JP4956867B2 - Flat cable shield material and shielded flat cable - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a flat cable shield material (electromagnetic wave shielding film) and a flat cable with a shield function using the same, and in particular, by improving the layer structure such as a shield layer and an adhesive layer of the shield material, the shield layer and the ground Shielding material for flat cable that has excellent shielding performance, slidability, flame retardancy, economy, and excellent workability for mounting to flat cable, as well as making it easy to conduct with wires It relates to a flat cable with a shield function used.
[0002]
[Prior art]
In recent years, flat cables have been used in place of laterally wound shielded wires and coaxial wires for signal transmission of interfaces within and between devices such as communication devices, computers and peripheral devices.
However, in today's environment where various radio waves, electromagnetic waves, etc. are generated, flat cables are often affected by these effects, causing computer malfunctions.
[0003]
Therefore, various shielding techniques have been developed to protect the flat cable from electromagnetic waves and to shield the electromagnetic waves generated from the flat cable from affecting other devices.
For example, a metal foil is used for a shield layer of a shield material, and an insulating adhesive layer is provided on the surface of the metal foil in order to bond the metal foil to a flat cable.
In addition, a shielding material in which an adhesive obtained by adding a conductive material such as metal powder to a plastic film is applied and the conductive adhesive layer is used as a shield layer has been studied. Further, a shielding material having a conductive adhesive layer obtained by adding a conductive material such as metal powder to a metal foil to form a shield layer has been studied.
[0004]
In order to improve the slidability of the shield material, an electromagnetic wave shielding film in which an adhesive resin layer containing silver particles and / or copper particles is formed after a metal thin film is formed on the base film has been proposed. (JP-A-7-94036).
Since this shield tape has a metal thin film, it has excellent conductivity and electromagnetic shielding properties are improved, but when silver particles are contained in the adhesive resin layer, the cost is increased, and when copper particles are contained, Deterioration of shield characteristics over time becomes a problem.
[0005]
In addition, an electromagnetic wave shielding film in which a silver deposited film is formed as a metal thin film on a base film and a nickel filler is contained in an adhesive resin layer has been proposed (Japanese Patent Laid-Open No. 11-120831).
This shield tape is also expensive because the base film is a flame-retardant engineering plastic and the metal thin film is silver-deposited.
Further, in order to impart flame retardancy to the base film, those using a flame retardant engineering plastic film such as polyphenylene sulfide, polyamide imide, polyether imide, and polyarylate are known as the base film.
[0006]
[Problems to be solved by the invention]
However, a metal foil is used for the shield layer of the shield material, and an insulating adhesive layer is provided on the surface of the metal foil in order to bond the metal foil to the flat cable. In order to conduct the wire, a part of the insulating adhesive layer is cut to expose the metal foil, and a part of the flat cable covering material is cut to expose the ground wire, and the exposed ground wire And metal foil (shield layer) must be made conductive by a special processing method such as spot welding.
Further, when a metal foil is used for the shield layer, there is a problem that the metal foil is inferior in flexibility, so that there are restrictions on the mounting of the flat cable and the shape of the electronic member is restricted.
[0007]
In order to solve the above problems, a shield material provided with a conductive adhesive layer on a plastic film has improved flexibility, so that there is a restriction on the mounting of a flat cable or a restriction on the shape of an electronic member. However, there is a problem that the shielding properties are inferior to the shielding material using metal foil.
In addition, in order to give flame resistance to the shielding material, when using flame retardant engineering plastic films such as polyphenylene sulfide, polyamide imide, polyether imide, polyarylate, etc. as the base film, the cost of these films is high. However, the cost of the shielding material is high, and there is a problem in terms of economy.
[0008]
The present invention has been made to solve such problems, and the object of the present invention is to improve workability when attaching to a flat cable to provide electromagnetic wave shielding, and to provide necessary sliding properties. Provides flat cable shield materials with dynamic characteristics, electromagnetic wave shielding properties, conductive thermal adhesiveness, flame retardancy, and excellent economy, and together with the necessary performance manufactured using the shielding materials The object is to provide a flat cable with a shield function that is also economical.
[0009]
[Means for Solving the Problems]
The above problems can be solved by the following present invention.
That is, the invention described in claim 1 is a conductive material comprising at least a metal thin film layer and a synthetic resin containing carbon particles and a flame retardant agent on one surface of a flexible insulating substrate. It consists of a flat cable shield material characterized in that a flame retardant layer and a conductive thermal adhesive layer containing carbon particles in a thermal adhesive resin are sequentially laminated.
[0010]
By adopting such a configuration, the following effects can be obtained.
(1) Since the metal thin film layer is used instead of the metal foil as the electromagnetic wave shielding layer (shield layer), the shield material can have good shielding properties and excellent flexibility. Therefore, the flat cable to which this is attached can be made excellent in shielding properties and sliding properties without any restrictions on the mounting and no restrictions on the shape of the electronic member.
(2) Since the conductive flame retardant layer and the conductive thermal adhesive layer are divided into two layers on the metal thin film layer as the electromagnetic wave shielding layer, in the conductive flame retardant layer, heat There is no need to consider adhesiveness, more flame retardant imparting agents and carbon particles can be contained, and the level of flame retardancy and conductivity can be further improved. In addition, the conductive thermal adhesive layer does not contain a flame retardant imparting agent and can be formed by containing only carbon particles in the thermal adhesive resin, so that the level of thermal adhesiveness and electrical conductivity can be further improved. it can.
(3) Since a conductive flame retardant layer is provided in a substantially intermediate layer of the shield material for flat cables, a conventional high cost flame retardant engineering plastic film on a flexible insulating substrate For example, even if a general-purpose plastic film such as a biaxially stretched polyethylene terephthalate film is used, flame resistance can be imparted to the shield material, so that the cost can be reduced.
(4) In addition, the conductive flame retardant layer and the conductive thermal adhesive layer laminated on the metal thin film layer as the electromagnetic wave shielding layer both have conductivity and become the innermost conductive layer. Since the thermal adhesive layer has thermal adhesiveness, it can be easily attached to the flat cable by thermocompression bonding, and at this time, only a part of the ground wire of the flat cable is exposed. Conduction with the metal thin film layer (electromagnetic wave shielding layer) can be easily performed.
[0011]
According to a second aspect of the present invention, the flexible insulating substrate is a biaxially stretched polyethylene terephthalate film, and the metal thin film layer is an aluminum deposited layer having a thickness of 0.04 to 0.2 μm. It consists of the shielding material for flat cables of Claim 1 characterized by these.
[0012]
By adopting such a configuration, in addition to the effects of the invention described in claim 1, the biaxially stretched polyethylene terephthalate film (hereinafter referred to as PET film) is flexible and insulative. Since the overall performance such as heat resistance, mechanical strength, water resistance, and chemical resistance is excellent and the cost is low, the cost can be reduced while maintaining the necessary performance of the shielding material.
In addition, by using a metal thin film layer of the shield layer as an aluminum vapor deposition layer having a thickness of 0.04 to 0.2 μm, the shield has a flexible and sufficient shielding effect, and is excellent in productivity and economy. It can be a layer.
The thickness of the aluminum vapor deposition layer is preferably in the range of 0.04 to 0.2 μm, and more preferably in the range of 0.09 to 0.12 μm. When the thickness is less than 0.04 μm, the shielding effect is insufficient, and when the thickness exceeds 0.2 μm, the shielding performance is already sufficient, rather the productivity is lowered and the manufacturing cost is also reduced. Since it rises, it is not preferable.
[0013]
According to a third aspect of the present invention, the carbon particles contained in the conductive flame retardant layer and the conductive thermal adhesive layer are spherical or granular carbon particles having a particle diameter of 0.01 to 20 μm, 3. The flat cable shielding material according to claim 1, wherein the content of the carbon particles in the layer is 10 to 30% by weight.
[0014]
The carbon particles include spherical, granular, flaky, fibrous, and needle-like shapes. From the viewpoint of conductivity, flaky, fibrous, and needle-like shapes are preferred, but spherical and granular shapes. Can be preferably used because it is easy to disperse, good conductivity can be obtained by adjusting the content, and the cost is low.
The particle diameter of the spherical or granular carbon particles is preferably from 0.01 to 20 μm, and more preferably from 0.01 to 5 μm from the viewpoint of good dispersibility and film forming processability.
[0015]
Therefore, by adopting the configuration as described above, in addition to the function and effect of the invention described in claim 1 or 2, the conductive flame retardant layer and the conductive thermal adhesive layer can be more easily and at low cost. Can be formed.
In addition, by setting the content of the carbon particles in each layer to 10 to 30% by weight, necessary conductivity (for example, a surface specific resistance of 10Ω / □ or less) can be reliably imparted.
When the content of the carbon particles is less than 10% by weight, the conductivity becomes insufficient, which is not preferable. When the content exceeds 30% by weight, the conductivity is sufficient, but the processability of film formation decreases. In particular, in a conductive thermal adhesive layer, the thermal adhesiveness is lowered, which is not preferable.
[0016]
The invention described in claim 4 is characterized in that the flat cable shield material according to any one of claims 1 to 3 is integrated by heating and pressurizing the outer periphery of the flat cable, thereby providing a shield function to the flat cable. This is a shielded flat cable.
[0017]
By adopting such a configuration, the performance and effect of the flat cable shield material according to any one of claims 1 to 3 are added to the flat cable. A shielded flat cable excellent in performance and productivity such as flame retardancy can be provided economically.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic cross-sectional view showing a configuration of an embodiment of a shield material for a flat cable according to the present invention.
FIG. 2 is a view for explaining the configuration of one embodiment of a shielded flat cable manufactured using the flat cable shielding material of the present invention, wherein (a) is a partially cutaway plan view, (B) is an enlarged cross-sectional view taken along line AA in (a).
[0019]
The flat cable shielding material of the present invention can be configured as shown in FIG. That is, the flat cable shield material 10 shown in FIG. 1 is provided with a metal thin film layer 2 such as an aluminum deposited layer as a shield layer on one surface of a flexible insulating substrate 1 such as a PET film, On the metal thin film layer 2 is provided a conductive flame retardant layer 3 in which carbon particles and a flame retardant imparting agent are contained in a synthetic resin, and further, carbon particles are contained in the thermal adhesive resin thereon. The conductive heat bonding layer 4 thus formed is provided.
Although not shown in the drawing, a primer layer or the like may be provided in advance on the formation surface of the metal thin film layer 2 of the flexible insulating base material 1 to improve the adhesiveness as necessary. .
[0020]
Moreover, when manufacturing a flat cable with a shield using the said shielding material 10 for flat cables, it can comprise as shown to (A) and (B) of FIG. 2, for example.
That is, the shielded flat cable 100 shown in FIG. 2 has the conductor 5 and the ground wire 6 made of tin-plated annealed copper foil arranged in parallel at a predetermined interval and covered with the flat cable covering material 7 from both sides. 5 and the ground wire 6 are embedded by heating and pressurizing so that a flat cable is produced, and the covering material 7 on one side of the ground wire 6 of the flat cable is partially cut in the length direction, After the ground wire 6 is exposed, the outer periphery of the ground wire 6 is placed with the shield material 10 for the flat cable, the conductive thermal adhesive layer 4 is directed inward, and both ends are overlapped, and heated from both sides with a heating rubber roll. It is configured by pressurizing and thermally bonding and integrating.
[0021]
By adopting such a configuration, the exposed portion of the ground wire 6 and the metal thin film layer (shield layer) 2 of the flat cable shield member 10 are electrically connected to the conductive flame retardant layer 3 only by heating and pressurization. It is easily conducted at the ground wire-shield layer conducting portion 8 through the thermal adhesive layer 4, and excellent shielding properties are imparted to the flat cable, and it is excellent in performance and economy such as slidability and flame retardancy. The shielded flat cable 100 can be provided with high productivity.
In FIG. 2, as an example of a shielded flat cable, a configuration in which the flat cable shield material 10 is attached to the entire outer periphery of the flat cable is shown in order to further improve the shielding effect. Depending on the case, for example, a flat cable shield material may be attached only to the surface of the flat cable on which the ground wire is exposed.
[0022]
In the flat cable shield material 10 (see FIG. 1) of the present invention, the flexible insulating base 1 has flexibility, electrical insulation, heat resistance, various mechanical strengths, and chemical resistance. In addition to excellent performance such as solvent resistance, it is preferable that the cost is low, for example, polyesters such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polytetramethylene terephthalate, polypropylene, ethylene-propylene copolymer, etc. Polyolefin, nylon 12, nylon 6, nylon 66, polyamides such as wholly aromatic polyamides, non-stretched or stretched films such as fluorine-containing resins such as polytetrafluoroethylene, polytrifluoroethylene, polyvinylidene fluoride, and polyvinyl fluoride can do Among these, the PET film is excellent in the ease of film formation and economy as well as the above performance, and can be particularly preferably used.
The thickness of the flexible insulating substrate 1 is suitably in the range of 6 to 20 μm from the viewpoint of strength and flexibility. Moreover, it is preferable to perform adhesion reinforcement | strengthening processes, such as a corona discharge process, a plasma process, and an ozone process, to the formation surface of the metal thin film layer 2 of the insulating base material 1. FIG.
[0023]
Next, the metal thin film layer (shield layer) 2 provided on one surface of the flexible insulating substrate 1 is preferably highly conductive when a thin film is formed. For example, aluminum, silver, copper A vapor deposition layer of nickel or the like is suitable, and an aluminum vapor deposition layer is particularly preferable because it is excellent in vapor deposition processability and conductivity, is low in cost, and is excellent in economy.
[0024]
The thicker the metal thin film layer 2 is, the higher the shielding property is. However, when the metal thin film layer 2 is too thick, the flexibility is lowered and the bending suitability and the sliding property are deteriorated. Accordingly, the thickness of the metal thin film layer 2 is suitably 0.04 to 0.2 μm, and more preferably 0.08 to 0.15 μm.
As a method for forming the metal thin film layer 2, vacuum deposition, sputtering, CVD, or the like can be used, but a vacuum deposition method excellent in mass productivity is advantageous.
[0025]
The conductive flame retardant layer 3 provided on the metal thin film layer 2 is formed of a resin layer in which carbon particles and a flame retarder are added to a synthetic resin of a binder, and the carbon particles are added to the synthetic resin solution of the binder. It is possible to reduce the thermal history of the flame retardant imparting agent by dispersing or dissolving the flame retardant imparting agent and preparing a coating solution, and forming the coating solution on the metal thin film layer 2 by drying. Is preferable.
[0026]
The binder synthetic resin may be any resin as long as it has moderate flexibility and heat resistance, and adheres well to the metal thin film layer 2. For example, in addition to polyurethane resins and polyester resins, polystyrene resins Polyvinyl acetate resins, polyolefin resins (including ionomers and other acid-modified polyolefin resins), polyamide resins, polyacrylic or polymethacrylic resins, and the like can be used.
[0027]
As described above, the carbon particles have a spherical shape, a granular shape, a flake shape, a fiber shape, a needle shape, and the like, and in terms of conductivity, a shape such as a flake shape, a fiber shape, and a needle shape is preferable. Spherical and granular materials can be preferably used because they are easily dispersed and good conductivity can be obtained by adjusting the content, and the cost is low.
The particle diameter of such carbon particles is preferably 0.01 to 20 μm, and more preferably 0.01 to 5 μm, which is easy to disperse. The carbon particle content is preferably 10 to 30% by weight of the solid content of the conductive flame retardant layer 3.
[0028]
Examples of the flame retardant imparting agent include chlorinated paraffin, chlorinated polyethylene, chlorinated polyphenyl, perchlorpentacyclodecane, heptonic anhydride, chlorendic acid and other chlorinated compounds, and tetrabromoethane and tetrabromobisphenol. Organic or inorganic compounds containing halogen elements such as A, hexabromobenzene, decabromobiphenyl ether, tetrabromophthalic anhydride, polydibromophenylene oxide, hexabromocyclodecane, ammonium bromide, and the like, and triallyl phosphate , Alkyl allyl phosphate, alkyl phosphate, dimethyl phosphate, phosphorate, halogenated phosphorate ester, trimethyl phosphate, tributyl phosphate, trioctyl phosphate Phosphate, tributoxyethyl phosphate, octyl diphenyl phosphate, tricresyl phosphate, cresyl phenyl phosphate, triphenyl phosphate, tris (chloroethyl) phosphate, tris (2-chloropropyl) phosphate, tris (2,3-dichloropropyl) phosphate , Tris (2,3-dibromopropyl) phosphate, bis (2,3-dibromopropyl) 2,3-dichloropropyl phosphate, bis (chloropropyl) monooctyl phosphate, polyphosphate, polyphosphate, aromatic polyphosphate Polyphosphates such as phosphate esters or phosphorus compounds such as dibromoneobutyl glycol, phosphonate polyols, phosphate polyols and halogen-containing polyols Compounds, aluminum hydroxide, magnesium hydroxide, antimony trioxide, antimony trichloride, antimony pentoxide, zinc borate, antimony borate, boric acid, antimony molybdate, molybdenum oxide, phosphorus / nitrogen compounds, calcium / aluminum silicate , Zirconium compounds, tin compounds, dawsonite, calcium aluminate hydrate, copper oxide, metal copper powder, calcium carbonate, barium metaborate, and other metal powders and inorganic compounds, silicone polymers, ferrocene, fumaric acid, maleic acid , Triazine compounds, melamine cyanurate, isocyanurate, urea, guanidine compounds, and the like can be used.
[0029]
In the present invention, one or more flame retardant imparting agents as described above are added to one or more synthetic resins as described above, and other additives are added as necessary. In addition, for example, a coating solution is prepared by mixing, dispersing or dissolving with a solvent such as toluene, ethyl acetate, alcohols, methyl ethyl ketone, a diluent, etc., and this is used for knife coating, roll coating, bar coating, micro bar coating, The conductive flame retardant layer 3 can be formed by applying and drying by a coating means such as a gravure coat.
[0030]
The coating liquid for the conductive flame retardant layer 3 is not limited to an organic solvent type, and may be an emulsion or a dispersion based on a water system, a water-alcohol system, or the like depending on a synthetic resin to be selected.
Further, the content of the flame retardant imparting agent in the conductive flame retardant layer 3 is preferably 20 to 70% by weight, more preferably 30 to 60% by weight, based on the solid content of the conductive flame retardant layer.
The thickness of such a conductive flame retardant layer 3 can be appropriately set within a range of 10 to 60 μm.
[0031]
By providing such a conductive flame retardant layer 3 on the metal thin film layer 2 provided on the flexible insulating base material 1, even when a PET film is used as the insulating base material 1, oxygen With an index (JIS K7201-2), 21 or more flame retardancy can be easily imparted.
The oxygen index is more preferably 25 to 35. However, in the flat cable shielding material of the present invention, the conductive flame retardant layer 3 is separated from the conductive thermal adhesive layer 4 and thus formed separately. Even if the content of the flame retarder is increased, the thermal adhesiveness of the conductive thermal adhesive layer 4 is not impaired, and the flame retardancy having the oxygen index of 25 to 35 can be imparted more easily.
[0032]
Next, the conductive thermal adhesive layer 4 imparts conductivity by dispersing carbon particles in the thermal adhesive resin, and this conductive thermal adhesive resin is coated on the conductive flame retardant layer 3. These are stacked by the above means.
The conductive thermal adhesive layer 4 needs to be thermally bonded to the outer layer of the flat cable and the exposed ground wire of the flat cable. Examples of the thermal adhesive resin include polyester resins and polyolefins. It can be used by appropriately selecting from resin based resins (including ionomers and other acid-modified polyolefin based resins), polystyrene based resins, polyamide based resins, acrylic based resins, polyvinyl ether based resins, rubber based resins and the like.
[0033]
In particular, a polyester film is often used for the outer layer of the flat cable. In that case, a polyester resin can be suitably used as the heat-adhesive resin. This polyester-based resin is a saturated copolyester resin, and includes a resin composition mainly composed of a resin having a glass transition point of −50 to 80 ° C. and a weight average molecular weight in the range of 7000 to 50000. Those are preferred.
In addition, about the carbon particle contained in the said heat bondable resin, since the shape, a particle diameter, content, etc. are the same as that of the case of the said electroconductive flame-retardant layer 3, description is abbreviate | omitted here.
[0034]
【Example】
Hereinafter, the present invention will be described more specifically with reference to examples.
[Example 1]
As shown in FIG. 1, a PET film having a thickness of 12 μm is used as a flexible insulating substrate 1, and a metal thin film layer (shield layer) 2 is formed on one surface thereof with a thickness of 0.1 μm. An aluminum vapor-deposited layer is formed, and a coating solution for a conductive flame retardant layer having the following composition is applied on the aluminum vapor-deposited layer by a microbar coating method so that the thickness when dried is 20 μm and dried. After forming the conductive flame retardant layer 3, a coating solution for the conductive thermal adhesive layer having the following composition is further formed thereon by a microbar coating method so that the thickness when dried becomes 10 μm. The conductive thermal adhesive layer 4 was formed by coating and drying to produce the flat cable shield material 10 of Example 1.
[0035]
(Composition of coating solution for conductive flame retardant layer)
Synthetic resin (binder) (saturated copolymer polyester resin) 60 parts by weight
25 parts by weight of carbon particles (granular carbon, particle size 0.1 to 1.0 μm)
Flame retardant imparting agent
Bromine flame retardant 10 parts by weight
5 parts by weight of antimony trioxide
10 parts by weight of aluminum hydroxide
170 parts by weight of solvent (toluene: MEK weight ratio 1: 1)
(Note) MEK is methyl ethyl ketone.
[0036]
(Composition of coating solution for conductive thermal adhesive layer)
Thermal adhesive resin (saturated copolymer polyester resin) 60 parts by weight
25 parts by weight of carbon particles (granular carbon, particle size 0.1 to 1.0 μm)
Solvent (toluene: MEK weight ratio 1: 1) 140 parts by weight
[0037]
The surface specific resistance of the conductive thermal bonding layer 4 of the flat cable shielding material 10 produced as described above was 4Ω / □. The flame retardancy was an oxygen index of 29.
Next, using this flat cable shielding material 10, a shielded flat cable 100 having the configuration shown in FIGS. 2A and 2B was produced as follows.
That is, as a flat cable, a conductor 5 made of tinned annealed copper foil and a ground wire 6 are arranged in parallel at a predetermined interval, covered with a flat cable covering material 7 from both sides, heated and pressurized to conduct the conductor 5 and the ground. After using the flat cable produced by embedding and integrating the wire 6, the covering material 7 on one side of the ground wire 6 of the flat cable is partially cut in the length direction to expose the ground wire 6, The outer periphery of the flat cable is placed with the shield material 10 for the flat cable so that the conductive thermal adhesive layer 4 faces inward, and both ends are overlapped. To produce a shielded flat cable 100.
[0038]
The shielded flat cable 100 produced in this way has the exposed portion of the ground wire 6 and the metal thin film layer (shield layer) 2 of the flat cable shield member 10 heated and pressed to form the conductive thermal adhesive layer 4. Via the conductive flame retardant layer 3, it is easily conducted at the ground wire-shield layer conducting portion 8, and excellent shielding properties are imparted to the flat cable, and it also has excellent slidability and flame retardancy. Also, it passed the UL flame retardant test.
[0039]
【Effect of the invention】
As described above in detail, according to the present invention, a flat cable shielding material used for imparting electromagnetic shielding properties to a flat cable, which has excellent flame retardancy and electromagnetic shielding properties, and is also resistant to sliding. In addition to mobility (bending resistance), it has excellent thermal adhesion to flat cable sheathing and conductive thermal adhesion to ground wire (metal), and it is easy to attach to flat cables, and it is economical In addition, there is an effect that it is possible to provide an excellent flat cable shielding material with high productivity.
In addition, by producing a shielded flat cable using the flat cable shielding material of the present invention, it has excellent flame retardancy and electromagnetic shielding properties, and performance such as sliding resistance (flexibility). The effect is that an excellent shielded flat cable can be provided with good productivity and economy.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view showing a configuration of an embodiment of a shield material for a flat cable of the present invention.
FIG. 2 is a diagram for explaining the configuration of an embodiment of a shielded flat cable manufactured using the flat cable shield material of the present invention, wherein (a) is a partially cutaway plan view, and (b). These are the expanded sectional views in the AA line of (A).
[Explanation of symbols]
1 Insulating base material with flexibility
2 Metal thin film layer (shield layer)
3 Conductive flame retardant layer
4 Conductive thermal adhesive layer
5 Conductor
6 Ground line
7 Flat cable sheathing
8 Ground line-shield layer conduction part
10 Shielding material for flat cable
100 Flat cable with shield

Claims (4)

On one side of a flexible insulating substrate, at least a metal thin film layer, a conductive flame retardant layer containing carbon particles and a flame retardant imparting agent in a synthetic resin, carbon in a thermal adhesive resin A flat cable shielding material, wherein conductive heat-bonding layers containing particles are sequentially laminated and the metal thin film layer is a metal vapor deposition layer .   2. The insulating base material having flexibility is a biaxially stretched polyethylene terephthalate film, and the metal thin film layer is an aluminum vapor deposition layer having a thickness of 0.04 to 0.2 [mu] m. Shield material for flat cable.   The carbon particles contained in the conductive flame retardant layer and the conductive thermal adhesive layer are spherical or granular carbon particles having a particle diameter of 0.01 to 20 μm, and the content of the carbon particles in each layer is It is 10 to 30 weight%, The shielding material for flat cables of Claim 1 or 2 characterized by the above-mentioned. The flat cable shield material according to any one of claims 1 to 3 is positioned so that the conductive thermal adhesive layer side of the shield material is in contact with the flat cable, and heated and pressurized on the outer periphery of the flat cable. A flat cable with shield, which is integrated and provided with a shield function for the flat cable.

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