Fibrous webs having enhanced electret properties
AssigneeMinnesota Mining and Manufacturing Company
InventorsAlan D. Rousseau, Marvin E. Jones, Seyed A. Angadjivand
Life of this patent
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Abstract
The present invention relates to a method of making a fibrous electret material which includes the steps of (1) forming a fibrous web of nonconductive thermoplastic fibers from a blend of nonconductive thermoplastic resin and an additive which is (a) a thermally stable organic compound or oligomer containing at least one perfluorinated moiety or (b) a thermally stable organic triazine compound or oligomer containing at least one nitrogen atom in addition to those in the triazine group or (c) a combination thereof; (2) impinging jets of water or a stream of water droplets onto the web at a pressure sufficient to provide the web with filtration enhancing electret charge; and (3) drying the web.
Claims18
A method of making a fibrous electret material comprising the steps of (1) impinging jets of water or a stream of water droplets onto a fibrous web at a pressure sufficient to provide the web with filtration enhancing electret charges the fibrous web comprising nonconductive thermoplastic fibers formed from a blend of nonconductive thermoplastic resin and an additive that is (a) a thermally stable organic compound or oligomer containing at least one perfluorinated moiety or (b) a thermally stable organic triazine compound or oligomer containing at least one nitrogen atom in addition to those in the triazine group or (c) a combination thereof;
- and (2) drying the web.
Dependencies are inferred from the claim text.