CN107614640A - 粘着片 - Google Patents
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- Publication number
- CN107614640A CN107614640A CN201580080272.XA CN201580080272A CN107614640A CN 107614640 A CN107614640 A CN 107614640A CN 201580080272 A CN201580080272 A CN 201580080272A CN 107614640 A CN107614640 A CN 107614640A
- Authority
- CN
- China
- Prior art keywords
- adhesive sheet
- inorganic filler
- base material
- methyl
- resin bed
- 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.)
- Granted
Links
- 239000000853 adhesive Substances 0.000 title claims abstract description 145
- 230000001070 adhesive effect Effects 0.000 title claims abstract description 145
- 239000011256 inorganic filler Substances 0.000 claims abstract description 141
- 229910003475 inorganic filler Inorganic materials 0.000 claims abstract description 141
- 229920005989 resin Polymers 0.000 claims abstract description 117
- 239000011347 resin Substances 0.000 claims abstract description 117
- 239000000463 material Substances 0.000 claims abstract description 107
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 92
- 230000015556 catabolic process Effects 0.000 claims abstract description 23
- 238000009413 insulation Methods 0.000 claims abstract description 23
- 239000000203 mixture Substances 0.000 claims description 46
- 238000007711 solidification Methods 0.000 claims description 6
- 230000008023 solidification Effects 0.000 claims description 6
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 4
- 239000003063 flame retardant Substances 0.000 claims description 4
- 238000002485 combustion reaction Methods 0.000 abstract description 9
- 238000000354 decomposition reaction Methods 0.000 abstract description 9
- -1 polyethylene terephthalate Polymers 0.000 description 58
- BAPJBEWLBFYGME-UHFFFAOYSA-N Methyl acrylate Chemical compound COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 description 47
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 39
- CERQOIWHTDAKMF-UHFFFAOYSA-N alpha-methacrylic acid Natural products CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 38
- 229920001296 polysiloxane Polymers 0.000 description 33
- 238000000576 coating method Methods 0.000 description 31
- 239000011248 coating agent Substances 0.000 description 28
- 239000003431 cross linking reagent Substances 0.000 description 28
- 238000012360 testing method Methods 0.000 description 28
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 27
- 229920000058 polyacrylate Polymers 0.000 description 27
- 239000000178 monomer Substances 0.000 description 23
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 22
- 238000004519 manufacturing process Methods 0.000 description 20
- 150000002148 esters Chemical class 0.000 description 19
- 239000000377 silicon dioxide Substances 0.000 description 18
- 239000002253 acid Substances 0.000 description 16
- 150000001875 compounds Chemical class 0.000 description 16
- 238000000034 method Methods 0.000 description 15
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 15
- 229920000642 polymer Polymers 0.000 description 15
- 239000012530 fluid Substances 0.000 description 14
- 125000000524 functional group Chemical group 0.000 description 14
- 238000010438 heat treatment Methods 0.000 description 12
- 239000007787 solid Substances 0.000 description 11
- 239000004411 aluminium Substances 0.000 description 10
- 229910052782 aluminium Inorganic materials 0.000 description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 10
- 239000004020 conductor Substances 0.000 description 10
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- 235000012239 silicon dioxide Nutrition 0.000 description 10
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 9
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 9
- 239000011159 matrix material Substances 0.000 description 9
- 238000012545 processing Methods 0.000 description 9
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 8
- 238000005227 gel permeation chromatography Methods 0.000 description 8
- 238000002156 mixing Methods 0.000 description 8
- 238000003860 storage Methods 0.000 description 8
- 239000003054 catalyst Substances 0.000 description 7
- 238000011156 evaluation Methods 0.000 description 7
- 239000012528 membrane Substances 0.000 description 7
- 229910052697 platinum Inorganic materials 0.000 description 7
- 229920001721 polyimide Polymers 0.000 description 7
- 229910052710 silicon Inorganic materials 0.000 description 7
- 239000000243 solution Substances 0.000 description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 6
- 125000003342 alkenyl group Chemical group 0.000 description 6
- 125000000217 alkyl group Chemical group 0.000 description 6
- 239000003963 antioxidant agent Substances 0.000 description 6
- 230000003078 antioxidant effect Effects 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 6
- 238000003763 carbonization Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- 229920001195 polyisoprene Polymers 0.000 description 6
- 239000010703 silicon Substances 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 239000000758 substrate Substances 0.000 description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 5
- ZJCCRDAZUWHFQH-UHFFFAOYSA-N Trimethylolpropane Chemical compound CCC(CO)(CO)CO ZJCCRDAZUWHFQH-UHFFFAOYSA-N 0.000 description 5
- IAQRGUVFOMOMEM-UHFFFAOYSA-N but-2-ene Chemical group CC=CC IAQRGUVFOMOMEM-UHFFFAOYSA-N 0.000 description 5
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 5
- 238000004132 cross linking Methods 0.000 description 5
- 238000001035 drying Methods 0.000 description 5
- 239000001257 hydrogen Substances 0.000 description 5
- 229910052739 hydrogen Inorganic materials 0.000 description 5
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 5
- 239000012948 isocyanate Substances 0.000 description 5
- 239000011859 microparticle Substances 0.000 description 5
- 125000005372 silanol group Chemical group 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
- 239000004593 Epoxy Substances 0.000 description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 4
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical compound CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 description 4
- 239000004793 Polystyrene Substances 0.000 description 4
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 4
- 239000000654 additive Substances 0.000 description 4
- 125000005250 alkyl acrylate group Chemical group 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- XBDQKXXYIPTUBI-UHFFFAOYSA-N dimethylselenoniopropionate Natural products CCC(O)=O XBDQKXXYIPTUBI-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000010894 electron beam technology Methods 0.000 description 4
- 230000009477 glass transition Effects 0.000 description 4
- 239000012212 insulator Substances 0.000 description 4
- 150000002513 isocyanates Chemical class 0.000 description 4
- 230000035800 maturation Effects 0.000 description 4
- 239000005011 phenolic resin Substances 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 4
- 229920002554 vinyl polymer Polymers 0.000 description 4
- 239000004215 Carbon black (E152) Substances 0.000 description 3
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 3
- 239000004696 Poly ether ether ketone Substances 0.000 description 3
- 239000004962 Polyamide-imide Substances 0.000 description 3
- 239000007983 Tris buffer Substances 0.000 description 3
- SSOONFBDIYMPEU-UHFFFAOYSA-N [3-hydroxy-2-[[3-hydroxy-2,2-bis(hydroxymethyl)propoxy]methyl]-2-(hydroxymethyl)propyl] prop-2-enoate Chemical compound OCC(CO)(CO)COCC(CO)(CO)COC(=O)C=C SSOONFBDIYMPEU-UHFFFAOYSA-N 0.000 description 3
- 150000001335 aliphatic alkanes Chemical class 0.000 description 3
- 125000001931 aliphatic group Chemical group 0.000 description 3
- 150000001336 alkenes Chemical class 0.000 description 3
- 238000003556 assay Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- ZNAAXKXXDQLJIX-UHFFFAOYSA-N bis(2-cyclohexyl-3-hydroxyphenyl)methanone Chemical compound C1CCCCC1C=1C(O)=CC=CC=1C(=O)C1=CC=CC(O)=C1C1CCCCC1 ZNAAXKXXDQLJIX-UHFFFAOYSA-N 0.000 description 3
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 229930195733 hydrocarbon Natural products 0.000 description 3
- 150000002430 hydrocarbons Chemical class 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- SLCVBVWXLSEKPL-UHFFFAOYSA-N neopentyl glycol Chemical compound OCC(C)(C)CO SLCVBVWXLSEKPL-UHFFFAOYSA-N 0.000 description 3
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 3
- 239000007800 oxidant agent Substances 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 3
- 229920002312 polyamide-imide Polymers 0.000 description 3
- 229920000728 polyester Polymers 0.000 description 3
- 229920002530 polyetherether ketone Polymers 0.000 description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 description 3
- 239000005020 polyethylene terephthalate Substances 0.000 description 3
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- 238000006467 substitution reaction Methods 0.000 description 3
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 2
- 229920002126 Acrylic acid copolymer Polymers 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
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- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- OAKJQQAXSVQMHS-UHFFFAOYSA-N Hydrazine Chemical compound NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- OFBQJSOFQDEBGM-UHFFFAOYSA-N Pentane Chemical compound CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
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- QOSMNYMQXIVWKY-UHFFFAOYSA-N Propyl levulinate Chemical compound CCCOC(=O)CCC(C)=O QOSMNYMQXIVWKY-UHFFFAOYSA-N 0.000 description 2
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-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
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
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- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
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- XLJMAIOERFSOGZ-UHFFFAOYSA-M cyanate Chemical compound [O-]C#N XLJMAIOERFSOGZ-UHFFFAOYSA-M 0.000 description 2
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- 125000005843 halogen group Chemical group 0.000 description 2
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 description 2
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- IUVKMZGDUIUOCP-BTNSXGMBSA-N quinbolone Chemical compound O([C@H]1CC[C@H]2[C@H]3[C@@H]([C@]4(C=CC(=O)C=C4CC3)C)CC[C@@]21C)C1=CCCC1 IUVKMZGDUIUOCP-BTNSXGMBSA-N 0.000 description 2
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- MSAHTMIQULFMRG-UHFFFAOYSA-N 1,2-diphenyl-2-propan-2-yloxyethanone Chemical compound C=1C=CC=CC=1C(OC(C)C)C(=O)C1=CC=CC=C1 MSAHTMIQULFMRG-UHFFFAOYSA-N 0.000 description 1
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- 150000005208 1,4-dihydroxybenzenes Chemical group 0.000 description 1
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- IRHICGGRMJVIOW-UHFFFAOYSA-N 2-(2,4,6-trioxo-1,3,5-triazinan-1-yl)ethyl prop-2-enoate Chemical class C=CC(=O)OCCN1C(=O)NC(=O)NC1=O IRHICGGRMJVIOW-UHFFFAOYSA-N 0.000 description 1
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- DXPPIEDUBFUSEZ-UHFFFAOYSA-N 6-methylheptyl prop-2-enoate Chemical group CC(C)CCCCCOC(=O)C=C DXPPIEDUBFUSEZ-UHFFFAOYSA-N 0.000 description 1
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- 101100006370 Arabidopsis thaliana CHX2 gene Proteins 0.000 description 1
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- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 1
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 description 1
- 239000004322 Butylated hydroxytoluene Substances 0.000 description 1
- 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 1
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Classifications
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- 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
- C09J7/38—Pressure-sensitive adhesives [PSA]
- C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- C09J7/385—Acrylic polymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
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Abstract
本发明提供一种粘着片1A、1B、1C,其具备:绝缘性的基材11;设置在基材11的至少一面侧的含有绝缘性的无机填料的含无机填料的树脂层12;以及,作为至少一面的最外层而设置的粘着剂层13。根据所述粘着片1A、1B、1C,即使因高温导致基材11发生了碳化或燃烧分解,或者即使在基材11中发生了绝缘击穿,也能够确保绝缘性。
Description
技术领域
本发明涉及一种具有绝缘性的粘着片,优选涉及一种使用于电子部件中的粘着片。
背景技术
对于使用于诸如印刷基板或电池的电子部件的粘着片,要求其不带来如损伤该电子部件的电特性的影响。例如,对于贴附于或者接触电子部件内电流流动的导电体的粘着片,要求其具有绝缘性。
此外,电子部件在使用时有时会发热。若因该发热而导致粘着片变性,则有可能对电子部件造成不良影响。因此,对于使用于电子部件中的粘着片,要求其具有耐热性。
作为这样的粘着片的例子,专利文献1及2中公开了使用于电池中的粘着片。这些粘着片由基材和设置在该基材的一面上的粘着剂层构成。
现有技术文献
专利文献
专利文献1:日本专利第5639733号
专利文献2:日本特开2011-138632号公报
发明内容
本发明要解决的技术问题
构成粘着片的基材通常由具有绝缘性的材料形成,但是这样的基材若暴露于高温下,则会发生碳化或燃烧分解(以下有时称为“碳化等”),存在基材整体变成导电体的情况。该情况下,粘着片显示导电性,在使用该粘着片的电子部件中,因粘着片而导致发生短路或热失控,存在发生重大事故的可能性。
此外,对粘着片的一部分施加高电压时,存在基材中的该部分发生碳化等从而形成导体路的情况(绝缘击穿)。在该情况下,也会与上述同样地发生短路或热失控,存在发生重大事故的可能性。
以往的粘着胶带无法充分地防止诸如上述那样的因高温导致的碳化等及绝缘击穿的问题。
本发明是鉴于上述实际情况而完成的,其目的在于提供一种即使因高温导致基材发生了碳化或燃烧分解,或者即使在基材中发生了绝缘击穿,也能确保绝缘性的粘着片。
解决技术问题的技术手段
为了达到上述目的,第一,本发明提供一种粘着片,其特征在于,具备:绝缘性的基材;设置在所述基材的至少一面侧的含有绝缘性的无机填料的含无机填料的树脂层;以及,作为至少一面的最外层而设置的粘着剂层(发明1)。另外,此处的最外层不包括剥离片。
关于上述发明(发明1)涉及的粘着片,由于即使在暴露于高温下致使基材变成导电体、或者即使部分地施加高电压从而在基材上形成导体路的情况下,也能够维持基于含无机填料的树脂层中所包含的无机填料的绝缘性,由此,能够确保粘着片自身的绝缘性。
上述发明(发明1)中,优选:所述基材具有满足UL94标准的阻燃等级V-0的阻燃性(发明2)。
上述发明(发明1,2)中,优选:所述含无机填料的树脂层设置在所述基材的一面侧,所述粘着剂层设置在所述含无机填料的树脂层的与所述基材相反的面侧(发明3)。
上述发明(发明1~3)中,优选:所述含无机填料的树脂层中的所述无机填料的含量为0.5~50g/m2(发明4)。
上述发明(发明1~4)中,优选:所述含无机填料的树脂层由使含有活性能量射线固化性成分及所述无机填料的组合物固化而成的材料形成(发明5)。
上述发明(发明1~5)中,优选:所述基材发生绝缘击穿的最小的电压为1kV以上(发明6)。
上述发明(发明1~6)中,优选:将所述粘着片使用于电子部件中(发明7)。
发明效果
根据本发明涉及的粘着片,即使因高温导致基材发生了碳化或燃烧分解,或者即使在基材中发生了绝缘击穿,也能够确保绝缘性。
附图说明
图1是本发明的实施方式涉及的粘着片的剖面图。
图2是本发明的其他实施方式涉及的粘着片的剖面图。
图3本发明的另一其他实施方式涉及的粘着片的剖面图。
具体实施方式
以下,对本发明的实施方式进行说明。
[粘着片]
如图1所示,本实施方式涉及的粘着片1A由基材11、设置在基材11的一面侧的含无机填料的树脂层12、设置在含无机填料的树脂层12的与基材11相反侧的粘着剂层13、以及设置在粘着剂层13的与含无机填料的树脂层12相反侧的剥离片14构成。
此外,如图2所示,本实施方式涉及的粘着片1B由基材11、设置在基材11的一面侧的含无机填料的树脂层12、设置在基材11的与含无机填料的树脂层12相反侧的粘着剂层13、以及设置在粘着剂层13的与含无机填料的树脂层12相反侧的剥离片14构成。
此外,如图3所示,本实施方式涉及的粘着片1C由基材11、分别设置在基材11的两面侧的两个含无机填料的树脂层12、设置在一方的含无机填料的树脂层12的与基材11相反侧的粘着剂层13、以及设置在粘着剂层13的与含无机填料的树脂层12相反侧的剥离片14构成。
关于本实施方式涉及的粘着片1A、1B、1C,通过设置有具有绝缘性的基材11,从而在通常的环境下、即在基材11不发生碳化或燃烧分解的温度及不发生绝缘击穿的电负荷的环境下,能够发挥良好的绝缘性。进一步,即使在粘着片1A、1B、1C被暴露于高温下、基材11或含无机填料的树脂层12中的基体(matrix)(有机成分)发生了碳化等的情况下,含无机填料的树脂层12中的无机填料也作为绝缘性的膜而残存,因此能够确保粘着片1A、1B、1C自身的绝缘性。此外,即使在对粘着片1A、1B、1C部分地施加高电压,对于粘着片1A、1B、1C电流沿厚度方向流动、基材11中的该电流的路径变成导体路、且进而含无机填料的树脂层12中的基体沿该电流的路径发生了碳化等的情况下,无机填料在该路径中也作为绝缘体而存在,因此能够确保粘着片1A、1B、1C自身的绝缘性。由此,在使用粘着片1A、1B、1C的电子部件中,可抑制短路及热失控的发生。进一步,由于粘着片1A及1C在更靠近作为贴附对象的电子部件的位置上确保有含无机填料的树脂层,从而更难以形成因绝缘击穿导致的导体路的迂回路径,故而优选。
1.基材
本实施方式涉及的粘着片1A、1B、1C中,基材11具有绝缘性。通过使基材11具有绝缘性,从而在通常的环境下的使用中,粘着片1A、1B、1C能够发挥绝缘性。
此外,优选基材11发生绝缘击穿的最小的电压高,例如该电压优选为1kV以上,特别优选为2kV以上,进一步优选为5kV以上。通过使该电压为1kV以上,难以发生基材11的绝缘击穿,粘着片1A、1B、1C的可靠性得以提高。
进一步,优选:基材11具有满足UL94标准的阻燃等级V-0的阻燃性。通过使基材11具有这样的阻燃性,即使在使用有粘着片1A、1B、1C的电子部件发生了发热的情况下,也可抑制基材11的变性及变形。此外,即使在电子部件发生了不良情况、过度发热的情况下,也可抑制基材11的起火及燃烧。
基材11的材料只要是能发挥绝缘性的材料,则没有特别限定,可从发生绝缘击穿的最小的电压、介质损耗角正切、阻燃性、耐热性、耐溶剂性等角度出发而适当地选择。特别是,作为基材11优选使用树脂膜。作为树脂膜,例如可列举出聚对苯二甲酸乙二醇酯、聚对苯二甲酸丁二醇酯、聚萘二甲酸乙二醇酯等聚酯膜;聚乙烯膜、聚丙烯膜等聚烯烃膜;玻璃纸(cellophane)、二乙酰纤维素膜、三乙酰纤维素膜、乙酰纤维素丁酸酯膜、聚氯乙烯膜、聚偏二氯乙烯膜、聚乙烯醇膜、乙烯-乙酸乙烯酯共聚物膜、聚苯乙烯膜、聚碳酸酯膜、聚甲基戊烯膜、聚砜膜、聚醚醚酮膜、聚醚砜膜、聚醚酰亚胺膜、氟树脂膜、聚酰胺膜、聚酰亚胺膜、聚酰胺酰亚胺膜、丙烯酸树脂膜、聚氨酯树脂膜、降冰片烯类聚合物膜、环状烯烃类聚合物膜、环状共轭二烯类聚合物膜、乙烯基脂环式烃聚合物膜等树脂膜或它们的层叠膜。这些膜中,从耐热性高、发生绝缘击穿的最小的电压高、介质损耗角正切小的角度出发,优选使用聚酰亚胺膜、聚醚酰亚胺膜或聚醚醚酮膜,特别优选使用显示高耐热性的聚酰亚胺膜。另外,本说明书中,“聚合物”也包含“共聚物”的概念。
基材11的厚度优选为2μm以上,特别优选为6μm以上,进一步优选为10μm以上。此外,基材11的厚度优选为200μm以下,特别优选为100μm以下,进一步优选为40μm以下。通过使基材11的厚度为2μm以上,可对基材11赋予适度的刚性,即使在在基材11上形成含无机填料的树脂层12时发生了固化收缩的情况下,也可有效地抑制翘曲的发生。此外,通过使基材11的厚度为200μm以下,粘着片1A、1B、1C具有适度的柔软性,即使在将粘着片1A、1B、1C贴附于存在段差的面上时,也能良好地追随该段差。
2.含无机填料的树脂层
(1)含无机填料的树脂层的组成
含无机填料的树脂层12含有绝缘性的无机填料。通过使含无机填料的树脂层12含有绝缘性的无机填料,即使在因高温导致基材11或含无机填料的树脂层12中的基体发生了碳化或燃烧分解的情况下,含无机填料的树脂层12中的无机填料也作为绝缘性的膜而残存。进一步,即使在基材11发生了绝缘击穿、进而含无机填料的树脂层12中的基体沿绝缘击穿的路径发生了碳化等的情况下,无机填料在该路径中也作为绝缘体而存在。由此,可确保粘着片1A、1B、1C自身的绝缘性。
含无机填料的树脂层12优选由含有有机成分和无机填料的组合物(以下有时称为“含无机填料的树脂层用组合物”)形成。特别是,从耐热性的角度出发,优选含无机填料的树脂层为硬涂层。该硬涂层优选由使含有活性能量射线固化性成分和无机填料的组合物固化而成的材料形成。另外,图3所示的粘着片1C中,两个含无机填料的树脂层12各自的组成可以相同或者也可以不同。
(1-1)活性能量射线固化性成分
作为活性能量射线固化性成分,只要通过活性能量射线的照射而进行固化,并发挥所需的硬度,则没有特别限定。
作为具体的活性能量射线固化性成分,可列举出多官能(甲基)丙烯酸酯类单体、(甲基)丙烯酸酯类预聚物、活性能量射线固化性聚合物等,但其中,优选为多官能(甲基)丙烯酸酯类单体和/或(甲基)丙烯酸酯类预聚物。多官能(甲基)丙烯酸酯类单体及(甲基)丙烯酸酯类预聚物可以分别单独使用,也可以同时使用两者。另外,本说明书中,(甲基)丙烯酸酯是指丙烯酸酯及甲基丙烯酸酯这两者。其他类似术语也相同。
作为多官能(甲基)丙烯酸酯类单体,例如可列举出1,4-丁二醇二(甲基)丙烯酸酯、1,6-己二醇二(甲基)丙烯酸酯、新戊二醇二(甲基)丙烯酸酯、聚乙二醇二(甲基)丙烯酸酯、羟基新戊酸新戊二醇二(甲基)丙烯酸酯、二环戊基二(甲基)丙烯酸酯、己内酯改性二环戊烯基二(甲基)丙烯酸酯、环氧乙烷改性磷酸二(甲基)丙烯酸酯、烯丙基化环己基二(甲基)丙烯酸酯、异氰脲酸酯二(甲基)丙烯酸酯、三羟甲基丙烷三(甲基)丙烯酸酯、二季戊四醇三(甲基)丙烯酸酯、丙酸改性二季戊四醇三(甲基)丙烯酸酯、季戊四醇三(甲基)丙烯酸酯、环氧丙烷改性三羟甲基丙烷三(甲基)丙烯酸酯、三(丙烯酰氧乙基)异氰脲酸酯、丙酸改性二季戊四醇五(甲基)丙烯酸酯、二季戊四醇六(甲基)丙烯酸酯、己内酯改性二季戊四醇六(甲基)丙烯酸酯等多官能(甲基)丙烯酸酯。它们可单独使用一种,也可以组合使用两种以上。
另一方面,作为(甲基)丙烯酸酯类预聚物,例如可列举出聚酯丙烯酸酯类、环氧丙烯酸酯类、氨基甲酸酯丙烯酸酯类、多元醇丙烯酸酯类等预聚物。预聚物可以单独使用一种,也可以组合使用两种以上。
作为活性能量射线固化性聚合物,例如可以使用侧链上具有活性能量射线固化性基团的(甲基)丙烯酸酯聚合物(以下称为“活性能量射线固化性(甲基)丙烯酸酯聚合物(A)”)。活性能量射线固化性(甲基)丙烯酸酯聚合物(A)优选为使具有含官能团的单体单元的丙烯酸类聚合物(a1)与具有与该官能团键合的取代基的含不饱和基团的化合物(a2)反应而得到的物质。作为上述不饱和基团,例如优选列举出(甲基)丙烯酰基等。
本实施方式的含无机填料的树脂层12为硬涂层时,关于构成该硬涂层的活性能量射线固化性成分,固化后的玻璃化转变点优选为130℃以上,更优选为150℃以上,特别优选为观测不到玻璃化转变点的活性能量射线固化性成分。通过使活性能量射线固化性成分的玻璃化转变点如上所述,硬涂层的耐热性变得优异,包含设置有这样的硬涂层的粘着片1A、1B、1C的电子部件的性能及安全性也变得优异。
另外,本实施方式的硬涂层中使用两种以上的活性能量射线固化性成分时,优选这些活性能量射线固化性成分为彼此相容性优异的活性能量射线固化性成分。
(1-2)其他有机成分
作为除活性能量射线固化性成分以外的可使用的有机成分,可列举出热固性树脂、热塑性树脂等。通过掺和该成分,能够使含无机填料的树脂层12与基材11的密着性更高。作为该有机成分的具体例,可列举出聚酰胺酰亚胺树脂、聚醚酰亚胺树脂、聚酰亚胺树脂、聚芳酯树脂、聚醚醚酮树脂、聚砜树脂、三聚氰胺树脂、酚树脂等。其中,优选耐热性优异的聚酰胺酰亚胺树脂。
(1-3)无机填料
含无机填料的树脂层12中的无机填料的含量优选为0.5~50g/m2,特别优选为0.5~10g/m2,进一步优选为0.5~2g/m2。通过使无机填料的含量为0.5g/m2以上,即使在因高温导致基材11或含无机填料的树脂层12中的基体发生了碳化或燃烧分解的情况下,含无机填料的树脂层12中的无机填料也作为绝缘性的膜而良好地残存。进一步,即使在基材11发生了绝缘击穿、进而含无机填料的树脂层12中的基体沿绝缘击穿的路径而发生了碳化等的情况下,无机填料在该路径中也作为绝缘体而存在。由此,能够有效地确保粘着片1A、1B、1C自身的绝缘性。此外,通过使无机填料的含量为50g/m2以下,可回避制造成本变得过高,进一步易于形成使用了含无机填料的树脂层用组合物的层。含无机填料的树脂层12中的无机填料的含量,可通过调节含无机填料的树脂层用组合物中的无机填料的添加量或含无机填料的树脂层12的厚度而进行适当地调节。
使用含无机填料的树脂层用组合物而形成含无机填料的树脂层12时,含无机填料的树脂层用组合物中的无机填料的含量优选为1~99质量%,特别优选为10~90质量%,进一步优选为45~75质量%。
无机填料只要为具有绝缘性的无机填料,则没有特别限制。作为无机填料,例如可列举出二氧化硅、氧化铝、勃姆石、滑石、碳酸钙、氧化钛、氧化铁(III)、碳化硅、氮化硼、氧化锆等粉末;将它们球形化而成的珠、单晶纤维及玻璃纤维等,它们可以单独使用或混合使用两种以上。这些无机填料中,优选二氧化硅、氧化铝、勃姆石、氧化钛、氧化锆等,从绝缘性的角度出发,优选二氧化硅及氧化铝,特别优选二氧化硅。
此外,优选无机填料经表面改性。作为优选的经表面改性的无机填料,可以例示出反应性二氧化硅。
本说明书中,“反应性二氧化硅”是指由具有活性能量射线固化性不饱和基团的有机化合物而被表面改性的二氧化硅微粒。上述由具有活性能量射线固化性不饱和基团的有机化合物而被表面改性的二氧化硅微粒(反应性二氧化硅),例如,通常能够通过下述方式而得到:使平均粒径为0.5~500nm左右的、优选平均粒径为1~200nm的二氧化硅微粒表面的硅烷醇基与具有可与该硅烷醇基反应的官能团(例如,异氰酸酯基、环氧基、羧基等)的含活性能量射线固化性不饱和基团的有机化合物反应。另外,作为上述活性能量射线固化性不饱和基团,可优选列举出(甲基)丙烯酰基或乙烯基。
作为具有可与硅烷醇基反应的官能团的含活性能量射线固化性不饱和基团的有机化合物,例如优选使用通式(I)所表示的化合物等。
[化学式1]
式中,R1为氢原子或甲基,R2为卤素原子、[化学式2]所表示的基团。
[化学式2]
-OCH2CH2OH、-OH或-O(CH2)3-Si(OCH3)3
作为这样的化合物,例如可使用(甲基)丙烯酸、(甲基)丙烯酰氯、(甲基)丙烯酰氧基乙基异氰酸酯、(甲基)丙烯酸缩水甘油酯、(甲基)丙烯酸-2,3-亚氨基丙酯、(甲基)丙烯酸-2-羟基乙酯、丙烯酰氧基丙基三甲氧基硅烷等(甲基)丙烯酸衍生物。这些(甲基)丙烯酸衍生物可以单独使用一种,也可以组合使用两种以上。
作为含有这样的反应性二氧化硅与上述的多官能(甲基)丙烯酸酯类单体和/或(甲基)丙烯酸酯类预聚物的有机无机复合材料(有机硅溶胶),例如可以使用商品名称“OPSTAR Z7530”、“OPSTAR Z7524”、“OPSTAR TU4086”、“OPSTAR Z7537”(以上,JSR Corporation制造)等。
作为优选的无机填料的其他例子,可列举出氧化铝陶瓷纳米颗粒、二氧化硅表面的硅烷醇基保持露出状态的二氧化硅微粒以胶体状态悬浮于分散介质中的硅溶胶、利用硅烷偶联剂等对二氧化硅表面的硅烷醇基进行了表面处理的有机硅溶胶等。
本实施方式中所使用的无机填料的平均粒径优选为1~1000nm,特别优选为10~500nm,进一步优选为20~200nm。通过使无机填料的平均粒径为1nm以上,从而使含无机填料的树脂层用组合物固化而成的含无机填料的树脂层12变得具有更稳定的绝缘性。此外,通过使无机填料的平均粒径为1000nm以下,含无机填料的树脂层用组合物中的无机填料的分散性变得优异,在基材11上形成含无机填料的树脂层12时,能够有效地防止在含无机填料的树脂层12的与基材11相反侧的面上产生凹凸。进一步,通过在该面上形成粘着剂层13,能够在粘着剂层13的与含无机填料的树脂层12相反侧的面上获得非常高的平滑性。由此,粘着剂层13能够对被粘物发挥优异的密着性。另外,无机填料的平均粒径为通过ζ-电位测定法而测定的值。
(1-4)其他成分
用于形成本实施方式的含无机填料的树脂层12的组合物,除了含有上述的成分以外,也可以含有各种添加剂。作为各种添加剂,例如可列举出光聚合引发剂、抗氧化剂、抗静电剂、硅烷偶联剂、抗老化剂、热聚合抑制剂、着色剂、表面活性剂、储存稳定剂、增塑剂、润滑剂、消泡剂、有机类填充材料等。
将含无机填料的树脂层12设为硬涂层时,该硬涂层优选一同使用活性能量射线固化性成分与光聚合引发剂。作为光聚合引发剂,只要起到作为所使用的活性能量射线固化性成分的光聚合引发剂的作用,则没有特别限定,例如可列举出酰基氧化膦类化合物、苯偶姻化合物、苯乙酮化合物、二茂钛化合物、噻吨酮化合物、过氧化物化合物等。具体而言,可例示出1-羟基环己基苯基酮、2-羟基-2-甲基-1-苯基-丙烷-1-酮、2,2-二甲氧基-1,2-二苯基乙烷-1-酮、苯偶姻、苯偶姻甲醚、苯偶姻乙醚、苯偶姻异丙醚、苄基二苯硫(benzyldiphenyl sulfide)、一硫化四甲基秋兰姆、偶氮二异丁腈、联苄基、联乙酰、β-氯蒽醌等。
通常相对于100质量份的活性能量射线固化性成分,上述光聚合引发剂的含量优选为0.1~20质量份,特别优选为1~15质量份。
(2)作为含无机填料的树脂层的硬涂层的物性
本实施方式涉及的粘着片1A、1B、1C中,将含无机填料的树脂层12设为硬涂层时,在已形成于基材11上的状态下的该硬涂层的按照JIS K5600-5-4而测定的铅笔硬度优选为HB以上,特别优选为H以上。通过使硬涂层具有这样的铅笔硬度,能够发挥优异的耐热性。另外,硬涂层的铅笔硬度的上限值虽然没有特别限制,但从可获得对段差的优异的追随性的角度出发,优选为9H以下,特别优选为6H以下,进一步优选为3H以下。另外,图3所示的粘着片1C中,两个硬涂层各自的铅笔硬度可以相同或者也可以不同。另外,硬涂层的铅笔硬度如后述的试验例所示。
(3)含无机填料的树脂层的厚度
含无机填料的树脂层12的厚度优选为0.1μm以上,特别优选为0.5μm以上,进一步优选为1μm以上。此外,含无机填料的树脂层12的厚度优选为10μm以下,特别优选为7μm以下,进一步优选为4μm以下。通过使含无机填料的树脂层12的厚度为0.1μm以上,即使在因高温导致基材11发生了碳化或燃烧分解,或者即使基材11发生了绝缘击穿的情况下,也能有效地发挥基于无机填料的绝缘性。此外,通过使含无机填料的树脂层12的厚度为10μm以下,粘着片1A、1B、1C具有适度的柔软性,即使将粘着片1A、1B、1C贴附于存在段差的面上时,粘着片1A、1B、1C也能良好地追随该段差。另外,图3所示的粘着片1C中,两个含无机填料的树脂层12各自的厚度可以相同或者也可以不同。
3.粘着剂层
本实施方式涉及的粘着片1A、1B、1C中,粘着剂层13作为至少一面的最外层(不包括剥离片)而被设置。另外,图1~3各自所示的粘着片1A、1B、1C虽然具有一层粘着剂层13,但也可以进一步再设置一层粘着剂层13。例如,图1所示的粘着片1A中,可在基材11的与含无机填料的树脂层12相反侧的面上追加粘着剂层13。此外,图2所示的粘着片1B中,可在含无机填料的树脂层12的与基材11相反侧的面上追加粘着剂层13。进一步,图3所示的粘着片1C中,可在图中上侧的含无机填料的树脂层12的与基材11相反侧的面上追加粘着剂层13。
(1)粘着剂层的组成
作为构成粘着剂层13的粘着剂没有特别限定,可以从阻燃性、耐热性、绝缘性等的角度出发而适当地选择。特别是作为构成粘着剂层13的粘着剂,优选丙烯酸类粘着剂、硅酮类粘着剂、橡胶类粘着剂及氨基甲酸酯类粘着剂。其中,从与含无机填料的树脂层12或电极等的密着性、后述的粘着剂层13的120℃时的储能模量及粘着力的微小调节的容易度等角度出发,特别优选丙烯酸类粘着剂。
(1-1)丙烯酸类粘着剂
丙烯酸类粘着剂优选含有(甲基)丙烯酸酯聚合物,特别优选含有通过交联剂将该(甲基)丙烯酸酯聚合物交联而成的聚合物。
(甲基)丙烯酸酯聚合物优选含有烷基的碳原子数为1~20的(甲基)丙烯酸烷基酯作为构成该聚合物的单体。由此,所得到的粘着剂能够表现出良好的粘着性。此外,(甲基)丙烯酸酯聚合物特别优选为:烷基的碳原子数为1~20的(甲基)丙烯酸烷基酯与具有与交联剂反应的官能团的单体(含反应性官能团单体)及根据所需而使用的其他单体的共聚物。
作为烷基的碳原子数为1~20的(甲基)丙烯酸烷基酯,例如可列举出(甲基)丙烯酸甲酯、(甲基)丙烯酸乙酯、(甲基)丙烯酸丙酯、(甲基)丙烯酸正丁酯、(甲基)丙烯酸正戊酯、(甲基)丙烯酸正己酯、(甲基)丙烯酸-2-乙基己酯、(甲基)丙烯酸异辛酯、(甲基)丙烯酸正癸酯、(甲基)丙烯酸正十二烷基酯、(甲基)丙烯酸肉豆蔻酯、(甲基)丙烯酸棕榈酯、(甲基)丙烯酸硬脂基酯等。其中,从进一步提高粘着性的角度出发,优选烷基的碳原子数为1~8的(甲基)丙烯酸酯,特别优选(甲基)丙烯酸甲酯、(甲基)丙烯酸正丁酯及(甲基)丙烯酸-2-乙基己酯。另外,它们可以单独使用,也可以组合使用两种以上。
(甲基)丙烯酸酯聚合物优选含有40~99质量%、特别优选含有50~90质量%、进一步优选含有75~85质量%的烷基的碳原子数为1~20的(甲基)丙烯酸烷基酯作为构成该聚合物的单体单元。
作为上述含反应性官能团单体,优选列举出分子内具有羟基的单体(含羟基单体)、分子内具有羧基的单体(含羧基单体)、分子内具有氨基的单体(含氨基单体)等。它们可以单独使用,也可以组合使用两种以上。
作为含羟基单体,例如可列举出(甲基)丙烯酸-2-羟基乙酯、(甲基)丙烯酸-2-羟基丙酯、(甲基)丙烯酸-3-羟基丙酯、(甲基)丙烯酸-2-羟基丁酯、(甲基)丙烯酸-3-羟基丁酯、(甲基)丙烯酸-4-羟基丁酯等(甲基)丙烯酸羟基烷基酯等。其中,从所得到的(甲基)丙烯酸酯聚合物中的羟基与交联剂的反应性以及与其他单体的共聚性的点出发,优选(甲基)丙烯酸-2-羟基乙酯及(甲基)丙烯酸-4-羟基丁酯。它们可以单独使用,也可以组合使用两种以上。
作为含羧基单体,例如可列举出丙烯酸、甲基丙烯酸、巴豆酸、马来酸、衣康酸、柠康酸等烯属不饱和羧酸。其中,从所得到的(甲基)丙烯酸酯聚合物中的羧基与交联剂的反应性以及与其他单体的共聚性的点出发,优选丙烯酸。它们可以单独使用,也可以组合使用两种以上。
作为含氨基单体,例如可列举出(甲基)丙烯酸氨基乙酯、(甲基)丙烯酸正丁基氨基乙酯等。它们可以单独使用,也可以组合使用两种以上。
(甲基)丙烯酸酯聚合物优选含有0.1~40质量%、特别优选含有0.5~20质量%、进一步优选含有1.0~4.0质量%的含反应性官能团单体作为构成该聚合物的单体单元。通过使含反应性官能团单体的含量为0.1质量%以上,能够有效地提高通过经由后述的交联剂来构筑交联结构而得到的粘着剂的凝聚力。此外,通过使该含量为40质量%以下,易于获得所需的粘着性。
作为上述其他单体,例如可列举出(甲基)丙烯酸甲氧基乙酯、(甲基)丙烯酸乙氧基乙酯等(甲基)丙烯酸烷氧基烷基酯;(甲基)丙烯酸环己酯等具有脂肪族环的(甲基)丙烯酸酯;丙烯酰胺、甲基丙烯酰胺等非交联性的丙烯酰胺;(甲基)丙烯酸N,N-二甲氨基乙酯、(甲基)丙烯酸N,N-二甲氨基丙酯等的具有非交联性的叔氨基的(甲基)丙烯酸酯;乙酸乙烯酯;苯乙烯等。它们可以单独使用,也可以组合使用两种以上。
(甲基)丙烯酸酯聚合物的聚合形态可以为无规共聚物,也可以为嵌段共聚物。
(甲基)丙烯酸酯聚合物的重均分子量优选为30万~250万,特别优选为40万~190万,进一步优选为70万~160万。若(甲基)丙烯酸酯聚合物的重均分子量为30万以上,则粘着剂层13的耐久性变得优异。此外,若(甲基)丙烯酸酯聚合物的重均分子量为250万以下,则可获得良好的涂布性。另外,本说明书中的重均分子量为利用凝胶渗透色谱(GPC)法而测定的换算成标准聚苯乙烯的值。
另外,上述丙烯酸类粘着剂中,(甲基)丙烯酸酯聚合物可以单独使用一种,也可以组合使用两种以上。
作为交联剂,只要为与(甲基)丙烯酸酯聚合物所具有的反应性官能团反应的交联剂即可,例如可列举出异氰酸酯类交联剂、环氧类交联剂、胺类交联剂、三聚氰胺类交联剂、氮丙啶类交联剂、肼类交联剂、醛类交联剂、噁唑啉类交联剂、金属醇盐类交联剂、金属螯合物类交联剂、金属盐类交联剂、铵盐类交联剂等。另外,交联剂可以单独使用一种或者组合使用两种以上。
异氰酸酯类交联剂至少包含聚异氰酸酯化合物。作为聚异氰酸酯化合物,例如可列举出甲苯二异氰酸酯、二苯基甲烷二异氰酸酯、苯二亚甲基二异氰酸酯等芳香族聚异氰酸酯;六亚甲基二异氰酸酯等脂肪族聚异氰酸酯;异佛尔酮二异氰酸酯、氢化二苯基甲烷二异氰酸酯等脂环式聚异氰酸酯等;以及它们的缩二脲体、异氰脲酸酯体;进一步可列举出作为与乙二醇、丙二醇、新戊二醇、三羟甲基丙烷、蓖麻油等低分子含活性氢的化合物的反应物的加合物等。其中,从与羟基的反应性的角度出发,优选三羟甲基丙烷改性的芳香族聚异氰酸酯、特别优选三羟甲基丙烷改性甲苯二异氰酸酯及三羟甲基丙烷改性苯二亚甲基二异氰酸酯。
相对于100质量份的(甲基)丙烯酸酯聚合物,交联剂的使用量优选为0.001~10质量份,特别优选为0.01~5质量份,进一步优选为1~3质量份。
若将含有(甲基)丙烯酸酯聚合物和交联剂的粘着性组合物加热等,则交联剂与构成(甲基)丙烯酸酯聚合物的含反应性官能团单体的反应性官能团反应,其中该(甲基)丙烯酸酯聚合物包含含反应性官能团单体作为构成聚合物的单体单元。由此,通过交联剂形成将(甲基)丙烯酸酯聚合物交联而成的结构,能够使所得到的粘着剂的凝胶分率为所需的值,提高粘着剂的凝聚力,进而提高强度及耐久性。
可根据所需,向上述丙烯酸类粘着剂中添加通常所使用的各种添加剂,例如折射率调节剂、抗静电剂、增粘剂、硅烷偶联剂、抗氧化剂、紫外线吸收剂、光稳定剂、软化剂、填充剂、光固化剂、光聚合引发剂等。
(1-2)硅酮类粘着剂
硅酮类粘着剂优选含有有机聚硅氧烷(organo polysiloxane)、特别优选含有加成型有机聚硅氧烷(的固化物)。加成型有机聚硅氧烷优选为使以硅氧烷键为主骨架且具有链烯基的有机聚硅氧烷与有机氢聚硅氧烷(organo hydrogen polysiloxane)反应而得到的加成型有机聚硅氧烷。
以硅氧烷键为主骨架且具有链烯基的有机聚硅氧烷为以下的平均单元式(II)所表示的化合物,并且优选为分子中具有至少两个链烯基的化合物。
R1 aSiO(4-a)/2···(II)
式中,R1为彼此相同或不同的碳原子数为1~12、优选为1~8的非取代或者取代的一价烃基,a为1.5~2.8、优选为1.8~2.5、更优选为1.95~2.05的范围的正数。
作为上述R1所表示的键合于硅原子上的非取代或者取代的一价烃基,例如可列举出乙烯基、烯丙基、丙烯基、异丙烯基、丁烯基、己烯基、环己烯基、辛烯基等链烯基;甲基、乙基、丙基、异丙基、丁基、异丁基、叔丁基、戊基、新戊基、己基、环己基、辛基、壬基、癸基等烷基;苯基、甲苯基、二甲苯基、萘基等芳基;苄基、苯乙基、苯丙基等芳烷基;这些基团的氢原子的一部分或者全部被氟、溴、氯等卤素原子、氰基等取代而成的基团,例如氯甲基、氯丙基、溴乙基、三氟丙基、氰乙基等。作为链烯基,从固化时间的长短及生产率的点出发,优选乙烯基。
有机氢聚硅氧烷在分子中具有SiH基。通过上述有机聚硅氧烷的链烯基与有机氢聚硅氧烷的SiH基的反应,两者进行加成反应,从而得到加成型有机聚硅氧烷。
由于加成型有机聚硅氧烷在铂催化剂的存在下良好地固化,因此优选上述硅酮类粘着剂含有铂催化剂。作为铂催化剂,可例示出铂黑、四氯化铂、氯铂酸、氯铂酸与一元醇的反应物、氯铂酸与烯烃类的络合物、二乙酰乙酸铂等。
相对于100质量份的加成型有机聚硅氧烷,上述硅酮类粘着剂中的铂催化剂的含量优选为0.01~3质量份,特别优选为0.05~2质量份。通过使铂催化剂的含量在上述的范围内,能够在不妨碍涂布的情况下,使加成型有机聚硅氧烷固化,形成粘着剂层13。
为了提高粘着力,可使加成型有机聚硅氧烷含有分子中包含3官能或4官能的硅氧烷单元的有机聚硅氧烷(硅酮树脂)。
相对于100质量份的加成型有机聚硅氧烷,上述硅酮类粘着剂中的包含3官能或4官能的硅氧烷单元的有机聚硅氧烷的含量优选为0~100质量份,特别优选为5~70质量份,进一步优选为10~50质量份。
(1-3)橡胶类粘着剂
橡胶类粘着剂优选含有作为橡胶弹性成分的A-B-A型嵌段共聚物、增粘剂、及根据所需而进一步被含有的用于防止劣化的抗氧化剂。
作为A-B-A型嵌段共聚物,例如可列举出苯乙烯-异戊二烯-苯乙烯共聚物、苯乙烯-丁烯-苯乙烯共聚物、苯乙烯-乙烯-丁烯-苯乙烯共聚物、苯乙烯-烯烃-苯乙烯共聚物,聚异戊二烯、聚丁烯、聚异丁烯等。
橡胶类粘着剂中的橡胶弹性成分的含量优选为5~50质量%,特别优选为7~45质量%。通过使橡胶弹性成分的含量为5质量%以上,能够将橡胶类粘着剂的凝聚力维持得较高,通过使橡胶弹性成分的含量为50质量%以下,能够使粘着层的粘着力适度地高。
作为增粘剂,例如可列举出松香类树脂、多萜烯类树脂、苯并呋喃-茚树脂、石油类树脂、萜酚树脂、烷基酚树脂、苯乙烯类树脂、酚类树脂、二甲苯树脂等。
橡胶类粘着剂中的增粘剂的含量优选为10~70质量%,特别优选为15~60质量%。若增粘剂的含量小于10质量%,则粘着层的粘着力降低,若增粘剂的含量超过70质量%,则存在橡胶类粘着剂的凝聚力变得过低的可能性。
作为抗氧化剂,例如可列举出丁基羟基甲苯、2,6-二叔丁基-4-甲基苯酚、2,5-二叔丁基氢醌、巯基苯并咪唑、1,1-双(4-羟基苯酚)环己烷、苯基-β-萘胺等。
使用抗氧化剂时,橡胶类粘着剂中的抗氧化剂的含量优选为0.1~10质量%,特别优选为0.2~5质量%。
(2)粘着剂/粘着剂层的物性
本实施方式涉及的粘着片1A、1B、1C中,粘着剂层13的120℃时的储能模量优选为1~500kPa,特别优选为10~200kPa,进一步优选为40~100kPa。通过使该储能模量为上述范围,即使在比较高的温度的条件下,粘着剂层13也具有充分的硬度。因此,即使在对粘着片1A、1B、1C施加压力的情况下,粘着剂层13也难以变形,粘着剂层13难以从基材11及含无机填料的树脂层12中挤出。由此,可以抑制因粘着剂层13导致电子部件产生不良情况。另外,粘着剂层13的120℃时的储能模量的测定方法如后述的试验例所示。
本实施方式涉及的粘着片1A、1B、1C中,构成粘着剂层13的粘着剂的凝胶分率优选为20~100%。特别是,构成粘着剂层13的粘着剂为丙烯酸类粘着剂时,凝胶分率优选为20~98%,特别优选为50~95%,进一步优选为70~85%。通过使凝胶分率为20%以上,粘着剂的凝聚力变得充分。此外,通过使凝胶分率为98%以下,粘着片1A、1B、1C具有适度的柔软性,即使将粘着片1A、1B、1C贴附于存在段差的面上时,也能良好地追随该段差。另外,凝胶分率的测定方法如后述的试验例所示。
(3)粘着剂层的厚度
粘着剂层13的厚度优选为1μm以上,特别优选为3μm以上,进一步优选为4μm以上。此外,粘着剂层13的厚度优选为50μm以下,特别优选为15μm以下,进一步优选为9μm以下。通过使粘着剂层13的厚度为1μm以上,粘着片1A、1B、1C能够发挥充分的粘着力。此外,通过使粘着剂层13的厚度为50μm以下,从而防止粘着剂层13中的残留溶剂或气泡的混入等,变得容易调节上述的储能模量及后述的粘着力。
4.剥离片
剥离片14保护粘着剂层直至使用粘着片1A、1B、1C时,在使用粘着片1A、1B、1C时被剥离。本实施方式涉及的粘着片1A、1B、1C中,剥离片14不一定是必需的。
作为剥离片14,例如可以使用聚乙烯膜、聚丙烯膜、聚丁烯膜、聚丁二烯膜、聚甲基戊烯膜、聚氯乙烯膜、氯乙烯共聚物膜、聚对苯二甲酸乙二醇酯膜、聚萘二甲酸乙二醇酯膜、聚对苯二甲酸丁二醇酯膜、聚氨酯膜、乙烯乙酸乙烯酯膜、离聚物树脂膜、乙烯-(甲基)丙烯酸共聚物膜、乙烯-(甲基)丙烯酸酯共聚物膜、聚苯乙烯膜、聚碳酸酯膜、聚酰亚胺膜、氟树脂膜、液晶聚合物膜等。此外,也可以使用它们的交联膜。进一步也可以为它们的层叠膜。
优选对剥离片14的剥离面(与粘着剂层13接触的面)实施剥离处理。作为剥离处理中所使用的剥离剂,例如可列举出醇酸类、硅酮类、氟类、不饱和聚酯类、聚烯烃类、蜡类等剥离剂。
关于剥离片14的厚度没有特别限制,但通常为20~150μm左右。
5.粘着片的物性等
本实施方式涉及的粘着片1A、1B、1C对铝板的粘着力优选为0.1~20N/25mm,特别优选为0.5~10N/25mm,进一步优选为1~5N/25mm。此处所指的粘着力是指基本上根据JISZ0237:2009的180°剥离法而测定的粘着力,详细的测定方法如后述的试验例所示。
不包含剥离片的粘着片1A、1B、1C的厚度优选为5~250μm,特别优选为10~110μm,进一步优选为15~45μm。
[粘着片的制造方法]
本实施方式涉及的粘着片1A例如可通过下述方式进行制造:分别制作基材11与含无机填料的树脂层12的层叠体、以及粘着剂层13与剥离片14的层叠体,并以含无机填料的树脂层12与粘着剂层13接触的方式将这些层叠体贴合。
此外,本实施方式涉及的粘着片1B例如可通过下述方式进行制造:分别制作基材11与含无机填料的树脂层12的层叠体、以及粘着剂层13与剥离片14的层叠体,并以基材11与粘着剂层13接触的方式将这些层叠体贴合。
此外,本实施方式涉及的粘着片1C例如可通过下述方式进行制造:分别制作在基材11的两面上形成有含无机填料的树脂层12的层叠体、以及粘着剂层13与剥离片14的层叠体,并以含无机填料的树脂层12中的一者与粘着剂层13接触的方式将这些层叠体贴合。
另外,从提高含无机填料的树脂层12与粘着剂层13的密着性的角度出发,还优选对它们中的任意一层的进行贴合的面或者两个层的进行贴合的面进行电晕处理、等离子体处理等表面处理,然后将两层贴合。
基材11与含无机填料的树脂层12的层叠体,例如可以以下述方式进行制作。首先,对基材11的一个主表面涂布涂布剂,使其干燥,其中该涂布剂含有含无机填料的树脂层用组合物及根据所需而进一步被含有的溶剂。涂布剂的涂布通过常规方法进行即可,例如通过棒涂法、刮刀涂布法(knife coating method)、迈耶棒法、辊涂法、刮片涂布法(bladecoating method)、模具涂布法(die coating method)、凹版涂布法进行即可。干燥例如可通过于80~150℃下加热30秒~5分钟左右而进行。
然后,通过对使上述涂布剂干燥而成的层照射活性能量射线,使该层固化,形成含无机填料的树脂层12。作为活性能量射线,例如可使用电磁波或带电粒子束中具有能量子的活性能量射线,具体而言,可使用紫外线或电子束等。特别优选容易操作的紫外线。紫外线的照射可通过高压汞灯、氙灯等进行,关于紫外线的照射量,优选照度为50~1000mW/cm2左右。此外,光量优选为50~10000mJ/cm2,更优选为80~5000mJ/cm2,特别优选为200~2000mJ/cm2。另一方面,电子束的照射可通过电子束加速器等来进行,电子束的照射量优选为10~1000krad左右。
粘着剂层13与剥离片14的层叠体,例如可以以下述方式制作。
使用丙烯酸类粘着剂形成粘着剂层13时,将涂布溶液涂布于剥离片14的剥离面上,进行加热处理,从而形成涂膜,其中该涂布溶液含有上述的丙烯酸类粘着剂及根据所需而被含有的溶剂。所形成的涂膜在不需要熟化期时,直接成为粘着剂层13,需要熟化期时,经过熟化期后成为粘着剂层13。
也可以用使涂布溶液的稀释溶剂等挥发时的干燥处理兼作为上述加热处理。进行加热处理时,加热温度优选为50~150℃,特别优选为70~120℃。此外,加热时间优选为30秒~10分钟,特别优选为50秒~2分钟。加热处理后,也可根据所需在常温(例如,23℃、50%RH)下设置1~2周左右的熟化期。丙烯酸类粘着剂含有具有反应性官能团的(甲基)丙烯酸酯聚合物及交联剂时,通过加热处理,通过交联剂形成将(甲基)丙烯酸酯聚合物交联而成的结构。
使用硅酮类粘着剂形成粘着剂层13时,例如,可以通过下述方式形成粘着剂层13:利用甲乙酮、甲苯、乙酸乙酯、二甲苯等溶剂,将加成型有机聚硅氧烷、根据所需而含有的包含3官能或4官能的硅氧烷单元的有机聚硅氧烷、以及铂催化剂稀释至10~60质量%左右而得到涂布溶液,将该涂布溶液涂布于剥离片14的剥离面上,加热使其固化。加热温度优选为90~180℃左右,加热时间优选为1~5分钟左右。
作为本实施方式涉及的粘着片1A的其他制造方法,还可以通过在基材11上依次形成含无机填料的树脂层12及粘着剂层13,从而制造粘着片1A。此外,作为本实施方式涉及的粘着片1B的其他制造方法,还可以通过在基材11的面上分别形成含无机填料的树脂层12及粘着剂层13,从而制造粘着片1B。此外,作为本实施方式涉及的粘着片1C的其他制造方法,还可以通过在基材11的两面上形成含无机填料的树脂层12后,将粘着剂层13层叠于含无机填料的树脂层12中的一者上,从而制造粘着片1C。
[粘着片的使用方法]
本实施方式涉及的粘着片1A、1B、1C可优选使用于电子部件中。作为电子部件的例子,可列举出柔性印刷基板、电池、刚性基板、马达等。特别是,粘着片1A、1B、1C在电子部件中可以在与电流流动的导电体接触的状态下使用。该情况下,可以将粘着片1A、1B、1C的粘着剂层13侧的面贴附于该导电体上,或者,也可以使基材11侧的面与该导电体接触。进一步,也可以使粘着片1A、1B、1C的两面与导电体接触。粘着片1A、1B、1C例如在电子部件中可以以保护诸如电路的导电体为目的而使用。此外,粘着片1A、1B、1C在电子部件中可以以固定诸如电极的导电体为目的而使用。
本实施方式涉及的粘着片1A、1B、1C中,通过设置绝缘性的基材11,从而在通常时具有良好的绝缘性。进一步,由于即使在因高温导致基材11或含无机填料的树脂层12中的基体发生了碳化或燃烧分解的情况下,含无机填料的树脂层12中的无机填料也作为绝缘性的膜而残存,因此可确保粘着片1A、1B、1C自身的绝缘性。此外,即使在对粘着片1A、1B、1C部分地施加高电压,对于粘着片1A、1B、1C电流沿厚度方向流动,基材11中的该电流的路径变化为导体路,进而含无机填料的树脂层12中的基体沿该电流的路径发生了碳化等的情况下,无机填料在该路径中也作为绝缘体存在,因此可确保粘着片1A、1B、1C自身的绝缘性。由此,使用粘着片1A、1B、1C的电子部件中,可抑制短路及热失控的发生。
以上说明的实施方式是为了容易地理解本发明而记载的,并不是为了限定本发明而记载。因此,上述实施方式中公开的各要素为还包含属于本发明的技术范围的所有设计变更及等同物的宗旨。
例如,粘着片1A、1B、1C中可以省略剥离片14。此外,粘着片1A、1B、1C中,还可以在基材11与含无机填料的树脂层12之间设置其他层。
实施例
以下,利用实施例等对本发明进行进一步具体的说明,但本发明的范围并不受这些实施例等的限定。
[实施例1]
1.基材上的含无机填料的树脂层的形成
将40质量份的作为活性能量射线固化性成分的二季戊四醇六丙烯酸酯(固化后观测不到玻璃化转变点的材料)、5质量份的作为光聚合引发剂的羟基环己基苯基酮、及60质量份(换算为固体成分的值;以下相同)的作为无机填料的有机硅溶胶(NISSAN CHEMICALINDUSTRIES.LTD制造,商品名称“MEK-ST”;平均粒径为30nm)混合,利用甲乙酮进行稀释,从而制备了固体成分浓度为20质量%的含无机填料的树脂层用涂布液。
利用刮刀涂布机将上述涂布液涂布于作为基材的聚酰亚胺膜(DU PONT-TORAYCO.,LTD.制造,商品名称“KAPTON 100H”,厚度为25μm,UL94标准的阻燃等级V-0)的一面上后,使其在70℃下干燥了1分钟。接着,通过对该涂膜照射紫外线(照度为230mW/cm2,光量为510mJ/cm2),使该涂膜固化。由此,得到了在基材的一面上形成有含有2.0g/m2的无机填料的厚度为2μm的含无机填料的树脂层的第一层叠体。
2.剥离片上的粘着剂层的形成
使77质量份的丙烯酸丁酯、20质量份的丙烯酸甲酯及3质量份的丙烯酸共聚,制备了(甲基)丙烯酸酯聚合物。使用后述的凝胶渗透色谱(GPC)测定了该聚合物的分子量,其结果重均分子量(Mw)为90万。接着,将100质量份的该(甲基)丙烯酸酯聚合物、2.2质量份的作为交联剂的三羟甲基丙烷改性甲苯二异氰酸酯(TOYOCHEM CO.,LTD制造,商品名称“BHS8515”)、及0.3质量份的作为交联剂的三(乙酰丙酮)铝(Soken Chemical&EngineeringCo.,Ltd.制造,商品名称“M-5A”)混合,利用甲乙酮进行稀释,从而制备了固体成分浓度为20质量%的粘着剂层用涂布液。
利用刮刀涂布机将所得到的涂布液涂布于利用硅酮类剥离剂对聚对苯二甲酸乙二醇酯膜的单面进行了剥离处理的剥离片(Lintec Corporation.制造,商品名称“PET251130”)的剥离处理面上之后,在120℃下加热处理了1分钟。由此,得到了在剥离片的剥离处理面上层叠有厚度为5μm的由丙烯酸类粘着剂形成的粘着剂层的第二层叠体。
3.粘着片的制作
将如上所述制作的第一层叠体的含无机填料的树脂层侧的面与如上所述制作的第二层叠体的粘着剂层侧的面贴合,得到了粘着片。
[实施例2]
将45质量份的聚酰胺酰亚胺树脂(TOYOBO CO.,LTD.制造,商品名称“VYLOMAXCHX02”)、及60质量份的作为无机填料的有机硅溶胶(NISSAN CHEMICAL INDUSTRIES.LTD制造,商品名称“MEK-ST”)混合,利用甲乙酮进行稀释,从而制备了固体成分浓度为20质量%的含无机填料的树脂层用涂布液。除了使用该含无机填料的树脂层用涂布液以外,以与实施例1相同的方式制造了粘着片。另外,该粘着片的含无机填料的树脂层中的无机填料的含量为1.2g/m2。
[实施例3]
将100质量份的硅酮类粘着剂(Dow Corning Toray Silicone Co.,Ltd.制造,商品名称“SD-4584”)、及0.5质量份的催化剂(Dow Corning Toray Silicone Co.,Ltd.制造,商品名称“CAT-SRX-212”)混合,利用甲乙酮进行稀释,从而制备了固体成分浓度为20质量%的粘着剂层用涂布液。除了使用了该粘着剂层用涂布液及利用氟类剥离剂对聚对苯二甲酸乙二醇酯膜的单面进行了剥离处理的剥离片(Lintec Corporation.制造,商品名称“PET50FD”)以外,以与实施例1相同的方式制造了粘着片。
[实施例4]
将100质量份的聚异丁烯(JAPAN BUTYL Co.Ltd.制造,商品名称“Exxon Butyl268”)、5质量份的含甲基丙烯酰基的聚异戊二烯橡胶(KURARAY CO.,LTD制造,商品名称“UC-203”)、及20质量份的脂肪族类石油树脂(Zeon Corporation制造,商品名称“QuintoneA100”)混合,利用甲苯进行稀释,从而制备了固体成分浓度为20质量%的粘着剂层用涂布液。除了使用了该粘着剂层用涂布液以外,以与实施例1相同的方式制造了粘着片。
[实施例5]
将40质量份的作为活性能量射线固化性成分的二季戊四醇六丙烯酸酯、5质量份的作为光聚合引发剂的羟基环己基苯基酮、及60质量份的作为无机填料的氧化铝陶瓷纳米颗粒(BYK Japan KK.制造,商品名称“NANOBYK-3601”)混合,利用甲乙酮进行稀释,从而制备了固体成分浓度为20质量%的含无机填料的树脂层用涂布液。除了使用该含无机填料的树脂层用涂布液以外,以与实施例1相同的方式制造了粘着片。另外,该粘着片的含无机填料的树脂层中的无机填料的含量为2.2g/m2。
[实施例6]
使60质量份的丙烯酸丁酯、20质量份的丙烯酸甲酯及20质量份的丙烯酸共聚,制备了(甲基)丙烯酸酯聚合物。使用后述的凝胶渗透色谱(GPC)测定了该聚合物的分子量,其结果重均分子量(Mw)为60万。将100质量份的该(甲基)丙烯酸酯聚合物、及2.2质量份的作为交联剂的三羟甲基丙烷改性甲苯二异氰酸酯(TOYOCHEM CO.,LTD制造,商品名称“BHS8515”)混合,利用甲乙酮进行稀释,从而制备了固体成分浓度为20质量%的粘着剂层用涂布液。除了使用了该粘着剂层用涂布液以外,以与实施例1相同的方式制造了粘着片。
[实施例7]
使99质量份的丙烯酸丁酯及1质量份的丙烯酸-4-羟基丁酯共聚,制备了(甲基)丙烯酸酯聚合物。使用后述的凝胶渗透色谱(GPC)测定了该聚合物的分子量,其结果重均分子量(Mw)为150万。将100质量份的该(甲基)丙烯酸酯聚合物、及2.2质量份的作为交联剂的三羟甲基丙烷改性甲苯二异氰酸酯(TOYOCHEM CO.,LTD制造,商品名称“BHS 8515”)混合,利用甲乙酮进行稀释,从而制备了固体成分浓度为20质量%的粘着剂层用涂布液。除了使用该粘着剂层用涂布液以外,以与实施例1相同的方式制造了粘着片。
[实施例8]
将40质量份的作为活性能量射线固化性成分的二季戊四醇六丙烯酸酯、5质量份的作为光聚合引发剂的羟基环己基苯基酮、及60质量份的作为无机填料的反应性二氧化硅(为表面上具有丙烯酰基的二氧化硅微粒,表面改性前的二氧化硅微粒的平均粒径为15nm)混合,利用甲乙酮进行稀释,从而制备了固体成分浓度为20质量%的含无机填料的树脂层用涂布液。除了使用了该含无机填料的树脂层用涂布液以外,以与实施例1相同的方式制造了粘着片。另外,该粘着片的含无机填料的树脂层中的无机填料的含量为2.0g/m2。
[实施例9]
除了将第一层叠体的基材侧的面与第二层叠体的粘着剂层侧的面贴合以外,以与实施例1相同的方式制造了粘着片。
[实施例10]
除了将第一层叠体的基材侧的面与第二层叠体的粘着剂层侧的面贴合以外,以与实施例2相同的方式制造了粘着片。
[比较例1]
除了使用作为基材的聚酰亚胺膜(DU PONT-TORAY CO.,LTD.制造,商品名称“KAPTON 100H”,厚度为25μm)代替第一层叠体,并将该基材的一面与第二层叠体的粘着剂层侧的面贴合以外,以与实施例1相同的方式制造了粘着片。
[试验例1](粘着力的测定)
除了以下所示的操作以外,按照JIS Z0237:2009测定了粘着片的粘着力。
将实施例或比较例中得到的粘着片裁切成宽度为25mm、长度为250mm后,将剥离片剥离,由此得到了试验片。在23℃、50%RH的环境下,使用2kg橡胶辊将该试验片所露出的粘着剂层贴附于作为被粘物的铝板上后,在相同的环境下放置了20分钟。然后,使用万能型拉伸试验机(ORIENTEC Co.,LTD制造,Tensilon UTM-4-100)以剥离角度180°、剥离速度300mm/分钟将试验片从上述铝板上剥离,从而测定了其粘着力(N/25mm)。将该测定值作为粘着力。将结果示于表1。
[试验例2](绝缘击穿电压的测定)
对于制造实施例或比较例的粘着片时所使用的基材,按照JIS C2107的项目17“绝缘耐力”,测定了发生绝缘击穿的最小的电压(以下,有时称为“绝缘击穿电压”)。具体而言,首先,将基材裁切成300mm×300mm,得到了试验片。接着,利用耐电压测定器(KEISOKUGIKENCO.,LTD.制造,商品名称“AC耐电压试验器7220”)的电极夹持该试验片的两面。此时,使电极接触试验片的中央。接着,将电流设为10mA,以500V/s的速度使电压从0V升压至发生绝缘击穿为止。记录了此时所测定的发生绝缘击穿的电压。将结果示于表1。
[试验例3](通常时的绝缘性的评价)
将实施例或比较例中得到的粘着片的剥离膜剥离,将露出的粘着剂层贴合于铝板上,得到了试验片。然后,使用DIGITAL HiTESTER(HIOKI E.E.CORPORATION制造,商品名称“3802-50”)测定了该试验片的粘着片侧的面与铝板侧的面之间的电阻值。由此,测定了粘着片的厚度方向的电阻值。
基于所测定的粘着片的厚度方向的电阻值,按照以下的判断基准,评价了粘着片的通常时的绝缘性。将评价结果示于表1。
○…粘着片的厚度方向的电阻值为1.0×1010Ω以上
×…粘着片的厚度方向的电阻值小于1.0×1010Ω
[试验例4](加热后的绝缘性的评价)
将实施例或比较例中得到的粘着片的剥离膜剥离,将露出的粘着剂层贴合于铝板上,得到了试验片。将该试验片在800℃的氮气氛围环境下加热了1小时。然后,使用DIGITALHiTESTER(HIOKI E.E.CORP ORATION制造,商品名称“3802-50”)测定了该试验片的粘着片侧的面与铝板侧的面之间的电阻值。由此,测定了粘着片的厚度方向的电阻值。
基于所测定的粘着片的厚度方向的电阻值,按照以下的判断基准,评价了粘着片的加热后的绝缘性。将评价结果示于表1。
○…粘着片的厚度方向的电阻值为1.0×1010Ω以上
×…粘着片的厚度方向的电阻值小于1.0×1010Ω
[试验例5](绝缘击穿后的绝缘性的评价)
将实施例或比较例中得到的粘着片的剥离膜剥离,将露出的粘着剂层贴合于铝板上,得到了试验片。对该试验片施加了10kV的电压。然后,使用DIGITAL HiTESTER(HIOKIE.E.CORPORATION制造,商品名称“3802-50”)测定了该试验片的粘着片侧的面与铝板侧的面之间的电阻值。由此,测定了粘着片的厚度方向的电阻值。
基于所测定的粘着片的厚度方向的电阻值,按照以下的判断基准,评价了粘着片的绝缘击穿后的绝缘性。将评价结果示于表1。
○…粘着片的厚度方向的电阻值为1.0×1010Ω以上
×…粘着片的厚度方向的电阻值小于1.0×1010Ω
[试验例6](凝胶分率的测定)
实施例及比较例的粘着片的制造中,将第二层叠体的粘着剂层侧的面、与利用硅酮类剥离剂对聚对苯二甲酸乙二醇酯膜的单面进行了剥离处理的剥离片(LintecCorporation.制造,商品名称“PET251130”)的剥离处理面贴合,得到了由两面已被剥离片保护的粘着剂层单独构成的测定用片。
将所得到的测定用片裁切成80mm×80mm的大小,将保护粘着剂层的两面的剥离片剥下,包裹于聚酯制网(网目尺寸200)中,用精密天平秤量其质量,减去上述网单独的质量,由此算出粘着剂自身的质量。将此时的质量记为M1。接着,将包裹于上述聚酯制网中的粘着剂,在乙酸乙酯中于25℃下浸渍了24小时。然后,取出粘着剂,在温度为23℃、相对湿度为50%的环境下风干了24小时,进一步在80℃的烘箱中干燥了12小时。干燥后,用精密天平秤量其质量,减去上述网单独的质量,由此算出了粘着剂自身的质量。将此时的质量记为M2。由(M2/M1)×100的计算式算出了凝胶分率(%)。将结果示于表1。
[试验例7](储能模量的测定)
将剥离片从实施例或比较例中得到的第二层叠体上剥下,以使厚度成为0.6mm的方式层叠了多个层的粘着剂层。由所得到的粘着剂层的层叠体冲切直径为8mm的圆柱体(高度为0.6mm),将其作为了样品。
对于上述样品,按照JIS K7244-6,使用粘弹性测定装置(Physica公司制造,MCR300),通过扭剪法(ねじりせん断法)在以下的条件下测定了储能模量(MPa)。将测定结果示于表1。
测定频率:1Hz
测定温度:120℃
[试验例8](铅笔硬度的评价)
对于制造实施例及比较例的粘着片时所得到的第一层叠体中的含无机填料的树脂层,按照JIS K5600-5-4测定了铅笔硬度。测定中使用铅笔划痕硬度试验机(YASUDASEIKI SEISAKUSHO,LTD.制造,产品名称“No.553-M”),将擦划速度设为1mm/秒。将结果示于表1。
[表1]
根据表1明显可知,实施例涉及的粘着片与比较例涉及的粘着片不同,即使在暴露于高温下后以及发生了绝缘击穿后,也显示了良好的绝缘性。
工业实用性
本发明的粘着片适合作为在电子部件中使用的粘着片。
附图标记说明
1A、1B、1C…粘着片
11…基材
12…含无机填料的树脂层
13…粘着剂层
14…剥离片
Claims (7)
1.一种粘着片,其特征在于,具备:
绝缘性的基材;
设置在所述基材的至少一面侧的含有绝缘性的无机填料的含无机填料的树脂层;以及,
作为至少一面的最外层而设置的粘着剂层。
2.根据权利要求1所述的粘着片,其特征在于,所述基材具有满足UL94标准的阻燃等级V-0的阻燃性。
3.根据权利要求1或2所述的粘着片,其特征在于,所述含无机填料的树脂层设置在所述基材的一面侧,所述粘着剂层设置在所述含无机填料的树脂层的与所述基材相反的面侧。
4.根据权利要求1~3中任一项所述的粘着片,其特征在于,所述含无机填料的树脂层中的所述无机填料的含量为0.5~50g/m2。
5.根据权利要求1~4中任一项所述的粘着片,其特征在于,所述含无机填料的树脂层由使含有活性能量射线固化性成分及所述无机填料的组合物固化而成的材料形成。
6.根据权利要求1~5中任一项所述的粘着片,其特征在于,所述基材发生绝缘击穿的最小的电压为1kV以上。
7.根据权利要求1~6中任一项所述的粘着片,其特征在于,其使用于电子部件中。
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