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US 12,214,541 B2Granted
Drawability enhancement in polymer thin films
AssigneeMeta Platforms Technologies, LLC
InventorsArman Boromand, Andrew John Ouderkirk, Sheng Ye, Christopher Yuan Ting Liao
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Abstract
A method includes applying a stress to a polymer thin film to stretch the polymer thin film along a first in-plane direction, and subsequently applying a 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 ultra-high modulus polymer thin film. Calendaring or hot pressing of the ultra-high modulus polymer thin film may improve its optical and/or thermal properties.
Claims7
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.
1 more element
Dependencies are inferred from the claim text.