GB1366047A - Nonflammable compositions resistor - Google Patents

Nonflammable compositions resistor

Info

Publication number
GB1366047A
GB1366047A GB3928772A GB3928772A GB1366047A GB 1366047 A GB1366047 A GB 1366047A GB 3928772 A GB3928772 A GB 3928772A GB 3928772 A GB3928772 A GB 3928772A GB 1366047 A GB1366047 A GB 1366047A
Authority
GB
United Kingdom
Prior art keywords
powder
resistor
resin
temperature
conducting
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
GB3928772A
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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
Priority claimed from JP46064544A external-priority patent/JPS5117717B2/ja
Priority claimed from JP46098552A external-priority patent/JPS515196B2/ja
Priority claimed from JP47000531A external-priority patent/JPS4869093A/ja
Priority claimed from JP61372A external-priority patent/JPS545116B2/ja
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Publication of GB1366047A publication Critical patent/GB1366047A/en
Expired legal-status Critical Current

Links

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
    • H01C7/001—Mass resistors
    • 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
    • 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
    • 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
    • H01C7/06—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 including means to minimise changes in resistance with changes in temperature

Landscapes

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

Abstract

1366047 Resistors MATSUSHITA ELECTRIC INDUSTRIAL CO Ltd 23 Aug 1972 [23 Aug 1971 6 Dec 1971 23 Dec 1971 27 Dec 1971] 39287/72 Heading HIS A non-inflammable composition resistor comprises a finely divided conducting powder, silica powder, and an additive powder dispersed in a resin. The additive powder has a transformation temperature in the range Tg‹ C. to (Tg + 200)‹ C., where Tg‹ C. is the glass transition temperature of the resin, i.e. the temperature above which the resin attains a glassy state and the transformation temperature is defined as the temperature below which an increase in the temperature causes a small decrease (caused by vaporization, decomposition or sublimation) in the weight of the powder but above which an increase in the temperature causes a great decrease in the weight. Materials and process for making.-The conducting powder may be carbon black, graphite, metal, metal alloys or mixtures thereof. The additive powder, preferably high purity, can be selected from the group consisting of carbocyclic and heterocyclic compounds, e.g. anthracene, anthraquinone, 1 - nitroanthraquinone, terephthalic acid, p-terphenyl, phenolphthalein, carbazole, perchloropentacyclodecane, or copper phthalocyanine. A thermosetting resin, e.g. phenol, urea, melamine or epoxy resins, or mixtures, may be used. Terminal members may be made of copper-chromium alloy, copper-clad iron, brass, iron or bronze, and may be solder coated. A mixture of conducting powder, silica powder and an additive powder in resin is well mixed at 50‹ to 100‹ C., e.g. by a hot rolling method, cooled and crushed into granules. A further mixture of silica powder and resin is also prepared to form the material for an outer sleeve. A resistor body with outer sleeve can then be made by extrusion or pressing after which the terminals are applied by pressing and the resistor stabilized by heating at 130‹ to 170‹ C. from 5 to 78 hours. Numerous examples of different compositions and tests carried out on them are described. Principle of operation.-It is stated that the resistance of conventional composition resistors when passing an overcurrent decreases because of joule heating, which further increases the current and therefore the heating until the resistor burns out. If the resistor includes an additive powder and is heated the powder emits a gas, which because of the bulk of resin around the powder and the conducting particles attains a very high vapour pressure. If the temperature of the resistor body is then Tg or greater the resin loses its resilience and the conducting particles become widely separated under the high pressure of the gas. This leads to an irreversible increase in the resistance of some 5 to 100 times. The current through the resistor therefore decreases and the resistor does not burn.
GB3928772A 1971-08-23 1972-08-23 Nonflammable compositions resistor Expired GB1366047A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP46064544A JPS5117717B2 (en) 1971-08-23 1971-08-23
JP46098552A JPS515196B2 (en) 1971-12-06 1971-12-06
JP47000531A JPS4869093A (en) 1971-12-23 1971-12-23
JP61372A JPS545116B2 (en) 1971-12-27 1971-12-27

Publications (1)

Publication Number Publication Date
GB1366047A true GB1366047A (en) 1974-09-11

Family

ID=27453199

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3928772A Expired GB1366047A (en) 1971-08-23 1972-08-23 Nonflammable compositions resistor

Country Status (6)

Country Link
CA (1) CA956375A (en)
DE (1) DE2242015C3 (en)
FR (1) FR2150441B1 (en)
GB (1) GB1366047A (en)
IT (1) IT962174B (en)
NL (1) NL7211505A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS568457B2 (en) * 1973-05-30 1981-02-24 Matsushita Electric Ind Co Ltd
US4317027A (en) * 1980-04-21 1982-02-23 Raychem Corporation Circuit protection devices
CA2004760C (en) * 1988-12-09 1998-12-01 Norio Mori Composite temperature-sensitive element and face heat generator comprising the same
DE4242368A1 (en) * 1992-12-16 1994-07-07 Licentia Gmbh Resistance material and resistance made from it

Also Published As

Publication number Publication date
FR2150441B1 (en) 1974-08-19
DE2242015B2 (en) 1975-04-30
FR2150441A1 (en) 1973-04-06
DE2242015A1 (en) 1973-03-29
IT962174B (en) 1973-12-20
DE2242015C3 (en) 1975-12-11
CA956375A (en) 1974-10-15
NL7211505A (en) 1973-02-27

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Legal Events

Date Code Title Description
PS Patent sealed
746 Register noted 'licences of right' (sect. 46/1977)
PCNP Patent ceased through non-payment of renewal fee