WO2005120139A1 - 表面処理銅箔及びその表面処理銅箔を用いて製造したフレキシブル銅張積層板並びにフィルムキャリアテープ - Google Patents
表面処理銅箔及びその表面処理銅箔を用いて製造したフレキシブル銅張積層板並びにフィルムキャリアテープ Download PDFInfo
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- WO2005120139A1 WO2005120139A1 PCT/JP2005/010151 JP2005010151W WO2005120139A1 WO 2005120139 A1 WO2005120139 A1 WO 2005120139A1 JP 2005010151 W JP2005010151 W JP 2005010151W WO 2005120139 A1 WO2005120139 A1 WO 2005120139A1
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- copper foil
- layer
- polyimide resin
- treated
- foil
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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
- 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
- C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
-
- 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
- C25D7/00—Electroplating characterised by the article coated
- C25D7/06—Wires; Strips; Foils
- C25D7/0614—Strips or foils
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/48—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor
- H01L23/488—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor consisting of soldered or bonded constructions
- H01L23/498—Leads, i.e. metallisations or lead-frames on insulating substrates, e.g. chip carriers
- H01L23/4985—Flexible insulating substrates
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/38—Chromatising
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/30—Technical effects
- H01L2924/301—Electrical effects
- H01L2924/3011—Impedance
-
- 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
- H05K1/0313—Organic insulating material
- H05K1/032—Organic insulating material consisting of one material
- H05K1/0346—Organic insulating material consisting of one material containing N
-
- 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
- H05K2201/01—Dielectrics
- H05K2201/0137—Materials
- H05K2201/0154—Polyimide
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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
- H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
- H05K2203/07—Treatments involving liquids, e.g. plating, rinsing
- H05K2203/0703—Plating
- H05K2203/0723—Electroplating, e.g. finish plating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12431—Foil or filament smaller than 6 mils
Definitions
- the invention according to the present application mainly relates to a surface-treated copper foil.
- this surface-treated copper foil mainly relates to a surface-treated copper foil.
- a copper foil used by being bonded to a polyimide resin base material is capable of obtaining an anchor effect on the bonding surface.
- Rough treatment such as attaching fine copper particles, has been used through an adhesive layer.
- Such a flexible copper-clad laminate and a film carrier tape for TAB have a three-layer structure of a so-called copper foil layer, an adhesive layer, and a polyimide resin base material layer. It has been called film carrier tape.
- the flexible copper-clad laminate referred to in the present invention is a term used in the concept of a rigid substrate such as a glass-epoxy substrate / paper-phenol substrate, and a copper-clad laminate using a polyimide resin substrate. It is used to include all of the laminates. Therefore, in a broad sense, film carrier tapes for TAB are also used separately in the power industry, which is included in flexible copper-clad laminates.
- a general electrolytic copper foil used by being bonded to a polyimide resin base material will be described.
- the Balta copper layer which is the base of the electrolytic copper foil, is formed by flowing a copper electrolyte between a drum-shaped rotating cathode and a lead-based anode, etc., which is arranged along the shape of the rotating cathode, and performs an electrolytic reaction. Copper is deposited on the drum surface of the rotating cathode by utilizing the copper, and the deposited copper becomes a foil state, and the rotating cathode force is obtained by continuously peeling off.
- the surface of the rotating cathode which has been mirror-finished, is transferred, and has a glossy and smooth surface.
- the surface shape on the solution side, which was the deposition side is dependent on the crystal growth rate of Since the degree is different for each crystal plane, it shows a mountain-like uneven shape, which is called a rough surface.
- this rough surface is a surface to be bonded to an insulating material when manufacturing a copper-clad laminate.
- the foil that has been peeled off from the surface of the rotating cathode in this manner is not subjected to any heat-prevention treatment or the like, and thus is referred to as a deposited foil or an untreated foil (hereinafter, referred to as an “untreated foil”). Shall be decided.).
- the untreated foil is subjected to a surface roughening treatment and a surface protection treatment in a surface treatment step.
- the rough surface treatment on a rough surface is a process in which a current under a so-called scuff condition is applied in a copper sulfate solution to deposit and adhere fine copper particles to a rough mountain-like uneven shape, and immediately a current range under a smooth condition. This prevents the fine copper particles from falling off. Therefore, the rough surface on which fine copper particles are deposited and attached is referred to as "rough surface”. Then, if necessary, anti-reflection treatment and the like are performed, and an electrolytic copper foil that is distributed in the market is completed.
- Patent Document 4 discloses that when a copper foil layer is formed on the surface of a polyimide resin base material, a seed layer is formed and this seed layer is formed. A copper layer of an arbitrary thickness is electrolytically grown on the layer to form a so-called two-layer substrate.
- the inventions disclosed in Patent Document 3 and Patent Document 4 are advantageous in that control of the thickness of the copper foil layer is very easy.
- Patent Document 1 Japanese Patent Application Laid-Open No. 05-029740
- Patent Document 2 Japanese Patent Application Laid-Open No. 11-10794
- Patent Document 3 JP-A-2000-43188
- Patent Document 4 Japanese Patent Application Laid-Open No. 2002-252257
- the electrolytic copper foil with a carrier foil disclosed in Patent Document 3 is advantageous in that the copper foil layer is made thinner, but is subjected to the same roughening treatment and anti-corrosion treatment as a normal copper foil. . Therefore, even if the electrolytic copper foil with a carrier foil is directly bonded to a polyimide resin base material to form a two-layer substrate, sufficient adhesion cannot be obtained, and when tin plating is performed, tin plating does not enter. Had occurred
- the two-layer substrate obtained by the invention disclosed in Patent Document 4 has been able to obtain practically sufficient adhesion between the copper foil layer and the polyimide resin substrate due to recent technical progress. ing .
- the peeling strength is at least 0.8 kgfZcm or more at 90 ° peeling and 1.5 kgfZcm or more at 180 ° peeling, and it is more than 1.0 kgf / cm at 90 ° peeling. It is said that there is no problem if it is more than 1.5kgfZcm in 180 ° peeling.
- the inventors of the present invention have assiduously studied and conceived the surface-treated copper foil and the surface-treated copper foil with a carrier foil according to the present invention.
- the content of the present invention will be described in detail by separately describing items such as “surface-treated copper foil” and “surface-treated copper foil with carrier foil”.
- the surface-treated copper foil according to the present invention includes a type having a surface treatment layer on a glossy surface of an electrolytic copper foil (hereinafter referred to as “Type I”) and a type having a surface treatment layer on a rough surface of the electrolytic copper foil ( Hereinafter, this will be referred to as “type II”).
- Type I a type having a surface treatment layer on a glossy surface of an electrolytic copper foil
- type II a type having a surface treatment layer on a rough surface of the electrolytic copper foil
- the type I surface-treated copper foil according to the present invention can be further classified into two types (type Ia and type lb) depending on the type of the surface treatment layer.
- the type II surface-treated copper foil according to the present invention can be further classified into two types (type IIa and type lib) depending on the type of the surface treatment layer. In the following, I will explain separately.
- FIG. 1 shows a schematic cross-sectional shape of this type I surface-treated copper foil 1.
- the electrolytic copper foil 2 used for manufacturing the type I surface-treated copper foil 1 according to the present invention is used without intentionally performing a roughening treatment.
- a surface treatment layer 3 is provided on the smooth glossy side of the electrolytic copper foil 2, and the surface provided with the surface treatment layer 3 is used as an adhesive surface with the polyimide resin base material.
- a nickel zinc alloy layer or a cobalt zinc alloy layer is adopted as the surface treatment layer.
- one surface-treated copper foil belonging to Type I is “an electrolytic copper foil provided with a surface-treated layer for improving adhesion to a polyimide resin base material. are those provided on the shiny side of the copper foil, 65 w t% nickel or cobalt except inevitable impurities 90 wt%, zinc containing 10 wt% to 35 wt%, and the weight thickness 30mg / m 2 ⁇ 70 mg / m 2, which is a nickel-zinc alloy layer or a cobalt-zinc alloy layer. This is referred to as "Type Ia".
- the other surface-treated copper foil belonging to Type I is described in the above-mentioned electrolytically treated copper foil provided with a surface treatment layer for improving adhesion to a polyimide resin base on the glossy side.
- the surface treatment layer is provided on the glossy side of the electrolytic copper foil, and is a nickel-zinc-cobalt alloy layer that satisfies the following conditions A to C, and is characterized by a surface treatment for a polyimide resin base material.
- Condition A is “the total content of cobalt and nickel excluding unavoidable impurities is 65 wt% to 90 wt%, and zinc is 10 wt% to 35 wt%.”
- Condition B is “10 wt% nickel. .
- Type Ib the weight thickness of the cobalt alloy layer is 30mg Zm 2 ⁇ 70mgZm 2 "- zinc.
- the copper foil used in this type I is provided with a surface treatment layer on the glossy surface and is used as a bonding surface with the polyimide resin base.
- the glossy surface of the electrolytic copper foil does not fluctuate depending on the thickness of the electrolytic copper foil. Because there is no.
- flexible printed wiring boards do not It is common to use a copper foil with a thickness of 7 m to 35 ⁇ m, where the formation of a switch circuit is required in many cases.
- the glossy surface more preferably has a surface roughness (Rzjis) of 2.O / zm or less.
- the glossy surface is a replica of the shape of the cathode surface when producing an electrolytic copper foil, and is determined by how the roughness of the cathode surface is adjusted.
- the surface roughness (Rzjis) should be 2.0 m or less in order to eliminate the uneven shape of the interface with the polyimide resin substrate while applying force and to make it possible to form a fine pitch circuit as much as possible. Is more preferably 1.5 m or less.
- the surface roughness (Rzjis) is 0.5 m or more in order to secure the adhesion to a practical polyimide resin base material.
- the surface treatment layer which is the adhesive surface of the type I surface-treated copper foil to the polyimide resin base material, has a gloss [Gs (60 °;)] of 180% or less.
- This surface treatment layer is formed by a plating method as described later.
- the surface of the deposit surface formed by plating can be controlled in a wide range up to the glossy state and the matte state. This is considered to be different depending on whether the surface state of the plating layer has a very smooth state or a rough surface state having an extremely fine unevenness. However, it is difficult to measure the state of the unevenness at the relevant level using a surface roughness meter, and no difference can be found.
- glossiness As an alternative index indicating the state of the surface.
- the glossiness [Gs (60 °;)] is 180% or less, if the glossiness exceeds 180%, the adhesion to the polyimide resin substrate tends to vary. It is.
- the lower limit value varies depending on the manufacturing conditions of the surface treatment layer, and is not specified. However, in the case of the surface treatment layer obtained by adopting the manufacturing method described later, the type la and the type lb are used. Both are about 25%.
- Surface treatment layer of type la is, 65 wt% 90 wt% nickel or cobalt except inevitable impurities, zinc containing 10 wt% to 35 wt%, and the weight thickness 30mg / m 2 ⁇ 70mg / m 2 - It is a nickel-zinc alloy layer or a cobalt-zinc alloy layer.
- the nickel-zinc alloy or conoreto zinc alloy has a composition containing 65 wt% to 90 wt% of nickel or cobalt and 10 wt% to 35 wt% of zinc, excluding unavoidable impurities.
- the indication of wt% does not include unavoidable impurities, and the indication of 100% by weight of nickel or cobalt and zinc was adopted.
- the use of a nickel-based alloy or a conoreto-based alloy in this way is because the presence of nickel or cobalt improves the wettability with the polyimide resin base material and improves the adhesion.
- a barrier that prevents direct contact between copper and the polyimide resin when the flexible printed wiring board using the polyimide resin substrate is heated. This function is effective for preventing resin degradation due to the catalytic action of copper and preventing a decrease in the peel strength of the circuit after heating. If the nickel content or the cobalt content becomes excessively high while removing the copper, the surface treatment layer cannot be removed by the copper etching solution, resulting in an etching residue.
- a composition containing 65 wt% to 90 wt% of nickel or cobalt and 10 wt% to 35 wt% of zinc within the above range of the weight thickness is to be adopted.
- nickel-zinc alloy or conoreto dumbbell alloy was adopted because nickel or cobalt, which is excellent in corrosion resistance, and easily dissolved in an acid solution, which is generally called a base metal! This is because the combination of zinc and zinc facilitates dissolution and removal of nickel or cobalt which is hardly soluble in a copper etching solution by itself.
- the zinc content is less than 10 wt%, it becomes difficult to dissolve the nickel-zinc alloy or cobalt-zinc alloy with the copper etchant, and the nickel or cobalt component is likely to remain as an etching residue during circuit etching, resulting in insulation between circuits. Is insufficient and causes short circuit and surface layer migration.
- the zinc content exceeds 35% by weight, the adhesion between the surface-treated copper foil and the polyimide resin base material is reduced, and the tin penetration phenomenon when tin plating is performed is likely to occur. is there.
- a composition containing 66 wt% to 80 wt% of nickel and 34 wt% to 20 wt% of zinc should be used. , More preferred, is.
- the adhesion to the polyimide resin base material is improved, and at the same time, the tin squeezing phenomenon is effective.
- the thickness of the surface treatment layer also becomes a problem.
- An acidic solution such as an etching solution penetrates into A to reduce the adhesion of the circuit, and the tin plating liquid enters the interface A, and the tin plating layer 8 enters the lower part of the circuit 4. Therefore, it is necessary that the chemical resistance evaluated by alternative methods such as hydrochloric acid resistance be good.
- the nickel-zinc alloy layer or a cobalt-zinc alloy layer weight thickness weight thickness 30 mg / m 2 range ⁇ 70mg / m 2 as a surface treatment layer . If the weight thickness of these alloy layers is less than 30 mgZm 2 , good adhesion to the polyimide resin base material cannot be basically obtained. When the weight thickness of these alloy layers exceeds 70 mgZm 2 , the surface treatment layer becomes thick and good chemical resistance cannot be maintained. Chemical resistance tends to be better when the surface treatment layer formed on the copper foil is as thin as possible. In the case of nickel-one zinc alloy layer is the more preferable in a range of weight thickness 35m gZm 2 ⁇ 45mgZm 2.
- the chemical resistance is more stable when the weight thickness of the nickel-zinc alloy layer is less than 45 mgZm 2 .
- the weight thickness is more preferably in the range of 40 mgZm 2 to 70 mgZm 2 .
- Type lb surface treatment layer In the case of a type lb nickel-zinc-cobalt alloy layer, it is required to satisfy each condition of A to C.
- Condition A is “the total content of cobalt and nickel excluding unavoidable impurities is 65 wt% to 90 wt%, and zinc is 10 wt% to 35 wt%.”
- Condition B is “B: nickel 10 wt% to 70 wt%, cobalt that is contained in a range of 18wt% ⁇ 72wt%.
- condition C is” the weight thickness of the nickel zinc cobalt alloy layer is 30mgZm 2 ⁇ 70mgZm 2. ".
- the above composition is adopted for the nickel-zinc-cobalt alloy except for inevitable impurities.
- the indication of wt% does not include unavoidable impurities, and the indication of 100 wt% for nickel, zinc and cobalt was adopted.
- the reason for using such an alloy is the same as in the case of the type la, and the description thereof is omitted here.
- this nickel-zinc-cobalt alloy If the total content of nickel and konoleto is too large, it is not preferable because the surface treatment layer cannot be removed with the copper etchant and the etching residue remains.
- the total content of the cobalt content and the nickel content must be 65 wt% to 90 wt%, and zinc must be 10 wt% to 35 wt% (conditions).
- the alloy composition containing zinc was adopted because nickel and cobalt, which has excellent corrosion resistance, are easily dissolved in an acid solution, which is generally called a base metal! This is because nickel and konoleto, which are difficult to dissolve in the liquid, can be easily dissolved and removed.
- the zinc content is less than 10 wt%, it becomes difficult to dissolve nickel-zinc-cobalt with the copper etchant, and nickel and cobalt components tend to remain as etching residues during circuit etching, resulting in poor inter-circuit insulation. This is enough to cause short circuit, surface layer migration and the like.
- the zinc content exceeds 35% by weight, the adhesion between the surface-treated copper foil and the polyimide resin base is reduced, and the tin penetration phenomenon when tin plating is performed is likely to occur. It is.
- the contents of nickel and cobalt it is desirable to adopt a composition in which nickel is in a range of 10 wt% to 70 wt% and cobalt is in a range of 18 wt% to 72 wt% (condition B). If it deviates, it will be impossible to maintain a balance with the proper range of the above zinc content, which is irrational. Therefore, when the nickel content is 10 wt%, the cobalt content is 55 wt% to 80 wt%, and when the nickel content is 70 wt%, the cobalt content is 18 wt% to 20 wt%. If the nickel content is less than 10 wt%, it is difficult to remove with a copper etchant if the nickel content exceeds 70 wt%, which is not much different from the case where cobalt is used alone.
- the nickel zinc cobalt alloy layer as the surface treatment layer has a weight thickness in the range of 30 mgZm 2 to 70 mgZm 2 (condition C). If the weight thickness of the nickel-cobalt alloy layer is less than 30 mgZm 2 , good adhesion to the polyimide resin base material cannot be basically obtained. If the weight thickness of the nickel-zinc-cobalt alloy layer exceeds 70 mgZm 2 , the thickness as the surface treatment layer cannot maintain good chemical resistance. As mentioned above, the chemical resistance depends on the surface formed on the copper foil. The thinner the treatment layer is, the better it tends to be.
- the nickel-zinc-cobalt alloy layer has a weight thickness in the range of 30 mgZm 2 to 40 mgZm 2 .
- Nickel - Zinc - weight of cobalt alloy layer thickness 40MgZm 2 within at chemical performance is the most stable.
- This type II surface-treated copper foil has a roughened surface of an electrolytic copper foil provided with a surface treatment layer for improving adhesion to a polyimide resin base material.
- Figure 3 shows the cross-sectional schematic shape of this type II surface-treated copper foil lb.
- the electrolytic copper foil 2 used for producing the type II surface-treated copper foil lb according to the present invention is used without performing roughening treatment on the rough surface.
- the surface treatment layer 3 is provided on the rough surface of the electrolytic copper foil 2, and the surface on which the surface treatment layer 3 is provided is used as an adhesive surface with the polyimide resin base material.
- Type II a nickel-zinc alloy layer, a cobalt-zinc alloy layer or a nickel-zinc-cobalt alloy layer is employed as the surface treatment layer. That is, the only difference between Type II and Type I is the difference in whether the surface treatment layer is provided on the rough or glossy surface of the electrolytic copper foil. However, since the rough surface has a gentle undulation from the beginning as compared to the glossy surface, there is a difference in the biting property when the rough surface is bonded to the polyimide resin base material. Therefore, Type II is more advantageous than Type I in providing higher peel strength. On the other hand, Type I has an undulation on the surface of the copper foil that comes into contact with the polyimide resin base material, and therefore requires some over-etching time compared to Type I, which is disadvantageous for forming fine pitch circuits. It can be said.
- One surface-treated copper foil belonging to Type II is "an electrolytic copper foil provided with a surface-treated layer for improving adhesion to a polyimide resin substrate, wherein the surface-treated layer is formed of an electrolytic copper foil.
- the surface-treated layer is formed of an electrolytic copper foil.
- Surface treated copper foil for polyimide resin base material characterized in that it is a nickel zinc alloy layer or a cobalt zinc alloy layer.
- This is referred to as "Type IIa”.
- Another type of surface-treated copper foil belonging to Type II is "an electrolytic copper foil provided with a surface-treated layer for improving adhesion to a polyimide resin base material.
- a surface-treated copper foil for a polyimide resin base material which is provided on the roughened surface side of a pulverized copper foil and is a nickel zinc cobalt alloy layer satisfying the following conditions A to C.
- condition A is “excluding unavoidable impurities, the total content of konoleto content and nickel content should be 65 wt% to 90 wt%, and zinc should be 10 wt% to 35 wt%”.
- matter B is "B:.
- nickel lwt% ⁇ 75wt%, cobalt be contained in the range of 15wt% ⁇ 75wt%"
- the weight thickness of condition C is "nickel-zinc-cobalt alloy layer is at 35mgZm 2 ⁇ 120mgZm 2 This is referred to as "Type IIb.”
- the upper and lower limits of these conditions are for the same reasons as in the case of type lb described above.
- the thickness and the like of the electrolytic copper foil used in this type I there is no particular limitation on the thickness and the like of the electrolytic copper foil used in the same manner as in type I.
- a rough surface is provided with a surface treatment layer and used as a bonding surface with a polyimide resin substrate.
- the rough surface of the electrolytic copper foil is greatly affected by the thickness of the electrolytic copper foil. Therefore, when a fine pitch circuit is to be formed using Type I, it is preferable to use a general electrolytic copper foil having a thickness of 18 / zm or less.
- the lower limit value of the electrolytic copper foil is the thickness of 7 m, which is the manufacturing limit that can be manufactured without a carrier foil.
- a belly rope mouth file VLP with a thickness of 35 ⁇ m or less showing surface roughness comparable to the glossy surface of ordinary electrolytic copper foil It is preferable to use a rough surface of copper foil.
- the surface roughness (Rzjis) of the rough surface at this time is assumed to be 1.0 m or more!
- electrolytic copper foil has been subjected to rough rope rope filing, and it is possible to obtain a smooth rough surface equivalent to or less than the glossy surface, which is the transfer surface of the surface shape of the electrolytic drum.
- the crystal orientation and grain size are generally different between the glossy surface, which is the surface where copper is deposited, and the rough surface, which is the surface where copper is deposited.
- the surface may be used as a smoother surface, for example, by performing a treatment, and the surface roughness (Rzjis) is specified to be 1.0 / zm or more in consideration of the current field requirements.
- a surface-treated layer is formed on a rough surface.
- the glossy surface and the rough surface have a difference of about 1.2 to 2.3 times. If you try to form a rough surface with the same thickness as the glossy surface, In addition, the amount must be deposited in consideration of the difference in specific surface area as the weight and thickness.
- the rough surface has an uneven shape, the use of long-time plating or high-speed plating at high current may increase the possibility of current concentration on abnormally shaped parts such as slight protrusions. The thickness uniformity of the deposited plating layer is impaired. Therefore, it is necessary to improve the adhesion to the polyimide resin base material and to employ a surface treatment layer having excellent production stability.
- the ⁇ it is preferable to adopt a range of weight thickness 35mgZm 2 ⁇ 120mgZm 2.
- the weight thickness of the nickel-zinc alloy layer or the cobalt-zinc alloy layer is less than 35 mgZm 2 , basically, good adhesion to the polyimide resin base material cannot be obtained.
- the weight thickness of the nickel-zinc alloy layer or the cobalt-zinc alloy layer exceeds 120 mgZm 2 , the thickness as the surface treatment layer becomes non-uniform and good chemical resistance cannot be maintained. Chemical resistance tends to be better when the surface treatment layer formed on the copper foil is as thin as possible.
- the nickel zinc alloy layer or the cobalt zinc alloy layer has a weight thickness in the range of 35 mgZm 2 to 85 mgZm 2 . Write within the weight thickness 85MgZm 2 of the surface treatment layer is to stabilize the chemical performance.
- the type lib forms a surface treatment layer on a rough surface having a large specific surface area, unlike the glossy surface of the type I. Therefore, when the surface treatment layer is formed, the adhesion to the polyimide resin substrate is improved, and the production stability is excellent, taking into account the maintenance of the uniformity of the thickness of the deposited plating layer, which is similar to that of type Ila.
- the surface treatment layer thickness must be adopted. [0041] Therefore, in the case of type lib, it is the is preferably a nickel-zinc-cobalt alloy layer on the weight of the thick 35mgZm 2 ⁇ 120mgZm 2 range as the surface treatment layer.
- the weight thickness of the nickel-zinc-cobalt alloy layer is less than 35 mgZm 2 , good adhesion to the polyimide resin base material cannot be basically obtained. Then, in the surface treatment layer in which the weight thickness of the nickel-zinc-cobalt alloy layer exceeds 120 mgZm 2 , abnormal growth portions are seen, the uniformity of the film thickness is impaired, and good chemical resistance cannot be maintained. As described above, the chemical resistance tends to be better when the surface treatment layer on the copper foil is as thin as possible. Therefore, it is more preferable that the nickel zinc cobalt alloy layer has a weight thickness in the range of 40 mgZm 2 to 80 mgZm 2 . Is the most stable I spoon chemical performance within the weight thickness 80 mgZm 2 of nickel-zinc-cobalt alloy layer
- the type I and type II copper foils described above have a chromate layer as a protective layer on the surface of the surface treatment layer. Even if the chromate layer is provided, the adhesion to the polyimide resin base material is improved, and the long-term storage stability of the surface-treated copper foil is ensured.
- a silane coupling agent-treated layer on the surface treatment layer to be an adhesive surface with the polyimide resin base material and the chromate layer formed on the surface treatment layer.
- a silane coupling agent it is possible to improve the wettability between the metal and the organic material, and to improve the adhesion when bonding.
- an amino silane coupling agent or a mercapto silane coupling agent it is more preferable to use an amino silane coupling agent or a mercapto silane coupling agent.
- these silane coupling agents these most contribute to the improvement of the adhesion between the copper foil layer and the polyimide resin base material.
- the carrier-treated surface-treated copper foil 10 includes a bonding interface layer 7 on the surface of the carrier foil 6, and the electrolytic copper foil layer 2 is provided on the bonding interface layer 7, The surface treatment layer 3 is provided on the electrolytic copper foil layer 2.
- metal foils such as aluminum foil, copper foil, etc. Organic films having electrical conductivity.
- the requirement for conductivity is due to the manufacturing method described below.
- the thickness of the carrier foil is not particularly limited, but the presence of the carrier foil makes it possible to make the electrolytic copper foil layer 2 extremely thin, and is particularly useful when the thickness is 9 m or less. It is.
- an electrolytic copper foil for the carrier foil.
- an electrolytic copper foil is produced through an electrolytic process and a surface treatment process, and is mainly used as a basic material for manufacturing a printed wiring board used in the fields of the electric and electronic industries.
- the electrolytic copper foil used for the carrier foil preferably has a thickness of 12 m to 210 ⁇ m.
- the reason why the thickness of the electrolytic copper foil used as the carrier foil is set to 12 111 to 210 111 is that the ultra-thin copper foil of 9 m or less as a carrier foil functions as a reinforcing material for preventing wrinkles from occurring.
- a thickness of at least about 12 m is required, and if the thickness exceeds the upper limit of 210 m, it exceeds the concept of foil and is more like a copper plate, and it is difficult to wind it into a roll. Because it becomes.
- an etchable type which requires etching and removal of the carrier foil of the surface-treated copper foil with a carrier foil, and a peeling and removal of the carrier foil. It is divided into beable type that can do things. In the case of the present invention, it is described as a concept including both of these.
- the bonding interface layer is manufactured by depositing a small amount of a metal component such as zinc, and then forming a Balta copper layer on the bonding interface layer.
- a metal component such as zinc
- a metal that forms a thick layer of metal oxide such as zinc or chromium or chromate
- an organic agent are used. It is formed using.
- a bonding interface layer using an organic agent.
- This is a material that can stabilize the peel strength at a low level when peeling the carrier foil.
- the organic agent used here one or more selected from the group consisting of a nitrogen-containing organic compound, a sulfur-containing organic compound and a carboxylic acid is used.
- the nitrogen-containing organic compound is a triazole derivative having a substituent. It is preferable to use 1,2,3-benzotriazole, carboxybenzotriazole and the like.
- the sulfur-containing organic compound it is preferable to use mercaptobenzothiazole, thiocyanuric acid and 2-benzimidazolethiol.
- the carboxylic acid it is preferable to use oleic acid, linoleic acid, linoleic acid, and the like, especially when monocarboxylic acid is preferably used.
- the thickness of the electrolytic copper foil layer is not particularly limited. It is desirable to adopt a thickness of 12 m or less while applying force. If the thickness is more than 12 m, the purpose of facilitating the handling of ultra-thin copper foil, which is the advantage of surface-treated copper foil with a carrier foil, will be neglected.
- the thickness of the electrolytic copper foil layer should be 5 m or less, more preferably 3 m or less. It is more preferable. In practice, the thickness is preferably 0.5 m to 12 m.
- the meaning of setting the upper limit of the thickness is as described above. If the thickness of the electrolytic copper foil layer has a uniform thickness, if the thickness is not more than 0.5 m, the occurrence of microporosity and the like will occur. It does not have the basic quality required of copper foil. In addition, if the areas used for Type I and Type II described above are to be clearly separated and used, the electrolytic copper foil layer should be less than 7 m.
- the surface of the electrolytic copper foil layer forming the surface treatment layer 3 is Has a rough surface similar to that of Type II described above. Therefore, it seems that the type II concept described above can be applied as it is to the concept of the surface treatment layer.
- a characteristic of this surface-treated copper foil with a carrier foil is that the thickness of the electrolytic copper foil layer can be in the range of 0.5 ⁇ m to 7 ⁇ m. . When the thickness of the electrolytic copper foil layer is reduced, the surface roughness of the rough surface approaches the roughness of the glossy surface, and there is no need to distinguish between the two.
- the thickness of the electrolytic copper foil layer is less than 7 m, the concept regarding the surface treatment layer similar to the type I described above is applied. If the thickness of the electrolytic copper foil layer is 7 m or more, the concept of type II surface treatment layer is applied.
- nickel-zinc alloy layer or a cobalt zinc alloy layer is used as the surface treatment layer on the surface of the electrolytic copper foil layer
- nickel or cobalt is 65 wt% to 90 wt%
- zinc is 10 wt% to containing 35 wt%
- weight thickness 35mg Zm 2 ⁇ 70mgZm 2! /
- the condition A is “the total content of the cobalt content and the nickel content excluding unavoidable impurities is 65 wt%. ⁇ 90wt%, zinc should be contained in the range of 10wt% ⁇ 35wt%.
- Condition B is
- nickel should be contained in the range of lwt% ⁇ 75wt%
- cobalt should be in the range of 15wt% ⁇ 75wt%.
- the condition C satisfies “the weight thickness of the nickel-zinc-cobalt alloy layer is 35 mg / m 2 to 70 mgZm 2 ”. The reasons for setting the upper and lower limits of these numerical values are the same as in the case of the nickel zinc cobalt alloy layer described above. The upper limit of the weight thickness is set to 70 mgZm 2 for the same reason as described above.
- the above-described surface-treated copper foil with a carrier foil is preferably provided with a chromate layer as a heat-resistant treatment layer on the surface of the surface-treated layer. Further, it is preferable to provide a silane coupling agent-treated layer on the surface treatment layer serving as an adhesion surface with the polyimide resin base material and the chromate layer formed on the surface treatment layer.
- a silane coupling agent-treated layer on the surface treatment layer serving as an adhesion surface with the polyimide resin base material and the chromate layer formed on the surface treatment layer.
- a flexible copper-clad laminate having good adhesion between the copper foil layer and the polyimide resin layer can be obtained. Even if circuit etching is performed using this copper-clad laminate, and then tin plating is performed, the phenomenon of tin sneaking into the interface between the circuit and the polyimide resin substrate does not occur, and high-quality flexible Thus, a printed wiring board can be obtained.
- the surface-treated copper foil with a carrier foil is bonded to a polyimide resin base material, and then the carrier foil is removed, whereby the copper foil layer and the polyimide film are removed. It becomes a flexible copper-clad laminate having good adhesion to the fat layer.
- the thickness of the copper foil layer can be 0.5 ⁇ m to 3 ⁇ m, which is suitable for use in forming an ultra-fine pitch circuit.
- a TAB film carrier tape obtained by slitting the surface-treated copper foil or the surface-treated copper foil with a carrier foil according to the present invention into a tape shape and directly laminating the slit with a polyimide resin tape. It is most suitable for the application.
- the surface-treated copper foil for a polyimide resin base material and the surface-treated copper foil with a carrier foil according to the present invention are obtained by forming a nickel-zinc alloy or a nickel-zinc-cobalt alloy on the bonding surface with the polyimide resin base material.
- a surface treatment layer made of a polyimide resin good adhesion to a polyimide resin base material can be obtained without performing roughening treatment.
- the electrolytic copper foil immediately after being produced from a copper electrolytic solution such as a copper sulfate solution is in an activated state, easily combined with oxygen in the air, and easily forms an extra oxide film immediately. Therefore, before forming the surface treatment layer on the copper foil surface, it is preferable to perform a cleaning treatment on the electrolytic copper foil surface. This is for ensuring uniform electrodeposition and the like in the following surface treatment layer forming step.
- Purification treatment is a so-called pickling treatment, such as hydrochloric acid solution, sulfuric acid solution, sulfuric acid, hydrogen peroxide
- Various solutions such as a system solution can be used, and there is no particular limitation. If necessary, it is also possible to combine a degreasing treatment with an aqueous sodium hydroxide solution before pickling. It is sufficient to adjust these solution concentrations and liquid temperatures according to the characteristics of the production line.
- Nickel-zinc alloy coated surface treatment layer When a nickel-zinc alloy layer is formed, for example, nickel sulfate is used at a nickel concentration of lgZl to 2.5 gZl, and zinc pyrophosphate is used at a zinc concentration of 0. . LgZl ⁇ lgZl, potassium pyrophosphate 50GZl ⁇ 500gZl, liquid temperature 20 ⁇ 50 ° C, pH8 ⁇ ll, be employed a current density of 0. 3 ⁇ 10AZdm 2 preferred. By plating under these conditions, a nickel-zinc alloy layer with excellent film thickness uniformity can be obtained. Therefore, if the above conditions are deviated, the nickel content increases, resulting in etching residue when forming a circuit, or the zinc ratio becomes too large, and the chemical resistance and solder heat resistance tend to decrease. .
- Cobalt renewal Surface treatment layer with jft combined residual strength When forming a cobalt-zinc alloy layer, for example, cobalt sulfate is used, and the cobalt concentration is from lgZl to 2. Og / U. There 0. lgZl ⁇ lgZl, potassium pyrophosphate 50GZl ⁇ 500gZl, liquid temperature 20 ⁇ 50 ° C, pH8 ⁇ ll, be employed a current density of 0. l ⁇ 10AZdm 2 preferred. By performing plating under these conditions, a cobalt-zinc alloy layer having excellent film thickness uniformity can be obtained. Therefore, if the above conditions are deviated, the content of the conjugate will increase, resulting in the occurrence of etching residue when forming a circuit, and the tendency of chemical resistance and solder heat resistance to decrease due to excessive zinc ratio. Become.
- any of a substitution method and an electrolytic method may be employed according to a conventional method, and there is no particular limitation. Due to the presence of the chromate layer force, the corrosion resistance is improved and, at the same time, the adhesion to the polyimide resin layer is also improved.
- silane coupling agent treatment layer between the electrolytic copper foil layer and the polyimide resin layer.
- the silane-coupling-agent-treated layer serves as an auxiliary agent to improve the wettability with the electrolytic copper foil surface that has not been roughened and to improve the adhesion when pressed onto a polyimide resin substrate. It fulfills.
- various types of silane coupling agents such as epoxy-functional silane coupling agents, olefin-functional silanes, and acrylic-functional silanes, can be used to obtain polyimide resin base materials.
- the copper foil layer to improve the peel strength.
- an amino-functional silane coupling agent or a mercapto-functional silane coupling agent is used, the peel strength is particularly remarkably improved, which is preferable.
- the method of forming the silane coupling agent-treated layer is not particularly limited, such as a commonly used dipping method, showering method, spraying method, and the like. According to the process design, any method that can bring the surface treatment layer and the solution containing the silane coupling agent into contact with and adsorb it most uniformly may be used.
- the silane coupling agent that can be used here will be specified more specifically.
- the same coupling agents used for the glass cloth of pre-preda for printed wiring boards are mainly used for vinyltrimethoxysilane, vinylphenyltrimethoxysilane, ⁇ -methacryloxybutyltrimethoxysilane, ⁇ -aminopropyltriethoxysilane, ⁇ — ⁇ (aminoethyl) ⁇ -aminopropyltrimethoxysilane, ⁇ — 3— (4— (3-aminopropoxy) butoxy ) Propyl-3-aminopropyltrimethoxysilane, imidazolesilane, triazinesilane, y-mercaptopropyltrimethoxysilane, and the like can be used.
- an amino-based silane coupling agent is suitable, and ⁇ -aminopropyltriethoxysilane, ⁇ - ⁇ (aminoethynole) ⁇ -aminopropyltrimethoxysilane, 3—3— (4— (3-A) Minopropoxy) butoxy) propyl 3-aminopropyltrimethoxysilane. —
- silane coupling agents are used by dissolving 0.5 to: LOgZl in water as a solvent at a temperature of room temperature.
- the silane coupling agent forms a film by condensing with an OH group protruding on the metal surface, and its effect is not significantly increased even if a solution having an unnecessarily high concentration is used. Therefore, it should originally be determined according to the processing speed of the process.
- the amount is less than 0.5 gZl
- the adsorption speed of the silane coupling agent is slow, which is not suitable for general commercial profitability, and the adsorption becomes uneven.
- the concentration exceeds lOgZl, the adsorption speed is not particularly increased, which is uneconomical.
- the surface-treated layer is formed through the above steps, and the surface-treated copper foil according to the present invention is obtained. Then, a chromate treatment layer and a silane coupling agent treatment layer are provided on the surface of the surface treatment layer of the surface-treated copper foil, if necessary.
- the production of the surface-treated copper foil with a carrier foil itself can be achieved by using a standard method, a description thereof is omitted here.
- the concept applied when forming the surface treatment layer of the nickel-zinc alloy or nickel-zinc-cobalt alloy composition of the surface-treated copper foil described above is applied.
- a type la surface-treated copper foil was manufactured.
- electrolytic copper foil Mitsui Kinzoku VLP copper foil with a thickness of 18 m manufactured by Mining Co., Ltd. was used.
- the surface of the electrodeposited copper foil was pickled to completely remove the adhering fat / oil component, and an extra surface oxide film was removed.
- This pickling treatment was performed using a dilute sulfuric acid solution having a concentration of 100 g ZL and a liquid temperature of 30 ° C., with an immersion time of 30 seconds. By this pickling treatment, the attached oil and excess surface oxide film were removed.
- This pickling treatment was performed using a dilute sulfuric acid solution having a concentration of 100 g ZL and a liquid temperature of 30 ° C. for an immersion time of 30 seconds, followed by water washing.
- the same conditions were adopted when performing nickel-zinc alloy plating.
- the composition of the plating solution was adjusted using cobalt sulfate, zinc pyrophosphate, and potassium pyrophosphate. Electrolysis was carried out at a temperature of 40 ° C. to form a cobalt-zinc alloy plating layer containing 45 wt% of cobalt and 55 wt% of zinc and having a thickness of 65.4 mg / m 2 and washed with water.
- the same conditions were adopted when performing cobalt-zinc alloy plating.
- a chromate treatment layer was formed on each surface treatment layer.
- a chromate layer was formed by electrolysis on the nickel zinc alloy plating layer or the cobalt zinc alloy plating layer.
- the electrolysis conditions at this time were chromic acid 1. Og / U solution temperature 35 ° C, current density 8AZdm 2 , and electrolysis time 5 seconds.
- the same conditions were employed when forming a chromate layer.
- a silane coupling agent treatment layer was formed on the chromate treatment layer.
- Silane power The coupling layer is formed by spraying ion-exchanged water as a solvent and adding ⁇ -aminopropyltrimethoxysilane to a concentration of 5 gZl to the chromate layer surface by showering, followed by drying oven. This was performed by keeping the foil temperature in an atmosphere at 150 ° C. for 4 seconds to expel moisture and accelerate the condensation reaction of the silane coupling agent.
- the same conditions were employed when performing the silane coupling agent treatment.
- a type la surface-treated copper foil was obtained.
- the surface-treated copper foil having the nickel-zinc alloy layer formed thereon is referred to as a first surface-treated copper foil, and the one having the cobalt-zinc alloy layer formed thereon is referred to as a second surface-treated copper foil.
- a polyimide resin base layer is formed on the surface-treated layers of the first surface-treated copper foil and the second surface-treated copper foil by using a widely known casting method to obtain a flexible copper-clad laminate.
- An etching resist layer is formed on the copper foil surface of the flexible copper-clad laminate, the etching pattern is exposed and developed, circuit etching is performed, the resist is peeled off, and a 0.2 mm wide linear circuit for peeling strength measurement is formed.
- the formed test flexible printed wiring board was used. When the peel strength was measured using this linear circuit, the normal peel strength of the first surface-treated copper foil was 1.87 kgfZcm, the degradation rate of hydrochloric acid resistance was 2.3%, and the second surface-treated copper foil was Has a normal peel strength of 1.94 kgfZcm and a deterioration rate of hydrochloric acid resistance of 3.0%, indicating good adhesion to the polyimide resin base material.
- the peel strength was measured using 180 ° peeling, and the same applies to the following examples and comparative examples.
- tin plating was performed on a straight circuit for measuring the peeling strength of the test flexible printed wiring board, and the penetration of the tin plating was evaluated.
- the tin plating condition at this time was Acid first tin concentration with tin 20GZl, liquid temperature 30 ° C, pH3, loosened electrodeposition at a current density 5AZdm 2, and tin layer thicknesses.
- the evaluation of the penetration of the tin plating was performed by peeling the circuit after the tin plating, observing the side end of the peeled surface of the circuit with an optical microscope, and judging whether tin plating adhesion was recognized or not. As a result, when the first surface-treated copper foil and the second surface-treated copper foil were used, even though the gap was small, the penetration of the tin plating was hardly confirmed.
- Example 1 a type-lb surface-treated copper foil was manufactured.
- plating was performed using cobalt sulfate, nickel sulfate, zinc sulfate, and boric acid. adjust the liquid composition, liquid temperature 50 ° C, pH 4. 5, and electrolysis conditions of current density 8AZdm 2, nickel, zinc, and change the composition and the weight thickness of cobalt, five different nickel-zinc-cobalt if A gold plating layer was formed as a surface treatment layer and washed with water.
- five types of surface-treated copper foils were obtained. These surface-treated copper foils will be referred to as “21”, “2-2”, “2-3”, “2-4”, and “2-5”.
- Example 1 Using each of the above surface-treated copper foils, in the same manner as in Example 1, a test flexible printed wiring board having a 0.2 mm-wide linear circuit for peel strength measurement was obtained. Then, using this linear circuit, the normal peeling strength and the rate of deterioration of hydrochloric acid resistance when each surface-treated copper foil was used were determined, and the penetration of tin plating was evaluated in the same manner as in Example 1. The results of this evaluation are summarized in Table 1.
- Example 1 a type Ila surface-treated copper foil was manufactured.
- the cleaning treatment of the electrolytic copper foil, the formation of the chromate layer, the formation of the silane coupling agent treatment layer, the production of the flexible copper-clad laminate, and the test The same applies to the manufacture of flexible printed wiring boards for industrial use. Therefore, only the formation of the surface treatment layer and the evaluation results will be described.
- a nickel-zinc alloy plating layer having a weight thickness of 80.3 mgZm 2 was formed and washed with water.
- formed by using a cobalt-zinc alloy plating solution cobalt 45 wt%, zinc contained 55 wt%, and the cobalt-zinc alloy plated layer having a weight thickness of 65. 4mgZm 2 And washed with water.
- a surface-treated layer was formed, and the same treatment as in Example 1 was performed to obtain a first surface-treated copper foil and a second surface-treated copper foil.
- Example 2 Using a first surface-treated copper foil and a second surface-treated copper foil, in the same manner as in Example 1, a test flexible printed circuit having a 0.2 mm-width linear circuit for peel strength S and strength measurement was formed. A wire plate was obtained.
- the peel strength was measured using this linear circuit, the normal peel strength of the first surface-treated copper foil was 1.88 kgfZcm, the hydrochloric acid resistance deterioration rate was 3.5%, and the second surface-treated copper foil Normal peeling strength of foil 1.98kgfZcm, hydrochloric acid resistance deterioration rate was 2.8%, indicating good adhesion to the polyimide resin base material.
- the penetration of the tin plating was evaluated in the same manner as in Example 1. However, the penetration of the tin plating was hardly confirmed in both the first surface-treated copper foil and the second surface-treated copper foil.
- the composition of the plating solution was determined using cobalt sulfate, nickel sulfate, zinc sulfate, and boric acid. adjust the solution temperature 50 ° C, pH4. 5, loosened electrodeposition at a current density 8AZdm 2, nickel 9 wt%, zinc 55 wt%, the cobalt containing 18 wt%, and the weight thickness 65. 4MgZm A nickel-zinc-cobalt alloy plating layer of No. 2 was formed and washed with water.
- five types of surface-treated copper foils were obtained. These surface-treated copper foils are referred to as “4-1”, “42”, “43”, “44”, and “45”.
- Example 2 Using each of the above surface-treated copper foils, in the same manner as in Example 1, a test flexible printed wiring board having a 0.2 mm-wide linear circuit for peel strength measurement was obtained. Then, using this linear circuit, the normal peeling strength and the rate of degradation of hydrochloric acid resistance when each surface-treated copper foil was used were determined, and the penetration of tin plating was evaluated in the same manner as in Example 1. Table 2 summarizes the evaluation results.
- an electrolytic copper foil having a thickness of 35 ⁇ m was used as a carrier foil, a bonding interface layer of oxidized chromium was provided on the glossy surface, and a copper sulfate solution was electrolyzed on the bonding interface layer.
- An electrolytic copper foil with a carrier foil provided with an electrolytic copper foil layer having a thickness of 3 ⁇ m was used.
- the surface roughness (R zjis) of this electrolytic copper foil layer is 1. ⁇ .
- Example 2 On the electrolytic copper foil surface of the electrolytic copper foil with the carrier foil, the same nickel-zinc plating solution as in Example 1 was used to contain 71% by weight of nickel and 29% by weight of zinc, and to have a weight thickness of 50%.
- a nickel-zinc alloy plating layer of 2 mgZm 2 was formed, and the same process as in Example 1 was performed to obtain a surface-treated copper foil with a first carrier foil.
- a cobalt-zinc alloy plating layer containing 45 wt% of cobalt and 55 wt% of zinc and having a weight thickness of 45.4 mg / m 2 was formed.
- a surface-treated copper foil with a second carrier foil was obtained.
- the copper foil of the flexible copper-clad laminate The layer was electrolyzed with a copper sulfate solution until the layer became 18 m thick, plated up, etched, and peeled off to obtain a flexible printed wiring board for testing that formed a 0.2 mm wide linear circuit for strength measurement. .
- the peel strength was measured using this linear circuit, the normal peel strength of the surface-treated copper foil with the first carrier foil was 1.81 kgf / cm.
- the rate of deterioration of hydrochloric acid resistance is 3.0%
- the normal peel strength of the surface-treated copper foil with the second carrier foil is 1.87kgfZcm
- the rate of deterioration of hydrochloric acid resistance is 3.1%
- a good polyimide resin base Adhesion with the material was shown. Furthermore, in the case of using either the surface-treated copper foil with the first carrier foil or the surface-treated copper foil with the second carrier foil, the power to evaluate the penetration of tin plating was the same as in Example 1. It was hardly confirmed.
- Example 5 the same electrolytic copper foil having a thickness of 35 ⁇ m as used in Example 5 was used as a carrier foil, and a bonding interface layer of oxidized chromium was provided on its glossy surface. A copper sulfate solution was electrolyzed on the interface layer, and an electrolytic copper foil with a carrier foil having an electrolytic copper foil layer having a thickness of 3 IX m was used.
- Example 2 using the same nickel-zinc-cobalt plating solution as in Example 2, 33% by weight of nickel, 10% by weight of zinc, and 57% by weight of Connort were provided on the electrolytic copper foil surface of the electrolytic copper foil with a carrier foil. Then, a nickel-zinc-cobalt alloy plating layer having a weight thickness of 45. Omg / m 2 was formed, and five kinds of surface-treated copper foils with a carrier foil were obtained in the same manner as in Example 1. These surface-treated copper foils will be referred to as “6-1”, “6-1”, “6-3”, and “6-4”.
- Example 2 Using the above-mentioned surface-treated copper foil with a carrier foil, press-molding was performed in the same manner as in Example 1, and the carrier foil was peeled off. The solution was electrolytically plated up, etched, and peeled off to obtain a test flexible printed wiring board having a 0.2 mm wide linear circuit for strength measurement. Then, using this linear circuit, the normal peel strength and the deterioration rate of hydrochloric acid resistance in the case of using the surface-treated copper foil with a carrier foil were determined, and further, as in Example 1, the penetration of the tin plating was determined. Was evaluated. Table 3 summarizes the evaluation results.
- a surface-treated copper foil having a nickel-zinc alloy layer with a high zinc content formed thereon as the surface-treated layer of Example 1 was manufactured, and the same performance evaluation as in the above-mentioned example was performed.
- Electrolysis is carried out at a concentration of 0.4 lg / zinc pyrophosphate with a zinc concentration of 5.4 gZl, potassium pyrophosphate 100 g / 1, and a liquid temperature of 40 ° C, containing 46 wt% of nickel and 54 wt% of zinc, and A zinc-nickel alloy plating layer having a weight of 42.3 mgZm 2 was formed and washed with water.
- Example 2 In the same manner as in Example 1, a test flexible printed wiring board having a 0.2-mm-wide linear circuit for measuring the peel strength was obtained.
- the peel strength was measured using this linear circuit, the normal peel strength was 1.65 kgfZcm, the hydrochloric acid resistance deterioration rate was 12.3%, and both the peel strength and the hydrochloric acid resistance deterioration rate were measured.
- the results were inferior to the above examples.
- the penetration of the tin plating was evaluated in the same manner as in Example 1. However, the penetration of the tin plating about 2 m from the end of the circuit was confirmed. Industrial applicability
- the surface-treated copper foil and the surface-treated copper foil with a carrier foil according to the present invention do not require a roughening treatment on the bonding surface with the polyimide resin base, so that the production process can be omitted, and Cost reduction is possible. Even if the roughening treatment of the electrolytic copper foil layer is omitted, the peeling strength enough to withstand practical use as a flexible printed wiring board can be obtained. Since the squeezing phenomenon does not occur, the adhesion stability to the polyimide resin base material is excellent. Furthermore, since the copper foil layer is not roughened, there is no need to provide an over-etching time even in the circuit etching process, greatly reducing the processing cost and forming a finer circuit than the 50 ⁇ m pitch circuit. It is also suitable for.
- FIG. 1 A schematic cross-sectional view of a surface-treated copper foil (type I) according to the present invention.
- FIG. 2 is a schematic cross-sectional view showing the immersion phenomenon of tin plating.
- FIG. 3 is a schematic cross-sectional view of a surface-treated copper foil (Type II) according to the present invention.
- FIG. 4 is a schematic sectional view of a surface-treated copper foil with a carrier foil according to the present invention.
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Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US11/628,446 US20070237976A1 (en) | 2004-06-03 | 2005-06-02 | Surface Treated Copper Foil, Flexible Copper-Clad Laminate Manufactured Using the Same, and Film Carrier Tape |
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JP2004-166320 | 2004-06-03 | ||
JP2004166320A JP2005344174A (ja) | 2004-06-03 | 2004-06-03 | 表面処理銅箔及びその表面処理銅箔を用いて製造したフレキシブル銅張積層板並びにフィルムキャリアテープ |
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CN (1) | CN1989793A (ja) |
TW (1) | TW200604001A (ja) |
WO (1) | WO2005120139A1 (ja) |
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CN108718485B (zh) * | 2018-06-07 | 2021-02-02 | 珠海元盛电子科技股份有限公司 | 一种制造细线厚铜双面fpc的半加成法技术 |
US10697082B1 (en) * | 2019-08-12 | 2020-06-30 | Chang Chun Petrochemical Co., Ltd. | Surface-treated copper foil |
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- 2005-06-02 TW TW094118166A patent/TW200604001A/zh not_active IP Right Cessation
- 2005-06-02 US US11/628,446 patent/US20070237976A1/en not_active Abandoned
- 2005-06-02 CN CNA2005800254045A patent/CN1989793A/zh active Pending
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JPH05140765A (ja) * | 1991-11-15 | 1993-06-08 | Nikko Guurudo Foil Kk | 印刷回路用銅箔の表面処理方法 |
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Also Published As
Publication number | Publication date |
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TW200604001A (en) | 2006-02-01 |
JP2005344174A (ja) | 2005-12-15 |
TWI296236B (ja) | 2008-05-01 |
US20070237976A1 (en) | 2007-10-11 |
CN1989793A (zh) | 2007-06-27 |
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