WO2018079710A1 - 金属積層用ポリイミドフィルム、およびこれを用いたポリイミド金属積層体 - Google Patents
金属積層用ポリイミドフィルム、およびこれを用いたポリイミド金属積層体 Download PDFInfo
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- WO2018079710A1 WO2018079710A1 PCT/JP2017/038889 JP2017038889W WO2018079710A1 WO 2018079710 A1 WO2018079710 A1 WO 2018079710A1 JP 2017038889 W JP2017038889 W JP 2017038889W WO 2018079710 A1 WO2018079710 A1 WO 2018079710A1
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- Prior art keywords
- polyimide
- metal
- heat
- polyimide film
- layer
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- 0 CBN(C(*1(C(N2C)=O)C2=O)=O)C1=O Chemical compound CBN(C(*1(C(N2C)=O)C2=O)=O)C1=O 0.000 description 4
Classifications
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08G73/1042—Copolyimides derived from at least two different tetracarboxylic compounds or two different diamino compounds
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- C08G73/1071—Wholly aromatic polyimides containing oxygen in the form of ether bonds in the main chain
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
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- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/22—Plastics; Metallised plastics
- C09J7/25—Plastics; Metallised plastics based on macromolecular compounds obtained otherwise than by reactions involving only carbon-to-carbon unsaturated bonds
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
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- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
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- C—CHEMISTRY; METALLURGY
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- C—CHEMISTRY; METALLURGY
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- C—CHEMISTRY; METALLURGY
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Definitions
- the present invention relates to a metal laminate polyimide film and a polyimide metal laminate using the metal laminate polyimide film.
- Patent Document 1 discloses a polyimide film having a heat-fusible property in which a heat-fusible polyimide layer is laminated on a heat-resistant polyimide layer. Also disclosed are copper clad laminates.
- Patent Documents 2 and 3 propose a polyimide film in which a dielectric constant and a dielectric loss tangent are reduced by introducing a long chain skeleton into a polyimide molecular chain to lower the imide group concentration in the molecule. Has been.
- an object of this invention is to provide the polyimide film for metal laminations which reduced the dielectric constant and dielectric loss tangent, without impairing high heat resistance and mechanical characteristics.
- the present invention relates to the following items.
- It is a polyimide film for metal lamination in which a metal adhesive layer is provided on at least one side of a heat-resistant polyimide layer, 5% weight loss temperature in a nitrogen atmosphere is 500 ° C. or higher, A polyimide film for metal lamination having a dielectric loss tangent of 0.007 or less at a frequency of 11.4 GHz.
- Item 2 The polyimide film for metal lamination according to Item 1, wherein the polyimide constituting the heat-resistant polyimide layer is a polyimide composed of a repeating unit represented by the following chemical formula (1).
- A is a group represented by the following chemical formula (2) in an amount of 50 to 100 mol%, 0 to 50 mol% is a group represented by the following chemical formula (3), and B is 50 ⁇ 100 mol% is a group represented by the following chemical formula (4), and two or more groups may be contained.
- n represents an integer of 1 to 4.
- Item 3. The polyimide film for metal lamination according to Item 1 or 2, wherein the metal adhesive layer is made of heat-fusible polyimide. 4).
- the polyimide film for metal lamination of the present invention is obtained by providing a metal adhesive layer on at least one surface of a heat-resistant polyimide layer (core layer).
- a metal adhesion layer is a layer used in order to adhere a metal layer to the polyimide film for metal lamination of the present invention.
- a heat-bondable polyimide layer (heat-bonding layer) is used as the metal adhesive layer, and this is laminated on at least one surface of the heat-resistant polyimide layer. It is a heat-fusible polyimide film.
- polyimide film for metal lamination of this invention improved the adhesiveness which consists of a heat resistant polyimide and a silane coupling agent as a metal contact bonding layer, for example in the at least single side
- It is a surface-modified polyimide film in which a polyimide layer (surface-modified layer) is formed.
- heat resistance means that the glass transition temperature (Tg) is 350 ° C. or higher, or Tg is not observed up to the decomposition temperature.
- Heat-bonding means that the softening point is less than 350 ° C.
- the softening point is a temperature at which the object softens suddenly when heated, and Tg is the softening point for amorphous polyimide, and the melting point is the softening point for crystalline polyimide.
- Tg is the softening point for amorphous polyimide
- the melting point is the softening point for crystalline polyimide.
- a softening point is 200 degreeC or more.
- the heat resistant polyimide layer is made of a heat resistant polyimide obtained by polymerizing a tetracarboxylic acid component and a diamine component.
- the heat-resistant polyimide preferably uses 3,3 ′, 4,4′-biphenyltetracarboxylic dianhydride as a tetracarboxylic acid component in an amount of 50 to 100 mol% in the total tetracarboxylic acid component.
- At least one tetracarboxylic dianhydride selected from pyromellitic dianhydride and 4,4′-oxydiphthalic dianhydride may be used in a range of less than 50 mol% in the total tetracarboxylic acid component. Good.
- the total amount of these tetracarboxylic acid components is preferably 70 mol% or more, more preferably 80 mol% or more, and more preferably 90 mol% or more in the total tetracarboxylic acid components.
- the heat-resistant polyimide has at least one selected from p-phenylenediamine, benzidine, 4,4 ′′ -diamino-p-terphenyl and 4,4 ′ ′′-diamino-p-quaterphenyl as a diamine component. It is preferable to use 50 to 100 mol% of diamine in the total diamine component. The total amount of these diamine components is preferably 70 mol% or more, more preferably 80 mol% or more, and more preferably 90 mol% or more in the total diamine components. Further, for example, other diamines such as 4,4'-diaminodiphenyl ether may be used in a range of less than 50 mol% in the total diamines.
- polyimides suitable for use in the heat-resistant polyimide layer of the present invention include polyimides composed of repeating units represented by the following chemical formula (1).
- A is a group represented by the following chemical formula (2) in an amount of 50 to 100 mol%, 0 to 50 mol% is a group represented by the following chemical formula (3), and B is 50 ⁇ 100 mol% is a group represented by the following chemical formula (4), and two or more groups may be contained.
- n represents an integer of 1 to 4.
- the heat-fusible polyimide layer is made of a heat-fusible polyimide obtained by polymerizing a tetracarboxylic acid component and a diamine component.
- the heat-fusible polyimide contains 3,3 ′, 4,4′-biphenyltetracarboxylic dianhydride, 2,3,3 ′, 4′-biphenyltetracarboxylic dianhydride, and tetracarboxylic acid component. It is preferable to use 50 to 100 mol% of at least one tetracarboxylic dianhydride selected from pyromellitic dianhydride in the total tetracarboxylic acid component.
- the total amount of these tetracarboxylic acid components is preferably 70 mol% or more, more preferably 80 mol% or more, and more preferably 90 mol% or more in the total tetracarboxylic acid components.
- a diamine represented by the following chemical formula (5) as a diamine component in an amount of 50 to 100 mol% in the total diamine component.
- the total amount of these diamine components is preferably 70 mol% or more, more preferably 80 mol% or more, and more preferably 90 mol% or more in the total diamine components.
- X represents O, CO, C (CH 3 ) 2 , CH 2 , SO 2 , S, or a direct bond, and may have two or more types of bond, An integer from 0 to 4 is indicated.
- Examples of the diamine represented by the chemical formula (5) include 1,3-bis (4-aminophenoxy) benzene, 1,4-bis (4-aminophenoxy) benzene, 4,4′-bis (3-amino). Phenoxy) biphenyl, 4,4′-bis (4-aminophenoxy) biphenyl, 3,3′-diaminobenzophenone, bis [4- (3-aminophenoxy) phenyl] ketone, bis [4- (4-aminophenoxy) Phenyl] ketone, bis [4- (3-aminophenoxy) phenyl] sulfide, bis [4- (4-aminophenoxy) phenyl] sulfide, bis [4- (3-aminophenoxy) phenyl] sulfone, bis [4- (4-Aminophenoxy) phenyl] sulfone, bis [4- (3-aminophenoxy) phenyl] ether, bis
- a coupling agent may be blended if necessary, and examples of the coupling agent include a silane coupling agent and a titanate coupling agent.
- the silane coupling agent and the titanate coupling agent those similar to those used for the surface modification layer described later can be used.
- a fine inorganic filler or organic filler can be blended as necessary.
- the shape of the inorganic filler include a particle shape or a flat shape.
- the inorganic filler include fine particles of inorganic oxide powders such as titanium dioxide powder, silicon dioxide (silica) powder, magnesium oxide powder, aluminum oxide (alumina) powder, and zinc oxide powder, and particulate silicon nitride powder.
- inorganic nitride powders such as titanium nitride powder, inorganic carbide powders such as particulate silicon carbide powder, and inorganic salt powders such as particulate calcium carbonate powder, calcium sulfate powder and barium sulfate powder Can do.
- organic filler include polyimide particles and thermosetting resin particles. These fillers may be used in combination of two or more. About the usage-amount and shape (size, aspect-ratio) of a filler, it is preferable to select according to the intended purpose. Moreover, in order to disperse
- the surface modification layer is a polyimide layer made of heat-resistant polyimide and a silane coupling agent and having improved adhesion.
- the heat-resistant polyimide used may be the same as or different from the polyimide forming the heat-resistant polyimide layer (core layer).
- the surface modification layer can be formed by the method described later.
- silane coupling agent examples include epoxy silanes such as ⁇ -glycidoxypropyltrimethoxysilane, ⁇ -glycidoxypropyldiethoxysilane, and ⁇ - (3,4-epoxycyclohexyl) ethyltrimethoxysilane; vinyltrichloro Vinylsilanes such as silane, vinyltris ( ⁇ -methoxyethoxy) silane, vinyltriethoxysilane, vinyltrimethoxysilane; acrylic silanes such as ⁇ -methacryloxypropyltrimethoxysilane; N- ⁇ - (aminoethyl) - ⁇ - Aminosilanes such as aminopropyltrimethoxysilane, N- ⁇ - (aminoethyl) - ⁇ -aminopropylmethyldimethoxysilane, ⁇ -aminopropyltriethoxysilane, N-phenyl- ⁇ -aminopropyltri
- titanate coupling agents include isopropyl triisostearoyl titanate, isopropyl tridecylbenzenesulfonyl titanate, isopropyl tris (dioctylpyrophosphate) titanate, tetraisopropylbis (dioctyl phosphite) titanate, tetra (2,2-diallyloxymethyl) -1-butyl) bis (di-tridecyl) phosphite titanate, bis (dioctylpyrophosphate) oxyacetate titanate, bis (dioctylpyrophosphate) ethylene titanate, isopropyltrioctanoyl titanate, isopropyltricumylphenyl titanate, etc. it can.
- the polyimide film for metal lamination of the present invention preferably has sufficient heat resistance.
- the 5% weight loss temperature in a nitrogen atmosphere is preferably 500 ° C. or higher, more preferably 530 ° C. or higher.
- it is 550 degreeC or more, More preferably, it is 560 degreeC or more.
- the polyimide film for metal lamination of the present invention preferably has good signal transmission characteristics in a high frequency range.
- the dielectric loss tangent at a frequency of 11.4 GHz is preferably 0.007 or less, and 0.006 or less. More preferably, it is more preferably 0.005 or less.
- the polyimide film for metal lamination of the present invention contains water in the polyimide film due to moisture absorption because the dielectric constant and dielectric loss tangent are increased. Therefore, the polyimide film for metal lamination of the present invention has a saturated moisture absorption rate of preferably 1.3% by mass or less, more preferably 1.1% by mass or less, and still more preferably 0.9% by mass or less. . Moreover, the polyimide film for metal lamination of the present invention has a moisture absorption rate of preferably 0.7% by mass or less, more preferably 0.5% by mass or less, at a temperature of 25 ° C. and a relative humidity (RH) of 60%. More preferably, it is 0.4 mass% or less.
- the heat-fusible polyimide film which is one embodiment of the present invention is a heat-fusible polyimide on one or both sides of a self-supporting film obtained from a polyimide precursor solution (polyamic acid solution) that gives heat-resistant polyimide.
- a polyimide precursor solution polyamic acid solution
- the coupling agent and filler are preferably added to the polyimide precursor solution, and a basic organic compound may be added to these polyimide precursor solutions for the purpose of promoting imidization.
- a basic organic compound may be added to these polyimide precursor solutions for the purpose of promoting imidization.
- imidazole, 2-methylimidazole, 1,2-dimethylimidazole, 2-phenylimidazole, benzimidazole, isoquinoline, substituted pyridine and the like are 0.05 to 10% by mass with respect to the polyamic acid (polyimide precursor), preferably It can be used in a proportion of 0.05 to 5% by mass, particularly preferably 0.1 to 2% by mass. Since a polyimide film is formed at a relatively low temperature by using these compounds, these compounds are used to avoid imidization becoming insufficient.
- Examples of the organic solvent for producing the polyimide precursor solution include N-methyl-2-pyrrolidone, N, N-dimethylacetamide, N, N-diethylacetamide, N, N-dimethylformamide, N, N-diethylformamide.
- Amides such as hexamethylsulfuramide, sulfoxides such as dimethyl sulfoxide and diethyl sulfoxide, and sulfones such as dimethyl sulfone and diethyl sulfone. These solvents may be used alone or in combination.
- the polyimide precursor solution is, for example, a substantially equal mole of a tetracarboxylic acid component and a diamine component, or a little excess of either component (acid component or diamine component), and a reaction temperature of 100 ° C. or less.
- the polyamic acid solution can be produced by reacting at 80 ° C. or less, more preferably 0 to 60 ° C. for about 0.2 to 60 hours.
- the heat-fusible polyimide film of the present invention can also be produced by a coextrusion-casting film forming method (also simply referred to as a coextrusion method). Specifically, using an extruder having two or more extrusion dies, a polyimide precursor solution that gives a heat-resistant polyimide layer and a polyimide precursor solution that gives a heat-fusible polyimide layer from a die outlet Are cast on a support to form a laminated thin film. Next, the thin film on the support is dried to form a multilayer self-supporting film, which is heated and dried to perform imidization.
- a coextrusion-casting film forming method also simply referred to as a coextrusion method.
- a surface-modified polyimide film which is another embodiment of the present invention is a silane coupling agent solution on one or both sides of a self-supporting film obtained from a polyimide precursor solution (polyamic acid solution) that gives heat-resistant polyimide.
- a polyimide precursor solution polyamic acid solution
- heat-resistant polyimide can be produced by applying imidization by heating and drying.
- the heat-resistant polyimide constituting the core layer and the heat-resistant polyimide constituting the surface modification layer are the same.
- the surface-modified polyimide film includes a polyimide precursor that includes a polyimide precursor that gives a heat-resistant polyimide different from the heat-resistant polyimide constituting the core layer on one or both sides of the self-supporting film, and a silane coupling agent. It can also be produced by applying a solution, heating and drying to perform imidization. In this case, the heat-resistant polyimide constituting the core layer and the heat-resistant polyimide constituting the surface modification layer are different.
- the polyimide precursor solution that gives the heat-resistant polyimide may be the same as that used in the production of the heat-fusible polyimide film.
- the solvent of the solution used for coating is preferably a solvent that is compatible with the solvent contained in the self-supporting film, and more preferably the same solvent as that contained in the self-supporting film.
- a metal foil such as a copper foil is laminated on the surface of the heat-fusible polyimide film on which the heat-fusible polyimide layer is laminated.
- the metal foil may be laminated on both sides of the heat-fusible polyimide film, or may be laminated only on one side.
- the metal foil examples include aluminum foil, copper foil, and stainless steel foil.
- a copper foil is usually used.
- Specific examples of the copper foil include rolled copper foil and electrolytic copper foil.
- the thickness of the copper foil is not particularly limited, but is preferably 2 to 35 ⁇ m, and particularly preferably 5 to 18 ⁇ m.
- a copper foil with a carrier for example, a copper foil with an aluminum foil carrier can be used.
- the polyimide metal laminate can be produced by stacking a metal foil on the surface of the heat-fusible polyimide film on which the heat-fusible polyimide layer is laminated, and thermocompression bonding.
- the heat-fusible polyimide film and the metal foil are heated at least by a pair of pressure members so that the temperature of the pressure part is 30 ° C. higher than the glass transition temperature of the heat-fusible polyimide and 420 ° C. or lower. It is preferable to perform thermocompression bonding continuously. Specifically, it is preferable to perform thermocompression bonding in a temperature range of 350 ° C. or higher and 420 ° C. or lower.
- the pressure member examples include a pair of pressure-bonding metal rolls (the pressure-bonding portion may be made of metal or ceramic sprayed metal), a double belt press, and a hot press, and particularly capable of thermocompression bonding and cooling under pressure.
- a hydraulic double belt press is particularly preferred.
- a polyimide metal laminate can be easily obtained by roll lamination using a pair of crimped metal rolls.
- the first metal layer is laminated by a metalizing method on the surface having the surface modified layer of the surface modified polyimide film, and further by a plating method.
- a second metal layer is laminated on the surface.
- the metalizing method is a method of forming a metal layer by a method such as vacuum deposition, sputtering, ion plating, electron beam, etc., rather than metal plating or metal foil lamination.
- a metal such as vacuum deposition, sputtering, ion plating, electron beam, etc.
- Metals such as copper, nickel, chromium, manganese, aluminum, iron, molybdenum, cobalt, tungsten, vanadium, titanium, tantalum, or those alloys, or oxides of those metals, These metal carbides can be mentioned.
- the number of metal layers formed by the metalizing method may be appropriately selected according to the purpose of use, and may be one layer, two layers, or three or more layers.
- the thickness of the metal layer to be formed is preferably 1 to 500 nm, more preferably 5 to 200 nm.
- a metal layer such as copper or tin can be further formed on the surface of the metal layer provided by the metalizing method by a known wet plating method such as electrolytic plating or electroless plating.
- the thickness of the metal layer formed by plating is preferably in the range of 1 ⁇ m to 9 ⁇ m because it is suitable for practical use.
- a specific polyimide metal laminate for example, two layers of a 1 nm to 30 nm Ni / Cr alloy layer and a 100 nm to 1000 nm copper layer are laminated by a metalizing method, and further a 1 ⁇ m to 9 ⁇ m copper layer is formed by a plating method.
- stacked The thing laminated
- the polyimide metal laminate of the present invention preferably has good adhesion strength between the metal layer and the polyimide film for metal lamination.
- the peel strength measured by the method of JIS C6471 is preferably 0.5 N / mm or more, more preferably 0.7 N / mm or more.
- Dielectric Properties of Polyimide Film The relative dielectric constant ( ⁇ ) and dielectric loss tangent (tan ⁇ ) of the polyimide film were measured according to the method of ASTM D2520. The measurement was performed using a cylindrical resonator TM020 mode at a measurement frequency of 11.4 GHz. 3. Linear expansion coefficient of polyimide film A sample sampled to a length of 15 mm / width of 3 mm was measured in a tensile mode, a load of 4 gf, and a temperature rising rate of 20 ° C./min. From the TMA curve from 50 ° C. to 200 ° C., the linear expansion coefficient (CTE ) was calculated. 4).
- Peel strength of copper clad laminate was measured by the method of JIS C6471. 5.5% Weight Loss Temperature Seiko Instruments Inc. It was measured by EXSTAR TG / DTA 7200 (temperature increase rate: 10 ° C./min, under nitrogen or air stream).
- a polyamic acid solution E was obtained in the same manner as in the synthesis of the polyamic acid solution B except that the molar ratio of s-BPDA to ODPA was 40:60.
- a polyamic acid solution G was obtained in the same manner as the synthesis of the polyamic acid solution F except that the molar ratio of s-BPDA, ODPA, and PMDA was set to 65: 30: 5.
- Example 1 From the three-layer extrusion die, the polyamic acid solution H (thermal fusion layer) -polyamic acid solution C (core layer) -polyamic acid solution H (thermal fusion layer) is formed on the upper surface of the smooth metal support.
- the polyamic acid solution H and the polyamic acid solution C were extruded and cast into a thin film.
- the thin film casting was continuously dried with hot air at 145 ° C. to form a self-supporting film. After peeling the self-supporting film from the support, it is gradually heated from 200 ° C. to 390 ° C.
- Example 2 Except that the thickness of the heat-sealable polyimide film was 50 ⁇ m (the thickness of the two heat-sealable layers was 5.7 ⁇ m and the thickness of the core layer was 38.6 ⁇ m), A heat-fusible polyimide film having a layer structure and a copper-clad laminate thereof were obtained. Each evaluation result is shown in Table 2.
- Example 3 From the three-layer extrusion die, the polyamic acid solution H (thermal fusion layer) -polyamic acid solution K (core layer) -polyamic acid solution H (thermal fusion layer) is formed on the upper surface of the smooth metal support.
- the polyamic acid solution H and the polyamic acid solution K were extruded and cast into a thin film.
- the thin film casting was continuously dried with hot air at 145 ° C. to form a self-supporting film. After peeling off the self-supporting film from the support, it is gradually heated from 200 ° C. to 390 ° C.
- Example 4 From the three-layer extrusion die, the polyamic acid solution H (thermal fusion layer) -polyamic acid solution L (core layer) -polyamic acid solution H (thermal fusion layer) is formed on the upper surface of the smooth metal support.
- the polyamic acid solution H and the polyamic acid solution L were extruded and cast into a thin film.
- the thin film casting was continuously dried with hot air at 145 ° C. to form a self-supporting film. After peeling the self-supporting film from the support, it is gradually heated from 200 ° C. to 390 ° C.
- Example 5 Except that the thickness of the heat-fusible polyimide film was 50 ⁇ m (the thickness of the two heat-fusible layers was 5.7 ⁇ m and the thickness of the core layer was 38.6 ⁇ m), A heat-fusible polyimide film having a layer structure was obtained. The evaluation results are shown in Table 4.
- the polyimide film for metal lamination of the present invention is a polyimide film for metal lamination with reduced dielectric constant and dielectric loss tangent while maintaining high heat resistance, and is useful as an electronic substrate material, particularly as a substrate material for high frequency.
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Abstract
Description
1.耐熱性ポリイミド層の少なくとも片面に金属接着層を設けた金属積層用ポリイミドフィルムであって、
窒素雰囲気中での5%重量減少温度が500℃以上であり、
周波数11.4GHzにおける誘電正接が0.007以下である、金属積層用ポリイミドフィルム。
2.耐熱性ポリイミド層を構成するポリイミドは、下記化学式(1)で表される繰り返し単位からなるポリイミドである前記項1に記載の金属積層用ポリイミドフィルム。
3.金属接着層が熱融着性ポリイミドからなる前記項1または2に記載の金属積層用ポリイミドフィルム。
4.金属接着層が耐熱性ポリイミドとシランカップリング剤からなる前記項1または2に記載の金属積層用ポリイミドフィルム。
5.前記項1ないし4のいずれか一つに記載の金属積層用ポリイミドフィルムの金属接着層を設けた面に、さらに金属層を積層したポリイミド金属積層体。
本発明の金属積層用ポリイミドフィルムは、耐熱性ポリイミド層(コア層)の少なくとも片面に金属接着層を設けたものである。金属接着層は、本発明の金属積層用ポリイミドフィルムに金属層を接着させるために用いられる層である。本発明の金属積層用ポリイミドフィルムの一つの実施形態は、例えば、金属接着層として熱融着性ポリイミド層(熱融着層)を用い、これを耐熱性ポリイミド層の少なくとも片面に積層した多層の熱融着性ポリイミドフィルムである。また、本発明の金属積層用ポリイミドフィルムの他の実施形態は、例えば、耐熱性ポリイミド層の少なくとも片面に、金属接着層として、耐熱性ポリイミドとシランカップリング剤からなる、接着性を向上させたポリイミド層(表面改質層)を形成した表面改質ポリイミドフィルムである。
ここで、「耐熱性」とは、ガラス転移温度(Tg)が350℃以上であるか、または分解温度までTgが観測されないことをいう。また、「熱融着性」とは、軟化点が350℃未満であることをいう。軟化点は、対象物が加熱時に急激に軟化する温度であり、非結晶性ポリイミドではTgが軟化点となり、結晶性ポリイミドでは融点が軟化点となる。なお、本発明の金属積層用ポリイミドフィルムにおいては、軟化点は200℃以上であることが好ましい。
耐熱性ポリイミド層は、テトラカルボン酸成分とジアミン成分とを重合して得られる耐熱性ポリイミドからなる。
前記耐熱性ポリイミドは、テトラカルボン酸成分として、3,3’,4,4’-ビフェニルテトラカルボン酸二無水物を、全テトラカルボン酸成分中50~100モル%用いることが好ましい。さらに、ピロメリット酸二無水物および4,4’-オキシジフタル酸二無水物から選ばれる少なくとも1種のテトラカルボン酸二無水物を、全テトラカルボン酸成分中50モル%未満の範囲で用いてもよい。これらのテトラカルボン酸成分の合計量は、全テトラカルボン酸成分中70モル%以上であることが好ましく、80モル%以上であることがさらに好ましく、90モル%以上であることがより好ましい。また、前記以外の他のテトラカルボン酸成分を、全テトラカルボン酸成分中50モル%未満の範囲で用いてもよい。
熱融着性ポリイミド層は、テトラカルボン酸成分とジアミン成分とを重合して得られる熱融着性ポリイミドからなる。
前記熱融着性ポリイミドは、テトラカルボン酸成分として、3,3’,4,4’-ビフェニルテトラカルボン酸二無水物、2,3,3’,4’-ビフェニルテトラカルボン酸二無水物およびピロメリット酸二無水物から選ばれる少なくとも1種のテトラカルボン酸二無水物を、全テトラカルボン酸成分中50~100モル%用いることが好ましい。これらのテトラカルボン酸成分の合計量は、全テトラカルボン酸成分中70モル%以上であることが好ましく、80モル%以上であることがさらに好ましく、90モル%以上であることがより好ましい。
表面改質層は、耐熱性ポリイミドとシランカップリング剤からなる、接着性を向上させたポリイミド層である。用いる耐熱性ポリイミドは、耐熱性ポリイミド層(コア層)を形成するポリイミドと同じであってもよく、異なっていても構わない。表面改質層は後述の方法で形成することができる。
本発明の実施形態の一つである熱融着性ポリイミドフィルムは、耐熱性ポリイミドを与えるポリイミド前駆体溶液(ポリアミック酸溶液)から得られる自己支持性フィルムの片面または両面に、熱融着性ポリイミドを与えるポリイミド前駆体溶液(ポリアミック酸溶液)を塗工し、得られた多層の自己支持性フィルムを加熱、乾燥してイミド化を行うことにより製造することができる。
本発明の実施形態のもう一つである表面改質ポリイミドフィルムは、耐熱性ポリイミドを与えるポリイミド前駆体溶液(ポリアミック酸溶液)から得られる自己支持性フィルムの片面または両面に、シランカップリング剤溶液を塗工し、加熱、乾燥してイミド化を行うことにより製造することができる。この場合、コア層を構成する耐熱性ポリイミドと表面改質層を構成する耐熱性ポリイミドは同一となる。
本発明のポリイミド金属積層体の実施形態の一つは、前記熱融着性ポリイミドフィルムの熱融着性ポリイミド層を積層した面に、銅箔などの金属箔を積層したものである。金属箔は熱融着性ポリイミドフィルムの両面に積層してもよく、片面にのみ積層してもよい。
1.ポリイミドフィルムの吸水率
23℃の水に24時間以上浸漬して吸水させたサンプルの絶乾重量からの重量増加を測定し次式により吸水率(飽和)を算出した。
吸水率(%)=[(吸水後重量)-(絶乾重量)]/(絶乾重量)×100
同様にして、25℃、60%RHの恒温恒湿器中で24時間以上吸水させたサンプルを用いて吸水率(25℃/60%RH)を算出した。
2.ポリイミドフィルムの誘電特性
ポリイミドフィルムの比誘電率(ε)、および誘電正接(tanδ)は、ASTM D2520の方法に準じて測定した。測定は、円筒共振器のTM020モードを使用し、測定周波数11.4GHzで行った。
3.ポリイミドフィルムの線膨張係数
長さ15mm/幅3mmにサンプリングしたサンプルを、引張りモード、荷重4gf、昇温速度20℃/minで測定を行い、50℃から200℃のTMAカーブより線膨張係数(CTE)を算出した。
4.銅張積層体の剥離強度
銅張積層体の剥離強度は、JIS C6471の方法で測定した。
5.5%重量減少温度
Seiko Instruments Inc.EXSTAR TG/DTA7200(昇温速度:10℃/min、窒素あるいは空気気流下)により測定した。
s-BPDA:3,3’,4,4’-ビフェニルテトラカルボン酸二無水物
ODPA:4,4’-オキシジフタル酸無水物
PMDA:ピロメリット酸無水物
PPD:p-フェニレンジアミン
DATP:4,4’’-ジアミノ-p-ターフェニル
BAPP:2,2-ビス[4-(4-アミノフェノキシ)フェニル]プロパン
DMAc:N,N-ジメチルアセトアミド
攪拌機、窒素導入管を備えた反応容器にDMAcを加え、さらに、ジアミン成分としてPPDを加えた。続いて、テトラカルボン酸二無水物成分としてs-BPDAを、ジアミン成分とほぼ等モルとなるよう加えて反応させ、モノマー濃度が18質量%、25℃における溶液粘度が1500ポイズのポリアミック酸溶液Aを得た。
攪拌機、窒素導入管を備えた反応容器にDMAcを加え、さらに、ジアミン成分としてPPDを加えた。続いて、テトラカルボン酸二無水物成分としてs-BPDAとODPAを、ジアミン成分とほぼ等モルとなるよう加えて反応させ、モノマー濃度が18質量%、25℃における溶液粘度が1800ポイズのポリアミック酸溶液Bを得た。s-BPDAとODPAのモル比は80:20とした。
s-BPDAとODPAのモル比を70:30とした以外は、ポリアミック酸溶液Bの合成と同様にして、ポリアミック酸溶液Cを得た。
s-BPDAとODPAのモル比を50:50とした以外は、ポリアミック酸溶液Bの合成と同様にして、ポリアミック酸溶液Dを得た。
s-BPDAとODPAのモル比を40:60とした以外は、ポリアミック酸溶液Bの合成と同様にして、ポリアミック酸溶液Eを得た。
攪拌機、窒素導入管を備えた反応容器に、DMAcを加え、さらに、ジアミン成分とし
てPPDを加えた。続いて、テトラカルボン酸二無水物成分としてs-BPDAとODPAおよびPMDA、ジアミン成分とほぼ等モルとなるよう加えて反応させ、モノマー濃度が18質量%、25℃における溶液粘度が1800ポイズのポリアミック酸溶液Fを得た。s-BPDAとODPAとPMDAのモル比は60:30:10とした。
s-BPDAとODPAとPMDAのモル比を65:30:5とした以外は、ポリアミック酸溶液Fの合成と同様にして、ポリアミック酸溶液Gを得た。
攪拌機、窒素導入管を備えた反応容器に、DMAcを加え、さらに、ジアミン成分としてBAPPを加えた。続いて、テトラカルボン酸二無水物成分としてs-BPDAとPMDAを、ジアミン成分とほぼ等モルとなるよう加えて反応させ、モノマー濃度が18質量%、25℃における溶液粘度が850ポイズのポリアミック酸溶液Hを得た。s-BPDAとPMDAのモル比は20:80とした。
ポリアミック酸溶液Aをガラス板上に薄膜状にキャストし、オーブンを用いて120℃で12分加熱し、ガラス板から剥離して自己支持性フィルムを得た。この自己支持性フィルムの四辺をピンテンターで固定し、加熱炉で、150℃から450℃まで徐々に加熱し(最高加熱温度は450℃)、溶媒の除去とイミド化を行ない、厚み25μmのポリイミドフィルムAを得た。ポリイミドフィルムAの評価結果を表1に示す。
ポリアミック酸溶液Bをガラス板上に薄膜状にキャストした以外は、参考例1と同様にして、厚み25μmのポリイミドフィルムBを得た。ポリイミドフィルムBの評価結果を表1に示す。
ポリアミック酸溶液Cをガラス板上に薄膜状にキャストした以外は、参考例1と同様にして、厚み25μmのポリイミドフィルムCを得た。ポリイミドフィルムCの評価結果を表1に示す。
ポリアミック酸溶液Dをガラス板上に薄膜状にキャストした以外は、参考例1と同様にして、厚み25μmのポリイミドフィルムDを得た。ポリイミドフィルムDの評価結果を表1に示す。
ポリアミック酸溶液Eをガラス板上に薄膜状にキャストした以外は、参考例1と同様にして、厚み25μmのポリイミドフィルムEを得た。ポリイミドフィルムEの評価結果を表1に示す。
ポリアミック酸溶液Fをガラス板上に薄膜状にキャストした以外は、参考例1と同様にして、厚み25μmのポリイミドフィルムFを得た。ポリイミドフィルムFの評価結果を表1に示す。
ポリアミック酸溶液Gをガラス板上に薄膜状にキャストした以外は、参考例1と同様にして、厚み25μmのポリイミドフィルムGを得た。ポリイミドフィルムGの評価結果を表1に示す。
三層押し出しダイスから、平滑な金属製支持体の上面に、ポリアミック酸溶液H(熱融着層)-ポリアミック酸溶液C(コア層)-ポリアミック酸溶液H(熱融着層)となるように、ポリアミック酸溶液Hとポリアミック酸溶液Cを押し出して流延し、薄膜状にした。薄膜状の流延物を145℃の熱風で連続的に乾燥し、自己支持性フィルムを形成した。自己支持性フィルムを支持体から剥離した後、加熱炉で、200℃から390℃まで徐々に加熱し(最高加熱温度は390℃)、溶媒の除去とイミド化を行ない、厚み25μm(2つの熱融着層の厚みは、それぞれ4.0μmであり、コア層の厚みは17.0μm)の三層構造の熱融着性ポリイミドフィルムを得た。熱融着性ポリイミドフィルムの評価結果を表2に示す。
次に、得られた熱融着性ポリイミドフィルムの両面に銅箔(JX金属株式会社製、GHY5-93F-HA-V2、厚み12μm)を重ね合わせ、温度320℃、余熱5分、プレス圧力3MPa、プレス時間1分で熱圧着することにより、熱融着性ポリイミドフィルムの両面に銅箔が積層された銅張積層体を得た。この銅張積層体の剥離強度を表2に示す。
熱融着性ポリイミドフィルムの厚みを50μm(2つの熱融着層の厚みは、それぞれ5.7μmであり、コア層の厚みは38.6μm)とした以外は、実施例1と同様にして三層構造の熱融着性ポリイミドフィルムとその銅張積層体を得た。各評価結果を表2に示す。
三層押し出しダイスから、平滑な金属製支持体の上面に、ポリアミック酸溶液H(熱融着層)-ポリアミック酸溶液A(コア層)-ポリアミック酸溶液H(熱融着層)となるように、ポリアミック酸溶液Hとポリアミック酸溶液Aを押し出して流延し、薄膜状にした以外は、実施例1と同様にして三層構造の熱融着性ポリイミドフィルムとその銅張積層体を得た。各評価結果を表2に示す。
熱融着性ポリイミドフィルムの厚みを50μm(2つの熱融着層の厚みは、それぞれ5.7μmであり、コア層の厚みは38.6μm)とした以外は、比較例1と同様にして三層構造の熱融着性ポリイミドフィルムとその銅張積層体を得た。各評価結果を表2に示す。
(1)テトラカルボン酸成分にs-BPDAとODPAを併用することにより、フィルムの吸水率が低下する。
(2)表面に熱融着層を有する多層フィルムにおいて、コア層の吸水率が低下すると、多層フィルムの吸水率が低下するだけでなく、ε、およびtanδが小さくなる。
攪拌機および窒素導入管を備えた反応容器にDMAcを加え、さらに、ジアミン成分としてDATPを加えた。続いて、テトラカルボン酸二無水物成分としてs-BPDAを、ジアミン成分とほぼ等モルとなるよう加えて反応させ、モノマー濃度が18質量%、25℃における溶液粘度が1800ポイズのポリアミック酸溶液Iを得た。
攪拌機、窒素導入管を備えた反応容器にDMAcを加え、さらに、ジアミン成分としてPPDとDATPを加えた。続いて、テトラカルボン酸二無水物成分としてs-BPDAを、ジアミン成分とほぼ等モルとなるよう加えて反応させ、モノマー濃度が18質量%、25℃における溶液粘度が1800ポイズのポリアミック酸溶液Jを得た。PPDとDATPのモル比は50:50とした。
PPDとDATPのモル比を80:20とした以外は、ポリアミック酸溶液Jの合成と同様にして、ポリアミック酸溶液Kを得た。
攪拌機、窒素導入管を備えた反応容器にDMAcを加え、さらに、ジアミン成分としてPPDとDATPを加えた。続いて、テトラカルボン酸二無水物成分としてs-BPDAとODPAを、ジアミン成分とほぼ等モルとなるよう加えて反応させ、モノマー濃度が18質量%、25℃における溶液粘度が1800ポイズのポリアミック酸溶液Lを得た。PPDとDATPのモル比は80:20とした。s-BPDAとODPAのモル比は80:20とした。
PPDとDATPのモル比を50:50とした以外は、ポリアミック酸溶液Lの合成と同様にして、ポリアミック酸溶液Mを得た。
攪拌機、窒素導入管を備えた反応容器にDMAcを加え、さらに、ジアミン成分としてDATPを加えた。続いて、テトラカルボン酸二無水物成分としてs-BPDAとODPAを、ジアミン成分とほぼ等モルとなるよう加えて反応させ、モノマー濃度が18質量%、25℃における溶液粘度が1800ポイズのポリアミック酸溶液Nを得た。s-BPDAとODPAのモル比は70:30とした。
ポリアミック酸溶液Iをガラス板上に薄膜状にキャストした以外は、参考例1と同様にして、厚み25μmのポリイミドフィルムIを得た。ポリイミドフィルムIの評価結果を表3に示す。
ポリアミック酸溶液Jをガラス板上に薄膜状にキャストした以外は、参考例1と同様にして、厚み25μmのポリイミドフィルムJを得た。ポリイミドフィルムJの評価結果を表3に示す。
ポリアミック酸溶液Kをガラス板上に薄膜状にキャストした以外は、参考例1と同様にして、厚み25μmのポリイミドフィルムKを得た。ポリイミドフィルムKの評価結果を表3に示す。
ポリアミック酸溶液Lをガラス板上に薄膜状にキャストした以外は、参考例1と同様にして、厚み25μmのポリイミドフィルムLを得た。ポリイミドフィルムLの評価結果を表3に示す。
ポリアミック酸溶液Mをガラス板上に薄膜状にキャストした以外は、参考例1と同様にして、厚み25μmのポリイミドフィルムMを得た。ポリイミドフィルムMの評価結果を表3に示す。
ポリアミック酸溶液Nをガラス板上に薄膜状にキャストした以外は、参考例1と同様にして、厚み25μmのポリイミドフィルムNを得た。ポリイミドフィルムNの評価結果を表3に示す。
三層押し出しダイスから、平滑な金属製支持体の上面に、ポリアミック酸溶液H(熱融着層)-ポリアミック酸溶液K(コア層)-ポリアミック酸溶液H(熱融着層)となるように、ポリアミック酸溶液Hとポリアミック酸溶液Kを押し出して流延し、薄膜状にした。薄膜状の流延物を145℃の熱風で連続的に乾燥し、自己支持性フィルムを形成した。自己支持性フィルムを支持体から剥離した後、加熱炉で、200℃から390℃まで徐々に加熱し(最高加熱温度は390℃)、溶媒の除去とイミド化を行ない、厚み50μm(2つの熱融着層の厚みは、それぞれ5.7μmであり、コア層の厚みは38.6μm)の三層構造の熱融着性ポリイミドフィルムを得た。熱融着性ポリイミドフィルムの評価結果を表4に示す。
三層押し出しダイスから、平滑な金属製支持体の上面に、ポリアミック酸溶液H(熱融着層)-ポリアミック酸溶液L(コア層)-ポリアミック酸溶液H(熱融着層)となるように、ポリアミック酸溶液Hとポリアミック酸溶液Lを押し出して流延し、薄膜状にした。薄膜状の流延物を145℃の熱風で連続的に乾燥し、自己支持性フィルムを形成した。自己支持性フィルムを支持体から剥離した後、加熱炉で、200℃から390℃まで徐々に加熱し(最高加熱温度は390℃)、溶媒の除去とイミド化を行ない、厚み25μm(2つの熱融着層の厚みは、それぞれ4.0μmであり、コア層の厚みは17.0μm)の三層構造の熱融着性ポリイミドフィルムを得た。熱融着性ポリイミドフィルムの評価結果を表4に示す。
熱融着性ポリイミドフィルムの厚みを50μm(2つの熱融着層の厚みは、それぞれ5.7μmであり、コア層の厚みは38.6μm)とした以外は、実施例4と同様にして三層構造の熱融着性ポリイミドフィルムを得た。評価結果を表4に示す。
(1)テトラカルボン酸成分にs-BPDAとODPAを併用しても、さらにジアミン成分にPPDとDATPを併用しても、5%重量減少温度は低下せず、吸水率やtanδは低下する。
Claims (5)
- 耐熱性ポリイミド層の少なくとも片面に金属接着層を設けた金属積層用ポリイミドフィルムであって、
窒素雰囲気中での5%重量減少温度が500℃以上であり、
周波数11.4GHzにおける誘電正接が0.007以下である、金属積層用ポリイミドフィルム。 - 金属接着層が熱融着性ポリイミドからなる請求項1または2に記載の金属積層用ポリイミドフィルム。
- 金属接着層が耐熱性ポリイミドとシランカップリング剤からなる請求項1または2に記載の金属積層用ポリイミドフィルム。
- 請求項1ないし4のいずれか一項に記載の金属積層用ポリイミドフィルムの金属接着層を設けた面に、さらに金属層を積層したポリイミド金属積層体。
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| JP2018547780A JP6992765B2 (ja) | 2016-10-31 | 2017-10-27 | 金属積層用ポリイミドフィルム、およびこれを用いたポリイミド金属積層体 |
| CN201780063179.7A CN109843588B (zh) | 2016-10-31 | 2017-10-27 | 金属层叠用聚酰亚胺膜及使用了其的聚酰亚胺金属层叠体 |
| KR1020197008808A KR102442540B1 (ko) | 2016-10-31 | 2017-10-27 | 금속 적층용 폴리이미드 필름 및 이것을 사용한 폴리이미드 금속 적층체 |
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| JPWO2023100951A1 (ja) * | 2021-11-30 | 2023-06-08 | ||
| KR20230090330A (ko) | 2020-10-22 | 2023-06-21 | 가부시키가이샤 가네카 | 비열가소성 폴리이미드 필름, 복층 폴리이미드 필름 및 금속 피복 적층판 |
| JP2023136376A (ja) * | 2022-03-17 | 2023-09-29 | 株式会社カネカ | ポリイミド前駆体及びポリイミド |
| JP2023145925A (ja) * | 2022-03-29 | 2023-10-12 | 株式会社カネカ | 高誘電率かつ低誘電正接なポリイミドフィルム、多層ポリイミドフィルム、フレキシブル金属張積層体ならびに、フレキシブルプリント基板 |
| JP2024528482A (ja) * | 2021-06-25 | 2024-07-30 | ピーアイ・アドバンスド・マテリアルズ・カンパニー・リミテッド | 半透明低誘電ポリイミドフィルムおよびその製造方法 |
| KR20240150439A (ko) | 2022-02-24 | 2024-10-15 | 가부시키가이샤 가네카 | 폴리아미드산, 폴리이미드, 비열가소성 폴리이미드 필름, 복층 폴리이미드 필름 및 금속 피복 적층판 |
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| KR102441706B1 (ko) * | 2020-11-12 | 2022-09-07 | 한국화학연구원 | 저유전성 폴리이미드 수지 및 그 제조방법 |
| CN112940316B (zh) * | 2021-02-19 | 2022-07-29 | 上海八亿时空先进材料有限公司 | 一种聚酰亚胺薄膜及其制备方法与应用 |
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| WO2018181436A1 (ja) * | 2017-03-28 | 2018-10-04 | 東レ・デュポン株式会社 | ポリイミドフィルム |
| KR20230090330A (ko) | 2020-10-22 | 2023-06-21 | 가부시키가이샤 가네카 | 비열가소성 폴리이미드 필름, 복층 폴리이미드 필름 및 금속 피복 적층판 |
| JP2024528482A (ja) * | 2021-06-25 | 2024-07-30 | ピーアイ・アドバンスド・マテリアルズ・カンパニー・リミテッド | 半透明低誘電ポリイミドフィルムおよびその製造方法 |
| JP7733140B2 (ja) | 2021-06-25 | 2025-09-02 | ピーアイ・アドバンスド・マテリアルズ・カンパニー・リミテッド | 半透明低誘電ポリイミドフィルムおよびその製造方法 |
| JPWO2023100951A1 (ja) * | 2021-11-30 | 2023-06-08 | ||
| WO2023100951A1 (ja) * | 2021-11-30 | 2023-06-08 | Ube株式会社 | ポリイミドフィルム、高周波回路基板、フレキシブル電子デバイス基板 |
| KR20240117105A (ko) | 2021-11-30 | 2024-07-31 | 유비이 가부시키가이샤 | 폴리이미드 필름, 고주파 회로 기판, 플렉시블 전자 디바이스 기판 |
| KR20240150439A (ko) | 2022-02-24 | 2024-10-15 | 가부시키가이샤 가네카 | 폴리아미드산, 폴리이미드, 비열가소성 폴리이미드 필름, 복층 폴리이미드 필름 및 금속 피복 적층판 |
| JP2023136376A (ja) * | 2022-03-17 | 2023-09-29 | 株式会社カネカ | ポリイミド前駆体及びポリイミド |
| JP2023145925A (ja) * | 2022-03-29 | 2023-10-12 | 株式会社カネカ | 高誘電率かつ低誘電正接なポリイミドフィルム、多層ポリイミドフィルム、フレキシブル金属張積層体ならびに、フレキシブルプリント基板 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2018079710A1 (ja) | 2019-09-19 |
| KR102442540B1 (ko) | 2022-09-13 |
| TWI659830B (zh) | 2019-05-21 |
| TW201825287A (zh) | 2018-07-16 |
| US20210283882A1 (en) | 2021-09-16 |
| CN109843588A (zh) | 2019-06-04 |
| KR20190078559A (ko) | 2019-07-04 |
| CN109843588B (zh) | 2021-10-29 |
| JP6992765B2 (ja) | 2022-01-13 |
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