US 12,083,482 B2
Lightweight expanded polytetrafluoroethylene membranes having high instrinsic strength and optical transparency
Bryan Hutchinson, Newark, DE (US); Justin J. Skaife, Newark, DE (US); and Bret Snyder, Newark, DE (US)
Assigned to W. L. Gore & Associates, Inc., Newark, DE (US)
Appl. No. 17/596,499
Filed by W. L. Gore & Associates, Inc., Newark, DE (US)
PCT Filed Jun. 9, 2020, PCT No. PCT/US2020/036725
§ 371(c)(1), (2) Date Dec. 10, 2021,
PCT Pub. No. WO2020/251909, PCT Pub. Date Dec. 17, 2020.
Claims priority of provisional application 62/861,157, filed on Jun. 13, 2019.
Prior Publication US 2023/0081107 A1, Mar. 16, 2023
Int. Cl. B01D 69/02 (2006.01); B01D 67/00 (2006.01); B01D 71/36 (2006.01)
CPC B01D 69/02 (2013.01) [B01D 67/0027 (2013.01); B01D 71/36 (2013.01); B01D 2325/24 (2013.01)] 26 Claims
OG exemplary drawing
 
1. An expanded polytetrafluoroethylene (ePTFE) membrane comprising:
a matrix tensile strength at least about 600 MPa in both longitudinal and transverse directions; and
a crystallinity index of at least about 94%.