FLAME RETARDANT SOFT MAGNETIC SHEET

摘要

A flame retardant soft magnetic sheet comprising at least flat soft magnetic powder and a polyester resin. The polyester resin is a polyester resin with phosphorus internally added thereto. The polyester resin with phosphorus internally added thereto has a phosphate residue in each molecule. Preferably, the phosphorus content of the polyester resin with phosphorus internally added thereto is = 3.0 wt.%. As a result, the flame retardant soft magnetic sheet exhibits satisfactory flame retardancy without the use of a halogenated flame retardant as a flame retarder and can reduce any deterioration of magnetic properties after environmental test.