Electrically resistive PTC devices containing conductive polymers
US6570483B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 13, 1997 |
| Grant date | May 27, 2003 |
| Priority date | — |
| Expiry date | Mar 13, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01C1/1406
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electrical resistive device in which an element composed of a conductive polymer is positioned in contact with the surface layer of one or more metal electrodes. The metal electrode contains a base layer which includes a first metal, an intermediate metal layer which includes a metal that is different from the first metal, and a surface layer which (i) includes a second metal, (ii) has a center line average roughness {overscore (Ra)} of at least 1.3, and (iii) has a reflection density Rd of at least 0.60. The conductive polymer composition preferably exhibits PTC behavior density requirements, which may be, for example, circuit protection devices or heaters, have improved thermal and electrical performance over devices prepared with electrodes which do not meet the center line average roughness and reflection density requirements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.