WO2018181726A1 - 表面処理銅箔、並びにこれを用いた銅張積層板およびプリント配線板 - Google Patents
表面処理銅箔、並びにこれを用いた銅張積層板およびプリント配線板 Download PDFInfo
- Publication number
- WO2018181726A1 WO2018181726A1 PCT/JP2018/013279 JP2018013279W WO2018181726A1 WO 2018181726 A1 WO2018181726 A1 WO 2018181726A1 JP 2018013279 W JP2018013279 W JP 2018013279W WO 2018181726 A1 WO2018181726 A1 WO 2018181726A1
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- WIPO (PCT)
- Prior art keywords
- copper foil
- particle
- roughened
- treated copper
- treated
- Prior art date
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- C—CHEMISTRY; METALLURGY
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- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/60—Electroplating characterised by the structure or texture of the layers
- C25D5/605—Surface topography of the layers, e.g. rough, dendritic or nodular layers
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- B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
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- C25D3/38—Electroplating: Baths therefor from solutions of copper
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- C25D5/60—Electroplating characterised by the structure or texture of the layers
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- C25D5/611—Smooth layers
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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
- H05K3/40—Forming printed elements for providing electric connections to or between printed circuits
- H05K3/42—Plated through-holes or plated via connections
- H05K3/425—Plated through-holes or plated via connections characterised by the sequence of steps for plating the through-holes or via connections in relation to the conductive pattern
- H05K3/427—Plated through-holes or plated via connections characterised by the sequence of steps for plating the through-holes or via connections in relation to the conductive pattern initial plating of through-holes in metal-clad substrates
Definitions
- the present invention relates to a surface-treated copper foil, particularly a surface-treated copper foil suitable for a printed wiring board used in a high frequency band. Furthermore, this invention relates to the copper clad laminated board and printed wiring board using the said surface treatment copper foil.
- a method for reducing the transmission loss there are a method for reducing the dielectric constant and a low dielectric loss tangent of the resin base material, and a method for reducing the transmission loss in the circuit wiring (particularly copper foil) which is a conductor.
- a method for reducing the dielectric constant and the dielectric loss tangent of the resin base material a method of selecting a resin (for example, a liquid crystal polymer) having a low dielectric constant and dielectric loss tangent can be mentioned.
- Patent Document 1 discloses a method of adjusting the surface roughness and brightness value (luminance) of a copper foil in order to improve adhesion with a liquid crystal polymer film.
- Patent Document 2 discloses a method of adjusting the height and aspect ratio of roughened particles in order to improve the adhesion with a liquid crystal polymer film.
- Patent Documents 1 and 2 although the adhesiveness with the liquid crystal polymer film can be improved by increasing the unevenness of the copper foil surface, it is sufficient to achieve the required transmission loss level lower than that required recently. is not.
- FIG. 5 shows an example of a process for forming a blind via hole by laser irradiation.
- connection reliability of interlayer connection is not sufficient in recent smaller and higher density circuit boards.
- the method of Patent Document 4 by providing a laser absorption layer on the surface of the roughened particles, in the method of Patent Document 5, by providing a blackening treatment layer having high laser absorption on the surface of the copper foil, It is possible to suppress the resin remaining at the bottom of the blind via hole during laser irradiation.
- a laser absorption layer or a blackening treatment layer with a high transmission loss remains at the interface between the resin substrate other than the blind via hole and the copper foil. For this reason, transmission loss increases, and the required level of transmission loss lower than required in recent years is not sufficient.
- JP 2005-219379 A International Publication No. 2012/020818 JP 2011-168887 A Japanese Patent Laid-Open No. 11-284309 JP 2000-049464 A
- the present invention can achieve both good adhesion to a resin base material and good high-frequency characteristics in a high-frequency band, particularly when used in a conductor circuit of a printed wiring board, and further to laser processability.
- Another object of the present invention is to provide a surface-treated copper foil having excellent surface properties, and a copper-clad laminate and a printed wiring board using the same.
- the present inventors have a surface-treated film including at least a roughened surface on which roughened particles are formed on at least one surface of a copper foil substrate,
- the standard deviation of the height of the roughened particles is 0.16 ⁇ m or more and 0.30 ⁇ m or less on the surface of the surface treatment film.
- the average value of the particle height ratio (particle height / particle width) to the particle width of the roughened particles is 2.30 or more and 4.00 or less, so that it is used particularly for a conductor circuit of a printed wiring board.
- a surface-treated copper foil having both good adhesion to a resin base material and good high-frequency characteristics in a high-frequency band and having good laser processability can be obtained.
- the gist configuration of the present invention is as follows.
- a surface-treated copper foil having a surface-treated film including at least a roughened surface on which roughened particles are formed on at least one surface of a copper foil substrate When observing the cross section of the surface-treated copper foil with a scanning electron microscope, On the surface of the surface treatment film, the standard deviation of the particle height of the roughened particles is 0.16 ⁇ m or more and 0.30 ⁇ m or less, and the ratio of the particle height to the particle width of the roughened particles (particle height / A surface-treated copper foil having an average value of (particle width) of 2.30 or more and 4.00 or less.
- the surface-treated copper foil has a surface-treated film including at least a roughened surface on which roughened particles are formed on at least one surface of the copper foil base, and the cross-section of the surface-treated copper foil Is observed with a scanning electron microscope (SEM), the surface deviation of the roughened particles is 0.16 ⁇ m or more and 0.30 ⁇ m or less on the surface of the surface treatment film, and the roughening is performed.
- SEM scanning electron microscope
- the average value of the particle height ratio (particle height / particle width) to the particle width of the particles is 2.30 or more and 4.00 or less, particularly when used for a conductor circuit of a printed wiring board, A surface-treated copper foil that can achieve both good adhesion and good high-frequency characteristics in the high-frequency band, and also has good laser processability, and a copper-clad laminate and printed wiring board using the same it can.
- FIG. 1 is a schematic view when the surface shape of the surface-treated film is represented by a contour line when the surface-treated copper foil of the present invention is viewed in cross section.
- FIG. 2 is a view for explaining the state of the surface of the surface-treated copper foil when the copper-clad laminate using the surface-treated copper foil of the present invention is irradiated with a laser.
- FIG. 3 shows an SEM image (FIG. 3A) when a cross section of the surface-treated copper foil produced in Example 5 is observed, and a diagram (FIG. 3B to FIG. (D)).
- FIG. 4 shows an SEM image (FIG. 4 (a)) when a cross section of the surface-treated copper foil produced in Comparative Example 7 is observed, and a diagram (FIG.
- FIG. 5 is a diagram for explaining a problem that has conventionally occurred when a blind via hole is formed in a copper-clad laminate by laser irradiation.
- FIG. 6 is a view for explaining the state of the surface of the surface-treated copper foil when a conventional copper-clad laminate using the surface-treated copper foil is irradiated with a laser.
- the surface-treated copper foil according to the present invention has a surface-treated film including at least a roughened surface on which roughened particles are formed on at least one surface of a copper foil substrate, and scans a cross section of the surface-treated copper foil.
- the surface of the surface treatment film When observed with a scanning electron microscope (SEM), the surface of the surface treatment film has a standard deviation of the particle height of the roughened particles of 0.16 ⁇ m to 0.30 ⁇ m, and the particles of the roughened particles
- the average value of the particle height ratio to the width is 2.30 or more and 4.00 or less.
- the surface-treated copper foil of the present invention has a copper foil substrate and a surface-treated film including at least a roughened surface having roughened particles formed on at least one surface of the copper foil substrate.
- the surface of such a surface-treated film is at least one surface of the outermost surface (front and back surfaces) of the surface-treated copper foil, and the formation state of roughened particles formed on at least one surface of the copper foil substrate And a roughened surface having a fine concavo-convex surface shape reflecting the particle shape and the like.
- the surface of such a surface treatment film may be, for example, a roughened surface in which roughened particles are formed on a copper foil substrate, or this roughened surface.
- the surface of the silane coupling agent layer may be formed.
- the surface-treated copper foil of this invention is used for the conductor circuit of a printed wiring board, the said roughening surface turns into the surface (sticking surface) for sticking and laminating
- the surface of the surface-treated copper foil is subjected to cross-section processing using, for example, an ion milling apparatus, and the processed cross-section is observed with a scanning electron microscope (SEM), thereby roughening the roughened surface.
- SEM scanning electron microscope
- a secondary electron image with a magnification of 5,000 is observed at an SEM acceleration voltage of 5 kV.
- the analysis of the roughened particles on the roughened surface is performed by image analysis of the SEM image obtained by observing the cross section. Specifically, the SEM image at a predetermined magnification is subjected to image processing, and the contour line of the surface shape of the roughened surface is extracted as shown in FIG. Next, in the observation field (corresponding to the SEM image), the tip of the highest roughened particle (highest point T) and the lowest valley (lowest point B) between the roughened particle gaps are selected. Further, two parallel lines (the highest line L T and the lowest line L B ) are drawn perpendicularly to the left and right ends of the observation field so as to pass through the highest point T and the lowest point B, respectively. A quadrangle surrounded by four intersections where these two parallel lines intersect is defined as a measurement area.
- the surface-treated copper foil having a low height of the roughened particles, particularly when a difficult-to-adhere resin such as a liquid crystal polymer is used as the resin substrate material. Contributes less to adhesion. Therefore, in the above image analysis, the measurement area, a position where the height from the lowest line L B is about 25% of the total measuring area height, as an effective height contribution to adhesion can be ensured, "the reference Height L S "is provided.
- particles protruding above the “reference height L S ” are defined as “roughened particles”.
- particles height of the roughening particles, and the height dimension h to the tip of the roughening particles from the lowest line L B of the measurement area are defined as “roughened particles”.
- the particle width of the roughened particles is drawn in the width direction at a position that is the maximum in the width direction at a position higher than the reference height L S , and the width direction between two points intersecting the contour line of the roughened particles.
- this resin residue becomes particularly noticeable when the transmission loss due to the copper foil is reduced, that is, when the coarse particles are refined.
- the resin residue after laser irradiation can be reduced even when fine roughening treatment is performed (laser processability is improved).
- a surface-treated copper foil can be obtained.
- the standard deviation of the particle height of the roughened particles is 0.16 ⁇ m or more and 0.30 ⁇ m or less, and the average value of the particle height ratio (particle height / particle width) to the particle width. Is controlled to 2.30 or more and 4.00 or less. Controlling the standard deviation of the particle height of the roughened particles and the average value of the particle height ratio (particle height / particle width) to the particle width of the roughened particles within the above range means that in the roughened surface, This means that the uniformity of the height of the roughened particles is reduced to some extent, and the roughened particles are formed into an elongated shape.
- the mechanism for obtaining good laser processability on the roughened surface controlled as described above is not necessarily clear, but the roughened surface is such that the laser light is regularly reflected on the roughened surface during laser irradiation.
- Laser light can be introduced into the gaps of the roughened particles with effective suppression.
- the laser light is easily introduced into the lower part of the gaps while being irregularly reflected on the side surfaces of the roughened particles.
- the resin residue remaining on the copper foil surface after laser irradiation can be effectively reduced by effectively utilizing the laser light irradiated on the roughened surface for removing the resin.
- FIG. 2 schematically shows the state of the surface of the surface-treated copper foil when the resin substrate surface of the copper-clad laminate using the surface-treated copper foil of the present invention is irradiated with laser.
- FIG. 6 schematically shows the surface of the surface-treated copper foil when laser-irradiated on the resin substrate surface of the copper-clad laminate using the conventional surface-treated copper foil. Indicate. Since the surface of the resin base material 13 is smooth when starting to irradiate the laser light 30, regular reflection of the laser light 30 on the surface of the resin base material tends to occur (not shown).
- the irregular reflection 32 ( A wavy arrow) occurs, and the removability of the resin base material 13 by the laser beam 30 is enhanced (FIGS. 2A and 2B, FIGS. 6A and 6B).
- the resin removing action by the irregular reflection 32 of the laser beam becomes more remarkable when the height of the roughened particles 111 is not uniform, as shown in FIG. 2B, and the laser processability is improved.
- a broken line arrow 31 indicates regular reflection of laser light
- a wavy arrow 32 indicates irregular reflection of laser light.
- the standard deviation of the particle height of the roughened particles is 0.16 ⁇ m or more and 0.30 ⁇ m or less, and preferably 0.22 ⁇ m or more and 0.30 ⁇ m or less.
- the standard deviation of the particle height is less than 0.16 ⁇ m, the effect of suppressing the above-described regular reflection of the laser beam is reduced, the laser workability is inferior and the adhesion between the copper foil and the resin base material is also inferior.
- the standard deviation of the particle height exceeds 0.30 ⁇ m, it is presumed that the transmission loss increases and the high frequency characteristics are inferior.
- the average value of the height of the roughened particles is preferably 0.50 ⁇ m or more and 1.20 ⁇ m or less, and more preferably 0.60 ⁇ m or more and 0.90 ⁇ m or less.
- the average value of the particle height is less than 0.50 ⁇ m, the effect of suppressing the regular reflection of the laser beam described above is reduced, the laser workability is inferior, and the adhesion between the copper foil and the resin base material is also inferior.
- the average value of the particle height exceeds 1.20 ⁇ m, it is presumed that the transmission loss increases and the high frequency characteristics are inferior.
- the average value of the particle height ratio (particle height / particle width) to the particle width of the roughened particles is 2.30 to 4.00, and is 2.60 to 3.80. Is preferred.
- the average value of this ratio within the above range, the regular reflection of the laser light on the surface of the roughened particles is effectively suppressed during laser irradiation, and the laser light that has penetrated into the gaps of the roughened particles It becomes easy to be introduced to the lower part of the gap while being irregularly reflected on the side surface. As a result, the effect of reducing the resin residue remaining on the copper foil surface after laser irradiation is obtained.
- the average value of the ratio is less than 2.30, the effect of suppressing the regular reflection of the laser light described above is reduced, the laser workability is inferior, and the copper foil and the resin base material The adhesion will be inferior.
- the average value of the above ratio exceeds 4.00, it becomes difficult to fill the resin base material between the roughened particles, and the adhesion between the copper foil and the resin base material is poor. Inferred.
- the standard deviation of the particle height ratio (particle height / particle width) to the particle width of the roughened particles is preferably 1.20 or more and 2.00 or less.
- the adhesion with the resin base material can be improved while the roughened surface is finely roughened.
- the standard deviation of the ratio (particle height / particle width) is less than 1.20, the effect of suppressing the regular reflection of the laser beam described above is reduced, the laser workability is inferior, and the copper foil and the resin base material Adhesion will also be poor.
- the brightness is preferably 10.0 or more and 14.0 or less.
- the lower the brightness of the roughened surface the more effectively the regular reflection of the laser beam on the roughened surface can be more effectively suppressed.
- the brightness of the roughened surface is too low, the reflection performance of the laser light on the roughened surface itself is reduced.
- the luminance means a “Y value” representing a reflectance in the XYZ color system defined by the CIE (International Commission on Illumination).
- the surface-treated copper foil of the present invention for example, can be used for a conductor circuit of a circuit board to highly suppress transmission loss when transmitting a high frequency signal in the GHz band, and the surface-treated copper foil and a resin base material (resin Adhesion with the layer) can be maintained well. Furthermore, since resin residues can be reduced during laser irradiation when forming blind via holes, a circuit board with high interlayer connection reliability can be obtained.
- the surface of the copper foil base before the roughening treatment is preferably not too rough.
- the surface roughness of the copper foil base surface The ten-point average roughness Rzjis based on JIS B0601-2001 is preferably 1.5 ⁇ m or less. Even if the surface of the copper foil base is smooth, for example, in the case of a rolled copper foil having a recess such as an oil pit, it is difficult to control the uniformity of the roughened particles within a predetermined range. Therefore, the copper foil base is particularly preferably an electrolytic copper foil.
- the roughening treatment is preferably performed by combining a roughening plating treatment (1) and a roughening plating treatment (2) as shown below, for example.
- Roughening plating treatment (1) is a method of forming roughening particles on at least one surface of a copper foil substrate, and specifically, plating treatment under the following conditions is performed in a copper sulfate bath.
- the roughening plating process (2) is performed to prevent (fix) the roughened particles from falling off by performing smooth covering plating on the copper foil substrate surface-treated by the roughening plating (1). Specifically, the plating process is performed in a copper sulfate bath under the following conditions.
- Copper sulfate pentahydrate 50 to 100 g / L in terms of copper (atom) Sulfuric acid ... 100-200g / L
- Ammonium molybdate 0.01 to 0.04 g / L in terms of molybdenum (atom)
- Iron (II) sulfate heptahydrate 1-10 g / L in terms of iron (atom)
- Current density 10 to 25 A / dm 2
- the particle height of the roughened particles is made moderately uneven on the roughened surface, and the shape of the particles is elongated. To control. Thereby, the surface-treated copper foil of this invention with which all the required characteristics of a high frequency characteristic, adhesiveness, and laser workability are favorable can be obtained.
- the uniformity of the particle height tends to increase. This is considered to be due to the fact that nucleation is likely to occur during electroplating in the roughening treatment. In such a situation, the nucleation of the roughened particles by electroplating tends to stop, and it becomes difficult for specific roughened particles to grow preferentially. Differences are unlikely to occur.
- the effect of suppressing nucleation during the electroplating of the roughening treatment is, for example, to set the plating current density low, to increase the surface roughness of the copper foil substrate, to increase the blowing direction of the plating solution, to the plating solution For example, lowering the liquid temperature of the copper foil, slowing the conveying speed of the copper foil substrate, and the like.
- the blowing condition of the plating solution and the transport speed of the copper foil substrate affect the flow of the plating solution to the surface of the copper foil substrate and affect the way the plating solution flows on the surface of the copper foil substrate.
- a laminar flow tends to occur when the plating solution flows in a uniform manner, and a turbulent flow tends to occur when the plating solution flow is disturbed. Since the plating is easy to grow uniformly under laminar flow conditions, the shape of the roughened particles is uniform, and under turbulent flow conditions, the growth of plating is uneven, resulting in uneven shape of the roughened particles.
- the plating conditions can be greatly adjusted by applying the above-described plating conditions for suppressing nucleation during the electroplating of the roughening treatment to the copper foil base having surface irregularities that do not impair the macro smoothness.
- the height uniformity of the roughened particles can be reduced.
- the roughness of the drum surface when the copper foil substrate is made is adjusted (for example, the drum surface is roughened). Polishing by buffing, etc.) Adjusting the concentration and ratio of brightener and leveler added to the plating solution during foil production (for example, reducing the leveler concentration, etc.) And a method of dissolving (etching) in (for example, increasing the etching time).
- the ten-point average roughness Rzjis based on JIS B0601-2001 is preferably 1.5 ⁇ m or less.
- the uniformity of the height of the roughened particles can be appropriately reduced without excessively roughening the surface roughness of the copper foil substrate.
- the electroplating of the roughening particles is performed in a plurality of times, the current density of the subsequent electroplating is made larger than that of the previous electroplating, thereby roughening particles formed by the previous electroplating.
- the height difference can be further enlarged.
- the level difference of the roughened particles can be increased by appropriately selecting an additive element in the plating solution for roughening plating.
- a plurality of plating conditions are controlled so as to suppress nucleation during roughing electroplating.
- some of the roughened particles are grown in an elongated shape, the height of the roughened particles is uneven, and the uniformity of the height of the roughened particles as a whole is appropriately reduced.
- the surface-treated copper foil of the present invention has a roughened surface having a predetermined fine irregular surface shape formed by electrodeposition of roughened particles on at least one surface of the copper foil substrate, A silane coupling agent layer directly on the roughened surface or indirectly via an intermediate layer such as an underlayer containing Ni, a heat-resistant layer containing Zn, and a rust-proofing layer containing Cr. May be further formed.
- the underlayer, the intermediate layer, and the silane coupling agent layer have a very thin treatment thickness, and therefore do not affect the particle shape of the roughened particles on the roughened surface of the surface-treated copper foil.
- the particle shape of the roughened particles on the roughened surface of the surface-treated copper foil is substantially determined by the particle shape of the roughened particles on the roughened surface corresponding to the roughened surface.
- a silane coupling agent layer for example, a silane coupling agent is directly or indirectly via an underlayer, an intermediate layer, etc. on the uneven surface of the roughened surface of the surface-treated copper foil.
- coating a solution is mentioned.
- the applied silane coupling agent solution may be dried by evaporating water, but heating and drying at 50 to 180 ° C. is preferable in that the reaction between the silane coupling agent and the copper foil is promoted.
- the concentration of the silane coupling agent in the solution used when the silane coupling agent solution is applied to the surface of the underlayer, the intermediate layer, etc. is high enough to apply a sufficient amount of the silane coupling agent. Therefore, the content is preferably 0.01 to 15% by volume, more preferably 0.1 to 10% by volume. It is preferable to use water as the solvent of the solution.
- the silane coupling agent layer is any one of epoxy silane, amino silane, vinyl silane, methacryl silane, acrylic silane, styryl silane, ureido silane, mercapto silane, sulfide silane and isocyanate silane. It is preferable to contain more than one kind of silane coupling agent. These silane coupling agents have different effects due to the action of reactive functional groups contained in the resin of the resin base material, so it is necessary to select an appropriate one considering the compatibility with the resin. It is.
- silane coupling agent examples include 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3- Methacryloxypropyltriethoxysilane, p-styryltrimethoxysilane, p-styryltriethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-acryloxypropyltrimethoxysilane, 3-ureidopropyltriethoxysilane, 3- Mercaptopropyltrimethoxysilane, 3-isocyanatopropyltriethoxysilane, bis (3- (triethoxysilyl) propyl) disulfide and the like can be mentioned, but other silane coupling agents can be used. You also, can be appropriately selected and used. Moreover, these silane coupling agents can be
- the surface treatment copper foil and the silane coupling agent layer are selected from an underlayer containing Ni, a heat-resistant treatment layer containing Zn, and a rust prevention treatment layer containing Cr. More preferably, it has at least one intermediate layer.
- the underlayer containing Ni is It is preferable to form between the roughened surface and the silane coupling agent layer.
- the underlayer is formed of, for example, Ni or an alloy containing Ni, for example, an alloy containing at least one element other than Ni selected from Ni-phosphorus (P), Ni-Z, and the like. It is preferable to do.
- the heat-resistant treatment layer is made of, for example, Zn or an alloy containing Zn, that is, Zn—tin (Sn), Zn—Ni, Zn—cobalt (Co), Zn—Cu, Zn—Cr, and Zn—vanadium (V It is preferable to form an alloy containing at least one element other than Zn selected from
- the antirust treatment layer contains, for example, at least one element other than Cr selected from Cr or an alloy containing Cr, that is, Cr—Zn, a chromate layer formed by chromate treatment, and the like. It is preferable to form with an alloy.
- the base layer, the heat-resistant treatment layer, and the rust prevention treatment layer are preferably formed in this order on the roughening treatment layer. Any one layer or only two layers may be formed depending on the characteristics to be performed.
- a surface-treated copper foil is produced according to the following formation steps (S1) to (S5).
- S1 Roughening treatment layer forming step A roughening treatment surface having fine irregularities is formed on a copper foil substrate by electroplating of roughening particles.
- S2) Formation process of underlayer An underlayer containing Ni is formed on the roughened surface as necessary.
- S3) Heat-resistant treatment layer forming step A heat-resistant treatment layer containing Zn is formed on the roughened surface or the base layer as necessary.
- the surface-treated copper foil of the present invention is suitably used for the production of a copper clad laminate.
- a copper-clad laminate is suitably used for the production of a printed wiring board having good adhesion and high frequency characteristics. That is, the surface-treated copper foil of the present invention can be suitably used for a high-frequency band printed wiring board.
- the copper clad laminate of the present invention is preferably formed using the above-described surface-treated copper foil of the present invention.
- Such a copper clad laminate of the present invention can be formed by a known method.
- the copper-clad laminate is obtained by laminating and bonding the surface-treated copper foil of the present invention and the resin base material so as to face the resin base material on the roughened surface (sticking surface) of the surface-treated copper foil. Can be manufactured.
- the copper clad laminated board when manufacturing a copper clad laminated board, what is necessary is just to manufacture by heat-pressing the surface treatment copper foil which has a silane coupling agent layer, and a resin base material.
- coating a silane coupling agent on the resin base material, and sticking this resin base material and the surface-treated copper foil which has an antirust process layer on the outermost surface with a heat press Has the same effect as the copper-clad laminate of the present invention.
- the resin used for the resin substrate polymer resins having various components can be used.
- a phenolic resin or an epoxy resin can be mainly used for a rigid wiring board or a printed wiring board for a semiconductor package (PKG).
- polyimide or polyamideimide can be mainly used.
- a heat-resistant resin having a high glass transition point (Tg) can be used as a material with good dimensional stability, a material with little warping and twisting, a material with little heat shrinkage, etc. .
- thermoplastic resin such as liquid crystal polymer, polyether ether ketone, polyphenylene sulfide, polyphenylene ether, polyphenylene oxide, polyether imide, polyether sulfone, polyethylene naphthalate, polyethylene terephthalate, thermoplastic polyimide or the like.
- a polymer alloy such as polyimide, a heat-resistant epoxy resin, a cyanate resin such as bismaleimide triazine, a thermosetting resin such as thermosetting modified polyphenylene ether, and the like.
- the resin used for the resin base material of the copper-clad laminate of the present invention is preferably a liquid crystal polymer.
- the liquid crystal polymer includes a thermotropic liquid crystal polymer exhibiting liquid crystallinity in a molten state and a rheotropic liquid crystal polymer exhibiting liquid crystallinity in a solution state.
- any liquid crystal polymer can be used, but a thermotropic liquid crystal polymer is preferably used from the viewpoint of thermoplasticity and better dielectric properties.
- thermotropic liquid crystal polyester (hereinafter simply referred to as “liquid crystal polyester”) is, for example, an aromatic hydroxycarboxylic acid as an essential monomer and reacted with a monomer such as an aromatic dicarboxylic acid or aromatic diol. It is an aromatic polyester obtained by this, and exhibits liquid crystallinity when melted.
- Typical examples thereof include Type I [Formula (1)] synthesized from parahydroxybenzoic acid (PHB), phthalic acid, and 4,4′-biphenol, PHB and 2,6-hydroxynaphthoic acid.
- I-type liquid crystal polyester and II-type liquid crystal polyester are preferable among the above.
- isophthalic acid is preferable as phthalic acid.
- the liquid crystal polymer film used in the present embodiment is preferably substantially composed only of a liquid crystal polymer because of dielectric properties and the like.
- the liquid crystal polymer exhibits strong anisotropy when subjected to shear stress, and therefore, if necessary, a filler for relaxing the molecular orientation anisotropy generated when the liquid crystal polymer is melt processed may be blended. Good. By introducing such filler for relaxing the alignment, for example, the surface of the liquid crystal polymer after being extruded becomes smooth, and it becomes easy to obtain uniform orientation and isotropy.
- a colored filler may be blended.
- the filler for orientation relaxation or the filler for coloring which may be blended in the liquid crystal polymer film is not particularly limited.
- the filler which consists of etc. can be mentioned.
- the shape of the filler is not particularly limited, and examples thereof include a spherical shape, a plate shape, a rod shape, a needle shape, and an indeterminate shape.
- the size of the filler is preferably 50 nm or more and 10 ⁇ m or less. The size of the filler may be measured as the longest part of each filler in the enlarged photograph, or may be calculated as a volume average particle diameter or a number average particle diameter obtained from particle size distribution measurement.
- the filler for aligning or coloring the liquid crystal polymer film may impair the dielectric properties of the base film. Therefore, the ratio of the filler to the entire liquid crystal polymer film (total of the liquid crystal polymer and the filler) is preferably 20% by mass or less. By setting the ratio to 20% by mass or less, excellent dielectric properties can be imparted as a liquid crystal polymer film.
- the thermal linear expansion coefficient in the plane direction of such a liquid crystal polymer film is preferably 3 ppm / ° C. or more and 30 ppm / ° C. or less. If the difference between the thermal linear expansion coefficient of the liquid crystal polymer film and the thermal linear expansion coefficient of the surface-treated copper foil is large, the copper-clad laminate tends to warp. Therefore, generation
- liquid crystal polymer molecules are very easy to align because they are rigid and have a long chemical structure.
- Anisotropic films in which liquid crystal polymer molecules are oriented in a specific direction are easy to tear in the orientation direction and difficult to handle, and have poor dimensional accuracy and large variations in thermal stress, mechanical strength, relative permittivity, etc. .
- warping due to the anisotropy of the film occurs in the copper clad laminate. Cannot be used.
- the molecular orientation of the liquid crystal polymer film used as the insulating base material for the electric circuit board is preferably controlled so as to be isotropic.
- the ratio of the maximum value to the minimum value of the thermal linear expansion coefficient in the planar direction is preferably 1.0 or more and 2.5 or less.
- the ratio is more preferably 2.0 or less, further preferably 1.8 or less, and particularly preferably 1.5 or less.
- Each of the minimum value and the maximum value of the coefficient of thermal expansion is measured at six points of the coefficient of thermal expansion at 30 ° intervals in the circumferential direction on the plane of the liquid crystal polymer film, and is set to the minimum value and the maximum value among the measured values.
- the anisotropy of thermal stress, mechanical strength, and dielectric constant in the plane direction can be more reliably reduced. can do.
- the characteristic which was excellent as a material of an electronic circuit board such as generation
- the warp rate of a copper clad laminate in which a surface-treated copper foil is laminated on one side of a liquid crystal polymer film can be suppressed to 10% or less.
- the “warp rate” can be obtained in accordance with JIS C6481-1996.
- the film place the film on a horizontal base, with the center of the film in contact with the base and the four corners floating from the base, and measure the distance between the four corners and the base to obtain the maximum value.
- the percentage value obtained by dividing the length by the length of the side of the film is called the “warp rate”.
- the dielectric properties of liquid crystal polymer films are generally excellent. Specifically, when measured at a frequency of 3 GHz, the dielectric loss tangent is preferably 0.0035 or less, more preferably 0.003 or less, and the relative dielectric constant is 3.5 or less. preferable.
- the dielectric loss tangent When an AC electrical signal propagates through a circuit formed on a dielectric insulating substrate, a part of the power of the signal is absorbed by the dielectric, and the signal tends to be attenuated or lost. .
- the ratio of the power absorbed at this time and the transmitted (propagated) power is the dielectric loss tangent, and the transmission loss can be reduced in a circuit using a dielectric having a small dielectric loss tangent.
- the thickness of the liquid crystal polymer film may be appropriately adjusted, but is preferably 10 ⁇ m or more and 75 ⁇ m or less. If the said thickness is 10 micrometers or more, sufficient intensity
- the lower limit of the thickness is more preferably 13 ⁇ m or more, further preferably 20 ⁇ m or more, and the upper limit of the thickness is more preferably 50 ⁇ m or less, and further preferably 25 ⁇ m or less.
- the copper-clad laminate according to this embodiment can be easily manufactured by laminating a surface-treated copper foil on one or both sides of a liquid crystal polymer film and then hot pressing. it can.
- the hot press can be performed by a conventionally known method using a vacuum press device, a roll press device, a double belt press device, or the like.
- the conditions for the hot press may be adjusted as appropriate.
- the temperature may be about 200 ° C. or higher and 350 ° C. or lower, and the pressure may be 1 MPa or higher and 10 MPa or lower for 1 minute or longer and 2 hours or shorter. .
- the thickness of the surface-treated copper foil according to the present embodiment may be adjusted as appropriate, and may be, for example, about 2 ⁇ m or more and 70 ⁇ m or less, and more preferably about 5 ⁇ m or more and 35 ⁇ m or less.
- the adhesion between the surface-treated copper foil and the liquid crystal polymer film is high. Copper-clad laminates with high adhesion are treated with surface-treated copper foil and resin even after processing such as etching, drilling, desmearing, soft etching, copper plating, etc. in the wiring pattern formation process and blind via hole drilling process. It can be used without any problem in peeling off from the substrate. Specifically, in accordance with JIS C6471-1995, the surface-treated copper foil is etched to form a copper foil pattern of 5 mm ⁇ 150 mm, and the copper foil pattern is 50 mm using a tensile tester.
- the peel strength expressed as strength (unit: N / mm) when peeled in the direction of 180 ° at a speed of / min is preferably 0.40 N / mm or more, and is 0.60 N / mm or more. More preferably, it is more preferably 0.70 N / mm or more.
- the printed wiring board of the present invention is preferably formed using the copper-clad laminate.
- Such a printed wiring board of the present invention can be formed by a known method.
- a desired circuit pattern can be formed by chemically etching a part of the surface-treated copper foil of the copper-clad laminate by a conventional method, and an electronic circuit board can be produced.
- electronic circuit components can be mounted on the circuit pattern.
- the electronic circuit component is not particularly limited as long as it is mounted on the electronic circuit board. Examples of the electronic circuit component include a chip resistor, a chip capacitor, and a semiconductor package (PKG) in addition to a single semiconductor element.
- Example 1 Examples 1 to 10, Comparative Examples 1 to 7
- the following steps [1] to [4] were performed to obtain a surface-treated copper foil. This will be described in detail below.
- Examples 2 to 10 and Comparative Examples 1 to 7, except that the conditions of the roughening plating treatment (1) in the step [2] of the roughening treatment surface were as described in Table 1 above.
- a surface-treated copper foil was obtained.
- roughening plating treatment was performed on one surface of the copper foil base prepared in the above [1].
- the rough plating process was performed by a two-stage electroplating process.
- the roughening plating treatment (1) uses the following basic bath composition of the roughening plating solution, and the current density, liquid temperature, adjustment of the liquid flow, liquid blowing direction, and copper foil substrate transport speed are as shown in Table 1 below. It was. Further, the subsequent rough plating treatment (2) was performed under the following plating conditions using the following fixed plating solution composition.
- laminar flow refers to a flow in a state where the fluid moves regularly
- turbulent flow refers to a flow in a state where the fluid moves irregularly due to vortices. Point to.
- the approximate distinction between laminar flow and turbulent flow is generally judged by the Reynolds number, but here, the case where the roughening plating solution is strong in the direction parallel to the transport direction of the copper foil substrate is described as “ “Laminar flow” is defined, “turbulent flow” is defined when the flow in a direction other than the parallel direction is strong, and “turbulent flow” is defined as “weak turbulent flow”.
- Laminar flow is characterized by regular flow, and even if the flow is temporarily disturbed, the turbulence gradually attenuates and eventually returns to a laminar flow state.
- the direction and strength of the flow at the same location on the surface of the copper foil substrate is Difficult to fluctuate.
- turbulent flow is characterized by complex and irregular flow, and the flow pattern always changes and passes through different paths, so the direction and strength of the flow at the same location on the copper foil substrate surface are likely to fluctuate. .
- Ni 40 g / L H 3 BO 3 : 5 g / L Bath temperature: 20 ° C pH: 3.6 Current density: 0.2 A / dm 2 Processing time: 10 seconds
- the average value and the standard deviation are calculated for each of the particle height and particle width of the roughened particles, and the ratio of the particle height to the particle width of the roughened particles (particle height / particle width). The average value and the standard deviation were calculated.
- FIG. 3 and 4 are SEM images (FIG. 3A, FIG. 4 (A) and FIG. 4 (B) of the surface treated copper foils of Example 5 and Comparative Example 7 of the present invention when the cross section is observed in step (i).
- Luminance (brightness value) For the roughened surface of the surface-treated copper foil, use a lightness meter (manufactured by Suga Test Instruments Co., Ltd., model name: SM color computer, model number: SM-T45) to determine the Y value of the XYZ color system specified by CIE. It was measured.
- the surface-treated copper foil on one side of the double-sided copper-clad plate is formed into a signal layer by forming a linear pattern with a predetermined width (110 ⁇ m) and length (20 mm) by an etching method, and the other copper foil is A circuit board having a microstrip line structure was produced as a ground layer. Further, this circuit board was dried in a circulation oven at 50 ° C. for 24 hours, and then cooled to room temperature under a standard environment described in JIS C6481-1996, to produce a circuit board for high frequency characteristic evaluation.
- the both ends of the pattern of the circuit board for evaluation produced as described above were sandwiched between probe connectors, a high frequency signal (13 GHz) was passed through the pattern, and the intensity of the signal (S21) passing through was measured.
- the measurement was performed using a network analyzer (“ENA E5071C” manufactured by Agilent Technologies Inc.) and a probe connector (“PCSMA” manufactured by Yokoo DS Division).
- the said measurement was performed 5 times by the same pattern, and made the average value the loss amount of each circuit board. Further, the loss amount of each circuit board was indexed with the loss amount of Example 5 as a reference (100), and the transmission loss index was calculated.
- the liquid crystal polymer film was cut into 10 cm ⁇ 10 cm to prepare a test piece.
- the thickness of the central portion of the test piece which is a measurement location for the relative dielectric constant and dielectric loss tangent, was measured using a digital signage gauge (“SMD-565” manufactured by Mitutoyo Corporation, 2 mm diameter of the probe tip). .
- SMD-565 digital signage gauge
- the thickness of a total of 5 points that is, the vertex of a square with a side of 4 cm centering on the center of the test piece and the center of the test piece, was measured, and the arithmetic average was taken as the thickness of the test piece.
- 20 test pieces were cut out from the same liquid crystal polymer film, and the total thickness was measured at 100 points, and the standard deviation was taken as the thickness accuracy.
- the resonance frequency of the resonator itself and its peak when no test piece is inserted was measured.
- the resonance frequency and the Q value in a state where the test pieces are inserted were measured.
- the relative dielectric constant is calculated from the difference between the resonance frequencies when the resonator and the test piece are inserted, and the dielectric loss tangent is calculated from the difference between the Q value and the resonance frequency when the resonator and the test piece are inserted. did.
- Thermal expansion coefficient of liquid crystal polymer film was determined according to JIS C6481-1996 under the following conditions.
- the liquid crystal polymer film was cut into 4 cm ⁇ 20 cm to prepare a test piece.
- this test piece is attached to a thermomechanical measurement device (“Q400” manufactured by TA Instruments Japan Co., Ltd.) so that the distance between chucks is 15 mm, and a load of 0.1 N is applied in a tensile mode.
- the temperature was raised from room temperature to 170 ° C. at a rate of temperature rise of 40 ° C./min, and held at 170 ° C. for 1 minute. Thereafter, the change ⁇ L in the inter-chuck distance between 100 ° C. and 50 ° C. when the temperature was lowered from 170 ° C. to room temperature at a temperature reduction rate of 10 ° C./min was measured.
- the thermal expansion coefficient was calculated by the following formula.
- the above measurement is carried out at six points at 30 ° intervals in the circumferential direction on the plane of the liquid crystal polymer film, and the coefficient of thermal expansion is calculated from each value, and the ratio between the maximum value and the minimum value (maximum value / minimum value). Asked.
- a liquid crystal polymer film having the thickness of 50 ⁇ m (same as above) is laminated on one side so that the roughened surface of the surface-treated copper foils of the above examples and comparative examples is in contact with the liquid crystal polymer film, and a polyimide film as a release material on the other side ("Upilex 20S" manufactured by Ube Industries, Ltd.) was laminated.
- This laminate is sandwiched between two stainless steel plates with a thickness of 2 mm, and stainless steel woven fabrics with a thickness of 1 mm are used as cushioning materials above and below the stainless steel plate, using a vacuum press machine at 300 ° C. and a pressure of 3 MPa. By holding for 5 minutes, a single-sided copper clad laminate was obtained.
- a 5 mm wide masking tape was attached to the copper foil side of the copper clad laminate, and immersed in a ferric chloride solution to remove unnecessary portions of the copper foil by etching. Thereafter, the copper-clad laminate was washed with water, the masking tape was peeled off, and dried in an circulating oven at 80 ° C. for 1 hour to form a linear circuit pattern having a width of 5 mm.
- the test piece was attached to a reinforcing plate having a thickness of 1 mm or more so that the test piece would not be bent and the peel angle would not change.
- the copper foil After peeling off one end of the formed circuit pattern and sandwiching it in the tensile tester, the copper foil is peeled off at a rate of 50 mm / min in the direction of 180 ° with respect to the test piece by 10 mm or more. The calculated value was defined as the peel strength (N / mm).
- the 180 ° peel strength is measured, the case where the 180 ° peel strength is 0.40 N / mm or more is good, and the case where it is 0.60 N / mm or more is excellent. It was evaluated.
- a carbon dioxide laser was irradiated from the liquid crystal polymer film side of the copper clad laminate to form a via hole.
- Laser irradiation was performed under the conditions of pulse width: 1 to 5 ⁇ s, tip energy: 1 to 3 mJ, mask diameter: 1 to 3 mm, and number of irradiation: 5 to 10 shots depending on the structure of the roughened particles.
- the via hole diameter was 100 ⁇ m, and arbitrarily 150 locations were formed.
- the roughened surface of the surface-treated copper foil on the via bottom was observed to confirm the presence or absence of a resin residue.
- the resin residue was confirmed by etching out the surface-treated copper foil after laser processing and observing whether the resin remained as a film at the bottom of the via hole using an optical microscope at a magnification of 10 times. For each copper clad laminate, 150 holes were confirmed and the number of resin residues not present was counted.
- the resin residue is confirmed as an index of laser processability, the case where the number of resin residues not confirmed is 40 or more is good, and the case where it is 80 or more is excellent. evaluated.
- the surface-treated copper foils of Examples 1 to 10 had a roughened surface with a standard deviation of the height of the roughened particles of 0.16 ⁇ m when the cross section was observed by SEM. Since the particle height ratio (particle height / particle width) with respect to the particle width of the roughened particles is controlled within the range of not less than 0.30 ⁇ m and not less than 2.30 and not more than 4.00, It was confirmed that both good high-frequency characteristics and good adhesion could be achieved, and that laser processability was also good. In particular, in Examples 4 to 7, it was possible to obtain a surface-treated copper foil excellent in all the characteristics of high-frequency characteristics, adhesion, and laser processability.
- the roughened surface had a standard deviation of the particle height of the roughened particles in the range of 0.16 ⁇ m to 0.30, and the roughened particles
- the ratio of the particle height to the particle width is not controlled within the range of 2.30 or more and 4.00 or less, so that it has a higher frequency than the surface-treated copper foils of Examples 1 to 10. It was confirmed that at least one of the characteristics, adhesion, and laser processability was inferior.
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Abstract
Description
[1]銅箔基体の少なくとも一方の面に、粗化粒子が形成された粗化処理表面を少なくとも含む表面処理皮膜を有する表面処理銅箔であって、
前記表面処理銅箔の断面を、走査型電子顕微鏡により観察するとき、
前記表面処理皮膜の表面において、前記粗化粒子の粒子高さの標準偏差が0.16μm以上0.30μm以下であり、かつ、前記粗化粒子の粒子幅に対する粒子高さ比(粒子高さ/粒子幅)の平均値が2.30以上4.00以下であることを特徴とする、表面処理銅箔。
[2]前記表面処理皮膜の表面において、前記粗化粒子の粒子高さの平均値が0.50μm以上1.20μm以下である、上記[1]に記載の表面処理銅箔。
[3]前記表面処理皮膜の表面において、前記粗化粒子の粒子幅に対する粒子高さ比(粒子高さ/粒子幅)の標準偏差が1.20以上2.00以下である上記[1]または[2]に記載の表面処理銅箔。
[4]前記表面処理皮膜の表面において、輝度が10.0以上14.0以下である、上記[1]~[3]のいずれかに記載の表面処理銅箔。
[5]高周波帯域用プリント配線板に使用するための、上記[1]~[4]のいずれかに記載の表面処理銅箔。
[6]上記[1]~[5]のいずれかに記載の表面処理銅箔を用いて形成された銅張積層板。
[7]前記銅張積層板に使用される樹脂が液晶ポリマーである、上記[6]に記載の銅張積層板。
[8]上記[6]または[7]に記載の銅張積層板を用いて形成されたプリント配線板。
硫酸銅五水和物・・・銅(原子)換算で、50~100g/L
硫酸・・・100~200g/L
モリブデン酸アンモニウム・・・モリブデン(原子)換算で、0.01~0.04g/L
硫酸鉄(II)七水和物・・・鉄(原子)換算で、1~10g/L
電流密度・・・10~25A/dm2
液温(浴温)・・・20~25℃
硫酸銅五水和物・・・銅(原子)換算で、40~60g/L
硫酸・・・80~120g/L
電流密度・・・0.5~10A/dm2
液温(浴温)・・・45~60℃
以下に、本発明の表面処理銅箔の好ましい製造方法の一例をまとめる。 好ましくは以下の形成工程(S1)~(S5)に従い、表面処理銅箔を作製する。
(S1)粗化処理層の形成工程
銅箔基体上に、粗化粒子の電気めっきにより、微細な凹凸をもつ粗化処理表面を形成する。
(S2)下地層の形成工程
粗化処理表面上に、必要に応じてNiを含有する下地層を形成する。
(S3)耐熱処理層の形成工程
粗化処理表面上または下地層上に、必要に応じてZnを含有する耐熱処理層を形成する。
(S4)防錆処理層の形成工程
粗化処理表面上、または、粗化処理表面上に任意に形成した下地層および/または耐熱処理層上に、必要に応じてCrを含有する防錆処理層を形成する。
(S5)シランカップリング剤層の形成工程
粗化処理表面上に、直接、または、下地層、耐熱処理層および防錆処理層の少なくとも一層を形成した中間層を介して間接的にシランカップリング剤層を形成する。
実施例1では、以下の工程[1]~[4]を行い、表面処理銅箔を得た。以下詳しく説明する。なお、実施例2~10および比較例1~7は、粗化処理表面の形成工程[2]において、粗化めっき処理(1)の各条件を、上記表1に記載の通りとした以外は、実施例1と同様の方法にて、表面処理銅箔を得た。
粗化処理を施すための基材となる銅箔基体として、電解銅箔を準備した。電解銅箔は下記条件により製造した。また、下記条件により製造された電解銅箔の厚さと表面粗さは下記の通りである。
Cu :80g/L
H2SO4 :70g/L
塩素濃度 :25mg/L
浴温 :55℃
電流密度 :45A/dm2
(添加剤)
・3-メルカプト1-プロパンスルホン酸ナトリウム :2mg/L
・ヒドロキシエチルセルロース :10mg/L
・低分子量膠(分子量3000) :50mg/L
厚さ:12μm
表面粗さ:1.3μm(JIS B0601-2001に準拠した十点平均粗さRzjis)
なお、表面粗さの測定は、電解銅箔の表面において、接触式表面粗さ測定機(株式会社小坂研究所製「サーフコーダーSE1700」)を用いて行った。
次に、上記[1]にて準備した銅箔基体の片面に、粗化めっき処理を施した。この粗化めっき処理は、2段階の電気めっき処理により行った。粗化めっき処理(1)は、下記の粗化めっき液基本浴組成を用い、電流密度、液温、液流の調節、液の吹き出し方向および銅箔基体の搬送速度を下記表1記載の通りとした。また、続けて行う粗化めっき処理(2)は、下記固定めっき液組成を用い、下記めっき条件にて行った。
Cu :60g/L
H2SO4 :150g/L
Mo :0.03g/L
Fe :2g/L
Cu :40g/L
H2SO4 :100g/L
電流密度 :8A/dm2
浴温 :45℃
続いて、上記[2]で形成した粗化処理表面上に、下記の条件で、Ni、Zn、Crの順に金属めっきを施して下地層および中間層を形成した。
Ni :40g/L
H3BO3 :5g/L
浴温 :20℃
pH :3.6
電流密度:0.2A/dm2
処理時間:10秒
Zn :2.5g/L
NaOH :40g/L
浴温 :20℃
電流密度:0.3A/dm2
処理時間:5秒
Cr :5g/L
浴温 :30℃
pH :2.2
電流密度:5A/dm2
処理時間:5秒
最後に、上記[3]にて形成した中間層(特に、最表面のCrめっき層)の上に、濃度5質量%の3-メタクリロキシプロピルトリメトキシラン水溶液を塗布し、100℃で乾燥させ、シランカップリング剤層(シランの付着量はSi原子換算で、0.005mg/dm2)を形成した。
上記実施例および比較例にかかる表面処理銅箔について、下記に示す測定および各特性の評価を行った。各特性の評価条件は下記の通りである。結果を表2に示す。
粗化粒子の粒子高さおよび粒子幅は、以下のステップ(i)~(iv)にて、画像解析を行い、計測した。
表面処理銅箔の粗化面について、明度計(スガ試験機株式会社製、機種名:SMカラーコンピューター、型番:SM-T45)を使用して、CIEで規定するXYZ表色系のY値を測定した。
厚さ50μmの液晶ポリマーフィルム(株式会社伊勢村田製作所製、厚さ精度:0.7μm、比誘電率:3.4、誘電正接:0.0020、熱線膨張係数の最小値に対する最大値の比が1.4)の両面に、上記実施例および比較例の表面処理銅箔を熱融着法で貼り合せた両面銅張板を作製した。次に、上記両面銅張板の片面の表面処理銅箔をエッチング法で所定の幅(110μm)と長さ(20mm)に直線状にパターンを形成してシグナル層とし、もう一方の銅箔をグラウンド層として、マイクロストリップライン構造の回路基板を作製した。さらに、この回路基板を50℃の循環式オーブン中で24時間乾燥した後、JIS C6481-1996記載の標準環境下で室温まで冷却して、高周波特性評価用回路基板を作製した。
まず、上記液晶ポリマーフィルムを10cm×10cmに切断し、試験片を作製した。次に、この試験片の、比誘電率と誘電正接の測定箇所となる中央部の厚さを、デジタルシクネスゲージ(株式会社ミツトヨ製「SMD-565」、測定子先端直径2mm)を用いて測定した。具体的には、試験片の中心および試験片の中心を中心とする辺4cmの正四角形の頂点となる4点の計5点の厚さを測定し、その算術平均を試験片の厚さとした(以下、液晶ポリマーフィルムの厚さにおいて同じ。)。また、同一の上記液晶ポリマーフィルムから20枚の試験片を切出し、計100点の厚さを測定し、その標準偏差を厚さ精度とした。
まず、上記液晶ポリマーフィルムを10cm×10cmに切断し、これを50℃の循環式オーブン中で24時間乾燥し、JIS C6481-1996記載の標準環境下で室温まで冷却して、測定用試験片を作製した。
上記液晶ポリマーフィルムの熱線膨張係数は、JIS C6481-1996に準拠し、以下の条件で求めた。
[式中、△Lはチャック間距離の変化(mm)であり、Lはチャック間距離(15mm)であり、△Tは温度差(50℃)である。]
厚さ50μmの液晶ポリマーフィルム(同上)の片面に、上記実施例および比較例の表面処理銅箔の粗化面が液晶ポリマーフィルムに接するように積層し、他方の面に離形材としてポリイミドフィルム(宇部興業株式会社製「ユーピレックス20S」)を積層した。この積層体を厚さ2mmの2枚のステンレス板に挟み込み、クッション材として厚さ1mmのステンレス繊維織布をステンレス板の上下に使用して、真空プレス機を用いて、300℃、圧力3MPaで5分間保持することで、片面銅張積層板を得た。
厚さ50μmの液晶ポリマーフィルム(同上)の片面に、厚さ12μmの表面処理銅箔を熱融着法で貼り合せた片面銅張積層板を準備した。
上記の高周波特性、密着性およびレーザー加工性の全てを総合し、下記評価基準に基づき総合評価した。
A(優):全ての評価が優れている。
B(合格):全ての評価が良好である。
C(不合格):少なくとも1つの評価が良好の基準に満たない。
11 表面処理銅箔
111 粗化粒子
13 樹脂基材
15 めっき(めっき層)
20 残留物
30 レーザー光
31 レーザー光の正反射
32 レーザー光の乱反射
40 ブラインドビアホールの底部
Claims (8)
- 銅箔基体の少なくとも一方の面に、粗化粒子が形成された粗化処理表面を少なくとも含む表面処理皮膜を有する表面処理銅箔であって、
前記表面処理銅箔の断面を、走査型電子顕微鏡により観察するとき、
前記表面処理皮膜の表面において、前記粗化粒子の粒子高さの標準偏差が0.16μm以上0.30μm以下であり、かつ、前記粗化粒子の粒子幅に対する粒子高さ比(粒子高さ/粒子幅)の平均値が2.30以上4.00以下であることを特徴とする、表面処理銅箔。 - 前記表面処理皮膜の表面において、前記粗化粒子の粒子高さの平均値が0.50μm以上1.20μm以下である、請求項1に記載の表面処理銅箔。
- 前記表面処理皮膜の表面において、前記粗化粒子の粒子幅に対する粒子高さ比(粒子高さ/粒子幅)の標準偏差が1.20以上2.00以下である、請求項1または2に記載の表面処理銅箔。
- 前記表面処理皮膜の表面において、輝度が10.0以上14.0以下である、請求項1~3のいずれか1項に記載の表面処理銅箔。
- 高周波帯域用プリント配線板に使用するための、請求項1~4のいずれか1項に記載の表面処理銅箔。
- 請求項1~5のいずれか1項に記載の表面処理銅箔を用いて形成された銅張積層板。
- 前記銅張積層板の樹脂基材に使用される樹脂が液晶ポリマーである、請求項6に記載の銅張積層板。
- 請求項6または7に記載の銅張積層板を用いて形成されたプリント配線板。
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JP2018540888A JP6543001B2 (ja) | 2017-03-30 | 2018-03-29 | 表面処理銅箔、並びにこれを用いた銅張積層板およびプリント配線板 |
KR1020197030316A KR102335444B1 (ko) | 2017-03-30 | 2018-03-29 | 표면 처리 동박, 그리고 이를 이용한 동 클래드 적층판 및 프린트 배선판 |
CN201880022508.8A CN110832120B (zh) | 2017-03-30 | 2018-03-29 | 表面处理铜箔、以及使用该表面处理铜箔的覆铜板及印刷电路布线板 |
US16/586,062 US10701811B2 (en) | 2017-03-30 | 2019-09-27 | Surface-treated copper foil, and copper-clad laminate and printed wiring board using same |
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WO2021131359A1 (ja) | 2019-12-24 | 2021-07-01 | 日本電解株式会社 | 表面処理銅箔及びその製造方法 |
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