WO2016035604A1 - 黒色化表面処理銅箔及びキャリア箔付銅箔 - Google Patents
黒色化表面処理銅箔及びキャリア箔付銅箔 Download PDFInfo
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- WO2016035604A1 WO2016035604A1 PCT/JP2015/073789 JP2015073789W WO2016035604A1 WO 2016035604 A1 WO2016035604 A1 WO 2016035604A1 JP 2015073789 W JP2015073789 W JP 2015073789W WO 2016035604 A1 WO2016035604 A1 WO 2016035604A1
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- copper foil
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- blackened
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- copper
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/60—Electroplating characterised by the structure or texture of the layers
- C25D5/605—Surface topography of the layers, e.g. rough, dendritic or nodular layers
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D1/00—Electroforming
- C25D1/04—Wires; Strips; Foils
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/38—Electroplating: Baths therefor from solutions of copper
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- 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
- C25D5/611—Smooth layers
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/627—Electroplating characterised by the visual appearance of the layers, e.g. colour, brightness or mat appearance
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D7/00—Electroplating characterised by the article coated
- C25D7/06—Wires; Strips; Foils
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D7/00—Electroplating characterised by the article coated
- C25D7/06—Wires; Strips; Foils
- C25D7/0614—Strips or foils
Definitions
- the present invention relates to a blackened surface-treated copper foil and a copper foil with a carrier.
- a touch panel is an electronic component that combines an input device that detects the contact position of a fingertip or pen tip on the display surface of a display panel such as a liquid crystal display device. Convenient in that input operations can be performed.
- touch panels such as a resistance film type and a capacitance type depending on the structure and detection method.
- the capacitive touch panel detects the position by detecting the change in capacitance between the fingertip and the conductive film, and takes advantage of the fact that electrostatic coupling occurs when the finger is close to the panel surface.
- electrostatic capacity methods There are two types of electrostatic capacity methods: surface type and projection type.
- the projected capacitive touch panel 10 includes two transparent electrode layers 12 and 12 ′ that are patterned in the x-axis direction and the y-axis direction, with an insulating layer 14 interposed therebetween.
- the touched position is detected from the change in capacitance between the electrodes, and can be detected with high accuracy at multiple points. Therefore, the touched position is employed in portable devices such as smartphones.
- the laminate of transparent electrode layer 12 / insulating layer 14 / transparent electrode layer 12 ′ is sandwiched between a glass substrate 16 and a protective cover 18.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2013-206315 discloses a touch panel sensor that includes striped or meshed copper wirings on portions where the front surface and the back surface of the film need to be seen through.
- the touch panel sensor of Patent Document 1 uses an oxide film on the visible side of the copper wiring to blacken the surface, so that the copper wiring The reflection of the light is kept low, thereby suppressing the decrease in contrast when mounted as a touch panel sensor on the display.
- the formation of the striped or meshed copper wiring is performed by performing patterning by photolithography and etching removal of the copper foil on the laminated body in which the copper foil is bonded to the film, and then the copper wiring is visually recognized.
- the blackening treatment is performed using an alkaline chemical solution on the side of the surface.
- Patent Document 2 discloses a surface-treated copper foil having a nickel-based blackening treatment surface or a cobalt-based blackening treatment surface on the surface of an untreated copper foil.
- Patent Document 3 Japanese Patent Laid-Open No. 2005-187913 discloses a browned surface-treated copper foil having a brown surface formed by copper plating performed in multiple stages.
- the surface-treated copper foil previously blackened or browned as disclosed in the cited document 2 and the cited document 3 can be used as the wiring material for the touch panel sensor, it is advantageous because it is not necessary to separately perform the blackening process. is there.
- the copper wiring of stripe shape etc. like patent document 1 is formed by etching away copper foil, in order to make the image displayed on touch panels, such as a liquid crystal display device clear, copper foil It is important to ensure the transparency of a film (for example, a resin film such as a PET film) at a location where is etched.
- the surface profile such as the surface roughness of the copper foil that existed there was a film. This is because it is inherited by the surface and is greatly influenced by the surface profile of the copper foil.
- the surface-treated copper foil described in Patent Document 2 is excellent in the transparency of the film after etching the copper foil, but is not easily dissolved in copper etching solution than copper, but is nickel-based blackening treatment or cobalt-based blackening. Since the treatment is performed, line variations during etching occur, or the copper etching solution is contaminated, making it difficult to control the solution concentration.
- the surface-treated copper foil described in Patent Document 3 does not include a dissimilar metal that causes etching inhibition on the surface of the browning treatment, the line variation during etching as in the blackening treatment of Patent Literature 2 is less likely to occur.
- the multi-stage burn plating deteriorates the transparency of the film after etching the copper foil, so that the backlight is scattered and the image on the liquid crystal display section is difficult to see clearly.
- the inventors of the present invention have blackened the copper foil by fine roughening using copper particles, thereby reducing the unevenness of the treatment surface and the inclination thereof, thereby bonding the resin film to a stripe or mesh for a touch panel.
- the transparency of the film after copper foil etching can be increased, and a desirable black color sufficient to reduce the visibility of stripes or mesh-like wiring can be realized. Obtained knowledge.
- the object of the present invention is to increase the film transparency after etching a copper foil when it is bonded to a resin film and processed into a stripe or mesh wiring for a touch panel, and the stripe or mesh
- An object of the present invention is to provide a blackened surface-treated copper foil suitable for use as an electrode material for a touch panel, capable of realizing a desirable black color sufficient to reduce the visibility of a wire-like wiring.
- Another object of the present invention is to provide a copper foil with a carrier foil provided with such a blackened surface-treated copper foil.
- a blackened surface-treated copper foil having a treated surface blackened by fine roughening using copper particles,
- the treated surface has a root mean square slope R ⁇ q of a roughness curve measured in accordance with JIS B 0601 (2001) of 25 or less, and conforms to JIS Z 8729 (2004) and JIS Z 8722 (2009).
- a blackened surface-treated copper foil having a lightness L * of L * a * b * color system measured in conformity with 30 or less.
- a copper foil with a carrier foil is provided.
- Blackened surface-treated copper foil The copper foil of the present invention is a blackened surface-treated copper foil.
- This blackened surface-treated copper foil has a treated surface that is blackened by fine roughening using copper particles.
- the roughness curve of the treated surface has small irregularities, and is characterized by the small inclination of the irregularities.
- the treatment surface having a small inclination of the unevenness is defined by a root mean square slope R ⁇ q of the roughness curve measured in accordance with JIS B 0601 (2001) being 25 or less.
- the transparency of the film after etching the copper foil can be significantly increased.
- a resin film for example, a PET film
- this blackened surface-treated copper foil can achieve a desirable black color sufficient to reduce the visibility of stripes or mesh-like wiring, and this characteristic is JIS Z 8729 (2004) and JIS Z 8722 (2009).
- the lightness L * of the L * a * b * color system measured in accordance with the above is defined as 30 or less.
- the copper wiring originally has a high reflectivity due to the specular reflection characteristic of metal, but by blackening the lightness L * as described above, the display image when mounted on a display as a touch panel sensor is clear. Can be.
- the film transparency after copper foil etching can be increased, and the stripe Alternatively, a blackened surface-treated copper foil capable of realizing a desirable black color sufficient to reduce the visibility of the mesh wiring is provided.
- the blackened surface-treated copper foil of the present invention is preferably used as a wiring material for a touch panel sensor, and becomes a better alternative material having a lower resistance than the ITO transparent electrode that has been widely used in conventional touch panel sensors.
- the blackened surface-treated copper foil of the present invention is used as a wiring material for a touch panel sensor, as shown in FIG. 2A, in the configuration in which the copper wiring 22 and the film 24 are laminated (in FIG. 2A, It is preferable to arrange the blackened treated surface 22a facing the film 24 side).
- copper wirings 22 and 22 ′ may be laminated on both surfaces of the film 24. In this case, at least the upper copper wiring 22 ′ is the side that is visually recognized (in FIG.
- the blackened surface-treated copper foil of the present invention has a treated surface that is blackened by fine roughening using copper particles.
- the blackened process surface of this invention is comprised with a copper particle, it is excellent in etching property.
- nickel-based blackening treatment or cobalt-based blackening treatment which is less soluble than copper with respect to the copper etching solution disclosed in Patent Document 2, causes line variations during etching or contamination of the copper etching solution. As a result, it becomes difficult to control the liquid concentration, but such drawbacks are eliminated. Therefore, it is preferable that a copper particle consists of copper and an unavoidable impurity.
- the particle size of the copper particles is not particularly limited.
- the particle diameter of the copper particles is reflected in the surface property parameters such as the root mean square slope R ⁇ q of the roughness curve, the average height Rc of the roughness curve element, the arithmetic average roughness Ra, and the like, and the evaluation is made using those parameters. This is enough.
- the particle diameter of the copper particles is preferably 10 nm to 250 nm.
- the shape of the copper particles is not particularly limited, but is preferably substantially spherical from the viewpoint of effectively preventing powder falling off.
- the treated surface of the blackened surface-treated copper foil of the present invention has a root mean square slope R ⁇ q of the roughness curve of 25 or less.
- R ⁇ q is the root mean square of the local slope dZ / dx at the reference length l of the roughness curve, measured according to JIS B 0601 (2001), and has the following formula: It is prescribed by.
- R ⁇ q is a parameter that averages the slope of the unevenness, and clearly indicates the presence or absence of bumps on the treated surface. That is, when R ⁇ q is too high, it means that the bumps and irregularities are too large, and the transparency of the film after etching the copper foil is deteriorated.
- R ⁇ q when R ⁇ q is 25 or less, bumps and irregularities on the treated surface are reduced, and thus the transparency of the film after the copper foil etching is improved.
- the preferred R ⁇ q is 3 to 25, more preferably 3 to 10, particularly preferably 3 to 8, and most preferably 4 to 7. Within such a range, the transparency of the film after the copper foil etching can be further improved, and it becomes possible to some extent to reduce the amount of fine roughening and make it black with a bump.
- the treated surface of the blackened surface-treated copper foil of the present invention has an L * a * b * color system brightness L * of 30 or less measured according to JIS Z 8729 (2004) and JIS Z 8722 (2009). Preferably, it is 20 or less, more preferably 15 or less, and still more preferably 13 or less. Although a lower limit is not specifically limited, For example, it is 0.5 or more.
- the lightness L * means that the lower the value, the darker the color appears, and the higher the value, the brighter the color appears. In this respect, when it is within the above range, the visibility of the stripe or mesh wiring can be more effectively reduced when it is bonded to a resin film and processed into a stripe or mesh wiring for a touch panel. . As a result, a display image when mounted on a display as a touch panel sensor can be made clear.
- the treated surface of the blackened surface-treated copper foil of the present invention preferably has an XYZ color system Y value of 10 or less measured according to JIS Z 8701 (1999) and JIS Z 8722 (2009). More preferably, it is 5 or less.
- the lower limit is not particularly limited, but is typically 0.5 or more.
- the Y value is called luminous reflectance, and is a parameter having both green and reflectance. Particularly, it is preferable that the Y value is 10 or less in that the phenomenon that the sensor of the display unit is reflected and looks whitish as a result of the low reflectance can be effectively avoided or suppressed.
- the treated surface of the blackened surface-treated copper foil of the present invention has an L * a * b * color system a * value of 4 or less measured according to JIS Z 8729 (2004) and JIS Z 8722 (2009). It is preferably -5, more preferably -5 to 3, and still more preferably -3 to 2.
- the a * value in the L * a * b * color system means that the higher the value, the reddish color tone, but the reddish color tone tends to be noticeable to human eyes.
- the wiring material for the touch panel sensor it can be said that if the a * value is in the above range, redness is not emphasized and the wiring becomes more inconspicuous so that a more desirable color tone is exhibited.
- the treated surface of the blackened surface-treated copper foil of the present invention preferably has an average height Rc of a roughness curve element measured in accordance with JIS B 0601 (2001) of 0.1 to 1.0 ⁇ m.
- the thickness is more preferably 0.1 to 0.8 ⁇ m, further preferably 0.1 to 0.5 ⁇ m, and particularly preferably 0.2 to 0.4 ⁇ m.
- the thickness is within the above range, circuit peeling hardly occurs and the linearity of the circuit pattern is also easily realized when bonded to a resin film and processed into a touch panel stripe or mesh wiring.
- the treated surface of the blackened surface-treated copper foil of the present invention preferably has an arithmetic average roughness Ra measured in accordance with JIS B 0601 (2001) of 0.10 to 0.35 ⁇ m, more preferably 0. .15 to 0.25 ⁇ m, more preferably 0.20 to 0.25 ⁇ m.
- Ra arithmetic average roughness measured in accordance with JIS B 0601 (2001) of 0.10 to 0.35 ⁇ m, more preferably 0. .15 to 0.25 ⁇ m, more preferably 0.20 to 0.25 ⁇ m.
- the blackened surface-treated copper foil of the present invention is bonded to one side of a polyethylene terephthalate resin (PET) film having a thickness of 100 ⁇ m on the treated surface side and then removed by etching.
- PET polyethylene terephthalate resin
- the remaining polyethylene terephthalate resin film has a haze value (Haze) of 60% or less, more preferably 50% or less, still more preferably 45% or less, particularly preferably 20% or less, and most preferably. Is 10% or less.
- a lower limit is not specifically limited, For example, it is 1% or more. Since the haze value means haze, a low haze value as described above means high transparency.
- the blackened surface-treated copper foil having such a configuration is bonded to a resin film and processed into a stripe or mesh wiring for a touch panel, the transparency of the film after etching the copper foil is increased. Can do.
- the haze value was determined by thermo-compressing a blackened surface-treated copper foil and a PET film (thickness 100 ⁇ m) to produce a copper-clad laminate, and then removing the surface-treated copper foil by etching. Using a commercially available haze meter (for example, NDH5000, manufactured by Nippon Denshoku Industries Co., Ltd.), the haze value (Haze: unit%) of the film at 23 ° C. is measured at three locations according to JIS K 7136 (2000). The average value may be obtained.
- the thickness of the blackened surface-treated copper foil of the present invention is not particularly limited, but is preferably 0.1 to 18 ⁇ m, more preferably 0.5 to 10 ⁇ m, still more preferably 0.5 to 7 ⁇ m, and particularly preferably 0.5. -5 ⁇ m, most preferably 0.5-3 ⁇ m.
- the blackened surface-treated copper foil of the present invention is not limited to the surface of the normal copper foil subjected to black roughening, but is obtained by performing black roughening of the copper foil surface of the copper foil with carrier foil. May be.
- blackened surface treated copper foil according to the present invention An example of a preferred method for producing a blackened surface treated copper foil according to the present invention will be described.
- the blackened surface treated copper foil according to the present invention is not limited to the method described below, and copper particles As long as fine roughening using is performed, it may be produced by any method.
- the copper foil As copper foil used for manufacture of blackened surface-treated copper foil, both electrolytic copper foil and rolled copper foil can be used. Further, the copper foil may be a non-roughened copper foil or a pre-roughened copper foil.
- the thickness of the copper foil is not particularly limited, but is preferably 0.1 to 18 ⁇ m, more preferably 0.5 to 10 ⁇ m, still more preferably 0.5 to 7 ⁇ m, particularly preferably 0.5 to 5 ⁇ m, and most preferably 0. .5-3 ⁇ m.
- the copper foil is prepared in the form of a copper foil with a carrier foil
- the copper foil is a wet film forming method such as an electroless copper plating method and an electrolytic copper plating method, a dry film forming method such as sputtering and chemical vapor deposition, Alternatively, it may be formed by a combination thereof.
- the surface of the copper foil to be finely roughened with copper particles preferably has a maximum waviness difference (Wmax) of 2.0 ⁇ m or less, more preferably 1.2 ⁇ m or less, and still more preferably 0.8. 8 ⁇ m or less.
- Wmax maximum waviness difference
- a lower limit is not specifically limited, For example, it is 0.1 micrometer or more.
- the slope of the irregularities defined by the root mean square slope R ⁇ q of the roughness curve can be reduced, and the resin film (eg, PET film) can be reduced.
- the transparency of the film after etching the copper foil can be significantly increased.
- the “maximum undulation height difference (Wmax)” is the height difference in the waveform data extracted by filtering the waveform data relating to undulation from the information on the unevenness of the sample surface obtained using a three-dimensional surface structure analysis microscope. (The sum of the maximum peak height and the maximum valley depth of the waveform). For example, zygogNew View 5032 (manufactured by Zygo) is used as a measuring instrument, and Metro Pro Ver. With 8.0.2, the low frequency filter can be measured by employing the condition of 11 ⁇ m.
- Black roughening At least one surface of the copper foil is blackened by fine roughening using copper particles. This black roughening is performed by electrolysis using a black roughening copper electrolytic solution.
- a preferred black roughening copper electrolytic solution is an electrolytic solution having a copper concentration of 10 to 20 g / L, a free sulfuric acid concentration of 30 to 100 g / L, and a chlorine concentration of 20 to 100 ppm.
- the electrodeposition rate of the copper particles is slow, which is not preferable because it does not satisfy industrially required productivity.
- the copper concentration exceeds 20 g / L, it is not preferable because it approaches smooth plating conditions and makes it difficult to roughen the black in relation to the current density described later. If the concentration of free sulfuric acid deviates from this concentration range due to the relationship with the copper concentration, the current-carrying characteristics during electrolysis change and it becomes difficult to achieve good black roughening.
- additives include a combination of polyethylene glycol and bis (3-sulfopropyl) disulfide, sodium polyacrylate, and the like.
- polyethylene glycol and bis (3-sulfopropyl) disulfide are preferably added to the black roughening copper electrolytic solution at a concentration of 10 to 500 ppm, respectively.
- Sodium polyacrylate is preferably added to the black roughening copper electrolytic solution at a concentration of 10 to 1000 ppm.
- Electrolysis using the black roughening copper electrolytic solution is performed in an electrolytic solution having a solution temperature of 20 to 40 ° C., with the copper foil being polarized to the cathode and a current density of 30 to 100 A / dm 2 and a time of 2 to 10 sec. Is preferred.
- the solution temperature is less than 20 ° C., the shape of the coarse particles to be formed tends to vary, which is not preferable.
- the solution temperature exceeds 40 ° C., the solution property of the black roughening copper electrolytic solution tends to change, and there is a tendency that stable fine roughening cannot be performed.
- the current density is less than 30 A / dm 2 , it is not preferable because sufficient black roughening cannot be performed and it becomes difficult to set the lightness L * of the black roughened surface to 30 or less.
- the current density exceeds 100 A / dm 2 , the precipitation rate of fine copper particles becomes excessive, and the shape of the formed copper particles does not become a good spherical body, which is not preferable.
- the copper foil after the roughening of black may be subjected to a rust prevention treatment.
- the rust prevention treatment preferably includes a plating treatment using zinc.
- the plating treatment using zinc may be either a zinc plating treatment or a zinc alloy plating treatment, and the zinc alloy plating treatment is particularly preferably a zinc-nickel alloy treatment.
- the zinc-nickel alloy treatment may be a plating treatment containing at least Ni and Zn, and may further contain other elements such as Sn, Cr, and Co.
- the Ni / Zn adhesion ratio in the zinc-nickel alloy plating is preferably 1.2 to 10, more preferably 2 to 7, and still more preferably 2.7 to 4 in terms of mass ratio.
- the rust prevention treatment preferably further includes a chromate treatment, and this chromate treatment is more preferably performed on the surface of the plating containing zinc after the plating treatment using zinc.
- rust prevention property can further be improved.
- a particularly preferable antirust treatment is a combination of a zinc-nickel alloy plating treatment and a subsequent chromate treatment.
- the copper foil may be treated with a silane coupling agent to form a silane coupling agent layer.
- a silane coupling agent layer can be formed by appropriately diluting and applying a silane coupling agent and drying.
- silane coupling agents include epoxy-functional silane coupling agents such as 4-glycidylbutyltrimethoxysilane and ⁇ -glycidoxypropyltrimethoxysilane, or ⁇ -aminopropyltriethoxysilane, N- ⁇ (amino Amino functions such as ethyl) ⁇ -aminopropyltrimethoxysilane, N-3- (4- (3-aminopropoxy) butoxy) propyl-3-aminopropyltrimethoxysilane, N-phenyl- ⁇ -aminopropyltrimethoxysilane Silane coupling agent, or mercapto functional silane coupling agent such as ⁇ -mercaptopropyltrimethoxysilane, or olefin functional silane coupling agent such as vinyltrimethoxysilane, vinylphenyltrimethoxysilane, or ⁇ -methacryloxypropyl Trimetoki Acrylic-functional silane coupling
- the blackened surface-treated copper foil of the present invention can be provided in the form of a copper foil with carrier foil.
- a copper foil with carrier foil is a carrier foil, a release layer provided on the carrier foil, and the blackened surface-treated copper of the present invention provided on the release layer with the blackened treatment surface outside. It is provided with foil.
- the copper foil with carrier foil can employ a known layer configuration except that the blackened surface-treated copper foil of the present invention is used.
- the carrier foil is a foil for supporting the blackened surface-treated copper foil and improving its handleability.
- the carrier foil include an aluminum foil, a copper foil, a resin film whose surface is metal-coated, and the like, and preferably a copper foil.
- the copper foil may be a rolled copper foil or an electrolytic copper foil.
- the thickness of the carrier foil is typically 200 ⁇ m or less, preferably 18 ⁇ m to 200 ⁇ m.
- the release layer is a layer having a function of weakening the peeling strength of the carrier foil, ensuring the stability of the strength, and further suppressing interdiffusion that may occur between the carrier foil and the copper foil during press molding at a high temperature. It is.
- the release layer is generally formed on one side of the carrier foil, but may be formed on both sides.
- the release layer may be either an organic release layer or an inorganic release layer. Examples of organic components used in the organic release layer include nitrogen-containing organic compounds, sulfur-containing organic compounds, carboxylic acids and the like. Examples of nitrogen-containing organic compounds include triazole compounds, imidazole compounds, and the like. Among these, triazole compounds are preferred in terms of easy release stability.
- triazole compounds examples include 1,2,3-benzotriazole, carboxybenzotriazole, N ′, N′-bis (benzotriazolylmethyl) urea, 1H-1,2,4-triazole and 3-amino- And 1H-1,2,4-triazole.
- sulfur-containing organic compound examples include mercaptobenzothiazole, thiocyanuric acid, 2-benzimidazolethiol and the like.
- carboxylic acid examples include monocarboxylic acid and dicarboxylic acid.
- examples of inorganic components used in the inorganic release layer include Ni, Mo, Co, Cr, Fe, Ti, W, P, Zn, and a chromate-treated film.
- the release layer may be formed by bringing a release layer component-containing solution into contact with at least one surface of the carrier foil and fixing the release layer component to the surface of the carrier foil.
- the contact of the carrier foil with the release layer component-containing solution may be performed by immersion in the release layer component-containing solution, spraying of the release layer component-containing solution, flowing down of the release layer component-containing solution, or the like.
- the release layer component may be fixed to the surface of the carrier foil by drying the release layer component-containing solution, electrodeposition of the release layer component in the release layer component-containing solution, or the like.
- the thickness of the release layer is typically 1 nm to 1 ⁇ m, preferably 5 nm to 500 nm.
- the blackened surface-treated copper foil of the present invention described above is used as the blackened surface-treated copper foil.
- the blackened surface-treated copper foil of the present invention has been subjected to fine roughening (blackening) using copper particles, but as a procedure, first, a copper layer is formed on the surface of the release layer as a copper foil, Thereafter, at least fine roughening (blackening) may be performed.
- the details of the fine roughening (blackening) are as described above.
- copper foil is comprised with the form of an ultra-thin copper foil in order to utilize the advantage as copper foil with a carrier.
- a preferable thickness of the ultrathin copper foil is 0.1 ⁇ m to 7 ⁇ m, more preferably 0.5 ⁇ m to 5 ⁇ m, and still more preferably 0.5 ⁇ m to 3 ⁇ m.
- auxiliary metal layer is preferably made of nickel and / or cobalt.
- the thickness of the auxiliary metal layer is preferably 0.001 to 3 ⁇ m.
- Example 1 Blackened surface-treated copper foil Production and evaluation of a blackened surface-treated copper foil were performed as follows.
- ⁇ Maximum wave height difference (Wmax)> Zygo New View 5032 (manufactured by Zygo) was used as a measuring instrument, and Metro Pro Ver.
- the maximum height difference (Wmax) of the waviness was measured by using the condition of 11 ⁇ m for the low frequency filter using 8.0.2.
- the surface to be measured of the surface-treated copper foil is fixed in close contact with the sample stage, and 6 fields of 108 ⁇ m ⁇ 144 ⁇ m are selected and measured within the 1 cm square range of the sample piece, and 6 measurements are made.
- the average value of the maximum height difference (Wmax) of the swell obtained from the points was adopted as a representative value.
- Rust prevention treatment consisting of inorganic rust prevention treatment and chromate treatment was performed on both surfaces of the electrolytic copper foil after blackening.
- an inorganic rust prevention treatment using a pyrophosphate bath, potassium pyrophosphate concentration 80 g / L, zinc concentration 0.2 g / L, nickel concentration 2 g / L, liquid temperature 40 ° C., current density 0.5 A / dm 2 Zinc-nickel alloy rust prevention treatment was performed.
- a chromate treatment a chromate layer was further formed on the zinc-nickel alloy rust preventive treatment. This chromate treatment was performed at a chromic acid concentration of 1 g / L, pH 11, a solution temperature of 25 ° C., and a current density of 1 A / dm 2 .
- Silane coupling agent treatment The copper foil subjected to the above rust prevention treatment is washed with water, and then immediately treated with a silane coupling agent to adsorb the silane coupling agent on the rust prevention treatment layer on the black roughened surface. It was.
- this silane coupling agent treatment pure water is used as a solvent, a solution having a 3-aminopropyltrimethoxysilane concentration of 3 g / L is used, and this solution is sprayed onto the black roughened surface by showering to perform an adsorption treatment. went. After adsorption of the silane coupling agent, water was finally evaporated by an electric heater to obtain a blackened surface-treated copper foil having a thickness of 12 ⁇ m.
- ⁇ Haze value> A surface-treated copper foil and a PET film (thickness 100 ⁇ m) were thermocompression bonded to produce a copper-clad laminate. Thereafter, the surface-treated copper foil was removed by etching, and the remaining PET film was filmed at 23 ° C. according to JIS K 7136 (2000) using a haze meter (NDH5000, manufactured by Nippon Denshoku Industries Co., Ltd.). The haze value (Haze: unit%) was measured at three locations, and the average value was obtained.
- Example 2 A blackened surface-treated copper foil was prepared and evaluated in the same manner as in Example 1 except that the blackening was performed on the electrode surface side of the electrolytic copper foil.
- Example 3 Preparation and evaluation of the copper foil with carrier foil provided with the blackened surface-treated copper foil were performed as follows.
- the carrier copper foil on which the organic release layer was formed was immersed in a solution containing 20 g / l nickel and 300 g / l potassium pyrophosphate prepared using nickel sulfate, and the liquid temperature was 45.
- Nickel having a deposition amount corresponding to a thickness of 0.002 ⁇ m was deposited on the organic release layer under the conditions of ° C., pH 3, and current density 5 A / dm 2 .
- a nickel layer was formed as an auxiliary metal layer on the organic release layer.
- the carrier copper foil on which the auxiliary metal layer is formed is immersed in an acidic copper sulfate solution and electrolyzed for 60 seconds under a smooth plating condition with a current density of 8 A / dm 2 to obtain a thickness of 3 ⁇ m.
- the ultrathin copper foil was formed on the auxiliary metal layer.
- the maximum height difference (Wmax) of the waviness of the deposited surface of this ultrathin copper foil was 1.1 ⁇ m.
- Black roughening For the precipitation surface of the ultrathin copper foil, a black roughening copper electrolytic solution having the composition shown below was used, and the solution temperature was 30 ° C., the current density was 50 A / dm 2 , and the time was 4 sec. Electrolysis was performed under conditions to perform black roughening.
- Rust prevention treatment consisting of inorganic rust prevention treatment and chromate treatment was performed on both surfaces of the ultrathin copper foil with carrier foil after black roughening.
- inorganic rust prevention treatment using a pyrophosphate bath, potassium pyrophosphate concentration 80 g / L, zinc concentration 0.2 g / L, nickel concentration 2 g / L, liquid temperature 40 ° C., current density 0.5 A / dm 2 Zinc-nickel alloy rust prevention treatment was performed.
- a chromate treatment a chromate layer was further formed on the zinc-nickel alloy rust preventive treatment. This chromate treatment was performed at a chromic acid concentration of 1 g / L, pH 11, a solution temperature of 25 ° C., and a current density of 1 A / dm 2 .
- Silane coupling agent treatment The copper foil that has been subjected to the above rust prevention treatment is washed with water and then immediately treated with a silane coupling agent to adsorb the silane coupling agent on the rust prevention treatment layer on the black roughened surface. It was.
- this silane coupling agent treatment pure water is used as a solvent, a solution having a 3-aminopropyltrimethoxysilane concentration of 3 g / L is used, and this solution is sprayed onto the black roughened surface by showering to perform an adsorption treatment. went. After the adsorption of the silane coupling agent, moisture was finally diffused by an electric heater to obtain a copper foil with a carrier foil, which was provided with a blackened surface-treated ultrathin copper foil having a thickness of 3 ⁇ m.
- Example 4 (Comparison) A browned surface-treated copper foil was prepared and evaluated in the same manner as in Example 1 except that the browning treatment described below was performed on the electrode surface side of the electrolytic copper foil instead of the black roughening.
- This basic plating treatment is performed by electrolysis under a burn plating condition of a current density (Ia) of 10 A / dm 2 using a copper sulfate solution having a copper concentration of 18 g / l, a free sulfuric acid concentration of 100 g / l, and a liquid temperature of 25 ° C. It was.
- Ia current density
- the burn plating performed in this basic plating process only formed nuclei for forming a certain degree of irregularities on the copper foil surface, and the electrodeposition amount was 300 mg / m 2 in terms of converted thickness.
- (B) Additional plating treatment process The surface of the copper foil thus subjected to the basic plating treatment was subjected to a single plating treatment using a copper sulfate-based plating solution under burn plating conditions.
- the additional plating treatment at this time was performed using a copper sulfate solution having the same concentration and temperature as in the step (a).
- the current density (Ib) employed when burning plating is 1.5 A / dm 2 which is 15% of Ia, and the current concentration on the nucleus formed on the surface of the copper foil in step (a) To prevent unnecessary abnormal precipitation.
- the electrodeposition amount in this additional plating step was an electrodeposition amount of 50 mg / m 2 as a converted thickness.
- (C) Cover plating treatment step The copper foil surface thus subjected to burnt plating was subjected to a cover plating treatment under a smooth plating condition using a copper plating solution.
- This coating plating was performed by electrolysis under a smooth plating condition with a current density of 15 A / dm 2 using a copper sulfate solution having a copper concentration of 65 g / l, a free sulfuric acid concentration of 150 g / l, and a liquid temperature of 45 ° C. In this way, the surface roughened in steps (a) and (b) was smoothed.
- the converted thickness of the smooth plating at this time was 4 g / m 2 .
- (D) Finish plating process The surface subjected to the smooth plating process is subjected to a finish plating process for finishing the copper foil surface brown by using the copper plating solution under the condition of burnt plating.
- This ultrafine copper grain was formed by adding 9-phenylacridine, a copper concentration of 13 g / l, free sulfuric acid 50 g / l, 9-phenylacridine 150 mg / l, chlorine concentration 28 ppm, and a liquid temperature of 35 ° C.
- the electrodeposition amount in the finish plating process was 300 mg / m 2 as the converted thickness.
- Example 5 (Comparison) A surface-treated copper foil was prepared and evaluated in the same manner as in Example 2 except that black roughening was not performed.
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Abstract
Description
前記処理表面は、JIS B 0601(2001)に準拠して測定される、粗さ曲線の二乗平均平方根傾斜RΔqが25以下であり、かつ、JIS Z 8729(2004)及びJIS Z 8722(2009)に準拠して測定されるL*a*b*表色系の明度L*が30以下である、黒色化表面処理銅箔が提供される。
本発明の銅箔は黒色化表面処理銅箔である。この黒色化表面処理銅箔は、銅粒子を用いた微細粗化により黒色化された処理表面を有する。銅粒子を用いた微細粗化により黒色化されることで処理表面の粗さ曲線は凹凸が小さいものとなっており、とりわけ凹凸の傾きが小さいことで特性付けられる。この凹凸の傾きが小さい処理表面は、JIS B 0601(2001)に準拠して測定される、粗さ曲線の二乗平均平方根傾斜RΔqが25以下であることによって規定される。このような凹凸の傾き、すなわちRΔqが小さいことで、樹脂フィルム(例えばPETフィルム)に貼り合わせてタッチパネル用のストライプ又はメッシュ状の配線に加工された場合に、銅箔エッチング後のフィルムの透明性を有意に高くすることができる。前述のとおり、液晶表示装置等のタッチパネルに表示される画像を鮮明に表示させるためには銅箔エッチング後のフィルムの透明性の確保が重要となるが、本発明の黒色化表面処理銅箔を用いることでこのフィルムの透明性を実現することができる。しかも、この黒色化表面処理銅箔はストライプ又はメッシュ状配線の視認性を低減するのに十分な望ましい黒色を実現できるものであり、この特性はJIS Z 8729(2004)及びJIS Z 8722(2009)に準拠して測定されるL*a*b*表色系の明度L*が30以下であることによって規定される。前述のとおり、銅配線は本来、金属特有の鏡面反射のため反射率が高くなるが、上記のような明度L*に黒色化することで、タッチパネルセンサーとしてディスプレイに搭載した時の表示画像を鮮明にすることができる。このように、本発明によれば、樹脂フィルムに貼り合わせてタッチパネル用のストライプ又はメッシュ状の配線に加工された場合に、銅箔エッチング後のフィルム透明性を高くすることができ、なおかつ、ストライプ又はメッシュ状配線の視認性を低減するのに十分な望ましい黒色を実現することが可能な黒色化表面処理銅箔が提供される。
本発明による黒色化表面処理銅箔の好ましい製造方法の一例を説明するが、本発明による黒色化表面処理銅箔は以下に説明する方法に限らず、銅粒子を用いた微細粗化が行われるかぎり、あらゆる方法によって製造されたものであってよい。
黒色化表面処理銅箔の製造に使用する銅箔として、電解銅箔及び圧延銅箔の双方の使用が可能である。また、銅箔は、無粗化の銅箔であってもよいし、予備的粗化を施したものであってもよい。銅箔の厚さは特に限定されないが、0.1~18μmが好ましく、より好ましくは0.5~10μm、さらに好ましくは0.5~7μm、特に好ましくは0.5~5μm、最も好ましくは0.5~3μmである。銅箔がキャリア箔付銅箔の形態で準備される場合には、銅箔は、無電解銅めっき法及び電解銅めっき法等の湿式成膜法、スパッタリング及び化学蒸着等の乾式成膜法、又はそれらの組合せにより形成したものであってよい。
銅粒子を用いた微細粗化により、銅箔の少なくとも一方の表面を黒色化させる。この黒色粗化は、黒色粗化用銅電解溶液を用いた電解により行われる。好ましい黒色粗化用銅電解溶液は、銅濃度10~20g/L、フリー硫酸濃度30~100g/L、塩素濃度20~100ppmの電解溶液である。ここで、銅濃度が10g/L未満の場合には、銅粒子の電着速度が遅くなり、工業的に要求される生産性を満足しないため好ましくない。一方、銅濃度が20g/Lを超えると、後述する電流密度との関係で、平滑めっき条件に近づき、黒色粗化が困難となるため好ましくない。そして、フリー硫酸濃度は、この銅濃度との関係で、この濃度範囲を逸脱すると、電解時の通電特性が変化して、良好な黒色粗化が困難となるため好ましくない。
所望により、黒色粗化後の銅箔に防錆処理を施してもよい。防錆処理は、亜鉛を用いためっき処理を含むのが好ましい。亜鉛を用いためっき処理は、亜鉛めっき処理及び亜鉛合金めっき処理のいずれであってもよく、亜鉛合金めっき処理は亜鉛-ニッケル合金処理が特に好ましい。亜鉛-ニッケル合金処理は少なくともNi及びZnを含むめっき処理であればよく、Sn、Cr、Co等の他の元素をさらに含んでいてもよい。亜鉛-ニッケル合金めっきにおけるNi/Zn付着比率は、質量比で、1.2~10が好ましく、より好ましくは2~7、さらに好ましくは2.7~4である。また、防錆処理はクロメート処理をさらに含むのが好ましく、このクロメート処理は亜鉛を用いためっき処理の後に、亜鉛を含むめっきの表面に行われるのがより好ましい。こうすることで防錆性をさらに向上させることができる。特に好ましい防錆処理は、亜鉛-ニッケル合金めっき処理とその後のクロメート処理との組合せである。
所望により、銅箔にシランカップリング剤処理を施し、シランカップリング剤層を形成してもよい。これにより耐湿性、耐薬品性及び接着剤等との密着性等を向上することができる。シランカップリング剤層は、シランカップリング剤を適宜希釈して塗布し、乾燥させることにより形成することができる。シランカップリング剤の例としては、4-グリシジルブチルトリメトキシシラン、γ-グリシドキシプロピルトリメトキシシラン等のエポキシ官能性シランカップリング剤、又はγ-アミノプロピルトリエトキシシラン、N-β(アミノエチル)γ-アミノプロピルトリメトキシシラン、N-3-(4-(3-アミノプロポキシ)ブトキシ)プロピル-3-アミノプロピルトリメトキシシラン、N-フェニル-γ-アミノプロピルトリメトキシシラン等のアミノ官能性シランカップリング剤、又はγ-メルカプトプロピルトリメトキシシラン等のメルカプト官能性シランカップリング剤又はビニルトリメトキシシラン、ビニルフェニルトリメトキシシラン等のオレフィン官能性シランカップリング剤、又はγ-メタクリロキシプロピルトリメトキシシラン等のアクリル官能性シランカップリング剤、又はイミダゾールシラン等のイミダゾール官能性シランカップリング剤、又はトリアジンシラン等のトリアジン官能性シランカップリング剤等が挙げられる。
本発明の黒色化表面処理銅箔は、キャリア箔付銅箔の形態で提供することができる。特に、タッチパネルセンサーとしてディスプレイに搭載した時の表示画像を鮮明にするために、より狭い回路パターン幅や銅配線の高さを5μm以下とする場合には、薄い銅箔を用いることになるため、ハンドリング性向上の観点から、キャリア付銅箔を用いることが好ましい。この場合、キャリア箔付銅箔は、キャリア箔と、このキャリア箔上に設けられた剥離層と、この剥離層上に黒色化処理表面を外側にして設けられた本発明の黒色化表面処理銅箔とを備えてなる。もっとも、キャリア箔付銅箔は、本発明の黒色化表面処理銅箔を用いること以外は、公知の層構成が採用可能である。
黒色化表面処理銅箔の作製及び評価を以下のようにして行った。
銅電解液として以下に示される組成の硫酸酸性硫酸銅溶液を用い、陰極に表面粗さRaが0.20μmのチタン製の回転電極を用い、陽極にはDSA(寸法安定性陽極)を用いて、溶液温度45℃、電流密度55A/dm2で電解し、厚さ12μmの電解銅箔を得た。この電解銅箔の析出面のうねりの最大高低差(Wmax)は0.8μm、電極面のうねりの最大高低差(Wmax)は1.5μmであった。
<硫酸酸性硫酸銅溶液の組成>
‐ 銅濃度:80g/L
‐ フリー硫酸濃度:140g/L
‐ ビス(3-スルホプロピル)ジスルフィド濃度:30mg/L
‐ ジアリルジメチルアンモニウムクロライド重合体濃度:50mg/L
‐ 塩素濃度:40mg/L
測定機器としてzygo New View 5032(Zygo社製)を用い、解析ソフトにMetro Pro Ver.8.0.2を用いて、低周波フィルタを11μmの条件を採用して、うねりの最大高低差(Wmax)を測定した。このとき、表面処理銅箔の被測定面を試料台に密着させて固定し、試料片の1cm角の範囲内の中で108μm×144μmの視野を6点選択して測定し、6箇所の測定点から得られたうねりの最大高低差(Wmax)の平均値を代表値として採用した。
上述の電解銅箔が備える電極面及び析出面の内、析出面側に対して、以下に示される組成の黒色粗化用銅電解溶液を用い、溶液温度30℃、電流密度50A/dm2、時間4secの条件で電解して、黒色粗化を行った。
<黒色粗化用銅電解溶液の組成>
‐ 銅濃度:13g/L
‐ フリー硫酸濃度:70g/L
‐ 塩素濃度:35mg/L
‐ ポリエチレングリコール濃度:100ppm
‐ ビス(3-スルホプロピル)ジスルフィド濃度:100ppm
黒色粗化後の電解銅箔の両面に、無機防錆処理及びクロメート処理からなる防錆処理を行った。まず、無機防錆処理として、ピロリン酸浴を用い、ピロリン酸カリウム濃度80g/L、亜鉛濃度0.2g/L、ニッケル濃度2g/L、液温40℃、電流密度0.5A/dm2で亜鉛-ニッケル合金防錆処理を行った。次いで、クロメート処理として、亜鉛-ニッケル合金防錆処理の上に、更にクロメート層を形成した。このクロメート処理は、クロム酸濃度が1g/L、pH11、溶液温度25℃、電流密度1A/dm2で行った。
上記防錆処理が施された銅箔を水洗し、その後直ちにシランカップリング剤処理を行い、黒色粗化面の防錆処理層上にシランカップリング剤を吸着させた。このシランカップリング剤処理は、純水を溶媒とし、3-アミノプロピルトリメトキシシラン濃度が3g/Lの溶液を用い、この溶液をシャワーリングにて黒色粗化面に吹き付けて吸着処理することにより行った。シランカップリング剤の吸着後、最終的に電熱器により水分を蒸発させ、厚さ12μmの黒色化表面処理銅箔を得た。
得られた黒色化表面処理銅箔について、各種特性の評価を以下のとおり行った。
光学測定装置としてレーザー顕微鏡(オリンパス製、OLS4100)を用い、JIS B 0601(2001)に準拠して、表面処理銅箔の表面性状パラメータRΔq、Rc及びRaを測定した。この測定は、評価長さを642μmとし、銅箔の幅方向で測定を行った。ここで、銅箔の幅方向は、電解銅箔製造時の回転陰極の幅方向(TD方向)に対応する。
分光色彩計(日本電色工業株式会社製、SE6000)を用いて、明度L*及び色度a*をJIS Z 8729(2004)及びJIS Z 8722(2009)に準拠して、Y値をJIS Z 8701(1999)及びJIS Z 8722(2009)に準拠して測定した。
表面処理銅箔とPETフィルム(厚さ100μm)とを熱圧着して銅張積層板を作製した。その後、当該表面処理銅箔をエッチング除去し、残ったPETフィルムを、ヘイズメーター(日本電色工業株式会社製、NDH5000)を用いて、JIS K 7136(2000)に準じて、23℃でのフィルムのヘイズ値(Haze:単位%)を3箇所測定し、その平均値を求めた。
黒色粗化を電解銅箔の電極面側に対して行ったこと以外は、例1と同様にして黒色化表面処理銅箔の作製及び評価を行った。
黒色化表面処理銅箔を備えたキャリア箔付銅箔の作製及び評価を以下のようにして行った。
銅電解液として以下に示される組成の硫酸酸性硫酸銅溶液を用い、陰極に表面粗さRaが0.20μmのチタン製の回転電極を用い、陽極にはDSA(寸法安定性陽極)を用いて、溶液温度45℃、電流密度55A/dm2で電解し、厚さ12μmの電解銅箔をキャリア箔として得た。
<硫酸酸性硫酸銅溶液の組成>
‐ 銅濃度:80g/L
‐ フリー硫酸濃度:140g/L
‐ ビス(3-スルホプロピル)ジスルフィド濃度:30mg/L
‐ ジアリルジメチルアンモニウムクロライド重合体濃度:50mg/L
‐ 塩素濃度:40mg/L
酸洗処理されたキャリア用銅箔の電極面側を、CBTA(カルボキシベンゾトリアゾール)1000重量ppm、硫酸150g/l及び銅10g/lを含むCBTA水溶液に、液温30℃で30秒間浸漬して引き上げ、CBTA成分をキャリア箔の電極面に吸着させた。こうして、キャリア用銅箔の光沢面の表面にCBTA層を有機剥離層として形成した。
有機剥離層が形成されたキャリア用銅箔を、硫酸ニッケルを用いて作製されたニッケル20g/l及びピロリン酸カリウム300g/lを含む溶液に浸漬して、液温45℃、pH3、電流密度5A/dm2の条件で、厚さ0.002μm相当の付着量のニッケルを有機剥離層上に付着させた。こうして有機剥離層上にニッケル層を補助金属層として形成した。
補助金属層が形成されたキャリア用銅箔を、酸性硫酸銅溶液に浸漬して、電流密度8A/dm2の平滑めっき条件で60秒間電解して、厚さ3μmの極薄銅箔を補助金属層上に形成した。この極薄銅箔の析出面のうねりの最大高低差(Wmax)は1.1μmであった。
上述の極薄銅箔の析出面に対して、以下に示される組成の黒色粗化用銅電解溶液を用い、溶液温度30℃、電流密度50A/dm2、時間4secの条件で電解して、黒色粗化を行った。
<黒色粗化用銅電解溶液の組成>
‐ 銅濃度:13g/L
‐ フリー硫酸濃度:70g/L
‐ 塩素濃度:35mg/L
‐ ポリアクリル酸ナトリウム濃度:400ppm
黒色粗化後のキャリア箔付極薄銅箔の両面に、無機防錆処理及びクロメート処理からなる防錆処理を行った。まず、無機防錆処理として、ピロリン酸浴を用い、ピロリン酸カリウム濃度80g/L、亜鉛濃度0.2g/L、ニッケル濃度2g/L、液温40℃、電流密度0.5A/dm2で亜鉛-ニッケル合金防錆処理を行った。次いで、クロメート処理として、亜鉛-ニッケル合金防錆処理の上に、更にクロメート層を形成した。このクロメート処理は、クロム酸濃度が1g/L、pH11、溶液温度25℃、電流密度1A/dm2で行った。
上記防錆処理が施された銅箔を水洗し、その後直ちにシランカップリング剤処理を行い、黒色粗化面の防錆処理層上にシランカップリング剤を吸着させた。このシランカップリング剤処理は、純水を溶媒とし、3-アミノプロピルトリメトキシシラン濃度が3g/Lの溶液を用い、この溶液をシャワーリングにて黒色粗化面に吹き付けて吸着処理することにより行った。シランカップリング剤の吸着後、最終的に電熱器により水分を気散させ、厚さ3μmの黒色化表面処理極薄銅箔を備えた、キャリア箔付銅箔を得た。
得られた黒色化表面処理銅箔を備えたキャリア箔付銅箔について、各種特性の評価を例1と同様にして行った。
黒色粗化の代わりに以下に述べる褐色化処理を電解銅箔の電極面側に対して行ったこと以外は、例1と同様にして褐色化表面処理銅箔の作製及び評価を行った。
まず、粗化処理を施していない電解銅箔(例1(1)で作製されたもの)を、硫酸濃度150g/l、液温30℃の希硫酸溶液に30秒間浸漬して、表面の清浄化を行った。こうして清浄化された電解銅箔に対して、以下に示される工程(a)~(e)をこの順に施すことにより褐色化処理を行った。
上記電解銅箔の電極面側に対して、硫酸銅系めっき溶液をヤケめっき条件で用いて、銅箔の表面を褐色にするための基礎めっき処理を行った。この基礎めっき処理は、銅濃度18g/l、フリー硫酸濃度100g/l、液温25℃の硫酸銅溶液を用いて、電流密度(Ia)10A/dm2のヤケめっき条件で電解することにより行った。その結果、この基礎めっき工程で行ったヤケめっきは、ある程度の凹凸を銅箔表面に形成するための核を形成したのみであり、換算厚さ300mg/m2の電着量であった。
こうして基礎めっき処理された銅箔の表面に、硫酸銅系めっき溶液をヤケめっき条件で用いて1回のめっき処理を施した。このときの追加めっき処理は上記工程(a)と同様の濃度及び液温の硫酸銅溶液を用いて行った。このとき、ヤケめっきを行う際に採用する電流密度(Ib)をIaの15%の電流密度となる1.5A/dm2として、工程(a)で銅箔の表面に形成した核に対する電流集中を防止して無用な異常析出を防止した。この追加めっき工程での電着量は、換算厚さとして50mg/m2の電着量とした。
こうしてヤケめっきを施した銅箔面に、銅めっき溶液を用いて平滑めっき条件で被覆めっき処理を行った。この被覆めっきは、銅濃度65g/l、フリー硫酸濃度150g/l、液温45℃の硫酸銅溶液を用いて、電流密度15A/dm2の平滑めっき条件で電解することにより行った。このようにして、工程(a)及び(b)で粗化処理した表面を滑らかにした。このときの平滑めっきの換算厚さは4g/m2であった。
こうして平滑めっき処理が施された表面に、銅めっき溶液をヤケめっき条件で用いて、銅箔表面を褐色に仕上げるための仕上げめっき処理を施し、それにより極微細銅粒を付着形成した。この極微細銅粒の形成は、9-フェニルアクリジンを添加した、銅濃度が13g/l、フリー硫酸50g/l、9-フェニルアクリジン150mg/l、塩素濃度28ppm、液温35℃の硫酸銅溶液を用いて、電流密度24A/dm2 の電解条件で行った。この仕上げめっき処理工程での電着量は、換算厚さとして300mg/m2の電着量とした。
こうして仕上げめっきが施された銅箔に対して、十分に純水をシャワーリングして洗浄を行い、電熱器により雰囲気温度を150℃とした乾燥炉内に4秒間滞留させ、水分を発させて褐色化処理面を備えた表面処理銅箔を得た。なお、水洗は、この工程に限らず、前述した各工程の間で前工程の溶液を後工程に持ち込まないように適宜行った。
黒色粗化を行わなかったこと以外は例2と同様にして、表面処理銅箔の作製及び評価を行った。
Claims (11)
- 銅粒子を用いた微細粗化により黒色化された処理表面を有する黒色化表面処理銅箔であって、
前記処理表面は、JIS B 0601(2001)に準拠して測定される、粗さ曲線の二乗平均平方根傾斜RΔqが25以下であり、かつ、JIS Z 8729(2004)及びJIS Z 8722(2009)に準拠して測定されるL*a*b*表色系の明度L*が30以下である、黒色化表面処理銅箔。 - 前記処理表面は、JIS Z 8701(1999)及びJIS Z 8722(2009)に準拠して測定されるXYZ表色系のY値が10以下である、請求項1に記載の黒色化表面処理銅箔。
- 前記RΔqが3~10である、請求項1又は2に記載の黒色化表面処理銅箔。
- 前記処理表面は、JIS Z 8729(2004)及びJIS Z 8722(2009)に準拠して測定されるL*a*b*表色系のa*値が4以下である、請求項1~3のいずれか一項に記載の黒色化表面処理銅箔。
- 前記処理表面は、JIS B 0601(2001)に準拠して測定される粗さ曲線要素の平均高さRcが0.1~1.0μmである、請求項1~4のいずれか一項に記載の黒色化表面処理銅箔。
- 前記処理表面は、JIS B 0601(2001)に準拠して測定される算術平均粗さRaが0.10~0.35μmである、請求項1~5のいずれか一項に記載の黒色化表面処理銅箔。
- 前記銅粒子が、銅及び不可避不純物からなる、請求項1~6のいずれか一項に記載の黒色化表面処理銅箔。
- 前記黒色化表面処理銅箔を前記処理表面側で厚さ100μmのポリエチレンテレフタレート樹脂フィルムの片面に貼り合わせた後、エッチングにより前記銅箔を除去した場合に、残されたポリエチレンテレフタレート樹脂フィルムが60%以下のヘイズ値を有する、請求項1~7のいずれか一項に記載の黒色化表面処理銅箔。
- 0.1~18μmの厚さを有する、請求項1~8のいずれか一項に記載の黒色化表面処理銅箔。
- タッチパネルセンサー用の配線材料に用いられる、請求項1~9のいずれか一項に記載の黒色化表面処理銅箔。
- キャリア箔と、該キャリア箔上に設けられた剥離層と、該剥離層上に前記処理表面を外側にして設けられた請求項1~10のいずれか一項に記載の黒色化表面処理銅箔とを備えた、キャリア箔付銅箔。
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