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 |
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.
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