WO2020162068A1 - 表面処理銅箔、並びに、それを用いた銅張積層板、樹脂付銅箔および回路基板 - Google Patents
表面処理銅箔、並びに、それを用いた銅張積層板、樹脂付銅箔および回路基板 Download PDFInfo
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- WO2020162068A1 WO2020162068A1 PCT/JP2019/050697 JP2019050697W WO2020162068A1 WO 2020162068 A1 WO2020162068 A1 WO 2020162068A1 JP 2019050697 W JP2019050697 W JP 2019050697W WO 2020162068 A1 WO2020162068 A1 WO 2020162068A1
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- 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
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/38—Improvement of the adhesion between the insulating substrate and the metal
- H05K3/382—Improvement of the adhesion between the insulating substrate and the metal by special treatment of the metal
- H05K3/384—Improvement of the adhesion between the insulating substrate and the metal by special treatment of the metal by plating
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- 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
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- 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
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- 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
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/60—Electroplating characterised by the structure or texture of the layers
- C25D5/605—Surface topography of the layers, e.g. rough, dendritic or nodular layers
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- 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
- C25D7/0614—Strips or foils
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D9/00—Electrolytic coating other than with metals
- C25D9/04—Electrolytic coating other than with metals with inorganic materials
- C25D9/08—Electrolytic coating other than with metals with inorganic materials by cathodic processes
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- 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
- H05K1/09—Use of materials for the conductive, e.g. metallic pattern
-
- 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
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- 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
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- 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
- C25D3/56—Electroplating: Baths therefor from solutions of alloys
- C25D3/562—Electroplating: Baths therefor from solutions of alloys containing more than 50% by weight of iron or nickel or cobalt
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- 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
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/03—Conductive materials
- H05K2201/0332—Structure of the conductor
- H05K2201/0335—Layered conductors or foils
- H05K2201/0338—Layered conductor, e.g. layered metal substrate, layered finish layer, layered thin film adhesion layer
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- 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
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/03—Conductive materials
- H05K2201/0332—Structure of the conductor
- H05K2201/0335—Layered conductors or foils
- H05K2201/0355—Metal 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
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/02—Apparatus or processes for manufacturing printed circuits in which the conductive material is applied to the surface of the insulating support and is thereafter removed from such areas of the surface which are not intended for current conducting or shielding
- H05K3/022—Processes for manufacturing precursors of printed circuits, i.e. copper-clad substrates
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- 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
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/38—Improvement of the adhesion between the insulating substrate and the metal
- H05K3/389—Improvement of the adhesion between the insulating substrate and the metal by the use of a coupling agent, e.g. silane
Definitions
- the present invention relates to a surface-treated copper foil, a copper-clad laminate using the same, a resin-coated copper foil, and a circuit board.
- metal foils especially copper foils, are used as conductors in high-speed signal transmission boards that support high frequencies, but in the future, 5G and WiGig (Wireless Gigabit) will use signals with even higher frequencies than the present. And so on. Therefore, it is required to further reduce the transmission loss of the substrate.
- 5G and WiGig Wireless Gigabit
- Patent Document 1 As a surface-treated copper foil for forming high-frequency signal transmission circuits, electricity does not flow because the roughening treatment layer that affects transmission characteristics is composed of a non-conductive copper composite compound instead of conventional metallic copper. Thus, it has been reported that the conductor loss due to the roughening treatment is reduced (Patent Document 1).
- Patent Document 1 has a problem that it is particularly inferior in heat resistance because it does not perform barrier treatment or chromate treatment.
- Patent Document 2 has a problem that it is difficult to secure heat resistance in a high temperature range (for example, 150° C. or higher) because the processing amount of the metal treatment layer functioning as a barrier treatment layer is small. ..
- the present invention has been made in view of the above circumstances, and is capable of reducing the transmission loss of a high-speed signal transmission board, and has a practically satisfactory level of adhesion to a resin substrate and heat resistance. It is an object of the present invention to provide a surface-treated copper foil that can be secured by the method, a copper-clad laminate using the same, a resin-coated copper foil, and a circuit board.
- the surface-treated copper foil according to one aspect of the present invention is a surface-treated copper foil having a copper fine-roughened particle treatment layer on at least one surface of the copper foil, the fine-roughened particle treatment layer having a particle diameter of 40.
- a silane coupling agent-treated layer is provided on the anticorrosion-treated layer, and the amount of nickel deposited in the heat-resistant treated layer is 30 to 60 mg/m 2 .
- FIG. 1 is a schematic sectional view showing the structure of a surface-treated copper foil according to an embodiment of the present invention.
- the surface-treated copper foil according to the present embodiment is a surface-treated copper foil having a copper fine-roughened particle treatment layer 2 on at least one surface of a copper foil 1, as shown in FIG.
- the particle treatment layer 2 is composed of fine copper particles having a particle diameter of 40 to 200 nm
- the heat treatment layer 3 containing nickel is provided on the fine roughened particle treatment layer 2
- at least chromium is provided on the heat treatment layer 3.
- a silane coupling agent treatment layer 5 on the rust prevention treatment layer, and the amount of nickel deposited in the heat resistance treatment layer is 30 to 60 mg/m 2 . It is characterized by
- the adhesion to the resin base material is increased by providing the finely-roughened particle treatment layer composed of the finely-roughened particles on the surface of the untreated copper foil, and the size of the finely-roughened particles is further.
- the amount of nickel deposited in the heat-resistant treatment layer both the transmission characteristics and the basic characteristics (adhesion with the resin substrate and heat resistance) can be achieved.
- the present invention it is possible to reduce the transmission loss of the high-speed signal transmission board, and the adhesion with the resin base material, and particularly the surface-treated copper foil capable of ensuring heat resistance at a practically no problem level, Further, it is possible to provide a copper clad laminate using the same, a resin-coated copper foil, and a circuit board.
- the copper foil used for the rigid board or the like is generally an electrolytic copper foil
- the copper foil used for the flexible board or the like is generally a rolled copper foil, but in recent years, especially with the rise of the flexible board market, Electrolytic copper foils having characteristics comparable to rolled copper foils have been developed, and currently rolled copper foils and electrolytic copper foils are used regardless of the type of substrate. Therefore, the untreated copper foil used in this embodiment is not limited to the rolled copper foil or the electrolytic copper foil, and any copper foil may be used.
- the micro-roughened particle treatment layer is a first surface treatment layer formed on the untreated copper foil, and is a layer provided to increase the surface area and improve the peel strength from the resin base material. It is composed of fine copper particles having a particle diameter of 40 to 200 nm.
- the above particle size is used in the following meaning. That is, using a field emission scanning electron microscope FE-SEM (JSM-7800F manufactured by JEOL Ltd.), the sample stage was observed at a magnification of 80,000 while tilting the sample stage by 40°, and the height of the observed copper particles was measured as particles. The value of the diameter.
- the particle diameter of the fine copper particles in the finely-roughened particle treatment layer of the present embodiment is 200 nm at the maximum value and 40 nm at the minimum value in the range observed and measured by the above method.
- the fine copper particle treatment layer in the present embodiment does not exclude the inclusion of copper particles having a particle diameter of more than 200 nm or less than 40 nm. However, if the number of particles exceeds 200 nm is large, the transmission loss may increase, and if the number of particles less than 40 nm is large, sufficient adhesion may not be ensured, which is not preferable.
- the fine-roughened particle treatment layer can be formed by an electrolytic plating method.
- the particle size of the fine copper particles of this embodiment is strongly influenced by the electrolytic composition and the bath composition of the plating process.
- the electrolytic current density when the electrolytic current density is high, the particle diameter of the roughened particles tends to be small, and conversely, when the electrolytic current density is low, the particle diameter of the roughened particles tends to be large. Therefore, in order to obtain the roughened particles having the target particle diameter, the electrolytic current density must be set appropriately.
- bath compositions and electrolysis conditions for forming a copper fine-roughened particle treatment layer are examples of bath compositions and electrolysis conditions for forming a copper fine-roughened particle treatment layer, but the present invention is not particularly limited thereto.
- Copper sulfate pentahydrate 10 to 70 g/L (particularly preferably 30 to 50 g/L)
- Diethylenetriamine pentaacetic acid pentasodium (hereinafter DTPA/5Na): 50 to 150 g/L (particularly preferably 80 to 120 g/L) pH: 3.0 to 6.0 (particularly preferably 3.5 to 5.5)
- DTPA/5Na Diethylenetriamine pentaacetic acid pentasodium
- a suitable DTPA/5Na concentration is 50 to 150 g/L, but outside this range, if it is less than 50 g/L, it is difficult to obtain a sufficient refining effect and the roughened particles become coarse. If it exceeds 150 g/L, the current efficiency is lowered, the precipitation amount of the roughening treatment is extremely reduced, and the voltage is further increased, which is uneconomical.
- the amount of electricity is preferably 10 to 130 A ⁇ sec/dm 2 , and in this range, there is an advantage that copper particles having a particle diameter of 40 to 200 nm can be obtained and the adhesion to the resin can be easily secured.
- the quantity of electricity is less than 10 A ⁇ sec/dm 2
- the copper particles having a particle diameter of less than 40 nm increase, and the adhesion may deteriorate.
- it is more than 130 A ⁇ sec/dm 2 the particle shape is likely to be dendritic and the particle size is likely to be coarsened, resulting in low adhesion to the untreated copper foil and more powder falling off. This causes problems such as an increase in the surface roughness of the laminated surface.
- the heat resistant treatment layer is a layer for heat resistance and rust prevention that is provided to protect the copper foil including the finely grained particle treatment layer from stress such as chemicals and heat, and is also called a barrier treatment layer.
- the heat resistant treatment layer of the present embodiment contains nickel or nickel and phosphorus, and the amount of nickel deposited in the heat resistant treatment layer is 30 to 60 mg/m 2 .
- both the transmission characteristic and the basic characteristic can be achieved. If the amount of nickel adhered is less than 30 mg/m 2 , heat resistance decreases, and for example, swelling may occur at the interface between the resin and the copper foil, resulting in a decrease in adhesion, and if it exceeds 60 mg/m 2. , The transmission loss may increase. A more preferable range of the amount of nickel deposited is 40 to 50 mg/m 2 .
- the “adhesion amount” refers to the mass per unit area of nickel deposited by plating (for example, electrolytic plating method) on the side of the copper foil on which the finely-roughened particles are treated. Further, the amount of adhesion can be measured by a method of dissolving and diluting a copper foil to be treated with nitric acid or the like and analyzing the nickel concentration using an ICP emission spectroscopic analyzer.
- the heat-resistant treatment layer of this embodiment is preferably composed of nickel or nickel and phosphorus.
- the heat resistant treatment layer of the present embodiment is a second surface treatment layer formed after forming the above-mentioned fine roughened particle treatment layer, and can be formed by an electrolytic plating method.
- the amount of nickel deposited can be adjusted depending on the current conditions when performing this electrolytic plating.
- bath compositions and electrolysis conditions for forming the heat-resistant treatment layer of the present embodiment which is composed of nickel and phosphorus, but are not particularly limited thereto.
- Nickel composition Nickel sulfate hexahydrate 10 to 100 g/L (particularly preferably 20 to 60 g/L) Sodium acetate trihydrate 2-40 g/L (preferably 5-30 g/L) Sodium hypophosphite monohydrate 0.1 to 10 g/L (particularly preferably 1.0 to 6.0 g/L) pH 3.0 to 5.5 (particularly preferably 3.5 to 5.0).
- nickel sulfate hexahydrate nickel chloride hexahydrate, nickel acetate tetrahydrate, etc.
- Sodium phosphite, sodium hypophosphite, nickel phosphite and the like can be used as the source of phosphorus ions. Further, sodium sulfate may be added to impart conductivity.
- the anticorrosion treatment layer is a layer provided to prevent oxidation during heating or storage.
- the anticorrosion treatment layer of the present embodiment contains at least chromium and is sometimes referred to as a chromate treatment layer. Further, it may contain zinc.
- the anticorrosion treatment layer of the present embodiment is a third surface treatment layer formed after forming the above heat-resistant treatment layer, and can be formed by an electrolytic plating method.
- the bath composition for forming the anticorrosive layer of the present embodiment may be a known bath composition, and examples thereof include bath compositions having hexavalent chromium such as chromic acid, sodium dichromate, and potassium dichromate.
- the chromium precipitation form after the formation of the anticorrosion treatment layer is a state in which Cr(OH) 3 and Cr 2 O 3 are mixed, and there is no hexavalent chromium that adversely affects the human body, and precipitation occurs in the form of trivalent chromium.
- the chromic acid solution may be alkaline or acidic.
- an alkaline zinc chromate solution containing zinc ions and hexavalent chromium ions described in Japanese Patent Publication No. 58-15950 may be used. It is possible to improve the rustproofing property compared to the rustproofing layer.
- the electrolytic bath and the electrolytic conditions for applying the rust preventive treatment layer of the present embodiment include, for example, the following bath compositions and conditions, but are not particularly limited thereto.
- the silane coupling agent treatment layer of the present embodiment is a surface treatment layer of the fourth layer formed after forming the anticorrosion treatment layer, a layer provided to further improve the adhesion to the resin substrate. Is. Further, by providing a silane coupling agent-treated layer, not only the peel strength can be improved, but also the deterioration of the peel strength after the harsh test can be suppressed, and the rust prevention property can be further improved, which is excellent. It is a versatile copper foil for circuit boards.
- the silane coupling agent-treated layer of the present embodiment can be formed by adding an appropriate amount of a silane coupling agent to water or the like, applying the solution as an aqueous solution by dipping or spraying, and then washing and drying.
- the silane coupling agent may be selected from various types such as epoxy group, amino group, mercapto group, vinyl group, methacryloxy group and styryl group, and used. However, since they have different properties and are compatible with the base material, it is necessary to appropriately select and use them.
- the bath for forming the silane coupling agent treatment layer for example, the following composition and conditions are listed, but the bath is not particularly limited thereto.
- ⁇ -aminopropyltriethoxysilane 1 to 5 mL/L (particularly preferably 2 to 4 mL/L)
- Liquid temperature 25 to 35°C (particularly preferably 28 to 32°C)
- Immersion time 15 seconds.
- the copper-clad laminate of the present embodiment is characterized by including an insulating layer made of a cured product of a resin composition and the above-mentioned copper foil on one side or both sides of the insulating layer. With such a configuration, it is possible to provide a highly reliable copper-clad laminate having heat resistance and reduced transmission loss.
- a cured product of a resin composition refers to a resin that is in a state of not being melted even when heated due to the progress of curing reaction and crosslinking of the resin.
- the semi-cured product of the resin composition is a state in which the resin composition is partially cured to the extent that it can be further cured. That is, the semi-cured product is a semi-cured resin composition (B-staged).
- B-staged a semi-cured resin composition
- the insulating layer included in the copper-clad laminate of the present embodiment is made of a cured product of the resin composition described below. Further, the insulating layer may include a glass base material described later. The thickness of the insulating layer is not particularly limited, but is about 20 to 800 ⁇ m.
- the resin composition constituting the insulating layer of the present embodiment is not particularly limited as long as it is a resin composition containing a thermosetting resin and/or a thermoplastic resin.
- a thermosetting resin an epoxy resin, a low molecular weight polyphenylene ether resin, a cyanate ester resin, a phenol resin, a benzoxazine, a resin having an acid anhydride or an unsaturated group (acryl, methacryl, allyl, styryl, butadiene, Maleimide and the like) can be used alone or as a copolymer.
- thermoplastic resin examples include polyphenylene ether resin, polyphenylene sulfide resin, liquid crystal polymer, polyethylene resin, polystyrene resin, polytetrafluoroethylene resin, cycloolefin polymer, cycloolefin copolymer and the like.
- the above resins may be used alone or in combination of two or more.
- a resin that can obtain a low dielectric constant, low dielectric loss tangent, and high heat resistance in the cured product or the semi-cured product.
- the resin composition as described above is usually prepared into a varnish and used as a resin varnish in many cases.
- a resin varnish is prepared, for example, as follows.
- thermosetting resin the thermosetting curing agent, and if necessary, various components that can be dissolved in the organic solvent, such as various additives, are put into the organic solvent and dissolved. At this time, you may heat as needed. Thereafter, if necessary, a component that is not dissolved in an organic solvent, an inorganic filler or the like is added, and the mixture is dispersed using a ball mill, a bead mill, a planetary mixer, a roll mill, or the like until a predetermined dispersion state is obtained. A resin composition having a shape of a circle is prepared.
- the organic solvent used here is not particularly limited as long as it dissolves a thermosetting resin or a thermosetting curing agent and does not inhibit the curing reaction. Specific examples include toluene, methyl ethyl ketone, cyclohexanone and propylene glycol monomethyl ether acetate. These may be used alone or in combination of two or more.
- the insulating layer of the present embodiment preferably further contains a glass substrate in addition to the cured product of the resin composition.
- the insulating layer of the present embodiment includes a glass base material
- it may be used as a prepreg obtained by impregnating the glass base material with the above resin composition.
- the method of producing such a prepreg include a method of impregnating a glass base material with the above-mentioned resin varnish (a resin composition prepared in the form of a varnish) and then drying.
- Impregnation of the resin varnish into the glass substrate is performed by dipping and coating. This impregnation can be repeated multiple times if necessary. At this time, it is also possible to repeat the impregnation using a plurality of resin varnishes having different compositions and concentrations to finally prepare a desired composition and resin amount.
- a semi-cured (B stage) prepreg can be obtained by heating a glass substrate impregnated with a resin varnish under desired heating conditions, for example, at 80 to 170°C for 1 to 10 minutes.
- Copper-clad laminate of the present embodiment for example, one or a plurality of prepregs containing the thermosetting resin composition as described above are stacked, and further copper foil as described above on both upper and lower surfaces or one surface of the prepreg, By laminating the silane coupling agent-treated layer so as to be in contact with the prepreg, and heat-pressing and molding the layers to integrally laminate them, a double-sided copper foil-clad or single-sided copper foil-clad laminate can be produced.
- the heating and pressing conditions can be appropriately set depending on the thickness of the laminated plate to be manufactured, the type of the resin composition, and the like.
- the temperature is 170 to 220° C.
- the pressure is 1.5 to 5.0 MPa
- the time is 60. It can be up to 150 minutes.
- the resin-coated copper foil of this embodiment has a structure in which a resin layer containing a resin composition or a semi-cured product of the resin composition and a copper foil provided on one surface of the resin layer are laminated. That is, the resin-coated copper foil of the present embodiment may be a resin-coated copper foil including a resin layer containing a resin composition before curing (A-stage resin composition) and a copper foil, or a resin composition. A resin-coated copper foil including a resin layer containing a semi-cured product (B-stage resin composition) and a copper foil may be used.
- the resin composition and the copper foil used for the resin layer the same ones as those described for the copper clad laminate can be used.
- the resin composition or a semi-cured product thereof may be the resin composition dried or heated and dried.
- the resin varnish obtained above is applied to the surface of the copper foil on which the silane coupling agent-treated layer is formed, and then dried to semi-cure the resin composition. And the like.
- the resin layer of the resin-coated copper foil usually does not include a glass substrate, application of the resin varnish to the copper foil is performed by coating or the like, but it can be repeated a plurality of times as necessary. is there. Further, at this time, it is possible to repeat the application using a plurality of resin varnishes having different compositions and concentrations to finally prepare a desired composition (content ratio) and resin amount.
- the resin layer (A stage) containing the resin composition before curing is heated under desired heating conditions, for example, at 80 to 170° C. for 1 to 10 minutes, or A semi-cured resin layer (B stage) is obtained.
- the organic solvent can be volatilized from the varnish by heating to reduce or remove the organic solvent.
- the resin-coated copper foil of this embodiment also has the same effects and advantages as the above-mentioned copper-clad laminate.
- the copper clad laminate and the resin-coated copper foil of the present embodiment can be used as a circuit board having a conductor pattern as a circuit on the surface by etching the surface copper foil to form a circuit.
- a method of forming a circuit in addition to the method described above, for example, a circuit formation by a semi-additive method (SAP: Semi Additive Process) or a modified semi-additive method (MSAP: Modified Semi-Additive Process) can be mentioned.
- SAP Semi Additive Process
- MSAP Modified Semi-Additive Process
- the surface-treated copper foil according to one aspect of the present invention is a surface-treated copper foil having a copper fine-roughened particle treatment layer on at least one surface of the copper foil, the fine-roughened particle treatment layer having a particle diameter of 40.
- a silane coupling agent layer is provided on the anticorrosion treatment layer, and the amount of nickel deposited in the heat resistant treatment layer is 30 to 60 mg/m 2 .
- the heat-resistant treatment layer is composed of nickel or nickel and phosphorus. As a result, the effects as described above can be obtained more reliably.
- a copper clad laminate according to another aspect of the present invention is characterized by including an insulating layer made of a cured product of a resin composition and the above-mentioned surface-treated copper foil on one side or both sides of the insulating layer.
- a resin-coated copper foil according to a further aspect of the present invention comprises a resin layer containing a resin composition or a semi-cured product of the resin composition, and a surface-treated copper foil described above on one surface of the resin layer. Characterize.
- the present invention also includes a circuit board including the copper clad laminate or the resin-coated copper foil, and having a conductor pattern as a circuit on the surface thereof.
- Untreated copper foil> As the untreated copper foils of Examples and Comparative Examples, an electrolytic copper foil or a rolled copper foil having a thickness of 18 ⁇ m was used. When an untreated rolled copper foil is used, it is immersed in a hydrocarbon organic solvent for 60 seconds, washed with water to remove the rolling oil, and then surface-treated.
- Example 1 ⁇ Creation of surface treated copper foil> (Example 1) As a pretreatment, a copper plate is used as a cathode and the above-mentioned untreated copper foil is used as an anode in 100 g/L sulfuric acid aqueous solution, electrolysis is performed for 6 seconds at a current density of 5 A/dm 2 , and an oxide layer on the surface of the untreated copper foil is removed and activated. I went.
- a copper fine-roughened particle treatment layer was formed on the laminate surface side of the untreated copper foil by treating it with the bath composition and electrolysis conditions shown below.
- the obtained micro-roughened particle treatment layer was observed with a field emission scanning electron microscope FE-SEM (JSM-7800F manufactured by JEOL Ltd.) at a magnification of 80,000 while tilting the sample stage by 40°.
- the height of the copper particles observed as a result was used as the value of the particle diameter, and the particle diameter of the roughened particles in the fine roughened particle treatment layer was a minimum value of 40 nm and a maximum value of 200 nm.
- a heat-resistant treatment layer which is the second surface treatment layer, was formed by treating it with the bath composition and electrolysis conditions shown below.
- the amount of nickel deposited on the obtained heat-resistant treated layer was measured by dissolving and diluting the treated copper foil with nitric acid and analyzing the concentration of nickel with an ICP emission spectroscopic analyzer. As a result, the amount of deposited nickel was 32 mg/m 2 .
- the rust-preventive treatment layer which is the third surface treatment layer, was treated with the following electrolytic bath composition, pH, and electrolysis conditions.
- a silane coupling agent-treated layer to be the fourth layer surface-treated layer is formed by treatment with the bath composition, liquid temperature, and immersion time shown below to form the surface-treated copper foil of Example 1. Obtained.
- Example 2 A surface-treated copper foil of Example 2 was obtained in the same manner as in Example 1, except that the second heat-resistant treatment layer was formed by treating under the bath composition and electrolysis conditions shown below.
- the nickel adhesion amount in the obtained heat resistant treatment layer was 56 mg/m 2 .
- Comparative Example 1 A surface-treated copper foil of Comparative Example 1 was obtained in the same manner as in Example 1 except that the second heat-resistant treatment layer was not provided. The amount of nickel deposited on the obtained surface-treated copper foil was 0 mg/m 2 .
- Comparative example 2 A surface-treated copper foil of Comparative Example 2 was obtained in the same manner as in Example 1 except that the second heat-resistant treatment layer was formed by treating under the bath composition and electrolysis conditions shown below. The amount of nickel deposited on the obtained heat-resistant treatment layer was 82 mg/m 2 .
- Comparative example 3 A surface-treated copper foil of Comparative Example 3 was obtained in the same manner as in Example 1 except that the second heat-resistant treatment layer was formed by treatment under the bath composition and electrolysis conditions shown below. The amount of nickel deposited on the obtained heat-resistant treatment layer was 106 mg/m 2 .
- Comparative Example 4 A surface-treated copper foil of Comparative Example 4 was obtained in the same manner as in Example 1 except that the first layer of finely-roughened particle-treated layer was formed by treating under the bath composition and electrolysis conditions shown below.
- the particle diameter of the roughened particles in the obtained fine roughened particle-treated layer was 700 nm in the minimum value and 1400 nm in the maximum value.
- the amount of nickel deposited on the obtained heat resistant treatment layer was 32 mg/m 2 .
- Electrolysis conditions After electrolyzing in the bath (1) under the electrolysis conditions of a current density of 50 A/dm 2 , an electric quantity of 130 A ⁇ sec/dm 2 , and a liquid temperature of 30° C., fine copper particles are attached, and then in the bath (2).
- a fine roughened particle treatment layer was formed by electrolysis under a current density of 5 A/dm 2 , an electric quantity of 400 A ⁇ sec/dm 2 , and a liquid temperature of 40° C. for electrolysis.
- Comparative Example 5 Comparative Example 5 was performed in the same manner as in Example 1 except that the second heat-resistant treatment layer was formed by treating under the bath composition and electrolysis conditions shown below, and no rust-prevention treatment layer was formed. The surface-treated copper foil of was obtained. The amount of nickel deposited on the obtained heat-resistant treatment layer was 42 mg/m 2 .
- Table 1 shows the above test results.
- Comparative Example 4 in which the copper particle size in the finely-roughened particle treatment layer was large, the transmission characteristics were inferior and the heat resistance was not sufficient. Even in Comparative Example 5 in which the rustproof layer was not formed, sufficient heat resistance could not be obtained.
- the present invention has a wide range of industrial applicability in the technical field of electronic materials for transmission boards (circuit boards) and various devices using the same.
Abstract
Description
本実施形態に係る表面処理銅箔は、図1に示すように、銅箔1の少なくとも一方の面に銅の微細粗化粒子処理層2を有する表面処理銅箔であって、前記微細粗化粒子処理層2が粒子径40~200nmの微細銅粒子で構成されており、前記微細粗化粒子処理層2上にニッケルを含む耐熱処理層3を有し、前記耐熱処理層3上に少なくともクロムを含む防錆処理層4を有し、前記防錆処理層上にシランカップリング剤処理層5を有し、かつ、前記耐熱処理層中のニッケル付着量が、30~60mg/m2であることを特徴とする。
従来、リジット基板等に使用される銅箔は電解銅箔、フレキシブル基板等に使用される銅箔は圧延銅箔というのが一般的であったが、近年、特にフレキシブル基板市場の隆盛に伴い、圧延銅箔並みの特性を有する電解銅箔が開発されており、現在は、基板の種類によらず圧延銅箔や電解銅箔が使用されている。このため、本実施形態で使用する未処理銅箔は、圧延銅箔または電解銅箔に限定することは無く、何れの銅箔を使用しても良い。
微細粗化粒子処理層は、上記未処理銅箔の上に形成される一層目の表面処理層であって、表面積を増やし、樹脂基材との引き剥がし強さを向上させるために設ける層であり、粒子径40~200nmの微細銅粒子で構成されている。
硫酸銅五水和物:10~70g/L(特に好ましくは30~50g/L)
ジエチレントリアミン五酢酸五ナトリウム(以下DTPA・5Na):
50~150g/L(特に好ましくは80~120g/L)
pH:3.0~6.0(特に好ましくは3.5~5.5)
pHの調製は硫酸及び水酸化ナトリウムを使用
電流密度:0.5~10.0A/dm2(特に好ましくは1.0~6.0A/dm2)
電気量:10~130A・sec/dm2(特に好ましくは30~110A・sec/dm2)
液温:25~50℃(特に好ましくは30~45℃)
陽極:銅板。
耐熱処理層は、薬液や熱などのストレスから微細粗化粒子処理層を含めた銅箔を保護するために設けられる耐熱・防錆のための層であり、バリア処理層と呼ばれることもある。本実施形態の耐熱処理層はニッケルまたはニッケルとリンとを含み、かつ、耐熱処理層中のニッケル付着量は30~60mg/m2である。
硫酸ニッケル六水和物 10~100g/L(特に好ましくは20~60g/L)
酢酸ナトリウム三水和物 2~40g/L(特に好ましくは5~30g/L)
次亜リン酸ナトリウム一水和物 0.1~10g/L(特に好ましくは1.0~6.0g/L)
pH 3.0~5.5(特に好ましくは3.5~5.0)。
電流密度:0.5~3.5A/dm2(特に好ましくは1.0~2.0A/dm2)
電気量:1.8~2.7A・sec/dm2(特に好ましくは2.0~2.5A・sec/dm2)
液温:25~50℃(特に好ましくは30~40℃)
陽極:白金族酸化物被覆チタン等の不溶性電極。
防錆処理層は、加熱時や保管時の酸化を防ぐために設けられる層である。本実施形態の防錆処理層は、少なくともクロムを含み、クロメート処理層と呼ばれることもある。さらに、亜鉛を含んでいてもよい。
重クロム酸ナトリウム:2.5~60g/L(特に好ましくは5~30g/L)
亜鉛イオン:0.25~16g/L(特に好ましくは0.5~8g/L)
水酸化ナトリウム:10~180g/L(特に好ましくは20~90g/L)
電流密度:1.5~8.0A/dm2(特に好ましくは3.0~4.0A/dm2)
電気量:4.5~6.5A・sec/dm2(特に好ましくは5.0~6.0A・sec/dm2)
液温:25~50℃(特に好ましくは30~40℃)
陽極:白金族酸化物被覆チタン等の不溶性電極。
本実施形態のシランカップリング剤処理層は、上記の防錆処理層を形成した後に形成する四層目の表面処理層であり、樹脂基材との密着性をより向上させるために設けられる層である。さらにシランカップリング剤処理層を設けることにより、引き剥がし強さを向上させるのみならず、過酷試験後の引き剥がし強さの劣化も抑制する事ができ、更に防錆性も向上させ、優れた汎用性を備えた回路基板用銅箔となる。
γ-アミノプロピルトリエトキシシラン:1~5mL/L(特に好ましくは2~4mL/L)
液温:25~35℃(特に好ましくは28~32℃)
浸漬時間:15秒。
本実施形態の銅張積層板は、樹脂組成物の硬化物からなる絶縁層と、前記絶縁層の片面又は両面に上述した銅箔と、を備えることを特徴とする。このような構成により、耐熱性を備えつつ、伝送損失が低減された、信頼性の高い銅張積層板を提供することができる。
本実施形態の銅張積層板が備える絶縁層は、下記で説明する樹脂組成物の硬化物からなる。さらに、絶縁層が後述するガラス基材を含んでいてもよい。絶縁層の厚みは、特に限定されないが、20~800μm程度である。
本実施形態の銅張積層板は、例えば、上述したような熱硬化性樹脂組成物を含むプリプレグを一枚または複数枚重ね、さらにその上下の両面又は片面に上述したような銅箔を、前記シランカップリング剤処理層がプリプレグと接するようにして重ね、これを加熱加圧成形して積層一体化することによって、両面銅箔張り又は片面銅箔張りの積層板を作製することができる。
本実施形態の樹脂付銅箔は、樹脂組成物又は前記樹脂組成物の半硬化物を含む樹脂層と、その樹脂層の片面に設けられた銅箔とが積層されている構成を有する。すなわち、本実施形態の樹脂付銅箔は、硬化前の樹脂組成物(Aステージの樹脂組成物)を含む樹脂層と、銅箔とを備える樹脂付銅箔であってもよいし、樹脂組成物の半硬化物(Bステージの樹脂組成物)を含む樹脂層と、銅箔とを備える樹脂付銅箔であってもよい。
本実施形態の銅張積層板および樹脂付銅箔は、表面の銅箔をエッチング加工等して回路形成をすることによって、表面に回路として導体パターンを設けた回路基板として使用することができる。回路形成する方法としては、上記記載の方法以外に、例えば、セミアディティブ法(SAP:Semi Additive Process)やモディファイドセミアディティブ法(MSAP:Modified Semi Additive Process)による回路形成等が挙げられる。本実施形態の銅張積層板および樹脂付銅箔を用いて得られる回路基板は、耐熱性を備えつつ、伝送損失が低減された、信頼性の高い回路基板である。
実施例及び比較例の未処理銅箔として、厚さ18μmの電解銅箔または圧延銅箔を用いた。なお、未処理圧延銅箔を用いる場合は、炭化水素系有機溶剤に60秒間浸漬、水洗して圧延油の除去を行ったのちに表面処理を行った。
(実施例1)
前処理として、100g/L硫酸水溶液中で陰極に銅板、陽極に上記未処理銅箔を使用し電流密度5A/dm2で6秒間電解を行い、未処理銅箔表面の酸化層除去及び活性化を行った。
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
pH4.8
電流密度:6A/dm2
電気量:50A・sec/dm2
液温:30℃
電極:銅板。
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
次亜リン酸ナトリウム一水和物 2.0g/L
pH4.5
電流密度:1.0A/dm2
電気量:1.8A・sec/dm2
液温:32℃
電極:白金族酸化物被覆チタン板。
重クロム酸ナトリウム:10g/L
亜鉛イオン:1.0g/L
水酸化ナトリウム:40g/L
液温:30℃
電流密度:4A/dm2
電気量:5.5A・sec/dm2
陽極:白金族酸化物被覆チタン板。
γ-アミノプロピルトリエトキシシラン 2mL/L
液温:30℃
浸漬時間:15秒。
二層目の耐熱処理層を、以下に示す浴組成、電解条件で処理することで形成させた以外は、実施例1と同様にして、実施例2の表面処理銅箔を得た。得られた耐熱処理層におけるニッケル付着量は56mg/m2であった。
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
次亜リン酸ナトリウム一水和物 2.0g/L
電流密度:1.6A/dm2
電気量:2.7A・sec/dm2
pH4.5
液温:32℃
陽極:白金族酸化物被覆チタン板。
二層目の耐熱処理層を設けなかったこと以外は、実施例1と同様にして、比較例1の表面処理銅箔を得た。得られた表面処理銅箔におけるニッケル付着量は0mg/m2であった。
二層目の耐熱処理層を、以下に示す浴組成、電解条件で処理することで形成させた以外は、実施例1と同様にして、比較例2の表面処理銅箔を得た。得られた耐熱処理層におけるニッケル付着量は82mg/m2であった。
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
次亜リン酸ナトリウム一水和物 2.0g/L
電流密度:2.1A/dm2
電気量:3.6A・sec/dm2
pH4.5
液温:32℃
陽極:白金族酸化物被覆チタン板。
二層目の耐熱処理層を、以下に示す浴組成、電解条件で処理することで形成させた以外は、実施例1と同様にして、比較例3の表面処理銅箔を得た。得られた耐熱処理層におけるニッケル付着量は106mg/m2であった。
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
次亜リン酸ナトリウム一水和物 2.0g/L
電流密度:2.8A/dm2
電気量:4.9A・sec/dm2
pH4.5
液温:32℃
陽極:白金族酸化物被覆チタン板。
一層目の微細粗化粒子処理層を、以下に示す浴組成、電解条件で処理することで形成させた以外は、実施例1と同様にして、比較例4の表面処理銅箔を得た。得られた微細粗化粒子処理層における粗化粒子の粒子径は、最小値700nm、最大値1400nmであった。また、得られた耐熱処理層におけるニッケル付着量は32mg/m2であった。
浴(1) 硫酸銅五水和物 47g/L
硫酸100g/L
浴(2) 硫酸銅五水和物 200g/L
硫酸100g/L
浴(1)にて電流密度50A/dm2、電気量130A・sec/dm2、液温30℃の電解条件にて電解して微細銅粒子を付着させた後、さらに浴(2)にて電流密度5A/dm2、電気量400A・sec/dm2、液温40℃の電解条件にて電解することで微細粗化粒子処理層を形成した。
二層目の耐熱処理層を、以下に示す浴組成、電解条件で処理することで形成させ、さらに防錆処理層を形成しなかったこと以外は、実施例1と同様にして、比較例5の表面処理銅箔を得た。得られた耐熱処理層におけるニッケル付着量は42mg/m2であった。
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
次亜リン酸ナトリウム一水和物 2.0g/L
電流密度:1.3A/dm2
電気量:2.3A・sec/dm2
pH4.5
液温:32℃
陽極:白金族酸化物被覆チタン板。
(伝送特性試験用基板作製)
プリプレグ(パナソニック製、メグトロン6「R-5670N」、#1078タイプ)を2枚重ねて積層し、それぞれ実施例および比較例に示す銅箔を両面に重ねて、温度200℃、2時間、圧力3MPaの条件で加熱加圧することにより、150μmの厚みの評価用銅張積層板を得た。次に、得られた両面板の片面を線幅100~200μmで加工した後、加工面を挟むようにさらにプリプレグ2枚を2次積層し、3層板を作製した。線幅は仕上がり後、回路の特性インピーダンスが50Ωとなるように調製した。
プリプレグ(パナソニック製、メグトロン6「R-5670N」、#2116タイプ)を6枚重ねて積層し、それぞれ上記で得られた各実施例および各比較例の表面処理銅箔を両面に重ねて、温度200℃、2時間、圧力3MPaの条件で加熱加圧することにより、0.8mmの厚みの評価用銅張積層板を得た。
上記のように調製されたそれぞれの評価積層板を、以下に示す方法により評価を行った。
各実施例および比較例の表面処理銅箔を用いて得られた評価用積層板について、伝送特性はネットワークアナライザー(キーサイトテクノロジー社製 N5230A)を用いて通過損失を評価した。なお、評価周波数は20GHzであった。
得られた銅箔張積層板を用いて、JIS C 6481に準じて作製した試験片を、250℃、260℃、280℃、及び300℃に設定した空気循環装置付き恒温槽中で1時間処理したときに、試験片5枚中全て異常がなかったものを「○」、試験片5枚中1枚以上のサンプルにおいて「ふくれ」又は「はがれ」が生じたものを「×」と判定した。本試験においては、280℃で「○」の評価を得たサンプルを合格とする。
Claims (5)
- 銅箔の少なくとも一方の面に銅の微細粗化粒子処理層を有する表面処理銅箔であって、
前記微細粗化粒子処理層が粒子径40~200nmの微細銅粒子で構成されており、
前記微細粗化粒子処理層上にニッケルを含む耐熱処理層を有し、
前記耐熱処理層上に少なくともクロムを含む防錆処理層を有し、
前記防錆処理層上にシランカップリング剤処理層を有し、かつ、
前記耐熱処理層中のニッケル付着量が30~60mg/m2である、
表面処理銅箔。 - 前記耐熱処理層がニッケルまたはニッケルとリンとで構成されている、請求項1に記載の表面処理銅箔。
- 樹脂組成物の硬化物からなる絶縁層と、前記絶縁層の片面又は両面に請求項1または2に記載の表面処理銅箔とを備える銅張積層板。
- 樹脂組成物又は前記樹脂組成物の半硬化物を含む樹脂層と、前記樹脂層の片面に請求項1または2に記載の表面処理銅箔とを備える樹脂付銅箔。
- 請求項3に記載の銅張積層板または請求項4に記載の樹脂付銅箔を備え、その表面に回路としての導体パターンとを有する、回路基板。
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US17/426,310 US11770904B2 (en) | 2019-02-04 | 2019-12-24 | Surface-treated copper foil, and copper-clad laminate plate, resin-attached copper foil and circuit board each using same |
KR1020217026458A KR20210123327A (ko) | 2019-02-04 | 2019-12-24 | 표면 처리 구리박, 및 그것을 이용한 구리 클래드 적층판, 수지 부가 구리박 및 회로 기판 |
JP2020571036A JP7325000B2 (ja) | 2019-02-04 | 2019-12-24 | 表面処理銅箔、並びに、それを用いた銅張積層板、樹脂付銅箔および回路基板 |
CN201980090502.9A CN113383117A (zh) | 2019-02-04 | 2019-12-24 | 表面处理铜箔、以及使用该表面处理铜箔的覆铜箔层压板、带树脂的铜箔和电路板 |
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JP2015061934A (ja) * | 2013-08-20 | 2015-04-02 | Jx日鉱日石金属株式会社 | 表面処理銅箔及びそれを用いた積層板、キャリア付銅箔、プリント配線板、電子機器、並びに、プリント配線板の製造方法 |
JP2018090906A (ja) * | 2016-12-06 | 2018-06-14 | Jx金属株式会社 | 表面処理銅箔、キャリア付銅箔、積層体、プリント配線板の製造方法及び電子機器の製造方法 |
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CN107109663B (zh) | 2014-12-05 | 2020-03-10 | 纳美仕有限公司 | 高频信号传输电路形成用表面处理铜箔、覆铜层压板及印刷线路板 |
JP6182584B2 (ja) | 2015-12-09 | 2017-08-16 | 古河電気工業株式会社 | プリント配線板用表面処理銅箔、プリント配線板用銅張積層板及びプリント配線板 |
JP2017193778A (ja) | 2016-04-15 | 2017-10-26 | Jx金属株式会社 | 銅箔、高周波回路用銅箔、キャリア付銅箔、高周波回路用キャリア付銅箔、積層体、プリント配線板の製造方法及び電子機器の製造方法 |
TWI652163B (zh) * | 2017-11-15 | 2019-03-01 | 財團法人工業技術研究院 | 高頻電路用銅箔及其製造方法 |
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