POROUS RESIN SHEET FOR PIEZOELECTRIC/PYROELECTRIC ELEMENT, AND PROCESS FOR PRODUCTION THEREOF

摘要

PROBLEM TO BE SOLVED: To provide a porous resin sheet for a piezoelectric/pyroelectric element which has a high piezoelectric modulus and a high compressive stress and also has excellent heat resistance, and to provide a process for producing the porous resin sheet.SOLUTION: The porous resin sheet for the piezoelectric/pyroelectric element contains air bubbles having an average maximum vertical chord length of 1 to 40 μm and an average aspect ratio [(average maximum horizontal chord length)/(average maximum vertical chord length)] of 0.7 to 4.0 and has a volume porosity of 20 to 75%.