WO2019124936A1 - 전자파 흡수 필름 및 이를 포함하는 전자파 흡수형 복합기판 - Google Patents
전자파 흡수 필름 및 이를 포함하는 전자파 흡수형 복합기판 Download PDFInfo
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- WO2019124936A1 WO2019124936A1 PCT/KR2018/016125 KR2018016125W WO2019124936A1 WO 2019124936 A1 WO2019124936 A1 WO 2019124936A1 KR 2018016125 W KR2018016125 W KR 2018016125W WO 2019124936 A1 WO2019124936 A1 WO 2019124936A1
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- layer
- electromagnetic wave
- wave absorbing
- film
- resin
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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
- H05K9/0075—Magnetic shielding materials
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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
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
-
- 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
- B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
- B32B27/281—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polyimides
-
- 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
-
- 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
- H05K1/0218—Reduction of cross-talk, noise or electromagnetic interference by printed shielding conductors, ground planes or power plane
-
- 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
- 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
- H05K9/0084—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising a single continuous metallic layer on an electrically insulating supporting structure, e.g. metal foil, film, plating coating, electro-deposition, vapour-deposition
Definitions
- the present invention relates to an electromagnetic wave absorbing film and an electromagnetic wave absorbing composite substrate including the electromagnetic wave absorbing film. More particularly, the present invention relates to an electromagnetic wave absorbing film which absorbs and shields an electromagnetic field generated from various parts of a terminal body, And the coverlay layer are integrated with each other to ensure the simplicity and economical efficiency of the manufacturing process, and an electromagnetic wave absorbing composite substrate including the electromagnetic wave absorbing film.
- digitizers such as smart phones with pen tablet functions
- Such a digitizer can draw a line of about 0.7mm thick with a pen, so it is more precise than a capacitive touch panel that recognizes a 3-4mm thickness, so it can be done with ease.
- the tablet function includes a digitizer panel on the lower side of the touch screen / display panel.
- the digitizer panel is a thin metal film.
- a thin electromagnetic field is created.
- a small metal coil And an AC magnetic field is generated at the time of use. Therefore, when the end of the electronic pen approaches the touch screen, electromagnetic induction phenomenon occurs, and the digitizer panel disposed on the lower side of the touch screen / display panel is deformed in the electromagnetic field that has already been formed. It is interpreted as the motion of the pen.
- Such a tablet function is applied not only to a small portable terminal such as a smart phone but also to a large-sized tablet PC having a large display.
- a magnetic field absorption / shielding sheet for absorbing and shielding electromagnetic fields generated from various parts of the portable terminal device body is used between the digitizer panel and the main circuit board.
- the conventional magnetic field absorption film is manufactured using a magnetic powder and a binder resin.
- the magnetic permeability is low and the sensitivity is lowered.
- the magnetic-field-absorbing film is provided with a different base material on one or both surfaces thereof, and the adhesive strength between the base material and the other base materials such as the coverlay film and / or the protective film is low and a separate adhesive layer is required.
- the thickness of the magnetic field absorbing film becomes thick, so that it is difficult to cope with the tendency of the terminal to be thinned.
- the present invention has been conceived to solve the above-mentioned problems, and it is an object of the present invention to provide an electromagnetic wave absorbing film in which an electromagnetic wave absorbing layer and a cover layer are integrated, And an electromagnetic wave absorbing composite substrate comprising the electromagnetic wave absorbing film.
- the electromagnetic wave absorbing film can reduce the cost and simplify the manufacturing process.
- an electromagnetic wave absorber comprising: an electromagnetic wave absorbing layer; And a first base layer and a second base layer disposed on one surface and the other surface of the electromagnetic wave absorbing layer, respectively, wherein the first base layer, the second base layer, and the electromagnetic wave absorbing layer sandwiched therebetween,
- one of the first base layer and the second base layer comprises a polymer film layer; An adhesive layer; And a releasing layer sequentially laminated on the polymer film layer, wherein a peel strength value of the electromagnetic wave absorbing layer with respect to the polymer film layer is 0.5 kgf / cm or more.
- the present invention also relates to an electromagnetic wave absorber layer; And a first base layer and a second base layer disposed on one surface and the other surface of the electromagnetic wave absorbing layer, respectively, wherein the first base layer, the second base layer, and the electromagnetic wave absorbing layer sandwiched therebetween, Wherein one of the first base layer and the second base layer comprises a polymer film layer; An adhesive layer; And a releasing layer are sequentially laminated, wherein the electromagnetic wave absorbing film has a permeability of 3 MHz and a permeability at a frequency of 100 kHz or more and 200 kHz or less of 70 or more.
- an electromagnetic wave absorber comprising: an electromagnetic wave absorbing layer; And a first base layer and a second base layer disposed on one surface and the other surface of the electromagnetic wave absorbing layer, respectively, wherein the first base layer, the second base layer, and the electromagnetic wave absorbing layer sandwiched therebetween, Wherein one of the first base layer and the second base layer comprises a polymer film layer; An adhesive layer; Wherein the electromagnetic wave absorbing film is a coverlay layer in which a release layer is sequentially laminated and a measurement time from blistering to the surface of the electromagnetic wave absorbing film in a 288 ⁇ ⁇ water bath is 60 seconds or more. to provide.
- the present invention provides an electromagnetic wave absorptive composite substrate on one surface of which the electromagnetic wave absorbing film is laminated.
- the electromagnetic wave absorbing composite substrate includes a non-magnetic substrate having a copper foil layer; And an electromagnetic wave absorbing film disposed on one surface of the nonmagnetic substrate, wherein the adhesive layer of the coverlay layer located on one surface of the electromagnetic wave absorbing film and the copper foil layer of the nonmagnetic substrate are in close contact with each other, .
- the electromagnetic wave absorbing film in which the electromagnetic wave absorbing layer and the cover layer are integrated can satisfy the thickness reduction of the terminal according to the reduction in thickness, and can be easily manufactured by applying the roll-to- And the reduction of the process cost due to the increase of the yield can be achieved.
- the composition of the electromagnetic wave absorbing layer by optimally mixing the composition of the electromagnetic wave absorbing layer, high permeability, high adhesive strength, and improved crack characteristics can be secured, and reliability can be secured by applying a heat resistant resin over the entire layer of the electromagnetic wave absorbing film.
- the electromagnetic wave absorbing film according to the present invention can be used in a terminal device to simultaneously impart high permeability, slimming effect, and heat durability.
- 1 to 3 are schematic views showing cross sections of an electromagnetic wave absorbing film according to an embodiment of the present invention.
- FIG. 4 is a schematic cross-sectional view of an electromagnetic wave-absorbing composite substrate according to an embodiment of the present invention.
- FIG. 5 is a schematic view showing a cross section of an electromagnetic wave absorptive composite substrate according to an embodiment of the present invention.
- release layer 30 non-coverlay layer
- 31a first polymer base material 31b: first pressure sensitive adhesive layer
- an electromagnetic wave absorbing film in which an electromagnetic wave absorbing layer and a coverlay layer are integrated.
- the coverlay refers to a polymer film layer, for example, a composite film on which an adhesive is coated on a polyimide film, or a release film.
- This coverlay layer is mainly used to protect and insulate exposed surfaces of etched FPCB (Flexible Printed Circuit Board) circuits.
- FIG. 1 to 3 schematically show a cross-sectional structure of an electromagnetic wave absorbing film according to the present invention.
- FIGS. 1 and 2 are cross-sectional views schematically showing a cross-section of an electromagnetic wave-absorbing film 100 according to an embodiment of the present invention.
- FIGS. 2 and 3 are cross- 120, respectively.
- the electromagnetic wave absorbing film 100 includes an electromagnetic wave absorbing layer 10; And a first base layer (20) and a second base layer (30) disposed on one surface and the other surface of the electromagnetic wave absorbing layer (10), respectively.
- the first base layer (20), the electromagnetic wave absorbing layer And the second base layer 30 are integrally formed.
- either the first base layer 20 or the second base layer 30 is a coverlay layer.
- the electromagnetic wave absorbing film 100 may be manufactured by a roll-to-roll continuous method, for example, an electromagnetic wave absorbing layer 10;
- the first base layer and the second base layer 20 disposed on the upper and lower portions of the electromagnetic wave absorbing layer 10 may be integrally formed in a roll shape continuous in the longitudinal direction.
- the electromagnetic wave absorbing layer The electromagnetic wave absorbing layer
- the electromagnetic wave absorbing layer (10) includes a (soft) magnetic material and functions to absorb and shield electromagnetic waves that enter or radiate into electronic equipment. And exhibits an adhesive force with other substrates (e.g., 20 and 30), heat resistance, and interlaminar adhesion.
- the electromagnetic wave absorbing layer 10 may be in the form of an insulating layer or a film or sheet and may include a conventional soft magnetic powder 11 and a polymer resin 12 known in the art.
- a polymer resin 12 known in the art.
- a polymeric magnet sheet (PMS) can be used.
- the soft magnetic powder (11) is not particularly limited as long as it is a component that absorbs and shields electromagnetic waves by being magnetized.
- Non-limiting examples of usable soft magnetic powders include ferrite, iron, carbonyl iron, permalloy, Fe-Ni, Fe-Ni-Mo, sendust, Fe- Si alloy, Fe-Si-Cr, Fe-Si, Alperm, Fe-Al, permendur, Fe-Co, , Fe-Cr-Ni). These may be used alone or in combination of two or more.
- the size and shape of the soft magnetic powder (11) are not particularly limited and can be appropriately adjusted within the ordinary range known in the art.
- the average particle diameter of the magnetic powder may be 10 ⁇ to 15.0 ⁇ , and preferably 35 ⁇ to 65 ⁇ .
- the average particle size may be a particle size based on D 50 .
- the polymeric resin 12 may be any conventional thermosetting resin known in the art without limitation.
- Non-limiting examples of usable thermosetting resins include epoxy resins, polyurethane resins, phenol resins, melamine resins, silicone resins, urea resins, vegetable rubidic phenolic resins, xylene resins, guanamine resins, diallyl phthalate resins, vinyl esters And may be at least one selected from the group consisting of a resin, an unsaturated polyester resin, a furan resin, a polyimide resin, a cyanate resin, a maleimide resin and a benzocyclobutene resin.
- it is an epoxy resin, a phenol resin, a melamine resin, a silicone resin, a urethane resin, or a urea resin.
- the double epoxy resin is preferable because it has excellent reactivity and heat resistance, and more preferably it is a halogen-free epoxy resin which does not contain a halogen element such as bromine (Br) in the molecule.
- the epoxy resin may be any conventional epoxy resin known to those skilled in the art. It is preferable that two or more epoxy groups are present in the molecule without containing a halogen element.
- examples of usable epoxy resins include, but are not limited to, bisphenol A type / F type / S type resin, novolak type epoxy resin, alkylphenol novolak type epoxy resin, biphenyl type, aralkyl type, naphthol Naphthol type, dicyclopentadiene type, or mixed form thereof.
- epoxy resins such as bisphenol A type epoxy resin, bisphenol F type epoxy resin, bisphenol S type epoxy resin, naphthalene type epoxy resin, anthracene epoxy resin, biphenyl type epoxy resin, tetramethyl biphenyl type epoxy resin, Cresol novolak type epoxy resin, bisphenol A novolak type epoxy resin, bisphenol S novolak type epoxy resin, biphenyl novolac type epoxy resin, naphthol novolak type epoxy resin, naphthol phenol coaxial novolak type epoxy resin , Naphthol cholizole co-novolak type epoxy resin, aromatic hydrocarbon formaldehyde resin modified phenol resin type epoxy resin, triphenyl methane type epoxy resin, tetraphenyl ethane type epoxy resin, dicyclopentadiene phenol addition reaction type epoxy resin, phenol aral A quarternary epoxy resin, a polyfunctional phenol resin, a naphthol aralkyl type epoxy resin There is. At this time,
- the electromagnetic wave absorptive layer (10) further contains a thermoplastic resin, whereby it is possible to obtain effects such as improvement in adhesion, improvement in flexibility, and relaxation of thermal stress.
- thermoplastic resin a conventional thermoplastic resin, a thermoplastic rubber, or both may be used.
- thermoplastic resins that can be used include polyolefins such as polyethylene, polypropylene, polystyrene, polyimide, PTFE, acrylonitrile-butadiene rubber (NBR), styrene butadiene rubber (SBR), acrylonitrile-butadiene- (ABS), carboxyl-terminated butadiene acrylonitrile rubber (CTBN), polybutadiene, styrene-butadiene-ethylene resin (SEBS), side chain having 1 to 8 carbon atoms Acrylic acid and / or methacrylic acid ester resin (acrylic rubber), or a mixture of at least one of these resins.
- polyolefins such as polyethylene, polypropylene, polystyrene, polyimide, PTFE, acrylonitrile-butadiene rubber (NBR), styrene butadiene rubber (SBR), acrylonitrile-butadiene- (ABS), carboxyl-termin
- thermoplastic resin preferably contains a functional group capable of reacting with an epoxy resin which is a thermosetting resin. Specifically, it is at least one functional group selected from the group consisting of an amino group, a carboxyl group, an epoxy group, a hydroxyl group, a methoxy group, and an isocyanate group. These functional groups form a strong bond with the epoxy resin and are therefore preferred since they have improved heat resistance after curing. Particularly, in the present invention, it is more preferable to use an acrylonitrile-butadiene copolymer (NBR) in consideration of adhesiveness, flexibility and effect of alleviating thermal stress. Such a copolymer preferably contains a functional group capable of reacting with an epoxy resin.
- NBR acrylonitrile-butadiene copolymer
- the functional group include an amino group, a carboxyl group, an epoxy group, a hydroxyl group, a methoxy group, an isocyanate group, a vinyl group, and a silanol group, and more preferably a carboxyl group.
- the NBR having the carboxyl group include PNR-1H (manufactured by JSR Corporation), Nipol 1072J and Nipol DN631 (manufactured by Nippon Zeon Co., Ltd.).
- the content of the polymer resin may be 6 to 30 parts by weight, preferably 7 to 20 parts by weight, more preferably 7.5 to 16 parts by weight, based on 100 parts by weight of the total amount of the electromagnetic wave absorbing layer.
- the mixing ratio of the thermosetting resin to the thermoplastic resin may be 20 to 80: 80 to 20 by weight, preferably 50 To 60: 40 to 50 weight ratio.
- the electromagnetic wave absorptive layer 10 according to the present invention may further include at least one of a silane coupling agent and a dispersant.
- the silane coupling agent may be any of those conventionally known in the art, and is preferably a silane coupling agent having an epoxy group.
- epoxy silane coupling agents that can be used include 3- (glycidyloxy) propyl) trimethoxysilane, 3- (glycidyloxy) propyltriethoxysilane, 2- (3,4-epoxy Cyclohexyl) ethyltrimethoxysilane, 2- (3,4-epoxycyclohexyl) ethyltriethoxysilane, epoxypropoxypropyltrimethoxysilane, and the like can be used.
- the above-mentioned components may be used singly or in combination of two or more.
- the content of the silane coupling agent is not particularly limited and may be, for example, more than 0 and 5 parts by weight, preferably 0.3 to 1.5 parts by weight based on 100 parts by weight of the total amount of the electromagnetic wave absorbing layer.
- the dispersing agent serves to disperse the respective materials constituting the composition for forming an electromagnetic wave absorbing layer containing the soft magnetic powder and the polymer resin and prevent the re-agglomeration through maintaining the distance, thereby exhibiting the uniform physical properties of the electromagnetic wave absorbing layer.
- the dispersing agent those conventionally known in the art may be used.
- a dispersant of a block copolymer type having a high molecular weight may be used.
- a wetting dispersant is used.
- Such a wettable dispersant can further improve the dispersibility of the soft magnetic powder mixed therewith.
- the wetting and dispersing agent that can be used is not particularly limited as long as it is a conventional dispersion stabilizer used in the field of paints.
- Disperbyk-110, 111, 161 and 180 of BYK Co., Ltd. can be mentioned.
- the above-mentioned wettable dispersing agents may be used alone, or two or more kinds may be used in appropriate combination.
- the content of the dispersant is not particularly limited and may be, for example, more than 0 and 5 parts by weight, preferably 0.1 to 2 parts by weight based on 100 parts by weight of the total amount of the electromagnetic wave absorbing layer.
- the electromagnetic wave absorbing layer 10 comprises, based on 100 parts by weight of the electromagnetic wave absorbing layer, 70 to 93 parts by weight of the soft magnetic powder; 6 to 30 parts by weight of a polymer resin; More than 0, and not more than 5 parts by weight of silane coupling agent; And a dispersant in an amount of more than 0 and 5 parts by weight or less.
- the present invention can be applied to a flame retardant generally known in the art, other thermosetting resins, thermoplastic resins and oligomers thereof not described above, if necessary, as long as the intrinsic properties of the electromagnetic wave absorbing layer 10 are not impaired
- a flame retardant generally known in the art, other thermosetting resins, thermoplastic resins and oligomers thereof not described above, if necessary, as long as the intrinsic properties of the electromagnetic wave absorbing layer 10 are not impaired
- the thickness of the electromagnetic wave absorbing layer 10 is not particularly limited, and may be in the range of 20 to 100 mu m, preferably 25 to 80 mu m, and more preferably 25 to 50 mu m.
- the cover layer 20 serves to protect the electromagnetic wave absorbing layer while preventing contact with one surface of the electromagnetic wave absorbing layer 10 and to prevent the occurrence of cracks.
- a circuit board e.g., FCCL, FPCB
- FCCL Fibre Channel
- FPCB Fibre Channel Control Block
- the coverlay layer 20 may have a conventional structure known in the art.
- the coverlay layer 20 may be a multi-layer structure in which a polymer film layer 21, an adhesive layer 22 and a release layer 23 are sequentially laminated .
- the polymer film layer 21 serves as a base film of the coverlay layer 20 and serves as a support for coating the electromagnetic wave absorbing layer 10.
- the polymer film layer 21 may be a conventional polymer used in the coverlay field, and examples thereof include polyimide, polyester, polyphenylene sulfide, polyester sulfone, polyether ether ketone, aromatic polyamide, poly And at least one selected from the group consisting of carbonates and polyarylates. It is preferably a polyimide (PI) film.
- PI polyimide
- the thickness of the polymer film layer 21 is not particularly limited, and may range, for example, from 5 to 25 mu m, preferably from 7.5 to 12.5 mu m.
- the adhesive layer 22 may be formed to have a predetermined thickness on the other side of the polymer film layer 21, for example, a polyimide (PI) layer.
- PI polyimide
- the adhesive layer 22 a conventional adhesive known in the art may be used.
- the adhesive layer 22 may contain an acrylic adhesive, a silicone adhesive, an epoxy adhesive, or a mixture thereof.
- the thickness of the adhesive layer 22 is not particularly limited, and may be in the range of 5 to 25 ⁇ ⁇ , for example, and preferably in the range of 10 to 15 ⁇ ⁇ .
- the release layer 23 may be attached to the surface of the above-described adhesive layer 22, that is, the non-contact surface which does not contact the polymer film layer 21, in order to protect the adhesive layer.
- the release layer 23 may be any conventional one known in the art, and may be, for example, any one of a release paper and a release polymer film (for example, a release PET film). This release layer 23 can be formed by laminating.
- the above-mentioned release type polymer film can be applied without limitation to a constitution such as a conventional plastic film known in the art.
- plastic films that can be used include polyester films such as polyethylene terephthalate (PET), polybutylene terephthalate and polyethylene naphthalate, polyethylene films, polypropylene films, cellophane, diacetylcellulose films, triacetylcellulose films , Acetylcellulose butyrate film, polyvinyl chloride film, polyvinylidene chloride film, polyvinyl alcohol film, ethylene-vinyl acetate copolymer film, polystyrene film, polycarbonate film, polymethylpentene film, polysulfone film, A polyimide film, a fluoride resin film, a polyamide film, an acrylic resin film, a norbornene resin film, a cycloolefin resin film, and the like.
- These plastic films may be either transparent or semitransparent, and may be colored or non
- the non-coverage type base material layer is the non-coverage type base material layer
- the electromagnetic wave absorbing layer 10 of the present invention exhibits a high permeability, a high adhesive force, and excellent cracking characteristics as compared with the electromagnetic wave absorbing layer introduced into the conventional digitizer, and at the same time, It has a thin thickness of about 50%. As a result, the handleability in the manufacturing process of the electromagnetic wave absorbing film is lowered. Therefore, by using the non-coverlay type substrate layer, the thin electromagnetic wave absorbing layer 10 can be protected and the processability and processability can be improved.
- the non-coverage type base layer 30 is not particularly limited and may be at least one of a polyimide film, a polyethylene terephthalate film, a polyethylene naphthalate film, a protective film, It can be one.
- the protective film and the carrier film may be conventional ones known in the art.
- a polyimide film, a PET film, and a PEN film may have a pressure-sensitive adhesive layer on one side thereof.
- the pressure-sensitive adhesive layers 31a and 31b may be double-sided pressure-sensitive adhesive tape or double-sided pressure-sensitive adhesive tape commonly used in the art.
- epoxy-based pressure-sensitive adhesive, silicone pressure-sensitive adhesive, acrylic pressure-sensitive adhesive and mixtures thereof may be contained.
- it may be a liquid resin type PSA using a siloxane polymer as a binder.
- the non-coverlay base material layer 30 such as the protective film or the carrier film is laminated on one surface of the electromagnetic wave absorbing layer 10 and is located at the outer periphery of the electromagnetic wave absorbing adhesive film 100.
- the non-coverlay base material layer 30 may include a soft magnetic powder if necessary
- the thickness of the non-coverlay base material layer 30 is not particularly limited, and may be in the range of 20 to 100 mu m, for example.
- the total thickness of the electromagnetic wave-absorbing adhesive film 100 of the present invention configured as described above may be 50 to 500 ⁇ , and may have various thicknesses depending on the application.
- the thickness ratio (electromagnetic wave absorbing layer: cover layer: non-cover layer) of the cover layer 20 and the non-cover layer 30 to the electromagnetic wave absorbing layer 10 is 1: 0.2 to 2: 1 to 10 And preferably from 1: 0.5 to 1: 2 to 5.
- the electromagnetic wave absorbing adhesive film 100 can exhibit high permeability, excellent adhesive strength, high heat resistance, crack resistance, and mechanical properties through control of mixing of the electromagnetic wave absorbing layer 10 and optimization of the binder component used.
- Such a high permeability can improve the recognition function of the digitizer, can be made slimmer due to the reduction in thickness, and can significantly improve adhesion characteristics with other substrates.
- the peel strength value of the electromagnetic wave absorbing layer 10 with respect to the coverlay layer 20 in the electromagnetic wave absorbing adhesive film may be 0.5 kgf / cm or more. More specifically, the high-frequency branching film layer 21 and the electromagnetic wave absorbing layer 10 of the coverlay layer 20 are in close contact with each other, and the peeling strength (Peel) of the electromagnetic wave absorbing layer 10 to the polymer film layer 21 Strength value may be 0.6 to 2.0 kgf / cm, preferably 0.8 to 1.0 kgf / cm.
- the electromagnetic wave-absorbing adhesive film has a magnetic permeability ( ⁇ ') in a frequency band of 3 MHz and 100 kHz or more and 200 kHz or less of 70 or more and an investment loss rate ( ⁇ ' ≪ / RTI >
- the magnetic permeability ( ⁇ ') is in the range of 100 to 250, more preferably 150 to 250.
- the investment loss ( ⁇ '') can range from 25 to 35.
- the electromagnetic wave absorbing / bonding film may have a measurement time of 60 seconds or more until a blister is formed on the surface of the electromagnetic wave absorbing film in a 288 ° C water bath, May be 180 to 300 seconds.
- the electromagnetic wave-absorbing adhesive film according to the present invention may have three embodiments as follows. However, the present invention is not limited thereto.
- FIG. 1 schematically shows a cross-sectional structure of an electromagnetic wave absorbing adhesive film 100 according to an embodiment of the present invention.
- the electromagnetic wave absorbing adhesive film 100 includes a first base layer 30, (20) are arranged on both sides, and they are integrally formed.
- the first base layer 30 may be in the form of a single layer of a non-covered type base material.
- FIG. 2 is a schematic cross-sectional view of an electromagnetic wave absorbing adhesive film 110 according to another embodiment of the present invention.
- the cover layer 20 is laminated on one surface of an electromagnetic wave absorbing layer 10, Layer protective film and a carrier film are laminated on the other surface of the substrate 10, and these are laminated in an integral shape.
- the first base layer is one in which one of a protective film and a carrier film is introduced.
- the protective film and the carrier film are each coated with a first adhesive layer 31b on one side of the first polymer base material 31a.
- FIG. 3 is a schematic cross-sectional view of a structure of an electromagnetic wave absorbing adhesive film 120 according to another embodiment of the present invention.
- the cover layer 21 is laminated on one surface of an electromagnetic wave absorbing layer 10,
- a protective film 31 and a carrier film 32 are sequentially laminated on the other surface of the substrate 10, and these are laminated in a monolithic shape.
- the first base layer is a form in which both the protective film and the carrier film are introduced.
- the protective film 31 is formed by applying a first adhesive layer 31b to one surface of the first polymer base material 31a and the carrier film 32 is formed on the other surface of the second polymer base material 32a, And the adhesive layer 32b is applied.
- the carrier film 32 among the above-mentioned protective film 31 and the carrier film 32 be disposed at the outermost position, but it is also within the scope of the present invention that the carrier film 32 is applied to the outermost position.
- the electromagnetic wave absorptive layer 10 and the coverlay layer 20 have the same configuration, and a separate description thereof will be omitted.
- the present invention also provides a method for producing the above-mentioned electromagnetic wave absorbing film.
- a preferred embodiment for producing the electromagnetic wave absorbing film includes: preparing a cover layer; Coating and drying a thermosetting composition for forming an electromagnetic wave absorption layer on the coverlay layer to form an electromagnetic wave absorption layer; After the electromagnetic wave absorbing layer and the non-coverlay type base material (for example, the other of the first base layer and the second base layer) are arranged so as to face each other, continuous roll lamination is applied, And a step of integrating the data.
- the coverlay layer 20 may be formed by using a coverlay film used generally or by applying the adhesive layer 22 on one side of the polymer film layer 21 and then drying the release layer 23, As shown in FIG.
- thermosetting composition for forming an electromagnetic wave absorbing layer containing the soft magnetic powder 11 and the polymer resin 12 is coated on the other surface of the coverlay layer 20, specifically, the polymer film layer 21.
- the thermosetting composition for forming an electromagnetic wave absorbing layer comprises 70 to 93 parts by weight of a soft magnetic powder relative to 100 parts by weight of the composition; 6 to 30 parts by weight of a polymer resin; And at least one of a silane coupling agent and a dispersant, and the content thereof may be more than 0 and not more than 5 parts by weight based on 100 parts by weight of the composition.
- the method of applying the thermosetting composition on the polymer film layer is not particularly limited, and conventional coating methods known in the art can be used without limitation.
- various methods such as a casting method, a dip coating method, a die coating method, a roll coating method, a slot die method, a comma coating method, or a combination thereof may be used.
- the drying process may be suitably carried out under ordinary conditions known in the art. For example, the drying can be carried out at 100 to 200 ° C.
- the electromagnetic wave absorbing layer and the non-coverlay type substrate are arranged so as to face each other, and then a thermocompression lamination process is performed.
- the conditions of the pressing process can be suitably adjusted within the conventional range known in the art.
- thermocompression Lami The process (roll to roll) conditions can be performed at a temperature of 50 to 250 ° C, a pressure of 3 to 200 kgf / cm 2, and a compression rate of 0.1 m / min to 20 m / min.
- coverlay layer may each be in the form of a sheet, and they may be laminated continuously in accordance with the above-described roll-to-roll method and then wound in a roll form.
- coverlay layer may each be laminated continuously in accordance with the above-described roll-to-roll method and then wound in a roll form.
- sheet-to-sheet laminate a roll-to-sheet laminate, or the like may be used.
- a coverlay layer 20 composed of the polymer film layer 21, the adhesive layer 22 and the release layer 23 as described above; An electromagnetic wave absorbing layer (10);
- the coverlay integrated electromagnetic wave absorbing films 100, 110, and 120 can be formed by integrating the non-coverlay base material layers 30 with each other. Accordingly, in the present invention, not only a slimming effect and a heat-resistant durability effect are imparted to the portable terminal equipped with the electromagnetic wave absorbing film in which the electromagnetic wave absorbing layer 10 and the cover layer 20 are integrated, Roll-to-roll continuous method.
- the present invention also provides an electromagnetic wave absorptive composite substrate in which the above-mentioned electromagnetic wave absorbing film is laminated on one surface.
- FIG. 4 schematically shows a cross-sectional structure of an electromagnetic wave-absorbing composite substrate 200 according to an embodiment of the present invention.
- the electromagnetic wave absorptive composite substrate 200 of the present invention includes an adhesive layer 22 (not shown) after the release layer 23 disposed on the outermost periphery of the cover layer 20 of the electromagnetic wave absorbing film is detached, And the nonmagnetic substrate 40 are stacked so as to face each other. More specifically, the electromagnetic wave absorbing composite substrate 200 includes a non-magnetic substrate 40 having a copper foil layer; And an electromagnetic wave absorbing film disposed on one surface of the non-magnetic substrate 40, wherein the adhesive layer 220 of the cover layer 20 located on one surface of the electromagnetic wave absorbing film and the non- 40 may be stacked in a state in which they are in close contact with each other.
- the non-magnetic substrate 40 may be made of a copper foil layer, or a conventional substrate, a copper foil with a resin, a copper foil layer or a sheet in the form of a layer in which an insulating adhesive layer and a copper foil layer are laminated.
- the non-magnetic substrate may be a flexible printed circuit board (FCCL) or a flexible printed circuit board (FPCB).
- the non-magnetic substrate 40 includes an insulating adhesive layer and a copper foil layer.
- the thickness of the copper foil layer is not particularly limited, and may range, for example, from 6 to 105 mu m, preferably from 9 to 18 mu m.
- the copper foil layer may form a circuit pattern portion by a conventional dry or wet etching known in the art. Specifically, it is preferable that a circuit pattern of a predetermined shape is formed on at least one surface of the nonmagnetic substrate 40, and particularly, a copper circuit pattern layer and a photo solder resist (PSR) layer for insulating the circuit layer are formed Do.
- PSR photo solder resist
- FIG. 5 schematically shows a cross section of an electromagnetic wave absorbing composite substrate 300 in which a non-cover layer 30 disposed on the top of the electromagnetic wave absorbing composite substrate 200 shown in FIG. 4 is detached Fig.
- the electromagnetic wave absorbing composite substrate 300 includes a non-magnetic substrate 40 having a copper foil layer; And an electromagnetic wave absorbing film disposed on one surface of the non-magnetic substrate, wherein the non-magnetic substrate (40); An adhesive layer 22; A polymer film (21); And the electromagnetic wave absorptive layer 10 are sequentially laminated.
- thermosetting composition for forming an electromagnetic wave absorbing layer 1-1.
- thermosetting composition for forming an electromagnetic wave absorbing layer The components of the thermosetting composition for forming an electromagnetic wave absorbing layer were prepared by mixing according to the proportions of the compounding examples shown in the following Table 1.
- Table 1 the unit of usage of each composition is parts by weight.
- An electromagnetic wave absorbing layer (PMS layer) was formed on one surface of the polyimide layer (12 ⁇ ⁇ ) to have a thickness of 60 ⁇ ⁇ after drying by coating the thermosetting composition for forming an electromagnetic wave absorbing layer 1-1 described above, Were successively coated / dried and a release paper was disposed to prepare a coverlay layer having a thickness of 24 mu m.
- Pressure-sensitive adhesive layer on one side (PSA, 10 ⁇ m) is formed, the polyimide layer (25 ⁇ 50 ⁇ m) after placing a protective film constituted by a surface of the electromagnetic wave absorbing layer 200 °C, linear pressure 50 kgf / cm 2 at the heat-pressing roll laminator at And then post-curing at 160 ° C for 2 hours to prepare an electromagnetic wave absorbing film of Example 1.
- FCCL thickness: 36 ⁇ m
- Magnetic powder 1 Sendust alloy [Fe-Al-Si alloy]
- Thermosetting resin 2 Bisphenol A epoxy resin, Kukdo Chemical YD-011
- Thermoplastic resin 3 Carboxyl-terminated acrylonitrile butadiene rubber [CTBN (Carboxyl-Terminated Butadiene Acrylonitrile Rubber), Zippon Nippol 1072
- Silane coupling agent Epoxy silane, Shin-Etsu, KBM 603
- Dispersant BYK, Disperbyk-110
- the electromagnetic wave absorbing films of Comparative Examples 1 and 2 were produced in the same manner as in Example 1, except that the composition was changed as shown in Table 1.
- a test piece was prepared by cutting the electromagnetic wave absorbing film to 25 mm sides, and the test piece was suspended in a solder bath of 288 ⁇ ⁇ . Then, the time until blisters were formed on the surface of the electromagnetic wave absorbing film was measured.
- the permeability was measured in the 3 MHz frequency band using the Impedance / Material Analyzer (E4991A).
- the electromagnetic wave absorbing film was repeatedly folded 180 degrees five times, and then the occurrence of cracks was confirmed.
- X was evaluated as " C " when cracks were not generated, and " Cracks did not occur "
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Abstract
Description
실시예 | 비교예 | ||||||||
1 | 2 | 3 | 4 | 5 | 6 | 1 | 2 | ||
배합비 | 자성 분말1) | 70 | 75 | 80 | 85 | 85 | 85 | 90 | 95 |
열경화성 수지2) | 7 | 6 | 5 | 4 | 4 | 4 | 3 | 2 | |
열가소성 수지3) | 6 | 5 | 4 | 3 | 3 | 3 | 2 | 1 | |
분산제 | 0.8 | 0.8 | 0.8 | 0.8 | 0.4 | 1.2 | 0.8 | 0.8 | |
실란 커플링제 | 0.5 | 0.5 | 0.5 | 0.5 | 0.2 | 0.8 | 0.5 | 0.5 | |
특성 | 투자율 | 70 | 100 | 120 | 180 | 180 | 180 | 210 | 230 |
접착력(@ PI) | 1.0 | 1.0 | 0.8 | 0.7 | 0.6 | 0.5 | 0.4 | 0.2 | |
내열성 | Pass | Pass | Pass | Pass | Pass | Pass | Pass | Pass | |
Crack | ○ | ○ | ○ | ○ | ○ | ○ | △ | × |
Claims (21)
- 전자파 흡수층; 및상기 전자파 흡수층의 일면과 타면에 각각 배치된 제1기재층과 제2기재층을 포함하고, 상기 제1기재층, 제2기재층 및 이들 사이에 개재된 전자파 흡수층이 일체로 형성된 전자파 흡수 필름으로서,상기 제1기재층과 제2기재층 중 어느 하나는 고분자 필름층; 접착제층; 및 이형층이 적층된 커버레이층이고,상기 고분자 필름층에 대한 전자파 흡수층의 박리강도(Peel Strength) 값이 0.5 kgf/cm 이상인 것을 특징으로 하는 전자파 흡수 필름.
- 제1항에 있어서,상기 고분자 필름층은 상기 전자파 흡수층과 밀착되어 있으며,상기 고분자 필름층에 대한 전자파 흡수층의 박리강도 값이 0.6 내지 2.0 kgf/cm 인 것을 특징으로 하는 전자파 흡수 필름.
- 제1항에 있어서,상기 고분자 필름층은 폴리이미드, 폴리에스테르, 폴리페닐렌 술파이드, 폴리에스테르술폰, 폴리에테르에테르 케톤, 방향족 폴리아마이드, 폴리카보네이트 및 폴리아릴레이트로 이루어진 군에서 선택된 1종 이상을 포함하는 것을 특징으로 하는 전자파 흡수 필름.
- 제1항에 있어서,상기 전자파 흡수층은 연자성 분말 및 고분자 수지를 포함하는 조성물의 경화물인 것을 특징으로 하는 전자파 흡수 필름.
- 제4항에 있어서,상기 연자성 분말은 페라이트(ferrite), 철, 카보닐철, 퍼멀로이(permalloy, Fe-Ni), 몰리퍼멀로이(Fe-Ni-Mo), 센더스트(sendust, Fe-Al-Si 합금), 규소계 철분말(Fe-Si-Cr), 규소강(Fe-Si), 합금 알펌(alperm, Fe-Al), 퍼맨더(permendur, Fe-Co) 및 스테인리스강(Fe-Cr, Fe-Cr-Ni)으로 구성된 군에서 선택되는 1종 이상인 것을 특징으로 하는 전자파 흡수 필름.
- 제4항에 있어서,상기 고분자 수지는 열경화성 수지, 또는 상기 열경화성 수지와 열가소성 수지를 포함하는 것을 특징으로 하는 전자파 흡수 필름.
- 제7항에 있어서,상기 열경화성 수지는 에폭시 수지, 페놀수지, 멜라민 수지, 실리콘 수지, 우레탄 수지 및 요소 수지로 구성된 군에서 선택된 1종 이상인 것을 특징으로 하는 전자파 흡수 필름.
- 제7항에 있어서,상기 열가소성 수지는 폴리에틸렌, 폴리프로필렌, 폴리스티렌, 폴리이미드, 테프론(PTFE), 아크릴로니트릴-부타디엔 러버(NBR), 스티렌 부타디엔 러버(SBR), 아크릴로니트릴-부타디엔-스티렌 러버(ABS), 카르복실-말단화된 부타디엔 아크릴로니트릴 러버(CTBN), 폴리부타디엔(polybutadiene), 및 스티렌(styrene)-부타디엔(butadiene)-에틸렌 수지(SEBS)로 구성된 군에서 선택된 1종 이상인 것을 특징으로 하는 전자파 흡수 필름.
- 제7항에 있어서,상기 열경화성 수지와 열가소성 수지의 혼합 비율은, 당해 고분자 수지 100 중량부를 기준으로 하여 20~80 : 80~20 중량비인 것을 특징으로 하는 전자파 흡수 필름.
- 제4항에 있어서,상기 전자파 흡수층은 실란 커플링제 및 분산제 중 적어도 하나를 더 포함하는 것을 특징으로 하는 전자파 흡수 필름.
- 제1항에 있어서,상기 전자파 흡수층의 두께는 20 내지 100 ㎛인 것을 특징으로 하는 전자파 흡수 필름.
- 제1항에 있어서,상기 이형층은 이형지(release paper), 및 이형 고분자 필름 중 어느 하나인 것을 특징으로 하는 전자파 흡수 필름.
- 제1항에 있어서,상기 제1기재층과 제2기재층 중 다른 하나는 폴리이미드(PI) 필름, PET (polyethylene terephthalate) 필름, PEN (polyethylene naphthalate) 필름, 보호 필름, 및 캐리어 필름 중 적어도 하나인 것을 특징으로 하는 전자파 흡수 필름.
- 제13항에 있어서,상기 보호필름과 캐리어 필름은 각각 폴리이미드 필름, PET 필름, PEN 필름의 일면에 점착층이 형성된 것을 특징으로 하는 전자파 흡수 필름.
- 전자파 흡수층; 및상기 전자파 흡수층의 일면과 타면에 각각 배치된 제1기재층과 제2기재층을 포함하고, 상기 제1기재층, 제2기재층 및 이들 사이에 개재된 전자파 흡수층이 일체로 형성된 전자파 흡수 필름으로서,상기 제1기재층과 제2기재층 중 어느 하나는 고분자 필름층; 접착제층; 및 이형층이 순차적으로 적층된 커버레이층이고,3 MHz 및 100kHz 이상 200kHz 이하의 주파수에서의 투자율이 70 이상인 것을 특징으로 하는 전자파 흡수 필름.
- 제15항에 있어서,3 MHz 및 100kHz 이상 200kHz 이하의 주파수에서의 투자율이 100 내지 250인 것을 특징으로 하는 전자파 흡수 필름.
- 전자파 흡수층; 및상기 전자파 흡수층의 일면과 타면에 각각 배치된 제1기재층과 제2기재층을 포함하고, 상기 제1기재층, 제2기재층 및 이들 사이에 개재된 전자파 흡수층이 일체로 형성된 전자파 흡수 필름으로서,상기 제1기재층과 제2기재층 중 어느 하나는 고분자 필름층; 접착제층; 및 이형층이 순차적으로 적층된 커버레이층이고,288℃의 납조에서 상기 전자파 흡수 필름의 표면에 블리스터가 발생될 때까지의 측정시간이 10초 이상인 것을 특징으로 하는 전자파 흡수 필름.
- 동박층을 갖는 비(非)자성 기판; 및상기 비자성 기판의 일면 상에 배치된 제1항 내지 제17항 중 어느 한 항에 기재된 전자파 흡수 필름을 포함하며, 상기 전자파 흡수 필름의 일면에 위치하는 커버레이층의 접착제층과 상기 비자성 기판의 동박층이 서로 밀착된 상태로 적층되는 것을 특징으로 하는 전자파 흡수형 복합기판.
- 제18항에 있어서,상기 전자파 흡수형 복합기판은상기 비자성 기판의 동박층과 상기 자기장 흡수 필름의 접착제층이 밀착된 상태로 적층하여 압착된 후, 상기 전자파 흡수 필름의 타면에 위치하는 제1기재층과 제2기재층 중 다른 하나를 탈착하는 것을 특징으로 하는 전자파 흡수형 복합기판.
- 제19항에 있어서,상기 전자파 흡수형 복합기판은비(非)자성 기판; 접착제층; 고분자 필름; 및 전자파 흡수층이 순차적으로 적층되는 것을 특징으로 하는 전자파 흡수형 복합기판.
- 제18항에 있어서,상기 비자성 기판은 연성 동박 적층판(FCCL) 또는 연성 인쇄회로기판(FPCB)인 것을 특징으로 하는 전자파 흡수형 복합기판.
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CN111935605B (zh) * | 2020-09-23 | 2021-01-22 | 歌尔股份有限公司 | 一种发声装置的复合振膜及其制备方法、发声装置 |
KR102591987B1 (ko) * | 2021-11-18 | 2023-10-23 | 광성기업 주식회사 | 전자파 차폐용 플라스틱 복합재 |
KR102591991B1 (ko) * | 2021-11-18 | 2023-10-23 | 광성기업 주식회사 | 난연성 코팅층이 형성된 전자파 차폐용 플라스틱 복합재 |
KR102515146B1 (ko) * | 2021-11-26 | 2023-03-29 | 조의제 | Fpcb기판 핫프레스 공정용 이형필름 |
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KR102521946B1 (ko) * | 2022-02-24 | 2023-04-17 | 한국항공우주산업 주식회사 | 전자파흡수필름 제조방법 및 전자파흡수필름을 포함하는 항공기용 전자파흡수패널 |
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KR102251415B1 (ko) * | 2014-12-24 | 2021-05-12 | 주식회사 두산 | 연성 인쇄회로기판용 전자파 차폐 필름의 제조방법 |
KR101772871B1 (ko) * | 2016-07-11 | 2017-08-30 | 주식회사 두산 | 안테나 모듈 형성용 복합기판 및 이의 제조방법 |
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KR101326642B1 (ko) * | 2012-10-19 | 2013-11-07 | 주식회사 이녹스 | 커버레이 일체형 구조의 전자파 흡수체 및 그 제조 방법 |
KR101321511B1 (ko) * | 2013-05-21 | 2013-10-28 | (주)켐스 | 커버레이 일체형 전자파 흡수시트의 제조방법 및 그에 의한 커버레이 일체형 전자파 흡수시트 |
KR101549988B1 (ko) * | 2014-05-30 | 2015-09-03 | (주)창성 | 커버레이 분리형 자성시트와 이를 포함하는 연성인쇄회로기판 및 이들의 제조방법 |
KR101617403B1 (ko) * | 2014-12-18 | 2016-05-02 | 율촌화학 주식회사 | 전자파 흡수 시트용 조성물 및 이를 포함하는 시트 |
KR101616787B1 (ko) * | 2015-07-03 | 2016-04-29 | 이재희 | 자기장 차폐 시트 및 그의 제조방법 |
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CN111295935B (zh) | 2022-04-05 |
CN111295935A (zh) | 2020-06-16 |
KR20190075709A (ko) | 2019-07-01 |
KR102451935B1 (ko) | 2022-10-07 |
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