US 12,404,371 B2
Poly(amide-imide) copolymer, composition and polymer film comprising thereof
Tae Seob Lee, Daejeon (KR); Yoon Bin Lim, Daejeon (KR); Jae Gu Lim, Daejeon (KR); Seung Joon Lim, Daejeon (KR); Se Jeong Kim, Daejeon (KR); Woo Han Kim, Daejeon (KR); and Gieun Park, Daejeon (KR)
Assigned to LG CHEM, LTD., Seoul (KR)
Appl. No. 17/053,260
Filed by LG CHEM, LTD., Seoul (KR)
PCT Filed Jan. 9, 2020, PCT No. PCT/KR2020/000369
§ 371(c)(1), (2) Date Nov. 5, 2020,
PCT Pub. No. WO2020/145674, PCT Pub. Date Jul. 16, 2020.
Claims priority of application No. 10-2019-0003997 (KR), filed on Jan. 11, 2019; and application No. 10-2020-0002769 (KR), filed on Jan. 8, 2020.
Prior Publication US 2021/0246265 A1, Aug. 12, 2021
Int. Cl. C08G 73/14 (2006.01); C08F 290/14 (2006.01); C08G 73/10 (2006.01); C08G 73/12 (2006.01); C08J 5/18 (2006.01)
CPC C08G 73/14 (2013.01) [C08F 290/145 (2013.01); C08G 73/1039 (2013.01); C08G 73/1042 (2013.01); C08G 73/12 (2013.01); C08G 73/123 (2013.01); C08G 73/126 (2013.01); C08J 5/18 (2013.01); C08L 2203/16 (2013.01)] 13 Claims
 
1. A polymer film comprising a cured product of a poly(amide-imide) copolymer comprising imide repeating units and amide repeating units,
wherein at least one of the imide repeating units is substituted with a functional group including Chemical Formula 1 and at least one of the amide repeating units is substituted with a functional group including Chemical Formula 1,
wherein the imide and amide repeating units each substituted with a functional group including Chemical Formula 1 are contained in an amount of 5 to 40 parts by mol based on 100 parts by mol of the whole repeating units of the poly(amide-imide) copolymer, and
wherein the polymer film has a yellow index of 1.61 to 1.72 measured according to ASTM D1925 based on a thickness of 50±2 μm, a glass transition temperature of 185° C. to 193° C. measured using a TMA IC600 device, and a modulus of 4.08 GPa to 4.21 GPa measured using DMA 9800 based on a thickness of 50±2 μm:

OG Complex Work Unit Chemistry
wherein,
R1 is hydrogen or an alkyl group having 1 to 10 carbon atoms, and
L is a single bond or an alkylene having 1 to 10 carbon atoms.