SE8304042L - TAPE HEATER WITH ELECTRICAL DEVICES INCLUDING LEADING POLYMER COMPOSITIONS - Google Patents

TAPE HEATER WITH ELECTRICAL DEVICES INCLUDING LEADING POLYMER COMPOSITIONS

Info

Publication number
SE8304042L
SE8304042L SE8304042A SE8304042A SE8304042L SE 8304042 L SE8304042 L SE 8304042L SE 8304042 A SE8304042 A SE 8304042A SE 8304042 A SE8304042 A SE 8304042A SE 8304042 L SE8304042 L SE 8304042L
Authority
SE
Sweden
Prior art keywords
composition
electrode
electrical devices
devices including
polymer compositions
Prior art date
Application number
SE8304042A
Other languages
Swedish (sv)
Other versions
SE447781B (en
SE8304042D0 (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=***_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=SE8304042(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 SE8304042L publication Critical patent/SE8304042L/en
Publication of SE8304042D0 publication Critical patent/SE8304042D0/en
Publication of SE447781B publication Critical patent/SE447781B/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—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • H05B3/12—Heater 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—Heater 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

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.

Claims (3)

PATENTKRAV 1. Bandvarmare, innefattandeCLAIMS 1. Band heaters, comprising 1. en lAngstrackt karna av en ledande polymerkomposition corn uppvisar PTC-beteende och innehAller kimrdk;1. An elongated core of a conductive polymer composition exhibits PTC behavior and contains carbon dioxide; 2. minst tvA langsglende elektroder inhaddade i kompositiOnen parallellt med varandra; och2. at least two longitudinal electrodes embedded in the composition parallel to each other; and 3. ett yttre skikt av en skyddande och isolerande komposition, kannetecknad av att det genomsnittliga linearitetsforhAllandet mellan elektroderna Ur hoyst 1,2 och att, om kimrdkshalten L ar mindre an 15 viktprocent, L och komfositionens resistivitet R uttryckt i ohmcm, hr sAdana, att uttrycket 2 L + 5 log R 0 ar satifierat.3. an outer layer of a protective and insulating composition, characterized in that the average linearity ratio between the electrodes is not more than 1.2 and that, if the chemical content L is less than 15% by weight, L and the resistivity R of the composition expressed in ohms, Mr. sAdana, that the expression 2 L + 5 log R 0 is satified.
SE8304042A 1976-12-13 1983-07-19 BANDVERMARE SE447781B (en)

Applications Claiming Priority (1)

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

Publications (3)

Publication Number Publication Date
SE8304042L true SE8304042L (en) 1983-07-19
SE8304042D0 SE8304042D0 (en) 1983-07-19
SE447781B SE447781B (en) 1986-12-08

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 SE8505088L (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 Before (1)

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

Family Applications After (1)

Application Number Title Priority Date Filing Date
SE8505088A SE8505088L (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
CA1168433A (en) * 1980-05-19 1984-06-05 Umesh K. Sopory Ptc conductive polymers and devices comprising them
US4591700A (en) * 1980-05-19 1986-05-27 Raychem Corporation PTC compositions
US4309596A (en) * 1980-06-24 1982-01-05 Sunbeam Corporation Flexible self-limiting heating cable
ATE77155T1 (en) 1983-06-30 1992-06-15 Raychem Corp METHOD OF DETECTING AND OBTAINING INFORMATION ABOUT THE CHANGES OF 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 (7)

* 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
US3858144A (en) 1972-12-29 1974-12-31 Raychem Corp Voltage stress-resistant conductive articles
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
JPH03257783A (en) 1991-11-18
JPH0256886A (en) 1990-02-26
DE2755077A1 (en) 1978-06-29
GB1600257A (en) 1981-10-14
NL185545B (en) 1989-12-01
DE2755077C2 (en) 1987-06-11
JPS6057192B2 (en) 1985-12-13
FR2392572A1 (en) 1978-12-22
SE447781B (en) 1986-12-08
SE434587B (en) 1984-07-30
AU3139477A (en) 1979-06-14
NO147735B (en) 1983-02-21
GB1600256A (en) 1981-10-14
NL7713800A (en) 1978-06-15
SE8505088D0 (en) 1985-10-28
BE861776A (en) 1978-06-12
JPS5395298A (en) 1978-08-21
SE8304042D0 (en) 1983-07-19
NO147735C (en) 1983-06-01
CA1206507B (en) 1986-06-24
JPH0256887A (en) 1990-02-26
NL185545C (en) 1995-01-16
CA1106890A (en) 1981-08-11
JPH053120B2 (en) 1993-01-14
NO774258L (en) 1978-06-14
JPH0559557B2 (en) 1993-08-31
SE8505088L (en) 1985-10-28
JPH0562439B2 (en) 1993-09-08
AU515034B2 (en) 1981-03-12
FR2392572B1 (en) 1984-03-30
SE7714126L (en) 1978-06-14

Similar Documents

Publication Publication Date Title
US4277673A (en) Electrically conductive self-regulating article
US4246468A (en) Electrical devices containing PTC elements
AU555857B2 (en) Elongate heater
SE8304042L (en) TAPE HEATER WITH ELECTRICAL DEVICES INCLUDING LEADING POLYMER COMPOSITIONS
US4668857A (en) Temperature self-regulating resistive heating element
US4560524A (en) Method of manufacturing a positive temperature coefficient resistive heating element
US4367168A (en) Electrically conductive composition, process for making an article using same
US4327480A (en) Electrically conductive composition, process for making an article using same
GB2106920A (en) Conductive polymer compositions based on polyvinylidene fluoride
FR2652477A1 (en) CUT TO LENGH HEATER CABLE.
US5025131A (en) Method of heating diesel fuel utilizing conductive polymer heating elements
JPS6231995Y2 (en)
JPS63219102A (en) Ptc resistance material
JP3265717B2 (en) Positive resistance temperature coefficient heating element and method of manufacturing the same
CA1173884A (en) Ptc heater assembly
JP3493690B2 (en) Heat-sensitive resin material and heat-sensitive body, heat-sensitive heat generator
CA2098154C (en) Heating cable
JPH0421997B2 (en)
JPH05135854A (en) Heating unit with positive resistance temperature coefficient
JPS60135441A (en) Semiconducting resin composition
JPS61195577A (en) Heating wire
JPH0359986A (en) Heating body with positive resistance temperature coefficient
JPH0696842A (en) Positive resistance temperature coefficient heating element and manufacture thereof
JPH076903A (en) Heat sensitive resin material and heat sensitive heating element
JP2572429C (en)

Legal Events

Date Code Title Description
NAL Patent in force

Ref document number: 8304042-8

Format of ref document f/p: F

NUG Patent has lapsed

Ref document number: 8304042-8

Format of ref document f/p: F