Patent ID: 11969929
Assignee: CELGARD, LLC
Field: Chemical engineering (Chemistry)
Classification: CPC B  H  D  Y | IPC B  D  H

Claim 7:
8. A multilayer microporous membrane or film comprising:
two outermost sub-membranes comprising three or more nano-layers (thickness less than 1 micron) or micro-layers (thickness between 1 and 10 microns); and
at least one inner sub-membrane comprising three or more nano-layers (thickness less than 1 micron) or micro-layers (thickness between 1 and 10 microns) that comprise, consist of, or consist essentially of polypropylene,
wherein in at least one of the outermost sub-membranes, the outermost micro-layer or nano-layer comprises, consists of, or consists essentially of polyethylene.