CELLULAR RESIN SHEET FOR PIEZOELECTRIC ELEMENT AND PROCESS FOR PRODUCING SAME

摘要

[Problem] To provide a cellular resin sheet for piezoelectric elements which is capable of retaining high piezoelectric properties in a wide use temperature range over a long period and which is excellent in terms of environmental resistance and heat resistance and a process for producing the cellular resin sheet. [Solution] This cellular resin sheet for piezoelectric elements is characterized by comprising a matrix resin and at least charge-inducing hollow particles dispersed therein, the charge-inducing hollow particles comprising hollow particles and a conductive substance adherent to at least some of the surfaces of the hollow particles, and the conductive substance having a higher conductivity than the hollow particles and the matrix resin.