US 11,654,403 B2
Porous fluorine-based resin composite membrane and manufacturing method therefor
Sin Woo Kim, Daejeon (KR); Seijung Park, Daejeon (KR); Byeong In Ahn, Daejeon (KR); and Hyun Seong Ko, Daejeon (KR)
Assigned to LG CHEM, LTD., Seoul (KR)
Appl. No. 17/44,745
Filed by LG CHEM, LTD., Seoul (KR)
PCT Filed Jul. 9, 2019, PCT No. PCT/KR2019/008432
§ 371(c)(1), (2) Date Oct. 1, 2020,
PCT Pub. No. WO2020/013578, PCT Pub. Date Jan. 16, 2020.
Claims priority of application No. 10-2018-0081250 (KR), filed on Jul. 12, 2018.
Prior Publication US 2021/0023509 A1, Jan. 28, 2021
Int. Cl. B01D 71/32 (2006.01); B01D 67/00 (2006.01); B01D 69/02 (2006.01); B01D 69/12 (2006.01)
CPC B01D 71/32 (2013.01) [B01D 67/0093 (2013.01); B01D 69/02 (2013.01); B01D 69/12 (2013.01); B01D 2325/02 (2013.01); B01D 2325/04 (2013.01); B01D 2325/38 (2013.01)] 8 Claims
 
1. A method for producing a porous fluorine-based resin composite membrane comprising the steps of:
providing a porous fluorine-based resin layer having pores therein,
preparing a coating solution including a (co)polymer containing a repeating unit derived from a perfluoroalkyl acrylate having 1 to 10 carbon atoms and a perfluoroalkanoic acid having 3 to 10 carbon atoms,
coating the coating solution onto at least one surface of the porous fluorine-based resin layer and an outer surface of the pores to produce a coating layer, and
decomposing the perfluoroalkanoic acid having 3 to 10 carbon atoms from the coating layer.