GB1384016A - Polytetrafluoroethylene fibres and filaments having reduced electrical resistance - Google Patents

Polytetrafluoroethylene fibres and filaments having reduced electrical resistance

Info

Publication number
GB1384016A
GB1384016A GB2633072A GB2633072A GB1384016A GB 1384016 A GB1384016 A GB 1384016A GB 2633072 A GB2633072 A GB 2633072A GB 2633072 A GB2633072 A GB 2633072A GB 1384016 A GB1384016 A GB 1384016A
Authority
GB
United Kingdom
Prior art keywords
filament
ptfe
electrical resistance
carbon black
spinning
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
Application number
GB2633072A
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.)
Hoechst AG
Original Assignee
Hoechst AG
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 Hoechst AG filed Critical Hoechst AG
Publication of GB1384016A publication Critical patent/GB1384016A/en
Expired 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
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/002—Inhomogeneous material in general
    • H01B3/004—Inhomogeneous material in general with conductive additives or conductive layers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/04—Carbon
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/20—Conductive material dispersed in non-conductive organic material
    • H01B1/22—Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/20—Conductive material dispersed in non-conductive organic material
    • H01B1/24—Conductive material dispersed in non-conductive organic material the conductive material comprising carbon-silicon compounds, carbon or silicon

Landscapes

  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Dispersion Chemistry (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Artificial Filaments (AREA)
  • Multicomponent Fibers (AREA)

Abstract

1384016 Polytetrafluoroethylene filaments HOECHST AG 6 June 1972 [18 June 1971] 26330/72 Heading B5B [Also in Division C3] A filament comprising polytetrafluoroethylene and particles of an electrically conductive material, especially an electrically conductive pigment, is made by spinning a solution containing these constituents, and preferably also cellulose or a cellulose derivative. The nature and the amount of the conductive material are chosen to give an electrical resistance in the range specified below. After spinning the filament may be heattreated to cause mechanical hardening or sintering of the filament. Specified conductive pigments include carbon black, graphite, and metals especially copper, iron and nickel. The grain size of the material, which may comprise at least 10% of the weight of the filament, preferably does not exceed 100 microns. Mixtures of pigments may be used, especially of carbon black and graphite. A dispersion containing a conductive pigment may be introduced into a spinning solution containing a PTFE dispersion, optionally in emulsified form. Also suitable are spinning solutions in which organic substances are used for thickening the PTFE dispersions, and spinning solutions spun in gelled form. Alternatively, conductive pigment may be mixed with PTFE powder, or the mixture suspended in gasoline, higher boiling mineral oil or in a plastifier substance, e.g. dimethyl phthalate and the paste so formed extruded through a nozzle. In the example, a viscose solution is mixed with a PTFE dispersion, a non-ionic dispersing agent, and carbon black to form a spinning solution containing total solids comprising 7% cellulose, 16% carbon black and 77% PTFE, which is spun into a coagulating bath containing sulphuric acid and sodium sulphate. The wound filament is drawn at 380‹ C. and rewound. Filaments so made show substantially uniform distribution of the electrically conductive material across their cross-section and have a maximum electrical resistance of either 1000#/ cm.dtex. or a thousandth of the electrical resistance of a corresponding PTFE filament which does not contain electrically conductive material, whichever is the lower. Thus the filament exemplified shows an electrical resistance of 10<SP>4</SP>#/cm. while a similar filament containing no carbon black shows a resistance of more than 10<SP>9</SP>#.
GB2633072A 1971-06-18 1972-06-06 Polytetrafluoroethylene fibres and filaments having reduced electrical resistance Expired GB1384016A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712130039 DE2130039A1 (en) 1971-06-18 1971-06-18 Fibers and threads made of polytetrafluoroethylene (PTFE) with reduced electrical resistance

Publications (1)

Publication Number Publication Date
GB1384016A true GB1384016A (en) 1974-02-12

Family

ID=5810997

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2633072A Expired GB1384016A (en) 1971-06-18 1972-06-06 Polytetrafluoroethylene fibres and filaments having reduced electrical resistance

Country Status (6)

Country Link
BE (1) BE785105A (en)
DE (1) DE2130039A1 (en)
FR (1) FR2142074A1 (en)
GB (1) GB1384016A (en)
IT (1) IT956665B (en)
NL (1) NL7208053A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4591700A (en) * 1980-05-19 1986-05-27 Raychem Corporation PTC compositions
WO1994002668A1 (en) * 1992-07-16 1994-02-03 W.L. Gore & Associates, Inc. Polytetrafluoroethylene fiber containing conductive filler
US6210607B1 (en) 1978-04-24 2001-04-03 Raychem Limited Electrically conductive materials

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6436135B1 (en) 1974-10-24 2002-08-20 David Goldfarb Prosthetic vascular graft
US4895620A (en) * 1986-02-18 1990-01-23 Armstrong World Industries, Inc. Electrically conductive carbon-coated fibers

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6210607B1 (en) 1978-04-24 2001-04-03 Raychem Limited Electrically conductive materials
US4591700A (en) * 1980-05-19 1986-05-27 Raychem Corporation PTC compositions
WO1994002668A1 (en) * 1992-07-16 1994-02-03 W.L. Gore & Associates, Inc. Polytetrafluoroethylene fiber containing conductive filler

Also Published As

Publication number Publication date
DE2130039A1 (en) 1972-12-28
IT956665B (en) 1973-10-10
FR2142074A1 (en) 1973-01-26
BE785105A (en) 1972-12-19
NL7208053A (en) 1972-12-20

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees