EP0803879B1 - Composition polymère conductrice - Google Patents

Composition polymère conductrice Download PDF

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Publication number
EP0803879B1
EP0803879B1 EP97201655A EP97201655A EP0803879B1 EP 0803879 B1 EP0803879 B1 EP 0803879B1 EP 97201655 A EP97201655 A EP 97201655A EP 97201655 A EP97201655 A EP 97201655A EP 0803879 B1 EP0803879 B1 EP 0803879B1
Authority
EP
European Patent Office
Prior art keywords
carbon black
conductive polymer
electrical device
less
composition
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
EP97201655A
Other languages
German (de)
English (en)
Other versions
EP0803879A1 (fr
Inventor
Jeff Shafe
O. James Straley
Gordon Mccarty
Ravinder K. Oswal
Bernadette A Trammell
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.)
TE Connectivity Corp
Original Assignee
Tyco Electronics 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
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Application filed by Tyco Electronics Corp filed Critical Tyco Electronics Corp
Publication of EP0803879A1 publication Critical patent/EP0803879A1/fr
Application granted granted Critical
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Classifications

    • 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
    • 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

Definitions

  • Carbon blacks with suitable size, surface area and structure for use in PTC compositions are well-known. Guidelines for selecting such carbon blacks are found in U.S Patent Nos. 4,237,441 (van Konynenburg et al.) and 4,388,607 (Toy et al.). In general, carbon blacks with a relatively large particle size, D (measured in nanometers), e.g. greater than 18 nm, and relatively high structure, e.g. greater than about 70 cc/100 g, are preferred for PTC compositions.
  • D measured in nanometers
  • relatively high structure e.g. greater than about 70 cc/100 g
  • the electrical devices of the invention show improved stability under thermal aging and electrical stress.
  • the resistance at 20°C measured after aging i.e. R f50
  • the resistance at 20°C measured after aging will differ from the initial resistance at 20°C, i.e. R i , by no more than 75%, preferably no more than 60%, particularly no more than 50%, producing an R f50 of from 0.25 R i to 1.75 R i , preferably from 0.40 R i to 1.60 R i , particularly from 0.50 R i to 1.50 R i .
  • an ink was prepared by blending the designated percent by weight (of solids) of the appropriate carbon black with dimethyl formamide in a high shear mixer. The solution was then filtered and powdered KynarTM 9301 (a terpolymer of vinylidene fluoride, hexafluoropropylene, and tetrafluoroethylene with a melting point of about 88°C, available from Pennwalt) in an amount equal to (100 - % carbon black) was added to the filtrate and allowed to dissolve over a period of 24 to 72 hours. (Approximately 60% solvent and 40% solids was used in making the ink).
  • KynarTM 9301 a terpolymer of vinylidene fluoride, hexafluoropropylene, and tetrafluoroethylene with a melting point of about 88°C, available from Pennwalt
  • fibers were prepared by blending 55% by weight ElvaxTM 250 (ethylene vinyl acetate copolymer with a melting point of 60°C, available from Dow) and 45% by weight RavenTM 22 (carbon black with a pH of 7.0, a particle size of 62 nm, a surface area of 25 m 2 /g, and a DBP of 113 cc/100 g, available from Columbian Chemicals).
  • An ink was prepared by dissolving the fibers in xylene. After 813 hours at 52°C, the R n value was 0.94.
  • Fibers were prepared from 76% by weight PFATM 340 (a copolymer of tetrafluoroethylene and a perfluorovinyl ether with a T m of 307°C, available from du Pont) and 24% by weight RavenTM 600 (carbon black with a pH of 8.3, particle size of 65 nm, DBP of 82 cc/100g, and surface area of 34 m 2 /g, available from Columbian Chemicals) as in Example 15. Samples tested at 311°C for 50 hours had an R n of 0.55.
  • PFATM 340 a copolymer of tetrafluoroethylene and a perfluorovinyl ether with a T m of 307°C, available from du Pont
  • RavenTM 600 carbon black with a pH of 8.3, particle size of 65 nm, DBP of 82 cc/100g, and surface area of 34 m 2 /g, available from Columbian Chemicals

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Ceramic Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Conductive Materials (AREA)
  • Thermistors And Varistors (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)
  • Resistance Heating (AREA)

Claims (8)

  1. Dispositif électrique qui comprend :
    (I)
    (A) un élément à coefficient de température positif comprenant une composition polymère conductrice présentant un comportement à coefficient de température positif, et comprenant :
    (a) au moins un polymère organique ayant une cristallinité d'au moins 15 % ; et
    (b) au moins 4 % en masse de la composition d'un noir de carbone ayant un PH de moins de 4,0 ;
    et dans lequel la totalité du ou des polymères organiques dans la composition polymère conductrice présente une cristallinité totale d'au moins 5 % et un point de fusion Tm ; et
    (B) deux électrodes qui peuvent être connectées à une source de courant électrique pour faire passer le courant dans l'élément à coefficient de température positif ;
    (II) a une résistance Ri à 20°C ; et
    (III)est tel que, s'il est maintenu à Tm pendant 50 heures, puis refroidi à 20°C, il présente une résistance à 20°C de 0,25 Ri à 1,75 Ri ;
       caractérisé en ce que
    (IV) le dispositif électrique est un dispositif de protection de circuit ;
    (V) la composition polymère conductrice a une résistivité de 0,1 à 100 ohm-cm ;
    (VI) l'élément à coefficient de température positif est un élément laminaire ; et
    (VII)les électrodes sont des électrodes en tôle métallique ou en peinture conductrice fixées sur l'élément à coefficient de température positif.
  2. Dispositif électrique selon la revendication 1, caractérisé en ce que le noir de carbone ayant un pH de moins de 4,0 est la seule charge conductrice dans la composition polymère conductrice.
  3. Dispositif électrique selon la revendication 1 ou 2, caractérisé en ce que le noir de carbone a un pH de moins de 3,0.
  4. Dispositif électrique selon l'une quelconque des revendications précédentes, caractérisé en ce que le polymère conducteur comprend une encre polymère pour film épais.
  5. Dispositif électrique selon l'une quelconque des revendications précédentes, caractérisé en ce que le polymère conducteur a été réticulé.
  6. Dispositif électrique selon l'une quelconque des revendications précédentes, caractérisé en ce que la composition comprend en outre (i) du noir de carbone ayant un pH qui est d'au moins 5,0 ou (ii) du graphite.
  7. Dispositif électrique selon l'une quelconque des revendications précédentes, caractérisé en ce que le polymère est un fluoropolymère.
  8. Dispositif électrique selon l'une quelconque des revendications précédentes, caractérisé en ce que le noir de carbone a une taille de particules de D nanomètres et une résistivité à sec RCB telle que (RCB/D) soit inférieur ou égal à 0,1.
EP97201655A 1988-09-20 1989-09-15 Composition polymère conductrice Expired - Lifetime EP0803879B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US24705988A 1988-09-20 1988-09-20
US247059 1988-09-20
EP89910755A EP0435923B1 (fr) 1988-09-20 1989-09-15 Composition polymere conductrice

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP89910755A Division EP0435923B1 (fr) 1988-09-20 1989-09-15 Composition polymere conductrice
EP89910755.1 Division 1990-04-10

Publications (2)

Publication Number Publication Date
EP0803879A1 EP0803879A1 (fr) 1997-10-29
EP0803879B1 true EP0803879B1 (fr) 2004-03-24

Family

ID=22933384

Family Applications (2)

Application Number Title Priority Date Filing Date
EP89910755A Expired - Lifetime EP0435923B1 (fr) 1988-09-20 1989-09-15 Composition polymere conductrice
EP97201655A Expired - Lifetime EP0803879B1 (fr) 1988-09-20 1989-09-15 Composition polymère conductrice

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP89910755A Expired - Lifetime EP0435923B1 (fr) 1988-09-20 1989-09-15 Composition polymere conductrice

Country Status (7)

Country Link
EP (2) EP0435923B1 (fr)
JP (2) JP2876549B2 (fr)
KR (1) KR100224945B1 (fr)
AT (2) ATE262725T1 (fr)
CA (1) CA1334480C (fr)
DE (2) DE68928502T2 (fr)
WO (1) WO1990003651A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1267672B1 (it) * 1994-01-17 1997-02-07 Hydor Srl Composto resistivo termosensibile, suo metodo di realizzazione ed uso
DE10310722A1 (de) 2003-03-10 2004-09-23 Tesa Ag Elektrisch erwärmbare Haftklebemasse
DE102007007617A1 (de) 2007-02-13 2008-08-14 Tesa Ag Intrinsisch erwärmbare heißschmelzklebrige Flächengebilde
DE102008034748A1 (de) 2008-07-24 2010-01-28 Tesa Se Flexibles beheiztes Flächenelement
DE102008063849A1 (de) 2008-12-19 2010-06-24 Tesa Se Beheiztes Flächenelement und Verfahren zu seiner Befestigung
DE102009010437A1 (de) 2009-02-26 2010-09-02 Tesa Se Beheiztes Flächenelement
US20130193384A1 (en) * 2012-01-31 2013-08-01 E. I. Du Pont De Nemours And Company Polymer thick film positive temperature coefficient carbon composition
JP7309444B2 (ja) * 2018-07-05 2023-07-18 キヤノン株式会社 樹脂組成物、樹脂成形体、樹脂積層体、カートリッジ、画像形成装置、樹脂成形体の製造方法、樹脂積層体の製造方法およびカートリッジの製造方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US4591700A (en) * 1980-05-19 1986-05-27 Raychem Corporation PTC compositions
EP0123540A3 (fr) * 1983-04-20 1985-01-02 RAYCHEM CORPORATION (a California corporation) Polymères conducteurs et dispositifs contenant ceux-ci
US4668857A (en) * 1985-08-16 1987-05-26 Belton Corporation Temperature self-regulating resistive heating element
AU589714B2 (en) * 1985-12-06 1989-10-19 Sunbeam Corp. PTC compositions containing a non-surface treated carbon black having an intermediate resistivity for reduced annealing

Also Published As

Publication number Publication date
JPH04500745A (ja) 1992-02-06
DE68929517T2 (de) 2005-02-03
EP0803879A1 (fr) 1997-10-29
CA1334480C (fr) 1995-02-21
EP0435923B1 (fr) 1997-12-17
HK1021613A1 (en) 2000-06-16
JP2955281B2 (ja) 1999-10-04
EP0435923A1 (fr) 1991-07-10
DE68928502D1 (de) 1998-01-29
DE68928502T2 (de) 1998-06-18
DE68929517D1 (de) 2004-04-29
KR100224945B1 (ko) 1999-10-15
JP2876549B2 (ja) 1999-03-31
WO1990003651A1 (fr) 1990-04-05
ATE262725T1 (de) 2004-04-15
ATE161354T1 (de) 1998-01-15
JPH11144907A (ja) 1999-05-28
KR900702544A (ko) 1990-12-07

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