	US 11,987,670 B2
	Polyimide film for graphite sheet having improved thermal conductivity, method for manufacturing same, and graphite sheet manufactured using same
Kyung Su Kim, Seoul (KR); Jeong Yeul Choi, Anyang-Si (KR); and Dong Young Won, Seoul (KR)
Assigned to PI ADVANCED MATERIALS CO., LTD., Chungcheongbuk-do (KR)
Appl. No. 16/975,734
Filed by PI ADVANCED MATERIALS CO., LTD., Chungcheongbuk-do (KR)
PCT Filed Jul. 20, 2018, PCT No. PCT/KR2018/008198 § 371(c)(1), (2) Date Aug. 26, 2020, PCT Pub. No. WO2019/164067, PCT Pub. Date Aug. 29, 2019.
Claims priority of application No. 10-2018-0023077 (KR), filed on Feb. 26, 2018.
Prior Publication US 2020/0407505 A1, Dec. 31, 2020
Int. Cl. C08G 73/10 (2006.01); B29C 41/00 (2006.01); B29C 41/46 (2006.01); C01B 32/205 (2017.01); C08J 5/18 (2006.01); C08K 3/32 (2006.01); C09K 5/14 (2006.01); H05K 7/20 (2006.01); B29K 79/00 (2006.01); B29K 509/02 (2006.01); B29L 7/00 (2006.01)

CPC C08G 73/1071 (2013.01) [B29C 41/003 (2013.01); B29C 41/46 (2013.01); C01B 32/205 (2017.08); C08J 5/18 (2013.01); C08K 3/32 (2013.01); C09K 5/14 (2013.01); H05K 7/2039 (2013.01); B29K 2079/08 (2013.01); B29K 2509/02 (2013.01); B29L 2007/008 (2013.01); C01P 2006/32 (2013.01); C08J 2379/08 (2013.01); C08K 2003/325 (2013.01)]

14 Claims

1. A method for manufacturing a polyimide film for graphite sheets, comprising:

mixing an organic solvent, a diamine monomer and a dianhydride monomer to prepare a polyamic acid solution;

adding a dehydration agent, an imidization agent and a catalyst to the polyamic acid solution to prepare a precursor composition;

forming a gel film by casting the precursor composition onto a support, followed by drying the precursor composition; and

imidizing the precursor composition through heat treatment of the gel film to form a polyimide film,

wherein the catalyst comprises a first catalyst having a linear structure and a second catalyst having a ring structure,

the second catalyst being present in an amount of 10 mol % to 30 mol % based on the total moles of the first catalyst and the second catalyst.