To provide an electret having high stability with time and thermal stability of retained electric charge and having excellent charge retention performance, and an electrostatic induction conversion device comprising such an electret. This has been done by providing an electret obtained from a composition...http://www.google.fr/patents/US8129869?utm_source=gb-gplus-shareBrevet US8129869 - Electret and electrostatic induction conversion device
Electret and electrostatic induction conversion device
