US 12,404,370 B2
Method for producing polyimide film and polyimide film manufactured thereby
Dong Young Kim, Chungcheongbuk-do (KR); Dong Young Won, Chungcheongbuk-do (KR); and Jeong Yeul Choi, Chungcheongbuk-do (KR)
Assigned to PI Advanced Materials Co., Ltd., Chungcheongbuk-do (KR)
Appl. No. 17/609,565
Filed by PI Advanced Materials Co., Ltd., Chungcheongbuk-do (KR)
PCT Filed Oct. 29, 2019, PCT No. PCT/KR2019/014398
§ 371(c)(1), (2) Date Nov. 8, 2021,
PCT Pub. No. WO2020/226243, PCT Pub. Date Nov. 12, 2020.
Claims priority of application No. 10-2019-0053583 (KR), filed on May 8, 2019.
Prior Publication US 2022/0411585 A1, Dec. 29, 2022
Int. Cl. C08G 73/10 (2006.01); C08J 5/18 (2006.01); C08K 5/09 (2006.01)
CPC C08G 73/1067 (2013.01) [C08G 73/1021 (2013.01); C08J 5/18 (2013.01); C08K 5/09 (2013.01); C08J 2379/08 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method for manufacturing a polyimide film, comprising:
preparing a polyamic acid by polymerizing a mixture containing an aromatic diamine and an aromatic acid dianhydride;
preparing a first composition containing the polyamic acid, an amine-based catalyst, an acid anhydride-based dehydrating agent, and a solvent; and
forming a polyimide film at 150° C. or less using the first composition,
wherein the aromatic diamine includes 4,4′-oxydianiline and p-phenylenediamine,
wherein the aromatic acid dianhydride includes pyromellitic dianhydride (PMDA) and 3,4,3′,4′-biphenyltetracarboxylic dianhydride (BPDA),
wherein the amine-based catalyst includes isoquinoline,
wherein the first composition contains 100 parts by weight of polyamic acid, 5 to 25 parts by weight of an amine-based catalyst, 8 to 50 parts by weight of an acid anhydride-based dehydrating agent, and 30 to 200 parts by weight of a solvent,
wherein the first composition contains the amine-based catalyst and the acid anhydride-based dehydrating agent in a molar ratio of 1:2 to 1:5.