Polymer composition having positive temperature coefficient characteristics
US4732701A · kind A · utility
27Cited by
8References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 24, 1986 |
| Grant date | Mar 22, 1988 |
| Priority date | — |
| Expiry date | Nov 24, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01C7/027
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A polymer composition having positive temperature coefficient characteristics is described, comprising 100 parts by weight of a mixture consisting of from 40 to 90% by weight of a crystalline polymer and from 60 to 10% by weight of an electrically conductive powder and from 10 to 300 parts by weight of a semiconductive inorganic substance. This polymer composition can withstand high voltage and when used as a heat generator, produces a uniform distribution of heat and has a long service life. Thus the polymer composition is useful for production of an overcurrent protecting element and a heat generator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.