EP0526556B1 - Materiau d'isolation electrique - Google Patents

Materiau d'isolation electrique Download PDF

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Publication number
EP0526556B1
EP0526556B1 EP91908818A EP91908818A EP0526556B1 EP 0526556 B1 EP0526556 B1 EP 0526556B1 EP 91908818 A EP91908818 A EP 91908818A EP 91908818 A EP91908818 A EP 91908818A EP 0526556 B1 EP0526556 B1 EP 0526556B1
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EP
European Patent Office
Prior art keywords
porous
tape
wire
layer
ptfe
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.)
Expired - Lifetime
Application number
EP91908818A
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German (de)
English (en)
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EP0526556A1 (fr
Inventor
Andrea Gellan
William Patrick Mortimer, Jr.
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 EP0526556A1 publication Critical patent/EP0526556A1/fr
Application granted granted Critical
Publication of EP0526556B1 publication Critical patent/EP0526556B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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 which is extruded and calendered to form a tape and particularly though not exclusively, used for insulating wire.
  • the invention also includes a process for preparing the composite tape material, and to an insulated conductor.
  • PTFE polytetrafluoroethylene
  • TFE tetrafluoroethylene
  • PPVE perfluoro (propyl vinyl ether)
  • US 4 128 693 relates to a wire coated with a fluorocarbon composite material.
  • the material is extruded directly onto the wire and not calendered into a tape.
  • US 4 454 249 relates to a reinforced plastic which is moulded from a resin matrix such as stretched PTFE.
  • the material is intended to be used as a moulding composition and is not extruded or calendered into a tape.
  • EP 0 138 524 describes a specialised composition which includes irradiated PTFE.
  • the composition is melt extruded to provide an insulating layer on a conductor.
  • EP 0 010 152 discloses the use of mixes of PTFE and copolymer. The mixture is not extruded or calendered into a tape.
  • US 348 503 relates to blends of fluorinated polymers.
  • the document is directed to blends containing 50 to 90 weight percent of a copolymer of tetrafluoroethylene and perfluoro(alkyly vinyl ether).
  • GB 2 262 101 relates to a composite sheet material composed of a porous membrane of expanded polytetrafluoroethylene (PTFE) and a thermoplastic copolymer of tetrafluoroethylene and perfluoro(propylvinylether).
  • the composite that comprises 5 to 95 wt% of copolymer, at least a portion of which is entrapped within the pores of the porous membrane.
  • an electrically insulating composite material comprising in the form of a tape and comprising an intimate admixture of 5 to 40 wt.% of a thermoplastic copolymer of tetrafluoroethylene and perfluoro(propylvinylether) and 60 to 95 wt.% of coagulated dispersion type polytetrafluoroethylene (PTFE) ; the composite material having been extruded and calendered to form the tape.
  • PTFE coagulated dispersion type polytetrafluoroethylene
  • the tape of the present invention is non-porous.
  • the electrically insulating composite material comprises 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/cm 3 .
  • thermoplastic copolymer of tetrafluoroethylene and perfluoro(propylvinylether) 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 composite material may be used for producing a covering for wire, or other electrically conductive substrate; for example, one to which bonding is not normally required.
  • an insulated electrical conductor which comprises a wire having an electrically insulating layer formed of the composite material of the present invention around the wire.
  • the composite material 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. 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.
  • an insulated electrical conductor which comprises a wire having wrapped around it at least two adjacent layers, one layer being formed of the non-porous composite material of the present invention, and the second layer being formed of porous composite sheet material; the porous material being formed of a porous membrane of expanded polytetrafluoroethylene (PTFE) and a thermoplastic copolymer of tetrafluoroethylene and perfluoro(propylvinylether), wherein at least a portion of the thermoplastic copolymer is entrapped within the pores of the porous polytetrafluoroethylene.
  • PTFE expanded polytetrafluoroethylene
  • thermoplastic copolymer of tetrafluoroethylene and perfluoro(propylvinylether
  • 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.
  • the second layer of porous composite sheet material may be prepared by mixing a thermoplastic copolymer of tetrafluoroethylene and perfluoro(propylvinylether) 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 from the pellets and stretching the tape until a desired degree of porosity is attained.
  • the composite sheet material is prepared from a flocculated mixture of the TFE/PPVE copolymer and PTFE, in particulate form.
  • the mixture is lubricated for paste extrusion with an ordinary lubricant known for use in paste extrusion, and 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 sheet material is useful as an insulation covering for wire and cable, particularly in electrical applications. It is believed that the presence of the TFE/PPVE copolymer aids in adhering the layers of tape wrap to one another.
  • the composite sheet material can be sintered either before or after wrapping if desired to improve cohesiveness and strength of the material per se. Once the composite sheet material has been 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.
  • the porous composite sheet material has good cut-through resistance, strength and abrasion resistance.
  • porous composite sheet materials suitable for use in conjunction with the present invention are disclosed in the present application, and in our British patent application GB2,262,101.
  • the non-porous composite tape material of the present invention has good electrical (particularly dielectric) properties; whilst the porous composite sheet 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 of the present invention 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 tape material with conventional expanded PTFE may be used.
  • 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.
  • the solid material is mechanically worked, by calendering, to modify its shape or thickness prior to application to the substrate.
  • a method of insulating an electrical conductor which comprises wrapping two adjacent layers of tape of composite material around a wire, one layer being formed of non-porous composite material of the present invention and the second layer being formed of porous composite sheet material; the porous material being formed of a porous membrane of expanded polytetrafluoroethylene (PTFE) and a thermoplastic copolymer of tetrafluoroethylene and per fluoro(propylvinylether), wherein at least a portion of the thermoplastic copolymer is entrapped within the pores of the porous polytetrafluoroethylene and sintering the material to fuse the layers into a unitary structure.
  • PTFE expanded polytetrafluoroethylene
  • thermoplastic copolymer of tetrafluoroethylene and per fluoro(propylvinylether
  • Examples 1, 2, 6, 7, 8 and 9 relate to composite sheet materials which are claimed in our UK patent GB 2,262,101.
  • the Examples have been included in the present specification for illustrative purposes as the processes described therein may be applied to embodiments of the present invention.
  • Figure 1 shows a wire construction
  • 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 inch (100 microns) 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 inch (200 microns) and sintered in air at 400°C for 0.5 minute.
  • the powder/lubricant mixture was then compressed into a 4 inch pellet. Tape of thickness 0.003 inch (75 microns) was made from the resultant pellet by a similar method to that described in Example 1.
  • 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 (32m/min).
  • the tape was expanded longitudinally at a rate of 20:1 at 290°C at an output rate of 3.8 feet per minute (1.16m/min).
  • the tape was expanded longitudinally at a ratio of 2:1 at 325°C at an output of 75 feet per minute (23m/min).
  • 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.lmm 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)..
  • Tape made by the method given in Example 2 was slit and a 150 microns thick (post-sinter thickness) layer (B) was then counter-wrapped on the above insulated wire.
  • the resultant composite wire was then fused by heat treatment in air at 350°C for 20 minutes.
  • Figures of 113 - 151 cycles to failure (8 Newton load), and 110 - 130 Newtons were obtained when tested respectively, at room temperature, for scrape abrasion and dynamic cut-through resistance, according to Test Methods 30 and 26 given in BS G 230.

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  • 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)
  • Insulating Bodies (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Claims (12)

  1. Matériau composite d'isolation électrique sous forme d'un ruban, comprenant un mélange intime de 5 à 40% en poids d'un copolymère thermoplastique de tétrafluoroéthylène et de perfluoro(propylvinyléther) et de 60 à 95% en poids de polytétrafluoroéthylène (PFTE) de type dispersion coagulée; le matériau composite ayant été extrudé et calandré pour former le ruban.
  2. Matériau selon la revendication 1, qui comprend 8 à 20% en poids de copolymère et 80 à 92% en poids de PFTE.
  3. Matériau selon la revendication 1 ou 2, qui a une masse volumique de 2,0 à 2,2 g/cm3.
  4. Conducteur électrique isolé qui comprend un fil (C) portant une couche d'isolation électrique (A) formée d'un ruban selon la revendication 1 autour du fil.
  5. Conducteur selon la revendication 4, dans lequel le ruban a été fritté.
  6. Conducteur électrique isolé, qui comprend un fil (C) revêtu d'au moins deux couches adjacentes (A, B), une couche étant formée d'un matériau composite non poreux selon la revendication 1, et la seconde couche étant formée d'un matériau composite poreux en feuille; le matériau poreux étant formé d'une membrane poreuse de polytétrafluoroéthylène (PFTE) expansé et d'un copolymère thermoplastique de tétrafluoroéthylène et de perfluoro(propylvinyléther), dans lequel au moins une partie du copolymère thermoplastique est noyée à l'intérieur des pores du polytétrafluoroéthylène poreux.
  7. Conducteur isolé selon la revendication 6, dans lequel la couche non poreuse est adjacente au fil, et la couche poreuse recouvre la couche non poreuse.
  8. Conducteur isolé selon la revendication 6, dans lequel la couche poreuse est adjacente au fil, et la couche non poreuse recouvre la couche poreuse.
  9. Conducteur isolé selon la revendication 6, 7 ou 8, qui a été fritté pour faire fondre les couches du matériau composite.
  10. Procédé d'isolation d'un conducteur électrique comprenant l'extrusion sous forme d'une pâte un matériau d'isolation électrique formé à partir d'un mélange intime de 5 à 40% en poids d'un copolymère thermoplastique particulaire de tétrafluoroéthylène et de perfluoro(propylvinyléther) et de 60 à 95% en poids de polytétrafluoroéthylène (PFTE) de type dispersion coagulée; le calandrage du matériau et la formation d'un ruban; l'application dudit ruban autour d'un substrat conduisant l'électricité; et le frittage du matériau avant ou après l'application sur le substrat.
  11. Procédé selon la revendication 10, dans lequel le matériau est fritté à une température de 350 à 450°C pendant une durée de 0,5 à 20 min.
  12. Procédé d'isolation d'un conducteur électrique, qui comprend le revêtement d'un film avec deux couches adjacentes de ruban de matériau composite, une couche étant formée d'un matériau composite non poreux selon la revendication 1, et la seconde couche étant formée d'un matériau composite poreux en feuille; le matériau poreux étant formé d'une membrane poreuse de polytétrafluoroéthylène (PFTE) expansé et d'un copolymère thermoplastique de tétrafluoroéthylène et de perfluoro(propylvinyléther), dans lequel au moins une partie du copolymère thermoplastique est noyée à l'intérieur des pores du polytétrafluoroéthylène poreux, et le frittage du matériau pour faire fondre les couches en une structure unitaire.
EP91908818A 1990-04-27 1991-04-26 Materiau d'isolation electrique Expired - Lifetime EP0526556B1 (fr)

Applications Claiming Priority (5)

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 1990-04-27
PCT/GB1991/000661 WO1991017551A1 (fr) 1990-04-27 1991-04-26 Materiau d'isolation electrique

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP19920202891 Division EP0521588A3 (en) 1990-04-27 1991-04-26 Electrical insulating material
EP92202891.5 Division-Into 1992-09-22

Publications (2)

Publication Number Publication Date
EP0526556A1 EP0526556A1 (fr) 1993-02-10
EP0526556B1 true EP0526556B1 (fr) 1998-08-26

Family

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Family Applications (2)

Application Number Title Priority Date Filing Date
EP91908818A Expired - Lifetime EP0526556B1 (fr) 1990-04-27 1991-04-26 Materiau d'isolation electrique
EP19920202891 Withdrawn EP0521588A3 (en) 1990-04-27 1991-04-26 Electrical insulating material

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP19920202891 Withdrawn EP0521588A3 (en) 1990-04-27 1991-04-26 Electrical insulating material

Country Status (6)

Country Link
EP (2) EP0526556B1 (fr)
JP (1) JP3263071B2 (fr)
DE (1) DE69130062T2 (fr)
ES (1) ES2122972T3 (fr)
GB (1) GB2261668B (fr)
WO (1) WO1991017551A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11535017B2 (en) 2017-04-04 2022-12-27 W. L. Gore & Associates Gmbh Dielectric composite with reinforced elastomer and integrate electrode

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US5560986A (en) * 1990-04-27 1996-10-01 W. L. Gore & Associates, Inc. Porous polytetrafluoroethylene sheet composition
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
EP0777567B1 (fr) * 1994-09-02 2001-08-22 W.L. Gore & Associates, Inc. Compositions de polytetrafluoroethylene poreuses
GB9606818D0 (en) * 1996-03-30 1996-06-05 Gore W L & Ass Uk Granular-type modified polytetrafluoroethlyene dispersions and fused articles prepared therefrom (Case A)
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
US20030211264A1 (en) * 2002-05-09 2003-11-13 Farnsworth Ted Ray Expanded polytetrafluoroethylene (ePTFE)-reinforced perfluoroelastomers (FFKM)
CN100447194C (zh) * 2003-08-25 2008-12-31 大金工业株式会社 成型体及其制造方法、高频信号传输用产品以及高频传输电缆
WO2015067326A1 (fr) 2013-11-08 2015-05-14 Saint-Gobain Performance Plastics Corporation Articles contenant du ptfe possédant une stabilité dimensionnelle améliorée, particulièrement sur de grandes longueurs, procédés de fabrication desdits articles et ensembles câbles/fils contenant lesdits articles
KR102212356B1 (ko) * 2016-01-28 2021-02-03 로저스코포레이션 플루오로폴리머 복합 필름 래핑된 와이어들 및 케이블들
WO2018229569A1 (fr) * 2017-06-15 2018-12-20 Corning Research & Development Corporation Système de câblage de distribution
JP2020064801A (ja) * 2018-10-18 2020-04-23 本田技研工業株式会社 ステータ

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US3484503A (en) * 1967-06-19 1969-12-16 Du Pont Blends of fluorinated polymers
SE392582B (sv) * 1970-05-21 1977-04-04 Gore & Ass Forfarande vid framstellning av ett porost material, genom expandering och streckning av en tetrafluoretenpolymer framstelld i ett pastabildande strengsprutningsforfarande
AU1789076A (en) * 1975-09-09 1978-03-23 Itt Plastics composition
DE2840356A1 (de) * 1978-09-16 1980-04-03 Hoechst Ag Waessrige dispersion von fluorpolymeren mit verbesserten beschichtungseigenschaften
JPS6030711B2 (ja) * 1981-08-28 1985-07-18 株式会社 潤工社 強化弗素樹脂
JPS601891B2 (ja) * 1981-08-28 1985-01-18 株式会社 潤工社 発泡プラスチックの製造方法
CA1262392A (fr) * 1983-10-07 1989-10-17 Raychem Corporation Compositions de fluoropolymere a faconner en phase liquide
JPS62260849A (ja) * 1986-04-11 1987-11-13 Daikin Ind Ltd 熱溶融性フツ素樹脂の顆粒状粉末およびその製造法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11535017B2 (en) 2017-04-04 2022-12-27 W. L. Gore & Associates Gmbh Dielectric composite with reinforced elastomer and integrate electrode

Also Published As

Publication number Publication date
ES2122972T3 (es) 1999-01-01
EP0526556A1 (fr) 1993-02-10
DE69130062D1 (de) 1998-10-01
JP3263071B2 (ja) 2002-03-04
DE69130062T2 (de) 1999-04-08
GB9219772D0 (en) 1992-11-11
GB2261668B (en) 1995-01-11
EP0521588A3 (en) 1993-09-08
EP0521588A2 (fr) 1993-01-07
GB2261668A (en) 1993-05-26
WO1991017551A1 (fr) 1991-11-14
JPH05509433A (ja) 1993-12-22

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