PTC conductive polymer composition containing carbon black having large particle size and high DBP absorption
US5174924A · kind A · utility
64Cited by
35References
46Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 4, 1990 |
| Grant date | Dec 29, 1992 |
| Priority date | — |
| Expiry date | Jun 4, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01C7/027
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A conductive polymer composition exhibiting positive temperature coefficient behavior comprising: PA1 (a) a crystalline polymer having dispersed therein PA1 (b) carbon black having an average particle diameter of at least about 60 millimicrons and a DBP absorption of at least about 80 cc/100 g. Circuit protection devices containing a thin layer of this conductive polymer composition between laminar electrodes provide high breakdown voltage in combination with very low resistance and are useful for protecting high-current/high voltage battery-powered devices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.