WO2011111616A1 - Flexible flat cable - Google Patents

Flexible flat cable Download PDF

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Publication number
WO2011111616A1
WO2011111616A1 PCT/JP2011/055032 JP2011055032W WO2011111616A1 WO 2011111616 A1 WO2011111616 A1 WO 2011111616A1 JP 2011055032 W JP2011055032 W JP 2011055032W WO 2011111616 A1 WO2011111616 A1 WO 2011111616A1
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WO
WIPO (PCT)
Prior art keywords
flat cable
flexible flat
layer
laminated
insulating layer
Prior art date
Application number
PCT/JP2011/055032
Other languages
French (fr)
Japanese (ja)
Inventor
佳英 諏佐
岡崎　裕
佐藤　禎倫
Original Assignee
株式会社フジクラ
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Application filed by 株式会社フジクラ filed Critical 株式会社フジクラ
Publication of WO2011111616A1 publication Critical patent/WO2011111616A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/29—Protection against damage caused by extremes of temperature or by flame
    • H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
    • 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
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin 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
    • 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
    • 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
    • B32B27/286—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 polysulphones; polysulfides
    • 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
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • 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
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • 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
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions
    • B32B3/08—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions characterised by added members at particular parts
    • 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
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/42—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes polyesters; polyethers; polyacetals
    • H01B3/421—Polyesters
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/306—Resistant to heat
    • B32B2307/3065—Flame resistant or retardant, fire resistant or retardant
    • 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
    • B32B2457/00—Electrical equipment
    • 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
    • B32B2457/00—Electrical equipment
    • B32B2457/04—Insulators

Definitions

  • the present invention relates to a flexible flat cable.
  • a flexible flat cable generally has a configuration in which a plurality of conductors arranged side by side are integrated by sandwiching them with an insulating film with an adhesive.
  • Patent Document 1 discloses a flexible flat cable in which a polyimide layer is laminated on an outer surface of an insulating film via an adhesive layer (Patent Document 1).
  • the present invention has been made in view of the above circumstances, and an object thereof is to provide a flexible flat cable having excellent fire resistance.
  • the present inventors thought that the above-mentioned problem might have occurred for the following reason. That is, the pressure-sensitive adhesive layer between the insulating film and the polyimide layer is thermally damaged by the fire, whereby the adhesiveness of the pressure-sensitive adhesive layer is lowered and the polyimide layer is peeled off from the pressure-sensitive adhesive layer. As a result, the flammable insulating film is ignited and the entire cable is burned.
  • the present inventors excluded the pressure-sensitive adhesive layer from between the insulating film and the polyimide layer, and tried to laminate the polyimide layer directly on the insulating film. As a result, it was found that the cable fire resistance was greatly improved. Thus, the present inventors have completed the following invention.
  • the present invention includes a plurality of conductors and a pair of laminated insulators sandwiching these conductors, and each of the laminated insulators is selected from the group consisting of polyolefin resins, polyphenylene sulfide resins, and polyester resins.
  • a flexible flat cable having a polyimide layer.
  • the insulating layer contains at least one selected from the group consisting of polyolefin resin, polyphenylene sulfide resin, and polyester resin, and is easy to burn.
  • the polyimide layer is directly laminated on the surface opposite to the adhesive layer with respect to the insulating layer. For this reason, when the flexible flat cable is exposed to fire, there is no layer that is thermally damaged, and peeling of the polyimide layer from the insulating layer due to the thermal damage of the layer is sufficiently prevented. Therefore, ignition of the flammable insulating layer is prevented and the entire flexible flat cable is prevented from burning. That is, excellent fire resistance can be obtained.
  • the outermost layer is a polyimide layer, and the mechanical strength of the polyimide layer is large. For this reason, it is also possible to improve the wear strength of the flexible flat cable.
  • the polyimide layer preferably has a thickness of 1 to 10 ⁇ m.
  • the shrinkage rate of the polyimide layer is reduced. For this reason, when sliding a flexible flat cable, it becomes difficult to produce peeling. Moreover, more excellent fire resistance can be obtained. Moreover, the fall of the softness
  • the thickness of the polyimide layer is more preferably 1 to 5 ⁇ m.
  • the polyimide layer has a thickness of 1 to 3 ⁇ m.
  • the insulating layer preferably contains the polyester resin.
  • the adhesive layer includes a resin and an additive selected from the group consisting of a stabilizer and a plasticizer, and the total content of the resin and the additive in the adhesive layer Is preferably 100% by mass.
  • the flame retardant is not included in the adhesive layer. For this reason, the fall of the adhesive force of the contact bonding layer with respect to the surface of an insulating layer is suppressed, and peeling with a contact bonding layer and an insulating layer can be suppressed more fully.
  • the material cost is suppressed by not using the flame retardant, the price of the flexible flat cable can be reduced.
  • one laminated insulator of the pair of laminated insulators is shorter than the other laminated insulator, and both ends of the conductor may be exposed.
  • a reinforcing plate may be further provided on the outer surface side of the polyimide layer of at least one of the pair of laminated insulators.
  • a flexible flat cable having excellent fire resistance is provided.
  • FIG. 2 is a cross-sectional view taken along line II-II in FIG. It is a figure which shows one process of manufacturing the flexible flat cable of FIG.
  • FIG. 1 is an end view showing an embodiment of a flexible flat cable according to the present invention
  • FIG. 2 is a sectional view taken along line II-II in FIG.
  • the flexible flat cable 100 includes a plurality of conductors 1 and a pair of laminated insulators 2 ⁇ / b> A and 2 ⁇ / b> B that sandwich the conductors 1.
  • the laminated insulator 2A is laminated on the insulating layer 3, the one surface 3a on the conductor 1 side of the insulating layer 3, and adhered to the conductor 1, and the other of the insulating layer 3 on the opposite side of the conductor 1 And a polyimide layer 5 directly laminated on the surface 3b.
  • the laminated insulator 2B is laminated on the insulating layer 3, the one surface 3a on the conductor 1 side of the insulating layer 3, and bonded to the conductor 1, and on the opposite side of the conductor 1 of the insulating layer 3. And a polyimide layer 5 directly laminated on the other surface 3b.
  • the laminated insulator 2B is provided with reinforcing plates 6 at both ends of the outer surface of the polyimide layer 5.
  • the plurality of conductors 1 are sandwiched between the adhesive layer 4 of the laminated insulator 2A and the adhesive layer 4 of the laminated insulator 2B.
  • the tape-like laminated insulator 2A is shorter than the laminated insulator 2B, and both ends of the conductor 1 are exposed.
  • the insulating layer 3 includes at least one selected from the group consisting of polyolefin resins, polyphenylene sulfide resins, and polyester resins.
  • the insulating layer 3 contains at least one selected from the group consisting of polyolefin resin, polyphenylene sulfide resin, and polyester resin, and is easy to burn.
  • the polyimide layer 5 is directly laminated on the surface 3 b opposite to the conductor 1 with respect to the insulating layer 3. For this reason, when the flexible flat cable 100 is exposed to fire, there is no layer that is thermally damaged, and peeling of the polyimide layer 5 from the insulating layer 3 due to the thermal damage of the layer is sufficiently prevented. The Accordingly, ignition of the flammable insulating layer 3 and the entire flexible flat cable 100 are prevented from burning. That is, excellent fire resistance can be obtained.
  • the outermost layer is the polyimide layer 5, and the mechanical strength of the polyimide layer 5 is large. For this reason, it becomes possible to improve the wear strength of the flexible flat cable 100.
  • the conductor 1 As the conductor 1, a metal wire such as a copper wire, a copper alloy wire, or an aluminum wire can be used. Also, the conductor 1 can be made by plating the surface of the metal wire with tin, silver or the like. As the conductor 1, a conductor having a rectangular cross section (flat rectangular conductor) is usually used, but a conductor having a circular section may be used. Moreover, although the number of the conductors 1 is plural in this embodiment, the number of the conductors 1 may be one.
  • the insulating layer 3 is for adjusting transmission characteristics and electrical characteristics including impedance control.
  • resin contained in the insulating layer 3 polyolefin resin, polyphenylene sulfide resin or polyester resin is used. These can be used alone or in combination of two or more.
  • polystyrene resin examples include polyethylene, ethylene-vinyl acetate copolymer (EVA), ethylene-ethyl acrylate copolymer (EEA), ethylene-methyl acrylate copolymer, ethylene-ethyl methacrylate copolymer, ethylene-1 -Butene copolymer, ethylene- ⁇ olefin copolymer, ethylene-propylene diene rubber (EPDM), polytetrafluoroethylene (PTFE), polypropylene, ethylene-propylene copolymer and polyvinyl chloride (PVC) . These can be used alone or in combination of two or more.
  • EVA ethylene-vinyl acetate copolymer
  • EAA ethylene-ethyl acrylate copolymer
  • EPDM ethylene- ⁇ olefin copolymer
  • EPDM ethylene-propylene diene rubber
  • PTFE polytetrafluoroethylene
  • PVC polyvin
  • the polypropylene may be foamed polypropylene or non-foamed polypropylene.
  • polyester resin examples include polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, and polybutylene naphthalate.
  • polyester resin is preferably used because of its low cost.
  • polyethylene terephthalate is most preferably used because it is particularly excellent in heat resistance.
  • the thickness of the insulating layer 3 is appropriately adjusted according to the impedance setting value of the flexible flat cable 100, but is usually 35 to 100 ⁇ m, preferably 35 to 50 ⁇ m.
  • the adhesive layer 4 is obtained by curing the adhesive layer.
  • the adhesive layer 4 is composed of an adhesive composition, and the adhesive composition includes an adhesive resin and an additive.
  • the adhesive resin examples include polyester resins, olefin resins, ethyl vinyl ether (EVE) resins, and polyvinyl chloride (PVC) resins.
  • the resin contained in the adhesive layer 4 is a cured product of the adhesive resin.
  • Additives include flame retardants, stabilizers and plasticizers.
  • the adhesive layer 4 preferably does not contain a flame retardant as an additive.
  • the total content of the resin in the adhesive layer 4 and at least one additive selected from the group consisting of a stabilizer and a plasticizer is preferably 100% by mass.
  • a decrease in the adhesion force of the adhesive layer 4 to the surface 3a of the insulating layer 3 is suppressed, and peeling between the adhesive layer 4 and the insulating layer 3 can be more sufficiently suppressed.
  • material costs can be reduced. For this reason, the price of the flexible flat cable 100 can be reduced.
  • Examples of the flame retardant include metal hydrates such as magnesium hydroxide, aluminum hydroxide, and titanium dioxide, antimony trioxide, calcium carbonate, triphenyl phosphate, zinc borate, and decabromodiphenyl oxide. These can be used alone or in combination of two or more.
  • Examples of the stabilizer include benzophenone and oleic acid amide, and examples of the plasticizer include bisphenol A glycidyl ether and phenol. These can be used alone or in combination of two or more.
  • the thickness of the adhesive layer 4 is usually 20 to 50 ⁇ m, preferably 20 to 30 ⁇ m.
  • the polyimide layer 5 is usually made of a polyimide resin. However, the polyimide layer 5 may contain an additive or the like as long as it is in a trace amount in addition to the polyimide resin.
  • the thickness of the polyimide layer 5 is preferably 1 to 10 ⁇ m. In this case, the shrinkage rate of the polyimide layer 5 becomes small. For this reason, when sliding the flexible flat cable 100, it becomes difficult to produce peeling. Moreover, more excellent fire resistance can be obtained. Moreover, it can also suppress that the softness
  • the thickness of the polyimide layer 5 is more preferably 1 to 5 ⁇ m, still more preferably 1 to 3 ⁇ m.
  • the reinforcing plate 6 is not particularly limited as long as it can reinforce the laminated insulator 2B.
  • the reinforcing plate 6 for example, polyethylene terephthalate resin (PET) or polypropylene resin (PP) can be used.
  • FIG. 3 is a diagram illustrating one process for manufacturing the flexible flat cable of FIG. 1.
  • laminated insulating tapes 12A and 12B are prepared in which an adhesive layer 14 is laminated on one surface 3a of the insulating layer 3 and a polyimide layer 5 is laminated directly on the other surface 3b. At this time, as the laminated insulating tape 12A, a tape shorter than the laminated insulating tape 12B is prepared.
  • the adhesive layer 14 is obtained by dissolving an adhesive resin in a solvent to prepare an adhesive solution, applying the adhesive solution to the surface 3a of the insulating layer 3, and then heating and drying. be able to. At this time, the heating temperature is set so as not to cure the adhesive layer 14.
  • the polyimide layer 5 is formed by applying a solution containing a polyimide resin to the surface 3b of the insulating layer 3 and then heating and drying, or using a precursor solution containing a polyamide resin as a polyimide resin precursor on the surface of the insulating layer 3. It can be directly laminated on the insulating layer 3 by applying to 3b and imidizing by heating.
  • a plurality of conductors 1 are prepared. Subsequently, the plurality of conductors 1, the laminated insulating tapes 12A and 12B, and the reinforcing plate 6 arranged in parallel are arranged as shown in FIG. That is, the plurality of conductors 1 are arranged so as to be sandwiched between the laminated insulating tapes 12A and 12B. Further, the reinforcing plate 6 is disposed on the polyimide layer 5 side of the laminated insulating tape 12B. At this time, the plurality of conductors 1 are arranged with the adhesive layers 14 of the laminated insulating tapes 12A and 12B facing each other.
  • the laminated insulating tapes 12A and 12B are arranged so that both ends of the conductor 1 are exposed when the conductor 1 is sandwiched between the laminated insulating tapes 12A and 12B. Then, the laminated insulating tapes 12A and 12B are heated and pressed using, for example, a thermal laminator, whereby the plurality of conductors 1 are sandwiched between the laminated insulating tapes 12A and 12B and integrated. The adhesive layer 14 is cured by heating to become the adhesive layer 4.
  • the flexible flat cable 100 is obtained as described above.
  • the present invention is not limited to the above embodiment.
  • the reinforcing plates 6 are provided at both ends of the polyimide layer 5 of the laminated insulator 2B.
  • the reinforcing plates 6 may be provided only at one end of the polyimide layer 5 of the laminated insulator 2B.
  • the reinforcing plate 6 can be omitted when the total thickness of the insulating layer 3 and the polyimide layer 5 is large and there is no need for reinforcement.
  • the reinforcement board 6 is provided only in the polyimide layer 5 of the laminated insulator 2B, you may provide in the polyimide layer 5 of the laminated insulator 2A.
  • Example 1 Two laminated insulating tapes having a thickness of 58 ⁇ m in which an adhesive layer having a thickness of 30 ⁇ m and a polyimide resin having a thickness of 3 ⁇ m were directly laminated on both surfaces of an insulating layer made of polyethylene terephthalate having a thickness of 25 ⁇ m were prepared.
  • the conductors were arranged in parallel and sandwiched between the two laminated insulating tapes described above. Then, the two laminated insulating tapes were integrated by heating and pressurizing at 170 ° C. and 0.25 MPa for 2 seconds using a thermal laminator. At this time, the conductor was sandwiched with the adhesive layers of the two laminated insulating tapes facing each other.
  • Example 1 A polyimide layer is formed by extruding a polyimide resin, and this polyimide layer is coated with an adhesive (5000 NS manufactured by Nitto Denko Corporation) on the side of the insulating layer on which the adhesive layer is laminated.
  • An adhesive 5000 NS manufactured by Nitto Denko Corporation
  • a flexible flat cable was obtained in the same manner as in Example 1 except that a laminated insulating tape was produced by laminating the film.
  • the fire resistance was evaluated by conducting a vertical combustion test (VW-1 test) on the flexible flat cables obtained in Example 1 and Comparative Example 1.
  • the VW-1 test was performed based on UL1581-1080. That is, the flexible flat cable obtained in Example 1 and Comparative Example 1 is hung vertically, a flag made of unreinforced kraft paper is attached to a predetermined position, absorbent cotton is laid under the flexible flat cable, and a burner (tyryl banner) is used.
  • the test was carried out by exposing the flat cable to flame 5 times. At this time, each flame contact time was 15 seconds.
  • the acceptance criteria satisfy all of the following (i) to (iii).
  • the cable does not continue to burn for more than 60 seconds each time (ii)
  • the flag does not burn or burn more than 25% each time (iii)
  • the flexible flat cable of Example 1 reached the acceptance standard for fire resistance.
  • the flexible flat cable of the comparative example 1 did not reach the acceptance standard regarding fire resistance.
  • Example 1 From the results of Example 1 and Comparative Example 1, it was confirmed that the flexible flat cable of the present invention has excellent fire resistance.
  • SYMBOLS 1 Conductor, 2A, 2B ... Laminated insulator, 3 ... Insulating layer, 4 ... Adhesive layer, 5 ... Polyimide layer, 100 ... Flexible flat cable.

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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Insulated Conductors (AREA)
  • Laminated Bodies (AREA)

Abstract

Provided is a flexible flat cable having excellent fire resistance. The flexible flat cable (100) is equipped with a plurality of conductors (1) and a pair of multilayered insulators (2A, 2B) between which the conductors (1) have been sandwiched. The multilayered insulators (2A, 2B) each comprises an insulating layer (3) comprising at least one resin selected from a group consisting of polyolefin resins, polyphenylene sulfide resins, and polyester resins, an adhesive layer (4) which has been superposed on the surface (3a) of the insulating layer (3) that faces the conductors (1) and which is adherent to the conductors (1), and a polyimide layer (5) directly superposed on the surface (3b) of the insulating layer (3) that is on the reverse side from the conductors (1).

Description

フレキシブルフラットケーブルFlexible flat cable
　本発明は、フレキシブルフラットケーブルに関する。 The present invention relates to a flexible flat cable.
　プリンタ、スキャナ、ノートＰＣ、テレビ、車のパネル等の電子機器内で、電気信号を伝達するために使用される信号ケーブルは、筺体内で折り曲げられて組み込まれることが多い。このため、信号ケーブルには屈曲性（フレキシビリティ）が必要であり、コネクタ接続をはじめとする接続における接続性を考慮してフラット化された構造のものが多い。このようなフラット化された構造のケーブルは、フレキシブルフラットケーブル（ＦＦＣ）と呼称されている。フレキシブルフラットケーブルは一般に、並設された複数本の導体を、接着剤付きの絶縁フィルムで挟んで一体化させた構成を有する。 Signal cables used for transmitting electrical signals in electronic devices such as printers, scanners, notebook PCs, televisions, and car panels are often folded and incorporated in a housing. For this reason, the signal cable needs to be flexible (flexibility), and in many cases, the signal cable has a flattened structure in consideration of connectivity in connection including connector connection. Such a flattened cable is called a flexible flat cable (FFC). A flexible flat cable generally has a configuration in which a plurality of conductors arranged side by side are integrated by sandwiching them with an insulating film with an adhesive.
　このようなフレキシブルフラットケーブルには、近年、安全性の観点から、垂直難燃試験（ＶＷ－１試験）などに合格する程度の高い難燃性が要求されるようになっている。例えば特許文献１では、絶縁フィルムの外面に粘着剤層を介してポリイミド層を積層したフレキシブルフラットケーブルが開示されている（特許文献１）。 In recent years, such a flexible flat cable has been required to have high flame retardance enough to pass a vertical flame retardant test (VW-1 test) from the viewpoint of safety. For example, Patent Document 1 discloses a flexible flat cable in which a polyimide layer is laminated on an outer surface of an insulating film via an adhesive layer (Patent Document 1).
特開２００８－１９８５９２号公報JP 2008-198592 A
　しかし、上記特許文献１に記載のフレキシブルフラットケーブルは、耐火性が不十分であるという課題を有していた。 However, the flexible flat cable described in Patent Document 1 has a problem of insufficient fire resistance.
　本発明は、上記事情に鑑みてなされたものであり、優れた耐火性を有するフレキシブルフラットケーブルを提供することを目的とする。 The present invention has been made in view of the above circumstances, and an object thereof is to provide a flexible flat cable having excellent fire resistance.
　上述したように、絶縁フィルムの外面に粘着剤層を介してポリイミド層を積層したフレキシブルフラットケーブルにおいては、耐火性に十分な改善が見られなかった。このことから、本発明者らは、上記課題が以下の理由により生じたのではないかと考えた。即ち、火によって、絶縁フィルムとポリイミド層との間の粘着剤層が熱的な損傷を受け、これにより粘着剤層の粘着性が低下し、ポリイミド層が粘着剤層から剥離する。その結果、燃えやすい絶縁フィルムに着火が起こり、ケーブル全体が燃えてしまう。そこで、本発明者らは粘着剤層を絶縁フィルムとポリイミド層との間から除外し、ポリイミド層を絶縁フィルムに直接積層してみた。その結果、ケーブルの耐火性に大幅な改善が見られることが判明した。こうして、本発明者らは以下の発明を完成するに至った。 As described above, in the flexible flat cable in which the polyimide layer is laminated on the outer surface of the insulating film via the pressure-sensitive adhesive layer, sufficient improvement in fire resistance was not observed. From this, the present inventors thought that the above-mentioned problem might have occurred for the following reason. That is, the pressure-sensitive adhesive layer between the insulating film and the polyimide layer is thermally damaged by the fire, whereby the adhesiveness of the pressure-sensitive adhesive layer is lowered and the polyimide layer is peeled off from the pressure-sensitive adhesive layer. As a result, the flammable insulating film is ignited and the entire cable is burned. Therefore, the present inventors excluded the pressure-sensitive adhesive layer from between the insulating film and the polyimide layer, and tried to laminate the polyimide layer directly on the insulating film. As a result, it was found that the cable fire resistance was greatly improved. Thus, the present inventors have completed the following invention.
　即ち本発明は、複数本の導体と、これら導体を挟む一対の積層絶縁体とを備え、各々の前記積層絶縁体が、ポリオレフィン系樹脂、ポリフェニレンサルファイド樹脂、及びポリエステル樹脂からなる群より選択される少なくとも１種を含む絶縁層と、前記絶縁層の導体側の一方の面に積層され、前記導体に接着される接着層と、前記絶縁層の前記導体と反対側の他方の面に直接積層されるポリイミド層とを有するフレキシブルフラットケーブルである。 That is, the present invention includes a plurality of conductors and a pair of laminated insulators sandwiching these conductors, and each of the laminated insulators is selected from the group consisting of polyolefin resins, polyphenylene sulfide resins, and polyester resins. An insulating layer containing at least one kind, an adhesive layer that is laminated on one surface of the insulating layer on the conductor side, and adhered to the conductor, and a direct lamination on the other surface of the insulating layer opposite to the conductor. A flexible flat cable having a polyimide layer.
　このフレキシブルフラットケーブルによれば、絶縁層が、ポリオレフィン系樹脂、ポリフェニレンサルファイド樹脂、及びポリエステル樹脂からなる群より選択される少なくとも１種を含んでおり、燃えやすくなっている。しかし、本発明では、ポリイミド層が絶縁層に対し接着層と反対側の面に直接積層されている。このため、フレキシブルフラットケーブルが火にさらされた際に熱的な損傷を受ける層がなくなり、その層の熱的な損傷に起因した、絶縁層に対するポリイミド層の剥離が十分に防止される。従って、燃えやすい絶縁層に着火が起こってフレキシブルフラットケーブル全体が燃えることが防止される。即ち、優れた耐火性を得ることができる。また最外層がポリイミド層になっており、ポリイミド層の機械的強度が大きい。このため、フレキシブルフラットケーブルの摩耗強度を向上させることも可能となる。 According to this flexible flat cable, the insulating layer contains at least one selected from the group consisting of polyolefin resin, polyphenylene sulfide resin, and polyester resin, and is easy to burn. However, in the present invention, the polyimide layer is directly laminated on the surface opposite to the adhesive layer with respect to the insulating layer. For this reason, when the flexible flat cable is exposed to fire, there is no layer that is thermally damaged, and peeling of the polyimide layer from the insulating layer due to the thermal damage of the layer is sufficiently prevented. Therefore, ignition of the flammable insulating layer is prevented and the entire flexible flat cable is prevented from burning. That is, excellent fire resistance can be obtained. Moreover, the outermost layer is a polyimide layer, and the mechanical strength of the polyimide layer is large. For this reason, it is also possible to improve the wear strength of the flexible flat cable.
　上記フレキシブルフラットケーブルにおいては、前記ポリイミド層の厚さが１～１０μｍであることが好ましい。この場合、ポリイミド層の収縮率が小さくなる。このため、フレキシブルフラットケーブルを摺動させる際に剥離が生じにくくなる。またより優れた耐火性を得ることができる。またフレキシブルフラットケーブルが厚くなりすぎることによるフレキシブルフラットケーブルの柔軟性の低下を抑制することもできる。 In the flexible flat cable, the polyimide layer preferably has a thickness of 1 to 10 μm. In this case, the shrinkage rate of the polyimide layer is reduced. For this reason, when sliding a flexible flat cable, it becomes difficult to produce peeling. Moreover, more excellent fire resistance can be obtained. Moreover, the fall of the softness | flexibility of a flexible flat cable by a flexible flat cable becoming too thick can also be suppressed.
　上記フレキシブルフラットケーブルにおいては、前記ポリイミド層の厚さは１～５μｍであることがより好ましい。 In the flexible flat cable, the thickness of the polyimide layer is more preferably 1 to 5 μm.
　上記フレキシブルフラットケーブルにおいては、前記ポリイミド層の厚さが１～３μｍであることが特に好ましい。 In the flexible flat cable, it is particularly preferable that the polyimide layer has a thickness of 1 to 3 μm.
　上記フレキシブルフラットケーブルにおいては、前記絶縁層が前記ポリエステル樹脂を含むことが好ましい。 In the flexible flat cable, the insulating layer preferably contains the polyester resin.
　また上記フレキシブルフラットケーブルにおいては、前記接着層が、樹脂と、安定剤および可塑剤からなる群より選択される添加剤とを含み、前記接着層中の前記樹脂と前記添加剤との合計含有率が１００質量％であることが好ましい。この場合、接着層中に難燃剤が含まれないことになる。このため、絶縁層の表面に対する接着層の接着力の低下が抑制され、接着層と絶縁層との剥離をより十分に抑制することができる。また難燃剤が使用されないことにより、材料費が抑えられるため、フレキシブルフラットケーブルの低価格化を図ることも可能となる。 In the flexible flat cable, the adhesive layer includes a resin and an additive selected from the group consisting of a stabilizer and a plasticizer, and the total content of the resin and the additive in the adhesive layer Is preferably 100% by mass. In this case, the flame retardant is not included in the adhesive layer. For this reason, the fall of the adhesive force of the contact bonding layer with respect to the surface of an insulating layer is suppressed, and peeling with a contact bonding layer and an insulating layer can be suppressed more fully. Moreover, since the material cost is suppressed by not using the flame retardant, the price of the flexible flat cable can be reduced.
　上記フレキシブルフラットケーブルにおいては、前記一対の積層絶縁体のうち一方の積層絶縁体が他方の積層絶縁体よりも短くなっており、前記導体の両端を露出させていてもよい。 In the flexible flat cable, one laminated insulator of the pair of laminated insulators is shorter than the other laminated insulator, and both ends of the conductor may be exposed.
　また上記フレキシブルフラットケーブルにおいては、前記一対の積層絶縁体うち少なくとも一方の積層絶縁体の前記ポリイミド層の外面側に、補強板がさらに設けられていてもよい。 In the flexible flat cable, a reinforcing plate may be further provided on the outer surface side of the polyimide layer of at least one of the pair of laminated insulators.
　本発明によれば、優れた耐火性を有するフレキシブルフラットケーブルが提供される。 According to the present invention, a flexible flat cable having excellent fire resistance is provided.
本発明のフレキシブルフラットケーブルの一実施形態を示す端面図である。It is an end view which shows one Embodiment of the flexible flat cable of this invention. 図１のＩＩ－ＩＩ線に沿った断面図である。FIG. 2 is a cross-sectional view taken along line II-II in FIG. 図１のフレキシブルフラットケーブルを製造する一工程を示す図である。It is a figure which shows one process of manufacturing the flexible flat cable of FIG.
　以下、本発明の実施形態について図１及び図２を用いて詳細に説明する。 Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 and 2.
　図１は、本発明に係るフレキシブルフラットケーブルの一実施形態を示す端面図、図２は、図１のＩＩ－ＩＩ線に沿った断面図である。図１及び図２に示すように、フレキシブルフラットケーブル１００は、複数本の導体１と、これら導体１を挟むテープ状の一対の積層絶縁体２Ａ，２Ｂとを備えている。 FIG. 1 is an end view showing an embodiment of a flexible flat cable according to the present invention, and FIG. 2 is a sectional view taken along line II-II in FIG. As shown in FIGS. 1 and 2, the flexible flat cable 100 includes a plurality of conductors 1 and a pair of laminated insulators 2 </ b> A and 2 </ b> B that sandwich the conductors 1.
　積層絶縁体２Ａは、絶縁層３と、絶縁層３の導体１側の一方の面３ａに積層され、導体１に接着される接着層４と、絶縁層３の導体１と反対側の他方の面３ｂに直接積層されるポリイミド層５とを備える。一方、積層絶縁体２Ｂは、絶縁層３と、絶縁層３の導体１側の一方の面３ａに積層され、導体１に接着される接着層４と、絶縁層３の導体１と反対側の他方の面３ｂに直接積層されるポリイミド層５とを備える。積層絶縁体２Ｂには、ポリイミド層５の外面の両端に補強板６が設けられている。 The laminated insulator 2A is laminated on the insulating layer 3, the one surface 3a on the conductor 1 side of the insulating layer 3, and adhered to the conductor 1, and the other of the insulating layer 3 on the opposite side of the conductor 1 And a polyimide layer 5 directly laminated on the surface 3b. On the other hand, the laminated insulator 2B is laminated on the insulating layer 3, the one surface 3a on the conductor 1 side of the insulating layer 3, and bonded to the conductor 1, and on the opposite side of the conductor 1 of the insulating layer 3. And a polyimide layer 5 directly laminated on the other surface 3b. The laminated insulator 2B is provided with reinforcing plates 6 at both ends of the outer surface of the polyimide layer 5.
　そして、複数本の導体１は、積層絶縁体２Ａの接着層４と、積層絶縁体２Ｂの接着層４とによって挟まれている。 The plurality of conductors 1 are sandwiched between the adhesive layer 4 of the laminated insulator 2A and the adhesive layer 4 of the laminated insulator 2B.
　また図２に示すように、テープ状の積層絶縁体２Ａは、積層絶縁体２Ｂよりも短くなっており、導体１の両端を露出させている。絶縁層３は、ポリオレフィン系樹脂、ポリフェニレンサルファイド樹脂およびポリエステル樹脂からなる群より選択される少なくとも１種を含む。 As shown in FIG. 2, the tape-like laminated insulator 2A is shorter than the laminated insulator 2B, and both ends of the conductor 1 are exposed. The insulating layer 3 includes at least one selected from the group consisting of polyolefin resins, polyphenylene sulfide resins, and polyester resins.
　このフレキシブルフラットケーブル１００によれば、絶縁層３が、ポリオレフィン系樹脂、ポリフェニレンサルファイド樹脂、及びポリエステル樹脂からなる群より選択される少なくとも１種を含んでおり、燃えやすくなっている。しかし、フレキシブルフラットケーブル１００においては、ポリイミド層５が絶縁層３に対し導体１と反対側の面３ｂに直接積層されている。このため、フレキシブルフラットケーブル１００が火にさらされた際に熱的な損傷を受ける層がなくなり、その層の熱的な損傷に起因した、絶縁層３に対するポリイミド層５の剥離が十分に防止される。従って、燃えやすい絶縁層３に着火が起こってフレキシブルフラットケーブル１００全体が燃えることが防止される。即ち、優れた耐火性を得ることができる。またフレキシブルフラットケーブル１００では、最外層がポリイミド層５となっており、ポリイミド層５の機械的強度は大きい。このため、フレキシブルフラットケーブル１００の摩耗強度を向上させることが可能となる。 According to this flexible flat cable 100, the insulating layer 3 contains at least one selected from the group consisting of polyolefin resin, polyphenylene sulfide resin, and polyester resin, and is easy to burn. However, in the flexible flat cable 100, the polyimide layer 5 is directly laminated on the surface 3 b opposite to the conductor 1 with respect to the insulating layer 3. For this reason, when the flexible flat cable 100 is exposed to fire, there is no layer that is thermally damaged, and peeling of the polyimide layer 5 from the insulating layer 3 due to the thermal damage of the layer is sufficiently prevented. The Accordingly, ignition of the flammable insulating layer 3 and the entire flexible flat cable 100 are prevented from burning. That is, excellent fire resistance can be obtained. Moreover, in the flexible flat cable 100, the outermost layer is the polyimide layer 5, and the mechanical strength of the polyimide layer 5 is large. For this reason, it becomes possible to improve the wear strength of the flexible flat cable 100.
　以下、導体１、絶縁層３、接着層４、ポリイミド層５及び補強板６の各々について詳細に説明する。 Hereinafter, each of the conductor 1, the insulating layer 3, the adhesive layer 4, the polyimide layer 5, and the reinforcing plate 6 will be described in detail.
　（導体）
　導体１としては、銅線、銅合金線、アルミニウム線等の金属線を用いることができる。また、上記金属線の表面にスズや銀等のめっきを施したものを導体１として用いることもできる。導体１としては通常、断面が矩形状のもの（平角導体）が用いられるが、断面が円形のものであってもよい。また本実施形態では導体１の本数が複数本であるが、導体１は１本であってもよい。 (conductor)
As the conductor 1, a metal wire such as a copper wire, a copper alloy wire, or an aluminum wire can be used. Also, the conductor 1 can be made by plating the surface of the metal wire with tin, silver or the like. As the conductor 1, a conductor having a rectangular cross section (flat rectangular conductor) is usually used, but a conductor having a circular section may be used. Moreover, although the number of the conductors 1 is plural in this embodiment, the number of the conductors 1 may be one.
　（絶縁層）
　絶縁層３は、インピーダンス制御をはじめとした伝送特性及び電気特性の調整を行うためのものである。絶縁層３に含まれる樹脂としては、ポリオレフィン系樹脂、ポリフェニレンサルファイド樹脂又はポリエステル樹脂が用いられる。これらは単独で又は２種以上を組み合わせて使用することができる。ポリオレフィン系樹脂としては、例えばポリエチレン、エチレン－酢酸ビニル共重合体（ＥＶＡ）、エチレン－エチルアクリレート共重合体（ＥＥＡ）、エチレン－メチルアクリレート共重合体、エチレン－エチルメタクリレート共重合体、エチレン－１－ブテン共重合体、エチレン－αオレフィン共重合体、エチレン－プロピレンジエンゴム（ＥＰＤＭ）、ポリテトラフルオロエチレン（ＰＴＦＥ）、ポリプロピレン、エチレン-プロピレン共重合体およびポリ塩化ビニル（ＰＶＣ）などが挙げられる。これらは単独で又は２種以上を組み合わせて用いることができる。ここで、ポリプロピレンは、発泡ポリプロピレンでも非発泡ポリプロピレンであってもよい。ポリエステル樹脂としては、ポリエチレンテレフタレート、ポリエチレンナフタレート、ポリブチレンテレフタレートおよびポリブチレンナフタレートなどが挙げられる。 (Insulating layer)
The insulating layer 3 is for adjusting transmission characteristics and electrical characteristics including impedance control. As the resin contained in the insulating layer 3, polyolefin resin, polyphenylene sulfide resin or polyester resin is used. These can be used alone or in combination of two or more. Examples of the polyolefin resin include polyethylene, ethylene-vinyl acetate copolymer (EVA), ethylene-ethyl acrylate copolymer (EEA), ethylene-methyl acrylate copolymer, ethylene-ethyl methacrylate copolymer, ethylene-1 -Butene copolymer, ethylene-α olefin copolymer, ethylene-propylene diene rubber (EPDM), polytetrafluoroethylene (PTFE), polypropylene, ethylene-propylene copolymer and polyvinyl chloride (PVC) . These can be used alone or in combination of two or more. Here, the polypropylene may be foamed polypropylene or non-foamed polypropylene. Examples of the polyester resin include polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, and polybutylene naphthalate.
　中でも、安価であることから、ポリエステル樹脂が好ましく用いられる。ポリエステル樹脂の中でも、ポリエチレンテレフタレートが、特に耐熱性に優れることから、最も好ましく用いられる。 Above all, polyester resin is preferably used because of its low cost. Among polyester resins, polyethylene terephthalate is most preferably used because it is particularly excellent in heat resistance.
　絶縁層３の厚さは、フレキシブルフラットケーブル１００のインピーダンスの設定値に応じて適宜調整されるものであるが、通常は３５～１００μｍであり、好ましくは３５～５０μｍである。 The thickness of the insulating layer 3 is appropriately adjusted according to the impedance setting value of the flexible flat cable 100, but is usually 35 to 100 μm, preferably 35 to 50 μm.
　（接着層）
　接着層４は、接着剤層を硬化させて得られるものであり、接着剤層４は、接着剤組成物で構成され、接着剤組成物は、接着性樹脂と、添加剤とを含む。 (Adhesive layer)
The adhesive layer 4 is obtained by curing the adhesive layer. The adhesive layer 4 is composed of an adhesive composition, and the adhesive composition includes an adhesive resin and an additive.
　接着性樹脂としては、例えばポリエステル系樹脂、オレフィン系樹脂、エチルビニルエーテル（ＥＶＥ）系樹脂およびポリ塩化ビニル（ＰＶＣ）系樹脂が挙げられる。接着層４に含まれる樹脂は、上記接着性樹脂の硬化物となる。 Examples of the adhesive resin include polyester resins, olefin resins, ethyl vinyl ether (EVE) resins, and polyvinyl chloride (PVC) resins. The resin contained in the adhesive layer 4 is a cured product of the adhesive resin.
　添加剤としては、難燃剤、安定剤および可塑剤などが挙げられる。 Additives include flame retardants, stabilizers and plasticizers.
　接着層４は、添加剤として難燃剤を含まないことが好ましい。別言すると、接着層４中の樹脂と、安定剤及び可塑剤からなる群より選択される少なくとも１種の添加剤との合計含有率が１００質量％であることが好ましい。この場合、絶縁層３の表面３ａに対する接着層４の接着力の低下が抑制され、接着層４と絶縁層３との剥離をより十分に抑制することができる。また難燃剤が使用されないことにより、材料費が抑えられる。このため、フレキシブルフラットケーブル１００の低価格化を図ることも可能となる。難燃剤としては、水酸化マグネシウム、水酸化アルミニウム、二酸化チタン等の金属水和物、三酸化アンチモン、炭酸カルシウム、トリフェニルフォスフェート、ホウ酸亜鉛およびデカブロモジフェニルオキシドなどが挙げられる。これらは単独で又は２種以上を組み合わせて使用することが可能である。安定剤としては、ベンゾフェノンおよびオレイン酸アミドなどが挙げられ、可塑剤としては、ビスフェノールＡグリシジルエーテルおよびフェノールなどが挙げられる。これらは単独で又は２種以上を組み合わせて使用することが可能である。 The adhesive layer 4 preferably does not contain a flame retardant as an additive. In other words, the total content of the resin in the adhesive layer 4 and at least one additive selected from the group consisting of a stabilizer and a plasticizer is preferably 100% by mass. In this case, a decrease in the adhesion force of the adhesive layer 4 to the surface 3a of the insulating layer 3 is suppressed, and peeling between the adhesive layer 4 and the insulating layer 3 can be more sufficiently suppressed. In addition, since no flame retardant is used, material costs can be reduced. For this reason, the price of the flexible flat cable 100 can be reduced. Examples of the flame retardant include metal hydrates such as magnesium hydroxide, aluminum hydroxide, and titanium dioxide, antimony trioxide, calcium carbonate, triphenyl phosphate, zinc borate, and decabromodiphenyl oxide. These can be used alone or in combination of two or more. Examples of the stabilizer include benzophenone and oleic acid amide, and examples of the plasticizer include bisphenol A glycidyl ether and phenol. These can be used alone or in combination of two or more.
　接着層４の厚さは通常は２０～５０μｍであり、好ましくは２０～３０μｍである。 The thickness of the adhesive layer 4 is usually 20 to 50 μm, preferably 20 to 30 μm.
　（ポリイミド層）
　ポリイミド層５は通常、ポリイミド樹脂からなる。但し、ポリイミド層５は、上記ポリイミド樹脂のほか、微量であれば添加剤等を含んでいてもよい。 (Polyimide layer)
The polyimide layer 5 is usually made of a polyimide resin. However, the polyimide layer 5 may contain an additive or the like as long as it is in a trace amount in addition to the polyimide resin.
　ポリイミド層５の厚さは１～１０μｍであることが好ましい。この場合、ポリイミド層５の収縮率が小さくなる。このため、フレキシブルフラットケーブル１００を摺動させる際に剥離が生じにくくなる。またより優れた耐火性を得ることができる。またフレキシブルフラットケーブル１００の柔軟性が低下することを抑制することもできる。ポリイミド層５の厚さは、より好ましくは１～５μｍであり、さらに好ましくは１～３μｍである。 The thickness of the polyimide layer 5 is preferably 1 to 10 μm. In this case, the shrinkage rate of the polyimide layer 5 becomes small. For this reason, when sliding the flexible flat cable 100, it becomes difficult to produce peeling. Moreover, more excellent fire resistance can be obtained. Moreover, it can also suppress that the softness | flexibility of the flexible flat cable 100 falls. The thickness of the polyimide layer 5 is more preferably 1 to 5 μm, still more preferably 1 to 3 μm.
　（補強板）
　補強板６は、積層絶縁体２Ｂを補強することができるものであれば特に制限されない。補強板６としては、例えばポリエチレンテレフタレート樹脂（ＰＥＴ）又はポリプロピレン樹脂（ＰＰ）などを用いることができる。 (Reinforcement plate)
The reinforcing plate 6 is not particularly limited as long as it can reinforce the laminated insulator 2B. As the reinforcing plate 6, for example, polyethylene terephthalate resin (PET) or polypropylene resin (PP) can be used.
　次に、上記フレキシブルフラットケーブル１００の製造方法について図３を用いて説明する。図３は、図１のフレキシブルフラットケーブルを製造する一工程を示す図である。 Next, a method for manufacturing the flexible flat cable 100 will be described with reference to FIG. FIG. 3 is a diagram illustrating one process for manufacturing the flexible flat cable of FIG. 1.
　まず、図３に示すように、絶縁層３の一方の表面３ａに接着剤層１４を積層させ、他方の表面３ｂにポリイミド層５を直接積層させた積層絶縁テープ１２Ａ，１２Ｂを用意する。このとき、積層絶縁テープ１２Ａとしては、積層絶縁テープ１２Ｂよりも短いものを用意する。 First, as shown in FIG. 3, laminated insulating tapes 12A and 12B are prepared in which an adhesive layer 14 is laminated on one surface 3a of the insulating layer 3 and a polyimide layer 5 is laminated directly on the other surface 3b. At this time, as the laminated insulating tape 12A, a tape shorter than the laminated insulating tape 12B is prepared.
　ここで、接着剤層１４は、接着性樹脂を溶媒中に溶解させて接着剤溶液を調製し、この接着剤溶液を絶縁層３の表面３ａに塗布した後、加熱し、乾燥することによって得ることができる。このとき、加熱温度は、接着剤層１４を硬化させない程度の温度とする。 Here, the adhesive layer 14 is obtained by dissolving an adhesive resin in a solvent to prepare an adhesive solution, applying the adhesive solution to the surface 3a of the insulating layer 3, and then heating and drying. be able to. At this time, the heating temperature is set so as not to cure the adhesive layer 14.
　またポリイミド層５は、ポリイミド樹脂を含む溶液を絶縁層３の表面３ｂに塗布した後、加熱し乾燥する方法や、ポリイミド樹脂の前駆体であるポリアミド樹脂を含む前駆体溶液を絶縁層３の表面３ｂに塗布し、加熱によりイミド化する方法によって絶縁層３に直接積層させることができる。 The polyimide layer 5 is formed by applying a solution containing a polyimide resin to the surface 3b of the insulating layer 3 and then heating and drying, or using a precursor solution containing a polyamide resin as a polyimide resin precursor on the surface of the insulating layer 3. It can be directly laminated on the insulating layer 3 by applying to 3b and imidizing by heating.
　そして、複数本の導体１を用意する。続いて、並列に配置した複数本の導体１、積層絶縁テープ１２Ａ，１２Ｂ及び補強板６を図３に示すように配置する。即ち、複数本の導体１を、上述した積層絶縁テープ１２Ａ，１２Ｂで挟むように配置する。また、補強板６を積層絶縁テープ１２Ｂのポリイミド層５側に配置する。このとき、複数本の導体１は、積層絶縁テープ１２Ａ，１２Ｂの接着剤層１４同士を互いに向かい合わせた状態で配置する。また積層絶縁テープ１２Ａ，１２Ｂで導体１を挟んだ際に導体１の両端が露出するように積層絶縁テープ１２Ａ，１２Ｂを配置する。そして、積層絶縁テープ１２Ａ，１２Ｂを、例えば熱ラミネータを用いて加熱及び加圧することにより、複数本の導体１を積層絶縁テープ１２Ａ，１２Ｂで挟み、一体化する。接着剤層１４は加熱により硬化されて接着層４となる。 Then, a plurality of conductors 1 are prepared. Subsequently, the plurality of conductors 1, the laminated insulating tapes 12A and 12B, and the reinforcing plate 6 arranged in parallel are arranged as shown in FIG. That is, the plurality of conductors 1 are arranged so as to be sandwiched between the laminated insulating tapes 12A and 12B. Further, the reinforcing plate 6 is disposed on the polyimide layer 5 side of the laminated insulating tape 12B. At this time, the plurality of conductors 1 are arranged with the adhesive layers 14 of the laminated insulating tapes 12A and 12B facing each other. Further, the laminated insulating tapes 12A and 12B are arranged so that both ends of the conductor 1 are exposed when the conductor 1 is sandwiched between the laminated insulating tapes 12A and 12B. Then, the laminated insulating tapes 12A and 12B are heated and pressed using, for example, a thermal laminator, whereby the plurality of conductors 1 are sandwiched between the laminated insulating tapes 12A and 12B and integrated. The adhesive layer 14 is cured by heating to become the adhesive layer 4.
　以上のようにしてフレキシブルフラットケーブル１００が得られる。 The flexible flat cable 100 is obtained as described above.
　本発明は上記実施形態に限定されるものではない。例えば上記実施形態では、補強板６が積層絶縁体２Ｂのポリイミド層５の両端に設けられているが、補強板６は、積層絶縁体２Ｂのポリイミド層５の一端のみに設けられてもよい。また補強板６は、絶縁層３及びポリイミド層５の合計厚さが大きく、補強の必要がない場合には省略することもできる。さらに上記実施形態では補強板６が積層絶縁体２Ｂのポリイミド層５にのみ設けられているが、積層絶縁体２Ａのポリイミド層５に設けられてもよい。 The present invention is not limited to the above embodiment. For example, in the above embodiment, the reinforcing plates 6 are provided at both ends of the polyimide layer 5 of the laminated insulator 2B. However, the reinforcing plates 6 may be provided only at one end of the polyimide layer 5 of the laminated insulator 2B. The reinforcing plate 6 can be omitted when the total thickness of the insulating layer 3 and the polyimide layer 5 is large and there is no need for reinforcement. Furthermore, in the said embodiment, although the reinforcement board 6 is provided only in the polyimide layer 5 of the laminated insulator 2B, you may provide in the polyimide layer 5 of the laminated insulator 2A.
　以下、実施例及び比較例を挙げて本発明の内容をより具体的に説明するが、本発明は以下の実施例に限定されるものではない。 Hereinafter, the contents of the present invention will be described more specifically with reference to examples and comparative examples, but the present invention is not limited to the following examples.
　（実施例１）
　まず、厚さ２５μｍのポリエチレンテレフタレートからなる絶縁層の両面にそれぞれ、厚さ３０μｍの接着剤層および厚さ３μｍのポリイミド樹脂が直接積層された厚さ５８μｍの積層絶縁テープを２枚用意した。 Example 1
First, two laminated insulating tapes having a thickness of 58 μm in which an adhesive layer having a thickness of 30 μm and a polyimide resin having a thickness of 3 μm were directly laminated on both surfaces of an insulating layer made of polyethylene terephthalate having a thickness of 25 μm were prepared.
　次に、厚さ３５μｍ、幅７００μｍの軟銅線からなる平角導体を４０本用意した。 Next, 40 rectangular conductors made of an annealed copper wire having a thickness of 35 μm and a width of 700 μm were prepared.
　そして、上記導体を並列に配置し、上述した２枚の積層絶縁テープで挟み込んだ。そして、２枚の積層絶縁テープを、熱ラミネータを用いて、１７０℃、０．２５ＭＰａで２秒間、加熱及び加圧することにより一体化した。このとき、導体は、２枚の積層絶縁テープの接着剤層同士を互いに向かい合わせた状態で挟み込むようにした。 Then, the conductors were arranged in parallel and sandwiched between the two laminated insulating tapes described above. Then, the two laminated insulating tapes were integrated by heating and pressurizing at 170 ° C. and 0.25 MPa for 2 seconds using a thermal laminator. At this time, the conductor was sandwiched with the adhesive layers of the two laminated insulating tapes facing each other.
　こうして、フレキシブルフラットケーブルを得た。 Thus, a flexible flat cable was obtained.
　（比較例１）
　ポリイミド層を、ポリイミド樹脂を押出成形することにより形成し、このポリイミド層を、接着剤層を積層した絶縁層の接着剤が積層されていない面側に、粘着剤（日東電工株式会社製５０００ＮＳ）を介して積層して積層絶縁テープを製造したこと以外は実施例１と同様にしてフレキシブルフラットケーブルを得た。 (Comparative Example 1)
A polyimide layer is formed by extruding a polyimide resin, and this polyimide layer is coated with an adhesive (5000 NS manufactured by Nitto Denko Corporation) on the side of the insulating layer on which the adhesive layer is laminated. A flexible flat cable was obtained in the same manner as in Example 1 except that a laminated insulating tape was produced by laminating the film.
　実施例１及び比較例１で得られたフレキシブルフラットケーブルについて、以下のようにして耐火性の評価を行った。 The fire resistance of the flexible flat cables obtained in Example 1 and Comparative Example 1 was evaluated as follows.
　（耐火性）
　耐火性は、実施例１及び比較例１で得られたフレキシブルフラットケーブルについて、垂直燃焼試験（ＶＷ－１試験）を行うことにより評価した。ＶＷ－１試験は、ＵＬ１５８１－１０８０に基づいて行った。即ち、実施例１及び比較例１で得られたフレキシブルフラットケーブルを垂直につるし、所定の位置に無強化クラフト紙からなる旗を取り付け、フレキシブルフラットケーブルの下に脱脂綿を敷き、バーナー（チリルバナー）により、フラットケーブルに５回炎に当てることにより行った。このとき、各回の接炎時間は１５秒間とした。合格基準は、以下の（ｉ）～（ｉｉｉ）の全てを満たすこととした。
（ｉ）各回においてケーブルが６０秒を超えて燃え続けないこと
（ｉｉ）各回で旗が２５％以上燃えたり、焦げたりしないこと
（ｉｉｉ）脱脂綿への着火がないこと (Fire resistance)
The fire resistance was evaluated by conducting a vertical combustion test (VW-1 test) on the flexible flat cables obtained in Example 1 and Comparative Example 1. The VW-1 test was performed based on UL1581-1080. That is, the flexible flat cable obtained in Example 1 and Comparative Example 1 is hung vertically, a flag made of unreinforced kraft paper is attached to a predetermined position, absorbent cotton is laid under the flexible flat cable, and a burner (tyryl banner) is used. The test was carried out by exposing the flat cable to flame 5 times. At this time, each flame contact time was 15 seconds. The acceptance criteria satisfy all of the following (i) to (iii).
(I) The cable does not continue to burn for more than 60 seconds each time (ii) The flag does not burn or burn more than 25% each time (iii) There is no ignition of the absorbent cotton
　その結果、実施例１のフレキシブルフラットケーブルは、耐火性に関し、合格基準に達していた。これに対し、比較例１のフレキシブルフラットケーブルは、耐火性に関し、合格基準に達してなかった。 As a result, the flexible flat cable of Example 1 reached the acceptance standard for fire resistance. On the other hand, the flexible flat cable of the comparative example 1 did not reach the acceptance standard regarding fire resistance.
　実施例１および比較例１の結果より、本発明のフレキシブルフラットケーブルによれば、優れた耐火性を有することが確認された。 From the results of Example 1 and Comparative Example 1, it was confirmed that the flexible flat cable of the present invention has excellent fire resistance.
　１…導体、２Ａ，２Ｂ…積層絶縁体、３…絶縁層、４…接着層、５…ポリイミド層、１００…フレキシブルフラットケーブル。
  DESCRIPTION OF SYMBOLS 1 ... Conductor, 2A, 2B ... Laminated insulator, 3 ... Insulating layer, 4 ... Adhesive layer, 5 ... Polyimide layer, 100 ... Flexible flat cable.

Claims (6)

  1. 　複数本の導体と、
    　これら導体を挟む一対の積層絶縁体とを備え、
    　各々の前記積層絶縁体が、
    　ポリオレフィン系樹脂、ポリフェニレンサルファイド樹脂、及びポリエステル樹脂からなる群より選択される少なくとも１種を含む絶縁層と、
    　前記絶縁層の前記導体側の一方の面に積層され、前記導体に接着される接着層と、
    　前記絶縁層の前記導体と反対側の他方の面に直接積層されるポリイミド層と、
    を有するフレキシブルフラットケーブル。     Multiple conductors,
    A pair of laminated insulators sandwiching these conductors,
    Each of the laminated insulators is
    An insulating layer containing at least one selected from the group consisting of a polyolefin-based resin, a polyphenylene sulfide resin, and a polyester resin;
    An adhesive layer laminated on one surface of the insulating layer on the conductor side and bonded to the conductor;
    A polyimide layer directly laminated on the other surface of the insulating layer opposite to the conductor;
    Flexible flat cable with
  2. 　前記ポリイミド層の厚さが１～１０μｍである、請求項１に記載のフレキシブルフラットケーブル。 The flexible flat cable according to claim 1, wherein the polyimide layer has a thickness of 1 to 10 µm.
  3. 　前記ポリイミド層の厚さが１～５μｍである、請求項１に記載のフレキシブルフラットケーブル。 2. The flexible flat cable according to claim 1, wherein the polyimide layer has a thickness of 1 to 5 μm.
  4. 　前記ポリイミド層の厚さが１～３μｍである、請求項１に記載のフレキシブルフラットケーブル。 The flexible flat cable according to claim 1, wherein the polyimide layer has a thickness of 1 to 3 µm.
  5. 　前記絶縁層が前記ポリエステル樹脂を含む、請求項１～４のいずれか一項に記載のフレキシブルフラットケーブル。 The flexible flat cable according to any one of claims 1 to 4, wherein the insulating layer includes the polyester resin.
  6. 　前記接着層が、樹脂と、安定剤及び可塑剤からなる群より選択される少なくとも１種の添加剤とを含み、
    　前記接着層中の前記樹脂と前記添加剤との合計含有率が１００質量％である、請求項１～５のいずれか一項に記載のフレキシブルフラットケーブル。
          The adhesive layer includes a resin and at least one additive selected from the group consisting of a stabilizer and a plasticizer;
    The flexible flat cable according to any one of claims 1 to 5, wherein a total content of the resin and the additive in the adhesive layer is 100% by mass.
PCT/JP2011/055032 2010-03-10 2011-03-04 Flexible flat cable WO2011111616A1 (en)

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JP2013073693A (en) * 2011-09-26 2013-04-22 Toshiba Tec Corp Flexible cable
CN113348521A (en) * 2019-01-24 2021-09-03 阿莫绿色技术有限公司 Flexible cable jumper structure and method of manufacturing the same

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WO2013187346A1 (en) * 2012-06-15 2013-12-19 住友電気工業株式会社 Flat-cable insulating film and flat cable
JP2020045893A (en) * 2018-09-21 2020-03-26 サンデン・オートモーティブコンポーネント株式会社 Electric compressor

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JPH0636619A (en) * 1992-05-18 1994-02-10 Sumitomo Electric Ind Ltd Flat cable
JP2006120432A (en) * 2004-10-21 2006-05-11 Toray Ind Inc Flat cable
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JPS63133021U (en) * 1987-02-23 1988-08-31
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JPH0636619A (en) * 1992-05-18 1994-02-10 Sumitomo Electric Ind Ltd Flat cable
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Publication number Priority date Publication date Assignee Title
JP2013073693A (en) * 2011-09-26 2013-04-22 Toshiba Tec Corp Flexible cable
CN113348521A (en) * 2019-01-24 2021-09-03 阿莫绿色技术有限公司 Flexible cable jumper structure and method of manufacturing the same

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