초록 ▼

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 tre

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°C. to a temperature lower than the melting point of said thermoplastic resin, and cooling the film while continuously applying the high voltage.

대표청구항 ▼

A process for producing a piezo- and pyro-electric film having high strength and without great anisotrophy in the Piezo-electric characteristics, 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 f

A process for producing a piezo- and pyro-electric film having high strength and without great anisotrophy in the Piezo-electric characteristics, 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 such that during the biaxial stretching, particles of the ferroelectric substance are subjected to the shearing stress resulting from molecular chain orientation of the thermoplastic resin of the film and undergo a change in their state from a randomly dispersed state in the non-stretched film to an oriented state as stretched, then subjecting the stretched film to polarization by applying a high voltage at a temperature within a range of from 10°C. to a temperature lower than the melting point of said thermoplastic resin, and cooling the film while continuously applying the high voltage.