MATERIAL FOR HEAT-RESISTANT ELECTRET AND HEAT-RESISTANT ELECTRET

摘要

A material for a heat-resistant electret containing a fluororesin, wherein the fluororesin is a modified polyterafluoroethylene; an electret manufactured by the use of the material; and an electret having a metal member and, adhered to the surface thereof, a resin film, wherein the resin film comprises a polyterafluoroethylene and only one surface of the metal member's side of the resin film has been subjected to a treatment for improving adhesiveness. The electrets have high performance capability for the retention of electric charge at a high temperature and thus exhibit high heat resistance.