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

Claim 15:
16. A multilayer microporous membrane comprising:
two outermost sub-membranes comprising two outermost nano-layers (less than 1 micron thickness) or micro-layers (between 1 and 10 micron thickness) and at least one inner nano-layer or micro-layer, wherein the outermost nano-layers or micro-layers of the two outermost sub-membranes comprise, consist of, or consist essentially of polyethylene and the at least one inner nano-layer or micro-layer of the two outermost sub-membranes comprises, consists of, or consists essentially of polypropylene, including a high molecular weight polypropylene; and
at least one inner sub-membrane comprising two outermost nano-layers or micro-layers and at least one inner nano-layer or micro-layer, wherein the two outermost nano-layers or micro-layers of the at least one inner sub-membrane comprise, consist of, or consist essentially of polyethylene, and the at least one inner nano-layer or micro-layer of the at least one inner sub-membrane comprises, consists of, or consists essentially of polypropylene, including a high molecular weight polypropylene.