EP0144399A1 - Contact stabilization coating material for electrical contact surfaces - Google Patents
Contact stabilization coating material for electrical contact surfacesInfo
- Publication number
- EP0144399A1 EP0144399A1 EP19840902287 EP84902287A EP0144399A1 EP 0144399 A1 EP0144399 A1 EP 0144399A1 EP 19840902287 EP19840902287 EP 19840902287 EP 84902287 A EP84902287 A EP 84902287A EP 0144399 A1 EP0144399 A1 EP 0144399A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- contact
- polyoxypropylene
- polyoxyethylene
- contact surfaces
- range
- 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.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/02—Contacts characterised by the material thereof
- H01H1/021—Composite material
Definitions
- This invention relates to contact stabilization materials; that is, materials that are used to stabilize or enhance current flow characteristics between contacting surfaces for electrical contact purpoces.
- the actual contacting surfaces are not perfectly smooth or continuously planar. Indeed, such contacting surfaces, if magnified sufficiently, may have the general appearance of a lunar landscape, or even that of a mountain range. In other words, the contacting surfaces, themselves, may be very rough, having a number of peaks and a number of pits or valleys.
- the actual electrical transmission i.e., the transmission of electrical current from one contact surface to the other — therefore occurs only at those places where there is real physical contact between the material of the one surface and the material of the other surface.
- Such electrical contacting surfaces are those that may be used in circumstances where relatively high current
- OMFI _ transfers between the contacting surfaces — relatively high being several milliamperes up to several amperes or more — as well as micropower installations where extremely low currents are expected to pass between contacting surfaces.
- high current applications may include plug-in communications and stand by power applications such as may be used by ground surface personnel when working with and communicating to personnel on board commercial jet aircraft and the like.
- Low power and micropower applications include low level video, radio frequency, audio frequency and computer circuitry and connections therefore.
- OMPI further material present such as previous materials that have been attempted to be used for the same purposes as the material of the present invention, there may be a chemical reaction between the contact 5 metal and a trapped gas film that may have developed due to the heat, and either the gas film or the chemical reaction may further cause anomalous behaviour of the near-contact boundry in the contact region.
- this discontinuous - behaviour at zero-crossing may lead to line reflections that may add artifacts to the signal.
- the zero-crossing discontinuity that may occur between contacting surfaces may show up as video ghosts or as imperfect chroma demodulation, due to apparent noise.
- zero-crossing or other contact-induced signal or data artifacts may appear as increased noise, and in certain circumstances there may be rectification artifacts — particularly in binary data flow conditions — where program crashes, incorrect data transmission, or spurious parity or cyclic redundancy error conditions may occur.
- a contact stablization material in order to be particularly effective, at micropower and higher power levels, and at frequencies ranging from DC to 500 mHz, must have the following properties, some of which may
- any effective contact stablization material must exhibit conductive effects when it is used between conductive surfaces such as metals, particularly as in metal-to-metal electrical contact applications.
- the material should not exhibit conductive properties when it is applied to insulators, such as the insulating material between the outer conductive shell and the inner conductive stud or wire used in co-axial radio frequency and video connectors, or the insulating material between adjacent data terminal strips for computer connectors.
- the contact stabilization material should be sufficiently liquid, or be capable of being carried in a liquid that is otherwise chemically inert, so that it may be readily and easily applied to the electrical contact surfaces. Alteratively, the material may be semi-liquid at room temperatures but liquid at higher working temperatures. Moreover, the contact stabilization material should have a sufficiently high surface tension that capillary action will cause the material to migrate between contacting electrical surfaces when they are connected together according to their usual application means, and at their working temperature.
- O PI material should have a sufficiently low vapour pressure _ so as to remain in place for the service life of the connector contact surfaces, even when the material is spread in very thin film thicknesses.
- a good contact stabilization material such as that which is contemplated by the present invention must ⁇ exhibit characteristics such that if the material catalyses or aids in any reaction within the material in the presenses of the metal of the contact surfaces, then the resultant catalysed or cross-linked material should also exhibit the same properties as those spoken herein. In other words, if cross linkage occurs or other reactions occur such that a cross-linked or longer molecule than exists, that cross-linked or longer molecule should be benign as to any adverse characteristics.
- any contact stabilization material When any contact stabilization material is used, it should have sufficient detergent action so that any embedded or coated continant that may be present on any contact surface, should be lifted or washed or wiped away when the contact stabilization material is applied. At the same time, the contact stabilization material must be such that it does not degrade the n ⁇ ln ⁇ O ⁇ O PC 84/04848
- the contact stabilization -_0 material should have low toxicity.
- the cost of the contact stabilization coating material for coating electrical contact surfaces should be sufficiently low that Its benefits are not more costly or expensive than the problems that
- contact stabilization coating materials for use with electrical contact surfaces by coating the same, are provided that comprise co-polymers or block polymers of polyoxypropylene together wth polyoxyethylene, or a plurality of block polymers of polyoxypropylene together with polyoxyethylene.
- Such materials especially when they have lower molecular weights, may be quite fluid and tend to "leak" or be runny. However, when cross-linking occurred, it- has been found that the longer molecular chains that then developed are still benign, and exhibit all the desired characteristics as discussed above.
- Block polymers of polyoxypropylene together with polyoxyethylene having molecular weights in the range of 1,000 to 3,000 were found to be most useful, and particularly those having a molecular weight in the range of 1,400 to 2,800.
- higher molecular weight block poylmers which may have a semi-liquid or waxy appearance at room temperatures, are quite suitable for use with elevated temperature surfaces, and show the necessary capillary action at those te pertures.
- the physical properties of the material therefore, can be altered as required; particularly as may be determined by the operating or ambient temperature of the contact surfaces.
- the block polymers are useful when the polyoxypropylene and polyoxyethylene were present in the range of 2% to 98%., by weight, of either of them, with the other component being present in the range of 98% to 2%, by weight; but more usually, each is present in the range of 20% to 80%, and vice-versa.
- the block polymers when first produced, have a distinctly yellow colouration, but the colouration may disappear or become quite reduced, in time.
- the contact stabilization material of . the present invention may comprise a plurality of block polymers of polyoxypropylene together with polyoxyethylene.
- the contact stabilization material according to this invention being a block polymer of polyoxypropylene and polyoxyethylene, or a plurality of block polymers, is such that the gaps between the surfaces of the _ contact surfaces act as if they were filled with a good electrical conductor; or in any event, that there is a discernible virtual conductivity between the contact surfaces, and therefore in the signal circuit.
- the film thickness effects exhibited by the contact stabilization material of the present invention are such that normal insulation gaps, however, as in co-axial connectors or computer edge card connectors, are not adversely affected.
- Frequency tests have been made, ranging from DC up to 500 mHz, and while there appeared to be some frequency dependency, various results were not consistent, and appeared in all events to be accounted for by variations in the connector/cable/test equipment performances.
- the contact stabilization materials of the present invention have been used in avionics applications, operating from minus 40 degrees C to plus 30 degrees C, without observable adverse effects.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Materials Engineering (AREA)
- Conductive Materials (AREA)
- Contacts (AREA)
- Organic Insulating Materials (AREA)
Abstract
Matériau de stabilisation de contact, comprenant un copolymère ou polymère bloc de polyoxypropylène avec du polyoxyéthylène, ou une pluralité de polymères blocs de polyoxypropylène avec du polyoxyéthylène. Le matériau de stabilisation de contact améliore l'écoulement du courant électrique entre les surfaces de contact, aussi bien dans les applications utilisant des courants élevés que dans les applications utilisant des courants faibles et à des fréquences allant du continu à des fréquences radio ultra-élevées, en améliorant la conductivité entre les surfaces de contact. Le matériau ne présente aucune tendance au "vernissage" pendant une période de temps donnée, et peut être catalysé par la présence de différents métaux sur les surfaces de contact.Contact stabilization material comprising a block copolymer or polymer of polyoxypropylene with polyoxyethylene, or a plurality of block polymers of polyoxypropylene with polyoxyethylene. The contact stabilizing material improves the flow of electric current between the contact surfaces, both in applications using high currents and in applications using low currents and at frequencies ranging from continuous to ultra-high radio frequencies , by improving the conductivity between the contact surfaces. The material shows no tendency to "varnish" for a given period of time, and can be catalyzed by the presence of different metals on the contact surfaces.
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA429145 | 1983-05-30 | ||
CA000429145A CA1217892A (en) | 1983-05-30 | 1983-05-30 | Contact stabilization coating material for electrical contact surfaces |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0144399A1 true EP0144399A1 (en) | 1985-06-19 |
Family
ID=4125346
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19840902287 Withdrawn EP0144399A1 (en) | 1983-05-30 | 1984-05-23 | Contact stabilization coating material for electrical contact surfaces |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0144399A1 (en) |
JP (1) | JPS60501482A (en) |
AU (1) | AU574690B2 (en) |
CA (1) | CA1217892A (en) |
WO (1) | WO1984004848A1 (en) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4359414A (en) * | 1972-12-22 | 1982-11-16 | E. I. Du Pont De Nemours And Company | Insulative composition for forming polymeric electric current regulating junctions |
JPS5913593B2 (en) * | 1976-05-21 | 1984-03-30 | 日本ペイント株式会社 | Pre-painting treatment method |
JPS5546799A (en) * | 1978-09-28 | 1980-04-02 | Tokyo Shibaura Electric Co | Voice generation system |
FR2485274A1 (en) * | 1980-03-31 | 1981-12-24 | France Etat | SOLID ELECTROLYTE BASED ON ION-CONDUCTION MACROMOLECULAR MATERIAL |
-
1983
- 1983-05-30 CA CA000429145A patent/CA1217892A/en not_active Expired
-
1984
- 1984-05-23 JP JP50214684A patent/JPS60501482A/en active Pending
- 1984-05-23 WO PCT/US1984/000783 patent/WO1984004848A1/en not_active Application Discontinuation
- 1984-05-23 AU AU30141/84A patent/AU574690B2/en not_active Ceased
- 1984-05-23 EP EP19840902287 patent/EP0144399A1/en not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO8404848A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO1984004848A1 (en) | 1984-12-06 |
AU3014184A (en) | 1984-12-18 |
CA1217892A (en) | 1987-02-10 |
AU574690B2 (en) | 1988-07-14 |
JPS60501482A (en) | 1985-09-05 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Designated state(s): AT BE CH DE FR GB LI LU NL SE |
|
17P | Request for examination filed |
Effective date: 19850607 |
|
R17P | Request for examination filed (corrected) |
Effective date: 19850801 |
|
R17P | Request for examination filed (corrected) |
Effective date: 19850607 |
|
17Q | First examination report despatched |
Effective date: 19860616 |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: D. W. ELECTROCHEMICALS LTD. |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19901002 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: WRIGHT, WILLIAM, MICHAEL, DAYTON |