Piezoelectric and pyroelectric film and method for preparing the

Details Piezoelectric and pyroelectric film and method for preparing the Piezoelectric and pyroelectric film and method for preparing the

1979-11-19

1981-09-22

Lowe, James B.

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

2642888, 2642902, B29C 1702

Patent

active

042909830

ABSTRACT:
A piezoelectric and pyroelectric film made from a resin composition of polymer of vinylidene fluoride, which is characterized by an index of birefringence of larger than 3.times.10.sup.-3 and a ratio of d.sub.31 /d.sub.32 of 0.3 to 3.0, and which may be prepared by further stretching a biaxially stretched film made from the above-mentioned resin composition at a temperature lower than the temperature of the biaxially stretching by more than 20.degree. C. before or at the same time of a treatment for orientation polarization of the film.

REFERENCES:
patent: 3197538 (1965-07-01), Capron et al.
patent: 3691264 (1972-09-01), Asahina
patent: 3869534 (1975-03-01), Yoshikawa et al.
patent: 3878274 (1975-04-01), Murayama et al.
patent: 3931446 (1976-01-01), Murayama et al.
patent: 4049859 (1977-09-01), Yoshikawa et al.
patent: 4127681 (1978-11-01), Ferren et al.
patent: 4134957 (1979-01-01), Yoshimura et al.

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