WO2022025207A1 - 回路接続用接着剤フィルム、回路接続用接着剤組成物、並びに回路接続構造体及びその製造方法 - Google Patents
回路接続用接着剤フィルム、回路接続用接着剤組成物、並びに回路接続構造体及びその製造方法 Download PDFInfo
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- WO2022025207A1 WO2022025207A1 PCT/JP2021/028165 JP2021028165W WO2022025207A1 WO 2022025207 A1 WO2022025207 A1 WO 2022025207A1 JP 2021028165 W JP2021028165 W JP 2021028165W WO 2022025207 A1 WO2022025207 A1 WO 2022025207A1
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- Prior art keywords
- hydroxide
- oxide
- circuit connection
- component
- adhesive layer
- Prior art date
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- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 description 1
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- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 1
- 229920000106 Liquid crystal polymer Polymers 0.000 description 1
- 239000004977 Liquid-crystal polymers (LCPs) Substances 0.000 description 1
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- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 description 1
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- 239000004743 Polypropylene Substances 0.000 description 1
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- 239000004820 Pressure-sensitive adhesive Substances 0.000 description 1
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- 239000004902 Softening Agent Substances 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- ZJCCRDAZUWHFQH-UHFFFAOYSA-N Trimethylolpropane Chemical compound CCC(CO)(CO)CO ZJCCRDAZUWHFQH-UHFFFAOYSA-N 0.000 description 1
- 239000007983 Tris buffer Substances 0.000 description 1
- QYKIQEUNHZKYBP-UHFFFAOYSA-N Vinyl ether Chemical class C=COC=C QYKIQEUNHZKYBP-UHFFFAOYSA-N 0.000 description 1
- LFOXEOLGJPJZAA-UHFFFAOYSA-N [(2,6-dimethoxybenzoyl)-(2,4,4-trimethylpentyl)phosphoryl]-(2,6-dimethoxyphenyl)methanone Chemical compound COC1=CC=CC(OC)=C1C(=O)P(=O)(CC(C)CC(C)(C)C)C(=O)C1=C(OC)C=CC=C1OC LFOXEOLGJPJZAA-UHFFFAOYSA-N 0.000 description 1
- XRMBQHTWUBGQDN-UHFFFAOYSA-N [2-[2,2-bis(prop-2-enoyloxymethyl)butoxymethyl]-2-(prop-2-enoyloxymethyl)butyl] prop-2-enoate Chemical compound C=CC(=O)OCC(COC(=O)C=C)(CC)COCC(CC)(COC(=O)C=C)COC(=O)C=C XRMBQHTWUBGQDN-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000003926 acrylamides Chemical class 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
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- 125000001931 aliphatic group Chemical group 0.000 description 1
- 125000003342 alkenyl group Chemical group 0.000 description 1
- 125000004450 alkenylene group Chemical group 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 125000001797 benzyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])* 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 125000006226 butoxyethyl group Chemical group 0.000 description 1
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 238000011088 calibration curve Methods 0.000 description 1
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- 239000001913 cellulose Substances 0.000 description 1
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- 125000002704 decyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
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- 239000012954 diazonium Substances 0.000 description 1
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- 239000000945 filler Substances 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
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- 230000009969 flowable effect Effects 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 125000003187 heptyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- XXMIOPMDWAUFGU-UHFFFAOYSA-N hexane-1,6-diol Chemical compound OCCCCCCO XXMIOPMDWAUFGU-UHFFFAOYSA-N 0.000 description 1
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 1
- 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
- XMBWDFGMSWQBCA-UHFFFAOYSA-N hydrogen iodide Chemical class I XMBWDFGMSWQBCA-UHFFFAOYSA-N 0.000 description 1
- 125000002883 imidazolyl group Chemical group 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 229910052741 iridium Inorganic materials 0.000 description 1
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 description 1
- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 description 1
- 125000001972 isopentyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])C([H])([H])* 0.000 description 1
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- 239000011159 matrix material Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 229910000000 metal hydroxide Inorganic materials 0.000 description 1
- 150000004692 metal hydroxides Chemical class 0.000 description 1
- 125000000956 methoxy group Chemical group [H]C([H])([H])O* 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- YKYONYBAUNKHLG-UHFFFAOYSA-N n-Propyl acetate Natural products CCCOC(C)=O YKYONYBAUNKHLG-UHFFFAOYSA-N 0.000 description 1
- SLCVBVWXLSEKPL-UHFFFAOYSA-N neopentyl glycol Chemical compound OCC(C)(C)CO SLCVBVWXLSEKPL-UHFFFAOYSA-N 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 125000001400 nonyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- OTLDLKLSNZMTTA-UHFFFAOYSA-N octahydro-1h-4,7-methanoindene-1,5-diyldimethanol Chemical compound C1C2C3C(CO)CCC3C1C(CO)C2 OTLDLKLSNZMTTA-UHFFFAOYSA-N 0.000 description 1
- 229910052762 osmium Inorganic materials 0.000 description 1
- SYQBFIAQOQZEGI-UHFFFAOYSA-N osmium atom Chemical compound [Os] SYQBFIAQOQZEGI-UHFFFAOYSA-N 0.000 description 1
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- NFHFRUOZVGFOOS-UHFFFAOYSA-N palladium;triphenylphosphane Chemical compound [Pd].C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 NFHFRUOZVGFOOS-UHFFFAOYSA-N 0.000 description 1
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- 238000005498 polishing Methods 0.000 description 1
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
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- 239000004645 polyester resin Substances 0.000 description 1
- 239000011112 polyethylene naphthalate Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
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- 239000004800 polyvinyl chloride Substances 0.000 description 1
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- 238000003825 pressing Methods 0.000 description 1
- 229940090181 propyl acetate Drugs 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
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- 229910052703 rhodium Inorganic materials 0.000 description 1
- 239000010948 rhodium Substances 0.000 description 1
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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- KKEYFWRCBNTPAC-UHFFFAOYSA-L terephthalate(2-) Chemical compound [O-]C(=O)C1=CC=C(C([O-])=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-L 0.000 description 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- UWHCKJMYHZGTIT-UHFFFAOYSA-N tetraethylene glycol Chemical compound OCCOCCOCCOCCO UWHCKJMYHZGTIT-UHFFFAOYSA-N 0.000 description 1
- 238000012719 thermal polymerization Methods 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 125000003396 thiol group Chemical group [H]S* 0.000 description 1
- 239000013008 thixotropic agent Substances 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 239000011135 tin Substances 0.000 description 1
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 1
- BPSIOYPQMFLKFR-UHFFFAOYSA-N trimethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CO[Si](OC)(OC)CCCOCC1CO1 BPSIOYPQMFLKFR-UHFFFAOYSA-N 0.000 description 1
- 238000009281 ultraviolet germicidal irradiation Methods 0.000 description 1
- NQPDZGIKBAWPEJ-UHFFFAOYSA-N valeric acid Chemical compound CCCCC(O)=O NQPDZGIKBAWPEJ-UHFFFAOYSA-N 0.000 description 1
- 229920001567 vinyl ester resin Polymers 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Images
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
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/04—Non-macromolecular additives inorganic
-
- 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
- C09J163/00—Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins
-
- 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
- C09J171/00—Adhesives based on polyethers obtained by reactions forming an ether link in the main chain; Adhesives based on derivatives of such polymers
-
- 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
- C09J7/10—Adhesives in the form of films or foils without carriers
-
- 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
- C09J7/35—Heat-activated
-
- 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
- C09J9/00—Adhesives characterised by their physical nature or the effects produced, e.g. glue sticks
- C09J9/02—Electrically-conducting adhesives
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/50—Assembly of semiconductor devices using processes or apparatus not provided for in a single one of the subgroups H01L21/06 - H01L21/326, e.g. sealing of a cap to a base of a container
Definitions
- the present disclosure relates to an adhesive film for circuit connection, an adhesive composition for circuit connection, a circuit connection structure, and a method for manufacturing the same.
- a glass substrate is used as a substrate, and as a circuit material formed on the glass substrate, a metal such as aluminum is used for the circuit of the base layer, and ITO (Indium Tin Oxide) or the like is used for the electrode of the surface layer.
- a flexible plastic substrate such as a polyimide substrate is used as the substrate, and Ti is mainly used as a circuit material formed on the plastic substrate.
- a flexible member such as a pressure-sensitive adhesive layer and a polyethylene terephthalate (PET) substrate is usually arranged on the lower surface of the polyimide substrate for the purpose of imparting flexibility (see, for example, Patent Document 1).
- COG chip on glass
- various electronic components such as drive ICs are mounted directly on the glass substrate of a display panel from the viewpoint of fine pitch, light weight and thinness.
- COG mounting method for example, a circuit connection is made by thermocompression bonding a liquid crystal drive IC onto a glass substrate via a circuit connection adhesive film having anisotropic conductivity in which conductive particles are dispersed in an adhesive. A method of obtaining a structure is used.
- the density of bumps in IC chips is increasing, and it is required to secure high insulation between adjacent circuits.
- it is manufactured by using an adhesive film for circuit connection containing conductive particles.
- the curing system of the adhesive is a cation-epoxy curing system
- the present inventors tend to reduce the insulation resistance between adjacent circuits after the high temperature and high humidity test. It turned out by the examination of.
- the main purpose is to provide an adhesive film for connecting circuits.
- one aspect of the present disclosure is to provide an adhesive film for circuit connection containing conductive particles.
- the adhesive film contains a region A containing a cationically polymerizable compound, a thermally cationic polymerization initiator, and an ion trapping agent in the thickness direction of the film, and the cationically polymerizable compound is ring-open polymerized in the molecule.
- a cationically polymerizable compound a thermally cationic polymerization initiator, and an ion trapping agent in the thickness direction of the film
- the cationically polymerizable compound is ring-open polymerized in the molecule.
- the thermal cationic polymerization initiator contains anilinium salt
- the ion trapping agent is aluminum hydroxide, aluminum oxide, magnesium hydroxide, magnesium oxide, zirconium hydroxide, zirconium oxide.
- bismuth hydroxide bismuth oxide, calcium hydroxide, calcium oxide, tin hydroxide, tin oxide, manganese hydroxide, manganese oxide, antimony hydroxide, antimony oxide, silicon hydroxide, silicon oxide, titanium hydroxide and titanium oxide.
- bismuth oxide bismuth oxide, calcium hydroxide, calcium oxide, tin hydroxide, tin oxide, manganese hydroxide, manganese oxide, antimony hydroxide, antimony oxide, silicon hydroxide, silicon oxide, titanium hydroxide and titanium oxide.
- the circuit connection adhesive film according to the present disclosure has a cationic polymerization system region containing a compound having one or more ring-opening polymerizable cyclic ether groups in the molecule, and is located between facing electrodes and in the vicinity of conductive particles.
- the curing inhibition resistance is improved as compared with other thermal cationic polymerization initiators such as sulfonium salts. It is considered that the excellent curing characteristics could be exhibited and the conduction characteristics could be sufficiently ensured by suppressing the flow of the conductive particles between the opposing electrodes. Further, when the circuit connection adhesive film has the region A containing the above-mentioned specific ion scavenger, ions such as chloride ions that lower the insulating property are generated from the conductive particles or the like in the circuit connection structure. However, it is considered that the ions could be captured and the insulation between adjacent circuits could be sufficiently maintained.
- the conductive particles may have palladium plating.
- the circuit connection adhesive film containing such conductive particles tends to develop low resistance to a circuit having a Ti surface.
- the anilinium salt may be an anillium salt having an anion containing boron as a constituent element from the viewpoint of pot life.
- Conductive particles may be unevenly distributed on one side of the film. In this case, it becomes easy to improve the capture efficiency of conductive particles at the time of circuit connection.
- the region A may include a region P further containing a cured product of a photocurable resin component in the thickness direction of the film, and conductive particles may be dispersed in the region P.
- conductive particles may be dispersed in the region P.
- thermosetting resin component Another aspect of the present disclosure is provided on a first adhesive layer containing conductive particles, a cured product of a photocurable resin component, and a first thermosetting resin component, and on the first adhesive layer.
- an adhesive film for circuit connection including a second adhesive layer containing a second thermosetting resin component.
- the first adhesive layer and the second adhesive layer further contain an ion trapping agent, the first thermosetting resin component and the second adhesive layer.
- One or both of the thermosetting resin components contains a cationically polymerizable compound and a thermally cationic polymerization initiator, and the cationically polymerizable compound has one or more ring-opening polymerizable cyclic ether groups in the molecule.
- thermal cationic polymerization initiators include anilinium salts, ion capture agents are aluminum hydroxide, aluminum oxide, magnesium hydroxide, magnesium oxide, zirconium hydroxide, zirconium oxide, bismuth hydroxide, bismuth oxide, hydroxylated.
- circuit connection adhesive film even when circuit members are connected to each other at low pressure, sufficient continuity between opposing electrodes of the circuit connection structure can be sufficiently ensured, and insulation between adjacent circuits can be ensured. Can be sufficiently maintained. Further, since the first adhesive layer containing the conductive particles contains the cured product of the photocurable resin component, the flow of the conductive particles at the time of circuit connection can be suppressed, and the flowing conductive particles are between adjacent circuits. It is possible to prevent the insulation from being lowered by bridging the particles, and it is possible to further improve the capture efficiency of the conductive particles.
- the conductive particles may have palladium plating.
- the circuit connection adhesive film containing such conductive particles tends to develop low resistance to a circuit having a Ti surface.
- the anilinium salt may be an anilinium salt having an anion containing boron as a constituent element from the viewpoint of pot life.
- circuit connection adhesive composition containing a cationically polymerizable compound, a thermally cationic polymerization initiator, and an ion scavenger.
- the circuit connection adhesive composition contains a compound in which the cationically polymerizable compound has one or more ring-opening polymerizable cyclic ether groups in the molecule, the thermal cationic polymerization initiator contains an aluminum salt, and the ion trapping agent is.
- the region A in the circuit connection adhesive film described above, or the first adhesive layer and / or the second adhesive layer can be formed.
- the anilinium salt may be an anilinium salt having an anion containing boron as a constituent element from the viewpoint of pot life.
- the circuit connection adhesive composition can further contain conductive particles and can further contain a photocurable resin component. Such a circuit connection adhesive composition can form the region P or the first adhesive layer in the circuit connection adhesive film described above.
- the conductive particles may have palladium plating.
- Another aspect of the present disclosure is to interpose the circuit connection adhesive film between the first circuit member having the first electrode and the second circuit member having the second electrode.
- a method for manufacturing a circuit connection structure including a step of thermally crimping a first circuit member and a second circuit member to electrically connect the first electrode and the second electrode to each other.
- One of the first circuit member and the second circuit member may be an IC chip, and the other may be a plastic substrate having an electrode containing Ti.
- Another aspect of the present disclosure is disposed between a first circuit member having a first electrode, a second circuit member having a second electrode, and a first circuit member and a second circuit member.
- a circuit connection structure comprising a circuit connection portion for electrically connecting the first electrode and the second electrode to each other, wherein the circuit connection portion contains a cured product of the above-mentioned circuit connection adhesive film. do.
- One of the first circuit member and the second circuit member may be an IC chip, and the other may be a plastic substrate having an electrode containing Ti.
- circuit connection structure even when circuit members are connected to each other at low pressure, it is possible to sufficiently secure conduction between opposing electrodes of the circuit connection structure and sufficiently maintain insulation between adjacent circuits. It is possible to provide an adhesive film for circuit connection. Such a circuit connection adhesive film can be suitably used for COP mounting. Further, according to the present disclosure, it is possible to provide an adhesive composition for circuit connection suitable for forming such an adhesive film for circuit connection. Further, according to the present disclosure, it is possible to provide a circuit connection structure using the above-mentioned adhesive film for circuit connection and a method for manufacturing the same.
- FIG. 1 is a schematic cross-sectional view showing an embodiment of an adhesive film for circuit connection.
- FIG. 2 is a schematic cross-sectional view showing an embodiment of a circuit connection structure.
- FIG. 3 is a schematic cross-sectional view showing an embodiment of a method for manufacturing a circuit connection structure. 3 (a) and 3 (b) are schematic cross-sectional views showing each process.
- the (meth) acryloyl group means an acryloyl group or a methacryloyl group, as well as other similar expressions such as (meth) acrylate.
- the upper limit value or the lower limit value of the numerical range may be replaced with the value shown in the examples. Further, the lower limit value and the upper limit value of the numerical range are arbitrarily combined with the lower limit value or the upper limit value of another numerical range.
- the numerical values A and B at both ends are included in the numerical range as the lower limit value and the upper limit value, respectively.
- the description of "10 or more” means numerical values exceeding 10 and 10, and the same applies when the numerical values are different.
- the description "10 or less” means 10 and a numerical value less than 10, and the same applies when the numerical values are different.
- each component and material exemplified in the present specification may be used alone or in combination of two or more.
- the content of each component in the composition is the total amount of the plurality of substances present in the composition when a plurality of substances corresponding to each component are present in the composition, unless otherwise specified. Means.
- the circuit connection adhesive film of the present embodiment contains a region A containing conductive particles and containing a cationically polymerizable compound, a thermally cationic polymerization initiator, and an ion scavenger in the thickness direction of the film.
- the conductive particles may be unevenly distributed on one surface side of the film, and the region A includes a region P further containing a cured product of a photocurable resin component in the thickness direction of the film, and the region P includes the region P.
- Conductive particles may be dispersed.
- the region A includes a region S containing a cationically polymerizable compound, a thermally cationic polymerization initiator, and an ion scavenger in the thickness direction of the film, and does not contain a cured product of a photocurable resin component. You may.
- FIG. 1 is a schematic cross-sectional view showing an embodiment of a circuit connection adhesive film according to this embodiment.
- the circuit connection adhesive film 10 (hereinafter, may be simply referred to as “adhesive film 10”) shown in FIG. 1 includes conductive particles 4, a cured product of a photocurable resin component, and (first).
- the adhesive layer 2 of 2 is provided.
- circuit connection adhesive film of the present embodiment will be described with reference to FIG.
- the adhesive film 10 the conductive particles 4 are dispersed in the first adhesive layer 1. Therefore, the adhesive film 10 can be a circuit-connecting adhesive film (anisotropic adhesive film) having anisotropic conductivity.
- the adhesive film 10 is interposed between the first circuit member having the first electrode and the second circuit member having the second electrode, and heats the first circuit member and the second circuit member. It may be crimped and used to electrically connect the first electrode and the second electrode to each other.
- the conductive particles 4 (hereinafter, may be referred to as "(A) component”) and the photocurable resin component (hereinafter, may be referred to as “(B) component”) are cured. It contains a substance and a thermosetting resin component (hereinafter, may be referred to as "(C) component”).
- a composition layer composed of a composition containing the component (A), the component (B), and the component (C) is irradiated with light energy, and the component (B) is subjected to light energy. It can be obtained by polymerizing the contained components and curing the component (B).
- the first adhesive layer 1 contains the component (A), the cured product of the component (B), and the adhesive component 5 containing the component (C).
- the cured product of the component (B) may be a cured product obtained by completely curing the component (B), or may be a cured product obtained by curing a part of the component (B).
- the component (C) is a component that can flow when connected to a circuit, and is, for example, an uncured curable resin component.
- Component (A) Conductive particles
- the component (A) is not particularly limited as long as it is a particle having conductivity, and is a metal particle composed of a metal such as Au, Ag, Pd, Ni, Cu, or solder, or conductive carbon. It may be a conductive carbon particle composed of.
- the component (A) may be a coated conductive particle containing a nucleus containing non-conductive glass, ceramic, plastic (polystyrene, etc.) and the like, and a coating layer containing the metal or conductive carbon and covering the nucleus. good.
- the component (A) preferably comprises a core containing metal particles or plastic formed of a heat-meltable metal, and a coating layer containing metal or conductive carbon and coating the core.
- Such coated conductive particles can easily deform the cured product of the thermosetting resin component by heating or pressurizing, when the electrodes are electrically connected to each other, the electrode and the component (A) are connected to each other.
- the contact area can be increased and the conductivity between the electrodes can be further improved.
- conductive particles those having palladium plating can be used from the viewpoint of facilitating the development of low resistance to the circuit having the Ti surface.
- palladium plating can be provided on the outermost surface of the conductive particles.
- conductive particles in which the surface of the plastic core is Ni-plated and the outermost surface is substituted-plated with Pd can be used, and such conductive particles can be used from the viewpoint of preventing short circuits between the conductive particles.
- Those in which insulating fine particles are supported on the surface thereof may be used.
- a ceramic core material having a diameter of 100 nm to 200 nm is incorporated into the plating, and then Pd plating is performed to support insulating fine particles as necessary. May be good.
- the component (A) may be an insulating coated conductive particle containing the above-mentioned metal particles, conductive carbon particles, or coated conductive particles and an insulating material such as a resin and having an insulating layer covering the surface of the particles. good.
- the component (A) is an insulating coated conductive particle, even when the content of the component (A) is large, the insulating layer is provided on the surface of the particle, so that the component (A) is short-circuited due to contact with each other. The generation can be suppressed, and the insulation between adjacent electrode circuits can be improved.
- one of the above-mentioned various conductive particles may be used alone or in combination of two or more.
- the maximum particle size of the component (A) needs to be smaller than the minimum distance between the electrodes (the shortest distance between adjacent electrodes).
- the maximum particle size of the component (A) may be 1.0 ⁇ m or more, 2.0 ⁇ m or more, or 2.5 ⁇ m or more from the viewpoint of excellent dispersibility and conductivity.
- the maximum particle size of the component (A) may be 20 ⁇ m or less, 10 ⁇ m or less, or 5 ⁇ m or less from the viewpoint of excellent dispersibility and conductivity.
- the particle size of any 300 conductive particles (pcs) is measured by observation using a scanning electron microscope (SEM), and the largest value obtained is the maximum particle size of the component (A).
- SEM scanning electron microscope
- the particle size of the component (A) is the diameter of a circle circumscribing the conductive particles in the SEM image.
- the average particle size of the component (A) may be 1.0 ⁇ m or more, 2.0 ⁇ m or more, or 2.5 ⁇ m or more from the viewpoint of excellent dispersibility and conductivity.
- the average particle size of the component (A) may be 20 ⁇ m or less, 10 ⁇ m or less, or 5 ⁇ m or less from the viewpoint of excellent dispersibility and conductivity.
- the particle size of any 300 conductive particles (pcs) is measured by observation using a scanning electron microscope (SEM), and the average value of the obtained particle sizes is taken as the average particle size.
- the component (A) is preferably uniformly dispersed.
- the particle density of the component (A) in the adhesive film 10 is 100 pieces / mm 2 or more, 1000 pieces / mm 2 or more, 3000 pieces / mm 2 or more, or 5000 pieces / mm from the viewpoint of obtaining stable connection resistance. It may be 2 or more.
- the particle density of the component (A) in the adhesive film 10 is 100,000 pieces / mm 2 or less, 70,000 pieces / mm 2 or less, 50,000 pieces / mm 2 or less, or 30,000 from the viewpoint of improving the insulating property between adjacent electrodes. Pieces / mm 2 or less may be used.
- the content of the component (A) is 1% by mass or more, 5% by mass or more, or 10% by mass or more based on the total mass of the first adhesive layer from the viewpoint of further improving the conductivity. It may be there.
- the content of the component (A) may be 60% by mass or less, 50% by mass or less, or 40% by mass or less based on the total mass of the first adhesive layer from the viewpoint of easily suppressing a short circuit.
- the effect of the present invention tends to be remarkably exhibited.
- the content of the component (A) in the composition or the composition layer (based on the total mass of the composition or the composition layer) may be the same as the above range.
- Component (B) Photocurable resin component
- the component (B) is not particularly limited as long as it is a resin component that is cured by light irradiation, but may be a resin component having radical curability from the viewpoint of better connection resistance. ..
- the component (B) contains, for example, a radically polymerizable compound (hereinafter, may be referred to as “(B1) component”) and a photoradical polymerization initiator (hereinafter, may be referred to as “(B2) component”). You may be.
- the component (C) can be a component composed of the component (C1) and the component (C2).
- Component (B1) Radical Polymerizable Compound
- the component (B1) is a compound polymerized by radicals generated from the component (B2) by irradiation with light (for example, ultraviolet light).
- the component (B1) may be either a monomer or a polymer (or oligomer) obtained by polymerizing one or more kinds of monomers.
- the component (B1) one type may be used alone, or a plurality of them may be used in combination.
- the component (B1) is a compound having a radically polymerizable group that reacts with a radical.
- the radically polymerizable group include (meth) acryloyl group, vinyl group, allyl group, styryl group, alkenyl group, alkenylene group, maleimide group and the like.
- the number of radically polymerizable groups (number of functional groups) of the component (B1) is 2 or more from the viewpoint that the desired melt viscosity can be easily obtained after polymerization, the effect of reducing the connection resistance is further improved, and the connection reliability is superior. It may be 10 or less from the viewpoint of suppressing curing shrinkage during polymerization. Further, in order to balance the crosslink density and the curing shrinkage, in addition to the compound having the number of radically polymerizable groups within the above range, a compound having the number of radically polymerizable groups outside the above range may be used. good.
- the component (B1) may contain, for example, a polyfunctional (bifunctional or higher) (meth) acrylate from the viewpoint of suppressing the flow of conductive particles.
- the polyfunctional (bifunctional or higher) (meth) acrylate may be a bifunctional (meth) acrylate, and the bifunctional (meth) acrylate may be a bifunctional aromatic (meth) acrylate.
- polyfunctional (meth) acrylate examples include ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, and polyethylene glycol di (meth) acrylate.
- the content of the polyfunctional (bifunctional or higher) (meth) acrylate is, for example, 40 to 100, based on the total mass of the component (B1), from the viewpoint of achieving both the effect of reducing the connection resistance and the suppression of particle flow. It may be% by mass, 50 to 100% by mass, or 60 to 100% by mass.
- the component (B1) may further contain a monofunctional (meth) acrylate in addition to the polyfunctional (bifunctional or higher) (meth) acrylate.
- a monofunctional (meth) acrylate examples include (meth) acrylic acid; methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, isobutyl (meth) acrylate, and tert-butyl (meth) acrylate.
- (Meta) acrylates having an alicyclic epoxy group such as, ( Examples thereof include (meth) acrylate having an oxetanyl group such as 3-ethyloxetane-3-yl) methyl (meth) acrylate.
- the content of the monofunctional (meth) acrylate may be, for example, 0 to 60% by mass, 0 to 50% by mass, or 0 to 40% by mass based on the total mass of the component (B1).
- the cured product of the component (B) may have, for example, a polymerizable group that reacts with a substance other than a radical.
- the polymerizable group that reacts with a non-radical substance may be, for example, a cationically polymerizable group that reacts with a cation.
- the cationically polymerizable group include an epoxy group such as a glycidyl group, an alicyclic epoxy group such as an epoxycyclohexylmethyl group, and an oxetanyl group such as an ethyloxetanylmethyl group.
- the cured product of the component (B) having a polymerizable group that reacts by other than radicals is, for example, a (meth) acrylate having an epoxy group, a (meth) acrylate having an alicyclic epoxy group, and a (meth) acrylate having an oxetanyl group. It can be introduced by using a (meth) acrylate having a polymerizable group that reacts with a non-radical substance such as (B) as a component (B).
- (B1) Mass ratio of (meth) acrylate having a polymerizable group that reacts with other than radicals to the total mass of the component (mass of (meth) acrylate having a polymerizable group that reacts with other than radicals (charged amount) / (B1)
- the total mass (charged amount) of the components may be, for example, 0 to 0.7, 0 to 0.5, or 0 to 0.3 from the viewpoint of improving reliability.
- the component (B1) may contain other radically polymerizable compounds in addition to polyfunctional (bifunctional or higher) and monofunctional (meth) acrylates.
- examples of other radically polymerizable compounds include maleimide compounds, vinyl ether compounds, allyl compounds, styrene derivatives, acrylamide derivatives, nadiimide derivatives and the like.
- the content of the other radically polymerizable compound may be, for example, 0 to 40% by mass based on the total mass of the component (B1).
- Component (B2) Photoradical Polymerization Initiator
- the component (B2) comprises light containing a wavelength in the range of 150 to 750 nm, preferably light containing a wavelength in the range of 254 to 405 nm, and more preferably a wavelength in the range of 365 nm. It is a photopolymerization initiator that generates radicals by irradiation with light (for example, ultraviolet light).
- the component (B2) one type may be used alone, or a plurality of them may be used in combination.
- the component (B2) is decomposed by light to generate free radicals. That is, the component (B2) is a compound that generates radicals by applying light energy from the outside.
- the component (B2) includes an oxime ester structure, a bisimidazole structure, an acrydin structure, an ⁇ -aminoalkylphenone structure, an aminobenzophenone structure, an N-phenylglycine structure, an acylphosphine oxide structure, a benzyldimethylketal structure, and an ⁇ -hydroxyalkylphenone structure. It may be a compound having a structure such as. As the component (B2), one type may be used alone, or a plurality of them may be used in combination.
- the component (B2) is selected from the group consisting of an oxime ester structure, an ⁇ -aminoalkylphenone structure, and an acylphosphine oxide structure from the viewpoint that the desired melt viscosity can be easily obtained and the effect of reducing the connection resistance is superior. It may be a compound having at least one structure.
- the compound having an oxime ester structure examples include 1-phenyl-1,2-butandion-2- (o-methoxycarbonyl) oxime and 1-phenyl-1,2-propanedione-2- (o-methoxycarbonyl).
- the compound having an ⁇ -aminoalkylphenone structure include 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropane-1-one and 2-benzyl-2-dimethylamino-1. -Morphorinophenyl) -butanone-1 and the like.
- the compound having an acylphosphine oxide structure include bis (2,6-dimethoxybenzoyl) -2,4,4-trimethyl-pentylphosphine oxide and bis (2,4,6, -trimethylbenzoyl) -phenylphosphine.
- examples thereof include oxides, 2,4,6-trimethylbenzoyl-diphenylphosphine oxides and the like.
- the content of the component (B2) is, for example, 0.1 to 10 parts by mass, 0.3 to 7 parts by mass, or 0 with respect to 100 parts by mass of the component (B1) from the viewpoint of suppressing the flow of the conductive particles. It may be 5 to 5 parts by mass.
- the content of the cured product of the component (B) is 1% by mass or more, 5% by mass or more, or 10% by mass or more based on the total mass of the first adhesive layer from the viewpoint of suppressing the flow of the conductive particles. May be.
- the content of the cured product of the component (B) is 50% by mass or less, 40% by mass or less, or 30% by mass based on the total mass of the first adhesive layer from the viewpoint of developing low resistance in low-pressure mounting. It may be as follows. When the content of the cured product of the component (B) is in the above range, the effect of the present invention tends to be remarkably exhibited.
- the content of the component (B) in the composition or the composition layer (based on the total mass of the composition or the composition layer) may be the same as the above range.
- Thermosetting resin component is, for example, a cationically polymerizable compound (hereinafter, may be referred to as “(C1) component”) and a thermally cationic polymerization initiator (hereinafter, “(C2)). It may be referred to as "ingredient").
- the component (C) can be a component composed of the component (C1) and the component (C2).
- the first thermosetting resin component and the second thermosetting resin component mean the thermosetting resin components contained in the first adhesive layer and the second adhesive layer, respectively.
- the types, combinations, and contents of the first thermosetting resin component and the components contained in the second thermosetting resin component are the same as each other. May be different.
- Component (C1) Cationicly polymerizable compound
- the component (C1) is a compound that crosslinks by reacting with the component (C2) by heat.
- the component (C1) means a compound having no radically polymerizable group that reacts with a radical, and the component (C1) is not included in the component (B1).
- the component (C1) may be a compound having one or more ring-opening polymerizable cyclic ether groups in the molecule from the viewpoint of further improving the effect of reducing the connection resistance and improving the connection reliability.
- one type may be used alone, or a plurality of types may be used in combination.
- the compound having one or more ring-opening polymerizable cyclic ether groups in the molecule may be, for example, at least one selected from the group consisting of an oxetane compound and an alicyclic epoxy compound.
- the component (C1) preferably contains at least one oxetane compound and at least one alicyclic epoxy compound from the viewpoint that the desired melt viscosity can be easily obtained.
- the oxetane compound as the component (C1) can be used without particular limitation as long as it is a compound having an oxetane group and no radically polymerizable group.
- Commercially available oxetane compounds include, for example, ETERNCOLL OXBP (trade name, manufactured by Ube Industries, Ltd.), OXSQ, OXT-121, OXT-221, OXT-101, OXT-212 (trade name, manufactured by Toagosei Co., Ltd.). And so on. These may use one kind of compound alone or may use a plurality of compounds in combination.
- the alicyclic epoxy compound as the component (C1) can be used without particular limitation as long as it is a compound having an alicyclic epoxy group (for example, an epoxycyclohexyl group) and no radical polymerizable group.
- Examples of commercially available alicyclic epoxy compounds include EHPE3150, EHPE3150CE, CEL8010, CEL2021P, and CEL2081 (trade name, manufactured by Daicel Corporation). These may use one kind of compound alone or may use a plurality of compounds in combination.
- Component (C2) Thermal Cationic Polymerization Initiator
- the component (C2) is a thermal polymerization initiator that generates an acid or the like by heating to initiate polymerization.
- the component (C2) may be a salt compound composed of a cation and an anion.
- the component (C2) is, for example, BF 4- , BR 4- ( R indicates a phenyl group substituted with 2 or more fluorine atoms or 2 or more trifluoromethyl groups) , PF 6- , SbF 6- . , AsF 6 ⁇ and the like, sulfonium salt, phosphonium salt, ammonium salt, diazonium salt, iodonium salt, onium salt such as anilinium salt and the like. One of these may be used alone, or a plurality of them may be used in combination.
- the component (C2) is, for example, an anion containing boron as a constituent element, that is, BF 4- or BR 4- ( R is two or more fluorine atoms or two or more trifluoromethyl groups. It may be a salt compound having a substituted phenyl group.).
- the anion containing boron as a constituent element may be BR 4- , and more specifically, tetrakis (pentafluorophenyl) borate.
- the onium salt as the component (C2) may be, for example, an anilinium salt because it has resistance to a substance that can inhibit curing against cationic curing.
- anilinium salt compound examples include N, N-dialkylanilinium salts such as N, N-dimethylanilinium salt and N, N-diethylanilinium salt.
- the component (C2) may be an anilinium salt having an anion containing boron as a constituent element.
- anilinium salt compounds include CXC-1821 (trade name, manufactured by King Industries) and the like.
- the content of the component (C2) is, for example, 0 with respect to 100 parts by mass of the component (C1) from the viewpoint of ensuring the formability and curability of the adhesive film for forming the first adhesive layer. It may be 1 to 25 parts by mass, 1 to 20 parts by mass, 3 to 18 parts by mass, or 5 to 15 parts by mass.
- the content of the component (C) is 5% by mass or more based on the total mass of the first adhesive layer from the viewpoint of ensuring the curability of the adhesive film for forming the first adhesive layer. It may be 10% by mass or more, 15% by mass or more, or 20% by mass or more.
- the content of the component (C) is 70% by mass or less based on the total mass of the first adhesive layer from the viewpoint of ensuring the formability of the adhesive film for forming the first adhesive layer. It may be 60% by mass or less, 50% by mass or less, or 40% by mass or less.
- the content of the component (C) in the composition or the composition layer (based on the total mass of the composition or the composition layer) may be the same as the above range.
- the first adhesive layer 1 may further contain other components in addition to the component (A), the cured product of the component (B), and the component (C).
- other components include a thermoplastic resin (hereinafter, may be referred to as “(D) component”), a coupling agent (hereinafter, may be referred to as “(E) component”), and a filler (hereinafter, may be referred to as “component”).
- component a thermoplastic resin
- (E) component) a coupling agent
- component hereinafter, may be referred to as “component”.
- component a filler
- Etc. can be mentioned.
- the component (D) examples include phenoxy resin, polyester resin, polyamide resin, polyurethane resin, polyester urethane resin, acrylic rubber, epoxy resin (solid at 25 ° C.) and the like. One of these may be used alone, or a plurality of them may be used in combination.
- the composition layer further, the first adhesive layer 1 from the composition. Can be easily formed.
- the component (D) may be, for example, a phenoxy resin.
- the weight average molecular weight (Mw) of the component (D) may be, for example, 5000 to 200,000, 10000 to 100,000, 20000 to 80,000, or 40,000 to 60,000 from the viewpoint of resin exclusion during mounting.
- Mw means a value measured by gel permeation chromatography (GPC) and converted using the calibration curve by standard polystyrene.
- the content of the component (D) may be 1% by mass or more, 5% by mass or more, 10% by mass or more, or 20% by mass or more, 70% by mass, based on the total mass of the first adhesive layer. Hereinafter, it may be 60% by mass or less, 50% by mass or less, or 40% by mass or less.
- the content of the component (D) in the composition or the composition layer (based on the total mass of the composition or the composition layer) may be the same as the above range.
- the component (E) examples include a silane coupling agent having an organic functional group such as a (meth) acryloyl group, a mercapto group, an amino group, an imidazole group and an epoxy group, a silane compound such as tetraalkoxysilane, and a tetraalkoxy titanate derivative. , Polydialkyl titanate derivatives and the like. One of these may be used alone, or a plurality of them may be used in combination.
- the component (E) may be, for example, a silane coupling agent.
- the content of the component (E) may be 0.1 to 10% by mass based on the total mass of the first adhesive layer.
- the content of the component (E) in the composition or the composition layer (based on the total mass of the composition or the composition layer) may be the same as the above range.
- the component (F) include non-conductive fillers (for example, non-conductive particles).
- the component (F) may be either an inorganic filler or an organic filler.
- the inorganic filler include metal oxide fine particles such as silica fine particles, alumina fine particles, silica-alumina fine particles, titania fine particles, and zirconia fine particles; and inorganic fine particles such as metal nitride fine particles.
- the organic filler include organic fine particles such as silicone fine particles, methacrylate / butadiene / styrene fine particles, acrylic / silicone fine particles, polyamide fine particles, and polyimide fine particles. One of these may be used alone, or a plurality of them may be used in combination.
- the component (F) may be, for example, silica fine particles.
- the content of the component (F) may be 0.1 to 10% by mass based on the total mass of the first adhesive layer.
- the content of the component (F) in the composition or the composition layer (based on the total mass of the composition or the composition layer) may be the same as the above range.
- the component (G) examples include metal hydroxides or metal oxides.
- the component (G) includes, for example, aluminum hydroxide, aluminum oxide, magnesium hydroxide, magnesium oxide, zirconium hydroxide, zirconium oxide, bismuth hydroxide, bismuth oxide, calcium hydroxide, calcium oxide, tin hydroxide, tin oxide, and the like. It may contain at least one metal compound selected from the group consisting of manganese hydroxide, manganese oxide, antimony hydroxide, antimony oxide, silicon hydroxide, silicon oxide, titanium hydroxide and titanium oxide. These metal compounds may be surface-treated from the viewpoint of improving the dispersibility in an organic solvent.
- the component (G) may contain at least one selected from the group consisting of aluminum hydroxide, magnesium hydroxide and calcium hydroxide.
- the metal oxide is at least one selected from the group consisting of silicon oxide, aluminum oxide, magnesium oxide, antimony oxide, tin oxide, titanium oxide, manganese oxide and zirconium oxide from the viewpoint of obtaining more excellent insulation retention. Is preferable.
- the component (G) may be used alone or in combination of two or more.
- ion scavengers include, for example, "IXEPLAS-A1", “IXEPLAS-A2", “IXEPLAS-A3” (trade name, manufactured by Toagosei), and “DHT-4A-2" (trade name, Kyowa). (Made by Chemical Industry Co., Ltd.), “DHT-4A” (trade name, manufactured by Kyowa Chemical Industry Co., Ltd.).
- the component (G) may be particles containing the above metal compound.
- the primary particle diameter of the component (G) may be 10 nm or more, 20 nm or more, 1000 nm or less, or 600 nm or less.
- the average primary particle size of the component (G) can be measured by, for example, a scanning electron microscope.
- the D95 of the particle size distribution after solvent dispersion can be set to less than 5 ⁇ m.
- D95 is less than 5 ⁇ m, it becomes easy to disperse the particles of the ion scavenger satisfactorily, and the insulation maintainability between adjacent circuits can be further improved.
- the D95 can be set to less than 3 ⁇ m, and the above-mentioned effect can be further enhanced.
- the content of the component (G) may be 0.1 to 10% by mass, and 0.3 to 0.3 to 10% by mass, based on the total mass of the first adhesive layer (excluding conductive particles and inorganic filler). It may be 5% by mass.
- the content of the component (G) is 0.1% by mass or more, it is easy to secure the insulation maintainability between adjacent circuits, and when it is 10% by mass or less, the connection resistance between the opposing electrodes is unlikely to increase. Become.
- the first adhesive layer 1 may further contain other additives such as a softening agent, an accelerator, a deterioration inhibitor, a coloring agent, a flame retardant, and a thixotropic agent.
- the content of the other additives may be, for example, 0.1 to 10% by mass based on the total mass of the first adhesive layer.
- the content of other additives in the composition or the composition layer (based on the total mass of the composition or the composition layer) may be the same as the above range.
- the thickness d1 of the first adhesive layer 1 may be, for example, 5 ⁇ m or less.
- the thickness d1 of the first adhesive layer 1 may be 4.5 ⁇ m or less or 4.0 ⁇ m or less.
- the thickness d1 of the first adhesive layer 1 may be, for example, 0.1 ⁇ m or more, 0.5 ⁇ m or more, or 0.7 ⁇ m or more.
- the thickness d1 of the first adhesive layer 1 is determined by, for example, sandwiching an adhesive film between two sheets of glass (thickness: about 1 mm) and bisphenol A type epoxy resin (trade name: JER811, Mitsubishi Chemical Co., Ltd.).
- the distance to the boundary S with and (the distance indicated by d1 in FIG. 1) is the thickness of the first adhesive layer 1, and the exposed portion of the conductive particles 4 is included in the thickness of the first adhesive layer 1. I can't.
- the length of the exposed portion of the conductive particles 4 may be, for example, 0.1 ⁇ m or more, and may be 5 ⁇ m or less.
- the second adhesive layer 2 contains the component (C).
- the component (C1) and the component (C2) used in the component (C) in the second adhesive layer 2 are (C) in the first adhesive layer 1. Since it is the same as the component (C1) and the component (C2) used in the component (that is, the first thermosetting resin component), detailed description thereof will be omitted here.
- the second thermosetting resin component may be the same as or different from the first thermosetting resin component.
- the content of the component (C) is 5% by mass or more, 10% by mass or more, 15% by mass or more, or 20% by mass or more based on the total mass of the second adhesive layer from the viewpoint of maintaining reliability. May be.
- the content of the component (C) is 70% by mass or less and 60% by mass or less based on the total mass of the second adhesive layer from the viewpoint of preventing the resin seepage problem in the reel, which is one aspect of the supply form. , 50% by mass or less, or 40% by mass or less.
- the second adhesive layer 2 may further contain other components and other additives in the first adhesive layer 1. Preferred embodiments of the other components and other additives are the same as the preferred embodiments of the first adhesive layer 1.
- the content of the component (D) may be 1% by mass or more, 5% by mass or more, or 10% by mass or more, and is 80% by mass or less and 60% by mass, based on the total mass of the second adhesive layer. It may be less than or equal to 40% by mass or less.
- the content of the component (E) may be 0.1 to 10% by mass based on the total mass of the second adhesive layer.
- the content of the component (F) may be 1% by mass or more, 5% by mass or more, or 10% by mass or more, and is 70% by mass or less, 50% by mass, based on the total mass of the second adhesive layer. It may be less than or equal to 30% by mass or less.
- the content of the component (G) may be 0.1 to 10% by mass, and 0.3 to 0.3 to 10% by mass, based on the total mass of the second adhesive layer (excluding conductive particles and inorganic filler). It may be 5% by mass.
- the content of the component (G) is 0.1% by mass or more, it is easy to secure the insulation maintainability between adjacent circuits, and when it is 10% by mass or less, the connection resistance between the opposing electrodes is unlikely to increase. Become.
- the content of the other additives may be, for example, 0.1 to 10% by mass based on the total mass of the second adhesive layer.
- the thickness d2 of the second adhesive layer 2 may be appropriately set according to the height of the electrodes of the circuit member to be adhered.
- the thickness d2 of the second adhesive layer 2 is 5 ⁇ m or more or 7 ⁇ m or more from the viewpoint that the space between the electrodes can be sufficiently filled to seal the electrodes and better connection reliability can be obtained. It may be 15 ⁇ m or less or 11 ⁇ m or less.
- the thickness d2 of the second adhesive layer 2 can be obtained, for example, by the same method as the method for measuring the thickness d1 of the first adhesive layer 1.
- the first in the second adhesive layer 2 The distance from the surface 3a on the side opposite to the adhesive layer 1 side to the boundary S between the first adhesive layer 1 and the second adhesive layer 2 located at the separated portions of the adjacent conductive particles 4 and 4 ( The distance (d2) in FIG. 1 is the thickness of the second adhesive layer 2.
- the thickness of the adhesive film 10 (the total thickness of all the layers constituting the adhesive film 10, in FIG. 1, the thickness d1 of the first adhesive layer 1 and the thickness of the second adhesive layer 2).
- the total of d2) may be, for example, 5 ⁇ m or more or 8 ⁇ m or more, and may be 30 ⁇ m or less or 20 ⁇ m or less.
- the circuit connection adhesive film of the present embodiment contains a region A containing conductive particles, and also contains a component (C1), a component (C2), and a component (G), and in the region A, the component A is contained.
- the component (C1) contains a compound having one or more ring-opening polymerizable cyclic ether groups in the molecule
- the component (C2) contains an anilinium salt
- the component (G) contains aluminum hydroxide, aluminum oxide, and hydroxide.
- the circuit connection adhesive film having such a region A it is possible to sufficiently secure the continuity between the facing electrodes of the circuit connection structure and sufficiently maintain the insulation between the adjacent circuits. ..
- the first adhesive layer and the second adhesive layer may be the above-mentioned region A, and one of the first adhesive layer and the second adhesive layer may be the above-mentioned region A. It may be the region A of.
- the range of the region A in the thickness direction of the film is the thickness d1 of the first adhesive layer 1 and the second adhesive layer described above. It can be the same as the total value of the thickness d2 of 2.
- the first adhesive layer may be the region P.
- the conductive particles may be dispersed in the region P.
- the range of the region P in the thickness direction of the film can be set in the same manner as the thickness of the first adhesive layer described above.
- the content of each component in the region P can also be set in the same manner as in the first adhesive layer.
- the region A contains the specific (C1) component, the specific (C2) component, and the specific (G) component in the thickness direction of the film, and the (B) component is cured.
- the second adhesive layer may be the region S.
- the range of the region S in the thickness direction of the film can be set in the same manner as the thickness of the second adhesive layer described above.
- the content of each component in the region S can also be set in the same manner as in the second adhesive layer.
- the minimum melt viscosity of the adhesive film 10 is 450 to 1600 Pa ⁇ s.
- the minimum melt viscosity of the adhesive film 10 may be 500 Pa ⁇ s or more, 600 Pa ⁇ s or more, 700 Pa ⁇ s or more, or 800 Pa ⁇ s or more.
- the minimum melt viscosity of the adhesive film 10 is 450 Pa ⁇ s or more, it is possible to suppress the deformation of the plastic substrate during thermocompression bonding and prevent the occurrence of circuit disconnection.
- the minimum melt viscosity of the adhesive film 10 may be 1500 Pa ⁇ s or less, 1400 Pa ⁇ s or less, 1300 Pa ⁇ s or less, 1200 Pa ⁇ s or less, 1100 Pa ⁇ s or less, or 1000 Pa ⁇ s or less.
- the minimum melt viscosity of the adhesive film 10 is 1600 Pa ⁇ s or less, it is possible to suppress the deterioration of the resin exclusion property at the time of circuit connection, so that the connection resistance between the facing electrodes of the circuit connection structure can be reduced. It is possible to secure good conduction characteristics.
- the minimum melt viscosity of the adhesive film can be obtained, for example, by the following method.
- Each adhesive film is laminated with a laminator so as to have a thickness of 500 ⁇ m or more to obtain a laminated body.
- the release-treated PET is peeled off from the obtained laminate and cut into 10.0 mm ⁇ 10.0 mm to obtain a measurement sample.
- the minimum melt viscosity of the obtained measurement sample is measured using a viscoelasticity measuring device (trade name: ARES-G2, manufactured by TA Instruments, heating rate: 10 ° C./min).
- the second adhesive layer 2 is usually thicker than the first adhesive layer 1. Therefore, the minimum melt viscosity of the adhesive film 10 tends to fluctuate depending on the second adhesive layer 2.
- the minimum melt viscosity of the adhesive film 10 can be adjusted, for example, by adjusting the type, content, and the like of the constituent components (particularly, the component (D)) contained in the second adhesive layer 2. Further, the minimum melt viscosity of the adhesive film 10 can also be adjusted by using, for example, a component (F) having a small particle size. By using a component having a small particle size as the component (F), the minimum melt viscosity of the adhesive film 10 tends to increase.
- the adhesive film 10 is an anisotropically conductive adhesive film having an anisotropic conductivity.
- the adhesive film 10 is interposed between the first circuit member having the first electrode and the second circuit member having the second electrode, and holds the first circuit member and the second circuit member. It is thermocompression bonded and used to electrically connect the first electrode and the second electrode to each other.
- Such a circuit connection adhesive film can be suitably used for COP mounting. More specifically, it can be suitably used for connecting a plastic substrate on which a circuit electrode is formed in an organic EL display to an IC chip such as a drive IC.
- the adhesive film may be composed of, for example, two layers of a first adhesive layer and a second adhesive layer, and the two layers of the first adhesive layer and the second adhesive layer may be formed. It may be composed of three or more layers including.
- the adhesive film may be configured to further include, for example, a third adhesive layer provided on the opposite side of the first adhesive layer from the second adhesive layer.
- the third adhesive layer contains the component (C).
- the component (C1) and the component (C2) used in the component (C) in the third adhesive layer (that is, the third thermosetting resin component) are the component (C) in the first adhesive layer 1. Since it is the same as the component (C1) and the component (C2) used in (that is, the first thermosetting resin component), detailed description thereof will be omitted here.
- the third thermosetting resin component may be the same as or different from the first thermosetting resin component.
- the third thermosetting resin component may be the same as or different from the second thermosetting resin component.
- the content of the component (C) is 5% by mass or more, 10% by mass or more, and 15% by mass or more based on the total mass of the third adhesive layer from the viewpoint of imparting good transferability and peeling resistance. , Or 20% by mass or more.
- the content of the component (C) is 70% by mass or less based on the total mass of the third adhesive layer from the viewpoint of imparting good half-cut property and blocking resistance (suppression of resin seepage of the reel). It may be 60% by mass or less, 50% by mass or less, or 40% by mass or less.
- the third adhesive layer may further contain other components and other additives in the first adhesive layer 1.
- the third adhesive layer may have the above-mentioned configuration of the region A and has the configuration of the region S from the viewpoint of achieving both the conduction characteristics between the facing electrodes and the insulation retention between the adjacent circuits. May be.
- Preferred embodiments of the other components and other additives are the same as the preferred embodiments of the first adhesive layer 1.
- the content of the component (D) may be 10% by mass or more, 20% by mass or more, or 30% by mass or more, and is 80% by mass or less and 70% by mass, based on the total mass of the third adhesive layer. It may be less than or equal to 60% by mass or less.
- the content of the component (E) may be 0.1 to 10% by mass based on the total mass of the third adhesive layer.
- the content of the component (F) may be 1% by mass or more, 3% by mass or more, or 5% by mass or more, and is 50% by mass or less and 40% by mass, based on the total mass of the third adhesive layer. It may be less than or equal to 30% by mass or less.
- the content of the component (G) may be 0.1 to 10% by mass, and 0.3 to 0.3 to 10% by mass, based on the total mass of the third adhesive layer (excluding conductive particles and inorganic filler). It may be 5% by mass.
- the content of the component (G) is 0.1% by mass or more, it is easy to secure the insulation maintainability between adjacent circuits, and when it is 10% by mass or less, the connection resistance between the opposing electrodes is unlikely to increase. Become.
- the content of the other additives may be, for example, 0.1 to 10% by mass based on the total mass of the third adhesive layer.
- the thickness of the third adhesive layer may be appropriately set according to the minimum melt viscosity of the adhesive film, the height of the electrodes of the circuit members to be adhered, and the like.
- the thickness of the third adhesive layer is preferably smaller than the thickness d2 of the second adhesive layer 2.
- the thickness of the third adhesive layer may be 0.2 ⁇ m or more from the viewpoint that the space between the electrodes can be sufficiently filled to seal the electrodes and better connection reliability can be obtained. , 3.0 ⁇ m or less.
- the thickness of the third adhesive layer can be obtained, for example, by the same method as the method for measuring the thickness d1 of the first adhesive layer 1.
- the range in the thickness direction of the film of the region A is the thickness of the first adhesive layer, the second. It can be the same as the total value of the thickness of the adhesive layer and the thickness of the third adhesive layer. Further, when the third adhesive layer is the region S, the range of the region S in the thickness direction can be the same as the thickness of the third adhesive layer.
- the circuit connection adhesive film of the above embodiment may be a conductive adhesive film having no anisotropic conductivity.
- the method for producing an adhesive film for circuit connection is, for example, a component (A), a component (B), and a component (C) (first thermosetting resin component), and if necessary (G).
- the component (C) (third thermosetting resin component) and, if necessary, (G) are placed on a layer of the first adhesive layer opposite to the second adhesive layer.
- a step of laminating a third adhesive layer containing the component (third step) may be further provided.
- the second step may be performed first, or the third step may be performed first.
- the third adhesive layer is laminated on the side opposite to the side where the second adhesive layer of the first adhesive layer is to be laminated.
- the component (A), the component (B), and the component (C), and other components such as the component (G) added as needed, and other additives are contained.
- the composition to be prepared is dissolved or dispersed by stirring and mixing in an organic solvent, kneading, etc. to prepare a varnish composition (a first varnish-like adhesive composition).
- the varnish composition is applied onto the mold-released substrate using a knife coater, roll coater, applicator, comma coater, die coater, etc., and then the organic solvent is volatilized by heating to form the substrate.
- a composition layer composed of the composition.
- the thickness of the finally obtained first adhesive layer can be adjusted by adjusting the coating amount of the varnish composition.
- the composition layer made of the composition is irradiated with light to cure the component (B) in the composition layer, and a first adhesive layer is formed on the substrate.
- the first adhesive layer can be said to be the first adhesive film.
- the organic solvent used in the preparation of the varnish composition is not particularly limited as long as it has the property of uniformly dissolving or dispersing each component.
- examples of such an organic solvent include toluene, acetone, methyl ethyl ketone, methyl isobutyl ketone, ethyl acetate, propyl acetate, butyl acetate and the like. These organic solvents can be used alone or in combination of two or more.
- Stirring and mixing or kneading in the preparation of the varnish composition can be carried out by using, for example, a stirrer, a raider, a three-roll, a ball mill, a bead mill, a homodisper or the like.
- the base material is not particularly limited as long as it has heat resistance that can withstand the heating conditions when volatilizing the organic solvent.
- a substrate examples include stretched polypropylene (OPP), polyethylene terephthalate (PET), polyethylene naphthalate, polyethylene isophthalate, polyvinylidene terephthalate, polyolefin, polyacetate, polycarbonate, polyphenylene sulfide, polyamide, polyimide, cellulose, and the like.
- a substrate (for example, a film) made of an ethylene / vinyl acetate copolymer, polyvinyl chloride, polyvinylidene chloride, a synthetic rubber system, a liquid crystal polymer or the like can be used.
- the heating conditions for volatilizing the organic solvent from the varnish composition applied to the base material can be appropriately set according to the organic solvent to be used and the like.
- the heating conditions may be, for example, 40 to 120 ° C. for 0.1 to 10 minutes.
- a part of the solvent may remain in the first adhesive layer without being removed.
- the content of the solvent in the first adhesive layer may be, for example, 10% by mass or less based on the total mass of the first adhesive layer.
- irradiation light for example, ultraviolet light
- Light irradiation can be performed using, for example, a low-pressure mercury lamp, a medium-pressure mercury lamp, a high-pressure mercury lamp, an ultra-high-pressure mercury lamp, a xenon lamp, a metal halide lamp, an LED light source, or the like.
- the integrated light amount of light irradiation can be appropriately set, but may be, for example, 500 to 3000 mJ / cm 2 .
- the second step is a step of laminating the second adhesive layer on the first adhesive layer.
- the second step for example, except that the component (C) and other components such as the component (G) added as needed and other additives are used and no light irradiation is performed.
- a second adhesive layer is formed on the substrate to obtain a second adhesive film.
- the second adhesive layer can be laminated on the first adhesive layer by adhering the first adhesive film and the second adhesive film.
- the component (C) and other components such as the component (G) added as needed and other additives are used on the first adhesive layer.
- the second adhesive layer can also be laminated on the first adhesive layer by applying the varnish composition (varnish-like second adhesive composition) and volatilizing the organic solvent.
- Examples of the method of adhering the first adhesive film and the second adhesive film include a method of heat pressing, roll laminating, vacuum laminating and the like. Lamination can be performed, for example, under temperature conditions of 0 to 80 ° C.
- a part of the solvent may remain on the second adhesive layer without being removed.
- the content of the solvent in the second adhesive layer may be, for example, 10% by mass or less based on the total mass of the second adhesive layer.
- the third step is a step of laminating the third adhesive layer on the layer of the first adhesive layer opposite to the second adhesive layer.
- a third adhesive layer is formed on the substrate to obtain a third adhesive film.
- the varnish composition (crocodile-like third) is placed on the layer of the first adhesive layer opposite to the second adhesive layer.
- the third adhesive layer can be laminated on the first adhesive layer by applying the adhesive composition of the above) and volatilizing the organic solvent. The method of bonding and the conditions thereof are the same as in the second step.
- a part of the solvent may remain on the third adhesive layer without being removed.
- the content of the solvent in the third adhesive layer may be, for example, 10% by mass or less based on the total mass of the third adhesive layer.
- the circuit connection adhesive composition of the present embodiment contains a cationically polymerizable compound, a thermally cationic polymerization initiator, and an ion trapping agent, and the cationically polymerizable compound is a ring-opening polymerizable cyclic ether in the molecule. It contains a compound having one or more groups, the thermal cationic polymerization initiator contains anilinium salt, and the ion trapping agent is aluminum hydroxide, aluminum oxide, magnesium hydroxide, magnesium oxide, zirconium hydroxide, zirconium oxide, bismuth hydroxide.
- Bismus oxide calcium hydroxide, calcium oxide, tin hydroxide, tin oxide, manganese hydroxide, manganese oxide, antimony hydroxide, antimony oxide, silicon hydroxide, silicon oxide, titanium hydroxide and titanium oxide. Contains at least one metal compound.
- An adhesive layer or the like can be formed.
- the circuit connection adhesive composition of the present embodiment can further contain conductive particles and can further contain a photocurable resin component.
- Such a circuit connection adhesive composition can form the region P or the first adhesive layer in the circuit connection adhesive film described above.
- composition of the circuit connection adhesive composition of the present embodiment can be set in the same manner as the composition in the first adhesive layer, the second adhesive layer or the third adhesive layer described above.
- Circuit connection structure and its manufacturing method> a circuit connection structure using the above-mentioned circuit connection adhesive film 10 as a circuit connection material and a method for manufacturing the same will be described.
- FIG. 2 is a schematic cross-sectional view showing an embodiment of a circuit connection structure.
- the circuit connection structure 20 includes a first circuit member 13 having a first electrode 12 formed on a main surface 11a of the first circuit board 11 and the first circuit board 11.
- a second circuit member 16 having a second electrode 15 formed on the main surface 14a of the second circuit board 14 and the second circuit board 14, and the first circuit member 13 and the second circuit member. It is arranged between 16 and includes a circuit connection portion 17 that electrically connects the first electrode 12 and the second electrode 15 to each other.
- the first circuit member 13 and the second circuit member 16 may be the same or different from each other.
- the first circuit member 13 and the second circuit member 16 are a glass substrate or a plastic substrate on which a circuit electrode is formed; a printed wiring board; a ceramic wiring board; a flexible wiring board; an IC chip such as a drive IC, or the like. It's okay.
- the first circuit board 11 and the second circuit board 14 may be formed of an inorganic substance such as semiconductor, glass, or ceramic, an organic substance such as polyimide or polycarbonate, or a composite such as glass / epoxy.
- the first circuit board 11 may be a plastic substrate.
- the first circuit member 13 may be, for example, a plastic substrate on which a circuit electrode is formed (a plastic substrate made of an organic substance such as polyimide, polycarbonate, polyethylene terephthalate, or cycloolefin polymer), and the second circuit member 16 may be.
- a plastic substrate on which a circuit electrode is formed a plastic substrate made of an organic substance such as polyimide, polycarbonate, polyethylene terephthalate, or cycloolefin polymer
- the second circuit member 16 may be.
- it may be an IC chip such as a drive IC.
- a display region is formed by regularly arranging a pixel drive circuit such as an organic TFT or a plurality of organic EL elements R, G, and B in a matrix on the plastic substrate. It may be the one.
- the first electrode 12 and the second electrode 15 are gold, silver, tin, ruthenium, rhodium, palladium, osmium, iridium, platinum, copper, aluminum, molybdenum, titanium and other metals, indium tin oxide (ITO), and the like.
- the electrode may be an electrode containing an oxide such as indium tin oxide (IZO) or indium gallium zinc oxide (IGZO).
- the first electrode 12 and the second electrode 15 may be electrodes formed by laminating two or more of these metals, oxides, and the like.
- the electrode formed by stacking two or more types may have two or more layers, and may have three or more layers.
- the first electrode 12 When the first circuit member 13 is a plastic substrate, the first electrode 12 may be an electrode having a titanium layer on the outermost surface.
- the first electrode 12 and the second electrode 15 may be circuit electrodes or bump electrodes. At least one of the first electrode 12 and the second electrode 15 may be a bump electrode.
- the first electrode 12 is a circuit electrode and the second electrode 15 is a bump electrode.
- the circuit connection portion 17 contains a cured product of the above-mentioned adhesive film 10.
- the circuit connection portion 17 may be made of a cured product of the adhesive film 10 described above.
- the circuit connection portion 17 is located, for example, on the side of the first circuit member 13 in the direction in which the first circuit member 13 and the second circuit member 16 face each other (hereinafter referred to as “opposite direction”), and the above-mentioned first circuit member 17 is located. It is located on the side of the first region 18 composed of the cured product of the component (B) and the cured product of the component (C) other than the conductive particles 4 in the adhesive layer of No. 1 and the second circuit member 16 in the opposite direction.
- the first electrode 12 and the first electrode 12 are interposed between the second region 19 made of a cured product such as the component (C) in the second adhesive layer and at least the first electrode 12 and the second electrode 15. It has conductive particles 4 that electrically connect the second electrodes 15 to each other. As shown in FIG. 2, the circuit connection portion 17 does not have to have two distinct regions between the first region 18 and the second region 19, and the first adhesive layer The cured product derived from the above and the cured product derived from the second adhesive layer may be mixed to form one region.
- the circuit connection structure is, for example, a flexible organic electroluminescent color display (organic EL display) in which a plastic substrate on which organic EL elements are regularly arranged and a drive circuit element which is a driver for displaying an image are connected.
- organic EL display organic electroluminescent color display
- Examples thereof include a touch panel in which a plastic substrate on which organic EL elements are regularly arranged and a position input element such as a touch pad are connected.
- the circuit connection structure can be applied to various monitors such as smart phones, tablets, televisions, vehicle navigation systems, wearable terminals, furniture; home appliances; daily necessities and the like.
- FIG. 3 is a schematic cross-sectional view showing an embodiment of a method for manufacturing a circuit connection structure.
- 3 (a) and 3 (b) are schematic cross-sectional views showing each process.
- a method of manufacturing the circuit connection structure 20 is to use a method of manufacturing the circuit connection structure 20 between the first circuit member 13 having the first electrode 12 and the second circuit member 16 having the second electrode 15.
- the above-mentioned adhesive film 10 is interposed, and the first circuit member 13 and the second circuit member 16 are thermally crimped to electrically connect the first electrode 12 and the second electrode 15 to each other. ..
- a first circuit including a first electrode 12 formed on a main surface 11a of a first circuit board 11 and a first circuit board 11.
- a member 13 and a second circuit board 16 having a second electrode 15 formed on the main surface 14a of the second circuit board 14 and the second circuit board 14 are prepared.
- the first circuit member 13 and the second circuit member 16 are arranged so that the first electrode 12 and the second electrode 15 face each other, and the first circuit member 13 and the second circuit member 12 are arranged.
- the adhesive film 10 is placed between the 16 and 16.
- the adhesive film 10 is laminated on the first circuit member 13 so that the first adhesive layer 1 side faces the main surface 11a of the first circuit board 11. do.
- the adhesive film 10 is laminated so that the first electrode 12 on the first circuit board 11 and the second electrode 15 on the second circuit board 14 face each other.
- the second circuit member 16 is arranged on the circuit member 13.
- the first circuit member 13 and the second circuit member 16 are thermocompression bonded to each other.
- the second adhesive layer 2 has a flowable uncured thermosetting component, the second electrodes 15 are connected to each other. It flows so as to fill the voids and is cured by the above heating. As a result, the first electrode 12 and the second electrode 15 are electrically connected to each other via the conductive particles 4, and the first circuit member 13 and the second circuit member 16 are adhered to each other.
- the circuit connection structure 20 shown in 2 can be obtained.
- the method for manufacturing the circuit connection structure 20 of the present embodiment it can be said that a part of the first adhesive layer 1 is cured by light irradiation, so that the conductive particles in the first adhesive layer 1 flow. It is suppressed, the first adhesive layer 1 hardly flows during the thermal pressure bonding, and the conductive particles are efficiently captured between the facing electrodes. Therefore, between the facing first electrodes 12 and the second electrodes 15. Connection resistance is reduced. Further, when the thickness of the first adhesive layer is 5 ⁇ m or less, the conductive particles at the time of circuit connection tend to be captured more efficiently.
- the heating temperature for thermocompression bonding can be set as appropriate, but may be, for example, 50 to 190 ° C.
- the pressurization is not particularly limited as long as it does not damage the adherend, but in the case of COP mounting, for example, the area conversion pressure at the bump electrode may be 0.1 to 50 MPa, and may be 40 MPa or less. It may be 0.1 to 40 MPa. Further, in the case of COG mounting, for example, the area conversion pressure at the bump electrode may be 10 to 100 MPa.
- Conductive particles A-1 Conductive particles with an average particle size of 3.2 ⁇ m, in which the surface of the plastic core is Ni-plated and the outermost surface is substituted-plated with Pd, are used.
- (B) component Photocurable resin component (B1) component: Radical polymerizable compound B1-1: A-BPEF70T (ethoxylated fluorene type di (meth) acrylate (bifunctional), manufactured by Shin Nakamura Chemical Industry Co., Ltd.), Use a non-volatile content diluted to 70% by mass with toluene B1-2: Lipoxy VR-90 (bisphenol A type epoxy (meth) acrylate (bifunctional) (vinyl ester resin), manufactured by Showa Denko Co., Ltd.)
- Photo-radical polymerization initiator B2-1 Irgacure907 (compound having ⁇ -aminoalkylphenone structure, manufactured by BASF), diluted to 10% by mass of non-volatile content with MEK.
- C component Thermosetting resin component (C1) component: Cationic polymerizable compound
- C1-1 ETERNACOLL OXBP (3-ethyl-3-hydroxymethyloxetane, manufactured by Ube Industries, Ltd.)
- C1-2 EHPE3150 (1,2-epoxy-4- (2-oxylanyl) cyclohexane adduct of 2,2-bis (hydroxymethyl) -1-butanol, manufactured by Daicel Corporation)
- C1-3 Celoxide 8010 (B-7-oxabicyclo [4.1.0] heptane, manufactured by Daicel Corporation)
- C1-4 OX-SQ TX-100 (poly ( ⁇ 3-[(3-ethyl-3-oxetanyl) methoxy] propyl ⁇ silsesquioxane) derivative, manufactured by Toagosei Corporation)
- Epoxy resin D-1 Phenototo YP-50S (bisphenol A type phenoxy resin, weight average molecular weight: 60,000, glass transition temperature: 84 ° C., manufactured by Nittetsu Chemical & Materials Co., Ltd.), MEK D-2: TOPR-300 (high Tg type epoxy resin, epoxy equivalent: 900-1,000, softening point: 120 ° C, manufactured by Nittetsu Chemical & Materials Co., Ltd.) D-3: Phenotote ZX-1356-2 (bisphenol A type and bisphenol F type copolymer phenoxy resin, weight average molecular weight: 70000, glass transition temperature: 71 ° C, manufactured by Nittetsu Chemical & Materials Co., Ltd.), MEK diluted to 40% by mass of non-volatile content
- F Component: Filler F-1: Admafine SE2050 (Silica fine particles, manufactured by Admatex Co., Ltd.)
- G Component: Ion scavenger
- G-1 IXEPLAS-A1 (Zr, Mg, Al-based scavenger, manufactured by Toagosei Co., Ltd., primary particle size 500 nm)
- G-2 IXEPLAS-A2 (Zr, Mg, Al-based ion scavenger, manufactured by Toagosei Co., Ltd., primary particle size 200 nm)
- G-3 IXEPLAS-A3 (Surface treatment type of IXEPLAS-Al, manufactured by Toagosei Co., Ltd.)
- G-4 DHT-4A-2 (Mg, Al-based ion scavenger, manufactured by Kyowa Chemical Industry Co., Ltd.)
- the above ion scavenger used was finely pulverized to adjust D95 to less than 5 ⁇ m.
- ⁇ Preparation of the first adhesive layer> A composition obtained by mixing the materials shown in Table 1 at the composition ratio shown in Table 1 (the numerical value in Table 1 means the non-volatile content) is obtained, and then a magnetic field is applied onto the PET (polyethylene terephthalate) film which has been demolded. The coating was carried out while applying, and the organic solvent and the like were dried with hot air at 70 ° C. for 5 minutes to obtain a composition layer composed of a composition containing each component. The composition layer was coated so that the thickness after drying was 3 to 4 ⁇ m, respectively.
- a first adhesive layer in which conductive particles were dispersed was prepared.
- the thickness was measured using a contact thickness gauge.
- the thickness of the layer made of the first adhesive composition or the adhesive layer is smaller than the thickness (diameter) of the conductive particles
- the thickness of the layer is measured using a contact type thickness gauge, and the conductive particles are measured.
- the thickness of the region where the conductive particles are present is measured. Therefore, after producing a two-layer adhesive film in which the first adhesive layer and the second adhesive layer are laminated, the adhesive film is adjacent to each other by the above method (paragraph 0083) using a scanning electron microscope. The thickness of the first adhesive layer located at the separated portion of the matching conductive particles was measured.
- ⁇ Preparation of second adhesive layer> A composition in which the materials shown in Table 2 are mixed at the composition ratio shown in Table 2 (the numerical value in Table 2 means the amount of non-volatile content) is obtained, and then coated on a PET (polyethylene terephthalate) film which has been demolded. Then, the organic solvent and the like were dried with hot air at 70 ° C. for 5 minutes to prepare a second composition layer composed of a composition containing each component. The composition layer was coated so that the thickness after drying was 8 to 9 ⁇ m, respectively. The thickness here was measured using a contact thickness gauge.
- Examples 1 to 4 and Comparative Examples 1 to 2 [Preparation of adhesive film]
- an adhesive film having the constitution shown in Table 3 was prepared.
- the first adhesive layer formed by the composition P-1 is placed on the second adhesive layer formed by the composition S-1 at a temperature of 50 to 60 ° C.
- the adhesive film of Example 1 was obtained by laminating while sprinkling.
- the adhesive films having the configurations shown in Table 3 were prepared in the same manner as in Example 1.
- circuit connection structure-1 As the first circuit member, an IC chip (0.9 mm ⁇ 20.3 mm, thickness: 0.3 mm, bump electrode size: 70 ⁇ m ⁇ 12 ⁇ m, space between bump electrodes) in which bump electrodes are arranged in two rows in a staggered pattern. : 12 ⁇ m, bump electrode thickness: 9 ⁇ m) was prepared. Further, as a second circuit member, a wiring pattern (pattern width) of Ti: 50 nm / Al: 400 nm is provided on the surface of a polyimide substrate (manufactured by Toray DuPont Co., Ltd., 200H) (38 mm ⁇ 28 mm, thickness: 0.05 mm). : 17 ⁇ m, space between electrodes: 7 ⁇ m) was formed.
- a polyimide substrate manufactured by Toray DuPont Co., Ltd., 200H
- Circuit connection structures were produced using the adhesive films of Examples 1 to 4 and Comparative Examples 1 and 2.
- the adhesive film was cut out to a width of 2.0 mm, and the adhesive film was placed on the first circuit member so that the first adhesive layer and the first circuit member were in contact with each other.
- a thermocompression bonding device (BS-17U, manufactured by Ohashi Seisakusho Co., Ltd.) consisting of a stage consisting of a ceramic heater and a tool (8 mm x 50 mm), under the conditions of 70 ° C. and 0.98 MPa (10 kgf / cm 2 ).
- the adhesive film was attached to the first circuit member by heating and pressurizing for 2 seconds, and the release film on the opposite side of the adhesive film from the first circuit member was peeled off.
- a heat tool was used at 8 mm ⁇ 45 mm, and Teflon (registered trademark) having a thickness of 50 ⁇ m was used as a cushioning material.
- Teflon registered trademark
- the second adhesive layer of the adhesive film is attached to the second circuit member by heating and pressurizing for 5 seconds under the conditions of a connection condition of 170 ° C. and an area conversion pressure of 30 MPa at the bump electrode to form a circuit connection structure.
- Body-1 was prepared respectively.
- an IC chip (0.9 mm ⁇ 20.3 mm, thickness: 0.3 mm, bump electrode size: 70 ⁇ m ⁇ 12 ⁇ m, space between bump electrodes) in which bump electrodes are arranged in two rows in a staggered pattern. : 12 ⁇ m, bump electrode thickness: 9 ⁇ m) was prepared.
- an ITO wiring pattern (pattern width: 19 ⁇ m, space between electrodes: 5 ⁇ m) is formed on the surface of a glass substrate (Corning Inc., # 1737, 38 mm ⁇ 28 mm, thickness: 0.05 mm). was prepared.
- Circuit connection structures were produced using the adhesive films of Examples 1 to 4 and Comparative Examples 1 and 2.
- the adhesive film was cut out to a width of 2.0 mm, and the adhesive film was placed on the first circuit member so that the first adhesive layer and the first circuit member were in contact with each other.
- a thermocompression bonding device (BS-17U, manufactured by Ohashi Seisakusho Co., Ltd.) consisting of a stage consisting of a ceramic heater and a tool (8 mm x 50 mm), under the conditions of 70 ° C. and 0.98 MPa (10 kgf / cm 2 ).
- the adhesive film was attached to the first circuit member by heating and pressurizing for 2 seconds, and the release film on the opposite side of the adhesive film from the first circuit member was peeled off.
- a heat tool was used at 8 mm ⁇ 45 mm, and Teflon (registered trademark) having a thickness of 50 ⁇ m was used as a cushioning material.
- Teflon registered trademark
- the second adhesive layer of the adhesive film is attached to the second circuit member by heating and pressurizing for 5 seconds under the conditions of a connection condition of 170 ° C. and an area conversion pressure of 30 MPa at the bump electrode to form a circuit connection structure.
- Body-2 was prepared respectively.
- connection resistance The initial connection resistance (conduction resistance) of the produced circuit connection structure-1 was measured by the 4-terminal method. A multimeter MLR21 manufactured by ETAC was used for the measurement. The potential difference was measured at any 14 points, and the average value was obtained. The average value of the potential difference was converted into the connection resistance value and evaluated according to the following criteria. The results are shown in Table 3.
- the adhesive films of Examples 1 to 4 containing the cationically polymerizable compound, the thermal cationic polymerization initiator and the ion scavenger described above were judged as A in both the connection resistance and the insulation resistance. ..
- the connection resistance was judged as A, but the insulation resistance was judged as C.
- the insulation resistance was judged as B, but the connection resistance was high and the judgment was B.
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Abstract
Description
本実施形態の回路接続用接着剤フィルムは、導電粒子を含み、なおかつ、フィルムの厚さ方向において、カチオン重合性化合物と、熱カチオン重合開始剤と、イオン捕捉剤と、を含有する領域Aを含む。導電粒子は、フィルムの一方の面側に偏在していてもよく、領域Aが、フィルムの厚さ方向において、光硬化性樹脂成分の硬化物を更に含有する領域Pを含み、当該領域Pに導電粒子が分散していてもよい。また、領域Aは、フィルムの厚さ方向において、カチオン重合性化合物と、熱カチオン重合開始剤と、イオン捕捉剤とを含有し、光硬化性樹脂成分の硬化物を含有しない領域Sを含んでいてもよい。
第1の接着剤層1は、導電粒子4(以下、「(A)成分」という場合がある。)、光硬化性樹脂成分(以下、「(B)成分」という場合がある。)の硬化物、及び熱硬化性樹脂成分(以下、「(C)成分」という場合がある。)を含有する。第1の接着剤層1は、例えば、(A)成分、(B)成分、及び(C)成分を含有する組成物からなる組成物層に対して光エネルギーを照射し、(B)成分に含まれる成分を重合させ、(B)成分を硬化させることによって得ることができる。第1の接着剤層1は、(A)成分と、(B)成分の硬化物及び(C)成分を含む接着剤成分5とを含有する。(B)成分の硬化物は、(B)成分を完全に硬化させた硬化物であってもよく、(B)成分の一部を硬化させた硬化物であってもよい。(C)成分は、回路接続時に流動可能な成分であり、例えば、未硬化の硬化性樹脂成分である。
(A)成分は、導電性を有する粒子であれば特に制限されず、Au、Ag、Pd、Ni、Cu、はんだ等の金属で構成された金属粒子、導電性カーボンで構成された導電性カーボン粒子などであってよい。(A)成分は、非導電性のガラス、セラミック、プラスチック(ポリスチレン等)などを含む核と、上記金属又は導電性カーボンを含み、核を被覆する被覆層とを備える被覆導電粒子であってもよい。これらの中でも、(A)成分は、好ましくは熱溶融性の金属で形成された金属粒子、又はプラスチックを含む核と、金属又は導電性カーボンを含み、核を被覆する被覆層とを備える被覆導電粒子である。このような被覆導電粒子は、熱硬化性樹脂成分の硬化物を加熱又は加圧により変形させることが容易であるため、電極同士を電気的に接続する際に、電極と(A)成分との接触面積を増加させ、電極間の導電性をより向上させることができる。
(B)成分は、光照射によって硬化する樹脂成分であれば特に制限されないが、接続抵抗がより優れる観点から、ラジカル硬化性を有する樹脂成分であってよい。(B)成分は、例えば、ラジカル重合性化合物(以下、「(B1)成分」という場合がある。)及び光ラジカル重合開始剤(以下、「(B2)成分」という場合がある。)を含んでいてもよい。(C)成分は、(C1)成分及び(C2)成分からなる成分であり得る。
(B1)成分は、光(例えば、紫外光)の照射によって(B2)成分から発生したラジカルによって重合する化合物である。(B1)成分は、モノマー、又は、1種若しくは2種以上のモノマーが重合してなるポリマー(又はオリゴマー)のいずれであってもよい。(B1)成分は、1種を単独で用いてもよく、複数を組み合わせて用いてもよい。
(B2)成分は、150~750nmの範囲内の波長を含む光、好ましくは254~405nmの範囲内の波長を含む光、さらに好ましくは365nmの波長を含む光(例えば紫外光)の照射によってラジカルを発生する光重合開始剤である。(B2)成分は、1種を単独で用いてもよく、複数を組み合わせて用いてもよい。
(C)成分は、例えば、カチオン重合性化合物(以下、「(C1)成分」という場合がある。)及び熱カチオン重合開始剤(以下、「(C2)成分」という場合がある。)を含んでいてもよい。(C)成分は、(C1)成分及び(C2)成分からなる成分であり得る。なお、第1の熱硬化性樹脂成分及び第2の熱硬化性樹脂成分は、それぞれ第1の接着剤層及び第2の接着剤層に含有される熱硬化性樹脂成分を意味する。第1の熱硬化性樹脂成分及び第2の熱硬化性樹脂成分に含まれる成分(例えば、(C1)成分、(C2)成分等)の種類、組み合わせ、及び含有量は、互いに同一であってもよく、異なっていてもよい。
(C1)成分は、熱によって(C2)成分と反応することによって架橋する化合物である。なお、(C1)成分は、ラジカルによって反応するラジカル重合性基を有しない化合物を意味し、(C1)成分は、(B1)成分に包含されない。(C1)成分は、接続抵抗の低減効果がさらに向上し、接続信頼性により優れる観点から、分子中に開環重合性の環状エーテル基を1個以上有する化合物であってよい。(C1)成分は、1種を単独で用いてもよく、複数を組み合わせて用いてもよい。分子中に開環重合性の環状エーテル基を1個以上有する化合物としては、例えば、オキセタン化合物及び脂環式エポキシ化合物からなる群より選ばれる少なくとも1種であってよい。(C1)成分は、所望の溶融粘度が得られ易い観点から、オキセタン化合物の少なくとも1種及び脂環式エポキシ化合物の少なくとも1種の両方を含むことが好ましい。
(C2)成分は、加熱により酸等を発生して重合を開始する熱重合開始剤である。(C2)成分はカチオンとアニオンとから構成される塩化合物であってよい。(C2)成分は、例えば、BF4 -、BR4 -(Rは、2以上のフッ素原子又は2以上のトリフルオロメチル基で置換されたフェニル基を示す。)、PF6 -、SbF6 -、AsF6 -等のアニオンを有する、スルホニウム塩、ホスホニウム塩、アンモニウム塩、ジアゾニウム塩、ヨードニウム塩、アニリニウム塩等のオニウム塩などが挙げられる。これらは、1種を単独で用いてもよく、複数を組み合わせて用いてもよい。
第1の接着剤層1は、(A)成分、(B)成分の硬化物、及び(C)成分以外にその他の成分をさらに含有していてもよい。その他の成分としては、例えば、熱可塑性樹脂(以下、「(D)成分」という場合がある。)、カップリング剤(以下、「(E)成分」という場合がある。)、充填材(以下、「(F)成分」という場合がある。)、イオン捕捉剤(以下、「G」成分)という場合がある。)等が挙げられる。
第1の接着剤層1は、軟化剤、促進剤、劣化防止剤、着色剤、難燃化剤、チキソトロピック剤等のその他の添加剤をさらに含有していてもよい。その他の添加剤の含有量は、第1の接着剤層の全質量を基準として、例えば、0.1~10質量%であってよい。なお、組成物又は組成物層中のその他の添加剤の含有量(組成物又は組成物層の全質量基準)は上記範囲と同様であってよい。
第2の接着剤層2は、(C)成分を含有する。第2の接着剤層2における(C)成分(すなわち、第2の熱硬化性樹脂成分)で使用される(C1)成分及び(C2)成分は、第1の接着剤層1における(C)成分(すなわち、第1の熱硬化性樹脂成分)で使用される(C1)成分及び(C2)成分と同様であることから、ここでは詳細な説明は省略する。第2の熱硬化性樹脂成分は、第1の熱硬化性樹脂成分と同一であっても、異なっていてもよい。
(最低溶融粘度の測定方法)
各接着剤フィルムを厚さが500μm以上となるようにラミネータで積層して積層体を得る。得られた積層体から離型処理されたPETを剥離し、10.0mm×10.0mmに切り出して測定試料を得る。得られた測定試料を粘弾性測定装置(商品名:ARES-G2、TAインスツルメンツ社製、昇温速度:10℃/min)を用いて最低溶融粘度を測定する。
一実施形態の回路接続用接着剤フィルムの製造方法は、例えば、(A)成分、(B)成分、及び(C)成分(第1の熱硬化性樹脂成分)、並びに必要に応じて(G)成分を含有する組成物からなる組成物層に対して光を照射し、第1の接着剤層を形成する工程(第1の工程)と、第1の接着剤層上に、(C)成分(第2の熱硬化性樹脂成分)、及び必要に応じて(G)成分を含有する第2の接着剤層を積層する工程(第2の工程)とを備えていてもよい。当該製造方法は、第1の接着剤層の第2の接着剤層とは反対側の層上に、(C)成分(第3の熱硬化性樹脂成分)、及び必要に応じて(G)成分を含有する第3の接着剤層を積層する工程(第3の工程)をさらに備えていてもよい。この場合、第2の工程を先に行ってもよく、第3の工程を先に行ってもよい。第3の工程を先に行う場合、第1の接着剤層の第2の接着剤層が積層される予定の側とは反対側に第3の接着剤層を積層される。
本実施形態の回路接続用接着剤組成物は、カチオン重合性化合物と、熱カチオン重合開始剤と、イオン捕捉剤と、を含有し、カチオン重合性化合物が分子中に開環重合性の環状エーテル基を1個以上有する化合物を含み、熱カチオン重合開始剤がアニリニウム塩を含み、イオン捕捉剤が、水酸化アルミニウム、酸化アルミニウム、水酸化マグネシウム、酸化マグネシウム、水酸化ジルコニウム、酸化ジルコニウム、水酸化ビスマス、酸化ビスマス、水酸化カルシウム、酸化カルシウム、水酸化錫、酸化錫、水酸化マンガン、酸化マンガン、水酸化アンチモン、酸化アンチモン、水酸化ケイ素、酸化ケイ素、水酸化チタン及び酸化チタンからなる群より選ばれる少なくとも一種の金属化合物を含む。
以下、回路接続材料として上述の回路接続用接着剤フィルム10を用いた回路接続構造体及びその製造方法について説明する。
第1の接着剤層及び第2の接着剤層の作製においては、下記に示す材料を用いた。
A-1:プラスチック核体の表面にNiめっきを施し、最表面にPdで置換めっきを施した、平均粒径3.2μmの導電粒子を使用
(B1)成分:ラジカル重合性化合物
B1-1:A-BPEF70T(エトキシ化フルオレン型ジ(メタ)アクリレート(2官能)、新中村化学工業株式会社製)、トルエンで不揮発分70質量%に希釈したものを使用
B1-2:リポキシ VR-90(ビスフェノールA型エポキシ(メタ)アクリレート(2官能)(ビニルエステル樹脂)、昭和電工株式会社製)
B2-1:Irgacure907(α-アミノアルキルフェノン構造を有する化合物、BASF社製)、MEKで不揮発分10質量%に希釈したものを使用
(C1)成分:カチオン重合性化合物
C1-1:ETERNACOLL OXBP(3-エチル-3-ヒドロキシメチルオキセタン、宇部興産株式会社製)
C1-2:EHPE3150(2,2-ビス(ヒドロキシメチル)-1-ブタノールの1,2-エポキシ-4-(2-オキシラニル)シクロヘキサン付加物、株式会社ダイセル株式会社製)
C1-3:セロキサイド8010(ビ-7-オキサビシクロ[4.1.0]ヘプタン、株式会社ダイセル株式会社製)
C1-4:OX-SQ TX-100(ポリ({3-[(3-エチル-3-オキセタニル)メトキシ]プロピル}シルセスキオキサン)誘導体、東亜合成株式会社製)
C2-1:CXC-1821(King Industries社製)
D-1:フェノトート YP-50S(ビスフェノールA型フェノキシ樹脂、重量平均分子量:60,000、ガラス転移温度:84℃、日鉄ケミカル&マテリアル株式会社製)、MEKで不揮発分40質量%に希釈したものを使用
D-2:TOPR-300(高Tgタイプエポキシ樹脂、エポキシ当量:900~1,000、軟化点:120℃、日鉄ケミカル&マテリアル株式会社製)、MEKで不揮発分60質量%に希釈したものを使用
D-3:フェノトート ZX-1356-2(ビスフェノールA型及びビスフェノールF型の共重合型フェノキシ樹脂、重量平均分子量:70000、ガラス転移温度:71℃、日鉄ケミカル&マテリアル株式会社製)、MEKで不揮発分40質量%に希釈したものを使用
E-1:SH-6040(3-グリシドキシプロピルトリメトキシシラン、東レ・ダウコーニング株式会社製)
F-1:アドマファイン SE2050(シリカ微粒子、株式会社アドマテックス製)
G-1:IXEPLAS-A1(Zr,Mg,Al系イオン捕捉剤、東亜合成株式会社製、一次粒径500nm)
G-2:IXEPLAS-A2(Zr,Mg,Al系イオン捕捉剤、東亜合成株式会社製、一次粒径200nm)
G-3:IXEPLAS-A3(IXEPLAS-Alの表面処理タイプ、東亜合成株式会社製)
G-4:DHT-4A-2(Mg,Al系イオン捕捉剤、協和化学工業株式会社製)
なお、上記のイオン捕捉剤は微粉砕処理を施してD95を5μm未満に調整したものを使用した。
表1に示す材料を表1に示す組成比(表1の数値は不揮発分量を意味する。)で混合した組成物を得た後、離型処理されたPET(ポリエチレンテレフタレート)フィルムの上に磁場を掛けながら塗工し、有機溶媒等を70℃で5分間熱風乾燥することによって、各成分を含有する組成物からなる組成物層をそれぞれ得た。組成物層は、乾燥後の厚さがそれぞれ3~4μmとなるように塗工した。その後、組成物層に対してそれぞれ光照射することによって(UV照射:メタルハライドランプ、積算光量:1800~2300mJ/cm2)、導電粒子が分散した第1の接着剤層を作製した。ここでの厚さは接触式厚み計を用いて測定した。
表2に示す材料を表2に示す組成比(表2の数値は不揮発分量を意味する。)で混合した組成物を得た後、離型処理されたPET(ポリエチレンテレフタレート)フィルムの上に塗工し、有機溶媒等を70℃で5分間熱風乾燥することによって、各成分を含有する組成物からなる第2の組成物層をそれぞれ作製した。組成物層は、乾燥後の厚さがそれぞれ8~9μmとなるように塗工した。ここでの厚さは接触式厚み計を用いて測定した。
[接着剤フィルムの作製]
上記で作製した第1の接着剤層及び第2の接着剤層を用いて、表3に示す構成の接着剤フィルムを作製した。例えば、実施例1の接着剤フィルムにおいては、組成物S-1によって形成した第2の接着剤層に、組成物P-1によって形成した第1の接着剤層を50~60℃の温度をかけながら張り合わせて、実施例1の接着剤フィルムを得た。実施例2~4及び比較例1~2の接着剤フィルムについては、実施例1と同様にして、表3に示す構成の接着剤フィルムを作製した。
<回路接続構造体-1の作製>
第1の回路部材として、バンプ電極を2列で千鳥状に配列したICチップ(0.9mm×20.3mm、厚さ:0.3mm、バンプ電極の大きさ:70μm×12μm、バンプ電極間スペース:12μm、バンプ電極厚さ:9μm)を準備した。また、第2の回路部材として、ポリイミド基板(東レ・デュポン株式会社製、200H)(38mm×28mm、厚さ:0.05mm)の表面に、Ti:50nm/Al:400nmの配線パターン(パターン幅:17μm、電極間スペース:7μm)を形成したものを準備した。
第1の回路部材として、バンプ電極を2列で千鳥状に配列したICチップ(0.9mm×20.3mm、厚さ:0.3mm、バンプ電極の大きさ:70μm×12μm、バンプ電極間スペース:12μm、バンプ電極厚さ:9μm)を準備した。また、第2の回路部材として、ガラス基板(コーニング社製、#1737、38mm×28mm、厚さ:0.05mm)の表面に、ITOの配線パターン(パターン幅:19μm、電極間スペース:5μm)を形成したものを準備した。
作製した回路接続構造体-1について、初期の接続抵抗(導通抵抗)を4端子法によって測定した。測定には、ETAC社製のマルチメータMLR21を用いた。電位差を任意の14点で測定し、その平均値を求めた。電位差の平均値を接続抵抗値に換算し、下記の基準で評価した。結果を表3に示す。
A:接続抵抗値が1.0Ω未満
B:接続抵抗値が1.0Ω以上
作製した回路接続構造体-2について、高温高湿試験(温度85℃及び湿度85%RHの条件で500時間保管)後、配線パターンに50Vの電圧を印加し、計1440か所の回路電極間の絶縁抵抗を一括で測定した。この測定を20サンプルについて行い、全20サンプル中、絶縁抵抗値が109Ω以上となるサンプルの個数を確認した。得られた個数から下記基準に従って絶縁抵抗を評価した。結果を表3に示す。
A:20個の絶縁抵抗値が109Ω以上
B:19~17個の絶縁抵抗値が109Ω以上
C:16~13個の絶縁抵抗値が109Ω以上
Claims (17)
- 導電粒子を含む回路接続用接着剤フィルムであって、
前記接着剤フィルムは、フィルムの厚さ方向において、カチオン重合性化合物と、熱カチオン重合開始剤と、イオン捕捉剤と、を含有する領域Aを含み、
前記カチオン重合性化合物が、分子中に開環重合性の環状エーテル基を1個以上有する化合物を含み、
前記熱カチオン重合開始剤が、アニリニウム塩を含み、
前記イオン捕捉剤が、水酸化アルミニウム、酸化アルミニウム、水酸化マグネシウム、酸化マグネシウム、水酸化ジルコニウム、酸化ジルコニウム、水酸化ビスマス、酸化ビスマス、水酸化カルシウム、酸化カルシウム、水酸化錫、酸化錫、水酸化マンガン、酸化マンガン、水酸化アンチモン、酸化アンチモン、水酸化ケイ素、酸化ケイ素、水酸化チタン及び酸化チタンからなる群より選ばれる少なくとも一種の金属化合物を含む、回路接続用接着剤フィルム。 - 前記導電粒子がパラジウムめっきを有する、請求項1に記載の回路接続用接着剤フィルム。
- 前記アニリニウム塩が、構成元素としてホウ素を含むアニオンを有するアニリニウム塩である、請求項1又は2に記載の回路接続用接着剤フィルム。
- 前記導電粒子がフィルムの一方の面側に偏在している、請求項1~3のいずれか一項に記載の回路接続用接着剤フィルム。
- 前記領域Aが、フィルムの厚さ方向において、光硬化性樹脂成分の硬化物を更に含有する領域Pを含み、
前記領域Pに前記導電粒子が分散している、請求項1~4のいずれか一項に記載の回路接続用接着剤フィルム。 - 導電粒子、光硬化性樹脂成分の硬化物、及び第1の熱硬化性樹脂成分を含有する第1の接着剤層と、第1の接着剤層上に設けられた、第2の熱硬化性樹脂成分を含有する第2の接着剤層とを備え、
前記第1の接着剤層及び前記第2の接着剤層のうちの一方又は両方が、イオン捕捉剤を更に含有し、
前記第1の熱硬化性樹脂成分及び前記第2の熱硬化性樹脂成分のうちの一方又は両方が、カチオン重合性化合物と、熱カチオン重合開始剤と、を含有し、
前記カチオン重合性化合物が、分子中に開環重合性の環状エーテル基を1個以上有する化合物を含み、
前記熱カチオン重合開始剤が、アニリニウム塩を含み、
前記イオン捕捉剤が、水酸化アルミニウム、酸化アルミニウム、水酸化マグネシウム、酸化マグネシウム、水酸化ジルコニウム、酸化ジルコニウム、水酸化ビスマス、酸化ビスマス、水酸化カルシウム、酸化カルシウム、水酸化錫、酸化錫、水酸化マンガン、酸化マンガン、水酸化アンチモン、酸化アンチモン、水酸化ケイ素、酸化ケイ素、水酸化チタン及び酸化チタンからなる群より選ばれる少なくとも一種の金属化合物を含む、回路接続用接着剤フィルム。 - 前記導電粒子がパラジウムめっきを有する、請求項6に記載の回路接続用接着剤フィルム。
- 前記アニリニウム塩が、構成元素としてホウ素を含むアニオンを有するアニリニウム塩である、請求項6又は7に記載の回路接続用接着剤フィルム。
- カチオン重合性化合物と、熱カチオン重合開始剤と、イオン捕捉剤と、を含有し、
前記カチオン重合性化合物が、分子中に開環重合性の環状エーテル基を1個以上有する化合物を含み、
前記熱カチオン重合開始剤が、アニリニウム塩を含み、
前記イオン捕捉剤が、水酸化アルミニウム、酸化アルミニウム、水酸化マグネシウム、酸化マグネシウム、水酸化ジルコニウム、酸化ジルコニウム、水酸化ビスマス、酸化ビスマス、水酸化カルシウム、酸化カルシウム、水酸化錫、酸化錫、水酸化マンガン、酸化マンガン、水酸化アンチモン、酸化アンチモン、水酸化ケイ素、酸化ケイ素、水酸化チタン及び酸化チタンからなる群より選ばれる少なくとも一種の金属化合物を含む、回路接続用接着剤組成物。 - 前記アニリニウム塩が、構成元素としてホウ素を含むアニオンを有するアニリニウム塩である、請求項9に記載の回路接続用接着剤組成物。
- 導電粒子を更に含有する、請求項9又は10に記載の回路接続用接着剤組成物。
- 前記導電粒子がパラジウムめっきを有する、請求項11に記載の回路接続用接着剤組成物。
- 光硬化性樹脂成分を更に含有する、請求項11又は12に記載の回路接続用接着剤組成物。
- 第1の電極を有する第1の回路部材と、第2の電極を有する第2の回路部材との間に、請求項1~8のいずれか一項に記載の回路接続用接着剤フィルムを介在させ、前記第1の回路部材及び前記第2の回路部材を熱圧着して、前記第1の電極及び前記第2の電極を互いに電気的に接続する工程を備える、回路接続構造体の製造方法。
- 前記第1の回路部材及び前記第2の回路部材のうちの一方がICチップであり、他方がTiを含む電極を有するプラスチック基板である、請求項14に記載の回路接続構造体の製造方法。
- 第1の電極を有する第1の回路部材と、
第2の電極を有する第2の回路部材と、
前記第1の回路部材及び前記第2の回路部材の間に配置され、前記第1の電極及び前記第2の電極を互いに電気的に接続する回路接続部と、
を備え、
前記回路接続部が、請求項1~8のいずれか一項に記載の回路接続用接着剤フィルムの硬化物を含む、回路接続構造体。 - 前記第1の回路部材及び前記第2の回路部材のうちの一方がICチップであり、他方がTiを含む電極を有するプラスチック基板である、請求項16に記載の回路接続構造体。
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