Abstract: A floor heating bendable, electrically conductive, thermoplastic mat having at least two electrodes arranged along each side edge of the mat. The mat includes a material composition whose volume resistivity increases substantially with an increase of temperature of the material composition below 30° C. The material composition comprises a semicrystalline polymer and an electrically conductive filler material. The polymer has a crystalline melting point which exceeds a normal working temperature of the mat but is below 99° C. and whose softening temperature (Vicat) is in a range of 45-70° C. The mat is self regulating regarding temperature and power for floor heating.
Type:
Grant
Filed:
October 18, 2002
Date of Patent:
May 18, 2004
Assignee:
Polyohm AB
Inventors:
Ulf Ek, Claes-Goran Gustafsson, Kai Kangassalo