US 11,701,623 B2
Method of forming a laminated single layer composite membrane
Dongzhu Wu, Somerville, MA (US); Kwok Shun Cheng, Nashua, NH (US); Rajnikant B. Patel, Tewksbury, MA (US); Tony Yu, Quincy, MA (US); Puth Proeung, Lowell, MA (US); and Maybelle Woo, Dedham, MA (US)
Assigned to ENTEGRIS, INC., Billerica, MA (US)
Filed by ENTEGRIS, INC., Billerica, MA (US)
Filed on May 14, 2021, as Appl. No. 17/320,973.
Claims priority of provisional application 63/025,660, filed on May 15, 2020.
Prior Publication US 2021/0354092 A1, Nov. 18, 2021
Int. Cl. B01D 67/00 (2006.01); B01D 69/02 (2006.01); B01D 69/12 (2006.01); B01D 71/26 (2006.01)
CPC B01D 69/122 (2013.01) [B01D 67/0002 (2013.01); B01D 69/02 (2013.01); B01D 71/26 (2013.01); B01D 2323/08 (2013.01); B01D 2325/04 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A composite membrane comprising:
a first porous polymeric layer having a first bubble point; and
a second porous polymeric layer having a second bubble point and laminated with the first porous polymeric layer,
wherein the composite membrane is free of an adhesive, the first bubble point is greater than the second bubble point, and the composite membrane has a bubble point that is greater than or equal to 90% of the first bubble point of the first porous polymeric layer.