ELECTRICAL INSULATION FROM BIAXIALLY ORIENTED PENBB FILM

摘要

Disclosed herein is a biaxially oriented copolyester film containing inert particles, wherein the copolyester is PENBB and wherein the inert particles are either generated in situ, added to the monomers before or during polycondensation or added to the PENBB before the film-forming process. Depending on the particular application, the film may have various thickness, may include pigment matter, and/or may be coated or surface treated. PENBB as mentioned herein is a copolyester containing units of formula (I).