US 12,453,942 B2
Porous poly (cyclic olefin) membranes
Sina Bonyadi, Billerica, MA (US); Pushkara Rao Varanasi, Poughkeepsie, NY (US); Zhifeng Li, Acton, MA (US); Carrie Lynn Frazee, Bedford, MA (US); Larry F. Rhodes, Akron, OH (US); and Leah Langsdorf, Akron, OH (US)
Assigned to ENTEGRIS, INC., Billerica, MA (US); and PROMERUS, LLC, Akron, OH (US)
Filed by ENTEGRIS, INC., Billerica, MA (US); and PROMERUS, LLC, Akron, OH (US)
Filed on May 6, 2022, as Appl. No. 17/738,518.
Claims priority of provisional application 63/185,855, filed on May 7, 2021.
Prior Publication US 2022/0362720 A1, Nov. 17, 2022
Int. Cl. B01D 71/44 (2006.01); B01D 67/00 (2006.01); B01D 69/02 (2006.01)
CPC B01D 71/44 (2013.01) [B01D 67/0013 (2013.01); B01D 69/02 (2013.01); B01D 2325/02 (2013.01); B01D 2325/04 (2013.01)] 12 Claims
 
1. A porous membrane comprising:
a poly (cyclic olefin) copolymer according to:

OG Complex Work Unit Chemistry
wherein n and m represent the number of repeat units of each type, p is 0 or 1, and R is chosen from:
(i) a C1-C10 alkyl group; and
(ii) a C1-C10 alkyl group substituted one to three times with a group chosen from halo, nitro, C1-C4 alkoxy, cyano, amine, sulfonamide, sulfonic acid, trifluoromethanesulfonamido, phosphonic acid, carboxyl, hydroxyl, and salts thereof;
the porous membrane having a thickness of about 40 μm to about 300 μm and a mean pore size of about 10 nm to about 100 nm, and
wherein the porous membrane exhibits an isopropanol flow time in a range from about 200 seconds/500 ml to about 50,000 seconds/500 ml when measured at 14.2 psi and at a temperature of about 21° C.