High-Temperature Metallized Polymer Film Capacitors Based on Blends of Polypropylene and Cyclic Olefin Copolymers

This paper presents the test results obtained by TDK on newly developed metallized polymer film capacitors based on 80/20 blends of polypropylene and a cyclic olefin copolymer with a glass transition temperature of 140°C. Polypropylene-based capacitors have been used as reference. Both showing similar frequency characteristics, the blend capacitors present a considerably lower leakage current and perform gracefully by self-healing during DC endurance tests at temperatures of 120°C and above.