WO2020153391A1 - 両面金属張積層体とその製造方法、絶縁フィルムおよび電子回路基板 - Google Patents
両面金属張積層体とその製造方法、絶縁フィルムおよび電子回路基板 Download PDFInfo
- Publication number
- WO2020153391A1 WO2020153391A1 PCT/JP2020/002058 JP2020002058W WO2020153391A1 WO 2020153391 A1 WO2020153391 A1 WO 2020153391A1 JP 2020002058 W JP2020002058 W JP 2020002058W WO 2020153391 A1 WO2020153391 A1 WO 2020153391A1
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- WO
- WIPO (PCT)
- Prior art keywords
- double
- insulating film
- clad laminate
- metal
- sided metal
- 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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- H05K2203/1105—Heating or thermal processing not related to soldering, firing, curing or laminating, e.g. for shaping the substrate or during finish plating
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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
- H05K2203/11—Treatments characterised by their effect, e.g. heating, cooling, roughening
- H05K2203/1121—Cooling, e.g. specific areas of a PCB being cooled during reflow soldering
-
- 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
Definitions
- the present invention relates to a double-sided metal-clad laminate, a method for producing the same, an insulating film used in the production method, and an electronic circuit board using the double-sided metal-clad laminate.
- thermoplastic liquid crystal polymer (LCP) has excellent heat resistance, mechanical strength, electrical characteristics, etc., it is widely used as an insulating film for electronic circuit boards and the like in the electric/electronic fields and in-vehicle parts fields.
- thermoplastic liquid crystal polymer film Since the thermoplastic liquid crystal polymer film has a structure in which linear and rigid molecular chains are regularly arranged, anisotropy is likely to occur. Therefore, a film obtained by extrusion-molding a thermoplastic liquid crystal polymer with a T-die or the like generally tends to have a high degree of molecular orientation in the extrusion direction in a plane. As a result, there is a possibility that the linear expansion coefficient at the time of heating may be different between the extrusion direction and the direction perpendicular thereto, and the appearance may be deformed.
- thermoplastic liquid crystal polymer film as an insulating film
- it is laminated with a metal foil and then integrated with a metal foil after performing a treatment for reducing the anisotropy of the thermoplastic liquid crystal polymer film.
- Patent Document 1 discloses a method of manufacturing a laminate for a flexible printed wiring board by continuously supplying an insulating film made of a liquid crystal polymer and a metal foil between a pair of endless belts and thermocompressing the insulating film. ing. In this method, the surface roughness of the metal foil and the heating temperature during thermocompression molding are specified.
- Patent Document 2 discloses a manufacturing method in which an insulating film made of a liquid crystal polymer and a metal foil are continuously supplied between a pair of endless belts and thermocompression bonded to each other to manufacture a flexible laminated plate. In this method, the maximum temperature of the flexible laminate and the outlet temperature when it is carried out from the endless belt are specified.
- the heating temperature at the time of thermocompression molding is equal to or higher than the melting point of the liquid crystal polymer, but when a highly anisotropic thermoplastic liquid crystal polymer film is used, the anisotropy remains. There is a risk. If the film retains anisotropy, the laminate may be warped or deformed, or burrs or cracks may be generated during perforation processing. Further, in the manufacturing method disclosed in Patent Document 2, since the heating temperature during thermocompression bonding is lower than the melting point of the liquid crystal polymer, a thermoplastic liquid crystal polymer film having strong anisotropy is used as in the method of Patent Document 1. If so, anisotropy may remain.
- the present invention has been made in view of the above situations. That is, the object of the present invention is to use a highly anisotropic insulating film made of a thermoplastic liquid crystal polymer, the degree of plane orientation in the thermoplastic liquid crystal polymer layer of the double-sided metal-clad laminate is small, It is an object of the present invention to provide a double-sided metal-clad laminate having a small dimensional change anisotropy and a method for producing the same. Another object of the present invention is to provide an electronic circuit board using the insulating film and the double-sided metal-clad laminate preferably used in the manufacturing method.
- the present inventors have been surprised to find that a certain temperature, pressure and time are selected and heated and pressurized in a state where an insulating film made of a thermoplastic liquid crystal polymer is sandwiched between a pair of endless belts and sandwiched between two metal foils. It was surprisingly found that the anisotropy of the insulating film was improved relatively easily.
- a double-sided metal-clad laminate having reduced anisotropy using an insulating film having a strong anisotropy without performing a conventional treatment for reducing anisotropy of a thermoplastic liquid crystal polymer film. Found that you can get.
- the present invention has been achieved based on such knowledge. That is, the present invention has the following configurations.
- a method for producing a double-sided metal-clad laminate according to the present invention is a method for producing a double-sided metal-clad laminate having a structure in which an insulating film made of a thermoplastic liquid crystal polymer is sandwiched between two metal foils, A supply step of continuously supplying the insulating film and the two metal foils between the endless belts, a laminated body by heating and pressurizing the insulating film sandwiched between the two metal foils between the endless belts And a cooling step of cooling the laminated body.
- the insulating film has a thickness of 10 to 500 ⁇ m, a degree of plane orientation of 30% or more, and an average linear expansion coefficient in the MD direction of ⁇ 40 to 0 ppm/K, the average linear expansion coefficient in the TD direction is 0 to 120 ppm/K, and when the melting point of the thermoplastic liquid crystal polymer is Tm (° C.), the heating temperature T (° C.) in the heating and pressing step is (Tm+20) ⁇ T ⁇ (Tm+70) is satisfied, the pressure in the heating/pressurizing step is 0.5 to 10 MPa, and the heating/pressurizing time in the heating/pressurizing step is 30 to 360 seconds. It has a feature.
- thermoplastic liquid crystal polymer layer after removing the metal foil of the obtained double-sided metal-clad laminate has a plane orientation degree of less than 30% and a MD direction
- the average linear expansion coefficient can be 0 to 40 ppm/K, and the average linear expansion coefficient in the TD direction can be 0 to 40 ppm/K.
- the metal foil is preferably a copper foil.
- the insulating film of the present invention comprises a step of continuously supplying an insulating film and two metal foils between a pair of endless belts, and using the two metal foils of the insulating film between the endless belts.
- the thickness is 10 to 500 ⁇ m, the degree of plane orientation is 30% or more, the average linear expansion coefficient in the MD direction is ⁇ 40 to 0 ppm/K, and the average linear expansion coefficient in the TD direction is 0 to 120 ppm/K.
- the double-sided metal-clad laminate according to the present invention is a double-sided metal-clad laminate having a structure in which an insulating film made of a thermoplastic liquid crystal polymer is sandwiched between two metal foils, and the double-sided metal-clad laminate may be the above-mentioned (1) or (2).
- the thermoplastic liquid crystal polymer layer produced by the method for producing a double-sided metal-clad laminate as described in 1) and having the metal foil removed, has a degree of plane orientation of less than 30% and an average linear expansion coefficient in the MD direction of 0 to 40 ppm/ It is characterized in that the average linear expansion coefficient in the K and TD directions is 0 to 40 ppm/K.
- the metal foil is preferably a copper foil.
- the electronic circuit board of the present invention uses the double-sided metal-clad laminate described in (5) or (6) above.
- the method for producing a double-sided metal-clad laminate of the present invention can use an insulating film having a strong anisotropy composed of a thermoplastic liquid crystal polymer, and the degree of plane orientation in the thermoplastic liquid crystal polymer layer of the double-sided metal-clad laminate is It is possible to obtain a double-sided metal-clad laminate that is small and has small anisotropy in dimensional change during heating.
- FIG. 2A is a two-dimensional diffraction image in X-ray diffraction
- FIG. 2B is an intensity curve.
- thermoplastic liquid crystal polymer refers to a thermoplastic polymer having a property of being in a liquid crystal state or optically birefringent when melted.
- thermoplastic liquid crystal polymer include a lyotropic liquid crystal polymer that exhibits liquid crystallinity in a solution state and a thermotropic liquid crystal polymer that exhibits liquid crystallinity when melted.
- the thermoplastic liquid crystal polymer is classified into type I, type II, and type III depending on the heat distortion temperature, and any type may be used.
- thermoplastic liquid crystal polymer for example, a thermoplastic aromatic liquid crystal polyester, or a thermoplastic aromatic liquid crystal polyester amide having an amide bond introduced therein can be mentioned.
- the thermoplastic liquid crystal polymer may be a polymer in which an aromatic polyester or aromatic polyester amide is further introduced with an imide bond, a carbonate bond, a bond derived from isocyanate such as a carbodiimide bond or an isocyanurate bond.
- the melting point of the thermoplastic liquid crystal polymer is preferably 220 to 400° C., more preferably 260 to 380° C., as determined by the DSC method. When the melting point of the thermoplastic liquid crystal polymer is within the above range, a film excellent in extrusion moldability and heat resistance can be obtained.
- thermoplastic liquid crystal polymer has a rigid rod-shaped structure, and since the molecules solidify in the state of being aligned in the molding flow direction, they have excellent dimensional stability of the molded product while exhibiting anisotropy. It has easy characteristics.
- the insulating film is a film produced by molding a thermoplastic liquid crystal polymer.
- a molding method for producing an insulating film from a thermoplastic liquid crystal polymer is not particularly limited, and examples thereof include known molding methods such as an extrusion molding method such as an inflation method and a T-die method, a casting method, and a calendering method. Of these, the T-die method is the most versatile. However, when a film is formed by the T-die method, a shear is applied in the MD direction when passing through the T-die, the thermoplastic liquid crystal polymer molecules are oriented, and anisotropy is easily developed in the MD direction.
- the MD direction is a molding flow direction (Machine Direction) in the film plane
- the TD direction is a direction perpendicular to the MD direction in the film plane.
- the thickness of the insulating film is 10 to 500 ⁇ m, preferably 15 to 400 ⁇ m.
- anisotropy can be reduced by the flow of polymer molecules when the insulating film is sandwiched between two endless belts and heated and pressed in a state of being sandwiched. ..
- a film when a film is formed from a thermoplastic liquid crystal polymer by the T-die method, a shear is applied in the MD direction, the film may be oriented, and anisotropy may appear in the MD direction.
- the film formed by the T-die method has a degree of plane orientation of 30% or more, an average linear expansion coefficient in the MD direction of ⁇ 40 to 0 ppm/K, and an average linear expansion coefficient in the TD direction of 0 to 120 ppm/K. There are many.
- the insulating film has a degree of plane orientation of 30% or more and an average linear expansion coefficient in the MD direction of ⁇ 40 to 0 ppm/K, A highly anisotropic insulating film having an average linear expansion coefficient in the TD direction of 0 to 120 ppm/K can be used.
- the average coefficient of linear expansion is measured by the TMA method according to JIS K7197.
- FIG. 1 is a schematic cross-sectional view of an apparatus 20 for manufacturing a double-sided metal-clad laminate according to this embodiment.
- the double-sided metal-clad laminate manufacturing apparatus 20 is a hydraulic double-belt press manufacturing apparatus, and it is possible to continuously heat and pressurize an insulating film between two metal foils to form a laminated body.
- the double-sided metal-clad laminate has excellent productivity.
- the manufacturing apparatus 20 is provided with an insulating film roll 11 and two metal foil rolls 12 laminated on both sides of the insulating film.
- the insulating film pulled out from the roll 11 is sandwiched between the two metal foils pulled out from the roll 12, and is supplied between the two conveyor devices 14.
- the manufacturing device 20 has two conveyor devices 14 at the top and bottom.
- the conveyor device 14 drives the endless belt 3 by the two endless belt rolls 1 and 2.
- the conveyor device 14 has therein a pressurizing block 4 having a heater block 5 and a cooling block 6 built therein.
- the two conveyor devices 14 can heat the insulating film and the metal foil, which are put in between, while continuously pressurizing them at a predetermined pressure, and then cool them.
- the material of the endless belt 3 is not particularly limited, and metal, resin, rubber or the like can be used, but metal is preferable in terms of heat resistance and thermal expansion.
- the pressure block 4 has the ability to press the insulating film and the metal foil with a predetermined pressure.
- the pressure block 4 is filled with oil.
- the oil in the pressure block 4 can be pressurized. When pressure is applied by hydraulic pressure, it is possible to uniformly apply pressure to the film surface, so that a defective appearance is unlikely to occur.
- the heater block 5 has a function of heating the insulating film and the metal foil to a predetermined temperature equal to or higher than the melting point of the thermoplastic liquid crystal polymer.
- the cooling block 6 has a function of cooling the insulating film and the metal foil to a temperature below the solidification temperature of the thermoplastic liquid crystal polymer at a predetermined cooling rate.
- the manufacturing apparatus 20 is equipped with a plurality of guide rolls 7 for conveying the insulating film and the metal foil.
- the manufacturing apparatus 20 can wind up the laminated body including the insulating film and the metal foil integrated by the two conveyor devices 14 as the roll 13.
- metal foil such as copper, copper alloy, aluminum, aluminum alloy, iron, iron alloy can be used. When used in applications such as electronic circuit boards, copper foil is preferred.
- the thickness of the metal foil is preferably 5 to 100 ⁇ m, more preferably 7 to 50 ⁇ m. If the thickness of the metal foil exceeds 100 ⁇ m, the thermoplastic liquid crystal polymer in the manufacturing apparatus 20 may be insufficiently heated and melted due to heat conduction. Further, the metal foil is preferably surface-treated in order to improve the adhesion to the insulating film.
- the surface treatment method there are methods such as surface roughening treatment, coating with a coupling agent or the like, acid/alkali treatment, and oxidation treatment. Known methods can be appropriately used for these surface treatment methods.
- the method for manufacturing a double-sided metal-clad laminate includes (1) a supply step of continuously supplying an insulating film and two metal foils between a pair of endless belts, and (2) an insulating film between the endless belts. Has a heating and pressurizing step of heating and pressurizing in a state of being sandwiched between two metal foils to form a laminated body, (3) a cooling step of cooling the laminated body, and (4) a winding step of winding the laminated body. ing. These four steps are shown in FIG. Each step of the method for producing a double-sided metal-clad laminate can be carried out in a batch system, but it is preferable to carry out in a continuous system from the viewpoint of productivity. Hereinafter, each step will be described.
- the supply step is a step of continuously supplying the insulating film and the two metal foils between the pair of endless belts 3 included in the two conveyor devices 14 of the manufacturing apparatus 20.
- the insulating film is supplied from the roll 11, and the two metal foils laminated on both surfaces of the insulating film are supplied from the roll 12.
- the heating and pressurizing step is a step of heating and pressurizing the insulating film between the endless belts 3 while sandwiching the insulating film between the two metal foils to form a laminate.
- the present inventors have proceeded with a study on a method of reducing the anisotropy by using an insulating film having a strong anisotropy.
- various studies were conducted on the temperature, pressure and time when heating and pressurizing the two metal foils and the insulating film between the endless belts 3.
- (1) When the thermoplastic liquid crystal polymer is heated to a specific temperature equal to or higher than the melting point, the thermoplastic liquid crystal polymer is melted, the entanglement between the polymer molecules is released in the molten state, and the melt viscosity is rapidly decreased, and The fluidity of the polymer is greatly increased.
- the heating temperature T (°C) in the heating/pressurizing step must satisfy (Tm+20) ⁇ T ⁇ (Tm+70).
- the heating temperature T (° C.) in the heating/pressurizing step is more preferably (Tm+20) ⁇ T ⁇ (Tm+60).
- the heating temperature in the heating and pressurizing step is within the range of the above formula, the melt viscosity of the thermoplastic liquid crystal polymer can be significantly reduced, the polymer molecules are fluidized, the entanglement between the molecules is released, and the anisotropy is increased. It can be greatly reduced. If the heating temperature T (° C.) exceeds (Tm+70), the thermoplastic liquid crystal polymer may be deteriorated, or the molten polymer may flow out of the metal foil and contaminate the device.
- the pressure in the heating and pressurizing step is 0.5 to 10 MPa, preferably 0.8 to 8 MPa.
- the pressure in the heating/pressurizing step is 0.5 MPa or more, the insulating film and the metal foil are sufficiently brought into close contact with each other, so that heat can be easily transferred to the insulating film.
- the pressure in the heating and pressurizing step is 10 MPa or less, the thickness of the insulating film is not significantly reduced, and therefore the molten polymer is less likely to flow and become anisotropic.
- the heating/pressurizing time in the heating/pressurizing step is 30 to 360 seconds, preferably 60 to 300 seconds.
- the heating and pressurizing time is within the above range, it is possible to secure the time for melting the thermoplastic liquid crystal polymer and reducing the anisotropy.
- the degree of plane orientation is 30% or more
- the average linear expansion coefficient in the MD direction is ⁇ 40 to 0 ppm/K
- the average linear expansion coefficient in the TD direction is Even if an insulating film having a strong anisotropy of 0 to 120 ppm/K is used, the thermoplastic liquid crystal polymer layer of the double-sided metal-clad laminate can be a layer having a small anisotropy.
- thermoplastic liquid crystal polymer layer having little anisotropy is a polymer having a degree of plane orientation of less than 30%, an average linear expansion coefficient in the MD direction of 0 to 40 ppm/K, and an average linear expansion coefficient in the TD direction of 0 to 40 ppm/K. It is a layer.
- the insulating film has a smaller value of any of the plane orientation degree, the average linear expansion coefficient in the MD direction and the average linear expansion coefficient in the TD direction than that of the insulating film having strong anisotropy, It can be used as an insulating film in a method for producing a metal-clad laminate.
- the degree of plane orientation of the insulating film is preferably 80% or less.
- thermoplastic liquid crystal polymer layer is greatly improved as described above in the manufacturing method of the present embodiment. Since the insulating film is heated in a state of being sandwiched between two metal foils and constrained, even if the melt viscosity of the molten polymer is greatly reduced, the molten polymer does not flow and the shape is not greatly deteriorated. Then, in that state, it is estimated that the orientation of the polymer molecules becomes random due to the micro free movement of the polymer molecules inside the film.
- the cooling step is a step of cooling the laminate obtained in the heating and pressing step to a temperature equal to or lower than the solidification temperature of the thermoplastic liquid crystal polymer.
- the heating and pressing step the insulating film whose anisotropy is reduced by heating and pressurizing is solidified by cooling to obtain a thermoplastic liquid crystal polymer layer whose anisotropy is relaxed and reduced.
- the cooling step it is preferable that the cooling is performed uniformly so that molding strain does not remain.
- the laminated body integrated through the heating/pressurizing step and the cooling step is wound around the winding roll 13 as a double-sided metal-clad laminated body. Further, it may be cut and stacked as a rectangular double-sided metal-clad laminate having a predetermined length without performing the winding step.
- the line speed of the manufacturing apparatus 20 is adjusted to a speed that can secure 30 to 360 seconds as the heating/pressurizing time in the heating/pressurizing step.
- the double-sided metal-clad laminate of the present embodiment is manufactured according to the double-sided metal-clad laminate manufacturing method using the above-described double-sided metal-clad laminate manufacturing apparatus 20. According to the method for producing a double-sided metal-clad laminate of the present embodiment, since the anisotropy of the insulating film used is greatly improved, the thermoplastic liquid crystal polymer layer of the double-sided metal-clad laminate has a small degree of plane orientation, The anisotropy of dimensional change during heating is also small.
- the thermoplastic liquid crystal polymer layer after removing the metal foil has a degree of plane orientation of less than 30% and an average linear expansion coefficient in the MD direction of 0 to 40 ppm/K. And the average linear expansion coefficient in the TD direction is 0 to 40 ppm/K.
- the degree of plane orientation of the thermoplastic liquid crystal polymer layer is preferably 20% or less.
- thermoplastic liquid crystal polymer layer has reduced anisotropy, the double-sided metal-clad laminate is less likely to warp or deform, and is less likely to cause burrs or cracks during perforation processing.
- the double-sided metal-clad laminate of the present embodiment uses a manufacturing method different from the manufacturing method of the double-sided metal-clad laminate of the present embodiment, focusing on the regulation of the thermoplastic liquid crystal polymer layer after the metal foil is removed.
- the manufacturing method of the double-sided metal-clad laminate of the present embodiment is a manufacturing method that has a simpler manufacturing process than the conventional method and is excellent in productivity.
- the applications of double-sided metal-clad laminates include electronic circuit boards such as printed wiring boards and module boards in the electric/electronic fields and in-vehicle parts fields. Further, as other uses, there are a flexible printed circuit board having high heat resistance, a solar panel circuit board, a high frequency wiring board, and the like. In particular, it has suitability for a flexible copper-clad laminate using an insulating film as a substrate.
- Insulating Film Insulating Film 1 LCP resin (product number A-5000, melting point 280° C., crystallization temperature 230° C.) manufactured by Ueno Pharmaceutical Co., Ltd. was formed with a single-screw extruder and a T-die to a thickness of 12 ⁇ m, 100 ⁇ m, 480 ⁇ m and 600 ⁇ m film
- Insulating film 2 Polyplastic LCP resin (product number C950RX, melting point 320° C., crystallization temperature 275° C.) formed by a single-screw extruder and T-die with a thickness of 100 ⁇ m
- Insulating film 3 Ueno Pharmaceutical Co., Ltd.
- Examples 1 to 8 and Comparative Examples 1 to 5 Using the manufacturing apparatus 20 shown in FIG. 1, a heating and pressurizing step is performed under various conditions shown in Table 1 in a state where both sides of various commercially available insulating films shown in Table 1 are in contact with two metal foils. It carried out, it was set as a laminated body, and it cooled after that, and the double-sided metal-clad laminated body was produced.
- thermoplastic liquid crystal polymer layer was taken out. The resulting thermoplastic liquid crystal polymer layer was washed with water and then naturally dried.
- thermoplastic liquid crystal polymer layer The degree of plane orientation and the average coefficient of linear expansion of each thermoplastic liquid crystal polymer layer were evaluated according to the methods described below. Moreover, the copper foil peeling strength of each double-sided metal-clad laminate was evaluated. The evaluation results are shown in Table 1.
- X-ray source Cu enclosure tube Applied voltage: 40 kV Current: 40mA X-ray output: 1.6 kW Detector: Multi-dimensional pixel detector HyPix-3000 X-ray irradiation direction: perpendicular to the film surface Integration time: 10 minutes Analysis 2 ⁇ angle range: 10° to 30° Sampling width when plotting the intensity in the circumferential direction of the two-dimensional diffraction image: 5° The strength of the thermoplastic liquid crystal polymer layer was subtracted from the strength of the thermoplastic liquid crystal polymer layer when the layer was not set in the apparatus to obtain the strength of the thermoplastic liquid crystal polymer layer. In the obtained two-dimensional diffraction image (Fig.
- the intensity was plotted against the rotation angle ⁇ in the circumferential direction to obtain the intensity curve in Fig. 2(b).
- the integral value (base area) of the base portion of the measured intensity for the circumference of 360° is B
- the integral value (peak area) of the portion obtained by subtracting the base portion from the measured peak portion is A.
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Abstract
Description
熱可塑性液晶ポリマーとは、溶融時に液晶状態あるいは光学的に複屈折する性質を有する熱可塑性ポリマーを指す。熱可塑性液晶ポリマーとしては、溶液状態で液晶性を示すリオトロピック液晶ポリマーや溶融時に液晶性を示すサーモトロピック液晶ポリマーがある。熱可塑性液晶ポリマーは、熱変形温度によって、I型、II型、III型と分類され、いずれの型であっても構わない。
絶縁フィルムは、熱可塑性液晶ポリマーを成形して製造されたフィルムである。熱可塑性液晶ポリマーから絶縁フィルムを製造する成形方法は特に限定されず、インフレーション法やTダイ法等の押出成形法、キャスト法、カレンダー法等の公知の成形方法を挙げることができる。これらの中では、Tダイ法が最も汎用的である。しかしながら、Tダイ法でフィルム成形した場合には、Tダイを通過するときにMD方向にシェアがかかり、熱可塑性液晶ポリマー分子が配向して、MD方向に異方性が発現し易い。ここで、MD方向とはフィルム面内における成形流れ方向(Machine Direction)であり、TD方向とはフィルム面内においてMD方向と垂直の方向である。
面配向度(%)={A/(A+B)}×100
図1は、本実施形態の両面金属張積層体の製造装置20の模式的断面図である。両面金属張積層体の製造装置20は、液圧式ダブルベルトプレス方式の製造装置であり、絶縁フィルムを2枚の金属箔で挟んだ状態で、連続的に加熱加圧して積層体とすることができ、両面金属張積層体の生産性に優れている。
本実施形態の両面金属張積層体の製造方法は、(1)一対のエンドレスベルト間に絶縁フィルムと2枚の金属箔とを連続的に供給する供給工程、(2)エンドレスベルト間で絶縁フィルムを2枚の金属箔で挟んだ状態で加熱加圧して積層体とする加熱加圧工程、(3)積層体を冷却する冷却工程、および(4)積層体を巻き取る巻き取り工程を有している。図1には、これらの4つの工程が示されている。両面金属張積層体の製造方法の各工程は、バッチ方式でも実施することができるが、生産性の点から連続方式で実施する方が好ましい。以下、各工程について説明する。
供給工程は、製造装置20の2台のコンベヤ装置14が有する一対のエンドレスベルト3間に、絶縁フィルムと2枚の金属箔とを連続的に供給する工程である。絶縁フィルムは、ロール11から供給され、絶縁フィルムの両面に積層される2枚の金属箔は、ロール12から供給される。
加熱加圧工程は、エンドレスベルト3間で、絶縁フィルムを2枚の金属箔で挟んだ状態で加熱加圧して積層体とする工程である。
冷却工程は、加熱加圧工程で得られた積層体を熱可塑性液晶ポリマーの固化温度以下の温度に冷却する工程である。加熱加圧工程において加熱加圧して異方性が低減された絶縁フィルムを冷却固化して、異方性が緩和低減された熱可塑性液晶ポリマー層とする。冷却工程では、成形ひずみが残らないように、均等に冷却することが好ましい。
製造装置20において、加熱加圧工程および冷却工程を経て一体化された積層体は、両面金属張積層体として、巻き取りロール13に巻き取られる。また、巻き取り工程を行わずに、所定の長さの長方形の両面金属張積層体として切り取って、積み重ねていってもよい。製造装置20のライン速度は、加熱加圧工程における加熱加圧時間として30~360秒が確保できる速度に調整される。
本実施形態の両面金属張積層体は、前記の両面金属張積層体の製造装置20を用いて、両面金属張積層体の製造方法に従って製造される。本実施形態の両面金属張積層体の製造方法によれば、用いた絶縁フィルムの異方性が大きく改善されるため、両面金属張積層体の熱可塑性液晶ポリマー層は、面配向度が小さく、加熱時の寸法変化の異方性も小さいものとなる。すなわち、得られた両面金属張積層体は、金属箔を除去した後の熱可塑性液晶ポリマー層が、面配向度が30%未満であり、MD方向の平均線膨張率が0~40ppm/Kであり、TD方向の平均線膨張率が0~40ppm/Kである。尚、熱可塑性液晶ポリマー層の面配向度は、20%以下が好ましい。
(1)絶縁フィルム
絶縁フィルム1:上野製薬社製LCP樹脂(品番A-5000、融点280℃、結晶化温度230℃)を単軸押出機とTダイで製膜した厚み12μm、100μm、480μmおよび600μmのフィルム
絶縁フィルム2:ポリプラスチック社製LCP樹脂(品番C950RX、融点320℃、結晶化温度275℃)を単軸押出機とTダイで製膜した厚み100μmのフィルム
絶縁フィルム3:上野製薬社製LCP樹脂(品番P-9000、融点340℃、結晶化温度305℃)を単軸押出機とTダイで製膜した厚み100μmのフィルム
(2)金属箔
銅箔:三井金属鉱業社製、品番TQ-M7-VSP、厚み12μm
図1に示す製造装置20を用いて、表1に記載した各種市販の絶縁フィルムの両面を2枚の金属箔と接触させた状態で、表1に記載した種々の条件で加熱加圧工程を行って積層体とし、その後冷却して、両面金属張積層体を作製した。
全自動多目的X線回折装置(株式会社リガク製、SmartLab(3kW)、2D-WAXS構成)を用いて、X線回折を行った。測定条件を以下に示す。
X線源:Cu封入管
印加電圧:40kV
電流:40mA
X線出力:1.6kW
検出器:多次元ピクセル検出器 HyPix-3000
X線照射方向:フィルム面に対して垂直
積算時間:10分
解析2θ角度範囲:10°~30°
2次元回折画像の円周方向において強度をプロットする際のサンプリング幅:5°
熱可塑性液晶ポリマー層を測定したときの強度から、同層を装置にセットせずに測定した場合の強度をブランクとして差し引いて、熱可塑性液晶ポリマー層の強度とした。
得られた2次元回折画像(図2(a))において、円周方向の回転角度βに対して強度をプロットすることにより、図2(b)の強度曲線を得た。図2(b)において、円周360°分の測定強度のベース部分の積分値(ベース面積)をBとし、測定されたピーク部分からベース部分を差し引いた部分の積分値(ピーク面積)をAとした。このとき、面配向度を下記式で算出した。
面配向度(%)={A/(A+B)}×100
面配向度が、30%未満のとき、合格と判定した。
JIS K 7197に準拠して、TMA法によって、MD方向、TD方向における23~200℃の温度範囲での平均線膨張率(ppm/K)を求めた。膨張したときは、+(プラス)の数値であり、収縮したときは、-(マイナス)の数値である。
JIS C 6481に準拠して、両面金属張積層体の銅箔を、巾10mmで速度50mm/分で、180°剥離したときの剥離力(N/mm)を測定した。
銅箔剥離強度は、0.5N/mm以上のとき良好と判定した。
3 エンドレスベルト
4 加圧ブロック
5 加熱ヒーターブロック
6 冷却ブロック
7 ガイドロール
11、12、13 ロール
14 コンベヤ装置
20 製造装置
Claims (7)
- 熱可塑性液晶ポリマーからなる絶縁フィルムを2枚の金属箔で挟んだ構成を有する両面金属張積層体の製造方法であって、
一対のエンドレスベルト間に前記絶縁フィルムと2枚の前記金属箔とを連続的に供給する供給工程、
前記エンドレスベルト間で前記絶縁フィルムを2枚の前記金属箔で挟んだ状態で加熱加圧して積層体とする加熱加圧工程、および
前記積層体を冷却する冷却工程を有し、
前記絶縁フィルムは、厚みが10~500μm、面配向度が30%以上、MD方向の平均線膨張率が-40~0ppm/K、TD方向の平均線膨張率が0~120ppm/Kであり、
前記熱可塑性液晶ポリマーの融点をTm(℃)としたとき、前記加熱加圧工程における加熱温度T(℃)が、(Tm+20)<T≦(Tm+70)を満足し、
前記加熱加圧工程における圧力が、0.5~10MPaであり、
前記加熱加圧工程における加熱加圧時間が、30~360秒である
ことを特徴とする両面金属張積層体の製造方法。 - 得られた両面金属張積層体の前記金属箔を除去した後の熱可塑性液晶ポリマー層は、面配向度が30%未満、MD方向の平均線膨張率が0~40ppm/K、TD方向の平均線膨張率が0~40ppm/Kであることを特徴とする請求項1に記載の両面金属張積層体の製造方法。
- 前記金属箔が銅箔である請求項1または請求項2に記載の両面金属張積層体の製造方法。
- 一対のエンドレスベルト間に絶縁フィルムと2枚の金属箔とを連続的に供給する供給工程、前記エンドレスベルト間で前記絶縁フィルムを2枚の前記金属箔で挟んだ状態で加熱加圧して積層体とする加熱加圧工程および前記積層体を冷却する冷却工程を有する両面金属張積層体の製造方法に用いる絶縁フィルムであって、
熱可塑性液晶ポリマーからなり、
厚みが10~500μm、面配向度が30%以上、MD方向の平均線膨張率が-40~0ppm/K、TD方向の平均線膨張率が0~120ppm/Kであることを特徴とする絶縁フィルム。 - 熱可塑性液晶ポリマーからなる絶縁フィルムを2枚の金属箔で挟んだ構成を有する両面金属張積層体であって、
請求項1に記載の両面金属張積層体の製造方法で製造され、
前記金属箔を除去した後の熱可塑性液晶ポリマー層は、面配向度が30%未満、MD方向の平均線膨張率が0~40ppm/K、TD方向の平均線膨張率が0~40ppm/Kであることを特徴とする両面金属張積層体。 - 前記金属箔が銅箔である請求項5に記載の両面金属張積層体。
- 請求項5または請求項6に記載の両面金属張積層体を用いた電子回路基板。
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| EP20745002.4A EP3915779A4 (en) | 2019-01-25 | 2020-01-22 | DOUBLE-SIDED METAL CLAD LAMINATE AND METHOD FOR ITS MANUFACTURE, INSULATION FOIL AND ELECTRONIC BASIC CIRCUIT BOARD |
| CN202080010195.1A CN113329871B (zh) | 2019-01-25 | 2020-01-22 | 两面覆金属层叠体和其制造方法、绝缘膜及电子电路基板 |
| KR1020217022440A KR102811630B1 (ko) | 2019-01-25 | 2020-01-22 | 양면 금속 클래드 적층체와 그 제조 방법, 절연 필름 및 전자 회로 기판 |
| JP2020568181A JP7458329B2 (ja) | 2019-01-25 | 2020-01-22 | 両面金属張積層体とその製造方法、絶縁フィルムおよび電子回路基板 |
| US17/425,680 US20220105707A1 (en) | 2019-01-25 | 2020-01-22 | Double-sided metal-clad laminate and production method therefor, insulating film, and electronic circuit base board |
| JP2024041515A JP2024071437A (ja) | 2019-01-25 | 2024-03-15 | 絶縁フィルム、両面金属張積層体および電子回路基板 |
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| WO2021112087A1 (ja) | 2019-12-03 | 2021-06-10 | デンカ株式会社 | 共重合体及びこれを含む積層体 |
| WO2022047837A1 (zh) * | 2020-09-04 | 2022-03-10 | 瑞声声学科技(深圳)有限公司 | 液晶聚合物薄膜的热处理方法及改性液晶聚合物薄膜 |
| WO2024203977A1 (ja) * | 2023-03-30 | 2024-10-03 | 宇部エクシモ株式会社 | フレキシブル金属張積層板、及びその製造方法 |
| WO2024219160A1 (ja) * | 2023-03-30 | 2024-10-24 | 宇部エクシモ株式会社 | フレキシブル金属張積層板、及びその製造方法 |
| WO2025192354A1 (ja) * | 2024-03-15 | 2025-09-18 | 株式会社クラレ | 金属張積層板の製造方法 |
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| WO2024203977A1 (ja) * | 2023-03-30 | 2024-10-03 | 宇部エクシモ株式会社 | フレキシブル金属張積層板、及びその製造方法 |
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| Publication number | Publication date |
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| JPWO2020153391A1 (ja) | 2021-12-02 |
| JP2024071437A (ja) | 2024-05-24 |
| CN113329871B (zh) | 2023-07-04 |
| KR20210119392A (ko) | 2021-10-05 |
| CN113329871A (zh) | 2021-08-31 |
| EP3915779A1 (en) | 2021-12-01 |
| KR102811630B1 (ko) | 2025-05-21 |
| EP3915779A4 (en) | 2022-10-19 |
| TWI866949B (zh) | 2024-12-21 |
| TW202035167A (zh) | 2020-10-01 |
| JP7458329B2 (ja) | 2024-03-29 |
| US20220105707A1 (en) | 2022-04-07 |
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