| 摘要 |
<p>A process for producing a piezo- and pyro-electric film, which comprises biaxially stretching a single- or multi-layered thermoplastic film containing from 3 to 80% by volume, as an average based on the entire film, of a ferroelectric substance, then subjecting the stretched film to polarization treatment by applying a high voltage at a temperature within a range of from 10 DEG C. to a temperature lower than the melting point of said thermoplastic resin, and cooling the film while continuously applying the high voltage.</p> |
