WO2023074361A1 - 両面銅張積層板、キャパシタ素子及びキャパシタ内蔵プリント配線板、並びに両面銅張積層板の製造方法 - Google Patents
両面銅張積層板、キャパシタ素子及びキャパシタ内蔵プリント配線板、並びに両面銅張積層板の製造方法 Download PDFInfo
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- WO2023074361A1 WO2023074361A1 PCT/JP2022/037980 JP2022037980W WO2023074361A1 WO 2023074361 A1 WO2023074361 A1 WO 2023074361A1 JP 2022037980 W JP2022037980 W JP 2022037980W WO 2023074361 A1 WO2023074361 A1 WO 2023074361A1
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- clad laminate
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/09—Use of materials for the conductive, e.g. metallic pattern
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/018—Dielectrics
- H01G4/06—Solid dielectrics
- H01G4/14—Organic dielectrics
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/35—Feed-through capacitors or anti-noise capacitors
-
- 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
- H05K1/03—Use of materials for the substrate
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/03—Use of materials for the substrate
- H05K1/0313—Organic insulating material
- H05K1/0353—Organic insulating material consisting of two or more materials, e.g. two or more polymers, polymer + filler, + reinforcement
- H05K1/0373—Organic insulating material consisting of two or more materials, e.g. two or more polymers, polymer + filler, + reinforcement containing additives, e.g. fillers
-
- 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
- H05K1/16—Printed circuits incorporating printed electric components, e.g. printed resistor, capacitor, inductor
-
- 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
- H05K1/16—Printed circuits incorporating printed electric components, e.g. printed resistor, capacitor, inductor
- H05K1/162—Printed circuits incorporating printed electric components, e.g. printed resistor, capacitor, inductor incorporating printed capacitors
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/02—Apparatus or processes for manufacturing printed circuits in which the conductive material is applied to the surface of the insulating support and is thereafter removed from such areas of the surface which are not intended for current conducting or shielding
- H05K3/022—Processes for manufacturing precursors of printed circuits, i.e. copper-clad substrates
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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
- H05K3/46—Manufacturing multilayer circuits
-
- 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
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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
- H05K3/46—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
- H05K3/4655—Adding a circuit layer by laminating a metal foil or a preformed metal foil pattern by using a laminate characterized by the insulating layer
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/005—Electrodes
- H01G4/008—Selection of materials
Definitions
- the present invention relates to a double-sided copper-clad laminate, a capacitor element, a capacitor-embedded printed wiring board, and a method for manufacturing a double-sided copper-clad laminate.
- Printed wiring boards are widely used in electronic communication devices such as portable electronic devices.
- portable electronic communication equipment and the like become lighter, thinner, shorter, and more functional in recent years, noise reduction and the like in printed wiring boards have become a problem.
- Capacitors are important for enabling noise reduction, and in order to achieve high performance, capacitors are desired to be small and thin enough to be incorporated in the inner layers of printed wiring boards.
- a double-sided copper-clad laminate is used to form such a capacitor.
- a double-sided copper-clad laminate generally has a structure in which a dielectric layer is sandwiched between copper foils on both sides, and the dielectric layer is made thinner in order to increase the capacitance of the capacitor.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2004-249480 discloses a double-sided copper-clad laminate in which electrolytic copper foil is laminated on both sides of a thin dielectric layer having a thickness of 3 ⁇ m or more and 10 ⁇ m or less. It is described to prevent a short circuit due to proximity of copper foil processing surfaces due to thinning.
- Patent Document 1 a structure in which a commercially available reinforcing material (heat-resistant film) is provided between a pair of thermosetting resins (that is, a three-layer structure of resin layer / heat-resistant film layer / resin layer) is used as a dielectric layer.
- a double-sided copper clad laminate having However, since even thin films available on the market have a thickness of about 4 ⁇ m, it is difficult to achieve further thinning of the dielectric layer with the technique disclosed in Patent Document 1. Moreover, even if the dielectric layer can be further thinned, there is a concern that the handleability of the double-sided copper-clad laminate will be deteriorated accordingly.
- the present inventors have recently developed a double-sided copper-clad laminate with an extremely thin dielectric layer of 0.1 ⁇ m or more and 2.0 ⁇ m or less, and further adding a resin layer between the dielectric layer and the copper foil.
- the present inventors have found that by providing the capacitor, not only good capacitor characteristics but also excellent handleability can be achieved.
- an object of the present invention is to provide a double-sided copper-clad laminate capable of realizing not only good capacitor properties but also excellent handleability.
- Aspect 2 The double-sided copper-clad laminate according to aspect 1, wherein the tensile strength of the resin layer is higher than the tensile strength of the dielectric layer.
- Aspect 6 When the dielectric layer contains the dielectric filler, the content of the dielectric filler in the dielectric layer is 10 parts by weight or more and 90 parts by weight or less with respect to 100 parts by weight of the dielectric layer.
- Aspect 7 When the resin layer contains the dielectric filler, the content of the dielectric filler in the resin layer is 10 parts by weight or more and 80 parts by weight or less with respect to 100 parts by weight of the resin layer.
- Aspect 8 Aspect 5, wherein the content of the dielectric filler in the resin layer with respect to 100 parts by weight of the resin layer is less than the content of the dielectric filler in the dielectric layer with respect to 100 parts by weight of the dielectric layer.
- 8. The double-sided copper clad laminate according to any one of 1 to 7.
- Aspect 9 9. The double-sided copper-clad laminate according to any one of aspects 5, 6 and 8, wherein the resin layer does not contain a dielectric filler and the dielectric layer contains a dielectric filler.
- Aspect 10 The double-sided copper-clad laminate according to aspect 9, wherein the content of the dielectric filler in the dielectric layer is 10 parts by weight or more and 90 parts by weight or less with respect to 100 parts by weight of the dielectric layer.
- Aspect 11 The double-sided copper-clad laminate according to any one of modes 1 to 10, wherein the resin contained in the resin layer has a glass transition temperature Tg of 180° C. or higher.
- Aspect 12 The double-sided copper-clad laminate according to any one of modes 1 to 11, wherein the glass transition temperature Tg of the resin contained in the resin layer is higher than the glass transition temperature Tg of the resin contained in the dielectric layer.
- a capacitor element comprising the double-sided copper-clad laminate according to any one of aspects 1-12.
- a capacitor-embedded printed wiring board comprising the double-sided copper-clad laminate according to any one of aspects 1 to 12.
- a method for producing a double-sided copper clad laminate according to any one of aspects 1 to 12, (i) coating a copper foil with a resin layer precursor; (ii) curing the precursor to obtain a copper foil with a resin layer; (iii) disposing a dielectric layer on the surface of said resin layer; (iv) the resin layer-coated copper foil having the dielectric layer disposed thereon and another resin layer-coated copper foil prepared through the steps (i) and (ii) above; A step of pressing so as to be sandwiched;
- a method of manufacturing a double-sided copper-clad laminate comprising:
- FIG. 1 shows a schematic cross-sectional view of a double-sided copper-clad laminate according to the present invention
- FIG. 1 shows a schematic cross-sectional view of a double-sided copper-clad laminate 10 according to the present invention.
- double-sided copper-clad laminate 10 is obtained by laminating copper foil 14 on both sides of dielectric layer 12 .
- the thickness of the dielectric layer 12 is 0.1 ⁇ m or more and 2.0 ⁇ m or less.
- the double-sided copper-clad laminate 10 further includes a pair of resin layers 16 arranged in contact with the copper foil 14 between the dielectric layer 12 and the copper foil 14 .
- the thickness of the dielectric layer 12 is extremely thin, from 0.1 ⁇ m to 2.0 ⁇ m, and the resin layer 16 is provided between the dielectric layer 12 and the copper foil 14.
- Patent Document 1 discloses a configuration in which a commercially available reinforcing material (heat-resistant film) is provided between a pair of thermosetting resins (that is, a three-layer configuration of resin layer/heat-resistant film layer/resin layer). as the dielectric layer.
- a commercially available reinforcing material heat-resistant film
- thermosetting resins that is, a three-layer configuration of resin layer/heat-resistant film layer/resin layer.
- the double-sided copper-clad laminate of the present invention conveniently solves this problem.
- the thickness of the dielectric layer 12 is 0.1 ⁇ m or more and 2.0 ⁇ m or less, more preferably 0.3 ⁇ m or more and 1.8 ⁇ m or less, and still more preferably 0.5 ⁇ m or more and 1.5 ⁇ m or less.
- the dielectric layer 12 is preferably composed of a resin composition containing a resin component and optionally a dielectric filler.
- This resin component is composed of a thermoplastic component and/or a thermosetting component.
- epoxy resin polyethylene terephthalate resin, polyethylene naphthalate resin, polyvinylcarbazole resin, polyphenylene sulfide resin, polyamide resin, aromatic polyamide resin, polyamideimide resin, polyimide resin, polyethersulfone resin, polyethernitrile resin.
- the dielectric layer 12 preferably contains a dielectric filler which is a composite metal oxide containing at least two selected from the group consisting of Ba, Ti, Sr, Pb, Zr, La, Ta, Ca and Bi.
- This composite metal oxide more preferably contains at least two selected from the group consisting of Ba, Ti and Sr.
- the composite metal oxide contains at least one selected from the group consisting of BaTiO 3 , BaTi 4 O 9 , SrTiO 3 , Pb(Zr,Ti)O 3 , PbLaTiO 3 , PbLaZrO, and SrBi 2 Ta 2 O 9 and more preferably at least one selected from the group consisting of BaTiO 3 and SrTiO 3 .
- Pb(Zr, Ti)O 3 means Pb(Zr x Ti 1-x )O 3 (where 0 ⁇ x ⁇ 1, typically 0 ⁇ x ⁇ 1). By doing so, it is possible to more effectively obtain a double-sided copper-clad laminate that provides good capacitor characteristics even when thinned.
- the weight of the dielectric layer 12 is 100 parts by weight (100 parts by weight of the solid content of the resin composition contained in the dielectric layer, which includes not only the resin component but also the weight of the dielectric filler).
- the content of the dielectric filler in the dielectric layer 12 is preferably 10 to 90 parts by weight, more preferably 15 to 85 parts by weight, still more preferably 25 to 80 parts by weight. Part by weight or less.
- the particle diameter of the dielectric filler which is a composite metal oxide, is not particularly limited, but from the viewpoint of uniformly dispersing the filler in the resin component, the average particle diameter D50 measured by laser diffraction scattering particle size distribution measurement should be 0.5. 001 ⁇ m or more and 2.0 ⁇ m or less, more preferably 0.01 ⁇ m or more and 1.8 ⁇ m or less, and still more preferably 0.03 ⁇ m or more and 1.6 ⁇ m or less.
- the dielectric layer 12 may further contain a filler dispersant.
- a filler dispersant By further including a filler dispersant, the dispersibility of the dielectric filler can be improved when the resin varnish and the dielectric filler are kneaded.
- Any known filler dispersant that can be used can be used as appropriate, and is not particularly limited.
- Preferred examples of filler dispersants include ionic dispersants such as phosphonic acid type, cationic type, carboxylic acid type and anionic dispersants, and nonionic dispersants such as ether type, ester type and sorbitan ester type dispersants. , diester type, monoglyceride type, ethylene oxide addition type, ethylenediamine base type, phenol type dispersant, and the like.
- Other examples include coupling agents such as silane coupling agents, titanate coupling agents and aluminate coupling agents.
- a curing accelerator may be added to the resin composition used for the dielectric layer 12 in order to accelerate the curing of the resin component.
- Preferred examples of curing accelerators include imidazole-based curing accelerators and amine-based curing accelerators.
- the content of the curing accelerator is 0.01 parts by weight or more with respect to 100 parts by weight of non-volatile components in the resin composition, from the viewpoint of the storage stability of the resin component contained in the resin composition and the efficiency of curing. 0 weight part or less is preferable, and 0.1 weight part or more and 2.0 weight parts or less are more preferable.
- the pair of resin layers 16 are arranged between the dielectric layer 12 and the copper foil 14 so as to be in contact with the copper foil 14 , thereby contributing to improving the handling properties of the double-sided copper-clad laminate 10 . Therefore, even if the double-sided copper-clad laminate 10 is subjected to double-sided etching to remove the copper foil and expose the three-layer structure of resin layer 16/dielectric layer 12/resin layer 16, it exhibits excellent strength and is resistant to cracking. Become.
- the thickness of each resin layer 16 is preferably 0.1 ⁇ m or more and 4.0 ⁇ m or less, more preferably 0.5 ⁇ m or more and 3.5 ⁇ m or less, and still more preferably 1.5 ⁇ m or more and 2.5 ⁇ m or less. Therefore, the total thickness of the dielectric layer 12 and the resin layer 16 (that is, the three-layer structure of resin layer 16/dielectric layer 12/resin layer 16) is preferably 0.3 ⁇ m or more and 10 ⁇ m or less, more preferably 1.3 ⁇ m or more. It is 8.8 ⁇ m or less, more preferably 3.5 ⁇ m or more and 6.5 ⁇ m or less.
- the resin layer 16 is preferably composed of a resin composition containing a resin component and optionally a dielectric filler.
- This resin component includes epoxy resin, polyethylene terephthalate, polyethylene naphthalate, polyvinylcarbazole, polyphenylene sulfide, polyimide, polyamide, aromatic polyamide (for example, wholly aromatic polyamide), polyamideimide, polyethersulfone, polyethernitrile, polyether.
- It preferably contains at least one selected from the group consisting of ether ketone and polytetrafluoroethylene, more preferably selected from the group consisting of polyphenylene sulfide, polyimide, polyamide, polyamideimide, and wholly aromatic polyamide (aramid) and more preferably at least one selected from the group consisting of polyimide, polyamide, and wholly aromatic polyamide (aramid).
- the resin layer becomes tough, and even if the resin layer is thinned or a dielectric filler is introduced, the handling property can be effectively secured.
- the resin layers constituting the double-sided copper-clad laminate are a pair of resin layers that come into contact with the copper foil, and one resin layer and the other resin layer may be composed of different components.
- the resin layer 16 may contain dielectric filler.
- dielectric filler the same kind and particle size as the dielectric filler contained in the dielectric layer 12 can be used. By doing so, it is possible to more effectively obtain the double-sided copper-clad laminate 10 that provides good capacitor characteristics even when thinned.
- the weight of the resin layer 16 is 100 parts by weight (the solid content of the resin composition contained in the resin layer is 100 parts by weight, which includes not only the resin component but also the weight of the dielectric filler).
- the content of the dielectric filler in the resin layer 16 is preferably 10 parts by weight or more and 80 parts by weight or less, more preferably 15 parts by weight or more and 70 parts by weight or less, still more preferably 20 parts by weight or more and 65 parts by weight or more. Part by weight or less.
- the resin layer 16 may further contain a filler dispersant.
- the filler dispersant the same type of filler dispersant as that contained in the dielectric layer can be used.
- the resin layer 16 does not contain a dielectric filler if it is desired to specialize in ensuring a higher handleability. That is, it is preferable that the resin layer 16 does not contain a dielectric filler and the dielectric layer 12 contains a dielectric filler.
- the content of the dielectric filler in the dielectric layer 12 is preferably 10 parts by weight or more and 90 parts by weight or less with respect to 100 parts by weight of the dielectric layer 12 .
- the dielectric layer 12 and the resin layer 16 may contain dielectric fillers. That is, the double-sided copper-clad laminate 10 preferably contains a dielectric filler in at least one or both of the resin layer 16 and the dielectric layer 12 . Also, the content of the dielectric filler in the resin layer with respect to 100 parts by weight of the resin layer is preferably smaller than the content of the dielectric filler in the dielectric layer with respect to 100 parts by weight of the dielectric layer. By doing so, it is possible to achieve both insulation properties and handling properties while maintaining good capacitor characteristics.
- the glass transition temperature Tg of the resin contained in the resin layer 16 is preferably 180°C or higher, more preferably 200°C or higher and 350°C or lower, and still more preferably 220°C or higher and 330°C or lower. Also, the glass transition temperature Tg of the resin contained in the resin layer 16 is preferably higher than the glass transition temperature Tg of the resin contained in the dielectric layer 12 . By controlling the Tg to such a range, the handleability can be ensured even at high temperatures, so that the yield in the manufacturing process can be further improved.
- the tensile strength of the resin layer 16 is preferably greater than the tensile strength of the dielectric layer 12. This tensile strength is preferably measured at 25° C. according to JIS K7161 by preparing samples of the same thickness of the resin layer 16 and the dielectric layer 12 . By making the tensile strength of the resin layer 16 greater than the tensile strength of the dielectric layer 12, good handling properties can be effectively realized. Also, the overall tensile strength of the dielectric layer 12 and the resin layer 16 is preferably 50 MPa or more and 200 MPa or less, more preferably 80 MPa or more and 150 MPa or less.
- the tensile strength of the dielectric layer 12 alone is preferably 20 MPa or more and 80 MPa or less, more preferably 40 MPa or more and 80 MPa or less.
- the tensile strength of the resin layer 16 alone is preferably 80 MPa or more and 250 MPa or less, more preferably 100 MPa or more and 250 MPa or less. From the viewpoint of more accurate measurement, it is preferable to evaluate the tensile strength of the resin layer 16 and the dielectric layer 12 by preparing samples having the same thickness.
- the piercing strength of the resin film (entire dielectric layer 12 and resin layer 16) in the double-sided copper-clad laminate 10 is preferably 0.6N or more, more preferably 1.2N or more, still more preferably 1.5N. 2.4 N or more, particularly preferably 2.4 N or more.
- the piercing strength is within the above range, in the manufacturing process of the capacitor built-in printed wiring board, when forming the capacitor circuit by etching, even if the resin in the part where the circuit does not exist is exposed, the etchant and the water washing shower It can withstand the water pressure when performing such as. Therefore, it is possible to ensure practically good handleability.
- the upper limit of the puncture strength is not particularly limited, it is typically 5.0 N or less from the viewpoint of resin material design. Evaluation of puncture strength can be performed in accordance with JIS Z1707:2019 "General Rules for Plastic Films for Food Packaging".
- the maximum peak height Sp of the surface of the copper foil 14 that contacts the resin layer 16 is preferably 0.05 ⁇ m or more and 3.3 ⁇ m or less, and more preferably 0.06 ⁇ m or more. 0.1 ⁇ m or less, more preferably 0.06 ⁇ m or more and 3.0 ⁇ m or less, and particularly preferably 0.07 ⁇ m or more and 2.9 ⁇ m or less. From the viewpoint of obtaining a particularly thin double-sided copper-clad laminate, the maximum peak height Sp is more preferably 2.5 ⁇ m or less, even more preferably 1.7 ⁇ m or less, even more preferably 1.1 ⁇ m or less. is most preferred.
- the “maximum peak height Sp” is a three-dimensional parameter representing the maximum height from the average plane of the surface, measured according to ISO25178.
- the root-mean-square gradient Sdq of the surface of the copper foil 14 in contact with the resin layer 16, measured according to ISO 25178, is preferably 0.01 or more and 2.3 or less, more preferably 0.02 or more. It is 2.2 or less, more preferably 0.03 or more and 2.0 or less, and particularly preferably 0.04 or more and 1.8 or less. From the viewpoint of obtaining a particularly thin double-sided copper-clad laminate, the root-mean-square gradient Sdq is more preferably 1.6 or less, even more preferably 1.3 or less, and 0.4 or less. is most preferred.
- the “root-mean-square gradient Sdq” is a parameter calculated from the root-mean-square gradient at all points in the defined region, which is measured according to ISO25178. That is, since it is a three-dimensional parameter that evaluates the magnitude of the local tilt angle, it is possible to quantify the steepness of the unevenness of the surface. For example, the Sdq of a completely flat surface is 0, and the Sdq increases if the surface has an inclination. The Sdq of a plane with a tilt component of 45 degrees is 1.
- the kurtosis Sku of the surface on the side in contact with the resin layer, measured according to ISO 25178, is preferably 2.6 or more and 4.0 or less, more preferably 2.7 or more and 3.0. 8 or less, more preferably 2.7 or more and 3.7 or less.
- the thickness of the copper foil 14 is not particularly limited, it is preferably 0.1 ⁇ m or more and 200 ⁇ m or less, more preferably 0.5 ⁇ m or more and 105 ⁇ m or less, and still more preferably 1.0 ⁇ m or more and 70 ⁇ m or less.
- a construction method such as a subtractive method, a SAP (semi-additive) method, an MSAP (modified semi-additive) method, which is a general pattern forming method for forming wiring on a printed wiring board.
- the double-sided copper clad laminate 10 shown in FIG. Not limited to configuration. That is, the double-sided copper-clad laminate of the present invention may have other layers (for example, between the dielectric layer 12 and the resin layer 16).
- Capacitor element and capacitor-embedded printed wiring board The double-sided copper-clad laminate of the present invention is preferably incorporated into a capacitor element. That is, according to a preferred aspect of the present invention, there is provided a capacitor element including the double-sided copper-clad laminate described above.
- the configuration of the capacitor element is not particularly limited, and a known configuration can be adopted.
- a particularly preferred form is a capacitor-embedded printed wiring board in which the capacitor is incorporated as an inner layer portion of the printed wiring board. That is, according to a particularly preferred aspect of the present invention, there is provided a capacitor-embedded printed wiring board comprising the double-sided copper-clad laminate described above. Capacitor elements and capacitor-embedded printed wiring boards can be manufactured based on known methods.
- a preferred method for producing the double-sided copper-clad laminate of the present invention includes (i) a step of coating a copper foil with a precursor for a resin layer, and (ii) curing the precursor to form a resin. (iii) disposing a dielectric layer on the surface of the resin layer; (iv) the resin layer-coated copper foil having the dielectric layer disposed thereon; and the above steps (i) and (ii). and a step of pressing another copper foil with a resin layer produced through the above step so that the dielectric layer is sandwiched between the resin layers from both sides.
- a precursor of the resin layer is prepared.
- This precursor becomes a resin layer after curing.
- the use of the above precursor can effectively thin the resin layer after curing.
- polyamic acid, polyamidoimide, or a precursor thereof can be used as a raw material component for resin varnish as a precursor.
- a coating liquid is obtained by kneading this resin varnish raw material component and, if desired, a slurry containing a dielectric filler or the like.
- This coating liquid is applied to a copper foil so that the thickness of the resin layer after drying becomes a predetermined value.
- Any coating method may be used, but in addition to the gravure coating method, a die coating method, a knife coating method, or the like may be employed. In addition, it is also possible to apply using a doctor blade, a bar coater, or the like.
- Step of Curing the Precursor to Obtain a Copper Foil with a Resin Layer The copper foil coated with the precursor is cured.
- the curing method is not particularly limited. For example, after drying the precursor in a heated oven to make it a semi-cured state, it can be further heated at a high temperature in a conveyor furnace or oven. Thus, a copper foil with a resin layer can be obtained.
- the precursor is applied in the above step (i) and this step and thermally cured, thereby thinning the resin layer and increasing the dielectric density of the resin layer by introducing a dielectric filler. can be effectively realized.
- such a resin layer is tough, and can effectively secure handleability even if it is thinned or a dielectric filler is introduced.
- raw material components for resin varnish to be used for the dielectric layer are prepared.
- the raw material component for the resin varnish can be the resin component used for the dielectric layer described above.
- a coating liquid is obtained by kneading this resin varnish raw material component and, if desired, a slurry containing a dielectric filler or the like. This coating solution is applied to the resin layer of the resin layer-coated copper foil so that the thickness of the dielectric layer after drying has a predetermined value.
- Any coating method may be used, but in addition to the gravure coating method, a die coating method, a knife coating method, or the like may be employed. In addition, it is also possible to apply using a doctor blade, a bar coater, or the like. You may heat after coating as needed.
- Step of pressing A copper foil with a resin layer on which a dielectric layer is arranged, and another resin layer produced by the above steps (i) and (ii) or the above steps (i), (ii) and (iii)
- the attached copper foil is pressed so that the dielectric layer is sandwiched between the resin layers from both sides.
- heating may be performed or the atmosphere may be evacuated. In this way, a double-sided copper-clad laminate can be preferably produced.
- step (ii) and the above step (iii) it is preferable to perform a step of roughening the surface of the resin layer of the copper foil with the resin layer.
- surface roughening treatment methods include plasma treatment, corona discharge treatment, sandblast treatment, and the like. By performing such a surface roughening treatment, it is possible to increase the area of the contact interface between the resin layer and the dielectric layer, improve adhesion (peel strength), and avoid delamination. Plasma treatment and corona discharge treatment are more preferable surface roughening treatments for the resin layer.
- Examples 1-6 (1) Preparation of Dielectric Layer Coating Liquid (1a) Preparation of Dielectric Layer Resin Varnish First, as raw material components for resin varnish, the following resin component and imidazole curing accelerator were prepared. - Biphenyl-aralkyl type epoxy resin: Nippon Kayaku Co., Ltd., NC-3000 - Polyfunctional phenolic resin (curing agent): Meiwa Kasei Co., Ltd., MEH-7500 - Phenolic hydroxyl group-containing polybutadiene-modified aromatic polyamide resin: Nippon Kayaku Co., Ltd., BPAM-155 -Imidazole-based epoxy resin curing accelerator: 2P4MHZ manufactured by Shikoku Kasei Kogyo Co., Ltd.
- the raw material components for the resin varnish were weighed at the compounding ratios (weight ratios) shown in Tables 1A and 1B. After that, the cyclopentanone solvent was weighed, and the resin varnish raw material component and the cyclopentanone solvent were put into a flask and stirred at 60°C. After confirming that the resin varnish had no undissolved raw materials and that the resin varnish was transparent, the resin varnish was recovered.
- the cyclopentanone solvent, dielectric filler and dispersant were weighed.
- the weighed solvent, dielectric filler and dispersant were slurried in a disperser.
- the resin varnish was weighed so that the final dielectric filler had the compounding ratio (weight ratio) shown in Tables 1A and 1B, and kneaded with the dielectric filler-containing slurry in a disperser. . It was confirmed that the dielectric filler was not agglomerated after kneading. Thus, a dielectric layer coating liquid was obtained.
- the NMP (N-methyl-2-pyrrolidone) solvent, dielectric filler and dispersant were weighed respectively.
- the weighed solvent, dielectric filler and dispersant were slurried in a disperser.
- the resin varnish was weighed so that the final dielectric filler had the compounding ratio (weight ratio) shown in Tables 1A and 1B, and kneaded with the dielectric filler-containing slurry in a disperser. . It was confirmed that the dielectric filler was not agglomerated after kneading. Thus, a resin layer coating liquid was obtained.
- the dielectric layer coating liquid obtained in (1) above is applied to the resin layer side of the copper foil with a resin layer obtained in (6) above, and the thickness of the dielectric layer after drying.
- the resin was applied using a bar coater to the thickness shown in Tables 1A and 1B, and then dried in an oven heated to 150°C for 3 minutes to make the resin semi-cured.
- a copper foil with a resin layer having a dielectric layer was obtained.
- Tg glass transition temperature
- the Tg of the resin layer and the dielectric layer were measured. Specifically, (i) a copper foil was coated with a resin layer coating liquid, and then the coating liquid was cured to obtain a resin layer-coated copper foil. All the copper of this copper foil with a resin layer was removed by etching to prepare a 12 ⁇ m-thick resin film (resin layer only), and Tg was measured. In addition, (ii) after the dielectric layer coating liquid was applied to the copper foil, the coating liquid was cured to obtain two copper foils with a dielectric layer. A double-sided copper-clad laminate was obtained by pressing and laminating the dielectric layers of the two copper foils with dielectric layers facing each other. All the copper on both sides of this double-sided copper-clad laminate was removed by etching to prepare a 12 ⁇ m-thick resin film (dielectric layer only), and Tg was measured.
- Capacitance (Cp) and dielectric loss tangent (Df)> A circular circuit with a diameter of 0.5 inches (12.6 mm) was produced by etching one side of the double-sided copper-clad laminate, and the frequency was 1 MHz with an LCR meter (manufactured by Hioki Electric Co., Ltd., LCR Hitester 3532-50). Cp (nF/in 2 ) and Df were measured. This measurement was performed according to IPC-TM-650 2.5.2. The results were as shown in Table 2.
- Dielectric breakdown voltage (BDV)> After etching one side of the double-sided copper clad laminate to create a circular circuit with a diameter of 0.5 inches (12.6 mm), the voltage was boosted with an insulation resistance measuring device (manufactured by Hioki Electric Co., Ltd., super megohmmeter SM7110). A dielectric breakdown voltage (kV) was measured under conditions of a speed of 167 V/sec. This measurement was performed according to IPC-TM-650 2.5.6.2a. The results were as shown in Table 2.
- Example 7 Double-sided copper-clad laminates were produced in the same manner as in Examples 4 to 6, except that no resin layer was formed. That is, a copper foil was coated with the dielectric layer coating liquid, and another copper foil was laminated on the coated foil to obtain a double-sided copper-clad laminate. Thus, a double-sided copper-clad laminate having a three-layer structure of copper foil/dielectric layer/copper foil containing no resin layer was obtained.
- the double-sided copper-clad laminate obtained in this example had problems such as brittleness of the resin film (dielectric layer), and the various evaluations described above could not be performed.
- Example 8 (Comparison) An attempt was made to produce a double-sided copper-clad laminate in the same manner as in Examples 3 and 6, except that no dielectric layer was formed. That is, an attempt was made to obtain a double-sided copper-clad laminate having a three-layer structure of copper foil/resin layer/copper foil that does not contain a dielectric layer. However, the resin layer-coated copper foils could not be laminated together, and a double-sided copper-clad laminate could not be obtained. Therefore, the various evaluations described above could not be performed.
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Abstract
Description
[態様1]
誘電層の両面に銅箔を張り合わせた両面銅張積層板であって、
前記誘電層の厚さが0.1μm以上2.0μm以下であり、
前記誘電層と前記銅箔との間に、前記銅箔と当接して配置される一対の樹脂層をさらに備えた、両面銅張積層板。
[態様2]
前記樹脂層の引張強度が前記誘電層の引張強度よりも大きい、態様1に記載の両面銅張積層板。
[態様3]
前記誘電層及び前記樹脂層の全体の引張強度が、50MPa以上200MPa以下である、態様1又は2に記載の両面銅張積層板。
[態様4]
前記誘電層及び前記樹脂層の全体の突刺し強さが0.6N以上である、態様1~3のいずれか一つに記載の両面銅張積層板。
[態様5]
前記樹脂層及び前記誘電層の少なくとも一方が誘電体フィラーを含む、態様1~4のいずれか一つに記載の両面銅張積層板。
[態様6]
前記誘電層が前記誘電体フィラーを含む場合、前記誘電層の重量100重量部に対して、前記誘電層中の前記誘電体フィラーの含有量が10重量部以上90重量部以下である、態様5に記載の両面銅張積層板。
[態様7]
前記樹脂層が前記誘電体フィラーを含む場合、前記樹脂層の重量100重量部に対して、前記樹脂層中の前記誘電体フィラーの含有量が10重量部以上80重量部以下である、態様5に記載の両面銅張積層板。
[態様8]
前記樹脂層の重量100重量部に対する前記樹脂層中の前記誘電体フィラーの含有量が、前記誘電層の重量100重量部に対する前記誘電層中の前記誘電体フィラーの含有量よりも少ない、態様5~7のいずれか一つに記載の両面銅張積層板。
[態様9]
前記樹脂層が誘電体フィラーを含まず、前記誘電層が誘電体フィラーを含む、態様5、6及び8のいずれか一つに記載の両面銅張積層板。
[態様10]
前記誘電層の重量100重量部に対して、前記誘電層中の前記誘電体フィラーの含有量が10重量部以上90重量部以下である、態様9に記載の両面銅張積層板。
[態様11]
前記樹脂層に含まれる樹脂のガラス転移温度Tgが180℃以上である、態様1~10のいずれか一つに記載の両面銅張積層板。
[態様12]
前記樹脂層に含まれる樹脂のガラス転移温度Tgが、前記誘電層に含まれる樹脂のガラス転移温度Tgよりも高い、態様1~11のいずれか一つに記載の両面銅張積層板。
[態様13]
態様1~12のいずれか一つに記載の両面銅張積層板を備えた、キャパシタ素子。
[態様14]
態様1~12のいずれか一つに記載の両面銅張積層板を備えた、キャパシタ内蔵プリント配線板。
[態様15]
態様1~12のいずれか一つに記載の両面銅張積層板の製造方法であって、
(i)銅箔に樹脂層の前駆体を塗工する工程と、
(ii)前記前駆体を硬化して樹脂層付き銅箔を得る工程と、
(iii)前記樹脂層の表面上に誘電層を配置する工程と、
(iv)前記誘電層を配置した前記樹脂層付き銅箔と、上記工程(i)及び(ii)を経て作製した別の樹脂層付き銅箔とを、前記誘電層が両側から前記樹脂層で挟み込まれるようにプレス加工する工程と、
を含む、両面銅張積層板の製造方法。
図1に、本発明による両面銅張積層板10の模式断面図を示す。図1に示されるように、両面銅張積層板10は、誘電層12の両面に銅箔14を張り合わせたものである。誘電層12の厚さは0.1μm以上2.0μm以下である。両面銅張積層板10は、誘電層12と銅箔14との間に、銅箔14と当接して配置される一対の樹脂層16をさらに備える。このように、両面銅張積層板10において、誘電層12の厚さを0.1μm以上2.0μm以下と極度に薄くし、かつ、誘電層12と銅箔14との間に樹脂層16をさらに設けることで、良好なキャパシタ特性のみならず優れたハンドリング性を実現することができる。
本発明の両面銅張積層板はキャパシタ素子に組み込まれるのが好ましい。すなわち、本発明の好ましい態様によれば、上述した両面銅張積層板を備えた、キャパシタ素子が提供される。キャパシタ素子の構成は特に限定されず、公知の構成が採用可能である。特に好ましい形態は、キャパシタがプリント配線板の内層部分として組み込まれた、キャパシタ内蔵プリント配線板である。すなわち、本発明の特に好ましい態様によれば、上述した両面銅張積層板を備えた、キャパシタ内蔵プリント配線板が提供される。キャパシタ素子やキャパシタ内蔵プリント配線板は、公知の手法に基づき製造することができる。
本発明の両面銅張積層板の好ましい製造方法は、(i)銅箔に樹脂層の前駆体を塗工する工程と、(ii)前駆体を硬化して樹脂層付き銅箔を得る工程と、(iii)樹脂層の表面上に誘電層を配置する工程と、(iv)誘電層を配置した樹脂層付き銅箔と、上記工程(i)及び(ii)を経て作製した別の樹脂層付き銅箔とを、誘電層が両側から樹脂層で挟み込まれるようにプレス加工する工程とを含む。
まず、樹脂層の前駆体を用意する。この前駆体は硬化後に樹脂層となるものである。前述のとおり、樹脂層に相当する層に用いる市販品の薄さには限界があり、樹脂層をさらに薄化することが望まれる。この点、上記前駆体を使用することにより、硬化後の樹脂層を効果的に薄化することができる。前駆体としての樹脂ワニス用原料成分には、例えば、ポリアミド酸や、ポリアミドイミドあるいはその前駆体等を用いることができる。この樹脂ワニス用原料成分と、所望により誘電体フィラー等を含むスラリーとを、混練することで、塗工液を得る。この塗工液を乾燥後の樹脂層の厚さが所定の値となるように銅箔に塗工する。塗工の方式については任意であるが、グラビアコート方式の他、ダイコート方式、ナイフコート方式等を採用することができる。その他、ドクターブレードやバーコーター等を使用して塗工することも可能である。
前駆体を塗工した銅箔を硬化する。硬化の方法は、特に限定されないが、例えば加熱したオーブンで乾燥させ前駆体を半硬化状態とした後に、コンベア炉又はオーブンにてさらに高温で加熱することができる。こうして、樹脂層付き銅箔を得ることができる。市販品を樹脂層に用いるのではなく、上記工程(i)及び本工程により前駆体を塗工し熱硬化させることで、樹脂層の薄化、及び誘電体フィラー導入による樹脂層の高誘電化を効果的に実現できる。さらに、そのような樹脂層は強靭であり、薄化したり誘電体フィラーを導入したりしてもハンドリング性を効果的に担保することができる。
まず、誘電層に用いられる樹脂ワニス用原料成分を用意する。この樹脂ワニス用原料成分は、上述した誘電層に用いられる樹脂成分を用いることができる。この樹脂ワニス用原料成分と、所望により誘電体フィラー等を含むスラリーとを、混練することで、塗工液を得る。この塗工液を乾燥後の誘電層の厚さが所定の値となるように樹脂層付き銅箔の樹脂層に塗工する。塗工の方式については任意であるが、グラビアコート方式の他、ダイコート方式、ナイフコート方式等を採用することができる。その他、ドクターブレードやバーコーター等を使用して塗工することも可能である。塗工後、必要に応じて加熱してもよい。
誘電層を配置した樹脂層付き銅箔と、上記工程(i)及び(ii)、又は上記工程(i)、(ii)及び(iii)により作製した別の樹脂層付き銅箔とを、誘電層が両側から樹脂層で挟み込まれるようにプレス加工する。このとき、必要に応じて、加熱したり雰囲気を真空にしたりしてもよい。こうして、両面銅張積層板を好ましく製造することができる。
(1)誘電層用塗工液の準備
(1a)誘電層用樹脂ワニスの調製
まず、樹脂ワニス用原料成分として、以下に示される樹脂成分及びイミダゾール系硬化促進剤を用意した。
‐ ビフェニル-アラルキル型エポキシ樹脂:日本化薬株式会社製、NC-3000
‐ 多官能フェノール樹脂(硬化剤):明和化成株式会社製、MEH-7500
‐ フェノール性水酸基含有ポリブタジエン変性芳香族ポリアミド樹脂:日本化薬株式会社製、BPAM-155
‐ イミダゾール系エポキシ樹脂硬化促進剤:四国化成工業株式会社製、2P4MHZ
続いて、以下に示される誘電体フィラー及び分散剤を用意した。
‐ チタン酸バリウム:日本化学工業株式会社製
‐ チタネート系カップリング剤:味の素ファインテクノ株式会社製、KR-44(誘電体フィラー100重量部に対して添加量1.5重量部)
(2a)樹脂層用樹脂ワニスの調製
樹脂層に用いられる樹脂ワニス用原料成分として、以下に示される樹脂成分を用意した。
‐ ポリアミド酸ワニス:宇部興産株式会社製
続いて、以下に示される誘電体フィラー及び分散剤を用意した。
‐ チタン酸バリウム:日本化学工業株式会社製
‐ チタネート系カップリング剤:味の素ファインテクノ株式会社製、KR-44(誘電体フィラー100重量部に対して添加量1.5重量部)
上記塗工液を塗工するための銅箔として、粗化処理銅箔を用意した。この銅箔の製造は、特許文献2や特許文献3等に開示されるような公知の方法により行った。
上記(2)で得られた樹脂層用塗工液を、上記(3)で用意した銅箔に乾燥後の樹脂層の厚さが表1A及び1Bに示される厚さとなるように、バーコーターを用いて塗工し、その後150℃に加熱したオーブンにて3分間乾燥させ、樹脂を半硬化状態とした。こうして樹脂層付き銅箔を得た。
上記(4)で得られた樹脂層付き銅箔に対して、小型コンベア炉(光洋サーモシステム株式会社製、810A-II)を用いてアニール処理を実施し、樹脂層を硬化状態にした樹脂層付き銅箔を得た。小型コンベア炉における最高設定温度は360℃とし、コンベア速度は40mm/分に設定した。
上記(5)で得られた樹脂層付き銅箔に対して、以下の条件でプラズマ処理を実施した。
‐ 使用装置:プラズマクリーナー(サムコ株式会社製、PC-1100)
‐ 処理ガス種:Ar
‐ ガス流量:40sccm
‐ 出力:500W
‐ 処理時間:30秒
上記(6)で得られた樹脂層付き銅箔の樹脂層側に、上記(1)で得られた誘電層用塗工液を乾燥後の誘電層の厚さが表1A及び1Bに示される厚さとなるようにバーコーターを用いて塗工し、その後150℃に加熱したオーブンにて3分間乾燥させ、樹脂を半硬化状態とした。こうして誘電層を備えた樹脂層付き銅箔を得た。
上記(7)で得られた誘電層を備えた樹脂層付き銅箔の誘電層側の面を上向きに載置し、その誘電層側の面に、上記(6)で得られた別の樹脂層付き銅箔を樹脂層側の面を下にして重ねた。このとき、180℃で120分間真空プレスを行い、誘電層を硬化状態とした。こうして、誘電層の両面に樹脂層及び銅箔をそれぞれ備えた、銅箔/樹脂層/誘電層/樹脂層/銅箔の5層構成の両面銅張積層板を得た。
両面銅張積層板の断面加工はミクロトームを用いて行い、断面観察(樹脂層及び誘電層の厚さの測定)は光学顕微鏡観察によって行った。なお、樹脂成分や誘電体フィラーの配合にも依るが、樹脂層や誘電層が数μm以下の厚さの領域になると、光学顕微鏡では各層の境界が見えにくいことがある。その場合は、必要に応じて公知の別の断面加工及び観察方法(例えばFIB加工及びSIM観察)を用いて確認することができる。
得られた両面銅張積層板について以下の各種評価を行った。
樹脂層及び誘電層のTgを測定した。具体的には、(i)樹脂層用塗工液を銅箔に塗工後、この塗工液を硬化して樹脂層付き銅箔を得た。この樹脂層付き銅箔の銅を全てエッチングにより除去して、厚さ12μmの樹脂フィルム(樹脂層のみ)を作製してTgを測定した。また、(ii)誘電層用塗工液を銅箔に塗工後、この塗工液を硬化して2枚の誘電層付き銅箔を得た。この2枚の誘電層付き銅箔の誘電層を向き合わせ、プレスして張り合わせることで、両面銅張積層板を得た。この両面銅張積層板の両面の銅を全てエッチングにより除去して、厚さ12μmの樹脂フィルム(誘電層のみ)を作製してTgを測定した。
両面銅張積層板の片面にエッチングを施して直径0.5インチ(12.6mm)の円形の回路を作製した後、LCRメーター(日置電機株式会社製、LCRハイテスタ3532-50)にて周波数1MHzにおけるCp(nF/in2)及びDfを測定した。この測定はIPC-TM-650 2.5.2に準拠して行った。結果は表2に示されるとおりであった。
両面銅張積層板の片面にエッチングを施して直径0.5インチ(12.6mm)の円形の回路を作製した後、絶縁抵抗測定器(日置電機株式会社製、超絶縁計SM7110)にて昇圧速度167V/sec条件下での絶縁破壊電圧(kV)を測定した。この測定はIPC-TM-650 2.5.6.2aに準拠して行った。結果は表2に示されるとおりであった。
両面銅張積層板の片面にエッチングを施して3mm幅の直線状の回路を作製した後、オートグラフにて引き剥がし速度50mm/分で回路を引き剥がし、その剥離強度(kgf/cm)を常温(例えば25℃)で測定した。この測定はIPC-TM-650 2.4.8に準拠して行った。結果は表2に示されるとおりであった。
両面銅張積層板の片面にエッチングを施して3mm幅の直線状の回路を作製した後、260℃に設定したオーブンで45分間ベーク処理を行った。ベーク処理後のサンプルはオートグラフにて引き剥がし速度50mm/分で回路を引き剥がし、その剥離強度(kgf/cm)を常温(例えば25℃)で測定した。この測定はIPC-TM-650 2.4.8に準拠して行った。結果は表2に示されるとおりであった。
両面銅張積層板の両面の銅を全てエッチングにより除去して、樹脂フィルム(樹脂層及び誘電層)を得た。この樹脂フィルムを幅10mm、長さ100mmに切り出し、オートグラフにて引張り速度50mm/分で引張り、その引張強度(MPa)及び伸び率(%)を常温(例えば25℃)で測定した。また、上記評価1にて作製した厚さ12μmの樹脂フィルム(樹脂層のみ)及び厚さ12μmの樹脂フィルム(誘電層のみ)を用いて同様の測定を実施することで、それぞれの引張強度を測定した。こうして、樹脂フィルム全体(樹脂層及び誘電層)だけでなく、樹脂層及び誘電層の引張強度も測定した。この測定はJIS K7161に準拠して行った。結果は表2に示されるとおりであった。
両面銅張積層板の両面の銅を全てエッチングにより除去して、樹脂フィルム(樹脂層及び誘電層)を得た。この樹脂フィルムを50mm×50mmに切り出し、固定治具にセットした。先端半径0.5mmの突刺し針をセットしたオートグラフにて試験速度50mm/分で突刺し、その突刺し強さ(N)を常温(例えば25℃)で測定した。この測定はJIS Z1707:2019「食品包装用プラスチックフィルム通則」に準拠して行った。結果は表2に示されるとおりであった。
樹脂層を形成しなかったこと以外は、例4~6と同様にして両面銅張積層板を作製した。すなわち、誘電層用塗工液を銅箔に塗工し、得られた塗工箔に別の銅箔を重ねて張り合わせて両面銅張積層板とした。こうして、樹脂層を含まない銅箔/誘電層/銅箔の3層構成の両面銅張積層板を得た。本例で得られた両面銅張積層板は樹脂フィルム(誘電層)がもろい等の問題があり、前述した各種評価を行うことができなかった。
誘電層を形成しなかったこと以外は、例3及び6と同様にして両面銅張積層板の作製を試みた。すなわち、誘電層を含まない銅箔/樹脂層/銅箔の3層構成の両面銅張積層板を得ようとした。しかし、樹脂層付き銅箔同士を張り合わせることができず、両面銅張積層板が得られなかった。したがって、前述した各種評価を行うことができなかった。
Claims (15)
- 誘電層の両面に銅箔を張り合わせた両面銅張積層板であって、
前記誘電層の厚さが0.1μm以上2.0μm以下であり、
前記誘電層と前記銅箔との間に、前記銅箔と当接して配置される一対の樹脂層をさらに備えた、両面銅張積層板。 - 前記樹脂層の引張強度が前記誘電層の引張強度よりも大きい、請求項1に記載の両面銅張積層板。
- 前記誘電層及び前記樹脂層の全体の引張強度が、50MPa以上200MPa以下である、請求項1又は2に記載の両面銅張積層板。
- 前記誘電層及び前記樹脂層の全体の突刺し強さが0.6N以上である、請求項1又は2に記載の両面銅張積層板。
- 前記樹脂層及び前記誘電層の少なくとも一方が誘電体フィラーを含む、請求項1又は2に記載の両面銅張積層板。
- 前記誘電層が前記誘電体フィラーを含む場合、前記誘電層の重量100重量部に対して、前記誘電層中の前記誘電体フィラーの含有量が10重量部以上90重量部以下である、請求項5に記載の両面銅張積層板。
- 前記樹脂層が前記誘電体フィラーを含む場合、前記樹脂層の重量100重量部に対して、前記樹脂層中の前記誘電体フィラーの含有量が10重量部以上80重量部以下である、請求項5に記載の両面銅張積層板。
- 前記樹脂層の重量100重量部に対する前記樹脂層中の前記誘電体フィラーの含有量が、前記誘電層の重量100重量部に対する前記誘電層中の前記誘電体フィラーの含有量よりも少ない、請求項5に記載の両面銅張積層板。
- 前記樹脂層が誘電体フィラーを含まず、前記誘電層が誘電体フィラーを含む、請求項5に記載の両面銅張積層板。
- 前記誘電層の重量100重量部に対して、前記誘電層中の前記誘電体フィラーの含有量が10重量部以上90重量部以下である、請求項9に記載の両面銅張積層板。
- 前記樹脂層に含まれる樹脂のガラス転移温度Tgが180℃以上である、請求項1又は2に記載の両面銅張積層板。
- 前記樹脂層に含まれる樹脂のガラス転移温度Tgが、前記誘電層に含まれる樹脂のガラス転移温度Tgよりも高い、請求項1又は2に記載の両面銅張積層板。
- 請求項1又は2に記載の両面銅張積層板を備えた、キャパシタ素子。
- 請求項1又は2に記載の両面銅張積層板を備えた、キャパシタ内蔵プリント配線板。
- 請求項1又は2に記載の両面銅張積層板の製造方法であって、
(i)銅箔に樹脂層の前駆体を塗工する工程と、
(ii)前記前駆体を硬化して樹脂層付き銅箔を得る工程と、
(iii)前記樹脂層の表面上に誘電層を配置する工程と、
(iv)前記誘電層を配置した前記樹脂層付き銅箔と、上記工程(i)及び(ii)を経て作製した別の樹脂層付き銅箔とを、前記誘電層が両側から前記樹脂層で挟み込まれるようにプレス加工する工程と、
を含む、両面銅張積層板の製造方法。
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| CN202280072191.5A CN118160417A (zh) | 2021-10-28 | 2022-10-12 | 双面覆铜层叠板、电容器元件和内置电容器的印刷电路板以及双面覆铜层叠板的制造方法 |
| JP2023556294A JPWO2023074361A1 (ja) | 2021-10-28 | 2022-10-12 | |
| US18/704,680 US20250046520A1 (en) | 2021-10-28 | 2022-10-12 | Double-sided copper clad laminate, capacitor element and printed wiring board with built-in capacitor, and method for manufacturing double-sided copper clad laminate |
| KR1020247012735A KR20240088905A (ko) | 2021-10-28 | 2022-10-12 | 양면 동장 적층판, 캐패시터 소자 및 캐패시터 내장 프린트 배선판, 그리고 양면 동장 적층판의 제조 방법 |
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| KR (1) | KR20240088905A (ja) |
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| JP2003039595A (ja) * | 2001-07-30 | 2003-02-13 | Mitsui Mining & Smelting Co Ltd | キャパシター層形成用の両面銅張積層板及びその製造方法 |
| JP2006165400A (ja) * | 2004-12-09 | 2006-06-22 | Mitsui Mining & Smelting Co Ltd | キャパシタ層形成材の製造方法及びその製造方法で得られたキャパシタ層形成材 |
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| WO2003096776A1 (en) | 2002-05-13 | 2003-11-20 | Mitsui Mining & Smelting Co.,Ltd. | Flexible printed wiring board for chip-on-film |
| JP4226927B2 (ja) | 2003-02-18 | 2009-02-18 | 三井金属鉱業株式会社 | キャパシタ層形成用の両面銅張積層板の製造方法 |
| TWI515342B (zh) | 2013-09-05 | 2016-01-01 | 三井金屬鑛業股份有限公司 | 表面處理銅箔、使用該表面處理銅箔所得之貼銅積層板以及印刷配線板 |
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| JP2003039595A (ja) * | 2001-07-30 | 2003-02-13 | Mitsui Mining & Smelting Co Ltd | キャパシター層形成用の両面銅張積層板及びその製造方法 |
| JP2006165400A (ja) * | 2004-12-09 | 2006-06-22 | Mitsui Mining & Smelting Co Ltd | キャパシタ層形成材の製造方法及びその製造方法で得られたキャパシタ層形成材 |
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| KR20240088905A (ko) | 2024-06-20 |
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| JPWO2023074361A1 (ja) | 2023-05-04 |
| CN118160417A (zh) | 2024-06-07 |
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