Process for producing a piezo- and pyro-electric film
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United States of America Patent
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Jun 3, 1986
Grant Date -
N/A
app pub date -
Jul 3, 1984
filing date -
Jul 7, 1983
priority date (Note) -
Expired
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Abstract
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.degree. C. to a temperature lower than the melting point of said thermoplastic resin, and cooling the film while continuously applying the high voltage.
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