WO2022215330A1 - 表面処理銅箔及び該表面処理銅箔を用いた銅張積層板並びにプリント配線板 - Google Patents
表面処理銅箔及び該表面処理銅箔を用いた銅張積層板並びにプリント配線板 Download PDFInfo
- Publication number
- WO2022215330A1 WO2022215330A1 PCT/JP2022/003721 JP2022003721W WO2022215330A1 WO 2022215330 A1 WO2022215330 A1 WO 2022215330A1 JP 2022003721 W JP2022003721 W JP 2022003721W WO 2022215330 A1 WO2022215330 A1 WO 2022215330A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- copper foil
- treated
- layer
- surface area
- treated copper
- Prior art date
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 200
- 239000011889 copper foil Substances 0.000 title claims abstract description 170
- 239000011347 resin Substances 0.000 claims abstract description 75
- 229920005989 resin Polymers 0.000 claims abstract description 75
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 54
- 239000000463 material Substances 0.000 claims abstract description 34
- 229910052802 copper Inorganic materials 0.000 claims abstract description 30
- 239000010949 copper Substances 0.000 claims abstract description 30
- 239000002245 particle Substances 0.000 claims abstract description 29
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 27
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 16
- 239000011574 phosphorus Substances 0.000 claims abstract description 16
- 239000011164 primary particle Substances 0.000 claims abstract description 10
- 238000001179 sorption measurement Methods 0.000 claims abstract description 10
- 229910052743 krypton Inorganic materials 0.000 claims abstract description 9
- DNNSSWSSYDEUBZ-UHFFFAOYSA-N krypton atom Chemical compound [Kr] DNNSSWSSYDEUBZ-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000004438 BET method Methods 0.000 claims abstract description 7
- 239000000758 substrate Substances 0.000 claims description 36
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 claims description 25
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 23
- 239000010410 layer Substances 0.000 abstract description 157
- 230000005540 biological transmission Effects 0.000 abstract description 18
- 239000011229 interlayer Substances 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 12
- 238000004873 anchoring Methods 0.000 abstract description 8
- 230000008054 signal transmission Effects 0.000 abstract description 7
- 230000001747 exhibiting effect Effects 0.000 abstract 1
- 238000000926 separation method Methods 0.000 abstract 1
- 238000005868 electrolysis reaction Methods 0.000 description 43
- 230000005611 electricity Effects 0.000 description 37
- 230000000052 comparative effect Effects 0.000 description 34
- 239000008151 electrolyte solution Substances 0.000 description 30
- 238000007788 roughening Methods 0.000 description 27
- 239000007864 aqueous solution Substances 0.000 description 26
- 239000007788 liquid Substances 0.000 description 24
- 238000012360 testing method Methods 0.000 description 21
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 20
- 238000003780 insertion Methods 0.000 description 18
- 230000037431 insertion Effects 0.000 description 18
- 238000005530 etching Methods 0.000 description 17
- 238000000034 method Methods 0.000 description 12
- 239000010936 titanium Substances 0.000 description 11
- 229910052719 titanium Inorganic materials 0.000 description 11
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 10
- 229910001924 platinum group oxide Inorganic materials 0.000 description 9
- 239000007789 gas Substances 0.000 description 8
- JZCCFEFSEZPSOG-UHFFFAOYSA-L copper(II) sulfate pentahydrate Chemical compound O.O.O.O.O.[Cu+2].[O-]S([O-])(=O)=O JZCCFEFSEZPSOG-UHFFFAOYSA-L 0.000 description 7
- -1 diethylenetriamine compound Chemical class 0.000 description 7
- 238000011156 evaluation Methods 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 238000004381 surface treatment Methods 0.000 description 7
- BDKLKNJTMLIAFE-UHFFFAOYSA-N 2-(3-fluorophenyl)-1,3-oxazole-4-carbaldehyde Chemical compound FC1=CC=CC(C=2OC=C(C=O)N=2)=C1 BDKLKNJTMLIAFE-UHFFFAOYSA-N 0.000 description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- HFTNNOZFRQLFQB-UHFFFAOYSA-N ethenoxy(trimethyl)silane Chemical compound C[Si](C)(C)OC=C HFTNNOZFRQLFQB-UHFFFAOYSA-N 0.000 description 6
- 238000000465 moulding Methods 0.000 description 6
- RRIWRJBSCGCBID-UHFFFAOYSA-L nickel sulfate hexahydrate Chemical compound O.O.O.O.O.O.[Ni+2].[O-]S([O-])(=O)=O RRIWRJBSCGCBID-UHFFFAOYSA-L 0.000 description 6
- 229940116202 nickel sulfate hexahydrate Drugs 0.000 description 6
- 229920001955 polyphenylene ether Polymers 0.000 description 6
- 235000017281 sodium acetate Nutrition 0.000 description 6
- 229940087562 sodium acetate trihydrate Drugs 0.000 description 6
- 239000012298 atmosphere Substances 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 5
- 239000003792 electrolyte Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 238000007747 plating Methods 0.000 description 5
- 230000008961 swelling Effects 0.000 description 5
- 238000001878 scanning electron micrograph Methods 0.000 description 4
- KOUDKOMXLMXFKX-UHFFFAOYSA-N sodium oxido(oxo)phosphanium hydrate Chemical compound O.[Na+].[O-][PH+]=O KOUDKOMXLMXFKX-UHFFFAOYSA-N 0.000 description 4
- 230000003746 surface roughness Effects 0.000 description 4
- PTFCDOFLOPIGGS-UHFFFAOYSA-N Zinc dication Chemical compound [Zn+2] PTFCDOFLOPIGGS-UHFFFAOYSA-N 0.000 description 3
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 3
- 239000004020 conductor Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 239000012466 permeate Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- WYTZZXDRDKSJID-UHFFFAOYSA-N (3-aminopropyl)triethoxysilane Chemical compound CCO[Si](OCC)(OCC)CCCN WYTZZXDRDKSJID-UHFFFAOYSA-N 0.000 description 2
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- 229920000106 Liquid crystal polymer Polymers 0.000 description 2
- 239000004977 Liquid-crystal polymers (LCPs) Substances 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 125000003277 amino group Chemical group 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000005238 degreasing Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000002500 effect on skin Effects 0.000 description 2
- 125000003700 epoxy group Chemical group 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- QELJHCBNGDEXLD-UHFFFAOYSA-N nickel zinc Chemical compound [Ni].[Zn] QELJHCBNGDEXLD-UHFFFAOYSA-N 0.000 description 2
- LQPLDXQVILYOOL-UHFFFAOYSA-I pentasodium;2-[bis[2-[bis(carboxylatomethyl)amino]ethyl]amino]acetate Chemical compound [Na+].[Na+].[Na+].[Na+].[Na+].[O-]C(=O)CN(CC([O-])=O)CCN(CC(=O)[O-])CCN(CC([O-])=O)CC([O-])=O LQPLDXQVILYOOL-UHFFFAOYSA-I 0.000 description 2
- ACVYVLVWPXVTIT-UHFFFAOYSA-M phosphinate Chemical compound [O-][PH2]=O ACVYVLVWPXVTIT-UHFFFAOYSA-M 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 229920001721 polyimide Polymers 0.000 description 2
- 239000009719 polyimide resin Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 239000010731 rolling oil Substances 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- JYEUMXHLPRZUAT-UHFFFAOYSA-N 1,2,3-triazine Chemical compound C1=CN=NN=C1 JYEUMXHLPRZUAT-UHFFFAOYSA-N 0.000 description 1
- XQUPVDVFXZDTLT-UHFFFAOYSA-N 1-[4-[[4-(2,5-dioxopyrrol-1-yl)phenyl]methyl]phenyl]pyrrole-2,5-dione Chemical compound O=C1C=CC(=O)N1C(C=C1)=CC=C1CC1=CC=C(N2C(C=CC2=O)=O)C=C1 XQUPVDVFXZDTLT-UHFFFAOYSA-N 0.000 description 1
- AZUYLZMQTIKGSC-UHFFFAOYSA-N 1-[6-[4-(5-chloro-6-methyl-1H-indazol-4-yl)-5-methyl-3-(1-methylindazol-5-yl)pyrazol-1-yl]-2-azaspiro[3.3]heptan-2-yl]prop-2-en-1-one Chemical compound ClC=1C(=C2C=NNC2=CC=1C)C=1C(=NN(C=1C)C1CC2(CN(C2)C(C=C)=O)C1)C=1C=C2C=NN(C2=CC=1)C AZUYLZMQTIKGSC-UHFFFAOYSA-N 0.000 description 1
- KWSLGOVYXMQPPX-UHFFFAOYSA-N 5-[3-(trifluoromethyl)phenyl]-2h-tetrazole Chemical compound FC(F)(F)C1=CC=CC(C2=NNN=N2)=C1 KWSLGOVYXMQPPX-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 241000694440 Colpidium aqueous Species 0.000 description 1
- 229920000089 Cyclic olefin copolymer Polymers 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- YJHPAGMBPHQKCG-UHFFFAOYSA-N [Ni++].OP([O-])[O-] Chemical compound [Ni++].OP([O-])[O-] YJHPAGMBPHQKCG-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 125000001951 carbamoylamino group Chemical group C(N)(=O)N* 0.000 description 1
- MEYVLGVRTYSQHI-UHFFFAOYSA-L cobalt(2+) sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Co+2].[O-]S([O-])(=O)=O MEYVLGVRTYSQHI-UHFFFAOYSA-L 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- ORTQZVOHEJQUHG-UHFFFAOYSA-L copper(II) chloride Chemical compound Cl[Cu]Cl ORTQZVOHEJQUHG-UHFFFAOYSA-L 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 210000001787 dendrite Anatomy 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- IIRVGTWONXBBAW-UHFFFAOYSA-M disodium;dioxido(oxo)phosphanium Chemical compound [Na+].[Na+].[O-][P+]([O-])=O IIRVGTWONXBBAW-UHFFFAOYSA-M 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 125000005395 methacrylic acid group Chemical group 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229940078487 nickel acetate tetrahydrate Drugs 0.000 description 1
- LAIZPRYFQUWUBN-UHFFFAOYSA-L nickel chloride hexahydrate Chemical compound O.O.O.O.O.O.[Cl-].[Cl-].[Ni+2] LAIZPRYFQUWUBN-UHFFFAOYSA-L 0.000 description 1
- OINIXPNQKAZCRL-UHFFFAOYSA-L nickel(2+);diacetate;tetrahydrate Chemical compound O.O.O.O.[Ni+2].CC([O-])=O.CC([O-])=O OINIXPNQKAZCRL-UHFFFAOYSA-L 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 229920003192 poly(bis maleimide) Polymers 0.000 description 1
- 239000002952 polymeric resin Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 description 1
- 229910001379 sodium hypophosphite Inorganic materials 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- RWVGQQGBQSJDQV-UHFFFAOYSA-M sodium;3-[[4-[(e)-[4-(4-ethoxyanilino)phenyl]-[4-[ethyl-[(3-sulfonatophenyl)methyl]azaniumylidene]-2-methylcyclohexa-2,5-dien-1-ylidene]methyl]-n-ethyl-3-methylanilino]methyl]benzenesulfonate Chemical compound [Na+].C1=CC(OCC)=CC=C1NC1=CC=C(C(=C2C(=CC(C=C2)=[N+](CC)CC=2C=C(C=CC=2)S([O-])(=O)=O)C)C=2C(=CC(=CC=2)N(CC)CC=2C=C(C=CC=2)S([O-])(=O)=O)C)C=C1 RWVGQQGBQSJDQV-UHFFFAOYSA-M 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 125000005504 styryl group Chemical group 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 125000003396 thiol group Chemical group [H]S* 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/12—Electroplating: Baths therefor from solutions of nickel or cobalt
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/38—Electroplating: Baths therefor from solutions of copper
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/10—Electroplating with more than one layer of the same or of different metals
- C25D5/12—Electroplating with more than one layer of the same or of different metals at least one layer being of nickel or chromium
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/16—Electroplating with layers of varying thickness
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/18—Electroplating using modulated, pulsed or reversing current
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/48—After-treatment of electroplated surfaces
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D7/00—Electroplating characterised by the article coated
- C25D7/06—Wires; Strips; Foils
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/03—Use of materials for the substrate
Definitions
- the present invention relates to a surface-treated copper foil that can be suitably used for printed wiring boards for high frequency signal transmission.
- the treated surface of the surface-treated copper foil has a three-dimensional shape consisting of a plurality of continuous fine copper particles, and has a high surface area ratio per 1 m 2 of two-dimensional area and is excellent in anchoring effect. It exhibits high adhesion even to low-dielectric resin substrates, and since it has a heat-resistant layer containing dissimilar metals, nickel and phosphorus, the copper particles are less likely to be oxidized even when exposed to high temperatures for a long period of time.
- the present invention relates to a surface-treated copper foil capable of producing a multilayer printed wiring board having excellent interlayer adhesion since substrates can be adhered to each other.
- the transmission characteristics of the signal transmitted through the circuit can be represented by S parameters.
- S21 the degree of signal loss between terminals caused by attenuation
- the insertion loss (S21) is represented by the following [Equation 1], where P in is the input power, P out is the output power, and the unit is dB (decibel).
- the insertion loss must be suppressed to -3.0 dB or more, that is, the signal loss must be suppressed to 50% or less.
- the signal loss increases as the frequency increases, so the absolute value of the insertion loss increases.
- Low dielectric resin substrates include polyphenylene ether resins, liquid crystal polymer resins, and fluorine resins.
- Low-dielectric resin substrates often use resins that have a molecular structure that is less polar and less prone to oriented polarization. , it becomes difficult to obtain chemical adhesion.
- the conductor resistance of the copper foil it is possible to reduce the surface roughness of the untreated copper foil, which is the base material of the surface-treated copper foil, or to increase the physical adhesion (anchor effect) with the insulating resin base material. ) can be reduced by reducing the amount of roughening treatment, and furthermore, the amount of metal treatment can be reduced to improve heat resistance.
- the depth of the transmitted signal becomes shallower, making it easier for the signal to be transmitted near the surface. It is intended to suppress the transmission distance from becoming long.
- the copper foil of the copper-clad laminate is completely removed by etching, resulting in the exposed surface of the insulating resin substrate. , the shape of the treated surface of the copper foil is reversed and duplicated, and the convex shape on the copper foil side becomes concave on the insulating resin substrate side. Since the resin permeates into the recesses on the base material side and bonds the insulating resin substrates together to form a multi-layer structure, if the amount of roughening treatment is reduced, the unevenness is reduced, and the recesses through which the resin permeates are reduced. This is because the anchor effect is weakened.
- a surface-treated copper foil that can be suitably used for printed wiring boards for high-frequency signal transmission can suppress insertion loss during high-frequency signal transmission, and has sufficient adhesion and heat resistance to various low-dielectric resin substrates.
- a surface-treated copper foil that can be used to produce a multilayer printed wiring board that is resistant to peeling and, when multilayered, has excellent interlaminar adhesion.
- Patent Document 1 transmission loss (insertion loss) when transmitting high frequency signals is suppressed, and adhesion and durability of the interface between the insulating resin base material and the copper foil are excellent under high temperature and severe conditions.
- a surface treated copper foil is disclosed.
- the surface-treated copper foil disclosed in Patent Document 1 has a roughened particle height of 0.05 ⁇ m or more and less than 0.5 ⁇ m, and the surface area ratio of the roughened surface (ratio of three-dimensional area to two-dimensional area) is 1.2 or more, and the amount of nickel element contained in the metal treatment layer is 0.1 mg/dm 2 or more and less than 0.3 mg/dm 2 , thereby suppressing transmission loss and peeling after long-term heating. This is intended to keep the rate of strength deterioration low.
- Patent Document 1 cannot ensure sufficient adhesion and heat resistance to the insulating resin substrate when the surface area ratio is close to the lower limit. There is a possibility that the adhesion between layers cannot be ensured when the layers are multi-layered.
- the nickel content of the metal treatment layer is small, even if the surface area ratio is increased, the adhesion and heat resistance are weak in the temperature range exceeding 150 ° C., and the interface between the insulating resin base material and the copper foil swells. There are problems such as the occurrence of
- the surface area ratio of the non-roughened surface is regarded as 1, and the surface area ratio of the roughened surface is calculated by subtracting the surface area ratio of 1 from the surface area ratio of the surface-treated copper foil. Therefore, the surface area ratio (surface area ratio in the present invention) of the roughened surface and the non-roughened surface, that is, the surface-treated copper foil of both surfaces combined is 2.2 or more.
- Patent Document 2 discloses a surface-treated copper foil that can ensure sufficient adhesive strength with a low-dielectric base material and can minimize transmission loss.
- the surface-treated copper foil disclosed in Patent Document 2 forms a roughening treatment layer made of hump-shaped copper grains with a particle size of 0.5 ⁇ m to 3.0 ⁇ m on the surface of the untreated copper foil, and on the roughening treatment layer Precipitate ultrafine copper grains with a grain size of 0.1 ⁇ m to 1.0 ⁇ m on the surface, provide a rust prevention treatment layer made of zinc-nickel on the surface, and set the total amount of zinc-nickel adhesion to 20-60 mg / m 2 , By setting the surface roughness to Rz 1.0 ⁇ m to 6.5 ⁇ m, the adhesion to the low-dielectric substrate is intended to be enhanced.
- the inventors of the present invention made it a technical task to solve the above-mentioned problems, and as a result of repeated trial and error trial production and experiments, the roughening treatment layer and the above-mentioned A surface-treated copper foil comprising a heat-resistant layer on a roughening-treated layer, wherein the roughening-treated layer is a finely roughened layer made of copper particles having a primary particle diameter of 10 nm or more and 110 nm or less.
- the heat-resistant layer contains nickel and phosphorus, and the treated surface of the surface-treated copper foil has a surface area ratio of 5.0 per square meter of two -dimensional area calculated from the specific surface area measured by the krypton gas adsorption BET method.
- the surface-treated copper foil is excellent in anchoring effect, so that it exhibits high adhesion to the insulating resin substrate and low dielectric constant.
- the present inventors have achieved the above-mentioned technical problems by obtaining the remarkable knowledge that a surface-treated copper foil that can be used for the surface treatment can be obtained.
- the present invention is a surface-treated copper foil comprising a roughening treatment layer on at least one surface of an untreated copper foil and a heat-resistant treatment layer on the roughening treatment layer, wherein the roughening treatment layer has a primary particle diameter of is a finely roughened layer made of copper particles of 10 nm or more and 110 nm or less, the heat-resistant layer contains nickel and phosphorus, and the treated surface of the surface-treated copper foil is krypton gas adsorption BET method.
- the surface-treated copper foil has a surface area ratio of 5.1 or more per 1 m 2 of two-dimensional area calculated from the measured specific surface area, and a nickel adhesion amount of 2 mg or more per 1 m 2 of surface area.
- the present invention is the surface-treated copper foil, wherein the amount of nickel attached is 60 mg or less per square meter of surface area.
- the present invention is the surface-treated copper foil, wherein the adhesion amount of phosphorus is 0.1 mg or more per 1 m 2 of surface area.
- the present invention is the surface-treated copper foil, wherein the arithmetic mean height Sa of the treated surface is 0.02 ⁇ m or more and 0.35 ⁇ m or less.
- the present invention also provides the surface-treated copper foil comprising a chromate-treated layer and/or a silane coupling agent-treated layer on the heat-resistant layer.
- the present invention is a copper-clad laminate obtained by laminating the surface-treated copper foil to an insulating resin substrate.
- the present invention is also the copper-clad laminate, wherein the insulating resin base material is a low-dielectric resin base material.
- the present invention also provides a printed wiring board or a multilayer printed wiring board formed using the copper-clad laminate.
- the roughening treatment layer is composed of fine copper particles with a primary particle diameter of 10 nm to 110 nm
- the two-dimensional surface area calculated from the specific surface area measured by the krypton gas adsorption BET method
- the surface-treated copper foil achieves a high surface area ratio of 5.1 or more per 1 m 2 of area.
- the treated surface and the insulating resin base material are adhered together and subjected to heat and pressure molding, the treated surface and the surface of the insulating resin base material are brought into close contact three-dimensionally over a wide area, resulting in an excellent anchoring effect. Therefore, the surface-treated copper foil has excellent adhesion to the insulating resin substrate.
- the surface-treated copper foil of the present invention is a surface-treated copper foil that has excellent adhesion even to low-polarity, low-dielectric resin substrates because it exhibits an excellent anchoring effect.
- the shape of the treated surface is a three-dimensional shape composed of a plurality of continuous fine copper particles, it is replicated on the surface of the insulating resin substrate after removing the copper foil by etching. Since the shape also becomes a three-dimensional surface shape equivalent to the surface shape of the surface-treated copper foil, when a new insulating resin base material is laminated on the surface of the insulating resin base material after removing the copper foil, it is fine and The resin permeates into the recessed portions with a high surface area ratio, and the surface-treated copper foil exhibits an excellent anchoring effect because it adheres over a wider area. .
- the roughened layer consists of fine copper particles with a primary particle diameter of 10 nm to 110 nm, the insertion loss due to the skin effect is suppressed even when high-frequency signals are transmitted. It is a surface-treated copper foil that can produce a printed wiring board that can achieve a certain level of transmission characteristics.
- the heat-resistant layer in the present invention contains dissimilar metals of nickel and phosphorus, and the amount of nickel adhered is 2 mg or more per 1 m 2 of surface area, so the surface of the roughened particles is protected by nickel and phosphorus. Therefore, even if exposed to a high temperature of about 150 to 280 ° C. for 1 hour or more, the fine copper particles are difficult to oxidize, and the occurrence of swelling at the interface between the insulating resin base material and the copper foil can be suppressed. High heat resistance can be achieved.
- a chromate treatment layer and/or a silane coupling agent treatment layer on the heat-resistant treatment layer, even if exposed to a high temperature of about 300 ° C. for one hour or more, the interface between the insulating resin base material and the copper foil Since the occurrence of blistering can be suppressed, even higher heat resistance can be achieved.
- the surface-treated copper foil can be easily removed by soft etching.
- the surface-treated copper foil can be easily removed by soft etching.
- the surface-treated copper foil can produce a printed wiring board with excellent transmission characteristics. become.
- the surface-treated copper foil of the present invention can be suitably used for producing printed wiring boards and multilayer printed wiring boards for high-frequency signal transmission.
- FIG. 1 is a schematic diagram of the surface-treated copper foil in this invention. 200,000 and 100,000 times scanning electron micrographs of the surface-treated copper foil of Example 1 (surface area ratio 8.8). 200,000 times and 100,000 times scanning electron micrographs of the surface-treated copper foil of Example 8 (surface area ratio: 5.5). 200,000 and 100,000 times scanning electron micrographs of the surface-treated copper foil of Comparative Example 12 (surface area ratio 5.0). 200,000 and 100,000 times scanning electron micrographs of the surface-treated copper foil of Comparative Example 11 (surface area ratio 4.2). 1 is a schematic diagram of copper particles forming a finely roughened layer in the present invention. FIG.
- untreated copper foil The copper foil used in the present invention (hereinafter referred to as "untreated copper foil") is not particularly limited, and may be rolled copper foil, electrolytic copper foil, etc. can be used.
- the one side to be surface-treated is not particularly limited, and not only can the rolled copper foil be on either side, but also the electrodeposited copper foil can be either the deposition side or the drum side.
- the thickness of the untreated copper foil is not particularly limited as long as it can be used for printed wiring boards after surface treatment, but it is preferably 6 ⁇ m to 300 ⁇ m, more preferably 12 ⁇ m to 35 ⁇ m.
- Both surfaces of the untreated copper foil are measured using a confocal microscope (laser microscope) conforming to ISO 25178-607, and the arithmetic mean height Sa is 0.6 ⁇ m or less when measured according to JIS B 0681-3. It is preferably 0.3 ⁇ m or less, more preferably 0.3 ⁇ m or less.
- the surface area ratio of the untreated copper foil per 1 m 2 of two-dimensional area calculated from the specific surface area measured by the krypton gas adsorption BET method is preferably 2-4.
- the present invention is a surface-treated copper foil comprising a finely roughened layer of fine copper particles on an untreated copper foil.
- the particle diameter of the primary particles of the copper particles constituting the finely roughened layer is preferably 10 nm to 110 nm, more preferably 20 nm to 100 nm.
- the insulating resin substrate and the copper foil will separate when the copper clad laminate laminated with the insulating resin substrate is exposed to a high temperature of about 150 to 300 ° C. for 1 hour or more. There is a risk that sufficient heat resistance may not be obtained due to swelling at the interface, and after forming a printed wiring board using a copper clad laminate, when an insulating resin base material is further laminated to form a multilayer This is because there is a possibility that sufficient interlayer adhesion may not be obtained.
- the surface roughness may increase and the insertion loss may increase.
- the particle diameter is observed with a field emission scanning electron microscope at a tilt angle of 0° and a magnification of 100,000 to 200,000 times, and the longest diameter of the primary particles is measured as shown in FIG.
- the present invention is a surface-treated copper foil having a heat-resistant layer on a finely roughened layer.
- the amount of nickel attached to the heat-resistant layer is preferably 2 mg or more, more preferably 3 mg or more per square meter of surface area.
- the amount of nickel adhered is less than 2 mg, when a copper-clad laminate is formed by bonding it to an insulating resin base material, if it is exposed to a high temperature of about 150 to 300° C. for 1 hour or more, the insulating resin base material and the copper foil will be separated. This is because there is a risk that swelling will occur at the interface between and sufficient heat resistance will not be obtained.
- the amount of nickel deposited per 1 m 2 of surface area can be obtained by the following [Equation 2].
- the adhesion amount of phosphorus on the heat-resistant layer is preferably 0.1 mg or more per square meter of surface area.
- the amount of phosphorus deposited is less than 0.1 mg, even if the amount of nickel deposited is 60 mg or less, the etching time becomes long when soft etching is performed, and etching defects may occur, resulting in poor adhesion of the copper plating.
- the adhesion amount of phosphorus per 1 m 2 of surface area can be obtained by the following [Equation 3].
- the surface area ratio per 1 m 2 of two-dimensional area calculated from the specific surface area measured by the krypton gas adsorption BET method of the treated surface provided with the finely roughened layer and the heat-resistant treated layer in the present invention is 5.1 or more. It is preferably 5.5 or more, more preferably 5.5 or more.
- the surface area ratio is less than 5.1, when the copper-clad laminate laminated with the insulating resin base material is exposed to a high temperature of about 150 to 300° C. for 1 hour or more, the interface between the insulating resin base material and the copper foil This is because there is a risk that swelling will occur and sufficient heat resistance will not be obtained, and that sufficient interlayer adhesion will not be obtained when multilayered.
- the surface area ratio of the treated surface can be calculated by multiplying the krypton gas adsorption BET specific surface area measurement value by the sample mass and dividing by the sample area.
- the arithmetic mean height Sa of the treated surface provided with the finely roughened layer and the heat-resistant layer of the surface-treated copper foil of the present invention is preferably 0.02 ⁇ m to 0.35 ⁇ m, more preferably 0.02 ⁇ m to 0.15 ⁇ m. is.
- the fine roughening treatment layer is an electrolytic solution prepared by adding an aqueous solution of untreated copper foil with 10 to 70 g/L of copper sulfate pentahydrate and 50 to 150 g/L of a diethylenetriamine compound to pH 3 to 6 with sulfuric acid or sodium hydroxide. can be formed by electrolysis while being immersed in
- An insoluble electrode such as platinum group oxide-coated titanium is immersed in the electrolytic solution as an anode, and an untreated copper foil is immersed as a cathode on the opposite side at a certain interval, and the current density is 1.0 to 9.0 A / dm. 2.
- the electrolysis conditions are an amount of electricity of 40 to 90 C/dm 2 and a liquid temperature of 25 to 50°C.
- the diethylenetriamine compound added to the electrolytic solution is not particularly limited, but pentasodium diethylenetriaminepentaacetate is exemplified.
- the heat-resistant layer can be formed by electrolysis while immersing the copper foil, which has a finely roughened layer formed on the untreated copper foil, in an electrolytic solution.
- the electrolyte for forming the heat-resistant layer is an aqueous solution containing 10 to 70 g/L of a nickel-containing compound, 2 to 40 g/L of acetate, and 0.1 to 10.0 g/L of hypophosphite, pH 4.0 to Those prepared to 5.5 are preferred.
- Electrolysis is performed by immersing an insoluble electrode such as platinum-group oxide-coated titanium in an electrolytic solution as an anode, and immersing a copper foil having a finely roughened layer formed on the opposite side at a certain interval as a cathode. Electrolytic conditions of 0.5 to 3.5 A/dm 2 , an amount of electricity of 2.5 to 22 C/dm 2 and a liquid temperature of 25 to 50° C. are preferable.
- the nickel-containing compound contained in the electrolytic solution is not particularly limited, but examples include nickel sulfate hexahydrate, nickel chloride hexahydrate, and nickel acetate tetrahydrate.
- the acetate contained in the electrolyte is not particularly limited, but sodium acetate trihydrate is exemplified.
- hypophosphite contained in the electrolyte is not particularly limited, but examples include disodium hydrogen phosphite, sodium hypophosphite monohydrate, and nickel hydrogen phosphite.
- a chromate-treated layer and/or a silane coupling agent-treated layer can be provided on the heat-resistant layer.
- the chromate-treated layer can be formed by electrolysis while immersing the copper foil with the heat-resistant layer in an electrolytic solution.
- the electrolytic solution for forming the chromate treatment layer is an aqueous solution containing 10 to 60 g/L of a chromic acid-containing compound, or an aqueous solution containing 10 to 60 g/L of a chromic acid-containing compound and 0.2 to 4.0 g/L of zinc ions mixed with sulfuric acid. Alternatively, it is preferably adjusted to pH 2 to 12 with sodium hydroxide.
- Electrolysis is carried out by immersing an insoluble electrode such as platinum group oxide-coated titanium in an electrolytic solution as an anode, and immersing a copper foil with a heat-resistant layer formed on the opposite side at a certain interval as a cathode, and adjusting the current density. Electrolytic conditions of 1.0 to 5.0 A/dm 2 , an amount of electricity of 2 to 6 C/dm 2 and a liquid temperature of 25 to 50° C. are preferable.
- the chromic acid-containing compound is not particularly limited, but sodium dichromate dihydrate is exemplified.
- zinc oxide is exemplified.
- a silane coupling agent-treated layer may be provided on the chromate-treated layer or on the heat-resistant layer.
- the silane coupling agent used in the silane coupling agent layer is not particularly limited, and is a silane coupling agent containing a vinyl group, an epoxy group, a styryl group, a methacrylic group, an acrylic group, an amino group, a ureido group and a mercapto group.
- silane coupling agents containing amino groups, epoxy groups, or vinyl groups are very effective in moisture absorption resistance and rust prevention, and can be used more preferably.
- the silane coupling agent may be used alone or in combination of two or more.
- composition and conditions of the aqueous solution for forming the silane coupling agent-treated layer include ⁇ -aminopropyltriethoxysilane of 1 to 5 mL/L, liquid temperature of 25 to 35°C, and immersion time of 15 seconds.
- the insulating resin substrate to which the surface-treated copper foil is laminated in the present invention is not particularly limited, but epoxy resin, polyimide resin, and low dielectric resin substrates such as polyphenylene ether resin, liquid crystal polymer resin, fluororesin, and bismaleimide are used. Examples include triazine resins and cycloolefin polymer resins.
- the rolled copper foil was immersed in an alkaline degreasing solution to remove the rolling oil, and then subjected to each surface treatment. Further, the electrolytic copper foil was immersed in dilute sulfuric acid to remove the oxide film, and then subjected to surface treatment.
- Example 1 is an example in which a chromate-treated layer and a silane coupling agent-treated layer are provided in this order on a heat-resistant layer
- Example 1a is an example in which neither a chromate-treated layer nor a silane coupling agent-treated layer is provided
- Example 1b An example in which only the chromate-treated layer is provided is referred to as Example 1b
- Example 1c An example in which only the silane coupling agent-treated layer is provided.
- an electrolytic solution As an electrolytic solution, an aqueous solution containing 35 g/L of copper sulfate pentahydrate and 100 g/L of pentasodium diethylenetriaminepentaacetate at a pH of 4.8 and a liquid temperature of 32°C was used. An electrode is immersed as an anode, and an untreated copper foil is immersed as a cathode on the opposite side with a certain interval, and electrolysis is performed at a current density of 5.0 A/dm 2 and an amount of electricity of 60 C/dm 2 to electrolyze the untreated copper foil. A fine roughening treatment layer was provided thereon.
- An insoluble electrode of platinum group oxide-coated titanium was immersed in the electrolytic solution as an anode, and a copper foil provided with the fine roughening treatment layer was immersed as a cathode on the opposite side at a certain interval, and the current density was 2.5 A. /dm 2 and an electric quantity of 5 C/dm 2 to form a heat-resistant layer on the finely roughened layer.
- ⁇ Formation of chromate treatment layer> As an electrolytic solution, an aqueous solution containing 12.5 g/L of sodium dichromate dihydrate and 2.5 g/L of zinc ions at a pH of 12 and a liquid temperature of 25° C. was used. An insoluble electrode is immersed as an anode, and a copper foil provided with the heat-resistant layer is immersed as a cathode on the opposite side at a certain interval, and electrolysis is performed at a current density of 4.3 A/dm 2 and an electric quantity of 6 C/dm 2 . Then, a chromate-treated layer was provided on the heat-resistant layer.
- the copper foil provided with the heat-resistant layer or the copper foil provided with the chromate-treated layer is immersed in an aqueous solution containing 5 mL/L of ⁇ -aminopropyltriethoxysilane at a liquid temperature of 25 ° C. for 10 seconds, dried and heat-resistant.
- a surface-treated copper foil was produced by forming a silane coupling agent-treated layer on the layer or on the chromate-treated layer.
- Example 2 The heat-resistant layer was formed under the same conditions as in Example 1, except that the amount of electricity was set to 10 C/dm 2 for electrolysis.
- Example 3 is an example in which a chromate-treated layer and a silane coupling agent-treated layer are provided in this order on a heat-resistant layer
- Example 3a is an example in which neither a chromate-treated layer nor a silane coupling agent-treated layer is provided
- Example 3b An example in which only the chromate-treated layer is provided is referred to as Example 3b
- Example 3c An example in which only the silane coupling agent-treated layer is provided.
- the heat-resistant layer was formed under the same conditions as in Example 1 and Examples 1a to 1c, except that the amount of electricity was set to 3 C/dm 2 for electrolysis.
- Example 4 When forming the finely roughened layer, the electrolysis conditions were a current density of 7.0 A/dm 2 and an amount of electricity of 80 C/dm 2 , and when forming the heat-resistant layer, the electrolysis conditions were an amount of electricity of 3 C/dm 2 . It was produced under the same conditions as in Example 1, except for the above.
- Example 5 When forming the heat-resistant layer, the electrolysis conditions were an amount of electricity of 10 C/dm 2 , and when forming the chromate-treated layer, the electrolytic solution contained 20 g/L of sodium dichromate dihydrate, pH 4.5. It was produced under the same conditions as in Example 1, except that an aqueous solution at a temperature of 25° C. was used and the electrolysis conditions were a current density of 2.2 A/dm 2 and an amount of electricity of 3 C/dm 2 .
- Example 7 The heat-resistant layer was formed under the same conditions as in Example 1, except that the amount of electricity was set to 20 C/dm 2 for electrolysis.
- the electrolysis conditions are a current density of 4.0 A/dm 2 and the amount of electricity is 50 C/dm 2 ; when the heat-resistant layer is formed, the electrolysis condition is an amount of electricity of 10 C/dm 2 ;
- the electrolysis condition is an amount of electricity of 10 C/dm 2 ;
- an aqueous solution containing 20 g/L of sodium dichromate dihydrate at a pH of 4.5 and a liquid temperature of 25° C. was used as the electrolytic solution, and the electrolysis conditions were a current density of 2.2 A/dm 2 , It was produced under the same conditions as in Example 1, except that the amount of electricity was 3 C/dm 2 .
- the electrolytic solution was pH 4.0 containing 30 g/L of nickel sulfate hexahydrate, 0.4 g/L of sodium hypophosphite monohydrate, and 10 g/L of sodium acetate trihydrate. 5.
- an aqueous solution having a liquid temperature of 32° C. was used and the electrolysis conditions were set to an amount of electricity of 10 C/dm 2 .
- the electrolytic solution was pH 4.0 containing 30 g/L of nickel sulfate hexahydrate, 2.0 g/L of sodium hypophosphite monohydrate, and 10 g/L of sodium acetate trihydrate. 5. Prepared under the same conditions as in Example 1, except that an aqueous solution having a liquid temperature of 32° C. was used and the electrolysis conditions were set to an amount of electricity of 10 C/dm 2 .
- Example 11 When forming the chromate treatment layer, an aqueous solution containing 20 g/L of sodium dichromate dihydrate at a pH of 4.5 and a liquid temperature of 25° C. was used as the electrolytic solution, and the electrolysis conditions were a current density of 2.2 A/dm 2 , It was produced under the same conditions as in Example 1, except that the amount of electricity was 3 C/dm 2 .
- Example 12 When forming the heat-resistant layer, the electrolysis conditions were 15 C/dm 2 of electricity. It was produced under the same conditions as in Example 1, except that an aqueous solution at a temperature of 25° C. was used and the electrolysis conditions were a current density of 2.2 A/dm 2 and an amount of electricity of 3 C/dm 2 .
- Example 1 It was produced under the same conditions as in Example 1, except that the fine roughening treatment layer was not provided.
- Example 2 Fabrication was performed under the same conditions as in Example 1, except that the fine roughening treatment layer was not provided and the electrolysis condition was set to 3 C/dm 2 of electricity when the heat-resistant treatment layer was formed.
- Example 3 Fabrication was performed under the same conditions as in Example 1, except that the fine roughening treatment layer was not provided and the electrolysis condition was set to 10 C/dm 2 of electricity when the heat-resistant treatment layer was formed.
- the electrolysis condition is set to an electric quantity of 10 C/dm 2 , and when forming a chromate layer, 20 g of sodium dichromate dihydrate is added to the electrolytic solution. /L containing pH 4.5, liquid temperature 25 ° C., the electrolysis conditions were current density 2.2 A / dm 2 , the amount of electricity 3 C / dm 2 , under the same conditions as in Example 1 made.
- Example 6 Fabrication was performed under the same conditions as in Example 1, except that the fine roughening treatment layer was not provided and the electrolysis conditions were set to 20 C/dm 2 of electricity when forming the heat-resistant treatment layer.
- Example 7 Fabrication was carried out under the same conditions as in Example 1, except that the fine roughening treatment layer was not provided and the electrolysis condition was set to 6 C/dm 2 of electricity when forming the heat-resistant treatment layer.
- an aqueous solution containing 200 g/L of copper sulfate pentahydrate and 100 g/L of sulfuric acid was used as an electrolytic solution at a liquid temperature of 40°C, and an insoluble electrode made of platinum group oxide-coated titanium was immersed in the electrolytic solution as an anode,
- a copper foil provided with a dendritic particle layer on the opposite side at a certain interval is immersed as a cathode, and the dendritic particle layer is electrolyzed at a current density of 5.0 A/dm 2 and an amount of electricity of 440 C/dm 2 . It was fabricated under the same conditions as in Example 1, except that a roughening treatment layer was provided by plating copper thereon.
- an aqueous solution containing 200 g/L of copper sulfate pentahydrate and 100 g/L of sulfuric acid was used as an electrolytic solution at a liquid temperature of 40°C, and an insoluble electrode made of platinum group oxide-coated titanium was immersed in the electrolytic solution as an anode,
- a copper foil provided with a dendritic particle layer on the opposite side at a certain interval is immersed as a cathode, and the dendritic particle layer is electrolyzed at a current density of 10.0 A/dm 2 and an amount of electricity of 250 C/dm 2 . It was produced under the same conditions as in Example 1, except that a roughening treatment layer was provided by copper plating thereon.
- Example 13 The heat-resistant layer was formed under the same conditions as in Example 1, except that the electrolysis conditions were a current density of 0.5 A/dm 2 and an amount of electricity of 1.0 C/dm 2 .
- the electrolyte for forming the heat-resistant layer contains 39 g/L of cobalt sulfate heptahydrate, 24 g/L of sodium molybdate dihydrate, 45 g/L of trisodium citrate dihydrate, and 40 g/L of sodium sulfate.
- an aqueous solution with a pH of 5.6 and a liquid temperature of 30°C an insoluble electrode made of platinum group oxide-coated titanium was immersed in the electrolytic solution as an anode, and a finely roughened copper foil was placed on the opposite side with a certain interval as a cathode. It was prepared under the same conditions as in Example 1 except that a heat-resistant layer was formed on the copper foil by electrolysis at a current density of 7.0 A/dm 2 and an amount of electricity of 14 C/dm 2 .
- the electrolysis conditions were 24 C/dm 2 of electricity. It was produced under the same conditions as in Example 1, except that an aqueous solution at a temperature of 25° C. was used and the electrolysis conditions were a current density of 2.2 A/dm 2 and an amount of electricity of 3 C/dm 2 .
- the electrolysis conditions were 27 C/dm 2 of electricity. It was produced under the same conditions as in Example 1, except that an aqueous solution at a temperature of 25° C. was used and the electrolysis conditions were a current density of 2.2 A/dm 2 and an amount of electricity of 3 C/dm 2 .
- Untreated copper foil or surface-treated copper foil was evaluated by the following method.
- a measurement sample was cut so that the sample area was 0.0150 m 2 or 0.0168 m 2 , and the mass of each sample was used as the sample amount.
- the copper-clad laminate was evaluated by the following method.
- each double-sided copper-clad laminate was cut into 5 cm x 5 cm pieces, and 5 test pieces were used. Each temperature was held for 1 hour.
- test piece after the heat resistance test at each temperature was visually observed, and the number of test pieces in which peeling occurred at the interface between the resin substrate and the copper foil was counted and evaluated as follows. ⁇ : 0 test pieces peeled at a temperature of 280 ° C. or lower ⁇ : 1 to 5 test pieces peeled at a temperature of 280 ° C. or lower
- the examples and comparative examples provided with a chromate-treated layer and a silane coupling agent-treated layer were held at a temperature of 290°C for 1 hour, and the number of peeled test pieces was counted.
- the copper foil portion of the single-sided copper-clad laminate is entirely etched with a copper chloride etchant, washed with water, and dried.
- a vacuum press machine KVHC-II manufactured by Kitagawa Seiki Co., Ltd.
- heat and pressure molding was performed under the above conditions to prepare a pseudo-multilayer board.
- Each pseudo-multilayer board was cut into 5 pieces of 5 cm x 5 cm to make a test piece. held for seconds.
- a single-ended microstrip circuit was formed on the obtained double-sided copper clad laminate to obtain a test piece.
- the test piece had a circuit length of 100 mm and a circuit width of 190 ⁇ m so that the characteristic impedance was 50 ⁇ .
- test piece was measured for S parameter (S21) at a frequency of 20 GHz using a network analyzer (manufactured by Keysight Technologies/E5071C) and evaluated as follows. ⁇ : -3 dB/100 mm or more ⁇ : Less than -3 dB/100 mm
- Soft etching properties were evaluated as a removability evaluation of a copper foil surface including a finely roughened layer by simulating the surface treatment of the copper foil surface in the process of forming blind vias in a printed wiring board.
- the surface-treated copper foils of Examples 9 to 12 and Comparative Examples 15 to 17 were cut into 5 cm x 5 cm pieces, which were heated at 300°C for 100 seconds in an air atmosphere to obtain test pieces.
- an aqueous solution containing 200 mL of sulfuric acid and 25 mL/L of hydrogen peroxide and having a liquid temperature of 40° C. is used as the soft etching solution.
- the time (seconds) until the substrate (untreated copper foil) became visible was measured and evaluated as follows. ⁇ : Less than 30 seconds ⁇ : 30 seconds or more and less than 60 seconds ⁇ : 60 seconds or more and less than 120 seconds ⁇ : 120 seconds or more
- the insertion loss of the surface-treated copper foil in the present invention is -3 dB / 100 mm or more even at a high frequency of 20 GHz, which is about the same as the non-roughened foil (Comparative Examples 1 to 7).
- the copper-clad laminate using the surface-treated copper foil of the present invention has a surface with high heat resistance that does not cause peeling at the interface between the insulating resin substrate and the copper foil even when heated at a temperature of 280 ° C. for 1 hour. It was proved to be a treated copper foil.
- the surface-treated copper foil of the present invention had a soft etching time of less than 60 seconds and exhibited excellent soft etching properties.
- the roughened layer has a three-dimensional shape consisting of a plurality of continuous fine copper particles, and has a high surface area ratio per 1 m 2 of two-dimensional area and is excellent in anchoring effect. Therefore, it exhibits high adhesion even to low-polarity, low-dielectric resin substrates, and since it has a heat-resistant layer containing different metals, nickel and phosphorus, it has insulating properties even when exposed to high temperatures for a long time.
- the surface-treated copper foil is less likely to blister at the interface between the resin base material and the copper foil and is less likely to be peeled off.
- the present invention is a surface-treated copper foil that can suppress insertion loss to the same extent as a non-roughened copper foil, so that it has excellent transmission characteristics, and moreover, it is possible to adhere insulating resin substrates to each other. Therefore, a multilayer printed wiring board having excellent interlayer adhesion can be produced by making the copper foil multilayer, so that the surface-treated copper foil can be suitably used for printed wiring boards for high-frequency signal transmission. Therefore, the present invention is an invention with high industrial applicability.
Abstract
Description
しかし、前述の通り、周波数が高くなるにつれて信号損失は大きくなるので、挿入損失の絶対値が大きくなる。
本発明に使用する銅箔(以下「未処理銅箔」という)は特に限定されるものではなく、圧延銅箔や電解銅箔等、表裏の区別のない銅箔、表裏の区別のある銅箔のいずれも使用することができる。
本発明は、未処理銅箔上に微細な銅粒子からなる微細粗化処理層を備える表面処理銅箔である。
本発明は、微細粗化処理層上に耐熱処理層を備える表面処理銅箔である。
処理面の表面積比は、クリプトンガス吸着BET比表面積測定値に試料質量を乗じて試料面積で除して算出することができる。
本発明における表面処理銅箔は、耐熱処理層上にクロメート処理層及び/又はシランカップリング剤処理層を設けることができる。
本発明における表面処理銅箔を張り合わせる絶縁性樹脂基材は特に限定されないが、エポキシ樹脂やポリイミド樹脂、また、低誘電性樹脂基材として、ポリフェニレンエーテル樹脂、液晶ポリマー樹脂、フッ素樹脂、ビスマレイミドトリアジン樹脂、シクロオレフィンポリマー樹脂を例示する。
実施例および比較例の未処理銅箔として、公称厚さ12~35μmの電解銅箔又は圧延銅箔を用いた。
また、電解銅箔は、希硫酸に浸漬し、酸化被膜を除去してから表面処理を行った。
耐熱処理層上にクロメート処理層とシランカップリング剤処理層とをこの順で設けた例を実施例1、クロメート処理層とシランカップリング剤処理層をいずれも設けなかった例を実施例1a、クロメート処理層のみを設けた例を実施例1b、シランカップリング剤処理層のみを設けた例を実施例1cとする。
電解液として、硫酸銅五水和物35g/L、ジエチレントリアミン五酢酸五ナトリウム100g/Lを含有するpH4.8、液温32℃の水溶液を用い、前記電解液に白金族酸化物被覆チタンの不溶性電極を陽極として浸漬し、また、一定の間隔をあけて向かい側に未処理銅箔を陰極として浸漬し、電流密度5.0A/dm2、電気量60C/dm2で電解して未処理銅箔上に微細粗化処理層を設けた。
電解液として、硫酸ニッケル六水和物30g/L、次亜リン酸ナトリウム一水和物2.3g/L、酢酸ナトリウム三水和物10g/Lを含有するpH4.5、液温32℃の水溶液を用いた。
電解液として、二クロム酸ナトリウム二水和物12.5g/L、亜鉛イオン2.5g/Lを含有するpH12、液温25℃の水溶液を用い、前記電解液に白金族酸化物被覆チタンの不溶性電極を陽極として浸漬し、また、一定の間隔をあけて向かい側に前記耐熱処理層を設けた銅箔を陰極として浸漬し、電流密度4.3A/dm2、電気量6C/dm2で電解して耐熱処理層上にクロメート処理層を設けた。
液温25℃のγ-アミノプロピルトリエトキシシラン5mL/Lを含有する水溶液に前記耐熱処理層を設けた銅箔又は前記クロメート処理層を設けた銅箔を10秒間浸漬し、乾燥させて耐熱処理層上又はクロメート処理層上にシランカップリング剤処理層を形成して表面処理銅箔を作製した。
耐熱処理層を形成する際、電解条件を電気量10C/dm2としたこと以外は、実施例1と同一の条件で作製した。
耐熱処理層上にクロメート処理層とシランカップリング剤処理層とをこの順で設けた例を実施例3、クロメート処理層とシランカップリング剤処理層をいずれも設けなかった例を実施例3a、クロメート処理層のみを設けた例を実施例3b、シランカップリング剤処理層のみを設けた例を実施例3cとする。
微細粗化処理層を形成する際、電解条件を電流密度7.0A/dm2、電気量80C/dm2とし、また耐熱処理層を形成する際、電解条件を電気量3C/dm2としたこと以外は、実施例1と同一の条件で作製した。
耐熱処理層を形成する際、電解条件を電気量10C/dm2とし、またクロメート処理層を形成する際、電解液に二クロム酸ナトリウム二水和物20g/Lを含有するpH4.5、液温25℃の水溶液を用い、電解条件を電流密度2.2A/dm2、電気量3C/dm2としたこと以外は、実施例1と同一の条件で作製した。
耐熱処理層を形成する際、電解条件を電気量20C/dm2としたこと以外は、実施例1と同一の条件で作製した。
微細粗化処理層を形成する際、電解条件を電流密度4.0A/dm2、電気量50C/dm2とし、耐熱処理層を形成する際、電解条件を電気量10C/dm2とし、またクロメート処理層を形成する際、電解液に二クロム酸ナトリウム二水和物20g/Lを含有するpH4.5、液温25℃の水溶液を用い、電解条件を電流密度2.2A/dm2、電気量3C/dm2としたこと以外は、実施例1と同一の条件で作製した。
耐熱処理層を形成する際、電解液として、硫酸ニッケル六水和物30g/L、次亜リン酸ナトリウム一水和物0.4g/L、酢酸ナトリウム三水和物10g/Lを含むpH4.5、液温32℃の水溶液を用い、電解条件を電気量10C/dm2としたこと以外は、実施例1と同一の条件で作製した。
耐熱処理層を形成する際、電解液として、硫酸ニッケル六水和物30g/L、次亜リン酸ナトリウム一水和物2.0g/L、酢酸ナトリウム三水和物10g/Lを含むpH4.5、液温32℃の水溶液を用い、電解条件を電気量10C/dm2としたこと以外は、実施例1と同一の条件で作製した。
クロメート処理層を形成する際、電解液に二クロム酸ナトリウム二水和物20g/Lを含有するpH4.5、液温25℃の水溶液を用い、電解条件を電流密度2.2A/dm2、電気量3C/dm2としたこと以外は、実施例1と同一の条件で作製した。
耐熱処理層を形成する際、電解条件を電気量15C/dm2とし、またクロメート処理層を形成する際、電解液に二クロム酸ナトリウム二水和物20g/Lを含有するpH4.5、液温25℃の水溶液を用い、電解条件を電流密度2.2A/dm2、電気量3C/dm2としたこと以外は、実施例1と同一の条件で作製した。
微細粗化処理層を設けなかったこと以外は、実施例1と同一の条件で作製した。
微細粗化処理層を設けず、また耐熱処理層を形成する際、電解条件を電気量3C/dm2としたこと以外は、実施例1と同一の条件で作製した。
微細粗化処理層を設けず、また耐熱処理層を形成する際、電解条件を電気量10C/dm2としたこと以外は、実施例1と同一の条件で作製した。
微細粗化処理層を設けず、また耐熱処理層を形成する際、電解条件を電気量10C/dm2とし、さらにクロメート処理層を形成する際、電解液に二クロム酸ナトリウム二水和物20g/Lを含有するpH4.5、液温25℃の水溶液を用い、電解条件を電流密度2.2A/dm2、電気量3C/dm2としたこと以外は、実施例1と同一の条件で作製した。
微細粗化処理層を設けず、また耐熱処理層を形成する際、電解条件を電気量20C/dm2としたこと以外は、実施例1と同一の条件で作製した。
微細粗化処理層を設けず、また耐熱処理層を形成する際、電解条件を電気量6C/dm2としたこと以外は、実施例1と同一の条件で作製した。
特許文献1の実施例に記載された電解液(硫酸銅五水和物98g/L、硫酸180g/L、モリブデンイオン60mg/L、液温25℃)、及び、電解条件(電流密度25.0A/dm2、電気量38C/dm2)で粗化処理層を形成し、また、耐熱処理層を形成する際、電解液として、硫酸ニッケル六水和物30g/L、次亜リン酸ナトリウム一水和物2g/L、酢酸ナトリウム三水和物10g/Lを含有するpH4.5、液温32℃の水溶液を用い、電流条件を電流密度0.5A/dm2、電気量2C/dm2としたこと以外は、実施例1と同一の条件で作製した。
粗化処理層を形成する際、はじめに電解液として、硫酸銅五水和物57g/L、硫酸110g/L、タングステンイオン15mg/L、塩化物イオン30mg/Lを含む液温40℃の水溶液を用い、前記電解液の中に白金族酸化物被覆チタンの不溶性電極を陽極として浸漬し、また、一定の間隔をあけて向かい側に未処理銅箔を陰極として浸漬し、電流密度50.0A/dm2、電気量125C/dm2で電解して未処理銅箔上に樹枝状粒子層を形成した。
粗化処理層を形成する際、はじめに電解液として硫酸銅五水和物47g/L、硫酸95g/L、タングステンイオン15mg/L、チタンイオン500mg/Lを含む液温35℃の水溶液を用い、前記電解液に白金族酸化物被覆チタンの不溶性電極を陽極として浸漬し、また、一定の間隔をあけて向かい側に未処理銅箔を陰極として浸漬し、電流密度30.0A/dm2、電気量95C/dm2で電解して未処理銅箔上に樹枝状粒子層を形成した。
微細粗化処理層を形成する際、電解条件を電流密度1.3A/dm2、電気量15C/dm2とし、また耐熱処理層を形成する際、電解条件を電気量3C/dm2としたこと以外は、実施例1と同一の条件で作製した。
微細粗化処理層を形成する際、電解条件を電流密度2.5A/dm2、電気量30C/dm2とし、また耐熱処理層を形成する際、電解条件を電気量3C/dm2としたこと以外は、実施例1と同一の条件で作製した。
耐熱処理層を形成する際、電解条件を電流密度0.5A/dm2、電気量1.0C/dm2としたこと以外は、実施例1と同一の条件で作製した。
耐熱処理層を形成する電解液として、硫酸コバルト七水和物39g/L、モリブデン酸ナトリウム二水和物24g/L、クエン酸三ナトリウム二水和物45g/L、硫酸ナトリウム40g/Lを含むpH5.6、液温30℃の水溶液を用い、前記電解液に白金族酸化物被覆チタンの不溶性電極を陽極として浸漬し、また、一定の間隔をあけて向かい側に微細粗化処理銅箔を陰極として浸漬し、電流密度7.0A/dm2、電気量14C/dm2で電解して当該銅箔上に耐熱処理層を設けたこと以外は、実施例1と同一の条件で作製した。
耐熱処理層を形成する電解液として、硫酸ニッケル六水和物30g/L、酢酸ナトリウム三水和物10g/Lを含むpH4.5、液温32℃の水溶液を用い、前記電解液に白金族酸化物被覆チタンの不溶性電極を陽極として浸漬し、また、一定の間隔をあけて向かい側に微細粗化処理銅箔を陰極として浸漬し、電気量10C/dm2で電解して当該銅箔上に耐熱処理層を設けたこと以外は、実施例1と同一の条件で作製した。
耐熱処理層を形成する際、電解条件を電気量24C/dm2とし、またクロメート処理層を形成する際、電解液に二クロム酸ナトリウム二水和物20g/Lを含有するpH4.5、液温25℃の水溶液を用い、電解条件を電流密度2.2A/dm2、電気量3C/dm2としたこと以外は、実施例1と同一の条件で作製した。
耐熱処理層を形成する際、電解条件を電気量27C/dm2とし、またクロメート処理層を形成する際、電解液に二クロム酸ナトリウム二水和物20g/Lを含有するpH4.5、液温25℃の水溶液を用い、電解条件を電流密度2.2A/dm2、電気量3C/dm2としたこと以外は、実施例1と同一の条件で作製した。
実施例および比較例の各表面処理銅箔の処理面を被接着面として、1枚~6枚積層したポリフェニレンエーテル樹脂含有基材(パナソニック株式会社製/MEGTRON7/公称厚さ0.06mm)の片面又は両面に合わせ、真空熱プレス機(北川精機株式会社製/KVHC-II)を使用し、大気雰囲気下、温度200℃、面圧4MPaで80分間加熱・加圧成形を行い、銅箔積層板を得た。
ISO25178-607に準拠した共焦点顕微鏡であるレーザー顕微鏡(オリンパス株式会社製/LEXT OLS5000)を用い、JIS B 0681-3に準拠して、評価領域を125μm×125μm、Sフィルタを0.5μm、Lフィルタを50μm、F演算を多次曲面(3次)としたときの算術平均高さSaを測定した。
実施例および比較例の微細粗化処理層を設けた面について、電界放出型走査電子顕微鏡(日本電子株式会社製/JSM-7800F)を使用し、傾斜角度0°において倍率100,000~200,000倍で観察された一次粒子20点の最も長い径を計測して行った(図6)。
実施例及び比較例の各表面処理銅箔の比表面積は、ガス吸着量測定装置(マイクロトラック・ベル株式会社製/BELSORP-MaxII)を使用し、室温で5時間減圧脱気後に液体窒素温度(77K)におけるクリプトンガス吸着等温線を測定し、BET多点法により求めた。
前記BET比表面積の値に試料量を乗じ、それを試料面積で除することで算出した。
実施例および比較例の各表面処理銅箔の耐熱処理層が設けられた面について、蛍光X線分析装置(株式会社リガク製/ZSX Primus IV)により蛍光X線強度を測定し、その強度からファンダメンタル・パラメータ法により二次元面積1m2あたりのニッケル付着量を算出し、それぞれ得られた付着量、および表面積比、二次元面積(=1m2)の値を[数4]に当てはめることで算出した。
実施例及び比較例の各表面処理銅箔の耐熱処理層が設けられた面について、蛍光X線分析装置(株式会社リガク製/ZSX Primus IV)により蛍光X線強度を測定し、ファンダメンタル・パラメータ法により二次元面積1m2あたりのリン付着量を算出し、それぞれ得られた付着量、および表面積比、二次元面積(=1m2)の値を[数5]に当てはめることで算出した。
6枚積層したポリフェニレンエーテル樹脂含有基材(パナソニック株式会社製/MEGTRON7/公称厚さ0.06mm)の両面に実施例及び比較例の各表面処理銅箔の処理面を被接着面として合わせ、真空熱プレス機(北川精機株式会社製/KVHC-II)を使用し、大気雰囲気下、温度200℃、面圧4MPaで80分間加熱・加圧成形を行い、両面銅張積層板を得た。
〇:温度280℃以下において剥離した試験片の個数が0枚
×:温度280℃以下において剥離した試験片の個数が1~5枚
実施例および比較例の各表面処理銅箔の処理面を被接着面として、まず、ポリフェニレンエーテル樹脂含有基材(パナソニック株式会社製/MEGTRON7/公称厚さ0.06mm)1枚の片面に合わせ、真空熱プレス機(北川精機株式会社製/KVHC-II)を使用し、大気雰囲気下、温度200℃、面圧4MPaで80分間加熱・加圧成形を行い、片面銅張積層板を得た。
〇:0枚
×:1~5枚
実施例および比較例の各表面処理銅箔の処理面を被接着面として、ポリフェニレンエーテル樹脂含有基材(パナソニック株式会社製/MEGTRON7/公称厚さ0.06mm)1枚の両面に合わせ、真空熱プレス機(北川精機株式会社製/KVHC-II)を使用し、大気雰囲気下、温度200℃、面圧4MPaで80分間加熱・加圧成形を行い、両面銅張積層板を得た。
なお、当該試験片は回路長を100mmとし、特性インピーダンスが50Ωとなるよう回路幅を190μmとした。
〇:-3dB/100mm以上
×:-3dB/100mm未満
耐熱性試験および層間密着性試験、伝送特性の各評価を総合して、以下の通り評価した。
〇:上記試験のいずれの評価も〇であった場合
×:上記試験のうち、評価×が1つ以上あった場合
プリント配線板にブラインドビアを形成する工程における銅箔面の下地処理を模擬し、微細粗化処理層を含む銅箔表面の除去性評価としてソフトエッチング性を評価することとした。
◎:30秒未満
〇:30秒以上60秒未満
△:60秒以上120秒未満
×:120秒以上
また、本発明は、無粗化処理銅箔と同程度に挿入損失を抑制することができるため伝送特性に優れた表面処理銅箔であって、しかも絶縁性樹脂基材同士を密着させることができるので、多層化すれば、層間密着性に優れた多層プリント配線板を作製できるから、高周波信号伝送用のプリント配線板に好適に使用できる表面処理銅箔である。
したがって、本発明は産業上の利用可能性の高い発明である。
Claims (8)
- 未処理銅箔の少なくとも一方の面に粗化処理層と前記粗化処理層上に耐熱処理層を備える表面処理銅箔であって、前記粗化処理層は一次粒子の粒子径が10nm以上、かつ、110nm以下の銅粒子からなる微細粗化処理層であり、前記耐熱処理層はニッケルとリンとを含有し、前記表面処理銅箔の処理面は、クリプトンガス吸着BET法により測定した比表面積から算出される2次元面積1m2あたりの表面積比が5.1以上であり、前記ニッケルの付着量が表面積1m2あたり2mg以上である表面処理銅箔。
- 前記ニッケルの付着量が表面積1m2あたり60mg以下である、請求項1記載の表面処理銅箔。
- 前記リンの付着量が表面積1m2あたり0.1mg以上である請求項1又は2記載の表面処理銅箔。
- 前記処理面の算術平均高さSaが0.02μm以上、かつ、0.35μm以下である請求項1乃至3いずれか記載の表面処理銅箔。
- 前記耐熱処理層上にクロメート処理層及び/又はシランカップリング剤処理層を備えた請求項1乃至4いずれか記載の表面処理銅箔。
- 請求項1乃至5いずれか記載の表面処理銅箔を絶縁性樹脂基材に張り合わせてなる銅張積層板。
- 前記絶縁性樹脂基材が低誘電性樹脂基材である請求項6記載の銅張積層板。
- 請求項6又は7記載の銅張積層板を用いて形成されたプリント配線板又は多層プリント配線板。
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