Stable positively charged electrets

Details Stable positively charged electrets Stable positively charged electrets

H - Electricity

01

G

349/69, 204/96.2

H01G 7/02 (2006.01)

Patent

CA 1176597

STABLE POSITIVELY CHARGED ELECTRETS Abstract of the Disclosure A method of producing charged Teflon material having a stable internal positive charge is shown. Partially penetrating positive ions, which may be produced, for example, by a corona discharge or ion beam, are applied to Teflon at an elevated temperature, typically in excess of 100 degrees Celsius for high stability. It has been found that stable internal positive charges may be obtained thereby, having a stability at room temperature in excess of 2,000 years in some cases. This is comparable to the charge stability of negatively internally charged Teflon articles. Regions of both positive and negative internal charges may be included in the same article. Various charged Teflon devices may be made, including microphones, loudspeakers, electrostatic air filters, etc. Intermediate levels of charge stability, less than the maximum obtainable, may also be produced.

404046

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