SE7714126L - ELECTRICAL DEVICES INCLUDING LEADING POLYMER COMPOSITIONS - Google Patents

ELECTRICAL DEVICES INCLUDING LEADING POLYMER COMPOSITIONS

Info

Publication number
SE7714126L
SE7714126L SE7714126A SE7714126A SE7714126L SE 7714126 L SE7714126 L SE 7714126L SE 7714126 A SE7714126 A SE 7714126A SE 7714126 A SE7714126 A SE 7714126A SE 7714126 L SE7714126 L SE 7714126L
Authority
SE
Sweden
Prior art keywords
composition
electrode
electrical devices
melting point
degree
Prior art date
Application number
SE7714126A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE434587B (en
Inventor
H P Kamath
J C Leder
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=25016715&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=SE7714126(L) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Raychem Corp filed Critical Raychem Corp
Publication of SE7714126L publication Critical patent/SE7714126L/en
Publication of SE434587B publication Critical patent/SE434587B/en

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
    • H05B3/14—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
    • H05B3/146—Conductive polymers, e.g. polyethylene, thermoplastics
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Ceramic Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Dispersion Chemistry (AREA)
  • Resistance Heating (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Conductive Materials (AREA)
  • Thermistors And Varistors (AREA)
  • Control Of Resistance Heating (AREA)
  • Apparatuses And Processes For Manufacturing Resistors (AREA)

Abstract

The invention relates to electrical devices comprising an electrode and a conductive polymer composition, preferably a PTC composition, in contact with the electrode. The process of the invention comprises contacting the composition and the electrode while the composition is at a temperature(Tp) above its melting point (Tm) and the electrode is at a temperature (Te) above the melting point of the composition, Tp and Te being the same or different, for a time which is sufficient to reduce the contact resistance between the electrode and the composition but which is not sufficient substantially to reduce the resistivity of the composition, for example, 2 time less than 5 minutes. Preferably both Tp and Te are at least 20.degree.C, especially at least 55.degree.C, above Tm. In a preferred process the composition is melt-extruded over one of more pre-heated electrodes. It has been found that the process of the invention substantially reduces the tendency of the resistance of the device to increase when the device is subject to thermal cycling. The invention is particularly useful in connection with self-regulating heaters, especially strip heaters comprising a pair of stranded wire electrodes embedded in an elongate core of a PTC material comprising carbon black dispersed in a crystalline polymer.
SE7714126A 1976-12-13 1977-12-13 PROCEDURE FOR MANUFACTURING AN ELECTRIC DEVICE INCLUDING AN ELECTRICAL AND ELECTRIC LEADING POLYMER COMPOSITION SE434587B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US75014976A 1976-12-13 1976-12-13

Publications (2)

Publication Number Publication Date
SE7714126L true SE7714126L (en) 1978-06-14
SE434587B SE434587B (en) 1984-07-30

Family

ID=25016715

Family Applications (3)

Application Number Title Priority Date Filing Date
SE7714126A SE434587B (en) 1976-12-13 1977-12-13 PROCEDURE FOR MANUFACTURING AN ELECTRIC DEVICE INCLUDING AN ELECTRICAL AND ELECTRIC LEADING POLYMER COMPOSITION
SE8304042A SE447781B (en) 1976-12-13 1983-07-19 BANDVERMARE
SE8505088A SE8505088D0 (en) 1976-12-13 1985-10-28 PROCEDURE FOR THE MANUFACTURING OF AN ELECTRICAL DEVICE, INCLUDING AN ELECTRODE AND THIS RELATED POLYMER COMPOSITION

Family Applications After (2)

Application Number Title Priority Date Filing Date
SE8304042A SE447781B (en) 1976-12-13 1983-07-19 BANDVERMARE
SE8505088A SE8505088D0 (en) 1976-12-13 1985-10-28 PROCEDURE FOR THE MANUFACTURING OF AN ELECTRICAL DEVICE, INCLUDING AN ELECTRODE AND THIS RELATED POLYMER COMPOSITION

Country Status (10)

Country Link
JP (4) JPS6057192B2 (en)
AU (1) AU515034B2 (en)
BE (1) BE861776A (en)
CA (2) CA1106890A (en)
DE (1) DE2755077A1 (en)
FR (1) FR2392572A1 (en)
GB (2) GB1600256A (en)
NL (1) NL185545C (en)
NO (1) NO147735C (en)
SE (3) SE434587B (en)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4238812A (en) * 1978-12-01 1980-12-09 Raychem Corporation Circuit protection devices comprising PTC elements
FR2456453A1 (en) * 1979-05-10 1980-12-05 Sunbeam Corp FLEXIBLE HEATING ELEMENT AND MANUFACTURING METHOD THEREOF
CA1156300A (en) * 1980-04-01 1983-11-01 Gordon S. Carlson Electric blanket safety circuit
US4591700A (en) * 1980-05-19 1986-05-27 Raychem Corporation PTC compositions
CA1168433A (en) * 1980-05-19 1984-06-05 Umesh K. Sopory Ptc conductive polymers and devices comprising them
US4309596A (en) * 1980-06-24 1982-01-05 Sunbeam Corporation Flexible self-limiting heating cable
EP0250776B1 (en) 1983-06-30 1992-06-10 RAYCHEM CORPORATION (a Delaware corporation) Method for detecting and obtaining information about changes in variables
GB8623082D0 (en) * 1986-09-25 1986-10-29 Raychem Gmbh Heated conduit
DE4024268A1 (en) * 1990-07-31 1992-02-06 Lehmann & Voss & Co Electroconductive plastics element for heater or electronic device - contains synergistic mixt. of carbon or graphite powder and fibres and opt. metal fibres
DE4307371A1 (en) * 1993-03-09 1994-09-15 Hit Hillesheim Innovations Und Heatable line for a flow medium
DE4426188A1 (en) * 1994-07-23 1996-01-25 Mekra Rangau Plastics Outside mirrors for motor vehicles
CN113635534A (en) * 2021-08-10 2021-11-12 芜湖佳宏新材料股份有限公司 Process method for reducing contact resistance of conductive polymer and metal conductor

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB828334A (en) * 1956-10-30 1960-02-17 British Insulated Callenders Improvements in or relating to electrically conductive non-metallic materials
US3861029A (en) * 1972-09-08 1975-01-21 Raychem Corp Method of making heater cable
JPS5530669B2 (en) * 1974-03-29 1980-08-12
JPS5432173B2 (en) * 1974-03-29 1979-10-12
US4177376A (en) * 1974-09-27 1979-12-04 Raychem Corporation Layered self-regulating heating article
ES454025A1 (en) * 1975-12-08 1977-11-16 Raychem Corp Expansible heater

Also Published As

Publication number Publication date
GB1600257A (en) 1981-10-14
SE447781B (en) 1986-12-08
NL185545C (en) 1995-01-16
NO147735C (en) 1983-06-01
NL7713800A (en) 1978-06-15
SE8505088L (en) 1985-10-28
JPH0562439B2 (en) 1993-09-08
JPH0256886A (en) 1990-02-26
AU515034B2 (en) 1981-03-12
CA1206507B (en) 1986-06-24
CA1106890A (en) 1981-08-11
NL185545B (en) 1989-12-01
SE8304042L (en) 1983-07-19
FR2392572A1 (en) 1978-12-22
NO774258L (en) 1978-06-14
FR2392572B1 (en) 1984-03-30
SE8304042D0 (en) 1983-07-19
BE861776A (en) 1978-06-12
AU3139477A (en) 1979-06-14
GB1600256A (en) 1981-10-14
JPH053120B2 (en) 1993-01-14
DE2755077C2 (en) 1987-06-11
DE2755077A1 (en) 1978-06-29
SE434587B (en) 1984-07-30
JPH03257783A (en) 1991-11-18
SE8505088D0 (en) 1985-10-28
JPH0559557B2 (en) 1993-08-31
JPS5395298A (en) 1978-08-21
JPH0256887A (en) 1990-02-26
NO147735B (en) 1983-02-21
JPS6057192B2 (en) 1985-12-13

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