US 11,717,793 B2
Functional fibrous membrane, method for manufacturing the same, filter comprising the same
Siu Wah Wong, Hong Kong (CN); Ho Wang Tong, Shatin (CN); Yu-Jen Chiang, Shatin (CN); Chun Yin Karl Yip, Shatin (CN); Arthur Hong-kin Kwong, Shatin (CN); Huajia Diao, Shatin (CN); Yinghua Zhang, Shatin (CN); Yu Hang Leung, Shatin (CN); and Connie Sau Kuen Kwok, Shatin (CN)
Assigned to KING'S FLAIR DEVELOPMENT LTD., Hong Kong (CN)
Appl. No. 16/978,515
Filed by KING'S FLAIR DEVELOPMENT LTD., Hong Kong (CN)
PCT Filed Mar. 7, 2019, PCT No. PCT/IB2019/051837
§ 371(c)(1), (2) Date Sep. 4, 2020,
PCT Pub. No. WO2019/171311, PCT Pub. Date Sep. 12, 2019.
Claims priority of provisional application 62/639,605, filed on Mar. 7, 2018.
Prior Publication US 2020/0398230 A1, Dec. 24, 2020
Int. Cl. B01D 71/82 (2006.01); B01D 63/06 (2006.01); B01D 67/00 (2006.01); B01D 69/02 (2006.01); B01D 69/12 (2006.01); B01D 71/40 (2006.01)
CPC B01D 71/82 (2013.01) [B01D 63/067 (2013.01); B01D 67/002 (2013.01); B01D 67/0004 (2013.01); B01D 67/0093 (2013.01); B01D 69/02 (2013.01); B01D 69/12 (2013.01); B01D 71/40 (2013.01); B01D 2313/40 (2013.01); B01D 2313/44 (2013.01); B01D 2323/36 (2013.01); B01D 2323/39 (2013.01); B01D 2325/022 (2013.01); B01D 2325/14 (2013.01); B01D 2325/16 (2013.01)] 24 Claims
OG exemplary drawing
 
1. A fibrous membrane comprising:
at least one single substrate layer comprising at least 80% by weight of microfibers, said single substrate layer carrying both positively charged and negatively charged functional groups, and
at least one layer of filtration material attached to the substrate layer, wherein the layer of filtration material comprises at least 80% by weight of nanofibers wherein said nanofibers are amine-based polymer selected from polyacrylonitrile (PAN) or chitosan, and are functionalized to carry negatively charged and positively charged functional groups within the layer of filtration material after said polymer reacting, respectively, with an alkylating agent and quaternary ammonium compound.