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

Claim 4:
5. A multilayer microporous membrane or film having or exhibiting at least one of following:
(a) having at least one additive in at least one layer of the multilayer microporous membrane or film;
(b) having or exhibiting increased or improved compressibility compared to a tri-layer microporous membrane having the same thickness, Gurley, porosity, and/or resin make-up as the multilayer microporous membrane or film;
(c) having or exhibiting increased or improved elongation at break (TD) compared to a tri-layer microporous membrane having the same thickness, Gurley, porosity, and/or resin make-up as the multilayer microporous membrane or film:
(d) having or exhibiting reduced high temperature shrinkage at 150° C. compared to a tri-layer microporous membrane having the same thickness, Gurley, porosity, and/or resin make-up as the multilayer microporous membrane or film;
(e) having or exhibiting reduced high temperature shrinkage at 120° C. compared to a tri-layer microporous membrane having the same thickness, Gurley, porosity, and/or resin make-up as the multilayer microporous membrane or film;
(f) having at least one layer that comprises a polymer blend; and
(g) having a non-woven or woven attached to one or both sides of the multilayer microporous membrane or film, wherein the total thickness of the membrane or film is less than 30 microns, less than 25 microns, less than 20 microns, less than 15 microns, or less than 10 microns, wherein:
the multilayer microporous film comprises at least three layers that are all micro-layers (thickness of 1-10 microns), all nano-layers (thickness of less than 1 micron), or a combination of nano-layers and micro-layers;
the multilayer microporous film comprises at least four layers that are all micro-layers (thickness of 1-10 microns), all nano-layers (thickness of less than 1 micron), or a combination of nano-layers and micro-layers;
the multilayer microporous film comprises at least five layers that are all micro-layers (thickness of 1-10 microns), all nano-layers (thickness of less than 1 micron), or a combination of nano-layers and micro-layers; or
the multilayer microporous film comprises at least six layers that are all micro-layers (thickness of 1-10 microns), all nano-layers (thickness of less than 1 micron), or a combination of nano-layers and micro-layers.