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1. (WO2018005965) MULTI-LAYERED ELECTRET-CONTAINING FILTRATION MEDIA

Pub. No.:    WO/2018/005965    International Application No.:    PCT/US2017/040287
Publication Date: Fri Jan 05 00:59:59 CET 2018 International Filing Date: Sat Jul 01 01:59:59 CEST 2017
IPC: B01D 39/18
Applicants: HOLLINGSWORTH & VOSE COMPANY
Inventors: ZHU, Siqiang
GALLIMORE, Mark A.
COX, Stephen T.
Title: MULTI-LAYERED ELECTRET-CONTAINING FILTRATION MEDIA
Abstract:
Filter media for filtering gas streams (e.g., air) are described herein. In some embodiments, the filter media may be designed to have desirable properties such as stable filtration efficiency, high oil repellency, low instantaneous resistance, and/or stable service life. One or more layers of the media may have a certain value of thickness over instantaneous resistance (and/or a ratio of thickness over instantaneous resistance between two layers). The filter media described herein may be particularly well-suited for applications that involve filtering gas streams (e.g., face masks, cabin air filtration, vacuum filtration, respirator equipment), though the media may also be used in other applications.