SURFACE ROUGHENED BIAXIALLY ORIENTED POLYPROPYLENE COMPOSITE FILM AND CAPACITOR MADE THEREOF

摘要

PURPOSE:To provide biaxially oritented polypropylene composite film for capacitor, the surface of which is uniformly roughened and which has few evils to electrical characteristics such as voids and the like. CONSTITUTION:In the composite film concerned, at least onto one side of film mainly made of polypropylene film mainly made of syndiotactic polypropylene film is compounded under the condition that the film to be compounded is biaxially oriented so as to have the center-line surface roughness of 5mum or more.