Fibrous webs having enhanced electret properties

Details Fibrous webs having enhanced electret properties Fibrous webs having enhanced electret properties

C - Chemistry, Metallurgy

07

D

C07D 487/04 (2006.01) B01D 39/08 (2006.01) B01D 39/16 (2006.01) B03C 3/28 (2006.01) C07D 209/48 (2006.01) C07D 251/70 (2006.01) C08K 5/3417 (2006.01) D01F 1/10 (2006.01) D04H 1/42 (2006.01)

Patent

CA 2227422

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.

La présente invention concerne un procédé de fabrication d'un matériau fibreux pour électret, lequel procédé consiste à (1) former un voile fibreux de fibres thermoplastiques non conductrices à partir d'un mélange de résine thermoplastique non conductrice et d'un additif. Cet additif peut être (a) soit un composé ou un oligomère organique stable sur le plan thermique et contenant au moins un fragment perfluoré, (b) soit un composé ou un oligomère de triazine organique stable sur le plan thermique et contenant au moins un atome d'azote outre de ceux du groupe triazine, (c) soit encore une combinaison de ces deux éléments. On envoie (2) ensuite des jets d'eau ou des flux de gouttelettes d'eau sur le voile à une pression suffisante pour lui conférer une charge d'électret permettant d'accroître la filtration, ledit voile étant ensuite séché (3).

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