EP0803879B1 - Leitfähige Polymerzusammensetzung - Google Patents

Leitfähige Polymerzusammensetzung 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
English (en)
French (fr)
Other versions
EP0803879A1 (de
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
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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/de
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)

Claims (8)

  1. Elektrische Vorrichtung, die folgendes aufweist:
    (I)
    (A) ein PTC-Element, das eine leitfähige Polymerzusammensetzung aufweist, die ein PTC-Verhalten aufweist, und die folgendes umfaßt:
    (a) wenigstens ein organisches Polymer, das eine Kristallinität von wenigstens 15% hat; und
    (b) wenigstens 4 Gew.-% der Zusammensetzung Ruß, der einen pH-Wert von weniger als 4,0 hat; und
    wobei die Gesamtheit des (der) organischen Polymers (Polymeren) in der leitfähigen Polymerzusammensetzung eine Gesamtkristallinität von wenigstens 5% und einen Schmelzpunkt Tm hat; und
    (B) zwei Elektroden, die an eine elektrische Stromquelle angeschlossen werden können, um Strom durch das PTC-Element fließen zu lassen;
    (II) mit einem Widerstand Ri bei 20°C; und
    (III) die Vorrichtung so ausgebildet ist, daß sie, wenn sie für 50 Stunden auf Tm gehalten, und anschließend auf 20°C abgekühlt worden ist, einen Widerstand bei 20°C von 0,25 Ri bis 1,75 Ri aufweist;
    dadurch gekennzeichnet, daß
    (IV) die elektrische Vorrichtung eine Stromkreisschutzvorrichtung ist;
    (V) die leitfähige Polymerzusammensetzung einen spezifischen Widerstand von 0,1 Ohm x cm bis 100 Ohm x cm hat;
    (VI) das PTC-Element ein laminares Element ist; und
    (VII) die Elektroden Metallblatt- bzw. Metallfolien oder leitfähige Lackelektroden sind, die mit dem PTC-Element verbunden sind.
  2. Elektrische Vorrichtung nach Anspruch 1,
    dadurch gekennzeichnet, daß
    der Ruß mit einem pH-Wert von weniger als 4,0 das einzige leitfähige Füllmittel in der leitfähigen Polymerzusammensetzung ist.
  3. Elektrische Vorrichtung nach Anspruch 1 oder 2,
    dadurch gekennzeichnet, daß
    der Ruß einen pH-Wert von weniger als 3,0 hat.
  4. Elektrische Vorrichtung nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, daß
    das leitfähige Polymer eine polymere dickflüssige Folientinte aufweist.
  5. Elektrische Vorrichtung nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, daß
    das leitfähige Polymer quervernetzt worden ist.
  6. Elektrische Vorrichtung nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, daß
    die Zusammensetzung ferner
    (i) Ruß mit einem pH-Wert von wenigstens 5,0 oder
    (ii) Graphit
    aufweist.
  7. Elektrische Vorrichtung nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, daß
    das Polymer ein Fluorpolymer ist.
  8. Elektrische Vorrichtung nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, daß
    der Ruß einen Teilchendurchmesser von D nm und trocken einen spezifischen Widerstand RCB hat, so daß (RCB/D) kleiner oder gleich 0,1 ist.
EP97201655A 1988-09-20 1989-09-15 Leitfähige Polymerzusammensetzung Expired - Lifetime EP0803879B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US24705988A 1988-09-20 1988-09-20
US247059 1988-09-20
EP89910755A EP0435923B1 (de) 1988-09-20 1989-09-15 Leitfähige polymerzusammensetzung

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP89910755A Division EP0435923B1 (de) 1988-09-20 1989-09-15 Leitfähige polymerzusammensetzung
EP89910755.1 Division 1990-04-10

Publications (2)

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

Family

ID=22933384

Family Applications (2)

Application Number Title Priority Date Filing Date
EP97201655A Expired - Lifetime EP0803879B1 (de) 1988-09-20 1989-09-15 Leitfähige Polymerzusammensetzung
EP89910755A Expired - Lifetime EP0435923B1 (de) 1988-09-20 1989-09-15 Leitfähige polymerzusammensetzung

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP89910755A Expired - Lifetime EP0435923B1 (de) 1988-09-20 1989-09-15 Leitfähige polymerzusammensetzung

Country Status (8)

Country Link
EP (2) EP0803879B1 (de)
JP (2) JP2876549B2 (de)
KR (1) KR100224945B1 (de)
AT (2) ATE161354T1 (de)
CA (1) CA1334480C (de)
DE (2) DE68929517T2 (de)
HK (1) HK1021613A1 (de)
WO (1) WO1990003651A1 (de)

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 (de) * 1983-04-20 1985-01-02 RAYCHEM CORPORATION (a California corporation) Leitfähige Polymere und diese enthaltende Einrichtungen
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
EP0435923B1 (de) 1997-12-17
JP2876549B2 (ja) 1999-03-31
DE68928502T2 (de) 1998-06-18
KR900702544A (ko) 1990-12-07
DE68929517T2 (de) 2005-02-03
ATE161354T1 (de) 1998-01-15
WO1990003651A1 (en) 1990-04-05
JP2955281B2 (ja) 1999-10-04
EP0803879A1 (de) 1997-10-29
HK1021613A1 (en) 2000-06-16
JPH11144907A (ja) 1999-05-28
JPH04500745A (ja) 1992-02-06
DE68928502D1 (de) 1998-01-29
DE68929517D1 (de) 2004-04-29
EP0435923A1 (de) 1991-07-10
KR100224945B1 (ko) 1999-10-15
CA1334480C (en) 1995-02-21
ATE262725T1 (de) 2004-04-15

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