Sumitomo Bakelite Company Limited

Tomomi Yanagida

Shigeru Suzuki

Toshimitsu Fukase

Mitunori Ajiki

Kisaku Nakagawa

Hiroshi Tokuta

The invention provides a process for producing a piezo-electric or pyro-electric composite sheet in which particles of a piezo-electric or pyro-electric sintered body (ceramics) are dispersed in the form of a single layer in an insulating high polymeric substance, and the particles are in direct contact with electrodes made on both sides of the sheet. The composite sheet is produced by forming a sheet of an insulating high polymeric substance having dispersed therein particles of a piezo-electric or pyro-electric sintered body (ceramics) in the form of a single layer, then removing the surface skin from both sides of the sheet to expose the particles from both sides of the sheet; and making electrodes on both sides of the sheet and implying a voltage difference thereto to effect poling of the sheet.

Process for producing piezo-electric or pyro-electric composite sheet

A metal-clad laminate comprising a base plate composed of a plurality of electrically insulating material layers and a metal foil or foils laminated on one side or both sides of the base plate, characterized in that to at least the metal foil or foils is laminated an electrically insulating material layer composed of a silane-modified polyethylene resin sheet, that to the silane-modified polyethylene resin is laminated an electrically insulating material layer made of a paper or cloth containing an epoxy resin and/or a silanol condensation catalyst, and that the layer made of a paper or cloth contains 5 to 35% by weight of an epoxy resin and/or that to the layer made of a paper or cloth is laminated an electrically insulating material layer other than the above-mentioned two layers. Said metal-clad laminate has excellent characteristics such as low, .epsilon., low tan .delta. and excellent moisture-resistant insulating property.

Growing community of inventors

Fujieda, Japan

Tomomi Yanagida