Electrets and the manufacture thereof

Details Electrets and the manufacture thereof Electrets and the manufacture thereof

H - Electricity

01

G

356/200, 349/69

H01G 7/02 (2006.01)

Patent

CA 1217577

ABSTRACT OF THE DISCLOSURE A method for producing stable, layered electrets includes the steps of placing a thin sheet of glassy polymer or copolymer of high molecular weight, such as polyethylene terephthalate, between two, somewhat larger in plan form, sheets of polyvinyl chloride and/or polyvinyl acetate formu- lation, to form a sandwich structure which is then compressed and heated to approximately 300°F. At this temperature the exterior polyvinyl chloride or copolymer sheets are polarized and displaced under pressure over the interior sheet to charge the interfaces of the exterior and interior sheets. The heat, furthermore, bonds the peripheral edges of the larger exterior sheets to each other thus forming a hermetically closed container within which the charged interfaces will reside. Alternatively, two or more sheets of electret (polymer) material may be pressed and heated against each other to a point where plastic deformation occurs but below melting. At this point surface charges on each sheet induce internal charges or polarization which is then fixed by rapid cooling.

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