form a film with a thickness of
The hole transport layer of (1). Then, will be charged with Alq3Is heated in a crucible to
The deposition rate of (2) is set to a film thickness
The organic light emitting material layer of (1). Thereafter, the substrate on which the hole transport layer and the organic light-emitting material layer were formed was transferred to another vacuum deposition apparatus, and 200mg of lithium fluoride was charged into a tungsten resistance heating boat in the vacuum deposition apparatus, and 1.0g of an aluminum wire was charged into another tungsten boat. Thereafter, willThe pressure in the evaporator of the vacuum evaporation device is reduced to 2 x 10-4Pa, and fluorinating lithium with
Is deposited at a deposition rate of
Then, aluminum is added
At a rate of film formation of
The inside of the evaporator was returned to normal pressure by nitrogen gas, and the substrate on which the laminate having 10mm × 10mm organic light-emitting material layers was disposed was taken out.
(3-2) covering based on inorganic Material film A
A mask having an opening of 13mm × 13mm was provided so as to cover the entire laminate of the obtained substrate on which the laminate was disposed, and the inorganic material film a was formed by a plasma CVD method.
The plasma CVD method was performed under the following conditions: SiH is used as the raw material gas4Gas and nitrogen gas, the respective flow rates being SiH4The gas was 10sccm, the nitrogen gas was 200sccm, the RF power was 10W (frequency: 2.45GHz), the temperature in the chamber was 100 ℃, and the pressure in the chamber was 0.9 Torr.
The thickness of the inorganic material film a formed was about 1 μm.
(3-3) formation of resin protective film
The obtained substrate was coated with the sealant pattern for organic EL display elements obtained in examples 1 to 6 and comparative examples 3 and 4 using an inkjet discharge apparatus ("NanoPrinter 500", manufactured by microdot corporation).
Thereafter, 3000mJ/cm was irradiated with an LED lamp2And 365nm ultraviolet rays, curing the sealant for the organic EL display element, thereby forming a resin protective film.
(3-4) covering based on inorganic Material film B
After the resin protective film was formed, a mask having an opening of 12mm × 12mm was provided so as to cover the entire resin protective film, and the inorganic material film B was formed by a plasma CVD method, thereby obtaining an organic EL display element.
The plasma CVD method is performed under the same conditions as the above "(3-2) covering with the inorganic material film a".
The thickness of the inorganic material film B formed was about 1 μm.
(3-5) light-emitting State of organic EL display element
The organic EL display device thus obtained was exposed to an environment of 85 ℃ and 85% humidity for 100 hours, and then a voltage of 3V was applied to visually observe the light emission state (presence or absence of dark spots and extinction around pixels) of the organic EL display device. The case where there was no dark spot, the periphery was dulled, and the light was uniformly emitted was defined as "o"; "Δ" represents a case where the brightness is slightly decreased although there is no dark spot and peripheral extinction; the display performance of the organic EL display element was evaluated by setting the visible dark spots and the peripheral extinction as "x".
[ Table 1]
In order to confirm the effect of the viscosity of the organic EL display element sealant on the ink-jet coatability in the non-heating type ink-jet method and the heating type ink-jet method, the following experiment was performed. The results are shown in Table 2.
(Experimental example 1)
The respective materials were uniformly stirred and mixed at a stirring speed of 3000rpm using a homodispersion type stirring mixer (manufactured by Primix, "homo plastic L type") in accordance with the compounding ratios described in table 2, and then subjected to a dehydration step of exposing the mixture to an environment of 50 ℃ and 0.1MPa for 30 minutes, thereby producing a sealant for an organic EL display element.
The obtained sealant for organic EL display elements was measured for viscosity at 25 ℃ and 100rpm using an E-type VISCOMETER ("VISCOMETER TV-22" manufactured by eastern industries) and for surface tension at 25 ℃ using a dynamic wettability tester ("WET-6100" manufactured by RHESCA).
Then, the weight (A) of the obtained organic EL display element sealant was measured by placing 10g in a brown plastic container having a diameter of 33mm and a capacity of 50mL, and the weight (B) of the container left in this state for 4 days without covering the container under a yellow lamp atmosphere of 25 ℃, 1 atm and 50% RH was measured, and the volatilization rate after 4 days at 25 ℃ was calculated from the above formula.
The obtained organic EL display element sealant was applied to alkali-free glass (manufactured by asahi glass, "AN 100") which had been alkali-cleaned, in a drop amount of 30 picoliters using AN ink jet apparatus ("NanoPrinter 500", manufactured by microsoft corporation). The ink ejection performance was evaluated by assuming that the case where the liquid droplets were normally ejected from the ink ejection nozzles and landed on the substrate was "o" and the case where the liquid droplets were not normally ejected was "x". The IJH-30 (manufactured by IJT) was used as an inkjet coating head, and inkjet coating was performed without heating (head temperature 25 ℃).
(Experimental example 2)
The same sealant for organic EL display elements as the sealant produced in experimental example 1 was prepared.
Ink jet ejection properties were evaluated in the same manner as in example 1, except that IJH-30 (manufactured by IJT) was used as an ink jet application head and ink jet application was performed while heating (head temperature 60 ℃).
[ Table 2]
Industrial applicability
According to the present invention, a sealing agent for an organic EL display element, which can be easily applied by an ink jet method, has excellent low outgassing properties, and can provide an organic EL display element having excellent reliability, can be provided.
Claims (5)
1. A sealing agent for an organic EL display element, characterized by containing a polymerizable compound and a polymerization initiator,
the polymerizable compound is at least 1 selected from the group consisting of an epoxy compound, an oxetane compound and a (meth) acrylic compound, and the polymerization initiator is at least 1 selected from the group consisting of a photo cation polymerization initiator, a thermal cation polymerization initiator, a photo radical polymerization initiator and a thermal radical polymerization initiator,
the content of the polymerization initiator is 0.01 to 10 parts by weight based on 100 parts by weight of the polymerizable compound,
the sealant for an organic EL display element has a viscosity of 5 to 40 mPas at 25 ℃, a surface tension of 15 to 30mN/m at 25 ℃, and a volatility of 1% or less after 4 days at 25 ℃.
2. The sealing agent for an organic EL display element according to claim 1, wherein the polymerizable compound contains 95 parts by weight or more of a compound having a boiling point of 160 ℃ or higher per 100 parts by weight of the entire polymerizable compound.
3. The sealant for an organic EL display element according to claim 1 or 2, wherein when the polymerizable compound contains a monofunctional (meth) acrylic compound, the content of the monofunctional (meth) acrylic compound is 20 parts by weight or more and 80 parts by weight or less based on 100 parts by weight of the polymerizable compound.
4. The sealant for an organic EL display element according to claim 1 or 2, which contains no solvent or a solvent content of 0.05 wt% or less.
5. A use of a sealant for an organic EL display element, which contains a polymerizable compound and a polymerization initiator, in coating by an ink-jet method,
the polymerizable compound is at least 1 selected from the group consisting of an epoxy compound, an oxetane compound and a (meth) acrylic compound, and the polymerization initiator is at least 1 selected from the group consisting of a photo cation polymerization initiator, a thermal cation polymerization initiator, a photo radical polymerization initiator and a thermal radical polymerization initiator,
the content of the polymerization initiator is 0.01 to 10 parts by weight based on 100 parts by weight of the polymerizable compound,
the sealant for an organic EL display element has a viscosity of 5 to 40 mPas at 25 ℃, a surface tension of 15 to 30mN/m at 25 ℃, and a volatility of 1% or less after 4 days at 25 ℃.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016205486 | 2016-10-19 | ||
| JP2016-205486 | 2016-10-19 | ||
| PCT/JP2017/037654 WO2018074505A1 (en) | 2016-10-19 | 2017-10-18 | Sealant for organic el display elements |
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| Publication Number | Publication Date |
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| CN109076661A CN109076661A (en) | 2018-12-21 |
| CN109076661B true CN109076661B (en) | 2021-11-12 |
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| CN201780023757.4A Active CN109076661B (en) | 2016-10-19 | 2017-10-18 | Sealing agent for organic EL display element |
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| Country | Link |
|---|---|
| JP (3) | JP6404494B2 (en) |
| KR (2) | KR102392860B1 (en) |
| CN (1) | CN109076661B (en) |
| TW (1) | TW201819450A (en) |
| WO (1) | WO2018074505A1 (en) |
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| JP7479842B2 (en) * | 2018-04-20 | 2024-05-09 | 積水化学工業株式会社 | Sealant for organic EL display devices |
| JP6730549B2 (en) * | 2018-08-10 | 2020-07-29 | 三井化学株式会社 | Sealant |
| JP7457644B2 (en) * | 2018-12-18 | 2024-03-28 | 積水化学工業株式会社 | Curable resin composition, cured product, and organic EL display element |
| WO2020129794A1 (en) * | 2018-12-18 | 2020-06-25 | 積水化学工業株式会社 | Curable resin composition, cured product and organic el display element |
| CN111785845A (en) * | 2019-04-04 | 2020-10-16 | 上海和辉光电有限公司 | Thin film packaging material, manufacturing method thereof, thin film packaging structure and electronic device |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2018195593A (en) | 2018-12-06 |
| JP2022027781A (en) | 2022-02-14 |
| KR20220061267A (en) | 2022-05-12 |
| CN109076661A (en) | 2018-12-21 |
| WO2018074505A1 (en) | 2018-04-26 |
| JPWO2018074505A1 (en) | 2018-10-25 |
| JP6985228B2 (en) | 2021-12-22 |
| JP6404494B2 (en) | 2018-10-10 |
| TW201819450A (en) | 2018-06-01 |
| KR20190064531A (en) | 2019-06-10 |
| KR102392860B1 (en) | 2022-04-29 |
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