CN116536005A - Adhesive composition, adhesive sheet, and joined body - Google Patents
Adhesive composition, adhesive sheet, and joined body Download PDFInfo
- Publication number
- CN116536005A CN116536005A CN202310680383.0A CN202310680383A CN116536005A CN 116536005 A CN116536005 A CN 116536005A CN 202310680383 A CN202310680383 A CN 202310680383A CN 116536005 A CN116536005 A CN 116536005A
- Authority
- CN
- China
- Prior art keywords
- mass
- adhesive layer
- polymer
- adhesive
- parts
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- 239000000853 adhesive Substances 0.000 title claims abstract description 242
- 230000001070 adhesive effect Effects 0.000 title claims abstract description 242
- 239000000203 mixture Substances 0.000 title claims abstract description 168
- 239000012790 adhesive layer Substances 0.000 claims abstract description 148
- 229920000642 polymer Polymers 0.000 claims abstract description 113
- 239000002608 ionic liquid Substances 0.000 claims abstract description 88
- 239000000178 monomer Substances 0.000 claims description 115
- 229910052782 aluminium Inorganic materials 0.000 claims description 56
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 56
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 55
- 229920000058 polyacrylate Polymers 0.000 claims description 50
- 229910052751 metal Inorganic materials 0.000 claims description 47
- 239000002184 metal Substances 0.000 claims description 47
- 125000004432 carbon atom Chemical group C* 0.000 claims description 35
- 239000007787 solid Substances 0.000 claims description 28
- 125000000217 alkyl group Chemical group 0.000 claims description 18
- 229920000831 ionic polymer Polymers 0.000 claims description 12
- 125000003545 alkoxy group Chemical group 0.000 claims description 11
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 6
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 4
- 239000004820 Pressure-sensitive adhesive Substances 0.000 description 106
- -1 1, 3-dimethylbutyl Chemical group 0.000 description 91
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 69
- 239000010410 layer Substances 0.000 description 69
- 239000000243 solution Substances 0.000 description 37
- 239000000758 substrate Substances 0.000 description 36
- 239000002585 base Substances 0.000 description 30
- 239000000463 material Substances 0.000 description 29
- 238000006116 polymerization reaction Methods 0.000 description 27
- 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 26
- 150000002430 hydrocarbons Chemical group 0.000 description 26
- 238000005259 measurement Methods 0.000 description 26
- 238000000034 method Methods 0.000 description 25
- 239000003431 cross linking reagent Substances 0.000 description 23
- 239000002904 solvent Substances 0.000 description 23
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 21
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 description 21
- 239000003505 polymerization initiator Substances 0.000 description 21
- 150000001768 cations Chemical class 0.000 description 19
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 18
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 17
- 238000002360 preparation method Methods 0.000 description 17
- 239000000654 additive Substances 0.000 description 16
- 229920005989 resin Polymers 0.000 description 15
- 239000011347 resin Substances 0.000 description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 13
- 230000000996 additive effect Effects 0.000 description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 12
- 239000001301 oxygen Substances 0.000 description 12
- 229910052760 oxygen Inorganic materials 0.000 description 12
- 239000000126 substance Substances 0.000 description 12
- OZAIFHULBGXAKX-VAWYXSNFSA-N AIBN Substances N#CC(C)(C)\N=N\C(C)(C)C#N OZAIFHULBGXAKX-VAWYXSNFSA-N 0.000 description 11
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 11
- 229910001873 dinitrogen Inorganic materials 0.000 description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 238000000151 deposition Methods 0.000 description 10
- 230000008021 deposition Effects 0.000 description 10
- 230000009477 glass transition Effects 0.000 description 10
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 10
- HFCUBKYHMMPGBY-UHFFFAOYSA-N 2-methoxyethyl prop-2-enoate Chemical compound COCCOC(=O)C=C HFCUBKYHMMPGBY-UHFFFAOYSA-N 0.000 description 9
- 150000001450 anions Chemical class 0.000 description 9
- 229920001519 homopolymer Polymers 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 7
- 229910052802 copper Inorganic materials 0.000 description 7
- 239000010949 copper Substances 0.000 description 7
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 7
- 125000005842 heteroatom Chemical group 0.000 description 7
- 150000002500 ions Chemical class 0.000 description 7
- 229910052757 nitrogen Inorganic materials 0.000 description 7
- 229920000728 polyester Polymers 0.000 description 7
- 230000009467 reduction Effects 0.000 description 7
- 229920002799 BoPET Polymers 0.000 description 6
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 6
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 description 6
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 6
- 150000001875 compounds Chemical class 0.000 description 6
- 238000001035 drying Methods 0.000 description 6
- 238000010528 free radical solution polymerization reaction Methods 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 238000002156 mixing Methods 0.000 description 6
- 239000003755 preservative agent Substances 0.000 description 6
- 230000002829 reductive effect Effects 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 6
- NDWUBGAGUCISDV-UHFFFAOYSA-N 4-hydroxybutyl prop-2-enoate Chemical compound OCCCCOC(=O)C=C NDWUBGAGUCISDV-UHFFFAOYSA-N 0.000 description 5
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 5
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 5
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 5
- 239000002253 acid Substances 0.000 description 5
- 239000002131 composite material Substances 0.000 description 5
- 239000011231 conductive filler Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000005227 gel permeation chromatography Methods 0.000 description 5
- 239000003112 inhibitor Substances 0.000 description 5
- 229910052749 magnesium Inorganic materials 0.000 description 5
- 239000011777 magnesium Substances 0.000 description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 5
- 239000000123 paper Substances 0.000 description 5
- 229920001223 polyethylene glycol Polymers 0.000 description 5
- 230000002335 preservative effect Effects 0.000 description 5
- CXMXRPHRNRROMY-UHFFFAOYSA-N sebacic acid Chemical compound OC(=O)CCCCCCCCC(O)=O CXMXRPHRNRROMY-UHFFFAOYSA-N 0.000 description 5
- 229910052709 silver Inorganic materials 0.000 description 5
- 239000004332 silver Substances 0.000 description 5
- 238000003860 storage Methods 0.000 description 5
- 229910052718 tin Inorganic materials 0.000 description 5
- 239000011135 tin Substances 0.000 description 5
- 239000004593 Epoxy Substances 0.000 description 4
- 239000002202 Polyethylene glycol Substances 0.000 description 4
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 4
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-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
- 125000003368 amide group Chemical group 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 4
- DOIRQSBPFJWKBE-UHFFFAOYSA-N dibutyl phthalate Chemical compound CCCCOC(=O)C1=CC=CC=C1C(=O)OCCCC DOIRQSBPFJWKBE-UHFFFAOYSA-N 0.000 description 4
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 4
- 229910052737 gold Inorganic materials 0.000 description 4
- 239000010931 gold Substances 0.000 description 4
- 239000006078 metal deactivator Substances 0.000 description 4
- BDJRBEYXGGNYIS-UHFFFAOYSA-N nonanedioic acid Chemical compound OC(=O)CCCCCCCC(O)=O BDJRBEYXGGNYIS-UHFFFAOYSA-N 0.000 description 4
- 150000002978 peroxides Chemical class 0.000 description 4
- 239000000049 pigment Substances 0.000 description 4
- 150000005846 sugar alcohols Polymers 0.000 description 4
- ZUHZGEOKBKGPSW-UHFFFAOYSA-N tetraglyme Chemical compound COCCOCCOCCOCCOC ZUHZGEOKBKGPSW-UHFFFAOYSA-N 0.000 description 4
- LMDZBCPBFSXMTL-UHFFFAOYSA-N 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide Chemical compound CCN=C=NCCCN(C)C LMDZBCPBFSXMTL-UHFFFAOYSA-N 0.000 description 3
- JAHNSTQSQJOJLO-UHFFFAOYSA-N 2-(3-fluorophenyl)-1h-imidazole Chemical compound FC1=CC=CC(C=2NC=CN=2)=C1 JAHNSTQSQJOJLO-UHFFFAOYSA-N 0.000 description 3
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-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
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 239000012298 atmosphere Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 239000004927 clay Substances 0.000 description 3
- 238000004132 cross linking Methods 0.000 description 3
- 229920001971 elastomer Polymers 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 239000001530 fumaric acid Substances 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 239000012948 isocyanate Substances 0.000 description 3
- 239000011133 lead Substances 0.000 description 3
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 3
- 239000011976 maleic acid Substances 0.000 description 3
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 239000004014 plasticizer Substances 0.000 description 3
- 229920001225 polyester resin Polymers 0.000 description 3
- 239000004645 polyester resin Substances 0.000 description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 description 3
- 239000005020 polyethylene terephthalate Substances 0.000 description 3
- 230000002441 reversible effect Effects 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 238000011282 treatment Methods 0.000 description 3
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 3
- 229920002554 vinyl polymer Polymers 0.000 description 3
- PUPZLCDOIYMWBV-UHFFFAOYSA-N (+/-)-1,3-Butanediol Chemical compound CC(O)CCO PUPZLCDOIYMWBV-UHFFFAOYSA-N 0.000 description 2
- MYRTYDVEIRVNKP-UHFFFAOYSA-N 1,2-Divinylbenzene Chemical compound C=CC1=CC=CC=C1C=C MYRTYDVEIRVNKP-UHFFFAOYSA-N 0.000 description 2
- RTTZISZSHSCFRH-UHFFFAOYSA-N 1,3-bis(isocyanatomethyl)benzene Chemical compound O=C=NCC1=CC=CC(CN=C=O)=C1 RTTZISZSHSCFRH-UHFFFAOYSA-N 0.000 description 2
- 229940043375 1,5-pentanediol Drugs 0.000 description 2
- 125000000954 2-hydroxyethyl group Chemical group [H]C([*])([H])C([H])([H])O[H] 0.000 description 2
- SXIFAEWFOJETOA-UHFFFAOYSA-N 4-hydroxy-butyl Chemical group [CH2]CCCO SXIFAEWFOJETOA-UHFFFAOYSA-N 0.000 description 2
- 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 2
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 2
- 239000004322 Butylated hydroxytoluene Substances 0.000 description 2
- NLZUEZXRPGMBCV-UHFFFAOYSA-N Butylhydroxytoluene Chemical compound CC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 NLZUEZXRPGMBCV-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- MQIUGAXCHLFZKX-UHFFFAOYSA-N Di-n-octyl phthalate Natural products CCCCCCCCOC(=O)C1=CC=CC=C1C(=O)OCCCCCCCC MQIUGAXCHLFZKX-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- RAXXELZNTBOGNW-UHFFFAOYSA-O Imidazolium Chemical compound C1=C[NH+]=CN1 RAXXELZNTBOGNW-UHFFFAOYSA-O 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 229910002651 NO3 Inorganic materials 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- 229920002565 Polyethylene Glycol 400 Polymers 0.000 description 2
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
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- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- ZJCCRDAZUWHFQH-UHFFFAOYSA-N Trimethylolpropane Chemical compound CCC(CO)(CO)CO ZJCCRDAZUWHFQH-UHFFFAOYSA-N 0.000 description 2
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- QYKIQEUNHZKYBP-UHFFFAOYSA-N Vinyl ether Chemical compound C=COC=C QYKIQEUNHZKYBP-UHFFFAOYSA-N 0.000 description 2
- 239000001361 adipic acid Substances 0.000 description 2
- 235000011037 adipic acid Nutrition 0.000 description 2
- 150000003973 alkyl amines Chemical class 0.000 description 2
- XXROGKLTLUQVRX-UHFFFAOYSA-N allyl alcohol Chemical compound OCC=C XXROGKLTLUQVRX-UHFFFAOYSA-N 0.000 description 2
- 125000003277 amino group Chemical group 0.000 description 2
- 230000003712 anti-aging effect Effects 0.000 description 2
- 239000003963 antioxidant agent Substances 0.000 description 2
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- 230000015572 biosynthetic process Effects 0.000 description 2
- 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 2
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 description 2
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- 125000005462 imide group Chemical group 0.000 description 2
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- 125000000956 methoxy group Chemical group [H]C([H])([H])O* 0.000 description 2
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- SLCVBVWXLSEKPL-UHFFFAOYSA-N neopentyl glycol Chemical compound OCC(C)(C)CO SLCVBVWXLSEKPL-UHFFFAOYSA-N 0.000 description 2
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- 235000021317 phosphate Nutrition 0.000 description 2
- 229910052698 phosphorus Inorganic materials 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
- 239000002985 plastic film Substances 0.000 description 2
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- YPFDHNVEDLHUCE-UHFFFAOYSA-N propane-1,3-diol Chemical compound OCCCO YPFDHNVEDLHUCE-UHFFFAOYSA-N 0.000 description 2
- JUJWROOIHBZHMG-UHFFFAOYSA-O pyridinium Chemical compound C1=CC=[NH+]C=C1 JUJWROOIHBZHMG-UHFFFAOYSA-O 0.000 description 2
- CYIDZMCFTVVTJO-UHFFFAOYSA-N pyromellitic acid Chemical compound OC(=O)C1=CC(C(O)=O)=C(C(O)=O)C=C1C(O)=O CYIDZMCFTVVTJO-UHFFFAOYSA-N 0.000 description 2
- 239000005060 rubber Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000009987 spinning Methods 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 2
- LDHQCZJRKDOVOX-UHFFFAOYSA-N trans-crotonic acid Natural products CC=CC(O)=O LDHQCZJRKDOVOX-UHFFFAOYSA-N 0.000 description 2
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- 125000004051 hexyl group Chemical group [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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- GYNNXHKOJHMOHS-UHFFFAOYSA-N methyl-cycloheptane Natural products CC1CCCCCC1 GYNNXHKOJHMOHS-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- AXTNYCDVWRSOCU-UHFFFAOYSA-N n'-tert-butyl-n-ethylmethanediimine Chemical compound CCN=C=NC(C)(C)C AXTNYCDVWRSOCU-UHFFFAOYSA-N 0.000 description 1
- JAYXSROKFZAHRQ-UHFFFAOYSA-N n,n-bis(oxiran-2-ylmethyl)aniline Chemical compound C1OC1CN(C=1C=CC=CC=1)CC1CO1 JAYXSROKFZAHRQ-UHFFFAOYSA-N 0.000 description 1
- JMCVCHBBHPFWBF-UHFFFAOYSA-N n,n-diethyl-2-methylprop-2-enamide Chemical compound CCN(CC)C(=O)C(C)=C JMCVCHBBHPFWBF-UHFFFAOYSA-N 0.000 description 1
- OMNKZBIFPJNNIO-UHFFFAOYSA-N n-(2-methyl-4-oxopentan-2-yl)prop-2-enamide Chemical compound CC(=O)CC(C)(C)NC(=O)C=C OMNKZBIFPJNNIO-UHFFFAOYSA-N 0.000 description 1
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- 125000004108 n-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 125000004433 nitrogen atom Chemical group N* 0.000 description 1
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- 229920000620 organic polymer Polymers 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 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
- 229940083254 peripheral vasodilators imidazoline derivative Drugs 0.000 description 1
- 150000004978 peroxycarbonates Chemical class 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 150000003014 phosphoric acid esters Chemical class 0.000 description 1
- 125000004437 phosphorous atom Chemical group 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000004633 polyglycolic acid Substances 0.000 description 1
- 229920001195 polyisoprene Polymers 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
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- 238000012545 processing Methods 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
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- 125000002914 sec-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
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- 239000007921 spray Substances 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 150000003440 styrenes Chemical class 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 125000000020 sulfo group Chemical group O=S(=O)([*])O[H] 0.000 description 1
- 150000003871 sulfonates Chemical class 0.000 description 1
- 125000004434 sulfur atom Chemical group 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 238000010557 suspension polymerization reaction Methods 0.000 description 1
- LRBQNJMCXXYXIU-NRMVVENXSA-N tannic acid Chemical class OC1=C(O)C(O)=CC(C(=O)OC=2C(=C(O)C=C(C=2)C(=O)OC[C@@H]2[C@H]([C@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)O2)OC(=O)C=2C=C(OC(=O)C=3C=C(O)C(O)=C(O)C=3)C(O)=C(O)C=2)O)=C1 LRBQNJMCXXYXIU-NRMVVENXSA-N 0.000 description 1
- 150000003505 terpenes Chemical class 0.000 description 1
- 235000007586 terpenes Nutrition 0.000 description 1
- CIHOLLKRGTVIJN-UHFFFAOYSA-N tert‐butyl hydroperoxide Chemical compound CC(C)(C)OO CIHOLLKRGTVIJN-UHFFFAOYSA-N 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- DZLFLBLQUQXARW-UHFFFAOYSA-N tetrabutylammonium Chemical compound CCCC[N+](CCCC)(CCCC)CCCC DZLFLBLQUQXARW-UHFFFAOYSA-N 0.000 description 1
- CBXCPBUEXACCNR-UHFFFAOYSA-N tetraethylammonium Chemical compound CC[N+](CC)(CC)CC CBXCPBUEXACCNR-UHFFFAOYSA-N 0.000 description 1
- UWHCKJMYHZGTIT-UHFFFAOYSA-N tetraethylene glycol Chemical compound OCCOCCOCCOCCO UWHCKJMYHZGTIT-UHFFFAOYSA-N 0.000 description 1
- UFDHBDMSHIXOKF-UHFFFAOYSA-N tetrahydrophthalic acid Natural products OC(=O)C1=C(C(O)=O)CCCC1 UFDHBDMSHIXOKF-UHFFFAOYSA-N 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-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
- 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 1
- 150000003852 triazoles Chemical group 0.000 description 1
- PUVAFTRIIUSGLK-UHFFFAOYSA-M trimethyl(oxiran-2-ylmethyl)azanium;chloride Chemical compound [Cl-].C[N+](C)(C)CC1CO1 PUVAFTRIIUSGLK-UHFFFAOYSA-M 0.000 description 1
- 229920001567 vinyl ester resin Polymers 0.000 description 1
- 235000012431 wafers Nutrition 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- 239000011667 zinc carbonate Substances 0.000 description 1
- 229910000010 zinc carbonate Inorganic materials 0.000 description 1
- 235000004416 zinc carbonate Nutrition 0.000 description 1
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 description 1
- 229910000165 zinc phosphate Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
- C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C09J133/062—Copolymers with monomers not covered by C09J133/06
- C09J133/064—Copolymers with monomers not covered by C09J133/06 containing anhydride, COOH or COOM groups, with M being metal or onium-cation
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
- C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C09J133/062—Copolymers with monomers not covered by C09J133/06
- C09J133/066—Copolymers with monomers not covered by C09J133/06 containing -OH groups
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
- C09J133/14—Homopolymers or copolymers of esters of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J201/00—Adhesives based on unspecified macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2433/00—Presence of (meth)acrylic polymer
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Adhesive Tapes (AREA)
- Organic Insulating Materials (AREA)
Abstract
The present application relates to an adhesive composition, an adhesive sheet, and a joined body. The present invention relates to an adhesive composition comprising at least a polymer and an ionic liquid, wherein an adhesive layer is formed from a composition comprising components other than the ionic liquid among the components contained therein, and the adhesive layer has a relative dielectric constant of 5 or more at a frequency of 100Hz after being left for 3 days in an environment of 22 ℃ and 20% RH.
Description
The present application is a divisional application of chinese patent application No.201980057389.4 (PCT application No. PCT/JP 2019/034143) filed on 30 th of 2019 and entitled "adhesive composition, adhesive sheet, and joined body".
Technical Field
The present invention relates to an adhesive composition, an adhesive sheet including an adhesive layer formed from the adhesive composition, and a bonded body of the adhesive sheet and an adherend.
Background
In an electronic component manufacturing process and the like, there is an increasing demand for reworking for improving yield, recycling in which components are decomposed and recovered after use, and the like. In order to meet such a demand, a double-sided pressure-sensitive adhesive sheet having a constant pressure-sensitive adhesive force and a constant peelability may be used when joining members in an electronic component manufacturing process or the like.
As the double-sided pressure-sensitive adhesive sheet capable of achieving the above-mentioned pressure-sensitive adhesive force and releasability, a pressure-sensitive adhesive sheet (electrically-releasable pressure-sensitive adhesive sheet) is known in which an ionic liquid containing cations and anions is used as a component for forming a pressure-sensitive adhesive composition, and a voltage is applied to a pressure-sensitive adhesive layer to release the pressure-sensitive adhesive layer (patent documents 1 to 3).
Regarding the electrically-peeling type pressure-sensitive adhesive sheets of patent documents 1 to 3, it is considered that the application of voltage causes the cations of the ionic liquid to move on the cathode side and reduce, the anions of the ionic liquid to move on the anode side and oxidize, and the adhesion force at the adhesion interface becomes weak and peeling becomes easy.
Prior art literature
Patent literature
Patent document 1: japanese patent application laid-open No. 2010-037354
Patent document 2: japanese patent No. 6097112
Patent document 3: japanese patent No. 4139851
Disclosure of Invention
Problems to be solved by the invention
In the case of the electrically-peeling adhesive sheet, it is preferable that the members are firmly bonded when no voltage is applied and can be peeled off with a small force when a voltage is applied. Therefore, in the electrically-peeling type pressure-sensitive adhesive sheet, it is preferable that the adhesive force decrease rate by voltage application is large. However, in an environment with low humidity such as winter, the rate of decrease in adhesion due to voltage application becomes a problem.
The present invention has been made in view of the above-described circumstances, and an object thereof is to provide an adhesive composition capable of sufficiently reducing an adhesive force by application of a voltage even in a low humidity environment, and an adhesive sheet comprising an adhesive layer formed from the adhesive composition.
Means for solving the problems
According to the studies of the inventors of the present application, the decrease in the rate of decrease in the adhesive force by the voltage application in the low humidity environment is caused by the decrease in the water content of the adhesive layer in the low humidity environment, and the cation and anion of the ionic liquid become less likely to move.
The inventors of the present application have further repeatedly studied and as a result obtained the following findings.
First, it was found that the relative permittivity of the components other than the ionic liquid of the adhesive layer has a correlation with the adhesive force decrease rate by voltage application, and by increasing the relative permittivity, the adhesive force decrease rate by voltage application can be increased. In addition, it was found that even when the water content of the adhesive layer is reduced in a low humidity environment, if the relative dielectric constant is large, the electrical peelability is good, that is, the adhesive force reduction rate by voltage application is large.
Second, it was found that the ionic conductivity of the adhesive layer and the capacitance per unit area of the interface between the adhesive layer and the adherend are correlated with the adhesive force decrease rate by voltage application, and that the adhesive force decrease rate by voltage application can be increased by increasing the ionic conductivity and the capacitance per unit area of the interface between the adhesive layer and the adherend. Further, it has been found that even when the water content of the pressure-sensitive adhesive layer is reduced in a low humidity environment, if the ionic conductivity and the capacitance per unit area of the interface between the pressure-sensitive adhesive layer and the adherend are large, the electrical releasability is good, that is, the adhesive strength reduction rate by voltage application is large.
One adhesive composition of the present invention, which has been completed based on the above-described 1 st observation, is an adhesive composition comprising a polymer and an ionic liquid, wherein an adhesive layer is formed from a composition comprising a component other than the ionic liquid among the components contained in the adhesive composition, and the adhesive layer has a relative dielectric constant of 5 or more at a frequency of 100Hz after being left for 3 days at 22 ℃ in an environment of 20% rh.
Another adhesive composition of the invention completed based on the above-mentioned view 2 is an adhesive composition comprising a polymer and an ionic liquid, wherein an adhesive layer is formed by using the adhesive composition and attached to an aluminum plate formed of a5052P H in JIS H4000:2014, and a capacitance per unit area of an interface of the adhesive layer and the aluminum plate after being left for 7 days in an environment of 22 ℃ and 15% rh is 0.9 μf/cm 2 The ionic conductivity of the adhesive layer is 10. Mu.S/m or more.
In one embodiment of the adhesive composition of the present invention, the capacitance per unit area of the interface of the adhesive layer and the aluminum plate after the adhesive composition is used to form an adhesive layer and is attached to the aluminum plate formed by A5052P H in JIS H4000:2014 and left for 7 days in an environment of 22 ℃ and 15% RH may be 1.2. Mu.F/cm 2 The ionic conductivity of the adhesive layer may be 20. Mu.S/m or more.
In one embodiment of the adhesive composition of the present invention, the adhesive composition may further comprise an ionic solid.
In one embodiment of the adhesive composition of the present invention, the polymer may comprise an ionic polymer.
In one embodiment of the adhesive composition of the present invention, the polymer may contain at least 1 selected from the group consisting of polyester-based polymers, urethane-based polymers, and acrylic-based polymers having carboxyl, alkoxy, hydroxyl, and/or amide bonds.
In addition, another adhesive composition of the present invention contains a polymer and an ionic liquid, and contains 0.5 to 30 parts by mass of the ionic liquid and 0.5 to 10 parts by mass of the ionic solid with respect to 100 parts by mass of the polymer.
The adhesive composition of the present invention contains a polymer and an ionic liquid, and contains 0.5 to 30 parts by mass of the ionic liquid per 100 parts by mass of the polymer, and 0.05 to 2 parts by mass of the ionic polymer in the polymer.
In addition, another adhesive composition of the present invention is an adhesive composition comprising 100 parts by mass of an acrylic polymer and 0.5 to 30 parts by mass of an ionic liquid, wherein the proportion of the polar group-containing monomer to the total monomer components constituting the acrylic polymer is 0.1 to 35% by mass.
In one embodiment of the present invention, the adhesive composition is used for electrical stripping.
The pressure-sensitive adhesive sheet of the present invention further comprises a pressure-sensitive adhesive layer formed from the pressure-sensitive adhesive composition of the present invention.
The joined body of the present invention further comprises: an adherend having a metal adherend surface, and an adhesive sheet of the invention, the adhesive layer of the adhesive sheet of the invention being bonded to the metal adherend surface.
The present application relates to the following:
1. an adhesive composition comprising a polymer and an ionic liquid, wherein an adhesive layer is formed from a composition formed from a component other than the ionic liquid among components contained in the adhesive composition, and the adhesive layer has a relative dielectric constant of 5 or more at a frequency of 100Hz after being left for 3 days in an environment of 22 ℃ and 20% RH.
2. An adhesive composition comprising a polymer and an ionic liquid, wherein an adhesive layer is formed by using the adhesive composition and is attached to an aluminum plate formed of A5052P H in JIS H4000:2014, and a capacitance per unit area of an interface of the adhesive layer and the aluminum plate after being left for 7 days in an environment of 22 ℃ and 15% RH is 0.9 mu F/cm 2 The ionic conductivity of the adhesive layer is 10. Mu.S/m or more.
3. The adhesive composition according to item 2, wherein an adhesive layer is formed by using the adhesive composition and attached to an aluminum plate formed of A5052PH32 in JIS H4000:2014, and a capacitance per unit area of an interface of the adhesive layer and the aluminum plate after being left for 7 days in an environment of 22 ℃ and 15% RH is 1.2. Mu.F/cm 2 The ionic conductivity of the adhesive layer is 20. Mu.S/m or more.
4. The adhesive composition according to any one of items 1 to 3, further comprising an ionic solid.
5. The adhesive composition according to any one of items 1 to 4, wherein the polymer comprises an ionic polymer.
6. The adhesive composition according to any one of claims 1 to 5, wherein the polymer comprises at least 1 selected from the group consisting of polyester-based polymers, urethane-based polymers, and acrylic-based polymers having carboxyl, alkoxy, hydroxyl, and/or amide bonds.
7. An adhesive composition comprising a polymer and an ionic liquid, wherein the adhesive composition comprises 0.5 to 30 parts by mass of the ionic liquid and 0.5 to 10 parts by mass of an ionic solid per 100 parts by mass of the polymer.
8. An adhesive composition comprising a polymer and an ionic liquid, wherein the ionic liquid is contained in an amount of 0.5 to 30 parts by mass per 100 parts by mass of the polymer, and the ionic polymer is contained in an amount of 0.05 to 2 parts by mass per 100 parts by mass of the polymer.
9. An adhesive composition comprising 100 parts by mass of an acrylic polymer and 0.5 to 30 parts by mass of an ionic liquid, wherein the proportion of a polar group-containing monomer relative to the total monomer components constituting the acrylic polymer is 0.1 to 35% by mass.
10. The adhesive composition according to any one of claims 1 to 9 for use in electrical peeling.
11. An adhesive sheet comprising an adhesive layer formed from the adhesive composition according to any one of claims 1 to 10.
12. A joined body is provided with:
an adherend having a metal adherend surface; and
the adhesive sheet according to item 11,
the adhesive layer of the adhesive sheet is bonded to the metal adherend surface.
ADVANTAGEOUS EFFECTS OF INVENTION
The adhesive composition of the present invention can sufficiently reduce the adhesive force by the application of voltage even in a low humidity environment.
Drawings
FIG. 1 is a cross-sectional view showing an example of an adhesive sheet according to the present invention.
FIG. 2 is a cross-sectional view showing an example of a laminated structure of an adhesive sheet according to the present invention.
FIG. 3 is a cross-sectional view showing another example of the laminated structure of the pressure-sensitive adhesive sheet of the present invention.
FIG. 4 is a cross-sectional view schematically showing a 180℃peel test method in examples.
FIG. 5 is a side view of a composite sample for measuring capacitance and ionic conductivity.
FIG. 6 is a top view of a composite sample for measuring capacitance and ionic conductivity.
FIG. 7 is an equivalent circuit diagram of a composite sample for measuring capacitance and ionic conductivity.
Detailed Description
Hereinafter, modes for carrying out the present invention will be described in detail. The present invention is not limited to the embodiments described below.
[ adhesive composition ]
The adhesive compositions of embodiments 1 and 2 of the present invention each comprise a polymer and an ionic liquid.
The adhesive layer is formed by using a composition comprising a component other than the ionic liquid among the components contained in the adhesive composition of embodiment 1, and the relative dielectric constant of the adhesive layer at a frequency of 100Hz is 5 or more after the adhesive layer is left for 3 days in an environment of 22 ℃ and 20% RH.
In addition, the adhesive composition of embodiment 2 is used to form a tackA mixture layer and attached to an aluminum plate formed of A5052P H in JIS H4000:2014, and a capacitance per unit area of an interface between the adhesive layer and the aluminum plate after being left for 7 days at 22 ℃ under 15% RH was 0.9. Mu.F/cm 2 The ionic conductivity of the adhesive layer is 10. Mu.S/m or more.
These adhesive compositions have a property of reducing the adhesive force by voltage application, and are suitable as adhesive compositions for electric separation.
The above embodiments 1 and 2 are not exclusive, and there are adhesive compositions according to both embodiments 1 and 2, and there are adhesive compositions according to either one alone. The effect of the present invention can be exerted by the adhesive composition according to any one of embodiment 1 and embodiment 2.
Hereinafter, these adhesive compositions will be described.
In the present specification, embodiments 1 and 2 of the present invention may be collectively referred to as "the present embodiment".
In the present specification, the adhesive force when no voltage is applied may be referred to as "initial adhesive force".
In addition, a composition formed of components other than the ionic liquid among the components contained in the binder composition is sometimes referred to as "binder composition containing no ionic liquid".
In addition, an adhesive layer formed by an adhesive composition containing no ionic liquid is sometimes referred to as an "adhesive layer containing no ionic liquid".
The property of reducing the adhesive force by voltage application may be referred to as "electrical peelability", and the case where the adhesive force reduction rate by voltage application is large may be referred to as "excellent electrical peelability".
< ingredients of adhesive composition >
(Polymer)
The adhesive composition of the present embodiment contains a polymer. In the present embodiment, the polymer is not particularly limited as long as it is a general organic polymer compound, and is, for example, a polymer of a monomer or a partial polymer. The monomer may be 1 monomer or a mixture of 2 or more monomers. The term "partial polymer" refers to a polymer in which at least a part of a monomer or a mixture of monomers is partially polymerized.
The polymer in the present embodiment is not particularly limited as long as it is a polymer that is generally used as a binder and has adhesion, and examples thereof include an acrylic polymer, a rubber polymer, a vinyl alkyl ether polymer, a silicone polymer, a polyester polymer, a polyamide polymer, a urethane polymer, a fluorine polymer, and an epoxy polymer. The polymer may be used alone or in combination of two or more.
In order to increase the relative permittivity of the components other than the ionic liquid of the obtained adhesive layer and to increase the ionic conductivity of the obtained adhesive layer and the capacitance per unit area of the adhesive interface to improve the electric peelability, it is preferable that the relative permittivity of the polymer is large, and particularly from this point of view, the polymer in the present embodiment preferably contains at least 1 selected from the group consisting of polyester-based polymers, urethane-based polymers, and acrylic-based polymers having carboxyl, alkoxy, hydroxyl, and/or amide bonds. Since the polyester polymer and the urethane polymer have hydroxyl groups which are easily polarized at the terminal, and the acrylic polymer having carboxyl groups, alkoxy groups, hydroxyl groups and/or amide bonds is easily polarized, a polymer having a relatively large relative dielectric constant can be obtained by using these polymers. The total content of the polyester polymer and the acrylic polymer having carboxyl, alkoxy, hydroxyl, and/or amide bonds in the polymer of the present embodiment is preferably 60 mass% or more, more preferably 80 mass% or more.
In addition, the polymer in the present embodiment is preferably an acrylic polymer, particularly in order to reduce cost, improve productivity, and increase initial adhesion.
That is, the adhesive composition of the present embodiment is preferably an acrylic adhesive composition containing an acrylic polymer as a polymer.
The acrylic polymer preferably contains a monomer unit derived from an alkyl (meth) acrylate having an alkyl group having 1 to 14 carbon atoms (formula (1) below). Such monomer units are suitable for obtaining a large initial adhesion. Further, in order to increase the relative permittivity of the components other than the ionic liquid of the adhesive layer and to increase the ionic conductivity and capacitance per unit area of the adhesive interface of the obtained adhesive layer, the electric peelability is improved, and the alkyl group R in the following formula (1) b The number of carbon atoms of (2) is preferably 8 or less, more preferably 4 or less.
CH 2 =C(R a )COOR b (1)
[ R in formula (1) a Is a hydrogen atom or methyl group, R b Is an alkyl group having 1 to 14 carbon atoms]
Examples of the alkyl (meth) acrylate having an alkyl group having 1 to 14 carbon atoms include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, sec-butyl (meth) acrylate, 1, 3-dimethylbutyl (meth) acrylate, pentyl (meth) acrylate, isopentyl (meth) acrylate, hexyl (meth) acrylate, 2-ethylbutyl (meth) acrylate, heptyl (meth) acrylate, n-octyl (meth) acrylate, isooctyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n-nonyl (meth) acrylate, isononyl (meth) acrylate, n-decyl (meth) acrylate, isodecyl (meth) acrylate, n-dodecyl (meth) acrylate, n-tridecyl (meth) acrylate, and n-tetradecyl (meth) acrylate. Among them, n-butyl acrylate, 2-ethylhexyl acrylate and isononyl acrylate are preferable. The alkyl (meth) acrylate having an alkyl group having 1 to 14 carbon atoms may be used alone or in combination of two or more.
The proportion of the alkyl (meth) acrylate having an alkyl group having 1 to 14 carbon atoms to the total monomer components (100 mass%) constituting the acrylic polymer is not particularly limited, but is preferably 70 mass% or more, more preferably 80 mass% or more, and still more preferably 85 mass% or more. When the ratio of the acrylic polymer is 70 mass% or more, a large initial adhesion is easily obtained.
The acrylic polymer preferably contains, in addition to monomer units derived from alkyl (meth) acrylate having an alkyl group having 1 to 14 carbon atoms, monomer units derived from a polar group-containing monomer copolymerizable therewith, in order to improve cohesive force, heat resistance, crosslinking property, and the like. The monomer units are capable of imparting cross-linking points suitable for obtaining a large initial adhesion. Further, it is preferable that the adhesive layer further contains a monomer unit derived from a polar group-containing monomer, from the viewpoints of increasing the relative dielectric constant of components other than the ionic liquid of the adhesive layer, and increasing the ionic conductivity and capacitance per unit area of the adhesive interface of the obtained adhesive layer to improve the electric peelability.
Examples of the polar group-containing monomer include carboxyl group-containing monomers, alkoxy group-containing monomers, hydroxyl group-containing monomers, cyano group-containing monomers, vinyl group-containing monomers, aromatic vinyl monomers, amide group-containing monomers, imide group-containing monomers, amino group-containing monomers, epoxy group-containing monomers, vinyl ether monomers, N-acryloylmorpholine, sulfo group-containing monomers, phosphoric acid group-containing monomers, and anhydride group-containing monomers. Among them, carboxyl group-containing monomers, alkoxy group-containing monomers, hydroxyl group-containing monomers, and amide group-containing monomers are preferable, and carboxyl group-containing monomers are particularly preferable, in view of excellent cohesiveness. Carboxyl group-containing monomers are particularly suitable for obtaining a large initial adhesion. The polar group-containing monomer may be used alone or in combination of two or more.
Examples of the carboxyl group-containing monomer include acrylic acid, methacrylic acid, carboxyethyl (meth) acrylate, carboxypentyl (meth) acrylate, itaconic acid, maleic acid, fumaric acid, crotonic acid, and isocrotonic acid. Acrylic acid is particularly preferred. The carboxyl group-containing monomer may be used alone or in combination of two or more.
Examples of the alkoxy group-containing monomer include methoxy group-containing monomers and ethoxy group-containing monomers. Examples of the methoxy group-containing monomer include 2-methoxyethyl acrylate.
Examples of the hydroxyl group-containing monomer include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate, 8-hydroxyoctyl (meth) acrylate, 10-hydroxydecyl (meth) acrylate, 12-hydroxylauryl (meth) acrylate, 4-hydroxymethylcyclohexyl) methyl (meth) acrylate, N-methylol (meth) acrylamide, vinyl alcohol, allyl alcohol, 2-hydroxyethyl vinyl ether, 4-hydroxybutyl vinyl ether, and diethylene glycol monovinyl ether. In particular, 2-hydroxyethyl (meth) acrylate and 4-hydroxybutyl (meth) acrylate are preferred. The hydroxyl group-containing monomers may be used singly or in combination of two or more.
Examples of the amide group-containing monomer include acrylamide, methacrylamide, N-vinylpyrrolidone, N-dimethylacrylamide, N-dimethylmethacrylamide, N-diethylacrylamide, N, N-diethyl methacrylamide, N' -methylene bisacrylamide, N-dimethylaminopropyl acrylamide, N-dimethylaminopropyl methacrylamide, diacetone acrylamide, and the like. The amide group-containing monomer may be used alone or in combination of two or more.
Examples of the cyano group-containing monomer include acrylonitrile and methacrylonitrile.
Examples of the vinyl-containing monomer include vinyl esters such as vinyl acetate, vinyl propionate and vinyl laurate, and particularly preferably vinyl acetate.
Examples of the aromatic vinyl monomer include styrene, chlorostyrene, chloromethylstyrene, α -methylstyrene, and other substituted styrenes.
Examples of the imide group-containing monomer include cyclohexylmaleimide, isopropylmaleimide, N-cyclohexylmaleimide, and itaconimide.
Examples of the amino group-containing monomer include aminoethyl (meth) acrylate, N-dimethylaminoethyl (meth) acrylate, and N, N-dimethylaminopropyl (meth) acrylate.
Examples of the epoxy group-containing monomer include glycidyl (meth) acrylate, methyl glycidyl (meth) acrylate, and allyl glycidyl ether.
Examples of the vinyl ether monomer include methyl vinyl ether, ethyl vinyl ether, and isobutyl vinyl ether.
The proportion of the polar group-containing monomer to the entire monomer component (100 mass%) constituting the acrylic polymer is preferably 0.1 mass% or more and 35 mass% or less. The upper limit of the proportion of the polar group-containing monomer is more preferably 25% by mass, still more preferably 20% by mass, and the lower limit is more preferably 0.5% by mass, still more preferably 1% by mass, and particularly preferably 2% by mass. When the proportion of the polar group-containing monomer is 0.1 mass% or more, the cohesive force is easily obtained, and therefore, the adhesive residue is less likely to occur on the surface of the adherend after the release of the adhesive layer, and the electrical peelability is improved. In addition, when the proportion of the polar group-containing monomer is 35 mass% or less, the pressure-sensitive adhesive layer is easily prevented from being excessively adhered to the adherend and being peeled again. In particular, when the amount is 2 mass% or more and 20 mass% or less, it is easy to achieve both of releasability from an adherend and adhesion of the pressure-sensitive adhesive layer to other layers.
In addition, as the monomer component constituting the acrylic polymer, a polyfunctional monomer may be included in order to introduce a crosslinked structure into the acrylic polymer and to easily obtain a desired cohesive force.
Examples of the polyfunctional monomer include ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate, 1, 6-hexanediol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, divinylbenzene, and N, N' -methylenebisacrylamide. The polyfunctional monomer may be used alone or in combination of two or more.
The content of the polyfunctional monomer is preferably 0.1 mass% or more and 15 mass% or less with respect to the total monomer components (100 mass%) constituting the acrylic polymer. The upper limit of the content of the polyfunctional monomer is more preferably 10 mass%, and the lower limit is more preferably 3 mass%. When the content of the polyfunctional monomer is 0.1 mass% or more, the flexibility and adhesiveness of the adhesive layer are preferably improved easily. When the content of the polyfunctional monomer is 15 mass% or less, the cohesive force does not become excessively high, and moderate adhesiveness is easily obtained.
The polyester polymer is typically a polymer having a structure obtained by condensing a polycarboxylic acid such as a dicarboxylic acid or a derivative thereof (hereinafter also referred to as "polycarboxylic acid monomer") with a polyhydric alcohol such as a diol or a derivative thereof (hereinafter also referred to as "polyhydric alcohol monomer").
Examples of the polycarboxylic acid monomer include, but are not particularly limited to, adipic acid, azelaic acid, dimer acid, sebacic acid, 1, 4-cyclohexanedicarboxylic acid, 1, 3-cyclohexanedicarboxylic acid, 1, 2-cyclohexanedicarboxylic acid, 4-methyl-1, 2-cyclohexanedicarboxylic acid, dodecenylsuccinic anhydride, fumaric acid, succinic acid, dodecanedioic acid, hexahydrophthalic anhydride, tetrahydrophthalic anhydride, maleic acid, maleic anhydride, itaconic acid, citraconic acid, derivatives thereof, and the like.
The polycarboxylic acid monomer may be used singly or in combination of two or more.
The polyhydric alcohol monomer is not particularly limited, and for example, ethylene glycol, 1, 2-propylene glycol, 1, 3-propylene glycol, 2-methyl-1, 3-propylene glycol, 1, 2-butanediol, 1, 3-butanediol, 1, 4-butanediol, 1, 5-pentanediol, 1, 6-hexanediol, 3-methyl-1, 5-pentanediol, neopentyl glycol, diethylene glycol, dipropylene glycol, 2, 4-trimethyl-1, 5-pentanediol, 2-ethyl-2-butylpropanediol, 1, 9-nonanediol, 2-methyl octanediol, 1, 10-decanediol, derivatives thereof, and the like can be used.
The polyhydric alcohol monomer may be used singly or in combination of two or more.
In addition, the polymer of the present embodiment may contain an ionic polymer. The ionic polymer is a polymer having an ionic functional group. Since the polymer contains an ionic polymer, the relative dielectric constant of the polymer increases, and the electrical peelability improves. In the case where the polymer contains an ionic polymer, the content of the ionic polymer is preferably 0.05 parts by mass or more and 2 parts by mass or less with respect to 100 parts by mass of the polymer.
In the present embodiment, the polymer can be obtained by (co) polymerizing monomer components. The polymerization method is not particularly limited, and examples thereof include solution polymerization, emulsion polymerization, bulk polymerization, suspension polymerization, photopolymerization (active energy ray polymerization), and the like. In particular, the solution polymerization method is preferable from the viewpoints of cost and productivity. In the case of copolymerization, the polymer may be a random copolymer, a block copolymer, an alternating copolymer, a graft copolymer, or the like.
The solution polymerization method is not particularly limited, and examples thereof include: a method in which a monomer component, a polymerization initiator, and the like are dissolved in a solvent, and heated to polymerize the monomer component and the polymerization initiator, thereby obtaining a polymer solution containing a polymer; etc.
As the solvent used in the solution polymerization method, various general solvents can be used. Examples of such solvents (polymerization solvents) include aromatic hydrocarbons such as toluene, benzene and xylene; esters such as ethyl acetate and n-butyl acetate; aliphatic hydrocarbons such as n-hexane and n-heptane; alicyclic hydrocarbons such as cyclohexane and methylcyclohexane; organic solvents such as ketones, e.g., methyl ethyl ketone and methyl isobutyl ketone. The solvent may be used alone or in combination of two or more.
The amount of the solvent is not particularly limited, but is preferably 10 parts by mass or more and 1000 parts by mass or less relative to the total monomer components (100 parts by mass) constituting the polymer. The upper limit of the amount of the solvent is more preferably 500 parts by mass, and the lower limit is more preferably 50 parts by mass.
The polymerization initiator used in the solution polymerization method is not particularly limited, and examples thereof include peroxide-based polymerization initiators, azo-based polymerization initiators, and the like. The peroxide-based polymerization initiator is not particularly limited, and examples thereof include peroxycarbonates, peroxyketones, peroxyketals, hydrogen peroxide, dialkyl peroxides, diacyl peroxides, and peroxyesters, and more specifically benzoyl peroxide, t-butyl hydroperoxide, di-t-butyl peroxide, t-butyl peroxybenzoate, dicumyl peroxide, 1-bis (t-butylperoxy) -3, 5-trimethylcyclohexane, and 1, 1-bis (t-butylperoxy) cyclododecane. The azo-based polymerization initiator is not particularly limited, examples thereof include 2,2 '-azobisisobutyronitrile, 2' -azobis-2-methylbutyronitrile, 2 '-azobis (2, 4-dimethylvaleronitrile), dimethyl 2,2' -azobis (2-methylpropionate), 2 '-azobis (4-methoxy-2, 4-dimethylvaleronitrile), 1' -azobis (cyclohexane-1-carbonitrile) 2,2 '-azobis (2, 4-trimethylpentane), 4' -azobis-4-cyanovaleric acid, 2 '-azobis (2-amidinopropane) dihydrochloride, 2' -azobis [2- (5-methyl-2-imidazolin-2-yl) propane ] dihydrochloride, 2 '-azobis (2-methylpropionamidine) disulfate, 2' -azobis (N, N '-dimethylene isobutyl amidine hydrochloride, 2' -azobis [ N- (2-carboxyethyl) -2-methylpropionamidine ] hydrate, and the like. The polymerization initiator may be used singly or in combination of two or more.
The amount of the polymerization initiator is not particularly limited, but is preferably 0.01 parts by mass or more and 5 parts by mass or less relative to the total monomer components (100 parts by mass) constituting the polymer. The upper limit of the amount of the polymerization initiator is more preferably 3 parts by mass, and the lower limit is more preferably 0.05 parts by mass.
The heating temperature in the polymerization by heating by the solution polymerization method is not particularly limited, and is, for example, 50℃to 80 ℃. The heating time is not particularly limited, and is, for example, 1 hour or more and 24 hours or less.
The weight average molecular weight of the polymer is not particularly limited, and is preferably 10 to 500 tens of thousands. The upper limit of the weight average molecular weight is more preferably 400 ten thousand, still more preferably 300 ten thousand, and the lower limit is more preferably 20 ten thousand, still more preferably 30 ten thousand. When the weight average molecular weight is 10 ten thousand or more, the problem of the occurrence of residual glue on the surface of the adherend after the release of the pressure-sensitive adhesive layer, which is caused by the decrease of the cohesive force, can be effectively suppressed. In addition, when the weight average molecular weight is 500 ten thousand or less, the problem that the wettability of the surface of the adherend after peeling the pressure-sensitive adhesive layer becomes insufficient can be effectively suppressed.
The weight average molecular weight is obtained by measurement by Gel Permeation Chromatography (GPC), and more specifically, for example, is calculated by using a standard polystyrene conversion value by measuring the weight average molecular weight using a trade name "HLC-8220GPC" (manufactured by eastern co.) as a GPC measurement device under the following conditions. (conditions for measuring weight average molecular weight)
Sample concentration: 0.2 mass% (tetrahydrofuran solution)
Sample injection amount: 10 mu L
Sample column: TSKguardcolumn SuperHZ-H (1 root) +TSKgel SuperHZM-H (2 roots)
Reference column: TSKgel SuperH-RC (1 root)
Eluent: tetrahydrofuran (THF)
Flow rate: 0.6mL/min
Detector: differential Refractometer (RI)
Column temperature (measurement temperature): 40 DEG C
The glass transition temperature (Tg) of the polymer is not particularly limited, but is preferably-10℃or less, more preferably-20℃or less, since the decrease in initial adhesion can be suppressed at 0 ℃. In addition, at-40 ℃ or less, the rate of decrease in adhesion due to voltage application becomes particularly large, so that it is particularly preferable, and most preferable is-50 ℃ or less.
The glass transition temperature (Tg) can be calculated, for example, based on the following formula (Y) (Fox formula).
1/Tg=W1/Tg1+W2/Tg2+……+Wn/Tgn(Y)
In the formula (Y), tg represents the glass transition temperature (unit: K) of the polymer, tgi (i=1, 2, … … n) represents the glass transition temperature (unit: K) of the monomer i when it forms a homopolymer, and Wi (i=1, 2, … … n) represents the mass fraction of the monomer i in the whole monomer components
The formula (Y) is a calculation formula when the polymer is composed of n monomer components, i.e., monomer 1, monomer 2, … …, and monomer n.
The glass transition temperature at the time of forming a homopolymer means the glass transition temperature of the homopolymer of the monomer, and means the glass transition temperature (Tg) of a polymer formed by using only a certain monomer (sometimes referred to as "monomer X") as a monomer component. Specifically, the values are listed in "Polymer Handbook" (3 rd edition, john Wiley & Sons, inc., 1989). The glass transition temperature (Tg) of the homopolymer not described in this document is, for example, a value obtained by the following measurement method. Specifically, 100 parts by mass of monomer X, 0.2 part by mass of 2,2' -azobisisobutyronitrile and 200 parts by mass of ethyl acetate as a polymerization solvent were charged into a reactor equipped with a thermometer, a stirrer, a nitrogen inlet pipe and a reflux condenser, and stirred for 1 hour while introducing nitrogen. After the oxygen in the polymerization system was thus removed, the temperature was raised to 63℃and allowed to react for 10 hours. Next, the mixture was cooled to room temperature to obtain a homopolymer solution having a solid content concentration of 33 mass%. Next, the homopolymer solution was cast on a release liner, and dried to prepare a test sample (sheet-like homopolymer) having a thickness of about 2 mm. Then, about 1 to 2mg of the test sample was weighed into an open cell made of aluminum, and the reversible heat flow (Reversing Heat Flow) (specific heat component) behavior of the homopolymer was obtained at a temperature-rising rate of 5℃per minute under a nitrogen atmosphere of 50ml/min using a temperature-modulated DSC (trade name "Q-2000", manufactured by TA Instruments Co.). The temperature at the point where a straight line equidistant from a straight line obtained by extending the low-temperature side base line and the high-temperature side base line of the obtained reversible heat flow in the longitudinal axis direction was intersected with the curve of the stepwise change portion of the glass transition was taken as the glass transition temperature (Tg) at the time of producing a homopolymer, with reference to JIS-K-7121.
The content of the polymer in the adhesive composition of the present embodiment is preferably 50 mass% or more and 99.9 mass% or less, more preferably 99.5 mass%, further preferably 99 mass%, and still more preferably 60 mass%, further preferably 70 mass%, with respect to the total amount (100 mass%) of the adhesive composition.
(Ionic liquid)
The ionic liquid in the present embodiment is not particularly limited as long as it is a molten salt (normal temperature molten salt) that is a liquid at 25 ℃. Examples of the anions and cations are listed below, but among the ionic substances obtained by combining them, the substances that are liquid at 25 ℃ are ionic liquids, and the substances that are solid at 25 ℃ are ionic solids described below, not ionic liquids.
Examples of anions of the ionic liquid include (FSO 2 ) 2 N - 、(CF 3 SO 2 ) 2 N - 、(CF 3 CF 2 SO 2 ) 2 N - 、(CF 3 SO 2 ) 3 C - 、Br - 、AlCl 4 - 、Al 2 Cl 7 - 、NO 3 - 、BF 4 - 、PF 6 - 、CH 3 COO - 、CF 3 COO - 、CF 3 CF 2 CF 2 COO - 、CF 3 SO 3 - 、CF 3 (CF 2 ) 3 SO 3 - 、AsF 6 - 、SbF 6 - And F (HF) n - Etc. Wherein, as anions, (FSO) 2 ) 2 N - [ bis (fluorosulfonyl) imide anion](CF) 3 SO 2 ) 2 N - [ bis (trifluoromethanesulfonyl) imide anion]The anions of the above-mentioned sulfonyl imide compound are preferable in view of being chemically stable and being suitable for improving the electrical peeling property.
Among the cations in the ionic liquid, nitrogen-containing onium, sulfur-containing onium and phosphorus-containing onium cations are preferable from the viewpoint of being chemically stable and suitable for improving the electrical separation property, and imidazolium-based, ammonium-based, pyrrolidinium-based and pyridinium-based cations are more preferable.
Examples of the imidazolium-based cation include 1-methylimidazolium cation, 1-ethyl-3-methylimidazolium cation, 1-propyl-3-methylimidazolium cation, 1-butyl-3-methylimidazolium cation, 1-pentyl-3-methylimidazolium cation, 1-hexyl-3-methylimidazolium cation, 1-heptyl-3-methylimidazolium cation, 1-octyl-3-methylimidazolium cation, 1-nonyl-3-methylimidazolium cation, 1-undecyl-3-methylimidazolium cation, 1-dodecyl-3-methylimidazolium cation, 1-tridecyl-3-methylimidazolium cation, 1-tetradecyl-3-methylimidazolium cation, 1-pentadecyl-3-methylimidazolium cation, 1-hexadecyl-3-methylimidazolium cation, 1-heptadecyl-3-methylimidazolium cation, 1-octadecyl-3-methylimidazolium cation, 1-undecyl-3-methylimidazolium cation, 1-dodecyl-3-methylimidazolium cation, and 1-docosylium (2, 1-docosylium-3-methylimidazolium cation).
Examples of the pyridinium-based cation include 1-butylpyridinium cation, 1-hexylpyridinium cation, 1-butyl-3-methylpyridinium cation, 1-butyl-4-methylpyridinium cation, and 1-octyl-4-methylpyridinium cation.
Examples of the pyrrolidinium cation include 1-ethyl-1-methylpyrrolidinium cation and 1-butyl-1-methylpyrrolidinium cation.
Examples of the ammonium cations include tetraethylammonium cation, tetrabutylammonium cation, methyltrioctylammonium cation, tetradecyltriahexyl ammonium cation, glycidyl trimethylammonium cation, and trimethylaminoethyl acrylate cation.
From the viewpoint of increasing the rate of decrease in adhesion upon voltage application, the ionic liquid is preferably one having a molecular weight of 160 or less, and particularly preferably one comprising the above (FSO 2 ) 2 N - [ bis (fluorosulfonyl) imide anion]Or (CF) 3 SO 2 ) 2 N - [ bis (trifluoromethanesulfonyl) imide anion]And a cation having a molecular weight of 160 or less. Examples of the cations having a molecular weight of 160 or less include 1-methylimidazolium cation, 1-ethyl-3-methylimidazolium cation, 1-propyl-3-methylimidazolium cation, 1-butyl-3-methylimidazolium cation, 1-pentyl-3-methylimidazolium cation, 1-butylpyridinium cation, 1-hexylpyridinium cation, 1-butyl-3-methylpyridinium cation, 1-butyl-4-methylpyridinium cation, 1-ethyl-1-methylpyrrolidinium cation, and 1-butyl-17- 1-methylpyrrolidinium cations, tetraethylammonium cations, glycidyl trimethylammonium cations, and trimethylaminoethyl acrylate cations.
The cations of the ionic liquid are also preferably cations represented by the following formulas (2-A) to (2-D).
[ chemical formula 1]
R in formula (2-A) 1 The hydrocarbon group having 4 to 10 carbon atoms (preferably hydrocarbon group having 4 to 8 carbon atoms, more preferably hydrocarbon group having 4 to 6 carbon atoms) may contain a hetero atom, R 2 R is R 3 The hydrocarbon group having 1 to 12 carbon atoms (preferably a hydrocarbon group having 1 to 8 carbon atoms, more preferably a hydrocarbon group having 2 to 6 carbon atoms, and even more preferably a hydrocarbon group having 2 to 4 carbon atoms) may contain a heteroatom. Wherein, in the case where the nitrogen atom forms a double bond with the adjacent carbon atom, R is absent 3 。
R in formula (2-B) 4 Represents a hydrocarbon group having 2 to 10 carbon atoms (preferably a hydrocarbon group having 2 to 8 carbon atoms, more preferably a hydrocarbon group having 2 to 6 carbon atoms), and may contain a hetero atom, R 5 、R 6 R is R 7 The hydrocarbon group having 1 to 12 carbon atoms (preferably a hydrocarbon group having 1 to 8 carbon atoms, more preferably a hydrocarbon group having 2 to 6 carbon atoms, and even more preferably a hydrocarbon group having 2 to 4 carbon atoms) may contain a heteroatom.
R in the formula (2-C) 8 Represents a hydrocarbon group having 2 to 10 carbon atoms (preferably a hydrocarbon group having 2 to 8 carbon atoms, more preferably a hydrocarbon group having 2 to 6 carbon atoms), and may contain a hetero atom, R 9 、R 10 R is R 11 The hydrocarbon group having 1 to 16 carbon atoms (preferably a hydrocarbon group having 1 to 10 carbon atoms, more preferably a hydrocarbon group having 1 to 8 carbon atoms) may contain a hetero atom.
X in the formula (2-D) represents a nitrogen, sulfur or phosphorus atom, R 12 、R 13 、R 14 R is R 15 The hydrocarbon group having 1 to 16 carbon atoms (preferably a hydrocarbon group having 1 to 14 carbon atoms, more preferably a hydrocarbon group having 1 to 10 carbon atoms, still more preferably a hydrocarbon group having 1 to 8 carbon atoms, particularly preferably a hydrocarbon group having 1 to 6 carbon atoms) may contain a hetero atom. Wherein, in the case where X is a sulfur atom, R is absent 12 。
The molecular weight of the cation in the ionic liquid is, for example, 500 or less, preferably 400 or less, more preferably 300 or less, further preferably 250 or less, particularly preferably 200 or less, and most preferably 160 or less. In addition, it is usually 50 or more. The cations in the ionic liquid are considered to have a property of moving to the cathode side in the adhesive layer upon voltage application and being biased near the interface of the adhesive layer and the adherend. Therefore, in the present invention, the adhesive force during voltage application is reduced with respect to the initial adhesive force, and electrical peelability is generated. In the case of a cation having a small molecular weight of 500 or less, the cation in the adhesive layer is more likely to move to the cathode side, and it is preferable to increase the rate of decrease in the adhesive force upon voltage application.
Examples of the commercially available ionic liquids include "ELEXCEL AS-110", "ELEXCEL MP-442", "ELEXCEL IL-210", "ELEXCEL MP-471", "ELEXCEL MP-456", "ELEXCEL AS-804", HMI-FSI ", 38 62, and" CIL-312 "and" CIL-313", respectively.
The ionic conductivity of the ionic liquid is preferably 0.1mS/cm or more and 10mS/cm or less. The upper limit of the ionic conductivity is more preferably 5mS/cm, still more preferably 3mS/cm, and the lower limit is more preferably 0.3mS/cm, still more preferably 0.5mS/cm. By having the ionic conductivity in this range, the adhesion can be sufficiently reduced even at a low voltage. The ion conductivity can be measured by an AC impedance method using, for example, a 1260 frequency response analyzer manufactured by Solartron corporation.
The content (amount of the ionic liquid) in the adhesive composition of the present embodiment is preferably 0.5 parts by mass or more in terms of reducing the adhesive force during voltage application, and preferably 30 parts by mass or less in terms of improving the initial adhesive force, relative to 100 parts by mass of the polymer. From the same viewpoint, it is more preferably 20 parts by mass or less, still more preferably 15 parts by mass or less, particularly preferably 10 parts by mass or less, and most preferably 5 parts by mass or less. Further, the amount is more preferably 0.6 parts by mass or more, still more preferably 0.8 parts by mass or more, particularly preferably 1.0 parts by mass or more, and most preferably 1.5 parts by mass or more.
(other Components)
The adhesive composition of the present embodiment may contain 1 or 2 or more components (hereinafter, sometimes referred to as "other components") other than the polymer and the ionic liquid as needed within a range that does not impair the effects of the present invention. Hereinafter, other components that may be contained in the adhesive composition of the present embodiment will be described.
The adhesive composition of the present embodiment may contain an ionic additive for the purpose of controlling the relative dielectric constant, ionic conductivity, and capacitance. As the ionic additive, for example, an ionic solid can be used.
The ionic solid is an ionic substance that is solid at 25 ℃. The ionic solid is not particularly limited, and for example, a solid substance out of ionic substances obtained by combining anions and cations exemplified in the description column of the ionic liquid can be used. When the binder composition contains an ionic solid, the content of the ionic solid is preferably 0.5 parts by mass or more, more preferably 1 part by mass or more, and further preferably 10 parts by mass or less, more preferably 5 parts by mass or less, and further preferably 2.5 parts by mass or less, relative to 100 parts by mass of the polymer.
The adhesive composition of the present embodiment may contain a crosslinking agent as needed for the purpose of improving creep and shearing properties by crosslinking the polymer. Examples of the crosslinking agent include isocyanate-based crosslinking agents, epoxy-based crosslinking agents, melamine-based crosslinking agents, peroxide-based crosslinking agents, urea-based crosslinking agents, metal alkoxide-based crosslinking agents, metal chelate-based crosslinking agents, metal salt-based crosslinking agents, oxazoline-based crosslinking agents, aziridine-based crosslinking agents, and amine-based crosslinking agents. Examples of the isocyanate-based crosslinking agent include toluene diisocyanate and methylene diphenyl isocyanate. Examples of the epoxy-based crosslinking agent include N, N' -tetraglycidyl m-xylylenediamine, diglycidyl aniline, 1, 3-bis (N, N-diglycidyl aminomethyl) cyclohexane, and 1, 6-hexanediol diglycidyl ether. The content of the crosslinking agent is preferably 0.1 part by mass or more, more preferably 0.7 part by mass or more, and further preferably 50 parts by mass or less, more preferably 10 parts by mass or less, and further preferably 3 parts by mass or less, based on 100 parts by mass of the polymer. It should be noted that the crosslinking agent may be used alone or in combination of two or more.
The adhesive composition of the present embodiment may contain polyethylene glycol or tetraethylene glycol dimethyl ether as necessary for the purpose of assisting movement of the ionic liquid upon voltage application. As polyethylene glycol or tetraethylene glycol dimethyl ether, a substance having a number average molecular weight of 100 to 6000 can be used. The content of these components is preferably 0.1 part by mass or more, more preferably 0.5 part by mass or more, further preferably 1 part by mass or more, and further preferably 30 parts by mass or less, more preferably 20 parts by mass or less, further preferably 15 parts by mass or less, based on 100 parts by mass of the polymer.
The adhesive composition of the present embodiment may contain a conductive filler as needed for the purpose of imparting conductivity to the adhesive composition. The conductive filler is not particularly limited, and a generally known or conventionally used conductive filler may be used, and for example, graphite, carbon black, carbon fiber, metal powder such as silver or copper, and the like may be used. The content of the conductive filler is preferably 0.1 parts by mass or more and 200 parts by mass or less relative to 100 parts by mass of the polymer.
The adhesive composition of the present embodiment may contain a preservative as needed for the purpose of inhibiting corrosion of the metal adherend. The preservative is not particularly limited, and commonly known or conventionally used preservatives can be used, and for example, carbodiimide compounds, adsorption inhibitors, chelate-forming metal deactivators, and the like can be used.
Examples of the carbodiimide compound include 1- [3- (dimethylamino) propyl ] -3-ethylcarbodiimide, 1-ethyl-3- (3-dimethylaminopropyl) carbo-diimide, N '-dicyclohexylcarbodiimide, N' -diisopropylcarbodiimide, 1-ethyl-3-tert-butylcarbodiimide, N-cyclohexyl-N '- (2-morpholinoethyl) carbodiimide, N' -di-tert-butylcarbodiimide, 1, 3-bis (p-tolyl) carbodiimide, and polycarbodiimide resins containing these compounds as monomers. These carbodiimide compounds may be used alone or in combination of two or more. The content of the carbodiimide compound in the adhesive composition of the present embodiment is preferably 0.01 parts by mass or more and 10 parts by mass or less with respect to 100 parts by mass of the polymer.
Examples of the adsorption inhibitor include alkylamines, carboxylates, carboxylic acid derivatives, and alkyl phosphates. The adsorption type inhibitor may be used singly or in combination of two or more. The content of the alkylamine in the adhesive composition according to the present embodiment is preferably 0.01 parts by mass or more and 20 parts by mass or less with respect to 100 parts by mass of the polymer. The content of the carboxylate in the adhesive composition of the present embodiment is preferably 0.01 parts by mass or more and 10 parts by mass or less with respect to 100 parts by mass of the polymer. The content of the carboxylic acid derivative in the adhesive composition of the present embodiment is preferably 0.01 parts by mass or more and 10 parts by mass or less with respect to 100 parts by mass of the polymer. The content of the alkyl phosphate in the adhesive composition of the present embodiment is preferably 0.01 parts by mass or more and 10 parts by mass or less with respect to 100 parts by mass of the polymer.
As the chelate forming metal deactivator, for example, a triazole group-containing compound or a benzotriazole group-containing compound can be used. These compounds are preferable because they have a high effect of passivating the surface of a metal such as aluminum, and they are less likely to affect adhesion even when contained in the adhesive component. The chelate-forming metal deactivator may be used alone or in combination of two or more. The content of the chelate-forming metal deactivator in the adhesive composition of the present embodiment is preferably 0.01 parts by mass or more and 20 parts by mass or less with respect to 100 parts by mass of the polymer.
The total content (blending amount) of the preservative is preferably 0.01 parts by mass or more and 30 parts by mass or less with respect to 100 parts by mass of the polymer.
In addition, the adhesive composition of the present embodiment may contain various additives such as a filler, a plasticizer, an anti-aging agent, an antioxidant, a pigment (dye), a flame retardant, a solvent, a surfactant (leveling agent), an antirust agent, a tackifying resin, and an antistatic agent. The total content of these components is not particularly limited as long as the effects of the present invention can be exerted, and is preferably 0.01 parts by mass or more and 20 parts by mass or less, more preferably 10 parts by mass or less, and still more preferably 5 parts by mass or less, relative to 100 parts by mass of the polymer.
Examples of the filler include silica, iron oxide, zinc oxide, aluminum oxide, titanium oxide, barium oxide, magnesium oxide, calcium carbonate, magnesium carbonate, zinc carbonate, pyrophyllite clay, kaolin clay, and calcined clay.
The plasticizer may be any known conventional plasticizer used in usual resin compositions and the like, and examples thereof include paraffin oil, processing oil and the like, liquid polyisoprene, liquid polybutadiene, liquid rubber such as liquid ethylene-propylene rubber and the like, tetrahydrophthalic acid, azelaic acid, benzoic acid, phthalic acid, trimellitic acid, pyromellitic acid, adipic acid, sebacic acid, fumaric acid, maleic acid, itaconic acid, citric acid, derivatives thereof, dioctyl phthalate (DOP), dibutyl phthalate (DBP), dioctyl adipate, diisononyl adipate (DINA), isodecyl succinate and the like.
Examples of the anti-aging agent include hindered phenol compounds, aliphatic and aromatic hindered amine compounds, and the like.
Examples of the antioxidant include Butylated Hydroxytoluene (BHT) and Butylated Hydroxyanisole (BHA).
Examples of the pigment include inorganic pigments such as titanium dioxide, zinc oxide, ultramarine, red lead, lithopone, lead, cadmium, iron, cobalt, aluminum, hydrochloride and sulfate; azo pigments, copper phthalocyanine pigments, and other organic pigments.
Examples of the rust inhibitor include zinc phosphate, tannic acid derivatives, phosphoric acid esters, alkali sulfonates, and various rust inhibitors.
Examples of the thickener include a titanium coupling agent and a zirconium coupling agent.
As the antistatic agent, a quaternary ammonium salt, a hydrophilic compound such as polyglycolic acid or an ethylene oxide derivative, and the like are generally mentioned.
Examples of the tackifying resin include a polyamide-based tackifying resin, an epoxy-based tackifying resin, an elastomer-based tackifying resin, and the like, in addition to a rosin-based tackifying resin, a terpene-based tackifying resin, a phenol-based tackifying resin, a hydrocarbon-based tackifying resin, and a ketone-based tackifying resin. It should be noted that the tackifying resin may be used alone or in combination of two or more.
< relative permittivity of adhesive layer containing no Ionic liquid >
The adhesive composition of embodiment 1 forms an adhesive layer (an adhesive layer containing no ionic liquid) from a composition (an adhesive composition containing no ionic liquid) composed of components other than ionic liquid among the components contained in the adhesive composition, and the adhesive layer has a relative dielectric constant of 5 or more at a frequency of 100Hz after being left for 3 days at 22 ℃ in an environment of 20% rh.
The relative permittivity refers to a relative permittivity measured in the following manner.
First, an adhesive composition containing no ionic liquid was uniformly coated on the release surface of the release-treated separator, and heat drying was performed at 130 ℃ for 3 minutes, thereby obtaining an adhesive layer containing no ionic liquid with a thickness of 30 μm. Next, the obtained adhesive layer containing no ionic liquid was left for 3 days at 22 ℃ in an environment of 20% rh. Thereafter, the relative dielectric constant was measured under the following conditions.
(conditions for measuring relative permittivity)
The measuring method comprises the following steps: capacitance method (apparatus: using Agilent Technologies 4294APrecision Impedance Analyzer)
The electrode is formed by: phi 12.1mm and 0.5mm thick aluminum plate
A counter electrode: aluminum foil 60 μm thick
Measurement environment: 23+ -1deg.C, 52+ -1% RH
The relative permittivity of an adhesive layer that does not contain an ionic liquid has a correlation with the ease of movement of the ionic liquid in an adhesive layer formed by an adhesive composition that contains an ionic liquid. The greater the relative permittivity of the adhesive layer containing no ionic liquid, the more likely the ionic liquid moves in the adhesive layer formed by the adhesive composition containing the ionic liquid, and therefore, the adhesion force tends to decrease when a voltage is applied.
In the adhesive composition of embodiment 1, since the relative dielectric constant of the adhesive layer at a frequency of 100Hz is 5 or more after the adhesive layer containing no ionic liquid is left for 3 days at 22 ℃ in an environment of 20% rh, adhesion with sufficiently reduced adhesion force by application of voltage can be formed even in a low humidity environment.
The relative dielectric constant of the adhesive layer containing no ionic liquid can be controlled, for example, by appropriately adjusting the components of the polymer in the adhesive composition, the kind and content of the ionic additive within the above-mentioned suitable range.
< capacitance per unit area of interface between adhesive layer and adherend >
In the adhesive composition according to embodiment 2, an adhesive layer was formed by using the adhesive composition and attached to an aluminum plate formed of A5052P H in JIS H4000:2014, and the capacitance per unit area of the interface between the adhesive layer and the aluminum plate after being left for 7 days in an environment of 22 ℃ and 15% RH was 0.9. Mu.F/cm 2 The release of the adhesive layerThe son conductivity is 10 mu S/m or more.
The ionic conductivity of the adhesive layer has a correlation with the ease of movement of the ionic liquid in the adhesive layer, the greater the ionic conductivity, the easier the ionic liquid moves. In addition, the capacitance per unit area of the interface between the adhesive layer and the adherend is related to the ease with which the ionic liquid is present at the interface between the adhesive layer and the adherend, and the greater the capacitance, the more easily the ionic liquid is present at the interface between the adhesive layer and the adherend in large amounts.
In the adhesive composition according to embodiment 2, an adhesive layer was formed by using the adhesive composition and attached to an aluminum plate formed of A5052P H in JIS H4000:2014, and the capacitance per unit area of the interface between the adhesive layer and the aluminum plate after being left for 7 days in an environment of 22 ℃ and 15% RH was 0.9. Mu.F/cm 2 Since the ionic conductivity of the pressure-sensitive adhesive layer is 10. Mu.S/m or more as described above, adhesion with sufficiently reduced adhesion strength by application of a voltage can be formed even in a low humidity environment. Further, it is more preferable that the capacitance per unit area is 1.2. Mu.F/cm 2 The ionic conductivity of the adhesive layer is 20. Mu.S/m or more.
The ionic conductivity and capacitance can be controlled, for example, by appropriately adjusting the components of the polymer, the type and content of the ionic liquid, and the type and content of the ionic additive in the adhesive composition within the above-mentioned suitable ranges.
The ionic conductivity and capacitance described above refer to ionic conductivity and capacitance measured as follows.
(production of sample for measurement (Complex sample))
First, an adhesive composition was uniformly applied to the aluminum deposition surface side of the aluminum deposition PET film 100 (trade name "metal TS", manufactured by tolay ADVANCED FILM). In this case, a part where the adhesive composition is not applied is provided locally so as to bring the electrode into contact with the aluminum deposition surface. Next, the adhesive layer 200 was formed by heat drying at 130 ℃ for 3 minutes, to obtain an adhesive sheet sample.
Thereafter, the adhesive surface of the obtained adhesive sheet sample was attached to an aluminum plate 300 (a 5052PH32 (JIS H4000: 2014)), to obtain a joined body sample 400 having a shape as shown in fig. 5 and 6. Fig. 5 is a side view, and fig. 6 is a top view.
(measurement of capacitance and ion conductivity)
For measurement of capacitance and ion conductivity, an LCR meter (for example, IM3533 manufactured by daily motor corporation) is used.
First, an ac voltage of 0.5V was applied between the aluminum plate 300 and the aluminum deposition surface of the aluminum deposition PET film 100 using an LCR meter, and the frequency was changed from 0.5Hz to 200kHz to obtain a cole-cole graph.
Next, the bulk of the adhesive layer 200 is regarded as the resistance component R adh And electrostatic capacitance component C adh Regarding the interface of the adhesive layer 200 as a resistance component R p And electrostatic capacitance component C dl As shown in fig. 7, an equivalent circuit of the joined body sample was set, and the obtained cole-cole graph was fitted by the following equation (a). The resistance component R 0 Is the wiring resistance.
[ mathematics 1]
In the formula (a), ω is an angular frequency.
By mixing the obtained C dl The capacitance per unit area of the interface between the adhesive layer 200 and the aluminum plate 300 can be obtained by dividing the area a of the adhesive surface of the adhesive layer 200.
Next, the resistance component R of the block of the adhesive layer 200 obtained by the formula (a) can be used adh The ionic conductivity σ of the adhesive layer was obtained by using the following formula (B).
[ math figure 2]
In the formula (B), l is the thickness of the adhesive layer, and a is the area of the adhesive surface of the adhesive layer 200.
< initial adhesive force, adhesive force decrease Rate due to Voltage application >
The adhesive strength of the adhesive composition of the present embodiment can be evaluated by various methods, for example, by the 180 ° peel test described in the column of examples.
In the adhesive composition of the present embodiment, the initial adhesion measured by forming an adhesive sheet and performing a 180 ° peel test as described in the examples in the columns is preferably 1.0N/cm or more, more preferably 1.5N/cm or more, still more preferably 2.0N/cm or more, particularly preferably 2.5N/cm or more, and most preferably 3.0N/cm or more. When the initial adhesion is 1.0N/cm or more, the adhesive strength with the adherend is sufficient, and the adherend is less likely to peel off and shift.
In addition, in the adhesive composition of the present embodiment, it is preferable that the adhesive sheet is formed as described in the column of examples, left for a predetermined time in an environment of a predetermined temperature and humidity, and after applying a voltage of 10V for 30 seconds, the adhesive force measured by 180 ° peel test is sufficiently small with respect to the initial adhesive force while applying a voltage of 10V.
That is, the adhesive force decrease rate obtained by the following formula (C) is preferably 60% or more, more preferably 70% or more, and even more preferably 80% or more, based on the adhesive force measured by the above method (in the following formula (C), only the adhesive force during voltage application is expressed as "adhesive force"), and the initial adhesive force. The above-mentioned predetermined temperature and humidity are preferably 22℃for 20% RH3 days, more preferably 22℃for 15% RH7 days.
Adhesive force decrease rate (%) = {1- (adhesive force during voltage application/initial adhesive force) } ×100 (C)
The voltage and the voltage application time at the time of the electric peeling are not limited to the above voltage and time, and are not particularly limited as long as the pressure-sensitive adhesive sheet can be peeled. Their suitable ranges are shown below.
The applied voltage is preferably 1V or more, more preferably 3V or more, and still more preferably 6V or more. Further, the voltage is preferably 100V or less, more preferably 50V or less, further preferably 30V or less, and particularly preferably 15V or less.
The voltage application time is preferably 60 seconds or less, more preferably 40 seconds or less, further preferably 20 seconds or less, and particularly preferably 10 seconds or less. In this case, workability is excellent. The shorter the application time, the better, but is usually 1 second or more.
< method for producing adhesive composition >
The adhesive composition of the present invention is not particularly limited, and can be produced by mixing a polymer, an ionic liquid, an additive, and a crosslinking agent, polyethylene glycol, a conductive filler, and the like, which are blended as needed, with stirring.
[ adhesive sheet ]
(constitution of adhesive sheet)
The pressure-sensitive adhesive sheet of the present embodiment is not particularly limited as long as it has at least one pressure-sensitive adhesive layer (hereinafter also referred to as "electrically-peelable pressure-sensitive adhesive layer") formed from the pressure-sensitive adhesive composition of the present embodiment. The pressure-sensitive adhesive sheet of the present embodiment may have an ionic liquid-free pressure-sensitive adhesive layer (hereinafter, sometimes referred to as "other pressure-sensitive adhesive layer") other than the electro-release pressure-sensitive adhesive layer. The pressure-sensitive adhesive sheet of the present embodiment may further include a base material, a conductive layer, a base material for electric conduction, an intermediate layer, a primer layer, and the like, in addition to the above. The pressure-sensitive adhesive sheet of the present embodiment may be wound in a roll form or a sheet form, for example. The term "pressure-sensitive adhesive sheet" also includes the meaning of "pressure-sensitive adhesive tape". That is, the pressure-sensitive adhesive sheet of the present embodiment may be a pressure-sensitive adhesive tape having a tape-like form.
The pressure-sensitive adhesive sheet of the present embodiment may be a double-sided pressure-sensitive adhesive sheet having no base material and including only an electrically-peelable pressure-sensitive adhesive layer, that is, having no base material layer (no base material). The pressure-sensitive adhesive sheet of the present embodiment may be a double-sided pressure-sensitive adhesive sheet having a base material and having a pressure-sensitive adhesive layer (an electrically-peelable pressure-sensitive adhesive layer or another pressure-sensitive adhesive layer) on both sides of the base material. The pressure-sensitive adhesive sheet of the present embodiment may be a single-sided pressure-sensitive adhesive sheet having a base material and having a pressure-sensitive adhesive layer (an electrically-peelable pressure-sensitive adhesive layer or another pressure-sensitive adhesive layer) on only one side of the base material. The pressure-sensitive adhesive sheet of the present embodiment may have a separator (release liner) for protecting the surface of the pressure-sensitive adhesive layer, but the separator is not included in the pressure-sensitive adhesive sheet of the present embodiment.
The structure of the pressure-sensitive adhesive sheet of the present embodiment is not particularly limited, and the pressure-sensitive adhesive sheet X1 shown in fig. 1, the pressure-sensitive adhesive sheet X2 shown in fig. 2 and the pressure-sensitive adhesive sheet X3 shown in fig. 3 are preferably given as examples. The adhesive sheet X1 is a base-material-free double-sided adhesive sheet including only the electrically-peelable adhesive layer 1. The pressure-sensitive adhesive sheet X2 is a double-sided pressure-sensitive adhesive sheet with a base material having a layer structure of a pressure-sensitive adhesive layer 2, a base material 5 for electric conduction (base material 3 and conductive layer 4), and an electrically-peelable pressure-sensitive adhesive layer 1. The pressure-sensitive adhesive sheet X3 is a double-sided pressure-sensitive adhesive sheet with a substrate having a layer structure of the pressure-sensitive adhesive layer 2, the substrate 5 for electric conduction (substrate 3 and conductive layer 4), the electrically-releasable pressure-sensitive adhesive layer 1, the substrate 5 for electric conduction (substrate 3 and conductive layer 4), and the pressure-sensitive adhesive layer 2. In the base material 5 for energizing the adhesive sheets X2 and X3 shown in fig. 2 and 3, the base material 3 is not necessarily required, and may be only the conductive layer 4. In addition, the pressure-sensitive adhesive sheet X2 in fig. 2 may be a single-sided pressure-sensitive adhesive sheet in which the pressure-sensitive adhesive layer 2 is not provided.
The substrate 3 is not particularly limited, and examples thereof include paper substrates such as paper, fiber substrates such as cloth and nonwoven fabric, plastic substrates such as films and sheets made of various plastics (polyolefin resins such as polyethylene and polypropylene, polyester resins such as polyethylene terephthalate, acrylic resins such as polymethyl methacrylate, and the like), and laminates thereof. The substrate may have a single layer or a multilayer structure. The substrate may be subjected to various treatments such as a back surface treatment, an antistatic treatment, and a primer treatment, as necessary.
The conductive layer 4 is not particularly limited as long as it is a layer having conductivity, and may be a metal (e.g., aluminum, magnesium, copper, iron, tin, gold, etc.) foil, a metal base material such as a metal plate (e.g., aluminum, magnesium, copper, iron, tin, silver, etc.), a conductive polymer, or the like, or may be a metal vapor-deposited film or the like provided on the base material 3.
The substrate for energization 5 is not particularly limited as long as it is a substrate having a conductive layer (energized), and examples thereof include substrates having a metal layer formed on the surface of the substrate exemplified above by a plating method, a chemical vapor deposition method, a sputtering method, and the like. The metal layer may be a metal, a metal plate, or a conductive polymer as exemplified above.
In the adhesive sheet X1, the double-sided adherend is preferably an adherend having a metal adherend surface. In the pressure-sensitive adhesive sheet X2, the adherend on the side of the electro-release pressure-sensitive adhesive layer 1 is preferably an adherend having a metal adherend surface.
The metal-coated surface is a surface having conductivity and formed of a metal containing aluminum, copper, iron, magnesium, tin, gold, silver, lead, or the like as a main component, for example. Examples of the adherend having a metal adherend surface include a sheet, a member, a plate, and the like, which are formed of a metal having aluminum, copper, iron, magnesium, tin, gold, silver, lead, and the like as a main component. Examples of the adherend other than the adherend having a metal adherend surface include, but are not particularly limited to, fibrous sheets such as paper, cloth and nonwoven fabric, films and sheets of various plastics, and the like.
From the viewpoint of initial adhesion, the thickness of the electro-release adhesive layer 1 is preferably 1 μm or more and 1000 μm or less. The upper limit of the thickness of the electro-release adhesive layer 1 is more preferably 500 μm, still more preferably 100 μm, particularly preferably 30 μm, and the lower limit is more preferably 3 μm, still more preferably 5 μm, particularly preferably 8 μm. In the case where the pressure-sensitive adhesive sheet is a base-material-free double-sided pressure-sensitive adhesive sheet (pressure-sensitive adhesive sheet X1 shown in fig. 1) including only 1 electrically-peelable pressure-sensitive adhesive layer, the thickness of the electrically-peelable pressure-sensitive adhesive layer is the thickness of the pressure-sensitive adhesive sheet.
From the viewpoint of adhesion, the thickness of the adhesive layer 2 is preferably 1 μm or more and 2000 μm or less. The upper limit of the thickness of the adhesive layer 2 is more preferably 1000 μm, still more preferably 500 μm, particularly preferably 100 μm, and the lower limit is more preferably 3 μm, still more preferably 5 μm, particularly preferably 8 μm.
The thickness of the base material 3 is preferably 10 μm or more and 1000 μm or less. The upper limit of the thickness is more preferably 500. Mu.m, still more preferably 300. Mu.m, particularly preferably 100. Mu.m, and the lower limit is more preferably 12. Mu.m, still more preferably 25. Mu.m.
The thickness of the conductive layer 4 is preferably 0.001 μm or more and 1000 μm or less. The upper limit of the thickness is more preferably 500. Mu.m, still more preferably 300. Mu.m, still more preferably 50. Mu.m, still more preferably 10. Mu.m, and the lower limit is more preferably 0.01. Mu.m, still more preferably 0.03. Mu.m, still more preferably 0.05. Mu.m.
The thickness of the base material 5 for electric conduction is preferably 10 μm or more and 1000 μm or less. The upper limit of the thickness is more preferably 500. Mu.m, still more preferably 300. Mu.m, particularly preferably 100. Mu.m, and the lower limit is more preferably 12. Mu.m, still more preferably 25. Mu.m.
The surface of the electrically-releasable adhesive layer of the adhesive sheet of the present embodiment, and the surface of the other adhesive layer can be protected by a separator (release liner). The separator is not particularly limited, and examples thereof include a release liner obtained by treating the surface of a substrate (liner substrate) such as paper or plastic film with an organic silicon, a release liner obtained by laminating the surface of a substrate (liner substrate) such as paper or plastic film with a polyolefin resin, and the like. The thickness of the separator is not particularly limited, and is preferably 10 μm or more and 100 μm or less.
The thickness of the pressure-sensitive adhesive sheet of the present embodiment is preferably 20 μm or more and 3000 μm or less. The upper limit of the thickness is more preferably 1000. Mu.m, still more preferably 300. Mu.m, particularly preferably 200. Mu.m, and the lower limit is more preferably 30. Mu.m, still more preferably 50. Mu.m.
In particular, in the case of the pressure-sensitive adhesive sheet X2 shown in FIG. 2, the thickness of the pressure-sensitive adhesive sheet is preferably 50 μm or more and 2000 μm or less. The upper limit of the thickness is more preferably 1000. Mu.m, still more preferably 200. Mu.m, and the lower limit is more preferably 80. Mu.m, still more preferably 100. Mu.m.
In particular, in the case of the pressure-sensitive adhesive sheet X3 shown in FIG. 3, the thickness of the pressure-sensitive adhesive sheet is preferably 100 μm or more and 3000 μm or less. The upper limit of the thickness is more preferably 1000. Mu.m, still more preferably 300. Mu.m, and the lower limit is more preferably 150. Mu.m, still more preferably 200. Mu.m.
(method for producing adhesive sheet)
The method for producing the pressure-sensitive adhesive sheet of the present embodiment may use a known or conventional production method. The electrically-peelable adhesive layer in the adhesive sheet of the present embodiment may be obtained by applying a solution obtained by dissolving the adhesive composition of the present embodiment in a solvent as needed to a separator, and drying and/or curing the same. The other adhesive layer may be formed by a method of applying a solution obtained by dissolving an adhesive composition containing no ionic liquid and additives in a solvent as needed to a separator, and drying and/or curing the same. The solvent and the separator may be those listed above.
In the application, a conventional coater (e.g., gravure roll coater, reverse roll coater, contact roll coater, dip roll coater, bar coater, knife coater, spray roll coater, etc.) can be used.
The above method can produce an electrically-peelable adhesive layer and other adhesive layers, and the electrically-peelable adhesive layer and other adhesive layers can be laminated appropriately on the substrate, the conductive layer, and the base material for electric conduction, whereby the adhesive sheet of the present embodiment can be produced. The pressure-sensitive adhesive sheet may be produced by coating the pressure-sensitive adhesive composition with a base material, a conductive layer, and an energizing base material instead of the separator.
(method of electrically peeling adhesive sheet)
The release of the pressure-sensitive adhesive sheet of the present embodiment from the adherend can be performed by: by applying a voltage to the electro-release adhesive layer, a potential difference is generated in the thickness direction of the electro-release adhesive layer. For example, in the case where the adhesive sheet X1 has an adherend having metal adherend surfaces on both sides, the pressure-sensitive adhesive layer can be peeled by applying a voltage to the metal adherend surfaces on both sides by applying electricity to the metal adherend surfaces. When the pressure-sensitive adhesive sheet X2 has an adherend having a metal adherend surface on the side of the electrically-peelable pressure-sensitive adhesive layer, the electrically-peelable pressure-sensitive adhesive layer can be peeled by applying a voltage to the electrically-conductive adherend and the electrically-conductive layer 4. In the case of the pressure-sensitive adhesive sheet X3, the electrically-peeling type pressure-sensitive adhesive layer can be peeled by applying a voltage to the electrically-peeling type pressure-sensitive adhesive layer by applying electricity to the double-sided conductive layer 4. The energization is preferably performed by connecting the terminal to one end and the other end of the pressure-sensitive adhesive sheet, and applying a voltage to the entire electrically-peeling pressure-sensitive adhesive layer. In the case where the adherend has a metal adherend surface, the one end and the other end may be part of the adherend having a metal adherend surface. In the peeling, water may be added to the interface between the metal adherend surface and the electrically-peeling adhesive layer, and then a voltage may be applied.
(use of adhesive sheet)
As a conventional re-peeling technique, there are an adhesive layer peeled by curing with Ultraviolet (UV) irradiation and an adhesive layer peeled by heat. The pressure-sensitive adhesive sheet using such a pressure-sensitive adhesive layer cannot be used in cases where Ultraviolet (UV) irradiation is difficult, in cases where a member as an adherend is damaged by heat, or the like. The pressure-sensitive adhesive sheet of the present embodiment, which includes the above-described electrically-peelable pressure-sensitive adhesive layer, does not use ultraviolet light or heat, and therefore does not damage a member as an adherend, and can be easily peeled off by applying a voltage. Therefore, the adhesive sheet of the present embodiment is suitable for use in fixing a secondary battery (for example, a lithium ion battery pack) used in a mobile terminal such as a smart phone, a mobile phone, a notebook computer, a video camera, and a digital camera to a case.
Examples of the rigid member to be bonded by the adhesive sheet of the present embodiment include a silicon substrate for semiconductor wafers, a sapphire substrate for LEDs, a SiC substrate and a metal base substrate, a TFT substrate and a filter substrate for displays, and a base substrate for organic EL panels. Examples of the fragile member to be bonded by the double-sided adhesive sheet include a semiconductor substrate such as a compound semiconductor substrate, a silicon substrate for MEMS devices, a passive matrix substrate, a surface cover glass for smart phones, an OGS (One Glass Solution, monolithic glass solution) substrate including a touch panel sensor attached to the cover glass, an organic substrate and an organic-inorganic hybrid substrate including silsesquioxane as a main component, a flexible glass substrate for flexible displays, and a graphene sheet.
[ Joint body ]
The joined body according to the present embodiment has a laminated structure portion including: an adherend having a metal adherend surface, and an adhesive sheet having an electrically-releasable adhesive layer bonded to the metal adherend surface. Examples of the adherend having a metal adherend surface include an adherend formed of a metal having aluminum, copper, iron, magnesium, tin, gold, silver, lead, or the like as a main component, and among these, a metal containing aluminum is preferable.
Examples of the joined body according to the present embodiment include: a bonded body which is an adhesive sheet X1 and has an adherend having a metal adherend surface on both sides of an electrically-releasable adhesive layer 1; an adhesive sheet X2, and a bonded body comprising an adherend having a metal adherend surface on the side of an electrically-releasable adhesive layer 1 and an adherend on the side of an adhesive layer 2; a bonded body which is an adhesive sheet X3 and has an adherend on both sides of an adhesive layer 2; etc.
Examples
Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples. The weight average molecular weight described below was measured by Gel Permeation Chromatography (GPC) using the method described above.
Examples 1-1 to 1-8 and comparative examples 1-1 to 1-5
< preparation of Polymer solution >
(preparation of acrylic Polymer 1 solution)
n-Butyl Acrylate (BA) as a monomer component: 95 parts by mass of Acrylic Acid (AA): 5 parts by mass of ethyl acetate as a polymerization solvent: 150 parts by mass of the mixture was charged into a separable flask, and the mixture was stirred for 1 hour while introducing nitrogen gas. After oxygen in the polymerization system was removed in this manner, 2' -Azobisisobutyronitrile (AIBN) was added as a polymerization initiator: 0.2 part by mass, heated to 63℃and reacted for 6 hours. Thereafter, ethyl acetate was added to obtain an acrylic polymer 1 solution having a solid content concentration of 40 mass%.
(preparation of acrylic Polymer 2 solution)
n-Butyl Acrylate (BA) as a monomer component: 90 parts by mass of 4-hydroxybutyl acrylate (4 HBA): 10 parts by mass of ethyl acetate as a polymerization solvent: 150 parts by mass of the mixture was charged into a separable flask, and the mixture was stirred for 1 hour while introducing nitrogen gas. After oxygen in the polymerization system was removed in this manner, 2' -Azobisisobutyronitrile (AIBN) was added as a polymerization initiator: 0.2 part by mass, heated to 63℃and reacted for 6 hours. Thereafter, ethyl acetate was added to obtain an acrylic polymer 2 solution having a solid content concentration of 30 mass%.
(preparation of acrylic Polymer 3 solution)
n-Butyl Acrylate (BA) as a monomer component: 67 parts by mass of 2-methoxyethyl acrylate (MEA): 30 parts by mass of Acrylic Acid (AA): 3 parts by mass of ethyl acetate as a polymerization solvent: 150 parts by mass of the mixture was charged into a separable flask, and the mixture was stirred for 1 hour while introducing nitrogen gas. After oxygen in the polymerization system was removed in this manner, 2' -Azobisisobutyronitrile (AIBN) was added as a polymerization initiator: 0.2 part by mass, heated to 63℃and reacted for 6 hours. Thereafter, ethyl acetate was added to obtain an acrylic polymer 3 solution having a solid content concentration of 40 mass%.
(preparation of acrylic Polymer 4 solution)
n-Butyl Acrylate (BA) as a monomer component: 67 parts by mass of Methyl Methacrylate (MMA): 33 parts by mass of ethyl acetate as a polymerization solvent: 150 parts by mass of the mixture was charged into a separable flask, and the mixture was stirred for 1 hour while introducing nitrogen gas. After oxygen in the polymerization system was removed in this manner, 2' -Azobisisobutyronitrile (AIBN) was added as a polymerization initiator: 0.2 part by mass, heated to 63℃and reacted for 6 hours. Thereafter, ethyl acetate was added to obtain an acrylic polymer 4 solution having a solid content concentration of 40 mass%.
(preparation of acrylic Polymer 5 solution)
n-Butyl Acrylate (BA) as a monomer component: 87 parts by mass of 4-hydroxybutyl acrylate (4 HBA): 10 parts by mass of Acrylic Acid (AA): 3 parts by mass of ethyl acetate as a polymerization solvent: 150 parts by mass of the mixture was charged into a separable flask, and the mixture was stirred for 1 hour while introducing nitrogen gas. After oxygen in the polymerization system was removed in this manner, 2' -Azobisisobutyronitrile (AIBN) was added as a polymerization initiator: 0.2 part by mass, heated to 63℃and reacted for 6 hours. Thereafter, ethyl acetate was added to obtain an acrylic polymer 5 solution having a solid content concentration of 30 mass%.
< preparation of adhesive composition >
The acrylic polymer solution obtained above, the polymer shown below, the crosslinking agent, the ionic liquid, and the additive were added and stirred and mixed to obtain adhesive compositions of examples 1-1 to 1-8 and comparative examples 1-1 to 1-5. The amounts of the components are shown in Table 1.
The values of the components in table 1 refer to parts by mass. The blending amount (parts by mass) of the polymer means the blending amount (parts by mass) of the solid component in the polymer solution.
The abbreviations for the polymers, crosslinkers, ionic liquids and additives in Table 1 are as follows.
(Polymer)
vYLON UR-V8700: urethane-modified polyester resin, trade name "VYLON UR-V8700", manufactured by eastern spinning corporation
VYLON BX1001: polyester resin, trade name "VYLON BX1001", manufactured by eastern spinning corporation
SOMAREX 530: anionic Polyacrylamide Polymer (ionic Polymer), trade name "SOMAREX 530", manufactured by SOMAR Corp
(Ionic liquid)
AS-110: cation: 1-ethyl-3-methylimidazolium cation, anion: bis (fluorosulfonyl) imide anion, trade name "ELEXCEL AS-110", manufactured by first Industrial pharmaceutical Co., ltd
(crosslinking agent)
V-05: polycarbodiimide resin, trade name "CARBODILITE V-05", manufactured by Nisshink chemical Co., ltd
TAKENATE D110: trimethylolpropane xylylene diisocyanate, trade name "TAKENATE D N", manufactured by Mitsui chemical Co., ltd
(additive)
EMI-nitrate: 1-ethyl-3-methylimidazolium nitrate, manufactured by Tokyo chemical industry Co., ltd
Zn-nitrate: zinc nitrate hexahydrate, manufactured by Wako pure chemical industries, ltd
BTC-5B: barium titanate
No.27776: carbon black
< measurement of relative permittivity of adhesive layer containing no Ionic liquid >
The materials were stirred and mixed in the same manner as in examples 1-1 to 1-8 and comparative examples 1-1 to 1-5 except that the ionic liquid was not added, and the obtained adhesive composition containing no ionic liquid was applied to the release-treated surface of the release-treated polyethylene terephthalate separator (trade name "MRF38", manufactured by Mitsubishi resin Co.) in a uniform thickness using an applicator. Next, heat drying was performed at 130℃for 3 minutes to obtain an ionic liquid-free adhesive layer having a thickness of 30. Mu.m. Next, the obtained adhesive layer containing no ionic liquid was left to stand at 22 ℃ for 3 days in an environment of 20% rh, and then the relative dielectric constant of the adhesive layer at a frequency of 100kHz was measured under the following conditions in accordance with JIS K6911.
(measurement conditions)
The measuring method comprises the following steps: capacitance method (apparatus: using Agilent Technologies 4294APrecision Impedance Analyzer)
The electrode is formed by: phi 12.1mm and 0.5mm thick aluminum plate
A counter electrode: 3oz copper plate
Measurement environment: 23+ -1deg.C, 52+ -1% RH
< measurement of moisture content of electric Release adhesive layer >
The pressure-sensitive adhesive layers obtained in the same manner as described above were left to stand in an atmosphere of 20% RH at 22℃for 3 days using the pressure-sensitive adhesive compositions of the respective examples, and then the water content of the pressure-sensitive adhesive layers was measured by the Karl Fischer moisture evaporation-coulometric titration method (JIS K0113:2005). Specifically, a trace methane water content measuring apparatus AQ-2100 manufactured by methane industry corporation was used to measure the amount of water produced by heating and gasification at 200 ℃ for 30 minutes, and the ratio of the amount of water to the weight of the sample before heating was used as the water content. That is, the water content was determined by the following formula. In table 1, "-" means not measured.
Water content (%) = (karl fischer determination moisture amount/total weight of sample before determination) ×100
< evaluation >
(initial adhesive force)
The adhesive compositions of each example were applied to the release treated surface of a release treated polyethylene terephthalate separator (trade name "MRF38", manufactured by mitsubishi resin company) using an applicator so as to have a uniform thickness. Next, the resulting film was dried by heating at 130℃for 3 minutes to obtain an electrically-released adhesive layer (adhesive sheet) having a thickness of 30. Mu.m.
Next, the obtained electro-release adhesive layer (adhesive sheet) was formed into a sheet having a size of 10mm×80mm, and a metal layer-coated film (trade name "BR1075", manufactured by tolay ADVANCED FILM, inc.) as a base material was laminated on the separator-free surface to form a metal layer having a thickness of 25 μm and a size of 10mm×100mm, thereby forming a single-sided adhesive sheet with a base material. The separator of the single-sided pressure-sensitive adhesive sheet with a base material was peeled off, an aluminum plate (A5052P H (JIS H4000: 2014)) as an adherend was attached to the peeled off surface so that one end of the pressure-sensitive adhesive sheet protruded from the adherend by about 2mm, and the sheet was repeatedly pressed once by a 2kg roller and left under an environment of 23℃for 30 minutes, to obtain a bonded body comprising an aluminum plate 6/an electrically-peeled pressure-sensitive adhesive layer (pressure-sensitive adhesive sheet) 1 '/a film with a metal layer (base material for electric conduction) 5'. Fig. 4 schematically shows the joined body. Thereafter, the film was peeled off in the direction of the arrow in FIG. 4 by a peeling tester (trade name "variable angle peeling tester YSP", manufactured by Asahi Seiko Co., ltd.) to measure the adhesion in a 180℃peeling test (stretching speed: 300mm/min, peeling temperature: 23 ℃). The measurement results are shown in Table 1.
(adhesive force during Voltage application)
After being repeatedly pressed once by a 2kg roller, the laminate was left to stand in an environment of 22℃and 20% RH for 3 days, and before peeling, the negative electrode and positive electrode of a DC current machine were respectively attached to the α and β in FIG. 4 of the joined body, and a voltage was applied at 10V for 30 seconds, and peeling was performed while applying a voltage in this state, and the adhesion during voltage application was measured in the same manner as the initial adhesion measurement described above except for these points. The measurement results are shown in Table 1.
(adhesive force reduction Rate)
Using the initial adhesion and the adhesion during voltage application measured by the above method, the adhesion decrease rate due to voltage application was determined by the following formula (C). The results are shown in Table 1.
Adhesive force decrease rate (%) = {1- (adhesive force during voltage application/initial adhesive force) } ×100 (C) [ table 1]
The adhesive compositions of examples 1-1 to 1-8, in which the adhesive layer was formed from a composition comprising components other than the ionic liquid, and the adhesive layer was left for 3 days at 22℃and 20% RH, and the relative dielectric constant of the adhesive layer at a frequency of 100Hz was 5 or more, exhibited a large decrease in adhesive strength due to voltage application.
Examples 2-1 to 2-11 and comparative examples 2-1 to 2-3
< preparation of Polymer solution >
(preparation of acrylic Polymer 6 solution)
n-Butyl Acrylate (BA) as a monomer component: 90 parts by mass of Acrylic Acid (AA): 10 parts by mass of ethyl acetate as a polymerization solvent: 150 parts by mass of the mixture was charged into a separable flask, and the mixture was stirred for 1 hour while introducing nitrogen gas. After oxygen in the polymerization system was removed in this manner, 2' -Azobisisobutyronitrile (AIBN) was added as a polymerization initiator: 0.2 part by mass, heated to 63℃and reacted for 6 hours. Thereafter, ethyl acetate was added to obtain an acrylic polymer 6 solution having a solid content concentration of 40 mass%.
(preparation of acrylic Polymer 7 solution)
n-Butyl Acrylate (BA) as a monomer component: 90 parts by mass of 4-hydroxybutyl acrylate (4 HBA): 7 parts by mass of Acrylic Acid (AA): 3 parts by mass of ethyl acetate as a polymerization solvent: 150 parts by mass of the mixture was charged into a separable flask, and the mixture was stirred for 1 hour while introducing nitrogen gas. After oxygen in the polymerization system was removed in this manner, 2' -Azobisisobutyronitrile (AIBN) was added as a polymerization initiator: 0.2 part by mass, heated to 63℃and reacted for 6 hours. Thereafter, ethyl acetate was added to obtain an acrylic polymer 7 solution having a solid content concentration of 30 mass%.
(preparation of acrylic Polymer 8 solution)
n-Butyl Acrylate (BA) as a monomer component: 94 parts by mass of 4-hydroxybutyl acrylate (4 HBA): 3 parts by mass of Acrylic Acid (AA): 3 parts by mass of ethyl acetate as a polymerization solvent: 150 parts by mass of the mixture was charged into a separable flask, and the mixture was stirred for 1 hour while introducing nitrogen gas. After oxygen in the polymerization system was removed in this manner, 2' -Azobisisobutyronitrile (AIBN) was added as a polymerization initiator: 0.2 part by mass, heated to 63℃and reacted for 6 hours. Thereafter, ethyl acetate was added to obtain an acrylic polymer 8 solution having a solid content concentration of 30 mass%.
(preparation of acrylic Polymer 9 solution)
n-Butyl Acrylate (BA) as a monomer component: 77 parts by mass of 2-methoxyethyl acrylate (MEA): 20 parts by mass of Acrylic Acid (AA): 3 parts by mass of ethyl acetate as a polymerization solvent: 150 parts by mass of the mixture was charged into a separable flask, and the mixture was stirred for 1 hour while introducing nitrogen gas. After oxygen in the polymerization system was removed in this manner, 2' -Azobisisobutyronitrile (AIBN) was added as a polymerization initiator: 0.2 part by mass, heated to 63℃and reacted for 6 hours. Thereafter, ethyl acetate was added to obtain an acrylic polymer 9 solution having a solid content concentration of 40 mass%.
(preparation of acrylic Polymer 10 solution)
n-Butyl Acrylate (BA) as a monomer component: 87 parts by mass of 2-methoxyethyl acrylate (MEA): 10 parts by mass of Acrylic Acid (AA): 3 parts by mass of ethyl acetate as a polymerization solvent: 150 parts by mass of the mixture was charged into a separable flask, and the mixture was stirred for 1 hour while introducing nitrogen gas. After oxygen in the polymerization system was removed in this manner, 2' -Azobisisobutyronitrile (AIBN) was added as a polymerization initiator: 0.2 part by mass, heated to 63℃and reacted for 6 hours. Thereafter, ethyl acetate was added to obtain an acrylic polymer 10 solution having a solid content concentration of 40 mass%.
< preparation of adhesive composition >
The acrylic polymer solution obtained in the above, the above polymer, the crosslinking agent, the ionic liquid, the additive, or the ionic liquid and the preservative described below were added and stirred and mixed to obtain the adhesive compositions of examples 2-1 to 2-11 and comparative examples 2-1 to 2-3. The amounts of the components are shown in Table 2.
(Ionic liquid)
1-hexyl-pyridinium-bis (trifluoromethylsulfonyl) imide
(preservative, additive, crosslinking agent)
Irgamet30: n, N-bis (2-ethylhexyl) -1,2, 4-triazole-1-methanamine, trade name "Irgamet30", manufactured by BASF corporation
IrgacorDSSG: disodium sebacate, trade name "Irgacor DSSG", manufactured by BASF corporation
AminO o: imidazoline derivatives, trade name "Amin O", manufactured by BASF corporation
PEG400: polyethylene glycol, trade name "PEG400", cornonate L, tokyo chemical industry company: isocyanate compound, trade name "Coronate L", manufactured by Tosoh Corp
< measurement of ion conductivity of adhesive layer and capacitance per unit area >
A measurement sample (composite sample) was prepared using the adhesive compositions of each example, and the capacitance of the adhesive interface and the ionic conductivity of the adhesive layer were determined by the following method. The results are shown in Table 2.
(production of sample for measurement (Complex sample))
First, an adhesive composition was uniformly applied to the aluminum deposition surface side of the aluminum deposition PET film 100 (trade name "metal TS", manufactured by tolay ADVANCED FILM). In this case, a part where the adhesive composition is not applied is provided locally so as to bring the electrode into contact with the aluminum deposition surface. Next, the adhesive layer 200 was formed by heat drying at 130 ℃ for 3 minutes, and an adhesive sheet sample was obtained.
Thereafter, the adhesive surface of the obtained adhesive sheet sample was attached to an aluminum plate 300 (a 5052PH32 (JIS H4000: 2014)), to obtain a joined body sample 400 having a shape as shown in fig. 5 and 6. Fig. 5 is a side view, and fig. 6 is a top view.
(measurement of capacitance and ion conductivity)
For measurement of capacitance and ion conductivity, an LCR meter (for example, IM3533 manufactured by daily motor corporation) is used.
First, an ac voltage of 0.5V was applied between the aluminum plate 300 and the aluminum deposition surface of the aluminum deposition PET film 100 using an LCR meter, and the frequency was changed from 0.5Hz to 200kHz, thereby obtaining a cole-cole graph.
Next, the bulk of the adhesive layer 200 is regarded as the resistance component R adh And electrostatic capacitance component C adh Regarding the interface of the adhesive layer 200 as a resistance component R p And electrostatic capacitance component C dl As shown in fig. 7, an equivalent circuit of the joined body sample was set, and the obtained cole-cole graph was fitted by the following equation (a). The resistance component R 0 Is the wiring resistance.
[ math 3]
In the formula (a), ω is an angular frequency.
By mixing the obtained C dl The capacitance per unit area of the interface between the adhesive layer 200 and the aluminum plate 300 was determined by dividing the area a of the adhesive surface of the adhesive layer 200.
Next, the resistance component R of the block of the adhesive layer 200 obtained by the formula (a) is used adh The ionic conductivity σ of the adhesive layer was obtained by using the following formula (B).
[ mathematics 4]
In the formula (B), l is the thickness of the adhesive layer, and a is the area of the adhesive surface of the adhesive layer 200.
< evaluation >
(initial adhesive force)
The initial adhesion was measured in the same manner as in examples 1-1 to 1-8 and comparative examples 1-1 to 1-5 except that an aluminum vapor deposited PET film (trade name "MetalumTS", manufactured by TORAY ADVANCED FILM Co.) was used as a base material for each adhesive composition and an adhesive layer was formed on the aluminum vapor deposited surface. The measurement results are shown in Table 2.
(adhesive force during voltage application after 3 days of storage at 22 ℃ C., 20% RH)
After being repeatedly pressed once by a 2kg roller, the laminate was left to stand in an environment of 22℃and 20% RH for 3 days, and before peeling, the negative electrode and positive electrode of a DC machine were respectively attached to the α and β in FIG. 4 of the joined body, and a voltage was applied at 10V for 30 seconds, and peeling was performed while applying a voltage in this state, except that the adhesion during voltage application was measured in the same manner as the initial adhesion measurement described above, and the electrical peelability was evaluated based on the following criteria. The measurement results are shown in Table 2.
O: the adhesive strength reduction rate is 60% or more.
X: the adhesive force reduction rate is less than 60%.
(adhesive force during voltage application after 7 days of storage at 22 ℃ C., 15% RH)
After being repeatedly pressed once by a 2kg roller, the laminate was left to stand in an environment of 22℃and 15% RH for 7 days, and before peeling, the negative electrode and positive electrode of a DC current machine were attached to the laminate at a and a in FIG. 4, respectively, and a voltage was applied at 10V for 10 seconds, and peeling was performed while applying a voltage in this state, and the adhesive force during the voltage application was measured in the same manner as the initial adhesive force measurement. The measurement results are shown in Table 2.
(adhesive force reduction Rate)
The initial adhesion measured by the above method was used to determine the adhesion decrease rate by voltage application using the following formula (C) using the adhesion during voltage application after storage for 7 days at 22 ℃ and 15% rh.
The results are shown in Table 2.
Adhesive force decrease rate (%) = {1- (adhesive force during voltage application/initial adhesive force) } ×100 (C) [ table 2]
Regarding the formation of an adhesive layer with an adhesive composition and attaching it to an aluminum plate formed of A5052P H32 in JIS H4000:2014, and the capacitance per unit area of the interface of the adhesive layer and the aluminum plate after leaving for 7 days at 22℃in an environment of 15% RH was 0.9. Mu.F/cm 2 The adhesive compositions of examples 2-1 to 2-11 in which the ionic conductivity of the adhesive layer was 10. Mu.S/m or more showed a large decrease in adhesion due to voltage application.
Examples 3-1 to 3-5
< preparation of Polymer solution >
(preparation of acrylic Polymer 11 solution)
2-methoxyethyl acrylate (MEA) as monomer component: 95 parts by mass of 4-hydroxybutyl acrylate (4 HBA): 5 parts by mass of the mixture was put into a separable flask, and the flask was stirred for 1 hour while introducing nitrogen gas. After oxygen in the polymerization system was removed in this manner, 2' -Azobisisobutyronitrile (AIBN) was added as a polymerization initiator: 0.2 part by mass, heated to 63℃and reacted for 6 hours. Thereafter, ethyl acetate was added to obtain an acrylic polymer 11 solution having a solid content concentration of 30 mass%.
< preparation of adhesive composition >
The acrylic polymer solution obtained in the above, the above polymer, the crosslinking agent, the ionic liquid, the additive, or the following additive was added and stirred and mixed to obtain the adhesive compositions of examples 3-1 to 3-5. The amounts of the components are shown in Table 3.
(additive)
·EMIM-MeSO 3 : ionic additives, imidazolium salts, manufactured by tokyo chemical industry company.
EPOMIN200: polyethylene imine, manufactured by japan catalyst.
< measurement and evaluation of ion conductivity and capacitance per unit area of adhesive layer >
The initial adhesion, the adhesion and the adhesive strength decrease rate in the voltage application after 3 days of storage in an atmosphere of 20% RH at 22℃and the adhesion and adhesive strength decrease rate in the voltage application after 7 days of storage in an atmosphere of 15% RH at 22℃were measured in the same manner as in examples 2-1 to 2-11 and comparative examples 2-1 to 2-3. In addition, in the same manner as in examples 2-1 to 2-11 and comparative examples 2-1 to 2-3, a sample for measurement (composite sample) was prepared, and the capacitance of the adhesive interface and the ionic conductivity of the adhesive layer were obtained. The results are shown in Table 3.
TABLE 3
Regarding the formation of an adhesive layer with an adhesive composition and attaching it to an aluminum plate formed of A5052P H32 in JIS H4000:2014, and the capacitance per unit area of the interface of the adhesive layer and the aluminum plate after leaving for 7 days at 22℃in an environment of 15% RH was 0.9. Mu.F/cm 2 The adhesive compositions of examples 3-1 to 3-5 in which the ionic conductivity of the adhesive layer was 10. Mu.S/m or more showed a large decrease in adhesion due to voltage application.
While the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications and substitutions may be made to the above embodiments without departing from the scope of the present invention.
The present application is based on japanese patent application filed on 3 months of 2018, 9 (japanese patent application publication No. 2018-164545), japanese patent application filed on 3 months of 2019, 3 (japanese patent application publication No. 2019-065065), and japanese patent application filed on 29 months of 2019, 8 (japanese patent application publication No. 2019-157325), the contents of which are incorporated herein by reference.
Description of the reference numerals
X1, X2 and X3 adhesive sheet
1. Electrically releasable adhesive layer
2. Adhesive layer
3. Substrate material
4. Conductive layer
5. Base material for electrification
100 aluminum evaporation PET film
200. Adhesive layer
300. Aluminum plate
400. Sample of joined body
Claims (11)
1. An adhesive composition comprising a polymer and an ionic liquid, wherein the polymer is an acrylic polymer having an alkoxy group, the acrylic polymer comprising a monomer unit derived from an alkyl (meth) acrylate (formula (1) below),
CH 2 =C(R a )COOR b (1)
R in formula (1) a Is a hydrogen atom or methyl group, R b Is an alkyl group having 1 to 8 carbon atoms,
an adhesive layer is formed from a composition formed from a component other than the ionic liquid among the components contained in the adhesive composition, and the relative dielectric constant of the adhesive layer at a frequency of 100Hz is 5 or more after the adhesive layer is left for 3 days in an environment of 22 ℃ and 20%RH.
2. An adhesive composition comprising a polymer and an ionic liquid, wherein the polymer is an acrylic polymer having an alkoxy group, the acrylic polymer comprising a monomer unit derived from an alkyl (meth) acrylate (formula (1) below),
CH 2 =C(R a )COOR b (1)
r in formula (1) a Is a hydrogen atom or methyl group, R b Is an alkyl group having 1 to 8 carbon atoms,
the adhesive composition was used to form an adhesive layer and attach it to an aluminum plate formed of A5052P H32 in JIS H4000:2014, and the capacitance per unit area of the interface of the adhesive layer and the aluminum plate after being left for 7 days at 22℃in an environment of 15% RH was 0.9. Mu.F/cm 2 The ionic conductivity of the adhesive layer is 10. Mu.S/m or more.
3. The adhesive composition according to claim 2, wherein the adhesive composition is used to form an adhesive layer and attach it to an aluminum plate formed of a5052P H in JIS H4000:2014, and the capacitance per unit area of the interface of the adhesive layer and the aluminum plate after being left for 7 days in an environment of 22 ℃ and 15% rh is 1.2 μf/cm 2 The ionic conductivity of the adhesive layer is 20. Mu.S/m or more.
4. The adhesive composition of any one of claims 1-3, further comprising an ionic solid.
5. The adhesive composition of any of claims 1-4, wherein the polymer comprises an ionic polymer.
6. The adhesive composition according to any one of claims 1 to 3, wherein the ionic liquid and the ionic solid are contained in an amount of 0.5 to 30 parts by mass and 0.5 to 10 parts by mass, respectively, with respect to 100 parts by mass of the polymer.
7. The adhesive composition according to any one of claims 1 to 3, wherein the ionic liquid is contained in an amount of 0.5 to 30 parts by mass, and the ionic polymer is contained in an amount of 0.05 to 2 parts by mass, based on 100 parts by mass of the polymer.
8. An adhesive composition comprising 100 parts by mass of an acrylic polymer and 0.5 to 30 parts by mass of an ionic liquid, wherein the acrylic polymer comprises monomer units derived from a polar group-containing monomer which is an alkoxy group-containing monomer,
the acrylic polymer comprises monomer units derived from an alkyl (meth) acrylate (formula (1) below),
CH 2 =C(R a )COOR b (1)
R in formula (1) a Is a hydrogen atom or methyl group, R b Is an alkyl group having 1 to 8 carbon atoms,
the proportion of the polar group-containing monomer to the total monomer components constituting the acrylic polymer is 0.1 to 35 mass%.
9. The adhesive composition according to any one of claims 1 to 8 for use in electrical stripping.
10. An adhesive sheet comprising an adhesive layer formed from the adhesive composition according to any one of claims 1 to 9.
11. A joined body is provided with:
an adherend having a metal adherend surface; and
the adhesive sheet according to claim 10,
the adhesive layer of the adhesive sheet is bonded to the metal adherend surface.
Applications Claiming Priority (8)
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JP2018-164545 | 2018-09-03 | ||
JP2018164545 | 2018-09-03 | ||
JP2019-065065 | 2019-03-28 | ||
JP2019065065 | 2019-03-28 | ||
JP2019-157325 | 2019-08-29 | ||
JP2019157325A JP2020164778A (en) | 2018-09-03 | 2019-08-29 | Adhesive composition, pressure sensitive adhesive sheet and conjugate |
PCT/JP2019/034143 WO2020050169A1 (en) | 2018-09-03 | 2019-08-30 | Adhesive composition, adhesive sheet and bonded body |
CN201980057389.4A CN112639045B (en) | 2018-09-03 | 2019-08-30 | Adhesive composition, adhesive sheet, and joined body |
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CN201980057389.4A Division CN112639045B (en) | 2018-09-03 | 2019-08-30 | Adhesive composition, adhesive sheet, and joined body |
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JP2021161389A (en) * | 2020-03-30 | 2021-10-11 | 日東電工株式会社 | Adhesive composition, adhesive sheet and conjugate |
US20230174830A1 (en) * | 2020-03-30 | 2023-06-08 | Nitto Denko Corporation | Electrically peelable adhesive compositions for high temperature exposure |
WO2022163593A1 (en) * | 2021-01-29 | 2022-08-04 | 日東電工株式会社 | Adhesive composition for electical peeling, adhesive sheet and bonded body |
KR20240024217A (en) * | 2022-02-10 | 2024-02-23 | 빅텍크노스 컴퍼니 엘티디. | Electrically peelable adhesive composition, electrically peelable adhesive product and use thereof |
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EP1914285A1 (en) | 2005-08-09 | 2008-04-23 | The Yokohama Rubber Co., Ltd. | Electropeeling composition, and making use of the same, adhesive and electropeeling multilayer adhesive |
WO2009041445A1 (en) * | 2007-09-25 | 2009-04-02 | Three Bond Co., Ltd. | Anaerobically curable composition |
JP4963485B2 (en) * | 2008-04-07 | 2012-06-27 | 綜研化学株式会社 | Adhesive composition for polarizing plate and method for producing the same |
JP5210078B2 (en) * | 2008-07-31 | 2013-06-12 | ビッグテクノス株式会社 | Electrically peelable pressure-sensitive adhesive composition, electrically peelable adhesive product, and method for peeling |
JP5296446B2 (en) | 2008-07-31 | 2013-09-25 | ビッグテクノス株式会社 | Electrically peelable pressure-sensitive adhesive composition, electrically peelable adhesive product, and method for peeling |
JP5425258B2 (en) * | 2012-04-16 | 2014-02-26 | 日東電工株式会社 | Adhesive composition, adhesive layer, polarizing film with adhesive layer, and image forming apparatus |
KR101314202B1 (en) * | 2013-01-08 | 2013-10-02 | 동우 화인켐 주식회사 | Adhesive composition |
JP6062270B2 (en) * | 2013-01-31 | 2017-01-18 | 日本カーバイド工業株式会社 | Adhesive composition and optical member surface protective film |
JP6097112B2 (en) | 2013-03-27 | 2017-03-15 | リンテック株式会社 | Electrically peelable adhesive sheet and method of using the electrically peelable adhesive sheet |
US11279855B2 (en) * | 2015-10-16 | 2022-03-22 | Nitto Denko Corporation | Electrically peelable adhesive composition, adhesive sheet, and joined body |
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TWI553078B (en) * | 2015-12-24 | 2016-10-11 | Nanya Plastics Corp | A polyamine acrylate adhesive and its use |
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JP6911745B2 (en) * | 2017-03-31 | 2021-07-28 | 東洋インキScホールディングス株式会社 | Conductive adhesives, adhesive connectors, and adhesive terminal members |
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