GB1449261A - Self-limitting conductive extrudates and methods for their manufacture - Google Patents

Self-limitting conductive extrudates and methods for their manufacture

Info

Publication number
GB1449261A
GB1449261A GB4213973A GB4213973A GB1449261A GB 1449261 A GB1449261 A GB 1449261A GB 4213973 A GB4213973 A GB 4213973A GB 4213973 A GB4213973 A GB 4213973A GB 1449261 A GB1449261 A GB 1449261A
Authority
GB
United Kingdom
Prior art keywords
polymer
extruded
annealing
copolymers
jacket
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
GB4213973A
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 GB1449261A publication Critical patent/GB1449261A/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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
    • H01C7/02—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having positive temperature coefficient
    • H01C7/027—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having positive temperature coefficient consisting of conducting or semi-conducting material dispersed in a non-conductive organic material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Ceramic Engineering (AREA)
  • Electromagnetism (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Mechanical Engineering (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Materials For Medical Uses (AREA)
  • Conductive Materials (AREA)

Abstract

1449261 Conductive compositions RAYCHEM CORP 7 Sept 1973 [8 Sept 1972] 42139/73 Heading C3P [Also in Division H1] A non-linear PTC resistive device which may be used for heat tracing pipes in chemical plants to prevent freezing or to maintain flow of viscous materials, for heat sensing, or for circuit breaking comprises two parallel wires (e.g. of tinned copper) between which is extruded a crystalline polymer/carbon black mix containing up to 15 wt. per cent carbon black, the mix being surrounded with an extended insulating jacket and the composite then being annealed at above 120‹ C. and above the crystalline melting point (or range) of the polymer, the material of the jacket being chosen to be form-stable at the annealing temperature and to show residual strain when raised from room temperature to the annealing temperature. The carbon content and annealing conditions are chosen to produce a room temperature resistivity in the range 5-10<SP>5</SP> ohm-cm. Annealing may be a single stage process or effected in 3 steps with intervening returns to room temperature. After annealing a sheath (e.g. of polyethylene) may be provided and the device exposed to irradiation (e.g. 1 MeVat, 2-15 Mrads) to crosslink the polymer while keeping its crystallinity above 20%. The polymer may be one or more of polyethylene, polypropylene, polybutene-1, poly-(dodecamethylene pyromellitimide), copolymers of ethylene and propylene and terpolymers with non-conjugated dienes, polyvinylidene fluoride, copolymers of vinylidene fluoride and tetrafluoroethylene, and copolymers of ethylene and vinylacetate or ethylacrylate. Typically, a master batch of carbon in a minor component such as copoly-(ethylene/vinylacetate or ethylacrylate) has mixed therewith a major component such as polyethylene, the two components being non-compatible. Waxes and antioxidants may be included. Jacket materials (non-compatible with the polymer) are polyether- or polyester-based polyurethanes, copolymers of vinylidene fluoride and hexafluoropropene, polyvinylidene fluoride, silicones and silicone rubbers. (Nylon jacketing is used for comparison). The jacket may be directly extruded over the extruded polymer/ carbon mix or may be extruded as a tube and vacuum-collapsed on to the extruded mix. Specification 1,449,262 is referred to.
GB4213973A 1972-09-08 1973-09-07 Self-limitting conductive extrudates and methods for their manufacture Expired GB1449261A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US28744272A 1972-09-08 1972-09-08

Publications (1)

Publication Number Publication Date
GB1449261A true GB1449261A (en) 1976-09-15

Family

ID=23102932

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4213973A Expired GB1449261A (en) 1972-09-08 1973-09-07 Self-limitting conductive extrudates and methods for their manufacture

Country Status (7)

Country Link
JP (1) JPS4968297A (en)
BE (1) BE804627A (en)
CA (1) CA1014314A (en)
DE (1) DE2345320C2 (en)
FR (1) FR2199172B1 (en)
GB (1) GB1449261A (en)
HK (1) HK1382A (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4935156A (en) * 1981-09-09 1990-06-19 Raychem Corporation Conductive polymer compositions
US5025131A (en) * 1981-09-09 1991-06-18 Raychem Corporation Method of heating diesel fuel utilizing conductive polymer heating elements
US5093898A (en) * 1981-09-09 1992-03-03 Raychem Corporation Electrical device utilizing conductive polymer composition
US5864280A (en) * 1995-09-29 1999-01-26 Littlefuse, Inc. Electrical circuits with improved overcurrent protection
US6023403A (en) 1996-05-03 2000-02-08 Littlefuse, Inc. Surface mountable electrical device comprising a PTC and fusible element
US6282072B1 (en) 1998-02-24 2001-08-28 Littelfuse, Inc. Electrical devices having a polymer PTC array
US6582647B1 (en) 1998-10-01 2003-06-24 Littelfuse, Inc. Method for heat treating PTC devices
US6628498B2 (en) 2000-08-28 2003-09-30 Steven J. Whitney Integrated electrostatic discharge and overcurrent device
US7843308B2 (en) 2002-04-08 2010-11-30 Littlefuse, Inc. Direct application voltage variable material
CN110480863A (en) * 2018-05-15 2019-11-22 东芝机械株式会社 The manufacturing method of conductive composite material

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4188276A (en) * 1975-08-04 1980-02-12 Raychem Corporation Voltage stable positive temperature coefficient of resistance crosslinked compositions
US4388607A (en) 1976-12-16 1983-06-14 Raychem Corporation Conductive polymer compositions, and to devices comprising such compositions
GB1597007A (en) * 1976-12-16 1981-09-03 Raychem Corp Conductive polymer compositions and devices
US4237441A (en) * 1978-12-01 1980-12-02 Raychem Corporation Low resistivity PTC compositions
US4277673A (en) * 1979-03-26 1981-07-07 E-B Industries, Inc. Electrically conductive self-regulating article
JPS59102940A (en) * 1982-12-06 1984-06-14 Hitachi Cable Ltd Resin composition for heater with self-controllable temperature
US5494610A (en) * 1992-06-29 1996-02-27 Lovell; Walter C. Apparatus and method for providing medium temperature conductive-resistant articles

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE562035A (en) *
US3243753A (en) * 1962-11-13 1966-03-29 Kohler Fred Resistance element
US3351882A (en) * 1964-10-09 1967-11-07 Polyelectric Corp Plastic resistance elements and methods for making same
US3410984A (en) * 1966-05-03 1968-11-12 Gen Electric Flexible electrically heated personal warming device
US3435401A (en) * 1966-10-05 1969-03-25 Texas Instruments Inc Insulated electrical conductors
GB1201166A (en) * 1967-12-04 1970-08-05 Ici Ltd Conducting plastic articles
CA949637A (en) * 1970-08-03 1974-06-18 Henry J. Stinger Process for making electrically conductive heating elements

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4935156A (en) * 1981-09-09 1990-06-19 Raychem Corporation Conductive polymer compositions
US5025131A (en) * 1981-09-09 1991-06-18 Raychem Corporation Method of heating diesel fuel utilizing conductive polymer heating elements
US5093898A (en) * 1981-09-09 1992-03-03 Raychem Corporation Electrical device utilizing conductive polymer composition
US6059997A (en) * 1995-09-29 2000-05-09 Littlelfuse, Inc. Polymeric PTC compositions
US5880668A (en) * 1995-09-29 1999-03-09 Littelfuse, Inc. Electrical devices having improved PTC polymeric compositions
US5864280A (en) * 1995-09-29 1999-01-26 Littlefuse, Inc. Electrical circuits with improved overcurrent protection
US6023403A (en) 1996-05-03 2000-02-08 Littlefuse, Inc. Surface mountable electrical device comprising a PTC and fusible element
US6282072B1 (en) 1998-02-24 2001-08-28 Littelfuse, Inc. Electrical devices having a polymer PTC array
US6582647B1 (en) 1998-10-01 2003-06-24 Littelfuse, Inc. Method for heat treating PTC devices
US6628498B2 (en) 2000-08-28 2003-09-30 Steven J. Whitney Integrated electrostatic discharge and overcurrent device
US7843308B2 (en) 2002-04-08 2010-11-30 Littlefuse, Inc. Direct application voltage variable material
CN110480863A (en) * 2018-05-15 2019-11-22 东芝机械株式会社 The manufacturing method of conductive composite material
CN110480863B (en) * 2018-05-15 2023-07-28 芝浦机械株式会社 Method for producing conductive composite material

Also Published As

Publication number Publication date
HK1382A (en) 1982-01-22
DE2345320A1 (en) 1974-04-04
CA1014314A (en) 1977-07-26
BE804627A (en) 1974-03-07
FR2199172B1 (en) 1977-09-02
JPS4968297A (en) 1974-07-02
FR2199172A1 (en) 1974-04-05
DE2345320C2 (en) 1984-11-08

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee