USRE49929E1 - Substrate for high-frequency printed wiring board - Google Patents

Substrate for high-frequency printed wiring board Download PDF

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Publication number
USRE49929E1
USRE49929E1 US17/528,405 US201817528405A USRE49929E US RE49929 E1 USRE49929 E1 US RE49929E1 US 201817528405 A US201817528405 A US 201817528405A US RE49929 E USRE49929 E US RE49929E
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Prior art keywords
substrate
dielectric layer
printed wiring
copper foil
wiring board
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US17/528,405
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Inventor
Shingo Kaimori
Masaaki Yamauchi
Kentaro Okamoto
Satoshi KIYA
Kazuo Murata
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Sumitomo Electric Industries Ltd
Sumitomo Electric Printed Circuits Inc
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Sumitomo Electric Industries Ltd
Sumitomo Electric Printed Circuits Inc
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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
    • H05K1/03—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
    • 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
    • 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
    • B32B15/082—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 comprising vinyl resins; comprising acrylic resins
    • 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
    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • 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
    • 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
    • H05K1/032—Organic insulating material consisting of one material
    • H05K1/034—Organic insulating material consisting of one material containing halogen
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/09—Use of materials for the conductive, e.g. metallic pattern
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/0011—Working of insulating substrates or insulating layers
    • H05K3/0055—After-treatment, e.g. cleaning or desmearing of holes
    • 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
    • H05K3/381—Improvement of the adhesion between the insulating substrate and the metal by special treatment of 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
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/01—Dielectrics
    • H05K2201/0137—Materials
    • H05K2201/015—Fluoropolymer, e.g. polytetrafluoroethylene [PTFE]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/02—Fillers; Particles; Fibers; Reinforcement materials
    • H05K2201/0203—Fillers and particles
    • H05K2201/0206—Materials
    • H05K2201/0209—Inorganic, non-metallic particles
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/02—Fillers; Particles; Fibers; Reinforcement materials
    • H05K2201/0203—Fillers and particles
    • H05K2201/0263—Details about a collection of particles
    • H05K2201/0269—Non-uniform distribution or concentration of particles
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/02—Fillers; Particles; Fibers; Reinforcement materials
    • H05K2201/0275—Fibers and reinforcement materials
    • H05K2201/029—Woven fibrous reinforcement or textile
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/03—Conductive materials
    • H05K2201/0332—Structure of the conductor
    • H05K2201/0335—Layered conductors or foils
    • H05K2201/0355—Metal foils
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/06—Thermal details
    • H05K2201/068—Thermal details wherein the coefficient of thermal expansion is important
    • 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
    • H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
    • H05K2203/11—Treatments characterised by their effect, e.g. heating, cooling, roughening
    • H05K2203/1194—Thermal treatment leading to a different chemical state of a material, e.g. annealing for stress-relief, aging

Definitions

  • the present disclosure relates to a substrate for a high-frequency printed wiring board.
  • the present application claims a priority based on Japanese Patent Application No. 2017-153721 filed on Aug. 8, 2017, the entire content of which is incorporated herein by reference.
  • a technique for improving the high-frequency characteristic of the printed wiring board it has been considered to use, as a material of the dielectric layer, a composite material in which an inorganic filler such as minute glass or a particulate ceramic filler material is included in a fluororesin matrix such as polytetrafluoroethylene (see U.S. Pat. Nos. 4,886,699 and 5,358,775).
  • a method for forming the dielectric layer using such a composite material the following method has been proposed: dipropylene glycol is mixed as a lubricant to the fine fluoropolymer powder and the inorganic filler, and cold extrusion into a form of a sheet is performed.
  • a silane-based coupling agent having a functional group including a N atom or S atom is present in the vicinity of an interface therebetween (see WO 2014/192718).
  • a first embodiment of a substrate for a high-frequency printed wiring board according to the present disclosure is directed to a substrate for a high-frequency printed wiring board, the substrate including: a dielectric layer including a fluororesin and an inorganic filler; and a copper foil layered on at least one surface of the dielectric layer, wherein a surface of the copper foil at the dielectric layer side has a maximum height roughness (Rz) of less than or equal to 2 ⁇ m, and a ratio of the number of inorganic atoms of the inorganic filler to the number of fluorine atoms of the fluororesin in a superficial region of the dielectric layer at the copper foil side is less than or equal to 0.08.
  • Rz maximum height roughness
  • a second embodiment of the substrate for a high-frequency printed wiring board is directed to a substrate for a high-frequency printed wiring board, the substrate including: a dielectric layer including a fluororesin and an inorganic filler; and a copper foil layered on at least one surface of the dielectric layer, wherein a surface of the copper foil at the dielectric layer side has a maximum height roughness (Rz) of less than or equal to 2 ⁇ m, and in a cross section of the dielectric layer in a direction perpendicular to the copper foil, a ratio of a total cross sectional area of the inorganic filler to an overall cross sectional area in a region at a distance of more than or equal to 18 0 ⁇ m and less than or equal to 22 2 ⁇ m from the copper foil is 0.7 time or less as large as a ratio of a total cross sectional area of the inorganic filler to an overall cross sectional area in a region at a distance of more than or equal to 0 18 ⁇
  • FIG. 1 is a schematic cross sectional view of a substrate for a high-frequency printed wiring board according to a first embodiment of the present disclosure.
  • FIG. 2 is a schematic cross sectional view of a substrate for a high-frequency printed wiring board according to a second embodiment of the present disclosure.
  • FIG. 3 is a schematic cross sectional view of the substrate for a high-frequency printed wiring board to show regions in each of which a ratio of a cross sectional area of an inorganic filler is measured.
  • FIG. 4 is a schematic cross sectional view of a substrate for a high-frequency printed wiring board according to a third embodiment of the present disclosure.
  • FIG. 5 is a schematic cross sectional view of a substrate for a high-frequency printed wiring board according to a fourth embodiment of the present disclosure.
  • FIG. 6 is a schematic cross sectional view of a substrate for a high-frequency printed wiring board according to a fifth embodiment of the present disclosure.
  • FIG. 7 is a schematic cross sectional view of a substrate for a high-frequency printed wiring board according to a sixth embodiment of the present disclosure.
  • the adhesive strength between the dielectric layer and the copper foil are insufficient even with the above-described conventional method.
  • the present invention has been made based on the above circumstance and has an object to provide a substrate for an high-frequency printed wiring board, which allows for an improved adhesive strength and allows for an excellent high-frequency characteristic.
  • the substrate for a high-frequency printed wiring board according to the present invention allows for an improved adhesive strength and allows for an excellent high-frequency characteristic.
  • a first embodiment of a substrate for a high-frequency printed wiring board according to the present disclosure is directed to a substrate for a high-frequency printed wiring board, the substrate including: a dielectric layer including a fluororesin and an inorganic filler; and a copper foil layered on at least one surface of the dielectric layer, wherein a surface of the copper foil at the dielectric layer side has a maximum height roughness (Rz) of less than or equal to 2 ⁇ m, and a ratio of the number of inorganic atoms of the inorganic filler to the number of fluorine atoms of the fluororesin in a superficial region of the dielectric layer at the copper foil side is less than or equal to 0.08.
  • Rz maximum height roughness
  • the dielectric layer includes the fluororesin and the inorganic filler; however, an adhesive strength for the smooth copper foil having a Rz of less than or equal to the above-described value can be increased when the atomic ratio of (the inorganic atoms of the inorganic filler)/(the fluorine atoms of the fluororesin) is less than or equal to the specified value above.
  • the dielectric layer includes the fluororesin and the inorganic filler and the smooth copper foil can be used in the substrate for a high-frequency printed wiring board, the high frequency characteristic can be excellent. This is presumably due to the following reason.
  • this portion has a relatively low elastic modulus to result in large tensility, with the result that when force to detach from the copper foil is applied to the dielectric layer, the force is scattered in the vicinity of the interface. Accordingly, the force is avoided from being applied only to the interface, whereby the high adhesive strength is obtained.
  • a second embodiment of the substrate for a high-frequency printed wiring board according to the present disclosure is directed to a substrate for a high-frequency printed wiring board, the substrate including: a dielectric layer including a fluororesin and an inorganic filler; and a copper foil layered on at least one surface of the dielectric layer, wherein a surface of the copper foil at the dielectric layer side has a maximum height roughness (Rz) of less than or equal to 2 ⁇ m, and in a cross section of the dielectric layer in a direction perpendicular to the copper foil, a ratio of a total cross sectional area of the inorganic filler to an overall cross sectional area in a region at a distance of more than or equal to 18 0 ⁇ m and less than or equal to 22 2 ⁇ m from the copper foil is 0.7 time or less as large as a ratio of a total cross sectional area of the inorganic filler to an overall cross sectional area in a region at a distance of more than or equal to 0 18 ⁇ m and
  • the dielectric layer includes the fluororesin and the inorganic filler; however, an adhesive strength for the smooth copper foil having a Rz of less than or equal to the above-described value can be increased when the multiple value in connection with the amount (the ratio of the total cross sectional area of the inorganic filler) of the inorganic filler in each of the region adjacent to the copper foil and the region distant away from the copper foil is less than or equal to the above-described specified value.
  • the dielectric layer includes the fluororesin and the inorganic filler and the smooth copper foil can be used in the substrate for a high-frequency printed wiring board, the high-frequency characteristic can be excellent.
  • a softening temperature of the fluororesin is more than or equal to 250° C. and less than or equal to 310° C.
  • the softening temperature of the fluororesin thus falls within the above-described range, the dielectric layer and the copper foil can be layered on each other more readily.
  • the fluororesin is a tetrafluoroethylene-hexafluoropropylene copolymer, a tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, polytetrafluoroethylene, or a combination of the tetrafluoroethylene-hexafluoropropylene copolymer, the tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, and the polytetrafluoroethylene. More preferably, the fluororesin is the tetrafluoroethylene-hexafluoropropylene copolymer.
  • a mass ratio of the inorganic filler to the fluororesin in the dielectric layer is more than or equal to 1.0.
  • the inorganic filler may include silica.
  • Silica is comparatively inexpensive, has a permittivity of 3.8 (1 MHz), which is not large, and is less changed by a temperature in a temperature range (for example, from ⁇ 10° C. to 150° C.) in which a substrate is generally used.
  • various sizes of silica can be obtained readily in the market. By selecting an appropriate size thereof, physical property variation within a plane of the substrate can be suppressed while maintaining flexibility of the substrate.
  • the specific gravity of silica is close to that of the fluororesin, silica is less likely to settle down and a degree of settling-down can be controlled with precision.
  • a linear expansion coefficient of the substrate for a high-frequency printed wiring board in a thickness direction may be less than or equal to 50 ppm/K.
  • a change of permittivity of the substrate for a high-frequency printed wiring board by a temperature in a range of 25° C. to 120° C. may be less than or equal to 2%.
  • the linear expansion coefficient in the thickness direction can be small and the change of the permittivity by the temperature can be small, whereby conductivity characteristic and antenna characteristic of a high-frequency device can be suppressed from being changed and these characteristics of the high-frequency device can be designed readily.
  • the following describes a substrate for a high-frequency printed wiring board and a method for manufacturing the substrate for a high-frequency printed wiring board according to an embodiment of the present disclosure.
  • a substrate 1 for a high-frequency printed wiring board includes a dielectric layer 2 and a copper foil 3 layered on dielectric layer 2 .
  • the substrate for a high-frequency printed wiring board is used as a substrate of a printed wiring board.
  • Dielectric layer 2 includes a fluororesin and an inorganic filler.
  • the fluororesin refers to a resin in which a fluorine atom or an organic group (hereinafter, also referred to as “fluorine atom containing group”) including a fluorine atom substitutes for at least one of hydrogen atoms coupled to carbon atoms included in a repeating unit of a high polymer chain.
  • the fluorine atom containing group is such a group that a fluorine atom substitutes for at least one of hydrogen atoms in a straight-chain or branched organic group.
  • Examples of the fluorine atom containing group include a fluoroalkyl group, a fluoroalkoxy group, a fluoropolyether group, and the like.
  • fluoroalkyl group means an alkyl group in which a fluorine atom substitutes for at least one hydrogen atom. Examples thereof include a “perfluoroalkyl group” and the like. Specific examples of the fluoroalkyl group include: a group in which fluorine atoms substitute for all the hydrogen atoms of the alkyl group; a group in which fluorine atoms substitute for hydrogen atoms other than one terminal hydrogen atom of the alkyl group; and the like.
  • fluoropolyether group means a monovalent group having an oxyalkylene unit as a repeating unit and having an alkyl group or a hydrogen atom at its terminal, wherein a fluorine atom substitutes for at least one hydrogen atom of the alkylene oxide chain or the terminal alkyl group.
  • fluoropolyether group include: a “perfluoropolyether group” having a plurality of perfluoroalkylene oxide chains as a repeating unit; and the like.
  • the lower limit of the softening temperature of the fluororesin is preferably 250° C. and is more preferably 270° C.
  • the upper limit of the above-described softening temperature is preferably 310° C., and is more preferably 300° C.
  • dielectric layer 2 and copper foil 3 can be readily layered on each other.
  • fluororesin examples include: polytetrafluoroethylene (PTFE); a tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA); a tetrafluoroethylene-hexafluoropropylene copolymer (FEP); a tetrafluoroethylene-ethylene copolymer (PFE); polyvinylidene fluoride (PVDF); polychlorotrifluoroethylene (PCTFE); a chlorotrifluoroethylene-ethylene copolymer (ECTFE); polyvinyl fluoride (PVF); and a thermoplastic fluororesin (THV) and a fluoroelastomer, each of which is composed of three types of monomers, i.e., tetrafluoroethylene, hexafluoropropylene, and vinylidene fluoride. Moreover, a mixture or copolymer including these compounds can be used as the above-described fluororesin.
  • the tetrafluoroethylene-hexafluoropropylene copolymer (FEP), the tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), polytetrafluoroethylene (PTFE), and a combination thereof are preferable.
  • FEP tetrafluoroethylene-hexafluoropropylene copolymer
  • PFA tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer
  • PTFE polytetrafluoroethylene
  • the FEP, PFA, and PTFE are preferable as the fluororesin presumably because these fluororesins have a small high-frequency characteristic, particularly, a small dielectric loss tangent.
  • these fluororesins can be readily produced to have a high molecular weight, and such fluororesins each having a high molecular weight are considered to have excellent tensility and the like.
  • the characteristics of the fluororesin such as flexibility and high tensility can be maintained, with the result that it is expected to maintain high adhesion.
  • the molecular weight (weight average molecular weight) of the FEP is preferably more than or equal to 200,000 and less than or equal to 1,200,000, is more preferably more than or equal to 300,000 and less than or equal to 1,000,000, and is further preferably more than or equal to 400,000 and less than or equal to 1,000,000.
  • the molecular weight (weight average molecular weight) of the PFA is preferably more than or equal to 200,000 and less than or equal to 1,200,000, is more preferably more than or equal to 300,000 and less than or equal to 1,000,000, and is further preferably more than or equal to 400,000 and less than or equal to 1,000,000.
  • the molecular weight (weight average molecular weight) of the PTFE is preferably more than or equal to 1,000,000 and less than or equal to 10,000,000, and is more preferably more than or equal to 1,500,000 and less than or equal to 5,000,000.
  • the lower limit of the content of the fluororesin in dielectric layer 2 is preferably 10 volume %, is more preferably 20 volume %, and is further preferably 30 volume %.
  • the upper limit of the content of the fluororesin is preferably 80 volume %, is more preferably 60 volume %, and is further preferably 40 volume %.
  • the inorganic filler is a filler including an inorganic atom.
  • the inorganic atom means a metal atom or a semimetal atom.
  • the inorganic filler may include one type or two or more types of inorganic atoms. It should be noted that the inorganic filler needs to be an insulator.
  • Examples of the metal atom include group 1 to group 13 metal atoms in the periodic table. Among these, magnesium, calcium, barium, titanium, zirconium, and aluminum are preferable.
  • Examples of the semimetal atom include boron, silicon, and the like. Among these, silicon is preferable.
  • the inorganic filler examples include titanium oxide, talc, silica, aluminum oxide, zirconium oxide, barium sulfate, calcium carbonate, aluminum hydroxide, magnesium hydroxide, potassium titanate, magnesium oxide, calcium oxide, clay, and the like.
  • silica, titanium oxide, and talc are preferable.
  • Silica is more preferable. It should be noted that one type or two or more types of inorganic fillers may be included.
  • the shape of the inorganic filler is not limited particularly.
  • Examples of the shape of the inorganic filler include a particulate shape, a spherical shape, a scale-like shape, a needle-like shape, and the like.
  • the shape is the scale-like or needle-like shape, higher adhesion can be attained by arranging the filler having anisotropy.
  • the spherical-shaped filler is preferable due to the following points: the spherical-shaped filler has a small surface area and therefore has a small influence over the characteristics of the fluororesin; and when blended with a liquid material, a degree of thickening is small.
  • the lower limit of the average particle size of the inorganic filler is preferably 0.1 ⁇ m, and is more preferably 0.5 Moreover, the upper limit of the average particle size of the inorganic filler is preferably 10 ⁇ m, and is more preferably 5 ⁇ m.
  • the average particle size of the inorganic filler is less than the above-described lower limit, the characteristics of the fluororesin such as flexibility may be decreased.
  • the average particle size of the inorganic filler is more than the above-described upper limit, the characteristics may be greatly varied among portions in the dielectric layer of the substrate for a high-frequency printed wiring board.
  • the term “average particle size” herein means a particle size represented by center size D50 of a volume particle size distribution in a fluid dispersion.
  • the lower limit of the content of the inorganic filler in dielectric layer 2 is preferably 10 volume %, is more preferably 20 volume %, and is further preferably 30 volume %.
  • the upper limit of the content of the inorganic filler is preferably 90 volume %, is more preferably 70 volume %, and is further preferably 60 volume %.
  • the lower limit of the mass ratio (inorganic filler/fluororesin) of the inorganic filler to the fluororesin in dielectric layer 2 is preferably 1.0, is more preferably 1.1, is further preferably 1.2, and is particularly preferably 1.3.
  • the upper limit of the above-described mass ratio is, for example, 3.0, and is preferably 2.0.
  • the inorganic filler when silica is used as the inorganic filler, by setting the mass ratio of the silica to the fluororesin to be more than or equal to 1.0, the linear expansion coefficient of the substrate for a high-frequency printed wiring board in the thickness direction can be suppressed to be less than or equal to 50 ppm/K. Moreover, a change of the permittivity thereof by a temperature in a range of 25° C. to 120° C. can be suppressed to be less than or equal to 2%.
  • dielectric layer 2 can include an engineering plastic, a flame retardant, a flame retardant aid, a pigment, an antioxidant, a reflecting agent, a masking agent, a lubricant, a process stabilizer, a plasticizer, a foaming agent, and the like.
  • the upper limit of the total content of the optional components in dielectric layer 2 is preferably 50 mass %, is more preferably 40 mass %, and is further preferably 30 mass %.
  • the above-described engineering plastic to be used can be selected from known engineering plastics in accordance with required characteristics of dielectric layer 2 .
  • an aromatic polyether ketone can be used.
  • This aromatic polyether ketone is a thermoplastic resin having a structure in which benzene rings are coupled at para positions and are connected to each other by a rigid ketone bond (—C( ⁇ O)—) or a flexible ether bond (—O—).
  • aromatic polyether ketone examples include: polyetheretherketone (PEEK) having a structural unit in which an ether bond, a benzene ring, an ether bond, a benzene ring, a ketone bond, and a benzene ring are arranged in this order; and polyetherketone (PEK) having a structural unit in which an ether bond, a benzene ring, a ketone bond, and a benzene ring are arranged in this order.
  • PEEK is preferable as the aromatic polyether ketone.
  • Such an aromatic polyether ketone is excellent with regard to wear resistance, thermal resistance, insulating property, processability, and the like.
  • aromatic polyether ketone such as PEEK
  • a commercially available aromatic polyether ketone can be used.
  • a commercially available aromatic polyether ketone in a single grade may be used, aromatic polyether ketones in a plurality of grades may be used, or a modified aromatic polyether ketone may be used.
  • flame retardant various types of known flame retardants can be used. Examples thereof include: a halogen-based flame retardant such as a bromine-based flame retardant or a chlorine-based flame retardant; and the like.
  • flame retardant aid various types of known flame retardant aids can be used, such as antimony trioxide and the like.
  • pigments various types can be used, such as titanium oxide and the like.
  • antioxidants various types of known antioxidants can be used, such as a phenol-based antioxidant and the like.
  • reflecting agent various types of known reflecting agents can be used, such as titanium oxide and the like.
  • dielectric layer 2 may be provided with a hollow structure.
  • the relative permittivity of dielectric layer 2 can be made small, whereby the transmission loss can be suppressed more effectively and the high-frequency characteristic can be more improved.
  • the lower limit of the average thickness of dielectric layer 2 is preferably 5 ⁇ m and is more preferably 10 ⁇ m.
  • the upper limit of the average thickness of dielectric layer 2 is preferably 0.2 mm, is more preferably 0.1 mm, and is particularly preferably 70 ⁇ m.
  • the average thickness of dielectric layer 2 is less than the above-described lower limit, the strength of dielectric layer 2 becomes insufficient, with the result that ease of handling may be decreased.
  • the average thickness of dielectric layer 2 is more than the above-described upper limit, it may become difficult to apply the substrate to an electronic device that requires flexibility.
  • the term “average thickness” as used herein means an average value obtained by measuring thicknesses at arbitrary ten points.
  • the lower limit of the relative permittivity of dielectric layer 2 is preferably 1.2, is more preferably 1.4, and is further preferably 1.6.
  • the upper limit of the relative permittivity of dielectric layer 2 is preferably 3.0, is more preferably 2.8, and is further preferably 2.5.
  • Copper foil 3 is layered on one surface of dielectric layer 2 as shown in FIG. 1 .
  • a main component of copper foil 3 is copper or a copper alloy. Copper foil 3 can be manufactured by a known method.
  • the “main component” refers to a component having the largest content, such as a component having a content of more than or equal to 50 mass %.
  • the lower limit of the average thickness of copper foil 3 is preferably 1 ⁇ m, is more preferably 5 ⁇ m, and is further preferably 10 ⁇ m.
  • the upper limit of the average thickness is preferably 100 ⁇ m, is more preferably 50 ⁇ m, and is further preferably 20 ⁇ m.
  • the strength of an electric conduction pattern to be formed may be decreased.
  • ease of handling may be decreased.
  • the above-described average thickness is more than the above-described upper limit, the thickness of substrate 1 for a high-frequency printed wiring board may be increased too much.
  • the upper limit of the maximum height roughness (Rz) of the surface of copper foil 3 at the dielectric layer 2 side is 2 ⁇ m, is preferably 1.5 ⁇ m, is more preferably 1 ⁇ m, and is further preferably 0.7 ⁇ m.
  • the lower limit of Rz is preferably 0.05 ⁇ m, is more preferably 0.1 ⁇ m, and is further preferably 0.2 ⁇ m.
  • the adhesive strength between dielectric layer 2 and copper foil 3 can be improved.
  • the adhesive strength between dielectric layer 2 and copper foil 3 can be improved when a ratio (hereinafter, referred to as “atomic ratio (A)”) of the number of the inorganic atoms of the inorganic filler to the number of the fluorine atoms of the fluororesin in a superficial region of dielectric layer 2 at the copper foil 3 side falls within a below-described range.
  • This atomic ratio (A) can be determined by obtaining peaks of the inorganic atoms and the fluorine atoms using energy dispersive X-ray analysis (EDX) and converting the peak areas in accordance with sensitivity of each atom.
  • EDX energy dispersive X-ray analysis
  • the upper limit of the atomic ratio (A) is 0.08, is preferably 0.07, is more preferably 0.05, is further preferably 0.03, and is particularly preferably 0.01.
  • the superficial region at the copper foil 3 side refers to a region in a depth range measured by EDX after detaching copper foil 3 from dielectric layer 2 . This depth range corresponds to a distance of more than or equal to 0 ⁇ m and less than or equal to 0.25 ⁇ m from copper foil 3 when, for example, “FlatQUAD XFlash 5060F” provided by Bruker is used as a measuring device for EDX and an acceleration voltage is set to 5 keV.
  • a small amount of the inorganic filler preferably exists also in the vicinity of the copper foil surface.
  • the lower limit of the atomic ratio (A) is preferably 0.001.
  • the adhesive strength between dielectric layer 2 and copper foil 3 can be improved when a value (hereinafter, referred to as “multiple value (C)”) of multiple of an area ratio (B- 1 ) with respect to an area ratio (B- 2 ) falls within a below-described range, wherein as shown in FIG.
  • the area ratio (B- 1 ) is represented by a ratio (B) of a total cross sectional area of the inorganic filler to an overall cross sectional area in a region (hereinafter, also referred to as “region ( 2 a)”) at a distance of more than or equal to 0 ⁇ m and less than or equal to 2 ⁇ m from the copper foil
  • the area ratio (B- 2 ) is represented by a ratio (B) of a total cross sectional area of the inorganic filler to an overall cross sectional area in a region (hereinafter, also referred to as “region ( 2 c)”) at a distance of more than or equal to 18 ⁇ m and less than or equal to 22 ⁇ m from the copper foil.
  • the upper limit of the multiple value (C) is 0.7, and is preferably 0.5, is more preferably 0.4, is further preferably 0.3, and is particularly preferably 0.2. It should be noted that in order to suppress the permittivity from being changed due to a temperature and suppress the conductivity characteristic, antenna characteristic, and the like of the high-frequency device from being changed, a small amount of the inorganic filler preferably exists also in the vicinity of the copper foil surface.
  • the lower limit of the multiple value (C) is, for example, 0.0 and is preferably 0.01.
  • Each of the respective values of the area ratio (B- 1 ) for the region ( 2 a) and the area ratio (B- 2 ) for the region ( 2 c) is determined, as a value of the ratio of the total cross sectional area of the inorganic filler to the overall cross sectional area, by: using a cross section polisher to obtain a precise polished cross section of dielectric layer 2 in the direction perpendicular to copper foil 3 ; obtaining an image of this cross section using a scanning electron microscope (SEM); and performing a binarization process to each of the regions (the regions ( 2 a) and ( 2 c)) in this SEM image.
  • SEM scanning electron microscope
  • the adhesive strength between dielectric layer 2 and copper foil 3 can be improved when the above-described ratio (B) of the total cross sectional area of the inorganic filler to the overall cross sectional area is gradually decreased from a point at a distance of 20 ⁇ m from the copper foil to a point at a distance of 0 ⁇ m from the copper foil in dielectric layer 2 .
  • the value of the above-described ratio (B) may be decreased linearly or may be decreased curvilinearly as long as the value of the above-described ratio (B) is gradually decreased from the point at the distance of 20 ⁇ m to the point at the distance of 0 ⁇ m.
  • the lower limit of detachment strength of dielectric layer 2 with respect to copper foil 3 is preferably 9 N/cm, is more preferably 10 N/cm, and is further preferably 12 N/cm in peel strength.
  • the upper limit of the above-described detachment strength is 20 N/cm, for example.
  • a substrate 1 ′ for a high-frequency printed wiring board includes: two dielectric layers 2 layered on each other; and two copper foils 3 respectively layered on these dielectric layers 2 .
  • Substrate 1 ′ for a high-frequency printed wiring board normally has the following structure: two substrates 1 for high-frequency printed wiring boards are stacked on each other such that the respective sides of dielectric layers 2 opposite to copper foils 3 face each other.
  • dielectric layer 2 and copper foil 3 are respectively the same as dielectric layer 2 and copper foil 3 in substrate 1 for a high-frequency printed wiring board.
  • a substrate 1 A for a high-frequency printed wiring board includes: a dielectric layer 2 including a layer 2 A and a layer 2 B; and a copper foil 3 layered on layer 2 A.
  • Layer 2 A is a layer that includes a fluororesin and that includes no inorganic filler or a smaller amount of inorganic filler than that in layer 2 B.
  • Layer 2 B is a layer including a fluororesin and an inorganic filler.
  • layer 2 B and copper foil 3 are respectively the same as dielectric layer 2 and copper foil 3 in substrate 1 for a high-frequency printed wiring board.
  • Layer 2 A is the same as dielectric layer 2 of substrate 1 for a high-frequency printed wiring board when dielectric layer 2 of substrate 1 does not include the inorganic filler.
  • a substrate 1 A′ for a high-frequency printed wiring board includes: two dielectric layers 2 each including a layer 2 A and a layer 2 B, dielectric layers 2 being stacked on each other such that respective layers 2 B of dielectric layers 2 face each other; and two copper foils 3 respectively layered on layers 2 A.
  • Substrate 1 A′ for a high-frequency printed wiring board includes: two dielectric layers 2 ; and two copper foils 3 respectively layered on dielectric layers 2 .
  • Substrate 1 A′ for a high-frequency printed wiring board normally has the following structure: two substrates 1 A for high-frequency printed wiring boards are stacked on each other such that layers 2 B of dielectric layers 2 face each other.
  • a substrate 1 B for a high-frequency printed wiring board includes: a dielectric layer 2 ; a copper foil 3 layered on dielectric layer 2 ; and a reinforcement layer 4 layered on a side of dielectric layer 2 opposite to copper foil 3 .
  • reinforcement layer 4 thermal contraction in a plane of the high-frequency printed wiring board can be further suppressed.
  • a reinforcing material of reinforcement layer 4 is not limited particularly as long as the reinforcing material has a linear expansion coefficient smaller than that of dielectric layer 2 , but desirably has: an insulating property; thermal resistance with which the reinforcing material is not melted and does not flow at the melting point of the fluororesin; a tensile strength more than or equal to that of the fluororesin; and corrosion resistance.
  • such a reinforcing material can be composed of: a glass cloth in which glass is formed in the form of a cloth; a fluororesin-containing glass cloth obtained by impregnating such a glass cloth with a fluororesin; a resin cloth including a heat-resistant fiber composed of a metal, a ceramic, polytetrafluoroethylene, polyetheretherketone, polyimide, aramid, or the like; and a heat-resistant film including polytetrafluoroethylene, a liquid crystal polymer, polyimide, polyamide-imide, polybenzimidazole, polyetheretherketone, polytetrafluoroethylene, a tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, a heat-curing resin, a cross-linked resin, or the like.
  • the resin cloth is preferably woven in plain weave in order to obtain thin reinforcement layer 4 , but is preferably woven in twill weave and satin weave in order to obtain bendable dielectric layer
  • a substrate 1 B′ for a high-frequency printed wiring board includes: two reinforcement layers 4 layered on each other; two dielectric layers 2 respectively layered on reinforcement layers 4 ; and two copper foils 3 respectively layered on dielectric layers 2 .
  • Substrate 1 B′ for a high-frequency printed wiring board normally has the following structure: two substrates 1 B for high-frequency printed wiring boards are stacked on each other such that reinforcement layers 4 face each other.
  • Examples of the method for manufacturing substrate 1 for a high-frequency printed wiring board include a first manufacturing method embodiment, a second manufacturing method embodiment, and a third manufacturing method embodiment as described below.
  • composition (I) a step of applying, onto an upper surface of a detachable substrate, a composition (hereinafter, also referred to as “composition (I)”) containing a fluororesin, an inorganic filler, and a dispersion medium;
  • drying step of drying the applied layer formed through the first application step
  • the detachable substrate may be, for example, a metal plate, a ceramic plate, or the like as long as the detachable substrate has a small strength of adhesion with the applied layer.
  • a reinforcing material such as the above-described glass cloth may be inserted between the dielectric layers in order to form a reinforcement layer.
  • the reinforcing material such as the glass cloth may be used instead of the detachable substrate, or a layered body of the reinforcement layer and the applied layer may be formed by forming the applied layer on the reinforcing material provided on the detachable substrate.
  • the manufacturing method in the first manufacturing method embodiment by settling down the inorganic filler in the applied layer in the drying step, the atomic ratio (A) in the superficial region of dielectric layer 2 at the copper foil 3 side and the multiple value (C) in dielectric layer 2 can be adjusted to be values in the above-described ranges. Moreover, a degree of settling-down of the inorganic filler can be controlled by adjusting the length of a time of the drying step and by providing a resting step before the drying step.
  • drying step of drying the applied layer after the above-described reversing step.
  • the manufacturing method in the second manufacturing method embodiment by settling down the inorganic filler in the applied layer in the drying step after performing the reversing step, the atomic ratio (A) in the superficial region of dielectric layer 2 at the copper foil 3 side and the multiple value (C) in dielectric layer 2 can be adjusted to be values in the above-described ranges.
  • composition (H) a composition containing a fluororesin and a dispersion medium
  • drying step of drying the applied layer formed through the above-described third application step
  • composition (II) applied in the third application step may be the same as the composition (I) used in the fourth application step, or may be a composition having an inorganic filler content ratio smaller than that of the composition used in the fourth application step.
  • the atomic ratio (A) in the superficial region of dielectric layer 2 at the copper foil 3 side and the multiple value (C) in dielectric layer 2 can be values in the above-described ranges.
  • the composition (I) is applied onto the upper surface of the substrate.
  • the composition (I) is a composition containing a fluororesin, an inorganic filler, and a dispersion medium.
  • the above-described fluororesin and inorganic filler included in the dielectric layer of the substrate for a high-frequency printed wiring board can be used.
  • the fluororesin is used normally in the form of fine particles.
  • the lower limit of the average particle size of the fluororesin is preferably 0.1 ⁇ m, and is more preferably 1 ⁇ m.
  • the upper limit of the average particle size of the fluororesin is preferably 150 ⁇ m, and is more preferably 100 ⁇ m.
  • the dispersion medium is not limited particularly and various organic solvents, oils, lubricants, and the like can be used.
  • the dispersion medium in view of viscosity, polarity, volatilization temperature, volatilization rate, and the like, film formation and dispersibility of the inorganic filler can be suitably controlled, whereby the substrate for a high-frequency printed wiring board can be manufactured more readily.
  • dispersion medium examples include:
  • a ketone such as methyl ethyl ketone, 2-heptanone, or cyclohexanone
  • hydrocarbon such as hexane, octane, cyclohexane, or ethylcyclohexane
  • a diol such as ethylene glycol, diethylene glycol, propylene glycol, or dipropylene glycol
  • a diol monoester such as ethylene glycol monoacetate, propylene glycol monoacetate, diethylene glycol monoacetate, or dipropylene glycol monoacetate;
  • a diol monoether monoester such as ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, propylene glycol monomethyl ether acetate, or propylene glycol monoethyl ether acetate;
  • a diol diether such as diethylene glycol diethyl ether
  • a diol diester such as propylene glycol diacetate
  • a diol monoether such as propylene glycol monomethyl ether
  • a carboxylate such as cyclohexyl acetate, ethyl lactate, or butyl acetate
  • the diol is preferable and the dipropylene glycol is more preferable in view of dispersibility of the fluororesin and the inorganic filler and the setting-down of the inorganic filler.
  • the substrate to which the composition (I) is applied is not limited particularly, and there can be used the glass cloth described as the reinforcing material included in the dielectric layer of the substrate for a high-frequency printed wiring board, for example.
  • a method for mixing and applying the fluororesin, the inorganic filler, and the dispersion medium is not limited particularly. Examples thereof include: a method for forming a sheet-like applied layer by performing mixing and extrusion using a blender such as a Patterson Kelly Vee Blender.
  • the composition (I) is applied to the upper surface of the copper foil.
  • the copper foil there can be used the copper foil described as the copper foil of the substrate for a high-frequency printed wiring board.
  • the composition (I) is the same as that described with regard to the first application step.
  • Examples of the application method includes: the method described with regard to the first application step; and the like.
  • the composition (II) is applied to the upper surface of the copper foil.
  • composition (II) is a composition containing a fluororesin and a dispersant.
  • the fluororesin there can be used the fluororesin described as the fluororesin included in the dielectric layer of the substrate for a high-frequency printed wiring board.
  • the dispersant there can be used the dispersant described as the dispersant included in the composition (I).
  • the copper foil there can be used the copper foil described as the copper foil of the substrate for a high-frequency printed wiring board.
  • Examples of the application method include: the method described with regard to the first application step; and the like.
  • the upper limit of the average thickness of the applied layer in the third application step is preferably 6 ⁇ m, and is more preferably 3 ⁇ m.
  • the lower limit of the average thickness of the applied layer is preferably 0.01 ⁇ m, and is more preferably 0.1 ⁇ m.
  • the composition (I) is applied to the upper surface of the applied layer after the drying step.
  • the resting step can be performed before the drying step.
  • the inorganic filler is more settled down in the composition of the applied layer, whereby the ratio of the inorganic filler/the fluororesin becomes small in the upper portion of the applied layer.
  • the applied layer is reversed to be upside down.
  • the reversing step is normally performed by reversing the front side and back side of the layered body including the applied layer. On this occasion, in order to prevent falling of the applied layer, it is desirable to cover it with the reinforcing material such as the glass cloth.
  • the applied layer is dried. Moreover, the fluororesin is melted to form a layer including the fluororesin and the inorganic filler or a layer including the fluororesin. In the layer including the fluororesin and the inorganic filler, a ratio of the inorganic filler/the fluororesin is small at the upper portion of the layer.
  • the drying step is performed by, for example, performing heating at more than or equal to 300° C. and less than or equal to 350° C. under a normal pressure or reduced pressure so as to remove the dispersion medium and melt the fluororesin.
  • the copper foil is layered on the upper surface of the applied layer.
  • Examples of a layering method include a method for placing the copper foil on the upper surface of the applied layer after the drying step and performing heat press; and the like.
  • the layering step two applied layers after the drying step are arranged such that respective substrate sides thereof face each other, the copper foils are placed on the upper surface and lower surface of the resulting layered body, and heat press is performed, thereby manufacturing substrate 1 A for a high-frequency printed wiring board as shown in FIG. 2 .
  • the substrate for a high-frequency printed wiring board allows for an improved adhesive strength between the dielectric layer and the copper foil, and allows for an excellent high-frequency characteristic of a printed wiring board, whereby the substrate for a high-frequency printed wiring board can be used suitably as a substrate member of a high-frequency device.
  • the substrate for a high-frequency printed wiring board includes reinforcement layer 4 layered on insulation layer 2 ; however, this reinforcement layer 4 may be provided at a location other than insulation layer 2 , and may be provided in insulation layer 2 , for example.
  • the substrate for a high-frequency printed wiring board may include another layer such as a flexible layer in addition to reinforcement layer 4 .
  • composition (I) containing the fluororesin, the inorganic filler and the dispersion medium
  • composition (II) containing the fluororesin and the dispersion medium
  • FEP (“NC-1500” provided by Daikin Industries)
  • silica filler (“FB3SDC” provided by Denka)
  • Dispersion medium dipropylene glycol (provided by Tokyo Kasei Kogyo)
  • Copper foil electrolytic copper foil (Rz: 0.6 ⁇ m; average thickness: 18 ⁇ m)
  • composition (I) 140 parts by mass of the silica filler was added to 100 parts by mass of the FEP, and 160 parts by mass of the dipropylene glycol was further added to obtain slurry, thereby preparing the composition (I).
  • a substrate for a high-frequency printed wiring board as shown in No. 1 of Table 1 was manufactured as follows. First, the composition (I) was applied onto a glass cloth and was dried, thereby forming a dielectric layer having an average thickness of 50 ⁇ m. Next, two bodies in each of which a copper foil was placed on the upper side of the dielectric layer were prepared, were arranged such that respective surfaces thereof at the glass cloth sides faced each other, and were then subjected to heat press, thereby manufacturing the substrate (No. 1) for a high-frequency printed wiring board.
  • a substrate for a high-frequency printed wiring board as shown in No. 2 of Table 1 was manufactured as follows. First, the composition (I) was applied onto a copper foil, a glass cloth was placed on the upper surface of the formed applied layer, and the applied layer was then reversed to be upside down and was dried, thereby producing a layered body including a dielectric layer having an average thickness of 50 ⁇ m and the copper foil. Next, two such layered bodies were produced, were arranged such that respective surfaces thereof at the glass cloth sides faced each other, and were then subjected to heat press, thereby manufacturing the substrate (No. 2) for a high-frequency printed wiring board.
  • a substrate for a high-frequency printed wiring board as shown in No. 3 of Table 1 was manufactured as follows. First, the composition (II) was applied onto a copper foil and was dried, thereby forming a fluororesin layer having an average thickness of 3 ⁇ m. Next, the composition (I) was applied onto the upper surface of the fluororesin layer and was dried to form a dielectric layer (dielectric layer 2 in FIG. 4 ) having an average thickness of 50 ⁇ m, and a glass cloth was then placed on the upper surface of the composition (I) layer, thereby producing a layered body. Two such layered bodies were produced, were arranged such that respective surfaces thereof at the glass cloth sides faced each other, and were then subjected to heat press, thereby manufacturing the substrate (No. 3) for a high-frequency printed wiring board.
  • a substrate for a high-frequency printed wiring board as shown in No. 4 of Table 1 was manufactured as follows. First, the composition (I) was applied onto a copper foil and was dried, thereby forming a layered body including a dielectric layer having an average thickness of 50 ⁇ m and the copper foil. Two such layered bodies were produced, were arranged such that the dielectric layers thereof faced each other with glass cloths interposed therebetween, and were then subjected to heat press, thereby manufacturing the substrate (No. 4) for a high-frequency printed wiring board.
  • atomic ratio A the number of inorganic atoms/the number of fluorine atoms
  • the adhesive strength 180° peel strength
  • a cross section polisher was used to obtain a precise polished cross section of dielectric layer 2 in the direction perpendicular to copper foil 3 .
  • An image of this cross section was obtained using a scanning electron microscope (SEM).
  • a binarization process was performed to determine respective values (%) (the area ratio (B- 1 ) and the area ratio (B- 2 )) of the ratios (B) of the total cross sectional areas of the inorganic filler to the overall cross sectional areas in the regions.
  • Each of the manufactured substrates for high-frequency printed wiring boards was cut to have a length of 10 cm and a width of 10 cm, thereby producing a test piece for adhesive strength evaluation. 180° peel strength was measured using a tension test device with a detachment rate being set to 50 mm/minute. An adhesive strength of more than or equal to 9 (N/cm) is required.
  • 1 , 1 ′, 1 A, 1 A′, 1 B, 1 B′ substrate for a high-frequency printed wiring board; 2 : dielectric layer; 2 A: layer 2 A, 2 B: layer 2 B; 2 a: region 2 a (at a distance of more than or equal to 0 ⁇ m and less than or equal to 2 ⁇ m from a copper foil); 2 b: region 2 b (at a distance of more than 2 ⁇ m and less than 18 ⁇ m from the copper foil); 2 c: region 2 c (at a distance of more than or equal to 18 ⁇ m and less than or equal to 22 ⁇ m from the copper foil); 2 d: region 2 d (at a distance of more than 22 ⁇ m from the copper foil); 3 : copper foil.

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