WO2022239687A1 - 積層体、回路基板及び回路基板の製造方法 - Google Patents
積層体、回路基板及び回路基板の製造方法 Download PDFInfo
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- WO2022239687A1 WO2022239687A1 PCT/JP2022/019428 JP2022019428W WO2022239687A1 WO 2022239687 A1 WO2022239687 A1 WO 2022239687A1 JP 2022019428 W JP2022019428 W JP 2022019428W WO 2022239687 A1 WO2022239687 A1 WO 2022239687A1
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- Prior art keywords
- metal layer
- metal
- insulating layer
- circuit board
- mass
- Prior art date
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Images
Classifications
-
- 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
- H05K1/0271—Arrangements for reducing stress or warp in rigid printed circuit boards, e.g. caused by loads, vibrations or differences in thermal expansion
-
- 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
- H05K1/05—Insulated conductive substrates, e.g. insulated metal substrate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- 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
- H05K1/0306—Inorganic insulating substrates, e.g. ceramic, glass
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/38—Improvement of the adhesion between the insulating substrate and the metal
- H05K3/382—Improvement of the adhesion between the insulating substrate and the metal by special treatment of the metal
- H05K3/383—Improvement of the adhesion between the insulating substrate and the metal by special treatment of the metal by microetching
-
- 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
- H05K3/44—Manufacturing insulated metal core circuits or other insulated electrically conductive core 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
- H05K3/0058—Laminating printed circuit boards onto other substrates, e.g. metallic substrates
- H05K3/0061—Laminating printed circuit boards onto other substrates, e.g. metallic substrates onto a metallic substrate, e.g. a heat sink
Definitions
- the present disclosure relates to a laminate, a circuit board, and a method of manufacturing a circuit board that are suitably used for manufacturing a circuit board (metal-based circuit board).
- Circuit boards have been put into practical use as circuit boards for forming hybrid integrated circuits by mounting electronic/electrical parts such as semiconductor elements.
- Circuit boards are classified into resin circuit boards, ceramic circuit boards, metal-based circuit boards, and the like, based on the substrate material.
- resin circuit boards are inexpensive, they are limited to applications that require relatively low power due to their low thermal conductivity.
- a ceramic circuit board is suitable for use with a relatively large amount of electric power because of its high electrical insulation and heat resistance, but has the disadvantage of being expensive.
- metal-based circuit boards have intermediate properties between the two, and are used for general-purpose applications that require relatively large amounts of power, such as inverters for refrigerators, inverters for commercial air conditioning, power supplies for industrial robots, and automobiles. It is suitable for applications such as a power source.
- Patent Document 1 a circuit board having excellent stress relaxation properties, heat resistance, moisture resistance, and heat dissipation properties is manufactured using a circuit board composition containing a specific epoxy resin, a curing agent, and an inorganic filler as essential components. A method for obtaining is disclosed.
- the ceramic circuit board has the problem that solder cracks are likely to occur on the board during heat cycles, but by replacing it with a metal-based circuit board, it is expected that the occurrence of solder cracks will be suppressed.
- high-temperature treatments such as solder reflow treatment are performed. there was a case.
- an object of the present invention to provide a laminate capable of forming a metal-based circuit board that has excellent insulation reliability under conditions of high voltage application and that can maintain high adhesion reliability even after high-temperature treatment.
- Another object of the present invention is to provide a metal base circuit board which has excellent insulation reliability under conditions of high voltage application and which can maintain high adhesion reliability even after high temperature treatment, and a method for manufacturing the same.
- the present invention relates to, for example, the following [1] to [10].
- a laminate capable of forming a metal base circuit board that has excellent insulation reliability under conditions of high voltage application and can maintain high adhesion reliability even with high temperature treatment. Further, according to the present invention, there is provided a metal base circuit board which has excellent insulation reliability under conditions of high voltage application and which can maintain high adhesion reliability even after high temperature treatment, and a method for manufacturing the same.
- FIG. 1 is a cross-sectional view showing an embodiment of a circuit board
- FIG. 4 is a diagram showing the relationship between RSm and Rz in circuit members of Examples and Comparative Examples;
- the laminate of this embodiment includes a first metal layer, an insulating layer arranged on the first metal layer, and a second metal layer arranged on the insulating layer.
- the laminate of this embodiment can also be called a laminate for forming a circuit board.
- At least one of the bonding surface (S1) of the first metal layer with the insulating layer and the bonding surface (S2) of the second metal layer with the insulating layer has a reference length is 250 ⁇ m, the average element length RSm is 10 ⁇ m or more and 100 ⁇ m or less, and the maximum height Rz is 1 ⁇ m or more and 20 ⁇ m or less.
- the laminate of the present embodiment has excellent insulation reliability under conditions of high voltage application (in particular, the effect of suppressing deterioration of electrical insulation over time), and can maintain high adhesion reliability even with high temperature treatment.
- a metal base circuit board can be formed.
- the laminate of the present embodiment exhibits an effect related to insulation reliability, at least one of the metal layers is in a roughened state exhibiting the surface roughness curve described above, so that a high voltage can be applied. It is considered that this is because the electric field concentration is suppressed at times, and the deterioration of the insulation reliability caused by the electric field concentration is suppressed.
- the laminate of the present embodiment exhibits an effect related to adhesion reliability is not necessarily clear, by making at least one of the metal layers in a roughened state exhibiting the above-described surface roughness curve, the metal It is believed that this is because the interface between the layer and the insulating layer becomes more resistant to thermal stress during high-temperature treatment, thereby suppressing deterioration in adhesion reliability due to high-temperature treatment.
- the surface roughness curve is measured with a laser microscope (Keyence VK-X1000).
- the average length of the elements indicates the average length of the roughness curve elements in the reference length, and is a value calculated from the surface roughness curve in accordance with JIS B 0601.
- the maximum height (Rz) indicates the sum of the height of the highest peak (Rp) and the depth of the deepest valley (Rv) in the roughness curve at the reference length, and conforms to JIS B 0601 It is a value calculated from the surface roughness curve.
- “Indicating a specific surface roughness curve” in this embodiment means that a specific surface roughness curve is measured on at least a part of the target surface.
- the metal material constituting the first metal layer is not particularly limited, and may be, for example, aluminum, copper, iron, silver, gold, zinc, nickel, tin, alloys containing these metals, or the like.
- the first metal layer may be composed of one kind of metal material, or may be composed of two or more kinds of metal materials.
- the first metal layer preferably contains at least one metal atom (M1) selected from the group consisting of aluminum, copper, iron, silver, gold, zinc, nickel and tin.
- the metal atom (M1) is preferably at least one selected from the group consisting of aluminum, copper and iron, more preferably at least one selected from the group consisting of aluminum and copper.
- the content of the metal atoms (M1), based on the total amount of the first metal layer, may be, for example, 50% by mass or more, preferably 60% by mass or more, more preferably 70% by mass or more, and still more preferably 80% by mass. % or more, may be 90% by mass or more, or may be 100% by mass. That is, the content of the metal atoms (M1) is, for example, 50 to 100% by mass, 60 to 100% by mass, 70 to 100% by mass, 80 to 100% by mass, or 90 to 100% by mass, based on the total amount of the first metal layer. % by mass, or 100% by mass.
- the first metal layer may be, for example, a metal plate.
- the thickness of the first metal layer is not particularly limited, and may be, for example, 0.01 mm or more, preferably 0.1 mm or more, and more preferably 1.0 mm or more.
- the thickness of the first metal layer may be, for example, 10 mm or less, preferably 5.0 mm or less, and more preferably 3.0 mm or less. That is, the thickness of the first metal layer is, for example, 0.01 to 10 mm, 0.01 to 5.0 mm, 0.01 to 3.0 mm, 0.1 to 10 mm, 0.1 to 5.0 mm, 0 .1-3.0 mm, 1.0-10 mm, 1.0-5.0 mm or 1.0-3.0 mm.
- the bonding surface (S1) of the first metal layer may be a roughened surface.
- the method of roughening treatment is not particularly limited, and known roughening treatments can be used without particular limitations. Examples of roughening treatment include chemical etching treatment, blasting treatment, buffing treatment, and the like.
- the conditions for the roughening treatment are not particularly limited, and for example, conditions in which the joint surface (S1) exhibits the surface roughness curve (C), which will be described later, may be selected as appropriate.
- the metal material constituting the second metal layer is not particularly limited, and may be, for example, aluminum, copper, iron, silver, gold, zinc, nickel, tin, or alloys containing these metals.
- the second metal layer may be composed of one kind of metal material, or may be composed of two or more kinds of metal materials.
- the second metal layer preferably contains at least one metal atom (M2) selected from the group consisting of aluminum, copper, iron, silver, gold, zinc, nickel and tin.
- the metal atom (M2) is preferably at least one selected from the group consisting of aluminum, copper and iron, more preferably at least one selected from the group consisting of aluminum and copper.
- the content of the metal atoms (M2), based on the total amount of the second metal layer may be, for example, 50% by mass or more, preferably 60% by mass or more, more preferably 70% by mass or more, and still more preferably 80% by mass. % or more, may be 90% by mass or more, or may be 100% by mass. That is, the content of the metal atoms (M2) is, for example, 50 to 100% by mass, 60 to 100% by mass, 70 to 100% by mass, 80 to 100% by mass, or 90 to 100% by mass, based on the total amount of the second metal layer. % by mass, or 100% by mass.
- the second metal layer may be, for example, metal foil.
- the thickness of the second metal layer is not particularly limited, and may be, for example, 0.01 mm or more, preferably 0.02 mm or more, and more preferably 0.03 mm or more.
- the thickness of the second metal layer may be, for example, 5.0 mm or less, preferably 3.0 mm or less, and more preferably 1.0 mm or less. That is, the thickness of the second metal layer is, for example, 0.01 to 5.0 mm, 0.01 to 3.0 mm, 0.01 to 1.0 mm, 0.02 to 5.0 mm, 0.02 to 3 0 mm, 0.02-1.0 mm, 0.03-5.0 mm, 0.03-3.0 mm or 0.03-1.0 mm.
- the bonding surface (S2) of the second metal layer may be a roughened surface.
- the method of roughening treatment is not particularly limited, and known roughening treatments can be used without particular limitations. Examples of roughening treatment include chemical etching treatment, blasting treatment, buffing treatment, and the like.
- the conditions for the roughening treatment are not particularly limited, and for example, conditions in which the joint surface (S2) exhibits the surface roughness curve (C) described later may be selected as appropriate.
- the first metal layer and the second metal layer each have a joint surface (S1 or S2) with the insulating layer having a reference length of 250 ⁇ m, an average element length RSm of 10 ⁇ m or more and 100 ⁇ m or less, and a maximum height of Rz preferably exhibits a surface roughness curve (C) of 1 ⁇ m or more and 20 ⁇ m or less.
- the average element length RSm is 10 ⁇ m or more and the maximum height Rz is 20 ⁇ m or less, electric field concentration is suppressed when a high voltage is applied, and deterioration of insulation reliability due to electric field concentration is suppressed.
- the interface between the metal layer and the insulating layer can easily withstand thermal stress during high temperature treatment, and adhesion reliability due to high temperature treatment can be improved. Decrease in sexuality is suppressed.
- the average length (RSm) of the elements is preferably 15 ⁇ m or more, more preferably 20 ⁇ m or more. Also, the average length (RSm) of the elements is preferably 80 ⁇ m or less, more preferably 60 ⁇ m or less. Thereby, the above effects are exhibited more remarkably.
- the average length (RSm) of the elements may be, for example, 10-100 ⁇ m, 10-80 ⁇ m, 10-60 ⁇ m, 15-100 ⁇ m, 15-80 ⁇ m, 15-60 ⁇ m, 20-100 ⁇ m, 20-80 ⁇ m or 20-60 ⁇ m. .
- the maximum height (Rz) is preferably 1.5 ⁇ m or more, more preferably 2.0 ⁇ m or more. Also, the maximum height (Rz) is preferably 15 ⁇ m or less, more preferably 10 ⁇ m or less. Thereby, the above effects are exhibited more remarkably.
- the maximum height (Rz) is, for example, 1 to 20 ⁇ m, 1 to 15 ⁇ m, 1 to 10 ⁇ m, 1.5 to 20 ⁇ m, 1.5 to 15 ⁇ m, 1.5 to 10 ⁇ m, 2.0 to 20 ⁇ m, 2.0 to 15 ⁇ m Or it may be 2.0 to 10 ⁇ m.
- the average length (RSm) and maximum height (Rz) of the elements preferably satisfy the following formula (A). This tends to improve the insulation reliability of the circuit board. RSm ⁇ 1.25Rz+12 (A)
- the insulating layer may be, for example, a layer containing a cured insulating resin and an inorganic filler.
- the insulating resin cured body may be, for example, a cured body of a resin component containing a thermosetting resin and a curing agent.
- thermosetting resins examples include epoxy resins, silicone resins, phenol resins, cyanate resins, melamine resins, urea resins, thermosetting polyimide resins, and unsaturated polyester resins.
- Epoxy resin is preferable from the viewpoint of insulation.
- epoxy resin that can be cured by a curing agent can be used.
- epoxy resins include bisphenol A type epoxy resin, bisphenol S type epoxy resin, bisphenol F type epoxy resin, hydrogenated bisphenol A type epoxy resin, polypropylene glycol type epoxy resin, polytetramethylene glycol type epoxy resin, and naphthalene type epoxy resin.
- Resins phenylmethane type epoxy resins, tetrakisphenolmethane type epoxy resins, biphenyl type epoxy resins, epoxy resins having a triazine ring, bisphenol A alkylene oxide adduct type epoxy resins, dicyclopentadiene type epoxy resins, cresol novolac type epoxy resins , phenol novolac type epoxy resins, and the like.
- Epoxy resins may be used singly or in combination of two or more.
- the curing agent may be any curing agent capable of curing the thermosetting resin, and may be appropriately selected from known curing agents according to the type of the thermosetting resin.
- thermosetting resin is an epoxy resin
- examples of curing agents include amine-based curing agents, phenol-based curing agents, acid anhydride-based curing agents, and thiol-based curing agents.
- the amine-based curing agent may be any curing agent that has an amino group and is capable of curing the epoxy resin.
- examples of amine-based curing agents include aromatic amine-based curing agents, aliphatic amine-based curing agents, and dicyandiamide.
- any known amine-based curing agent as a curing agent for epoxy resins can be used without particular limitation.
- Commercially available amine-based curing agents may be used, and for example, aliphatic polyamines, alicyclic polyamines, aromatic polyamines, and the like can be suitably used.
- the phenol-based curing agent may be any curing agent that has multiple phenolic hydroxyl groups and is capable of curing the epoxy resin.
- examples of phenol-based curing agents include novolak-type phenol resins and resol-type phenol resins.
- phenol-based curing agent a known phenol-based curing agent as a curing agent for epoxy resins can be used without particular limitation.
- a commercially available phenol-based curing agent may be used, and for example, phenol novolak, xylylene novolak, bisphenol A type novolak, and the like can be preferably used.
- the acid anhydride-based curing agent may be any curing agent that has a structure in which two carboxyl groups are dehydrated and condensed and that is capable of curing the epoxy resin.
- acid anhydride curing agents include aliphatic acid anhydrides and aromatic acid anhydrides.
- acid anhydride curing agent known acid anhydride curing agents as curing agents for epoxy resins can be used without particular limitation.
- Commercially available acid anhydride-based curing agents may be used, and for example, phthalic anhydride derivatives, maleic anhydride derivatives, and the like can be preferably used.
- the thiol-based curing agent may be any curing agent that has multiple mercapto groups and is capable of curing the epoxy resin.
- Examples of thiol-based curing agents include aliphatic thiol-based curing agents and aromatic thiol-based curing agents.
- thiol-based curing agent a thiol-based curing agent known as a curing agent for epoxy resins can be used without particular limitation.
- Commercially available thiol-based curing agents may be used, and for example, aliphatic polythioethers, aliphatic polythioesters, aromatic-containing polythioethers, etc. can be preferably used.
- the content of the curing agent in the resin component may be, for example, 1.0 parts by mass or more, preferably 10 parts by mass or more, and more preferably 20 parts by mass or more with respect to 100 parts by mass of the thermosetting resin. , 50 parts by mass or more. Further, the content of the curing agent may be, for example, 300 parts by mass or less, preferably 200 parts by mass or less, more preferably 150 parts by mass or less with respect to 100 parts by mass of the thermosetting resin, and 0 parts by mass. may be That is, the content of the curing agent in the resin component is, for example, 0 to 300 parts by mass, 0 to 200 parts by mass, 0 to 150 parts by mass, or 1.0 to 300 parts by mass with respect to 100 parts by mass of the thermosetting resin.
- 1.0 to 200 parts by mass 1.0 to 150 parts by mass, 10 to 300 parts by mass, 10 to 200 parts by mass, 10 to 150 parts by mass, 20 to 300 parts by mass, 20 to 200 parts by mass, 20 to 150 parts by weight, 50 to 300 parts by weight, 50 to 200 parts by weight, or 50 to 150 parts by weight.
- the resin component may further contain other components than those mentioned above.
- the resin component may further contain, for example, curing accelerators, discoloration inhibitors, surfactants, coupling agents, colorants, viscosity modifiers, antioxidants, ion scavengers, etc., as necessary.
- the content of other components in the resin component may be, for example, 10% by mass or less, preferably 5% by mass or less, and may be 0% by mass. That is, the total amount of the thermosetting resin and the curing agent in the resin component may be, for example, 90% by mass or more, preferably 95% by mass or more, and may be 100% by mass.
- the insulating resin hardened body is a hardened body of the resin component.
- the glass transition point of the cured insulating resin is preferably 125°C or higher, more preferably 150°C or higher. As a result, the insulation resistance of the cured body at high temperatures is improved, and an insulation layer having excellent insulation reliability at high temperatures can be formed.
- the upper limit of the glass transition point of the cured insulating resin is not particularly limited, but is preferably 400° C. or lower, more preferably 350° C. or lower. As a result, the flexibility of the cured body is further improved, and an insulating layer having even more excellent stress relaxation properties can be formed. That is, the glass transition point of the cured insulating resin may be, for example, 125 to 400°C, 125 to 350°C, 150 to 400°C, or 150 to 350°C.
- the glass transition point of the cured insulating resin indicates a value measured by the following method.
- ⁇ Method for measuring glass transition point> (1) Preparation of measurement sample A measurement sample is prepared by cutting the insulating resin cured body into a plate-like size of 0.1 mm x 5 mm x 40 mm. (2) Measurement of glass transition point Using a dynamic viscoelasticity measuring instrument (manufactured by T & A Instruments, "RSA 3”), under the conditions of a frequency of 10 Hz and a heating rate of 10 ° C./min, 30 ° C. to +300 ° C. The loss tangent (tan ⁇ ) is measured in the temperature range, and the temperature at which the value of the loss tangent is maximized is defined as the glass transition point.
- RSA 3 dynamic viscoelasticity measuring instrument
- the content of the insulating resin cured material in the insulating layer may be, for example, 1.0% by volume or more, preferably 10% by volume or more, and more preferably 20% by volume or more, based on the total volume of the insulating layer.
- the content of the cured insulating resin in the insulating layer may be, for example, 99% by volume or less, preferably 90% by volume or less, and more preferably 80% by volume or less, based on the total volume of the insulating layer. .
- the content of the insulating resin cured material in the insulating layer is, for example, 1.0 to 99% by volume, 1.0 to 90% by volume, 1.0 to 80% by volume, 10% by volume, based on the total volume of the insulating layer. It may be ⁇ 99% by volume, 10-90% by volume, 10-80% by volume, 20-99% by volume, 20-90% by volume or 20-80% by volume.
- inorganic fillers examples include inorganic fillers composed of aluminum oxide, silica, aluminum nitride, silicon nitride, boron nitride, and the like.
- the inorganic filler is an inorganic filler selected from the group consisting of aluminum oxide, silica, silicon nitride and boron nitride from the viewpoint of suppressing deterioration of electrical insulation in a high-temperature and high-humidity environment due to hydrolysis of the inorganic material. It is preferable to use the material as a main component.
- the content of the inorganic material in the inorganic filler is preferably 60% by mass or more, more preferably 70% by mass or more, and even more preferably 80% by mass or more, based on the total amount of the inorganic filler.
- the content of aluminum nitride in the inorganic filler is preferably 40% by mass or less, more preferably 30% by mass or less, and even more preferably 20% by mass or less, based on the total amount of the inorganic filler.
- an inorganic material selected from the group consisting of aluminum oxide, silica, silicon nitride, and boron nitride as a main component, such deterioration in electrical insulation due to hydrolysis is remarkably suppressed. be.
- the shape of the inorganic filler is not particularly limited, and may be particulate, scaly, polygonal, etc., and is preferably particulate.
- the maximum particle size of the inorganic filler may be, for example, 250 ⁇ m or less, preferably 200 ⁇ m or less, and more preferably 150 ⁇ m or less. This tends to further improve the electrical insulation of the insulating layer.
- the minimum particle size of the inorganic filler is not particularly limited, it may be, for example, 0.05 ⁇ m or more, preferably 0.1 ⁇ m or more, from the viewpoint of further improving the thermal conductivity of the insulating layer.
- the maximum particle size and minimum particle size of the inorganic filler indicate the d90 size and d10 size in the volume-based particle size distribution, which are measured with a laser diffraction particle size distribution analyzer.
- the maximum particle size of the inorganic filler is, for example, 0.05 to 250 ⁇ m, 0.05 to 200 ⁇ m, 0.05 to 150 ⁇ m, 0.1 to 250 ⁇ m, 0.1 to 200 ⁇ m or 0.1 to 150 ⁇ m. good.
- the content of the inorganic filler in the insulating layer may be, for example, 1.0% by volume or more, preferably 10% by volume or more, and more preferably 20% by volume or more, based on the total volume of the insulating layer.
- the content of the inorganic filler in the insulating layer may be, for example, 99% by volume or less, preferably 90% by volume or less, and more preferably 80% by volume or less, based on the total volume of the insulating layer. That is, the content of the inorganic filler in the insulating layer is, for example, 1.0 to 99% by volume, 1.0 to 90% by volume, 1.0 to 80% by volume, 10 to 99% by volume, based on the total volume of the insulating layer. % by volume, 10-90% by volume, 10-80% by volume, 20-99% by volume, 20-90% by volume, or 20-80% by volume.
- the insulating layer can be formed, for example, by curing a coating film of a composition containing the resin component and the inorganic filler.
- the coating film can be cured, for example, by heat treatment.
- the heat treatment may be performed in one step or in two steps. By performing the heat treatment in two stages, the insulating layer can be formed via the semi-cured body of the coating film.
- the temperature and time of heat treatment may be appropriately changed according to the types of thermosetting resin and curing agent.
- the heat treatment temperature may be, for example, 40 to 250° C., preferably 70 to 180° C.
- the heat treatment time may be, for example, 0.5 to 48 hours, preferably. is 1-6 hours.
- the temperature of the first heat treatment may be, for example, 40 to 150° C., preferably 50 to 100° C.
- the time of the first heat treatment is For example, it may be 0.2 to 8 hours, preferably 0.5 to 5 hours.
- the temperature of the second heat treatment may be, for example, 70 to 250° C., preferably 120 to 180° C., and the heat treatment time is, for example, 0.5 to 9 hours. , preferably 1 to 6 hours.
- the insulating layer may be formed, for example, by placing a coating film of the above composition or a semi-cured body of the coating film between the first metal layer and the second metal layer and applying heat and pressure.
- Pressurization conditions are not particularly limited. Pressurization may be performed at a surface pressure of, for example, 1 MPa or more, preferably 5 MPa or more, and more preferably 8 MPa or more. Pressurization may be performed at a surface pressure of, for example, 30 MPa or less, preferably 25 MPa or less, more preferably 20 MPa or less.
- the surface pressure may be, for example, 1 to 30 MPa, 1 to 25 MPa, 1 to 20 MPa, 5 to 30 MPa, 5 to 25 MPa, 5 to 20 MPa, 8 to 30 MPa, 8 to 25 MPa, or 8 to 20 MPa.
- the thickness of the insulating layer is not particularly limited, it may be, for example, 30 ⁇ m or more, preferably 50 ⁇ m or more, and more preferably 80 ⁇ m or more from the viewpoint of electrical insulation. From the viewpoint of heat resistance, the thickness of the insulating layer may be, for example, 500 ⁇ m or less, preferably 300 ⁇ m or less, and more preferably 200 ⁇ m or less. That is, the thickness of the insulating layer may be, for example, 30-500 ⁇ m, 30-300 ⁇ m, 30-200 ⁇ m, 50-500 ⁇ m, 50-300 ⁇ m, 50-200 ⁇ m, 80-500 ⁇ m, 80-300 ⁇ m or 80-200 ⁇ m.
- FIG. 1 is a cross-sectional view showing a preferred embodiment of the laminate.
- the first metal layer 1 has a bonding surface S1 with the insulating layer 2 .
- the second metal layer 3 has a bonding surface S2 with the insulating layer 2 .
- At least one of the joint surface S1 and the joint surface S2 exhibits the surface roughness curve (C) described above.
- a circuit board can be easily manufactured by processing the second metal layer 3 of the laminate 10 into a predetermined shape to form a metal circuit portion.
- the joint surface S1 of the first metal layer 1 preferably exhibits the above-described surface roughness curve at the portion facing the metal circuit portion. Moreover, it is preferable that the portion of the bonding surface S2 of the second metal layer 3 remaining as the metal circuit portion exhibits the above-described surface roughness curve (C). In other words, the metal circuit portion is preferably formed at a position facing the portion of the joint surface S1 that exhibits the surface roughness curve (C). Moreover, it is preferable that the metal circuit portion is formed so that the portion of the bonding surface S2 that exhibits the above-described surface roughness curve (C) remains.
- the method of forming the metal circuit portion is not particularly limited, and a known processing method may be applied.
- the circuit board of this embodiment includes a metal layer, an insulating layer arranged on the metal layer, and a metal circuit portion arranged on the insulating layer.
- At least one of the bonding surface (S1) of the metal layer with the insulating layer and the bonding surface (S3) of the metal circuit portion with the insulating layer has a reference length of 250 ⁇ m, and the element A surface roughness curve (C) having an average length RSm of 10 ⁇ m or more and 100 ⁇ m or less and a maximum height Rz of 1 ⁇ m or more and 20 ⁇ m or less is shown.
- the circuit board of the present embodiment has excellent insulation reliability (especially the effect of suppressing deterioration of electrical insulation over time) under conditions of high voltage application, and can maintain high adhesion reliability even with high temperature treatment.
- the circuit board of the present embodiment exhibits an effect related to insulation reliability
- at least one of the metal layer and the metal circuit portion is in a roughened state exhibiting the above-described surface roughness curve. , the electric field concentration is suppressed when a high voltage is applied, and the deterioration of the insulation reliability caused by the electric field concentration is suppressed.
- the circuit board of the present embodiment exhibits an effect related to adhesion reliability
- at least one of the metal layer and the metal circuit portion is roughened so as to exhibit the surface roughness curve described above.
- the interface between the metal layer or the metal circuit portion and the insulating layer can easily withstand thermal stress during high-temperature treatment, thereby suppressing deterioration in adhesion reliability due to high-temperature treatment.
- the circuit board of the present embodiment may be manufactured by partially removing the second metal layer of the laminate.
- the surface roughness curve (C) may be the same as the surface roughness curve (C) in the laminate described above.
- the same metal layer as the first metal layer in the laminate can be exemplified.
- the same insulating layer as in the laminate described above can be exemplified.
- the metal circuit part in the circuit board of the present embodiment may be the remaining part of the second metal layer in the above-described laminated body after part of the second metal layer is removed. That is, the material forming the metal circuit portion and the thickness of the metal circuit portion may be the same as the material forming the second metal layer and the thickness of the second metal layer.
- FIG. 2 is a cross-sectional view showing a preferred embodiment of the circuit board.
- the circuit board 20 shown in FIG. 2 is a circuit board manufactured from the laminate shown in FIG. 2 and a metal circuit portion 4 arranged thereon.
- the first metal layer 1 has a bonding surface S1 with the insulating layer 2 .
- the metal circuit portion 4 has a joint surface S3 with the insulating layer 2 .
- At least one of the joint surface S1 and the joint surface S3 exhibits the surface roughness curve (C) described above.
- the present invention provides, for example, a first metal layer having a roughened surface with an average element length RSm of 10 ⁇ m or more and 100 ⁇ m or less and a maximum height Rz of 1 ⁇ m or more and 20 ⁇ m or less in a surface roughness curve with a reference length of 250 ⁇ m.
- a second preparation step of preparing a a third preparation step of preparing a composition containing a resin component containing a thermosetting resin and a curing agent and an inorganic filler, and the roughened surfaces facing each other
- the first preparation step may be a step of roughening one surface of the metal layer to form the first metal layer.
- a surface roughness curve with a reference length of 250 ⁇ m of the roughened surface is measured, and the average length RSm of the elements in the surface roughness curve
- a step of sorting out the first metal layer based on the maximum height Rz may be performed.
- the second preparation step may be a step of roughening one surface of the metal layer to form a second metal layer. Also, in the second preparation step, for a metal layer having a roughened surface, a surface roughness curve with a reference length of 250 ⁇ m for the roughened surface is measured, and the average length RSm of the elements in the surface roughness curve and It may be a step of selecting the second metal layer based on the maximum height Rz.
- the invention also relates to a sorting method for sorting a laminate comprising a first metal layer, an insulating layer arranged on the first metal layer, and a second metal layer arranged on the insulating layer.
- a surface roughness curve with a reference length of 250 ⁇ m is measured on the joint surface (S1) of the first metal layer with the insulating layer, and the average length RSm in the surface roughness curve is 10 ⁇ m or more and 100 ⁇ m.
- a first sorting step of sorting laminates having a maximum height Rz of 1 ⁇ m or more and 20 ⁇ m or less may be included.
- a surface roughness curve with a reference length of 250 ⁇ m is measured for the joint surface (S2) of the second metal layer with the insulating layer, and the average length RSm in the surface roughness curve is 10 ⁇ m.
- a second sorting step may be included for sorting laminates having a thickness of 100 ⁇ m or more and a maximum height Rz of 1 ⁇ m or more and 20 ⁇ m or less.
- the above selection method may include one of the first selection process and the second selection process, or may include both.
- the present invention may further relate to a sorting method for sorting a circuit board comprising a metal layer, an insulating layer arranged on the metal layer, and a metal circuit portion arranged on the insulating layer.
- a surface roughness curve with a reference length of 250 ⁇ m is measured on the joint surface (S1) of the metal layer with the insulating layer, and the average length RSm in the surface roughness curve is 10 ⁇ m or more and 100 ⁇ m or less, and the maximum A first sorting step of sorting circuit boards having a height Rz of 1 ⁇ m or more and 20 ⁇ m or less may be included.
- a surface roughness curve with a reference length of 250 ⁇ m is measured for the joint surface (S3) of the metal circuit portion with the insulating layer, and the average length RSm in the surface roughness curve is 10 ⁇ m or more and 100 ⁇ m.
- a second sorting step of sorting circuit boards having a maximum height Rz of 1 ⁇ m or more and 20 ⁇ m or less may be included.
- the above selection method may include one of the first selection process and the second selection process, or may include both.
- Example 1 ⁇ Preparation of composition> 100 parts by mass of naphthalene type epoxy resin HP-4032D (manufactured by DIC, specific gravity 1.2 g/cm 3 ) as a thermosetting resin, and phenol novolak resin VH-4150 (manufactured by DIC, specific gravity 1.1 g/cm 3 ) as a curing agent. 3 ) 12.4 parts by mass were stirred at 170°C to obtain a mixture.
- HP-4032D manufactured by DIC, specific gravity 1.2 g/cm 3
- VH-4150 manufactured by DIC, specific gravity 1.1 g/cm 3
- composition 1.0 part by mass was stirred and mixed by a planetary mixer for 15 minutes to prepare a composition.
- the volume-based content of each component in the composition is 43.6% by volume for naphthalene type epoxy resin, 5.9% by volume for phenolic novolak resin, 49.4% by volume for boron nitride, and a wetting and dispersing agent. 0.3% by volume, 0.3% by volume of the curing accelerator, and 0.5% by volume of the imidazole compound.
- the resulting composition was applied onto a polyethylene terephthalate (PET) film having a thickness of 0.038 mm so that the thickness after semi-curing would be 0.20 mm, dried by heating at 100° C. for 70 minutes, and semi-cured.
- a cured body (B stage sheet) was produced.
- the resulting semi-cured product was peeled off from the PET film and placed on the roughened surface of a metal plate (copper plate with a thickness of 2.0 mm).
- heat curing is performed at 180 ° C. for 410 minutes while applying a surface pressure of 10 MPa with a press to form a laminate. Obtained.
- the thickness of the insulating layer in the laminate was 125 ⁇ m.
- the surface roughness curve was measured by the method described later to obtain the average length RSm and maximum height Rz of the elements. Table 1 shows the results. Also, the glass transition temperature of the cured resin constituting the insulating layer was measured. Table 1 shows the results.
- ⁇ Measurement of surface roughness curve> Observe the roughened surface of the metal plate and metal foil using a laser microscope VK-X1000 (manufactured by Keyence Corporation), and obtain a surface roughness curve with a reference length of 250 ⁇ m by line roughness measurement of data analysis software, JIS RSm and Rz were calculated by the method specified in B0601. As measurement conditions, the objective lens was set to x50 and the eyepiece lens was set to x about 20, and data at one point was acquired.
- a high-temperature high-voltage bias test (Vt) was performed on the obtained metal-based circuit board under the test conditions of applying a DC voltage of 10 kV between the circular electrode and the metal plate in an environment of 125°C.
- the endurance time was defined as the time from the start of voltage application until the leakage current value measured with a withstand voltage tester reached 10 mA or more. If the endurance time is 50 minutes or more, it can be said that the metal base circuit board has excellent insulation reliability in a high temperature environment.
- Example 1 except that the metal plate and metal foil having the values shown in Table 1, Table 2 or Table 3 for the average length RSm and maximum height Rz of the elements on the roughened surface were used.
- a laminated body and a circuit board were produced in the same manner as in .
- the insulation reliability and adhesion reliability of the obtained circuit board were evaluated in the same manner as in Example 1. The results are shown in Table 1, Table 2 or Table 3.
- Example 9 ⁇ Preparation of composition> Bisphenol A type epoxy resin EXA-850CRP (manufactured by DIC, specific gravity 1.2 g/cm 3 ) as a thermosetting resin and 100 parts by mass of diaminophenylmethane H-84B (manufactured by D Acmex, specific gravity 1.2 g/cm 3 ) as a curing agent. 1 g/cm 3 ) and 900 parts by mass of alumina AS30-1 (manufactured by Showa Denko, specific gravity 3.95 g/cm 3 ) were stirred and mixed for 15 minutes in a planetary mixer to prepare a composition. The volume-based content of each component in the composition is 24.4% by volume of bisphenol A type epoxy resin, 9.0% by volume of curing agent, and 66.6% by volume of alumina AS30-1. .
- the resulting composition was applied onto a polyethylene terephthalate (PET) film having a thickness of 0.038 mm so that the thickness after semi-curing would be 0.20 mm, and dried by heating at 100° C. for 20 minutes.
- a semi-cured body (B-stage sheet) was produced.
- the resulting semi-cured product was peeled off from the PET film and placed on the roughened surface of a metal plate (aluminum plate with a thickness of 1.5 mm).
- heat curing is performed at 180 ° C. for 410 minutes while applying a surface pressure of 10 MPa with a press to form a laminate. Obtained.
- the thickness of the insulating layer in the laminate was 130 ⁇ m.
- the surface roughness curves were measured in the same manner as in Example 1, and the average length RSm and maximum height Rz of the elements were obtained. Table 2 shows the results. Also, the glass transition temperature of the cured resin constituting the insulating layer was measured. Table 2 shows the results.
- FIG. 3 is a diagram showing the relationship between RSm and Rz of the metal plates of Examples 1-6, 8 and 9, and Comparative Examples 1-4.
- circled points indicate Examples 2, 3, 5, 6, 8 or 9, triangle points indicate Example 1 or 4, and squares indicate The dots indicate Comparative Examples 1-4.
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Abstract
Description
[1]
第一の金属層と、
前記第一の金属層上に配置された絶縁層と、
前記絶縁層上に配置された第二の金属層と、
を備え、
前記第一の金属層の前記絶縁層との接合面、及び、前記第二の金属層の前記絶縁層との接合面のうち少なくとも一方が、基準長さが250μm、要素の平均長さRSmが10μm以上100μm以下、且つ、最大高さRzが1μm以上20μm以下の表面粗さ曲線を示す、積層体。
[2]
前記第一の金属層の前記絶縁層との接合面、及び、前記第二の金属層の前記絶縁層との接合面の両方が前記表面粗さ曲線を示す、[1]に記載の積層体。
[3]
前記絶縁層の厚みが30μm以上である、[1]又は[2]に記載の積層体。
[4]
前記第一の金属層及び前記第二の金属層が、アルミニウム、銅、鉄、銀、金、亜鉛、ニッケル及び錫からなる群より選択される少なくとも一種の金属原子を60質量%以上含有する、[1]~[3]のいずれかに記載の積層体。
[5]
前記絶縁層が、絶縁性樹脂硬化体と無機充填材とを含有する、[1]~[4]のいずれかに記載の積層体。
[6]
前記要素の平均長さRSm及び前記最大高さRzが、下記式(A)を満たす、[1]~[5]のいずれかに記載の積層体。
RSm≧1.25Rz+12 …(A)
[7]
金属層と、前記金属層上に配置された絶縁層と、前記絶縁層上に配置された金属回路部と、を備え、
前記金属層の前記絶縁層との接合面、及び、前記金属回路部の前記絶縁層との接合面のうち少なくとも一方が、基準長さが250μm、要素の平均長さRSmが10μm以上100μm以下、且つ、最大高さRzが1μm以上20μm以下の表面粗さ曲線を示す、回路基板。
[8]
前記金属層の前記絶縁層との接合面、及び、前記金属回路部の前記絶縁層との接合面の両方が前記表面粗さ曲線を示す、[7]に記載の回路基板。
[9]
前記要素の平均長さRSm及び前記最大高さRzが、下記式(A)を満たす、[7]又は[8]に記載の回路基板。
RSm≧1.25Rz+12 …(A)
[10]
[1]~[6]に記載の積層体を準備する工程と、
前記積層体の前記第一の金属層の一部、又は、前記第二の金属層の一部を除去して、金属回路部を形成する工程と、
を含む、回路基板の製造方法。
本実施形態の積層体は、第一の金属層と、第一の金属層上に配置された絶縁層と、絶縁層上に配置された第二の金属層と、を備える。本実施形態の積層体は、回路基板形成用積層体ということもできる。
第一の金属層を構成する金属材料は特に限定されず、例えば、アルミニウム、銅、鉄、銀、金、亜鉛、ニッケル、錫、及び、これらの金属を含む合金等であってよい。第一の金属層は一種の金属材料から構成されていてよく、二種以上の金属材料から構成されていてもよい。
すなわち、金属原子(M2)の含有量は、第二の金属層の全量基準で、例えば50~100質量%、60~100質量%、70~100質量%、80~100質量%又は90~100質量%であってよく、100質量%であってもよい。
RSm≧1.25Rz+12 …(A)
絶縁層は、例えば、絶縁性樹脂硬化体と無機充填材とを含有する層であってよい。
<ガラス転移点の測定方法>
(1)測定試料の作製
絶縁性樹脂硬化体を0.1mm×5mm×40mmの板状のサイズに切り出して、測定試料を作成する。
(2)ガラス転移点の測定
動的粘弾性測定器(T&Aインスツルメント社製、「RSA 3」)を用い、周波数10Hz、昇温速度10℃/minの条件下、30℃~+300℃の温度範囲で損失正接(tanδ)を測定し、損失正接の値が極大となる温度をガラス転移点とする。
本実施形態の回路基板は、金属層と、金属層上に配置された絶縁層と、絶縁層上に配置された金属回路部と、を備える。
<組成物の作製>
熱硬化性樹脂としてナフタレン型エポキシ樹脂HP-4032D(DIC社製、比重1.2g/cm3)100質量部と、硬化剤としてフェノールノボラック樹脂VH-4150(DIC社製、比重1.1g/cm3)12.4質量部と、を170℃で攪拌して混合物を得た。次いで、当該混合物と、窒化ホウ素(デンカ社製、比重2.27g/cm3)214.8質量部と、湿潤分散剤DISPER BYK111(ビック・ケミー社製、比重1.1g/cm3)0.7質量部と、硬化促進剤としてTPP(北興化学社製、比重1.1g/cm3)0.6質量部と、イミダゾール化合物2PHZ-PW(四国化成工業社製、比重1.1g/cm3)1.0質量部とを、プラネタリーミキサーで15分間攪拌混合し、組成物を作製した。なお、組成物中の各成分の体積基準の含有量は、ナフタレン型エポキシ樹脂が43.6体積%、フェノールノボラック樹脂が5.9体積%、窒化ホウ素が49.4体積%、湿潤分散剤が0.3体積%、硬化促進剤が0.3体積%、イミダゾール化合物が0.5体積%である。
得られた組成物を、厚さ0.038mmのポリエチレンテレフタレート(PET)製のフィルム上に、半硬化後の厚さが0.20mmになるように塗布し、100℃70分加熱乾燥させ、半硬化体(Bステージシート)を作製した。得られた半硬化体をPETフィルムからはがし、金属板(厚さ2.0mmの銅板)の粗化面上に配置した。次いで、半硬化体上に金属箔(厚さ0.5mmの銅箔)の粗化面を配置した後、プレス機によって面圧10MPaをかけながら、180℃で410分間加熱硬化し、積層体を得た。積層体中の絶縁層の厚さは125μmであった。
積層体の金属箔上の所定の位置をエッチングレジストでマスクした後、硫酸-過酸化水素混合溶液をエッチング液として銅箔をエッチングした。エッチングレジストを除去し、洗浄乾燥することで、直径20mmの円電極(銅箔)を有する金属ベース回路基板を得た。得られた金属ベース回路基板について、以下の方法で絶縁信頼性及び接着信頼性の評価を行った。結果を表1に示す。
金属板及び金属箔の粗化面を、レーザー顕微鏡VK-X1000(キーエンス社製)を用いて観察し、データ解析ソフトの線粗さ測定により基準長さ250μmの表面粗さ曲線を得て、JIS B 0601に定められた方法によりRSm、Rzを算出した。測定条件として、対物レンズはx50、接眼レンズはx約20の設定とし、1箇所のデータを取得した。
得られた金属ベース回路基板について、125℃環境下で、円電極-金属板間に直流10kVの電圧を印加する試験条件で、高温高圧バイアス試験(V-t)を行った。電圧印加開始時から、耐電圧試験機で測定した漏れ電流値が10mA以上となった時点までの時間を、耐久時間とした。耐久時間が50分以上であれば、高温環境下での絶縁信頼性が優れた金属ベース回路基板であるといえる。
まず、破壊試験として、回路基板を285℃のホットプレート上で5分間加熱処理をした後、室温まで冷却後、金属板及び金属箔を絶縁層から剥離した。この破壊試験において、絶縁層の凝集破壊が生じた場合をA、金属板と絶縁層との界面、又は、金属箔と絶縁層との界面で界面破壊が生じた場合をBとして、接着信頼性を評価した。
金属板及び金属箔として、粗化面における要素の平均長さRSm及び最大高さRzが表1、表2又は表3に示す値の金属板及び金属箔を用いたこと以外は、実施例1と同様にして積層体の作製及び回路基板の作製を行った。得られた回路基板について、実施例1と同様にして絶縁信頼性及び接着信頼性を評価した。結果を表1、表2又は表3に示す。
<組成物の作製>
熱硬化性樹脂としてビスフェノールA型エポキシ樹脂EXA-850CRP(DIC社製、比重1.2g/cm3)100質量部と、硬化剤としてジアミノフェニルメタンH-84B(Dアクメックス社製、比重1.1g/cm3)34質量部と、アルミナAS30-1(昭和電工社製、比重3.95g/cm3)900質量部とを、プラネタリーミキサーで15分間攪拌混合し、組成物を作製した。なお、組成物中の各成分の体積基準の含有量は、ビスフェノールA型エポキシ樹脂が24.4体積%と、硬化剤が9.0体積%、アルミナAS30-1が66.6体積%である。
得られた組成物を、厚さ0.038mmのポリエチレンテレフタレート(PET)製のフィルム上に、半硬化後の厚さが0.20mmになるように塗布し、100℃20分加熱乾燥させ、これにより半硬化体(Bステージシート)を作製した。得られた半硬化体をPETフィルムからはがし、金属板(厚さ1.5mmのアルミ板)の粗化面上に配置した。次いで、半硬化体上に金属箔(厚さ0.5mmの銅箔)の粗化面を配置した後、プレス機によって面圧10MPaをかけながら、180℃で410分間加熱硬化し、積層体を得た。積層体中の絶縁層の厚さは130μmであった。
積層体の金属箔上の所定の位置をエッチングレジストでマスクした後、硫酸-過酸化水素混合溶液をエッチング液として銅箔をエッチングした。エッチングレジストを除去し、洗浄乾燥することで、直径20mmの円電極(銅箔)を有する金属ベース回路基板を得た。得られた金属ベース回路基板について、実施例1と同様にして絶縁信頼性及び接着信頼性の評価を行った。結果を表2に示す。
RSm≧1.25Rz+12 …(A)
Claims (10)
- 第一の金属層と、
前記第一の金属層上に配置された絶縁層と、
前記絶縁層上に配置された第二の金属層と、
を備え、
前記第一の金属層の前記絶縁層との接合面、及び、前記第二の金属層の前記絶縁層との接合面のうち少なくとも一方が、基準長さが250μm、要素の平均長さRSmが10μm以上100μm以下、且つ、最大高さRzが1μm以上20μm以下の表面粗さ曲線を示す、積層体。 - 前記第一の金属層の前記絶縁層との接合面、及び、前記第二の金属層の前記絶縁層との接合面の両方が前記表面粗さ曲線を示す、請求項1に記載の積層体。
- 前記絶縁層の厚みが30μm以上である、請求項1又は2に記載の積層体。
- 前記第一の金属層及び前記第二の金属層が、アルミニウム、銅、鉄、銀、金、亜鉛、ニッケル及び錫からなる群より選択される少なくとも一種の金属原子を60質量%以上含有する、請求項1又は2に記載の積層体。
- 前記絶縁層が、絶縁性樹脂硬化体と無機充填材とを含有する、請求項1又は2に記載の積層体。
- 前記要素の平均長さRSm及び前記最大高さRzが、下記式(A)を満たす、請求項1又は2に記載の積層体。
RSm≧1.25Rz+12 …(A) - 金属層と、前記金属層上に配置された絶縁層と、前記絶縁層上に配置された金属回路部と、を備え、
前記金属層の前記絶縁層との接合面、及び、前記金属回路部の前記絶縁層との接合面のうち少なくとも一方が、基準長さが250μm、要素の平均長さRSmが10μm以上100μm以下、且つ、最大高さRzが1μm以上20μm以下の表面粗さ曲線を示す、回路基板。 - 前記金属層の前記絶縁層との接合面、及び、前記金属回路部の前記絶縁層との接合面の両方が前記表面粗さ曲線を示す、請求項7に記載の回路基板。
- 前記要素の平均長さRSm及び前記最大高さRzが、下記式(A)を満たす、請求項7又は8に記載の回路基板。
RSm≧1.25Rz+12 …(A) - 請求項1又は2に記載の積層体を準備する工程と、
前記積層体の前記第一の金属層の一部、又は、前記第二の金属層の一部を除去して、金属回路部を形成する工程と、
を含む、回路基板の製造方法。
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