Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1994-01-27
1996-04-23
Michl, Paul R.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524514, 525183, 525184, 439271, C08K 520, C08F 830, H01R 1352
Patent
active
055104053
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND
1. Field of the Invention
This invention relates generally to electrically connectors, and more particularly to a plug connection for electrically conductive cables and to its production.
2. Discussion of Related Art
Plug connections of the type in question are known. For example, a waterproof plug connection containing Macromelt.RTM. hotmelt adhesives is described in Henkel KGaA's technical information pamphlet "Macromelt.RTM. Hotmelt" published in Mar., 1990. This connection meets the stringent requirements of the automotive industry. In contrast to air-conditioned atmospheres, extreme conditions for electronic components prevail in motor vehicles and particularly in engine compartments. Heat, frost, dust, oil and, in particular, spray are the factors which affect electronic components and their connecting elements. If autoelectronics are to operate efficiently, optimal protection is essential. The problem presented by the penetration of moisture into plug connections and cable harnesses was solved by the use of Macromelt.RTM.. Macromelt.RTM. not only forms a 100% seal against moisture, it also has a high heat resistance of more than 90.degree. to >150.degree. C. (depending on the type of material), excellent low temperature compatibility of more than -30.degree. C. and very good adhesion to various connector housings. The pamphlet also describes the production of a waterproof connector from the hotmelt adhesive Macromelt.RTM., a cable with contact pins and a pin bushing by means of a hotmelt applicator and a volume met.RTM.ring head with exact volume dosing by pouring in the hotmelt adhesive. The hotmelts mentioned have a viscosity of 2,500 to 3,200 mPa.s at 210.degree. C.
SUMMARY OF THE INVENTION
The invention seeks to provide plug connections for electrically conductive cables which are easy to make, but which nevertheless function reliably in adverse conditions, such as dust, moisture, vibration and wide temperature variations in use and exposure to high temperatures during further processing. In one embodiment of the invention, the plug connection contains a hotmelt adhesive having a viscosity of more than 8,000 mPa.s at 200.degree. C. The viscosity of the hotmelt is preferably in the range from 12,000 to 60,000 mPa.s at 200.degree. C., as measured with a Brookfield Thermocel viscosimeter of the RVT type, spindle 27. The best results are obtained with a viscosity of 20,000 to 35,000 mPa.s. With increasing melt viscosity, above 80,000, the void is no longer reproducibly filled and pressure tightness cannot be guaranteed.
In the context of the invention, a cable is understood to be a well-insulated electrical line provided with protective sheaths. Plug connections, i.e. connectors and pin bushings or couplings, are used to extend cables and to connect them to electrical devices. The connector is that part of the plug connection which is provided with contact pins while the pin bushing or coupling is that part which is provided with contact bushings. The connection is established by pushing the contact pin into the contact bushing.
The invention is particularly suitable for the production of plug connections for coaxial cables, more particularly for wide band cable joint boxes. Coaxial cables consist of an inner conductor, for example of copper or aluminium, which is held exactly centrally in the outer conductor, for example of copper, aluminium, brass, etc., by disks, walls or an insulating material with a low dielectric loss factor, for example polystyrene or ceramic. The diameter ratio of the inner conductor to the outer conductor critically determines the characteristic impedance, an important parameter of coaxial cables. The conditions inside the cable, particularly the central arrangement, should remain intact, even during the connection of the cable. The use of a hotmelt adhesive in accordance with the invention is particularly suitable for this purpose, the hotmelt completely filling the space between the inner conductor and the outer conductor and between the outer bushing an
REFERENCES:
patent: 4791164 (1988-12-01), Wichelhaus et al.
patent: 5006286 (1991-04-01), Dery et al.
Technical Information Pamphlet "Macromelt.RTM. Hotmelt" published Mar. 1990 Adhasion (1969) Heft 1.
Becker Bettina
Heucher Reimar
Schueller Kurt
Wichelhaus Juergen
DeWitt LaVonda R.
Henkel Kommanditgesellschaft auf Aktien
Jaeschke Wayne C.
Michl Paul R.
Szoke Ernest G.
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