US 12,264,231 B2
Polyamide-imide film
Sangyoon Park, Daejeon (KR); Hye Ri Kim, Daejeon (KR); Hyejin Kim, Daejeon (KR); Seungmin Jeon, Daejeon (KR); and Jisang Jeong, Daejeon (KR)
Assigned to SK Innovation Co., Ltd., Seoul (KR); and SK ic technology Co., Ltd., Seoul (KR)
Appl. No. 17/614,624
Filed by SK Innovation Co., Ltd., Seoul (KR); and SK ie technology Co., Ltd., Seoul (KR)
PCT Filed May 29, 2020, PCT No. PCT/KR2020/006976
§ 371(c)(1), (2) Date Nov. 29, 2021,
PCT Pub. No. WO2020/242242, PCT Pub. Date Dec. 3, 2020.
Claims priority of application No. 10-2019-0064960 (KR), filed on May 31, 2019; and application No. 10-2020-0064333 (KR), filed on May 28, 2020.
Prior Publication US 2022/0227964 A1, Jul. 21, 2022
Int. Cl. C08K 5/3472 (2006.01); C08G 73/10 (2006.01)
CPC C08K 5/3472 (2013.01) [C08G 73/1007 (2013.01)] 12 Claims
 
1. A polyamide-imide film comprising: a polyamide-imide resin and a porphyrin-based dye,
the polyamide-imide film having a yellow index (YI) of 2 or less and ΔYIheat of 0.1 or less,
wherein ΔYIheat is, when a heat resistance test is performed, a yellow index change value of the polyamide-imide film before and after the heat resistance test, in which in one cycle, the polyamide-imide film is allowed to stand at 80° C. for 2 hours and then to stand at 25° C. for 2 hours, and 200 cycles are carried out repeatedly,
wherein the polyamide-imide resin is a copolymerized product of an aromatic diamine, a dianhydride, and an aromatic dicarboxylic dichloride, and
wherein the aromatic diamine includes 2,2′-bis(trifluoromethyl)-benzidine.