WO2017169297A1 - 電磁波シールドフィルム - Google Patents
電磁波シールドフィルム Download PDFInfo
- Publication number
- WO2017169297A1 WO2017169297A1 PCT/JP2017/006301 JP2017006301W WO2017169297A1 WO 2017169297 A1 WO2017169297 A1 WO 2017169297A1 JP 2017006301 W JP2017006301 W JP 2017006301W WO 2017169297 A1 WO2017169297 A1 WO 2017169297A1
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- WIPO (PCT)
- Prior art keywords
- conductive
- shielding film
- electromagnetic wave
- resin
- wave shielding
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Classifications
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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
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
- H05K9/0083—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising electro-conductive non-fibrous particles embedded in an electrically insulating supporting structure, e.g. powder, flakes, whiskers
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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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/24—Electrically-conducting paints
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/66—Additives characterised by particle size
- C09D7/69—Particle size larger than 1000 nm
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0213—Electrical arrangements not otherwise provided for
- H05K1/0215—Grounding of printed circuits by connection to external grounding means
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0213—Electrical arrangements not otherwise provided for
- H05K1/0216—Reduction of cross-talk, noise or electromagnetic interference
- H05K1/023—Reduction of cross-talk, noise or electromagnetic interference using auxiliary mounted passive components or auxiliary substances
-
- 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
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/18—Printed circuits structurally associated with non-printed electric components
- H05K1/181—Printed circuits structurally associated with non-printed electric components associated with surface mounted components
-
- 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
- H05K2201/07—Electric details
- H05K2201/0707—Shielding
- H05K2201/0715—Shielding provided by an outer layer of PCB
Definitions
- This invention relates to an electromagnetic wave shielding film.
- the conductive non-woven fabric is a non-woven fabric knitted with fibers coated with a metal thin film.
- the above-described conventional electromagnetic shielding material is provided, for example, on the mounting surface side of a wiring board (printed board) so as to cover an electronic component mounted on the printed board. Since a plurality of electronic components are mounted on the mounting surface of the wiring board, the surface of the wiring board on which the electronic components are mounted has irregularities. Since the conventional electromagnetic wave shielding material includes a conductive nonwoven fabric layer, it has almost no stretchability. For this reason, when it is provided on the surface of the wiring board on which the electronic component is mounted, a space is easily formed between the electronic component and the electromagnetic wave shielding material, so that electromagnetic wave leakage occurs and the electromagnetic wave shielding effect is reduced.
- An object of the present invention is to provide an electromagnetic wave shielding film capable of reducing a space formed between electronic components on a wiring board and enhancing an electromagnetic wave shielding effect.
- the invention according to claim 1 includes a conductive layer having extensibility, and an adhesive layer formed on one surface of the conductive layer and having insulating properties, and the conductive layer includes a resin having extensibility;
- An electromagnetic wave shielding film comprising a conductive composition containing a conductive filler filled in the resin, wherein the resin has a tensile permanent strain of 2.5% or more and 90% or less.
- the electromagnetic wave shielding film includes a conductive layer having extensibility.
- This conductive layer contains a resin having extensibility and a tensile set of 2.5% or more and 90% or less. For this reason, an electromagnetic wave shielding film has a property which has an extensibility and it is hard to return to the original once it extends.
- the electromagnetic shielding film When this electromagnetic shielding film is applied to, for example, a wiring board on which electronic components are mounted, the electromagnetic shielding film is wired so that the adhesive layer side surface faces the wiring board mounting surface and covers the electronic components. Place on the substrate. Thereby, the electromagnetic wave shielding film is temporarily fixed to the wiring board. Thereafter, the electromagnetic wave shielding film is lightly pressed against the mounting surface side of the wiring board.
- the electromagnetic shielding film is extensible and has the property of not returning to its original state once stretched, so the electromagnetic shielding film stretches and deforms along the outer surface of the electronic component on the wiring board and maintains its state. To do. Thereby, the space formed between the electronic components on the wiring board can be reduced, and the electromagnetic wave shielding effect can be enhanced.
- the invention according to claim 2 is the electromagnetic wave shielding film according to claim 1, wherein the breaking strength of the resin is 20 MPa or more and 80 MPa or less, and the breaking elongation of the resin is 300% or more and 700% or less.
- the invention according to claim 3 is the electromagnetic wave shielding film according to claim 1 or 2, further comprising an insulating layer formed on a surface of the conductive layer opposite to the adhesive layer side.
- the invention according to claim 4 is the electromagnetic wave shielding film according to any one of claims 1 to 3, wherein the conductive filler has a dendrite shape.
- the invention according to claim 5 is the electromagnetic wave shielding film according to claim 4, wherein the conductive filler is silver powder.
- the invention according to claim 6 is the electromagnetic wave shielding film according to claim 4, wherein the conductive filler is copper powder.
- the invention according to claim 7 is the electromagnetic wave shielding film according to claim 4, wherein the conductive filler is silver-coated copper powder in which silver is coated on copper powder.
- the invention according to claim 8 is the electromagnetic wave shielding film according to any one of claims 1 to 3, wherein the conductive filler has a coil shape.
- FIG. 1 is a schematic cross-sectional view showing a configuration of an electromagnetic wave shielding film according to an embodiment of the present invention.
- 2A is a schematic cross-sectional view showing a manufacturing process of the electromagnetic wave shielding film of FIG. 1
- FIG. 2B is a schematic cross-sectional view showing a process subsequent to FIG. 2A.
- 3A and 3B are schematic cross-sectional views for explaining a method of using the electromagnetic wave shielding film of FIG.
- FIG. 4 is a schematic cross-sectional view illustrating an example of a method for grounding the conductive layer of the electromagnetic wave shielding film.
- FIG. 1 is a schematic cross-sectional view showing the configuration of the electromagnetic shielding film according to the embodiment of the present invention.
- the electromagnetic wave shielding film 1 includes an insulating layer (protective layer) 2 having electrical insulating properties, and a conductive layer 3 formed on one surface of the insulating layer 2 and having a property of being stretchable and difficult to return to the original state once stretched. And an adhesive layer 4 having insulating properties formed on the surface of the conductive layer 3 opposite to the insulating layer 2 side.
- the electromagnetic wave shielding film 1 has a sheet shape. Having extensibility means having a property of being easily stretched.
- the thickness of the insulating layer 2 is about 5 to 50 ⁇ m.
- the thickness of the conductive layer 3 is about 10 to 100 ⁇ m.
- the thickness of the adhesive layer 4 is about 10 to 150 ⁇ m.
- Adhesive layer As the adhesive layer 4, for example, a pressure-sensitive adhesive layer, a hot-melt adhesive layer, or the like can be used.
- Examples of the material of the pressure-sensitive adhesive used for the pressure-sensitive adhesive layer as the adhesive layer 4 include rubber-based, acrylic-based, polyester-based, silicone-based, and urethane-based materials.
- the material of the hot melt adhesive used for the hot melt adhesive layer as the adhesive layer 4 includes thermoplastic resins such as polyester, polyurethane, polyamide, olefin, and ethylene vinyl acetate.
- the hot melt adhesive in the invention preferably has a melting point of 130 ° C. or lower, a durometer hardness of 95 A or lower, and a breaking elongation of 300% or higher, a melting point of 120 ° C. or lower, a durometer hardness of 85 A or lower, and a breaking elongation.
- the degree is more preferably 500% or more. More specifically, as the hot melt adhesive, a polyurethane-based thermoplastic resin such as a product name “SHM101-PUR” manufactured by Seadam Co., Ltd. can be used.
- a polyurethane-based thermoplastic resin such as a product name “SHM101-PUR” manufactured by Seadam Co., Ltd. can be used.
- Conductive layer 3 is composed of a resin having stretchability and a property that does not easily return to the original state once stretched (hereinafter referred to as “resin for conductive layer”), and the conductive filled in the resin. It is comprised from the electroconductive composition containing a conductive filler.
- the tensile permanent strain of the conductive layer resin is preferably 2.5% or more and 90% or less, and more preferably 20% or more and 80% or less.
- the conductive layer 3 has a property of being stretchable and difficult to return to the original state once stretched, and after being stretched once. It preferably has a slightly returning property. If the tensile permanent strain of the resin for the conductive layer is less than 2.5%, it is difficult for the conductive layer 3 to exhibit the property that it is difficult to return to the original state once it is stretched. If it exceeds 90%, the conductive layer 3 is once stretched once. This is because it is easy to exhibit the property of being difficult to return, but it is difficult to exhibit the property of returning slightly after being stretched once.
- the breaking strength of the conductive layer resin is preferably 20 MPa or more and 80 MPa or less. Moreover, it is preferable that the breaking elongation of the resin for conductive layers is 300% or more and 700% or less. Moreover, it is preferable that the Shore A intensity
- Resin for conductive layer The resin for conductive layer is composed of an elastomer, a thermoplastic resin, or the like.
- the elastomer used as the conductive layer resin is a resin having elasticity such as, for example, a styrene elastomer, an olefin elastomer, a polyester elastomer, a polyurethane elastomer, a polyamide elastomer, a silicone elastomer, or the like.
- Polyurethane elastomer consists of hard segment and soft segment. Soft segment includes carbonate, ester, ether, etc.
- Physical properties are 20-80MPa breaking strength, 300-700% breaking elongation, tensile permanent strain Is preferably 2.5 to 90%, more preferably has a breaking strength of 30 to 70 MPa, a breaking elongation of 400 to 600%, and a tensile set of 20 to 80%.
- NE-8880, MAU-9022, NE-310, NE-302HV, CU-8448, etc. manufactured by Dainichi Seika Kogyo Co., Ltd. can be used.
- DIC Corporation Pandex 372E can be used as a polyurethane-type elastomer.
- the elastomer may be composed of a single resin or may include a plurality of types of resins. Elastomers are plasticizers, processing aids, crosslinking agents, vulcanization accelerators, vulcanization aids, anti-aging agents, softening agents, and colorants from the viewpoint of improving manufacturability (workability) and flexibility. Etc. may be contained.
- Table 1 shows the physical properties of comparative examples and examples of resin for conductive layers.
- the resin for conductive layers of the comparative example is composed of a urethane elastomer.
- the resin for conductive layers of Examples 1, 2, and 3 is made of a urethane elastomer.
- the breaking strength [MPa] is a tensile stress immediately before breaking.
- the elongation at break [%] is the elongation immediately before the break.
- the method for measuring the breaking strength and breaking elongation conforms to JIS K6251: 2010 (vulcanized rubber and thermoplastic rubber—how to obtain tensile properties), and details will be described later.
- the measuring method of the tensile permanent strain [%] is based on JIS K6273: 2006 (vulcanized rubber and thermoplastic rubber—how to obtain tensile permanent strain, elongation rate and creep rate), and details will be described later.
- Test pieces having a length of 20 mm, a width of 15 mm, and a thickness of 40 ⁇ 5 ⁇ m are prepared in advance for each of the comparative example, the example 1, the example 2, and the example 3. Attach the specimen to the tensile strain holder. And it pulls until a test piece cuts at a speed of 200 mm / min. The load and elongation rate immediately before the test piece is cut are determined as the breaking strength and breaking elongation, respectively.
- Test pieces having a length of 20 mm, a width of 15 mm, and a thickness of 40 ⁇ 5 ⁇ m are prepared in advance for each of the comparative example, the example 1, the example 2, and the example 3. Attach the specimen to the tensile strain holder. Then, the length corresponding to an elongation rate of 200% is extended at a speed of 200 mm / min (the test piece is extended to 60 mm. The state where the test piece is extended to 60 mm is held for 10 minutes. Thereafter, the test piece is held at a tensile strain holder. The test piece is allowed to stand for 30 minutes in a state where the tensile force is released, and the length of the test piece (the length of the test piece after contraction) is measured when 30 minutes have elapsed.
- the tensile permanent set TS is expressed by the following equation (1).
- the TS ⁇ (L2-L0) / (L1-L0) ⁇ ⁇ 100 (1)
- the conductive layer resins of Examples 1, 2, and 3 exhibited the property of being easily stretched when pulled and not easily returned to the original state once stretched.
- the resin for the conductive layer of the comparative example exhibited a property that it was difficult to stretch and was easily broken when stretched.
- the tensile permanent strain of the resin for the conductive layer is preferably 2.5% or more and 90% or less, It can be estimated that it is more preferably 20% or more and 80% or less. Further, it can be estimated that the breaking strength of the conductive layer resin is preferably 20 MPa or more and 80 MPa or less, and the breaking elongation of the conductive layer resin is preferably 300% or more and 700% or less.
- the shape of the conductive filler may be a dendrite shape, a coil shape, a lump shape, a spherical shape, a flake shape, a needle shape, a fiber shape, or the like.
- the dendritic shape refers to a shape in which a rod-shaped branch branch extends in a two-dimensional direction or a three-dimensional direction from a rod-shaped main branch.
- the dendritic shape includes a shape in which the branch branch is bent in the middle and a shape in which a rod-shaped branch branch extends from the middle of the branch branch.
- the dendritic conductive filler will be described in detail.
- the dendritic conductive filler may be, for example, dendritic copper powder or silver powder, and silver-coated copper powder or dendritic copper powder obtained by coating silver on dendritic copper powder is coated with gold. Gold-coated copper powder may be used.
- the conductive filler is made of dendritic silver-coated copper powder, the conductive filler has a resistance value close to that of the conductive filler made of silver, and has excellent conductivity and migration resistance, although it is relatively inexpensive. Can be realized. Further, when the conductive filler is made of dendritic copper powder, a conductive filler having a low resistance value can be realized while being inexpensive.
- the conductive filler is made of dendritic silver-coated copper powder
- a polyurethane elastomer as the elastomer.
- the polyurethane elastomer has a volume resistivity of 10 10 to 13 ⁇ cm, is about 2 digits lower than other elastomers, and has a high affinity for the conductive filler containing silver.
- the composition can be satisfactorily stretched.
- the lower limit of the average particle diameter of the conductive filler is 1 ⁇ m, preferably 2 ⁇ m. When the lower limit is 1 ⁇ m or more, the conductive fillers are easily brought into contact with each other, and the conductivity of the conductive composition is improved.
- the upper limit of the average particle size of the conductive filler is 20 ⁇ m, preferably 10 ⁇ m. When the upper limit is 20 ⁇ m or less, the thickness of the conductive layer made of the conductive composition can be reduced. If the conductive filler is a coil shape (including a spiral shape and a spiral shape), when the elastomer is stretched, the conductive filler is stretched as when the coil is pulled. Therefore, even when the elastomer is stretched, an increase in the resistance value of the conductive composition can be suppressed. Thereby, the electroconductive composition which has extensibility and can suppress the increase in the resistance value at the time of extension can be provided.
- the filling rate of the conductive filler in the conductive composition (conductive layer 3) is preferably 60% by mass or more and 90% by mass or less.
- the conductive paste used for forming the conductive layer 3 can be manufactured, for example, as follows. For example, a dendritic silver-coated copper powder having an average particle diameter of 5 ⁇ m is used as the conductive layer resin, and the filling rate of the silver-coated copper powder (the filling rate of the conductive filler in the conductive composition) is a predetermined mass% (for example, 80 (Mass%).
- FIGS. 2A and 2B are process diagrams showing a method for producing the electromagnetic shielding film 1.
- FIGS. 3A and 3B are schematic cross-sectional views for describing the method of using the electromagnetic wave shielding film.
- a plurality of types of electronic components 11 to 14 are mounted on the mounting surface side of the wiring board 10 (see FIG. 3A). The heights of these electronic components 11 to 14 are not uniform. As shown in FIG. 3A, the electromagnetic wave shielding film 1 is placed on the wiring board 10 so that the surface of the adhesive layer 4 faces the mounting surface of the wiring board 10 and covers the electronic components 11 to 14. Thereby, the electromagnetic wave shielding film 1 is fixed to the wiring board 10.
- the electromagnetic wave shielding film 1 is lightly pressed against the mounting surface side of the wiring board 10 with a jig made of flexible rubber or the like. Then, since the electromagnetic wave shielding film 1 has the conductive layer 3 which has the extensibility and has the property that it is difficult to return to the original state once stretched, as shown in FIG. It is deformed along the outer surfaces (upper surface and side surface) of the upper electronic components 11 to 14, and the state is maintained. Thereby, the space formed between the electronic components 11 to 14 on the wiring board 10 can be reduced, and the electromagnetic wave shielding effect can be enhanced.
- a through hole 2 a reaching the conductive layer 3 from the surface is formed in the insulating layer 2, and a pad 5 electrically connected to the conductive layer 3 is formed on the insulating layer 2.
- 5 may be grounded via the wiring 6.
- the position of the pad 5 may be arbitrary, and may be the upper part covered with the electromagnetic wave shielding film 1 on the electronic component. Further, the ground may not be a dedicated wiring for the ground but may be a casing of the electronic device.
- the electromagnetic wave shielding film 1 includes the insulating layer 2, the conductive layer 3 formed on one surface of the insulating layer 2, the stretchable property, and the property that it is difficult to return to the original state once stretched. 3 is formed of an adhesive layer 4 having insulating properties formed on the surface opposite to the insulating layer 2 side.
- the insulating layer 2 may not be formed.
- various design changes can be made within the scope of matters described in the claims.
- Electromagnetic wave shielding film 2 Insulating layer 3 Conductive layer 4 Adhesive layer
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Abstract
Description
この構成では、電磁波シールドフィルムは、伸張性を有する導電層を含んでいる。この導電層は、伸張性を有しかつ引張永久ひずみが2.5%以上90%以下である樹脂を含んでいる。このため、電磁波シールドフィルムは、伸張性を有しかつ一度伸びると元に戻りにくい性質を有する。
請求項3に記載の発明は、前記導電層における前記接着剤層側とは反対側の表面に形成された絶縁層をさらに含む、請求項1または2に記載の電磁波シールドフィルムである。
請求項5に記載の発明は、前記導電性フィラーが銀粉である、請求項4に記載の電磁波シールドフィルムである。
請求項7に記載の発明は、前記導電性フィラーが、銅粉に銀がコーティングされた、銀コート銅粉である、請求項4に記載の電磁波シールドフィルムである。
請求項8に記載の発明は、前記導電性フィラーがコイル形状である、請求項1~3のいずれか一項に記載の電磁波シールドフィルムである。
図1は、この発明の実施形態に係る電磁波シールドフィルムの構成を示す模式的な断面図である。
電磁波シールドフィルム1は、電気絶縁性を有する絶縁層(保護層)2と、絶縁層2の一表面に形成され、伸張性を有しかつ一度伸びると元に戻りにくい性質を有する導電層3と、導電層3における絶縁層2側とは反対側の表面に形成された絶縁性を有する接着剤層4とを含んでいる。電磁波シールドフィルム1は、シート状である。伸張性を有するとは、伸びやすい性質を有することをいう。
[2]接着剤層
接着剤層4としては、たとえば、粘着剤層、ホットメルト接着剤層等を用いることができる。
接着剤層4としてのホットメルト接着剤層に使用されるホットメルト接着剤の材質としては、ポリエステル系、ポリウレタン系、ポリアミド系、オレフィン系、エチレン酢酸ビニル系等の熱可塑性樹脂があるが、本発明におけるホットメルト接着剤としては、融点が130℃以下、デュロメータ硬さが95A以下、破断伸度が300%以上であるのが好ましく、融点が120℃以下、デュロメータ硬さが85A以下、破断伸度が500%以上であるのがより好ましい。ホットメルト接着剤として、より具体的には、シーダム株式会社製の製品名「SHM101-PUR」等のポリウレタン系熱可塑性樹脂を用いることができる。
[3]導電層
導電層3は、伸張性を有しかつ一度伸びると元に戻りにくい性質を有する樹脂(以下、「導電層用樹脂」という。)と、当該樹脂中に充填されている導電性フィラーとを含む導電性組成物から構成される。
[3-1]導電層用樹脂
導電層用樹脂は、エラストマー、熱可塑性樹脂等から構成される。導電層用樹脂として用いられるエラストマーは、例えば、スチレン系エラストマー、オレフィン系エラストマー、ポリエステル系エラストマー、ポリウレタン系エラストマー、ポリアミド系エラストマー、シリコーン系エラストマー等の弾性力を有する樹脂である。ポリウレタン系エラストマーはハードセグメントとソフトセグメントから構成され、ソフトセグメントとしては、カーボネート、エステル、エーテル等があり、物性としては、破断強度が20~80MPa、破断伸度が300~700%、引張永久ひずみが2.5~90%であるのが好ましく、破断強度が30~70MPa、破断伸度が400~600%、引張永久ひずみが20~80%であるのがより好ましい。
破断強度[MPa]は、破断直前の引張応力である。破断伸度[%]は、破断直前の伸びである。破断強度および破断伸度の測定方法は、JIS K6251:2010(加硫ゴム及び熱可塑性ゴム-引張特性の求め方)に準拠しており、詳細は後述する。引張永久ひずみ[%]の測定方法は、JIS K6273:2006(加硫ゴム及び熱可塑性ゴム-引張永久ひずみ、伸び率及びクリープ率の求め方)に準拠しており、詳細は後述する。
予め、比較例、実施例1、実施例2および実施例3毎に、長さ20mm、幅15mmおよび厚み40±5μmの試験片を用意しておく。試験片を引張歪保持具に取り付ける。そして、200mm/minの速度で試験片が切れるまで引っ張る。試験片が切れる直前の荷重および伸張率を、それぞれ破断強度および破断伸度として求める。
予め、比較例、実施例1、実施例2および実施例3毎に、長さ20mm、幅15mmおよび厚み40±5μmの試験片を用意しておく。
試験片を引張歪保持具に取り付ける。そして、200mm/minの速度で伸張率200%に相当する長さ(60mmまで試験片を伸張する。試験片を60mmに伸張した状態を10分間保持する。この後、試験片を引張歪保持具から取り外し、引っ張り力が解放された状態で試験片を30分間静置する。この30分が経過したときに、試験片の長さ(収縮後の試験片の長さ)を測定する。
TS={(L2-L0)/(L1-L0)}×100 …(1)
実施例1,2,3の導電層用樹脂は、引っ張ると伸びやすく、かつ一度伸ばすと元に戻りにくい性質を呈した。これに対し、比較例の導電層用樹脂は、伸びにくくかつ伸ばすと破断しやすい性質を呈した。
[3-2]導電性フィラー
導電性フィラーの形状は、デンドライト状、コイル形状、塊状、球状、フレーク状、針状、繊維状等であってもよい。デンドライト状とは、棒状の主枝から棒状の分岐枝が2次元方向または3次元方向に延びた形状をいう。また、デンドライト状には、前記分岐枝が途中で折れ曲がった形状や、前記分岐枝の途中からさらに棒状の分岐枝が延びている形状も含まれる。
導電性フィラーがコイル形状(螺旋形状、スパイラル形状含む)であれば、エラストマーが伸張した場合、導電性フィラーはコイルが引っ張られたときにように伸びる。したがって、エラストマーが伸張した場合においても、導電性組成物の抵抗値の増加を抑制することができる。これにより、伸張性を有しかつ伸張時における抵抗値の増加を抑制できる導電性組成物を提供できる。
[3-3]導電性ペースト
導電層3を形成するために用いられる導電性ペーストは、たとえば、次のようにして製造できる。導電層用樹脂に、たとえば、平均粒径5μmでデンドライト状の銀コート銅粉を、銀コート銅粉の充填率(導電性組成物における導電性フィラーの充填率)が所定の質量%(例えば80質量%)となるように配合した。次いで、導電層用樹脂100質量部に対して、イソプロピルアルコールとトルエンとの混合溶媒(イソプロピルアルコールとトルエンの重量比が例えば5:5)を例えば40質量部添加し、遊星攪拌機によって撹拌した。これにより、導電層用樹脂と銀コート銅粉と有機溶剤とを含む溶液(導電性ペースト)を得た。なお、デンドライト状の銀コート銅粉の代わりに、デンドライト状の銀粉等のデンドライト状の導電性フィラー、コイル形状導電性フィラー等を用いることができるのは言うまでもない。
[4]絶縁層
絶縁層2としては、例えば、前述した導電層用樹脂で使用しているエラストマーに、カーボンブラックを充填したものを用いることができ、同様に、可塑剤、加工助剤、架橋剤、加硫促進剤、加硫助剤、老化防止剤、軟化剤、着色剤等の添加剤を含んでいてもよい。
[5]電磁波シールドフィルムの製造方法
図2Aおよび図2Bは、電磁波シールドフィルム1の製造方法を示す工程図である。
[6]電磁波シールドフィルムの使用方法の説明
図3Aおよび図3Bは、電磁波シールドフィルムの使用方法を説明するための図解的な断面図である。
その他、特許請求の範囲に記載された事項の範囲で種々の設計変更を施すことが可能である。
2 絶縁層
3 導電層
4 接着剤層
Claims (8)
- 伸張性を有する導電層と、
前記導電層の一表面に形成され、絶縁性を有する接着剤層とを含み、
前記導電層は、伸張性を有する樹脂と、前記樹脂中に充填されている導電性フィラーとを含む導電性組成物から構成されており、
前記樹脂の引張永久ひずみが2.5%以上90%以下である、電磁波シールドフィルム。 - 前記樹脂の破断強度が20MPa以上80MPa以下であり、前記樹脂の破断伸度が300%以上700%以下である、請求項1に記載の電磁波シールドフィルム。
- 前記導電層における前記接着剤層側とは反対側の表面に形成された絶縁層をさらに含む、請求項1または2に記載の電磁波シールドフィルム。
- 前記導電性フィラーがデンドライト状である、請求項1~3のいずれか一項に記載の電磁波シールドフィルム。
- 前記導電性フィラーが銀粉である、請求項4に記載の電磁波シールドフィルム。
- 前記導電性フィラーが銅粉である、請求項4に記載の電磁波シールドフィルム。
- 前記導電性フィラーが、銅粉に銀がコーティングされた、銀コート銅粉である、請求項4に記載の電磁波シールドフィルム。
- 前記導電性フィラーがコイル形状である、請求項1~3のいずれか一項に記載の電磁波シールドフィルム。
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| US16/087,698 US11812543B2 (en) | 2016-03-31 | 2017-02-21 | Electromagnetic wave shielding film |
| KR1020187028540A KR102564763B1 (ko) | 2016-03-31 | 2017-02-21 | 전자파 차폐 필름 |
| EP17773845.7A EP3439447A4 (en) | 2016-03-31 | 2017-02-21 | SHIELDING SHEET FOR ELECTROMAGNETIC WAVES |
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| KR102820004B1 (ko) | 2019-06-17 | 2025-06-13 | 삼성디스플레이 주식회사 | 표시 장치 및 표시 장치의 제조 방법 |
| KR102047831B1 (ko) | 2019-07-09 | 2019-11-22 | 한국생산기술연구원 | 전자파 차폐 기능 및 방열 기능을 갖는 액체 금속 입자 코팅 시트 부재 및 그 제조 방법 |
| KR20210007103A (ko) | 2019-07-10 | 2021-01-20 | 한국생산기술연구원 | 액체 금속 입자를 포함하는 필름 부재 |
| CN112654129B (zh) * | 2019-10-10 | 2021-11-16 | 庆鼎精密电子(淮安)有限公司 | 抗电磁干扰电路板及其制作方法 |
| CN120417357B (zh) * | 2025-05-14 | 2025-12-02 | 北京魁冠科技有限公司 | 一种电磁屏蔽罩及线路板 |
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| EP3439447A4 (en) | 2019-11-27 |
| TWI707629B (zh) | 2020-10-11 |
| JP2017183644A (ja) | 2017-10-05 |
| US11812543B2 (en) | 2023-11-07 |
| KR20180127386A (ko) | 2018-11-28 |
| KR102564763B1 (ko) | 2023-08-07 |
| TW201811158A (zh) | 2018-03-16 |
| EP3439447A1 (en) | 2019-02-06 |
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| US20190098742A1 (en) | 2019-03-28 |
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