WO2014132947A1 - キャリア付き極薄銅箔、銅張積層板並びにコアレス基板 - Google Patents
キャリア付き極薄銅箔、銅張積層板並びにコアレス基板 Download PDFInfo
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- WO2014132947A1 WO2014132947A1 PCT/JP2014/054457 JP2014054457W WO2014132947A1 WO 2014132947 A1 WO2014132947 A1 WO 2014132947A1 JP 2014054457 W JP2014054457 W JP 2014054457W WO 2014132947 A1 WO2014132947 A1 WO 2014132947A1
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- carrier
- copper foil
- foil
- metal
- ultrathin 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
- 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
- C25D1/00—Electroforming
- C25D1/20—Separation of the formed objects from the electrodes with no destruction of said electrodes
- C25D1/22—Separating compounds
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/09—Use of materials for the conductive, e.g. metallic pattern
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/03—Conductive materials
- H05K2201/0332—Structure of the conductor
- H05K2201/0335—Layered conductors or foils
- H05K2201/0355—Metal foils
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/46—Manufacturing multilayer circuits
- H05K3/4644—Manufacturing multilayer circuits by building the multilayer layer by layer, i.e. build-up multilayer circuits
- H05K3/4652—Adding a circuit layer by laminating a metal foil or a preformed metal foil pattern
Definitions
- the present invention relates to an ultrathin copper foil with a carrier suitable for manufacturing a coreless substrate, and a copper-clad laminate composed of the ultrathin copper foil of the ultrathin copper foil with a carrier.
- circuit board manufacturers are studying the production of multilayer laminates that use thinner substrates, called coreless substrates, and build-ups used in semiconductor packages, etc. There is a movement to replace a part of the substrate with a coreless substrate.
- the coreless substrate does not have a core that supports the wiring layer, the coreless substrate has poor rigidity, and there is a concern that defects such as bending, warping, and cracking may occur during the formation of the wiring layer. Therefore, using the carrier foil of the ultrathin copper foil with carrier as a support, the build-up circuit board is laminated on the ultrathin copper foil side, finally peeling off the carrier foil of the ultrathin copper foil with carrier, A new manufacturing method to be taken out is being studied.
- the build-up board has a high-density wiring in which fine wiring layers (build-up layers) are stacked above and below the core layer as a support.
- fine wiring layers build-up layers
- a conventional printed circuit board technology using a glass epoxy resin or the like is employed for the core layer, which causes the electrical characteristics to deteriorate.
- the large inductance component of the plated through hole penetrating the core layer is a factor that increases the power supply noise of the semiconductor chip. Therefore, the movement to adopt the coreless substrate without the core layer is rapidly progressing.
- a specific manufacturing process of a coreless substrate using an ultrathin copper foil with a carrier as a support will be described.
- the coreless substrate is manufactured through steps in order from (a) to (g) in FIG.
- a prepreg 4 is laminated on the ultrathin copper foil 2 of the ultrathin copper foil 3 with a carrier.
- An ultrathin copper foil 7 with a carrier for forming fine wiring is laminated on the prepreg 4.
- the carrier foil 5 of an ultrathin copper foil with a carrier for forming fine wiring is peeled off, and the ultrathin copper foil 6 is etched into a predetermined wiring pattern to form fine wiring 8.
- the prepreg 4 is again laminated on the fine wiring 8, and the first layer of the coreless substrate is completed.
- the coreless substrate 9 is formed on the ultrathin copper foil with a carrier serving as a support. Thereafter, the carrier foil 1 serving as a support is peeled off, the outermost ultrathin copper foil 2 is finally removed by etching or the like, and only the coreless substrate as shown in (g) is taken out.
- an ultrathin copper foil with a carrier is used for forming fine wiring formed in the inner layer.
- the carrier foil 5 is peeled off after the step (b) in FIG. 1, the carrier foil 1 used as a support is in the process of manufacturing the coreless substrate unless the carrier peel strength of the ultrathin copper foil 3 with a carrier is high. There is concern about peeling at an unintended stage. On the other hand, if the carrier peel strength is too high, a strong force is required when the coreless substrate is peeled off after the lamination process, and there is a concern that the coreless substrate may be bent or warped.
- the peel strength at which the carrier foil 1 of the ultrathin copper foil 3 with a carrier is peeled from the ultrathin copper foil 2 requires appropriate adhesion in a manufacturing process such as plating or etching, but ultimately mechanically. Since it is necessary to peel off the coreless substrate without damaging it, it is desirable that it be 0.05 kN / m to 0.15 kN / m.
- Patent Document 1 Regarding the peeling layer of the ultra-thin copper foil with carrier, for example, there are inventions described in Patent Documents 1 and 2, but neither is an invention intended to produce a coreless substrate.
- the present inventors have recognized that unexpected problems can occur when applied.
- Patent Document 1 (WO2010 / 27052) considering the temperature applied when manufacturing a multilayer laminate, even if it is placed in an environment at a high temperature of 300 ° C. to 400 ° C.
- the main purpose is to peel off easily by defining two layers of peeling interfaces and defining the metal ratio of the peeling layer composed of two layers.
- Patent Document 2 Japanese Patent Application Laid-Open No. 2007-186781 defines the contents of the two types of metals A and B constituting the release layer, which are necessary for suppressing the occurrence of blistering with low peel strength. is doing.
- an ultrathin copper foil with a carrier having a high carrier peel strength is required in order to prevent the carrier foil and the copper foil from being peeled off at an unintended stage in the laminating process of the laminate.
- a relatively low temperature mainly 150 ° C. to 220 ° C. required for pressing a glass epoxy resin substrate or a bismaleimide triazine resin substrate
- an appropriate high carrier peel strength is obtained.
- An object of this invention is to provide the ultra-thin copper foil with a carrier which satisfies such a request
- the ultra-thin copper foil with a carrier of the present invention is formed between a carrier foil, an ultra-thin copper foil, the carrier foil and the ultra-thin copper foil, and a metal A that retains peelability and the ultra-thin copper foil.
- the release layer includes a first release layer formed on the carrier foil side and a second release layer formed on the ultrathin copper foil side, and the first release layer moderately increases carrier peel strength.
- the element ratio x1 of the metal A and the element ratio y1 of the metal B are set to 70 (%) ⁇ y1 / (x1 + y1) ⁇ ⁇ 100 ⁇ 79 (% )
- the element ratio x2 of metal A and the element ratio y2 of metal B are 80 (%) ⁇ y2 / (x2 + y2) ⁇ ⁇ 100 ⁇ 88 (%) for the same reason. It is characterized by.
- the ultrathin copper foil with carrier of the present invention has a peel strength of 0.05 kN / m between the carrier foil and the ultrathin copper foil after heat treatment at a temperature of 150 ° C. or higher and 220 ° C. or lower for 1 to 2 hours. It is preferable that it is 0.15 kN / m or less.
- the ultra-thin copper foil with a carrier according to the present invention is at least one metal or alloy in which the metal A is selected from the group of alloys containing Mo, Ta, V, Mn, W, Cr, and these elements. Is preferably at least one metal or alloy selected from the group of Fe, Co, Ni, and alloys containing these elements.
- the ultra-thin copper foil with a carrier of the present invention preferably has a diffusion prevention layer between the carrier foil and the release layer.
- the diffusion prevention layer is preferably formed of at least one metal or alloy selected from the group of Fe, Ni, Co, Cr, and alloys containing these elements. .
- the carrier foil is preferably copper or a copper alloy.
- the copper-clad laminate of the present invention is a copper-clad laminate obtained by laminating the above-mentioned ultrathin copper foil with a carrier on a resin base material.
- the ultra-thin copper foil with a carrier of the present invention prevents peeling of the carrier foil and the copper foil at an unintended stage during the laminating process of the multilayer laminate produced using the ultra-thin copper foil with the carrier, and the production process Stabilization and improvement in yield can be achieved.
- FIG. 1 is a schematic view of a manufacturing process of a coreless substrate using an ultrathin copper foil with a carrier as a support.
- FIG. 2 is a schematic view showing an embodiment of an ultrathin copper foil with a carrier of the present application.
- FIG. 3 is a diagram showing current density conditions during plating when producing an ultrathin copper foil with a carrier of the present application.
- FIG. 2 shows an embodiment of an ultrathin copper foil with a carrier of the present application.
- the ultrathin copper foil with a carrier 10 is a carrier foil 11, a diffusion prevention layer 12 formed on the surface of the carrier foil 11, and a diffusion prevention layer 12.
- the release layer 13 is formed on the surface of the release layer 13 and the ultrathin copper foil 16 is formed on the surface of the release layer 13.
- the release layer 13 includes a first release layer 14 formed on the carrier foil side and a second release layer 15 formed on the ultrathin copper foil side. When the ultrathin copper foil is peeled off from the carrier foil, the first release layer 14 remains on the carrier foil side, and the second release layer 15 remains on the ultrathin copper foil side.
- the release layer is expected to have the same high carrier peel strength as that of the present application even when only the first release layer 14 is formed, the first release layer 14 is easily dissolved in the plating solution at the time of copper strike plating in the next step. Therefore, in order to prevent this, it is necessary to form the second release layer 15 so that the first release layer 14 does not directly contact the copper strike plating solution.
- the carrier foil 11 for the ultrathin copper foil 10 with a carrier aluminum foil, aluminum alloy foil, stainless steel foil, titanium foil, titanium alloy foil, copper foil, copper alloy foil, etc. can be generally used. From the viewpoint of simplicity, electrolytic copper foil, electrolytic copper alloy foil, rolled copper foil or rolled copper alloy foil is preferable.
- the thickness of the carrier foil 11 is preferably 7 ⁇ m to 200 ⁇ m.
- the release layer 13 is composed of a metal A that retains peelability and a metal B that facilitates plating of an ultrathin copper foil.
- the metal A constituting the release layer is selected from the group of Mo, Ta, V, Mn, W, Cr, or an alloy containing these elements. Among these, it is particularly preferable to select from the group of Mo, Ta, V, Mn, W or an alloy containing these elements from the viewpoint of the safety of the chemical solution used for the treatment to the living body.
- the metal B is selected from the group of Fe, Co, Ni, or an alloy containing these elements.
- the release layer 13 includes a first release layer 14 provided on the carrier foil 11 side and a second release layer 15 provided on the ultrathin copper foil 16 side.
- the composition ratio (element ratio) of the metal A that maintains the releasability of the first release layer 14 that constitutes the release layer 13 and the metal B that facilitates the plating of the ultrathin copper foil is the subject of earnest research by the inventors. result, 70 (%) ⁇ y1 / (x1 + y1) ⁇ ⁇ 100 ⁇ 79 (%) It was found that the ratio of X1 is the element ratio of metal A, and y1 is the element ratio of metal B.
- the ratio is 70% or less, the carrier peel becomes too low, and the carrier foil and the copper foil may be peeled off at an unintended stage during the lamination process of the laminate, and the ratio is 79. If it exceeds 50%, the carrier peel becomes too high, causing a problem that the ultrathin copper foil cannot be peeled off.
- the composition ratio (element ratio) of the metal A that keeps the peelability of the second release layer 15 constituting the release layer 13 and the metal B that facilitates the plating of the ultrathin copper foil the inventors' diligent research Result in 80 (%) ⁇ y2 / (x2 + y2) ⁇ ⁇ 100 ⁇ 88 (%) It was found that the ratio of X2 is the element ratio of metal A, and y2 is the element ratio of metal B.
- the ratio is 80% or less, the content ratio of the metal B for facilitating the plating of the ultrathin copper foil is small, and pinholes are generated in the ultrathin copper foil to be formed or blisters are generated.
- the carrier peel strength becomes too high, which causes a problem that the ultrathin copper foil cannot be peeled off from the carrier foil.
- the sum of the element ratios of the metals of the same genus is used as the element ratio.
- a diffusion prevention layer may be formed on the surface of the carrier foil 11 in order to stabilize the peelability of the ultrathin copper foil 16. By providing the diffusion preventing layer 12 in this way, the peelability of the release layer 13 is stabilized and effective.
- Ni is used as the diffusion preventing layer, but the same effect can be obtained with Fe and Co.
- a diffusion prevention layer 12 for preventing diffusion of the elements of the carrier foil is first formed on the surface of the carrier foil 11, and then the first release layer 14 and the first release layer 14 are formed.
- Two release layers 15 are formed.
- Each of the release layers 14 and 15 can be formed by electrolytic plating.
- the metal composition of each peeling layer 14 and 15 it becomes possible by changing the concentration ratio (electrolytic bath composition) of the metal A and the metal B added to the electrolytic bath.
- the metal composition can be changed by changing the plating conditions without changing the electrolytic bath composition.
- the metal composition of each release layer can be changed by changing the current density.
- the ultrathin copper foil 16 is formed on the second release layer 15 by electrolytic plating using a copper sulfate bath, a copper pyrophosphate bath, a copper sulfamate bath, a copper cyanide bath, or the like. To do.
- the immersion time in the plating solution, the current density, the time of draining after plating, the time of washing with water, and the plating Depending on the pH of the solution, the second release layer may be damaged, so the plating bath composition, plating conditions, etc. must be carefully selected in relation to the elements constituting the second release layer.
- the thickness of the copper plating deposited by strike plating is preferably 0.01 ⁇ m to 0.5 ⁇ m, and the conditions vary depending on the type of bath.
- the current density is 0.1 A / dm 2 to 20 A / dm 2
- the plating time is Is preferably 0.1 seconds or longer.
- the strike plating in which the metal concentration of the plating solution is reduced, causes burn plating.
- a uniform copper plating layer cannot be obtained, which is not preferable.
- the thickness of the copper plating formed on the release layer by strike plating needs to be a thickness that does not impair the peelability of the release layer, and is preferably 0.01 to 0.5 ⁇ m. After forming this strike plating layer, copper plating is performed to a desired thickness to obtain an ultrathin copper foil.
- the temperature applied in the pressing process is 150 ° C. to 220 ° C.
- the ultrathin copper foil with a carrier of this embodiment has an optimum carrier peel strength after passing through such a temperature region, and an etching process is performed to form a circuit on the ultrathin copper foil with a carrier in a coreless substrate manufacturing process. It has a high carrier peel strength that is strong enough to withstand the carrier peel strength against a load such as press treatment.
- the peeling phenomenon of the ultrathin copper foil with a carrier of the present invention occurs when a peeling interface is formed due to the presence of the metal A oxide.
- the metal oxide serving as the peeling interface does not precipitate unless coexisting with hydrogen gas.
- Hydrogen gas is generated by polarization (plating) at a base potential lower than the hydrogen overvoltage, and hydrogen gas is constantly generated when performed at a sufficiently low base potential. As a result, the amount of hydrogen gas generated is reduced as compared with the case where the operation is performed at a sufficiently low potential.
- the potential during plating can be controlled by changing the current density.
- the cathode current density is 0.4 A / dm 2 and the potential is ⁇ 1.12 V ( vs. Ag / AgCl / sat.KCl), and unsteady generation of hydrogen gas from the cathode starts. Thereafter, when the current density is increased, the slope of the polarization curve shows a constant value of ⁇ 1.18 V / decade up to 1.0 A / dm 2 ( ⁇ 1.22 V (vs. Ag / AgCl / sat. KCl)).
- Example 1 A copper foil (thickness: 18 ⁇ m) having a surface roughness Rz of 1.1 ⁇ m on one side was used as a carrier foil, and Ni plating treatment was performed on the carrier foil to form a diffusion prevention layer.
- Ni plating condition Ni 120g / L H 3 BO 3 30 g / L pH 3.5 Bath temperature 50 ° C Current density 20A / dm 2 Plating time 14.8s
- a first release layer was formed using a Co—Mo plating bath at a current density of 0.4 A / dm 2 and a plating time of 6.0 s.
- Co-Mo plating condition Mo 8.0g / L Co 4.0g / L Trisodium citrate 60g / L pH 5.2 Bath temperature 25 ° C
- the second release layer is immersed in a Co—Mo solution for 5.0 s, immersed in a plating solution, and at a current density of 0.3 A / dm 2 and a plating time of 12.0 s. Formation was performed.
- copper strike plating is performed on this release layer under copper pyrophosphate plating conditions, and then copper plating is performed under thin copper foil plating conditions to form an ultrathin copper foil having a thickness of 3 ⁇ m. A foil was used.
- Copper pyrophosphate plating conditions Copper pyrophosphate 19g / L Potassium pyrophosphate 250g / L pH 8.5 Bath temperature 40 °C Current density 1.2A / dm 2 Plating time 59.2s
- Ultra-thin copper foil condition Cu 70g / L H 2 SO 4 50 g / L Cl 25ppm Current density 16.3 A / dm 2 Plating time 59.2s
- Example 2 to 5 An ultrathin copper foil with a carrier was prepared in the same manner as in Example 1 except that the plating conditions for forming the first release layer and the plating conditions for forming the second release layer in Example 1 were changed as shown in Table 1.
- Example 6 A diffusion preventing layer similar to that of Example 1 was formed on the same carrier foil as that of Example 1.
- a first release layer was formed on a carrier foil on which a diffusion preventing layer was formed using a Mo—Fe plating bath.
- Mo-Fe plating condition Mo 8.0g / L Fe 3.7 g / L Trisodium citrate 60g / L pH 4.0 Bath temperature 35 ° C Current density 0.5A / dm 2 Plating time 6.0s
- the first release layer After forming the first release layer, it was immersed in a Mo—Fe solution for 5.0 s. After immersion in the plating solution, a second release layer was formed at a current density of 0.3 A / dm 2 and a plating time of 12.0 s. Next, copper strike plating and copper plating were performed on the release layer in the same manner as in Example 1 to form an ultrathin copper foil having a thickness of 3 ⁇ m to obtain an ultrathin copper foil with a carrier.
- Example 7 A diffusion preventing layer similar to that of Example 1 was formed on the same carrier foil as that of Example 1.
- a first release layer was formed on the carrier foil on which the diffusion preventing layer was formed using a Mo—Ni plating bath.
- Mo-Ni plating conditions Mo 24.0g / L Ni 11.2g / L Trisodium citrate 60g / L pH 10 Bath temperature 25 ° C Current density 0.8A / dm 2 Plating time 6.0s
- the first release layer After forming the first release layer, it was immersed in a Mo—Ni solution for 5.0 s. After immersion in the plating solution, a second release layer was formed at a current density of 0.3 A / dm 2 and a plating time of 12.0 s. Next, copper strike plating and copper plating were performed on the release layer in the same manner as in Example 1 to form an ultrathin copper foil having a thickness of 3 ⁇ m to obtain an ultrathin copper foil with a carrier.
- Example 8 A diffusion preventing layer similar to that of Example 1 was formed on the same carrier foil as that of Example 1.
- a first release layer was formed on a carrier foil on which a diffusion preventing layer was formed using a W—Ni plating bath.
- W-Ni plating conditions W 27.9g / L Ni 11.2g / L Trisodium citrate 60g / L pH 10 Bath temperature 25 ° C Current density 0.7A / dm 2 Plating time 6.0s
- the first release layer After the first release layer was formed, it was immersed in W—Ni solution for 5.0 s. After immersion in the plating solution, a second release layer was formed at a current density of 0.3 A / dm 2 and a plating time of 12.0 s. Next, copper strike plating and copper plating were performed on the release layer in the same manner as in Example 1 to form an ultrathin copper foil having a thickness of 3 ⁇ m to obtain an ultrathin copper foil with a carrier.
- Example 1 A diffusion preventing layer similar to that of Example 1 was formed on the same carrier foil as that of Example 1.
- the hydrogen generation amount is clearly less than or greater than that in Example 1, and the current density conditions in Table 1 (the potential becomes nobler than in the example).
- the first release layer was formed under the polarization condition and the polarization condition at a lower potential. After forming the first release layer, it was immersed in a Mo—Co solution for 5.0 s. After immersion in the plating solution, a second release layer was formed under the current density conditions shown in Table 1.
- copper strike plating and copper plating were performed on the release layer in the same manner as in Example 1 to form an ultrathin copper foil having a thickness of 3 ⁇ m to obtain an ultrathin copper foil with a carrier.
- Example 3 A diffusion preventing layer similar to that of Example 1 was formed on the same carrier foil as that of Example 1.
- a first release layer was formed under the current density conditions shown in Table 1 using a Mo—Co plating bath. After forming the first release layer, it was immersed in a Mo—Co solution for 5.0 s. After immersion in the plating solution, the second release layer was formed under the current density conditions shown in Table 1 (polarization conditions with a more noble potential than the examples and polarization conditions with a lower base potential).
- copper strike plating and copper plating were performed on the release layer in the same manner as in Example 1 to form an ultrathin copper foil having a thickness of 3 ⁇ m to obtain an ultrathin copper foil with a carrier.
- the produced ultrathin copper foil with a carrier was pressed under the conditions of a heat pressure of 150 ° C. ⁇ 1 hour, 180 ° C. ⁇ 1 hour, and 220 ° C. ⁇ 2 hours under a pressing pressure of 30 kgf / cm 2.
- the substrate was laminated.
- a circuit having a width of 10 mm was prepared, and the carrier peel strength was peeled off in the direction of 90 degrees using a tensile tester (manufactured by Toyo Baldwin, UTM-4-100) based on JIS C 6481-1996. It was measured. The measurement results are shown in Table 1.
- the ultrathin copper foil of the prepared sample is peeled off from the carrier foil, and the amount of attached elements (Mo, Co, Ni, W, Fe) remaining on the ultrathin copper foil side and the carrier foil side is measured with a fluorescent X-ray analyzer. It measured using. The measurement results are shown in Table 1.
- Example 1 to 8 when the carrier foil and the ultrathin copper foil are peeled off, the ratio of the metal B to the release layer component remaining on the carrier foil and the ultrathin copper foil is 70% to 79%, respectively. And 80% to 89%.
- Carrier peel strength after heating at 150 ° C x 1 hour, 180 ° C x 1 hour and 220 ° C x 2 hours is 0.050 kN / m to 0.150 kN / m, suitable for coreless substrate manufacturing Strength was obtained.
- Comparative Example 1 In Comparative Example 1, when the carrier foil and the ultrathin copper foil were peeled off, the ratio of the metal B to the release layer component remaining on the carrier foil and the ultrathin copper foil was 79.6% and 85.85%, respectively. The ratio of metal B on the carrier foil side exceeds 9%. For this reason, the carrier peel strength after heating at 150 ° C. ⁇ 1 hour, 180 ° C. ⁇ 1 hour, and 220 ° C. ⁇ 2 hours is higher than 0.150 kN / m, and high carrier peel strength is realized. When the carrier foil is peeled off, the coreless substrate may be damaged such as bending or bending when it is peeled off, which causes a problem in practical use.
- Comparative Example 2 In Comparative Example 2, when the carrier foil and the ultrathin copper foil were peeled off, the ratio of the metal B in the peeling layer component remaining in the carrier foil was 70% or less, which was a value below the specification of the present application. Yes. Therefore, the carrier peel strength after heating at 150 ° C. ⁇ 1 hour, 180 ° C. ⁇ 1 hour, and 220 ° C. ⁇ 2 hours was less than 0.050 kN / m, and a high carrier peel was not realized.
- Comparative Example 3 In Comparative Example 3, when the carrier foil and the ultrathin copper foil were peeled off, the ratio of the metal B in the release layer component remaining on the ultrathin copper foil was 88% or more, and the ultrathin copper foil side The ratio of metal B is equal to or greater than the provisions of the present application. For this reason, the carrier peel strength after heating at 150 ° C. ⁇ 1 hour, 180 ° C. ⁇ 1 hour, and 220 ° C. ⁇ 2 hours is higher than 0.150 kN / m, and high carrier peel strength is realized. When the carrier foil is peeled off, the coreless substrate may be damaged such as bending or bending when it is peeled off, which causes a problem in practical use.
- Comparative Example 4 In Comparative Example 4, when the carrier foil and the ultrathin copper foil were peeled off, the ratio of the metal B in the peeling layer component remaining on the ultrathin copper foil was 80% or less, and the ultrathin copper foil side The ratio of metal B is not more than the provisions of the present application. Therefore, the carrier peel strength after heating at 150 ° C. ⁇ 1 hour, 180 ° C. ⁇ 1 hour, and 220 ° C. ⁇ 2 hours was less than 0.050 kN / m, and a high carrier peel was not realized.
- SYMBOLS 1 Carrier foil of ultrathin copper foil with carrier for support 2 Ultrathin copper foil of ultrathin copper foil with carrier for support 3 Ultrathin copper foil with carrier for support 4 Prepreg 5 Ultrathin copper with carrier for fine wiring formation Foil carrier foil 6 Ultrathin copper foil with carrier for fine wiring formation 7 Ultrathin copper foil with carrier for fine wiring formation 8 Fine wiring 9 Coreless substrate 10 Ultrathin copper foil with carrier 11 Carrier foil 12 Diffusion prevention Layer 13 Release layer 14 First release layer 15 Second release layer 16 Ultrathin copper foil
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Abstract
Description
例えば、特許文献1(WO2010/27052号公報)には、多層積層板を製造する際に負荷される温度を考慮し、300℃~400℃の高温下での環境に置かれてもキャリア箔と極薄銅箔とを容易に剥がすことを目的として、剥離界面を2層とし、2層からなる剥離層の金属比を規定して容易に剥がすことを主眼としている。
特に、コアレス基板作製時に印加される比較的低温(主として、ガラスエポキシ樹脂基板やビスマレイミドトリアジン樹脂基板のプレスに必要な150℃~220℃)での加熱後において、適度の高キャリアピール強度となるキャリア付き極薄銅箔が求められている。
本発明は、このような要求を満足するキャリア付き極薄銅箔を提供し、該キャリア付き極薄銅箔を用いた積層板を提供することを目的とする。
前記剥離層は、前記キャリア箔側に形成された第一剥離層と、前記極薄銅箔側に形成された第二剥離層とからなり、前記第一剥離層はキャリアピール強度を適度に高める目的で剥離界面となる金属Aまたはその化合物の割合を少なくするため、金属Aの元素比x1と金属Bの元素比y1を
70(%)<{y1/(x1+y1)}×100≦79(%)
とし、かつ前記第二剥離層も同様の理由で金属Aの元素比x2と金属Bの元素比y2を
80(%)<{y2/(x2+y2)}×100≦88(%)
とすることを特徴とする。
前記剥離層を構成する金属AとしてはMo、Ta、V、Mn、W、Cr又はこれらの元素を含む合金の群から選択する。この中でも、処理に使用する薬液の生体への安全性の観点からは、Mo、Ta、V、Mn、W又はこれらの元素を含む合金の群から選択することが特に好ましい。また、金属BはFe、Co、Ni又はこれらの元素を含む合金の群から選択する。
剥離層13を構成する第一剥離層14の、剥離性を保持する金属Aと、極薄銅箔のめっきを容易にする金属Bの組成比(元素比)は、発明者らの鋭意研究の結果、
70(%)<{y1/(x1+y1)}×100≦79(%)
の比率とすることが最適であることが見出された。なお、x1は金属Aの元素比、y1は金属Bの元素比である。
80(%)<{y2/(x2+y2)}×100≦88(%)
の比率とすることが最適であることが見出された。なお、x2は金属Aの元素比、y2は金属Bの元素比である。
極薄銅箔16の剥離性を安定させるために、キャリア箔11の表面に拡散防止層を形成してもよい。このように拡散防止層12を設けることで剥離層13の剥離性が安定し効果的である。本願実施例ではNiを拡散防止層として用いているが、Fe及びCoでも同様の効果が得られる。
キャリア付き極薄銅箔10の作製の一例としては、キャリア箔11の表面に先ずキャリア箔の元素の拡散を防止する拡散防止層12を形成し、次いで第一剥離層14及び第二剥離層15を形成する。
上記各剥離層14、15は電解めっきで形成することができる。
各剥離層14、15の金属組成を変化させるには、電解浴に添加する金属Aと金属Bとの濃度比率(電解浴組成)を変えることで可能となる。
或いは電解浴組成を変えなくとも、めっき条件を変えることにより金属組成を変えることもできる。例えば、電流密度を変化させることで各剥離層の金属組成を変えることができる。
極薄銅箔16の形成は、硫酸銅浴、ピロリン酸銅浴、スルファミン酸銅浴、シアン化銅浴などを使用し、第二剥離層15上に電解めっきで形成する。なお、第二剥離層15を構成する元素によっては、極薄銅箔を製膜する電解めっき工程において、めっき液中への浸漬時間、電流密度、めっき後の液切り時、水洗時、及びめっき液のpHによっては第二剥離層にダメージが与えられことがあるため、めっき浴組成、めっき条件等については第二剥離層を構成する元素との関係で注意して選択する必要がある。
このように均一なめっきが困難な時には、先ず第二剥離層15の表面にピロリン酸銅浴などでストライク銅めっきを行うことにより、金属Aの酸化物を還元しつつ密着性が良好で緻密な下地めっきを形成し、その上に通常の銅めっきを施すことで第二剥離層上に均一なめっきを施すことができ、極薄銅箔に生じるピンホールの数を低減させ、フクレの発生を防止することができる。
本実施形態のキャリア付き極薄銅箔はこのような温度領域を経た後でキャリアピール強度が最適となり、かつ、コアレス基板製造工程でキャリア付き極薄銅箔に回路を形成するエッチング処理、積層するプレス処理等の負荷に対してキャリアピール強度が充分に耐えられる強さを有する高いキャリアピール強度を有する。
また単にめっき時間を短くすることでも金属Aの析出量は減少するので、電流密度と時間を調整して金属Aの酸化物の析出量を制御することが必要である。特許文献1及び2のめっき条件を再調査したところ、本願の実施形態よりも水素ガスが定常的に発生する条件で、かつ長い時間めっきを行っており、剥離層中の金属Aの割合が本願の請求範囲よりも高いことが判明した。それに対し本願の実施形態では、金属Aの酸化物の析出量が少なく、相対的に金属Bの析出割合が高くなる新規のめっき条件とすることにより、密着性の弱い剥離面を形成されにくくして、目的とする高い剥離強度を実現している。
[実施例]
片面の表面粗さRzが1.1μmの銅箔(厚さ:18μm)をキャリア箔とし、キャリア箔上にNiめっき処理を行い、拡散防止層を形成した。
Niめっき条件
Ni 120g/L
H3BO3 30g/L
pH 3.5
浴温 50℃
電流密度 20A/dm2
めっき時間 14.8s
Co-Moめっき条件
Mo 8.0g/L
Co 4.0g/L
クエン酸三ナトリウム 60g/L
pH 5.2
浴温 25℃
次いで、この剥離層上にピロリン酸銅めっき条件で銅ストライクめっきを行い、その上に薄銅箔めっき条件により銅めっきを行い、3μm厚さの極薄銅箔を形成してキャリア付き極薄銅箔とした。
ピロリン酸銅 19g/L
ピロリン酸カリウム 250g/L
pH 8.5
浴温 40℃
電流密度 1.2A/dm2
めっき時間 59.2s
極薄銅箔製箔条件
Cu 70g/L
H2SO4 50g/L
Cl 25ppm
電流密度 16.3A/dm2
めっき時間 59.2s
実施例1の第一剥離層形成のめっき条件、第二剥離層形成のめっき条件を表1に示す通りに変更した以外は実施例1と同様にしてキャリア付き極薄銅箔を作製した。
実施例1と同様のキャリア箔に、実施例1と同様の拡散防止層を形成した。拡散防止層を形成したキャリア箔上に、Mo-Feめっき浴を用いて第一剥離層形成を行った。
Mo-Feめっき条件
Mo 8.0g/L
Fe 3.7g/L
クエン酸三ナトリウム 60g/L
pH 4.0
浴温 35℃
電流密度 0.5A/dm2
めっき時間 6.0s
実施例1と同様のキャリア箔に、実施例1と同様の拡散防止層を形成した。拡散防止層を形成したキャリア箔上に、Mo-Niめっき浴を用い第一剥離層形成を行った。
Mo-Niめっき条件
Mo 24.0g/L
Ni 11.2g/L
クエン酸三ナトリウム 60g/L
pH 10
浴温 25℃
電流密度 0.8A/dm2
めっき時間 6.0s
実施例1と同様のキャリア箔に、実施例1と同様の拡散防止層を形成した。拡散防止層を形成したキャリア箔上に、W-Niめっき浴を用い第一剥離層形成を行った。
W-Niめっき条件
W 27.9g/L
Ni 11.2g/L
クエン酸三ナトリウム 60g/L
pH 10
浴温 25℃
電流密度 0.7A/dm2
めっき時間 6.0s
[比較例1及び2]
実施例1と同様のキャリア箔に、実施例1と同様の拡散防止層を形成した。拡散防止層を形成したキャリア箔上に、Mo-Coめっき浴を用いて水素発生量が実施例1より明らかに少なくなる、または多くなる表1の電流密度条件(実施例より貴な電位となる分極条件及びより卑な電位となる分極条件)で第一剥離層形成を行った。
第一剥離層形成を行った後、Mo-Co液中に5.0s浸漬した。めっき液への浸漬後、表1の電流密度条件で第二剥離層形成を行った。次いで、この剥離層上に実施例1と同様に銅ストライクめっきと銅めっきを行い、3μm厚さの極薄銅箔を形成してキャリア付き極薄銅箔とした。
実施例1と同様のキャリア箔に、実施例1と同様の拡散防止層を形成した。拡散防止層を形成したキャリア箔上に、Mo-Coめっき浴を用いて表1の電流密度条件で第一剥離層形成を行った。
第一剥離層形成を行った後、Mo-Co液中に5.0s浸漬した。めっき液への浸漬後、表1の電流密度条件(実施例より貴な電位となる分極条件及びより卑な電位となる分極条件)で第二剥離層形成を行った。次いで、この剥離層上に実施例1と同様に銅ストライクめっきと銅めっきを行い、3μm厚さの極薄銅箔を形成してキャリア付き極薄銅箔とした。
[実施例1~8]
実施例1~8は、キャリア箔と極薄銅箔を引き剥がした際に、キャリア箔及び極薄銅箔上に残存する剥離層成分のうち、金属Bが占める割合がそれぞれ70%~79%及び80%~89%となった。150℃×1時間、180℃×1時間及び220℃×2時間の加熱後のキャリアピール強度が0.050kN/m~0.150kN/mとなっており、コアレス基板製造に適しているキャリアピール強度が得られた。
比較例1は、キャリア箔と極薄銅箔を引き剥がした際に、キャリア箔及び極薄銅箔上に残存する剥離層成分のうち、金属Bが占める割合がそれぞれ79.6%及び85.9%となり、キャリア箔側における金属Bの割合が本願の規定を超えている。このため150℃×1時間、180℃×1時間及び220℃×2時間加熱後のキャリアピール強度が0.150kN/mより高く、高キャリアピール強度化が実現されているが、キャリアピール強度が高すぎて、キャリア箔を引き剥がす際にコアレス基板に曲げや折れ等のダメージを与えるおそれがあり、実用上に問題がある。
比較例2は、キャリア箔と極薄銅箔を引き剥がした際に、キャリア箔に残存する剥離層成分のうち、金属Bが占める割合が70%以下となり、本願の規定以下の値となっている。このため150℃×1時間、180℃×1時間及び220℃×2時間加熱後のキャリアピール強度が0.050kN/m未満となり、高キャリアピール化が実現されなかった。
比較例3は、キャリア箔と極薄銅箔を引き剥がした際に、極薄銅箔上に残存する剥離層成分のうち、金属Bが占める割合が88%以上となり、極薄銅箔側における金属Bの割合が本願の規定以上となっている。このため150℃×1時間、180℃×1時間及び220℃×2時間加熱後のキャリアピール強度が0.150kN/mより高く、高キャリアピール強度化が実現されているが、キャリアピール強度が高すぎて、キャリア箔を引き剥がす際にコアレス基板に曲げや折れ等のダメージを与えるおそれがあり、実用上に問題がある。
比較例4は、キャリア箔と極薄銅箔を引き剥がした際に、極薄銅箔上に残存する剥離層成分のうち、金属Bが占める割合が80%以下となり、極薄銅箔側における金属Bの割合が本願の規定以下となっている。このため150℃×1時間、180℃×1時間及び220℃×2時間加熱後のキャリアピール強度が0.050kN/m未満となり、高キャリアピール化が実現されなかった。
2 支持体用キャリア付き極薄銅箔の極薄銅箔
3 支持体用キャリア付き極薄銅箔
4 プリプレグ
5 微細配線形成用キャリア付き極薄銅箔のキャリア箔
6 微細配線形成用キャリア付き極薄銅箔の極薄銅箔
7 微細配線形成用キャリア付き極薄銅箔
8 微細配線
9 コアレス基板
10 キャリア付き極薄銅箔
11 キャリア箔
12 拡散防止層
13 剥離層
14 第一剥離層
15 第二剥離層
16 極薄銅箔
Claims (8)
- キャリア箔と極薄銅箔と、前記キャリア箔と前記極薄銅箔との間に形成され、剥離性を保持する金属Aと前記極薄銅箔のめっきを容易にする金属Bからなる剥離層とを有するキャリア付き極薄銅箔であって、前記キャリア箔側に形成された第一剥離層と、前記極薄銅箔側に形成された第二剥離層とからなり、前記第一剥離層における金属Aの元素比x1と金属Bの元素比y1とが
70(%)<{y1/(x1+y1)}×100≦79(%)
であり、かつ前記第二剥離層における金属Aの元素比x2と金属Bの元素比y2とが
80(%)<{y2/(x2+y2)}×100≦88(%)
であるキャリア付き極薄銅箔。 - 150℃以上220℃以下の温度で1~2時間の加熱処理後における前記キャリア箔と前記極薄銅箔との常温における剥離強度が、0.05kN/m以上0.15kN/m以下である請求項1に記載のキャリア付き極薄銅箔。
- 前記金属Aは、Mo、Ta、V、Mn、W、Cr、これらの元素を含む合金の群から選択された少なくとも1つの金属又は合金であり、
金属Bは、Fe、Co、Ni、これらの元素を含む合金の群から選択された少なくとも1つの金属又は合金である請求項1又は2に記載のキャリア付き極薄銅箔。 - 前記キャリア箔と前記剥離層の間に拡散防止層を有する請求項1~3のいずれかに記載のキャリア付き極薄銅箔。
- 前記拡散防止層がFe、Ni、Co、Cr、これらの元素を含む合金の群から選択された少なくとも1つの金属又は合金で形成されている請求項4に記載のキャリア付き極薄銅箔。
- 前記キャリア箔が銅又は銅合金である請求項1~5のいずれかに記載のキャリア付き極薄銅箔。
- 請求項1~6のいずれかに記載のキャリア付き極薄銅箔を樹脂基材に積層してなる銅張積層板。
- 請求項1~7のいずれかに記載のキャリア付き極薄銅箔を使用して作製されたコアレス基板。
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- 2014-02-25 KR KR1020157019788A patent/KR101664993B1/ko active Active
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| JP2018009237A (ja) * | 2016-07-15 | 2018-01-18 | Jx金属株式会社 | キャリア付銅箔、キャリア付銅箔の製造方法、積層体、積層体の製造方法、プリント配線板の製造方法及び電子機器の製造方法 |
| WO2018181516A1 (ja) * | 2017-03-29 | 2018-10-04 | 日立化成株式会社 | コアレス基板用プリプレグ、コアレス基板、コアレス基板の製造方法及び半導体パッケージ |
| KR20190129118A (ko) * | 2017-03-29 | 2019-11-19 | 히타치가세이가부시끼가이샤 | 코어리스 기판용 프리프레그, 코어리스 기판, 코어리스 기판의 제조 방법 및 반도체 패키지 |
| JPWO2018181516A1 (ja) * | 2017-03-29 | 2020-02-06 | 日立化成株式会社 | コアレス基板用プリプレグ、コアレス基板、コアレス基板の製造方法及び半導体パッケージ |
| US10681807B2 (en) | 2017-03-29 | 2020-06-09 | Hitachi Chemical Company, Ltd. | Coreless substrate prepreg, coreless substrate, coreless substrate manufacturing method and semiconductor package |
| JP7103350B2 (ja) | 2017-03-29 | 2022-07-20 | 昭和電工マテリアルズ株式会社 | コアレス基板用プリプレグ、コアレス基板、コアレス基板の製造方法及び半導体パッケージ |
| KR102463619B1 (ko) | 2017-03-29 | 2022-11-03 | 쇼와덴코머티리얼즈가부시끼가이샤 | 코어리스 기판용 프리프레그, 코어리스 기판, 코어리스 기판의 제조 방법 및 반도체 패키지 |
| JP2025048697A (ja) * | 2023-09-20 | 2025-04-03 | 南亞塑膠工業股▲分▼有限公司 | 剥離キャリア構造及び銅箔複合構造 |
| US12492482B2 (en) | 2023-09-20 | 2025-12-09 | Nan Ya Plastics Corporation | Release carrier structure and copper foil composite structure |
Also Published As
| Publication number | Publication date |
|---|---|
| JP5755371B2 (ja) | 2015-07-29 |
| JPWO2014132947A1 (ja) | 2017-02-02 |
| CN105074058A (zh) | 2015-11-18 |
| TW201437436A (zh) | 2014-10-01 |
| CN105074058B (zh) | 2016-11-23 |
| KR101664993B1 (ko) | 2016-10-11 |
| KR20150122632A (ko) | 2015-11-02 |
| TWI593830B (zh) | 2017-08-01 |
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