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

Claim 3:
4. 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 membrane or film has or exhibits 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, wherein:
the membrane or film may have a high temperature shrinkage at 120° C. that is 30 to 75% lower, 35 to 70% lower, 35 to 65% lower, or 40 to 60% lower, 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.