US 12,187,862 B2
Freestanding, dimensionally stable microporous webs
Richard W. Pekala, Corvallis, OR (US); Daniel K. Lee, Lebanon, OR (US); James E. Emanuel, Corvallis, OR (US); Robert Waterhouse, Lebanon, OR (US); Weston J. Wood, Lebanon, OR (US); and Andrew Wimer, Lebanon, OR (US)
Assigned to Amtek Research International LLC, Lebanon, OR (US)
Filed by AMTEK RESEARCH INTERNATIONAL LLC, Lebanon, OR (US)
Filed on Mar. 17, 2021, as Appl. No. 17/204,577.
Application 17/204,577 is a continuation of application No. 15/812,581, filed on Nov. 14, 2017, granted, now 10,975,208.
Application 15/812,581 is a continuation of application No. 14/775,604, granted, now 9,847,519, issued on Dec. 19, 2017, previously published as PCT/US2014/030683, filed on Mar. 17, 2014.
Claims priority of provisional application 61/864,448, filed on Aug. 9, 2013.
Claims priority of provisional application 61/801,376, filed on Mar. 15, 2013.
Prior Publication US 2021/0309815 A1, Oct. 7, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. C08J 5/18 (2006.01); C08J 7/04 (2020.01); C08J 7/043 (2020.01); H01M 10/0525 (2010.01); H01M 50/406 (2021.01); H01M 50/417 (2021.01); H01M 50/431 (2021.01); H01M 50/446 (2021.01); H01M 50/449 (2021.01); H01M 50/489 (2021.01)
CPC C08J 5/18 (2013.01) [C08J 7/0423 (2020.01); C08J 7/043 (2020.01); H01M 50/406 (2021.01); H01M 50/417 (2021.01); H01M 50/431 (2021.01); H01M 50/446 (2021.01); H01M 50/449 (2021.01); H01M 50/489 (2021.01); C08J 2323/06 (2013.01); C08J 2409/04 (2013.01); H01M 10/0525 (2013.01); Y10T 428/249955 (2015.04); Y10T 428/249958 (2015.04); Y10T 428/249962 (2015.04)] 18 Claims
OG exemplary drawing
 
1. A freestanding polyolefin web, comprising:
a microporous polyolefin membrane having a first major surface, a second major surface opposite the first major surface, and a bulk structure; and
a porous inorganic surface layer comprising fumed inorganic particles and an inorganic acid, wherein the porous inorganic surface layer covers at least a portion of the first major surface and at least a portion of the second major surface of the polyolefin membrane, wherein the fumed inorganic particles form an aggregated network of open chain shaped morphology, the inorganic particles held together by hydrogen bonding provided by the inorganic acid at particle-to-particle contacts, the inorganic acid comprising at least one of phosphoric acid (H3PO4), boric acid (H3BO3), tetraboric acid (H2B4O7), vanadic acid (HVO3), or molybdic acid (H2MoO4);
wherein the inorganic particles are independently selected from a group consisting of silica, alumina, titania, zirconia, and combinations thereof; and
wherein the polyolefin web exhibits in-plane dimensional stability above the melting point of the polyolefin membrane.