US 12,214,541 B2
Drawability enhancement in polymer thin films
Arman Boromand, Issaquah, WA (US); Andrew John Ouderkirk, Kirkland, WA (US); Sheng Ye, Redmond, WA (US); and Christopher Yuan Ting Liao, Seattle, WA (US)
Assigned to Meta Platforms Technologies, LLC, Menlo Park, CA (US)
Filed by META PLATFORMS TECHNOLOGIES, LLC, Menlo Park, CA (US)
Filed on Apr. 27, 2022, as Appl. No. 17/730,371.
Claims priority of provisional application 63/286,431, filed on Dec. 6, 2021.
Prior Publication US 2023/0173741 A1, Jun. 8, 2023
Int. Cl. B29C 55/14 (2006.01); B29C 43/00 (2006.01); B29C 43/24 (2006.01); B29C 55/00 (2006.01); B29K 23/00 (2006.01); B29L 7/00 (2006.01)
CPC B29C 55/14 (2013.01) [B29C 43/003 (2013.01); B29C 43/24 (2013.01); B29C 55/005 (2013.01); B29K 2023/0658 (2013.01); B29L 2007/008 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A method comprising:
applying a first stress to a polymer thin film to stretch the polymer thin film along a first in-plane direction;
applying a second stress to the polymer thin film to stretch the polymer thin film along a second in-plane direction orthogonal to the first in-plane direction to form an anisotropic polymer thin film having an elastic modulus along at least one in-plane direction of at least approximately 30 GPa; and
feeding the anisotropic polymer thin film through a nip opening of a pair of counter-rotating calendar rollers to form a calendared polymer thin film, wherein the calendared polymer thin film comprises a void volume of less than approximately 25% and an average void size of less than approximately 100 nm.