EP0953195A1 - Conducteurs electriques isoles - Google Patents

Conducteurs electriques isoles

Info

Publication number
EP0953195A1
EP0953195A1 EP98901226A EP98901226A EP0953195A1 EP 0953195 A1 EP0953195 A1 EP 0953195A1 EP 98901226 A EP98901226 A EP 98901226A EP 98901226 A EP98901226 A EP 98901226A EP 0953195 A1 EP0953195 A1 EP 0953195A1
Authority
EP
European Patent Office
Prior art keywords
layer
conductor
polymeric
tape
insulated
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP98901226A
Other languages
German (de)
English (en)
Inventor
Ashok K. Mehan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Raychem Corp
Original Assignee
Raychem Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Raychem Corp filed Critical Raychem Corp
Publication of EP0953195A1 publication Critical patent/EP0953195A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • H01B7/02—Disposition of insulation
    • H01B7/0241—Disposition of insulation comprising one or more helical wrapped layers of insulation
    • H01B7/025—Disposition of insulation comprising one or more helical wrapped layers of insulation comprising in addition one or more other layers of non-helical wrapped insulation

Definitions

  • This invention relates to insulated electrical conductors.
  • Polyimides e.g. polypyromellitimides and polyetherimides, are well known.
  • polyimides are thermosetting, and cannot be extruded. Therefore, when a polyimide is used to insulate an electrical conductor, it is usually used in the form of a tape which is wrapped around the conductor. Often the tape is coated on both sides with a fluoropolymer, so that the tape can be fused to itself after it has been wrapped (see for example U.S. Patent Nos. 3,616, 177, 4,628,003, 5,106,673, 5,238,748 and 4,399,434).
  • a disadvantage of polyimides is their poor resistance to arc tracking.
  • an insulated conductor having improved flex life can be produced by placing an intermediate layer of a melt-extruded polymeric adhesive, preferably a fluoroelastomer, between (i) an inner layer comprising a wrapped polymeric tape, particularly a polyimide tape, and (ii) an outer layer of an extruded polymeric composition, preferably a fluoropolymer.
  • a melt-extruded polymeric adhesive preferably a fluoroelastomer
  • an insulated conductor having improved flex life can be produced by placing an intermediate adhesive layer between an inner insulating layer of a first melt extruded polymer and an outer insulating layer of a second melt extruded polymer.
  • this invention provides an insulated electrical conductor which comprises:
  • (c) comprises a polymeric tape wrapped around the conductor
  • (b) is composed of a polymeric adhesive
  • (b) is composed of a polymeric composition
  • this invention provides a method of making such lated conductor by (A) wrapping the polymeric tape around the conductor;
  • this invention provides an insulated electrical conductor comprising:
  • an inner electrically insulating layer that surrounds and is in direct physical contact with the conductor, the inner layer being an uncrosslinked extruded polymeric layer;
  • the adhesive layer being adherent to both the inner layer and the outer layer.
  • the electrical conductor is generally a metal wire, which may be solid or stranded. Stranded wires are preferred, particularly when vibration is a factor, e.g. in airplanes.
  • the metal is generally copper, but may be a copper alloy or aluminum; copper is preferably plated with Sn, Ag or Ni to reduce oxidation and improve solderabilty. Stranded wires can be of the unilay, concentric stranding or other type.
  • Insulating tapes used in this invention comprise a continuous self-supporting tape of a suitable polymer, preferably a polyimide, e.g.. a polypyromellitimide.
  • a suitable polymer preferably a polyimide, e.g.. a polypyromellitimide.
  • Other polymers which can be used include fluoropolymers, e.g. ethylene/tetrafluoroethylene copolymers (ETFE), and polyesters, e.g. polyethylene terephthalate (PET), polybutylene terephthalate (PBT) and polyethylene naphthalate (PEN).
  • ETFE ethylene/tetrafluoroethylene copolymers
  • PET polyethylene terephthalate
  • PBT polybutylene terephthalate
  • PEN polyethylene naphthalate
  • the polymer is generally oriented.
  • the self-supporting tape is composed of a polyimide or other polymer which cannot be bonded to itself by heating, it is preferably coated on one or both sides with one or more layers of a suitable thermoplastic polymer or mixture of polymers, so that when the wrapped tape is heated, adjacent wraps of the tape bond to each other and preferably also to the conductor.
  • suitable thermoplastic polymers include fluoropolymers, e.g. polytetrafluoroethylene; tetrafluoroethylene copolymers, e.g..
  • ETFE tetrafluoroethylene-hexafluoropropylene copolymers (also known as fluorinated ethylene-propylene copolymers, FEP), tetrafiuoroethylene- perfluoroalkylvinylether homopolymer and copolymers, such as tetrafluoroethylene- perfluoromethylvinylether copolymer (MFA) and tetrafluoroethylene- perfluoropropylvinylether copolymer (PFA); polyvinylidene fluoride; vinylidene fluoride copolymers; polychlorotrifluoroethylene; and chlorotrifluoroethylene homopolymer and copolymers.
  • MFA tetrafluoroethylene- perfluoromethylvinylether copolymer
  • PFA tetrafluoroethylene- perfluoropropylvinylether copolymer
  • polyvinylidene fluoride vinylidene flu
  • suitable melt-extrudable polymers include fluoropolymers, e.g. ETFE, ethylene- chlorotrifluoroethylene copolymers (ECTFE), tetrafluoroethylene- perfluoroalkylvinylether copolymers, e.g. MFA and PFA; polyesters e.g. PET, PBT and PEN; polyethers, e.g. poly(ether ketones) and poly(ether ether ketones) (PEEK); and poly(ethersulfones).
  • fluoropolymers especially ETFE, ECTFE, MFA and PFA.
  • the layer is not crosslinked and contains no crosslinking agents.
  • the polymeric adhesive for the intermediate layer should be chosen by reference to the inner and outer layers.
  • the adhesive layer is adherent to both the inner layer and the outer layer, but it need not bond strongly to either layer; even a relatively slight tack between layers helps to enhance the flex life of the insulated conductor.
  • the polymeric adhesive is preferably elastomeric, i.e. it will readily recover its original shape after reasonable deformation.
  • the 1% secant modulus [as measured by the method described in Standard D 882-88 of the American Society of Testing Materials (ASTM)] of the material of the adhesive layer is desirably lower than the 1% secant modulus of the material of each of the inner and outer layers, preferably less than 50%, particularly less than 33%, of the 1% secant modulus of the material of each layer.
  • ASTM American Society of Testing Materials
  • the polymeric adhesive is preferably also a fluoropolymer, especially a fluoroelastomer, e.g. one of the THV polymers containing units derived from tetrafluoroethylene, hexafluoropropylene and vinylidene fluoride and available from 3M Co., one of the Viton fluoroelastomers available from du Pont Co.
  • a fluoropolymer especially a fluoroelastomer, e.g. one of the THV polymers containing units derived from tetrafluoroethylene, hexafluoropropylene and vinylidene fluoride and available from 3M Co., one of the Viton fluoroelastomers available from du Pont Co.
  • the adhesive is preferably a lower melting copolyester or an acrylic resin.
  • the outer insulating layer is composed of a melt-extruded polymer, preferably a fluoropolymer, e.g.. ETFE, CTFE. MFA, or PFA, or a polyester, e.g.. PET, PBT or PEN.
  • a fluoropolymer e.g.. ETFE, CTFE. MFA, or PFA
  • a polyester e.g.. PET, PBT or PEN.
  • the outer layer When the inner layer comprises a wrapped tape, the outer layer generally is not crosslinked (and does not, therefore, contain a crosslinking agent). However, it can be crosslinked; irradiation crosslinking should be avoided if it would degrade one of the polymers e.g.. a PTFE coating on the tape.
  • the outer layer is not crosslinked (and does not, therefore, contain a crosslinking agent).
  • the inner and outer layers will generally not be composed of the same materials, because a single layer of that material of the same total thickness would be expected to be of a comparable performance and easier to make.
  • the three layer insulation of this invention may retain the desirable notch propagation characteristics of a dual layer insulation while also obtaining improved flex life characteristics.
  • a weakly bonded, low strength adhesive layer can be chosen so that a notch made in the outer layer does not propagate through the adhesive layer upon sharp bending of the insulated conductor at the notch.
  • the material of the insulating layers have been described above by reference to their primary polymeric constituents. However, they may also contain other conventional constituents, e.g.. antioxidants, UV stabilizers, pigments or other coloring or opacifying agents (e.g.. titanium dioxide) and flame retardants.
  • antioxidants e.g., UV stabilizers, pigments or other coloring or opacifying agents (e.g.. titanium dioxide) and flame retardants.
  • the tape can be applied by standard techniques, e.g. as described in the U.S. Patents referred to above.
  • the overlap is preferably about 50% (i.e. so that there are two thickness of tape on the conductor).
  • an overlap of 45 to 50% e.g. 46 to 49%, may be preferred.
  • the tape-wrapped conductor is heated by conventional methods to cause such bonding, preferably before the additional layers of insulation are applied.
  • the melt-extruded layers of insulation are applied by standard techniques.
  • the intermediate and outer layers are preferably applied in a single coextrusion step, but this may not be possible if their melting points differ by more than 50°C.
  • FIG. 1 is a cross-section through an insulated electrical conductor of this invention
  • FIG. 2 is a perspective view of a insulated electric conductor according to the first preferred aspect of the invention, with partial removal of the layers
  • FIG. 3 is a perspective view of an insulated conductor according to the third preferred aspect of the invention, with partial removal of the layers.
  • an insulated conductor comprises a stranded metal wire conductor 10, an inner insulating layer 22, an intermediate adhesive insulating layer 24 and an outer insulating layer 26.
  • Each of the strands of the conductor comprises a copper core 12 and an electroplated tin coating 14.
  • the inner layer is a tape wrap 2A.
  • the inner layer is a melt- extruded layer 22B. Examples
  • the invention is illustrated by the following Examples, some of which are comparative examples.
  • the conductor used in the Examples was a stranded conductor, containing 19 strands of 200 ⁇ m diameter (32 AWG) tin-plated copper with unilay stranding, having a nominal outside diameter of 950 ⁇ m (37.5 mils) and an equivalent conductor diameter of 813 ⁇ m (20 AWG).
  • the insulated conductors produced in the Examples were tested by the method of Boeing Specification Support Standard 7324 (1992) Section 7.24. In this test, a length of wire loaded with a 900 g (2 lb) weight is repeatedly bent through a 180° total arc ( ⁇ 90°) between an opposed pair of 12.7 mm (0.5 inch) diameter mandrels spaced 1.8 mm (.07 inch) apart at 18 cycles/minute until the conductor breaks.
  • the insulated conductors were also tested by a method which was the same except that the load was 450 g (1 lb). The number of bending cycles (one cycle is +90° ⁇ -90° ⁇ +90°) to break the conductor is recorded.
  • Nine samples were tested in each Example. The Table below shows the average of the results obtained.
  • the bare conductor, tested at the 900 g. load broke after 380 cycles (average of three samples).
  • the conductor was wrapped, at an overlap of 46-49%, with a polyimide tape 19 ⁇ m (0.75 mil) thick and 5.5 mm (0.218 inch) wide, and having a coating of a fluoropolymer 13 ⁇ m (0.5 mil) thick on each surface thereof.
  • This tape is available under the tradename Chemfilm DF2909 from Chemfab Corporation, Merimak, New Hampshire.
  • the wrapped conductor was fed at 8.5 m/minute through a 90 cm long horizontal furnace, using a Lindberg type radiant heater set at 800° C, to bond the wraps of the tape layer to each other and to the conductor; and was then quenched by passage through a cold water quench placed 40 mm from the heater exit.
  • the nominal outside diameter of the wrapped conductor was 1100 ⁇ m (43.5 mil).
  • the adhesive layer and the outer layer were tube extruded over the wrapped conductor, using a coextrusion apparatus.
  • the wrapped conductor was preheated with a Lindberg type heater so that the outer surface temperature of the inner layer as it entered the extruder was about 260°C.
  • the adhesive was an elastomeric copolymer of tetrafluoroethylene, hexafluoropropylene, and vinylidene fluoride (available under the tradename THV-500G from 3M Inc.), and was extruded at about 280°C to a nominal thickness of 13 ⁇ m (0.5 mil.).
  • the outer layer was ETFE (available under the tradename Tefzel-280 from du Pont) to which had been added 4% by weight of a white color concentrate of ETFE and titanium dioxide (available under the tradename Tefzel 210 from ICI), and was extruded at about 310°C to a nominal thickness of 87 ⁇ m (3.5 mil), so that the nominal outer diameter of the insulated electrical conductor was 1300 ⁇ m (51.5 mil).
  • ETFE available under the tradename Tefzel-280 from du Pont
  • Tefzel 210 available under the tradename Tefzel 210 from ICI
  • Example 1 The procedure of Example 1 was followed except that no adhesive layer was used and the outer layer was extruded to a nominal thickness of 100 ⁇ m (4 mil) to give an insulated electrical conductor of the same outer diameter.
  • Example 3 The conductor was extrusion coated with ETFE (Tefzel 280) at about 330°C to a nominal thickness of 75 ⁇ m (3 mil). The adhesive layer and the outer layer were then tube extruded over the extrusion-coated conductor, using a coextrusion apparatus. The ETFE-coated conductor was preheated so that the outer surface temperature of the ETFE as it entered the extruder was about 200°C. The adhesive was the same fluoroelastomer as in Examples 1 and 2, and was extruded at about 280°C to a nominal thickness of 25 ⁇ m (1 mil).
  • ETFE Tefzel 280
  • the outer layer was ETFE (Tefzel 280) and was extruded at about 310 ° C to a nominal thickness of 75 ⁇ m (3 mils), so that the nominal outer diameter of the insulated electrical conductor was 1300 ⁇ m (51.5 mil).
  • Example 3 The procedure of Example 3 was followed except that (a) no adhesive layer was used, (b) the nominal thickness of the inner layer was 88 ⁇ m(3.5 mils), and (c) the nominal thickness of the outer layer was 88 ⁇ m(3.5 mil), so that the insulated electrical conductor was 1300 ⁇ m (51.5 mil).

Landscapes

  • Insulated Conductors (AREA)
  • Laminated Bodies (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Insulating Bodies (AREA)

Abstract

La présente invention concerne des conducteurs électriques isolés à durée de service en flexion améliorée comportant un conducteur électrique de forme allongée et une isolation électrique entourant ledit conducteur. L'isolation comprend trois couches: une couche interne constituée d'une bande polymère enveloppée ou une ocuche polymère extrudée; une couche intermédiaire constituée d'une couche polymère adhésive; et une couche externe constituée d'une couche polymère extrudée. La couche adhésive adhère à la fois à la couche interne et à la couche externe.
EP98901226A 1997-01-14 1998-01-09 Conducteurs electriques isoles Withdrawn EP0953195A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US783641 1991-10-28
US78364197A 1997-01-14 1997-01-14
PCT/US1998/000536 WO1998031022A1 (fr) 1997-01-14 1998-01-09 Conducteurs electriques isoles

Publications (1)

Publication Number Publication Date
EP0953195A1 true EP0953195A1 (fr) 1999-11-03

Family

ID=25129950

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98901226A Withdrawn EP0953195A1 (fr) 1997-01-14 1998-01-09 Conducteurs electriques isoles

Country Status (5)

Country Link
EP (1) EP0953195A1 (fr)
JP (1) JP2001508588A (fr)
AU (1) AU5735298A (fr)
TW (1) TW373191B (fr)
WO (1) WO1998031022A1 (fr)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6924436B2 (en) * 2002-03-21 2005-08-02 Schlumberger Technology Corporation Partial discharge resistant electrical cable and method
JP3870880B2 (ja) * 2002-09-04 2007-01-24 住友電装株式会社 導線と圧接端子との接続構造
JP2009093978A (ja) * 2007-10-11 2009-04-30 Mitsubishi Electric Corp コイル導線、誘導加熱用コイルおよび誘導加熱調理器
JP2011048929A (ja) 2009-08-25 2011-03-10 Yazaki Corp 端子付き電線
US9496070B2 (en) 2013-01-09 2016-11-15 Tyco Electronics Corporation Multi-layer insulated conductor having improved scrape abrasion resistance
CN105307861B (zh) 2013-05-31 2018-02-09 株式会社钟化 绝缘包覆材料及其利用
US10199138B2 (en) 2014-02-05 2019-02-05 Essex Group, Inc. Insulated winding wire
WO2015130681A1 (fr) * 2014-02-25 2015-09-03 Essex Group, Inc. Fil de bobinage isolé
WO2016084661A1 (fr) 2014-11-27 2016-06-02 株式会社カネカ Matériau de revêtement isolant possédant une excellente résistance à l'usure
CN107004473B (zh) 2014-11-27 2019-09-13 株式会社钟化 耐磨损性优越的绝缘包覆材
WO2016121000A1 (fr) 2015-01-27 2016-08-04 日立金属株式会社 Câble coaxial et câble médical
US10079080B2 (en) * 2016-06-20 2018-09-18 Marmon Aerospace & Defense LLC Coated wire
JP6508406B1 (ja) * 2017-11-21 2019-05-08 三菱マテリアル株式会社 絶縁導体および絶縁導体の製造方法
JP2019096606A (ja) 2017-11-21 2019-06-20 三菱マテリアル株式会社 絶縁導体および絶縁導体の製造方法
JP6607297B2 (ja) * 2018-10-02 2019-11-20 日立金属株式会社 同軸ケーブル及び医療用ケーブル
EP3836165A1 (fr) * 2019-12-11 2021-06-16 HEW-KABEL GmbH Élément électriquement conducteur isolé et son procédé de fabrication

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1579035A (fr) * 1968-06-18 1969-08-22
FR2555799B1 (fr) * 1983-11-25 1987-04-17 Filotex Sa Cable electrique, notamment pour usage aerospatial, a caracteristiques electriques ameliorees

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9831022A1 *

Also Published As

Publication number Publication date
WO1998031022A1 (fr) 1998-07-16
AU5735298A (en) 1998-08-03
JP2001508588A (ja) 2001-06-26
TW373191B (en) 1999-11-01

Similar Documents

Publication Publication Date Title
US5731088A (en) Multilayer polyimide-fluoropolymer insulation having superior cut-through resistance
US7049522B2 (en) Lightweight composite electrical conductors and cables incorporating same
EP0953195A1 (fr) Conducteurs electriques isoles
EP1380036B1 (fr) Systeme d'isolation multicouche pour conducteurs electriques
EP2571688B1 (fr) Bande isolante à haute température et fil ou câble revêtu par celle-ci
US8530746B2 (en) Polyimides and fluoropolymer bonding layer with improved internal adhesive strength
US20100218975A1 (en) Multi-layer insulated conductor with crosslinked outer layer
RU2604234C2 (ru) Высокотемпературная изоляционная лента и провод или кабель в изготовленной из нее оболочке
GB2460686A (en) Polymer coated wire or cable
TW416065B (en) Multiple insulating layer high voltage wire insulation
JPH07214733A (ja) 層状膜構造体および絶縁ワイヤ
US3650827A (en) Fep cables
WO2006005426A1 (fr) Fil electrique et constructions de cables resistants au feu
US20100218974A1 (en) Multi-layer insulated conductor with crosslinked outer layer
EP0040034A1 (fr) Fils isolés et câbles électriques
JP3444941B2 (ja) 耐熱・耐放射線性ケーブルおよびこれを用いた高速増殖炉の炉内構造物検査装置
JP2019091562A (ja) ツイストペアケーブル
WO2022074900A1 (fr) Fil isolé fusible et bobine à auto-fusion
JPH02270210A (ja) 絶縁電線
JPH0626119U (ja) 絶縁電線および同軸ケーブル
JPH05159635A (ja) 含弗素エラストマー絶縁電線
JPS63264818A (ja) アルミニウム又はアルミニウム合金の複数の細いストランドからなる導線を含む可撓性電気ケーブルの製造方法
JPH05144328A (ja) 耐放射線性電線
JPH05282925A (ja) 耐火絶縁電線

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19990630

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB IE IT LI NL SE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20010801