ENERGY-CONVERSION FILM AND PRODUCTION METHOD THEREFOR, AND PRODUCTION METHOD FOR ENERGY-CONVERSION ELEMENT

WIPO Patent Application WO/2021/024868

A1

Provided is a method for producing an energy-conversion film that exhibits no variation in in-plane piezoelectric performance and has excellent uniformity in in-plane piezoelectric performance. This method for producing an energy-conversion film, which is a porous resin film, comprises: a kneading step for kneading a resin composition that contains a thermoplastic resin and a pore-forming agent, and then extruding the obtained kneaded product; an extrusion step for forming a non-stretched resin film by extruding the kneaded product into a film shape; and a stretching step for stretching the non-stretched resin film at least in one axial direction, wherein the kneading step and/or the extrusion step further comprises a step for filtering the kneaded product using a filtration filter having a filtration grain size of 40-300 μm, the stretching step includes a stress-relaxation treatment in which the degree of stretch of the resin film in the stretching axial direction is relaxed in mid-course of the stretching step, and the result of calculation of formula (1): (B-A)/A falls between -10.0% and -0.1%, where A represents the maximum value of the degree of stretch when the resin film is stretched in the stretching axial direction, and B represents the value of the degree of stretch at the time when the degree of stretch is lowered by the stress relaxation treatment.

KOIKE HIROSHI (JP)
SUGAMATA YUTARO (JP)
IIDA SEIICHIRO (JP)

PCT/JP2020/028953

February 11, 2021

July 29, 2020

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YUPO CORP (JP)

H01G7/02; B29C67/20; H01L41/45

WO2010001634A1

2010-01-07

JP2017055114A	2017-03-16
JP2006192889A	2006-07-27
JP2015111641A	2015-06-18

TAKAOKA Ryoichi et al. (JP)

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