H - Electricity – 05 – B
Patent
H - Electricity
05
B
309/85
H05B 1/00 (2006.01) H01C 7/02 (2006.01) H05B 3/14 (2006.01)
Patent
CA 1106890
ABSTRACT The invention relates to electrical devices comprising an electrode and a conductive polymer composition, preferably a PTC com- position, in contact with the electrode. The process of the invention comprises contacting the com- position and the electrode while the composition is at a temperature (Tp) above its melting point (Tm) and the electrode is at a tempera- ture (Te) above the melting point of the composition, Tp and Te being the same or different, for a time which is sufficient to reduce the contact resistance between the electrode and the composition but which is not sufficient substantially to reduce the resistivity of the composition, for example, 2 time less than 5 minutes. Preferably both Tp and Te are at least 20°C, especially at least 55°C, above Tm. In a preferred process the composition is melt-extruded over one of more pre-heated electrodes. It has been found that the process of the invention substantially reduces the tendency of the resistance of the device to increase when the device is subject to thermal cycling. The invention is particularly useful in connection with self-regulating heaters, especially strip heaters comprising a pair of stranded wire electrodes embedded in an elongate core of a PTC material comprising carbon black dispersed in a crystalline polymer.
292832
Kamath Hundi P.
Leder Jeffrey C.
Fetherstonhaugh & Co.
Raychem Corporation
LandOfFree
Electrical devices comprising conductive polymer compositions does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electrical devices comprising conductive polymer compositions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electrical devices comprising conductive polymer compositions will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-452043