JP2021066833A - 導電性接着剤、それを用いた接着構造体及び電子部品 - Google Patents
導電性接着剤、それを用いた接着構造体及び電子部品 Download PDFInfo
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- JP2021066833A JP2021066833A JP2019194347A JP2019194347A JP2021066833A JP 2021066833 A JP2021066833 A JP 2021066833A JP 2019194347 A JP2019194347 A JP 2019194347A JP 2019194347 A JP2019194347 A JP 2019194347A JP 2021066833 A JP2021066833 A JP 2021066833A
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- Prior art keywords
- meth
- acrylate
- conductive adhesive
- conductive
- phosphate
- Prior art date
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- 239000000853 adhesive Substances 0.000 title claims abstract description 99
- 230000001070 adhesive effect Effects 0.000 title claims abstract description 99
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims abstract description 132
- 239000002245 particle Substances 0.000 claims abstract description 55
- 239000000178 monomer Substances 0.000 claims abstract description 50
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims abstract description 41
- 229940085991 phosphate ion Drugs 0.000 claims abstract description 22
- 239000003999 initiator Substances 0.000 claims abstract description 20
- 125000002467 phosphate group Chemical group [H]OP(=O)(O[H])O[*] 0.000 claims abstract description 15
- 150000001875 compounds Chemical class 0.000 claims abstract description 13
- 229910052751 metal Inorganic materials 0.000 claims description 36
- 239000002184 metal Substances 0.000 claims description 33
- 239000003795 chemical substances by application Substances 0.000 claims description 22
- 230000000415 inactivating effect Effects 0.000 claims description 19
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical group OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 18
- 229910052782 aluminium Inorganic materials 0.000 claims description 12
- 239000011162 core material Substances 0.000 claims description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 9
- 150000002736 metal compounds Chemical class 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical class [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- 239000005909 Kieselgur Substances 0.000 claims description 2
- 229910052769 Ytterbium Inorganic materials 0.000 claims description 2
- 229910021536 Zeolite Inorganic materials 0.000 claims description 2
- 229910052788 barium Inorganic materials 0.000 claims description 2
- 229910052791 calcium Inorganic materials 0.000 claims description 2
- 239000004927 clay Substances 0.000 claims description 2
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 2
- 229910052738 indium Inorganic materials 0.000 claims description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 2
- 229910052749 magnesium Inorganic materials 0.000 claims description 2
- 239000011707 mineral Substances 0.000 claims description 2
- 239000000741 silica gel Substances 0.000 claims description 2
- 229910002027 silica gel Inorganic materials 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 229910052718 tin Inorganic materials 0.000 claims description 2
- 229910052719 titanium Inorganic materials 0.000 claims description 2
- 239000010457 zeolite Substances 0.000 claims description 2
- 229910052725 zinc Inorganic materials 0.000 claims description 2
- 229910052726 zirconium Inorganic materials 0.000 claims description 2
- 229920005989 resin Polymers 0.000 abstract description 22
- 239000011347 resin Substances 0.000 abstract description 22
- 238000003860 storage Methods 0.000 abstract description 11
- 230000000937 inactivator Effects 0.000 abstract 2
- 239000000758 substrate Substances 0.000 description 53
- -1 isooctyl Chemical group 0.000 description 37
- 238000000034 method Methods 0.000 description 34
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 15
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 10
- 239000004065 semiconductor Substances 0.000 description 10
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 8
- 230000001678 irradiating effect Effects 0.000 description 8
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 7
- 239000003822 epoxy resin Substances 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 7
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 7
- 229920000647 polyepoxide Polymers 0.000 description 7
- 229920005862 polyol Polymers 0.000 description 7
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 6
- 150000001252 acrylic acid derivatives Chemical class 0.000 description 6
- 125000002947 alkylene group Chemical group 0.000 description 6
- 125000004432 carbon atom Chemical group C* 0.000 description 6
- 150000003077 polyols Chemical class 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 5
- 229910052737 gold Inorganic materials 0.000 description 5
- 239000010931 gold Substances 0.000 description 5
- XXMIOPMDWAUFGU-UHFFFAOYSA-N hexane-1,6-diol Chemical compound OCCCCCCO XXMIOPMDWAUFGU-UHFFFAOYSA-N 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- TXBCBTDQIULDIA-UHFFFAOYSA-N 2-[[3-hydroxy-2,2-bis(hydroxymethyl)propoxy]methyl]-2-(hydroxymethyl)propane-1,3-diol Chemical class OCC(CO)(CO)COCC(CO)(CO)CO TXBCBTDQIULDIA-UHFFFAOYSA-N 0.000 description 4
- 239000000654 additive Substances 0.000 description 4
- 125000001931 aliphatic group Chemical group 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- ZFSLODLOARCGLH-UHFFFAOYSA-N isocyanuric acid Chemical compound OC1=NC(O)=NC(O)=N1 ZFSLODLOARCGLH-UHFFFAOYSA-N 0.000 description 4
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 4
- 229910052753 mercury Inorganic materials 0.000 description 4
- SLCVBVWXLSEKPL-UHFFFAOYSA-N neopentyl glycol Chemical compound OCC(C)(C)CO SLCVBVWXLSEKPL-UHFFFAOYSA-N 0.000 description 4
- 229910052763 palladium Inorganic materials 0.000 description 4
- 150000007519 polyprotic acids Polymers 0.000 description 4
- 150000005846 sugar alcohols Polymers 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 3
- 239000005977 Ethylene Substances 0.000 description 3
- 229910019142 PO4 Inorganic materials 0.000 description 3
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 125000003647 acryloyl group Chemical group O=C([*])C([H])=C([H])[H] 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 125000003277 amino group Chemical group 0.000 description 3
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 238000001723 curing Methods 0.000 description 3
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 125000004433 nitrogen atom Chemical group N* 0.000 description 3
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 3
- 239000010452 phosphate Substances 0.000 description 3
- 235000021317 phosphate Nutrition 0.000 description 3
- 229920000728 polyester Polymers 0.000 description 3
- 229920005906 polyester polyol Polymers 0.000 description 3
- 239000005056 polyisocyanate Substances 0.000 description 3
- 229920001228 polyisocyanate Polymers 0.000 description 3
- 229920001451 polypropylene glycol Polymers 0.000 description 3
- 229910052709 silver Inorganic materials 0.000 description 3
- 239000004332 silver Substances 0.000 description 3
- 229910000679 solder Inorganic materials 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- SZCWBURCISJFEZ-UHFFFAOYSA-N (3-hydroxy-2,2-dimethylpropyl) 3-hydroxy-2,2-dimethylpropanoate Chemical compound OCC(C)(C)COC(=O)C(C)(C)CO SZCWBURCISJFEZ-UHFFFAOYSA-N 0.000 description 2
- 239000012956 1-hydroxycyclohexylphenyl-ketone Substances 0.000 description 2
- 229910002012 Aerosil® Inorganic materials 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 2
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 2
- BAPJBEWLBFYGME-UHFFFAOYSA-N Methyl acrylate Chemical compound COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 description 2
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 2
- 125000004183 alkoxy alkyl group Chemical group 0.000 description 2
- 125000000217 alkyl group Chemical group 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 2
- 125000003118 aryl group Chemical group 0.000 description 2
- 230000001588 bifunctional effect Effects 0.000 description 2
- MQDJYUACMFCOFT-UHFFFAOYSA-N bis[2-(1-hydroxycyclohexyl)phenyl]methanone Chemical compound C=1C=CC=C(C(=O)C=2C(=CC=CC=2)C2(O)CCCCC2)C=1C1(O)CCCCC1 MQDJYUACMFCOFT-UHFFFAOYSA-N 0.000 description 2
- PXKLMJQFEQBVLD-UHFFFAOYSA-N bisphenol F Chemical compound C1=CC(O)=CC=C1CC1=CC=C(O)C=C1 PXKLMJQFEQBVLD-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 125000003438 dodecyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 2
- 238000009713 electroplating Methods 0.000 description 2
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 2
- 125000000623 heterocyclic group Chemical group 0.000 description 2
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 229910001507 metal halide Inorganic materials 0.000 description 2
- 150000005309 metal halides Chemical class 0.000 description 2
- 239000002923 metal particle Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- BDJRBEYXGGNYIS-UHFFFAOYSA-N nonanedioic acid Chemical compound OC(=O)CCCCCCCC(O)=O BDJRBEYXGGNYIS-UHFFFAOYSA-N 0.000 description 2
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 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
- 239000004417 polycarbonate Substances 0.000 description 2
- 229920000515 polycarbonate Polymers 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 2
- 229910052724 xenon Inorganic materials 0.000 description 2
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 2
- 239000008096 xylene Substances 0.000 description 2
- PUPZLCDOIYMWBV-UHFFFAOYSA-N (+/-)-1,3-Butanediol Chemical compound CC(O)CCO PUPZLCDOIYMWBV-UHFFFAOYSA-N 0.000 description 1
- CKGKXGQVRVAKEA-UHFFFAOYSA-N (2-methylphenyl)-phenylmethanone Chemical compound CC1=CC=CC=C1C(=O)C1=CC=CC=C1 CKGKXGQVRVAKEA-UHFFFAOYSA-N 0.000 description 1
- MUTGBJKUEZFXGO-OLQVQODUSA-N (3as,7ar)-3a,4,5,6,7,7a-hexahydro-2-benzofuran-1,3-dione Chemical compound C1CCC[C@@H]2C(=O)OC(=O)[C@@H]21 MUTGBJKUEZFXGO-OLQVQODUSA-N 0.000 description 1
- KMOUUZVZFBCRAM-OLQVQODUSA-N (3as,7ar)-3a,4,7,7a-tetrahydro-2-benzofuran-1,3-dione Chemical compound C1C=CC[C@@H]2C(=O)OC(=O)[C@@H]21 KMOUUZVZFBCRAM-OLQVQODUSA-N 0.000 description 1
- SDXHBDVTZNMBEW-UHFFFAOYSA-N 1-ethoxy-2-(2-hydroxyethoxy)ethanol Chemical compound CCOC(O)COCCO SDXHBDVTZNMBEW-UHFFFAOYSA-N 0.000 description 1
- CSCSROFYRUZJJH-UHFFFAOYSA-N 1-methoxyethane-1,2-diol Chemical compound COC(O)CO CSCSROFYRUZJJH-UHFFFAOYSA-N 0.000 description 1
- XLPJNCYCZORXHG-UHFFFAOYSA-N 1-morpholin-4-ylprop-2-en-1-one Chemical compound C=CC(=O)N1CCOCC1 XLPJNCYCZORXHG-UHFFFAOYSA-N 0.000 description 1
- PIZHFBODNLEQBL-UHFFFAOYSA-N 2,2-diethoxy-1-phenylethanone Chemical compound CCOC(OCC)C(=O)C1=CC=CC=C1 PIZHFBODNLEQBL-UHFFFAOYSA-N 0.000 description 1
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- PUGOMSLRUSTQGV-UHFFFAOYSA-N 2,3-di(prop-2-enoyloxy)propyl prop-2-enoate Chemical class C=CC(=O)OCC(OC(=O)C=C)COC(=O)C=C PUGOMSLRUSTQGV-UHFFFAOYSA-N 0.000 description 1
- BTJPUDCSZVCXFQ-UHFFFAOYSA-N 2,4-diethylthioxanthen-9-one Chemical compound C1=CC=C2C(=O)C3=CC(CC)=CC(CC)=C3SC2=C1 BTJPUDCSZVCXFQ-UHFFFAOYSA-N 0.000 description 1
- OVJHMJJVXOJMBB-UHFFFAOYSA-N 2-(1,3-dioxo-3a,4,5,6,7,7a-hexahydroisoindol-2-yl)ethyl prop-2-enoate Chemical compound C1CCCC2C(=O)N(CCOC(=O)C=C)C(=O)C21 OVJHMJJVXOJMBB-UHFFFAOYSA-N 0.000 description 1
- VJZBTBIZXCDAMV-UHFFFAOYSA-N 2-(1,3-dioxo-5,6,7,7a-tetrahydro-4h-isoindol-3a-yl)ethyl prop-2-enoate Chemical compound C1CCCC2C(=O)NC(=O)C21CCOC(=O)C=C VJZBTBIZXCDAMV-UHFFFAOYSA-N 0.000 description 1
- NXBXJOWBDCQIHF-UHFFFAOYSA-N 2-[hydroxy-[2-(2-methylprop-2-enoyloxy)ethoxy]phosphoryl]oxyethyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OCCOP(O)(=O)OCCOC(=O)C(C)=C NXBXJOWBDCQIHF-UHFFFAOYSA-N 0.000 description 1
- FGTYTUFKXYPTML-UHFFFAOYSA-N 2-benzoylbenzoic acid Chemical compound OC(=O)C1=CC=CC=C1C(=O)C1=CC=CC=C1 FGTYTUFKXYPTML-UHFFFAOYSA-N 0.000 description 1
- UHFFVFAKEGKNAQ-UHFFFAOYSA-N 2-benzyl-2-(dimethylamino)-1-(4-morpholin-4-ylphenyl)butan-1-one Chemical compound C=1C=C(N2CCOCC2)C=CC=1C(=O)C(CC)(N(C)C)CC1=CC=CC=C1 UHFFVFAKEGKNAQ-UHFFFAOYSA-N 0.000 description 1
- 125000000954 2-hydroxyethyl group Chemical group [H]C([*])([H])C([H])([H])O[H] 0.000 description 1
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- LPNSCOVIJFIXTJ-UHFFFAOYSA-N 2-methylidenebutanamide Chemical compound CCC(=C)C(N)=O LPNSCOVIJFIXTJ-UHFFFAOYSA-N 0.000 description 1
- POYODSZSSBWJPD-UHFFFAOYSA-N 2-methylprop-2-enoyloxy 2-methylprop-2-eneperoxoate Chemical compound CC(=C)C(=O)OOOC(=O)C(C)=C POYODSZSSBWJPD-UHFFFAOYSA-N 0.000 description 1
- MWDGNKGKLOBESZ-UHFFFAOYSA-N 2-oxooctanal Chemical compound CCCCCCC(=O)C=O MWDGNKGKLOBESZ-UHFFFAOYSA-N 0.000 description 1
- SEILKFZTLVMHRR-UHFFFAOYSA-N 2-phosphonooxyethyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OCCOP(O)(O)=O SEILKFZTLVMHRR-UHFFFAOYSA-N 0.000 description 1
- UVRCNEIYXSRHNT-UHFFFAOYSA-N 3-ethylpent-2-enamide Chemical compound CCC(CC)=CC(N)=O UVRCNEIYXSRHNT-UHFFFAOYSA-N 0.000 description 1
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- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 description 1
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- KDYFGRWQOYBRFD-UHFFFAOYSA-N Succinic acid Natural products OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 description 1
- ZJCCRDAZUWHFQH-UHFFFAOYSA-N Trimethylolpropane Chemical compound CCC(CO)(CO)CO ZJCCRDAZUWHFQH-UHFFFAOYSA-N 0.000 description 1
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- ORLQHILJRHBSAY-UHFFFAOYSA-N [1-(hydroxymethyl)cyclohexyl]methanol Chemical compound OCC1(CO)CCCCC1 ORLQHILJRHBSAY-UHFFFAOYSA-N 0.000 description 1
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Abstract
Description
本発明の導電性接着剤は、(メタ)アクリレート(A)、光重合開始剤(B)、リン酸基含有モノマー(C)、リン酸イオン不活性化剤(D)及び導電性粒子(E)を含有することを特徴とするものである。換言すれば、(メタ)アクリレート(A)、光重合開始剤(B)及びリン酸基含有モノマー(C)からなる紫外線硬化型樹脂(以下、単に「紫外線硬化型樹脂」という場合がある。)と、リン酸イオン不活性化剤(D)と、導電性粒子(E)とを含有する導電性接着剤である。
本発明の導電性接着剤に係る(メタ)アクリレート(A)は、紫外可視光が照射されることにより硬化し、上記紫外線硬化型樹脂の主剤となるものであり、(メタ)アクロイル基を少なくとも1つ有する化合物である。(メタ)アクリレート(A)はモノマーであってもオリゴマーであってもよいが、モノマーであることが好ましい。
なお、本発明において、「(メタ)アクリレート」とは、アクリレート及びメタクリレート、すなわちアクリル酸エステル及びメタクリル酸エステルを包含する概念である。
また、これら(メタ)アクリレートのアルキレンオキサイド変性物も使用することもできる。
本発明の導電性接着剤に係る光重合開始剤(B)は、上記紫外線硬化型樹脂を効率的に光硬化させる成分である。本発明で用いることができる光重合開始剤(B)は特に制限されないが、例えば、2−ベンジル−2−ジメチルアミノ−1−(4−モルホリノフェニル)−1−ブタノン、2−(ジメチルアミノ)−2−[(4−メチルフェニル)メチル]−[4−(4−モルホリニル)フェニル]−1−ブタノン、2−メチル−1−[4−(メチルチオ)フェニル]−2−モルホリノプロパン−1−オン、ベンゾフェノン、メチルベンゾフェノン、o−ベンゾイル安息香酸、ベンゾイルエチルエーテル、2,2−ジエトキシアセトフェノン、2,4−ジエチルチオキサントン、ジフェニル−(2,4,6−トリメチルベンゾイル)ホスフィンオキシド、エチル−(2,4,6−トリメチルベンゾイル)フェニルホスフィネート、4,4’−ビス(ジエチルアミノ)ベンゾフェノン、1−ヒドロキシシクロヘキシル−フェニルケトン、2,2−ジメトキシ−1,2−ジフェニルエタン−1−オン、1−[4−(2−ヒドロキシエトキシ)−フェニル]−2−ヒドロキシ−2−メチル−1−プロパン−1−オン、2,2−ジメトキシ−2−フェニルアセトフェノール及び1−[4−(2−ヒドロキシエトキシ)−フェニル]−2−ヒドロキシ−2−メチル−1−プロパン−1−オン等のアルキルフェノン系光重合開始剤、ビス(2,4,6−トリメチルベンゾイル)−フェニルホスフィンオキサイド及びジフェニル(2,4,6−トリメチルベンゾイル)ホスフィンオキシド等のアシルフォスフィンオキサイド系光重合開始剤、1,2−オクタンジオン,1−[4−(フェニルチオ)−2−(O−ベンゾイルオキシム)]等のオキシムエステル系光重合開始剤、並びにスルホニウム塩系光重合開始剤等が挙げられる。これらの光重合開始剤は、1種のみを使用してもよく、2種以上を任意の割合で混合して使用することもできる。
本発明の導電性接着剤に係るリン酸基含有モノマー(C)は、上記紫外線硬化型樹脂の密着性向上に寄与する成分である。本発明で用いることができるリン酸基含有モノマー(C)は、特に制限されず、重合性の官能基を有し、かつリン酸基を有するモノマーであればよい。
本発明の導電性接着剤に係るリン酸イオン不活性化剤(D)は、上記紫外線硬化型樹脂と導電性粒子とを含む導電性接着剤に貯蔵安定性を付与する成分であり、具体的には、リン酸基含有モノマー(C)に由来する遊離リン酸イオンを不活性化して、他の成分との反応を抑制することにより貯蔵安定性を付与する成分である。本発明で用いることができるリン酸イオン不活性化剤(D)は、遊離リン酸イオンを不活性化できるものであればよく、リン酸イオンを吸着して不活性化する化合物及びリン酸イオンと反応して不活性化する化合物等が挙げられる。
本発明の導電性接着剤に係る導電性粒子(E)は、導電性を付与する成分である。本発明においては、導電性粒子(E)として、導電性接着剤、異方性導電膜、異方導電性接着剤に使用されている公知のものを用いることができる。導電性粒子(E)としては、例えば、金、銀、銅、ニッケル、パラジウム、ハンダ等の金属粒子、カーボン粒子のようなそれ自体で導電性を有するもの、芯材粒子の表面を導電性金属で被覆処理した導電性粒子等が挙げられる。
フィルムや紙のような基板1の一方の面である表面1a上に、電極であるアルミアンテナ2が形成されている。表面1aには、少なくともアルミアンテナ2の全体を含む範囲に、本発明の導電性接着剤3が塗布され紫外可視光により硬化されている。基板1には、表面1a上に、金属電極5を有する電子部品、すなわち半導体であるICチップ4が、金属電極5がアルミアンテナ2の上方に位置するように載置されている。ICチップ4は、本発明の導電性接着剤3(導電性粒子6を含む)によって基板1の表面1a側に接着されている。なお、アルミアンテナ2と、金属電極5すなわちICチップ4とは、導電性粒子6を介して通電するように構成されている。
図2の電子部品を実装する装置30は、基板1を載置すると共に基板1を加熱する加熱部材であるヒートテーブル31と、紫外可視光を照射する照射部材32と、照射部材32をヒートテーブル31に向かってあるいはヒートテーブル31から離れるように移動させる駆動装置33と、制御部34とを備えている。制御部34は、ヒートテーブル31と、照射部材32と、駆動装置33とのそれぞれに電気的に接続されている。
ICチップ4の平面形状は任意の形状でよいが、ここでは、図4に示されるような楕円形状を有するものとして説明する。なお、基板1に実装されたICチップ4は、ICカードやICタグなどのRFID関連製品に用いられる。また、基板1に実装された発光ダイオード14は、発光電子部品に用いられる。
(メタ)アクリレート(A)は、下記の市販のものを使用した。
光重合開始剤(B)は、下記の市販のものを使用した。
リン酸基含有モノマー(C)は、下記の市販のものを使用した。
リン酸イオン不活性化剤(D)は、下記の市販のものを使用した。
導電性粒子は、球状の樹脂粒子の表面に金−ニッケルの導電層を有する平均粒子径が3.0μmである金めっき粒子(日本化学工業製)を用いた。
表5に示す組成で、(メタ)アクリレート(A)、光重合開始剤(B)、リン酸基含有モノマー(C)、リン酸イオン不活性化剤(D)及び添加剤としてアエロジルRX200(チキソ性付与剤:日本アエロジル製)を、自転・公転式真空ミキサーを用いて25℃で1時間混合し、実施例1〜8及び比較例1〜2の導電性接着剤を調製した。
導電性接着剤5gを容器に入れ、その容器を30℃に保ち、1日後及び3日後の状態を目視で観察し、その状態を評価した。結果を表5に併記した。
なお、表中の貯蔵安定性の評価結果は下記のことを示す。
×:1日後には硬化している。
〇:1日後は状態に変化なし、3日後にはゲルが観察される。
◎:1日後及び3日後も状態に変化なし。
PETフィルム上にアルミニウム配線が形成された基板(サイズ:縦2.5cm、横8cm)上のアルミ配線の全体を含む範囲に、実施例及び比較例で調製した導電性接着剤を、硬化後の厚さが50μmとなるようにディスペンス法で塗布し、金パンプを有するICを載置した。温度25℃、1N/mm2の加圧下で、紫外可視光(波長365nm、照度5,000mW/cm2)を2秒間照射して導電性接着剤を硬化させることにより、評価用の接着構造体を作製した。なお、用いた導電性接着剤は調製して2時間以内のものを使用した。
作製した接着構造体について、導電性接着剤のダイシェア強度を測定した。ダイシェア強度は、基板からICチップを剥離する際の強度(N/mm2)を、デジタルフォースゲージを用いて測定した。結果を表5に併記した。なお、表中のダイシェア強度結果は下記のことを示す。
○:20N/mm2以上
×:20N/mm2未満
1a (基板の)表面
1b (基板の)底面
2 アルミアンテナ(電極)
3 導電性接着剤
4 ICチップ(半導体、電子部品)
5 金属電極
6 導電性粒子
14 発光ダイオード(電子部品)
20 外接矩形
21 (外接矩形の)長辺
22 (外接矩形の)短辺
23 非照射領域
30 装置
31 ヒートテーブル(加熱部材)
32 照射部材
33 駆動装置
34 制御部
35 接触面
36 板部材
37 光源
Claims (12)
- (メタ)アクリレート(A)、光重合開始剤(B)、リン酸基含有モノマー(C)、リン酸イオン不活性化剤(D)及び導電性粒子(E)を含有する導電性接着剤。
- リン酸基含有モノマー(C)が、リン酸基含有(メタ)アクリレートである請求項1に記載の導電性接着剤。
- リン酸基含有モノマー(C)の含有量が、(メタ)アクリレート(A)100重量部に対して1〜50質量部である請求項1に記載の導電性接着剤。
- リン酸イオン不活性化剤(D)が、リン酸イオンを吸着して不活性化する化合物及び/又はリン酸イオンと反応して不活性化する化合物からなる請求項1に記載の導電性接着剤。
- リン酸イオンを吸着して不活性化する化合物が、活性アルミナ、シリカゲル、ゼオライト、粘度鉱物、活性炭、活性白土、珪藻土及びセライトからなる群より選ばれる請求項4に記載の導電性接着剤。
- リン酸イオンと反応して不活性化する化合物が、Zn、Al、Ba、Ca、Mg、Zr、Ti、Sn、Si、In、Ce、Ag及びYbから選ばれる金属元素を1種又は2種以上含有する無機金属化合物である請求項4に記載の導電性接着剤。
- リン酸イオン不活性化剤(D)の配合量が、リン酸基含有モノマー(C)100質量部に対して0.5〜30質量部である請求項1に記載の導電性接着剤。
- 導電性粒子(E)が、芯材粒子の表面を導電性金属で被覆した導電性粒子である請求項1に記載の導電性接着剤。
- 異方導電性接着剤である請求項8に記載の導電性接着剤。
- 請求項1〜9のいずれか1項に記載の導電性接着剤を介して被接着部材同士が接着されている接着構造体。
- 請求項1〜9のいずれか1項に記載の導電性接着剤を用いた電子部品。
- 電子部品が、ICカード、ICタグ及び発光電子部品から選ばれる請求項11に記載の電子部品。
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