JP7137440B2 - Film adhesives and adhesive sheets - Google Patents
Film adhesives and adhesive sheets Download PDFInfo
- Publication number
- JP7137440B2 JP7137440B2 JP2018207511A JP2018207511A JP7137440B2 JP 7137440 B2 JP7137440 B2 JP 7137440B2 JP 2018207511 A JP2018207511 A JP 2018207511A JP 2018207511 A JP2018207511 A JP 2018207511A JP 7137440 B2 JP7137440 B2 JP 7137440B2
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- Prior art keywords
- pressure
- sensitive adhesive
- copolymer
- mass
- group
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000000853 adhesive Substances 0.000 title description 78
- 230000001070 adhesive effect Effects 0.000 title description 78
- 239000004820 Pressure-sensitive adhesive Substances 0.000 claims description 77
- 229920001577 copolymer Polymers 0.000 claims description 59
- 239000003431 cross linking reagent Substances 0.000 claims description 27
- 125000000217 alkyl group Chemical group 0.000 claims description 18
- 239000000178 monomer Substances 0.000 claims description 17
- 125000004432 carbon atom Chemical group C* 0.000 claims description 11
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 claims description 10
- -1 alkyl methacrylate Chemical compound 0.000 claims description 10
- 125000000524 functional group Chemical group 0.000 claims description 10
- 229910052736 halogen Inorganic materials 0.000 claims description 10
- 150000002367 halogens Chemical class 0.000 claims description 10
- 125000004018 acid anhydride group Chemical group 0.000 claims description 9
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims description 9
- 150000002148 esters Chemical class 0.000 claims description 9
- 229920006254 polymer film Polymers 0.000 claims description 8
- 239000000758 substrate Substances 0.000 claims description 8
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 6
- 239000010410 layer Substances 0.000 claims description 6
- 125000005250 alkyl acrylate group Chemical group 0.000 claims description 4
- 150000001735 carboxylic acids Chemical class 0.000 claims description 4
- 239000012790 adhesive layer Substances 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims 1
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 18
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 18
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 18
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 15
- 238000000034 method Methods 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 14
- 239000004014 plasticizer Substances 0.000 description 14
- 229920005989 resin Polymers 0.000 description 12
- 239000011347 resin Substances 0.000 description 12
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 9
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 8
- 238000010528 free radical solution polymerization reaction Methods 0.000 description 8
- 239000000203 mixture Substances 0.000 description 8
- 239000003505 polymerization initiator Substances 0.000 description 8
- 238000006116 polymerization reaction Methods 0.000 description 8
- 239000002904 solvent Substances 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 7
- 230000014759 maintenance of location Effects 0.000 description 7
- 239000004800 polyvinyl chloride Substances 0.000 description 7
- 229920000915 polyvinyl chloride Polymers 0.000 description 7
- 150000003505 terpenes Chemical class 0.000 description 7
- 235000007586 terpenes Nutrition 0.000 description 7
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 description 6
- 239000004593 Epoxy Substances 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- WOBHKFSMXKNTIM-UHFFFAOYSA-N Hydroxyethyl methacrylate Chemical compound CC(=C)C(=O)OCCO WOBHKFSMXKNTIM-UHFFFAOYSA-N 0.000 description 4
- BAPJBEWLBFYGME-UHFFFAOYSA-N Methyl acrylate Chemical compound COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 description 4
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 4
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 4
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 4
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 4
- 239000012298 atmosphere Substances 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000035484 reaction time Effects 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- GOXQRTZXKQZDDN-UHFFFAOYSA-N 2-Ethylhexyl acrylate Chemical compound CCCCC(CC)COC(=O)C=C GOXQRTZXKQZDDN-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 3
- 235000014113 dietary fatty acids Nutrition 0.000 description 3
- 229930195729 fatty acid Natural products 0.000 description 3
- 239000000194 fatty acid Substances 0.000 description 3
- 238000005227 gel permeation chromatography Methods 0.000 description 3
- 239000012948 isocyanate Substances 0.000 description 3
- 150000002513 isocyanates Chemical class 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229920000058 polyacrylate Polymers 0.000 description 3
- 238000010992 reflux Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- OMIGHNLMNHATMP-UHFFFAOYSA-N 2-hydroxyethyl prop-2-enoate Chemical compound OCCOC(=O)C=C OMIGHNLMNHATMP-UHFFFAOYSA-N 0.000 description 2
- IRIAEXORFWYRCZ-UHFFFAOYSA-N Butylbenzyl phthalate Chemical compound CCCCOC(=O)C1=CC=CC=C1C(=O)OCC1=CC=CC=C1 IRIAEXORFWYRCZ-UHFFFAOYSA-N 0.000 description 2
- MQIUGAXCHLFZKX-UHFFFAOYSA-N Di-n-octyl phthalate Chemical compound CCCCCCCCOC(=O)C1=CC=CC=C1C(=O)OCCCCCCCC MQIUGAXCHLFZKX-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- 239000013032 Hydrocarbon resin Substances 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 2
- 150000008065 acid anhydrides Chemical class 0.000 description 2
- 239000001361 adipic acid Substances 0.000 description 2
- 235000011037 adipic acid Nutrition 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- DKPFZGUDAPQIHT-UHFFFAOYSA-N butyl acetate Chemical compound CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 description 2
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 description 2
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- CREMABGTGYGIQB-UHFFFAOYSA-N carbon carbon Chemical compound C.C CREMABGTGYGIQB-UHFFFAOYSA-N 0.000 description 2
- 239000011203 carbon fibre reinforced carbon Substances 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- DOIRQSBPFJWKBE-UHFFFAOYSA-N dibutyl phthalate Chemical compound CCCCOC(=O)C1=CC=CC=C1C(=O)OCCCC DOIRQSBPFJWKBE-UHFFFAOYSA-N 0.000 description 2
- SNRUBQQJIBEYMU-UHFFFAOYSA-N dodecane Chemical compound CCCCCCCCCCCC SNRUBQQJIBEYMU-UHFFFAOYSA-N 0.000 description 2
- GMSCBRSQMRDRCD-UHFFFAOYSA-N dodecyl 2-methylprop-2-enoate Chemical compound CCCCCCCCCCCCOC(=O)C(C)=C GMSCBRSQMRDRCD-UHFFFAOYSA-N 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000005338 heat storage Methods 0.000 description 2
- 229920006270 hydrocarbon resin Polymers 0.000 description 2
- PBOSTUDLECTMNL-UHFFFAOYSA-N lauryl acrylate Chemical compound CCCCCCCCCCCCOC(=O)C=C PBOSTUDLECTMNL-UHFFFAOYSA-N 0.000 description 2
- UAEPNZWRGJTJPN-UHFFFAOYSA-N methylcyclohexane Chemical compound CC1CCCCC1 UAEPNZWRGJTJPN-UHFFFAOYSA-N 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 2
- ANISOHQJBAQUQP-UHFFFAOYSA-N octyl prop-2-enoate Chemical compound CCCCCCCCOC(=O)C=C ANISOHQJBAQUQP-UHFFFAOYSA-N 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 2
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 2
- ARCGXLSVLAOJQL-UHFFFAOYSA-N trimellitic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C(C(O)=O)=C1 ARCGXLSVLAOJQL-UHFFFAOYSA-N 0.000 description 2
- RRLMGCBZYFFRED-UHFFFAOYSA-N undecyl prop-2-enoate Chemical compound CCCCCCCCCCCOC(=O)C=C RRLMGCBZYFFRED-UHFFFAOYSA-N 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- 239000003643 water by type Substances 0.000 description 2
- QEQBMZQFDDDTPN-UHFFFAOYSA-N (2-methylpropan-2-yl)oxy benzenecarboperoxoate Chemical compound CC(C)(C)OOOC(=O)C1=CC=CC=C1 QEQBMZQFDDDTPN-UHFFFAOYSA-N 0.000 description 1
- NALFRYPTRXKZPN-UHFFFAOYSA-N 1,1-bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane Chemical compound CC1CC(C)(C)CC(OOC(C)(C)C)(OOC(C)(C)C)C1 NALFRYPTRXKZPN-UHFFFAOYSA-N 0.000 description 1
- OUPZKGBUJRBPGC-UHFFFAOYSA-N 1,3,5-tris(oxiran-2-ylmethyl)-1,3,5-triazinane-2,4,6-trione Chemical compound O=C1N(CC2OC2)C(=O)N(CC2OC2)C(=O)N1CC1CO1 OUPZKGBUJRBPGC-UHFFFAOYSA-N 0.000 description 1
- AVTLBBWTUPQRAY-UHFFFAOYSA-N 2-(2-cyanobutan-2-yldiazenyl)-2-methylbutanenitrile Chemical compound CCC(C)(C#N)N=NC(C)(CC)C#N AVTLBBWTUPQRAY-UHFFFAOYSA-N 0.000 description 1
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical compound C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 description 1
- JAHNSTQSQJOJLO-UHFFFAOYSA-N 2-(3-fluorophenyl)-1h-imidazole Chemical compound FC1=CC=CC(C=2NC=CN=2)=C1 JAHNSTQSQJOJLO-UHFFFAOYSA-N 0.000 description 1
- PFHOSZAOXCYAGJ-UHFFFAOYSA-N 2-[(2-cyano-4-methoxy-4-methylpentan-2-yl)diazenyl]-4-methoxy-2,4-dimethylpentanenitrile Chemical compound COC(C)(C)CC(C)(C#N)N=NC(C)(C#N)CC(C)(C)OC PFHOSZAOXCYAGJ-UHFFFAOYSA-N 0.000 description 1
- WYGWHHGCAGTUCH-UHFFFAOYSA-N 2-[(2-cyano-4-methylpentan-2-yl)diazenyl]-2,4-dimethylpentanenitrile Chemical compound CC(C)CC(C)(C#N)N=NC(C)(C#N)CC(C)C WYGWHHGCAGTUCH-UHFFFAOYSA-N 0.000 description 1
- VFLMRWDNAYKKGN-UHFFFAOYSA-N 2-[3-[2-[bis(oxiran-2-ylmethyl)amino]ethyl]cyclohexyl]-n,n-bis(oxiran-2-ylmethyl)ethanamine Chemical compound C1CCC(CCN(CC2OC2)CC2OC2)CC1CCN(CC1OC1)CC1CO1 VFLMRWDNAYKKGN-UHFFFAOYSA-N 0.000 description 1
- VHSHLMUCYSAUQU-UHFFFAOYSA-N 2-hydroxypropyl methacrylate Chemical compound CC(O)COC(=O)C(C)=C VHSHLMUCYSAUQU-UHFFFAOYSA-N 0.000 description 1
- GWZMWHWAWHPNHN-UHFFFAOYSA-N 2-hydroxypropyl prop-2-enoate Chemical compound CC(O)COC(=O)C=C GWZMWHWAWHPNHN-UHFFFAOYSA-N 0.000 description 1
- OFNISBHGPNMTMS-UHFFFAOYSA-N 3-methylideneoxolane-2,5-dione Chemical compound C=C1CC(=O)OC1=O OFNISBHGPNMTMS-UHFFFAOYSA-N 0.000 description 1
- AHIPJALLQVEEQF-UHFFFAOYSA-N 4-(oxiran-2-ylmethoxy)-n,n-bis(oxiran-2-ylmethyl)aniline Chemical compound C1OC1COC(C=C1)=CC=C1N(CC1OC1)CC1CO1 AHIPJALLQVEEQF-UHFFFAOYSA-N 0.000 description 1
- YKXAYLPDMSGWEV-UHFFFAOYSA-N 4-hydroxybutyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OCCCCO YKXAYLPDMSGWEV-UHFFFAOYSA-N 0.000 description 1
- NDWUBGAGUCISDV-UHFFFAOYSA-N 4-hydroxybutyl prop-2-enoate Chemical compound OCCCCOC(=O)C=C NDWUBGAGUCISDV-UHFFFAOYSA-N 0.000 description 1
- GPZYYYGYCRFPBU-UHFFFAOYSA-N 6-Hydroxyflavone Chemical compound C=1C(=O)C2=CC(O)=CC=C2OC=1C1=CC=CC=C1 GPZYYYGYCRFPBU-UHFFFAOYSA-N 0.000 description 1
- XFOFBPRPOAWWPA-UHFFFAOYSA-N 6-hydroxyhexyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OCCCCCCO XFOFBPRPOAWWPA-UHFFFAOYSA-N 0.000 description 1
- OCIFJWVZZUDMRL-UHFFFAOYSA-N 6-hydroxyhexyl prop-2-enoate Chemical compound OCCCCCCOC(=O)C=C OCIFJWVZZUDMRL-UHFFFAOYSA-N 0.000 description 1
- NQSLZEHVGKWKAY-UHFFFAOYSA-N 6-methylheptyl 2-methylprop-2-enoate Chemical compound CC(C)CCCCCOC(=O)C(C)=C NQSLZEHVGKWKAY-UHFFFAOYSA-N 0.000 description 1
- DXPPIEDUBFUSEZ-UHFFFAOYSA-N 6-methylheptyl prop-2-enoate Chemical compound CC(C)CCCCCOC(=O)C=C DXPPIEDUBFUSEZ-UHFFFAOYSA-N 0.000 description 1
- YPMOAQISONSSNL-UHFFFAOYSA-N 8-hydroxyoctyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OCCCCCCCCO YPMOAQISONSSNL-UHFFFAOYSA-N 0.000 description 1
- JSCDRVVVGGYHSN-UHFFFAOYSA-N 8-hydroxyoctyl prop-2-enoate Chemical compound OCCCCCCCCOC(=O)C=C JSCDRVVVGGYHSN-UHFFFAOYSA-N 0.000 description 1
- COCLLEMEIJQBAG-UHFFFAOYSA-N 8-methylnonyl 2-methylprop-2-enoate Chemical compound CC(C)CCCCCCCOC(=O)C(C)=C COCLLEMEIJQBAG-UHFFFAOYSA-N 0.000 description 1
- LVGFPWDANALGOY-UHFFFAOYSA-N 8-methylnonyl prop-2-enoate Chemical compound CC(C)CCCCCCCOC(=O)C=C LVGFPWDANALGOY-UHFFFAOYSA-N 0.000 description 1
- 239000004342 Benzoyl peroxide Substances 0.000 description 1
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical compound C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 description 1
- 102100026735 Coagulation factor VIII Human genes 0.000 description 1
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 description 1
- 239000004803 Di-2ethylhexylphthalate Substances 0.000 description 1
- ZVFDTKUVRCTHQE-UHFFFAOYSA-N Diisodecyl phthalate Chemical compound CC(C)CCCCCCCOC(=O)C1=CC=CC=C1C(=O)OCCCCCCCC(C)C ZVFDTKUVRCTHQE-UHFFFAOYSA-N 0.000 description 1
- 239000005057 Hexamethylene diisocyanate Substances 0.000 description 1
- 101000911390 Homo sapiens Coagulation factor VIII Proteins 0.000 description 1
- 239000005058 Isophorone diisocyanate Substances 0.000 description 1
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 description 1
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- KWYHDKDOAIKMQN-UHFFFAOYSA-N N,N,N',N'-tetramethylethylenediamine Chemical compound CN(C)CCN(C)C KWYHDKDOAIKMQN-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
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- KRADHMIOFJQKEZ-UHFFFAOYSA-N Tri-2-ethylhexyl trimellitate Chemical compound CCCCC(CC)COC(=O)C1=CC=C(C(=O)OCC(CC)CCCC)C(C(=O)OCC(CC)CCCC)=C1 KRADHMIOFJQKEZ-UHFFFAOYSA-N 0.000 description 1
- KYIKRXIYLAGAKQ-UHFFFAOYSA-N abcn Chemical compound C1CCCCC1(C#N)N=NC1(C#N)CCCCC1 KYIKRXIYLAGAKQ-UHFFFAOYSA-N 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
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- 150000001338 aliphatic hydrocarbons Chemical class 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 125000003368 amide group Chemical group 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 125000001204 arachidyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 229920006272 aromatic hydrocarbon resin Polymers 0.000 description 1
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- 230000015572 biosynthetic process Effects 0.000 description 1
- WPKWPKDNOPEODE-UHFFFAOYSA-N bis(2,4,4-trimethylpentan-2-yl)diazene Chemical compound CC(C)(C)CC(C)(C)N=NC(C)(C)CC(C)(C)C WPKWPKDNOPEODE-UHFFFAOYSA-N 0.000 description 1
- SAOKZLXYCUGLFA-UHFFFAOYSA-N bis(2-ethylhexyl) adipate Chemical compound CCCCC(CC)COC(=O)CCCCC(=O)OCC(CC)CCCC SAOKZLXYCUGLFA-UHFFFAOYSA-N 0.000 description 1
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 description 1
- OHJMTUPIZMNBFR-UHFFFAOYSA-N biuret Chemical compound NC(=O)NC(N)=O OHJMTUPIZMNBFR-UHFFFAOYSA-N 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000012662 bulk polymerization Methods 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- HNEGQIOMVPPMNR-IHWYPQMZSA-N citraconic acid Chemical compound OC(=O)C(/C)=C\C(O)=O HNEGQIOMVPPMNR-IHWYPQMZSA-N 0.000 description 1
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- 238000007334 copolymerization reaction Methods 0.000 description 1
- LDHQCZJRKDOVOX-NSCUHMNNSA-N crotonic acid Chemical compound C\C=C\C(O)=O LDHQCZJRKDOVOX-NSCUHMNNSA-N 0.000 description 1
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- 125000002704 decyl 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])* 0.000 description 1
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- 238000006460 hydrolysis reaction Methods 0.000 description 1
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- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
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- 239000011976 maleic acid Substances 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- 125000002960 margaryl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- ZQMHJBXHRFJKOT-UHFFFAOYSA-N methyl 2-[(1-methoxy-2-methyl-1-oxopropan-2-yl)diazenyl]-2-methylpropanoate Chemical compound COC(=O)C(C)(C)N=NC(C)(C)C(=O)OC ZQMHJBXHRFJKOT-UHFFFAOYSA-N 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- GYNNXHKOJHMOHS-UHFFFAOYSA-N methyl-cycloheptane Natural products CC1CCCCCC1 GYNNXHKOJHMOHS-UHFFFAOYSA-N 0.000 description 1
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 125000001421 myristyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- MUMVIYLVHVCYGI-UHFFFAOYSA-N n,n,n',n',n",n"-hexamethylmethanetriamine Chemical compound CN(C)C(N(C)C)N(C)C MUMVIYLVHVCYGI-UHFFFAOYSA-N 0.000 description 1
- SJPFBRJHYRBAGV-UHFFFAOYSA-N n-[[3-[[bis(oxiran-2-ylmethyl)amino]methyl]phenyl]methyl]-1-(oxiran-2-yl)-n-(oxiran-2-ylmethyl)methanamine Chemical compound C1OC1CN(CC=1C=C(CN(CC2OC2)CC2OC2)C=CC=1)CC1CO1 SJPFBRJHYRBAGV-UHFFFAOYSA-N 0.000 description 1
- 125000004108 n-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000004123 n-propyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 125000001196 nonadecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- LKEDKQWWISEKSW-UHFFFAOYSA-N nonyl 2-methylprop-2-enoate Chemical compound CCCCCCCCCOC(=O)C(C)=C LKEDKQWWISEKSW-UHFFFAOYSA-N 0.000 description 1
- 125000001400 nonyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- MDYPDLBFDATSCF-UHFFFAOYSA-N nonyl prop-2-enoate Chemical compound CCCCCCCCCOC(=O)C=C MDYPDLBFDATSCF-UHFFFAOYSA-N 0.000 description 1
- NZIDBRBFGPQCRY-UHFFFAOYSA-N octyl 2-methylprop-2-enoate Chemical compound CCCCCCCCOC(=O)C(C)=C NZIDBRBFGPQCRY-UHFFFAOYSA-N 0.000 description 1
- 229940065472 octyl acrylate Drugs 0.000 description 1
- 125000002347 octyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 235000019198 oils Nutrition 0.000 description 1
- 125000000913 palmityl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000002958 pentadecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 1
- 125000001147 pentyl group Chemical group C(CCCC)* 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- JQCXWCOOWVGKMT-UHFFFAOYSA-N phthalic acid diheptyl ester Natural products CCCCCCCOC(=O)C1=CC=CC=C1C(=O)OCCCCCCC JQCXWCOOWVGKMT-UHFFFAOYSA-N 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920001515 polyalkylene glycol Chemical class 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- BOQSSGDQNWEFSX-UHFFFAOYSA-N propan-2-yl 2-methylprop-2-enoate Chemical compound CC(C)OC(=O)C(C)=C BOQSSGDQNWEFSX-UHFFFAOYSA-N 0.000 description 1
- NHARPDSAXCBDDR-UHFFFAOYSA-N propyl 2-methylprop-2-enoate Chemical compound CCCOC(=O)C(C)=C NHARPDSAXCBDDR-UHFFFAOYSA-N 0.000 description 1
- 125000002914 sec-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000003549 soybean oil Substances 0.000 description 1
- 235000012424 soybean oil Nutrition 0.000 description 1
- 125000004079 stearyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000010558 suspension polymerization method Methods 0.000 description 1
- 239000003784 tall oil Substances 0.000 description 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- CIHOLLKRGTVIJN-UHFFFAOYSA-N tert‐butyl hydroperoxide Chemical compound CC(C)(C)OO CIHOLLKRGTVIJN-UHFFFAOYSA-N 0.000 description 1
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 description 1
- LDHQCZJRKDOVOX-UHFFFAOYSA-N trans-crotonic acid Natural products CC=CC(O)=O LDHQCZJRKDOVOX-UHFFFAOYSA-N 0.000 description 1
- 125000002889 tridecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000005590 trimellitic acid group Chemical group 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 1
- 125000002948 undecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 229920001567 vinyl ester resin Polymers 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- PAPBSGBWRJIAAV-UHFFFAOYSA-N ε-Caprolactone Chemical class O=C1CCCCCO1 PAPBSGBWRJIAAV-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Adhesive Tapes (AREA)
- Adhesives Or Adhesive Processes (AREA)
Description
本発明は、フィルム用粘着剤および粘着シートに関する。 TECHNICAL FIELD The present invention relates to an adhesive for films and an adhesive sheet.
粘着剤およびそれを用いた粘着シートは、産業上の種々の分野において広範に用いられている。前記粘着シートは、例えば、基材フィルム上に、前記粘着剤を含む粘着剤層を設けて得られる（特許文献１等）。 Adhesives and adhesive sheets using them are widely used in various industrial fields. The pressure-sensitive adhesive sheet is obtained, for example, by providing a pressure-sensitive adhesive layer containing the pressure-sensitive adhesive on a base film (Patent Document 1, etc.).
粘着剤および粘着シートは、特に高温環境下で、長時間経過による接着力（粘着力）の経時的低下が問題となるおそれがある。したがって、高温環境下でも接着力の経時的低下が起こりにくい粘着剤および粘着シートが必要とされる。 The pressure-sensitive adhesive and pressure-sensitive adhesive sheet may pose a problem of deterioration in adhesive strength (adhesive strength) over time, especially in a high-temperature environment. Therefore, a pressure-sensitive adhesive and a pressure-sensitive adhesive sheet are required that are less likely to deteriorate in adhesive strength over time even in a high-temperature environment.
そこで、本発明は、高温環境下でも接着力の経時的低下が起こりにくいフィルム用粘着剤および粘着シートを提供することを目的とする。 Accordingly, an object of the present invention is to provide a pressure-sensitive adhesive for films and a pressure-sensitive adhesive sheet whose adhesive strength is less likely to decrease over time even in a high-temperature environment.
前記目的を達成するために、本発明のフィルム用粘着剤は、少なくとも下記成分（ａ）３０～９０質量部、下記成分（ｂ）１５～３０質量部および下記成分（ｃ）の共重合体（Ａ）を含み、前記共重合体（Ａ）の重量平均分子量が１０万～４０万であることを特徴とする。
（ａ）炭素数８～１２のアルキル基を有するアクリル酸アルキルエステルおよび炭素数８～１２のアルキル基を有するメタクリル酸アルキルエステルの少なくとも一方
（ｂ）炭素数１～３のアルキル基を有するメタクリル酸アルキルエステル
（ｃ）架橋性官能基を有するモノマー
In order to achieve the above object, the film pressure-sensitive adhesive of the present invention comprises at least 30 to 90 parts by mass of component (a) below, 15 to 30 parts by mass of component (b) below and a copolymer of component (c) below ( A), wherein the copolymer (A) has a weight average molecular weight of 100,000 to 400,000.
(a) at least one of an alkyl acrylate having an alkyl group of 8 to 12 carbon atoms and an alkyl methacrylate having an alkyl group of 8 to 12 carbon atoms (b) methacrylic acid having an alkyl group of 1 to 3 carbon atoms Alkyl ester (c) monomer having a crosslinkable functional group
本発明の粘着シートは、フィルム製基材と、粘着剤層とを含み、前記粘着剤層が、本発明のフィルム用粘着剤を含むことを特徴とする。 The pressure-sensitive adhesive sheet of the present invention comprises a film substrate and a pressure-sensitive adhesive layer, wherein the pressure-sensitive adhesive layer contains the film pressure-sensitive adhesive of the present invention.
本発明によれば、高温環境下でも接着力の経時的低下が起こりにくいフィルム用粘着剤および粘着シートを提供することができる。 ADVANTAGE OF THE INVENTION According to this invention, the pressure-sensitive adhesive for films and the pressure-sensitive adhesive sheet which are hard to fall in adhesive force with time even in a high temperature environment can be provided.
以下、本発明について、例をあげて説明する。ただし、本発明は、以下の説明により限定されない。 The present invention will now be described with reference to examples. However, the invention is not limited by the following description.
本発明のフィルム用粘着剤は、例えば、さらに、架橋剤（Ｂ）を含み、前記架橋剤（Ｂ）の含有率が、前記共重合体（Ａ）の１．５質量％以下であってもよい。 The pressure-sensitive adhesive for films of the present invention, for example, further includes a cross-linking agent (B), and the content of the cross-linking agent (B) is 1.5% by mass or less of the copolymer (A). good.
本発明のフィルム用粘着剤は、例えば、ハロゲン含有ポリマー製フィルム用であってもよい。 The adhesive for films of the present invention may be for films made of halogen-containing polymers, for example.
本発明のフィルム用粘着剤は、例えば、前記成分（ｃ）における前記架橋性官能基が、水酸基、カルボキシ基および酸無水物基からなる群から選択される少なくとも一つであってもよい。 In the pressure-sensitive adhesive for film of the present invention, for example, the crosslinkable functional group in the component (c) may be at least one selected from the group consisting of a hydroxyl group, a carboxyl group and an acid anhydride group.
本発明のフィルム用粘着剤は、例えば、前記共重合体（Ａ）の共重合成分が、さらに、下記成分（ｄ）を含んでいてもよい。
（ｄ）カルボン酸の不飽和エステル
In the pressure-sensitive adhesive for films of the present invention, for example, the copolymer component of the copolymer (A) may further contain the following component (d).
(d) unsaturated esters of carboxylic acids
本発明のフィルム用粘着剤は、例えば、前記共重合体（Ａ）の共重合成分において、前記成分（ｃ）の含有量が０．０５～４．０質量部であってもよい。 In the film pressure-sensitive adhesive of the present invention, for example, the content of the component (c) in the copolymer component of the copolymer (A) may be 0.05 to 4.0 parts by mass.
本発明の粘着シートは、例えば、前記フィルム製基材が、ハロゲン含有ポリマー製フィルムであってもよい。 In the adhesive sheet of the present invention, for example, the film substrate may be a halogen-containing polymer film.
本発明において、「初期接着力」は、粘着シートを被着体に接着させた直後の接着力をいい、すなわち、接着後の接着力の経時変化を考慮しない接着力をいう。本発明において、粘着剤または粘着シートの初期接着力の測定方法は、特に限定されないが、例えば、後述する実施例に記載の測定方法で測定できる。 In the present invention, the "initial adhesive strength" refers to the adhesive strength immediately after the pressure-sensitive adhesive sheet is adhered to the adherend, that is, the adhesive strength without considering the change over time of the adhesive strength after adhesion. In the present invention, the method for measuring the initial adhesive strength of the pressure-sensitive adhesive or pressure-sensitive adhesive sheet is not particularly limited.
本発明において、「接着力」と「粘着力」とは、特に区別はなく、同義であるものとする。本発明において、「接着剤」と「粘着剤」とは、特に区別はなく、同義であるものとする。本発明において、「粘着剤組成物」は、粘着剤のうち、組成物であるものをいう。 In the present invention, the terms "adhesive strength" and "adhesive strength" are not particularly distinguished and have the same meaning. In the present invention, the terms "adhesive" and "adhesive" are synonymous without any particular distinction. In the present invention, the “adhesive composition” refers to adhesives that are compositions.
一般に、厚みが比較的大きいものを「シート」、厚みが小さいものを「フィルム」と呼んで区別する場合があるが、本発明では、「シート」と「フィルム」とは特に区別はなく同義であるものとする。 In general, a material having a relatively large thickness is called a "sheet" and a material having a small thickness is sometimes called a "film" for distinction. Assume that there is
本発明において、「アルキル」は、例えば、直鎖状または分枝状のアルキルを含む。本発明において、アルキル基は、特に限定されないが、例えば、メチル基、エチル基、n-プロピル基、イソプロピル基、n-ブチル基、イソブチル基、sec-ブチル基およびtert-ブチル基、ペンチル基、ヘキシル基、ヘプチル基、オクチル基、ノニル基、デシル基、ウンデシル基、ドデシル基、トリデシル基、テトラデシル基、ペンタデシル基、ヘキサデシル基、ヘプタデシル基、オクタデシル基、ノナデシル基、イコシル基等があげられる。 In the present invention, "alkyl" includes, for example, linear or branched alkyl. In the present invention, the alkyl group is not particularly limited, but examples include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, sec-butyl group and tert-butyl group, pentyl group, Hexyl group, heptyl group, octyl group, nonyl group, decyl group, undecyl group, dodecyl group, tridecyl group, tetradecyl group, pentadecyl group, hexadecyl group, heptadecyl group, octadecyl group, nonadecyl group, icosyl group and the like.
以下、本発明の実施形態について、さらに具体的に説明する。ただし、本発明は、以下の実施形態に限定されない。 Hereinafter, embodiments of the present invention will be described more specifically. However, the present invention is not limited to the following embodiments.
［１．粘着剤］
本発明のフィルム用粘着剤は、前述のとおり、少なくとも下記成分（ａ）３０～９０質量部、下記成分（ｂ）１５～３０質量部および下記成分（ｃ）の共重合体（Ａ）を含み、前記共重合体（Ａ）の重量平均分子量が１０万～４０万であることを特徴とする。
（ａ）炭素数８～１２のアルキル基を有するアクリル酸アルキルエステルおよび炭素数８～１２のアルキル基を有するメタクリル酸アルキルエステルの少なくとも一方
（ｂ）炭素数１～３のアルキル基を有するメタクリル酸アルキルエステル
（ｃ）架橋性官能基を有するモノマー
[1. Adhesive]
As described above, the pressure-sensitive adhesive for films of the present invention contains at least 30 to 90 parts by mass of the following component (a), 15 to 30 parts by mass of the following component (b), and a copolymer (A) of the following component (c). , wherein the copolymer (A) has a weight average molecular weight of 100,000 to 400,000.
(a) at least one of an alkyl acrylate having an alkyl group of 8 to 12 carbon atoms and an alkyl methacrylate having an alkyl group of 8 to 12 carbon atoms (b) methacrylic acid having an alkyl group of 1 to 3 carbon atoms Alkyl ester (c) monomer having a crosslinkable functional group
［１－１．共重合体（Ａ）］
共重合体（Ａ）は、前述のとおり、少なくとも前記成分（ａ）、（ｂ）および（ｃ）の共重合体である。
[1-1. Copolymer (A)]
Copolymer (A) is, as described above, a copolymer of at least the components (a), (b) and (c).
成分（ａ）は、前述のとおり、炭素数８～１２のアルキル基を有するアクリル酸アルキルエステルおよび炭素数８～１２のアルキル基を有するメタクリル酸アルキルエステルの少なくとも一方である。成分（ａ）としては、例えば、アクリル酸２－エチルヘキシル、アクリル酸ノルマルオクチル、アクリル酸イソオクチル、アクリル酸ラウリル、アクリル酸ノニル、アクリル酸デシル、アクリル酸イソデシル、アクリル酸ウンデシル、アクリル酸ドデシル、メタクリル酸２－エチルヘキシル、メタクリル酸ノルマルオクチル、メタクリル酸イソオクチル、メタクリル酸ラウリル、メタクリル酸ノニル、メタクリル酸デシル、メタクリル酸イソデシル、アクリル酸ウンデシル、メタクリル酸ドデシル等があげられ、１種類のみ用いても２種類以上併用してもよい。 Component (a) is, as described above, at least one of an alkyl acrylate having an alkyl group of 8 to 12 carbon atoms and an alkyl methacrylate ester having an alkyl group of 8 to 12 carbon atoms. Examples of component (a) include 2-ethylhexyl acrylate, normal octyl acrylate, isooctyl acrylate, lauryl acrylate, nonyl acrylate, decyl acrylate, isodecyl acrylate, undecyl acrylate, dodecyl acrylate, and methacrylic acid. 2-ethylhexyl, normal octyl methacrylate, isooctyl methacrylate, lauryl methacrylate, nonyl methacrylate, decyl methacrylate, isodecyl methacrylate, undecyl acrylate, dodecyl methacrylate, etc., and even if only one type is used, two or more types are used. They may be used together.
共重合体（Ａ）の共重合成分中における成分（ａ）の含有量は、前述のとおり、３０～９０質量部であり、例えば、４０～８０質量部であってもよい。３０質量部未満または９０質量部を超える含有量では、高温環境下における接着力の経時的低下が大きくなる。 The content of component (a) in the copolymer component of copolymer (A) is, as described above, 30 to 90 parts by mass, and may be, for example, 40 to 80 parts by mass. If the content is less than 30 parts by mass or more than 90 parts by mass, the adhesive strength will decrease significantly over time in a high-temperature environment.
成分（ｂ）は、前述のとおり、炭素数１～３のアルキル基を有するメタクリル酸アルキルエステルである。前記アルキル基は、直鎖状でも分枝状でもよい。成分（ｂ）としては、例えば、メタクリル酸メチル、メタクリル酸エチル、メタクリル酸ｎ－プロピル、メタクリル酸イソプロピルがあげられ、１種類のみ用いても２種類以上併用してもよい。 Component (b) is, as described above, a methacrylic acid alkyl ester having an alkyl group of 1 to 3 carbon atoms. Said alkyl group may be linear or branched. Component (b) includes, for example, methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, and isopropyl methacrylate, and may be used alone or in combination of two or more.
共重合体（Ａ）の共重合成分中における成分（ｂ）の含有量は、前述のとおり、１５～３０質量部である。１５質量部未満では、高温環境下における接着力の経時的低下が大きくなる。また、３０質量部を超えると、初期接着力が低くなる。 The content of component (b) in the copolymer component of copolymer (A) is, as described above, 15 to 30 parts by mass. If the content is less than 15 parts by mass, the adhesive strength will decrease significantly over time in a high temperature environment. Moreover, when it exceeds 30 mass parts, initial adhesive strength will become low.
成分（ｃ）は、前述のとおり、架橋性官能基を有するモノマーである。前記架橋性官能基は、特に限定されないが、例えば、水酸基、カルボキシ基、酸無水物基、グリシジル基、アミノ基、アミド基等があげられ、１種類のみ用いても２種類以上併用してもよい。前記架橋性官能基は、例えば、前述のとおり、水酸基、カルボキシ基および酸無水物基からなる群から選択される少なくとも一つであってもよい。水酸基を有するモノマーとしては、例えば、アクリル酸またはメタクリル酸のヒドロキシアルキルエステル、アクリル酸またはメタクリル酸のヒドロキシエステルのカプロラクトン付加物、アクリル酸またはメタクリル酸のポリアルキレングリコールエステル等があげられる。前記アクリル酸またはメタクリル酸のヒドロキシアルキルエステルにおいて、前記アルキル基は、直鎖状でも分枝状でもよく、炭素数は、例えば、１～８であってもよい。前記アクリル酸のヒドロキシアルキルエステルとしては、特に限定されないが、例えば、アクリル酸２－ヒドロキシエチル、アクリル酸２－ヒドロキシプロピル、アクリル酸４－ヒドロキシブチル、アクリル酸２－ヒドロキシエチル、アクリル酸３－ヒドロキシブチル、アクリル酸８－ヒドロキシオクチル、アクリル酸６－ヒドロキシヘキシル等があげられる。前記メタクリル酸のヒドロキシアルキルエステルとしては、特に限定されないが、例えば、メタクリル酸２－ヒドロキシエチル、メタクリル酸２－ヒドロキシプロピル、メタクリル酸４－ヒドロキシブチル、メタクリル酸２－ヒドロキシエチル、メタクリル酸３－ヒドロキシブチル、メタクリル酸８－ヒドロキシオクチル、メタクリル酸６－ヒドロキシヘキシル等があげられる。カルボキシ基を有するモノマーとしては、特に限定されないが、例えば、不飽和カルボン酸（炭素－炭素不飽和結合を有するカルボン酸）等があげられる。前記カルボキシ基を有するモノマーは、例えば、アクリル酸、メタクリル酸、イタコン酸、マレイン酸、フマル酸、クロトン酸、シトラコン酸等があげられる。酸無水物基を有するモノマー（すなわち酸無水物）は、酸無水物基が加水分解によりカルボキシ基２個を生じ、そのカルボキシ基２個が前記架橋性官能基として働く。したがって、前記酸無水物基を有するモノマーは、実質的に、カルボキシ基２個を有するモノマーと同じである。前記酸無水物基を有するモノマーとしては、特に限定されないが、例えば、炭素－炭素不飽和結合を有する酸無水物があげられる。前記酸無水物基を有するモノマーとしては、例えば、無水イタコン酸、無水マレイン酸等があげられる。また、成分（ｃ）において、前記架橋性官能基を有するモノマーは、１種類のみ用いても２種類以上併用してもよい。 Component (c) is a monomer having a crosslinkable functional group, as described above. The crosslinkable functional group is not particularly limited, but includes, for example, a hydroxyl group, a carboxyl group, an acid anhydride group, a glycidyl group, an amino group, an amide group, and the like. good. The crosslinkable functional group may be, for example, at least one selected from the group consisting of a hydroxyl group, a carboxyl group and an acid anhydride group, as described above. Examples of the hydroxyl group-containing monomer include hydroxyalkyl esters of acrylic acid or methacrylic acid, caprolactone adducts of hydroxy esters of acrylic acid or methacrylic acid, and polyalkylene glycol esters of acrylic acid or methacrylic acid. In the hydroxyalkyl ester of acrylic acid or methacrylic acid, the alkyl group may be linear or branched, and may have, for example, 1 to 8 carbon atoms. Examples of the hydroxyalkyl ester of acrylic acid include, but are not limited to, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 4-hydroxybutyl acrylate, 2-hydroxyethyl acrylate, and 3-hydroxy acrylate. butyl, 8-hydroxyoctyl acrylate, 6-hydroxyhexyl acrylate, and the like. The hydroxyalkyl ester of methacrylic acid is not particularly limited, but examples include 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, 4-hydroxybutyl methacrylate, 2-hydroxyethyl methacrylate, and 3-hydroxy methacrylate. butyl, 8-hydroxyoctyl methacrylate, 6-hydroxyhexyl methacrylate and the like. The monomer having a carboxy group is not particularly limited, but examples thereof include unsaturated carboxylic acids (carboxylic acids having a carbon-carbon unsaturated bond). Examples of the monomer having a carboxy group include acrylic acid, methacrylic acid, itaconic acid, maleic acid, fumaric acid, crotonic acid, citraconic acid and the like. A monomer having an acid anhydride group (that is, an acid anhydride) produces two carboxy groups by hydrolysis of the acid anhydride group, and the two carboxy groups act as the crosslinkable functional groups. Therefore, the monomer having an acid anhydride group is substantially the same as the monomer having two carboxy groups. The monomer having an acid anhydride group is not particularly limited, but includes, for example, acid anhydrides having a carbon-carbon unsaturated bond. Examples of the monomer having an acid anhydride group include itaconic anhydride and maleic anhydride. Moreover, in the component (c), the monomer having the crosslinkable functional group may be used alone or in combination of two or more.
共重合体（Ａ）の共重合成分中における成分（ｃ）の含有量は、特に限定されないが、例えば、０．０５～４．０質量部であってもよく、０．１～３．０質量部であってもよい。成分（ｃ）の含有量がこの範囲内であると、さらに、接着力の経時的低下が抑制されやすくなる。 The content of component (c) in the copolymer component of copolymer (A) is not particularly limited, but may be, for example, 0.05 to 4.0 parts by mass, or 0.1 to 3.0 parts by mass. It may be parts by mass. When the content of the component (c) is within this range, the decrease in adhesive strength over time is more likely to be suppressed.
また、共重合体（Ａ）の共重合成分は、成分（ａ）～（ｃ）以外の任意成分を含んでいてもよいし、含んでいなくてもよい。前記任意成分としては、特に限定されないが、例えば、前記成分（ｄ）すなわちカルボン酸の不飽和エステルがあげられる。前記成分（ｄ）としては、特に限定されないが、例えば、カルボン酸アルケニルエステル、カルボン酸ビニルエステル等があげられ、より具体的には、例えば、酢酸ビニル、プロピオン酸ビニル、酪酸ビニルカプロン酸ビニル、カプリル酸ビニル、ラウリン酸ビニル、パルミチン酸ビニル、ステアリン酸ビニル、オクチル酸ビニル、ビバリン酸ビニル等があげられ、１種類のみ用いても２種類以上併用してもよい。 Further, the copolymer components of the copolymer (A) may or may not contain optional components other than the components (a) to (c). Examples of the optional component include, but are not particularly limited to, the component (d), that is, the unsaturated ester of carboxylic acid. Examples of the component (d) include, but are not limited to, carboxylic acid alkenyl esters and carboxylic acid vinyl esters. More specifically, examples include vinyl acetate, vinyl propionate, vinyl butyrate, vinyl caproate, Examples thereof include vinyl caprylate, vinyl laurate, vinyl palmitate, vinyl stearate, vinyl octylate, vinyl bivalate, and the like, and may be used alone or in combination of two or more.
共重合体（Ａ）の共重合成分中における成分（ｄ）の含有量は、特に限定されないが、例えば、０．５～４０質量部、１～４０質量部、１～３５質量部、または２～３５質量部でもよい。重合性（共重合体（Ａ）の共重合成分の重合しやすさ）の観点からは、成分（ｄ）の含有量が少なすぎないことが好ましい。また、接着力の経時的低下抑制の観点からは、成分（ｄ）の含有量が多すぎないことが好ましい。 The content of component (d) in the copolymer component of copolymer (A) is not particularly limited, but is, for example, 0.5 to 40 parts by mass, 1 to 40 parts by mass, 1 to 35 parts by mass, or 2 It may be up to 35 parts by mass. From the viewpoint of polymerizability (ease of polymerization of copolymer components of copolymer (A)), it is preferable that the content of component (d) is not too small. Moreover, from the viewpoint of suppressing the deterioration of the adhesive strength over time, it is preferable that the content of the component (d) is not too large.
共重合体（Ａ）の重量平均分子量は、前述のとおり、１０万～４０万であり、例えば、１５万以上、または２０万以上であってもよく、例えば、３８万以下、または３５万以下であってもよい。共重合体（Ａ）の重量平均分子量が１０万未満では、粘着剤が硬化（皮膜化）しにくく、初期接着力が低くなる。共重合体（Ａ）の重量平均分子量が４０万を超えると、接着力の経時的低下が起こりやすい。 The weight average molecular weight of the copolymer (A) is, as described above, 100,000 to 400,000, and may be, for example, 150,000 or more, or 200,000 or more, and, for example, 380,000 or less, or 350,000 or less. may be When the weight average molecular weight of the copolymer (A) is less than 100,000, the adhesive is difficult to cure (film formation), resulting in low initial adhesive strength. If the weight-average molecular weight of the copolymer (A) exceeds 400,000, the adhesive strength tends to decrease over time.
共重合体（Ａ）の製造方法は、特に限定されず、例えば、共重合体（Ａ）の共重合成分全てを重合させて製造できる。前記重合方法も特に限定されず、例えば、公知の重合方法と同様またはそれに準じてもよい。前記重合方法としては、例えば、溶液重合法、塊状重合法、懸濁重合法等があげられる。重合に際して用いられる重合開始剤等は、特に限定されず、公知のものの中から適宜選択して使用することができる。より具体的には、前記重合開始剤としては、例えば、２，２’－アゾビスイソブチロニトリル、２，２’－アゾビス（４－メトキシ－２，４－ジメチルバレロニトリル）、２，２’－アゾビス（２，４－ジメチルバレロニトリル）、２，２’－アゾビス（２－メチルブチロニトリル）、１，１’－アゾビス（シクロヘキサン－１－カルボニトリル）、２，２’－アゾビス（２，４，４－トリメチルペンタン）、ジメチル－２，２’－アゾビス（２－メチルプロピオネート）等のアゾ系重合開始剤；ベンゾイルパーオキサイド、ｔ－ブチルハイドロパーオキサイド、ジ－ｔ－ブチルパーオキサイド、ｔ－ブチルパーオキシベンゾエート、ジクミルパーオキサイド、１，１－ビス（ｔ－ブチルパーオキシ）－３，３，５－トリメチルシクロヘキサン、１，１－ビス（ｔ－ブチルパーオキシ）シクロドデカン等の過酸化物系重合開始剤などがあげられる。なお、溶液重合の場合は、油溶性の重合開始剤を用いることが好ましい。重合開始剤は、１種類のみ用いても２種類以上併用してもよい。重合開始剤の使用量は、特に限定されず、例えば、一般的な使用量またはそれに準じてもよい。 The method for producing the copolymer (A) is not particularly limited, and for example, it can be produced by polymerizing all the copolymer components of the copolymer (A). The polymerization method is also not particularly limited, and may be, for example, similar to or according to a known polymerization method. Examples of the polymerization method include a solution polymerization method, a bulk polymerization method, a suspension polymerization method, and the like. The polymerization initiator and the like used in the polymerization are not particularly limited, and can be appropriately selected from known ones and used. More specifically, examples of the polymerization initiator include 2,2′-azobisisobutyronitrile, 2,2′-azobis(4-methoxy-2,4-dimethylvaleronitrile), 2,2 '-azobis (2,4-dimethylvaleronitrile), 2,2'-azobis (2-methylbutyronitrile), 1,1'-azobis (cyclohexane-1-carbonitrile), 2,2'-azobis ( 2,4,4-trimethylpentane), dimethyl-2,2'-azobis (2-methylpropionate) and other azo polymerization initiators; benzoyl peroxide, t-butyl hydroperoxide, di-t-butyl Peroxide, t-butyl peroxybenzoate, dicumyl peroxide, 1,1-bis(t-butylperoxy)-3,3,5-trimethylcyclohexane, 1,1-bis(t-butylperoxy)cyclo Examples include peroxide-based polymerization initiators such as dodecane. In addition, in the case of solution polymerization, it is preferable to use an oil-soluble polymerization initiator. One type of polymerization initiator may be used alone, or two or more types may be used in combination. The amount of the polymerization initiator to be used is not particularly limited, and may be, for example, a general amount or a similar amount.
前記共重合体（Ａ）の製造を溶液重合法で行う場合、用いる溶剤には各種の一般的な溶剤を用いることができる。このような溶剤としては、酢酸エチル、酢酸ｎ－ブチル等のエステル類；トルエン、ベンゼン等の芳香族炭化水素類；ｎ－ヘキサン、ｎ－ヘプタン等の脂肪族炭化水素類；シクロヘキサン、メチルシクロヘキサン等の脂環式炭化水素類；メチルエチルケトン、メチルイソブチルケトン等のケトン類などの有機溶剤があげられ、１種類のみ用いても２種類以上併用してもよい。前記溶液重合法において、共重合成分の濃度、反応時間、反応温度等も特に限定されず、例えば、一般的な溶液重合法を参考にして適宜設定できる。また、前記共重合成分の濃度、反応時間、反応温度等を適宜調整することで、共重合体（Ａ）の重量平均分子量を調節できる。例えば、前記共重合成分の濃度を低く、または反応時間を短く、または反応温度を高くすると、共重合体（Ａ）の重量平均分子量が小さくなりやすい。また、例えば、前記共重合成分の濃度を高く、または反応時間を長く、または反応温度を低くすると、共重合体（Ａ）の重量平均分子量が大きくなりやすい。 When the copolymer (A) is produced by a solution polymerization method, various common solvents can be used as the solvent. Examples of such solvents include esters such as ethyl acetate and n-butyl acetate; aromatic hydrocarbons such as toluene and benzene; aliphatic hydrocarbons such as n-hexane and n-heptane; cyclohexane, methylcyclohexane and the like. and organic solvents such as ketones such as methyl ethyl ketone and methyl isobutyl ketone, and may be used alone or in combination of two or more. In the solution polymerization method, the concentration of the copolymerization component, the reaction time, the reaction temperature, and the like are not particularly limited, and can be appropriately set, for example, with reference to general solution polymerization methods. Moreover, the weight average molecular weight of the copolymer (A) can be adjusted by appropriately adjusting the concentration of the copolymer component, the reaction time, the reaction temperature, and the like. For example, when the concentration of the copolymer component is low, the reaction time is short, or the reaction temperature is high, the weight average molecular weight of the copolymer (A) tends to decrease. Further, for example, when the concentration of the copolymer component is increased, the reaction time is increased, or the reaction temperature is decreased, the weight average molecular weight of the copolymer (A) tends to increase.
［１－２．共重合体（Ａ）以外の任意成分］
本発明のフィルム用粘着剤は、共重合体（Ａ）以外の任意成分以外を含んでいてもよいし、含んでいなくてもよい。前記任意成分としては、例えば、前述の架橋剤（Ｂ）があげられる。架橋剤（Ｂ）は、特に限定されず、例えば、アクリル系粘着剤に用いられる一般的な架橋剤またはそれに準じてもよい。架橋剤（Ｂ）としては、例えば、イソシアネート系架橋剤、エポキシ系架橋剤等があげられる。前記イソシアネート系架橋剤は、例えば、分子中にイソシアネート基（イソシアナト基）を１つまたは２つ以上有する架橋剤である。前記エポキシ系架橋剤は、例えば、分子中にエポキシ基を１つまたは２つ以上有する架橋剤である。前記イソシアネート系架橋剤としては、特に限定されないが、例えば、ヘキサメチレンジイソシアネート、トリレンジイソシアネート、キシレンジイソシアネート、イソプロピルジイソシアネート、イソホロンジイソシアネート及び、これらのイソシアヌレート体、ビウレット体、アダクト体等があげられる。また、前記エポキシ系架橋剤としては、特に限定されないが、例えば、ビスフェノールＡ型エポキシ化合物、ビスフェノールＦ型エポキシ化合物、Ｎ，Ｎ－ジグリシジルアニリン、Ｎ，Ｎ－ジグリシジルトルイジン、ｍ－Ｎ，Ｎ－ジグリシジルアミノフェニルグリシジルエーテル、ｐ－Ｎ，Ｎ－ジグリシジルアミノフェニルグリシジルエーテル、トリグリシジルイソシアヌレート、Ｎ，Ｎ，Ｎ’，Ｎ’－テトラグリシジルジアミノジフェニルメタン、Ｎ，Ｎ，Ｎ’，Ｎ’－テトラグリシジル－ｍ－キシリレンジアミン、Ｎ，Ｎ，Ｎ’，Ｎ’，Ｎ’’－ペンタグリシジルジエチレントリアミン、１，３－ビス（Ｎ，Ｎ－ジグリシジルアミノエチル）シクロヘキサン等があげられる。また、架橋剤（Ｂ）は、１種類のみ用いても２種類以上併用してもよい。
[1-2. Optional components other than copolymer (A)]
The pressure-sensitive adhesive for films of the present invention may or may not contain any component other than the copolymer (A). Examples of the optional component include the above-described cross-linking agent (B). The cross-linking agent (B) is not particularly limited. Examples of the cross-linking agent (B) include isocyanate-based cross-linking agents and epoxy-based cross-linking agents. The isocyanate-based cross-linking agent is, for example, a cross-linking agent having one or more isocyanate groups (isocyanato groups) in the molecule. The epoxy-based cross-linking agent is, for example, a cross-linking agent having one or more epoxy groups in the molecule. Examples of the isocyanate-based cross-linking agent include, but are not limited to, hexamethylene diisocyanate, tolylene diisocyanate, xylene diisocyanate, isopropyl diisocyanate, isophorone diisocyanate, and isocyanurate, biuret and adducts thereof. The epoxy-based cross-linking agent is not particularly limited. -diglycidylaminophenyl glycidyl ether, p-N,N-diglycidylaminophenyl glycidyl ether, triglycidyl isocyanurate, N,N,N',N'-tetraglycidyldiaminodiphenylmethane, N,N,N',N' -tetraglycidyl-m-xylylenediamine, N,N,N',N',N''-pentaglycidyldiethylenetriamine, 1,3-bis(N,N-diglycidylaminoethyl)cyclohexane and the like. The cross-linking agent (B) may be used alone or in combination of two or more.
本発明のフィルム用粘着剤において、架橋剤（Ｂ）の含有率は、特に限定されないが、共重合体（Ａ）の質量に対し、例えば、１．５質量％以下または１．０質量％以下であってもよい。架橋剤（Ｂ）の含有率がこの範囲内であることにより、例えば、接着力の経時的低下をさらに抑制できる。 In the pressure-sensitive adhesive for film of the present invention, the content of the cross-linking agent (B) is not particularly limited, but is, for example, 1.5% by mass or less or 1.0% by mass or less with respect to the mass of the copolymer (A). may be When the content of the cross-linking agent (B) is within this range, for example, it is possible to further suppress the decrease in adhesive force over time.
前記任意成分としては、架橋剤（Ｂ）以外には、例えば、溶剤等があげられる。前記溶剤は、特に限定されず、例えば、前記溶液重合法の溶剤と同様でもよい。例えば、前記溶液重合法で共重合体（Ａ）を製造した後に、用いた溶剤を除去せず、そのまま共重合体（Ａ）とともに本発明のフィルム用粘着剤に用いてもよい。具体的には、例えば、前記溶液重合法で得られた共重合体（Ａ）の溶液をそのまま本発明のフィルム用粘着剤としてもよいし、架橋剤（Ｂ）を加えて本発明のフィルム用粘着剤としてもよい。 Examples of the optional components other than the cross-linking agent (B) include solvents. The solvent is not particularly limited, and may be, for example, the same solvent as used in the solution polymerization method. For example, after the copolymer (A) is produced by the solution polymerization method, the copolymer (A) may be used as it is for the film pressure-sensitive adhesive of the present invention without removing the solvent used. Specifically, for example, the solution of the copolymer (A) obtained by the solution polymerization method may be directly used as the pressure-sensitive adhesive for the film of the present invention, or the cross-linking agent (B) may be added to the adhesive for the film of the present invention. It may be used as an adhesive.
前記任意成分としては、その他に、例えば、粘着付与剤があげられる。前記粘着付与剤は特に限定されず、例えば、一般的な粘着付与剤等であってもよい。前記粘着付与剤は、例えば、粘着付与性を有する樹脂（粘着付与樹脂）等でもよい。前記粘着付与剤としては、例えば、ロジン系樹脂、テルペン系樹脂、石油系樹脂等があげられる。前記ロジン系樹脂としては、例えば、ガムロジン、トール油ロジン、ウッドロジンの未変性ロジンをアルコールなどでエステル化したロジンエステル、および、未変性ロジンを変性した不均化ロジン、重合ロジン、水添ロジンなどの変性ロジン、これら変性ロジンをさらにアルコール、グリセリン、ペンタエリスリトールなどでエステル化した不均化ロジンエステル、重合ロジンエステル、水添ロジンエステルなどの変性ロジンエステル、未変性ロジンにフェノールを付加したロジンフェノール等があげられる。前記テルペン系樹脂としては、例えば、未変性テルペンを変性した芳香族変性テルペン、水添化テルペン、テルペンとフェノールを共重合したテルペンフェノール等があげられる。前記石油系樹脂としては、例えば、炭化水素樹脂があげられ、前記炭化水素樹脂としては、例えば、脂肪族系炭化水素樹脂、芳香族系炭化水素樹脂等があげられる。これらの粘着付与剤は、１種類のみ用いても２種類以上併用してもよい。 Other examples of the optional component include a tackifier. The tackifier is not particularly limited, and may be, for example, a general tackifier. The tackifier may be, for example, a resin having tackifying properties (tackifying resin). Examples of the tackifier include rosin-based resins, terpene-based resins, and petroleum-based resins. Examples of the rosin-based resin include gum rosin, tall oil rosin, rosin ester obtained by esterifying unmodified rosin of wood rosin with alcohol, disproportionated rosin obtained by modifying unmodified rosin, polymerized rosin, hydrogenated rosin, and the like. modified rosin, disproportionated rosin esters obtained by further esterifying these modified rosins with alcohol, glycerin, pentaerythritol, etc., modified rosin esters such as polymerized rosin esters and hydrogenated rosin esters, rosin phenol obtained by adding phenol to unmodified rosin etc. Examples of the terpene-based resin include aromatic modified terpene obtained by modifying unmodified terpene, hydrogenated terpene, and terpene phenol obtained by copolymerizing terpene and phenol. Examples of the petroleum-based resins include hydrocarbon resins, and examples of the hydrocarbon resins include aliphatic hydrocarbon resins and aromatic hydrocarbon resins. These tackifiers may be used alone or in combination of two or more.
また、前記任意成分としては、その他に、例えば、酸化防止剤、紫外線吸収剤等もあげられる。 In addition, the optional component may also include, for example, an antioxidant, an ultraviolet absorber, and the like.
［２．フィルム用粘着剤の使用方法および粘着シート］
本発明のフィルム用粘着剤は、例えば、フィルムと、他の被接着物との接着に用いることができる。前記フィルムは、特に限定されず、どのようなフィルムでもよい。前記フィルムとしては、例えば、ハロゲン含有ポリマー製フィルム等があげられる。前記ハロゲン含有ポリマーとしては、例えば、ポリ塩化ビニル（塩化ビニル樹脂）等があげられる。前記他の被接着物は、特に限定されず、例えば、他のフィルムでもよいし、プラスチック、ガラス、金属等であってもよい。
[2. Method of using adhesive for film and adhesive sheet]
The pressure-sensitive adhesive for films of the present invention can be used, for example, for bonding films to other adherends. The film is not particularly limited and may be any film. Examples of the film include halogen-containing polymer films. Examples of the halogen-containing polymer include polyvinyl chloride (vinyl chloride resin). The other adherend is not particularly limited, and may be, for example, another film, plastic, glass, metal, or the like.
本発明のフィルム用粘着剤は、以下の理由により、ハロゲン含有ポリマー製フィルムに特に好適に用いることができる。 The pressure-sensitive adhesive for films of the present invention can be particularly suitably used for halogen-containing polymer films for the following reasons.
ハロゲン含有ポリマー製フィルムとしては、例えば、マーキングフィルムやオーバーラミネートフィルム等に用いられるポリ塩化ビニル（塩化ビニル樹脂）を含むフィルムがある。このようなフィルムは、一般に、可塑剤により軟質化されている。前記フィルムに粘着剤を付与した場合、前記可塑剤が前記フィルムから前記粘着剤へと移行し、前記粘着剤の粘着力の低下、凝集力の低下等を引き起こすおそれがある。これにより、前記フィルムが接着されている他の被接着物から、前記フィルムが剥がれるおそれがある。特に、高温環境下では、フィルムから粘着剤に対する可塑剤の移行が起こりやすい。しかし、本発明のフィルム用粘着剤によれば、前記フィルムからの可塑剤の移行を抑制できる。したがって、本発明のフィルム用粘着剤は、可塑剤を含むフィルムに用いた場合においても、高温環境下でも接着力の経時的低下が起こりにくい。 Examples of halogen-containing polymer films include films containing polyvinyl chloride (vinyl chloride resin) used for marking films, overlaminate films, and the like. Such films are generally softened with a plasticizer. When a pressure-sensitive adhesive is applied to the film, the plasticizer may migrate from the film to the pressure-sensitive adhesive, causing a decrease in the adhesive strength of the pressure-sensitive adhesive, a decrease in cohesive strength, and the like. As a result, the film may be peeled off from other adherends to which the film is adhered. In particular, in a high-temperature environment, migration of the plasticizer from the film to the adhesive tends to occur. However, according to the pressure-sensitive adhesive for film of the present invention, migration of the plasticizer from the film can be suppressed. Therefore, even when the pressure-sensitive adhesive for film of the present invention is used for a film containing a plasticizer, the adhesive force is less likely to deteriorate over time even in a high-temperature environment.
本発明のフィルム用粘着剤により接着される前記フィルムは、可塑剤を含んでいなくてもよいが、前述の理由により、可塑剤を含んでいてもよい。可塑剤を含むフィルムとしては、特に限定されないが、前述のとおり、例えば、ハロゲン含有ポリマー製フィルムであり、例えば、ポリ塩化ビニルフィルム（ポリ塩化ビニルを含むフィルム）である。前記可塑剤としては、特に限定されないが、例えば、フタル酸系、リン酸系、アジピン酸系、トリメリット酸系、エポキシ系等の可塑剤があげられる。フタル酸系可塑剤としては、例えば、フタル酸ジ－２－エチルヘキシル、フタル酸ジイソノニル、フタル酸ジブチル、フタル酸ブチルベンジル、フタル酸ジイソデシル、フタル酸ジノルマルオクチル等があげられる。アジピン酸系可塑剤としては、例えば、アジピン酸ジ－２－エチルヘキシル、アジピン酸ジイソノニル等があげられる。リン酸系可塑剤としては、例えば、リン酸トリクレジルがある。トリメリット酸系としてはトリメリット酸トリー２－エチルヘキシル等があげられる。エポキシ系可塑剤としては、例えば、脂肪酸をエポキシド化したエポキシ化脂肪酸オクチル、エポキシ化脂肪酸ブチル、油脂をエポキシド化したエポキシ化大豆油、エポキシ化亜麻仁油等があげられる。 The film adhered by the pressure-sensitive adhesive for film of the present invention may not contain a plasticizer, but may contain a plasticizer for the reason described above. The film containing a plasticizer is not particularly limited, but as described above, it is, for example, a halogen-containing polymer film such as a polyvinyl chloride film (a film containing polyvinyl chloride). Examples of the plasticizer include, but are not limited to, phthalic acid-based, phosphoric acid-based, adipic acid-based, trimellitic acid-based, and epoxy-based plasticizers. Examples of phthalic plasticizers include di-2-ethylhexyl phthalate, diisononyl phthalate, dibutyl phthalate, butyl benzyl phthalate, diisodecyl phthalate, and di-n-octyl phthalate. Examples of the adipic acid plasticizer include di-2-ethylhexyl adipate and diisononyl adipate. Phosphate-based plasticizers include, for example, tricresyl phosphate. Examples of trimellitic acids include tri-2-ethylhexyl trimellitate. Examples of epoxy plasticizers include epoxidized fatty acid octyl obtained by epoxidizing a fatty acid, epoxidized fatty acid butyl, epoxidized soybean oil obtained by epoxidizing fats and oils, and epoxidized linseed oil.
本発明のフィルム用粘着剤は、例えば、前述のとおり、本発明の粘着シートに用いることができる。本発明の粘着シートは、前述のとおり、フィルム製基材と、粘着剤層とを含み、前記粘着剤層が、本発明のフィルム用粘着剤を含むことを特徴とする。これ以外は、本発明の粘着シートの構成は特に限定されず、任意である。前記フィルム製基材は、特に限定されないが、例えば、前述のフィルムであり、例えば、ハロゲン含有ポリマー製フィルムであり、例えば、ポリ塩化ビニルフィルム（ポリ塩化ビニルを含むフィルム）である。なお、本発明において、「粘着シート」は、前述のとおり、粘着テープも含む。また、前述のとおり、本発明において、「シート」はフィルムも含み、厚みは特に限定されない。 The pressure-sensitive adhesive for films of the present invention can be used, for example, in the pressure-sensitive adhesive sheet of the present invention, as described above. As described above, the pressure-sensitive adhesive sheet of the present invention includes a film substrate and a pressure-sensitive adhesive layer, and the pressure-sensitive adhesive layer includes the film pressure-sensitive adhesive of the present invention. Other than this, the configuration of the pressure-sensitive adhesive sheet of the present invention is not particularly limited and is arbitrary. The film substrate is not particularly limited, but is, for example, the film described above, such as a halogen-containing polymer film, such as a polyvinyl chloride film (a film containing polyvinyl chloride). In addition, in the present invention, the "adhesive sheet" includes an adhesive tape as described above. Moreover, as described above, in the present invention, the "sheet" includes a film, and the thickness is not particularly limited.
本発明の粘着シートの製造方法も特に限定されず、本発明のフィルム用粘着剤を用いる以外は一般的な粘着シートの製造方法と同様またはそれに準じてもよいが、例えば、以下のようにして行なうことができる。まず、本発明の粘着剤を、ポリエチレンテレフタレート（ＰＥＴ）フィルム等の剥離ライナーに塗布する。なお、このとき、本発明の粘着剤に、他の成分を混合してもよい。例えば、本発明の粘着剤が架橋剤（Ｂ）を含まない場合は、架橋剤（Ｂ）を混合して塗布してもよい。その後、必要に応じ、前記粘着剤に含まれている有機溶剤等を、加熱等により除去する（乾燥させる）。さらに、前記粘着剤の上に、前記フィルム基材を被せた後に、一定温度下で放置するエージング処理を行ない、前記フィルム基材上に粘着剤層を形成する。このようにして、本発明の粘着シートを製造することができる。前記エージング処理の温度は特に限定されないが、例えば、５～８０℃であり、時間は、例えば１～１４日である。 The method for producing the pressure-sensitive adhesive sheet of the present invention is also not particularly limited, and may be the same as or in accordance with a general method for producing a pressure-sensitive adhesive sheet except that the film pressure-sensitive adhesive of the present invention is used. can do. First, the adhesive of the present invention is applied to a release liner such as polyethylene terephthalate (PET) film. At this time, other components may be mixed with the pressure-sensitive adhesive of the present invention. For example, when the adhesive of the present invention does not contain the cross-linking agent (B), the cross-linking agent (B) may be mixed and applied. After that, if necessary, the organic solvent or the like contained in the adhesive is removed by heating or the like (dried). Furthermore, after covering the adhesive with the film substrate, an aging treatment is performed by leaving it at a constant temperature to form an adhesive layer on the film substrate. Thus, the pressure-sensitive adhesive sheet of the present invention can be produced. Although the temperature of the aging treatment is not particularly limited, it is, for example, 5 to 80° C., and the time is, for example, 1 to 14 days.
本発明の粘着シートの使用方法も特に限定されず、例えば、一般的な粘着シートと同様でもよい。本発明の粘着シートは、前述のとおり、高温環境下でも接着力の経時的低下が起こりにくいため、高温環境下での使用にも適している。ただし、本発明の粘着シートの用途はこれに限定されず、どのような用途でも良い。 The method of using the pressure-sensitive adhesive sheet of the present invention is also not particularly limited, and may be, for example, the same as a general pressure-sensitive adhesive sheet. As described above, the pressure-sensitive adhesive sheet of the present invention is suitable for use in high-temperature environments because its adhesive strength is less likely to decrease over time even in high-temperature environments. However, the application of the pressure-sensitive adhesive sheet of the present invention is not limited to this, and any application may be used.
以下、本発明の実施例について説明する。なお、本発明はこれらの実施例に限定されるものではない。 Examples of the present invention will be described below. However, the present invention is not limited to these examples.
［実施例１］
以下のようにして、本実施例のフィルム用粘着剤および粘着シートを製造した。
[Example 1]
The pressure-sensitive adhesive for film and the pressure-sensitive adhesive sheet of this example were produced as follows.
（粘着剤の製造）
攪拌機、還流冷却器、温度計及び窒素導入管を備えた反応装置に、酢酸エチル４９重量部を仕込み、系内（前記反応装置の、反応を行なう容器内）を窒素ガス置換し、酢酸エチルの沸点まで昇温した。つぎに、アクリル酸２－エチルヘキシル（成分（ａ））７７質量部、メタクリル酸メチル（成分（ｂ））２０質量部、アクリル酸（成分（ｃ））０．８室量部、メタクリル酸２－ヒドロキシエチル（成分（ｃ））０．１部、酢酸ビニル（成分（ｄ））２量部、および２，２′－アゾビスイソブチロニトリル（重合開始剤、その他成分）０．２１質量部を混合し、モノマー混合物を調製した。そのモノマー混合物を、温度７７～８８℃の還流下で２時間かけて前記系内に滴下し、そのまま前記温度で加熱および攪拌を継続して重合反応を行った。前記モノマー混合物を前記系内に全量添加してから１．５時間後および３．０時間後に、それぞれ、酢酸エチル９質量部に２，２′－アゾビスイソブチロニトリル０．２５質量部を添加した混合溶液を、追加重合開始剤として系内に添加した。そして、前記モノマー混合物の全量添加から５時間後まで還流下で重合反応を継続した。重合反応終了後、酢酸エチルにて希釈し、固形分４５質量％のアクリレートポリマー（共重合体（Ａ））溶液を得た。
(Manufacture of adhesive)
A reaction apparatus equipped with a stirrer, a reflux condenser, a thermometer, and a nitrogen inlet tube was charged with 49 parts by weight of ethyl acetate, the inside of the system (the inside of the reaction vessel of the reaction apparatus) was replaced with nitrogen gas, and the ethyl acetate was The temperature was raised to the boiling point. Next, 2-ethylhexyl acrylate (component (a)) 77 parts by mass, methyl methacrylate (component (b)) 20 parts by mass, acrylic acid (component (c)) 0.8 parts by mass, methacrylic acid 2- Hydroxyethyl (component (c)) 0.1 parts, vinyl acetate (component (d)) 2 parts, and 2,2'-azobisisobutyronitrile (polymerization initiator, other components) 0.21 parts by mass were mixed to prepare a monomer mixture. The monomer mixture was added dropwise to the above system over 2 hours under reflux at a temperature of 77 to 88° C., and the polymerization reaction was carried out by continuing heating and stirring at the above temperature. 1.5 hours and 3.0 hours after the total amount of the monomer mixture was added to the system, 0.25 parts by mass of 2,2'-azobisisobutyronitrile was added to 9 parts by mass of ethyl acetate, respectively. The added mixed solution was added into the system as an additional polymerization initiator. Then, the polymerization reaction was continued under reflux until 5 hours after the addition of the total amount of the monomer mixture. After completion of the polymerization reaction, the mixture was diluted with ethyl acetate to obtain an acrylate polymer (copolymer (A)) solution with a solid content of 45% by mass.
前記のようにして製造したアクリレートポリマー（共重合体（Ａ））溶液１００質量部に対してエポキシ系架橋剤（架橋剤（Ｂ）、三菱ガス化学株式会社製、商品名「テトラッド－Ｃ」）０．０２７質量部を混合し、本実施例のフィルム用粘着剤を製造した。 An epoxy-based cross-linking agent (cross-linking agent (B), manufactured by Mitsubishi Gas Chemical Company, Inc., trade name “Tetrad-C”) is added to 100 parts by mass of the acrylate polymer (copolymer (A)) solution produced as described above. 0.027 parts by mass were mixed to produce a film pressure-sensitive adhesive of this example.
（粘着シートの製造）
本実施例のフィルム用粘着剤（前記共重合体（Ａ）溶液に前記架橋剤（Ｂ）を混合したもの）を、表面が離型処理されたフィルム（剥離ライナー、リンテック株式会社製、商品名「ＳＰ－８Ｅ」）の離型処理面上に、乾燥後の厚さが約２５μｍとなるように塗工し、１００℃で２分間乾燥させた。乾燥後、前記フィルム用粘着剤側に、ポリ塩化ビニルフィルム（フィルム製基材、タツノ化学株式会社製、商品名「Ｎクリア２８ＰＨＲ」、厚み：１００μｍ）をラミネートし、４０℃で２日エージングを行うことで、本実施例の粘着シートを得た。
(Manufacturing of adhesive sheet)
The pressure-sensitive adhesive for film of this example (a mixture of the copolymer (A) solution and the cross-linking agent (B)) was applied to a film (release liner, manufactured by Lintec Corporation, trade name) whose surface was release-treated. “SP-8E”) was coated on the release-treated surface of the sample so that the thickness after drying was about 25 μm, and dried at 100° C. for 2 minutes. After drying, a polyvinyl chloride film (film base material, manufactured by Tatsuno Kagaku Co., Ltd., product name “N Clear 28PHR”, thickness: 100 μm) is laminated on the film adhesive side, and aged at 40 ° C. for 2 days. By carrying out, the adhesive sheet of the present example was obtained.
［実施例２～７、比較例１～６］
各成分の種類および配合比率を下記表１または表２に記載のとおりに変更したこと以外は実施例１と同様にしてフィルム用粘着剤および粘着シートを製造した。
[Examples 2 to 7, Comparative Examples 1 to 6]
A film pressure-sensitive adhesive and a pressure-sensitive adhesive sheet were produced in the same manner as in Example 1, except that the types and blending ratios of each component were changed as shown in Table 1 or Table 2 below.
前記各実施例および比較例で製造したフィルム用粘着剤および粘着シートについて、初期接着力、加熱保存後接着力、接着力維持率および共重合体（Ａ）の重量平均分子量を、下記の方法で測定した。測定結果は、下記表１および表２にまとめて示す。 The initial adhesive strength, the adhesive strength after heat storage, the adhesive strength retention rate, and the weight-average molecular weight of the copolymer (A) of the film pressure-sensitive adhesives and pressure-sensitive adhesive sheets produced in each of the above Examples and Comparative Examples were measured by the following methods. It was measured. The measurement results are collectively shown in Tables 1 and 2 below.
（初期接着力）
前記各実施例および比較例で製造した粘着シートを２０ｍｍ×６０ｍｍに切り出し、これを試験片とした。前記試験片から前記剥離ライナー（離型フィルム）を剥がし、ＳＵＳ板に２３℃、相対湿度５０％の雰囲気下にて２ｋｇゴムローラー２往復で加圧貼付した。これを同雰囲気下で６０分放置した後、剥離速度３００ｍｍ／ｍｉｎで１８０度剥離強度（Ｎ／２０ｍｍ）を測定した。この測定値を初期接着力とした。
(initial adhesive strength)
A piece of 20 mm×60 mm was cut from the pressure-sensitive adhesive sheet produced in each of the examples and comparative examples, and this was used as a test piece. The release liner (releasing film) was peeled off from the test piece, and pressure-bonded to a SUS plate in an atmosphere of 23° C. and 50% relative humidity by two reciprocations of a 2 kg rubber roller. After leaving this in the same atmosphere for 60 minutes, the 180 degree peel strength (N/20 mm) was measured at a peel speed of 300 mm/min. This measured value was defined as the initial adhesive strength.
（加熱保存後接着力）
前記各実施例および比較例で製造した粘着シートを２０ｍｍ×６０ｍｍに切り出し、これを試験片とした。その試験片を８０℃下で７日間保存した。その後、２３℃、相対湿度５０％の雰囲気下にて６０分放置し、前記剥離ライナーを剥がした後、ＳＵＳ板に同雰囲気下にて２ｋｇゴムローラー２往復で加圧貼付した。そして、同雰囲気下で６０分放置した後、剥離速度３００ｍｍ／ｍｉｎで１８０度剥離強度（Ｎ／２０ｍｍ）を測定した。この測定値を加熱保存後接着力（８０℃×７日保存後接着力）とした。
(Adhesive strength after heating and storage)
A piece of 20 mm×60 mm was cut from the pressure-sensitive adhesive sheet produced in each of the examples and comparative examples, and this was used as a test piece. The specimen was stored at 80°C for 7 days. Then, it was left for 60 minutes in an atmosphere of 23° C. and a relative humidity of 50%. After being left in the same atmosphere for 60 minutes, the 180 degree peel strength (N/20 mm) was measured at a peel speed of 300 mm/min. This measured value was taken as the adhesive strength after heating and storage (adhesive strength after storage at 80° C. for 7 days).
（接着力維持率）
前記のとおり測定した初期接着力および加熱保存後接着力（８０℃×７日保存後接着力）に基づき、下記数式により接着力維持率を算出した。下記接着力維持率の数値が大きいほど、接着力の経時的低下が抑制されていることの指標となる。前記各実施例および比較例のうち、下記接着力維持率が５０％以上のものを合格（○）と判定し、５０％未満のものを不合格（×）と判定した。
接着力維持率＝［加熱保存後接着力／初期接着力］×１００（％）
(adhesion retention rate)
Based on the initial adhesive strength and the adhesive strength after heat storage (adhesive strength after storage at 80°C x 7 days) measured as described above, the adhesive strength retention rate was calculated by the following formula. The larger the value of the following adhesive strength retention rate, the more the deterioration of the adhesive strength over time is suppressed. Among the examples and comparative examples described above, those with an adhesive force retention rate of 50% or more were judged as acceptable (◯), and those with less than 50% were judged as unacceptable (×).
Adhesion retention ratio = [adhesion after heating/initial adhesion] x 100 (%)
（分子量測定方法）
アクリルポリマー溶液をテトラヒドロフランで固形分が０．３ｗｔ％になるように調整し、ゲルパーミエーションクロマトグラフィー（ＧＰＣ）を用いて以下の条件で分子量を測定した。
・ＧＰＣ ：ｅ２６９５ Ｓｅｐａｒａｔｉｏｎ Ｍｏｄｕｌｅ（Ｗａｔｅｒｓ社製）
・カラム ：ＨＳＰｇｅｌ ｃｏｌｕｍｎ（Ｗａｔｅｒｓ社製）
・移動相溶媒：テトラヒドロフラン
・流速 ：０．３ｍｌ／ｍｉｎ
・カラム温度：４０℃
(Molecular weight measurement method)
The acrylic polymer solution was adjusted with tetrahydrofuran so as to have a solid content of 0.3 wt %, and the molecular weight was measured using gel permeation chromatography (GPC) under the following conditions.
・GPC: e2695 Separation Module (manufactured by Waters)
・Column: HSPgel column (manufactured by Waters)
・ Mobile phase solvent: tetrahydrofuran ・ Flow rate: 0.3 ml / min
・Column temperature: 40°C
なお、下記表１および表２中の略号の意味は、下記のとおりである。
ＢＡ ブチルアクリレート
ＡＡ アクリル酸
２ＥＨＡ ２－エチルヘキシルアクリレート
ｎ－ＯＡ ｎ－オクチルアクリレート
ＭＭＡ メチルメタクリレート
ＨＥＭＡ ２－ヒドロキシエチルメタクリレート
ＶＡｃ 酢酸ビニル
ＭＡ アクリル酸メチル
Ｔ－Ｃ 三菱ガス化学株式会社製、商品名「テトラッド－Ｃ」
Ｌ－４５Ｅ 東ソー株式会社製、商品名「コロネートＬ－４５Ｅ」
ハリタックＳＥ－１０ ハリマ化成グループ株式会社製の粘着付与剤（粘着付与樹脂）の商品名
ハリタックＦＫ－１２５ ハリマ化成グループ株式会社製の粘着付与剤（粘着付与樹脂）の商品名
The abbreviations in Tables 1 and 2 below have the following meanings.
BA Butyl acrylate AA Acrylic acid 2EHA 2-ethylhexyl acrylate n-OA n-octyl acrylate MMA Methyl methacrylate HEMA 2-Hydroxyethyl methacrylate VAc Vinyl acetate MA Methyl acrylate TC Mitsubishi Gas Chemical Company, Inc., trade name “Tetrad-C” ”
L-45E manufactured by Tosoh Corporation, trade name “Coronate L-45E”
HARITAC SE-10 Trade name of tackifier (tackifying resin) manufactured by Harima Chemicals Group Co., Ltd. HARITAC FK-125 Trade name of tackifier (tackifying resin) manufactured by Harima Chemicals Group Co., Ltd.
前記表１に示すとおり、実施例１～７の粘着剤は、全て、成分（ａ）～（ｃ）を共重合させた共重合体（Ａ）を含む。なお、実施例１～７の粘着剤においては、共重合体（Ａ）は、成分（ａ）～（ｃ）に加え、さらに成分（ｄ）を共重合させている。また、実施例１～７の粘着剤は、さらに架橋剤（Ｂ）を含む。 As shown in Table 1 above, the adhesives of Examples 1 to 7 all contain copolymer (A) obtained by copolymerizing components (a) to (c). In addition, in the pressure-sensitive adhesives of Examples 1 to 7, the copolymer (A) further copolymerized the component (d) in addition to the components (a) to (c). In addition, the adhesives of Examples 1 to 7 further contain a cross-linking agent (B).
前記表１に示すとおり、実施例１～７の粘着剤は、いずれも、初期接着力が高く、かつ、接着力の経時的低下が抑制されていた。 As shown in Table 1 above, all of the pressure-sensitive adhesives of Examples 1 to 7 had high initial adhesive strength and suppressed deterioration of adhesive strength over time.
前記表２に示すとおり、比較例１の粘着剤は、成分（ａ）を用いず、これに代えて成分（ａ’）としてブチルアクリレート（炭素数４のアルキル基を有するアクリル酸アルキルエステル）を用いた。比較例２の粘着剤は、成分（ｂ）の質量が成分（ａ）の６分の１未満で、本発明における成分（ａ）および成分（ｂ）の質量比の条件を満たしていなかった。比較例３の粘着剤は、成分（ｂ）の質量が成分（ａ）の２分の１を超えており、これも、本発明における成分（ａ）および成分（ｂ）の質量比の条件を満たしていなかった。比較例４の粘着剤は、成分（ｂ）を用いず、これに代えて成分（ｂ’）としてアクリル酸メチルを用いた。比較例５の粘着剤は、共重合体（Ａ）の重量平均分子量が８万と低く、本発明の条件を満たしていなかった。比較例６の粘着剤は、共重合体（Ａ）の重量平均分子量が４０万を超えており、これも、本発明の条件を満たしていなかった。 As shown in Table 2 above, the pressure-sensitive adhesive of Comparative Example 1 did not use component (a), but instead contained butyl acrylate (acrylic acid alkyl ester having an alkyl group having 4 carbon atoms) as component (a′). Using. In the pressure-sensitive adhesive of Comparative Example 2, the mass of component (b) was less than 1/6 that of component (a), and did not satisfy the conditions for mass ratio of components (a) and (b) in the present invention. In the pressure-sensitive adhesive of Comparative Example 3, the mass of component (b) is more than half that of component (a), which also satisfies the conditions for the mass ratio of component (a) and component (b) in the present invention. was not fulfilled. The pressure-sensitive adhesive of Comparative Example 4 did not use component (b), and instead used methyl acrylate as component (b'). In the adhesive of Comparative Example 5, the copolymer (A) had a low weight-average molecular weight of 80,000 and did not satisfy the conditions of the present invention. In the adhesive of Comparative Example 6, the weight average molecular weight of the copolymer (A) exceeded 400,000, which also did not satisfy the conditions of the present invention.
比較例１、２、４および６は、いずれも、接着力の経時的低下が大きかった。比較例３は、接着力維持率が６４％で、接着力の経時的低下については合格と判定されたものの、初期接着力が実施例と比較してきわめて低かった。また、比較例５については、粘着剤が皮膜化できず（硬化せず）、接着力の測定自体ができなかった。 In Comparative Examples 1, 2, 4 and 6, the decrease in adhesive force over time was large. In Comparative Example 3, the adhesive force retention rate was 64%, and the adhesive force decreased over time was determined to be acceptable, but the initial adhesive force was extremely low compared to the examples. Further, in Comparative Example 5, the adhesive could not be formed into a film (not cured), and the adhesive strength itself could not be measured.
Claims (7)
前記共重合体（Ａ）の重量平均分子量が１０万～４０万であり、
前記共重合体（Ａ）の共重合成分中における前記成分（ｃ）の含有量が０．０５～４．０質量部であり、
前記架橋剤（Ｂ）の含有率が、前記共重合体（Ａ）の質量に対し、０．０２７質量％以上１．５質量％以下である
ことを特徴とするフィルム用粘着剤。
（ａ）炭素数８～１２のアルキル基を有するアクリル酸アルキルエステルおよび炭素数８～１２のアルキル基を有するメタクリル酸アルキルエステルの少なくとも一方
（ｂ）炭素数１～３のアルキル基を有するメタクリル酸アルキルエステル
（ｃ）架橋性官能基を有するモノマー At least 30 to 90 parts by mass of the following component (a), 15 to 30 parts by mass of the following component (b) and a copolymer (A) of the following component (c), and a cross-linking agent (B) ,
The weight average molecular weight of the copolymer (A) is 100,000 to 400,000 ,
The content of the component (c) in the copolymer component of the copolymer (A) is 0.05 to 4.0 parts by mass,
A pressure-sensitive adhesive for films , wherein the content of the cross-linking agent (B) is 0.027% by mass or more and 1.5% by mass or less with respect to the mass of the copolymer (A) .
(a) at least one of an alkyl acrylate having an alkyl group of 8 to 12 carbon atoms and an alkyl methacrylate having an alkyl group of 8 to 12 carbon atoms (b) methacrylic acid having an alkyl group of 1 to 3 carbon atoms Alkyl ester (c) monomer having a crosslinkable functional group
（ｄ）カルボン酸の不飽和エステル The pressure-sensitive adhesive for film according to any one of claims 1 to 4, wherein the copolymer component of the copolymer (A) further contains the following component (d).
(d) unsaturated esters of carboxylic acids
前記粘着剤層が、請求項１から５のいずれか一項に記載のフィルム用粘着剤を含むことを特徴とする粘着シート。 including a film substrate and an adhesive layer,
A pressure-sensitive adhesive sheet, wherein the pressure-sensitive adhesive layer contains the pressure-sensitive adhesive for film according to any one of claims 1 to 5 .
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| JP2004067958A (en) | 2002-08-09 | 2004-03-04 | Nippon Carbide Ind Co Inc | Adhesive composition for re-peelable surface-protecting sheet and re-preelable surface-protecting sheet |
| JP2005247903A (en) | 2004-03-01 | 2005-09-15 | Nippon Shokubai Co Ltd | Pressure-sensitive adhesive compositions |
| WO2013088686A1 (en) | 2011-12-14 | 2013-06-20 | 三井化学株式会社 | Adhesive resin composition, laminate body, and self-peeling method |
| JP2017002190A (en) | 2015-06-10 | 2017-01-05 | リンテック株式会社 | Thermal peeling adhesive sheet |
| JP6296184B1 (en) | 2017-02-06 | 2018-03-20 | 東洋インキＳｃホールディングス株式会社 | Polyvinyl chloride adhesive and adhesive sheet |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2004067958A (en) | 2002-08-09 | 2004-03-04 | Nippon Carbide Ind Co Inc | Adhesive composition for re-peelable surface-protecting sheet and re-preelable surface-protecting sheet |
| JP2005247903A (en) | 2004-03-01 | 2005-09-15 | Nippon Shokubai Co Ltd | Pressure-sensitive adhesive compositions |
| WO2013088686A1 (en) | 2011-12-14 | 2013-06-20 | 三井化学株式会社 | Adhesive resin composition, laminate body, and self-peeling method |
| JP2017002190A (en) | 2015-06-10 | 2017-01-05 | リンテック株式会社 | Thermal peeling adhesive sheet |
| JP6296184B1 (en) | 2017-02-06 | 2018-03-20 | 東洋インキＳｃホールディングス株式会社 | Polyvinyl chloride adhesive and adhesive sheet |
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