Electrets

Details Electrets Electrets

Category

C - Chemistry, Metallurgy

Subcategory

08

Subsubcategory

F

CPC

204/96.17

IPC codes

C08F 2/52 (2006.01) C08J 3/28 (2006.01) H01G 7/02 (2006.01)

Type

Patent

Patent number

CA 1146908

Description

12,426 ELECTRETS ABSTRACT OF THE DISCLOSURE A process for preparing polymer electrets com- prising the following steps: (a) providing a parylene film having one side affixed to a metal layer and grounding said metal layer; (b) charging the free side of the film with a direct current corona, the charge being of sufficient magnitude to convert the film to an electret; (c) providing p-xylylene monomer vapor in suffi- cient amount to coat the charged film; and (d) introducing the vapor from step (c) and the electret into a deposition zone, said zone being under vacuum and at a temperature at which the vapor will condense, where- by the electret is conformally coated with parylene. SPECIFICATION

Application Number

359571

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