WO2014092002A1 - 硬化性樹脂組成物、およびそれを用いた積層体とその製造方法 - Google Patents
硬化性樹脂組成物、およびそれを用いた積層体とその製造方法 Download PDFInfo
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- WO2014092002A1 WO2014092002A1 PCT/JP2013/082740 JP2013082740W WO2014092002A1 WO 2014092002 A1 WO2014092002 A1 WO 2014092002A1 JP 2013082740 W JP2013082740 W JP 2013082740W WO 2014092002 A1 WO2014092002 A1 WO 2014092002A1
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- WIPO (PCT)
- Prior art keywords
- resin composition
- curable resin
- group
- monomer
- laminate
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 44
- 150000003077 polyols Chemical class 0.000 claims abstract description 107
- 239000000178 monomer Substances 0.000 claims abstract description 79
- 229920005862 polyol Polymers 0.000 claims abstract description 63
- 150000001875 compounds Chemical class 0.000 claims abstract description 50
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims abstract description 50
- 239000003999 initiator Substances 0.000 claims abstract description 38
- 239000005056 polyisocyanate Substances 0.000 claims abstract description 36
- 229920001228 polyisocyanate Polymers 0.000 claims abstract description 36
- 125000002947 alkylene group Chemical group 0.000 claims abstract description 21
- 239000012948 isocyanate Substances 0.000 claims abstract description 17
- 150000002513 isocyanates Chemical class 0.000 claims abstract description 17
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims abstract description 15
- 150000003673 urethanes Chemical class 0.000 claims abstract description 10
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000000758 substrate Substances 0.000 claims description 98
- 239000011347 resin Substances 0.000 claims description 60
- 229920005989 resin Polymers 0.000 claims description 60
- 239000012298 atmosphere Substances 0.000 claims description 56
- 125000004432 carbon atom Chemical group C* 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 20
- 239000002243 precursor Substances 0.000 claims description 19
- 230000001681 protective effect Effects 0.000 claims description 17
- 125000000524 functional group Chemical group 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 11
- 238000003475 lamination Methods 0.000 claims description 9
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 9
- 125000000217 alkyl group Chemical group 0.000 claims description 7
- 239000001257 hydrogen Substances 0.000 claims description 6
- 229910052739 hydrogen Inorganic materials 0.000 claims description 6
- 125000002768 hydroxyalkyl group Chemical group 0.000 claims description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 5
- 125000005702 oxyalkylene group Chemical group 0.000 claims description 5
- 125000001931 aliphatic group Chemical group 0.000 claims description 4
- 125000002723 alicyclic group Chemical group 0.000 claims description 3
- -1 acryloyloxy group Chemical group 0.000 description 65
- 239000010410 layer Substances 0.000 description 56
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- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 description 18
- 239000003566 sealing material Substances 0.000 description 18
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 14
- 239000011521 glass Substances 0.000 description 14
- 239000004973 liquid crystal related substance Substances 0.000 description 13
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 12
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- 239000003963 antioxidant agent Substances 0.000 description 9
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- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 description 9
- 229920001451 polypropylene glycol Polymers 0.000 description 8
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 7
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 7
- 230000002349 favourable effect Effects 0.000 description 7
- 239000003112 inhibitor Substances 0.000 description 7
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- 125000006353 oxyethylene group Chemical group 0.000 description 7
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- 239000011701 zinc Substances 0.000 description 7
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 6
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- 230000003078 antioxidant effect Effects 0.000 description 6
- 238000009835 boiling Methods 0.000 description 6
- PBOSTUDLECTMNL-UHFFFAOYSA-N lauryl acrylate Chemical compound CCCCCCCCCCCCOC(=O)C=C PBOSTUDLECTMNL-UHFFFAOYSA-N 0.000 description 6
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- 238000003860 storage Methods 0.000 description 6
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 5
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 description 5
- UKLDJPRMSDWDSL-UHFFFAOYSA-L [dibutyl(dodecanoyloxy)stannyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)O[Sn](CCCC)(CCCC)OC(=O)CCCCCCCCCCC UKLDJPRMSDWDSL-UHFFFAOYSA-L 0.000 description 5
- 125000005442 diisocyanate group Chemical group 0.000 description 5
- 239000004611 light stabiliser Substances 0.000 description 5
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- 239000006097 ultraviolet radiation absorber Substances 0.000 description 5
- 239000012956 1-hydroxycyclohexylphenyl-ketone Substances 0.000 description 4
- OMIGHNLMNHATMP-UHFFFAOYSA-N 2-hydroxyethyl prop-2-enoate Chemical compound OCCOC(=O)C=C OMIGHNLMNHATMP-UHFFFAOYSA-N 0.000 description 4
- NDWUBGAGUCISDV-UHFFFAOYSA-N 4-hydroxybutyl prop-2-enoate Chemical compound OCCCCOC(=O)C=C NDWUBGAGUCISDV-UHFFFAOYSA-N 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 238000002835 absorbance Methods 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 4
- MQDJYUACMFCOFT-UHFFFAOYSA-N bis[2-(1-hydroxycyclohexyl)phenyl]methanone Chemical compound C=1C=CC=C(C(=O)C=2C(=CC=CC=2)C2(O)CCCCC2)C=1C1(O)CCCCC1 MQDJYUACMFCOFT-UHFFFAOYSA-N 0.000 description 4
- 125000004122 cyclic group Chemical group 0.000 description 4
- 230000009257 reactivity Effects 0.000 description 4
- CXMXRPHRNRROMY-UHFFFAOYSA-N sebacic acid Chemical compound OC(=O)CCCCCCCCC(O)=O CXMXRPHRNRROMY-UHFFFAOYSA-N 0.000 description 4
- KZNICNPSHKQLFF-UHFFFAOYSA-N succinimide Chemical compound O=C1CCC(=O)N1 KZNICNPSHKQLFF-UHFFFAOYSA-N 0.000 description 4
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 3
- GWZMWHWAWHPNHN-UHFFFAOYSA-N 2-hydroxypropyl prop-2-enoate Chemical compound CC(O)COC(=O)C=C GWZMWHWAWHPNHN-UHFFFAOYSA-N 0.000 description 3
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 3
- DKGAVHZHDRPRBM-UHFFFAOYSA-N Tert-Butanol Chemical compound CC(C)(C)O DKGAVHZHDRPRBM-UHFFFAOYSA-N 0.000 description 3
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 125000003118 aryl group Chemical group 0.000 description 3
- RWCCWEUUXYIKHB-UHFFFAOYSA-N benzophenone Chemical compound C=1C=CC=CC=1C(=O)C1=CC=CC=C1 RWCCWEUUXYIKHB-UHFFFAOYSA-N 0.000 description 3
- 239000012965 benzophenone Substances 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 3
- UHESRSKEBRADOO-UHFFFAOYSA-N ethyl carbamate;prop-2-enoic acid Chemical compound OC(=O)C=C.CCOC(N)=O UHESRSKEBRADOO-UHFFFAOYSA-N 0.000 description 3
- 230000004927 fusion Effects 0.000 description 3
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- JYEUMXHLPRZUAT-UHFFFAOYSA-N 1,2,3-triazine Chemical compound C1=CN=NN=C1 JYEUMXHLPRZUAT-UHFFFAOYSA-N 0.000 description 2
- JZODKRWQWUWGCD-UHFFFAOYSA-N 2,5-di-tert-butylbenzene-1,4-diol Chemical compound CC(C)(C)C1=CC(O)=C(C(C)(C)C)C=C1O JZODKRWQWUWGCD-UHFFFAOYSA-N 0.000 description 2
- LEVFXWNQQSSNAC-UHFFFAOYSA-N 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-hexoxyphenol Chemical compound OC1=CC(OCCCCCC)=CC=C1C1=NC(C=2C=CC=CC=2)=NC(C=2C=CC=CC=2)=N1 LEVFXWNQQSSNAC-UHFFFAOYSA-N 0.000 description 2
- IEVADDDOVGMCSI-UHFFFAOYSA-N 2-hydroxybutyl 2-methylprop-2-enoate Chemical compound CCC(O)COC(=O)C(C)=C IEVADDDOVGMCSI-UHFFFAOYSA-N 0.000 description 2
- 125000000954 2-hydroxyethyl group Chemical group [H]C([*])([H])C([H])([H])O[H] 0.000 description 2
- GAODDBNJCKQQDY-UHFFFAOYSA-N 2-methyl-4,6-bis(octylsulfanylmethyl)phenol Chemical compound CCCCCCCCSCC1=CC(C)=C(O)C(CSCCCCCCCC)=C1 GAODDBNJCKQQDY-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 compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- SNRUBQQJIBEYMU-UHFFFAOYSA-N Dodecane Natural products CCCCCCCCCCCC SNRUBQQJIBEYMU-UHFFFAOYSA-N 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- 239000005057 Hexamethylene diisocyanate Substances 0.000 description 2
- QIGBRXMKCJKVMJ-UHFFFAOYSA-N Hydroquinone Chemical compound OC1=CC=C(O)C=C1 QIGBRXMKCJKVMJ-UHFFFAOYSA-N 0.000 description 2
- 229920000305 Nylon 6,10 Polymers 0.000 description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 2
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- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical compound ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 description 2
- 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 2
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- 150000001339 alkali metal compounds Chemical class 0.000 description 2
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- 150000001412 amines Chemical class 0.000 description 2
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 description 2
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 description 2
- 239000012964 benzotriazole Substances 0.000 description 2
- 125000003236 benzoyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C(*)=O 0.000 description 2
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- 150000002009 diols Chemical class 0.000 description 2
- WNAHIZMDSQCWRP-UHFFFAOYSA-N dodecane-1-thiol Chemical compound CCCCCCCCCCCCS WNAHIZMDSQCWRP-UHFFFAOYSA-N 0.000 description 2
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- 125000003438 dodecyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 2
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- FSAJWMJJORKPKS-UHFFFAOYSA-N octadecyl prop-2-enoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)C=C FSAJWMJJORKPKS-UHFFFAOYSA-N 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- RZFODFPMOHAYIR-UHFFFAOYSA-N oxepan-2-one;prop-2-enoic acid Chemical compound OC(=O)C=C.O=C1CCCCCO1 RZFODFPMOHAYIR-UHFFFAOYSA-N 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
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- XOALFFJGWSCQEO-UHFFFAOYSA-N tridecyl prop-2-enoate Chemical compound CCCCCCCCCCCCCOC(=O)C=C XOALFFJGWSCQEO-UHFFFAOYSA-N 0.000 description 2
- HVLLSGMXQDNUAL-UHFFFAOYSA-N triphenyl phosphite Chemical compound C=1C=CC=CC=1OP(OC=1C=CC=CC=1)OC1=CC=CC=C1 HVLLSGMXQDNUAL-UHFFFAOYSA-N 0.000 description 2
- NWPIOULNZLJZHU-UHFFFAOYSA-N (1,2,2,6,6-pentamethylpiperidin-4-yl) 2-methylprop-2-enoate Chemical compound CN1C(C)(C)CC(OC(=O)C(C)=C)CC1(C)C NWPIOULNZLJZHU-UHFFFAOYSA-N 0.000 description 1
- RBACIKXCRWGCBB-UHFFFAOYSA-N 1,2-Epoxybutane Chemical compound CCC1CO1 RBACIKXCRWGCBB-UHFFFAOYSA-N 0.000 description 1
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- DKEGCUDAFWNSSO-UHFFFAOYSA-N 1,8-dibromooctane Chemical compound BrCCCCCCCCBr DKEGCUDAFWNSSO-UHFFFAOYSA-N 0.000 description 1
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- MIYFFZILCMZNRY-UHFFFAOYSA-N 1-hydroxypentyl prop-2-enoate Chemical compound CCCCC(O)OC(=O)C=C MIYFFZILCMZNRY-UHFFFAOYSA-N 0.000 description 1
- STFXXRRQKFUYEU-UHFFFAOYSA-N 16-methylheptadecyl prop-2-enoate Chemical compound CC(C)CCCCCCCCCCCCCCCOC(=O)C=C STFXXRRQKFUYEU-UHFFFAOYSA-N 0.000 description 1
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- ZXDDPOHVAMWLBH-UHFFFAOYSA-N 2,4-Dihydroxybenzophenone Chemical compound OC1=CC(O)=CC=C1C(=O)C1=CC=CC=C1 ZXDDPOHVAMWLBH-UHFFFAOYSA-N 0.000 description 1
- JFGVTUJBHHZRAB-UHFFFAOYSA-N 2,6-Di-tert-butyl-1,4-benzenediol Chemical compound CC(C)(C)C1=CC(O)=CC(C(C)(C)C)=C1O JFGVTUJBHHZRAB-UHFFFAOYSA-N 0.000 description 1
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- KMRIWYPVRWEWRG-UHFFFAOYSA-N 2-(6-oxobenzo[c][2,1]benzoxaphosphinin-6-yl)benzene-1,4-diol Chemical compound OC1=CC=C(O)C(P2(=O)C3=CC=CC=C3C3=CC=CC=C3O2)=C1 KMRIWYPVRWEWRG-UHFFFAOYSA-N 0.000 description 1
- ZMWRRFHBXARRRT-UHFFFAOYSA-N 2-(benzotriazol-2-yl)-4,6-bis(2-methylbutan-2-yl)phenol Chemical compound CCC(C)(C)C1=CC(C(C)(C)CC)=CC(N2N=C3C=CC=CC3=N2)=C1O ZMWRRFHBXARRRT-UHFFFAOYSA-N 0.000 description 1
- OLFNXLXEGXRUOI-UHFFFAOYSA-N 2-(benzotriazol-2-yl)-4,6-bis(2-phenylpropan-2-yl)phenol Chemical compound C=1C(N2N=C3C=CC=CC3=N2)=C(O)C(C(C)(C)C=2C=CC=CC=2)=CC=1C(C)(C)C1=CC=CC=C1 OLFNXLXEGXRUOI-UHFFFAOYSA-N 0.000 description 1
- IYAZLDLPUNDVAG-UHFFFAOYSA-N 2-(benzotriazol-2-yl)-4-(2,4,4-trimethylpentan-2-yl)phenol Chemical compound CC(C)(C)CC(C)(C)C1=CC=C(O)C(N2N=C3C=CC=CC3=N2)=C1 IYAZLDLPUNDVAG-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
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Images
Classifications
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- C08F290/00—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups
- C08F290/02—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups on to polymers modified by introduction of unsaturated end groups
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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- B32B37/0007—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding involving treatment or provisions in order to avoid deformation or air inclusion, e.g. to improve surface quality
- B32B37/003—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding involving treatment or provisions in order to avoid deformation or air inclusion, e.g. to improve surface quality to avoid air inclusion
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Definitions
- the present invention relates to a curable resin composition, a laminate using the same, and a method for producing the same.
- an image display device an image display device in which a protective plate is laminated on a display device via a bonding resin layer having excellent transparency is known.
- a sealing material is disposed on the peripheral edge of the transparent substrate, a layer of a curable resin composition containing a photocurable resin is formed on the inside of the sealing material, and another transparent substrate is placed under the reduced pressure on the curable resin.
- a method in which a curable resin composition is hermetically sealed between transparent substrates overlaid on a layer of the composition, and then cured by irradiating the curable resin composition with light in an atmospheric pressure atmosphere Patent Document 1.
- curable resin composition a curable resin composition containing an unsaturated urethane oligomer having a photocurable unsaturated group such as an acryloyloxy group or a methacryloyloxy group is known (Patent Documents 1 and 2).
- the curing shrinkage rate of the curable resin composition is reduced and a more flexible cured resin layer is formed. It is required to reduce the color unevenness.
- Patent Document 1 when the method described in Patent Document 1 is applied to the attachment of a protective plate to a display device, whether or not the obtained transparent cured resin layer can sufficiently meet the recent demand for color unevenness is disclosed in Patent Document There is no description in 1.
- the flexible cured resin layer can be formed by blending a chain transfer agent with the curable resin composition, adjusting the molecular weight, and curing. However, when a chain transfer agent is used, the curing rate is slowed and productivity is lowered.
- the present invention provides a curable resin composition capable of forming a cured product that has a high curing rate, is flexible, and suppresses uneven color, and a laminate using the curable resin composition and a method for producing the same.
- Unsaturated urethane oligomer (I) obtained by reacting the following prepolymer (A) with the following compound (B), and a monomer represented by the following formula (II-1): At least one selected from the group consisting of a monomer represented by (II-2), a monomer represented by the following formula (II-3), and a monomer represented by the following formula (II-4): A curable resin composition comprising a seed monomer (II).
- Prepolymer (A) An isocyanate group-terminated urethane prepolymer obtained by reacting the following polyol (A1) and polyisocyanate (A2) under the condition of an isocyanate index of more than 100 and 160 or less.
- Polyol (A1) Polyoxyalkylene polyol having a hydroxyl value of 3 to 13 mgKOH / g, obtained by reacting an alkylene oxide (a12) having 3 or more carbon atoms with an initiator (a11) having an average active hydrogen number of 2 to 4 .
- Compound (B) A compound having the following curable functional group and hydroxyl group.
- Curable functional group a group represented by CH 2 ⁇ C (R 1 ) C (O) O— (wherein R 1 is a hydrogen atom or a methyl group).
- R 2 is a hydroxyalkyl group having 2 to 8 carbon atoms having one or two hydroxyl groups.
- m is an integer of 1 to 3.
- Q 1 is an oxyalkylene group having 2 to 4 carbon atoms, and n is an integer of 2 to 8.
- the polyisocyanate (A2) is a polyisocyanate selected from the group consisting of an alicyclic polyisocyanate, an aliphatic polyisocyanate, and a modified polyisocyanate obtained by modifying them.
- Curable resin composition [3] The curable resin composition according to [1] or [2], wherein the compound (B) is a compound represented by the following formula (B1).
- R 3 is an alkyl group having 8 to 22 carbon atoms.
- the curable resin composition is used for forming the cured resin layer in the manufacture of a laminate having a pair of substrates and a cured resin layer sandwiched between the pair of substrates.
- one of the pair of substrates is a display device and the other is a transparent protective plate, and the cured resin layer is in contact with the viewing side of the display device.
- the curable resin composition of the present invention can form a cured product having a high curing rate and being flexible and having suppressed color unevenness.
- the laminate of the present invention has a cured product that is flexible and has suppressed color unevenness, and has high productivity. According to the method for producing a laminate of the present invention, it is possible to produce a laminate having a cured resin layer that is flexible and suppresses color unevenness with high productivity.
- an image display device having good physical properties such as optical characteristics can be obtained.
- an acryloyloxy group and a methacryloyloxy group are collectively referred to as a (meth) acryloyloxy group.
- acrylate and methacrylate are collectively referred to as (meth) acrylate.
- Acrylic acid and methacrylic acid are collectively referred to as (meth) acrylic acid.
- the curable functional group that is, a group represented by CH 2 ⁇ C (R 1 ) C (O) O— (wherein R 1 is a hydrogen atom or a methyl group) is a (meth) acryloyloxy group. It is.
- the compound represented by the formula (B1) is referred to as a compound (B1), and the same applies to compounds and monomers represented by other formulas.
- “transparent” means a state in which the other surface side can be visually recognized from one surface side in the whole or a part of the cured product or substrate of the curable resin composition. Even when the visible light transmittance is low due to absorption, reflection, or optical phase change of a part of the light incident on the cured product or the substrate, the state where the other surface side can be seen from one surface side is “transparent” "include.
- the laminated portion of the polarizing plate, the cured product, and the protective plate can be said to be a transparent laminate.
- one of the substrates is a polarizing plate
- the other substrate is a protective plate
- both correspond to a transparent substrate.
- the substrate is an opaque substrate.
- the laminate of the present invention is not limited to a transparent laminate, and the substrate may be an opaque substrate.
- at least one of the pair of substrates is a transparent substrate, and more preferably both of the pair of substrates are transparent substrates.
- the curable resin composition of the present invention is a curable resin composition containing an unsaturated urethane oligomer (I) (hereinafter referred to as “oligomer (I)”) and a monomer (II).
- oligomer (I) unsaturated urethane oligomer
- II monomer
- the curable resin composition of the present invention can be suitably used in a method for producing a transparent laminate by curing a curable resin composition narrowed between a pair of transparent substrates.
- the oligomer (I) is a reaction product obtained by reacting a prepolymer (A) which is an isocyanate group-terminated urethane prepolymer described later with the compound (B).
- the oligomer (I) has a (meth) acryloyloxy group as described later.
- the prepolymer (A) is a urethane prepolymer obtained by reacting a later-described polyol (A1) with a polyisocyanate (A2) under conditions where the isocyanate index is more than 100 and 160 or less.
- the prepolymer (A) has an isocyanate group at the terminal.
- the finally obtained oligomer (I) is flexible and suppresses uneven color at a sufficient curing rate. It becomes an unsaturated urethane oligomer that forms the cured product.
- the lower limit of the isocyanate index is preferably 103, and more preferably 105, since the strength of the cured product becomes good.
- the upper limit value of the isocyanate index is preferably 150 and more preferably 130 because a cured product with more flexible and suppressed color unevenness can be obtained.
- the isocyanate index is a value obtained by dividing the number of moles of isocyanate group of the polyisocyanate (A2) by the number of moles of hydroxyl group of the polyol (A1) and multiplying by 100.
- a prepolymer (A) may be used individually by 1 type, and may use 2 or more types together.
- the polyol (A1) is a polyoxyalkylene having a hydroxyl value of 3 to 13 mgKOH / g, obtained by reacting an alkylene oxide (a12) having 3 or more carbon atoms with an initiator (a11) having an average active hydrogen number of 2 to 4. It is a polyol.
- the polyol (A1) has a polyoxyalkylene chain composed of an oxyalkylene group having 3 or more carbon atoms.
- the polyol (A1) is preferably a polyoxyalkylene polyol obtained by reacting an initiator (a11) with an alkylene oxide (a12) in the presence of a catalyst (a13).
- a polyol (A1) may be used individually by 1 type, and may use 2 or more types together.
- the unsaturation degree (USV) of the polyol (A1) is preferably 0.05 or less.
- a polyoxyalkylene polyol having a low hydroxyl value is obtained by reacting propylene oxide (hereinafter referred to as “PO”) with an initiator using a general-purpose alkali metal compound catalyst (potassium hydroxide, etc.)
- PO propylene oxide
- a general-purpose alkali metal compound catalyst potassium hydroxide, etc.
- a cured product containing the oligomer (I) obtained using a polyoxyalkylene polyol having a high degree of unsaturation may have insufficient mechanical properties.
- the catalyst (a13) examples include diethyl zinc, iron chloride, metal porphyrin, double metal cyanide complex, cesium compound, alkali (earth) metal compound and the like. Among these, an alkali metal compound catalyst or a double metal cyanide complex is preferable. In order to produce a polyol (A1) having a low hydroxyl value and a low degree of unsaturation, a double metal cyanide complex is particularly preferred as the catalyst (a13).
- a complex mainly composed of zinc hexacyanocobaltate is preferable, and an ether complex or an alcohol complex of zinc hexacyanocobaltate, or both are particularly preferable.
- the ether complex or alcohol complex of zinc hexacyanocobaltate include those described in JP-B-46-27250.
- the ether that forms a complex with zinc hexacyanocobaltate ethylene glycol dimethyl ether (glyme) and diethylene glycol dimethyl ether are preferable, and glyme is particularly preferable from the viewpoint of ease of handling during production of the complex.
- the alcohol that forms a complex with zinc hexacyanocobaltate tert-butanol and tert-butyl cellosolve are preferable.
- the average active hydrogen number of the initiator (a11) is 2 to 4, and preferably 2 to 3.
- the active hydrogen means an active hydrogen atom with which an alkylene oxide can react, such as a hydrogen atom of a hydroxyl group or a hydrogen atom of an amino group.
- a hydrogen atom of a hydroxyl group is preferable.
- the initiator (a11) is preferably a polyhydroxy compound having an average number of hydroxyl groups of 2 to 4, and more preferably a polyhydroxy compound having an average number of hydroxyl groups of 2 to 3. If the average number of hydroxyl groups of the initiator (a11) is within this range, the resulting polyol (A1) also has the same number of average hydroxyl groups.
- the initiator (a11) examples include ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, neopentyl glycol, 1,4-butanediol, 1,6-hexanediol, glycerin, trimerolpropane, pentaerythritol, and the like.
- examples thereof include polyoxyalkylene polyols having a lower molecular weight than polyol (A1) obtained by reacting alkylene oxide.
- the molecular weight of the initiator (a11) is preferably 500-1500.
- the initiator (a11) is preferably a polyoxypropylene polyol having a molecular weight of 500 to 1500 obtained by reacting PO with a divalent to tetravalent polyhydric alcohol.
- An initiator (a11) may be used individually by 1 type, and may use 2 or more types together.
- the alkylene oxide (a12) is an alkylene oxide having 3 or more carbon atoms.
- Examples of the alkylene oxide having 3 or more carbon atoms include PO, 1,2-butylene oxide, 2,3-butylene oxide, styrene oxide and the like. Of these, PO is preferable as the alkylene oxide (a12).
- PO is preferable as the alkylene oxide (a12).
- Alkylene oxide (a12) may be used individually by 1 type, and may use 2 or more types together.
- the alkylene oxide (a12) is an alkylene oxide other than ethylene oxide having 2 carbon atoms (hereinafter referred to as “EO”).
- EO alkylene oxide other than ethylene oxide having 2 carbon atoms
- the average number of hydroxyl groups per molecule of the polyol (A1) is 2 to 4, and preferably 2 to 3. If the average number of hydroxyl groups per molecule of the polyol (A1) is 2 to 4, an oligomer (I) having an average number of (meth) acryloyloxy groups per molecule of 2 to 4 can be easily obtained.
- the initiator (a11) is one kind, the average number of hydroxyl groups per molecule of the polyol (A1) is the number of active hydrogens per molecule of the initiator (a11), and the initiator (a11) has two kinds. In the case of a mixture, it is an average value of the number of active hydrogens per molecule of the initiator (a11).
- the hydroxyl value of the polyol (A1) is 3 to 13 mgKOH / g, preferably 4 to 12 mgKOH / g, and more preferably 5.5 to 10 mgKOH / g. If the hydroxyl value of a polyol (A1) is more than a lower limit, the intensity
- the hydroxyl value of the polyol (A1) is not more than the upper limit value, a cured product that is flexible and suppresses color unevenness is formed at a high curing rate.
- the hydroxyl value of the polyol (A1) is a value measured according to JIS K1557-1 (2007 edition).
- the polyol (A1) having a hydroxyl value within the above range is used, a cured product of a curable resin composition that is flexible and suppressed in color unevenness can be obtained, and therefore the reactivity does not decrease with a chain transfer agent or the like.
- polyisocyanate (A2) examples include alicyclic polyisocyanates, aliphatic polyisocyanates having two or more average isocyanate groups per molecule, and modified polyisocyanates obtained by modifying these.
- the aliphatic polyisocyanate may contain a polyisocyanate having an aromatic ring.
- An aromatic polyisocyanate having an isocyanate group bonded to an aromatic ring is preferably not used because it is highly likely to cause yellowing of the cured resin.
- the average number of isocyanate groups per molecule of the polyisocyanate (A2) is preferably 2 to 4, particularly preferably 2. That is, as the polyisocyanate (A2), diisocyanate is preferable.
- Polyisocyanate (A2) may be used individually by 1 type, and may use 2 or more types together.
- polyisocyanate (A2) examples include diisocyanates such as isophorone diisocyanate, dicyclohexylmethane diisocyanate, hexamethylene diisocyanate, and xylene diisocyanate, prepolymer modified products, nurate modified products, urea modified products, and carbodiimide modified products of the diisocyanate. It is done. Of these, isophorone diisocyanate and hexamethylene diisocyanate are preferable.
- the compound (B) is a compound having the following curable functional group, that is, a (meth) acryloyloxy group and a hydroxyl group.
- Curable functional group a group represented by CH 2 ⁇ C (R 1 ) C (O) O— (wherein R 1 is a hydrogen atom or a methyl group).
- the compound (B) may have one curable functional group in one molecule, or may have two or more. In addition, the compound (B) may have one hydroxyl group in one molecule, or may have two or more.
- diisocyanate is used as the polyisocyanate (A2), in order to produce a prepolymer (A) having an average of 2 to 4 curable functional groups, one curable functional group and one hydroxyl group are contained in one molecule.
- the compound (B) which has one is preferable.
- the following compound (B1) is preferable.
- R 4 is a hydrogen atom or a methyl group
- Q 2 is an alkylene group having 2 to 12 carbon atoms.
- R 4 in the formula (B1) is preferably a hydrogen atom in order to obtain a highly reactive oligomer (I). That is, it is preferable that the curable functional group which a compound (B1) has is an acryloyloxy group.
- Q 2 in the formula (B1) is preferably an alkylene group having 2 to 8 carbon atoms, and more preferably an alkylene group having 2 to 4 carbon atoms.
- the compound (B) is more preferably a hydroxyalkyl acrylate having a hydroxyalkyl group having 2 to 4 carbon atoms, among the compounds (B1).
- Examples of the monomer (B) include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 4-hydroxy Examples include butyl (meth) acrylate, pentanediol mono (meth) acrylate, and hexanediol mono (meth) acrylate. Of these, 2-hydroxyethyl (meth) acrylate and 2-hydroxypropyl (meth) acrylate are preferable, and 2-hydroxyethyl acrylate and 2-hydroxypropyl acrylate are particularly preferable.
- a compound (B) may be used individually by 1 type, and may use 2 or more types together.
- the oligomer (I) is a reaction product of the prepolymer (A) and the compound (B).
- the oligomer (I) may have both an acryloyloxy group and a methacryloyloxy group, but preferably has only either an acryloyloxy group or a methacryloyloxy group, and has only an acryloyloxy group. More preferably. Since the oligomer (I) has a high molecular weight, the reactivity of the (meth) acryloyloxy group, that is, the curability tends to be low.
- an oligomer (I) having an acryloyloxy group that is more reactive than a methacryloyloxy group is used.
- the difference in curability is reduced, and a uniform cured product is easily obtained.
- the average number of (meth) acryloyloxy groups per molecule of the oligomer (I) is preferably 2 to 4, and more preferably 2 to 3. If the number of the (meth) acryloyloxy groups is not less than the lower limit, the cured product is hardly deformed even when exposed to high temperatures. If the number of the (meth) acryloyloxy groups is not more than the upper limit value, the cured product is difficult to become brittle.
- the number of the (meth) acryloyloxy groups in the oligomer (I) can be adjusted by the number of hydroxyl groups of the polyol (A1), the number of isocyanate groups of the polyisocyanate (A2), the number of curable functional groups and the number of hydroxyl groups of the compound (B).
- the number of isocyanate groups of the polyisocyanate (A2) is 2
- the number of (meth) acryloyloxy groups and the number of hydroxyl groups in the compound (B) is 1, the average per molecule of the oligomer (I)
- the number of (meth) acryloyloxy groups is almost the same as the average number of hydroxyl groups per molecule of polyol (A1).
- the urethanization catalyst include cobalt naphthenate, zinc naphthenate, zinc 2-ethylhexanoate, dibutyltin dilaurate, tin 2-ethylhexanoate, triethylamine, 1,4-diabicyclo [2.2.2] octane, and the like. It is done.
- the reaction temperature is preferably 30 to 90 ° C.
- the polymerization inhibitor examples include hydroquinone, hydroquinone monomethyl ether, 2,5-di-tert-butylhydroquinone, 2,6-di-tert-butylhydroquinone, o-nitrotoluene and the like.
- the amount of the polymerization inhibitor used is preferably 50 to 5000 ppm by mass with respect to the total mass of the compound (B) used in the reaction.
- the ratio of the prepolymer (A) and the compound (B) used in the reaction is such that the molar ratio of the isocyanate group of the prepolymer (A) to the hydroxyl group of the compound (B) is 1: 1 to 1: 1.5.
- the ratio is preferably 1: 1 to 1: 1.02.
- the reaction temperature is preferably 30 to 90 ° C.
- the curable resin composition of the present invention includes the following monomer (II-1), the following monomer (II-2), the following monomer (II-3), and the following It contains at least one monomer (II) selected from the group consisting of monomers (II-4).
- the curable resin composition contains the monomer (II)
- the hydrophilicity of the obtained cured product is increased. Therefore, when the cured resin layer of the laminate is formed of the curable resin composition of the present invention, and at least one of the base materials is a glass plate, the affinity between the cured resin layer and the surface of the glass plate is improved. Increased adhesion.
- cured material also increases because curable resin composition contains monomer (II).
- R 2 is a C 2-8 hydroxyalkyl group having 1 or 2 hydroxyl groups.
- m is an integer of 1 to 3.
- Q 1 is an oxyalkylene group having 2 to 4 carbon atoms, and n is an integer of 2 to 8.
- the number of hydroxyl groups in the hydroxyalkyl group of R 2 in the formula (II-1) is preferably 1 because of excellent flexibility.
- the number of carbon atoms in the hydroxyalkyl group of R 2 is preferably 2 to 6 because of excellent adhesion, flexibility, and low volatility.
- monomer (II-1) 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 3-hydroxypropyl acrylate, 2-hydroxybutyl acrylate, 4-hydroxybutyl acrylate, pentanediol monoacrylate, hexanediol monoacrylate , 8-hydroxyoctyl acrylate and the like.
- the monomer (II-1) 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, and 4-hydroxybutyl acrylate are preferable.
- m is preferably 1 to 3 because of excellent adhesion and low viscosity.
- the monomer (II-2) include caprolactone acrylate, and examples of the commercially available product include caprolactone acrylate (trade name SR-495) manufactured by Sartomer.
- Q 1 is preferably an oxyethylene group.
- n is preferably 2 to 5 because it has excellent adhesion and low viscosity.
- Examples of the monomer (II-3) include polypropylene glycol monoacrylate, polyethylene glycol monoacrylate, poly (oxypropylene / oxyethylene) glycol monoacrylate, and the like. Among these, as the monomer (II-3), polypropylene glycol monoacrylate is preferable.
- Monomer (II) may be used individually by 1 type, and may use 2 or more types together.
- the monomer (II) Since the monomer (II) has an acryloyloxy group as a curable functional group, the monomer (II) not only has high reactivity, but also cures using a polyol (A1) that does not contain an oxyethylene group as a raw material for the oligomer (I) The transparency of the object becomes good. This is presumably because the compatibility between the oligomer (I) and the monomer (II) is good.
- the curable resin composition of the present invention preferably contains the following monomer (III) in addition to the oligomer (I) and the monomer (II).
- the curable resin composition contains the monomer (III)
- the elastic modulus of the obtained cured product is lowered, and the tear resistance is improved.
- R 3 is an alkyl group having 8 to 22 carbon atoms.
- the carbon number of the alkyl group represented by R 3 in the formula (III) is 8 to 22, and preferably 10 to 18. If carbon number is 8 or more, it can suppress that the volatility of a monomer becomes high too much or that the glass transition temperature of hardened
- Monomer (III) may be used individually by 1 type, and may use 2 or more types together.
- the monomer (III) Since the monomer (III) has an acryloyloxy group as a curable functional group, the monomer (III) not only has high reactivity, but also cures using a polyol (A1) that does not contain an oxyethylene group as a raw material of the oligomer (I) The transparency of the object becomes good. This is presumably because the compatibility between the oligomer (I) and the monomer (III) is good.
- the curable resin composition of the present invention preferably contains a photopolymerization initiator (IV). That is, the curable resin composition of the present invention is preferably a photocurable resin composition in which a curing reaction proceeds by light irradiation.
- the photopolymerization initiator (IV) those which are excited by irradiation with visible light or ultraviolet light (wavelength of 300 to 400 nm) and are activated to accelerate the curing reaction are preferable.
- Specific examples include benzoin ether photopolymerization initiators, ⁇ -hydroxyalkylphenone photopolymerization initiators, and acylphosphine oxide photopolymerization initiators.
- photopolymerization initiator (IV) examples include benzophenone, 4-chlorobenzophenone, 4,4′-dimethoxybenzophenone, 4,4′-diaminobenzophenone, acetophenone, 3-methylacetophenone, benzoyl, benzoin isobutyl ether, benzoin Isopropyl ether, benzoin ethyl ether, anthraquinone, 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1- [4- (2-hydroxyethoxy) -phenyl] -2- Examples thereof include hydroxy-2-methyl-1-propan-1-one, bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide, and the like.
- 1-hydroxycyclohexyl phenyl ketone 1- [4- (2-hydroxyethoxy) -phenyl] -2-hydroxy-2-methyl-1-propan-1-one, bis (2,4,6-trimethyl) Acyl phosphine oxide photopolymerization initiators such as benzoyl) -phenyl phosphine oxide are preferred, and 1-hydroxycyclohexyl phenyl ketone, bis (2, 4,6-trimethylbenzoyl) -phenylphosphine oxide is particularly preferred.
- the photopolymerization initiator (IV) one type may be used alone, or two or more types may be used in combination.
- the curable resin composition of the present invention is within the range not impairing the effects of the present invention, except for the oligomer (I), the monomer (II), the monomer (III) and the photopolymerization initiator (IV).
- Component (V) may be included.
- the curable resin composition of the present invention may contain an oligomer other than the oligomer (I) for the purpose of adjusting the physical properties of the obtained cured product.
- oligomers include urethane (meth) acrylate oligomers obtained using polyols other than polyol (A1), poly (meth) acrylates obtained by reacting polyoxyalkylene polyols with (meth) acrylic acid, and polyester polyols. Examples include poly (meth) acrylates obtained by reacting (meth) acrylic acid.
- a monomer other than monomer (II) and monomer (III) may be included.
- the other monomer a compound having 1 to 6 (meth) acryloyloxy groups is preferable, and the number of (meth) acryloyloxy groups is 1 to 2 in that a flexible cured product is easily obtained. Certain compounds are more preferred.
- the low viscosity monomer whose viscosity in 25 degreeC is 1 Pa * s or less is preferable. Monomers with low viscosity are sometimes referred to as reactive diluents.
- the viscosity is a value measured using an E-type viscometer (manufactured by Toki Sangyo Co., Ltd., RE-85U).
- the other monomer include poly (meth) acrylate obtained by reacting polyhydric alcohol with (meth) acrylic acid.
- a compound having a methacryloyloxy group can be used as long as transparency is not impaired, but a compound having an acryloyloxy group is preferable.
- additives may be added to the curable resin composition depending on the application.
- examples of the additive include an antioxidant, an ultraviolet absorber, a light stabilizer, a pigment, a dye, metal oxide fine particles, and a filler.
- the ultraviolet absorber is used for preventing the photo-degradation of the curable resin composition and improving the weather resistance, for example, ultraviolet rays such as benzotriazole, triazine, benzophenone, and benzoate. An absorbent etc. are mentioned.
- benzotriazole ultraviolet absorber examples include 2- (2-hydroxy-5-methylphenyl) benzotriazole, 2,4-bis (1-methyl-1-phenylethyl) -6- (2H-benzotriazole- 2-yl) phenol, 2- (5-chloro-2-benzotriazolyl) -6-tert-butyl-p-cresol, 2- (2-hydroxy-5-tert-octylphenyl) benzotriazole, (2 , 2-methylenebis [6- (2H-benzotriazol-2-yl) -4- (1,1,3,3, -tetramethylbutyl) phenol], 2- (2H-benzotriazol-2-yl)- 4,6-bis (1,1-dimethyl-propyl) -phenol and the like.
- Examples of the triazine-based ultraviolet absorber include 2- [4,6-diphenyl-1,3,5-triazin-2-yl] -5- (hexyloxy) phenol, 2- [4,6-bis (2 , 4-dimethylphenyl) -1,3,5-triazin-2-yl] -5- (isooctyloxy) -phenol.
- Examples of the benzophenone ultraviolet absorber include 2-hydroxy-4-n-octyloxybenzophenone, (2,4-dihydroxyphenyl) phenyl-methanone, and the like.
- Examples of the benzoate ultraviolet classifier include 2- [4,6-diphenyl-1,3,5-triazin-2-yl] -5- (hexyloxy) phenol.
- the said light stabilizer is used in order to prevent the photodegradation of curable resin composition and to improve a weather resistance, for example, a hindered amine type light stabilizer is mentioned.
- a hindered amine type light stabilizer examples include N, N′-bis (2,2,6,6-tetramethyl-4-piperidinyl) -N ′-[4- [butyl (2,2,6,6).
- the antioxidant is used to prevent oxidation of the curable resin composition and improve weather resistance and heat resistance, and examples thereof include phenol-based and phosphorus-based antioxidants.
- phenolic antioxidants include pentaerythritol tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], 2,2′-thiodiethylbis [3- (3,5 -Di-tert-butyl-4-hydroxyphenyl) propionate], stearyl 3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate, N, N ′-(1,6-hexanediyl) Bis [3,5-bis (1,1-dimethylethyl) -4-hydroxybenzenepropanamide], octyl-3,5-di-tert-butyl-4-hydroxy-hydrocarbinic acid, 2,4,6- Tris (3 ′, 5′-di-tert
- phosphorus antioxidants include triphenyl phosphite, diphenylisodecyl phosphite, phenyl diisodecyl phosphite, 4,4′-butylidene-bis (3-methyl-6-t-butylphenylditridecyl) phosphite , Cyclic neopentanetetrayl bis (nonylphenyl) phosphite, cyclic neopentanetetrayl bis (dinonylphenyl) phosphite, cyclic neopentanetetrayl tris (nonylphenyl) phosphite, cyclic neopentanetetrayl Tris (dinonylphenyl) phosphite, 10- (2,5-dihydroxyphenyl) -10H-9-oxa-10-phosphaphenanthrene-10-oxide, di
- the curable resin composition may contain a solvent as a coating composition in order to improve the coating property. In this case, after applying the coating composition, the solvent is removed to obtain a curable resin composition, which is cured.
- a solvent when using the curable resin composition of this invention for manufacture of the below-mentioned laminated body, since it is not preferable to have a volatile component, it is preferable not to use a solvent.
- the curable resin composition of the present invention is a curable resin composition containing an oligomer (I), a monomer (II), and a monomer (III), particularly when used in the production of a laminate described later. It is preferable. Moreover, it is more preferable that the curable resin composition of the present invention further contains a photopolymerization initiator (IV). In addition, the composition which consists only of oligomer (I) and monomer (II) may be sufficient as the curable resin composition of this invention.
- the content of the oligomer (I) in the curable resin composition (100% by mass) of the present invention is preferably 20 to 75% by mass, and more preferably 40 to 60% by mass. If content of oligomer (I) is more than a lower limit, even if hardened
- the content of the monomer (II) in the curable resin composition (100% by mass) of the present invention is preferably 25 to 65% by mass, and more preferably 35 to 50% by mass.
- content of the monomer (II) is at least the lower limit value, the adhesion between the cured resin layer and the substrate and the tear resistance are good when the laminate is produced. If content of monomer (II) is below an upper limit, it will be excellent in transparency of hardened material.
- the content of monomer (III) in the curable resin composition (100% by mass) of the present invention is 3 to 50 masses. % Is preferable, and 5 to 25% by mass is more preferable. If content of monomer (III) is more than a lower limit, the softness
- the content of the photopolymerization initiator (IV) in the curable resin composition of the present invention is 100 parts by mass of the oligomer (I). Is preferably 0.01 to 10 parts by mass, and more preferably 0.1 to 2.5 parts by mass.
- content of this other component (V) in the curable resin composition (100 mass%) of this invention is 10 mass. % Or less is preferable and 5 mass% or less is more preferable.
- the curable resin composition in the case of producing a laminate by a production method using a reduced pressure lamination method does not contain a monomer having a boiling point of 150 ° C. or less under an atmospheric pressure atmosphere.
- alkyl (meth) acrylates having a smaller number of carbon atoms in the alkyl group than monomer (III) often have a low boiling point, and preferably do not contain the alkyl (meth) acrylate.
- the viscosity V 40 at 40 ° C. of the curable resin composition of the present invention is preferably 50 Pa ⁇ s or less, and more preferably 5 Pa ⁇ s or less.
- the viscosity V 25 at 25 ° C. of the curable resin composition of the present invention is preferably 0.05 Pa ⁇ s or more, and more preferably 0.20 Pa ⁇ s or more. If the viscosity V 40 is more than the upper limit, sufficient fluidity can not be obtained, it bubbles hardly occurs in the curable resin composition.
- the viscosity V 25 is equal to or higher than the lower limit, it is not necessary to use a large amount of a low molecular weight monomer in order to reduce the viscosity, so that the physical properties of the cured product are hardly lowered.
- the viscosity is a value measured using an E-type viscometer (manufactured by Toki Sangyo Co., Ltd., RE-85U). However, when the viscosity of the curable resin composition is 100 Pa ⁇ s or less, 1 ° 34 ′ ⁇ R24 is used as the rotor, and when the viscosity exceeds 100 Pa ⁇ s, 3 ° ⁇ R9.7 is used as the rotor. And
- the curable resin composition of the present invention contains the oligomer (I), it can form a cured product that is flexible and suppresses color unevenness at a high curing rate. Moreover, since a polyol (A1) does not have an oxyethylene group, the softness
- the laminate of the present invention is a laminate having a pair of substrates and a cured resin layer sandwiched between the pair of substrates, and the cured resin layer is cured by the curable resin composition of the present invention. It is the layer of the cured resin formed.
- the substrate in the laminate of the present invention may be a transparent substrate or an opaque substrate.
- the substrate may be a multilayer structure or a single layer structure.
- At least one of the pair of substrates is preferably a transparent substrate. More preferably, both of the pair of substrates are transparent substrates.
- substrate needs to be a transparent substrate, and light is irradiated to a curable resin composition through a transparent substrate.
- both of the pair of substrates may be opaque substrates.
- the display device When one of the pair of substrates is a display device such as a liquid crystal display device or an organic EL display device, the display device is generally opaque as a whole.
- the display device usually has a multilayer structure, the layer on the viewing surface side from the display layer (liquid crystal layer, organic EL layer, etc.) is transparent, and the layer on the non-viewing surface side from the display layer is usually opaque. It is. Therefore, when the entire image display device in which the protective plate is laminated on the surface on the viewing surface side of the display device through the cured resin layer is regarded as the laminate of the present invention, the laminate of the present invention is an opaque laminate. is there.
- the outermost layer on the viewing surface side of the display device (for example, the polarizing plate layer of the liquid crystal display device) is regarded as the substrate in the present invention
- the portion composed of the outermost layer on the viewing surface side, the cured resin layer, and the protective plate is laminated in the present invention.
- the image display device can be regarded as an image display device having the laminate of the present invention.
- substrate is not specifically limited, The board
- the shape of the substrate is not particularly limited, and examples thereof include a rectangular shape.
- the size of the substrate is not particularly limited, and when used as a transparent member to be installed in an opening for building or vehicle, it is preferable to have at least one side of 300 mm or more, and at least one side of 600 mm or more. More preferably. In normal applications for construction and vehicles, a size of 4 m 2 or less is appropriate. When the substrate is a display device or the outermost layer portion on the viewing surface side, the size of the substrate is equal to or larger than the size of the display device (a rectangle having at least one side of 20 mm or more).
- the transparent substrate examples include a glass plate or a resin plate. If a glass plate is used as the pair of substrates, a laminated glass can be obtained. If a polycarbonate plate is used as the resin plate, a transparent panel having a high impact property and a light weight can be obtained. Further, a glass plate and a resin plate may be used in combination. Examples of the resin plate include polycarbonate, single-layer sheets of resins such as polymethyl methacrylate, cycloolefin polymer, polyamide, polyimide, polystyrene, and aramid, or laminated sheets having layers of these resins, but are not limited thereto. It is not something.
- a transparent substrate used for the protective plate of a display device a glass plate is preferable in terms of chemical resistance.
- the opaque substrate is not limited to a display device, and includes a metal plate, an opaque resin plate, and other opaque plate-like bodies. Some display devices are transparent as a whole (such as a display portion that is temporarily opaque), and such a display device corresponds to a transparent substrate.
- the cured resin layer is a layer made of a cured product of the curable resin composition of the present invention.
- the thickness of the cured resin layer is preferably 0.01 to 0.5 mm, more preferably 0.05 to 0.3 mm. If the thickness of a cured resin layer is more than a lower limit, the mechanical strength of a laminated body will become favorable. If the thickness of a cured resin layer is below an upper limit, it is excellent at the point that a laminated body is lightweight.
- the cured resin layer sandwiched between the substrates is made of a cured product of the curable resin composition of the present invention, the cured resin layer is flexible and suppresses uneven color. It can be manufactured with high productivity.
- the laminate of the present invention is preferably produced by a production method using a reduced pressure lamination method.
- the reduced pressure lamination method is disclosed in WO 08/081838 and WO 09/016943.
- the manufacturing method using the pressure reduction lamination method of the laminated body of the present invention has the following first step and second step.
- 1st process The curable resin composition of this invention is accommodated between a pair of board
- 2nd process The said curable resin composition of the said lamination
- the pressure atmosphere in the first step is preferably a pressure atmosphere of 1 kPa or less, and more preferably a pressure atmosphere of 100 Pa or less.
- the reduced pressure atmosphere is preferably a pressure atmosphere of 1 Pa or more, and more preferably a pressure atmosphere of 10 Pa or more. .
- the adhesion strength between the pair of substrates and the sealing material is within a range in which gas does not enter from the interface between the substrate and the sealing material when the lamination precursor is placed in an atmosphere having a pressure higher than the reduced-pressure atmosphere in the second step.
- the adhesion strength between the substrate and the sealing material can be increased by using a pressure sensitive adhesive.
- substrate and a sealing material can be raised by interposing a curable adhesive in the interface of a board
- the adhesion strength between the substrate and the sealing material can also be increased by forming the sealing material with a curable resin and curing the sealing material itself after forming the laminated precursor. Examples of the sealing material include a double-sided adhesive tape.
- the curable resin composition in the lamination precursor is cured in an atmosphere at a pressure higher than the reduced pressure atmosphere in the first step.
- the curable resin composition is thermosetting, it is cured by heating, and when the curable resin composition is photocurable, it is cured by light irradiation.
- Photocuring can be performed by irradiating light through a transparent substrate from a light source such as an ultraviolet lamp.
- the cured resin layer is formed by curing the curable resin composition, and a laminate is obtained.
- the production method of the present invention even if bubbles remain in the curable resin composition in the first step, the bubbles are likely to disappear before the curable resin composition is cured in the second step, A cured resin layer without bubbles is easily formed. This is due to the following factors.
- the laminated precursor formed in the first step is placed in a pressure atmosphere higher than the reduced pressure atmosphere in the first step in the second step, the pressure on the outside of the substrate becomes larger than the pressure on the inside. Pressure is applied to the curable resin composition.
- the inside of the bubbles in the curable resin composition is at the pressure of the reduced pressure atmosphere in the first step, the volume of the bubbles is reduced by the pressure applied to the curable resin composition in the second step, or When the gas in the bubbles dissolves in the curable resin composition, the bubbles disappear.
- the laminated precursor in the second step, before curing the curable resin composition, is held for a while under a pressure atmosphere higher than the reduced-pressure atmosphere. It is preferable to do.
- the holding time is preferably 5 minutes or more. Note that the holding time may be less than 5 minutes when there are no bubbles or when the bubbles are minute and disappear quickly.
- the atmosphere having a higher pressure than the reduced-pressure atmosphere in the second step is preferably a pressure atmosphere of 50 kPa or more, more preferably a pressure atmosphere of 100 kPa or more, and an atmospheric pressure atmosphere is particularly preferable from the viewpoint of easy control of the pressure atmosphere.
- the pressure atmosphere in the first step and the second step is particularly preferably a pressure atmosphere of 100 Pa or less in the first step and an atmospheric pressure atmosphere in the second step.
- each of the pair of substrates is a transparent substrate.
- the sealing material 12 is provided on the entire periphery of one transparent substrate 10 (hereinafter simply referred to as “substrate 10”), and the sealing UV curable resin 36 is provided on the sealing material 12.
- the curable resin composition 14 is applied to the surface of the substrate 10 surrounded by the sealing material 12, and placed horizontally in the vacuum chamber 26 with the curable resin composition 14 layer facing up.
- substrate 16 The other transparent substrate 16 (hereinafter simply referred to as “substrate 16”) is held by the suction pad 32 on the upper surface plate 30 that can be moved up and down by the cylinder 34 in the decompression chamber 26, and is parallel above the substrate 10. To face.
- the decompression chamber 26 is closed, and the vacuum pump 28 is operated to evacuate, so that the inside of the decompression chamber 26 has a predetermined decompressed atmosphere.
- the cylinder 34 is operated to lower the substrate 16, the layer of the curable resin composition 14 is sandwiched between the substrate 10 and the substrate 16, and the curable resin composition 14 is sealed by the substrate 10, the substrate 16, and the sealing material 12.
- a laminated precursor is formed.
- the reduced pressure chamber 26 is returned to the atmospheric pressure atmosphere, the laminated precursor is taken out from the reduced pressure chamber 26, and the curable resin composition of the laminated precursor is heated or irradiated with light in the atmospheric pressure atmosphere. Curing is performed to obtain a laminate.
- a cured resin layer that is flexible and suppressed in color unevenness can be formed at a sufficient curing rate, so that a high-quality laminate can be produced with high productivity.
- the laminate of the present invention may be manufactured by a known manufacturing method other than the above-described manufacturing method.
- polyol (X-1) polyoxyalkylene glycol having a hydroxyl value of 28.7 mgKOH / g (molecular weight converted from the hydroxyl value: 3909).
- the polyols obtained in Production Examples 1 to 3 are shown in Table 1.
- the “EO content” is a ratio of oxyethylene groups in 100% by mass of all oxyalkylene groups in the polyol.
- Example 1 In a reaction vessel equipped with a stirrer and a nitrogen introduction tube, 1936.7 g (0.192 mol) of the polyol (A1-1) obtained in Production Example 1 and isophorone diisocyanate (hereinafter referred to as “IPDI” as polyisocyanate (A2)). 51.9 g (0.233 mol) of dioctyltin distearate (hereinafter referred to as “DOTDS”) in the presence of 0.159 g for 10 hours at 70 ° C. A prepolymer (prepolymer (A-1)) was obtained. The blending amount of IPDI with respect to polyol (A1-1) was 121 in terms of isocyanate index.
- IPDI isophorone diisocyanate
- the isocyanate group content of the prepolymer (A-1) was 0.2429% by mass. 1988.7 g of prepolymer (A-1) (isocyanate group amount: 0.115 mol), 0.54 g of dibutyltin dilaurate (hereinafter referred to as “DBTDL”), 2,5-di-tert-butylhydroquinone 0.6 g (hereinafter referred to as “DtBHQ”) and 13.4 g (hydroxyl group amount: 0.115 mol) of 2-hydroxyethyl acrylate (hereinafter referred to as “HEA”) as the compound (B1).
- DBTDL dibutyltin dilaurate
- DtBHQ 2,5-di-tert-butylhydroquinone 0.6 g
- HOA 2-hydroxyethyl acrylate
- a curable resin composition was prepared by adding 0.3 g of BASF) and 0.04 g of DtBHQ as a polymerization inhibitor and mixing them.
- Example 2 In a reaction vessel equipped with a stirrer and a nitrogen introducing tube, 491.0 g (0.0273 mol) of the polyol (A1-2) obtained in Production Example 2 and 7.4 g (0 of IPDI as polyisocyanate (A2)) were obtained. 0.0333 mol) was added and reacted at 70 ° C. for 3 hours in the presence of 0.0398 g of DOTDS to obtain an isocyanate group-terminated urethane prepolymer (prepolymer (A-2)). The blending amount of IPDI with respect to polyol (A1-2) was 122 in terms of isocyanate index. The isocyanate group content of the prepolymer (A-2) was 0.141% by mass.
- the storage modulus of cured product On the soda-lime glass plate, the curable resin composition obtained in each example was applied to a thickness of 0.4 mm, and ultraviolet light (light source: a mercury xenon lamp manufactured by Ushio Electric Co., Ltd., illuminance: 400 mW / cm 2 under nitrogen flow) , Accumulated light amount: 6000 mJ / cm 2 ) and cured. Thereafter, the storage elastic modulus of the cured product was measured using a rheometer MCR-301 manufactured by Anton Paar. The measurement conditions were a frequency of 1 Hz, a strain of 1%, and a temperature of 35 ° C.
- the curable resin composition obtained in each example was applied to a thickness of 0.1 mm, and ultraviolet light (light source: Fusion D-bulb metal halide lamp, illuminance: 800 mW / cm 2) under nitrogen flow. (Integrated light amount: 500 mJ / cm 2 ) was irradiated. The sample after ultraviolet irradiation was measured by FT-IR, and the curability was evaluated according to the following criteria. “ ⁇ (good)”: The absorbance at 810 cm ⁇ 1 due to the unsaturated bond of the acrylic group is less than 5% of the absorbance before ultraviolet irradiation. “X (bad)”: The absorbance at 810 cm ⁇ 1 due to the unsaturated bond of the acrylic group is 5% or more of the absorbance before ultraviolet irradiation.
- the liquid crystal display device was taken out from a commercially available 7-inch liquid crystal digital photo frame (manufactured by Sony Corporation, DPF-0720).
- the display mode is a VA (Virtical Alignment) type, and the size of the display unit is 88 mm long and 156 mm wide.
- Polarizers were bonded to both surfaces of the liquid crystal display device, and a printed wiring board was bonded to the end of the long side FPC.
- the liquid crystal display device was designated as display device A.
- the display device A was placed flat so that the surface on which the photocurable resin composition was formed was on the upper surface of the lower surface plate in the decompression device in which a pair of surface plate lifting devices were installed.
- a seal portion-forming resin composition C obtained in the same manner as in the examples of International Publication No. 2011/052747 has a width of about 1 mm and a coating thickness over the entire circumference at a position of about 5 mm on the outer circumference of the display device A. It applied with a dispenser so that it might be set to about 0.4 mm, and the uncured seal part was formed.
- the curable resin composition of Example 2 (photo-curable resin composition for resin layer formation) of Example 2 was supplied to a plurality of locations in a region inside the uncured seal portion so that the film thickness was 200 ⁇ m.
- the glass plate B was installed on the lower surface of the upper surface plate of the lifting device in the decompression device so as to face the display device A.
- the glass plate B was held so that the distance from the display device A was 30 mm in the vertical direction.
- the decompression device was sealed and evacuated until the pressure in the decompression device reached about 10 Pa.
- the upper and lower surface plates were brought close to each other by an elevating device in the decompression device, and pressed with a pressure of 2 kPa and held for 1 minute. Static electricity is removed from the electrostatic chuck, the glass plate B is separated from the upper surface plate, the pressure reducing device is returned to atmospheric pressure in about 15 seconds, and the light for forming the resin layer is formed by the display device A, the glass plate B, and the uncured seal portion.
- a laminated precursor D in which the curable resin composition was sealed was obtained.
- the shape of the uncured seal portion was maintained in an almost initial state.
- the laminated precursor D is irradiated with ultraviolet rays (light source: Fusion D-bulb metal halide lamp, illuminance: 800 mW / cm 2 , integrated light quantity: 500 mJ / cm 2 ) from the glass plate B side, and the uncured seal portion and resin
- the photocurable resin composition for layer formation was cured.
- the obtained display device was designated as a display device E1.
- Display devices E2 to E4 were obtained in the same manner by using the compositions of Comparative Examples 1, 4, and 5 instead of the composition of Example 2 as the photocurable resin composition for forming a resin layer.
- the display devices E1 to E4 were returned to the housing of the liquid crystal monitor from which the liquid crystal display device was taken out, the wiring was reconnected, and then the liquid crystal monitor was installed so that the display device A bonded to the glass plate B was vertical. After standing for 5 days, the power was turned on and the displayed image was evaluated. “ ⁇ (good)”: The image is homogeneous over the entire display area. “X (defect)”: An image has a non-uniform (uneven) portion in a part of the display portion.
- Haze Haze was measured by the following method. Curability prepared in Examples and Comparative Examples having a liquid amount of 200 ⁇ m on a 100 mm ⁇ 100 mm ⁇ 2 mm soda lime glass plate surrounded by double-sided tape having a thickness of 0.2 mm and a width of 5 mm on four sides. The resin composition was dropped. Subsequently, a 100 mm ⁇ 100 mm ⁇ 2 mm soda lime glass plate was overlaid on the curable resin composition so that no bubbles would enter.
- the obtained overlay sample is conveyed by a UV conveyor (product name: QRM-2288, HgXe lamp) manufactured by ORC, and irradiated with light having an illuminance of 100 mW / cm 2 and an integrated light amount of 3,000 mJ / cm 2.
- a cured product was obtained, which was used as a sample for haze measurement.
- the haze of the obtained sample was measured using a color / turbidity measuring device (product name: COH400) manufactured by Nippon Denshoku. Evaluation was performed according to the following criteria. “ ⁇ (good)”: haze value of less than 1.0%. “ ⁇ (defect)”: haze value of 1.0% or more.
- Table 2 The evaluation results of each example are shown in Table 2.
- 4HBA 4-hydroxybutyl acrylate.
- LA lauryl acrylate.
- 2-HBMA 2-hydroxybutyl methacrylate.
- LMA lauryl methacrylate.
- Examples 1 and 2 which are curable resin compositions of the present invention, a cured product having a high curing rate and a low storage elastic modulus was formed. Further, no peeling was observed in the reliability test, and the reliability was excellent. In Examples 1 and 2, the haze value was good at less than 1.0%, and it was confirmed that color unevenness was suppressed. Further, the viscosity of the oligomers (I-1) and (I-2) of Examples 1 and 2 was almost equal to the viscosity of the oligomer (Z-1) of Comparative Examples 1 to 3.
- Comparative Example 1 which is a curable resin composition containing an oligomer (Z-1) obtained by using a polyol having a large hydroxyl value
- the storage modulus of the cured product is high, so that the flexibility is not sufficient, Color unevenness occurred and the reliability was poor.
- Comparative Example 2 in which a small amount of chain transfer agent is blended with the curable resin composition containing the oligomer (Z-1), the cured product has a high storage elastic modulus, so that the flexibility is not sufficient. Also, the reliability was inferior.
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Abstract
Description
透明基板上の周縁部にシール材を配置し、光硬化性樹脂を含む硬化性樹脂組成物の層を該シール材の内側に形成し、減圧下にもう一枚の透明基板を該硬化性樹脂組成物の層の上に重ねて、透明基板の間で硬化性樹脂組成物を密閉した後、大気圧雰囲気下で該硬化性樹脂組成物に光照射して硬化させる方法(特許文献1)。
硬化性樹脂組成物としては、アクリロイルオキシ基、メタクリロイルオキシ基等の光硬化性の不飽和基を有する不飽和ウレタンオリゴマーを含む硬化性樹脂組成物が知られている(特許文献1、2)。
[1]下記プレポリマー(A)と下記化合物(B)とを反応させて得られた不飽和ウレタンオリゴマー(I)、ならびに、下式(II-1)で表される単量体、下式(II-2)で表される単量体、下式(II-3)で表される単量体および下式(II-4)で表される単量体からなる群から選ばれる少なくとも1種の単量体(II)を含む硬化性樹脂組成物。
プレポリマー(A):下記ポリオール(A1)とポリイソシアネート(A2)とを、イソシアネートインデックスが100超160以下の条件で反応させて得られたイソシアネート基末端ウレタンプレポリマー。
ポリオール(A1):平均活性水素数が2~4の開始剤(a11)に炭素数3以上のアルキレンオキサイド(a12)を反応させて得られた、水酸基価3~13mgKOH/gのポリオキシアルキレンポリオール。
化合物(B):下記硬化性官能基と水酸基とを有する化合物。
硬化性官能基:CH2=C(R1)C(O)O-で表される基(ただし、R1は水素原子またはメチル基である。)。
mは1~3の整数である。
Q1は炭素数2~4のオキシアルキレン基であり、nは2~8の整数である。)
[3]前記化合物(B)が、下式(B1)で表わされる化合物である、[1]または[2]に記載の硬化性樹脂組成物。
[4]前記硬化性樹脂組成物中の前記不飽和ウレタンオリゴマー(I)の含有量が、20~75質量%である、[1]~[3]のいずれかに記載の硬化性樹脂組成物。
[5]前記硬化性樹脂組成物中の前記単量体(II)の含有量が、25~65質量%である、[1]~[4]のいずれかに記載の硬化性樹脂組成物。
[7]前記硬化性樹脂組成物中の前記式(III)で表される単量体の含有量が、35~50質量%である、[6]に記載の硬化性樹脂組成物。
[8]光重合開始剤(IV)をさらに含む、[1]~[7]のいずれかに記載の硬化性樹脂組成物。
[9]前記硬化性樹脂組成物が、一対の基板と該一対の基板の間に挟まれた硬化樹脂層とを有する積層体の製造における前記硬化樹脂層の形成に用いられる、[1]~[8]のいずれかに記載の硬化性樹脂組成物。
[11]一対の基板の一方が表示デバイスかつ他方が透明な保護板であり、前記硬化樹脂層が前記表示デバイスの視認側に接している、[10]に記載の積層体。
前記減圧雰囲気よりも圧力が高い雰囲気下で前記積層前駆体の前記硬化性樹脂組成物を硬化させる第2の工程と、を有する、積層体の製造方法。
[13]前記減圧雰囲気が100Pa以下の圧力雰囲気であり、前記減圧雰囲気よりも圧力が高い雰囲気が大気圧雰囲気である、[12]に記載の積層体の製造方法。
[14]前記一対の基板の少なくとも一方が透明な基板であり、前記第2の工程において前記硬化性樹脂組成物を光照射により硬化させる、[12]または[13]に記載の積層体の製造方法。
[15]一対の基板の一方が表示デバイスかつ他方が透明な保護板であり、前記表示デバイスの視認側と前記保護板との間に前記硬化性樹脂組成物を収容する、[12]~[14]のいずれかに記載の積層体の製造方法。
本発明の積層体は、柔軟で色ムラが抑制された硬化物を有し、かつ生産性が高い。
本発明の積層体の製造方法によれば、高い生産性で、柔軟で色ムラが抑制された硬化樹脂層を有する積層体を製造できる。特に、本発明の硬化性樹脂組成物を表示デバイスへの保護板の貼り付けに適用した場合、光学特性等の物性が良好な画像表示装置が得られる。
なお、硬化性官能基、すなわちCH2=C(R1)C(O)O-で表される基(ただし、R1は水素原子またはメチル基である。)は、(メタ)アクリロイルオキシ基である。
また、式(B1)で表される化合物を化合物(B1)と記し、他の式で表される化合物および単量体についても同様に記す。
たとえば、液晶表示デバイス(表示面の最外層が偏光板からなるもの)に保護板を硬化性樹脂組成物の硬化物で接合した画像表示装置において、偏光板と該硬化物と保護板の積層部分は透明な積層体ということができる。このような積層体においては、基板の一方は偏光板であり、他方の基板は保護板であり、両者は透明な基板に相当する。なお、液晶表示デバイス全体を1つの基板と考えると、その基板は不透明な基板である。
本発明の積層体は透明積層体に限られず、基板は不透明な基板であってもよい。好ましくは一対の基板の少なくとも一方が透明な基板であり、より好ましくは一対の基板の両方ともが透明な基板である。
本発明の硬化性樹脂組成物は、不飽和ウレタンオリゴマー(I)(以下、「オリゴマー(I)」と記す。)と単量体(II)を含む硬化性樹脂組成物である。本発明の硬化性樹脂組成物は、一対の透明基板の間に狭まれた硬化性樹脂組成物を硬化させて透明積層体を製造する方法に好適に使用できる。
オリゴマー(I)は、後述するイソシアネート基末端ウレタンプレポリマーであるプレポリマー(A)と化合物(B)とを反応させて得られる反応生成物である。オリゴマー(I)は、後述するように(メタ)アクリロイルオキシ基を有する。
プレポリマー(A)は、後述するポリオール(A1)とポリイソシアネート(A2)とを、イソシアネートインデックスが100超160以下の条件で反応させて得られたウレタンプレポリマーである。プレポリマー(A)は、末端にイソシアネート基を有している。
なお、イソシアネートインデックスとは、ポリイソシアネート(A2)のイソシアネート基のモル数をポリオール(A1)の水酸基のモル数で除して100倍した値である。
プレポリマー(A)は、1種を単独で使用してもよく、2種以上を併用してもよい。
ポリオール(A1)は、炭素数3以上のオキシアルキレン基からなるポリオキシアルキレン鎖を有する。ポリオール(A1)としては、触媒(a13)の存在下、開始剤(a11)にアルキレンオキサイド(a12)を反応させて得られるポリオキシアルキレンポリオールが好ましい。
ポリオール(A1)は、1種を単独で使用してもよく、2種以上を併用してもよい。
たとえば、汎用のアルカリ金属化合物触媒(水酸化カリウム等。)を用いて開始剤にプロピレンオキサイド(以下、「PO」と記す。)を反応させ、水酸基価の低いポリオキシアルキレンポリオールを得ると、POの異性化反応が起こりやすくなり、異性化反応により生成したアリルアルコールのために不飽和度が高くなる。不飽和度の高いポリオキシアルキレンポリオールを用いて得られるオリゴマー(I)を含む硬化物は、機械的物性が不充分となるおそれがある。
水酸基価が低く、かつ不飽和度の低いポリオール(A1)を製造するためには、触媒(a13)としては、複合金属シアン化物錯体が特に好ましい。
亜鉛ヘキサシアノコバルテートと錯体を形成させるエーテルとしては、エチレングリコールジメチルエーテル(グライム)、ジエチレングリコールジメチルエーテルが好ましく、錯体の製造時の取り扱いやすさの点から、グライムが特に好ましい。
亜鉛ヘキサシアノコバルテートと錯体を形成させるアルコールとしては、tert-ブタノール、tert-ブチルセロソルブが好ましい。
活性水素とは、水酸基の水素原子、アミノ基の水素原子等、アルキレンオキサイドが反応しうる活性な水素原子をいう。活性水素としては、水酸基の水素原子が好ましい。したがって、開始剤(a11)としては、平均水酸基数が2~4のポリヒドロキシ化合物が好ましく、平均水酸基数が2~3のポリヒドロキシ化合物がより好ましい。
開始剤(a11)の平均水酸基数がこの範囲であれば、得られるポリオール(A1)のも同じ範囲の平均水酸基数となる。
触媒(a13)として複合金属シアン化物錯体を用いる場合、開始剤(a11)の分子量は500~1500が好ましい。具体的には、開始剤(a11)としては、2~4価の多価アルコールにPOを反応させて得られる分子量500~1500のポリオキシプロピレンポリオールが好ましい。
開始剤(a11)は、1種を単独で使用してもよく、2種以上を併用してもよい。
炭素数3以上のアルキレンオキサイドとしては、PO、1,2-ブチレンオキサイド、2,3-ブチレンオキサイド、スチレンオキサイド等が挙げられる。なかでも、アルキレンオキサイド(a12)としては、POが好ましい。アルキレンオキサイド(a12)がPOであると、硬化物の物性が柔軟となる点で良好となる。
アルキレンオキサイド(a12)は、1種を単独で使用してもよく、2種以上を併用してもよい。
アルキレンオキサイド(a12)は、炭素数が2であるエチレンオキサイド(以下、「EO」と記す。)以外のアルキレンオキサイドである。ポリオール(A1)がオキシエチレン基を含まないことで、得られるオリゴマー(I)の硬化物の透明性が良好になる。
ポリオール(A1)の1分子あたりの平均水酸基数は、開始剤(a11)が1種の場合、開始剤(a11)の1分子あたりの活性水素数であり、開始剤(a11)が2種の混合物の場合、開始剤(a11)の1分子あたりの活性水素数の平均値である。
なお、ポリオール(A1)の水酸基価は、JIS K1557-1(2007年版)にしたがって測定される値である。
水酸基価が前記範囲内のポリオール(A1)を用いると、柔軟かつ色ムラが抑制された硬化性樹脂組成物の硬化物が得られるため、連鎖移動剤等で反応性が下がることがない。
ポリイソシアネート(A2)の1分子あたりの平均イソシアネート基数は、2~4が好ましく、2が特に好ましい。すなわち、ポリイソシアネート(A2)としては、ジイソシアネートが好ましい。
ポリイソシアネート(A2)は、1種を単独で使用してもよく、2種以上を併用してもよい。
化合物(B)は、下記硬化性官能基、すなわち(メタ)アクリロイルオキシ基と水酸基とを有する化合物である。
硬化性官能基:CH2=C(R1)C(O)O-で表される基(ただし、R1は水素原子またはメチル基である。)。
プレポリマー(A)と化合物(B)を反応させることで、プレポリマー(A)の末端のイソシアネート基と化合物(B)の水酸基が反応してウレタン結合が形成され、(メタ)アクリロイルオキシ基を有するオリゴマー(I)が得られる。
ポリイソシアネート(A2)としてジイソシアネートを使用した場合、硬化性官能基を平均2~4個有するプレポリマー(A)を製造するためには、1分子中に前記硬化性官能基と水酸基とをそれぞれ1個有する化合物(B)が好ましい。
化合物(B)としては、下記化合物(B1)が好ましい。
前記式(B1)のR4は、反応性の高いオリゴマー(I)を得るためには、水素原子が好ましい。すなわち、化合物(B1)が有する硬化性官能基は、アクリロイルオキシ基であることが好ましい。
前記式(B1)のQ2は、炭素数2~8のアルキレン基が好ましく、炭素数2~4のアルキレン基がより好ましい。
化合物(B)としては、化合物(B1)のなかでも、炭素数が2~4のヒドロキシアルキル基を有するヒドロキシアルキルアクリレートがより好ましい。
化合物(B)は、1種を単独で使用してもよく、2種以上を併用してもよい。
オリゴマー(I)は、前記したプレポリマー(A)と化合物(B)の反応生成物である。オリゴマー(I)は、アクリロイルオキシ基とメタクリロイルオキシ基の両方を有していてもよいが、アクリロイルオキシ基またはメタクリロイルオキシ基のいずれかのみを有していることが好ましく、アクリロイルオキシ基のみを有していることがより好ましい。オリゴマー(I)は、高分子量であるため、(メタ)アクリロイルオキシ基の反応性、すなわち硬化性が低くなりやすい。そのため、相対的に低分子量の単量体と併用する場合、メタクリロイルオキシ基よりも反応性の高いアクリロイルオキシ基を有するオリゴマー(I)とすることで、併用する単量体とオリゴマー(I)との硬化性の差が小さくなり、均一な硬化物が得られやすくなる。
前記(メタ)アクリロイルオキシ基の数が下限値以上であれば、硬化物が高温に曝されても変形し難い。前記(メタ)アクリロイルオキシ基の数が上限値以下であれば、硬化物が脆くなり難い。
ポリイソシアネート(A2)のイソシアネート基数を2とする場合、化合物(B)が有する(メタ)アクリロイルオキシ基の数と水酸基の数が1であれば、オリゴマー(I)の1分子あたりの平均の(メタ)アクリロイルオキシ基の数は、ポリオール(A1)1分子あたりの平均水酸基数とほぼ同じとなる。
たとえば、ポリイソシアネート(A2)としてジイソシアネート、化合物(B)として化合物(B1)を使用する場合、ポリオール(A1)としてジオールのみを使用することにより、1分子あたりの(メタ)アクリロイルオキシ基の平均数が2のオリゴマー(I)が得られる。同様に、ポリオール(A1)としてジオールとトリオールを用いることにより、1分子あたりの(メタ)アクリロイルオキシ基の平均数が2と3の間のオリゴマー(I)が得られ、ポリオール(A1)としてトリオールのみを用いることにより、1分子あたりの(メタ)アクリロイルオキシ基の平均数が3のオリゴマー(I)が得られる。
本発明の硬化性樹脂組成物に含まれるオリゴマー(I)は、1種であってもよく、2種以上であってもよい。
オリゴマー(I)の製造方法としては、たとえば、下記工程(i)および工程(ii)を有する方法が挙げられる。
工程(i):ポリオール(A1)とポリイソシアネート(A2)をイソシアネートインデックスが100超160以下の条件で反応させてプレポリマー(A)を得る。
工程(ii):必要に応じて重合禁止剤の存在下、プレポリマー(A)と化合物(B)を反応させてオリゴマー(I)を得る。
ポリオール(A1)とポリイソシアネート(A2)の反応には、ウレタン化触媒を使用することが好ましい。
ウレタン化触媒としては、ナフテン酸コバルト、ナフテン酸亜鉛、2-エチルヘキサン酸亜鉛、ジブチル錫ジラウレート、2-エチルヘキサン酸錫、トリエチルアミン、1,4-ジアビシクロ[2.2.2]オクタン等が挙げられる。
反応温度は、30~90℃が好ましい。
重合禁止剤としては、ヒドロキノン、ヒドロキノンモノメチルエーテル、2,5-ジ-tert-ブチルヒドロキノン、2,6-ジ-tert-ブチルヒドロキノン、o-ニトロトルエン等が挙げられる。
重合禁止剤の使用量は、反応に使用する化合物(B)の総質量に対して50~5000質量ppmが好ましい。
反応温度は、30~90℃が好ましい。
本発明の硬化性樹脂組成物は、オリゴマー(I)に加えて、下記単量体(II-1)、下記単量体(II-2)、下記単量体(II-3)、および下記単量体(II-4)からなる群から選ばれる少なくとも1種の単量体(II)を含む。
硬化性樹脂組成物が単量体(II)を含むことで、得られる硬化物の親水性が高まる。そのため、積層体の硬化樹脂層を本発明の硬化性樹脂組成物で形成し、基材の少なくとも一方がガラス板の場合に、硬化樹脂層とガラス板の表面との親和性が向上し、それらの密着性が高まる。また、硬化性樹脂組成物が単量体(II)を含むことで、硬化物の強度も高まる。
mは1~3の整数である。
Q1は炭素数2~4のオキシアルキレン基であり、nは2~8の整数である。
単量体(II-1)としては、2-ヒドロキシエチルアクリレート、2-ヒドロキシプロピルアクリレート、3-ヒドロキシプロピルアクリレート、2-ヒドロキシブチルアクリレート、4-ヒドロキシブチルアクリレート、ペンタンジオールモノアクリレート、ヘキサンジオールモノアクリレート、8-ヒドロキシオクチルアクリレート等が挙げられる。なかでも、単量体(II-1)としては、2-ヒドロキシエチルアクリレート、2-ヒドロキシプロピルアクリレート、4-ヒドロキシブチルアクリレートが好ましい。
単量体(II-2)としては、カプロラクトンアクリレート等が挙げられ、市販品としてはSartomer社のカプロラクトンアクリレート(商品名SR-495)等が挙げられる。
単量体(II-3)としては、ポリプロピレングリコールモノアクリレート、ポリエチレングリコールモノアクリレート、ポリ(オキシプロピレン/オキシエチレン)グリコールモノアクリレート等が挙げられる。なかでも、単量体(II-3)としては、ポリプロピレングリコールモノアクリレートが好ましい。
単量体(II)は、1種を単独で使用してもよく、2種以上を併用してもよい。
本発明の硬化性樹脂組成物は、オリゴマー(I)および単量体(II)に加えて、下記単量体(III)を含むことが好ましい。
硬化性樹脂組成物が単量体(III)を含む態様は、得られる硬化物の弾性率が低くなり、耐引き裂き性が向上する。
前記式(III)におけるR3のアルキル基の炭素数は、8~22であり、10~18が好ましい。炭素数が8以上であれば、単量体の揮発性が高くなりすぎたり、硬化物のガラス転移温度が高くなりすぎることを抑制できる。また、炭素数が22以下であれば、原料のアルコール成分が天然物由来であることより、比較的安価に入手しやすい。
単量体(III)は、1種を単独で使用してもよく、2種以上を併用してもよい。
本発明の硬化性樹脂組成物は、光重合開始剤(IV)を含むことが好ましい。すなわち、本発明の硬化性樹脂組成物は、光照射によって硬化反応が進行する光硬化性樹脂組成物であることが好ましい。
光重合開始剤(IV)としては、可視光線または紫外線(波長300~400nm)の照射により励起され、活性化して硬化反応を促進するものが好ましい。具体的には、ベンゾインエーテル系光重合開始剤、α-ヒドロキシアルキルフェノン系光重合開始剤、アシルフォスフィンオキサイド系光重合開始剤等が挙げられる。
光重合開始剤(IV)は、1種を単独で使用してもよく、2種以上を併用してもよい。
本発明の硬化性樹脂組成物は、本発明の効果を損なわない範囲で、オリゴマー(I)、単量体(II)、単量体(III)および光重合開始剤(IV)以外の他の成分(V)を含んでいてもよい。たとえば、本発明の硬化性樹脂組成物は、得られる硬化物の物性を調整する目的で、オリゴマー(I)以外の他のオリゴマーを含んでいてもよい。
他のオリゴマーとしては、ポリオール(A1)以外のポリオールを用いて得られるウレタン(メタ)アクリレートオリゴマー、ポリオキシアルキレンポリオールに(メタ)アクリル酸を反応させて得られるポリ(メタ)アクリレート、ポリエステルポリオールに(メタ)アクリル酸を反応させて得られるポリ(メタ)アクリレート等が挙げられる。
他の単量体としては、(メタ)アクリロイルオキシ基の数が1~6である化合物が好ましく、柔軟な硬化物が得られやすい点で、(メタ)アクリロイルオキシ基の数が1~2である化合物がより好ましい。また、硬化性樹脂組成物の塗布性を高める点から、他の単量体としては、25℃における粘度が1Pa・s以下の低粘度の単量体が好ましい。粘度の低い単量体は反応性希釈剤と呼ばれることもある。前記粘度は、E型粘度計(東機産業社製、RE-85U)を用いて測定される値である。
他の単量体としては、多価アルコールに(メタ)アクリル酸を反応させて得られるポリ(メタ)アクリレート等が挙げられる。他の単量体は、透明性を損なわなければメタクリロイルオキシ基を有する化合物を用いることができるが、アクリロイルオキシ基を有する化合物であることが好ましい。
ベンゾトリアゾール系紫外線吸収剤としては、例えば、2-(2-ヒドロキシ-5-メチルフェニル)ベンゾトリアゾール、2,4-ビス(1-メチル-1-フェニルエチル)-6-(2H-ベンゾトリアゾール-2-イル)フェノール、2-(5-クロロ-2-ベンゾトリアゾリル)-6-tert-ブチル-p-クレゾール、2-(2-ヒドロキシ-5-tert-オクチルフェニル)ベンゾトリアゾール、(2,2-メチレンビス〔6-(2H-ベンゾトリアゾール-2-イル)-4-(1,1,3,3,-テトラメチルブチル)フェノール〕、2-(2H-ベンゾトリアゾール-2-イル)-4,6-ビス(1,1-ジメチル-プロピル)-フェノール等が挙げられる。
ベンゾフェノン系紫外線吸収剤としては、例えば、2-ヒドロキシ-4-n-オクチルオキシベンゾフェノン、(2,4-ジヒドロキシフェニル)フェニル-メタノンなどが挙げられる。
ベンゾエート系紫外線級剤としては、例えば、2-[4,6-ジフェニル-1,3,5-トリアジン-2-イル]-5-(ヘキシルオキシ)フェノール等が挙げられる。
ヒンダードアミン系の光安定剤としては、例えば、N,N’-ビス(2,2,6,6-テトラメチル-4-ピペリジニル)-N’-[4-[ブチル(2,2,6,6-テトラメチル-4-ピペリジニル)アミノ]-1,3,5-トリアジン-2-イル]-1,6-ヘキサンジアミン、ブタン二酸1-[2-(4-ヒドロキシ-2,2,6,6-テトラメチルピペリジノ)エチル]、2-ブチル-2-(4-ヒドロキシ-3,5-ジ-tert-ブチルベンジル)マロン酸ビス(1,2,2,6,6-ペンタメチルピペリジン-4-イル)、デカン二酸ビス(1,2,2,6,6-ペンタメチルピペリジン-4-イル)、デカン二酸ビス(2,2,6,6-テトラメチル-4-ピペリジニル)、ブタン-1,2,3,4-テトラカルボン酸テトラキス(1,2,2,6,6-ペンタメチル-4-ピペリジニル)、1,2,3,4-ブタンテトラカルボン酸テトラキス(2,2,6,6-テトラメチルピペリジン-4-イル)、メタクリル酸1,2,2,6,6-ペンタメチル-4-ピペリジル;メタクリル酸(1,2,2,6,6-ペンタメチルピペリジン-4-イル)、メタクリル酸2,2,6,6-テトラメチル-4-ピペリジル、7-オキサ-3,20-ジアザジスピロ[5.1.11.2]ヘンエイコサン-20-プロパノン酸,2,2,4,4-テトラメチル-21-オキソ,ドデシル/テトラデシルエステル、2,2,4,4-テトラメチル-7-オキサ-3, 20ジアザジスピロ[5.1.11.2]-ヘンエイコサン-21-オン、β-アラニン, N-(2,2,4,4-テトラメチル-4-ピペリジニル)-,ドデシル/テトラデシルエステル、2,5-ピロリジンジオン, 3-ドデシル-1-(2,2,6,6-テトラメチル-4-ピペリジニル)、2,5-ピロリジンジオン, N-アセチル-3-ドデシル-1-(2,2,6,6-テトラ-メチル-4-ピペリジニル)等が挙げられる。
フェノール系酸化防止剤としては、例えば、ペンタエリトリトールテトラキス[3-(3,5-ジ-tert-ブチル-4-ヒドロキシフェニル)プロピオナート]、2,2’-チオジエチルビス[3-(3,5-ジ-tert-ブチル-4-ヒドロキシフェニル)プロピオナート]、3-(3,5-ジ-tert-ブチル-4-ヒドロキシフェニル)プロピオン酸ステアリル、N,N’-(1,6-ヘキサンジイル)ビス[3,5-ビス(1,1-ジメチルエチル)-4-ヒドロキシベンゼンプロパンアミド]、オクチル-3,5-ジ-tert-ブチル-4-ヒドロキシ-ヒドロ肉桂酸、2,4,6-トリス(3’,5’-ジ-tert-ブチル-4’-ヒドロキシベンジル)メシチレン、カルシウムビス[3,5-ジ(tert-ブチル)-4-ヒドロキシベンジル(エトキシ)ホスフィナート]、2,4-ビス(オクチルチオメチル)-6-メチルフェノール、2,4-ビス[(オクチルチオ)メチル]-6-メチルフェノール、ビス[3-(1,1-ジメチルエチル)-4-ヒドロキシ-5-メチルベンゼンプロピオン酸]エチレンビス(オキシ-2,1-エタンジイル)、1,6-ヘキサンジオール-ビス[3(3,5-ジ-t-ブチル-4-ヒドロキシフェニル)プロピオネート]、1,3,5-トリス[[3,5-ビス(1,1-ジメチルエチル)-4-ヒドロキシフェニル]メチル]-1,3,5-トリアジン-2,4,6(1H,3H,5H)-トリオン、1,1’-イミノビス[4-(1,1,3,3-テトラメチルブチル)ベンゼン]、4-[[4,6-ビス(オクチルチオ)-1,3,5-トリアジン-2-イル]アミノ]-2,6-ジ-tert-ブチルフェノール、ジエチル{[3,5-ビス(1,1-ジメチルエチル)-4-ヒドロキシルフエニル] メチル}ホスホネート等が挙げられる。
また、複数の酸化防止剤、光安定剤等を混合した製品も使用できる。例えばBASF社製のIRGASTAB PUR68、TINUVIN B75等が挙げられる。
また、硬化性樹脂組成物には、塗布性を高めるために塗布用の組成物として溶剤を含ませてもよい。この場合、塗布用の組成物を塗布した後に溶剤を除いて硬化性樹脂組成物とし、それを硬化させる。ただし、後述の積層体の製造に本発明の硬化性樹脂組成物を使用する場合は、揮発性成分を有することは好ましくないため、溶剤を使用しないことが好ましい。
本発明の硬化性樹脂組成物は、特に後述の積層体の製造に使用する場合、オリゴマー(I)と単量体(II)と単量体(III)とを含む硬化性樹脂組成物であることが好ましい。また、本発明の硬化性樹脂組成物は、光重合開始剤(IV)をさらに含むことがより好ましい。
なお、本発明の硬化性樹脂組成物は、オリゴマー(I)と単量体(II)のみからなる組成物であってもよい。
本発明の硬化性樹脂組成物に前記他の成分(V)が含まれる場合、本発明の硬化性樹脂組成物(100質量%)中の該他の成分(V)の含有量は、10質量%以下が好ましく、5質量%以下がより好ましい。
具体的には、減圧積層方法を用いた製造方法で積層体を製造する場合の硬化性樹脂組成物は、大気圧雰囲気下の沸点が150℃以下の単量体を含まないことが好ましく、大気圧雰囲気下の沸点が200℃以下の単量体を含まないことがより好ましい。単量体(II)および単量体(III)の沸点は200℃よりも高い。単量体(III)よりもアルキル基の炭素数が小さいアルキル(メタ)アクリレートは低沸点であることが多く、該アルキル(メタ)アクリレートは含まないことが好ましい。
なお、粘度は、E型粘度計(東機産業社製、RE-85U)を用いて測定される値である。ただし、硬化性樹脂組成物の粘度が100Pa・s以下の場合は、ロータとして1°34’×R24を用い、100Pa・sを超える粘度の場合は、ロータとして3°×R9.7を用いるものとする。
また、本発明の硬化性樹脂組成物は、前記積層体における硬化樹脂層を形成する硬化性樹脂組成物以外にも、接着剤、コーティング剤等の用途で使用できる。
本発明の積層体は、一対の基板と、該一対の基板の間に挟まれた硬化樹脂層とを有する積層体であって、前記硬化樹脂層が、本発明の硬化性樹脂組成物が硬化されてなる硬化樹脂の層であることを特徴とする。
本発明の積層体における基板は透明な基板であっても不透明な基板であってもよい。また、基板は多層構造体であっても単層構造体であってもよい。一対の基板のうち少なくとも一方は透明基板であることが好ましい。より好ましくは一対の基板の両方が透明基板である。なお、本発明の硬化性樹脂組成物を光照射により硬化させる場合は、少なくとも一方の基板は透明基板である必要があり、透明基板を通して光を硬化性樹脂組成物に照射する。本発明の硬化性樹脂組成物を熱硬化させる場合は、一対の基板の両方とも不透明な基板であってもよい。
また、一対の基板のうちの一方が、液晶表示デバイスや有機EL表示デバイスなどの表示デバイスである場合、表示デバイスは全体として不透明であるのが通例である。ただし、表示デバイスは通常多層構造を有し、表示層(液晶層や有機EL層など)から視認面側の層は透明であり、表示層から非視認面側の層は不透明であるのが通例である。したがって、表示デバイスの視認面側の表面に硬化樹脂層を介して保護板が積層された画像表示装置全体を本発明の積層体とみなした場合は、本発明の積層体は不透明な積層体である。また、表示デバイスの視認面側最外層(たとえば、液晶表示デバイスの偏光板層)を本発明における基板とみなした場合、視認面側最外層と硬化樹脂層と保護板からなる部分が本発明積層体であり、上記画像表示装置は本発明積層体を有する画像表示装置とみなすことができる。
基板の形状は、特に限定されず、矩形状等が挙げられる。
基板の大きさは、特に限定されず、建築用や車両用の開口部に設置する透明部材として利用する場合、300mm以上の辺を少なくとも1つ有することが好ましく、600mm以上の辺を少なくとも1つ有することがより好ましい。建築用や車両用の通常の用途においては、4m2以下の大きさが適当である。また、基板が表示デバイスやその視認面側最外層部分である場合は、基板の大きさは表示デバイスの大きさ(20mm以上の辺を少なくとも1つ有する矩形)以上となる。
表示デバイスの保護板に用いられる透明基板としては、耐薬品性などの点でガラス板が好ましい。
不透明な基板としては、表示デバイスに限られず、金属板、不透明樹脂板、その他の不透明な板状体が挙げられる。なお、表示デバイスであっても全体が透明なもの(一時的に表示部分が不透明となるものなど)もあり、このような表示デバイスは透明基板に相当する。
硬化樹脂層の厚さは、0.01~0.5mmが好ましく、0.05~0.3mmがより好ましい。硬化樹脂層の厚さが下限値以上であれば、積層体の機械的強度が良好となる。硬化樹脂層の厚さが上限値以下であれば、積層体が軽量である点で優れる。
本発明の積層体は、減圧積層方法を用いた製造方法によって製造することが好ましい。減圧積層方法は、国際公開第08/081838号および国際公開第09/016943号に開示されている。本発明の積層体の減圧積層方法を用いた製造方法は、下記の第1の工程および第2の工程を有する。
第1の工程:一対の基板の間に本発明の硬化性樹脂組成物が収容され、減圧雰囲気下で密閉された積層前駆体を形成する。
第2の工程:前記減圧雰囲気よりも圧力が高い雰囲気下で前記積層前駆体の前記硬化性樹脂組成物を硬化させる。
減圧雰囲気下で硬化性樹脂組成物が密閉されて積層前駆体とされる範囲であれば、第1の工程における全ての作業を減圧雰囲気下で行う必要はない。たとえば、一方の基板上の周縁部に全周にわたってシール材を設け、該基板上の該シール材の内側に硬化性樹脂組成物を供給した後に他方の基板を重ねる場合は、他方の基板を重ねる前に減圧雰囲気とすれば、それよりも前の作業は大気圧雰囲気下で行ってもよい。また、硬化性樹脂組成物中における気泡の発生を抑制する点から、硬化性樹脂組成物を減圧雰囲気下に充分に曝してから前記他方の基板を重ねることが好ましい。
たとえば、感圧接着剤を使用することで、基板とシール材の密着強度を高めることができる。また、基板とシール材の界面に硬化性の接着剤を介在させ、積層前駆体を形成した後に該接着剤を硬化させることで、基板とシール材の密着強度を高めることができる。また、シール材を硬化性の樹脂で形成し、積層前駆体を形成した後にシール材自体を硬化させることでも、基板とシール材の密着強度を高めることができる。
シール材としては、たとえば、両面接着テープ等が挙げられる。
第1の工程における減圧雰囲気よりも高い圧力の雰囲気下で、前記積層前駆体における硬化性樹脂組成物を硬化させる。硬化性樹脂組成物が熱硬化性である場合は加熱することで硬化させ、硬化性樹脂組成物が光硬化性である場合は光照射によって硬化させる。光硬化は、紫外線ランプ等の光源から透明基板を通して光を照射することによって実施できる。硬化性樹脂組成物が硬化することで硬化樹脂層が形成され、積層体が得られる。
本発明の製造方法では、硬化性樹脂組成物に光重合開始剤(IV)を配合し、第2の工程において光照射によって硬化性樹脂組成物を硬化させることが好ましい。
第1の工程で形成された積層前駆体を、第2の工程において第1の工程の減圧雰囲気よりも高い圧力雰囲気下に置くと、基板の外側の圧力が内側の圧力よりも大きくなり、基板から硬化性樹脂組成物に圧力がかかる。また、硬化性樹脂組成物中の気泡の内部は第1の工程における減圧雰囲気の圧力にあることから、第2の工程で硬化性樹脂組成物にかかる圧力によって気泡の体積が縮小するか、または気泡内の気体が硬化性樹脂組成物に溶解することにより、気泡が消失する。
硬化性樹脂組成物中の気泡を充分に消失させるためには、第2の工程において、硬化性樹脂組成物を硬化させる前に、前記減圧雰囲気よりも高い圧力雰囲気下に積層前駆体をしばらく保持することが好ましい。保持時間は5分以上が好ましい。なお、気泡がない場合および気泡が微小で速やかに消失する場合等は、保持時間は5分未満であってもよい。
第1の工程および第2の工程における圧力雰囲気は、第1の工程で100Pa以下の圧力雰囲気とし、第2の工程で大気圧雰囲気とすることが特に好ましい。
第1の工程では、一方の透明基板10(以下、単に「基板10」と記す。)上の周縁部に全周にわたってシール材12を設け、シール材12上にシール用紫外線硬化性樹脂36を塗布し、シール材12に囲まれた基板10の表面に硬化性樹脂組成物14を供給して、硬化性樹脂組成物14の層を上にして減圧チャンバー26内に水平に載置する。また、減圧チャンバー26内においてシリンダー34によって上下しうる上定盤30に、他方の透明基板16(以下、単に「基板16」と記す。)を吸着パッド32によって保持し、基板10の上方で平行に対向させる。減圧チャンバー26を閉じ、真空ポンプ28を作動させて排気し、減圧チャンバー26内を所定の減圧雰囲気とする。その後、シリンダー34を作動させて基板16を降下させ、基板10と基板16によって硬化性樹脂組成物14の層を挟み、硬化性樹脂組成物14が基板10と基板16とシール材12によって密閉された積層前駆体を形成する。
第2の工程では、減圧チャンバー26内を大気圧雰囲気に戻し、減圧チャンバー26から前記積層前駆体を取り出し、大気圧雰囲気下において、前記積層前駆体の硬化性樹脂組成物を加熱または光照射によって硬化させ、積層体を得る。
なお、本発明の積層体は、前記した製造方法以外の公知の製造方法で製造したものでもよい。
[製造例1:ポリオール(A1-1)の製造]
撹拌機および窒素導入管を備えた耐圧反応器に、触媒(a13)である亜鉛へキサシアノコバルテート-tert-ブチルアルコール錯体の0.2g、および開始剤(a11)であるエクセノール-1020(旭硝子社製・ポリオキシプロピレングリコール(水酸基価112.2mgKOH/gから換算した分子量1000))の400gを仕込み、130℃の窒素雰囲気として、アルキレンオキサイド(a12)であるPOの3600gを一定の速度で加えながら7時間かけて投入した。その後、耐圧反応器の内圧の低下が止まったことを確認した後に生成物を抜き出し、水酸基価11.1mgKOH/g(水酸基価から換算した分子量:10108)のポリオキシプロピレングリコール(ポリオール(A1-1))の4000gを得た。
POの7200gを一定の速度で7時間かけて投入した以外は、製造例1と同様にして水酸基価6.3mgKOH/g(水酸基価から換算した分子量:17810)のポリオキシプロピレンポリオール(ポリオール(A1-2))を得た。
撹拌機および窒素導入管を備えた耐圧反応器内に、触媒である亜鉛へキサシアノコバルテート-グライム錯体の0.2g、および開始剤であるエクセノール-720(旭硝子社製・ポリオキシプロピレングリコール(水酸基価160.3mgKOH/gから換算した分子量:700))の700gを仕込み、130℃の窒素雰囲気下として、POの2340gを5時間反応させ、触媒を失活させた。その後、触媒として水酸化カリウムの12gを投入し、120℃で2時間脱水処理を行い、得られたポリオキシプロピレングリコールをアルコラート化後、EOの960gを反応させた。耐圧反応器から生成物を抜き出し、水酸基価28.7mgKOH/g(水酸基価から換算した分子量:3909)のポリオキシアルキレングリコール(ポリオール(X-1))を得た。
製造例1~3で得られたポリオールを表1に示す。「EO含有量」は、ポリオールにおける全オキシアルキレン基100質量%中のオキシエチレン基の割合である。
撹拌機および窒素導入管を備えた反応容器内に、製造例1で得たポリオール(A1-1)の1936.7g(0.192mol)、およびポリイソシアネート(A2)としてイソホロンジイソシアネート(以下、「IPDI」と記す。)の51.9g(0.233mol)を仕込み、ジオクチル錫ジステアレート(以下、「DOTDS」と記す。)の0.159gの存在下、70℃で10時間反応させ、イソシアネート基末端ウレタンプレポリマー(プレポリマー(A-1))を得た。ポリオール(A1-1)に対するIPDIの配合量はイソシアネートインデックスで121であった。プレポリマー(A-1)のイソシアネート基含有量は0.2429質量%であった。
プレポリマー(A-1)の1988.7g(イソシアネート基量:0.115mol)に、ジブチル錫ジラウレート(以下、「DBTDL」と記す。)の0.54g、2,5-ジ-tert-ブチルヒドロキノン(以下、「DtBHQ」と記す。)の0.6g、および化合物(B1)である2-ヒドロキシエチルアクリレート(以下、「HEA」と記す。)の13.4g(水酸基量:0.115mol)を加え、JIS K1603-1に則ったNCO滴定にてイソシアネート基含有率の測定を行いながら、イソシアネート基がなくなるまで反応を行い、表2に示すウレタンアクリレートオリゴマー(オリゴマー(I-1))を得た。前記反応における、プレポリマー(A-1)のイソシアネート基:化合物(B1)の水酸基のモル比は、1:1であった。
オリゴマー(I-1)の40g、単量体(II-1)である4-ヒドロキシブチルアクリレート(以下、「4HBA」と記す。)の30g、および単量体(III)であるラウリルアクリレート(以下、「LA」と記す。)の30gを混合し、さらに光重合開始剤(IV)として1-ヒドロキシシクロヘキシルフェニルケトン(以下、「HCHPK」と記す。)の3g、酸化防止剤としてIRGANOX-1010(BASF社製)の0.3g、および重合禁止剤としてDtBHQの0.04gを加えて混合し、硬化性樹脂組成物を調製した。
撹拌機および窒素導入管を備えた反応容器内に、製造例2で得たポリオール(A1-2)の491.0g(0.0273mol)、およびポリイソシアネート(A2)としてIPDIの7.4g(0.0333mol)を仕込み、DOTDSの0.0398gの存在下、70℃で3時間反応させ、イソシアネート基末端ウレタンプレポリマー(プレポリマー(A-2))を得た。ポリオール(A1-2)に対するIPDIの配合量はイソシアネートインデックスで122であった。プレポリマー(A-2)のイソシアネート基含有量は0.141質量%であった。
プレポリマー(A-2)の498.4g(イソシアネート基量:0.0167mol)に、DBTDLの0.14g、DtBHQの0.15g、および化合物(B1)であるHEAの1.94g(水酸基量:0.0167mol)を加え、実施例1と同様にして、表2に示すウレタンアクリレートオリゴマー(オリゴマー(I-2))を得た。
オリゴマー(I-1)の代わりにオリゴマー(I-2)を使用した以外は、実施例1と同様にして硬化性樹脂組成物を調製した。
撹拌機および窒素導入管を備えた反応容器内に、製造例3で得たポリオール(X-1)の460.3g(0.1177mol)、およびポリイソシアネートとしてIPDIの31.9g(0.143mol)を仕込み、DOTDSの0.039gの存在下、70℃で10時間反応させ、イソシアネート基末端ウレタンプレポリマー(プレポリマー(Y-1))を得た。ポリオール(X-1)に対するIPDIの配合量はイソシアネートインデックスで121であった。プレポリマー(Y-1)のイソシアネート基含有量は0.0319質量%であった。
プレポリマー(Y-1)の492.2g(イソシアネート基量:0.0559mol)に、DBTDLの0.135g、DtBHQの0.15g、および化合物(B1)であるHEAの6.5g(水酸基量:0.0559mol)を加え、実施例1と同様にして、表2に示すウレタンアクリレートオリゴマー(オリゴマー(Z-1))を得た。
オリゴマー(I-1)の代わりにオリゴマー(Z-1)を使用した以外は、実施例1と同様にして硬化性樹脂組成物を調製した。
オリゴマー(Z-1)の40g、4HBAの30g、LAの30gを混合し、さらに光重合開始剤としてHCHPKの3g、酸化防止剤としてIRGANOX-1010(BASF社製)の0.3g、重合禁止剤としてDtBHQの0.04g、および連鎖移動剤としてn-ドデカンチオールの0.4gを加えて混合し、硬化性樹脂組成物を調製した。
オリゴマー(Z-1)の40g、4HBAの30g、LAの30gを混合し、さらに光重合開始剤としてHCHPKの3g、酸化防止剤としてIRGANOX-1010(BASF社製)の0.3g、重合禁止剤としてDtBHQの0.04g、および連鎖移動剤としてn-ドデカンチオールの0.8g加えて混合し、硬化性樹脂組成物を調製した。
オリゴマー(I-1)の40g、2-ヒドロキシブチルメタクリレートの30g、ラウリルメタクリレートの30gを混合し、さらに光重合開始剤としてHCHPKの3g、酸化防止剤としてIRGANOX-1010(BASF社製)の0.3g、重合禁止剤としてDtBHQの0.04gを加えて混合し、硬化性樹脂組成物を調製した。
比較例4のオリゴマー(I-1)の代わりにオリゴマー(I-2)を使用した以外は比較例4と同様にして、硬化性樹脂組成物を調製した。
オリゴマー(I-1)、(I-2)およびオリゴマー(Z-1)の粘度を、E型粘度計(東機産業社製、RE-85U)を用いて25℃で測定した。
ソーダライムガラス板上に、各例で得られた硬化性樹脂組成物を0.4mm厚に塗布し、窒素流通下にて紫外線(光源:ウシオ電機社製水銀キセノンランプ、照度:400mW/cm2、積算光量:6000mJ/cm2)を照射して硬化させた。その後、AntonPaar社製レオメータMCR-301を用いて、硬化物の貯蔵弾性率を測定した。測定条件は、周波数1Hz、歪1%、温度35℃とした。
ソーダライムガラス板上に、各例で得られた硬化性樹脂組成物を0.1mm厚に塗布し、窒素流通下にて紫外線(光源:Fusion D-bulb メタルハライドランプ、照度:800mW/cm2、積算光量:500mJ/cm2)を照射した。紫外線照射後のサンプルをFT-IRにより測定し、以下の基準で硬化性を評価した。「○(良好)」:アクリル基の不飽和結合に起因する810cm-1の吸光度が、紫外線照射前の当該吸光度の5%未満である。「×(不良)」:アクリル基の不飽和結合に起因する810cm-1の吸光度が、紫外線照射前の当該吸光度の5%以上である。
厚さ2mmソーダライムガラス板上に、各例で得られた硬化性樹脂組成物を0.1mm厚で塗布し、さらにその上に厚さ2mmのソーダライムガラス板を重ね合わせて、積層サンプルを作成した。該積層サンプルに紫外線(光源:Fusion D-bulb メタルハライドランプ、照度:800mW/cm2、積算光量:500mJ/cm2)を照射した。紫外線照射後の積層サンプルを65℃、湿度93%の条件に放置し、500時間経過後に以下の基準で信頼性を評価した。「○(良好)」:積層サンプルに剥がれが見られない。「×(不良)」:積層サンプルに剥がれが見られる。
市販の7型液晶デジタルフォトフレーム(ソニー社製、DPF-0720)から液晶表示デバイスを取り出した。液晶表示デバイスは、表示モードがVA(Virtical Alignment)タイプで、表示部の大きさは、長さ88mm、幅156mmであった。液晶表示デバイスの両面には偏光板が貼合されており、長辺側のFPCの端部にはプリント配線板が接合されていた。該液晶表示デバイスを表示デバイスAとした。
表示デバイスAを、一対の定盤の昇降装置が設置されている減圧装置内の下定盤の上面に光硬化性樹脂組成物を形成させる面が上になるように平置した。
国際公開第2011/052747号の実施例と同様にして得られた、シール部形成用樹脂組成物Cを、表示デバイスAの外周の約5mmの位置の全周にわたって、幅約1mm、塗布厚さ約0.4mmとなるようにディスペンサにて塗布し、未硬化のシール部を形成した。ついで、未硬化のシール部の内側の領域に、実施例2の硬化性樹脂組成物(樹脂層形成用光硬化性樹脂組成物)を膜厚が200μmとなるように複数個所に供給した。
ガラス板Bを、表示デバイスAに対向するように、減圧装置内の昇降装置の上定盤の下面に設置した。また、ガラス板Bは、垂直方向では表示デバイスAとの距離が30mmとなるように保持させた。
減圧装置を密封状態として減圧装置内の圧力が約10Paとなるまで排気した。減圧装置内の昇降装置にて上下の定盤を接近させ、2kPaの圧力で圧着し、1分間保持させた。静電チャックを除電して上定盤からガラス板Bを離間させ、約15秒で減圧装置内を大気圧に戻し、表示デバイスA、ガラス板Bおよび未硬化のシール部で樹脂層形成用光硬化性樹脂組成物が密封された積層前駆体Dを得た。積層前駆体Dにおいて未硬化のシール部の形状は、ほぼ初期の状態のまま維持されていた。
積層前駆体Dに対して、ガラス板B側から紫外線(光源:Fusion D-bulb メタルハライドランプ、照度:800mW/cm2、積算光量:500mJ/cm2)を照射し、未硬化のシール部と樹脂層形成用光硬化性樹脂組成物を硬化させた。得られた表示装置を表示装置E1とした。
樹脂層形成用光硬化性樹脂組成物として実施例2の組成物の代わりに、比較例1、4、5の組成物を用いて、同様にして表示装置E2~E4を得た。
表示装置E1~E4を液晶表示デバイスを取り出した液晶モニターの筺体に戻し、配線を再接続した後に、ガラス板Bに接合された表示デバイスAが垂直になるように液晶モニターを設置した。5日間静置した後に電源を入れ、表示画像を評価した。「○(良好)」:画像が表示部全面にわたって均質。「×(不良)」:画像が表示部の一部に不均質(ムラあり)部分あり。
ヘイズは以下の方法で測定した。
4辺を厚さ0.2mm、幅5mmの両面テープで囲った100mm×100mm×2mmのソーダライムガラス板上に、厚さ200μmとなるような液量の実施例および比較例で調製した硬化性樹脂組成物を滴下した。続いて、その上に、100mm×100mm×2mmのソーダライムガラス板を、硬化性樹脂組成物に気泡が入らないように重ね合わせた。続いて、得られた重ね合わせサンプルを、ORC社製UVコンベア(製品名:QRM-2288、HgXeランプ)にて搬送し、照度100mW/cm2、積算光量3,000mJ/cm2の光を照射することで硬化物とし、これをヘイズ測定用の試料とした。
得られた試料のヘイズを日本電色社製色彩・濁度測定器(製品名:COH400)を用いて測定した。評価は以下の基準に従って行った。「○(良好)」:ヘイズ値が1.0%未満。「×(不良)」:ヘイズ値が1.0%以上。
4HBA:4-ヒドロキシブチルアクリレート。
LA:ラウリルアクリレート。
2-HBMA:2-ヒドロキシブチルメタクリレート。
LMA:ラウリルメタクリレート。
一方、水酸基価が大きいポリオールを使用して得たオリゴマー(Z-1)を含む硬化性樹脂組成物である比較例1では、硬化物の貯蔵弾性率が高いため、柔軟性が充分でなく、色ムラが生じており、信頼性にも劣っていた。
オリゴマー(Z-1)を含む硬化性樹脂組成物に少量の連鎖移動剤を配合した比較例2でも、硬化物の貯蔵弾性率が高いため、柔軟性が充分でない。また、信頼性にも劣っていた。
オリゴマー(Z-1)を含む硬化性樹脂組成物に充分な量の連鎖移動剤を配合した比較例3では、貯蔵弾性率が低く、柔軟な硬化物が形成されたが、硬化速度が遅かった。
また、オリゴマー(I-1)を用いているものの、単量体(II)を用いずにメタクリロイルオキシ基を有する単量体を用いた比較例4、5では、ヘイズ値が高く、実施例1、2と比べて透明性が劣っており、また色ムラも生じた。
なお、2012年12月14日に出願された日本特許出願2012-273563号および2013年4月26日に出願された日本特許出願2013-94659号の明細書、特許請求の範囲、図面および要約書の全内容をここに引用し、本発明の明細書の開示として、取り入れるものである。
Claims (15)
- 下記プレポリマー(A)と下記化合物(B)とを反応させて得られた不飽和ウレタンオリゴマー(I)、ならびに、下式(II-1)で表される単量体、下式(II-2)で表される単量体、下式(II-3)で表される単量体および下式(II-4)で表される単量体からなる群から選ばれる少なくとも1種の単量体(II)を含む硬化性樹脂組成物。
プレポリマー(A):下記ポリオール(A1)とポリイソシアネート(A2)とを、イソシアネートインデックスが100超160以下の条件で反応させて得られたイソシアネート基末端ウレタンプレポリマー。
ポリオール(A1):平均活性水素数が2~4の開始剤(a11)に炭素数3以上のアルキレンオキサイド(a12)を反応させて得られた、水酸基価3~13mgKOH/gのポリオキシアルキレンポリオール。
化合物(B):下記硬化性官能基と水酸基とを有する化合物。
硬化性官能基:CH2=C(R1)C(O)O-で表される基(ただし、R1は水素原子またはメチル基である。)。
mは1~3の整数である。
Q1は炭素数2~4のオキシアルキレン基であり、nは2~8の整数である。) - ポリイソシアネート(A2)が、脂環族系ポリイソシアネート、脂肪族系ポリイソシアネートおよびこれらを変性して得られる変性ポリイソシアネートからなる群から選ばれるポリイソシアネートである、請求項1に記載の硬化性樹脂組成物。
- 前記硬化性樹脂組成物中の前記不飽和ウレタンオリゴマー(I)の含有量が、20~75質量%である、請求項1~3のいずれか一項に記載の硬化性樹脂組成物。
- 前記硬化性樹脂組成物中の前記単量体(II)の含有量が、25~65質量%である、請求項1~4のいずれか一項に記載の硬化性樹脂組成物。
- 前記硬化性樹脂組成物中の前記式(III)で表される単量体の含有量が、35~50質量%である、請求項6に記載の硬化性樹脂組成物。
- 光重合開始剤(IV)をさらに含む、請求項1~7のいずれか一項に記載の硬化性樹脂組成物。
- 前記硬化性樹脂組成物が、一対の基板と該一対の基板の間に挟まれた硬化樹脂層とを有する積層体の製造における前記硬化樹脂層の形成に用いられる、請求項1~8のいずれか一項に記載の硬化性樹脂組成物。
- 一対の基板と該一対の基板の間に挟まれた硬化樹脂層とを有する積層体であって、
前記硬化樹脂層が、請求項1~8のいずれか一項に記載の硬化性樹脂組成物が硬化されてなる硬化樹脂の層である、積層体。 - 一対の基板の一方が表示デバイスかつ他方が透明な保護板であり、前記硬化樹脂層が前記表示デバイスの視認側に接している、請求項10に記載の積層体。
- 一対の基板の間に請求項1~8のいずれか一項に記載の硬化性樹脂組成物が収容され、減圧雰囲気下で密閉された積層前駆体を形成する第1の工程と、
前記減圧雰囲気よりも圧力が高い雰囲気下で前記積層前駆体の前記硬化性樹脂組成物を硬化させる第2の工程と、を有する、積層体の製造方法。 - 前記減圧雰囲気が100Pa以下の圧力雰囲気であり、前記減圧雰囲気よりも圧力が高い雰囲気が大気圧雰囲気である、請求項12に記載の積層体の製造方法。
- 前記一対の基板の少なくとも一方が透明な基板であり、前記第2の工程において前記硬化性樹脂組成物を光照射により硬化させる、請求項12または13に記載の積層体の製造方法。
- 一対の基板の一方が表示デバイスかつ他方が透明な保護板であり、前記表示デバイスの視認側と前記保護板との間に前記硬化性樹脂組成物を収容する、請求項12~14のいずれか一項に記載の積層体の製造方法。
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EP13863288.0A EP2933281A4 (en) | 2012-12-14 | 2013-12-05 | CURABLE RESIN COMPOSITION, LAMINATE USING THE SAME, AND MANUFACTURING METHOD THEREOF |
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CN201380065064.3A CN104936998A (zh) | 2012-12-14 | 2013-12-05 | 固化性树脂组合物、以及使用该固化性树脂组合物的层叠体及其制造方法 |
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JP6568081B2 (ja) | 2014-09-11 | 2019-08-28 | 積水化成品工業株式会社 | 高復元性樹脂粒子及びその用途 |
WO2020070924A1 (ja) * | 2018-10-03 | 2020-04-09 | 日立化成デュポンマイクロシステムズ株式会社 | 感光性樹脂組成物、パターン硬化物の製造方法、硬化物、層間絶縁膜、カバーコート層、表面保護膜及び電子部品 |
JP7415957B2 (ja) * | 2019-02-05 | 2024-01-17 | Agc株式会社 | 重合体、硬化性組成物、硬化物、粘着シート、積層体及びフレキシブルディスプレイ |
CN214188837U (zh) * | 2020-12-08 | 2021-09-14 | 惠州市开蒙医疗科技有限公司 | 一种紫外光固化设备 |
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TW201439136A (zh) | 2014-10-16 |
KR20150097501A (ko) | 2015-08-26 |
EP2933281A1 (en) | 2015-10-21 |
CN104936998A (zh) | 2015-09-23 |
US20150291725A1 (en) | 2015-10-15 |
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