WO2018186223A1 - 金属張積層板およびその製造方法 - Google Patents
金属張積層板およびその製造方法 Download PDFInfo
- Publication number
- WO2018186223A1 WO2018186223A1 PCT/JP2018/012222 JP2018012222W WO2018186223A1 WO 2018186223 A1 WO2018186223 A1 WO 2018186223A1 JP 2018012222 W JP2018012222 W JP 2018012222W WO 2018186223 A1 WO2018186223 A1 WO 2018186223A1
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- WO
- WIPO (PCT)
- Prior art keywords
- metal
- liquid crystal
- crystal polymer
- polymer film
- thermoplastic liquid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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- 0 I*1CCCC1 Chemical compound I*1CCCC1 0.000 description 4
- SGVUHPSBDNVHKL-UHFFFAOYSA-N CC1CC(C)CCC1 Chemical compound CC1CC(C)CCC1 SGVUHPSBDNVHKL-UHFFFAOYSA-N 0.000 description 1
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/44—Joining a heated non plastics element to a plastics element
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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
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- B29C66/91921—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges in explicit relation to another variable, e.g. temperature diagrams in explicit relation to another temperature, e.g. to the softening temperature or softening point, to the thermal degradation temperature or to the ambient temperature
- B29C66/91931—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges in explicit relation to another variable, e.g. temperature diagrams in explicit relation to another temperature, e.g. to the softening temperature or softening point, to the thermal degradation temperature or to the ambient temperature in explicit relation to the fusion temperature or melting point of the material of one of the parts to be joined
- B29C66/91935—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges in explicit relation to another variable, e.g. temperature diagrams in explicit relation to another temperature, e.g. to the softening temperature or softening point, to the thermal degradation temperature or to the ambient temperature in explicit relation to the fusion temperature or melting point of the material of one of the parts to be joined lower than said fusion temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/90—Measuring or controlling the joining process
- B29C66/92—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools
- B29C66/929—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools characterized by specific pressure, force, mechanical power or displacement values or ranges
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/0079—Liquid crystals
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
- B29L2031/3425—Printed circuits
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- 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
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
- B32B2037/109—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure using a squeegee
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- 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
- B32B2250/00—Layers arrangement
- B32B2250/02—2 layers
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2255/00—Coating on the layer surface
- B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
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- 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
- B32B2255/00—Coating on the layer surface
- B32B2255/20—Inorganic coating
- B32B2255/205—Metallic coating
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2305/00—Condition, form or state of the layers or laminate
- B32B2305/55—Liquid crystals
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- 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
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- 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/406—Bright, glossy, shiny surface
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- 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/538—Roughness
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- 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/732—Dimensional properties
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- 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
- B32B2398/00—Unspecified macromolecular compounds
- B32B2398/20—Thermoplastics
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- 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
- B32B2457/00—Electrical equipment
- B32B2457/08—PCBs, i.e. printed circuit boards
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
- C08G63/06—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from hydroxycarboxylic acids
- C08G63/065—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from hydroxycarboxylic acids the hydroxy and carboxylic ester groups being bound to aromatic rings
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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
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/01—Dielectrics
- H05K2201/0137—Materials
- H05K2201/0141—Liquid crystal polymer [LCP]
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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
- H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
- H05K2203/15—Position of the PCB during processing
- H05K2203/1545—Continuous processing, i.e. involving rolls moving a band-like or solid carrier along a continuous production path
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/38—Improvement of the adhesion between the insulating substrate and the metal
- H05K3/388—Improvement of the adhesion between the insulating substrate and the metal by the use of a metallic or inorganic thin film adhesion layer
Definitions
- the present invention relates to a metal-clad laminate including a thermoplastic liquid crystal polymer film and a metal layer, and a method for producing the same.
- thermoplastic liquid crystal polymer film has excellent low moisture absorption, heat resistance, chemical resistance and electrical properties derived from the thermoplastic liquid crystal polymer film, and also has excellent dimensional stability. Therefore, it is used as a material for circuit boards such as flexible wiring boards and circuit boards for semiconductor mounting.
- a single-sided metal-clad laminate in which a metal sheet is laminated on one side of a thermoplastic liquid crystal polymer film is used in the form of a microstrip circuit or the like in which circuit formation is performed on the film surface on which the metal sheet is not laminated.
- Demand is increasing.
- Patent Document 1 Japanese Patent Laid-Open No. 2000-343610 describes a single-sided metal-clad laminate obtained by roll-bonding a thermoplastic liquid crystal polymer film and a metal sheet. This document describes that a pair of heat-resistant rubber rolls and heated metal rolls are used when a thermoplastic liquid crystal polymer film and a metal sheet are laminated to form a single-sided metal-clad laminate.
- the single-sided metal-clad laminate obtained in Patent Document 1 uses a heat-resistant rubber roll as a heating roll, so that the heat-resistant rubber roll follows the unevenness of the film, and a uniform lamination of the thermoplastic liquid crystal polymer film and the metal sheet is achieved. As a result, the adhesive strength and dimensional stability between the thermoplastic liquid crystal polymer film and the metal sheet can be improved.
- the lamination temperature becomes 260 ° C. or higher, and when a rubber roll is used, the rubber roll is overheated due to the lamination for a long time. If an overheated rubber roll is used, the peelability between the rubber surface and the film will be reduced, which will cause peeling scratches on the film surface.
- Patent Document 1 has not always been able to sufficiently cope with the transmission characteristics required for a dense circuit pattern such as a microstrip circuit, which has recently been increasing in demand.
- the present inventors firstly (1) formed a metal sheet of a single-sided metal-clad laminate when forming a circuit pattern such as a microstrip or a strip line. It is effective to form a transmission line by vapor deposition, conductive paste, etc. on the non-film side, but in order to further improve the transmission characteristics, the surface state of the film surface of the single-sided metal-clad laminate is It has been found that the circuit characteristics such as transmission characteristics are significantly affected.
- thermoplastic liquid crystal polymer film having a non-metallic luster when the glossiness is used as an index, the surface state of the entire film that has an effect on transmission characteristics, which has been difficult to evaluate by conventional surface roughness. It was understood that can be evaluated accurately.
- a metal elastic roll elastic roll having a metal surface
- a specific surface roughness is used in place of the rubber roll with which the thermoplastic liquid crystal polymer film contacts.
- the smoothness of the metal elastic roll can be transferred to the surface of the thermoplastic liquid crystal polymer film, whereby a specific glossiness can be imparted to the surface of the liquid crystal polymer film, and (4) such glossiness can be imparted to the liquid crystal
- a metal-clad laminate on the surface of a polymer film can form a circuit pattern with excellent transmission characteristics.
- (5) When such a metal elastic roll is used, it is manufactured continuously for a long time using a roll-to-roll method.
- the thermoplastic liquid crystal polymer film Also found to be able to effectively prevent the stick peeling scratched arm surface, and completed the present invention.
- the present invention can be configured in the following manner.
- a metal-clad laminate in which at least a thermoplastic liquid crystal polymer film and a metal sheet are laminated, and the surface of the thermoplastic liquid crystal polymer film opposite to the joint surface with the metal sheet has a glossiness based on JIS Z 8741 (20
- the metal-clad laminate is 55 or more at (°) (preferably 60 or more, more preferably 65 or more).
- a melting point 290 ° C or higher (preferably 300 ° C to 400 ° C, more preferably 315 ° C to 380 ° C).
- the metal-clad laminate according to aspect 1 or 2 further comprising a metal vapor-deposited layer formed on the surface of the thermoplastic liquid crystal polymer.
- Aspect 4 The metal-clad laminate according to any one of aspects 1 to 3, wherein the metal-clad laminate has a length of 100 m or more in the longitudinal direction.
- the circuit pattern is formed on a thermoplastic liquid crystal polymer film surface or a metal vapor deposition layer surface.
- the surface of the thermoplastic liquid crystal polymer film is extremely smooth and has a specific glossiness.
- a dense circuit pattern corresponding to the above can be formed.
- the circuit board which shows the outstanding transmission characteristic can be manufactured.
- the metal-clad laminate can be efficiently manufactured by a roll-to-roll method.
- the operation is performed for a long period of time, not only the occurrence of peeling scratches on the thermoplastic liquid crystal polymer film can be suppressed, but also a specific glossiness can be maintained on the surface of the thermoplastic liquid crystal polymer film.
- One embodiment of the present invention is a method for producing a metal-clad laminate in which a metal sheet is bonded to the surface of a thermoplastic liquid crystal polymer film by a roll-to-roll method.
- the manufacturing method includes preparing a thermoplastic liquid crystal polymer film and a metal sheet, introducing the thermoplastic liquid crystal polymer film and the metal sheet between a pair of heating rolls, and forming the thermoplastic liquid crystal polymer film and the metal sheet. And a step of pressure bonding between the heating rolls.
- FIG. 1 shows a continuous hot press apparatus 10 used in a manufacturing process of a metal-clad laminate according to an embodiment of the present invention.
- the continuous hot press apparatus 10 has a pair of heating rolls 7 each including at least a metal elastic roll 8.
- the pair of heating rolls 7 includes a metal elastic roll 8 and a heating metal roll 9.
- the thermoplastic liquid crystal polymer film 2 is wound from the unwinding roll 22, and the metal sheet 6 is wound from the unwinding roll 21. It is taken out and introduced into a pair of heating rolls 7.
- thermoplastic liquid crystal polymer film 2 is in contact with the metal elastic roll 8, and the thermoplastic liquid crystal polymer film 2 and the metal sheet 6 are at a predetermined temperature and pressure with the metal sheet 6 in contact with the heating metal roll 9. Underneath, thermocompression bonding is performed at a predetermined lamination speed to produce a single-sided metal-clad laminate 19.
- the obtained single-sided metal-clad laminate has a laminated structure in which a metal sheet layer and a thermoplastic liquid crystal polymer film layer are laminated in this order.
- FIG. 2 shows a vapor deposition apparatus used in the manufacturing process of the metal-clad laminate according to one embodiment of the present invention.
- the obtained single-sided metal-clad laminate 19 is introduced from the unwinding roll 12 by the guide roll 15 so that the surface of the metal sheet 6 contacts the vapor deposition heating roll 13.
- the liquid crystal polymer film 2 is introduced in a state in which the liquid crystal polymer film 2 does not contact the vapor deposition heating roll 13 and faces the outside of the vapor deposition heating roll 13.
- a metal vapor deposition layer (copper vapor deposition layer) is formed on the liquid crystal polymer film 2 existing outside the vapor deposition heating roll 13.
- a metal vapor deposition layer is performed by heating a vapor deposition source by irradiating the crucible 17 which has the vapor deposition source arrange
- the double-sided metal-clad laminate 21 on which the metal vapor-deposited layer is formed is guided by the guide roll 16 and taken up by the take-up roll 14.
- the obtained double-sided metal-clad laminate has a laminated structure in which a metal sheet layer, a thermoplastic liquid crystal polymer film layer, and a metal vapor deposition layer are laminated in this order.
- thermoplastic liquid crystal polymer film is formed from a liquid crystal polymer that can be melt-molded.
- the thermoplastic liquid crystal polymer (sometimes simply referred to as a liquid crystal polymer) is not particularly limited as long as it is a liquid crystalline polymer that can be melt-molded.
- a thermoplastic liquid crystal polyester or Examples thereof include a thermoplastic liquid crystal polyester amide having an amide bond introduced therein.
- the thermoplastic liquid crystal polymer may be a polymer in which an aromatic polyester or an aromatic polyester amide is further introduced with an isocyanate-derived bond such as an imide bond, a carbonate bond, a carbodiimide bond, or an isocyanurate bond.
- an isocyanate-derived bond such as an imide bond, a carbonate bond, a carbodiimide bond, or an isocyanurate bond.
- thermoplastic liquid crystal polymer used in the present invention include known thermoplastic liquid crystal polyesters and thermoplastic liquid crystal polyester amides derived from the compounds (1) to (4) listed below and derivatives thereof. Can be mentioned. However, it goes without saying that there is an appropriate range of combinations of various raw material compounds in order to form a polymer capable of forming an optically anisotropic melt phase.
- Aromatic or aliphatic diol (see Table 1 for typical examples)
- Aromatic diamine, aromatic hydroxyamine or aromatic aminocarboxylic acid (see Table 4 for typical examples)
- a polymer containing p-hydroxybenzoic acid and / or 6-hydroxy-2-naphthoic acid as at least a repeating unit is preferable.
- at least one aromatic hydroxycarboxylic acid selected from the group consisting of p-hydroxybenzoic acid and 6-hydroxy-2-naphthoic acid and 4,4 ′ A repeating unit of at least one aromatic diol selected from the group consisting of dihydroxybiphenyl and hydroquinone and at least one aromatic dicarboxylic acid selected from the group consisting of terephthalic acid, isophthalic acid and 2,6-naphthalenedicarboxylic acid Polymers containing are preferred.
- the repeating unit (A) of p-hydroxybenzoic acid is used.
- At least one aromatic hydroxycarboxylic acid (C) selected from the group consisting of p-hydroxybenzoic acid and 6-hydroxy-2-naphthoic acid, and 4,4′-dihydroxy At least one aromatic diol (D) selected from the group consisting of biphenyl and hydroquinone, and at least one aromatic dicarboxylic acid (E) selected from the group consisting of terephthalic acid, isophthalic acid and 2,6-naphthalenedicarboxylic acid.
- optical anisotropy at the time of melting referred to in the present invention can be recognized by, for example, placing a sample on a hot stage, heating and heating in a nitrogen atmosphere, and observing the transmitted light of the sample.
- the thermoplastic liquid crystal polymer preferably has a melting point (hereinafter referred to as M 0 p) in the range of 260 to 360 ° C., and more preferably has a M 0 p of 270 to 350 ° C.
- M 0 p is determined by measuring the temperature of the main endothermic peak appears by differential scanning calorimeter (Shimadzu Corporation DSC).
- the thermoplastic liquid crystal polymer may be a thermoplastic polymer such as polyethylene terephthalate, modified polyethylene terephthalate, polyolefin, polycarbonate, polyarylate, polyamide, polyphenylene sulfide, polyether ether ketone, and fluororesin within a range not impairing the effects of the present invention.
- Various additives may be added, and a filler may be added as necessary.
- thermoplastic liquid crystal polymer film used in the present invention can be obtained by extruding a thermoplastic liquid crystal polymer. Any extrusion molding method can be applied as long as the direction of the rigid rod-like molecules of the thermoplastic liquid crystal polymer can be controlled, but the known T-die method, laminate stretching method, inflation method and the like are industrially advantageous.
- the inflation method and the laminate stretching method stress is applied not only in the film machining direction (hereinafter abbreviated as MD direction) but also in the direction perpendicular thereto (hereinafter abbreviated as TD direction).
- MD direction film machining direction
- TD direction direction perpendicular thereto
- thermoplastic liquid crystal polymer film may be a known or conventional heat treatment to adjust the melting point and / or the thermal expansion coefficient of the thermoplastic liquid crystal polymer film.
- the heat treatment conditions can be appropriately set according to the purpose.
- the melting point (M 0 p) of the thermoplastic liquid crystal polymer is ⁇ 10 ° C. or higher (for example, about M 0 p ⁇ 10 to M 0 p + 30 ° C., preferably M 0 p to M
- the melting point (Tm) of the thermoplastic liquid crystal polymer film may be increased by heating at about 0 p + 20 ° C. for several hours.
- the melting point (Tm) of the thermoplastic liquid crystal polymer film can be selected within the range of about 200 to 400 ° C., preferably about 250 to 360 ° C., for the purpose of obtaining the desired heat resistance and processability of the film. Preferably, it may be about 260 to 340 ° C.
- thermoplastic liquid crystal polymer film preferably has a higher isotropic property, and the molecular orientation degree SOR, which is an index of isotropic property, is 0.8 to 1.4, preferably 0.9 to 1.3, more preferably. Is 1.0 to 1.2, particularly preferably 1.0 to 1.1.
- the molecular orientation SOR (Segment Orientation Ratio) is an index that gives the degree of molecular orientation of the segments that make up the molecule.
- MOR Molecular Orientation Ratio
- the thickness of the object is taken into account. It is the value.
- thermoplastic liquid crystal polymer film used in the present invention is preferably in the range of 10 to 200 ⁇ m, more preferably in the range of 15 to 150 ⁇ m, from the viewpoint of use in a metal-clad laminate. .
- Metal sheet A metal sheet (hereinafter sometimes referred to as a metal foil) is laminated on one side of a thermoplastic liquid crystal polymer film in a metal-clad laminate.
- a material of the metal foil of this invention For example, copper, gold
- the copper foil is not particularly limited as long as it is a copper foil that can be used in a circuit board, and may be a rolled copper foil or an electrolytic copper foil.
- the metal foil may be subjected to chemical treatment such as acid cleaning that is usually applied to the copper foil.
- chemical treatment such as acid cleaning that is usually applied to the copper foil.
- the range of 6 to 200 ⁇ m is preferable, the range of 9 to 40 ⁇ m is more preferable, and the range of 10 to 20 ⁇ m is more preferable. This is because if the thickness is too thin, there is a risk of deformation such as wrinkles in the metal foil in the manufacturing process of the metal-clad laminate, and if the thickness is too thick, for example, when used as a flexible wiring board, the bending performance This is because there is a case in which the lowering may occur.
- the ten-point average roughness Rz may be, for example, 0.1 ⁇ m or more.
- the thickness is 2.0 ⁇ m or less, the metal-clad laminate 1 having good high-frequency characteristics and excellent adhesion strength can be obtained.
- it is more preferably in the range of 0.1 to 1.5 ⁇ m, and more preferably in the range of 0.3 to 1.1 ⁇ m.
- 10-point average roughness Rz shows the value measured by the method described in the Example mentioned later.
- thermo-compression process of thermoplastic liquid crystal polymer film and metal sheet The production method according to the present invention includes a thermocompression bonding process of a thermoplastic liquid crystal polymer film and a metal sheet, and in the thermocompression bonding process, the thermoplastic liquid crystal polymer film and the metal sheet are introduced between a pair of heating rolls, and both are crimped. The process to be made is provided.
- the pair of heating rolls includes a metal elastic roll at least on the side in contact with the thermoplastic liquid crystal polymer film.
- the metal elastic roll is an elastic roll having a metal surface, and the metal surface has a very smooth surface with a ten-point average roughness Rz of 0.2 ⁇ m or less.
- the lower limit value of the ten-point average roughness Rz is not particularly limited, but may be, for example, 0.01 ⁇ m or more.
- the surface follow-up property provided by the metal elastic roll can be suppressed.
- the shape of the specific surface roughness formed on the metal surface can be reflected in the thermoplastic liquid crystal polymer film. As a result, it is possible to give a specific glossiness to the surface of the thermoplastic liquid crystal polymer film of the metal-clad laminate.
- the heat dissipation of the roll surface temperature can be increased due to the metal surface, so that even when high-temperature pressure bonding is continued for a long time, it can be peeled off from the thermoplastic liquid crystal polymer film. Therefore, it is possible to suppress the occurrence of peeling scratches such as peeling wrinkles on the surface of the thermoplastic liquid crystal polymer film.
- the metal elastic roll is not particularly limited as long as the surface is an elastic roll having a specific smooth metal surface, but from the viewpoint of improving transferability, it is preferably formed in the form of a roll-shaped heat resistant rubber and its surroundings.
- the metal elastic roll (henceforth a metal rubber roll) comprised with the metal surface layer may be sufficient.
- the rubber roll portion may have a rubber hardness of about 70 to 100, and preferably a rubber hardness of about 75 to 90, from the viewpoint of improving the press-bonding property during thermocompression bonding.
- the rubber hardness is a value obtained by a test using an A-type spring type hardness tester based on JIS K 6301.
- a rubber having a hardness of 70 or more can be obtained by adding a vulcanization accelerator such as a vulcanizing agent or an alkaline substance to a synthetic rubber such as silicone rubber or fluorine rubber or natural rubber.
- the thickness of the metal surface layer of the metal rubber roll may be, for example, 100 to 1000 ⁇ m, preferably 150 to 800 ⁇ m, more preferably 200 to 500 ⁇ m.
- the metal surface layer is formed of a metal having excellent heat resistance and rigidity (for example, nickel, stainless steel, etc.), and may be a cylindrical plating layer according to the thickness or material, or a cylinder formed by processing a metal plate. It may be a shape.
- the roll on the side in contact with the metal sheet can be appropriately selected according to the heating means.
- the heat treatment means for example, a hot air type heat treatment furnace, a hot air circulating dryer, a hot roll, a ceramic heater, a heat treatment apparatus using IR (far infrared rays), or a method using these in combination can be used.
- the heating means is a heating means from the outside, a metal roll, a metal elastic roll, a heat-resistant rubber roll, etc. may be mentioned.
- a heating means is internal heating, an internal heating type metal roll (heating metal roll) is preferably used.
- the laminating temperature can be appropriately set according to the melting point (Tm) of the thermoplastic liquid crystal polymer film, for example, 40 ° C. lower than the melting point (Tm) and 5 ° C. lower than the melting point
- the temperature may be in the range of Tm-40 ° C to Tm-5 ° C, preferably in the range of Tm-35 ° C to Tm-7 ° C, more preferably in the range of Tm-30 ° C to Tm-10 ° C. May be.
- the pressure at the time of laminating with a pair of heating rolls is, for example, about 15 to 70 kg / cm 2 , preferably 20 to 60 kg / cm 2 as the surface pressure from the viewpoint of giving good gloss to the thermoplastic liquid crystal polymer film. It may be about 2 , preferably about 25 to 55 kg / cm 2 .
- thermoplastic liquid crystal polymer film and the single-sided metal-clad laminate of metal sheets joined by a heating roll may be further subjected to heat treatment in order to improve the interlayer adhesion between them.
- the heat treatment means for example, a hot air type heat treatment furnace, a hot air circulation dryer, a hot roll, a ceramic heater, a heat treatment apparatus using IR (far infrared), or a method using these in combination can be used. Further, from the viewpoint of preventing oxidation of the surface of the metal sheet, it is preferable to use a heated nitrogen gas and perform heat treatment in an inert atmosphere with an oxygen concentration of 0.1% or less.
- the heat treatment may be performed under tension or under tension, but is preferably performed under tension.
- the heat treatment temperature Ta (° C.) may be higher than the melting point Tm (° C.) of the thermoplastic liquid crystal polymer film (Tm ⁇ Ta), preferably Tm (Tm + 1 ⁇ Ta ⁇ Tm + 50), more preferably 1 ° C or more and 30 ° C or less higher temperature (Tm + 1 ⁇ Ta ⁇ Tm + 30), more preferably 2 ° C or more and 20 ° C.
- Tm ⁇ Ta ⁇ Tm + 20 the melting point of the thermoplastic liquid crystal polymer film
- the heat treatment time at a predetermined heat treatment temperature Ta is preferably 1 second to 10 minutes, more preferably 5 seconds to It is 8 minutes, more preferably 8 seconds to 5 minutes, and particularly preferably 8 seconds to 3 minutes.
- the production method according to the present invention may further include a metal vapor deposition step of vapor-depositing metal on the surface of the thermoplastic liquid crystal polymer film of the single-sided metal-clad laminate.
- the metal vapor deposition step is also preferably performed by a roll-to-roll method. In that case, in the vapor deposition chamber, the single-sided metal-clad laminate is introduced into the vapor deposition heating roll so that the metal sheet surface of the single-sided metal-clad laminate is in contact with the vapor deposition heating roll, A metal vapor deposition layer is formed on the surface of the thermoplastic liquid crystal polymer film.
- Metal vapor deposition is performed, for example, by vacuum vapor deposition, and the heating mode includes, for example, resistance heating, electron beam heating, high-frequency heating, and the like.
- a deposition source for example, a metal such as copper, gold, silver, nickel, aluminum, and stainless steel, preferably copper, particularly preferably a purity of 99
- a vapor deposition boat (made of tungsten or molybdenum, which is a resistor), is placed.
- the metal is vapor-deposited on the surface of the thermoplastic liquid crystal polymer film, and a metal vapor deposition layer is formed on the surface of the thermoplastic liquid crystal polymer film in the single-sided metal-clad laminate. can do.
- thermoplastic liquid crystal polymer film when using electron beam heating, deposit a metal on the surface of the thermoplastic liquid crystal polymer film by placing the deposition source in a crucible in a vacuum atmosphere and irradiating the crucible with an electron beam to heat the deposition source. And a metal vapor deposition layer can be formed in the surface of the thermoplastic liquid crystal polymer film in a single-sided metal-clad laminate, and a double-sided metal-clad laminate can be obtained.
- the surface temperature of the vapor deposition heating roll is higher than the thermal deformation temperature (Tdef) of the thermoplastic liquid crystal polymer film from the viewpoint of improving the adhesion between the thermoplastic liquid crystal polymer film and the metal vapor deposition layer. It is preferable that it is below melting
- the surface temperature of the vapor deposition heating roll may be Tm-65 ° C. to Tm-0.5 ° C., preferably Tm-55 ° C. to Tm— 1 ° C., more preferably Tm-45 ° C.
- thermoplastic liquid crystal polymer film If vapor deposition is performed at a temperature higher than the heat distortion temperature of the thermoplastic liquid crystal polymer film, the vapor deposition particles (particles scattered during the vapor deposition) will sink into the film that has been softened by heating, or a thermoplastic liquid crystal having an extremely smooth surface. A metal vapor deposition layer having good adhesion can also be formed on the polymer film.
- the deposition rate it is preferable to set the deposition rate to 1 nm / s or more and 5 nm / s or less from the viewpoint of improving productivity in the roll-to-roll method.
- thermoplastic liquid crystal polymer film 2 in the roll-to-roll method it is preferable to set the moving speed of the thermoplastic liquid crystal polymer film 2 in the roll-to-roll method to 0.1 m / min to 5 m / min.
- the metal-clad laminate according to one aspect of the present invention is a metal-clad laminate in which at least a thermoplastic liquid crystal polymer film and a metal sheet are laminated, and the thermoplastic liquid crystal polymer on the side opposite to the joint surface with the metal sheet
- the film surface is a metal-clad laminate having a glossiness (20 °) of 55 or more based on JIS Z 8741.
- the metal-clad laminate has a metal vapor deposition layer on the surface of the thermoplastic liquid crystal polymer film having the glossiness, the glossiness of the surface of the thermoplastic liquid crystal polymer film is reduced by etching and removing the metal vapor deposition layer. You may check.
- the metal-clad laminate is derived from a specific manufacturing method, and the surface of the thermoplastic liquid crystal polymer film is extremely smooth. Therefore, the glossiness (20 °) based on JIS Z 8741-1997 is 55 or more. Become.
- the upper limit of the glossiness (20 °) on the surface of the thermoplastic liquid crystal polymer film is not particularly limited, but may usually be 200 or less.
- thermoplastic liquid crystal polymer film having a non-metallic luster
- the present inventors accurately evaluate the surface state of the film that affects the transmission characteristics depending on the glossiness. Clarified that you can. That is, in the thermoplastic liquid crystal polymer film, the surface roughness measured in a fine range cannot accurately evaluate the overall smoothness of the film surface, while the glossiness measured in a macroscopic range, Since it is possible to evaluate the overall smoothness of the film surface, it is presumed that the glossiness can be used as an evaluation standard for transmission characteristics.
- the glossiness (20 °) of the surface of the thermoplastic liquid crystal polymer film is preferably 60 or more (for example, 60 to 120), more preferably 65 or more (for example, 65 to 100).
- the glossiness (20 °) indicates a value measured by the method described in Examples described later.
- the gloss (20 °) of the surface of the thermoplastic liquid crystal polymer film is not easily lowered even when the roll-to-roll system is continuously operated, for example, when the roll-to-roll system is continuously operated for 60 minutes.
- the gloss retention on the surface of the thermoplastic liquid crystal polymer film may be 95% or more (for example, 95 to 105%), preferably 97% or more (for example, 95 to 103%).
- the glossiness retention rate in the case of continuous operation for 60 minutes can be calculated by the following equation.
- Glossiness retention rate (Glossiness after 60 minutes continuous operation / Glossiness immediately after operation) ⁇ 100
- glossiness immediately after operation is the glossiness of the surface of the thermoplastic liquid crystal polymer film of the laminate sample obtained immediately after the operation by the roll-to-roll method is started.
- glossiness is the glossiness of the thermoplastic liquid crystal polymer film surface of the laminate sample obtained after 60 minutes of continuous operation.
- a single-sided metal-clad laminate can be formed without forming peeling scratches even with a high-melting-point thermoplastic liquid crystal polymer film, which is difficult to produce by a conventional roll-to-roll method.
- the melting point of such a high melting point film may be, for example, 290 ° C. or higher (for example, 300 ° C. to 400 ° C.), preferably 315 ° C. to 380 ° C.
- the double-sided metal-clad laminate provided with a metal vapor-deposited layer formed on the surface of the thermoplastic liquid crystal polymer can exhibit excellent transmission characteristics due to the smoothness of the surface of the thermoplastic liquid crystal polymer film.
- the thickness of the metal vapor deposition layer may be, for example, 0.05 ⁇ m to 1.0 ⁇ m, more preferably 0.1 ⁇ m to 0.8 ⁇ m.
- the metal-clad laminate according to the present invention is formed by a roll-to-roll method, unlike a metal-clad laminate formed by a batch press method, a large-sized metal-clad laminate can be efficiently produced.
- the metal-clad laminate may have a length of 100 m or more in the longitudinal direction.
- the circuit board which is one embodiment of the present invention is a circuit board in which a circuit surface is formed on the metal-clad laminate.
- the circuit surface can be formed by a known subtractive method, additive method, semi-additive method, or the like.
- the thickness of the circuit (metal layer) may be, for example, 10 to 14 ⁇ m, and preferably 11 to 13 ⁇ m.
- the circuit surface may preferably be formed on the thermoplastic liquid crystal polymer film surface or the metal vapor deposition layer surface. Alternatively, a metal plating layer may be further formed on the metal vapor deposition layer, and a circuit surface may be formed on the metal plating surface.
- the circuit board may have through holes or the like formed by various known or commonly used manufacturing methods as required.
- a through-hole plating layer may be formed on the circuit board, and the thickness of the circuit (metal layer) in a state where the through-hole plating layer is formed may be, for example, 20 to 40 ⁇ m. Preferably, it may be 25 to 35 ⁇ m.
- a high-frequency circuit is not only a circuit that transmits only a high-frequency signal, but also a transmission path that converts a high-frequency signal to a low-frequency signal and outputs the generated low-frequency signal to the outside, or a component that supports high-frequency signals.
- a transmission line for transmitting a signal that is not a high-frequency signal such as a transmission line for supplying power supplied for driving, is also included.
- the dielectric constant was measured by a resonance perturbation method at a frequency of 10 GHz.
- a probe compatible with 40 to 67 GHz was connected to a microwave network analyzer (manufactured by Agilent), and transmission loss was measured at 40 GHz and 60 GHz.
- ten-point average roughness was measured using a contact-type surface roughness meter (manufactured by Mitutoyo Corporation, model: SJ-201) according to JIS B0601: 1994. More specifically, the ten-point average roughness (Rz) is obtained by extracting the reference length from the roughness curve in the direction of the average line, and calculating the average value of the altitudes of the highest to fifth peaks (convex vertices). The difference from the average value of the altitude of the valley bottom (concave bottom point) from the deepest to the fifth is expressed in ⁇ m.
- the melting point was obtained by observing the thermal behavior of the film using a differential scanning calorimeter. That is, the temperature of the produced film was raised at a rate of 20 ° C./min and completely melted, and then the melt was rapidly cooled to 50 ° C. at a rate of 50 ° C./min, and again at a rate of 20 ° C./min. The position of the endothermic peak that appears when the temperature was raised was taken as the melting point of the thermoplastic liquid crystal polymer film.
- the melting point was obtained by observing the thermal behavior of the film using a thermomechanical analyzer. That is, the produced film was used as a test piece having a width of 5 mm and a length of 20 mm, and the thermal expansion amount in the length direction of the test piece under conditions of a tensile load of 0.01 N and a heating rate of 10 ° C./min at a distance between chucks of 15 mm. was measured and the inflection point was defined as the thermal deformation temperature of the thermoplastic liquid crystal polymer film.
- thermoplastic liquid crystal polymer film A thermotropic liquid crystal polyester composed of 6-hydroxy-2-naphthoic acid units (27 mol%) and p-hydroxybenzoic acid units (73 mol%) was used using a single screw extruder. The mixture was heated and kneaded at 280 to 300 ° C. and then extruded from an inflation die having a diameter of 40 mm and a slit interval of 0.6 mm to obtain a thermoplastic liquid crystal polymer film having a thickness of 50 ⁇ m. The thermoplastic liquid crystal polymer film had a melting point Tm of 282 ° C. and a heat distortion temperature Tdef of 230 ° C.
- thermoplastic liquid crystal polymer film prepared in the above (1) and a rolled copper foil having a thickness of 12 ⁇ m manufactured by JX Nippon Mining & Metals, trade name: BHYX-HA-V2, Rz: 0.9 ⁇ m
- the thermoplastic liquid crystal polymer film 2 and the metal sheet 6 were prepared.
- a metal elastic roll 8 and a heated metal roll 9 are attached to the continuous hot roll press apparatus 10 as the heating roll 7 for lamination, respectively, and the thermoplastic liquid crystal polymer film 2 is attached to the metal elastic roll 8 side. It introduced so that the metal sheet 6 might contact the side, and the thermoplastic liquid crystal polymer film 2 and the metal sheet 6 were thermocompression bonded, and the single-sided metal-clad laminate 19 was produced.
- the metal elastic roll 8 has a metal band having a thickness of 380 ⁇ m attached to the outer periphery of a heat-resistant rubber roll having a hardness of 90 degrees, and the metal surface of the metal elastic roll has a ten-point surface roughness Rz: 0.2 ⁇ m or less.
- the surface temperature of the heated metal roll 9 is 270 ° C.
- the pressure applied to the thermoplastic liquid crystal polymer film and the copper foil between the heat-resistant rubber roll and the heated metal roll is 40 kg / cm 2 in terms of surface pressure.
- the lamination speed is 3 m / min. Under this condition, the thermoplastic liquid crystal polymer film was moved along the heat-resistant rubber roll, and then the copper foil was joined to the thermoplastic liquid crystal polymer film to obtain a laminate.
- the winding tension is released on the line by a nip roll, and the produced laminate is heated by IR. Processed.
- the temperature is gradually raised from 150 ° C. in the heat treatment furnace, and the heat treatment time in the heat treatment apparatus (that is, the time required for any one point of the laminated plate to pass the predetermined heat treatment temperature) is Tm + 5 ° C. ( (Tm: film melting point) was set to pass in 10 seconds, and heat treatment was performed.
- thermoplastic liquid crystal polymer film surface was visually observed, and the glossiness of the thermoplastic liquid crystal polymer film surface was measured. The results are shown in Table 7.
- the single-sided metal-clad laminate 19 was set on the loader side, the open window was completely closed, and evacuation was performed. At the same time, the temperature of the evaporation heating roll 13 was set to 100 ° C.
- the copper ingot was taken out, and copper pellets were added so that the total weight of copper was 450 g.
- the copper pellet was washed with sodium persulfate water as a pretreatment, and then washed with distilled water.
- the set temperature of the vapor deposition heating roll 13 was set to (Tm ⁇ 15) ° C. (Tm: film melting point). Thereafter, the output of EMI (emission current value) of the electron gun 18 was increased, and the copper in the crucible 17 was melted. At this time, the EMI output value was adjusted so that the vapor deposition rate was 2.7 nm / s.
- the single-sided metal With the conveying speed of the tension laminate 19 set to 0.5 m / min, a copper deposition process was performed to form a copper deposition layer having a thickness of 0.3 ⁇ m, and a double-sided metal tension laminate 21 was obtained.
- a linear conductor foil is formed on the surface of a plate-like dielectric substrate having a conductor foil formed on the back surface.
- a 50 ⁇ transmission path (microstrip line) for transmitting electromagnetic waves was produced.
- the metal vapor-deposited surface of the double-sided metal-clad laminate 21 was used as a seed layer, a resist pattern was formed thereon, and electrolytic copper plating was performed to grow a circuit. Thereafter, the resist was removed, and the seed layer between the circuits was etched to form a circuit pattern having a thickness of 12 ⁇ m.
- a microstrip circuit board having a circuit thickness of 30 ⁇ m was produced, and its transmission characteristics were measured. The results obtained are shown in Table 7.
- thermoplastic liquid crystal polymer film A thermotropic liquid crystal polyester composed of 6-hydroxy-2-naphthoic acid units (20 mol%) and p-hydroxybenzoic acid units (80 mol%) was used using a single screw extruder. The mixture was heated and kneaded at 350 ° C. and then extruded from an inflation die having a diameter of 40 mm and a slit interval of 0.6 mm to obtain a thermoplastic liquid crystal polymer film having a thickness of 50 ⁇ m. The thermoplastic liquid crystal polymer film had a melting point Tm of 325 ° C. and a heat distortion temperature Tdef of 310 ° C.
- thermoplastic liquid crystal polymer film obtained in (1) above is used as the thermoplastic liquid crystal polymer film, and the surface temperature of the heated metal roll 5 is 300 ° C.
- a metal-clad laminate was produced. Thereafter, a double-sided metal-clad laminate and a microstrip circuit board were obtained in the same manner as in Example 1 except that the set temperature of the heating roll 13 for vapor deposition was (Tm-15) ° C. (Tm: film melting point).
- Tm-15 set temperature of the heating roll 13 for vapor deposition
- Examples 3 and 4 For the single-sided metal-clad laminates of Examples 1 and 2, respectively, except that a single-sided metal-clad laminate produced immediately after the start of operation was used instead of the single-sided metal-clad laminate obtained 60 minutes after the start of operation. In the same manner as in Examples 1 and 2, a double-sided metal-clad laminate and a microstrip circuit board were obtained. Various physical properties are shown in Table 7.
- Comparative Examples 3 and 4 when the heat resistant rubber roll is used, the fine streaks formed on the surface of the rubber roll are transferred, so that the gloss of the liquid crystal polymer film surface can be obtained even immediately after the start of operation.
- the degree is inferior to that of Examples 1 and 2.
- Comparative Examples 3 and 4 the transmission loss is inferior to that of the Example.
- the glossiness retention after 60 minutes of continuous operation is 77% and 92% in Comparative Examples 1 and 2, and the glossiness is remarkably lowered as compared with Examples 1 and 2.
- the present invention it is possible to obtain a metal-clad laminate having a glossy surface on the surface of the liquid crystal polymer film that is unprecedented. And from such a metal-clad laminated board, the circuit board which has the outstanding transmission characteristic can be provided.
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Abstract
Description
本発明の別の目的は、良好な伝送特性を達成できる金属張積層板を提供することにある。
本発明のさらに別の目的は、ロールツーロール方式で連続的に長時間製造した場合であっても、熱可塑性液晶ポリマーフィルム表面の表面平滑性に優れる金属張積層板を効率よく製造する製造方法を提供することにある。
〔態様1〕
熱可塑性液晶ポリマーフィルムと金属シートとが少なくとも積層された金属張積層板であって、金属シートとの接合面とは反対側の熱可塑性液晶ポリマーフィルム表面が、JIS Z 8741に基づく光沢度(20°)において55以上(好ましくは60以上、より好ましくは65以上)である、金属張積層板。
〔態様2〕
態様1に記載の金属張積層板であって、熱可塑性液晶ポリマーフィルムの融点が290℃以上(好ましくは300℃~400℃、より好ましくは315℃~380℃)である、金属張積層板。
〔態様3〕
態様1または2に記載の金属張積層板であって、さらに、前記熱可塑性液晶ポリマー表面に形成された金属蒸着層を備える、金属張積層板。
〔態様4〕
態様1~3のいずれか一態様に記載の金属張積層板であって、長手方向において、100m以上の長さを有する、金属張積層板。
〔態様5〕
ロールツーロール方式により、熱可塑性液晶ポリマーフィルムの表面に金属シートが接合された金属張積層板の製造方法であって、
熱可塑性液晶ポリマーフィルムと金属シートとを準備する工程と、
前記熱可塑性液晶ポリマーフィルムと前記金属シートとを一対の加熱ロール間に導入し、前記熱可塑性液晶ポリマーフィルムと前記金属シートとを前記一対の加熱ロール間で圧着させる工程と、
を少なくとも備え、
前記一対の加熱ロールは、前記熱可塑性液晶ポリマーフィルムと接する側に金属弾性ロールを少なくとも備え、前記金属弾性ロールは、表面の十点平均粗さRzが0.2μm以下(例えば、0.01~0.2μm)である、金属張積層板の製造方法。
〔態様6〕
態様5に記載の金属張積層板の製造方法において、前記一対の加熱ロールが、金属ロールと金属弾性ロールで構成される、金属張積層板の製造方法。
〔態様7〕
態様6に記載の金属張積層板の製造方法において、前記金属ロールが、内部加熱式の金属ロールである、金属張積層板の製造方法。
〔態様8〕
態様5~7のいずれか一態様に記載の金属張積層板の製造方法において、前記金属弾性ロールが、ロール状の耐熱性ゴムと、その周囲に形成された金属表面層とで構成されている、金属張積層板の製造方法。
〔態様9〕
態様8に記載の金属張積層板の製造方法において、前記耐熱性ゴムの硬度が70~100であり、金属表面層の厚みが100~1000μmである、金属張積層板の製造方法。
〔態様10〕
態様1~4のいずれか一態様に記載の金属張積層板に、回路面が形成されている、回路基板。
〔態様11〕
態様10に記載の回路基板であって、前記回路パターンが、熱可塑性液晶ポリマーフィルム表面または金属蒸着層表面に形成されている、回路基板。
本発明の一実施形態は、ロールツーロール方式により、熱可塑性液晶ポリマーフィルムの表面に金属シートが接合された金属張積層板の製造方法である。前記製造方法は、熱可塑性液晶ポリマーフィルムと金属シートとを準備する工程と、前記熱可塑性液晶ポリマーフィルムおよび前記金属シートを一対の加熱ロール間に導入し、前記熱可塑性液晶ポリマーフィルムおよび前記金属シートを加熱ロール間で圧着させる工程と、を少なくとも含んでいる。
熱可塑性液晶ポリマーフィルムは、溶融成形できる液晶性ポリマーから形成される。この熱可塑性液晶ポリマー(単に液晶ポリマーと称する場合がある)は、溶融成形できる液晶性ポリマーであれば特にその化学的構成については特に限定されるものではないが、例えば、熱可塑性液晶ポリエステル、又はこれにアミド結合が導入された熱可塑性液晶ポリエステルアミドなどを挙げることができる。
金属シート(以下、金属箔と称する場合もある。)は、金属張積層板において、熱可塑性液晶ポリマーフィルムの片面に積層される。本発明の金属箔の材料としては、特に制限はなく、例えば、銅、金、銀、ニッケル、アルミニウム、及びステンレスなどを挙げることができ、導電性、取り扱い性、及びコスト等の観点から、銅箔やステンレス箔を使用することが好ましく、特に銅箔が好ましく用いられる。銅箔は、回路基板において用い得る銅箔であれば、特に限定されず、圧延銅箔、電解銅箔のいずれであってもよい。
本発明にかかる製造方法は、熱可塑性液晶ポリマーフィルムおよび金属シートの熱圧着工程を備え、前記熱圧着工程では、熱可塑性液晶ポリマーフィルムおよび金属シートを一対の加熱ロール間に導入し、両者を圧着させる工程を備えている。
また、所定の熱処理温度Taでの熱処理時間(ロールツーロール方式の場合は、任意の1点が、熱処理温度Taを通過する時間)は、1秒~10分が好ましく、より好ましくは5秒~8分であり、さらに好ましくは8秒~5分であってもよく、特に好ましくは8秒~3分である。
本発明にかかる製造方法は、さらに、片面金属張積層板の熱可塑性液晶ポリマーフィルム表面に対して、金属を蒸着させる金属蒸着工程を備えていてもよい。生産効率を高める観点から、金属蒸着工程についても、ロールツーロール方式で行われることが好ましい。その場合、蒸着用チャンバー内において、片面金属張積層板の金属シート面が蒸着用加熱ロールに接触するように、片面金属張積層板を蒸着用加熱ロールに導入し、蒸着用加熱ロール状で、熱可塑性液晶ポリマーフィルム面に対して、金属蒸着層を形成する。
本発明の一態様である金属張積層板は、熱可塑性液晶ポリマーフィルムと金属シートとが少なくとも積層された金属張積層板であって、金属シートとの接合面とは反対側の熱可塑性液晶ポリマーフィルム表面が、JIS Z 8741に基づく光沢度(20°)において55以上である、金属張積層板である。ここで、金属張積層板が、前記光沢度を有する熱可塑性液晶ポリマーフィルム表面に金属蒸着層を備えている場合、金属蒸着層をエッチング除去することにより、熱可塑性液晶ポリマーフィルム表面の光沢度を確認してもよい。
光沢度保持率=(60分連続運転後の光沢度/運転直後の光沢度)×100
ここで、「運転直後の光沢度」とは、ロールツーロール方式による運転を開始した直後に得られた積層体サンプルの熱可塑性液晶ポリマーフィルム表面の光沢度であり、「60分連続運転後の光沢度」は、60分間連続運転した後に得られた積層体サンプルの熱可塑性液晶ポリマーフィルム表面の光沢度である。
本発明の一態様である回路基板は、前記金属張積層板に、回路面が形成されている回路基板である。回路面は、公知のサブトラクティブ法、アディティブ法、セミアディティブ法などにより形成することができる。回路(金属層)の厚みは、例えば、10~14μmであってもよく、好ましくは11~13μmであってもよい。
回路面は、好ましくは熱可塑性液晶ポリマーフィルム面または金属蒸着層面に形成されていてもよい。または、金属蒸着層に対して、さらに金属メッキ層を形成し、前記金属メッキ面に回路面を形成してもよい。
JIS Z 8741に準じて、サンプルを平坦な机の上に置き、入射角20°でのサンプルの光沢度(グロス度)を光沢度計(スガ機械株式会社製「GC-1」)で測定した。なお、光沢度計の較正は、付属の較正板を用いて行った。
誘電率測定は周波数10GHzで共振摂動法により実施した。マイクロ波ネットワークアナライザ(Agilent社製)に40~67GHz対応プローブを接続し、40GHzおよび60GHzで伝送損失を測定した。
表面粗さは、JIS B0601:1994に準じ、接触式表面粗さ計(ミツトヨ(株)製、型式:SJ-201)を用いて十点平均粗さ(Rz)を測定した。より詳細には、十点平均粗さ(Rz)は、粗さ曲線から、その平均線の方向に基準長さを抜き取り、最高から5番目までの山頂(凸の頂点)の標高の平均値と、最深から5番目までの谷底(凹の底点)の標高の平均値との差をμmで表わした。
融点は、示差走査熱量計を用いて、フィルムの熱挙動を観察して得た。即ち、作製したフィルムを、20℃/分の速度で昇温して、完全に溶融させた後、溶融物を50℃/分の速度で50℃まで急冷し、再び20℃/分の速度で昇温した時に現れる吸熱ピークの位置を熱可塑性液晶ポリマーフィルムの融点とした。
融点は、熱機械分析装置を用いて、フィルムの熱挙動を観察して得た。即ち、作製したフィルムを、幅5mm長さ20mmの試験片として、チャック間距離15mmにて、引張荷重0.01N、昇温速度10℃/分の条件で試験片の長さ方向の熱膨張量を測定し、その変曲点を熱可塑性液晶ポリマーフィルムの熱変形温度とした。
(1)熱可塑性液晶ポリマーフィルムの作製
6-ヒドロキシ-2-ナフトエ酸単位(27モル%)、p-ヒドロキシ安息香酸単位(73モル%)からなるサーモトロピック液晶ポリエステルを、単軸押出機を用いて、280~300℃で加熱混練した後、直径40mm、スリット間隔0.6mmのインフレーションダイより押出し、厚さ50μmの熱可塑性液晶ポリマーフィルムを得た。この熱可塑性液晶ポリマーフィルムの融点Tmは282℃、熱変形温度Tdefは230℃であった。
図1を参照しつつ、片面金属張積層板の作製を説明する。前記(1)で作製した熱可塑性液晶ポリマーフィルムと、12μm厚みの圧延銅箔(JX日鉱日石金属(株)製、商品名:BHYX-HA-V2、Rz:0.9μm)とを、それぞれ、熱可塑性液晶ポリマーフィルム2および金属シート6として用意した。一方、連続熱ロールプレス装置10に、積層用加熱ロール7として、金属弾性ロール8と、加熱金属ロール9とをそれぞれ取り付け、金属弾性ロール8側に熱可塑性液晶ポリマーフィルム2が、加熱金属ロール9側に金属シート6が接触するように導入し、熱可塑性液晶ポリマーフィルム2および金属シート6を熱圧着し、片面金属張積層板19を作製した。
図2を参照しつつ、銅蒸着層の形成を説明する。真空蒸着装置(ロック技研工業(株)製、商品名:RVC-W-300)を使用したロールツーロール方式を採用して、上記片面金属張積層板19の液晶ポリマーフィルム2面に銅蒸着層(厚み:0.3μm)を形成した。
作製した両面金属張積層板21を用いて、裏面に導体箔が形成された板状誘電体基板の表面に線状の導体箔が形成された構造を有し、電磁波を伝達する50Ωの伝送路(マイクロストリップライン)を作製した。
具体的には、両面金属張積層板21の金属蒸着面をシード層とし、その上にレジストのパターンを形成した後、電解銅めっきを行って回路を成長させた。その後、レジストを除去し、回路間のシード層をエッチングすることにより、厚みを12μmの回路パターンを形成した。さらに、スルーホールめっきを行うことにより、回路の厚みが30μmであるマイクロストリップ回路基板を作製し、その伝送特性を測定した。得られた結果を表7に示す。
(1)熱可塑性液晶ポリマーフィルムの作製
6-ヒドロキシ-2-ナフトエ酸単位(20モル%)、p-ヒドロキシ安息香酸単位(80モル%)からなるサーモトロピック液晶ポリエステルを、単軸押出機を用いて、350℃で加熱混練した後、直径40mm、スリット間隔0.6mmのインフレーションダイより押出し、厚さ50μmの熱可塑性液晶ポリマーフィルムを得た。この熱可塑性液晶ポリマーフィルムの融点Tmは325℃、熱変形温度Tdefは310℃であった。
(2)熱可塑性液晶ポリマーフィルムとして、前記(1)で得られた熱可塑性液晶ポリマーフィルムを使用し、加熱金属ロール5の表面温度を300℃とする以外は、実施例1と同様にして片面金属張積層板を作製した。その後、蒸着用加熱ロール13の設定温度を(Tm-15)℃(Tm:フィルム融点)とする以外は、実施例1と同様にして両面金属張積層板、マイクロストリップ回路基板を得た。各種物性を表7に示す。
実施例1および2の片面金属張積層板について、それぞれ、運転開始60分後に得られた片面金属張積層板に代えて、運転開始直後に製造された片面金属張積層板を用いる以外は、それぞれ実施例1および2と同様にして、両面金属張積層板、マイクロストリップ回路基板を得た。各種物性を表7に示す。
金属弾性ロールに代えて、耐熱性ゴムロール[樹脂被覆金属ロール(由利ロール機械(株)製、商品名:スーパーテンペックス、樹脂厚み:1.7cm)、直径:40cm]を使用する以外は、実施例1と同様にして片面金属張積層板を作製した。その後、実施例1と同様にして両面金属張積層板、マイクロストリップ回路基板を得た。各種物性を表7に示す。
金属弾性ロールに代えて、耐熱性ゴムロール[樹脂被覆金属ロール(由利ロール機械(株)製、商品名:スーパーテンペックス、樹脂厚み:1.7cm)、直径:40cm]を使用する以外は、実施例2と同様にして片面金属張積層板を作製した。その後、実施例2と同様にして両面金属張積層板、マイクロストリップ回路基板を得た。各種物性を表7に示す。
比較例1および2の片面金属張積層板について、それぞれ、運転開始60分後に得られた片面金属張積層板に代えて、運転開始直後に製造された片面金属張積層板を用いる以外は、それぞれ比較例1および2と同様にして、両面金属張積層板、マイクロストリップ回路基板を得た。各種物性を表7に示す。
さらに、このような高い光沢度を反映し、実施例1~4で得られたマイクロストリップ回路基板の伝送損失は、40GHzおよび60GHzの双方において、比較例と比べて小さい値を示している。
6 金属シート
7 一対の加熱ロール
8 金属弾性ロール
9 加熱金属ロール
10 連続熱プレス装置
13 蒸着用加熱ロール
19 片面金属張積層板
21 両面金属張積層板
Claims (11)
- 熱可塑性液晶ポリマーフィルムと金属シートとが少なくとも積層された金属張積層板であって、金属シートとの接合面とは反対側の熱可塑性液晶ポリマーフィルム表面が、JIS Z 8741に基づく光沢度(20°)において55以上である、金属張積層板。
- 請求項1に記載の金属張積層板であって、熱可塑性液晶ポリマーフィルムの融点が290℃以上である、金属張積層板。
- 請求項1または2に記載の金属張積層板であって、さらに、前記熱可塑性液晶ポリマー表面に形成された金属蒸着層を備える、金属張積層板。
- 請求項1~3のいずれか一項に記載の金属張積層板であって、長手方向において、100m以上の長さを有する、金属張積層板。
- ロールツーロール方式により、熱可塑性液晶ポリマーフィルムの表面に金属シートが接合された金属張積層板の製造方法であって、
熱可塑性液晶ポリマーフィルムと金属シートとを準備する工程と、
前記熱可塑性液晶ポリマーフィルムと前記金属シートとを一対の加熱ロール間に導入し、前記熱可塑性液晶ポリマーフィルムと前記金属シートとを前記一対の加熱ロール間で圧着させる工程と、
を少なくとも備え、
前記一対の加熱ロールは、前記熱可塑性液晶ポリマーフィルムと接する側に金属弾性ロールを少なくとも備え、前記金属弾性ロールは、表面の十点平均粗さRzが0.2μm以下である、金属張積層板の製造方法。 - 請求項5に記載の金属張積層板の製造方法であって、前記一対の加熱ロールが、金属ロールと金属弾性ロールで構成される、金属張積層板の製造方法。
- 請求項6に記載の金属張積層板の製造方法であって、前記金属ロールが、内部加熱式の金属ロールである、金属張積層板の製造方法。
- 請求項5~7のいずれか一項に記載の金属張積層板の製造方法であって、前記金属弾性ロールが、ロール状の耐熱性ゴムと、その周囲に形成された金属表面層とで構成されている、金属張積層板の製造方法。
- 請求項8に記載の金属張積層板の製造方法であって、前記耐熱性ゴムの硬度が70~100であり、金属表面層の厚みが100μm~1000μmである、金属張積層板の製造方法。
- 請求項1~4のいずれか一項に記載の金属張積層板に、回路パターンが形成されている、回路基板。
- 請求項10に記載の回路基板であって、前記回路パターンが、熱可塑性液晶ポリマーフィルム表面または金属蒸着層表面に形成されている、回路基板。
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2021098366A (ja) * | 2019-12-23 | 2021-07-01 | 長春人造樹脂廠股▲分▼有限公司 | 積層体、回路基板、及びそれらに適用する液晶ポリマーフィルム |
| JP7372901B2 (ja) | 2019-12-23 | 2023-11-01 | 長春人造樹脂廠股▲分▼有限公司 | 積層体、回路基板、及びそれらに適用する液晶ポリマーフィルム |
| US11840602B2 (en) | 2019-12-23 | 2023-12-12 | Chang Chun Plastics Co., Ltd. | Laminate, circuit board, and liquid crystal polymer film applied to the same |
| US11926698B2 (en) | 2019-12-23 | 2024-03-12 | Chang Chun Plastics Co., Ltd. | Liquid crystal polymer film and laminate comprising the same |
| US11945907B2 (en) | 2019-12-23 | 2024-04-02 | Chang Chun Plastics Co., Ltd. | Liquid crystal polymer film and laminate comprising the same |
| US12103285B2 (en) | 2019-12-23 | 2024-10-01 | Chang Chun Plastics Co., Ltd. | Liquid crystal polymer film and laminate comprising the same |
| JPWO2022131045A1 (ja) * | 2020-12-14 | 2022-06-23 | ||
| WO2022131045A1 (ja) * | 2020-12-14 | 2022-06-23 | 株式会社バルカー | 液晶ポリマーフィルムおよび液晶ポリマーフィルムの製造方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110461593A (zh) | 2019-11-15 |
| TW201841723A (zh) | 2018-12-01 |
| CN110461593B (zh) | 2021-11-02 |
| TWI787249B (zh) | 2022-12-21 |
| JPWO2018186223A1 (ja) | 2020-05-14 |
| KR20190132648A (ko) | 2019-11-28 |
| EP3608100A4 (en) | 2020-12-09 |
| EP3608100B1 (en) | 2025-04-30 |
| EP3608100A1 (en) | 2020-02-12 |
| KR102635625B1 (ko) | 2024-02-13 |
| US20200031098A1 (en) | 2020-01-30 |
| WO2018186223A8 (ja) | 2019-09-26 |
| US12172408B2 (en) | 2024-12-24 |
| JP7138623B2 (ja) | 2022-09-16 |
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