Continuous manufacturing methods for positive temperature coefficient materials
US5814264A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 12, 1996 |
| Grant date | Sep 29, 1998 |
| Priority date | — |
| Expiry date | Apr 12, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB32B37/153
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method for producing a conductive polymeric composition exhibiting PTC behavior. The method includes the steps of: providing a quantity of polymer component having a melting point temperature T.sub.mp, and a quantity of conductive filler component; mixing the quantity of polymer component and the quantity of conductive filler component in a receiving unit at a temperature greater than T.sub.mp to form a molten mixture; forcing the molten mixture from the receiving unit to form an element having an electrical resistivity; measuring the electrical resistivity of the element; comparing the measured electrical resistivity of the element to a predetermined electrical resistivity value; and, adjusting the quantity of conductive filler component relative to the quantity of polymer component based on the comparison between the measured electrical resistivity of the element and the predetermined electrical resistivity value to achieve a desired element having an electrical resistivity approximately equal to the predetermined electrical resistivity value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.