EP0521588A2 - Elektrisches Isolationsmaterial - Google Patents

Elektrisches Isolationsmaterial Download PDF

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Publication number
EP0521588A2
EP0521588A2 EP92202891A EP92202891A EP0521588A2 EP 0521588 A2 EP0521588 A2 EP 0521588A2 EP 92202891 A EP92202891 A EP 92202891A EP 92202891 A EP92202891 A EP 92202891A EP 0521588 A2 EP0521588 A2 EP 0521588A2
Authority
EP
European Patent Office
Prior art keywords
tape
porous
ptfe
wire
copolymer
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Withdrawn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
EP92202891A
Other languages
English (en)
French (fr)
Other versions
EP0521588A3 (en
Inventor
William Patrick Mortimer
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.)
WL Gore and Associates UK Ltd
WL Gore and Associates Inc
Original Assignee
WL Gore and Associates UK Ltd
WL Gore and Associates Inc
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
Priority claimed from GB909009407A external-priority patent/GB9009407D0/en
Application filed by WL Gore and Associates UK Ltd, WL Gore and Associates Inc filed Critical WL Gore and Associates UK Ltd
Publication of EP0521588A2 publication Critical patent/EP0521588A2/de
Publication of EP0521588A3 publication Critical patent/EP0521588A3/en
Withdrawn legal-status Critical Current

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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
    • H01B7/17—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
    • 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
    • H01B3/44—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 vinyl resins; acrylic resins
    • H01B3/443—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 vinyl resins; acrylic resins from vinylhalogenides or other halogenoethylenic compounds
    • H01B3/445—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 vinyl resins; acrylic resins from vinylhalogenides or other halogenoethylenic compounds from vinylfluorides or other fluoroethylenic compounds
    • 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

Definitions

  • the present invention relates to an electrical insulating composite material, particularly though not exclusively for insulating wire.
  • the invention also includes a method of forming the insulating material, and insulated conductors.
  • PTFE polytetrafluoroethylene
  • TFE tetrafluoroethylene
  • PPVE perfluoro (propyl vinyl ether)
  • the present invention provides an electrical insulating composite material which comprises an intimate admixture of:
  • the composite material itself may be non-porous or may be expanded to produce porous material.
  • the TFE/PPVE copolymer is preferably used in particulate form and preferably has a particle size in the range 1 to 180 microns, especially 20 to 100 microns.
  • the particles may have a wide range of particle sizes and preferably include particles having sizes right across the ranges. However, particles of narrow size range may also be used.
  • the TFE/PPVE copolymer particles preferably have a substantially regular shape, such as oblong or spherical.
  • the polytetrafluoroethylene component is of the coagulated dispersion type.
  • polytetrafluoroethylene PTFE
  • PTFE polytetrafluoroethylene
  • the PTFE resin can be used in powder form; or alternatively, the PTFE resin can be coagulated from an aqueous dispersion in the presence of perfluoroalkoxy TFE/PVE copolymer powder or dispersion. The coagulation of PTFE in the presence of a dispersion of the copolymer results in a co-coagulation of PTFE and copolymer.
  • the flocculated mixture may then be decanted and dried.
  • the electrically insulating material may be used for producing a covering for wire, or other electrically conductive substrate to which bonding is not normally required.
  • One particular aspect of the present invention provides a non-porous electrical insulating material for an electrical conductor comprising an intimate admixture of 5 to 40 weight percent of a thermoplastic copolymer of tetrafluoroethylene and perfluoro (propyl vinyl ether); and 60 to 95 weight percent of coagulated dispersion type polytetrafluoroethylene.
  • the composite material comprises 5 to 40 wt% of copolymer (and 60 to 95 wt% PTFE); more particularly 8 to 20 wt% of copolymer (and 80 to 92 wt% of PTFE).
  • the non-porous material typically has a density of 2.0 to 2.2 g/cc.
  • a method of insulating an electrical conductor comprising; paste extruding an electrically insulating material formed from an intimate mixture of 5 to 40 weight percent of a particulate thermoplastic copolymer of tetrafluoroethylene and perfluoro (propyl vinyl ether); and 60 to 95 weight percent of coagulated dispersion type polytetrafluoroethylene; applying said material to an electrically conductive substrate; and sintering the material before or after application to the substrate.
  • the paste extrusion step may be carried out using conventional PTFE extrusion techniques (for example in admixture with a liquid carrier, such as a hydrocarbon).
  • a liquid carrier such as a hydrocarbon
  • the extruded composition is generally of thin section so as to allow efficient removal of the liquid carrier and formation of a solid material, usually in the form of a sheet, tape or filament. If necessary, the solid material may be mechanically worked, such as by calendering, to modify its shape or thickness prior to application to the substrate.
  • the solid material in the form of a tape is wrapped around the wire in overlapping turns.
  • the overlapping areas of the material may then be fused together, for example at temperatures of 350 to 450°C (for 0.5 to 20 minutes).
  • the time will be in correspondence with the temperature employed. Temperatures as low as 320°C may be used at long sintering times. Lower temperatures tend to minimise degradation of the material.
  • the time and temperature conditions also depend on the construction of the insulated conductor, such as thickness of the insulation and number of cores in the wire.
  • wire electrical insulation made from wrapped and sintered tape produced from the composition has an unexpectedly better cut-through resistance and abrasion resistance than equivalent wire insulation made from fine powder PTFE alone.
  • a second particular aspect of the invention provides a porous material which is a composite of:
  • thermoplastic copolymer will constitute about 5-50 weight percent of the composite.
  • the composite is useful as insulation on wire or cable, especially as electrical insulation.
  • thermoplastic copolymer will constitute about 50-95 weight percent of the composite.
  • the composite is useful as a reinforced thermoplastic copolymer film.
  • This aspect of the invention also provides a process for preparing the composites which comprises mixing the thermoplastic copolymer with a dispersion of the coagulated fine powder polytetrafluoroethylene resin or with a dispersion of the fine powder and coagulating the solids to obtain a resin blend, preparing pellets of the resin blend, forming a tape of the pellets and stretching the tape until a desired degree of porosity is attained in the resulting composite.
  • a flocculated mixture of the TFE/PPVE copolymer and PTFE, in particulate form is lubricated for paste extrusion with an ordinary lubricant known for use in paste extrusion, and is pelletized.
  • the pellets are preferably aged at 40-60°C and are then paste extruded into a desired shape, usually a film.
  • the extruded shape is then stretched, preferably in a series of at least two stretch steps while heating at between 35-360°C until a desired degree of porosity is attained.
  • the porosity occurs through the formation of a network of interconnected nodes and fibrils in the structure of the stretched PTFE film, as more fully described in U.S. Patent 3,953,566.
  • the density of the porous material will usually be less than 2.0 g/cc.
  • the TFE/PPVE copolymer melts and, depending on the amount present, may become entrapped in the pores or nodes formed, may coat the nodes or fibrils, or may be present on the outer surface of the membrane formed. Most likely a combination of each embodiment occurs, depending on whether the copolymer and the PTFE remain as distinct moieties.
  • the porous composite is useful as an insulation covering for wire and cable, particularly in electrical applications.
  • the composite can simply be wrapped around the wire or cable in overlapping turns. It is believed that the presence of the TFE/PPVE copolymer aids in adhering the layers of tape wrap to one another.
  • the porous composite can be sintered either before or after wrapping if desired to improve cohesiveness and strength of the tape per se. Once the porous composite is prepared, it can be compressed, if desired, to increase the density of the composite. Such compression does not significantly affect the increased matrix strength that is associated with expanded porous PTFE. Compression improves properties such as dielectric strength and cut-through resistance.
  • wire and cable insulation made from the non-porous or porous composites of this invention have unexpectedly better cut-through resistance, strength and abrasion resistance than insulation made from the TFE/PPVE copolymer alone or from non-expanded PTFE.
  • a third particular aspect of the present invention provides an insulated electrical conductor, which comprises a wire having wrapped around it two adjacent layers of the composite material, one layer being formed of non-porous composite material and the second layer being formed of porous composite material.
  • the layers are applied in the form of tapes wrapped (preferably counter-wrapped) around the wire in overlapping turns.
  • the layers may also be applied longitudinally with a longitudinal overlapping seam.
  • sintering takes place after the two tapes have been applied; so that the layers become fused into an integral structure. Sintering may be brought about under the conditions previously described.
  • non-porous non-expanded material has good electrical (particularly dielectric) properties; whilst the porous expanded material (whether compressed after expansion or not) has good mechanical properties (particularly cut-through resistance). Surprisingly these properties are retained in the two-layer insulated electrical conductor notwithstanding sintering, so that an insulating layer having both good mechanical and electrical properties is obtained.
  • Either the porous or the non-porous layer may be adjacent the wire. Placing the non-porous layer adjacent the wire facilitates stripping of the wire when a connection is to be made. Placing the non-porous layer uppermost allows better overprinting (e.g. for colour coding).
  • more than two layers of material may be used, for example non-porous/porous/non-porous which provides good stripping and printing characteristics.
  • one or more porous or non-porous layers of the material of the present invention may be wrapped together with one or more layers of conventional expanded or non-expanded PTFE tape prior to sintering.
  • the combination of layers of non-porous composite material with conventional expanded PTFE; and the combination of layers porous composite material with non-expanded PTFE may be used.
  • Figure 1 shows a wire construction
  • the pellet was left for 24 hours at a temperature of 35 to 39°C before extrusion on a standard PTFE ram extruder at room temperature.
  • the extrudate of thickness 0.035 inch (890 microns) was then calendered down to 0.004 inch (101 microns) in three stages, using rollers heated to approximately 50°C.
  • the 0.004" tape was slit and wrapped on to 22 AWG (American Wire Gauge) 19 strand silver plated electrical wire conductor, to an insulation wall thickness of 0.008" (200 microns) and sintered in air at 400°C for 0.5 minute.
  • a similar wire sample was made using only the PTFE resin for comparison.
  • the powder/lubricant mixture was then compressed into a 4 inch pellet. Tape of thickness 0.003" (75 microns) was made from the resultant pellet by a similar method to that described in Example 1.
  • the solids, in particulate form, were lubricated with mineral spirits (19% by weight) and pelletized under vacuum.
  • the pellets were aged at 49°C for about 24 hours, and were then extruded into tape.
  • the tape was calendared to a thickness of 16.5 mil. and then dried to remove lubricant.
  • the dried tape was stretched in three steps.
  • the tape was expanded longitudinally 93% (1.93 to 1) at 270°C at an output rate of 105 feet per minute.
  • the tape was expanded longitudinally at a rate of 20:1 at 290°C at an output rate of 3.8 feet per minute.
  • the tape was expanded longitudinally at a ratio of 2:1 at 325°C at an output of 75 feet per minute.
  • the resulting porous tape was then subjected to heat at 330°C for about 6 seconds.
  • the bulk density was 2.0 gm/cc.
  • Example 3 The procedure of Example 3 was followed, except that in the first stretch step the stretch was at 1.9 to 1 instead of 1.93 to 1, and in the second stretch step the temperature was 300°C, and, in the third stretch step, the temperature was 360°C.
  • the tape was not compressed.
  • the resulting density was 0.7 gm/cc.
  • the insulated wire was then heat treated in air at 350°C for 15 minutes, to fuse the insulation material.
  • the resultant wire was tested for dynanmic cut-through resistance according to the test method given in BS G 230.
  • the expanded tape made by the method given in Example 3 was slit and a 0.15mm thick layer (0.1mm post-sinter) was wrapped (layer A) on to 20 AWG (American Wire Gauge) 19 strand nickel plated copper conductor (C).
  • Tape made by the method given in Example 2 was slit and then a 0.20mm thick layer (0.15mm post-sinter) was counter-wrapped (layer B) on the above insulated wire (See Figure 1). Counter-wrapping means that the tapes were wound as spirals of opposite hand.
  • Example 3 The resultant composite wire was then sintered in air at 400°C for 1.5 minutes.
  • the insulation had a final post-sinter thickness of 0.25mm.
  • Similar insulated wires were made with only the tape manufactured as in Example 3 or Example 4.
  • the overall diameter of all samples was maintained at 1.5mm, resulting in similar wall thicknesses to allow the samples to be compared with one another.
  • Expanded tape made by the method given in Example 3 was slit and a 50 microns thick (post-sinter thickness) layer (A) was wrapped onto 20AWG (American Wire Gauge) 19 strand nickel plated copper conductor (C)..
  • the resultant composite wire was then fused by heat treatment in air at 350°C for 20 minutes.
  • Tape made by the method given in Example 2 was slit and a 150 microns thick (post-sinter thickness) layer (A) was wrapped onto 20AWG (American Wire Gauge) 19 strand nickel plated copper conductor (C).
  • Expanded tape made by the method given in Example 3 was slit and a 50 microns thick (post-sinter thickness) layer (8) was counter-wrapped on the above insulated wire.
  • the resultant composite wire was then fused by heat-treatment in air for 1.5 minutes at 400°C followed by 20 minutes at 350°C.
  • Table 4 Test Test Method Result High Voltage BS G 230 5 KV Immersion Test Test 16a Dynamic Cut-Through BS G 230 139 N Test 26 (Room Temperature) Scrape Abrasion BS G 230 95 Cycles Test 30 (8N Load, Room Temperature)

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Organic Insulating Materials (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Laminated Bodies (AREA)
  • Operation Control Of Excavators (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Insulating Bodies (AREA)
EP19920202891 1990-04-27 1991-04-26 Electrical insulating material Withdrawn EP0521588A3 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US51530290A 1990-04-27 1990-04-27
GB9009407 1990-04-27
GB909009407A GB9009407D0 (en) 1990-04-27 1990-04-27 Electrical insulating material
US515302 1995-08-15

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP91908818A Division EP0526556B1 (de) 1990-04-27 1991-04-26 Elektrisches isolationsmaterial
EP91908818.7 Division 1991-04-26

Publications (2)

Publication Number Publication Date
EP0521588A2 true EP0521588A2 (de) 1993-01-07
EP0521588A3 EP0521588A3 (en) 1993-09-08

Family

ID=26296995

Family Applications (2)

Application Number Title Priority Date Filing Date
EP19920202891 Withdrawn EP0521588A3 (en) 1990-04-27 1991-04-26 Electrical insulating material
EP91908818A Expired - Lifetime EP0526556B1 (de) 1990-04-27 1991-04-26 Elektrisches isolationsmaterial

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP91908818A Expired - Lifetime EP0526556B1 (de) 1990-04-27 1991-04-26 Elektrisches isolationsmaterial

Country Status (6)

Country Link
EP (2) EP0521588A3 (de)
JP (1) JP3263071B2 (de)
DE (1) DE69130062T2 (de)
ES (1) ES2122972T3 (de)
GB (1) GB2261668B (de)
WO (1) WO1991017551A1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5560986A (en) * 1990-04-27 1996-10-01 W. L. Gore & Associates, Inc. Porous polytetrafluoroethylene sheet composition
WO1997036952A1 (en) * 1996-03-30 1997-10-09 W.L. Gore & Associates (Uk) Ltd. Granular-type polytetrafluoroethylene dispersions and fused articles prepared therefrom
WO2003095552A1 (en) * 2002-05-09 2003-11-20 Gore Enterprise Holdings, Inc. Eptfe-reinforced perfluoroelastomers
EP1661947A1 (de) * 2003-08-25 2006-05-31 Daikin Industries, Ltd. Formkörper, herstellungsverfahren dafür, produkt für hochfrequenzsignalübertragung und hochfrequenzsignalübertragungskabel
CN111081413A (zh) * 2018-10-18 2020-04-28 本田技研工业株式会社 电线及定子

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4041168A1 (de) * 1990-12-21 1992-07-02 Reinshagen Kabelwerk Gmbh Verfahren und vorrichtung zur herstellung einer mit fluorkarbon isolierten elektrischen leitung
GB9207330D0 (en) * 1992-04-03 1992-05-13 Gore W L & Ass Uk Flat cable
US5500038A (en) * 1994-08-30 1996-03-19 W. L. Gore & Associates, Inc. Non-particulating compact adsorbent filter
AU688404B2 (en) * 1994-09-02 1998-03-12 W.L. Gore & Associates, Inc. Porous polytetrafluoroethylene compositions
DE19638416C1 (de) * 1996-09-19 1997-11-13 Gore W L & Ass Gmbh Formkörper aus einem Blend eines Fluorpolymeren und eines Thermoplasten und Verfahren zu dessen Herstellung
US6436533B1 (en) 2000-07-27 2002-08-20 E. I. Du Pont De Nemours And Company Melt spun fibers from blends of poly(tetrafluoroethylene) and poly(tetrafluoroethylene-co-perfluoro-alkylvinyl ether)
DE10201833B4 (de) * 2002-01-18 2012-06-21 Hew-Kabel Gmbh Verfahren zur Herstellung eines Wickelbandes aus ungesintertem Polytetrafluorethylen
EP3065929A1 (de) 2013-11-08 2016-09-14 Saint-gobain Performance Plastics Corporation Artikel mit ptfe mit verbesserter dimensionsstabilität insbesondere über lange längen, verfahren zur herstellung solcher artikel und kabel-/drahtanordnungen mit solchen artikeln
KR102212356B1 (ko) * 2016-01-28 2021-02-03 로저스코포레이션 플루오로폴리머 복합 필름 래핑된 와이어들 및 케이블들
CA3055013C (en) 2017-04-04 2021-08-03 W. L. Gore & Associates Gmbh Dielectric composite with reinforced elastomer and integrated electrode
CA3067297A1 (en) 2017-06-15 2018-12-20 Corning Research & Development Corporation Distribution cabling system

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3484503A (en) * 1967-06-19 1969-12-16 Du Pont Blends of fluorinated polymers
US3953566A (en) * 1970-05-21 1976-04-27 W. L. Gore & Associates, Inc. Process for producing porous products
US4128693A (en) * 1975-09-09 1978-12-05 International Telephone And Telegraph Corporation Wire coated with fluorocarbon blend
EP0010152A1 (de) * 1978-09-16 1980-04-30 Hoechst Aktiengesellschaft Wässrige Dispersion von Fluorpolymeren mit verbesserten Beschichtungseigenschaften
US4379858A (en) * 1981-08-28 1983-04-12 Hirosuke Suzuki Foamed plastics
US4454249A (en) * 1981-08-28 1984-06-12 Junkosha Co., Ltd. Reinforced plastics with porous resin fragments
EP0138524A1 (de) * 1983-10-07 1985-04-24 RAYCHEM CORPORATION (a Delaware corporation) Aus der Schmelze formbare Fluoropolymerzusammensetzung
DE3712308A1 (de) * 1986-04-11 1987-10-22 Daikin Ind Ltd Koerniges pulver aus einem in der schmelze verarbeitbaren, fluor enthaltenden harz und verfahren zu seiner herstellung

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3484503A (en) * 1967-06-19 1969-12-16 Du Pont Blends of fluorinated polymers
US3953566A (en) * 1970-05-21 1976-04-27 W. L. Gore & Associates, Inc. Process for producing porous products
US4128693A (en) * 1975-09-09 1978-12-05 International Telephone And Telegraph Corporation Wire coated with fluorocarbon blend
EP0010152A1 (de) * 1978-09-16 1980-04-30 Hoechst Aktiengesellschaft Wässrige Dispersion von Fluorpolymeren mit verbesserten Beschichtungseigenschaften
US4379858A (en) * 1981-08-28 1983-04-12 Hirosuke Suzuki Foamed plastics
US4454249A (en) * 1981-08-28 1984-06-12 Junkosha Co., Ltd. Reinforced plastics with porous resin fragments
EP0138524A1 (de) * 1983-10-07 1985-04-24 RAYCHEM CORPORATION (a Delaware corporation) Aus der Schmelze formbare Fluoropolymerzusammensetzung
DE3712308A1 (de) * 1986-04-11 1987-10-22 Daikin Ind Ltd Koerniges pulver aus einem in der schmelze verarbeitbaren, fluor enthaltenden harz und verfahren zu seiner herstellung

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5560986A (en) * 1990-04-27 1996-10-01 W. L. Gore & Associates, Inc. Porous polytetrafluoroethylene sheet composition
WO1997036952A1 (en) * 1996-03-30 1997-10-09 W.L. Gore & Associates (Uk) Ltd. Granular-type polytetrafluoroethylene dispersions and fused articles prepared therefrom
GB2319029A (en) * 1996-03-30 1998-05-13 Gore & Ass Granular-type polytetrafluoroethylene dispersions and fused articles prepared therefrom
GB2319029B (en) * 1996-03-30 2000-02-23 Gore & Ass Granular-type polytetrafluoroethylene dispersions and fused articles prepared therefrom
WO2003095552A1 (en) * 2002-05-09 2003-11-20 Gore Enterprise Holdings, Inc. Eptfe-reinforced perfluoroelastomers
EP1661947A1 (de) * 2003-08-25 2006-05-31 Daikin Industries, Ltd. Formkörper, herstellungsverfahren dafür, produkt für hochfrequenzsignalübertragung und hochfrequenzsignalübertragungskabel
EP1661947A4 (de) * 2003-08-25 2009-03-04 Daikin Ind Ltd Formkörper, herstellungsverfahren dafür, produkt für hochfrequenzsignalübertragung und hochfrequenzsignalübertragungskabel
US7732531B2 (en) 2003-08-25 2010-06-08 Daikin Industries, Ltd. Molded object process for producing the same product for high-frequency signal transmission and high-frequency transmission cable
CN111081413A (zh) * 2018-10-18 2020-04-28 本田技研工业株式会社 电线及定子

Also Published As

Publication number Publication date
GB2261668A (en) 1993-05-26
WO1991017551A1 (en) 1991-11-14
EP0521588A3 (en) 1993-09-08
EP0526556B1 (de) 1998-08-26
JPH05509433A (ja) 1993-12-22
DE69130062T2 (de) 1999-04-08
ES2122972T3 (es) 1999-01-01
GB2261668B (en) 1995-01-11
DE69130062D1 (de) 1998-10-01
JP3263071B2 (ja) 2002-03-04
EP0526556A1 (de) 1993-02-10
GB9219772D0 (en) 1992-11-11

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