WO2016194972A1 - プリント配線板用原板及びプリント配線板、並びにプリント配線板用原板の製造方法 - Google Patents
プリント配線板用原板及びプリント配線板、並びにプリント配線板用原板の製造方法 Download PDFInfo
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- WO2016194972A1 WO2016194972A1 PCT/JP2016/066260 JP2016066260W WO2016194972A1 WO 2016194972 A1 WO2016194972 A1 WO 2016194972A1 JP 2016066260 W JP2016066260 W JP 2016066260W WO 2016194972 A1 WO2016194972 A1 WO 2016194972A1
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- WO
- WIPO (PCT)
- Prior art keywords
- metal
- printed wiring
- resin film
- wiring board
- metal layer
- Prior art date
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Images
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
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/09—Use of materials for the conductive, e.g. metallic pattern
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
- B32B15/088—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyamides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/09—Use of materials for the conductive, e.g. metallic pattern
- H05K1/092—Dispersed materials, e.g. conductive pastes or inks
- H05K1/097—Inks comprising nanoparticles and specially adapted for being sintered at low temperature
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/02—Apparatus or processes for manufacturing printed circuits in which the conductive material is applied to the surface of the insulating support and is thereafter removed from such areas of the surface which are not intended for current conducting or shielding
- H05K3/022—Processes for manufacturing precursors of printed circuits, i.e. copper-clad substrates
-
- 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
-
- 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
- H05K3/381—Improvement of the adhesion between the insulating substrate and the metal by special treatment of the substrate
-
- 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
-
- 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
- H05K3/46—Manufacturing multilayer circuits
- H05K3/4644—Manufacturing multilayer circuits by building the multilayer layer by layer, i.e. build-up multilayer circuits
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
- B32B2307/202—Conductive
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2457/00—Electrical equipment
- B32B2457/08—PCBs, i.e. printed circuit boards
-
- 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 or 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
- H05K2201/03—Conductive materials
- H05K2201/0332—Structure of the conductor
- H05K2201/0335—Layered conductors or foils
- H05K2201/0344—Electroless sublayer, e.g. Ni, Co, Cd or Ag; Transferred electroless sublayer
-
- 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
- H05K2203/0756—Uses of liquids, e.g. rinsing, coating, dissolving
- H05K2203/0766—Rinsing, e.g. after cleaning or polishing a conductive pattern
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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
- 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
- H05K2203/0793—Aqueous alkaline solution, e.g. for cleaning or etching
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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
- H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
- H05K2203/09—Treatments involving charged particles
- H05K2203/095—Plasma, e.g. for treating a substrate to improve adhesion with a conductor or for cleaning holes
Definitions
- the present invention relates to a printed wiring board original plate, a printed wiring board, and a method for manufacturing a printed wiring board original plate.
- a metal layer formed of, for example, metal is laminated on the surface of an insulating resin film formed of resin or the like, and a conductive pattern is formed by etching this metal layer to obtain a printed wiring board A printed circuit board is widely used.
- a metal thin film layer and a resin are formed by forming a copper thin film layer on the surface of the resin film using, for example, a sputtering method, and forming a copper thick film layer thereon using an electroplating method.
- a technique for increasing the adhesion between the film and the film is known.
- a printed wiring board original plate is a printed wiring board original plate including a resin film and a metal layer laminated on at least one surface of the resin film, the metal layer of the resin film
- the laminated surface has a modified layer having a composition different from that of the other portion, and the modified layer contains a metal, a metal ion, or a metal compound different from the main metal of the metal layer.
- the method for producing a printed wiring board original plate includes a step of forming a modified layer having a composition different from that of the other portion by an alkali solution containing metal ions on the surface of the resin film, A step of rinsing the resin film after the modified layer forming step, and a step of laminating a metal different from the metal ions of the alkaline liquid on the resin film after the rinsing step, in the rinsing step, in the modified layer Metal ions remain.
- FIG. 1 is a schematic cross-sectional view showing a printed wiring board original plate according to an embodiment of the present invention.
- FIG. 2 is a schematic cross-sectional view showing a detailed configuration example of a printed wiring board original plate according to an embodiment of the present invention.
- the printed wiring board master and the printed wiring board master manufactured by the method for manufacturing a printed wiring board master according to one aspect of the present invention are relatively inexpensive and have excellent adhesion between the metal layer and the resin film. .
- a printed wiring board original plate is a printed wiring board original plate including a resin film and a metal layer laminated on at least one surface of the resin film, the resin film
- the metal layer lamination surface has a modified layer having a composition different from that of the other portion, and the modified layer contains a metal, a metal ion, or a metal compound different from the main metal of the metal layer.
- the printed wiring board original plate has a modified layer having a composition different from that of other portions on the metal layer lamination surface of the resin film, so that the adhesion between the metal layer and the resin film can be improved relatively inexpensively.
- the modified layer contains a metal, metal ion, or metal compound that is different from the main metal of the metal layer, thereby preventing the main metal of the metal layer from being dispersed in the modified layer due to the presence of different metal elements. Can do.
- the said original board for printed wiring boards can maintain the state with the large contact
- the content of the metal element derived from the metal, metal ion or metal compound on the surface of the modified layer is preferably 0.2 atomic% or more and 10 atomic% or less.
- the content of the metal element derived from the metal, metal ion, or metal compound on the surface of the modified layer is within the above range, the adhesion between the metal layer and the resin film is improved and maintained more reliably. be able to.
- the metal constituting the metal, metal ion, or metal compound may be an alkali metal or an alkaline earth metal.
- the metal constituting the metal, metal ion, or metal compound is an alkali metal or an alkaline earth metal, these metals can be introduced into the resin film relatively easily using an alkali solution in which the metal is ionized. it can.
- the modified layer of the resin film may be formed by alkali treatment on the resin film.
- the modification layer of the resin film is formed by alkali treatment on the resin film, thereby improving the adhesion between the metal layer and the resin film, and the main metal of the metal layer is in the modification layer. It is possible to simultaneously introduce a different metal element that suppresses dispersion into the resin film.
- the main component of the resin film is preferably polyimide.
- the resin film has sufficient insulation and mechanical strength.
- the main metal of the metal layer may be copper.
- the main metal of the metal layer is copper that is relatively easily dispersed in the resin film, the effect of maintaining the adhesion by introducing the different metal element into the resin film becomes remarkable.
- the metal layer may be formed by applying and heating ink containing metal particles. Since the metal layer is formed by application of ink containing metal particles and heating, it is relatively easy to manufacture the printed wiring board original plate.
- the printed wiring board which concerns on another aspect of this invention is a printed wiring board which has a conductive pattern, Comprising: The said conductive pattern is formed in the metal layer of the said original board for printed wiring boards.
- the conductive pattern formed from the metal layer is hardly peeled off from the resin film while being relatively inexpensive.
- the conductive pattern is preferably formed by using a subtractive method or a semi-additive method on the metal layer of the printed wiring board original plate.
- the content of the metal layer different from the main metal on the surface of the modified layer exposed from the conductive pattern is preferably 1.5 atomic% or less.
- the content rate on the surface of the modified layer exposed from the conductive pattern of the metal element different from the main metal is equal to or less than the above upper limit, a short circuit due to migration hardly occurs.
- the manufacturing method of the printed wiring board original plate which concerns on another aspect of this invention forms the modified layer from which another part differs in composition with the alkali liquid containing a metal ion on the surface of a resin film.
- the method for producing a printed wiring board original plate can improve the adhesion between the metal layer and the resin film at a relatively low cost by forming the modified layer with an alkaline solution.
- the method for manufacturing the printed wiring board master plate is different in that the main metal of the metal layer is dispersed in the modified layer by leaving the metal ions of the alkaline liquid in the modified layer in the water washing step. It can be suppressed by the presence of elements.
- the manufacturing method of the said board for printed wiring boards can manufacture the board for printed wiring boards excellent in the adhesive force between a metal layer and a resin film comparatively cheaply.
- the “main metal” means a metal having the largest mass content, preferably 50% by mass or more, more preferably 80% by mass or more.
- the “element content” is, for example, X-ray photoelectron spectroscopy (ESCA: Electron Spectroscopy for Chemical Analysis or XPS: X-ray Photoelectron Spectroscopy), Energy Dispersive X-ray Spectroscopy (EDX: EnergeticSpis- sityX).
- EDS Energy Dispersive X-ray Spectroscopy, Electron Probe Micro-Analysis Method (EPMA: Electron Probe Micro Analysis), Time-of-Flight Secondary Ion Mass Spectroscopy (TOF-SIMS) y), secondary ion mass spectrometry (SIMS: Secondary Ion Mass Spectrometry), Auger electron spectroscopy (AES: can be measured by Auger Electron Spectroscopy) and the like.
- X-ray photoelectron spectroscopy measurement is performed by scanning the surface with the X-ray source being an aluminum metal K alpha ray, a beam diameter of 50 ⁇ m, and an X-ray incident angle of 45 ° with respect to the analysis surface. Can do.
- the measuring device for example, a scanning X-ray photoelectron spectroscopic analyzer “Quantera” manufactured by ULVAC-Phi can be used.
- the “element content on the surface of the modified layer” is an average value measured for the peeled surface of the resin film and the peeled surface of the resin film attached to the metal layer.
- [Original printed circuit board] 1 includes a resin film 2 and a metal layer 3 laminated on one surface (metal layer lamination surface) of the resin film 2.
- the resin film 2 has a modified layer 4 having a composition different from that of other portions on the metal layer lamination surface and improved adhesion to the metal layer 3.
- the material for the resin film 2 examples include flexible resins such as polyimide, liquid crystal polymer, fluororesin, polyethylene terephthalate, and polyethylene naphthalate, paper phenol, paper epoxy, glass composite, glass epoxy, polytetrafluoroethylene, and glass. It is possible to use a rigid material such as a base material, a rigid flexible material in which a hard material and a soft material are combined, and the like. Among these, polyimide is particularly preferable because of its high bonding strength with metal oxides and the like, and excellent insulation and mechanical strength.
- the thickness of the resin film 2 is set by a printed wiring board using the printed wiring board original plate 1 and is not particularly limited.
- the lower limit of the average thickness of the resin film 2 is preferably 5 ⁇ m, preferably 12 ⁇ m. More preferred.
- the upper limit of the average thickness of the resin film 2 is preferably 2 mm, and more preferably 1.6 mm.
- the average thickness of the resin film 2 is less than the said minimum, there exists a possibility that the intensity
- the average thickness of the resin film 2 exceeds the upper limit, the printed wiring board original plate may be unnecessarily thick.
- the modified layer 4 includes a metal, a metal ion, or a metal compound that is different in composition from the other portions of the resin film 2 and different from the main metal of the metal layer 3.
- composition is different from other parts of the resin film 2 means that, for example, when the content ratio of the element is different due to substitution or addition of a functional group to the molecular chain of the resin, when the linear chain of the molecule is cut, This includes the case where the structure is opened. Although the reason is not clear, it is considered that the adhesion to the metal layer 3 is improved due to the increased reactivity of the resin due to the structural change as exemplified.
- the modified layer 4 contains a metal, a metal ion, or a metal compound different from the main metal of the metal layer 3, so that these metal elements (hereinafter sometimes referred to as different metal elements) It functions to inhibit the main metal element from diffusing into the resin film 2. Thereby, the printed wiring board original plate 1 can maintain a state in which the adhesive force between the resin film 2 and the metal layer 3 is large.
- the dissimilar metal element is preferably chemically bonded to the components constituting the resin film 2.
- the dissimilar metal element is fixed in the resin film 2, and the diffusion of the main metal of the metal layer 3 into the resin film 2 is more effectively suppressed. can do.
- the chemical bond between the dissimilar metal element and the component constituting the resin film 2 can be confirmed by, for example, X-ray photoelectron spectroscopy (ESCA).
- Such a modified layer 4 is preferably formed by a hydrophilic treatment and a metal introduction treatment.
- this hydrophilic treatment for example, plasma treatment for irradiating plasma to make the surface hydrophilic, alkali treatment for making the surface hydrophilic with an alkaline liquid, or the like can be employed.
- transduction process the process which a resin film 2 is impregnated to the resin film 2 by immersing the resin film 2 in the solution containing a different metal element, its metal ion, or a metal compound, for example can be employ
- the dissimilar metal element is fixed in the resin film 2 by chemical bonding as described above, and the resin film of the main metal of the metal layer 3 is fixed. 2 can be more effectively suppressed.
- the resin film 2 contains polyimide as a main component, a different metal element can be chemically bonded and fixed to a carboxyl group formed by opening an imide ring by alkali treatment.
- the modified layer 4 formed by alkali treatment may contain a component of an alkaline liquid other than the different metal element, for example, a compound having a hydroxyl group derived from the alkaline liquid.
- the component of the alkaline liquid may be present by being bonded to the resin or additive constituting the resin film 2, and is deposited in the resin film 2 in the form of, for example, a metal hydroxide bonded to a different metal element. Also good.
- the component of the alkaline liquid present in the modified layer 4 contributes to hydrophilicity and fixing of the different metal element, and can improve the adhesion between the modified layer 4 and the metal layer 3.
- the resin film 2 is subjected to a hydrophilization treatment to form the modified layer 4 so that the resin film 2 with respect to the ink can be formed. Since the surface tension becomes small, it becomes easy to uniformly apply the ink to the resin film 2.
- the dissimilar metal element contained in the modified layer 4 is not particularly limited, but a metal that is ionized and ionized in an aqueous solution is preferable so that it can be introduced into the modified layer 4 using an aqueous solution.
- the metal that is ionized in the aqueous solution is not particularly limited, but an alkali metal or an alkaline earth metal is preferable, and sodium, potassium, and calcium that are easily ionized at low cost are particularly preferable.
- an alkali metal or an alkaline earth metal as the foreign metal element, the foreign metal element can be introduced into the modified layer 4 of the resin film 2 relatively easily.
- the lower limit of the content of the dissimilar metal element on the surface of the modified layer 4 is preferably 0.2 atomic%, more preferably 0.5 atomic%, and even more preferably 1 atomic%.
- the upper limit of the content of the dissimilar metal element on the surface of the modified layer 4 is preferably 10 atomic%, more preferably 9 atomic%, and even more preferably 5 atomic%.
- the metal layer 3 may have a single layer structure or a multilayer structure.
- the metal layer 3 includes a first metal layer 5 laminated on the surface of the resin film 2 by sintering a plurality of metal particles, and a surface on the surface of the first metal layer 5. It can be set as the structure which has the 2nd metal layer 6 laminated
- a metal oxide based on the metal or a group derived from the metal oxide and a metal hydroxide based on the metal or A group in which a group derived from the metal hydroxide is generated is preferable.
- copper (Cu), nickel (Ni), aluminum (Al), gold (Au), silver (Ag), or the like can be used.
- copper is suitably used as a relatively inexpensive metal that has good conductivity and excellent adhesion to the resin film 2 and that can be easily patterned by etching.
- the main metal of the metal layer 3 is copper, the effect of suppressing the decrease in adhesion due to the presence of the dissimilar metal element in the modified layer 4 becomes significant.
- the first metal layer 5 is formed on one surface of the resin film 2 by applying and heating ink containing a plurality of metal particles whose main component is the metal that is the main metal of the metal layer 3 on the surface of the modified layer 4. It is formed by laminating.
- the 1st metal layer 5 can be formed in one surface of the resin film 2 easily and cheaply by using the ink containing a metal particle.
- the lower limit of the average particle diameter of the metal particles forming the first metal layer 5 is preferably 1 nm, and more preferably 30 nm.
- the upper limit of the average particle diameter of the metal particles is preferably 500 nm, and more preferably 100 nm.
- the average particle diameter of the metal particles is less than the lower limit, for example, the dispersibility and stability of the metal particles in the ink may be reduced, so that it may not be easy to uniformly laminate the resin film 2 on the surface. is there.
- the average particle diameter of the metal particles exceeds the above upper limit, the gap between the metal particles becomes large, and it may not be easy to reduce the porosity of the first metal layer 5.
- the “average particle size” means a particle size at which the volume integrated value is 50% in the particle size distribution measured by the laser diffraction method.
- the lower limit of the average thickness of the first metal layer 5 in the case of forming by applying and heating ink containing metal particles is preferably 50 nm, and more preferably 100 nm.
- the upper limit of the average thickness of the first metal layer 5 is preferably 2 ⁇ m, and more preferably 1.5 ⁇ m.
- the second metal layer 6 is formed by laminating the same metal as the main metal of the metal particles forming the first metal layer 5 by performing electroless plating on the outer surface of the first metal layer 5.
- the second metal layer 6 is formed so as to be impregnated into the first metal layer 5. That is, the gaps between the metal particles forming the first metal layer 5 are filled with the main metal by electroless plating, thereby reducing the voids inside the first metal layer 5.
- the gap between the metal particles is reduced, thereby preventing the first metal layer 5 from being peeled off from the resin film 2 due to the gap as a starting point of fracture. it can.
- the second metal layer 6 may be formed only inside the first metal layer 5.
- the lower limit of the average thickness of the second metal layer 6 formed on the outer surface of the first metal layer 5 (not including the thickness of the plating metal inside the first metal layer 5) is 0.2 ⁇ m. Is preferable, and 0.3 ⁇ m is more preferable.
- the upper limit of the average thickness of the second metal layer 6 formed on the outer surface of the first metal layer 5 is preferably 1 ⁇ m, and more preferably 0.7 ⁇ m. When the average thickness of the second metal layer 6 formed on the outer surface of the first metal layer 5 is less than the lower limit, the second metal layer 6 is not sufficiently filled in the gap between the metal particles of the first metal layer 5.
- the porosity cannot be reduced sufficiently, the peel strength between the resin film 2 and the metal layer 3 may be insufficient.
- the average thickness of the second metal layer 6 formed on the outer surface of the first metal layer 5 exceeds the upper limit, the time required for electroless plating becomes longer, and the production cost may be unnecessarily increased. .
- the third metal layer 7 is formed by further laminating a main metal on the outer surface side of the first metal layer 5, that is, the outer surface of the second metal layer 6 by electroplating. With the third metal layer 7, the thickness of the metal layer 3 can be adjusted easily and accurately. In addition, the thickness of the metal layer 3 can be increased in a short time by using electroplating.
- the thickness of the 3rd metal layer 7 is set according to the kind and thickness of the conductive pattern which are required for the printed wiring board formed using the printed wiring board original plate 1, and is not specifically limited. .
- the lower limit of the average thickness of the third metal layer 7 is preferably 1 ⁇ m and more preferably 2 ⁇ m.
- the upper limit of the average thickness of the third metal layer 7 is preferably 100 ⁇ m, and more preferably 50 ⁇ m.
- the average thickness of the third metal layer 7 is less than the lower limit, the metal layer 3 may be easily damaged.
- the printed wiring board original plate 1 may be unnecessarily thick, or the printed wiring board original plate 1 may have insufficient flexibility. There is.
- the printed wiring board original plate 1 has a modified layer 4 having a composition different from that of other portions on the metal layer lamination surface of the resin film 2, so that the adhesion between the metal layer 3 and the resin film 2 can be relatively low. Can be improved.
- the modified layer 4 contains a metal, metal ion, or metal compound different from the main metal of the metal layer 3, the main metal of the metal layer 3 is dispersed in the modified layer 4 due to the presence of this different metal element. This can be suppressed. Therefore, the printed wiring board original plate 1 can maintain a state in which the adhesion between the metal layer 3 and the resin film 2 is large.
- the modified layer 4 is formed by bringing an alkaline liquid into contact with at least one surface of the resin film 2 by, for example, immersion.
- an alkaline aqueous solution containing ions of different metal elements introduced into the resin film 2 can be used.
- the alkaline aqueous solution containing ions of the different metal elements include a sodium hydroxide aqueous solution and a potassium hydroxide aqueous solution.
- the pH of the alkaline solution used in the modified layer forming step can be set to 12 or more and 15 or less, for example.
- the contact time of the resin film 2 with the alkaline liquid can be, for example, 15 seconds or more and 10 minutes or less.
- the temperature of the alkaline liquid can be set at, for example, 10 ° C. or more and 70 ° C. or less.
- ⁇ Washing process> In the water washing step, the resin film 2 is washed with water to remove the alkali solution adhering to the surface of the resin film 2, but ions of different metal elements in the alkali solution remain in the modified layer 4. In this washing step, it is preferable to leave components other than the ions of the different metal elements in the alkaline liquid, such as hydroxide ions, in the modified layer 4.
- the lower limit of the washing time is preferably 3 seconds and more preferably 5 seconds.
- the upper limit of the washing time is preferably 180 seconds, more preferably 100 seconds, and further preferably 50 seconds.
- the washing time is less than the lower limit, the alkaline liquid on the surface of the resin film 2 may not be sufficiently removed.
- the washing time exceeds the above upper limit, the dissimilar metal element cannot be left in the modified layer 4, and the effect of suppressing the diffusion of the main metal of the metal layer 3 into the resin film 2 may be insufficient. .
- the lower limit of the content of dissimilar metal elements is preferably 1 atomic%, and more preferably 2 atomic%.
- the upper limit of the content of the different metal element on the surface of the resin film 2 after the water washing step is preferably 10 atomic%, and more preferably 9 atomic%.
- the resin film 2 is sufficiently dried after the water washing.
- the ions of the different metal elements are stabilized by precipitation as a metal or metal oxide or bonding with the resin component of the resin film 2.
- the metal layer lamination step includes a step of forming the first metal layer 5 by applying and heating an ink containing a plurality of metal particles, a step of forming the second metal layer 6 by electroless plating, and a third metal by electroplating. Forming the layer 7.
- First metal layer forming step As the ink used in the first metal layer forming step, an ink containing a dispersion medium of metal particles and a dispersant for uniformly dispersing the metal particles in the dispersion medium is preferably used. By using the ink in which the metal particles are uniformly dispersed, the metal particles can be uniformly attached to the surface of the resin film 2, and the uniform first metal layer 5 can be formed on the surface of the resin film 2.
- the metal particles contained in the ink can be produced by a high temperature treatment method, a liquid phase reduction method, a gas phase method, etc., but are produced by a liquid phase reduction method that can produce particles having a uniform particle size at a relatively low cost. It is preferable to use one.
- the dispersant contained in the ink is not particularly limited, but a polymer dispersant having a molecular weight of 2,000 to 300,000 is preferably used.
- a polymer dispersant having a molecular weight in the above range the metal particles can be favorably dispersed in the dispersion medium, and the film quality of the obtained first metal layer 5 can be made dense and defect-free. it can.
- the molecular weight of the dispersant is less than the above lower limit, the effect of preventing the aggregation of the metal particles and maintaining the dispersion may not be sufficiently obtained. As a result, the first metal layer 5 laminated on the resin film 2 may be obtained. May not be able to be made dense with few defects.
- the molecular weight of the dispersant exceeds the above upper limit, the bulk of the dispersant is too large, and there is a possibility that voids are generated by inhibiting the sintering of the metal particles during heating performed after application of the ink.
- the volume of a dispersing agent is too large, there exists a possibility that the denseness of the film quality of the 1st metal layer 5 may fall, or the decomposition residue of a dispersing agent may reduce electroconductivity.
- the dispersant preferably contains no sulfur, phosphorus, boron, halogen and alkali from the viewpoint of preventing the deterioration of the parts.
- Preferred dispersants are those having a molecular weight in the above range, amine-based polymer dispersants such as polyethyleneimine and polyvinylpyrrolidone, and hydrocarbon-based hydrocarbons having a carboxylic acid group in the molecule such as polyacrylic acid and carboxymethylcellulose.
- Polar groups such as polymer dispersants, poval (polyvinyl alcohol), styrene-maleic acid copolymers, olefin-maleic acid copolymers, or copolymers having a polyethyleneimine moiety and a polyethylene oxide moiety in one molecule
- the polymer dispersing agent which has can be mentioned.
- the dispersant can also be added to the reaction system in the form of a solution dissolved in water or a water-soluble organic solvent.
- the content of the dispersant is preferably 1 part by mass or more and 60 parts by mass or less per 100 parts by mass of the metal particles.
- the dispersing agent surrounds the metal particles to prevent aggregation and disperse the metal particles satisfactorily. However, when the content of the dispersing agent is less than the lower limit, this aggregation preventing effect may be insufficient. On the contrary, when the content ratio of the dispersant exceeds the above upper limit, in the heating step after the application of the ink, there is a possibility that excessive dispersant may inhibit the sintering of the metal particles and generate voids. There is a possibility that the decomposition residue of the dispersant remains in the first metal layer 5 as an impurity and lowers the conductivity.
- the content ratio of water as a dispersion medium in the ink is preferably 20 parts by mass or more and 1900 parts by mass or less per 100 parts by mass of the metal particles.
- the water of the dispersion medium sufficiently swells the dispersing agent to satisfactorily disperse the metal particles surrounded by the dispersing agent.
- the content of water is less than the above lower limit, the swelling effect of the dispersing agent by water can be reduced. May be insufficient.
- the water content exceeds the above upper limit the metal particle ratio in the ink is reduced, and there is a possibility that a good first metal layer 5 having the necessary thickness and density cannot be formed on the surface of the resin film 2. is there.
- a variety of water-soluble organic solvents can be used as the organic solvent blended into the ink as necessary.
- specific examples thereof include alcohols such as methyl alcohol, ethyl alcohol, n-propyl alcohol, isopropyl alcohol, n-butyl alcohol, isobutyl alcohol, sec-butyl alcohol and tert-butyl alcohol, ketones such as acetone and methyl ethyl ketone,
- examples thereof include polyhydric alcohols such as ethylene glycol and glycerin and other esters, and glycol ethers such as ethylene glycol monoethyl ether and diethylene glycol monobutyl ether.
- the content ratio of the water-soluble organic solvent is preferably 30 parts by mass or more and 900 parts by mass or less per 100 parts by mass of the metal particles.
- the content ratio of the water-soluble organic solvent is less than the above lower limit, the effects of adjusting the viscosity and vapor pressure of the dispersion with the organic solvent may not be sufficiently obtained.
- the content ratio of the water-soluble organic solvent exceeds the above upper limit, the swelling effect of the dispersant due to water becomes insufficient, and the metal particles may aggregate in the ink.
- a conventionally known coating method such as a spin coating method, a spray coating method, a bar coating method, a die coating method, a slit coating method, a roll coating method, or a dip coating method may be used. It can. Further, for example, ink may be applied to only a part of the surface of the resin film 2 by screen printing, a dispenser, or the like.
- the ink coating film in which the ink is applied to the resin film 2 is heated.
- the solvent dispersant of the ink is evaporated or thermally decomposed, and the remaining metal particles are sintered and the first metal layer 5 fixed to one surface of the resin film 2 is obtained. It is preferable to dry the ink film before heating.
- Sintering is preferably performed in an atmosphere containing a certain amount of oxygen.
- the lower limit of the oxygen concentration in the atmosphere during sintering is preferably 1 volume ppm, and more preferably 10 volume ppm.
- the upper limit of the oxygen concentration is preferably 10,000 volume ppm, more preferably 1,000 volume ppm.
- the oxygen concentration is less than the lower limit, the amount of metal oxide generated in the vicinity of the interface of the first metal layer 5 decreases, and the adhesion between the resin film 2 and the first metal layer 5 may not be sufficiently improved.
- the oxygen concentration exceeds the above upper limit, the metal particles may be excessively oxidized and the conductivity of the first metal layer 5 may be reduced.
- the lower limit of the sintering temperature is preferably 150 ° C, more preferably 200 ° C.
- the upper limit of the sintering temperature is preferably 500 ° C and more preferably 400 ° C.
- the second metal layer 6 is formed by performing electroless plating on the outer surface of the first metal layer 5 laminated on one surface of the resin film 2 in the first metal layer forming step.
- electroless plating with processes, such as a cleaner process, a water washing process, an acid treatment process, a water washing process, a pre-dip process, an activator process, a water washing process, a reduction process, a water washing process, for example.
- processes such as a cleaner process, a water washing process, an acid treatment process, a water washing process, a pre-dip process, an activator process, a water washing process, a reduction process, a water washing process, for example.
- the second metal layer 6 is formed by electroless plating.
- the metal oxide and the like in the vicinity of the interface between the first metal layer 5 and the resin film 2 further increase, and the adhesion between the resin film 2 and the first metal layer 5 is increased. Becomes even larger.
- the temperature and oxygen concentration of the heat treatment after electroless plating can be the same as the heating temperature and oxygen concentration in the first metal layer forming step.
- the third metal layer 7 is laminated on the outer surface of the second metal layer 6 by electroplating.
- the thickness of the entire metal layer 3 is increased to a desired thickness.
- a conventionally known electroplating bath corresponding to a metal to be plated such as copper, nickel, silver or the like is used, and appropriate conditions are selected. Can be made to form.
- the printed wiring board original plate 1 having excellent adhesion between the metal layer 3 and the resin film 2 can be manufactured relatively inexpensively.
- the main metal of the metal layer 3 is dispersed in the modified layer 4 by leaving ions of different metal elements in the alkaline liquid remaining in the modified layer 4 in the water washing step. To suppress that. For this reason, according to the manufacturing method of the said printed wiring board original plate, the adhesive force between the metal layer 3 and the resin film 2 is large, and this printed wiring board original plate which does not fall easily is manufactured comparatively cheaply. can do.
- the printed wiring board is formed using the printed wiring board original plate 1.
- the printed wiring board is preferably formed using the printed wiring board original plate 1 and using a subtractive method or a semi-additive method. More specifically, the printed wiring board is manufactured by forming a conductive pattern by a subtractive method or a semi-additive method using the metal layer 3 of the printed wiring board original plate 1.
- a photosensitive resist is coated on one surface of the printed wiring board original plate 1, and patterning corresponding to the conductive pattern is performed on the resist by exposure, development, or the like. Subsequently, the metal layer 3 other than the conductive pattern is removed by etching using the patterned resist as a mask. Finally, by removing the remaining resist, a printed wiring board having a conductive pattern formed from the remaining portion of the metal layer 3 of the printed wiring board original plate 1 is obtained.
- a photosensitive resist is formed on one surface of the printed wiring board master 1 and an opening corresponding to the conductive pattern is patterned on the resist by exposure, development, or the like.
- a conductor layer is selectively laminated using the metal layer 3 exposed in the opening of the mask as a seed layer.
- the surface of the conductor layer and the metal layer 3 on which the conductor layer is not formed are removed by etching, whereby an additional conductor layer is formed on the remaining portion of the metal layer 3 of the printed wiring board original plate 1.
- a printed wiring board having a conductive pattern formed by laminating is obtained.
- the upper limit of the content rate on the surface of the modified layer 4 exposed from the conductive pattern of the different metal element different from the main metal of the metal layer 3 is preferably 1.5 atomic%, more preferably 1.0 atomic%. 0.5 atomic% is more preferable.
- the lower limit of the content rate on the surface of the modified layer 4 exposed from the conductive pattern of the different metal element is not particularly limited. When the content rate on the surface of the modified layer 4 exposed from the conductive pattern of different metal elements exceeds the upper limit, there is a possibility that a short circuit may occur due to migration of these metal elements when the printed wiring board is used.
- the printed wiring board is manufactured using the printed wiring board original plate 1, the adhesive force between the resin film 2 and the metal layer 3 is large, and the conductive pattern is difficult to peel off.
- the printed wiring board is formed by the general subtractive method or the semi-additive method using the printed wiring board original plate 1, it can be manufactured at a relatively low cost.
- Metal layers may be laminated on both sides of the resin film of the printed wiring board original plate.
- the modified layer should just be formed in the at least one metal layer lamination surface of the resin film.
- the metal layer may not have a multilayer structure, and one or two of the first metal layer, the second metal layer, and the third metal layer may be omitted. Further, in the printed wiring board original plate, another superposed metal layer may be laminated on the surface of the metal layer.
- the third metal layer may be formed of a metal different from the main metal, and the third metal layer in this case is interpreted as an overlapping metal layer.
- the main metal of the metal layer means the main metal of the metal layer in contact with the resin film.
- the first metal layer of the printed wiring board original plate may be laminated without applying ink containing metal particles and heating.
- a method for laminating a metal layer that does not use ink include, for example, thermocompression bonding of metal foil, metal lamination only by electroless plating and electroplating, metal deposition, and sputtering.
- the lower limit of the thickness of the first metal layer can be 1 nm, and the upper limit can be 1000 nm.
- the second metal layer may be laminated by a lamination method other than electroless plating, and the third metal layer may be laminated by a lamination method other than electroplating.
- a prototype No. of a printed wiring board original plate in which a modified layer is formed on the surface of a resin film and then a metal layer is laminated. 1-No. 11 was created. Prototype No. of these original printed circuit boards 1-No. For No. 11, the content (metal amount) of the metal element on the surface of the modified layer before laminating the metal layer was measured by ion chromatography (IC) and X-ray photoelectron spectroscopy (ESCA). In addition, prototype No. of printed circuit board original plate. 1-No. 11 metal layers were peeled, and the metal element content (metal content) on the peeled surface was measured by X-ray photoelectron spectroscopy (ESCA). In addition, prototype No.
- Kaneka's polyimide sheet “Apical NPI” (average thickness 25 ⁇ m) was used. This resin film is immersed in a 2.5 mol / L sodium hydroxide aqueous solution (pH of about 14) at 40 ° C. for 90 seconds to form a modified layer, and then immersed in pooled water for 6 seconds, followed by washing with water and drying. did. And on the surface of the modified layer formed on the resin film, copper is laminated by sputtering to form a first metal layer having an average thickness of 10 nm, and then copper is laminated by electrolytic copper plating to laminate a third metal layer.
- a printed wiring board original plate No. 1 was obtained. Note that a vacuum sputtering apparatus was used for the copper lamination by sputtering, and the sputtering conditions were a vacuum reach of 0.8 ⁇ 10 ⁇ 4 Pa, a sputtering pressure of 0.1 Pa, and a power of 13 kW.
- Original board for printed wiring board No. 3 was a printed circuit board original plate No. 3 except that the washing time was 9 seconds. 1 was prepared.
- Original board for printed wiring board No. 4 is a printed wiring board original plate No. 4 except that the washing time is 30 seconds. Created in the same way as 2.
- Original board for printed wiring board No. 5 was a printed circuit board original plate No. 5 except that the washing time was 60 seconds. Created in the same way as 2.
- Original board for printed wiring board No. 6 is a printed wiring board original plate No. 6 except that the washing time was 150 seconds. Created in the same way as 2.
- Original board for printed wiring board No. 7 is a printed wiring board original plate No. 7 except that the washing time was 150 seconds. 1 was prepared.
- Original board for printed wiring board No. 8 is a printed wiring board original plate No. 8 except that a 2.5 mol / L potassium hydroxide aqueous solution was used to form the modified layer. Created in the same way as 2.
- Original board for printed wiring board No. 9 is a printed circuit board original plate No. 9 except that a 2.5 mol / L calcium hydroxide aqueous solution was used to form the modified layer. Created in the same way as 2.
- Original board for printed wiring board No. 10 is a printed wiring board original plate No. 10 except that the washing time is 1 second. 1 was prepared.
- Original board for printed wiring board No. 11 is a printed wiring board original plate No. 1 except that the washing time is 300 seconds. 1 was prepared.
- the current value of the suppressor was 30 mA
- 10 mmol / L methanesulfonic acid was used as the eluent
- the sample injection amount was 25 ⁇ L
- the measurement was performed at a flow rate of 1.0 mL / min. This measured value was converted into an ion amount [ ⁇ g / cm 2 ] per unit area of the resin film.
- X-ray photoelectron spectroscopy Measurement of the amount of metal on the surface of the modified layer by X-ray photoelectron spectroscopy was performed using a scanning X-ray photoelectron spectrometer “Quantera” manufactured by ULVAC-Phi. Was 50 ⁇ m, and the X-ray incident angle with respect to the analysis surface was 45 °.
- peel strength The peel strength was measured by a method in accordance with JIS-K-6854-2 (1999) “Adhesive—Peeling adhesive strength test method—2 parts: 180 degree peeling” with a resin film as a flexible adherend.
- Table 1 summarizes the conditions for creating a prototype of a printed wiring board and a printed wiring board, measurement results of metal amount, measurement results of peel strength, and measurement results of insulation resistance in a migration test.
- 1-No. No. 10 has a relatively large peel strength, and in particular, it was confirmed that the decrease in peel strength after the weather resistance test was small compared to the peel strength before the weather resistance test. In addition, it was confirmed that when the content of the metal element on the surface of the modified layer exposed from the conductive pattern of the printed wiring board increases, the insulation resistance tends to decrease due to migration.
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- Inorganic Chemistry (AREA)
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Abstract
Description
特開2000-340911号公報に記載されている構成では、銅箔の表面にスパッタリング法を用いてクロムの薄膜を形成しているので、真空設備を必要とし、設備の建設、維持、運転等におけるコストが高くなる。また設備面において、基板のサイズを大きくすることに限界がある。
本発明の一態様に係るプリント配線板用原板、及びプリント配線板用原板の製造方法により製造されるプリント配線板用原板は、比較的安価で金属層と樹脂フィルムとの間の密着力に優れる。
(1)本発明の一態様に係るプリント配線板用原板は、樹脂フィルムと、この樹脂フィルムの少なくとも一方の面に積層される金属層とを備えるプリント配線板用原板であって、前記樹脂フィルムの金属層積層面に他の部分と組成の異なる改質層を有し、この改質層が前記金属層の主金属とは異なる金属、金属イオン又は金属化合物を含む。
以下、本発明の実施形態に係るプリント配線板用原板について図面を参照しつつ詳説する。
図1のプリント配線板用原板1は、樹脂フィルム2と、この樹脂フィルム2の一方の面(金属層積層面)に積層される金属層3とを備える。
樹脂フィルム2は、金属層積層面に他の部分と組成が異なり、金属層3との密着性を向上させた改質層4を有する。
改質層4は、樹脂フィルム2の他の部分と組成が異なると共に、金属層3の主金属とは異なる金属、金属イオン又は金属化合物を含む。
金属層3は、単層構造であってもよいが、多層構造であってもよい。例えば図2に示すように、金属層3は、複数の金属粒子を焼結することによって、樹脂フィルム2の表面に積層される第1金属層5と、この第1金属層5の表面に無電解めっきにより積層される第2金属層6と、この第2金属層6の表面に電気めっきによりさらに積層される第3金属層7とを有する構成とすることができる。
第1金属層5は、改質層4の表面に金属層3の主金属となる金属を主成分とする複数の金属粒子を含むインクを塗布及び加熱することによって、樹脂フィルム2の一方の面に積層して形成される。このように、金属粒子を含有するインクを用いることで、樹脂フィルム2の一方の面に容易かつ安価に第1金属層5を形成することができる。
第2金属層6は、第1金属層5の外面に無電解めっきを施すことにより、第1金属層5を形成する金属粒子の主金属と同一の金属を積層して形成される。また、第2金属層6は、第1金属層5の内部に含浸するよう形成されている。つまり、第1金属層5を形成する金属粒子間の隙間に無電解めっきにより主金属が充填されることにより、第1金属層5の内部の空隙を減少させている。無電解めっき金属が金属粒子間の隙間に充填されることによって、金属粒子間の空隙を減少させることで、空隙が破壊起点となって第1金属層5が樹脂フィルム2から剥離することを抑制できる。
第3金属層7は、第1金属層5の外面側、つまり第2金属層6の外面に電気めっきにより主金属をさらに積層することで形成される。この第3金属層7によって、金属層3の厚さを容易かつ正確に調節することができる。また、電気めっきを用いることにより、金属層3の厚さを短時間で大きくすることが可能である。
プリント配線板用原板1は、樹脂フィルム2の金属層積層面に他の部分と組成の異なる改質層4を有することによって、比較的安価に金属層3と樹脂フィルム2との間の密着力を向上できる。
当該プリント配線板用原板の製造方法は、樹脂フィルム2の表面に金属イオンを含有するアルカリ液によって他の部分と組成が異なる改質層4を形成する工程と、この改質層形成工程後の樹脂フィルム2を水洗する工程と、この水洗工程後の樹脂フィルム2にアルカリ液の金属イオンと異なる金属を主成分とする金属層3を積層する工程とを備える。
改質層形成工程では、例えば浸漬等により、樹脂フィルム2の少なくとも一方の面にアルカリ液を接触させることによって改質層4を形成する。
水洗工程では、樹脂フィルム2を水洗いして、樹脂フィルム2の表面に付着しているアルカリ液を除去するが、改質層4中にはアルカリ液中の異種金属元素のイオンを残留させる。また、この水洗工程では、改質層4中に、アルカリ液の異種金属元素のイオン以外の成分、例えば水酸化物イオン等を残留させることが好ましい。
金属層積層工程は、複数の金属粒子を含むインクの塗布及び加熱により第1金属層5を形成する工程と、無電解めっきにより第2金属層6を形成する工程と、電気めっきにより第3金属層7を形成する工程とを有する。
この第1金属層形成工程で用いるインクとしては、金属粒子の分散媒と、この分散媒中に金属粒子を均一に分散させる分散剤とを含むものが好適に使用される。均一に金属粒子が分散するインクを用いることで、樹脂フィルム2の表面に金属粒子を均一に付着させることができ、樹脂フィルム2の表面に均一な第1金属層5を形成することができる。
第2金属層形成工程では、第1金属層形成工程で樹脂フィルム2の一方の面に積層した第1金属層5の外面に、無電解めっきを施すことにより第2金属層6を形成する。
第3金属層形成工程では、第2金属層6の外面に、電気めっきによって第3金属層7を積層する。この第3金属層形成工程において、金属層3全体の厚さを所望の厚さまで増大させる。
当該プリント配線板用原板の製造方法では、真空設備を使用せずにアルカリ処理によって樹脂フィルム2に改質層を形成して、金属層3と樹脂フィルム2との間の密着力を向上させるため、比較的安価に金属層3と樹脂フィルム2との間の密着力に優れるプリント配線板用原板1を製造できる。
プリント配線板は、プリント配線板用原板1を用いて形成される。プリント配線板は、プリント配線板用原板1を用い、サブトラクティブ法又はセミアディティブ法を用いて形成されることが好ましい。より詳しくは、プリント配線板は、プリント配線板用原板1の金属層3を利用するサブトラクティブ法又はセミアディティブ法により導電パターンを形成することにより製造される。
当該プリント配線板は、プリント配線板用原板1を用いて製造したものなので、樹脂フィルム2と金属層3との密着力が大きく、導電パターンが剥離し難い。
今回開示された実施の形態は全ての点で例示であって制限的なものではないと考えられるべきである。本発明の範囲は、上記実施形態の構成に限定されるものではなく、請求の範囲によって示され、請求の範囲と均等の意味及び範囲内での全ての変更が含まれることが意図される。
また、プリント配線板用原板において、金属層の表面にさらに別の重畳金属層を積層して設けてもよい。例えば上記実施形態において第3金属層を主金属と異なる金属で形成してもよく、この場合の第3金属層は重畳金属層であると解釈される。換言すると、金属層の主金属とは、樹脂フィルムと接触している金属層の主金属を意味する。
また、第2金属層は無電解めっき以外の積層方法で積層されてもよく、第3金属層は電気めっき以外の積層方法で積層されてもよい。
樹脂フィルムとして、カネカ社のポリイミドシート「アピカルNPI」(平均厚さ25μm)を使用した。この樹脂フィルムを40℃の2.5mol/Lの水酸化ナトリウム水溶液(pH約14)に90秒浸漬して改質層を形成した後、溜め水に6秒浸漬することにより水洗してから乾燥した。そして、樹脂フィルムに形成した改質層の表面に、スパッタリングにより銅を積層して平均厚さ10nmの第1金属層を形成した後、電解銅めっきにより銅を積層して第3金属層を積層して平均合計厚さ20μmの金属層を形成することでプリント配線板用原板No.1を得た。なお、スパッタリングによる銅の積層には真空スパッタリング装置を用い、スパッタリングの条件としては、真空到達度を0.8×10-4Pa、スパッタリング圧を0.1Pa、電力を13kWとした。
プリント配線板用原板No.1と同様の樹脂フィルムに同様のアルカリ処理によって改質層を形成した後、溜め水に9秒浸漬することにより水洗してから乾燥した。そして、改質層の表面に、以下のようにして金属層を形成した。先ず、銅ナノインク(粒径80nmの銅粒子を26質量%含むインク)を塗布及び乾燥し、350℃の窒素雰囲気で2時間焼成して平均厚さ150nmの第1金属層を形成した。次に、無電解銅めっきにより平均合計厚さが0.5μmとなるよう銅を積層し、350℃の窒素雰囲気で2時間焼成して第2金属層を形成した。さらに、電解銅めっきにより銅を積層して第3金属層を積層することにより、平均合計厚さ20μmの金属層を形成して、プリント配線板用原板No.2を得た。
プリント配線板用原板No.3は、水洗時間を9秒とした以外はプリント配線板用原板No.1と同様に作成した。
プリント配線板用原板No.4は、水洗時間を30秒とした以外はプリント配線板用原板No.2と同様に作成した。
プリント配線板用原板No.5は、水洗時間を60秒とした以外はプリント配線板用原板No.2と同様に作成した。
プリント配線板用原板No.6は、水洗時間を150秒とした以外はプリント配線板用原板No.2と同様に作成した。
プリント配線板用原板No.7は、水洗時間を150秒とした以外はプリント配線板用原板No.1と同様に作成した。
プリント配線板用原板No.8は、改質層の形成に2.5mol/Lの水酸化カリウム水溶液を用いた以外はプリント配線板用原板No.2と同様に作成した。
プリント配線板用原板No.9は、改質層の形成に2.5mol/Lの水酸化カルシウム水溶液を用いた以外はプリント配線板用原板No.2と同様に作成した。
プリント配線板用原板No.10は、水洗時間を1秒とした以外はプリント配線板用原板No.1と同様に作成した。
プリント配線板用原板No.11は、水洗時間を300秒とした以外はプリント配線板用原板No.1と同様に作成した。
イオンクロマトグラフによる改質層表面の金属量の測定は、水洗後の樹脂フィルムを幅3cm、長さ4cmに切り出し、20mLの超純水中に投入して温度80℃で1時間抽出した水溶液を試料とし、サーモフィッシャーサイエンティフィック社のイオンクロマトグラフ「ICS-3000」を使用しておこなった。測定には、サーモフィッシャーサイエンティフィック社のイオン分離カラム「IonPac-CS14」及びサーモフィッシャーサイエンティフィック社のサプレッサー「CERS-500」を使用した。測定条件としては、サプレッサーの電流値を30mAとし、溶離液として10mmol/Lのメタンスルホン酸を用い、サンプル注入量を25μLとして、流量1.0mL/minで測定した。この測定値を樹脂フィルムの単位面積当たりのイオン量[μg/cm2]に換算した。
X線光電子分光法による改質層表面の金属量の測定は、ULVAC-Phi社製の走査型X線光電子分光分析装置「Quantera」を用い、X線源をアルミニウム金属のKアルファ線、ビーム径を50μm、分析表面に対するX線入射角度を45°としておこなった。
耐候性試験としては、プリント配線板用原板を150℃で7日間保持した。
剥離強度は、樹脂フィルムをたわみ性被着材としてJIS-K-6854-2(1999)「接着剤-はく離接着強さ試験方法-2部:180度はく離」に準じた方法により測定した。
温度85℃、湿度85%の雰囲気中で、導電パターンの隣接する線間に線間隔1μmあたり1Vの電圧(線間の電界強度が1V/μm)を印加し続け、500時間経過時の線間の電気抵抗(絶縁抵抗)を測定した。
2 樹脂フィルム
3 金属層
4 改質層
5 第1金属層
6 第2金属層
7 第3金属層
Claims (10)
- 樹脂フィルムと、この樹脂フィルムの少なくとも一方の面に積層される金属層とを備えるプリント配線板用原板であって、
前記樹脂フィルムの金属層積層面に他の部分と組成の異なる改質層を有し、
この改質層が前記金属層の主金属とは異なる金属、金属イオン又は金属化合物を含むプリント配線板用原板。 - 前記改質層表面における前記金属、金属イオン又は金属化合物に由来する金属元素の含有率が、0.2atomic%以上10atomic%以下である請求項1に記載のプリント配線板用原板。
- 前記金属、金属イオン又は金属化合物を構成する金属が、アルカリ金属又はアルカリ土類金属である請求項1又は請求項2に記載のプリント配線板用原板。
- 前記樹脂フィルムの改質層が、樹脂フィルムへのアルカリ処理により形成されている請求項1から請求項3のいずれか1項に記載のプリント配線板用原板。
- 前記樹脂フィルムの主成分がポリイミドである請求項1から請求項4のいずれか1項に記載のプリント配線板用原板。
- 前記金属層の主金属が銅である請求項1から請求項5のいずれか1項に記載のプリント配線板用原板。
- 前記金属層が金属粒子を含むインクの塗布及び加熱により形成されている請求項1から請求項6のいずれか1項に記載のプリント配線板用原板。
- 導電パターンを有するプリント配線板であって、
前記導電パターンが、請求項1から請求項7のいずれか1項に記載のプリント配線板用原板の金属層に形成されているプリント配線板。 - 前記主金属とは異なる金属元素の前記導電パターンから露出する改質層の表面における含有率が1.5atomic%以下である請求項8に記載のプリント配線板。
- 樹脂フィルムの表面に金属イオンを含有するアルカリ液によって他の部分と組成が異なる改質層を形成する工程と、
前記改質層形成工程後の樹脂フィルムを水洗する工程と、
前記水洗工程後の樹脂フィルムに前記アルカリ液の金属イオンと異なる金属を積層する工程と
を備え、
前記水洗工程において、改質層中に金属イオンを残留させるプリント配線板用原板の製造方法。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US15/572,506 US10225931B2 (en) | 2015-06-04 | 2016-06-01 | Substrate for printed circuit board, printed circuit board, and method for producing substrate for printed circuit board |
CN201680032484.5A CN107615898B (zh) | 2015-06-04 | 2016-06-01 | 印刷线路板用基板、印刷线路板以及印刷线路板用基板的制造方法 |
JP2017522221A JP6760933B2 (ja) | 2015-06-04 | 2016-06-01 | プリント配線板用原板及びプリント配線板、並びにプリント配線板用原板の製造方法 |
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Cited By (4)
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JP2019114679A (ja) * | 2017-12-25 | 2019-07-11 | 住友電気工業株式会社 | プリント配線板用基材 |
JP2019140280A (ja) * | 2018-02-13 | 2019-08-22 | 住友電気工業株式会社 | フレキシブルプリント配線板用基板製造方法及びフレキシブルプリント配線板用基板 |
US11752734B2 (en) | 2017-12-25 | 2023-09-12 | Sumitomo Electric Industries, Ltd. | Base material for printed circuit board and printed circuit board |
US11799183B2 (en) * | 2019-07-17 | 2023-10-24 | Xerox Corporation | System, apparatus, and method for producing printed electrically conductive lines |
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CN116234641B (zh) * | 2020-09-30 | 2024-04-19 | 富士胶片株式会社 | 导电层叠体及导电层叠体的制造方法 |
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JP2006104504A (ja) * | 2004-10-01 | 2006-04-20 | Yoichi Haruta | ポリイミド樹脂材の無電解めっき前処理方法および表面金属化方法、並びにフレキシブルプリント配線板およびその製造方法 |
JP2006287217A (ja) * | 2005-04-01 | 2006-10-19 | Samsung Electro-Mechanics Co Ltd | 基板の表面処理方法、配線形成方法、配線形成装置及び配線基板 |
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US4572764A (en) * | 1984-12-13 | 1986-02-25 | E. I. Du Pont De Nemours And Company | Preparation of photoformed plastic multistrate by via formation first |
CN1021878C (zh) * | 1987-01-24 | 1993-08-18 | 福克斯保罗公司 | 多层印刷电路板制造方法 |
JP2000340911A (ja) | 1999-05-25 | 2000-12-08 | Mitsui Mining & Smelting Co Ltd | プリント配線板用銅箔 |
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JP2006104504A (ja) * | 2004-10-01 | 2006-04-20 | Yoichi Haruta | ポリイミド樹脂材の無電解めっき前処理方法および表面金属化方法、並びにフレキシブルプリント配線板およびその製造方法 |
JP2006287217A (ja) * | 2005-04-01 | 2006-10-19 | Samsung Electro-Mechanics Co Ltd | 基板の表面処理方法、配線形成方法、配線形成装置及び配線基板 |
Cited By (5)
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JP2019114679A (ja) * | 2017-12-25 | 2019-07-11 | 住友電気工業株式会社 | プリント配線板用基材 |
US11752734B2 (en) | 2017-12-25 | 2023-09-12 | Sumitomo Electric Industries, Ltd. | Base material for printed circuit board and printed circuit board |
JP2019140280A (ja) * | 2018-02-13 | 2019-08-22 | 住友電気工業株式会社 | フレキシブルプリント配線板用基板製造方法及びフレキシブルプリント配線板用基板 |
WO2019159473A1 (ja) * | 2018-02-13 | 2019-08-22 | 住友電気工業株式会社 | フレキシブルプリント配線板用基板製造方法及びフレキシブルプリント配線板用基板 |
US11799183B2 (en) * | 2019-07-17 | 2023-10-24 | Xerox Corporation | System, apparatus, and method for producing printed electrically conductive lines |
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CN107615898A (zh) | 2018-01-19 |
US10225931B2 (en) | 2019-03-05 |
CN107615898B (zh) | 2020-11-24 |
JP6760933B2 (ja) | 2020-09-23 |
JPWO2016194972A1 (ja) | 2018-03-22 |
US20180124925A1 (en) | 2018-05-03 |
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