Kureha Corporation

Keiko Aita

Yusuke Sato

Hisaaki Terashima

Nobufumi Sato

Kazuyuki Kanno

To provide a piezoelectric body film that can suppress decrease in the piezoelectric constant d, a method of producing a piezoelectric body film, and a piezoelectric body device. A piezoelectric body film comprising a fluororesin as a piezoelectric material, the fluororesin containing, as a main constituent unit, a repeating unit derived from vinylidene fluoride, a piezoelectric constant dof the piezoelectric body film being 20 pC/N or greater, and an extrapolated onset temperature at start of shrinkage determined by TMA measurement being not lower than 90° C. and not higher than 115° C. The difference between piezoelectric constants dmeasured before and after heating the piezoelectric body film at 100° C. for 24 hours relative to the piezoelectric constant dbefore the heating for 24 hours is 20% or less.

Piezoelectric body film, piezoelectric body film production method, and piezoelectric body device

To provide a piezoelectric body film that can suppress decrease in the piezoelectric constant d31, a method of producing a piezoelectric body film, and a piezoelectric body device. A piezoelectric body film comprising a fluororesin as a piezoelectric material, the fluororesin containing, as a main constituent unit, a repeating unit derived from vinylidene fluoride, a piezoelectric constant d31 of the piezoelectric body film being 20 pC/N or greater, and an extrapolated onset temperature at start of shrinkage determined by TMA measurement being not lower than 90° C. and not higher than 115° C. The difference between piezoelectric constants d31 measured before and after heating the piezoelectric body film at 100° C. for 24 hours relative to the piezoelectric constant d31 before the heating for 24 hours is 20% or less.

A vinylidene fluoride resin film is produced by using a film composition containing at least a vinylidene fluoride resin and organic particles. The vinylidene fluoride resin film includes a plurality of protrusions on at least one surface thereof. Among the plurality of protrusions, the number of protrusions greater than 0.10 &#x3bc;m in height from a flat surface at which the protrusions are not present is from 40 to 400, per 0.10 mmof the vinylidene fluoride resin film.

Vinylidene fluoride resin film

Provided is a vinylidene fluoride resin film that is produced using a film composition including at least a vinylidene fluoride resin and inorganic particles; and that includes a plurality of protrusions on at least one surface thereof. Among the plurality of protrusions, the number of protrusions greater than 0.10 &#x3bc;m in height from a flat surface at which the protrusions are not present is from 7.0 to 50 per 0.10 mmof the vinylidene fluoride resin film.

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Tokyo, Japan

Keiko Aita