WO2009034764A1 - プリント配線基板の製造方法および該製造方法により得られたプリント配線基板 - Google Patents
プリント配線基板の製造方法および該製造方法により得られたプリント配線基板 Download PDFInfo
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- WO2009034764A1 WO2009034764A1 PCT/JP2008/061792 JP2008061792W WO2009034764A1 WO 2009034764 A1 WO2009034764 A1 WO 2009034764A1 JP 2008061792 W JP2008061792 W JP 2008061792W WO 2009034764 A1 WO2009034764 A1 WO 2009034764A1
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Classifications
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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
- H05K3/02—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
- H05K3/06—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 the conductive material being removed chemically or electrolytically, e.g. by photo-etch process
- H05K3/067—Etchants
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- 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
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/48—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
- C23C22/52—Treatment of copper or alloys based thereon
-
- 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
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/48—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
- C23C22/58—Treatment of other metallic material
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- 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
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/10—Etching compositions
- C23F1/14—Aqueous compositions
- C23F1/16—Acidic compositions
- C23F1/18—Acidic compositions for etching copper or alloys thereof
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- 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
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/10—Etching compositions
- C23F1/14—Aqueous compositions
- C23F1/16—Acidic compositions
- C23F1/28—Acidic compositions for etching iron group metals
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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
- H05K3/02—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
- H05K3/06—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 the conductive material being removed chemically or electrolytically, e.g. by photo-etch process
-
- 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
- H05K3/22—Secondary treatment of printed circuits
- H05K3/26—Cleaning or polishing of the conductive pattern
-
- 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
-
- 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
- H05K2201/07—Electric details
- H05K2201/0753—Insulation
- H05K2201/0761—Insulation resistance, e.g. of the surface of the PCB between the conductors
-
- 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
- H05K2203/0779—Treatments involving liquids, e.g. plating, rinsing characterised by the specific liquids involved
- H05K2203/0786—Using an aqueous solution, e.g. for cleaning or during drilling of holes
- H05K2203/0796—Oxidant in aqueous solution, e.g. permanganate
-
- 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
- H05K3/388—Improvement of the adhesion between the insulating substrate and the metal by the use of a metallic or inorganic thin film adhesion layer
Definitions
- the present invention relates to a method for manufacturing a printed wiring board that is a material for electronic components such as TAB tape and COF tape, and a printed wiring board obtained by the manufacturing method.
- a method for manufacturing a printed wiring board that is a material for electronic components such as TAB tape and COF tape, and a printed wiring board obtained by the manufacturing method.
- predetermined etching it is possible to remove the metal residue between the wiring without side etching of the copper layer by an inexpensive and simple process, and a printed wiring that can form a pattern with sufficient insulation reliability even in a fine wiring processed product
- the present invention relates to a substrate manufacturing method and a printed wiring board obtained by the manufacturing method.
- a substrate used to produce a flexible wiring board is a three-layer flexible substrate in which a copper foil serving as a conductor layer is bonded onto an insulator film using an adhesive (for example, see Patent Document 1) And a two-layer flexible substrate in which a copper coating layer as a conductor layer is directly formed on the insulator film by a dry plating method or a wet plating method without using an adhesive.
- an electrolytic copper plating method is usually employed as a means for forming a copper coating layer having a uniform thickness on an insulator film. Then, in order to perform electro copper plating, a thin metal layer is formed on the insulator film to which the electro copper plating film is applied. In general, conductivity is imparted to the entire surface, and an electrolytic copper plating process is performed thereon (see, for example, Patent Document 2). Further, in order to obtain a thin metal layer on an insulator film, it is common to use a dry plating method such as a vacuum deposition method or an ion plating method.
- a Ni_Cr alloy layer is provided (see Patent Document 3).
- ferric chloride solution in which ferric chloride (FeCl) is dissolved in water is used as an etching solution.
- Etching is performed using a liquid.
- the etching residue of the base metal layer such as Ni—Cr alloy is generated between the wirings, and sufficient etching results may not be obtained.
- Patent Document 4 discloses that an acid etching solution containing hydrochloric acid or an excessive solution after etching with a ferric chloride solution or a cupric chloride solution containing hydrochloric acid is disclosed in Patent Document 4 as a measure for correcting the power and adverse effects. It has been proposed to dissolve the etching residue of Ni-Cr alloy by treating with one or more alkaline etching solutions such as potassium nganate solution. In this case, it is possible to remove the etching residue of the Ni_Cr alloy by a method with less side etching of the copper wiring.
- Patent Document 1 JP-A-6-132628
- Patent Document 2 Japanese Patent Laid-Open No. 8-139448
- Patent Document 3 JP-A-6-120630
- Patent Document 4 Japanese Patent Laid-Open No. 2005-23340
- the ferric chloride solution or an acidic etchant containing hydrochloric acid used after wiring formation with cupric chloride it is difficult to completely remove Cr, and the etching Since the solution contains about 10 to 20% by weight hydrochloric acid, it will dissolve copper as it is, so it must contain a certain amount of an inhibitor that suppresses dissolution of copper. For this reason, it was necessary to manage the copper concentration and the inhibitor concentration on a daily basis.
- treatment with an alkaline etching solution such as a permanganic acid solution is effective for removing Cr, but in order to use the etching solution, a treatment facility dedicated to alkali is required, and it is easy to use. It was difficult to increase the number of processes.
- alkaline etching solution such as a permanganic acid solution
- the object of the present invention is to solve the above-mentioned conventional problems in the production of a two-layer flexible wiring board, and to remove the metal residue between the wirings without side etching of the copper layer by an inexpensive and simple process.
- An object of the present invention is to provide a method for manufacturing a printed wiring board having sufficient insulation reliability even in a wiring processed product, and a printed wiring board obtained by the manufacturing method.
- the first invention of the present invention is a two-layer flexible film in which a base metal layer is formed directly on at least one surface of an insulator film without using an adhesive, and then a copper coating layer is formed on the base metal layer.
- the etching method is a step of etching the two-layer flexible substrate with a ferric chloride solution or a cupric chloride solution containing hydrochloric acid. And a step of treating with an acidic oxidant containing permanganate and acetic acid in the next V, and a method for producing a printed wiring board.
- a printed wiring board according to the first aspect, further comprising a step of removing the manganese compound with a manganese residue removing solution after the treatment step with the acidic oxidant. It is a manufacturing method.
- the base metal layer has at least one metal force selected from Ni, Cu, Mo, Ta, Ti, V, Cr, Fe, Co, and W, or two or more.
- a fourth invention of the present invention is characterized in that the oxidizing agent is a solution containing 0.05 to 10% by weight of permanganate and 0.05 to 20% by weight of acetic acid.
- the oxidizing agent is a solution containing 0.05 to 10% by weight of permanganate and 0.05 to 20% by weight of acetic acid.
- the insulator film comprises a polyimide film, a polyamide film, a polyester film, a polytetrafluoroethylene film, a polyphenylene sulfide film, a polyethylene naphthalate system.
- the sixth invention of the present invention is characterized in that the oxidizing agent contains 0.05 to 10% by weight of permanganate and 0.05 to 20% by weight of acetic acid. This etching solution is used in the method for producing a printed wiring board.
- a seventh invention of the present invention is a method for producing a printed wiring board according to the first to fifth inventions. It is the printed wiring board obtained by the method.
- wiring can be performed on a two-layer flexible board without side etching of the copper layer in an inexpensive and simple process. Since the metal residue between them can be removed, and a fine wiring having high insulation reliability can be obtained, the industrial effect is extremely large.
- the insulator film surface may be modified and activated by hydrazine treatment or plasma treatment to ensure bonding with the lower metal layer. Sometimes done. Since the bond strength obtained by this treatment is strong, it is considered that a peel strength that can withstand practical use is expressed as a two-layer flexible substrate.
- the metal component of the trace amount of the lower metal layer that is directly bonded to the insulator film Is considered to remain on the surface layer of the insulator film.
- the present inventors presume that the metal component remaining on the surface layer is one of the causes of migration when a constant temperature and humidity bias test (HHBT (High Temperature High Humidity Bias Test)) is performed. Les.
- HHBT High Temperature High Humidity Bias Test
- the present invention provides an etching method for a two-layer flexible substrate in which a base metal layer is formed directly on at least one surface of an insulator film without an adhesive and a copper coating layer is formed on the base metal layer.
- a step of etching the two-layer flexible substrate with a ferric chloride solution or a cupric chloride solution containing hydrochloric acid, and then the obtained two layers It comprises a step of treating the flexible substrate with an acidic etchant containing permanganate and acetic acid.
- a salt used after forming a wiring with a ferric chloride solution or cupric chloride When treated with an acidic etching solution containing acid, it is difficult to completely remove Cr, and since the etching solution contains about 10 to 20% by weight of hydrochloric acid, copper is dissolved as it is. Although a certain amount of an inhibitor that suppresses dissolution of copper is contained, it must be treated, and treatment with an alkaline etching solution such as a permanganate solution is effective for removing Cr, In order to use the etching solution, a processing facility dedicated to alkali is necessary, and in order to solve problems such as difficulty in increasing the number of processes easily, at least one surface of the insulating film has a base metal on at least one side.
- a pattern is formed by etching on a two-layer flexible board in which a layer is formed directly without an adhesive and a copper coating layer is formed on the underlying metal layer.
- a method of cleaning the etched surface with an acidic oxidizer containing permanganate and acetic acid after etching with a ferric solution or a cupric chloride solution containing hydrochloric acid is provided.
- Insulator films used as insulating substrate materials in the present invention are polyimide film, polyamide film, polyester film, polytetrafluoroethylene film, polyphenylene sulfide film, polyethylene naphthalate film, from the viewpoint of heat resistance. At least one thermosetting resin film selected from liquid crystal polymer film strength is preferred. Among them, a polyimide film and a polyamide film are particularly preferable films because they are suitable for applications that require high-temperature connection at a solder riff port.
- the insulator film having a film thickness of 8 to 75 m can be preferably used.
- inorganic materials such as glass fibers and CNTs can be appropriately added to the resin film.
- the material of the base metal layer formed on the insulator film is at least one metal force selected from Ni, Cu, Mo, Ta, Ti, V, Cr, Fe, Co, and W, or two or more Because it has a high corrosion resistance and high heat resistance with high adhesion preferable.
- a metal oxide of the base metal layer may be stacked on the base metal layer.
- the film thickness of the base metal layer of the printed wiring board of the present invention is preferably 3 to 50 nm.
- the etching solution penetrates into the wiring force, and the wiring peel strength floats. Further, if the film thickness is greater than 50 nm, it is difficult to perform etching, which is not preferable.
- a copper film layer is formed using a sputtering apparatus in which a copper target is mounted on a sputtering force sword.
- the base metal layer and the copper coating layer are preferably formed continuously in the same vacuum chamber.
- a copper coating layer is formed by a dry plating method and then a copper layer is formed on the copper coating layer by a wet plating method, for example, an electroless copper plating process is performed.
- an electroless copper plating process is performed.
- the thickness of the copper layer with the electroless copper plating solution can be repaired by pinholes on the substrate surface, and is dissolved by the copper plating solution when the electrolytic copper plating process is performed.
- a layer thickness of about / is sufficient, and it is preferably in the range of 0.01-1. ⁇ ⁇ ⁇ .
- the dry plating method methods such as resistance heating vapor deposition, ion plating vapor deposition, and sputtering vapor deposition can be used.
- a copper coating layer is further formed on the copper coating layer by a wet plating method. Laminating is suitable for forming a relatively thick film.
- the copper coating layer formed on the base metal layer A copper coating layer formed by a dry plating method and a copper coating layer laminated on the copper coating layer by a wet plating method can be formed.
- the film thickness of the copper coating layer which is a combination of the copper coating layer formed by the dry plating method and the copper coating layer laminated by the wet plating method on the copper coating layer, is 10 ⁇ to 35 ⁇ Is preferred. If it is thinner than lOnm, the copper coating layer formed by the dry soldering method becomes thin, which makes it difficult to supply power in the subsequent wet soldering process. Also, if it is thicker than 35 m, productivity is lowered, which is preferable.
- a base metal layer is directly formed on at least one surface of an insulating film, which is a commercially available thermosetting film, without using an adhesive, and a copper coating layer having a desired thickness is formed on the base metal layer.
- the insulator film usually contains moisture, and before the base metal layer is formed by the dry plating method, it is necessary to perform air drying and / or vacuum drying to remove the water present in the film. is there. If this is insufficient, the adhesion to the underlying metal layer will be poor.
- the method for forming the modified layer is not limited to chemical treatment with chemicals or physical treatment such as plasma treatment, corona discharge, or ultraviolet irradiation treatment.
- the base metal layer is formed by the dry plating method
- the base metal layer is formed using a trapping type sputtering apparatus
- an alloy target having the composition of the base metal layer is attached to the sputtering force sword.
- Ar gas was introduced and the apparatus was maintained at about 1.3 Pa.
- the insulator film mounted on the take-off roll in the device is being transported at a speed of about 3 m / min, power is supplied from the DC power source for sputtering connected to the force sword to start the sparking discharge.
- a base metal layer is continuously formed. By this film formation, a base metal layer having a desired thickness is formed on the film.
- a copper coating layer can be formed by a dry plating method using a sputtering apparatus in which a copper target is mounted on a snow suttering force sword.
- the base metal layer and the copper film layer are preferably formed continuously in the same vacuum chamber.
- an electroless copper plating treatment or a secondary plating is performed as a primary plating.
- wet plating methods such as electrolytic copper plating are combined.
- the electroless copper plating process is performed as the primary plating, and when dry plating is performed by vapor deposition, coarse pinholes may be formed, and the resin film is exposed on the surface. Therefore, by forming an electroless copper plating film on the entire surface of the substrate, the entire surface of the substrate can be made a good conductor by covering the exposed surface of the film, so that it is not affected by pinholes. It is to do.
- the electroless plating solution used for electroless plating is a reduction in which the metal ions contained are autocatalytic and are reduced by powerful reducing agents such as hydrazine, sodium phosphinate, formalin, etc.
- the main point of the present invention is to improve the conductivity of the exposed portion of the insulator film that is generated in the underlying metal layer and exposed by the pinhole. Therefore, an electroless copper plating solution with good conductivity and relatively good workability is optimal.
- the thickness of the copper plating film layer by electroless copper plating treatment as the primary plating is capable of repairing defects by pinholes on the substrate surface, and the copper plating as the secondary plating described later.
- the thickness may be such that it is not dissolved by the electrolytic copper plating solution when performing the plating treatment, and is preferably in the range of 0.01 to 1.0 / xm.
- the electrolytic copper plating process is performed as a secondary plating on the electroless copper plating film layer in order to form a copper coating layer having a desired thickness.
- a printed wiring board having a good and high adhesion degree of the conductor layer that is not affected by various large and small pinholes generated when the base metal layer is formed. Can be obtained.
- wet copper plating process performed in the present invention adopts various conditions in the conventional wet copper plating process for both the primary and secondary processes.
- a wiring pattern is individually formed on at least one surface of the two-layer flexible board to obtain a printed wiring board.
- via holes for interlayer connection can be formed at predetermined positions and used for various purposes.
- a high-density wiring pattern is individually formed on at least one surface of the flexible sheet.
- the via hole is filled with a conductive substance to make the hole conductive.
- a conventionally known method such as photo-etching can be used.
- a two-layer flexible substrate having a base metal layer and a copper coating layer formed on at least one surface is prepared, and After forming a photosensitive resist film by screen printing or laminating a dry film on the film, exposure and development are performed for patterning.
- the metal foil is selectively etched away with an etching solution, and then the resist is removed to form a predetermined wiring pattern.
- the two-layer flexible substrate is etched with a ferric chloride solution or a cupric chloride solution containing hydrochloric acid.
- the acidic oxidant containing permanganate and acetic acid is preferably 0.05 to: a solution containing 10 wt% permanganate and 0.05 to 20 wt% acetic acid.
- Etching when permanganate concentration is low The permanganate concentration is more preferably 0 :! to 5% by weight because the interval is delayed and the effect does not change even at high concentrations. Also, if the acetic acid concentration is low, the etching rate is slow and the etching time increases. Even if the acetic acid concentration is high, the effect does not change, so the acetic acid concentration is more preferably 1 to 10% by weight.
- the treatment method can be either a spray method or an immersion method.
- the treatment temperature of the acidic etching solution is preferably 20 ° C. to 60 ° C. If the temperature is low, the removal of the passive layer tends to be insufficient and the etching time becomes long. Further, since the generation of acetic acid odor increases when the temperature is high, the temperature is more preferably 30 ° C to 50 ° C.
- the treatment time of the permanganate etching solution containing acetic acid is preferably 30 seconds to 5 minutes. If it is shorter than 30 seconds, it is insufficient to remove the undissolved residue of the underlying metal layer, and the effect does not change even if it is longer than 5 minutes.
- manganese or the like may adhere to the etched surface and form a metal compound such as an oxide.
- an organic acid aqueous solution such as reductive oxalic acid or ascorbic acid or a commercially available manganese residue removal solution used to remove manganese residues in alkaline permanganate etching solution. I hope to do it.
- an acidic oxidizer containing permanganate and acetic acid again. It is preferable to carry out the treatment. By performing the treatment twice with the acidic oxidant containing permanganate and acetic acid sandwiched by the removal solution, and further three times, the base metal layer between the wirings The residue can be sufficiently removed.
- the permanganic acid solution alone does not dissolve Ni_Cr, and acetic acid alone has little effect.
- the acid added in the present invention is good if it is an acidic solution that dissolves Ni-Cr and does not cause poor insulation (connection failure), and only stops dissolving copper wiring in a range. It will be.
- this method has the effect of dissolving Ni-Cr for the first time by the combination of permanganate and acetic acid.
- the concentration of acetic acid is adjusted to 0.05 to 20% by weight to dissolve Cu. Since there is almost no solution, it is suitable as a method for removing the metal residue remaining between the wirings in the two-layer flexible substrate.
- fine wiring processing without thinning the leads can be performed by side-etching the copper layer.
- a two-layer flexible board having a copper coating layer formed on both sides and pattern the both sides to form a wiring pattern on both sides of the board. .
- the entire wiring pattern is divided into several wiring areas depends on the wiring density distribution of the wiring pattern.
- the wiring pattern is divided into a high-density wiring area with a wiring width and wiring spacing of 50 ⁇ m or less, and others.
- the wiring area is divided into two areas, and considering the thermal expansion difference with the printed circuit board and the convenience of handling, the size of the wiring board to be divided is set to about 10 to 65 mm 'and divided appropriately.
- the via hole As a method for forming the via hole, a conventionally known method can be used. For example, the wiring pattern and the flexible sheet are penetrated to a predetermined position of the wiring pattern by laser processing, photoetching, or the like. Form a via hole.
- the diameter of the via hole is preferably 100 ⁇ m or less, and preferably 50 / z m or less, preferably within a range that does not hinder the conductivity in the hole.
- the via hole is filled with a conductive metal such as copper by plating, vapor deposition, sputtering, or the like, or a conductive paste is press-fitted and dried using a mask having a predetermined opening pattern, and the inside of the hole is dried. Conduction is made to make electrical connection between layers.
- a conductive metal such as copper by plating, vapor deposition, sputtering, or the like, or a conductive paste is press-fitted and dried using a mask having a predetermined opening pattern, and the inside of the hole is dried. Conduction is made to make electrical connection between layers.
- the conductive metal include copper, gold, and nickel.
- the N-to-Cr alloy films in Examples 1 to 5 and Comparative Examples 1 to 5 are polyimide film (made by Toray Dubon Co., Ltd., film thickness 50 / m) with 20 wt% alloy target (manufactured by Sumitomo Metal Mining). It is formed by a direct current sputtering method (sputtering apparatus: manufactured by Hirano Kotone Co., Ltd.) in a thickness range of 20 to 30 nm.
- the copper films in Examples 1 to 5 and Comparative Examples 1 to 5 are formed on a polyimide film in the range of 100 to 120 nm by a direct current sputtering method.
- a predetermined alloy film, metal film, or copper film was individually formed on the polyimide film because the alloy film, metal film, or copper film This is to evaluate the dissolution characteristics for each.
- a potassium permanganate aqueous solution was prepared by dissolving potassium permanganate in ion-exchanged water with the composition shown in the following table (Comparative Example 1).
- an acidic permanganate solution was prepared by adding acetic acid with the composition shown in the following table (Examples 1 to 5 and Comparative Example 1).
- Example 3, 4 Further, as in Comparative Example 1, after preparing an aqueous potassium permanganate solution, an alkaline permanganate solution was prepared by adding potassium hydroxide in the composition shown in the following table (Comparative Example 2).
- a commercially available acidic etching solution CH- 1920 manufactured by MEC Co., Ltd.
- the degree of dissolution of the Ni—Cr alloy film was “Yes J” when the Ni—Cr alloy was dissolved on the entire surface, and “No X dissolution” in the case of almost no change.
- each sample was dissolved in a solution consisting of 5 ml of nitric acid and 1 ml of hydrogen peroxide using a microwave digester.
- the metal component in each obtained solution was quantitatively analyzed with an inductively coupled plasma ion source mass spectrometer.
- the residual amounts of Ni and Cr are also shown in Table 1. It is acceptable if the total amount of Ni and Cr residues is 130 ngZcm 2 or less.
- the polyimide film on which the copper film was formed was immersed in an etching solution shown in Table 1 below at 40 ° C. for 5 minutes, washed with water for 20 seconds, and then the dissolution of the copper film was confirmed visually.
- the copper film is not dissolved, and it is desirable. Therefore, if the change in the copper film is almost impossible, “No dissolution” is indicated. If the copper film is dissolved, ⁇ X is dissolved. did.
- Example 1 For Example 1 and Comparative Examples 1 and 3, photographs showing the state of the film after immersion in each etching solution are shown in FIG. It can be seen that the presence or absence of dissolution can be visually observed.
- Example 1 in which the etching solution of the present invention was used, the Ni—Cr alloy could be dissolved quickly and the dissolution of the copper film was not observed.
- Comparative Examples 1 and 3 although the dissolution of the copper film was not recognized, the deviation and misalignment could dissolve the Ni-Cr alloy.
- Example 7 In the same manner as in Example 6, a 30 wt% _1 ⁇ alloy metal film was formed by direct current sputtering using a 30 wt% 0: —Ni alloy target (manufactured by Sumitomo Metal Mining). An evaluation sample having a polyimide film force of 50 mm ⁇ 50 mm on which the obtained alloy film was formed was cut out. When an aqueous solution prepared with 1% by weight of potassium permanganate and 5% by weight of acetic acid was heated to 40 ° C, the evaluation sample was immersed for 2 minutes and the degree of dissolution of the alloy film was visually confirmed. Was dissolved.
- Example 6 In the same manner as in Example 6, a 40 wt% -Ni alloy target (manufactured by Sumitomo Metal Mining) was used, and a 40 wt% -alloy metal film was formed by DC sputtering. An evaluation sample having a polyimide film force of 50 mm ⁇ 50 mm on which the obtained alloy film was formed was cut out. When an aqueous solution prepared with 1% by weight of potassium permanganate and 5% by weight of acetic acid was heated to 40 ° C, the evaluation sample was immersed for 2 minutes and the degree of dissolution of the alloy film was visually confirmed. Was dissolved.
- Example 6 In the same manner as in Example 6, a 100 wt% target (manufactured by Sumitomo Metal Mining) was used, and a 100 wt% 0: metal film was formed by direct current sputtering. A 50 mm ⁇ 50 mm evaluation sample was cut out from the polyimide film on which the metal film was formed. When an aqueous solution prepared with 1% by weight of permanganate and 5% by weight of acetic acid was heated to 40 ° C, the evaluation sample was immersed for 2 minutes and the degree of dissolution of the alloy film was visually confirmed. Dissolution of the membrane was observed.
- a 100 wt% target manufactured by Sumitomo Metal Mining
- Example 6 In the same manner as in Example 6, a 16.5 wt% Cr to 17 wt% Mo-Ni alloy target (manufactured by Sumitomo Metal Mining) was used, and a 16.5 wt% Cr-17 A weight% Mo—Ni alloy metal film was formed. A 50 mm ⁇ 50 mm evaluation sample was cut out from the polyimide film on which the obtained alloy film was formed. 1 weight of potassium permanganate. / 0 , an aqueous solution prepared with 5% by weight acetic acid was heated to 40 ° C, the evaluation sample was immersed for 2 minutes, and the degree of dissolution of the alloy film was visually confirmed. It was.
- Fig. 2 shows photographs of films taken before and after being immersed in an etching solution for Examples 8, 10, 13, and 16. In any case, it was visually observed that the alloy film was dissolved after etching, and it was confirmed that the alloy film was rapidly dissolved using the etching solution of the present invention.
- the etching solution used in Examples 6 to 16 was an acidic permanganate solution prepared in Example 1, and dissolution of the copper film was not observed.
- the ferric chloride solution of the conventional two-layer flexible substrate is inexpensive and simple. Or fine wiring with high insulation resistance without side etching or damage because the remainder of the underlying metal layer component after etching with a salt copper cupric acid solution containing hydrochloric acid can be dissolved quickly and copper etching can be suppressed. Is easily obtained and its effect is extremely large.
- FIG. 1 is an external view showing the degree of dissolution of a Ni—Cr alloy sputtering film and a Cu sputtering film for some examples and comparative examples.
- FIG. 2 is an external view showing the degree of dissolution before and after etching of the alloy sputtering film in the example of the part.
Abstract
Description
Claims
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JP2008556604A JP4986082B2 (ja) | 2007-09-10 | 2008-06-23 | プリント配線基板の製造方法 |
KR1020097026616A KR101156414B1 (ko) | 2007-09-10 | 2008-06-23 | 프린트 배선 기판의 제조 방법 및 이 제조 방법에 의해 얻어진 프린트 배선 기판 |
US12/733,105 US8465656B2 (en) | 2007-09-10 | 2008-06-23 | Method for manufacturing a printed circuit board and a printed circuit board obtained by the manufacturing method |
CN2008800222673A CN101690429B (zh) | 2007-09-10 | 2008-06-23 | 印刷布线基板的制造方法及由该制造方法所得的印刷布线基板 |
TW097125649A TWI436707B (zh) | 2007-09-10 | 2008-07-08 | A method of manufacturing a printed wiring board, and a printed wiring board obtained from the manufacturing method |
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JP2011100846A (ja) * | 2009-11-05 | 2011-05-19 | Sumitomo Metal Mining Co Ltd | 2層フレキシブル基板とその製造方法、2層フレキシブル配線板とその製造方法並びにプラズマ処理装置 |
JP2017502471A (ja) * | 2013-12-31 | 2017-01-19 | ビーワイディー カンパニー リミテッド | 信号収集アセンブリおよび該信号収集アセンブリを備えるパワーバッテリモジュール |
CN112867268A (zh) * | 2021-01-05 | 2021-05-28 | 中山国昌荣电子有限公司 | 一种覆铜板减铜工艺 |
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US20090289032A1 (en) * | 2008-05-23 | 2009-11-26 | General Electric Company | Method and kit for surface preparation |
JP5156784B2 (ja) * | 2010-03-30 | 2013-03-06 | Jx日鉱日石金属株式会社 | プリント配線板用銅箔及びそれを用いた積層体 |
JP5521130B1 (ja) * | 2012-08-30 | 2014-06-11 | パナソニック株式会社 | 電子部品パッケージおよびその製造方法 |
WO2014038128A1 (ja) | 2012-09-05 | 2014-03-13 | パナソニック株式会社 | 半導体装置およびその製造方法 |
CN114293056B (zh) * | 2021-12-20 | 2022-12-23 | 富联裕展科技(深圳)有限公司 | 金属工件、金属制品、蚀刻液以及金属工件的制作方法 |
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US8465656B2 (en) | 2013-06-18 |
JPWO2009034764A1 (ja) | 2010-12-24 |
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