US 12,065,551 B2
Consolidated polymer film
Leopoldo Alejandro Carbajal, Newark, DE (US); Mark Allan Lamontia, Landenberg, PA (US); Ross S Johnson, Wilmington, DE (US); Kostantinos Kourtakis, Media, PA (US); Aref Samadidooki, Wilmington, DE (US); Mobin Yahyazadehfar, Garnet Valley, PA (US); and Heidi Elizabeth Burch, Bear, DE (US)
Assigned to DUPONT ELECTRONICS, INC., Wilmington, DE (US)
Filed by DUPONT ELECTRONICS, INC., Wilmington, DE (US)
Filed on Oct. 4, 2021, as Appl. No. 17/493,319.
Claims priority of provisional application 63/087,572, filed on Oct. 5, 2020.
Prior Publication US 2022/0106451 A1, Apr. 7, 2022
Int. Cl. B32B 27/28 (2006.01); B29C 65/00 (2006.01); B29K 79/00 (2006.01); B32B 3/02 (2006.01); C08J 5/18 (2006.01); C08J 7/04 (2020.01)
CPC C08J 5/18 (2013.01) [B29C 66/43 (2013.01); B29C 66/712 (2013.01); B32B 3/02 (2013.01); B32B 27/281 (2013.01); C08J 7/042 (2013.01); B29C 66/7315 (2013.01); B29C 66/73365 (2013.01); B29C 66/7394 (2013.01); B29K 2079/08 (2013.01); B29K 2079/085 (2013.01); B32B 2250/24 (2013.01); B32B 2307/412 (2013.01); B32B 2307/51 (2013.01); B32B 2307/54 (2013.01); B32B 2457/20 (2013.01); C08J 2379/08 (2013.01); Y10T 428/192 (2015.01)] 15 Claims
 
1. A consolidated polymer film comprising:
a first polymer layer having a first elastic modulus, wherein the first polymer layer comprises a non-melt-processible polymer comprising a polyimide, a poly(amide-imide), a block copolymer of a polyimide or a poly(amide-imide) or a mixture thereof; and
a second polymer layer having a second elastic modulus, wherein the second polymer layer comprises a polyimide, a poly(amide-imide), a block copolymer of a polyimide or a poly(amide-imide) or a mixture thereof, wherein:
a minor surface of the first polymer layer is in contact with a minor surface of the second polymer layer;
the first elastic modulus is different from the second elastic modulus;
the first and second polymer layers are bonded by consolidation; the first and second polymer layers each have a transmittance of greater than 60% in the visible range; and the consolidated polymer film has a b* color of 2 or less for a film thickness of 50 μm or less.
 
14. A consolidated polymer film comprising:
a first polymer layer having a first yield strength, wherein the first polymer layer comprises a non-melt-processible polymer comprising a polyimide, a poly(amide-imide), a block copolymer of a polyimide or a poly(amide-imide) or a mixture thereof; and
a second polymer layer having a second yield strength, wherein the second polymer layer comprises a polyimide, a poly(amide-imide), a block copolymer of a polyimide or a poly(amide-imide) or a mixture thereof, wherein:
a minor surface of the first polymer layer is in contact with a minor surface of the second polymer layer;
the first yield strength is different from the second yield strength;
the first and second polymer layers are bonded by consolidation; the first and second polymer layers each have a transmittance of greater than 60% in the visible range; and the consolidated polymer film has a b* color of 2 or less for a film thickness of 50 μm or less.